JP3967070B2 - Farm vehicle traveling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a farm vehicle traveling apparatus, and more particularly, to a farm vehicle traveling apparatus including a mechanical transmission capable of individually driving left and right drive shafts by inputting power from a hydraulic transmission.
[0002]
[Prior art]
In a farm vehicle such as a combine, it has two hydraulic motors that individually drive the crawler traveling devices on the left and right sides of the aircraft, and as a conventional technology that enables straight traveling and turning traveling by controlling the rotation speed of each hydraulic motor, For example, the technique described in JP-A-7-186998 is known.
[0003]
According to this prior art, a detector of a clutch control circuit interlocked with the steering handle is provided, and this detector is used when the steering handle is operated in a straight traveling where the rotational speeds of both hydraulic motors are controlled substantially the same. The steering wheel is inserted into a notch hole formed in the handle post, and the steering handle is detached from the notch hole at the time of turning operation for controlling so as to cause a difference in the rotational speeds of both hydraulic motors. On the other hand, the clutch control circuit quickly releases the clutch when the detector is displaced from the position where the detector is inserted into the notch hole, and the detector is released from the notch hole. When the position is returned from the inserted position to the inserted position, control is performed so that the clutch is engaged after a predetermined time has elapsed.
[0004]
[Problems to be solved by the invention]
However, in the prior art, as described above, since the timing of connection between the clutch and the hydraulic motor was electrically controlled, it is considered that there is an uneasy point from the viewpoint of reliability, and the manufacturing cost There was a problem such as an increase.
[0005]
The present invention has been made in order to solve such a problem. The object of the present invention is to improve the durability of the clutch connecting the motor output shafts of the left and right hydraulic transmissions and to improve the traveling output. It is another object of the present invention to provide a farm vehicle traveling apparatus that can eliminate the left and right losses and can control the clutch connection timing only by a combination of hydraulic valves.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 shifts by inputting a hydraulic transmission (40) capable of converting the power of the engine (32) into hydraulic pressure, and an output from the hydraulic transmission (40). In the traveling device of the agricultural vehicle (10), the mechanical transmission (42) for driving the left and right drive shafts (44-1, 44-2),
Two hydraulic transmissions (40) are arranged corresponding to the left and right drive shafts (44-1, 44-2), and each of these hydraulic transmissions (40-1, 40-2) has a pair of hydraulic pressures. A pump (46) and a hydraulic motor (48) are provided, the output shafts (48a) of the hydraulic motor (48) are connected to each other via a clutch means (50), and the pair of hydraulic pumps (46, 46, 46) communicate with each other through an oil passage (56) with a switching valve (54) interposed, and when turning, the clutch means (50) is switched to a disconnected state while the switching valve (54) is held in the communication position. After that, the switching valve (54) and the clutch means (50) are linked so that the switching valve (54) is switched to the shut-off position .
[0007]
The invention according to claim 2 is characterized in that the switching valve (54) is held at the communication position only during straight traveling in the forward direction of the machine body.
[0008]
The invention according to claim 3 is based on a control valve (62) that is controlled to be switched according to the straight-ahead steering and the turning steering of the airframe by the steering means (60), and the switching control of the control valve (62). a clutch actuator (66) via a one-way delay valve (64) and disconnecting said clutch means (50) comprises a, based on the switching control of said control valve (62), via a pressure setting valve (68) the ing by switching the switching valve (54) between the hydraulic pumps (46, 46) for blocking communication, characterized in that.
[0009]
[Action]
A farm vehicle traveling device to which the present invention is applied includes a hydraulic transmission (40) capable of converting the power of an engine (32) into hydraulic pressure, and an output from the hydraulic transmission (40) is input to change the speed of the vehicle. The mechanical transmission (42) for driving the drive shafts (44-1, 44-2) is provided, and the hydraulic transmission (40) corresponds to the left and right drive shafts (44-1, 44-2). Two are arranged. Each hydraulic transmission (40-1, 40-2) has a pair of hydraulic pumps (46) and a hydraulic motor (48), and the output shafts (48a) of the hydraulic motor (48) are clutches. They are connected via means (50).
