JPH01252203A - Apparatus for coupling tractor and working machine - Google Patents

Abstract

PURPOSE:To decrease the amount of rear overhang of working machine from a lower link and to reduce the area of residual unplowed land, by attaching a lower checking part to a 1st coupler frame. CONSTITUTION:A lower checking part 28 is attached to the 1st coupler frame 20 in order to keep a lower connection pin 31 on the same axis as a lower pivot shaft 26 connecting a lower link 6 and coupler frames 20, 50 or in a state offset from the lower pivot shaft toward the side of tractor 1. In the coupling of the tractor 1 and the working machine 4, the lower connection pin of the coupler frame 50 is positioned closest to the lower pivot shaft to decrease the amount of the rear overhang of the working machine from the lower link.

Description

Detailed Description of the Invention A1 Object of the Invention (1) Industrial Application Field The present invention is: - A three-point linkage mechanism consisting of a wooden top link and a pair of left and right lower links, which is attached to a tractor so as to be movable up and down. a first coupler frame connected to the working machine; and a second coupler frame connected to the working machine; upper parts of the first and second coupler frames include an upper locking part and an upper connection part that can be mutually engaged and disengaged by relative displacement in the vertical direction. The first and second coupler frames each have a lower locking part and a lower connecting pin that engage and disengage each other by relative displacement in the front and back directions at the lower part of the first and second coupler frames. The present invention relates to a connecting device for a tractor and a working machine, in which a hook capable of securing a connecting pin is pivotally supported on a first coupler frame.

(2) Prior Art Conventionally, in such a coupling device, the lower link and the first
The lower pivot that connects the coupler frames and the hook support shaft are commonly used (for example, Utility Model No. 62-91911
(see publication).

(3) Problems to be Solved by the Invention In the conventional connecting device as described above, when connecting the tractor and the working machine, the lower connecting pin inevitably connects the lower link and the first coupler frame. As a result, the rear overhang of the work equipment from the lower link becomes relatively large, which not only requires a large operating force to raise and lower the work equipment using the link mechanism. However, there is a drawback that the turning radius of the working machine becomes large during turning work, which tends to leave uncultivated land (headland).

An object of the present invention is to provide a coupling device for a tractor and a working machine that can eliminate such drawbacks.

B1 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a method for connecting the lower connecting pin between the lower link and the coupler frame when the lower locking portion and the lower connecting pin are engaged. The first coupler frame is characterized in that a lower locking portion is provided on the first coupler frame so as to be held coaxially with the lower pivot to be coupled or offset toward the tractor side from the lower pivot.

(2) Effect According to the above configuration, when the tractor and work equipment are connected, the second
The lower connecting pin of the coupler frame is closest to the lower pivot that connects the lower link and the first coupler frame, thereby reducing the amount of rearward overhang of the work implement from the lower link.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIGS. 1 to 3, a riding type tractor 1 is equipped with a three-point link mechanism 2 at the rear. A working machine 4 such as a rotary tiller is connected to the machine via a coupling device N3.

The link mechanism 2 includes a single wooden L-tube link 5 that is pivotally supported to the vehicle body 1a of the tractor 1 so as to be vertically swingable, and a left and right link that is pivotally supported to the vehicle body 1a below the top link 5 so as to be vertically rockable. It is composed of a pair of lower links 6.degree. 6, and allows the working machine 4 to move up and down with respect to the tractor 1 and tilt left and right.

At the rear of the vehicle body 1a are left and right rear wheels 7 of the tractor 1.
．． An elevating drive shaft 8 parallel to the rotation axis of 7 is rotatably supported, and this elevating drive shaft 8 can be reciprocated by the operation of a hydraulic cylinder (not shown). The base ends of a pair of left and right lift arms 9.9 are fixed to both ends of this elevating drive shaft 8, and their swing ends are connected to lift rods 10, 10.
The lower links 5, 5 are connected to intermediate portions of the lower links 5 through 6'. Therefore, the work implement 4 can be lifted by reciprocating rotation of the lifting drive shaft 8. One of the lift rods 10' is partially constructed of a hydraulic cylinder II and is extendable and retractable, and the working machine 4 can be tilted left and right by the operation of the hydraulic cylinder 11.

