JPH0618484B2 - Coupling device for tractor and work equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coupling device for a tractor and a working machine.

(Prior Art) When connecting a rotary tiller to the rear of the tractor via a three-point link mechanism consisting of a central top link and a pair of left and right lower links in a vertically movable and removable manner, this connecting work is performed. Technology that makes it easy to
It is disclosed in JP-A-60-259104.

In the above-mentioned one, the tiller side end portions of the top link and both lower links are connected by the connecting body, and the connecting body is engaged with the upper part and the left and right side portions of the tiller so as to be disengageably engaged. A blocking device is provided that has a lower engaging portion and releasably prevents the upper and lower engaging portions from being disengaged from the tilling device.

(Problems to be Solved by the Invention) However, in the above, no consideration is given to facilitating the connection between the PTO shaft of the tractor and the input shaft of the tiller, and an improvement in this respect is desired. Has been done.

An object of the present invention is to provide a connecting device for a tractor and a working machine that can solve the above problems.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention is such that the connecting body 14 is connected to the tractor 1 via the three-point link mechanism 9, and the connecting body 14 is moved in the left-right direction. The upper part of the central part and the lower parts of both left and right sides are separably connected to the working machine R, and
A clutch device 26 for connecting and disconnecting the PTO shaft 7 of the tractor 1 and the input shaft 27 of the working machine R at the same time when the connecting body 14 and the working machine R are connected and separated is provided in the clutch 14.
Is an equipment cylinder 28 having a shaft center in the front-rear direction and provided in the connecting body 14, and is rotatably supported in the equipment cylinder 28 to interlock with the PTO shaft 7 and the input shaft 27 is separable. In a connecting device of a tractor and a working machine having a connecting shaft 38 to be connected and a spring 29 that elastically repels the connecting shaft 38 to the input shaft 27 side with respect to the connecting body 14, and the working machine, the equipment cylinder 28 is It is inserted into a mounting plate 17 fixed to the connecting body 14 via a gap 21a, and a spring 29 is fitted to the equipment cylinder 28 between the working machine side end of the equipment cylinder 28 and the mounting plate 17. .

(Operation) When the working machine R is connected to the tractor 1, the working machine R is connected to the connecting body 14, and at the same time, the clutch device is connected.
The input shaft 27 of the working machine R is occlusably connected to the connecting shaft 38 of 26 in a separable manner.

When the input shaft 27 and the connecting shaft 38 are deviated from each other at the time of the connection, the equipment cylinder 28 and the connecting shaft 38 are translated in the radial direction and pivoted, so that the deviation of the axial center is corrected. Axis 27,3
8 is connected smoothly and well.

Further, when the input shaft 27 and the connecting shaft 38 do not correspond to each other in the circumferential direction at the time of the above-mentioned connection, the equipment cylinder 28 and the connecting shaft 38 with the opposite end sides of the two shafts 27, 38 in contact with each other. Is pushed by the input shaft 27, and the spring 29 is contracted and moved toward the tractor 1 side.

In this case, the PTO shaft 7 is lightly rotationally driven to rotate the connecting shaft 38 so as to correspond to the input shaft 27 in the circumferential direction.

As a result, due to the elastic force of the spring 29, the equipment cylinder 28 and the connecting shaft 38 advance to the working machine R side, and the connecting shaft 38 and the input shaft 27 are occlusively connected.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In FIG. 4, 1 is a tractor, 2 is a tractor vehicle body, and 3 is an elevating device mounted on a rear portion of the tractor vehicle body 2. A hydraulic device for raising and lowering a working machine, which has a pair of left and right lift arms 4. Reference numeral 5 is a seat, 6 is a rear wheel, and 7 is a PTO shaft, which projects rearward from the rear end of the vehicle body 2.

R is a side drive type rotary tiller which is exemplified as a working machine, and is connected to the rear of the tractor 1 via a three-point link mechanism 9 so as to be vertically movable and detachable.

The three-point link mechanism 9 includes a central top link 10 and a pair of left and right lower links 11, and each lower link 11 and each lift arm 4 are connected by a lift rod 12.

