Transmission lubrication with pressurized oil

Abstract

The invention discloses a transmission lubrication device with pressure lubricating oil, including a hydraulic station and a lubricating device; the lubricating device includes a housing, a through hole is provided on the housing, a comb-tooth shaft sleeve is provided in the through hole, a pressure oil chamber is provided between the comb-tooth shaft sleeve and the housing, an oil inlet connected to the pressure oil chamber is provided on the outside of the housing, a first oil passage connected to the pressure oil chamber is provided on the side wall of the comb-tooth shaft sleeve, a plurality of comb teeth are provided on the inner side wall of the comb-tooth shaft sleeve, bearings are provided on both sides of the comb-tooth shaft sleeve, an oil seal is provided on the outer side of the bearing, a third oil passage passing through the housing is provided between the bearing and the oil seal, and an oil outlet is provided at the end of the third oil passage; a main shaft is provided in the comb-tooth shaft sleeve, the main shaft passes through the bearing and the oil seal, a second oil passage connected to the pressure oil chamber is provided on the main shaft, a blind hole is provided at one end of the main shaft, and the blind hole is connected to the second oil passage through a fifth oil passage. The invention has the advantages of high test efficiency and good reliability of test results when performing performance tests on hydraulic pumps.

Description

Technical Field

[0001] The present invention belongs to the field of detection devices for aviation hydraulic pumps, and in particular relates to an aviation hydraulic pump Background Art

[0002] As an essential core component of the hydraulic system, the hydraulic pump provides hydraulic energy for the entire hydraulic system. The quality of its function affects the normal operation of the entire hydraulic system. Once a hydraulic pump fails, it will affect the performance of the hydraulic system. In more serious cases, it will cause the system to be paralyzed and the hydraulic actuator to be out of control. Therefore, the reliability of the hydraulic pump is particularly important. After the hydraulic pump is assembled, a performance test must be carried out. Especially in the field of aerospace, the performance test of the hydraulic pump is indispensable.

[0003] The transmission shaft is an important component for transmitting power and torque in the hydraulic pump, and the reliability of its structure has an important impact on the performance of the hydraulic pump. In the hydraulic system of the aircraft, the speed of the hydraulic pump can reach 6000r / min. The front end of the transmission shaft is provided with a rectangular spline or an involute spline to bear the load transmission. The rear end of the transmission shaft is provided with a sealing ring, and the front end of the transmission shaft is soaked with lubricating oil. The sealing ring is used to seal the transmission shaft and prevent the lubricating oil from flowing to the rear end of the transmission shaft. The lubricating oil is used to lubricate the front end of the transmission shaft. The lubricating oil is taken from the aircraft lubrication system and has a certain pressure (up to 0.3MPa).

[0004] The performance test of the hydraulic pump includes the test of the sealing performance of the seal ring and the test of the load performance of the hydraulic pump. The most ideal performance test of the hydraulic pump is to assemble the hydraulic pump to the test device and fully simulate the actual working state of the hydraulic pump, that is, to test the sealing performance of the seal ring and the load performance of the hydraulic pump at the same time. However, when fully simulating the actual working state of the hydraulic pump, it is necessary to set a high-demand oil seal in the corresponding test device. The oil seal is required to withstand 0.3MPa pressure and 6000r / min high speed at the same time. The existing oil seal cannot meet the above requirements and is prone to failure. Therefore, the performance test of the existing hydraulic pump is to test the sealing performance of the seal ring and the load performance of the hydraulic pump separately; when testing the sealing performance of the seal ring, the hydraulic pump does not work and the transmission shaft does not rotate. A certain pressure of lubricating oil is injected into the tail end of the transmission shaft through the test device, and only the sealing performance of the seal ring when the transmission shaft is static is tested; when testing the load performance of the hydraulic pump, the lubricating oil in the test device is emptied, and the transmission shaft is not under oil pressure. The transmission shaft is passed through the transmission shaft to apply a load to the hydraulic pump to test the load performance of the hydraulic pump. Since the performance test of the existing hydraulic pump is carried out in steps, the test steps are cumbersome, resulting in low test efficiency; and it fails to simulate the actual working state of the hydraulic pump drive shaft in the aircraft hydraulic system. Due to insufficient testing, the sealing ring at the rear end of the drive shaft may not leak oil during the test, but leak oil in actual use, resulting in poor reliability of the test results.

[0005] Therefore, the existing test equipment for performing performance tests on hydraulic pumps has the defects of low test efficiency and poor reliability of test results. Summary of the invention

[0006] The purpose of the present invention is to provide a transmission lubrication device with pressure lubricating oil. The present invention has the advantages of high test efficiency and good reliability of test results when conducting performance tests on hydraulic pumps.

