JP3930524B2 - Combine - Google Patents

Description

  The present invention relates to a combine.

Conventionally, there is a technique in which a left and right traveling crawler is installed, a steering operation tool is provided, a transmission case is provided for transmitting the driving force of the engine to the traveling crawler, and a differential mechanism including a planetary gear mechanism is provided in the transmission case ( For example, see Patent Document 1).
JP-A-8-156822

  Since the prior art differentials the left and right planetary gear mechanisms, it can smoothly change the output between straight and turning, but it turns by controlling the continuously variable transmission mechanism that transmits the driving force of the engine to the planetary gear mechanism. Since it is operated, there are problems such as simplification of the turning control structure and improvement in driving efficiency of the traveling crawler.

Therefore, in the present invention, the left and right traveling crawler (2) is installed, and the steering operation tool (19) is provided so as to be operable left and right, and the driving force of the engine (21) is applied to the traveling crawler (2). In a combine provided with a transmission case (22) for transmission, and provided with a differential mechanism (33) having left and right planetary gear mechanisms (35) on the transmission case (22), the transmission case (22) is a main transmission mechanism. A traveling hydraulic continuously variable transmission mechanism (25) for driving and a hydraulic continuously variable transmission mechanism (28) for turning that is a steering mechanism are provided. The traveling hydraulic continuously variable transmission mechanism (25) includes: The hydraulic continuously variable transmission mechanism (28) for turning comprises a hydraulic steering pump (26) and a hydraulic steering motor (27). ) The turning shaft (64) is linked to the output shaft (62) of the hydraulic steering motor (27), and the left and right turning gear (65b) is connected to the turning shaft (64) via the left and right clutches (151) and (152). (65a) is linked and the left and right planetary gear mechanisms (35) are linked and linked to the left and right turning gears (65b) and (65a), and the left and right turning gears (65b) and (65a) are connected to the left and right turning gears (65b) and (65a) . Left and right brakes (153) and (154) for braking the planetary gear mechanism (35) are provided, and the left and right clutches (151) and (152) and the brake (153) are used during straight traveling while the steering lever (19) is held neutral. ) (154) are turned on so that the left and right ring gears (38) of the planetary gear mechanism (35) are fixed stationary, and only the rotational output from the transmission motor (24) of the hydraulic continuously variable transmission mechanism (25) is obtained. Above It is straight running row crawler (2),
When the aircraft is turning with the steering lever (19) operated to the left and right, the left and right clutches (151) and (152) are turned on, and the left and right brakes (153) and (154) are turned off. The turning output of the steering motor (27) of the step transmission mechanism (28) is transmitted to the left and right ring gears (38), and a relative difference is generated in the driving speed of the left and right traveling crawler (2) so that the body is turned left and right. The present invention provides a combine that is characterized by the above.

