JP2010276141A - Linear bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear bearing capable of supporting a shaft body stably and precisely. <P>SOLUTION: The linear bearing includes a bearing outer cylinder 14 consisting of a cylinder body 11 of a resin material in which linear spherical body holding holes 12 having a slit-like opening 12a holding a spherical body in a manner capable of poking to inside of an inner circumferential face of the cylinder body and linear spherical body passages 13 positioned between an inner circumferential face and an outer circumferential face of the cylinder body are alternately arranged in a circumferential direction of the cylinder body; an annular cover material provided with a plurality of spherical body turning grooves forming a spherical body circulating route by connecting a holding hole and its adjacent passage of the spherical body holding holes and the spherical body passage arranged for respective both end surfaces of the bearing outer cylinder are regarded as a set and connected with respective end parts of the holding hole and passage of each set; and a plurality of spherical bodies 18, 18, and so on arranged in respective spherical body circulation routes. In the linear bearing, linear grooves 14a extending between respective adjacent spherical holding hole 12 and spherical body passage 13 in the outer circumferential face of the bearing outer cylinder 14 in a longitudinal direction of the outer cylinder are formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a linear bearing that slidably supports a shaft body included in various mechanical devices.

  Conventionally, in order to support shafts of various mechanical devices (eg, drive shafts of linear motion drive devices) so that they can slide in a linear direction, a cylindrical body and a cylindrical sphere held in the cylindrical body are supported. Linear motion bearings having a cage and a plurality of spheres held by the cage are widely used. Usually, the said cylinder and a sphere are formed from a metal material, and a cylindrical sphere holder is formed from a resin material.

  In order to realize weight reduction or simple manufacture of the linear motion bearing, studies have been made to integrally mold the cylindrical body and the cylindrical spherical cage using a resin material.

  In Patent Document 1, a linear sphere having a slit-like opening made of a resin material cylinder and holding the sphere in a circumferential direction of the cylinder so as to protrude inside the inner peripheral surface of the cylinder. Holding holes (straight grooves constituting the load region) and linear spherical passages (straight grooves constituting the no-load region) positioned between the inner peripheral surface and the outer peripheral surface of the cylinder are alternately arranged. The bearing outer cylinder (bearing main body) and the both ends of the bearing outer cylinder, which are attached to each of the both ends of the bearing outer cylinder and the spherical passage, are adjacent to each other as a set. An annular lid member (end cap) having a plurality of spherical turning grooves connected to each end of the holding hole and the passage to form a spherical circulation path (infinite circulation groove), and a plurality of arranged in each spherical circulation path A linear motion bearing (linear ball bearing) comprising a spherical body (bearing ball) is disclosed. That.

  The shaft body to be supported is accommodated in the bearing outer cylinder, and is supported by a plurality of spheres protruding inside the inner peripheral surface of the bearing outer cylinder.

JP-A-9-133131 (Claim 3, FIG. 1)

  In the linear motion bearing of Patent Document 1, the weight reduction and simple manufacture are realized by integrally forming the bearing outer cylinder using a resin material.

  However, when the inventors of the present application proceed with the study, the linear motion bearing becomes unstable when the shaft body to be supported is repeatedly moved at a high speed, for example, as described below. It turned out to be easy.

  As described above, when the shaft body is repeatedly moved at high speed in the linear motion bearing, heat is generated at the contact position between the shaft body and the sphere, and the heat is transmitted to the bearing outer cylinder.

  Since the bearing outer cylinder of this linear motion bearing is formed from a resin material, it has a lower thermal conductivity than the case where a cylinder formed from a metal material as described above is used. For this reason, it is difficult for the heat transmitted to the bearing outer cylinder to be quickly transmitted to the air around the bearing outer cylinder as described above. Moreover, the bearing outer cylinder has a configuration in which the cylindrical body and the cylindrical cage are integrated, and its volume is large. For this reason, the heat transmitted to the bearing outer cylinder as described above is easily accumulated in the bearing outer cylinder. For these reasons, the temperature of the bearing outer cylinder of the linear motion bearing of Patent Document 1 is likely to rise.

