JPH04121519U - Bearing device for pin connections of construction machinery - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent foreign matter such as dirt from entering through the gap between the swinging boss and the fixed boss and the gap between the pin and the fixed boss, and to save labor by preventing internal lubricant from flowing out. We aim to make this possible. [Structure] A pin 19 is inserted through the swinging boss 17 and the fixed boss 18 to connect both bosses 17 and 18. Both bosses 1
Flange bushes 23 and 24 are provided at the joint portions 7 and 18, and seals 35 and 35 are fitted into both flanges facing each other to bring the seals into close contact with each other. End cap 42 and fixed boss 18
A shim 44 is interposed between the outer end surface of the fixed boss and the flanged bush 24 on the fixed boss side to be movable so that the gap between the joints can be adjusted.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea uses a fixed boss and a swinging member to connect a rotating member to a fixed member of a construction machine. This is related to the bearing device of the pin connection part when the pin is inserted into the moving boss and connected. be.

0002

[Conventional technology]

Figure 1 shows the hydraulic excavator section of construction equipment, with a bucket at the end of arm 1. Pivotally connect one connecting part 3 of the bucket 2 to the top boss 4 of the bucket cylinder. The other connecting portion 6 of the bucket 2 is pivotally connected by connecting the links 5. top boss 4 and the arm 1 are connected by an arm link 7.

0003 Figure 2 shows a cross section of the main part of the pin connection part of a conventional construction machine, and shows the top boss 4 and Regarding the connection side of the bucket link 5, the bucket link 5 is attached to both sides of the top boss 4. The swinging bosses 8, 8 of the link 5 are arranged, and both sides thereof are fixed at one end of the arm link 7. A pin 10 is inserted into each of the bosses 4, 8, and 9. Top Fitting the bush 11 into the push boss 4 and fitting the bush 12 into the swing boss 8, A grease nipple 13 is provided on each boss to supply grease to the internal grease reservoir 14. It is designed to inject.

0004 A locking bolt 15 is inserted through the end of the pin 10 into one of the fixing bosses 9. The pin 10 is supported by the fixed boss 9. And top boss 4 and swinging boss 8, the joint between the swing boss 8 and the fixed boss 9, and the fixed boss 9 and the pin 1. Since there is a gap between each bush 11 and 12, the swinging parts of each bush 11 and A seal 16 is fitted into each bush to prevent foreign matter from entering.

[0005]

[Problem that the idea aims to solve]

The above-mentioned conventional pin connection bearing device has a pin 10 and bushes 11 and 12. Grease must be replenished periodically to lubricate the swinging parts. depending on the case had to be lubricated every day, making maintenance time-consuming. Furthermore, lubrication If the grease overflows or leaks from the seal when This not only contaminates the bearing equipment, but also contaminates the environment around the construction site (e.g. In some cases, spills of oils and fats into rivers may occur.

[0006] Also, the gap between the joint between the swinging boss 8 and the fixed boss 9 or between the fixed boss 9 and the pin 10 Foreign matter such as rainwater and earth and sand may enter the pin joint, and the seal may deteriorate due to wear and tear in the pin connection. Due to the damage, such foreign objects may enter the inside of the bushings 11 and 12 and damage the pin 10 and the bushings. This may damage the shoes 11 and 12, causing abnormal wear or jamming of the sliding parts. Ru.

[0007] Therefore, it is possible to reduce the labor of greasing work, prevent pollution of the surrounding environment, and This prevents foreign matter from entering the sliding part from outside the bush, and prevents the bearing device of the pin connection part from entering. There are technical issues that need to be solved in order to improve lifespan, and this invention The purpose is to solve this problem.

