JP2001260932A - Crawler travel vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve drive operability and work efficiency. SOLUTION: A variable-speed pump 67, a variable-speed motor 68, a steering pump 69, and a steering motor 70 of a hydraulic continuously variable transmission structure are fitted to a transmission case 23 in this crawler travel vehicle. The connection length of a turning arm 130 changing the output of the steering motor 70 can be freely changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler traveling vehicle such as a combine or plowing tractor or a field management vehicle for continuously cutting and threshing grain culms in a field.

[0002]

Conventionally, a variable speed pump and motor having a continuously variable hydraulic structure for driving left and right traveling crawlers in the same direction, and a steering pump having a continuously variable hydraulic structure for driving left and right traveling crawlers in opposite directions. And a motor mounted on a transmission case that transmits driving force to the traveling crawler via a planetary gear mechanism, and controls the pumps and motor outputs for shifting and steering by operating the steering handle and the shift lever, thereby controlling both the left and right traveling crawlers. There is a technique of moving forward and backward and turning while transmitting the driving force to the vehicle. However, according to the prior art, the turning feeling of the steering handle cannot be easily switched in consideration of the working place or the driving feeling of the operator, and the variable speed pump and the motor and the steering pump and the motor are not changed. The structure to be attached to the transmission case cannot be easily simplified, and the steering handle and the shift lever cannot be easily connected to the output control units of the shift and steering pumps and motors. There are problems such as simplification of the transmission case structure to be mounted, simplification of assembly and maintenance work, improvement of handling operability, and the like.

[0003]

SUMMARY OF THE INVENTION The present invention is directed to a swing arm for changing a steering motor output in a crawler traveling vehicle in which a variable speed pump and a motor having a hydraulic continuously variable transmission structure and a steering pump and a motor are mounted on a transmission case. The connection length of the steering arm can be changed, and the steering output amount of the steering motor with respect to the steering wheel operation amount is changed by changing the connection length of the swivel arm, so that it can be changed according to the operating situation of the work place or worker. This makes it possible to obtain a sensitive or insensitive turning feeling, and to easily improve driving operability and work efficiency.

A connecting length changing member is attached to the turning arm so as to be adjustable in position so that the connecting length of the turning arm can be changed. It is easily obtained by attaching the changing member, and it is possible to easily simplify the turning feeling switching structure and improve the switching function.

[0005] Also, a shift control shaft for controlling the output of the shift motor and a steering arm for controlling the output of the steering motor are provided on the opposite side of the transmission case, and a straight-moving arm connected to the shift control shaft. A swing arm connected to the steering control shaft is provided on the same side of the transmission case. A speed change and steering pump and a motor are provided on one side of the transmission case, and input pulleys are installed on the other side, and each of the pumps In addition, the motor and the motor can be arranged in a functionally compact manner, and the structure for connecting the shift and steering control shafts to the steering handle and the shift lever can be easily simplified and the assembling workability can be easily improved.

A vehicle speed operation final member and a steering operation final member for transmitting operations of both the steering handle and the speed change lever are provided. A straight arm is connected to the vehicle speed operation final member, and a turning arm is connected to the steering operation final member. The connection and adjustment work between the vehicle speed operation and steering operation final member and the straight and turning arms can be performed on the same side of the transmission case, simplifying assembly work and improving handling operability such as maintenance. Can be easily achieved.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. Fig. 1 is an overall side view of the combine, Fig. 2
Is a plan view of the same, in which (1) is a track frame on which a pair of left and right traveling crawlers (2) are mounted, (3) is a machine frame installed on the track frame (1), and (4) is a feed chain. A threshing unit which stretches (5) to the left and incorporates a handling cylinder (6) and a processing cylinder (7), and (8) a cutting unit provided with a cutting blade (9) and a grain culm transport mechanism (10). , (11) is a hydraulic lifting cylinder that raises and lowers the cutting unit (8) via the cutting frame (12), (13) is a straw processing unit that faces the end of the straw chain (14), and (15) is a threshing unit A grain tank for carrying the grains from (4) through a frying cylinder (16);
(17) is a discharge auger for carrying out the grains of the tank (15) out of the machine, (18) is a driver's cab provided with a round steering handle (19) and a driver's seat (20), and (21) is a driver's cab. The engine is provided below the seat (20), and is configured to continuously cut and threat grain stalks.

