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WO2014007256A1 - Mécanisme de frein à main et frein à main électrique - Google Patents

Mécanisme de frein à main et frein à main électrique Download PDF

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Publication number
WO2014007256A1
WO2014007256A1 PCT/JP2013/068156 JP2013068156W WO2014007256A1 WO 2014007256 A1 WO2014007256 A1 WO 2014007256A1 JP 2013068156 W JP2013068156 W JP 2013068156W WO 2014007256 A1 WO2014007256 A1 WO 2014007256A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
brake shoe
shoe
parking
adjuster
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/JP2013/068156
Other languages
English (en)
Japanese (ja)
Inventor
利史 前原
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.)
Akebono Brake Industry Co Ltd
Original Assignee
Akebono Brake Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Akebono Brake Industry Co Ltd filed Critical Akebono Brake Industry Co Ltd
Publication of WO2014007256A1 publication Critical patent/WO2014007256A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/38—Slack adjusters
    • F16D65/40—Slack adjusters mechanical
    • F16D65/52—Slack adjusters mechanical self-acting in one direction for adjusting excessive play
    • F16D65/56—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut
    • F16D65/561—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake
    • F16D65/565—Slack adjusters mechanical self-acting in one direction for adjusting excessive play with screw-thread and nut for mounting within the confines of a drum brake arranged diametrically opposite to service brake actuator, and subjected to service brake force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/46—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action
    • F16D51/48—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes
    • F16D51/50—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action with two linked or directly-interacting brake shoes mechanically actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
    • F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
    • F16D65/09—Pivots or supporting members therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/14—Mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
    • F16D2125/28—Cams; Levers with cams

Definitions

  • the present invention relates to a parking brake mechanism and an electric parking brake.
  • Drum brake devices are classified into leading trailing, two leading, or duo servo types depending on the fulcrum position at which the brake shoe opens and the anchor structure.
  • the duo-servo type drum brake 501 includes a first brake shoe 503 and a second brake shoe 505 that are disposed opposite to each other in a cylindrical brake drum 509.
  • a pair of brake shoes is provided.
  • the forward rotation direction inlet side (upper side in the figure) of the brake drum 509 is an input portion
  • the forward rotation direction outlet side (lower side in the figure) of the brake drum 509 is provided via an adjuster 515, for example.
  • the second brake shoe 505 is connected to the inlet side (the lower side in the figure).
  • the outlet side (the upper side in the figure) of the second brake shoe 505 is brought into contact with the anchor portion 507 provided on the backing plate, and the anchor reaction force acting on the first brake shoe 503 and the second brake shoe 505 is engaged. Is received by the anchor portion 507.
  • first brake shoe 503 and the second brake shoe 505 are expanded and pressed against the inner peripheral surface 511 of the brake drum 509. Then, the anchor reaction force acting on the first brake shoe 503 is input to the inlet side of the second brake shoe 505, and the second brake shoe 505 acts to be pressed against the inner peripheral surface 511 of the brake drum 509. Therefore, both the first brake shoe 503 and the second brake shoe 505 operate as leading shoes, and a braking force with a very high gain can be obtained.
  • Such a duo-servo type drum brake 501 not only can obtain a very high braking force, but also can be easily reduced in size compared to a leading trailing type or a two leading type drum brake device, and can be incorporated into a disc brake. It may be incorporated as a parking brake mechanism (see Patent Document 1).
  • the duo-servo type drum brake 501 as the parking brake mechanism starts from the state before the operation shown in FIG. 17A by the expansion force of the expansion mechanism (not shown) (the white arrow in the figure).
  • the anchor portion 507 side of the shoe 503 and the second brake shoe 505 is expanded, the expanded first brake shoe 503 and the second brake shoe 505 are anchored to each other at the initial stage of operation shown in FIG. It is separated from the portion 507 and is in pressure contact with the inner peripheral surface 511 of the brake drum 509.
  • the first brake shoe 503 and the second brake shoe 505 move to the adjuster 515 side by a reaction force (arrow in the figure) from the inner peripheral surface 511.
  • the first brake shoe 503 and the second brake shoe 505 move along the curvature of the inner peripheral surface 511 of the brake drum 509, and the brake drum on the side opposite to the anchor portion 507. 509 is in pressure contact with the inner peripheral surface 513. Therefore, from the inner peripheral surface 513, an upward reaction force (arrow in the figure) toward the anchor portion 507 acts on the first brake shoe 503 and the second brake shoe 505.