As shown in FIG. 5 to FIG. 7, reference numeral 14 is a connecting body, which connects the working machine side end portions of the top link 10 and both lower links 11, that is, the rear end portions, and projects upward. A cylindrical main body 15 having a mountain shape when viewed from the front, a cylindrical bridging material 16 provided in a downwardly projecting manner between the left and right side portions of the main body 15, and a left and right body 15 standing upright from the bridging material 16. Mounting plate 17 fixed on both sides
A mounting portion 18 projecting upward from the center of the main body 15 in the left-right direction, a pair of left and right receiving members 19 projecting rearward from both left and right end portions of the main body 15, and an outer side from both receiving members 19. It has a pair of left and right connecting pins 20 and the like projecting from it.

A circular mounting hole 21 is formed in the central portion of the mounting plate 17, and a rear end portion of the top link 10 is detachably connected to a front portion of the mounting portion 18 by a mounting pin 22. Mounting part 18
An upper engaging portion 23, which opens upward, is formed in the rear portion by notching.

A lower engaging portion 24 that opens rearward is formed in each receiving member 19, and a rear end portion of each lower link 11 is detachably provided in each connecting pin 20.

As shown in FIGS. 1 to 3, 26 is a clutch device for releasably connecting the PTO shaft 7 of the tractor 1 and the input shaft 27 of the tiller R, and mounting the connecting body 14. Board
It is removably provided on 17 and has a cylindrical equipment cylinder 28, a coil spring 29, and the like.

The equipment cylinder 28 has an axial center in the front-rear direction, is loosely inserted into the mounting hole 21 of the mounting plate 17 via the gap 21a, is movable in the axial direction, and is mounted in any radial direction. It is possible to move in parallel and swing in the direction of.

A ring-shaped spring receiving portion 30 protruding outward in the radial direction is integrally formed at the end of the equipment cylinder 28 on the side of the tilling device, that is, at the rear end, and at the front end, a retaining ring serving as a stopper is formed. A 31 and a washer 32 are detachably fitted to the outside to prevent the equipment cylinder 28 from coming out backward.

By the way, the PTO shaft 7 of the tractor 1 and the input shaft 27 of the tiller R are connected via a telescopic transmission shaft 34 and front and rear universal joints 35 and 36 provided at both ends of the transmission shaft 34. , Can be released and linked together.

The rear universal joint 36 includes front and rear yokes 37, 38 and both yokes 37, 38.
The front yoke 37 consists of a spider 39 that connects the
It is releasably connected to 34.

The rear yoke 38 serves as a connecting shaft, and is engaged with the input shaft 27 moving to the tractor 1 side in a releasably occlusally connected manner by engaging the upper and lower engaging portions 23, 24 of the connecting body 14 with the tiller R. Something
The rear portion of the rear yoke 38 is supported by the equipment cylinder 28 via a bearing 40, and the equipment cylinder 28 moves and swings integrally with the rear yoke 38.

The male spline part 41 of the input shaft 27 is provided on the inner surface of the rear part of the rear yoke.
And a female spline portion 42 that is releasably occluded. A taper surface 44 is formed on the inner surface of the rear end portion of the rear yoke 38 on the rear side of the female spline portion 42 so as to be tapered forward.

The coil spring 29 is fitted around the outer periphery of the equipment cylinder 28,
It is inserted elastically between the spring receiving part 30 and the mounting plate 17 of the
28 and the rear yoke 38 are held so as to be movable and swingable. The coil spring 29 is mounted on the mounting plate 17 as a mounting tube 28.
As shown in FIG. 2, the rear yoke 38 and the equipment cylinder 28 are elastically pressed by suppressing the front portion of the
Can be held in the connecting posture for the connecting work.

The maximum movable distance l ₁ of the equipment cylinder 28 and the rear yoke 38 to the front side in the axial direction is determined by the occlusion of the male spline portion 41 of the input shaft 27 and the female spline portion 42 of the rear yoke 38 in the axial direction. The length is l ₂ or more, that is, l ₁ ≧ l ₂ .

