90-degree high-rigidity high-rotating-speed power tool apron

Abstract

The utility model discloses a 90-degree high-rigidity high-rotating-speed power tool apron which comprises a first box body, a second box body, a main shaft, a transmission shaft, a first bearing set and a second bearing set, the first bearing set and the second bearing set are reversely assembled on the main shaft, and the first bearing set and the second bearing set are respectively two angular contact bearings which are installed in series. The transmission shaft is assembled on the second box body through a third bearing pack and a fourth bearing pack, the third bearing pack comprises two angular contact bearings which are arranged in a back-to-back mode, the fourth bearing pack comprises two deep groove ball bearings which are arranged side by side, and the water circulation structure is located between the first bearing pack and the third bearing pack and near the position between the second bearing pack and the third bearing pack. The rigidity of the power tool apron can be enhanced, the power tool apron can adapt to high-rotating-speed operation, and the stability and efficiency of the power tool apron in the cutting machining process are guaranteed. Through the arrangement of the water circulation structure, the temperature of the surrounding box body in the operation process of the bearing pack can be reduced, the problem of overheat caused by temperature rise during long-time high-rotating-speed operation is solved, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lathe tool holder technical field, concretely relates to a 90 degrees high rigidity high -speed power tool holder. BACKGROUND

[0002] Power tool holder is used for one of cutting core components of turning and milling combined machine tool, can be used for clamping various processing tools, to realize the corresponding processing function such as milling, drilling, tapping, etc. At present, most of the unidirectional power tool holder, i.e. through a transmission shaft drives a spindle rotation, the spindle is generally assembled in the first box through two single-row tapered roller bearings, the transmission shaft is assembled in the second box through deep groove ball bearing, needle bearing, the transmission between the spindle and transmission shaft is formed by bevel gear set, the above tool holder structure is difficult to meet, aiming at the use requirement of high speed high rigidity power tool holder, so that the further research and development are needed on the internal structure and mounting mode of power tool holder. SUMMARY

[0003] The utility model discloses a 90 degrees high rigidity high -speed power tool holder that enhances the stability of structure support.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] 90 degrees high rigidity high -speed power tool holder, including first box, second box, second box one end is vertically assembled in the middle part of first box, the rotation of the spindle is arranged in the first box, the rotation of transmission shaft is arranged in the second box, the transmission of the driven bevel gear is assembled on the spindle, the transmission of the bevel gear is engaged with the driven bevel gear and is assembled on the transmission shaft, the spindle is assembled in the first box through the first bearing group, the second bearing group is distributed,

[0006] The first bearing group and the second bearing group are reversely assembled on the spindle, and the first bearing group and the second bearing group are respectively two series-connected angular contact bearings,

[0007] The transmission shaft is assembled in the second box through the third bearing group and the fourth bearing group, the third bearing group is assembled on the one end of the transmission shaft close to the spindle, and the fourth bearing group is assembled on the one end of the transmission shaft away from the spindle,

[0008] The third bearing group is two angular contact bearings installed back to back,

[0009] The fourth bearing group is two deep groove ball bearings arranged side by side,

[0010] Water circulation structure is arranged between the first box and the second box, and the water circulation structure is near the first bearing group and the third bearing group, and the second bearing group and the third bearing group, and the water outlet nozzle assembly is assembled on the first box and is communicated with the water circulation structure.

[0011] As a further implementation, the water circulation structure comprises a first water inlet channel, a second water inlet channel, a circulating water tank, a communication channel, a sealing assembly,

[0012] The first water inlet channel and the second water inlet channel respectively extend upward along the interior of the first box body from two corners opposite to the lower end surface of the first box body; the circulating water tank is recessed in the inner periphery of the transmission shaft mounting hole of the first box body and the upper end outer periphery of the second box body, and the first water inlet channel and the second water inlet channel are in communication with the circulating water tank through the communication channel,

[0013] A water outlet mounting hole in communication with the water circulation structure is formed in the lower side of the first box body, and the inlet end of the water outlet nozzle assembly is rotatably assembled in the water outlet mounting hole;

[0014] The sealing assembly comprises an upper sealing ring above the circulating water tank and a lower sealing ring below the circulating water tank, which are assembled between the inner periphery of the transmission shaft mounting hole of the first box body and the upper end outer periphery of the second box body.

