JP2014084928A - Pin joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin joint that prevents the corotation of a shim for gap adjustment and in which mounting is easily performed.SOLUTION: A pin joint connects one member to another member in a rotatable manner with a pin, and adjusts a gap in an axial direction between both members by a shim passing the pin through the gap and holding it. In the pin joint, a shim 10 includes a recess part 10c extending in a radial direction on an outer peripheral edge, and the other member 8 positioned outward the shim includes a projection part 8a corresponding to the recess part 10c. The shim 10 is rotated and the recess part 10c and the projection part 8a corresponding to each other are fitted, and thereby the rotation of the shim 10 is fixed to the other member 8.

Description

  The present invention relates to a pin joint provided with a shim rotation preventing mechanism for adjusting a gap.

  For example, a work machine such as a hydraulic excavator includes a number of well-known pin joints that pivotably connect one member to the other member by a pin, and the pin joint includes a gap between one member and the other member. There is a shim that puts a pin in between and adjusts the gap in the axial direction.

  The shim includes one or a plurality of “ears” protruding outward so that an operator can grip and work with a hand to facilitate attachment to and removal from a narrow gap (for example, Patent Document 1). (See “Holding part”).

JP 2002-339946 A (FIG. 1)

  The conventional pin joint of the form as described above has the following problems to be solved in relation to this shim.

  This will be described with reference to FIG. That is, the shim 50 sandwiched between the one member 6 and the other member 8 rotates as the one member 6 rotates, and there are two ears 50a (two in the drawing) protruding outward from the shim 50. Since it rotates in contact with the other member 8, there is a problem that the coating of the contact portion of the other member 8 (within the circumference indicated by the two-dot chain line) is damaged, and rust is generated in this portion.

  The present invention has been made in view of the above-described facts, and a technical problem thereof is to provide a pin joint that prevents a shim for adjusting a gap from being rotated and that can be easily mounted.

  According to the present invention, as a pin joint that solves the above technical problem, one member is rotatably connected to the other member by a pin, and an axial gap between both members is interposed between the pins. In a pin joint that is adjusted by one or more shims, the shim has a concave portion or a convex portion extending in the radial direction on the outer peripheral edge, and the other member located outside the convex portion corresponds to the concave portion or the convex portion. Alternatively, there is provided a pin joint characterized in that a recess is provided, and the shim itself is rotated and the corresponding recess and projection are fitted to each other so that the rotation of the shim is fixed to the other member.

  Suitably, the recessed part or convex part formed in the shim is provided with the elastic deformation part which guides the united fitting to the convex part or recessed part of the other member.

  In another embodiment, one or a plurality of shims located on one member side of a plurality of shims provided are protrusions that can be bent in the axial direction on the outer peripheral edge instead of the concave or convex portions. The shim on the other adjacent member side is provided with a notch for fitting the bent projection to the outer peripheral edge and fixing the mutual rotation of the shim.

  In the pin joint configured according to the present invention, the shim includes a concave portion or a convex portion extending radially in the outer peripheral edge, and the other member located on the outer side thereof includes a convex portion or a concave portion corresponding to the concave portion or the convex portion. By rotating the shim itself and fitting the corresponding concave and convex portions, the rotation of the shim is fixed to the other member.

  Therefore, it is possible to provide a pin joint that can prevent the shim for adjusting the gap from being rotated and can be easily mounted.

1 is a cross-sectional view of a pin joint constructed in accordance with the present invention. The figure which showed (a) before rotation fixation of the shim (b) after rotation fixation seeing in the AA arrow direction of FIG. The figure which showed (a) before rotation fixation (b) after rotation fixation of the shim of another form seeing in the AA arrow direction of FIG. Sectional drawing of the pin joint which shows other suitable embodiment at the time of providing multiple sheets of shim. FIG. 5 is a diagram showing another form of (a) a shim on one member side, (b) a shim on the other member side, and (c) a shim on one member side as viewed in the direction of arrows BB in FIG. 4. (A) of the conventional pin joint is sectional drawing, (b) is sectional drawing seen in the CC arrow direction of (a).

