CN220416241U - Main shaft axle head airtight subassembly and electric main shaft - Google Patents

Abstract

The utility model provides a main shaft end air-tight seal assembly and an electric main shaft, wherein the main shaft end air-tight seal assembly comprises: the device comprises a mandrel, a bearing locking piece, a bearing gland, an end cover and an air inlet channel, wherein the bearing locking piece is arranged on the periphery of the mandrel, and at least part of the structure of the bearing gland and at least part of the structure of the end cover are respectively arranged on the periphery of part of the structure of the bearing locking piece; a first annular cavity and a first annular gap are arranged between the axial end, facing the end cover, of the bearing gland and the axial end, facing the bearing gland, of the bearing gland, the radial inner end of the first annular gap is communicated with the second annular gap, the radial outer end of the first annular gap is communicated with the first annular cavity, the flow cross section area of the first annular cavity is larger than that of the first annular gap, and the air inlet channel can introduce air into the first annular cavity. According to the utility model, the uniformity of the circumferential air curtain is increased, so that the sealing effect on the electric spindle is enhanced, and the problem of uneven circumferential air pressure of the airtight gap at the front end of the spindle is solved.

Description

Main shaft axle head airtight subassembly and electric main shaft

Technical Field

The utility model relates to the technical field of spindles, in particular to a spindle shaft end air-tight sealing assembly and an electric spindle.

Background

The machining center spindle mostly uses precision-grade and ultra-precision-grade rolling bearings. In order to protect the bearing from the contamination of water, oil and cuttings during processing, a sealing structure must be used at the front end of the spindle to avoid entry of contaminants and corrosion of the bearing, thereby reducing the service life of the spindle.

Most of the existing main shaft air sealing structures use an air sealing ring to generate a circumferential air curtain, and the sealing air enters a sealing gap from the air holes by arranging a limited radial air holes uniformly distributed in the circumferential direction of the air sealing ring. The circumferential air curtain formed by the air seal ring structure has limited air pressure uniformity due to the limited number of air holes. The air seal ring is generally processed by brass, the diameter of an air hole is small, and the processing cost is high; meanwhile, the air seal ring needs to be embedded into the static component by applying interference, and the assembly difficulty is high.

Because the circumferential air pressure of the airtight gap at the front end of the main shaft in the prior art is uneven and the like, the utility model designs the main shaft end airtight assembly and the electric main shaft.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that the circumferential air pressure of the airtight gap at the front end of the main shaft in the prior art is uneven, so as to provide the main shaft end airtight assembly and the electric main shaft.

In order to solve the above-mentioned problems, the present utility model provides a main shaft end air seal assembly comprising:

the bearing locking piece is arranged on the periphery of the mandrel so as to integrally rotate along with the mandrel, at least part of structures of the bearing locking piece and the end cover are respectively arranged on the periphery of part of structures of the bearing locking piece, the end cover is connected with the bearing locking piece in an axial direction, and a second annular gap is formed between the periphery of the bearing locking piece and the inner periphery of the bearing locking piece;

the bearing gland towards the axial end of the end cover and the axial end of the end cover towards the bearing gland are provided with a first annular cavity and a first annular gap, the radial inner end of the first annular gap is communicated with the second annular gap, the radial outer end of the first annular gap is communicated with the first annular cavity, the flow cross section area of the first annular cavity is larger than that of the first annular gap, and the air inlet channel can introduce air into the first annular cavity.

In some embodiments of the present utility model, in some embodiments,

The second annular gap also extends between the outer periphery of the bearing lock and the inner periphery of the end cap; the first annular cavity is a cavity formed by the bearing gland facing the axial end face of the end cover and being far away from the end cover in a recessed mode, the first annular cavity is an annular cavity circumferentially encircling the mandrel, the first annular gap is an annular gap circumferentially encircling the mandrel, the axial height of the first annular cavity is higher than that of the first annular gap, and the radial length of the first annular cavity is larger than or equal to that of the first annular gap.

In some embodiments of the present invention, in some embodiments,

the radial inner part section of the cover plate extends to be opposite to the axial direction of the bearing locking piece, a first bending gap is arranged between the radial inner part section of the cover plate and the bearing locking piece, a fit gap is arranged between the radial inner end of the cover plate and the mandrel, the fit gap is communicated with the first bending gap, and the first bending gap can change the flowing direction of fluid flowing into the first bending gap through the fit gap more than once.

In some embodiments of the present invention, in some embodiments,

the end of the first tortuous gap remote from the mating gap communicates with the second annular gap, and gas entering the second annular gap through the first annular cavity can enter the first tortuous gap to prevent fluid at the mating gap from flowing into the second annular gap.

In some embodiments of the present invention, in some embodiments,

at least one protruding structure is arranged on the axial end face of the radial inner side section of the cover plate, which faces the bearing locking piece, in a protruding manner in the direction of the bearing locking piece, at least one groove structure is concavely arranged on the axial end face of the bearing locking piece, which faces away from the cover plate, the protruding structure can be inserted into the groove structure, a second axial gap is arranged between the top of the protruding structure and the groove bottom of the groove structure, a first radial gap is arranged between the radial inner end of the protruding structure and the radial inner end of the groove structure, a second radial gap is arranged between the radial outer end of the protruding structure and the radial outer end of the groove structure, the groove structure is arranged between the radial inner end of the bearing locking piece and the radial outer end of the groove structure, a first axial gap is arranged between the radial outer end of the bearing locking piece and the groove structure along the axial direction, a first axial gap is arranged between the radial outer end of the bearing locking piece and the groove structure, a first axial gap is arranged between the groove structure and the cover plate, a first axial gap is arranged between the radial outer end of the bearing locking piece and the groove structure, a first axial gap is arranged between the radial outer end of the groove structure and the cover plate, a second axial gap is arranged between the radial outer end of the radial inner end of the bearing locking piece and the groove structure, a second axial gap comprises the first axial gap, a second axial gap and a second axial gap.