The tiller R is provided with an input case 48 located in the center of the upper left part in the left-right direction, a top mast 49 projecting obliquely upward and forward from the input case 48, and projecting left and right sides from the input case 48. A pair of support arms 51, a pair of left and right brackets 52 projecting forward from the middle portion of each support arm 51 in the left-right direction, a transmission case 53 and a side plate that are respectively provided below the outer ends of each support arm 51. And a cultivating part 54 which is horizontally rotatably driven between the transmission case 53 and the lower end of the side plate and is composed of a cultivating shaft and a large number of cultivating claws provided on the cultivating shaft, and a cultivating cover which covers the cultivating part 54.
55, a pair of left and right gauge wheels 56, a plowing depth adjusting mechanism 57 for moving the gauge wheels 56 up and down, and the like.

An input shaft 27 protruding forward is rotatably supported by the input case 48.

On the upper part of the top mast 49, an upper connecting shaft 58 that is disengageably engaged with the upper engaging portion 23 is arranged in the left-right direction.

At the front part of both brackets 52, a pair of left and right lower connecting shafts 59 that are engaged with both lower engaging parts 24 in a freely disengageable manner are arranged in the left-right direction.

60 is a pair of left and right blocking devices, which are provided in each receiving member 19,
The lower connecting shafts 59 prevent the lower connecting portions 59 from being disengaged from the lower engaging portions 24, and are equipped with an equipment cylinder 61 erected on the receiving member 19, and upper and lower end portions of the equipment cylinder 61 and the lower engaging portion 24. Retaining pin inserted in
62, an urging spring 63 for urging the retaining pin 62 downward, and a retaining pin 62 fixed to the equipment cylinder 61 and releasably locked at a position where the retaining pin 62 is disengaged from the lower engaging portion 24. A fixing plate 64, a restricting body 65 pivotally supported by the receiving member 19 and releasably holding the retaining pin 62 in the separated position, a spring 66 of the restricting body 65, and the like.

According to the embodiment configured as described above, when the cultivator R is connected to the tractor 1, the retaining pins 62 of the both blocking devices 60 are pulled up on the side of the connector 14 and the restricting body 65 is used. Is held. Further, the cultivated position R is placed on the ground and is in a slightly forward leaning posture as shown in FIG.

In this state, the tractor 1 is moved backward to approach the cultivating device R, and as shown in FIG. 6, on the diagonally lower front side of the upper and lower connecting shafts 58, 59 of the cultivating device R, the connecting body 14 is provided. The upper and lower engaging portions 23, 24 are respectively positioned.

Next, the three-point link mechanism 9, the coupling body 14, and the clutch device 26.
Is gradually raised by the hydraulic device 3, and first, the connecting body 14
The upper connecting shaft 58 is engaged in the upper engaging portion 23, and in this state, the lower engaging portions 24 are located on the front side of the lower connecting shafts 59.

Then, when the three-point link mechanism 9, the connecting body 14 and the clutch device 26 are further raised, the upper connecting shaft 58 is engaged in the upper engaging portion 23 of the connecting body 14, so that the above-mentioned 3 By raising the point link mechanism 9 and the like, the cultivating device R is lifted and rotated around the upper connecting shaft 58 to the tractor 1 side, that is, the front side, and is attracted to the tractor 1 side.

As a result, each lower connecting shaft 59 engages with each lower engaging portion 24 from the rear, and the restricting body 65 is rotated forward, so that each lower engaging portion 24
Move to the front inside.

Further, the rotation of the restricting body 86 to the front side releases the retaining pin 62, and the retaining pin 62 is inserted into the upper and lower end portions of the lower engaging portion 24 as shown in FIG. Thus, the lower connecting shaft 59 is prevented from being disengaged from the lower engaging portion 24.

By the way, as described above, the cultivating device R is rotated around the upper connecting shaft 58 toward the tractor 1 side, and the lower connecting shaft 59 is engaged with the lower engaging portion 24 of the connecting body 14, whereby the cultivating device R is operated. R input axis
27 is guided by the tapered surface 44 of the rear yoke 38, and the rear yoke 38
Enter the inside and insert the male spline part 41 of the input shaft 27 and the rear yoke.
The female spline portion 38 of 38 is occluded.