The tractor 1 also includes a power take-off shaft 12 below the top link 5 for driving the work implement 4, and a pair of front and rear universal joints 1.3.14 are provided on the power take-off shaft 12.

On the other hand, the work machine 4 includes a gear box 16 from which an input shaft 15 (FIG. 4) connected to the power extraction shaft 12 projects from the front, and a cylindrical case 17 extending from both left and right ends of the gear box 16. 17' and these cylindrical cases 17.
A rotary tiller blade unit 19 is rotatably supported at the lower ends of the chain case 18 and the support legs 18'. In addition, the input shaft 1
A transmission device for transmitting power from the rotary tiller blade unit 19 to the rotary tiller blade unit 19 is housed in the gear box 16, the cylindrical case 17, and the chain case 18. Therefore, by rotating the power extraction shaft 12 using an engine (not shown), the rotary tiller blade unit 19 can be rotationally driven.

Next, the connecting device 3 will be explained with reference to FIGS. 2 to 5.

The tractor 1 includes a front coupler frame 20 (first coupler frame). This front coupler frame 20 includes a gate-shaped main frame 21 having a pair of left and right legs, a cross member 22 having a U-shaped cross section that connects both legs of this main frame 21, and a main frame 2
1, and a lower bracket 24 extending rearward from the lower end of each leg of the main frame 21 in a bifurcated shape. The lower brackets 24 and 24 are connected to the rear end of the link 5 so as to be relatively rotatable, and the lower brackets 24 and 24 are connected to the rear end of the lower link 6.6 for relative rotation through coaxial lower pivots 26.26. possible to be bound.

The upper bracket 23 is formed with an upper locking portion 27 having a U-shaped engagement groove 27a that opens upward, and each of the lower brackets 24 has a U''$ cane engagement groove 28a that opens backward. A lower locking portion 28 and a hook 29 that cooperate with the lower locking portion 28 are provided.An upper connecting pin 30, which will be described later, of the work implement 4 is engaged with and disengaged from the upper engaging groove 27a by vertical relative displacement, and a lower locking portion 28 is provided with a hook 29 that cooperates with the lower locking portion 28. A lower connecting pin 31 of the working machine 4, which will be described later, is configured to engage and disengage from the matching groove 28a by relative displacement in the front and rear direction.

Furthermore, the lower locking portion 28 is arranged to hold the rear connecting pin 31 engaged therewith adjacent to and coaxially with the inner end of the lower pivot 26.

The hook 29 has two positions: a lock position L (FIG. 4) where the lower connecting pin 31 is secured in cooperation with the lower locking part 28, and an unlock position WU (7th position) where the hook 29 is spaced forward from the lower locking part 28.
It is fixed to an operating handle 32 which is pivotally supported on the lower bracket 24 so as to be rotatable between the lower bracket 24 and the lower bracket 24. And between the lower brackets 1 to 24 and the hook 29, a hook 29 is provided.
A toggle spring 33 that can be resiliently held at any position of U is stretched.

Further, in the center of the cross member 22, a yoke support plate 36 that supports the boss 34a of the rear yoke 34 of the universal joint 14 via a hair ring 35 is provided with four support poles parallel to the axis of the rear yoke 34. l-37, 37...
・Can be installed via.

Each support bolt 37 has its front end connected to the rear cork 34 via an elastic support member 38, and is arranged to pass through a through hole 39 of the cross member 22, and has a retainer 40 fixed to its rear end. A coil spring 41 is compressed between the cross member 22 and the cross member 22 . This support bolt 3
7 has a large diameter portion 37a, a tapered portion 37b, and a small diameter portion 37c arranged in order from the elastic support member 38 side toward the retainer 40, and the large diameter portion 37a is connected to the through hole 39. The small diameter part 37c is a long sleeve part that can be fitted into the through hole 39 with an appropriate play, and the tapered part 37b is a large part, the small diameter part 37a, This is a part that continuously connects between 37c.

The inner hole of the boss 34a of the rear cork 34 is formed into a tapered hole 42 whose diameter becomes larger toward the rear.
A plurality of driving clutch teeth 43, 43 are protruded from the rear end of the clutch.

