JP2848774B2 - Tractor work equipment coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor connecting device for a working machine.

[0002]

2. Description of the Related Art When a rotary cultivator is connected behind a tractor via a three-point link, a connecting frame 71 shown in FIGS. 11 to 13 is provided at the rear end of the three-point link to facilitate the connection. What is provided is described in JP-A-5-123002. A hook 73 for hooking the upper connection pin 72 of the rotary tiller from below is provided at the upper center in the left-right direction of the connection frame 71, and the lower connection pin 74 of the rotary tiller is provided on the lower left and right sides of the connection frame 71. There is provided a fitting receiving member 76 formed with a fitting portion 75 which can be fitted from the rear side.

A rear end of a three-point link top link 77 is pivotally attached to the hooking member 73, and a rear end of the left and right lower link is pivotally attached to the right and left fitting receiver 76. When the rotary tiller is connected, the hook 73 is hooked on the upper connecting pin 72 to raise the three-point link, so that the lower connecting pin 74 is fitted into the fitting portion 75 from behind. A lock member 79 that engages with the lower connection pin 74 to prevent the lower connection pin 74 from being detached from the fitting portion 75 is provided on the connection frame 71.
And a pair of locking members 79
The support shaft 80 is detachably connected to the lower connection pin 74.
A torsion coil spring 81 is provided rotatably around the left and right axes through the left and right sides of each lock member 79 and biases the lock members 79 to engage with the lower connecting pins 74.
Is arranged. The torsion coil spring 81 is provided on the support shaft 8.
0, and one end is hooked on a lock member 79, and the other end is hooked on a fitting receiving member 76.
The right and left lock members 79 which urge the front part downward are attached to the left and right lock members 79 by the support shaft 8.
In order to simultaneously rotate around zero, the interlocking member 82 made of a bar is interlocked. This interlocking member 82
Has a pair of left and right side rods 83, and at the lower end of the left and right side rods 83 is provided a pivot 84 that penetrates the rear part of the lock member 79 from the inside in the left and right direction. They are connected by a rod 85. One end of an arm 86 is externally fitted to the connecting rod 85, and the other end of the arm 86 is
An operation lever 89 is fixedly attached to the arm 86 via a pivot 88 to a bracket 87 fixed to the bracket 3.

When the operating lever 89 is at the position shown by the solid line in FIG. 11, the lock member 79 is engaged with the lower connecting pin 74, and at this time, the connecting rod 85 is connected to the pivot 8
8, the urging force of the torsion coil spring 81 urges the arm 86 in the direction of rotating the arm 86 forward, and acts to rotate the rear part of the lock member 79 upward around the support shaft 80. . Further, when the operation lever 89 is rotated from the above state to the position shown by the imaginary line, the arm 86 rises from the forward inclined state, so that the front part of the lock member 79 is pulled up via the interlocking member 85 and the rear part of the lock member 79 is supported. Axis 80
The lower connecting pin 7 of the lock member 79 is rotated around
Release the engagement with 4.

At this time, the axis of the pivot 84 and the connecting rod 8
Since the line segment h connecting the axis 5 with the axis 5 passes through the axis of the pivot 88, the urging force of the torsion coil spring 81 urges the arm 86 in the direction of rotating backward, and the rear portion of the lock member 79 is pivoted. Acts to rotate downward about 80. At this time, the downward rotation of the lock member 79 is restricted by the contact of the lock member 79 with the stop portion 90 on the bottom wall of the fitting receiver 76.

[0006]

In the prior art, as shown in FIG. 13, the line h is a dead point passing through the axis of the pivot 88, and the position where the rear part of the lock member 79 is most lowered. At the dead point, the rear part of the lock member 79 is raised, that is, displaced in the lock direction.

Therefore, at the unlocked position of the lock member 79, there is a gap between the lock member 79 and the stopper portion 90, and depending on how the load is applied, the connecting rod portion 85 connects the connecting portion with the arm 86. The lock member 79 on one of the left and right contacts the stopper 90,
The vertical position of the left and right lock members 79 is not aligned,
When the production error is large, there is a problem that even when the engagement of the lock member 79 with the lower connection pin 74 is released, the lock member 79 may be hooked on the lower connection pin 74.

Accordingly, an object of the present invention is to consider so that the left and right lock members can be reliably maintained at the unlock position.

