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WO2021250768A1 - Dispositif de prévention des vibrations pour balai d'essuie-glace et balai d'essuie-glace - Google Patents

Dispositif de prévention des vibrations pour balai d'essuie-glace et balai d'essuie-glace Download PDF

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Publication number
WO2021250768A1
WO2021250768A1 PCT/JP2020/022640 JP2020022640W WO2021250768A1 WO 2021250768 A1 WO2021250768 A1 WO 2021250768A1 JP 2020022640 W JP2020022640 W JP 2020022640W WO 2021250768 A1 WO2021250768 A1 WO 2021250768A1
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WO
WIPO (PCT)
Prior art keywords
vibration
prevention device
wiper blade
wiper
vibration prevention
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/022640
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English (en)
Japanese (ja)
Inventor
博之 中野
良 兼山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fukoku Co Ltd
Original Assignee
Fukoku Co Ltd
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Filing date
Publication date
Application filed by Fukoku Co Ltd filed Critical Fukoku Co Ltd
Priority to PCT/JP2020/022640 priority Critical patent/WO2021250768A1/fr
Publication of WO2021250768A1 publication Critical patent/WO2021250768A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
    • B60S1/38—Wiper blades
    • B60S1/3848—Flat-type wiper blade, i.e. without harness
    • B60S1/3886—End caps
    • B60S1/3894—End caps having a particular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/04—Wipers or the like, e.g. scrapers
    • B60S1/0491—Additional elements being fixed on wipers or parts of wipers not otherwise provided for, e.g. covers, antennae or lights

Definitions

  • the present invention relates to a vibration prevention device for preventing vibration generated in a wiper and a wiper blade provided with such a vibration prevention device.
  • the wiper is provided, for example, to remove raindrops adhering to the front windshield of an automobile.
  • the wiper blade needs to move along the surface of the windshield at a uniform speed while the wiper rubber of the wiper blade touches the outer surface of the windshield.
  • the wiper blade does not move at a uniform speed, and a phenomenon called chatter vibration may occur, for example, as if it were caught on the surface of the windshield and moved.
  • the chatter vibration is due to the stick-slip phenomenon, and when the chatter vibration occurs, the wiper blade appears to bounce when observed from the passenger compartment side, which hinders the driving of the vehicle.
  • chatter vibration occurs, the moving speed of the wiper blade in the in-plane direction of the windshield changes little by little, so if the vehicle is running in the rain, the wiper will be on the surface of the windshield.
  • chatter vibration becomes even greater and the wiper blade jumps, water droplets are left unwiped, increasing the front view of the driver while driving. Hinder.
  • chatter vibration occurs, rattling noise is generated, which is very jarring.
  • the system chatter vibration in which the two wiper arms vibrate in opposite phases and the wiper blade for each wiper are attached to the wiper arm as chatter vibration, as described later.
  • chatter vibration There is yawing chatter vibration that yaws in the direction of movement of the wiper blade around the fixed position.
  • the wiper blades have been used for the purpose of obscuring the wiper from the vehicle interior to expand the field of view and reducing the front projection area of the wiper blade in the vehicle traveling direction to reduce air resistance during high-speed driving. Attempts have been made to lower the overall height.
  • the total height of the wiper blade is the dimension of the wiper blade in the direction perpendicular to the surface of the windshield.
  • the mass of the wiper blade is, for example, halved compared to the conventional product.
  • chatter vibration is likely to occur.
  • the surface of the windshield is treated with a water-repellent coating, water lubrication is hindered and frictional resistance increases, which also causes chatter vibration.
  • Patent Document 1 discloses that a device combining a weight and a viscoelastic body that causes damping is attached to a wiper blade, and the weight vibrates when chatter vibration occurs to absorb the chatter vibration of the wiper.
  • Patent Document 2 discloses that a weight is arranged by insert molding inside a resin cap provided at the tip of the wiper blade, and chatter vibration is suppressed by increasing the inertia of the wiper blade due to the provision of the weight. There is.
  • An object of the present invention is to provide a vibration prevention device capable of simultaneously and efficiently suppressing system chatter vibration and yawing chatter vibration in a wiper, and a wiper blade provided with such a vibration prevention device.
  • the vibration prevention device of the present invention is a vibration prevention device attached to a wiper blade to prevent vibration of the wiper, and has a loss coefficient of 0.1 or more and 0.6 or less, and a mass covered with a rubber member and a rubber member. It has a dynamic absorber integrated with the body, and the resonance frequency of the natural vibration of the dynamic absorber along the moving direction of the wiper blade is 5 Hz or more and less than 20 Hz.
  • the wiper blade of the present invention includes the vibration prevention device of the present invention.
  • system chatter vibration and yawing chatter vibration in the wiper can be suppressed simultaneously and efficiently, and a wiper blade without unwiped water droplets or generation of abnormal noise can be realized.
  • FIG. It is a top view which shows the vibration prevention device of the modification 2.
