JP4916375B2 - Work equipment mounting device - Google Patents

Description

  The present invention relates to a work implement mounting apparatus for mounting a work implement such as a rotary tiller on a tractor vehicle body.

In a work machine connection device in which a connection frame is provided on a three-point link mechanism attached to a tractor, and a work machine is mounted on the connection frame, the upper and lower middle parts of the connection frame are divided, or the support bracket of the work machine By dividing the midway part in the front-rear direction or by dividing the midway part of the top mast of the working machine, and connecting the divided parts with an elastic body, vibrations and the like associated with the work can be detected on the tractor side. Can be suppressed (attenuated) or blocked (see Patent Document 1).
Japanese Patent No. 3602424

In the prior art, in the structure in which the middle part of the support bracket or the top mast is divided, it must be applied to each work machine, and the versatility is low. On the other hand, the structure in which the middle part of the connection frame is divided. Then, if applied to one connecting frame, it can be used for all work machines.
However, even in the configuration in which the middle part of the connection frame is divided, the top link and the upper engaging portion (top mast) of the work machine are connected to the upper part of the connection frame, and the lower link and the work machine are connected to the lower part of the connection frame. For example, when the work implement is driven like a rotary tiller, the forward pushing impact from the work implement side is large. It is difficult to sufficiently absorb vibration with the elastic body of the divided portion.

An object of this invention is to provide the working machine mounting apparatus which enabled it to solve such a problem of the prior art.
In the present invention, at least one of the upper connecting portion and the lower connecting portion is formed in a connecting body formed separately from the connecting frame, and the connecting body is mounted on the connecting frame 6 so as to be movable back and forth via a buffer mounting tool. Accordingly, it is an object of the present invention to provide a work implement mounting apparatus capable of effectively absorbing forward vibration and impact from the work implement side to the tractor vehicle body.

Specific means for solving the problems in the present invention are as follows.
1stly, it is the working machine mounting device which connected the connection frame 6 to the rear end of the direct mounting hitch mechanism 5 with which the front part was connected with the tractor vehicle body 2, and mounted | wore with the working machine S to this connection frame 6,
The connecting frame 6 is provided with an upper connecting portion 7 and a pair of left and right lower connecting portions 8 that are detachably engaged with the upper engaging portion 10 and the pair of left and right lower engaging portions 11 of the work machine S, respectively. And
At least one of the upper connecting portion 7 and the lower connecting portion 8 is formed in a connecting body F formed separately from the connecting frame 6, and this connecting body F is attached to the connecting frame 6 so as to be movable back and forth and is connected to the connecting frame 6. A buffer mounting tool C that biases the working machine S in the backward direction with respect to the forward movement of the working machine S is provided therebetween.

Second, the direct hitch mechanism 5 is constituted by a three-point link mechanism having a top link 3 and a pair of left and right lower links 4.
Third, the connecting frame 6 is provided with a guide member 18 for guiding the forward and backward movement of the connecting body F.
Fourth, the shock absorber C includes an elastic body 15A that elastically presses the connecting body F backward, and an opposing elastic body 15B that opposes the elastic body 15A and elastically presses the connecting body F forward. It is characterized by.

Fifth, the shock mount C is connected to one of the attachment member 17 fixed to the connection frame 6, the support member 16 fixed to the connection body F, and the support member 16 and the attachment member 17, and slides to the other. A guide member 18 made of a guide pin that is freely inserted, and an elastic body made of a coil spring that is fitted to the guide member 18 between the support member 16 and the mounting member 17 to repress the connecting member F backward. 15.
"Action"
The work implement mounting device has the following effects according to the above configuration.

When the work implement S mounted on the tractor vehicle body 2 via the direct hitch mechanism 5 generates vibrations and shocks in the front-rear direction, the forward vibrations and shocks are buffered by the buffer mounting tool C, and the tractor vehicle body 2 Attenuated and propagated. In particular, when the work implement S is a rotary cultivator, the forward vibration / impact is large due to the rotational force of the down cut claws, and the vibration / impact is propagated to the connecting body F provided on at least one of the upper and lower sides. The shock absorber C absorbs it and attenuates.
By mounting the coupling body F on both the upper and lower sides of the coupling frame 6 via the buffer mounting tool C, vibrations and impacts in the front-rear direction are absorbed more efficiently not only in the down cut but also in the upper cut.

