JP2023047636A - Manufacturing method of static pressure gas journal porous bearing and static pressure gas journal porous bearing - Google Patents

Abstract

To provide a manufacturing method of a static pressure gas journal porous bearing which can fixedly position a porous member relative to a housing member, seal a gap between the housing member and the porous member, and secure a supply amount of a gas to a bearing gap formed between the porous member and a shaft with a simple structure, and to provide the static pressure gas journal porous bearing.SOLUTION: A bearing 100 includes: a cylindrical porous member 110; and a housing member 120 having a cylindrical part 121, into which the porous member 110 is inserted, and supports a radius load of a shaft S with a gas jetted from the porous member 110. A manufacturing method of the bearing 100 includes: a press-fitting step where a front end 113 of the porous member 110 is press-fitted into a front end insertion portion 121A of the cylindrical part 121; and a sealing step where a rear end insertion portion 121C of the cylindrical part 121, in which a rear end 114 of the porous member 110 is loosely fitted, is plastically deformed to form a protruding area 121C1 and deform the rear end 114 of the porous member 110.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a hydrostatic gas journal porous bearing that supports the side surface of an object to be supported in a non-contact state, and the hydrostatic gas journal porous bearing.

A hydrodynamic bearing is known that includes a porous member facing the support object and a housing member that holds the porous member in order to support the support object on its surface.
As a method of manufacturing such a hydrodynamic bearing, a bearing metal (porous member) made of a porous sintered alloy permeated with lubricating oil is press-fitted into a hole provided in a housing (housing member), and both ends of the housing are press-fitted. is known to be crimped toward the bearing metal to lock the bearing metal (see Patent Document 1, for example).

Microfilm of Japanese Utility Model Application No. 47-132519 (Japanese Utility Model Publication No. 53-22667) (particularly, FIGS. 2 and 3)

In the manufacturing method of the hydrodynamic bearing described above, the bearing metal is positioned and fixed with respect to the housing, and the space between the bearing metal and the housing is sealed. As a result, the fine holes for impregnating the lubricating oil on the outer peripheral side of the bearing metal are crushed over the entire length in the longitudinal direction.
That is, although the above-described method of manufacturing a hydrodynamic bearing can be applied to a hydrodynamic journal bearing in which the outer peripheral surface of a shaft (supported object) is surface-supported by lubricating oil impregnated in a bearing metal, it cannot be supplied from an external compressed gas source. To manufacture a hydrostatic gas journal porous bearing that takes in the compressed gas from the outer peripheral surface of the porous member and ejects the compressed gas from the inner peripheral surface of the porous member to support the side surface of the support object in a non-contact state Not applicable, positioning and fixing of the porous member to the housing member, sealing between the housing member and the porous member, and the amount of gas supply to the bearing gap formed between the porous member and the shaft. It has been difficult to manufacture a hydrostatic gas journal porous bearing that satisfies all requirements.

SUMMARY OF THE INVENTION Accordingly, the present invention is to solve the problems of the prior art as described above. Static pressure gas journal porous bearing manufacturing method and static pressure gas journal that satisfies both the sealing of the bearing and the securing of gas supply to the bearing gap formed between the porous member and the shaft with a simple structure Another object is to provide a porous bearing.

The invention according to claim 1 comprises: a cylindrical porous member for ejecting gas that has flowed in from the outer peripheral surface from the inner peripheral surface; and a housing member having a cylindrical portion with a flow path, wherein a load in the radial direction of a shaft to be supported is supported by gas ejected from the porous member. a press-fitting step of press-fitting the front end portion of the porous member into the front end insertion portion of the tubular portion; and a sealing step of deforming the rear end portion of the porous member by the projecting region.

According to a second aspect of the invention, in addition to the configuration of the method for manufacturing a hydrostatic gas journal porous bearing according to the first aspect, the pressure-insertion gas journal porous bearing is loosely fitted to the rear end insertion portion of the cylindrical portion in the press-fitting step. By connecting the rear end side outer peripheral surface and the rear end surface of the porous member with an inclined surface, the above-described problems can be further solved.

The invention according to claim 3 is, in addition to the configuration of the method for manufacturing a hydrostatic gas journal porous bearing according to claim 1 or claim 2, wherein the rear end surface of the housing member is the rear end surface of the porous member. The sealing step is performed by pressing against the rear end surface of the housing member a crimping die that has a projection that is harder than the housing member and plastically deforms the housing member. , which further solves the problems described above.

The invention according to claim 4 is characterized by a cylindrical porous member for ejecting gas that has flowed in from the outer peripheral surface from the inner peripheral surface, and a gas that supplies the gas from the outside to the porous member while inserting the porous member. a static pressure gas journal porous bearing comprising a housing member having a cylindrical portion forming a flow path, and supporting a load in a radial direction of a shaft to be supported by gas ejected from the porous member, The cylindrical portion of the housing member includes a front end insertion portion that is in pressure contact with the front end portion of the porous member, a rear end insertion portion that loosely fits the rear end portion of the porous member, the front end insertion portion, and the rear end. an intermediate insertion portion formed between the housing member and the insertion portion and having the gas flow path; and a protruding region protruding from the rear end insertion portion of the housing member toward the porous member The above-mentioned problem is solved by abutting on the rear end of the .

