JP5070250B2 - Crawler car - Google Patents

Description

  The present invention relates to a crawler traveling vehicle such as a combine, a tilling tractor, or a field management vehicle that continuously harvests and thresh cereals in a field.

  Conventionally, a variable speed pump and motor with a hydraulic continuously variable transmission structure that drives the left and right traveling crawlers in the same direction, and a steering pump and motor with a hydraulic continuously variable transmission structure that drives the left and right traveling crawlers in the opposite direction via a planetary gear mechanism. It is attached to the transmission case that transmits the driving force to the traveling crawler, and the pump and motor outputs for shifting and steering are controlled by operating the steering handle and shift lever, and the driving force is transmitted to both the left and right traveling crawlers while moving forward and backward. In addition, there is a technology for turning.

JP 2001-48047 A

  However, in the prior art, it is necessary to install a gear mechanism for transmitting the speed change motor output and a gear mechanism for transmitting the steering motor output in the transmission case. It is necessary to provide a gear pump for supplying charge hydraulic pressure to the gear shifting and steering pump and motor, and to simplify the hydraulic structure provided in the transmission case and reduce manufacturing cost. There is a problem that it cannot be easily performed.

Therefore, the invention according to claim 1 is a crawler traveling vehicle including an engine provided on a machine base, and a hydraulic unit case that outputs a traveling driving force from the engine to a left and right traveling crawler via a transmission case. An input shaft protrudes from one side of the upper part of the transmission case, an input pulley is pivotally supported at the protruding end of the input shaft, and the hydraulic unit case is detachably disposed on the other side of the upper part of the transmission case. The input pulley and the hydraulic unit case are supported so as to face each other with the upper part of the transmission case interposed therebetween, and the linear transmission pump and the transmission motor are installed in the hydraulic unit case, and the turning operation is performed. A directional pump and a steering motor are incorporated, and the speed change motor is arranged directly below the speed change pump, and directly below the direction pump. The steering motor is connected to the pump shaft of the variable speed pump connected to the input shaft, and the pump shaft of the steering pump is connected to the pump shaft via a gear. The control shaft of the transmission pump is arranged, the control shaft of the steering pump is arranged on the other side surface, and the straight arm fixed to the control shaft of the transmission pump is arranged on one side surface of the transmission case, A swivel arm connected to a control shaft of the steering pump via a link mechanism is provided on the same side surface of the transmission case where the straight arm is disposed, and the swivel arm is disposed close to the straight arm. It is characterized by that.

According to the first aspect of the present invention, in a crawler traveling vehicle including an engine provided on a machine base and a hydraulic unit case that outputs a traveling driving force from the engine to a left and right traveling crawler via a transmission case, The input shaft protrudes from one side of the upper part of the case, the input pulley is pivotally supported by the protruding end of the input shaft, and the hydraulic unit case is detachably placed on the other side of the upper part of the transmission case. The input pulley and the hydraulic unit case are supported so as to face each other, and the linear shift pump and shift motor and the turning steering pump and steering motor are built in the hydraulic unit case. The speed change motor is disposed directly below the speed change pump, and the steering motor is disposed directly below the speed control pump and connected to the input shaft. The pump shaft of the steering pump is connected to the pump shaft via a gear, and the control shaft of the transmission pump is arranged on one side surface of the hydraulic unit case, and the steering pump is connected to the other side surface. A control shaft is arranged, a rectilinear arm fixed to the control shaft of the transmission pump is arranged on one side of the transmission case, and a revolving arm is arranged that is connected to the control shaft of the steering pump via a link mechanism. Since the swivel arm is placed close to the straight arm , the mission case is placed vertically between the left and right traveling crawlers, and the traveling crawler and machine base, While improving the assembly workability of the transmission case, etc., the input pulley and hydraulic unit case are compacted at the top of the transmission case while ensuring a high ground clearance. Can be assembled to Doo, size and weight reduction and manufacturing cost reduction of the transmission case, together with the simplification of the assembling work of the transmission case, it is possible to provide a crawler vehicle capable of preventing damage to the transmission case.

