JP2002145107A - Transmission mechanism for traveling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve traveling stability and operability. SOLUTION: In a traveling system comprising a main hydraulic transmission 2 for traveling, left and right side clutches 15, 15', a differential mechanism 22, and a hydraulic transmission 29 for turning, and transmitting differential rotation power from the differential mechanism 22 to either of the left side clutch 15 or the right side clutch 15', that is off, when turning, the transmission mechanism is so constituted that the output capacity of the hydraulic transmission 29 for turning is larger than that of the main hydraulic transmission 2 for traveling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission mechanism for a traveling device.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 7-96855 discloses a power transmission mechanism for transmitting rotation from a power source to left and right axles via a hydraulic main transmission for traveling and left and right side clutches. A differential mechanism that is operated by a hydraulic main transmission and a separately provided turning hydraulic transmission to rotate the left and right differential output shafts differentially from the reverse direction to the same direction is provided. It describes an apparatus configured to transmit rotation to one of the left and right side clutches that is disengaged and to turn.

[0003]

In the above-mentioned prior art, the output characteristic is not taken into account because of the configuration in which the hydraulic main transmission for traveling and the hydraulic transmission for turning are simply provided. There is a problem that turning cannot be performed and workability is low. The present invention devises a transmission mechanism to stabilize traveling,
This improves workability.

[0004]

The object of the present invention is to improve running stability and workability.

[0005]

SUMMARY OF THE INVENTION The present invention provides a hydraulic main transmission 2 for traveling, left and right side clutches 15, 15 ',
A differential mechanism 22 and a turning hydraulic transmission 29,
At the time of turning, in a traveling device configured to transmit the differential rotational power from the differential mechanism 22 to one of the disengaged sides of the left and right side clutches 15 and 15 ′,
The turning hydraulic transmission 29 is a transmission mechanism of a traveling device having an output capacity larger than that of the traveling hydraulic main transmission 2. In the present invention, the traveling hydraulic main transmission 2 and the turning hydraulic transmission 29 are transmission mechanisms for traveling devices arranged in front and rear. According to the present invention, the turning hydraulic transmission 29 transmits the rotation to the side where the left and right side clutches 15 and 15 'are disengaged according to the inclination of the field, and corrects the deviation of the steering direction due to the inclination of the field. This is a transmission mechanism of a traveling device configured to control traveling.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Is a transmission case of a traveling device of a working machine such as a combine, and a traveling hydraulic main transmission (hydrostatic transmission) 2 for shifting a traveling speed to an upper position.
Is provided. Reference numeral 3 denotes an input pulley for inputting rotation from the engine to the traveling hydraulic main transmission 2, and reference numeral 4 denotes an output shaft of the traveling hydraulic main transmission 2, which is an input shaft of the transmission case 1. A sub-transmission shaft 5 is provided with a group of gears 6 so as to rotate integrally with the sub-transmission shaft 5, and the gear group 6 is selectively meshed with a gear 8 of a counter shaft 7. Reference numeral 10 denotes a center shaft having a center gear 11, and reference numeral 12 denotes a passive gear fixed to the side clutch shaft 13, which is always meshed with the center gear 11. Disks are fixed to the left and right sides of the side clutch shaft 13 in the body traveling direction, and the disks are rotatably provided on the side clutch shaft 13.
The left and right side clutches 15 and 15 'are formed by being freely and detachably brought into contact with the disks in the insides 4 and 14'. The configuration of the left and right side clutches 15 and 15 'is arbitrary, and is not limited to the embodiment. Drums 14 and 14 'are provided with side clutch gears 16 and 16' so as to rotate integrally, and the side clutch gears 16 and 16 'are always meshed with intermediate gears 18 and 18' provided on left and right output shafts 17 and 17 '. The left and right gears 19 and 19 'separately provided on the left and right output shafts 17 and 17' mesh with the axle gears 21 and 21 'provided on the axles 20 and 20', respectively, to transmit the rotation to the axles 20 and 20 '.

