JPH0688549B2 - Rear wheel support device for cantilever type vehicle - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a rear wheel supporting device for a cantilever type vehicle such as a motorcycle, a tricycle, etc., and particularly to a chain tension for transmitting a driving force to the rear wheels. The present invention relates to a rear wheel support device for a cantilever type vehicle, which is suitable for adjusting the condition.

[Conventional technology]

In a vehicle such as a motorcycle which drives the rear wheels through a chain, the chain extends according to the specifications, so that, for example, as shown in Japanese Utility Model Publication No. 54-71354, a rear end of a swing arm is used. Form a long axle insertion hole in the front-back direction of the vehicle body,
Move the axle inserted through this axle insertion hole back and forth,
The tension of the chain is adjusted to compensate for the elongation of the chain.

[Problems to be Solved by the Invention]

However, in such a configuration, when adjusting the tension of the chain, the axle moves in the long hole, so that the axle tends to tilt in the front-rear direction with respect to the swing arm, and the swing of the axle is changed every time the chain is stretched. It is necessary to adjust and check the verticality of 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 cantilever type vehicle that can easily perform a tensioning operation of a rear wheel drive chain.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention provides an axle rotatably supported by at least a pair of axle supporting bearings at a rear end portion of a swing arm whose front end portion is pivotally supported by a body frame in a vertically swingable manner. In a rear wheel supporting device for a cantilever type vehicle, the rear wheel is provided on one side and the sprocket on which the driving force transmission chain is suspended is provided on the other side. An axle case having a eccentric axle insertion hole penetrating in the direction is provided so as to be rotatable and fixed in the support hole, and a protrusion protruding from the support hole is provided on the rear wheel side of the axle case with the axle. One of the bearings is formed concentrically, and one of the bearings is arranged on the inner circumference of the protrusion, and the annular base of the caliper-supporting bracket is rotatable at the outer peripheral position of the protrusion corresponding to the bearing. Fitting the bra The swing arm non-rotatably supported, the brake disc is fixed to the inside position of the rear wheel of the axle, and the rear wheel is arranged in proximity so as to cover the caliper, the caliper supporting bracket, and the brake disc. It is characterized by that.

[Action]

Therefore, when adjusting the tension of the chain, if the axle case rotatably held in the support hole is rotated by a tool etc., the axle insertion hole eccentrically formed in the axle case draws an arc. While moving in the front-back direction of the car body,
By adjusting the tension of the chain and fixing the axle case to the support hole again, the elongation of the chain is compensated. Further, during the tensioning work of the chain, the relative positional relationship between the caliper and the brake disc is maintained without any trouble, and the tensioning work can be performed quickly.

〔Example〕

An embodiment of a rear wheel support device for a cantilever type vehicle according to the present invention applied to a motorcycle will be described below with reference to the drawings.

The swing arm 1 is a cantilever type having one arm cast in a hollow shape having a square cross section, and has a swing arm support portion 2 formed on the left and right sides of a body frame in a bifurcated front end portion. 1a and 1b are pivotally supported by support pins 3 and 3 and are connected to the lower portion 4 of one oil cylinder which is a rear cushion at a position on the center line of the vehicle body, and the support pins 3 and 3 are used as fulcrums to swing up and down. It is movably arranged. The swing arm 1 includes a rear wheel 5 including a rear wheel 5a arranged on the center line of the vehicle body and a tire 5b attached to the rear wheel 5a.
And extend rearward along the left side of the vehicle body to the rear end 1c
It is a cantilever type in which the rear wheel 5 is supported on one side via an axle 11 described later.

A supporting hole 6 having a circular cross section is provided at the rear end 1c of the swing arm 1.
Is formed so as to penetrate in the width direction of the vehicle body, and is provided so as to rotatably and fixedly hold a cylindrical axle case 7 in the support hole 6. The axle case 7 has an axle insertion hole 8 on an axis C _{2 which} is eccentric by E with respect to the axis C ₁ of the axle case 7. The axle case 7 projects cylindrical protrusions 7a, 7b from the support hole 6, and a ball bearing 9 for axle support is provided on the left side in the axle insertion hole 8 on the inner periphery of the right protrusion 7a. Needle bearings 10 for axle support are fitted and arranged in the axle insertion holes 8 on the inner periphery of the portion 7b. The protrusions 7a, 7b are concentric with the axle 11 fitted in the axle insertion hole 8.

The axle 11 fitted in the axle insertion hole 8 is rotatably supported by the bearings 9 and 10 for axle support, and both ends of the axle 11 extend from the axle case 7. A spline groove 11a and a thread groove 11b are formed on the outer peripheral surface of the right end portion of the axle 11, and a spline groove 11c is formed on the outer peripheral surface of the left end portion.
Are formed respectively.

