JP2540084Y2 - Clutch operating device for remote control type tractor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor clutch device which can be remotely controlled.

[0002]

2. Description of the Related Art Conventionally, a remote control type tractor is configured such that a clutch is turned on without pressing a clutch switch, and the clutch is turned off when a clutch switch is pressed.

[0003]

The known remote control type tractor has a risk of causing an accident due to a delay in the operation of stopping the aircraft by disengaging the clutch in an emergency.

[0004]

According to the present invention, in a remote control type tractor, a clutch switch is provided in a radio transmitter, and a radio receiver and its reception signal, a control signal of each control unit, and the like are calculated in a tractor body. An output control device is provided, and a clutch hydraulic system is provided in the clutch operation system so that the clutch hydraulic switch is pressed to operate the clutch hydraulic cylinder to turn on the clutch. This has solved the above-mentioned problem.

[0005]

When a remote control type tractor is remotely operated to perform a steering operation, a traveling speed change operation, an aircraft revolving operation, or a traveling stop operation, the clutch is turned on while the clutch switch of the wireless transmitter is pressed. When the power is transmitted and the finger is released from the clutch switch, the hydraulic cylinder is turned off. Therefore, while the clutch switch is kept pressed, the clutch is ON, but in an emergency, simply stop pressing the clutch switch, and when the operator falls down and drops the wireless transmitter, etc. When the finger is released from the clutch switch, the clutch is immediately turned off.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to a tractor shown in the drawings.
, A step 2 and a driver's seat 3. A clutch pedal 5 is disposed on one side of the front part, and a pair of left and right brake pedals 6 and 6 are disposed on the other side. The main shift lever 8 and the shuttle shift lever 9 for switching between forward and reverse are disposed on the lever panel provided at the rear of the vehicle, and a rotary cultivator 10 is mounted on the rear part so as to be able to move up and down by a top link and a lower link. The main transmission lever 8 is attached to one end of a main transmission operation shaft 8a, a boss of the shuttle transmission lever 9 is attached so as to rotate integrally with the shuttle transmission operation shaft 9a, and a plate-shaped operation suspended from the boss. A pair of left and right pins 9 deflected back and forth below the arm 9b.
e, 9e projecting, one end of a pair of front and rear shuttle transmission hydraulic cylinders 35, 35 is pivotally supported on the chassis 11 by a fulcrum shaft, and an elongated U-shaped locking member 9f is fixed to the tip of the piston rod. This is loosely fitted to the pin 9e.

A steering hydraulic distribution block 15 for controlling a steering system is provided between the left and right frames at the front of the chassis 11.
It is mounted also as a balance weight so as to face forward of the front axle case 12 and below the front grille 13. On the lower surface on the left or right side of the step 2, a hydraulic distribution block 1 for running such as clutch, brake or gear shift is provided.
6, the center of gravity of the aircraft is lowered, and the inclination angle of the aircraft can be increased to make it difficult for the aircraft to fall. Furthermore,
Since the tractor is mounted on the lower surface of step 2, it can be easily mounted on the existing tractor without special modification.

The hydraulic distribution block 15 for steering and the hydraulic distribution block 16 for traveling will be described with reference to a hydraulic circuit shown in FIG. 3. A work machine lifting / lowering pump (a) (the hydraulic circuit is not shown). And steering control pump (b)
And a travel control pump (C) are provided in parallel, and the hydraulic oil discharged from the steering control pump (B) is supplied to the steering hydraulic distribution block 15 and the steering handle 1 To the power steering circuit 17 which is manually operated by the hydraulic control.

The aforementioned steering hydraulic distribution block 15 interposed between the steering control hydraulic pump (b) and the pair of steering hydraulic cylinders 18 includes a constant flow dividing valve 19 and a relief valve 2.
0, a steering operation switching valve 21, a switching flow rate switching valve 22 to the switching valve 21, and an orifice 23. The pressure oil from the steering control pump (b) is controlled to a constant flow rate by a constant flow dividing valve 19. The operating speed of the steering hydraulic cylinder 18 is adjusted so as to be suitable for remote control, and if fine adjustment is required with respect to the operating speed, the input flow rate switching valve 22 is controlled. When the solenoid is energized, the circuit is cut off and the steering hydraulic cylinder 18 operates at a low speed with a small amount of hydraulic oil passing through the orifice 23. For example, when finely adjusting the front wheel turning angle, the steering speed decreases. The excess oil at this time is supplied to the relief valve 20
Then, the control oil flows back to the tank, and the surplus oil and the control flow of the fixed flow dividing valve 19 flow to the all-hydraulic power steering circuit 17.

