JP2008039041A - Linear guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a linear guide device capable of suppressing fretting while reducing maintenance cost and manufacturing cost. <P>SOLUTION: An endless circulating path for circulating many rolling elements 3 consists of a rolling element rolling path 14, a rolling element returning path 13 and a direction changing path provided for a pair of end caps 2B, 2C attached to both end parts of a bearing block 2A. Crowns 16, 18 are formed at both the end parts of the bearing block 2A. A surface contacting with a rolling element 3 of the crown 16 is a plane surface of a predetermined crown inclination angle θ1 and a surface contacting with a rolling element 3 of the other crown 18 is a plane surface of a predetermined crown inclination angle θ2 (θ1<θ2). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is an infinite circulation path in which a plurality of rolling elements roll as machine parts for guiding a linearly moving object, used in various machines such as machine tools, injection molding machines, semiconductor manufacturing machines, transport machines, industrial robots, etc. The present invention relates to a linear guide device having

The linear guide device that guides the guided object linearly while rolling the rolling elements such as rollers and balls infinitely inside is a variety of machines such as the above-mentioned machine tools, injection molding machines, semiconductor manufacturing machines, transport machines, industrial robots, etc. It is one of the important machine elements that have a great influence on the motion accuracy.
This linear guide device includes a guide rail provided with rail-side rolling element rolling grooves on a side surface along the axial direction, and a slider movably straddled on the guide rail. The slider includes a slider body and a pair of end caps attached to both ends of the slider body in the axial direction. The slider body rolls on the slider-side rolling element facing the rail-side rolling element rolling groove. A rolling element rolling path is formed by forming a groove, a rolling element return path and a pair of ends attached to both ends of the slider body in the moving direction so as to be substantially parallel to the rolling element rolling path. A curved path provided on the cap and communicating the rolling element rolling path and the rolling element return path.

  When the rolling elements of the linear guide device circulate infinitely through the rolling element rolling path, the curved path, and the rolling element return path, periodic minute vibrations (hereinafter referred to as rolling element passing vibrations) are generated. It greatly affects the accuracy of movement. The rolling element passing vibration is generated when a rolling element rolling on the rolling element rolling path (load area) while receiving a load due to a preload or an external load exits from the load area to the rolling element circulation path (no load area). It appears when the load is released at the same time, or conversely, when the load is entered from the no-load range to the load range.

In order to suppress this rolling element passing vibration, by providing crowning at both ends of the slider-side rolling element rolling groove forming the rolling element rolling path, the load fluctuation accompanying the entering and exiting of the rolling element in the load area is gradually reduced. By doing so, rolling element passing vibration can be reduced.
The shape of the crowning is generally an arc shape or a linear shape. For example, the rigidity of the slider body in one of the vertical direction (vertical direction), the horizontal direction, and the rolling direction is kept substantially constant, and By setting the slider body to have a shape in which the rigidity in one or both of the pitching direction and yawing direction is kept substantially constant, the amount of elastic displacement generated in the rolling elements in the rolling element rolling path and the rolling element return path becomes substantially constant. There is one that suppresses the generation of rolling element passing vibration when the slider body moves (for example, Patent Document 1).

By the way, in the linear guide device of Patent Document 1, the shape of the crowning at one end of the slider-side rolling element rolling groove is the same as the shape of the crowning at the other end. Thereby, the revolution slip amount of the rolling element which rolls in contact with the crowning does not change between the one end cap and the other end cap.
In this way, if the revolving slip of the rolling element that rolls in contact with the crowning at both ends of the slider-side moving element rolling groove does not change, the slider moves on one side in the axial direction on the guide rail and returns to the original position. If the returning operation is repeated, the rolling element rolls at an equal speed in the infinite circulation path, so that the same part of the rolling element and the infinite circulation path may come into contact with each other many times and fretting may occur.

