JP3576868B2 - Anti-vibration structure of work equipment coupling device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolating structure of a working machine connecting device that enables a tractor and a working machine to be easily connected including a power transmission system.
[0002]
[Prior art]
A tractor working machine connecting device for connecting a working machine while connecting a power transmission system using a connecting frame (referred to as a quick coupler or an auto hitch) for standardizing a top link and left and right lower links. Is known in JP-A-10-286005 and the like.
In this prior art, a connecting frame is connected to a tractor body via a three-point link mechanism having a top link and a pair of left and right lower links, and an upper connecting portion and a pair of left and right lower connecting portions are formed in the connecting frame. Further, a holder for holding a joint shaft for interlocking the PTO shaft of the tractor body and the PIC shaft of the working machine is provided, and the upper connecting portion and the lower connecting portion of the connecting frame are provided with the upper engaging portion of the working machine and the left and right. By connecting the PIC shaft to the joint shaft held by the holder while engaging the pair of lower engaging portions, the work machine of the three-point link specification can be automatically connected to the tractor body. .
[0003]
Since the PIC shaft is inserted while the work implement swings around the upper connecting portion, the holding tool is supported by the connecting frame so as to be swingable via the horizontal axis. The support structure has a clearance tolerance in the vertical direction and the like.
[0004]
[Problems to be solved by the invention]
In the prior art, since the holder is a support structure having a clearance tolerance, when rotation of the joint shaft is transmitted, input rotation fluctuation due to engine rotation fluctuation, torque fluctuation due to input / output angle of the joint shaft, rotary fluctuation, The holder vibrates due to the influence of the rotation of the claw shaft of the cultivator (rotary vibration), etc., which may give a shock to the gear transmission mechanism on the work equipment side, or may have a bad influence such as backlash and noise such as gear noise. Or cause the work equipment to vibrate.
[0005]
An object of the present invention is to provide an anti-vibration structure of a working machine coupling device that can solve such problems of the related art.
The present invention provides an elastic body that imparts a biasing force in at least one of the front-rear direction, the left-right direction, and the up-down direction to the holder in a state where the working machine is connected, between the connection frame and the holder. Accordingly, an object of the present invention is to provide an anti-vibration structure of a working machine coupling device capable of preventing vibration and noise.
[0006]
[Means for Solving the Problems]
A first concrete means of the working machine connecting structure for solving the problem in the present invention is to connect a connecting frame 6 to the tractor vehicle body 2 via a three-point link mechanism 5, and connect the upper connecting portion 7 to the connecting frame 6. A pair of left and right lower connecting portions 8 are formed to engage the upper engaging portion 10 of the working machine 9 and the lower engaging portion 11 of the left and right pair so as to be detachable, respectively, and the PTO shaft 12 of the tractor vehicle body 2 and the working machine 9 is connected to the PIC shaft 13 of the joint shaft 9 by a joint shaft 14. The connecting frame 6 is provided with a holder 15 for holding the yoke 60 of the joint shaft 14 on the PIC shaft side. In the working machine coupling device supported so as to be able to swing around the horizontal axis at 6,
By connecting the PIC shaft 13 to the connection frame 6 while connecting the PIC shaft 13 to the yoke 60 from the separated state, the biasing force of the holder 15 in at least one of the front-rear direction, the left-right direction, and the up-down direction. Is provided between the connecting frame 6 and the holder 15.
[0007]
Thus, in a state in which the working machine 9 is connected to the connection frame 6 and the PIC shaft 13 is connected to the yoke 60, the elastic body 18 can be moved at least in the front-rear direction, the left-right direction, or the up-down direction with respect to the connection frame 6. A bias force is applied in one direction and pressed to prevent vibration and noise between the two.
A second concrete means for solving the problem in the present invention is that, in addition to the first concrete means, a positioning member 66 is provided on the holder 15 and the positioning member 66 is provided on the connecting frame 6 in a state where the working machine is separated. And a stopper 67 that allows the positioning member 66 to move when the holder 15 swings around the horizontal axis when the PIC shaft 13 is connected to the yoke 60. The swing direction elastic body 18A that is compressed by the positioning member 66 with the swing of the holder 15 around the horizontal axis when the shaft 13 is connected to the yoke 60 is provided.
[0008]
Thus, the swinging direction elastic body 18A can be easily and appropriately provided by using the positioning member 66 and the stopper 67 for positioning the holder 15 in order to properly connect the PIC shaft 13 to the yoke 60. Will be possible.
