JP3048869B2 - Mounting structure of a lever angle detection sensor in a working vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a lever angle detection sensor in a working vehicle such as a tractor.

[0002]

2. Description of the Related Art In general,
In this type of traveling vehicle, a lever angle detection sensor that detects an operation angle of the operation lever is provided in a space below a lever guide that covers a base end portion of the operation lever, and a detection signal of the lever angle detection sensor is provided. Is input to a control device via a cable with a coupler. However, conventionally, since the operation lever support shaft and the lever angle detection sensor are separately mounted on separate members, workability at the time of assembling is not inferior, and fine adjustment such as alignment is required after assembling the machine. was there. Conventionally, a cable is pulled out from the lower portion of the lever angle detection sensor, and a coupler provided at the end of the cable is connected to a coupler on the cable side. Therefore, a hanging coupler connection portion interferes with an obstacle. Or could escape from the space covered by the lever guide and allow water to enter.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a mounting structure of a lever angle detection sensor in a working vehicle that can eliminate these problems. A lever angle detection sensor for detecting an operation angle of the operation lever is provided in a space below the lever guide covering a base end portion of the operation lever, and a detection signal of the lever angle detection sensor is provided with a coupler. In a working vehicle that is input to the control device via a cable, a substantially U is provided in a space below the lever guide.
A bracket having a U-shape is provided, and a support shaft of the operation lever is mounted on one of the opposing surfaces of the bracket, and a lever angle detection sensor integrally provided with a coupler is mounted on the other opposing surface of the bracket. Are assembled in a posture facing upward. The present invention makes it possible to assemble the operation lever support shaft and the lever angle detection sensor as one assembly in advance by this configuration, to improve workability at the time of assembling, and to perform fine adjustment after assembling the machine. In addition, since the coupler-integrated lever angle detection sensor is assembled with the coupler facing upward, it is possible to prevent the coupler connecting portion from interfering with obstacles and inconvenience of water entering the coupler connecting portion. Things.

[0004]

Next, an 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, and a rotary tilling type working unit 3 is connected to a rear portion of the traveling body 1 via a lifting link mechanism 2 so as to be able to move up and down. The working unit 3 moves up and down as the lift arm 4 swings up and down, and inclines left and right as the lift rod 5 expands and contracts. All of these basic configurations are the same as before.

[0005] A rear cover 6 functioning as a leveling plate or a tillage depth detecting member is provided at the rear end of the working section 3 so as to be vertically swingable. It is configured to be movable (movable up and down) along an arc and to be forcibly moved based on the expansion and contraction operation of the electric cylinder 8. In other words, it is possible to control the movement of the rear cover 6 functioning as a leveling plate or a tillage depth detector to an appropriate position according to the tillage depth.
A rear cover position sensor 9 (potentiometer) for detecting the moving position of the vehicle and a tillage depth sensor 10 (potentiometer) for detecting the swing angle of the rear cover 6 are provided on the traveling body 1 side, and are also connected via wires 11 respectively. It is linked to the detection target member.

A rear bracket 12 is mounted on the rear portion of the traveling body 1. The rear cover position sensor 9 and the tillage depth sensor 10 are mounted on both left and right outer surfaces of the rear bracket 12, respectively. In the internal space of the bracket 12, a connector 15 for connecting the above-described electric cylinder 8, a rod length sensor (not shown stroke sensor) for detecting the operating length of the lift rod 5, and the like to a control device (not shown) is accommodated. It is supposed to be.

A waterproof cover 16 covers the upper half of the rear bracket 12. The waterproof cover 16
Can be opened and closed upward using a pair of left and right bolts 17 as fulcrums, and in a state where the opening operation is performed upward, the connector 15 can be attached and detached from the opened upper opening of the rear bracket 12. When the closing operation is performed, the connector 15 is protected from water and mud so that a short circuit or the like can be prevented. In addition, 17a is a washer inserted between the bolt 17 and the waterproof cover 16 to adjust the opening / closing operation force, and 18 is a rubber attached to a contact edge of the waterproof cover 16 to buffer the contact at the time of closing. It is a band.

