JPH01285105A - Device of connecting tractor to working machine - Google Patents

Abstract

PURPOSE:To readily connect a power transmission shaft to a power shaft in a device of connecting a tractor to a working machine, by elastically and movably in the shaft direction holding a supporting shaft to bear the tip part of an expansion joint connected to PTO shaft. CONSTITUTION:A connecting frame 14 linking a top link 9 to low links 7 is equipped with an upper coupling plate 19 and lower coupling plates 16 to link an upper connecting pin 41 at the side of a working machine to lower connecting pins 45. A cross joint 12 of an expansion joint shaft linked to PTO shaft of a tractor is supported on the connecting frame 14. The cross joint 12 can be moved backward by rotating a handle 30 and can be connected to an input shaft 38 of a working machine 4. Since a supporting part is elastically borne by a spring 34, the centers of the cross joint 12 and the input shaft 38 are readily made coincident.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coupling device for coupling a tractor and a working machine with one touch.

(Prior Art) As a device for connecting a tractor and a working machine with a one-touch operation, devices described in, for example, Japanese Unexamined Patent Publication No. 58-216605 and Japanese Utility Model Application No. 55-123205 are known.

In this conventional system, not only the body of the working machine is connected to the tractor with one touch, but also the power transmission device of the tractor and the working machine can be connected with one touch.

That is, the method described in the above-mentioned Japanese Patent Application Laid-open No. 58-216605 discloses a method for moving the shaft end of the output shaft of a rotary power transmission mechanism in which an input shaft is connected to a power take-off shaft provided on the main machine side for transmission. A shaft end portion of an input shaft provided on a body of a work machine, which is mounted on a shaft rack by a freely movable holding member, and the holding member is connected to the machine by sliding along the axial direction of the output shaft. The guide frame is set to move forward and backward relative to the machine, and is slidably fitted into a guide frame that is supported by the machine frame of this machine or the machine frame assembled to this machine.
A connection and coupling device for a rotary power transmission mechanism in an agricultural and earthworking machine, characterized in that a working mechanism such as a handle or a hydraulic mechanism that moves in the axial direction is connected to the holding member.

In addition, the one described in Japanese Utility Model Application Publication No. 55-123205 has a quick coupler frame pivotally attached to the rear end of a three-point link hitch via a pin in the vehicle width direction, and attached to a PTO shaft that protrudes rearward from the rear axle case. The front ends of the drive shafts are connected via a universal joint, and the rear yoke of the universal joint at the rear end of the drive shaft is supported on the quick coupler frame, and a longitudinal direction is connected between the rear ends of the rear yaws and the front end of the work equipment input shaft. A work machine coupling device characterized in that a clutch is provided that connects by approaching the work machine, and a clamp mechanism is provided between the quick coupler frame and the work machine that engages by approaching the work machine in the front and back direction.

(Problems to be Solved by the Invention) The conventional work equipment coupling device described above has problems in aligning the power transmission shaft and the input shaft when removably connecting the power transmission shaft on the tractor side and the input shaft on the work equipment side. There was a problem that the bonding process was not carried out smoothly and the joining process was difficult.

In other words, because the conventional type does not have a mechanism for aligning the power transmission shaft and the input shaft, the holding member must be positioned accurately with respect to the frame, which increases manufacturing costs. When the shaft misalignment occurred, it became difficult to connect.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems by providing an alignment mechanism capable of absorbing misalignment between the power transmission shaft and the input shaft. The tractor and work equipment coupling device has the following features.

A connecting frame is attached to the tips of the top link and lower link, which are pivotally connected to the tractor in the vertical direction, and the retaining part provided on this frame and the connecting part provided on the work equipment side can be freely attached and detached. While connected, the tractor's P
A support part that rotatably supports the tip of the telescopic joint shaft connected to the TO shaft is supported by the frame so as to be movable in the axial direction, and the axial movement of the support part rotates the end of the telescopic joint shaft In a coupling device that is detachably coupled to an input shaft of a work machine, the coupling frame is provided with a guide rail extending in the front-rear direction, a slider movable in the front-rear direction is fitted to the guide rail, and the slider drive means for moving the movable member in the front-back direction, a support bracket is provided on the mover, and an elastic member is provided on the support bracket,
The support portion is elastically supported by the elastic member.

(Function) In the present invention, in order to connect the tractor and the working machine,
Bring them both closer to each other. This approach connects the retaining portion provided on the frame and the connecting portion of the working machine. Then, by moving the support portion toward the working machine, the telescopic joint shaft and the input shaft are coupled.

The support portion is moved toward the working machine by moving the movable element along the guide rail using a driving means. Since the support part is supported by the support bracket via the elastic member, the axis of the end of the telescopic joint rotatably supported by the support part and the axis of the input shaft of the work machine are aligned. Even if misalignment occurs, the misalignment is absorbed by the elastic member, and the two are smoothly connected.