  • the first brake shoe 503 and the second brake shoe 505 do not have a spreading function on the side opposite to the anchor portion 507 (generally, the adjuster 515 side), the first brake shoe 503 and the second brake shoe 505 have close adhesion to the inner peripheral surface 513 of the brake drum 509. There may be a shortage.
  • the outlet side of the second brake shoe 505 is displaced in the direction in contact with the anchor portion 507, so that the first brake shoe 503 and the second brake shoe 505 are The expansion force of the expansion mechanism decreases due to a slight displacement. Therefore, when the parking braking force is generated, a so-called loosening phenomenon may occur.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a parking brake mechanism and an electric parking brake that can prevent a loosening phenomenon that occurs when a parking braking force is generated in a duo-servo parking brake. .
  • a first brake shoe disposed along the inner peripheral surface of the brake drum, one end of which is an input side from the expansion mechanism, and an inner peripheral surface of the brake drum facing the first brake shoe.
  • a second brake shoe one end of which is an input side from the expansion mechanism, and a backing plate, which are in contact with one end of the first brake shoe and one end of the second brake shoe.
  • an adjuster that is rotatably supported by the first brake shoe and whose input side end abuts the expansion mechanism and whose output side end is connected to the other end side of the second brake shoe.
  • a parking brake mechanism comprising: a transmission lever that is in contact; and a predetermined gap provided between the other end side of the first brake shoe and the adjuster.
  • the parking brake mechanism having the above configuration (1)
  • the one end sides of the first brake shoe and the second brake shoe which are spread apart are separated from the anchor portion, and the inner peripheral surface of the brake drum. Pressure contact.
  • the input from the spreading mechanism to the one end side of the first brake shoe and the input side end of the transmission lever is input to the other end side of the second brake shoe connected to the adjuster via the output side end of the transmission lever. Communicated.
  • the parking brake operation is completed, until the parking braking force is generated by the self-boosting effect of the duo-servo drum brake, one end of the first brake shoe or the second brake shoe comes into contact with the anchor portion and the brake drum Close contact with the inner peripheral surface.
  • the reaction force generated on the adjuster side by the parking braking force is transmitted to the expansion mechanism via the transmission lever, and the first brake shoe A gap provided between the other end side and the adjuster absorbs this minute displacement. Therefore, the expansion force of the expansion mechanism does not decrease, and the loosening that occurs when the parking braking force is generated is prevented. As a result, the safety of the parking brake is improved.
  • the parking brake mechanism having the configuration of (1), wherein a stepped sleeve is penetrated through the first web of the first brake shoe, and the stepped sleeve is penetrated and supported by the backing plate.
  • the lift of the first brake shoe is regulated by the pressing of a spring seat and a sleeve pressing spring that are penetrated by the pin and sandwiched between the stepped portion on the opposite side of the backing plate across the first web.
  • the transmission lever is sandwiched between the first web and the backing plate through the stepped sleeve so as to be rotatable around the stepped sleeve and partially bent into a U shape.
  • a parking brake mechanism that is held by the first brake shoe with the first web sandwiched by one part.
  • the stepped sleeve regulates the lifting of the first brake shoe through the spring seat and the sleeve pressing spring by the through pin supported by the backing plate.
  • the transmission lever is disposed between the first web and the backing plate, and is rotatable around a stepped sleeve that is passed therethrough.
  • the transmission lever that is rotatable about the stepped sleeve is held on the first web by the sandwiching piece that sandwiches the first web. Therefore, both the first web and the transmission lever are supported via the stepped sleeve, and the first brake shoe is prevented from being lifted and the transmission lever is rotatably supported.
  • a first brake shoe disposed along the inner peripheral surface of the brake drum, one end of which is an input side from the expansion mechanism, and an inner peripheral surface of the brake drum facing the first brake shoe.
  • a second brake shoe the other end of which is connected to the other end of the first brake shoe via an adjuster, and a backing plate, and one end of the first brake shoe and the second brake
  • An anchor portion that is in contact with one end of the shoe, and is rotatably supported by the first brake shoe, an input side end is in contact with the expansion mechanism, and an output side end is in contact with the adjuster
  • a parking lever comprising: a switching lever mechanism for expanding the other end side before the one end side of the first brake shoe and the second brake shoe by an input from the expansion mechanism; Over key mechanism.