Further, as shown in FIGS. 2 to 6, a steering column (21) is provided on the front upper surface of the cab (18).
The steering handle (19) is attached to the upper side of the upper surface of the steering column (21) so as to be rotatable around the longitudinal axis, and the side column (2) is mounted on the left side of the cab (18).
2), a transmission case (23) is disposed below the side column (22), and the main transmission lever (24), the auxiliary transmission lever (25), the reaping clutch lever (26), and the threshing clutch lever (27) are arranged. Attach it to the side column (22). The steering column (21) is
It is formed by molding an aluminum alloy casting, and is formed into a hermetically sealed box by fastening it with a plurality of bolts in a two-split structure that can be divided into right and left.

An upper end of a handle shaft (28) is connected to the steering handle (19), and the handle shaft (28) is rotatably supported on an upper portion of the steering column (21). The upper end of the steering input shaft (29) is rotatably supported at the upper part, and the gear (30) of the handle shaft (28) and the sector gear (31) of the steering input shaft (29) are meshed with each other. ) And (29) are connected, and the steering input shaft (29) is extended vertically at substantially the center inside the steering column (21).

Further, the steering column (21)
A bearing member (32) is detachably fixed to the left and right sides at substantially the center of the vertical width, and one end of the transmission input shaft (33) is rotatably supported by the bearing member (32) via a bearing in a cantilever manner. The input shaft (33) is supported substantially horizontally in the left-right direction, and a universal joint (34) is provided at the lower end of the steering input shaft (29).
, The upper end of the input fulcrum shaft (35) is connected, the input member (36) is fixed to the input fulcrum shaft (35), and the input member (36) is rotatably mounted on the speed change input shaft (33). The input connector (37) is detachably fixed to the input member (36), and the input member (36) is rotatably supported on the speed change input shaft (33) via a bearing. The steering input shaft (29) is rotatably supported at the center thereof. The forward / reverse rotation of the steering input shaft (29) causes the input member (36) to rotate forward / reverse around a substantially vertical axis of the input shaft (29). The input fulcrum shaft (35) and the input member (36) are rotated around the center line of the substantially horizontal input shaft (33) by the forward / reverse rotation of the speed change input shaft (33) to tilt forward and backward. Further, a universal joint (34) is attached to the intersection of the vertical steering input shaft (29) core and the left and right horizontal transmission input shaft (33) core at right angles, and the steering input of the steering handle (19) is provided. The input member (36) and the input connector (37) are rotated forward and reverse around the axis of the steering input shaft (29) by the forward / reverse operation of the shaft (29).

Further, the steering column (21)
The main transmission shaft (38) is rotatably supported on the lower front side of the
The left end of the main transmission shaft (38), which extends substantially horizontally in the left-right direction, protrudes to the left outside of the steering column (21), and is rotatable on the machine base (3) below the side column (22). The main transmission shaft (38) is connected to the provided intermediate shaft (39) via a rod (40), and the main transmission lever (24)
The main transmission shaft (38) is rotated forward and backward by a speed change operation of swinging the lever around the lever fulcrum shaft (41) in the front-rear direction. A main transmission shaft (38) is connected to a transmission input shaft (33) via a transmission arm (42) and a link (43), and the main transmission shaft (38) of the main transmission lever (24) is rotated forward and reverse to operate the main transmission shaft (38). The input member (36) is tilted back and forth about the center line of the transmission input shaft (33).

Further, a steering output shaft (44) of a cylindrical shape is rotatably mounted on the main transmission shaft (38), and the steering output link (45) is fixed to the steering output shaft (44).
Connect the upper end of the steering rod (46) to the input connector (37).
To the steering output link (4) via the universal joint (47) and the lower end of the steering rod (46) via the ball joint.
5) and a steering mechanism (4)
8).

Further, a transmission output shaft (49) is rotatably supported above the steering output shaft (44) and substantially in parallel with the shaft (44) inside the steering column (21), so that the transmission output link ( 50) is fixed to the transmission output shaft (49), the upper end of the transmission rod (51) is connected to the input connector (37) via a universal joint (52), and the transmission rod is connected via a ball joint. The lower end of (511) is connected to the transmission output link (50) to constitute a transmission mechanism (53) for changing the traveling speed and switching between forward and backward.

