JP6393496B2 - Linear motion guide unit with lubrication member - Google Patents

Description

  The present invention relates to a linear motion guide unit in which a slider that moves relatively on a round shaft is provided with a lubrication component.

  In the conventional linear motion guide unit, oil lubrication or grease lubrication is performed. However, if the lubrication maintenance time is greatly reduced by extending the lubrication replenishment interval, a lubrication member in which the slider is impregnated with the lubricant is used. Was attached.

  The applicant has developed a linear motion guide unit with a lubrication plate and has filed a patent application earlier. The linear motion guide unit is composed of a track shaft in which a track groove is formed along the longitudinal direction, and a slider that moves relative to the track shaft so as to surround the track shaft, and allows the slider to self-lubricate. Therefore, the slider was provided with a lubrication plate assembly. The slider and the lubrication plate assembly are housed in a housing and attached so as not to be removed by a retaining ring. The lubrication plate assembly includes a case, a lubrication plate of a sintered resin member having a porous structure impregnated with a lubricant in the case, and an end seal. The lubrication plate main body constituting the lubrication plate is configured to gradually supply the lubricant to the track shaft whenever the slider slides (see, for example, Patent Document 1).

  Conventionally, as a slide bearing, one that supplies a lubricant evenly to the outer periphery of a slide shaft is known. In the slide device, a lubricant supply member for supplying a lubricant to the slide shaft is attached to an end portion of the slide cylinder, and the slide cylinder is provided with a cylinder body and a lubricant supply member attached to the end portion of the cylinder body. A rolling element that is in rolling contact with the outer periphery of the slide shaft is mounted on the inner periphery of the cylinder. The lubricant supply member has a frame shape having an internal space, a plurality of housing recesses are formed in the internal space via partition walls, and a notch groove communicating with the housing recess is formed, and a lubricant is impregnated in each case. The lubricant supply pad is housed in the housing recess, protrudes from the inner periphery of the case through the notch groove, and has a protrusion that contacts the outer periphery of the slide shaft. Since the inside of the case is partitioned by the partition wall, the uneven distribution of the lubricant in the case is prevented, and the lubricant is evenly supplied to the outer periphery of the slide shaft (see, for example, Patent Document 2).

JP 2000-035038 A JP 2008-215482 A

  By the way, in the linear motion guide unit, the lubricating plate assembly has a structure in which the number of parts is large and a large space is required in the housing. In addition, when the lubricant supply member is formed of a fiber material such as felt having a predetermined fiber density as in the slide bearing, the lubricant is easily discharged from the lubricant supply member and consumed quickly. There is a fear that it will end.

  An object of the present invention is to solve the above-mentioned problems, and is a round shaft type linear motion guide unit having an external type lubrication member. It is an object of the present invention to provide a linear motion guide unit including a lubricating member that is configured so that a lubricating member can be easily fixed therebetween and that can properly and reliably supply a lubricant to a necessary portion of a track.

The present invention comprises a long round shaft having a first raceway surface and a slider that slides relative to the round shaft via a ball of a rolling element, the slider corresponding to the first raceway surface. A casing in which a second raceway surface and a return path parallel to the second raceway surface are formed, a raceway path that holds the ball in the casing and includes the first raceway surface and the second raceway surface, and the return path And a pair of side plates which are disposed at both ends of the casing and position the retainer and the casing in the axial direction, and are disposed at both end surfaces of the casing. A pair of C-shaped retaining rings for axially positioning the lubricating member and the casing in the hollow hole of the housing, and a housing in which the casing and the lubricating member are accommodated in the hollow hole And the track path, in the linear motion guide unit comprising by comprising the ball rolling a circulation path consisting of a pair of the direction changing passage and the return passage,
The lubrication member is formed of a C-shaped thin plate impregnated with a lubricant so as to be elastically deformable, and has a C-shaped main body portion adjacent to the inner peripheral wall surface of the hollow hole of the housing, and an inner portion of the main body portion. A plurality of oil supply portions projecting from the peripheral side and contacting the first raceway surface of the round shaft, and a tip portion of the oil supply portion serving as a contact portion to the round shaft corresponds to the raceway. locked position engaged to the front Symbol casing to the position, also the lubricating member, said by opening and closing the opening of the C-shaped thin plate is elastically deformable, the oil supply portion of the lubricating member said of the round shaft Predetermined predetermined tightening allowance is given to the first raceway surface, and the main body portion is given a tightening allowance from a clearance fit state to the inner peripheral wall surface of the hollow hole of the housing Chokudoan, characterized in that incorporated in On the unit.

