JP2021042775A - Slide radial bearing device, method for bonding slide member to bearing ring of the same, and rotary work head using the same - Google Patents

Abstract

To provide a slide radial bearing device which achieves improvement of vibration-damping properties and quietness as well as improvement of load bearing, straightness, and damp performance while utilizing low friction of a rolling radial bearing device.SOLUTION: A slide radial bearing device 100 includes: a bearing ring 130 having a cylindrical inner peripheral surface which fits in an outer peripheral surface of a shaft body 110 to be rotatably supported thereby; and a thin-plate-like slide member 10 bonded to a stationary side fitting surface between the shaft body and the bearing ring. The slide member has: a lubrication oil pocket 14 enclosed at its periphery by a land part 12; and protruding parts 16 disposed in the lubrication oil pocket. A lubrication oil is supplied or discharged through first and second ports 18a, 18b opening in the lubrication oil pocket.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sliding radial bearing device that rotatably supports a rotating spindle such as a rotary work head on a spindle housing. The present invention also relates to a method of attaching a sliding member to the inner peripheral surface of a bearing ring of the sliding radial bearing device. Furthermore, the present invention relates to a rotary work head using a sliding radial bearing device.

The rotary spindle is rotatably supported by a spindle housing or the like by a sliding radial bearing such as a dynamic pressure bearing or a hydrostatic bearing, or a rolling radial bearing such as a ball bearing or a roller bearing.

Patent Document 1 describes a linear (linear motion) guide, but a guide device for a moving body in which a sliding member is attached to a moving body to support and guide the sliding member while contacting the guide surface of the support. Is described. The guide device is provided with a lubricating oil return passage that opens on the sliding surface and a lubricating oil supply passage and a lubricating oil discharge passage that communicate with each other in the lubricating oil return passage, and slides as the moving body moves. While returning the lubricating oil between the surface and the lubricating oil return passage, the lubricating oil is supplied from the lubricating oil source to the sliding surface through the lubricating oil supply passage, and from the sliding surface to the outside through the lubricating oil discharge passage. Lubricating oil is discharged to.

Japanese Unexamined Patent Publication No. 2013-09142

Compared to rolling radial bearings, sliding radial bearings have advantages such as damping characteristics against vibration (vibration damping properties), quietness, rotational accuracy, and less indentation, but friction compared to rolling radial bearings. Especially, the friction at the time of starting becomes large. Further, rolling bearings are mass-produced with highly compatible standard products and are available at low cost, whereas sliding radial bearings are individually designed and expensive.

An object of the present invention is to solve the problems of the prior art, and to provide a sliding radial bearing device having further improved vibration damping property, quietness, rotation accuracy, and load bearing capacity while taking advantage of the low friction property of the rolling bearing. It is intended to be provided.

In order to achieve the above object, according to the present invention, in a sliding radial bearing in which a shaft body or a bearing housing is rotatably and radially supported with respect to the bearing housing or the shaft body, a columnar outer peripheral surface. On a shaft body having a shaft body, a bearing ring having a cylindrical inner peripheral surface that fits on the outer peripheral surface of the shaft body, and a fitting surface of the shaft body and the bearing ring on the side held in a stationary state. A thin plate-shaped sliding member to which a sliding member is attached, has a lubricating oil pocket composed of a recess surrounded by a land portion, and has a plurality of convex portions formed in the lubricating oil pocket. A first port formed in the shaft body or the bearing ring so as to open into the lubricating oil pocket at one end of the sliding member in the rotation direction of the shaft body or the bearing ring, and the above. A sliding radial comprising a second port formed in the shaft or bearing ring at the other end of the sliding member in the direction of rotation of the shaft or bearing ring so as to open into the lubricating oil pocket. Bearing equipment is provided.

Further, according to the present invention, in the method of attaching the sliding member to the bearing ring of the sliding radial bearing device, a tapered shaft having a conical outer surface can be prepared and faced with the inner peripheral surface of the bearing ring. A hollow split collar having a positioning recess formed on the outer surface for receiving and positioning the sliding member and having an inner surface complementaryly fitted to the conical outer surface of the tapered shaft is prepared. Then, the sliding member is arranged in the positioning recess so that the back surface of the sliding member protrudes from the positioning recess, and an adhesive is applied to the back surface of the sliding member to cover the outer surface of the split collar. Arranged so as to face the inner peripheral surface of the bearing ring, the outer surface of the tapered shaft is made to face the inner surface of the split collar, inserted into the split collar, and the tapered shaft is pushed into the split collar. Provided a method in which the split collar is expanded in the radial direction.

Further, according to the present invention, in a rotary work head device that is placed on a table of a machine tool and rotatably attaches a workpiece to be machined, a spindle housing fixed to the table and a sliding radial bearing are used to attach the spindle housing to the spindle housing. Provided is a rotary work head device including a rotary spindle that is rotatably supported and a spindle motor that is arranged in the spindle housing and drives the rotary spindle to rotate.

According to the present invention, in a sliding radial bearing device that supports a shaft body and a bearing housing in a relatively rotatable radial direction, a fitting surface of the shaft body and the bearing ring on the side held in a stationary state. A thin plate-shaped sliding member is attached to the sliding member so that the lubricating oil can be supplied and discharged to the lubricating oil pocket of the sliding member through the first and second ports. While taking advantage of the low friction of the radial bearing, it is possible to further improve the vibration damping property, quietness, rotation accuracy, and load bearing capacity of the sliding radial bearing.

