JP2001253361A - Crawler travel vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and miniaturize the mounting structures of a speed changing pump 67 and a steering pump 69 and motors 68 and 70 thereof. SOLUTION: In a crawler travel vehicle, the speed changing pump 67, the motor 68, the steering pump 69 and the motor 70 are mounted on a transmission case 23. The driving force of an engine 21 is transmitted to the pump shaft 71 of one of the speed changing pump 67 and the steering pump 69, and the respective pump shafts 71 and 77 of the pumps 67 and 69 are connected together by gears 80, 81 and 82.

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, since both the variable speed pump and the steering pump are connected to the engine by a belt and driven, the installation space for each pump cannot be easily reduced, and the structure for mounting each pump and motor can be simplified. There is a problem that size and compactness cannot be easily achieved. In addition, by providing a gear pump used for PTO output or hydraulic charge in the transmission case,
There is a problem that the installation width of the transmission case is large, and the pinion shaft is press-fitted and fixed to the carrier of the planetary gear mechanism inside the transmission case. There is a defect. In addition, by providing the transmission case as an oil tank and providing a suction filter, the transmission case cannot be easily downsized and simplified, and the gears for shifting and steering can be connected to the planetary gear mechanism. Therefore, there is a problem that it is not easy to reduce the size and weight of the mission case.

[0003]

SUMMARY OF THE INVENTION The present invention is directed to a crawler traveling vehicle in which a transmission pump and a motor, a steering pump and a motor are mounted on a transmission case, and which is mounted on one pump shaft of the transmission or steering pump. By transmitting the engine driving force and connecting the pump shafts of the respective pumps with gears, each pump can be compactly installed on the upper part of the transmission case, as compared with the conventional method in which the engine driving force is belt-transmitted to the respective pumps. This facilitates simplification and downsizing of the mounting structure of each pump and motor.

A gear pump is connected to a pump shaft that transmits engine driving force via gears. An input pulley is provided on one of the pump shafts to transmit the engine driving force via a belt, and the other pump shaft is used for transmission. Thus, the drive structure and the mounting structure of the gear pump for driving the gear pump to generate the PTO oil pressure can be easily simplified and downsized.

Further, one end of a pinion shaft is press-fitted and fixed to a carrier of a planetary gear mechanism inside a transmission case for transmitting a shifting and steering driving force to the left and right traveling crawlers. When the pinion shaft with a simple fixed structure is pulled out by press-fitting, the pinion shaft is prevented from falling off even if the pinion shaft is pulled out, and the transmission final gear prevents damage to the inside of the transmission case due to the pinion shaft being pulled out. Can be done.

[0006] Further, a turning gear mechanism and a suction filter are disposed opposite to each other with a planetary gear mechanism inside a transmission case transmitting transmission gears for shifting and steering to right and left traveling crawlers. The outer shape of the mission case to be installed can be made compact, and the cost of the suction filter can be reduced easily by reducing the number of components and the like, as compared with the exterior type.

Further, the planetary gear mechanism inside the transmission case for transmitting the shifting and steering driving forces to the left and right traveling crawlers and the upper transmission gear are overlapped in a side view, so that the planetary gear mechanism and the transmission gear are installed. The required space can be reduced so that the size and weight of the mission case can be easily reduced.

[0008]

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 a 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.

The steering handle (19) is connected to the upper end of a handle shaft (28), and the handle shaft (28) is rotatably supported above 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) having 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 speed change output shaft (49) is rotatably supported above the steering output shaft (44) substantially in parallel with the shaft (44) inside the steering column (21), and a speed change 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.

Further, 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 continuously variable hydraulic 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).

Further, the planetary gear mechanism (97) includes 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).

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.

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).

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.

Further, a control cylinder (125) for projecting a control shaft (124) of the steering pump (69) for controlling the output by changing the swash plate angle to the rear side of the transmission case (23) and extending 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.

Also, 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.

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 transmission pump (67) and a transmission motor (68) for traveling speed change and a steering pump (69) and a steering motor (70) 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 mounted on 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, right and left turning gears are sandwiched by 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). 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.