In addition , the vertical and vertical widths of the hydraulic unit case can be compactly formed, but the speed change pump and speed change motor, and the steering pump and speed control motor can be functionally arranged to provide a simple gear structure. The speed change pump and the steering pump can be connected via each other. Also, the control shaft of the transmission pump and the control shaft of the steering pump can be separated from each other and installed on the side of the transmission case, and the assembly workability, maintenance, and adjustment of the link mechanism that connects to each control shaft It is possible to provide a crawler traveling vehicle that can improve workability, reduce the size and weight of the transmission case, reduce the manufacturing cost, and simplify the assembly operation of the transmission case.
Further, it is possible to simplify the connection structure of the shift pump and the control shaft of the steering pump with respect to the steering handle and the shift lever, and to improve the assembly workability. In addition, it is possible to easily perform assembly and maintenance work with the cutting unit removed, and to improve handling operability.

The whole side view of a combine. The whole top view of a combine. Explanatory perspective view of traveling speed change and steering operation section. The side view of a steering column. The front view. The partial top view. Mission drive system diagram. FIG. Shift and steering hydraulic circuit diagram. The front view of a mission case. The left side view. The right side view. Gear arrangement explanatory drawing of a mission case. The top view of a mission case. FIG. The rear view of a mission case. Sectional drawing of a transmission gear arrangement. Sectional drawing of steering gear arrangement. The input side enlarged view of FIG. The elements on larger scale of FIG. The output side enlarged view of FIG.

  Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an overall side view of the combine, and FIG. 2 is a plan view thereof. In FIG. 1, (1) is a track frame on which a pair of left and right traveling crawlers (2) are installed, and (3) is the track frame (1). A machine base to be installed, (4) is a threshing section that stretches the feed chain (5) to the left and incorporates a handling cylinder (6) and a processing cylinder (7), (8) is a cutting blade (9) and grains A cutting part provided with a reed transport mechanism (10), (11) is a hydraulic lifting cylinder that lifts and lowers the cutting part (8) via a cutting frame (12), and (13) faces the end of the waste chain (14) A waste disposal section, (15) is a grain tank that carries the grain from the threshing section (4) through the milling cylinder (16), and (17) carries the grain from the tank (15) out of the machine. A discharge auger, (18) a cab with a round steering handle (19) and a driver seat (20), 21) is an engine provided in the driver's seat (20) downward, and configured to threshing continuously harvests culms.

  Further, as shown in FIGS. 2 to 6, a steering column is vertically fixed on the upper surface of the front portion of the cab (18), and the steering handle (19) is rotatable about the vertical axis above the upper surface of the steering column. At the same time, a side column (22) is provided on the left side of the cab (18), a transmission case (23) is provided below the side column (22), a main transmission lever (24), an auxiliary transmission lever (25), a cutting A clutch lever (26) and a threshing clutch lever (27) are attached to the side column (22). The steering column is formed by molding an aluminum alloy casting, and is formed in a sealed box shape by fastening with a plurality of bolts in a split structure that can be divided into left and right.

  The steering handle (19) is connected to the upper end side of the handle shaft (28) so that the handle shaft (28) is rotatably supported on the upper part of the steering column, and the steering input shaft (29) is provided on the upper part of the steering column. The upper end portion is rotatably supported, and the gear (30) of the handle shaft (28) and the sector gear (31) of the steering input shaft (29) are engaged with each other to connect the shafts (28) and (29). The steering input shaft (29) is extended vertically in the approximate center inside the column.

