JP2023119316A - Linear guide - Google Patents

Abstract

To provide a linear guide having excellent assembly work efficiency.SOLUTION: A linear guide 1 comprises: a guide rail 2; a slider 3 comprising a base part 7 arranged on the guide rail 2, and a pair of sleeve parts 8 extending from the base part 7 at an interval in the width direction of the guide rail 2, and arranged opposite to a pair of rolling element raceways 6 of the guide rail 2; a plurality of rolling elements 4 interposed between the pair of rolling element raceways 6 and the pair of sleeve parts 8; a retainer 5 retaining the plurality of rolling elements 4 on the pair of rolling element raceways 6; and a correction member 14 detachably attached to the slider 3. The base part 7 comprises a groove part 13 in an upper surface 10, and the groove part 13 is located between the pair of sleeve parts 8. The correction member 14 expands the width of the groove part 13 while it is attached to the slider 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to linear guides.

A linear guide has a guide rail, a slider, and a plurality of rolling elements. As the slider moves along the guide rail, the rolling elements roll between the guide rail and the slider and move to the rear of the slider. Such linear guides include a circulating linear guide in which the rolling elements that have moved to the rear of the slider are returned to the front of the slider through a circulation path provided in the slider, and a non-circulating linear guide. In a non-circulating linear guide, a plurality of rolling elements are retained on the rolling element raceway of the guide rail by cages.

In order to increase the rigidity of the linear guide by eliminating the gap between the guide rail and the rolling element and the gap between the rolling element and the slider, a preload is typically applied between the guide rail, the rolling element and the slider. be done. The preload load is adjusted to a desired load, for example, by selecting the diameter of the rolling elements (see Patent Document 1, for example).

JP-A-2004-156760

Since a preload is applied between the guide rail, the rolling elements, and the slider, in the non-circulating linear guide, the slider cannot slide on the rolling elements after assembly, and the slider, cage, and rolling elements cannot be slid. cannot be changed in relation to If there is a deviation in the mutual positional relationship, it is necessary to reassemble, and there is a concern that work efficiency will decrease.

The present invention provides a linear guide with excellent assembly work efficiency.

The linear guide includes a guide rail having a pair of rolling element raceways, a base disposed on the guide rail, and extending from the base at intervals in the width direction of the guide rail, and comprising the pair of rolling element raceways. a slider having a pair of sleeves arranged facing each other; a plurality of rolling elements interposed between the pair of rolling element raceways and the pair of sleeves; a retainer to be held on the rolling element raceway; and a straightening member detachably attached to the slider; A groove is positioned between the pair of sleeves, and the correction member widens the width of the groove while being attached to the slider.

ADVANTAGE OF THE INVENTION According to this invention, the linear guide which is excellent in the work efficiency of an assembly can be provided.

It is a front view of an example of a linear guide for describing an embodiment of the present invention. FIG. 2 is a side view of the linear guide of FIG. 1; 2 is a schematic diagram for explaining a stroke of a slider of the linear guide of FIG. 1; FIG. 2 is a schematic diagram for explaining a stroke of a slider of the linear guide of FIG. 1; FIG. 2 is a schematic diagram for explaining a stroke of a slider of the linear guide of FIG. 1; FIG. FIG. 2 is a front view showing an exploded slider of the linear guide in FIG. 1; FIG. 2 is a side view showing an exploded slider of the linear guide in FIG. 1; FIG. 2 is a schematic diagram for explaining a method of applying a preload load to the linear guide of FIG. 1; 2 is a front view of a modification of the slider of FIG. 1; FIG. 2 is a side view of a variation of the slider of FIG. 1; FIG. FIG. 5 is a front view of another example of the linear guide for describing the embodiment of the present invention; FIG. 10 is a schematic diagram for explaining a method of applying a preload load to the linear guide of FIG. 9;

1 and 2 show an example of a linear guide for explaining an embodiment of the invention.

The linear guide 1 includes a guide rail 2, a slider 3 movable in the longitudinal direction of the guide rail 2, a plurality of rolling elements 4 interposed between the guide rail 2 and the slider 3, and a plurality of rolling elements 4. and a retainer 5 for holding.

The guide rail 2 has rail-side rolling element raceways 6 extending in the length direction of the guide rail 2 on both side surfaces in the width direction of the guide rail 2 .

The slider 3 has a base portion 7 arranged on the guide rail 2 and a pair of sleeve portions 8 extending from the base portion 7 at intervals in the width direction. The pair of sleeves 8 are arranged to face both lateral sides of the guide rail 2 in the width direction, that is, the pair of rail-side rolling element raceways 6 . A slider-side rolling-element raceway 9 is provided on the inner surface of the sleeve portion 8 facing the rail-side rolling-element raceway 6 .

