JP2009108969A - Linear guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct a deflection in a middle retaining portion and to permit a longitudinal deviation when attaching a retainer comprising an upper side retaining portion, a lower side retaining portion, and the middle retaining portion to an end cap. <P>SOLUTION: A projection 5 is projected toward a guide rail 1 side in a position corresponding to a portion between upper and lower track surfaces 26 of a slider body 21 of the end cap 22. A long hole 7 into which the projection 5 of the end cap 22 is fitted is formed in a longitudinal end part of the middle retaining portion 4C of the retainer 4. An upper groove 8 and a lower groove 9 into which a tip pawl 44 of the upper side retaining portion 4A and a tip pawl 44 of the lower side retaining portion 4B are fitted are formed in the end cap 22. The projection 5 of the end cap 22 is fitted into the long hole 7 of the retainer 4. The tip pawl 44 of the upper retaining portion 4A is fitted into the upper groove 8 of the end cap 22. The tip pawl 44 of the lower side retaining portion 4B is fitted into the lower groove 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a linear guide device.

  The linear guide device includes a guide rail, a slider (also referred to as “bearing”), and a plurality of rolling elements. The guide rail and the slider have a rolling surface (a rolling groove when the rolling element is a “ball”) that are arranged to face each other and form a rolling path of the rolling element. The slider further includes a return passage of the rolling element, and a direction changing path that connects the return passage and the rolling passage. The rolling path, the return path, and the direction changing path constitute a circulation path of the rolling element, and the rolling element circulates in the circulation path so that one of the guide rail and the slider is relative to the other. Move in a straight line. The rolling element rolls while being held by the cage in the rolling path.

  In the slider of such a linear guide device, end caps are fixed to both ends of the slider body in the linear motion direction. The slider main body and the end cap include leg portions disposed on both sides in the width direction of the guide rail, and a trunk portion that extends in a direction orthogonal to the both leg portions and connects the both leg portions. The end cap is formed with an outer groove of the direction change path of the rolling element on the surface of the both sides of the slider body, and an oil supply port is formed on the body portion. The end cap is formed with an oil passage from the oil supply port toward the direction change passage.

The method of attaching the linear guide device to the slider of the cage is described in, for example, Patent Documents 1 and 2 below.
In Patent Document 1, an upper holding portion disposed above the upper rolling passage, a lower holding portion disposed below the lower rolling passage, and a lower portion and a lower portion of the upper rolling passage. The intermediate holding part disposed above the rolling passage is formed separately. Further, convex portions are provided at both ends in the length direction of the intermediate holding portion, and concave portions are provided at both length direction ends of the upper holding portion and the lower holding portion. Further, a concave portion for fitting the convex portion of the intermediate holding portion to the inner peripheral guide portion constituting member that protrudes from both longitudinal end surfaces of the slider main body and fits into the concave portion of the end cap, the upper holding portion, and the lower side Each convex part which fits each concave part of a holding | maintenance part is formed.

And by fitting the convex part of the intermediate holding part into the concave part of the inner peripheral guide part constituting member and fitting the concave part of the upper holding part and the lower holding part to the convex part of the inner peripheral guide part constituting member, Both ends of the retainer in the length direction are attached to the end cap via the circumferential guide portion constituting member.
In Patent Document 2, an upper holding portion disposed above the upper rolling passage, a lower holding portion disposed below the lower rolling passage, and a lower portion and a lower portion of the upper rolling passage. An intermediate holding portion disposed above the rolling passage is integrally formed. Protrusions are provided at both ends in the length direction of the upper holding part and the lower holding part. The retainer is attached to the end cap by engaging with the provided engaging claws.
JP 2002-54633 A JP 2005-180580 A

However, in the method of Patent Document 1 described above, since the cage is formed by injection molding of synthetic resin or the like, deformation due to swelling or contraction occurs. When the cage swells and the diameter becomes larger than the design value, the cage is attached in a bent state. On the other hand, when the cage contracts during contraction and the diameter becomes smaller than the design value, a gap is generated in the longitudinal direction after the cage is attached.
As in Patent Document 2, when the cage is an integral type, the intermediate holding portion is formed to have a larger cross-sectional area than the upper and lower holding portions, so the deformation rate during molding is large, and the dimension along the linear motion direction is It is formed longer than the upper and lower holding parts. As a result, the intermediate holding portion is bent with the end cap attached, and the rolling element falls when the slider is pulled out of the guide rail or inserted into the guide rail.