A third specific means for solving the problem in the present invention is that, in addition to the second specific means, a plurality of upper connection portions 7 of the connection frame 6 are formed so as to have different vertical distances from a lower connection portion 8. A plurality of stoppers 67 of the connecting frame 6 and a supporting position of the shaft 65 of the holder 15 are formed vertically, and the swing direction elastic body 18A is provided on the positioning member 66 or the upper and lower stoppers 67. .
[0009]
Thus, even if the connecting frame 6 is configured to be capable of connecting a plurality of types of working machines, the swinging direction elastic body 18A can be provided simply and appropriately using the positioning member 66 and the stopper 67. become.
A fourth specific means for solving the problem in the present invention is that, in addition to any one of the first to third specific means, the working machine 9 has a PIC shaft 13 projecting from a gear case 33. And the holding member 15 is provided with a longitudinal elastic body 18 </ b> C that is compressed when the PIC shaft 13 is connected to the yoke 60.
[0010]
Thereby, the repulsive force of the longitudinal elastic body 18C is applied to the gear case 33 and the holder 15 to prevent the holder 15 and the like from vibrating in the front-rear direction.
A fifth concrete means for solving the problem in the present invention is, in addition to any one of the first to fourth concrete means, a PIC shaft between the shaft portion 65 of the holder 15 and the connection frame 6. 13 is provided with a left-right elastic body 18B that is compressed or has a prestress when connected to the yoke 60.
Thus, the resilient force of the left-right elastic body 18B is applied to the shaft 65 of the holder 15 and the connection frame 6 to prevent the holder 15 and the like from vibrating in the left-right direction.
[0011]
A sixth specific means for solving the problem in the present invention is a guide body which, in addition to the first specific means, has a positioning member 66 provided on the holder 15 and a left and right shaft portion 65 supported on the connecting frame 6. When the PIC shaft 13 is connected to the yoke 60 when the guide member 61 receives the positioning member 66 in a state where the working machine is separated from the yoke 60, the positioning member 66 is pivoted around the horizontal axis of the holder 15. A stopper 67 is provided to allow the movement, and an elastic body 79 is disposed between the holder 15 and the left and right guides 61. The elastic body 79 has a cylindrical portion interposed between the shaft 65 and the guide 61. 81 and a projection 82 which is interposed between the positioning member 66 and the stopper 67 and is compressed when the PIC shaft 13 is connected to the yoke 60.
[0012]
Thus, with the working machine 9 connected to the connection frame 6 and the PIC shaft 13 connected to the yoke 60, the holder 79 is moved by the elastic body 79 to the connection frame 6 in the front-back direction, the left-right direction, and / or the up-down direction. And apply a biasing force to it to prevent vibration and noise between them.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIGS. 1 and 2, a working machine 9 exemplified as a rotary cultivator is mounted in a special state (a mounting state of a special three-point link specification) on a connecting apparatus 1 mounted on a tractor body 2. By changing the link 3 and the top link bracket 26 to those of the standard three-point link specification, it is possible to change to the standard three-point link specification mounting state.
[0014]
The tractor vehicle body 2 has a top link bracket 26 mounted on the upper rear surface thereof, a work implement lifting / lowering device 27 having a hydraulic cylinder mounted on the rear upper surface, a lower link pin 30 on a lower rear portion of the tractor vehicle body 2, and a PTO shaft 12. Is projected rearward from substantially the center of the rear surface.
The three-point link mechanism 5 has a top link 3 and a pair of left and right lower links 4, and a front connection part 3 </ b> R of the top link 3 is connected to a top link bracket 26 via a pin, and a front connection part of the left and right lower links 4. 4F is connected to a lower link pin 30, and this lower link 4 is connected to a lift arm 28 of a work implement elevating device 27 via a lift rod 29 so as to be able to move up and down.
[0015]
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 connecting frame 6 has a special three-point link specification (or a standard three-point link specification). The work machine 9 is connected detachably and vertically by raising and lowering a lifting device 27, and the PTO shaft 12 and the PIC shaft 13 are connected to each other via a joint shaft 14.
The working machine 9 projects a support arm 34 to the left and right from a gear case 33 with the PIC shaft 13 projecting forward, and fixes a transmission case and a side frame to outer ends of the left and right support arms 34 to form a machine frame (rotary machine frame) 9A. The transmission case and the lower part of the side frame rotatably support the claw shaft, and a large number of tilling claws are attached to the claw shaft.
