JPH067404U - Farmer's lower pin guide connecting device - Google Patents

Abstract

(57) [Summary] [Purpose] The lower pin guide 14 is simply and detachably fitted to the lower pin 3. An engaging portion for engaging the lower pin guide 14 with the lower pin 3 can be easily processed and formed. [Structure] The elastic ring 12 fitted into the fitting groove 7 of the lower pin 3 has an adjusting portion 13 which is cut and separated. The lower pin guide 14 has a fitting hole 15 into which the lower pin 3 is fitted. A tapered pressing portion 19 that presses the elastic ring 12 is formed at the base end of the fitting hole 15, and a locking step portion 20 that is locked by the elastic ring 12 is formed at the tip end of the fitting hole 15.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lower pin guide connecting device for an agricultural work machine, and relates to a lower pin for connecting an agricultural work machine to left and right lower links of a tractor via a quick coupler.

[0002]

[Prior art]

 Conventionally, as a lower pin guide connecting device for this type of agricultural work machine, for example, a structure described in Japanese Utility Model Laid-Open No. 3-37807 is known. In the structure described in this publication, the base end of the lower pin is fixed to the left and right lower pin arms of the working machine, the annular locking groove is formed in the outer periphery of the tip of this lower pin, and the lower pin guide has a guide on this lower pin. Is rotatably fitted, and an annular groove is formed on the inner wall of the tip of the lower pin guide so as to face the engaging groove formed in the lower pin. The engaging groove of the lower pin and the annular shape of the lower pin guide described above. This is a structure in which a series of annular elastic rings is interposed between the groove and the groove, and the elastic ring engages the lower link guide with the lower pin.

[0003]

[Problems to be solved by the device]

 In the structure described in the above publication, the annular groove that engages the elastic ring is formed on the inner wall of the tip of the lower pin guide, so it takes time to form this annular groove, and the lower pin has a lower pin guide. At the time of fitting, the elastic ring formed in a series in an annular shape is elastically expanded and deformed forcibly to fit, so there is a problem that the lower pin guide cannot be easily fitted to this lower pin. .

Therefore, the present invention has been made in view of such problems, and the lower pin guide can be easily formed, and the lower pin guide can be easily fitted to the lower pin. The fitted lower pin guide can be securely retained and held, so that the processing and assembly work is easy, and the quick coupler can be fitted smoothly to the lower pin via the lower pin guide with less frictional resistance. It is an object of the present invention to provide a lower pin guide coupling device for an agricultural work machine that can be manufactured and is less likely to wear each other.

[0005]

[Means for Solving the Problems]

 The lower pin guide connecting device of the agricultural working machine of the present invention has a connecting member for connecting the tractor and the working machine, and a base end portion of the connecting member is fixed to the connecting member and is projected in a direction intersecting with the connecting member. The lower pin includes a lower pin, a lower pin guide rotatably fitted to the lower pin, and an elastic ring that locks the lower pin guide to the lower pin. A ring-shaped fitting groove for fitting the ring is formed, and a guide projection is formed at the tip of this fitting groove with the diameter reduced toward the end. The lower pin guide is rotatably fitted to the lower pin by forming an annular shape with a shape that can fit in the groove and forming a spacing adjustment part in the middle to expand and contract the diameter. Hollow cylinder with mating hole A guide body is formed, and a guide body curved toward the connecting member is formed on the outer peripheral portion of the base end of the guide body, and the elastic ring is pressed against the base end portion of the fitting hole of the guide body. The tapered portion is formed, and a locking step portion that is locked by the elastic ring is formed at the tip of the fitting hole.

[0006]

[Action]

 In the lower pin guide coupling device of the agricultural working machine according to the present invention, when the elastic ring is pushed from the guide protrusion of the lower pin toward the fitting concave groove, the elastic ring is expanded by the adjusting portion and is inserted in the fitting concave groove. The elastic ring is easily fitted to. Next, engage the guide protrusion formed on the tip of the lower pin with the tapered pressing part formed on the base end of the fitting hole of the lower pin guide, and move this lower pin guide toward the lower pin. When forced in the axial direction, the elastic ring is pressed and elastically deformed by the tapered pressing portion formed at the base end of the fitting hole of the guide body. Then, the guide body is pushed further axially deeper into the lower pin, the base end of this guide body is located at the base end of the lower pin, and the fitting hole of the guide body comes off the elastic ring. The ring is automatically expanded, and this elastic ring is engaged with the locking step of the guide body, and this elastic ring locks the lower pin guide, and this lower pin guide is in the direction opposite to the pushing direction with respect to the lower pin. It is prevented from slipping out in the axial direction of. Therefore, the lower pin guide is easily fitted to the lower pin, the outer peripheral portion of the base end of the lower pin is covered by the guide body of the lower pin guide, and the lower pin guide is rotatably attached to the lower pin. Be worn.