The upper surface 10 of the base 7 on the side opposite to the lower surface of the base 7 facing the guide rail 2 is flat. A machine part such as a table installed on the upper surface 10 is screwed to the base 7 , and the upper surface 10 is provided with a plurality of screw holes 11 .

A plurality of rolling elements 4 are arranged in the length direction of the guide rail 2 on each side in the width direction of the guide rail 2 . The retainers 5 are provided on both sides of the guide rail 2 in the width direction, and each retainer 5 has a plurality of pockets 12 arranged in the length direction of the guide rail 2 . The pocket 12 accommodates the rolling element 4 in a rollable manner. The retainer 5 accommodates the rolling elements 4 in the pockets 12 and holds the rolling elements 4 on the rail-side rolling element raceways 6 .

In the examples shown in FIGS. 1 and 2, the rolling elements 4 are balls, but they may be rollers. Moreover, although the rolling elements 4 are arranged in two rows on each side in the width direction of the guide rail 2, they may be arranged in one row, or may be arranged in a double row of three or more rows.

In the example shown in FIGS. 1 and 2 the arrangement of rolling elements 4 and the cage 5 are longer than the slider 3 . In this case, some of the rolling elements 4 in each row are interposed between the rail-side rolling-element raceway 6 and the slider-side rolling-element raceway 9 of the sleeve portion 8 . An appropriate preload is applied between the guide rail 2 , the rolling elements 4 interposed between the rail-side rolling-element raceway 6 and the slider-side rolling-element raceway 9 , and the slider 3 .

3A to 3C show the stroke of the slider 3, and the rolling elements 4 interposed between the rail-side rolling-element raceway 6 and the slider-side rolling-element raceway 9 move along the rail-side rolling-element raceway 6 as the slider 3 moves. and roll on the slider-side rolling element raceway. These rolling elements 4 move rearward in the direction of movement of the slider 3 and escape from between the rail-side rolling-element raceway 6 and the slider-side rolling-element raceway 9 . On the other hand, the rolling elements 4 in front of the slider 3 enter between the rail-side rolling-element raceway 6 and the slider-side rolling-element raceway 9 . The arrangement of rolling elements 4 and the cage 5 move backwards in the direction of movement of the slider 3 , but forwards relative to the guide rails 2 .

Here, regarding the arrangement of the rolling elements 4 and the position of the slider 3 with respect to the retainer 5, the position of the slider 3 shown in FIG. If the position of the slider 3 is shifted from P0 to P1, which is shifted to the right, the rightward stroke of the slider 3 will be shorter than the stroke Sr shown in FIG. 3C. Further, the leftward stroke of the slider 3 is limited by the length of the guide rail 2 and is not necessarily extended. Therefore, in the linear guide 1, by changing the preload applied between the guide rail 2, the rolling elements 4, and the slider 3, the arrangement of the slider 3 and the rolling elements 4 and the positional relationship with the retainer 5 are assembled. It is configured so that it can be changed without modification.

4 and 5 show the slider 3 in exploded form.

A groove portion 13 is provided in the upper surface 10 of the base portion 7 of the slider 3 . The groove portion 13 is positioned between the pair of sleeve portions 8 in the width direction. The slider 3 has a key member 14 fitted into the groove portion 13 . The groove portion 13 extends from one end of the base portion 7 to the other end along the length direction, and the key member 14 also extends from one end of the base portion 7 to the other end along the length direction. there is The key member 14 is detachably fixed to the base 7 by bolts 15 .

The key member 14 is formed such that the width of the key member 14 is larger than the width of the groove portion 13 . Therefore, the key portion 14 is press-fitted into the groove portion 13 . Further, considering that a table or the like is installed on the upper surface 10 of the base portion 7, the key member 14 is formed so as to be entirely accommodated in the groove portion 13 (see FIG. 1). Preferably, the groove portion 13 and the key member 14 are formed in a tapered shape in which the width gradually decreases from the opening side of the groove portion 13 toward the bottom side in a cross section perpendicular to the length direction. This facilitates insertion of the key member 14 into the groove portion 13 . Note that in the tapered groove 13 and the key member 14 , the width of the key member 14 being larger than the width of the groove 13 means that at least the width of the lower surface 17 of the key member 14 facing the bottom surface 16 of the groove 13 is greater than the width of the groove 13 . It means larger than the width of the bottom surface 16 .

FIG. 6 shows a method of applying a preload load to the linear guide 1. As shown in FIG.

When the key member 14 is fitted into the groove portion 13 , the groove portion 13 is expanded in the width direction by the key member 14 . As the groove portion 13 on the upper surface side of the base portion 7 expands, the base portion 7 bends so as to protrude upward, and the distance between the pair of sleeve portions 8 positioned below the base portion 7 narrows. By narrowing the distance between the pair of sleeves 8, an appropriate preload is applied between the guide rail 2, the rolling elements 4, and the slider 3. As shown in FIG.