In addition, since the lubricating oil is supplied to the lubricating oil pocket surrounded by the land portion, it is possible to significantly reduce or prevent the leakage of the lubricating oil as compared with the conventional static pressure radial bearing, and therefore, the pressure is further increased. Lubricating oil can be supplied, and the load bearing performance can be improved.

It is a perspective view of the sliding radial bearing apparatus by a preferable embodiment of this invention which shows by pulling out the rotating shaft which is a shaft body. It is a perspective view of the sliding radial bearing apparatus of FIG. 1 which shows by inserting the shaft body into a bearing ring. It is a top view of the sliding radial bearing apparatus of FIG. It is a perspective view of the bearing ring of the sliding radial bearing apparatus of FIG. It is a top view of the sliding member used for the sliding radial bearing apparatus of FIG. It is a figure which shows the pattern of the convex part of a sliding member. It is an enlarged view of the convex part of the sliding member of FIG. It is a figure which shows the other pattern of the convex part of a sliding member. It is an enlarged view of the convex part of the sliding member of FIG. It is a figure which shows the other pattern of the convex part of a sliding member. It is an enlarged view of the convex part of the sliding member of FIG. It is a top view which shows the modification of the sliding member. It is a perspective view which shows the further modification example of the sliding member. It is sectional drawing for demonstrating the method for attaching a sliding member to a bearing ring. It is a side view which shows by breaking a part of the taper shaft used for attaching a sliding member to a bearing ring. It is sectional drawing of the positioning ring used for attaching a sliding member to a bearing ring. It is sectional drawing of the split collar used for attaching a sliding member to a bearing ring. It is sectional drawing of the washer used for attaching a sliding member to a bearing ring. It is a schematic diagram for demonstrating the structure and operation of the sliding radial bearing system using the sliding radial bearing apparatus of FIG. It is a schematic diagram for demonstrating the sliding radial bearing system when the rotating shaft rotates in the direction opposite to the case of FIG. It is a schematic diagram for demonstrating the structure and operation of another sliding radial bearing system using the sliding radial bearing apparatus of FIG. It is a schematic diagram for demonstrating the structure and operation of the sliding radial bearing system when the rotating shaft moves in the direction opposite to the case of FIG. It is a perspective view which shows the rotating shaft used in the sliding radial bearing apparatus which attached the sliding member to the shaft body. It is sectional drawing of the rotation axis of FIG. It is sectional drawing of the rotary work head using the sliding radial bearing apparatus of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
In FIGS. 1 to 4, the sliding radial bearing device 100 according to the preferred embodiment of the present invention includes a rotating shaft 110 as a shaft body, a bearing housing 120, a bearing ring 130, and a sliding member 10. The rotary shaft 110 is a columnar member, and can be, for example, a rotary spindle of a rotary work head attached to a table of a machine tool.

The bearing housing 120 includes a hollow cylindrical main body portion 124. The main body portion 124 is formed with first and second passages 126 and 128 penetrating in the radial direction from the inner peripheral surface to the outer peripheral surface. The bearing housing 120 may include a flange portion 122 for fixing the main body portion 124 to another support member (not shown). The flange portion 122 is formed with a fixing hole 122a through which a fastener such as a bolt for fixing the flange portion 122 to the support member is inserted. The fixing hole 122a penetrates the flange portion 122 in the axial direction.

The bearing ring 130 is composed of a hollow cylindrical member that fits into the hollow portion of the main body portion 124 of the bearing housing 120, and the sliding member 10 is attached to the inner peripheral surface. The bearing ring 130 has first and second ports 136 and 138 that radially penetrate from the inner peripheral surface to the outer peripheral surface of the bearing ring 130. On the outer peripheral surface of the bearing ring 130, a peripheral groove 140 extending in the circumferential direction along the outer peripheral surface is formed between the first and second ports 136 and 138. One peripheral groove 140 connects one first port 136 and one second port 138 to form a pair of first and second ports 136 and 138.

In the embodiment of FIGS. 1 to 4, the bearing ring 130 is arranged such that the first and second ports 136 and 138 forming three pairs connected by the peripheral groove 140 are aligned in the axial direction, and the three pairs are arranged. The first and second ports 136 and 138 are set as one port set, and the four port sets 136 and 138 are arranged at equal intervals in the circumferential direction of the bearing ring 130.

In each port set, the first port 136 is communicatively connected to each other by a first transverse groove 142 extending axially on the outer peripheral surface of the bearing ring 130. That is, in each port set, the first port 136 is arranged so as to be aligned in the axial direction so as to open into one first crossing groove 142.

Similarly, in each port set, the second port 138 is communicatively connected to each other by a second transverse groove 144 extending axially on the outer peripheral surface of the bearing ring 130. That is, in each port set, the second port 138 is arranged so as to be aligned in the axial direction so as to open into one second crossing groove 144.

By fitting the bearing ring 130 into the main body 124 of the bearing housing 120, the peripheral groove 140 and the inner peripheral surface of the main body 124 form a pair of first and second ports 136 and 138 in each port set. A communicating lubricating oil return passage is formed. Further, by fitting the bearing ring 130 into the main body portion 124 of the bearing housing 120, the first cross groove 142 and the inner peripheral surface of the main body portion 124 provide the three first ports 136 in each port set. A first cross-passage that communicates with each other is formed, and a second cross-passage that communicates with the second port 138 is formed by the second cross-groove 144 and the inner peripheral surface of the main body portion 124.