Reference numeral 19 denotes an arm angle sensor (potentiometer) for detecting the vertical swing angle of the lift arm 4.
The change in the angle a is input via the sensor shaft 19a, but the arm angle sensor 19 of the present embodiment is not fixed to the hydraulic case 20 side (machine side) but via the sensor shaft 19a. It is supported in a cantilever manner on the lift arm support shaft 4a. Further, reference numeral 21 denotes a stopper plate which is assembled on the hydraulic case 20 side. Since the armature 22 is interposed between the stopper plate 21 and the arm angle sensor 19, the rotation of the arm angle sensor 19 is prevented. Although the lift arm angle can be detected by being restricted, when the arm angle sensor 19 is assembled as described above, the lift arm support shaft 4
Since the alignment of the arm angle sensor 19 with respect to a becomes unnecessary, the workability at the time of assembling can be improved, and the inconvenience of damaging the arm angle sensor 19 based on an assembling error can be solved. Reference numeral 19b denotes a coupler formed integrally with the arm angle sensor 19, and the coupler 19b is connected to the control device via a cable with a coupler (not shown).

Reference numeral 23 denotes a side panel disposed on the side of the driver's seat 24. The side panel 23 has a position lever 2 for setting the height of the working unit 3 with respect to the machine.
5. Elevating switch 26 for raising and lowering working unit 3 by one-touch operation, tillage depth setting volume 27 for setting target tillage depth of automatic tillage depth control, ON-OF tilt automatic control
Automatic tilt switch 28 for F
Till depth automatic switch 29 for N-OFF, inclination setting volume 3 for setting the target inclination for automatic inclination control
0, a mode changeover switch 31 for switching the control mode in accordance with the type of the working unit 3 and the like, a raising regulation setting volume 32 for setting up raising (working unit upper limit setting) and backup (automatic ascent when reverse), A sensitivity adjustment switch 33 for adjusting the sensitivity of the automatic plowing depth control, a lift arm switch 34 for manually operating the lift arm 4
And the like. Of these operating tools, the tilt automatic switch 28 and the tillage depth automatic switch 29 are provided.
Employs a so-called touch switch.

Reference numeral 35 denotes a lever bracket disposed in a space below the side panel 23 (lever guide). The lever bracket 35 is formed in a substantially U shape in a front view. A boss 35b capable of rotatably supporting the support shaft 25a of the position lever 25 is integrally provided on the facing surface 35a. That is,
The support shaft 25a of the position lever 25 is inserted into the boss 35b from the inner surface side of the facing surface portion 35a and is prevented from being pulled out by the double nut 36. Between the facing surface portion 35a and the double nut 36, the lever operating force is adjusted. Of the disc spring 37 is sandwiched.

On the other hand, a lever angle sensor 38 for detecting the operation angle of the position lever 25 is provided on the other facing surface 35c.
(Potentiometer) can be assembled. That is, one opposing surface portion 35 of the lever bracket 35
In order to assemble the support shaft 25a of the position lever 25 to the a, and to assemble the lever angle sensor 38 to the other opposing surface 35c, it is possible to assemble these members in advance as one assembly. In addition to simplifying the operation, it is not necessary to align the support shaft 25a with the lever angle sensor 38 after assembling it to the side panel 23.

A detection lever 39 is connected to a sensor shaft (not shown) of the lever angle sensor 38. The detection lever 39 is a contact plate 25b protruding from the base end of the position lever 25. At all times from one direction. That is, the detection lever 39 that elastically contacts the contact plate 25b integrally follows the position lever 25 and inputs the lever angle to the lever angle sensor 38, but the sensor shaft is directly connected to the support shaft 25a. Since they are not connected, misalignment between the support shaft 25a and the lever angle sensor 38 can be allowed.