The traveling hydraulic distribution block 16 includes a low-pressure relief valve 25, an unload valve 26 that energizes a solenoid during operation to block, and a right-brake switching valve 2 for intermittently supplying hydraulic oil to a right-brake hydraulic cylinder 27.
8. To the left brake switching valve 31 for interrupting the hydraulic oil to the left brake hydraulic cylinder 30, the main shift switching valve 33 for interrupting the hydraulic oil to the main shifting hydraulic cylinder 32, and to a pair of shuttle shifting hydraulic cylinders 35, 35 And a switching valve 39 for distributing the pressure oil to a quick-turn hydraulic cylinder 37 for increasing the speed of the front wheels and a clutch hydraulic cylinder 38 for operating the main clutch. Rod 32a of shift hydraulic cylinder 32
Is mounted on a support plate 32e fixed to the outside of the cylinder 32d with three reed switches 32f spaced apart in the longitudinal direction thereof and the magnet 32b. A shift sensor 66 described below is formed by opposing the movement locus of the main shift hydraulic shaft 32b, and one end of the hydraulic cylinder 32 for main shift configured in this manner is moved laterally to the arm 14 projecting from the other end of the main shift operation shaft 8a. It is connected to a laterally movable pin 14a via a long pin 14a, and the other end is connected to a bracket 14b erected on the transmission case.

A stopper 4 is provided near the fulcrum of the clutch pedal 5 and the brake pedal 6 to prevent them from returning and rotating. The clutch pedal 5 is provided with links 5a and 5b and a hydraulic pressure for the clutch. The brake pedal 6 is linked to the clutch arm 5c via a cylinder 38, and the brake pedal 6 is connected to the brake cylinder 6 via the links 6a, 6b and the right brake hydraulic cylinder 27 (or the left brake hydraulic cylinder 30) to which the connecting rod is connected. 6c, the right (or left) brake hydraulic cylinder 27 has a compression spring 27e interposed between the back surface of the piston 27a and the end surface of the cylinder 27b on the rod projecting side, and the rod 27c is retracted. When hydraulic oil is press-fitted from the oil port 27d, the step a of the rod 27c is
The rod 27c is pushed out as far as it comes into contact with the inner end face of the rod 7b. The clutch hydraulic cylinder 38
Is a compression spring 27e between the rear surface of the piston 38a and the inner end surface of the cylinder on the side where the rod 27c does not project.
, The rod 27c is pushed and urged.
When hydraulic oil is press-fitted from 7d, the rod 27c is pushed out to a position where the back surface c of the piston 38a contacts the step d of the cylinder 27b.

The pressure oil from the travel control pump (c) returns to the tank through the unload valve 26 when the machine stops, and at this time, the left and right brake hydraulic cylinders 27, 3
0 is contracted by the built-in spring and pulls the brake arm, so that both are activated and the parking brake is applied.
Of the parking brake is released, and the dual-purpose switching valve 39 is switched by energizing the solenoid a to switch the clutch hydraulic cylinder 38.
When the pressure oil is sent to the clutch, the clutch hydraulic cylinder 38 operates to contract while compressing the spring contained therein to disengage the main clutch, and then the valve 40, which has been closed by the urging force, is expanded by the pressure oil. Then, the pressure oil flows to the shuttle switching valve 36 and the main transmission switching valve 33, and the machine becomes runnable. In this state, when the energization to the solenoid a of the dual-purpose switching valve 39 is stopped, the clutch hydraulic cylinder 3
The pressurized oil in 8 is pushed out by the extension of the spring, and the orifice 41 suppresses the outflow, so that the main clutch (multi-plate clutch) is slowly connected and starts running.

During the operation, when the airframe arrives along the ridge and turns, when the turning angle of the front wheel is predetermined and the quick turn switch is turned on, the solenoid b of the dual-purpose switching valve 39 is energized and switched. Quick turn hydraulic cylinder 3
7, pressurized oil is injected, and the aircraft rapidly turns without the left and right brakes applied. When the turning angle of the front wheels returns to the set angle in the later stage of turning, the power supply is cut off and the dual-purpose switching valve 39 returns to the neutral position. The pressure oil in the turn hydraulic cylinder 37 flows out, and the front wheels return to the normal rotation speed synchronized with the rear wheels. When the running direction of the body is corrected or turned by the left and right brakes, when the power to the solenoid of one of the left and right brake switching valves 28 and 31 is cut off, the spring of the cylinder connected thereto pushes the piston to reduce the operation. Pressure oil flows into the tank and pulls the brake arm to activate one of the brakes.

