CN207795854U - A kind of dynamic and static pressure hemisphere bearing shafting and precision machine tool - Google Patents

Abstract

The dynamic and static pressure hemisphere bearing shafting and precision machine tool of the utility model, including at least one dynamic and static pressure hemisphere bearing and rotation axis, dynamic and static pressure hemisphere bearing has support base, accommodate component and rotating member, it includes receiving member to accommodate component, multiple static pressure bushings and multiple dynamic pressure bushings, receiving member has multiple static pressure channels and dynamic pressure channel, static pressure serves as a contrast the opening for being set on the first cavity, dynamic pressure serves as a contrast the opening for being set on the second cavity, the cross section of dynamic pressure cavity is gradually expanded from bottom to opening, rotating member has evagination hemisphere face, support base has the support base inner cavity to match with the outer surface of receiving member.The dynamic and static pressure hemisphere bearing shafting of the utility model, when working condition, it is not in contact with each other with concave spherical surface when convex ball rotation, relative to dynamic and static pressure cone bearing, there is dynamic and static pressure hemisphere bearing better concentric fit degree, the dynamic rotary precision that bearing shafting upper rotary shaft can be improved using gas or hydrodynamic and hydrostatic pressure technology to reach 0.1 μm.

Description

A kind of dynamic and static pressure hemisphere bearing shafting and precision machine tool

Technical field

The utility model belongs to machinery field, and in particular to a kind of dynamic and static pressure hemisphere bearing shafting and lathe.

Background technology

It is contact condition when the revolute pair of the prior art rotates mostly, rotation precision and efficiency is not high.

The bearing combined with sphere structure using gas or the dynamic and static pressure technology of liquid is current raising main shaft running accuracy One of effective approach.

According to gas (air) or the dynamic and static pressure technology basic principle of liquid (fluid), liquid or gas medium, respectively enter Into multiple chambers of sphere bearing concave spherical surface, when convex ball rotation, medium forms dynamic pressure, convex ball rotating speed from multiple chambers It is higher, Media density is bigger, concave-convex sphere gap is smaller, dynamic pressure is bigger, convex due to there is certain gap between concave, convex spherical surface Ball floats, and contactless state is in when rotation, but the requirement on machining accuracy of the concave spherical surface of the sphere bearing and chamber is high, is processed into This is big.

Utility model content

The utility model is to carry out to solve the above-mentioned problems, and it is an object of the present invention to provide in a kind of bearing to hemisphere Concave spherical surface and chamber process required precision be not high, the dynamic and static pressure with dynamic pressure and static pressure technology half while capable of reducing processing cost Sphere bearing shafting and lathe.

The utility model provides a kind of dynamic and static pressure hemisphere bearing shafting, has the feature that, including dynamic and static pressure half Sphere bearing；And rotation axis, be arranged in dynamic and static pressure hemisphere bearing, wherein dynamic and static pressure hemisphere bearing have support base, Accommodate component and rotating member, accommodate component include the receiving member with indent hemisphere face and outer surface, multiple static pressure bushings with And multiple dynamic pressure bushings, receiving member have multiple static pressure channels for by fluid and dynamic pressure channel, static pressure channel and dynamic pressure Channel is separately positioned in the inner wall of receiving member and penetrates through indent hemisphere face and outer surface, and static pressure channel includes setting in indent half The first cavity to concave on spherical surface and the static pressure duct for being connected to the first cavity and outer surface, dynamic pressure channel include being arranged in indent The second cavity to concave on hemisphere face and the dynamic pressure duct for being connected to the second cavity and outer surface, static pressure bushing have cylindrical Static pressure cavity, static pressure lining is set on the opening of the first cavity and static pressure cavity is open towards indent hemisphere face, static pressure cavity Bottom be connected with the first cavity, dynamic pressure bushing have dynamic pressure cavity, dynamic pressure lining be set on the second cavity opening and The opening of dynamic pressure cavity is connected towards indent hemisphere face, the bottom of dynamic pressure cavity with the second cavity, dynamic pressure cavity it is transversal Face is gradually expanded from bottom to opening, and rotating member has the evagination hemisphere face to match with indent hemisphere face, is arranged in indent In hemisphere face, there is support base the support base inner cavity to match with the outer surface of receiving member, receiving member intracavitary is arranged in support base And be interference fitted with support base inner cavity, it is respectively arranged at least one first passage being connected with static pressure duct on support base, And at least one second channel being connected with dynamic pressure duct.

