JP2015108396A - Positioning mechanism, rolling bearing guide device and positioning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning mechanism which can easily enhance the positioning accuracy of a rolling bearing guide device without being influenced by the skill of a worker, the rolling bearing guide device, and a positioning method.SOLUTION: A positioning mechanism comprises: a plurality of first recesses (11) which are formed at a portion of a guide rail (2) opposing a part (6) to be attached; second recesses (13) which are formed at a portion of the part (6) to be attached corresponding to the respective first recesses (11) when the guide rail (2) is arranged in a desired position of the part (6) to be attached; and protrusive members (14) which are commonly fit into the first recesses (11) and the second recesses (13), discharge air in the first recesses (11) and the second recesses (13) at the fitting, and have air vent mechanisms.

Description

  The present invention includes a guide rail, a slider, and a rolling element, a positioning mechanism for a rolling bearing guide device used in various robots, transfer devices, semiconductor manufacturing devices, and the like, a rolling bearing guide device positioned by the positioning mechanism, and a rolling device. The present invention relates to a positioning method for a bearing guide device.

  Conventionally, as a rolling bearing guide device, a linear motion guide device having a linearly extending guide rail and a curved motion guide device having a curved guide rail are known.

  The linear motion guide device includes, for example, a linear guide rail and a slider straddling the guide rail so as to be relatively movable in the longitudinal direction of the guide rail. The slider includes a slider body and a slider slide. End caps are provided at both ends, sometimes leading or trailing, and a large number of rolling elements roll on the rolling path between the guide rail and the slider body while circulating through a circulating path formed in the slider. This realizes a smooth relative movement between the guide rail and the slider. Since the linear motion guide device can be mounted in any direction, in this application, as shown in FIG. 1, the extending direction of the guide rail 2 of the rolling bearing guide device 1 is set to the X axis direction and the X axis direction. A direction perpendicular to the surface of the guide rail 2 that contacts the mounted portion 6 is defined as a Y-axis direction, and a direction perpendicular to both the X-axis direction and the Y-axis direction is defined as a Z-axis direction.

  The curved motion guide device includes a curved guide rail such as a ring, a slider configured to be slidable on the curved guide rail, and a rolling element.

  In such a rolling bearing guide device, before fixing the guide rail to the attached portion, a rectangular fixing member is attached to the attached portion side portion of the guide rail, and the joint portion of the guide rail is connected, There is a mounting structure and a mounting method for a rolling bearing guide device that eliminates the occurrence of a step in the Z-axis direction at the joint of the guide rail and can be smoothly connected (for example, Patent Document 1).

JP 11-294450 A

  However, the above prior art does not improve the accuracy of the mounting position of the entire guide rail of the rolling bearing guide device, and in the invention described in Patent Document 1, the fixing member is loosely fitted to the mounted portion. After installation, slight vibration occurs during carriage travel, and a step in the Z-axis direction occurs on the guide rail.

  In order to fix the guide rail with high positional accuracy, it is conceivable to provide a shoulder portion extending in the X-axis direction along the guide rail, and to fix the guide rail against the shoulder portion, In this case, since the accuracy of the contact surface between the guide rail and the shoulder must be increased, the processing cost becomes expensive. In addition, it is conceivable to install the guide rail while adjusting it in parallel with a high-precision straight ruler as a reference, but the problem is that the accuracy of the mounting position depends on the skill of the worker, and it takes time and labor to adjust the position. There is.

  In view of such problems, the present invention provides a positioning mechanism, a rolling bearing guide device, and a positioning method that can easily increase the positional accuracy of the rolling bearing guide device regardless of the skill of the operator. With the goal.

In order to solve the above problems, in the present invention,
A positioning mechanism used in a rolling bearing guide device having a guide rail that is mounted in surface contact with a mounted portion, and a slider that is slidable on the guide rail,
A plurality of first recesses formed in a portion of the guide rail on the side facing the attached portion;
A second recess formed in a portion of the mounted portion corresponding to the first recess when the guide rail is disposed at a desired position of the mounted portion;
A convex member that is fitted in common to the first concave portion and the second concave portion, and includes an air vent mechanism that discharges air in the first concave portion and the second concave portion at the time of the fitting. A positioning mechanism is provided.

  Preferably, the air vent mechanism is configured by a gap that is continuous from the bottom of the first recess and the second recess to the open end.

  Preferably, the first recess and the second recess are formed so as to have a substantially cylindrical internal space.