A differential mechanism 22 is provided in the vicinity of the side clutch shaft 13, and the differential mechanism 22 outputs the left and right differential output shafts 23 and 23 'while changing their rotational speed.
The differential mechanism 22 includes a case 24 rotatably provided in the transmission case 1, and the differential output shaft 2
3 'and 23', respectively.
Left and right bevel gears 25 and 25 'are provided at the end of 3' so as to face each other, and intermediate bevel gears rotatably mounted on shafts 26 and 26 'fixed to case 24 respectively on left and right bevel gears 25 and 25'. 27, 27 'are engaged with each other, and a case rotating passive gear 28 is provided on the outer periphery of the case 24. The case rotating passive gear 28 is provided separately from the traveling hydraulic main transmission (hydrostatic transmission) 2. A turning hydraulic transmission (hydrostatic transmission) 29 for changing the turning radius is connected. Reference numeral 30 denotes a case rotating gear that always meshes with the case rotating passive gear 28, 31 denotes a turning intermediate shaft provided with the case rotating gear 30, 32 denotes a turning intermediate gear provided on the turning intermediate shaft 31, and 33 denotes a turning intermediate gear. A turning output gear (turning input shaft) 3 of the turning hydraulic transmission 29;
4 is provided. Reference numeral 35 denotes a turning input pulley for inputting rotation from the engine to the turning hydraulic transmission 29. 36
Is a parking brake. FIGS. 3 and 4 show the arrangement of each axis for easy understanding, and do not show the axis itself.

[0008] Left and right differential output gears 40, 40 'are provided on the differential output shafts 23, 23' projecting outside the case 24, respectively, and either one of the left and right differential output gears 40, 40 'is provided with a side clutch. One of the gears 16 and 16 'is always meshed, and the other of the left and right differential output gears 40 and 40' is always meshed with the other of the side clutch gears 16 and 16 'via the reverse gear 41. The differential mechanism 22
If the left differential output shaft 23 is X, the right differential output shaft 23 'is Y, and the case 24 is Z, Z = (X + Y)
÷ 2. That is, when the case 24 stops with respect to the left differential output shaft 23 and the right differential output shaft 23 ′, Z becomes 0 and 0 = X + Y, and therefore X = −.
The rotation of the side clutch gears 16 and 16 ′ is performed in the same direction at the same rotation speed via the reversing gear 41, and the vehicle travels straight. Also, let X be 100 and Z
If Y is set to 10, Y becomes -80, and Y is rotated slowly with respect to X. As a result, gentle turning can be performed by driving and rotating the axle on the inside of the turn slower than the axle on the outside of the turn. That is, the turning radius becomes smaller in proportion to the increase in the rotation speed of Z.

When X is set to 100 and Z is set to 50, Y is set to 0, and Y is stopped with respect to X. As a result, since the reversing gear 41 is present, the axle on the inner side of turning is stopped. It will be a brake turn. Also, if X is 10
Assuming that 0 and Z are 100, Y is 100, and Y is rotated in the same direction with respect to X. As a result, since the reversing gear 41 is provided, the axle on the inner side of the turning is driven opposite to the axle on the outer side of the turning. You can make a spin turn. That is, when Z is rotated by 50 or more, a spin turn can be performed by driving and rotating the axle on the inside of the turn opposite to the axle on the outside of the turn, and the turning radius becomes smaller in proportion to the increase in the number of rotations of Z. . Therefore, in the embodiment, the turning radius of the gentle turning gradually decreases, and the brake turns,
By switching from a gentle turn to a spin turn after a brake turn, and controlling the number of rotations of Z, it is possible to restrict the turning radius of the spin turn and to avoid unnecessary sudden turns.