In dynamic and static pressure hemisphere bearing shafting provided by the utility model, it can also have the feature that：Wherein, more A static pressure bushing and multiple dynamic pressure bushings are arranged along at least one plane of arrangement on indent hemisphere face, plane of arrangement be perpendicular to The quantity of the plane of the rotation axis of rotating member, static pressure bushing is at least 3, and the quantity of dynamic pressure bushing is at least 3.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, the shape of static pressure cavity accent be round, ellipse, square, rectangle and it is trapezoidal in any one, dynamic pressure cavity chamber Mouthful shape be round, ellipse, square, rectangle and it is trapezoidal in any one, dynamic pressure cavity is cutd open along plane of arrangement Face is wedge shaped in the both ends of crescent or section.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, the depth of the indent of static pressure cavity is 0.5-5mm, and static pressure cavity total surface area accounts for the 20- of indent hemisphere face total surface area 60%, the depth of the indent of dynamic pressure cavity is 4-8mm, and dynamic pressure cavity total surface area accounts for the 20- of indent hemisphere face total surface area 60%, gap-ratio 2-2.5, the expression formula of gap-ratio are h2/h1, h2 be bottom and the evagination of dynamic pressure cavity it is hemispherical away from From h1 is the top end face and the hemispherical distance of evagination of dynamic pressure bushing.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, multiple first cavitys and multiple second cavitys are uniformly disposed alternately at along plane of arrangement on indent hemisphere face, indent hemisphere face On be also evenly arranged with a plurality of isolation channel, isolation channel between adjacent two the first cavitys and the second cavity, isolation channel Elongated end is intersected on the rotation axis of revolving member, and the groove width of isolation channel is 2-4mm, depth 2-5mm, indent hemisphere Face and the hemispherical surface of evagination are both provided with corrosion-inhibiting coating.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, the top end face of static pressure bushing is higher than indent hemisphere face, and the top end face of dynamic pressure bushing is higher than indent hemisphere face, the first cavity and the Two cavitys are cylindrical.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, the top end face of static pressure bushing is the arcwall face coincideing with indent hemisphere face and coincide with indent hemisphere face, the top of dynamic pressure bushing End face is the arcwall face coincideing with indent hemisphere face and coincide with indent hemisphere face.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, static pressure bushing and receiving member are to be fixedly connected or be detachably connected, and dynamic pressure bushing is fixedly connected or detachably with receiving member Connection.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, the evagination hemisphere face upper edge plane of arrangement of rotating member is provided with indent corresponding with static pressure cavity and dynamic pressure cavity bushing The annulus of annular groove or evagination.

In addition, in dynamic and static pressure hemisphere bearing shafting provided by the utility model, can also have the feature that：Its In, the through hole to match is provided in rotating member and receiving member, rotation axis is arranged in through hole and penetrates through rotating member and appearance Part is received, alternatively, rotation axis is arranged in rotating member.

The utility model provides also a kind of precision machine tool, uses the dynamic and static pressure hemisphere bearing axis of above-mentioned any one System, it is characterised in that：

Wherein, rotation axis is the workpiece rotary shaft or tool rotating shaft in precision machine tool.

In precision machine tool provided by the utility model, it can also have the feature that：

Wherein, precision machine tool is any one in lathe, grinding machine, boring machine, milling machine.

The effect of utility model

Dynamic and static pressure hemisphere bearing shafting involved by the utility model, when working condition, when convex ball rotation with it is recessed Spherical surface is not in contact with each other, and is in gas or state of liquid friction always, in this way, rotation center jerk value when convex ball rotation and bumps The foozle of ball is not directly dependent upon, i.e., convex ball jerk value is not equal to concave-convex ball deviation from circular from amount, according to actual measurement, convex ball rotation When jerk value be concave-convex ball deviation from circular from amount 1/10-3/10, relative to dynamic and static pressure cone bearing, dynamic and static pressure hemisphere axis It holds with better concentric fit degree, therefore the dynamic of bearing shafting upper rotary shaft can be improved using gas or hydrodynamic and hydrostatic pressure technology State running accuracy, reaches 0.1-1.0 μm.