(Example) Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 5, a rotary tiller 4 is detachably connected to the rear of the vehicle body 2 of the tractor 1 via a connecting device 3 according to the present invention.

A hydraulic device 5 is provided on the rear upper surface of the vehicle body 2 of the tractor 1, and the hydraulic device 5 is provided with a pair of left and right lift arms 6 that swing vertically by hydraulic pressure. A pair of left and right lower links 7 are pivotally supported at both lower portions of the vehicle body 2 so as to be swingable in the vertical direction. This lower link 7
and the lift arm 6 are interlocked and connected by a lift rod 8.

A top link 9 is pivotally supported at the upper center of the rear end surface of the vehicle body 2 so as to be swingable in the vertical direction. Furthermore, a PTO shaft 10 protrudes from the center of the lower part of the rear end surface of the vehicle body 2. This P.T.
The O-shaft 10 is rotationally driven by an engine (not shown). A telescopic joint shaft 11 is connected to this PTO shaft 10. This expandable joint shaft 11 has cross joints 12 at both ends thereof, and both cross joints 12 are connected by a telescopic power transmission shaft 13 that is splined. This transmission shaft 13 is covered with a non-rotatable cover cylinder (not shown).

As shown in detail in FIGS. 1 and 2, the connecting device 3 has a gate-shaped connecting frame 14, and the frame 14 is formed by bending a square pipe. A pin 15 having a horizontal axis in the left and right direction is fixed to the left and right lower ends of the portal frame 14, and the rear end of the lower link 7 is pivotally attached to the pin 15. Also this frame 14
A pair of left and right lower connecting plates 16 are provided at the lower end portions on both the left and right sides of the
It is fixed in a protruding shape at the rear. A pair of upper and lower guide surfaces 17 that widen and open toward the rear are formed at the rear end of the lower connecting plate 16, and the front ends of the upper and lower guide surfaces 17 are connected by an arcuate surface 17a. This lower connecting plate 16 constitutes a lower retaining portion.

As shown in FIG. 5, a lock plate 18 is pivotally supported on a pin 15 at the lower end of the frame 14 so as to be rotatable in the vertical direction. This lock plate 18 is connected to the lower connecting plate 1.
It is located on the side of 6.

An upper connecting plate 19 is fixed to the upper central part of the frame 14, and the rear end of the top link 9 is pivotally attached to the front part of the upper connecting plate 19. An engagement recess 20 with an upward opening is provided at the rear of the upper connecting plate 19. This engagement recess 20 constitutes an upper engagement section.

A pair of left and right brackets 21 are fixed to the left and right center portions of both left and right sides of the gate-shaped frame 14 so as to project downward. Guide rails 22 are fixed to the pair of left and right brackets 21 in parallel to each other in the front-rear direction. This guide rail 22 has a U-shaped cross section, and is arranged so that the U-shaped grooves face each other.

A slider 23 is arranged between the pair of left and right guide rails 22, rollers 24 are attached to both sides of the slider 23, and the rollers 24 fit into the U-shaped grooves of the guide rail 22 so as to be movable in the front and rear directions. are doing.

A nut 25 is fixed to the upper surface of the moving element 23, and a screw rod 26 is screwed into this nut 25. This screw rod 2
6 is rotatably and axially movably held by a bush 28 fixed to a horizontal rod 27 provided on the connection frame 14. A universal joint 29 is attached to the front end of this threaded rod 26.
An operating handle 3o is connected thereto. By rotating the operating handle 30 and rotating the threaded rod 26, the movable element 23 is moved in the front-rear direction. Therefore, the movable member 23 can be moved by using these operation handles such as the 3°
A driving means for moving the is configured.

A gauge scale 31 is provided on the side surface of the guide rail 22 to determine the moving distance of the mover 23.

A support bracket 32 is fixed to the mover 23 in a hanging manner. This support bracket 32 is provided with a hole 33 that penetrates in the front-rear direction.

A coil spring 34, which is an elastic member, is fixed to the support bracket 32 concentrically with the hole 33 thereof. A support portion 35 is held by this coil spring 34.

That is, the support part 35 is formed into a cylindrical body, and the cross joint 12 of the telescopic joint shaft 11 is rotatably held on the inner peripheral part of the support part 35 via a bearing 36. A coil spring 34 is inserted into the hole 33 of the bracket 32 and fixed to the support bracket 32.
It is supported by.

The coil spring 34 is formed as a tapered coil spring, and its large diameter portion is fixed to the support bracket 32, and its small diameter portion is fixed to the outer peripheral surface of the support portion 35.

The working machine 4 has an input gear box 37, and an input shaft 38 protrudes from the front surface of the gear box 37. This input shaft 38 is removably fitted into a spline 39 of the cross joint 12 supported by the support portion 35 .

A top mast 40 is fixed to the top of the input gearbox 37 so as to project forward, and an upper connecting pin 41 is attached to the front end of the top mast 40. The upper connecting pin 41 engages with the engaging recess 20 of the upper connecting plate 19 in a detachable manner. Thus, this pin 41 constitutes an upper connecting portion on the working machine side.