When the case 24 is rotated in the reverse direction,
For example, if X is 100 and Z is a reverse rotation of -10, Y becomes -120, and Y is rotated faster with respect to X. As a result, the axle on the outer side of the turn is driven faster than the axle on the inner side of the turn. In this case, the turning radius is reduced in proportion to the increase in the reverse rotation speed of Z. It is also possible to set the initial Z = (X + Y) ÷ 2 to Z = X + Y and various ratios. If the differential mechanism 22 enables gentle turning, a brake turn, and a spin turn, it is possible. good. In this case, the configuration of the mission of the embodiment is such that the differential output shafts 23 and 23 ′ of the differential mechanism 22 are provided.
Is transmitted to the axles 20, 20 'via the side clutch gears 16, 16', so that either one of the left and right differential output gears 40, 40 'and the side clutch gear 16,
The reverse gear 41 is provided between any of the gears 16 ′ and 16 ′.
The reversing gear 41 may be omitted, and the differential output shafts 23 and 23 ′ may be rotated by the differential mechanism 22 in a reverse rotation relationship with each other. Thus, the traveling hydraulic main transmission 2 and the turning hydraulic transmission 29 are configured such that the output torque of the turning hydraulic transmission 29 is large.
That is, by increasing the output torque of the turning hydraulic transmission 29, turning performance in wet fields and the like is improved, traveling is stabilized, and work efficiency is improved. Although the specific configuration is optional, the turning hydraulic transmission 29 is made larger than the traveling hydraulic main transmission 2 to increase the capacity (output torque).
Or at least the turning hydraulic transmission 29 is constituted by a variable pump and a variable motor,
Hydraulic main transmission 2 for traveling with variable output torque
A larger torque may be output.

The turning hydraulic transmission 29
Is configured to be operated by a steering lever 42 for operating the traveling direction, a sector gear 44 is fixed to a trunnion shaft 43 of the turning hydraulic transmission 29, a pinion gear 45 is meshed with the sector gear 44, and the pinion gear 45 is Output shaft 48 of transmission motor 47 with built-in motor 46
So that the potentiometer 46 detects the neutral position of the turning hydraulic transmission 29 (the stopped state of the turning hydraulic transmission 29), so that the steering lever 42 is in the neutral state. When the field is inclined and the vehicle slowly turns toward the lower side of the slope, the one of the left and right side clutches 15, 15 'is automatically disengaged and the turning hydraulic transmission 29 is operated. Then, the case 24 of the differential mechanism 22 is rotated, so that the case is corrected so as to be directed to a higher side of the slope, and the aircraft is caused to travel straight. That is, by controlling the on / off state of the left and right side clutches 15 and 15 ′ and controlling the rotational speed of the case 24 by the turning hydraulic transmission 29 to reduce or increase the rotation speed,
Correct the oblique direction of the aircraft on the sloped ground (oblique traveling during the straight traveling operation) and make the aircraft travel straight.

In this case, the inclination of the field may be detected by any means, and the configuration is not limited. However, if the inclination is detected by the inclination sensor 50 provided at the desired position of the machine body, the control operation speed is increased and the response is prompt. That is, when the reaper does not have an automatic direction control device for automatically controlling the direction by providing a direction sensor, or even when having an automatic direction control device, it does not operate by traveling in a field without grain culm. Occasionally, the aircraft is automatically moved straight ahead, thereby improving operability. 51
Is a controller, 52 is an automatic straight-running control on / off switch, 5
Reference numeral 3 denotes a vehicle speed sensor, and reference numeral 54 denotes a predetermined value change dial for changing a control start predetermined value for preventing automatic straight-ahead control when the inclination is equal to or less than a predetermined value. Thus, FIG.
FIG. 8 shows another embodiment for detecting the inclination of the field, in which the crawler 57 is moved up and down between the traveling device 55 and the body frame 56 with respect to the body frame 56 so that the body is horizontally moved with respect to the left and right inclination of the field. A rolling mechanism L is provided, and the amount of rolling is detected by a stroke sensor 59 of a rolling cylinder 58 of the rolling mechanism L to detect the inclination of the field, whereby the differential mechanism 22 is operated to perform automatic straight-ahead control. Reference numeral 60 denotes a horizontal control on / off switch.