Dynamic pressure technology, which is not required to input, the medium of pressure, but it is essential to ensure that there are enough oil masses, certain viscous in recessed spherical cavity room Smaller gap has this to form inclined wedge (wedge point towards the direction of rotation of convex ball) between the medium of degree, recessed ball and convex ball A little conditions, when convex ball rotation, medium gets into small end from inclined wedge big end and forms dynamic pressure, it follows that convex ball does not turn not produce Raw pressure, rotating speed is higher, Media density is bigger, concave-convex sphere gap is smaller, and dynamic pressure is bigger.

The fuel tank of outside setting divides two-way fuel feeding, controls oil liquid pressure and the laggard pressure oil in meditation of flow by flow controller respectively Chamber and dynamic pressure grease chamber, the two functions are selected as needed, as required to bear high speed and carrying big precision equipment, should be adopted simultaneously With fluid pressure and dynamic pressure hemisphere bearing, the equipment big to low speed and carrying uses hydrostatic bearing, high speed light loading equipment to use Hydrodynamic bearing.A tractor serves several purposes can be realized, to save production cost.

In addition, being arranged on indent hemisphere face after being due to dynamic pressure bushing and static pressure bushing, dynamic pressure cavity and static pressure are recessed The processing of chamber can be processed individually, therefore difficulty of processing substantially reduces, to improve dynamic pressure cavity and static pressure cavity processing Working efficiency reduces processing cost.

Description of the drawings

Fig. 1 is dynamic and static pressure hemisphere bearing shafting schematic diagram in the embodiments of the present invention；

Fig. 2 is dynamic and static pressure hemisphere revolute pair schematic diagram in the embodiments of the present invention；

Fig. 3 is the schematic side view of receiving member in the embodiments of the present invention；

Fig. 4 is B-B schematic cross-sectional views in Fig. 3；

Fig. 5 be in Fig. 2 part A in the cutaway enlargement diagram of plane of arrangement；

Fig. 6 is the enlarged diagram of C in Fig. 2；And

Fig. 7 is the diagrammatic cross-section of support base.

Specific implementation mode

In order to make the technical means, creative features, achievement of purpose, and effectiveness of the utility model be easy to understand, with Lower embodiment combination attached drawing is specifically addressed the dynamic and static pressure hemisphere bearing shafting and lathe of the utility model.

Embodiment one

As shown in Figure 1, dynamic and static pressure hemisphere bearing shafting 100 includes 2 dynamic and static pressure hemisphere bearings and a rotation axis 40。

Dynamic and static pressure hemisphere bearing includes accommodating component 10, rotating member 20, support base 30.

As shown in Fig. 2, it includes receiving member 11, multiple static pressure bushings 12 and multiple dynamic pressure bushings to accommodate component 10 13。

As shown in figure 4, receiving member 11 includes indent hemisphere face 111, outer surface 112, multiple static pressure channels 113, Duo Gedong Pressure passageway 114 and through-hole 116.

And some do not need axis by occasion, receiving member 11 can be not provided with through-hole 116.In the present embodiment, accommodate Part 11 111 center of indent hemisphere face it is horizontally arranged be useful for rotation axis 40 by through-hole 116, receiving member 11 use Metal is made.

Static pressure channel 113 is arranged in the inner wall of receiving member 11 and penetrates through indent hemisphere face 111 and outer surface 112, static pressure Channel 113 includes that the first cavity 113a to concave on indent hemisphere face 111 is arranged and is connected to the first cavity 113a and appearance The static pressure duct 113b in face 112, static pressure channel 113 are used for through fluid, the static pressure hole that external high-pressure fluid passes through outer surface Road 113b enters recessed hemisphere face 111.In the present embodiment, which is liquid oil.

Dynamic pressure channel 114 is arranged in the inner wall of receiving member 11 and penetrates through indent hemisphere face 111 and outer surface 112, dynamic pressure Channel 114 includes that the second cavity 114a to concave on indent hemisphere face 111 is arranged and is connected to the second cavity 114a and appearance The dynamic pressure duct 114b in face 112, dynamic pressure channel 114 are used for through fluid, the dynamic pressure duct that external fluid passes through outer surface 114b enters recessed hemisphere face 111.In the present embodiment, which is liquid oil.