In the present invention, the left and right traveling crawler (2) is installed, the steering operation tool (19) is provided so as to be operable left and right, and the driving force of the engine (21) is transmitted to the traveling crawler (2). In a combine provided with a case (22) and a differential mechanism (33) provided with the left and right planetary gear mechanisms (35) on the transmission case (22), the transmission case (22) is a main transmission mechanism. A hydraulic continuously variable transmission mechanism (25) for turning and a hydraulic continuously variable transmission mechanism (28) for turning which is a steering mechanism. The traveling hydraulic continuously variable transmission mechanism (25) is hydraulic It consists of a pair of a transmission pump (23) and a hydraulic transmission motor (24), and the turning hydraulic continuously variable transmission mechanism (28) includes a hydraulic steering pump (26) and a hydraulic steering motor (27). Consisting of a pair, The turning shaft (64) is linked and connected to the output shaft (62) of the pressure steering motor (27), and the left and right turning gears (65b) (65a) are connected to the turning shaft (64) via the left and right clutches (151) (152). ), The left and right planetary gear mechanisms (35) are linked to the left and right turning gears (65b) and (65a), and the left and right turning gears (65b) and (65a) are connected to the left and right planetary gears. Since the left and right brakes (153) and (154) for braking the mechanism (35) are provided, the clutches (151) and (152) and the brakes (153) and (154) on the inside of the turn are controlled while maintaining the straight driving force. The turning operation can be performed, and the turning control structure can be simplified and the driving efficiency of the traveling crawler (2) can be easily improved.
When the vehicle travels straight with the steering lever (19) held neutral, both the left and right clutches (151) (152) and the brakes (153) (154) are turned on, and the planetary gear mechanism (35) The left and right ring gears (38) are fixed stationary, and the traveling crawler (2) travels straight only by the rotational output from the transmission motor (24) of the hydraulic continuously variable transmission mechanism (25), and the steering lever (19) is moved. At the time of turning the aircraft by operating left and right, the left and right clutches (151) and (152) are turned on, and the left and right brakes (153) and (154) are turned off, so that the hydraulic continuously variable transmission mechanism (28) is turned on. The turning output of the steering motor (27) is transmitted to the left and right ring gears (38), and a relative difference is generated in the driving speed of the left and right traveling crawler (2), so that the body can be turned left and right.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view of a turning lever portion, FIG. 2 is an overall side view, and FIG. 3 is a plan view thereof. In the drawing, (1) is a track frame on which a traveling crawler (2) as a traveling portion is installed. ) Is a machine base installed on the track frame (1), (4) is a threshing section in which a feed chain (5) is stretched on the left side and a handling cylinder (6) and a processing cylinder (7) are built in (8) ) Is a cutting part including a cutting blade (9) and a grain transporting mechanism (10), (11) is a hydraulic lifting cylinder that lifts and lowers the cutting part (8) via a cutting frame (12), and (13) is a discharge cylinder. A waste disposal processing section facing the end of the straw chain (14), (15) a grain tank for carrying the grain from the threshing section (4) through the milled cylinder (16), and (17) the tank (15 ) The discharge auger that carries the grain out of the machine, (18) is equipped with a steering lever (19), a driver's seat (20), etc. That operating cabin, and configured to threshing harvests (21) the driver cabin (18) an engine provided below, continuously culms.

As shown in FIG. 4, the transmission case (22) for driving the traveling crawler (2) is a traveling hydraulic pressure that is a main transmission mechanism comprising a pair of a hydraulic transmission pump (23) and a hydraulic transmission motor (24) . A continuously variable transmission mechanism (25) and a hydraulic continuously variable transmission mechanism (28) for turning, which is a steering mechanism composed of a pair of a hydraulic steering pump (26) and a hydraulic steering motor (27), The driving force of the output shaft (21a) of the engine (21) is transmitted to the input shaft (29) of the speed change and steering pumps (23) and (26) via the counter case (30), and each pump (23). (26) is driven.

  The drive wheels (34), (34) of the left and right traveling crawlers (2), (2) are connected to the output shaft (31) of the transmission motor (24) via the auxiliary transmission mechanism (32) and the forced differential mechanism (33). The differential mechanism (33) has a pair of left and right planetary gear mechanisms (35) and (35), and the planetary gear mechanism (35) is connected to one sun gear (36). The planetary gears (37)... Meshed with the outer periphery of the sun gear (36) and the ring gears (38) meshed with the planetary gears (37).

  Further, each of the planetary gears (37) is rotatably supported by the carrier (41) of the carrier shaft (40) coaxial with the sun gear shaft (39), and the left and right sun gears (36) (36) are supported. The ring gear (38) has internal teeth (38a) meshing with the planetary gears (37), and the carrier shaft on the same axis as that of the sun gear shaft (39). (40) is rotatably supported.

  Furthermore, the traveling hydraulic continuously variable transmission mechanism (25) controls the forward / reverse rotation and the rotational speed of the transmission motor (24) by adjusting the angle of the rotary swash plate (23a) of the transmission pump (23). Therefore, the rotational output of the speed change motor (24) is transmitted from the transmission gear (42) of the output shaft (31) via the gears (43) (44) (45) and the auxiliary speed change mechanism (32) to the sun gear shaft (39). The sun gear (36) is rotated by being transmitted to the center gear (46) fixed to the center gear (46).

