JPH054827U - Continuously variable transmission for mobile agricultural machinery - Google Patents

Abstract

(57) [Summary] [Purpose] To shift the belt type continuously variable transmission and to switch between forward and reverse with one operating lever. [Structure] When the operation lever 65 is rotated around the shaft 61 along both ends of the guide 71, the lever 66, the rod 67,
The arms 11b and 15b are rotated via the link 14 to adjust the driving pulley 6 and the driven pulley 9 to continuously shift the belt type continuously variable transmission. And the guide 71
When the operation lever 65 is rotated about the shaft 63 along the bottom of the belt, the reverse rotation switching shaft 69 having the arm 69a is rotated via the operating piece 65a and the protrusion 65b in the low speed range of the belt type continuously variable transmission. The forward / reverse switching section is operated by the arm 69b to switch between forward and reverse.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mobile agricultural machine such as a rice transplanter, and more particularly to a belt type continuously variable transmission operating device that transmits engine rotation to a mission in a mission case.

[0002]

[Prior Art]

 In the conventional mobile agricultural machine that transmits the rotation from the engine to the mission in the mission case by the conventional belt type continuously variable transmission, the forward and reverse rotation of the operation device for operating the belt type continuously variable transmission and the mission in the mission case are performed. It was configured separately from the reverse operation unit that operates switching.

[0003]

[Problems to be solved by the device]

 When the above-mentioned mobile agricultural machine is switched from forward to reverse, the belt type continuously variable transmission is set in the low speed range by the operating device, and then the reversing operation portion is operated to set the traveling direction. After that, since the operating device set in the low speed range is operated up to the required speed range, there was the drawback that the operation of switching the traveling direction was complicated.

Therefore, according to the present invention, in the low speed range of the belt type continuously variable transmission, the operating means is operated in a direction orthogonal to the direction in which the belt type continuously variable transmission is operated by the operating means. It is an object of the present invention to provide a continuously variable transmission for a mobile agricultural machine that solves the problem.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above circumstances, and includes a fixed sheave (6a) fixed to a base end side of a drive shaft (5) of an engine (1) and a tip end side of the drive shaft. A drive side pulley (6) consisting of a movable sheave (6b) supported only for movement, and a fixed sheave (9a fixed to the tip end side of the main shaft (A) protruding from the mission case (3). ) And a driven pulley (9) consisting of a movable sheave (9b) slidably supported on the base end side of the main shaft (A), and a drive pulley (6) and a driven pulley (9). The power from the engine (1) is transferred to the forward / reverse switching section (40, 46, 40) via an endless belt (10) wound around 9) and a belt type continuously variable transmission (2) including 50) A mobile agricultural machine (P In, the drive side adjusting parts (11, 12) and driven side adjusting parts (3a, 15) for moving the movable sheaves (6b, 9b) in the axial direction, and the drive side adjusting part (11) and the driven side A connecting means (14) for connecting the side adjusting part (15) and an operating means for connecting the connecting means (14) and operating the drive side and driven side adjusting parts (11, 15) by moving in a predetermined direction. (61, 65, 66) and based on the movement of the operating means (61, 65, 66) in the direction orthogonal to the predetermined direction in the low speed range of the belt type continuously variable transmission (2), And a reverse rotation operating section (63, 65a, 65b, 69, 69a, 69b) for switching the reverse rotation switching section (40, 46, 50).

[0006]

[Action]

 Based on the above configuration, the operating lever (65) of the operating means (61, 65, 66) is operated in a predetermined direction, and the drive side adjusting portion (11) and the driven side adjusting portion (via the connecting means (14). The widths of the driving pulley (6) and the driven pulley (9) are adjusted by 15), respectively, and rotation from the drive shaft (5) of the engine (1) is controlled by the belt type continuously variable transmission (2). The speed is continuously changed and transmitted to the main shaft (A). Further, in the low speed range of the belt type continuously variable transmission device (2), that is, in the bottom part of the guide (71), the operation lever (65) moves in a direction orthogonal to the predetermined direction, and the reverse rotation operation part (63, 65a, 65b, 69, 69a, 69b) are interlocked with each other, and the forward / reverse operation switching section (40, 46, 50) is operated by the reverse operation section (63, 65a, 65b, 69, 69a, 69b).