In some embodiments of the present invention, in some embodiments,

the radial inner of end cover is provided with the dirt collecting groove, the radial outer end of bearing retaining member is provided with the blowdown hole, the dirt collecting groove with the blowdown hole passes through the second annular clearance intercommunication, the inside of end cover still is provided with the trapway, the one end of trapway with dirt collecting groove intercommunication, the other end intercommunication extremely the outside of end cover.

In some embodiments of the present invention, in some embodiments,

the sewage collecting tank is of a concave tank structure which is arranged on the end face of the radial inner end of the end cover and is far away from the direction of the bearing locking piece, the sewage draining hole is of a concave tank structure which is arranged on the end face of the radial outer end of the bearing locking piece and is far away from the direction of the end cover, the sewage collecting tank is of an annular structure, the sewage draining hole is of a plurality of hole structures which are arranged along the circumferential interval, the sewage draining hole is communicated with the first bending gap, and the radial inner end of the sewage draining channel is communicated with the sewage collecting tank and the radial outer end of the sewage draining channel extends to the radial periphery of the end cover.

In some embodiments of the present invention, in some embodiments,

the dirt collection groove is arranged at a position close to the first bending gap relative to the first annular gap along the axial direction; the blowdown channel is a straight channel, the central axis of the blowdown channel is not perpendicular to the central axis of the mandrel, and when the central axis of the mandrel extends in the vertical direction, the height of the radial outer end of the blowdown channel is lower than that of the radial inner end of the blowdown channel.

In some embodiments of the present invention, in some embodiments,

the cover plate and the end cover are fixed through a threaded fastener; the axial one end of dabber is connected with the handle of a knife, the handle of a knife with the apron all set up in the axial one end of dabber.

In some embodiments of the present invention, in some embodiments,

the bearing is arranged on the periphery of the mandrel so as to support the mandrel, and the bearing locking piece can act on one axial end of the inner ring of the bearing.

In some embodiments of the present invention, in some embodiments,

the air inlet channel comprises a second air inlet channel and a third air inlet channel which are arranged in the bearing gland, one end of the third air inlet channel is communicated with the first annular cavity, the third air inlet channel is communicated between the second air inlet channel and the first annular cavity, and the extending direction of the second air inlet channel is not parallel to the extending direction of the third air inlet channel and forms an included angle between (0, 90);

the bearing seat is arranged on the periphery of the bearing to support the bearing, the air inlet channel further comprises a first air inlet channel arranged in the bearing seat, one axial end of the bearing seat is connected with the bearing gland, one end of the first air inlet channel can be communicated with the second air inlet channel, and the other end of the first air inlet channel can be used for introducing air.

In some embodiments of the present invention, in some embodiments,

the air inlet channel further comprises a fourth air inlet channel arranged on the bearing cover, the fourth air inlet channel is communicated between the first air inlet channel and the second air inlet channel, the first air inlet channel and the fourth air inlet channel are direct current channels, the central axes of the first air inlet channel and the fourth air inlet channel are overlapped and are parallel to the axis of the mandrel, the second air inlet channel is also a direct current channel, the central axis of the second air inlet channel is perpendicular to the central axis of the fourth air inlet channel, and the third air inlet channel is also a direct current channel, and the central axis of the third air inlet channel is perpendicular to the central axis of the second air inlet channel.

In some embodiments of the present invention, in some embodiments,

the radial inner side of one end, far away from the axial direction of the end cover, of the bearing gland is axially connected with the outer ring of the bearing; the radial outer end of the second air inlet flow passage penetrates through the radial outer peripheral surface of the bearing gland, and a plug is arranged at the radial outer end of the second air inlet flow passage; the periphery of the bearing seat is also provided with a bearing sleeve.

In some embodiments of the present invention, in some embodiments,

the bearing locking device comprises a mandrel, and is characterized by further comprising a sealing element, wherein the sealing element is arranged on the periphery of the mandrel so as to integrally rotate along with the mandrel and can act on one axial end of the inner ring of the bearing, the sealing element is arranged between one axial end of the inner ring of the bearing and the bearing locking element, and the bearing locking element applies a fastening force acting on the inner ring of the bearing through the sealing element.

In some embodiments of the present invention, in some embodiments,

the part structure of the bearing gland is opposite to the sealing element in the radial direction, a first protruding part is arranged on the part structure of the bearing gland opposite to the sealing element in the radial direction in a protruding mode in the direction of the sealing element, a second protruding part is arranged on the sealing element in the protruding mode in the direction of the bearing gland, a second bending gap is formed between the first protruding part and the second protruding part, a second annular cavity is formed between the first protruding part and the bearing locking element, the radial outer end of the second annular cavity is communicated with the second annular gap, and the radial inner end of the second annular cavity is communicated with the second bending gap.

In some embodiments of the present invention, in some embodiments,

the first bulge with the second bulge is along the relative setting in axial, just be provided with 2 at least first protruding muscle on the first bulge towards the direction of second bulge, form first depressed part between two adjacent first protruding muscle, be provided with 2 at least second protruding muscle on the second bulge towards the direction of first bulge, form the second depressed part between two adjacent second protruding muscle, first protruding muscle with the cooperation of second depressed part grafting forms first gas gap, the second protruding muscle with first depressed part grafting cooperates and forms second gas gap, second tortuous clearance includes first gas gap with second gas gap.

The utility model also provides an electric spindle which comprises the spindle shaft end air sealing assembly.