In this case, when the amount of rolling is detected by the stroke sensor 59, the actual left and right crawlers 5 are detected.
7 can be controlled based on the amount of settlement, and the control accuracy is high. In addition, it is preferable to perform the automatic straight-ahead control when the inclination is equal to or more than a predetermined rolling amount, because it is possible to prevent a so-called hunting decrease in which the on-off is frequently switched, and if the predetermined value of the rolling amount can be changed, operability is improved. Is more preferable. Thus, the control is to correct the tilt caused by the inclination of the field, but not in the field, but also when the right and left balance of the weight of the aircraft becomes imbalanced,
An oblique phenomenon may occur. In this case as well, the inclination sensor 50 and the stroke sensor 5 of the rolling cylinder 58 are used.
9 detects the inclination of the body and corrects the inclination caused by the inclination of the body. For example, in a case where the reaper 61 is provided in the front part of the fuselage so as to be movable in the left-right direction, if the reaper 61 is moved to one side from the fuselage, the weight balance is thereby disturbed, and the slope may be inclined. Is corrected and the vehicle travels straight (FIG. 10). 63 is a detection member for detecting the position of the mowing part.

Similarly, in a case where a threshing device 64 is provided on one side of the body and a Glen tank 65 is provided on the other side,
If grains accumulate in the Glen tank 65, the Glen tank 65 side becomes heavier, the weight balance may be lost, and the slope may be inclined,
This is corrected so that the vehicle travels straight (FIG. 10). Then
The axle inside the turning is configured to be decelerated and reversely controlled in accordance with the tilt operation angle of the steering lever 42, and separately,
Spin on / off switch (spin turn on / off switch) 66
The spin on / off switch 66 is provided even when the tilt operation angle of the steering lever 42 is in the spin turn executable area.
Is turned off, the spin on / off switch 66 is operated by the steering lever 42.
(FIG. 12). In this case, the spin on / off switch 6
6 is configured to decelerate and reverse the axle inside the turning in accordance with the tilting operation angle of the steering lever 42 when the steering lever 42 is turned on. Shift to spin on / off switch 6
It is preferable to set the brake turn state without spin-turning by turning 6 to improve the operability.
FIGS. 13 and 14 show another embodiment, in which the steering lever 42 is rotatably mounted in a front-rear direction with respect to a fixed portion 68 by a horizontal shaft 67 in the left-right direction. The reaping unit 61 is configured to be manually operable up and down, and a frame 69 is attached to the horizontal axis 67. The lever axis 70 of the longitudinal axis of the steering lever 42 with respect to the frame 69 is centered on the lever axis 70. A rotation operation (twist) is configured to be possible, and an operation operation of the turning hydraulic transmission 29 is performed by rotation of the steering lever 42.

The steering lever 42 is constructed so that the frame 69 is attached to the horizontal shaft 67 so as to be able to be pushed and pulled in the axial direction of the lever shaft 70, and one operation is performed by pushing and twisting. Then, the operator reliably recognizes the operation consciousness and prevents an erroneous operation. Reference numeral 71 denotes a main transmission lever for operating the traveling hydraulic main transmission 2, and reference numeral 72 denotes an auxiliary transmission lever for changing the meshing of the gear group gear group 6 of the auxiliary transmission shaft 5.

