CN211259373U - Chain belt type retainer and linear moving device - Google Patents

Abstract

The utility model discloses a chain belt type retainer and a linear moving device, wherein the chain belt type retainer comprises two flexible chain belts and a plurality of spacers. The two flexible chain belts are parallel to each other and extend along the same extension direction, and the two flexible chain belts jointly define a central plane. The plurality of spacers are equidistantly spaced from each other and arranged along the extension direction, and each spacer is respectively connected between the two flexible chain belts, and each spacer is divided into a first spacer plate and a second spacer plate by the central plane, and the plurality of first spacers are all located on the same side of the central plane, and each first spacer plate comprises a distal end away from the central plane, and a long slot is provided at the distal end, and the long slot is perpendicular to the extension direction. The chain belt type retainer can be applied to a linear moving device.

Description

Chain-belt retainer and linear movement device

technical field

The utility model relates to a holder and a mechanical device with the holder, in particular to a chain-belt type holder and a linear moving device applying the same.

Background technique

For linear moving devices (such as linear slides, ball screws or ball splines) that use ball contact transmission, ball cages are often used to accommodate multiple balls to avoid friction and collision between the balls. Linear movement units operate more smoothly and with less noise.

Generally, a ball cage has a plurality of spacers arranged at intervals, and the plurality of spacers are connected to each other by a connecting belt, and a plurality of balls are accommodated between the plurality of spacers. However, when the ball cage is bent (for example, the ball cage is bent along the ball circulation channel of the linear moving device), the plurality of spacers located at the bending position will be stressed and the outer sides of the plurality of spacers will be separated from each other. The distance between the balls becomes larger, resulting in a decrease in the ball holding force and a situation where the balls are prone to loosening.

Utility model content

In view of the above, in one embodiment, a chain-belt cage is provided for holding a plurality of rolling bodies, and the chain-belt cage includes two flexible chain belts and a plurality of spacers. The two flexible link belts are parallel to each other and extend along the same extension direction, and the two flexible link belts jointly define a central plane. A plurality of spacers are equidistantly spaced from each other and arranged along the extending direction, each spacer is respectively connected between two flexible link belts, each spacer is divided into a first spacer plate and a second spacer plate by the central surface, and a plurality of first spacer plates The partition plates are all located on the same side of the central surface. Each of the first partition plates includes a distal end away from the central surface. The distal end is provided with an elongated groove, and the elongated groove is perpendicular to the extending direction.

In one embodiment, a linear moving device is provided, which includes a guide member, a moving member, the above-mentioned chain-belt-type retainer, and a plurality of rolling bodies. The moving piece is arranged on the guide piece, a circulation channel is arranged between the guide piece and the moving piece, the circulation channel includes a curved channel, and the curved channel has an outer curved groove wall and an inner curved groove wall. The chain-belt retainer is accommodated in the circulation channel, and the slotted grooves of the first spacer plates of each spacer located in the curved channel are adjacent to and curved toward the outer side of the groove wall. The plurality of rolling bodies are accommodated between the plurality of spacers of the chain-belt cage.

To sum up, according to the chain-type retainer of the embodiment of the present invention, by forming a long notch at the distal end of the first spacer plate on the same side of each spacer, when the chain-type retainer is bent, for example, the chain belt can be bent. After the type retainer is accommodated in a circulation channel with a curved channel of a linear moving device (such as a linear slide device, a ball screw device, and a ball spline device), the distal end of each spacer located in the curved channel can be forced toward The rolling elements are opened in the direction to achieve a substantial increase in the holding force to prevent the rolling elements located at the curved grooves from disengaging from the chain-belt cage.

Description of drawings

FIG. 1 is a perspective view of an embodiment of the chain-belt retainer of the present invention.

FIG. 2 is a partial enlarged perspective view of an embodiment of the chain-belt retainer of the present invention.

FIG. 3 is a side view of an embodiment of the chain-belt retainer of the present invention.

