Power takeoff capable of preventing air leakage and oil leakage

Abstract

The utility model provides a gas and oil leakage prevention power takeoff which is used for solving the technical problems that a gap exists between an input shaft of an existing power takeoff and a power takeoff shell, and lubricating oil has the flowing risk. A sealing structure is arranged on the side edge of a power takeoff shell and comprises a first step, a second step, a shaft hole and a third step which are sequentially arranged from outside to inside, and the first step, the second step and the third step are all annular steps and are coaxial with the shaft hole; the input shaft is mounted in the shaft hole and is in clearance fit with the power takeoff shell; the bearing is pressed and fixed in the first step, the check ring on the input shaft is located in the second step, and the oil seal is pressed and fixed in the third step. According to the power takeoff, the risk that gas and lubricating oil flow inside and outside the power takeoff shell can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to a power take-off, in particular to a power take-off which is resistant to air and oil leakage. Background Art

[0002] The gearbox is an important component in the automobile structure. The power take-off is connected to the output shaft of the gearbox to output the power of the gearbox to the outside for work. According to different installation positions, the power take-off is divided into front power take-off, rear power take-off, and side power take-off. The front power take-off is installed between the gearbox and the clutch to take power from the engine. Due to the limitations of the structure and installation position of the front power take-off, when the vehicle is going up and down the slope, it is easy for the lubricating oil to be concentrated on one end of the power take-off or the gearbox, resulting in a lack of lubrication at the other end, affecting the normal operation of the gearbox and the power take-off. In order to ensure the lubrication effect of the gears and ensure the normal operation of the vehicle, it is necessary to separate the front power take-off from the gearbox, lubricate each, and refuel separately. Therefore, there should be an independent sealed space between the front power take-off and the gearbox to ensure that the lubricating oil in the two boxes of the power take-off and the gearbox cannot flow back and forth. The power take-off in the prior art is easy to move back and forth in the gearbox, indicating that the two boxes are not completely independent and closed structures, so there is a risk of lubricating oil flowing, which is easy to cause problems such as oil leakage and air leakage.

[0003] Chinese patent CN202309321U relates to a motor shaft extension end sealing protection structure, which includes a bearing inner cover and a bearing outer cover arranged on both sides of the motor shaft extension end, a bearing, an oil slinger and a shaft elastic retaining ring are arranged between the bearing inner cover and the bearing outer cover, a cover plate is arranged on the outer side of the bearing outer cover, a V-shaped oil seal ring is arranged on the cover plate, and a skeleton oil seal ring is arranged on the bearing outer cover to form a double-layer sealing protection structure. This patent can better prevent water leakage between the gaps of fastener installation, but its structure is relatively complex and cannot be applied to the power take-off housing to solve the problem of oil and gas leakage. Utility Model Content

[0004] The utility model aims to solve the technical problem that there is a gap between the input shaft and the housing of the existing power take-off and there is a risk of lubricating oil flow, and proposes a power take-off that prevents air and oil leakage.

[0005] In order to solve the above technical problems, the technical solutions provided by the utility model are as follows:

[0006] A power take-off device that prevents gas and oil leakage comprises a power take-off housing, an input shaft installed in the power take-off housing, and a bearing, a retaining ring and an oil seal sleeved on the input shaft; the special feature of the power take-off device is that it comprises a sealing structure arranged on the side of the power take-off housing;

[0007] The sealing structure comprises a first step, a second step, an axial hole and a third step which are sequentially provided from the outside to the inside, wherein the first step, the second step and the third step are all annular steps and are coaxial with the axial hole;

[0008] The input shaft is installed in the shaft hole and is clearance-matched with the power take-off housing; the bearing is sleeved at one end of the input shaft located outside the power take-off housing, and one end of the bearing close to the power take-off housing is clamped in the first step, and the inner diameter of the first step is adapted to the outer diameter of the portion of the bearing clamped in the first step;

[0009] The input shaft is provided with a retaining ring installation groove, the position of which corresponds to the position of the second step; the retaining ring is installed in the retaining ring installation groove and is located inside the second step; the inner diameter of the second step is larger than the outer diameter of the retaining ring, and the width of the second step is larger than the width of the retaining ring;

[0010] The inner diameter of the third step is matched with the outer diameter of the oil seal.

[0011] Furthermore, the inner diameter of the third step is larger than the inner diameter of the second step, and smaller than the inner diameter of the first step.