[0016]
A top mast 36 is fixed on the gear case 33, and a connecting bracket 37 projecting forward and backward is fixed to the left and right support arms 34.
The pin at the front upper end of the top mast 36 of the working machine 9 forms an upper engaging portion 10 that is engaged with the upper connecting portion 7 of the connecting frame 6. 6 form a lower engaging portion 11 which is engaged with the left and right lower connecting portions 8.
In the first embodiment shown in FIGS. 1 to 7, the connection frame 6 incorporated as the connection device 1 is a main frame formed in a substantially A-shape in rear view by a square pipe (or a round pipe, a flat bar, or the like). An upper body 42 is fixed to the upper center of the main frame 41, and a lower body 43 is fixed to the lower left and right sides. The left and right lower body 43 and the middle part left and right of the upper reinforcing member 44 are connected by a pair of left and right substantially L-shaped support members 45.
[0017]
The upper body 42 is connected to a rear connecting portion 3R of the top link 3 through a pin at a front upper portion, and a pair of upper and lower concave upper connecting portions 7A and 7B is formed at a rear portion. The upper connecting portions 7A and 7B are located at different distances from the lower connecting portion 8 and selectively engage with the upper engaging portion 10 of the working machine 9 of the special specification or the standard specification.
The lower body 43 is formed of two plate members or a member bent in a U-shape, and a pin is protruded outward from a plate material protruding from the front portion thereof to be connected to a rear connection portion 4R of the lower link 4. A point 16 is formed.
[0018]
The lower connecting portion 8 is formed at the rear of the lower body 43 in the form of a lower connecting portion 8 that is open rearward. The lower connecting portion 8 has a substantially U-shaped (or J-shaped) plate material 46 fixed to the two plate-shaped portions forming the lower body 43 in a side view.
As shown in FIGS. 5 and 7, a lock member 48 is rotatably supported on the lower body 43 via a horizontal shaft 47, and can protrude from a hole 46 a of the substantially U-shaped plate 46. Has become. The lock member 48 can be engaged with the lower engaging portion 11 engaged with the lower connecting portion 8 by protruding from the hole 46a, and the lower engaging portion 11 is detached from the lower connecting portion 8 by being engaged. Prevent you from doing so.
[0019]
The lock member 48 is urged by a coil spring in a direction in which the lock member 48 is engaged with the lower engagement portion 11, and a front portion thereof is connected to a mountain-shaped link 51 of the release unit 50. The release means 50 has an arm 53 pivotally supported by a bracket 52 fixed to the upper reinforcing member 44, the center of a link 51 penetrates the arm 53 so as to be relatively rotatable, and an operation lever 54 is fixed to the arm 53. By rotating the operation lever 54, the link 51 moves beyond the arm 53, and the lock member 48 rotates to release the engagement with the lower engagement portion 11.
[0020]
Since the substantially U-shaped plate 46 abuts the lower engagement portion 11 with a larger area than the two plate members, the surface pressure is reduced, the abrasion is reduced, the stable engagement is achieved, and the locking member is provided. The upper limit of the projection of 48 can be made by the substantially U-shaped plate member 46.
Note that the lock means constituted by the lock member 48 and the like is not limited to the above-described configuration, and various conventional techniques can be used.
1 and 3, a PTO shaft 12 and a PIC shaft 13, which constitute a power transmission system of the working machine 9, are linked and connected by a joint shaft 14, and the joint shaft 14 has a telescopic shaft at an intermediate portion. The side connected to the PTO shaft 12 has a conformal universal joint (constant speed universal joint) 58 composed of two sets of hook type joints, and the side connected to the PIC shaft 13 has one set of hook type joints. A universal joint 59 is provided. It should be noted that the conformal universal joint 58 may be employed also on the PIC shaft 13 side.
[0021]
The rear end of the joint shaft 14 has a yoke 60 fitted and connected to the PIC shaft 13, and the yoke 60 is supported by the holder 15.
The holder 15 is supported by a guide body 61 fixed to the left and right support members 45 of the connection frame 6. The holder 15 includes a cylindrical body 63 that rotatably supports a yoke 60 about a shaft center via a bearing, a holder 64 having a substantially U-shape in plan view and a cylindrical body 63 fixed to a front surface thereof, and a holder 64. A pair of left and right shaft portions 65 formed by fixing pins to the left and right sides of the shaft 64.