  • FIG. It is sectional drawing which shows the vibration prevention device of the modification 2.
  • FIG. It is a perspective view explaining the assembly of the vibration prevention device of the modification 5.
  • FIG. 1 is a diagram showing a configuration of a wiper, and schematically shows a state in which the front windshield (windshield) 10 of a right-hand drive vehicle is viewed from the front outside the vehicle.
  • "Dr” indicates that it is on the driver's seat side
  • "Pa” indicates that it is on the passenger seat side.
  • the wiper 20 and the like are arranged symmetrically to those shown in FIG.
  • two wipers 20 are provided so as to wipe off raindrops and the like adhering to the front windshield 10 of the vehicle.
  • the wiper 20 is driven from the motor 24 via the link mechanism 23 to perform a reciprocating swing motion within a predetermined wiper wiping angle, and is fixed to the tip of the wiper arm 21 and is actually a front windscreen. It is composed of a wiper blade 22 that slides on the surface of 10 to remove raindrops and the like.
  • the regions with halftone dots are regions to which raindrops and the like adhere.
  • the white area surrounded by the halftone dot area is the area where the raindrops are wiped off and removed by the operation of the two wipers 20.
  • the tip T of the wiper blade 22 means the end of the two ends in the longitudinal direction of the wiper blade 22 that is far from the center of rotation when the wiper 20 swings back and forth. On the other hand, of the ends of the wiper blade 22, the end closer to the center of rotation is the rear end B.
  • wiper blades for vehicles such as tournament type, design blade type, and flat plate type, depending on the structure for correctly contacting the wiper rubber with the windshield.
  • the mass of the tournament type is about 230 g as an example
  • the mass of the design blade type is slightly lighter than that, about 210 g as an example.
  • the mass of the flat blade type wiper blade having a low overall height is, for example, about 120 g to 150 g.
  • FIG. 2A is a diagram illustrating system chatter vibration when the front windshield 10 is viewed from the front outside the vehicle.
  • the wiper arm 21 on the driver's seat (Dr) side and the wiper arm 21 on the passenger's seat (Pa) side vibrate in opposite phases with respect to the two wipers 20 driven by the same motor 24.
  • the broken line indicates the position of the wiper arm 21 and the wiper blade 22 displaced by the system chatter vibration.
  • the solid line shows the original positions of the wiper arm 21 and the wiper blade 22 when there is no system chatter vibration.
  • the arrows indicate the amplitude of the system chatter vibration.
  • the present inventors observed the position of the tip T of the wiper blade 22 while operating the wiper 20 to which the flat blade type wiper blade 22 is attached, and observed the position of the tip T of the wiper blade 22 from the position when there was no system chatter vibration.
  • the time change of the displacement of the wiper blade 22 along the original moving direction was investigated. The results are shown in FIG. 2B. It was found that the time difference between the peaks of two adjacent displacements in the same direction was about 0.1 seconds and the vibration frequency of the system chatter vibration was around about 10 Hz.
  • FIG. 3A is a diagram illustrating yawing chatter vibration when the front windshield is viewed from the front outside the vehicle.
  • the wiper blade 22 performs a yawing motion in the moving direction of the wiper blade 22 around a position fixed to the wiper arm 21 for each wiper 20.
  • the broken line indicates the position of the wiper blade 22 displaced by the yawing chatter vibration.
  • the solid line shows the original position of the wiper blade 22 when there is no yawing chatter vibration.
  • the arrow indicates the amplitude of yawing chatter vibration.
  • the present inventors observed the position of the rear end B of the flat blade type wiper blade 22 while operating the wiper 20, and the original position of the wiper blade 22 from the position when there was no yawing chatter vibration.
  • the time change of the displacement along the moving direction was investigated. The results are shown in FIG. 3B. It was found that the time difference between the peaks of two adjacent displacements in the same direction was about 0.067 seconds, and the vibration frequency of the yawing chatter vibration was around about 15 Hz.
  • a vibration prevention device equipped with a dynamic absorber consisting of a rubber member having high vibration damping performance and a mass body arranged inside the rubber member is attached to the wiper blade 22 to cause system chatter vibration and yawing. It has been shown that both chatter vibrations may be suppressed.
  • the mass body is generally a weight made of a rigid substance such as metal.
  • the dynamic absorber has a structure in which a rubber member and a weight covered with the rubber member are integrated, and is attached to the tip T of the flat blade type wiper blade 22.
  • the dynamic absorber has a main body portion provided with a weight, a mounting portion that is a mounting position for the wiper blade 22, and a constricted connecting portion that connects the main body portion and the mounting portion, as a whole. It is assumed that it is formed by integrally molding a rubber member. Model shown in FIG.
  • the mass m 2 is a model of a dynamic absorber. In the simulation, the mass of the weight of the dynamic absorber is the mass m 2 , the spring coefficient of the connecting part is the spring coefficient k 2, and the loss coefficient of the rubber member is lost. The coefficient c 1 was used. The value of the spring constant k 2 was 135 N / m.
