CN108119544A - A kind of dynamic pressure hemisphere revolute pair - Google Patents
A kind of dynamic pressure hemisphere revolute pair Download PDFInfo
- Publication number
- CN108119544A CN108119544A CN201711402606.8A CN201711402606A CN108119544A CN 108119544 A CN108119544 A CN 108119544A CN 201711402606 A CN201711402606 A CN 201711402606A CN 108119544 A CN108119544 A CN 108119544A
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- Prior art keywords
- dynamic pressure
- cavity
- hemisphere
- revolute pair
- indent
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
Abstract
Dynamic pressure hemisphere revolute pair according to the present invention, including accommodating component and rotating member, accommodating component includes receiving member and multiple dynamic pressure bushings, receiving member has multiple dynamic pressure passages, dynamic pressure passage is arranged in the inner wall of receiving member and penetrates through indent hemisphere face and outer surface, dynamic pressure passage includes being arranged on the first cavity to concave on indent hemisphere face and the dynamic pressure duct for connecting the first cavity and outer surface, dynamic pressure bushing has dynamic pressure cavity, dynamic pressure bushing is arranged on the opening of the opening of the first cavity and dynamic pressure cavity towards indent hemisphere face, the bottom of dynamic pressure cavity is connected with the first cavity, the cross section of dynamic pressure cavity is gradually widened from bottom to opening.Dynamic pressure hemisphere revolute pair according to the present invention, during working condition, it is not in contact with each other during convex ball rotation with concave spherical surface, compared with dynamic pressure cone revolute pair, dynamic pressure hemisphere revolute pair has better concentric fit degree, therefore the dynamic rotary precision of revolute pair upper rotary shaft can be improved using gas or Liquid Static-Press Technique.
Description
Technical field
The invention belongs to machinery fields, and in particular to a kind of dynamic pressure hemisphere revolute pair.
Background technology
It is contact condition when the conventional rotary pair of the prior art rotates mostly, rotation precision and efficiency is not high.
The bearing combined using gas or Liquid Static-Press Technique with sphere structure is that current raising main shaft running accuracy is effective
One of approach.
According to gas (air) or liquid (fluid) dynamic pressure technology basic principle, liquid or gas medium have respectively entered ball
In multiple chambers of body bearing concave spherical surface, as long as making required inclined wedge in cavity and thering is sufficient gas or liquid to be situated between
Matter just generates dynamic pressure after convex ball rotation, convex ball is floated, and can bear the effect of external applied load, and the gap of concave, convex ball is got over
Small, speed and Media density are higher, and dynamic pressure is bigger.But the machining accuracy of the concave, convex ball of the sphere bearing, chamber and spherical surface
It is very high with processing cost.
The content of the invention
The present invention is to carry out to solve the above-mentioned problems, and it is an object of the present invention to provide a kind of smart to concave spherical surface and chamber process
It spends of less demanding, the dynamic pressure hemisphere revolute pair of processing cost can be reduced.
The present invention provides a kind of dynamic pressure hemisphere revolute pairs, have the feature that, including accommodating component, including having
The receiving member and multiple dynamic pressure bushings of indent hemisphere face and outer surface；And rotating member, have outer with the matching of indent hemisphere face
Convex hemisphere face is arranged in indent hemisphere face, wherein, receiving member has multiple dynamic pressure passages for being used to pass through fluid, and dynamic pressure is led to
Road is arranged in the inner wall of receiving member and penetrates through indent hemisphere face and outer surface, and dynamic pressure passage includes being arranged on indent hemisphere face
The first cavity to concave and the dynamic pressure duct for connecting the first cavity and outer surface, dynamic pressure bushing have dynamic pressure cavity, dynamic pressure lining
The opening of the opening of the first cavity and dynamic pressure cavity is set on towards indent hemisphere face, the bottom of dynamic pressure cavity and first
Cavity is connected, and the cross section of dynamic pressure bushing cavity is gradually widened from bottom to opening.