The lever angle sensor 38 integrally has a coupler 38a for connecting a cable.
a is attached to the lever bracket 35 in a posture facing upward. That is, the cable is pulled out from the lower portion of the lever angle sensor 38, and the coupler connecting portion can be prevented from hanging down as in the related art in which the cable with the coupler is connected to the coupler provided at the end of the cable. In addition to the inconvenience of the connecting portion interfering with the obstacle, the coupler connecting portion is located near the lower surface of the side panel 23 so that the intrusion of water and the like can be effectively prevented.

Further, reference numeral 40 denotes a connection cable with a coupler (40a) connected to the coupler 38a. Since the connection cable 40 is connected to the coupler 38a near the lower surface of the side panel 23, 23
Can be aligned along the lower surface. That is, the proper position of the connection cable 40 is locked by the clamp 41 so as to follow the lower surface of the side panel 23 and the like, so that a neat wiring without slack can be performed.

On the other hand, reference numeral 42 denotes a switching operation panel provided in a space below the driver's seat 24. The switching operation panel 42 has a dashing prevention control (automatically controls the lowering speed of the working unit 3 near the ground contact height). Dashing position setting volume 43 for setting the control height of deceleration control), and tire size setting volume 4 for setting the tire size
4. a work implement changeover switch 45 for switching the control mode of the control device according to the type of work implement and the type of work;
A setting volume 46 for controlling the raising and a function changeover switch 47 for switching various functions are incorporated. The switching operation panel 42 is normally covered with a cover 48 that can be opened and closed. The hinge 49 that supports the cover 48 so that it can be opened and closed incorporates an elastic device 50 that constantly biases the cover in the closing direction. Therefore, forgetting to close the cover 48 can be prevented.

Further, reference numeral 51 denotes an inclination sensor (overturn prevention device) provided on the traveling machine body 1;
In the above, the small-diameter cylindrical member 53 is accommodated in the large-diameter cylindrical member 52 to form a circular first chamber S1 and an annular second chamber S2, and the first chamber S1 is located on the center line of the cylindrical members 52 and 53. Accommodates the first pendulum body 54 having a fulcrum in the second chamber S
2 has a second pendulum body 55 having a fulcrum on the same center line.
Are stored on the inner peripheral surfaces of the cylindrical members 52 and 53 and the outer peripheral surfaces of the pendulums 54 and 55, respectively.
a, 53a, 54a, and 55a are stuck. That is, when the body inclination is slight, the two pendulum bodies 54,
55 does not come into contact with the electrodes 52a and 53a of the cylindrical members 52 and 53, so that the energization signals of the respective electrodes are both OFF, and when the body inclination is slightly large, the first pendulum 54
Contacts the electrode 53a of the small-diameter cylindrical member 53, while the second pendulum body 52 does not contact the electrode 52a of the large-diameter cylindrical member 52. Therefore, only the energization signal of one electrode is turned on.
When the body inclination is large, both the pendulums 54 and 55 come into contact with the electrodes 52a and 53a. Therefore, the distance between the electrodes and the like are set in advance so that the energization signals of the respective electrodes are turned ON. In the present embodiment, the inclination of the body is determined in three steps based on the energization signal, and the inclination display lamps 56a, 56b, 56 of the monitor panel 56 are determined based on the determination result.
The lighting control of c (safety tilt display lamp, caution tilt display lamp, danger tilt display lamp) is performed. still,
In the present embodiment, the electrode portions of the pendulums 54 and 55 are formed in a roller shape, and the electrode portions are rotatably mounted on the pendulum shaft. In this state, the peripheral surface can smoothly roll and follow the body inclination direction.

In the embodiment of the present invention constructed as described above, the support shaft 25a of the position lever 25 is mounted on one opposing surface 35a of the lever bracket 35, and the lever angle sensor 38 is mounted on the other opposing surface 35c. Therefore, these members can be assembled in advance as one assembly. As a result, it is not possible to simplify the assembling work.
The trouble of aligning the lever 5a with the lever angle sensor 38 can be eliminated.

