JPH083472Y2 - Vibration prevention device for pin connection - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a vibration prevention device for preventing vibration between connecting members such as a pin connecting portion that connects between links of a link mechanism that operates a working machine such as a power shovel. It is about.

[Conventional technology]

Regarding the structure of the pin boss part in the pin connecting part that connects each link of the link mechanism that operates the work machine such as the conventional power shovel, the pin boss of one connecting member and the other, as in Japanese Utility Model Laid-Open No. 61-97619, are used. An attempt is made to eliminate this by placing an annular spring in the gap between the end surface of the connecting member facing the pin boss and limiting axial vibration.

[Problems to be solved by the device]

The above-mentioned conventional technique uses the opposing end face gaps of the pin boss portions as radial gaps, and as the radial gap changes in size, the annular spring is expanded and contracted in the radial direction to have a sealing function of shielding the gap, Vibration is prevented by filling the axial gap of the pin boss. Since the annular spring is made of metal, it does not exhibit a good sealing effect with the radial surface of the pin boss end surface that makes contact with the metal, and the annular spring sandwiched in the gap between the relative rotating pin boss end surfaces wears the pin boss end surface. There is a problem of promoting it.

Further, this prior art is an annular spring that fills the gap between the opposed end faces of the pin boss portion, and does not exhibit the function of suppressing axial and radial vibrations of the pin boss portion by the spring force.

[Means for solving the problem]

In a pin connecting portion that connects between links of a link mechanism that operates a work machine such as a power shovel, a pair of left and right pin bosses included in one connecting member that is connected by a pin and a pin boss included in the other connecting member The end face of the pin boss part is formed by forming a circumferential groove that includes the radial bottom surface by combining the end faces facing each other in a pair, and freely inserting an elastic annular body made of a rigid elastic metal ring covered with a covering ring into the circumferential groove. A vibration preventing device for a pin connecting portion is characterized in that the gap is narrowed and the elastic annular body is expanded in the radial direction to suppress the vibration of the pin boss portions in the axial direction and the radial direction.

[Action]

With the above configuration, the elastic annular body housed in the circumferential groove formed between the pin boss opposing end surfaces having the radial bottom surface does not have an elastic reaction force at the time of housing mounting, and one pin boss is forced in the axial direction. By moving, the width of the radial bottom surface in the circumferential groove is reduced and the radius of the contact surface of the radial surface that contacts the inner diameter of the elastic annular body is expanded, and a radial expansion force is applied to the elastic annular body. Thus, elastic restoring force is obtained.

The elastic restoring force becomes a reaction force in the axial direction and the radial direction by the component force action of the radiation surface of the end surface of the pin boss portion in contact, and strongly holds the left and right radiation surfaces tightly. The elastic annular body is located in the circumferential groove between the pin boss opposing end surfaces on both the left and right sides of the pin connecting portion, and prevents the pin boss portion from moving in the axial direction by the wedge action, and the elastic movement of the pin boss portion in the radial direction. Elastically clamped by the inner diameter of the body to suppress the gap backlash with elastic force to damp vibration early.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.
Fig. 1 shows a power shovel working machine device, Fig. 2 shows a pin connecting portion of a machine operating link, Fig. 3 shows a shape of a groove 13 of a pin 11, and Fig. 4 (a) shows an elastic annular body. 40 is a side view, FIG. 4 (b) is a bb sectional view of FIG. 4 (a), and FIG. 5 is a radial bottom surface of the bin boss portions 21R, 21L, 23.
FIG.