A window 44 through which a centering body 45 (described later) can pass is provided in a portion of the cross member 22 that faces the boss 34a.

On the other hand, the working machine 4 includes a rear coupler frame 50 (second coupler frame). This rear coupler frame 50 is
It consists of a pair of main frames 51.51 arranged in a convex shape and a pair of auxiliary frames 52 connected to the upper ends of these main frames 51.51. 17
' The lower ends of the auxiliary frames 52 and 52 are respectively fixed to the upper brackets 53 and 53, and the lower ends of the auxiliary frames 52 and 52 are respectively fixed to the brackets 54 and 54 on the gear case 16.

The upper ends of the main frames 51, 51 and the auxiliary frames 52, 52 are connected by an upper connecting pin 30.

The lower end of each main frame 51 can enter into the corresponding bifurcated lower bracket 24 of the front coupler frame 20, and the lower connecting pin 31 is fixed to the lower end.

Further, a centering body 45 is spline-coupled to the input shaft 15. This centering body 45 has a truncated conical shape that becomes smaller in diameter toward the front so as to fit into the taper hole 42, and has the drive clutch teeth 43, 43, . . . at its rear end.
A plurality of driven clutch teeth 55, 55, . . . that can mesh with the clutch are formed. Both clutch teeth 43.43...;55
, 55... constitute a dog clutch.

Next, the operation of this embodiment will be explained. 6 and 7 show the tractor 1 and the work Ia4 separated into the front and rear. In this state, the four support bolts 37, 37, . Fit (Figure 5A (a)
state), thereby holding the yoke support plate 36, that is, the rear yoke 34 at the reference position.

To connect the tractor 1 and the work equipment 4 to each other, first move the tractor 1 backward toward work a4, and then move the upper locking portion 27 of the front coupler frame 20 to the rear coupler frame by lifting and lowering the link mechanism 2. 50 upper connecting pin 30, then lift the link mechanism 2,
The working machine 4 is lifted up via the upper connecting pin 30.

Then, the work equipment 4 swings forward using the upper connecting pin 30 as a fulcrum due to its own weight, and the lower connecting pin 31 of the rear coupler frame 50 engages the lower locking portion 28 of the front coupler frame 20.
engage with. After confirming these engagements, operate hunt′
When the hook 29 is shifted to the locking position L by rotating the lever 32 backward, the lower connecting pin 31 can be locked by the cooperation of the lower locking portion 28 and the hook 29.

On the other hand, while the work implement 4 swings forward until the lower connecting pin 31 engages with the lower locking portion 28 , the alignment body 45 integrated with the input shaft 15 moves to the boss 34 of the rear yoke 34 of the universal joint 14 .
a, and engage the driving clutch teeth 43, 43, . . . with the driven clutch teeth 55, 55, .

By the way, if the tips of both clutch teeth 43 and 55 interfere with each other and normal engagement is not performed, the driven clutch teeth 55 are moved through the rear yoke 34 and the hair ring 35 due to the forward swinging force of the work 84. As the yoke support plate 36 is pushed forward, the yoke support plate 36
7... is moved forward, and the coil spring 4
1. Apply compressive deformation to 41... (state shown in Figure 5A (c)). Therefore, even if the two clutch teeth 43.55 interfere, the engagement of the lower connecting pin 31 with the lower locking portion 28 is not hindered in any way.

Thereafter, when both the clutch teeth 43.55 become in a state where they can be engaged due to the relative rotation between the power take-off shaft 12 and the input shaft 15,
The yoke support plate 36 moves rearward due to the elastic force of the coil springs 41, 41, . . . , causing the driving clutch teeth 43 to mesh with the driven clutch teeth 55.

When both clutch teeth 43, 55 are in a normal engaged state, the yoke support plate 36 is maintained in the state shown in FIG. 5A (b). That is,
The yoke support plate 36 is slightly spaced forward from the cross member 22, and the elastic force of the coil springs 41, 41, .

