JPS5924580Y2 - Transmission device for mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a mobile agricultural machine such as a combine harvester or a tractor, in which a hydraulic clutch type multi-stage transmission mechanism is incorporated into a traveling transmission, and a plurality of shift push button switches are provided to control the transmission mechanism. The present invention relates to an improvement of a device that performs traveling speed change by operating a push button switch.

Conventionally, there was a technology (for example, Japanese Patent Publication No. 42-15244) that changed the traveling speed using a pushbutton switch, but when the engine start switch was in the operating position, the pushbutton switch was turned on regardless of whether the engine was stopped or not. Since the engine is held in the operating position, there are problems such as sudden start at the same time as the engine starts, which is extremely dangerous.

On the other hand, there is a technology that returns the running output of a hydraulic motor to neutral in conjunction with the braking operation of the brake pedal (for example,
However, in mobile agricultural machinery, the engine often stops due to overload in the agricultural work section.
In addition, the running speed during agricultural work is extremely slow (at or below the running speed) compared to other vehicles, so even if the engine stops due to overload during farming, the agricultural machine will stop quickly due to this running resistance, and the brakes will stop. Since there is almost no need for braking with the pedal, the push button switch can be reset using the brake pedal as in the conventional technology.
・With a structure that requires the brake pedal to be depressed, it is difficult to solve the problem of forgetting to press the brake pedal and causing the vehicle to start suddenly by restarting the engine.

Furthermore, with mobile agricultural machinery, when checking the condition of the agricultural work section during work, specifically checking the conveyance condition of the cut husk in the combine, the handling depth and cutting height, etc.
Furthermore, when checking the planting status of the planting claws, planting rows, and missing plants in the rice transplanter, the operator in the driver's seat may temporarily stop the rice transplanter from moving.

Moreover, when a combine harvester is working to collect paddy bags, or a rice transplanter is working to pass on seedlings, the vehicle must be temporarily stopped each time, and when such a temporary stop is made, the gear can be shifted to neutral by depressing the brake pedal. By returning to work, it is necessary to change gears every time work is resumed.
For mobile agricultural machinery whose traveling speed is constant during work, it is more troublesome than conventional gear shifting operations, and the traveling speed is changed before and after stopping by operating the brake pedal, making it possible to correlate the traveling speed and the driving speed of the agricultural work part. The mobile agricultural machinery used in this system had a problem that had a significant negative impact on agricultural work performance.

The present invention addresses the above-mentioned conventional problems, and includes a holding element for maintaining the pushbutton switch in the operating position when operated, and the holding element is connected to an engine start switch, and the engine start switch is connected to the holding element. This system is equipped with a speed change reset member that cancels the switch maintenance operation by the holding element in conjunction with the engine starting operation by It is possible to reset the travel gear shift to neutral using a push button switch, and compared to a conventional structure equipped with a push button switch, it is possible to prevent unexpected sudden starts and start the engine safely. Compared to conventional technology that links
It is possible to eliminate the problem of the traveling gear being reset even if the farm is stopped temporarily during agricultural work, and the traveling gear can be maintained at a constant position while the engine is operating, and the traveling gear can be maintained at a constant position according to the working speed of the agricultural work section. It is an object of the present invention to provide a transmission for a mobile agricultural machine that can repeatedly run and stop at a running speed and that can be handled safely without deteriorating work performance compared to conventional ones.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic side view of the combine harvester, and FIG. 2 is a plan view of the same. In the figure, 1 is a truck frame equipped with a transmission 2 at the center of the front end, and 3 is a drive sprocket 4 on both sides of the truck frame 1. Running rollers are installed via track rollers 5..., 6 is a machine support supported by the track frame 1 via a rotation fulcrum shaft 7 and an elevating cylinder 8, and 9 is a frame on which a feed chain 10 is stretched on the left side. 12 is a reaping section provided with a cutting blade 13 and a culm conveying mechanism 14; 15 is a straw cutting section provided at the rear of the threshing section 9; 16 is a fried grain section; A paddy tank stores grains taken out from the threshing section 9 via a cylinder 17, 18 is an engine that drives various parts such as the running roller 3, 19 is a driver's cab, 20 is a driver's seat, 21 is a side clutch lever 22,
22 and an engine start switch 23, etc., and 24 is a power shift I provided inside the driver's cab 19.
・It is a speed change operation unit and is configured to continuously reap and thresh grain culms.

As shown in Fig. 3, hydraulic clutches 25, 26, 27, 28 for reverse and 1st to 3rd speeds and each clutch 25 to 28
A multi-stage transmission (power shift) mechanism 33 including hydraulic cylinders 29, 30, 31, and 32 that engages and engages the transmission is incorporated into the mission 2.

Hydraulic electromagnetic switching valves 34 and 35 are provided to control the operation of the cylinders 29.32 and 30.31, and each switching valve 34.3
5 reverse and 1-3 speed solenoid 36.37.3
8.39 operation introduces the pressure oil of the hydraulic pump 40 into any one of the cylinders 29 to 32 through the switching valves 34 and 35, so as to obtain a traveling shift output of either reverse or 1st to 3rd speed. It is formed into.

The cell starter 41 that starts the engine 18 is electrically connected to the battery 43 via a relay switch 42a, and the relay coil 42b of the relay 42 that turns on the relay switch 42a is connected to the engine starting switch 23. Connect to Star I/contact 23 a, and
Push button switch for reverse and 1st to 3rd speeds 44.45.
46, 47, and a push button switch 48 for returning to neutral are arranged in parallel to the power shift operation section 24.

