CN104520600A - Aerostatic radial bearing - Google Patents
Aerostatic radial bearing Download PDFInfo
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- CN104520600A CN104520600A CN201380041376.0A CN201380041376A CN104520600A CN 104520600 A CN104520600 A CN 104520600A CN 201380041376 A CN201380041376 A CN 201380041376A CN 104520600 A CN104520600 A CN 104520600A
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- metal powder
- sintered layer
- powder sintered
- layer segment
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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
- F16C32/0603—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 supported by a gas cushion, e.g. an air cushion
- F16C32/0614—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 supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings
- F16C32/0618—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 supported by a gas cushion, e.g. an air cushion the gas being supplied under pressure, e.g. aerostatic bearings via porous material
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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
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C33/122—Multilayer structures of sleeves, washers or liners
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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
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
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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
- F16C2202/00—Solid materials defined by their properties
- F16C2202/02—Mechanical properties
- F16C2202/10—Porosity
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Powder Metallurgy (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Provided is an aerostatic radial bearing with which a compressed gas can be uniformly discharged from the entire bearing surface, and with which a high contraction effect can be obtained. This aerostatic radial bearing (1A) is equipped with: a cylindrical first metal powder sintered layer part (2A), the inner circumferential surface (21) of which is a bearing surface; a second metal powder sintered layer (3) formed on the outer circumferential surface (22) of the first metal powder sintered layer part (2A) and having a higher porosity than that of the first metal powder sintered layer part (2A); and a back metal (4) formed on the outer circumferential surface (32) of the second metal powder sintered layer (3). A bead-type bronze alloy powder for which the average grain diameter is substantially the same is used as the material for forming the first and second metal powder sintered layer parts (2A, 3). The second metal powder sintered layer part (3) is arranged within a metal sleeve, with the first metal powder sintered layer part (2A) as a core, and the gap between this core and the sleeve is filed with the bead-type bronze alloy powder, and sintering is performed at a lower temperature and for a shorter time than for the first metal powder sintered layer (2A), thus making the porosity higher than that of the metal powder sintered layer (2A).
Description
Technical field
The present invention relates to supporting in a non-contact manner as the pressurized air radial bearing of radial load of rotating body treating supporting object, and relate to the pressurized gas that can discharge equably from the whole surface of bearing surface particularly and the pressurized air radial bearing of higher restriction can be obtained.
Background technique
Patent document 1 discloses a kind of hydrostatic gas-lubricated bearing, and described hydrostatic gas-lubricated bearing the adjustment of pin-point accuracy ground can be formed at the size of hole in bearing surface and distribution and can limit the release of the gas from bearing surface.
This hydrostatic gas-lubricated bearing has double layer construction, in described double layer construction, porous material surface limiting layer as the bronze powder sintering body with 5 μm of average particulate diameters is bonded to the base component of porous material, and the base component of described porous material is the bronze powder sintering body with 60 μm of average particulate diameters.As production method, first by performing first sintering technique and make base component on the bronze powder with 60 μm of average particulate diameters.Secondly, make bonding surface become the surface of surface-limited layer by processing and complete base component.
Again, base component be placed on there are 5 μm of average particulate diameters bronze powder (its be filled in container and become surface-limited layer) on, thus the surface making bonding surface become the base material of surface-limited layer is placed, and perform second time sintering process downwards.Therefore, the hydrostatic gas-lubricated bearing of the bilayer sintering body with base component and surface-limited layer is defined.
Reference listing
Patent document
Patent document 1: Japan does not check the open No.2000-27865 of patent application.
Summary of the invention
Technical problem
But the hydrostatic gas-lubricated bearing described in patent document 1 is the board-like bearing being used as thrust-bearing, and the bushing bearing that patent document 1 does not have consideration to be applied to as radial bearing.In addition, because the bronze powder with different average particulate diameter is respectively applied for base component and surface-limited layer, therefore, the management of material and purchase cost become higher.In addition, base component is formed by tentatively sintering the bronze powder forming base component, be formed in the surface-limited layer on base component subsequently by the bronze powder of sintering formation surface-limited layer, therefore need two-step sintering technique, and cost of production improve.Therefore, overall cost is further improved.
The present invention has considered above-mentioned situation.Object of the present invention is for providing a kind of pressurized air radial bearing, and described pressurized air radial bearing can discharge the pressurized gas on the whole surface from bearing surface equably, and can obtain higher restriction.Another object of the present invention can with the pressurized air radial bearing of low-cost production for providing.
Solution
In order to solve the problem, according to a first aspect of the invention, inner circumferential surface is that the metal powder sintered layer segment of tubulose first of bearing surface is placed as the core in tubular die, and metallic dust is filled in the gap between core and mould subsequently, and sintering is performed.As a result, the second metal powder sintered layer segment with more high porosity compared with layer segment metal powder sintered with first is formed on the external peripheral surface of the first metal powder sintered layer segment.Therefore, define pressurized air radial bearing, described pressurized air radial bearing has the second metal powder sintered layer segment of more high porosity compared with layer segment metal powder sintered with first.