The bearing ring 130 is tightly fitted to the inner peripheral surface of the main body portion 124 of the bearing housing 120 so that the lubricating oil does not leak from the lubricating oil return passage and the first and second crossing passages. The bearing ring 130 can be fitted into the hollow portion of the main body portion 124 after heating the main body portion 124 of the bearing housing 120, for example. It is desirable that the main body 124 is rapidly cooled and shrink-fitted after the mating.

A thin plate-shaped sliding member 10 is attached to the inner peripheral surface of the bearing ring 130. In the present embodiment, the four sliding members 10 are attached to the inner peripheral surface of the bearing ring 130. The sliding member 10 can be made of a material having high wear resistance and a low coefficient of friction, for example, a bearing material which is formed in a thin plate shape from a fluororesin and is commercially available under the trade names of turkey and beary. The sliding member 10 scrapes the surface of the bearing member on one surface of a thin plate-shaped bearing material cut to a predetermined size by a machining center using a rotary tool such as an end mill, leaving a land portion and a convex portion. This can be manufactured by forming a lubricating oil pocket. The cutting process of the sliding member 10 is performed by fixing the sliding member 10 to the table of the machining center using a vacuum chuck.

Referring to FIG. 5, the sliding member 10 opens into a land portion 12 extending in a rectangular shape and having a predetermined width, a lubricating oil pocket 14 surrounded by the land portion 12, and a lubricating oil pocket 14. The first and second ports 18a and 18b are formed. A large number of convex portions 16 are formed in the lubricating oil pocket 14. The number and dimensions of the convex portions 16 are determined so that the total area of the surface of the convex portions 16 in the lubricating oil pocket 14 is preferably 15 to 50% of the area inside the land portion 12.

Referring to FIG. 7, the convex portion 16 has an elongated shape having a major axis Aj and a minor axis An. Both ends of the convex portion 16 along the major axis Aj are formed wider than the central portion. Preferably, the convex portion 16 is recessed in an arc shape having a radius R1 on both side portions crossing the minor axis An. Further, the convex portion 16 is bulged in an arc shape having both ends in the major axis Aj direction having a radius R2.

Further, the convex portion 16 has a major axis Aj inclined at predetermined angles α and −α (only the angle α is shown in FIG. 7) with respect to the rotational direction DR of the rotating shaft 110 with respect to the sliding member 10. Is formed to do. More specifically, as shown in FIG. 6, the convex portion 16 is regularly machined so that the inclination angles α and −α of the major axis Aj with respect to the rotation direction DR are alternately alternated. The inclination angle of the major axis Aj with respect to the rotation direction DR can be appropriately selected according to the moving speed of the rotation shaft 110.

For example, in the examples of FIGS. 6 and 7, the inclination angle α = 45 °, but as shown in FIGS. 8 and 9, the inclination angle of the convex portion 16 with respect to the rotation direction DR can be set to α = 60 °. it can. The sliding member 10 is suitable for a rotating shaft 110 that rotates at a lower speed. Alternatively, as shown in FIGS. 10 and 11, the inclination angle with respect to the rotation direction DR can be made gentle as α = 30 °. The sliding member 10 is suitable for a rotating shaft 110 that rotates at a higher speed.

As shown in FIGS. 6, 8 and 10, by arranging the convex portions 16 so that the inclination angles α and −α alternate with respect to the rotation direction DR of the rotation shaft 110, while the rotation shaft 110 rotates, Due to its viscosity, the lubricating oil in the lubricating oil pocket 14 is dragged by the surface of the rotating shaft 110 and flows in the same direction as the rotation direction DR of the rotating shaft 110, and slides when it hits the convex portion 16. It also flows to the side of the member 10, that is, in the direction of the central axis of the rotating shaft 110.

The first and second ports 18a and 18b are arranged at both ends of the sliding member 10 so as to be separated from each other in the rotation direction DR of the rotating shaft 110, and lubricating oil is provided in the thickness direction from the back surface of the sliding member 10. It is formed so as to open in the pocket 14. Further, the land portion 12 surrounding the lubricating oil pocket 14 is formed at substantially the same height as the convex portion 16 in the lubricating oil pocket 14, and the surfaces of the land portion 12 and the convex portion 16 are the outer periphery of the rotating shaft 110. While in direct contact with the surface, it slides relative to the rotating shaft 110.

In the illustrated embodiment, four sliding members 10 having the same shape and dimensions are attached to the inner peripheral surface of the bearing ring 130, but the sliding members 10 having different shapes and dimensions or different depending on the application. A sliding member 10 having a convex portion 16 in shape and arrangement can be attached.

Further, in the above-described embodiment, the sliding member 10 has a rectangular land portion 12, but the sliding member 10 is not limited to this, and as shown in the sliding member 10'in FIG. 12, the rotation direction of the rotating shaft 110 The land portions 12a and 12b at both ends of the DR can be corrugated to promote the inflow of lubricating oil into the first and second ports 18a and 18b.

