A sealing structure for a bulldozer axle end

Abstract

The utility model relates to oil seal sealing technical field, concretely relates to a sealing structure for bulldozer axle end. The oil seal sealing structure sets up O type ring between the end face of oil seal seat and guide wheel seat, avoids the leakage of working oil from the installation gap between oil seal seat and guide wheel seat, improves the sealing effect, installs dustproof shell between oil seal seat and output flange again, surrounds oil seal in oil seal seat, output flange through dustproof shell, blocks the mud, dust etc. and enters the oil seal, protects the oil seal lip, avoids the lip abrasion, thereby influences the sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of oil seal technology, specifically to a sealing structure for the end of a bulldozer shaft. Background Technology

[0002] A bulldozer is an earthmoving machine capable of excavating, transporting, and dumping soil and rock. It has a wide range of applications in open-pit mines, such as constructing spoil heaps, leveling truck spoil heaps, stockpiling loose ore and rock, leveling work platforms, and building sites. The bulldozer's movement is achieved by a torque converter connected to a power take-off device to transmit power.

[0003] Traditional bulldozer torque converter output shaft seals are single oil seals, directly mounted on the output flange. One end of the output flange connects to a universal joint, and the other end connects to the output shaft via a spline. Poor coaxiality of the universal joint and spline clearance mismatches mean that the coaxiality of the output flange with the oil seal cannot be guaranteed, potentially damaging the oil seal lip. This structure is prone to oil leakage. Recent technologies address the coaxiality issue caused by the spline fit on the flange's outer diameter by adding a bushing to the output shaft. However, this relies on two O-rings to seal the oil seal separately. Radial seals are applied between the oil seal seat and the housing, as well as between the bushing and the output shaft. During bulldozing operation, the output shaft of the torque converter vibrates. As the vibration continues, one end of the connection between the oil seal seat and the housing loosens slightly, creating a gap that causes oil to leak from the gap. Furthermore, the bulldozing environment is often accompanied by mud, dust, sand, and other debris. If no physical dustproof components are installed, debris may enter the seal through the fit gap between the bushing and the flange and the bearing, contaminating the transmission oil and aggravating the wear of moving parts such as the bearing and the output shaft. Utility Model Content

[0004] Based on the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a sealing structure for the end of a bulldozer shaft.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: This utility model discloses a sealing structure for the shaft end of a bulldozer, including an output shaft, an oil seal seat, a bearing, an output flange, and a guide wheel seat mounted on the output shaft. The bearing is interference-fitted with the output shaft, the guide wheel seat is mounted on the output shaft through the bearing, the oil seal seat is disposed on the guide wheel seat, the end faces of the oil seal seat and the guide wheel seat are in contact, an O-ring is disposed between the end faces of the oil seal seat and the guide wheel seat, a dustproof shell is disposed between the oil seal seat and the output flange, and the output flange is connected to the output shaft by threads.

[0006] Preferably, a positioning sleeve is also installed on the output shaft, and the positioning sleeve is disposed between the bearing and the output flange.

[0007] Preferably, the oil seal seat is disposed above the positioning sleeve, the positioning sleeve has a slot, and the oil seal seat has a stepped groove milled out.

[0008] Preferably, the sealing structure further includes an oil seal, which is installed on the oil seal seat and positioned above the positioning sleeve. The positioning sleeve has a slot, and the oil seal seat has a stepped groove milled out. One end of the oil seal is installed in the stepped groove, and the other end is engaged in the slot.

[0009] Preferably, the oil seal seat and the guide wheel seat are connected by bolts.

[0010] Preferably, the oil seal seat has a groove, and the O-ring is installed in the groove.

[0011] Preferably, the O-ring is a rubber sealing ring.

[0012] Preferably, the dustproof shell includes a first dustproof component, a second dustproof component, and a third dustproof component, wherein the first dustproof component includes a first connecting portion and a second connecting portion.

[0013] Preferably, the two ends of the second dustproof component are respectively connected to the first dustproof component and the third dustproof component, the first dustproof component abuts against the output flange, and the second dustproof component is connected to the oil seal seat.

[0014] Preferably, the output flange is provided with a first fitting part and a second fitting part, the oil seal seat is provided with a third fitting part, the first connecting part is fitted and connected to the first fitting part, the second connecting part is fitted and connected to the second fitting part, and the third dustproof component is fitted and connected to the third fitting part.

[0015] Preferably, the lip of the oil seal is interference-fitted with the positioning sleeve.

[0016] The beneficial effects of this utility model are as follows: This utility model provides a sealing structure for the shaft end of a bulldozer. This sealing structure improves the sealing effect by setting an O-ring between the end faces of the oil seal seat and the guide wheel seat to prevent working oil from leaking through the installation gap between the oil seal seat and the guide wheel seat; furthermore, by installing a dust cover between the oil seal seat and the output flange, the dust cover surrounds the oil seal within the oil seal seat and the output flange, preventing mud, water, dust, etc., from entering the oil seal, thus protecting the oil seal lip and preventing lip wear, which would affect the sealing effect. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a front view cross-sectional structural diagram of the sealing structure of this utility model.