Such as, a first aspect of the present invention provides a kind of pressurized air radial bearing, and the bearing surface of described pressurized air radial bearing supports the radial load as waiting the rotating body supporting object in a non-contact manner, and described pressurized air radial bearing comprises:
The metal powder sintered layer segment of tubulose first, the inner circumferential surface of the metal powder sintered layer segment of described tubulose first is bearing surface; And
Second metal powder sintered layer segment, described second metal powder sintered layer segment is formed on the external peripheral surface of the first metal powder sintered layer segment, and has porosity ratio higher compared with layer segment metal powder sintered with first, wherein:
The first metal powder sintered layer segment is formed by performing first sintering; And
By the first metal powder sintered layer segment to be placed as the core in tubular die and by metallic dust to be filled in the gap between core and mould and subsequently by performing second time sintering, formation the second metal powder sintered layer segment.
Herein, the metallic dust that average particulate diameter is almost identical can be respectively applied for the first and second metal powder sintered layer segments.Subsequently, the second metal powder sintered layer segment is sintered under second time sintering condition, and described second time sintering condition comprises temperature lower compared with the first sintering condition for the first metal powder sintered layer segment and shorter time.
According to a second aspect of the invention, the tubulose green compact of the mixed-powder containing electrolytic copper powder and tin powder are placed as the core in tubular die.Bell metal spherical powder is filled in the gap between core and mould, and sintering is performed subsequently.As a result, form pressurized air radial bearing, comprising: the metal powder sintered layer segment of tubulose first, the inner circumferential surface of the metal powder sintered layer segment of described tubulose first is bearing surface; And the second metal powder sintered layer segment, the external peripheral surface that described second metal powder sintered layer segment is formed at the first metal powder sintered layer segment has a porosity ratio higher compared with layer segment metal powder sintered with first.
Such as, a second aspect of the present invention provides a kind of pressurized air radial bearing, and the bearing surface of described pressurized air radial bearing supports the radial load as waiting the rotating body supporting object in a non-contact manner, and described pressurized air radial bearing comprises:
The metal powder sintered layer segment of tubulose first, the inner circumferential surface of the metal powder sintered layer segment of described tubulose first is bearing surface; And
Second metal powder sintered layer segment, described second metal powder sintered layer segment is formed on the external peripheral surface of the first metal powder sintered layer segment, and has porosity ratio higher compared with layer segment metal powder sintered with first, wherein:
By the tubulose green compact of the mixed-powder containing electrolytic copper powder and tin powder are placed as the core in tubular die, and bell metal spherical powder is filled in the gap between core and mould, and perform sintering subsequently, together form the first and second metal powder sintered layer segments.
In in first and second, metal sleeve can be used as tubular die, to make sleeve as back pad metal.Or forming blocks can be used as tubular die, to form the body of layering in advance, the body of described layering comprises the first metal powder sintered layer segment and the second metal powder sintered layer segment.After this, the body of layering is pressed in metal sleeve, to make sleeve as back pad metal.
Invention advantage function
According to the present invention, the tubulose green compact of the first metal powder sintered layer segment or the mixed-powder containing electrolytic copper powder or tin powder are used as core.This core is placed in tubular die, and metallic dust is filled in the gap between core and mould, and sintering is performed subsequently.Result, the second metal powder sintered layer segment with more high porosity compared with the metal powder sintered layer segment of tubulose first is formed on the external peripheral surface of the first metal powder sintered layer segment, and the inner circumferential surface of the metal powder sintered layer segment of described tubulose first is bearing surface.Therefore, the pressurized gas that can discharge equably from the whole region of bearing surface can be provided and the pressurized air radial bearing of higher restriction can be obtained.
In addition, in the present invention, when the metallic dust with almost identical average particulate diameter is used to the first and second metal powder sintered layer segments and the second metal powder sintered layer segment is formed under the second time sintering condition having lower temperature and shorter time compared with the first sintering condition for the first metal powder sintered layer segment, identical material can be used to the first and second metal powder sintered layer segments.Therefore, it is possible to reduce management and the purchase cost of material, and therefore, it is possible to low-cost production pressurized air radial bearing.
In addition, in the present invention, when in the gap that the green compact of the mixed-powder containing electrolytic copper powder or tin powder are placed in core in tubular die and bell metal spherical powder is filled between core and mould and when performing sintering to form the first and second metal powder sintered layer segments, once sinteredly side by side can form the first and second metal powder sintered layer segments, and not need cylindrical core for forming the through hole of object wherein inserting and need by supporting.Therefore, it is possible to reduction cost of production, and can with low-cost production pressurized air radial bearing.