The connecting body F is guided by the guide member 18 to move back and forth, and the upper connecting portion 7 and the pair of left and right lower connecting portions 8 of the connecting frame 6, the upper engaging portion 10 of the work implement S and the pair of left and right lower engaging portions 11. The respective engagements can be reliably maintained.
The shock absorber C includes not only the elastic body 15A that represses the connecting body F in the rear direction, but also the opposing elastic body 15B that opposes the elastic body 15A and represses the connecting body F in the front direction. As well as absorbing backward vibration and shock.
The shock absorber C is simply configured by providing an attachment member 17 on the connection frame 6, a support member 16 on the connection body F, a guide member 18 passing through them, and an elastic body 15 between them. be able to.

  According to the present invention, the connecting body F that forms at least one of the upper connecting portion 7 and the lower connecting portion 8 is provided on the connecting frame 6 via the shock mount C, so that the forward direction from the work implement side to the tractor vehicle body is achieved. Can effectively absorb vibration and shock.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1-6, 1st Embodiment of the working machine mounting apparatus 1 applied to the tractor is shown, The working machine S illustrated by the rotary tiller is in a special state (mounted state of a special three-point link specification). By changing the top link 3 of the direct mounting hitch mechanism (three-point link mechanism) 5 described later to the standard three-point link specification state, the standard three-point link specification state is obtained, and the two-point link mechanism (Direct mounting hitch mechanism) and a two-point link mounting work machine can also be used to achieve a two-point link specification mounting state.

In each state, the tractor vehicle body 2, the direct mounting hitch mechanism 5, the connecting frame 6 and the joint shaft 14 for standardizing the direct mounting hitch mechanism 5 are the same. The tractor vehicle body 2 has a top link bracket 22 fixed to the upper rear portion, a work machine lifting device 23 having a hydraulic cylinder mounted on the rear upper surface, a lower link pin 30 in the rear lower portion of the tractor vehicle body 2, and a PTO shaft 12 Protrudes rearward from the approximate center of the back.
The three-point link mechanism 5 includes a top link 3 and a pair of left and right lower links 4, and a front connection portion 3 </ b> F of the top link 3 is connected to the top link bracket 22 via a pin, and a front connection portion of the left and right lower links 4. 4F is connected to a lower link pin 30, and the lower link 4 is connected via a lift arm of a lifting device 23 and a lift rod so that it can be lifted and lowered.

A connecting frame 6 is connected to the rear end of the three-point link mechanism 5, that is, the rear ends of the top link 3 and the left and right lower links 4, and the work machine S is detachably attached to the connecting frame 6. At the same time, the PTO shaft 12 and the PIC shaft 13 are connected by the joint shaft 14.
The working machine S forms a rotary machine frame 35 by projecting a support arm 34 to the left and right from a gear case 33 projecting forward from the PIC shaft 13, and fixing a transmission case and a side frame to the outer ends of the left and right support arms 34. A claw shaft is rotatably supported at the lower part of the case and the side frame, and a plurality of tilling claws are attached to the claw shaft.

Further, a top mast 36 is fixed on the gear case 33, a connection bracket 37 protruding forward is fixed to the left and right support arms 34, and a support frame extending rearward is connected so as to be swingable. A height adjustment mechanism is provided between the mast 36 and the height of the earthenware or the rear two wheels mounted on the rear portion of the support frame.
A pin at the front upper end of the top mast 36 of the work machine S forms the upper engaging portion 10, and a pin provided on the left and right connecting bracket 37 forms the lower engaging portion 11.
The connecting frame 6 has a top link connecting pin 3B connected to the rear end of the top link 3 at the upper part so as to be detachable, and a lower link connecting pin 32 connected to the rear end of the lower link 4 protrudes outward at the lower part. The upper connection body FU in the upper center in which the upper connection part 7 is formed and the lower left and right lower connection bodies FD in which the lower connection part 8 is formed are provided.

That is, the connection frame 6 has a main frame 41 formed in a square shape when viewed from the back with a square pipe (or round pipe, flat bar or the like), and a top link connection pin at the center upper portion of the main frame 41. The upper body 42 that passes through 3B is fixed, the lower body 43 that projects the lower link connecting pin 32 is fixed to the left and right lower portions, the lower ends of the left and right lower bodies 43 are connected by the lower frame member 44, and the upper portions of the left and right lower bodies 43 are fixed. Are connected by a central frame 45, and a parallel lower frame member 44 and the left and right middle portions of the central frame 45 are connected by a pair of left and right support members 48.
The mounting member 17 is fixed to the left and right side surfaces of the upper body 42, and the mounting member 17 is also fixed to the upper surface of the main frame 41. On the back side of the upper body 42, the upper coupling body FU is an upper buffer. It is attached via a mounting tool CU. The upper connecting body FU has a U-shape of the upward opening in a side view, forms an upper connecting portion 7 that engages with the upper engaging portion 10 in the upward opening, and has support members 16 protruding from the left and right side surfaces. .

