ES2332618B1 - FRONT SUSPENSION FOR VEHICLES. - Google Patents

Abstract

Front suspension for vehicles.

Object: Suppress the generation of noise by a open bottom end of a stem tube with a number reduced parts and a simplified assembly process.

Means of solution: A front suspension for a vehicle that has a frame body, a front tube 16 connected to the frame of body, and a rod tube 17 pivotally supported in the front tube 16. A wind guide element 19A is arranged in front of an open bottom end 17A of the stem tube 17 of way to guide the march wind W in one direction default that deviates from the open bottom end 17A.

Description

Front suspension for vehicle.

Technical field

The present invention relates to a front suspension for a vehicle, and more particularly to a noise suppression structure to cancel out the noise generated in a rod tube (steering rod) that has one end bottom open on a motorcycle due to the wind of March.

Prior art

In general, an upper bridge and a bridge bottom to support a front fork on a motorcycle They are attached to a stem tube. The stem tube is supported pivotally by means of bearings to a front tube of a motorcycle body frame. Actuating a handlebar of bar fixed to an upper portion of the upper bridge, the front fork pivots around the axis of the stem tube and therefore addressed (see Patent Document 1, for example).

In this case, the stem tube has a lower end open.

Patent Document 1: Model Publication of  Japanese utility number Sho 57-141227

Patent Document 2: Model Publication of  Japanese utility number Sho 62-32146

Description of the invention Problem to solve with the invention

In the mentioned conventional motorcycle previously, a plug (cap) is mounted on the lower end open the stem tube to cancel out the noise generated in the open bottom end of the stem tube due to the wind of gear (see Patent Document 2, for example).

Consequently, the problem arises that increases the number of pieces and complicates the process of mounting.

Therefore, an object of the present invention is to provide a front suspension for a vehicle that can cancel the generation of noise at the open bottom end of the stem tube with a reduced number of parts and a process Simplified assembly.

Means to solve the problem

According to the present invention, a front suspension for a vehicle that has a frame body, a front tube connected to a front portion of the body frame, and a supported stem tube pivotally in the front tube, including the suspension front a wind guide element arranged in front of a open bottom end of the stem tube to guide the wind running in a predetermined direction that deviates from the end bottom open.

With this configuration, the guide element of wind is arranged in front of the open bottom end of the tube Stem to guide the running wind in the direction default that deviates from the open bottom end. By consequently, the flow of running wind which flows to the open bottom end of the stem tube to suppress the generation of noise at that open lower end of the stem tube due to wind during the march of the motorcycle.

Preferably, the front suspension includes  also a lower bridge to which the tube is connected rod, a brake support arranged in a front portion of the lower bridge, and a brake sleeve that extends from a hydraulic disc brake and connected to the brake support; being arranged the wind guide element in the brake support.

More preferably, the brake support is located inside a front fairing.

As a modification, the front suspension includes a lower bridge to which the tube is connected stem; the wind guide element being integrated with the lower bridge in its front portion or mounted as a separate element in the front portion of the lower bridge.

Effect of the invention

According to the present invention, it is possible to suppress noise generation from the lower open end of the tube stem with a small number of parts and an assembly process simplified.

Brief description of the drawings

Figure 1 is a general side view of a motorcycle according to a first preferred embodiment of the present invention.

Figure 2 is a side view of a part of the vehicle near the front forks.

Figure 3 is an enlarged view of a portion near a brake support.

Figure 4 is a front elevation view of the brake support in its assembled condition.

Figure 5 is a left side view of the brake support

Figure 6 is a front elevation view of the brake support

Figure 7 is a horizontal section view of the brake support.

Figure 8 is an enlarged side view that shows the configuration of a second preferred embodiment by  of a lower bridge.

Figure 9 is a plan view of the bridge lower.

Figure 10 is a front elevation view of the lower bridge

Description of reference symbols

one:

Motorcycle (vehicle)

3:

Front fork

6:

Engine

fifteen:

Front fairing

15A:

Air introduction hole

17:

Shank tube

17A:

Lower end open

19:

Brake support

19A:

Wind guide element

30:

Lower bridge

30A:

Wind guide element

42:

lighthouse

Best way to put the invention into practice

Some preferred embodiments of the present The invention will now be described with reference to the drawings. In This description assumes that the terms "forward", "rear", "right" and "left" are defined with regarding the direction of movement of a vehicle.