FIG. 4 is a partial cross-sectional view of an embodiment of the chain-belt retainer of the present invention.

5 is a partial cross-sectional view of another embodiment of the chain-belt retainer of the present invention.

6 is a partial cross-sectional view of another embodiment of the chain-belt retainer of the present invention.

7 is a partial cross-sectional view of another embodiment of the chain-belt retainer of the present invention.

FIG. 8 is a perspective view of an embodiment of the linear moving device of the present invention.

FIG. 9 is a partial cross-sectional view of a chain-belt retainer of the present invention applied to a linear moving device.

FIG. 10 is a schematic plan view of the chain-belt retainer of the present invention being accommodated in the circulation channel.

FIG. 11 is a partial enlarged view of FIG. 10 .

Among them, reference numerals:

1 Chain retainer 10 Flexible chain

11 Spacer 111 First elastic retaining piece

112 First end 113 First root

115 The second elastic retaining piece 116 The second end

117 Second root 118 First holding surface

1181 The first reinforcing protrusion 1182 The oil storage tank

119 Second holding surface 1191 Second reinforcing protrusion

12 First partition plate 13 Second partition plate

14 Distal end 15 Long slot

151 First bevel 152 Second bevel

153 Bottom edge of groove 16 Center

17 Opposite end 2 Linear movement device

20 Guide 201 Linear track

21 Moving parts 211 Ring channel

22 Circulation channel 23 Curved channel

231 Outer curved groove wall 232 Inner curved groove wall

B Rolling element C Center surface

L Arrow T1, T2, T3 Thickness

Detailed ways

FIG. 1 is a perspective view of an embodiment of a chain-belt retainer of the present invention, FIG. 2 is a partially enlarged perspective view of an embodiment of a chain-belt retainer of the present invention, and FIG. 3 is an embodiment of the chain-belt retainer of the present invention. 4 is a partial cross-sectional view of an embodiment of the chain-belt retainer of the present invention. As shown in FIGS. 1 to 3 , the chain-type holder 1 of the present embodiment includes two flexible chain belts 10 and a plurality of spacers 11 , and the two flexible chain belts 10 are parallel to each other and extend in the same extension direction ( For example, in this example, the flexible link belt 10 is extended along the Y-axis direction), the plurality of spacers 11 are arranged at equal intervals along the extending direction of the flexible link belt 10, and the plurality of spacers 11 are respectively connected between the two flexible link belts 10 .

In some embodiments, the above-mentioned plurality of spacers 11 and the two flexible link belts 10 can be integrally formed to avoid the situation that the spacers 11 and the flexible link belts 10 are separated from each other by force during use, for example For example, the plurality of spacers 11 and the two flexible link belts 10 can be integrally formed by injection molding, but this is not limited.

In some embodiments, the chain-belt retainer 1 may be used to retain a plurality of rolling bodies B. As shown in FIG. As shown in FIGS. 1 to 4 , the chain-belt cage 1 is used to accommodate a plurality of rolling bodies B, wherein each rolling body B can be a ball or a roller. In this embodiment, each spacer 11 is opposite to two A first holding surface 118 and a second holding surface 119 are respectively concave on the sides, and the first holding surface 118 and the second holding surface 119 face the extending direction of the flexible link belt 10 (as shown in FIG. 2 and FIG. 3 , the first holding surface 118 and the second holding surface 119 are The holding surface 118 and the second holding surface 119 face the Y-axis direction), and the plurality of rolling elements B are accommodated between the plurality of spacers 11 of the chain-belt cage 1 , specifically, two spaces adjacent to each other. An accommodating space is formed between the adjacent first holding surfaces 118 and the second holding surfaces 119 of the component 11, and each rolling element B is correspondingly accommodated in each accommodating space to receive the first holding surface 118 and the second holding surface 118. Face 119 remains positioned. In addition, in this embodiment, the first holding surface 118 and the second holding surface 119 are spherical surfaces corresponding to the shapes of the rolling elements B, so that the rolling elements B can be more stably held in the accommodating space, but this does not Not limited, the first holding surface 118 and the second holding surface 119 can also be other shapes (eg, arc shapes).