  In this linear motion guide unit, the circumferential positioning of the lubricating member with respect to the casing is achieved by engaging a notch concave portion formed on the end surface of the casing with a convex portion formed on the end surface of the lubricating member. It is.

  In addition, the side plates are respectively arranged and incorporated in first annular grooves formed at both ends of the casing, and the C-shaped retaining ring is formed on the inner peripheral wall surface of the hollow hole of the housing. Each of the paired second annular grooves is arranged and incorporated.

  The lubricating member has holes formed at both ends of the opening, and the holes are incorporated into the housing together with the C-shaped retaining ring, so that a mounting tool can be inserted. It is what.

  Further, the raceway constituted by the first raceway surface of the round shaft and the second raceway surface of the slider is at least in a plurality of rows, and the oil supply portion of the lubricating member extends from the main body portion to the raceway route. Projecting in correspondence with the plurality of rows.

  In this linear motion guide unit, a tip end portion of the oil supply portion of the lubricating member is formed in a cylindrical surface, a tip end portion of the cylindrical surface is formed in a convex curved surface, and the convex curved surface is the first raceway surface of the round shaft. Line contact is possible. Alternatively, the oil supply portion of the lubricating member is substantially formed in a trapezoidal shape, the tip of the trapezoid is formed in a concave curved surface, and the concave curved surface is in surface contact with the first raceway surface of the round shaft. It has become.

The lubricating member is formed in a structure integrated with the C-shaped retaining ring, and an outer diameter side edge portion of the C-shaped retaining ring is formed so as to protrude from an outer diameter edge portion of the lubricating member. Alternatively, in this linear motion guide unit, a spacer is provided between the lubricating member and the C-shaped retaining ring to back up the oil supply portion of the lubricating member.

As described above, the linear motion guide unit provided with the lubricating member according to the present invention has a lubricating member disposed at both ends of the casing, and the oil supply portion of the lubricating member has a round shaft corresponding to the raceway on which the ball rolls. Since lubrication is made in contact with the raceway surface, the lubricant can be supplied for a long period of time by supplying an appropriate amount at all times without excessive supply of lubricant to the raceway surface of the round shaft, thus realizing maintenance-free lubrication. Further, this linear motion guide unit has a simple structure, and if a plurality of lubricating members are arranged in a stacked manner, the amount of lubricant impregnated in the lubricating members can be easily increased. Furthermore, in this linear motion guide unit, the lubrication member is composed only of a member impregnated with a lubricant. In some cases, if a general-purpose C-type retaining ring and a lubrication member are integrally formed, the axial dimension can be reduced. As it is, the housing can be easily incorporated into the hollow hole. In addition, the lubrication part of the lubrication member attached to the slider is formed in a convex or concave curved surface, so that the contact surface that contacts the round shaft of the lubrication part can be made small, and the sliding resistance of the slider on the round shaft is reduced. can do. In other words, if the tip of the oil supply part is formed in a cylindrical surface shape, it will be in line contact or surface contact with the raceway surface of the round shaft, the area of the contact portion with the round shaft will be smaller, and sliding resistance will be further reduced . Additionally, lubricating member and is formed in a substantially C-shaped, even if the interference with respect to the raceway surface of the round shaft is large, spread elastically deformed by the opening of a substantially C-shaped spread, the slider sliding resistance Is formed in a structure that is difficult to increase.