First realization favorite

Figure 1 is a general side view of a motorcycle according to a first preferred embodiment of the present invention. Motorcycle 1 includes a pair of front forks right and left 3 pivotally supported on a portion of front end of a body frame (not shown) and a pair of right and left handlebars 4 mounted on  the upper ends of the right front forks e left 3 and located in an upper front portion of a vehicle body

Motorcycle 1 also includes a wheel front 5 rotatably supported on front forks 3, a motor 6 supported on the body frame, a radiator 7 located in front of the engine 6, a rear fork 8 supported vertically tilting at the rear end of engine 6 and the body frame, and a rear wheel 9 supported rotatably on a rear portion of the rear fork 8. The front wheel 5 is provided with a brake shoe 51, and a hydraulic brake sleeve 52 is connected to the piston of the front brake shoe 51.

Motorcycle 1 also includes a deposit of fuel 10 located in an upper portion of the frame of body, a biker seat 11 located behind the tank of fuel 10, as well as a seat for a motorcyclist, and a passenger seat 12 located behind the biker seat 11. Almost the entire front portion of the vehicle body is covers with a front fairing 15, and a rear fairing 13 is located behind the biker seat 11 and the seat of companion 12. A pair of side compartments 14 are arranged on opposite sides of a body portion of  vehicle under the passenger seat 12.

Figure 2 is a side view of a part of the vehicle near the front forks 3.

The body frame includes a tube front 16, and a rod tube 17 is pivotally supported, by means of bearings (not shown), in the front tube 16. One upper end portion of the stem tube 17 engages in a hole (not shown) formed in an upper bridge 41, and a lower end portion of the stem tube 17 engaged in a hole (not shown) formed on a lower bridge 18. The stem tube 17 has an open bottom end 17A.

The front wheel 5 rotatably supported on the front forks 3 pivots around the axis of the tube stem 17 and therefore is directed by operating the handlebars of bar 4. These are provided with a main cylinder 53 which It has a deposit.

Figure 3 is an enlarged view of a part next to a brake support 19.

As shown in Figure 3, the support of brake 19 is mounted on a front end surface of the lower bridge 18. Brake support 19 has portions front 19C. The brake support 19 is mounted on the bridge bottom 18, such that the two front portions 19C are mounted on two front portions 18A formed on the surface front end of the lower bridge 18 tightening two bolts 20 a through the front portions 19C to the lower bridge 18.

The motorcycle 1 according to this embodiment preferred has a double combined brake system in such a way that when a handlebar brake or a foot brake is applied, the front and rear wheel brakes perform a lock on each other With an adequate distribution relationship.

Figure 4 is a front elevation view of the brake support 19 in mounted position. Figure 5 is a view left side of the brake support 19, figure 6 is a view in front elevation of the brake support 19, and Figure 7 is a horizontal section view of the brake support 19.

The double combined brake system in the motorcycle 1 includes brake support 19, and as depicted in figure 7, the brake support 19 incorporates two steps of substantially L-shaped oil 19F. Each oil passage 19F it is arranged in a front portion 19D of the brake support 19 which opens to the front surface and a side portion 19E of the said support 19 that opens to the lateral surface correspondent.

As shown in Figure 4, a fitting 23 connected to a rear brake hose 21RR is located in the front portion 19D of the oil passage 19F on the right side as seen in figure 4, and this fitting 23 is connected to the corresponding front portion 19D by a bolt 24. Also, another fitting 23 connected to a front brake hose 21FR is located in the front portion 19D of the oil passage 19F in the left side as seen in figure 4, and this fitting 23 is connected to the corresponding front joint portion 19D of the brake support 19 by another bolt 24.

In addition, a fitting 25 connected to a sleeve of 22RR rear brake is located on the side portion 19E of the passage of oil 19F on the right side as seen in figure 4, and this fitting 25 is connected to the corresponding side portion 19E by a bolt 26. Similarly, another fitting 25 connected to a sleeve front brake 22FR is located on the side portion 19E of the oil passage 19F on the left side as seen in figure 4,  and this fitting 25 is connected to the side portion corresponding 19E by another bolt 26.