  • the parking brake mechanism having the above configuration (3)
  • the other end side (adjuster side) of the first brake shoe and the second brake shoe is moved by the input from the expansion mechanism via the switching lever mechanism. It is expanded before one end side (anchor part side). Therefore, the one end side of the first brake shoe and the second brake shoe is moved to the anchor portion side at the time of expansion, and does not leave the anchor portion. Accordingly, since the first brake shoe and the second brake shoe have an expanding force on both the other end side and the one end side, the adhesion between the first brake shoe and the second brake shoe and the drum sliding surface is improved. In addition, loosening that occurs when parking braking force is generated is prevented. As a result, the safety of the parking brake is improved.
  • a parking brake mechanism having the above-described configuration (3), wherein the switching lever mechanism is rotatably supported by the first brake shoe by a first fulcrum pin and is an input side; A second switching lever that is rotatably supported by the first brake shoe by a two fulcrum pin and that is an output side that rotates following the first switching lever, and the first switching lever is expanded
  • the expansion mechanism protruding end provided in the mechanism and the first web are sandwiched in the rotational axis direction, and the second switching lever is sandwiched in the rotational axis direction between the adjuster protruding end provided in the adjuster and the first web.
  • the first switching lever is rotatably held on the first brake shoe by the first fulcrum pin
  • the second switching lever is attached to the first brake shoe by the second fulcrum pin. It is held freely. Therefore, the position of the first fulcrum pin and the second fulcrum pin, the position of the sliding contact between the expansion mechanism and the first switching lever, the position of the sliding contact between the first switching lever and the second switching lever, By setting the position of the sliding contact between the switching lever and the adjuster, an appropriate transmission ratio of the first and second switching levers can be easily selected. Accordingly, it is easy to obtain optimum adhesion between the first brake shoe and the second brake shoe and the drum sliding surface.
  • first switching lever is sandwiched in the rotation axis direction between the expansion mechanism protruding end and the first web
  • second switching lever is sandwiched in the rotation axis direction between the adjuster protruding end and the first web. It is. Therefore, even if the first switching lever and the second switching lever have a flat plate shape, their contact points do not come off, and a simple shape and an inexpensive configuration can be achieved.
  • An electric parking brake including the parking brake mechanism having any one of the above configurations (1) to (4), wherein a parking cable connected to the spreading mechanism is provided on the back side surface of the backing plate.
  • An electric parking brake provided with a driving mechanism for pulling driving.
  • the expansion mechanism when the parking cable is pulled by the driving mechanism disposed on the back side surface of the backing plate, the expansion mechanism can be operated electrically.
  • FIG. 1 is a perspective view of a drum brake constituting the parking brake mechanism according to the first embodiment of the present invention.
  • FIG. 2 is a front view of the drum brake shown in FIG.
  • FIG. 3 is a right side view of the drum brake shown in FIG.
  • FIG. 4 is a rear view of the drum brake shown in FIG.
  • FIG. 5 is a top view of the drum brake shown in FIG. 6 is a VV cross-sectional arrow view of the drum brake shown in FIG.
  • FIG. 7 is a VII-VII cross-sectional enlarged view of the drum brake shown in FIG.
  • FIG. 8 is a sectional view of the drum brake shown in FIG. 2 taken along the line VIII-VIII.
  • FIG. 9 (A) to 9 (D) are action explanatory diagrams showing the drum brake before operation (A), the initial operation (B), the operation end (C), and the braking force generation (D) shown in FIG. is there.
  • FIG. 10 is a perspective view of a drum brake constituting the parking brake mechanism of the second embodiment according to the present invention.
  • FIG. 11 is a front view of the drum brake shown in FIG. 12 is a left side view of the drum brake shown in FIG. 13 is a cross-sectional view of the drum brake shown in FIG. 11 taken along the line XIII-XIII.
  • FIG. 14 is a schematic configuration diagram of the drum brake before the first switching lever and the second switching lever shown in FIG. 11 are actuated.
  • FIG. 15 is a schematic configuration diagram of the drum brake after the first switching lever and the second switching lever shown in FIG. 11 are actuated.
  • 16 (A) to 16 (D) are action explanatory diagrams showing the drum brake before operation (A), the initial operation (B), the operation end (C), and the braking force generation (D) shown in FIG. is there.
  • (A) to (D) in FIG. 17 show the pre-operation (A), initial operation (B), operation end (C), and braking force generation (D) of the duo-servo type drum brake constituting the conventional parking brake mechanism.
