JP2021042777A - Slide circular motion guide device and rotary work head using the same - Google Patents

Abstract

To provide a slide circular motion guide device which has high rigidity and low friction of a cross roller bearing and achieves improvement of vibration-damping properties and quietness.SOLUTION: A circular motion guide device 10 includes: a shaft body 40 including truncated cone portions 42, 44 having conical surfaces 42a, 44b in which a diameter gradually reduces from a maximum outer diameter along a center axis O; and base members 20, 30 having support surfaces 22a, 32a facing the conical surfaces of the shaft body. Slide members 70 are bonded to the conical surfaces of the shaft body or the support surfaces of the base member to form slide surfaces.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sliding circular motion guide device that rotatably supports a rotating spindle such as a rotary table or a rotary work head with respect to a spindle housing in the radial and axial directions. The present invention also relates to a method of attaching a sliding member to a support surface of the sliding circular motion guide device. Furthermore, the present invention relates to a rotary work head using a sliding circular motion guide device.

The rotating spindle is rotatably supported by a spindle housing or the like by ball bearings or roller bearings. Since such a rolling radial bearing cannot support a rotating spindle with respect to an axial load, it may be combined with a rolling thrust bearing, or a cross roller bearing may be used instead of a ball 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

Cross-roller bearings have low friction and exhibit much higher load bearing capacity (high rigidity) than ball bearings against shaft bending moment load, shaft radial load and thrust load, while being dampening. There is a problem that the vibration cannot be reduced and the roundness accuracy of rotation is not high. Further, the cross roller bearing has a problem that it becomes relatively expensive.

An object of the present invention is to solve the problems of the prior art, and while taking advantage of the high rigidity and low friction of the cross roller bearing, the vibration damping property, the quietness, the rotation accuracy, and the load bearing property are further improved. Another object of the present invention is to provide a sliding circular motion guide device that is easy to manufacture.

In order to achieve the above object, according to the present invention, in a circular motion guide device attached between a support and a moving body that relatively circularly move around a common central axis, along the central axis. A sliding circle comprising a shaft body including at least one truncated cone portion having an inclined outer peripheral surface whose diameter gradually decreases from the maximum outer diameter, and a bearing member having an inclined inner peripheral surface facing the inclined outer peripheral surface of the shaft body. An exercise guide device is provided.

Further, according to the present invention, in the method of attaching the sliding member to the sliding circular motion guide device, a thin plate-shaped sliding member is prepared and has a conical portion that gradually expands along the central axis. A tapered member having a positioning recess formed on the outer surface of the conical portion for receiving and positioning the sliding member is prepared, and the sliding member is inserted into the positioning recess so that the back surface of the sliding member protrudes from the positioning recess. The sliding member is arranged, an adhesive is applied to the back surface of the sliding member, and the tapered member is arranged with respect to the bearing member so that the outer surface of the conical portion faces the inner peripheral surface of the bearing member. Then, while the outer surface of the tapered member faces the inner peripheral surface of the bearing member, the sliding member is pressed against the inner peripheral surface of the bearing member by pushing the tapered member into the bearing member. The method is provided.

Further, according to the present invention, in a rotary work head that is placed on a table of a machine tool and rotatably attaches a workpiece to be machined, the spindle housing fixed to the table and the spindle housing by the sliding circular motion guide device are used. Provided is a rotary work head 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, since the sliding circular motion guide device is configured between the inclined outer peripheral surface of the shaft body and the inclined inner peripheral surface of the bearing member, the vibration damping property is improved. Further, a sliding member is attached to either the inclined outer peripheral surface of the shaft body or the inclined inner peripheral surface of the bearing member, and this is used as a sliding surface when the shaft body and the bearing member make a relative circular motion. Therefore, it is possible to further improve the vibration damping property, quietness, rotation accuracy, and load bearing capacity while taking advantage of the low friction property of the cross roller bearing.

It is sectional drawing of the sliding circular motion guide device by a preferable embodiment of this invention. It is an exploded view of the sliding circular motion guide device of FIG. It is sectional drawing of the 1st base member of the sliding circular motion guide device of FIG. It is a top view of the first base member of FIG. It is a top view of the 1st base member shown together with the sliding member attached to the bearing surface. It is a top view of the sliding member. It is an enlarged view of the convex part of the sliding member of FIG. It is a top view which shows another example of a sliding member. It is sectional drawing of the jig for attaching a sliding member to a bearing surface. It is sectional drawing which shows the washer of the jig of FIG. It is sectional drawing of the taper member of the jig of FIG. It is sectional drawing which shows the modification of the base member. It is a side view of the bearing member of the base member of FIG. It is a schematic diagram for demonstrating the structure and operation of the slide bearing system using the slide circular motion guide device of this invention. It is a schematic diagram for demonstrating the slide 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 slide bearing system using a slide circular motion guide device. It is a schematic diagram for demonstrating the structure and operation of the slide bearing system when the rotating shaft moves in the direction opposite to the case of FIG. It is sectional drawing of the rotary work head using the sliding circular motion guide device of this invention. It is sectional drawing which shows the other example of a rotary work head.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
In FIGS. 1 to 5, the sliding circular motion guide device 10 according to the preferred embodiment of the present invention includes a rotating shaft 40 as a shaft body, first and second base members 20 and 30 as bearing members, and a spacer 50. It has. The rotating shaft 40 has a truncated cone portion 42, 44 and a columnar first and second shaft portions 46, 48 protruding from the ends of the truncated cone portions 42, 44 along the central axis O. For example, it can be a rotating spindle of a work head attached to a table of a machine tool.