In static pressure hemisphere revolute pair provided by the invention, it can also have the feature that：Wherein, multiple first is recessed
Chamber is arranged on along at least one plane of arrangement on indent hemisphere face, and plane of arrangement is the plane perpendicular to pivot centre line.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, first
The quantity of cavity is at least 3.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, dynamic pressure
Cavity along the section of plane of arrangement in the both ends of crescent or section along the plane of arrangement wedge shaped, the shape of dynamic pressure cavity mouth
Shape is circular, ellipse, square, rectangle and it is trapezoidal in any one.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, indent
A plurality of isolation channel is also evenly arranged on hemisphere face, isolation channel is between two adjacent the first cavitys, the extension of isolation channel
End is intersected on the rotation axis of rotating member, and the groove width of isolation channel is 2-4mm, depth 2-5mm, indent hemisphere face and outer
Corrosion-inhibiting coating is both provided on convex hemisphere face.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, dynamic pressure
The top end face of bushing is higher than indent hemisphere face.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, dynamic pressure
The top end face of bushing is the arcwall face coincideing with indent hemisphere face and matches with indent hemisphere face.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, dynamic pressure
Bushing is to be fixedly connected or be detachably connected with receiving member.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, rotate
The annulus with the annular groove of the corresponding indent of dynamic pressure cavity or evagination is provided with along plane of arrangement on the evagination hemisphere face of component.
In addition, in dynamic pressure hemisphere revolute pair provided by the invention, can also have the feature that：Wherein, dynamic pressure
The hollow depth of cavity is 4-8mm, and dynamic pressure cavity total surface area accounts for the 40-60% of indent hemisphere face total surface area, gap-ratio
For 2-2.5, the expression formula of gap-ratio is h2/h1, and h2 is the bottom of dynamic pressure cavity and the hemispherical distance of evagination, and h1 is dynamic pressure
The top end face of bushing and the hemispherical distance of evagination.
The effect of invention
Involved dynamic pressure hemisphere revolute pair according to the present invention, including accommodating component and rotating member, accommodating component includes
Receiving member and multiple dynamic pressure bushings with indent hemisphere face and outer surface, receiving member have multiple dynamic pressures being used for through fluid
Passage, dynamic pressure passage are arranged in the inner wall of receiving member and penetrate through indent hemisphere face and outer surface, and dynamic pressure passage includes being arranged on
The first cavity to concave on indent hemisphere face and the dynamic pressure duct for connecting the first cavity and outer surface, dynamic pressure bushing have dynamic pressure
Cavity, dynamic pressure bushing are arranged on the opening of the opening of the first cavity and dynamic pressure cavity towards indent hemisphere face, dynamic pressure cavity
Bottom be connected with the first cavity, the cross section of dynamic pressure cavity is gradually widened from bottom to opening.
Involved dynamic pressure hemisphere revolute pair according to the present invention, during working condition, during convex ball rotation with concave spherical surface mutually not
Contact, is in gas or state of liquid friction, in this way, the system of the pivot jerk value μ and concave-convex ball during convex ball rotation always
Error to be made to be 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, jump during convex ball rotation
Momentum is the 1/5-1/10 of concave-convex ball deviation from circular from amount, and compared with dynamic pressure cone revolute pair, dynamic pressure hemisphere revolute pair has more
Good concentric fit degree, therefore use gas or Liquid Static-Press Technique that can improve the dynamic rotary precision of revolute pair upper rotary shaft,
Reach 0.1-1.0 μm.
In addition, 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 in recessed spherical cavity room
The medium of viscosity, smaller gap to form inclined wedge (wedge point towards the direction of rotation of convex ball), possesses between recessed ball and convex ball
These 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
Pressure is not generated, rotating speed is higher, Media density is higher, concave-convex sphere gap is smaller, and dynamic pressure is bigger.
It is arranged on after being due to dynamic pressure bushing on indent hemisphere face, the processing of the dynamic pressure cavity of bushing can individually add
Work, therefore difficulty of processing substantially reduces, and so as to improve the work efficiency of dynamic pressure cavity processing, reduces processing cost.
Description of the drawings
Fig. 1 is dynamic pressure hemisphere revolute pair schematic diagram in the embodiment of the present invention；
Fig. 2 is receiving member sectional view in the embodiment of the present invention；
Fig. 3 is B direction views in Fig. 2；And
Fig. 4 be in Fig. 1 part A in the section view enlarged diagram of plane of arrangement.
Specific embodiment
It is real below in order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention
Example combination attached drawing is applied to be specifically addressed the dynamic pressure hemisphere revolute pair of the present invention.
Embodiment one
As shown in Figure 1, dynamic pressure hemisphere revolute pair 100 includes accommodating component 10 and rotating member 20.
Accommodating component 10 includes receiving member 11 and multiple dynamic pressure bushings 12.
