JPH0729345U - Wheel damper - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the handling when the wheel damper is fitted. [Structure] The partition wall pressure contact portion 26 of the wheel damper 8 is integrally formed with a pressure contact protrusion 27 protruding outward, and a groove 28 is formed at the base of the pressure contact protrusion 27 inside the damper chamber. When the wheel damper 8 is fitted into the damper chamber 3, the pressure contact projection 27 is deformed while falling down on the groove 28, presses against the inner surface of the partition wall 7, and does not easily fall off during the assembly work to the completed vehicle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wheel damper provided on a drive wheel of a motorcycle or the like.

[0002]

[Prior art]

 Japanese Utility Model Laid-Open No. 54-43752 is an example of such a device. In this model, the wheel hub has a wheel damper loading chamber defined by radial partition walls, and the rubber wheel damper is housed in this chamber. The wings of the are fitted into the wheel damper.

[0003]

[Problems to be solved by the device]

 In the above-mentioned publicly known example, since the wheel damper is simply fitted into the damper chamber, it is likely to fall off during the assembly work to the completed vehicle, which requires careful handling and significantly reduces workability. became.

In addition, an arrow-shaped projection integrally formed in advance on the surface of the wheel damper is provided, and the projection is fitted into a mounting hole that is also formed through the wall of the damper chamber in advance. It may also be designed to prevent falling. However, according to this structure, during the work of fitting the wheel damper into the damper chamber, the work of inserting the arrow-shaped projection into the mounting hole in the damper chamber is required, and it is pulled out using a tool such as radio pliers. It takes time and effort.

Further, since the wheel damper serves to buffer the impact force in the rotation direction generated by driving, the neck portion of the arrow-shaped projection may be damaged due to the force applied thereto. In such a situation, mud, water, dust, etc. could enter the damper chamber through the mounting holes and reduce the durability of the wheel damper. Therefore, the present invention aims to solve such problems.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the wheel damper according to the present application projects in the circumferential wall direction at least at a part of the fitting pressure contact portion that is pressed against and contacts the inner surface of the circumferential wall of the damper chamber during fitting, and is orthogonal to the fitting direction. It is characterized in that a press-contact projection extending in the direction of the press-contact is formed, and a groove extending along the press-contact projection is provided in the damper chamber inner side portion at the base of the press-contact projection.

[0007]

[Action]

 When the wheel damper is fitted into the damper chamber, the pressure contact protrusion is pressed against the inner surface of the peripheral wall of the damper chamber and is elastically deformed. At this time, since there is a groove on the inner side of the damper chamber at the base of the pressure-contacting protrusion, the pressure-contacting protrusion is deformed so as to fall toward the inside of the damper chamber, and is pressed against the inner surface of the peripheral wall of the damper chamber. As a result, the wheel damper generates a force inward in the radial and axial directions of the hub due to the pressure contact projections that are pressed against the inner surface of the peripheral wall of the damper chamber, which makes it difficult for the wheel damper to fall off during handling during assembly of a completed vehicle.

[0008]

[Effect of device]

 Since the wheel bumper is integrally provided with a pressure contact projection for press-contacting the inner surface of the peripheral wall of the damper chamber during fitting, it is possible to prevent the wheel damper from falling off during the transfer work in the state of being fitted in the damper chamber. Improves workability and improves workability when mounting on finished vehicles.

Further, unlike the above-mentioned conventional example, since it is not necessary to provide a mounting hole for fitting the arrow-shaped projection in the damper chamber, deterioration of the function such as deterioration of the wheel damper due to an intruder from the mounting hole is reduced. The troubles that lead to

In addition, since the groove is provided in the damper chamber inner portion at the base of the pressure contact projection, the direction in which the pressure contact projection falls is constant, which can be useful for surely preventing the pressure contact projection from falling off. Further, by providing this groove, when fitting into the damper chamber, the escape of the pressure-increasing press-up projection is secured, and the fitting operation itself becomes easier.

[0011]

【Example】

 An embodiment will be described based on FIGS. 1 to 4. FIG. 2 is a development view showing a configuration of a wheel damper configured for the rear wheels of the motorcycle according to the present embodiment, and a portion A in the figure shows the sprocket inverted and enlarged. .

In this figure, the hub 2 of the rear wheel 1 is formed with a damper chamber 3 which is open to the outside on one side. The damper chamber 3 is formed between the outer circumference of the axle cylinder portion 4 and the outer circumference portion 5 of the hub and the bottom wall 6, and the interior thereof extends radially from the axle cylinder portion 4 toward the outer circumference portion 5. In this embodiment, it is divided into four parts by the partition walls 7 which are integrally formed at equal intervals. The outer peripheral surface of the axle tubular portion 4, the outer peripheral portion 5 of the hub, and the partition wall 7 constitute the peripheral wall portion of the present application.

A wheel damper 8, which will be described in detail later, is fitted into each damper chamber 3 from the outside. A fitting hole 9 is formed in the center of each wheel damper 8.

The outer surface of the hub 2 to which the wheel damper 8 is fitted is covered with a driven flange 10 which is fitted to one end of the axle cylinder portion 4, and the inner side surface thereof is radially radially equidistantly spaced. The wing 11 projectingly formed is fitted into the fitting hole 9 of each wheel damper 8.

A driven sprocket 12 to which the driving force of the engine is transmitted is attached to the driven flange 10. In addition, a bearing 13 and a seal ring 14 are fitted in the axle tubular portion 4, and the hub 2 is rotatably supported by an axle 15 penetrating the bearing 13.