[0019] Figure 2 This is a partially enlarged schematic diagram of the sealing structure of this utility model. The component names and their numbers in the diagram are as follows: 100, sealing structure; 1, output shaft; 2, oil seal seat; 3, bearing; 4, output flange; 5, guide wheel seat; 6, positioning sleeve; 7, O-ring; 8, oil seal; 9, bolt; 10, dustproof shell; 21, transverse connecting piece; 22, vertical connecting piece; 211, stepped groove; 221, groove; 222, screw hole; 61, slot; 11, first dustproof component; 12, second dustproof component; 13, third dustproof component; 111, first connecting part; 112, second connecting part; 41, first fitting part; 42, second fitting part; 23, third fitting part. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] like Figure 1-2 As shown, this embodiment provides a sealing structure 100 for the shaft end of a bulldozer, including an output shaft 1 of a torque converter, an oil seal seat 2 mounted on the output shaft 1, a bearing 3, an output flange 4, a guide wheel seat 5, and a positioning sleeve 6. The guide wheel seat 5 is located at one end of the output shaft 1 and is connected to the output shaft 1 via the bearing 3. The inner ring of the bearing 3 is interference-fitted with the output shaft 1 to provide radial support for the output shaft 1, and the outer ring of the bearing 3 is fitted with the guide wheel seat 5 to provide stable rotational support for the output shaft 1. The other end of the output shaft 1 is fitted with a splined bearing. The output flange 4 and the bearing 3 are located between the guide wheel seat 5 and the output flange 4. The bearing 3 is positioned close to the guide wheel seat 5, and the other end of the bearing 3 away from the guide wheel seat 5 is equipped with a positioning sleeve 6. The positioning sleeve 6 is positioned between the bearing 3 and the output flange 4, and the top of the positioning sleeve 6 has a groove 61. The guide wheel seat 5 surrounds the bearing 3 and the positioning sleeve 6 between the guide wheel seat 5 and the output shaft 1. The oil seal seat 2 is installed on the guide wheel seat 5. The guide wheel seat 5 is an oil inlet component installed at the front end of the torque converter. Its main function is to guide the working oil of the torque converter into the interior of the guide wheel assembly to generate a torque conversion effect.

[0022] In this embodiment, as Figure 1-2As shown, the oil seal seat 2 is positioned above the positioning sleeve 6. The oil seal seat 2 is T-shaped and includes a horizontal connecting member 21 and a vertical connecting member 22. The inner surfaces of the horizontal connecting member 21 and the vertical connecting member 22 mate with the guide wheel seat 5. One end of the horizontal connecting member 21 has a stepped groove 211 milled out. The vertical connecting member 22 has a groove 221 on one side that mates with the guide wheel seat 5, and a screw hole 222 on the other side. The oil seal seat 2 and the guide wheel seat 5 are fixed by bolts 9, which pass through the screw hole 222. 22. The oil seal seat 2 is fixed on the guide wheel seat 5. An O-ring 7 is installed between the oil seal seat 2 and the guide wheel seat 5. The O-ring 7 is a rubber ring. The O-ring 7 is installed in the groove 221 and contacts the end face of the guide wheel seat 5. When the oil seal seat 2 is installed on the bulldozer shaft end, the end face of the oil seal seat 2 presses against the guide wheel seat 5. The O-ring 7 is deformed by the compression, and the end faces of the oil seal seat 2 and the guide wheel seat 5 are pressed and sealed to prevent the working oil from leaking from the installation gap between the oil seal seat 2 and the guide wheel seat 5, thereby improving the sealing effect.

[0023] In this embodiment, as Figure 1 As shown, the sealing structure 100 also includes an oil seal 8. The oil seal 8 is installed on the oil seal seat 2. One end of the oil seal 8 is installed on the stepped groove 211 of the oil seal seat 2, and the other end is engaged in the slot 61 of the positioning sleeve 6. The oil seal 8 is held in the middle by the oil seal seat 2 and the positioning sleeve 6, which prevents the oil seal 8 from being directly installed on the output shaft 1, ensures the coaxiality of the oil seal 8 assembly, and avoids wear of the oil seal lip caused by the difference in coaxiality, which would lead to oil leakage of the oil seal 8.

