JPH0366912A - Pin joint gap adjustment device - Google Patents

Abstract

PURPOSE:To easily adjust a gap by inserting a shaft pin through shaft holes of first and second bosses, providing a circular gap adjusting member and a cover on one end of the shaft pin, and moving the circular gap adjusting member in the side direction of the second boss while pressurizing it by means of grease supplying. CONSTITUTION:A second boss 7 is fitted between right and left supporting legs 1b, 1a of a first boss 1, and a shaft in 10 is inserted. One end of the shaft pin 10 is fixed to a shaft hole 4a. The other end is journalled by a shaft hole 4b of a circular gap adjusting member 3. The shaft pin 10 is rotatably slid against the shaft hole 4b and a shaft hole 8 of the second boss. The side of the supporting leg 1b is sealed by a cover 1. When a gap is generated between the first and second bosses, grease is supplied from a grease nipple 14 of the cover 11. The grease is intruded into the gap between the cover and an end face of the shaft pin to pressurize and move the gap adjusting member 3, abut it against a bush 9b with a flange of the second boss for adjusting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clearance adjustment device for a pin joint in a packet support portion of a construction machine, particularly a hydraulic excavator.

(Prior Art) In general, working machines of construction machinery perform excavation, dozing, or loading work in earth, sand, and muddy water. Because of this, the soil is easily covered by dirt, and since the packets loaded with dirt are rocked up and down and back and forth, there is considerable wear and tear, which has traditionally caused dirt to enter the joint pin through the gap in the packet bracket support arm. Various efforts have been made to prevent this or to adjust gaps caused by wear. Figure 4 is an example of this,
The end of a second boss d such as a packet bracket is inserted through the bush C of a joint pin b press-fitted into the end of a first boss a of a support arm, etc., and an O-ring e1 is inserted between these two bosses. A shim g is inserted for oil supply and gap adjustment using a grease nipple f.

(Problem to be Solved by the Invention) However, in the above conventional pin joint, the O-ring e
In the case of the seal, since the O-ring itself is made of a rubber material, it is severely deteriorated by dirt and sand, and cannot prevent the infiltration of dirt and muddy water for a long period of time, and furthermore, there is no gap adjustment function. Also,
Even when adjusting the gap using the shim g, it was necessary to remove and install the joint pin b each time.

Of course, in order to solve this problem,
754 and Japanese Utility Model Application No. 61-97619, an automatic gap adjustment device has been proposed in which a ring-shaped collar made of spring steel is inserted between the bosses formed in the taper gap instead of the O-ring. According to the above, the spring ring diameter is automatically reduced as the gap increases by a combination of a gap taper and an open annular ring, and moves inward to the taper gap to adjust the gap. If the spring force in the radial direction is weak, it will easily open and move outward due to the thrust force, whereas if it is too strong, the gap will be completely tightened and the second boss of the packet etc. will not be able to rotate, which will also cause noise. The disadvantage is that it occurs.

The present invention has been made in order to improve the above-mentioned problems, and it is an object of the present invention to provide a joint pin gap adjustment device that makes it possible to adjust the gap in the longitudinal direction of the joint pin by adjusting the grease.