[0009]

The technical measures taken by the present invention to attain the above object are connecting pins on the working machine 12 side on both left and right sides of a connecting frame 11 provided behind the tractor body 1. 35 is provided with a fitting portion 32 capable of fitting the engagement pin 35 from the rear side. A lock member 41 for preventing detachment from the fitting portion 32 is provided rotatably around the left and right axis via a support shaft 44, and a lower end is pivotally attached to a front portion of the left and right lock member 41 so as to be rotatable around the left and right axis. An interlocking member 46 including left and right side rods 47 and a connecting rod 48 for connecting upper ends of the left and right side rods 47 is provided. Part, one end side of the arm 50 is provided rotatably around the left and right axis via the pivot 52, Pivoted to the other end of the arm 50 to the connecting rod portions 48 of the interlocking member 46, the left and right lock members 41,
By rotating the arm 50 around the pivot 52 from the lock position a engaged with the connection pin 35, the arm 50 is rotated to the lock release position b disengaged from the connection pin 35 and biases the lock member 41. A tractor working machine in which the arm 50 is rotated beyond a dead point so that the urging force of the spring 42 acts in the lock direction at the lock position a and acts in the unlock direction at the unlock position b. In the connecting device, the connecting rod 4 of the interlocking member 46
8, while the interlocking member 46 moves from the dead point to the lock release position b of the lock member 41, the rear end of the lock member 41 attempts to displace in the locking direction. The point is that it is configured to be absorbed by the bending of the portion 48.

[0010]

When the arm 50 is rotated to move the lock member 41 from the lock position a to the unlock position b,
The connecting rod portion 47 of the interlocking member 46 bends before reaching the dead point, and after exceeding the dead point, is displaced so that the bending returns. Therefore, while the interlocking member 46 moves from the dead point to the unlock position b of the lock member 41, the rear portion of the lock member 41 attempts to be displaced in the locking direction and is absorbed by the bending of the connecting rod portion 48 at the dead point. The member 41 is reliably maintained at the unlock position b.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 7 and 8, reference numeral 1 denotes a tractor body, and a work implement lifting hydraulic device 3 having a pair of left and right lift arms 2 is provided on a rear portion thereof.
Is protruding. Also, 3
A point link 5 is provided, and a front end side of the top link 6 of the three-point link 5 is pivotally connected to a bracket 7 fixed to the tractor body 1, and front ends of right and left lower links 8 of the three-point link 5 are rear portions of the tractor body 1. The lower link 8 is connected to the left and right lift arms 2 via lift rods 9 at the middle in the front-rear direction.

A connecting frame 11 is provided at the rear end of the three-point link 5, and the rotary tiller (working machine) 1 is mounted on the connecting frame 11.
2 are detachably connected. This rotary tiller 1
2 are support arms 1 on the left and right sides from the gear case 13.
4, a transmission case 15 is provided at an outer end of a right support arm 14, and a side frame 16 is provided at an outer end of a left support arm 14.
7 is provided.

A lower portion of the rotary machine frame 17 comprises a claw shaft rotatably supported between the lower portion of the transmission case 15 and the side frame 16, and a plurality of tillage claws mounted on the claw shaft. A rotary tilling unit 18 is provided. Also,
The rotary machine casing 17 is provided with a cover device 21 that covers the rotary tilling unit 18. PTO shaft 4 of the tractor
From the gear case 13 via the universal joint 19.
Is transmitted to the rotary tilling unit 18 via the transmission mechanism from the input shaft 20 to rotate the claw shaft.

As shown in FIGS. 1, 2 and 3, the connecting frame 11 has a main frame member 22 formed in a mountain shape in a front view by a square pipe. Is provided with an intermediate frame member 23 for connecting the left and right sides of the main frame member 22. A hook 24 is provided on the top of the main frame member 22,
Fitting receivers 25 are provided at lower left and right ends of the main frame member 22, and the left and right fitting receivers 25 are connected to the intermediate frame member 23 by supports 26.

The hooking tool 24 is formed in a hook shape so that a rear side thereof can hook an upper connecting pin 28 provided on a top mast 27 of the rotary tiller 12 in a left-right direction from below, and a top link is provided on a front side. 6 A pin 29 to which the rear end is pivotally attached is provided. Each fitting receiver 25 is a main frame 2
2 has a pair of left and right side walls 30 fixed to the left and right lower ends,
The lower front portions of the left and right side walls 30 are connected by a bottom wall 31,
The fitting portion 3 is inserted from the rear into the middle part of the left and right side walls 30 at the rear end side.
2 is recessed. Left and right side walls 30 above the fitting portion 32
The rear end is connected by a rear upper wall 33, and the left and right side walls 30 below the fitting portion 32 protrude rearward, and the rear end is connected by a rear lower wall 34.