Furthermore, the inner steering operation shaft (54) and the outer speed change operation shaft (55) of a double shaft structure rotatable with respect to each other.
Is mounted rotatably at the center of the left and right widths on the lower rear side of the steering column (21). The transmission output shaft is provided via a ball-and-joint joint shaft (56) of variable length and transmission links (57) (58). The upper end of the speed change operation shaft (55) is connected to (49), and the steering output shaft (44) is connected via a ball joint joint shaft (59) and a steering link (60) (61) whose length is adjustable. To the upper end of the steering operation shaft (54).

The operating shafts (54) and (55) are erected substantially vertically on the same axis at the bottom of the steering column (21), and the upper ends of the operating shafts (54) and (55) are connected to the steering column (55). 21) Each output shaft (44) extended inside
(49) and the steering column (2
1) The lower ends of the operating shafts (54) and (55) are protruded below the bottom surface, and the lower ends of the operating shafts (54) and (55) are extended below the operator boarding step of the cab (20). The speed change operation shaft (5) through a vehicle speed link (62).
5) A vehicle speed rod (63) is connected to the lower end,
The turning rod (65) is connected to the lower end of the steering operation shaft (54) via the turning link (64).

Further, as shown in FIGS. 7 to 21, a hydraulic unit case (66) is detachably fixed to an upper left portion of the transmission case (23), and a transmission pump (67) and a motor having a hydraulic continuously variable transmission structure are provided. (68) and the steering pump (69) and the motor (70) in the case (66).
The input pulleys (73) and (7) are connected to the input shaft (72) of the transmission case (23) for connecting the pump shaft (71) of the transmission pump (67) by spline fitting.
4) and the engine (21) via the input belt (75)
Output shaft (76) and the steering pump (6).
9) The hydraulic gear pump (79) is connected to the input two shafts (78) of the transmission case (23) for connecting the pump shaft (77) by spline fitting.
2) and two input shafts (78) by gears (80), (81) and (8).
2) The pumps (67), (69), and (79) are operated by the driving force of the engine (21).

The motor shaft (8) of the transmission motor (68)
3) is connected to the three output shafts (84) of the transmission case (23) by spline fitting, and the steering motor (70) is connected.
The motor shaft (85) is connected to the four output shafts (86) by spline fitting, and is joined to the side of the transmission case (23) via an oil passage base (87) forming a hydraulic circuit. 8, the pump shafts (71) (77) and the motor shafts (83) (85) have different projecting lengths as shown in FIG. And (85) are connected to the shafts (72), (78), (84), and (86) facing each other by spline fitting in order, and the case (66) is assembled.

Further, a sprocket (89) for driving the traveling crawler (2) is fixed to an axle (90), and the left and right axles (90) are supported on a transmission case (23) via left and right axle cases (91). A transmission final shaft (92) is provided on the same axle between the left and right axles (90), and a sub transmission gear (93) (94) which is switched by a sub transmission lever (25) is connected via a sub-transmission mechanism. A speed change input shaft (95) and an output shaft (96) are provided, and each shaft (9
5) A final shaft (92) is connected to the output three shafts (84) via (96), and a traveling speed change output is transmitted to the left / right traveling crawler (2) via the left / right planetary gear mechanism (97) to advance or reverse. It is driven in reverse, and the output three axes (84)
And the auxiliary transmission input shaft (95) are connected by a main transmission output gear (98). The auxiliary transmission output shaft (96) and the transmission final shaft (92) are connected by a transmission final gear (99). A parking brake (100) is provided on the output shaft (96), and the left and right traveling crawlers (2) are braked by operating the brake (100).

The planetary gear mechanism (97) has a sun gear (10) fixed to the transmission final shaft (92).
1), a ring gear (102) supported by the axle (90) for free rotation, a carrier (103) fixed to the axle (90), and an inner gear (104) of the sun gear (101) and the ring gear (102). ), And a pinion for rotatably supporting the end of the final shaft (92) on the carrier (103) and press-fitting one end of the carrier (103) into the carrier (103). The planetary gear (105) is rotatably supported on the shaft (106).

Further, the auxiliary transmission input and output shaft (95)
(96) allows the revolving gears (107) and (108) to rotate freely, and connects the revolving gear (107) on the input shaft (95) to the output four shaft (86) with the gear (109);
A turning gear (108) on the output shaft (96) is connected to a gear (113) to a turning final shaft (112) for fixing left and right gears (110) and (111) for turning, and a left gear (1
10) is connected to the outer gear (114) of the left ring gear (102) via a reverse gear (115), while the right gear (111) is connected to the right ring gear (10).
2) meshes with the outer gear (114), and outputs the steering output via the left and right planetary gear mechanism (97) to the left and right traveling crawler (2).
Turn left or right to drive.