Further, the lever angle sensor 38 detects the lever angle via a detection lever 39 which comes into contact with the position lever 25 (contact plate 25b) in one direction in a resilient manner. Spindle 2
Unlike the related art in which the support shaft 25a is directly connected to the shaft 5a, it is not necessary to exactly align the support shaft 25a with the lever angle sensor 38, or damage to the lever angle sensor 38 due to misalignment can be avoided.

Furthermore, the lever angle sensor 38 integrally has a coupler 38a for connecting a cable.
8a is mounted on the lever bracket 35 in a posture facing upward, so that the cable is pulled out from the lower part of the lever angle sensor 38, and a coupler with a coupler is connected to a coupler provided at the end of the cable, as in the prior art. This prevents the connecting portion from hanging, thereby preventing the coupler connecting portion from interfering with obstacles. In addition, the coupler connecting portion is located near the lower surface of the side panel 23 to effectively prevent water from entering. Can be blocked.

The connection cable 40 with a coupler connected to the coupler 38a is connected to the coupler 38a near the lower surface of the side panel 23.
The cable can be neatly arranged along the lower surface of the cable 3 without slack.

[0021]

In summary, since the present invention is constructed as described above, a lever angle detection sensor for detecting the operation angle of the operation lever is provided in the space below the lever guide covering the base end of the operation lever. In the installation, a substantially U-shaped bracket is provided in the lower space, and a support shaft of the operation lever is mounted on one of the opposing surfaces of the bracket, and a lever angle detection sensor is mounted on the other opposing surface. Therefore, it is possible to assemble these members as one assembly in advance, and as a result, it is not possible to improve workability at the time of assembling, and it is also unnecessary to perform fine adjustment after assembling the machine. Can be. In addition, since the lever angle detection sensor has the coupler integrally and is assembled with the coupler facing upward, there is no inconvenience such that the coupler connection portion becomes dangling and interferes with an obstacle. By covering the coupler connection with a lever guide, water intrusion and the like can be effectively prevented, and the cable can be routed along the lower surface of the lever guide, so that there is no slack in orderly wiring It can be performed.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a side view of a working unit.

FIG. 3 is a side view of a cable connection unit.

FIG. 4 is a plan view of the same.

FIG. 5 is a plan view showing an attached state of an arm angle sensor.

FIG. 6 is a side view of the same.

FIG. 7 is a plan view of a side panel.

FIG. 8 is a sectional view taken along line XX of FIG.

FIG. 9 is a sectional view taken along the line YY in FIG.

FIG. 10 is a sectional view of a coupler.

FIG. 11 is a front view of a switching panel.

FIG. 12 is a plan view of the same.

FIG. 13 is a front view of the monitor panel.

FIG. 14 is an internal side view of the tilt sensor.

FIG. 15 is an internal plan view of the same.

FIG. 16 is a table showing lighting conditions of a tilt display lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling body 3 Working part 23 Side panel 25 Position lever 25a Support shaft 35 Lever bracket 38 Lever angle sensor 38a Coupler 39 Detection lever 40 Connection cable

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A01B 63/00 A01B 63/114

Claims (1)

(57) [Claims] A lever angle detection sensor for detecting an operation angle of an operation lever is provided in a space below a lever guide covering a base end portion of the operation lever, and a detection signal of the lever angle detection sensor is transmitted to a cable with a coupler. In a working vehicle that is input to the control device through the control device, a substantially U-shaped bracket is provided in a space below the lever guide, and a support shaft of the operation lever is provided on one of the opposing surfaces of the bracket. On the other hand, a lever angle detection sensor provided integrally with a coupler is mounted on the other facing surface, and the lever angle detection sensor in the working vehicle is characterized in that the coupler is mounted in a posture facing upward. Mounting structure.