Accompanying drawing explanation
Fig. 1 (A) is the external view of the pressurized air radial bearing 1A-1C according to the of the present invention first to the 3rd embodiment, Fig. 1 (B) is the anterior view of the pressurized air radial bearing 1A according to the first embodiment of the present invention, and Fig. 1 (C) is the A-A cross section view of the pressurized air radial bearing 1A shown in Fig. 1 (B);
The anterior view of the pressurized air radial bearing 1B that Fig. 2 (A) is the second embodiment of the present invention, Fig. 2 (B) is the B-B cross section view of the pressurized air radial bearing shown in Fig. 2 (A), and Fig. 2 (C) is the view for explaining the layout in mould; And
The anterior view of the pressurized air radial bearing 1C that Fig. 3 (A) is the third embodiment of the present invention, and Fig. 3 (B) is the C-C cross section view of the pressurized air radial bearing shown in Fig. 3 (A).
Embodiment
In following content, embodiments of the invention will be described with reference to the drawings.
Fig. 1 (A) is the external view of the pressurized air radial bearing 1A-1C according to the of the present invention first to the 3rd embodiment.
< first embodiment >
Currently the first embodiment of the present invention will be described.
The anterior view of the pressurized air radial bearing 1A that Fig. 1 (B) is the present embodiment, and Fig. 1 (C) is the A-A cross section view of the pressurized air radial bearing shown in Fig. 1 (B).
As shown in FIG., the pressurized air radial bearing 1A of the present embodiment comprises: the metal powder sintered layer segment 2A of cylindrical shape first, and the inner circumferential surface 21 of the metal powder sintered layer segment 2A of described cylindrical shape first is bearing surface; Be formed at the second metal powder sintered layer segment 3 on the external peripheral surface 22 of the first metal powder sintered layer segment 2A; Be formed at the back pad metal 4 on the external peripheral surface 32 of the second metal powder sintered layer segment 3.By this structure, pressurized air radial bearing 1A supports the radial load as waiting the rotating body supporting object in a non-contact manner.
First metal powder sintered layer segment 2A is made up of the porous body being obtained by sintered bronze alloy spherical powder.Such as, in order to form the through hole 11 in the first metal powder sintered layer segment 2A inside, cylindrical core is placed on the dead in line of the axis and shaping die that make core in cylindrical shape shaping die, is inserted in described through hole 11 by the rotating body supporting object as treating.Subsequently, have and expect that the bell metal spherical powder of average particulate diameter is filled in the gap between the external peripheral surface and the inner circumferential surface of shaping die of core, and pressurized and subsequently by first sintering, to make the first metal powder sintered layer segment 2A.Now, the condition of adjustment first sintering, such as sintering temperature, sintering time etc., become such as 10% or lower to make the porosity ratio of the first metal powder sintered layer segment 2A.
Second metal powder sintered layer segment 3 is made up of porous body, and the bell metal spherical powder that described porous body has the substantially identical average particulate diameter of layer segment 2A metal powder sintered with first by sintering obtains.Such as, the metal powder sintered layer segment 2A of cylindrical shape first is used as core, and to be placed on core as in the cylindrical metal sleeve that mould uses, and coincides with one another to make their axis.Bell metal spherical powder is filled in the gap between the external peripheral surface and the inner circumferential surface of sleeve of core.Subsequently, core, the bell metal spherical powder be filled and sleeve all together carry out second time sintering.As a result, the second metal powder sintered layer segment 3 is formed on the external peripheral surface 22 of the first metal powder sintered layer segment 2A, thus the metal powder sintered layer segment 2A of diffusion bonding to the first.Meanwhile, sleeve forms the back pad metal 4 on the external peripheral surface 32 of the second metal powder sintered layer segment 3, thus is diffused and is bonded to the second metal powder sintered layer segment 3.Now, the condition (such as sintering temperature, sintering time etc.) of second time sintering is set to the temperature lower than first sintering and short time, to make the porosity ratio of the second metal powder sintered layer segment 3 higher than the porosity ratio (such as, to make the porosity ratio of the second metal powder sintered layer segment 3 become 25% or more) of the first metal powder sintered layer segment 2A.
