JPH0459168B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a four-wheeled motor vehicle for rough terrain, and particularly to an arrangement structure of an engine and a reduction gear.

A four-wheeled motor vehicle for traveling on rough terrain is known in which two front and rear wheels are suspended on a frame that extends from the front to the rear of the vehicle body, and the engine is mounted behind the seat located between the front and rear wheels. A reduction gear was placed on the side of the engine mounted on the vehicle. For this reason, the width between the engine and the speed reduction device disposed on the side thereof is relatively large with respect to the left-right center line of the vehicle body.

By the way, in such four-wheeled vehicles, the vehicle body often swings around the left and right center line as it travels on rough terrain, and the vehicle body also often swings around the axles of the left and right rear wheels. In other words, there is little rocking of the left and right center line portions of the vehicle body, and there is also little rocking of the rear axle portion at the rear of the vehicle body.

The present invention has been made focusing on the above points,
The purpose of this is to rationally locate the engine and reduction gear in the left and right center of the vehicle body and in the rear axle, and to protect the engine and reduction gear by centrally placing them in areas where there is less shaking. It is an object of the present invention to provide a four-wheeled motor vehicle for use on rough terrain, in which the width of the loaded items is reduced.

In order to achieve such an object, the present invention provides a four-wheeled motor vehicle for rough terrain, in which an engine and a deceleration device, which are each configured separately, are mounted in the center left and right of the vehicle body behind the seat, and the engine and deceleration device are mounted in the center of the vehicle body. and the engine is arranged in front of the left and right rear wheel axles extending from the reduction gear to both sides of the vehicle body, the reduction gear is arranged behind the axles, and the reduction gear is arranged tilted upward from the rear. The rear wheel axle is disposed below a power transmission member provided between the engine and the reduction gear.

Furthermore, the present invention is characterized in that the outer periphery of the engine and the reduction gear is surrounded by a frame, and the exhaust muffler of the engine is disposed horizontally in the frame above the reduction gear so as to be substantially orthogonal to the longitudinal direction of the vehicle body.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a perspective view of a four-wheeled vehicle for rough terrain;
The figure is a plan view of the rear part of the vehicle body, FIG. 3 is a partially cutaway plan view showing an enlarged mount structure for the engine and reduction gear, and FIG. 4 is a side view of the same.

Two front wheels 3, 3 are suspended on the front part of a body frame 2 of a four-wheeled motor vehicle 1, and two rear wheels 4, 4 are suspended on the rear part,
The main frames 20 on both the left and right sides are composed of pipes 21 and 22 in the form of upper and lower bars extending in the front and back, and a seat 5 is arranged between the front and rear wheels, and in front of this is supported by a column 6. A steering handle 7 is facing, and a roll bar 30 is provided on the frame 2.

An internal combustion engine 8 and a speed reduction gear 9 are mounted behind the seat 5 in order from the front.

The frame structure at the rear of the vehicle body is as shown in FIGS. 3 and 4. A lower pipe 22 is bent and connected to the rear part of upper pipes 21 forming the left and right main frames 20, and the rear ends of both upper pipes 21 and 21 are connected to a rear pipe 23. The two lower pipes 22, 22 are connected by a cross pipe 24 installed at a bent portion at the rear of the seat 5. Further, two left and right mount pipes 25, 25 are installed between the cross pipe 24 and the rear pipe 23, and the mount pipe 25 is bent downward.
The intermediate portions of both pipes 25, 25 are bent parallel to the left-right center line C of the vehicle body, and the pipes 26, 2
7 and 28 are connected.

Left and right brackets 41, 41 are protruded near the center of the cross pipe 24, and the front part of the crankcase 81 of the engine 8 is attached to both brackets 41, 41.
41 with bolts, and both the mount pipes 2
Common bracket 4 protruding from the front of 5 and 25
The rear part of the crankcase 81 is bolted to the front part of the engine 2, 42, and the engine 8 with a horizontal crankshaft is mounted.

Further, left and right brackets 43, 43 are protruded near the center of the rear pipe 23, the rear part of the gear case 91 of the reduction gear 9 is bolted to both brackets 43, 43, and the rear two brackets 43, 43 are installed between the mount pipes 25, 25. The gear case 9 is attached to the brackets 44, 44, 45, 45 protruding from the main pipes 26, 27.
The middle part of the case 91 is bolted together at two places, front and back, and the front part of the case 91 is connected to the shared brackets 42, 42.
is bolted to the rear of the vehicle, and the speed reducer 9 is mounted in a backward-inclined manner.

Also, the rear upper part of the crank case 81 and the gear case 91
The front upper part of the left and right connecting plates 46,
Bolt connection is made at 46.

