JP2652391B2 - Work equipment mounting device on tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a work for a tractor in which a farm work machine is connected to a farm tractor via a three-point link hitch mechanism having an automatic connection function so as to be able to move up and down, and rotational power is transmitted from the farm tractor to the farm work machine. The present invention relates to a machine mounting device.

2. Description of the Related Art Conventionally, a working machine is connected to the rear of a tractor via a three-point link hitch mechanism having an automatic connection function so as to be able to move up and down.
A power transmission mechanism is provided that has a bending transmission portion that can bend on the tractor side and the work machine side from the tractor to the work machine and transmits rotational power, and this power transmission mechanism is automatically operated when the work machine is connected or disconnected. A power transmission state or a power transmission release state is disclosed in, for example,
It is known from the publication 65602. This power transmission mechanism of the prior art has a configuration in which a pawl clutch is provided on one of the bending transmission portions to be engaged and disengaged.

[Problems to be solved by the invention]

In the power transmission mechanism of the prior art, since the pawl clutch is automatically engaged and disengaged, centering is particularly important when the clutch is engaged, and only an error of about ± 3 mm is allowed.
For this reason, a highly accurate structure is required for the work implement coupling device and the power transmission mechanism. In addition, the sealing property of the joint is poor,
In particular, there is a problem in the sealing property when the sheet is bent. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a working machine mounting device that facilitates insertion and removal operations of a power transmission mechanism, and in particular, improves sealability of a joint.

[Means for Solving the Problems]

In order to achieve the above object, in the present invention, the work implement 2 is connected to the tractor 1 via a link mechanism 3 having an automatic connection function so as to be able to move up and down, and the tractor 1 is connected from the tractor 1 to the work implement 2. In a working machine mounting device provided with a power transmission mechanism 12 that has a bending transmission portion that can be bent on the side and the work machine 2 side and transmits or cancels rotational power, the power transmission mechanism 12 is provided on the tractor 1 side or A constant-velocity joint 15 for transmitting rotational power at a constant speed is disposed on one or both of the bending transmission portions of the working machine 2, and the constant-velocity joint 15 is connected to the working machine 2 or the tractor 1. Outer race 16 or inner race fixed to
17, an inner race 17 or an outer race 16 attached to the slide transmission shaft 14 side is provided so as to be insertable and removable, and on the outer periphery of the outer race 16 and the inner race 17,
The arc-shaped seal cover 28 and the outer seal 30 are connected to each other so as to be detachable from each other, and the inner circumference of the seal cover 28 on the outer race 16 side is rotated by the centrifugal force during rotation on the outer circumference of the outer seal 30 on the inner race 17 side. It is characterized in that a flexible member 31 that is in close contact with the surface is provided.

[Action]

By having the above configuration, the working machine mounting device of the present invention can be reliably sealed by rotating while the power transmission mechanism 12 is fitted, and the fitting portion can be smoothly inserted and removed, and good. Power transmission is achieved.