As described above, the variable speed pump (67), the motor (68) and the steering pump (69) having the hydraulic continuously variable transmission structure.
And a motor (70) mounted on a transmission case (23), a fixed shaft provided with a turning gear (108) as a turning transmission mechanism, a shift drive shaft for transmitting a shift driving force, and a traveling crawler (2). Case (23) as a parking brake shaft for braking
The auxiliary transmission output shaft (96), which is the same transmission shaft, is shared, and the functions of three shafts are shared by one of the auxiliary transmission output shafts (96).
In addition, the transmission case (23) and the transmission structure are reduced in size and manufacturing costs are reduced, and the auxiliary transmission gears (93) (94), which are gear mechanisms for transmitting the output of the transmission motor (68), and the steering motor (70). ) The turning gears (107) and (108), which are the gear mechanisms for transmitting the output, are connected to the auxiliary transmission input / output shaft (9) which is the transmission shaft in the transmission case (23).
5) The crawler (2) which is provided in common with (96) and which runs left and right
The number of mounting shafts for the straight traveling system and the revolving system for driving the crawler is reduced, and the drive structure for the left and right traveling crawlers (2) is made compact and simplified, and the transmission case (23) is reduced in size and weight and the manufacturing cost is reduced.

Further, as shown in FIG. 9, the gear pump (79) is hydraulically connected to an elevating valve (116) for controlling the operation of the elevating cylinder (11), and the operation in a transmission case (23) serving also as an oil tank is performed. The gear pump (79) sucks oil through the suction filter (117) and supplies the oil to the gear pump (7) supplied to the lifting cylinder (11).
9) The mowing section (8) is raised by the PTO oil pressure, and the pumps (67) and (69) and the motor (68) are raised.
(70) is hydraulically connected by main oil passages (118) and (119), and the main oil passages (118) and (119) are provided with charge oil passages (120) and (121) for replenishing hydraulic oil. (120) and (121) gear pump (7) through the tank port of the elevation valve (116).
9) is hydraulically connected to the main circuit (118) (119)
Is supplied from the gear pump (79).

As described above, the cutting section (8), which is a working section,
Speed change and steering pumps (67) (69) using the drain back pressure of the elevating valve (116) as a hydraulic valve for elevating
And a charge hydraulic pressure for the motors (68) and (70). The charge hydraulic pressure for the shift and steering pumps (67) and (69) and the motors (68) and (70) is adjusted by the cutting unit (8). The gear pump (2) which is supplied from the tank port of (116) and is provided for raising and lowering the cutting section (8)
3) The charge hydraulic pressure is supplied to each of the pumps (67) (69) and the motors (68) (70) by using the same function as the above (3), thereby simplifying the hydraulic structure provided in the transmission case (23) and reducing the manufacturing cost. , Shifting and steering pump (6
7) The operating pressure of the reaping unit (8) ascending check valve (116a) is set to be larger than the charge hydraulic pressure of the motors (68) and (70) and the pumps (67) and (69) and the motor (68). If the operating pressure of the check valve (116a) is smaller than the charge oil pressure of (70), the engine (23) is started with the lift cylinder (11) of the mowing part (8) being opened, Although there is a problem that the elevating cylinder (11) is extended by the charge oil pressure, the check valve (116
a) The above problem is solved by increasing the operating pressure, and the handling operation such as lifting and lowering or detaching of the mowing part (8) is simplified.

Further, as shown in FIGS. 10 to 16, the variable speed pump (67) whose output is controlled by changing the swash plate angle.
The control shaft (122) protrudes toward the front side of the transmission case (23), and the vehicle speed rod (63) is connected to a rectilinear arm (123) fixed to the control shaft (122). The speed change pump (67) is accelerated / decelerated and forward / reverse output controlled, and the left and right traveling crawlers (2) are driven in the same direction at the same rotation speed to move forward or backward, and by operating the steering handle (19) in the straight traveling state. The deceleration output of the variable speed pump (67) is controlled, and the steering wheel (1) is controlled.
Speed change motor (68) in proportion to the cut angle (turn radius) of 9)
The rotation speed (vehicle speed) is changed to reduce the speed.

