阅读说明：本技术 轴承套、电主轴、机床以及其的安装方法 (Bearing sleeve, electric spindle, machine tool and mounting method thereof ) 是由 王旭 郭霜 李婉 周丹 许甲岿 彭石华 肖威 田家宇 吴小翠 邹小兵 于 2020-03-16 设计创作，主要内容包括：本申请提供种轴承套,包括：轴承套包括在轴向上依次设置的第一轴承室、第二轴承室和第三轴承室；第一轴承室在横截面上的直径为d1；第二轴承室在横截面上的直径为d2；第三轴承室在横截面上的直径为d3；其中d2>d3；d2>d1。根据本申请的轴承套、电主轴、机床以及其的安装方法,能降低轴承装配难度、提高装配精度。(The application provides a bearing housing, includes: the bearing sleeve comprises a first bearing chamber, a second bearing chamber and a third bearing chamber which are sequentially arranged in the axial direction; the first bearing chamber has a diameter d1 in cross-section; the diameter of the second bearing chamber in cross section is d 2; the third bearing chamber has a diameter d3 in cross-section; wherein d2> d 3; d2> d 1. According to the bearing sleeve, the electric spindle, the machine tool and the mounting method of the electric spindle, the bearing assembly difficulty can be reduced, and the assembly precision can be improved.)

1. A bearing housing, comprising: the bearing sleeve comprises a first bearing chamber (1), a second bearing chamber (2) and a third bearing chamber (3) which are sequentially arranged in the axial direction; the diameter of the first bearing chamber (1) in cross section is d 1; the diameter of the second bearing chamber (2) in cross section is d 2; the diameter of the third bearing chamber (3) in cross section is d 3; wherein d2> d 3; d2> d 1.

2. The bearing sleeve as claimed in claim 1, wherein d1 is d 3; and/or d2-d1 with the thickness of 0.08mm or more is 0.04mm or more.

3. Bearing sleeve according to claim 1, characterized in that a first lubrication groove (5) is provided in the bearing sleeve, which first lubrication groove (5) is provided between the first bearing chamber (1) and the second bearing chamber (2); and/or a second lubricating groove (4) is arranged in the bearing sleeve, and the second lubricating groove (4) is arranged between the second bearing chamber (2) and the third bearing chamber (3).

4. Bearing sleeve according to claim 3, characterized in that a first temperature sensor (6) is arranged in the first lubrication groove (5); and/or a second temperature sensor (7) is arranged in the second lubricating groove (4).

5. Bearing sleeve according to claim 4, characterized in that the first lubrication groove (5) is a first annular groove arranged circumferentially around the bearing sleeve centre axis; and/or the second lubricating groove (4) is a second annular groove arranged circumferentially around the central axis of the bearing sleeve; and/or the groove depth h1 of the first lubricating groove (5) is 3-5 mm; and/or the groove width K1 of the first lubricating groove (5) is 3-5 mm; and/or the groove depth h2 of the second lubrication groove (4) is 3-5 mm; and/or the groove width K2 of the second lubricating groove (4) is 3-5 mm.

6. Bearing sleeve according to claim 3, characterized in that the first bearing chamber (1) is provided with a mounting area near the first lubrication groove (5); the inner surface of the mounting area is gradually inclined outwards towards the direction close to the first lubricating groove (5); and/or the third bearing chamber (3) is connected with the second lubricating groove (4) in a chamfering way.

7. The bearing sleeve as claimed in claim 6, characterized in that the inner surface of the mounting region has an angle α with the central axis of the first bearing chamber (1), wherein α ≦ 2 °, and/or the chamfer has an angle β with the central axis of the first bearing chamber (1), wherein β ≦ 135 °.

8. An electric spindle comprising a bearing housing, characterized in that the bearing housing is as claimed in any one of claims 1 to 7.

9. The electric spindle of claim 8, further comprising a first bearing, a second bearing, and a third bearing; the first bearing is installed in a first bearing chamber (1), the second bearing is installed in a second bearing chamber (2), and the third bearing is installed in a third bearing chamber (3).

10. The electric spindle of claim 9, wherein the third bearing has an outer ring diameter d 2.

11. A method of mounting an electric spindle according to any one of claims 8 to 10, comprising the steps of:

-fitting a third bearing into the third bearing chamber (3);

after cooling the second bearing, mounting the second bearing into a second bearing chamber (2);

the third bearing is installed in the third bearing chamber (3).