  The auxiliary transmission mechanism (32) includes an auxiliary transmission shaft (47) having the gear (45) and a parking brake shaft (49) having a gear (48) meshing with the center gear (46). A low speed gear (50) (48), a medium speed gear (51) (52), and a high speed gear (53) (54) are provided between the shaft (47) and the brake shaft (49), and the auxiliary gear at the center position is provided. The sub-shift is configured to be switched between a low speed, a medium speed, and a high speed by a sliding operation of the slider (51a) of the speed change gear (51). There is a neutral zone between the low speed and the medium speed and between the medium speed and the high speed.

  The parking brake shaft (49) is provided with a vehicle speed detection gear (55) and a vehicle speed sensor (56) for detecting the vehicle speed based on the number of rotations of the gear (55), and the rotational force is transmitted to the cutting part (8). The transmission gear (42) of the output shaft (31) is meshedly connected to the PTO input gear (58) of the cutting PTO shaft (57).

  Then, the driving force from the transmission motor (24) transmitted to the sun gear shaft (39) through the center gear (46) is transmitted to the left and right carrier shafts (40) (40) through the left and right planetary gear mechanisms (35) (35). 40), and the rotational output transmitted to each carrier shaft (40) (40) is driven left and right via a pair of left and right reduction gears (60), (61), (60), and (61). The wheels (34) and (34) are configured to transmit to the axles (34a) and (34a), respectively.

  In addition, the hydraulic continuously variable transmission mechanism (28) for turning is controlled by switching the forward / reverse rotation of the steering motor (27) and controlling the rotational speed by adjusting the angle of the rotary swash plate (26a) of the steering pump (26). Rotating from the output gear of the output shaft (62) of the steering motor (27) to the turning gears (65a) (65b) of the turning shaft (64) as the final output shaft through the gear transmission mechanism (63). The output is transmitted, the right turning gear (65a) is engaged with the external teeth (38b) of the right ring gear (38), and the reverse rotation shaft (66) is engaged with the external teeth (38b) of the left ring gear (38). The left turning gear (65b) is connected via the reverse rotation gear (67) of the left and right, the left and right ring gears (38) and (38) are rotated at the same left and right rotational speed when the steering motor (27) is rotated forward, and the left ring gear (38) is rotated forward and the right ring gear (38) is rotated backward. It is configured to so that.

  Thus, when the driving of the traveling motor (24) is stopped in a state where the driving of the steering motor (27) for turning is stopped and the left and right ring gears (38) are fixed stationary, the transmission motor (24 ) Is transmitted from the center gear (46) to the left and right sun gears (36) at the same rotational speed, and the planetary gear (37), the carrier (41) and the reduction gears (60) (61) of the left and right planetary gear mechanism (35). ) Is transmitted to the left and right axles (34a) and (34a) in the same rotational direction in the left and right and at the same rotational speed, and the aircraft is driven straight forward and backward. On the other hand, when the turning steering motor (27) is driven to rotate in the forward and reverse directions while the traveling speed changing motor (24) is stopped and the left and right sun gears (36) and (36) are stationary and fixed, The planetary gear mechanism (35) rotates forward or backward, and the right planetary gear mechanism (35) rotates backward or forward, causing one of the left and right traveling crawlers (2) and (2) to rotate forward and the other to rotate backward. The aircraft is configured to spin or turn on the spot to the left or right to change the direction at the field headland.

  In addition, when the steering motor (27) for driving is driven while driving the transmission motor (24) for driving, a difference occurs in the driving speed of the left and right driving crawlers (2) and (2), and the aircraft is turned left and right. The traveling direction is corrected by turning with a large turning radius, and the turning radius is determined according to the speed difference between the left and right traveling crawlers (2) and (2).

  As shown in FIGS. 5 to 13, the main transmission lever (68) connected to the traveling hydraulic continuously variable transmission mechanism (25) and the steering connected to the turning hydraulic continuously variable transmission mechanism (28). The lever (19) is linked to the shift and turn interlocking mechanism (69), and the interlocking mechanism (69) is traveled and steered via the link mechanisms (70) and (71) which are travel shifting and steering link systems. Are connected to the control levers (72) and (73) of the continuously variable transmission mechanism (25) and (28).