  • the rubber member is composed of rubber which is a viscoelastic body
  • the real part of the complex elastic modulus of the rubber constituting the rubber member is the storage elastic modulus
  • the imaginary part is the loss elastic modulus.
  • the ratio of the loss elastic modulus to the rate is defined as the loss coefficient of the rubber member. This loss factor is also commonly expressed as tan ⁇ .
  • the frequency of the natural vibration of the dynamic absorber in the direction along the moving direction of the wiper blade 22 when the wiper 20 is operating normally is called a resonance frequency (or natural frequency).
  • the system chatter vibration is vibration centered on the base of the wiper arm 21, that is, the end of the wiper 20 to which the wiper blade 22 is not connected. Therefore, in the simulation of system chatter vibration, the total mass of the wiper arm 21 and the wiper blade 22 is the mass m 1 in the model, the spring constant of the wiper arm 21 and the wiper blade 22 is k 1, and the wiper arm 21 and the wiper blade 22 are used.
  • the loss coefficient including 22 was set to c 1, and the change in the vibration transmission rate when the mass m 2 of the weight was changed was investigated.
  • the loss coefficient c 2 of the rubber member is fixed at 0.3, the spring constant k 2 is changed so that the resonance frequency f of the dynamic absorber is 10 Hz, and the dynamic absorber is attached to the tip T of the wiper blade 22.
  • a simulation was performed as if it were.
  • the vibration transmission coefficient indicates how much the vibration applied to the wiper arm 21 is amplified at the tip T of the wiper blade 22, and here, the maximum vibration transmission coefficient is obtained. Table 1 shows the specific conditions used in the simulation.
  • the yawing chatter vibration is the yaw vibration of the wiper blade 22 centered on the attachment position to the wiper arm 21. Therefore, in the simulation of the yawing chatter vibration, the mass of the wiper blade 22 is the mass m 1 and the spring constant of the wiper blade 22.
  • the loss coefficient of the wiper blade 22 was set to c 1, and the change in the vibration transmission rate when the mass m 2 of the weight was changed was investigated.
  • the loss coefficient c 2 of the rubber member is fixed at 0.3, the spring constant k 2 is changed so that the resonance frequency f of the dynamic absorber is 15 Hz, and the dynamic absorber is attached to the rear end B of the wiper blade 22.
  • a simulation was performed as if it had been done.
  • the vibration transmission rate for yawing chatter vibration indicates how much the vibration applied to the mounting position of the wiper blade 22 to the wiper arm 21 is amplified at the rear end B of the wiper blade 22, and here, the maximum vibration transmission rate. Asked. Table 1 shows the specific conditions used in the simulation.
  • FIG. 5 shows the simulation result on the influence of the weight mass m 2 on the damping of the system chatter vibration
  • FIG. 6 shows the simulation result on the influence of the weight mass m 2 on the damping of the yawing chatter vibration.
  • the above simulation results are based on the assumption that the wiper blade 22 is a flat blade type and its mass is 120 g.
  • the simulation results show that it is preferable to increase the mass of the weight, but if the mass of the weight is too large, the mass of the wiper blade 22 including the mass of the weight becomes too large, and the wiper blade 22 becomes too large.
  • the overrun of the wiper blade 22 refers to a phenomenon in which the wiping angle of the wiper 20 becomes larger than the specified angle range.
  • the wiper blade 22 may interfere with the window frame of the vehicle, and there is a concern that the paint may be peeled off or the wiper blade 22 may be damaged.
  • the mass of the tournament type wiper blade is, for example, 230 g, 60 g, which is about 60% of the mass difference between the tournament type wiper blade and the flat blade type wiper blade, is the upper limit of the mass m 2 of the weight. Conceivable.
  • the lower limit of the mass m 2 of the weight is 5 g. From FIGS. 5 and 6, the mass m 2 of the weight is more preferably 10 g or more and 20 g or less.
  • the maximum vibration transmission coefficient for system chatter vibration can be reduced to about 1/7 of the case where the loss coefficient is 0. I understood. Further, from FIG. 8, by setting the loss coefficient (tan ⁇ ) of the rubber member to 0.1 or more, the maximum vibration transmission coefficient with respect to yawing chatter vibration is reduced to about 1/7 of the case where the loss coefficient is 0. I found that I could do it. In both FIGS. 7 and 8, the vibration reducing effect gradually decreased as the loss coefficient increased. For this reason, it is preferable to set the upper limit of the loss coefficient of the rubber member to 0.6. Further, the loss coefficient of the rubber member is more preferably 0.2 or more and 0.4 or less. This is because, as can be seen from FIGS. 7 and 8, both system chatter vibration and yawing chatter vibration can be minimized.
  • a dynamic absorber having a rubber member having a loss coefficient of 0.1 or more and 0.6 or less, and a weight, that is, a mass body covered with the rubber member, and is a wiper blade during normal operation of the wiper.