[0015] As a further implementation, the second box body is provided with a first annular inner step at the lower end inner periphery and a second annular inner step at the upper end inner periphery; the transmission shaft is provided with a first annular outer step at the lower end outer periphery and a second annular outer step at the upper end,

[0016] The assembly space of the fourth bearing set is formed between the first annular inner step and the second annular outer step, the lower end of the outer ring of the fourth bearing set abuts against the first annular inner step, and the upper end of the inner ring abuts against the first annular outer step,

[0017] The second annular inner step and the second annular outer step are arranged flush, the second annular inner step abuts against the lower end of the outer ring of the third bearing set, and the lower end of the inner ring abuts against the second annular outer step;

[0018] A lower bearing gland abutting against the upper end of the outer ring of the third bearing is threadedly connected to the upper end in the second box body.

[0019] The power tool holder further comprises a right bearing gland, a right locking nut, a spacer, a gear washer, a left bearing gland, a left skeleton oil seal, and an ER nut,

[0020] The right locking nut is threadedly connected to the right end of the main shaft, the right bearing gland is assembled to the right end surface of the first box body, a part of the right end of the first bearing set is exposed to the right end surface of the first box body, the left end surface of the right bearing gland has a first clamping annular step, the axial wall of the first clamping annular step clamps the outer periphery wall of the outer ring of the right end of the first bearing set exposed to the right end surface of the first box body, and the radial wall of the first clamping annular step abuts against the right end surface of the outer ring of the right end of the first bearing set exposed to the right end surface of the first box body,

[0021] The spacer sleeve is assembled on the main shaft between the left end of the first bearing set and the driven bevel gear, and the gear gasket is between the right end of the second bearing set and the left end of the driven bevel gear;

[0022] The left bearing gland is assembled on the left end face of the first box body, and the left end of the second bearing set is exposed from the left end face of the first box body, the inner circumferential wall of the right end face of the left bearing gland has a second clamping annular step, the axial wall of the second clamping annular step clamps the outer circumferential wall of the outer ring of the left end of the second bearing set exposed from the left end face of the first box body, and the radial wall of the second clamping annular step abuts against the left end face of the outer ring of the left end of the second bearing set exposed from the left end face of the first box body,

[0023] The left skeleton oil seal is assembled between the left bearing gland and the main shaft, and the ER nut is assembled on the left end of the main shaft.

[0024] As a further embodiment, a lower skeleton oil seal is arranged between the outer periphery of the lower end of the transmission shaft and the inner periphery of the lower end of the second box body, and a stop step surface is formed on the inner wall of the lower end of the second box body or / and the outer wall of the lower end of the transmission shaft to abut against the front end face of the lower skeleton oil seal.

[0025] Compared with the prior art, the utility model has the advantages that:

[0026] 1、In the scheme, the first bearing set and the second bearing set are reversely assembled on the main shaft, the first bearing set and the second bearing set are respectively two series-connected angular contact bearings, the third bearing set is two angular contact bearings installed back to back, and the fourth bearing set is two deep groove ball bearings arranged side by side, the bearing arrangement mode of the first to fourth bearing sets is adopted, the rigidity of the power tool holder is enhanced, the operation of high speed can be adapted, and the stability and efficiency in the cutting process of the power tool holder are ensured.

[0027] 2、In the scheme, the water circulation structure is arranged near the first bearing set and the third bearing set and the second bearing set and the third bearing set, the temperature of the box body around the bearing set during operation can be reduced, the temperature at the bearing set can be correspondingly reduced, the problem of overheating due to long-time high-speed operation is reduced, and the service life is improved.

[0028] 3、In the scheme, the first clamping annular step and the second clamping annular step are arranged, the accuracy and stability of the assembly of the first bearing set and the second bearing set are ensured, the stability and accuracy of the assembly of the main shaft are effectively guaranteed, and the power tool holder with high rigidity and high speed can be stably operated. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used to explain the utility model together with embodiments of the utility model, and do not constitute limitations to the utility model. In the drawings:

[0030] Figure 1 is a three-dimensional split structure schematic view of the utility model;

[0031] Figure 2 is a side surface structure schematic view of the utility model;

[0032] Figure 3 is an internal section schematic view of the utility model;

[0033] Figure 4 is a section view of the first box along the water outlet nozzle assembly in the utility model;

[0034] Figure 5 is a section view of the first box along the water circulation structure in the utility model;

[0035] In the drawings, the marks represent as follows:

