High-speed transmission spline pair thermal displacement eliminating structure

Abstract

The invention discloses a thermal displacement eliminating structure for a high-speed transmission spline pair, and belongs to the technical field of aero-engine part tests. The structure comprises a test device, a middle spline shaft, a transmission spline housing and a thermal displacement eliminating mechanism, one end of the middle spline shaft is connected with an output shaft of the test device through a membrane disc coupling, the other end of the middle spline shaft is in transmission connection with the transmission spline housing, and the thermal displacement eliminating mechanism is sleeved on the middle spline shaft. And the middle spline shaft only has the degree of freedom of rotating in the circumferential direction. Due to the fact that the axial force borne by the thermal displacement eliminating mechanism is far larger than the friction force of relative sliding of the transmission spline sleeve and the middle spline shaft, the transmission spline sleeve and the middle spline shaft can slide relative to each other through the thermal displacement eliminating mechanism, then the axial displacement of a hot end shafting component is eliminated, and the safety of the membrane disc coupler is guaranteed. And safe operation of parts of the shaft system is ensured, and safe test development is ensured.

Description

Technical Field

[0001] The invention relates to a high-speed transmission spline pair thermal displacement elimination structure, belonging to the technical field of aviation engine component testing. Background Art

[0002] When aircraft engine test equipment is conducting heat load tests, the test piece and the test transition section will produce thermal deformation, which is then transmitted to the drive shaft system. Measures must be set on the drive shaft system to eliminate thermal displacement to protect the safety of the drive shaft system components and ensure the safe conduct of the test.

[0003] As the design requirements of aircraft engines become increasingly demanding, the test state needs to be closer to the working conditions of the entire machine. Under high-temperature test conditions, the test piece and the test transition section will experience large thermal deformation due to heat, and it is difficult for the transmission spline sleeve teeth to slip relatively when transmitting power at high speed. It is impossible to eliminate the axial deformation displacement of the hot-end shaft system components, which will cause damage to the diaphragm coupling of the transmission shaft system and endanger the safety of the shaft system. Therefore, effective measures must be taken to allow the spline sleeve teeth to achieve relative sliding to eliminate the axial displacement of the hot-end shaft system components and ensure the safe operation of all shaft system components. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-speed transmission spline pair thermal displacement elimination structure.

[0005] The present invention is achieved through the following technical solutions:

[0006] A high-speed transmission spline pair thermal displacement elimination structure comprises a test device, an intermediate spline shaft, a transmission spline sleeve and a thermal displacement elimination mechanism, wherein one end of the intermediate spline shaft is connected to the output shaft of the test device through a diaphragm coupling, and the other end is transmission-connected to the transmission spline sleeve; the thermal displacement elimination mechanism is sleeved on the intermediate spline shaft and enables the intermediate spline shaft to have only the degree of freedom of rotation in the circumferential direction.

[0007] The test equipment is a torque meter.

[0008] The thermal displacement elimination mechanism comprises an interrupted bearing seat, which is fixedly arranged and sleeved on the middle spline shaft through two bearings.

[0009] The bearing is an ultra-precision angular contact ball bearing.

[0010] An oil cavity is circumferentially arranged in the stop bearing seat, and seals are arranged at both ends of the inner cavity of the stop bearing seat. Both bearings are located in the oil cavity, and an oil inlet hole and an oil return hole connected to the oil cavity are arranged on the stop bearing seat.

[0011] The top of the stop bearing seat is provided with two oil inlet holes, the two oil inlet holes are located between the two bearings, and the oil outlet ends of the two oil inlet holes are arranged one by one close to the two bearings.

[0012] The oil return hole is arranged at the bottom of the stop bearing seat and is located between the two bearings.

[0013] A first oil channel and a second oil channel are provided on both sides of the oil return hole on the stop bearing seat. One end of the first oil channel extends to the seal, and the other end is connected to the middle of the oil return hole. One end of the second oil channel is connected to the cavity between the seal and the bearing, and the other end is connected to the middle of the oil return hole.

[0014] The sealing element adopts a spiral sealing structure.

[0015] A temperature sensor for detecting the bearing temperature is arranged in the stop bearing seat, and a vibration sensor is arranged on the stop bearing seat.

[0016] The beneficial effects of the present invention are: the intermediate spline shaft and the adapter shaft in the original transmission shaft system are eliminated, and the intermediate spline shaft is redesigned according to the shaft system size, and a thermal displacement elimination mechanism is added to the intermediate spline shaft. Since the axial force that the thermal displacement elimination mechanism can bear is much greater than the friction force of the relative sliding of the transmission spline sleeve and the intermediate spline shaft, the transmission spline sleeve and the intermediate spline shaft can slide relative to each other through the thermal displacement elimination mechanism, thereby eliminating the axial displacement of the hot end shaft system components, ensuring the safety of the diaphragm coupling, ensuring the safe operation of various shaft system components, and ensuring the safe conduct of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the existing transmission shaft system;

[0018] Figure 2 It is a structural schematic diagram of the present invention.