The invention according to claim 5 further solves the above-described problems by integrally forming the housing member in addition to the configuration of the hydrostatic gas journal porous bearing described in claim 4. be.

The invention according to claim 6, in addition to the configuration of the hydrostatic gas journal porous bearing described in claim 4 or 5, is characterized in that the projecting region of the housing member is located rearward of the rear end surface of the porous member. , which further solves the above-mentioned problems.

The static pressure gas journal porous bearing of the present invention can support the load in the radial direction of the shaft to be supported by the gas ejected from the porous member, and can exhibit the following effects specific to the present invention. can.

According to the method for manufacturing a hydrostatic gas journal porous bearing of the first aspect of the invention, the press-fitting step of press-fitting the front end portion of the porous member into the front end insertion portion of the cylindrical portion is provided. However, since the front end portion is in pressure contact with the front end insertion portion of the housing member, the porous member can be positioned and fixed to the housing member with a simple structure.
In addition, a press-fitting step of press-fitting the front end portion of the porous member into the front end insertion portion of the cylindrical portion, and plastically deforming the rear end insertion portion of the cylindrical portion into which the rear end portion of the porous member is loosely fitted to form the projecting region. and a sealing step of deforming the rear end of the porous member by means of the protruding region, so that the opening around the outer peripheral surface of the front end of the porous member is formed by pressure contact with the front end insertion portion of the housing member. A clogging layer is formed, and the rear end portion of the porous member is deformed by the protruding region protruding from the rear end insertion portion of the housing member toward the porous member, clogging the periphery of the outer peripheral surface of the rear end portion of the porous member. Since the layer is formed, not only is it possible to seal between the housing member and the porous member, but also the permeability of the ventilation layer other than the front end and the rear end of the porous member is higher than that of the clogging layer. Since it is higher than the ratio, it is possible to ensure the amount of gas supplied to the bearing clearance formed between the porous member and the shaft.
Therefore, positioning and fixing of the porous member with respect to the housing member, sealing between the housing member and the porous member, and ensuring the supply of gas to the bearing clearance formed between the porous member and the shaft. can be satisfied with a simple structure.

According to the method for manufacturing a static pressure gas journal porous bearing according to the second aspect of the invention, in addition to the effects of the method for manufacturing a static pressure gas journal porous bearing according to the first aspect of the invention, the tubular shape is formed in the press-fitting step. By connecting the rear end side outer peripheral surface and the rear end surface of the porous member loosely fitted to the rear end insertion portion of the part by the inclined surface, the rear end portion of the porous member is deformed in the sealing process. Since the crushing margin near the rear end side outer peripheral surface of the porous member is reduced when the porous member is pressed, the rear end side inner peripheral surface of the porous member is less likely to protrude toward the central shaft side, and the hydrostatic gas journal porous bearing and the shaft not only can the bearing clearance between the Since the rear end portion of the member is in contact with the housing member and is less likely to be scraped off, dust from shavings from the porous member is less likely to enter between the porous member and the housing member, and the porous member and the housing member are reliably separated. The gap can be sealed, and deformation of the inner diameter side of the housing member due to shavings can be suppressed.

According to the method for manufacturing a static pressure gas journal porous bearing of the invention according to claim 3, in addition to the effects of the method for manufacturing a static pressure gas journal porous bearing according to the invention according to claim 1 or 2, the housing The rear end surface of the member is positioned rearwardly of the rear end surface of the porous member, and the sealing step includes forming a crimping die that plastically deforms the housing member with a projection that is harder than the housing member. When the caulking die is pressed against the housing member, it becomes difficult for the caulking die to come into contact with the porous member. Damage to the porous member due to contact with the mold can be prevented.

According to the hydrostatic gas journal porous bearing of the invention according to claim 4, the cylindrical portion of the housing member has a front end insertion portion that is in pressure contact with the front end portion of the porous member and a rear end insertion portion that loosely fits the porous member. Since the porous member is in pressure contact with the front end insertion portion of the housing member at the front end portion, the porous member can be positioned and fixed to the housing member with a simple structure.
In addition, the cylindrical portion of the housing member has a rear end insertion portion into which the porous member is loosely fitted, and the protruding region that protrudes from the rear end insertion portion of the housing member toward the porous member extends behind the porous member. By abutting on the end side, a clogging layer is formed around the outer peripheral surface of the front end portion of the porous member due to pressure contact with the front end insertion portion of the housing member, and the clogging layer is formed from the rear end insertion portion of the housing member to the porous member. Since the rear end of the porous member is deformed by the protruding region that protrudes toward the porous member and a clogging layer is formed around the outer peripheral surface of the rear end of the porous member, sealing between the housing member and the porous member is prevented. In addition, since the air permeability of the air-permeable layer other than the front end and rear end of the porous member is higher than that of the clogging layer, the air permeability formed between the porous member and the shaft is increased. The amount of gas supplied to the bearing clearance can be secured.
Therefore, positioning and fixing of the porous member with respect to the housing member, sealing between the housing member and the porous member, and ensuring the supply of gas to the bearing clearance formed between the porous member and the shaft. can be satisfied with a simple structure.

