JP2878492B2 - Power transmission device for mobile agricultural machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile agricultural machine such as a riding rice transplanter and, more particularly, to a main clutch of a power transmission device in a mobile agricultural machine.

[0002]

2. Description of the Related Art Conventionally, when a belt-type continuously variable transmission is provided between a drive shaft of an engine and a main shaft protruding from a transmission case, a fixed sheave of a driven pulley of the belt-type continuously variable transmission is mounted. A main clutch composed of a dry multi-plate clutch is rotatably supported on the base end side of the main shaft, and is disposed between the fixed sheave and the main shaft outside the transmission case, and is transmitted to the driven pulley. The continuously variable speed rotation is connected to and disconnected from the main shaft.

[0003]

However, in the system in which the main clutch is provided between the fixed sheave of the driven pulley and the main shaft outside the transmission case, the main clutch has a length necessary for the main clutch. The longer the protrusion, the larger the overall space. In addition, since the operating force position of the belt-type continuously variable transmission is far away from the transmission case, it is necessary to compensate for the decrease in the strength of the main shaft, and the main shaft is made thicker. And increase the cost.

Accordingly, an object of the present invention is to provide a power transmission device for a mobile agricultural machine which solves the above-mentioned problems by providing a main clutch on a main shaft in a transmission case.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a drive-side variable pulley (6) connected to a drive shaft (5) of an engine (1); A) A belt-type continuously variable transmission (2) having a driven variable pulley (9) connected to A) and a belt (10) wound around these pulleys; and a transmission case (3).
And a transmission (G) having a transmission (85, 86, 87) incorporated in the power transmission device (2, G) of the mobile agricultural machine (P). (3) is rotatably supported, and a part of the driven case is protruded from the transmission case (3), and the driven side variable pulley (9) is mounted on the protruded portion. A sleeve (37) is rotatably supported on the input side in 3),
A main clutch (42) is interposed between the sleeve (37) and the main shaft (A), and the sleeve (37)
, An output gear (40) is arranged, and power is transmitted from the output gear (40) to the transmission (85, 86, 87).

[0006]

Based on the above construction, the main shaft of the transmission (G) is driven from the drive shaft (5) of the engine (1) via the drive variable pulley (6), the belt (10) and the driven variable pulley (9). Power is transmitted to A), and further transmitted to transmissions (85, 86, 87) built in the transmission case (3). At this time, the power transmitted to the main shaft (A) is transmitted to the sleeve (37) via the main clutch (42), and further the output gear (4) attached to the sleeve (37).
0) is transmitted to the transmission (85, 86, 87).

[0007]

As described above, according to the present invention,
The main clutch (42) is interposed between the main shaft (A) in the transmission case (3) and the sleeve (37) rotatably supported on the input side of the main shaft (A). The overhang amount of the main shaft (A) projecting from 3) to the belt (10), which is the power transmission portion of the belt-type continuously variable transmission (2), is reduced, and the main shaft (A) can be made thinner. The whole power transmission device (2, G) can be made compact.

The reference numerals in the parentheses are for comparison with the drawings, but do not limit the configuration of the present invention.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 4 to FIG. 6, the riding rice transplanter P includes an engine 1, a transmission case 3, and a frame 1.
A rice transplanter 21 is supported at the rear of the fuselage 19 via an elevating link 20. A planter 22 is attached to a lower part of the rice transplanter 21 and a floater is mounted on the lower part of the rice transplanter 21. 23 are attached.
Further, the transmission case 3 has lateral axle housings 25a, 25b projecting from both sides, and the vertical axle housings 26a, 26b are fixed to the horizontal axle housings 25a, 25b so as to face downward (a little diagonally outward). ing. And, this vertical axle housing 26a, 2
6b can be elastically expanded and contracted, and the front wheels 27, 2
7 is supported. A drive shaft 29 extends rearward from the lower rear end of the transmission case 3 along the lower surface of the frame 17, and the drive shaft 29 is connected to the rear axle housing 30. Rear transmissions 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 supported by the rear transmissions 31a and 31b. The rear axle housing 3
A clutch and a brake are provided in 0, and power is disconnected and connected to the rear wheels 32, 32 independently of left and right, and a brake is applied. A PTO shaft 33 extends rearward from the upper rear end of the transmission case 3, and is connected via a propeller shaft 35 to the planter 2.
Transmission device G in transmission case 3 for 2 etc. (see FIG. 1)
Is transmitted.