FIG. 3 is a side view showing a linear motion guide unit including a lubricating member according to the present invention, and showing a casing, a side plate, a lubricating member, and a C-shaped retaining ring in a hollow hole of a housing by dotted lines. It is sectional drawing which shows the linear motion guide unit in the AA position of FIG. FIG. 3 is a cross-sectional view showing the linear motion guide unit at the BB position in FIG. 2. It is sectional drawing which shows the linear guide unit in CC position of FIG. It is a front view which shows the slider seen from the axial direction in the state which removed the housing in the linear motion guide unit of FIG. It is a perspective view which shows the linear bushing which comprises the slider in the linear guide unit of FIG. It is a perspective view which shows one Example of the lubricating member which comprises the slider which removed the housing in the linear guide unit of FIG. It is a front view which shows the lubricating member of FIG. It is sectional drawing which shows the lubricating member in the DD position of FIG. It is a front view which shows the slider which removed the housing in this linear motion guide unit, and was equipped with the lubricating member of another Example. It is a perspective view which shows the lubrication components which comprise the slider of FIG. It is a front view which shows the lubricating member of FIG. It is sectional drawing which shows the lubricating member in the EE position of FIG. It is a perspective view which shows another Example of the lubricating member which comprised the C-shaped retaining ring which comprises the slider in this linear motion guide unit in integral structure. It is a front view which shows the lubricating member which comprised the C-shaped retaining ring seen from the F direction of FIG. It is a side view which shows the lubricating member which comprised the C-shaped retaining ring of FIG. 14 in the integral structure. FIG. 5 is a cross-sectional view showing another embodiment of this linear motion guide unit and showing the linear motion guide unit at a position corresponding to the BB position in FIG. 2. FIG. 6 is a sectional view showing the linear motion guide unit in a state corresponding to the BB position in FIG. 2 in a state where the linear motion bushing is configured as an end cap type linear bushing according to another embodiment of the linear motion guide unit. .

  Embodiments of a linear motion guide unit having a lubricating member according to the present invention will be described below with reference to the drawings. First, with reference to FIGS. 1-9, one Example (1st Example) of the linear guide unit provided with the lubricating member by this invention is demonstrated. The linear motion guide unit generally has a long round shaft 1 having a raceway surface 11 (first raceway surface) extending in the longitudinal direction of the outer peripheral surface, and a ball 7 as a rolling element on the round shaft 1. The linear bushing type includes a slider 2 that slides relatively. The slider 2 includes a cylindrical casing 3 in which a raceway surface 12 (second raceway surface) extending in the longitudinal direction corresponding to the raceway surface 11 and a return path 20 extending in parallel to the raceway surface 12 are formed. The pair of side plates 4 disposed in the portion 18 and positioning the cage 8 and the casing 3 in the axial direction, the lubricating members 5, respectively disposed on both end surfaces 17 of the casing 3, and the casing 3 and the lubricating member 5 are hollow. The housing 9 accommodated in the hole 10 and the end surface 42 of the lubricating member 5 are respectively disposed in the hollow hole 10 of the housing 9 and the casing 3 and the lubricating member 5 are positioned in the longitudinal direction in the hollow hole 10 of the housing 9. A pair of C-shaped retaining rings 6 are provided. A rolling element interposed between the round shaft 1 and the slider 2 is a ball 7, and the ball 7 rolls on a raceway path 38 including a raceway surface 11 and a raceway surface 12. The cage 8 has a function of holding the ball 7 in the casing 3, and the cage 8 is formed with a direction changing path 39 that communicates the track path 38 and the return path 20. When the ball 7 which is a rolling element rolls on the raceway surface 12 of the casing 3, the cage 7 formed with the direction change path 39 which connects the raceway surface 11 and the raceway surface 38 including the raceway surface 12 and the return path 20 is formed. 8 is held in the casing 3. The ball 7 is configured to roll on a circulation path 40 including a track path 38, a pair of direction change paths 39 and a return path 20 as the slider 2 reciprocates on the round shaft 1. Yes. In this linear motion guide unit, the track path 38 composed of the track surface 11 of the round shaft 1 and the track surface 12 of the slider 2 is four rows in this embodiment. In this linear motion guide unit, the casing 3 constituting the slider 2 has an outer cylinder shape, and its dimensions are, for example, an outer cylinder outer diameter of 12 mm and an outer cylinder length of 19 mm. Yes. The round shaft 1 has a diameter of 6 mm. The fitting of the casing 3 with the hollow hole 10 of the housing 9 is, for example, a clearance fit. In the slider 2, the axial positioning of the casing 3 and the lubricating member 5 with respect to the housing 9 is performed by a pair of C-shaped retaining rings 6.