According to the static pressure gas journal porous bearing of the invention according to claim 5, in addition to the effects of the static pressure gas journal porous bearing of the invention according to claim 4, the housing member is integrally formed. Since the structure of the housing member is simpler than when the housing member is divided and formed, the structure of the hydrostatic gas journal porous bearing becomes simpler, and gas leakage points are minimized. can be done.

According to the static pressure gas journal porous bearing of the invention according to claim 6, in addition to the effects of the static pressure gas journal porous bearing of the invention according to claim 4 or 5, the protruding region of the housing member is Positioning behind the rear end surface of the porous member allows the protruding region of the housing member to hold the rear end surface of the porous member from the rear, making it more difficult for the porous member to slip out of the housing member. .

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the bearing which is 1st Example of this invention. II-II sectional view of FIG. III enlarged view of FIG. FIG. 2 is a cross-sectional view of the housing member shown in FIG. 1; FIG. 2 is a view showing how the bearing shown in FIG. 1 is used; FIG. 4 is a view for explaining a press-fitting step in the method of manufacturing the bearing according to the first embodiment of the present invention; VIB enlarged view of FIG. 6A. FIG. 4 is a diagram for explaining a sealing step in the method of manufacturing the bearing according to the first embodiment of the present invention; FIG. 4 is a diagram for explaining a sealing step in the method of manufacturing the bearing according to the first embodiment of the present invention; The perspective view of the bearing which is 2nd Example of this invention. The bottom view of the bearing which is 2nd Example of this invention. Sectional drawing of the bearing which is a 1st modification of this invention. Sectional drawing of the bearing which is a 2nd modification of this invention.

In the present invention, a cylindrical porous member for ejecting gas that has flowed in from the outer peripheral surface from the inner peripheral surface, and a gas flow path that inserts the porous member and supplies gas from the outside to the porous member are formed. and a housing member having a cylindrical portion, wherein a load in the radial direction of a shaft to be supported is supported by gas ejected from the porous member, the method comprising: a cylindrical portion; a press-fitting step of press-fitting the front end portion of the porous member into the front end insertion portion of the porous member; a sealing step of deforming the rear end portion of the porous member by a region, positioning and fixing the porous member to the housing member; sealing between the housing member and the porous member; Any specific embodiment may be used as long as it satisfies all of the requirements of ensuring the amount of gas supplied to the bearing gap formed between the bearings with a simple structure.
In addition, the present invention includes a cylindrical porous member for ejecting from the inner peripheral surface the gas that has flowed in from the outer peripheral surface, and a gas flow path in which the porous member is inserted and the gas is supplied to the porous member from the outside. a hydrostatic gas journal porous bearing for supporting a load in the radial direction of a shaft to be supported by gas ejected from the porous member, the housing member comprising a housing member having a tubular portion formed therein; A shaped portion is formed between a front end insertion portion that presses against the front end portion of the porous member, a rear end insertion portion that loosely fits the rear end portion of the porous member, and between the front end insertion portion and the rear end insertion portion. and an intermediate insertion portion having a gas flow path, and a protruding region protruding from the rear end insertion portion of the housing member toward the porous member abuts the rear end portion of the porous member and forms a porous body with respect to the housing member. Positioning and fixing of members, sealing between the housing member and the porous member, and securing of gas supply to the bearing clearance formed between the porous member and the shaft are all achieved with a simple structure. Any specific embodiment may be used as long as it is one.

For example, the cross-sectional shape of the shaft to be supported by the hydrostatic gas journal porous bearing may be circular, may be D-shaped in order to suppress rotation of the shaft, or may be two It may also be I-shaped, formed from a straight portion and two curvilinear portions connecting it.
When the cross-sectional shape of the shaft is D-shaped or I-shaped, the cross-sectional shape of the through-hole extending in the axial direction of the porous member is also D-shaped or I-shaped, and the cross-sectional shape of the through hole is also D-shaped or I-shaped. Since the thickness of the porous member is greater than the thickness of the porous member at the position facing the curved surface of the shaft, in order to increase the amount of gas ejected from the position facing the flat surface of the shaft, the gas flow path must be widened. It is preferable to provide it at a position facing the flat surface of the shaft.

For example, the gas used in the hydrostatic gas journal porous bearing of the present invention is preferably air, but other gases are possible.

For example, the housing member in the hydrostatic gas journal porous bearing of the present invention is preferably integral, but may be split.

A bearing 100, which is a static pressure gas journal porous bearing according to a first embodiment of the present invention, will now be described with reference to FIGS. 1 to 6B.

<1. Structure of Bearing 100 of First Embodiment of the Present Invention>
First, the structure of a bearing 100, which is a first embodiment of the present invention, will be described with reference to FIGS. 1 to 4. FIG.
1 is a perspective view of a bearing according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, FIG. 3 is an enlarged view of line III of FIG. 2, and FIG. 2 is a cross-sectional view of the housing member shown in FIG.

A bearing 100, which is a first embodiment of the present invention, is a hydrostatic gas journal porous bearing that supports the radial load of a shaft to be supported by externally supplied air.
As shown in FIGS. 1 and 2, the bearing 100 includes a cylindrical porous member 110 for ejecting gas from an outer peripheral surface 111 from an inner peripheral surface 112, and a housing surrounding the porous member 110. A member 120 is provided.