The truncated cone portion has at least one truncated cone portion, 42, 44 in the present embodiment. The truncated cone portion adjacent to the first shaft portion 46 is referred to as the first truncated cone portion 42, and the truncated cone portion adjacent to the second shaft portion 48 is referred to as the second truncated cone portion 44. Each of the first and second truncated cone portions 42 and 44 forms conical surfaces 42a and 44a. The conical surfaces 42a and 44a form an inclined outer peripheral surface whose radius gradually decreases along the central axis O toward the adjacent first and second shaft portions 46 and 48. The maximum diameter is between the first and second truncated cone portions 42, 44. In the present embodiment, a cylindrical or disk-shaped joint portion 40a having a maximum outer diameter is provided between the first and second truncated cone portions 42 and 44.

Referring to FIG. 3, the first base member 20 is composed of a flat plate-shaped member having end faces 20a and 20b separated along the central axis O. At least one of the end faces 20a and 20b, in the present embodiment, the end face 20a is formed perpendicular to the central axis O, and is referred to as a connecting surface in the present specification. The end surface 20b on the side opposite to the end surface 20a which is the bonding surface is referred to as an outer end surface 20b in the present specification.

The first base member 20 has a recess 22 that opens in the joint surface 20a and a shaft hole 24 that opens in the outer end surface 20b. A bolt hole 20c on which an internal screw is formed is further formed on the joint surface 20a. The bolt holes 20c are arranged around the central axis O at equal angular intervals.

The inner peripheral surface of the recess 22 forms a conical bearing surface 22a that is rotationally symmetric with respect to the central axis O. A sliding member 70 as a thin plate-shaped low-friction resin member is attached to the bearing surface 22a. In this embodiment, four sliding members 70 are attached to the bearing surface 22a. Further, the shaft hole 24 forms a cylindrical inner peripheral surface extending along the central axis O, and receives the first shaft portion 46 of the rotating shaft 40.

The first base member 20 further has first ports 26a and 26b and second ports 28a and 28b that axially penetrate from the bearing surface 22a of the first base member 20 to the outer end surface 20b. ing. The two first ports 26a, 26b are arranged so as to be radially aligned (see FIG. 4) and separated from each other. Here, regarding the "radial direction", the two first ports 26a and 26b are arranged on a straight line parallel to the radius in the illustrated embodiment, and are not aligned in the radial direction in a strict sense. However, in the present specification, such an arrangement is included in the "radial direction".

Similarly, the two second ports 28a, 28b are arranged so as to be radially aligned and separated from each other. Further, the first ports 26a and 26b and the second ports 28a and 28b are arranged at a predetermined angle around the central axis O, and 90 ° apart in the illustrated embodiment. The two first ports 26a and 26b and the two second ports 28a and 28b arranged in this way are used as one port set at equal angular intervals in the circumferential direction, and in the illustrated embodiment, every 90 °. Four sets are arranged.

Further, in the illustrated embodiment, the first ports 26a and 26b and the second ports 28a and 28b extend parallel to the central axis O from the bearing surface 22a to the outer end surface 20b. Not limited to this, the first ports 26a and 26b and the second ports 28a and 28b may be extended so as to be inclined with respect to the central axis O.

Within each port set, the first port 26a and the second port 28a, and the first port 26b and the second port 28b arranged in the circumferential direction are the lubricating oil return pipe 60 as the lubricating oil return passage. , 62 are connected on the outer end surface 20b side.

The second base member 30 is formed in substantially the same manner as the first base member 20, is a flat plate-shaped member having a connecting surface 30a and an outer end surface 30b, and is a recess 32 that opens into the connecting surface 30a. And a shaft hole 34 that opens to the outer end surface 30b. A plurality of through holes 30c are formed so as to penetrate from the outer end surface 30b to the joint surface 30a. The through holes 30c are arranged around the central axis O at equal angle intervals, and fixing bolts 54 screwed into the bolt holes 20c of the first base member 20 are inserted.

The inner peripheral surface of the recess 32 forms a conical bearing surface 32a that is rotationally symmetric with respect to the central axis O. A sliding member 70 as a thin plate-shaped low-friction resin member is attached to the bearing surface 32a. In this embodiment, four sliding members 70 are attached to the bearing surface 32a. Further, the shaft hole 34 forms a cylindrical inner peripheral surface extending along the central axis O, and receives the second shaft portion 48 of the rotating shaft 40.

The second base member 30 further has first ports 36a and 36b and second ports 38a and 38b that axially penetrate from the bearing surface 32a of the second base member 30 to the outer end surface 30b. ing. The two first ports 36a, 36b are arranged so as to be aligned in the radial direction and separated from each other. Similarly, the two second ports 38a, 38b are arranged so as to be radially aligned and separated from each other.

Further, the first ports 36a and 36b and the second ports 38a and 38b are arranged at a predetermined angle around the central axis O, and 90 ° apart in the illustrated embodiment. The two first ports 36a and 36b and the two second ports 38a and 38b arranged in this way are used as one port set at equal angular intervals in the circumferential direction, and in the illustrated embodiment, every 90 °. Four sets are arranged.

Further, the first ports 36a and 36b and the second ports 38a and 38b extend parallel to the central axis O from the bearing surface 32a to the outer end surface 30b in the illustrated embodiment. Not limited to this, the first ports 36a and 36b and the second ports 38a and 38b may be extended so as to be inclined with respect to the central axis O.

Within each port set, the first port 36a and the second port 38a arranged in the circumferential direction, and the first port 36b and the second port 38b are the lubricating oil return pipes 64 as the lubricating oil return passages. By 66, they are connected on the outer end surface 30b side.

