Oil-immersed spindle assembly for numerical control machine tool

Abstract

The utility model discloses an oil immersion type main shaft assembly for numerical control machine tool, including main shaft body, including main shaft, the middle part of main shaft is sleeved with a double -deck steel cover, and the both sides of main shaft located double -deck steel cover are respectively sleeved with cylindrical roller bearing and angular contact bearing, and the side of main shaft located angular contact bearing away from double -deck steel cover still is sleeved with rear steel cover, and still is equipped with rear gland between angular contact bearing and rear steel cover, and the outside of double -deck steel cover still is equipped with sleeve, and the one end of sleeve extends to rear gland position department, and the other end of sleeve extends to the one end position department of cylindrical roller bearing away from double -deck steel cover. The utility model not only improves the overall sealing, and more makes the utility model can realize the effect that the whole is immersed in oil, and further improves the degree of smoothness to reduce the vibration.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tools, and in particular to an oil-immersed spindle assembly for CNC machine tools. Background Technology

[0002] Most existing CNC machine tool grinding heads are larger in the middle and smaller at both ends, and the lubrication is generally insufficient. This not only easily causes unnecessary mechanical vibration during use, thus affecting the yield rate, but also affects the overall sealing of the spindle due to vibration, further affecting its service life. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, the technical solution adopted by this utility model to solve the technical problem is as follows: An oil-immersed spindle assembly for CNC machine tools is provided, including a spindle body, a spindle, a double-layer steel sleeve fitted in the middle of the spindle, cylindrical roller bearings and angular contact bearings respectively fitted on both sides of the double-layer steel sleeve, a rear steel sleeve fitted on the side of the spindle away from the double-layer steel sleeve where the angular contact bearing is located, a rear pressure cap fitted between the angular contact bearing and the rear steel sleeve, a sleeve fitted on the outer side of the double-layer steel sleeve, one end of the sleeve extending to the position of the rear pressure cap, the other end of the sleeve extending to the position of the cylindrical roller bearing away from the double-layer steel sleeve, an annular step formed at the position of the cylindrical roller bearing on the sleeve, and the annular step extending vertically inward to the position of the spindle. An E-shaped notch is formed on the side wall of the stepped ring away from the cylindrical roller bearing. A convex ring is formed at the position of the main shaft facing the annular step. The outer diameter of the convex ring is the same as the outer diameter of the sleeve. A groove is formed on the side wall of the convex ring facing the annular step to fit the notch. The gap between the groove and the notch is greater than 0.1 mm and less than 1 mm. Bearing oil passages are formed inside the cylindrical roller bearing. The double-layer steel sleeve includes an inner steel sleeve and an outer steel sleeve. Lubricating oil is injected between the inner steel sleeve and the outer steel sleeve. The inner side wall of the inner steel sleeve is in close contact with the outer side wall of the main shaft. The outer side wall of the outer steel sleeve is in close contact with the inner side wall of the sleeve. The difference between the inner diameter of the outer steel sleeve and the outer diameter of the inner steel sleeve is greater than 0.2 mm and less than 1 mm. The outer diameter of the inner steel sleeve and the inner diameter of the outer steel sleeve are aligned with the inner and outer edges of the bearing oil passages, respectively.

[0005] Preferably, the outer wall of the rear cover is formed with multiple annular guide grooves, and the inner wall of the sleeve located near the rear cover is also formed with multiple annular guide grooves.

[0006] Preferably, a groove is formed on the side wall of the rear cover facing the rear steel sleeve, and a flange that matches the groove is formed on the side wall of the rear steel sleeve facing the rear cover.

[0007] Preferably, there are two cylindrical roller bearings and two angular contact bearings.

[0008] Preferably, a pulley is also fixedly fitted to the end of the main shaft located away from the double-layer steel sleeve at the rear steel sleeve.

[0009] Preferably, a spindle nut is also fixedly installed on the side of the spindle away from the rear steel sleeve.

[0010] Preferably, the main shaft has a nut fixing key formed on the side of the pulley near the rear steel sleeve.

[0011] Preferably, the end face of the spindle located away from the pulley is also formed with mounting holes.

[0012] Preferably, an oil passage washer is fitted on the side of the main shaft near the cylindrical roller bearing on the annular step, and a washer step is formed on the side of the main shaft away from the cylindrical roller bearing on the side of the oil passage washer. One side of the oil passage washer is in close contact with the cylindrical roller bearing, and the other side is in close contact with the washer step. The difference between the outer diameter of the oil passage washer and the outer edge of the bearing oil passage is greater than 0.2 mm and less than 1 mm.