Further, a hold coil 49 is a holding element that maintains the pushbutton switches 44 to 47 in the operating position when they are operated.
．． 50, 51, 52, a self-holding switch 53, 54, 55, 56 that self-holds the coils 49 to 52 and resets the subsequent switches 45 to 47, and a previous switch 4.
The release switches 57, 58, 59 that reset the 4-46, the output switches 60, 61, 62° 63 that energize the reverse and 1-3 speed solenoids 36-39, and the pushbutton switches 44-47 are all reset. A neutral switch 64 is provided.

The neutral switch 64 is connected to the ignition contact 23b of the starting switch 23 via a relay switch 65a, and the relay coil 65b of the loop 65, which is a shift reset member that turns off the relay switch 65a, is connected to the starting switch 23. 23 Star I/Contact 2
3 Connect to H.

Further, the switch 64 is replaced with a switch 53, and the switch 53 is replaced with a switch 53.
A switch 54 is connected to the normally closed terminal of the switch 54, a switch 55 is connected to the normally closed terminal of the switch 54, a switch 56 is connected to the normally closed terminal of the switch 55, and a switch 58 is connected to the normally closed terminal of the switch 57, and a switch 58 is connected to the normally closed terminal of the switch 57. A switch 59 is connected to the normally closed terminal, and the normally closed terminal of the switch 59 is connected to the ground.

One end of the hold coil 49 is connected to the normally open terminal of the switch 53, and the other end of the hold coil 49 is connected to the switch 57.
The other end of the hold coil 50, which has one end connected to the normally open terminal of the switch 56, is connected to the switch 58, and the other end of the hold coil 51, which has one end connected to the normally open terminal of the switch 55, is connected to the normally open terminal of the switch 56. One end of the hold coil 52 is connected to the terminal, and the other end of the hold coil 52 is connected to the ground.

Each of the output switches 60-63 is connected in parallel to the ignition contact 23b of the starting switch 23, and the normally open terminal of each switch 60-63 is connected to each solenoid 36-39.
At the same time, a reverse warning buzzer 66 is connected in parallel to the reverse solenoid 36.

The present invention is constructed as described above, and the starting switch 2
3 to activate the relay 42, rotate the cell starter 41, and start the engine 18.

And push button switch 44 for reverse and 1st to 3rd speeds
47 is operated to change the traveling speed and steer the combine harvester. When any of the switches 44 to 47 is operated, it is maintained in the operating position by the electromagnetic force of the hold coils 49 to 52, and this state is When the engine 18 is stopped due to overload, etc., when the start switch 23 is operated and the start contact 23a is connected to the battery 43, the relay 65 is activated, interrupting the application of power to the hold coils 49 to 52, and starting the operation. The pushbutton switches 44 to 47, which had been maintained in their positions, are returned to their original positions and the traveling gear is set to neutral, and the relay 42 is activated simultaneously with the relay 65 to rotate the cell starter 41 and restart the engine 18.

In this way, when the engine 18 is stopped during operation, power is applied to the hold coils 49 to 52 via the ignition terminals, and the pushbutton switches 44 to 47 are maintained in the operating position, the start switch 23 is operated. When the cell starter 41 is rotated, the relay 65 is activated to return the pushbutton switches 44 to 47 to the neutral position.

As is clear from the embodiments described above, the present invention provides a device that includes a plurality of shift pushbutton switches 44 to 47 and that shifts gears by operating the pushbutton switches 44 to 47. Holding elements such as hold coils 49 to 52 are provided to maintain this in the operating position, and the holding elements 49 to 52 are connected to the engine start switch 23 and held in conjunction with the engine 18 starting operation by the engine start switch 23. A speed change reset member such as a relay 65 is provided to cancel the maintaining operation of the switches 44 to 47 by the elements 49 to 52, and even if the engine 18 is stopped due to an overload in the agricultural work section, it will be interlocked with this when restarting the engine 18. The driving speed change by the pushbutton switches 44 to 47 can be reset to neutral by using the pushbutton switches 44 to 47, and it is possible to prevent an unexpected sudden start and start the engine 18 safely compared to the conventional structure in which the pushbutton switches 44 to 47 are provided. In addition, compared to the conventional technology in which the resetting operation of the traveling gear is linked to the brake pedal operation, it is possible to eliminate the problem of resetting the traveling gear even if the farm is temporarily stopped in the middle of agricultural work, and the engine 18 is operated. The speed change can be held at a constant position while the machine is in use, and the machine can repeatedly run and stop at a constant speed that corresponds to the working speed of the agricultural work section, making it safer to handle without reducing work performance compared to conventional machines. This has practical effects such as the ability to

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic side view of a combine harvester, FIG. 2 is a plan view thereof, and FIG. 3 is an operational system diagram of the main parts. 18... Engine, 23... Engine start switch, 44-47... Push button switch, 49-52... Holding element (hold coil).

Claims (1)

[Scope of utility model registration request] In a device that includes a plurality of shift pushbutton switches 44 to 47 and that shifts gears by operating the pushbutton switches 44 to 47, holding elements 49 to 52 maintain the pushbutton switches 44 to 47 in operating positions when the pushbutton switches 44 to 47 are operated. is provided, and the holding element 49 is attached to the engine start switch 23.
-52 are connected, and the holding elements 49-5 are connected in conjunction with the engine 18 starting operation by the engine start switch 23.
2. A transmission device for a mobile agricultural machine, characterized in that a member 65 is disposed in a transmission reset device 1 for canceling the maintaining operation of the switches 44 to 47 by the switch 2.