JPH0436887B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for driving a pair of wheels by an engine via a chain or other wrapped transmission member in a vehicle having a pair of left and right wheels on at least one of the front and rear sides. .

A conventional device of this type, as seen in Japanese Utility Model Application Publication No. 57-188589, is a system in which an axle having a pair of left and right wheels is installed horizontally at the tip of a swing arm extending from a vehicle body frame, and the axle is connected to a sprocket on the outer periphery of the axle. It is known that the vehicle is connected to the engine via a chain or other wrapped transmission member to drive the pair of wheels.

In this case, it is also conceivable to provide a differential gear mechanism on the axle. In this case, the structure is such that the differential case that houses the differential gear mechanism is supported at the tip of the swing arm, increasing the support rigidity of the differential case to the swing arm, and making it possible to compactly assemble the sprocket and braking means to the differential case. It is hoped that

It is an object of the present invention to provide a device that meets such demands, and includes an axle having a pair of left and right wheels installed horizontally at the tip of a swing arm extending from a vehicle body frame including an engine. In a type in which the axle is connected to the engine via a chain or other wrapped transmission member at a sprocket on the outer periphery of the axle to drive the pair of wheels, a differential gear mechanism is provided on the axle. , a cylindrical portion extending to one axial end of a differential case housing the differential gear mechanism is pivotally supported at the tip of the swing arm, and a cylindrical portion extending relatively longitudinally to the other axial end of the differential case; is inserted into and pivotally supported by a brake panel fixed to the tip of the swing arm, and the sprocket and a brake drum extending from the sprocket toward the brake panel are jointly fastened to the differential case.

An example of implementing the present invention will be explained with reference to the attached drawings.

In the drawing, 1 indicates the vehicle body frame, and the frame 1
is equipped with an engine 2 in the middle part, a fuel tank 3 above it, a seat 4 for the passenger behind it, and a pair of left and right wheels 5, 5 linked to the engine 2 in front of it, and a pair of left and right wheels 5, 5 behind it. The engine 2
The vehicle is provided with a pair of left and right wheels 6, 6 which are interlocked with each other, so that the vehicle as a whole is constructed as a four-wheel drive type.

First, the pair of wheels 6, 6 on the rear side will be explained, for example, as clearly shown in FIG. The axle 8 is supported by a transverse axle 8, and the axle 8 is connected to the engine 2 via a chain 10, which is a winding transmission member, at a sprocket 9 on its outer periphery, and thus the pair of wheels 6, 6 is driven by the engine 2 via the axle 8, the sprocket 9, and the chain 10. To explain further, in the illustrated example, a rotating member 13 having an outer peripheral mounting flange 12 is fixedly mounted on the axle 8, and the sprocket 9 and brake drum 11 are superimposed on the side surface of the flange 12, and the screw 28 is attached. I made it stick. 1 in drawings
Reference numeral 4 indicates a brake panel on the side thereof, and reference numeral 15 indicates a brake arm that is pivotally supported by the panel 14 and extends outward.

Next, the pair of front wheels 5, 5 will be explained with reference to FIG.

The wheels 5, 5 are swingably connected to both ends of an axle 17 installed horizontally at the tip of a swing arm 16 extending forward from the vehicle body frame 1, and are connected via a pair of left and right tie rods 27, 27. The wheels 5, 5 are steered by the steering wheel.

A differential gear mechanism 26 is provided on the axle 17, and the axle 17 is divided into left and right halves 17a, 17a connected via the differential gear mechanism 26. It is now possible to apply differential rotation during steering.

The differential gear mechanism 26 is connected to the engine 2 via a chain 19, which is a winding transmission member, at the outer peripheral sprocket 18 of the differential case 22 housing the differential gear mechanism 26. It was pivotally supported at the tip of the swing arm 16.

Here, the swing arm 16 of the differential case 22
To increase the support rigidity for the differential case 22
It is desirable to have a long support span between the cylindrical parts at both ends of the cylinder, so in this embodiment, one of the cylindrical parts, for example the left cylindrical part 22a in the drawing, is formed relatively long so that the support span can be made long. did.

The cylindrical portion 22a is inserted and supported by a brake panel 24 fixed to the tip of the swing arm 16, and is connected to the sprocket 18 and the brake panel from the sprocket 18 to a flange 21 formed on the outer periphery of the differential case 22. The brake drum 20 extending toward 24 was tightened together with bolts 23. According to this, the space around the cylindrical portion 22a created by increasing the length of the cylindrical portion 22a can be effectively utilized as a space for arranging the control means. In addition, 25 in the figure is a brake arm extending from the brake panel 24.

As is clear from the above description, according to the present invention, by lengthening the cylindrical portion on one side extending to the differential case, it is possible to increase the supporting rigidity of the differential case with respect to the swing arm, and also to reduce the space around the cylindrical portion. It has the effect of improving space efficiency by utilizing the space for arranging the means.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an example of a vehicle equipped with the device of the present invention, Fig. 2 is a plan view with a portion of the rear wheel side cut away;
FIG. 3 is a plan view with a portion of the front wheel side cut away. 1...Vehicle frame, 2...Engine, 5,5
...Front wheel, 16...Swing arm, 17
... Axle, 18 ... Sprocket, 19 ... Chain, 20 ... Brake drum, 22 ... Differential case, 22a ... Long tube part, 24 ... Brake panel, 26 ... Differential gear mechanism.

Claims (1)

[Claims] 1. An axle with a pair of left and right wheels is installed horizontally at the tip of a swing arm extending from a vehicle body frame that includes an engine, and the axle is connected to the engine via a chain or other wrapped transmission member at a sprocket on the outer periphery of the axle. A differential gear mechanism is provided on the axle, and a cylindrical portion extending to one end in the axial direction of a differential case housing the differential gear mechanism is provided on the axle to drive the pair of wheels. A cylindrical portion extending relatively longitudinally at the other end in the axial direction of the differential case is inserted into and pivotally supported by the brake panel fixed to the tip of the swing arm, and A wheel drive device for a vehicle, characterized in that the sprocket and a brake drum extending from the sprocket toward the brake panel are fastened together.