JPH05330474A - Pivot tightening structure of motorcycle - Google Patents

Abstract

PURPOSE:To provide a pivot tightening structure of a motorcycle which can surely fix a rear arm to an engine, and stably secure the tightening axial force of a pivot. CONSTITUTION:The front sides 20a of a pair of right and left rear arms 20 are positioned between a pair of right and left rear arm brackets 18, a rear part of the engine 33 is positioned between the front sides 20a of a pair of right and left rear arms 20, a pivot 19 is passed through these, and a screw part 19a is formed to the tip part of this pivot 19, and at the same time, a stepped screw part 19b is formed to the head part of this pivot 19. The stepped screw part 19b of this pivot 19 is screwed in either of the rear arm brackets 18, a nut 111 is screwed in the screw part 19a which is projected from the other rear arm bracket 18 of this pivot 19. In addition, a nut 112 is screwed in the stepped screw part 19b which is projected from either of the rear arm brackets 18, giving a tightening axial force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pivot shaft tightening structure for a motorcycle in which a rear arm provided with rear wheels is pivotally supported on a vehicle body.

[0002]

2. Description of the Related Art In a motorcycle, the front side of a pair of left and right rear arms is located between a pair of left and right rear arm brackets, and the rear part of the engine is located between the front sides of the pair of left and right rear arms. Penetrate the pivot shaft and screw a nut onto the tip of the pivot shaft.
There is one that applies a tightening axial force to a pair of left and right rear arm brackets by a head of a pivot shaft and a nut.

[0003]

By the way, the front side of the pair of left and right rear arms is positioned between the pair of left and right rear arm brackets, and the rear portion of the engine is positioned between the front sides of the pair of left and right rear arms. However, in order to give a tightening axial force to the pair of left and right rear arm brackets with the head of the pivot shaft and the nut, the gap is set in each part in consideration of the assemblability. A pair of left and right rear arm brackets
It is necessary to bend the gap in the direction in which both approaches.

As described above, the pair of left and right rear arm brackets are bent by a gap in the direction in which they approach each other by tightening during assembly, so that the tightening axial force varies and stable and secure fixing is difficult. Is. Further, if the rear arm bracket has high rigidity, it becomes impossible to further secure the tightening axial force.

The present invention has been made in view of the above point, and the pivot shaft of a motorcycle can surely fix the rear arm and the engine and can stably secure the tightening axial force of the pivot shaft. The purpose is to provide a tightening structure.

[0006]

In order to solve the above-mentioned problems, a pivot shaft tightening structure for a motorcycle according to the present invention has a front side of a pair of left and right rear arms positioned between a pair of left and right rear arm brackets. In the pivot shaft tightening structure of the motorcycle, in which the rear part of the engine is positioned between the front sides of the pair of left and right rear arms, and the pivot shaft is pierced through the rear arms and tightened, a screw part is formed at the tip part of the pivot shaft. , A stepped screw part is formed on the head of the pivot shaft, the stepped screw part of the pivot shaft is screwed to one rear arm bracket, and a nut is attached to the screw part protruding from the other rear arm bracket of the pivot shaft. Screwing, and further, a nut is screwed on the stepped screw portion protruding from the one rear arm bracket to give a tightening axial force. It is characterized.

[0007]

According to the present invention, the front sides of the pair of left and right rear arms are positioned between the pair of left and right rear arm brackets, and the rear portion of the engine is positioned between the front sides of the pair of left and right rear arms, and the pivot shafts are attached to them. The stepped screw portion of the pivot shaft is screwed to one rear arm bracket and the nut is screwed to the screw portion protruding from the other rear arm bracket of the pivot shaft. And
A nut is screwed to the stepped screw part protruding from one of the rear arm brackets, and the nut screwed to the stepped screw part,
It is supported by applying a tightening axial force with a nut screwed to the screw part.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 is a side view of a motorcycle to which the present invention is applied, FIG. 2 is a plan view of the motorcycle, and FIG.
Is a side view of the rear part of the motorcycle, FIG. 4 is a plan view of the rear part of the motorcycle, FIG. 5 is a side view of the oil tank, FIG. 6 is a plan view of the oil tank, and FIG. 7 is a sectional view of the pivot shaft part.