  An object of the present invention includes a slider, a guide rail, a rolling element, and a cage, and has a two-to-four row circulation path, and the cage includes an upper holding part that holds the upper part of the upper rolling element, and a lower side It consists of a lower holding part that holds the lower part of the rolling element and an intermediate holding part that holds the lower part of the upper rolling element and the upper part of the lower rolling element, and end caps are fixed to both ends of the slider body in the linear motion direction. In the linear guide device, the intermediate holding portion of the cage is prevented from being bent.

  In order to solve the above-mentioned problems, the present invention includes a slider, a guide rail, a rolling element, and a cage, has two-by-four circulation paths, and end caps are fixed to both ends of the slider body in the linear motion direction. In the linear guide device, a protrusion projecting toward the guide rail is formed at a position corresponding to the upper and lower raceway surfaces of the slider body of the end cap, and the cage is disposed above the upper rolling passage. An upper holding portion, a lower holding portion disposed below the lower rolling passage, and an intermediate holding portion disposed below the upper rolling passage and above the lower rolling passage. The retainer has an elongated hole into which the protrusion fits at the longitudinal end of the intermediate holding part, and the end cap has an upper groove into which the tip of the upper holding part fits and a lower groove into which the tip of the lower holding part fits Is formed in a state of penetrating in the linear motion direction. Fit the projection formed on the end cap into the long hole formed in the part, fit the tip of the upper holding part in the upper groove formed in the end cap, and fit the tip of the lower holding part in the lower groove A linear guide device is provided in which a vessel is attached to an end cap.

  According to this linear guide, the protrusion that protrudes toward the guide rail side of the end cap is fitted into the elongated hole provided in the end portion in the length direction of the intermediate holding portion of the cage, and penetrates the end cap in the linear motion direction. By fitting the tip of the upper holding portion into the upper groove formed in the above state and fitting the tip of the lower holding portion into the lower groove formed in the same state, the bending of the intermediate holding portion is corrected and the cage Is easily attached to the end cap. In addition, the end cap hole for fitting the intermediate holding portion is a long hole, and the upper and lower grooves of the end cap for fitting the upper holding portion and the lower holding portion are formed in a state of penetrating in the linear direction. Deviation is acceptable.

  According to the linear guide device of the present invention, the slider includes a guide rail, a rolling element, and a cage, and has a two-by-four circulation path, and the cage is disposed above the upper rolling passage. A slider body comprising a holding portion, a lower holding portion disposed below the lower rolling passage, and an intermediate holding portion disposed below the upper rolling passage and above the lower rolling passage. In the linear guide device in which the end caps are fixed to both ends of the linear motion direction of the guide, when the retainer is attached to the end cap, even if the intermediate holding part is formed longer than the upper and lower holding parts during molding, In addition to correcting the deflection of the part, a deviation in the length direction can be allowed.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a front view showing an embodiment of the linear guide device of the present invention.
As shown in FIG. 1, the linear guide device includes a guide rail 1, a slider 2, a cylindrical roller (rolling element) 3, a holding piece 31, and a cage 4. The slider 2 has end caps 22 fixed to both ends of the slider body 21 in the linear motion direction. The end cap 22 has a roller insertion opening. In the right half of FIG. 6 shows a closed state.

The left half of FIG. 1 shows a state where the end cap 22 is removed from the slider body 21. The through hole 24 in the leg portion of the end cap 22 communicates with the screw hole 24 a of the slider body 21. The through hole 25 in the body portion of the end cap 22 communicates with the screw hole 25 a of the slider body 21. The recess 25b around the through hole 25 is for accommodating the head of the mounting bolt when the end cap 22 is fixed to the slider body 21.
Fig.2 (a) is a side view of a holder | retainer, FIG.2 (b) is AA sectional drawing of Fig.2 (a). FIG. 3 is a view showing the arrangement of the holding piece and the cylindrical roller, as viewed from the axial end face side of the cylindrical roller. FIG. 4A is a view showing the right half of the end cap formed symmetrically, and FIG. 4B is a view taken in the direction of arrow A in FIG.