The radio transmitter 42 has an engine stop switch 43 composed of a single-pole single-return (rebound) push button switch, a steering volume momentary 45 that is steered according to a turning direction and a turning angle, and a pair of left and right brake switches on the upper surface. 46 (single-pole single-return type push button switch), a single-pole double-return type throttle switch 47 capable of switching between high-neutral-low, and a single-pole double-return type lift switchable for ascent-neutral-descent An arm switch 48 and a check lamp 50 are provided. On the side surface, when turned forward, the vehicle moves forward, and when turned backward, the vehicle moves backward. A speed change switch 51 for main speed change is provided, and a clutch switch 52 for connecting and disconnecting the main clutch is provided on the lower surface. And ON state latch switch 52 is pushed by always have a single-pole, single 倒型 finger, releasing the OFF
Since it is provided in the concave portion as shown in FIG. 5, there is no need for inadvertent ON operation.
Since the finger enters the concave portion in the pressed state without becoming N, it is easy to hold that state. 53 is a transmitting antenna.

The radio receiver 55 is connected to the left fender 56.
A remote control changeover switch (switching between remote operation and manual operation) 57 in a tool box provided on the lower surface of
The received signal is input to a remote control microcomputer unit 60 provided at the front of the operation unit, and the remote control changeover switch 57, the proximity setting volume 58, and the front grille are provided. Proximity sensor 61, which is an ultrasonic sensor attached to the center of 13 in the forward direction, steering sensor 62 for detecting the turning angle of the front wheel, throttle sensor 63 for the engine, shuttle sensor 65 for detecting the shift position of the shuttle shift, The detection result of the shift sensor 66 that detects the shift position is also input, and the microcomputer unit calculates these input values and outputs the calculated values to the buzzer 67 and each of the switching valves for automatic control. Reference numeral 68 denotes a receiving antenna pivotally supported by a front-rear support shaft in the vicinity of the fender farmland behind the driver's seat 3 so as to be able to pivot sideways. Keep in space. An exclusive case is not required for the proximity sensor 61, and an obstacle can be accurately detected without being affected by grass or the like.

As shown in FIG. 16, the throttle control device is mounted on a throttle motor 70 which rotates in the forward and reverse directions according to a control signal from the microcomputer unit 60 based on the ON / OFF signal of the throttle switch 47, and which is mounted on a shaft which rotates. Cam plate 71 having an arcuate portion centered on the axis, and arcuate surfaces A and B of cam plate 71
A limit switch 72 is turned on to rotate the throttle motor 70, and turns off and stops when it exceeds the range. The limit switch 72 is connected to the eccentric position of the cam plate 71 and the upper end of the governor lever 73 by a throttle wire. When the throttle switch 47 is turned on by tilting the throttle switch 47 from one of the standing positions (OFF) to one or the other, the limit switch 72 is turned on by the cam plate 71 as shown in FIG. The throttle motor 70 rotates in the forward and reverse directions to rotate the governor lever 73 in the forward and reverse directions. The governor 73 can also be operated by an artificial operation system.

When shifting is performed manually, the shuttle shift lever 9 is switched to forward when tilted forward, and switched to reverse when tilted backward, and the main shift lever 8 is pushed to the left and right of the neutral position (lateral groove portion of the guide groove). By pulling and rotating back and forth, the speed is changed to first speed-second speed or third speed-fourth speed, respectively. Side or 3
-Set to the 4th speed side, or attach a horizontal change hydraulic cylinder to the main shift lever 8, and set the solenoid valve attached to this hydraulic cylinder to the main shift operating shaft by turning the shift switch 51. 8a left and right (1st gear -2 when working)
When the speed change switch 51 is rotated forward during remote control, first, the rear shuttle speed hydraulic cylinder 35 is extended, the shuttle speed shift lever 9 is tilted forward to switch to forward, and the rotation is performed. The main transmission hydraulic cylinder 32 expands and contracts in accordance with the moving angle and the rotation direction, whereby the arm 14 on the side opposite to the main transmission lever 8 rotates back and forth, so that the main transmission operation shaft 8a rotates. It is shifted. When the speed change switch 51 is rotated backward, the same speed change as described above is performed for the reverse. When the shuttle shift is performed manually, the shuttle shift lever 9 is tilted to switch between forward and reverse. At this time, the pins 9e, 9e rotate together with the shuttle shift lever 9, but the pins 9e move freely in the grooves of the locking members 9f, 9f. Does not hinder tilting of the vehicle.

