JPH06343332A - Mobile working machine - Google Patents

Abstract

PURPOSE:To ensure the straight running of a working machine and perform good running control independent of the field conditions, etc., while enabling the spin and turn, etc., of the machine by interlocking the right and left driving apparatuses with separate speed change gears and equalizing the rotational speed of the right and left driving apparatuses. CONSTITUTION:The machine is provided with a mobile friction plate 41 coupling to the 1st output shaft 10 by spline coupling, a stationary friction plate 42 fixed to the 2nd output shaft 20, a connection mechanism 4 having an operation piston 43 for pressing operation and an operation mechanism 5 sending a coupling instruction when the angles of the speed change levers 51 and 52 of the right and left speed change gears 1,2 coincide with each other and sending an uncoupling instruction when the angles are deviated from each other. The straight running state and the switching to the turning motion can easily be selected interlocked with the operation of the right and left speed change levers 51,52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile work machine such as a combine, which has traveling devices on the left and right sides of a machine body and each traveling device is interlocked with an independent transmission.

[0002]

2. Description of the Related Art Conventionally, in this type of mobile work machine, the left and right traveling devices are called hydraulic pressures called hydrostatic transmission (hereinafter referred to as HST) having an engine-driven hydraulic pump and a hydraulic motor connected to the hydraulic pump. It is interlocked individually with a variable speed transmission, etc.,
Gear shift levers for left and right transmissions, that is, generally HST
By adjusting the swash plate angle adjustment lever provided in the hydraulic pump of the above, the swash plate angle is aligned left and right to match the left and right output rotation speeds to move straight at any speed, and by changing the left and right swash plate angles. Spinning is made possible by turning at an arbitrary radius of rotation and by reversing left and right swash plate angles in opposite directions to reverse left and right rotation.

[0003]

However, in the above, while the driving force is transmitted to the left and right traveling devices even when turning, the wetland traveling property is good and spin-turning is possible, but on the other hand, when traveling straight ahead. , Even if the left and right shift lever angles, that is, the left and right swash plate angles are matched, the left and right axle loads are usually different depending on the field conditions and the grain capacity in the grain tank provided in the combine. The actual rotational speeds of the left and right axles do not match, which makes it difficult to maintain straightness.

The main object of the present invention is to improve straight-ahead driving performance while keeping the advantage that spin turns etc. are possible by linking the left and right traveling devices with independent left and right transmissions.
An object of the present invention is to provide a mobile work machine that can easily maintain its straightness regardless of the field conditions.

[0005]

In order to achieve the above-mentioned main object, the invention according to claim 1 is provided with traveling devices 81 and 82 on the left and right of the machine body 9, and the traveling device 81 on the right side is the first transmission. The first output shaft 10 extending from the first output shaft 10 and the left traveling device 82 interlocking with the second output shaft 20 extending from the second transmission 2 are linked with the first output shaft 10 extending from the first output shaft 10 and the second output shaft 20. A connecting mechanism 4 for connecting and
The operating mechanism 5 for operating the connection and disconnection of the output shafts 10 and 20 by the connecting mechanism 4 is provided.

At this time, in order to eliminate the need to separately provide an operating lever and improve the operability, the invention according to claim 2 is the one according to claim 1, in which the operating mechanism 5 is the first First shift lever 51 provided in the transmission 1
And a second gearshift lever 52 provided in the second gearbox 2 and a coupling command to the coupling mechanism 4 when the displacement amounts of the first and second gearshift levers 51 and 52 are equal, and coupling is performed when the displacement amounts are different. And a controller 53 which gives a cancellation command of the above.

[0007]

According to the first aspect of the present invention, by operating the operation mechanism 5, the first output shaft 10 and the second output shaft 20 are connected to each other so that the left and right traveling devices 81, 82 can be rotated at the same speed. It is possible to ensure straightness. On the other hand, when the output shafts 10 and 20 are disconnected from each other by the operation of the operation mechanism 5, the output shafts 10 and 20 are controlled by the transmissions 1 and 2 to perform a turning operation at an arbitrary radius of rotation and a turning operation. , Spin rotation by reversing the rotation speed is possible.

According to the second aspect of the present invention, by making the displacement amounts of the two speed change levers 51, 52 coincide with each other, the output shafts 10, 20 are connected to each other and straightness can be ensured. The output shafts 10 and 20 are disconnected from each other by changing the displacement amount of. Thus, it is not necessary to separately provide an operation lever or the like, and the shift levers 51, 5
By interlocking with the operation of 2, it is possible to easily distinguish between ensuring straightness and shifting to a turning motion, thereby improving operability.

[0009]

FIG. 2 shows a combine as an example of a mobile work machine, and a crawler type traveling device 8 is provided on the lower left and right sides of a machine body 9.
1, 82 (only the right side 81 is shown), and a threshing section 6 having a mowing section 7 at the front of the machine body 9, a handling chamber 61 for accommodating a handling barrel, and a grain tank 62 for storing threshed grains at the upper part. Is provided.

