JPH084816Y2 - Tractor work equipment coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a work implement connecting device for a tractor.

(Prior Art) A work machine connecting device used when connecting a working machine, for example, a rotary device, to the rear of a tractor via a three-point link mechanism has a hook portion and a pair of left and right connections at a tip of the three-point link mechanism. A connecting frame having upper and lower parts is provided, and the three-point link mechanism is standardized by the connecting frame, while the hooked part and the connecting part of the connecting frame are engaged and disengageably engaged and connected. There is a quick type in which a part is provided in a rotary device.

In this type of coupling device, a holding cylinder that rotatably holds the rear end portion of the PTO shaft of the tractor is movably provided in the coupling frame,
There is a structure in which the input shaft of the rotary device is detachably fitted to the universal joint shaft when the rotary device is attached or detached, and the power transmission system can be inserted or removed at the same time.

In this case, when the universal joint shaft and the input shaft are in a fitted state, the retaining cylinder regulates the looseness in the pull-out direction by the restrictor, and the unexpected movement of the universal joint shaft and the input shaft that accompanies the lifting and lowering of the rotary device. To prevent it from coming off.

(Problems to be solved by the invention) The restrictor must be released when connecting the rotary device, and if you forget to release it and proceed to the connecting operation, each part will be overloaded and damage to the device will occur. Connect

However, conventionally, no measures have been taken to prevent forgetting to release the restraint.

In view of the above point, the present invention aims to prevent the working machine from being connected unless the restraint tool is released and to easily confirm whether the restraint tool is in the regulated position or the released position. To do.

(Means for Solving the Problem) The present invention is designed so that the connecting frame 37 of the three-point link mechanism 24 is attached to the working machine 30.
The hook portion 43 for releasably hooking the engaged portion 35, and the connected portion 36 of the working machine 30 releasably engages when the hook portion 43 hooks the engaged portion 35. A connecting cylinder 44 is provided on the upper and lower sides, and a holding cylinder 54 that rotatably holds the universal joint shaft 48 is provided on the connecting frame 37 side so that the input shaft 33 is inserted into and removed from the universal joint shaft 48 when the work machine 30 is attached and detached. In the work machine coupling device of the tractor, which is movably provided, the restricting tool 63 for restricting the free movement of the holding cylinder 54 in the disengagement direction in the fitted state of the input shaft 33 and the universal joint shaft 48 is provided in the hook portion 43. A checker 71 for restraining the engagement of the engaged portion 35 of the work machine 30 is provided on the upper part of the work tool 30. When the restraint 63 is in the release position B, the restraint 71 is in the release position D, and the restraint 63 is in the restraint position A. In this case, the restraint device 71 and the restraint device 63 are interlocked and coupled so that the restraint device 71 is located at the restraint position C respectively.

(Operation) When connecting the working machine 30, first, the restricting tool 63 is set to the release position B, and the holding cylinder 54 is allowed to move freely. This time,
Since the restraint device 71 is in the release position D in conjunction with the restraint device 63,
With the hook portion 43, the engaged portion 35 of the working machine 30 can be hooked and the connecting operation can be started.

When the release of the restricting tool 63 is forgotten, the restraint tool 71 is in the restraint position C and restrains the engaged portion 35 from engaging with the hook portion 43. Therefore, unless the restricting tool 63 is released, the working machine 30 cannot be connected and damage to the device can be prevented.

In addition, since the restraint 71 is linked to the restraint 63, the restraint
It is possible to easily confirm whether or not the restricting tool 63 is in the released state by the position of 71.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 4, a tractor 20 has a rear wheel 21, a driver's seat 22, a hydraulic device 23, a three-point link mechanism 24, and a PTO shaft 25. The three-point link mechanism 24 is a top link 26 and a pair of left and right lower links.
27 and each lower link 27 is connected to a lift arm 29 of a hydraulic device 23 via a lift rod 28.