(Means and effects for solving the problem) In order to achieve the above object, the present invention has a second boss fitted between the left and right support legs of the first boss, and a shaft pin inserted into the shaft hole of both bosses. Further, an annular gap in which one end of the shaft pin is fixed in one shaft hole of the first boss, and the other end is fitted into the other shaft hole of the first boss so as to be movable in the axial direction. Both bosses are pivotally supported via an adjustment member, and a cover is attached in a sealed manner to the outer surface of the first boss support leg on the side where the gap adjustment member is fitted, and the gap is closed by applying grease. The adjustment member was pressed and moved to the side of the second boss to adjust the gap between both bosses, and a holder having a shaft hole bored therein was installed between the left and right front legs. A second boss is fitted between the front legs of the first boss, a shaft pin is inserted into the shaft hole of both bosses so as to be movable in the axial direction, and the grease is supplied from the grease nipple attached to one of the holders. By pressing the end face of the shaft pin with grease, the annular flange formed on the outer circumference of the shaft pin moves to the side of the second boss, adjusting the gap between both bosses, and By supplying grease from a grease nipple installed on the side of the gap created in between,
The present invention provides a pin joint in which the gap between the two bosses is adjusted as desired by moving a gap adjusting member or a flange formed on the shaft pin in the axial direction by the pressing force of the grease.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, l is the first boss of a support arm, etc., and a large-diameter hole 2 is bored in one of the bifurcated left and right front supporting legs 1a and 1b of the boss. Then, the large diameter hole 2
An annular gap adjusting member 3 that can be moved in the axial direction is loosely fitted into the gap adjusting member.A shaft hole 4b is formed in the axial center of this gap adjusting member, and an annular collar portion 5 is formed in the inner part. A seal member 6 is provided on the sliding surface with the large diameter hole 2.

Reference numeral 7 denotes a second boss fitted between the left and right supporting legs 1a and lb of the first boss 1, and flanged bushes 9a and 9b are inserted into the shaft hole 8 bored in the boss from both sides. It is. And the above 1. Axial holes 4a, 4b, 8 of second boss 1.7
A shaft pin 10 is inserted into the shaft hole 4a of the first boss 1, and one end of the shaft pin 10 is fixed to the shaft hole 4a of the first boss 1 to prevent extraction. The shaft hole 4b of the annular gap adjustment member 3 fitted into the shaft hole 1b and the shaft hole 8 of the second boss 7 can slide and rotate.

Reference numeral 11 denotes a cover attached with bolts 12 so as to close the large diameter hole 2 of one of the supporting legs 1b of the first boss 1. The cover 11 has a gasket 13 interposed therein and is attached to the cover 11 in a completely sealed state, and a grease nipple 1 is provided in the center.
4 is attached.

15 is a grease nipple for lubricating the sliding surface between the shaft pin 10 and the shaft hole 8 of the second boss 7 with grease, and 16 is an oil passage thereof. Further, 17a and 17b are O-rings inserted into the gaps between the first boss 1 and the second boss 7, respectively, and one O-ring 17a is the first boss support leg 1a on the fixed side of the shaft pin IO. The other O-ring 17b is inserted into the V-shaped cross-section gap formed by the taper formed in the spacer 18 provided on the one side and the flanged bush 9a of the second boss 7, respectively. It is inserted into a V-shaped cross-sectional gap formed by a taper formed in the flanged bush 9b and the flange portion 5 of the annular gap adjustment member 3, respectively, to prevent the intrusion of earth and sand and the outflow of lubricating oil.

Next, referring to the above configuration, how to adjust the gap using the pin joint is as follows: When a gap larger than the allowable dimension is generated between the first boss 1 and the second boss 7, the grease nipple 14 for gap adjustment is
When grease is supplied with a grease gun or the like, the grease enters the gap between the end surface of the shaft pin 10 and the cover 11, and from there presses the side surface of the gap adjustment member 3 on the outer periphery of the shaft pin. Due to the pressure of this grease, the gap adjustment member 3 slides between the shaft pin 10 and the first boss support leg 1b, and moves in the axial direction while being pressed to the right in the figure by the gap adjustment dimension, and moves to the second boss. The gap is adjusted by coming into contact with the side of the flanged bush 9b of No. 7. Then, after completing the gap adjustment, the adjustment will be performed in the same manner when the next adjustment time comes.

FIG. 2 shows a second embodiment, in which a grease nipple 24 for applying grease that presses the gap adjustment member 3 is connected to a shaft pin 20.
Grease is supplied to the sliding surface of the second boss 7 through the oil passage 22a and from the shaft end of the cover 21 through the oil passage 22b on the other side. It is fed into the gap with the inner surface and also presses the side surface of the gap adjustment member 3.

