JP2024027844A - Linear guide unit - Google Patents

Abstract

The present invention provides a linear motion guide unit that can ensure smooth sliding of a slider.
A linear motion guide unit includes a rail, a slider, and a roller. The slider includes a casing and a holding member that holds the roller to the casing. The holding member includes a holding plate and an attachment mechanism for attaching the holding plate to the casing side. The holding plate includes a first tongue-like part that includes a part of the second guide surface, the longitudinal end side of the holding plate is a first fixed end, and the longitudinal center side of the holding plate is a first free end. , a second tongue-shaped portion including a part of the second guide surface, a second fixed end on the longitudinal center side of the holding plate, and a second free end on the longitudinal end side of the holding plate. ing. The first tongue portion includes a first raised portion provided on the second guide surface so as to swell toward the first guide surface. The second tongue portion includes a second raised portion provided on the second guide surface so as to swell toward the first guide surface.
[Selection diagram] Figure 6

Description

The present disclosure relates to a linear motion guide unit.

A linear motion guide unit including rollers as rolling elements is known (for example, see Patent Document 1). The linear motion guide unit disclosed in Patent Document 1 includes a track rail, a slider that moves relative to the track rail, and a holding plate that holds the rollers on the slider.

JP 2021-134903 Publication

In the linear motion guide unit disclosed in Patent Document 1, the slider includes a casing including a return path along which the roller moves, and a pair of end caps each including a direction change path for changing the direction of the roller. The rollers circulate in a circulation path that includes a return path, a direction change path, and a track path.

Here, in the linear guide unit, if the rollers enter the trackway in an inclined state, the rollers rolling on the track surface cannot roll properly. As a result, there is a risk that the sliding resistance of the slider will increase and heat will be generated. When the roller enters the track path, it is required to properly correct and guide the roller to ensure smooth sliding of the slider.

Therefore, one of the objects is to provide a linear motion guide unit that can ensure smooth sliding of a slider.

A linear guide unit according to the present disclosure includes a rail having a first track surface extending in the longitudinal direction, a slider that is attached to the rail so as to be relatively movable and has a second track surface facing the first track surface, and a slider having a second track surface facing the first track surface. It is provided with rollers as a plurality of rolling elements that roll on a track path composed of a first raceway surface and a second raceway surface. The slider includes a casing, which is provided with a first circulation path parallel to the raceway, and includes a first guide surface and a second raceway surface that guide the roller by contacting a first end surface located on one side of the roller. It includes an end cap that is disposed on one side in the longitudinal direction and is provided with a second circulation path that connects the trackway and the first circulation path, and a holding member that holds the roller in the casing. Each roller circulates in an annular path constituted by a track path, a first circulation path, and a second circulation path. The holding member includes a holding plate having a shape extending in the longitudinal direction and having a second guide surface that guides the roller by contacting a second end face located on the other side of the roller, and an attachment mechanism for attaching the holding plate to the casing side. and, including. The holding plate includes a first tongue-like part that includes a part of the second guide surface, the longitudinal end side of the holding plate is a first fixed end, and the longitudinal center side of the holding plate is a first free end. , a second tongue-shaped portion including a part of the second guide surface, a second fixed end on the longitudinal center side of the holding plate, and a second free end on the longitudinal end side of the holding plate. ing. The first tongue portion includes a first raised portion provided on the second guide surface so as to swell toward the first guide surface. The second tongue portion includes a second raised portion provided on the second guide surface so as to swell toward the first guide surface.

According to the linear motion guide unit, smooth sliding of the slider can be ensured.

FIG. 1 is a schematic perspective view showing a linear motion guide unit in Embodiment 1 of the present disclosure. FIG. 2 is a schematic cross-sectional view taken along the cross section indicated by arrow II-II in FIG. FIG. 3 is an enlarged front view showing a region including a holding plate of a slider, which will be described later, included in the linear guide unit shown in FIG. FIG. 4 is a schematic sectional view showing a part of the slider included in the linear motion guide unit shown in FIG. FIG. 5 is a schematic perspective view of the holding plate. FIG. 6 is an enlarged view of the area indicated by VI in FIG. FIG. 7 is an exploded perspective view of the holding member including the holding plate. FIG. 8 is a schematic side view of the retainer plate. FIG. 9 is a schematic side view of the retainer plate. FIG. 10 is a schematic cross-sectional view of the holding plate. FIG. 11 is an enlarged view schematically showing the periphery of the first tongue portion and the second tongue portion of the retaining plate. FIG. 12 is an enlarged view schematically showing the periphery of the first tongue portion and the second tongue portion of the retaining plate.