[0033]

As is apparent from the above embodiments, the present invention relates to a crawler for mounting a speed change pump (67) and a motor (68), a steering pump (69) and a motor (70) to a transmission case (23). In the traveling vehicle, the driving force of the engine (21) is transmitted to one of the pump shafts (71) of the shift or steering pumps (67) (69), and the pump shafts (71) of the pumps (67) and (69) are transmitted. ) (77) connected to gears (80), (81) and (82), and a transmission case (23) as compared with the conventional case where the driving force of the engine (21) is transmitted to the pumps (67) and (69) by belt.
The pumps (67) and (69) can be compactly installed on the upper part, and the pumps (67) and (69) and the motor (68)
The mounting structure of (70) can be easily simplified and downsized.

Further, the engine (2) is connected via a gear (82).
1) A gear pump (7) is attached to a pump shaft (77) for transmitting the driving force.
9), an input pulley (74) is provided on one pump shaft (71) to transmit the driving force of the engine (21) to the belt (75), and the other pump shaft (77) is transmitted through the other pump shaft (77). The drive structure and the mounting structure of the gear pump (79) for driving the gear pump (79) to generate the PTO oil pressure can be easily simplified and downsized.

One end of the pinion shaft (106) is attached to the carrier (103) of 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). The pinion shaft (106) is press-fitted and fixed, and the other end of the pinion shaft (106) is opposed to the side surface of the transmission final gear (99). (10
6) is prevented by the transmission final gear (99), and damage to the inside of the transmission case (23) due to removal of the pinion shaft (106) can be easily prevented.

A turning gear (110) sandwiching a planetary gear mechanism (97) inside a transmission case (23) for transmitting a shifting and steering driving force to the left and right traveling crawlers (2).
The (111) mechanism and the suction filter (117) are disposed at opposing positions.
The transmission case (23) in which the (7) is installed can be formed in a compact outer shape, and can more easily prevent damage to the suction filter (117) and reduce costs by reducing the number of components compared to the exterior type. is there.

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) and the transmission gear (94) on the upper side.
(108) is overlapped in a side view, and the space required for installing the planetary gear mechanism (97) and the transmission gears (94) (108) is reduced to reduce the size and weight of the transmission case (23). It can be easily performed.

[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]

 (2) Traveling crawler (21) Engine (23) Transmission case (67) Transmission pump (68) Transmission motor (69) Steering pump (70) Steering motor (71) Pump shaft of transmission pump (77) Steering pump (79) Gear pump (80) (81) (82) Gear (94) Sub-transmission gear (transmission gear) (97) Planetary gear mechanism (99) Transmission final gear (103) Carrier (106) Pinion shaft (108) ) Slewing gear (transmission gear) (110) Left gear (slewing gear) (111) Right gear (slewing gear) (117) Suction filter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60K 25/02 B60K 25/02 F-term (Reference) 2B043 AA03 AB02 BA02 BB14 DA04 DB18 DC01 2B076 AA03 BA03 DA03 DA15 3D037 CA01 CB06 CB12 CB19 CB37 3D042 AA06 AB12 BA05 BA07 BA10 BA13 BC06 BC09 3D052 AA17 BB08 DD04 EE01 FF02 GG03 HH01 JJ08 JJ21

Claims (5)

[Claims] In a crawler traveling vehicle in which a shift pump and a motor and a steering pump and a motor are mounted on a transmission case, an engine driving force is transmitted to one pump shaft of a shift or steering pump, and each of the pumps is driven. A crawler traveling vehicle wherein each pump shaft is gear-connected. 2. The crawler traveling vehicle according to claim 1, wherein a gear pump is connected to a pump shaft that transmits an engine driving force via a gear. 3. One end of a pinion shaft is press-fitted and fixed to a carrier of a planetary gear mechanism inside a transmission case that transmits a driving force for shifting and steering to a left and right traveling crawler. The crawler traveling vehicle according to claim 1, wherein the crawler traveling vehicle is provided opposite to a side surface of the crawler traveling vehicle. 4. A revolving gear mechanism and a suction filter are disposed opposite to each other with a planetary gear mechanism inside a transmission case transmitting transmission gears for shifting and steering to right and left traveling crawlers. The crawler traveling vehicle according to 1. 5. The crawler according to claim 1, wherein the planetary gear mechanism inside the transmission case for transmitting the shifting and steering driving forces to the left and right traveling crawlers and the upper transmission gear are overlapped in a side view. Traveling car.