JP5061499B2 - Front mower - Google Patents

Description

  It is related to the tractor suitable for the work mode in which the work machine is mounted on the front side of the vehicle body like the front mower and the transmission device of the tractor, and lowers the floor and shortens the transmission case for driving the front wheels. To make it easier to install and install the work equipment.

The HST which arranges a pump shaft and a motor shaft in the front and rear of the HST case is provided with a front and rear transmission gear shaft, and a technology for interlocking with the differential gear of the axle housing. Further, the transmission gear shaft, A technique for providing a rear PTO shaft below a shaft or the like is known (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-262258 (second page, FIGS. 1 and 4).

  In a tractor in which a work machine is mounted on the front side of the vehicle body and an engine is mounted on the rear side like a front mower, the front side wheels are driven from the rear side engine to drive. Therefore, the longitudinal length of the vehicle body becomes long, the front wheel side vehicle height tends to be high, the working machine is easily mounted and mounted, and the steering operability is lowered.

According to the first aspect of the present invention, a step floor (19) is provided at the front of the seat floor (18) that supports the driver's seat (17), a steering handle (20) is provided at the step floor (19), and the seat A configuration in which a pair of left and right front wheels (22) is disposed below the floor (18), an engine (23) is mounted behind the seat floor (18), and an upper portion of the engine (23) is covered with a bonnet (24). A collector (25) is mounted on the upper side of the bonnet (24), and a mower deck (26) is provided below the seat floor (18). From the mower deck (26), a chute (27), a blower (28) and a blower are provided. The HST case (3) is configured to accommodate the grass (turf grass) cut and conveyed through the collector 29 in the collector (25), and the HST pump shaft (1) and motor shaft (2) are arranged on the left and right. A center case (7) at the center of an axle housing (6) having a differential shaft (4) and a differential gear (5) is connected to the front side. The center case (7) is connected to the motor shaft (2). bevel gear (8), and configured to mesh with the (9) laterally of the brake shaft which is interlocked via (10) to JikuSo, said front differential gear from the brake shaft (10) (5), a pump shaft (1 ) Is transmitted to the input shaft (55) on the mower deck (26) side through the interlocking shaft (56) from the PTO interlocking shaft (15) extending forward along the pump shaft core. The shaft (55) is located on the mower deck (26) and is deviated to the right side in the mower deck (26) , and the blower (28) and the lower (29) are provided immediately after the driver seat (17), and the HST Case (3) The axle housing (6) is disposed below the driver's seat (17), and the chute (27) is connected to the pair of left and right front wheels (from the rear lateral central portion of the mower deck 26). 22) The front mower has a configuration in which it is inclined and communicated to the suction port of the blower (28) at the upper rear portion through the central portion between the two and the axle housing (6) .

  In the first aspect of the invention, the HST pump shaft 1 and the motor shaft 2 are arranged side by side, and the center case 7 portion of the center portion of the axle housing 6 is directly connected to the front side of the HST case 3. In addition, since the lateral brake shaft 10 is disposed between the motor shaft 2 and the differential gear 5 in the center case 7, the length of the entire transmission case can be reduced. it can. Further, since the pump shaft 1, the motor shaft 2, the brake shaft 10, the differential shaft 4 and the like are arranged in a plane so as to be arranged along substantially the same plane, the height and thickness of the transmission case portion are reduced. Can be made thin.

Also, a blower (28) and a lower (29) are provided immediately after the driver seat (17),
The HST case (3) is disposed below the blower (28), the axle housing (6) is disposed below the driver's seat (17), and the chute (27) is located at the center of the rear side of the mower deck 26 in the lateral direction. The structure of the chute 27 is configured such that the communication is inclined from the center of the pair of left and right front wheels (22) and on the axle housing (6) toward the suction port of the rear upper blower (28). It is simple and easy, and the cut grass is transported smoothly.

  Further, the driver's seat 17 and the like can be lowered. Further, by lowering and shortening the positions of the HST case 3 and the axle housing 6 and the like, the distance from the rear engine 23 and the rear wheel 30 can be set short. The arrangement height of the arranged blower 28, the transmission mechanism for transmitting the blower 28, and the like can be reduced.

