Axial positioning structure for motor rotor shaft

Abstract

The present invention provides an axial positioning structure for a motor rotor shaft. The axial positioning structure for a motor rotor shaft comprises: a motor housing, a front blocking plate, a rear blocking plate and a rotor shaft, wherein the rotor shaft passes through the motor housing, the front blocking plate and the rear blocking plate and is rotatably connected to the front blocking plate and the rear blocking plate, and an axial positioning structure is provided on the front blocking plate, wherein the axial positioning structure is used for axial positioning of the rotor shaft so that the rotor shaft does not move axially in the axial direction. The axial positioning structure for a motor rotor shaft provided by the present invention realizes axial positioning of the rotor shaft by providing the axial positioning structure so that the rotor shaft does not move axially in the axial direction.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an axial positioning structure for a motor rotor shaft. Background Art

[0002] As a power device that converts electrical energy into mechanical energy, the motor has been widely used in social production. It mainly uses the energized coil (that is, the stator winding) to generate a rotating magnetic field and act on the rotor (armature core) to form a magnetic electrodynamic rotating torque. The performance of the motor rotor directly affects the overall performance of the motor.

[0003] At present, most motor rotor shafts are fixed on the motor housing with two bearings. During use, the motor often starts or stops or accelerates or decelerates, which will cause wear between the rotor shaft and the inner ring of the bearing. At the same time, the outer ring of the bearing will also move due to factors such as motor vibration. The above two factors will cause the rotor shaft to move in the axial direction, which is not conducive to the stable use of the motor.

[0004] Therefore, it is necessary to provide an axial positioning structure for the motor rotor shaft to solve the above technical problems. Summary of the invention

[0005] The technical problem solved by the present invention is to provide an axial positioning structure for a motor rotor shaft.

[0006] In order to solve the above technical problems, the present invention provides an axial positioning structure for a motor rotor shaft, comprising: a motor housing, a front sealing plate, a rear sealing plate and a rotor shaft, the rotor shaft passes through the motor housing, the front sealing plate and the rear sealing plate and is rotatably connected to the front sealing plate and the rear sealing plate, an axial positioning structure is provided on the front sealing plate, and the axial positioning structure is used for axially positioning the rotor shaft so that the rotor shaft does not move axially in the axial direction.

[0007] Preferably, the axial positioning structure includes a mounting groove, which is arranged on a side of the front sealing plate away from the motor housing, and the rotor shaft passes through the mounting groove. A semi-annular groove is arranged on the outer ring of the rotor shaft, and a plurality of balls are movably installed in the semi-annular groove. An annular pressure block is installed in the mounting groove, and an arc groove is arranged on a side of the annular pressure block close to the inner ring, and the arc groove is adapted to the plurality of balls. Under the action of the semi-annular groove and the arc groove, the plurality of balls are in close contact with the arc groove and the semi-annular groove.

[0008] Preferably, an oil filling hole is provided on the annular pressure block, and the oil filling hole is connected to the mounting groove. An oil filling nozzle is installed at one end of the oil filling hole. The oil filling nozzle and the oil filling hole are used to inject high-temperature resistant oil into the mounting groove, so that the high-temperature resistant oil adheres to the multiple balls, thereby increasing the lubrication and high-temperature resistance of the balls.

[0009] Preferably, a first sealing ring is installed between the rotor shaft and the front sealing plate, and the first sealing ring is used to prevent the high temperature resistant oil in the installation groove from entering the motor housing.

[0010] Preferably, a second sealing ring is installed between the rotor shaft and the annular pressing block, and a third sealing ring is installed between the mounting groove and the annular pressing block, and the second sealing ring and the third sealing ring are both used to prevent the high temperature resistant oil in the mounting groove from overflowing outside the motor.

[0011] Preferably, a first bearing groove is opened on the side of the front sealing plate close to the motor housing, a first bearing is installed in the first bearing groove, the outer ring of the first bearing is interference fit in the first bearing groove, the inner ring of the first bearing is interference fit with the rotor shaft, and the first bearing is used to support and fix the rotor shaft.

[0012] Preferably, an annular baffle is fixedly mounted on one side of the front blocking plate close to the motor housing, and the annular baffle is used to block the first bearing so that the first bearing does not move out of the first bearing groove.