<1.1. Porous member>
Innumerable micropores are formed in the porous member 110, and the outer peripheral surface 111 and the inner peripheral surface 112 are in communication.
Therefore, the compressed air that has flowed in from the outer peripheral surface 111 is ejected from the inner peripheral surface 112 .

As shown in FIGS. 2 and 3, the porous member 110 includes a ventilation layer 110A in which a myriad of pores are formed and a mesh having a lower permeability than the ventilation layer 110A due to crushed pores. A clogged layer 110B is formed.
The clogging layer 110B is formed around a portion where the porous member 110 and the housing member 120 are in contact with each other.
Specifically, as shown in FIGS. 2 and 3, the clogging layer 110B is formed around the outer peripheral surface 111 of the front end portion 113 of the porous member 110 and around the outer peripheral surface 111 of the rear end portion 114 of the porous member 110. and is formed.

<1.2. Housing member>
As shown in FIGS. 1 to 4, the housing member 120 is integrally formed with a cylindrical tubular portion 121 into which the porous member 110 is inserted and an annular flange portion 122 protruding from the tubular portion 121. The porous member 110 is harder than the porous member 110 .

<1.2.1. Cylindrical part>
As shown in FIG. 2, the cylindrical portion 121 has a front end surface 121a flush with the front end surface 113a of the porous member 110, and a rear end surface 121b located behind the rear end surface 114a of the porous member 110. are doing.
4, the front end surface 121a and the inner wall surface 121d are connected by an inclined surface 121e.
Further, as shown in FIG. 2 and the like, the outer wall surface 121c is formed with concave grooves 121c1 for inserting O-rings above and below a gas flow path 121B1, which will be described later.

4, the cylindrical portion 121 has a front end insertion portion 121A that presses against the front end portion 113 of the porous member 110, an intermediate insertion portion 121B, and a rear end portion 114 of the porous member 110. and a rear end insertion portion 121C to be fitted.

The inner diameter φA of the front end insertion portion 121A is smaller than the inner diameter φB of the intermediate insertion portion 121B and the inner diameter φC of the rear end insertion portion 121C.
Furthermore, the inner diameter φA of the front end insertion portion 121A is slightly smaller than the outer diameter φ of the porous member 110 .

The intermediate insertion portion 121B is formed between the front end insertion portion 121A and the rear end insertion portion 121C.
The inner diameter φB of the intermediate insertion portion 121B is larger than the inner diameter φA of the front end insertion portion 121A and the inner diameter φC of the rear end insertion portion 121C.
As a result, the gap G between the intermediate insertion portion 121B and the porous member 110 is larger than the gaps between the front end insertion portion 121A and the rear end insertion portion 121C and the porous member 110, as shown in FIG. Therefore, a sufficient amount of air to be supplied to the porous member 110 can be ensured.

A gas passage 121B1 is formed through the intermediate insertion portion 121B in the radial direction to supply gas to the porous member 110 from the outside.
This gas flow path 121B1 is a female screw hole for screwing a joint.
Further, the outer wall surface 121c around the inlet of the gas flow path 121B1 is flat as shown in FIG.

The inner diameter φC of the rear end insertion portion 121C is slightly larger than the outer diameter φ of the porous member 110 .
Further, a protruding region 121C1 protruding toward the porous member 110 is formed in the rear end insertion portion 121C, and the protruding region 121C1 covers the rear end portion 114 of the porous member 110 as shown in FIG. They are in contact so as to cover each other.
That is, the protruding region 121C1 is located behind the rear end surface 114a of the porous member 110. As shown in FIG.

<1.2.2. Flange>
The front end surface 122a of the flange portion 122 is flush with the front end surface 121a of the cylindrical portion 121 and also flush with the front end surface 113a of the porous member 110, as shown in FIG.
Four stepped bolt insertion holes 122b extending in the thickness direction (vertical direction) are formed in the flange portion 122 at regular intervals in the circumferential direction.

<2. Assembly of the bearing 100 according to the first embodiment of the present invention and gas flow>
Next, the assembly of the bearing 100 of the first embodiment of the present invention and the support of the shaft will be described with reference to FIG. 5, which is a usage diagram of the bearing shown in FIG.

<2.1. Main structure of device in which bearing 100 is incorporated>
First, based on FIG. 5, the main part of the device in which the bearing 100 is assembled will be described.

A flow channel C is formed in a device-side mounting portion M of a device in which the bearing 100 is incorporated, and a joint J is attached to one end of the flow channel C. As shown in FIG.
A tube T extending from a compressed air source (not shown) is connected to the joint J.
Therefore, the compressed air A flows into the flow path C through the tube T and the joint J. As shown in FIG.

The device-side mounting portion M is formed with a bearing mounting hole MH into which the bearing 100 is inserted.
The diameter of this bearing mounting hole MH is slightly larger than the outer diameter of the tubular portion 121 of the bearing 100 .

Further, the device-side mounting portion M is formed with a female threaded hole HS for screwing with the mounting bolt B. As shown in FIG.

<2.2. Incorporation of Bearing into Device>
Next, the assembly of the bearing 100 into the device-side mounting portion M described above will be described with reference to FIG. 5 .