Preferably, the convex member has a substantially cylindrical shape,
The air vent mechanism is configured by a flat portion that is formed on the outer peripheral portion over the entire length in the central axis direction of the convex member and that is orthogonal to a straight line that is orthogonal to the central axis.

Preferably, the convex member has a substantially cylindrical shape,
The air vent mechanism is configured by a through-hole portion formed over the entire length in the direction of the central axis about the central axis of the convex member.

Preferably, the convex member has a substantially cylindrical shape,
The air vent mechanism includes a through-hole portion formed over the entire length in the central axis direction of the convex member and a slit formed through the entire length in the central axis direction through the radial direction.

  Preferably, a taper portion having a diameter gradually reduced toward the end portion is formed on the outer peripheral portion in the vicinity of the end portion of the convex member.

  Preferably, the inner peripheral surface in the vicinity of the end portion of the through-hole portion is formed with a radius that becomes larger in inclination with respect to the central axis line toward the end portion and increases in inner diameter dimension.

  Preferably, each of the slits has a pair of corrugations facing each other in a sinusoidal shape in which crests protruding in the circumferential direction and troughs recessed in the circumferential direction are alternately arranged in the central axis direction. It consists of parts.

  Preferably, an end portion of the peak portion or the valley portion is disposed at an end portion of the slit.

  Preferably, the convex member and the guide rail are made of the same material.

Further, in order to solve the above problems, the present invention
Comprising the first recess,
A rolling bearing guide device characterized by being positioned by the positioning mechanism according to any one of claims 1 to 11.

Further, in order to solve the above problems, the present invention
A guide rail positioning method comprising: a guide rail mounted in surface contact with a mounted portion; and a slider slidably straddled on the guide rail,
Forming a plurality of first recesses in the portion of the guide rail on the side facing the attached portion;
Forming a second recess in each portion of the mounted portion corresponding to the first recess when the guide rail is disposed at a desired position of the mounted portion;
Fitting a convex member having an air vent mechanism for discharging air in the first concave portion and the second concave portion in common to the first concave portion and the second concave portion; and A positioning method is provided.

  According to the present invention, it is possible to provide a positioning mechanism, a rolling bearing guide device, and a positioning method that can easily increase the positional accuracy of the rolling bearing guide device regardless of the skill of the worker.

It is a perspective view which shows the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. It is a perspective view which shows the positioning mechanism of the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. It is an expansion perspective view which shows the attachment mechanism of the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. It is a figure which shows the convex member of the rolling bearing guide apparatus which concerns on 1st Embodiment of this application. (A) shows a side surface, and (b) shows an AA enlarged cross section shown in (a). It is a figure which shows the convex member of the rolling bearing guide apparatus which concerns on 2nd Embodiment of this application. (A) is a side view, and (b) is an enlarged cross-sectional view taken along line BB shown in (a). It is an enlarged view which shows the edge part of the convex member of the rolling bearing guide apparatus which concerns on 2nd Embodiment of this application. It is a figure which shows the convex member of the rolling bearing guide apparatus which concerns on 3rd Embodiment of this application. (A) shows a side surface, and (b) shows a CC cross section shown in (a). It is a flowchart which shows the positioning method of the rolling bearing guide apparatus which concerns on 1st Embodiment of this application.

(First embodiment)
A positioning mechanism of the rolling bearing guide device 1 according to the first embodiment of the present application will be described with reference to FIGS. FIG. 1 is a perspective view showing a rolling bearing guide device 1 according to a first embodiment of the present application. In FIG. 1, the rolling bearing guide device 1 is attached to the attached portion 6.

  As shown in FIG. 1, the rolling bearing guide device 1 according to the first embodiment of the present application is composed of a square columnar guide rail 2 and a slider 3 straddled so as to be relatively movable in the longitudinal direction of the guide rail 2. ing.

  The guide rail 2 has a plurality of bolt holes 9 penetrating in the Z-axis direction. The length of the guide rail 2 can be appropriately selected according to the application. The guide rail 2 is formed with corner rolling grooves 7a and 7b and side rolling grooves 8a and 8b having a substantially arc-shaped cross section extending in the X-axis direction. Escape grooves are formed at the bottoms of the side rolling grooves 8a and 8b. The guide rail 2 is fixed to the mounted portion 6 by a bolt 15 passed through the bolt hole 9.

