JPH0231991A - Construction of wheel mounting for small-sized vehicle - Google Patents

Abstract

PURPOSE:To make it possible to dismount a rear wheel rearward or downward without removing such arrangements as an exhaust pipe, luggage compartment, body cover, etc. by forming an axle body so that it can be sunk in the direction opposite to a wheel and by making the axle body and a sleeve smaller and lighter. CONSTITUTION:To replace a tire, a nut 25 is removed and a rear wheel boss 22 is pulled out from a rear axle 19 rightward, then a rear wheel 20 can be pulled out from the rear axle 19 rightward. Since the left end of the axle 19 can be moved toward the recess 28 of a transmission cover located at the left side of the axle 19, the right end 19b of the axle 19 can be positioned at the same lateral position A as the top end of a pin 30 or 31 even if the right end 19b of the axle 19 is protruded from the front end of a support pin 30 or anchor pin 31 by an amount of B with the wheel 20 mounted. Since the distance X between the lateral position A and the left side surface 26a of an exhaust muffler 26a is equal to or slightly wider than the width of a tire 23. The wheel 20 can be removed, therefore, rearward from between the right end 19b of the rear axle and the top ends of the pins 30 and 31 and the left side 26a of the muffler, without removing the muffler 26.

Description

[Detailed description of the invention] The present invention has a power transmission mechanism on one side of a wheel that transmits driving force to the wheel, and is connected to the transmission mechanism so as to be integrally rotatable. In a small vehicle having wheels removably attached to the end of the axle, the power transmission 3! This relates to a structure in which the wheels can be easily attached and detached without being obstructed by objects such as exhaust pipes and storage compartments disposed on the opposite side of the mechanism.

As shown in FIG. 1 (see JP-A-62-149586), the width between the shaft 03 and the exhaust muffler 04 is smaller than A during the fitting of the axle 01 and the boss portion 02. In order to be able to handle the wheel 03 from the width axis 01 while narrowing the gap B, the final stage gear 06 of the gear reducer 05 and the center axis 0
A sleeve 07 is interposed between the sleeve 0 and the axle 01, and the axle 01 is fitted to the sleeve 07 via the spline 08.
7 is formed with a stopper 09 that prevents movement toward the wheel 03, that is, the exhaust muffler 04, and is formed by a head 010 of the axle 01 that engages with the sleeve 07 and a nut 011 screwed onto the tip of the axle 01. With this, insert the rear width shaft 03 into the sleeve 0.
There is one in which the rear wheel 03 is integrally drawn to the rear width axis 01 and engaged with the rear width axis 01.

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However, in the wheel mounting device shown in FIG. 1, the thrust force to the sleeve 09 is generated at the head of the width axis 04, so the wheel becomes long and it is necessary to form a thrust stopper 011 on the sleeve. As a result, processing is complicated and the number of mold tanks increases.

The present invention relates to an improvement of the wheel mounting structure of a small vehicle that overcomes such difficulties, and includes a power transmission mechanism on one side of the wheel for transmitting driving force to the wheel, and a power transmission mechanism that transmits driving force to the wheel. A wheel mounting structure for a small vehicle in which a wheel is removably mounted on an axle end that is integrally rotatably connected, wherein an axle main body is housed in the axle so as to be movable in the axial direction, and the axle main body and the power transmission mechanism are connected to each other. A sleeve portion is provided that allows the axle body to rotate integrally, a bearing portion is provided on the sleeve portion and the axle body, and a stopper portion is formed on the axle body to prevent movement toward the wheel. It is characterized by being able to be sunk into the opposite side of the wheels.

In the present invention, the axle is provided with a sleeve portion that accommodates the axle body movably in the axial direction and allows the axle body and the power transmission mechanism to rotate integrally, and the sleeve portion and the axle body each have a In addition to providing a bearing part, a stopper part is formed on the axle body to prevent it from moving toward the wheel, and the axle body can be sunk to the side opposite to the wheel, so the axle body and sleeve can be made smaller. Weight reduction can be measured. and when a fixing means such as a wheel nut for fixing the wheel to the axle is removed, the axle body is sunk to the side opposite to the wheel, and the tip of the axle body is moved toward the power transmission mechanism side. , Exhaust pipes and storage compartments located on the opposite side of the wheel from the power transmission mechanism.

The rear wheel can be removed rearward or downward without removing the vehicle body cover or other installed items.

Dog - Presentation 1 Hereinafter, one embodiment of the present invention illustrated in FIGS. 2 to 5 will be described.

The power unit 1 includes an engine (not shown), a V-belt continuously variable transmission 8!2 that changes the output of the engine, and a gear reducer 3 that reduces the output of the continuously variable transmission 2 and transmits it to the rear wheels 20. It is constructed by integrally incorporating the fifth
The left crankcase 4 of the power unit 1, the mission cover 5 to the left of the left crankcase 4, and the left crankcase 6 are shown assembled together in FIG. 6 and FIG.

