JP2004068880A - Linear motion device - Google Patents

Abstract

An object of the present invention is to provide a durable linear motion device which is hardly damaged even when driven at high speed.
A guide rail (1) having a rolling element rolling groove (10) extending in the axial direction on its outer surface, and a rolling element rolling groove (11) facing the rolling element rolling groove (10) of the guide rail (1) and moving in the axial direction. A slider 2 mounted on the guide rail 1 so as to be capable of rolling; a plurality of rolling elements 3 rotatably mounted in rolling element rolling paths 14 formed between the two rolling element rolling grooves 10 and 11; A rolling element return path 16 that feeds the rolling element 3 from the end point of the rolling element rolling path 14 to the starting point, at the end of the rolling element return path 16 and at the end point of the rolling element rolling path 16. A rolling element scooping portion 17 for guiding the located rolling element 3 into the rolling element return path 16 is provided, and a tip portion 17a of the rolling element scooping section 17 at which the rolling element 3 collides is perpendicular to the rolling element rolling path 14. In a plane.
[Selection] Fig. 6

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a linear motion device such as a linear motion guide device, a ball screw, a uniaxial actuator, and more particularly to a linear motion device excellent in durability.
[0002]
[Prior art]
FIG. 14 is a perspective view, FIG. 15 is a front view (however, end caps are omitted), and FIG. 15 is a cross-sectional view taken along line AA of FIG. 16 and FIG. 17 which is an enlarged front view of the rolling element scooping portion.
[0003]
This linear motion guide device includes a guide rail 101 extending in the axial direction and having a substantially rectangular cross section, and a slider 102 having a substantially U-shaped cross section attached to the guide rail 101. Both side surfaces 101a of the guide rail 101 are provided. , 101a, a total of four rows of rolling element rolling grooves 110, 110, 110, 110 are formed in the axial direction.
The slider 102 is composed of a bearing block 102A and end caps 102B, 102B attached to both ends in the axial direction. Further, both ends of the slider 102 (end faces of the end caps 102B) are provided. Side seals 105, 105 for sealing an opening of a gap between the guide rail 101 and the slider 102 are mounted.
[0004]
Further, the bearing block 102A has rolling element rolling grooves 111, 111, 111, 111 opposed to the rolling element rolling grooves 110, 110, 110, 110 of the guide rail 101 on the inner side surfaces of the both sleeves 106, 106. And a straight path 113, 113, 113, 113 penetrating the thick part of the sleeve 106, 106 in the axial direction (see FIG. 15). The rolling element rolling paths 114, 114, 114, 114 are formed from the opposing rolling element rolling grooves 110, 110, 110, 110, 111, 111, 111, 111.
[0005]
On the other hand, as shown in FIG. 16, the end caps 102B, 102B have curved paths 115 that connect the rolling element rolling paths 114 and linear paths 113 parallel to the rolling element rolling paths 114. The curved paths 115 at both ends constitute a rolling element return path 116 for feeding a rolling element 103 described later from an end point to a starting point of the rolling element rolling path 114.
[0006]
A rolling element circulation path is formed by the rolling element rolling path 114 and the rolling element return path 116, and a number of rolling elements 103 made of, for example, steel balls are loaded in the rolling element circulation path.
The slider 102 mounted on the guide rail 101 smoothly moves along the guide rail 101 through the rolling of the rolling element 103 in the rolling element rolling path 114, and during the movement, the rolling element 103 Endlessly circulates while rolling in the rolling element circulation path.
[0007]
In such a conventional linear motion guide device, the rolling element 103 is provided at the end of the rolling element return path 116 in the end cap 102B so that the rolling element 103 moves the rolling element rolling path 114 (load section). From the curved path 115 (non-load portion) and is sent to the straight path 113.
At this time, since there is a step between the tip 117a of the rolling element scooping portion 117 and the rolling element rolling groove 110, the rolling element 103 is scooped by colliding with the tip 117a of the rolling element scooping portion 117. .
[0008]
The rolling element 103 sent to the straight path 113 is returned to the rolling element rolling path 114 via the curved path 115 on the opposite side.
[0009]
[Problems to be solved by the invention]
As can be seen from FIGS. 16 and 17, since the tip 117a of the rolling element scooping portion 117 has a sharp shape, the contact area when the rolling element 103 collides is small, and thus the contact surface pressure is large. Therefore, the tip 117a may be damaged by the collision of the rolling elements 103. Such a phenomenon becomes remarkable when the linear motion guide device is driven at a high speed.