[0036] 1, first box, 2, second box, 3, main shaft, 4, transmission shaft, 5, driven bevel gear, 6, transmission bevel gear, 7, first bearing set, 8, second bearing set, 9, water circulation structure, 10, water outlet nozzle assembly, 11, first water inlet channel, 12, second water inlet channel, 13, circulating water tank, 14, communication channel, 15, upper sealing ring, 16, lower sealing ring, 17, first annular inner step, 18, second annular inner step, 19, first annular outer step, 20, second annular outer step, 21, lower bearing gland, 22, lower skeleton oil seal, 23, stop step surface, 24, right bearing gland, 25, right locking nut, 26, spacer sleeve, 27, gear gasket, 28, left bearing gland, 29, left skeleton oil seal, 30, ER nut, 31, first clamping annular step, 32, second clamping annular step, 33, installation slot, 34, third bearing set, 35, fourth bearing set, 36, water outlet installation hole, 37, water outlet pipe, 38, 0 type ring, 39, gasket 39. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0038] Please refer to Figures 1-5The utility model provides following technical scheme: 90 degrees high rigidity high speed power tool seat, including first box body 1, second box body 2, the both ends of first box body 1, second box body 2 are formed through respectively, the one end of second box body 2 is vertically assembled in the middle part of first box body 1, makes first box body 1 and second box body 2 form 90 degrees angle arrangement, rotationally arranged with main shaft 3 in first box body 1, after main shaft 3 is assembled in first box body 1, the both ends of main shaft 3 are in the outside of first box body 1 end face, rotationally arranged with transmission shaft 4 in second box body 2, after transmission shaft 4 is assembled in second box body 2, the both ends of transmission shaft 4 are in the outside of second box body 2 end face, the main shaft 3 in first box body 1 is assembled with driven bevel gear 5, transmission shaft 4 is assembled with transmission bevel gear 6 that is engaged with driven bevel gear 5 through the gear gland of the thread connection in transmission shaft 4 end, namely when transmission shaft 4 rotates, through the meshing transmission of transmission bevel gear 6, driven bevel gear 5, to realize the rotation of main shaft 3.

[0039] Wherein, main shaft 3 is assembled in first box body 1 through first bearing group 7, second bearing group 8 of interval distribution, to make main shaft 3 stably assembled in first box body 1, first bearing group 7, second bearing group 8 form reverse assembly on main shaft 3, namely the bearing arrangement direction in first bearing group 7 is different from the bearing arrangement direction in second bearing group 8, first bearing group 7, second bearing group 8 are two series installation's angular contact bearings, namely the angular contact bearing arrangement direction in first bearing group 7, second bearing group 8 is different, to enhance the stability of main shaft 3 in first box body 1, and transmission shaft 4 is assembled in second box body 2 through third bearing group 34, fourth bearing group 35, third bearing group 34 is assembled in the one end of transmission shaft 4 close to main shaft 3, fourth bearing group 35 is assembled in the one end of transmission shaft 4 away from main shaft 3, third bearing group 34 is two angular contact bearings of back-to-back installation, fourth bearing group 35 is two deep groove ball bearings arranged side by side, by the bearing of first to fourth bearing group in the application and bearing arrangement mode, enhance the rigidity of power tool seat and can adapt to the operation of high speed, guarantee the stability and efficiency of power tool seat in the cutting process.

[0040] Water circulation structure 9 is arranged between first box body 1 and second box body 2, and the water circulation structure 9 is arranged between the first bearing group 7 and the third bearing group 34 and between the second bearing group 8 and the third bearing group 34. By arranging the water circulation structure 9 between the bearing groups, the temperature of the surrounding box body during the operation of the bearing groups can be reduced, and the temperature of the bearing groups can also be correspondingly reduced, thereby reducing the problem of overheating due to long-time high-speed operation and improving the service life. The water outlet assembly 10 is arranged on the first box body 1 and is in communication with the water circulation structure 9. The water outlet assembly 10 can spray water out of the power tool seat and towards the cutting position to meet the cutting requirements.