Further, a driven shaft 7 is rotatably supported by the left crankcase 4 and the transmission cover 5 via a bearing 8, and this driven shaft 7 is connected to a driven fixed pulley 9. Driven movable pulley 10
and a centrifugal starting clutch 11 are arranged, and a driven fixed pulley 9 and a driven movable pulley 10 are connected to a belt 12.
The driven fixed pulley 9 and the driven movable pulley 10 are connected to a drive boolean (not shown) and the rotating shaft of the engine via a When the starting clutch 11 is in the connected state, the driven shaft 7 is driven to rotate.

Further, a driving gear 13 is located inside the left crankcase 4 and is integrally formed with the driven shaft 7, and an intermediate shaft 14 is rotatably arranged behind the driven wheel 7 and parallel to this.
．． The intermediate shaft 14 is pivotally supported by the mission cover 5 via a bearing 8, and a large-diameter intermediate driven gear 15 and a small-diameter intermediate drive gear 16 that mesh with the drive gear 13 are integrally formed.
A rear axle 19 is disposed further rearward of the intermediate shaft 14. A final stage hollow shaft 17 is spline-fitted to the left outer periphery of the rear axle 19, and a final stage gear 18 meshing with the intermediate drive gear 16 is connected to the final stage The final stage hollow shaft 17 and rear axle 19 are spline-fitted to the outer periphery of the stage hollow shaft 11, and are rotatably supported by the transmission cover 5 and the left crankcase 4 via bearings 8, respectively. When the shaft 7 is rotationally driven, it is decelerated through a gear reduction gear 1113, and the rear axle 19 is rotationally driven.

Furthermore, a boss 22 of a wheel hub 21 that is connected to the rear wheel 20 is spline-fitted to the rear axle 19, and a washer 24 is applied to the outer end surface of the boss 22. A nut 25 is screwed onto the wheel hub 21, and a tire 23 is mounted on the wheel hub 21, so that when the rear axle 19 rotates, the rear wheel 20 is driven to rotate integrally.

Moreover, an exhaust muffler 26 is disposed to the right of the rear axle 20, and the exhaust muffler 26 is connected to an exhaust boat of the engine (not shown) via an exhaust pipe 27.

The transmission cover 5 is formed with four parts 28 that are recessed toward the left crankcase cover 6 along the left extension line of the rear axle 19, and the nut 25 is disposed outside the threaded part 19a of the rear axle 19. When the rear axle 19 is pushed into the four parts 28, the outer end surface 19b of the rear axle 19
It is positioned on the same front and rear surface A as the tip of the support bin 30 or the tip of the anchor bin 31 of the brake cam 29.

Further, when the rear axle 19 is pushed into the recess 28, the distance
The tire 23 is positioned so that the width T is approximately equal to or slightly wider than the width T.

A rear fender 33 is attached to the rear and lower part of the body cover 32 disposed above the rear wheel 20 so as to be able to swing vertically.

That is, the structure for mounting the rear fender 33 is as shown in FIG. The rear fender 33 is integrally fixed to the bracket 36 with screws 37. Further, a screw 38 passing through the rear fender 33 is screwed onto the stay 34, and by removing this screw 38, the rear fender 33 can be raised rearward. Further, a claw 39 is attached to the front upper edge of the rear fender 33, and when the rear fender 33 is pushed down, the claw 39 engages with the body cover 32, preventing the rear fender 33 from swinging upward. ing.

In the embodiment shown in FIGS. 2 to 5, the rear fender 33 can be lifted upward by removing the screw 38 from the stay 34, but as shown in FIG. A spring 40 that urges the bracket 36 and the rear fender 33 downward may be interposed between the support @35 and the bracket 36, and the spring force of the spring 39 can be overcome and the rear fender 33 can be raised upward.

Since the embodiment shown in FIGS. 2 to 5 is constructed as described above, the boss 22, which also serves as a spacer, is spline-fitted to the rear width shaft 19, as shown in FIG. At the same time, the stepped portion 19c of the rear axle 19 and the washer 24. When clamped with the nut 25, the rear axle 19 and the rear wheel 20 move 1! It is positioned so that it cannot be moved.

In this state where the rear axle 19 and the rear axle 20 are positioned so that they cannot move in the axial direction, when the engine (not shown) starts and exceeds a predetermined rotation speed, the starting clutch 11 is connected and the rear axle 19 and the rear axle 20 are reduced in speed by a gear reduction l113 and driven to rotate, and the scooter type motorcycle 1 runs.