[0019] In the figure: 1-test equipment, 2-diaphragm coupling, 3-adapter shaft, 4-transmission spline sleeve, 5-intermediate spline shaft, 6-stop bearing seat, 60-oil chamber, 61-first oil channel, 62-second oil channel, 63-oil return hole, 64-seal, 65-oil inlet hole, 7-bearing. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0021] like Figure 1 and Figure 2As shown, a high-speed transmission spline pair thermal displacement elimination structure described in the present invention includes a test device 1, an intermediate spline shaft 5, a transmission spline sleeve 4 and a thermal displacement elimination mechanism, one end of the intermediate spline shaft 5 is connected to the output shaft of the test device 1 through a diaphragm coupling 2, and the other end extends into the transmission spline sleeve 4 and is transmission-connected to the transmission spline sleeve 4, the thermal displacement elimination mechanism is sleeved on the intermediate spline shaft 5, and the intermediate spline shaft 5 only has the degree of freedom of rotation along the circumferential direction.

[0022] The structure of the existing transmission shaft system is as follows Figure 1 As shown, it includes a transmission spline sleeve 4, an intermediate spline shaft 5 and a test device 1. One end of the intermediate spline shaft 5 is connected to the output shaft of the test device 1 through the adapter shaft 3 and the diaphragm coupling 2, and the other end extends into the transmission spline sleeve 4 and is transmission-connected with the transmission spline sleeve 4. During the test, under the high-temperature working condition test condition, the test piece has a large thermal deformation and a large power transmission of the transmission shaft system spline, and it is difficult to achieve relative sliding to eliminate thermal displacement, that is, it is difficult to achieve relative sliding at the transmission connection of the intermediate spline shaft 5 and the transmission spline sleeve 4 to eliminate axial thermal displacement. The axial thermal displacement will be transmitted to the diaphragm coupling 2 through the transmission spline sleeve 4, the intermediate spline shaft 5 and the adapter shaft 3, which will cause damage to the diaphragm coupling 2, and then endanger the safety of the shaft system of the test device 1.

[0023] To this end, the present invention cancels the intermediate spline shaft 5 and the adapter shaft 3 in the original transmission shaft system, redesigns the intermediate spline shaft 5 according to the shaft system size, and adds a thermal displacement elimination mechanism to the intermediate spline shaft 5. Since the axial force that the thermal displacement elimination mechanism can bear is much greater than the friction force of the relative sliding of the transmission spline sleeve 4 and the intermediate spline shaft 5, the transmission spline sleeve 4 and the intermediate spline shaft 5 can slide relative to each other through the thermal displacement elimination mechanism, thereby eliminating the axial displacement of the hot end shaft system components, ensuring the safety of the diaphragm coupling 2, ensuring the safe operation of each shaft system component, and ensuring the safe conduct of the test.

[0024] The test device 1 is a torque meter.

[0025] The thermal displacement elimination mechanism comprises a suspension bearing seat 6, which is fixedly arranged and sleeved on the intermediate spline shaft 5 through two bearings 7. When in use, the suspension bearing seat 6 is fixedly installed on the machine base, etc.

[0026] The bearing 7 is an ultra-precision angular contact ball bearing. Two ultra-precision angular contact ball bearings are paired together as a rotation support. Under the maximum torque condition, the axial force that the ultra-precision angular contact ball bearing can bear is much greater than the friction force of the relative sliding between the transmission spline sleeve 4 and the intermediate spline shaft 5. In addition, the ultra-precision angular contact ball bearing must also meet the radial load requirements and the highest speed working condition requirements.

[0027] An oil cavity 60 is provided in the circumferential direction of the stop bearing seat 6, and seals 64 are provided at both ends of the inner cavity of the stop bearing seat 6. Both bearings 7 are located in the oil cavity 60, and an oil inlet hole 65 and an oil return hole 63 communicating with the oil cavity 60 are provided on the stop bearing seat 6. During the test, lubricating oil is continuously added to the oil cavity 60 through the oil inlet hole 65. On the one hand, the lubricating oil lubricates and cools the bearing 7, and takes away metal chips, ensuring the normal operation of the bearing 7 and extending its service life; on the other hand, the lubricating oil cools the intermediate spline shaft 5 to reduce or even block heat transfer, avoid heat transfer to the diaphragm coupling 2 and the test equipment 1, and protect the test equipment 1.