The main shaft end air sealing assembly and the electric main shaft provided by the utility model have the following beneficial effects:

1. according to the utility model, through the first annular cavity and the first annular gap which are arranged between the bearing gland and the end cover, externally introduced gas can be received in the first annular cavity to buffer and slow down the gas, and then the gas is supplied into the second annular gap through the first annular gap in a permeable supply mode, so that effective sealing is carried out between the bearing locking piece and the bearing gland and between the bearing gland and the end cover; impurities (including fluid and the like) entering the fit clearance of the cover plate are blocked and sealed, the impurities are prevented from entering the inner position of the electric spindle such as a bearing and the like, and as the first annular cavity and the first annular clearance are of annular structures, the dispersion area of the air curtain can be increased, the uniformity of the circumferential air curtain is increased, the sealing effect on the electric spindle is enhanced, and the problem of uneven circumferential air pressure of the airtight clearance at the front end of the spindle is solved;

2. The utility model further effectively increases the resistance of fluid entering the first tortuous gap from the fit gap through the first tortuous gap arranged between the fit gap and the second annular gap of the cover plate, thereby further preventing dirty gas and the like at the front end of the cover plate from entering the second annular gap through the fit gap, effectively enhancing the sealing performance of the inside of the electric spindle, and further preventing the dirty gas at the fit gap from entering the second annular gap through the first tortuous gap as the second annular gap receives the sealing gas sent from the first annular cavity and the first annular gap and then reaches the first tortuous gap, thereby further improving the sealing performance of the inside of the electric spindle; the second annular cavity and the second tortuous gap are arranged between the sealing element and the bearing gland, so that the resistance to fluid can be further increased, the fluid is buffered and slowed down through the second annular cavity, the fluid reaching the bearing is reduced, the sealing effect is achieved on the bearing part and the like, and the sealing performance of the inside of the electric spindle is further improved;

3. the utility model also can ensure that the pollutants after overcoming the first tortuous clearance and entering the second annular clearance can still be thrown out from the pollution discharge hole into the pollution collection groove under the action of centrifugal force and discharged along the pollution discharge channel which is obliquely arranged downwards through the pollution collection groove, the pollution discharge hole and the pollution discharge channel which are arranged at the end cover and communicated with the second annular clearance, thereby ensuring the purity of the gas in the electric spindle assembly, increasing the inlet amount of sealing gas, further improving the sealing performance in the electric spindle and solving the pollution discharge problem of the pollutants at the front end of the spindle.

Drawings

FIG. 1 is a longitudinal cross-sectional view of a seal assembly of an electric spindle of a vertical machining center of the present utility model;

FIG. 2 is an enlarged partial block diagram of portion A of FIG. 1;

FIG. 3 is a perspective view of the bearing lock of FIG. 1 according to the present utility model;

fig. 4 is a partially enlarged structural view of a portion B in fig. 2;

fig. 5 is a partial enlarged view of a portion C in fig. 2;

fig. 6 is a partial enlarged view of a portion D in fig. 2.

The reference numerals are:

1. a mandrel; 2. a bearing; 3. a bearing lock; 4. a bearing gland; 5. an end cap; 6. a first annular cavity; 7. a first annular gap; 8. a second annular gap; 9. a first intake runner; 10. a second intake runner; 11. a third intake runner; 12. a bearing seat; 13. a fourth intake runner; 14. a cover plate; 15. a first meandering gap; 16. a fit gap; 17. a bump structure; 18. a groove structure; 19. a first axial gap; 20. a first radial gap; 21. a second axial gap; 22. a second radial gap; 23. a third axial gap; 24. a seal; 25. a first projection; 26. a second projection; 27. a second meandering gap; 28. a second annular cavity; 29. the first convex rib; 30. a first concave portion; 31. the second convex rib; 32. a second concave portion; 33. a sewage collecting tank; 34. a trapway; 35. a knife handle; 36. a bearing sleeve; 37. and a sewage draining hole.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

As shown in fig. 1 to 6, the present utility model provides a main shaft end airtight seal assembly comprising:

the bearing locking piece 3 is arranged on the periphery of the mandrel 1 so as to integrally rotate along with the mandrel 1, at least part of the structure of the bearing locking piece 3 and at least part of the structure of the end cover 5 are respectively arranged on the periphery of part of the structure of the bearing locking piece 3, at least part of the structure of the end cover 5 is connected with the bearing locking piece 4 in the axial direction, and a second annular gap 8 is formed between the periphery of the bearing locking piece 3 and the inner periphery of the bearing locking piece 4;

a first annular cavity 6 and a first annular gap 7 are arranged between one axial end of the bearing gland 4, which faces the end cover 5, and one axial end of the end cover 5, which faces the bearing gland 4, the radial inner end of the first annular gap 7 is communicated with the second annular gap 8, the radial outer end of the first annular gap 7 is communicated with the first annular cavity 6, the flow cross-sectional area of the first annular cavity 6 is larger than that of the first annular gap 7, and the air inlet channel can introduce air into the first annular cavity 6.

According to the utility model, through the first annular cavity and the first annular gap which are arranged between the bearing gland and the end cover, externally introduced gas can be received in the first annular cavity to buffer and slow down the gas, and then the gas is supplied into the second annular gap through the first annular gap in a permeable supply mode, so that effective sealing is carried out between the bearing locking piece and the bearing gland and between the bearing gland and the end cover; the impurity (including fluid etc.) that gets into the fit clearance of apron carries out separation and sealed effect, prevents that it from getting into the inside position of electric main shaft such as bearing to because first annular chamber and first annular clearance are annular structure, can improve the dispersion area of air curtain, increased the homogeneity of circumference air curtain, thereby strengthen the sealed effect to electric main shaft, solved the inhomogeneous problem of circumference atmospheric pressure in the airtight clearance of main shaft front end.

The air flow of the air door is not directly blown against the axial center cylindrical gap (namely the second annular gap), but is axially blown to the first annular cavity formed by the adjacent static piece, and then the end surface gap formed by the static piece is permeated into the cylindrical surface gap of the rotating piece.

The utility model solves the following technical problems:

1. the problem of uneven circumferential air pressure of an airtight gap at the front end of the main shaft is solved;

2. solves the pollution discharge problem of the pollutant entering at the front end of the main shaft.

In some embodiments of the present utility model, in some embodiments,

the second annular gap 8 also extends between the outer periphery of the bearing lock 3 and the inner periphery of the end cap 5; the first annular cavity 6 is a cavity formed by recessing the axial end face of the bearing gland 4 towards the end cover 5 away from the end cover 5, the first annular cavity 6 is an annular cavity circumferentially surrounding the mandrel 1, the first annular gap 7 is an annular gap circumferentially surrounding the mandrel 1, the axial height of the first annular cavity 6 is higher than that of the first annular gap 7, and the radial length of the first annular cavity 6 is greater than or equal to that of the first annular gap 7.