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes an agricultural tractor, 2 denotes a rotary agricultural working machine, and a top link 4 and a lower link 5 of a three-point link mechanism 3 are provided at a rear portion of the agricultural tractor 1. An auto hitch hanger 6 is connected to the top link 4 and the lower link 5 so that the top link 4 and the top mast 7 of the rotary agricultural machine 2 can be automatically connected. A PTO shaft 9 projects from the rear of the agricultural tractor 1,
The input shaft 11 projects forward from the transmission case 10 of the rotary agricultural machine 2. PTO axis 9 and input axis 11
Are connected by a power transmission mechanism 12 so that rotational power is transmitted. The power transmission mechanism 12 includes a bending transmission section 13 formed of a universal joint on the tractor side and a slide transmission shaft. 14 and a bending transmission portion 15 comprising a universal joint on the working machine side. The bending transmission section 13 on the tractor side is constituted by a wide-angle joint for transmitting rotational power at a constant speed, and the bending transmission section 15 on the working machine 2 side is moved from the tractor 1 side to the working machine 2 side.
It consists of a tripod constant velocity joint that transmits rotational power to the side at a constant velocity. The bending transmission portion (tripod constant velocity joint) 15 on the work machine 2 side includes an outer race 16 of a tripod constant velocity joint attached to the input shaft 11 and an inner race 17 of a tripod constant velocity joint attached to the slide transmission shaft 14. ,
A rotation support portion 18 for rotatably supporting the slide transmission shaft 14 on the front side of the inner race 17, a movable lock plate 19 having a base end fixed to the rotation support portion 18, and a base case for the transmission case 11.
The fixed lock plate 20 is fixed to the side, and can be engaged with and disengaged from the movable lock plate 19. And
The rotation support portion 18 is supported by a bracket 21 provided on the auto hitch hanger 6 at a lower end portion of an operation lever 23 having a lower end portion movably forward and backward and left and right via a spring 22. Movement and movement in the axial direction are possible. The tripod constant velocity joint, as shown in FIG.
The inner race main body 25 is inserted into the outer race main body 24 while moving in the axial direction and the axial circumferential direction, and is provided so as to be separated from the outer race main body 24. A wide-angle guide 26 is provided, and an arc-shaped seal cover 28 is provided on the base outer periphery of the guide 26 via a spring 27 so as to be able to move back and forth, and the outer periphery is circular in front of the spring 27 of the arc-shaped seal cover 28. An inner seal 29 made of arcuate urethane rubber is provided so as to be able to move back and forth together with the seal cover 28. On the other hand, an arc-shaped outer seal 30 is provided on the inner race main body 25 side, and is in airtight contact with the outer periphery of the inner seal 29 when the inner race main body 25 is inserted into the outer race main body 24. . Furthermore, outer seal
A flexible plate 31 such as a rubber plate is attached to the outer periphery of the plate 30. The plate 31 has cuts at a plurality of locations, and is sealed by centrifugal force when the outer seal 30 rotates. The cover 28 comes into close contact with the inner surface. As shown in FIGS. 3 and 4, the outer race main body 24 is provided with a guide surface 24a which is symmetrically inclined toward the tripod at the tip of each inner protruding portion of the tripod. As shown in FIGS. 5 and 6, an asymmetric guide surface 24b having one longer side may be formed at the tip of the inner protruding portion of the tripod of the outer race body 24. The rotation support portion 18 has an O-ring 32
The bearing 33 is inserted into the housing 34 and is housed in the housing 34. The outer portion of the housing 34 is supported by the operation lever 23. A pin roller 19 is provided at the tip of the movable lock plate 19.
a, and this pin roller 19a is engaged with an engagement hole 20a formed in a hook shape in the fixed lock plate 20,
It is detachable, and under the engagement hole 20a,
The guide plate 20b is provided so as to extend forward. On the transmission case 10 side, when the outer race main body 24 and the inner race main body 25 of the tripod constant velocity joint are fitted, a safety cover 35 covering the upper part thereof is rotatable between a cover position and a cover release position. It is provided in. This safety cover 35 has an engagement hole when it is in the cover position.
Prevents the pin roller 19a engaged with 20a from coming off,
A lock piece 35a for holding a locked state is provided,
