Water-cooled motorized spindle

Abstract

The utility model relates to the technical field of motorized spindles, in particular to a water-cooling motorized spindle, which comprises a casing and a rotating shaft, a front bearing component and a rear bearing component are respectively mounted at the front and the rear of the rotating shaft, a cooling ring cavity is arranged in the wall of the casing, and the front bearing component comprises a front bearing seat, an adapter sleeve, a front bearing and a sealing element. The front bearing assembly comprises a front bearing seat, a front bearing and a sealing piece, a cooling annular cavity is formed in the front bearing seat, a cooling channel communicated with the cooling annular cavity is formed in the front bearing seat, an adapter sleeve is arranged between the front bearing seat and the front bearing, a cooling groove communicated with the cooling channel is formed in the adapter sleeve, and the front bearing and the sealing piece are arranged side by side. And the elastic pre-tightening mechanism is arranged on the front side of the rear bearing. The cooling and elastic pre-tightening mechanism arranged at the front bearing provides axial pre-tightening force for the rear bearing, the contact precision of the rear bearing and the rigidity of the motorized spindle are improved, the performance of the whole motorized spindle can be improved, and the requirement for high-speed and high-precision machining is met.

Description

Technical Field

[0001] The utility model relates to the technical field of electric spindles, in particular to a water-cooled electric spindle. Background Art

[0002] The water-cooled electric spindle is an important component of the machine tool, and its cooling effect directly affects the machining accuracy of the machine tool and the service life of the electric spindle. In order to improve the cooling efficiency of the existing water-cooled electric spindle, it is basically achieved by optimizing the shape and size of the cooling channel, but the role of the bearing in the water-cooled electric spindle is also critical, which directly affects the performance of the entire spindle. It is necessary to consider the cooling of the bearing, and at the same time, the vibration and impact generated during the machining process, so it is necessary to design a water-cooled electric spindle in which the front and rear bearings respectively perform different functions. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a water-cooled electric spindle.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a water-cooled electric spindle, including a housing and a rotating shaft, a rotor assembly and a stator assembly installed in the housing, the front and rear parts of the rotating shaft are respectively installed with a front bearing assembly and a rear bearing assembly, a cooling ring cavity is arranged in the housing wall, the front bearing assembly includes a front bearing seat, a tightening sleeve, a front bearing and a sealing member, the front bearing seat is connected to the front end surface of the housing, and a cooling channel connected to the cooling ring cavity is opened on the front bearing seat, and a cooling channel connected to the cooling ring cavity is arranged between the front bearing seat and the front bearing. The adapter sleeve is provided with a cooling groove connected with the cooling channel, the front bearing and the seal are arranged side by side, and the seal is arranged at the front side of the front bearing, the rear bearing assembly includes a rear bearing seat, a rear bearing and an elastic preload mechanism, the rear bearing seat is installed on the inner wall of the casing near the rear end, the rear bearing and the elastic preload mechanism are arranged side by side, and the elastic preload mechanism is arranged at the front side of the rear bearing, the elastic preload mechanism is provided with a spring seat, a spring and a push block in sequence from back to front, the spring seat is tightly against the rear bearing, and a retaining ring is provided outside the push block.

[0005] Furthermore, a front engine cover is provided at the front end of the front bearing assembly, a cone sleeve is provided on the outside of the front bearing assembly, a waterproof cover is connected to the front end surface of the cone sleeve, and a skeleton oil seal is provided between the waterproof cover and the cone sleeve.

[0006] Furthermore, the rear bearing is a double-row ball bearing, and a rear locking nut is provided on the rear side of the rear bearing.

[0007] Furthermore, a rear water cover is provided at the rear end of the rear bearing assembly.

[0008] Furthermore, a lead through hole is provided on the rear bearing seat.

[0009] Furthermore, the rear end of the housing is connected to a rear cover, a wiring port is provided in the middle of the rear cover, and an aviation connector is connected to the wiring port.

[0010] Furthermore, a water inlet channel and a water outlet channel communicating with the cooling ring cavity are provided on the rear cover, and a water inlet pipe joint and a water outlet pipe joint are connected to the water inlet channel and the water outlet channel respectively.

[0011] Furthermore, the front bearing is a double-row ball bearing with a spacer ring in the middle, and the sealing member includes a first sealing ring and a second sealing ring. The first sealing ring and the second sealing ring have the same structure and are reversely engaged with each other.