[0013] Preferably, a second bearing groove is formed on a side of the rear sealing plate away from the motor housing, the rotor shaft passes through the second bearing groove, a second bearing is interference-fitted in the second bearing groove, and an inner ring of the second bearing is interference-fitted with the rotor shaft.

[0014] Preferably, a protective cover is provided on the side of the rear sealing plate away from the motor housing, and an annular thread groove is opened on the side of the rear sealing plate away from the motor housing. The protective cover is threadedly connected to the annular thread groove, and an annular tube is fixedly installed on the inner wall of one side of the protective cover, and one side of the annular tube is in close contact with the outer ring of the second bearing.

[0015] Preferably, a sealing gasket is fixedly installed in the annular thread groove, and the sealing gasket is in close contact with the protective cover. The sealing gasket is used to prevent air and water vapor outside the motor from entering the interior of the motor housing through the annular thread groove.

[0016] Compared with the related art, the axial positioning structure for the motor rotor shaft provided by the present invention has the following beneficial effects:

[0017] (1) The axial positioning structure is provided to realize the axial positioning of the rotor shaft, so that the rotor shaft will not move axially.

[0018] (2) By providing an oiling nozzle and an oiling hole, high temperature resistant oil can be attached to the ball, thereby increasing the lubrication and high temperature resistance of the ball.

[0019] (3) The setting of the baffle can effectively block the first bearing in the first bearing groove, ensuring that the first bearing plays a supporting and fixing role for the rotor shaft.

[0020] (4) Under the action of the protective cover, the annular tube can tightly press the second bearing into the second bearing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic cross-sectional view of an axial positioning structure for a motor rotor shaft provided by the present invention;

[0022] Figure 2 for Figure 1 A magnified view of part A;

[0023] Figure 3 for Figure 2 A magnified view of part B;

[0024] Figure 4 for Figure 1 Magnified view of part C.

[0025] Numbers in the figure: 1, motor housing, 2, front sealing plate, 3, rear sealing plate, 4, rotor shaft, 5, mounting groove, 6, semi-annular groove, 7, ball, 8, annular pressure block, 9, arc groove, 10, oil filling hole, 11, oil filling nozzle, 12, first sealing ring, 13, second sealing ring, 14, first bearing groove, 15, first bearing, 16, annular baffle, 17, second bearing groove, 18, second bearing, 19, protective cover, 20, annular tube, 21, annular threaded groove, 22, sealing gasket, 23, third sealing ring. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0027] like Figure 1 As shown, an axial positioning structure for a motor rotor shaft comprises: a motor casing 1, a front blocking plate 2, a rear blocking plate 3 and a rotor shaft 4, wherein the front blocking plate 2 and the rear blocking plate 3 are fixedly connected to the motor casing 1 by a plurality of bolts, the rotor shaft 4 passes through the motor casing 1, the front blocking plate 2 and the rear blocking plate 3 and are rotatably connected to the front blocking plate 2 and the rear blocking plate 3, the rotor shaft 4 can rotate when power is supplied, and an axial positioning structure is provided on the front blocking plate 2, the axial positioning structure being used for axially positioning the rotor shaft 4 so that the rotor shaft 4 does not move axially in the axial direction.

[0028] like Figure 2-3 As shown, the axial positioning structure includes a mounting groove 5, which is provided on a side of the front blocking plate 2 away from the motor housing 1, the rotor shaft 4 passes through the mounting groove 5, and a semi-annular groove 6 is provided on the outer ring of the rotor shaft 4, and a plurality of balls 7 are movably installed in the semi-annular groove 6, and the plurality of balls 7 can rotate in the semi-annular groove 6 to ensure the normal rotation of the rotor shaft 4. At the same time, the plurality of balls 7 can limit the axial movement of the rotor shaft 4, and an annular pressing block 8 is installed in the mounting groove 5, and an arc groove 9 is provided on a side of the annular pressing block 8 close to the inner ring, and the arc groove 9 is adapted to the plurality of balls 7. It is precisely because the balls 7 limit the rotor shaft 4 under the action of the arc groove 9 that the rotor shaft 4 is restricted. Under the action of the semi-annular groove 6 and the arc groove 9, the plurality of balls 7 are in close contact with the arc groove 9 and the semi-annular groove 6, so that the activity space of the balls 7 is extremely small, thereby ensuring that the rotor shaft 4 does not move axially in the axial direction.

