JPH04316417A - Connecting apparatus for tractor working machine - Google Patents

Abstract

PURPOSE:To perform interlocked operation for holding and fixing a universal joint of a transmission shaft to a hitch body with a joint hook by operating a hitch hook lever to fix the joint of the hitch body and a work body. CONSTITUTION:A universal joint 10 at the tip end of a transmission shaft 9 is fixed with a joint holder 11 to a hitch body 4 at the tip of a top link 2 and a lower link 3. When the hitch body 4 is brought close to the joint part of a work body 6 keeping the above state, the universal joint NO is fit into the input shaft of the work body 6. When these parts are not directly fit with each other, a freely swivellable joint holder 11 is connected to the universal joint 10 and the input shaft. The transmission shaft 9 or a work machine 5 is turned by hand keeping the above state to fit the universal joint 10 into the input shaft.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling device for a tractor working machine that facilitates attachment and interlocking of the working machine by means of a hitch attached to the end of a three-point linkage mechanism of a tractor body.

0002

[Prior Art and Problems to be Solved by the Invention] The technology disclosed in Japanese Patent Application Laid-Open No. 2-128610 is such that the left and right sides of a hitch body connected to a top link and a lower link are engaged with connecting pins on the work machine side. In addition, a hitch hook lever is provided to maintain the connected position, and a universal joint at the tip of the transmission shaft is detachably held in the center of the hitch body.

In this type of coupling device, when the connecting pin on the work machine side is connected to the hitch body using the hitch hook lever, the universal joint of the transmission shaft and the input shaft on the work machine side are fitted together. They are connected and ready to transmit power, but it is difficult to fit the universal joint and input shaft accurately, and it is necessary to rotate the universal joint and the transmission part on the work equipment side by hand to ensure proper connection. Therefore, it is time-consuming.

0004

[Means for Solving the Problems] In the present invention, the left and right sides of a hitch body 4 connected to a top link 2 at the rear of a vehicle body 1 and a pair of left and right lower links 3 are connected to both sides of a work body 6 on a work machine 5 side. A hitch hook lever 8 is provided that engages with the pin 7 to maintain the connected position, and a universal joint 1 at the tip of the transmission shaft 9 is provided on the inside of the hitch body 4.
A joint holder 11 that can detachably hold the universal joint 10 and swing back and forth, and a joint hook 12 that fixes the holding position of the universal joint 10 with respect to the hitch body 4 are provided, and these hitch hook levers 8 and joint hooks 12 are provided. This is a configuration of a coupling device for a tractor working machine, which is characterized by being operated in conjunction with each other.

[0005]

[Operation and Effects of the Invention] A universal joint 10 at the tip of the transmission shaft 9 is held by a joint holder 11 in the hitch body 4 at the tip of the top link 2 and lower link 3. When the hitch body 4 approaches the connecting portion of the work body 6 in this state, the universal joint 10 is fitted to the input shaft of the work body 6. When these are not directly fitted, the swingable joint holder 11 is pushed and swings by the contact between the universal joint 10 and the input shaft. In this state, the universal joint 10 and the input shaft are fitted together by turning the power transmission shaft 9 or the working machine 5 side by hand.

Therefore, when the hitch hook lever 8 is rotated, it is engaged with the connecting pin 7 of the work body 6, thereby connecting and fixing the work body 6 to the hitch body 4, and interlocking with the operation of the hitch hook lever 8. Then, the joint hook 12 fixes the universal joint 10 to the hitch body 4. In this way, the hitch body 4 and the work body 6 are connected and fixed, and the universal joint 10 of the transmission shaft 9 is connected to the input shaft of the work machine 5. Since the connection and fixation of the hitch body 4 and the work body 6 and the connection and fixation of the universal joint 10 to the input shaft are performed in conjunction with lever operation, the fitting and connection of the universal joint 10 can be smoothly and effortlessly performed. This simplifies the work equipment connection operation.