[0012] Furthermore, in order to ensure that the retaining ring can be easily assembled, the depth of the retaining ring installation groove is smaller than the width of the retaining ring, a part of the retaining ring is installed in the retaining ring installation groove, and the other part is located in the second step.

[0013] Furthermore, in order to prevent the oil seal lip from being exposed, the width of the third step is adapted to the width of the oil seal.

[0014] Furthermore, in order to facilitate the assembly of the oil seal, a chamfer is provided on one side of the third step away from the bearing, and the chamfer size is 1X45°.

[0015] Furthermore, in order to solve the vibration problem of the input shaft during operation, the outer diameter of the input shaft installed in the shaft hole is The minimum inner diameter of the shaft hole is

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model provides a power take-off that prevents gas and oil leakage. A first step, a second step, an axial hole and a third step are sequentially provided on the side of a power take-off housing from the outside to the inside. The input shaft of the power take-off passes through the axial hole into the power take-off housing, the bearing is pressed and fixed in the first step, the retaining ring on the input shaft is located in the second step, and the oil seal is pressed and fixed in the third step, which can greatly reduce the risk of gas and lubricating oil flowing inside and outside the power take-off housing.

[0018] 2. The utility model provides a power take-off that prevents gas and oil leakage. The input shaft of the power take-off and the power take-off housing are clearance-matched, and the bearing is pressed in the first step without generating a gap, thereby reducing gas flow to the greatest extent.

[0019] 3. The utility model provides a power take-off that prevents air and oil leakage. The retaining ring is installed in the retaining ring installation groove and is located in the second step to ensure that the input shaft can be smoothly assembled; the oil seal sleeve is arranged on the input shaft and is pressed in the third step to prevent oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic assembly diagram of an embodiment of a power take-off device that prevents gas and oil leakage according to the utility model;

[0021] Figure 2 It is a schematic diagram of an embodiment of a power take-off that prevents air and oil leakage according to the utility model.

[0022] Description of reference numerals:

[0023] 1-power take-off housing; 2-bearing; 3-input shaft; 4-retaining ring; 5-oil seal; 6-shaft hole; 7-first step; 8-second step; 9-third step; 10-retaining ring mounting groove. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] A power take-off device that prevents gas and oil leakage, such as Figure 1 , Figure 2 As shown, it includes a power take-off housing 1, an input shaft 3 installed in the power take-off housing 1, and a bearing 2, a retaining ring 4 and an oil seal 5 sleeved on the input shaft 3. A sealing structure is provided on the outer side of the power take-off housing 1, and the sealing structure includes a first step 7, a second step 8, an axial hole 6 and a third step 9, which are sequentially provided from the outside to the inside. The first step 7, the second step 8 and the third step 9 are all annular steps and are coaxial with the axial hole 6;

[0026] The first step 7 is used to assemble with the bearing 2. The input shaft 3 is installed in the shaft hole 6 of the power take-off housing 1. Since the input shaft 3 will vibrate during operation, the input shaft 3 and the power take-off housing 1 are clearance-fitted. The outer diameter of the part of the input shaft 3 installed in the shaft hole 6 is The minimum inner diameter of the shaft hole 6 is The inner diameter of the first step 7 is closely matched with the outer diameter of the portion of the bearing 2 clamped on the first step 7, so that the bearing 2 is precisely positioned without any gap, thereby minimizing the gas flow and ensuring the rotation accuracy of the input shaft 3.

[0027] The outer surface of the input shaft 3 is provided with retaining ring installation grooves 10 distributed along the circumference, and the retaining ring 4 is installed in the retaining ring installation grooves 10. The retaining ring 4 is adapted to the size of the retaining ring installation grooves 10. In this embodiment, the retaining ring 4 adopts an elastic retaining ring. The inner diameter of the second step 8 is smaller than the inner diameter of the first step 7 and larger than the inner diameter of the shaft hole 6. The second step 8 is used to place the retaining ring 4. After the input shaft 3 is installed inside the power take-off housing 1, the position of the retaining ring installation groove 10 corresponds to the position of the second step 8. The depth of the retaining ring installation groove 10 is smaller than the width of the retaining ring 4. A part of the retaining ring 4 is installed in the retaining ring installation groove 10, and the other part is located in the second step 8. The inner diameter of the second step 8 is slightly larger than the outer diameter of the retaining ring 4, and the depth of the second step 8 is slightly larger than the width of the retaining ring 4, so as to ensure that when the input shaft 3 is assembled, the retaining ring 4 sleeved outside can be easily assembled without being squeezed and misaligned.

