JPH0451091Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wheel suspension structure for a working vehicle mainly used for agricultural or civil engineering purposes.

[Conventional technology]

Conventionally, as a suspension structure with the above configuration,
As shown in Publication No. 161726, a frame supporting the wheels is formed into a gate shape, and a transmission system such as a differential device and a transmission shaft is disposed below this frame, and the frame is connected via a spring or the like. Many are installed in the vehicle frame.

[Problem that the invention attempts to solve]

In general, agricultural or civil engineering work vehicles often travel on rough terrain. In particular, in the case of agricultural transport vehicles, the wheels often sink into the ground when going over ridges or on soft ground, which tends to cause problems such as contacting the transmission system such as the differential device and the transmission shaft with the ground and damaging it.

Therefore, in order to avoid contact between the transmission system and the ground, it is effective to install the differential device, transmission shaft, etc. at a high level, but this also causes another disadvantage of raising the center of gravity of the vehicle body. Ta.

The present invention was developed in view of the above circumstances, and it prevents damage to the transmission system such as the differential device and transmission shaft without raising the center of gravity of the vehicle by rationally arranging the parts that make up the wheel suspension structure. The purpose is to prevent

[Means for solving problems]

The feature of this invention is that a pair of front and rear suspension frames whose left and right ends are connected are supported by the main frame via a pair of left and right elastic suspension mechanisms, and one of the front and rear suspension frames is configured in a straight line. , a portal-shaped arch portion projecting upward is formed in the left and right center portions of the other suspension frame, and this arch portion and the left and right center portions of one suspension frame are connected by an L-shaped frame, and a differential device is attached to this L-shaped frame. An axle that is suspended and connected and supported on both left and right ends of the suspension frame, and an operating shaft that projects on the left and right sides of the differential device are arranged between a pair of universal joints and the front and rear suspension frames. It is interlocked with the shaft, and its functions and effects are as follows.

[Effect]

That is, as described above, the differential device is suspended and connected to the L-shaped frame that connects the portal-shaped arch formed in the left and right center portions of one suspension frame upwardly protruding from the other suspension frame. Therefore, the differential device can be stored and deployed in the space formed by the upwardly protruding portal arch and the L-shaped frame, and the differential device can be stored and installed on the underside of the suspension frame without increasing the vehicle height. It can be installed in a state where it is raised to a level approximately equal to that of the Furthermore, by setting the lower surface of the differential device approximately at the same level as the lower side of the suspension frame, at least a portion of the transmission shaft connected to the differential shaft of the differential device can be set higher than the level of the suspension frame. , an operating shaft, and a universal joint can be arranged between the front and rear suspension frames. Furthermore, since a portal-shaped arch is formed on the suspension frame,
The input shaft to the differential device can also be set at a high level by passing through this arch.

[Effect of idea]

Therefore, even though the structure is not designed to raise the center of gravity of the vehicle without the use of special members through rational arrangement of parts, the suspension frame protects the transmission system when driving on rough terrain, and the transmission system It has now been possible to prevent damage to the

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in Fig. 9, a vehicle body with a cabin A containing a steering handle 1 and a seat 2 at the front and a loading platform 3 at the rear is provided with front and rear propulsion wheels 4, 4, and is used as an example of a working vehicle for agricultural use. A transport vehicle is configured.

An engine 5 and a transmission case 6 are mounted in a connected manner approximately in the center of the vehicle body, and power is supplied from the transmission case 6 to differential devices 7, 7 provided at the front and rear of the vehicle body, thereby controlling the wheels 4, 4. is driven.

As shown in FIGS. 1 to 8, front and rear wheels 4,
The suspension structures of No. 4 are substantially equally constructed. In other words, a pair of front and rear suspension frames 8 and 9, whose left and right ends are connected to each other, are connected to the main frame 1 of the vehicle body.
0 and 10 are supported via a pair of left and right elastic suspension mechanisms 11 and 11 made of leaf springs, and an arch portion B is formed in the center of the front and rear suspension frames 8 and 9, which are located inside the vehicle body. Furthermore, this arch part B and the other suspension frame 8
The L-shaped frame 12 is attached over the length of the frame 8 and 9 to connect the respective frames 8 and 9. The differential device 7 is suspended and connected to this L-shaped frame 12, and an axle 4a supported at both left and right ends of the suspension frames 8 and 9, and a differential shaft protruding from the left and right sides of the differential device 7. 7a and a pair of universal joints 13,
13 and a transmission shaft 14 disposed between the front and rear suspension frames 8 and 9.

As shown in FIGS. 1 and 4, in the front wheel suspension structure, the knuckle arm 15 and tie rod 16 on the wheel 4 side are
In addition, as shown in FIGS. 5 and 6, in the rear wheel suspension structure, plate-like bodies 17, 17 are provided near the left and right ends of the lower surfaces of the front and rear suspension frames 8, 9. The transmission shaft 14 and the universal joint 13 are protected by being stretched. In the suspension structure of the front and rear wheels, shock absorbers 18, 18 are provided between the left and right ends of the suspension frames 8, 9 and the main frames 10, 10, and rubber stoppers are provided to restrict the upward movement of the wheels 4. 19, 19 are provided.

[Another example]

In this embodiment, the work vehicle was configured as a four-wheel drive type, but it may be configured with either the front or rear wheels as a drive structure, or the work vehicle may be a rice transplanter or the like other than a transport vehicle. It's okay if it's hot.

[Brief explanation of the drawing]

The drawings show an embodiment of the wheel suspension structure for a working vehicle according to the present invention, in which FIG. 1 is a plan view showing the front wheel suspension structure, FIG. 2 is a view taken along the - arrow in FIG. 1, and FIG. 1, FIG. 4 is a sectional view taken along the line - in FIG. 1, FIG. 5 is a plan view showing the rear wheel suspension structure, FIG. 7th
FIG. 5 is a sectional view taken along the - line in FIG. 5, FIG. 8 is a sectional view taken along the - line in FIG. 5, and FIG. 9 is an overall side view of the transport vehicle. 7... Differential device, 8, 9... Front and rear suspension frames, 10... Main frame,
DESCRIPTION OF SYMBOLS 11... Elastic suspension mechanism, 12... Arch-shaped frame, 13... Universal joint, 14... Transmission shaft, B... Arch part.

Claims (1)

[Scope of utility model registration request] A pair of front and rear suspension frames 8,9 whose left and right ends are connected to each other are supported by main frames 10,10 via a pair of left and right elastic suspension mechanisms 11,11.
One of the suspension frames 8 is configured in a straight line, and a portal-shaped arch portion B that projects upward is formed at the left and right center portions of the other 9, and this arch portion B and the left and right center portion of one suspension frame 8 are connected to each other. The L-shaped frame 12
an axle 4a connected to the L-shaped frame 12 with a differential device 7 suspended therefrom and supported on both left and right ends of the suspension frames 8 and 9;
A transmission shaft 14 in which a differential shaft 7a protruding from the left and right sides of the differential device 7 is arranged between a pair of universal joints 13, 13 and front and rear suspension frames 8, 9.
A wheel suspension structure for a work vehicle that is interlocked and connected.