Further, in the above-described embodiment, four sliding members 10 are attached to the bearing ring 130, but the present invention is not limited to this, and more or less than four sliding members 10 are attached. It may be attached to the bearing ring 130. Alternatively, as shown in FIG. 13, one sliding member 10 ″ may be used in a cylindrical shape. The sliding member 10 ″ includes a land 12 ′ similar to the sliding member 10 and the land 12 ′. It has a large number of protrusions 16'arranged in a lubricating oil pocket 14' surrounded by. The lubricating oil pocket 14'is processed by attaching an end mill to the angle head. The sliding member 10 ″ further has a supply port 18a ′ and a discharge port 18b ′ penetrating the sliding member 10 ″ in the thickness direction, and the supply port 18a ′ and the discharge port 18b ′ are of the cylinder. It is located on the opposite side of the diameter. The number and arrangement of the supply port 18a'and the discharge port 18b' are not limited to those shown in FIG. 13, and may be appropriately selected depending on the diameter of the rotating shaft 110, the axial dimension of the sliding member 10 ″, and the like. Can be done.

Next, a method of attaching the sliding member 10 to the inner peripheral surface of the bearing ring 130 will be described with reference to FIGS. 14 to 18.
The sliding member 10 is attached to the inner peripheral surface of the bearing ring 130 by using a jig including a taper shaft 200, a positioning ring 210, a split collar 220, a washer 230, and a fixing bolt 240 as shown in FIGS. 14 to 18. can do.

Referring to FIG. 15, the taper shaft 200 includes a disk or columnar end plate 202, a conical portion 204 provided on one end surface side of the end plate 202 and having a conical outer surface 204a, and an end plate 202. It has a mating portion 206 provided between the conical portion 204 and the conical portion 204. A screw hole 204b having an internal screw is formed from the tip surface 204c of the conical portion 204 along the central axis of the tapered shaft 200.

Further, in the end plate 202, the end surface 202a provided with the matching portion 206 serves as an annular reference surface with which the positioning ring 210 abuts. The combined portion 206 has a disk or cylindrical shape coaxial with the conical portion 204, and has a diameter equal to or larger than the diameter of the bottom surface at which the diameter of the conical portion 204 is maximum.

Referring to FIG. 16, the positioning ring 210 is a substantially hollow cylindrical member, and has a small diameter portion 212 and a large diameter portion 214. The small diameter portion 212 has an inner peripheral surface having an inner diameter equal to the diameter of the mating portion 206 of the taper shaft 200. The large diameter portion 214 has an inner diameter slightly larger than the inner diameter of the bearing ring 130 to which the sliding member 10 is attached. In the positioning ring 210, the end surface 216 adjacent to the small diameter portion 212 is a seating surface seated on the reference surface 202a of the tapered shaft 200, and the end surface 218 adjacent to the large diameter portion 214 is the end surface of the bearing ring 130. It is a contact surface that comes into contact with each other.

Referring to FIG. 17, the split collar 220 is a hollow member having a conical inner surface 222, and has a tip surface 224 having a maximum inner diameter, a base end surface 226 having a minimum inner diameter, and a cylindrical outer peripheral surface. It has 228 and. The split collar 220 has a slit (not shown) extending in the axial direction from the tip surface 224, and the tip side can be expanded in the radial direction. A predetermined number of positioning recesses 228a for arranging four sliding members 10 in the above-described embodiment are formed on the outer peripheral surface 228.

Referring to FIG. 18, the washer 230 is a disc-shaped or cylindrical member having a center hole 232 penetrating in the axial direction at the center.

When the sliding member 10 is attached to the inner peripheral surface of the bearing ring 130, the small diameter portion 212 of the positioning ring 210 is attached to the taper shaft 200 so that the seating surface 216 of the positioning ring 210 abuts on the reference surface 202a of the taper shaft 200. It is fitted to the mating portion 206 of.

Next, the lubricating oil pocket 14 of the sliding member 10 is made to face the bottom surface of the positioning recess 228a, and the sliding member 10 is arranged in the positioning recess 228a. At this time, the back surface of the sliding member 10 on the side opposite to the lubricating oil pocket 14 is exposed from the positioning recess 228a. Adhesive is applied to this back surface.

Next, the split collar 220 is fitted to the conical portion 204 of the taper shaft 200. At this time, the tip of the split collar 220 is inserted into the space between the conical portion 204 of the taper shaft 200 and the large diameter portion 214 of the positioning ring 210. At the tip of the split collar 220, the outer peripheral surface 228 of the split collar 220 comes into contact with the inner peripheral surface of the large diameter portion 214 of the positioning ring 210, so that the range in which the split collar 220 can be expanded is limited.

Next, the bearing ring 130 is fitted to the outer peripheral surface of the split collar 220. At this time, the bearing ring 130 is provided with respect to the outer peripheral surface of the split collar 220 so that the first and second ports 136 and 138 communicate with the first and second ports 18a and 18b of the sliding member 10. Positioned. When the bearing ring 130 is fitted to the outer peripheral surface of the split collar 220, the end surface of the bearing ring 130 comes into contact with the contact surface 218 of the positioning ring 210.

Next, the washer 239 is arranged so as to abut on the base end surface 226 of the split collar 220, the fixing bolt 240 is inserted into the center hole 232, and the washer is screwed into the internal screw of the screw hole 204b of the taper shaft 200. By tightening the fixing bolt 240, the split collar 220 expands in the radial direction, and the sliding member 10 arranged on the outer peripheral surface 228 thereof is pressed against the inner peripheral surface of the bearing ring 130. At this time, as described above, at the tip of the split collar 220, the outer peripheral surface of the split collar 220 comes into contact with the inner peripheral surface of the large diameter portion 214 of the positioning ring 210, so that the upper limit of the split collar 220 can be expanded. Is determined.