  The interlocking mechanism (69) includes a rotating plate (75) for supporting the base end bent portion (68a) of the main transmission lever (68) on the cylindrical shaft (74) so as to be swingable in the left-right direction, and the main body side machine. A fixed mounting plate (78) fixed to a frame (76) and supporting the rotating plate (75) through a first pivot (77) in the left-right direction so as to be able to pivot back and forth, and orthogonal to the pivot (77). A speed change operation member (80) which is connected to a rotary plate (75) via a second pivot (79) in the front-rear direction and is provided to be rotatable around the axis (79); and the second pivot (79) And a steering operation member (81) that is pivotably connected around the axis of the second pivot (79) of the speed change and steering operation members (80) (81). 80a) (81a) are interlockingly connected to the shifting and steering link mechanisms (70) (71).

  The shift and steering link mechanisms (70) (71) are supported on the frame (76) side of the machine mechanism (69) via the swinging cylinder shaft (83) outside the swinging shaft (82) at the rear position of the interlocking mechanism (69). A transmission arm (84), a steering arm (85) having a base end fixed to the swing shaft (82), and each operation output shaft (86) (87) of the output sections (80a) (81a) Universal joint shafts (88) and (89) for connecting the arms (84) and (85), a steering output arm (90) fixed to the right end of the swing shaft (82), and the operating cabin (18) ) And the first swing arm (95) (96) for shifting and steering provided on the intermediate shaft (94) attached to the fulcrum bearing (93) of the pivot fulcrum shaft (92), and the arm (84) (90) and the first swing arm (95) (96) and the respective ends of the first swing arm (95) and (96), respectively Joint-type first rods (97) (98) and a second swing arm (99) for shifting and steering that is provided on the intermediate shaft (94) and is integrally connected to the first swing arm (95) (96). (100), a shift and steering cylinder shaft (103) (104) rotatably supported by a support shaft (102) attached to the bearing plate (101) on the transmission case (22), and the cylinder shaft (103) (104) The first swing arm (105) (106) having a base end fixed to the distal end of the second swing arm (99) (100) is freely connected for shifting and steering. Joint-type second rods (107) (108), second swinging arms (109) (110) having base ends fixed to the cylindrical shafts (103) (104), and the control levers (72) (73) Universal joint-type third rod for shifting and steering (1 1) (112) and a control lever (72) for traveling by turning of the speed change operation member (80) about the first pivot (77), and a second pivot (79) during traveling The steering control lever (73) is operated by rotating the steering operation member (81) centering on the gears, thereby performing speed change and steering control.

  On the other hand, a gear (114) is provided on the turning operation shaft (113) at the lower end of the steering lever (19), and the gear (114) is engaged with a sector gear (116) attached to the rear rotation shaft (115). A first swing arm (118) of a steering shaft (117) disposed below the position of the main transmission lever (68), and an output arm (119) having a base end fixed to the rotating shaft (115). Each tip is connected via a universal joint type steering first rod (120), and the second swing arm (121) integrated with the first swing arm (118) of the steering shaft (117) A steering operation member is connected to the front end of the universal joint shaft (89) via a universal joint-type steering second rod (122), and the lever (19) is tilted left and right about the second pivot (79). (81) is configured to rotate.

  A neutral positioning plate (123) is provided below the gear (114) of the turning operation shaft (113), and one end of the steering detection link (125) is connected to the protruding shaft (124) on the lower surface of the positioning plate (123). The first swing arm (127) of the reduction arm shaft (126) disposed on the right side of the rotation shaft (115) and the long hole (125a) at the other end of the detection link (125) are connected to the shaft (128). And a universal joint type first reduction rod (131) between the tips of the reduction arm (129) of the steering shaft (117) and the second swing arm (130) of the reduction arm shaft (126). And the rightmost speed reduction transmission shaft (132) of the speed change operation member (80) and the other end of the second swing arm (130) are connected by a universal joint type second speed reduction rod (133) to travel. Left and right operation of the lever (19) in the state As the operation amount is increased, the first swing arm (127) is rotated in the same direction in the range of the angle (θ) in both the left and right turns, and the second deceleration rod (133) is pulled downward to steer. The traveling speed is reduced in proportion to the operation amount.