Here, as a method for preventing fretting, a method of supplying grease for anti-fretting to the contact portion between the rolling element and the infinite circulation path (for example, Patent Document 2), a contact surface between the rolling element and the infinite circulation path, There is known a method (for example, Patent Document 3) for performing a surface treatment for increasing the hardness.
Japanese Patent Laid-Open No. 2000-120684 JP 2004-156761 A JP2003-120693A

However, since Patent Document 2 must regularly replenish expensive anti-fretting grease, there is a risk that maintenance costs will increase. In order to improve the fretting performance, it is conceivable to lower the clay of the grease. However, in this case, it is difficult to form a grease film, and the durability of the linear guide device may be reduced.
Moreover, since the method of surface-treating to the contact surface of a rolling element and an infinite circulation path like patent document 3 requires surface treatment equipment, there exists a possibility that manufacturing cost may increase.

  The present invention has been made in order to eliminate such inconvenience, and a linear guide device capable of suppressing fretting without reducing the maintenance cost and manufacturing cost without supplying grease or performing surface treatment. The purpose is to provide.

  In order to solve the above-mentioned problems, the linear guide device according to claim 1 according to the present invention includes a guide rail having a rail-side rolling element rolling groove extending in the axial direction, and the guide rail having movement in the axial direction. A slider body supported by a guide rail, wherein the slider forms a slider-side rolling element rolling groove facing the rail-side rolling element rolling groove to provide a rolling element rolling path; The rolling element provided on a rolling element return path provided in the slider body so as to be substantially parallel to the rolling element rolling path and a pair of end caps attached to both ends of the slider body in the moving direction. In a linear guide device comprising: a curved path that communicates a rolling path and the rolling element return path; and a crowning provided at both ends of the slider-side rolling element rolling groove, the slider-side rolling element rolling groove Both ends The crowning provided on and shaped differently at one end and the other end portion.

The invention according to claim 2 is the linear guide device according to claim 1, wherein a surface of the crowning provided at the one end is in contact with the rolling element and the crowning provided at the other end. The surface in contact with the rolling element was a plane having different crowning inclination angles.
According to a third aspect of the present invention, in the linear guide device according to the first aspect, the surface of the crowning provided at the one end portion is in contact with the rolling element and the crowning provided at the other end portion. The surface in contact with the rolling element was a plane having the same crowning inclination angle but different crowning depth.

  According to a fourth aspect of the present invention, in the linear guide device according to the first aspect, a surface of the crowning provided at the one end portion that contacts the rolling element and the crowning provided at the other end portion. The surfaces that contact the rolling elements were flat surfaces having the same crowning inclination angle and the same crowning depth, and chamfers having different shapes were applied to the ends of the crownings.

According to a fifth aspect of the present invention, in the linear guide device according to the first aspect, the surface of the crowning provided at the one end is in contact with the rolling element and the crowning provided at the other end. The surface in contact with the rolling element was formed into a curved surface shape with different curvature radii.
According to a sixth aspect of the present invention, in the linear guide device according to the first aspect, the surface of the crowning provided at the one end portion is in contact with the rolling element and the crowning provided at the other end portion. The surface in contact with the rolling element was formed to have a curved shape with the same curvature radius and a different crowning depth.

Further, the invention according to claim 7 is the linear guide device according to claim 1, wherein the crowning provided on the one end portion is in contact with the rolling element and the crowning provided on the other end portion. The surfaces that contact the rolling elements were curved surfaces having the same radius of curvature, the same crowning depth, and chamfers having different shapes at the ends of the crownings.
Furthermore, the invention according to claim 8 is the linear guide device according to any one of claims 1 to 7, wherein a plurality of the rolling elements that are adjacent to each other in the endless circulation path are interposed. It has a spacer and a flexible connecting belt that connects the spacers to each other.