  Hereinafter, a pin joint constructed in accordance with the present invention will be described in further detail with reference to the accompanying drawings illustrating preferred embodiments.

  A description will be given with reference to FIG. The pin joint shown as a whole by the number 2 is pinched through the pin 4 to adjust one of the members 6 to the other member 8 by the pin 4 and adjust the clearance in the direction of the axis X between the members 6 and 8. It has shim 10.

  The description will be made with reference to FIG. 2 together with FIG. 1, mainly with reference to FIG. The shim 10 is formed in a substantially circular shape by stamping and forming a flat steel plate. A pin insertion hole 10a is formed at the center of the circle. On a part of the outer peripheral edge, a pair of outwardly protruding ears 10b and 10b are formed at intervals of 90 ° so that the operator can grasp them by hand when attaching and detaching the shim.

  A concave portion 10c extending in the radial direction is formed on the outer peripheral edge of the pair of ears 10b, 10b on the opposite side in the circumferential direction. The concave portion 10c includes an L-shaped portion 10d that is recessed inward from the outer peripheral edge of the shim 10 body, and an elastically deforming portion 10e that extends in the shape of a belt around the outer peripheral edge of the shim 10 main body and enables deformation in the radial direction (arrow Y). And the tip of the.

  The other member 8 located outside the recess 10c has a protrusion 8a extending in the axis X direction in which the recess 10c is fitted when the shim 10 is rotated (arrow Z) about the pin 4. I have.

  When the operator rotates the shim 10 in the state of FIG. 2A around the pin 4 by placing a finger on the ear 10b (arrow Z), the tip of the elastically deforming portion 10e of the shim 10 is the other member. 8 is in contact with the convex portion 8a, elastically deformed inward, and overcomes, as shown in FIG. 2 (b) “after rotation and fixing”, the concave portion 10c and the convex portion 8a are fitted, and the shim 10 is rotated. The movement is fixed to the other member 8. Since the shim 10 is sandwiched between one member 6 and the other member 8, even a thin shim can be elastically deformed without turning up.

  Another embodiment of the shim will be described with reference to FIG. First, a description will be given with reference to FIG. The shim 20 includes a convex portion 20a in place of the concave portion 10c extending in the radial direction of the shim 10 described above, and the shim 20 is rotated around the pin 4 on the other member 8 positioned outside the convex portion 20a. A concave portion 8b extending in the direction of the axis X in which the convex portion 20a is fitted when moved (arrow Z) is provided. Since the shape of the other part of the shim 20 is the same as that of the shim 10, description thereof is omitted.

  The convex portion 20a has an L-shaped portion 20b that is recessed inward from the outer peripheral edge formed on the shim 20 main body, and the outer peripheral edge extends from the shim 20 main body in a strip shape and can be deformed in the radial direction (arrow Y direction). The elastic deformation part 20c which has the convex part 20a adjacent to the shape part 20b is provided.

  When the operator turns the shim 20 in the state of FIG. 3A around the pin 4 with his / her fingers on the ear 10b (arrow Z), the shim 20 is shown in FIG. As described above, the convex portion 20 a at the tip of the elastically deforming portion 20 c of the shim 20 falls into the concave portion 8 b of the other member 8 and the rotation of the shim 20 is fixed to the other member 8.

  The shim 10 (20) in the above embodiment is one in FIG. 1 showing the assembled state, but may be a plurality.

  Next, another preferred embodiment of the pin joint 2 having a plurality of shims will be described with reference to FIGS. In this case, one or a plurality of shims 30 (one in the figure for ease of understanding) located on one member 6 side of the plurality of shims 30 and 40 are recessed portions of the shims 10 and 20. In place of 10c or the convex portion 20a, a protrusion 30a that can be bent in the direction of the axis X is provided on the outer peripheral edge, and a shim 40 on the other member 8 side (similarly, one in the drawing) is bent to the outer peripheral edge. The protrusion 30a is fitted with a notch 40a for fixing the mutual rotation of the shims 30 and 40.