  The slider 3 is attached to the slider main body 3a through the metal slider main body 3a, end caps 4a and 4b attached to both ends that become the head or tail when the slider main body 3a slides, and the end caps 4a and 4b. Side seals 5a and 5b.

  The side seals 5 a and 5 b are made of an elastic body and prevent foreign matter from entering between the slider body 3 a and the guide rail 2. Lubricant supply holes 10a and 10b (10b not shown) are formed in the side seals 5a and 5b, and the lubricant is injected from the injection holes formed in the end caps 4a and 4b through the lubricant supply holes 10a and 10b. can do.

  FIG. 2 is a perspective view showing a positioning mechanism of the rolling bearing guide device 1 according to the first embodiment of the present application. The surface which inclines the rolling bearing guide apparatus 1 and contacts the to-be-attached part 6 is shown. In FIG. 2, the slider 3 is omitted by a two-dot chain line.

  On the surface of the guide rail 2 in surface contact with the mounted portion 6, first recesses 11 and bolt holes 9 are alternately arranged at equal intervals along the center line extending in the X-axis direction. When the guide rail 2 is arranged at a desired position of the mounted portion 6, the mounted portion 6 has a second recessed portion 13 and bolts at positions facing the first recessed portion 11 and the bolt hole 9, respectively. A tap 12 is formed.

  The first recess 11 and the second recess 13 are both perforated so that the internal space is substantially cylindrical, and have substantially the same diameter. A convex member (positioning member) 14 is fitted into the first concave portion 11 and the second concave portion 13 in common. The positioning of the guide rail 2 is performed by fitting the convex member 14 to the second concave portion 13 about half and fitting the convex member 14 so as to cover the first concave portion 11 from above. The convex member 14, the first concave portion 11, and the second concave portion 13 are fitted by an interference fit or an intermediate fit.

  It is preferable that the guide rail 2 and the convex member 14 are formed of the same material. Thereby, by making the natural frequency of the guide rail 2 and the protrusion 14 equal, generation | occurrence | production of resonance can be prevented and it can prevent that the convex member 14 remove | deviates from the 1st recessed part 11 by resonance. As a material of the guide rail 2 and the convex member 14, a metal and resin can be used. As the metal material, carbon steel for machine structure, chromium steel, chromium molybdenum steel, nickel chromium steel, nickel chromium molybdenum steel, carbon tool steel, high speed tool steel, alloy tool steel, stainless steel, bearing steel, etc. may be used. it can. As the resin, plastic, elastomer, and the like can be used. As the plastic, PC (polycarbonate), PET (polyethylene terephthalate), POM (polyacetal), PTFE (fluororesin), PEEK (with mechanical strength) are used. Polyether ether ketone), PF (phenol resin), EP (epoxy resin), and the like can be used. When the convex member and the concave portion are heated to high temperatures due to friction and there is a possibility that creep will occur in the convex member, POM (polyacetal) having creep resistance can be used. As the elastomer, olefin, styrene, vinyl chloride, polyester, polyurethane, polyamide and the like can be used. When there is a possibility that the convex member and the concave portion may become high temperature due to friction, a polyamide system having heat resistance is preferable.

  According to the positioning mechanism, the guide rail can be positioned easily and accurately, and the straightness adjustment work of the guide rail can be made unnecessary.

  FIG. 3 is an enlarged perspective view showing the attachment mechanism of the guide device 1 according to the first embodiment of the present application.

  The guide rail 2 is fixed to the mounted portion 6 by positioning the guide rail 2 by the positioning mechanism, and then inserting a bolt 15 into the bolt hole 9 and screwing it into the bolt tap 12.

  Since the positioning convex members 14 are disposed on both sides of the bolt 15, it is possible to prevent the position of the guide rail 2 from shifting when the bolt 15 is tightened.

  FIG. 4 is a view showing the convex member 14 of the rolling bearing guide device 1 according to the first embodiment of the present application. (A) shows the side surface, and (b) shows the AA cross section shown in (a).

  The convex member 14 has a substantially cylindrical shape, and is provided with an air vent mechanism for venting air in the concave portion when the convex member 14 is inserted into the first concave portion 11 and the second concave portion 13. The air vent mechanism is configured by a flat surface portion 14a that is formed on the outer peripheral portion over the entire length of the convex member 14 in the central axis direction and is orthogonal to a straight line that is orthogonal to the central axis. As shown in FIG. 2B, the flat portion 14a is formed such that a part of the circular cross section is missing.