  Further, the bearing member (32) is detachably fixed at the middle of the vertical width on the left side surface of the steering column, and one end portion of the speed change input shaft (33) is rotatable to the bearing member (32) via the bearing. The shift input shaft (33) is supported substantially horizontally in the left-right direction, and the upper end side of the input fulcrum shaft (35) is connected to the lower end of the steering input shaft (29) via the universal joint (34). The input member (36) is fixed to the input fulcrum shaft (35), the input member (36) is rotatably attached to the transmission input shaft (33), and the input connector (37) is attached to and detached from the input member (36). The input member (36) is rotatably supported on the transmission input shaft (33) via a bearing, and the input member (36) is rotatably supported around the steering input shaft (29). Of the steering input shaft (29) The input member (36) is forward / reversely rotated about the substantially vertical input shaft (29) core line by the reverse rotation, and the substantially horizontal input shaft (33) core line is input by the forward / reverse rotation of the speed change input shaft (33). The fulcrum shaft (35) and the input member (36) are rotated and tilted in the front-rear direction. Further, a universal joint (34) is attached to the intersection where the vertical steering input shaft (29) core wire and the horizontal shifting input shaft (33) core wire intersect at right angles, and the steering input of the steering handle (19) is made. The input member (36) and the input coupling body (37) are rotated in the forward and reverse directions around the steering input shaft (29) core wire by the forward rotation operation of the shaft (29).

  Further, the main transmission shaft (38) is rotatably supported on the lower front side of the steering column, and the left end of the main transmission shaft (38) horizontally mounted in the left-right direction protrudes outward on the left side of the steering column. The main transmission shaft (38) is connected via a rod (40) to an intermediate shaft (39) provided rotatably on the machine base (3) below the side column (22), and the main transmission lever (24) The main transmission shaft (38) is rotated in the forward and reverse directions by a speed change operation that swings the lever around the lever fulcrum shaft (41). The main transmission shaft (38) is connected to the transmission input shaft (33) through the transmission arm (42) and the link (43), and the main transmission shaft (38) of the main transmission lever (24) is operated in the forward and reverse directions. The input member (36) is tilted back and forth around the core line of the transmission input shaft (33).

  Further, a cylindrical shaft type steering output shaft (44) is rotatably attached to the main transmission shaft (38), the steering output link (45) is fixed to the steering output shaft (44), and the steering rod The upper end of (46) is connected to the input connector (37) via a universal joint (47), and the lower end of the steering rod (46) is connected to the steering output link (45) via a ball joint. A steering mechanism (48) for connecting and changing the travel path is configured.

  Further, a shift output shaft (49) is rotatably supported inside the steering column above the steering output shaft (44) and substantially parallel to the shaft (44), and the shift output link (50) is connected to the shift output shaft. (49) and the upper end of the speed change rod (51) is connected to the input connector (37) via a universal joint (52), and the lower end of the speed change rod (51) via a ball joint. Is connected to the speed change output link (50) to constitute a speed change mechanism (53) for changing the traveling speed and switching between forward and backward travel.

  Furthermore, the inner steering operation shaft (54) and the outer speed change operation shaft (55) of a double shaft structure that can rotate with each other are rotatably mounted at the center of the left and right widths on the lower rear side of the steering column. An upper end portion of the speed change operation shaft (55) is connected to the speed change output shaft (49) via a speed adjustable ball joint shaft (56) and speed change links (57) (58), and the length of the ball is adjustable. An upper end portion of the steering operation shaft (54) is connected to the steering output shaft (44) through the joint shaft (59) and the steering links (60) (61).

  The operation shafts (54) and (55) are erected on the bottom of the steering column substantially vertically on the same axis, and the upper ends of the operation shafts (54) and (55) are extended inside the steering column. The output shafts (44) and (49) are connected to each other, and the lower ends of the operation shafts (54) and (55) are projected below the bottom surface of the steering column, and the operations are performed on the lower side of the operator boarding step of the cab (20). A shaft (54) (55) is extended at the lower end side, and a vehicle speed rod (63) is connected to the lower end portion of the speed change operation shaft (55) via a vehicle speed link (62), and a turning link (64) is connected. The swivel rod (65) is connected to the lower end of the steering operation shaft (54).

  Further, as shown in FIGS. 7 to 21, a hydraulic unit case (66) is detachably fixed to the upper left portion of the transmission case (23), and a transmission pump (67) and a motor (68) having a hydraulic continuously variable transmission structure are provided. In addition, the steering pump (69) and the motor (70) are installed in the case (66), and the input shaft of the transmission case (23) for connecting the pump shaft (71) of the transmission pump (67) by spline fitting. (72) is connected to the output shaft (76) of the engine (21) via the input pulleys (73) (74) and the input belt (75), and the pump shaft (77) of the steering pump (69) is connected to the spline. The hydraulic gear pump (79) is connected to the input two shafts (78) of the transmission case (23) to be connected by fitting, and the input one shaft (72) and the input two shafts (78) are connected to the gear ( 0) (81) (82) is connected, each pump (67 by the engine (21) driving force) (69) (79) to operate the.