As shown in fig. 6, there is static pressure bushing 12 cylindrical static pressure cavity 121, static pressure bushing 12 to be arranged in the first cavity The opening of 113a and the opening of static pressure cavity 121 are towards indent hemisphere face 111, the bottom of static pressure cavity 121 and the first cavity 113a is connected, and in embodiment, the first cavity 113a is cylinder, and static pressure bushing 12 is made of metal.

As shown in figure 5, there is dynamic pressure bushing 13 dynamic pressure cavity 131, dynamic pressure bushing 13 opening in the second cavity 114a is arranged At mouthful and the opening of dynamic pressure cavity 131 is towards indent hemisphere face 111, and the bottom of dynamic pressure cavity 131 is connected with the second cavity 114a Logical, the cross section of dynamic pressure cavity 131 is gradually expanded from bottom to opening, and in embodiment, the second cavity 114a is cylinder, Dynamic pressure bushing 13 is made of metal.

As shown in Figure 2 and Figure 3, multiple static pressure bushings 12 and multiple dynamic pressure bushings 13 are arranged along at least one plane of arrangement On indent hemisphere face 111, plane of arrangement is in the plane of 20 rotation axis of rotating member, embodiment, rotating member 20 rotates Axis is horizontal line, and plane of arrangement is two, and 8 static pressure bushings 12, another plane of arrangement setting 8 is arranged in a plane of arrangement A dynamic pressure bushing 13.

As shown in Fig. 2, rotating member 20 has evagination hemisphere face 21, evagination hemisphere face 21 and the indent hemisphere face of rotating member 20 111 match, and have certain gap, the axis collinear of the axis and the indent conical surface 111 of rotating member 20, rotation between concave, convex spherical surface The rotation in indent hemisphere face 111 around horizontal line of part 20, when external liquid oil passes through the static pressure duct 113b of outer surface, dynamic pressure When duct 114b enters recessed hemisphere face 111, rotating member 20 floats, and is in contactless state with recessed ball when convex ball rotation.

In embodiment, rotating member 20 be provided in the horizontal direction with through-hole 116 match for rotation axis 40 by Through-hole.

There is support base 30 the support base inner cavity to match with the outer surface 112 of receiving member 11, the setting of receiving member 11 to support Seat in intracavitary and with support base inner cavity be interference fitted.

At least one first passage 31 being connected with static pressure duct 113b is provided on support base 30.

At least one second channel 32 being connected with dynamic pressure duct 115b is provided on support base 30.

As shown in fig. 7, first passage 31 includes 311 and first annular groove 312 of at least one first duct, 312 edge of annular groove The setting of at least one plane of arrangement indent matches on support base surface of internal cavity and with static pressure duct 113b, the first duct 311 One end be connected to the first annular groove 312, the other end is in communication with the outside.In embodiment, the quantity in the first duct 311 is 1, first The quantity of annular groove 312 is 1.

Second channel 32 includes 321 and second annular groove 322 of at least one second duct, and the second annular groove 322 is along at least one The setting of a plane of arrangement indent matches on support base surface of internal cavity and with dynamic pressure duct 115b, the one end in the second duct 321 It is connected to the second annular groove 322, the other end is in communication with the outside.In embodiment, the quantity in the second duct 321 is 1, the second annular groove 322 quantity is 1, and support base 30 is made of metal.

Rotation axis 40 is arranged in through-hole 116 and perforation rotating member 20 and receiving member 10, and in embodiment, rotation axis 40 uses Metal is made, and rotation axis 40 is connect with 20 interference of rotating member,

The indent hemisphere face arrangement of two dynamic and static pressure hemisphere bearings is the internal concave surface of inner concave, can also be in turn Back-to-back arrangement is carried out, the arrangement in embodiment is the internal concave surface of inner concave.

Embodiment two

The present embodiment other structures are identical as embodiment two, the difference is that the shape of 121 accent of static pressure cavity is round, ellipse Round, square, rectangle and it is trapezoidal in any one, the shape of 131 accent of dynamic pressure cavity is round, ellipse, square Shape, rectangle and it is trapezoidal in any one, dynamic pressure cavity 131 along plane of arrangement section in crescent or along plane of arrangement The both ends of section are wedge shaped.

The shape of 121 accent of static pressure cavity is ellipse in embodiment two, the shape of 131 accent of dynamic pressure cavity be it is trapezoidal, Dynamic pressure cavity 131 is in crescent along the section of plane of arrangement.

