Driveshaft spline lubrication mechanism and lubrication method

Abstract

The present invention provides a spline lubrication mechanism and lubrication method for a transmission shaft, belonging to the technical field of aviation industry pumps. It includes a first transmission shaft, a second transmission shaft, a third transmission shaft and an oil injection assembly. The first transmission shaft, the second transmission shaft and the third transmission shaft are all hollow structures. The hollow cavity of the first transmission shaft is communicated with the hollow cavity of the third transmission shaft through the hollow cavity of the second transmission shaft. The hollow cavity of the third transmission shaft is communicated with the inner cavity of the pump housing. The oil injection assembly is arranged in the hollow cavity of the first transmission shaft. The lubricating oil sprayed by the oil injection assembly sequentially passes through the hollow cavity of the first transmission shaft, the hollow cavity of the second transmission shaft and the hollow cavity of the third transmission shaft and flows into the pump housing. It flows the lubricating oil into the pump housing through the hollow cavities of the first transmission shaft, the second transmission shaft and the third transmission shaft to lubricate the splines of the transmission shaft, eliminating the mutual grinding phenomenon and eccentric grinding phenomenon between the transmission shaft and the rotating mechanisms at both ends.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation industry pumps, and relates to the lubrication technology in the testing process of aviation industry pumps, specifically a spline lubrication mechanism and lubrication method for a drive shaft. Background Art

[0002] The spline of the drive shaft in an aviation industry pump is one of the core components for transmission connection in an aviation pump testing system. Its main function is to provide high-speed and stable rotational speed and torque for the aviation pump under the testing requirements of the aviation pump, so as to achieve the purpose of long-term testing.

[0003] Since the splines of the drive shaft and its impeller shaft meshing in the aviation industry pump are both located inside the pump housing, and the nut locking structure of the drive shaft of the aviation industry pump separates the shaft end of the meshing splines of the drive shaft and the impeller shaft, it causes the lubricating oil under the conventional mounting seat shaft end connection structure to be unable to enter the meshing position inside the housing for lubrication. Moreover, when the drive shaft of the aviation pump is in a hollow state, although an eccentric oil hole is installed at the shaft end, when the test rotational speed is greater than 20,000 r / min, the lubricating oil cannot be sprayed into the pump housing for spline lubrication through the traditional nozzle oil jet method, resulting in mutual grinding and eccentric grinding phenomena occurring many times between the drive shaft and the rotating mechanisms at both ends during the long-term test process. Summary of the Invention

[0004] Aiming at the problem that the traditional method cannot achieve spline lubrication inside the pump housing during the long-term test of the above-mentioned aviation industry pump, and mutual grinding and eccentric grinding phenomena occur many times between the drive shaft and the rotating mechanisms at both ends, the present invention proposes a spline lubrication mechanism and lubrication method for a drive shaft.

[0005] In order to solve the problem of spline lubrication inside the housing, the present invention proposes a spline lubrication mechanism to meet the spline lubrication inside the pump housing during the long-term test of the aviation industry pump, solves the design defect of the existing transmission mechanism, and fills the current technical gap. The specific technical solution is as follows:

[0006] The spline lubrication mechanism for a drive shaft includes a first drive shaft, a second drive shaft, a third drive shaft, and an oil injection assembly. The first drive shaft, the second drive shaft, and the third drive shaft are all hollow structures. The hollow cavity of the first drive shaft is communicated with the hollow cavity of the third drive shaft through the hollow cavity of the second drive shaft. The hollow cavity of the third drive shaft is communicated with the inner cavity of the pump housing. The oil injection assembly is arranged in the hollow cavity of the first drive shaft. The lubricating oil sprayed by the oil injection assembly sequentially passes through the hollow cavity of the first drive shaft, the hollow cavity of the second drive shaft, and the hollow cavity of the third drive shaft and flows into the pump housing.

[0007] Further defined, a spiral diversion groove is arranged on the cavity wall of the hollow cavity of the second transmission shaft, and the lubricating oil in the hollow cavity of the second transmission shaft flows into the hollow cavity of the third transmission shaft through the spiral diversion groove.

[0008] Further defined, the oil injection assembly includes a lubricating oil spray pipe and an atomizing nozzle. Both the lubricating oil spray pipe and the atomizing nozzle are arranged in the hollow cavity of the first transmission shaft. One end of the lubricating oil spray pipe is fixedly connected to the first transmission shaft, the other end of the lubricating oil spray pipe is connected to the atomizing nozzle, and the atomizing nozzle is arranged on the side close to the second transmission shaft.

[0009] Further defined, the lubricating oil spray pipe is fixedly connected to the first transmission shaft through an end cover at the shaft tail, and the lubricating oil spray pipe is coaxially arranged with the first transmission shaft.