  When the temperature of the bearing outer cylinder rises, the bearing outer cylinder thermally expands, and a slight gap is formed between the sphere held by the bearing outer cylinder and the shaft body, and between the sphere and the inner wall surface of the sphere holding hole. Produce. For this reason, in the linear motion bearing of Patent Document 1, when the shaft body is repeatedly moved at a high speed as described above, the support of the shaft body is likely to be unstable. The same problem also occurs when, for example, the heat generated when the drive device is operated is transmitted to the shaft body connected to the drive device and the bearing outer cylinder via the sphere.

  An object of the present invention is to provide a linear motion bearing capable of realizing stable and precise support of a shaft body.

  The present invention consists of a cylindrical body made of a resin material, and in the circumferential direction of the cylindrical body, a linear spherical body holding hole having a slit-like opening that holds the spherical body so as to protrude inside the inner peripheral surface of the cylindrical body; A bearing outer cylinder in which linear spherical passages positioned between the inner peripheral surface and the outer peripheral surface of the cylindrical body are alternately arranged; the spherical body attached to each of both end faces of the bearing outer cylinder Of the holding holes and the spherical passages, the holding holes and the passages adjacent to each other as a set are connected to the respective ends of the holding holes and the passages so as to form a circular circulatory groove that forms a spherical circulation path. A linear motion bearing composed of a plurality of spheres arranged in each sphere circulation path, at a position between the sphere holding hole and the sphere passage adjacent to each other on the outer peripheral surface of the bearing outer cylinder. The linear motion bearing is characterized in that a linear groove extending in the length direction of the outer cylinder is formed.

Preferred embodiments of the linear motion bearing of the present invention are as follows.
(1) The number of linear grooves is equal to the sum of the number of spherical holding holes and the number of spherical passages.
(2) A peripheral wall that fits to the outer peripheral surface of the lid member is formed on the outer peripheral edge portion of each end surface of the bearing outer cylinder, and a protrusion extending in the length direction of the outer cylinder on the inner peripheral surface of the peripheral wall or A groove is provided, and a groove or protrusion corresponding to the protrusion or groove on the peripheral wall is provided on the outer peripheral surface of the lid member. More preferably, a hole penetrating in the thickness direction is formed in the peripheral wall of the bearing outer cylinder, and a protrusion engaging with the hole is formed on the outer peripheral surface of the lid member.
(3) A slit that opens at least a part of the spherical passage in the length direction is formed on the inner peripheral surface of the bearing outer cylinder.

  The present invention also provides a linear motion guide device in which a shaft body is accommodated in a bearing outer cylinder of the linear motion bearing according to the present invention in a state where an outer peripheral surface of the shaft body is in contact with a sphere protruding inside the inner peripheral surface of the outer cylinder. There is also.

  In the linear motion guide device of the present invention, a plurality of grooves extending in the length direction are formed on the outer peripheral surface of the shaft body, and each spherical body protruding inside the inner peripheral surface of the bearing outer cylinder is each groove of the shaft body. Is preferably engaged.

  In the linear motion bearing of the present invention, the temperature rise of the bearing outer cylinder is effectively suppressed by heat radiation from the linear groove formed on the outer peripheral surface thereof. For this reason, the linear motion bearing of the present invention can realize stable and precise support of the shaft body to be supported because thermal expansion of the bearing outer cylinder during use is suppressed.

It is a front view which shows the structural example of the linear motion bearing of this invention. The linear motion bearing 10 and the shaft body 19 constitute the linear motion guide device of the present invention. It is a right view of the linear motion bearing 10 of FIG. It is sectional drawing of the linear motion bearing 10 cut | disconnected along the cutting line III-III line entered in FIG. It is sectional drawing of the linear motion bearing 10 cut | disconnected along the cutting line IV-IV line entered in FIG. It is sectional drawing of the bearing outer cylinder 14 cut | disconnected along the cutting line VV entered in FIG. It is a right view of the bearing outer cylinder 14 of FIG. It is a left view of the bearing outer cylinder 14 of FIG. FIG. 5 is a left side view of the right lid member 17 shown in FIG. 4. It is sectional drawing of the cover material 17 cut | disconnected along the cutting line IX-IX line entered in FIG. FIG. 5 is a right side view of the left lid member 17 shown in FIG. 4. It is sectional drawing which shows another structural example of a bearing outer cylinder. It is sectional drawing which shows another structural example of a bearing outer cylinder. It is sectional drawing which shows another structural example of the linear motion guide apparatus of this invention.

  A linear motion bearing according to the present invention will be described with reference to the accompanying drawings.