After screwing the fixing bolt 240, the taper shaft 200, the positioning ring 210, the split collar 220, the washer 230, and the fixing bolt 240 are held in a fixed state until a predetermined time required for the adhesive to cure elapses. Will be done. Depending on the adhesive applied to the back surface of the sliding member 10, the fixing bolt 240 may be screwed and then placed in a heater such as an incubator as it is to maintain a predetermined high temperature for a predetermined time. .. The inner peripheral surface of the sliding member 10 attached to the bearing ring 130 is finished by cutting or grinding.

A sliding radial bearing system using the sliding radial bearing device 100 according to the above-described embodiment will be described with reference to FIGS. 19 and 20. In FIGS. 19 and 20, the sliding radial bearing system 300 includes a rotating shaft 310 and a sliding radial bearing 302 that supports the rotating shaft 310. The sliding member 10 shown in FIG. 5 is attached to the inner peripheral surface of the sliding radial bearing 302. Instead of the sliding member 10, the sliding member 10'of FIG. 12 or the sliding member 10 "of FIG. 13 may be used.

Referring to FIGS. 19 and 20, the rotating shaft 310 is formed by the rotating shaft 110 in the above-described embodiment, and the sliding radial bearing 302 is formed by the bearing ring 130 and the bearing housing 120.

The sliding radial bearing 302 includes a lubricating oil return passage 304, a first passage 306 communicating with the first port 18a of the sliding member 10, and a second passage 308 communicating with the second port 18b of the sliding member 10. And have. The lubricating oil return passage 304 is formed by the peripheral groove 140 of the bearing ring 130. The first passage 306 is formed by the first port 136 of the bearing ring 130 and the first passage 126 of the bearing housing 120. The second passage 308 is formed by a second port 138 of the bearing ring 130 and a second passage 128 of the bearing housing 120.

The lubricating oil is supplied from the lubricating oil supply device 320 to the first passage 306 via the lubricating oil supply line 322, and is collected from the second passage 308 to the lubricating oil supply device 320 via the lubricating oil discharge line 324. Will be done. The lubricating oil supply device 320 cools the lubricating oil tank 326 for storing the lubricating oil recovered from the sliding member 10 via the second passage 308 and the lubricating oil discharge pipeline 324, and controls the temperature to be constant. Provided on the discharge side of the pump 330 and the pump 330, which suck the lubricating oil from the lubricating oil temperature control device 328 and the lubricating oil tank 326 and pump the lubricating oil to the first passage 306 via the lubricating oil supply pipeline 322. The pump 330 is provided with an accumulator 332 that removes pulsations generated in the lubricating oil. The accumulator 332 may be omitted if a pump with less pulsation is used or if the influence of pulsation is not a problem. The lubricating oil temperature control device 328 and the pump 330 are controlled by the lubricating oil control device 340. The lubricating oil control device 340 can be configured as, for example, a part of a machine to which the sliding radial bearing system 300 is applied, for example, a machine control device (not shown) of a machine tool, or a part of an NC device.

Further, the lubricating oil tank 326 divides the internal space into a receiving side tank 326a and a supply side tank 326b by a partition wall 326c, and stores new lubricating oil and lubricating oil from the lubricating oil discharge pipeline 324 in the receiving side tank 326a. Then, the lubricating oil stored in the receiving side tank 326a is temperature-adjusted by the lubricating oil temperature control device 328 and stored in the supply side tank 326b, and the lubricating oil is slid from the supply side tank 326b by the pump 330 and the radial bearing 302. Can be supplied to.

The direction in which the rotating shaft 310 is directed from the first port 18a to the second port 18b of the sliding member 10 relative to the sliding radial bearing 302 as shown by the arrow DR1 in FIG. 19 (counterclockwise in FIG. 19). When rotating in the clockwise direction), the lubricating oil in the lubricating oil pocket 14 is dragged by the outer surface of the rotating shaft 310 due to its viscosity, as shown by the arrow L1, and is relative to the sliding member 10. Moves to the second port 18b side. As a result, in the lubricating oil pocket 14, the second port 18b side, which is the front side in the rotation direction of the rotating shaft 310, becomes relatively high pressure, and the first port 18a side becomes low pressure. Therefore, a part of the low-temperature lubricating oil supplied from the lubricating oil supply device 320 to the first passage 306 via the lubricating oil supply pipeline 322 flows into the lubricating oil pocket 14 from the first port 18a. The remaining portion circulates in the lubricating oil return passage 304 toward the second passage 308.

The lubricating oil that has flowed into the lubricating oil pocket 14 flows through the lubricating oil pocket 14 toward the second port 18b side, and flows from the second port 18b through the second passage 308 and the lubricating oil discharge pipeline 324. It is recovered to the lubricating oil supply device 320 via. When the lubricating oil flows through the lubricating oil pocket 14, the lubricating oil whose temperature has risen due to the sliding in the lubricating oil pocket 14 is seconded by the low-temperature lubricating oil newly supplied from the first port 18a. It is discharged from the lubricating oil pocket 14 through the port 18b of the above. The sliding member 10 and the rotating shaft 310 are cooled by the replacement action of the lubricating oil.