In this pressurized air radial bearing 1A, the pressurized gas being supplied to the external peripheral surface 32 of the second metal powder sintered layer segment 3 by air supply pump (not shown) via back pad metal 4 arrives the inner circumferential surface 31 of the second metal powder sintered layer segment 3 via the hole in the second metal powder sintered layer segment 3, and is supplied to the external peripheral surface 22 of the first metal powder sintered layer segment 2A.Subsequently, via the hole in the first metal powder sintered layer segment 2A, pressurized gas arrives bearing surface, the i.e. inner circumferential surface 21 of the first metal powder sintered layer segment 2A, and is discharged equably by the whole region from inner circumferential surface 21.As a result, pressurized gas layer is formed at bearing surface 21 and is inserted between the external peripheral surface of the rotating body (not shown) in the through hole 11 of pressurized air radial bearing 1A, and supports the radial load of this rotating body in a non-contact manner.Now, the porosity ratio (such as 10% or lower) of the first metal powder sintered layer segment 2A is less than the porosity ratio (such as 25% or higher) of the second metal powder sintered layer segment 3, and hole therefore in the second metal powder sintered layer segment 3 is as the restricted part of the flow passage of pressurized gas.Therefore, the pressurized gas discharged from the inner circumferential surface 21 of the first metal powder sintered layer segment 2A is limited, and the rate of release of pressurized gas is controlled.
In the pressurized air radial bearing 1A of the present embodiment, the bell metal spherical powder with the almost identical average particulate diameter determined by general measurement or computational methods (such as screening method) is used as the formation material of the first and second metal powder sintered layer segment 2A and 3.And, by sintered bronze alloy spherical powder under lower in temperature compared with the first sintering condition for the first metal powder sintered layer segment 2A and that the time is shorter second time sintering condition, define the second metal powder sintered layer segment 3, to make the porosity ratio of the second metal powder sintered layer segment 3 higher than the porosity ratio of the first metal powder sintered layer segment 2A.Therefore, the use for the same material of the first and second metal powder sintered layer segment 2A and 3 reduces management and the purchase cost of material, and therefore, it is possible to low-cost production pressurized air radial bearing 1A.
In addition, because metal sleeve is used as mould, so together back pad metal 4 can be formed with the second metal powder sintered layer segment 3.This reduces cost of production further.
In addition, for the first metal powder sintered layer segment 2A, sintering process is performed twice (first sintering and second time sintering).Therefore, in second time sintering process, first metal powder sintered layer segment 2A is diffused and is bonded to the second metal powder sintered layer segment 3, and meanwhile, further sintering the first metal powder sintered layer segment 2A and the porosity ratio of the first metal powder sintered layer segment 2A becomes lower.As a result, the pressurized gas discharged from the inner circumferential surface 21 of the first metal powder sintered layer segment 2A can efficiently be limited.Therefore, the pressurized gas of less amount can be realized consuming and there is the pressurized air radial bearing 1A of more high hardness.
In the present embodiment, first and second metal powder sintered layer segment 2A and 3 can be provided with sealing layer (not shown) at two end surface 23 and 33 place, so that prevent pressurized gas from leaking from two end surfaces 23 and 33 of the first and second metal powder sintered layer segment 2A and 3.
< second embodiment >
Next, second embodiment of the present invention will be described.
The anterior view of the pressurized air radial bearing 1B that Fig. 2 (A) is the present embodiment, and Fig. 2 (B) is the B-B cross section view of the pressurized air radial bearing 1B shown in Fig. 2 (A).In fig. 2, the part having the function identical with the pressurized air radial bearing 1A of the first embodiment shown in Figure 1 is endowed identical reference mark.
Be similar to the pressurized air radial bearing 1A of above-mentioned first embodiment, the pressurized air radial bearing 1B of the present embodiment supports the radial load as waiting the rotating body supporting object in a non-contact manner.
As shown in FIG., pressurized air radial bearing 1B comprises: the metal powder sintered layer segment 2B of cylindrical shape first, and the inner circumferential surface 21 of the metal powder sintered layer segment 2B of described cylindrical shape first is bearing surface; Be formed at the second metal powder sintered layer segment 3 on the external peripheral surface 22 of the first metal powder sintered layer segment 2B; Be formed at the back pad metal 4 on the external peripheral surface 32 of the second metal powder sintered layer segment 3.
As shown in Fig. 2 (C), the cylindrical shape green compact 5 be made up of the copper tin mixed-powder at least containing electrolytic copper powder and tin powder by sintering, form the first metal powder sintered layer segment 2B.Herein, with bell metal spherical powder unlike, electrolytic copper powder has the branches and leaves shape of allowing and being easy to solidify, and tin powder is softer than bell metal spherical powder.Therefore, cylindrical shape green compact 5 are obtained easily through the copper tin mixed-powder of pressing containing electrolytic copper powder and tin powder.
