JP2532246B2 - Equipment for attaching work equipment to tractors - 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.

[Prior art]

Conventionally, a work machine is connected to the rear part of a tractor via a three-point link hitch mechanism that has an automatic connection function so that it can be raised and lowered
A power transmission mechanism for transmitting rotational power from the tractor to the work machine, which has a bending transmission section that can be bent on the tractor side and the work machine side, is provided.This power transmission mechanism is automatically used when connecting or disconnecting the work machine. A method for automatically setting a power transmission state or a power transmission release state is disclosed in, for example, JP-A-62-6.
It is known from Japanese Patent No. 5602. In this prior art, the power transmission mechanism has a structure in which one of the bending power transmission parts is provided with a pawl clutch to engage and disengage.

[Problems to be Solved by the Invention]

In the power transmission mechanism of the above-mentioned prior art, centering is important particularly in the case of engagement because the pawl clutch is automatically engaged and disengaged, and only a tolerance of about ± 3 mm is allowed. Therefore, a highly accurate structure is required for the work implement connecting device and the power transmission mechanism. In addition, the tractor and work equipment are
Since they had to be accurately connected to each other, it was necessary to prepare in advance those that were suitable for the respective tractors and working machines, and there was no versatility.

[Means for Solving the Problems]

The present invention has been made in view of the above circumstances, and has a work machine 2 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.
On the other hand, in the working machine mounting device provided with a power transmission mechanism 12 having a bending transmission portion that can be bent on the tractor 1 side and the working machine 2 side to transmit rotational power, the power transmission mechanism 12 is the tractor 1 side. Alternatively, a constant velocity joint 13 for transmitting rotational power at a constant velocity is provided to one of the working machine 2 side or both of the bending transmission sections,
One of the one or both constant velocity joints 13 is constituted by a constant velocity ball joint 15, and the constant velocity ball joint 15 is fixed to the working machine 2 side or the tractor 1 side, and a wide angle guide 15c is provided at the inlet portion. An inner race 15b having a plurality of balls on the outer circumference is elastically supported via a slide transmission shaft 14 and a spring 17 so that the inner race 15b has a plurality of balls on the outer circumference. It is characterized by that.

[Action]

With the above configuration, the working machine mounting apparatus of the present invention does not require centering accuracy when the power transmission mechanism is engaged, and thus the versatility of the tractor and the working machine is enhanced. In addition, power transmission of constant speed rotation is achieved.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is an agricultural tractor, 2 is a rotary agricultural work machine, and a top link 4 and a lower link 5 of a three-point link mechanism 3 are provided at the rear 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 is projected at the rear of the agricultural tractor 1,
Further, the input shaft 11 projects forward from the mission case 10 of the rotary farm work machine 2. PTO shaft 9 and input shaft 11
The power transmission mechanism 12 is connected by a power transmission mechanism 12 to transmit the rotational power. The power transmission mechanism 12 includes a bending transmission portion 13 on the tractor side and a slide transmission shaft.
14 and a bending transmission portion 15 on the working machine side.
The bending transmission portion 13 on the tractor side is a wide-angle constant velocity joint that transmits rotational power at a constant velocity, and the bending transmission portion 15 on the working machine side is a constant velocity ball joint. As shown in FIGS. 2 to 4, the constant velocity ball joint 15 has an outer race 15a having a plurality of ball guide grooves on the inner peripheral surface thereof, which is fixed to the input shaft 11 of the rotary agricultural working machine 2 and is provided at the inlet thereof. A wide-angle guide 15c having a plurality of ball guide grooves is provided on the inner peripheral surface. This wide angle guide 15c
The outer race 15a is for guiding the inner race 15b having a plurality of balls on the outer circumference, and the cross-sectional shapes thereof are substantially similar to each other, as is apparent from FIGS. 3 and 4. Meanwhile, the inner race 15b of the constant velocity ball joint 15
Is attached to the tip of the slide shaft 14a of the slide transmission shaft 14. An intermediate portion of the sliding shaft 14a is supported by a bearing 16, and an upper portion of an outer race 16a of the bearing 16 is a bracket provided on the auto hitch hanger 6 via a spring 17.
Suspended on 6b. Further, one end of an operating lever 18 is fixed to a side portion of the outer race 16a of the bearing 16,
The other end is extended to the agricultural tractor 1 side so that it can be operated from the tractor side with a grip. Further, a locking rod 19 is fixed to the operating lever 18, and the locking rod 19
19 is a plurality of guide grooves fixed to the auto hitch hanger 6.
20 can be selectively engaged. In the work implement mounting device for a tractor having such a configuration, when the rotary farm work device 2 is connected to the agricultural tractor 1, the lower link 5 of the three-point link mechanism 3 is operated to cause the hook portion 6a of the automatic hitch hanger 6 to operate. When the rotary farm implement 2 is engaged with the top mast 7 and the rotary farm implement is lifted, the lower part of the rotary farm implement 2 moves slightly forward and the lower link pin of the automatic hitch hanger 6 is moved.
6c and the lower link connecting portion 8 of the rotary farm work machine 2 are engaged with each other, and the rotary farm work 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.
Outer race of constant velocity ball joint 15 fixed to 11
15a and wide-angle guide 15c, and sliding shaft 14a of sliding shaft 14
Inner race of constant velocity ball joint 15 mounted on
It is in a position close to and close to 15b, and the operator holds the operating lever 18 in a posture of facing backward while riding on the agricultural tractor 1, and inserts the inner race 15b into the outer race 15a through the wide-angle guide 15c. The locking rod 19 into the guide groove 2
Engage with 0. In this engaging operation, since the inner race 15b is suspended by the spring 17 at a position substantially facing the wide-angle guide 15c, the ball position is regulated by the wide-angle guide 15c while extending the sliding shaft 14a by the operation lever 18. However, it can be easily introduced into the outer race 15a. Then, when the PTO shaft 9 is rotated, the rotational power is transmitted to the input shaft 11 via the wide-angle constant velocity joint 13, the slide transmission shaft 14, and the constant velocity ball joint 15, and drives the working portion of the rotary agricultural work machine 2. . At the time of this power transmission, since the constant velocity ball joint 15 is used in the present invention, the power transmission from the agricultural tractor 1 to the rotary farm work machine 2 is performed at a constant speed to normally operate the rotary farm work machine 2. Further, even when the rotary agricultural work machine 2 is moved up and down by the three-point link mechanism 3 and the bending angle of both bending portions 13 and 15 becomes large, a constant velocity ball joint is used on one of the bending portions, so the joint portion With this, smooth power transmission is performed without generating abnormal noise. When disconnecting the agricultural tractor 1 and the rotary agricultural work machine 2, the drive of the rotary agricultural work machine 2 and the traveling of the agricultural tractor 1 are stopped, and the operation lever 18 is grasped while the rotary agricultural work machine 2 is grounded. When the inner race 15b and the sliding shaft 14a are moved to the agricultural tractor 1 side after the engagement between the engaging groove 19 and the engaging groove 20 is released, the inner race 15b contracts with the sliding shaft 14a and the outer race 15a and the wide-angle guide 15c. The power is cut off. Then lower link pin
Release the connection between 6c and the lower link connecting part 8, and hook part 6a
And the top mast 7 are disengaged, and the connection between the agricultural tractor 1 and the rotary farm work machine 2 is released. Instead of the constant velocity ball joint 15, as shown in FIGS. 5 to 7, the inner race 21b is made up of a needle bearing 21c and a roller 21d, and the outer race 21a is provided via a wide-angle guide 21e. The constant velocity joint 21 may be inserted into and removed from the. Further, the three-point link mechanism 3 may be replaced by a two-point link mechanism, and the wide-angle constant velocity joint 13 may be replaced by a constant velocity ball joint, a needle bearing, or a constant velocity joint using rollers. , Rotary farming machine 2
Instead of this, other agricultural working machines may be used.