When assembling the bearing 100 into the device-side mounting portion M, first, the O-ring R is attached to the concave groove 121c1 of the bearing 100. As shown in FIG.
Next, the bearing 100 is inserted into the bearing mounting hole MH of the device-side mounting portion M so that the gas flow path 121B1 of the bearing 100 faces the flow path C of the device-side mounting portion M. As shown in FIG.
Next, the bearing 100 is incorporated into the device-side mounting portion M by inserting the mounting bolt B through the bolt insertion hole 122b of the bearing 100 and screwing the mounting bolt B into the female screw hole HS.
When the bearing 100 is incorporated in the device-side mounting portion M, the O-ring R is crushed by contact with the device-side mounting portion M, and the compressed air A does not leak from the gap between the bearing 100 and the device-side mounting portion M. It's like

<2.3. Shaft Support by Bearing>
Next, with reference to FIG. 5, the support of the shaft by the bearing 100 incorporated in the device-side mounting portion M will be described.

The shaft S is inserted through the bearing 100 in a state in which the bearing 100 is assembled in the device-side mounting portion M. As shown in FIG.
When the compressed air A is supplied to the apparatus in this state, the compressed air A is supplied to the gap G between the porous member 110 and the housing member 120 through the flow path C and the gas flow path 121B1 of the bearing 100. be.
At this time, since the clogging layer 110B is formed on the front end portion 113 of the porous member 110, the space between the front end portion 113 of the porous member 110 and the housing member 120 is sealed, and the front end portion of the porous member 110 is sealed. Compressed air A is less likely to leak from between 113 and housing member 120 .
Similarly, since the clogging layer 110B is also formed between the rear end portion 114 of the porous member 110 and the projecting region 121C1 of the housing member 120, the rear end portion 114 of the porous member 110 and the housing member 120 are separated from each other. The space between is sealed, and the compressed air A is less likely to leak from between the rear end portion 114 of the porous member 110 and the housing member 120 .
Therefore, the compressed air A supplied from the flow path C of the device-side attachment portion M fills the ventilation layer 110A of the porous member 110 .

The compressed air A filled in the ventilation layer 110A of the porous member 110 is jetted from the inner peripheral surface 112, the front end surface 113a, and the rear end surface 114a.
By filling the bearing clearance H between the bearing 100 and the shaft S with the compressed air A overflowing from the inner peripheral surface 112, the outer peripheral surface of the shaft S is supported by the compressed air A in a non-contact state.
It should be noted that the compressed air A filling the ventilation layer 110A of the porous member 110 is also ejected from the front end surface 113a and the rear end surface 114a, resulting in the compressibility of the compressed air A filling the bearing clearance H. Self-excited vibration (pneumatic hammer) peculiar to gas bearings is less likely to occur.

<3. Manufacturing Method of Bearing 100>
Next, a method for manufacturing the bearing 100 will be described with reference to FIGS. 6A to 6D.
6A is a view for explaining the press-fitting step in the method of manufacturing the bearing according to the first embodiment of the present invention, FIG. 6B is an enlarged view of VIB of FIG. 6A, and FIG. 6C is the first embodiment of the present invention. FIG. 6D is a diagram for explaining a sealing step in the bearing manufacturing method, and FIG. 6D is a diagram for explaining the sealing step in the bearing manufacturing method according to the first embodiment of the present invention;

First, as shown in FIG. 6A, the housing member 120 is placed on the flat assembly surface F so that the flange portion 122 contacts the flat assembly surface F. As shown in FIG.
Here, as shown in FIG. 6B, the rear end side outer peripheral surface 111a of the porous member 110 is chamfered.
That is, the rear end side outer peripheral surface 111 a and the rear end surface 114 a of the porous member 110 are connected by the inclined surface 115 .
A front end surface 121a and an inner wall surface 121d of the housing member 120 are connected by an inclined surface 121e, and a rear end surface 121b and an inner wall surface 121d are directly connected and substantially perpendicular to each other.

(Press fitting process)
From this state, the porous member 110 is inserted into the housing member 120 from the rear end insertion portion 121C.
Since the inner diameter φC of the rear end insertion portion 121C of the housing member 120 and the inner diameter φB of the intermediate insertion portion 121B are both larger than the outer diameter φ of the porous member 110, the porous member 110 is arranged in the rear end insertion portion 121C of the housing member 120, It is loosely fitted to the intermediate insertion portion 121B.
However, since the inner diameter φA of the front end insertion portion 121A of the housing member 120 is slightly smaller than the outer diameter φ of the porous member 110, the front end portion 113 of the porous member 110 is press-fitted into the front end insertion portion 121A of the housing member 120. By doing so, the porous member 110 is inserted into the front end insertion portion 121A of the housing member 120 .
By this press-fitting, a clogging layer 110B is formed around the outer peripheral surface 111 of the front end portion 113 of the porous member 110, and the porous member 110 is positioned and fixed with respect to the housing member 120 as shown in FIG. 6C. be.