The upper shock absorber CU is fitted to the support member 16 fixed to the upper connecting body FU, the mounting member 17 fixed to the connecting frame 6, the guide member 18 slidably inserted through them, and the guide member 18. And an elastic body 15 that compresses the connecting body F in the front-rear direction.
The attachment members 17 are fixed oppositely to the left and right ends of the lower frame member 44 and the central frame 45 that are in the vicinity of the inner sides of the left and right lower bodies 43, and the left and right lower coupling bodies are disposed between the lower frame member 44 and the central frame 45. Each FD is attached via a lower shock absorber CD. The lower connecting body FD is U-shaped in a side view of the rear opening, forms a lower connecting portion 8 that engages with the lower engaging portion 11 in the rear opening, and supports the upper and lower mounting members 17 on the upper and lower surfaces. The member 16 is protrudingly provided.

Each of the lower shock absorbers CD is supported by a support member 16 fixed to the lower connecting body FD, an attachment member 17 fixed to the connection frame 6 side, and a guide slidably inserted through the support member 16 and the attachment member 17. A member 18 and an elastic body 15 that is fitted to the guide member 18 and elastically compresses the lower connecting body FD in the front-rear direction.
The guide member 18 is formed of a guide pin, and in the upper connecting body FU, a middle portion thereof is supported by the mounting member 17, and the guide member 18 is connected to the connecting frame 6 by the pair of left and right guides. Guides the forward and backward movement of the body FU. In the lower connecting body FD, the middle part of the guide member 18 is supported by the support member 16 so that the lower connecting body FD moves back and forth with respect to the connecting frame 6 by the presence of a pair of upper and lower guide members 18. I am guiding you.

The elastic body 15 in each of the upper and lower shock absorbers CU, CD is formed of a coil spring, and is disposed between the support member 16 and the mounting member 17 and elastic body 15A for repressing the connecting body F in the backward direction. And an opposing elastic body 15B that opposes the elastic body 15A and elastically presses the connecting body F forward.
The opposing elastic body 15B is disposed between the tip of the guide member 18 and the mounting member 17 in the upper shock absorber CU, and is disposed between the tip of the guide member 18 and the support member 16 in the lower shock absorber CD. ing.

In a state where the elastic body 15A and the counter elastic body 15B are balanced, the support member 16 on the guide member 18 is held at a neutral position where it does not deviate back and forth, and the connecting body F receives the back and forth vibration and impact from the work machine S. When one of them is moved, one side is compressed to absorb the vibration / impact, and the vibration / impact transmitted to the connecting frame 6 is buffered.
When the work implement S performs downcut tillage or the like, mainly the elastic body 15A of the lower buffer mounting tool CD and the opposing elastic body 15B of the upper buffer mounting tool CU absorb the forward impact, and the opposing elastic force of the lower buffer mounting tool CD. When the body 15B and the elastic body 15A of the upper shock mount CU absorb the reaction against the forward impact and perform the upper cut tillage or the like, the reverse is true. When the work implement S performs downcut tillage or the like, a forward impact may also be applied to the upper engagement portion 10, and at that time, the elastic body 15 </ b> A of the upper shock absorber CU acts as a buffer.

The presence of both the upper and lower shock absorbers CU and CD, and the presence of both the elastic body 15A and the opposing elastic body 15B, cause vibrations and impacts in the front-rear direction to be transmitted to both the top link 3 and the lower link 4. Can absorb.
Each of the left and right lower connecting bodies FD is not only formed with a lower connecting portion 8 that is detachably engaged with the lower engaging portion 11 on the back side, but also has a rear opening recess and a hollow inside. Thus, a lock member 52 that prevents the engaged lower engaging portion 11 from being detached is pivotally supported.
As shown in FIGS. 2 and 3, the lock member 52 is rotatably supported by the lower connecting body FD via a horizontal shaft 53, and the rear portion of the lock member 52 has a lock recess 52a. The lower engaging portion 11 engaged with the connecting portion 8 is engaged from the rear side to prevent the lower engaging portion 11 from being detached.

  The lock member 52 is urged by a coil spring in a direction to engage with the lower engagement portion 11, and its front portion is connected to a mountain-shaped link 56 of the release means 55. In the release means 55, an arm 58 is pivotally supported by a bracket 57 fixed to the central frame 45, and the center of the link 56 passes through the arm 58 so as to be relatively rotatable, and an operation lever 59 is fixed to the arm 58. By rotating the lever 59, the link 56 moves beyond the arm 58, and the lock member 52 rotates clockwise in FIG. 2 so that the engagement with the lower engagement portion 11 is released. ing.