  In this linear motion guide unit, in particular, the lubricating member 5 is formed from a C-shaped thin plate impregnated with a lubricant so as to be elastically deformable, and is positioned adjacent to the inner peripheral wall surface 37 of the hollow hole 10 of the housing 9. A C-shaped main body portion 15 and a plurality of oil supply portions 16 that protrude from the inner peripheral side of the main body portion 15 and come into contact with the raceway surface 11 of the round shaft 1 are the contact portions 32 of the oil supply portion 16. The lubricating member 5 is positioned and locked with respect to the casing 3 in order to position the distal end portion 43 in correspondence with the track 38. Specifically, the means for positioning the lubricating member 5 in the circumferential direction with respect to the casing 3 includes a notch concave portion 31 formed on the end surface 17 of the casing 3 and a convex portion 30 formed on the end surface 41 of the lubricating member 5. By engaging, the lubricating member 5 can be positioned in the circumferential direction with respect to the casing 3. That is, the lubricating member 5 is set in advance so as to be aligned and attached so that the position of the oil supply portion 16 coincides with the circumferential position of the track path 38 of the slider 2. Since this linear motion guide unit is of a four-row type, in the embodiment, the oil supply portion 16 of the lubricating member 5 corresponds to the raceway 38 and the lubricating member 5 is circularly moved from the main body portion 15 to the raceway 38. It is formed at a position that divides into four equal portions of 90 ° in the circumferential direction. In this embodiment, a linear motion guide unit in which the track 8 is a four-row type is described, but the rows of the track 38 are appropriately arranged in a plurality of rows, such as 3, 5 and 8 rows. Of course, these lines can be appropriately changed according to the apparatus incorporating the linear motion guide unit. In this linear motion guide unit, when the raceway 38 has a plurality of rows, a plurality of oil supply portions 16 of the lubricating member 5 are projected from the main body portion 15 corresponding to the plurality of rows of the raceway 38. is there.

  Further, the lubricating member 5 can be elastically deformed in a direction to open and close the opening 19 of the C-shaped thin plate, and the oil supply portion 16 of the lubricating member 5 is predetermined with respect to the raceway surface 11 of the round shaft 1. A tightening allowance is given, and the main body 15 is incorporated in a state where the allowance is given from the clearance fitting state to the inner peripheral wall surface 37 of the hollow hole 10 of the housing 9. The lubricating member 5 is substantially formed in a substantially C-shape, and four oil supply portions 16 are formed on the inner peripheral side of the main body portion 15 so as to correspond to the track path 38 of the slider 2. The tip shape of the oil supply portion 16 is formed in a convex curved surface 24 which is a cylindrical portion 23, and the tip portion 29 of the oil supply portion 16 is formed so as to supply oil in line contact with the raceway surface 11 of the round shaft 1. . That is, the front end portion 43 which is the contact portion 32 of the oil supply portion 16 of the lubricating member 5 is formed on the cylindrical surface, and the cylindrical surface can be in line contact with the raceway surface 11 of the round shaft 1. If the lubricating member 5 is brought into contact with the entire surface of the round shaft 1, the sliding resistance may increase. Therefore, in order to reduce the contact area, the shape is formed so as to contact at the position of the track path 38 of the slider 2. . The lubricating member 5 has holes 22 formed at the positions of both end portions 25 of the C-shaped thin plate. The oil supply portion 16 of the lubricating member 5 is provided with a tightening margin with respect to the raceway surface 11 of the round shaft 1. In the embodiment, the tightening margin of the oil supply portion 16 of the lubricating member 5 with respect to the raceway surface 11 of the round shaft 1 is 0.149 mm at the maximum and 0.039 mm at the minimum. For example, the tolerance zone class of the hollow hole 10 of the housing 9 having a diameter of φ12 mm is H7, and the outer radius tolerance zone class of the round shaft 1 having a diameter of φ6 mm is g6.