[Overview of embodiment]
The linear guide unit of the present disclosure includes a rail having a first track surface extending in the longitudinal direction, a slider that is attached to the rail so as to be relatively movable and has a second track surface facing the first track surface, and a slider having a second track surface facing the first track surface. It is provided with rollers as a plurality of rolling elements that roll on a raceway formed of a surface and a second raceway surface. The slider includes a casing, which is provided with a first circulation path parallel to the raceway, and includes a first guide surface and a second raceway surface that guide the roller by contacting a first end surface located on one side of the roller. It includes an end cap that is disposed on one side in the longitudinal direction and is provided with a second circulation path that connects the trackway and the first circulation path, and a holding member that holds the roller in the casing. Each roller circulates in an annular path constituted by a track path, a first circulation path, and a second circulation path. The holding member includes a holding plate having a shape extending in the longitudinal direction and having a second guide surface that guides the roller by contacting a second end face located on the other side of the roller, and an attachment mechanism for attaching the holding plate to the casing side. and, including. The holding plate includes a first tongue-shaped part that includes a part of the second guide surface, the end side in the longitudinal direction becomes the first fixed end, and the center side in the longitudinal direction becomes the first free end; A second tongue-like portion is provided, including a part of the tongue, a second fixed end on the center side in the longitudinal direction, and a second free end on the end side in the longitudinal direction. The first tongue portion includes a first raised portion provided on the second guide surface so as to swell toward the first guide surface. The second tongue portion includes a second raised portion provided on the second guide surface so as to swell toward the first guide surface.

The present inventors discovered that when the roller moves from a direction change path, which is a no-load area where no load is applied to the roller, to a track path, which is a loaded area where a load is applied to the roller, the attitude of the roller is tilted, resulting in roller skew. As a result, we focused on the fact that this may lead to an increase in the sliding resistance of the slider and heat generation. After careful consideration, we came up with the following configuration. That is, by properly pressing the end face of the roller on the second guide surface included in the holding plate of the holding member to correct the posture of the roller and enter it into the trackway, the posture of the roller in the trackway is corrected. I thought about it.

According to the linear motion guide unit of the present disclosure, the holding plate is provided with the first tongue portion having the above configuration. In this case, the roller enters the load area from the first fixed end side of the first tongue portion. Since the first tongue portion includes the first raised portion, the roller can be moved while pressing the roller toward the first guide surface due to elastic deformation of the first tongue portion. Here, in the first tongue portion, the roller moves from the first fixed end side to the first free end side, but the pressing force of the roller due to elastic deformation decreases as it moves toward the first free end side. turn into. According to the linear motion guide unit of the present disclosure, the holding plate is provided with the second tongue-shaped portion having the above configuration. In the second tongue, in the longitudinal direction, opposite to the first tongue, the no-load region side becomes the second free end, and the load region side becomes the second fixed end. Since the second tongue portion includes the second raised portion, the roller can be moved while pressing the roller toward the first guide surface due to elastic deformation of the second tongue portion. In this case, the roller moves toward the second fixed end of the second tongue, that is, toward the base of the second tongue. Then, even in the area where the pressing force is small in the first tongue part, the second tongue part, which has a high pressing force on the roller due to elastic deformation, moves the roller while strongly pressing the roller against the first guide surface side. be able to. Therefore, when the roller moves toward the center in the longitudinal direction, it is possible to appropriately correct the posture of the roller and guide it. As a result, it is possible to suppress the occurrence of skew in the track path and ensure smooth sliding of the slider. Note that such a linear guide unit can press the roller widely in the longitudinal direction, so it is effectively used when the diameter of the roller is relatively large.

In the above-mentioned linear motion guide unit, the first tongue portion and the second tongue portion may be provided in pairs at intervals in the longitudinal direction. By doing so, smooth sliding of the slider can be ensured on both sides of the linear motion guide unit in the longitudinal direction.

In the linear motion guide unit, the first tongue portion and the second tongue portion may be spaced apart from each other in the direction of the rotational axis of the roller rolling on the first guide surface and the second guide surface. . By doing so, the region where the first tongue portion is located and the region where the second tongue portion is located can be overlapped in the longitudinal direction of the retainer plate. In this case, the roller can be moved without interrupting the pressing force on the roller by the first tongue and second tongue, each of which is elastically deformed. Therefore, the occurrence of skew can be more reliably suppressed, and smooth sliding of the slider can be more reliably ensured.

In the above linear guide unit, a gap may be provided around the first tongue portion and the second tongue portion, except for a region where the first fixed end and the second fixed end are located. By doing so, when the first tongue and the second tongue are elastically deformed from each fixed end, the other parts of the holding plate, that is, the first tongue and the second tongue, are deformed elastically. It is possible to greatly reduce the possibility that the portion where the portion is not provided will interfere with the first tongue portion and the second tongue portion. Therefore, it is possible to more reliably suppress the occurrence of skew and ensure smooth sliding of the slider.