[0007] The technical solution of the present invention: a transmission lubrication device with pressure lubricating oil, comprising a hydraulic station and a lubrication device;

[0008] The lubricating device comprises a housing, a through hole is provided on the housing, a comb-tooth shaft sleeve is provided in the through hole, a pressure oil chamber is provided between the comb-tooth shaft sleeve and the housing, an oil inlet connected to the pressure oil chamber is provided outside the housing, a first oil passage connected to the pressure oil chamber is provided on the side wall of the comb-tooth shaft sleeve, a plurality of comb teeth are provided on the inner side wall of the comb-tooth shaft sleeve, bearings are provided on both sides of the comb-tooth shaft sleeve, an oil seal is provided on the outer side of the bearing, a third oil passage passing through the housing is provided between the bearing and the oil seal, and an oil outlet is provided at the end of the third oil passage;

[0009] A main shaft is arranged in the comb tooth shaft sleeve, the main shaft passes through the bearing and the oil seal, a second oil passage connected to the pressure oil chamber is arranged on the main shaft, a blind hole is arranged at one end of the main shaft, and the blind hole is connected to the second oil passage through the fifth oil passage.

[0010] In the aforementioned transmission lubrication device with pressurized lubricating oil, a transition sleeve connected to the main shaft is provided in the blind hole, and a connecting structure is provided on the inner wall of the transition sleeve.

[0011] In the aforementioned transmission lubrication device with pressurized lubricating oil, steps are provided at both ends of the through hole, a transfer seat fixed to the housing is provided in the step, and the oil seal is fixed to the housing via the transfer seat.

[0012] In the aforementioned transmission lubrication device with pressurized lubricating oil, a connecting seat fixed to the housing is provided on the outer side of the main shaft, an end of the connecting seat having a blind hole is provided near the main shaft, and a coupling structure is provided on the connecting seat.

[0013] In the aforementioned transmission lubrication device with pressurized lubricating oil, the second oil passage or the third oil passage is connected to a fourth oil passage, and the fourth oil passage passes through the housing and is connected to the hydraulic station through a throttle valve.

[0014] In the aforementioned transmission lubrication device with pressurized lubricating oil, there are two groups of comb teeth, each group has 7 teeth, and the two groups of comb teeth are respectively located on both sides of the first oil channel.

[0015] Compared with the prior art, the present invention focuses on improving the structure related to the oil seal, and by adding comb teeth at the oil receiving front end of the oil seal to reduce the pressure of the lubricating oil, when the high-pressure lubricating oil is introduced into the lubricating device, the oil seal is free from or less affected by the oil pressure, and the oil seal is not easy to fail. On this basis, a load can be applied to the transmission shaft to test the load performance of the hydraulic pump, and at the same time, high-pressure lubricating oil can be injected into the lubricating device to make the sealing ring withstand high oil pressure and test the sealing performance of the sealing ring. The two tests are completed at the same time, which not only has simple test steps and high test efficiency, but also completely simulates the working state of the hydraulic pump, thereby improving the reliability of the test results. Therefore, the performance test of the hydraulic pump by the present invention has the advantages of high test efficiency and good reliability of test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a structural diagram of the lubrication device.

[0018] Figure 3 This is an enlarged view of the comb teeth.

[0019] The marks in the accompanying drawings are: 1-hydraulic station, 2-lubricating device, 3-throttle valve, 4-hydraulic pump, 41-transmission shaft, 42-sealing ring, 5-clamp, 201-housing, 202-through hole, 203-comb tooth sleeve, 204-pressure oil chamber, 205-oil inlet, 206-first oil channel, 207-comb teeth, 208-bearing, 209-oil seal, 210-third oil channel, 211-oil outlet, 212-spindle, 213-second oil channel, 214-blind hole, 215-transition sleeve, 216-adapter seat, 217-connecting seat, 218-combining structure, 219-fourth oil channel, 220-fifth oil channel. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Example. A transmission lubrication device with pressurized lubricating oil, such as Figure 1 As shown, it includes an existing hydraulic station 1 and a lubrication device 2;