[0008]

[Means to solve the problem]

This idea was proposed to achieve the above purpose, and the fixed member is rotated. To connect parts, a swing boss is fixed to one member and a fixed boss is fixed to the other member. and clamp the swinging boss, insert a pin through both bosses, and attach the pin to the fixed bolt. It has a pin connection structure supported by a bushing, and a flanged bushing is attached to the joint part of both bosses. Annular grooves are formed facing each other on the abutting surfaces of the flanged bushes, and the annular grooves are At the same time, fit an elastic seal around the outer periphery of the joint of the flanged bush. The oil reservoir is provided in both bosses to lubricate the sliding surface between the boss and the pin, and then At the same time, a seal is fitted to the inner peripheral surface near the outer end of the fixed boss, and both ends of the pin are fitted. An end cap is bolted to the surface, and the end cap is connected to a fixed boss or flange. A shim is interposed between the outer end surface of the flanged bushing and the flanged bushing on the fixed boss side is moved in the axial direction. Provided is a bearing device for a pin connection part of a construction machine, characterized in that it is formed to be movable. It is something to do.

[0009]

[Effect]

A flanged bush is provided at the joint between the swing boss and the fixed boss, and the joint between both bosses is An elastic seal is inserted into the outer periphery of the contact area, so rainwater, dirt, etc. from the outside can be prevented. It can prevent things from entering. Seats are provided in annular grooves on the contact surfaces of the flanged bushes. This prevents the lubricant on the sliding surface of each flanged bush from flowing out. This improves lubricant retention and reduces greasing work.

0010 In addition, if the contact surface of the flanged bush wears out, looseness will occur between both seals. Foreign objects may easily enter and there is a risk of lubricant flowing out, but the end cap and fixed boss By inserting a shim between the outer end surface of The end faces of both flanged bushes come into contact with each other, and the system The comrades will also be in close contact with each other, and the backlash will be resolved.

[0011]

【Example】

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. For convenience of explanation, the conventional technique Components that are the same as those explained in the section will also be explained at the same time. Figure 1 shows the hydraulic shock of construction machinery. The bell part is shown, and one connecting part 3 of the bucket 2 is pivotally attached to the tip of the arm 1. , connect the bucket link 5 to the top boss 4 of the bucket cylinder, and connect the bucket link 5 to the top boss 4 of the bucket cylinder. The other connecting portion 6 of the bucket 2 is pivotally attached to the tip of the bucket 5. The arm 1 and the top The boss 4 and the bucket link 5 are connected to the arm link 7 by a pin connection section described later. connected.

0012 As shown in FIG. 3, if the arm link 7 is used as the main body, the arm link 7 becomes the fixed part. Arm 1, top boss 4, and bucket link 5 is a rotating member. On one end side of the arm link 7, both sides of the top boss 4 The swinging bosses 17, 17 fixed to the bucket link 5 are arranged, and the arms are attached on both sides. Fixed bosses 18, 18 fixed to one end of the link 7 are sandwiched, and the respective bosses 4, 17, A pin 19 is inserted into 18. Also, on the other end side of the arm link 7, the arm A fixed boss whose both sides of the swing boss 20 which is fixed to the arm link 7 is fixed to the other end of the arm link 7. A pin 22 is inserted into each of the bosses 20 and 21.

[0013] As shown in Figure 3, the bearing device of the pin connection part is shaped symmetrically with respect to the center line L. Therefore, in FIG. 4, approximately the left half of one end of the arm link 7 is shown. and explain. Swing boss 17 of bucket link 5 and fixed boss of arm link 7 Flange bushes 23 and 24 are provided at the joint portion of No. 18 so that the respective flanges face each other. , fit the grease-free bushing 25 into the top boss 4. On both sides of the non-greasing bushing 25 is fitted with a dust seal 26 to prevent foreign matter from entering and to retain internal lubricant. Ru. A stepped portion 27 is provided on the outer peripheral edge of the flange portion of the flanged bush 23 and on the inner surface of the swing boss 17. , 27 are provided, and elastic seals such as O-rings 28, 28 are attached to the respective stepped portions 27, 27. to prevent foreign matter from entering the joint of the boss.