[0029] like Figure 3 As shown, an oil filling hole 10 is opened on the annular pressure block 8, and the oil filling hole 10 is connected with the mounting groove 5. An oil filling nozzle 11 is installed at one end of the oil filling hole 10, and the oil filling nozzle 11 and the oil filling hole 10 are used to inject high-temperature resistant oil into the mounting groove 5. When the rotor shaft 4 rotates at a high speed, the ball 7 will also rotate. The rotation of the ball 7 will have a certain friction and generate high temperature. In this case, the injected high-temperature resistant oil adheres to the multiple balls 7, thereby increasing the lubrication and high-temperature resistance of the balls 7.

[0030] like Figure 3 As shown, a first sealing ring 12 is installed between the rotor shaft 4 and the front sealing plate 2 , and the first sealing ring 12 is used to prevent the high temperature resistant oil in the installation groove 5 from entering the motor housing 1 .

[0031] Furthermore, a second sealing ring 13 is installed between the rotor shaft 4 and the annular pressure block 8, and a third sealing ring 23 is installed between the mounting groove 5 and the annular pressure block 8. The second sealing ring 13 and the third sealing ring 23 are both used to prevent the high temperature resistant oil in the mounting groove 5 from overflowing outside the motor.

[0032] By arranging the first sealing ring 12, the second sealing ring 13 and the third sealing ring 23 in cooperation, it can be ensured that the high-temperature oil is stored in the mounting groove 5, thereby ensuring the lubrication and cooling of the ball 7, and at the same time, preventing the outside air and water vapor from entering the interior of the motor housing 1.

[0033] like Figure 2As shown, a first bearing groove 14 is opened on one side of the front blocking plate 2 close to the motor housing 1, and a first bearing 15 is installed in the first bearing groove 14. The outer ring of the first bearing 15 is interference-fitted in the first bearing groove 14, and the inner ring of the first bearing 15 is interference-fitted with the rotor shaft 4. The first bearing 15 is used to support and fix the rotor shaft 4. When the rotor shaft 4 rotates at high speed, the bearing fit is required to reduce the resistance of the rotor shaft 4 when it rotates.

[0034] like Figure 2 As shown, an annular baffle 16 is fixedly installed on one side of the front blocking plate 2 close to the motor housing 1, and the annular baffle 16 is used to block the first bearing 15 so that the first bearing 15 will not move out of the first bearing groove 14. The first bearing 15 is capable of moving in the first bearing groove 14. The setting of the annular baffle 16 can effectively block the first bearing 15 in the first bearing groove 14, thereby ensuring that the first bearing 15 supports and fixes the rotor shaft 4. When the rotor shaft 4 rotates at high speed, bearing cooperation is required to reduce the resistance of the rotor shaft 4 during rotation.

[0035] like Figure 4 As shown, a second bearing groove 17 is opened on the side of the rear sealing plate 3 away from the motor housing 1, and the rotor shaft 4 passes through the second bearing groove 17. A second bearing 18 is interference-fitted in the second bearing groove 17. The inner ring of the second bearing 18 is interference-fitted with the rotor shaft 4, and the second bearing 18 plays a role of fixing and supporting the rotor shaft 4.

[0036] like Figure 4 As shown, a protective cover 19 is provided on the side of the rear sealing plate 3 away from the motor housing 1, and an annular thread groove 21 is opened on the side of the rear sealing plate 3 away from the motor housing 1. The protective cover 19 is threadedly connected to the annular thread groove 21. The protective cover 19 can isolate one end of the rotor shaft 4 to prevent people from touching the high-speed rotating rotor shaft 4. An annular tube 20 is fixedly installed on the inner wall of one side of the protective cover 19, and one side of the annular tube 20 is in close contact with the outer ring of the second bearing 18. Under the action of the protective cover 19, the annular tube 20 can tightly press the second bearing 18 against the second bearing groove 17.

[0037] like Figure 4 As shown, a sealing gasket 22 is fixedly installed in the annular thread groove 21 . The sealing gasket 22 is in close contact with the protective cover 19 . The sealing gasket 22 is used to prevent air and water vapor outside the motor from entering the motor housing 1 through the annular thread groove 21 .