The hub 12 is provided in the spline groove 11a at the right end of the axle 11.
Is attached by spline-engaging the boss portion 12a at its center, and the nut 1 screwed into the thread groove 11b.
It is provided so as not to come off by 3, and the right end portion of the axle 11 is supported by the ball bearing 9 via the boss portion 12a of the hub 12.

A brake disc 14 is attached to the peripheral portion of the inner surface (opposing surface of the swing arm 1) of the hub 12, and a rear wheel 5a of the rear wheel 5 is attached to the peripheral portion of the outer surface by a plurality of disc bolts 15. .

That is, the disc bolt 15 forms a knurled portion 15b having a length corresponding to the thickness of the brake disc 14 and the rear wheel 5a on the outer peripheral surface of the root of the flat head portion 15a, and continues to the knurled portion 15b. To form a male screw portion 15c. The disc bolt 15 is inserted from the swing arm 1 side into the bolt hole of the brake disc 14, the mounting hole 12b formed in the peripheral portion of the hub 12 and the attachment hole of the rear wheel 5a, and the knurled portion 15b is inserted. The brake disc 14 is press-fitted into the mounting hole 12b to fix the brake disc 14 to the inner surface of the hub 12, and the rear wheel 5a is fixed to the outer surface of the hub 12 by the taper nut 16 screwed to the male screw portion 15c.

A caliper 17 is arranged between the swing arm 1 and the rear wheel 5a in the vicinity of the peripheral edge of the brake disc 14 so that the braking surface of the brake disc 14 can be pressed from both sides. In the caliper 17, a bracket 18 is formed integrally or separately, and an annular base portion 18a of the bracket 18 is attached to an outer peripheral position of a protruding portion 7a of the axle case 7 corresponding to the ball bearing 9 so as to rotate. By being movably attached, the caliper 17 is rotatably held by the axle case 7 and engages with the stopper collar 20 mounted on the caliper stopper bolt 19 protruding from the right side surface of the swing arm 1, The bracket 18 is non-rotatably supported, and its rotation is restricted by the action of the braking torque.

The rear wheel 5 is disposed in close proximity so as to cover the caliper 17, the bracket 18 for supporting the caliper, and the brake disc 14. Thus, the bracket 18 for supporting the caliper is attached to the axle 11
It is rotatably held by the projecting portion 7a which is concentric with and is non-rotatably supported by the swing arm 1.
7, caliper support bracket 18 and brake disc
When the axle 11 is placed close to cover 14, the force from the road surface at the time of braking does not separate in the rear wheel direction and is almost in the same plane via the caliper 17 and the brake disc 14 through the axle 11, the axle case 7 and the swing. Efficiently transmitted to arm 1,
It is advantageous for torsional stress, and not only can it be made lighter by that amount, but it also contributes to the reduction of unsprung load.

A driven flange 21 is attached to the spline groove 11c at the left end of the axle 11 by spline engaging a boss portion 21a at the center thereof, and is further provided with a retaining member 22 to prevent the driven flange 21 from coming off. The driven flange 21 is
A plurality of engagement arms 21b are radially arranged on the outer periphery of the boss portion 21a, a large-diameter cylindrical bracket support portion 21c is provided on the swing arm 1 side of the boss portion 21a, and a housing support portion 21d is provided on the side opposite to the swing arm 1 of the boss portion 21a. Are integrally formed.

A deep bowl-shaped damper housing 22 is rotatably supported by a housing support portion 21d of the driven flange 21 via a bush 23, and a disc-shaped sprocket bracket 24 is provided on the bracket support portion 21c. Bush 25
It is rotatably supported via.

In the damper housing 22, partition walls 22a extending from the inner periphery of the recess toward the center are radially formed at the same number and at the same intervals as the plurality of engaging arms 21b of the driven flange 21, and the damper housing 22 includes the driven flange 21. Engaging arm 21
The outer peripheral edge 22b is in contact with the surface of the sprocket bracket 24 opposite to the swing arm 1 so as to cover b.

An annular driven sprocket 26 is disposed on the surface of the sprocket bracket 24 on the swing arm 1 side, and the driven sprocket 26 penetrates the peripheral edge portion of the sprocket bracket 24 from its bolt hole to form a damper housing. Bracket for the sprocket with the mounting bolt 27 with the tip side screwed into the screw hole formed on the outer peripheral edge 22b of 22.
The damper housing 22 is integrally fastened to 24, and the driven sprocket 26, the sprocket bracket 24, and the damper housing 22 are rotatably provided until the partition wall 22a is engaged with the engagement arm 21b. There is.