  • the drum brake 11 constituting the parking brake mechanism according to the first embodiment is a so-called duo servo drum brake.
  • the drum brake 11 is integrally fixed to the vehicle body in such a posture that the backing plate 13 is substantially perpendicular to the rotational axis of the wheel.
  • a first brake shoe 15 and a second brake shoe 17, which are a pair of brake shoes each having a substantially arc shape, are arranged on the backing plate 13 vertically along the left and right outer peripheral edges.
  • the first brake shoe 15 is arranged along the inner peripheral surface of a brake drum (not shown), and the drum forward rotation direction inlet side (one end side) is an input side from the toggle type spreading mechanism 19.
  • the second brake shoe 17 is disposed along the inner peripheral surface of the brake drum so as to face the first brake shoe 15, and the drum forward rotation direction outlet side (one end side) is an input side from the expansion mechanism 19.
  • the spreading mechanism 19 includes a lever member 25 and a strut 27 that are connected to each other by a connecting pin 23 so as to be relatively rotatable, and the connecting pin 23 is substantially parallel to the backing plate 13. It is arranged with the posture.
  • the lever member 25 is made of a metal plate, and is provided with an engaging portion 29 (concave portion) that is engaged with the second brake shoe 17. Further, a cable latching portion 31 is provided at the other end of the lever member 25, and a latching member fixed to the tip of the parking cable 33 is latched.
  • the strut 27 is formed by bending two metal plates into a substantially U shape.
  • a lever member 25 is disposed inside the strut 27, and the other end opposite to the connecting pin 23 is in close contact with each other.
  • An engagement portion 29 (concave portion) that is bent inward and integrally overlapped with the first brake shoe 15 is provided.
  • the strut 27 is provided with a leaf spring 35 bent into a predetermined shape.
  • the backing plate 13 is equipped with an anchor part 37.
  • the anchor portion 37 is formed by cutting or forging a metal block and is fixed to the backing plate 13.
  • the anchor portion 37 is in contact with the drum forward rotation direction inlet side (one end side) of the first brake shoe 15 and the drum forward rotation direction outlet side (one end side) of the second brake shoe 17.
  • the expansion mechanism 19 is supported in contact with a plurality of bolt heads 39 that integrally fix the anchor portion 37 together with the backing plate 13 to a vehicle carrier (not shown).
  • the backing plate 13 is provided with an insertion hole 41 through which the parking cable 33 is inserted.
  • the cable hooking portion 31 is located at a portion that substantially coincides with the insertion hole 41 in a direction substantially perpendicular to the backing plate 13.
  • the parking cable 33 is hooked on the cable hooking portion 31 by being inserted into the insertion hole from the vehicle body side (lower side in FIG. 7).
  • a tension coil spring 43 shown in FIG. 2 is disposed substantially horizontally between one end sides of the first brake shoe 15 and the second brake shoe 17 supported by the anchor portion 37.
  • the adjuster 21 adjusts the distance between the other ends of the first brake shoe 15 and the second brake shoe 17 in accordance with the progress of wear of the lining 45 of the first brake shoe 15 and the second brake shoe 17.
  • the adjuster 21 moves the distance between the other ends of the first brake shoe 15 and the second brake shoe 17 by the operation of an adjuster lever (not shown) whose tip is brought into contact with the adjustment gear 47 on the adjuster by the adjuster spring 85. Configured to automatically adjust.
  • the first brake shoe 15 and the second brake shoe 17 are held on the backing plate 13 by the first shoe hold-down device 49 and the second shoe hold-down device 51 so as to be expandable.
  • a transmission lever 53 shown in FIGS. 1, 2 and 4 is rotatably supported by the first brake shoe 15. As shown in FIGS. 4 and 8, the transmission lever 53 has an input side end in contact with the expansion mechanism 19 and an output side end in contact with the adjuster 21. The shape of the output side end of the transmission lever 53 is set so that a predetermined gap S1 is formed between the other end side of the first brake shoe 15 and the adjuster 21 (see FIG. 8).
  • the transmission lever 53 is rotatably supported by the first web 55 of the first brake shoe 15 by the first shoe hold-down device 49.
  • the first shoe holddown device 49 includes a stepped sleeve 57, a penetrating pin 59, a spring seat 61, and a sleeve pressing spring 63.