[0024] In this embodiment, as Figure 2 As shown, a dustproof housing 10 is provided between the oil seal seat 2 and the output flange 4. The dustproof housing 10 includes a first dustproof component 11, a second dustproof component 12, and a third dustproof component 13. The first dustproof component 11 includes a first connecting portion 111 and a second connecting portion 112. The two ends of the second dustproof component 12 are respectively connected to the first dustproof component 11 and the second dustproof component 13. The first dustproof component 11 abuts against the output flange 4, and the first connecting portion 111 is fitted and connected to the first fitting portion 41 of the output flange 4 near the positioning sleeve 6. The second connecting part 112 is fitted and connected to the second fitting part 42 on the output flange 4, which is perpendicular to the first fitting part 41. The third dustproof part 13 is connected to the oil seal seat 2. The third dustproof part 13 is fitted and connected to the third fitting part on the oil seal seat 2. In this embodiment, the oil seal 8 is surrounded by the oil seal seat 2 and the output flange 4 by the dustproof shell 10. The dustproof shell 10 can be used to prevent mud, water, dust and other substances from entering the oil seal 8, so as to protect the lip of the oil seal 8 and avoid wear of the lip, thereby affecting the sealing effect.

[0025] In this embodiment, the torque converter is a hydraulic transmission component with a constant internal circulation of working oil for torque transmission, cooling, lubrication, etc. The working oil of the torque converter flows into the bearing 3 from the oil guide channel inside the guide wheel seat 5, providing lubrication to the bearing 3 and reducing friction and wear when the output shaft rotates. The working oil then flows naturally into the oil seal 8 along the tiny gap between the inner ring of the bearing 3 and the output shaft 1. The oil seal 8 has a lip seal structure, and the pressure of the working oil will make the lip of the oil seal 8 fit tightly against the positioning sleeve 6, enhancing the tightness of the seal and preventing the working oil inside the oil seal 8 from leaking. In addition, the working oil will also flow into the mating gap between the dust cover 10 and the output flange 4 and the positioning sleeve 6, using the pressure of the oil to fill the gap and form a pressure sealing cavity, which not only prevents external impurities from entering, but also further enhances the sealing effect of the oil and avoids leakage.

[0026] This embodiment provides a sealing structure for the end of a bulldozer shaft. This sealing structure improves the sealing effect by placing an O-ring 7 between the end faces of the oil seal seat 2 and the guide wheel seat 5 to prevent working oil from leaking through the installation gap between the oil seal seat 2 and the guide wheel seat 5. Furthermore, by installing a dust cover 10 between the oil seal seat 2 and the output flange 4, the dust cover 10 surrounds the oil seal 8 within the oil seal seat 2 and the output flange 4, preventing mud, water, dust, etc., from entering the oil seal 8, thus protecting the lip of the oil seal 8 and preventing lip wear, which would affect the sealing effect.

[0027] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing structure for the end of a bulldozer shaft, characterized in that, The device includes an output shaft, an oil seal seat, a bearing, an output flange, and a guide wheel seat mounted on the output shaft. The bearing is interference-fitted with the output shaft. The guide wheel seat is mounted on the output shaft via the bearing. The oil seal seat is disposed on the guide wheel seat, and the end faces of the oil seal seat and the guide wheel seat are in contact. An O-ring is provided between the end faces of the oil seal seat and the guide wheel seat. A dustproof shell is provided between the oil seal seat and the output flange. The output flange is connected to the output shaft via threads.

2. The sealing structure for the bulldozer shaft end according to claim 1, characterized in that, A positioning sleeve is also installed on the output shaft, and the positioning sleeve is disposed between the bearing and the output flange.

3. The sealing structure for the bulldozer shaft end according to claim 2, characterized in that, The sealing structure also includes an oil seal, which is installed on the oil seal seat. The oil seal seat is located above the positioning sleeve. The positioning sleeve has a slot, and the oil seal seat has a stepped groove milled out. One end of the oil seal is installed in the stepped groove, and the other end is engaged in the slot.

4. The sealing structure for the bulldozer shaft end according to claim 3, characterized in that, The oil seal seat and the guide wheel seat are connected by bolts.

5. The sealing structure for the bulldozer shaft end according to claim 4, characterized in that, The oil seal seat has a groove, and the O-ring is installed in the groove.

6. The sealing structure for the bulldozer shaft end according to claim 5, characterized in that, The O-ring is a rubber sealing ring.

7. The sealing structure for the bulldozer shaft end according to claim 1, characterized in that, The dustproof housing includes a first dustproof component, a second dustproof component, and a third dustproof component. The first dustproof component includes a first connecting portion and a second connecting portion.

8. The sealing structure for the bulldozer shaft end according to claim 7, characterized in that, The two ends of the second dustproof component are respectively connected to the first dustproof component and the third dustproof component. The first dustproof component abuts against the output flange, and the second dustproof component is connected to the oil seal seat.

9. The sealing structure for the bulldozer shaft end according to claim 8, characterized in that, The output flange is provided with a first fitting part and a second fitting part, the oil seal seat is provided with a third fitting part, the first connecting part is fitted and connected to the first fitting part, the second connecting part is fitted and connected to the second fitting part, and the third dustproof component is fitted and connected to the third fitting part.

10. The sealing structure for the bulldozer shaft end according to claim 4, characterized in that, The lip of the oil seal is interference-fitted with the positioning sleeve.

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