The safety cover and the lock function are combined. In the device for mounting a working machine to a tractor having such a configuration, when connecting the rotary farm working machine 2 to the agricultural tractor 1, the lower link 5 of the three-point link mechanism 3 is operated to connect the hook 6a of the auto hitch hanger 6 to the agricultural machine. When the rotary farming machine is engaged with the top mast 7 of the rotary farming machine 2 and lifted, the lower part of the rotary farming machine 2 moves slightly forward, and the lower link pin of the auto hitch hanger 6 and the rotary farming machine 2 The lower link connecting portion 8 is engaged, and the rotary agricultural working machine 2 is automatically connected to the agricultural tractor 1. When the rotary agricultural working machine 2 is connected to the agricultural tractor 1, the input shaft of the rotary agricultural working machine 2 of the power transmission mechanism 12 is connected.
The outer race 16 of the tripod constant velocity joint fixed to 11 and the inner race 17 of the tripod constant velocity joint attached to the slide shaft 14 and supported by the operation lever 23 are close to and almost opposite to each other. With the cover 35 in the release position, the operator holds the operation lever 23 in the rearward position while riding on the agricultural tractor 1, slides the inner race 17 in the axial direction, and also moves the inner race 17 in the circumferential direction of the outer race. At the same time, the pin roller 19a of the movable lock plate 19 moves on the guide plate 20 and engages with the engagement hole 19a by the rotation of the operation lever 23, and the safety cover 35 is brought into the cover state to lock the lock piece 35a. To lock. At the time of the fitting operation of the outer race 16 and the inner race 17 of the tripod constant velocity joint as described above, even if the respective axes are slightly displaced, the inner race 17 has its inner race body 25 formed by the wide-angle guide 26. The guide surface 24a or 24b is formed here even if the tip of the inner race main body 25 collides with the inner protruding portion of the outer race main body 24 even if the tip is guided to the axial center side. 25 is smoothly guided by the tripod side. Further, even when the outer seal 30 comes into contact with the seal cover 28 when the outer race 16 and the inner race 17 are fitted, the seal cover 28 is not moved by the spring 27 and is not damaged. Even if the outer seal 30 contacts the inner seal 29 in an eccentric state, the outer seal 30 and the inner seal 29 are appropriately joined by being retracted by the spring 27 as described above. Then, when the PTO shaft 9 is rotated, the rotational power is transmitted to the input shaft 11 via the wide-angle short 13, the slide transmission shaft 14, and the tripod constant velocity joint 15, and drives the working unit of the rotary agricultural work machine 2. At the time of this power transmission, since the tripod constant velocity joint is used in the present invention, power transmission from the agricultural tractor 1 to the rotary agricultural working machine 2 is performed at a constant speed, and the rotary agricultural working machine 2 operates normally. Further, even when the rotary agricultural machine 2 is raised and lowered by the three-point link mechanism 3 and the bending angles of both the bent portions 13 and 15 are increased, the tripod constant velocity joint is used for the bent portion 15 and this is connected to the spherical surface. Since it is covered with the inner seal 29, the outer seal 30, and the seal cover 28, the rotation at the joint portion is smooth and does not generate abnormal noise,
In addition, the flexible plate 31 is rotated by centrifugal force to seal the cover.
The power transmission is performed smoothly without water or dust entering inside by closely contacting the inner peripheral surface of 28. Also, some vibration generated at the joint is absorbed by the O-ring 32. When the connection between the agricultural tractor 1 and the rotary agricultural work machine 2 is released, the driving of the rotary agricultural work machine 2 and the travel of the agricultural tractor 1 are stopped, and the safety cover 35 is first released with the rotary agricultural work machine 2 grounded. Then, the inner race 17 is moved toward the agricultural tractor 1 after the engagement between the pin roller 19a and the engagement hole 20a is released by grasping the operation lever 23, and the inner race body 25 is contracted with the slide transmission shaft 14 and the outer race is moved. It comes out of the main body 24 and enters the power cutoff state. Thereafter, the connection between the lower link pin and the lower link connecting portion 8 is released, and the engagement between the hook portion 6a and the top mast 7 is released, so that the connection between the agricultural tractor 1 and the rotary agricultural work machine 2 is released. At this time, even if mud or the like adheres to the entrance portion of the seal cover 28, it is not scraped off by the flexible plate 31 and enters the outer race main body 25. The above-mentioned tripod constant velocity joint may be inserted and removed with the inner race 17 attached to the input shaft 11 and the outer race 16 attached to the slide transmission shaft 14. Further, the tractor-side bending transmission section 13 may be a tripod constant velocity joint, and may be similarly inserted and detached. Further, another agricultural work machine may be used instead of the rotary agricultural work machine 2.

