JP3084819B2 - Work equipment traveling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device for a working machine such as a combine.

[0002]

2. Description of the Related Art Conventionally, a combine traveling device having a pair of right and left crawlers, drive wheels for driving and rotating the crawlers, and a reverse rotation mechanism for rotating the drive wheels forward and reverse to perform a spin turn is known. A hydraulic continuously variable transmission having a mechanism for continuously changing the rotation of the input shaft and a rotation torque changing mechanism is separately known.

[0003]

When the left and right drive wheels are rotated forward and backward to perform a spin turn, the traveling device of the above-mentioned known example may run out due to insufficient rotational torque transmitted to the drive wheels. As a countermeasure against this problem, it is preferable to increase the rotational torque transmitted to the drive wheels automatically when a load is applied to the rotation of the drive wheels by starting the spin turn.

[0004]

SUMMARY OF THE INVENTION The present invention, when the load on the driving wheel performs a spin turn or the like is applied, by detecting this, so that the rotational torque transmitted to the drive wheels smoothly travel was automatically variable is It was done.

[0005]

According to the present invention, there is provided a transmission case 16 for transmitting a rotational force inputted to an input shaft 21 to axles 17, 17 to which driving wheels 18, 18 of a pair of right and left crawlers 12, 12 are fixed. In a traveling device including a hydraulic continuously variable transmission 44 having a continuously variable transmission mechanism and a rotation torque changing mechanism provided between an engine and the input shaft 21, the variation of the load of the drive wheel 18 is changed to a desired position. A load detecting unit A for detecting is provided, and the detecting unit A and the hydraulic continuously variable transmission 44 are output by operating the rotation torque changing mechanism according to the load detection of the load detecting unit A. In the traveling device for a working machine configured to vary the torque, and in the device, the load detection unit A and the hydraulic continuously variable transmission 44 are configured such that the load detection unit A has a large load. When detecting This is a traveling device of a working machine configured to increase the output torque by operating a rotation torque changing mechanism.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings by taking a combine as an example. 1 is a combine body, 2 is a traveling device provided below the body 1, 3 is a threshing device provided above the body 1, Reference numeral 4 denotes a cutting unit, 5 denotes a weed body of the cutting unit 4, 6 denotes a scraping reel, 7 denotes a cutting blade, 8 denotes an auger, and 9 denotes a grain culm cut by the cutting unit 4 to be conveyed to the threshing apparatus 3. Transport device, 1
Reference numeral 0 denotes a cutting vertical cylinder for moving the cutting unit 4 and the transport device 9 up and down. Reference numeral 12 denotes a pair of right and left crawlers of the traveling device 2. It is configured to perform a spin turn by rotating each other in reverse. Reference numeral 13 denotes a main transmission lever provided on the control unit, 14 denotes an auxiliary transmission lever, and 15 denotes a power steering lever.

In FIG. 2, 16 is a mission case,
Reference numeral 17 denotes an axle provided on the transmission case 16, reference numeral 18 denotes a drive wheel fixed to the axle 17, reference numeral 21 denotes an input shaft, reference numeral 22 denotes an intermediate shaft, and reference numeral 23 denotes an auxiliary transmission mechanism 20 provided on the input shaft 21 and the intermediate shaft 22. A group of gears, 24 is a side clutch shaft, 25 is a center gear provided at a center position of the side clutch shaft 24, 26 is a gear that constantly meshes with the center gear 25 provided on the intermediate shaft 22, 27 is the center gear Reference numeral 25 denotes a right internal tooth on the right side of the center gear 25, reference numeral 28 denotes a left internal tooth on the left side of the center gear 25, and reference numeral 29 denotes a tooth formed on the outer periphery of the right clutch body 27. The gear 29 always meshes with the right axle 17
Fixed to. Reference numeral 30 denotes a gear that constantly meshes with a tooth formed on the outer periphery of the left clutch body 28, and the gear 30 is a left axle 1
Fix to 7.