In some embodiments, the chain-belt retainer 1 can be applied to various linear moving devices that utilize rolling elements B to be cyclically actuated, such as ball screws, ball splines or linear slide rails, etc., to avoid friction between the rolling elements B. Friction and collisions, etc. occur, and linear motion units operate more smoothly and with less noise. In addition, since the plurality of spacers 11 are respectively connected between the two flexible link belts 10 , the link-belt retainer 1 can be freely bent so as to be accommodated in circulation channels of various shapes.

As shown in FIG. 1 to FIG. 3 , in this embodiment, the two flexible fastener tapes 10 extend along the same extending direction to jointly define a central plane C (as shown in FIG. 1 , the central plane C here is XY plane), each spacer 11 is divided into a first spacer plate 12 and a second spacer plate 13 by the central plane C, specifically, each spacer 11 is divided into two block plates by the central plane C (the first spacer plate 12 and second partition plate 13), the plurality of first partition plates 12 of the plurality of spacers 11 are located on the same side of the central surface C, and the plurality of second partition plates 13 of the plurality of spacers 11 are located on the central surface C The size of the first partition plate 12 and the second partition plate 13 of each spacer 11 may be the same or different. For example, in this embodiment, each spacer 11 is an annular body, which constitutes each spacer 11 The first partition plate 12 and the second partition plate 13 separated by the central plane C are semi-annular, but each spacer 11 can also be of other shapes, which is not limited in this embodiment.

As shown in FIG. 1 to FIG. 3 , in this embodiment, each first partition plate 12 of each spacer 11 includes a distal end 14 away from the central surface C, and the distal end 14 is provided with an elongated groove 15 , which is long The notches 15 are perpendicular to the extending direction of the flexible link belt 10 . For example, in the present embodiment, the flexible link belt 10 extends along the Y-axis direction, and each long notched groove 15 is recessed in the Z-axis direction at each first interval The distal end 14 of the plate 12 penetrates through each of the first spacer plates 12 along the X-axis direction, forming long notches 15 to separate each of the first spacer plates 12 into a first elastic holding piece 111 and a second elastic holding piece 115 , wherein each The elongated groove 15 , the first elastic holding piece 111 and the second elastic holding piece 115 can have the following various embodiments, which are described in detail below with reference to the accompanying drawings.

As shown in FIG. 3 and FIG. 4 , in the present embodiment, the cross-section of each long groove 15 of each first partition plate 12 is generally V-shaped and has a groove bottom edge 153 and a groove bottom edge 153 connected to opposite sides of the groove bottom edge 153 . The first inclined surface 151 and the second inclined surface 152, the surfaces of the first elastic retaining pieces 111 of each first partition plate 12 located on the opposite side of the first inclined surface 151 constitute a partial first retaining surface 118, and the first retaining surface 118 of each first partition plate 12 is The surfaces of the two elastic holding pieces 115 located on the opposite sides of the second inclined surface 152 form a partial second holding surface 119, whereby when the first elastic holding piece 111 and the second elastic holding piece 115 are elastically displaced, the resistance to the rolling elements can be changed. The holding force of B, for example, when the first elastic holding piece 111 and the second elastic holding piece 115 are elastically opened in the direction away from the long groove 15 , the first elastic holding piece 111 and the second elastic holding piece 115 can be respectively directed toward The rolling elements B approach to increase the holding force. In some embodiments, the groove depth of each long groove 15 is preferably greater than 1/3 of the diameter of each rolling element B, so that the first elastic holding piece 111 and the second elastic holding piece 115 are easily elastically displaced when they are stressed. To strengthen the holding force of the rolling elements B, however, the size or shape of the above-mentioned long cut grooves 15 is only an example, and is not intended to limit the present invention.