[0010]
Then, when the clutch means (50) is disconnected, the clutch means (50) is disconnected if the oil passage (56) between the hydraulic pumps (46, 46) is in communication. Is performed in a state where the oil passages (56) of the left and right hydraulic pumps (46, 46) are in communication with each other, so that the motor output shafts (48a, 48a) are in the half clutch when the clutch means (50) is disconnected. And the durability of the clutch means (50) is improved.
[0011]
In addition, the code | symbol in the parenthesis mentioned above is for contrasting drawing, Comprising: This invention is not limited at all.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
1 and 2 show the appearance of a combine as an agricultural work vehicle to which the present invention is applied. The combine 10 has a traveling machine body 12 supported by left and right crawler traveling devices 11, 11. A driver's seat 14 and a grain tank 16 for temporarily storing grain are disposed behind the driver's seat 14 on the left and right sides of the traveling machine body 12. Further, a threshing unit 18 is disposed on the left and right other sides of the traveling machine body 12, and a pre-processing unit 20 is disposed in front of the traveling machine body 12 so as to be movable up and down.
[0014]
The pre-processing unit 20 includes a divider 22 that writes cereals, a narrow guide 24, a conveying device 26, a cutting blade (not shown), and the like. 28, and is supplied to the threshing unit 18, and further threshed and sorted in the threshing unit 18, and the selected grain is temporarily stored in the grain tank 16. The grain stored in the grain tank 16 is carried out of the machine by a discharge auger 30 which is provided substantially vertically from the rear part of the grain tank 16 and has a rotatable long cylinder.
[0015]
An engine room in which the engine 32 is housed is defined on the rear rear side of the driver's seat 14, and one side of the engine room is covered with an engine cover 34. As shown in FIG. 3, the power from the engine 32 drives the hydraulic transmission 40 via the input pulley 38 by the traveling belt 36, and is transmitted from the hydraulic transmission 40 to the mechanical transmission 42, and further to the drive shaft. 44, the left and right crawler travel devices 11, 11 are driven.
[0016]
In the present embodiment, two hydraulic transmissions 40 are arranged corresponding to the left and right drive shafts 44-1 and 44-2, and each of these hydraulic transmissions 40-1 and 40-2 has a pair of hydraulic pumps. And the hydraulic motor, the output shafts of the hydraulic motor are connected to each other via a clutch means, and the clutch means is disconnected while the oil passages between the hydraulic pumps are in communication with each other. .
[0017]
In FIG. 3, hydraulic transmissions 40-1 and 40-2 are configured by combining a pair of hydraulic pumps 46 and a hydraulic motor 48 connected in a closed circuit, and the input rotation from the engine 32 is transmitted to the hydraulic pump 46. The output rotation is obtained by converting the oil pressure into hydraulic pressure and operating the hydraulic motor 48. Two such hydraulic transmissions 40 are provided corresponding to the left and right drive shafts 44-1 and 44-2, and these two hydraulic transmissions 40-1 and 40-2 are a single mechanical transmission 42. It is directly fixed to the left and right sides of the.
[0018]
The pump input shaft 46a of one (left side of the drawing) hydraulic transmission 40-1 is directly connected to the input pulley 38, and the left pump input shaft 46a is connected to the other (right side of the drawing) hydraulic transmission 40-2. The pump input shaft 46a is disposed on the same axis and is integrally connected. Further, the motor output shaft 48a of the left hydraulic transmission 40-1 is disposed on the same axis as the motor output shaft 48a of the right hydraulic transmission 40-2, and is a dog clutch (clutch means) disposed in the middle thereof. 50 is connected.
[0019]
As described above, since the dog clutch 50 is provided on the first-stage rotary shaft having a small driving torque in the path from the reduction of the rotational speed of the motor output shaft 48a to the transmission to the drive shaft 44, the dog clutch 50 is compact. Can be used. The left and right hydraulic pumps 46 are connected via a switching valve 54 disposed in the middle of a hydraulic pipe (oil passage) 56 that connects the two.