Next, as shown in FIG.
The transmission case 3 will be described. The transmission case 3 is divided into two parts substantially at the center and is assembled integrally with bolts and nuts. The left end of the main shaft A protrudes outside the transmission case 3, and a driven pulley 9 is attached. A collar 36 is provided at an intermediate portion of the main shaft A, and a sleeve 37 is provided between the collar 36 and the left bearing.
Is stopped from moving in the axial direction, and is supported by the main shaft A,
The shift gear 39 and the gear 40 are integrally provided on the sleeve 37. A clutch case 41 is attached to the right side 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 them.

The main clutch 42 will be described in more detail. A plurality of disc springs 72 are stacked on the bottom of the clutch case 41, and a pressing plate 73 is provided in contact with the left side of the disc spring 72. The inner peripheral edge of the holding plate 73 comes into contact with the collar 36. A separator plate 75 is slidably mounted in the clutch case 41 in the axial direction. A clutch plate 76 sandwiched between the separator plates 75 is slidably mounted in the sleeve 37 in the axial direction. Note that the sleeve 37 is divided into two parts by a joint part 37a to facilitate assembly, and the joint part 37a is configured such that square-shaped concave and convex pieces are fitted to each other. Further, a stopper plate 77 is provided outside the separator plate 75, and the stopper plate 77 is stopped by the clutch case 41 by a retaining ring 79, so that the plates 75 and 76 do not escape from the clutch case.

The bearing 80 is provided in the clutch case 4.
The inner race of the bearing 80 is attached to the eccentric piece 81. The eccentric piece 81 is eccentrically attached to a clutch operating shaft 82. When the shaft 82 is rotated by operating a clutch pedal outside the transmission case 3, the eccentric piece 81 engages the clutch via a bearing 80. Case 4
1 moves to the left to disengage the clutch 42, and moves to the right to make contact.

Reference numeral 83 designates the shaft 82 as the transmission case 3
It is a support part that is supported inside.

The main shaft A is located in front of the transmission case 3, and the clutch operating shaft 82 is located in front of the main shaft A. A PTO shaft 33, which is an output device for a working machine, extends rearward from a planter shaft D located slightly above and behind the main shaft A. In addition, the inter-stock transmissions 39, 40, and 45, which constitute the work implement transmission 85 formed between the sleeve 37 and the planter shaft D, are located diagonally above and behind the main clutch 42. The traveling transmission 8
6 is located obliquely rearward and downward with respect to the main axis A. The traveling forward / reverse switching device 87 is located between the planter shaft D and the transmission shaft B. The main clutch 42 and its clutch operating shaft 82 are provided in the space where the working machine output device 33, the working machine transmission 85, the traveling transmission 86, and the traveling forward / reverse switching device 87 are formed. ing.

A sleeve 43 is fixed to the planter shaft D by a spline or the like. A gear 45 is mounted on the outer periphery of the sleeve 43 by a spline or the like so as to be slidable in the axial direction. 4
6 are attached. A bevel gear 47 is mounted on the right side of the intermediate portion of the planter shaft D so as to be rotatable relative to the planter shaft D.
Between them, a torque limiter 49 is formed. In addition,
The shift gear 39 is formed with a smaller number of teeth than the gear 40, and the gear 45 meshes with the shift gear 39 or the gear 40, thereby enabling inter-stock shifting with respect to the planter shaft D. Also, the bevel gear 47 is used for the PT
The O-shaft 33 meshes with the bevel gear.

A gear 50 is mounted on the left end of the transmission shaft B so as to be slidable in the axial direction, and gears 51a and 51 are mounted on the right.
The twin gear 51 having the letter “b” is mounted so as to be slidable in the axial direction. A bevel gear 52 that meshes with the bevel gear of the drive shaft 29 (see FIG. 6) is fixed to the left portion of the transmission shaft C. A gear 53a that meshes with the gear 51a and a gear 53a are mounted on the right side of the transmission shaft C. The gear 53b meshing 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. The axle housings 25a, 25b, 26a, 26b are provided on both sides of the differential gear case 55.
The front wheels 27,
27 is driven.