In the drawings, reference numeral 1 is a vehicle body frame, a head pipe 2 thereof is provided with a steering shaft 3, and a front fork 4 is provided on the steering shaft 3. A front wheel 5 is supported on the lower part of the front fork 4, and a handle 6 is mounted on the upper part.

A main frame 7 extending rearward is connected to the head pipe 2, and a connecting portion between the head pipe 2 and the main frame 7 is reinforced by gussets 8 and 9. A pair of left and right rear frames 10 are connected to the rear portion of the main frame 7, and the rear frame 10 extends rearward and slightly downward, and then bends and extends rearward and slightly upward.
A reinforcing frame 11 is connected to the upper side of each of the rear frames 10, and a front side connecting portion of the reinforcing frame 11 is reinforced by gussets 12 and 13.

The front side of the head pipe 2, the main frame 7, the rear frame 10 and the reinforcing frame 11 are covered with a front upper cover 14 and left and right front side covers 15.

A front rear fender 16 and a rear rear fender 17 are provided between the rear frames 10 at the rear portions thereof.
Is provided. A rear arm bracket 18 is welded to the center of the rear frame 10, and a pivot shaft 19 is provided between the rear arm brackets 18. The pivot shaft 19 has a pair of left and right rear arms 20.
The front side 20a of the rear arm 20 is supported, and the rear side 2 of the rear arm 20 is
A rear wheel 21 is provided at 0b.

The tightening with the pivot shaft 19 is shown in FIG.
Is shown in. That is, in the figure, the support body 100 is welded to the left rear arm bracket 18, and the support body 101 is welded to the right rear arm bracket 18. A recess 100a is formed inside the support 100, and a collar 110 is arranged in the recess 100a.

The front sides 20a of the pair of left and right rear arms 20 are positioned between the pair of left and right rear arm brackets 18, and the front sides 20a of the pair of left and right rear arms 20 are further positioned.
The rear portion 33b of the engine 33, which will be described later, is positioned between the two, and the pivot shaft 19 is passed through them to be tightened.

The front side 20 of the pair of left and right rear arms 20
A cylindrical body 102 is provided in a through a rubber bush 103, and both sides thereof are covered with cover thrusts 104. A threaded portion 19a is formed on the tip of the pivot shaft 19, and a stepped screw portion 19 is formed on the head of the pivot shaft 19.
b is formed, and a hexagonal hole 19c is further formed in the head in the axial direction.

The pivot shaft 19 is inserted from the left in FIG. 5, the tool is applied to the hexagonal hole 19c and rotated to move the stepped screw portion 19b to the left rear arm bracket 18.
It is screwed to the support body 100. By this screwing of the pivot shaft 19, the stepped screw portion 19b pushes the front side 20a of the pair of left and right rear arms 20 and the rear portion 33b of the engine 33 rightward via the collar 110, and the support body of the right rear arm bracket 18 is supported. By abutting against 101, it is possible to absorb and eliminate the gaps of each part necessary for assembly.

The nut 1 is attached to the threaded portion 19a protruding from the rear arm bracket 18 on the right side of the pivot shaft 19.
11 is screwed, and the nut 111 and the stepped screw portion 19b apply a tightening axial force to the front sides 20a of the pair of left and right rear arms 20 and the rear portion 33b of the engine 33.

Further, the left rear arm bracket 18
Nut 112 is screwed to the stepped screw portion 19b protruding from the support 100 of the left and right rear arm brackets 1.
The front side 20a of the pair of left and right rear arms 20 is positioned between the two, and the front side 2 of the pair of left and right rear arms 20 is further positioned.
While the rear portion 33b of the engine 33 is positioned between 0a, the tightening axial force is applied to them by the total tightening torque of the nut 111 and the nut 112.

Therefore, the rear arm 20 and the engine 33 are
Can be securely fixed, and the pivot shaft 19
The tightening axial force can be stably secured. Further, the nut 112 screwed to the stepped screw portion 19b also serves as a retainer for the pivot shaft 19.