The direction in which the sliding radial bearing 302 is directed from the second port 18b of the sliding member 10 to the first port 18a relative to the sliding radial bearing 302 as shown by the arrow DR2 in FIG. 20 (clock in FIG. 20). When rotating in the clockwise direction), the lubricating oil in the lubricating oil pocket 14 is dragged by the outer surface of the rotating shaft 310 due to its viscosity, as shown by the arrow L2, and is relative to the sliding member 10. Moves to the first port 18a side. As a result, in the lubricating oil pocket 14, the first port 18a side, which is the front side in the rotation direction of the rotating shaft 310, becomes relatively high pressure, and the second port 18b side becomes low pressure. The lubricating oil whose temperature has risen due to sliding in the lubricating oil pocket 14 flows out from the first port 18a toward the first passage 306 and merges with the low-temperature lubricating oil from the first passage 306. The minute temperature drops and the oil flows into the lubricating oil return passage 304. A part of the lubricating oil flowing in the lubricating oil return passage 304 flows into the lubricating oil pocket 14 from the second port 18b, and the remaining part passes through the second passage 308 and the lubricating oil discharge pipe 324. It is collected in the lubricating oil supply device 320.

When the lubricating oil circulates in the lubricating oil pocket 14, the temperature-increased lubricating oil previously existing in the lubricating oil pocket 14 has a slightly lower temperature newly supplied from the second port 18b. The lubricating oil is discharged from the lubricating oil pocket 14 through the first port 18a. The sliding member 10 and the rotating shaft 310 are cooled by the replacement action of the lubricating oil.

According to the present embodiment, the lubricating oil between the sliding member 10 and the outer surface of the rotating shaft 310 can be directly cooled, and the heat generating region of the sliding member 10 and the outer surface of the rotating shaft 310 can be directly cooled. Become. Further, since the lubricating oil is supplied to the lubricating oil pocket 14 surrounded by the land portion 12 formed on the sliding member 10, the amount of lubricating oil leaking from between the sliding member 10 and the outer surface of the rotating shaft 310. Is reduced. Further, by adjusting the pressure of the lubricating oil supplied to the lubricating oil pocket 14, the load capacity in the radial direction of the sliding radial bearing device 100 can be increased or decreased.

Other embodiments of the sliding radial bearing system will be described with reference to FIGS. 21 and 22.
In FIGS. 21 and 22, the sliding radial bearing system 500 includes a rotating shaft 504 and a sliding radial bearing 502 that supports the rotating shaft 504. The sliding member 10 shown in FIG. 5 is attached to the inner peripheral surface of the sliding radial bearing 502. Instead of the sliding member 10, the sliding member 10'of FIG. 12 or the sliding member 10 ″ of FIG. 13 may be used. The rotating shaft 504 is formed by the rotating shaft 110 in the above-described embodiment, and is a sliding radial bearing. The 502 is formed by a bearing ring 130 and a bearing housing 120.

The sliding radial bearing 502 has a first passage 506 communicating with the first port 18a of the sliding member 10 and a second passage 508 communicating with the second port 18b of the sliding member 10. .. The first passage 506 is formed by the first port 136 of the bearing ring 130 and the first passage 126 of the bearing housing 120. The second passage 508 is formed by a second port 138 of the bearing ring 130 and a second passage 128 of the bearing housing 120. The bearing housing 120 does not include a lubricating oil return passage.

The first and second passages 506 and 508 are connected to the switching valve 518 via the first and second pipelines 510 and 512. The switching valve 518 is connected to a lubricating oil supply device (not shown) by a lubricating oil supply line 514 and a lubricating oil discharge line 516. The lubricating oil supply device can be the same lubricating oil supply device as the lubricating oil supply device 320 of FIGS. 19 and 20.

As an example, the switching valve 518 can be a 2-position 4-port directional control valve having a solenoid 520. The solenoid 520 is connected to the solenoid control device 530 of the switching valve 518. The solenoid control device 530 is configured as, for example, a part of the lubricating oil control device 340 for the lubricating oil supply device 320 of FIGS. 19 and 20, or a machine to which the sliding radial bearing system 500 is applied, for example, a machine tool. It can be configured as part of a machine control device (not shown) or as part of an NC device. The switching valve 518 moves from the first position shown in FIG. 21 to the second position shown in FIG. 22 when the solenoid 520 is excited by the solenoid control device 530. When the solenoid 520 is degaussed, it moves from the second position to the first position by the urging force of the spring 522.

When the switching valve 518 is in the first position, the first line 510 communicates with the lubricating oil supply line 514 and the second line 512 communicates with the lubricating oil discharge line 516. When the switching valve 518 is in the second position, the first line 510 communicates with the lubricating oil discharge line 516 and the second line 512 communicates with the lubricating oil supply line 514.

A pressure reducing valve 524 can be arranged in the lubricating oil supply line 514. The pressure reducing valve 524 supplies lubrication to the lubricating oil pocket 14 according to, for example, the load torque of the spindle motor (not shown) of a machine to which the radial bearing system 500 is applied, for example, the rotation speed of the rotating shaft 310, and the like. It can be a pressure control valve that regulates the oil pressure (backup pressure). A back pressure valve 526 can be arranged in the lubricating oil discharge pipe 516. The back pressure valve 526 can be a pressure control valve that adjusts the pressure so that the pressure in the lubricating oil pocket 14 (the pressure on the upstream side of the lubricating oil discharge pipe 516) becomes a predetermined value.