  According to the linear guide device of the present invention, since the crowning provided at both ends of the slider-side rolling element rolling groove has a different shape at one end and the other end, the slider is axially moved on the guide rail. When moving to one of the above, the rolling speed of a large number of rolling elements that roll in an infinite circulation path composed of a rolling element rolling path, a rolling element return path, and a direction changing path, and the other slider in the axial direction When moving back to the original position, the rolling speeds of many rolling elements that roll in the infinite circulation path are different. For this reason, the rolling element does not return to the original position of the endless circulation path even if the slider moves back in the axial direction and then returns to the original position. To go. Therefore, since the rolling element does not contact the same part of the infinite circulation path, the occurrence of fretting can be suppressed.

Further, since it is not necessary to periodically supply the fretting grease unlike the conventional apparatus, the maintenance cost can be reduced.
Furthermore, it is not necessary to perform surface treatment of rolling elements and infinite circulation path as in the conventional device, and the occurrence of fretting is suppressed only by changing the shape of the crowning provided at both ends of the slider-side rolling element rolling groove. Therefore, the manufacturing cost can be reduced.

A linear guide device according to the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view showing an embodiment of a linear guide device. FIG. 2 is a cross section of FIG. 3 is a view taken along the line III-III in FIG.
As shown in FIG. 1, the linear guide device of the present embodiment includes a guide rail 1 and a slider 2 straddling the guide rail 1.

The guide rail 1 has a rail-side rolling element rolling groove 10 formed of a substantially 1/4 arc-shaped concave groove extending in the axial direction at a ridge line portion where the upper surface and the side surface 1a intersect. A rail-side rolling element rolling groove 10 formed of a substantially semicircular concave groove extending in the axial direction is also formed at an intermediate position between both side surfaces 1 a of the guide rail 1.
The slider 2 has a portal shape and is assembled on the guide rail 1 so as to be movable in the axial direction. The slider 2 has a bearing block 2A and a pair of end caps 2B detachably attached to both ends of the bearing block 2. 2C. In addition, side seals 5 for sealing the opening of the gap between the guide rail 1 and the slider 2 are mounted on both ends of the slider 2 (end surfaces of the end caps 2B).

As shown in FIG. 2, at the corners of the inner side surfaces of the sleeve portions 6 of the bearing block 2 </ b> A, the slider-side rolling element rolling with a substantially semicircular cross section facing the rail-side rolling element rolling groove 10 of the guide rail 1. A groove 11 is formed, and a slider-side rolling element rolling groove 11 having a substantially semicircular cross section facing the rail-side rolling element rolling groove 10 of the guide rail 1 is also formed at the center of the inner surface of both sleeve portions 6. ing.
Four rolling element rolling paths 14 linearly extend between the rail-side rolling element rolling grooves 10 of the guide rail 1 and the slider-side rolling element rolling grooves 11 of both sleeve portions 6 of the bearing block 2A. These rolling element rolling paths 14 are formed in the axial direction. Also, the slider 2 has four rolling elements comprising circular through holes penetrating in the axial direction in parallel with the rolling element rolling passages 14 above and below the thick part of the sleeve 6 of the bearing block 2A. A moving body return path 13 is provided.

  The pair of end caps 2B, 2C attached to both ends of the bearing block 2A have curved direction change paths (not shown) that connect the both ends of the rolling element rolling path 14 and the rolling element return path 13, respectively. The rolling element rolling path 14, the rolling element return path 13, and the direction changing path are formed as an infinite circulation path through which a large number of rolling elements 3 circulate. When the slider 2 moves along the guide rail 1, the direction changing path sends the rolling element 3 from the rolling element rolling path 14 to the rolling element return path 13, so that a large number of rolling elements 3 are infinitely circulated. It is designed to circulate through the road.