[0041] In some embodiments, the water circulation structure 9 comprises a first water inlet channel 11, a second water inlet channel 12, a circulating water tank 13, a communication channel 14, a sealing assembly, the first water inlet channel 11 and the second water inlet channel 12 extend upward along the inside of the first box body 1 from two corners opposite to the lower end surface of the first box body 1, respectively; the circulating water tank 13 is recessed in the inner periphery of the transmission shaft 4 mounting hole of the first box body 1 and the upper end outer periphery of the second box body 2, the first water inlet channel 11 and the second water inlet channel 12 are in communication with the circulating water tank 13 through the communication channel 14; a water outlet mounting hole is provided on the lower side of the first box body 1 and is in communication with the water circulation structure 9, the inlet end of the water outlet nozzle assembly 10 is rotatably assembled in the water outlet mounting hole 36; the water in the first water inlet channel 11 and the second water inlet channel 12 flows into the circulating water tank 13 through the communication channel 14 to be cooled; the water outlet nozzle assembly 10 is in communication with the circulating water tank 13, and after the water in the two water inlet channels flows into the circulating water tank 13, it flows to the water outlet nozzle assembly 10, thereby increasing the stability of the water flowing into the circulating water tank 13 and ensuring the cooling of the bearing assembly and the ability of the water to spray from the power knife seat.

[0042] The sealing assembly comprises an upper sealing ring 15 assembled between the inner periphery of the transmission shaft 4 mounting hole of the first box body 1 and the upper end outer periphery of the second box body 2 and located above the circulating water tank 13, and a lower sealing ring 16 located below the circulating water tank 13, so as to seal the upper and lower parts of the circulating water tank 13 and avoid leakage.

[0043] In some embodiments, the lower end inner periphery of the second box body 2 is provided with a first annular inner step 17, and the upper end inner periphery is provided with a second annular inner step 18; the lower end outer periphery of the transmission shaft 4 is provided with a first annular outer step 19, and the upper end is provided with a second annular outer step 20; the first annular inner step 17 and the second annular outer step 20 form a fourth bearing assembly 35 assembly space, the lower end of the outer ring of the fourth bearing assembly 35 abuts against the first annular inner step 17, and the upper end of the inner ring abuts against the first annular outer step 19; compared with the bearing installation using a bearing clamp spring, the upper and lower positioning of the first annular inner step 17 and the second annular outer step 20 can enhance the assembly precision and stability of the fourth bearing assembly 35, so as to adapt to the stable operation of high speed.

[0044] The second annular inner step 18 and the second annular outer step 20 are arranged flush, the second annular inner step 18 abuts against the lower end of the outer ring of the third bearing assembly 34, and the lower end of the inner ring abuts against the second annular outer step 20; a lower bearing gland 21 abutting against the upper end of the outer ring of the third bearing is threadedly connected to the upper end in the second box body 2, so as to stably assemble the third bearing assembly 34 between the transmission shaft 4 and the second box body 2.

[0045] Wherein, through the clamping cooperation of the first annular inner step 17 and the second annular inner step 18, the precision of the assembly of the third bearing set 34 and the fourth bearing set 35 in the transmission shaft 4 and the second box body 2 is further enhanced.

[0046] In some embodiments, a lower skeleton oil seal 22 is arranged between the outer periphery of the lower end of the transmission shaft 4 and the inner periphery of the lower end of the second box body 2, and a stop step surface 23 is formed on the inner wall of the lower end of the second box body 2 or / and the outer wall of the lower end of the transmission shaft 4 to abut against the front end surface of the lower skeleton oil seal 22. By positioning the installation position of the lower skeleton oil seal 22 by the stop step surface 23, the precision and stability of the installation of the lower skeleton oil seal 22 are ensured, and the lower skeleton oil seal has better stable sealing capacity than the existing skeleton oil seal installed between the smooth inner walls of the transmission shaft 4 and the second box body 2.

[0047] In some embodiments, the power cutter base further comprises a right bearing gland 24, a right locking nut 25, a spacer sleeve 26, a gear gasket 27, a left bearing gland 28, a left skeleton oil seal 29, and an ER nut 30. The right locking nut 25 is threadedly connected to the right end of the main shaft 3, the right bearing gland 24 is assembled to the right end surface of the first box body 1, and a part of the right end of the first bearing set 7 is exposed to the right end surface of the first box body 1. The inner periphery of the left end surface of the right bearing gland 24 has a first clamping annular step 31, the axial wall of the first clamping annular step 31 clamps the outer periphery wall of the outer ring of the right end of the first bearing set 7 exposed to the right end surface of the first box body 1, and the circumferential precise positioning of the outer ring of the bearing set is realized through the simultaneous action of the axial wall of the first clamping annular step 31 and the inner wall of the first box body 1 (the inner wall of the assembly hole of the first bearing set 7 in the first box body 1). The radial wall of the first clamping annular step 31 abuts against the right end surface of the outer ring of the right end of the first bearing set 7 exposed to the right end surface of the first box body 1, realizing the axial installation positioning of the bearing set. Therefore, through the arrangement of the first clamping annular step 31, the assembly precision and stability of the first bearing set 7 are ensured, and the first bearing set 7 has high rigidity and high-speed operation capability.