A bearing cylinder (125) that projects a control shaft (124) of the steering pump (69), which controls the output by changing the swash plate angle, to the rear side of the transmission case (23) and extends in the front-rear direction. To the mission case (2
3) Fix to the upper surface, and turn the shaft (12
6) The control shaft (124) is rotatably inserted in the middle, and connected to the rear end of the turning shaft (126) extending in the front-rear direction via the arms (127) and (128) and the link (129). A turning arm (130) is fixed to the front end of the turning shaft (126), and a steering handle (19) is provided.
A turning feeling member (131) for changing the turning radius to be sensitive or insensitive to the left and right traveling crawlers (2) with respect to the cutting angle.
Is provided on the revolving arm (130), and the revolving rod (65) is connected to the revolving arm (130) via the revolving feeling member (131). (130) is fixed to the bolt (132) so that the position can be freely changed, and the detent pin (13) is fixed to the turning feeling member (131).
3) is passed through the swing arm (130), and the pin (1) is
33), a swivel rod (65) is connected thereto, and the length of the swivel rod (65) connected around the swivel axis (126) is switched to control the steering pump (69) with respect to the steering angle of the steering handle (19). To change the turning feeling.

The steering handle (19) in a straight traveling state
By operating the steering pump (69) to increase / decelerate and control the forward / reverse output, the left / right traveling crawler (2) is driven at the same rotation speed in the reverse direction, and the left / right traveling crawler (2) is rotated in the same direction while turning left. Alternatively, a brake turn for turning right or a spin turn for turning the inner traveling crawler (2) backward and turning left or right is performed, and the main speed change lever (2
4) The operation controls the steering pump (69) to increase or decrease the output in proportion to the output of the speed change pump (67). When the vehicle speed is changed by operating the main transmission lever (24), the turning outer traveling crawler (2) and the turning inner traveling are operated. The speed ratio of the crawler (2) is maintained substantially constant, and the vehicle speed (body center speed) is changed while the turning radius is maintained substantially constant, similarly to the operation of the accelerator pedal of the four-wheeled vehicle.

As described above, the variable speed pump (67), the motor (68) and the steering pump (69) having the hydraulic continuously variable transmission structure.
And in a crawler traveling vehicle having a motor (70) attached to a transmission case (23), a connecting length of a turning arm (130) for changing an output of a steering motor (70) is configured to be changeable, and the turning arm (130) is By changing the connection length, the steering output amount of the steering motor (70) with respect to the operation amount of the steering handle (19) is changed, and a sensitive or insensitive turning feeling is obtained according to the operating conditions such as the work place or the worker. In order to improve driving operability and work efficiency, a turning feeling member (131), which is a connecting length changing member, is attached to the turning arm (130) so as to be position-adjustable. Of the steering handle (19) by changing the connection length of the steering handle (19), and the turning feeling of the steering handle (19) is obtained by attaching the turning feeling member (131). Achieving such improvement in simplicity and switching function of Iringu switching structure.

A transmission control shaft (122) for controlling the output of the transmission motor (68) and a steering control shaft (124) for controlling the output of the steering motor (70) are connected to the transmission case (2).
3) a straight arm (123) projecting from the opposite side surface and connected to a shift control shaft (122); and a swing arm (130) connected to a steering control shaft (124).
Are provided on the same side of the transmission case (23), and the transmission and steering pumps (67) (69) and the motor (68)
(70) is provided on one side of the transmission case (23) and the input pulley (74) is provided on the other side.
7) (69) and the motors (68) and (70) are arranged in a functionally compact manner, and the shift and steering control shaft (1) for the steering handle (19) and the shift lever (24).
22) The connection structure of (124) is simplified and the assembling workability is improved.

Further, a vehicle speed rod (63) as a vehicle speed operation final member for transmitting operations of both the steering handle (19) and the main shift lever (24) and a turning rod (65) as a steering operation final member are provided. , Vehicle speed rod (6
3) is connected to a straight-ahead arm (123), and a swing rod (65) is connected to a swing arm (130). Can be connected and adjusted on the front side (same side) of the transmission case (23).
It is intended to simplify the assembling work and to improve handling operability such as maintenance.
The transmission and steering control shafts (122) and (124) are distributed and protruded from front and rear surfaces of a hydraulic unit case (87) in which the 9) and the motors (68) and (70) are integrally provided. A turning arm (130) is rotatably supported on the upper surface of the transmission case (23), and a rear end is connected to the steering control shaft (124). The straight arm (123) and the revolving arm (130) are arranged close to each other on the front side of the transmission case (23), and the rod (6) is fixed.
3) The structure for connection with (65) is simplified, and the assembling and maintenance work is easily performed in a state where the mowing part (8) is removed, thereby improving handling operability.