Second metal powder sintered layer segment 3 is made up of the porous body being obtained by sintered bronze alloy spherical powder.As shown in Fig. 2 (C), the cylindrical shape green compact 5 becoming the metal powder sintered layer segment 2B of cylindrical shape first are placed as the core in round metal cylindrical sleeve 7 (green compact 5 use as mould by it), coincide with one another to make their axis.Subsequently, the bell metal spherical powder 6 with expectation average particulate diameter is filled in the gap between the external peripheral surface and the inner circumferential surface of sleeve 7 of green compact 5.Subsequently, core, the bell metal spherical powder 6 be filled and sleeve 7 are all together accepted sintering.Therefore, by once sintered technique, green compact 5 are sintered to form the first metal powder sintered layer segment 2B, and the bell metal spherical powder 6 of meanwhile, having filled is sintered the second metal powder sintered layer segment 3 be formed on the external peripheral surface 22 of the first metal powder sintered layer segment 2B.And the second metal powder sintered layer segment 3 is diffused and is bonded to the first metal powder sintered layer segment 2B.In addition, sleeve 7 is formed in the back pad metal 4 on the external peripheral surface 32 of the second metal powder sintered layer segment 3, thus is diffused and is bonded to the second metal powder sintered layer segment 3.Herein, for the formation of the bell metal spherical powder of the second metal powder sintered layer segment 3 be the average particulate diameter with the porosity ratio that can at least make the porosity ratio of the second metal powder sintered layer segment 3 higher than the first metal powder sintered layer segment 2B use powder.Such as, when the porosity ratio of the first metal powder sintered layer segment 2B is 10% or lower, the average particulate diameter for the formation of the bell metal spherical powder of the second metal powder sintered layer segment 3 is chosen to be and makes the porosity ratio of the second metal powder sintered layer segment 3 become 25% or more.
In the pressurized air radial bearing 1B of said structure, the pressurized gas being supplied to the external peripheral surface 32 of the second metal powder sintered layer segment 3 by air supply pump (not shown) via back pad metal 4 arrives the inner circumferential surface 31 of the second metal powder sintered layer segment 3 via the hole in the second metal powder sintered layer segment 3, and is supplied to the external peripheral surface 22 of the first metal powder sintered layer segment 2B.Subsequently, via the hole in the first metal powder sintered layer segment 2B, pressurized gas arrives bearing surface, the i.e. inner circumferential surface 21 of the first metal powder sintered layer segment 2B, and is discharged equably by the whole region from inner circumferential surface 21.As a result, pressurized gas layer is formed at bearing surface 21 and is inserted between the rotating body (not shown) in the through hole 11 of pressurized air radial bearing 1B, and supports the radial load of rotating body in a non-contact manner.Now, the porosity ratio (such as 10% or lower) of the first metal powder sintered layer segment 2B is less than the porosity ratio (such as 25% or higher) of the second metal powder sintered layer segment 3, and hole therefore in the second metal powder sintered layer segment 3 is as the restricted part of the flow passage of pressurized gas.Therefore, the pressurized gas discharged from the inner circumferential surface 21 of the first metal powder sintered layer segment 2B is limited, and the rate of release of pressurized gas is controlled.
In the pressurized air radial bearing 1B of the present embodiment, the cylindrical shape green compact 5 be made up of the copper tin mixed-powder at least containing electrolytic copper powder and tin powder are placed as the core in cylindrical sleeve 7.Further, bell metal spherical powder 6 is filled in the gap between the external peripheral surface and the inner circumferential surface of sleeve 7 of green compact 5, to perform sintering.Therefore, once sinteredly synchronously can make the first and second metal powder sintered layer segment 2B and 3, thus be diffused and be bonded to each other.In addition, meanwhile, back pad metal 4 can be bonded to the external peripheral surface 32 of the second metal powder sintered layer segment 3.In addition, because by pressing the copper tin mixed-powder at least containing electrolytic copper powder and tin powder, the green compact 5 obtained are used as core, so there is no need to make the first metal powder sintered layer segment 2B be used as core in advance.Therefore, with the first embodiment unlike, the present embodiment only needs once sintered technique.Thus, cost of production can be further reduced compared with above-mentioned first embodiment.By so, pressurized air radial bearing 1B can be produced with much lower cost.
What be similar to above-mentioned first embodiment is, in the present embodiment, first and second metal powder sintered layer segment 2B and 3 can be provided with sealing layer (not shown) at two end surface 23 and 33 place, so that prevent pressurized gas from leaking from two end surfaces 23 and 33 of the first and second metal powder sintered layer segment 2B and 3.
< the 3rd embodiment >
Next, the third embodiment of the present invention will be described.
The anterior view of the pressurized air radial bearing 1C that Fig. 3 (A) is the present embodiment, and Fig. 3 (B) is the C-C cross section view of the pressurized air radial bearing 1C shown in Fig. 3 (A).In figure 3, the part having the function identical with the pressurized air radial bearing 1A of the first embodiment shown in Figure 1 is endowed identical reference mark.
The pressurized air radial bearing 1C of the present embodiment supports object to be supported in a non-contact manner, is similar to pressurized air radial bearing 1A and 1B of above-mentioned first embodiment and the second embodiment.