Next, the operation will be described. The rotation from the engine is transmitted to the input pulley 3, the rotation of the input pulley 3 is shifted by the traveling hydraulic main transmission 2 and transmitted to the input shaft 4, and the rotation of the input shaft 4 is transmitted from the auxiliary transmission shaft 5 to the center gear. 1
1 → transmitted to the side clutch shaft 13 via the passive gear 12. In normal running, the left and right side clutches 15, 1
5 'is turned on, the rotation of the side clutch shaft 13 is transmitted to the side clutch gears 16 and 16', and the side clutch gears 16 and 16 'are always meshed intermediate gears 18 and 18'.
The left and right gears 19 and 19 ′ are rotated through
9 and 19 'transmit rotation to the axles 20 and 20' via the always meshing axle gears 21 and 21 'to drive the traveling device to travel. In this case, a differential mechanism 22 having left and right differential output shafts 23 and 23 'is provided near the side clutch shaft 13, and the left and right differential output shafts 23 and 23' are provided with a left and right differential output gear 40, The left differential output gear 40 is always meshed with the left side clutch gear 16, and the right differential output gear 40 ′ is connected to the right side clutch gear 1.
Since the side clutch gears 6 and 16 'are always meshed with each other via the reverse rotation gear 41, the rotation of the side clutch gears 16 and 16' is always in a state where the rotation from the differential mechanism 22 is input. In the rotation stop state, the left and right differential output shafts 23 and 23 'are merely rotated by the same number in the opposite directions, so that they do not affect the straight running (including the reverse (back) running).

The left and right side clutches 15, 1
When one of 5 'is turned off, the turning side is turned inside with the turned off side. When one of the left and right side clutches 15, 15 ', for example, the right side clutch 15' is turned off, the right side clutch gear 16 'is in a free state. Is transmitted. That is, the differential mechanism 22 sets the left differential output shaft 23 to X, the right differential output shaft 23 'to Y,
Assuming that the case 24 is Z, Z = (X + Y) ÷ 2. Therefore, when the case 24 stops with respect to the left differential output shaft 23 and the right differential output shaft 23 ′, Z
Becomes 0 and 0 = X + Y, so that X = −Y, and X and Y only reverse each other, so that the side clutch gears 16, 1
6 ′ is rotated in the same direction at the same number of rotations, and goes straight. By rotating the case 24, for example, X is set to 100 and Z is set to 1
If 0, Y becomes -80, and Y is rotated at a rate of 20% deceleration with respect to X. As a result, gentle turning can be performed by rotating the axle on the inside of the turn slower than the axle on the outside of the turn. You.

If X is set to 100 and Z is set to 50, Y is set to 0 and Y is stopped with respect to X. As a result, since the reversing gear 41 is present, the axle on the inner side of turning is stopped. It becomes a brake turn, and the turning radius is reduced. If X is 100 and Z is 100,
Y becomes 100, and Y is rotated in the same direction with respect to X. As a result, since the reversing gear 41 is provided, a spin turn can be performed by driving and rotating the axle on the inside of the turn opposite to the axle on the outside of the turn. That is, when the vehicle is turning right, the right crawler is on the inside of the turn. Therefore, when the corresponding right side clutch 15 'is disengaged and the side clutch gear 16' and the right gear 19 'are in the free state, the case 24 The right differential output shaft 23 ′ (Y side) is rotated by the rotation of the left differential output shaft 23 (X
Side) or turn by transmitting reverse rotation.
On the other hand, if the case 24 is reversely rotated, for example, if X is 100 and Z is -10,
Is -120, and Y is rotated faster with respect to X. As a result, it is possible to perform gentle turning by rotating the axle on the outer side of the turn faster than the axle on the inner side of the turn. The turning radius becomes smaller in proportion to the rise. That is,
The rotation of the crawler on the outer side of rotation is accelerated without decreasing the rotation of the crawler on the inner side of rotation. When the side clutch gear 16 'and the right gear 19' are in a free state, the right differential output shaft 23 '(Y side) is moved from the left differential output shaft 23 (X side) by the reverse rotation of the case 24. It can turn quickly by transmitting rotation.