In the above linear guide unit, the length of the second tongue in the longitudinal direction may be longer than the length of the first tongue in the longitudinal direction. By doing this, the elastic deformation of the second tongue portion is made appropriate so that the second fixed end is on the center side in the longitudinal direction and the second free end is on the end side in the longitudinal direction. This allows the rollers to move more smoothly. Therefore, smooth sliding of the slider can be ensured more reliably.

In the linear motion guide unit, the position of the most protruding region of the first raised portion and the position of the most protruded region of the second raised portion may overlap in the longitudinal direction. By doing so, the pressing of the roller by the first raised portion included in the first tongue portion and the pressing of the roller by the second raised portion included in the second tongue portion can be overlapped in the longitudinal direction. This reduces the amount of deflection of the first tongue 61a and the second tongue 62a, which have different fulcrum points, and even if one of the protruding areas moves away from the roller, the protruding area on the other side will not bend the roller. can be pressed. Therefore, by pressing the roller by the first tongue portion and pressing the roller by the second tongue portion, it is possible to more reliably correct the posture of the roller and suppress the occurrence of skew. As a result, smooth sliding of the slider can be ensured more reliably.

[Specific example of embodiment]
Next, an example of a specific embodiment of the linear motion guide unit of the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numerals and their descriptions will not be repeated.

(Embodiment 1)
First, Embodiment 1, which is an embodiment of the present disclosure, will be described. FIG. 1 is a schematic perspective view showing a linear motion guide unit in Embodiment 1 of the present disclosure. FIG. 2 is a schematic cross-sectional view taken along the cross section indicated by arrow II-II in FIG. In FIG. 1 and the figures shown below, the X direction indicates the width direction of the linear motion guide unit, the Y direction indicates the longitudinal direction of the linear motion guide unit, and the Z direction indicates the linear motion guide unit. The thickness direction (height direction) of the guide unit is shown. The X direction, Y direction, and Z direction are each orthogonal to each other. FIG. 2 is a cross-sectional view taken along a plane perpendicular to the Y direction, that is, the XZ plane. FIG. 3 is an enlarged front view showing a region including a retaining plate of a slider, which will be described later, included in the linear guide unit shown in FIG. FIG. 4 is a schematic sectional view showing a part of the slider included in the linear motion guide unit shown in FIG.

1 to 4, a linear motion guide unit 10a according to Embodiment 1 of the present disclosure includes a rail 11a as a track rail, a slider 21a, and a plurality of rollers 20a, 20b, 20c as rolling elements. , 20d. The rail 11a is configured to extend straight in the Y direction, which is the longitudinal direction. By including a plurality of rollers 20a, 20b, 20c, and 20d as rolling elements, the linear motion guide unit 10a according to the first embodiment has a smaller size and a higher rating than a case where the rolling elements are balls, for example. The load can be increased. In this embodiment, the linear motion guide unit 10a is a so-called four-row linear motion guide unit. Note that the rollers 20a and 20b each have rolling surfaces 28a and 28b, first end surfaces 51a and 51b located on one side in the direction of the rotational axis of the rollers 20a and 20b, and a second end face 51a and 51b located on the other side in the direction of the rotational axis. end faces 52a and 52b. Similarly, the rollers 20c and 20d include a rolling surface, a first end surface located on one side of the rotational axis direction of the rollers 20c and 20d, and a second end surface located on the other side of the rotational axis direction.

First, the configuration of the rail 11a will be explained. The rail 11a includes a rail upper end surface 12a and a rail lower end surface 12b that are spaced apart in the Z direction, a first rail side surface 13a and a second rail side surface 13b that are spaced apart in the It includes a rail front end surface 14a and a rail rear end surface 14b that are spaced apart from each other. That is, the rail 11a includes a first rail side surface 13a and a second rail side surface 13b each extending in parallel along the longitudinal direction. The rail 11a has a pair of first raceway grooves 15a, 15b extending parallel to each other in the longitudinal direction. The first raceway groove 15a is provided on the first rail side surface 13a. The first raceway groove 15b is provided on the second rail side surface 13b. Note that, for example, 53 mm is selected as the width of the rail 11a.

The first raceway groove 15a includes first raceway surfaces 16a, 16b and a side wall surface 17a. The first track surface 16a is inclined with respect to the XY plane and is provided on the rail upper end surface 12a side. The first track surface 16b is inclined with respect to the XY plane and is provided on the rail lower end surface 12b side. The side wall surface 17a is provided continuously to each of the first raceway surface 16a and the first raceway surface 16b. Like the first raceway groove 15a, the first raceway groove 15b also includes first raceway surfaces 16c, 16d and a side wall surface 17b. The first track surface 16c is inclined with respect to the XY plane and is provided on the rail upper end surface 12a side. The first track surface 16d is inclined with respect to the XY plane and is provided on the rail lower end surface 12b side. The side wall surface 17b is provided continuously to each of the first raceway surface 16c and the first raceway surface 16d. That is, the rail 11a includes first track surfaces 16a, 16b, 16c, and 16d extending in the longitudinal direction. A linear motion guide unit 10a including such a rail 11a is suitably used in a machine tool, an assembly device, a conveyance machine, etc.