Here, FIG. 3 is a conceptual arrow view of the III-III cross section with respect to the contact angle direction of the rail-side rolling element rolling groove 10 and the slider-side rolling element rolling groove 11 constituting the rolling element rolling path 14. In both ends of the bearing block 2A, crownings 16 and 18 are formed continuously from the slider-side rolling element rolling groove 11.
Each of the crownings 16 and 18 has a flat surface in contact with the rolling element 3. The angle formed by the plane of one crowning 16 and the imaginary line K1 along the groove bottom of the slider-side rolling element rolling groove 11 is the crowning inclination angle θ1, and the angle formed by the plane of the other crowning 18 and the imaginary line K1. Is the crowning tilt angle θ2, the crowning tilt angle θ1 is set to a small angle with respect to the crowning tilt angle θ2 (θ1 <θ2).

  Here, a large number of rolling elements 3 that circulate in an infinite circulation path composed of the rolling element rolling path 14, the rolling element return path 13, and the direction changing path are in contact with the rolling elements 3 between adjacent rolling elements 3. A separator 24 having a spherical concave surface is disposed, and a connecting belt 26 that connects adjacent separators 24 in a state where each rolling element 3 is allowed to roll is disposed. The separator 24 is made of synthetic resin, and the radius of curvature of the spherical concave surface is set larger than the radius of the rolling element 3. The connecting belt 26 is made of a flexible resin, and is an endless engagement guide groove (see FIG. 5) formed in an infinite circulation path (the rolling element rolling path 14, the rolling element return path 13, and the direction changing path). (Not shown).

According to the linear guide device having the above-described configuration, the separator 24 is disposed between the adjacent rolling elements 3 in the infinite circulation path, and the adjacent separators 24 are connected to each other by the connecting belt 24. Therefore, the continuously variable transmission circuit path A large number of the rolling elements 3 have the same rolling speed at any position on the rolling element rolling path 14, the rolling element return path 13, and the direction changing path.
The crowning 16 and 18 formed at both ends of the bearing block 2A are formed so that the surfaces that come into contact with the rolling elements 3 are different from each other in the crowning inclination angle (θ1 <θ2). , 18, the amount of revolution slip of the rolling element 3 that rolls in contact with the surface changes.

  Thus, by arranging the separator 24 and the connecting belt 24, the rolling speeds of a large number of rolling elements 3 in the endless circulation path are made the same, and the surfaces of the crowning 16, 18 formed at both ends of the bearing block 2A Since the amount of revolution slip of the rolling element 3 that rolls is changed, a large number of rolling elements 3 that roll in the infinite circulation path when the rolling element 3 in contact with one crowning 16 rolls. The rolling speed is different from the rolling speeds of a large number of rolling elements 3 that roll in the infinite circuit when the rolling element 3 in contact with the other crowning 18 rolls.

  From this, the rolling speed of a large number of rolling elements 3 rolling in the endless circulation path when the slider 2 moves in one axial direction on the guide rail 1, and the slider 2 moves in the other axial direction. The rolling speeds of a large number of rolling elements 3 that roll in an infinite circulation path when returning to the original position are different. For this reason, even if the slider 2 moves in one axial direction and then returns to the original position, the rolling element 3 does not return to the original position of the infinite circulation path. The position shifts.

Therefore, even if the slider 2 moves on one side of the guide rail 1 and then returns, the rolling element 3 does not come into contact with the same part of the infinite circulation path, so that the occurrence of fretting can be suppressed. .
Further, in the present embodiment, since it is not necessary to periodically supply the fretting grease unlike the conventional apparatus, the maintenance cost can be reduced.
Further, it is not necessary to perform surface treatment of rolling elements or an infinite circulation path as in the conventional device, and the occurrence of fretting can be suppressed only by changing the shape of the crowning 16, 18 formed at both ends of the bearing block 2A. Therefore, the manufacturing cost can be reduced.