In the above, the crank case 8 of the engine 8
A drive pulley 82 provided at the end of the crankshaft faces the left side from 1, and a gear case 91 of the reduction gear 9
A driven pulley 92 provided at the end of the input shaft faces the left side from the rear of the input shaft, and the driven pulley 92 is arranged higher than the drive pulley 82.
Both pulleys 82 and 92 have a power transmission member V
A belt 93 is hung, and the engine 8 and the speed reducer 9 are interlocked and connected on their sides by the belt converter.

On the other hand, both ends of an output shaft 94 protrude from the front part of the gear case 91 of the reduction gear 9 on both sides.
5 and 95 are connected via yoke joints 96 and 96. Therefore, the output shaft 94 is the rear wheel axle shaft.
The engine 8 is disposed in front of the vehicle, and the reduction gear 9 is disposed in the rear thereof.

Since the engine 8 and the speed reducer 9 are thus mounted on the left-right center line C of the vehicle body and are arranged front and rear, the width of these mounted items becomes small. Furthermore, since the engine 8 and the reduction gear 9 are distributed and centrally arranged before and after the rear wheel axle shaft 94, the engine 8 is located at the intersection of the rear wheel axle shaft 94 and the left-right center line C of the vehicle body, which has little left-right and vertical rocking. and the speed reducer 9 can be rationally arranged centrally, and both objects can be protected. In addition, since the speed reducer 9 is arranged on the center line C and the axles 95, 95 are symmetrically connected to the output shaft 94, the cushion stroke of the left and right rear wheels 4, 4 can be made equal with a simple structure. can.

By the way, as shown in FIG. 2, a carburetor 84 is connected to the rear of the cylinder 83 of the engine 8, and an exhaust pipe 85 is connected to the front of the cylinder 83. This exhaust pipe 85 is bent to the left, and a main muffler 86 connected to the exhaust pipe 85 is arranged to the left of the engine 8 inside the main frame 20. A sub-muffler 88 is connected to the main muffler 86 via a connecting pipe 87, and the connecting pipe 87 is bent to the right. The sub-muffler 88 is housed within the width of the frame and is disposed below the two left and right rear roll bars 31, 31 connected to the rear pipe 23.

By arranging the sub-muffler 88 within the width and rear end of the frame in a plan view, and positioning it below the left and right rear roll bars 31, 31, it is possible to protect the sub-muffler 88, and improve the appearance. It becomes compact.

As is clear from the above description, according to the present invention,
The engine and deceleration device, which are each configured separately, are rationally placed in the left and right center of the vehicle body and in the rear axle, so the engine and deceleration device are placed in areas where there is little shaking, especially in rough terrain four-wheeled vehicles. It is possible to centrally arrange and protect them.

Since the reduction gear is tilted upward from the rear, the overall length from the engine to the reduction gear can be shortened. Also, since the reduction gear is installed separately from the engine, maintenance of the reduction gear is easy, and the rear axle is located below the power transmission member provided between the engine and the reduction gear, so the reduction gear can be tilted arbitrarily and its overall length can be shortened. In addition, the exhaust muffler is placed horizontally above the deceleration gear so that it is approximately orthogonal to the longitudinal direction of the vehicle body, which contributes to shortening the longitudinal length of the vehicle body. Since the device and exhaust muffler are arranged, it can be protected by preventing deformation due to these external forces.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a four-wheeled motor vehicle for rough terrain, Fig. 2 is a plan view of the rear of the vehicle body, Fig. 3 is a partially cutaway plan view showing an enlarged view of the mounting structure of the engine and reduction gear, and Fig. 4 is the same side view. In addition, 1 in the drawing is a four-wheeled motor vehicle, 3, 3 is a front wheel, 4,
4 is the rear wheel, 5 is the seat, 8 is the engine, 9 is the reduction gear, 20, 20 is the main frame, 31, 31
is a rear roll bar, 82, 92, and 93 are belt converters, 88 is a sub-muffler, 94 is a rear wheel axle shaft, and C is a left-right center line of the vehicle body.

Claims (1)

[Scope of Claims] 1. In a four-wheeled vehicle for rough terrain in which two front and rear wheels are suspended on a frame extending from the front of the vehicle body to the rear, behind a seat disposed between the front and rear wheels, at the left and right center of the vehicle body, It is equipped with an engine and a reduction gear, which are each configured separately, and the engine and the reduction gear are connected on the sides, and the engine is placed in front of the left and right rear axles that extend from the reduction gear to both sides of the vehicle.
In addition, a reduction gear is arranged at the rear, and the reduction gear is arranged at an angle upward to the rear, and the rear wheel axle is arranged below the power transmission member provided between the engine and the reduction gear. The outer periphery of the device is surrounded by a frame, and above the reduction gear, inside the frame,
A four-wheeled motor vehicle for rough terrain characterized by an engine exhaust muffler arranged horizontally, substantially perpendicular to the longitudinal direction of the vehicle body.