  The motor shaft (83) of the transmission motor (68) is connected to the output three shafts (84) of the transmission case (23) by spline fitting, and the motor shaft (85) of the steering motor (70) is connected to the four output shafts. On the mounting surface (88) of the case (66), which is connected to the side surface of the transmission case (23) via an oil passage base (87) that forms a hydraulic circuit, while being connected to (86) by spline fitting, FIG. As described above, the projecting lengths of the pump shafts (71) (77) and the motor shafts (83) (85) are made different, and the shafts (71) (77) (83) (85) are opposed in order from the longest one. The shafts (72), (78), (84) and (86) to be connected are connected by spline fitting, and the case (66) is assembled.

  Furthermore, the sprocket (89) that drives the traveling crawler (2) is fixed to the axle (90), and the left and right axles (90) are pivotally supported by the transmission case (23) via the left and right axle cases (91). A sub-speed change input shaft (92) is provided between the axles (90) on the same axis, and is connected via a high and low sub-speed gear (93) (94) mechanism that is switched by the sub-speed change lever (25). (95) and an output shaft (96) are provided, a final shaft (92) is connected to the three output shafts (84) via the shafts (95) and (96), and a left and right planetary gear mechanism (97) is connected. The travel shift output is transmitted to the left and right travel crawlers (2) to drive forward or backward, and the output three shafts (84) and the sub shift input shaft (95) are connected by a main shift output gear (98), Variable speed output shaft 96) and a transmission final shaft (92) are connected by a transmission final gear (99), and a parking brake (100) is provided on the auxiliary transmission output shaft (96), and the left and right traveling crawlers (2) are operated by operating the brake (100). ).

  The planetary gear mechanism (97) includes a sun gear (101) fixed to the transmission final shaft (92), a ring gear (102) supported on the axle (90) and the axle (90). A carrier (103) to be fixed and three planetary gears (105) meshing with the sun gear (101) and the inner gear (104) of the ring gear (102) are provided, and the end of the final shaft (92) is connected to the carrier (103). ), And the planetary gear (105) is supported on the pinion shaft (106) whose one end is press-fitted and fixed to the carrier (103).

  Further, a swing gear (107) (108) is supported by the auxiliary transmission input and output shafts (95) and (96) as idle shafts, and a swing gear (95) on the input shaft (95) is supported by the output four shafts (86). 107) is connected to the gear (109), and the turning gear (108) on the output shaft (96) is connected to the turning final shaft (112) for fixing the left and right gears (110) and (111) for turning. The left gear (110) is connected to the outer gear (114) of the left ring gear (102) via the reverse gear (115), while the right gear (111) is connected to the right ring gear (102). To the left and right traveling crawlers (2) via the left and right planetary gear mechanism (97) to drive left or right turning.

  As described above, in the crawler traveling vehicle in which the transmission pump (67) and motor (68), the steering pump (69) and the motor (70) of the hydraulic continuously variable transmission structure are attached to the transmission case (23), A fixed shaft provided with a certain turning gear (108), a speed change drive shaft for transmitting the travel speed change driving force, and a parking brake shaft for braking the travel crawler (2) are the same transmission shaft in the transmission case (23). The transmission output shaft (96) is shared, and the functions of the three shafts are provided to the one auxiliary transmission output shaft (96), so that the transmission case (23) and the transmission structure can be made compact and the manufacturing cost can be reduced. The sub-transmission gears (93) and (94) which are gear mechanisms for transmitting the output of the transmission motor (68) and the turning gear (107) which is a gear mechanism for transmitting the output of the steering motor (70). 108) is provided in common with the auxiliary transmission input / output shafts (95) (96), which are transmission shafts in the transmission case (23), and the number of mounting shafts of the straight traveling system and the turning system for driving the left and right traveling crawler (2) is set. The left and right traveling crawler (2) drive structure is made compact and simplified, the mission 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 hydraulic oil in the transmission case (23) also serving as an oil tank is suctioned. The gear pump (79) sucks in through the filter (117) and raises the cutting part (8) by the PTO hydraulic pressure of the gear pump (79) supplied to the elevating cylinder (11), while each pump (67) (69 ) And motors (68) and (70) are hydraulically connected by main oil passages (118) and (119), and charge oil passages (120) and (121) for supplying hydraulic oil to the main oil passages (118) and (119) are provided. A gear pump (79) is hydraulically connected to the charge oil passages (120) and (121) via the tank port of the lift valve (116), and the main circuit ( 18) (119) to thereby supply the charge oil from the gear pump (79).