When replacing tie 17, loosen nut 25 and remove it.
When the boss 22 of the rear Φ wheel 20 is pulled out to the right from the rear skewer shaft 19, the rear wheel 20 can be handled to the right from the rear width shaft 19. In this case, the left end of the rear axle 19 can enter the recess 28 formed in the transmission cover 5 to the left of the rear axle 19, so even if the rear axle 20 is installed, the right end of the rear axle 19 Even if the surface 19b protrudes from the front end of the support bin 30 or the anchor bin 31 by an amount B, the right end surface 19b of the rear axle 19 can be located on the same front-rear surface A as the tip of the support bin 30 or the anchor bin 31, Since the distance X between this front and rear surface A and the left side surface 26a of the exhaust muffler 26 is approximately equal to the width T of the tire 23 or slightly wider than this, the rear width axis can be adjusted without removing the exhaust muffler 26. 19, the tips of the support bin 30 and the anchor bin 31, and the left side 26 of the exhaust muff 526
The rear wheel 20 can be taken out rearward from the space between

Also, insert a new tire 23 between the left end surface 19b of the rear axle 19 and the left side surface 26a of the exhaust muffler 26,
9 to the right, fit the boss 22 on the rear axle 19, screw the nut 25 onto the threaded part 19a, and tighten the nut 25. Inner race 8a and boss 22 of 19 pivot bearing 8
The rear wheel 20 can be integrally mounted on the rear axle 19 by strongly tightening the wheels, and the required tire replacement can be easily performed within a short time.

Furthermore, since it is only necessary to form the four parts 28 on the mission cover 5, the continuously variable transmission 2 and the gear reduction gear 613 can be reliably separated, and the left crankcase cover 6 has a hole for pulling out the rear width shaft 19. Since there is no need to provide a lid to cover this, the structure can be simplified and an increase in the number of parts can be avoided, resulting in cost reduction.

In the embodiment shown in FIGS. 2 to 5, the recess 28 is formed in the mission cover 5 so that the rear width shaft 19 can be retracted to the left. However, as shown in FIG.
5 and move the rear axle 19 to the final stage bottomed hollow sleeve 41.
When the rear axle 19 is pushed in deeply, the right end surface 19b of the rear axle 19 is positioned on the same front and rear surface A as the tip of the support bin 30 or the anchor bin 31.
1 may be formed into an elongated hollow sleeve 41 with a bottom, and substantially the same effects as in the embodiment described above can be obtained.

In this way, in the present invention, the wheel can be easily removed back and forth or up and down by simply recessing the axle to the opposite side of the wheel, and the axle mounting structure is also improved. Weight reduction can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional plan view of a main part of a conventional power unit swing type motorcycle, FIG. 2 is a perspective view illustrating an embodiment of a rear wheel attachment/detachment structure of a power unit swing type motorcycle according to the present invention, and FIG. Fig. 4 is a plan view of the 5its, Fig. 3 shows a state in which the rear axle is attached to the rear axle, and Fig. 4 shows a state in which the rear wheel is removed from the rear axle. FIG. 5 is a cross-sectional view of the vehicle body invasion portion, FIG. 6 is a cross-sectional view of another embodiment, and FIG. 7 is a longitudinal cross-sectional view of still another embodiment. 1...Power unit, 2...Continuously variable transmission, 3...
・Gear reducer, 4...Left crankcase, 5...
Mission cover, 6... Left crankcase cover, 7... Driven shaft, 8... Bearing, 9... Driven fixed pulley, 10... Driven movable pulley, 12...
V-belt, 1390. Drive tooth type, 14... intermediate shaft, 1
5... Intermediate driven gear, 1G... Intermediate drive gear, 17
...Final stage hollow shaft, 18...! l Final stage gear, 190
．．・Rear axle, 19C...stopper part, 20...rear wheel, 21...wheel hub, 22...boss, 23
...Tire, 240. . Washer, 25...Nut, 26...Exhaust muffler, 27
...Exhaust pipe, 28...Recess, 29...Rear brake cam, 30...Support bin, 31...Anchor bin, 32...Body cover, 33...Rear fender, 34... - Stay, 35... Support shaft, 36... Bracket, 37. 38... Screw, 39... Damper plate, 40... Spring, 41... Final stage bottomed hollow sleeve. Figure 2

Claims (1)

[Scope of Claims] A small vehicle having a power transmission mechanism on one side of a wheel for transmitting driving force to the wheel, and a wheel detachably attached to an axle end integrally rotatably connected to the transmission mechanism. In the wheel mounting structure, a sleeve portion is provided in the axle to accommodate the axle body movably in the axial direction and allow the axle body and the power transmission mechanism to rotate integrally, and the sleeve portion and the axle body A wheel for a small vehicle, characterized in that a bearing part is disposed on each of the wheels, a stopper part is formed on the axle body to prevent movement toward the wheel, and the axle body can be sunk to the side opposite to the wheel. Mounting structure.