阅读说明：本技术 一种电主轴前轴承结构和电主轴 (Front bearing structure of electric spindle and electric spindle ) 是由 梁桂转 汤丽君 汤秀清 于 2021-01-29 设计创作，主要内容包括：本发明公开了一种电主轴前轴承结构和电主轴,包括：机体组件,设有轴向内孔,轴向内孔的前端设有前轴承座；轴芯组件,前端通过前轴承支承于前轴承座；前轴承座包括嵌入轴向内孔的嵌入段,前轴承座的前端设有前端盖,前轴承座设有冷却水道,冷却水道包括：多个第一腰型水道,设置于嵌入段的外侧面,并沿周向间隔分布,第一腰型水道与轴向内孔匹配贴合；多个第二腰型水道,设置于前轴承座的前端面,并沿周向与第一腰型水道交错分布,第二腰型水道与前端盖匹配贴合；多个轴向水道,连接于交错分布的第一腰型水道和第二腰型水道之间,第一腰型水道、轴向水道和第二腰型水道形成围绕前轴承的冷却水道。使得前轴承的散热面积大大增大,冷却效果显著。(The invention discloses an electric spindle front bearing structure and an electric spindle, comprising: the engine body assembly is provided with an axial inner hole, and the front end of the axial inner hole is provided with a front bearing seat; the front end of the shaft core assembly is supported on the front bearing seat through a front bearing; the front bearing seat is equipped with the front end housing including the embedding section of embedding axial hole, the front end of front bearing seat, and the front bearing seat is equipped with the cooling water course, and the cooling water course includes: the first waist-shaped water channels are arranged on the outer side surface of the embedding section and are distributed at intervals along the circumferential direction, and the first waist-shaped water channels are matched and attached with the axial inner holes; the second waist-shaped water channels are arranged on the front end face of the front bearing seat and are distributed with the first waist-shaped water channels in a staggered manner along the circumferential direction, and the second waist-shaped water channels are matched and attached with the front end cover; and the plurality of axial water channels are connected between the first waist-shaped water channels and the second waist-shaped water channels which are distributed in a staggered manner, and the first waist-shaped water channels, the axial water channels and the second waist-shaped water channels form cooling water channels surrounding the front bearing. The heat dissipation area of the front bearing is greatly increased, and the cooling effect is obvious.)

1. An electric spindle front bearing structure, comprising:

the engine body assembly is provided with an axial inner hole, and a front bearing seat is arranged at the front end of the axial inner hole;

the shaft core assembly is arranged in the axial inner hole, and the front end of the shaft core assembly is supported on the front bearing seat through a front bearing;

wherein, the front bearing seat is including the embedding section of axial hole, the front end of front bearing seat is equipped with the front end housing, the front bearing seat is equipped with the cooling water course, the cooling water course includes:

the first waist-shaped water channels are arranged on the outer side surface of the embedded section and are distributed at intervals along the circumferential direction, and the first waist-shaped water channels are matched and attached with the axial inner holes;

the second waist-shaped water channels are arranged on the front end face of the front bearing seat and are distributed with the first waist-shaped water channels in a staggered manner along the circumferential direction, and the second waist-shaped water channels are matched and attached to the front end cover;

and the plurality of axial water channels are connected between the first waist-shaped water channels and the second waist-shaped water channels which are distributed in a staggered manner, and the first waist-shaped water channels, the axial water channels and the second waist-shaped water channels form cooling water channels surrounding the front bearing.

2. The front bearing structure of electric spindle according to claim 1, wherein the body assembly is provided with a water inlet and a water outlet, the water inlet and the water outlet are distributed opposite to each other on both sides of the embedded section, the first waist-shaped water channel includes a water inlet side first waist-shaped water channel abutting against the water inlet and a water outlet side first waist-shaped water channel abutting against the water outlet, the cold medium entering from the water inlet flows along the water inlet side first waist-shaped water channel to both sides, and the cold medium circulates in half circles, collects in the water outlet side first waist-shaped water channel, and flows out through the water outlet.

3. The electric spindle front bearing structure according to claim 1, wherein radial holes communicating with the axial water passage are opened at both ends of the first kidney-shaped water passage.