[0010]
Further, since the curved path 115 has an R shape, a centrifugal force is applied to the curved path 115 when the rolling element 103 passes through the curved path 115. Therefore, when the rolling element 103 is returned to the rolling element rolling path 114 via the curved path 115 as described above, a centrifugal force is applied to the rolling element scooping portion 117. However, as can be seen from FIG. 16, the tip 117a of the rolling element scooping portion 117 is thin and may be damaged by the centrifugal force.
[0011]
As a method of preventing such damage, a method of forming the rolling element scooping portion 117 into a shape obtained by removing a thin portion of the distal end portion 117a can be considered (see FIG. 18 which is an enlarged front view of the rolling member scooping portion, and FIG. (See FIG. 19 which is a cross-sectional view of a portion near the scooping portion.) However, as can be seen from FIG. 18, since the tip portion 117a is U-shaped and has a sharp portion, even if the above measures are taken, the contact area with the rolling element 103 does not become sufficiently large. In some cases, sufficient strength against the centrifugal force cannot be obtained.
[0012]
Also, the play space between the rolling element rolling path 114 (loading section) and the rolling element scooping section 117 is increased by the amount of removal of the thin portion of the tip section 117a (in FIG. 19, the tip section 117a The play space after removing the thin portion is denoted by S1 and the play space before the removal is denoted by S2), and the rolling element 103 greatly deviates from the original orbit and interferes with the land portion of the rolling element rolling groove 110. The rolling element 103 and the land may be damaged.
[0013]
Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a durable linear motion device which is hardly damaged even when driven at high speed.
[0014]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration. That is, the linear motion device according to claim 1 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for circulating the rolling elements by sending the rolling elements from an end point to a starting point of the rolling element rolling paths, wherein the rolling elements are disposed at an end of the rolling element return paths. A rolling element scooping section for guiding the rolling element located at the end point of the rolling path into the rolling element return path, and a tip portion of the rolling element scooping section where the rolling element collides with the rolling element rolling section; It is characterized by having a planar shape perpendicular to the road.
[0015]
The linear motion device according to claim 2 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for circulating the rolling elements by sending the rolling elements from an end point to a starting point of the rolling element rolling paths, wherein the rolling elements are disposed at an end of the rolling element return paths. A rolling element scooping section for guiding the rolling element located at the end point of the rolling path into the rolling element return path is provided, and a tip of the rolling element scooping section where the rolling element collides has a convex shape. Features.
[0016]
If the tip is flat or convex as described above, the contact area when the rolling element collides is larger than in the case where the tip has a sharp shape, and therefore, the contact surface pressure is Become smaller.
This will be described in more detail. When the rolling element collides with the tip, the tip is elastically deformed by the impact. However, when the tip has a sharp shape, the contact area after the elastic deformation is small, so that the contact surface pressure increases. Therefore, the tip may not be able to withstand the contact surface pressure and may be plastically deformed (damaged).
[0017]
On the other hand, if the tip is flat or convex as described above, the contact area after elastic deformation is larger than in the above case, so that the contact surface pressure becomes smaller. Therefore, plastic deformation (damage) hardly occurs at the tip.
Further, the linear motion device according to claim 3 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for circulating the rolling elements by sending the rolling elements from an end point to a starting point of the rolling element rolling paths, wherein the rolling elements are disposed at an end of the rolling element return paths. A rolling element scooping portion for guiding the rolling element located at the end point of the rolling path into the rolling element return path is provided, and a tip portion of the rolling element scooping section, at which the rolling element collides, has a radius of the rolling element. It is characterized by having a concave shape having the above-mentioned radius of curvature.
[0018]
If the distal end is concave, the contact area between the distal end and the rolling element is further increased, and in some cases, surface contact occurs, so that the contact surface pressure is further reduced. Therefore, plastic deformation (damage) is less likely to occur at the tip.
Further, the linear motion device according to claim 4 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for circulating the rolling elements by sending the rolling elements from an end point to a starting point of the rolling element rolling paths, wherein the rolling elements are disposed at an end of the rolling element return paths. A rolling element scooping section for guiding the rolling element located at the end point of the rolling path into the rolling element return path is provided, and a tip portion of the rolling element scooping section, at which the rolling element collides, has the tip section and the tip section. A flat surface including a tangent line of the rolling element at a contact point with the rolling element is provided.
