JPH10250619A - Cabin support device for tractor, etc. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce instability caused by vertical vibration of a car body and a cabin frame by connecting one end of a bell crank to the car body side and connecting the other end to the cabin frame by intervening a damper extending along the front and rear direction. SOLUTION: The weight of a cabin 5 works on a pin 28 part of a bent part of a bell crank 2 in the front and rear fitting brackets 22, 23 parts. This constitution rotate the bell crank 2 downward about a support pin part for support brackets 24, 25 and a cabin frame 1 moves downward against the support pressure of each damper 4. The pressure of the damper 4 against a spring, etc., works in the front and rear direction so as to absorb the vibration. The vertical swinging distance by the weight of the cabin 5 is the vertical turning movement distance of the pin 28 part in the bend part of the bell crank 2 so as to reduce the deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cabin support device for supporting and mounting a cabin such as a tractor, and can be used for a cabin support device such as a combine.

[0002]

A cabin mounted on a tractor or the like requires the installation of a damper or suspension for vibration isolation. However, simply placing the cabin vertically with respect to the vehicle body requires a high vehicle height. It tends to be unstable.

[0003]

According to the present invention, one end of a bell crank 2 is connected to a vehicle body 3 and the other end is connected to a cabin frame 1 via a damper 4 extending in the front-rear direction. A cabin support device such as a tractor configured to support the cabin frame 1 at an intermediate portion between these two ends of the crank 2 is provided.

[0004]

The vibration between the vehicle body 3 and the cabin frame 1 is absorbed by the damper 4 via the bell crank 2 supporting the cabin frame 1 in the longitudinal direction. Therefore, instability due to the vertical vibration of the vehicle body 3 and the cabin frame 1 can be reduced, and the center of gravity of the cabin frame 1 can be lowered because the damper 4 is oriented in the front-rear direction. It can be installed low, and it is easy to miniaturize.

[0005]

In the example shown, a cabin 5 is mounted on a tractor body 3 in a four-wheel running mode.
An engine E is provided below, a clutch housing and a transmission case are rigidly connected to the rear side of the engine E, and rear axle housings 7 are provided on both left and right sides of a rear transmission case, and a rear axle housing is provided on an outer side. The wheel 8 is mounted on a shaft, and the vehicle travels while being driven by transmission from the engine E. A front axle bracket 9 is provided at the front of the engine E, and a front axle housing 6 is provided below.
Front wheels 11 which can be steered by a steering handle 10 are mounted on both side ends of the vehicle.

The cabin 5 is constructed so as to cover the driver's seat 12 at the rear from the steering handle 10 at the front and the dashboard 66 and a lower frame 13 supported along the vehicle body 3. On the upper side, a cabin floor 15 and fenders 14 on the left and right sides are provided on the upper side, and cabin posts 16 and 17 are erected from front and rear ends, and extend between upper ends of the posts 16 and 17. Roof 1
8 to provide a rigid structure of the cabin frame 1. 19 is a door on both sides, 20 is a windshield, 2
1 is a rear glass.

The lower frame 13 is mounted on the vehicle body 3 by using the bell crank 2 and the damper 4 to support the lower frame 13. At the front and rear portions of the lower frame 13, mounting brackets 22 and 23 project downward from both left and right sides. Body 3
On the side, a support bracket 24 is provided outside the clutch housing portion at the front of the floor, and a support bracket 25 is provided on the rear axle housing 7 at the rear. or,
Connecting brackets 26 and 27 are provided on the lower frame 13 at positions substantially facing the mounting brackets 22 and 23 in the front-rear direction, and these brackets 22, 23, 24, 25 and 2 are provided.
A bell crank 2, a damper 4, and the like are provided between 6, 27.

The bell crank 2 is bent in an L-shape, and this bent portion is rotatably mounted to the lower ends of the front and rear mounting brackets 22 and 23 on the lower frame 13 side by pins 28. One end of the bell crank 2 is attached to the support brackets 24 and 25 with pins 29, and the other end is attached to one end of the damper 4 with pins 30. Also, this bell crank 2
May be square or circular, and each of the pins 28, 2
What is necessary is that the arrangement of 9, 30 is at the triangular point of the bell crank 2 in a side view.

The damper 4 comprises a telescopic cylinder 31 as an absorber which can expand and contract against hydraulic pressure, and a spring 32 fitted on the outer periphery of the damper 4. One end of the telescopic cylinder 31 in the front-rear direction is connected to the bell crank. 2 with a pin 30 and the other end with a connection bracket 26, 27 of the lower frame 13 with a pin 33.
7 is tensioned back and forth by the spring 32, and the weight of the cabin 5 is supported by the hydraulic pressure of the pair of front and rear telescopic cylinders 31 and the elastic force of the spring 32. The telescopic cylinder 31
Has a small hole communicating between the cylinder head side and the piston rod side to the piston fitted in the cylinder, and restricts the expansion / contraction speed of the expansion / contraction cylinder 31 by the oil flow flowing to both sides through the small hole. Is what you do.

The pair of front and rear dampers 4 are provided horizontally in the front and rear direction.
Are provided in a front-back symmetric configuration. Each pin 2
8, 29, 30, etc., these pins 28,
A spherical bush 34 made of an elastic rubber material or the like is interposed between 29, 30 and the bell crank 2 fitted thereto.