12. The motorized spindle mounting method according to claim 11, wherein the third bearing is mounted by press fitting, and/or the second bearing is mounted by press fitting, and/or the first bearing is mounted by press fitting, and/or the deformation of the first bearing before and after the cooling is Δ L, wherein Δ L is greater than or equal to d2-d1, and/or the temperature difference before and after the cooling is Δ T, wherein Δ T is 20-50 ℃.

13. A machine tool comprising an electric spindle, characterized in that it is an electric spindle according to any one of claims 8 to 10.

Technical Field

The application belongs to the technical field of machine tools, and particularly relates to a bearing sleeve, an electric spindle, a machine tool and an installation method of the machine tool.

Background

At present, an electric spindle is a new technology for integrating a machine tool spindle and a spindle motor into a whole, the spindle is directly driven by a built-in motor, and the transmission of a gear, a belt or a coupling of a traditional spindle is cancelled, so that the length of a transmission chain of the machine tool spindle is shortened to zero. The electric spindle has a complex structure and has high requirements on the precision and the assembly technology of parts. The bearing combination of the existing electric main shaft structure usually adopts a structure of front 3 and back 1 or front 3 and back 2 to ensure the axial and radial precision of the output end of the main shaft and simultaneously ensure the axial and radial load of the main shaft. The bearing sleeve is positioned at the front end of the main shaft, supports a set of double-row cylindrical roller bearing and two sets of angular contact ball bearings, bears axial load and radial load generated when the main shaft completes surface forming movement, and plays a vital role in a sealing system and a cooling system of the whole shaft system.

However, three sets of bearings are required to be placed in the bearing sleeve, the axial depth is large, large taper can occur, the assembly difficulty of the main shaft is increased, and the assembly precision of the bearing set is reduced.

Therefore, how to provide a bearing sleeve, an electric spindle, a machine tool and a mounting method thereof, which can reduce the assembly difficulty of the bearing and improve the assembly precision, is a problem which needs to be solved by the technical personnel in the field.

Disclosure of Invention

Therefore, the technical problem to be solved by the application is to provide a bearing sleeve, an electric spindle, a machine tool and an installation method thereof, which can reduce the bearing assembly difficulty and improve the assembly precision.

In order to solve the above problem, the present application provides a bearing housing, including: the bearing sleeve comprises a first bearing chamber, a second bearing chamber and a third bearing chamber which are sequentially arranged in the axial direction; the first bearing chamber has a diameter d1 in cross-section; the diameter of the second bearing chamber in cross section is d 2; the third bearing chamber has a diameter d3 in cross-section; wherein d2> d 3; d2> d 1.

Preferably, wherein d1 is ≧ d 3; and/or d2-d1 with the thickness of 0.08mm or more is 0.04mm or more.

Preferably, a first lubrication groove is arranged in the bearing sleeve and is arranged between the first bearing chamber and the second bearing chamber; and/or a second lubricating groove is arranged in the bearing sleeve and is arranged between the second bearing chamber and the third bearing chamber.

Preferably, a first temperature sensor is arranged in the first lubricating groove; and/or a second temperature sensor is arranged in the second lubricating groove.

Preferably, the first lubrication groove is a first annular groove circumferentially disposed about the bearing sleeve central axis; and/or the second lubricating groove is a second annular groove which is circumferentially arranged around the central axis of the bearing sleeve; and/or the groove depth h1 of the first lubricating groove is 3-5 mm; and/or the groove width K1 of the first lubricating groove is 3-5 mm; and/or the groove depth h2 of the second lubricating groove is 3-5 mm; and/or the groove width K2 of the second lubricating groove is 3-5 mm.

Preferably, the first bearing chamber is provided with a mounting area near the first lubrication groove; the inner surface of the mounting area is gradually inclined outwards towards the direction close to the first lubricating groove; and/or the third bearing chamber is connected with the second lubricating groove in a chamfering mode.

Preferably, the inner surface of the mounting region has an angle alpha with the first bearing chamber central axis, wherein alpha is less than or equal to 2 degrees, and/or the chamfer has an angle β with the first bearing chamber central axis, wherein β is less than or equal to 135 degrees.

According to still another aspect of the present application, an electric spindle is provided, which includes a bearing housing, and the bearing housing is the bearing housing described above.

Preferably, the electric spindle further comprises a first bearing, a second bearing and a third bearing; the first bearing is installed in the first bearing chamber, the second bearing is installed in the second bearing chamber, and the third bearing is installed in the third bearing chamber.

Preferably, the outer race diameter of the third bearing is d 2.