In this case, the input shaft 27 does not enter the inside of the equipment cylinder 28 from the rear in the axial center direction, but the cultivating device R is connected to the upper connecting shaft.
As the input shaft 27 enters the rear yoke 38 and is connected to the rear yoke 38 by rotating about the rotation shaft center, the input shaft 27 enters the rear yoke 38. Even when the input shaft 27 is not displaced from the normal position or the normal posture before the connection, the axes of the input shaft 27 intersect each other when entering the rear yoke 38.

However, the equipment cylinder 28 and the rear yoke 38 are mounting plates for the connecting body 14.
The input shaft 27 and the rear yoke 38 are provided on the input shaft 27 and the rear yoke 38 because they are provided so as to be able to move in parallel and swing in any radial direction and are held by the coil spring 29 so as to be able to move and swing.
At the time of connection with, the coil spring 29 expands and contracts or bends, and the equipment cylinder 28 and the input shaft 27 move in parallel in the vertical direction and swing, so that the axial center of the input shaft 27 and the rear yoke 38 is changed. The displacement is corrected and the two are smoothly occlusally connected.

Further, even if the input shaft 27 and the rear yoke 38 are deviated from the normal position and the normal posture before the connection, and the shaft center of the input shaft 27 and the rear yoke 38 are deviated from each other due to the above-mentioned deviation, the equipment cylinder The displacement of the shaft center of the input shaft 27 and the rear yoke 38 is corrected by the parallel movement of the 28 and the rear yoke 38 in the radial direction and the swinging.
Both are connected smoothly and satisfactorily.

Further, when the input shaft 27 and the rear yoke 38 are connected, the male spline portion 41 of the input shaft 27 and the female spline portion 42 of the rear yoke 38 do not correspond to each other in the circumferential direction.
It is possible that 41 and 42 do not occlude.

Thus, the equipment cylinder 28 and the rear yoke 38 are the mounting plates 1 of the connecting body 14.
7 is movably provided in the axial direction, and the maximum movable distance l ₁ to the front side in the axial direction of the equipment cylinder 28 is the input shaft.
27 male spline section 41 and rear yoke 38 female spline section 42
Since the occlusal length l _{2 in} the axial direction of is ₂ or more,
Even in the case as described above, the turning of the tiller R about the upper connecting shaft 58 to the front side causes the opposite ends of the male and female spline portions 41 and 42 to contact with each other, and the equipment cylinder 28 and the rear yoke. 38 is pushed by the input shaft 27, the coil spring 29 and the transmission shaft 34 are contracted and moved forward, and the lower engaging portion 24 of the coupling body 14 is moved without any problem.
The lower connecting shaft 59 of the tiller R is engaged therein.

That is, even if the input shaft 27 and the rear yoke 38 do not occlude at all and the tip ends contact each other, the equipment cylinder 28 has a substantially occlusal length l ₂
Since it can retreat only against the coil spring 29, the lower engaging portion 24
The lower connecting shaft 59 is allowed to engage with the lower connecting shaft 59. After this engagement is performed, the PTO shaft 7 is lightly driven to rotate,
The rear yoke 38 rotates via the transmission shaft 34, etc.
The female spline portion 42 of 38 and the male spline portion 41 of the input shaft 27 correspond to each other in the circumferential direction.

When this correspondence is met, the elastic force of the coil spring 29 causes the equipment cylinder 28 and the rear yoke 38 to move forward by extending the transmission shaft 34, and the female spline portion 42 of the rear yoke 38 and the input shaft 27. The male spline part (41) is occluded.

As described above, the work of connecting the tiller R to the tractor 1 is completed.

Next, when separating the tiller R from the tractor 1,
The work is performed in the reverse order of the above. First, the retaining pin 62 of the blocking device 60 is pulled up and locked to the fixing plate 64 as shown by the phantom line in FIG. The 62 is locked at a position separated from the lower engaging portion 24.

In this state, the hydraulic device 3 lowers the cultivating device R via the three-point link mechanism 9 and the connecting body 14 to cultivate the cultivating device R.
The plowing part 54 of is grounded.