  1-4 is a figure which shows the structural example of the linear motion bearing of this invention.

  FIG. 1 is a front view showing a configuration example of a linear motion bearing of the present invention. FIG. 2 is a right side view of the linear motion bearing 10 of FIG. FIG. 3 is a cross-sectional view of the linear motion bearing 10 cut along the cutting line III-III entered in FIG. 4 is a cross-sectional view of the linear motion bearing 10 cut along the cutting line IV-IV entered in FIG.

  5-7 is a figure which shows the structure of the bearing outer cylinder 14 with which the linear motion bearing 10 of FIG. 1 is provided.

  FIG. 5 is a cross-sectional view of the bearing outer cylinder 14 cut along the cutting line VV entered in FIG. 3. FIG. 6 is a right side view of the bearing outer cylinder 14 of FIG. FIG. 7 is a left side view of the bearing outer cylinder 14 of FIG.

  8-10 is a figure which shows the structure of the cyclic | annular cover material 17 with which the linear motion bearing 10 of FIG. 1 is provided.

  FIG. 8 is a left side view of the right lid member 17 shown in FIG. FIG. 9 is a cross-sectional view of the lid member 17 cut along the cutting line IX-IX written in FIG. FIG. 10 is a right side view of the left lid member 17 shown in FIG.

  A linear motion bearing 10 according to the present invention includes a cylindrical body 11 made of a resin material, and in the circumferential direction of the cylindrical body 11, a slit-shaped opening 12 a that holds a spherical body so as to protrude inside the inner peripheral surface of the cylindrical body 11. Bearing outer cylinder 14 formed by alternately arranging linear spherical holding holes 12 having linear spheres and linear spherical passages 13 positioned between the inner peripheral surface and the outer peripheral surface of the cylindrical body 11; 14, each of the holding holes 12 and the passages 13 adjacent to each other out of the spherical body holding holes 12 and the spherical passages 13. An annular lid member 17 having a plurality of sphere turning grooves 16 connected to the ends to form a sphere circulation path 15; and a plurality of spheres 18, 18,... Arranged in each sphere circulation path 15. Yes.

  In the linear bearing 10, a linear groove 14 a extending in the length direction of the outer cylinder 14 is formed on the outer peripheral surface of the bearing outer cylinder 14 at a position between the spherical holding holes 12 and the spherical passage 13 adjacent to each other. The main feature is that

  By adopting such a configuration, for example, heat generated at the contact position between the shaft body 19 and the sphere 18 due to repeated movement of the shaft body 19 to be supported at a high speed causes the bearing 18 to pass through the sphere 18. When the heat is transferred to the outer cylinder 14, the heat of the bearing outer cylinder 14 passes through the outer peripheral surface of the bearing outer cylinder 14 and the inner surface of the linear groove 14 a formed on the outer peripheral surface of the bearing outer cylinder 14. Prompt transmission to the surrounding air. In addition, since the thickness (and hence the volume) of the portion where the linear groove 14a of the bearing outer cylinder 14 is formed becomes small, heat storage at the portion is suppressed. For these reasons, the temperature rise of the bearing outer cylinder 14 is suppressed, and therefore, the thermal expansion of the bearing outer cylinder 14 is suppressed. For this reason, the linear motion bearing 10 of the present invention supports the shaft body 19 to be supported stably and accurately via the plurality of spheres 18, 18, protruding inside the inner peripheral surface of the bearing outer cylinder 14. can do.

  The linear groove 14 a of the bearing outer cylinder 14 is formed at a position between the sphere holding hole 12 and the sphere passage 13 that are adjacent to each other.

  A large load may be applied from the sphere 18 to the sphere holding hole 12 and the sphere passage 13 of the bearing outer cylinder 14, particularly to the inner wall surface of the sphere holding hole 12. For this reason, if the straight groove is formed in a portion of the bearing outer cylinder 14 where the spherical body holding hole 12 or the spherical passage 13 is formed, the mechanical strength of the bearing outer cylinder 14 is reduced at the portion. In the linear motion bearing 10 of the present invention, a decrease in the mechanical strength of the bearing outer cylinder 14 is not a problem, that is, between the spherical holding holes 12 and the spherical passage 13 adjacent to each other in the bearing outer cylinder 14. A straight groove 14a is formed at the site. As a result, the temperature rise of the bearing outer cylinder 14 is suppressed without causing a decrease in mechanical strength, which is a practical problem, in the bearing outer cylinder 14.