(Second Embodiment)
Next, FIG. 4 shows a second embodiment according to the present invention. The same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals and described.
In the present embodiment, the crowning 20 and 22 are formed continuously from the slider-side rolling element rolling groove 11 at both ends of the bearing block 2A, and the crowning 20 and 22 have a surface that contacts the rolling element 3. Each is formed in a plane, and a crowning inclination angle that is an angle formed by a plane of one crowning 20 and a virtual line K1 along the groove bottom of the slider-side rolling element rolling groove 11 and a plane of the other crowning 22 and a virtual The crowning inclination angle, which is the angle formed with the line K1, is set to the same angle θ3.

  In this embodiment, the length from one end face of the bearing block 2A to the start position where one crowning 20 is formed (hereinafter referred to as the crowning depth) is L1, and the other end face of the bearing block 2A is When the length to the start position where the crowning 22 is formed (hereinafter referred to as the crowning depth) is L2, the crowning depth L1 is set longer than the crowning depth L2 (L1> L2).

According to the present embodiment, the crowning 20 and 22 formed at both ends of the bearing block 2A are planes having the same angle θ3 as the crowning inclination angle of the surfaces in contact with the rolling elements 3, and the crowning depth (L1> L2). Are formed differently, the amount of revolution slip of the rolling element 3 that rolls in contact with the surfaces of the crowning 20 and 22 changes.
Thus, by arranging the separator 24 and the connecting belt 24, the rolling speeds of a large number of rolling elements 3 in the endless circulation path are made the same, and the surfaces of the crowning 20, 22 formed at both ends of the bearing block 2A Since the amount of revolution slip of the rolling element 3 that rolls in contact with the roller changes, a large number of rolling elements 3 that roll in the infinite circulation path when the rolling element 3 that contacts one of the crowning 20 rolls. The rolling speed is different from the rolling speeds of a large number of rolling elements 3 that roll in the infinite circuit when the rolling element 3 in contact with the other crowning 22 rolls.

Therefore, even in this embodiment, even if the slider 2 moves on one side of the guide rail 1 and then returns, the rolling element 3 does not contact the same part of the infinite circulation path. In addition to being able to suppress, maintenance costs can be reduced.
Further, since the occurrence of fretting can be suppressed only by changing the shape of the crowning 20, 22 formed at both ends of the bearing block 2A, the manufacturing cost can be reduced.

(Third embodiment)
Next, FIG. 5 shows a third embodiment according to the present invention.
In the present embodiment, the crowning 30 and 32 are formed continuously from the slider-side rolling element rolling groove 11 at both ends of the bearing block 2A, and the crowning 30 and 32 have surfaces that contact the rolling element 3. The crowning inclination angle which is an angle formed by the imaginary line K1 along the plane of one crowning 30 and the groove bottom of the slider-side rolling element rolling groove 11 and the plane and imaginary line of the other crowning 32 are respectively formed on a plane. The crowning inclination angle which is an angle formed by K1 is set to the same angle θ4, and the crowning depth from one end face of the bearing block 2A to the start position where one crowning 28 is formed, and the bearing block 2A The crowning depth from the other end surface to the start position where the other crowning 30 is formed is the same length. It is set to 3.

  In this embodiment, a chamfered portion 32 is provided at the end of one crowning 28 that is continuous with one end face of the bearing block 2A, and the other crowning 30 that is continuous with the other end face of the bearing block 2A is provided. A chamfer 34 is provided at the end. The chamfered portions 32 and 34 are formed as chamfers having different shapes. For example, one of the chamfered portions 32 and 34 may be a C-shaped (for example, inclined at approximately 45 °) chamfer, and the other may be an R-shaped (rounded) chamfer. Further, both of the chamfered portions 32 and 34 may be C-shaped chamfered so that the angles of inclination are different from each other. Furthermore, both of the chamfered portions 32 and 34 may be R-shaped chamfered so that the radii of curvature differ from each other.

