A structure for eliminating thermal displacement of high-speed transmission spline pairs

Abstract

This invention discloses a high-speed transmission spline pair thermal displacement elimination structure, belonging to the field of aero-engine component testing technology. The structure includes a testing device, an intermediate spline shaft, a transmission spline sleeve, and a thermal displacement elimination mechanism. One end of the intermediate spline shaft is connected to the output shaft of the testing device via a diaphragm coupling, and the other end is connected to the transmission spline sleeve. The thermal displacement elimination mechanism is fitted onto the intermediate spline shaft, giving it only a circumferential rotational degree of freedom. Because the axial force that the thermal displacement elimination mechanism can withstand is much greater than the frictional force of the relative sliding between the transmission spline sleeve and the intermediate spline shaft, the thermal displacement elimination mechanism enables the relative sliding between the transmission spline sleeve and the intermediate spline shaft, thereby eliminating the axial displacement of the hot-end shaft system components, ensuring the safety of the diaphragm coupling, ensuring the safe operation of all shaft system components, and guaranteeing the safe conduct of the test.

Description

Technical Field

[0001] This invention relates to a structure for eliminating thermal displacement of a high-speed transmission spline pair, belonging to the field of aero-engine component testing technology. Background Technology

[0002] When conducting thermal load tests on aero-engine test equipment, the test pieces and test transition sections undergo thermal deformation, which is then transmitted to the transmission shaft system. Measures to eliminate thermal displacement must be installed on the transmission shaft system to ensure the safety of transmission shaft system components and ensure the safe conduct of the test.

[0003] As the design requirements for aero-engines become increasingly stringent, testing conditions need to more closely approximate the actual operating conditions of the entire aircraft. Under high-temperature testing conditions, test components and test transition sections experience significant thermal deformation. However, the transmission spline gears, transmitting power at high speeds, are unlikely to slip relative to each other, making it impossible to eliminate the axial deformation displacement of the hot-end shaft components. This can damage the diaphragm coupling of the transmission shaft system, thereby jeopardizing the safety of the shaft system. Therefore, effective measures must be taken to allow the spline gears to slide relative to each other, eliminating the axial displacement of the hot-end shaft components and ensuring the safe operation of all shaft components. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a structure for eliminating thermal displacement of high-speed transmission spline pairs.

[0005] This invention is achieved through the following technical solution:

[0006] A high-speed transmission spline pair thermal displacement elimination structure includes a test device, an intermediate spline shaft, a transmission spline sleeve, and a thermal displacement elimination mechanism. 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 connected to the transmission spline sleeve. The thermal displacement elimination mechanism is fitted on the intermediate spline shaft, giving the intermediate spline shaft only the degree of freedom of rotation in the circumferential direction.

[0007] The testing equipment is a torque meter.

[0008] The thermal displacement elimination mechanism includes a stop bearing housing, which is fixedly installed and mounted on the intermediate spline shaft by two bearings.

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

[0010] The stop bearing housing has an oil cavity along its circumference, and both ends of the inner cavity of the stop bearing housing are provided with seals. Both bearings are located in the oil cavity. The stop bearing housing is provided with an oil inlet hole and an oil return hole that communicate with the oil cavity.

[0011] The top of the stop bearing housing is provided with two oil inlet holes, which are located between the two bearings, and the oil outlets of the two oil inlet holes are arranged close to the two bearings respectively.

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

[0013] The bearing housing has a first oil passage and a second oil passage on both sides of the oil return hole. One end of the first oil passage extends to the seal and the other end is connected to the middle of the oil return hole. One end of the second oil passage 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] The stop bearing housing is equipped with a temperature sensor for detecting bearing temperature, and a vibration sensor is also provided on the stop bearing housing.

[0016] The beneficial effects of this invention are as follows: The intermediate spline shaft and transition shaft in the original transmission shaft system are eliminated, and the intermediate spline shaft is redesigned according to the shaft system dimensions. A thermal displacement elimination mechanism is also added to the intermediate spline shaft. Since the axial force that the thermal displacement elimination mechanism can bear is much greater than the frictional force of the relative sliding between the transmission spline sleeve and the intermediate spline shaft, the thermal displacement elimination mechanism enables the relative sliding between the transmission spline sleeve and the intermediate spline shaft, thereby eliminating the axial displacement of the hot-end shaft system components, ensuring the safety of the diaphragm coupling, ensuring the safe operation of all components in the shaft system, and guaranteeing the safe conduct of the experiment. Attached Figure Description

[0017] Figure 1 This is a 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-Transfer shaft, 4-Transmission spline sleeve, 5-Intermediate spline shaft, 6-Stop bearing housing, 60-Oil cavity, 61-First oil passage, 62-Second oil passage, 63-Oil return hole, 64-Seal, 65-Oil inlet hole, 7-Bearing. Detailed Implementation

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

[0021] like Figure 1 and Figure 2As shown, the high-speed transmission spline pair thermal displacement elimination structure of 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 connected to the transmission spline sleeve 4 in a transmission manner. The thermal displacement elimination mechanism is fitted on the intermediate spline shaft 5, and the intermediate spline shaft 5 has only the degree of freedom of rotation in the circumferential direction.

[0022] The structure of existing transmission shaft systems is as follows Figure 1 As shown, the test equipment 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 via a transition shaft 3 and a diaphragm coupling 2, while the other end extends into the transmission spline sleeve 4 and is connected to it. During the test, the test piece undergoes significant thermal deformation under high-temperature conditions, and the transmission power of the transmission shaft spline is high, making it difficult to achieve relative sliding to eliminate thermal displacement. Specifically, it is difficult to achieve relative sliding at the transmission connection between the intermediate spline shaft 5 and the transmission spline sleeve 4 to eliminate axial thermal displacement. This axial thermal displacement is transmitted to the diaphragm coupling 2 through the transmission spline sleeve 4, the intermediate spline shaft 5, and the transition shaft 3, causing damage to the diaphragm coupling 2 and consequently endangering the safety of the shaft system of the test device 1.