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

The axle case 7 provided so as to be rotatably and fixedly held in the support hole 6 of the rear end portion 1c of the swing arm 1,
The rear free end 1c is attached to the rear free end 1d while being restricted in rotation by a fixture 29 such as a bolt mounted in a mounting hole 28 provided in the vehicle body vertical direction. By releasing and rotating, the position of the axle insertion hole 8 eccentrically provided in the axle case 7 is displaced, the position of the axle 11 in the vehicle front-rear direction is changed, and the tension of the drive force transmission chain is adjusted. The extension of the driving force transmission chain is compensated by fixing the axle case 7 to the support hole 6 by restricting it again with the fixture 29. The middle portion of the mounting hole 28 serves as a groove 28a that opens toward the support hole 6 formed at the rear end 1c, while the groove 28a on the outer peripheral surface of the axle case 7 is provided.
A portion of the groove 28 having a predetermined circumferential length or an annular groove 28
b is formed, and both grooves 28a, 28b allow the fixture 29 such as a bolt to be formed.
Forming an insertion part of the.

Then, for example, the rear free end 1d of the rear end 1c of the swing arm 1 is divided by a slit in the width direction of the vehicle body, as is well known, and a fixture 29 such as a bolt is loosened to support the inside of the support hole 6. By rotating the axle case 7 provided in the vehicle with a tool as appropriate, the position of the axle 11 eccentrically provided on the axle case 7 in the vehicle front-rear direction is changed, the tension of the drive force transmission chain is adjusted, and the fixing is performed. By refastening the tool 29 and fixing the axle case 7 to the support hole 6, the extension of the driving force transmission chain is compensated.

Further, the bearings 9 and 10 for supporting the axle are arranged in the projecting portions 7a and 7b protruding from the support hole 6 of the axle case 7, so that the support hole 6 tightens the axle case 7 by the fixing tool 29. Even if it is raised, it does not receive the force directly, so it does not affect the rotation of the axle 11. Moreover, the protrusions 7a and 7b of the axle case 7 that protrude beyond the width of the swing arm 1 allow the axle 11
Since the bearings 9 and 10 support the width of the axle 11, the width of the swing arm 1 can be narrowed and the structure of the swing arm 1 can be narrowed. Can be configured.

Further, as described above, the caliper supporting bracket 18
Is rotatably held by the protruding portion 7a concentric with the axle 11, and is non-rotatably supported by the swing arm 1. Therefore, when the chain is stretched, the caliper 17 and the brake disc 14 are The relative positional relationship is maintained and the tensioning work can be performed quickly.

On both sides of each partition wall 22a of the damper housing 22, block-shaped damper bars 30, 3 functioning as a torque damping device are provided.
1 is provided in each space formed between the engaging arm 21b of the driven flange 21 disposed in the damper housing 22 and the partition wall 22a. The damper bar 30 and the damper bar 31 are different in size, and the partition of the damper housing 22 that rotates integrally with the driven sprocket 26 that rotates by transmitting the power of the engine through the driving force transmission chain when the vehicle is running. On the side of the wall 22a that rotates (in the direction of the arrow in FIG. 3), a thick and thick damper bar is provided.
30 and a damper parabar 31 that is thinner and smaller than the damper parabar 30 on the side opposite to the rotation direction are provided so as to substantially fill the space, and the driven sprocket during power transmission.
By means of the partition wall 22a of the damper housing 22 that rotates integrally with the driven sprocket 26, the rotation of 26 is performed through the thick and large damper bar 30 when moving forward and through the thin and small damper bar 31 when retracting, and the damper bars 30 The elasticity of 31 and 31 buffers the torque to transmit the torque to the engagement arm 21b of the driven flange 21, and the axle 11 spline-engaged with the driven flange 21 is rotated.

Therefore, when a rider on a motorcycle 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 rotated and the drive force transmission chain is used. The driven sprocket 26 is rotationally driven. When the driven sprocket 26 rotates, the damper housing 22 also rotates and each partition wall of the damper housing 22 rotates.
22a pushes each engagement arm 21b of the driven flange 21 axially attached to the axle 11 via the damper bar 30 respectively, and the damper bar 30 buffers torque transmission at the time of abrupt clutch engagement to smoothly start the vehicle. It also makes it possible to reduce shocks to the second gear, third gear, etc., during running, and to ensure a good gearshift feeling.