Thus, the traveling hydraulic main transmission 2 and the turning hydraulic transmission 29 are combined with the turning hydraulic transmission 29.
Since the output torque is increased, the turning performance in wet fields and the like is improved, traveling is stabilized, and work efficiency is improved. The turning hydraulic transmission 29 is larger than the traveling hydraulic main transmission 2 to increase the output capacity (output torque), or at least the turning hydraulic transmission 29 is a variable pump and a variable motor. In this case, the output torque can be changed to output a larger torque than that of the traveling hydraulic main transmission 2, and the configuration is simple. The traveling hydraulic main transmission 2 and the turning hydraulic transmission 29 are provided in the transmission case 1.
The front and rear parts are located in front of and behind the upper part of the gear, so that the overall left and right width can be narrowed. The transmission mechanism such as other pulleys as well as the entire transmission case 1 can be compactly arranged. In the embodiment, the traveling hydraulic main transmission 2
Is arranged on the front side, but may be arranged on the rear side.

However, since the field is inclined, the steering lever 42 of the hydraulic transmission 29 for turning is inclined toward the lower side of the slope despite the neutral state, or When the turning radius does not become constant, the case 24 by the turning-on / off state of the left and right side clutches 15 and 15 'and the case 24 by the turning hydraulic transmission 29 are controlled to reduce or increase the rotation speed. Therefore, one of the left and right side clutches 15 and 15 'is automatically disengaged, the hydraulic transmission 29 for turning is operated, and the case 24 of the differential mechanism 22 is rotated. Is corrected so as to travel, and the aircraft is caused to travel straight, or the turning radius is made constant.
Therefore, the aircraft automatically travels straight, or
Since the turning radius is kept constant, the operability is improved. In this case, the rotation of the hydraulic transmission 29 for turning may be transmitted through the differential mechanism 22 in accordance with the inclination so that the aircraft travels toward the side with the higher inclination. The direction can be corrected by transmitting the rotation of the differential mechanism 22 to the axle on the side of.

That is, the controller 51 detects the tilt angle of the steering lever 42 by the potentiometer 46 and comprehensively judges the vehicle speed detected by the vehicle speed sensor 53 and the detection value of the tilt sensor 50 or the stroke sensor 59. Thus, the on / off state of the left and right side clutches 15 and 15 ′ and the rotation speed of the case 24 by the turning hydraulic transmission 29 are controlled to be reduced or increased. The inclination of the field can be detected by any means, and the configuration is not limited.
Is preferable because the control operation speed is increased and the direction can be corrected quickly. Also, the tilt sensor 5
When the inclination is sensed and controlled by 0, the reaping unit is provided with a direction sensor, and there is no automatic direction control device for automatic direction control, or even if the automatic direction control device is provided, there is no grain culm in the field. Even when the vehicle is not operating while traveling, the aircraft automatically goes straight or the turning radius is kept constant, so that the operability is improved. In addition, as shown in FIGS. 7 and 8, when a rolling mechanism L that makes the body horizontal with respect to the left and right inclination of the field is provided, a rolling amount is detected by a stroke sensor 59 of a rolling cylinder 58 of the rolling mechanism L, If the inclination of the field is detected based on this and the automatic control is performed, the control can be performed based on the actual settlement amounts of the right and left crawlers 57, and the control accuracy is increased.

The automatic traveling direction control based on the inclination is as follows.
When the inclination of the body becomes equal to or more than a predetermined value, it is preferable to prevent a so-called hunting decrease in which the on / off is frequently switched, and it is preferable that the predetermined value of the inclination sensor 50 or the stroke sensor 59 can be changed. Operability is improved, which is more preferable. Thus, the control is
It corrects the inclination caused by the inclination of the field,
Even when the right and left balance of the weight of the body is not balanced, not the inclination of the field, the tilting phenomenon and the turning radius may be disturbed. In this case, the stroke of the inclination sensor 50 and the rolling cylinder 58 may also be caused. Since the inclination of the body can be sensed by the sensor 59, the on / off state of the left and right side clutches 15 and 15 ′ and the rotation of the case 24 by the hydraulic transmission 29 for rotation are reduced or increased according to the inclination of the body. To stabilize the steering. For example,
In the case where the reaper 61 is provided in the front part of the body so as to be movable in the left-right direction, when the reaper 61 is moved to one side from the body,
The detection member 63 indicates that the weight balance has been lost.
5, 15 'on-off state and turning hydraulic transmission 2
The case 24 is controlled so that the rotation speed is reduced or increased, and the steering is stabilized.

