Double-pin-bush sealing system lubricating track and assembling method thereof

Abstract

The invention discloses a double-pin-bush sealing system lubrication crawler belt and an assembling method thereof in the technical field of bulldozer chassis systems, and aims to solve the technical problems of abrasion of pin bushes and short service life of the crawler belt. The lubricating track comprises a driving wheel, a track link, a pin shaft, an inner pin sleeve, a lining and a track shoe, the track shoe is fixed to the track link, the track link is connected with the pin shaft in an interference fit mode, the pin shaft is in clearance fit with the inner pin sleeve, the inner pin sleeve is further sleeved with an outer pin sleeve, the outer pin sleeve rotates around the inner pin sleeve, and the lining is arranged on the outer pin sleeve. And one end of the lining is in close contact with the outer pin sleeve, and the other end of the lining is in interference fit with a track link section through a sealing assembly, so that a sealing system is formed. The performance of the crawler belt can be improved, the service life of the crawler belt can be prolonged, meanwhile, the maintenance cost is reduced, and the overall working efficiency of engineering mechanical equipment is improved.

Description

Technical Field

[0001] The invention relates to a double-pin sleeve sealing system lubricating crawler and an assembly method thereof, belonging to the technical field of bulldozer chassis systems. Background Art

[0002] Bulldozers mainly rely on the chassis system to complete the walking action. Since the walking rate of crawler bulldozers is relatively high, higher requirements are placed on the reliability of the crawler assembly. At present, crawler bulldozers mostly use combined lubricated crawlers, which are composed of track plates, chain track segments, pin shafts, pin sleeves, sealing components, and bolts and nuts. The lubricating medium is lubricating oil. The drive wheel transmits power through the meshing of the teeth and the pin sleeves for the main machine to move. Since the drive wheel gear block will continuously wear the outer circle of the pin sleeve during the movement of the bulldozer, the coordination between the drive wheel and the track pin sleeve is very important. Conventional lubricated crawlers mostly use a single shaft sleeve plus a sealing component. During the operation of the crawler, the outer periphery of the pin sleeve meshes with the drive wheel, and the inner periphery of the pin sleeve cooperates with the pin shaft. The working environment of the pin sleeve is relatively harsh, which is very easy to cause serious wear, resulting in a significant reduction in the service life of the crawler assembly. Summary of the invention

[0003] The purpose of the present invention is to provide a double pin sleeve sealing system lubricating crawler and an assembly method thereof, which can reduce the wear of the pin sleeve and extend the service life of the crawler.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0005] In the first aspect, the present invention provides a double pin sleeve sealing system for lubricating a crawler track, comprising a driving wheel, a track link, a pin shaft, an inner pin sleeve, a bushing, and a track plate, wherein the track plate is fixed on the track link, the track link and the pin shaft are connected by an interference fit, a clearance fit is adopted between the pin shaft and the inner pin sleeve, an outer pin sleeve is also sleeved on the inner pin sleeve, the outer pin sleeve rotates around the inner pin sleeve and meshes with the driving wheel, one end of the bushing is in close contact with the outer pin sleeve, and the other end is in interference fit with the track link through a sealing assembly to form a sealing system.

[0006] In combination with the first aspect, further, a gap is left between the bushing and the inner pin sleeve.

[0007] In combination with the first aspect, further, an oil leakage hole is provided on the pin shaft, and the lubricating oil enters the gap between the pin shaft and the inner pin sleeve through the oil leakage hole, and then flows into the oil storage chamber connected to the outer pin sleeve through the gap between the bushing and the inner pin sleeve.

[0008] In combination with the first aspect, further, the chain track link is provided with an axial end countersunk hole, and the other end of the bushing is installed on the axial end countersunk hole through a sealing assembly.

[0009] In combination with the first aspect, further, the chain track link is provided with a sleeve end countersunk hole, and the sealing assembly is installed on the sleeve end countersunk hole.

[0010] In combination with the first aspect, further, the track plate is provided with a second bolt hole, and the chain track segment is also provided with a first bolt hole, the first bolt hole is aligned with the second bolt hole, and a bolt passes through the first bolt hole and the second bolt hole, so that the track plate is fixedly connected to the chain track segment.