Further, as shown in FIGS. 10 and 14, a shift shaft (134) for switching the sub-transmission gears (93) (94) to low speed, neutral and high speed is mounted on a transmission case (2).
3) Protruding to the front side, fixing the sub-transmission arm (135) to the shift shaft (134), and connecting the sub-transmission lever (25) to the sub-transmission arm (135) via the sub-transmission rod (136).
The operation of connecting the vehicle speed rod (63), the turning rod (65), and the auxiliary transmission rod (136) is performed on the front side of the transmission case (23).

Further, as shown in FIGS. 12 and 14, a variable speed pump (67) and a variable speed motor (68) for traveling speed change and a variable speed pump (69) and a variable speed motor (70) for steering are connected to a transmission case. In the crawler traveling vehicle attached to (23), a space for installing a gear pump (79) is formed between the input pulley (74) for driving the pumps (67) and (69) and the transmission case (23), and the transmission pump (6) is provided.
7) The input pulley (74) is provided on the pump shaft (71), the gear pump (79) is provided on the pump shaft (77) of the steering pump (69), and the input belt (75) of the input pulley (74) is provided. The stretching direction and the installation position of the gear pump (79) are not limited to each other, and the gear pump (79) can be installed between the input belt (75) and the transmission case (23), and the input pulley (74) and the gear pump (79) can be installed. 79) are closely arranged on the same side of the transmission case (23) so as to be compactly arranged, so that the transmission structure can be reduced in size and weight and simplified.

As shown in FIGS. 8, 17 and 19,
The respective cases of the pump shafts (71) and (77) of the pumps (67) and (69) and the motor shafts (83) and (85) of the motors (68) and (70) provided inside the hydraulic unit case (66). (66), the pump shafts (71) and (77) and the motor shafts (83) and (85)
And the hydraulic unit case (66) is united with the transmission case (23) by spline fitting in order from the longest one to simplify the assembling work. A plug (137) with a hexagonal head is rotatably inserted into the hydraulic unit case (66) and screwed and fixed to each pump shaft (71) (77) and the motor shaft (83) (85). (13
The pump shaft (71) (77) and the motor shaft (8)
3) (85) rotates, and each axis (71) (77) (83)
Each shaft (72) (7) facing the spline groove of (85)
8) A transmission case of a hydraulic unit case (66) in which the pumps (67) and (69) and the motors (68) and (70) can be installed in such a manner that the operations can be performed to match the spline grooves of (84) and (86). (23) Pump shaft (71) of each pump (67) (69) from the side opposite to the mounting surface
(77) Alternatively, the motor shafts (83) and (85) of the motors (68) and (70) are manually rotatably mounted, and the shafts (71), (77) and (83) are operated by operating the plug (137).
(85) can be rotated to adjust the spline groove, and each pump shaft (71) (77) or each motor shaft (83) (8)
The spline fitting operation of 5) can be easily performed, and the assembling work for combining the hydraulic unit case (66) with the transmission case (23) can be simplified.

Further, as shown in FIG. 7, one pump shaft (71) of the shift or steering pumps (67) (69).
The driving force of the engine (21) is transmitted to the pump (6).
7) The pump shafts (71) and (77) of (69) are
0), (81) and (82), and the pumps (67)
The pumps (67) and (69) are compactly installed on the upper part of the transmission case (23), and the pumps (67) and (69) and the motor are compared with the conventional case in which the driving force of the engine (21) is transmitted to the belt by the engine (21). (68) The mounting structure of (70) is simplified and downsized, and the gear (82)
A gear pump (79) is connected to a pump shaft (77) of a steering pump (69) that transmits the driving force of the engine (21) through the pump, and a pump shaft (71) of one of the variable speed pumps (67).
Is provided with an input pulley (74) to transmit the driving force of the engine (21) to the belt (75), and to the other steering pump (6).
9) The gear pump (79) is driven via the pump shaft (77), and the input pulley (749) and the gear pump (79) can be installed close to the same side surface of the transmission case (23) to generate PTO oil pressure. The drive structure and mounting structure of the gear pump (79) are simplified and downsized.