Similarly, in a case where a threshing device 64 is provided on one side of the body and a Glen tank 65 is provided on the other side,
When grains accumulate in the Glen tank 65, even when the Glen tank 65 side becomes heavy and the weight balance is lost, the on / off state of the left and right side clutches 15 and 15 'and the rotation of the case 24 by the turning hydraulic transmission 29 are reduced. Stabilize steering by controlling deceleration or speed-up rotation. Since the axle inside the turn is decelerated and reversely controlled in accordance with the tilt operation angle of the steering lever 42, a spin on / off switch (spin turn on / off switch) 66 is provided separately. Even if the tilt operation angle of the steering lever 42 is in the spin turn executable area, when the spin on / off switch 66 is turned off, the spin turn is not performed, and when the spin on / off switch 66 is turned on, the spin is turned on. Since the axle inside the turning is controlled to decelerate and reverse in accordance with the tilt operation angle of the lever 42, the spin turn and the brake turn are clearly distinguished to improve the operability, which is preferable. Since the switch 66 is provided, the operability is further improved.

In another embodiment shown in FIGS. 13 and 14, the steering lever 42 is rotatably mounted in the front-rear direction with respect to the fixed portion 68 by the horizontal shaft 67 in the left-right direction. The reaper 61 is configured to be manually operable up and down, and a frame 69 is attached to the horizontal axis 67. The lever axis 70 of the longitudinal axis of the steering lever 42 with respect to the frame 69 is the center of the lever axis 70. The turning hydraulic transmission 29 is operated by rotation of the steering lever 42, so that the on / off state of the left and right side clutches 15 and 15 'can be determined. In addition, the operation of decelerating or increasing the rotation speed of the case 24 by the turning hydraulic transmission 29 can be easily performed, and the operability is improved. When the steering lever 42 is attached to the frame 69 so as to be able to be pushed and pulled in the axial direction of the lever shaft 70 with respect to the horizontal shaft 67, and is configured to perform one operation by twisting while pushing, This is preferable because the user can reliably recognize the operation consciousness and prevent erroneous operation.

[0025]

The present invention includes a traveling hydraulic main transmission device 2, left and right side clutches 15, 15 ', a differential mechanism 22, and a turning hydraulic transmission device 29. , 15 ′, the turning hydraulic transmission 29 is configured to transmit the differential rotational power from the differential mechanism 22 to one of the cut sides. Since the transmission mechanism of the traveling device is configured to have a larger output capacity than that of the main transmission 2, the turning performance in wet fields and the like is improved, traveling is stabilized, and work efficiency is improved. In the present invention, the traveling hydraulic main transmission 2 and the turning hydraulic transmission 29 are
Since the transmission mechanism is a transmission mechanism for the traveling devices arranged in front and rear, the entire transmission case can be downsized. The present invention
The turning hydraulic transmission 29 transmits the rotation to the side where the left and right side clutches 15 and 15 ′ are disengaged in accordance with the inclination of the field, and corrects the deviation of the steering direction due to the inclination of the field so as to travel. Since the transmission mechanism of the traveling device is configured to be controlled, operability is improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a side clutch portion of a transmission case.

FIG. 2 is a schematic vertical sectional view of a differential mechanism portion of a transmission case.

FIG. 3 is an explanatory view of an arrangement of each shaft in a transmission case.

FIG. 4 is an explanatory view of an arrangement of each shaft in a transmission case.

FIG. 5 is a perspective view of a transmission case and an operation unit.

FIG. 6 is an explanatory diagram of output states of a traveling transmission and a turning transmission.

FIG. 7 is a block diagram.

FIG. 8 is a side view of the traveling device.