[0020]
Further, the left and right motor output shafts 48a and 48a are connected to the drive shafts 44-1 and 44-2 via left and right symmetrical gear connecting mechanisms 52-1 and 52-2 disposed in the mechanical transmission 42, respectively. The left and right crawler travel devices 11, 11 are individually driven by the drive shafts 44-1, 44-2.
[0021]
Further, in the present embodiment, the hydraulic pipes (oil passages) 56 that connect the left and right hydraulic pumps 46, 46 are communicated only when traveling straight ahead in the forward direction of the machine body.
[0022]
This is because, in a farm vehicle such as the combine 10, it is generally only necessary to travel straight forward when the vehicle is traveling forward, so that the high pressure sides of the left and right hydraulic pumps 46, 46 are switched only when traveling straight forward. The valve 54 was used for communication. In this way, by allowing the oil passages to communicate only during straight traveling on the forward side of the machine body, the discharge amounts of the left and right hydraulic motors 48 and 48 can be made equal, so that loss in travel output can be eliminated. Further, since the switching valve 54 is used for switching the oil passage, the structure of the switching valve 54 can be simplified.
[0023]
Similarly, in this embodiment, when the left and right motor output shafts 48a, 48a are connected by the dog clutch 50 described above, they are connected only during straight traveling on the forward side of the machine body.
[0024]
Further, in the present embodiment, the clutch is controlled via the one-way delay valve based on the control valve that is controlled to be switched according to the straight-ahead steering and the turning steering of the airframe by the steering means. A clutch actuator for connecting and disconnecting means 50 and the switching valve 54 for disconnecting communication between the hydraulic pumps 46 and 46 via a pressure setting valve based on switching control of the control valve are provided.
[0025]
That is, in FIG. 3, the traveling device of the present embodiment includes a control valve 62 that is switched by an operation of a multi-steer lever 60 described later, and a one-way delay valve based on the switching control of the control valve 62. A clutch cylinder (clutch actuator) 66 for connecting / disconnecting the dog clutch 50 via 64 and a control valve 62 are controlled to switch between the hydraulic pumps 46, 46 via a sequence valve (pressure setting valve) 68. And the switching valve 54 for shutting off communication.
[0026]
The one-way delay valve 64 includes a throttle valve 70 and a check valve 71, and when pressure oil flows in the direction of arrow A, a pressure oil signal is transmitted through the check valve 71 without causing a time delay. However, when the pressure oil flows in the direction of arrow B, the pressure oil is squeezed through the throttle valve 70, so that the pressure oil signal is transmitted after a predetermined time. In addition, a predetermined pressure is set in advance in the sequence valve 68, and when a hydraulic pressure exceeding the set pressure is generated, the switching valve 54 in the subsequent stage is switched through the sequence valve 68.
[0027]
Here, the operation timing of the switching valve 54 and the dog clutch 50 will be described. First, the left and right motor output shafts 48a and 48a are connected by the dog clutch 50 and rotated synchronously. Therefore, when the dog clutch 50 is disconnected, the switching valve 54 does not operate until the oil pressure on the input side of the sequence valve 68 reaches a predetermined pressure, and the state where the oil passage of the pipe 56 is communicated is maintained. Yes. On the other hand, in the dog clutch 50, the clutch cylinder 66 is operated by the turning operation of the multi-steering lever 60 via the check valve 71 of the one-way delay valve 64, and is disconnected almost simultaneously with the turning operation.
[0028]
Next, from the state where the dog clutch 50 is disconnected and the left and right motor output shafts 48a and 48a are independently driven and the oil passage of the pipe 56 is disconnected by the switching valve 54, the multi steering lever 60 is returned. When the dog clutch 50 is connected by operation, since a predetermined pressure is applied in advance to the input side of the sequence valve 68, the multi-steering lever 60 is operated to the neutral position, and immediately through the sequence valve 68. The switching valve 54 is switched, and the oil path of the pipe 56 is communicated. On the other hand, the pressure oil from the clutch cylinder 66 that operates the dog clutch 50 is returned while being throttled through the throttle valve 70 of the one-way delay valve 64, so that the dog clutch 50 is connected with a delay of a predetermined time.