In this linear motion guide unit, the side plates 4 are respectively disposed and incorporated in annular grooves 13 (first annular grooves) formed in both end portions 18 of the casing 3. Further, the general-purpose C-shaped retaining ring 6 is disposed and incorporated in a pair of annular grooves 14 (second annular grooves) formed in the inner peripheral wall surface 37 of the hollow hole 10 of the housing 9. Therefore, in this linear motion guide unit, the casing 3 and the lubricating member 5 are configured so as not to come off in the axial direction by the C-shaped retaining ring 6 in the housing 9. For the C-shaped retaining ring 6, for example, the diameter of the annular groove 13 is 12.5 mm, as applied to the hollow hole 10 having an inner diameter of 12 mm. The dimensions of the C-shaped retaining ring 6 are such that the outer diameter is 13 mm and the thickness is 1 mm. The width dimension of the C-shaped retaining ring 6 is about 1.8 mm, and the width dimension at the end position is about 3.3 mm. Further, the diameter of the hole 21 formed at the end position of the C-shaped retaining ring 6 used at the time of attachment is 1.5 mm at the minimum, and the lubricating member 5 is composed of the C-shaped retaining ring 6 and the end face 17 of the casing 3. Is built in between.

This linear motion guide unit is a small type with a small shaft diameter, and the sliding resistance of the slider 2 is small. Therefore, it is not necessary to provide a spacer for supporting the lubricating member 5 to prevent deformation. Further, the size of the main body 15 of the lubricating member 5 is about 12 mm in outer diameter, about 8.5 mm in inner diameter, and the holes 22 at both ends of the main body 15 are round holes having a diameter of about 0.8 mm. It is formed in a through-hole. The oil supply portion 16 is formed in an arc shape with a radial dimension of about 1.8 mm, and the tip portion 29 of the oil supply portion 16 is formed so as to contact the raceway surface 11 of the round shaft 1. Further, the thickness of the lubricating member 5 is about 2 mm, and the hole 22 can be used when the lubricating member 5 is incorporated into the hollow hole 10 of the housing 9. A tool for attaching the C-shaped retaining ring 6, for example, the tip of a pliers, is inserted into the hole 22, and the lubricating member 5 and the C-shaped retaining ring 6 can be assembled together in the hollow hole 10 of the housing 9.

  This linear motion guide unit can be assembled as follows. First, the hole 22 of the lubricating member 5 and the hole 21 which is a through-hole formed in the end portion 26 of the C-shaped retaining ring 6 are overlapped with each other, and the overlapped lubricating member 5 and the hole of the C-shaped retaining ring 6 are overlapped. Insert the tip of an attachment tool (not shown) into the parts 21 and 22. By moving the C-shaped retaining ring 6 and the lubricating member 5 in the circumferential direction with an installation tool so that the row position of the slider 2 and the position of the oil supply portion 16 of the lubricating member 5 coincide, the convex portion of the lubricating member 5 30 is fitted into the notch recess 31 of the casing 3 and aligned. Lubricating member 5 and C-shaped retaining ring 6 are elastically deformed by a mounting tool, the diameter is reduced to a smaller outer diameter, and elastically deformed lubricating member 5 and C-shaped retaining ring 6 are connected to a hollow hole in housing 9. When the C-shaped retaining ring 6 is fitted in the recessed groove for retaining ring of the hollow hole 10 of the housing 9, the applied force is loosened and lubricated with the C-shaped retaining ring 6. The assembly with the member 5 is completed.

  The lubricating member 5 is formed of a porous molded body impregnated with a lubricant, and the porous molded body is a sintered resin that is thermoformed in a state in which high-molecular-weight synthetic resin fine particles are compacted, A space in which the synthetic resin fine particles communicate with each other, that is, an open pore, is impregnated with a lubricant. The oil supply portion 16 of the lubricating member 5 is a portion that supplies a lubricant to the raceway surface 11 of the round shaft 1. The lubricant impregnated in the lubricating member 5 moves from the main body portion 15 to the oil supplying portion 16 by capillary action according to the amount of lubricant impregnated in the oil supplying portion 16, and the lubricant impregnated in the lubricating member 5 is retained. As long as there is no contact, it will not leak to the outside.