  • the system chatter vibration in the wiper by attaching a vibration inhibitor with a dynamic absorber that has a vibration absorber whose natural frequency (that is, resonance frequency) of vibration in the direction of movement is close to the frequency of the wiper system chatter vibration or yawing chatter vibration. It was found that both the yawing chatter vibration and the yawing chatter vibration can be effectively reduced.
  • the vibration damping device based on the present invention is a vibration damping device that can be attached to the wiper blade, and has a rubber member having a loss coefficient of 0.1 or more and 0.6 or less, and a weight or mass body covered with the rubber member. It is characterized in that the vibration frequency of the natural vibration of the dynamic absorber with respect to the moving direction of the wiper blade during the normal operation of the wiper is 5 Hz or more and less than 20 Hz.
  • a rubber member having a loss coefficient (tan ⁇ ) of 0.1 or more and 0.6 or less is used.
  • loss coefficient 0.1 or more and 0.6 or less
  • Carbon black is a reinforcing material most often used to reinforce rubber, and strong reinforcement is exhibited by strongly restraining rubber molecules on the surface of carbon black particles. When this constrained, hard-to-move rubber molecule tries to move, energy is consumed and viscosity develops. The stronger the reinforcement of the carbon black, that is, the larger the specific surface area of the carbon black, or the larger the amount of the carbon black added to the rubber, the larger the loss coefficient of the rubber material.
  • the specific surface area of carbon black increases as the particle size of carbon black decreases.
  • As a method for determining the specific surface area of carbine black there is a known method based on measuring the amount of iodine adsorbed or the amount of nitrogen adsorbed.
  • a polymer having a large side chain Rubber is formed from a polymer, and its properties depend on the structure of the molecule in the repeating unit constituting the polymer.
  • a small polymer having few side chains such as butadiene rubber (BR)
  • BR butadiene rubber
  • the movement of the molecule is not suppressed, so that the molecular motion is not hindered and the loss coefficient becomes small.
  • a polymer having a large side chain such as styrene-butadiene copolymer (SBR) or butyl rubber (IIR) is used, the movement is suppressed by the side chain, so that the molecular motion is inhibited and the loss coefficient is increased. growing.
  • the rubber member that achieves the above range is a raw material rubber mixed with a reinforcing material such as carbon black.
  • a reinforcing material such as carbon black.
  • the amount of iodine adsorbed is 70 mg / g to 86 mg / g
  • the amount of DBP (dibutyl phthalate) adsorbed is 75 to 100 mL / 100 g). It is preferable to form the rubber member from a rubber material containing 40 to 120 parts by mass of (high wear resistance) type carbon black.
  • a rubber softener for example, a rubber softener, a vulcanization accelerator, a processing aid, an antiaging agent, a vulcanization accelerator and the like may be added to the raw rubber as a rubber compounding agent.
  • the vulcanization temperature at the time of molding the rubber member is preferably 160 ° C. or higher.
  • natural rubber NR
  • ethylene- ⁇ -olefin copolymer EPM or EPDM
  • SBR styrene-butadiene copolymer
  • NBR acrylonitrile-butadiene copolymer
  • CSM Polyethylene rubber
  • H-NBR hydrogenated acrylonitrile-butadiene copolymer
  • ACM acrylic acid alkyl ester-2-chloroethyl vinyl ether copolymer
  • ACM acrylic acid alkyl ester-acrylonitrile copolymer
  • Silicone rubber fluororubber, etc.
  • carbon black in addition to the HAF type, for example, SAF (super wear resistance), ISAF (quasi-super wear resistance), MAF (medium wear resistance), FEF (good extrusion), SRF (medium).
  • HAF super wear resistance
  • ISAF quadsi-super wear resistance
  • MAF medium wear resistance
  • FEF good extrusion
  • SRF moderate wear resistance
  • GPF general purpose
  • FT fine pyrolysis
  • MT fine pyrolysis
  • a single type of carbon black may be blended in the raw rubber, or a plurality of types of carbon black may be mixed and blended.
  • FIG. 9A is a perspective view showing the configuration of the vibration prevention device 30 according to the embodiment of the present invention and the assembly process thereof
  • FIG. 9B is a center line extending in the length direction of the vibration prevention device 30 shown in FIG. 9A. It is a cross-sectional view along.
  • FIG. 9B which is a cross-sectional view, the region represented by the hatch with the reference numeral R indicates that the region is formed of a rubber member.
  • a rubber member having a loss coefficient of 0.1 or more and 0.6 or less and a mass body covered with the rubber member are integrated into a dynamic absorber, and this dynamic absorption is performed.
  • a vibration prevention device including a device By attaching a vibration prevention device including a device to the wiper blade 22, both the system chatter vibration and the yawing chatter vibration of the wiper 20 can be reduced if the resonance frequency of the natural vibration of the dynamic absorber is 5 Hz or more and less than 20.
  • the vibration prevention device 30 of the present embodiment has a structure in which the dynamic absorber 40 is attached to the pedestal 60.