As shown in Fig. 2, receiving member 11 includes indent hemisphere face 111, outer surface 112, multiple dynamic pressure passages 113 and through hole
114。
And some be not required axis by occasion, receiving member 11 can be not provided with through hole 114.In the present embodiment, accommodate
Part 11 111 center of indent hemisphere face it is horizontally arranged be useful for axis by through hole 114, receiving member 11 use made of metal
Into.
Dynamic pressure passage 113 is arranged in the inner wall of receiving member 11 and penetrates through indent hemisphere face 111 and outer surface 112, dynamic pressure
Passage 113 includes being arranged on the first cavity 113a to concave on indent hemisphere face 111 and connects the first cavity 113a and appearance
The dynamic pressure duct 113b in face 112, dynamic pressure passage 113 are used for through fluid, the dynamic pressure duct that external fluid passes through outer surface
113b enters recessed hemisphere face 111.In the present embodiment, which is liquid oil, and the first cavity 113a is cylindrical.
As shown in figure 4, dynamic pressure bushing 12 has dynamic pressure cavity 121, dynamic pressure bushing 12 is arranged on opening for the first cavity 113a
At mouthful and the opening of dynamic pressure cavity 121 is towards indent hemisphere face 111, and the bottom of dynamic pressure cavity 121 is connected with the first cavity 113a
Logical, the cross section of dynamic pressure cavity 121 is gradually widened from bottom to opening, and multiple first cavity 113a are along at least one arrangement
Plane is arranged on indent hemisphere face 111, and plane of arrangement is the plane perpendicular to 20 rotation axis of rotating member, in embodiment, is turned
20 rotation axis of moving part is horizontal line, and plane of arrangement is 2, and the quantity of dynamic pressure cavity 121 is 16, in each plane of arrangement
The quantity of dynamic pressure cavity 121 is 8.
As shown in Figure 2 and Figure 3, multiple dynamic pressure bushings 12 are arranged on 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, 20 rotation axis of rotating member is horizontal line, is arranged
Plane is 2, and the quantity of dynamic pressure bushing 12 is 16, and the quantity of the dynamic pressure bushing 12 in each plane of arrangement is 8.
As shown in Figure 1, 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 of rotating member 20 and the axis collinear of indent hemisphere face 111 between concave, convex spherical surface, turn
The rotation in indent hemisphere face 111 around horizontal axis of moving part 20, as the dynamic pressure duct 113b that external liquid oil passes through outer surface
During by dynamic pressure bushing 12 into recessed hemisphere face 111, rotating member 20 floats, and contactless state is in during rotation.
In embodiment, rotating member 20 be provided in the horizontal direction with through hole 114 match for axis by through hole.
Embodiment two
The present embodiment other structures are identical with embodiment one, the difference is that the shape of 121 accent of dynamic pressure cavity is circular, ellipse
Circular, square, rectangle and it is trapezoidal in any one.The section of dynamic pressure cavity 121 along plane of arrangement is in crescent or edge
The both ends of the section of plane of arrangement are wedge shaped,
The shape of 121 accent of dynamic pressure cavity is trapezoidal in embodiment two, and the section along plane of arrangement is in crescent.
Embodiment three
The present embodiment other structures are identical with embodiment two, the difference is that the depth to concave of dynamic pressure cavity 121 is 4-
8mm, 121 total surface area of dynamic pressure cavity account for the 40-60% of indent hemisphere face total surface area.
Example IV
As shown in figure 4, the present embodiment other structures are identical with embodiment three, the difference is that the top end face of dynamic pressure bushing 12 is
It the arcwall face that coincide with indent hemisphere face and matches with indent hemisphere face, gap-ratio 2-2.5, the expression formula of gap-ratio is
H2/h1, h2 are the bottom of dynamic pressure cavity and the hemispherical distance of evagination, and h1 is hemispherical for the top end face and evagination of dynamic pressure bushing
Distance.When gap-ratio is 2.2, bearing capacity is maximum.It is according to the material of load, rotating speed, the viscosity of oil, axis and bearing and adds
The factors such as work precision determine.
Example IV intermediate gap ratio is 2.2.
Embodiment five
The present embodiment other structures are identical with embodiment three, the difference is that the top end face of dynamic pressure bushing 12 is higher than indent hemisphere
Face 111, 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 of dynamic pressure bushing and the hemispherical distance of evagination.When gap-ratio is 2.2, bearing capacity is maximum.Its basis
The factors such as load, rotating speed, the viscosity of oil, the material of axis and bearing and machining accuracy determine.