As shown in FIG., pressurized air radial bearing 1C comprises: the metal powder sintered layer segment 2C of cylindrical shape first, and the inner circumferential surface 21 of the metal powder sintered layer segment 2C of described cylindrical shape first is bearing surface; Be formed at the second metal powder sintered layer segment 3 on the external peripheral surface 22 of the first metal powder sintered layer segment 2C; Be formed at the back pad metal 4 on the external peripheral surface 32 of the second metal powder sintered layer segment 3.
First metal powder sintered layer segment 2C is made up of the porous body being obtained by sintered bronze alloy spherical powder.Such as, in order to form the through hole 11 in the first metal powder sintered layer segment 2C inside, cylindrical core is placed in cylindrical shape shaping die, to make their axis coincide with one another, as waiting that the rotating body supporting object is inserted in described through hole 11.Subsequently, have and expect that the bell metal spherical powder of average particulate diameter is filled in the gap between the external peripheral surface and the inner circumferential surface of mould of core, and accept first sintering, to make the first metal powder sintered layer segment 2C.Now, the condition of adjustment first sintering, such as sintering temperature, sintering time etc., become such as 10% or lower to make the porosity ratio of the first metal powder sintered layer segment 2C.
Second metal powder sintered layer segment 3 is by by sintering the bell metal spherical powder compared with the bell metal spherical powder for the first metal powder sintered layer segment 2C with larger average particulate diameter, the porous body obtained is made.Such as, the metal powder sintered layer segment 2C of cylindrical shape first is used as core, and to be positioned over this core as in the cylindrical metal sleeve that mould uses, and coincides with one another to make their axis.The bell metal spherical powder compared with the bell metal spherical powder for the first metal powder sintered layer segment 2C with larger average particulate diameter is filled in the gap between the external peripheral surface and the inner circumferential surface of sleeve of core.Subsequently, core, the bell metal spherical powder of filling compared with the bell metal spherical powder for the first metal powder sintered layer segment 2C with larger average particulate diameter and sleeve are all together accepted to sinter for the second time.As a result, the second metal powder sintered layer segment 3 is formed on the external peripheral surface 22 of the first metal powder sintered layer segment 2C, thus is diffused and is bonded to the first metal powder sintered layer segment 2C.Meanwhile, sleeve is formed in the back pad metal 4 on the external peripheral surface 32 of the second metal powder sintered layer segment 3, thus is diffused and is bonded to the second metal powder sintered layer segment 3.Now, for the bell metal spherical powder of the second metal powder sintered layer segment 3 be the bell metal spherical powder of the average particulate diameter with the porosity ratio that can at least make the porosity ratio of the second metal powder sintered layer segment 3 higher than the first metal powder sintered layer segment 2C.Such as, when the porosity ratio of the first metal powder sintered layer segment 2C is 10% or lower, the average particulate diameter of spherical bell metal is chosen to be and makes the porosity ratio of the second metal powder sintered layer segment 3 become 25% or more.
In the pressurized air radial bearing 1C of said structure, the pressurized gas being supplied to the external peripheral surface 32 of the second metal powder sintered layer segment 3 by air supply pump (not shown) via back pad metal 4 arrives the inner circumferential surface 31 of the second metal powder sintered layer segment 3 via the hole in the second metal powder sintered layer segment 3, and is supplied to the external peripheral surface 22 of the first metal powder sintered layer segment 2C.Subsequently, via the hole in the first metal powder sintered layer segment 2C, pressurized gas arrives bearing surface, the i.e. inner circumferential surface 21 of the first metal powder sintered layer segment 2C, and is discharged equably by the whole region from inner circumferential surface 21.As a result, pressurized gas layer is formed at bearing surface 21 and is inserted between the external peripheral surface of the rotating body (not shown) in the through hole 11 of pressurized air radial bearing 1C, and supports the radial load of rotating body in a contactless manner.Now, the porosity ratio (such as 10% or lower) of the first metal powder sintered layer segment 2C is less than the porosity ratio (such as 25% or higher) of the second metal powder sintered layer segment 3, and hole therefore in the first metal powder sintered layer segment 2C is as the restricted part of the flow passage of pressurized gas.Therefore, the pressurized gas discharged from inner circumferential surface 21 is limited, and the releasing quantity of pressurized gas is controlled.
In the pressurized air radial bearing 1C of the present embodiment, because metal sleeve is used as mould, so together back pad metal 4 can be formed with the second metal powder sintered layer segment 3.This reduces cost of production further.
In addition, the bell metal spherical powder compared with the bell metal spherical powder of the formation material as the first metal powder sintered layer segment 2C with larger average particulate diameter is used as the formation material of the second metal powder sintered layer segment 3.Average particulate diameter is determined by general measurement or computational methods (such as screening method).Extraly, under the second time sintering condition that temperature compared with the first sintering condition for the first metal powder sintered layer segment 2C is lower and the time is shorter, sintering the second metal powder sintered layer segment 3.Therefore, it is possible to make the porosity ratio of the second metal powder sintered layer segment 3 be significantly higher than the porosity ratio of the first metal powder sintered layer segment 2C.