  • the dynamic absorber 40 is attached to the pedestal 60.
  • the pedestal 60 is fixed to the wiper blade 22.
  • the dynamic absorber 40 has a structure in which a rubber member and a weight 50 covered with the rubber member are integrated, and has a main body portion 41 having the weight 50, a mounting position to the pedestal 60, and a mounting portion 43. It has a constricted connecting portion 42 that connects the main body portion 41 and the mounting portion 43.
  • the main body portion 41, the connecting portion 42, and the mounting portion 43 are formed by integrally molding a rubber member having a loss coefficient of 0.1 or more and 0.6 or less.
  • the direction from the main body 41 to the mounting portion 43 via the connecting portion 42 is the length direction of the dynamic absorber 40, and is the direction perpendicular to the length direction when the vibration prevention device 30 is mounted on the wiper blade 22.
  • the width direction of the dynamic absorber 40 is the direction facing the moving direction of the wiper blade 22 that is normally operating, for example, the direction parallel to the moving direction.
  • the direction orthogonal to both the length direction and the width direction is called the thickness direction of the dynamic absorber 40.
  • the connecting portion 42 is a region having a narrower width than either the main body portion 41 or the mounting portion 43.
  • the pedestal 60 is formed of, for example, metal or a resin that is harder than rubber, and has a shape extending in the length direction of the dynamic absorber 40.
  • a pair of claws 61 are provided so as to face each other at one end of the pedestal 60 in the length direction.
  • a pair of notches 44 are provided in the mounting portion 43 of the dynamic absorber 40 so as to correspond to the claw 61, and the notch 44 is provided with a step portion 45 capable of engaging with the tip 62 of the claw 61. Therefore, after placing the pedestal 60 on a horizontal plane so that the claws 61 face upward, the pair of claws 61 of the pedestal 60 and the pair of notches 44 of the mounting portion 43 are aligned, and the mounting portion 43 is aligned in the thickness direction thereof.
  • the dynamic absorber 40 is attached to the pedestal 60 so as not to be easily detached, and the vibration prevention device 30 is completed.
  • the main body portion 41 and the connecting portion 42 face the pedestal 60 so as to form a gap between the main body portion 41 and the connecting portion 42. Since the pedestal 60 also has a function of preventing the main body 41 and the connecting portion 42 from coming into contact with the wiper blade 22, the main body 41 and the connecting portion 42 are pedestals when viewed from below in the thickness direction of the dynamic absorber 40. It has a shape that is hidden by the 60 and cannot be seen.
  • the dynamic absorber 40 has a structure in which the main body 41 including the weight 50 is connected to the mounting portion 43 fixed to the pedestal 60 via a connecting portion 42 which is narrower than the main body 41. Have. As a result, the main body 41 has a natural vibration mode in which the main body 41 swings in the width direction around the mounting portion 43.
  • the resonance frequency of this natural vibration mainly depends on the spring constant of the connecting portion 42 formed by the rubber member and the mass of the weight 50.
  • the resonance frequency is 5 Hz or more and less than 20 Hz in order to reduce both the system chatter vibration and the yawing chatter vibration of the wiper 20.
  • the material of the rubber member constituting the dynamic absorber 40, the shape of the connecting portion 42, the mass of the weight 50, and the like are selected.
  • the vibration prevention device 30 is attached to the wiper blade 22 via the pedestal 60 of the vibration prevention device 30 so that the length direction of the dynamic absorber 40 coincides with the length direction of the wiper blade 22.
  • the mounting position of the vibration prevention device 30 on the wiper blade 22 is not particularly limited, but since the vibration prevention device 30 suppresses chatter vibration, the wiper blade 22 vibrates where the amplitude of the chatter vibration is large. It is preferable to attach the prevention device 30. Therefore, it is preferable to attach the vibration prevention device 30 to either one or both of the front end T and the rear end B of the wiper blade 22.
  • FIG. 10 shows an example in which the vibration prevention device 30 is attached to the tip T of the wiper blade 22
  • FIG. 11 shows an example in which the vibration prevention device 30 is attached to both the tip T and the rear end B of the wiper blade 22.
  • the wiper arm 21 to which the wiper blade 22 is attached is not shown, but the mounting bracket 25 which is the attachment position to the wiper arm 21 is shown.
  • the weight 50 and the rubber member are integrated by setting the weight 50 having a mass of 15 g in the mold and transferring the rubber material having a loss coefficient of 0.3.
  • the dynamic absorber 40 shown in FIGS. 9A and 9B was manufactured.
  • the rubber material used was a mixture of 120 parts by mass of carbon black (HAF) and the above-mentioned rubber compounding agent with respect to 100 parts by mass of EPDM.
  • the vulcanization temperature at the time of molding may be 160 ° C. or higher. After that, the dynamic absorber 40 was attached to the pedestal 60 to complete the vibration prevention device 30.
