JPH03213426A - Engine mounting device for small-size vehicle - Google Patents

Abstract

PURPOSE:To attenuate vibration and prevent metallic noise in an engine by floatingly support the engine with mount rubbers in normal driving, and pressing a vertical stopper against a stopper rubber to regulate the engine when vertical vibration is excessive, or the like. CONSTITUTION:On a small-sized vehicle such as a golf car, rear side two wheels are driven by an engine 1 mounted on the lower part of a frame 2, whereas mount rubbers 8 installed in both the sides of a lower bracket 7 support an upper bracket 9 in a floating state. A vertical stopper 10 is disposed on the lower end of the upper bracket 9. The lower bracket 7 is provided with multiple mount brackets 6 where a stopper rubber 11 is installed facing the vertical vibration stopper 10. The engine 1 is mounted on the frame 2 through the mount bracket 6. On the other hand, a stopper rod 15 which regulates a forward and backward motion range is disposed between the front upper bracket 9 and a frame stopper 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine mounting device for a small vehicle such as a golf car.

[Conventional technology]

Small vehicles such as golf cars use an engine mounted at the rear of the frame to drive the two rear wheels. Then, a centrifugal clutch for starting and a continuously variable belt transmission are connected to the engine to enable automatic starting and automatic shifting, making it easy to drive by controlling engine rotation with a single accelerator pedal. There is. The engine is mounted on the frame via mounting rubber at four points.
It dampens the transmission of engine vibrations to the frame. For example, see Japanese Unexamined Patent Publication No. 6:L-220922.

[Problem to be solved by the invention]

In order to reduce the vibrations transmitted to the frame, it is necessary to mount the engine using a mount rubber that has a low spring constant and is soft and can absorb vibrations well. but,
If a soft mount rubber is used, when the centrifugal clutch engages after a sudden start, the reaction of the rear wheel drive torque will be applied to the engine, causing the engine to move significantly and causing the distance between the axles of the continuously variable belt transmission to change. . In order to prevent this, if a stopper is provided to restrict the range of movement of the engine, there is a problem in that the stopper hits and generates a metallic sound.

For this reason, we use hard mount rubber with a high spring constant,
This impairs vibration damping.

In view of these points, the present invention uses a soft mount rubber with a low spring constant and good vibration damping properties for the mount bracket on which the engine is mounted, and uses a hard stopper rubber separately to prevent the generation of metallic sounds for small vehicles. The objective is to obtain an engine-mounted device for this purpose.

[Failure to solve the problem]

In order to achieve the above object, the engine mounting device for a small vehicle of the present invention drives the rear two wheels with the engine mounted at the rear of the frame, and the upper bracket is floated by mounting rubber attached to both sides of the lower bracket. A horizontally bent upper and lower stopper is provided at the lower end of the upper bracket, and a plurality of mount brackets with stopper rubber attached are provided on the lower bracket to face the upper and lower stoppers, and the engine is mounted on the frame via the mount brackets. The reason is that a stopper rod is provided between the front upper bracket and the frame stopper to restrict the range of movement in the front and back direction.

[Effect]

During normal engine operation, the engine is held floating by a rubber mount with a low spring constant, and the rubber mount has good vibration absorption ability, reducing vibrations transmitted to the frame. When the engine moves up and down significantly due to a sudden latch connection, etc., the upper and lower stoppers hit the stopper rubber, and the stopper rubber interferes to restrict engine movement and prevent metallic noise from occurring.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The engine 1 is mounted at the rear of the frame 2, and drives the two rear wheels 5 via a continuously variable belt transmission 3 and a transmission 4 equipped with a centrifugal clutch for starting. The mount bracket 6 is constructed by attaching soft mount rubbers 8 with a low spring constant to both sides of the upper bracket 9, which are attached by baking or the like to both sides of the lower bracket 7, which has a concave shape.The upper bracket 9 is made to float with the mount rubbers 8. It is designed to hold. At the lower end of the upper bracket 9, a vertical stopper 10 is bent laterally to increase the contact area.
A hard stopper rubber 11 having a higher spring constant than the mount rubber 8 is stretched below the upper and lower stoppers 10 of the lower bracket 7. A mount fitting 12 is fastened to the lower surface of the engine 1, and the mount fitting 12 is fastened to the upper bracket 9 of the mount bracket 6 at two places on the front side and at two places on the rear side. Then, the lower bracket 7 of the mount bracket 6 is fastened to the frame bracket 13 welded to the frame 2. A frame stopper 14 is provided on the frame 2 on the front side of the front mount bracket 6. Insert the stopper rod 5, pass the tip of the stopper rod 15 through the upper bracket 9, and tighten the lock nut 16 to limit the front and rear movable range. It is adjustable.

〔Effect of the invention〕

As explained above, since this invention is configured as described above, there is little large movement of the engine during normal engine operation, and the mount rubber of the mount bracket with a low spring constant can sufficiently dampen engine vibrations. This reduces the amount of vibration transmitted to the frame, resulting in a more comfortable ride.

When the engine moves up and down significantly due to a reaction force such as when the starting clutch suddenly engages, the vertical stopper of the mount bracket hits the stopper rubber to limit the up and down movement, and the stopper rubber also buffers the engine to reduce metallic noise. I'll try to prevent it from happening.

Furthermore, when the engine moves back and forth due to reaction force, it is restricted by a stopper rod to prevent fluctuations in the distance between the axes of the continuously variable belt transmission.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of an engine part, Fig. 2 is a mount bracket, Fig. 3 is a front view thereof, and Fig. 4 is a side view of the entire engine. 1...Engine, 2...Frame, 5...Rear two wheels,
6...Mount bracket, 7...Lower bracket, 8...Mount rubber, 9...Upper bracket, 10..." Countertop stopper 11...Stopper rubber, 14...Frame stopper 15 ...Stopper rubber.

Claims (1)

[Claims] The engine mounted at the rear of the frame drives the rear two wheels.The upper bracket is held floating by mounting rubber attached to both sides of the lower bracket, and a horizontally bent vertical stopper is provided at the lower end of the upper bracket. A plurality of mount brackets with stopper rubber attached are provided facing the upper and lower stoppers, the engine is mounted on the frame via the mount brackets, and the range of movement in the front and back direction is restricted between the front upper bracket and the frame stopper. An engine mounting device for a small vehicle characterized by being equipped with a stopper rod.