  As described above, the shift and steering pumps (67) (69) and the motor (68) using the drain back pressure of the lifting valve (116) which is a lifting and lowering hydraulic valve (8) which is the working part. The charge hydraulic pressure of the shift and steering pumps (67), (69) and the motors (68), (70) is formed in the cutting oil pressure raising / lowering valve (116) tank. The charge hydraulic pressure is supplied to the pumps (67) (69) and the motors (68) (70) using the gear pump (23) provided for lifting and lowering of the cutting part (8), and the transmission case (23). ) Simplification of the hydraulic structure provided in the structure and reduction of the manufacturing cost, and check for raising the cutting part (8) rather than the charge hydraulic pressure of the speed change and steering pumps (67) (69) and motors (68) (70). When the operating pressure of the check valve (116a) is smaller than the charge hydraulic pressure of the pumps (67) (69) and the motors (68) (70), the cutting pressure (8) When the engine (23) is started with the lift cylinder (11) opened, there is a problem that the lift cylinder (11) is extended by the charge hydraulic pressure, but the check valve (116a) is more than the charge hydraulic pressure. By increasing the operating pressure, the above problems are eliminated, and handling operations such as raising and lowering or detaching of the cutting part (8) are simplified.

  Further, as shown in FIGS. 10 to 16, the control shaft (122) of the transmission pump (67) whose output is controlled by changing the swash plate angle is projected to the front side of the transmission case (23) and fixed to the control shaft (122). The vehicle speed rod (63) is connected to the linear arm (123) to be driven, and the speed change pump (67) is controlled to increase / decrease and forward / reverse output by operating the main speed change lever (24), and the left and right traveling crawlers (2) are moved in the same direction. Drives at the same rotational speed to move forward or backward, and controls the deceleration pump (67) to decelerate output by operating the steering handle (19) in a straight traveling state, and is proportional to the turning angle (turning radius) of the handle (19). The speed (vehicle speed) of the speed change motor (68) is changed to decelerate.

  Further, the control shaft (124) of the steering pump (69) whose output is controlled by changing the swash plate angle is projected to the rear side of the transmission case (23), and a bearing cylinder (125) extending in the front-rear direction is provided in the transmission case. (23) It is fixed to the upper surface, the middle of the pivot shaft (126) is rotatably inserted in the bearing cylinder (125), and the arm (127) (128) and the rear end of the pivot shaft (126) extending in the front-rear direction are provided. The control shaft (124) is connected through a link (129). A turning feeling member for fixing a turning arm (130) to the front end of the turning shaft (126) and changing the turning radius of the left and right traveling crawler (2) to be sensitive or insensitive to the turning angle of the steering handle (19). (131) is provided on the turning arm (130), and the turning rod (65) is connected to the turning arm (130) via the turning feeling member (131). Is fixed to the swivel arm (130) by a bolt (132) so that the position of the swivel arm (130) can be changed, and a detent pin (133) for fixing the swivel feeling member (131) is passed through the swivel arm (130). ) Is connected to the swivel rod (65), the connection length of the swivel rod (65) around the swivel axis (126) is switched, and the steering handle (19 Changing the steering pump (69) controlled variable for the switching angle, changing the pivoting feeling.