[0022]
The shaft portion 65 is disposed so as to be displaced rearward from the cylindrical body 63, and the holder 15 is pivotally supported by the guide body 61 via the shaft portion 65 so as to be swingable about a horizontal axis. The holding member 64 is provided with a positioning member 66 protruding in a radially outward direction. The positioning member 66 is formed of a pin or a pipe, and can be received by one of a pair of upper and lower stopper portions 67a and 67b provided on the guide body 61. It has become.
The holder 15 can swing about the shaft 65, and can be held in a position where the positioning member 66 abuts against the lower surface of the stopper 67. The positioning member 66 and the stopper 67 control the yoke 15 in posture. This is the attitude control means that performs the operation.
[0023]
That is, when the holder 15 is in a state before being fitted to the PIC shaft 13, the positioning member 66 is received by the stopper portion 67, and the axis of the yoke 60 and the axis of the PIC shaft 13 are substantially concentric. When the yoke 60 is fitted on the PIC shaft 13, the positioning member 66 is separated from the stopper 67.
A swing direction elastic body 18A is attached to the rear side surface of each of the upper and lower stopper portions 67. The rocking direction elastic body 18A is formed of an elastic material such as rubber or synthetic resin, and when the yoke 60 is fitted on the PIC shaft 13 and the positioning member 66 is separated from the stopper 67, the positioning member The elastic restoring force is applied to the positioning member 66 by applying a biasing force (bias force).
[0024]
The biasing force applied to the positioning member 66 becomes a force for resiliently pressing the holder 15 to a state before the holder 15 is fitted to the PIC shaft 13, that is, a force to pry the holder 15 and the PIC shaft 13. 6 is eliminated, and the play between the PIC shaft 13 and the gear transmission system in the work machine 9 is also absorbed.
The rocking direction elastic body 18A is provided on the stopper portion 67 side, but may be provided on the positioning member 66 with an adhesive or the like as in a modification shown in FIG. The body 18A can be formed in an arc shape or a cylindrical shape.
[0025]
A substantially inverted J-shaped groove 68 is formed in the guide body 61, and the lower end 68 a and the upper end 68 b of the groove 68 can engage and hold the shaft 65. A tubular left-right elastic body 18B is fitted to the shaft portion 65, and the left-right elastic body 18B is compressed on the side surface of the guide body 61 with the shaft portion 65 engaged with the groove 68. To apply a prestress (biased force) in the left-right direction to the holder 15.
When the holder 15 is located at the center of the lower left and right connecting portion 8, the left-right elastic body 18 </ b> B has substantially equal prestress on the left and right sides. The elastic body 18B on the side where it is located is compressed more, and acts to resiliently press the holder 15 toward the center.
[0026]
The upper and lower connecting portions 7 and 8 have large play in the left and right direction, and in many cases in the working machine connected state, the center of the connecting frame 6 does not coincide with the center of the PIC shaft 13 in the left and right direction, and the holding is performed. The tool 15 is biased to the left and right by a very small size. Even if the left and right elastic bodies 18B are provided in a pair on the left and right, the elastic force rarely antagonizes. 15 to the right and left direction.
As shown in FIGS. 1 and 2, the holder 15 mainly has a special three-point link in a state where the shaft 65 is held at the lower end 68 a of the groove 68 and the positioning member 66 is engaged with the stopper 67 a. As shown in FIG. 4, the state in which the shaft 65 is held at the upper end 68b of the groove 68 and the positioning member 66 is engaged with the stopper 67b is mainly a standard It is used for connecting the point link working machine 1.
[0027]
In this connection frame 6, by selecting the lower end 68 a and the upper end 68 b of the groove 68, the holder 15 is provided so as to be capable of changing its position in the up-down direction and / or the front-rear direction with respect to the connection frame 6. And the lower linking portion 8 and the lower link connecting point 16 can be changed in position. Depending on the working machine 9 to be connected, which of the upper and lower connecting portions 7A and 7B is engaged, By the change, even if the position of the PIC shaft 13 in the vertical direction and / or the front-back direction changes, the connection with the joint shaft 14 is ensured.
[0028]
On the front surface of the gear case 33 of the working machine 9, a cylindrical longitudinal elastic body 18C is provided so as to be fixed or loosely fitted to the PIC shaft 13. The working machine 9 is connected to the connection frame 6 to form a PIC. With the shaft 13 connected to the joint shaft 14, the longitudinal elastic body 18C is compressed by being sandwiched between the gear case 33 and the holder 15, and exerts a biasing force that pushes and separates the gear case 33 and the holder 15 in the longitudinal direction. appear.