[0022] The lubricating device 2 includes a housing 201, a through hole 202 is provided on the housing 201, a comb shaft sleeve 203 is provided in the through hole 202, a pressure oil chamber 204 is provided between the comb shaft sleeve 203 and the housing 201, the pressure oil chamber 204 is formed by an annular groove provided on the inner wall of the through hole, an oil inlet 205 connected to the pressure oil chamber 204 is provided outside the housing 201, the pressure oil chamber 204 is connected to the oil outlet of the hydraulic station through the oil inlet 205, and a side wall of the comb shaft sleeve 203 is provided with a A first oil passage 206 connected to the pressure oil chamber 204, a plurality of comb teeth 207 are provided on the inner wall of the comb tooth shaft sleeve 203, bearings 208 are provided on both sides of the comb tooth shaft sleeve 203, an oil seal 209 is provided on the outer side of the bearing 208, an annular notch is provided on the inner end surface of the oil seal 209, a third oil passage 210 passing through the housing 201 is provided between the bearing 208 and the oil seal 209, an oil outlet 211 is provided at the end of the third oil passage 210, and the oil outlet 211 is connected to the oil return port of the hydraulic station 1;

[0023] A main shaft 212 is arranged in the comb tooth shaft sleeve 203, and the main shaft 212 passes through the bearing 208 and the oil seal 209. A second oil passage 213 connected to the pressure oil chamber 204 is arranged on the main shaft 212, and the second oil passage 213 passes through the comb tooth shaft sleeve 203. A blind hole 214 is arranged at one end of the main shaft 212, and the blind hole 214 is connected to the second oil passage 213 through the fifth oil passage 220.

[0024] A transition sleeve 215 connected to the main shaft 212 is arranged in the blind hole 214, and a connection structure is arranged on the inner wall of the transition sleeve 215. The connection structure refers to a rectangular spline groove or an involute spline groove matched with the front end of the hydraulic pump transmission shaft.

[0025] Both ends of the through hole 202 are provided with steps, and a transfer seat 216 fixed to the housing 201 is provided in the step, and the oil seal 209 is fixed to the housing 201 through the transfer seat 216 .

[0026] A connecting seat 217 fixed to the housing 201 is disposed outside the main shaft 212 , and an end of the connecting seat 217 with a blind hole 214 is disposed near the main shaft 212 . A coupling structure 218 is disposed on the connecting seat 217 , and the coupling structure 218 is an annular mounting edge.

[0027] The second oil passage 213 or the third oil passage 210 is connected to a fourth oil passage 219 . The fourth oil passage 219 passes through the main shaft 212 and the housing 201 in sequence and is connected to the oil return port of the hydraulic station 1 through the throttle valve 3 .

[0028] There are two groups of comb teeth 207 , each group has 7 teeth. The two groups of comb teeth 207 are respectively located on both sides of the first oil channel 206 . There is a gap of 0.05±0.01 mm between the comb tooth sleeve 203 and the main shaft 212 .

[0029] The throttle valve 3 is adjusted to make the oil pressure in the fourth oil passage 219 ≤ 0.3 MPa.

[0030] Installation of the hydraulic pump in the present invention: The outer side of the transmission shaft of the hydraulic pump 4 has an annular mounting edge, the transmission shaft 41 of the hydraulic pump 4 is aligned with the transition sleeve 215, the transmission shaft 41 is inserted into the transition sleeve 215, the mounting edge of the hydraulic pump 4 is combined with the mounting edge of the present invention, and the clamp 5 is used to fix the two mounting edges together.

[0031] Working principle: According to the existing method for measuring the load performance of a hydraulic pump, a motor is connected to one end of the main shaft 212. The motor drives the main shaft 212 to rotate. The main shaft 212 drives the transmission shaft 41 to rotate through the transition sleeve 215. The transmission shaft 41 has a load to simulate the state of the hydraulic pump in normal operation. By adjusting the motor speed and the load size of the hydraulic pump, the load performance of the hydraulic pump is measured.

[0032] While the transmission shaft 41 rotates, the hydraulic station 1 outputs high-pressure lubricating oil. The lubricating oil passes through the oil inlet 205, the first oil channel 206, the pressure oil chamber 204, the second oil channel 213, and the fifth oil channel 220 to reach the blind hole 214 to lubricate the transmission shaft 41. The lubricating oil reaches the sealing ring 42, and the sealing ring 42 is subjected to the oil pressure. The oil pressure borne by the sealing ring 42 is adjusted by adjusting the throttle valve 3. When the oil pressure is higher than the set value of the throttle valve 3, the lubricating oil flows back to the hydraulic station from the fourth oil channel 219 and the throttle valve 3. When the setting value of the throttle valve 3 reaches 0.3MPa, the hydraulic station 1 needs to provide a lubricating oil flow rate of not less than 6L / min. After the measurement, remove the hydraulic pump and observe whether there is oil leakage at the sealing ring. If there is oil leakage, the sealing performance of the sealing ring is unqualified, otherwise, it is qualified.

