JPH03178889A - Rear wheel supporting device for vehicle - Google Patents

Abstract

PURPOSE:To easily further promptly perform link mounting work of a rear wheel driving chain by mounting a fixing tool of bolts or the like, for fixing an axle case to a supporting hole, in the vicinity of the supporting hole of a swing arm and forming a groove, engaged with the fixing tool, in the peripheral surface of the axle case. CONSTITUTION:A rear free end part 1d in a rear end part 1c of a swing arm 1 is divided by a slit in a car body width direction, and an axle case 7, provided in a supporting hole 6, is suitably turned with a tool by loosening a fixing tool 29 of bolts or the like to change a position for a car body longitudinal direction of an axle 11, eccentrically provided in the case 7, with a condition of tension of a drive force transmitting chain adjusted. By again tightening the fixing tool 29 to fix the case 7 to the supporting hole 6, elongation of the drive force transmitting chain is compensated. Also since the fixing tool 29 is engaged with a groove 28b of the case 7, the case 7 is stopped from moving in the car body width direction, and the position alignment of the axle case 7 in the car body width direction can be accurately performed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention mainly relates to a rear wheel support device for vehicles such as motorcycles and tricycles, and particularly to a device for adjusting the tension of a chain that transmits driving force to the rear wheels. The present invention relates to a rear wheel support device for a vehicle suitable for

[Conventional technology]

In the case of funeral vehicles such as white moving two-wheeled vehicles and tricycles whose rear wheels are driven via a chain, it is difficult to use (because the chain stretches when the rear wheel is driven by a chain, for example, as shown in Jitsuma n? (No. 54-71354) , a long axle insertion hole is formed in the rear end of the swing arm in the longitudinal direction of the heavy body, and the axle that is passed through the axle 1ITI through hole is moved back and forth to adjust the tension of the chain,
It compensates for chain elongation.

[Problem to be solved by the invention]

However, with this configuration, the axle moves within the long hole when adjusting the tension of the chain, so the axle tends to tilt in the front-rear direction with respect to the swing arm. It is necessary to adjust and check the perpendicularity to the arm.

The present invention has been made in view of the above points, and an object of the present invention is to provide a rear wheel support device for a vehicle that can easily and quickly perform the work of tensioning a rear wheel drive chain.

[Means to solve the problem]

As a means for solving the above-mentioned problems, the present invention provides a swing arm whose front end is pivotally supported on a vehicle body frame so as to be able to swing vertically, and a driving force transmission chain connected to a rear wheel via an axle at the rear end of a swing arm. In the rear wheel support device for a vehicle that supports a sprocket on which the swing arm is suspended,
An axle case having a support hole extending through the vehicle body width direction and having an eccentric axle insertion hole is rotatably provided in the support hole,
A fixing device such as a bolt for fixing the axle case to the support hole is installed near the support hole of the swing arm, and a groove 12 is formed on the outer peripheral surface of the axle case to which the fixing device engages. .

[For production]

Therefore, when adjusting the tension of the chain, if the axle case, which is held movably in the support hole by loosening a bolt or other fixing device, is rotated by a tool, etc. The car is formed into 4itlln
The elongation of the chain is compensated for by moving the through hole in an arc in the longitudinal direction of the vehicle body, adjusting the tension of the chain, and fixing the axle case to the support hole again.

Furthermore, since the fasteners such as bolts are fully engaged with the axle case, the axle case is prevented from moving in the width direction of the vehicle body.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the vehicle rear wheel support device according to the present invention, which is applied to a cantilever swing arm that rotatably supports the rear wheel of a motorcycle, will be described below with reference to the drawings.

The swing arm 1 is a cantilever type consisting of a single arm cast with a hollow square cross-section.The swing arm 1 is of a cantilever type and consists of a single arm cast in a hollow shape with a rectangular cross section. 1a and lb are pivotally supported by support bins 3.3,
It is connected to the lower part 4 of one oil cylinder, which is a reaction, at a position on the center line of the vehicle body, and is arranged to be able to swing up and down using the support bins 3, 3 as fulcrums. This swing arm 1 extends rearward along this side of the vehicle body, bypassing a rear wheel 5 consisting of a rear wheel 5a disposed on the center line of the vehicle body and a tire 5b attached to the rear wheel 5a. There is.