In some embodiments, the first inclined surface 151 and the second inclined surface 152 of the cross section of each long groove 15 of each first partition plate 12 may be the same plane or curved surface, and the first elastic retaining piece 111 and the second elastic retaining piece 115 Different thickness variations can be made based on the shape of the cross-section of each elongated groove 15 . As shown in FIG. 4 , the first inclined surface 151 and the second inclined surface 152 of each long groove 15 of the first partition plate 12 of the present embodiment are both flat surfaces, and the inclination angles of the first inclined surface 151 and the second inclined surface 152 are the same, The first elastic holding piece 111 and the second elastic holding piece 115 are arranged symmetrically with respect to the long groove 15 .

Or, as shown in FIG. 5 and FIG. 6 , which are partial cross-sectional views of other embodiments of the chain-belt retainer of the present invention, the first inclined surfaces 151 and the second sloping surfaces of each long groove 15 of the first partition plate 12 of this embodiment are The inclined surfaces 152 are all curved surfaces, and the curvatures of the first inclined surface 151 and the second inclined surface 152 are the same, so that the first elastic retaining sheet 111 and the second elastic retaining sheet 115 can also be symmetrically arranged on the basis of the long groove 15. In some embodiments Among them, the first inclined surface 151 and the second inclined surface 152 may be concave curved surfaces or convex curved surfaces, and the types of the curved surfaces may be curved curved surfaces, parabolic curved surfaces, or curved surfaces of other shapes. For example, in the embodiment of FIG. 5 , the first inclined surface 151 and the second inclined surface 152 are both concave curved surfaces, or in the embodiment of FIG. 6 , the first inclined surface 151 and the second inclined surface 152 are convex curved surfaces, so that the first inclined surface 151 The second inclined surface 152 can prevent the first elastic retaining piece 111 and the second elastic retaining piece 115 from being close to each other, so as to prevent the distance between the distal ends 14 of the plurality of spacers 11 from being too large, so as to improve the retaining force and avoid the rolling element B loose.

However, the above-mentioned embodiment is only an example, and the first inclined surface 151 and the second inclined surface 152 of each long groove 15 can also be inclined surfaces of different shapes, depending on the actual use requirements. An inclined surface 151 is a plane, and the second inclined surface 152 is a curved surface; alternatively, the first inclined surface 151 of each long groove 15 is a curved surface, and the second inclined surface 152 is a plane; or, the first inclined surface of each long groove 15 is a plane Both the 151 and the second inclined surface 152 are curved surfaces, but the curvatures of the first inclined surface 151 and the second inclined surface 152 are different.

In some embodiments, the groove bottom edge 153 of the cross-section of each long groove 15 of each first spacer plate 12 can be an arc-shaped bottom edge, a flat-shaped bottom edge or an acute-angled bottom edge. As shown in FIGS. 4 and 5 , in this embodiment, the groove bottom edge 153 of each long groove 15 is an arc-shaped bottom edge, or, as shown in FIGS. 6 and 7 , in this embodiment, each long groove 15 is The groove bottom edge 153 of the groove 15 is an acute-angled bottom edge.

As shown in FIG. 3 , in some embodiments, each second partition plate 13 has an opposite end 17 away from the distal end 14 of each first partition plate 12 , and the thickness of the opposite end 17 is smaller than the thickness of the distal end 14 , also That is to say, the distal end 14 of the first partition plate 12 has a relatively large thickness, so that after the long groove 15 is formed in the distal end 14, the first elastic retaining sheet 111 and the second elastic retaining sheet 115 can still maintain a certain thickness and have a relatively large thickness. good structural strength.