[0010] Further defined, a gap of 2 mm - 3 mm is left between the cavity wall of the hollow cavity of the first transmission shaft and the lubricating oil spray pipe.

[0011] Further defined, the transmission shaft spline lubrication mechanism further includes an impeller shaft. The impeller shaft is arranged in the pump housing, and the impeller shaft is connected to the third transmission shaft through a transmission shaft spline.

[0012] Further defined, the hollow cavity of the first transmission shaft is a stepped structure with the axial aperture decreasing in sequence.

[0013] Further defined, the first transmission shaft is connected to the second transmission shaft through a rectangular spline, and the second transmission shaft is connected to the third transmission shaft through an involute spline.

[0014] Further defined, the groove width of the spiral diversion groove is 8 mm - 12 mm, and the groove depth is 1 mm - 3 mm.

[0015] Based on the transmission shaft spline lubrication mechanism described above, the transmission shaft spline lubrication method includes the following steps:

[0016] The lubricating oil in the lubricating oil spray pipe forms atomized lubricating oil after being sprayed out through the atomizing nozzle. The atomized lubricating oil passes through the hollow cavity of the first transmission shaft and flows into the spiral diversion groove in the hollow cavity of the second transmission shaft;

[0017] During the rotation of the second transmission shaft, a spiral driving air flow is formed in the spiral diversion groove. The atomized lubricating oil in the spiral diversion groove flows into the hollow cavity of the third transmission shaft under the push of the spiral driving air flow, and passes through the hollow cavity of the third transmission shaft and flows into the pump housing to lubricate the transmission shaft spline in the pump housing.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, the first transmission shaft, the second transmission shaft, and the third transmission shaft are all provided with a hollow structure. The hollow cavity of the third transmission shaft is communicated with the pump housing. An oil injection assembly is arranged in the hollow cavity of the first transmission shaft. Lubricating oil is ejected through the oil injection assembly. During the rotation of the first transmission shaft, the second transmission shaft, and the third transmission shaft, the ejected lubricating oil flows along the hollow cavity of the first transmission shaft, the hollow cavity of the second transmission shaft, and the hollow cavity of the third transmission shaft into the pump housing to lubricate the splines of the transmission shafts in the pump housing. The lubrication mechanism of the present invention is not affected by the rotational speed required by the test, and can conveniently lubricate the splines of the transmission shafts in the pump housing, eliminating the mutual abrasion and eccentric abrasion phenomena between the transmission shafts and the rotating mechanisms at both ends during the long-term test.

[0020] 2. A spiral flow guide groove is arranged on the cavity wall of the hollow cavity of the second transmission shaft. Specifically, the spiral direction of the spiral flow guide groove is the same as the rotation direction of the second transmission shaft. During the rotation of the second transmission shaft, a spiral driving air flow will be formed in the spiral flow guide groove. Under the action of the spiral driving air flow, the lubricating oil in the spiral flow guide groove is pushed forward and finally flows into the hollow cavity of the third transmission shaft and then into the pump housing through the hollow cavity of the third transmission shaft to lubricate the splines of the transmission shafts in the pump housing.

[0021] 3. The hollow cavity of the first transmission shaft is set to a stepped structure with the axial aperture decreasing in sequence. This structure not only does not affect the rotation of the first transmission shaft, but also facilitates the installation of the oil injection assembly, and can also ensure the strength of the first transmission shaft.

[0022] 4. The first transmission shaft is connected to the second transmission shaft through a rectangular spline, and the second transmission shaft is connected to the third transmission shaft through an involute spline. The lubricating oil flowing through the hollow cavities of the first transmission shaft, the second transmission shaft, and the third transmission shaft can also lubricate the rectangular spline and the involute spline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the transmission shaft spline lubrication mechanism of the present invention;

[0024] Figure 2 is Figure 1 a partial enlarged view of part Ⅰ in

[0025] Figure 3 is Figure 1 a partial enlarged view of part Ⅱ in

[0026] Figure 4 is a connection schematic diagram of the first transmission shaft and the lubricating oil spray pipe;

[0027] Among them, 1 - the first transmission shaft, 2 - the lubricating oil spray pipe, 3 - the atomizing nozzle, 4 - the second transmission shaft, 5 - the third transmission shaft, 6 - the impeller shaft, 7 - the shaft end cover, 8 - the diversion groove. Detailed implementation manners

[0028] The technical solutions of the present invention will be further explained below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0029] Embodiment 1