Furthermore, FIG. 3 shows a third embodiment, whereas in the previously described embodiments, the gap between both bosses is adjusted by pressing a separately provided gap adjustment member with grease. ,
In this embodiment, as shown in the figure, the end face of the shaft pin supported movably in the axial direction is pressed with grease, and the gap between both bosses is adjusted by the flange formed on the outer circumference of the shaft pin. Specifically, the holder 31a has shaft holes 33a, 33b opened inwardly in the holes 32a, 32b bored in both the left and right supporting legs 1a, lb of the first boss 1;
31b and is attached to the front legs 1a, lb of the first boss 1 with bolts 34.

The second boss 7 is fitted between these opposing holders 31a and 31b, and these shaft holes 33a.

Both bosses 1.7 were pivotally supported by the shaft pins 30 inserted into the shaft pins 33b and 8, and grease was supplied to the end gaps of the shaft pins 30 from the grease nipples 35 attached to one of the holders 1b. Furthermore, due to the pressing force of the grease, the shaft pin 30
By pressing, the annular flange 36 formed on the outer periphery of the shaft pin is moved to the side of the second boss 7, thereby adjusting the gap between the two bosses 1 and 7. This movement of the shaft pin 30 creates a gap between the contact surface 37 between the end of the holder 31b and the flange 36, but this opened gap is filled by the O-ring 38, which is fitted between the ends, and the tapered surface. The diameter is reduced in the radial direction by force so as not to interfere with the seal. Note that 39 is a grease nipple for lubricating the sliding surface between the second boss 7 and the shaft pin 30.

(Effects of the Invention) Since the present invention is constructed as described above, the gap created between both bosses of a pin joint can be easily adjusted without the need for labor-intensive shim adjustment by attaching and detaching the shaft pin as in the past. The gap can be adjusted by applying grease, and since it is a grease adjustment, the adjustment can be made freely as desired.

Moreover, since it is a grease adjustment, it can be performed as a daily maintenance work at the same time as the grease supply that lubricates the sliding surfaces.

[Brief explanation of drawings]

1 to 3 show embodiments according to the present invention, FIG. 1 is a sectional view showing the first embodiment, FIG. 2 is a sectional view showing the second embodiment, and FIG. 3 is a sectional view showing the third embodiment. A sectional view showing an example. FIG. 4 is a sectional view showing a conventional example. 1...1st boss, la, lb...1st boss support leg, 3
... Annular gap adjustment member, 10.20.30 ... Axis pin, 11 ... Cover 14.15, 24, 35.39
...Grease nipple, 31a, 31b...Holder. Figure 1 Figure 2

Claims (4)

[Claims] (1) Fit the second boss between the left and right supporting legs of the first boss, insert the shaft pin into the shaft holes of both bosses, and insert one end of the shaft pin into the shaft hole of the first boss. By fixing the two bosses together, the two bosses are pivotally supported via an annular gap adjusting member whose other end side is fitted into the other shaft hole of the first boss so as to be movable in the axial direction, and the gap adjusting member A cover is attached in a sealed state to the outer surface of the first boss support leg on the side where the two bosses are fitted, and then the gap adjustment member is pressed by applying grease and moved to the side of the second boss. A gap adjustment device for a pin joint, characterized in that the gap between bosses is adjusted. (2) Claim (1) characterized in that a grease nipple for supplying grease for pressing and moving the gap adjustment member is attached to a cover attached to the outer surface of one of the support legs of the first boss.
) Gap adjustment device for pin joints as described. (3) The gap adjustment device for a pin joint according to claim 1, characterized in that a grease nipple for supplying grease for pressing and moving the gap adjustment member is installed on the end face of the shaft pin on the fixed side. (4) The second boss is fitted between the two supporting legs of the first boss, which is fitted with a holder that has shaft holes that open inwardly on both the left and right supporting legs, and can be moved in the axial direction into the shaft holes of both bosses. The annular flange formed on the outer periphery of the shaft pin is pushed through the second holder, and the end face of the shaft pin is pressed with grease from the grease nipple attached to the one holder. A gap adjusting device for a pin joint, characterized in that the gap between both bosses is adjusted by moving to the side of the boss.