3 and FIG. 4 , in this embodiment, each spacer 11 includes a central portion 16 adjacent to the central surface C, and the elongated groove 15 does not extend to the central portion 16 , and the first elastic retaining piece 111 has The second elastic retaining piece 115 has a second end 116 away from the first end 112 of the central portion 16 , wherein the sum of the thickness T1 of the first end 112 and the thickness T2 of the second end 116 It is larger than the thickness T3 of the central portion 16 . Therefore, through the above-mentioned structural design, even if the first elastic holding piece 111 and the second elastic holding piece 115 are forced to be relatively close to each other to close the long slot 15, the distance between the distal ends 14 of the two adjacent spacers 11 It will still be smaller than the diameter of the rolling element B to effectively prevent the rolling element B from being separated from the chain belt cage 1 . In addition, the first elastic holding piece 111 and the second elastic holding piece 115 can also have better structural strength to avoid friction and collision between the rolling elements B and the like.

As shown in FIG. 4 , in one embodiment, the first elastic retaining piece 111 has a first root portion 113 , the first root portion 113 is adjacent to the central portion 16 relative to the first end portion 112 , and the thickness of the first end portion 112 is greater than The thickness of the first root portion 113, the second elastic retaining piece 115 also has a second root portion 117, the second root portion 117 is adjacent to the central portion 16 relative to the second end portion 116, and the thickness of the second end portion 116 is greater than that of the second root portion 117. Therefore, the first elastic retaining sheet 111 and the second elastic retaining sheet 115 can have better structural strength and avoid friction and collision between the rolling elements B. As shown in FIG. 6 , in another embodiment, the thickness of the first end portion 112 of the first elastic retaining sheet 111 may also be smaller than the thickness of the first root portion 113 , and the thickness of the second end portion 116 of the second elastic retaining sheet 115 The thickness can also be smaller than the thickness of the second root portion 117 , so that the first elastic retaining sheet 111 and the second elastic retaining sheet 115 can have better elasticity and better fit the surface of the rolling body B, and the first elastic retaining sheet 111 and the second elastic retaining sheet 115 can have better elasticity. The holding piece 111 and the second elastic holding piece 115 have better mobility, which facilitates elastic displacement under force and strengthens the holding force for the rolling element B. As shown in FIG.

To sum up, in the embodiment of the present invention, the long notched groove 15 is provided on the distal end 14 of the first spacer plate 12 on the same side of each spacer 11, so that when the chain-belt retainer 1 is bent, for example, the chain-belt retainer After the device 1 is accommodated in the circulation channel with the curved channel of the linear moving device (such as the linear slide device, the ball screw device and the ball spline device), the first elastic retaining piece 111 of each spacer 11 located in the curved channel The second elastic retaining piece 115 can be forced to open in the direction of the rolling element B, so as to greatly increase the holding force and prevent the rolling element B located at the curved channel from detaching from the chain-belt cage 1. The following will be further detailed through different embodiments. illustrate.

Please compare FIGS. 8 and 9 , wherein FIG. 8 is a perspective view of an embodiment of the linear moving device of the present invention, and FIG. 9 is a partial cross-sectional view of the chain-belt retainer applied to the linear moving device. The linear moving device 2 includes a guide member 20 and a moving member 21. The linear moving device 2 in this embodiment is a linear slide rail device, wherein the guide member 20 is a slide rail and has two linear rails 201. The two linear rails 201 are respectively set. on opposite sides of the guide member 20 . The moving member 21 is a sliding seat and is slidably mounted on the guiding member 20 , and at least one circulation channel 22 (here is a plurality of circulation channels 22 , but not limited) is provided between the guiding member 20 and the moving member 21 . , a plurality of chain belt cages 1 installed with a plurality of rolling bodies B are correspondingly accommodated in the circulation channel 22, so that the guiding member 20 and the moving member 21 are in rolling contact state through the rolling bodies B, so as to reduce the guiding The frictional force when the guide member 20 and the moving member 21 move relative to each other, thereby reducing the driving torque. In addition, in this Example, although each rolling element B is a ball, it may be a roller, and it is not limited.