[0011] In a second aspect, a method for assembling a double pin sleeve sealing system lubricating track comprises: Installing the inner pin sleeve on the pin shaft to form a clearance fit; The outer pin sleeve is sleeved on the inner pin sleeve so that the outer pin sleeve can rotate around the inner pin sleeve; Installing the sealing assembly on the sleeve end countersunk hole of the chain track segment; Placing the pin shaft, inner pin sleeve and outer pin sleeve together with the chain track segment on a press-fitting machine for press-fitting operation, so as to press-fit and fix the pin shaft and double pin sleeve assembly on the chain track segment; After the press-fitting is completed, the chain track section is inspected to ensure that the chain track section can rotate normally; Placing the track shoe at a preset position, aligning the second bolt hole on the track shoe with the first bolt hole on the track link, and passing a bolt through the first bolt hole and the second bolt hole; After manually tightening the bolts for at least two turns, use the pre-prepared pneumatic impact wrench and nut to further pre-tighten the manually tightened bolts; Use a pre-prepared preset torque wrench to perform final tightening on the bolts to achieve the preset torque value.

[0012] In combination with the second aspect, further, the torque value ranges from 2700 to 2900 KN.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The lubricating crawler described in the present invention enhances the structural stability and flexibility of the crawler through the interference fit between the chain track segment and the pin shaft and the clearance fit between the pin shaft and the inner pin sleeve, so that the crawler exhibits higher reliability and durability when subjected to high loads and harsh working conditions. Secondly, the outer pin sleeve can rotate around the inner pin sleeve and mesh with the drive wheel. This rotation mechanism effectively disperses the wear of the pin sleeve, prolongs the service life of the pin sleeve, and also reduces the crawler failure rate caused by wear. Furthermore, the close contact between the bushing and the outer pin sleeve and the interference fit with the chain track segment through the sealing component form an efficient sealing system, which not only improves the lubrication effect and reduces the leakage of lubricating oil, but also prevents the intrusion of external pollutants, thereby reducing the maintenance cost and prolonging the maintenance cycle of the crawler.

[0014] In addition, the lubricated crawler track of the present invention also allows only the bushing to be replaced when the bushing is worn, without replacing the entire pin sleeve, further reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic structural diagram of a lubricating belt of a double-pin sleeve sealing system provided by an embodiment of the present invention; Figure 2 Shown is an assembly diagram of a lubricating belt of a double pin sleeve sealing system provided by an embodiment of the present invention; Figure 3 Shown is a hole opening diagram of a track link provided by an embodiment of the present invention; Figure 4 Shown is a hole opening diagram of a track shoe provided by an embodiment of the present invention; In the figure: 1. track link; 2. pin shaft; 3. inner pin sleeve; 4. outer pin sleeve; 5. sealing assembly; 6. bushing; 7. track shoe; 8. bolt; 9. nut; 10. first bolt hole; 11. sleeve end countersunk hole; 12. shaft end countersunk hole; 13. second bolt hole; 14. oil leakage hole; 15. oil storage chamber. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0017] The term "and / or" is only a description of the association relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the related objects are in an "or" relationship. Example 1

[0018] See also Figure 1 The present invention introduces a double pin sleeve sealing system lubricating belt, which is intended to improve the reliability and service life of the crawler assembly of crawler-type engineering machinery such as bulldozers. The lubricating crawler includes a driving wheel (not shown in the figure), a track link 1, a pin shaft 2, an inner pin sleeve 3, a bushing 6, and a track shoe 7. The track shoe 7 is fixed to the track link 1 by bolts 8 to ensure structural stability. The track link 1 is connected to the pin shaft 2 by an interference fit, while the inner pin sleeve 3 and the pin shaft 2 are clearance fit to allow the flow of lubricating oil.

[0019] The inner pin sleeve 3 is sleeved with an outer pin sleeve 4, which can rotate around the inner pin sleeve 3 and mesh with the teeth of the driving wheel to reduce wear and improve power transmission efficiency. One end of the bushing 6 is in close contact with the outer pin sleeve 4, and the other end is interference fit with the chain track link 1 through the sealing component 5 to form a sealing system, which effectively prevents lubricating oil leakage and external pollution.