  As the convex member 14, a commercially available knock pin with an air vent mechanism can be used. By using a commercially available product, high-accuracy positioning can be realized inexpensively, without being affected by the skill of the operator, easily, reliably, safely and efficiently.

  In some commercially available knock pins, the outer diameter part is finished with high accuracy by polishing, and the tolerance of the outer diameter dimension with respect to the recess is ± 5 μm or less, so the roundness of the recess is +5 μm or less. In this case, the error (deviation) amount when the rail of the linear guide is attached to the attachment surface (base) is also within a maximum of about 10 μm. Since roundness is easy to obtain, it can be attached with high precision. High-accuracy knock pins are also commercially available, and the high-precision type outer diameter tolerance for the concave portion is −2 μm. Therefore, if the convex member is used, it can be attached with higher accuracy. When the tolerance is 0 to −5 μm, the convex member and the concave portion are tightly fitted, so that the guide rail 2 and the attached portion 6 do not shift.

  As described above, according to the guide device 1 provided with the first recess 11 and positioned by the positioning mechanism, the guide rail 2 can be positioned easily and accurately without being affected by the skill of the operator. Can do. Deterioration of the mounting accuracy may have an adverse effect mainly on the three elements of the guide device life, friction and accuracy, but according to the present embodiment, it is possible to prevent such adverse effects from occurring. Further, since there are commercially available knock pins with respect to the recesses having an outer diameter tolerance of ± 5 μm or less, the position accuracy of the guide rail 2 can be increased by using a commercially available knock pin, so The straightness of the guide rail 2 is improved. Therefore, since the motion accuracy of the guide device 1 during traveling is improved, the contact between the ball and the groove is not distorted, and the rigidity can be prevented from being lowered without causing deformation of the contact angle.

  Furthermore, by using a convex member with an air vent mechanism, when the convex member is inserted into the concave portion, the air in the concave portion can be easily removed and the convex member can be easily inserted into the concave portion. it can. Also, when removing the convex member from the concave portion, air can easily enter the concave portion, so that the removal work is easy. In addition, in order to further improve the straightness of the guide rail 2, a plurality of guide devices can be used in combination. For example, the 2-rail and 4-slider (bearing) specifications that are commonly used generally have a shorter stroke and an averaging effect due to interference between rails and sliders. The straightness can be increased.

(Second Embodiment)
The positioning mechanism of the rolling bearing guide device according to the second embodiment of the present application will be described with reference to FIG. Since the positioning mechanism of the rolling bearing guide device according to the second embodiment is different from the positioning mechanism of the rolling bearing guide device according to the first embodiment only in the convex member, the description overlapping with the first embodiment is omitted. The convex member will be described.

  FIG. 5 is a view showing the convex member 214 of the positioning mechanism according to the second embodiment of the present application. (A) is the side surface by the side of the slit 214a, (b) has shown the BB cross section shown to (a).

  The convex member 214 has a substantially cylindrical shape, and has a through-hole 214d that penetrates the entire length in the central axis direction around the central axis, and a slit 214a that penetrates in the radial direction and is formed over the entire length in the central axis direction. The cross section perpendicular to the central axis direction is substantially C-shaped. The outer peripheral surfaces in the vicinity of both end portions of the convex member 214 form tapered portions 214b and 214c that are gradually reduced in diameter toward the end portion.

  According to the convex member 214 according to the second embodiment of the present application, the slit 214a and the through hole 214d act as an air vent mechanism, and the convex member 214 can be easily inserted into the concave portion. The smaller the difference in diameter between the convex member and the concave portion, the smaller the positioning error and the higher the positional accuracy. On the other hand, the convex member becomes difficult to enter the concave portion, and the rail mounting operation becomes difficult. However, by providing the tapered portions 214b and 214c, the end of the convex member 214 can be easily inserted into the concave portion, and the guide rail can be efficiently attached while maintaining a high position system. .

  FIG. 6 is an enlarged view showing the periphery of the tapered portion 214c of the convex member 214 of the rolling bearing guide device according to the second embodiment of the present application.

  The inner peripheral surface in the vicinity of the end portion of the convex member 214 forms a radius 214e in which the inclination with respect to the central axis increases toward the end portion and the inner diameter dimension increases. The radius 214e prevents the occurrence of fluid loss and further facilitates insertion into the recess.

  A commercially available spring pin can be used as the convex member 214. The cost for preparing the convex member 214 can be suppressed by using a commercially available product.