Next, another embodiment (second embodiment) of the linear motion guide unit having the lubricating member according to the present invention will be described with reference to FIGS.
The oil supply portion 16A of the lubricating member 5A is substantially formed in a substantially trapezoid 27, the tip portion 43 of the trapezoid 27 is formed in a concave curved surface 28, and the concave curved surface 28 is in surface contact with the track surface 11 of the round shaft 1. It is possible. The oil supply portion 16 </ b> A is formed in a shape in surface contact with the raceway surface 11 of the round shaft 1. In this embodiment, the oil supply portion 16A comes into surface contact with the round shaft 1 and supplies the lubricant to the raceway surface 11 of the round shaft 1, so that the alignment of the oil supply portion 16A is facilitated. That is, even if the position of the oil supply portion 16A is slightly deviated in the circumferential direction, the ball 7 can be contacted with the position of the raceway surface 11 of the round shaft 1 on which the ball 7 rolls, and the oil can be supplied to the entire outer peripheral surface of the round shaft 1. Compared with the conventional structure that contacts, the sliding resistance can be significantly reduced. The tightening allowance of the lubrication member 16A of the lubricating member 5A with respect to the raceway surface 11 of the round shaft 1 is the same as that of the embodiment shown in FIGS. 1 to 9, and is set to 0.149 mm at the maximum and 0.039 mm at the minimum. ing.

Next, still another embodiment (third embodiment) of the linear motion guide unit provided with the lubricating member according to the present invention will be described with reference to FIGS.
The lubricating member 5B is formed in a structure integrated with the C-shaped retaining ring 6A, and the edge 34 on the outer diameter side of the C-shaped retaining ring 6A protrudes from the edge 33 on the outer diameter side of the lubricating member 5B. , An edge 34 on the outer diameter side of the C-shaped retaining ring 6 </ b> A is disposed in the annular groove 14 of the housing 9. In this embodiment, the oil supply portion 16 of the lubricating member 5B is formed in a convex curved surface that is a cylindrical surface, as in the first embodiment, and the tip portion 29 of the oil supply portion 16 is formed. Is formed so as to be in line contact with the raceway surface 11 of the round shaft 1 to supply oil. Since this embodiment has substantially the same configuration as that of the first embodiment except that the lubricating member 5B and the C-shaped retaining ring 6A are integrated, the same reference numerals are given to the same members. Omitted.

  Next, with reference to FIG. 17, another embodiment (fourth embodiment) of the linear motion guide unit provided with the lubricating member according to the present invention will be described. The linear motion guide unit of this embodiment is a large linear bushing type, and a spacer 35 is provided between the C-shaped retaining ring 6 and the lubricating member 5 to back up the oil supply portion 16 of the lubricating member 5. Has been. The spacer 35 serves to support the lubrication member 16 of the lubricating member 5 that receives sliding resistance so as not to be deformed. Since this embodiment has substantially the same configuration as that of the first embodiment except that the spacer 35 is provided, the same members are denoted by the same reference numerals, and description thereof is omitted.

Next, still another embodiment (fifth embodiment) of the linear motion guide unit having the lubricating member according to the present invention will be described with reference to FIG.
The linear motion guide unit of this embodiment is a linear bushing in which the side plate 4 of the first embodiment is formed from an end cap 36. Since this embodiment has substantially the same configuration as that of the first embodiment except that an end cap 36 is used instead of the side plate 4, the same reference numerals are given to the same members, and descriptions thereof are omitted.

  The linear motion guide unit having a lubricating member according to the present invention is incorporated in various devices such as semiconductor manufacturing equipment, precision machinery, measuring / inspecting equipment, medical equipment, various robots, various assembling equipment, transporting machines, machine tools, and micromachines. It is preferable to use it.