As shown in FIG. 9 , in this embodiment, the moving member 21 has a plurality of annular channels 211 , and each annular channel 211 corresponds to each linear track 201 of the guide member 20 to form a circulating channel 22 together. As shown in FIG. 10 , in this embodiment, the circulation channel 22 is represented by a dotted line, and the circulation channel 22 constitutes the return channel of the chain-belt retainer 1 for supplying the chain-belt retainer 1 and being accommodated in the chain-belt retainer 1 . The plurality of rolling elements B are circulated back along the circulation channel 22 .

As shown in FIG. 10 and FIG. 11 , here, the chain-belt retainer 1 surrounds an annular structure corresponding to the shape of the circulation channel 22 , and the first partition plates 12 of the spacers 11 are located in the outer ring of the annular structure. Each second partition plate 13 of each spacer 11 is located on the inner circumference of the annular structure. In this embodiment, the circulation channel 22 includes two curved channels 23, and each curved channel 23 has an outer curved channel wall. 231 and the inner curved groove wall 232, when the chain-belt cage 1 and the plurality of rolling bodies B move back and forth along the circulation channel 22, move to the first partition plate 12 of each spacer 11 in each curved channel 23 The long groove 15 will be adjacent to and bend the groove wall 231 toward the outside, and the distal ends 14 of the spacers 11 located in the curved grooves 23 will be subjected to the stress caused by the bending of the chain-belt retainer 1, so that each The first elastic holding piece 111 and the second elastic holding piece 115 of the spacer 11 are forced to open in the direction of the rolling element B (as shown by the arrow L in FIG. 11 ), so as to strengthen the holding force and prevent them from being located in the curved channel 23 The rolling element B at the position is detached from the chain-belt cage 1 .

In some embodiments, the linear moving device 2 can also be a ball screw device, and the guide member 20 and the moving member 21 are a screw rod and a nut, respectively. Alternatively, the linear moving device 2 can also be a ball spline device, and the guide member 20 and the moving member 21 are respectively a spline shaft and an outer sleeve. Further, when the linear movement device 2 is a ball screw device or a ball spline device, each rolling element B is a ball.

As shown in FIG. 2 and FIG. 4 , in some embodiments, the first retaining surface 118 of each spacer 11 may further be provided with at least one first reinforcing protrusion 1181 , and the second retaining surface 119 may be further provided with at least one The second reinforcing protrusions 1191 are used to strengthen the structural strength of each spacer 11 , reduce the amount of deformation caused by the force of each spacer 11 , and thereby improve the retention force of the rolling elements B. As shown in FIG. In addition, the adjacent first reinforcing protrusions 1181 and the second reinforcing protrusions 1191 of the two adjacent spacers 11 contact a rolling body B together, so as to achieve the effect of supporting the rolling body B. In some embodiments, the first reinforcing convex portion 1181 and the second reinforcing convex portion 1191 may be integrally formed with each of the spacers 11 .

As shown in FIG. 2 and FIG. 4 , in this embodiment, the first holding surface 118 of each spacer 11 is provided with two annular first reinforcing protrusions 1181 of different sizes, and the two first reinforcing protrusions The parts 1181 are arranged in concentric circles, and the second holding surface 119 of each spacer 11 is also provided with two annular second reinforcement protrusions 1191 of different sizes, and the two second reinforcement protrusions 1191 are arranged in concentric circles, But this is not limited. In fact, the first reinforcing convex portion 1181 and the second reinforcing convex portion 1191 can also be annular structures of other shapes, such as annular structures such as triangles, quadrilaterals, pentagons or hexagons, or the first The reinforcing protrusions 1181 and the second reinforcing protrusions 1191 may also be non-annular structures such as dot-shaped, column-shaped, or block-shaped.