[0013] The beneficial effects of this utility model are as follows: This utility model adopts the setting that the spindle and the sleeve have the same diameter, so that the front and rear diameters of the entire spindle assembly are consistent, thus making it suitable for various CNC machine tools. Furthermore, since the bayonet and slot, the bearing oil circuit and the double-layer steel sleeve and the oil circuit gasket form a slender passage, it not only improves the overall sealing performance, but also enables this utility model to achieve the effect of being completely wetted by oil, further improving the degree of compliance and thus reducing vibration. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the present invention.

[0015] In the diagram: 1. Sleeve; 2. Convex ring; 3. Rear cover; 4. Rear steel sleeve; 5. Pulley; 6. Main shaft nut; 7. Nut retaining key; 8. Cylindrical roller bearing; 9. Angular contact bearing; 10. Inner steel sleeve; 11. Outer steel sleeve; 12. Oil passage washer; 13. Main shaft. Detailed Implementation

[0016] The present invention will be further described below with reference to embodiments, but is not limited to the contents of the specification.

[0017] Example 1: As Figure 1 As shown, the present invention aims to at least solve one of the technical problems existing in the prior art.

[0018] Therefore, the technical solution adopted by this utility model to solve the technical problem is: an oil-immersed spindle 13 assembly for CNC machine tools, including a spindle 13 body, a double-layer steel sleeve fitted in the middle of the spindle 13, cylindrical roller bearings 8 and angular contact bearings 9 respectively fitted on both sides of the double-layer steel sleeve, a rear steel sleeve 4 fitted on the side of the spindle 13 away from the double-layer steel sleeve of the angular contact bearing 9, a rear pressure cover 3 fitted between the angular contact bearing 9 and the rear steel sleeve 4, a sleeve 1 fitted on the outer side of the double-layer steel sleeve, one end of the sleeve 1 extending to the position of the rear pressure cover 3, the other end of the sleeve 1 extending to the position of the cylindrical roller bearing 8 away from the double-layer steel sleeve, an annular step formed at the position of the cylindrical roller bearing 8 of the sleeve 1, and the annular step extending vertically inward to the position of the spindle 13. An E-shaped notch is formed on the side wall away from the cylindrical roller bearing 8. A convex ring 2 is formed at the position of the main shaft 13 facing the annular step. The outer diameter of the convex ring 2 is the same as the outer diameter of the sleeve 1. A groove is formed on the side wall of the convex ring 2 facing the annular step to fit the notch. The gap between the groove and the notch is greater than 0.1 mm and less than 1 mm. A bearing oil passage is formed inside the cylindrical roller bearing 8. The double-layer steel sleeve includes an inner steel sleeve 10 and an outer steel sleeve 11. Lubricating oil is injected between the inner steel sleeve 10 and the outer steel sleeve 11. The inner side wall of the inner steel sleeve 10 is close to the outer side wall of the main shaft 13. The outer side wall of the outer steel sleeve 11 is close to the inner side wall of the sleeve 1. The difference between the inner diameter of the outer steel sleeve 11 and the outer diameter of the inner steel sleeve 10 is greater than 0.2 mm and less than 1 mm. The outer diameters of the inner steel sleeve 10 and the outer steel sleeve 11 are aligned with the inner and outer edges of the bearing oil passage, respectively.

[0019] Multiple annular guide grooves are formed on the outer side wall of the rear cover 3, and multiple annular guide grooves are also formed on the inner side wall of the sleeve 1 located near the rear cover 3.

[0020] A groove is formed on the side wall of the rear pressure cover 3 facing the rear steel sleeve 4, and a flange that matches the groove is formed on the side wall of the rear steel sleeve 4 facing the rear pressure cover 3.

[0021] There are two cylindrical roller bearings 8 and two angular contact bearings 9.

[0022] The main shaft 13 is located at the end of the rear steel sleeve 4 away from the double-layer steel sleeve and is also fixedly sleeved with a pulley 5.

[0023] The main shaft 13 is located on the side of the pulley 5 away from the rear steel sleeve 4 and is also fixedly installed with a main shaft nut 6.

[0024] The main shaft 13 is located on the side of the pulley 5 near the rear steel sleeve 4 and also has a nut fixing key 7 formed thereon.

[0025] The end face of the spindle 13 located away from the pulley 5 also has a mounting hole formed.