The left-right elastic body 18B gives a pre-stress that urges the holder 15 to the theoretically appropriate position side, whereas the swing direction elastic body 18A and the front-rear direction elastic body 18C The elastic load is applied in the direction away from the theoretically appropriate position. However, all of the elastic members 18 give a biasing force to elastically push the holder 15 from the actual connection position.
[0029]
The left and right elastic bodies 18B may be arranged on only one of the left and right sides of the holder 15 or may be arranged on one of the left and right sides with different prestress magnitudes. By doing so, it becomes possible to positively and reliably act on the biasing force of pressing the holder 15 after being connected to the PIC shaft 13.
9 to 11 show a second embodiment of the present invention, in which the upper connecting portion 7 of the connecting frame 6 has only one location, and the holder 15 can swing around the shaft 65. The vertical position cannot be changed. The longitudinal elastic body 18 </ b> C is formed of a coil spring, and is attached to the holder 15 or the gear case 33.
[0030]
There is no J-shaped groove in the guide body 61 fixed to the support member 45, and a hole 70 for supporting the shaft portion 65 is formed, and the elastic body 79 disposed between the holder 15 and the left and right guide bodies 61 is formed. In the first embodiment, a plate-like portion 80, a tubular portion 81 and a protrusion 82 projecting laterally from the plate-like portion 80 are integrally formed of an elastic material such as rubber or synthetic resin.
The cylindrical portion 81 is fitted into the shaft portion 65 and inserted into the hole 70 of the guide body 61, absorbs vibration from the holder 15 to the connection frame 6, and receives the plate-shaped portion 80 and the cylindrical portion 81. In the pre-stress state, a bias can be applied to the holder 15 in the front-rear direction, the left-right direction, and the up-down direction to reduce vibration.
[0031]
Accordingly, the plate-shaped portion 80 functions as the left-right elastic body 18B, and the tubular portion 81 functions as the front-back elastic body 18C and / or the up-down elastic body.
The protrusion 82 is disposed between the positioning member 66 and the upper surface of the stopper 67, and is compressed by the positioning member 66 by swinging when the PIC shaft 13 is connected to the yoke 60. ing.
A pair of holes 80a through which the positioning member 66 penetrates are provided in the plate-shaped portion 80 above and below the projection 82, and the guide body 61 has a shape for both left and right, and may be arranged on either the left or right of the holder 15. The protrusion 82 serves as the swing direction elastic body 18A.
[0032]
FIG. 12 shows a modification of the swinging direction elastic body 18A. One end of a leaf spring 84 is fixed to the cylindrical body 63 or the holding body 64 of the holder 15, and the other end of the leaf spring 84 is attached to the mounting body 76 or the upper side. It is connected to the reinforcement 44. A compression coil spring may be used instead of the leaf spring 84.
The leaf spring 84 also serves as a posture control unit, and is extended before the holder 15 is fitted to the PIC shaft 13, and holds the yoke 60 in a posture suitable for insertion of the PIC shaft 13. It is compressed as it is fitted to the PIC shaft 13, and in the fitted state, gives a biasing force to bias the holder 15 toward the pre-fitting posture.
[0033]
It should be noted that the present invention is not limited to the above embodiment, but can be variously modified. For example, the positioning member 66 is formed in a rod shape with an elastic material such as rubber or a spring, and one end thereof is fixed to the holder 15, and the other end is engaged with the guide body 61. The positioning member 66 may be elastically deformed to apply a biasing force to the holder 15 as the PIC shaft 13 is inserted into the yoke 60 and the holder 15 is swung. . The front-rear direction elastic body 18C does not have to be cylindrical, and may be a leaf spring or the like. The elastic body 18 may be weighted by adding a metal shim or the like. Since the swing direction elastic body 18A presses the holder 15 downward, it may be recognized as a vertical elastic body.
[0034]
【The invention's effect】
According to the present invention described in detail above, the elastic body 18 is elastically deformed in a state where the working machine 9 is connected to the connection frame 6, and the restoring force causes the holder 15 to move at least in the front-back direction, the left-right direction, or the up-down direction. The biasing force in any one direction can be applied, and the backlash of the holder 15 with respect to the connection frame 6 can be regulated, and the vibration and noise of the holder 15 and the power transmission system can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view showing a first embodiment of the present invention.
FIG. 2 is an enlarged sectional side view showing a main part.
FIG. 3 is an exploded perspective view of a connection frame.
