JP2008175294A - Travel transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle travel transmission device for securing straight traveling performance and turning performance while actualizing ultra-pivotal brake turn to rotationally drive right and left travelling gears in mutually opposite directions. <P>SOLUTION: The travel transmission device comprises a differential mechanism 12 consisting of a pinion gear 9, a first driving gear 10 meshing with the pinion gear 9, and right and left output shafts 13, 14 to which distributed power is transmitted from the first driving gear 10. It has a right driving shaft 15 for transmitting power to the right travelling gear 3, a left driving shaft 16 for transmitting power to the left travelling gear 4, and a second driving gear 17 meshing with the pinion gear 9 so as to be rotationally driven in the opposite direction to the first driving gear 10. It also has a right first clutch 19 transmissive/interruptive between the right output shaft 13 and the right driving shaft 15, a right second clutch 21 transmissive/interruptive between the second driving gear 17 and the right driving shaft 15, a left first clutch 20 transmissive/interruptive between the left output shaft 14 and the left driving shaft 16, and a left second clutch 22 transmissive/interruptive between the first driving gear 10 and the left driving shaft 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a traveling transmission device in a four-wheel model or a working vehicle of a type equipped with right and left crawler traveling devices.

Since a work vehicle travels in a narrow work area, it is necessary to improve forward and reverse operation performance and turning performance.
In such a work vehicle, Patent Document 1 includes right and left hydrostatic continuously variable transmissions (20 in FIG. 2 of Patent Document 1) that can be operated forward and backward, and an engine (Patent Document 1). 2 is transmitted to the right wheel (2 in FIG. 2 of Patent Document 1) via the right hydrostatic continuously variable transmission, and the engine power is transmitted to the left hydrostatic type. It is configured to transmit to the left wheel (2 in FIG. 2 of Patent Document 1) via a continuously variable transmission. Thus, the right and left hydrostatic continuously variable transmissions can be moved forward and backward by operating them forward and backward, and the right and left hydrostatic continuously variable transmissions can be connected to each other. By operating in the reverse direction and driving the right and left wheels to rotate in the opposite directions, super turning can be performed.

In Patent Document 2, two bevel gears (3, 3 ′ in FIG. 2 of Patent Document 2) and two switching gears (Patent Document 2) are provided on the intermediate transmission shaft (2 in FIG. 2 of Patent Document 2). 5, 5 ′) of FIG. 2 and four engagement parts (7, 7 ′, 7 ″, 7 ′ ″ of FIG. 2 of Patent Document 2) are supported.
Thus, the switching gear (5 ′ in FIG. 2 of Patent Document 2) is engaged with the engagement portion (7 ′ ″ in FIG. 2 of Patent Document 2) in the state where the switching gear (5 ′ in FIG. 2 of Patent Document 2) is engaged. By engaging 5) in FIG. 2 with two engagement parts (7, 7 ′ in FIG. 2 of Patent Document 2), it is possible to advance and reverse. With the switching gear (5 ′ in FIG. 2 of Patent Document 2) engaged with the engagement portion (7 ″ in FIG. 2 of Patent Document 2), the switching gear (5 in FIG. 2 of Patent Document 2) is engaged. ) To the two engagement parts (7, 7 'in FIG. 2 of Patent Document 2), the right and left wheels can be driven to rotate in opposite directions, and the super turning Can be done.

JP 2005-1114064 A Japanese Utility Model Publication No. 52-14975

  In Patent Document 1, the right and left hydrostatic continuously variable transmissions are operated to the same shift position on the forward side or the reverse side, and the right and left wheels are driven at the same speed in the same direction to go straight. Become. However, even if the right and left hydrostatic continuously variable transmissions are operated to the same shift position on the forward or reverse side, there is a difference in speed between the right and left wheels due to the difference in load on the right and left wheels. As a result, the direction of the aircraft will gradually turn to the right or left, so the driver shifts the right and left hydrostatic continuously variable transmissions little by little in order to move the aircraft straight. It is necessary to operate so that the right and left wheels are always driven at the same speed.

  In Patent Document 2, the switching gear (Patent Document 2 5 ′ in FIG. 2) is engaged with the engaging portion (7 ′ ′ in FIG. 2 of Patent Document 2) and the switching gear (Patent Document 2). 2) of FIG. 2 is engaged with two engagement parts (7, 7 ′ of FIG. 2 of Patent Document 2), the power is transmitted from the drive bevel gear (4 of FIG. 2 of Patent Document 2). It is transmitted to the right and left wheels via two bevel gears (3, 3 ′ in FIG. 2 of Patent Document 2). As a result, the right and left wheels are driven in the same direction and at the same speed in any state. For example, when turning by a steering operation (turning with a turning radius larger than that of super-trust turning), the right and left If the wheels are driven at the same speed, it is difficult to make a smooth turn.

  The present invention relates to a turning performance (super turning that drives the right and left traveling devices to rotate in opposite directions to each other) in a traveling transmission device in a work vehicle of a four-wheel type or a type equipped with right and left crawler traveling devices. The purpose of the present invention is to ensure the turning performance of a turn having a larger turning radius than that of the straight turn and super turning while maintaining the above.