Support arms 42 are attached to both the left and right sides of the input gearbox 37, and a forward-protruding lower connecting bracket 43 is fixed to the support arms 42. This bracket 43 and the top mast 4° are connected by a connecting rod 44. A lower connecting bin 45 having a horizontal axis in the left-right direction is fixed to the front part of this bracket 43. The lower connecting pin 45 is guided by the guide surface 17 of the lower connecting plate 16, comes into contact with the lock plate 18, and can be freely engaged and detached by rotating the lock plate 18 downward. Thus, this pin 45 constitutes a lower connecting portion on the working machine side.

The lower connecting bracket 43 supports a support 47 of the front gauge wheel 46 so as to be movable and fixed in the vertical direction.

Side plates 48 are fixed to both ends of the support arm 42,
A tilling shaft is supported between the lower portions of the both side plates 48, forming a low tilling section 49.

According to the embodiment of the present invention, what is shown in FIGS. 1 and 5 is the working machine connected state, and what is shown in FIG. 3 is the work machine disconnected state.

To change the state shown in FIG. 3 to the state shown in FIG. 1 or FIG. let At this time, the mover 23 is positioned at the frontmost position (on the left side in FIG. 3) by the driving means.

Next, the hydraulic device 5 is operated to rotate the lower link 7 upward. This upward rotation causes the frame 14 to rise, and this rise lifts the upper connecting pin 41 upward. Since the working machine 4 is lifted by lifting the upper connecting pin 41, the working machine 4 moves forward around the upper connecting pin 41 due to the positional relationship of its center of gravity.

By this forward movement, the lower connecting pin 45 is guided by the guide surface 17 of the lower connecting plate 16, and pushes down the lock plate 18 to engage with the arcuate surface 17a thereof, and
The lock plate 18 prevents it from being pulled out backwards.

Thus, the body of the working machine 4 is connected to the frame 14 on the tractor 1 side. In this state, the cross joint I2 and the input shaft 38 are not yet connected.

In this state, a slight gap is formed between the end surface of the cross joint 12 and the tip surface of the input shaft 38. However, the axial center of the cruciform joint 12 and the axial center of the input shaft 38 are almost aligned (
(See Figure 4).

Next, the operation handle 30 is rotated to move the mover 23 backward. As a result, the support portion 35 moves rearward, and the spline 39 of the cross joint 12 and the input shaft 38 are coupled together (see FIG. 1).

When the cross joint 12 and the input shaft 38 are connected, if there is a misalignment between them, the cross joint 12 and the input shaft 38 will collide.
5 is elastically supported by the coil spring 34, the misalignment between the two is absorbed by the coil spring 34, and the cross joint 12 and the input shaft 38 are smoothly connected.

Incidentally, the removal of the working machine 4 is performed by the reverse procedure of the interlocking connection described above.

Note that the present invention is not limited to the above embodiments.

(Effects of the Invention) According to the present invention, since the support part is elastically supported by the elastic member, even if there is a misalignment between the transmission shaft and the input shaft, the misalignment is absorbed by the elastic member, so that the transmission shaft and the input shaft This allows for smooth connection with the input shaft and facilitates the connection work.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a rear view of the same, Fig. 3 is a side view showing the state before the tractor and the work machine are connected, and Fig. 4 is the tractor and the work machine. FIG. 5 is a side view showing the state after the frame is coupled and before the transmission shaft and input shaft are coupled. FIG. 5 is a side view showing the overall configuration of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Tractor, 3...Coupling device, 4...Work machine, 7...Lower link, 9...Top link, lO
... PTO shaft, 11 ... Expandable joint shaft, 14 ...
- Connection frame, 16... Engaging portion, 22... Guide rail, 23... Mover, 25, 26. 28... Drive means, 32... Support bracket, 34... Elastic member , 35... Support part, 38... Input shaft, 41.
45...Connection part. Patent applicant: Kubota Iron Works Co., Ltd. No. 7, No. 21A

Claims (1)

[Claims] 1) A connecting frame is attached to the tips of a top link and a lower link that are pivotally connected to the tractor in a vertically rotatable manner, and an engaging portion provided on the frame and a connecting frame provided on the working machine side are attached. A support part rotatably supports the distal end of the telescopic joint shaft connected to the PTO shaft of the tractor, and is supported by the frame so as to be movable in the axial direction. In a coupling device in which an end of an extensible joint shaft and an input shaft of a working machine are detachably coupled by axial movement of a support part, the coupling frame is provided with a guide rail extending in the front-rear direction, and the guide rail is provided with a guide rail extending in the front-rear direction. A movable element that is movable in the front-rear direction is fitted, a driving means for moving the movable element in the front-back direction is provided, a support bracket is provided on the movable element, and an elastic member is provided on the support bracket,
A coupling device for a tractor and a working machine, characterized in that the support portion is elastically supported by the elastic member.