[0038] The working principle of the axial positioning structure for the motor rotor shaft provided by the present invention is as follows:

[0039] When the rotor shaft 4 rotates, the multiple balls 7 will rotate. Under the action of the annular pressing block 8 and the arc groove 9, the balls 7 limit the semi-annular groove 6, so that the rotor shaft 4 will not move axially.

[0040] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An axial positioning structure for a motor rotor shaft, characterized in that: include: A motor housing, a front blocking plate, a rear blocking plate and a rotor shaft, wherein the rotor shaft penetrates the motor housing, the front blocking plate and the rear blocking plate and is rotatably connected to the front blocking plate and the rear blocking plate, and an axial positioning structure is provided on the front blocking plate, wherein the axial positioning structure is used for axially positioning the rotor shaft so that the rotor shaft does not move axially in the axial direction; The axial positioning structure comprises a mounting groove, wherein the mounting groove is provided on a side of the front blocking plate away from the motor housing, the rotor shaft passes through the mounting groove, a semi-annular groove is provided on the outer ring of the rotor shaft, a plurality of balls are movably installed in the semi-annular groove, an annular pressing block is installed in the mounting groove, an arc groove is provided on a side of the annular pressing block close to the inner ring, the arc groove is adapted to the plurality of balls, and under the action of the semi-annular groove and the arc groove, the plurality of balls are in close contact with the arc groove and the semi-annular groove; A first bearing groove is provided on one side of the front sealing plate close to the motor housing, a first bearing is installed in the first bearing groove, an outer ring of the first bearing is interference fit in the first bearing groove, an inner ring of the first bearing is interference fit with the rotor shaft, and the first bearing is used to support and fix the rotor shaft.

2. The axial positioning structure for the motor rotor shaft according to claim 1, characterized in that: An oil filling hole is provided on the annular pressure block, and the oil filling hole is connected to the mounting groove. An oil filling nozzle is installed at one end of the oil filling hole. The oil filling nozzle and the oil filling hole are used to inject high-temperature resistant oil into the mounting groove, so that the high-temperature resistant oil adheres to the multiple balls, thereby increasing the lubrication and high-temperature resistance of the balls.

3. The axial positioning structure for the motor rotor shaft according to claim 1, characterized in that: A first sealing ring is installed between the rotor shaft and the front sealing plate, and the first sealing ring is used to prevent the high temperature resistant oil in the installation groove from entering the motor housing.

4. The axial positioning structure for a motor rotor shaft according to claim 1, characterized in that: A second sealing ring is installed between the rotor shaft and the annular pressing block, and a third sealing ring is installed between the mounting groove and the annular pressing block. The second sealing ring and the third sealing ring are both used to prevent the high temperature resistant oil in the mounting groove from overflowing outside the motor.

5. The axial positioning structure for a motor rotor shaft according to claim 1, characterized in that: An annular baffle is fixedly mounted on one side of the front blocking plate close to the motor housing, and the annular baffle is used to block the first bearing so that the first bearing will not move out of the first bearing groove.

6. The axial positioning structure for a motor rotor shaft according to claim 1, characterized in that: A second bearing groove is formed on a side of the rear sealing plate away from the motor housing, the rotor shaft passes through the second bearing groove, a second bearing is interference-fitted in the second bearing groove, and an inner ring of the second bearing is interference-fitted with the rotor shaft.

7. The axial positioning structure for the motor rotor shaft according to claim 6, characterized in that: A protective cover is provided on the side of the rear sealing plate away from the motor housing, and an annular thread groove is opened on the side of the rear sealing plate away from the motor housing. The protective cover is threadedly connected to the annular thread groove, and an annular tube is fixedly installed on the inner wall of one side of the protective cover, and one side of the annular tube is in close contact with the outer ring of the second bearing.

8. The axial positioning structure for the motor rotor shaft according to claim 7, characterized in that: A sealing gasket is fixedly installed in the annular thread groove, and the sealing gasket is in close contact with the protective cover. The sealing gasket is used to prevent air and water vapor outside the motor from entering the interior of the motor housing through the annular thread groove.

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