[0019]
With such a configuration, since the rolling element collides with the plane, the contact area between the tip and the rolling element becomes larger than when the tip has a sharp shape, and the contact surface pressure is reduced. Become. Therefore, plastic deformation (damage) hardly occurs at the tip.
Further, the linear motion device according to claim 5 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for circulating the rolling elements by sending the rolling elements from an end point to a starting point of the rolling element rolling paths, wherein the rolling elements are disposed at an end of the rolling element return paths. A rolling element scooping section for guiding the rolling element located at the end point of the rolling path into the rolling element return path; and providing a leading end portion of the rolling element scooping section where the rolling element collides with the rolling element track. It is characterized in that it is arranged without a step on any one of the surfaces.
[0020]
With such a configuration, the rolling element can be scooped up substantially along the trajectory of the rolling element (tangential scooping), so that the contact surface pressure generated at the time of collision between the tip and the rolling element can be extremely reduced. Therefore, it is possible to prevent the distal end from being damaged.
In addition, since the play space between the rolling element rolling path (loading portion) and the rolling element scooping portion can be reduced, the rolling element largely deviates from the original track and interferes with the land portion of the rolling element rolling groove. Can be prevented. Therefore, it is possible to prevent the rolling elements and the land from being damaged.
[0021]
Further, the linear motion device according to claim 6 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for circulating the rolling elements by sending the rolling elements from an end point to a starting point of the rolling element rolling paths, wherein the rolling elements are disposed at an end of the rolling element return paths. A rolling element scooping section for guiding the rolling element located at the end point of the rolling path into the rolling element return path; a tip end of the rolling element scooping section where the rolling element collides; and a rolling element return path. Are connected by a straight path.
[0022]
Since the path connecting the leading end and the end of the rolling element return path is not an R shape but a straight line, the centrifugal force generated when the rolling element passes through the path is extremely small. Therefore, the centrifugal force applied to the tip is reduced, and the tip is less likely to be damaged.
In addition, since the play space between the rolling element rolling path (loading portion) and the rolling element scooping portion can be reduced, the rolling element largely deviates from the original track and interferes with the land portion of the rolling element rolling groove. Can be prevented. Therefore, it is possible to prevent the rolling elements and the land from being damaged.
[0023]
Further, the linear motion device according to claim 7 of the present invention has a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, A movable member supported by the guide member so as to be movable in the axial direction through the rolling of a plurality of rolling elements disposed in a rolling element rolling path formed between both rolling element raceway surfaces; A rolling element return path for feeding rolling elements from an end point to a starting point of the rolling element rolling path and circulating the rolling elements, wherein the end of the rolling element return path includes the rolling element. A rolling element scooping portion for guiding the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided, and a tip portion of the rolling element scooping section, at which the rolling element collides, is the rolling element. A flat shape that is perpendicular to the moving body rolling path, a convex shape, or a radius of curvature equal to or greater than the radius of the rolling body To a concave, further, the following (A), (B), and satisfies at least one of the three conditions of (C).
[0024]
(A) The tip has a plane including a tangent of the rolling element at a contact point between the tip and the rolling element.
(B) The tip is disposed without a step on one of the raceway surfaces of the two rolling elements.
(C) The front end and the end of the rolling element return path are connected by a straight path.
[0025]
With such a configuration, it is possible to prevent the tip of the rolling element scooping portion, the rolling element, and the land from being damaged.
Note that examples of the rolling device in the present invention include a linear motion guide device, a ball screw, and a uniaxial actuator.
In the present invention, the guide member means a guide rail when the linear motion device is a linear motion guide device, and a screw shaft when the linear motion device is a ball screw. In the present invention, the movable member means a slider when the linear motion device is a linear motion guide device, and a nut when the linear motion device is a ball screw.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a linear motion device according to the present invention will be described in detail with reference to the drawings. Note that the present embodiment is an example of the present invention, and the present invention is not limited to the present embodiment.
FIG. 1 is a perspective view showing a linear motion guide device which is an embodiment of a linear motion device according to the present invention. 2 is a front view of the linear motion guide device of FIG. 1 viewed from the axial direction (however, the end cap is omitted). FIG. 3 is a cross-sectional view taken along line AA of FIG. FIG. FIG. 4 is a perspective view of the end cap.