Accordingly, the fitting receiver 25 is open between the bottom wall 31 on the upper surface, the front surface, and the lower surface and the lower rear wall 34, and the fitting portion 32. A lower connecting pin 35 on the rotary tiller 12 side in the left-right direction can be fitted into the fitting portion 32 from behind, and the lower connecting pin 35 is
Brackets 36 fixed to left and right support arms 14
It is provided in.

A connecting pin 37 to which the rear ends of the left and right lower links 8 are connected is disposed on the outer side in the left-right direction of the fitting portion 32 of each fitting receiver 25, and the connecting pin 37 is connected to the outer wall 3.
No. 0 is fixed to the outer surface via a contact plate 38. At the lower left and right ends of the main frame member 22, a plate 39 inserted into the upper front part of the fitting receiver 25 is fixed. A holder 40 is provided between the supports 26 of the connection frame 11 so as to be rotatable around the left and right axes. A yoke on the rear end side of the universal joint 19 is rotatably supported on the holder 40 via a bearing. The yoke is spline-fitted to the input shaft 20 of the gear case 13 so as to be freely detachable.

A lock member 41 and a torsion coil spring 42 are incorporated between the left and right side walls 30 of each fitting receiver 22. The lock member 41 is formed from a plate material,
The lower receiving pin 35 has a hook shape in which an upper concave portion 43 is formed on the rear upper surface side so as to engage with the lower connecting pin 35 fitted in the fitting portion 32 of the fitting receiver 25 from below and prevent the lower connecting pin 35 from being removed. The lock member 41 is rotatably fitted around a tubular support shaft 44 in the left-right direction provided between the left and right side walls 30 at the front and rear halfway, and is disposed on the left-right side inward between the left and right side walls 30. Has a through hole 45 formed therein.

The left and right lock members 41 are linked by a link member 46. The interlocking member 46 is formed of a flexible round bar or the like into a substantially mountain shape when viewed from the front, and includes left and right side rods 47 inclined upward and inward in the left and right direction. A connecting rod portion 48 for connecting the upper end members together, and a pivot portion 49 extending from the lower end of each of the left and right side rod portions 47 outward in the left and right direction and inserted into the through hole 45 of the lock member 41 from the inside in the left and right direction. Have been.

Each of the right and left torsion coil springs 42 is disposed on the outer side in the left and right direction of the lock member 41 and is fitted on a support shaft 44, one end of which contacts the lower end of the plate 39, and the other end of which is an interlocking member 46. Of the lock 49, and urges the front of the lock member 41 and the interlocking member 46 downward. The upper portion of the rear surface of the lock member 41 is an inclined guide surface, and when the rotary tiller 12 is connected, when pressed by the lower connection pin 35 , the rear portion of the lock member 41 resists the urging force of the torsion coil spring 42. Then you can run down.

One end of an arm 50 is rotatably fitted at the center in the left-right direction of the connecting rod portion 48 of the interlocking member 46, and the other end of the arm 50 is fixed to the intermediate frame member 23 of the connecting frame 11. The bracket 51 is pivotally supported via a pivot 52 at a lower portion of the bracket 51. An operation lever 53 is fixed to the arm 50, and the operation lever 53 is
Can be operated from above the tractor when is raised.

In the above configuration, when the rotary cultivator 12 is connected to the tractor, the tractor body 1 is positioned in front of the rotary cultivator 12, and the tractor body 1 is moved backward with the three- point link 5 lowered. And the hook 24
Stops when it reaches the lower side of the upper connecting pin 28, and the connecting frame 11 is raised by the three-point link 5. Then, the upper connecting pin 28 is hooked by the hooking tool 24, so that the rotary tiller 12 is lifted and the upper connecting pin 2 is lifted.
It turns to the tractor body 1 side around 8 and the lower left and right connecting pins 3
5 is fitted into the fitting portion 32 of the left and right fitting receiving member 25 while moving the rear part of the locking member 41 downward, and the locking member 4 after fitting is fitted.
The rear portion moves upward, and the lower connecting pin 35 is locked.