The rail 11a is provided with a plurality of through holes 18 that penetrate in the Z direction from the rail upper end surface 12a to the rail lower end surface 12b. The plurality of through holes 18 are provided at intervals in the Y direction. The through holes 18 are effectively utilized, for example, when the rail 11a is attached to a predetermined location when the linear motion guide unit 10a is used.

Next, the configuration of the slider 21a will be explained. The slider 21a is attached to the rail 11a so as to be relatively movable. In this embodiment, the slider 21a is slidably straddled over the rail 11a. The slider 21a is provided with a recess 24a recessed in the Z direction, and the rail 11a is fitted into the recess 24a. That is, the slider 21a is attached so as to straddle the rail 11a, and is configured to be movable in the Y direction.

The slider 21a holds a casing 22a, a pair of end caps 23a and 23b, specifically a first end cap 23a, a second end cap 23b, and rollers 20a, 20b, 20c, and 20d in the casing 22a. holding members 41a and 41b. The configuration of the holding members 41a and 41b will be detailed later. The first end cap 23a is arranged on one side in the longitudinal direction of the casing 22a, specifically, on the rail front end surface 14a side of the casing 22a in the longitudinal direction. The second end cap 23b is arranged on the other side in the longitudinal direction of the casing 22a, specifically, on the rail rear end surface 14b side of the casing 22a in the longitudinal direction. That is, the slider 21a includes a pair of end caps 23a and 23b arranged on both sides of the casing 22a in the longitudinal direction. The first end cap 23a is provided with a through hole penetrating in the Y direction. Both the first end cap 23a and the second end cap 23b have a so-called plate shape with the longitudinal direction being the thickness direction. The first end cap 23a is connected to the casing 22a by a plurality of bolts using a through hole. The second end cap 23b is connected to the casing 22a by a plurality of bolts using a through hole. Further, the end cap 23a is provided with a supply hole (not shown) for supplying lubricating oil. The same applies to the end cap 23b.

Note that the slider 21a includes an end seal 27a disposed on one side of the first end cap 23a in the longitudinal direction, and a lubricating member (not shown) that applies lubricating oil. The end seal 27a and the lubricating member are attached to the first end cap 23a with bolts. Like the first end cap 23a, the second end cap 23b is connected to the casing 22a with an end seal 27b and a lubricating member by a plurality of bolts. Note that the casing 22a is provided with a plurality of attachment holes 29 recessed in the Z direction. Nine mounting holes 29 are provided in this embodiment. The nine attachment holes 29 are provided at intervals in the X direction and the Y direction, respectively, and are used, for example, when connecting the slider 21a and other members.

The casing 22a includes second raceway surfaces 32a, 32b, 32c, and 32d facing the first raceway surfaces 16a, 16b, 16c, and 16d, respectively. The track path 31a on which the roller 20a rolls is composed of a first track surface 16a and a second track surface 32a. The track path 31b on which the roller 20b rolls is composed of a first track surface 16b and a second track surface 32b. The track path 31c on which the roller 20c rolls is composed of a first track surface 16c and a second track surface 32d. The track path 31d on which the roller 20d rolls is composed of a first track surface 16d and a second track surface 32d.

The casing 22a is provided with first circulation paths 33a, 33b, 33c, and 33d that are parallel to the track paths 31a, 31b, 31c, and 31d, respectively. The first circulation paths 33a, 33b, 33c, and 33d are also called return paths. A hollow cylindrical sleeve 34a formed by combining a first divided member 35a and a second divided member 36a is disposed within the first circulation path 33a. A plurality of rollers 20a move within the sleeve 34a. Similarly, a hollow cylindrical sleeve 34b formed by combining the first divided member 35b and the second divided member 36b is arranged in the first circulation path 33b. A hollow cylindrical sleeve 34c formed by combining a first divided member 35c and a second divided member 36c is disposed within the first circulation path 33c. A hollow cylindrical sleeve 34d formed by combining the first divided member 35d and the second divided member 36d is disposed within the first circulation path 33d.

The casing 22a has first guide surfaces 39a, 39b, 39c that guide the rollers 20a, 20b, 20c, 20d by contacting the first end surfaces 51a, 51b located on one side of the rollers 20a, 20b, 20c, 20d. , 39d.