DESCRIPTION OF SYMBOLS 1 Round shaft 2 Slider 3 Casing 4 Side plate 5, 5A, 5B Lubrication member 6, 6A C type retaining ring 7 Ball (rolling element)
8 Cage 9 Housing 10 Hollow hole (Housing hole)
11 Track surface (first track surface)
12 Track surface (second track surface)
13 annular groove (first annular groove)
14 annular groove (second annular groove)
DESCRIPTION OF SYMBOLS 15 Main-body part 16,16A Oil supply part 17 End surface 18,25,26 End part 19 Opening part 20 Return path 21,22 Hole part 23 Cylindrical part 24 Convex surface 27 Trapezoid 28 Concave surface 29,43 Tip part 30 Convex part 31 Notch Recesses 32 contact portions 33, 34 edges 35 spacers 36 end caps 37 inner wall surfaces 38 track paths 39 direction change paths 40 circulation paths 41, 42 end faces

Claims (9)

A long round shaft provided with a first raceway surface, and a slider that slides relative to the round shaft via balls of rolling elements, the slider being a second raceway surface corresponding to the first raceway surface. And a casing formed with a return path parallel to the second raceway surface, holding the ball in the casing and communicating the return path with the raceway path composed of the first raceway surface and the second raceway surface. A cage in which a direction change path is formed, a pair of side plates that are disposed at both ends of the casing and positions the cage and the casing in the axial direction, and a lubricating member that is disposed on both end surfaces of the casing. A housing housing the casing and the lubricating member in a hollow hole, a pair of C-shaped retaining rings for axially positioning the lubricating member and the casing in the hollow hole of the housing, and the rail Road, the linear motion guide unit comprising by comprising the ball rolling a circulation path consisting of a pair of the direction changing passage and the return passage,
The lubrication member is formed of a C-shaped thin plate impregnated with a lubricant so as to be elastically deformable, and has a C-shaped main body portion adjacent to the inner peripheral wall surface of the hollow hole of the housing, and an inner portion of the main body portion. A plurality of oil supply portions projecting from the peripheral side and contacting the first raceway surface of the round shaft, and a tip portion of the oil supply portion serving as a contact portion to the round shaft corresponds to the raceway. locked position engaged to the front Symbol casing in a position,
The lubricating member can be elastically deformed by opening and closing an opening of the C-shaped thin plate, and the oil supply portion of the lubricating member is a predetermined predetermined with respect to the first raceway surface of the round shaft. A linear motion guide is provided, wherein the body portion is incorporated in a state in which a clearance is given from a clearance fit state to the inner peripheral wall surface of the hollow hole of the housing. unit.   2. The circumferential positioning of the lubricating member with respect to the casing is achieved by engaging a notch recessed portion formed on an end surface of the casing with a convex portion formed on the end surface of the lubricating member. The linear motion guide unit described in 1. The side plates are arranged and incorporated in first annular grooves respectively formed at both end portions of the casing, and the C-shaped retaining ring is formed on the inner peripheral wall surface of the hollow hole of the housing. linear motion guide unit according to claim 1 or 2, characterized in that it is arranged, respectively, incorporated in the pair of second annular groove. The lubricating member has holes formed at both ends of the opening, and the holes are incorporated into the housing together with the C-shaped retaining ring, so that a mounting tool can be inserted. The linear motion guide unit according to any one of claims 1 to 3.   The raceway constituted by the first raceway surface of the round shaft and the second raceway surface of the slider is at least in a plurality of rows, and the oil supply portion of the lubricating member extends from the main body portion to the trackway. The linear motion guide unit according to any one of claims 1 to 4, wherein the linear motion guide unit projects corresponding to a plurality of rows. The tip of the lubrication member of the lubricating member is formed in a cylindrical surface, the tip of the cylindrical surface is formed in a convex curved surface, and the convex curved surface can be in line contact with the first raceway surface of the round shaft. The linear motion guide unit according to any one of claims 1 to 5 , wherein the linear motion guide unit is formed. The oil supply portion of the lubricating member is substantially formed in a trapezoidal shape, the tip of the trapezoid is formed in a concave curved surface, and the concave curved surface can come into surface contact with the first raceway surface of the round shaft. The linear motion guide unit according to any one of claims 1 to 5 , wherein the linear motion guide unit is provided. The lubricating member is formed into a structure integrated with the C-shaped retaining ring, and an outer diameter side edge portion of the C-shaped retaining ring is formed to protrude from an outer diameter edge portion of the lubricating member. linear motion guide unit according to any one of claims 1 to 7, characterized. Between the lubricating member and the C-shaped retaining ring is, according to any one of claims 1 to 7, spacers for backing up fueling portion of the lubricating member is characterized in that it is interposed Linear motion guide unit.

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