[0028] The top of the stop bearing seat 6 is provided with two oil inlet holes 65, the two oil inlet holes 65 are located between the two bearings 7, and the oil outlet ends of the two oil inlet holes 65 are arranged one by one close to the two bearings 7. The lubricating oil newly injected into the oil cavity 60 through the two oil inlet holes 65 can quickly cool the two bearings 7, thereby improving the cooling effect of the lubricating oil on the bearings 7.

[0029] The oil return hole 63 is arranged at the bottom of the suspension bearing seat 6 and is located between the two bearings 7. The oil return hole 63 is arranged at the bottom of the suspension bearing seat 6, which effectively ensures the oil return efficiency.

[0030] The first oil passage 61 and the second oil passage 62 are provided on both sides of the oil return hole 63 of the stop bearing seat 6. One end of the first oil passage 61 extends to the seal 64, and the other end is communicated with the middle of the oil return hole 63. One end of the second oil passage 62 is communicated with the cavity between the seal 64 and the bearing 7, and the other end is communicated with the middle of the oil return hole 63. The first oil passage 61 and the second oil passage 62 further improve the oil return efficiency of the lubricating oil in the stop bearing seat 6.

[0031] The sealing member 64 adopts a spiral sealing structure, which effectively prevents oil and gas from leaking out.

[0032] A temperature sensor for detecting the temperature of the bearing 7 is arranged in the suspension bearing seat 6, and a vibration sensor is arranged on the suspension bearing seat 6. It is convenient to monitor the temperature and vibration of the bearing 7 in real time.

Claims

1. A high-speed transmission spline pair thermal displacement elimination structure, characterized in that: The invention comprises a test device (1), an intermediate spline shaft (5), a transmission spline sleeve (4) and a thermal displacement elimination mechanism, wherein one end of the intermediate spline shaft (5) is connected to the output shaft of the test device (1) via a diaphragm coupling (2), and the other end is transmission-connected to the transmission spline sleeve (4); the thermal displacement elimination mechanism is sleeved on the intermediate spline shaft (5) and enables the intermediate spline shaft (5) to have only the degree of freedom of rotation in the circumferential direction.

2. The high-speed transmission spline pair thermal displacement elimination structure according to claim 1, characterized in that: The test equipment (1) is a torque meter.

3. The high-speed transmission spline pair thermal displacement elimination structure according to claim 1, characterized in that: The thermal displacement elimination mechanism comprises a stop bearing seat (6), which is fixedly arranged and sleeved on the intermediate spline shaft (5) via two bearings (7).

4. The high-speed transmission spline pair thermal displacement elimination structure according to claim 3, characterized in that: The bearing (7) is an ultra-precision angular contact ball bearing.

5. The high-speed transmission spline pair thermal displacement elimination structure according to claim 3, characterized in that: An oil cavity (60) is circumferentially provided in the stop bearing seat (6), and sealing members (64) are provided at both ends of the inner cavity of the stop bearing seat (6). Both bearings (7) are located in the oil cavity (60), and an oil inlet hole (65) and an oil return hole (63) communicating with the oil cavity (60) are provided on the stop bearing seat (6).

6. The high-speed transmission spline pair thermal displacement elimination structure according to claim 5, characterized in that: The top of the stop bearing seat (6) is provided with two oil inlet holes (65), the two oil inlet holes (65) are located between the two bearings (7), and the oil outlet ends of the two oil inlet holes (65) are arranged close to the two bearings (7) in a one-to-one correspondence.

7. The high-speed transmission spline pair thermal displacement elimination structure according to claim 5, characterized in that: The oil return hole (63) is arranged at the bottom of the stop bearing seat (6) and is located between the two bearings (7).

8. The high-speed transmission spline pair thermal displacement elimination structure according to claim 5, characterized in that: A first oil passage (61) and a second oil passage (62) are provided on both sides of the oil return hole (63) on the stop bearing seat (6); one end of the first oil passage (61) extends to the seal (64), and the other end is communicated with the middle of the oil return hole (63); one end of the second oil passage (62) is communicated with the cavity between the seal (64) and the bearing (7), and the other end is communicated with the middle of the oil return hole (63).

9. The high-speed transmission spline pair thermal displacement elimination structure according to claim 5, characterized in that: The sealing element (64) adopts a spiral sealing structure.

10. The high-speed transmission spline pair thermal displacement elimination structure according to claim 5, characterized in that: A temperature sensor for detecting the temperature of the bearing (7) is arranged inside the stop bearing seat (6), and a vibration sensor is arranged on the stop bearing seat (6).

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