Embodiment three

The present embodiment other structures are identical as embodiment two, the difference is that the top end face of static pressure bushing 12 and dynamic pressure bushing 13 It is above indent hemisphere face 111, in embodiment three, top end face and the indent hemisphere face 11 of static pressure bushing 12 and dynamic pressure bushing 13 Distance is 0.5mm.

The axial section of static pressure bushing 12 can be stairstepping, and the axial section of dynamic pressure bushing 13 may be stairstepping Shape.

Example IV

As shown in fig. 6, the present embodiment other structures are identical as embodiment three, the difference is that the top end face of static pressure bushing 12 is It the arcwall face that coincide with indent hemisphere face 111 and coincide with indent hemisphere face 111, the top end face of dynamic pressure bushing 13 is and indent half It the identical arcwall face of spherical surface 111 and coincide with indent hemisphere face 111.

Embodiment five

The present embodiment other structures are identical as example IV, the difference is that the depth of static pressure cavity 121 to concave is 0.5-5mm, 121 total surface area of static pressure cavity account for the 20-60% of indent hemisphere face total surface area, dynamic pressure cavity 131 it is inside Recessed depth is 4-8mm, and 131 total surface area of dynamic pressure cavity accounts for the 20-60% of indent hemisphere face total surface area, and gap-ratio is The expression formula of 2-2.5, gap-ratio are h2/h1, and h2 is bottom and the hemispherical distance of evagination of dynamic pressure cavity, and h1 serves as a contrast for dynamic pressure The top end face of set and the hemispherical distance of evagination.When gap-ratio is 2.2, bearing capacity is maximum.It is according to load, rotating speed, oil Viscosity, axis and bearing material and the factors such as machining accuracy determine.

The depth of static pressure cavity 121 and dynamic pressure cavity 131 to concave is 4mm in embodiment five, and static pressure cavity 121 is total Surface area accounts for the 22% of 11 total surface area of indent hemisphere face, and 131 total surface area of dynamic pressure cavity accounts for 11 total surface area of indent hemisphere face 22%, gap-ratio 2.2.

Embodiment six

The other structures of the present embodiment are identical as embodiment five, the difference is that static pressure bushing 12 and the first cavity 113a are solid Fixed connection, dynamic pressure bushing 13 are to be fixedly connected with the second cavity 114a, the connection type of static pressure bushing 12 and the first cavity 113a Using bonding or interference fit, dynamic pressure bushing 13 is with the second cavity 114a connection types using Nian Jie or interference fit, embodiment Static pressure bushing 12 uses Nian Jie, dynamic pressure bushing 13 and the second cavity 114a connection sides with the connection type of the first cavity 113a in six Formula is using bonding.

Embodiment seven

The other structures of the present embodiment are identical as embodiment five, the difference is that static pressure bushing 12 and the first cavity 113a are can Dismantling connection, dynamic pressure bushing 13 and the second cavity 114a are to be detachably connected.

Static pressure bushing 12 is connect with the connection type of the first cavity 113a using screw in embodiment seven, dynamic pressure bushing 13 with The connection type of 114a is connected using screw.

Embodiment eight

The other structures of the present embodiment are identical as embodiment seven, the difference is that being provided with anti-corrosion painting on evagination hemisphere face 21 Layer.

Corrosion-inhibiting coating in embodiment eight is anti-decaying paint.

Embodiment nine

The other structures of the present embodiment are identical as embodiment seven, the difference is that being provided with anti-corrosion painting on indent hemisphere face 11 Layer.

Corrosion-inhibiting coating in embodiment nine is nano ceramics.

Embodiment ten

As shown in figure 3, the other structures of the present embodiment are identical as embodiment six, the difference is that static pressure bushing 12 and dynamic pressure lining Set 13 is uniformly disposed alternately at along plane of arrangement on indent hemisphere face 111, be also evenly arranged on indent hemisphere face 11 it is a plurality of every From slot 115, isolation channel 115 is between adjacent two the first cavity 113a and the second cavity 114a, the extension of isolation channel 115 End is intersected on the rotation axis of revolving member, and the groove width of isolation channel 115 is 2-4mm, depth 2-5mm.

The groove width of isolation channel 115 is 2.5mm in embodiment ten, and depth 2mm, quantity is 8.