[0026] The main shaft 13 is fitted with an oil passage washer 12 on the side of the annular step near the cylindrical roller bearing 8. The main shaft 13 is also fitted with a washer step on the side of the oil passage washer 12 away from the cylindrical roller bearing 8. One side of the oil passage washer 12 is in close contact with the cylindrical roller bearing 8 and the other side is in close contact with the washer step. The difference between the outer diameter of the oil passage washer 12 and the outer edge of the bearing oil passage is greater than 0.2 mm and less than 1 mm.

[0027] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the embodiments of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is impossible to exhaustively list all embodiments here. All obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. An oil-immersed spindle assembly for CNC machine tools, comprising a spindle body, characterized in that: The device includes a main shaft, with a double-layered steel sleeve fitted at its center. Cylindrical roller bearings and angular contact bearings are respectively fitted on either side of the double-layered steel sleeve. A rear steel sleeve is also fitted on the side of the main shaft away from the double-layered steel sleeve, opposite the angular contact bearings. A rear pressure cap is fitted between the angular contact bearings and the rear steel sleeve. A sleeve is fitted on the outer side of the double-layered steel sleeve, with one end extending to the rear pressure cap and the other end extending to the end of the cylindrical roller bearing away from the double-layered steel sleeve. An annular step is formed at the location of the cylindrical roller bearing on the sleeve, extending vertically inward to the main shaft. A cross-section with an E-shape is formed on the sidewall of the annular step away from the cylindrical roller bearing. The main shaft has a U-shaped bayonet with a protruding ring formed at the position facing the annular step. The outer diameter of the protruding ring is the same as the outer diameter of the sleeve. A groove is formed on the side wall of the protruding ring facing the annular step to fit the bayonet. The gap between the groove and the bayonet is greater than 0.1 mm and less than 1 mm. The cylindrical roller bearing has a bearing oil passage formed inside. The double-layer steel sleeve includes an inner steel sleeve and an outer steel sleeve. Lubricating oil is injected between the inner and outer steel sleeves. The inner sidewall of the inner steel sleeve is in close contact with the outer sidewall of the main shaft, and the outer sidewall of the outer steel sleeve is in close contact with the inner sidewall of the sleeve. The difference between the inner diameter of the outer steel sleeve and the outer diameter of the inner steel sleeve is greater than 0.2 mm and less than 1 mm. The outer diameters of the inner and outer steel sleeves are aligned with the inner and outer edges of the bearing oil passage, respectively.

2. The oil-immersed spindle assembly for CNC machine tools according to claim 1, characterized in that: Multiple annular guide grooves are formed on the outer wall of the rear pressure cover, and multiple annular guide grooves are also formed on the inner wall of the sleeve located near the rear pressure cover.

3. The oil-immersed spindle assembly for CNC machine tools according to claim 2, characterized in that: A groove is formed on the side wall of the rear pressure cover facing the rear steel sleeve, and a flange that matches the groove is formed on the side wall of the rear steel sleeve facing the rear pressure cover.

4. The oil-immersed spindle assembly for CNC machine tools according to claim 1, characterized in that: There are two cylindrical roller bearings and two angular contact bearings.

5. The oil-immersed spindle assembly for CNC machine tools according to claim 1, characterized in that: The main shaft is located at the end of the rear steel sleeve away from the double-layer steel sleeve and is also fixedly fitted with a pulley.

6. The oil-immersed spindle assembly for CNC machine tools according to claim 5, characterized in that: The main shaft is located on the side of the pulley away from the rear steel sleeve and is also fixedly installed with a main shaft nut.

7. The oil-immersed spindle assembly for CNC machine tools according to claim 6, characterized in that: The main shaft is located on the side of the pulley near the rear steel sleeve and is also formed with a nut fixing key.

8. The oil-immersed spindle assembly for CNC machine tools according to claim 5, characterized in that: The spindle also has mounting holes formed on its end face at the end furthest from the pulley.

9. The oil-immersed spindle assembly for CNC machine tools according to claim 5, characterized in that: The main shaft is fitted with an oil passage gasket on the side of the annular step near the cylindrical roller bearing. The main shaft is also fitted with a gasket step on the side of the oil passage gasket away from the cylindrical roller bearing. One side of the oil passage gasket is in close contact with the cylindrical roller bearing, and the other side is in close contact with the gasket step. The difference between the outer diameter of the oil passage gasket and the outer edge of the bearing oil passage is greater than 0.2 mm and less than 1 mm.

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