A second circulation path 37a is provided in the first end cap 23a (see especially FIG. 4). The second circulation path 37a is also called a direction change path. The second circulation path 37a has an arcuate concave shape in the thickness direction (Y direction) of the first end cap 23a so that the plurality of rollers 20a can be moved. Furthermore, a spacer 30a is used to make the second circulation path 37a arcuate. The second circulation path 37a connects the orbital path 31a and the first circulation path 33a. Note that the first end cap 23a has a second circulation path connecting the trackway 31b and the first circulation path 33b, a second circulation path connecting the trackway 31c and the first circulation path 33c, and a track. A second circulation path connecting the path 31d and the first circulation path 33d is included. Also, like the first end cap 23a, the second end cap 23b connects the second circulation path that connects the trackway 31a and the first circulation path 33a, and the second circulation path that connects the trackway 31b and the first circulation path 33b. It includes a second circulation path that connects, a second circulation path that connects the orbital path 31c and the first circulation path 33c, and a second circulation path that connects the orbital path 31d and the first circulation path 33d. The plurality of rollers 20a circulate in an annular path constituted by a track path 31a, a second circulation path of the second end cap 23b, a first circulation path 33a, and a second circulation path 37a of the first end cap 23a. There is. The plurality of rollers 20b circulate in an annular path configured by a track path 31b, a second circulation path of the second end cap 23b, a first circulation path 33b, and a second circulation path of the first end cap 23a. . The plurality of rollers 20c circulate in an annular path configured by a track path 31c, a second circulation path of the second end cap 23b, a first circulation path 33c, and a second circulation path of the first end cap 23a. . The plurality of rollers 20d circulate in an annular path configured by a track path 31d, a second circulation path of the second end cap 23b, a first circulation path 33d, and a second circulation path of the first end cap 23a. .

Next, the configuration of the holding members 41a, 41b that hold the rollers 20a, 20b, 20c, 20d in the casing 22a will be explained. The holding member 41a includes a holding plate 42a and an attachment mechanism 49a. The holding member 41b includes a holding plate 42b and an attachment mechanism including a rod-shaped first fixing member 44b. The structure of the holding member 41b is the same as that of the holding member 41a, so the explanation thereof will be omitted. FIG. 5 is a schematic perspective view of the holding plate 42a. FIG. 6 is an enlarged view of the area indicated by VI in FIG. FIG. 7 is an exploded perspective view of the holding member 41a including the holding plate 42a. FIG. 8 is a schematic side view of the holding plate 42a. FIG. 9 is a schematic side view of the holding plate 42a. FIG. 10 is a schematic cross-sectional view of the holding plate 42a. FIG. 11 is an enlarged view schematically showing the periphery of the first tongue portion and the second tongue portion of the holding plate 42a. FIG. 12 is an enlarged view schematically showing the periphery of the first tongue portion and the second tongue portion of the holding plate 42a.

5 to 12, the holding member 41a includes a holding plate 42a, a longitudinally long rod-shaped first fixing member 44a, and a pair of second fixing members 45a provided with an interval in the longitudinal direction. , 45b (see especially FIG. 7). The holding plate 42a has a substantially triangular prism shape. Both ends 54a and 54b of the holding plate 42a in the longitudinal direction are flat. The holding plate 42a includes second guide surfaces 46a, 46b that guide the rollers 20a, 20b by contacting second end surfaces 52a, 52b located on the other side of the rollers 20a, 20b, respectively. Further, the holding plate 42a is provided with a recessed groove 47a to accommodate the first fixing member 44a. The groove portion 47a has a shape extending along the longitudinal direction. Further, the holding plate 42a is provided with through holes 48a and 48b for accommodating second fixing members 45a and 45b, respectively. A pair of through holes 48a and 48b are provided at intervals in the longitudinal direction. The holding plate 42a is moved in the direction shown by the dashed-dotted line in FIG. 7 by a bolt (not shown) with the first fixing member 44a accommodated in the groove 47a and the second fixing members 45a, 45b accommodated in the through holes 48a, 48b, respectively. They are connected and attached to the casing 22a side. The first fixing member 44a and the second fixing members 45a, 45b function as an attachment mechanism 49a for attaching the retaining plate 42a to the casing 22a side.