  Based on the illustrated example, the tractor vehicle body is provided with a step floor 19 at the front portion of the seat floor 18 that supports the driver's seat 17, and the post 21 of the steering handle 20 is supported at the front portion. A pair of left and right front wheels 22 are disposed below. An engine 23 is mounted behind the seat floor 18 and covered with a bonnet 24 to form an engine room. A collector 25 is mounted on the upper side of the bonnet 24 and accommodates turf grass that is cut and conveyed from the front mounted mower deck 26 via a chute 27, blower 28, and a lower 29. Below the engine 23, left and right rear wheels 30 that are steered by the handle 20 are disposed. The lower 28 and the lower 29 for guiding the turf grass blown up from the blower 28 are provided immediately behind the driver's seat 17, from the rear engine shaft 31 to the motion shafts 32, 33, the belt 34, the counter shaft 35, The power is rotated through the gear 36 and the like. Further, the engine radiator 37 and the radiator fan 38 are disposed between the belt 34 and the interlocking shaft 35 on the front side of the engine 23. Further, the HST pump shaft 1 of the lower HST case 3 is transmitted from the interlocking shaft 33 via the belt 39. The center of the rear end of the axle housing 6 is connected to the front side of the HST case 3, and the front wheel shaft 41 is mounted on the axle case 40 at the left and right ends of the axle housing 6 so that the left and right front wheels are driven to rotate. To do. A PTO case 42 is provided near one side of the front end of the axle case 40, and a front PTO shaft 43 is mounted to interlock the front mower. Further, the motor shaft 2 of the HST is extended rearward to transmit the rear differential gear 45 at the center of the rear axle housing 44 that interlocks the rear wheel 30.

  The mower deck 26 is provided below the step floor 19 so as to be movable up and down, and a pair of left and right blades 46 shafts 47 are arranged. The rear end of the mower deck 26 is brought close to the front wheel 22, and a chute 27 on the rear side of the mower deck 26 is positioned in the center between the left and right front wheels 22, and the rear upper blower 28 passes through the front axle housing 6. Inclined toward the suction port to communicate.

  Here, the transmission device according to the present invention is a center case at the center of an axle housing 6 in which a differential shaft 4 and a differential gear 5 are housed on the front side of an HST case 3 in which an HST pump shaft 1 and a motor shaft 2 are arranged on the left and right. 7 is connected to the center case 7, and a lateral brake shaft 10 that is interlocked from the motor shaft 2 via bevel gears 8 and 9 is mounted on the center case 7, and the front differential gear 5 is meshed and interlocked from the brake shaft 10. The configuration is as follows. When the HST pump shaft 1 is driven, the motor shaft 2 is transmitted in a variable speed, the brake shaft 10 is transmitted by meshing the bevel gears 8 and 9, and further transmitted from the brake shaft 10 to the differential gear 5 and the differential shaft 4. Thus, the left and right front wheels are driven. The PTO shaft is transmitted directly from the front end of the pump shaft 1 via the PTO interlocking shaft 15. In such an HST, since the pump shaft 1 and the motor shaft 2 are arranged on the left and right, the thickness of the HST case 3 can be reduced and the length in the front-rear direction can also be shortened. Since the axle housing 6 mounted with the lateral brake shaft 10 is directly connected to the front side of the HST case 3, the thickness and the longitudinal length of the axle housing 6 can be reduced. As a whole, the shafts 1, 2, 10, and 4 can be arranged substantially on the same plane so that they can be made thin and the front and rear lengths can be made short.

  Further, a side case 11 is joined to the outer side of the center case 7 to form a brake chamber 12, and a main brake disc 13 is provided at one end of the brake shaft 10 in the brake shaft 10. The motor shaft 2 is transmitted to the differential gear 5 and the differential shaft 4 via the brake shaft 10, and the main brake disc 13 on the brake shaft 10 is pressed to brake the rotation of the brake shaft 10, thereby the differential gear. 5. The rotation of the left and right differential shafts 4 and the left and right front wheels can be braked. The side of the brake chamber 12 in which the brake shaft 10, the main brake disc 13, and the like are housed is assembled with the brake shaft 10, the main brake disc 13, and the like by the side case 11 being attached to and detached from the center case 7. It is easy.

  A side brake disc 14 is provided on the differential shaft 4 located in the side case 11. When steering the front wheel, the left and right side brake discs 14 are pressed against each other to brake the rotation of the differential shaft 4 on this side, and the rotational drive of the differential shaft 4 on the opposite side is driven. The left and right front wheels can be steered with a rotational difference.