[0007]

[Example] The tractor body 1 includes a steering handle 1
3, the front wheels 14 and the rear wheels 15, which can be steered freely,
It is a four-wheel drive mode in which the engine 16 mounted in the front is used for transmission drive, and the transmission case 18 behind the driver's seat 17 has a
A pair of left and right lower links 3 and a top link 2 that are raised and lowered by the lift arm 19 are attached, and the power take-off shaft 20 is attached.
has been established. A hitch body 4 for connecting the working machine 5 is attached across the rear ends of the lower link 3 and the top link 2, and a transmission shaft 9 for transmitting the working machine 5 is attached to the power take-off shaft 20.

The hitch body 4 is a round pipe formed into an inverted U-shape, and has a hook 2 at its upper end that engages to scoop up a hook pin 22 at the upper end of the mast 21 of the working machine 5.
3 and connects the top link 2.
4 can be detachably attached. This connection bracket 24 is
A pair of left and right plates are connected by a connecting plate to create a cross section H.
As a form, the attachment base of the hook 23 to the hitch body 4 is fitted so as to sandwich it, and the attachment bolt 25 is inserted through this fitting part from side to side to attach it, and the tip of the top link 2 is fitted to the front end. They can be connected rotatably by inserting the connecting pin 26 therethrough. The connecting bracket 24 is available in a plurality of types A and B with different standards in which the position of the pin hole 28 of the connecting pin 26 relative to the bolt hole 27 of the mounting bolt 25 is different, and is adapted to different types of tractors. Particularly in vehicles where the vehicle height changes greatly due to changes in wheel diameter, the connection pin 2 can be adjusted by selecting the connection bracket 24.
It is better to install something that adapts the height position of 6.

A connecting plate 30 is integrally provided at the lower outer end of the hitch body 4 and has a pin groove 29 that fits into the connecting pin 7 protruding from both the left and right sides of the work body 6. A guide surface with an outwardly opened end is formed to facilitate guiding of the work body 6. A lower link pin 31 is made to protrude laterally from the outer lower end of the connection plate 30, and the rear end of the lower link 3 can be fitted into the lower link pin 31 for connection.

The hitch hook lever 8 is connected to the connecting plate 3.
0 and the lower link 3, and has a hook 32 that engages with the connecting pin 7 that is fitted into the pin groove 29 of the connecting plate 30. 8 to the rear side closes the pin groove 29 and prevents the connecting pin 7 fitted therein from coming out.

[0011] The joint holder 11 is attached to the hitch body 4.
The universal joint 10 is provided on the inner side of the lower end, and is suspended so as to be swingable back and forth using the upper end as a support shaft 33, and on the rear side of the lower part, the universal joint 10 is rotatable and protrudes from both left and right sides of the joint case 34 that covers the outer periphery. A holder groove 36 is formed into which a holder pin 35 is fitted and supported, and the left and right joint holders 11 are integrally formed into a gate shape. The universal joint 10 is supported by fitting the holder pin 35 into the holder groove 36 of the joint holder 11.
It is suspended from the hitch body 4 in a state where it can freely swing back and forth. Reference numeral 37 denotes a reinforcing member that integrally connects the left and right side portions of the hitch body 4. A supporting piece 38 projects forward from this reinforcing member 37 to support the support shaft 33 of the portal-shaped joint holder 11.
It is hung so that it can rotate freely.

Further, this joint holder 11 is provided with a joint hook 12 so that the back and forth swinging of the joint holder 11 can be fixed to the hitch body 4. A joint hook 12 is provided at the outer lower part of the joint holder 11 so as to be rotatable around a hook shaft 39, and the joint hook 12 rotates downward from above the groove opening of the holder groove 36 and projects inward from the hitch body 4. When the joint holder 11 is pulled toward the hitch body 4 from the front and fixed, the universal joint 10 held by the joint holder 11 is engaged with the lock pin 40 that is It is spline-fitted to the side input shaft 41 and becomes ready for transmission.