The lock position a of the lock member 41 (FIG. 1)
, The arm 50 is inclined forward, and the urging force of the torsion coil spring 42 acts in a direction to rotate the arm 50 forward about the pivot 52,
The front part of the lock member 41 is pulled down to rotate the rear part upward about the support shaft 44, and the stopper part 54 at the lower rear end side of the lock member 41 contacts the rear lower wall 34 of the fitting receiver 25 and locks. The upward rotation of the rear portion of the member 41 is restricted, and the lock member 41 is held at the lock position a.

Next, when the rotary tiller 12 is separated from the tractor body 1, the following is performed. First, the rotary tiller 12 is raised to approach the tractor body 1, and the operation lever 53 is turned from the upper position shown by the solid line in FIG. 1 to the lower position shown by the imaginary line. Then, the arm 50 rotates backward about the pivot 52,
Since the arm 50 rises from the forward inclined state, the interlocking rod 4
6 is lifted upward, whereby the locking member 4
1 The rear part is raised and the front part of the lock member 41 is
4 is moved downward to a lock release position b (indicated by a phantom line in FIG. 1) which contacts the bottom wall 31 of the fitting receiver 25.

At this time, since the line c connecting the axis of the pivot 49 of the interlocking member 46 and the axis of the connecting portion of the connecting rod 48 with the arm 50 exceeds the dead point, the torsion coil spring 42 is attached. The force acts to rotate the arm 50 backward about the pivot 52, and the lock member 41 is held at the lock release position b. And the connection frame 1
When the rotary tilling machine 12 is grounded by lowering 1, first, the lower connecting pin 35 connecting rod 48 is disengaged rearward from the fitting receiver 25, and then the hooking tool 24 is disengaged downward from the upper connecting pin 28.

In the detaching operation of the rotary tiller 12, as shown in FIG.
During the period from the locked state to the dead point, the connecting rod member 48 bends upward. That is, in the locked state of the lock member 41, the distance between the axis of the pivot 49 and the axis of the connecting portion of the arm 50 of the connecting rod 48 is the distance between the axis of the pivot 49 and the end of the connecting rod 48. The distance L is the same as the distance from the heart. From this state, the connecting portion of the arm 50 of the connecting rod 48 moves about the axis d of the pivot 52,
The pivot portion 49 moves around the axis e of the support shaft 44, and at the dead point, the distance between the axis of the pivot portion 49 and the axis of the connecting portion of the arm 50 of the connecting rod portion 48 becomes equal to the pivot portion 4.
The distance L between the axis of No. 9 and the axis of the end of the connecting rod 48 is L + f. At this dead point, the lock member 41 is located at the lock release position b.

After passing the dead point, the distance between the axis of the pivot 49 and the axis of the connecting portion of the arm 50 of the connecting rod 48 becomes L + g (g, as shown in FIGS. 5 and 6).
<F), even if the position of the connecting portion of the arm 50 of the connecting rod portion 48 is lowered, only the amount of bending of the connecting rod portion 48 is reduced, and the position of the side rod portion 47 is not lowered. The lock release position b is maintained.

In the above configuration, when the interlocking member 46 is in the unlocked state of the lock member 41, the connecting rod 48 does not have to be bent.
When the lock member 41 is in the locked state, the connecting rod portion 48 may be already bent. The cover device 2
As shown in FIGS. 7 and 8, a main cover 55 covers the upper part of the tilling portion 18 and a rear portion pivotally attached to the rear end of the main cover 55 so as to be rotatable around a left-right axis. Cover 56
A V-shaped notch 57 is formed at the center in the left-right direction of the rear cover 56 in correspondence with the cultivator mounted when performing the ridge work. When forming a low ridge, the extension cover 5 is attached to the lower end of the rear cover 56.
8 is attached.

The extension covers 58 are provided as a pair on the left and right sides.
The inner side in the left-right direction is attached and fixed to the rear cover 56 by a mounting tool 59, and the outer end in the left-right direction is a support 60 shown in FIG.
It is attached and fixed by. That is, the support member 60 is composed of a plate 63 fixed by bolts 61 and nuts 62 at the outer end of the extension cover 58 and a support shaft 64 attached to the plate 63 and inserted into the cylindrical portion 56a at the rear end of the rear cover 56. Become.

When performing a normal tilling operation, the extension cover 58 is removed, and the notch 57 is closed by the cover 70. As shown in FIG. 10, the side frame 16 is provided with a residual tillage processing claw 65 for processing residual tillage at the ridge. The residual tillage processing claw 65 is inserted at one end from the other end side of the holding cylinder 66 pivotally attached to the middle part of the outer surface of the side frame 16 in the vertical direction through a bracket via a bracket, and is retained by a pin. The insertion hole 68 of this pin formed in the holding cylinder 66 is
A plurality is formed in order to adjust the amount of protrusion from 6. Further, the side frame 16 is provided with brackets 6 vertically fixed to fix the holding cylinder 66 to a use state located below the side frame 16 and a non-use state located above the side frame 16, respectively.
8, 69 are provided.