[0028] The input shaft 3 is also sleeved with an oil seal 5, which is installed in the third step 9. The inner diameter of the third step 9 is larger than the inner diameter of the shaft hole 6 and smaller than the inner diameter of the second step 8. The inner diameter of the third step 9 is matched with the outer diameter of the oil seal 5, ensuring that the oil seal 5 and the power take-off housing 1, the oil seal 5 and the input shaft 3 are tightly matched to prevent air and oil leakage. The depth of the third step 9 is matched with the width of the oil seal 5, which is used to prevent the lip of the oil seal 5 from being exposed to the outside, improve the sealing performance, and ensure the sealing effect. The outer side of the third step 9 is also provided with a chamfer. In this embodiment, the specification of the chamfer is 1X45°, and the chamfer structure is conducive to improving the assembly efficiency of the oil seal 5.

[0029] The utility model provides an assembly process of a power take-off that prevents gas and oil leakage: the bearing 2 is sleeved on one end of the input shaft 3, and the retaining ring 4 is clamped in the retaining ring installation groove 10 of the input shaft 3 to prevent the bearing 2 from moving in the radial direction. The other end of the input shaft 3 is inserted into the shaft hole 6, and the power take-off housing 1 is sleeved on the input shaft 3. At the same time, the bearing 2 is pressed and clamped into the first step 7 of the power take-off housing 1 to maintain the rotation accuracy of the input shaft 3; the retaining ring 4 is located in the second step 8. Finally, the oil seal 5 is sleeved on the input shaft 3 and pressed in the third step 9 at the same time, which can effectively prevent the lubricating oil from flowing out of the inside of the power take-off housing 1. Through the multiple step structures set on the power take-off housing 1, respectively cooperating with the bearing 2, the retaining ring 4 and the oil seal 5, the occurrence of oil and gas leakage can be greatly reduced. Compared with the prior art, the utility model can greatly reduce the risk of gas and lubricating oil flow between the power take-off and the gearbox, and solve the problem of oil and gas leakage.

Claims

1. A power take-off device that prevents gas and oil leakage, comprising a power take-off housing (1), an input shaft (3) installed in the power take-off housing (1), and a bearing (2), a retaining ring (4) and an oil seal (5) sleeved on the input shaft (3); characterized in that: It includes a sealing structure arranged on the side of the power take-off housing; The sealing structure comprises a first step (7), a second step (8), an axial hole (6) and a third step (9) which are sequentially provided from the outside to the inside, wherein the first step (7), the second step (8) and the third step (9) are all annular steps and are coaxial with the axial hole (6); The input shaft (3) is installed in the shaft hole (6) and is clearance-matched with the power take-off housing (1); the bearing (2) is sleeved on the end of the input shaft (3) located outside the power take-off housing (1); the end of the bearing (2) close to the power take-off housing (1) is clamped in the first step (7); the inner diameter of the first step (7) is adapted to the outer diameter of the portion of the bearing (2) clamped in the first step (7); The input shaft (3) is provided with a retaining ring installation groove (10), the position of the retaining ring installation groove (10) corresponds to the position of the second step (8); the retaining ring (4) is installed in the retaining ring installation groove (10) and is located inside the second step (8); the inner diameter of the second step (8) is greater than the outer diameter of the retaining ring (4), and the width of the second step (8) is greater than the width of the retaining ring (4); The inner diameter of the third step (9) is matched with the outer diameter of the oil seal (5).

2. A power take-off device that prevents air and oil leakage according to claim 1, characterized in that: The inner diameter of the third step (9) is larger than the inner diameter of the second step (8) and smaller than the inner diameter of the first step (7).

3. A power take-off device that prevents air and oil leakage according to claim 2, characterized in that: The depth of the retaining ring installation groove (10) is smaller than the width of the retaining ring (4); a portion of the retaining ring (4) is installed in the retaining ring installation groove (10), and another portion is located in the second step (8).

4. A power take-off device that prevents air and oil leakage according to claim 3, characterized in that: The width of the third step (9) is adapted to the width of the oil seal (5).

5. A power take-off device that prevents air and oil leakage according to any one of claims 1 to 4, characterized in that: A chamfer is provided on one side of the third step (9) away from the bearing (2), and the chamfer has a size of 1×45°.

6. A power take-off device that prevents air and oil leakage according to claim 5, characterized in that: The outer diameter of the input shaft (3) installed in the shaft hole (6) is The minimum inner diameter of the shaft hole (6) is

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