  According to the present embodiment, the crowning 28, 30 formed at both ends of the bearing block 2A is a plane in which the crowning inclination angle of the surface in contact with the rolling element 3 is the same angle θ4, and the crowning depth L3 is also the same. However, since the chamfered portions 32 and 34 having different shapes are formed at their end portions, the amount of revolution slip of the rolling element 3 that rolls in contact with the surfaces of the crownings 28 and 30 changes.

  Thus, by arranging the separator 24 and the connecting belt 24, the rolling speeds of the many rolling elements 3 in the endless circulation path are made the same, and the surfaces of the crowning 28, 30 formed at both ends of the bearing block 2A. Since the amount of revolution slip of the rolling element 3 that rolls in contact with the roller changes, a large number of rolling elements 3 that roll in the infinite circuit when the rolling element 3 that contacts one crowning 28 rolls are used. The rolling speed is different from the rolling speeds of a large number of rolling elements 3 that roll in the endless circulation path when the rolling element 3 in contact with the other crowning 30 rolls.

Therefore, even in this embodiment, even if the slider 2 moves on one side of the guide rail 1 and then returns, the rolling element 3 does not contact the same part of the infinite circulation path. In addition to being able to suppress, maintenance costs can be reduced.
Further, since the occurrence of fretting can be suppressed only by changing the shapes of the crownings 28 and 30 formed at both ends of the bearing block 2A, the manufacturing cost can be reduced.

(Fourth embodiment)
Next, FIG. 6 shows a fourth embodiment according to the present invention.
In this embodiment, the crowning 36, 38 is formed continuously from the slider-side rolling element rolling groove 11 at both ends of the bearing block 2A, and the surface of the one crowning 36 with which the rolling element 3 contacts is predetermined. The surface of the other crowning 38 that contacts the rolling elements 3 is formed in a curved surface shape having a predetermined curvature radius R2 that is different from the surface of the one crowning 36 ( R1 ≠ R2).

According to the present embodiment, the crownings 36 and 38 formed at both ends of the bearing block 2A are formed in curved surfaces with different curvature radii (R1 ≠ R2) on the surfaces that come into contact with the rolling elements 3. The revolution slip amount of the rolling element 3 that rolls in contact with the surfaces of the crownings 36 and 38 changes.
Thus, by arranging the separator 24 and the connecting belt 24, the rolling speeds of many rolling elements 3 in the endless circulation path are made the same, and the surfaces of the crownings 36, 38 formed at both ends of the bearing block 2A. Since the amount of revolution slip of the rolling element 3 that rolls in contact with the roller changes, a large number of rolling elements 3 that roll in the infinite circulation path when the rolling element 3 that contacts one of the crowning 36 rolls. The rolling speed is different from the rolling speeds of a large number of rolling elements 3 that roll in the infinite circuit when the rolling element 3 in contact with the other crowning 38 rolls.

Therefore, even in this embodiment, even if the slider 2 moves on one side of the guide rail 1 and then returns, the rolling element 3 does not contact the same part of the infinite circulation path. In addition to being able to suppress, maintenance costs can be reduced.
Moreover, since the occurrence of fretting can be suppressed only by changing the shapes of the crownings 36 and 38 formed at both ends of the bearing block 2A, the manufacturing cost can be reduced.

(Fifth embodiment)
Next, FIG. 7 shows a fifth embodiment according to the present invention.
In the present embodiment, the crowning 40, 42 is formed continuously from the slider-side rolling element rolling groove 11 at both ends of the bearing block 2A, and the surface of the crowning 40, 42 that the rolling element 3 contacts is It is formed with the same curvature radius R3.
The crowning depth from one end face of the bearing block 2A to the start position where one crowning 40 is formed is L4, and the crowning depth from the other end face of the bearing block 2A to the start position where the other crowning 42 is formed is set. When the depth is L5, the crowning depth L4 is set shorter than the crowning depth L5 (L4 <L5).