Conversely, when the key member 14 is removed from the groove portion 13, the preload is released. By removing the preload, the slider 3 can slide with respect to the rolling elements 4, and the arrangement of the slider 3 and the rolling elements 4 and the positional relationship between the cage 5 can be changed. As a result, even if the slider 3 is deviated from the proper position, the slider 3 can be arranged at the proper position without reassembling the linear guide 1, and the working efficiency is improved.

As shown in FIGS. 4 and 5, groove 13 preferably extends from one end of base 7 to the other. As a result, the deflection of the base portion 7 when the key member 14 is fitted into the groove portion 13 is not hindered, and a sufficient preload load can be applied between the guide rail 2, the rolling elements 4, and the slider 3.

Moreover, it is preferable that the groove portion 13 is positioned in the center between the pair of sleeve portions 8 in the width direction. As a result, the preload applied between the guide rail 2, the rolling elements 4, and the slider 3 is evenly distributed to both sides of the guide rail 2 in the width direction, and the slider 3 can operate smoothly.

Further, when the groove portion 13 and the key member 14 are tapered as shown in FIG. 4 , the height H of the key member 14 may be smaller than the depth D of the groove portion 13 . As a result, the preload applied between the guide rail 2, the rolling elements 4, and the slider 3 can be adjusted according to the press-fitting amount of the key member 14. FIG. The amount of press-fitting of the key member 14 can be controlled by, for example, the amount of tightening of the bolt 15 .

7 and 8 show modifications of the slider 3. FIG.

The key member 14A of the slider 3A shown in FIGS. 7 and 8 has a counterbore 19 for accommodating the head 18 of the bolt 15. As shown in FIG. The key member 14A is formed so as to be entirely housed in the groove portion 13, similarly to the key member 14 described above. With the key member 14A fixed to the base 7, the head 18 of the bolt 15 is housed in the counterbore 19, so that a machine part such as a table can be directly installed on the upper surface 10 of the base 7 without using a spacer. can.

FIG. 9 shows another example of the linear guide for describing the embodiment of the invention.

In the linear guide 1 described above, the groove 13 is expanded in the width direction by the key member 14 fitted in the groove 13 of the slider 3. However, in the linear guide 101 shown in FIG. The groove portion is expanded in the width direction by a mechanical part such as. In this point, the linear guide 1 described above is different from the linear guide 101 shown in FIG. Elements in the linear guide 101 that are common to the linear guide 1 described above are denoted by common reference numerals, and explanations thereof are omitted or simplified.

The linear guide 101 includes a guide rail 2, a slider 3 movable in the longitudinal direction of the guide rail 2, a plurality of rolling elements 4 interposed between the guide rail 2 and the slider 3, and a plurality of rolling elements 4. and a retainer 5 for holding. The guide rail 2 has rail-side rolling element raceways 6 extending in the length direction of the guide rail 2 on both side surfaces in the width direction of the guide rail 2 . The slider 3 has a base portion 7 arranged on the guide rail 2 and a pair of sleeve portions 8 extending from the base portion 7 at intervals in the width direction.

The upper surface 10 of the base 7 is flat, on which a mechanical part 114, such as a table for example, is mounted. A mechanical part 114 installed on the upper surface 10 is detachably fixed to the base 7 by bolts 115 . The mechanical component 114 is provided with at least a pair of fixing portions 116 through which bolts 115 are respectively inserted, and the base portion 7 is provided with at least a pair of screw holes 11 into which the bolts 115 are respectively screwed.

The pair of screw holes 11 are provided across the groove portion 13 in the width direction, and are provided with an interval W in the width direction. A pair of fixing portions 116 are also provided with an interval w in the width direction similarly to the pair of screw holes 11 . The spacing w between the pair of fixing portions 116 is greater than the spacing W between the pair of screw holes 11 .

FIG. 10 shows a method of applying a preload to the linear guide 101. As shown in FIG.

A mechanical part 114 is fixed to the base 7 of the slider 3 by means of a plurality of bolts 115 . Since the spacing w between the pair of fixing portions 116 through which the bolt 115 is inserted in the mechanical component 114 is larger than the spacing W between the pair of screw holes 11 in the base 7 with which the bolt 115 is screwed, the mechanical component fixed to the base 7 114 expands the groove portion 13 of the base portion 7 in the width direction. As the groove portion 13 on the upper surface side of the base portion 7 expands, the base portion 7 bends so as to protrude upward, and the distance between the pair of sleeve portions 8 positioned below the base portion 7 narrows. By narrowing the distance between the pair of sleeves 8, an appropriate preload is applied between the guide rail 2, the rolling elements 4, and the slider 3. As shown in FIG.