The reference numeral 31 designates the side clutch shaft 2
A gear 32 is fixed to the reverse shaft 31 and the gear 32 is always meshed with a gear 33 fixed to the intermediate shaft 22. The side clutch shaft 24
Is provided with a reversing mechanism 34 for performing a spin turn by reversing the left and right axles 17 to each other. The reverse rotation mechanism 34 is composed of a reverse rotation clutch body 35 with which the left clutch body 28 slides. The reverse rotation clutch body 35 is fixed to the side clutch shaft 24, a gear 36 is fixed to the reverse rotation clutch body 35, and the gear 36 is The gear 32 always meshes. FIG. 3 is a hydraulic circuit diagram, wherein 40 is an oil tank, 41 is an oil pump, 42 is a clutch switching valve, and 43 is a clutch cylinder for operating shifters of left and right clutch bodies 27 and 28 provided in the transmission case 16. It is.

When the power steering lever 15 is tilted from the neutral position to one of the left and right sides, one of the left and right clutch bodies 27 and 28 is disengaged, and the other crawler 12 is driven to rotate. To correct the direction, and further tilt the clutch body 28 of the reverse rotation mechanism 33.
And the reverse rotation clutch body 35 are brought into contact with each other,
2 are rotated in opposite directions to perform a spin turn.

The transmission case 16 has a hydraulic stepless transmission 44 mounted thereon. The hydraulic type continuously variable transmission 44 has a variable displacement pump 45 and a variable displacement motor 46 which constitute a mechanism for continuously changing the speed and a rotating torque changing mechanism. By changing the inclination angle between the plate 47 and the motor swash plate 48, the rotation of the engine is transmitted to the input shaft 21 by changing the rotation speed and the rotation torque. 49 is a pump swash plate inclination changing arm for changing the inclination angle of the pump swash plate 47 of the variable displacement pump 45, and 50 is the variable displacement motor 46.
Is a motor swash plate inclination changing arm for changing the inclination angle of the motor swash plate 48.

However, when the left and right drive wheels 18, 18 are rotated forward and reverse to perform a spin turn, or when climbing a steep slope, the rotational torque transmitted to the drive wheels 18, 18 is insufficient. May stall. Therefore, a load detection unit A for detecting a change in the load of the driving wheel 18 is provided at a desired position, and the detection unit A and the hydraulic continuously variable transmission 44 are connected to each other by a load that the load detection unit A has a large load. When it is detected, the rotation torque changing mechanism is operated to increase the output torque. In the present embodiment, a main relief valve 51 is provided in a hydraulic circuit of the hydraulic continuously variable transmission 44, and the main relief valve 51 is used as a load detecting unit A. The output changing cylinder 52 is connected by an oil passage 54, and the rod 53 of the output changing cylinder 52 is attached to the motor swash plate inclination changing arm 50. That is, when a load is applied to the drive wheels 18, the load returns to the hydraulic continuously variable transmission 44, and the hydraulic pressure in the hydraulic circuit of the hydraulic continuously variable transmission 44 increases. As the oil is released to lower the oil pressure and reduce the load,
A main relief valve 51 capable of detecting a hydraulic pressure in a hydraulic circuit of the hydraulic continuously variable transmission 44 is a load detection unit A,
When the main relief valve 51 releases oil, the load is large, so that the rod 53 of the output changing cylinder 52 is extended by this oil to rotate the motor swash plate inclination changing arm 50, and the variable displacement motor 46 Motor swash plate 48
The inclination angle is changed, the rotation speed is reduced, and the output torque is increased.

Reference numeral 55 denotes a manual lever for returning the motor swash plate inclination changing arm 50 rotated by the output changing cylinder 52 to its original position. The manual lever 55 is connected to the rod 53 of the output changing cylinder 52 and the motor. The swash plate inclination changing arm 50 is connected. 56 is a pilot oil passage 57
If the oil discharge amount of the variable displacement pump 45 does not become “0” when the main shift lever 13 is set to the neutral position, the minute flow rate is adjusted before reaching the variable displacement motor 46. Then, the rotation speed of the variable displacement motor 46 is set to “0”. 5
Reference numeral 8 denotes a charge pump for keeping the oil pressure in the oil passage constant. Reference numeral 61 denotes a relief valve which sets a relief pressure higher than that of the main relief valve 51 and sets the amount of expansion and contraction of the rod 53 by the position of an oil discharge port 62 of the output changing cylinder 52.