[0007]

As described above, according to the present invention, the belt type continuously variable transmission (2) is continuously changed by operating the operation means (61, 65, 66) in a predetermined direction. And, in the low speed range of the belt type continuously variable transmission (2), the operating means (61, 65, 66) is operated via the reverse rotation operating parts (63, 65a, 65b, 69, 69a, 69b). When moving in the direction orthogonal to the predetermined direction, the forward / reverse rotation switching section (40, 46, 50) is switched between forward and reverse, so that gear shifting and forward / reverse switching can be greatly facilitated. Further, since the forward / reverse rotation switching portion (40, 46, 50) is switched in the low speed range of the belt type continuously variable transmission (2), the shock of the forward / reverse rotation switching can be alleviated and driving safety can be improved. Further, the operator's fatigue can be reduced by switching the operating means (65) between forward and reverse rotations on the front side of the operator.

The reference numerals in parentheses described above are for the purpose of contrasting with the drawings, but do not limit the present invention in any way.

[0009]

【Example】

 Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

As shown in FIGS. 4 to 6, the passenger rice transplanter P has a machine body 19 including an engine 1, a mission case 3, a frame 17, and the like, and a lifting link 20 is provided behind the machine body 19. The rice transplanting device 21 is supported via the planting device 21, and a planter 22 and a float 23 are attached to the lower part of the rice transplanting device 21. Further, the transmission case 3 has lateral axle housings 25a and 25b projecting from both sides, and vertical axle housings 26a and 26b are fixed to the lateral axle housings 25a and 25b so as to face downward (a little diagonally outward and outward). Has been done. The vertical axle housings 26a and 26b are elastically expandable and contractible, and the front wheels 27 and 27 are pivotally supported at the lower ends. A drive shaft 29 extends rearward from the lower rear end of the mission case 3 along the lower surface of the frame 17, and the drive shaft 29 is connected to a rear axle housing 30. Rear missions 31a and 31b are provided at both ends of the rear axle housing 30, and rear wheels 32 and 32 composed of paddy wheels are pivotally supported by the rear missions 31a and 31b. A clutch and a brake are provided in the rear axle housing 30, so that the rear wheels 32, 32 are independently powered and disconnected from each other, and the brakes are applied. Further, a PTO shaft 33 extends rearward from the upper rear end of the mission case 3, and the power from the transmission device G (see FIG. 3) in the mission case 3 is transmitted to the planter 22 and the like via the propeller shaft 35. It is being transmitted.

Next, the gear transmission G in the transmission case 3 will be described with reference to FIG. 3. The transmission case 3 is divided into two parts at substantially the center, and they are integrally assembled by bolts and nuts. The left end of the main shaft A is projected to the outside of the transmission case 3, a driven pulley 9 is attached, a collar 36 is provided in the middle of the main shaft A, and a sleeve 37 is provided between the collar 36 and the left bearing. Is prevented from moving in the axial direction and is axially supported by the main shaft A, and the sleeve 37 is integrally provided with a shift gear 39 and a gear 40. A clutch case 41 is attached to the right side portion of the main shaft A via a spline or the like so as to be movable in the axial direction, and a main clutch 42 is formed between the clutch case 41 and the sleeve 37. A sleeve 43 is fixed to the planter shaft D by a spline or the like. A gear 45 is axially slidably attached to the outer circumference of the sleeve 43 by a spline or the like, and a gear 46 is attached to an inner end of the sleeve 43. Installed. A bevel gear 47 is mounted on the right side of the center of the planter shaft D so as to be rotatable relative to the planter shaft D, and a torque limiter 49 is formed between the bevel gear 47 and the planter shaft D. The shift gear 39 has a smaller number of teeth than the gear 40, and the gear 45 meshes with the shift gear 39 or the gear 40 to enable the stock change with respect to the planter shaft D. .. The bevel gear 47 meshes with the bevel gear of the PTO shaft 33.

A gear 50 is axially slidably attached to the left end of the transmission shaft B, and a twin gear 51 having gears 51a and 51b is axially slidably attached to the right part. A bevel gear 52 meshing with the bevel gear of the drive shaft 29 (see FIG. 6) is fixed to the left part of the speed change shaft C, and a gear 53a meshing with the gear 51a is fixed to the right part of the speed change shaft C. A gear 53b that meshes with the gear 51b is fixed. A gear 56 that meshes with the gear 55a of the differential gear case 55 is fixed to an intermediate portion of the transmission shaft C. Front wheels 27, 27 are driven on both sides of the differential gear case 55 via drive shafts in the axle housings 25a, 25b, 26a, 26b (see FIG. 4).