(sealing process)
From this state, as shown in FIG. 6C, a crimping die CT having downwardly protruding projections CT1 is pushed into the bearing 100 from the rear end side thereof.
The protrusion CT1 is annular, and has a cross-sectional shape of a right triangle formed by an outer peripheral vertical side CT1a and an inner peripheral inclined side CT1b, as shown in FIG. 6C.
The distance between the tip of the protrusion CT1 and the base surface facing the bearing 100 is different between the outer side and the inner side of the protrusion CT1, and the height of the protrusion CT1 on the outer side of the protrusion CT1 (the tip of the protrusion CT1 and the distance between the outer base surface CT2 facing the bearing 100) Ho is the height of the projection CT1 inside the projection CT1 (the distance between the tip of the projection CT1 and the inner base surface CT3 facing the bearing 100) Hi is larger than
Furthermore, the height Hi of the protrusion CT1 inside the protrusion CT1 is smaller than the distance h from the rear end surface 121b of the housing member 120 to the rear end surface 114a of the porous member, as shown in FIG. 6D. .
Further, the protrusion CT1 and the inner base surface CT3 are connected by a curved surface CT4 as shown in FIG. 6C.

Since the caulking die CT is made of a material harder than the housing member 120, the caulking die CT is pushed into the housing member 120 and pressed against the rear end surface 121b of the housing member 120, as shown in FIG. 6D. , the rear end insertion portion 121C of the housing member 120 is plastically deformed in accordance with the shape of the protrusion CT1 of the crimping mold CT, and a protrusion region 121C1 is formed along the inner peripheral inclined side CT1b of the protrusion CT1. .
Since the housing member 120 is harder than the porous member 110, the rear end portion 114 of the porous member 110 is pressed by the formation of the projecting region 121C1, and the porous member 110 contacts the projecting region 121C1 of the housing member 120. The contacting portion is crushed and deformed to form the clogging layer 110B.
Note that, as shown in FIG. 6B, the rear end side outer peripheral surface 111a and the rear end surface 114a of the porous member 110 are connected by an inclined surface 115, so that the rear end portion of the porous member 110 is not flattened in the sealing step. 114 is deformed, the collapse margin near the rear end side outer peripheral surface 111a of the porous member 110 is reduced, so the rear end side inner peripheral surface 112a (see FIG. 6D) of the porous member 110 is aligned with the central axis Ax (see FIG. 6D). 6C) side is difficult to overhang.
Further, as shown in FIG. 6B, the rear end side outer peripheral surface 111a and the rear end surface 114a of the porous member 110 are connected by the inclined surface 115, so that the rear end side outer peripheral surface and the rear end surface of the porous member 110 are connected to each other. In the press-fitting process, the rear end portion 114 of the porous member 110 is less likely to come into contact with the housing member 120 and be scraped off compared to the case where the two are directly connected. Shaving dust from the porous member 110 is less likely to be mixed into the housing member 110, and deformation of the inner diameter side of the housing member 120 due to the shaving dust is less likely to occur.

<1.5. Effects of this embodiment>
According to the method of manufacturing the bearing 100 of the present embodiment described above, the press-fitting step of press-fitting the front end portion 113 of the porous member 110 into the front end insertion portion 121A of the cylindrical portion 121 is provided. However, since the front end portion 113 is in pressure contact with the front end insertion portion 121A of the housing member 120, not only can the porous member 110 be positioned and fixed to the housing member 120 with a simple structure, but the positioning accuracy is higher than that by adhesion. can be fixed in position.
In addition, a press-fitting step of press-fitting the front end portion 113 of the porous member 110 into the front end insertion portion 121A of the tubular portion 121, and a rear end insertion portion 121C of the tubular portion 121 in which the rear end portion 114 of the porous member 110 is loosely fitted. is plastically deformed to form a projecting region 121C1, and the rear end portion 114 of the porous member 110 is deformed by the projecting region 121C1. A clogging layer 110B is formed around the outer peripheral surface 111 of the front end portion 113 of the porous member 110 by pressure contact, and the porous member is blocked by the protruding region 121C1 protruding from the rear end insertion portion 121C of the housing member 120 toward the porous member 110. Since the rear end portion 114 of the porous member 110 is deformed to form a clogging layer 110B around the outer peripheral surface 111 of the rear end portion 114 of the porous member 110, sealing between the housing member 120 and the porous member 110 is achieved. In addition, since the air permeability of the air-permeable layer 110A other than the front end portion 113 and the rear end portion 114 of the porous member 110 is higher than the air permeability of the clogging layer 110B, the porous member 110 and the shaft S The amount of gas supplied to the bearing clearance H formed between can be ensured.
Accordingly, positioning and fixing of the porous member 110 to the housing member 120, sealing between the housing member 120 and the porous member 110, and bearing clearance H formed between the porous member 110 and the shaft S are controlled. It is possible to satisfy all requirements with a simple structure.
Furthermore, by sealing the rear end portion 114 of the porous member 110 by the sealing process described above, there is no need to consider the coefficient of thermal expansion of the housing member 120 and the porous member 110, so shrink fitting or cooling fitting is not necessary. It is possible to create a small hydrostatic gas journal porous bearing that cannot be realized with