A support hole 6 having a circular cross section is formed through the rear end IC of the swing arm 1 in the width direction of the vehicle body, and a cylindrical axle case 7 is provided in the support hole 6 so as to be rotatably and fixably held therein. There is. The axle case 7 has an axle insertion hole 8 on an axis C2 that is eccentric by E with respect to the axis C1 of the axle case 7. The axle case 7 has protrusions 7a and 7b protruding from the support hole 6, and the axle tart of the right protrusion 7a.
A ball bearing 9 for supporting the axle is fitted into the through hole 8, and a needle bearing 10 for supporting the axle is fitted into the axle insertion hole 8 of the left protrusion 7b.

An axle 11 is inserted into the axle insertion hole 8 and is rotatably supported by the two bearings 9 and 10 for supporting the axle, and both ends of the axle 11 extend from the axle case 7.

A spline m 1 is provided on the outer peripheral surface of the right end of the axle 11.
1a, a threaded groove 11b is formed on the outer end thereof, and a spline groove 110 is formed on the outer peripheral surface of the left end.

The spline on the right end of the axle 11? A hub 12 is attached to M 11 a by spline engagement with a boss portion 12 a at the center thereof, and is detached by a nut 13 screwed into a threaded groove 11 b. The right end portion is the boss portion 12a of the hub 12.
It is supported by a ball bearing 9 via.

A brake disc 14 is provided on the periphery of the inner surface of the hub 12 (the surface facing the swing arm 1), and a brake disc 14 is provided on the periphery of the outer surface of the hub 12.
The rear wheel 5a of the rear wheel 5 has a plurality of disc bolts 1
It is attached by 5.

That is, the disc bolt 15 is attached to the brake disc 14 and the rear wheel 5 on the outer peripheral surface of the base of the flat head 15.1.
A knurled portion 15b having a length corresponding to the thickness of a is formed, and a male threaded portion 15c is formed following the knurling all 1 portion 15b. Then, insert this disc bolt 15 from the swing arm 1 side into the bolt hole of the brake disc 14, the mounting hole 12b drilled on the peripheral edge of the hub 12, and the mounting hole of the rear wheel 5a, and then insert the knurled portion 15b. The brake disc 14 is fixed to the inner surface of the hub 12 by being press-fitted into the mounting hole 12b, and the rear wheel 5a is fixed to the outer surface of the hub 12 by a taper nut 6 screwed into the male threaded portion 15c.

A caliper 17 is disposed near the peripheral edge of the brake disc 14 between the swing arm 1 and the rear wheel 5a so as to be able to pinch the braking surface of the brake disc 14 from both sides. The caliper 17 has a bracket 18 formed integrally or separately, and an annular base 18a of the bracket 18.

The caliper 17 is rotatably mounted on the axle case 7 by being attached to the outer periphery of the protrusion 7a of the axle case 7, and is attached to the caliper stopper bolt 19 protruding from the right side of the swing arm 1. It engages with a stopper collar 20 mounted thereon, thereby restricting rotation due to the action of braking torque.

The spline on the left end of the axle 11? A driven flange 21 is attached to the P111c by spline engagement with a boss portion 21a at its center, and is further prevented from coming off by a retaining member 22. The driven flange 21 has a plurality of engagement arms 21 radially arranged around the outer circumference of the boss portion 21 a. b, a large-diameter cylindrical bracket support portion 21c is integrally formed on the swing arm 1 side of the boss portion 21a, and a housing support portion 21d is integrally formed on the side of the boss portion 21a opposite to the swing arm 1.

The housing support portion 21d of the driven flange 21 includes
A deep III-shaped damper housing 22 is rotatably supported via a bushing 23, and a disc-shaped sprocket bracket 2 is mounted on the bracket support portion 21c.
4 is supported via a bushing 25 on the self-acting motor.

The damper housing 22 has partition walls 22a extending from the inner periphery of the four parts toward the center and are formed radially in the same number and at the same intervals as the engagement arms 21b of the driven flange 21. 21
The outer peripheral edge 22 of the engaging arm 21b is covered with
b is in contact with the sprocket bracket 24 on the side opposite to the swing arm 1.