This is the preferred form of construction of the second annular gap, first annular chamber and first annular gap of the utility model, i.e. the second annular gap is formed between the inner periphery of the end cap and the inner Zhou Jun of the bearing gland and the outer periphery of the bearing lock to allow gas to pass therethrough to seal between the rotating member (bearing lock) and the stationary member (end cap and bearing gland); the first annular cavity is preferably formed by arranging the bearing gland in a groove, the first annular cavity and the first annular gap are of annular structures, annular sealing effect between a bearing locking piece and an end cover (and/or the bearing gland) in the second annular gap can be effectively increased, sealing uniformity is improved, the first annular cavity can be made to contain gas to enter the first annular cavity for buffering and reducing through the axial height and the radial length which are larger than the corresponding size of the first annular gap, annular and slow permeation is formed in the second annular gap through the first annular gap, sealing uniformity of the second annular gap is improved, and sealing performance is improved.

The main improvement of the utility model is that the first annular chamber formed by the adjacent static parts is used for storing gas, the annular gap formed by the first annular chamber is used for penetrating sealing gas to the axial center cylindrical gap (namely the second annular gap) to form a circumferential air curtain, and compared with the sealing gas which directly enters the cylindrical surface gap (namely the second annular gap) of the rotating part (the axial center or the locking nut on the axial center) from a single or limited radial holes, the pressure of the air curtain is more uniform in the circumferential direction, and the sealing performance is better.

In some embodiments of the present utility model, in some embodiments,

the radial inner side section of the cover plate 14 extends to be opposite to the axial direction of the bearing locking piece 3, a first bending gap 15 is arranged between the radial inner side section of the cover plate 14 and the bearing locking piece 3, a fit gap 16 is arranged between the radial inner end of the cover plate 14 and the mandrel 1, the fit gap 16 is communicated with the first bending gap 15, and the first bending gap 15 can change the flowing direction of fluid flowing into the first bending gap 15 through the fit gap 16 more than once.

According to the utility model, one axial end of the end cover can be fixed through the structure of the cover plate, and as the cover plate is a fixing piece, a fit clearance is needed to be arranged between the cover plate and the mandrel at the inner periphery of the cover plate so as to meet the rotation of the mandrel, but as pollutants (such as dirty gas) possibly sucked into the outer axial side of the cover plate at the fit clearance can enter into the second annular clearance, the second annular clearance can be influenced, even the bearing position can be influenced, and the adverse condition can be caused.

Fig. 1 shows an airtight structure applied to an electric spindle of a vertical machining center according to the present utility model. The stationary member at the front end of the spindle includes: a cover plate 14, a front end cover (end cover 5), a front bearing cover (bearing cover 4), a front bearing seat (bearing seat 12) and a bearing sleeve 36; the spindle front end rotating member includes a spindle 1, a front bearing (bearing 2), a front spacer (seal 24), a front bearing lock nut (bearing lock 3) and a shank 35. The bearing seat 12 and the bearing gland 4 of the main shaft are respectively provided with an airtight air inlet channel, wherein the first air inlet channel 9 is arranged on the bearing seat, and the second air inlet channel 10 and the third air inlet channel 11 are arranged on the bearing gland 4 and are communicated.

Fig. 2 shows an enlarged partial view of the sealing structure, wherein two axially adjacent parts, the front bearing gland and the front end cap, form a first annular chamber 6 and a first annular gap 7 in the entire circumferential direction. After entering from the inlet flow channel, the sealing gas fills the first annular cavity 6 and then permeates into the second annular gap 8 from the first annular gap 7 around the whole circumference. The sealing gas flows out from the second annular gap upward and downward respectively. The upward air flow flows into the second annular cavity 28 and then flows out of the second tortuous gap 27 formed by the front spacer ring (the sealing element 24) and the bearing gland 4; the downward air flow flows out through the first meandering gap 15 formed by the cover plate 14 and the bearing lock 3 (the arrow direction in fig. 5 is the direction in which external chips or dust, contaminants enter the main shaft sealing gap, opposite to the direction in which the sealing air blows out).

In some embodiments of the present utility model, in some embodiments,

the end of the first meandering gap 15 remote from the fit gap 16 communicates with the second annular gap 8, and gas entering the second annular gap 8 through the first annular chamber 6 can enter the first meandering gap 15 to prevent fluid at the fit gap 16 from flowing into the second annular gap 8. The second annular gap is communicated with the radial outer end of the first bending gap, so that the second annular gap can receive sealing gas sent from the first annular cavity and the first annular gap and further reaches the first bending gap, dirty gas at the matched gap can be further prevented from entering the second annular gap through the first bending gap, and the sealing performance of the inside of the electric spindle is further improved.

In some embodiments of the present utility model, in some embodiments,

at least one protruding structure 17 is arranged on the axial end face of the radial inner side section of the cover plate 14 facing the bearing locking member 3 in a protruding manner in the direction of the bearing locking member 3, at least one groove structure 18 is arranged on the axial end face of the bearing locking member 3 facing the cover plate 14 in a recessed manner in a direction away from the cover plate 14, the protruding structure 17 can be inserted into the groove structure 18, a second axial gap 21 is arranged between the top of the protruding structure 17 and the groove bottom of the groove structure 18, a first radial gap 20 is arranged between the radial inner end of the protruding structure 17 and the radial inner end of the groove structure 18, a second radial gap 22 is arranged between the radial outer end of the protruding structure 17 and the radial outer end of the groove structure 18, the groove structure 18 is arranged between the radial inner end of the bearing locking member 3 and the radial outer end, a part between the radial inner end of the bearing locking member 3 and the groove structure 18 is provided with a first axial gap 19 along the axial direction, a part between the radial inner end of the bearing locking member 3 and the groove structure 18 is provided with a second axial gap 21, a second axial gap 23 is arranged between the radial inner end of the groove structure 18 and the groove structure 18, and the second axial gap 23 is provided with a second axial gap 23, and the second axial gap 20 is provided between the radial inner end of the groove structure 18 and the second axial gap 19.

