JP3154164B2 - Motorcycle engine support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine support structure for a motorcycle in which an engine is securely tightened and fixed to a vehicle body frame.

[0002]

2. Description of the Related Art In general, a method of supporting an engine on a vehicle body frame in a motorcycle is to interpose an engine support portion between brackets on a vehicle body frame disposed on the left and right sides, and insert a support bolt so as to penetrate the entire body.
A nut is screwed into the end of the support bolt and tightened up.

[0003] However, in recent motorcycles, the body frame is increased in rigidity in accordance with the enhancement of its performance, and the high rigidity hinders the engine from being tightened by merely tightening the nut as described above. It is difficult to tighten sufficiently, so that a gap is easily generated between the engine support portion and the bracket. However, such a gap tends to generate vibrations during traveling,
This was causing the ride to deteriorate. Excessive tightening to reduce this gap also results in increased tightening stress on the body frame.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motorcycle in which an engine is securely fastened to a bracket on a vehicle body frame without a gap and without increasing tightening stress of the vehicle body frame. Another object of the present invention is to provide an engine support structure.

[0005]

In order to achieve the above object, the present invention is to fix a bracket having a bolt hole to each of left and right body frames, and to interpose an engine support between the brackets. In a motorcycle engine support structure in which a support bolt is inserted so as to penetrate the entirety of the engine support portion and both brackets, and a nut is screwed into an end of the support bolt and fastened and fixed ,
The bolt hole, while inserting the male screw with collar forming an external thread on an outer peripheral surface slidably in the axial direction, respectively external thread portion of the collar with the male screw projecting on either side of one of Burake <br/> Tsu preparative said the lock nut configured to be screwed, wherein
With the lock nut loosened,
Hold the engine support between the inner end of the other bracket.
Threaded collar, engine support,
Pass the support bolt through each bolt hole of the other bracket,
Screw the nut onto the end of the support bolt and tighten the whole
Fix it to the other bracket, and then lock the lock nut
And tighten the collar with male screw
It is characterized by being fixed to one of the brackets .

Since the present invention is constructed as described above, when the nut at the end of the support bolt is tightened, the other bracket and the male threaded collar are brought into close contact with both side surfaces of the engine support portion without any gap. And at this time
The male threaded collar slides within one of the brackets to prevent significant tightening stress on the body frame.
By tightening the lock nuts on both sides of the male threaded collar on both sides of the bracket in this state, the engine can be securely tightened and fixed to the vehicle body frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a motorcycle shown in FIG. 2, a vehicle body frame 1 comprises a pair of left and right main frames 1a, down tubes 1b, and the like. This body frame 1
The front wheel 3 and the rear wheel 4 are attached to the front and rear. The engine 2 is supported on the body frame 1 at three support points indicated by A by a support structure as shown in FIG.

[0008] As shown in FIG.
Are respectively welded to the brackets 5, and the boss-shaped auxiliary brackets 5a are welded to the brackets 5 to form integral brackets. The left and right boss-shaped auxiliary brackets 5a have a male threaded collar 6 inserted into one of them (the right side in FIG. 1) so as to be slidable in the axial direction. That is, there is no female thread on the inner peripheral wall of the auxiliary bracket 5a, and the male threaded collar 6 is slidable in the axial direction on the inner peripheral wall without the female thread.

The collar 6 with male screw has both ends protruding from both sides of the auxiliary bracket 5a, and lock nuts 9 are screwed into male screws at both ends of the auxiliary bracket 5a. When the lock nuts 9 on both sides are loosened so as to be separated from both sides of the auxiliary bracket 5a, the auxiliary bracket 5a (bracket 5) and the male threaded collar 6 can move relative to each other in the axial direction. When the bracket 5a is tightened so as to be in close contact with both sides, the relative position between the auxiliary bracket 5a (bracket 5) and the male threaded collar 6 is locked.

