JP2001258309A - Tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the possibility of damage of a lift rod sensor for detecting the expansion and contraction position of a lift rot cylinder by the contact of the lift rod sensor with an obstacle and an operation part in a tractor equipped with the lift rod cylinder. SOLUTION: In this tractor in which a lifting and lowering link mechanism 11 for attracting the operation part 5 to the rear of a machine body is hung through a pair of right and left lift rods 12 from a lift arm 13, either the right or left lift rod 12 is provided with the lift rod cylinder 14 and the operation part 5 is inclined right and left based on the expansion and contraction of the lift rod cylinder 14, when the lift rod sensor 17 for detecting the expansion and contraction position of the lift rod cylinder 14 is installed, a sensor main body 17a of the lift sensor 17 is set at the rear of the machine body and the amount of the expansion and contraction action of the lift rod cylinder 14 is transmitted through an inner wire 17c to the sensor main body 17a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of a tractor having a lift rod cylinder.

[0002]

2. Description of the Related Art In general, among such tractors, a lifting link mechanism for mounting a working unit behind the machine is suspended by a lift arm via a pair of left and right lift rods. A lift rod cylinder is interposed, and the working part is inclined left and right based on the expansion and contraction of the lift rod cylinder.However, when automatically controlling the left and right inclination of the working part based on the expansion and contraction of the lift rod cylinder, In addition, it is required that a lift rod sensor for detecting the extension / contraction position of the lift rod cylinder be provided, and a detection signal of the lift rod sensor be fed back to the control unit.

[0003]

Therefore, conventionally, a stroke sensor has been adopted as a lift rod sensor and the stroke sensor has been directly mounted on the lift rod cylinder. Since it is a movable part that moves up and down with the operation or is near the working part, there is a possibility that it may be damaged by contacting an obstacle or the working part.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve these problems in view of the above situation, and has a lifting link mechanism for mounting a working unit at the rear of the machine. With a lift arm via a pair of left and right lift rods, a lift rod cylinder is interposed on one of the left and right lift rods, and a tractor that tilts the working unit left and right based on the expansion and contraction of the lift rod cylinder. In providing the tractor with a lift rod sensor for detecting the extension / retraction position of the lift rod cylinder, the lift rod sensor is provided at a rear portion of the fuselage,
The present invention is characterized in that the amount of expansion / contraction movement of the lift rod cylinder is transmitted to a lift rod sensor via a wire member. That is, since the lift rod sensor can be attached to a non-movable part (excluding movement due to traveling) and at a position away from the working part, damage due to contact with an obstacle or the working part is prevented as much as possible. be able to. In addition, the lift rod cylinder and the lift rod sensor are separately arranged left and right in rear view, and an intermediate portion of a wire member connecting the lift rod cylinder and the lift rod sensor is arranged along the lift arm support shaft. It is assumed that. That is, the minimum bending radius of the wire member can be secured by appropriately separating the lift rod cylinder and the lift rod sensor, and the intermediate portion of the wire member is aligned with the lift arm support shaft. The load in the push-pull direction acting on the wire member at the time of operation can be absorbed by the torsional deformation of the wire member, and as a result, a disadvantage that a large detection error occurs based on the load can be avoided.

[0005]

Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling body of a tractor. The traveling body 1 includes a transmission case 2 for inputting engine power, front wheels 3 and rear wheels 4 that are driven to rotate by traveling power output from the transmission case 2, and a transmission. P that supplies the working power output from the case 2 to a working unit 5 described later
The vehicle includes a TO shaft 6, a driver's seat 7 provided on the rear upper side of the fuselage, and the like. 9 and a hydraulic case 10 which will be described later.

An elevating link mechanism 11 is provided at the rear of the traveling body 1 so as to be able to swing up and down. At the rear end of the elevating link mechanism 11, a working unit 5 such as a rotary is selectively mounted. You can do it. And a pair of left and right lower links 1 constituting the lifting link mechanism 11
1a is suspended by a pair of left and right lift arms 13 via lift rods 12, respectively.
The working unit 5 moves up and down in accordance with the elevating operation, while the working unit 5 tilts left and right in accordance with the expansion and contraction operation of the lift rod cylinder 14 interposed between the left and right lift rods 12.