[0014] The swing boss 17 is provided with an oil reservoir 29, into which a lubricant such as grease is filled. The plug 30 closes the lubricant into the oil groove 31 provided on the sliding surface of the flanged bush 23. It is arranged to be supplied. Then, apply oil to the end of the flanged bush 23 on the center line L side. The seal 32 and dust seal 33 are fitted to prevent internal lubricant from leaking and to prevent foreign matter from entering. We are trying to prevent people from entering. An annular groove is formed on the contact surface between the flange of the flange bushing 23 and the fixed boss 18. 34, 34 facing each other, and a composite of an elastic body and a metal body is inserted into the annular grooves 34, 34. The end face seals 35, 35 formed by the body are inserted, and the respective seals 35, 35 are opposed to each other. and touch it. The annular grooves 34, 34 are the sliding surface of the pin 19 and the fitting part of the O-ring 28. Depending on the shape of the flanged bushes 23 and 24, the flanges may be located approximately in the middle of each other. An annular groove 34, 34 may be provided in the groove.

[0015] The fixed boss 18 includes an outer cylindrical portion 18a connected to the arm link 7 and a flanged bush. 24 is fixed to the inner cylinder part 18b, and the outer cylinder part 18a and the inner cylinder part 18b are joined together. An oil reservoir 36 is provided in the flange, which is filled with lubricant and closed with a plug 37. In addition to supplying lubricant to the oil groove 38 provided on the inner peripheral surface of the bushing 24, An oil groove 39 is also provided in the flange of the attached bush 24 to improve lubrication. Also, the inner cylinder part An annular groove 40 is provided on the inner circumferential surface of the bushing 18b at a position outside the flanged bushing 24. An elastic seal such as an O-ring 41 is attached to the annular groove 40 to prevent foreign matter from entering. . The annular groove 40 may be provided on the inner peripheral surface of the flanged bush 24 near the outer end thereof.

[0016] Thus, the top boss 4, the swing bosses 17, 17, and the fixed bosses 18, 18 are Insert the pin 19, attach the end caps 42 to both end surfaces of the pin 19, and then tighten the bolt 4. 3 to prevent the pin 19 from coming out from each boss. Outer end surface of fixed boss 18 A self-lubricating shim 44 can be interposed between the end cap 42 and the end cap 42. There is. Then, it is possible to absorb assembly errors of the flanged bushes 23 and 24 during assembly, or Or, during use, play may occur between the flanged bushes 23 and 24, causing the end seals 35 and 35 If a gap occurs between the holes, a shim 44 of an appropriate thickness can be inserted into the gap and When the door cap 42 is tightened, the fixed boss 18 moves along the axial direction of the pin 19 to the swinging bolt. The flanged bush 24 also moves along the pin 19 toward the flanged bush 23 side. , the flanges come into contact with each other and the end seals 35, 35 are in close contact again, and the gap between the seals is The gap is eliminated.

[0017] FIG. 5 shows approximately the left half of the other end side of the arm link 7, and shows left and right sides with respect to the center line L. It is formed into a name. Swing boss 20 of arm 1 and fixed boss 2 of arm link 7 Flange bushes 45 and 46 are provided at the joint portion of 1 so that the respective flanges face each other, An oil reservoir 47 is provided in the center of the swing boss 20 and filled with lubricant such as grease. It is closed at 48. The lubricant filled in the oil reservoir 47 flows into the oil groove 4 of the flanged bush 45. 9, and oil grooves 50 and 51 are also provided on the inner peripheral surface and the flange of the flanged bush 46. This ensures good lubrication of each sliding surface.

[0018] Annular grooves 52, 5 are formed on the contact surfaces of the flanges of the flanged bushing 45 and the flanged bushing 46. 2 are bored facing each other, and the annular grooves 52, 52 are formed with a composite of an elastic body and a metal body. The end face seals 53, 53 are inserted, and the respective seals 53, 53 are brought into contact with each other facing each other. let Further, a stepped portion 54 is provided on the outer peripheral edge of the flanged bush 45, and the O-ring 5 is inserted here. Insert an elastic seal such as No. To prevent objects from entering and leaking of internal lubricant. In addition, the inner circumference of the flanged bush 46 An annular groove 56 is bored near the outer end of the surface, and an elastic seal such as an O-ring 57 is attached here as well. Fits in and seals the lubricated area.