  Further, the steering pump (69) is controlled to increase / decrease speed and forward / reverse rotation by operating the steering handle (19) under the straight traveling condition, and the left / right traveling crawler (2) is driven at the same rotational speed in the reverse direction. (2) Rotate in the same direction while turning left or right, or perform a spin turn to turn left or right by reversing the turning inner traveling crawler (2), and the main transmission lever (24) The steering pump (69) is controlled to increase / decrease the output in proportion to the output of the transmission pump (67) by the operation, and when the vehicle speed is changed by the operation of the main transmission lever (24), the turning outer traveling crawler (2) and the turning inner traveling crawler ( The vehicle speed (aircraft center speed) is changed in a state where the speed ratio of 2) is kept substantially constant and the turning radius is kept substantially constant, similar to the accelerator pedal operation of a four-wheeled vehicle.

  As described above, in the crawler traveling vehicle in which the transmission pump (67) and motor (68), the steering pump (69), and the motor (70) of the hydraulic continuously variable transmission structure are attached to the transmission case (23), the steering motor ( 70) The connecting length of the swivel arm (130) for changing the output is configured to be freely changeable, and the steering motor (70) can be operated with respect to the operation amount of the steering handle (19) by changing the connecting length of the swivel arm (130). By changing the direction output amount, it is possible to obtain a sensitive or insensitive turning feeling in accordance with the working conditions of the work place or the operator, and to improve the driving operability and the working efficiency. ) Is attached to the turning feeling member (131), which is a connection length changing member, so that the position of the turning arm (130) can be adjusted. Times obtained by the mounting of the feeling switching structure pivoting feeling member (131), achieving such improvement in simplicity and switching function of turning feeling switching structure.

  Further, 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 provided on the opposite side surfaces of the transmission case (23). In addition, a straight arm (123) connected to the speed change control shaft (122) and a swing arm (130) connected to the steering control shaft (124) are provided on the same side surface of the transmission case (23) to change the speed and speed. The directional pumps (67) (69) and motors (68) (70) are provided on one side of the transmission case (23), and the input pulley (74) is installed on the other side. The pumps (67) (69) and motors (68) and (70) are arranged functionally in a compact manner, and the connection structure of the shift and steering control shafts (122) and (124) to the steering handle (19) and the shift lever (24) is simplified. Promote and improvement of assembling workability.

  Further, a vehicle speed rod (63) which is a vehicle speed operation final member for transmitting operations of both the steering handle (19) and the main speed change lever (24) and a turning rod (65) which is a steering operation final member are provided. The straight arm (123) is connected to (63), the swing arm (130) is connected to the swing rod (65), and the vehicle speed rod (63) and the swing rod (65) are connected to the straight and swing arm (123) (130). ) Can be connected and adjusted on the front side (same side surface) of the mission case (23), simplifying assembly work and improving handling operability such as maintenance, etc. The pumps (67) (69 ) And the motor (68) (70) are integrally installed, and the shift and steering control shafts (122) (124) are distributed to the front and rear surfaces of the hydraulic unit case (87). The swivel shaft (126) is provided so that a swivel shaft (126) that protrudes and is orthogonal to the axle shaft (90) is rotatably supported on the upper surface of the transmission case (23), and the rear end is connected to the steering control shaft (124). The pivot arm (130) is fixed to the front end, the straight arm (123) and the pivot arm (130) are arranged close to each other on the front side of the transmission case (23), and the connecting structure with the rod (63) (65) is provided. Simplification and easy assembly and maintenance work with the mowing part (8) removed are intended to improve handling operability.

  Further, as shown in FIGS. 10 and 14, a shift shaft (134) for switching the auxiliary transmission gears (93) and (94) to low speed, neutral and high speed is projected to the front side of the transmission case (23), and the shift shaft (134 ) Is fixed to the auxiliary transmission arm (135), and the auxiliary transmission lever (25) is connected to the auxiliary transmission arm (135) via the auxiliary transmission rod (136). The vehicle speed rod (63) and the turning rod ( 65) and the auxiliary speed change rod (136) are connected 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, a steering pump (69) and a steering motor (70) for steering are connected to a transmission case (23). In the crawler traveling vehicle attached to the gear pump (67), a space for installing the gear pump (79) is formed between the input pulley (74) for driving the pumps (67) (69) and the transmission case (23). An input pulley (74) is provided on the shaft (71), a gear pump (79) is provided on the pump shaft (77) of the steering pump (69), and an input belt (75) extending direction of the input pulley (74) The installation position of the gear pump (79) is not mutually limited, 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 Amplifier (79) and in close proximity on the same side of the transmission case (23) is arranged in a compact, reduced and reduction in size and weight as well as simplifying the transmission structure.