FIG. 4 is a partial cross-sectional side view of a connection frame.
FIG. 5 is a side view of the connection frame.
FIG. 6 is a front view of a connection frame.
FIG. 7 is a perspective view of a lower portion of the connection frame.
FIG. 8 is a cross-sectional side view showing a modification of the swing direction elastic body.
FIG. 9 is an exploded perspective view showing a second embodiment of the present invention.
FIG. 10 is a side view of the holder and the elastic body.
FIG. 11 is a sectional view taken along line XX of FIG. 10;
FIG. 12 is a sectional side view showing a modified example of the swing direction elastic body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Connecting device 2 Tractor vehicle body 3 Top link 4 Lower link 5 Three-point link mechanism 6 Connecting frame 7 Upper connecting part 8 Lower connecting part 9 Work implement 9A Machine frame 10 Upper engaging part 11 Lower engaging part 12 PTO shaft 13 PIC shaft 14 Joint shaft 15 Holder 18 Elastic body 18A Swing direction elastic body 18B Left-right elastic body 19C Front-rear elastic body 60 Yoke 65 Shaft 66 Positioning member 67 Stopper

Claims (6)

A connecting frame (6) is connected to the tractor body (2) via a three-point link mechanism (5), and an upper connecting portion (7) and a pair of left and right lower connecting portions (8) are connected to the connecting frame (6). The upper engaging portion (10) and the pair of left and right lower engaging portions (11) of the working machine (9) are detachably engaged with each other, and work with the PTO shaft (12) of the tractor body (2). The PIC shaft (13) of the machine (9) is connected by a joint shaft (14), and a holder (15) for holding the PIC shaft side yoke (60) of the joint shaft (14) is connected to the connection frame (6). A working machine connecting device provided with the holding tool (15) via a shaft (65) so as to be swingable about a horizontal axis on a connecting frame (6);
By connecting the PIC shaft (13) to the yoke (60) while connecting the work machine (9) to the connection frame (6) from the separated state, the holder (15) is attached to the holder (15) in the front-rear direction, the left-right direction or the up-down direction. Characterized in that an elastic body (18) for imparting a biasing force in at least one direction is provided between the connecting frame (6) and the holder (15). Construction. A positioning member (66) is provided on the holder (15), and the connecting frame (6) receives the positioning member (66) in a state where the working machine is separated, and connects the PIC shaft (13) to the yoke (60). A stopper (67) is provided to allow the positioning member (66) to move as the holder (15) swings around the horizontal axis when the PIC shaft (13) is attached to the stopper (67). A swing direction elastic body (18A), which is compressed by a positioning member (66) as the holding member (15) swings around the horizontal axis when connected to the (60), is provided. 2. The anti-vibration structure of the working machine coupling device according to 1. A plurality of upper connecting portions (7) of the connecting frame (6) are formed at different vertical distances from the lower connecting portion (8) to support the shaft (65) of the holder (15) and the connecting frame ( 6) The plurality of stopper portions (67) of 6) are formed vertically, and the swing direction elastic body (18A) is provided on the positioning member (66) or the upper and lower stopper portions (67). The anti-vibration structure of the working machine coupling device described in the above. The work machine (9) projects the PIC shaft (13) from the gear case (33), and the PIC shaft (13) is connected to the yoke (60) between the gear case (33) and the holder (15). The vibration isolating structure for a working machine coupling device according to any one of claims 1 to 3, further comprising a front-back elastic body (18C) that is compressed when the work machine is connected. A left-right elastic body compressed or prestressed when the PIC shaft (13) is connected to the yoke (60) between the shaft portion (65) of the holder (15) and the connection frame (6). The anti-vibration structure for a working machine coupling device according to any one of claims 1 to 4, wherein (18B) is provided. The holder (15) is provided with a positioning member (66), and the connecting frame (6) is provided with a guide body (61) for supporting the left and right shaft portions (65). When the positioning member (66) is received and the PIC shaft (13) is connected to the yoke (60), the positioning member (66) is allowed to move as the holder (15) swings around the horizontal axis. A stopper (67) is provided, and an elastic body (79) is arranged between the holder (15) and the left and right guides (61). The shaft (65) and the guide ( 61), and is compressed when the PIC shaft (13) is connected to the yoke (60) by being interposed between the positioning member (66) and the stopper (67). The work according to claim 1, characterized in that a projection (82) is provided. Vibration-proof structure of the coupling device.

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