Further, when the main clutch is manually operated,
Since the hydraulic oil is not press-fitted into the clutch hydraulic cylinder 38, the clutch hydraulic cylinder 38 is in the on state, and the clutch is disengaged by depressing the clutch pedal 5, and the clutch switch 52 is depressed during remote control. Hydraulic oil flows out from 38, the compression spring 27e pushes out the piston 27a and the clutch is ON, and when the finger is released from the clutch switch 52, the hydraulic oil is pressed into the cylinder and contracts, and automatically operates. It will be cut. Also, since the brake is in an extended state by pressurizing hydraulic oil into the right brake hydraulic cylinder 27 (or 30) at the time of manual operation, the brake arm 6c is in a non-braking state in which the brake arm 6c is pushed upward. When the brake pedal 6 is depressed, the brake arm 6c pivots forward and downward to be in a braking state, and in remote control, when correcting the traveling direction, or in order to shift to the next work step after one stroke of work is completed. When one of the brake switches 46 is pressed when rotating the body, the brake solenoid valve is switched and hydraulic oil in the cylinder flows out, and the brake hydraulic cylinder 27 contracts due to the action of the compression spring 27e.
One of the brakes is actuated to correct the traveling direction or to make the aircraft revolve.

[0019]

According to the present invention, in a remote control type tractor, a clutch switch 52 is connected to a radio transmitter 42.
Is provided in the tractor body, and a control device for calculating and outputting the wireless receiver 55 and the reception signal thereof, the control signal of each control section, and the like is provided. The clutch operation system is provided with a clutch hydraulic cylinder 38 operated by an electromagnetic valve. The clutch hydraulic cylinder 38 is operated while the clutch switch 52 is pressed to turn on the clutch, so that in the case of an emergency, the user merely releases the finger from the clutch switch 52 and stops pressing the switch. Even if no operation is performed, the clutch is immediately disengaged, and quick and accurate measures can be taken.

[Brief description of the drawings]

FIG. 1 is a plan view of a tractor.

FIG. 2 is a side view of the same.

FIG. 3 is a hydraulic circuit diagram.

FIG. 4 is a plan view of the wireless transmitter.

FIG. 5 is a sectional view of the same.

FIG. 6 is a diagram illustrating a transmission signal of a wireless transmitter.

FIG. 7 is an input / output diagram of the microcomputer unit.

FIG. 8 is a cross-sectional view of a main transmission unit.

FIG. 9 is a cross-sectional view of a rear connecting portion of the main transmission hydraulic cylinder.

FIG. 10 is a side view of a driving operation unit.

FIG. 11 is a sectional view of a main transmission hydraulic cylinder.

FIG. 12 is a plan view of the shuttle shift operation device.

FIG. 13 is a side view of the brake operating device and the clutch operating device.

FIG. 14 is a sectional view of a brake hydraulic cylinder.

FIG. 15 is a sectional view of a clutch hydraulic cylinder.

FIG. 16 is a side view of the throttle control device.

FIG. 17 is an operation diagram of a throttle switch, a limit switch, and a throttle motor.

[Explanation of symbols]

 Reference Signs List 8 Main shift lever 9 Shuttle shift lever 10 Rotary cultivator 11 Chassis 12 Front axle case 13 Front grille 14 Arm 15 Steering hydraulic distribution block 16 Traveling hydraulic distribution block 18 Steering hydraulic cylinder 27 Right brake hydraulic cylinder 32 Main transmission Hydraulic cylinder for shuttle 35 Shuttle shift hydraulic cylinder 38 Hydraulic cylinder for clutch 42 Wireless transmitter 51 Shift switch 55 Wireless receiver

Claims (1)

(57) [Scope of request for utility model registration] In a remote control type tractor, a clutch switch 52 is provided in a radio transmitter 42, and a radio receiver 55 and a control device for calculating and outputting a received signal, a control signal of each control unit, and the like are provided in a tractor body. And a clutch operating system is provided with a clutch hydraulic cylinder 38 operated by an electromagnetic valve.
A clutch operating device for a remote control type tractor, characterized in that the clutch hydraulic cylinder 38 is actuated to turn on the clutch in a state where the clutch 2 is pressed.