  The number of straight grooves 14 a is preferably equal to the sum of the number of spherical holding holes 12 and the number of spherical passages 13. Thereby, since the linear groove 14a is arrange | positioned in each between the spherical body holding | maintenance hole 12 and the spherical path 13 which mutually adjoin, the temperature rise of the bearing outer cylinder 14 can be suppressed effectively.

  The length of the linear groove 14a is preferably in the range of 0.5 to 1.5 times (particularly 0.8 to 1.2 times) the length of the sphere holding hole 12. By making the length of the straight groove 14 a substantially equal to the length of the spherical body holding hole 12, the temperature rise of the bearing outer cylinder 14 can be further effectively suppressed.

  By adjusting the depth of the linear groove 14a, the thickness (minimum value) of the portion of the bearing outer cylinder 14 where the linear groove 14a is formed is equal to 0 of the thickness (minimum value) of the portion where the spherical body holding hole 12 is formed. It is preferable to set the value within the range of 5 to 1.5 times (particularly 0.7 to 1.3 times). Thereby, the fall of the mechanical strength of the site | part in which the linear groove | channel 14a of the bearing outer cylinder 14 was formed is suppressed. Further, uniform heat storage and heat dissipation in the circumferential direction of the bearing outer cylinder 14 are realized. Accordingly, since the bearing outer cylinder 14 is prevented from being deformed unevenly in the circumferential direction due to partial thermal expansion of the bearing outer cylinder 14, a more stable and precise support of the shaft body 19 to be supported is achieved. Realized.

  Hereinafter, the configuration of the linear motion bearing 10 of the present invention will be described in detail.

  The cylinder 11 constituting the bearing outer cylinder 14 is formed from a known resin material. Typical resin materials include polyacetal resins, polyamide resins, polyphenylene sulfide (PPS) resins, thermoplastic resin materials typified by polyether ether ketone (PEEK) resins, and thermosetting typified by phenol resins. The resin material is mentioned.

  The bearing outer cylinder 14 has a linear sphere holding hole 12 having a slit-like opening 12a that holds the sphere 18 so as to protrude inside the inner peripheral surface of the cylinder 11 in the circumferential direction of the cylinder 11. A linear spherical passage 13 positioned between the inner peripheral surface and the outer peripheral surface of the cylindrical body 11 is alternately arranged.

  The bearing outer cylinder 14 can be easily manufactured using, for example, a resin molding method typified by a compression molding method or an injection molding method, a machining method typified by cutting or grinding, or a method in which both are combined. it can. In particular, when a resin molding method is used, the production of the bearing outer cylinder 14 becomes extremely easy.

  As shown in FIG. 3, the bearing outer cylinder 14 is provided with a total of four sets 21 of the sphere holding hole 12 and the sphere passage 13.

  As shown in FIG. 4, an annular lid member 17 is attached to each of both end surfaces of the bearing outer cylinder 14. As shown in FIGS. 8 to 10, each lid member 17 is provided with four spherical turning grooves 16, 16, 16, 16.

  The lid member 17 can be formed from a resin material in the same manner as the bearing outer cylinder 14. The lid member 17 can also be formed from a metal material typified by steel or a ceramic material.

  Each spherical turning groove 16 of the lid member 17 is connected to each end of the holding hole 12 and the passage 13 of each set 21 with the spherical holding hole 12 and the spherical passage 13 adjacent to each other shown in FIG. Yes. A sphere circulation path (FIG. 4: 15) is formed by the sphere holding hole 12 and the sphere passage 13 of each set 21 and the sphere turning grooves 16 and 16 at both ends thereof.

  The number of the spherical circulation paths 15 is preferably in the range of 2 to 10. When the number of the spherical circulation paths 15 is 10 or less, the bearing outer cylinder 14 can be easily manufactured. Further, since the number of holes (the sphere holding hole 12 and the sphere passage 13) formed in the bearing outer cylinder 14 is reduced, the mechanical strength of the bearing outer cylinder 14 is increased. In order to stably support the shaft body 19 by the surfaces of the plurality of spheres 18, 18,... Protruding inside the inner peripheral surface of the bearing outer cylinder 14, the number of the sphere circulation paths 15 is within a range of 3 to 10. More preferably it is.