The sliding member 70 can be made of a low friction resin 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 Turkite and Bearry. .. The sliding member 70 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 70 is performed by fixing the sliding member 70 to the table of the machining center using a vacuum chuck.

Referring to FIG. 6, in a plan view, the sliding member 70 has a sector shape composed of two arcs having a common center and different radii and two lines extending in the radial direction between the two arcs. It is presented. The sliding member 70 includes the two arcs having a sector shape, a land portion 72 extending along two line segments and having a predetermined width, and a lubricating oil pocket 74 surrounded by the land portion 72. The first ports 78a and 78b and the second ports 79a and 79b that open into the lubricating oil pocket 74 are formed. A large number of convex portions 76 are formed in the lubricating oil pocket 74. The number and dimensions of the convex portions 76 are determined so that the total area of the surface of the convex portions 76 in the lubricating oil pocket 74 is preferably 15 to 50% of the area inside the land portion 72.

Referring to FIG. 7, the convex portion 76 has an elongated shape having a major axis Aj and a minor axis An. Both ends of the convex portion 76 along the major axis Aj are formed wider than the central portion. Preferably, the convex portion 76 is recessed in an arc shape having a radius R1 on both side portions crossing the minor axis An. Further, the convex portion 76 bulges in an arc shape having both ends in the major axis Aj direction having a radius R2.

Further, the convex portion 76 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 40 with respect to the sliding member 70. Is formed to do. More specifically, the convex portion 76 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 α of the major axis Aj with respect to the rotation direction DR can be appropriately selected according to the rotation speed of the rotation shaft 40, the angle θ of the bearing surface 22a with respect to the central axis O, and the like.

For example, in the examples of FIGS. 6 and 7, the inclination angle α = 45 ° of the convex portion 76 is set, but α = 60 depending on the rotation speed of the rotating shaft 40, the angle θ of the bearing surface 22a with respect to the central axis O, and the like. The angle of inclination of the convex portion 76 with respect to the rotation direction DR can be changed, such as ° or 30 °. When the rotating shaft 40 rotates at a higher speed or when the angle θ is large, the inclination angle α with respect to the rotation direction DR is made gentle, such as α = 30 °, and the radius is caused by the centrifugal force generated by the flow of the lubricating oil. It is possible to reduce the flow rate of the lubricating oil transported to the outside in the direction.

In this way, by arranging the convex portions 76 so that the inclination angles α and −α alternate with respect to the rotation direction DR of the rotation shaft 40, lubrication in the lubricating oil pocket 74 while the rotation shaft 40 rotates. Due to its viscosity, the oil is dragged by the surface of the rotating shaft 40 and flows in the same direction as the rotating direction DR of the rotating shaft 40, and when it hits the convex portion 76, it is lateral to the sliding member 70, that is, It also flows in the direction of the central axis of the rotating shaft 40.

The first ports 78a and 78b and the second ports 79a and 79b are arranged at both ends of the sliding member 70 so as to be separated from each other in the circumferential direction of the support surface 22a or the rotational direction DR of the rotating shaft 40. It is formed so as to open into the lubricating oil pocket 74 in the thickness direction from the back surface of the moving member 70. Further, the land portion 72 surrounding the lubricating oil pocket 74 is formed at substantially the same height as the convex portion 76 in the lubricating oil pocket 74, and the surfaces of the land portion 72 and the convex portion 76 are the outer periphery of the rotating shaft 40. While in direct contact with the surface, it slides relative to the rotating shaft 40.

In the illustrated embodiment, four sliding members 70 having the same shape and dimensions are attached to the inner peripheral surface of the first base member 20, but the sliding members having different shapes and dimensions depending on the application. A sliding member 70 having a 70 or a convex portion 76 having a different shape and arrangement can be attached.

Further, in the above-described embodiment, four sliding members 70 are attached to the first base member 20, but the present invention is not limited to this, and the number of sliding members is more than or less than four. The member 70 may be attached to the first base member 20. Alternatively, as shown in FIG. 8, one sliding member 80 may be attached. The sliding member 80 has a land 82 similar to the sliding member 70, and a large number of convex portions 86 arranged in the lubricating oil pocket 84 surrounded by the land 82. The sliding member 80 further has first and second ports 78a, 78b; 79a, 79b that penetrate the sliding member 80 in the thickness direction, and the first and second ports 78a, 78b; 79a. , 79b are alternately arranged in the circumferential direction along the sliding member 80. The number and arrangement of the first and second ports 78a, 78b; 79a, 79b are not limited to those shown in FIG. 8, and may depend on the diameter of the rotating shaft 40, the axial dimensions of the sliding member 80, and the like. It can be selected as appropriate.

Next, a method of attaching the sliding members 70 and 80 to the bearing surfaces 22a and 32a of the first and second base members 20 and 30 will be described with reference to FIGS. 9 to 11.
The sliding members 70 and 80 can be attached to the support surface 22a of the first base member 20 by using a jig 100 including a tapered member 110, a washer 102, and a fixing bolt 106 as shown in FIGS. 9 to 11. it can.

Referring to FIG. 10, the washer 102 is a disc-shaped or cylindrical member having a center hole 104 penetrating in the axial direction at the center. The washer 102 has an outer diameter larger than the inner diameter of the shaft holes 24 and 34 of the first and second base members 20 and 30.