[0012] Furthermore, a stepped front locking nut is provided on the rotating shaft on the front side of the sealing element, and the inner side wall of the front engine cover is supported on the stepped surface of the front locking nut.

[0013] The beneficial effects of the utility model are as follows: the utility model provides a cooling channel connected to the cooling ring cavity of the casing on the front bearing seat of the front bearing assembly, and then a cooling groove connected to the cooling channel is opened on the clamping sleeve between the front bearing seat and the front bearing, thereby ensuring the cooling of the front bearing, effectively controlling the temperature rise, reducing the thermal deformation caused by heat, thereby improving the machining accuracy and maintaining the stability of the spindle, and can reduce wear and extend the service life of the front bearing; the elastic preload mechanism gives the rear bearing an axial preload force, improves the bearing contact accuracy and the rigidity of the electric spindle, can improve the performance of the overall electric spindle, and meet the needs of high-speed and high-precision machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at A.

[0017] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure at B.

[0018] In the figure: 1. housing, 11. cooling ring cavity, 2. rotating shaft, 3. rotor assembly, 4. stator assembly, 5. front bearing assembly, 51. front bearing seat, 511. cooling channel, 53. front bearing, 54. sealing element, 541. first sealing ring, 542. second sealing ring, 55. adapter sleeve, 551. cooling groove, 6. rear bearing assembly, 61. rear bearing seat, 611. lead through hole, 62. rear shaft Bearing, 63. Elastic preload mechanism, 631. Spring seat, 632. Spring, 633. Push block, 634. Retaining ring, 7. Front engine cover, 8. Taper sleeve, 9. Waterproof cover, 12. Skeleton oil seal, 13. Front locking nut, 14. Rear locking nut, 15. Rear water cover, 16. Rear cover, 161. Wiring port, 162. Water inlet channel, 163. Water outlet channel, 18. Water inlet pipe joint, 19. Water outlet pipe joint. DETAILED DESCRIPTION

[0019] The present invention is now further described in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0020] like Figures 1 to 3 As shown, a water-cooled electric spindle comprises a housing 1 and a rotating shaft 2, a rotor assembly 3 and a stator assembly 4 installed in the housing 1. A front bearing assembly 5 and a rear bearing assembly 6 are respectively installed at the front and rear of the rotating shaft 2. A cooling annular cavity 11 is arranged in the wall of the housing 1. The front bearing assembly 5 comprises a front bearing seat 51, a tightening sleeve 55, a front bearing 53 and a sealing member 54. The front bearing seat 51 is connected to the front end surface of the housing 1, and a cooling channel 511 communicating with the cooling annular cavity 11 is provided on the front bearing seat 51. An tightening sleeve 55 is provided between the front bearing seat 51 and the front bearing 53. The tightening sleeve 55 is provided with a cooling channel 511 communicating with the cooling annular cavity 11. The cooling groove 551 is connected to the channel 511, the front bearing 53 and the seal 54 are arranged side by side, and the seal 54 is arranged on the front side of the front bearing 53, the rear bearing assembly 6 includes a rear bearing seat 61, a rear bearing 62 and an elastic preload mechanism 63, the rear bearing seat 61 is installed on the inner wall of the casing 1 near the rear end, the rear bearing 62 and the elastic preload mechanism 63 are arranged side by side, and the elastic preload mechanism 63 is arranged on the front side of the rear bearing 62, the elastic preload mechanism 63 is sequentially provided with a spring seat 631, a spring 632 and a push block 633 from back to front, the spring seat 631 is tightly against the rear bearing 62, and a retaining ring 634 is provided outside the push block 633.

[0021] The front end of the front bearing assembly 5 is provided with a front cover 7, the outside of the front bearing assembly 5 is provided with a tapered sleeve 8, the front end surface of the tapered sleeve 8 is connected with a waterproof cover 9, and a skeleton oil seal 12 is provided between the waterproof cover 9 and the tapered sleeve 8. The front bearing 53 is a double-row ball bearing with a spacer ring in the middle, such as Figure 2As shown, the seal 54 includes a first seal ring 541 and a second seal ring 542. The first seal ring 541 and the second seal ring 542 have the same structure and are reversely engaged with each other. A stepped front locking nut 13 is provided on the rotating shaft on the front side of the seal 54, and the inner side wall of the front cover 7 is supported on the stepped surface of the front locking nut 13.