[0033] The present invention can simultaneously adjust the load size of the hydraulic pump and the pressure size of the sealing ring, completely simulate various states that the hydraulic pump may encounter in actual work, and improve the reliability of the test.

[0034] The present invention solves the problem of oil seal failure: the high-pressure lubricating oil in the second oil passage 213 flows to both sides through the comb teeth 207, and after the pressure reduction of the comb teeth 207, passes through the bearing 208 to reach the oil seal 209, dissipates the heat of the oil seal 209, takes away the friction heat between the oil seal 209 and the main shaft 212, and then flows back to the hydraulic station 1 from the third oil passage 210 and the oil outlet 211. Since the pressure on the oil seal 209 is small, the oil seal 209 will not be pressed against the main shaft 212 by the pressure, the friction heat between the oil seal 209 and the main shaft 212 is small, and the friction heat can be taken away in time, the oil seal 209 is not easy to be damaged, and it is not easy to fail, so it can be used normally in the present invention.

[0035] Therefore, the performance test of the hydraulic pump according to the present invention has the advantages of high test efficiency and good reliability of test results.

Claims

1. A transmission lubrication device with pressurized lubricating oil, characterized in that: It comprises a hydraulic station (1) and a lubricating device (2); The lubricating device (2) comprises a housing (201), a through hole (202) is provided on the housing (201), a comb shaft sleeve (203) is provided in the through hole (202), a pressure oil chamber (204) is provided between the comb shaft sleeve (203) and the housing (201), an oil inlet (205) connected to the pressure oil chamber (204) is provided outside the housing (201), and a side wall of the comb shaft sleeve (203) is provided with a A first oil passage (206) connected to the housing (201) is provided, a plurality of comb teeth (207) are provided on the inner side wall of the comb tooth shaft sleeve (203), bearings (208) are provided on both sides of the comb tooth shaft sleeve (203), an oil seal (209) is provided on the outer side of the bearing (208), a third oil passage (210) passing through the housing (201) is provided between the bearing (208) and the oil seal (209), and an oil outlet (211) is provided at the end of the third oil passage (210); A main shaft (212) is arranged in the comb tooth shaft sleeve (203), the main shaft (212) passes through a bearing (208) and an oil seal (209), a second oil passage (213) connected to the pressure oil chamber (204) is arranged on the main shaft (212), a blind hole (214) is arranged at one end of the main shaft (212), and the blind hole (214) is connected to the second oil passage (213) through a fifth oil passage (220); The second oil passage (213) or the third oil passage (210) is connected to a fourth oil passage (219), and the fourth oil passage (219) passes through the housing (201) and is connected to the hydraulic station (1) via a throttle valve (3); A transition sleeve (215) connected to the main shaft (212) is arranged in the blind hole (214), and a connecting structure is arranged on the inner wall of the transition sleeve (215); The transmission lubrication device is used to test a hydraulic pump. A sealing ring (42) is provided on a transmission shaft (41) of the hydraulic pump. The test objects are the load performance of the hydraulic pump and the sealing performance of the sealing ring (42). When the test is performed, the transmission shaft (41) is inserted into a transition sleeve (215).

2. The transmission lubrication device with pressurized lubricating oil according to claim 1, characterized in that: Both ends of the through hole (202) are provided with steps, and a transfer seat (216) fixed to the housing (201) is provided in the step, and the oil seal (209) is fixed to the housing (201) via the transfer seat (216).

3. The transmission lubrication device with pressurized lubricating oil according to claim 1, characterized in that: A connecting seat (217) fixed to the housing (201) is provided on the outside of the main shaft (212); an end of the connecting seat (217) close to the main shaft (212) is provided with a blind hole (214); and a coupling structure (218) is provided on the connecting seat (217).

4. The transmission lubrication device with pressurized lubricating oil according to claim 1, characterized in that: There are two groups of comb teeth (207), each group has seven teeth, and the two groups of comb teeth (207) are respectively located on both sides of the first oil channel (206).

5. The transmission lubrication device with pressurized lubricating oil according to claim 1, characterized in that: There is a gap of 0.05±0.01 mm between the comb tooth shaft sleeve (203) and the main shaft (212).

6. The transmission lubrication device with pressurized lubricating oil according to claim 1, characterized in that: The throttle valve (3) is adjusted so that the oil pressure in the fourth oil passage (219) is ≤ 0.3 MPa.

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