Referring to FIG. 11, the tapered member 110 includes a cylindrical portion 112, a conical portion 114 provided on one end surface side of the cylindrical portion 112 and having a conical outer surface 116, and a screw hole 118 having an internal screw. Have. The screw hole 118 extends from the tip surface 112b of the cylindrical portion 112 along the central axis of the tapered member 110. The outer peripheral surface 112a of the cylindrical portion 112 is formed with a predetermined gap so as to fit into the shaft holes 24 and 34 of the first and second base members 20 and 30.

The outer surface 116 is a conical surface having a complementary shape to the bearing surfaces 22a and 32a. A predetermined number of positioning recesses 116a are formed on the outer surface 116. Sliding members 70 and 80 are arranged in the positioning recess 116a. Therefore, when the sliding member 70 is attached to the bearing surfaces 22a and 32a, four sliding members 70 are provided. When the sliding member 80 is attached, one positioning recess 116a is provided.

When the sliding member 70 is attached to the support surface 22a of the first base member 20 or the support surface 32a of the second base member 30, first, the lubricating oil pockets 74 and 84 of the sliding member 70 or 80 are tapered member 110. The sliding member 70 is arranged in the positioning recess 116a so as to face the bottom surface of the positioning recess 116a. At this time, the back surface of the sliding member 70 on the side opposite to the lubricating oil pockets 74 and 84 is exposed from the positioning recess 116a. Adhesive is applied to this back surface.

Next, the outer surface 116 of the tapered member 110 is fitted to the support surface 22a of the first base member 20 or the support surface 32a of the second base member 30. At this time, before the sliding member 70 or 80 arranged in the positioning recess 116a of the tapered member 110 comes into contact with the support surface 22a or 32a, the cylindrical portion 112 is formed into the shaft hole 24 or the shaft hole 24 of the first base member 20. It fits into the shaft hole 34 of the second base member 30, and the tapered member 110 is axially aligned with the first base member 20 or the second base member 30.

At this time, in the taper member 110, the first ports 26a, 26b, 36a, 36b and the second ports 28a, 28b, 38a, 38b are the first ports 78a, 78b and the second of the sliding member 70. It is rotationally positioned with respect to the first base member 20 or the second base member 30 so as to communicate with the ports 79a and 79b, respectively.

After the outer surface 116 of the tapered member 110 is fitted to the support surface 22a of the first base member 20 or the support surface 32a of the second base member 30, the washer 102 is attached to the outer end surface 20b of the first base member 20 or It is arranged so as to abut on the outer end surface 30b of the second base member 30, and the fixing bolt 106 is inserted into the center hole 104 and screwed into the internal screw of the screw hole 118 of the tapered member 110. By tightening the fixing bolt 106, the outer surface 116 of the tapered member 110 is pressed against the bearing surface 22a or 32a, so that the sliding member 70 or 80 located in the positioning recess 116a presses against the bearing surface 22a or 32a. Will be done.

After tightening the fixing bolt 106, the first base member 20 or the second base member 30, the taper member 110, the washer 102, and the fixing bolt 106 are kept until a predetermined time required for the adhesive to cure elapses. It is held in a fixed state. Depending on the adhesive applied to the back surface of the sliding member 70, the fixing bolt 106 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. ..

In the embodiment of FIGS. 1 to 4, the first and second base members 20 and 30 are provided with lubricating oil return pipes 60, 62; 64, 66 to the outside, but the present invention relates to this. The lubricating oil return passage may be provided inside the first and second base members 20, 30 without limitation.

Referring to FIGS. 12 and 13, the first base member 200 is composed of a flat plate-shaped member having a connecting surface 200a separated along the central axis O and an outer end surface 200b. The first base member 200 has a recess 202 formed in a conical shape rotationally symmetric with respect to the central axis O so as to open to the connecting surface 200a, and a shaft hole 204 opening to the outer end surface 20b. A bolt hole 200c on which an internal screw is formed is further formed on the joint surface 200a. The bolt holes 200c are arranged around the central axis O at equal angular intervals.

The first base member 200 further has a first passage 206 that axially penetrates from the recess 202 of the first base member 200 to the outer end surface 200b, and a second passage 208. The first passage 206 communicates with the first crossing groove 216 of the bearing member 220 shown in FIG. 13, which will be described later, and the second passage 208 also communicates with the second crossing groove 218. Four sets of the first passage 206 and the second passage 208 are arranged at a predetermined angle around the central axis O, and 90 ° apart in the illustrated embodiment.

A hollow truncated cone-shaped bearing member 220 is arranged in the recess 202. The bearing member 220 has a conical outer surface and a conical inner surface (not shown), and a sliding member 70 or 80 is attached to the inner surface to form a bearing surface. The support member 220 is formed with first and second ports 210a, 210b; 212a, 212b penetrating from the inner surface to the outer surface.

On the outer surface of the bearing member 220, peripheral grooves 214a and 214b extending in the circumferential direction are formed between the first and second ports 210a and 210b; 212a and 212b. One peripheral groove 214a connects one first port 210a and one second port 212a, and one peripheral groove 214b connects one first port 210b and one second port 212a. Port 212b is connected.

In this example, two pairs of first and second ports 210a, 210b; 212a, 212b connected by peripheral grooves 214a, 214b are arranged so as to be aligned in the axial direction, and the two pairs are formed. The first and second ports 210a, 210b; 212a, 212b are regarded as one port set, and the four port sets 210a, 210b; 212a, 212b are arranged at equal intervals in the circumferential direction of the first base member 20. ..