Next, when removing the lower pin guide from the lower pin, if the lower pin guide is forcibly pulled in a direction opposite to the direction in which the lower pin is pushed, the elastic ring is pressed by the locking step of the guide body. It is elastically deformed and the guide body is easily pulled out from the lower pin in the axial direction.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a left and right lower pin arm as a connecting member projecting from the left and right portions of the agricultural working machine A toward the front and lower side, and is attached to the tip portions of the left and right lower pin arms 1. The holes 2 are formed facing each other. A base end portion 4 of a lower pin 3 is detachably fixed to the left and right mounting holes 2. The left and right lower pins 3 are formed in a cylindrical shape in cross section, and flanges 5 that engage with the opening edge portions of the left and right mounting holes 2 are integrally formed in the vicinity of the base end portion 4 thereof. A screw shaft portion 6 is integrally provided on the outer end portion of the base end portion 4 so as to project in the axial direction. A fitting groove 7 is formed in an annular shape on the outer peripheral portion near the tip of the lower pin 3, and the guide groove has a tapered shape which is gradually reduced from the fitting groove 7 toward the end. The protrusion 8 is formed so as to integrally project in the axial direction.

Then, the base end portions 4 of the lower pins 3 are inserted into the left and right attachment holes 2 from the outside, respectively, and the base end portions 4 of the lower pins 3 protruding to the inner side portions of the lower pin arms 1 are inserted. Nuts 11 are respectively fastened to the screw shaft portion 6 via a spacer 9 and a washer 10, and the respective lower pin arms 1 are sandwiched between the flange 5 and the spacer 9, so that the left and right lower pins 3 are left and right. It projects outward in a direction orthogonal to the lower pin arm 1.

Further, 12 is an elastic ring, and the elastic ring 12 is formed in an annular shape having a shape that can be fitted into the fitting concave grooves 7 of the left and right lower pins 3, and is cut along the way to be separated from the adjusting portion. 13 is formed, and the diameter of the elastic ring 12 is formed to be expandable / contractible by the adjusting portion 13.

Further, 14 is a lower pin guide, and this lower pin guide 14 has a hollow cylindrical guide main body 16 in which a fitting hole 15 is rotatably fitted into the left and right lower pins 3. A bowl-shaped guide body 17 curved toward the left and right lower pin arms 1 is integrally formed on the outer peripheral portion of the base end of the guide body 16. Further, a pressing portion 19 for pressing the elastic ring 12 is formed in a taper shape so as to expand outward at a base end portion 18 of the fitting hole 15 of the guide body 16, and A locking step portion 20 that is locked to the elastic ring 12 is formed at the tip of the hole 15, and a through hole 21 having a diameter larger than that of the fitting hole 15 is opened following the locking step portion 20. Is formed.

Next, when attaching the lower pin guides 14 to the left and right lower pins 3, respectively, by pushing the elastic rings 12 from the guide protrusions 8 of the left and right lower pins 3 toward the fitting groove 7, The elastic ring 12 is expanded by the adjusting portion 13, and the elastic ring 12 is easily fitted in the fitting concave groove 7. Then, the guide protrusions 8 formed at the tip portions of the left and right lower pins 3 are engaged with the tapered pressing portions 19 formed at the base end portions 18 of the fitting holes 15 of the lower pin guide 14, and the left and right When the lower pin guides 14 are forcibly pushed axially toward the respective lower pins 3, the elastic ring is formed by the tapered pressing portions 19 formed at the base ends of the fitting holes 15 of the left and right guide bodies 16. 12 is pressed and elastically deformed.