[0048] Wherein, the spacer sleeve 26 is assembled on the main shaft 3 in a key groove manner, and is located between the left end of the first bearing set 7 and the driven bevel gear 5. The spacer sleeve 26 is composed of two or more sleeve bodies connected in sequence, and a washer can be added between the adjacent sleeve bodies to provide a certain pre-tightening support for the components on both sides of the spacer sleeve 26 during assembly.

[0049] The gear gasket 27 is located between the right end of the second bearing set 8 and the left end of the driven bevel gear 5, and is used to isolate the support between the second bearing set 8 and the driven bevel gear 5.

[0050] The left bearing gland 28 is assembled on the left end face of the first housing 1, and a part of the left end of the second bearing set 8 is exposed on the left end face of the first housing 1. The inner circumferential wall of the right end face of the left bearing gland 28 has a second clamping annular step 32. The axial wall of the second clamping annular step 32 clamps the outer circumferential wall of the outer ring of the second bearing set 8 exposed on the left end face of the first housing 1. The circumferential positioning of the outer ring of the bearing set is realized by the simultaneous action of the inner circumferential wall of the first housing 1 (the inner wall of the assembly hole of the second bearing set 8 in the first housing 1) and the axial wall of the second clamping annular step 32. The radial wall of the second clamping annular step 32 abuts against the left end face of the outer ring of the second bearing set 8 exposed on the left end face of the first housing 1, thereby realizing the axial installation positioning of the bearing set. Therefore, the assembly precision and stability of the second bearing set 8 are ensured by the second clamping annular step 32, and the high rigidity and high speed operation capability of the second bearing set 8 are realized.

[0051] The assembly precision and stability of the first bearing set 7 and the second bearing set 8 are ensured by the first clamping annular step 31 and the second clamping annular step 32, thereby effectively guaranteeing the stability and precision of the assembly of the main shaft 3, and realizing the stable operation of the high rigidity and high speed power tool holder.

[0052] The first housing 1 has installation notches 33 on both sides of the lower end. The installation notches 33 penetrate the side face of the first housing 1, so as to facilitate the position adjustment of the power tool holder during installation. The outer wall of the first housing 1 above the installation notches 33 does not form an obstruction to the installation notches 33 in the vertical projection from top to bottom, so as to facilitate the insertion of the connecting bolts from above the installation notches 33 and the operation of the connecting bolts.

[0053] The water outlet nozzle assembly 10 is composed of a water outlet pipe 37, an O-shaped ring 38 and a gasket 39. The bottom of the water outlet mounting hole 36 has a stepped face, the gasket 39 is arranged on the bottom stepped face, the O-shaped ring is assembled in the water outlet mounting hole 36 outside the gasket 39, one end of the water outlet pipe 37 has a spherical head, the spherical head is arranged in the water outlet mounting hole 36, the outer wall of the front end of the spherical head is in contact with the O-shaped ring, the other end of the water outlet pipe 37 has a water hole which is opened towards the ER nut 30, so that the water in the water outlet pipe 37 is sprayed towards the ER nut 30. The sealing between the spherical head and the water outlet mounting hole 36 is ensured by the O-shaped ring 38. The spherical head can rotate at a certain angle, which is convenient for adjustment according to needs. The inner hole diameter of the inlet end of the water outlet pipe 37 is larger than the inner hole diameter of the outlet end, and the inner hole diameter is larger than the diameter of the water hole, so that the sprayed water has a certain pressure.

[0054] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for the skilled in the art, it still can be modified, or for the equivalent replacement of part of the technical features of the technical solutions recorded in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application, shall be included within the scope of the present application.