In addition, in this state, the large diameter portion 37a of each support bolt 37
4. The tapered portion 37b is pulled forward from the through hole 39 of the cross member 22. J, and the small diameter portion 37C occupies a position within the through hole 39, creating play between it and the through hole 39, so that when the axes of the rear yoke 34 and the input shaft 15 are deviated from each other, According to the fitting of the tapered hole 42 and the alignment body 45, the rear yoke 34 is displaced within the range of the above-mentioned play, and when the above-mentioned both axes are inclined to each other, the yoke is supported by the deformation of the elastic support member 38. An inclination is created between the plate 36 and the support bolt 37. In this way, the axes of the rear cork 34 and the input shaft 15 are aligned.

As described above, the work of connecting the tractor 1 and the work equipment 4 is completed, and by operating the link mechanism 2 to raise and lower the work equipment 4, the work equipment 4 can be raised and lowered, and by driving the power take-off shaft 12, the power is transferred from the rear yoke 34. It can be transmitted to the centering body 45 and the input shaft 15 via both clutch teeth 43 and 55, and can drive the rotary tiller blade unit 19.

Therefore, in the connected state of the tractor 1 and the work machine 4,
The lower connecting pin 31 of the rear coupler frame 50 is held by the lower locking part 28 and the hook 29 coaxially with the lower pivot 26 that connects the lower link 6 of the link mechanism 2 and the front coupler frame 20. The amount of rearward overhang of the work implement 4 from the lower link 6 can be reduced by the amount that the lower connecting pin 31 is closer to the lower pivot 26 than in the conventional device. This means that when the lower locking portion 28 and the lower connecting pin 31 are engaged, even if the lower connecting pin 31 is engaged with a slight offset toward the tractor 1 side from the lower pivot shaft 26.26, the position of the hook 29 is This can be achieved by changing the shape and mounting configuration.

In addition, 56 in the figure is a peephole for connection formed in the auxiliary frame 52.

C1 Effects of the invention As described above, according to the present invention, when the lower locking portion and the lower connecting pin are engaged, the lower connecting pin is lowered and is coaxial with the lower pivot that connects the coupler frames, or the lower pivot Since the lower locking part is provided on the first coupler frame in order to hold the work equipment more offset toward the tractor side, it is possible to effectively reduce the amount of rear overhang of the work equipment from the lower link, and therefore the three-point link The mechanism allows the working machine to be easily raised and lowered, and the turning radius of the working machine becomes smaller during turning work, so that the amount of remaining cultivated land can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of a tractor and working machine in a connected state, FIG. 2 is a side view of the same,
Figure 3 is a rear view of the same, Figures 4 and 5 are IV- of Figure 3.
5A is an enlarged view of the main parts of the 5th leap line, Fig. 6 is a side view of the tractor and work equipment in a separated state, and Fig. 7 is a cross-sectional view of the main parts of Fig. 6. It is an enlarged vertical side view. DESCRIPTION OF SYMBOLS 1... Tractor, 2... Link mechanism, 3... Connecting device, 4... Working machine, 5... Toknob link, 6...
...Lower link, 20...Front coupler frame (first
coupler frame), 25... Upper pivot, 26... Lower pivot, 27... Upper locking part, 28... Lower locking part, 29... Hook, 30... Upper connecting bin, 31・
...Lower connecting pin, 50...Rear coupler frame (second coupler frame) Patent applicant Honda Motor Co., Ltd.

Claims (1)

[Claims] A first coupler frame is connected to a tractor so as to be movable up and down through a three-point link mechanism consisting of one top link and a pair of left and right lower links, and a second coupler frame is connected to a working machine. The upper parts of the first and second coupler frames are provided with upper locking parts and upper connecting pins that can be mutually engaged and disengaged by relative displacement in the vertical direction, and the lower parts of the first and second coupler frames are provided with upper locking parts and upper connecting pins that can be mutually engaged and detached by relative displacement in the front and rear direction. A tractor and a working machine comprising a lower locking part and a lower connecting pin which are engaged with and released from each other, and a hook that can cooperate with the lower locking part to lock the lower connecting pin is pivotally supported on a first coupler frame. In a machine coupling device, when the lower locking part and the lower coupling pin are engaged, the lower coupling pin is held coaxially with the lower pivot that connects the lower link and coupler frame, or offset toward the tractor side from the lower pivot. A coupling device for a tractor and a working machine, characterized in that a lower locking portion is provided on the first coupler frame.