According to the present embodiment, the crowning 40, 42 formed at both ends of the bearing block 2A is formed with the same radius of curvature R3 on the surface with which the rolling element 3 contacts, but the crowning depth (L4 <L5) is Since they are formed differently, the revolution slip amount of the rolling element 3 that rolls in contact with the surfaces of the crowning 40, 42 changes.
Thus, by arranging the separator 24 and the connecting belt 24, the rolling speeds of a large number of rolling elements 3 in the endless circulation path are made the same, and the surfaces of the crowning 40, 42 formed at both ends of the bearing block 2A Since the amount of revolution slip of the rolling element 3 that rolls in contact with the roller changes, a large number of rolling elements 3 that roll in the infinite circulation path when the rolling element 3 that contacts one of the crowning 40 rolls. The rolling speed is different from the rolling speeds of a large number of rolling elements 3 that roll in the infinite circulation path when the rolling element 3 in contact with the other crowning 42 rolls.

Therefore, even in this embodiment, even if the slider 2 moves on one side of the guide rail 1 and then returns, the rolling element 3 does not contact the same part of the infinite circulation path. In addition to being able to suppress, maintenance costs can be reduced.
Moreover, since the occurrence of fretting can be suppressed only by changing the shape of the crowning 40, 42 formed at both ends of the bearing block 2A, the manufacturing cost can be reduced.

(Sixth embodiment)
Finally, FIG. 8 shows a sixth embodiment according to the present invention.
In the present embodiment, the crowning 44 and 46 are formed continuously from the slider-side rolling element rolling groove 11 at both ends of the bearing block 2A, and the surfaces of the crowning 44 and 46 that are in contact with the rolling element 3 are as follows. While being formed with the same radius of curvature R4, the crowning depth of one crowning 44 and the other crowning 46 is set to the same length L6.

  In the present embodiment, a chamfered portion 48 is provided at the end of one crowning 44 that is continuous with one end surface of the bearing block 2A, and the other crowning 48 that is continuous with the other end surface of the bearing block 2A is provided. A chamfered portion 50 is provided at the end. The chamfered portions 48 and 50 are formed as chamfers having different shapes. As the shape of the chamfered portions 48 and 50, as in the third embodiment, one of the chamfered portions 48 and 50 may be a C-shaped chamfer and the other may be an R-shaped chamfer. Further, both of the chamfered portions 48 and 50 may be C-shaped chamfered so that the angles of inclination are different from each other. Furthermore, both of the chamfered portions 48 and 50 may be R-shaped chamfers so that the radii of curvature are different from each other.

  According to the present embodiment, the crowning 44, 46 formed at both ends of the bearing block 2A is formed in a curved surface shape having the same curvature radius R4 in contact with the rolling elements 3, and the crowning depth L6 is also the same. However, since the chamfered portions 48 and 50 having different shapes are formed at their end portions, the amount of revolution slip of the rolling element 3 that rolls in contact with the surfaces of the crowning 44 and 46 changes.

  Thus, by arranging the separator 24 and the connecting belt 24, the rolling speeds of a large number of rolling elements 3 in the endless circulation path are made the same, and the surfaces of the crowning 44, 46 formed at both ends of the bearing block 2A Since the amount of revolution slip of the rolling element 3 that rolls in contact with the roller changes, a large number of rolling elements 3 that roll in the infinite circuit when the rolling element 3 in contact with one crowning 44 rolls. The rolling speed is different from the rolling speeds of a large number of rolling elements 3 that roll in the infinite circuit when the rolling element 3 in contact with the other crowning 46 rolls.

Therefore, even in this embodiment, even if the slider 2 moves on one side of the guide rail 1 and then returns, the rolling element 3 does not contact the same part of the infinite circulation path. In addition to being able to suppress, maintenance costs can be reduced.
Further, since the occurrence of fretting can be suppressed only by changing the shape of the crowning 44, 46 formed at both ends of the bearing block 2A, the manufacturing cost can be reduced.