(Constitution)
The feature of the present invention resides in the following configuration in the traveling transmission device.
A differential mechanism is configured by including a pinion gear to which power is transmitted, a first drive gear engaged with the pinion gear, and right and left output shafts to which power distributed from the first drive gear is transmitted. The right drive shaft that transmits power to the right travel device, the left drive shaft that transmits power to the left travel device, and the first drive gear mesh with the pinion gear so that the first drive gear is rotated in the opposite direction. 2 drive gears. A right first clutch that can be transmitted and disconnected between the right output shaft and the right drive shaft, and a right second that can be transmitted and disconnected between one of the first or second drive gears and the right drive shaft. A clutch. Left first clutch that can be transmitted and disconnected between the left output shaft and the left drive shaft, and left second clutch that can be transmitted and disconnected between the other of the first or second drive gear and the left drive shaft. A clutch.

(Function)
In the features of the present invention, for example, as shown in the right half of FIG. 1, a differential mechanism 12 is configured by including a pinion gear 9, a first drive gear 10, right and left output shafts 13 and 14, and a right drive When the shaft 15, the left drive shaft 16, the second drive gear 17, the right first clutch 19, and the left first clutch 20 are provided, the right second clutch is interposed between the second drive gear 17 and the right drive shaft 15. 21 and the left second clutch 22 is provided between the first drive gear 10 (difference mechanism 12) and the left drive shaft 16.

According to the features of the present invention, for example, as shown in FIG. 2, the left first clutch 20 is in a transmission state, the left second clutch 22 is in a disconnected state, the right second clutch 21 is in a disconnected state, and the right first clutch 19 is transmitted. When operated to the state, the power of the pinion gear 9 is changed to the differential mechanism 12 (first drive gear 10) (the operating state of the differential mechanism 12), the right and left output shafts 13, 14, the right and left first clutches 19, 20, This is transmitted to the right and left traveling devices 3 and 4 via the right and left drive shafts 15 and 16.
In this case, since the power is transmitted to the right and left traveling devices 3 and 4 in the operating state of the differential mechanism 12, a speed difference occurs between the right and left traveling devices 3 and 4 with the change of the traveling direction of the airframe. Smooth turning.

According to the features of the present invention, for example, as shown in FIG. 3, the left first clutch 20 is in the transmission state, the left second clutch 22 is in the transmission state, the right second clutch 21 is in the disconnected state, and the right first clutch 19 is transmitted. When operated to the state, the power of the pinion gear 9 is changed to the differential mechanism 12 (first drive gear 10) (the differential mechanism 12 is in the differential lock state), the right and left output shafts 13 and 14, the right and left first clutches 19 and 20, This is transmitted to the right and left traveling devices 3 and 4 via the right and left drive shafts 15 and 16.
In this case, since the power is transmitted to the right and left traveling devices 3 and 4 with the differential mechanism 12 in the differential lock state, the right and left traveling devices 3 and 4 can be driven even if there is a difference in load. The traveling devices 3 and 4 are driven at the same speed, and it is unlikely that the traveling direction of the aircraft gradually turns to the right or left.

  According to the features of the present invention, for example, as shown in FIG. 4, the left first clutch 20 is disengaged, the left second clutch 22 is transmitted, the right second clutch 21 is transmitted, and the right first clutch 19 is disconnected. When the pinion gear 9 is driven to rotate in the state shown in FIG. 4, the power of the pinion gear 9 is changed to the first and second drive gears 10 and 17, the right and left second clutches 21 and 22, the right and left Are transmitted to the right and left traveling devices 3 and 4 through the drive shafts 15 and 16, the right traveling device 3 is rotationally driven by the arrow A1, and the left traveling device 4 is rotationally driven by the reverse arrow A1. Is done. In this way, the right and left traveling apparatuses 3 and 4 are rotationally driven in opposite directions to each other, so that super turning can be performed.

(The invention's effect)
According to a feature of the present invention, in a traveling transmission device in a work vehicle of a four-wheel type or a type equipped with right and left crawler traveling devices, a super-confidence by rotating the right and left traveling devices in opposite directions to each other. While being able to turn, smooth turning in the operating state of the differential mechanism, and straightness in the differential lock state of the differential mechanism can be ensured, and a traveling power transmission device having high traveling performance and functionality can be obtained. did it.

[1]
FIG. 1 shows a four-wheel drive type equipped with a right front wheel 1 and a left front wheel 2 (corresponding to a traveling device), a right rear wheel 3 and a left rear wheel 4 (corresponding to a traveling device) that can be steered. The transmission system of the agricultural tractor is shown, and the power of the engine 5 is transmitted to the hydrostatic continuously variable transmission 7 via the main clutch 6 and to the pinion gear 9 via the auxiliary transmission 8. The hydrostatic continuously variable transmission 7 has a neutral position and can be operated steplessly on the forward side and the reverse side. The auxiliary transmission 8 is configured as a multiple-stage gear transmission type.