[0020] In another embodiment of the present invention, a certain gap is also left between the bushing 6 and the inner pin sleeve 3, so as to facilitate the flow and distribution of lubricating oil. The pin shaft 2 is specially designed with an oil leakage hole 14, through which the lubricating oil enters the gap between the pin shaft 2 and the inner pin sleeve 3, and then flows into the oil storage chamber 15 connected to the outer pin sleeve 4 through the gap between the bushing 6 and the inner pin sleeve 3, so as to ensure the effective operation of the lubrication system.

[0021] See also Figure 3 The chain track link 1 is provided with a shaft end countersunk hole 12, and the other end of the bushing 6 is installed on the shaft end countersunk hole 12 through the sealing assembly 5, thereby enhancing the sealing effect.

[0022] In addition, a sleeve end countersunk hole 11 is provided on the chain track link 1, and the sealing assembly 5 is installed on the sleeve end countersunk hole 11 to further ensure the sealing performance.

[0023] See 2 to Figure 4 A second bolt hole 13 is provided on the track shoe 7, and a first bolt hole 10 is provided on the track link 1. The first bolt hole 10 is aligned with the second bolt hole 13. The bolt 8 passes through the two bolt holes to achieve a fixed connection between the track shoe 7 and the track link 1, thereby improving the stability and durability of the track, and significantly extending the service life of the track by reducing wear and improving lubrication efficiency.

[0024] In summary, the design of the double pin sleeve sealing system lubricating track effectively increases the oil storage capacity by adding an outer pin sleeve and a bushing 6, thereby extending the lubrication time and reducing internal wear. The embodiment of the present invention helps to reduce the wear problem of the pin sleeve end due to long-term use. When the pin sleeve end is worn, only the bushing 6 needs to be replaced without replacing the entire pin sleeve system. This maintenance method significantly reduces the maintenance cost. Therefore, the overall service life of the double pin sleeve sealing system lubricating track can be nearly doubled compared to the traditional design, which not only improves the working efficiency of the machine, but also reduces the maintenance cost in long-term operation. Example 2

[0025] See also Figures 1 to 4 , a method for assembling the lubricating belt of the double pin sleeve sealing system as described in Example 1, comprising the following steps: Step S1, install the inner pin sleeve 3 on the pin shaft 2 and form a clearance fit to ensure that there is enough space between the pin shaft and the inner pin sleeve to store lubricating oil.

[0026] Step S2, sleeve the outer pin sleeve 4 on the inner pin sleeve 3, so that the outer pin sleeve 4 can rotate around the inner pin sleeve 3, which helps to evenly distribute the wear and extend the service life of the pin sleeve.

[0027] Step S3: Install the sealing assembly 5 on the sleeve end countersunk hole 11 of the track link 1 to ensure good sealing of the lubrication system.

[0028] Step S4, on a press machine, place the pin shaft 2, the inner pin sleeve 3 and the outer pin sleeve 4 together with the chain track segment 1 for press-fitting operation, press-fit the pin shaft 2 and the double pin sleeve assembly onto the chain track segment 1 to ensure a tight fit between the components.

[0029] Step S5: After the press-fitting is completed, the track link 1 is tested to ensure that it can rotate normally, thereby verifying the effect of the press-fitting operation and ensuring the flexibility and functionality of the crawler track.

[0030] Step S6, placing the track shoe 7 at a preset position, aligning the second bolt hole 13 on the track shoe 7 with the first bolt hole 10 on the track link 1, and passing the bolt 8 through the first bolt hole 10 and the second bolt hole 13 to achieve a fixed connection between the track shoe and the track link 1.

[0031] Step S7, after manually tightening the bolt 8 for at least two turns, use a pneumatic impact wrench and a nut 9 to further pre-tighten the bolt 8 to ensure the initial fixation between the components.