Therefore, when the driving force of the engine is transmitted to the driven sprocket 12, it is transmitted from the driven flange 10 to the hub 2 via the wheel damper 8, and the rear wheel 1 is rotated around the axle 15. At this time, when the shock is transmitted from the driven sprocket 12, it is buffered by the wheel damper 8 and becomes difficult to be transmitted to the hub 2 side.

FIG. 1 is a plan view of the wheel damper 8 and also shows an enlarged rotational cross section in a portion (B). Further, FIG. 3 shows an enlarged cross section taken along the line CC of FIG.

In these figures, the wheel damper 8 is formed by sandwiching a fitting hole 9 in the center. A pair of main bodies 20, 20 are connected and integrated at an inner peripheral portion 21 by a bridge 22 having a shape that is easily deformable. ing.

Further, in the outer peripheral portion 23, the cutting bridges 24, 24 extend in mutually opposing directions from the portions facing each other at the respective edges of the fitting hole 9, and the respective tip ends of the respective cutting bridges 24. Are discontinuous across the cutting portion 25.

As is apparent from the enlarged cross section shown in part (B) of FIG. 1, the partition wall pressure contact portion 26 of the main body portion 20 is integrally formed with a pressure contact protrusion 27 protruding outward in the circumferential direction. Along the partition wall pressure contact portion 26, it extends long in the radial direction, that is, in the direction orthogonal to the fitting direction of the wheel damper 8. A groove 28 is formed along the base of the press contact protrusion 27 on the damper chamber inner side (the side closer to the bottom wall 6 in the damper chamber 3). The length of the groove 28 is substantially the same as the length of the press contact protrusion 27.

The wheel damper 8 has such a size and shape that it can be tightly fitted into the damper chamber 3 except for the pressure contact projection 27, and the cutting portion 25 facilitates this fitting. As shown in part (B) of FIG. 1, the press contact protrusion 27 has a protrusion amount h in a non-deformed state, and when the wheel damper 8 is fitted into the damper chamber 3, it deforms while interfering with the partition wall 7. It is protruding to the extent that it can be made.

The pressure contact protrusion 27 is also a volume-up portion that partially protrudes from the general surface 29 of the partition wall pressure contact portion 26 of the main body portion 20. The inner peripheral portion 21, the outer peripheral portion 23, and the partition wall pressure contact portion 26, which are the outer peripheral portion of the wheel damper 8, correspond to the fitting pressure contact portion in the present application, respectively.

Next, the operation of the embodiment will be described with reference to FIG. Part (D) in the figure is a diagram showing a part similar to part B in FIG. 1, and shows a non-deformed free state before fitting.

Then, when the wheel damper 8 is fitted into the damper chamber 3, the state shown in the portion E is obtained. That is, since the press contact protrusion 27 is forced to be elastically deformed and the groove 28 is formed on the damper chamber inner side of the press contact protrusion 27, the press contact protrusion 27 falls inward of the damper chamber 3 and above the groove 28, and the partition wall 7 is broken. It is pressed against the inner surface. Therefore, a force F1 in the circumferential direction and a force F2 inward in the axial direction are generated at the pressure contact portion of the pressure contact protrusion 27 against the partition wall 7 due to the restoring elasticity of the pressure contact protrusion 27, and these are applied to the wheel damper 8. .

For this reason, the wheel damper 8 is less likely to fall out of the damper chamber 3, and the handling during the assembling work to the completed vehicle becomes easy. Moreover, due to the presence of the groove 28, the direction in which the pressing protrusion 27 falls can be reliably directed to the inside of the damper chamber 3.

Further, by providing this groove 28, when fitting into the damper chamber 3, it is possible to ensure the escape of the pressure-contacting projection 27 that has been volume-up, and the fitting operation itself becomes easier. Further, since there is an appropriate degree of freedom, a sufficient clearance can be secured during the work of mounting the driven flange 10, and the work of mounting can be performed easily.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the pressure contact protrusions 27 may be provided in the central portion without being moved to the outer surface side of the wheel damper 8. Further, it may be provided so as to come into contact with the inner surface of the outer peripheral portion 5 of the hub on the outer peripheral portion 23 or the outer surface of the axle tubular portion 4 on the inner peripheral portion 21 without being pressed into contact with the partition wall 7.

Further, the cross-sectional shape of the press-contact projection 27 can be variously modified, and for example, the tip may be rounded to simply project outward, or may be an arcuate step portion parallel to the general surface 29 in cross section. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a planar shape of a wheel damper according to an embodiment together with an enlarged rotational cross section of a main part.

FIG. 2 is an exploded perspective view of the wheel damper according to the embodiment.

FIG. 3 is an enlarged cross-sectional view taken along line CC of FIG.

FIG. 4 is a diagram showing the operation of the embodiment.

[Explanation of symbols]

2 ... Hub, 3 ... Damper chamber, 7 ... Partition wall, 8 ... Wheel damper, 10 ... Driven flange, 26 ... Partition wall pressure contact part, 27
… Pressing protrusions, 28… grooves

Claims (1)

[Scope of utility model registration request] 1. A wheel damper made of an elastic material, which is fitted in a damper chamber provided on a side surface of a hub of a wheel so as to open outward, and which cushions an impact force in a rotational direction due to driving from a sprocket. At the time of joining, at least a part of the fitting pressure contact portion that is pressed against and contacts the inner surface of the peripheral wall of the damper chamber is formed with a pressure contact protrusion projecting in the peripheral wall direction and extending in a direction orthogonal to the fitting direction, and at the base of the pressure contact protrusion. A wheel damper characterized in that a groove extending along the pressure contact projection is provided on the inner side of the damper.