  The protrusion 30a of the shim 30 is formed by cutting the outer peripheral edge between a pair of ears 30b and 30b corresponding to the ears 10b and 10b of the shim 10 with a width W and a height H with the tip as the outer peripheral edge. Has been. The cutout portion 40a of the shim 40 is formed in a rectangular groove shape in which the bent projection portion 30a is fitted between a pair of ears 40b and 40b corresponding to the ears 10b and 10b of the shim 10 on the outer peripheral edge. Yes.

  When a plurality of shims 30 are provided, as shown in FIG. 5C, the shim 30 includes a pair of protrusions 30a and notches 40a, and the protrusions 30a and notches 40a of the adjacent shims 30 and 30 are fitted. Combine to fix the rotation.

  The effect of the pin joint 2 as described above will be described.

  In the pin joint 2 configured according to the present invention, the shim 10 (20) includes a concave portion 10c (convex portion 20a) extending in the radial direction on the outer peripheral edge, and the other member 8 positioned on the outer side thereof has the concave portion 10c (protrusive portion). A protrusion 8a (recess 8b) corresponding to the portion 20a), and by rotating the shim 10 (20) itself and fitting the corresponding protrusion and recess, the rotation of the shim 10 (20) It is fixed to the member 8.

  Accordingly, it is possible to provide a pin joint 2 that is easy to mount because the shim for adjusting the gap is prevented from being rotated and the rotation can be fixed by rotating the shim itself.

  Further, the concave portion 10c or the convex portion 20a formed in the shim 10 or 20 includes the elastic deformation portion 10e or 20c for guiding the unitary fitting of the other member 8 to the convex portion 8a or the concave portion 8b. With the structure, the rotation of the shims 10 and 20 can be fixed to the other member 8 easily and reliably.

  Further, in another embodiment in the case where a plurality of shims are provided, one or a plurality of shims 30 located on one member 6 side of the plurality of shims provided (one illustration is shown for ease of understanding). ) Is provided with a protruding portion 30a that can be bent in the direction of the axis X on the outer peripheral edge instead of the concave portion 10c or the convex portion 20a, and a shim 40 on the other member 8 side (similarly, one is shown). The outer peripheral edge is provided with a notch 40a that is fitted with the bent protrusion 30a and fixes the mutual rotation of the shims 30 and 40.

  Therefore, it is possible to reliably prevent the shim 30 and the shim 40 from being rotated together when a plurality of shims are provided.

2: Pin joint 4: Pin 6: One member 8: The other member 8a: Convex part 8b: Concave part 10: Shim 10c: Concave part 10e: Elastic deformation part 20: Shim 20c: Elastic deformation part 20a: Convex part 30: Shim 30a: protrusion 40: shim 40a: notch 50: shim

Claims (3)

In a pin joint in which one member is rotatably connected to the other member by a pin and an axial gap between the two members is adjusted by one or a plurality of shims sandwiching the pin therebetween.
The shim comprises a concave or convex portion extending radially on the outer periphery;
The other member located on the outside includes a convex portion or a concave portion corresponding to the concave portion or the convex portion,
By rotating the shim itself and fitting the corresponding concave and convex portions, the rotation of the shim is fixed to the other member.
Pin joint characterized by that. The concave portion or the convex portion formed in the shim includes an elastic deformation portion that guides the united fitting into the convex portion or the concave portion of the other member.
The pin joint according to claim 1. One or a plurality of shims located on one member side of a plurality of shims,
In place of the concave portion or the convex portion, the outer peripheral edge is provided with a protrusion that can be bent in the axial direction,
The shim on the other member side adjacent to the outer peripheral edge is provided with a notch for fitting the bent projection and fixing the mutual rotation of the shim.
The pin joint according to claim 1 or 2, wherein

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