[0019] Then, insert the pin 22 into the swing boss 20 and the fixed bosses 21, 21, and Attach end caps 58 to both end surfaces of 22 and insert bolts 59, Insert the bolt 60 also into the outer end surface of the fixed boss 21 and tighten the end cap 58. . A self-lubricating material is provided between the outer end surface of the flanged bush 46 and the end cap 58. A shim 61 having a shim 61 can be inserted and is driven into the end cap 58 side. The parallel pin 62 is connected to the outer end surface of the flanged bushing 46 by loosely fitting it, and the flanged bushing This prevents the rotation of the screw 46. The shim 61 has an opening at the position of this parallel pin 62. A hole has been drilled. And the joint part of the flanged bushes 45 and 46 during assembly. To absorb errors or if play occurs in both joints during use, use the end cap described above. By increasing or decreasing the thickness of the shim 44 as appropriate in the gap between the flanged bush 4 and the bush 58, 6 in the axial direction of the pin 22 to adjust. At that time, the inside of the fixed boss 21 The gap 63 between the end face and the flange of the flanged bushing 46 is used to crush the end face seal 53. It has become an escape fee.

[0020] This invention may be modified in various ways as long as it does not depart from the spirit of this invention. Naturally, this invention extends to the modified version.

[0021]

[Effect of the idea]

As described in detail in the above embodiment, this idea Bushes with flanges are provided, and seals are fitted into the annular grooves of the opposing flanges. The seals are in close contact with each other to prevent foreign matter from entering from the outside, and also to prevent internal lubricant from entering. It can also prevent leakage. Also, the outer end of the end cap and fixed boss or flanged bush. A shim is interposed between the The gap between the flanged bushes on both sides and the tightness of the seals can be adjusted, allowing for easy adjustment during assembly. In addition to preventing deterioration of sealing and rattling noise caused by rattling during use, Abnormal wear and biting can be prevented and the life of the pin connection portion can be improved.

[Brief explanation of drawings]

FIG. 1 is a side view showing a hydraulic excavator section of a construction machine.

FIG. 2 is a vertical cross-sectional view of a main part of a bearing device of a pin connection part in a conventional construction machine.

3 is a sectional view taken along the line A-A in FIG. 1 showing a bearing device for a pin connection portion according to an embodiment of the present invention.

FIG. 4 is a longitudinal cross-sectional view of the main part showing approximately the left half of one end of the arm link.

FIG. 5 is a vertical cross-sectional view of the main part showing approximately the left half of the other end of the arm link.

[Explanation of symbols]

17,20 Swing boss 18, 21 Fixed boss 19,22 pin 23, 24, 45, 46 Flange bushing 28, 41, 55, 57 O-ring 29, 36, 47 Oil puddle 34,52 Annular groove 35,53 End seal 42,58 End cap 44,61 shim

Claims (1)

[Scope of utility model registration request] Claim 1: To connect the rotating member to the fixed member,
A pin connection structure in which a swinging boss is fixed to one member, a fixed boss is fixed to the other member, the swinging boss is sandwiched, a pin is inserted through both bosses, and the pin is supported by the fixed boss. A flanged bush is provided at the joint portion of both of the bosses, an annular groove is formed facing each other in the abutting surface of each flanged bush, and a seal is fitted into the annular groove, and the flanged bush is attached to the flanged bush. An elastic seal is inserted into the outer peripheral edge of the joint part of the bushing, oil reservoirs are provided in both bosses to lubricate the sliding surface between the boss and the pin, and an inner seal near the outer end of the fixed boss is fitted. In addition to fitting a seal to the peripheral surface, end caps are bolted to both end surfaces of the pin, and a shim is interposed between the end cap and the outer end surface of the fixed boss or flanged bush to secure the fixed boss side. A bearing device for a pin connection part of a construction machine, characterized in that a flanged bush is formed to be movable in the axial direction.