In embodiment five, the top end face of dynamic pressure bushing 12 is higher than the distance of indent hemisphere face 11 for 0.5mm, and gap-ratio is
2.2, the depth of the indent of dynamic pressure cavity 121 is 2mm, and the total surface area of dynamic pressure cavity 121 accounts for 111 total surface area of indent hemisphere face
45%.
The axial section or stairstepping of dynamic pressure bushing 12.
Embodiment six
The other structures of the present embodiment are identical with embodiment five, the difference is that 12 and first cavity 113a of dynamic pressure bushing is solid
Fixed connection.
Dynamic pressure bushing 12 and the first cavity 113a are the mode that is fixedly connected using Nian Jie or be interference fitted, in embodiment six
Dynamic pressure bushing 12 is with the mode of the first cavity 113a connections using Nian Jie.
Embodiment seven
The other structures of the present embodiment are identical with embodiment five, the difference is that 12 and first cavity 113a of dynamic pressure bushing is can
Dismantling connection.
Dynamic pressure bushing 12 is connected with the mode that the first cavity 113a is connected using screw in embodiment seven.
Embodiment eight
The other structures of the present embodiment are identical with embodiment seven, the difference is that being provided with anti-corrosion painting on indent hemisphere face 111
Layer.
Corrosion-inhibiting coating in embodiment eight is nano ceramics.
Embodiment nine
As shown in figure 3, the other structures of the present embodiment are identical with embodiment five, the difference is that also equal on indent hemisphere face 11
Even to be provided with a plurality of isolation channel 115, isolation channel 115 is between two adjacent the first cavity 113a, the extension of isolation channel 115
End is intersected on the rotation axis of revolving member, and the groove width of isolation channel 14 is 2-4mm, depth 2-5mm.
The groove width of isolation channel 115 is 2.5mm in embodiment nine, and depth 2mm, quantity is 8.
Embodiment ten
The other structures of the present embodiment are identical with example IV, the difference is that edge on the evagination hemisphere face 21 of revolving member 20
Plane of arrangement is provided with 2 annular grooves 211 with 121 corresponding indent of dynamic pressure cavity.
Embodiment 11
The other structures of the present embodiment are identical with example IV, the difference is that edge on the evagination hemisphere face 21 of revolving member 20
Plane of arrangement is provided with 2 annulus 211 with 121 corresponding evagination of dynamic pressure cavity.
Embodiment 12
The other structures of the present embodiment are identical with embodiment seven, the difference is that being provided with anti-corrosion painting on evagination hemisphere face 21
Layer.
Corrosion-inhibiting coating in embodiment 12 is anti-decaying paint.
The effect of embodiment
Static pressure hemisphere revolute pair according to involved by the present embodiment, when convex ball rotation are not in contact with each other with recessed ball, locate always
In gas or state of liquid friction, in this way, the foozle of the pivot jerk value and concave-convex ball during convex ball rotation is not straight
Relation is connect, 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 during convex ball rotation is concave-convex ball
The 1/5-1/10 of deviation from circular from amount, therefore main shaft dynamic rotary precision can be improved using gas or Liquid Static-Press Technique.
In addition, bushing is arranged on after being on indent hemisphere face, the difficulty of processing requirement of bushing cavity substantially reduces, so as to
The work efficiency of bushing cavity processing is improved, reduces processing cost.
Further, the top of bushing is higher than indent hemisphere face, and the hemispherical requirement on machining accuracy of indent is not high, has and carries
High workload efficiency reduces the effect of indent hemisphere face processing cost.
Further, bushing is connected with receiving component to be adhesively fixed, and is had the characteristics that easy to process.
Further, the ring with the corresponding evagination of bushing is provided on the evagination hemisphere face of revolving member along plane of arrangement
Band substantially reduces the hemispherical requirement on machining accuracy of evagination, so as to improve work efficiency, reduces processing cost.