[0031]

According to the present invention, the connecting rod portion 48 of the interlocking member 46 is provided with flexibility, and the interlocking member 46 is moved from the dead point to the unlock position b of the lock member 41. Since the rear portion 41 is configured to be absorbed by the bending of the connecting rod portion 48 at the dead point to the extent that the rear portion is displaced in the lock direction, the arm 50 is rotated to move the lock member 41 from the lock position a to the lock release position b. Then, the connecting rod portion 47 of the interlocking member 46 bends before reaching the dead point, and after the dead point is over, the connecting rod portion 47 is displaced so as to return to the bending.
When the lock lever 41 is moved to the unlock position b, the rear portion of the lock member 41 is displaced in the locking direction and absorbed by the bending of the connecting rod portion 48 at the dead point, so that the lock member 41 is reliably maintained at the unlock position b. Is done.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a coupling device.

FIG. 2 is a diagram showing an arrow A in FIG. 1;

FIG. 3 is an enlarged view of the lower left and right sides of the connecting device.

FIG. 4 is an operation explanatory view of an interlocking member.

FIG. 5 is an operation explanatory view of an interlocking member.

FIG. 6 is an operation explanatory view of an interlocking member.

FIG. 7 is a side view of a rear part of the tractor and a working machine.

FIG. 8 is a rear view of the cover device.

FIG. 9 is a perspective view showing an extension cover support structure.

FIG. 10 is a perspective view showing a side frame.

FIG. 11 is a side view of a connection device showing a conventional example.

FIG. 12 is a rear view of a connection device showing a conventional example.

FIG. 13 is an operation explanatory view according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tractor vehicle body 12 Rotary cultivator (working machine) 25 Fitting receiver 32 Fitting part 35 Lower connecting pin 41 Lock member 42 Torsion coil spring 44 Support shaft 46 Interlocking member 47 Side rod part 48 Connecting rod part 50 Arm 52 Axis

────────────────────────────────────────────────── ─── Continued on the front page (72) Kazuyoshi Umeki 64, Ishizukitamachi, Sakai-shi, Osaka Kubota Sakai Works Co., Ltd. (56) References JP-A-5-168301 (JP, A) JP-A-5-168 123002 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01B 51/00-61/04

Claims (1)

(57) [Claims] 1. A fitting portion (32) capable of fitting a connecting pin (35) on the working machine (12) side from the rear side on both left and right sides of a connecting frame (11) provided behind a tractor vehicle body (1). The fitting receiver (25) formed is provided, and each fitting receiver (2) is formed.
5), the rear part engaged disengageably the connecting pin (35) with the fitting portion of the connecting pin (35) to (locking member for preventing the disengagement from 32) (41), shaft (44) Is provided so as to be rotatable around the left and right axes through the lower end, and the lower end is a left and right locking member (41).
An interlock comprising a left and right side rod (47) pivotally attached to a front portion of the left and right axis so as to be rotatable around a left and right axis, and a connecting rod (48) for connecting upper ends of the left and right side rods (47). A member (46) is provided, and one end of the arm (50) is pivotally connected to the pivot (52) at the center in the left-right direction above the fitting receiver (25) of the connection frame (11).
The arm (5)
0) is pivotally connected to the connecting rod (48) of the interlocking member (46), and the left and right locking members (41) are connected to the connecting pins (35).
By rotating the arm (50) about the pivot (52) from the lock position (a) engaging with the connecting pin (3),
A spring (4) for rotating the lock member (41) so as to be rotated to a lock release position (b) which is disengaged from the lock member (41).
The arm (50) is rotated beyond the dead point so that the biasing force of (2) acts in the lock direction at the lock position (a) and acts in the unlock direction at the unlock position (b). In the tractor working machine connecting device, the connecting rod (48) of the interlocking member (46) is provided with flexibility, and the interlocking member (46) is moved from the dead point to the unlocking position of the lock member (41). While reaching (b), the rear end of the lock member (41) is displaced in the locking direction by the connecting rod (48) at the dead point.
A work machine coupling device for a tractor, characterized in that the tractor is absorbed by bending of the tractor.