  Further, the PTO interlocking shaft 15 extending forward along the one core of the pump shaft passes through the shaft end face side of the brake shaft 10 and is mounted on the differential shaft 14 so as to intersect with each other. The PTO interlocking shaft 15 for interlocking the front PTO shaft is directly taken forward from the pump shaft 1 of the HST, and approaches the upper side of the differential shaft 4 through a position approaching the shaft end surface side of the brake shaft 10. It is transmitted through the axle housing 6 in a conventional manner so as to intersect. For this reason, the height difference between the PTO interlocking shaft 15 and the differential shaft 4 can be reduced, and the thickness of the axle housing 6 can also be reduced. In addition, the front PTO shaft transmitted from the PTO interlocking shaft 15 can be disposed immediately before the axle housing 6 to facilitate interlocking connection and transmission to the front-mounted work machine.

  The HST (hydraulic continuously variable transmission) has a trunnion shaft 16 and is rotated by an operation of a shift pedal, etc. to rotate the swash plate shaft from a neutral position to a forward position and a reverse position, thereby The board angle can be changed. In an HST hydraulic circuit having a variable displacement hydraulic pump and a fixed displacement hydraulic motor, the rotation and rotation direction of the pump shaft 1 is changed and changed by the change of the swash plate angle, and linked to the motor shaft 2. Is done.

  The HST case 3 is located below the blower 28, and the axle housing 6 is located below the driver seat 17. The axle housing 6 is configured in a fork shape in which axle cases 40 on both the left and right sides (in the forward direction) protrude forward, and a front wheel shaft 41 is mounted on the outer front end of the axle case 40. The axle housing 6 includes a center case 7 at the center and side cases 11 joined to the left and right sides, and is assembled so as to be disassembled by bolting. In the illustrated example, the motor shaft 2 is located on the left side of the HST case 3 and the pump shaft 1 is located on the right side. Therefore, in the axle housing 6 attached to the front side of the HST case 3, the brake shaft 10 is supported by the right and left inner walls 48 and 49 on the right side, and the front differential gear 5 and the like are disposed. The inner wall 49 on the right side is formed at a substantially lateral center portion of the center case 7, and the inner end portion of the right differential shaft 4, the right side of the differential gear 5, and the like are supported on the front portion of the inner wall 49. The left inner wall 48 is attached to the inside of the side case 11. The brake chamber 12 is formed between the side case 11 and the inner wall 48, and a main brake disc 13 is provided at the left end portion of the brake shaft 10 that is mounted in the lateral direction, so that the brake shifter arm 50 can be operated. Thus, the rotation of the brake shaft 10 can be braked with respect to the side case 11. The brake shaft 10 is mounted close to the front end of the motor shaft 2 and meshed with bevel gears 8 and 9. The differential shaft 4 is disposed at a slightly lower position than the brake shaft 10, and the PTO interlocking shaft 15 located in the center case 7 and extending in the front-rear direction is positioned at the center of the shaft end of the brake shaft 10. Is mounted on the differential shaft 4 so as to approach and intersect. This PTO interlocking shaft 15 is connected to the front end portion of the pump shaft 1 and can directly take out the rotation of the pump shaft 1 in a state where no HST shift is performed. The front end of the PTO interlocking shaft 15 is configured to be coupled to the front PTO 43 via the PTO clutch 51 on the clutch shaft 52 in a PTO case 42 attached to the front wall of the center case 7 and mounted on the front side.

  A differential shaft 4 rotated in conjunction with a differential gear 5 provided in a differential chamber between the center case 7 and the left side case 11 is supported by the left and right side case 11 parts. The differential shaft 4 that is supported by the left side case 11 is extended into a left axle case 40 that is attached to the outside, and a side brake disc 14 is attached to the outside of the side case 11 to operate the left brake shifter arm 53. Thus, the rotation of the left differential shaft 4 can be braked with respect to the side case 11. Further, the right differential shaft 4 has a differential gear 5 side end bearing on the inner wall 49 portion and an outer end bearing on the right side case 11 portion. The right side clutch disc 14 is provided on the differential shaft 4 in the right side case 11, and the rotation of the differential shaft 4 can be braked against the side case 11 by operating the right brake shifter arm 53. In each of the left and right axle cases 40, an interlocking gear 54 that interlocks from the end of the differential shaft 4 to the front wheel shaft 41 is disposed.

