JPH04365688A - Engine support structure for motorcycle - Google Patents

Abstract

PURPOSE:To fasten up an engine through a single step of fastening a nut, by inserting a slitted collar in one of a brackets fixed to a vehicle body frame, by forming a tapered fitting hole in the bore part of the collar, and by forming a tapered surface at the inner end of the nut. CONSTITUTION:A bolt 7 is inserted through brackets 5 welded to right and left vehicle body frames 1 of a motor-cycle and clamping therebetween an engine support part 2a, and is fastened up by a nut 8. In this arrangement, an annular auxiliary bracket 5a is welded to one of the brackets 5, and a collar 6 having splitting slits is inserted to the other one of the brackets 5 so as to clamp the engine support part 2a. A tapered fitting hole 9 is formed in the bore part of the collar, and a tapered shank part 12 is integrally incorporated with the inner end part of the nut 8. When the nut 8 is tightened, the collar 6 is pressed axially through the abutting between the tapered shank part 12 and the tapered fitting hole 9 so as to abut against the engine support part 2a, and thereafter, it is diametrically enlarged so as to closely fitted in the inner periphery of the bracket 5.

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, which allows an engine to be tightened and fixed to a vehicle body frame with a simple operation.

0002

[Prior Art] In general, a method for supporting an engine on a body frame of a motorcycle is to interpose an engine support part between brackets on the body frame arranged on the left and right sides, insert a bolt so as to penetrate the entire bracket, and then A nut is screwed onto the end of the bolt and tightened. However, in recent motorcycles, the body frames of motorcycles have been made to have higher rigidity in line with their improved performance, and this rigidity interferes with the ability to tighten the engine sufficiently by simply tightening the nuts as described above. Things are becoming more difficult.

As a countermeasure for solving this situation, Japanese Utility Model Application Publication No. 1-170093 proposes the use of a threaded collar as shown in FIG. That is, a threaded collar 46 is screwed into one of the brackets 45 fixed to the left and right vehicle body frames 41, respectively. In this support structure, both brackets 4
5, to tighten the support part 2a of the engine 2, first screw the threaded collar 46 toward the engine support part 2a so that it comes into contact with the side surface, and then tighten the nut 48 at the end of the bolt 47. This ensures that the body frame 41 is tightened regardless of its high rigidity.

However, this proposed engine support structure requires a two-step operation of threading the threaded collar and tightening and fixing the nut.
It is inevitable that the work will become more complicated.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motorcycle engine which eliminates the drawbacks of the prior art described above and allows the engine to be reliably tightened to the body frame with just one operation of tightening a nut. The purpose is to provide a supporting structure.

[0006]

[Means for Solving the Problems] The present invention achieves the above object by fixing brackets to left and right vehicle body frames, interposing an engine support part between the two brackets,
In an engine support structure for a motorcycle, in which a bolt is inserted so as to pass through the entirety of the engine support part and both of the brackets, and a nut is screwed to the end of the bolt and tightened and fixed, one of the brackets is split. A collar having a slit is slidably inserted coaxially to the outside of the bolt, and a tapered fitting hole is formed on the inner diameter side of the collar,
On the other hand, the nut is characterized in that a tapered shaft portion that can be inserted into the tapered fitting hole of the collar is integrally formed at the inner end of the nut.

[0007] Since the present invention has the above-mentioned configuration, when the nut is screwed toward the engine support part, the collar is moved until it comes into contact with the engine support part, and at the same time, the collar is moved through the split slit. It can be expanded radially and tightly fixed to a bracket on the vehicle body frame. Therefore, just by tightening the nut, 1
The engine can be securely tightened against the vehicle frame with just a touch.

[0008]

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

As shown in FIGS. 1 and 2, brackets 5 are welded to the left and right vehicle body frames 1, respectively. A tubular auxiliary bracket 5a is welded to one of these brackets 5 (left side in FIG. 1), and the other (right side in FIG. 1)
A collar 6 is slidably inserted in the axial direction, and the support portion 2a of the engine 2 is sandwiched between the auxiliary bracket 5a and the collar 6. A bolt 7 passes through the auxiliary bracket 5a, the engine support part 2a, and the collar 6 arranged in this way in the left-right direction, and a nut 8 is screwed into the shaft end on the collar 6 side.

The collar 6 has a tapered fitting hole 9 on the inner diameter side and a split slit 10 along the axial direction. Further, the collar 6 has a groove 11 along the axial direction on the inner surface opposite to the split slit 10, and is made thin at the groove 11 portion. On the other hand, the nut 8 has a tapered shaft portion 12 integrally formed on the inner end side facing the engine support portion 2a side.
2 is inserted into the tapered fitting hole 9 of the collar 6.

In such a support structure, in order to tighten and fix the engine support part 2a, it is only necessary to screw the nut 8 screwed onto the end of the bolt 7 toward the engine support part 2a. When the nut 8 is screwed on in this way, the collar 6 is pushed in the axial direction through contact with the tapered shaft portion 12 and the tapered fitting hole 9, and first, the inner end thereof is attached to the engine support portion 2a.
contact the side of the Further, when the nut 8 is screwed, the tapered shaft portion 12 pushes up the tapered fitting hole 9 in the radial direction through the tapered surface, so that the split slit 10
The collar 6 expands in the radial direction and is tightly fixed to the inner circumferential surface of the bracket 5. Such a close fixation effect can be further promoted by providing grooves 11 on the inner surface of the collar 6 as in this embodiment. In this manner, the engine can be reliably tightened to the vehicle body frame simply by screwing the nut 8.

0012

As described above, according to the present invention, a collar having a split slit is slidably inserted into one of the brackets fixed to the left and right vehicle body frames, and a tapered fitting hole is provided on the inner diameter side of the collar. The inner end of the nut, which is screwed onto the other through-bolt, is integrally formed with a tapered shaft portion that can be inserted into the taper fitting hole of the collar, so that the nut can be attached to the engine support portion with respect to the bolt. By simply screwing the collar toward the side, the collar moves until it touches the engine support side, and at the same time, the collar expands radially through the split slit and tightly attaches to the inner peripheral surface of the bracket on the vehicle body frame. It can be tightly fixed, and the engine can be reliably tightened to the vehicle frame with just one screw operation of the nut.

[0013]

[Brief explanation of 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 sectional view taken along arrow II-II in FIG. 1;

FIG. 3 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.

FIG. 4 is a longitudinal sectional view showing an example of a conventional engine support structure.

[Explanation of symbols]

1 Body frame 2 Engine 2a Engine support part 5 Bracket 6
Collar 7 Bolt 8 Nut 9
Tapered fitting hole 10 split slit

Claims (1)

[Claims] [Claim 1] Brackets are fixed to left and right vehicle body frames, an engine support part is interposed between the two brackets, and a bolt is inserted so as to pass through the entire engine support part and the two brackets. In a motorcycle engine support structure in which a nut is screwed onto the end of a bolt and tightened and fixed, a collar having a split slit is slidably inserted coaxially to the outside of the bolt in one of the brackets, and An engine support structure for a motorcycle, wherein a tapered fitting hole is formed on the inner diameter side of the collar, and a tapered shaft portion that can be inserted into the tapered fitting hole of the collar is integrally formed at the inner end of the nut.