The joint holder 11 is urged toward the rear side of the hitch body 4 by a spring 42, and is stopped at a fixed position by a stopper or the like. or,
The hitch hook lever 8 has a toggle spring 43 between it and the joint holder 11, and can spring into a state in which it locks the connecting pin 7 beyond the dead center and a state in which it disengages from the connecting pin 7. The left and right joint hooks 12 and the hitch hook lever 8 are connected by an interlocking rod 44, and by rotating the hitch hook lever 8 toward the rear working machine 5, The joint hook 12 is provided so as to be rotated rearward and engaged with the lock pin 40. In this state, the joint holder 11 cannot be swung forward against the spring 42, but the joint hook 12 can be rotated by rotating the hitch hook lever 8 in the opposite direction of arrow C. When the joint holder 11 is removed from the lock pin 40, the joint holder 11 can be rotated forward against the spring 36. 45
is a connecting member that integrally connects the left and right joint holders 11, and can receive the universal joint 10 on the upper side.

The toggle spring 43 springs the hitch hook lever 8 into a state where it is closed toward the pin groove 29 side and a state where it is opened forward. As the connecting pin 7 approaches to be fitted (arrow D in FIG. 6), this hitch hook lever 8
is pushed slightly forward around the lower link pin 31, and the pin groove 29 by the hook 32 is opened, so that the connecting pin 7 is automatically fitted into the pin groove 29. When the connecting pin 7 is fitted into the pin groove 29, the hook 32 is closed and the connected state of the work body 6 can be fixed.

For example, when a tilling device is illustrated, the working machine 5 includes a tilling transmission case as a working body 6, a splined input shaft 41 protruding from the front side, and a transmission mechanism in the working body 6 by rotation of the input shaft 41. Cultivate through the claws 46
The tilling action is performed by transmission driving a tilling shaft 47 on which a tilling shaft 47 is disposed. Connecting pins 7 are provided on both left and right sides of the input shaft 41 to fit into the pin grooves 29 of the connecting plate 30 and to engage the hook 32 of the hitch hook lever 8. The mast 21 projects above the work body 6, and is provided with a hook pin 22 at its upper end that can be engaged with the hook 23, and an adjustment handle 49 for adjusting the height of the gauge wheel 48.

The transmission shaft 9 interlocks between the power take-up shaft 20 and the input shaft 41, and has a universal joint 10 at the front and rear ends of a telescoping shaft 50 that can be retracted and retracted by spline fitting. are spline-fitted to the power take-off shaft 20 and the input shaft 41 so that they can interlock with each other. A cylindrical cover 51 is provided on the outer periphery of the transmission shaft 9, and the universal joint 10 also has a bearing 5.
2 is rotatably supported within a joint case 34, and has a holder pin 35 on the outer periphery of this joint case 34 that is engaged with the joint holder 11.

The hitch body 4 constructed in this way is
Fit the lower link 3 to the lower link pin 31, connect the top link 2 to the connecting bracket 24 with the pin 26, fit the universal joint 10 at the front end of the transmission shaft 9 to the power take-off shaft 20, and fit the universal joint 10 at the front end of the transmission shaft 9 to the power take-off shaft 20. The holder pin 35 of the housing 34 of the joint 10 is fitted into the holder groove 36 of the joint holder 11 and supported.

At this time, since the left-right distance between the joint holders 11 is narrower than the width of the left and right holder pins 35, the holder pins 35 are inserted from the front side to the rear side with the holder pins 35 facing up and down, and are supported and guided by the lower connecting member 45. While moving it forward, the left and right holder pins 35 are fitted into the holder grooves 36 of each joint holder 11. Further, each hitch hook lever 8 rotates in the opposite direction of arrow C, and the connecting plate 30
It is also possible to leave the pin groove 29 open.

The hitch body 4 attached to the top link 2 and lower link 3 in this manner is moved up and down by the up and down movement of the lift arm 19 with the hitch body 4 facing the front of the work body 6 of the work machine 5. The hook 23 of the body 4 scoops up and engages the hook pin 22 on the working machine 5 side, and the working machine 5 is lifted off the floor. Work equipment 5
When the input shaft 41 is floated up, the input shaft 41 moves around the hook pin 22 due to its own weight toward the universal joint 10, and is spline-fitted with the input shaft 41. If the degree of fitting between them is insufficient, both 41 and 10 are brought into a fitted state by turning the tilling claw 46 by hand or by loosely engaging and rotating the clutch of the power take-off shaft 20. At this time, due to the action of the spring 42 that pulls the joint holder 11,
The universal joint 10 is springed so as to be always fitted to the input shaft 41 side. Further, the left and right connecting pins 7 of the work body 6 are also fitted into the pin grooves 29.