1 and 3 to 5, the PTO shaft 12 and the PIC shaft 13 are interlocked and connected by a telescopic joint shaft 14, and a yoke 62 fitted and connected to the PIC shaft 13 at the rear end portion of the joint shaft 14. The yoke 62 is supported by the holder 61.
The holder 61 is supported between the left and right support members 48, and a cylindrical body 63 that supports the yoke 62 rotatably around the axis via a bearing, and a U-shape in plan view fixed to the back surface of the cylindrical body 63. A holding body 64 having a shape and a pair of left and right shaft portions 65 formed by penetrating and fixing pins on the left and right walls of the holding body 64 are provided.

The shaft portion 65 is arranged to be displaced rearward from the axial center of the cylindrical body 63, and the holder 61 is pivotally supported by the support member 48 via the shaft portion 65. The holding body 64 is provided with a positioning member 66 protruding in the radially outward direction, and this positioning member 66 can come into contact with a stopper 67 provided on the carrier member 48.
The holder 61 can swing around the shaft portion 65, and can be held in a posture in which the positioning member 66 is in contact with the stopper 67. The positioning member 66 and the stopper 67 control the posture of the yoke 62. It is a means.

1, 3, and 6, the control unit 24 that controls the lifting device 23 and the detection unit 26 of the work machine S are interlocked and connected to the vertical portion of the L-shaped stay 68 that protrudes from one of the left and right connection bodies F. The midway part of the transmission means 25 is supported.
The detection unit 26 is an angle detection sensor of a rear cover 70 of a rotary tiller as the work implement S, and the control unit 24 receives an angle detection signal from the detection unit 26 and operates the lifting device 23. Thus, an automatic plowing depth control mechanism for detecting a change in plowing depth due to unevenness in the field and changes in soil quality and keeping the plowing depth of the work implement S constant is configured.

A bracket 71 that is long in the front-rear direction is attached to the L-shaped stay 68, and a first hook 72 is pivotally supported at the rear end of the bracket 71 so as to be swingable about the horizontal axis. The inner wire 73 is connected to the outer wire 74 and the outer wire 74 is fixed to the bracket 71 to constitute the transmission means 25 on the tractor vehicle body 2 side.
A bracket 77 is provided on the upper surface of the main cover 76 or the support arm 34 of the rotary tiller S so as to project forward. A second hook 78 is pivotally supported on the front end of the bracket 77 so as to be swingable about the horizontal axis. An inner wire 79 connected to the detection unit 26 is connected to the free end side, and the outer wire is fixed to the bracket 77 to constitute the transmission means 25 on the work machine S side.

The first hook 72 and the second hook 78 are engaged so as to be separable from each other. The first connection portion 25A provided on the coupling body F and the second connection portion 25B provided on the work machine S, respectively. Configure.
The first connecting portion 25A and the second connecting portion 25B are engaged when the work implement S is mounted on the connecting frame 6, and the engagement is maintained even when the connecting body F vibrates back and forth with respect to the connecting frame 6. The change in the angle of the rear cover 70 is transmitted to the control unit 24 through the engagement, and the transmission is cut off when the work implement S is detached from the connection frame 6.

FIG. 7 shows a work machine mounting apparatus 1B according to the second embodiment, where the lower connecting body FD and the lower buffer mounting tool CD are the same as those in the first embodiment, and the upper connecting body FU and the upper buffer mounting tool CU are the same. The upper connecting portion 7 is integrally formed at the rear portion of the upper body 42 without being provided.
Therefore, the work implement mounting apparatus 1B according to the second embodiment pivots the upper engagement portion 10 of the work implement S around the upper engagement portion 7 and swings the lower portion of the work implement S around the upper engagement portion 10. Only the lower shock-absorbing wearing tool CD is buffered.
FIG. 8 shows a work implement mounting apparatus 1C according to the third embodiment, wherein the upper connecting body FU and the upper buffer mounting tool CU are the same as those in the first embodiment, and the lower connecting body FD and the lower buffer mounting tool CD are Although not provided, the lower connecting portion 8 is integrally formed with the lower body 43, and a lock member is pivotally supported although not shown.