  As shown in FIG. 1, in the right and left rear wheels 3, 4, a pinion gear 9, a first drive gear 10 meshing with the pinion gear 9, and a first drive gear 10 supported by a case portion of the first drive gear 10 A pair of differential pinion gears 11 that rotate freely while revolving integrally, a right output shaft 13 and a left output shaft 14, a side gear 13a that is fixed to the right output shaft 13 and meshes with the differential pinion gear 11, and a left output shaft 14 The differential mechanism 12 is configured by including a side gear 14 a and the like that are fixed to the differential pinion gear 11 and mesh with the differential pinion gear 11.

  As shown in FIG. 1, a right drive shaft 15 that transmits power to the right rear wheel 3, a left drive shaft 16 that transmits power to the left rear wheel 4, and a right output shaft 13 are relatively rotatable. A second drive gear 17 that is fitted and meshed with the pinion gear 9 is provided. As the pinion gear 9 is driven to rotate, the first and second drive gears 10 and 17 are driven to rotate in opposite directions.

  As shown in FIG. 1, transmission between the right output shaft 13 and the right drive shaft 15 and transmission between the right first clutch 19 and the second drive gear 17 and the right drive shaft 15 are possible. A right second clutch 21 that can be disconnected is provided, and the right first and second clutches 19 and 21 are configured as friction multi-plate type hydraulic clutches. The left first clutch 20 that can be transmitted and disconnected between the left output shaft 14 and the left drive shaft 16, and the left second clutch that can be transmitted and disconnected between the first drive gear 10 and the left drive shaft 16. 22, and the left first and second clutches 20, 22 are configured as frictional multi-plate hydraulic clutches. The right drive shaft 15 is provided with a friction multi-plate type right side brake 23, and the left drive shaft 16 is provided with a transmission clutch 18 (friction multi-plate type hydraulic clutch) and a friction multi-plate type left side brake 24. Is provided.

  A driving section (not shown) is provided with a steering handle (not shown), a main and auxiliary transmission lever (not shown), a clutch pedal (not shown), and right and left side brake pedals (not shown). ing. As a result, the right and left front wheels 1 and 2 can be steered by the steering handle, and the hydrostatic continuously variable transmission 7 can be operated by the main speed change lever. The device 8 can be operated. By depressing the clutch pedal, the main clutch 6 can be operated in the disconnected state, and by depressing the right side brake pedal, the right side brake 23 can be operated in the braking state, By depressing the left side brake pedal, the left side brake 24 can be operated in a braking state.

[2]
Next, the transmission system of the right and left front wheels 1 and 2 will be described.
As shown in FIG. 1, the right and left front wheels 1 and 2 are supported by a pinion gear 25, a first drive gear 26 that meshes with the pinion gear 25, and a case portion of the first drive gear 26 and integrated with the first drive gear 26. A pair of differential pinion gears 27 that rotate freely while revolving, a right output shaft 29 and a left output shaft 30, a side gear 29a that is fixed to the right output shaft 29 and meshes with the differential pinion gear 27, and a left output shaft 30 A differential mechanism 28 is configured by including a side gear 30 a and the like that are fixed and meshed with the differential pinion gear 27.

  As shown in FIG. 1, a right drive shaft 31 that transmits power to the right front wheel 1, a left drive shaft 32 that transmits power to the left front wheel 2, and a right output shaft 29 are externally fitted so as to be relatively rotatable. The second drive gear 33 that meshes with the pinion gear 25 is provided, and the first and second drive gears 26 and 33 are rotationally driven in directions opposite to each other as the pinion gear 25 is rotationally driven. The power of the pinion gear 9 is transmitted to the pinion gear 25 via the front wheel output clutch 39 and the front wheel output shaft 40, and the front wheel output clutch 39 is configured as a friction multi-plate hydraulic clutch.

  As shown in FIG. 1, transmission between the right output shaft 29 and the right drive shaft 31, and transmission between the right first clutch 35, the second drive gear 33 and the right drive shaft 31, are possible. A right second clutch 37 that can be disconnected is provided, and the right first and second clutches 35 and 37 are configured as frictional multi-plate hydraulic clutches. The left first clutch 36 that can be transmitted and disconnected between the left output shaft 30 and the left drive shaft 32, and the left second clutch that can be transmitted and disconnected between the first drive gear 26 and the left drive shaft 32 38, and the left first and second clutches 36, 38 are configured as friction multi-plate hydraulic clutches. A transmission clutch 34 (a frictional multi-plate hydraulic clutch) is provided on the left drive shaft 32.

  In the agricultural tractor of the present invention, the rear two-wheel drive state (diff operation) 2WD1, the rear two-wheel drive state (diff lock) 2WD2, the rear two-wheel drive state (turning state) 2WD3, the front two-wheel drive state (diff operation), front Two-wheel drive state (diff lock), front two-wheel drive state (turning state), four-wheel drive state (diff operation) 4WD1, four-wheel drive state (diff lock) 4WD2, four-wheel drive state (turning state) 4WD3, front two wheels The rear one-wheel drive state 3WD1 and the front one-wheel rear two-wheel drive state 3WD2 can be artificially set, and each state will be described as described in [3] to [8] below.