FIG. 4 shows another embodiment, in which the main shift lever 13 is connected to the pump swash plate 47 of the variable displacement pump 45 of the hydraulic continuously variable transmission 44, and the power steering lever 15 is Valve 59 and output change cylinder 5
2 is connected by an oil passage 60, and the output changing cylinder 52 is extended to rotate the motor swash plate tilt changing arm 50 in accordance with the tilting operation of the power steering lever 15. Accordingly, the rotation torque changing mechanism of the hydraulic continuously variable transmission 19 automatically operates in conjunction with the operation of the power steering lever 15, and the rotation torque transmitted to the input shaft 21 automatically increases. Insufficient rotational torque due to the load on the motor 18 can be prevented, the operation can be performed smoothly without stopping until the end of the spin turn, and the operation is not hindered.

[0014]

Next, the operation will be described. When the engine is rotated, the rotation is transmitted to the hydraulic continuously variable transmission 44, and the hydraulic continuously variable transmission 44 is continuously variable to the input shaft 21 by operating the main transmission lever 13. The rotation of the input shaft 21 is transmitted to the intermediate shaft 22 while being shifted by the gear group 23 while the speed is changed, and the rotation of the intermediate shaft 22 is meshed with the gear 26 and the center gear 25. To rotate the side clutch shaft 24.

When the center gear 25 rotates, the left and right clutch bodies 2 meshing with the left and right internal teeth of the center gear 25
The wheels 7 and 28 rotate, and the axle 17 is rotated forward via the gears 29 and 30 which are always meshed with the teeth of the left and right clutch bodies 27 to travel.

When the power steering lever 15 in the neutral position is tilted to one of the left and right sides, for example, to the left, the clutch switching valve 42 is switched, the left clutch cylinder 43 is extended, and the right clutch body 27 With the clutch engaged, the left clutch body 28 is disengaged from the left internal gear of the center gear 25, the transmission to the left gear 30 is turned off, and the drive to the left crawler 12 is stopped. Make direction correction to the left. Conversely, when the power steering lever 15 in the neutral position is tilted to the right, the drive to the right crawler 12 is stopped, and the machine body corrects the right direction by the drive rotation of the left crawler 12.

When the direction of the body 1 is changed in the field, the power clutch lever 15 is tilted further to the left than the clutch disengaged position, so that the left clutch 28 slides on the reverse clutch 35 and the reverse clutch 35 35, the rotation of the intermediate shaft 22 is transmitted via the gears 33 and 36, so that the left clutch 28 rotates in the opposite direction to the right clutch 27, and the left and right drive wheels 18 rotate in opposite directions. Perform a spin turn.

In this case, in a spin turn performed by rotating the left and right drive wheels 18 in opposite directions, or when climbing a steep hill, the rotational torque transmitted to the drive wheels 18 is insufficient to stall. Sometimes. Therefore,
A load detecting unit A for detecting a change in the load of the drive wheel 18 is provided at a desired position, and the detecting unit A and the hydraulic continuously variable transmission 44 detect a large load by the load detecting unit A. In some cases, the output torque is increased by operating the rotation torque changing mechanism. Therefore, the output torque is increased by operating the rotation torque changing mechanism of the hydraulic continuously variable transmission 44 without performing any operation, so that the operability is improved and the vehicle travels smoothly.

In this embodiment, the main relief valve 51 is provided in the hydraulic circuit of the hydraulic continuously variable transmission 44.
The main relief valve 51 is used as a load detecting unit A, and an output changing cylinder 52 is connected to the main relief valve 51 serving as the load detecting unit A by an oil passage 54. The rod 53 of the output changing cylinder 52 is Since it is mounted on the motor swash plate inclination changing arm 50, if a load is applied to the drive wheel 18 for any reason, the hydraulic continuously variable transmission 4
Since the hydraulic pressure in the hydraulic circuit of FIG. 4 rises, the main relief valve 51 detects the load and releases the oil, and the oil released from the main relief valve 51 automatically extends the rod 53 of the output changing cylinder 52. By rotating the motor swash plate inclination changing arm 50 to change the inclination angle of the motor swash plate 48 of the variable displacement motor 46 to reduce the number of revolutions and increase the output torque, the vehicle can run smoothly, and operability can be improved. Is improved.

In this case, it is dangerous if a spin turn operation is performed by mistake while the vehicle is running at a speed higher than the spin turnable speed. Automatically changes the inclination angle of the motor swash plate 48 of the variable displacement motor 46 of the hydraulic stepless transmission 44 according to the load applied to the rotation of the hydraulic system, and reduces the number of revolutions to increase the output torque. Spin turn can be performed, improving operability.

