JPH0440965Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is designed to attach a wheel case, which has running wheels attached to both left and right ends, to the aircraft body at an offset position in the left-right direction, and to rotate the wheel case around the axis in the longitudinal direction of the aircraft body. This invention relates to a wheel rolling device for a working vehicle, which is mounted so as to be relatively swingable and is elastically biased to maintain the relative position of the wheel case and the vehicle body by installing spring members between the vehicle body and both ends of the wheel case.

[Conventional technology]

In the case of a work vehicle such as a riding rice transplanter, the vehicle case is configured to roll relative to the machine body so that the machine body is maintained as horizontally as possible regardless of the horizontal inclination of the running ground.

Further, in order to restore the swinging motion of the wheel case and maintain the machine body and wheel case at the set positions, spring members are conventionally installed between the machine body and the wheel case on both sides of the pivot portion of the wheel case.

By the way, in the case of this type of work vehicle, the wheel case is slightly offset in the three left and right directions of the machine body because the transmission shaft that transmits the driving force to the seedling planting device etc. needs to be located approximately at the center in the width direction of the machine body. Therefore, conventionally, two types of spring materials with different elastic modulus were used, and a spring material with a smaller elastic modulus was used between the end of the wheel case farthest from the pivot point and the aircraft body. A spring material with a large elastic modulus was installed between the end of the wheel case near the pivot and the fuselage to maintain left and right balance.

[Problem that the invention attempts to solve]

When installing two different types of spring materials between the aircraft body and the wheel mounting member, there are cases where the spring materials are installed on the opposite side by mistake.
It is necessary to prepare.

The purpose of the present invention is to prevent mistakes in the attachment of spring materials and to reduce manufacturing costs, management costs, etc.

[Means for solving problems]

The characteristic configuration of the present invention is that, in the above-mentioned wheel rolling device for a work vehicle, the spring materials are formed with the same specifications, but the mounting positions of the spring materials on the wheel case or the machine body are different, and the operation and effects thereof are as follows. is as follows.

[Function] By using spring materials with the same specifications and changing their mounting positions, the lengths of both spring materials can be changed and the elastic force of both spring materials can be made different. Even if the pivot shaft is attached, the spring material should be shortened between the end of the wheel case farthest from the pivot shaft and the fuselage to reduce the elastic force of the spring material, and vice versa. By attaching a long spring material between the end of the wheel case near the shaft and the aircraft body so that the elastic force of the spring material is large, the elastic force of both spring materials can be used to prevent the wheel case from expanding. The moment force acting between both ends and the fuselage can be made almost equal, and even if the spring materials have the same specifications, the left-right balance of the restoring force after the wheel case and the fuselage swing relative to each other is harmonized even if the spring materials are of the same specifications. can be done.

[Effect of idea]

Since the spring materials have the same specifications, there is no need to erroneously attach the spring materials to the left and right mounting points, and there is no need to be careful when installing the spring materials, improving work efficiency when installing the spring materials. can. In addition, there is no need to manufacture two types of spring materials as in the past, and manufacturing costs, management costs, etc. can be reduced.

〔Example〕

As shown in FIG. 5, a hydraulic cylinder 6 is installed at the rear of a traveling body 3 capable of driving a pair of left and right front traveling wheels 1, 1 and a pair of rear traveling wheels 1, 1.
A riding-type rice transplanter shown as an example of a working vehicle is constructed by connecting a seedling planting device 8 via a link mechanism 7 that is operated to swing up and down. At the front of this aircraft 3 is an engine 9 and a front transmission case 1.
0 is provided, a driving section 11 is provided in the center, and a rear wheel case 2 with a built-in differential mechanism is provided at the rear of the fuselage 3.
The output from the transmission case 10 is transmitted from the front transmission case 10 to the output shaft 13, and from the output shaft 13 via the differential mechanism in the rear wheel case 2 to the wheels 1 attached to both sides of the transmission case 2. ing.

To explain the structure of the frame of Aircraft 3 in detail,
As shown in FIG. 2, a pair of reinforcing frames 16, 16 are arranged below the left and right main frames 14, 15, which are long in the longitudinal direction of the fuselage 3, and are substantially parallel to the main frames 14, 15. A front stay 17 and rear stays 18a, 18b are fixed to the front and rear ends of the main frames 14, 15 and the reinforcing frame 16, respectively.
5. Reinforcement frame 16 and front and rear stays 17, 18
A and 18b form a strong frame 19. The front transmission case 10 is attached to the front end of the frame 19, and the wheel case 2 serving as the rear transmission case is swingably attached to the rear end of the frame 19. The output shaft 13 and the transmission shaft 20 pass through the frame 19.