[3]
Next, the rear two-wheel drive state (diff operation) 2WD1 and the rear two-wheel drive state (diff lock) 2WD2 will be described.
As shown in FIGS. 1, 2, 3 and 12, in the rear two-wheel drive state (diff operation) 2WD1 and the rear two-wheel drive state (diff lock) 2WD2, the front wheel output clutch 39, the right first and second clutches 35, 37 The left first and second clutches 36 and 38 and the transmission clutch 34 are operated in the disconnected state.

  As shown in FIGS. 2 and 12, when the rear two-wheel drive state (differential operation) 2WD1 is set, the transmission clutch 18 is in the transmission state, the left first clutch 20 is in the transmission state, the left second clutch 22 is in the disconnected state, The second clutch 21 is operated in the disconnected state, and the right first clutch 19 is operated in the transmission state. As a result, as shown in FIG. 2, the power of the pinion gear 9 is such that the differential mechanism 12 (first drive gear 10) (the operating state of the differential mechanism 12), the right and left output shafts 13 and 14, the right and left first It is transmitted to the right and left rear wheels 3 and 4 via the clutches 19 and 20, the right and left drive shafts 15 and 16, and the transmission clutch 18.

  As shown in FIGS. 3 and 12, when the rear two-wheel drive state (diff lock) 2WD2 is set, the transmission clutch 18 is in the transmission state, the left first clutch 20 is in the transmission state, the left second clutch 22 is in the transmission state, The second clutch 21 is operated in the disconnected state and the right first clutch 19 is operated in the transmission state. As a result, as shown in FIG. 3, the power of the pinion gear 9 is such that the differential mechanism 12 (first drive gear 10) (the differential mechanism 12 is in the differential lock state), the right and left output shafts 13 and 14, the right and left first The clutches 19 and 20, the right and left drive shafts 15 and 16, and the transmission clutch 18 are transmitted to the right and left rear wheels 3 and 4.

[4]
Next, the rear two-wheel drive state (turning state) 2WD3 will be described.
As shown in FIGS. 1, 4 and 12, in the rear two-wheel drive state (turning state) 2WD3, the front wheel output clutch 39, the right first and second clutches 35 and 37, the left first and second clutches 36 and 38, The transmission clutch 34 is operated in the disconnected state.

  When the rear two-wheel drive state (turning state) 2WD3 is set, if the right and left front wheels 1 and 2 are steered within the range of the right and left set angles with the straight drive position in between (straight drive state) Or a state where the vehicle is turning gently), the rear two-wheel drive state (diff operation) 2WD1 or the rear two-wheel drive state (diff lock) 2WD2 described in the preceding item [3] is set.

  When the rear two-wheel drive state (turning state) 2WD3 is set and the right and left front wheels 1 and 2 are steered to the right beyond the range of the right and left set angles across the straight-ahead position 4 and 12, the transmission clutch 18 is in the transmission state, the left first clutch 20 is in the disconnected state, the left second clutch 22 is in the transmission state, the right second clutch 21 is in the transmission state, and the right first clutch 19. Is operated in the shut-off state, the operation position of the main transmission lever is ignored, and the forward side on which the hydrostatic continuously variable transmission 7 is set (the pinion gear 9 is rotationally driven by the arrow A1 in FIG. 4). It is operated to the position.

  As a result, as shown in FIG. 4, the power of the pinion gear 9 is such that the first and second drive gears 10 and 17, the right and left second clutches 21 and 22, the right and left drive shafts 15 and 16, and the transmission clutch 18. Is transmitted to the right and left rear wheels 3 and 4, the right rear wheel 3 is rotationally driven to the reverse side (arrow A 1), and the left rear wheel 4 is rotationally driven to the forward side (arrow A 1). It is possible to turn to the right.

  When the rear two-wheel drive state (turning state) 2WD3 is set and the right and left front wheels 1 and 2 are steered to the left beyond the range of the right and left set angles with the straight drive position in between. 4 and 12, the transmission clutch 18 is in the transmission state, the left first clutch 20 is in the disconnected state, the left second clutch 22 is in the transmission state, the right second clutch 21 is in the transmission state, and the right first clutch 19. Is operated in the shut-off state, the operation position of the main transmission lever is ignored, and the reverse side where the hydrostatic continuously variable transmission 7 is set (the pinion gear 9 is rotationally driven by the arrow A2 in FIG. 4). It is operated to the position.

  As a result, as shown in FIG. 4, the power of the pinion gear 9 is such that the first and second drive gears 10 and 17, the right and left second clutches 21 and 22, the right and left drive shafts 15 and 16, and the transmission clutch 18. Is transmitted to the right and left rear wheels 3 and 4, the right rear wheel 3 is driven to rotate forward (arrow A 2), and the left rear wheel 4 is driven to rotate backward (arrow A 2). It is possible to turn to the left.

  The rear two-wheel drive state (diff operation) 2WD1, the rear two-wheel drive state (diff lock) 2WD2, and the rear two-wheel drive state (turning state) 2WD3 described in [3] and [4] are shown in FIG. By setting the right first and second clutches 35 and 37, the left first and second clutches 36 and 38, and the transmission clutch 34 in the same manner, the front two-wheel drive state (diff operation) and the front two-wheel drive The state (diff lock) and the front two-wheel drive state (turning state) can be set. In this case, the front wheel output clutch 39 is operated to the transmission state, and the right first and second clutches 19 and 21, the left first and second clutches 20 and 22 and the transmission clutch 18 are operated to the disconnected state.