4. The front bearing structure of an electric spindle according to claim 1, wherein the embedding section is provided with first seal ring mounting ring grooves at front and rear sides of the first kidney-shaped water passage, and first seal rings are provided in the first seal ring mounting ring grooves.

5. The front bearing structure of an electric spindle according to claim 1, wherein a second ring-mounting groove is formed in an outer periphery of the second kidney-shaped water passage, and a second ring is disposed in the second ring-mounting groove.

6. An electric spindle comprising the electric spindle front bearing structure according to any one of claims 1 to 5.

Technical Field

The invention is used in the field of turning and boring, and particularly relates to a front bearing structure of an electric spindle and the electric spindle.

Background

The machining center spindle needs to provide large cutting force and large bearing capacity, so that the design requirement of the motor is high power and large torque, the high power motor inevitably generates large heat, the heat is transferred to the front bearing and the rear bearing, the heat generated by the bearings is increased, and particularly the front bearing of the spindle is higher than the heat generated by the operation of the front bearing than the rear bearing. The common electric main shaft is a simple annular groove for cooling the front bearing, and has small heat dissipation area and poor cooling effect.

Disclosure of Invention

The present invention is directed to at least one of the technical problems of the prior art, and provides a front bearing structure of an electric spindle and an electric spindle.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in a first aspect, an electric spindle front bearing structure includes:

the engine body assembly is provided with an axial inner hole, and a front bearing seat is arranged at the front end of the axial inner hole;

the shaft core assembly is arranged in the axial inner hole, and the front end of the shaft core assembly is supported on the front bearing seat through a front bearing;

wherein, the front bearing seat is including the embedding section of axial hole, the front end of front bearing seat is equipped with the front end housing, the front bearing seat is equipped with the cooling water course, the cooling water course includes:

the first waist-shaped water channels are arranged on the outer side surface of the embedded section and are distributed at intervals along the circumferential direction, and the first waist-shaped water channels are matched and attached with the axial inner holes;

the second waist-shaped water channels are arranged on the front end face of the front bearing seat and are distributed with the first waist-shaped water channels in a staggered manner along the circumferential direction, and the second waist-shaped water channels are matched and attached to the front end cover;

and the plurality of axial water channels are connected between the first waist-shaped water channels and the second waist-shaped water channels which are distributed in a staggered manner, and the first waist-shaped water channels, the axial water channels and the second waist-shaped water channels form cooling water channels surrounding the front bearing.

With reference to the first aspect, in certain implementations of the first aspect, the machine body assembly is provided with a water inlet and a water outlet, the water inlet and the water outlet are located on two sides of the embedding section and are distributed right opposite to each other, the first waist-shaped water channel includes a first waist-shaped water channel on a water inlet side and a first waist-shaped water channel on a water outlet side, the first waist-shaped water channel is in butt joint with the water inlet, a cold medium entering from the water inlet flows to two sides along the first waist-shaped water channel on the water inlet side, and each circulation half loop is converged on the first waist-shaped water channel on the water outlet side and flows out through the water outlet.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, radial holes communicated with the axial water passage are formed at two ends of the first kidney-shaped water passage.

With reference to the first aspect and the foregoing implementation manners, in some implementation manners of the first aspect, first seal ring installation ring grooves are formed in the front side and the rear side of the first kidney-shaped water channel of the embedding section, and first seal rings are arranged in the first seal ring installation ring grooves.

With reference to the first aspect and the foregoing implementation manners, in certain implementation manners of the first aspect, a second seal ring mounting ring groove is formed in the periphery of the second kidney-shaped water channel, and a second seal ring is arranged in the second seal ring mounting ring groove.

In a second aspect, an electric spindle includes the electric spindle front bearing structure described in any one of the implementations of the first aspect.

One of the above technical solutions has at least one of the following advantages or beneficial effects:

the cooling water channel formed by the first waist-shaped water channel, the axial water channel and the second waist-shaped water channel and surrounding the front bearing is provided with the first waist-shaped water channel and the second waist-shaped water channel which extend along the circumferential direction and the axial water channel which extends along the axial direction, so that the defect of cooling the front bearing of the electric spindle of the current machining center is overcome, the heat dissipation area of the front bearing is greatly increased, and the cooling effect is obvious.