Then, the left and right guide bodies 16 are further pushed axially deeply into the left and right lower pins 3, and the base end portions 18 of the left and right guide body 16 are attached to the base end portions 4 of the left and right lower pins 3. While being moved to the position where it comes into contact with the flange 5, the fitting holes 15 of the left and right guide bodies 16 are disengaged from the elastic ring 12, and the elastic ring 12 is automatically expanded. The lower pin guides 14 are locked to the respective lower pins 3 by the elastic ring 12 by engaging with the locking step portions 16 of 16 and the left and right lower pin guides 14 are in a direction opposite to the pushing direction with respect to the respective lower pins 3. It is prevented from slipping out in the axial direction.

Therefore, the left and right lower pin guides 14 are easily fitted to the left and right lower pins 3, and the guide bodies 17 of the left and right lower pin guides 14 allow the flanges on the outer peripheral portions of the base ends of the left and right lower pins 3 to be engaged. 5, the left and right lower pin guides 14 are rotatably attached to the respective lower pins 3.

Next, when removing the left and right lower pin guides 14 from the left and right lower pins 3, the left and right lower pin guides 14 are forcibly pulled in a direction opposite to the direction in which the left and right lower pin guides 14 are pushed. Each elastic ring 12 is pressed and elastically deformed by the locking step portion 20, and the left and right guide bodies 16 are easily pulled out in the axial direction from the left and right lower pins 3.

Next, as shown in FIG. 2, when the work implement A is connected to the quick coupler 24 that is suspended by being connected to the top link 22 and the left and right lower links 23 of the tractor B, the upper end of the quick coupler 24 is connected. The top link 22 and the left and right lower links 23 of the tractor B are lifted with the connecting rod 27 provided at the upper end of the mast 26 of the working machine A engaged in the engaging recess 25 formed in the lower part from below. When the quick coupler 24 is rotated, the quick coupler 24 is rotated upward, and the working machine A is lifted by the engaging recess 25 of the quick coupler 24 while the working machine A is lifted up around the connecting rod 27. It is pulled toward the front.

Then, the left and right lower pins 3 of the working machine A have their lower pin guides 14 in the rearwardly open engagement recesses 29 formed in the left and right connecting plates 28 provided at the lower left and right ends of the quick coupler 24. When the guide bodies 16 of the left and right lower pin guides 14 make contact with the insertion ends of the engaging recesses 29 and the upper and lower parts of the engaging recesses 29, The guide bodies 16 of the left and right lower pin guides 14 are automatically fitted smoothly into the respective engaging recesses 29 while rotating with respect to the respective lower pins 3.

Further, when the guide bodies 17 of the left and right lower pin guides 14 contact the insertion ends of the left and right engaging recesses 29 and the upper and lower portions of the engaging recesses 29, the guiding action of the left and right guide bodies 17 As a result, the front portion of the work machine A is automatically swung in the left-right direction and aligned, and the guide bodies 16 of the left and right lower pin guides 14 are automatically and smoothly fitted into the respective engaging recesses 29. Reference numeral 30 in the drawing denotes a left and right lock arm that is vertically rotatable about a support shaft 32 by a handle 31, and is fitted into the left and right engagement recesses 29 by the left and right lock arms 30. The guide body 16 of the left and right lower pin guides 14 is locked. Further, 33 is a power transmission shaft for transmitting the output from the PTO shaft 34 of the tractor B to the input shaft 36 of the mission 35 provided in the working machine A. A rotary tiller 37 is rotatably provided on the working machine A. The rotary tiller 37 is rotationally driven by the output from the mission 35.

Next, in the above-described embodiment, when the work implement A is connected to the quick coupler 24 connected to the top link 22 and the left and right lower links 23 of the tractor B, first, the engaging recessed portion of the upper end portion of the quick coupler 24 is connected. The connection rod 27 of the mast 26 of the working machine A is engaged with the work piece 29, and then the working machine A is lifted by the quick coupler 24 which is rotated upward, and the left and right lower parts are fitted into the engaging recesses 29 of the left and right connecting plates 28. Although the case where the lower pin 3 is engaged via the guide body 17 of the pin guide 14 has been described, the present invention is not limited to this, and as shown in FIG. 3, the lower link 3 is lifted and rotated by the top link 22 and the left and right lower links 23. The three-point connecting portion of the working machine A may be simultaneously connected to the three-point connecting portion of the quick coupler 24.