  • vibration prevention device 30 having a resonance frequency of 10 Hz for attaching to the tip T of the wiper blade 22, and a vibration prevention device 30 having a resonance frequency of 15 Hz for attaching to the rear end B of the wiper blade 22.
  • the vibration prevention device 30 of the above was manufactured.
  • the case where the prevention device 30 was attached was defined as "attached state 2", and the amplitude of the chatter vibration was measured in both of these cases.
  • the water-repellent coating treatment of the front windshield 10 was performed using a commercially available water-repellent coating agent for glass, and the friction-reducing coating was removed from the wiper rubber, thereby intentionally increasing the friction load and chattering. The conditions were set so that vibration was likely to occur.
  • the friction coefficient ⁇ of the wiper rubber was 2.0.
  • the passenger car used in the test adopted a wiper system that can change the operating speed of the wiper 20 in a plurality of stages of, for example, "High” and “Low”.
  • the wiper system is operated at the lowest speed, that is, “Low” using the voltage (12.5 to 14V) supplied from the vehicle battery, and the wiper blade 22 of the wiper 20 on the driver's side at that time is operated.
  • the vibration acceleration of the front end T and the rear end B was measured by a vibration pickup.
  • the amplitude of the chatter vibration was obtained by converting the output of the vibration pickup into an amplitude with a charge amplifier (charge amplifier).
  • FIGS. 12 and 13 show the amplitude at the tip T of the wiper blade 22, and FIG. 13 shows the amplitude at the rear end B of the wiper blade 22.
  • the "conventional product" shows the measurement result when the vibration prevention device 30 is not attached to the wiper blade 22.
  • the chatter vibration at the tip T of the wiper blade 22 is about 1 as compared with the case where the anti-vibration device 30 is not attached. It was possible to reduce it to 1/10. Further, as shown in FIGS.
  • the vibration prevention device according to the embodiment of the present invention has been described above, the vibration prevention device based on the present invention is not limited to the above-mentioned one, and various modifications can be made. Hereinafter, a typical modification will be described.
  • FIG. 14A and 14B are perspective views and plan views showing the vibration prevention device of Modification 1, respectively, and FIG. 14C is a cross-sectional view taken along the line CC of FIG. 14B.
  • the vibration prevention device based on the present invention can absorb vibration because the main body 41 including the weight 50 in the dynamic absorber 40 is the dynamic absorber with respect to the mounting portion 43 and therefore the pedestal 60, as shown by the arrow V in FIG. 14B. This is because it swings in the width direction of 40. If the vibration of the main body 41 is hindered, a sufficient vibration absorption effect cannot be obtained.
  • the main body 41 is separated from the pedestal 60, but the main body 41 may come into contact with the pedestal 60 due to a disturbance applied to a moving vehicle or the like. Therefore, in the vibration prevention device of the first modification, in order to reduce the frictional load when the main body 41 of the dynamic absorber 40 comes into contact with the pedestal 60, a protrusion 64 is provided on the surface of the pedestal 60 facing the main body 41. There is.
  • One protrusion 64 is provided on the pedestal 60, for example, corresponding to one point on the center line extending in the length direction of the dynamic absorber 40.
  • the vibration prevention device even if the main body 41 comes into contact with the pedestal 60, the only portion of the pedestal 60 that comes into contact with the main body 41 is the protrusion 64, and the contact area between the pedestal 60 and the main body 41 is increased. It can be made smaller to reduce the frictional load between the two. As a result, the vibration reducing effect of the dynamic absorber 40 can be improved.
  • the protrusion 64 is intended to reduce the frictional load when the main body 41 of the dynamic absorber 40 comes into contact with the pedestal 60, and is in contact with the main body 41 in normal times, that is, when no disturbance is applied. It does not have to be.
  • the mounting portion 43 of the dynamic absorber 40 is not fixed to the pedestal 60 by the claw 61 provided on the pedestal 60, but one end of the pedestal 60 in the length direction is L-shaped.
  • the mounting portion 43 is fixed to the pedestal 60 by bending the vertical portion 63 into a vertical portion 63 and inserting the vertical portion 63 into the groove 46 provided in the mounting portion 43.
  • a groove 65 provided on the surface of the pedestal 60 opposite to the surface facing the dynamic absorber 40 is also drawn. The groove 65 can be used to attach the vibration prevention device 30 to the wiper blade 22.
  • the pedestal 60 is provided with a protrusion 64 for reducing the frictional load.
  • the main body 41 is also possible to provide the main body 41 with protrusions for reducing the frictional load.
  • 15A is a plan view showing the vibration prevention device of the second modification
  • FIG. 15B is a cross-sectional view taken along the line BB of FIG. 15A.
  • a protrusion 47 for reducing the frictional load is provided on the surface of the main body 41 corresponding to the pedestal 60.
  • one protrusion 47 is provided on the center line extending in the length direction of the dynamic absorber 40.
  • the protrusion 47 may not be in contact with the surface of the pedestal 60 in normal times, that is, when no disturbance is applied.
  • the number of protrusions 47 provided on the main body 41 may be a plurality.