The weight of the cabin 5 is reduced by the pins 28 at the bent portions of the bell crank 2 between the front and rear mounting brackets 22 and 23.
Work in the department. As a result, the bell crank 2 rotates downward about the support pins 29 with respect to the support brackets 24 and 25, and the cabin frame 1 attempts to move downward against the support pressure of each damper 4. Therefore, the damper 4
Compression against the spring 32 and the like is performed in the front-rear direction to absorb vibration. The vertical swing amount due to the weight of the cabin 5 is determined by the pin 28 at the bent portion of the bell crank 2 with respect to the pin 29.
It is the amount of vertical rotation of the part, and the amount of deviation can be reduced. The telescopic cylinder 31 and the spring 32, which can absorb vibration while expanding and contracting by the hydraulic resistance, are provided along the front-back direction. be able to.

3 differs from the above example in that the telescopic cylinder 31 of the damper 4 is provided with a hydraulic pump P driven by a motor M, a tank port T, and a large and small variable switchable by a solenoid output from a controller 35. A hydraulic circuit 40 composed of a switching valve 39 having orifices 36, 37, 38 and the like is connected so that the effectiveness of the damper 4 can be adjusted. As a result, the hardness of the suspension can be freely changed, and the suspension can be maintained fixed after expansion and contraction.

The hydraulic circuit 40 includes an area A on the cylinder head side with respect to the piston 41 of the telescopic cylinder 31;
Ports 43 and 44 are connected to area B on the piston rod 42 side.
And constitutes an orifice circuit 45 which can communicate between the ports 43 and 44. As a result, the two areas A and B are communicated via the orifices 36, 37 or 38 switched by the switching valve 39, and the orifices 36, 3
The expansion / contraction speed of the expansion / contraction cylinder 31 changes depending on the resistance of the oil flowing through 7 or 38.

The switching valve 39 is provided with a closed position N for closing the orifice circuit 45, whereby the expansion and contraction of the telescopic cylinder 31 can be stopped. or,
From the neutral position, the hydraulic circuit 40 applies the hydraulic pressure from the hydraulic pump P and the discharged hydraulic pressure to the tank port T from the neutral position.
A switching valve 46 for switching to B is provided, and switching can be performed by a solenoid output from the controller 35.

Since the dampers 4 are arranged on the front and rear sides on both left and right sides of the cabin 5, the hydraulic circuit 40 and the switching valve 46 as described above are provided for each damper 4, and the output from the controller 35 is provided. In this configuration, each of the telescopic cylinders 31 can be fixed by changing the amount of expansion and contraction, and the angle of the cabin 5 and the driver's seat 12 can be changed to the left, right, front and rear, etc. Can be adjusted.

In FIG. 4, a different point from the above example is that a final case 48 on which a rear axle 47 of a rear wheel is mounted is mounted on the rear end of the rear axle housing 7 at the rear part of the vehicle body 3 in the vertical direction around the rear axle housing 7. It is configured to be rotatable and to be resiliently turned downward by a torque spring 49. Reference numeral 50 denotes a shaft in the rear axle housing 7, which is interlocked with a rear wheel differential device in a transmission case of the vehicle body 3, and can transmit a rear axle 47 via a gear 51.

In the rotating portion of the final case 48 with respect to the rear axle housing 7, a lining 54 is interposed between a flange 52 at the tip of the rear axle housing 7 and a flange 53 on the side of the final case 48 for holding the same. The rotation resistance of the case 48 is configured to be large. 5 and 6, the point different from the above example is that the wheels such as the front wheels 11 and the rear wheels 8 are mounted on the lateral ends of the axle housing 55 on which the front wheels 11 and the rear wheels 8 of the vehicle body 3 are mounted. Final case 57 to wear 56
Is provided so as to be able to move up and down by a telescopic cylinder 58 which can be hydraulically expanded and contracted, so that vehicle height control and vehicle body horizontal control can be performed. At the end of the axle housing 55, a downward elbow housing 59 is provided, a rotatable spacer housing 60 is provided below the elbow housing 59, and a final case 57 is provided below this, and the final case 57 is provided. Has a steering arm 61 to which a tie rod is connected, and wheels are mounted on an axle 56 on the outside.

A pair of telescopic cylinders 58 are attached to the spacer case 60 so that the final case 57 can be moved up and down. These elbow housings 59
From the shaft 62 in the axle housing 55 to the wheel shaft 56, there are provided telescopic shafts 63 and 64, which extend from the rear case to the spacer case 60 and the final case 57. It can be extended and contracted by spline fitting according to the vertical movement, and it transmits rotation.

The vertical movement of each of the wheels 8 and 11 controls the expansion and contraction of the telescopic cylinder 58 by hydraulic pressure or the like based on the output from the controller. , The front and rear inclinations of the vehicle body 3 are controlled to control the front and rear horizontal, and the left and right inclinations are controlled to control the left and right horizontal.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a perspective view and a side view of a damper part, and a front sectional view of a part thereof.

FIG. 3 is a hydraulic circuit diagram of a damper showing a partially different embodiment.

FIG. 4 is a perspective view of a rear axle housing showing another embodiment, and a plan view of a part thereof.

FIG. 5 is a side view, a front view, and a front sectional view of an axle housing showing another embodiment.

FIG. 6 is a control flowchart thereof.

[Explanation of symbols]

 1 Cabin frame 2 Bell crank 3 Body 4 Damper

Continuing from the front page (72) Inventor Taketoshi Fujita 1-Etsukura-machi, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. 1) Inventor Hidekazu Tsuji 1 Yakura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd.

Claims (1)

[Claims] 1. One end of a bell crank 2 is connected to the vehicle body 3 and the other end is connected to a cabin frame 1 through a damper 4 extending in the front-rear direction. A cabin support device such as a tractor that supports the cabin frame 1 at an intermediate portion.