  In the present invention, a convex member that does not have the radius 214e, a convex member that does not have the slit 214a, or a convex member that does not have the tapered portions 214b and 214c can be used. .

(Third embodiment)
The positioning mechanism of the rolling bearing guide device according to the third embodiment of the present application will be described with reference to FIG. Since the positioning mechanism of the rolling bearing guide device according to the third embodiment is different from the positioning mechanism of the guide device according to the first embodiment only in the convex member, the description overlapping with the first embodiment is omitted, and the convex member is omitted. Will be described.

  FIG. 7 is a view showing a side surface of the convex member 314 of the positioning mechanism according to the third embodiment of the present application. (A) shows a side surface, and (b) shows a CC cross section shown in (a).

  The convex member 314 has a substantially cylindrical shape, and has a through hole 314d that penetrates in the central axis direction, and a slit 314a that penetrates in the radial direction and is formed over the entire length in the central axis direction, and is perpendicular to the central axis direction. The cross section is formed in a substantially C shape. Each of the slits 314a is formed by a pair of corrugated portions opposed to each other in a sine wave shape in which crests protruding in the circumferential direction and troughs recessed in the circumferential direction are alternately arranged in the central axis direction. Yes. The pair of corrugated parts are formed such that the peak part faces the valley part and the valley part faces the peak part. With such a configuration of the slit 314a, vibration generated when the slider passes through the guide rail is absorbed by the slit 314a, and vibration can be reduced.

  In addition, at both ends of the corrugated portion of the slit 314a, a portion where the positive and negative of the sine wave are switched, that is, an end portion of a peak portion or a valley portion is disposed. Thereby, since the speed of the air discharged | emitted as an exit of an air vent becomes the maximum, the insertion and removal of the convex member 314 to a recessed part can be performed smoothly.

  The outer peripheral surface in the vicinity of both end portions of the convex member 314 forms tapered portions 314b and 314c that are gradually reduced in diameter toward the end portion. Thereby, it becomes easy to insert the end portion of the convex member 314 into the concave portion, and the guide rail can be efficiently attached.

  A commercially available spring pin can be used as the convex member 314. By using a commercially available product, the cost for preparing the convex member 314 can be reduced.

  In the present invention, a convex member that does not have the tapered portions 314b and 314c may be used.

  Finally, a positioning method of the rolling bearing guide device 1 according to the first embodiment of the present application will be described with reference to FIG. The rolling bearing guide device according to the second and third embodiments can be positioned similarly to the first embodiment.

  First, a plurality of first recesses 11 are formed in the guide rail 2 (step S1). Next, the second recess 13 is formed in the portion of the mounted portion 6 corresponding to the first recess 11 when the guide rail 2 is disposed at a desired position of the mounted portion 6 (step S2). Finally, the convex member 14 provided with an air vent mechanism for discharging the air in the first concave portion 11 and the second concave portion 13 is fitted to the first concave portion 11 and the second concave portion 13 in common. (Step S3).

  The first recess 11 and the second recess 13 can be easily formed by drilling using a drill. Further, the fitting of the convex member 14 to the first concave portion 11 and the second concave portion 13 is performed after the convex member 14 is fitted to the second concave portion 13 formed in the attached portion 6 about half, This can be performed by fitting the convex member 14 to the first concave portion 11 so that the convex portion 14 protruding from the concave portion 13 is covered with the first concave portion 11. On the contrary, after the convex member 14 is fitted about half way into the first concave portion 11 formed in the guide rail 2, the convex member 14 protruding from the first concave portion 11 is formed in the attached portion 6. You may insert in and fit in the 2nd recessed part 13 made.

  According to the positioning method, the guide rail can be positioned easily and accurately without being affected by the skill of the operator. Further, the adoption of the air vent mechanism makes it easy to fit the convex member and the concave portion. Therefore, it is possible to perform the mounting operation stably, reliably and efficiently, and to suppress the cost of mounting.

  In the above, specific embodiments have been described for the purpose of describing the present invention, but the present invention is not limited to this, and various modifications and improvements can be made.

  For example, the air vent mechanism is preferably the one shown in the above embodiment, but is not limited to this, and any method can be used as long as the air in the recess can be discharged when the convex member is fitted into the recess. It may be a simple configuration. For example, in the air vent mechanism, if a continuous gap is formed between the inner peripheral surface of the concave portion and the outer peripheral surface of the convex member from the bottom of the concave portion to the opening end of the concave portion, the shape of the concave portion and the shape of the convex member are The present invention is not limited to the above embodiment. For example, the internal space of the recess may be a quadrangular prism, and the protrusion may have a cylindrical shape that fits into the recess. Moreover, you may comprise an air vent mechanism only by the hole part penetrated over the full length of the convex member.