【The invention's effect】

As described above, according to the work implement mounting apparatus for the tractor of the present invention, the power transmission mechanism 12 applies the rotational power to the bending transmission portion of either the tractor 1 side or the work implement 2 side, or both of them. Constant velocity joint 13 that transmits at constant velocity
And one or both of the constant velocity joints 13
One of them is composed of a constant velocity ball joint 15, and this constant velocity ball joint 15 is fixed to the working machine 2 side or the tractor 1 side, and a wide angle guide 15c is provided at the inlet portion to form a plurality of ball guide grooves on the inner peripheral surface. The inner race 15b having a plurality of balls on the outer periphery is different from the outer race 15a having
Is elastically supported by a spring 17 via a slide transmission shaft 14 so that the inner race 15 of the constant velocity ball joint 15 can be mounted on the tractor 1 when the working machine 2 is mounted.
Power can be transmitted at a constant speed simply by moving b, and since it does not require strict centering, it is versatile. Further, the power transmission function of the power transmission mechanism 12 can be easily released, and the work machine 2 can be easily attached and detached, and the power transmission can be connected and disconnected easily and quickly.

[Brief description of drawings]

FIG. 1 is a schematic side view of a working machine mounting apparatus showing an embodiment of the present invention, FIG. 2 is a side view in which a constant velocity ball joint is partially sectioned, and FIGS. 3 and 4 are A- in FIG. Line A and B
-B is a sectional view taken along line B, FIG. 5 is a side sectional view of a constant velocity joint using needle bearings and rollers, and FIGS. 6 and 7 are taken along lines CC and DD of FIG. FIG. 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 (wide-angle constant velocity joint), 14…
… Sliding power transmission shaft, 14a …… Sliding shaft, 15 …… Working machine side bending power transmission part (constant velocity ball joint) 15a …… Outer race, 15b …… Inner race, 15c …… Wide angle guide, 16 ……
Bearing, 16a ... Outer race, 17 ... Spring, 18 ...
… Operating lever, 19 …… Locking rod, 20 …… Guide groove, 21 ……
Needle bearings, constant velocity joints using rollers,
21a …… Outer race, 21b …… Inner race, 21c ……
Needle bearing, 21d …… Roller, 21e …… Wide-angle guide.

Claims (1)

(57) [Claims] 1. A work machine (2) is movably connected to a tractor (1) via a link mechanism (3) having an automatic connection function, and the tractor (1) is connected to the work machine (2). In a working machine mounting device provided with a power transmission mechanism (12) having a bending transmission portion capable of bending on the (1) side and the working machine (2) side, the power transmission mechanism (12) is , The tractor (1) side, the working machine (2) side, or both, and a constant velocity joint (13) for transmitting the rotational power at a constant velocity is arranged in the bending transmission portion, and one or both of the above. One of the constant velocity joints (13) of the above is constituted by a constant velocity ball joint (15), and this constant velocity ball joint (15) is fixed to the working machine (2) side or the tractor (1) side, and is attached to the inlet part. A wide-angle guide (15c) is provided for multiple balls on the inner peripheral surface. An inner race (15b) having a plurality of balls on its outer periphery is elastically supported by a slide transmission shaft (14) so as to be insertable and removable with respect to an outer race (15a) having a guide groove, via a spring (17). A device for mounting a work machine on a tractor, which is characterized in that