[0032] Step S8: final tightening the bolt (8) using a preset torque wrench to reach a preset torque value. This step ensures a firm connection between the track shoe and the track link to prevent loosening due to vibration or impact during operation.

[0033] Furthermore, the torque value ranges from 2700 to 2900 KN.

[0034] In summary, the assembly method of the lubricating belt of the double-pin sleeve sealing system of the embodiment of the present invention not only improves the sealing and lubrication effect of the track, but also significantly extends the service life of the track and reduces maintenance costs by reducing wear and improving the stability of the components.

[0035] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A double pin sleeve sealing system lubricating crawler track, characterized in that: The invention comprises a driving wheel, a track link (1), a pin shaft (2), an inner pin sleeve (3), a bushing (6), and a track shoe (7). The track shoe (7) is fixed on the track link (1). The track link (1) is connected to the pin shaft (2) by interference fit. The pin shaft (2) and the inner pin sleeve (3) are clearance fit. An outer pin sleeve (4) is sleeved on the inner pin sleeve (3). The outer pin sleeve (4) rotates around the inner pin sleeve (3) and meshes with the driving wheel. One end of the bushing (6) is in close contact with the outer pin sleeve (4), and the other end is interference fit with the track link (1) through a sealing component (5) to form a sealing system.

2. The double pin sleeve sealing system lubricating track according to claim 1, characterized in that: A gap is left between the bushing (6) and the inner pin sleeve (3).

3. The double pin sleeve sealing system lubricating track according to any one of claim 2, characterized in that: The pin shaft (2) is provided with an oil leakage hole (14), and the lubricating oil enters the gap between the pin shaft (2) and the inner pin sleeve (3) through the oil leakage hole (14), and then flows into the oil storage chamber (15) connected to the outer pin sleeve (4) through the gap between the bushing (6) and the inner pin sleeve (3).

4. The double pin bushing sealing system lubricating track according to claim 1, characterized in that: The chain track link (1) is provided with a shaft end countersunk hole (12), and the other end of the bushing (6) is mounted on the shaft end countersunk hole (12) via a sealing assembly (5).

5. The double pin sleeve sealing system lubricating track according to claim 4, characterized in that: The chain track link (1) is also provided with a sleeve end countersunk hole (11), and the sealing assembly (5) is mounted on the sleeve end countersunk hole (11).

6. The double pin bushing sealing system lubricating track according to claim 1, characterized in that: The track shoe (7) is provided with a second bolt hole (13), and the track link (1) is further provided with a first bolt hole (10), the first bolt hole (10) is aligned with the second bolt hole (13), and a bolt (8) passes through the first bolt hole (10) and the second bolt hole (13), so that the track shoe (7) and the track link (1) are fixedly connected.

7. An assembly method for a double pin sleeve sealing system lubricating track according to any one of claims 1 to 6, characterized in that: include: Installing the inner pin sleeve (3) on the pin shaft (2) to form a clearance fit; The outer pin sleeve (4) is sleeved on the inner pin sleeve (3) so that the outer pin sleeve (4) can rotate around the inner pin sleeve (3); Installing the sealing assembly (5) on the sleeve end countersunk hole (11) of the chain track link (1); Placing the pin shaft (2), the inner pin sleeve (3) and the outer pin sleeve (4) together with the chain track segment (1) on a press-fitting machine for a press-fitting operation, so as to press-fit the pin shaft (2) and the double pin sleeve assembly onto the chain track segment (1); After the press-fitting is completed, the chain track segment (1) is tested to ensure that the chain track segment (1) can rotate normally; Placing the track shoe (7) at a preset position, aligning the second bolt hole (13) on the track shoe (7) with the first bolt hole (10) on the track link (1), and passing a bolt (8) through the first bolt hole (10) and the second bolt hole (13); After manually tightening the bolt (8) for at least two turns, a pre-prepared pneumatic impact wrench and nut (9) are used to further pre-tighten the manually tightened bolt (8); The bolt (8) is then tightened to a preset torque value using a pre-prepared preset torque wrench.

8. The assembly method of the double pin sleeve sealing system lubricating track according to claim 7, characterized in that: The torque value ranges from 2700 to 2900 KN.

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