Next, the belt type continuously variable transmission 2 will be described with reference to FIG. 2. A hydraulic drive pulley 7 is fixed to a base end of a drive shaft 5 composed of an output shaft of the engine 1. A fixed sheave 6a of the drive side pulley 6 is fixed to the drive shaft 5 outside the hydraulic drive pulley 7 by a key or the like. The movable sheave 6b is attached to the boss outside the fixed sheave 6a by a key or the like so as to be slidable in the axial direction. A cam member 11 having a cam portion 11a is rotatably mounted on a boss portion of the movable sheave 6b via a bearing or the like. This cam portion 11a is
A plurality of spiral profiles are formed on a circumferential surface centered at the center, and a roller member 12 rolling on the profile of the cam portion 11a is radially attached to a ring 12a, and the ring 12a is fixed to a fixed sheave. 6a
Is rotatably mounted on the outer end side of the boss.

A cam portion 3a centering on the main shaft A (having a shape similar to that of the cam portion 11a) is provided on the outer surface of the transmission case 3.
The roller member 15 that rolls on the profile of the cam portion 3a is radially attached to the ring 15a. The ring 15a is rotatably mounted on the boss of the movable sheave 9b of the driven pulley 9. The movable sheave 9b is attached to the main shaft A slidably in the axial direction by a key or the like, and the fixed sheave 9a is fixed to the end of the shaft A.

A driving-side adjusting device 13 is constituted by the cam member 11, the roller member 12, the ring 12a, and the like, and a driven-side adjusting device 16 is constituted by the cam portion 3a, the roller member 15, the ring 15a, and the like. . An endless belt 10 is stretched between the driving 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 pin) provided on a fixing member 8 protruding laterally from the engine or the like.

Next, the operation device 18 of the belt-type continuously variable transmission 2 will be described with reference to FIGS. 3 and 2. The cam member 11 shown in FIG. An arm 15b is protruded from the arm 11b, and these arms 11b and 15b are connected by a link 14. A substantially parallelogram is formed by the shafts 5 and A, the arms 11b and 15b, and the link 14. . An arm 57 is pivotally supported by a pin 8a that prevents the arm 12c protruding from the ring 12a. A tight pulley 59 is pivotally supported at the tip of the arm 57, and a tension spring 60 is attached to the base end. The tension of the tension spring 60 applies a predetermined tension to the endless belt 10 via the tight pulley 59. Further, the shaft 6 is provided on the body 19 in a lateral direction.
1, a mounting piece 62 is pivotally supported, a shaft 63 is provided on the mounting piece 62, an operating piece 65a is pivotally supported on the shaft 63, and an operation lever 65 is mounted on the operating piece 65a. 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 can be adjusted. Also, the operating piece 65
a is provided with a projection 65b, and this projection 65b is engaged with the arm 69a of the reverse rotation switching shaft 69. The sliding gear 50 provided on the speed change shaft B shown in FIG.
However, the fuselage 19 moves forward when it meshes with the gear 45 on the main shaft A, and moves backward when it meshes with the gear 46 on the planter shaft D.

A U-shaped guide 71 as shown in FIG. 3 (b) is attached to the body, and a lever 65g which is attached to the operation lever 65 and moves together is operated along the guide 71. . When the guide 71 is moved right and left along the bottom, the right side (upper side in FIG. 3B) is the forward side, the left side is the reverse side, and the neutral position is in the middle. Further, switching between forward and backward is performed on the operator side, and the lever 65 is moved forward.
When you move, it becomes faster.

A belt 7a is stretched between a pulley 70 attached to the hydraulic pump shaft E shown in FIG. 1 and a hydraulic drive pulley 7 shown in FIG.

Next, the operation of this embodiment will be described.

In the field, when the engine 1 is operated, as the drive shaft 5 (see FIG. 2), which is the output shaft of the engine, is rotated, the pulley 6 is driven through the drive pulley 6, the endless belt 10, and the driven pulley 9, The main shaft A is driven. Then, when the main clutch 42 is brought into contact, the gear 40 rotates and the gear 4
5. The bevel gear 47 is driven via the planter shaft D and the torque limiter 49, and the PTO shaft 33 is driven via the bevel gear meshing with the bevel gear 47 (see FIGS. 5 and 6).
Is driven. At this time, when the gear 45 is meshed with the shift gear 39, the inter-stock speed is changed (the inter-stock distance becomes larger than when meshing with the gear 40).