Accordingly, in the work machine mounting device 1C according to the third embodiment, the lower engagement portion 11 pivotally supports the lower engagement portion 11 of the work implement S, and the upper and lower swings of the upper portion of the work implement S around the lower engagement portion 11 are supported. Only the upper shock absorber CU is buffered.
FIG. 9 shows a modification of the upper connector FU. The distance in the vertical direction from the upper connecting portion 7 to the lower connecting portion 8 in the first to third embodiments (the distance from the upper engaging portion 10 to the lower engaging portion 11 is the same) is the special three-point link specification working machine. This distance is compatible with S, but this distance may be different on standard 3-point link specification work machines or other special work machines. In these cases, the upper connecting body FU must be replaced. Will be able to.

The upper connecting body FU indicated by a two-dot chain line in FIG. 9 is the same as that of the first embodiment. On the other hand, the upper connecting body FU indicated by a solid line has the upper connecting portion 7 at a high position, The distance increases, and the upper connecting body FU indicated by the dotted line is located at a position where the upper connecting portion 7 is low, and the distance to the lower connecting portion 8 is shortened.
The lower connecting body FD is restricted because the lower shock-absorbing attachment CD exists on the upper and lower sides, but the upper connecting body FU having different vertical positions is prepared similarly to the upper connecting body FU. You may make it replace with the thing of embodiment.

The support member 16 and the guide member 18 can be moved back and forth with respect to the mounting member 17, and the front and rear elastic bodies 15A and 15B act on the mounting member 17 when moving back and forth. Absorbs vibration and shock.
In the present invention, the shape of each member and the positional relationship between the front, back, left, right, and top in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.

For example, in each of the shock absorbers CU and CD, the elastic body 15A and the opposing elastic body 15B that urge the coupling body F in the front-rear direction are provided, but only the elastic body 15A is provided without the opposing elastic body 15B. You may make it absorb only the vibration and the impact of the front direction from the working machine S.
Further, the guide member 18 may be provided with a guide surface or member for guiding the connecting body F so as to be slidable back and forth on the connecting frame 6 side instead of the guide pin.

It is a side view which shows 1st Embodiment of this invention. It is a side view of the principal part. It is a rear view. It is an exploded side view. It is a cross-sectional side view of a holder. It is a side view of a transmission means. It is a side view which shows 2nd Embodiment figure. It is a side view which shows 3rd Embodiment figure. It is a side view which shows the modification of an upper coupling body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work implement mounting apparatus 2 Tractor vehicle body 3 Top link 3B Connecting pin 4 Lower link 5 Direct mounting hitch mechanism (3-point link mechanism)
6 connecting frame 7 upper connecting portion 8 lower connecting portion 10 upper engaging portion 11 lower engaging portion 15 elastic body 15A elastic body 15B opposing elastic body 16 support member 17 mounting member 18 guide member (guide pin)
C shock mount F connecting body S work implement

Claims (5)

A work implement mounted in which a connecting frame (6) is connected to the rear end of the direct hitch mechanism (5) whose front part is connected to the tractor vehicle body (2), and a work implement (S) is attached to the connecting frame (6). A device,
The connection frame (6) includes an upper connection portion (7) and a left and right engagement portion (S) that are detachably engaged with an upper engagement portion (10) and a pair of left and right lower engagement portions (11), respectively. A pair of lower connecting portions (8) are provided,
At least one of the upper connecting portion (7) and the lower connecting portion (8) is formed in a connecting body (F) formed separately from the connecting frame (6), and the connecting body (F) is connected to the connecting frame (6). A shock absorber (C) that is mounted so as to be movable back and forth and that urges the work implement (S) in the backward direction with respect to the forward movement of the work machine (S) is provided between the shock absorber and the connecting frame (6). Working machine mounting device.   The work implement mounting device according to claim 1, wherein the direct hitch mechanism (5) is a three-point link mechanism having a top link (3) and a pair of left and right lower links (4).   The work machine mounting device according to claim 1 or 2, wherein a guide member (18) for guiding the forward and backward movement of the connection body (F) is provided on the connection frame (6).   The shock absorber (C) includes an elastic body (15A) that elastically presses the connecting body (F) backward, and an opposing elastic body that opposes the elastic body (15A) and elastically presses the connecting body (F) forward. It has a body (15B), The working machine mounting apparatus of any one of Claims 1-3 characterized by the above-mentioned.   The shock absorber (C) includes an attachment member (17) fixed to the connection frame (6), a support member (16) fixed to the connection body (F), and the support member (16) and the attachment member (17). ) And a guide pin made of a guide pin (18) slidably inserted in the other, and the guide member (18) is fitted between the support member (16) and the mounting member (17). The work implement mounting device according to any one of claims 1 to 4, further comprising: an elastic body (15) made of a coil spring that presses the connecting body (F) backward.

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