In each port set, the first ports 210a and 210b are communicatively connected to each other by a first crossing groove 216 extending in the ridgeline direction on the outer peripheral surface of the bearing member 220. That is, in each port set, the first ports 210a and 210b are arranged so as to be aligned in the axial direction so as to open into one first crossing groove 216.

Similarly, in each port set, the second ports 212a and 212b are communicatively connected to each other by a second crossing groove 218 extending in the ridge direction on the outer peripheral surface of the bearing member 220. That is, in each port set, the second ports 212a and 212b are arranged so as to be aligned in the axial direction so as to open into one second crossing groove 218.

By fitting the support member 220 into the recess 202 of the first base member 200 and fixing it with a screw (not shown) or the like, the peripheral grooves 214a and 214b and the surface of the recess 202 are formed in each port assembly. Lubricating oil return passages communicating the paired first and second ports 210a, 210b; 212a, 212b are formed, and the surface of the first cross groove 216 and the recess 202 makes the first in each port set. A first crossing passage connecting the ports 210a and 210b of the first port 210a and 210b is formed, and a second crossing passage communicating the second ports 212a and 212b with each other is formed by the surface of the second crossing groove 218 and the recess 202. It is formed.

The bearing member 220 is fitted to the recess 202 so that the lubricating oil does not leak from the lubricating oil return passage and the first and second cross passages. Further, although not described in detail, the bearing member includes, in addition to the above-mentioned first base member 200, a second base member (not shown) formed in the same manner as the first base member 200. Can be done.

The sliding surfaces of the first and second base members 20, 30, and 200 to which the sliding members 70 and 80 are attached are finished by cutting or grinding. Then, the first and second base members 20, 30, and 200 are arranged facing each other with the truncated cone portions 42 and 44 of the rotating shaft 40 interposed therebetween, and the distance between the first and second base members is measured. The spacer 50 is thickened slightly thicker than the measurement result, the bolt 54 is temporarily tightened, the lubricating oil supply device 320 is piped, and the sliding circular motion guide device is assembled. Lubricating oil of a predetermined pressure is supplied from the lubricating oil supply device 320 to the sliding surface, and the rotating shaft 40 is rotated to measure the rotational torque. The sliding circular motion guide device 10 is completed by adjusting the thickness of the spacer 50 so that the rotational torque becomes an allowable value.

In the sliding circular motion guide device 10 of the present invention, the rotation axis has only the first truncated cone portion 42 or 44, and the corresponding base member is only the first base member 20 or the second base member 30. It can support radial loads and unidirectional thrust loads. Further, the shaft may be fixed and the base member may rotate. In that case, the sliding member is attached to the shaft that does not rotate.

A slide bearing system using the slide circular motion guide device 10 according to the above-described embodiment will be described with reference to FIGS. 14 and 15. In FIGS. 14 and 15, the plain bearing system 300 includes a rotary shaft 310 and a plain bearing 302 that supports the rotary shaft 310. The sliding member 70 shown in FIG. 6 is attached to the support surface 302a of the slide bearing 302. The sliding member 80 of FIG. 8 may be used instead of the sliding member 70.

Referring to FIGS. 14 and 15, the rotating shaft 310 is formed by the rotating shaft 40 in the above-described embodiment, and the slide bearing 302 is the first base member 200 shown in FIGS. 12 and 13 and the corresponding second base. It is formed by a member and a spacer 50.

The slide bearing 302 communicates with the lubricating oil return passage 304 (corresponding to 214a and 214b in FIG. 13) and the first ports 78a and 78b (corresponding to 210a and 210b in FIG. 13) of the sliding member 70. A second passage 308 (corresponding to 208 in FIG. 12) communicating with the passage 306 (corresponding to 206 in FIG. 12) and the second ports 79a and 79b (corresponding to 212a and 212b in FIG. 13) of the sliding member 70. And have.

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 70 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, for example, as a part of a machine control device (not shown) of a machine to which the slide bearing system 300 is applied, for example, 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 temperature of the lubricating oil stored in the receiving side tank 326a is adjusted by the lubricating oil temperature control device 328 and stored in the supply side tank 326b, and the lubricating oil is supplied from the supply side tank 326b to the slide bearing 302 by the pump 330. Can be supplied.

The direction in which the rotating shaft 310 is directed from the first ports 78a and 78b of the sliding member 70 to the second ports 79a and 79b relative to the sliding bearing 302 as shown by the arrow DR1 in FIG. 14 (FIG. When 14 rotates in the counterclockwise direction), the lubricating oil in the lubricating oil pocket 74 is dragged by the viscosity of the lubricating oil to the outer surface of the rotating shaft 310 and becomes a sliding member 70 as shown by the arrow L1. On the other hand, it moves relatively to the second ports 79a and 79b. As a result, in the lubricating oil pocket 74, the second ports 79a and 79b, which are on the front side in the rotation direction of the rotating shaft 310, have a relatively high pressure, and the first ports 78a and 78b have a 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 is entered into the lubricating oil pocket 74 from the first ports 78a and 78b. It flows in and the rest circulates in the lubricating oil return passage 304 toward the second passage 308.

The lubricating oil that has flowed into the lubricating oil pocket 74 flows through the lubricating oil pocket 74 toward the second ports 79a and 79b, and is discharged from the second ports 79a and 79b to the second passage 308 and the lubricating oil. It is collected to the lubricating oil supply device 320 via the pipeline 324. When the lubricating oil flows through the lubricating oil pocket 74, the lubricating oil whose temperature has risen due to the sliding in the lubricating oil pocket 74 is replaced by the low-temperature lubricating oil newly supplied from the first ports 78a and 78b. It is discharged from the lubricating oil pocket 74 through the second ports 79a and 79b. The sliding member 70 and the rotating shaft 310 are cooled by the replacement action of the lubricating oil.