[0027]
First, the configuration of the linear motion guide device of the present embodiment will be described. A slider 2 having a substantially U-shaped cross section is mounted on a guide rail 1 having a substantially rectangular cross section extending in the axial direction so as to be movable in the axial direction.
Rolling element rolling grooves 10, formed of concave grooves having a substantially arc-shaped cross section extending in the axial direction, are formed at ridges where the upper surface of the guide rail 1 intersects the side surfaces 1 a, 1 a. Rolling member rolling grooves 10, which are formed in concave portions having a substantially semicircular cross section and extending in the axial direction, are formed at intermediate positions between both side surfaces 1 a, 1 a of the guide rail 1.
[0028]
The slider 2 is composed of a bearing block 2A forming the main body of the slider 2 and end caps 2B, 2B detachably attached to both ends in the axial direction. Side seals 5 and 5 for sealing the opening of the gap between the guide rail 1 and the slider 2 are attached to each end cap 2B).
[0029]
Further, rolling element rolling grooves 11, 11 having a substantially semicircular cross section facing the rolling element rolling grooves 10, 10 of the guide rail 1 are provided at the corners on the inner side surfaces of both sleeves 6, 6 of the bearing block 2 </ b> A. At the center of the inner side surface of both sleeves 6, 6, rolling element rolling grooves 11, 11 having a substantially semicircular cross section facing the rolling element rolling grooves 10, 10 of the guide rail 1 are formed. I have.
[0030]
The rolling element rolling grooves 10, 10, 10, 10 of the guide rail 1 and the rolling element rolling grooves 11, 11, 11, 11 of both sleeve portions 6, 6 form rolling element rolling paths having a substantially circular cross section. 14, 14, 14, 14 are formed, and these rolling element rolling paths 14 extend in the axial direction. The rolling element rolling grooves 10 and 11 correspond to rolling element raceway surfaces which are constituent elements of the present invention. Further, the number of rolling element rolling grooves 10 and 11 provided in the guide rail 1 and the slider 2 is not limited to two rows on one side, but may be one row on one side or three or more rows on one side.
[0031]
Further, the slider 2 has straight lines formed in the upper and lower portions of the thick portions of the sleeve portions 6 and 6 of the bearing block 2A in parallel with the rolling element rolling paths 14 and having circular cross-sectional through holes penetrating in the axial direction. It has a path 13,13,13,13.
On the other hand, as shown in FIGS. 3 and 4, the end caps 2B, 2B having a substantially U-shaped cross section are provided on the contact surface (rear surface) with the bearing block 2A on the rolling element rolling path 14 and a straight line parallel thereto. A semi-doughnut-shaped curved path 15 that communicates with the path 13 is provided. The linear path 13 and the curved paths 15 at both ends form a rolling element 3 to be described later at an end point of the rolling element rolling path 14. The rolling element return path 16 which is sent from the to the starting point.
[0032]
A substantially annular rolling element circulation path is formed by the rolling element rolling path 14 and the rolling element return path 16, and a number of rolling elements 3 made of, for example, steel balls are loaded in the rolling element circulation path. ing.
When the slider 2 mounted on the guide rail 1 is moved in the axial direction along the guide rail 1, the rolling elements 3 loaded in the rolling element rolling paths 14 roll in the rolling element rolling paths 14. It moves in the same direction as the slider 2 with respect to the guide rail 1 while moving. When the rolling element 3 reaches the end point of the rolling element rolling path 14, the rolling element 3 collides with the tip end portion 17 a of the rolling element scooping section 17 provided at the end of the rolling element return path 16, thereby causing the rolling element rolling path 14. And is sent to the curved path 15.
[0033]
The rolling element 3 that has entered the curved path 15 makes a U-turn by the curved path 15 and is introduced into the straight path 13, and reaches the opposite curved path 15 through the straight path 13. Here, a U-turn is performed again to return to the rolling element rolling path 14, and such circulation in the rolling element circulation path is repeated indefinitely.
Next, the rolling element scooping portion 17 will be described.
[0034]
In the linear motion guide device of the present embodiment, the distal end portion 17a of the rolling element scooping portion 17 has a planar shape perpendicular to the rolling element rolling path 14. That is, as shown in FIG. 5 which is an enlarged front view of the rolling element scooping portion 17 and FIG. 6 which is an enlarged sectional view of a portion near the rolling element scooping portion 17, the rolling element scooping portion 17 is It has a vertical plane 21.