Next, the belt type continuously variable transmission 2 will be described with reference to FIG. 1. A hydraulic drive pulley 7 is fixed to a base end portion of a drive shaft 5 which is an output shaft of the engine 1. The fixed sheave 6a of the drive side pulley 6 is fixed to the drive shaft 5 outside the hydraulic drive pulley 7 with a key or the like. A movable sheave 6b is axially slidably attached to the outer boss portion of the fixed sheave 6a by a key or the like. A cam member 11 having a cam portion 11a is rotatably attached to the boss portion of the movable sheave 6b via a bearing or the like. The cam portion 11a has a plurality of spiral profiles on the circumferential surface centering on the shaft 5, and the roller member 12 rolling on the profile of the cam portion 11a is radially attached to the ring 12a. The ring 12a is rotatably attached to the outer end side of the boss portion of the fixed sheave 6a.

A cam portion 3a (having a shape similar to that of the cam portion 11a) centering on the main shaft A is provided on the outer surface of the mission case 3 so as to roll on the profile of the cam portion 3a. The roller member 15 is radially attached to the ring 15a. The ring 15a is rotatably attached to the boss portion of the movable sheave 9b of the driven pulley 9. The movable sheave 9b is axially slidably attached to the main shaft A with a key or the like, and the fixed sheave 9a is fixed to the end of the shaft A.

Further, the cam member 11, the roller member 12, the ring 12a and the like constitute a drive side adjusting device 13, and the cam portion 3a, the roller member 15, the ring 15a and the like constitute a driven side adjusting device 16. There is. An endless belt 10 is stretched around the drive pulley 6 and the driven pulley 9.

An arm 12c extending outward from the ring 12a is prevented from rotating by a pin 8a (screw-in pin) provided on a fixing member 8 protruding laterally from the engine or the like.

Next, the operating device 18 of the belt-type continuously variable transmission 2 will be described with reference to FIGS. 2 and 1. The cam member 11 shown in FIG. An arm 15b is projectingly provided on 15a, and these arms 11b and 15b are connected by a link 14, and the shaft 5 and the shaft A, the arms 11b and 15b and the link 14 form a substantially parallelogram. ing. An arm 57 is pivotally supported by a pin 8a that prevents the arm 12c protruding from the ring 12a from rotating. A tight pulley 59 is pivotally supported by the tip of this arm 57, and a tension spring 60 is provided at the base end. The tension spring 60 is attached, and a predetermined tension is applied to the endless belt 10 via the tight pulley 59. Further, a mounting piece 62 is axially supported on the shaft 19 of the machine body 19 and a shaft 63 is mounted on the mounting piece 62. An operating piece 65a is axially supported on the shaft 63. An operation lever 65 is attached to 5a. A lever 66 is attached to the attachment piece 62, and the tip of the lever 66 and the tip of the arm 11b are connected by a rod 67 whose length is adjustable. Further, the operating piece 65a is provided with a protrusion 65b, and the protrusion 65b is engaged with the arm 69a of the reverse rotation switching shaft 69. When the sliding gear 50 provided on the transmission shaft B shown in FIG. 3 meshes with the gear 45 on the main shaft A, the machine body 19 moves forward and meshes with the gear 46 on the planter shaft D. The airframe 19 is designed to move backward.

As shown in FIG. 2B, the operation lever 65 is operated along a U-shaped guide 71. When moved right and left along the bottom of the guide 71, the right side (upper side in FIG. 2B) is the forward side, the left side is the reverse side, and the neutral position is midway. Further, when the operator switches between forward and backward movements and the lever 65 is moved forward, the speed is increased.

A belt 7a is stretched around a pulley 70 attached to the hydraulic pump shaft E shown in FIG. 3 and the hydraulic pressure drive pulley 7 shown in FIG.

Next, the operation of this embodiment will be described.

When the engine 1 is operated in the field, as the drive shaft 5 (see FIG. 1), which is the output shaft of the engine, rotates, the drive side pulley 6, the endless belt 10, and the driven side pulley 9 are used. , The spindle A is driven. Next, when the main clutch 42 is brought into contact, the gear 40 rotates, the bevel gear 47 is driven via the gear 45, the planter shaft D, and the torque limiter 49, and the PTO gear is engaged via the bevel gear 47. The shaft 33 (see FIGS. 5 and 6) is driven. At this time, if the gear 45 is meshed with the shift gear 39, the stock shift is performed (the stock distance is larger than that when the gear 40 is meshed).

Further, the rear wheels 32, 32 are driven at a low speed via the gear 40, the gear 50, the speed change shaft B, the gear 51 a, the gear 53 a, the speed change shaft C, the bevel gear 52, and the drive shaft 29. At this time, if the meshing of the gears 51a and 53a is switched to the meshing of the gears 51b and 53b, the rear wheels 32, 32 are driven at high speed.

The front wheels 27, 27 are driven by the gear 56 on the transmission shaft C meshing with the gear 55 a of the differential gear case 55. And, like the rear wheels 32, 32, it is possible to switch between high and low speed.