In the figure, reference numeral 60 is a working machine lifting arm, 70 is a working machine (bucket), and 80 is a machine working link including a double-acting hydraulic cylinder 71 for lifting and lowering the working machine. The mechanical operation link 80 is composed of a tilt lever 81 whose one end is pivotally supported by the elevating arm 60, and a tilt rod 82 which is connected to the other end of the tilt lever 81 and whose other end is connected to a connecting bracket 72 of the working machine 70. Become.
The working machine 70 is pivotally connected to the tip D of the working machine lifting arm 60, and is lifted and lowered by the above-mentioned mechanical operation link 80. This mechanical operation link 80 is connected by a pin connecting portion, and has a pair of coaxial cores with a space therebetween, and a tilt lever 81L,
The pin boss portions 21L and 21R respectively welded to 81R, and the pin boss 23 and bush 23B sandwiched between these are formed. The pin bosses 21L and 21R are provided at both end portions of the tilt levers 81L and 81R in the mechanical operation link 80, and the pin boss portion 23 is a cylindrical bearing body provided at both end portions of the tilt rods 82L and 82R. Pin 11 is a combination of pin bosses 21R, 23, 21L
To form a mechanical operation link 80, and the grooves 13 are provided in the radial direction at the ends of these pins 11, and the plate is provided in the groove 13.
P1 is inserted and fixed to the tilt lever 81L with the bolt B1 to prevent the pin 11 from rotating. Pin boss 23
Has a bush 23B and freely rotates with respect to the pin 11. The assembly of the pin 11 and the pin boss portions 21R, 23, 21L is manufactured and processed with a dimensional relationship with play to avoid interference due to manufacturing error and to facilitate artificial assembly connection,
The pin 11 and the pin bosses 21R, 21L are provided with play (gap play) in the axial direction S and the radial direction R when they are assembled. The elastic annular body 40 is a cutting portion 40c obtained by cutting a part of the annular shape.
Rigid metal material 40a that has a radius and causes rigid elastic deflection in the radial direction
And a covering ring 40b having a V-shaped cross section and made of a urethane material that covers both the inner diameter side and the both sides of the rigid metal material 40a, and exerts an elastic restoring force against the expanding deformation force in the radial direction. This elastic annular body 40 has pin boss portions 21R, 23, 2
Radial bottom surface 30 formed on the outer peripheral side of the facing end surfaces 30A and 30B of 1L
It is fitted in the circumferential groove of and the radial bottom surface 30a, 30b
It is accommodated via an anti-wear ring 35 installed at. The wear prevention rings 35, 35-1 are in close contact with the slopes 30c, 30d and the pin boss end faces 30A, 30B, and rise from the outer periphery of the radial bottom surface 30 and are bent to wrap the elastic annular body 40, and also on the pin boss end faces 30A, 30B. It is a ring-shaped structure having a protrusion of the rotation stopper 35a at the contacting portion. The end surface of each pin boss 23
30A and the end faces 30B of the pin bosses 21R and 21L are provided with holes into which the protrusions of the rotation stopper 35a are fitted. Further, the elastic annular body 40 has an inner ring diameter smaller than the diameter of the pin boss portions 21R, 23, 21L,
The diameter of the radial bottom surface 30 is larger than the bottom side diameter of the slope, and as a result, the elastic annular body 40 housed at the same position has the pin boss portion 21.
When the gaps 30e between the end faces of R, 23, 21L are fitted, the radial slopes 30a, 30b approach each other, the elastic annular body 40 is pushed along the slopes, and elastic deformation force in the radial direction R is applied. This elastic deformation force is applied as a restoring force to the groove slopes 30a, 30b and the slopes 30c, 30d of the wear prevention ring 35, and is divided by the axial direction S and the radial direction R. In this action, the reaction force that is divided in the axial direction S acts on both end faces of the pin bosses 21R, 23, 21L to resist the movement of the pin boss 23, while the reaction force that is divided in the radial direction R is the pin boss portion 23. Radial direction R formed by the inner diameter of bush 23B and pin 11
Elastically holds the gap.

Also, the reaction force that is divided in the radial direction R is the pin boss 21R, 23, 2
It also provides frictional resistance against 1L relative rotation, suppressing free rotation and play. Next, a description will be given of the reaction force applying component as the elastic applying means 50 in the radial direction with respect to the elastic annular body 40.

A plate P2 is brought into contact with the outer end of the link 81R, a bolt B2 penetrating the plate P2 is screwed in the axial direction of the pin 11, and a pair of left and right pin bosses 21R and 21L are formed as a pin 11 rotation stop plate P1. The pin boss parts 21R and 21L are relatively moved in the axial direction of the pin 11 by the screwing propulsion action of the pinch bolt B2 with P2, and this movement causes the clearance between the end faces of the pin boss parts.
Elastic ring 40 on each slope that can narrow 30e
Is expanded in the radial direction R to obtain an elastic restoring force.

[Effect of device]

As described above, according to the present invention, vibration and noise can be prevented by eliminating looseness in the axial direction, radial direction and free rotation in the connecting pin portion, and the annular coating 40b is a seal for preventing intrusion of earth and sand from the outside. Is effective as
The wear prevention ring 35 can also suppress wear of the pin boss portions 21R, 23, 21L.

[Brief description of drawings]

Fig. 1 shows a power shovel working machine device, Fig. 2 shows a pin connecting portion of a machine operating link, Fig. 3 shows a shape of a groove 13 of a pin 11, and Fig. 4 (a) shows an elastic annular body. 40 is a side view, FIG. 4 (b) is a sectional view taken along line bb of FIG. 4 (a), and FIG. 5 is a radial bottom surface 30 of the pin boss portions 21R, 21L, 23.
FIG. 11 …… Pin 21R, 21L, 23 …… Pin boss 30 …… Radial bottom 31 …… Circular groove 40 …… Elastic ring 40a …… Rigid elastic metal ring 40b …… Coating ring

Claims (2)

[Scope of utility model registration request] 1. A pair of left and right pin bosses included in one connecting member that is connected by a pin in a pin connecting portion that connects between links of a link mechanism that operates a working machine such as a power shovel, and the other connecting portion. A pair of opposing end faces of the pin boss included in the member is combined to form a circumferential groove including a radial bottom surface, and an elastic annular body composed of a rigid elastic metal ring covered with a covering ring in the circumferential groove is free. A vibration preventive device for a pin connecting portion, characterized in that the elastic annular body is expanded in the radial direction by inserting and pinching the end face gap of the pin boss portion, and suppressing the axial and radial vibrations of the pin boss portions. . 2. A vibration preventive device for a pin connecting portion, wherein the cover ring is an annular cover having a V-shaped cross section.