  • 16A and 16B are a front view and a right side view of the vibration prevention device of the modified example 3, respectively.
  • two protrusions 47 for reducing the frictional load are provided on the surface of the main body 41 corresponding to the pedestal 60. The two protrusions are aligned in the width direction of the dynamic absorber 40.
  • the load applied to the protrusions 47, 64 when the main body 41 tries to contact the pedestal 60 can be dispersed, and the protrusions can be distributed.
  • the life of 47,64 can be extended.
  • FIG. 17 shows a method of assembling the vibration prevention device of the modified example 4.
  • the mounting portion 43 of the dynamic absorber 40 is formed in a mushroom shape so that the tip side becomes thinner along the length direction of the dynamic absorber 40.
  • the pedestal 60 is provided with a recess 66 having a shape capable of receiving the mounting portion 43.
  • the width of the opening of the recess 66 is narrower than the maximum width of the mounting portion 43 but wider than the width of the connecting portion 42.
  • the dynamic absorber 40 can be reliably mounted on the pedestal 60 by press-fitting the mounting portion 43 toward the inside of the recess 66 through the opening of the recess 66.
  • the vibration prevention device of the modified example 4 can be manufactured by integrally molding the pedestal 60 and the dynamic absorber 40.
  • FIG. 18 shows a method of assembling the vibration prevention device of the modified example 5.
  • the vibration prevention device of the modified example 5 is the same as that of the modified example 4 in that the recess 66 for receiving the mounting portion 43 is formed in the pedestal 60, but the width of the opening of the recess 66 is the maximum width of the mounting portion 43. The above points are different from the modified example 4.
  • the mounting portion 43 is fixed by using a fastener such as a lock cap 67 having a gate shape.
  • Claws 68 are formed on the legs of the lock cap 67, and the claws 68 can engage with the fixing holes 69 provided in the pedestal 60.
  • FIG. 19A shows the vibration prevention device of the modification 6.
  • the chamfered shape portion 48A is an inclined portion formed at a position on the wind pressure inflow side in the main body portion 41 of the dynamic absorber 40.
  • FIG. 19B is a side view of the vibration prevention device shown in FIG. 19A, and the flow of air formed around the vibration prevention device when a wind is generated due to the traveling of the vehicle is shown by an arrow D in FIG. 19A. It is shown from the direction of. It can be seen that by providing the chamfered shape portion 48A on the wind pressure inflow side, the air flows smoothly around the vibration prevention device, and the air resistance caused by the vibration prevention device is reduced.
  • FIG. 19C is a side view showing another example of the vibration prevention device of the modification 6. In the vibration prevention device shown in FIG. 19C, a curved portion 48B having a constant curvature is provided as the inclined portion instead of the chamfered shape portion 48A.
  • FIG. 20 shows an assembly process of the vibration prevention device of the modified example 7.
  • the vibration prevention device of the modification 7 is configured to prevent the dynamic absorber 40 from falling off from the pedestal 60 by connecting the connecting member 52 embedded in the dynamic absorber 40 to the pedestal 60. It is a thing.
  • the support protrusion 51 projects from the pedestal 60 at a position between the pair of claws 61 provided on the pedestal 60.
  • the connecting member 52 is embedded in the rubber member in the dynamic absorber 40 so as to connect the mounting portion 43, the connecting portion 42, and the main body portion 41, and one end of the connecting member 52 is fixed to the support projection 51.
  • the connecting member 52 may be made of, for example, a thin leaf spring made of stainless steel such as SUS304 and having a thickness of about 0.1 mm, or may be made of a fiber such as an aramid fiber having excellent tensile strength. good.
  • a thin leaf spring made of stainless steel such as SUS304 and having a thickness of about 0.1 mm
  • a fiber such as an aramid fiber having excellent tensile strength. good.
  • (Modification 8) 21A and 21B are a plan view and a front view of the vibration prevention device of the modified example 8, respectively.
  • This vibration prevention device is the same as that shown in the modified example 6, but is a modified example in that an opening 42C penetrating along the width direction is formed in the connecting portion 42 of the dynamic absorber 40. It is different from 6.
  • the connecting portion 42 of the dynamic absorber 40 is a portion where a large force is easily applied, and is a position where breakage is likely to occur. When the connecting portion 42 breaks, the main body portion 41 falls off.
  • the connecting portion 42 is divided into two portions, that is, an upper connecting portion 42A and a lower connecting portion 42B, with the opening 42C interposed therebetween. Since the breaking of the connecting portion 42 gradually progresses, it is unlikely that both connecting portions 42A and 42B will break at the same time. Therefore, in this vibration prevention device, when one of the connecting portions 42A and 42B breaks, the user notices abnormally, so that the main body portion 41 can be prevented from falling off. Further, by forming the upper connecting portion 42A smaller than the lower connecting portion 42C in the thickness direction of the dynamic absorber 40, the upper connecting portion 42A is preferentially broken when the connecting portion 42 is broken. become.