Between the pair of left and right rear arms 20, a front cross member 22 and a rear cross member 23 are welded to face each other downward, and the front cross member 22 and the rear cross member 23 facing each other are bracketed. 24
Are connected by. This bracket 24 has a mounting portion 25
The lower portion 26a of the rear cushion 26 is rotatably supported on the mounting portion 25 via the support pin 27, and the upper portion 26b of the rear cushion 26 is attached to the bracket 28.
Is rotatably provided via a support pin 29.

The bracket 28 is welded to a cross pipe 30 provided between the pair of left and right rear frames 10 and a cross pipe 31 provided between the reinforcing frames 11.

A bracket 32 is welded to the front side of each rear frame 10, and an upper portion 33a of an engine 33 is supported by the bracket 32 via a support pin 34.
The rear portion 33b of the engine 33 is the front side 20 of the rear arm 20.
It is supported by the pivot shaft 19 together with a. An exhaust pipe 35 is connected to a lower front portion of a cylinder 33c of the engine 33. The exhaust pipe 35 extends from the lower side of the engine 33 to the right rear side, and a silencer 36 is connected to the rear side of the exhaust pipe 35.

An intake pipe 37 is connected to the upper portion of the engine 33, a carburetor 38 is connected to the intake pipe 37, and an air cleaner 39 is connected to the carburetor 38. The air cleaner 39 is arranged between the pair of left and right rear frames 10, the air cleaner 39 extends upward, and air is sucked in through an intake port 39a opened rearward thereof.

A screw 40 is provided at the bottom of the air cleaner 39.
The screw 40 is fastened and fixed to the stay 42 provided on the cross pipe 41 with the nut 43. The cross pipe 41 is provided on the rear arm bracket 18. The upper portion of the air cleaner 39 is fastened and fixed to the bracket 44 with a screw 45.
4 is welded to the reinforcing frame 11 and the support pipe 46 welded to the reinforcing frame 11.

The reinforcing frame 11 also includes the engine 3
The CDI unit 47 for controlling the ignition timing of No. 3 is supported, and the rectifier regulator 48 is supported by the bracket 28. Further, a case 49 is fixed to the bracket 44, and the battery 5 is attached to the case 49.
0 is stored, and the battery 50 is held by the band 51.

A main oil tank 52 is connected along the right rear frame 10, and the main oil tank 5 is connected.
The rear part of 2 is connected to a sub oil tank 54 via an oil hose 53, and the sub oil tank 54 is arranged between the rear parts of the left and right rear frames 10. The oil injection portion 55 of the sub oil tank 54 is connected to the upper portion of the main oil tank 52 via an air vent hose 56.

A pin 57 is provided at the lower center of the main tank 52, and the pin 57 is provided on the right rear frame 1.
0 is supported by being inserted into a grommet 59 provided on the stay 58, the front upper part 52a is supported by the support tool 60 of the connecting frame 11, the rear upper part 52b is supported by the support tool 61 of the right rear frame 10, and the screws 62 are respectively provided. , 63, and fixed.

The upper and lower sides of the sub oil tank 54 are fastened and fixed to the bracket 64 provided between the pair of left and right rear frames 10 with screws 65 and 66. The oil hose 67 is on the front side of the main oil tank 52.
The oil hose 67 is connected to an oil pump 68 provided in the engine 33.

In this way, the main oil tank 52,
By dividing the sub oil tank 54 into two parts and connecting the oil hose 67 and the air vent hose 56 between them, the degree of freedom in the layout of the oil tank is increased, which allows the tank capacity, oil supply, design and manufacturing. The above constraints can be greatly improved.

A fuel tank 69 is disposed between the pair of left and right rear frames 10 and is located above the front-side rear folder 16. The front and rear sides of the fuel tank 69 are brackets 70 provided on the rear frame 10. Supported by. A supply pump 72 is connected to the front side of the fuel tank 69 via a fuel hose 71, and the supply pump 72 is connected to the carburetor 38 via a fuel hose 73.

The fuel tank 69 is arranged below the seat 74, and the injection portion 75 of the fuel tank 69 is located in the seat 7.
4 is located close to the bottom plate 76. The injection portion 75 of the fuel tank 69 is provided with a receiving tray 77 formed of, for example, a flexible rubber member, and a front side 77b of a side wall 77a rising above the receiving tray 77 is formed so as to be curved inward. ing.