The first bending gap is a further preferable structural form of the utility model, namely, a first axial gap, a first radial gap, a second axial gap, a second radial gap and a third axial gap which are communicated in sequence from the fit gap to the second annular gap can be formed through the structures of the matched convex structures and the groove structures, so that the airflow resistance flowing into the second annular gap from the fit gap is further effectively increased, the effective sealing effect on the second annular gap is effectively ensured, and the sealing performance on the interior of the electric spindle is further improved.

The first labyrinth gap 15 of the present utility model is formed by a combination of radial and axial gaps to form a three-stage labyrinth cavity. When contaminants enter the gap entrance, the contaminants need to undergo six 90 ° deflections (indicated by arrows in fig. 5) at the meandering gap before entering the second annular gap 8.

In some embodiments of the present utility model, in some embodiments,

the radial inner end of the end cover 5 is provided with a sewage collecting groove 33, the radial outer end of the bearing locking piece 3 is provided with a sewage draining hole 37, the sewage collecting groove 33 is communicated with the sewage draining hole 37 through the second annular gap 8, the inside of the end cover 5 is also provided with a sewage draining channel 34, and one end of the sewage draining channel 34 is communicated with the sewage collecting groove 33, and the other end of the sewage draining channel 34 is communicated to the outside of the end cover 5. The utility model also can ensure that the pollutants after overcoming the first tortuous clearance and entering the second annular clearance can still be thrown out from the pollution discharge hole into the pollution collection groove under the action of centrifugal force and discharged along the pollution discharge channel which is obliquely arranged downwards through the pollution collection groove, the pollution discharge hole and the pollution discharge channel which are arranged at the end cover and communicated with the second annular clearance, thereby ensuring the purity of the gas in the electric spindle assembly, increasing the inlet amount of sealing gas, further improving the sealing performance in the electric spindle and solving the pollution discharge problem of the pollutants at the front end of the spindle.

In fig. 3 of the present utility model, three radial drain holes 37 are formed in the bearing lock 3, and when the contaminants enter, they are thrown out into the annular dirt collecting groove 33 on the front end cover through the drain holes 37 by centrifugal force and discharged through the drain passage 34. The trapway 34 is angled to facilitate vertical installation of the outflow of contaminants. For contaminants entering the second annular gap 8, a continuous downward flow of sealing gas in the second annular gap 8 can seal the contaminants in the sump and drain.

In some embodiments of the present utility model, in some embodiments,

the dirt collecting groove 33 is a concave groove structure which is formed on the end face of the radial inner end of the end cover 5 and is far away from the direction of the bearing locking piece 3, the dirt discharging hole 37 is a concave groove structure which is formed on the end face of the radial outer end of the bearing locking piece 3 and is far away from the direction of the end cover 5, the dirt collecting groove 33 is an annular structure, the dirt discharging hole 37 is a plurality of hole structures which are arranged at intervals along the circumferential direction, the dirt discharging hole 37 is communicated with the first tortuous gap 15 (preferably communicated with the groove structure 18), and the radial inner end of the dirt discharging channel 34 is communicated with the dirt collecting groove 33, and the radial outer end extends to the radial periphery of the end cover 5 so as to discharge pollutants (including gas, liquid, solid impurities and the like).

The utility model is a preferable forming mode of the dirt collecting groove and the dirt discharging hole, namely the dirt collecting groove is a groove formed at the radial inner end of the end cover, and the dirt discharging hole is a groove formed at the radial outer end of the bearing locking piece, so that the dirt collecting groove is communicated with the dirt discharging hole through the second annular gap, the dirt discharging hole is communicated with the groove structure inside, dirt gas can be introduced, and the dirt is discharged to the outside of the end cover through the dirt collecting groove and the dirt discharging channel, and the dirt gas is thrown out by utilizing the rotary centrifugal force of the bearing locking piece.

In some embodiments of the present utility model, in some embodiments,

the dirt collection groove 33 is provided at a position close to the first meandering gap 15 with respect to the first annular gap 7 in the axial direction; the trapway 34 is a straight channel, the central axis of which is not perpendicular to the central axis of the mandrel 1, and when the central axis of the mandrel 1 extends in the vertical direction, the height of the radially outer end of the trapway 34 is lower than the height of the radially inner end thereof.

In some embodiments of the present utility model, in some embodiments,

the cover plate 14 and the end cover 5 are fixed through threaded fasteners; one axial end of the mandrel 1 is connected with a tool shank 35, and the tool shank 35 and the cover plate 14 are both arranged at one axial end of the mandrel 1; the bearing housing 12 is also provided with a bearing sleeve 36 at its outer periphery. The bearing lock is preferably a bearing lock nut and the seal is preferably a front spacer.

The cover plate is preferably fastened with the end cover through threads so that the cover plate and the end cover are kept integrally fixed, a part to be machined on a machine tool can be machined through a cutter handle structure at one end of the mandrel, and the bearing seat can be supported by the protection box through the bearing sleeve.

In some embodiments of the present utility model, in some embodiments,

the bearing device further comprises a bearing 2, the bearing 2 is arranged on the periphery of the mandrel 1 to support the mandrel 1, and the bearing locking piece 3 can act on one axial end of an inner ring of the bearing 2. According to the utility model, the spindle can be supported on the spindle and rotates through the arrangement of the bearing, and the function of the bearing locking piece is to pre-tighten one end of the axial direction of the inner ring of the bearing, so that the stability of the bearing in the spindle rotating process is ensured.