As shown in Figure 6, the support of brake 19 is integrally formed with two restriction portions position (rotation stops) 19G at the ends laterally opposites The 19G position restriction portion on the side right as seen in figure 6 serves to restrict the extension direction of the rear brake sleeve 22RR, and the 19G position restriction portion on the left side according to seen in figure 6 serves to restrict the direction of 22FR front brake hose extension. Also two position restriction portions (rotation stops) 19H are form on the front side of the brake joint 19. The portion of position restriction 19H on the left side as seen in the Figure 4 serves to restrict the extension address of the 21FR front brake sleeve, and restriction portion of position 19H on the right side as seen in figure 4 serves to restrict the extension direction of the brake sleeve 21RR rear

In addition, the brake support 19 is formed integrally with a sheet-shaped wind guide element 19A on the front side so that it extends between the two 19G position restriction portions. The guiding element of wind 19A is formed substantially at the same level as that of each position restriction portion 19G so that it is placed in a lower end portion of the brake support 19. The support Brake 19 is located in an area surrounded by right fairings and left that constitutes the front fairing 15 and a fairing surface formed under a lighthouse 42. In addition, the open bottom end 17A of the stem tube 17 is placed at  a level lower than that of the lower end of the guide element of wind 19A (see figure 3).

As shown in figure 1, a hole 15A for air introduction is formed in an end portion front of the front fairing 15 under the headlight 42, and the wind gear W (see Figure 2) is introduced through hole 15A and it probably flows to the open bottom end 17A of the tube of rod 17. Wind guide element 19A serves to guide the march wind W in a direction such that the march wind W deviates from the open bottom end 17A of the stem tube 17. In other words, the wind guide element 19A serves to guide the march wind W in a predetermined direction that deflects the open bottom end 17A of the stem tube 17.

Now the operation of the element of 19A wind guide to suppress tube noise generation of stem 17.

A mechanism of noise generation in case of not having the guide element of wind 19A.

An air flow corresponding to the wind of gear W introduced through hole 15A of front fairing 15 collides at the edge of the open bottom end 17A of the tube stem 17 entering the stem tube 17 from the end bottom open 17A. Then, the pressure inside the tube of stem 17 is increased producing the extrusion of the air flow of the stem tube 17.

As a result, a variation occurs snapshot of air pressure or flow rate inside (and outside) the  stem tube 17. Next, a winding air flow corresponding to this variation advances inside the stem tube 17 and is reflected in the closed upper end of the stem tube 17 returning to the lower open end 17A.

The winding air flow that returns to the open bottom end 17A of the stem tube 17 interacts with another winding air flow that advances towards the upper end closed from the stem tube 17, thereby improving a component of specific frequency contained in the turbulent flow (which produces resonance).

As a result, frequency components of the air flow in the stem tube 17 converge to the component of specific frequency, and only the vibrations that have the specific frequency component determined by the length of the stem tube 17, for example, are left within a very period short of time Such remaining vibrations are heard as noise by the biker.

In the event that the wind guide element 19A is arranged in a lower front portion of the support brake 19 according to this preferred embodiment, a whirlpool is generated of air behind wind guide element 19A during travel of the vehicle, so that the running wind W introduced by hole 15A and probably flowing towards the lower end open 17A of the stem tube 17 is guided in the direction default that deviates from the open bottom end 17A of the stem tube 17, thereby suppressing the amount of air entering the stem tube 17 of the lower open end 17A.

Thus, it is possible to avoid noise generation of the stem tube 17 by the provision of the guide element of wind 19A. Although noise is generated in the stem tube 17, the Noise level is so low that it is not heard by the biker.

According to this preferred embodiment mentioned above, the wind guide element 19A of the support of brake 19 is arranged in front of the open bottom end 17A of the stem tube 17 to guide the running wind W in the direction default that deviates from the open bottom end 17A. By consequently, it is possible to suppress tube noise generation of rod 17 during the running of the vehicle.

Second embodiment favorite

In contrast to the first embodiment preferred where the wind guide element 19A is arranged in  the brake support 19, the second preferred embodiment is characterized in that a wind guide element has been arranged 30A on a lower bridge 30 as shown in Figure 8.

Figure 8 is an enlarged side view that shows the configuration of the second preferred embodiment by of the lower bridge 30. In Figure 8, the lower bridge 30 is represents in cross section to facilitate the illustration.