Embodiment 11

The other structures of the present embodiment are identical as embodiment five, the difference is that 21 upper edge of evagination hemisphere face of revolving member 20 Plane of arrangement is provided with the annular groove 211 to concave corresponding with static pressure cavity 121, and corresponding with dynamic pressure cavity 131 The annular groove 212 to concave.

Embodiment 12

The other structures of the present embodiment are identical as embodiment five, the difference is that 21 upper edge of evagination hemisphere face of revolving member 20 Plane of arrangement is provided with the annulus of convex corresponding with static pressure cavity 121 and dynamic pressure cavity 131.

Embodiment 13

The other structures of the present embodiment are identical as embodiment ten, unlike first passage 31 include it is a plurality of be respectively communicated with it is dynamic Press duct 113b and the first extraneous duct 311, but without the first annular groove 312, second channel 32 include it is a plurality of be respectively communicated with it is dynamic Duct 114b and the second extraneous duct 321 are pressed, but without the second annular groove 322.In embodiment, the first duct 311 and the second hole The quantity in road 32 is 8.

Embodiment 14

A kind of precision machine tool, using the dynamic and static pressure hemisphere bearing shafting of any one above-mentioned as precision machine tool in Workpiece rotary shaft or tool rotating shaft.

In the present embodiment, dynamic and static pressure hemisphere bearing shafting uses the dynamic and static pressure hemisphere bearing shafting in embodiment five, Rotation axis is the workpiece rotary shaft in precision machine tool.

Embodiment 15

The other structures of the present embodiment are identical as embodiment 14,

Its precision machine tool is any one in lathe, grinding machine, boring machine, milling machine.

Precision machine tool is lathe in the present embodiment.

The effect of embodiment

Dynamic and static pressure hemisphere bearing shafting involved by the present embodiment, when convex ball rotation, are not in contact with each other with recessed ball, begin It is in state of liquid friction eventually, in this way, the foozle of the rotation center jerk value and concave-convex ball when convex ball rotation is not direct Relationship, i.e., convex ball jerk value is not equal to concave-convex ball deviation from circular from amount, and according to actual measurement, jerk value when convex ball rotation is concave-convex ball circle The 1/10-3/10 of the margin of error is spent, therefore main shaft dynamic rotary precision can be improved using the dynamic and static pressure technology of liquid.

In addition, bushing is arranged after being on indent hemisphere face, the difficulty of processing of bushing cavity requires to substantially reduce, to The working efficiency for improving the processing of bushing cavity, reduces processing cost.

Further, static pressure bushing, dynamic pressure bushing top be above indent hemisphere face, the hemispherical machining accuracy of indent It is of less demanding, have and improve working efficiency, reduces the effect of indent hemisphere face processing cost.

Further, static pressure bushing, dynamic pressure bushing are to be adhesively fixed to connect with receiving component, have spy easy to process Point.

Further, the evagination hemisphere face upper edge plane of arrangement of revolving member is provided with and static pressure cavity, dynamic pressure cavity phase The annulus of corresponding evagination substantially reduces the hemispherical requirement on machining accuracy of evagination, to improve work efficiency, reduces Processing cost.

The above embodiment is the preferred case of the utility model, is not intended to limit the scope of protection of the utility model.

Claims (10)

1. a kind of dynamic and static pressure hemisphere bearing shafting, which is characterized in that including：

At least one dynamic and static pressure hemisphere bearing；And

Rotation axis is arranged in the dynamic and static pressure hemisphere bearing,

Wherein, the dynamic and static pressure hemisphere bearing has support base, accommodates component and rotating member,

The receiving component includes the receiving member with indent hemisphere face and outer surface, multiple static pressure bushings and multiple dynamic pressures lining Set,

The receiving member has multiple static pressure channels for by fluid and dynamic pressure channel, the static pressure channel and the dynamic pressure Channel is separately positioned in the inner wall of the receiving member and penetrates through the indent hemisphere face and the outer surface,

The static pressure channel includes that the first cavity to concave on the indent hemisphere face is arranged and is connected to first cavity With the static pressure duct of the outer surface,

The dynamic pressure channel includes that the second cavity to concave on the indent hemisphere face is arranged and is connected to second cavity With the dynamic pressure duct of the outer surface,

The static pressure bushing has a cylindrical static pressure cavity, static pressure lining be set on the opening of first cavity and Towards the indent hemisphere face, the bottom of the static pressure cavity is connected the static pressure cavity opening with first cavity,