[5]
Next, the four-wheel drive state (diff operation) 4WD1 and the four-wheel drive state (diff lock) 4WD2 will be described.
As shown in FIGS. 1, 5, 6, and 13, in the four-wheel drive state (diff operation) 4WD1, the four-wheel drive state (diff lock) 4WD2, the front wheel output clutch 39 is operated to the transmission state.

  As shown in FIGS. 5 and 13, when the four-wheel drive state (differential operation) 4WD1 is set, the transmission clutches 18 and 34 are in the transmission state, the left first clutches 20 and 36 are in the transmission state, and the left second clutches 22 and 38 are in the transmission state. Is in the disconnected state, the right second clutches 21 and 37 are operated in the disconnected state, and the right first clutches 19 and 35 are operated in the transmission state. As a result, as shown in FIG. 5, the power of the pinion gears 9, 25 is applied to the differential mechanisms 12, 28 (first drive gears 10, 26) (the operating state of the differential mechanisms 12, 28), the right and left output shafts 13. , 14, 29, 30, right and left first clutches 19, 20, 35, 36, right and left drive shafts 15, 16, 31, 32, and transmission clutches 18, 34, and right and left front wheels 1 , 2, and right and left rear wheels 3, 4.

  As shown in FIGS. 6 and 13, when the four-wheel drive state (diff lock) 4WD2 is set, the transmission clutches 18 and 34 are in the transmission state, the left first clutches 20 and 36 are in the transmission state, and the left second clutches 22 and 38 are in the transmission state. In the transmission state, the right second clutches 21 and 37 are operated to be disconnected, and the right first clutches 19 and 35 are operated to the transmission state. As a result, as shown in FIG. 6, the power of the pinion gears 9, 25 is applied to the differential mechanisms 12, 28 (first drive gears 10, 26) (the diff lock state of the differential mechanisms 12, 28), the right and left output shafts 13. , 14, 29, 30, right and left first clutches 19, 20, 35, 36, right and left drive shafts 15, 16, 31, 32, and transmission clutches 18, 34, and right and left front wheels 1 , 2, and right and left rear wheels 3, 4.

  As shown in FIGS. 6 and 13, the differential mechanism 28 is operated while the differential mechanism 12 is maintained in the differential lock state (the transmission state of the left second clutch 22) in the state where the four-wheel drive state (diff lock) 4WD2 is set. You may comprise so that it can set to a state (the interruption | blocking state of the left 2nd clutch 38). Conversely, the differential mechanism 12 may be set to the operating state (disengaged state of the left second clutch 22) while maintaining the differential mechanism 28 in the differential lock state (transmission state of the left second clutch 38).

[6]
Next, the four-wheel drive state (turning state) 4WD3 will be described.
As shown in FIGS. 1, 7, and 13, in the four-wheel drive state (turning state) 4WD3, the front wheel output clutch 39 is operated to the transmission state.

  When the four-wheel drive state (turning state) 4WD3 is set, if the right and left front wheels 1 and 2 are steered within the range of the right and left set angles with the straight drive position in between (straight drive state or The four-wheel drive state (diff operation) 4WD1 or the four-wheel drive state (diff lock) 4WD2 described in the preceding item [5] is set.

  When the four-wheel drive state (turning state) 4WD3 is set and the right and left front wheels 1 and 2 are steered to the right beyond the range of the right and left set angles across the straight-ahead position. 7 and 13, the transmission clutches 18 and 34 are in a transmission state, the left first clutches 20 and 36 are in a disconnected state, the left second clutches 22 and 38 are in a transmission state, and the right second clutches 21 and 37 are in a transmission state. In the transmission state, the right first clutches 19 and 35 are operated in the disengaged state, the operation position of the main transmission lever is ignored, and the hydrostatic continuously variable transmission 7 is set on the forward side (pinion gears 9 and 25 Is rotated to the position indicated by arrow A1 in FIG.

  As a result, as shown in FIG. 7, the power of the pinion gears 9 and 25 is applied to the first and second drive gears 10, 17, 26, 33, the right and left second clutches 21, 22, 37, 38, the right and left Are transmitted to the right and left front wheels 1 and 2 and the right and left rear wheels 3 and 4 via the drive shafts 15, 16, 31 and 32 and the transmission clutches 18 and 34. 3 is driven to rotate backward (arrow A1), and the left front wheel 2 and rear wheel 4 are driven to rotate forward (arrow A1).

  When the four-wheel drive state (turning state) 4WD3 is set and the right and left front wheels 1 and 2 are steered to the left beyond the range of the right and left set angles across the straight drive position 7 and 13, the transmission clutches 18 and 34 are in a transmission state, the left first clutches 20 and 36 are in a disconnected state, the left second clutches 22 and 38 are in a transmission state, and the right second clutches 21 and 37 are in a transmission state. In the transmission state, the right first clutches 19 and 35 are operated in the disconnected state, the operation position of the main transmission lever is ignored, and the reverse side (pinion gears 9 and 25) in which the hydrostatic continuously variable transmission 7 is set. Is rotated to the position indicated by arrow A2 in FIG.

