JPS5943188Y2 - motorcycle engine suspension system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a motorcycle engine suspension system.

Generally, a motorcycle engine is suspended by bolting the engine case to a bracket protruding from the vehicle body at several locations in the front and back.

Engines vibrate due to rotational vibrations of the crankshaft and fluctuations in driving torque, but the weight of the engine and these vibrations are all absorbed by the bracket.

Therefore, the bracket must be thick and strong, and when tightened, the bolts may loosen due to vibration, causing problems such as the bolt holes of the bracket and the bolt holes of the engine case becoming worn and enlarged.

This invention has been improved in view of these points, and the embodiments of the invention shown in the drawings will be described below.

The engine case 1 is aligned with the brackets 3 protruding from the vehicle body 2 at several places in the front and rear, and is fastened with bolts 4 inserted through the brackets 3 and the engine case 1.

Accordingly, in the present invention, protrusions 6 are provided on the central dividing surface 5 of the engine case 1 so as to protrude more than the other engine case 1 so that the protrusions 6 alternate in the front and rear.

On the other hand, protrusions 7 are protrudingly provided at the front and rear positions of the engine case 1 of the vehicle body 2.

When the engine case 1 is suspended on the bracket 3, the protrusion 6 of the engine case 1 is brought into contact with the protrusion 7 of the vehicle body 2.

The effect will be explained.

The weight and vibrations of the engine are received by the bracket 3 via the bolt 4.

However, since the protrusion 6 of the engine case 1 is in contact with the protrusion 7 of the vehicle body 2, the protrusion 7 partially bears the load of the lateral vibration.

Therefore, the burden on the bracket 3 is reduced, and lateral vibration is reduced, so that the loosening of the bolt 4 tightened in the lateral direction can be reduced.

As explained above, this idea is that when an engine case is bolted to a bracket that protrudes from the vehicle body at several places in the front and rear, the central dividing surface of the engine case is made to protrude more than the other engine case. Since the protrusions are provided alternately in the front and rear, and the protrusions on the engine case are still in contact with the protrusions protruding from the vehicle body, the protrusions can partially bear the lateral vibrations of the engine case. The burden on the bracket can be reduced.

Since vibrations in the left and right direction can be controlled by the protrusions, vibrations can be reduced, loosening of bolts can be reduced, and wear of bolt holes in the bracket and engine case can also be reduced.

In addition, the accuracy of the attachment between the engine case and the vehicle body has improved, the change-in connection between the engine and the rear wheel has become more accurate, and the durability of the chenno has also been improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a partially enlarged view taken in the direction of arrow A in FIG. 1, and FIG. 3 is a partially enlarged view taken in the direction indicated by arrow B in FIG. 1...engine case, 2...car body,
3...Bracket, 4...Bolt, 5
...Central dividing surface, 6...Protrusion, 7...Protrusion piece.

Claims (1)

[Scope of utility model registration request] In cases where the engine case is fastened with bolts to brackets protruding from the vehicle body at several locations in the front and rear, protrusions that protrude from the other engine case are provided alternately in the front and rear on the center dividing surface of the engine case. An engine suspension system for a motorcycle, characterized in that a protrusion of an engine case is brought into contact with a protrusion protruding from the engine case.