Further, when the gear 50 is moved to the right on the speed change shaft B, the engagement with the gear 40 is cut to the neutral position, and when it is further moved to the right, the gear 46 is engaged with the gear 46 on the planter shaft D. (FIG. 3 is a development view and is therefore displayed so as not to be meshed). Then, low-speed reverse rotation is transmitted to the variable speed shaft B via the main shaft A, the main clutch 42, the gear 40, the gear 46, and the gear 50. Then, after this, in the same manner as when the vehicle is moving forward, the rotation at a lower speed than that when moving forward is transmitted to the front wheels 27, 27 and the rear wheels 32, 32.

Next, the operation of the belt type continuously variable transmission 2 and its operating device 18 will be described with reference to FIGS. 1, 2 (a) and 2 (b). When the bottom portion of the guide 71 is rotated around the shaft 63, the reverse rotation switching shaft 69 is rotated via the protrusion 65b and the arm 69a, and the center is neutral by the arm 59b and the right end (the upper end in FIG. 2B). Is set to forward and the left end is set to reverse. That is, the gears 40 and 50 mesh to move forward, and the gears 46 and 50 mesh to move backward. Then, when the operation lever 65 is turned in the forward or backward position along the guide 71, that is, when the shaft 61 is rotated counterclockwise around the shaft 61 in FIG. 2A, the lever 66, the rod 67, and the link 14 are rotated. The arms 11b and 15b are rotated in the counterclockwise direction at substantially the same angle. The lift of the cam portion 11a is increased through the arm 11b, the cam member 11 is moved inward by the roller member 12, the movable sheave 6b is moved inward, and the roller member 15 is moved through the arm 15b. To a position where the lift is small, and the movable sheave 9b is moved inward (right side). Therefore, the endless belt 10 moves to the position shown on the outside in FIG. 1 and increases the rotation speed of the main shaft A more than the rotation speed of the drive shaft 5. Further, when the operation lever 65 is rotated clockwise in FIG. 2 (a), it moves to the position shown inside the shaft 5, A in FIG. The number is decelerated and transmitted to the input shaft A. Further, since the movement amount of the operation lever 65 can be made continuously variable, the belt type continuously variable transmission 2 can perform continuously variable gear shifting.

[Brief description of drawings]

FIG. 1 is a sectional front view of a belt type continuously variable transmission according to an embodiment of the present invention.

2A is a side view of the operating device, and FIG. 2B is a plan view showing a guide of the operating lever.

FIG. 3 is a developed sectional view of the mission.

FIG. 4 is a plan view showing the machine body.

FIG. 5 is a side view of the aircraft.

FIG. 6 is a side view of a riding rice transplanter embodying the present invention.

[Explanation of symbols]

1 engine 2 belt type continuously variable transmission 3 mission case 5 drive shaft 6 drive side pulley 6a fixed sheave 6b movable sheave 9 driven side pulley 9a fixed sheave 9b movable sheave 10 endless belts 11 and 12 drive side adjusting part (cam member, rolling) Moving member) 14 Connecting means (link) 15, 3a Driven side adjusting portion (roller member, cam portion) 40, 46, 50 Forward / reverse switching portion (gear) 61, 65, 66 Operating means (shaft, operating lever, lever) 63, 65a, 65b, 69, 69a, 69b Reverse rotation operation unit (shaft, actuating piece, protrusion, reverse rotation switching shaft, arm, arm) 71 Guide A Main shaft G Transmission device P Mobile agricultural machine (passenger rice transplanter)

Claims (1)

Claims for utility model registration 1. A drive comprising a fixed sheave fixed to the base end side of a drive shaft of an engine and a movable sheave supported slidably on the tip end side of the drive shaft. Side pulley, a driven sheave fixed to the tip end side of the main shaft protruding from the transmission case, and a driven sheave supported slidably only on the base end side of the main shaft, and these driven pulleys. The power from the engine is transmitted to a transmission device having a forward / reverse rotation switching unit via a belt type continuously variable transmission device including an endless belt wound around a side pulley and a driven pulley. In a mobile agricultural machine, a drive side adjusting part and a driven side adjusting part for moving both the movable sheaves in an axial direction, a connecting means for connecting the drive side adjusting part and the driven side adjusting part, and a connecting means for connecting the connecting means. , Operating means for operating the drive side and driven side adjusting portions by movement in a predetermined direction, and the forward / reverse rotation based on movement of the operating means in a low speed range of the belt type continuously variable transmission in a direction orthogonal to the predetermined direction. A continuously variable transmission in a mobile agricultural machine, comprising: a reversing operation unit for switching the switching unit.