  Further, as shown in FIGS. 8, 17, and 19, the pump shafts (71) and (77) and motors (68) and (70) of the respective pumps (67) and (69) installed in the hydraulic unit case (66). The motor shafts (83) and (85) have different projecting lengths from the case (66), and the pump shafts (71) and (77) and the motor shafts (83 and 85) are splined in order from the longest. By combining the hydraulic unit case (66) with the transmission case (23), the assembly work is simplified. Further, 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 motor shaft (83) (85). By engaging and rotating a wrench with the hexagonal head of (137), the pump shafts (71) (77) and the motor shafts (83) (85) rotate, and the shafts (71) (77) ( 83) (85) can be operated to match the spline grooves of the opposing shafts (72) (78) (84) (86). The pumps (67) (69) and the motor (68) ) (70) The pump shaft (71) (77) of each pump (67) (69) or each motor (68) from the side opposite to the mounting surface of the transmission case (23) of the hydraulic unit case (66) in which the (70) is installed. (70) Motor shaft (83) 85) can be manually rotated, and the spline grooves can be adjusted by rotating the shafts (71) (77) (83) (85) by operating the plug (137), and the pump shafts (71) (77) or The spline fitting operation of each motor shaft (83) (85) can be easily performed, and the assembly work for combining the hydraulic unit case (66) with the transmission case (23) is simplified.

  Further, as shown in FIG. 7, the driving force of the engine (21) is transmitted to one pump shaft (71) of the gear shifting or steering pump (67) (69), and each pump (67) (69) The transmission shaft (71) (77) is connected to the gears (80), (81), and (82), and the engine (21) driving force is transmitted to the pumps (67) and (69) by belt transmission. ) Each pump (67) (69) is installed compactly in the upper part, and the simplification and miniaturization of the mounting structure of each pump (67) (69) and motor (68) (70) are achieved. 82), the gear pump (79) is connected to the pump shaft (77) of the steering pump (69) that transmits the driving force of the engine (21) through the input shaft 82, and the input pulley is connected to the pump shaft (71) of one transmission pump (67). (74) (21) The driving force is transmitted to the belt (75), the gear pump (79) is driven via the pump shaft (77) of the other steering pump (69), and the input pulley (749 and the gear pump (79) are driven. The drive structure and mounting structure of the gear pump (79) that can be installed close to the same side surface of the transmission case (23) and generates PTO hydraulic pressure are simplified and miniaturized.

  Further, as shown in FIG. 21, the pinion shaft (106) is connected to the carrier (103) 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 crawler (2). One end side is press-fitted and fixed, and the other end side of the pinion shaft (106) for supporting the planetary gear (105) on the rotation shaft is opposed to the side surface of the transmission final gear (99), and the pinion shaft ( The pinion shaft (106) abuts against the side surface of the transmission final gear (99) before the pinion is removed, and the pinion shaft (106) is prevented from being pulled out. ) Is pulled out, the drop-off of the pinion shaft (106) is prevented by the transmission final gear (99), and the inside of the transmission case (23) is damaged due to the pinion shaft (106) being pulled out. The transmission gear on the inner side (104) of the planetary gear mechanism (97) in the transmission case (23) and the transmission gear on the upper side can be prevented and also transmits the driving force for shifting and steering to the left and right traveling crawler (2). The auxiliary transmission gear (94) and the turning gear (108) are overlapped in side view, and the space required for installing the planetary gear mechanism (97), the auxiliary transmission gear (94), and the turning gear (108) is reduced to reduce the transmission case ( 23) to reduce size and weight.