The holding plate 42a is provided with a first tongue portion 61a and a second tongue portion 62a. The first tongue portion 61a includes a portion of the second guide surface 46a. Specifically, the surface of the first tongue portion 61a that faces the first guide surface 39a becomes a part of the second guide surface 46a. The first tongue portion 61a has a first fixed end 63a on the longitudinal end 54a side of the holding plate 42a, and a first free end 64a on the longitudinal center side of the holding plate 42a. The first tongue portion 61a includes a first raised portion 65a provided on the second guide surface 46a so as to swell toward the first guide surface 39a side. The first raised portion 65a includes a first region 71a, a second region 72a, and a third region 73a in order in the longitudinal direction from the portion where the first fixed end 63a is located. That is, the first region 71a includes the first fixed end 63a, the third region 73a includes the first free end 64a, and the second region 72a is located between the first region 71a and the third region 73a. The first region 71a is composed of an inclined surface whose protrusion amount gradually increases from the first fixed end 63a toward the center in the longitudinal direction, that is, the second region 72a. The second region 72a is formed of a flat surface, and is the region that swells the most at the center of the first tongue portion 61a in the longitudinal direction. The third region 73a is composed of an inclined surface whose protrusion amount gradually decreases from the longitudinal center, that is, the second region 72a, toward the first free end 64a. The first tongue portion 61a can be elastically deformed from the first fixed end 63a in a direction perpendicular to the second guide surface 46a.

The second tongue portion 62a also includes a portion of the second guide surface 46a. Specifically, the surface of the second tongue portion 62a that faces the first guide surface 39a becomes a part of the second guide surface 46a. The second tongue-shaped portion 62a has a second fixed end 66a at the center in the longitudinal direction of the holding plate 42a, and a second free end 67a at the end 54a in the longitudinal direction of the holding plate 42a. The second tongue portion 62a includes a second raised portion 68a provided on the second guide surface 46a so as to swell toward the first guide surface 39a side. The second raised portion 68a includes a fourth region 74a, a fifth region 75a, and a sixth region 76a in the longitudinal direction from the portion where the second fixed end 66a is located. That is, the fourth region 74a includes the second fixed end 66a, the sixth region 76a includes the second free end 67a, and the fifth region 75a is located between the fourth region 74a and the sixth region 76a. The fourth region 74a is composed of an inclined surface whose protrusion amount gradually increases from the second fixed end 66a toward the end 54a in the longitudinal direction, that is, toward the fifth region 75a. The fifth region 75a is formed of a flat surface, and is the region that swells the most at the center of the second tongue portion 62a in the longitudinal direction. The sixth region 76a is constituted by an inclined surface whose protrusion amount gradually decreases from the end 54a side in the longitudinal direction, that is, from the fifth region 75a toward the second free end 67a. The second tongue portion 62a can be elastically deformed from the second fixed end 66a in a direction perpendicular to the second guide surface 46a.

A gap 69a is provided around the first tongue portion 61a and the second tongue portion 62a, except for the area where the first fixed end 63a and the second fixed end 66a are located. The first tongue portion 61a and the second tongue portion 62a are spaced apart from each other in the rotation axis direction of the roller 20a rolling on the first guide surface 39a and the second guide surface 46a. That is, a gap 69a is also arranged between the first tongue portion 61a and the second tongue portion 62a. The length L ₂ of the second tongue 62a in the longitudinal direction is longer than the length L ₁ of the first tongue 61a in the longitudinal direction. Further, the position of the second region 72a, which is the most protruding region of the first raised portion 65a, and the position of the fifth region 75a, which is the most projected region of the second raised portion 68a, overlap in the longitudinal direction. Note that the amount of protrusion (protrusion height) of the second region 72a and the amount of protrusion (protrusion height) of the fifth region 75a are configured to be equal.

In this embodiment, a pair of first tongue portions 61a and a pair of second tongue portions 62a are provided at intervals in the longitudinal direction. Specifically, a pair of first tongue-shaped portions 61a and a pair of second tongue-shaped portions 62a are provided near both ends 54a and 54b of the holding plate 42a in the longitudinal direction. Further, the first tongue portion 61a and the second tongue portion 62a are each provided also on the second guide surface 46b side. That is, the holding plate 42a is provided with a total of four first tongue portions 61a and four second tongue portions 62a.

According to the linear motion guide unit 10a, the holding plate 42a is provided with the first tongue portion 61a having the above configuration. Then, the roller 20a enters the load area from the first fixed end 63a side of the first tongue portion 61a. Since the first tongue portion 61a includes the first raised portion 65a, the roller 20a can be moved while pressing the roller 20a toward the first guide surface 39a due to elastic deformation of the first tongue portion 61a. Here, in the first tongue portion 61a, the roller 20a moves from the first fixed end 63a side to the first free end 64a side, but as it moves toward the first free end 64a side, the roller 20a is elastically deformed. The pressing force of 20a becomes small. According to the linear motion guide unit 10a of the present disclosure, the second tongue portion 62a having the above configuration is provided on the holding plate 42a. In the second tongue portion 62a, in the longitudinal direction, opposite to the first tongue portion 61a, the no-load region side becomes a second free end 67a, and the load region side becomes a second fixed end 66a. Since the second tongue portion 62a includes the second raised portion 68a, the roller 20a can be moved while pressing the roller 20a toward the first guide surface 39a due to elastic deformation of the second tongue portion 62a. In this case, the roller 20a moves toward the second fixed end 66a of the second tongue 62a, that is, toward the base of the second tongue 62a. Then, even in the area where the pressing force is small in the first tongue part 61a, the second tongue part 62a, which has a high pressing force of the roller 20a due to elastic deformation, strongly presses the roller 20a against the first guide surface 39a side. The roller 20a can be moved at the same time. Therefore, when the roller 20a moves toward the center in the longitudinal direction, the posture of the roller 20a can be appropriately corrected and guided. As a result, it is possible to suppress the occurrence of skew in the track path 31a and ensure smooth sliding of the slider 21a.