Conversely, when the mechanical component 114 is removed from the base 7, the preload is released. By removing the preload, the slider 3 can slide with respect to the rolling elements 4, and the arrangement of the slider 3 and the rolling elements 4 and the positional relationship between the cage 5 can be changed. As a result, even if the slider 3 is deviated from the proper position, the slider 3 can be arranged at the proper position without reassembling the linear guide 1, and the working efficiency is improved.

In the linear guides 1 and 101 described above, the arrangement of the rolling elements 4 and the retainer 5 are longer than the slider 3 , but the arrangement of the rolling elements 4 and the retainer 5 may be shorter than the slider 3 .

This specification describes at least the following matters.
(1) a guide rail having a pair of rolling element raceways;
A slider having a base disposed on the guide rail, and a pair of sleeves extending from the base with a gap in the width direction of the guide rail and disposed facing the pair of rolling element raceways. and,
a plurality of rolling elements interposed between the pair of rolling element raceways and the pair of sleeves;
a retainer that retains the plurality of rolling elements on the pair of rolling element raceways;
a correction member detachably attached to the slider;
with
The base has a groove on the upper surface opposite to the lower surface facing the guide rail,
The groove is located between the pair of sleeves,
(2) The linear guide according to (1) above, wherein the correction member widens the width of the groove while being attached to the slider,
The correction member is a key member detachably fitted into the groove,
The width of the key member is a linear guide larger than the width of the groove.
(3) The linear guide of (2) above,
The groove portion and the key member are formed in a tapered shape in which the width gradually decreases from the opening side of the groove portion toward the bottom side thereof.
(4) The linear guide of (2) or (3) above,
A linear guide in which the entire key member is accommodated in the groove.
(5) The linear guide of (4) above,
The key member is fixed to the base by a bolt and has a counterbore for accommodating the head of the bolt.
(6) The linear guide of (1) above,
The correcting member has at least a pair of fixing parts installed on the upper surface of the base and fixed to the base,
The base has at least a pair of fixed portions to which the at least a pair of fixed portions are fixed,
The at least one pair of fixed portions are provided across the groove portion in the width direction,
In the linear guide, the at least one pair of fixed portions is spaced from each other in the width direction larger than the at least one pair of fixed portions in the width direction.
(7) The linear guide according to any one of (1) to (6) above,
The groove is a linear guide extending from one end to the other end of the base along the length direction of the guide rail.
(8) The linear guide according to any one of (1) to (7) above,
The groove is a linear guide provided in the center between the pair of sleeves.

1 Linear guide 2 Guide rail 2
3 Slider 4 Rolling element 5 Cage 6 Rail-side rolling-element raceway 7 Base 8 Sleeve 9 Slider-side rolling-element raceway 10 Upper surface 11 of base Screw hole (a pair of fixed parts)
12 pocket 13 groove 14 key member (correction member)
15 bolt 16 bottom surface of groove 17 lower surface of key member 18 bolt head 19 counterbore 101 linear guide 114 machine part (correction member)
115 bolt 116 pair of fixing parts

Claims (8)

a guide rail having a pair of rolling element raceways;
A slider having a base disposed on the guide rail, and a pair of sleeves extending from the base with a gap in the width direction of the guide rail and disposed facing the pair of rolling element raceways. and,
a plurality of rolling elements interposed between the pair of rolling element raceways and the pair of sleeves;
a retainer that retains the plurality of rolling elements on the pair of rolling element raceways;
a correction member detachably attached to the slider;
with
The base has a groove on the upper surface opposite to the lower surface facing the guide rail,
The groove is located between the pair of sleeves,
The correction member is a linear guide that widens the width of the groove while being attached to the slider. A linear guide according to claim 1,
The correction member is a key member detachably fitted into the groove,
The width of the key member is a linear guide larger than the width of the groove. A linear guide according to claim 2,
The groove portion and the key member are formed in a tapered shape in which the width gradually decreases from the opening side of the groove portion toward the bottom side thereof. The linear guide according to claim 2 or 3,
A linear guide in which the entire key member is accommodated in the groove. A linear guide according to claim 4,
The key member is fixed to the base by a bolt and has a counterbore for accommodating the head of the bolt. A linear guide according to claim 1,
The correcting member has at least a pair of fixing parts installed on the upper surface of the base and fixed to the base,
The base has at least a pair of fixed portions to which the at least a pair of fixed portions are fixed,
The at least one pair of fixed portions are provided across the groove portion in the width direction,
In the linear guide, the at least one pair of fixed portions is spaced from each other in the width direction larger than the at least one pair of fixed portions in the width direction. A linear guide according to any one of claims 1 to 6,
The groove is a linear guide extending from one end to the other end of the base along the length direction of the guide rail. A linear guide according to any one of claims 1 to 7,
The groove is a linear guide provided in the center between the pair of sleeves.

Images