In some embodiments of the present utility model, in some embodiments,

the air inlet channel comprises a second air inlet channel 10 and a third air inlet channel 11 which are arranged in the bearing gland 4, one end of the third air inlet channel 11 is communicated with the first annular cavity 6, the third air inlet channel 11 is communicated between the second air inlet channel 10 and the first annular cavity 6, and the extending direction of the second air inlet channel 10 is not parallel to the extending direction of the third air inlet channel 11 and forms an included angle between (0, 90);

The bearing support device is characterized by further comprising a bearing support 12, wherein the bearing support 12 is arranged on the periphery of the bearing 2 so as to support the bearing 2, the air inlet channel further comprises a first air inlet channel 9 arranged in the bearing support 12, one axial end of the bearing support 12 is connected with the bearing gland 4, one end of the first air inlet channel 9 can be communicated with the second air inlet channel 10, and the other end of the first air inlet channel can introduce air.

This is the preferred structural form of the air intake passage of the present utility model, and preferably two second and third air intake passages communicating with each other are provided inside the bearing cover, and a first air intake passage is provided on the two bearing housing, so that sealing gas introduced from the outside through the first air intake passage sequentially enters the second and third passages, and then enters the first annular chamber, to provide sealing performance between the bearing locking member and the bearing cover and the end cover.

In some embodiments of the present utility model, in some embodiments,

the air inlet channel further comprises a fourth air inlet channel 13 arranged on the bearing gland 4, the fourth air inlet channel 13 is communicated between the first air inlet channel 9 and the second air inlet channel 10, the first air inlet channel 9 and the fourth air inlet channel 13 are both direct current channels, the central axes of the first air inlet channel 9 and the fourth air inlet channel 13 are overlapped and are parallel to the axis of the mandrel 1, the second air inlet channel 10 is also a direct current channel, the central axis of the second air inlet channel 10 is perpendicular to the central axis of the fourth air inlet channel 13, and the third air inlet channel 11 is also a direct current channel, and the central axis of the third air inlet channel 11 is perpendicular to the central axis of the second air inlet channel 10.

The utility model also preferably provides a fourth air inlet flow passage on the bearing gland, which can communicate the first air inlet flow passage with the second air inlet flow passage, preferably the central axes of the first air inlet flow passage, the fourth air inlet flow passage and the third air inlet flow passage are parallel to the axis of the mandrel, and the central axis of the second air inlet flow passage is perpendicular to the central axis of the mandrel, so as to ensure that sealing gas is effectively transmitted into the first annular cavity.

In some embodiments of the present utility model, in some embodiments,

the radial inner side of one end, far away from the axial direction of the end cover 5, of the bearing gland 4 is axially connected with the outer ring of the bearing 2; the radial outer end of the second intake runner 10 penetrates to the radial outer peripheral surface of the bearing cover 4, and a plug is arranged at the radial outer end of the second intake runner 10.

The bearing gland is preferably connected with the bearing outer ring along the axial direction, so that an effective supporting effect is achieved on the bearing outer ring, the second air inlet flow passage penetrates to the radial outer peripheral surface of the bearing gland to facilitate machining of the second air inlet flow passage, and the plug is arranged at the radial outer end of the second air inlet flow passage to ensure that the second air inlet flow passage can only suck gas from the first air inlet flow passage, but not suck gas from the plug.

In some embodiments of the present utility model, in some embodiments,

And a sealing member 24, wherein the sealing member 24 is arranged on the periphery of the mandrel 1 so as to integrally rotate along with the mandrel 1 and can act on one axial end of the inner ring of the bearing 2, the sealing member 24 is arranged between one axial end of the inner ring of the bearing 2 and the bearing locking member 3, and the bearing locking member 3 applies a fastening force to the inner ring of the bearing 2 through the sealing member 24.

The sealing element is arranged, so that the pretightening force of the bearing locking element can be transmitted to one axial end of the bearing inner ring to provide pretightening force for the bearing inner ring, and the sealing element is preferably a front spacing ring, so that the deformation effect can be achieved, and the self-adjusting performance of pretightening force for the bearing inner ring can be further enhanced through deformation.

In some embodiments of the present utility model, in some embodiments,

the part structure of the bearing gland 4 is opposite to the sealing element 24 in the radial direction, the part structure of the bearing gland 4 opposite to the sealing element 24 in the radial direction is provided with a first protruding part 25 protruding towards the direction of the sealing element 24, the sealing element 24 is provided with a second protruding part 26 protruding towards the direction of the bearing gland 4, a second tortuous gap 27 is formed between the first protruding part 25 and the second protruding part 26, a second annular cavity 28 is formed between the first protruding part 25 and the bearing locking element 3, the radial outer end of the second annular cavity 28 is communicated with the second annular gap 8, and the radial inner end of the second annular cavity 28 is communicated with the second tortuous gap 27.

The utility model further provides a first bulge and a second bulge which are arranged between the sealing element and the bearing gland, so that a second annular cavity and a second zigzag gap are effectively formed, the resistance of the second annular gap to the flow in the direction of the bearing can be increased, the fluid is buffered and slowed down through the second annular cavity, the fluid reaching the bearing is reduced, the sealing effect is realized on bearing parts and the like, and the sealing performance of the inside of the electric spindle is further improved.

The second tortuous gap 27 of the utility model also forms a labyrinth cavity by combining radial gaps and axial gaps, and prevents oil gas after lubricating the bearing from entering the second annular cavity; and simultaneously, the upward continuous sealing airflow in the second annular gap plugs oil gas into the oil return passage.

The amount of clearance of the first annular gap is preferably 0.2mm (clearance between the bearing gland and the end cap); the amount of clearance at the second annular gap is preferably 0.25mm (the gap between the bearing lock and the bearing gland); the minimum gap amount at the first meandering gap and the second meandering gap is preferably 0.25mm, and the maximum gap amount is preferably 1mm.

In some embodiments of the present utility model, in some embodiments,

the first protruding portion 25 and the second protruding portion 26 are oppositely arranged along the axial direction, at least 2 first protruding ribs 29 are arranged on the first protruding portion 25 towards the direction of the second protruding portion 26, a first concave portion 30 is formed between two adjacent first protruding ribs 29, at least 2 second protruding ribs 31 are arranged on the second protruding portion 26 towards the direction of the first protruding portion 25, a second concave portion 32 is formed between two adjacent second protruding ribs 31, the first protruding ribs 29 are in plug-in fit with the second concave portions 32 to form a first gas gap, the second protruding ribs 31 are in plug-in fit with the first concave portions 30 to form a second gas gap, and the second bending gap 27 comprises the first gas gap and the second gas gap.