  Thus, as shown in FIG. 13, the second pivot (79) for pivotally supporting the shift and steering operation members (80) (81) around the axis and the joint shaft connected to the steering arm (85). The universal joint shaft (88) (89) is connected to the operation output shaft (86) (87) by positioning the universal joint portion (89a) of (89) on the horizontal line (L1) in the front-rear direction. The joint shaft (88b) (89b) and the first pivot (77) are positioned on the left and right horizontal line (L2) perpendicular to the line (L1), and are further coupled to the speed change arm (84) ( 88) and the universal joint portion (88a) and the joint portion (89a) are positioned on the horizontal horizontal line (L3) parallel to the line (L2), and the joint portion (89a) is provided with the joint portion (88a). Place as close as possible (closest position), When the transmission lever (68) and the steering lever (19) are supported at the neutral position, each of the operation members (80) (81) can be operated even if either the lever (68) or (19) is operated. The lever (68) or (19) is not applied to the joint shafts (88) and (89) only by rotating the first and second pivots (77) and (79). ing.

  9 and 13, when the main transmission lever (68) is operated to move forward and backward, and the operating member (80) is tilted back and forth by an angle (α1) (α2) about the first pivot (77), The transmission shaft (84) is operated by pulling or pushing the joint shaft (88) to switch the traveling speed forward and backward, and the main transmission lever (68) is operated to a position other than neutral as shown in FIG. In this state, when the steering lever (19) is tilted and the operating member (81) is tilted up and down by an angle (β1) (β2) about the second pivot (79), the joint shaft (89) is pulled or pushed. The steering arm (85) is operated to perform a steering operation to turn the aircraft to the left and right. Even if the turning operation is performed when the main transmission lever (68) is neutral, the joint (89a) is supported as a fulcrum. The joint shaft (89) is line (L1 The joint part (89b) moves on the same circumference centered at the intersection of the line (L1) and the shaft (77), and the joint part (89b) and the line (L3 ) Is kept substantially constant, so the steering arm (85) does not operate.

  In addition, when the lever (19) is turned when the main transmission lever (68) is not in the neutral position, the steering arm (85) operates, and when switching to the forward / reverse movement, the steering arm (85 ) Operates in the reverse direction, and the steering motor (27) is configured to rotate in the reverse direction during forward and reverse travel.

  For example, assuming that the forward speed of the traveling speed change motor (24) is forward, the planetary gear mechanism (35) is operated by the turning steering motor (27) when moving backward and reverse. In order to match the turning direction of the airframe by operating the lever (19) during forward movement and reverse movement, the swash plate angle of the steering pump (26) is reversed during reverse rotation (reverse movement) of the transmission motor (24). The steering motor (27) is configured to rotate in the reverse direction during forward and reverse travel.

  Further, the operation member (80) at the time of forward operation is tilted to the forward angle (α1) side from the neutral position, and the second rod (122) is pulled by the right tilt operation of the lever (19), and the operation member (81) is moved downward. By tilting toward the angle (β2) side, the output portion (81a) of the operating member (81) is brought closer to the steering arm (85) side, and the steering arm (85) is moved around the swing shaft (82). Rotate in a direction away from (81) (counterclockwise in FIG. 6), rotate the control lever (73) downward via the first and second rods (98), (108), etc. The direction motor (27) is rotated forward. That is, the aircraft is configured to turn right (the speed of the traveling crawler (2) is large on the left side and small on the right side) by moving forward.