An annular driven sprocket 26 is arranged on the swing arm 1 side surface of the sprocket bracket 24, and the driven sprocket 26 passes through the peripheral edge of the sprocket bracket 24 from its bolt hole to the damper housing. The damper housing 22 is integrally aligned with the sprocket bracket 24 by a mounting bolt 27 whose tip end is screwed into a tapped hole formed on the outer peripheral edge 22b of the driven sprocket 26. The sprocket bracket 24 and the damper housing 22 are rotatably provided until the partition wall 22a engages with the engagement arm 21b.

A driving force transmission chain (not shown) is suspended between the driven sprocket 26 and a drive sprocket (not shown) attached to an output shaft of a transmission gear mechanism of an engine provided in the vehicle body.

An axle case 7 is provided so as to be movably and fixably held in the support hole 6 of the rear end portion 1c of the swing arm 1, and is provided in the rear free end portion 1d of the rear end portion 1c in the vertical direction of the vehicle body. It is installed with rotation restricted by a fixing device 29 such as a bolt that is installed in a mounting hole 28, and the fixing device 29
By removing the restriction and rotating the axle case 7,
The position of the axle insertion hole 8, which is provided eccentrically in , by fixing the axle case 7 to the support hole 6, the elongation of the drive force transmission chain is compensated for. The middle part of the mounting hole 28 is a '/R28a that opens toward the support hole 6 formed at the rear end 1c, while the middle part of the mounting hole 28 is a '/R28a' opening on the side of the support hole 6 formed at the rear end 1c. A groove 28b having a predetermined length in the circumferential direction or having an annular shape is formed in a portion facing M28a,
The side bays 28a and 28b form a passageway for two fixing devices such as bolts.

For example, as is well known, the rear free end 1d of the rear end IC of the swing arm 1 is divided by a slit in the width direction of the vehicle body. By appropriately rotating the axle case 7 provided inside the axle case 7 with a tool, the position of the axle 11, which is provided eccentrically on the axle case 7, in the longitudinal direction of the vehicle is changed, and the tension of the driving force transmission chain is adjusted. By re-fastening the fixture 29 and fixing the axle case 7 to the support hole 6, the elongation of the drive force transmission chain is compensated for.

In addition, since the two fixing devices are engaged with the groove 28b of the axle frame, the axle case 7 is prevented from moving in the radial direction of the vehicle body, and the axle case 7 can be rotated with respect to the swing arm 1. Even with a +M size, the center shaft case 7 can be accurately aligned in the width direction of the vehicle body.

Further, since the bearings 9 and 10 for supporting the axle are disposed in the protrusions 7a and 7b protruding from the support hole 6 of the axle case 7, the support hole 6 is secured to the axle case 7 by the two fixing devices. Even if you tighten it, it will not receive the force directly, so
It does not affect the rotation of the axle 11.

On both sides of each wall 22H of the damper housing 22, block-shaped damper levers 30, 31 that act as torque buffers are installed on the engagement arms of the driven flange 21 disposed within the damper housing 22. 21b
and the partition wall 22a. The damper lever 30 and the damper lever 31 have different sizes, and the driven sprocket 26 and the driven sprocket 26, which rotate at the same time as the engine power is transmitted through the driving force transmission chain according to the traveling distance of the vehicle, are different in size. A thick and large damper rubber 30 is provided on the rotation direction (direction of the arrow in FIG. 3) side of the partition wall 22a of the damper housing 22, and a damper rubber 31 that is thinner and smaller than the damper rubber 30 is provided on the opposite rotation direction. Driven sprockets 26 are provided so as to substantially fill the respective spaces, and are used for power transmission.
The partition wall 22a of the damper housing 22, which rotates integrally with the driven sprocket 26, controls the rotation of both damper rubbers 30 through the thick and large damper rubber 30 during forward movement and through the thin and small damper rubber 31 during backward movement.
．． 31 is configured to buffer the torque and transmit it to the engagement arm 21b of the driven flange 21, thereby rotating the axle shaft 11 that is spline-engaged with the driven flange 2.