This is a further preferred form of construction of the second labyrinth gap of the present utility model, enabling the formation of multiple segments of tortuous passages providing a labyrinth seal, enabling further increases in resistance to fluid flow to the bearing, further enhancing sealing performance to the bearing.

The utility model also provides an electric spindle which comprises the spindle shaft end air sealing assembly.

The improvement points of the utility model are as follows:

1. the utility model provides a hermetically sealed construction of main shaft front end, this structure relies on two axial adjacent parts to form first annular chamber and first annular gap in whole circumferencial direction, and after the sealed gas entered by the inlet channel, first annular chamber was filled earlier, and then from first annular gap whole week infiltration second annular gap, the air curtain homogeneity is strengthened greatly.

2. The inlet of the sealing gap (namely the second annular gap) is provided with 6-level 90-degree gap deflection, so that the entering resistance of pollutants is obviously increased, 3 pollution discharge holes are formed in the front bearing lock nut (the bearing lock piece 3), and even if the pollutants enter the sealing gap after overcoming the multi-level deflection, the pollutants can be thrown out from the pollution discharge holes into the sewage collecting tank under the action of centrifugal force and discharged along the sewage discharge channel formed by downward deflection.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (17)

1. The utility model provides a main shaft axle head airtight subassembly which characterized in that: comprising the following steps:

the bearing locking piece (3) is arranged on the periphery of the mandrel (1) so as to integrally rotate along with the mandrel (1), at least part of the structure of the bearing locking piece (4) and at least part of the structure of the end cover (5) are respectively arranged on the periphery of part of the structure of the bearing locking piece (3), at least part of the structure of the end cover (5) is connected with the bearing locking piece (4) in the axial direction, and a second annular gap (8) is formed between the periphery of the bearing locking piece (3) and the inner periphery of the bearing locking piece (4);

the bearing gland (4) towards the axial one end of the end cover (5) and the end cover (5) towards the axial one end of the bearing gland (4) are provided with a first annular cavity (6) and a first annular gap (7), the radial inner end of the first annular gap (7) is communicated with a second annular gap (8), the radial outer end of the first annular gap (7) is communicated with the first annular cavity (6), the flow cross section area of the first annular cavity (6) is larger than that of the first annular gap (7), and the air inlet channel can introduce air into the first annular cavity (6).

2. The main shaft end hermetic seal assembly according to claim 1, wherein:

the second annular gap (8) also extends between the outer periphery of the bearing lock (3) and the inner periphery of the end cap (5); the first annular cavity (6) is a cavity formed by recessing the axial end face of the bearing gland (4) towards the direction away from the end cover (5), the first annular cavity (6) is an annular cavity circumferentially encircling the mandrel (1), the first annular gap (7) is an annular gap circumferentially encircling the mandrel (1), the axial height of the first annular cavity (6) is higher than that of the first annular gap (7), and the radial length of the first annular cavity (6) is greater than or equal to that of the first annular gap (7).

3. The main shaft end hermetic seal assembly according to claim 1, wherein:

still include apron (14), apron (14) set up in keep away from of end cover (5) the axial one end of bearing gland (4) and with end cover (5) fixed connection, the radial inboard part section of apron (14) extend to with the axial of bearing retaining member (3) is opposite, just radial inboard part section of apron (14) with be provided with first tortuous clearance (15) between bearing retaining member (3), the radial inner of apron (14) with have fit gap (16) between dabber (1), fit gap (16) with first tortuous clearance (15) intercommunication, first tortuous clearance (15) can be to the direction of the fluid that flows in through fit gap (16) inflow more than one time in first tortuous clearance (15).

4. A main shaft end gas seal assembly according to claim 3, wherein:

an end of the first meandering gap (15) remote from the fit gap (16) communicates with the second annular gap (8), and gas entering the second annular gap (8) through the first annular chamber (6) can enter the first meandering gap (15) to prevent fluid at the fit gap (16) from flowing into the second annular gap (8).

5. A main shaft end gas seal assembly according to claim 3, wherein:

at least one projection structure (17) is arranged on the axial end face of the radial inner side section of the cover plate (14) towards the bearing locking piece (3) in a protruding way towards the bearing locking piece (3), at least one groove structure (18) is arranged on the axial end face of the bearing locking piece (3) towards the cover plate (14) in a recessed way towards the direction away from the cover plate (14), the projection structure (17) can be inserted into the groove structure (18), a second axial gap (21) is arranged between the top of the projection structure (17) and the groove bottom of the groove structure (18), a first radial gap (20) is arranged between the radial inner end of the projection structure (17) and the radial inner end of the groove structure (18), a second radial gap (22) is arranged between the radial outer end of the projection structure (17) and the radial outer end of the groove structure (18), the groove structure (18) is arranged between the radial inner end of the bearing locking piece (3) and the radial outer end, a second radial gap (22) is arranged between the radial inner end of the bearing locking piece (3) and the groove structure (18) and the radial inner end of the groove structure (18) along the axial gap (19), a third axial gap (23) is arranged between the radial outer end of the bearing locking piece (3) and the groove structure (18) along the axial direction and the cover plate (14), and the first bending gap (15) comprises the first axial gap (19), the first radial gap (20), the second axial gap (21), the second radial gap (22) and the third axial gap (23).

6. A main shaft end gas seal assembly according to claim 3, wherein:

the radial inner end of the end cover (5) is provided with a sewage collecting groove (33), the radial outer end of the bearing locking piece (3) is provided with a sewage draining hole (37), the sewage collecting groove (33) is communicated with the sewage draining hole (37) through the second annular gap (8), a sewage draining channel (34) is further arranged in the end cover (5), and one end of the sewage draining channel (34) is communicated with the sewage collecting groove (33) and the other end of the sewage draining channel is communicated with the outside of the end cover (5).