  Further, at the time of forward operation in which the main transmission lever (68) is moved forward, the second rod (122) is pushed up by the left tilt operation of the lever (19), and the operation member (81) is tilted to the upward angle (β1) side. Accordingly, the output portion (81a) of the operating member (81) is moved away from the operating arm (85) side, and the steering arm (85) is moved closer to the operating member (81) side around the swing shaft (82) ( The control lever (73) is rotated upward and the steering motor (27) is rotated in the reverse direction. That is, it is configured to turn the aircraft forward (turn the speed of the traveling crawler (2) large on the right side and small on the left side).

  Further, the operation member (80) is tilted to the rear angle (α2) side from the neutral position by the backward operation of tilting the main transmission lever (68) backward, and the second rod (122) is pulled by the right tilt operation of the lever (19). By tilting the operating member (81) to the downward angle (β2) side, the output part (81a) of the operating member (81) is moved away from the steering arm (85) side, and the swing shaft (82) is the center. The steering arm (85) is rotated in the direction approaching the operation member (81) (clockwise in FIG. 6), the control lever (73) is rotated upward, and the steering motor (27) is reversely rotated. Let In other words, the vehicle is configured to turn backward (turn the crawler (2) at a higher speed on the left side and lower on the right side).

  In addition, when the main transmission lever (68) is operated backward, the operation member (81) is tilted to the upward angle (β1) side by the left tilting operation of the lever (19), whereby the output portion of the operation member (81). (81a) is moved closer to the operating member (81) side, and the steering arm (85) is rotated in the direction away from the operating member (81) (counterclockwise in FIG. 6) about the swing shaft (82). The control lever (73) is rotated downward, and the steering motor (27) is rotated forward. That is, the aircraft is configured to turn backward (turn the crawler (2) at a higher speed on the right side and lower on the left side).

  In this way, the steering arm (85) is rotated in the reverse direction during the forward and backward turning operations, and the tilting operation direction of the steering lever (19) and the turning direction of the aircraft coincide with each other in the forward and backward movements. It is configured to make it.

  As shown also in FIG. 14, the steering lever (19) turns the machine body in the left-right direction by a tilting operation in the left-right direction, and lifts and lowers the cutting part (8) by a tilting operation in the front-rear direction. (113) via a pair of bevel gears (134) and (135), the left and right swing shaft (136) is connected to the swing shaft (136), switch base (137), front and rear swing shaft (138), lever base ( 139), the steering lever (19) is connected to be swingable back and forth and left and right.

  The left / right swing shaft (136) is pivotally supported by a side plate L-shaped mounting plate (141) at the upper end of a steering column (140) for inserting the operation shaft (113), and has a substantially semicircular large-diameter bevel gear. (135) and a L-shaped switch base (137) in plan view are fixed to the swing shaft (136), and a lever base (139) is mounted on the front and rear swing shaft (138) that is rotatably attached to the switch base (137). It is fixed. And, the lowering and raising switches (142) and (143) for operating the raising and lowering valves of the raising and lowering cylinder (11) are fixed to the outer surface of the switch base (137), and the switches (142) and (143) are provided. The switch operation plate (144) that is turned on / off is fixed to the front / rear swing shaft (138), and the switch (142) (143) is turned on / off by the forward or rearward tilting of the steering lever (19) for cutting. The part (8) is moved up or down, and the lever (19) is tilted to the left or right to rotate the operation shaft (113) forward and backward to turn the body left or right. Further, the knob (19a) of the lever (19) is provided with an operation piece (145) for fine adjustment of the turning direction so that the turning direction can be finely adjusted at the time of alignment by tilting right and left with the fingertip. is doing.

  By the way, as shown in FIG. 1, the steering output of the output shaft (62) of the hydraulic steering motor (27) is sent to the steering reduction shaft (148) via a pair of reduction gears (146) (147), and The rotational output of the reduction shaft (148) is transmitted to the turning shaft (64) through a pair of reduction gears (149) and (150), respectively, and the left and right turning gears (65b) (65a) and the turning shaft (64). A multi-plate type left and right clutch (151) (152) and a brake (153) (154) are interposed between them.