  In addition, as shown in FIG. 13, the left and right gears (110) which are turning gears sandwiching 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 crawler (2). ) (111) The mechanism and the suction filter (117) are arranged at opposing positions, and the auxiliary transmission output shaft (96) and the turning final shaft (112) are provided on the circumferential surface of the ring gear (102) on the front side of the transmission case (23), A transmission case (23) 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 installed is compact. Compared to the above, the damage of the suction filter (117) is prevented and the cost is reduced by reducing the number of components.

  Further, as shown in FIG. 7 and FIG. 13, in the transmission case (23) shared for the turning gears (107) and (108) which are turning transmission mechanisms and for the auxiliary transmission gears (93) and (94) which are linear transmission mechanisms. The transmission motor shaft (83) and the steering motor shaft (85) are arranged at symmetrical positions around the auxiliary transmission input / output shafts (95) and (96) as the transmission shaft of the engine (21) or the transmission case ( 23) The structure of the machine structure such as the arrangement of 23) can be changed easily so that the gear change and steering motor shafts (83) and (85) can be interchanged, and the mission case (23) is shared by different models. In addition to reducing the manufacturing cost, the transmission pump shaft (71) is provided substantially directly above the transmission motor shaft (83), and the steering pump shaft (77) is provided substantially directly above the steering motor shaft (85). Transmission pump (67) and The motor (68), the steering pump (69), and the motor (70) are juxtaposed in the horizontal direction, and on the side opposite to the input pulley (74) and the belt (75) using the side surface of the transmission case (23). Install in a compact manner to simplify and compact the outer structure of the mission case (23).

  Further, a sub-transmission output shaft (96) that forms a transmission shaft shared for turning and linear transmission is provided substantially directly above the axle (90) in a side view, and a sub-transmission that forms a transmission shaft shared for both turning and linear transmission. The input shaft (95) is provided substantially immediately above the auxiliary transmission output shaft (96) in a side view, and the speed change motor shaft is located at a symmetrical position on the upward extension of a straight line connecting the centers of the shafts (90) (95) (96). (83) and the steering motor shaft (85) are arranged, the transmission structure from the speed change and steering motor shafts (83) (85) to the axle (90) is simplified and made compact, and the transmission case (23 ) To reduce size and weight.

  The present invention can be applied to, for example, a crawler traveling vehicle such as a combine, a tilling tractor, or a field management vehicle that continuously harvests and thresh cereal grains in a field.

(8) Mowing section (working section)
(23) Transmission case (67) Transmission pump (68) Transmission motor (69) Steering pump (70) Steering motors (93) (94) Sub-transmission gear (gear mechanism)
(95) Sub-transmission input shaft (transmission shaft)
(96) Sub-transmission output shaft (transmission shaft)
(107) (108) Swivel gear (gear mechanism)
(116) Lift valve (hydraulic valve)
(116a) Check valve for ascent

Claims (1)

In a crawler traveling vehicle including an engine provided on a machine base and a hydraulic unit case that outputs a traveling driving force from the engine to a left and right traveling crawler via a transmission case,
The input shaft protrudes from one side of the upper part of the mission case, and the input pulley is pivotally supported at the protruding end of the input shaft.
The hydraulic unit case is detachably arranged on the other side of the upper part of the mission case,
The upper part of the transmission case is sandwiched between the input pulley and the hydraulic unit case so as to be opposed to each other ,
In the hydraulic unit case, a linear shift pump and shift motor, and a turning steering pump and steering motor are built-in,
The shift motor is disposed directly below the shift pump, and the steering motor is disposed directly below the steering pump.
A pump shaft of the steering pump is connected to a pump shaft of the variable speed pump connected to the input shaft via a gear;
Furthermore, the control shaft of the shift pump is arranged on one side surface of the hydraulic unit case facing, and the control shaft of the steering pump is arranged on the other side surface,
A linear arm fixed to the control shaft of the transmission pump is arranged on one side of the transmission case,
A swivel arm connected to a control shaft of the steering pump via a link mechanism is provided on the same side surface of the transmission case where the straight arm is disposed, and the swivel arm is disposed close to the straight arm. A crawler traveling vehicle characterized by that.

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