The side wall 77a of the receiving tray 77 provided in the injection portion 75 of the fuel tank 69 rises straight upward, and receives the overflowing fuel.
Some height is secured. Therefore, the saucer 7
7 is located close to the bottom plate 76 of the seat 74, the front side 77b of the side wall 77a thereof is located at the bottom plate 7 of the seat 74.
Although it is pushed from above by 6, the front side 77b is bent inward so that it is prevented from being deformed by opening outward.
It is possible to prevent the fuel from adhering to the outside.

This tray 77 is used for the sub oil tank 54.
It is also used as a saucer. A discharge pipe 78 is connected to the front bottom of the tray 77. A hose 79 is connected to the discharge pipe 78, and a tip end portion 79a of the hose 79 is located at a rear position of the engine 33, and the fuel overflowing to the tray 77 is guided to the lower rear part of the engine 33 and discharged. ..

A bracket 80 is attached to the front side of the bottom plate 76 of the seat 74. The bracket 80 is rotatably supported by a stay 81 welded to the support pipe 46 via a support pin 82, and the seat 74 is supported. It can be opened and closed forward with the pin 82 as a fulcrum. This sheet 7
The bottom plate 76 of 4 is provided with dampers 83, 84, 85,
The front damper 83 is supported by the bracket 44 provided on the reinforcing frame 11, and the rear dampers 84, 85 are supported by the upper portion of the fuel tank 69.

On the rear portion of the bottom plate 76 of the seat 74, a fitting 8 is attached.
6 is attached, and this attaching tool 86 is a locking tool 8 for the bracket 64 provided between the pair of left and right rear frames 10.
It is locked at 7. The locking tool 87 is automatically locked by the mounting tool 86 of the seat 74 when the seat 74 is mounted, and the locking tool 87 is released by operating the lock key 88.

The lower front side of the seat 74 is covered with a rear front cover 89, both side portions of the seat 74 are covered with rear side covers 90, and the rear portions of both side rear side covers 90 are connected with a tail lamp cover 91. There is.

[0037]

As described above, in the structure for tightening the pivot shaft of the motorcycle according to the present invention, the threaded portion is formed at the tip end portion of the bot shaft and the stepped screw portion is formed at the head portion of the pivot shaft. , The stepped screw part of this pivot shaft is screwed to one rear arm bracket, and the nut is screwed to the screw part protruding from the other rear arm bracket of this pivot shaft,
Furthermore, since a nut is screwed onto the stepped screw part protruding from one of the rear arm brackets to give a tightening axial force, the stepped screw part of the pivot shaft and the nut are screwed onto the stepped part for assembly. It is possible to absorb and eliminate the required gaps in each part.

Further, the front side of the pair of left and right rear arms is positioned between the pair of left and right rear frame brackets, and the rear portion of the engine is positioned between them, and the tightening axial force is applied to them by the total tightening torque of the nut. Since it is given, the rear arm and the engine can be securely fixed, and moreover, the tightening axial force of the pivot shaft can be stably ensured.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a plan view of the motorcycle.

FIG. 3 is a side view of a rear portion of the motorcycle.

FIG. 4 is a plan view of the rear part of the motorcycle.

FIG. 5 is a side view of the oil tank.

FIG. 6 is a plan view of an oil tank.

FIG. 7 is a sectional view of a pivot shaft portion.

[Explanation of symbols]

 18 Rear Arm Bracket 19 Pivot Shaft 20 Rear Arm 33 Engine 19a Screw Part 19b Stepped Screw Part 111, 112 Nut

Claims (1)

[Claims] 1. Between a pair of left and right rear arm brackets,
In the pivot shaft tightening structure of the motorcycle, the front side of the pair of left and right rear arms is positioned, and the rear part of the engine is positioned between the front sides of the pair of left and right rear arms, and the pivot shaft is passed through these parts to tighten the pivot shaft. A screw is formed on the tip of the shaft, and a stepped screw is formed on the head of this pivot shaft.The stepped screw of this pivot shaft is screwed to one rear arm bracket, and the other of this pivot shaft is attached. Of the motorcycle, wherein a nut is screwed to the screw portion protruding from the rear arm bracket, and a nut is screwed to the stepped screw portion protruding from the one rear arm bracket to give a tightening axial force. Pivot shaft tightening structure.