  As shown in FIG. 4, a plurality of spheres 18, 18,. In FIG. 4, only five of the plurality of spheres are shown for easy understanding of the configuration of the linear motion bearing 10.

  The number of the spheres 18 accommodated in the sphere holding holes 12 of the sphere circulation paths 15 and supporting the shaft body 19 is preferably in the range of 2 to 30 (particularly 3 to 20).

  The sphere 18 is made of a metal material typified by steel, a ceramic material, or a resin material.

  By using a bearing outer cylinder formed of a resin material as described above, a lid formed of, for example, a resin material, and a sphere formed of a ceramic material, a linear motion bearing having excellent corrosion resistance is obtained. Can be configured. Such a linear motion bearing is particularly suitable for use in water or in a high humidity environment.

  As shown in FIGS. 2 and 4 to 7, a peripheral wall 24 is formed on the outer peripheral edge of each end face of the bearing outer cylinder 14 so as to be fitted to the outer peripheral surface of the lid member 17. Protrusions 24a (or grooves) extending in the length direction of the outer cylinder 14 are provided on the peripheral surface, and the protrusions 24a of the peripheral wall 24 are provided on the outer peripheral surface of the lid member 17 as shown in FIGS. It is preferable that a groove 17a (or projection) corresponding to (or a groove) is provided.

  When the cover member 17 is pushed into the peripheral wall 24 in a state where the groove 17a of the cover member 17 is fitted to the protrusion 24a of the peripheral wall 24 of the bearing outer tube 14, the sphere holding hole 12 and the sphere of the bearing outer tube 14 are pushed. The spherical turning groove 16 of the lid member 17 can be easily positioned with respect to the passage 13.

  As shown in FIGS. 1, 4 and 5, a hole 24 b penetrating in the thickness direction is formed in the peripheral wall 24 of the bearing outer cylinder 14, and shown in FIGS. 1, 4, 8 and 10. As described above, it is more preferable that a protrusion 17 b that engages with the hole 24 b is formed on the outer peripheral surface of the lid member 17.

  Accordingly, when the lid member 17 is pushed into the peripheral wall 24 of the bearing outer cylinder 14 as described above, the projection 17b of the lid member 17 is inserted into the hole portion 24b of the peripheral wall 24, and the projection 17b, the hole portion 24b, Engage. For this reason, the operation | work which attaches the cover material 17 to the bearing outer cylinder 14 becomes very easy.

  As shown in FIGS. 5 and 6, it is preferable that a slit 23 for opening at least a part of the spherical passage 13 in the length direction is formed on the inner peripheral surface of the bearing outer cylinder 14.

  In maintenance management of the linear motion bearing 10, the shaft body 19 may be extracted from the bearing outer cylinder 14 and a lubricant such as grease may be applied to the spheres 18, 18 ˜ protruding from the opening 12 a of the sphere holding hole 12. When the slit 23 is formed on the inner peripheral surface of the bearing outer cylinder 14, when the lubricant is applied to the spheres 18, 18,... Protruding from the opening 12a of the sphere holding hole 12 as described above, The lubricant can also be applied to the spheres 18, 18,... Accommodated in the sphere passage 13. For this reason, at the time of maintenance management of the linear motion bearing 10, the lubricant can be reliably applied to each spherical body 18 by a simple operation.

  When a part in the length direction of the spherical passage 13 is opened by the slit 23, the wall bodies on both sides of the slit 23 are connected to each other in the remaining portion of the spherical passage 13. By the connecting portion 14b that connects the wall bodies, deformation of the wall bodies when a load is applied from the sphere 18 is suppressed. For this reason, it becomes possible to support a shaft body more stably and precisely.

  FIG. 11 is a cross-sectional view showing another configuration example of the bearing outer cylinder. The configuration of the bearing outer cylinder 34 in FIG. 11 is the same as that of the bearing outer cylinder 14 in FIG. 5 except that the slit for opening the spherical passage as described above is not provided.

  FIG. 12 is a cross-sectional view showing still another configuration example of the bearing outer cylinder. The configuration of the bearing outer cylinder 44 in FIG. 12 is the same as that of the bearing outer cylinder 14 in FIG. 5 except that the entire length of the spherical passage 13 is opened by the slit 43.