  • a stepped sleeve 57 is passed through the first web 55 of the first brake shoe 15.
  • the stepped sleeve 57 is penetrated by a penetration pin 59 that is penetrated and supported by the backing plate 13.
  • the stepped sleeve 57 has a first brake 55 pressed by a spring seat 61 and a sleeve pressing spring 63 that are interposed between a through pin 59 and a stepped portion 57a opposite to the backing plate 13 across the first web 55.
  • the lifting of the shoe 15 is restricted.
  • the transmission lever 53 passes through the stepped sleeve 57 between the first web 55 and the backing plate 13 and is rotatable around the sleeve 57. Further, the transmission lever 53 is held by the first brake shoe 15 with the first web 55 sandwiched by a sandwiching piece 65 that is partially bent into a U shape.
  • the stepped sleeve 57 is omitted from the configuration of the first shoe hold-down device 49. Accordingly, the second shoe hold-down device 51 is configured such that the sleeve pressing spring 63 directly presses the second web 67.
  • the parking cable 33 acts in a direction substantially perpendicular to the backing plate 13 in accordance with the operation of an operation member (such as an operation lever) in the vehicle compartment. (Downward in FIG. 7).
  • the one end side of the 1st brake shoe 15 and the 2nd brake shoe 17 which were expanded is mutually separated from the anchor part 37, and press-contacts to the internal peripheral surface of a brake drum.
  • a predetermined gap S1 is provided between the other end side of the first brake shoe 15 and the adjuster 21, the expansion to the one end side of the first brake shoe 15 and the input side end of the transmission lever 53 is performed.
  • the input from the opening mechanism 19 is transmitted to the other end side of the second brake shoe 17 connected to the adjuster 21 via the output side end of the transmission lever 53.
  • FIGS. 9A to 9D show before the operation of the drum brake 11 constituting the parking brake mechanism according to the first embodiment (A), the initial operation (B), the operation end (C), and the generation of braking force ( It is an operation explanatory view showing D).
  • the parking cable 33 follows the operation of the operation member (operation lever, etc.) in the vehicle compartment from the state before the operation shown in FIG.
  • the anchoring portion 37 side of the first brake shoe 15 and the second brake shoe 17 is expanded by the expansion force of the expansion mechanism 19 (the white arrow in the figure), and the transmission lever 53 is also connected to the first brake. It is moved together with the shoe 15.
  • the first brake shoe 15 and the second brake shoe 17 that have been expanded are separated from the anchor portion 37 and pressed against the inner peripheral surface 100 of the brake drum.
  • the first brake shoe 15 and the second brake shoe 17 move to the adjuster 21 side by a reaction force (arrow in the figure) from the inner peripheral surface 100.
  • the first brake shoe 15 and the second brake shoe 17 move along the curvature of the inner peripheral surface 100 of the brake drum, and the brake drum on the side opposite to the anchor portion 37 moves. Press contact with the inner peripheral surface 101. Accordingly, from the inner peripheral surface 101, an upward reaction force (in the drawing, an arrow) to the anchor portion 37 side acts on the first brake shoe 15 and the second brake shoe 17.
  • a predetermined gap S1 is provided between the other end side of the first brake shoe 15 and the adjuster 21. The reaction force toward the anchor portion 37 side is stepped from the output side end of the transmission lever 53. It is transmitted to the first brake shoe 15 through the attached sleeve 57.
  • one end side of the second brake shoe 17 comes into contact with the anchor portion 37 until the parking braking force shown in FIG. 9D is generated due to the self-boosting effect of the duo servo drum brake.
  • the inner peripheral surfaces 100 and 101 are in close contact.
  • the first brake shoe 15 and the second brake shoe 17 are slightly displaced, but the reaction force (open arrow in the figure) generated on the adjuster 21 side by the parking braking force is expanded via the transmission lever 53.
  • the gap S1 provided between the other end of the first brake shoe 15 and the adjuster 21 is reduced to the gap S2 to absorb this minute displacement. Therefore, in the drum brake 11 of the first embodiment, the expansion force of the expansion mechanism 19 does not decrease, and the loosening that occurs when the parking braking force is generated is prevented. As a result, the safety of the parking brake is improved.
  • the stepped sleeve 57 has the stepped portion 57 a lifted up from the first brake shoe 15 via the spring seat 61 and the sleeve pressing spring 63 by the through pin 59 supported by the backing plate 13. regulate.