The direction in which the slide bearing 302 is directed from the second ports 79a, 79b of the sliding member 70 to the first ports 78a, 78b relative to the slide bearing 302, as shown by the arrow DR2 in FIG. 15 (FIG. 15). Then, when rotating in the clockwise direction), the lubricating oil in the lubricating oil pocket 74 is dragged to the outer surface of the rotating shaft 310 due to its viscosity, as shown by the arrow L2, with respect to the sliding member 70. It moves relatively to the first ports 78a and 78b. As a result, in the lubricating oil pocket 74, the first ports 78a and 78b, which are on the front side in the rotation direction of the rotating shaft 310, have a relatively high pressure, and the second ports 79a and 79b have a low pressure. The lubricating oil whose temperature has risen due to sliding in the lubricating oil pocket 74 flows out from the first ports 78a and 78b toward the first passage 306 and merges with the low-temperature lubricating oil from the first passage 306. The temperature drops somewhat and 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 74 from the second ports 79a and 79b, and the remaining part passes through the second passage 308 and the lubricating oil discharge pipe 324. It is recovered to the lubricating oil supply device 320 via.

When the lubricating oil flows through the lubricating oil pocket 74, the temperature-increased lubricating oil previously existing in the lubricating oil pocket 74 has a somewhat temperature newly supplied from the second ports 79a and 79b. The reduced lubricating oil is discharged from the lubricating oil pocket 74 through the first ports 78a and 78b. The sliding member 70 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 70 and the outer surface of the rotating shaft 310 can be directly cooled, and the heat generating region of the outer surface of the sliding member 70 and the rotating shaft 310 can be directly cooled. Become. Further, since the lubricating oil is supplied to the lubricating oil pocket 74 surrounded by the land portion 18 formed on the sliding member 70, the amount of lubricating oil leaking from between the sliding member 70 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 74, the load capacity of the sliding circular motion guide device can be increased or decreased.

Other embodiments of the plain bearing system using the sliding circular motion guide device of the present invention will be described with reference to FIGS. 16 and 17.
In FIGS. 16 and 17, the plain bearing system 500 includes a rotary shaft 504 and a plain bearing 502 that supports the rotary shaft 504. The sliding member 70 shown in FIG. 6 is attached to the support surface 502a of the slide bearing 502. The sliding member 80 of FIG. 8 may be used instead of the sliding member 70. The rotary shaft 504 is formed by the rotary shaft 40 in the above-described embodiment, and the slide bearing 502 is formed by the first base member 200 and the corresponding second base member and spacer 40 shown in FIGS. ..

The slide bearing 502 has a first passage 506 communicating with the first ports 78a and 78b of the sliding member 70, and a second passage 508 communicating with the second ports 79a and 79b of the sliding member 70. doing. The first passage 506 is the first port 210a, 210b and the first passage 206 of the bearing member 220 fixed to the first base member 200 and the first port and the first of the corresponding second base member. Formed by the passage of. The second passage 508 is the second port 212a, 212b and the second passage 208 of the bearing member 220 fixed to the first base member 200 and the second port and the second of the corresponding second base member. Formed by the passage of. In this embodiment, the lubricating oil return passage is not provided. That is, the peripheral grooves 214a and 214b are not formed in the bearing member 220.

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. 14 and 15.

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. 14 and 15, or a machine to which the sliding bearing system 500 is applied, for example, a machine tool machine. It can be configured as part of a control device (not shown) or part of an NC device. The switching valve 518 moves from the first position shown in FIG. 16 to the second position shown in FIG. 17 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 74 according to, for example, the load torque of the spindle motor (not shown) of a machine to which the slide 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 74 (the pressure on the upstream side of the lubricating oil discharge pipe 516) becomes a predetermined value.

In FIG. 16, the rotation shaft 504 is in the direction from the first ports 78a and 78b of the sliding member 70 toward the second ports 79a and 79b (counterclockwise direction in FIG. 16) as shown by the arrow DR1. When rotating, the lubricating oil in the lubricating oil pocket 74 is dragged by the outer surface of the rotating shaft 504 due to its viscosity, as shown by the arrow L1, and is a second port relative to the sliding member 70. It moves to the 79a and 79b sides. 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 74 is discharged to the lubricating oil supply device via the second ports 79a and 79b, the second pipeline 512, the switching valve 518, and the lubricating oil discharge pipeline 516. At the same time, new low-temperature lubricating oil is introduced from the lubricating oil supply device into the lubricating oil pocket 74 via the lubricating oil supply pipeline 514, the switching valve 518, the first pipeline 510, and the first ports 78a and 78b. Will be supplied. As a result, the sliding member 70 and the rotating shaft 504 are cooled.

In FIG. 17, the rotation shaft 504 rotates in the direction from the second ports 79a and 79b of the sliding member 70 toward the first ports 78a and 78b (clockwise in FIG. 17) as shown by the arrow DR2. At that time, the lubricating oil in the lubricating oil pocket 74 is dragged by the outer surface of the rotating shaft 504 due to its viscosity, as shown by the arrow L2, and is relatively the first port 18b with respect to the sliding member 70. Move to the side. 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 74 is discharged to the lubricating oil supply device via the first ports 78a and 78b, the first pipeline 510, the switching valve 518, and the lubricating oil discharge pipeline 516. At the same time, new low-temperature lubricating oil is introduced from the lubricating oil supply device into the lubricating oil pocket 74 via the lubricating oil supply line 514, the switching valve 518, the second line line 512, and the second ports 79a and 79b. It is supplied, which cools the sliding member 70 and the rotating shaft 504.