As shown in FIG. 1, the drive wheel 81a provided on the right traveling device 81 is connected to the first hydraulic pump 11
And a plurality of sprockets 14, 15, 16, 1 on the first output shaft 10 of the first transmission 1 including the HST that has the first hydraulic motor 12 and that adjusts the angle of the first swash plate 13.
It is interlocked via 7,18. Similarly, the drive wheel 82a provided on the left traveling device 82 is connected to the second hydraulic pump 2
A plurality of sprockets 24, 25, 26, on the second output shaft 20 of the second transmission 2 including the HST having the first and second hydraulic motors 22 and adjusting the angle of the second swash plate 23.
They are interlocked via 27 and 28. The hydraulic pumps 11 and 21 are connected to the engine 3 via the input shaft 31 and the input pulley 32.

With the above construction, a movable friction plate 41 spline-coupled to the first output shaft 10 and a fixed friction fixed to the second output shaft 20 at the abutting portion of the first output shaft 10 and the second output shaft 20. A connecting mechanism 4 that includes a plate 42 and an operating piston 43 and connects the output shafts 10 and 20 to each other is provided. The operation piston 43 has a sprocket 4 on the input shaft 31.
A hydraulic pump 46 connected via 4, 45 and a hydraulic circuit having a relief valve 47 and an electromagnetic switching valve 48 are connected to each other, and the movable friction plate 41 is fixed to the fixed friction plate 42 at the position of the electromagnetic switching valve 48 shown in the figure. The output shafts 10 and 20 are connected by pressing.

Further, there is provided a contact 50a for opening and closing an exciting circuit 50 of a solenoid 49 provided in the electromagnetic switching valve 48, and an operation for switching the electromagnetic switching valve 48 to operate connection and disconnection of the output shafts 10 and 20. The mechanism 5 is provided.

In this case, the operating mechanism 5 may be composed of a dedicated lever or switch for opening and closing the contact 50a,
In this structure, a first gear shift lever 51 for operating the first swash plate 13 and a second gear shift lever 52 for operating the second swash plate 23 are used, and these gear shift levers 51, 52 are provided.
When the potentials of potentiometers 51a and 52a provided to these are equal, a control relay 55 is provided via a comparator 54.
Is turned on and a contact command is given by closing the contact 50a, while the control relay 55 is turned off when there is a potential difference between the potentiometers 51a and 52a, and a contact release command is given by opening the contact 50a. It consists of and.

In this way, the output shafts 10 and 20 are connected to each other by making the displacement amounts of the speed change levers 51 and 52 equal to each other, so that the straightness can be secured. On the other hand, each shift lever 51, 5
By changing the displacement amount of 2, the output shafts 10 and 20 are uncoupled, and the output shafts 10 and 20 are swung at an arbitrary radius of rotation, and the levers 51 and 52 are reversed from the neutral position in the forward and reverse directions to change the rotational speed. You can flip the left and right and make a spin turn.

[0015]

As described above, according to the first aspect of the present invention, the left and right traveling devices 81 and 82 are interlocked with the separate transmissions 1 and 2 to enable spin turns and the like, while the first output shaft 1 is provided.
By connecting 0 and the second output shaft 20, the traveling speeds of the left and right traveling devices 81 and 82 can be made uniform and straightness can be ensured.
Good traveling control can be performed regardless of field conditions.

According to the second aspect of the present invention, it is not necessary to separately provide an operating lever or the like, and the interlocking operation of the first and second shift levers 51 and 52 ensures the straightness and the turning operation. Can be easily separated from the transition, and operability can be improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a mobile work machine according to the present invention.

FIG. 2 is a perspective view showing the overall structure of the mobile work machine.

[Explanation of symbols]

1; first transmission device, 10; first output shaft, 2; second transmission device, 20; second output shaft, 4; coupling mechanism, 5; operating mechanism,
51; first shift lever, 52; second shift lever, 53;
Controller, 81, 82; Traveling device, 9; Airframe

Claims (2)

[Claims] 1. Traveling devices (81, 8) to the left and right of the airframe (9).
2), the right traveling device (81) is linked to the first output shaft (10) extending from the first transmission (1), and the left traveling device (82) is extended from the second transmission (2). In a mobile work machine interlocking with an extending second output shaft (20), a connecting mechanism (4) for connecting the first output shaft (10) and the second output shaft (20), and the connecting mechanism (4). 2. A mobile work machine comprising: an operating mechanism (5) for operating connection and disconnection of the output shafts (10) and (20) by the above. 2. An operating mechanism (5), a first transmission lever (51) provided in the first transmission (1), and a second transmission (2).
The second shift lever (52) provided to the second shift lever (52) and the first and second shift levers (51) (52) are connected with each other when a displacement command is given to the coupling mechanism (4), and when there is a difference in displacement amount, the coupling is coupled. 2. The mobile work machine according to claim 1, further comprising a controller (53) for giving a cancellation command.