  • the user can connect by configuring the upper connecting portion 42A so as to preferentially break. It becomes possible to more easily and surely detect the abnormality of the portion 42. Therefore, according to this configuration, it is possible to more reliably prevent the main body 41 of the dynamic absorber 40 from falling off.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

L'invention concerne un dispositif de prévention de vibrations qui est monté sur un balai d'essuie-glace pour empêcher les vibrations du balai d'essuie-glace, le dispositif de prévention des vibrations comprenant un absorbeur de vibrations dynamique, et l'absorbeur de vibrations dynamique étant formé par l'intégration d'un élément en caoutchouc ayant un facteur de perte de 0,1 à 0,6 inclus et d'une masse couverte par l'élément en caoutchouc. La fréquence de résonance de la vibration naturelle de l'absorbeur de vibrations dynamique le long d'une direction de déplacement du balai d'essuie-glace est supérieure ou égale à 5 Hz et inférieure à 20 Hz.
PCT/JP2020/022640 2020-06-09 2020-06-09 Dispositif de prévention des vibrations pour balai d'essuie-glace et balai d'essuie-glace Ceased WO2021250768A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2020/022640 WO2021250768A1 (fr) 2020-06-09 2020-06-09 Dispositif de prévention des vibrations pour balai d'essuie-glace et balai d'essuie-glace

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PCT/JP2020/022640 WO2021250768A1 (fr) 2020-06-09 2020-06-09 Dispositif de prévention des vibrations pour balai d'essuie-glace et balai d'essuie-glace

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7563372B2 (ja) 2021-12-21 2024-10-08 株式会社デンソー ワイパ振動測定装置及びワイパ振動測定方法

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715045A (en) * 1980-07-02 1982-01-26 Kazuma Matsui Preventive device for vibration of wiper
JPS5795237A (en) * 1980-12-04 1982-06-14 Matsui Kazuma Vibration preventing device for wiper
JPS5922041U (ja) * 1982-07-30 1984-02-10 株式会社デンソー ワイパブレ−ド
JPH05278568A (ja) * 1992-03-31 1993-10-26 Asmo Co Ltd ワイパ装置
JPH0721459U (ja) * 1993-09-24 1995-04-18 日本ワイパブレード株式会社 ワイパの振動防止装置
JPH08319375A (ja) * 1995-05-26 1996-12-03 Nippondenso Co Ltd ワイパーブレードゴム
JP2004518577A (ja) * 2001-03-16 2004-06-24 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 特に自動車の板ガラスを払拭するためのワイパブレード
JP2008143215A (ja) * 2006-12-06 2008-06-26 Asmo Co Ltd ワイパ装置
JP2009052687A (ja) * 2007-08-28 2009-03-12 Tokai Rubber Ind Ltd 制振装置
JP2013148207A (ja) * 2012-01-23 2013-08-01 Sumitomo Rubber Ind Ltd 支柱用制振装置および支柱
JP2018118736A (ja) * 2018-05-10 2018-08-02 株式会社デンソー ワイパ制御装置
WO2018198647A1 (fr) * 2017-04-28 2018-11-01 株式会社ブリヂストン Composition de caoutchouc pour caoutchouc antivibration et caoutchouc antivibration pour véhicule

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715045A (en) * 1980-07-02 1982-01-26 Kazuma Matsui Preventive device for vibration of wiper
JPS5795237A (en) * 1980-12-04 1982-06-14 Matsui Kazuma Vibration preventing device for wiper
JPS5922041U (ja) * 1982-07-30 1984-02-10 株式会社デンソー ワイパブレ−ド
JPH05278568A (ja) * 1992-03-31 1993-10-26 Asmo Co Ltd ワイパ装置
JPH0721459U (ja) * 1993-09-24 1995-04-18 日本ワイパブレード株式会社 ワイパの振動防止装置
JPH08319375A (ja) * 1995-05-26 1996-12-03 Nippondenso Co Ltd ワイパーブレードゴム
JP2004518577A (ja) * 2001-03-16 2004-06-24 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 特に自動車の板ガラスを払拭するためのワイパブレード
JP2008143215A (ja) * 2006-12-06 2008-06-26 Asmo Co Ltd ワイパ装置
JP2009052687A (ja) * 2007-08-28 2009-03-12 Tokai Rubber Ind Ltd 制振装置
JP2013148207A (ja) * 2012-01-23 2013-08-01 Sumitomo Rubber Ind Ltd 支柱用制振装置および支柱
WO2018198647A1 (fr) * 2017-04-28 2018-11-01 株式会社ブリヂストン Composition de caoutchouc pour caoutchouc antivibration et caoutchouc antivibration pour véhicule
JP2018118736A (ja) * 2018-05-10 2018-08-02 株式会社デンソー ワイパ制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7563372B2 (ja) 2021-12-21 2024-10-08 株式会社デンソー ワイパ振動測定装置及びワイパ振動測定方法

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