  As a result, as shown in FIG. 7, the power of the pinion gears 9 and 25 is applied to the first and second drive gears 10, 17, 26, 33, the right and left second clutches 21, 22, 37, 38, the right and left Are transmitted to the right and left front wheels 1 and 2 and the right and left rear wheels 3 and 4 via the drive shafts 15, 16, 31 and 32 and the transmission clutches 18 and 34. 3 is driven to rotate forward (arrow A2), and the left front wheel 2 and rear wheel 4 are driven to rotate backward (arrow A2).

  As shown in FIGS. 7 and 13, when the four-wheel drive state (turning state) 4WD3 is set, the right and left front wheels 1, 1 When 2 is steered to the right, the transmission clutch 18, the left second clutch 22, and the right second clutch 37 may be manipulated to a disconnected state. When operated in this way, the left front wheel 2 is rotationally driven forward (arrow A1), the right rear wheel 3 is rotationally driven backward (arrow A1), and the right front wheel 1 and left rear wheel 4 are rotated. Is in a free-rotation state without any power being transmitted, and can perform a super turn to the right.

  As shown in FIGS. 7 and 13, when the four-wheel drive state (turning state) 4WD3 is set, the right and left front wheels 1, 1 When 2 is steered to the left, the right second clutch 21, the transmission clutch 34, and the left second clutch 38 may be manipulated in a disconnected state. When operated in this way, the right front wheel 1 is rotationally driven forward (arrow A2), the left rear wheel 4 is rotationally driven backward (arrow A2), and the left front wheel 2 and right rear wheel 3 are driven. Is in a free-rotation state without any power being transmitted, and can perform a super turn to the left.

[7]
Next, the front two-wheel rear one-wheel drive state 3WD1 will be described.
When the front two-wheel rear one-wheel drive state 3WD1 is set, if the right and left front wheels 1 and 2 are steered within the range of the right and left set angles with the straight drive position in between (straight drive state or The vehicle is turning slowly), the rear two-wheel drive state (diff operation) 2WD1 described in the previous item [3], the rear two-wheel drive state (diff lock) 2WD2, and the front two-wheel drive state described in the previous item [4] ( Any one of a differential operation), a front two-wheel drive state (diff lock), and a four-wheel drive state (diff operation) 4WD1 and a four-wheel drive state (diff lock) 4WD2 described in [5] above is set.

  When the front two-wheel rear one-wheel drive state 3WD1 is set and the right and left front wheels 1 and 2 are steered to the right beyond the range of the right and left set angles across the straight-ahead position The front wheel output clutch 39 is operated to the transmission state. As shown in FIGS. 8 and 14 (3WD1 (R)), in the right and left front wheels 1 and 2, the transmission clutch 34 is in the transmission state, the left first clutch 36 is in the transmission state, and the left second clutch 38 is in the disconnected state. (Or the transmission state), the right second clutch 37 is operated in the disconnected state, and the right first clutch 35 is operated in the transmission state. In the right and left rear wheels 3 and 4, the transmission clutch 18 is in the transmission state, the left first clutch 20 is in the transmission state, the left second clutch 22 is in the transmission state, the right second clutch 21 is in the disconnected state, and the right first clutch 19. Is operated to shut off.

As a result, as shown in FIG. 8, the power of the pinion gear 25 is supplied to the differential mechanism 28 (first drive gear 26) (the differential mechanism 28 is in an operating state or differential lock state), the right and left output shafts 29 and 30, It is transmitted to the right and left front wheels 1 and 2 via the left first clutches 35 and 36, the right and left drive shafts 31 and 32, and the transmission clutch 34. The power of the pinion gear 9 is transmitted to the left rear wheel 4 through the first drive gear 10, the left first and second clutches 20, 22, the left drive shaft 16, and the transmission clutch 18, and the right The rear wheel 3 is in a free rotating state without transmitting power.
Therefore, the right and left front wheels 1 and 2 and the left rear wheel 4 are driven to rotate forward (arrow A1), and the right rear wheel 3 smoothly turns right without roughening the ground. Yes.

  When the front two-wheel rear one-wheel drive state 3WD1 is set and the right and left front wheels 1 and 2 are steered to the left beyond the range of the right and left set angles across the straight-ahead position The front wheel output clutch 39 is operated to the transmission state. As shown in FIGS. 9 and 14 (3WD1 (L)), the right and left front wheels 1 and 2 have the transmission clutch 34 in the transmission state, the left first clutch 36 in the transmission state, and the left second clutch 38 in the disconnected state. (Or the transmission state), the right second clutch 37 is operated in the disconnected state, and the right first clutch 35 is operated in the transmission state. In the right and left rear wheels 3 and 4, the transmission clutch 18 is disengaged, the left first clutch 20 is transmitted, the left second clutch 22 is transmitted, the right second clutch 21 is disconnected, and the right first clutch 19. Is operated in the transmission state.