Universal joint 10 is attached to input shaft 41.
When the left and right hitch hook levers 8 are fitted together, if they have been previously operated in the opposite direction of arrow C (FIG. 7), they are rotated in the direction of arrow C (FIG. 8). The hook 32 of the hitch hook lever 8 is engaged with the connecting pin 7 fitted in the pin groove 29 to prevent the connecting pin 7 from coming off. In conjunction with the hitch hook lever 8, the joint hook 12 is rotated around the hook shaft 39 via the rod 44, and the lock pin 40 of the hitch body 4 is moved over the holder pin 35 fitted into the holder groove 36. The joint holder 11 and the universal joint 10 are fixed in position with respect to the hitch body 4. At this time, the toggle spring 43 maintains the connected position of the hitch hook lever 8.

When connecting the work bodies 6 with the hitch hook lever 8 previously rotated in the direction of the arrow C, the hook 32 is opened and inserted into the pin groove 29 by the approach D of the connecting pin 7. Since they are fitted and engaged by the return of the hook 32, the engagement of the connecting pin 7 can be automatically fixed without operating the hitch hook lever 8.

[0022] Furthermore, when disconnecting the working machine 5, the operation in reverse to the above may be performed. 10 and 11, the difference from the above example is that the joint holder 11 is prevented from steadying in the longitudinal direction by a lock pin 53, and the hitch body 6 and the joint holder 11 are overlapped vertically at the fixed position. A vertical pin hole is formed between the lock plates 54 and 55, and a pin holder 56 of the hitch body 6 is provided with a pin hole.
A universal joint of the joint holder 11 is provided by providing a lock pin 53 that is movable up and down and always springing downward by a spring 59, and by inserting this lock pin 53 into the pin hole when the lock plates 54 and 55 overlap. 10 holding positions are fixed. Also, this lock pin 5
The lock can be released by pulling out upward against the spring 59. A handle 57 is horizontally projected from the upper end of the lock pin 53, and when the lock pin 53 is pulled upward, the handle 57 is received by a receiving seat 58 provided on the hitch body 4. Can maintain release posture.

[Brief explanation of drawings]

The figure shows an embodiment of the invention.

FIG. 1 is an isolated perspective view of a work equipment connection section.

FIG. 2 is a side view of a portion thereof.

[Fig. 3] Its rear view.

FIG. 4 is a perspective view of a portion thereof.

FIG. 5 is a partial plan view.

FIG. 6 is a side view showing some functions.

FIG. 7 is a side view showing some functions.

FIG. 8 is a side view showing some functions.

FIG. 9 is an overall side view.

FIG. 10 is a side view showing a partial embodiment.

FIG. 11 is a side view thereof.

[Explanation of symbols]

1 Vehicle body 2 Top link 3 Lower link 4 Hitch body 5 Work equipment 6 Working body 7 Connecting pin 8 Hitch hook lever 9 Transmission shaft 10 Universal joint 11 Joint holder 12 Joint hook

Claims (1)

[Claims] Claim 1: The left and right sides of the hitch body 4, which are connected to the top link 2 at the rear of the vehicle body 1 and the pair of left and right lower links 3, are connected by engaging with connecting pins 7 on both sides of the work body 6 on the work equipment 5 side. A hitch hook lever 8 is provided to maintain the hitch position, and a joint holder 11 that removably holds a universal joint 10 at the tip of the transmission shaft 9 and can swing back and forth is provided on the inside of the hitch body 4. A coupling device for a tractor working machine, characterized in that a joint hook 12 is provided to fix the holding position of the universal joint 10 with respect to a body 4, and the hitch hook lever 8 and the joint hook 12 are operated in conjunction with each other.