It is a perspective view which shows the linear guide apparatus which concerns on this invention. It is a figure which shows the internal structure of the slider of a linear guide apparatus. It is a figure which shows the shape of the crowning of 1st Embodiment which concerns on this invention which is the III-III arrow of FIG. It is a figure which shows the shape of the crowning of 2nd Embodiment which concerns on this invention. It is a figure which shows the shape of the crowning of 3rd Embodiment which concerns on this invention. It is a figure which shows the shape of the crowning of 4th Embodiment which concerns on this invention. It is a figure which shows the shape of the crowning of 5th Embodiment which concerns on this invention. It is a figure which shows the shape of the crowning of 6th Embodiment which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Guide rail, 2 ... Slider 2, 1a ... Side surface, 2A ... Bearing block, 2B, 2C, End cap, 3 ... Rolling element, 5 ... Side seal, 10 ... Rail side rolling element rolling groove, 11 ... Slider side Rolling element rolling groove, 13 ... rolling element return path, 14 ... rolling element rolling path, 16, 18, 20, 22, 28, 30, 36, 38, 40, 42, 44, 46 ... crowning, 24 ... separator , 26 ... connecting belt, 32, 34, 48, 50 ... chamfered portion, R1, R2, R3, R4 ... radius of curvature, θ1, θ2, θ3, θ4 ... crowning inclination angle, L1, L2, L3, L4, L5 L6 ... Crowning depth

Claims (8)

A rail-side rolling element extending in the axial direction includes a guide rail having a rolling groove, and a slider supported by the guide rail so as to be movable along the axial direction, the slider being the rail-side rolling element. A slider body provided with a rolling element rolling path by forming a slider-side rolling element rolling groove facing the rolling groove, and a rolling body provided in the slider body so as to be substantially parallel to the rolling element rolling path. A moving body return path, a curved path provided on a pair of end caps attached to both ends of the slider main body in the moving direction and communicating the rolling element rolling path and the rolling element return path; and the slider-side rolling element In a linear guide device provided with a crowning provided at both ends of the rolling groove,
A linear guide device characterized in that the crowning provided at both ends of the slider-side rolling element rolling groove has different shapes at one end and the other end.   The surface that contacts the rolling element of the crowning provided at the one end portion and the surface that contacts the rolling element of the crowning provided at the other end portion are planes having different crowning inclination angles. The linear guide device according to claim 1, characterized in that:   The surface of the crowning that contacts the rolling element provided at the one end and the surface that contacts the rolling element of the crown provided at the other end have the same crowning inclination angle and the crowning depth. The linear guide device according to claim 1, wherein the planes are different planes.   The crowning inclination angle of the surface of the crowning provided at the one end portion that contacts the rolling element and the surface of the crowning provided at the other end portion that contacts the rolling element are the same, and the crowning depth is also the same. 2. The linear guide device according to claim 1, wherein the linear guide device has the same flat surface and chamfers having different shapes at the ends of the crowning.   The surface that contacts the rolling element of the crowning provided at the one end portion and the surface that contacts the rolling element of the crowning provided at the other end portion have curved surfaces with different curvature radii. The linear guide device according to claim 1, characterized in that:   The surface of the crowning that is provided at the one end is in contact with the rolling element and the surface of the crowning that is provided at the other end are in contact with the rolling element with a curved surface having the same radius of curvature. The linear guide device according to claim 1, wherein the linear guide device is formed to have different depths.   The surface contacting the rolling element of the crowning provided at the one end and the surface contacting the rolling element of the crowning provided at the other end are curved surfaces having the same curvature radius, and the crowning 2. The linear guide device according to claim 1, wherein the depth is the same, and chamfers having different shapes are applied to the ends of the crowning.   A plurality of spacers interposed between the rolling elements adjacent to each other in the endless circulation path and a flexible connecting belt for connecting the spacers to each other are provided. Item 8. The linear guide device according to any one of Items 1 to 7.

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