[0030] Refer to Figure 1 , the transmission shaft spline lubrication mechanism of this embodiment includes the first transmission shaft 1, the second transmission shaft 4, the third transmission shaft 5 and the oil injection assembly. The first transmission shaft 1, the second transmission shaft 4 and the third transmission shaft 5 are all hollow structures. Specifically, the first transmission shaft 1 is provided with a through hollow cavity along the axial direction, the second transmission shaft 4 is provided with a through hollow cavity along the axial direction, and the third transmission shaft 5 is provided with a through hollow cavity along the axial direction. The hollow cavity of the first transmission shaft 1 is communicated with the hollow cavity of the third transmission shaft 5 through the hollow cavity of the second transmission shaft 4. Refer to Figure 3 , the hollow cavity of the third transmission shaft 5 is communicated with the inner cavity of the pump housing, and the oil injection assembly is arranged in the hollow cavity of the first transmission shaft 1. The lubricating oil sprayed by the oil injection assembly sequentially passes through the hollow cavity of the first transmission shaft 1, the hollow cavity of the second transmission shaft 4 and the hollow cavity of the third transmission shaft 5 and flows into the pump housing to lubricate the transmission shaft spline in the pump housing.

[0031] Preferably, the hollow cavity of the first transmission shaft 1 of this embodiment is a stepped structure with the axial aperture decreasing in sequence. Among them, the aperture of the inner cavity for installing the oil injection assembly is 2 mm, and the aperture of the inner cavity for connecting with the second transmission shaft 4 is less than 2 mm, which not only facilitates the installation of the oil injection assembly but also ensures the strength of the first transmission shaft 1.

[0032] Preferably, refer to Figure 2 , a spiral diversion groove 8 is arranged on the cavity wall of the hollow cavity of the second transmission shaft 4 of this embodiment. The lubricating oil in the hollow cavity of the second transmission shaft 4 flows into the hollow cavity of the third transmission shaft 5 through the spiral diversion groove 8. Further preferably, there are multiple spiral diversion grooves 8, and multiple spiral diversion grooves 8 are arranged in parallel. Specifically, there are 4 spiral diversion grooves 8 in this embodiment, and the number thereof can be increased or decreased according to actual needs. The groove width of the spiral diversion groove 8 is 10 mm, the groove depth is 2 mm, and the pitch between adjacent two spiral diversion grooves 8 is 100 mm.

[0033] It should be noted that the groove width of the spiral diversion groove 8 can also be designed as 8 mm, 9 mm, 11 mm or 12 mm according to actual dimensions; the groove depth of the spiral diversion groove 8 can also be designed as 1 mm or 3 mm according to actual dimensions.

[0034] The fuel injection component of this embodiment includes a lubricating oil spray pipe 2 and an atomizing nozzle 3. Both the lubricating oil spray pipe 2 and the atomizing nozzle 3 are arranged in the hollow cavity of the first transmission shaft 1. One end of the lubricating oil spray pipe 2 is fixedly connected to the first transmission shaft 1, the other end of the lubricating oil spray pipe 2 is connected to the atomizing nozzle 3, and the atomizing nozzle 3 is arranged on the side close to the second transmission shaft 4.

[0035] Preferably, as shown in Figure 4 , the lubricating oil spray pipe 2 is fixedly connected to the first transmission shaft 1 through a shaft end cover 7, and the lubricating oil spray pipe 2 is coaxially arranged with the first transmission shaft 1.

[0036] Further preferably, a 3-mm gap is left between the cavity wall of the hollow cavity of the first transmission shaft 1 and the lubricating oil spray pipe 2. It should be noted that the size of this gap can also be designed to be 2 mm or 2.5 mm according to the actual size.

[0037] The transmission shaft spline lubrication mechanism of this embodiment further includes an impeller shaft 6. The impeller shaft 6 is arranged in the pump housing. The impeller shaft 6 is connected to the third transmission shaft 5 through a transmission shaft spline. Among them, the transmission shaft spline is also arranged in the pump housing.

[0038] Preferably, the first transmission shaft 1 is connected to the second transmission shaft 4 through a rectangular spline, and the second transmission shaft 4 is connected to the third transmission shaft 5 through an involute spline. The lubricating oil flowing between the first transmission shaft 1 and the second transmission shaft 4 can also lubricate the rectangular spline, and the lubricating oil flowing between the second transmission shaft 4 and the third transmission shaft 5 can also lubricate the involute spline.