[0023] Therefore, this invention eliminates the intermediate spline shaft 5 and the adapter shaft 3 in the original transmission shaft system, and redesigns the intermediate spline shaft 5 according to the shaft system dimensions. A thermal displacement elimination mechanism is also added to the intermediate spline shaft 5. Since the axial force that the thermal displacement elimination mechanism can withstand is much greater than the frictional force of the relative sliding between the transmission spline sleeve 4 and the intermediate spline shaft 5, the thermal displacement elimination mechanism allows the transmission spline sleeve 4 and the intermediate spline shaft 5 to slide relative to each other, 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 all components in the shaft system, and guaranteeing the safe conduct of the experiment.

[0024] The test equipment 1 is a torsion tester.

[0025] The thermal displacement elimination mechanism includes a stop bearing housing 6, which is fixedly installed and mounted on the intermediate spline shaft 5 via two bearings 7. In use, the stop bearing housing 6 is fixedly installed on a 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 rotational support. Under maximum torque conditions, the axial force that the ultra-precision angular contact ball bearing can withstand is far greater than the frictional force of the relative sliding between the transmission spline sleeve 4 and the intermediate spline shaft 5. Furthermore, the ultra-precision angular contact ball bearing must also meet radial load requirements and the requirements for use under maximum speed conditions.

[0027] The stop bearing housing 6 has an oil cavity 60 arranged circumferentially inside, and a seal 64 is provided at both ends of the inner cavity of the stop bearing housing 6. Both bearings 7 are located in the oil cavity 60. The stop bearing housing 6 is provided with an oil inlet hole 65 and an oil return hole 63 communicating with the oil cavity 60. 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 bearings 7, removes metal shavings, ensures the normal operation of the bearings 7, and extends their service life. On the other hand, the lubricating oil cools the intermediate spline shaft 5 to reduce or even block heat transfer, preventing heat from being transferred to the diaphragm coupling 2 and the test equipment 1, thus protecting the test equipment 1.

[0028] The top of the stop bearing housing 6 is provided with two oil inlet holes 65, which are located between the two bearings 7, and the oil outlets of the two oil inlet holes 65 are arranged close to the two bearings 7 respectively. This allows the lubricating oil newly injected into the oil cavity 60 through the two oil inlet holes 65 to 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 located at the bottom of the stop bearing housing 6 and between the two bearings 7. Positioning the oil return hole 63 at the bottom of the stop bearing housing 6 effectively ensures oil return efficiency.

[0030] The stop bearing housing 6 has a first oil passage 61 and a second oil passage 62 on both sides of the oil return hole 63. One end of the first oil passage 61 extends to the seal 64, and the other end communicates with the middle of the oil return hole 63. One end of the second oil passage 62 communicates with the cavity between the seal 64 and the bearing 7, and the other end communicates 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 housing 6.

[0031] The sealing element 64 adopts a spiral sealing structure. The spiral sealing structure effectively prevents oil and gas leakage.

[0032] The bearing housing 6 is equipped with a temperature sensor for detecting the temperature of the bearing 7, and a vibration sensor is also provided on the bearing housing 6. This facilitates real-time monitoring of the temperature and vibration of the bearing 7.

Claims

1. A structure for eliminating thermal displacement of a high-speed transmission spline pair, characterized in that: The device includes a test equipment (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 equipment (1) through a diaphragm coupling (2), and the other end is connected to the transmission spline sleeve (4). The thermal displacement elimination mechanism is mounted on the intermediate spline shaft (5) and allows the intermediate spline shaft (5) to have only the degree of freedom to rotate in the circumferential direction. The thermal displacement elimination mechanism includes a stop bearing seat (6), which is fixedly installed and mounted on the intermediate spline shaft (5) by two bearings (7); The stop bearing housing (6) is provided with an oil cavity (60) along the circumferential direction, and both ends of the inner cavity of the stop bearing housing (6) are provided with seals (64). Both bearings (7) are located in the oil cavity (60). The stop bearing housing (6) is provided with an oil inlet hole (65) and an oil return hole (63) that communicate with the oil cavity (60).

2. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The test equipment (1) is a torsion tester.

3. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The bearing (7) is an ultra-precision angular contact ball bearing.

4. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The top of the stop bearing housing (6) is provided with two oil inlet holes (65), which are located between the two bearings (7), and the oil outlets of the two oil inlet holes (65) are arranged close to the two bearings (7) respectively.

5. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The oil return hole (63) is located at the bottom of the stop bearing housing (6) and between the two bearings (7).

6. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The bearing housing (6) has a first oil passage (61) and a second oil passage (62) on both sides of the oil return hole (63). One end of the first oil passage (61) extends to the seal (64) and the other end is connected to the middle of the oil return hole (63). One end of the second oil passage (62) is connected to the cavity between the seal (64) and the bearing (7) and the other end is connected to the middle of the oil return hole (63).

7. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The sealing element (64) adopts a spiral sealing structure.

8. The high-speed transmission spline pair thermal displacement elimination structure as described in claim 1, characterized in that: The stop bearing housing (6) is equipped with a temperature sensor for detecting the temperature of the bearing (7), and the stop bearing housing (6) is equipped with a vibration sensor.

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