JPS61295129A - Engine mounting structure for small vehicles - Google Patents

Abstract

PURPOSE:To make a vibration being hard to be transmitted to a body frame and improve a feeling of driving comfortableness ever so better, by making elasticity in the front side of an elastic member supporting an engine body softer than that in the rear side, while letting the engine body rock with the rear side as a supporting point. CONSTITUTION:A rear end of an engine body 22 is pivontaly supported on a transmission 11 lyinh between both rear-wheel axle tubes 9 and 9 via a cylindrical bush-form elastic member 28, while the front end is supported on the support frame 25 stretched across between these rear-wheel axle tubes 9 and a body frame 2 via a rubber mount 32. And, this rubber mount 32 is set to be softer than the cylindrical bush 28 whereby the engine body 22 is rocked with a fulcrum shaft 27 as a supporting point, thus vibro-energy is absorbable. In consequence, vibration of the engine body 22 are hard to be transmitted to the body frame 22, making a body sensitive vibration smaller, and a feeling of driving comfortableness is improvable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine support structure for small vehicles such as golf cars and community vehicles.

[Conventional technology]

BACKGROUND OF THE INVENTION With the recent rise in oil prices, small vehicles have attracted widespread attention from the standpoint of resource and energy conservation.

This type of small vehicle generally drives the rear wheels suspended by a rear arm.Unlike regular cars, in order to simplify the structure as much as possible, conventionally the engine and transmission were mounted on the rear arm. Either it was fixed, or the engine itself, in which the engine body, power transmission mechanism, transmission, etc. were integrated into a single unit case, was used as a rear arm.

[Problem that the invention seeks to solve]

However, with this structure, vibrations from the engine body are easily transmitted to the vehicle body frame, resulting in poor ride comfort.

[Means for solving problems]

The present invention was made in view of these circumstances, and provides an engine support structure for a small vehicle that can improve riding comfort. In the engine support structure for a small vehicle according to the present invention, the rear end of the engine body is pivoted to the transmission between both rear wheel axle tubes via an elastic member, and the front end is supported between the rear wheel axle tube and the vehicle body frame. The engine body is supported via an elastic member on a support frame that spans the engine body, and the elastic member on the front side of the engine body is made softer than the elastic member on the rear side.

[Effect]

In the present invention, vibrations of the engine body are made difficult to be transmitted to the vehicle body frame by rocking the engine body using the rear side as a fulcrum to absorb vibrations.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing the main parts of a small vehicle in which the engine support structure according to the present invention is implemented, FIG. 2 is a right side view, FIG. 3 is a left side view, and FIG. 4 is a view of the entire small vehicle. In these figures, the reference numeral 1 indicates a small vehicle. This small vehicle 1 includes a body frame 2 made of pipe material, a body 4 that covers the body frame 2 and forms a driver's cabin having a seat 3 between it, and is supported at the front and rear of the body frame 2. The vehicle includes front wheels 5 and rear wheels 6, an engine 7 disposed at the rear of the small vehicle 1, and driving the rear wheels 6. body frame 2
has a side tube 2a that extends upward behind the seat 3 and above the left and right rear wheels 6, and two cross tubes 2b, 2b that connect the side tube 2a at the rear end and the rear of the seat 3. There is.

Reference numeral 9 denotes a pair of left and right rear wheel axle tubes into which a rear wheel axle 10 with a rear wheel 6 attached to the end is inserted, and a reversing mechanism for moving the small vehicle 1 backward is provided between these rear wheel axle tubes 9.9. A transmission 11 is interposed. Reference numeral 12 denotes a rear arm 1 which is rotatably connected between the rear wheel axle tube 9 and the cross tube 2b behind the seat 3 by having both ends thereof pivoted.
A suspension 3 is connected between the rear wheel axle tube 9 and the cross tube 2b at the rear end of the side tube 2a, and suspends the rear wheel 6 together with the rear arm 12. 14 is a lateral rod that restricts the rear wheel axle tube 9 from moving left and right; its left end is pivotally connected to a stay 15 hanging down from the cross tube 2b on the rear end side; It is pivotally connected to a placket 16 fixed to the right end. That is, the rear wheel axle tube 9 is connected to the rear arm 12. suspension 13
．． The rear arm 12 is supported by a lateral rod 14 so as to be swingable in the vertical direction using the front end of the rear arm 12 as a fulcrum.

The engine 7 has an air cleaner 20. carburetor 2
1. It is composed of an engine body 22, etc., and a power transmission device 23 is provided on the left side of the engine body 22 to transmit the power of the engine body 22 to the transmission 11, and on the opposite right side, a power transmission device 23 is provided to improve the left and right weight balance. A muffler 24 is provided for this purpose. Therefore, the center of gravity of the engine 70 is set approximately at the center of the engine, as shown by G in FIG. The rear end of the engine body 22 is pivotally supported by the transmission 11 via an elastic member, and the front end is supported by the support frame 25 via an elastic member. To explain the pivoting of the rear end, a rear bracket 26 having a U-shape in plan view is attached to the rear end of the engine body 22 at a position corresponding to approximately the center of the power transmission device 23. A horizontally suspended pivot shaft 27 is inserted into a cylindrical bushing 28 supported by the transmission 11. That is, the cylindrical bushing 28 is made up of an outer cylinder 28a, an inner cylinder 28b, and a cylindrical rubber bushing 28c baked into these cylinders, as shown in FIG. It is inserted into a pivot hole 29 that passes through the engine support portion 11b provided in the engine 11 in the vehicle width direction.

To explain the support of the front end, Fig. 6 shows ■- in Fig. 1.
As shown in the cross-sectional view taken along the line 2, a front bracket 30 extending in the vehicle width direction, which is attached to the front end of the engine body 22, is provided with flanges 30a having an angular cross-section when viewed from the front.