  • the transmission lever 53 is disposed between the first web 55 and the backing plate 13 and is rotatable about a stepped sleeve 57 that is penetrated by the sleeve through hole 69.
  • the transmission lever 53 that is rotatable around the stepped sleeve 57 is held on the first web 55 by a clamping piece 65 that sandwiches the first web 55 in the thickness direction. Accordingly, both the first web 55 and the transmission lever 53 are supported via the stepped sleeve 57, and the first brake shoe 15 is prevented from being lifted up and the transmission lever 53 is rotatably supported. Become.
  • the drum brake 71 constituting the parking brake mechanism according to the second embodiment is called a so-called duo-servo drum brake, like the drum brake 11 according to the first embodiment.
  • symbol is attached
  • the drum brake 71 of the second embodiment includes a first switching lever 73 and a second switching lever 75 instead of the transmission lever 53 used in the drum brake 11 shown in the first embodiment.
  • the switching lever mechanism 74 is used.
  • the first switching lever 73 is rotatably supported by the first fulcrum pin 77 suspended from the first web 55 of the first brake shoe 15 at the position in the drum forward rotation direction inlet side (one end side) of the first brake shoe 15.
  • the second switching lever 75 is rotatably supported at a substantially intermediate position of the first brake shoe 15 by a second fulcrum pin 79 suspended from the first web 55, and rotates on the output side following the first switching lever 73. It becomes.
  • the first switching lever 73 is sandwiched between the expansion mechanism protruding end portion 81 provided in the expansion mechanism 19 and the first web 55 in the rotation axis direction.
  • the second switching lever 75 is sandwiched between the adjuster protruding end 83 provided on the adjuster 21 and the first web 55 in the rotation axis direction.
  • the adjuster 21 side of the first brake shoe 15 and the second brake shoe 17 is urged in the approaching direction by an adjuster spring 85.
  • the first switching lever 73 and the second switching lever 75 are arranged on the adjuster 21 side (the other end) rather than the anchor portion 37 side (one end side) of the first brake shoe 15 and the second brake shoe 17 by the input from the spreading mechanism 19.
  • the distance between the fulcrum, the force point, and the action point is set so that the side) expands first.
  • the strut 27 and the first switching lever 73 are in contact with each other at the first sliding contact 87, and the first switching lever 73 and the second switching lever 73 are in contact with each other.
  • the switching lever 75 is in contact with the second sliding contact 89, and the second switching lever 75 and the adjuster 21 are in contact with the third sliding contact 91. Note that one end sides of the first brake shoe 15 and the second brake shoe 17 supported by the anchor portion 37 are biased in the approaching direction by the tension coil spring 43, but as shown in FIG.
  • the shapes of the first switching lever 73 and the second switching lever 75 are set so that a predetermined gap S is formed between one end side of the shoe 15 and the strut 27 (see FIG. 14).
  • the distance is A
  • the distance between the first fulcrum pin 77 and the second sliding contact 89 in the direction along the virtual center line 93 is B
  • the distance between the second fulcrum pin 79 and the third sliding contact 91 in the direction along the virtual center line 93 is D.
  • Each distance is set to (A / B) ⁇ (C / D)> 1, and a predetermined gap S is provided between one end of the first brake shoe 15 and the strut 27.
  • a predetermined gap S is provided between one end of the first brake shoe 15 and the strut 27.
  • FIG. 16 show the pre-operation (A), initial operation (B), operation end (C), and braking force generation ( It is an operation explanatory view showing D).
  • the parking cable 33 is operated according to the operation of the operation member (operation lever or the like) in the vehicle compartment from the state before the operation shown in FIG.
  • a predetermined gap S is provided between the one end side of the first brake shoe 15 and the strut 27, so that the first expansion force (the white arrow in the drawing) of the expansion mechanism 19 is the first.
  • the first switching lever 73 is rotated counterclockwise about the first fulcrum pin 77.
  • the first switching lever 73 presses the second switching lever 75, and the second switching lever 75 rotates counterclockwise around the second fulcrum pin 79.
  • the second switching lever 75 presses the adjuster 21 side (the other end side) of the second brake shoe 17 via the adjuster 21.
  • the first brake shoe 15 and the second brake shoe 17 are opened on the adjuster 21 side and pressed against the inner peripheral surface 101 of the brake drum, and then the reaction force from the inner peripheral surface 101 (arrow in the figure). It moves to the anchor part 37 side.