In addition, the first metal powder sintered layer segment 2C accepts two-step sintering technique (first sintering and second time sintering).Therefore, in second time sintering process, the first metal powder sintered layer segment 2C is diffused and is bonded to the second metal powder sintered layer segment 3.Meanwhile, further sintering the first metal powder sintered layer segment 2C and the porosity ratio of the first metal powder sintered layer segment 2C becomes lower.As a result, block more definitely in whole first metal powder sintered layer segment 2C, and efficiently can limit the pressurized gas discharged from the inner circumferential surface 21 of the first metal powder sintered layer segment 2C.Therefore, the pressurized gas of less amount can be realized consuming and there is the pressurized air radial bearing 1C of more high hardness.
In the present embodiment, what be similar to above-mentioned first embodiment is, first and second metal powder sintered layer segment 2C and 3 can be provided with sealing layer (not shown) at two end surface 23 and 33 place, so that prevent pressurized gas from leaking from two end surfaces 23 and 33 of the first and second metal powder sintered layer segment 2C and 3.
The present invention is not limited to above-described embodiment, and can at random be changed within the scope of the invention.Such as, although the external shape of back pad metal 4 is columnar in each embodiment above-mentioned, external shape can be rectangle.In addition, the shape of the bearing surface of each in the first metal powder sintered layer segment 2A-2C is not limited to cylindrical shape.Bearing surface has with the shape (such as rectangular shape) treating to be adapted by the shape of the object supported just enough.
In in the above-described embodiments each, metal sleeve is used as mould, is together formed to make back pad metal 4 and the second metal powder sintered layer segment 3.The present invention is not limited to this.Such as, common tubular moulding mould can be used but not metal sleeve.In this case, the body comprising the layering of the first metal powder sintered layer segment 2C and the second metal powder sintered layer segment 3 was formed before back pad metal 4.After this, diffusion bonding is to each other and the integrated first metal powder sintered layer segment 2A-2C and the second metal powder sintered layer segment 3 are pressed in metal sleeve, to make sleeve as back pad metal 4.
Industrial applicability
The present invention can be applied to pressurized air radial bearing, and described pressurized air radial bearing supports the radial load of the rotating body as object to be supported in a non-contact manner.
List of reference signs
1A, 1B and 1C: pressurized air radial bearing; 2A, 2B and 2C: the first metal powder sintered layer segment; 3: the second metal powder sintered layer segments; 4: back pad metal; 5: green compact; 6: bell metal spherical powder: 7: sleeve; 11: through hole; The inner circumferential surface (bearing surface) of 21: the first metal powder sintered layer segment 2A-2C; The external peripheral surface of 22: the first metal powder sintered layer segment 2A-2C; Two end surfaces of 23: the first metal powder sintered layer segment 2A-2C; The inner circumferential surface of 31: the second metal powder sintered layer segments 3; The external peripheral surface of 32: the second metal powder sintered layer segments 3; And 33: the second two end surfaces of metal powder sintered layer segment 3.
Claims (6)
1. a pressurized air radial bearing, the bearing surface of described pressurized air radial bearing supports the radial load as waiting the rotating body supporting object in a non-contact manner, and described pressurized air radial bearing comprises:
First metal powder sintered layer segment of tubulose, the inner circumferential surface of described first metal powder sintered layer segment is bearing surface; And
Second metal powder sintered layer segment, described second metal powder sintered layer segment is formed on the external peripheral surface of the first metal powder sintered layer segment, and has porosity ratio higher compared with layer segment metal powder sintered with first, wherein:
The first metal powder sintered layer segment is formed by performing first sintering; And
By the first metal powder sintered layer segment is placed as the core in tubular die, and by metallic dust being filled in the gap between core and mould, and subsequently by performing second time sintering, form the second metal powder sintered layer segment.
2. pressurized air radial bearing according to claim 1, wherein:
The almost identical bell metal spherical powder of average particulate diameter is respectively applied for the first metal powder sintered layer segment and the second metal powder sintered layer segment; And
Second metal powder sintered layer segment is sintered under second time sintering condition, and described second time sintering condition comprises temperature lower compared with the first sintering condition for the first metal powder sintered layer segment and shorter time.
3. pressurized air radial bearing according to claim 1, wherein:
Bell metal spherical powder for the first metal powder sintered layer segment has average particulate diameter larger compared with the average particulate diameter of the bell metal spherical powder for the second metal powder sintered layer segment.