In this case, the lower pin 3 rotatably provided with the lower pin guide 14 is projectingly provided on the left and right connecting plates 28 as the connecting members provided on the lower left and right sides of the quick coupler 24, as in the above embodiment. The connecting rod 38 is laterally fixed to the upper end of the quick coupler 24. Further, an inverted U-shaped connecting fitting 39 is fixed to the tip of the left and right lower pin arms 1 of the work machine A, and the left and right connecting fittings 39 are always projected into the connecting fitting 39. The retractable lock arm 40 urged in this manner is rotatably provided on the support shaft 41, and the inverted U-shaped connecting fitting 42 is fixed to the upper end of the mast 26 of the working machine A. Then, when the quick coupler 24 is raised and rotated by the top link 22 and the left and right lower links 23, the connecting rod 38 at the upper end portion of the quick coupler 24 is connected to the inverted U-shaped connecting metal fitting at the upper end portion of the mast 26. The lower pins 3 on the left and right sides of the lower end of the quick coupler 24 are simultaneously connected via the lower pin guides 14 to the inverted U-shaped connecting fittings 39 at the tips of the left and right lower pin arms 1. The left and right lock arms 40 have a handle 43 that rotates about a support shaft 41 against a spring (not shown).

[0022]

[Effect of device]

 According to the present invention, since the locking step portion that is locked to the elastic ring is formed at the tip of the fitting hole of the lower pin guide, the elastic ring is fitted to the inner wall of the fitting hole of the lower pin guide. Molding of the lower pin guide is easier than that of forming an annular groove. In addition, since the pressing portion that presses the elastic ring is formed in a taper shape at the base end of the fitting hole of the lower pin guide, when pressing the lower pin guide to the lower pin from the axial direction, use the pressing portion. The elastic rings can be pressed sequentially to elastically deform the elastic rings smoothly, and the lower pin guide can be easily fitted to the lower pins. In addition, the lower pin guide is deeply fitted to the lower pin, the fitting hole passes through the elastic ring, and the elastic ring is reliably locked to the locking step portion of the lower pin guide by the restoring action of this elastic ring. With this elastic ring, the lower pin guide fitted to the lower pin can be securely held and held. Further, since the elastic ring is formed with the adjusting portions which are spaced apart so that the diameter can be expanded and contracted, the elastic ring can be easily fitted into the fitting concave groove of the lower pin by the adjusting action of the adjusting portion coming into contact with and separating from the engaging portion. The elastic ring can be fitted in the fitting groove of the lower pin more easily than the elastic ring formed in series. Therefore, processing and assembly work are easy. Also, since the lower pin guide is rotatably attached to the lower pin, when connecting the quick coupler to the work machine, the quick coupler connecting part can be smoothly fitted to the lower pin guide with less frictional resistance. It is possible to prevent mutual wear due to the guiding action by the rotation of the lower pin guides.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a lower pin guide connecting device of an agricultural working machine showing an embodiment of the present invention.

FIG. 2 is a side view showing a state in which an agricultural working machine is connected to the same tractor.

FIG. 3 is a side view showing a state in which an agricultural working machine is connected to a tractor showing another embodiment. 1 Connecting member 3 Lower pin 7 Fitting groove 8 Guide protrusion 12 Elastic ring 13 Adjusting part 14 Lower pin guide 15 Fitting hole 16 Guide body 17 Guide body 19 Pushing part 20 Locking step 28 Connecting member A Working machine B Tractor

Claims (1)

[Scope of utility model registration request] 1. A connecting member for connecting a tractor and a working machine, a lower pin having a base end fixed to the connecting member and protruding in a direction intersecting with the connecting member, and rotatable to the lower pin. A lower pin guide fitted to the lower pin, and an elastic ring that locks the lower pin guide to the lower pin. The lower pin is an annular fit that fits the elastic ring to the outer peripheral portion near the tip thereof. A mating groove is formed, and a guide projection is formed at the tip of the fitting groove, the diameter of which is reduced toward the end, and the elastic ring has a shape that can be fitted into the fitting groove of the lower pin. The lower pin guide is formed in an annular shape and is formed in the middle thereof so as to be capable of expanding / contracting by forming a separated adjusting portion, and the lower pin guide is a hollow cylindrical shape having a fitting hole rotatably fitted to the lower pin. Has a guide body of
A guide body that is curved toward the connecting member is formed on the outer peripheral portion of the proximal end of the guide body, and a pressing portion that presses the elastic ring is formed in a tapered shape at the proximal end portion of the fitting hole of the guide body. A lower pin guide connecting device for an agricultural work machine, wherein a locking step portion that is locked to the elastic ring is formed at a tip end portion of the fitting hole.