The above embodiment is the preferred case of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. a kind of dynamic pressure hemisphere revolute pair, which is characterized in that including：
Component is accommodated, including the receiving member with indent hemisphere face and outer surface and multiple dynamic pressure bushings；And
Rotating member has the evagination hemisphere face to match with the indent hemisphere face, is arranged in the indent hemisphere face,
Wherein, the receiving member has multiple dynamic pressure passages for being used to pass through fluid, and the dynamic pressure passage is arranged on the receiving
In the inner wall of part and penetrate through the indent hemisphere face and the outer surface,
The dynamic pressure passage includes being arranged on the first cavity to concave on the indent hemisphere face and connects first cavity
With the dynamic pressure duct of the outer surface,
The dynamic pressure bushing has dynamic pressure cavity, and the dynamic pressure bushing is arranged on the opening of first cavity and the dynamic pressure
The opening of cavity is connected towards the indent hemisphere face, the bottom of the dynamic pressure cavity with first cavity, described dynamic
The cross section of indentation chamber is gradually widened from bottom to opening.
2. dynamic pressure hemisphere revolute pair according to claim 1, it is characterised in that：
Wherein, multiple dynamic pressure bushings are arranged on along at least one plane of arrangement on the indent hemisphere face, the cloth horizontalization
Face is the plane perpendicular to the pivot centre line.
3. dynamic pressure hemisphere revolute pair according to claim 2, it is characterised in that：
Wherein, the quantity of first cavity is at least 3.
4. dynamic pressure hemisphere revolute pair according to claim 2, it is characterised in that：
Wherein, the section of the dynamic pressure cavity along the plane of arrangement is in the both ends of crescent or the section along the plane of arrangement
It is wedge shaped,
The shape of the dynamic pressure cavity mouth is circular, ellipse, square, rectangle and it is trapezoidal in any one.
5. dynamic pressure hemisphere revolute pair according to claim 2, it is characterised in that：
Wherein, a plurality of isolation channel is also evenly arranged on the indent hemisphere face, the isolation channel is located at described in adjacent two
Between first 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 is 2-4mm, depth 2-5mm.
6. dynamic pressure hemisphere revolute pair according to claim 4, it is characterised in that：
Wherein, the top end face of the dynamic pressure bushing is higher than the indent hemisphere face.
7. dynamic pressure hemisphere revolute pair according to claim 4, it is characterised in that：
Wherein, the top end face of the dynamic pressure bushing be the arcwall face that coincide with the indent hemisphere face and with the indent hemisphere face
It matches.
8. the dynamic pressure hemisphere revolute pair according to claim 6 or 7, it is characterised in that：
Wherein, the hollow depth of the dynamic pressure cavity is 4-8mm, and the dynamic pressure cavity total surface area accounts for the indent hemisphere face
The 40-60% of total surface 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. dynamic pressure hemisphere revolute pair according to claim 1, it is characterised in that：
Wherein, the dynamic pressure bushing is to be fixedly connected or be detachably connected with the receiving member.
10. dynamic pressure hemisphere revolute pair according to claim 2, it is characterised in that：
Wherein, it is provided on the evagination hemisphere face of the revolving member along the plane of arrangement corresponding with the dynamic pressure cavity
The annular groove of indent or the annulus of evagination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711402606.8A CN108119544A (en) | 2017-12-22 | 2017-12-22 | A kind of dynamic pressure hemisphere revolute pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711402606.8A CN108119544A (en) | 2017-12-22 | 2017-12-22 | A kind of dynamic pressure hemisphere revolute pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108119544A true CN108119544A (en) | 2018-06-05 |
Family
ID=62230947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711402606.8A Withdrawn CN108119544A (en) | 2017-12-22 | 2017-12-22 | A kind of dynamic pressure hemisphere revolute pair |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108119544A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2738400A1 (en) * | 1977-08-25 | 1979-03-01 | Hohenzollern Huettenverwalt | MACHINE TOOL WITH HYDROSTATICALLY MOUNTED FINE TURNING SPINDLE |
| CN202479959U (en) * | 2012-03-14 | 2012-10-10 | 吴怀超 | Hybrid bearing of high-speed roll grinder wheelhead |
-
2017
- 2017-12-22 CN CN201711402606.8A patent/CN108119544A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2738400A1 (en) * | 1977-08-25 | 1979-03-01 | Hohenzollern Huettenverwalt | MACHINE TOOL WITH HYDROSTATICALLY MOUNTED FINE TURNING SPINDLE |
| CN202479959U (en) * | 2012-03-14 | 2012-10-10 | 吴怀超 | Hybrid bearing of high-speed roll grinder wheelhead |
Non-Patent Citations (1)
| Title |
|---|
| 机械设计手册编委会编: "《机械设计手册 单行本 滑动轴承》", 31 March 2007, 机械工业出版社 * |
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Application publication date: 20180605 |
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