In FIG. 21, the rotation shaft 504 rotates in the direction from the first port 18a of the sliding member 10 to the second port 18b (counterclockwise direction in FIG. 21) as shown by the arrow DR1 in FIG. At that time, the lubricating oil in the lubricating oil pocket 14 is dragged by the outer surface of the rotating shaft 504 due to its viscosity, as shown by the arrow L1, and the second port 18b is relative to the sliding member 10. Move to the side. At this time, the solenoid control device 530 degausses the solenoid 520 and moves the switching valve 518 from the second position to the first position by the urging force of the spring 522. As a result, the high-temperature lubricating oil in the lubricating oil pocket 14 is discharged to the lubricating oil supply device via the second port 18b, the second pipeline 512, the switching valve 518, and the lubricating oil discharge pipeline 516. A new low-temperature lubricating oil is supplied from the lubricating oil supply device into the lubricating oil pocket 14 via the lubricating oil supply line 514, the switching valve 518, the first line line 510, and the first port 18a. As a result, the sliding member 10 and the rotating shaft 504 are cooled.

In FIG. 22, the rotation shaft 504 rotates in the direction from the second port 18b of the sliding member 10 to the first port 18a (clockwise in FIG. 22) as shown by the arrow DR2 in FIG. At this time, the lubricating oil in the lubricating oil pocket 14 is dragged by the outer surface of the rotating shaft 504 due to its viscosity, as shown by the arrow L2, and is on the first port 18b side relative to the sliding member 10. Move to. At this time, the solenoid control device 530 excites the solenoid 520, and the switching valve 518 is driven to the second position. As a result, the high-temperature lubricating oil in the lubricating oil pocket 14 is discharged to the lubricating oil supply device via the first port 18a, the first pipeline 510, the switching valve 518, and the lubricating oil discharge pipeline 516. , New low temperature lubricating oil is supplied from the lubricating oil supply device into the lubricating oil pocket 14 via the lubricating oil supply line 514, the switching valve 518, the second line line 512, and the second port 18b. Cools the sliding member 10 and the rotating shaft 504.

In the embodiments of FIGS. 19 and 20, when the rotating shaft 310 rotates to the second port 18b side, more lubricating oil from the lubricating oil supply device 320 than when moving to the first port 18a side in the opposite direction. Is supplied to the sliding member 10, and non-uniformity of the lubricating oil supply temperature with respect to the moving direction of the rotating shaft 310 occurs.

On the other hand, in the embodiment of FIGS. 21 and 22, the switching valve 518 connects the first and second ports 18a and 18b of the sliding member 10 to the lubricating oil supply line 514 and the lubricating oil discharge line. It is designed to switch between 516 and. As a result, the entire amount of the heated lubricating oil in the lubricating oil pocket 14 is discharged from the port of the first and second ports 18a and 18b that is on the front side in the rotation direction of the rotating shaft 350, and is newly supplied. Since the entire amount of the low-temperature lubricating oil to be supplied is supplied from the port on the leading side, the temperature and the supply amount of the lubricating oil do not change depending on the moving direction of the rotating shaft 504.

In the above-described embodiment, the sliding member 10 is attached to the peripheral surface without the stationary bearing ring 130, but the present invention is not limited to this configuration.
With reference to FIGS. 23 and 24, in the modified embodiment of the present invention, the sliding member 10 is attached to the outer peripheral surface of the rotating shaft 310.

In FIGS. 23 and 24, four sliding members 10 are attached to the outer peripheral surface 402 of the rotating shaft 400. The sliding members 10 are arranged at equal intervals in the circumferential direction of the rotating shaft 400. The rotating shaft 400 has first and second radial orientations so as to communicate with the first and second ports 18a and 18b of the sliding member 10 attached to the outer peripheral surface 402 of the rotating shaft 400. Ports 406 and 408 are formed. The rotating shaft 400 is further formed with a lubricating oil return passage 404 extending between the first and second ports 406 and 408. One end of the lubricating oil return passage 404 is closed with a plug 404a.

The rotary shaft 400 further communicates with the lubricating oil return passage 404, and has first and second passages (not shown) connected to the lubricating oil supply pipes 322 and 514 and the lubricating oil discharge pipes 324 and 516. It is formed. The first and second passages can be formed to open axially at the end of the rotating shaft 400 and rotate to supply fluid to a rotating body such as a rotary joint (not shown). The device can be used to connect to the lubricating oil supply device 320.

A rotary work head using the sliding radial bearing device of the present invention will be described with reference to FIG. 25.
In FIG. 25, the rotary work head 600 is a device for rotatably attaching a work W to be placed, fixed, and machined on a table 624 of a machine tool. The rotary workhead 600 has a hollow cylindrical spindle housing 612 fixed to the table 624 and a rotary spindle 606 rotatably supported by the spindle housing 612. The rotary spindle 606 is rotatably supported by a front radial bearing 630 and a rear radial bearing 620.

A face plate 618 is fixed to the tip of the rotary spindle 606, and the work W is attached to the face plate 618. A rotor 608 is fixed to the outer peripheral surface on the rear end side of the rotary spindle 606. A stator 610 is fixed to the inner peripheral surface of the spindle housing 612 so as to face the rotor 608. The rotor 608 and the stator 610 form a built-in motor for the rotary workhead 600.

In the spindle housing 612, the opening on the rear end side is closed by the rear end plate 602, and the opening on the front end side is closed by the front end plate 604. A rear radial bearing 620 made of the sliding radial bearing device of the present invention is fitted and fixed to the central opening 602a of the rear end plate 602.