Note that in this embodiment, within the processing tolerance range and the preload range, there is a possibility that the position at which the no-load area switches to the load area may shift slightly in each linear motion guide unit 10a; However, according to the linear motion guide unit 10a having the first tongue portion 61a and the second tongue portion 62a configured as described above, it is possible to reliably press the end face of the roller 20a, so that skew in the track path 31a can be reduced. This can be suppressed to ensure smooth sliding of the slider 21a.

In this embodiment, a pair of first tongue portions 61a and a pair of second tongue portions 62a are provided at intervals in the longitudinal direction. Therefore, smooth sliding of the slider 21a can be ensured on both sides of the linear guide unit 10a in the longitudinal direction.

In this embodiment, the first tongue portion 61a and the second tongue portion 62a are arranged at intervals in the direction of the rotational axis of the roller 20a rolling on the first guide surface 39a and the second guide surface 46a. ing. Therefore, in the longitudinal direction of the holding plate 42a, the region where the first tongue portion 61a is located and the region where the second tongue portion 62a is located can overlap. Then, the roller 20a can be moved without interrupting the pressing force of the roller 20a by the first tongue-shaped portion 61a and the second tongue-shaped portion 62a, each of which is elastically deformed. Therefore, the occurrence of skew can be more reliably suppressed, and smooth sliding of the slider 21a can be more reliably ensured.

In this embodiment, a gap 69a is provided around the first tongue portion 61a and the second tongue portion 62a, except for the area where the first fixed end 63a and the second fixed end 66a are located. Therefore, when the first tongue 61a and the second tongue 62a elastically deform from each fixed end, other parts of the holding plate 42a, that is, the first tongue 61a and the second tongue It is possible to greatly reduce the possibility that the portion where 62a is not provided will interfere with the first tongue portion 61a and the second tongue portion 62a. Therefore, it is possible to more reliably suppress the occurrence of skew and ensure smooth sliding of the slider 21a.

In this embodiment, the length of the second tongue portion 62a in the longitudinal direction is longer than the length of the first tongue portion 61a in the longitudinal direction. Therefore, by appropriately elastically deforming the second tongue portion 62a such that the second fixed end 66a is on the longitudinal center side and the second free end 67a is on the longitudinal end 54a side, This allows the roller 20a to move more smoothly. Therefore, smooth sliding of the slider 21a can be ensured more reliably.

In the present embodiment, the position of the second region 72a, which is the most protruding region of the first raised portion 65a, and the position of the fifth region 75a, which is the most projected region of the second raised portion 68a, overlap in the longitudinal direction. are doing. Therefore, the pressing of the roller 20a by the first raised portion 65a included in the first tongue portion 61a and the pressing of the roller 20a by the second raised portion 68a included in the second tongue portion 62a can be overlapped in the longitudinal direction. . This reduces the amount of deflection of the first tongue 61a and the second tongue 62a, which have different fulcrum points, and even if one of the protruding areas moves away from the roller, the protruding area on the other side will not bend the roller. can be pressed. Therefore, by pressing the roller 20a with the first tongue portion 61a and pressing the roller 20a with the second tongue portion 62a, the posture of the roller 20a can be more reliably corrected and the occurrence of skew can be suppressed. As a result, smooth sliding of the slider 21a can be ensured more reliably.

(Other embodiments)
In the above embodiment, the first tongue portion and the second tongue portion are spaced apart from each other in the direction of the rotational axis of the roller rolling on the first guide surface and the second guide surface. However, the present invention is not limited thereto, and the first tongue portion and the second tongue portion may be arranged side by side in the longitudinal direction. In this case, the longitudinal distance between the first tongue and the second tongue may be smaller than the diameter of the roller. By doing this, in the region where the first tongue-like part and the second tongue-like part are provided, the first tongue-like part or the second tongue-like part and the roller are brought into contact and the roller is actively pushed. Can be done. Alternatively, a configuration may be adopted in which no gap is provided around the first tongue portion and the second tongue portion. Further, the positions of the first tongue portion and the second tongue portion in the Z direction may be reversed. Further, the length of the second tongue in the longitudinal direction may be shorter than the length of the first tongue, and the length of the second tongue in the longitudinal direction and the length of the first tongue The lengths in the directions may be equal.