[0039] Embodiment 2

[0040] The transmission shaft spline lubrication method of this embodiment is formed on the basis of the transmission shaft spline lubrication mechanism of Embodiment 1. The specific steps are as follows:

[0041] Form the transmission shaft spline lubrication mechanism of Embodiment 1;

[0042] Start the first transmission shaft 1, the second transmission shaft 4 and the third transmission shaft 5 to rotate. At the same time, apply a pressure of 1.2 Mpa to the lubricating oil spray pipe 2, so that the lubricating oil in the lubricating oil spray pipe 2 forms atomized lubricating oil after being sprayed out through the atomizing nozzle 3. The atomized lubricating oil passes through the hollow cavity of the first transmission shaft 1 and flows into the spiral guide groove 8 in the hollow cavity of the second transmission shaft 4;

[0043] During the rotation of the second transmission shaft 4, a spiral driving air flow is formed in the spiral guide groove 8. The atomized lubricating oil in the spiral guide groove 8 flows into the hollow cavity of the third transmission shaft 5 under the push of the spiral driving air flow, and passes through the hollow cavity of the third transmission shaft 5 and flows into the pump housing to lubricate the transmission shaft spline in the pump housing.

Claims

1. A spline lubrication mechanism for a transmission shaft, characterized in that, It includes a first transmission shaft (1), a second transmission shaft (4), a third transmission shaft (5) and an oil injection assembly. The first transmission shaft (1), the second transmission shaft (4) and the third transmission shaft (5) are all of hollow structures. The hollow cavity of the first transmission shaft (1) is communicated with the hollow cavity of the third transmission shaft (5) through the hollow cavity of the second transmission shaft (4). The hollow cavity of the third transmission shaft (5) is communicated with the inner cavity of the pump housing. The oil injection assembly is arranged in the hollow cavity of the first transmission shaft (1). The lubricating oil ejected by the oil injection assembly sequentially passes through the hollow cavity of the first transmission shaft (1), the hollow cavity of the second transmission shaft (4) and the hollow cavity of the third transmission shaft (5) and flows into the pump housing; A spiral guide groove (8) is arranged on the wall of the hollow cavity of the second transmission shaft (4). The lubricating oil in the hollow cavity of the second transmission shaft (4) flows into the hollow cavity of the third transmission shaft (5) through the spiral guide groove (8); The oil injection assembly includes a lubricating oil spray pipe (2) and an atomizing nozzle (3). The lubricating oil spray pipe (2) and the atomizing nozzle (3) are both placed in the hollow cavity of the first transmission shaft (1). One end of the lubricating oil spray pipe (2) is fixedly connected to the first transmission shaft (1). The other end of the lubricating oil spray pipe (2) is connected to the atomizing nozzle (3), and the atomizing nozzle (3) is arranged on the side close to the second transmission shaft (4); The transmission shaft spline lubrication mechanism further includes an impeller shaft (6). The impeller shaft (6) is placed in the pump housing, and the impeller shaft (6) is connected to the third transmission shaft (5) through a transmission shaft spline.

2. The spline lubrication mechanism of the transmission shaft according to claim 1, wherein The lubricating oil spray pipe (2) is fixedly connected to the first transmission shaft (1) through a shaft end cover (7), and the lubricating oil spray pipe (2) is coaxially arranged with the first transmission shaft (1).

3. The spline lubrication mechanism of the transmission shaft according to claim 2, characterized in that, A gap of 2 mm - 3 mm is left between the wall of the hollow cavity of the first transmission shaft (1) and the lubricating oil spray pipe (2).

4. The spline lubrication mechanism of the transmission shaft according to claim 1, wherein, The hollow cavity of the first transmission shaft (1) is a stepped structure with the axial aperture decreasing sequentially.

5. The spline lubrication mechanism of the transmission shaft according to claim 1, characterized in that, The first transmission shaft (1) is connected to the second transmission shaft (4) through a rectangular spline, and the second transmission shaft (4) is connected to the third transmission shaft (5) through an involute spline.

6. The spline lubrication mechanism of the transmission shaft according to claim 1, characterized in that, The groove width of the spiral guide groove (8) is 8 mm - 12 mm, and the groove depth is 1 mm - 3 mm.

7. The transmission shaft spline lubrication method formed by the transmission shaft spline lubrication mechanism according to claim 1, characterized in that It includes the following steps: The lubricating oil in the lubricating oil spray pipe (2) forms atomized lubricating oil after being ejected by the atomizing nozzle (3). The atomized lubricating oil passes through the hollow cavity of the first transmission shaft (1) and flows into the spiral guide groove (8) in the hollow cavity of the second transmission shaft (4); During the rotation of the second transmission shaft (4), a spiral driving air flow is formed in the spiral guide groove (8). The atomized lubricating oil in the spiral guide groove (8) flows into the hollow cavity of the third transmission shaft (5) under the push of the spiral driving air flow, and passes through the hollow cavity of the third transmission shaft (5) and flows into the pump housing to lubricate the transmission shaft spline in the pump housing.

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