The rear radial bearing 620 has a bearing ring 622 that fits into the central opening 602a of the rear end plate 602, and a plurality of sliding members 10 are attached to the inner peripheral surface of the bearing ring 622. One annular sliding member 10 ″ (see FIG. 13) may be used. The bearing ring 622 has first and second rings communicating with the first and second ports 18a and 18b of the sliding member 10. The ports 624a and 624b are formed in the radial direction, and the rear end plate 602 is formed with first and second passages 626a and 626 communicating with the first and second ports 624a and 624b in the radial direction. In this example, the bearing housing is formed by a rear end plate 602.

The front radial bearing 630 has a bearing ring 632 that fits on the inner peripheral surface of the spindle housing 612, and a plurality of sliding members 10 are attached to the inner peripheral surface of the bearing ring 632. One annular sliding member 10 ″ may be used. The bearing ring 632 has first and second ports 634a, 634b communicating with the first and second ports 18a, 18b of the sliding member 10. The spindle housing 612 is formed in the radial direction, and the first and second passages 636a and 636 communicating with the first and second ports 634a and 634b are formed in the radial direction.

The sliding thrust bearing 640 is configured on a principle similar to that of the sliding radial bearings 620, 630, and the axial load acting on the rotating spindle 606 is supported by the spindle housing 612 and the front end plate 604. In the sliding thrust bearing 640, a sliding member is attached to the spindle housing 612 and the front end plate 604 facing the flange portion perpendicular to the axis formed on the rotating spindle 604, and the lubricating oil pocket formed in the sliding member is filled with lubricating oil. Is supplying. The frictional force acting on the flange when bolting the front end plate 604 to the spindle housing 612 is adjusted by the thickness of the spacer 642.

10 Sliding member 12 Land part 14 Lubricating oil pocket 16 Convex part 100 Sliding radial bearing device 110 Rotating shaft 120 Bearing housing 130 Bearing ring 200 Tapered shaft 210 Positioning ring 220% Color 300 Sliding radial bearing system 500 Sliding radial bearing system 600 Rotary work Head 606 Rotating Spindle 612 Spindle Housing 620 Rear Radial Bearing 630 Front Radial Bearing

Claims (6)

In a sliding radial bearing device that supports the shaft body and the bearing housing in the radial direction so as to be relatively rotatable.
A shaft body having a cylindrical outer peripheral surface and
A bearing ring attached to the bearing housing and having a cylindrical inner peripheral surface that fits on the outer peripheral surface of the shaft body.
A thin plate-shaped sliding member attached to the fitting surface of the shaft body and the bearing ring on the side held in a stationary state, and a lubricating oil pocket composed of a recess surrounded by a land portion. A sliding member having a plurality of convex portions formed in the lubricating oil pocket, and
A first port formed in the shaft body or the bearing ring so as to open into the lubricating oil pocket at one end of the sliding member in the rotation direction of the shaft body or the bearing ring.
A second port formed in the shaft or bearing ring so as to open into the lubricating oil pocket at the other end of the sliding member in the direction of rotation of the shaft or bearing ring.
A sliding radial bearing device characterized by being equipped with. The sliding radial bearing device according to claim 1, wherein the bearing ring has a lubricating oil return passage formed so as to communicate with the first and second ports. The first port is connected to the pump of the lubricating oil supply device via the lubricating oil supply line, and the second port is connected to the tank of the lubricating oil supply device via the lubricating oil discharge line. The sliding radial bearing device according to claim 1. The sliding member is attached to the inner peripheral surface of the bearing ring, and the first and second ports are formed on the bearing ring.
The first and second ports are connected to a lubricating oil supply line connected to the pump of the lubricating oil supply device via a switching valve and a lubricating oil discharge line connected to the tank of the lubricating oil supply device. The switching valve connects the first port to the lubricating oil discharge pipeline when the shaft body rotates in the direction from the second port to the first port. , The second port is connected to the lubricating oil supply pipeline, and when the shaft body rotates in the direction from the first port to the second port, the first passage is lubricated. The sliding radial bearing device according to claim 1, wherein the second port is connected to the lubricating oil discharge pipeline while being connected to the oil supply pipeline. In the method of attaching the sliding member to the bearing ring of the sliding radial bearing device according to any one of claims 1 to 4.
Prepare a tapered shaft with a conical outer surface,
It is formed so as to face the inner peripheral surface of the bearing ring, has a positioning recess formed on the outer surface for receiving and positioning the sliding member, and has an inner surface that complementarily fits on the conical outer surface of the tapered shaft. Prepare a hollow split collar
The sliding member is arranged in the positioning recess so that the back surface of the sliding member protrudes from the positioning recess.
An adhesive is applied to the back surface of the sliding member,
The outer surface of the split collar is arranged so as to face the inner peripheral surface of the bearing ring.
The outer surface of the taper shaft is made to face the inner surface of the split collar, and the taper shaft is inserted into the split collar.
A method in which the split collar is expanded in the radial direction by pushing the taper shaft into the split collar. In a rotary work head that is placed on the table of a machine tool and rotatably attaches the workpiece to be machined.
The spindle housing fixed to the table and
At least a rotating spindle that is rotatably supported by the radial bearing in the spindle housing,
It is provided with a spindle motor which is arranged in the spindle housing and drives the rotary spindle to rotate.
A rotary work head in which the radial bearing is the sliding radial bearing device according to any one of claims 1 to 4.

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