  The left and right clutches (151) and (152) are integrally connected to the respective turning gears (65b) (65a) and the turning shaft (64) by turning on the left and right clutch operating mechanisms (155) and (156) such as electromagnetic hydraulically operated valves. At the same time, the left and right brakes (153) and (154) are turned on by the left and right brake operating mechanisms (157) and (158) such as electromagnetic hydraulically operated valves so that the left and right turning gears (65b) and (65a) are moved to the transmission case (22) It is configured to be fixed stationary.

  Then, as shown in FIG. 15, a minute left / right turning detection switch (145a) (145b) of the operation piece (145), a neutrality (straight forward) of the steering lever (19), a straight sensor (159), and a steering A turning sensor (160) for detecting a left and right turning operation of the lever (19) is connected to the steering controller (161), and the clutch and brake operating mechanisms (155) (156), (157) (158) are connected to the controller. (161) is connected, and the operation control of the clutch (151) (152) and the brake (153) (154) is performed by operating the steering lever (19) and the operation piece (145). .

  As is apparent from the above, the left and right traveling crawler (2) is installed, the steering lever (19) as a steering operation tool is provided, and the driving force of the engine (21) is transmitted to the traveling crawler (2). In a combine provided with a case (22) and a differential mechanism (33) provided with a planetary gear mechanism (35) in the transmission case (22), a left and right clutch (151) for transmitting driving force to the left and right planetary gear mechanisms (35) ) (152) is provided, and while the straight drive force is maintained, the turning operation is performed by controlling the clutches (151) and (152) inside the turning, thereby simplifying the turning control structure and improving the driving efficiency of the traveling crawler (2). At the same time, left and right brakes (153) and (154) for braking the left and right planetary gear mechanisms (35) are provided to maintain, for example, a clutch (15 ) (152) controls the turning outer brake (153) (154) controlled by the pivoted operation performs simplification of the turning control structure and to improve the turning function.

  Also, a center gear (46) that transmits driving force to the sun gear (36) of the left and right planetary gear mechanisms (35), and a left and right clutch (151) that transmits driving force to the ring gears (38) of the left and right planetary gear mechanisms (35). (152) and left and right brakes (153) and (154) for braking each ring gear (38) are provided in the mission case (22) so that the complicated hydraulic control as in the prior art is unnecessary, and the clutch (151) (152) and the brakes (153) and (154) are smoothly turned by a simple operation to simplify the turning control structure and improve the driving efficiency of the traveling crawler (2).

  Further, as shown in FIG. 18, the steering lever (19) is formed to be exchangeable with a round steering handle (162), and an operation piece (145) is provided on the right side of the round steering handle (162). Is provided so that the operation piece (145) can be operated by the fingertip in a state where the round steering handle (162) is gripped by the hand.

  In this embodiment, as described above, as shown in FIGS. 16 and 17, the left and right clutches (151) (152) and brake ( 153) (154) are both turned on, the left and right ring gears (38) are stationary and fixed, and the traveling crawler (2) travels straight only by the rotational output from the transmission motor (24).

  Further, when turning the aircraft with the steering lever (19) tilted left and right, the left and right clutches (151) and (152) are turned on and the left and right brakes (153) and (154) are turned off, and the steering motor (27) Is transmitted to the left and right ring gears (38) to cause a relative difference in the driving speeds of the left and right traveling crawlers (2) and (2), thereby turning the aircraft to the left and right.

  Further, at the neutral position of the steering lever (19), when the left turn detection switch (145a) is turned on by the left tilt of the operation piece (145), the left clutch (151) and the brake (153) are turned on during the fitting left turn operation. The left ring gear (38) is freely rotated by turning it off, while the right clutch (152) is turned on or off, the right brake (154) is turned on, the right ring gear (38) is fixedly stationary, and the right crawler ( Only the 2) is driven with the same rotational force as the straight traveling, and the aircraft is slightly turned leftward.

  Further, during the fitting right turning operation in which the right turning detection switch (145b) is turned on by the right tilting of the operation piece (145) at the neutral position of the steering lever (19), the right clutch (152) and the right brake (154) are turned on. ) To turn off the right ring gear (38), while turning the right clutch (151) on or off, and turning on the left brake (153) to fix the left ring gear (38) to the left. Only the crawler (2) is driven with the same rotational force as that of the straight traveling, and the aircraft is slightly turned rightward.