The engine 2 is provided with a male screwed collar 6 and the other auxiliary bracket 5 (left side in FIG. 1).
a, and the support bolt 7 is inserted from the right to the left through the entire male-threaded collar 6, the engine support 2a, and the auxiliary bracket 5a in such a state that the engine support 2a is interposed therebetween. A nut 8 is screwed onto the bolt end. Of course, the direction in which the support bolt 7 is inserted may be opposite to the above, and may be inserted from the left to the right.

In such an engine support structure, the engine 2 is tightened and fixed as follows.
First, the lock nut 9 is loosened to allow the bracket 5 (auxiliary bracket 5a) and the male threaded collar 6 to be relatively movable in the axial direction, and then the entirety of the male threaded collar 6, the engine support 2a, and the auxiliary bracket 5a The support bolt 7 is inserted so as to penetrate, and the nut 8 is screwed to the bolt end to perform fastening and fixing. Due to this fastening, the space between the auxiliary bracket 5a on the left side of FIG. 1 and the engine support 2a and the space between the engine support 2a and the male threaded collar 6 are brought into close contact with each other without any gap.

At this time, the male threaded collar 6 is used to
Since it moves in the axial direction while sliding inside the bracket 5a, it stops at a position where no tightening stress is applied. Therefore, the collar 6 with the male screw stationary at an arbitrary position as described above.
The may be from both sides so as to secure in its rest position to clamp the lock nut 9. In this way,
It is possible to make sure that no tightening stress is applied to the vehicle body frame, and to securely tighten and fix the engine so that no gap is formed with respect to the vehicle body frame.

[0013]

As described above, according to the present invention, one of
A male screw is formed on the outer peripheral surface of the bolt hole of the bracket.
Insert the threaded collar slidably in the axial direction and
Male brackets with male threads protruding on both sides of one bracket
The lock nut is screwed into each thread
With the lock nut loosened and the inner end of the male threaded collar
Between the side and the inner end of the other bracket
With an external thread to support the engine
And support bolts through the bolt holes in the other bracket
Then, screw a nut onto the end of the support bolt and tighten
Fix the body to the other bracket, and lock nut
To the both ends of one bracket, and a male threaded collar
It is so arranged fixed to one bracket, is Sina as large tightening stress on the body frame does not occur
Therefore , the engine can be securely tightened and fixed to the body frame. Moreover, the nut on the end of the support bolt
If the body tightens too much,
There is no increase in power. Also, the engine support structure
Work well with commonly used spanners when assembling.
And no special tools are required. Furthermore, male screw
The attached collar is a cylindrical collar that only has a male thread on the outer peripheral surface.
Use two lock nuts, but use the standard lock nut.
Parts for the engine support structure.
It can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an engine support structure according to the present invention.

FIG. 2 is a side view showing an example of a motorcycle in which an engine is supported by the engine support structure of the present invention.

[Explanation of symbols]

1 body frame 2 engine 2
a Engine support part 5 Bracket 5a Auxiliary bracket 6
Male threaded collar 7 Support bolt 8 Nut 9
Lock nut

Claims (1)

(57) [Claims] 1. A bolt hole in each of left and right body frames.
Secure the bracket with the engine support portion is interposed between the both brackets by inserting the support bolt so as to penetrate the whole of the two brackets and the engine supporting portion,
In a motorcycle engine support structure in which a nut is screwed into an end portion of the support bolt and tightened and fixed, a male screw is formed on an outer peripheral surface of a bolt hole of one bracket.
With the inserted color with external thread axially slidably, respectively external thread portion of the collar with the male screw projecting on either side of one of the brackets the configured such screwing the lock nut, the slack of the lock nut The inner end of the male threaded collar
Between the side and the inner end of the other bracket
With an external thread to support the engine
And support bolts through the bolt holes in the other bracket
Then, screw a nut onto the end of the support bolt and tighten
Fix the body to the other bracket, and lock nut
To the both ends of one bracket, and a male threaded collar
The engine support structure of a motorcycle in which is fixed to one bracket .