According to the bearing 100 of the present embodiment described above, the cylindrical portion 121 of the housing member 120 has a front end insertion portion 121A that press-contacts the front end portion 113 of the porous member 110, and a rear end portion that loosely fits the porous member 110. Since the front end portion 113 of the porous member 110 is pressed against the front end insertion portion 121A of the housing member 120 by having the insertion portion 121C, the porous member 110 is positioned and fixed to the housing member 120 with a simple structure. be able to.
Further, the cylindrical portion 121 of the housing member 120 has a rear end insertion portion 121C into which the porous member 110 is loosely fitted, and a protruding region that protrudes from the rear end insertion portion 121C of the housing member 120 toward the porous member 110. 121C1 is in contact with the rear end side of the porous member 110, the clogging layer 110B is formed around the outer peripheral surface 111 of the front end portion 113 of the porous member 110 due to pressure contact with the front end insertion portion 121A of the housing member 120. The rear end portion 114 of the porous member 110 is deformed by the protruding region 121C1 that is formed and protrudes from the rear end insertion portion 121C of the housing member 120 toward the porous member 110, and the outer periphery of the rear end portion 114 of the porous member 110 is deformed. Since the clogging layer 110B is formed around the surface 111, not only is it possible to seal between the housing member 120 and the porous member 110, Since the gas permeability of the gas permeable layer 110A is higher than that of the clogging layer 110B, the amount of gas supplied to the bearing gap H formed between the porous member 110 and the shaft S can be ensured. .
Accordingly, positioning and fixing of the porous member 110 to the housing member 120, sealing between the housing member 120 and the porous member 110, and bearing clearance H formed between the porous member 110 and the shaft S are controlled. It is possible to satisfy all requirements with a simple structure.

In addition, since the housing member 120 is integrally formed, the structure of the housing member 120 is simpler than when the housing member 120 is divided and formed, so the structure of the bearing 100 is simpler. , gas leakage points can be minimized.

In addition, since projecting region 121C1 of housing member 120 is located behind rear end surface 114a of porous member 110, projecting region 121C1 of housing member 120 projects rear end surface 114a of porous member 110 from the rear. As a result, the porous member 110 can be made more difficult to slip out of the housing member 120 .

Further, as shown in FIG. 6A, the rear end surface 121b and the outer wall surface 121c of the housing member 120 are connected by an inclined surface 121f.
As a result, the outer diameter of the rear end of the tubular portion 121 becomes smaller than that of the front end. The diameter can be reduced.

Next, a bearing 200, which is a second embodiment of the hydrostatic gas journal porous bearing of the present invention, will be described with reference to FIGS. 7 and 8. FIG.
FIG. 7 is a perspective view of the bearing according to the second embodiment of the invention, and FIG. 8 is a bottom view of the bearing according to the second embodiment of the invention.
The bearing 200 of the second embodiment is obtained by changing the shape of the housing member 120 of the bearing 100 of the first embodiment, and has many elements in common with the bearing 100 of the first embodiment. will be omitted from detailed description, and only the 200-series codes having the same last two digits will be assigned.

As shown in FIG. 7, the housing member 220 is cylindrical and does not have a flange portion unlike the first embodiment.
As shown in FIG. 8, a front end face 221a of the housing member 220 has a plurality of (four in this embodiment) screw holes 221a1 in which screws for fixing the bearing 200 to the device are screwed in the circumferential direction. They are formed at regular intervals.

<Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above.

For example, in the above-described embodiment, compressed air is supplied to the bearing from the flow path C of the device-side mounting portion M. A tube T extending from a compressed air source (not shown) may be connected to the joint.

For example, in the above-described first embodiment, four stepped bolt insertion holes 122b extending in the thickness direction were formed in the flange portion 122 at equal intervals in the circumferential direction. The number of bolt insertion holes 122b is not limited to four.

For example, in the above-described second embodiment, the bearing 200 is assembled into the device-side mounting portion M by inserting a screw from the device-side mounting portion M into the bearing 200 and screwing the screw into the screw hole 221a1. However, the bearing 200 may be directly press-fitted into the device-side mounting portion M.
When the bearing 200 is press-fitted and fixed, the bearing 200 does not need to be provided with a screw hole and an O-ring is not required.

For example, the porous member in the above-described embodiments may have any material and porosity as long as it can eject gas from its surface.
In addition, in the above-described embodiment, the front end surface and the rear end surface of the porous member were not subjected to the sealing treatment, but the front end surface and the rear end surface of the porous member may be subjected to the sealing treatment.

For example, the shape of the projecting region 121C1 in the above-described embodiment is merely an example, and may vary depending on the shape of the crimping mold CT. The projecting region 121C1 may have any shape as long as the clogged layer 110B can be formed.

Specifically, as shown in FIG. 9A, which is a cross-sectional view of a bearing that is a first modified example of the present invention, while the cross-sectional shape of the annular projection CT1 is a right-angled triangular shape as in the first embodiment, The inner peripheral inclined side CT1b of the protrusion CT1 and the inner base surface CT3 are not connected by a curved surface but are directly connected.
The height Ho of the protrusion CT1 outside the protrusion CT1 and the height Hi of the protrusion CT1 inside the protrusion CT1 are substantially equal.
Furthermore, also in the first modification, the height Hi of the protrusion CT1 inside the protrusion CT1 is smaller than the distance h from the rear end surface 121b of the housing member 120 to the rear end surface 114a of the porous member.
As a result, the contact area of the protrusion CT1 of the crimping type CT with the housing member 120 is reduced, and the crimping type CT is less likely to be damaged.

