JPH0237672Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a swing arm device mainly applied to the front wheel side of a four-wheel drive off-road vehicle.

The applicant of the present invention has previously proposed a device of this kind, in which a pair of left and right wheels are provided on both outer sides of a cross member between the ends of a pair of left and right swing arms so as to be steerable via respective knuckles. It consists of a relatively longitudinally extending pipe-shaped main body on one side and a gear case on the other side connected to the end thereof, and a pair of left and right output shafts connected to the pair of wheels are installed in the gear case. We have proposed a type that includes a differential and other gear mechanisms connected to a propeller shaft that extends approximately along the arm, but in this case, one of the swing arms has the propeller shaft inserted into it to protect the shaft. Preferably, the straight arm is configured to be as straight as possible, and furthermore, the straight arm maintains a predetermined distance between the tip of the arm and the wheel on the outside, so that when the wheel is steered, that is, when the wheel is tilted from side to side, It is preferable not to interfere with this.

The purpose of the present invention is to obtain a device that meets such requirements, and a pair of wheels are installed on both outer sides of the cross member 3 between the tips of the swing arms 1 and 2 on one side and the other side. 4, 4 are provided so as to be freely steerable via respective knuckles 5, 5, and the cross member 3 is connected to a pipe-shaped main body 3a extending longitudinally on the one side.
and the gear case 3 on the other side bound to the end thereof.
a differential which connects both outer output shafts 6, 6 connected to the pair of wheels 4, 4 to a propeller shaft 7 extending substantially along the swing arms 1, 2 in the gear case 3b; In the type equipped with a gear mechanism 8 such as Elencial, the swing arm 2 on the other side is formed into a straight member into which the shaft 7 is inserted, and the tip thereof is inserted into the gear case 3b. It is formed by binding it near the end.

This figure shows a case in which the vehicle is applied to a four-wheel drive vehicle for off-road use, and as shown in FIGS. 1 and 2, the vehicle as a whole consists of a vehicle frame 21, and there are The model is equipped with an engine 9, a fuel tank 10 behind it, a seat 11 for the passenger above it, and a steering handle 12 in front of it. A pair of wheels 4, 4 are provided, and a pair of wheels 14 are provided at the rear thereof via swing arms 13, 13 on one side and the other side in substantially the same way.
14, and is driven via a propeller shaft 15 through which one of the arms 13, 13 is inserted, in substantially the same way as the wheels 14, 14. The shaft 15 and the shaft 7 described above are connected to the engine 9 through an intermediate propeller shaft 16 that extends in the longitudinal direction from the side surface of the engine 9, and furthermore, the swing arms 1 and 2 are connected to the engine 9. A pair of front cushions 1 on the left and right on the upper side
7, 17, and the swing arms 13, 13 are provided with a common rear action 18 above them.

The details of the swing arms 1, 2, the cross member 3, etc. are clearly shown in FIGS. 3 and 4, for example, and in this case, the arm 1 on the right side in the drawing is not particularly different from the conventional one The tip is bent outward and attached to the vicinity of the outer end of the main body 3a on the right side in the drawing, and a predetermined distance 19 is maintained between it and the wheel 4 on the side thereof. The arm 1 is formed in a straight shape so as to pass through the shaft 7, and is tied near the inner end of the gear case 3b on the left side in the drawing, so that there is a gap 19 between the arm 1 and the wheel 4 on the side thereof.
The wheels 4 are held so as not to interfere with them when steering the wheels 4.

Furthermore, in the illustrated gear mechanism 8, a ring gear 8a, differential pinions 8c, 8c in a differential case 8b accompanying this, and a pair of left and right differential side gears 8d, 8d on each output shaft 6, 6 that mesh with the ring gear 8a.
The ring gear 8a is connected to the gear case 3.
The propeller shaft 7 is positioned at the inner end side of the propeller shaft 7 so as to be engaged with the drive gear 7a at the tip of the propeller shaft 7 described above.

Each output shaft 6 is connected to the axle 4a of each wheel 4 via each universal joint 20, and each knuckle 5 is fitted into each knuckle holder 5a and supported thereon by each king pin 5b.

To explain its operation, when the vehicle is running, the left and right wheels 4, 4 are allowed to move up and down on the swing arms 1, 2, and follow the unevenness of the road surface.
The wheels 4, 4 are driven by a drive shaft 7 via a gear mechanism 8, and are freely steerable at each knuckle 5, 5. This point is not particularly different from the conventional wheels, but there are some differences in such operation. One of the swing arms 1 and 2, that is, the arm 2, is formed in a straight shape so that the shaft 7 can be inserted therethrough, and also acts as a cover for the outer periphery of the shaft 7, and furthermore, the tip thereof is located near the inner end of the gear case 3b. and has a spacing 19 between the wheel 4 and the wheel 4 on the side thereof, and thus the wheel 4
Since the gear case 3b itself is formed with relatively high strength, it projects longitudinally outward from the tip of the arm 2 and connects to the wheel 4 at the outer end of the gear case 3b. Although a relatively large bending moment is applied due to the road reaction force, this can be sufficiently resisted.

In this way, according to the present invention, one of the left and right swing arms 1 and 2, that is, the arm 2 on the other side, is configured as a straight member into which the propeller shaft 7 is inserted. Furthermore, the arm 2 has its distal end connected to the gear case 3b on the other side of the cross member 3 near its inner end, so that the arm 2 can be housed in the outer wheel. A predetermined distance 19 is maintained between the gear case 3b and the gear case 3b, so that there is no interference when the wheels 4 are steered, that is, tilted from side to side, and the gear case 3b itself has relatively high strength. It has the advantage that it will not be damaged even by a relatively large bending moment due to road reaction force.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a vehicle equipped with the proposed device;
The figure is a partially removed perspective view, FIG. 3 is an enlarged partially cut-away plan view of the main part, and FIG. 4 is a cross-sectional view taken along the line -2. 1, 2...Swing arm, 3...Cross member, 4, 4...Wheel, 5, 5...Natsukuru, 3a
...Main body, 3b... Gear case, 6, 6... Output shaft, 7... Propeller shaft, 8... Gear mechanism.

Claims (1)

[Scope of utility model registration request] A pair of wheels 4, 4 are installed on both outsides of the cross member 3 between the tips of the swing arms 1, 2 on one side and the other side.
The cross member 3 is provided with a pipe-shaped main body 3a extending longitudinally on one side, and a gear case 3b on the other side connected to the end thereof. and a differential element in the gear case 3b that connects both outer output shafts 6, 6 connected to the pair of wheels 4, 4 to a propeller shaft 7 extending substantially along the swing arms 1, 2. In the case of a type equipped with a gear mechanism 8 such as a shaft, the swing arm 2 on the other side is formed into a straight member through which the shaft 7 is inserted, and the tip thereof is connected to the inner end of the gear case 3b. A swing arm device for a vehicle that is attached to the vicinity.