As a result, as shown in FIG. 9, the power of the pinion gear 25 is changed so that the differential mechanism 28 (first drive gear 26) (the differential mechanism 28 is activated or differentially locked), the right and left output shafts 29 and 30, It is transmitted to the right and left front wheels 1 and 2 via the left first clutches 35 and 36, the right and left drive shafts 31 and 32, and the transmission clutch 34. The power of the pinion gear 9 is transmitted to the right rear wheel 3 through the first drive gear 10, the right output shaft 13, the right first clutch 19, and the right drive shaft 15, and the left rear wheel 4 Is in a free rotating state without power being transmitted.
Accordingly, the left and right front wheels 1 and 2 and the right rear wheel 3 are driven to rotate forward (arrow A1), and the left rear wheel 4 can smoothly turn left without roughening the ground. Yes.

[8]
Next, the front one-wheel rear two-wheel drive state 3WD2 will be described.
When the front 1-wheel 2-wheel drive state 3WD2 is set, if the right and left front wheels 1 and 2 are steered within the range of the right and left set angles with the straight drive position in between (straight drive state or The vehicle is turning slowly), the rear two-wheel drive state (diff operation) 2WD1 described in the previous item [3], the rear two-wheel drive state (diff lock) 2WD2, and the front two-wheel drive state described in the previous item [4] ( Any one of a differential operation), a front two-wheel drive state (diff lock), and a four-wheel drive state (diff operation) 4WD1 and a four-wheel drive state (diff lock) 4WD2 described in [5] above is set.

  When the front 1-wheel 2-wheel drive state 3WD2 is set, and the right and left front wheels 1 and 2 are steered to the right beyond the range of the right and left set angles across the straight-ahead position, The front wheel output clutch 39 is operated to the transmission state. As shown in FIGS. 10 and 15 (3WD2 (R)), in the right and left front wheels 1 and 2, the transmission clutch 34 is in the transmission state, the left first clutch 36 is in the transmission state, and the left second clutch 38 is in the transmission state. The right second clutch 37 is operated in the disconnected state, and the right first clutch 35 is operated in the disconnected state. In the right and left rear wheels 3 and 4, the transmission clutch 18 is in a transmission state, the left first clutch 20 is in a transmission state, the left second clutch 22 is in a disconnected state (or transmission state), and the right second clutch 21 is in a disconnected state. The right first clutch 19 is operated to the transmission state.

As a result, as shown in FIG. 10, the power of the pinion gear 25 is transmitted to the left front wheel 2 via the first drive gear 26, left first and second clutches 36, 38, left drive shaft 32, and transmission clutch 34. The right front wheel 1 is in a free rotating state without transmitting power. The power of the pinion gear 9 includes a differential mechanism 12 (first drive gear 10) (the differential mechanism 12 is in an operating state or differential lock state), right and left output shafts 13 and 14, right and left first clutches 19 and 20, right and It is transmitted to the right and left rear wheels 3 and 4 via the left drive shafts 15 and 16 and the transmission clutch 18.
Accordingly, the left front wheel 2, the right and left rear wheels 3 and 4 are rotationally driven forward (arrow A1), and the right front wheel 1 can smoothly turn right without roughening the ground. .

  When the front 1-wheel 2-wheel drive state 3WD2 is set and the right and left front wheels 1 and 2 are steered to the left beyond the range of the right and left set angles across the straight-ahead position, The front wheel output clutch 39 is operated to the transmission state. As shown in FIGS. 11 and 15 (3WD2 (L)), the right and left front wheels 1 and 2 have the transmission clutch 34 in the disconnected state, the left first clutch 36 in the transmission state, and the left second clutch 38 in the transmission state. The right second clutch 37 is operated in the disconnected state, and the right first clutch 35 is operated in the transmission state. In the right and left rear wheels 3 and 4, the transmission clutch 18 is in a transmission state, the left first clutch 20 is in a transmission state, the left second clutch 22 is in a disconnected state (or transmission state), and the right second clutch 21 is in a disconnected state. The right first clutch 19 is operated to the transmission state.

As a result, the power of the pinion gear 25 is transmitted to the right front wheel 1 via the first drive gear 26, the right output shaft 29, the right first clutch 35, and the right drive shaft 31, as shown in FIG. Therefore, the left front wheel 2 is in a freely rotating state without transmitting power. The power of the pinion gear 9 includes a differential mechanism 12 (first drive gear 10) (the differential mechanism 12 is in an operating state or differential lock state), right and left output shafts 13 and 14, right and left first clutches 19 and 20, right and It is transmitted to the right and left rear wheels 3 and 4 via the left drive shafts 15 and 16 and the transmission clutch 18.
Accordingly, the left front wheel 2 and the left and right rear wheels 3 and 4 are rotationally driven forward (arrow A1), and the left front wheel 2 can smoothly turn left without roughening the ground. .

  Rear two-wheel drive state (differential operation) 2WD1, rear two-wheel drive state (differential lock) 2WD2, rear two-wheel drive state (turning state) 2WD3, front two-wheel drive state (differential operation), front two-wheel drive State (Diflock), Front two-wheel drive state (turning state), Four-wheel drive state (Differential operation) 4WD1, Four-wheel drive state (Diflock) 4WD2, Four-wheel drive state (turning state) 4WD3, Two front wheels and one rear wheel In the driving state 3WD1 and the front one-wheel rear two-wheel driving state 3WD2, the right and left side brakes 23, 24 can be operated in the braking state by depressing the right and left side brake pedals.