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

The front wheels 27, 27 are driven by the gear 56 on the transmission shaft C meshing with the gear 55a 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 rightward on the speed change axis B, the engagement with the gear 40 is cut off, and the gear 50 is shifted to the neutral position.
6 (because FIG. 1 is a development view, it is displayed so as not to mesh). Then, the low-speed reverse rotation is transmitted to the transmission shaft B via the main shaft A, the main clutch 42, the gear 40, the gear 46, and the gear 50. And
Thereafter, the rotation at a lower speed than in the forward movement is transmitted to the front wheels 27, 27 and the rear wheels 32, 32 in the same manner as in the forward movement.

Naturally, the working machine transmission 85 changes the gear 45 into mesh with the shift gear 39 and the gear 40, and the traveling transmission 86 uses the gear 51a and the gear 5a.
The gear 51b and the gear 53b are meshed with each other from the mesh with the gear 3a, and the forward / reverse switching device 87 changes the gear 50 from the gear 40 to the gear 46, and there is a speed difference between the gears to be meshed. Therefore, when the clutch operating shaft 82 is operated and the main clutch 42 is disengaged, the impact on the gear to be meshed is reduced by changing the gear meshing.

Next, referring to FIGS. 2, 3 (a) and 3 (b),
The operation of the belt-type continuously variable transmission 2 and the operation device 18 will be described. When the operation lever 65 is rotated around the shaft 63 at the bottom of the U-shaped guide 71, the protrusion 65b, the arm 6
9a, the reverse rotation switching shaft 69 is rotated, and the arm 59 is rotated.
By b, the center is neutral, the right end (the upper end in FIG. 3B) is set to forward, and the left end is set to reverse. That is, the gears 40 and 5
When the gears are engaged with each other, the gears 46 and 50 are moved forward. Then, in the forward or backward position, the operation lever 6
3 is rotated counterclockwise around the shaft 61 in FIG.
6, the arm 11b through the rod 67 and the link 14,
15b is rotated in the counterclockwise direction at substantially the same angle. The lift of the cam portion 11a is increased via the arm 11b, the cam member 11 is moved inward by the roller member 12, and the movable sheave 6b is moved inward, and
The movable sheave 9b is moved inward (right side) by moving the roller member 15 to a position where the lift of the cam portion 3a is small via b. 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, the operation lever 65 is
In (a), when it rotates clockwise, it moves to the position shown inside the shafts 5 and A in FIG. 2 and the rotation speed of the shaft 5 is reduced. Is transmitted. Since the moving amount of the operation lever 65 can be set to be continuously variable, the belt-type continuously variable transmission 2 can perform a continuously variable transmission.

[Brief description of the drawings]

FIG. 1 is a developed sectional view of a mission according to an embodiment of the present invention.

FIG. 2 is a sectional front view of the belt type continuously variable transmission.

3A is a side view of the operation device, and FIG. 3B is a plan view showing a guide of the operation lever.

FIG. 4 is a plan view showing the airframe.

FIG. 5 is a side view of the airframe.

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

[Explanation of symbols]

REFERENCE SIGNS LIST 1 engine 2 belt-type continuously variable transmission 2, G power transmission device (belt-type continuously variable transmission, transmission) 3 transmission case 5 drive shaft 6 drive-side variable pulley (drive-side pulley) 9 driven-side variable pulley (driven side) Pulley) 37 Sleeve 40 Output gear (gear) 42 Main clutch (Main clutch) 85 Transmission for work equipment 86 Transmission 87 Forward / reverse switching device for traveling A Main shaft G Transmission (Transmission device) P Moving agricultural machine (Riding rice transplanter)

Claims (1)

(57) [Claims] 1. A belt-type continuously variable transmission having a drive-side variable pulley connected to a drive shaft of an engine, a driven-side variable pulley connected to a main shaft, and a belt wound around these pulleys, and a transmission. A transmission having a transmission built in the case, the power transmission device in a mobile agricultural machine, comprising: a rotatable support of the main shaft on the transmission case; Mounting the driven side variable pulley on a portion of the transmission shaft, rotatably supporting a sleeve on an input side portion of the main shaft in the transmission case, interposing a main clutch between the sleeve and the main shaft, and A power transmission device for a mobile agricultural machine, wherein an output gear is disposed in the power transmission device, and power is transmitted from the output gear to the transmission. .