There is the dynamic pressure bushing dynamic pressure cavity, the dynamic pressure lining to be set on the opening of second cavity and the dynamic pressure The opening of cavity is connected towards the indent hemisphere face, the bottom of the dynamic pressure cavity with second cavity, the dynamic pressure The cross section of cavity is gradually expanded from bottom to opening,

The rotating member has the evagination hemisphere face to match with the indent hemisphere face, is arranged in the indent hemisphere face,

There is the support base support base inner cavity to match with the outer surface of the receiving member, the receiving member to be arranged in the branch It supports intracavitary in seat and is interference fitted with the support base inner cavity,

It is respectively arranged at least one first passage being connected with the static pressure duct on the support base, and is moved with described At least one second channel that pressure duct is connected.

2. dynamic and static pressure hemisphere bearing shafting according to claim 1, it is characterised in that：

Wherein, multiple static pressure bushings and multiple dynamic pressure bushings are arranged along at least one plane of arrangement in the indent half On spherical surface, the plane of arrangement is the plane of the rotation axis perpendicular to the rotating member,

The quantity of the static pressure bushing is at least 3,

The quantity of the dynamic pressure bushing is at least 3.

3. dynamic and static pressure hemisphere bearing shafting according to claim 2, it is characterised in that：

Wherein, the static pressure cavity is in the form of a column, the shape of accent be round, ellipse, square, rectangle and it is trapezoidal in appoint Meaning is a kind of,

The dynamic pressure cavity along the plane of arrangement section in crescent or along the plane of arrangement section both ends be in wedge Shape, the shape of the dynamic pressure cavity accent be round, ellipse, square, rectangle and it is trapezoidal in any one.

4. dynamic and static pressure hemisphere bearing shafting according to claim 2, it is characterised in that：

Wherein, in the same plane of arrangement, multiple first cavitys and multiple second cavitys are uniform alternatings It is arranged on the indent hemisphere face,

Also be evenly arranged with a plurality of isolation channel on the indent hemisphere face, the isolation channel be located at adjacent two it is described first recessed Between chamber and second cavity, the elongated end of the isolation channel is intersected on the rotation axis of the rotating member,

The groove width of the isolation channel be 2-4mm, depth 2-5mm,

The indent hemisphere face and the hemispherical surface of the evagination are both provided with corrosion-inhibiting coating.

5. dynamic and static pressure hemisphere bearing shafting according to claim 1, it is characterised in that：

Wherein, the top end face of the static pressure bushing is higher than the indent hemisphere face,

The top end face of the dynamic pressure bushing is higher than the indent hemisphere face.

6. dynamic and static pressure hemisphere bearing shafting according to claim 1, it is characterised in that：

Wherein, the top end face of the static pressure bushing be with the indent hemisphere face coincide arcwall face and with the indent hemisphere face It coincide,

The top end face of the dynamic pressure bushing is the arcwall face coincideing with the indent hemisphere face and coincide with the indent hemisphere face.

7. dynamic and static pressure hemisphere bearing shafting according to claim 1, it is characterised in that：

Wherein, the static pressure bushing is to be fixedly connected or be detachably connected with the receiving member,

The dynamic pressure bushing is to be fixedly connected or be detachably connected with the receiving member.

8. dynamic and static pressure hemisphere bearing shafting according to claim 5 or 6, it is characterised in that：

Wherein, the depth of the indent of the static pressure cavity is 0.5-5mm,

The static pressure cavity total surface area accounts for the 20-60% of the indent hemisphere face total surface area,

The depth of the indent of the dynamic pressure cavity is 4-8mm, and the dynamic pressure cavity total surface area accounts for the indent hemisphere face summary table The 20-60% of area,

Gap-ratio is 2-2.5, and the expression formula of the gap-ratio is h2/h1,

H2 is bottom and the hemispherical distance of the evagination of the dynamic pressure cavity, top end faces and institute of the h1 for the dynamic pressure bushing State the hemispherical distance of evagination.

9. a kind of precision machine tool uses the dynamic and static pressure hemisphere bearing shafting described in any one of claim 1-7, feature It is：

Wherein, the rotation axis is the workpiece rotary shaft or tool rotating shaft in the precision machine tool.

10. precision machine tool according to claim 9, it is characterised in that：

Wherein, the precision machine tool is any one in lathe, grinding machine, boring machine, milling machine.