Further, since the driven sprocket 26 is arranged at a position close to the swing arm 1, the stress acting in the twisting direction of the swing arm 1 at the time of transmitting the driving force becomes small, and the swing arm can be made small and lightweight. .

Further, by adopting the cantilever type swing arm 1, there is an advantage that maintenance work such as replacement of the rear wheel 5 which is a drive wheel and replacement of a brake disc can be easily performed.

A rear portion of the muffler 32 arranged along the right side surface of the vehicle body extends above the outer side of the rear wheel 5.

Further, although the present embodiment has been described with respect to a motorcycle, the vehicle rear wheel support device according to the present invention can be suitably implemented in other vehicles such as a motorcycle.

〔The invention's effect〕

The vehicle rear wheel support device of the present invention, as described above,
The rear wheel is rotatably supported on the rear end of a swing arm whose front end is swingably supported on the body frame by at least a pair of axle supporting bearings, and the rear wheel is on the other side. A sprocket on which a driving force transmission chain is suspended is provided, and a support hole is formed through 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 rotated around the support hole. Further, it is provided so as to be fixable, and a projecting portion projecting from the support hole is formed concentrically with the axle on the rear wheel side of the axle case, and one of the bearings is arranged on the inner circumference of the projecting portion. An annular base portion of a bracket for supporting a caliper is rotatably fitted to an outer peripheral position of the protrusion corresponding to the bearing, and the bracket is non-rotatably supported by the swing arm, and a rear wheel of the axle. Inward position Since the brake disc is fixed and the rear wheel is arranged close to the caliper, the bracket for supporting the caliper, and the brake disc, when the tension of the chain is adjusted, the axle case is rotated by a tool or the like. The eccentrically mounted axle and sprocket move in the front-rear direction of the vehicle while drawing an arc, adjust the tension of the drive force transmission chain, and fix the axle case to the support hole again Since the elongation of the chain is compensated, it is not necessary to adjust and check the verticality of the axle with respect to the swing arm each time the chain is stretched, and the rear wheel drive chain can be stretched easily. Further, during the tensioning work of the chain, the relative positional relationship between the caliper and the brake disc is maintained without any trouble, and the tensioning work can be performed quickly.

Moreover, a bearing for axle support is arranged on the inner circumference of the rear portion of the axle case protruding from the support hole of the swing arm, and an annular base portion of the bracket for supporting the caliper is provided at the outer peripheral position of the protrusion corresponding to the bearing. Since the bearing is mounted so as to be rotatable, the bearing for axle support and the annular base of the caliper support bracket radially overlap with each other through the protrusion, and the width of the vehicle body can be reduced correspondingly, and the thickness of the protrusion is increased. Since the thickness of the annular base portion is added to, the rigidity can be secured without increasing the thickness of the protruding portion in the radial direction, and the weight of the axle case can be reduced.

[Brief description of drawings]

1 shows an embodiment of a rear wheel support device for a cantilever type vehicle according to the present invention. FIG. 1 is a sectional plan view of a swing arm portion, and FIG. 2 is an enlarged view of a main part of FIG. Figure 3 is II of Figure 2
It is an I-III sectional view. 1 ... Swing arm, 5 ... Rear wheel, 6 ... Support hole, 7
...... Axle case, 7a, 7b ...... Projection part, 8 ...... Axle insertion hole, 9 ...... Ball bearing, 10 ...... Needle bearing, 11 ...... Axle, 14 ...... Brake disc, 17 ...... Caliper, 18 ... … Brackets for supporting calipers, 18a …… Annular base, 26 …… Drivance sprocket

Claims (1)

[Claims] 1. A rear wheel on one side of an axle rotatably supported by at least a pair of axle supporting bearings on a rear end of a swing arm whose front end is pivotally supported on a body frame so as to be vertically swingable. In the rear wheel support device for a cantilever vehicle, each of which has a sprocket on which the driving force transmission chain is suspended on the other side, in the rear end portion of the swing arm, a support hole is formed so as to penetrate in the vehicle width direction, An axle case having an eccentric axle insertion hole is rotatably and fixedly provided in the support hole,
On the rear wheel side of the axle case, a protrusion protruding from the support hole is formed concentrically with the axle, and one of the bearings is arranged on the inner circumference of the protrusion and corresponds to the bearing. An annular base portion of a caliper supporting bracket is rotatably fitted to the outer peripheral position of the projecting portion, the bracket is non-rotatably supported by the swing arm, and a brake disc is provided at a rear wheel inner position of the axle. And a rear wheel supporting device for a cantilever type vehicle, wherein the rear wheel is arranged in close proximity so as to cover the caliper, the caliper supporting bracket, and the brake disc.