The stem tube 17 is provided with a hole 30B formed through the bottom bridge 30, and the end open bottom 17A of the stem tube 17 protrudes from the lower surface of the lower bridge 30, that is, of the hole 30B.

The lower bridge 30 is integrally formed with the wind guide element 30A at an end portion Forward.

Figure 9 is a plan view of the bridge bottom 30, and figure 10 is a front elevation view of the lower bridge 30.

As depicted in Figures 9 and 10, the wind guide element 30A is formed in a front portion bottom of the bottom bridge 30 so that it protrudes towards below its bottom surface, and hole 30B for insertion of the stem tube 17 is formed in a rear portion of the bridge lower 30 behind the wind guide element 30A. In addition, a 30CL hole for insertion of the left front fork 3 (3L) is formed in a left portion of the lower bridge 30, and a  30CR hole for right front fork insertion 3 (3R) is formed in a right portion of the lower bridge 30. In addition, two front portions 30D of the lower bridge 30 for mount a brake support are formed on the front surface of the lower bridge 30 in a position above the guide element of wind 30A.

As in the first preferred embodiment, the running wind W is introduced by the hole 15A formed in a front end portion of the front fairing 15 below the headlight 42 and probably flows to the open lower end 17A of the stem tube 17. The wind guide element 30A of the lower bridge 30 serves to guide the running wind W in the default address that deviates from the open bottom end 17A of the stem tube 17. The brake support is located in the area surrounded by the right and left fairings that constitutes the front fairing 15 and the fairing surface formed under the headlight 42. In addition, the open bottom end 17A of the stem tube 17 is placed at a lower level than that of the lower end of the wind guide element 30A (see figure 8).

By providing the guide element of wind 30A, an eddy of air is generated behind the element of wind guide 30A during the running of the vehicle, so that the running wind W introduced through hole 15A and flowing probably towards the open bottom end 17A of the tube stem 17 is guided in the predetermined direction that deviates from the open bottom end 17A of the stem tube 17, reducing by therefore the amount of air entering the stem tube 17 of the  open bottom end 17A. Thus, it is possible to avoid the generation of noise of the stem tube 17 by the provision of the element of 30A wind guide. Although noise is generated in the stem tube 17, the noise level is so low that it is not heard by the biker

According to the second preferred embodiment mentioned above, the wind guide element 30A of the lower bridge 30 is arranged in front of the open lower end 17A of the stem tube 17 to guide the running wind W in the default address that deviates from the open bottom end 17A. Therefore, it is possible to suppress noise generation of the stem tube 17 during the running of the vehicle.

Modifications

Although the wind guide element is integrated with the brake support or the lower bridge in the embodiments preferred above, the wind guide element may be mounted as a separate element to the brake support or bridge lower.

In addition, although the present invention applies to a steering structure on a motorcycle in the Preferred embodiments above, the present invention can be also apply to a steering structure in a vehicle of three wheels, four wheel vehicle, etc.

Claims (4)

1. A front suspension for a vehicle that includes a body frame, a front tube connected to a front portion of said body frame, and a rod tube pivotally supported on said front tube, is characterized in that:

-

incorporates a wind guide element arranged in front of an open bottom end of the tube rod (17) to guide the running wind in one direction default that deviates from said lower end open;

-

includes a lower bridge (30) to which said rod tube (17), brake support (19) is connected disposed in a front portion of said lower bridge (30), and a brake sleeve that extends from a disc brake hydraulic and connected to said brake support (19);

-

saying wind guide element is disposed in said brake support (19);

-

be integrally forms a wind guide element (19A) with the brake support (19);

-

he wind guide element has the space between the tubes of stem (17) and extends down.

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2. The front suspension for the vehicle according to claim 1, characterized in that said brake support (19) is located inside a front fairing (15). 3. The front suspension for the vehicle according to claim 1, characterized in that:

-

a lateral portion (19E) of the brake support (19) as a joint with the brake sleeve, said lateral portion (19E) is formed in the end of the width of the brake support portion (19);

-

a position restriction material (19H) is projected out in the sense of the width of the flange of a joint side of the wind guide element (19A).

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4. The front suspension for the vehicle according to claim 1, characterized in that:

-

a brake hose (21FR-21RR) is connected to the front part of a brake support portion (19);

-

he wind guide element (19A) is arranged below the brake hose (21FR-21RR).