  • the adjuster 21 side (the anti-anchor side) of the first brake shoe 15 and the second brake shoe 17 is first expanded. Therefore, the anchor portion 37 side of the first brake shoe 15 and the second brake shoe 17 is moved to the anchor portion 37 side during the expansion, and does not leave the anchor portion 37.
  • the first brake shoe 15 and the second brake shoe 17 are placed on the inner peripheral surface 101 of the brake drum on the adjuster 21 side and the inner peripheral surface 100 of the brake drum on the anchor portion 37 side. Press contact. Therefore, an inward reaction force (arrow in the figure) toward the adjuster 21 acts on the first brake shoe 15 and the second brake shoe 17 from the inner peripheral surface 101 of the brake drum on the adjuster 21 side, and the anchor portion A downward reaction force (arrow in the figure) acts from the inner peripheral surface 100 of the brake drum on the 37 side toward the adjuster 21 side.
  • the first brake shoe 15 and the second brake shoe 17 are expanded on both the anchor portion 37 and the adjuster 21 side, and the adhesion to the brake drum sliding surface is improved.
  • the anchor portion 37 (one end side) of the first brake shoe 15 or the second brake shoe 17 is displaced in a direction in contact with the anchor portion 37. The loosening phenomenon that occurs is prevented.
  • the first brake shoe 15 and the first brake shoe 15 are connected to each other by the input from the expansion mechanism 19 via the switching lever mechanism 74 including the first switching lever 73 and the second switching lever 75.
  • the adjuster 21 side (the other end side) with the two brake shoes 17 is expanded before the anchor portion 37 side rod (one end side). Therefore, the anchor portion 37 side of the first brake shoe 15 and the second brake shoe 17 is moved to the anchor portion 37 side during the expansion, and does not leave the anchor portion 37. Accordingly, since the first brake shoe 15 and the second brake shoe 17 have an expanding force on both the adjuster 21 side and the anchor portion 37 side, the first brake shoe 15 and the second brake shoe 17 and the drum sliding surface. And the looseness that occurs when parking braking force is generated is prevented. As a result, the safety of the parking brake is improved.
  • the first switching lever 73 is rotatably held by the first brake shoe 15 by the first fulcrum pin 77, and the second switching lever 75 is rotated by the second fulcrum pin 79.
  • One brake shoe 15 is rotatably held. Therefore, the positions of the first fulcrum pin 77 and the second fulcrum pin 79, the position of the first sliding contact 87 between the strut 27 and the first switching lever 73, and the positions of the first switching lever 73 and the second switching lever 75.
  • an appropriate transmission ratio of the first and second switching levers 73 and 75 can be easily selected. can do. Therefore, it becomes easy to obtain the optimum adhesion between the first brake shoe 15 and the second brake shoe 17 and the drum sliding surface.
  • first switching lever 73 is sandwiched between the expansion mechanism protruding end portion 81 and the first web 55 in the rotation axis direction
  • second switching lever 75 is interposed between the adjuster protruding end portion 83 and the first web 55. Is sandwiched in the direction of the rotation axis. Therefore, even if the first switching lever 73 and the second switching lever 75 have a flat plate shape, their contact points do not come off, and a simple shape and an inexpensive configuration can be achieved.
  • the drum brake 11 and the drum brake 71 according to the first and second embodiments are disposed on the backing plate rear side surface 97 of the backing plate 13 and pull the parking cable 33 connected to the spreading mechanism 19 to drive the driving mechanism.
  • a motor gear unit 95 see FIG. 13
  • an electric parking brake can be obtained.
  • the expansion mechanism 19 can be operated electrically.
  • the drum brake 11 or the drum brake 71 constituting the parking brake mechanism according to the present embodiment it is possible to prevent the loosening phenomenon that occurs when the parking braking force is generated in the duo servo parking brake.
  • the parking brake can be electrified.
  • a second brake shoe 17 disposed along the peripheral surface and having one end side as an input side from the expansion mechanism 19 and a backing plate 13 are provided.
  • One end side of the first brake shoe 15 and the second brake shoe are provided.
  • An anchor portion 37 that is in contact with one end of the shoe 17 and the first brake shoe 15 are rotatably supported.
  • An input side end contacts the expansion mechanism 19 and an output side end is the second brake shoe.