According to still another aspect of the present application, there is provided an electric spindle mounting method as described above, including the steps of:

installing the third bearing into the third bearing chamber;

after cooling the second bearing, installing the second bearing into the second bearing chamber;

the third bearing is installed into the third bearing chamber.

Preferably, the third bearing is mounted in a press-fitting mode, and/or the second bearing is mounted in a press-fitting mode, and/or the first bearing is mounted in a press-fitting mode, and/or the deformation of the first bearing before and after cooling is delta L, wherein delta L is larger than or equal to d2-d1, and/or the temperature difference before and after cooling is delta T, wherein delta T is 20-50 ℃.

According to a further aspect of the present application, there is provided a machine tool comprising an electric spindle, the electric spindle being the electric spindle described above.

According to the bearing sleeve, the electric spindle, the machine tool and the mounting method of the electric spindle, the three bearing chambers in the bearing sleeve are arranged to be small at two sides and large in the middle, so that the assembling precision of the spindle can be effectively improved, and the performance of the spindle is further improved.

Drawings

FIG. 1 is a cross-sectional view of a bearing housing of an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a bearing seat according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a bearing seat according to an embodiment of the present application;

FIG. 4 is a cross-sectional view of a bearing housing of an embodiment of the present application;

FIG. 5 is an enlarged view of area B of FIG. 4;

FIG. 6 is an enlarged view of region C of FIG. 4;

FIG. 7 is an enlarged view of area D of FIG. 4;

FIG. 8 is an enlarged view of area E in FIG. 4;

fig. 9 is a schematic structural diagram of a spindle according to an embodiment of the present application.

The reference numerals are represented as:

1. a first bearing chamber; 2. a second bearing chamber; 3. a third bearing chamber; 4. a second lubrication groove; 5. a first lubrication groove; 6. a first temperature sensor; 7. a second temperature sensor; 8. a first through hole; 9. a second via.

Detailed Description

Referring collectively to fig. 1-3, according to an embodiment of the present application, a bearing housing includes: the bearing sleeve comprises a first bearing chamber 1, a second bearing chamber 2 and a third bearing chamber 3 which are sequentially arranged in the axial direction; the diameter of the first bearing chamber 1 in cross section is d 1; the diameter of the second bearing chamber 2 in cross section is d 2; the diameter of the third bearing chamber 3 in cross section is d 3; wherein d2> d 3; d2> d1 sets up three bearing room in the bearing housing as both sides are little, middle big, can avoid among the prior art to place three sets of bearings and lead to the axial degree of depth of bearing room big because of needs, and then the technical problem that great tapering appears, changes the bearing room structure into the three-section in this application, and both sides are little, middle big, can avoid appearing the tapering, and then effectively improves main shaft assembly precision, and then improves the main shaft performance.

Further, d1 is more than or equal to d 3; and/or d2-d1 with the thickness of 0.08mm or more is 0.04mm or more.

With combined reference to fig. 4-5, a first lubrication groove 5 is provided in the bearing housing, the first lubrication groove 5 being provided between the first bearing chamber 1 and the second bearing chamber 2; and/or, be provided with second lubrication groove 4 in the bearing housing, second lubrication groove 4 sets up between second bearing room 2 and third bearing room 3, designs two annular lubrication grooves and can pack lubricating grease into wherein when the assembly, has realized in time constantly supplying lubricating grease to the bearing inside, provides and has prolonged main shaft bearing lubrication time, effectively increases bearing life, improves main shaft operational reliability.

Referring to fig. 4-5 in combination, a first temperature sensor 6 is disposed in the first lubrication groove 5; and/or a second temperature sensor 7 is arranged in the second lubricating groove 4.

Further, the first temperature sensor 6 and the second temperature sensor 7 are both contact temperature sensors.

Furthermore, a first through hole 8 and a second through hole 9 are formed in the side wall of the bearing sleeve, the first temperature sensor 6 and the second temperature sensor 7 are respectively placed into the first lubricating groove 5 and the second lubricating groove 4 of the bearing sleeve through the first through hole 8 and the second through hole 9, and the gap between the sensors and the outer ring of the bearing is extremely small. When the electric spindle runs at a high speed, the bearing has large heat productivity, and because the two contact temperature sensors are immersed in grease and have a small gap with the outer ring of the bearing, the data of monitoring the temperature of the bearing is more accurate, and the monitoring effect of the scheme is obviously better than that of an unmonitored or non-contact temperature sensor.