FIG. 9 is a block diagram.

FIG. 10 is a plan view of the combine.

FIG. 11 is a block diagram.

FIG. 12 is a side view of a steering lever.

FIG. 13 is a front view of another embodiment of the steering lever.

FIG. 14 is a side view of the same.

[Explanation of symbols]

1. Mission case 2: Hydraulic main transmission for traveling
3 input pulley, 4 input shaft, 5 auxiliary transmission shaft, 6 gear group, 7 counter shaft, 8 gear, 10 center shaft, 1
DESCRIPTION OF SYMBOLS 1 ... Center gear, 12 ... Passive gear, 13 ... Side clutch shaft, 15, 15 '... Left and right side clutch, 17 ... Left and right output shaft, 18 ... Intermediate gear, 19 ... Left and right gear, 20,2
0 ': axle, 21, 21': axle gear, 22: differential mechanism, 23, 23 ': left and right differential output shaft, 24: case, 2
5, 25 ': left and right bevel gears, 26, 26': shaft, 27, 2
7 ': intermediate bevel gear, 28: case rotating passive gear, 29 ...
Hydraulic transmission for turning, 30 ... case rotating gear, 31 ...
Intermediate shaft for turning, 32: Intermediate gear for turning, 33: Output gear for turning, 34: Output shaft for turning, 35: Input pulley for turning, 41: Reverse gear, 42: Steering lever, 43: Trunnion shaft, 44 ... Sector gear, 45 ... Pinion gear, 46
... Potentiometer motor, 47 ... transmission motor, 48 ... output shaft, 50 ... inclination sensor, 51 ... controller, 52 ... automatic linear control ON / OFF switch, 53 ... vehicle speed sensor, 54 ... predetermined value change dial, 55 ... traveling device, 56 ... frame, 57 ... crawler, 58 ... rolling cylinder, 59
... stroke sensor, 60 ... horizontal control on / off switch, 6
DESCRIPTION OF SYMBOLS 1 ... Cutting part, 63 ... Detection member, 64 ... Threshing device, 65 ...
Glen tank, 66: Spin on / off switch, 67: Horizontal axis, 68: Fixed part, 70: Lever axis, 69: Frame, 71
.., The main transmission lever, 72... The auxiliary transmission lever.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B62D 11/08 B62D 11/08 C 49/00 49/00 EF 55/116 55/116 F16H 39/04 F16H 39/04 (72) Inventor Naofumi Akiyama No. 1 Hachikura, Toze-cho, Toyo-cho, Iyo-gun, Ehime Prefecture, Iseki Agricultural Machinery Co., Ltd. Terms (Reference) 2B043 AA03 AB02 AB08 BA02 BA05 BB14 DB04 DB05 DB21 2B076 AA03 DA03 DB06 DB08 DD02 3D042 AB11 BA02 BB03 CA03 3D052 AA01 AA02 AA05 AA12 BB09 BB10 BB11 DD04 EE01 FF02 GG04 HH03 JJ08

Claims (3)

[Claims] 1. A hydraulic main transmission 2 for traveling, left and right side clutches 15, 15 ', a differential mechanism 22, and a hydraulic transmission 29 for turning. In the traveling device for transmitting the differential rotational power from the differential mechanism 22 to one of the cut sides, the turning hydraulic transmission 29 is provided with the traveling hydraulic main transmission. A transmission mechanism of a traveling device configured to have a larger output capacity than the transmission 2. 2. The transmission mechanism of a traveling device according to claim 1, wherein the traveling hydraulic main transmission 2 and the turning hydraulic transmission 29 are disposed in front and behind. 3. The turning hydraulic transmission 29 according to claim 1, wherein the turning hydraulic transmission 29 transmits rotation to the side where the left and right side clutches 15, 15 ′ are disengaged in accordance with the inclination of the field, and the steering direction due to the inclination of the field. A transmission mechanism of a traveling device configured to control the vehicle to travel while correcting the deviation.