Meanwhile, the first waist-shaped water channel and the second waist-shaped water channel are arranged on the front bearing seat, a channel for cooling medium to flow is further defined through the matching of the front bearing seat, the matching machine body assembly and the front end cover, more auxiliary structures are not needed to be added, the structure is simpler, and the forming is convenient.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of an embodiment of a front bearing structure of an electric spindle according to the present invention;

FIG. 2 is an isometric view of one embodiment front bearing mount structure shown in FIG. 1;

FIG. 3 is a schematic view of a first cross-sectional configuration of the front bearing housing of the embodiment shown in FIG. 1;

FIG. 4 is a second cross-sectional view of the front bearing housing of the embodiment shown in FIG. 1.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the present invention, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical solution of the present invention, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, it is not to be construed as limiting the present invention.

In the invention, the meaning of "a plurality" is one or more, the meaning of "a plurality" is more than two, and the terms of "more than", "less than", "more than" and the like are understood to exclude the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present invention, if there is description of "first" and "second" only for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the present invention, unless otherwise specifically limited, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in the present invention can be reasonably determined by those skilled in the art in combination with the detailed contents of the technical solutions.

Fig. 1 shows a reference direction coordinate system of an embodiment of the present invention, and the following describes an embodiment of the present invention with reference to the directions shown in fig. 1.

Referring to fig. 1, an embodiment of the present invention provides an electric spindle front bearing structure, including a machine body assembly 1 and a shaft core assembly (not shown in the figure), where the machine body assembly 1 is provided with an axial inner hole, and a front bearing seat 2 is provided at a front end of the axial inner hole; the shaft core assembly is arranged in the axial inner hole, and the front end of the shaft core assembly is supported on the front bearing seat 2 through a front bearing 7. One or more front bearings 7 are arranged as required, and the shaft core assembly can be driven to rotate in the machine body assembly 1 through a motor and outputs torque at the front end of the machine body assembly 1.

Referring to fig. 1-4, the front bearing seat 2 includes an embedding section 20 embedded in the axial inner hole, the front end of the front bearing seat 2 is provided with a front end cover 3, and the front end cover 3 is connected with the front bearing seat 2 to realize axial limiting of the front bearing 7. The front bearing block 2 is provided with cooling water passages including a plurality of first kidney-shaped water passages 21, a plurality of second kidney-shaped water passages 24, and a plurality of axial water passages 23.

Referring to fig. 2, a plurality of first kidney-shaped water channels 21 are disposed on the outer side surface of the insertion section 20 and are circumferentially spaced, the first kidney-shaped water channels 21 extend along the circumferential direction of the front bearing block 2, the first kidney-shaped water channels 21 are matched and attached to the axial inner hole, and a plurality of sections of channels for flowing of a cooling medium are formed on the outer side surface of the insertion section 20.

Referring to fig. 4, the plurality of second waist-shaped water channels 24 are disposed on the front end surface of the front bearing seat 2 and are distributed in a staggered manner with the first waist-shaped water channels 21 along the circumferential direction, the second waist-shaped water channels 24 extend along the circumferential direction of the front bearing seat 2, the second waist-shaped water channels 24 are matched and attached to the front end cover 3, and a plurality of sections of channels for cooling medium to flow are formed on the front end surface of the front bearing seat 2.

Referring to fig. 3 and 4, the plurality of axial water passages 23 are connected between the first and second waist-shaped water passages 21 and 24 which are alternately distributed, in other words, the axial water passages 23 are connected between the tail portions of the first waist-shaped water passages 21 and the head portions of the second waist-shaped water passages 24 or the axial water passages 23 are connected between the tail portions of the second waist-shaped water passages 24 and the head portions of the first waist-shaped water passages 21 in the circumferential direction of the front bearing block 2, and finally the first waist-shaped water passages 21, the axial water passages 23 and the second waist-shaped water passages 24 form zigzag cooling water passages around the front bearing 7.

The cooling water channel formed by the first waist-shaped water channel 21, the axial water channel 23 and the second waist-shaped water channel 24 and surrounding the front bearing 7 comprises the first waist-shaped water channel 21 and the second waist-shaped water channel 24 which extend along the circumferential direction and the axial water channel 23 which extends along the axial direction, so that the defect of cooling the front bearing 7 of the electric spindle of the current machining center is overcome, the heat dissipation area of the front bearing 7 is greatly increased, and the cooling effect is obvious.