7. The spindle shaft end hermetic seal assembly according to claim 6, wherein:

the sewage collecting groove (33) is of a concave groove structure which is formed in the direction away from the bearing locking piece (3) and is arranged on the end face of the radial inner end of the end cover (5), the sewage draining hole (37) is of a concave groove structure which is formed in the direction away from the end cover (5) and is arranged on the end face of the radial outer end of the bearing locking piece (3), the sewage collecting groove (33) is of an annular structure, the sewage draining hole (37) is of a plurality of hole structures which are arranged at intervals along the circumferential direction, the sewage draining hole (37) is communicated with the first bending gap (15), and the radial inner end of the sewage draining channel (34) is communicated with the sewage collecting groove (33) and extends to the radial outer periphery of the end cover (5).

8. The spindle shaft end hermetic seal assembly according to claim 7, wherein:

the dirt collection groove (33) is arranged at a position close to the first meandering gap (15) relative to the first annular gap (7) along the axial direction; the blow-down channel (34) is a straight channel, the central axis of the blow-down channel is not perpendicular to the central axis of the mandrel (1), and when the central axis of the mandrel (1) extends along the vertical direction, the height of the radial outer end of the blow-down channel (34) is lower than the height of the radial inner end of the blow-down channel.

9. A main shaft end gas seal assembly according to claim 3, wherein:

the cover plate (14) and the end cover (5) are fixed through a threaded fastener; the axial one end of dabber (1) is connected with handle of a knife (35), handle of a knife (35) with apron (14) all set up in the axial one end of dabber (1).

10. The main shaft end hermetic seal assembly according to claim 1, wherein:

the bearing locking device is characterized by further comprising a bearing (2), wherein the bearing (2) is arranged on the periphery of the mandrel (1) so as to support the mandrel (1), and the bearing locking piece (3) can act on one axial end of an inner ring of the bearing (2).

11. The spindle shaft end hermetic seal assembly of claim 10, wherein:

The air inlet channel comprises a second air inlet channel (10) and a third air inlet channel (11) which are arranged in the bearing gland (4), one end of the third air inlet channel (11) is communicated with the first annular cavity (6), the third air inlet channel (11) is communicated between the second air inlet channel (10) and the first annular cavity (6), and the extending direction of the second air inlet channel (10) is not parallel to the extending direction of the third air inlet channel (11) and forms an included angle between (0, 90);

still include bearing frame (12), bearing frame (12) set up in the periphery of bearing (2) in order to right bearing (2), the air inlet channel still including set up in first intake runner (9) of the inside of bearing frame (12), the axial one end of bearing frame (12) with bearing gland (4) meet, the one end of first intake runner (9) can with second intake runner (10) intercommunication, the other end can introduce gas.

12. The main shaft end hermetic seal assembly according to claim 11, wherein:

the air inlet channel further comprises a fourth air inlet channel (13) arranged on the bearing gland (4), the fourth air inlet channel (13) is communicated between the first air inlet channel (9) and the second air inlet channel (10), the first air inlet channel (9) and the fourth air inlet channel (13) are both direct current channels, the central axes of the first air inlet channel and the fourth air inlet channel are overlapped and are parallel to the axis of the mandrel (1), the second air inlet channel (10) is also a direct current channel, the central axis of the second air inlet channel is perpendicular to the central axis of the fourth air inlet channel (13), and the third air inlet channel (11) is also a direct current channel, and the central axis of the third air inlet channel is perpendicular to the central axis of the second air inlet channel (10).

13. The main shaft end hermetic seal assembly according to claim 11, wherein:

the radial inner side of one end, far away from the axial direction, of the end cover (5) of the bearing gland (4) is axially connected with the outer ring of the bearing (2); the radial outer end of the second air inlet flow channel (10) penetrates through the radial outer peripheral surface of the bearing gland (4), and a plug is arranged at the radial outer end of the second air inlet flow channel (10); the periphery of the bearing seat (12) is also provided with a bearing sleeve (36).

14. The spindle shaft end hermetic seal assembly of claim 10, wherein:

the bearing assembly comprises a bearing (2) and is characterized by further comprising a sealing element (24), wherein the sealing element (24) is arranged on the periphery of the mandrel (1) so as to integrally rotate along with the mandrel (1) and can act on one axial end of the inner ring of the bearing (2), the sealing element (24) is arranged between one axial end of the inner ring of the bearing (2) and the bearing locking element (3), and the bearing locking element (3) applies a fastening force acting on the inner ring of the bearing (2) through the sealing element (24).

15. The spindle shaft end hermetic seal assembly of claim 14, wherein:

the part structure of the bearing gland (4) is opposite to the sealing element (24) in the radial direction, a first protruding part (25) is arranged on the part structure of the bearing gland (4) opposite to the sealing element (24) in a protruding way towards the direction of the sealing element (24), a second protruding part (26) is arranged on the sealing element (24) in a protruding way towards the direction of the bearing gland (4), a second bending gap (27) is formed between the first protruding part (25) and the second protruding part (26), a second annular cavity (28) is formed between the first protruding part (25) and the bearing locking element (3), the radial outer end of the second annular cavity (28) is communicated with the second annular gap (8), and the radial inner end of the second annular cavity (28) is communicated with the second bending gap (27).

16. The main shaft end hermetic seal assembly according to claim 15, wherein:

the first bulge (25) with the second bulge (26) is along the relative setting in axial, just on first bulge (25) towards the direction of second bulge (26) is provided with 2 at least first protruding muscle (29), forms first depressed part (30) between two adjacent first protruding muscle (29), on second bulge (26) towards the direction of first bulge (25) is provided with 2 at least second protruding muscle (31), forms second depressed part (32) between two adjacent second protruding muscle (31), first protruding muscle (29) with second depressed part (32) grafting cooperation and form first gas clearance, second protruding muscle (31) with first depressed part (30) grafting cooperation and form second gas clearance, second tortuous clearance (27) include first gas clearance and second gas clearance.

17. An electric spindle, characterized in that: comprising a main shaft end gas seal assembly according to any one of claims 1-16.