Further, in the above embodiment, a pair of first tongue portions and a pair of second tongue portions are provided in the longitudinal direction, but the present invention is not limited to this, and the first tongue portion is provided only on one side in the longitudinal direction. It is good also as providing a part and a 2nd tongue-like part.

It should be understood that the embodiments disclosed herein are illustrative in all respects and are not restrictive in any respect. The scope of the present invention is defined by the claims, and it is intended that all changes within the meaning and range equivalent to the claims are included.

10a linear motion guide unit, 11a rail, 12a rail upper end surface, 12b rail lower end surface, 13a first rail side surface, 13b second rail side surface, 14a rail front end surface, 14b rail rear end surface, 15a, 15b first raceway groove, 16a , 16b, 16c, 16d first raceway surface, 17a, 17b side wall surface, 18, 48a, 48b through hole, 20a, 20b, 20c, 20d roller, 21a slider, 22a casing, 23a end cap (first end cap) , 23b end cap (second end cap), 24a recess, 27a, 27b end seal, 28a, 28b rolling surface, 29 mounting hole, 30a spacer, 31a, 31b, 31c, 31d raceway, 32a, 32b, 32c , 32d Second raceway surface, 33a, 33b, 33c, 33d First circulation path, 34a, 34b, 34c, 34d Sleeve, 35a, 35b, 35c, 35d First divided member, 36a, 36b, 36c, 36d Second division Member, 37a Second circulation path, 39a, 39b, 39c, 39d First guide surface, 41a, 41b Holding member, 42a, 42b Holding plate, 44a, 44b First fixing member, 45a, 45b Second fixing member, 46a, 46b second guide surface, 47a groove, 49a attachment mechanism, 51a, 51b first end surface, 52a, 52b second end surface, 54a, 54b end, 61a first tongue, 62a second tongue, 63a first Fixed end, 64a first free end, 65a first raised part, 66a second fixed end, 67a second free end, 68a second raised part, 69a gap, 71a first region, 72a second region, 73a third region , 74a fourth region, 75a fifth region, 76a sixth region.

Claims (6)

a rail having a first track surface extending in the longitudinal direction;
a slider that is movably attached to the rail and has a second raceway surface that faces the first raceway surface;
rollers as a plurality of rolling elements that roll on a track path composed of the first raceway surface and the second raceway surface;
The slider is
a casing that is provided with a first circulation path parallel to the trackway and includes a first guide surface and the second track surface that guide the roller by contacting a first end surface located on one side of the roller;
an end cap that is disposed on one side of the casing in the longitudinal direction and is provided with a second circulation path that connects the trackway and the first circulation path;
a holding member that holds the roller to the casing;
Each of the rollers circulates in an annular path formed by the track path, the first circulation path, and the second circulation path,
The holding member is
a holding plate having a shape extending in the longitudinal direction and having a second guide surface that guides the roller by contacting a second end surface located on the other side of the roller;
an attachment mechanism for attaching the holding plate to the casing side,
The retaining plate includes:
a first tongue-shaped part that includes a part of the second guide surface, a longitudinal end side of the holding plate serving as a first fixed end, and a longitudinal center side of the holding plate serving as a first free end;
a second tongue-like part that includes a part of the second guide surface, a second fixed end on the longitudinal center side of the holding plate, and a second free end on the longitudinal end side of the holding plate; It is provided,
The first tongue-shaped portion includes a first raised portion provided on the second guide surface so as to rise toward the first guide surface,
The second tongue-shaped portion is a linear motion guide unit including a second raised portion provided on the second guide surface so as to be raised toward the first guide surface. The linear motion guide unit according to claim 1, wherein the first tongue portion and the second tongue portion are each provided as a pair with an interval in the longitudinal direction. 1 . The first tongue portion and the second tongue portion are spaced apart from each other in the direction of the rotational axis of the roller rolling on the first guide surface and the second guide surface. Or the linear motion guide unit according to claim 2. Claim 1 or Claim 2, wherein a gap is provided around the first tongue-like part and the second tongue-like part except for a region where the first fixed end and the second fixed end are located. The linear motion guide unit described in . The linear motion guide unit according to claim 1 or 2, wherein the length of the second tongue in the longitudinal direction is longer than the length of the first tongue in the longitudinal direction. The linear motion guide unit according to claim 1 or 2, wherein the position of the most protruding area of the first raised part and the position of the most protruding area of the second raised part overlap in the longitudinal direction. .

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