Reference numeral 30 denotes a rotary device, which includes a rotary machine frame 31, a rotary tilling part 32, etc., and the rotary machine frame 31 has an input case 34 having an input shaft 33 and an engaged upper central part, as shown in FIG. A portion 35 and a pair of connected portions 36 on both left and right sides are provided. The engaged portion 35 and the connected portion 36 are pin-shaped.

37 is a connecting frame that standardizes the rear end of the three-point link mechanism 24, and as shown in FIG.
A reinforcing rod 38 is provided so as to connect the left and right sides of the lower end portion. A connecting plate 39 is provided at the upper center of the connecting frame 37, and a connecting plate 40 and a lower link pin 41 are provided at both left and right ends.

As shown in FIGS. 1 and 3, the top link 26 is connected to the connecting plate 39 by the top link pin 42, and the top plate 26 is engaged with the engaged portion 35 so as to be disengageable from the lower side. The hook portion 43 to be connected is formed with a notch. The lower link 27 is connected to the lower link pin 41. As shown in FIGS. 1 and 3, the connecting plate 40 is formed with a notch in a rear opening shape so as to connect to the connected part 36 so as to engage and disengage from the front side in a detachable manner. At the same time, a lock pin 45 for locking the connected portion 36 engaged with the connecting portion 44 so as not to be pulled out.
A lock mechanism 46 having the above and a sensing member 47 for automatic locking are provided.

48 is a universal joint shaft, which has cross joints 50 and 51 at both ends of a spline structure expansion / contraction part 49. The yoke of the front cross joint 50 is connected and fixed to the PTO shaft 25, and the rear cross joint is also provided. 51
The yoke 52 is rotatably supported by a holding cylinder 54 via a bearing 53 as shown in FIGS. 2 and 3. The holding cylinder 54 is movably inserted into a hole 56 formed in the support plate 56, and is rearwardly moved by a coil spring 59 fitted around the outer circumference of the holding cylinder 54 between the rear end flange portion 58 and the support plate 56. It is elastically supported by being biased to, is movable in the front-rear direction, and is swingable at any angle. The support plate 56 is fixed to the upper and lower wall portions of a mounting plate 60 that is fixed to the central portion of the connecting frame 37. The retaining ring 61 is attached to the front end of the holding cylinder 54.
Is provided, whereby the holding cylinder 54 is retained against the support plate 56. The yoke 52 has a spline hole 62 into which the input shaft 33 is removably fitted, and the spline hole 62
In addition, the input shaft 33 is adapted to be inserted and removed when the rotary device 30 is attached and detached.

Reference numeral 63 designates a restricting tool which, when the input shaft 33 and the yoke 54 are in contact with each other, contacts the flange portion 58 of the holding cylinder 54 to restrict the free movement in the pulling direction (shown by the arrow a in FIG. 2). As shown in FIG. 3, the support plate 56 is pivotally attached to the restriction position A and the release position B at the center of the upper portion of the support plate 56 so as to be switchable in an unstable manner. That is, this regulation tool 63
Is curved outside the coil spring 59 along the holding cylinder 54 in an arcuate cross section, and is pivotally supported by a pin 66 on a bracket 65 at the upper center of the support plate 56 via a bracket 64 at the front end so that the pin 66 can undulate. In addition, the spring 67 is biased so as to enable unstable switching. The springs 67 are U-shaped in a side view, and there are a pair of springs 67 on the left and right. One end of each spring 67 is supported by the support plate 56 via the winding portion 68.
It is wound around the upper pin 69 and locked to the support plate 56, and the other end side is inserted into the spring hooking portion 70 on the central side of the restricting tool 63. Then, the spring 67 is hung from the U-shaped free state, and when the restricting tool 63 is in the restricting position A,
The spring hook 70 is located below the line connecting the pins 64 and 69,
On the contrary, when it is set to the release position B, it is configured to be positioned upward, and can be switched and held at two positions with the line segment as a boundary.