4. a pressurized air radial bearing, the bearing surface of described pressurized air radial bearing supports the radial load as waiting the rotating body supporting object in a non-contact manner, and described pressurized air radial bearing comprises:
First metal powder sintered layer segment of tubulose, the inner circumferential surface of described first metal powder sintered layer segment is bearing surface; And
Second metal powder sintered layer segment, described second metal powder sintered layer segment is formed on the external peripheral surface of the first metal powder sintered layer segment, and has porosity ratio higher compared with layer segment metal powder sintered with first, wherein:
By the tubulose green compact of the mixed-powder containing electrolytic copper powder and tin powder are placed as the core in tubular die, and bell metal spherical powder is filled in the gap between core and mould, and perform sintering subsequently, together form the first metal powder sintered layer segment and the second metal powder sintered layer segment.
5. according to pressurized air radial bearing described one of in claim 1-4, wherein:
Pressurized air radial bearing also comprises the back pad metal on the external peripheral surface being formed at the second metal powder sintered layer segment; And
Back pad metal is the metal sleeve being used as mould.
6. according to pressurized air radial bearing described one of in claim 1-4, wherein:
Pressurized air radial bearing also comprises the back pad metal on the external peripheral surface being formed at the second metal powder sintered layer segment;
Mould is shaping die; And
Back pad metal is the metal sleeve that the second metal powder sintered layer segment is pressed into wherein.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-187458 | 2012-08-28 | ||
| JP2012187458A JP5965783B2 (en) | 2012-08-28 | 2012-08-28 | Method for producing hydrostatic gas radial bearing |
| PCT/JP2013/070860 WO2014034368A1 (en) | 2012-08-28 | 2013-08-01 | Aerostatic radial bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104520600A true CN104520600A (en) | 2015-04-15 |
| CN104520600B CN104520600B (en) | 2017-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380041376.0A Expired - Fee Related CN104520600B (en) | 2012-08-28 | 2013-08-01 | Pressurized air journal bearing |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP5965783B2 (en) |
| KR (1) | KR20150051993A (en) |
| CN (1) | CN104520600B (en) |
| TW (1) | TW201408897A (en) |
| WO (1) | WO2014034368A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115057101A (en) * | 2022-06-02 | 2022-09-16 | 深圳市恒歌科技有限公司 | Metal perfume volatilization cover and manufacturing method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI644029B (en) * | 2016-06-30 | 2018-12-11 | 祥瑩有限公司 | Double-layer sliding bearing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1162966A (en) * | 1997-08-28 | 1999-03-05 | Toshiba Mach Co Ltd | Hydrostatic bearing and manufacture thereof |
| CN1493420A (en) * | 2002-08-28 | 2004-05-05 | ͬ�Ϳ�ҵ��ʽ���� | Bearing material for porous fluid pressure-feed air bearing and bearing using the same |
| JP2005221002A (en) * | 2004-02-05 | 2005-08-18 | Nsk Ltd | Forming method for gas throttle layer |
| CN101044332A (en) * | 2004-10-18 | 2007-09-26 | 韩国科学技术研究院 | Air foil bearing having a porous foil |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000009142A (en) * | 1998-06-18 | 2000-01-11 | Asahi Optical Co Ltd | Manufacture of bearing device and bearing device |
| JP2006097797A (en) * | 2004-09-29 | 2006-04-13 | Oiles Ind Co Ltd | Porous static pressure gas bearing and its manufacturing method |
-
2012
- 2012-08-28 JP JP2012187458A patent/JP5965783B2/en active Active
-
2013
- 2013-07-02 TW TW102123629A patent/TW201408897A/en unknown
- 2013-08-01 CN CN201380041376.0A patent/CN104520600B/en not_active Expired - Fee Related
- 2013-08-01 KR KR1020157002771A patent/KR20150051993A/en active Search and Examination
- 2013-08-01 WO PCT/JP2013/070860 patent/WO2014034368A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1162966A (en) * | 1997-08-28 | 1999-03-05 | Toshiba Mach Co Ltd | Hydrostatic bearing and manufacture thereof |
| CN1493420A (en) * | 2002-08-28 | 2004-05-05 | ͬ�Ϳ�ҵ��ʽ���� | Bearing material for porous fluid pressure-feed air bearing and bearing using the same |
| JP2005221002A (en) * | 2004-02-05 | 2005-08-18 | Nsk Ltd | Forming method for gas throttle layer |
| CN101044332A (en) * | 2004-10-18 | 2007-09-26 | 韩国科学技术研究院 | Air foil bearing having a porous foil |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115057101A (en) * | 2022-06-02 | 2022-09-16 | 深圳市恒歌科技有限公司 | Metal perfume volatilization cover and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5965783B2 (en) | 2016-08-10 |
| TW201408897A (en) | 2014-03-01 |
| WO2014034368A1 (en) | 2014-03-06 |
| JP2014043918A (en) | 2014-03-13 |
| CN104520600B (en) | 2017-03-08 |
| KR20150051993A (en) | 2015-05-13 |
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