Claims

1. 90 degrees high rigidity high speed power tool base, comprising a first box, a second box, the second box is vertically assembled in the middle of the first box, a main shaft is rotatably arranged in the first box, a transmission shaft is rotatably arranged in the second box, a driven bevel gear is assembled on the main shaft, a transmission bevel gear is assembled on the transmission shaft and engaged with the driven bevel gear, the main shaft is assembled in the first box through the first bearing group and the second bearing group which are distributed at intervals, characterized in that, the first bearing group and the second bearing group are reversely assembled on the main shaft, the first bearing group and the second bearing group are respectively two series-connected angular contact bearings, the transmission shaft is assembled in the second box through the third bearing group and the fourth bearing group, the third bearing group is assembled at one end of the transmission shaft close to the main shaft, and the fourth bearing group is assembled at one end of the transmission shaft away from the main shaft, the third bearing group is two angular contact bearings installed back to back, the fourth bearing group is two deep groove ball bearings arranged side by side, a water circulation structure is arranged between the first box and the second box, the water circulation structure is near the first bearing group and the third bearing group and the second bearing group and the third bearing group, and a water outlet nozzle assembly is assembled on the first box and communicates with the water circulation structure.

2. The 90 degree high rigidity high speed power tool holder of claim 1, wherein, The water circulation structure comprises a first water inlet channel, a second water inlet channel, a circulating water tank, a communication channel and a sealing assembly, the first water inlet channel and the second water inlet channel respectively extend upward along the inside of the first box from the two corners opposite the lower end surface of the first box, the circulating water tank is recessed in the inner periphery of the transmission shaft mounting hole in the first box and the upper end outer periphery of the second box, and the first water inlet channel and the second water inlet channel communicate with the circulating water tank through the communication channel, a water outlet mounting hole is formed in the lower side of the first box and communicates with the water circulation structure, and the inlet end of the water outlet nozzle assembly is rotatably assembled in the water outlet mounting hole; the sealing assembly comprises an upper sealing ring assembled between the inner periphery of the transmission shaft mounting hole of the first box and the upper end outer periphery of the second box and located above the circulating water tank, and a lower sealing ring located below the circulating water tank.

3. The 90-degree high rigidity high speed power tool base of claim 1, characterized in that, the lower end inner periphery of the second box is provided with a first annular inner step, and the upper end inner periphery is provided with a second annular inner step; the lower end outer periphery of the transmission shaft is provided with a first annular outer step, and the upper end is provided with a second annular outer step, the first annular inner step and the second annular outer step form an assembly space for the fourth bearing group, the lower end of the outer ring of the fourth bearing group abuts against the first annular inner step, and the upper end of the inner ring abuts against the first annular outer step, the second annular inner step and the second annular outer step are arranged flush, the second annular inner step abuts against the lower end of the outer ring of the third bearing group, and the lower end of the inner ring abuts against the second annular outer step; a lower bearing gland abutting against the upper end of the outer ring of the third bearing is threadedly connected to the upper end in the second box.

4. The 90 degree high rigidity high speed power tool holder of claim 1, wherein, The power tool base further comprises a right bearing gland, a right locking nut, a spacer, a gear gasket, a left bearing gland, a left skeleton oil seal and an ER nut. The right locking nut is threadedly connected to the right end of the main shaft, the right bearing gland is assembled to the right end face of the first box body, the right end of the first bearing set is partly exposed to the right end face of the first box body, the inner periphery of the left end face of the right bearing gland has a first clamping annular step, the axial wall of the first clamping annular step clamps the outer periphery wall of the outer ring of the right end of the first bearing set exposed to the right end face of the first box body, and the radial wall of the first clamping annular step abuts against the right end face of the outer ring of the right end of the first bearing set exposed to the right end face of the first box body, The spacer sleeve is assembled to the main shaft and is located between the left end of the first bearing set and the driven bevel gear, and the gear gasket is located between the right end of the second bearing set and the left end of the driven bevel gear; The left bearing gland is assembled to the left end face of the first box body, the left end of the second bearing set is partly exposed to the left end face of the first box body, the inner periphery of the right end face of the left bearing gland has a second clamping annular step, the axial wall of the second clamping annular step clamps the outer periphery wall of the outer ring of the left end of the second bearing set exposed to the left end face of the first box body, and the radial wall of the second clamping annular step abuts against the left end face of the outer ring of the left end of the second bearing set exposed to the left end face of the first box body, The left skeleton oil seal is assembled between the left bearing gland and the main shaft, and the ER nut is assembled to the left end of the main shaft.

5. The 90 degree high rigidity high speed power tool holder of claim 1, wherein, The lower skeleton oil seal is arranged between the outer periphery of the lower end of the transmission shaft and the inner periphery of the lower end of the second box body, and the stop step face abutting against the front end face of the lower skeleton oil seal is formed on the inner periphery wall of the lower end of the second box body or / and the outer periphery wall of the lower end of the transmission shaft.

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