71 is a restraint provided on the upper portion of the hook portion 43,
As shown in FIG. 1, it has a bent portion 72 and a grip portion 73, and is fixed to the upper end of an arc-shaped guide frame 74. Guide frame 74
Is supported and guided by a top link pin 42 so as to be movable up and down, and a bracket 76 on the restrictor 63 via a rod 75.
Is linked to. The restraint device 71 descends to the restraint position C when the restraint device 63 is set to the restraint position A, and rises to the release position D when set to the release position B. The restraint device 71 is located near the hook portion 43 at the restraint position C, and when the hook portion 43 is put under the engaged portion 35 and raised, the engaged portion 35 is bent by the bent portion 72. It is configured to restrain the hook portion 43 from engaging.

In the above configuration, when connecting the rotary device 40, first hold the grip portion 73 and move the restraint device 71 upward to the release position D.
Up to. Then, the restrictor 63 is pinned via the rod 75.
Since it rotates upward around 66 and is held at the release position B by the spring 67, the holding cylinder 54 becomes free to move. Further, the lock pin 46 is pulled up and stopped by the sensing member 47. Next, after retracting the tractor 20, the hydraulic device 23 raises the three-point link mechanism 24 and the connecting frame 37, and the hook portion
The engaged portion 35 of the rotary device 30 is hooked from below by 43. Then, when the three-point link mechanism 24 and the connection frame 37 are further raised, the engaged portion 35 is lifted while the rotary device 30 is being lifted.
Since it rotates around, the pair of left and right connected parts 36 of the rotary device 30 pushes the sensing member 47 to engage with the pair of left and right connecting parts 44 of the connecting frame 37, and the lock pin 46 of the lock mechanism 45 descends. Lock automatically.

On the other hand, when the rotary device 30 rotates, the input shaft 33 coincides with the yoke 52 in the holding cylinder 54 and fits into the spline hole 62 of the yoke 52. In this case, since the restricting tool 63 is in the release position B as shown by the phantom line in FIG. 2, the holding cylinder 54 is movably supported by the coil spring 59, and the misalignment between the input shaft 33 and the yoke 52 occurs. Even if there is, the holding cylinder 54 is oriented in an arbitrary direction, the axes of both are easily aligned, and the input shaft 33 is fitted into the yoke 52.

When the input shaft 33 is fitted, the gripper 73 is held to lower the restraint tool 71 to the lower restraint position C, and the restraint tool 63 is tilted to the restraint position A as shown by the solid line in FIG. Regulate the movement of. That is, when the holding tool 54 tries to move forward when the restraint device 63 is tilted to the restraint position A, the flange portion at the rear end is moved.
58 contacts the rear end of the restraint 63, which causes the holding tube 54 to
Is regulated. Therefore, when the rotary device 30 is lowered under load during cultivating work, the holding cylinder 54 may come off against the coil spring 59 even if the expansion / contraction part 49 is difficult to expand due to a large frictional resistance. The input shaft 33 can be prevented from being separated from the yoke 52 without moving in the direction.

If the restraint device 63 is forgotten to be released, the restraint device 71 is located at the restraint position C near the hook portion 43, and therefore, even if the hook portion 43 is put under the engaged portion 35 and lifted, Part 72 is the engaged part
Hit 35 and guide you backwards. Therefore, since the engaged portion 35 is not hooked to the hook portion 43 and cannot be connected, damage to the device can be prevented.

Further, since the restraint device 71 and the restraint device 63 are interlocked with each other, it is possible to confirm whether the restraint device 63 is in the regulated position A or the released position B by looking at the position of the restraint device 71.

Even when the rotary device 30 is removed, the restricting tool 63 and the restraining tool 71 are released.

When the restricting tool 63 is pivotally supported by a pin 66 perpendicular to the axis, as shown in FIG. 2, the restricting tool 63 and the flange portion 58 of the holding cylinder 54 are arranged so that the restricting tool 63 can rotate around the pin 66. It is necessary to secure a relatively large gap b between the and. However, as shown in FIGS. 5 and 6, if a pin 77 is provided on the support plate 56 in parallel with the shaft center and the boss portion 78 of the restricting tool 63 is fitted onto the pin 77, the restricting tool 63 will be inserted into the pin 77. Since it turns around, the gap can be made very small. Therefore, even if the amount of fitting between the yoke 52 and the input shaft 33 is small, they will not come off.