  As shown in FIGS. 3 and 4, the shaft outer body 14 of the linear motion bearing 10 has a shaft body 19 whose outer peripheral surface protrudes inside the inner peripheral surface of the outer cylinder 14. By accommodating in contact, the linear motion guide device 30 of the present invention can be configured.

  In the linear motion guide device 30 of the present invention, the linear motion bearing 10 described above is used. For example, even when the shaft body 19 is repeatedly moved at a high speed, the shaft body 19 remains inside the bearing outer cylinder 14. Are supported stably and precisely. For this reason, stable and precise sliding of the shaft body 19 is realized.

  FIG. 13 is a cross-sectional view showing another configuration example of the linear motion guide device of the present invention.

  13 is formed with a plurality of grooves 49a, 49a,... Extending in the length direction on the outer peripheral surface of the shaft body 49. The inner side of the inner peripheral surface of the bearing outer cylinder 14 is formed. 3 is the same as the linear motion guide device 30 shown in FIG. 3 except that the spheres 18 protruding in the direction of engagement with the grooves 49a of the shaft body 49 are engaged.

  In the linear motion guide device 50, since each spherical body 18 held by the bearing outer cylinder 14 is engaged with each groove 49a of the shaft body 49, the rotation of the shaft body 49 in the circumferential direction is prevented.

DESCRIPTION OF SYMBOLS 10 Linear motion bearing 11 Cylinder 12 Sphere holding hole 12a Slit-shaped opening 13 Sphere passage 14 Bearing outer cylinder 14a Linear groove 14b Connection part 15 Sphere circulation path 16 Sphere turning groove 17 Cover material 17a Groove 17b Protrusion 18 Sphere 19 Shaft body 21 Set of sphere holding hole and sphere passage 23 Slit 24 Peripheral wall 24a Protrusion 24b Hole 30 Linear motion guide device 34, 44 Bearing outer cylinder 43 Slit 49 Shaft body 49a Groove 50 Linear motion guide device

Claims (7)

A linear sphere holding hole having a slit-like opening made of a resin material cylinder and having a slit-like opening for holding the sphere in an inner circumferential surface of the cylinder in a circumferential direction of the cylinder, and the cylinder Bearing outer cylinder in which linear spherical passages positioned between the inner peripheral surface and the outer peripheral surface of the body are alternately arranged; the spherical body holding hole attached to each of both end faces of the bearing outer cylinder And an annular lid member having a plurality of spherical turning grooves that form a spherical circulation path by connecting the holding holes and passages adjacent to each other of the spherical passages as a set and connecting to each end of the holding holes and the passages. And a linear motion bearing comprising a plurality of spheres arranged in each sphere circulation path,
A linear motion bearing, wherein a linear groove extending in a length direction of the outer cylinder is formed at a position between a spherical holding hole and a spherical passage adjacent to each other on the outer peripheral surface of the bearing outer cylinder.   The linear motion bearing according to claim 1, wherein the number of linear grooves is equal to the sum of the number of spherical holding holes and the number of spherical passages.   A peripheral wall that fits to the outer peripheral surface of the lid member is formed on the outer peripheral edge of each end surface of the bearing outer cylinder, and a protrusion or groove extending in the length direction of the outer cylinder is provided on the inner peripheral surface of the peripheral wall. The linear motion bearing according to claim 1, wherein a groove or protrusion corresponding to the protrusion or groove of the peripheral wall is provided on the outer peripheral surface of the lid member.   The linear motion bearing according to claim 3, wherein a hole portion penetrating in a thickness direction is formed in a peripheral wall of the bearing outer cylinder, and a protrusion engaging with the hole portion is formed on an outer peripheral surface of the lid member.   The linear motion bearing according to any one of claims 1 to 4, wherein a slit that opens at least a part of the length of the spherical passage is formed in an inner peripheral surface of the bearing outer cylinder.   The shaft body is accommodated in the bearing outer cylinder of the linear motion bearing according to any one of claims 1 to 5 in a state where the outer peripheral surface thereof is in contact with a sphere projecting inside the inner peripheral surface of the bearing outer cylinder. A linear motion guide device.   7. A plurality of grooves extending in the length direction are formed on the outer peripheral surface of the shaft body, and the spheres protruding inside the inner peripheral surface of the bearing outer cylinder are engaged with the grooves of the shaft body. The linear motion guide device described.

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