[0035]
The rolling element 3 that has reached the end point of the rolling element rolling path 14 is scooped up by colliding with the tip 17a of the rolling element scooping portion 17, but since the tip 17a of the rolling element scooping portion 17 is planar, The contact area when the rolling element 3 collides is larger than when the tip portion 17a has a sharp shape. Therefore, since the contact surface pressure is reduced, the tip portion 17a is less likely to be damaged.
[0036]
The tip 17a of the rolling element scooping portion 17 may have a convex shape. That is, as shown in FIG. 7, if the rolling element scooping portion 17 has the convex surface 22, the same effect as in the case of having the above-described flat surface 21 can be obtained.
Further, the tip portion 17a of the rolling element scooping portion 17 may have a concave shape having a radius of curvature equal to or larger than the radius of the rolling element 3. That is, as shown in FIGS. 8 and 9, if the rolling element scooping portion 17 has the concave surface 23, the same effect as in the case of having the flat surface 21 described above can be obtained. In the case where the rolling element scooping portion 17 and the concave surface 23 are in surface contact, the above-mentioned effect is more excellent. .
[0037]
Further, as shown in FIG. 10, a flat surface 24 including a tangent line of the rolling element 3 at a contact point between the tip section 17a and the rolling element 3 may be provided at the tip 17a of the rolling element scooping portion 17. Then, since the rolling element 3 collides with the plane 24, the same effect as in the case where the plane 21 is provided can be obtained.
Furthermore, as shown in FIG. 11, it is preferable that the tip end portion 17a of the rolling element scooping portion 17 is disposed on the rolling element raceway surface 10 without any step. Then, the rolling element 3 can be scooped up substantially along the trajectory of the rolling element 3 (tangential scooping), so that the contact surface pressure generated at the time of collision between the tip portion 17a and the rolling element 3 can be extremely reduced. Therefore, the tip portion 17a can be prevented from being damaged.
[0038]
In addition, since the play space between the rolling element rolling path 14 (load portion) and the rolling element scooping portion 17 can be reduced, the rolling element 3 largely deviates from the original orbit and the rolling element rolling groove 10 is formed. Interference with a land (not shown) can be prevented. Therefore, it is possible to prevent the rolling element 3 and the land from being damaged.
Furthermore, as shown in FIG. 12, the tip 17 a of the rolling element scooping portion 17 and the end of the rolling element return path 16 (curved path 15) may be connected by a straight passage 25. Since the passage 25 connecting the front end 17a and the end of the rolling element return path 16 is not an R shape but a straight line, the centrifugal force generated when the rolling element 3 passes through the passage 25 is extremely small. Therefore, the centrifugal force applied to the tip 17a is reduced, and the tip 17a is hardly damaged.
[0039]
In addition, the play space between the rolling element rolling path 14 (load portion) and the rolling element scooping portion 17 is reduced by the amount of S shown in FIG. 12 as compared with the case where the passage 25 has an R shape. Therefore, it is possible to prevent the rolling elements 3 from largely deviating from the original trajectory and interfering with the lands (not shown) of the rolling element rolling grooves 10. Therefore, it is possible to prevent the rolling element 3 and the land from being damaged.
[0040]
The shape and arrangement of the distal end portion 17a as described above may be employed in combination of two or more. One example is shown in FIG. In this example, both the convex surface 22 and the plane 24 including the tangent line of the rolling element 3 at the contact point between the distal end portion 17a and the rolling element 3 are provided at the distal end portion 17a of the rolling element scooping portion 17. Further, the tip 17a of the rolling element scooping portion 17 and the end of the rolling element return path 16 (curved path 15) are connected by a straight path 25.
[0041]
【The invention's effect】
As described above, the linear motion device of the present invention is hardly damaged even when driven at high speed, and has excellent durability.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a linear motion guide device which is an embodiment of a linear motion device according to the present invention.
FIG. 2 is a front view of the linear motion guide device of FIG. 1 as viewed from an axial direction.
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a perspective view of an end cap.
FIG. 5 is an enlarged front view of a rolling element scooping portion.
FIG. 6 is an enlarged sectional view of a portion near a rolling element scooping portion.