The process of installing the contact temperature sensor specifically comprises the following steps: the wire of the temperature sensor 6 is connected with the iron wire, the iron wire penetrates into the first through hole 8 from one side of the bearing chamber, and after the bearing chamber is penetrated out from the other side of the first through hole 8, the position is adjusted again to enable the sensor contact to be located in the first lubricating groove 5, then the iron wire is taken out independently, and the assembly of the sensor is achieved. The outer side of the first through hole 8 is blocked by a rubber plug, so that oil leakage cannot be caused. The second temperature sensor 9 is similarly assembled.

Further, the first lubrication groove 5 is a first annular groove provided circumferentially around the bearing sleeve central axis; and/or the second lubricating groove 4 is a second annular groove arranged circumferentially around the central axis of the bearing sleeve; and/or the groove depth h1 of the first lubricating groove 5 is 3-5 mm; and/or the groove width K1 of the first lubrication groove 5 is 3-5 mm; and/or the groove depth h2 of the second lubrication groove 4 is 3-5 mm; and/or the groove width K2 of the second lubrication groove 4 is 3-5 mm. The groove width is the length of the lubricating groove in the axial direction of the shaft sleeve.

Further, the groove depth h1 of the first lubrication groove 5 is 3 mm; and/or the groove width K1 of the first lubrication groove 5 is 3 mm; and/or the groove depth h2 of the second lubricating groove 4 is 3 mm; and/or the groove width K2 of the second lubrication groove 4 is 3 mm.

Further, the first bearing chamber 1 is provided with a mounting area near the first lubrication groove 5; the inner surface of the mounting area is gradually inclined outwards in the direction close to the first lubricating groove 5, so that the mounting area plays a role in guiding the second bearing and avoids the hidden trouble that the second bearing cannot be disassembled; and/or the third bearing chamber 3 is connected with the second lubricating groove 4 in a chamfering mode, so that the third bearing is conveniently loaded into the third bearing chamber 3 in a pressure-bearing mode.

Referring to fig. 6-8, the inner surface of the mounting area has an angle a with the central axis of the first bearing chamber 1, where a is 2 ° or less, and/or the chamfer has an angle β with the central axis of the first bearing chamber 1, where β ° or less, 135 °.

According to an embodiment of the application, the electric spindle comprises a bearing sleeve, and the bearing sleeve is the bearing sleeve.

Further, the electric spindle further comprises a first bearing, a second bearing and a third bearing; the first bearing is mounted in the first bearing chamber 1, the second bearing is mounted in the second bearing chamber 2, and the third bearing is mounted in the third bearing chamber 3.

Further, the outer ring diameter of the third bearing is d 2.

According to an embodiment of the present application, an electric spindle mounting method as described above includes the following steps:

mounting the third bearing in the third bearing chamber 3;

after cooling the second bearing, mounting the second bearing into the second bearing chamber 2;

the third bearing is installed in the third bearing chamber 3, and the angular ball bearing 2 is first pressed into the third bearing chamber 3 by a conventional tool.

The first bearing is a double-row cylindrical roller bearing, and the second bearing and the third bearing are both angular contact ball bearings.

Further, the third bearing is mounted in a press-fitting mode, the second bearing is mounted in a press-fitting mode, and/or the first bearing is mounted in a press-fitting mode, and/or the deformation amount of the first bearing before and after cooling is delta L, wherein delta L is larger than or equal to d2-d1, and/or the temperature difference before and after cooling is delta T, wherein delta T is 20-50 ℃, the third bearing is firstly pressed into the third bearing chamber 3 by using a conventional tool, then the second bearing is cooled, the deformation calculation formula of the material at different temperatures is delta L-d 2- α (T-T0), wherein α is the expansion coefficient of the material, T is the current material temperature, T0 is the original material temperature, the expansion coefficient of the bearing steel is 1.25-10-5, the outer ring of the bearing is cooled to the temperature T, the deformation variable delta L d2-d1 is calculated when the temperature is combined, the bearing steel is assembled, the deformation variable is changed into the second bearing inner ring from delta 7 d2-d1, the bearing inner ring is not easy to be assembled, the second bearing chamber is assembled, the outer ring is assembled, the bearing is assembled into the first bearing chamber, the second bearing chamber is assembled, the bearing is assembled, the outer ring is easily disassembled, the bearing is assembled, and the bearing is assembled, the outer ring is assembled, the bearing is assembled, the first bearing is assembled, the second.

Referring to fig. 9 in combination, according to an embodiment of the present application, an electric spindle includes a bearing housing, where the bearing housing is the bearing housing described above.

According to an embodiment of the application, a machine tool comprises an electric spindle, and the electric spindle is the electric spindle.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.