As shown in FIG. 2 , in this embodiment, an oil storage groove 1182 can be formed between the first reinforcing protrusion 1181 and the first holding surface 118, and the oil storage groove 1182 is used to store lubricating oil, so that the chain-belt retainer l When moving, the lubricating oil can supply oil to the rolling element B to have a lubricating function, and an oil storage groove can also be formed between the second reinforcing convex portion 1191 and the second holding surface 119 , which will not be repeated here.

Although the technical content of the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Anyone who is familiar with this technique, without departing from the spirit of the present utility model, should make some changes and modifications. Covered within the scope of the present invention, the protection scope of the present invention shall be subject to the scope defined by the appended claims.

Claims (14)

1. A chain belt type cage for holding a plurality of rolling bodies, comprising:

the two flexible chain belts are parallel to each other and extend along the same extension direction, and the two flexible chain belts jointly define a central plane; and

the spacing pieces are respectively connected between the two flexible chain belts, each spacing piece is divided into a first spacing plate and a second spacing plate by the central surface, the first spacing plates are all positioned on the same side of the central surface, each first spacing plate comprises a far end far away from the central surface, the far end is provided with a long and short groove, and the long and short groove is perpendicular to the extending direction.

2. The chain belt type retainer as claimed in claim 1, wherein each of the elongated grooves has a groove depth greater than 1/3 of a diameter of each of the rolling bodies.

3. The chain belt type retainer as claimed in claim 1, wherein each of the elongated grooves has a V-shaped cross section.

4. The chain belt type retainer of claim 3, wherein each of the elongated slots has a slot bottom edge and a first inclined surface and a second inclined surface connected to opposite sides of the slot bottom edge, the first inclined surface and the second inclined surface being a flat surface.

5. The chain belt type retainer as claimed in claim 3, wherein each of the elongated slots has a slot bottom edge and a first inclined surface and a second inclined surface connected to opposite sides of the slot bottom edge, the first inclined surface and the second inclined surface being a curved surface.

6. The chain belt type retainer of claim 3, wherein each of said elongated slots has a slot bottom edge and a first and second sloped surface connected to opposite sides of said slot bottom edge, said slot bottom edge being an arc-shaped bottom edge.

7. The chain belt type retainer as claimed in claim 3, wherein each of the elongated slots divides each of the first partition plates into a first elastic retaining piece and a second elastic retaining piece.

8. The chain belt type retainer according to claim 7, wherein each of the spacers includes a central portion adjacent to the central portion, the first elastic retaining piece has a first end portion away from the central portion, the second elastic retaining piece has a second end portion away from the central portion, and a sum of a thickness of the first end portion and a thickness of the second end portion is greater than a thickness of the central portion.

9. The chain belt retainer of claim 8, wherein the first resilient retention tab has a first root portion adjacent the central portion relative to the first end portion, and the first end portion has a thickness greater than a thickness of the first root portion.

10. The chain belt retainer of claim 8, wherein the first resilient retention tab has a first root portion adjacent the central portion relative to the first end portion, the first end portion having a thickness less than a thickness of the first root portion.

11. The chain belt retainer of claim 1, wherein each of the second spacers includes an opposite end remote from the distal end, the opposite end having a thickness less than a thickness of the distal end.

12. A linear motion device, comprising:

a guide member;

a moving member disposed on the guiding member, a circulation passage disposed between the guiding member and the moving member, the circulation passage including a curved channel having an outer curved groove wall and an inner curved groove wall;

the chain belt type retainer as claimed in any one of claims 1 to 11, which is accommodated in the circulation passage with the elongated slot of the first partition plate of each of the partitions located in the curved channel adjacent to and facing the outer curved slot wall; and

and a plurality of rolling bodies accommodated between the spacers of the chain belt type retainer.

13. The linear motion device of claim 12, wherein the linear motion device is a linear slide device, and each rolling element is a ball or a roller.

14. The linear motion device of claim 12, wherein the linear motion device is a ball screw device or a ball spline device, and each rolling element is a ball.

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