  • a parking brake mechanism provided with S1. [2] The parking brake mechanism of [1] above, A stepped sleeve 57 is passed through the first web 55 of the first brake shoe 15; The stepped sleeve 57 is penetrated by a penetration pin 59 that is penetrated and supported by the backing plate 13, and a stepped portion 57 a on the opposite side of the backing plate 13 across the first web 55 is between the penetration pin 59.
  • the lifting of the first brake shoe 15 is restricted by the pressing of the spring seat 61 and the sleeve pressing spring 63 interposed between The transmission lever 53 is penetrated by the stepped sleeve 57 between the first web 55 and the backing plate 13 and is rotatable about the stepped sleeve 57, and a part thereof is bent in a U shape.
  • a parking brake mechanism that is held by the first brake shoe 15 with the first web 55 sandwiched by the sandwiched piece 65.
  • An electric parking brake comprising the parking brake mechanism according to [1] or [2], An electric parking brake in which a driving mechanism (motor gear unit) 95 that pulls and drives the parking cable 33 connected to the expansion mechanism 19 is disposed on the backing plate back side surface 97 of the backing plate 13.
  • a first brake shoe 15 that is disposed along the inner peripheral surface of the brake drum and that has one end side as an input side from the expansion mechanism 19;
  • a second brake shoe 17 is disposed along the inner peripheral surface of the brake drum so as to face the first brake shoe 15 and has the other end connected to the other end of the first brake shoe 15 via an adjuster 21.
  • a parking brake mechanism comprising: a first brake shoe 15 and a switching lever mechanism 74 that opens the other end side before one end side of the second brake shoe 17.
  • the parking brake mechanism of [4] above, The switching lever mechanism 74 is rotatably supported on the first brake shoe 15 by the first fulcrum pin 77 and is rotated to the first brake shoe 15 by the first switching lever 73 on the input side and the second fulcrum pin 79.
  • a second switching lever 75 that is freely supported and is an output side that rotates following the first switching lever 73;
  • the first switching lever 73 is sandwiched between the expansion mechanism protruding end portion 81 provided in the expansion mechanism 19 and the first web 55 in the rotation axis direction,
  • a parking brake mechanism in which the second switching lever 75 is sandwiched between an adjuster protruding end 83 provided on the adjuster 21 and the first web 55 in the rotation axis direction.
  • the parking brake mechanism and the electric parking brake of the present invention are not limited to the above-described embodiment, and can be appropriately modified and improved.
  • the material, shape, dimensions, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
  • This application is based on a Japanese patent application (Japanese Patent Application No. 2012-150638) filed on July 4, 2012, the contents of which are incorporated herein by reference.
  • the parking brake mechanism of the present invention in the duo servo parking brake, it is possible to prevent a loosening phenomenon that occurs when a parking braking force is generated. Moreover, according to the electric parking brake according to the present invention, the parking brake can be electrified.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
PCT/JP2013/068156 2012-07-04 2013-07-02 Mécanisme de frein à main et frein à main électrique Ceased WO2014007256A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012150638A JP5950731B2 (ja) 2012-07-04 2012-07-04 パーキングブレーキ機構および電動パーキングブレーキ
JP2012-150638 2012-07-04

Publications (1)

Publication Number Publication Date
WO2014007256A1 true WO2014007256A1 (fr) 2014-01-09

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Application Number Title Priority Date Filing Date
PCT/JP2013/068156 Ceased WO2014007256A1 (fr) 2012-07-04 2013-07-02 Mécanisme de frein à main et frein à main électrique

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Country Link
JP (1) JP5950731B2 (fr)
WO (1) WO2014007256A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0682228B2 (ja) 1986-08-29 1994-10-19 株式会社鐵原 現像剤用鉄粉キヤリアの製造方法
JP2019163827A (ja) * 2018-03-20 2019-09-26 日信工業株式会社 車両用ドラムブレーキ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002181087A (ja) * 2000-12-12 2002-06-26 Akebono Brake Ind Co Ltd ドラムブレーキ装置のシュー駆動機構
JP2010133465A (ja) * 2008-12-03 2010-06-17 Akebono Brake Ind Co Ltd ドラムブレーキ装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002181087A (ja) * 2000-12-12 2002-06-26 Akebono Brake Ind Co Ltd ドラムブレーキ装置のシュー駆動機構
JP2010133465A (ja) * 2008-12-03 2010-06-17 Akebono Brake Ind Co Ltd ドラムブレーキ装置

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JP2014013060A (ja) 2014-01-23

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