Next, the support structure of the wheel case 2 will be explained. As shown in FIGS. 1 and 2, a wheel case 2 is disposed between a front rear stay 18a and a rear rear stay 18b, which are attached between the left and right main frames 14 and 15. 18a, 18b
The shaft hole 21 is provided at a slightly eccentric position in the left-right direction.
through the output shaft 13 connected to the wheel case 2,
With this output shaft 13 as a pivot point P, the wheel case 2 can be rolled left and right relative to the body 3. Mounting portions 2 provided at the outer ends of the main frames 14 and 15
2, 22 and attachment portions 23, 23 provided at both ends of the wheel case 2, tension-biased spring members 4, 4 of the same specification are attached. Here, the spring members 4, 4 are attached to the main frame 14 by hooking and locking the hook portions 24 at both ends of the spring members 4, 4 to both the mounting portions 22, 23 formed by holes. 1
5 and the wheel case 2.

In this way, since the wheel case 2 is pivoted at an eccentric position in the left-right direction of the fuselage 3, from this pivot point P to both spring members 4, 4 attached to the ends of both frames 14, 15. Therefore, if the elastic force of both spring materials 4, 4 is the same, the moment force acting on the attachment points of both spring materials 4, 4 will be different, and the distance between the body 3 and the wheel case 2 will be different. This will cause a bias in relative rocking, but the spring material 4 attached to the end of the main frame 15 on the side closer to the pivot point P is attached to the end of the main frame 14 on the side farther from the pivot point P. It is attached so that its length is longer than that of the attached spring member 4, and the moment force acting on the attached portions of both spring members 4, 4 is set to be equal. Therefore, the body 3 and the wheel case 2 swing from side to side in a balanced state.

Further, by using a spring material with a small spring constant as the spring material 4, the feeling felt by the body when the aircraft body 3 rolls can be made even better. That is, the spring material 4 conventionally used has a large spring constant, and the end of the spring material 4 is provided with a material shown in FIG. A hook portion 24 having a long dimension as shown is provided, and the hook portion 2
4 and the attachment parts 22, 23 of the spring material 4, but when the conventional spring material 4 was used, the airframe 3 and the mounting portions 22 and 23 of the spring material 4 would When the wheel case 2 is tilted at a certain angle from a horizontal state, the load on the spring member 4 is large, and the body is subjected to a strong restoring force. Therefore, as mentioned above, the spring material 4 with a small spring constant
By using the initial deformation, it is possible to equalize the spring force applied to the aircraft 3 when it is horizontal and when it is tilted, as shown by curve A in Figure 4, and it is also possible to reduce the restoring force received after it is tilted. This makes it possible to improve the feeling during rolling. In addition, in order to not increase the load acting on the spring material 4 at the maximum inclination, the hook portion 2 of the spring material 4 is
There is also the advantage that the strength of the support pins 23 and 4 can be increased.

[Another example]

In the above embodiment, by making the dimensions of the mounting portions 23, 23 provided on both sides of the wheel case 2 different from the main frames 14, 15,
Although the lengths of the spring members 4 are changed, the lengths of both the spring members 4 may be changed by changing the mounting positions of the spring members 4 on the main frames 14 and 15. Further, the present invention can be applied to rolling idle wheels. Furthermore, in addition to rice transplanters, the present invention can also be applied to various work vehicles such as tillers and agricultural tractors.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the wheel rolling device for a working vehicle according to the present invention, and FIG.
The figure is a longitudinal side view showing the frame configuration of the aircraft.
The figure is a front view of the spring material, FIG. 4 is a graph showing the spring load, and FIG. 5 is an overall side view of the riding-type rice transplanter. 1... Traveling wheel, 2... Wheel case, 3...
Aircraft, 4...spring material.

Claims (1)

[Scope of utility model registration request] A wheel case 2 with traveling wheels 1 attached to both left and right ends is attached to the fuselage 3 at an offset position in the left-right direction so as to be able to swing relative to each other around an axis P in the longitudinal direction of the fuselage. A wheel rolling device for a working vehicle, in which spring members 4, 4 are respectively attached between both ends of the wheel case 2 and the vehicle body 3, and are elastically biased to maintain the relative positions of the wheel case 2 and the body 3.
4 with the same specifications, wheel case 2 or fuselage 3
A wheel rolling device for a work vehicle in which the mounting positions of spring members 4, 4 are different.