In the embodiments of FIGS. 14 and 15, when the rotating shaft 310 rotates toward the second ports 79a and 79b, more lubricating oil supply device 320 than when moving toward the first ports 78a and 78b in the opposite direction. Lubricating oil from the above will be supplied to the sliding member 70, resulting in non-uniformity of the lubricating oil supply temperature with respect to the moving direction of the rotating shaft 310.

On the other hand, in the embodiment of FIGS. 16 and 17, the switching valve 518 connects the first ports 78a and 78b and the second ports 79a and 79b of the sliding member 70 to the lubricating oil supply line 514. It is designed to switch between the lubricating oil discharge pipe and the lubricating oil discharge pipe 516. As a result, the total amount of the heated lubricating oil in the lubricating oil pocket 74 is discharged from the port of the first ports 78a and 78b and the second ports 79a and 79b that is on the front side in the rotation direction of the rotating shaft 350. Since the entire amount of the newly supplied low-temperature lubricating oil is supplied from the rear port, the temperature and supply amount of the lubricating oil do not change depending on the moving direction of the rotating shaft 504.

A rotary work head using the sliding circular motion guide device of the present invention will be described with reference to FIG.
In FIG. 18, the rotary work head 600 is a device that rotatably attaches a work W to be placed, fixed, and machined on a table 622 of a machine tool. The rotary work head 600 has a hollow cylindrical spindle housing 612 fixed to the table 622 and a rotary spindle 606 rotatably supported by the spindle housing 612. 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 spacer 614 is sandwiched between the front end plate 604 and the spindle housing 612.

The rotary spindle 606 is supported on the front side by the circular motion guide device of the present invention, particularly the slide bearing system 500 shown in FIG. 16, on the spindle housing 612. The rotary spindle 606 has a head portion 616 corresponding to the truncated cone portions 42 and 44 of the rotary shaft 40 of the sliding circular motion guide device 10 of FIGS. 1 to 4. The head portion 616 has two truncated cone portions whose radii gradually decrease from the maximum outer diameter portion facing the spacer 614 toward both the tip direction (right direction in FIG. 18) and the rear end direction (left direction in FIG. 18). It has 616a and 616b.

The spindle housing 612 has a conical bearing surface 612a that supports the truncated cone portion 616a, and the front end plate 604 has a conical bearing surface 604a that supports the truncated cone portion 616b. That is, the spindle housing 612 and the front end plate 604 form a bearing member. Since the two truncated cone portions 616a and 616b of the rotating spindle 606 are supported so as to be sandwiched in the axial direction by the two bearing surfaces 612a and 604a, not only the radial load acting on the rotating spindle 606 but also the central axis is supported. Thrust loads acting in both anterior and posterior directions along O are also supported.

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.

The rotary spindle 606 projects outward through the central opening 602a of the rear end plate 602. A suitable radial bearing 620, such as a ball bearing (not shown), can be fitted into the central opening 602a to rotatably support the rear end portion of the rotary spindle 606.

The spindle housing 612 is formed with first passages 624a and 624b and second passages 626a and 626b communicating with the first ports 78a and 78b and the second ports 79a and 79b of the sliding member 70 in the radial direction. ing.

Next, a rotary work head according to another embodiment will be described with reference to FIG.
In FIG. 19, the rotary work head 700 includes a hollow cylindrical spindle housing 712 fixed to the table 724 and a rotary spindle 706 rotatably supported by the spindle housing 712, similarly to the rotary work head 600 of FIG. have. In the spindle housing 712, the opening on the rear end side is closed by the rear end plate 702, and the opening on the front end side is closed by the front end plate 704. A spacer 714 is sandwiched between the front end plate 704 and the spindle housing 712.

The tip side of the rotary spindle 706 is supported by the spindle housing by the circular motion guide device of the present invention, particularly the slide bearing system 500 shown in FIG. The rotary spindle 706 has a head portion 716. The head portion 716 has a truncated cone portion 716a whose radius gradually decreases in both the rear end direction (left direction in FIG. 19) from the maximum outer diameter portion facing the spacer 714. In the present embodiment, the rotating spindle 706 is different from the rotating spindle 706 in FIG. 18, and the head portion 716 has a radius gradually increasing from the maximum outer diameter portion facing the spacer 714 toward the tip end direction (to the right in FIG. 19). It does not have a truncated cone portion to be reduced, and is an annular plane 718 perpendicular to the central axis O.

The spindle housing 712 has a conical bearing surface 712a that supports the truncated cone portion 716a. That is, the spindle housing 712 forms a bearing member. In this embodiment, the front end plate 704 may be provided with a thrust bearing (not shown) in place of the bearing surface 604a of FIG. The truncated cone portion 716a of the rotating spindle 706 is supported by the bearing surface 712a from the rear end side in the axial direction, and is supported by the thrust bearing from the tip side (right side in FIG. 19).

A face plate 720 is fixed to the tip of the rotary spindle 706, and the work W is attached to the face plate 720. A rotor 708 is fixed to the outer peripheral surface on the rear end side of the rotating spindle 706. A stator 710 is fixed to the inner peripheral surface of the spindle housing 712 so as to face the rotor 708. The rotor 708 and the stator 710 form a built-in motor for the rotary workhead 700.

In the spindle housing 712, the opening on the rear end side is closed by the rear end plate 702, and the opening on the front end side is closed by the front end plate 704. A spacer 714 is sandwiched between the front end plate 704 and the spindle housing 712. The rotary spindle 706 has a head portion 716 corresponding to the truncated cone portion 42 of the rotary shaft 40.