  Thus, when the left and right turning operation is performed by the operation piece (145), the left and right ring gears (38) are operated by the left and right clutches (151) (152) and the brakes (153) (154) regardless of the turning output of the steering motor (27). Is controlled so that the traveling crawler (2) on the turning side is in a freely rotating state, and the traveling crawler (2) on the other side is driven with the same rotational force as the straight traveling to correct the course of the aircraft to the left and right. is there.

  Further, when the right and left clutches (152) and (151) are turned on during straight traveling or when the right and left brakes (154) and (153) are turned on by turning the operation piece (145) left and right, the steering motor (27) A brake (153) (154) force acts on the output shaft (62) of the motor, and no separate shaft brake is required, and the output shaft (62) of the steering motor (27) can be stopped and maintained. .

Explanatory drawing of the turning part of a mission drive system. The whole side view of a combine. The whole top view of a combine. Explanatory drawing of a mission drive system. The perspective explanatory drawing of the operation system of a main gearshift lever and a steering lever. Side surface explanatory drawing of driving | running | working transmission and a steering operation part. Front explanatory drawing of an operation part. Plane explanatory drawing of an operation part. Side surface explanatory drawing of an operation member. Front explanatory drawing of an operation member. Plane explanatory drawing of an operation member. Plane explanatory drawing of a turning operation shaft part. Plane explanatory drawing of a link mechanism part. Explanatory drawing of the back of a steering lever part. Steering control circuit diagram. flowchart. Steering control table. Installation explanatory drawing of a round steering handle.

Explanation of symbols

(2) Traveling crawler (19) Steering lever (steering tool)
(21) Engine (22) Mission case (33) Differential mechanism (35) Planetary gear mechanism (36) Sun gear (38) Ring gear (46) Center gear (151) (152) Clutch (153) (154) Brake

Claims (1)

The left and right traveling crawler (2) is installed, the steering operation tool (19) is installed so as to be operable left and right, and the driving case of the engine (21) is transmitted to the traveling crawler (2) (22). In the combine provided with the differential mechanism (33) including the left and right planetary gear mechanisms (35) in the transmission case (22),
The transmission case (22) includes a traveling hydraulic continuously variable transmission mechanism (25) as a main transmission mechanism and a turning hydraulic continuously variable transmission mechanism (28) as a steering mechanism.
The traveling hydraulic continuously variable transmission mechanism (25) includes a pair of a hydraulic transmission pump (23) and a hydraulic transmission motor (24), and the turning hydraulic continuously variable transmission mechanism (28) includes: It consists of a pair of a hydraulic steering pump (26) and a hydraulic steering motor (27),
The turning shaft (64) is interlocked and connected to the output shaft (62) of the hydraulic steering motor (27), and the turning shaft (64) is connected to the left and right turning gears (65b) via the left and right clutches (151) and (152). 65a) and the left and right turning gears (65b) (65a) are connected to the left and right planetary gear mechanisms (35), and the left and right turning gears (65b) and (65a) are connected to the left and right planetary gear mechanisms (65a) and 65a. Left and right brakes (153) and (154) for braking the gear mechanism (35) are provided,
During straight running with the steering lever (19) held neutral, both the left and right clutches (151) (152) and the brakes (153) (154) are turned on so that the left and right ring gears of the planetary gear mechanism (35) are turned on. (38) is fixed stationary, and the traveling crawler (2) travels straight by only the rotational output from the transmission motor (24) of the hydraulic continuously variable transmission mechanism (25),
When the aircraft is turning with the steering lever (19) operated to the left and right, the left and right clutches (151) and (152) are turned on, and the left and right brakes (153) and (154) are turned off. The turning output of the steering motor (27) of the step transmission mechanism (28) is transmitted to the left and right ring gears (38), and a relative difference is generated in the driving speed of the left and right traveling crawler (2) so that the body is turned left and right. Combine that is characterized by that.

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