[0021]

According to the present invention, there is provided a transmission case 16 for transmitting a rotational force inputted to an input shaft 21 to axles 17, 17 to which driving wheels 18, 18 of a pair of right and left crawlers 12, 12 are fixed.
In a traveling device including a hydraulic continuously variable transmission 44 having a continuously variable transmission mechanism and a rotation torque changing mechanism provided between an engine and the input shaft 21, the variation of the load of the drive wheel 18 is changed to a desired position. A load detection unit A for detecting is provided,
A traveling device for a working machine, wherein the detection unit A and the hydraulic continuously variable transmission 44 are configured to vary the output torque by operating the rotation torque changing mechanism in response to the load detection of the load detection unit A. It is possible to run smoothly. Further, according to the present invention, in the device, the load detecting unit A and the hydraulic stepless transmission 44 are operated when the load detecting unit A detects a large load. Since it is a traveling device of a working machine configured to increase the output torque, a. When the load on the drive wheel 18 becomes large due to a spin turn performed by rotating the left and right drive wheels 18, 18 in opposite directions, or a steep slope, the load detection unit A detects the load and detects the hydraulic continuously variable transmission. Since the output torque is increased by operating the rotation torque changing mechanism of 44, a spin turn or a climb on a steep slope can be smoothly performed without any operation, and the operability is improved. B. Even if the spin turn operation is mistakenly performed while traveling at a speed higher than the speed at which the spin turn is possible, when the spin turn is started, the hydraulic continuously variable transmission 44 is automatically activated by the load applied to the left and right drive wheels 18. By operating the rotation torque changing mechanism to reduce the number of rotations and increase the output torque, the spin turn can be performed safely and smoothly, and the operability can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a sectional view of a hydraulic circuit and a transmission case of the hydraulic continuously variable transmission.

FIG. 3 is a hydraulic circuit diagram of a power steering lever.

FIG. 4 is a sectional view of a hydraulic circuit and a transmission case according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Traveling device, 3 ... Threshing device, 4 ... Harvester,
5 ... Weeding body, 6 ... Scraping reel, 7 ... Cutting blade, 8 ... Auger,
9: conveying device, 10: cutting vertical cylinder, 12: crawler, 13: main transmission lever, 14: auxiliary transmission lever, 15:
Power steering lever, 16: transmission case, 17: axle, 18: drive wheel, 20: auxiliary transmission mechanism, 21: input shaft,
Reference numeral 22: intermediate shaft, 23: gear group, 24: side clutch shaft, 25: center gear, 26: gear, 27: right clutch body, 28: left clutch body, 29, 30: gear, 31 ...
Reverse shaft, 32, 33 gear, 34 reverse mechanism, 35 reverse clutch body, 36 gear, 40 oil tank, 41 oil pump, 42 clutch switching valve, 43 clutch cylinder, 44 hydraulic Continuously variable transmission, 45: variable displacement pump, 46: variable displacement motor, 47: pump swash plate, 4
8 ... motor swash plate, 49 ... pump swash plate inclination changing arm, 5
0: motor swash plate inclination changing arm, 51: main relief valve, 52: output changing cylinder, 54: oil passage, 53
... Rod, 55 ... Manual lever, 57 ... Pilot oil passage,
56: neutral valve, 58: charge pump, 5
9 ... valve, 60 ... oil passage, 61 ... relief valve, 62
... oil drain port.

Claims (2)

(57) [Claims] A transmission case for transmitting a rotational force inputted to an input shaft to an axle to which driving wheels of the pair of crawlers are fixed, between an engine and the input shaft. Continuously variable transmission 44 having a continuously variable transmission mechanism and a rotating torque changing mechanism provided in the vehicle
And a load detecting unit A for detecting a change in the load of the drive wheel 18 at a desired position. The detecting unit A and the hydraulic continuously variable transmission 44 are connected to the load detecting unit A. A traveling device for a working machine, wherein the output torque is varied by operating the rotation torque changing mechanism in response to the load detection . 2. The system according to claim 1, wherein the load detecting unit A and the hydraulic continuously variable transmission 44 actuate the rotation torque changing mechanism when the load detecting unit A detects a large load. A traveling device for a working machine configured to increase output torque.