[0029]
Thus, when engaging and disengaging the dog clutch 50, in either case described above, by performing in a state where the communicating oil passage between the left and right hydraulic pumps 46 and 46, when disengaging the dog clutch 50 During the half clutch, the rotation of the motor output shafts 48a, 48a is aligned.
[0030]
That is, when the dog clutch 50 is disconnected and the rotations of the left and right hydraulic motors 48, 48 are not synchronized, the clutch may not be engaged when attempting to connect the dog clutch 50. Even when attempting to disconnect the dog clutch 50 when the rotation of the 48 is synchronized, if there is a difference in the rotation of the hydraulic motors 48, 48, a large surface pressure is generated at the clutch sliding portion and it is difficult to disconnect. There is a fear. However, according to the present embodiment, the operability of the dog clutch 50 is improved as described above, and the durability of the clutch is improved.
[0031]
FIG. 4 shows an arrangement state of various operation levers arranged in the driver's seat 14.
[0032]
That is, the driver's seat 14 is provided with a main transmission lever 58 and a multi-steering lever 60 along with other instruments, and the main transmission lever 58 is capable of switching forward and backward (F, N, R) and continuously variable. 5 is a lever that can be operated from the start of shifting to the maximum speed. As shown in FIGS. 5A and 5B, the multi-steer lever 60 is a lever that performs a side clutch operation and an elevating operation of the preprocessing unit 20. It is.
[0033]
The multi-steer lever 60 is tilted in the left-right direction from the neutral position, whereby the left and right side clutch operations are performed, and the operation angle is detected by the rotary switch 61a. Further, the multi-steer lever 60 is tilted in the front-rear direction from the neutral position, whereby the elevating operation of the preprocessing unit 20 is performed, and the operation angle is detected by the rotary switch 61b. The rotational direction and speed of the motor output shaft 48a are determined by moving the pump swash plate (both not shown) by the trunnion shaft of the hydraulic transmission 40 by operating the main transmission lever 58, and changing the discharge amount of hydraulic oil. The rotation of the output shaft is controlled.
[0034]
Next, the operation will be described.
[0035]
If the multi-steer lever 60 is set to the neutral position and the main speed change lever 58 is operated to the forward position during the traveling of the body, the body is in a straight traveling state. In this case, a rotary switch 61a for detecting the operating angle of the lever is provided below the multi-steering lever 60, and a neutral position detection signal from the rotary switch 61a causes a solenoid 62a of the control valve 62 to The control valve 62 is not switched without being energized. At this time, the oil passage of the control valve 62 is in communication with the oil tank 72. For this reason, when the multi-steering lever 60 is operated to the neutral position, the clutch cylinder 66 does not operate, and the left and right motor output shafts 48a and 48a maintain the synchronously rotated state while the dog clutch 50 remains connected. is doing. Further, the sequence valve 68 does not operate because the pressure on the input side thereof is smaller than the set pressure, and therefore the switching valve 54 is not switched, and the left and right pump discharge amounts are maintained while the oil passage of the hydraulic pipe 56 is kept in communication. It is almost the same.
[0036]
Thus, when the multi-steering lever 60 is in the neutral position, the substantially right and left pump discharge amounts are converted into output rotations of the left and right hydraulic motors 48 and 48, and the left and right drive shafts 44-1 and 44-2. Are rotated synchronously and the left and right crawler travel devices 11 are driven at substantially the same speed.