These flanges 30a.

30a is set to have a wider span than the engine main body 22. Thereby, vibrations of the engine body 22 in the vehicle width direction are reduced.

A support bracket 31 has a U-shaped cross section and is fixed to the support frame 25 facing the flange 30a. A rubber mount 32 is bonded between the support bracket 31 and the flange 30a so as to span between these members. There is. The front end of the support frame 25 is connected to the approximate center of the cross tube 2b behind the seat 3 via a rubber mount 33, and the rear end branched to the left and right is fixed to the left and right rear wheel axle tubes 9.9. By connecting the body frame 2 and the rear axle tube 9
It is spanned between.

Here, since the rubber mount 32 is glued so as to sandwich the flange 30a of the front bracket 30 in the vehicle width direction,
It can be easily deformed in the vertical direction, which is the shearing direction. Therefore, the rubber mount 32 on the front side of the engine body 22 is set to be softer than the rubber bushing 28a of the cylindrical bushing 28 on the rear side, which is compressively deformed.

The power transmission device 23 is a V-belt that transmits the power of the engine body 22 in a stepless manner, and includes a pulley 23a mounted on the crankshaft 22a of the engine body 22,
A V-bell 23C is attached between the input shaft 11a of the transmission 11 and a pulley 23b mounted on the input shaft 11a. Reference numeral 23d denotes a cover that seals the entire outside of the V-belt 23c and pulleys 23a and 23b to protect the device from dust, and is divided into front and rear parts and deformably connected by bellows 236.

The air cleaner 20 is arranged above the transmission 11,
It is pivotally connected to the transmission 11 via a link 35 by a pivot 20b that is horizontally suspended from a bracket 20a that projects from the lower rear side. The carburetor 21 is interposed between the air cleaner 20 and the engine body 22. The muffler 24 has a bracket 36 welded near its center of gravity, and is swingably supported by a cylindrical bushing 37 provided so that an extension of its axis is close to the axis of the cylindrical bushing 28. Therefore, the muffler 24 does not hinder the rocking of the engine body 22.

In the engine support structure for a small vehicle configured in this way, the rubber mount 32 that elastically supports both the front and rear ends of the engine body 22 and supports the front end is set to be softer than the cylindrical bushing 28 that supports the rear end. Because
The engine body 22 can be swung up and down about a pivot 27 inserted through a cylindrical bush 28 as a fulcrum. This is because the front rubber mount 32 is more easily elastically deformed than the cylindrical bushing 28.

At this time, the pivot 27 is attached to a position corresponding to the approximate center of the power transmission device 23, and even if the engine body 22 swings, the crankshaft 22a of the engine body 22 and the transmission 11
Since the distance between the input shaft 11a and the input shaft 11a does not become large, excessive tension is not applied to the bell) 23c of the power transmission device 23.

Therefore, vibration energy can be absorbed by vertically swinging the engine body 22 about the pivot 27 as a fulcrum. As a result, the vibrations of the engine body 22 are less likely to be transmitted to the vehicle body frame 2, and the perceived vibrations can be reduced.

Furthermore, in the embodiment, since the carburetor 21 is interposed between the air cleaner 20 and the engine body 22,
The engine 7 does not become larger. Furthermore, since the carburetor 21 can be disposed near the swinging fulcrum of the engine body 22, fluctuations in the oil level of the carburetor 21 are reduced.

In the above embodiment, an example will be described in which the front end of the engine body 22 is supported by the support frame 25 via an elastic member, and the flange 30a of the front bracket 30 is sandwiched between the rubber mounts 32 in the vehicle width direction. However, the present invention is not limited to this, and for example, the seventh
As shown in the figure, the front bracket 40 is made to protrude forward,
The rubber mount 42 may be provided between the front bracket 40 and a support bracket 41 that faces the front bracket 40 at a distance.

In this embodiment, since the rubber mount 42 is elastically deformed in the torsional direction, it can be made flexible against vertical deformation in a small space.

〔Effect of the invention〕

As explained above, according to the present invention, the rear end of the engine body is pivotally supported to the transmission between both rear wheel axle tubes via an elastic member, and the front end is supported between the rear wheel axle tube and the vehicle body frame. Since the engine body is supported via an elastic member on a support frame that extends over the engine body, and the elastic member on the front side of the engine body is made softer than the elastic member on the rear side, the engine body can be swung with the rear side as a fulcrum.

Therefore, vibrations from the engine body can be absorbed and transmitted to the vehicle body frame less easily, resulting in improved riding comfort.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the main parts of a small vehicle in which the engine support structure according to the present invention is implemented, FIG. 2 is a right side view,
Fig. 3 is a left side view, Fig. 4 is a perspective view showing the entire small vehicle, Fig. 5 is a sectional view taken along line V-V in Fig. 1, and Fig. 6 is a sectional view taken along lines Vl- and Vl in Fig. 1. , FIG. 7 is a plan view of main parts showing another embodiment. 2...Vehicle frame, 9...Rear axle tube, 11
...Transmission, 22...Engine body, 25...
...Support frame, 27...Pivot, 28...Cylindrical bush, 32...Rubber mount.

Claims (1)

[Claims] In a small vehicle in which an engine that drives the rear wheels is installed at the rear, the rear end of the engine body is pivotally supported via an elastic member to a transmission installed between both rear wheel axle tubes, and the front end is connected to the rear wheel. An engine support for a small vehicle in which the engine body is supported via an elastic member on a support frame stretched between a wheel axle tube and a vehicle body frame, and the elastic member on the front side of the engine body is set to be softer than the elastic member on the rear side. structure.