The rotary spindle 706 projects outward through the central opening 702a of the rear end plate 702. A suitable bearing 722, such as a ball bearing (not shown), can be fitted into the central opening 702a to rotatably support the rear end portion of the rotary spindle 706.

The spindle housing 712 is formed with first passages 724a and 724b and second passages 726a and 726b communicating with the first ports 78a and 78b and the second ports 79a and 79b of the sliding member 70 in the radial direction. ing.

10 Circular motion guide device 18 Land part 20 First base member 30 Second base member 40 Rotating shaft 42 First truncated cone part 44 Second truncated cone part 50 Spacer 54 Fixing bolt 70 Sliding member 72 Land part 74 Lubricating oil pocket 76 Convex part 78a First port 78b First port 79a Second port 79b Second port

In order to achieve the above object, according to the present invention, in a sliding circular motion guide device attached between a support and a moving body that make a relative circular motion around a common central axis, along the central axis. A shaft body including at least one conical base portion having an inclined outer peripheral surface whose diameter gradually decreases from the maximum outer diameter, a bearing member having an inclined inner peripheral surface facing the inclined outer peripheral surface of the shaft body, and the shaft body. A sliding member which is attached to the inclined outer peripheral surface of the bearing member or the inclined inner peripheral surface of the bearing member and constitutes a sliding surface when the shaft body and the bearing member make a relative circular motion around the central axis. The sliding member is made of a low-friction resin member, and has a lubricating oil pocket formed of a recess surrounded by a land portion and a plurality of convex portions formed in the lubricating oil pocket. In the lubricating oil pocket of the sliding member, the parts on the front side and the rear side with respect to the circular motion direction of the shaft body or the bearing member are opened in the lubricating oil pocket, and gather in the lubricating oil pocket on the rear side in the circular motion direction. Provided is a sliding circular motion guide device including a lubricating oil return passage for returning the lubricating oil to the front side in the circular motion direction in the lubricating oil pocket.

Claims (10)

In a circular motion guide device attached between a support and a moving body that relatively circularly move around a common central axis.
A shaft body comprising at least one truncated cone portion having an inclined outer surface whose diameter gradually decreases from the maximum outer diameter along the central axis.
A bearing member having an inclined inner peripheral surface facing the inclined outer peripheral surface of the shaft body,
A sliding circular motion guide device characterized by being equipped with. Sliding that is attached to the inclined outer peripheral surface of the shaft body or the inclined inner peripheral surface of the bearing member and constitutes a sliding surface when the shaft body and the bearing member make a relative circular motion around the central axis. The circular motion guide device according to claim 1, further comprising a member. The shaft body has first and second inclined outer peripheral surfaces whose diameter gradually decreases from the maximum outer diameter in the opposite direction along the central axis, and the bearing member has the first and second inclined surfaces. It has first and second bearing members that form first and second inclined inner peripheral surfaces that are complementary to each of the outer peripheral surfaces, and the first and second inclined outer peripheral surfaces are the central axis. The sliding circular motion guide device according to claim 2, further comprising a fastening member for fastening the first and second bearing members to each other so as to be sandwiched in the direction. The sliding member is made of a low-friction resin member, and has a lubricating oil pocket formed of a recess surrounded by a land portion and a plurality of convex portions formed in the lubricating oil pocket. In the lubricating oil pocket of the sliding member, the parts on the front side and the rear side with respect to the circular movement direction of the shaft body or the bearing member are opened in the lubricating oil pocket, and gather in the lubricating oil pocket on the rear side in the circular movement direction. The sliding circular movement guide device according to claim 2, further comprising a lubricating oil return passage for returning the lubricating oil to the front side in the circular movement direction in the lubricating oil pocket. The sliding circle motion guide device according to claim 4, further comprising a lubricating oil supply pipeline for supplying lubricating oil to the lubricating oil return passage and a lubricating oil discharge pipeline for recovering lubricating oil from the lubricating oil return passage. .. A plurality of lubricating oil pockets are formed along the sliding surface, and lubricating oil return passages are opened in each of the lubricating oil pockets on the front side and the rear side in the circular motion direction of the shaft body or the bearing member. The sliding circular motion guide device according to claim 4. The sliding member has a thin plate-like sector shape, and after forming a lubricating oil pocket and a plurality of convex portions in the lubricating oil pocket on one surface, the inside of the inclination of the first and second bearing members The circular motion guide device according to claim 3, which is attached to the peripheral surface. The circular motion guide device according to claim 3, wherein the first and second bearing members are fastened with a spacer sandwiched between them. In the method of attaching the sliding member to the sliding circular motion guide device according to any one of claims 2 to 8.
Prepare a thin plate-shaped sliding member,
A tapered member having a conical portion that gradually expands along the central axis and having a positioning recess for receiving and positioning the sliding member on the outer surface of the conical portion is prepared.
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 tapered member is arranged with respect to the bearing member so that the outer surface of the conical portion faces the inner peripheral surface of the bearing member.
The sliding member is pressed against the inner peripheral surface of the bearing member by pushing the tapered member into the bearing member while facing the outer surface of the tapered member with the inner peripheral surface of the bearing member. Method. 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
A rotary spindle rotatably supported by the spindle housing by the sliding circular motion guide device according to any one of claims 1 to 8.
A spindle motor, which is arranged in the spindle housing and drives the rotary spindle to rotate,
A rotary work head characterized by being equipped with.

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