Therefore, when a rider on a moving two-wheeled vehicle starts the engine, switches the transmission gear mechanism from the neutral state to an appropriate position such as low gear, and connects the clutch, the drive sprocket is moved and the transmission of power is transmitted via the driving force transmission chain. The driven sprocket 26 is rotationally driven. When the driven sprocket 26 rotates, the damper housing 22 also rotates, and each partition wall 22a of the damper housing 22 pushes each engagement arm 21b of the driven flange 21 pivotally attached to the axle 11 via the damper rubber 29. The damper lever 29 buffers the sudden torque transmission between the latch connections, enabling smooth starting, and also reduces the shock when shifting gears to second gear, third gear, etc. while driving, resulting in good gear shifting. The feeling is ensured.

Furthermore, since the driven sprocket 25 is arranged close to the swing arm 1, the stress acting in the direction of twisting the swing arm 1 when transmitting driving force is reduced, making it possible to make the swing arm smaller and lighter. .

Furthermore, the swing arm 1 of this embodiment has the advantage that maintenance work such as replacing the rear wheel 5, which is a military wheel, and replacing the brake disc can be easily performed by adopting a cantilever type.

Incidentally, above the outer side of the rear wheel 5, a rear part of a muffler 32 disposed along the right side of the vehicle body is ductile.

Furthermore, although this embodiment has been described with respect to a cantilevered swing arm of a motorcycle, the vehicle rear wheel support device according to the present invention can be suitably implemented in other vehicles such as a tricycle.

[Effect of understanding]

As explained above, the rear wheel support device for a vehicle according to the present invention has a front end on the service frame which is pivotally supported for vertical swinging, and a rear wheel connected to the rear end of the swing arm via the axle. In a rear wheel support device for a vehicle that supports a subrono gamma seat on which a driving force transmission chain is suspended, a support hole is formed in the rear end of the swing arm m1 in the direction of the vehicle body width Jj to prevent an eccentric car! A width shaft case with a width H of the ventilation hole is rotatably provided in the support hole, and a fixing device such as a bolt for fixing the case to the support hole is installed near the support hole of the swing arm, Since a groove is formed on the outer peripheral surface of the axle case in which the fixing tool engages, when adjusting the tension of the chain,
The width axle case is rotatable relative to the support hole, and when the axle case is rotated with a tool, the axle and sprocket eccentrically installed on the axle case move in the longitudinal direction of the vehicle body while drawing a placement plate. By moving, adjusting the tension of the drive force transmission chain, and fixing the axle case against the support hole again, the elongation of the chain is compensated for.
There is no need to adjust or check the perpendicularity of the axle to the swing arm each time the chain is stretched, making it easy to tension the rear wheel drive chain. However, even if the axle case is structured so that it can move in tandem with the swing arm, the fixing device such as a bolt may engage the groove of the axle case and prevent the axle case from moving in the width direction of the vehicle body. , the axle case can be precisely aligned in the vehicle width direction.

[Brief explanation of drawings]

The figures show one embodiment of the rear wheel support device for a vehicle according to the present invention, in which FIG. The figure is a sectional view taken along the line ■-■ in FIG. 1- Swing arm, 5... Rear wheel, 6... Support hole, 7... Axle case, 8... Axle insertion hole, 9...
Ball bearing, 10... Needle bearing, 1
1...Car N+, 26...Driven sprocket, 2
8...Mounting hole, 2roa 28b...full, 29...
・Fixing device patents issued by Hon IH Giken Kogyo Co., Ltd. 1
1st generation patent attorney
Kido-4 Ogawa
Shinshin I Zuban 2

Claims (1)

[Claims] 1. A rear wheel and a sprocket on which a driving force transmission chain is suspended are supported via an axle at the rear end of a swing arm whose front end is pivotally supported on the vehicle body frame so as to be able to swing up and down. In the rear wheel support device for a vehicle, a support hole is formed in the rear end of the swing arm in the width direction of the vehicle body, and an axle case having an eccentric axle insertion hole is rotatably provided in the support hole, A vehicle characterized in that a fixing device such as a bolt for fixing the axle case to the support hole is installed near the support hole of the swing arm, and a groove is formed on the outer circumferential surface of the axle case to which the fixing device engages. rear wheel support device. 2. The axle case has a cylindrical shape having a protrusion protruding from the support hole, and a bearing for supporting the axle is disposed in the protrusion.
A rear wheel support device for a vehicle as described in . 3. The rear wheel support device for a vehicle according to claim 1, wherein the swing arm consists of one arm and is of a cantilever type with the rear wheel supported on one side of the axle. .