Simultaneously, set up first waist type water course 21 and second waist type water course 24 on front bearing frame 2, further prescribe a limit to the passageway that supplies the coolant to flow through the cooperation of front bearing frame 2 with cooperation organism subassembly 1 and front end housing 3, make full use of the existing structure of electric main shaft like organism subassembly 1 and front end housing 3, needn't add more additional structure, the structure is simpler, and, first waist type water course 21 can direct forming in the outer peripheral face of front bearing frame 2, second waist type water course 24 can direct forming in the preceding terminal surface of front bearing frame 2, axial water course 23 directly can be in the drilling of the preceding terminal surface of front bearing frame 2, the preparation of whole cooling water course is very convenient.

Further, referring to fig. 1 and 2, the body assembly 1 is provided with a water inlet 11 and a water outlet, the water inlet 11 and the water outlet are distributed on two sides of the insertion section 20, and are respectively used for inflow and outflow of a cooling medium of the cooling water channel, the first waist-shaped water channel 21 includes a water inlet side first waist-shaped water channel 21(1) abutting against the water inlet 11 and a water outlet side first waist-shaped water channel 21(8) abutting against the water outlet, the cooling medium entering from the water inlet 11 flows along the water inlet side first waist-shaped water channel 21(1) to two sides, and each circulation half circle is collected in the water outlet side first waist-shaped water channel 21(8) and flows out through the water outlet. Through winding each circulation half-turn of front bearing frame 2 with coolant, can make the temperature of two half-turns unanimous relatively, promote the refrigerated homogeneity of front bearing 7 circumference, guarantee electric main shaft's job stabilization nature, avoid because of the cooling water course along with the extension of cooling route along circumference, the difference in temperature is too big to lead to the front bearing 7 circumference cooling inhomogeneous, influences electric main shaft's job stabilization nature.

The two ends of the first kidney-shaped water channel 21 are directly communicated with the axial water channel 23, or as shown in some embodiments in fig. 2 and 4, the two ends of the first kidney-shaped water channel 21 are provided with radial holes 22 communicated with the axial water channel 23. Specifically, the cooling medium provided by the spindle box of the machine tool enters the water inlet 11 on the machine body component 1, enters the first waist-shaped water channel 21(1) on the water inlet side on the front bearing seat 2, flows along the first waist-shaped water channel 21(1) on the water inlet side on the side surface of the front bearing seat 2 to both sides, enters the radial hole 22(1) and the radial hole 22(2) respectively, flows along the axial water channel 23(1) of the front bearing seat 2, enters the second waist-shaped water channel 24(1) on the end surface of the front bearing seat 2, enters the axial water channels 23(2), 22(3), returns to the other first waist-shaped water channel 21(2) on the side surface of the front bearing seat 2, and then is circulated next time. The cooling water entering the radial holes 22(2) and the cooling water entering the radial holes 22(1) circulate from the other side of the front bearing housing 2, and each circulation half-cycle is collected in the first water outlet side waist-shaped water passage 21(8) opposite to the first water inlet side waist-shaped water passage 21(1) and flows out of the front bearing housing 2, and the process is completed for cooling the front bearing 7.

In some embodiments, referring to fig. 1 and 4, the embedding section 20 is provided with first sealing ring mounting grooves 25 at front and rear sides of the first kidney-shaped water channel 21, and the first sealing ring is provided in the first sealing ring mounting grooves 25, so as to prevent the cooling medium of the first kidney-shaped water channel 21 from entering the inside of the housing assembly 1 and leaking.

In some embodiments, referring to fig. 4, the second kidney-shaped water channel 24 is provided with a second ring mounting groove 26 at the periphery thereof, and the second ring mounting groove 26 is provided with a second ring to prevent the cooling medium of the second kidney-shaped water channel 24 from leaking outwards.

An embodiment of the present invention provides an electric spindle, which includes the electric spindle front bearing 7 structure in any one of the above embodiments. The invention solves the defect of cooling the front bearing 7 of the electric spindle of the current machining center, and designs a cooling mode of an annular shape and an upper water channel and a lower water channel, so that the heat dissipation area of the front bearing 7 of the electric spindle is greatly increased, and the cooling effect is obvious.

In the description herein, references to the description of the term "example," "an embodiment," or "some embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope of the claims of the present application.