Then, when the three-point link mechanism 9 and the connecting body 14 are further lowered, the tiller R rotates around the upper connecting shaft 58 to the rear side and tilts forward, and first, the lower engagement of the connecting body 14 is performed. The lower connecting shaft 59 of the cultivating device R is detached from the inside of the portion 24, and the input shaft 27 is equipped.
The input shaft 27 and the rear yoke 38 are separated from the rear yoke 38 by horizontally moving and swinging the rear yoke 38 and the rear yoke 38 in the vertical direction.
Is disconnected.

Then, when the connecting body 14 is further lowered, the upper connecting shaft 58 of the cultivating device R is relatively disengaged from the upper engaging portion 23 of the connecting body 14 to the upper side.

As a result, the work of separating the tiller R from the tractor 1 is completed.

In the example, the input shaft and the coupling shaft of the clutch device, the spline portion was formed as the occlusal portion, but as the occlusal portion,
A structure other than the spline portion may be adopted.

Further, in the embodiment, the universal joint is used as the joint for connecting the PTO shaft and the input shaft, but other joints may be used.

Further, although the rotary tiller is used as the working machine in the embodiment, a working machine other than the rotary tiller may be used.

The present invention can also be applied to a device that connects a working machine to the front side of a tractor.

(Effects of the Invention) As described in detail above, according to the present invention, the equipment cylinder 28 is inserted into the mounting plate 17 fixed to the connecting body 14 via the gap 21a, and the spring 29 is provided on the working machine side of the equipment cylinder 28. Since the equipment cylinder 28 is fitted between the end portion and the mounting plate 17, the equipment cylinder 28 rotatably supporting the connecting shaft 38 is attached to the mounting plate 17 fixed to the connecting body 14.
It is held in a connected posture by one spring 29, can move up and down within the range of the gap 21a, and by compressing the spring 29, it can move in the axial direction and swing.
The structure for facilitating the connection work between the O-axis 7 and the input shaft 27 of the working machine can be made extremely simple, and the movement and swing of the equipment cylinder 28 can be achieved by fitting one spring 29 into the equipment cylinder 28. Since it can be performed in, it can operate smoothly without being twisted.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Each of FIGS. 1 and 2 is a longitudinal sectional view of a clutch device or the like showing different operating postures, FIG. 3 is a side view of the same, and FIG. Side views, FIGS. 5 and 6 are partial cross-sectional side views of essential parts showing different operating states, and FIG. 7 is a front view thereof. 1 ... tractor, 7 ... PTO shaft, 9 ... 3-point link mechanism, 10 ... top link, 11 ... lower link, 14 ... connecting body, 23, 24 ... upper / lower engaging part, 26 ...... Clutch device, 2
7 …… Input shaft, 28 …… Equipment barrel, 29 …… Coil spring, 38…
… Rear yoke (connecting shaft), 45 …… Maximum movable amount, 46 ……
Occlusal length, 60 ... Blocking device, R ... Rotary tiller (working machine).

Claims (1)

[Claims] 1. A connecting body (14) is connected to a tractor (1) through a three-point link mechanism (9), and an upper part of a central part in the left-right direction and lower parts of both left and right side parts of the connecting body (14) are working machines. (R) is separably connected to the connecting body (14), and the connecting body (14) and the working machine (R) are connected to and separated from the connecting body (14) at the same time.
A clutch device (26) for connecting and disconnecting (7) and the input shaft (27) of the working machine (R) is provided, and the clutch device (26) has a shaft body in a substantially front-rear direction and has a connecting body ( 14) Equipment cylinder
(28) and PTO shaft rotatably supported in the equipment cylinder (28)
A coupling shaft (38) interlockingly coupled with the input shaft (27) that is interlockingly coupled with (7) and the coupling body (14) repels the coupling shaft (38) toward the input shaft (27). A spring that keeps the connection posture with
(29) a tractor-working machine connecting device, wherein the equipment cylinder (28) has a gap in a mounting plate (17) fixed to the connecting body (14).
(21a), the spring (29) is fitted to the equipment cylinder (28) between the working machine side end of the equipment cylinder (28) and the mounting plate (17). Connecting device for tractor and working machine.