【The invention's effect】

As described above, according to the working machine mounting apparatus for a tractor of the present invention, the tractor 1 has a bending power transmission unit to the working machine 2 and transmits or cancels rotational power to the power transmission mechanism 12 that cancels transmission. For the outer race 16 or the inner race 17 fixed to the work implement 2 side or the tractor 1 side,
A constant velocity joint 15 capable of inserting and removing the inner race 17 or the outer race 16 attached to the slide transmission shaft 14 side is provided.Around the outer race 16 and the inner race 17, an arc-shaped seal cover 28 and an outer seal 30 are mutually connected. A flexible member 31 is provided on the outer periphery of the outer seal 30 so as to be in close contact with the inner peripheral surface of the seal cover 28 by the centrifugal force during rotation.
In the joined state of the inner race 17 and the inner race 17, the sealing performance is ensured, and the entry of water, soil, dust, and the like to the joined portion is reliably prevented. In addition, even when the bending transmission portion is bent, it can be smoothly bent. In addition, outer race 16 and inner race
Leakage of grease and the like in 17 is prevented, and generation of noise is also prevented.

[Brief description of the drawings]

1 is a schematic side view of a working machine mounting device showing an embodiment of the present invention, FIG. 2 is a plan sectional view of a tripod constant velocity joint, FIG. 3 is a side sectional view of an outer race body of the tripod constant velocity joint, FIG. 4 is a front view thereof, FIG. 5 is a side sectional view showing another embodiment of the outer race body, FIG. 6 is a front view thereof, and FIG. 7 is a side view of a lock plate and a safety cover. 1 ... agricultural tractor, 2 ... rotary agricultural work machine, 3 ...
3-point link mechanism, 4 ... Top link, 5 ... Lower link, 6 ... Auto hitch hanger, 7 ... Top mast,
8 Lower link connecting part, 9 PTO shaft, 10 Transmission case, 11 Input shaft, 12 Power transmission mechanism, 13
… Tractor side bending transmission part (wide angle joint), 14 …… Slide transmission shaft, 15 …… Work equipment side bending transmission part (tripod constant velocity joint), 16 …… Outer race, 17 …… Inner race, 18 …… Rotation Supporting part, 19: movable lock plate, 19a: pin roller, 20: fixed lock plate, 2
0a engagement hole, 20b guide plate, 21 bracket, 22,
27 ... Spring, 23 ... Operation lever, 24 ... Outer race body, 24a, 24b ... Guide surface, 25 ... Inner race body, 2
6 ... Guide, 28 ... Seal cover, 29 ... Inner seal, 30 ... Outer seal, 31 ... Flexible plate, 32 ... O
Ring, 33 ... Bearing, 34 ... Housing, 35 ...
Safety cover, 35a ... Lock piece.

Claims (1)

(57) [Claims] A work machine (2) is connected to a tractor (1) via a link mechanism (3) having an automatic connection function so as to be able to move up and down, and the tractor (1) is connected to the work machine (2). (1) A work implement mounting device provided with a power transmission mechanism (12) that has a bending transmission part that can be bent on the side and the work machine (2) side and that transmits or cancels rotational power. (12) A constant velocity joint (15) for transmitting rotational power at a constant speed is disposed on one of the tractor (1) side and the working machine (2) side, or on both of the bending transmission portions, The constant velocity joint (15) has an inner race (14) mounted on the slide transmission shaft (14) side with respect to the outer race (16) or the inner race (17) fixed to the work machine (2) side or the tractor (1) side. Insert / remove lace (17) or outer lace (16) The outer race (16) and the inner race (17) are provided with an arc-shaped seal cover (28) and an outer seal (30) on the outer periphery of the outer race (16) and the inner race (17). A flexible member (31) is provided on the outer periphery of the outer seal (30) on the side of the outer race (16), which adheres to the inner peripheral surface of the seal cover (28) on the side of the outer race (16) due to the centrifugal force during rotation. A work equipment mounting device to the tractor to be moved.