As shown in FIG. 21, a pinion shaft (not shown) is attached to a carrier (103) of a planetary gear mechanism (97) inside a transmission case (23) for transmitting a shifting and steering driving force to a left and right traveling crawler (2). One end of the pinion shaft (106) press-fits and fixes one end of the pinion shaft (106) and the other end of the pinion shaft (106) supports the planetary gear (105) for free rotation.
Before the pinion shaft (106) falls off from the carrier (103), the pinion shaft (106) comes into contact with the side surface of the transmission final gear (99), and the pinion shaft (1)
06) is prevented, and even if the pinion shaft (106) having a simple fixed structure is removed by press-fitting, the pinion shaft (106) is prevented from falling off by the transmission final gear (99), and the pinion shaft ( 106) Damage inside the mission case (23) due to extraction can be prevented,

Further, the inner gear (104) of the planetary gear mechanism (97) inside the transmission case (23) for transmitting the driving force for shifting and steering to the left and right traveling crawlers (2) and the auxiliary gear serving as the upper transmission gear. Transmission gear (94) and swing gear (10)
8) is overlapped in a side view to reduce the space required for installing the planetary gear mechanism (97), the auxiliary transmission gear (94), and the turning gear (108) to reduce the size and weight of the transmission case (23). Aim.

As shown in FIG. 13, the planetary gear mechanism (97) inside the transmission case (23) for transmitting the shifting and steering driving forces to the left and right traveling crawlers (2) is a left and right turning gear. The gear (110) (111) mechanism and the suction filter (117) are arranged at opposing positions, and the auxiliary transmission output shaft (96) and the turning final shaft (11) are mounted on the peripheral surface of the ring gear (102) on the front side of the transmission case (23).
2), a suction filter (117) is provided close to the peripheral surface of the ring gear (102) on the rear side of the transmission case (23), and the outer shape of the transmission case (23) in which the suction filter (117) is provided is formed compactly. And a suction filter (11
7) To prevent damage and reduce costs by reducing the number of components.

As shown in FIGS. 7 and 13, a transmission case (commonly used for the revolving gears (107) and (108) as the revolving power transmission mechanism and for the auxiliary transmission gears (93) and (94) as the rectilinear power transmission mechanism). 23) a transmission motor shaft (83) and a steering motor shaft (85) are disposed at symmetrical positions about the auxiliary transmission input / output shafts (95) and (96), which are transmission shafts in 23);
In order to cope with the body structure such as the arrangement of the engine (21) or the transmission case (23), it is possible to easily change the specifications of the motor shafts (83) and (85) for shifting and steering by exchanging each other. Mission case (23)
The transmission pump shaft (71) is provided almost directly above the transmission motor shaft (83),
The steering pump shaft (77) is located almost directly above the steering motor shaft (85).
And the variable speed pump (67) and the motor (68) are arranged side by side in the horizontal direction with the steering pump (69) and the motor (70), and the input pulley (74) and the input pulley (74) are The transmission case (23) is compactly installed on the opposite side to the belt (75) to simplify the external structure of the transmission case (23) and make it more compact.

An auxiliary transmission output shaft (96) forming a transmission shaft commonly used for turning and straight transmission is provided with an axle (9) in a side view.
0), and a sub-transmission input shaft (95) forming a transmission shaft commonly used for turning and straight transmission is provided substantially directly above the sub-transmission output shaft (96) in a side view. )
(95) The speed change motor shaft (83) and the steering motor shaft (85) are arranged at symmetrical positions on the upward extension of a straight line connecting the centers of (96) and (9), and the speed change and steering motor shafts (83) (85) are arranged. The transmission structure from the gearbox to the axle (90) is simplified and made compact, and the transmission case (23) is made smaller and lighter.

[0039]

As is apparent from the above embodiments, the present invention relates to a transmission case (23) comprising a variable speed pump (67) and a motor (68), a steering pump (69) and a motor (70) having a hydraulic continuously variable transmission structure. ), The connecting length of the turning arm (130) for changing the output of the steering motor (70) is configured to be variable, and the steering handle is changed by changing the connecting length of the turning arm (130). (19) By changing the steering output amount of the steering motor (70) with respect to the operation amount, it is possible to obtain a sensitive or insensitive turning feeling according to the driving situation of the work place or the worker, and the driving operability is improved. It is possible to easily improve and improve the work efficiency.