(Effect of the Invention) According to the present invention, the restraint device 71 for restraining the engagement of the engaged portion 35 of the working machine 30 is provided on the upper portion of the hook portion 43, and when the restrictor 63 is in the release position B, the restraint device is provided. The restraint device 71 and the restraint device 63 are interlockingly connected so that the restraint device 71 is located in the restrained position C when the restraint device 71 is in the release position D and the restraint device 63 is in the restrained position A, respectively. The device can be prevented from being damaged due to forgetting to release it, and the state of the restrictor 63 can be easily confirmed by the restraint 71.

(Other Disclosures) FIGS. 7 and 8 show a structure in which the restricting tool 63 is switched between the release position B and the restricting position A in association with the attachment / detachment of the rotary device 30.

A rod 81 is connected to the restricting tool 63 via a bracket 80. The rod 81 is vertically slidably guided by the guide ring 82 of the connecting frame 37, and has an open rear shape so that the engaged portion 35 is disengaged at the upper end of the rod 81 when the hook portion 43 disengages. A sensing unit 83 is provided. In addition, the spring 84 of the restrictor 63
Unstable switching is possible.

According to this configuration, when the engaged portion 35 engages with the hook portion 43, the sensing portion 83 also engages, and the restricting tool 63 via the rod 81.
Is pushed down around the pin 66 to regulate the holding cylinder 54. Therefore,
When the rotary device 30 is connected, it is automatically held by the restraint tool 63.
54 can be regulated.

 The operation is reversed when the rotary device 30 is removed.

[Brief description of drawings]

FIG. 1 is a cutaway side view of essential parts showing an embodiment of the present invention, FIG. 2 is a cutaway side view of a connecting portion of the power transmission system, FIG. 3 is a rear view of the connecting frame portion, and FIG. Is a side view of the same, FIG. 5 is a cutaway side view showing a modified example of the restrictor attachment portion, and FIG. 6 is a rear view of the same section. FIG. 7 is a cutaway side view disclosing another coupling device, and FIG. 8 is a side view of the relevant part. 24 ... Three-point link mechanism, 25 ... PTO shaft, 30 ... Rotary device (working machine), 35 ... Engagement part, 36 ... Coupling part, 37 ... Coupling frame, 43 ... Hook part, 44 ... Coupling part, 48 … Flexible joint shaft, 54…
Holding tube, 63 ... Restrictor, 71 ... Restraint tool, A ... Restricted position, B, D
… Release position, C… restraining position.

Claims (1)

[Scope of utility model registration request] 1. A connecting frame (37) of a three-point link mechanism (24),
A hook part (43) for hooking the engaged part (35) of the working machine (30) in a freely disengageable manner, and the hook part (43) is the engaged part (35).
And a connecting part (44) with which the connected part (36) of the working machine (30) engages in a disengageable manner when the working machine (30) is hooked up and down. ) Is a universal joint shaft (48)
A holding cylinder (54) for rotatably holding the universal joint shaft (48) is provided on the side of the coupling frame (37) so that it can be freely inserted into and removed from the connecting frame (37).
In a work machine coupling device for a tractor, which is releasably provided with a restricting tool (63) for restricting looseness of the holding cylinder (54) in the pulling direction in a fitted state of the input shaft (33) and the universal joint shaft (48), A check device (71) for checking the engagement of the engaged part (35) of the work machine (30) is provided on the upper part of the hook part (43), and the check device (63) is held in the release position (B). The tool (71) is in the release position (D),
The restraint device (71) and the restraint device (63) are interlockingly connected so that the restraint device (71) is located at the restraint position (C) when the restraint device (63) is at the restrained position (A). Working machine coupling device for tractors.