  The moor deck 26 is disposed in front of the front axle housing 6 configured as described above, and the chute 27 is disposed on the upper side. An input shaft 55 is provided on the mower deck 26 so as to be displaced to the right side, and is connected to the front PTO shaft 43 by an interlocking shaft 56. Since the front PTO shaft 43 is provided at a relatively low position, even if the mower deck 26 and the input shaft 56 are changed up and down, the change in the bending angle of the interlocking shaft 56 can be reduced and smooth transmission can be performed. . The chute 27 is provided at the center in the lateral direction of the rear side of the moor deck 26. The chute 27 is made to approach the upper surface of the center portion of the axle housing 6 with the bottom portion being sunk in the space between the left and right axle cases 40, and Since it is configured to communicate with the suction port of the upper blower 28, the configuration of the chute 27 is simple and easy, and the cut grass is smoothly conveyed. Further, the driver's seat 17 and the like can be lowered. Further, by lowering and shortening the positions of the HST case 3 and the axle housing 6 and the like, the distance from the rear engine 23 and the rear wheel 30 can be set short. The arrangement height of the arranged blower 28, the transmission mechanism for transmitting the blower 28, and the like can be reduced.

  The brake shifter arm 50 for braking the main brake disc 13 is rotated around the pedal shaft 57 against the return spring 58 by depressing the brake pedal 56 provided on the step floor 19. And it is rotated via a brake interlocking mechanism. In addition, an auto cruise lever 59 is provided in the vicinity of the driver's seat 17 so as to be rotatable around the lever shaft 61, and can be operated in an interlocked manner so as to maintain a constant rotation angle of the trunnion shaft 16 via the interlocking wire 60. It is configured. A friction disk 63 and a pressure plate 64 pressed by a spring 62 are provided around the lever shaft 61, and the operation position of the auto cruise lever 59 is fixed and maintained by the braking force of the friction disk 63 pressed by the spring 62 force. It is configured. The pressure plate 64 is configured to be pushed outward by a cam arm 66 that rotates around an adjacent arm shaft 65 against the force of the spring 62. The cam arm 66 is interlocked by the brake pedal 56 via a rod 67, a link arm 68, a rod 69, and the like. By depressing the brake pedal 56 to brake the main brake disc 13, the pressure plate 64 can be pushed open by the rotation of the cam arm 66, and the auto-cruise setting by the auto-cruise lever 59 can be released.

The top view of a front axle housing part. The left side view. The cross-sectional view which developed the PTO case. The left view of the whole tractor. The top view of the front mower part. The right side view of an auto cruise lever part. The rear view.

1 Pump shaft 2 Motor shaft 3 HST case 4 Differential shaft 5 Differential gear 6 Axle housing 7 Center case 8 Bevel gear 9 Bevel gear 10 Brake shaft 11 Side case 12 Brake chamber 13 Brake disc 14 Side brake disc 15 PTO interlocking shaft

Claims (1)

A step floor (19) is provided at the front portion of the seat floor (18) that supports the driver's seat (17), a steering handle (20) is provided at the step floor (19), and a pair of left and right is provided below the seat floor (18). The front wheel (22) is arranged, the engine (23) is mounted on the rear of the seat floor (18), and the upper part of the engine (23) is covered with the bonnet (24). A mower deck (26) is provided below the seat floor (18) with a collector (25) mounted, and turfgrass is cut and conveyed from the mower deck (26) via a chute (27), blower (28), and a lower 29. In the collector (25),
The center of the axle housing (6) in the center of the HST case (3) in which the HST pump shaft (1) and motor shaft (2) are arranged on the left and right sides, and the differential shaft (4) and the differential gear (5) are housed inside. A case (7) is connected, and the center case (7) is provided with a lateral brake shaft (10) linked from the motor shaft (2) via bevel gears (8) and (9). The front differential gear (5) is engaged with the brake shaft (10).
Configuration for transmitting the power of the pump shaft (1) from the PTO interlocking shaft (15) extending forward along the pump shaft core to the input shaft (55) on the mower deck (26) side via the interlocking shaft (56) age,
The input shaft (55) is located on the mower deck (26) and deviates to the right side in the lateral direction of the mower deck (26) .
A blower (28) and a lower (29) are provided immediately after the driver's seat (17),
The HST case (3) is disposed below the blower (28), the axle housing (6) is disposed below the driver seat (17),
The chute (27) is directed from the rear lateral central portion of the mower deck 26 toward the suction port of the rear upper blower (28) through the central portion between the pair of left and right front wheels (22) and the axle housing (6). A front mower characterized in that it is configured to incline and communicate .

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