A connecting length changing member (131) is attached to the turning arm (130) so as to be adjustable in position to change the connecting length of the turning arm (130). ) Can easily be obtained by attaching the connection length changing member (131), and the slewing feeling switching structure can be simplified and the switching function can be easily improved. is there.

A transmission control shaft (122) for controlling the output of the transmission motor (68) and a steering control shaft (124) for controlling the output of the steering motor (70) are connected to the transmission case (2).
3) a straight arm (123) projecting from the opposite side surface and connected to a shift control shaft (122); and a swing arm (130) connected to a steering control shaft (124).
Are provided on the same side of the transmission case (23), and the transmission and steering pumps (67) (69) and the motors (68) (70) are provided on one side of the transmission case (23) and input to the other side. By installing a pulley (74), the pumps (67) and (69) and the motors (68) and (70) can be functionally compactly arranged, and the steering handle (1) is provided.
9) It is possible to easily simplify the connection structure of the shift and steering control shafts (122) and (124) to the shift lever (24) and to improve the assembling workability.

Further, a vehicle speed operation final member (63) and a steering operation final member (65) for transmitting operations of both the steering handle (19) and the shift lever (24) are provided.
The straight speed arm (12
3), the turning arm (130) is connected to the steering operation final member (65), and the vehicle speed operation and steering operation final member (63) (65) is connected to the straight and turning arm (123). The connection and adjustment work of (130) can be performed on the same side surface of the mission case (23), so that assembling work can be simplified and handling operability such as maintenance can be easily improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine.

FIG. 2 is an overall plan view of the combine.

FIG. 3 is an explanatory perspective view of a traveling speed change and steering operation unit.

FIG. 4 is a side view of a steering column.

FIG. 5 is a front view of the same.

FIG. 6 is a partial plan view of the same.

FIG. 7 is a transmission drive system diagram.

FIG. 8 is a partial view of the same.

FIG. 9 is a shift and steering hydraulic circuit diagram.

FIG. 10 is a front view of a mission case.

FIG. 11 is a left side view of the same.

FIG. 12 is a right side view of the same.

FIG. 13 is an explanatory diagram of a gear arrangement of a transmission case.

FIG. 14 is a plan view of a transmission case.

FIG. 15 is a partial view of the same.

FIG. 16 is a rear view of the mission case.

FIG. 17 is a sectional view of a transmission gear arrangement.

FIG. 18 is a sectional view of a steering gear arrangement.

FIG. 19 is an enlarged view of the input side of FIG. 17;

FIG. 20 is a partially enlarged view of FIG. 18;

FIG. 21 is an enlarged view of the output side of FIG. 17;

[Explanation of symbols]

(19) Steering handle (23) Transmission case (24) Main speed change lever (63) Vehicle speed rod (vehicle speed operation final member) (65) Swivel rod (steering operation final member) (67) Speed change pump (68) Speed change motor (69) Steering pump (70) Steering motor (122) Shift control shaft (123) Straight-ahead arm (124) Steering control shaft (130) Swivel arm (131) Swing feeling member (connection length changing member)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 63/06 F16H 63/06 F-term (Reference) 2B076 AA03 DA03 DA15 DB08 3D040 AA01 AB04 AC28 AC43 AC50 AC55 AD02 3D052 AA06 AA19 DD04 EE01 FF02 GG04 HH02 3J067 AA02 AB01 AC42 AC51 BA04 BB07 DA03 FB81 GA14

Claims (4)

[Claims] In a crawler traveling vehicle in which a variable speed pump and a motor and a steering pump and a motor having a hydraulic continuously variable transmission structure are mounted on a transmission case, a connection length of a turning arm for changing a steering motor output is configured to be freely changeable. A crawler traveling vehicle characterized by that: 2. The crawler traveling vehicle according to claim 1, wherein a connection length changing member is attached to the swing arm so as to be adjustable in position to change the connection length of the swing arm. 3. A transmission arm for projecting a shift control shaft for controlling the output of the transmission motor, and a steering control shaft for controlling the output of the steering motor on opposite sides of the transmission case, and connecting to the transmission control shaft. The crawler traveling vehicle according to claim 1, wherein a turning arm connected to the steering control shaft is provided on the same side surface of the transmission case. 4. A vehicle speed operation final member and a steering operation final member for transmitting operations of both a steering handle and a shift lever are provided, a straight arm is connected to the vehicle speed operation final member, and a turning arm is connected to the steering operation final member. The crawler traveling vehicle according to claim 3, wherein the vehicle is connected.