  The convex members and the bolts for fixing the guide rail are preferably arranged alternately along the center line of the guide rail, but are not necessarily limited thereto. In other words, the convex member and the guide rail fixing bolt may be arranged so as to be shifted from the center line, or a plurality of convex members are arranged at a necessary distance depending on the tolerance, the length of the guide rail, and the like. If it is, the position and the number are not limited.

  As described above, according to the present invention, it is possible to provide a positioning mechanism, a guide device, and a positioning method that can easily increase the position accuracy of the guide device regardless of the skill of the worker.

DESCRIPTION OF SYMBOLS 1 Rolling bearing guide apparatus 2 Guide rail 3 Slider 3a Slider main body 4a, 4b End cap 5a, 5b Side seal 6 Mounted part 7a, 7b Corner part rolling groove 8a, 8b Side part rolling groove 9 Bolt hole 10a Lubricant supply Hole 11 First concave portion 12 Bolt tap 13 Second concave portion 14, 214, 314 Convex member 14a Flat portion 214a Slit 214b, 214c, 314b, 314c Taper portion 214d, 314d Through hole 214e Earl 15 bolt

Claims (13)

A positioning mechanism used in a rolling bearing guide device having a guide rail that is mounted in surface contact with a mounted portion, and a slider that is slidable on the guide rail,
A plurality of first recesses formed in a portion of the guide rail on the side facing the attached portion;
A second recess formed in a portion of the mounted portion corresponding to the first recess when the guide rail is disposed at a desired position of the mounted portion;
A convex member that is fitted in common to the first concave portion and the second concave portion, and includes an air vent mechanism that discharges air in the first concave portion and the second concave portion at the time of the fitting. And a positioning mechanism.   The positioning mechanism according to claim 1, wherein the air vent mechanism is configured by a continuous gap from a bottom portion of the first concave portion and the second concave portion to an opening end portion.   The positioning mechanism according to claim 1, wherein the first recess and the second recess are formed so as to have a substantially cylindrical internal space. The convex member has a substantially cylindrical shape,
The said air vent mechanism is comprised by the plane part orthogonal to the straight line orthogonal to this central axis formed in the outer peripheral part over the full length of the central axis direction of the said convex member. The positioning mechanism according to any one of the above. The convex member has a substantially cylindrical shape,
4. The positioning according to claim 1, wherein the air vent mechanism is configured by a through-hole portion formed over the entire length in the central axis direction with the central axis of the convex member as a center. mechanism. The convex member has a substantially cylindrical shape,
The said air vent mechanism is comprised by the through-hole part formed over the full length of the central axis direction of the said convex member, and the slit penetrated in the radial direction and formed over the full length of this central axis direction. The positioning mechanism according to any one of 1 to 3.   The positioning mechanism according to any one of claims 4 to 6, wherein a tapered portion that gradually decreases in diameter toward the end portion is formed on an outer peripheral portion in the vicinity of the end portion of the convex member. .   The inner peripheral surface in the vicinity of the end portion of the through-hole portion is formed with a radius that increases in inclination with respect to the central axis and increases in inner diameter as it goes toward the end portion. The positioning mechanism described.   Each of the slits is composed of a pair of corrugated portions facing each other in a sine wave shape in which crests protruding in the circumferential direction and troughs recessed in the circumferential direction are alternately arranged in the central axis direction. The positioning mechanism according to claim 6.   The positioning mechanism according to claim 9, wherein an end portion of the peak portion or the valley portion is disposed at an end portion of the slit.   The positioning mechanism according to claim 1, wherein the convex member and the guide rail are made of the same material. Comprising the first recess,
A rolling bearing guide device that is positioned by the positioning mechanism according to claim 1. A guide rail positioning method comprising: a guide rail mounted in surface contact with a mounted portion; and a slider slidably straddled on the guide rail,
Forming a plurality of first recesses in the portion of the guide rail on the side facing the attached portion;
Forming a second recess in each portion of the mounted portion corresponding to the first recess when the guide rail is disposed at a desired position of the mounted portion;
Fitting a convex member having an air vent mechanism for discharging air in the first concave portion and the second concave portion in common to the first concave portion and the second concave portion; and A positioning method comprising:

Images