A lift arm support shaft 15 is provided at the rear end of the hydraulic case 10 so as to penetrate in the left-right direction. The lift arm support shaft 15 has the lift arms 13 at its left and right ends. On the other hand, an operation arm (not shown) integrally connected to the lift cylinder 16 is integrally provided at the intermediate portion. Therefore, the lift arm support shaft 15 rotates in accordance with the expansion and contraction operation of the lift cylinder 16, and the lift arm 13 moves up and down integrally following the support shaft rotation. Are as before.

Reference numeral 17 denotes a lift rod sensor for detecting the extension / retraction operation position (cylinder length) of the lift rod cylinder 14. The lift rod sensor 17 includes a sensor body 17a having a displacement sensor such as a potentiometer built therein.
Inner wire 17c inserted into outer tube 17b
Are connected to form a wire-type displacement sensor assembly. The sensor body 17a is attached to the rear surface of the rear cover 9 while the outer tube 17b and the inner wire 17c extending from the sensor body 17a are provided.
The outer tube 17b is fixed to the cylinder 14a side of the lift rod cylinder 14 via an outer receiver 18, while the outer tube 17b is fixed to the cylinder 14a side. The distal end of the inner wire 17c protruding from the distal end of the tube 17b is connected to the piston rod 14b of the lift rod cylinder 14.
Fixed on the side. That is, lift rod cylinder 1
In providing the lift rod sensor 17 for detecting the extension / retraction operation position of the actuator 4, the amount of extension / retraction of the lift rod cylinder 14 is transmitted to the sensor body 17a via the inner wire 17c. (Excluding movement due to traveling) and can be attached to the rear part of the aircraft remote from the working unit 5, and as a result, it is possible to avoid the disadvantage that the lift rod sensor 17 is damaged by contact with obstacles or the working unit 5. ing.

When the sensor body 17a of the lift rod sensor 17 is provided at the rear part of the machine body, the sensor body 17a and the lift rod cylinder 14 are disposed so as to be divided right and left in a rear view.
The intermediate portion between the outer tube 17b and the inner wire 17c connecting the sensor arm 17 with the sensor body 17a is connected to the lift arm support shaft 1.
It is routed along line 5. Therefore, the minimum bending radius of the outer tube 17b and the inner wire 17c can be secured by appropriately separating the lift rod cylinder 14 and the sensor main body 17a, and the intermediate portion between the outer tube 17b and the inner wire 17c is connected to the lift arm support shaft. 15, the load in the push-pull direction acting on the outer tube 17b and the inner wire 17c during the operation of the lift arm can be absorbed by the torsion deformation of the outer tube 17b and the inner wire 17c. Thus, it is possible to avoid a disadvantage that a large detection error is caused based on the above.

In addition, since the sensor body 17a is mounted on the left and right sides with the fender 8 and the upper part with the rear cover 9, the sensor body 17a can be installed without a special cover member. Can be protected as much as possible, and the mounting position is deviated to the left or right with respect to the left and right center of the body, so that the mounting position can be adjusted even when the working unit 5 is mounted. Maintenance can be performed easily.

Reference numeral 19 denotes a lift arm sensor (potentiometer) for detecting a lifting operation position (arm angle) of the lift arm 13. The lift arm sensor 19 is provided on one side of the hydraulic case 10 with a sensor bracket. 20 and is connected to one end of the lift arm support shaft 15 via a connector (not shown). In other words, the lift arm sensor 19 detects the rotational displacement of the lift arm support shaft 15, but the upper part and the rear part of the sensor are covered with a reinforcing plate 21 provided in the sensor bracket 20 and having an inverted L-shape in side view. Have been done.

On the other hand, reference numeral 22 denotes a tillage depth sensor (potentiometer) provided in the working unit 5. The tillage depth sensor 22 is a rear cover (flat plate) 5 a provided at the rear of the working unit 5 so as to be vertically swingable. Through a connecting rod 23. That is, the tillage depth sensor 22 detects the swing displacement of the rear cover 5a due to the change in the tillage depth of the working unit 5,
The detection signal of the tillage depth sensor 22 includes a working part side wiring (not shown) extending from the tillage depth sensor 22, a working part side tillage depth coupler (not shown) provided at the tip of the working part side wiring, The control unit 26 on the traveling body 1 side via the body side deepening coupler 24 to which the working part side deepening coupler can be detachably connected, the body side deepening wiring 25 extending from the body side deepening coupler 24, and the like. To be entered.