Furthermore, as shown in FIG. 9B, which is a cross-sectional view of a bearing according to a second modification of the present invention, while the cross-sectional shape of the annular projection CT1 is triangular, the inner peripheral side inclined side CT1b of the projection CT1 and the It is directly connected to the inner base surface CT3 instead of being connected by a curved surface.
The height Ho of the protrusion CT1 outside the protrusion CT1 and the height Hi of the protrusion CT1 inside the protrusion CT1 are substantially equal.
In addition, the inclination of the inner peripheral side inclined side CT1b with respect to the inner base surface CT3 is larger than the inclination of the outer peripheral side inclined side CT1c with respect to the outer base surface CT2.
That is, since the inclination of the outer peripheral side inclined side CT1c with respect to the outer base surface CT2 is smaller than the inclination of the inner peripheral side inclined side CT1b with respect to the inner base surface CT3, the outer peripheral wall 121c on the rear end side of the housing member 120 is less likely to swell. .
Further, the height Hi of the protrusion CT1 inside the protrusion CT1 is larger than the distance h from the rear end surface 121b of the housing member 120 to the rear end surface 114a of the porous member.

100, 200 ... Bearing (hydrostatic gas journal porous bearing)
110, 210... Porous member 110A... Vent layer 110B... Clogging layer 111... Outer peripheral surface 111a... Rear end side outer peripheral surface 112... Inner peripheral surface 112a... Rear end Side inner peripheral surface 113 Front end portion 113a Front end surface 114 Rear end portion 114a Rear end surfaces 120, 220 Housing member 121 Cylindrical portion 121A Front end insertion Part 121B... Intermediate insertion part 121B1... Gas channel 121C... Rear end insertion part 121C1... Protruding regions 121a, 221a... Front end face
221a1... Screw hole 121b... Rear end face (rear end face of housing member)
121c... Outer wall surface 121c1... Groove 121d... Inner wall surface 121e... Inclined surface 121f... Inclined surface 122... Flange portion 122a... Front end surface 122b... Bolt insertion hole

φ … Outer diameter of porous member φA … Inner diameter of front end insertion φB … Inner diameter of intermediate insertion φC … Inner diameter of rear end insertion M … Device side mounting portion C … Flow path MH ... Bearing mounting hole J ... Joint T ... Tube B ... Mounting bolt HS ... Female screw hole A ... Compressed air (gas)
R...O-ring S...Axis G...Gap H...Bearing clearance h...Distance from the rear end surface of the housing member to the rear end surface of the porous member Ax...Center axis F...・Assembly surface CT: crimping type CT1: protrusion CT1a: outer peripheral vertical side CT1b: inner peripheral inclined side CT2: outer base surface CT3: inner base surface CT4:・Curved surface Ho: height of protrusion on outside of protrusion Hi: height of protrusion on inside of protrusion

Claims (6)

Cylindrical porous member for ejecting from the inner peripheral surface the gas that has flowed in from the outer peripheral surface, and a cylindrical portion in which the porous member is inserted and a gas flow path for supplying the gas from the outside to the porous member is formed. and a housing member having:
a press-fitting step of press-fitting the front end portion of the porous member into the front end insertion portion of the cylindrical portion;
A sealing step of plastically deforming a rear end insertion portion of the tubular portion into which the rear end portion of the porous member is loosely fitted to form a projecting region, and deforming the rear end portion of the porous member by the projecting region. A method for manufacturing a hydrostatic gas journal porous bearing, comprising: 2. The porous member loosely fitted into the rear end inserting portion of the cylindrical portion in the press-fitting step has a rear end side outer peripheral surface and a rear end surface connected by an inclined surface. A method of manufacturing the hydrostatic gas journal porous bearing described. the rear end surface of the housing member is positioned rearwardly of the rear end surface of the porous member;
2. The sealing step is carried out by pressing against the rear end face of the housing member a crimping die having a protrusion harder than the housing member and plastically deforming the housing member. 3. A method for manufacturing a hydrostatic gas journal porous bearing according to claim 2. Cylindrical porous member for ejecting from the inner peripheral surface the gas that has flowed in from the outer peripheral surface, and a cylindrical portion in which the porous member is inserted and a gas flow path for supplying the gas from the outside to the porous member is formed. and a hydrostatic gas journal porous bearing that supports a load in the radial direction of a shaft to be supported by gas ejected from the porous member,
The cylindrical portion of the housing member includes a front end insertion portion that is in pressure contact with the front end portion of the porous member, a rear end insertion portion that loosely fits the rear end portion of the porous member, the front end insertion portion, and the rear end. an intermediate insertion portion formed between the insertion portion and having the gas flow path;
A hydrostatic gas journal porous bearing, wherein a projecting region projecting from a rear end insertion portion of the housing member toward the porous member is in contact with a rear end portion of the porous member. 5. The hydrostatic gas journal porous bearing of claim 4, wherein said housing member is integrally formed. 6. The hydrostatic gas journal porous bearing according to claim 4, wherein the protruding region of the housing member is located rearward of the rear end surface of the porous member. .

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