[0022] like Figure 3 As shown, the rear bearing 62 is a double-row ball bearing, and a rear locking nut 14 is provided at the rear side thereof. A rear water cover 15 is provided at the rear end of the rear bearing assembly 6. A lead-in through hole 611 is provided on the rear bearing seat 61.

[0023] The rear end of the housing 1 is connected to the rear cover 16, and a wiring port 161 is provided in the middle of the rear cover 16, and the wiring port 161 is connected to the aviation connector 17. The rear cover 16 is provided with a water inlet channel 162 and a water outlet channel 163 that are connected to the cooling ring cavity 11, and the water inlet channel 162 and the water outlet channel 163 are connected to the water inlet pipe connector 18 and the water outlet pipe connector 19 respectively.

[0024] The water-cooled electric spindle has a cooling channel 511 connected to the cooling ring cavity 11 of the casing 1 on the front bearing seat 51 of the front bearing assembly 5, and a cooling groove 551 connected to the cooling channel 511 is provided on the clamping sleeve 55 between the front bearing seat 51 and the front bearing 53, so as to ensure the cooling of the front bearing 53, effectively control the temperature rise, reduce the thermal deformation caused by heat, thereby improving the processing accuracy and maintaining the stability of the spindle, and can reduce wear and extend the service life of the front bearing 53; the elastic preload mechanism 63 gives the rear bearing 62 an axial preload force, improves the contact accuracy of the rear bearing 62 and the rigidity of the electric spindle, and can improve the performance of the overall electric spindle to meet the needs of high-speed and high-precision processing.

[0025] The above-mentioned implementation mode is only for illustrating the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A water-cooled electric spindle, comprising a housing and a rotating shaft, a rotor assembly and a stator assembly installed in the housing, wherein a front bearing assembly and a rear bearing assembly are installed at the front and rear of the rotating shaft, respectively, and characterized in that: A cooling ring cavity is provided in the casing wall, and the front bearing assembly comprises a front bearing seat, a tightening sleeve, a front bearing and a seal. The front bearing seat is connected to the front end surface of the casing, and the front bearing seat is provided with a cooling channel connected to the cooling ring cavity, a tightening sleeve is provided between the front bearing seat and the front bearing, and the tightening sleeve is provided with a cooling groove connected to the cooling channel, the front bearing and the seal are arranged side by side, and the seal is arranged at the front side of the front bearing, the rear bearing assembly comprises a rear bearing seat, a rear bearing and an elastic preload mechanism, the rear bearing seat is installed on the inner wall of the casing near the rear end, the rear bearing and the elastic preload mechanism are arranged side by side, and the elastic preload mechanism is arranged at the front side of the rear bearing, the elastic preload mechanism is provided with a spring seat, a spring and a push block in sequence from back to front, the spring seat is tightly against the rear bearing, and a retaining ring is provided outside the push block.

2. The water-cooled electric spindle according to claim 1, characterized in that: A front cover is arranged at the front end of the front bearing assembly, a cone sleeve is arranged outside the front bearing assembly, a waterproof cover is connected to the front end surface of the cone sleeve, and a skeleton oil seal is arranged between the waterproof cover and the cone sleeve.

3. The water-cooled electric spindle according to claim 1, characterized in that: The rear bearing is a double-row ball bearing, and a rear locking nut is arranged on the rear side of the rear bearing.

4. The water-cooled electric spindle according to claim 1, characterized in that: A rear water cover is provided at the rear end of the rear bearing assembly.

5. The water-cooled electric spindle according to claim 1, characterized in that: A lead through hole is provided on the rear bearing seat.

6. The water-cooled electric spindle according to claim 1, characterized in that: The rear end of the housing is connected to the rear cover, a wiring port is provided in the middle of the rear cover, and an aviation connector is connected to the wiring port.

7. The water-cooled electric spindle according to claim 6, characterized in that: The rear cover is provided with a water inlet channel and a water outlet channel which are communicated with the cooling ring cavity, and the water inlet channel and the water outlet channel are connected with a water inlet pipe joint and a water outlet pipe joint respectively.

8. The water-cooled electric spindle according to claim 2, characterized in that: The front bearing is a double-row ball bearing with a spacer ring in the middle. The sealing element includes a first sealing ring and a second sealing ring. The first sealing ring and the second sealing ring have the same structure and are reversely buckled with each other.

9. The water-cooled electric spindle according to claim 8, characterized in that: A stepped front locking nut is provided on the rotating shaft at the front side of the sealing element, and the inner side wall of the front engine cover is supported on the stepped surface of the front locking nut.

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