By the way, in mounting the body side deepening coupler 24 to the rear part of the body, in the present embodiment, it is mounted on the body side deepening coupler 24 using the reinforcing plate 21 of the sensor bracket 20. Therefore, the fuselage side deepening coupler 24
The number of parts can be reduced by eliminating the need for a special bracket for mounting
Since it is on the outer side of the lift arm 13, the workability at the time of attaching and detaching the coupler can be improved as compared with the case where the body side deepening coupler 24 is arranged between the left and right lift arms 13.

In the apparatus constructed as described above, the elevating link mechanism 11 for mounting the working unit 5 at the rear of the machine body.
Is suspended by a lift arm 13 via a pair of left and right lift rods 12, and the lift rod 12
A lift rod cylinder 14 is interposed, and the working unit 5 is tilted left and right based on the expansion and contraction of the lift rod cylinder 14. In providing a lift rod sensor 17 for detecting the expansion and contraction position of the lift rod cylinder 14,
The sensor body 17a of the lift rod sensor 17 is provided at the rear of the machine body, and the amount of expansion and contraction of the lift rod cylinder 14 is transmitted to the sensor body 17a via the inner wire 17c. In addition, it is possible to mount the sensor unit 14 at a position away from the work unit 5, and as a result, it is possible to avoid contact with an obstacle or the work unit 5 and to prevent damage to the sensor body 14 a.

Further, the lift rod cylinder 14 and the sensor main body 17a are separately arranged on the left and right sides in rear view, and an intermediate portion between the outer tube 17b and the inner wire 17c connecting the lift rod cylinder 14 and the sensor main body 17a is lift arm. Since the lift rod cylinder 14 and the sensor main body 17a are appropriately separated from each other because of being aligned with the support shaft 15, the outer tube 17b and the inner wire 17c are separated.
In addition, the minimum bending radius of the outer tube 17b and the inner wire 1c can be secured when the lift arm is actuated by arranging the intermediate portion of the outer tube 17b and the inner wire 17c along the lift arm support shaft 15.
The load in the push-pull direction acting on 7c can be absorbed by the torsion deformation of the outer tube 17b and the inner wire 17c, and as a result, a disadvantage that a large detection error is caused based on the load can be avoided.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a side view of a rear part of the body showing a mounting state of a lift rod sensor.

FIG. 3 is a rear view of the same.

FIG. 4 is a plan view of the rear part of the fuselage showing a mounting state of the deep working coupler.

FIG. 5 is a side view of a main part of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 5 Working part 9 Rear cover 11 Lifting link mechanism 12 Lift rod 13 Lift arm 14 Lift rod cylinder 15 Lift arm support shaft 17 Lift rod sensor 17a Sensor main body 17b Outer tube 17c Inner wire

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tatsuhiko Nojima 667 Iya-cho, Oji-machi, Higashi-Izumo-cho, Yatsuka-gun, Shimane 1 Inside Mitsubishi Agricultural Machinery Co., Ltd. No. 1 Mitsubishi Agricultural Machinery Co., Ltd. 667 1 Mitsubishi Agricultural Machinery Co., Ltd. (72) Inventor Masaki Uyama 667 Idaicho, Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 F-term in Mitsubishi Agricultural Machinery Co., Ltd. F-term (reference) QB06 RA10

Claims (2)

[Claims] A lifting link mechanism for mounting a working unit behind the machine body is suspended by a lift arm via a pair of left and right lift rods, and a lift rod cylinder is provided on one of the left and right lift rods. A tractor that tilts a working unit in the left-right direction based on the expansion and contraction of the lift rod cylinder, and when the tractor is provided with a lift rod sensor that detects an expansion and contraction position of the lift rod cylinder, the lift rod sensor is provided at a rear part of the machine body. And a tractor that transmits an amount of expansion and contraction of the lift rod cylinder to a lift rod sensor via a wire member. 2. The lift arm cylinder and the lift rod sensor according to claim 1, wherein the lift rod cylinder and the lift rod sensor are separately arranged left and right as viewed from the rear, and an intermediate portion of a wire member connecting the lift rod cylinder and the lift rod sensor is supported by a lift arm support. A tractor characterized by being arranged along an axis.