[First Alternative Embodiment of the Invention]
In the aforementioned [Best Mode for Carrying Out the Invention], a pair of differential pinion gears 11 and 27 are supported on the case portions of the second drive gears 17 and 33 so as to freely rotate while revolving integrally, Differential pinion gears 11, 27, right output shafts 13, 29 and left output shafts 14, 30, side gears 13a, 29a fixed to right output shafts 13, 29 and meshing with differential pinion gear 11, left output shaft 14, The differential mechanisms 12 and 28 may be configured with side gears 14 a and 30 a that are fixed to 30 and mesh with the differential pinion gear 11.
In the above-mentioned [Best Mode for Carrying Out the Invention], the transmission clutches 18 and 34 may be provided on the right drive shafts 15 and 31, and the right and left side brakes 23 and 24 may be provided on the right side. In addition to the left rear wheels 3 and 4, the right and left front wheels 1 and 2 (right and left drive shafts 31 and 32) may be provided.

[Second Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment], the transmission system to the right and left front wheels 1 and 2 shown in FIG. A rear two-wheel drive type agricultural tractor in which power is transmitted only to the rear wheels 3 and 4 may be used.
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment], right and left crawler travel devices may be provided instead of the right and left rear wheels 3 and 4.
In the above-mentioned [Best Mode for Carrying Out the Invention] [First Alternative Embodiment], the right and left front wheels 1, 2 and the right and left rear wheels 3, 4 are eliminated, and the right and left You may comprise so that only this crawler travel device may be provided.

Overall view showing traditional system from engine to right and left front wheels, right and left rear wheels The figure which shows the transmission state to the right and left rear wheels in the rear two-wheel drive state (differential operation) 2WD1 The figure which shows the transmission state to the right and left rear wheel in the rear two-wheel drive state (diff lock) 2WD2 The figure which shows the transmission state to the right and left rear wheels in the rear two-wheel drive state (turning state) 2WD3 The figure which shows the transmission state to the right and left front wheels and the right and left rear wheels in the four-wheel drive state (difference operation) 4WD1 The figure which shows the transmission state to the right-and-left front wheel and the right-and-left rear wheel in four-wheel drive state (diff lock) 4WD2 The figure which shows the transmission state to the right and left front wheels and the right and left rear wheels in the four-wheel drive state (turning state) 4WD3 The figure which shows the transmission state to the right and left front wheel and the right and left rear wheel in the state in which the right and left front wheels are steered to the right in the front two-wheel rear one-wheel drive state 3WD1 The figure which shows the transmission state to the right and left front wheel and the right and left rear wheel in the state in which the right and left front wheels are steered to the left in the front two-wheel rear one-wheel drive state 3WD1 The figure which shows the transmission state to the right and left front wheel and the right and left rear wheel in the state where the right and left front wheels are steered to the right in the front 1-wheel 2-wheel drive state 3WD2 The figure which shows the transmission state to the right and left front wheel and the right and left rear wheel in the state where the right and left front wheels are steered to the left in the front 1-wheel 2-wheel drive state 3WD2 The figure which shows the transmission and interruption | blocking state in the rear two-wheel drive state (diff operation) 2WD1, the rear two-wheel drive state (diff lock) 2WD2, and the rear two-wheel drive state (turning state) 2WD3 The figure which shows the transmission and interruption | blocking state in 4 wheel drive state (diff operation) 4WD1, 4 wheel drive state (diff lock) 4WD2, 4 wheel drive state (turning state) 4WD3 The figure which shows the transmission and interruption | blocking state in front 2 wheel 1 wheel driving state 3WD1 The figure which shows the transmission and interruption | blocking state in front 1 wheel 2 wheel drive state 3WD2

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,3 Right travel apparatus 2,4 Left travel apparatus 9,25 Pinion gear 10,26 First drive gear 12,28 Differential mechanism 13,29 Right output shaft 14,30 Left output shaft 15,31 Right drive Axis 16, 32 Left drive shaft 17, 33 Second drive gear 19, 35 Right first clutch 20, 36 Left first clutch 21, 37 Right second clutch 22, 38 Left second clutch

Claims (1)

Comprising a pinion gear to which power is transmitted, a first drive gear meshing with the pinion gear, and right and left output shafts to which power distributed from the first drive gear is transmitted, constituting a differential mechanism;
The right drive shaft that transmits power to the right travel device, the left drive shaft that transmits power to the left travel device, and the first drive gear mesh with the pinion gear so as to be rotated in the opposite direction. A second drive gear,
A right first clutch that can be transmitted and disconnected between the right output shaft and the right drive shaft, and a right that can be transmitted and disconnected between one of the first or second drive gears and the right drive shaft. A second clutch,
The left first clutch that can be transmitted and disconnected between the left output shaft and the left drive shaft, and the left that can be transmitted and disconnected between the other of the first or second drive gear and the left drive shaft. A traveling transmission device comprising a second clutch.

Images