FIG. 7 is an enlarged cross-sectional view of a portion near a rolling element scooping portion in a linear motion guide device according to a modification of the present embodiment.
FIG. 8 is an enlarged front view of a rolling element scooping portion in a linear motion guide device which is another modification of the present embodiment.
FIG. 9 is an enlarged front view of a rolling element scooping portion in a linear motion guide device which is another modification of the present embodiment.
FIG. 10 is an enlarged sectional view of a portion near a rolling element scooping portion in a linear motion guide device which is another modification of the present embodiment.
FIG. 11 is an enlarged sectional view of a portion near a rolling element scooping portion in a linear motion guide device which is another modification of the present embodiment.
FIG. 12 is an enlarged sectional view of a portion near a rolling element scooping portion in a linear motion guide device which is another modification of the present embodiment.
FIG. 13 is an enlarged sectional view of a portion near a rolling element scooping portion in a linear motion guide device which is another modification of the present embodiment.
FIG. 14 is a perspective view showing a configuration of a conventional linear guide device.
FIG. 15 is a front view of the linear motion guide device of FIG. 14 as viewed from an axial direction.
16 is a sectional view taken along line AA of FIG.
FIG. 17 is an enlarged front view of a rolling element scooping-up section in a conventional linear motion guide device.
FIG. 18 is an enlarged front view of a rolling element scooping-up section in a conventional linear motion guide device.
FIG. 19 is an enlarged cross-sectional view of a portion near a rolling element scooping portion in a conventional linear guide device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide rail 2 Slider 2A Bearing block 2B End cap 3 Rolling element 10 Rolling element rolling groove 11 Rolling element rolling groove 13 Linear path 14 Rolling element rolling path 15 Curved path 16 Rolling element return path 17 Rolling element pick-up part 17a Tip 21 Plane 22 perpendicular to rolling element rolling path 22 Convex surface 23 Concave surface 24 Plane 25 including the tangent of the rolling element at the point of contact between the tip and the rolling element 25 Linear path

Claims (7)

A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping section for guiding the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided, and the rolling element scooping section includes the rolling element scooping section. A linear motion device characterized in that a tip end portion against which a moving body collides has a planar shape perpendicular to the rolling element rolling path. A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping section for guiding the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided, and the rolling element scooping section includes the rolling element scooping section. A linear motion device characterized in that a tip portion against which a moving body collides has a convex shape. A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping section for guiding the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided, and the rolling element scooping section includes the rolling element scooping section. A linear motion device characterized in that a tip end portion against which a moving body collides has a concave shape having a radius of curvature equal to or larger than the radius of the rolling element. A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping portion that guides the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided,
A linear motion device, wherein a flat surface including a tangent line of the rolling element at a contact point between the tip and the rolling element is provided at a tip of the rolling element scooping portion where the rolling element collides. A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping portion that guides the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided,
A linear motion device, wherein a tip end of the rolling element picking-up portion, at which the rolling element collides, is disposed without a step on one of the two rolling element raceway surfaces. A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping portion that guides the rolling element located at the end point of the rolling element rolling path into the rolling element return path is provided,
A linear motion device, wherein a tip end of the rolling element picking-up portion where the rolling element collides and an end of the rolling element return path are connected by a straight path. A rolling member having a guide member having a rolling element raceway surface and extending in the axial direction, and a rolling element raceway surface facing the rolling element raceway surface of the guide member, and a rolling element rolling formed between the two rolling element raceway surfaces; A movable member supported by the guide member movably in the axial direction through the rolling of a plurality of rolling elements disposed in the path, and feeding the rolling element from an end point to a start point of the rolling element rolling path. A rolling element return path for circulating the rolling elements,
At the end of the rolling element return path, a rolling element scooping portion that guides the rolling element positioned at the end point of the rolling element rolling path into the rolling element return path is provided,
The tip of the rolling element pick-up portion where the rolling element collides is a flat surface that is perpendicular to the rolling element rolling path, a convex shape, or a concave shape having a radius of curvature equal to or larger than the radius of the rolling element,
Further, a linear motion device which satisfies at least one of the following three conditions (A), (B) and (C).
(A) The tip has a plane including a tangent of the rolling element at a contact point between the tip and the rolling element.
(B) The tip is disposed without a step on one of the raceway surfaces of the two rolling elements.
(C) The front end and the end of the rolling element return path are connected by a straight path.

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