[0037]
Next, when the multi-steering lever 60 is tilted to the left or right from the neutral position and the main transmission lever 58 is operated to the forward movement position, the aircraft enters a turning traveling state. In this case, the solenoid 62a of the control valve 62 is energized based on the signal from the rotary switch 61a, and the control valve 62 is switched. As a result, the dog clutch 50 is disconnected through the one-way delay valve 64 and the clutch cylinder 66, and the switching valve 54 is switched through the sequence valve 68 to shut off the oil passage of the hydraulic pipe 56.
[0038]
Thus, the left and right pump discharge amounts are individually controlled, and the left and right hydraulic motors 48 and 48 are rotated by the different pump discharge amounts. For this reason, the left and right drive shafts 44-1 and 44-2 are individually rotated, and the left and right crawler traveling devices 11 and 11 are individually driven.
[0039]
【The invention's effect】
As described above, according to the first aspect of the invention, when the clutch means is disengaged, the oil passage between the left and right hydraulic pumps is communicated, so that the half clutch when the clutch means is disengaged. Sometimes, the rotation of each motor output shaft is aligned, so that the durability of the clutch means can be improved.
[0040]
According to the second aspect of the present invention, the oil passages arranged between the hydraulic pumps of the hydraulic transmissions are communicated only during straight traveling in the forward direction of the machine body, so that the discharge amounts of the left and right hydraulic motors can be made equal. Therefore, it is possible to eliminate the left and right loss of the traveling output. In addition, for example, when a switching valve is used for switching the oil passage, the structure can be simplified.
[0041]
According to the third aspect of the present invention, based on the switching control of the control valve, the clutch actuator for connecting / disconnecting the clutch means via the one-way delay valve, and the switching valve for disconnecting communication between the hydraulic pumps via the pressure setting valve Since the timing of connection between the hydraulic pumps of the left and right hydraulic transmissions and the connection of the clutch means can be controlled only by a combination of hydraulic valves, the reliability is high and the cost is low. Can be realized.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a combine to which the present invention is applied, as viewed from the front right side.
FIG. 2 is an external perspective view of the above combine as viewed from the front left side.
FIG. 3 is a diagram schematically showing the configuration of a combine traveling device.
FIG. 4 is a diagram showing a lever arrangement relationship of a driver's seat of a combine.
5A is a side view of a multi-steering lever, and FIG. 5B is a front view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Combine 11 Crawler traveling apparatus 12 Traveling machine body 32 Engine 40 Hydraulic transmission 42 Mechanical transmission 44 Drive shaft 46 Hydraulic pump 46a Input shaft 48 Hydraulic motor 48a Output shaft 58 Main transmission lever 60 Multi steering lever 61a Rotary switch (for side clutch)
62 Control valve 62a Solenoid 64 One-way delay valve 66 Clutch cylinder 68 Sequence valve 70 Throttle valve 71 Check valve

Claims (3)

In a farm vehicle traveling device comprising: a hydraulic transmission capable of converting engine power into hydraulic pressure; and a mechanical transmission that inputs and outputs an output from the hydraulic transmission to drive the left and right drive shafts;
Two hydraulic transmissions are arranged corresponding to the left and right drive shafts. Each of these hydraulic transmissions has a pair of hydraulic pumps and hydraulic motors, and the output shafts of the hydraulic motors are connected to each other via clutch means. Connected,
Further, the pair of hydraulic pumps are communicated with each other through an oil passage through which a switching valve is interposed, and when turning, the clutch means is switched to disengagement while the switching valve is held at the communication position, and then the switching valve is The switching valve and the clutch means are linked so as to switch to the cutoff position.
A farm vehicle traveling device characterized by the above. The switching valve, to retain only the communication position to the straight running of the vehicle body forward,
The agricultural vehicle traveling device according to claim 1. A control valve that is switch-controlled according to the straight steering and turning steering of the aircraft by the steering means,
Based on the switching control of the control valve, and a clutch actuator and disconnecting said clutch means via a one-way delay valve,
Based on the switching control of said control valve, ing by switching the switching valve for blocking communication between the respective hydraulic pump via a pressure setting valve,
The agricultural vehicle traveling device according to claim 1.

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