As shown in these drawings, the retainer 4 includes an upper holding portion 4A, a lower holding portion 4B, and an intermediate holding portion 4C that are integrally formed. The upper holding portion 4 </ b> A is a portion arranged above an upper rolling passage 27 a formed by the upper rolling surface 11 of the guide rail 1 and the upper rolling surface 26 of the slider body 21. The lower holding portion 4B is a portion disposed below a lower rolling passage 27b formed by the lower rolling surface 11 of the guide rail 1 and the lower rolling surface 26 of the slider body 21. is there. The intermediate holding portion 4C is a portion disposed below the upper rolling passage 27a and above the lower rolling passage 27b.
The retainer 4 is formed with an upper pocket 41 and a lower pocket 42 for inserting the cylindrical rollers 3, and a guide groove 43 for guiding the arm portion 31 b of the retaining piece 31. And the elongate hole 7 which the protrusion 5 of the end cap 22 fits is formed in the length direction both ends of the intermediate | middle holding | maintenance part 4C of the holder | retainer 4. As shown in FIG. Examples of the material of the cage 4 include POM.

As shown in FIG. 3, the holding piece 31 includes a main body 31 a having an arc surface 311 that comes into contact with the circumferential surface of the cylindrical roller 3, and arm portions 31 b that are disposed on both axial end surfaces of the cylindrical roller 3. When the cylindrical rollers 3 are placed in the circulation path, the holding pieces 31 and the cylindrical rollers 3 are alternately inserted so that the holding pieces 31 are interposed between the adjacent cylindrical rollers 3. In the rolling passages 27 a and 27 b, the cylindrical roller 3 is guided by the arc surface 311 of the holding piece 31 to roll on the rolling passage, and the arm portion 31 b of the holding piece 31 is inserted into the guide groove 43 of the cage 4. The holding piece 31 moves while being guided.
As shown in FIG. 4, the end cap 22 has a protrusion 5 that protrudes toward the guide rail 1 at a position corresponding to the space between the upper and lower raceway surfaces 26 formed on the slider body 21. . Note that reference numeral 15 in FIG. 4 denotes a tongue portion formed on the end cap 22.

In the end cap 22, an upper groove 8 into which the tip claw portion 44 of the upper holding portion 4A of the cage 4 is fitted and a lower groove 9 into which the tip claw portion 44 of the lower holding portion 4C is fitted penetrate in the linear motion direction. It is formed in the state. 1 and FIG. 4A is a cylindrical protrusion for positioning the side seal.
Accordingly, the projection 5 of the end cap 22 is fitted into the elongated hole 7 of the cage 4, the tip claw portion 44 of the upper holding portion 4 A of the cage 4 is fitted into the upper groove 8 of the end cap 22, and the cage 4 is fitted into the lower groove 9. By fitting the tip claw portion 44 of the lower holding portion 4B, the bending of the intermediate holding portion 4C is corrected, and the cage 4 is easily attached to the end cap 22.

Moreover, the hole of the intermediate holding part 4C in which the protrusion 5 of the end cap 22 is fitted is a long hole 7, and the upper groove 8 and the lower groove 9 of the end cap 22 in which the upper holding part 4B and the lower holding part 4B are fitted penetrate in the linear motion direction. By forming in this state, even when the intermediate holding part 4C is formed longer than the upper and lower holding parts 4A, 4B during molding, a deviation in the length direction can be allowed.
In this embodiment, the retainer 4 in which the upper holding portion 4A, the lower holding portion 4B, and the intermediate holding portion 4C are integrally formed is used, but the upper holding portion 4A, the lower holding portion 4B, You may use the holder | retainer which consists of three members which do not integrate the intermediate | middle holding | maintenance part 4C.

5 to 7 are views when the cage is not integrated. FIG. 5 is a front view in which the upper holding portion 4A, the lower holding portion 4B, and the intermediate holding portion 4C are attached to the end cap 22A, respectively. FIG. FIG. 6A is a front view showing the end cap 22A in this case, and FIG. FIG. 7 is a side view (a) and a BB cross-sectional view (b) showing the upper holding portion 4A, the lower holding portion 4B, and the intermediate holding portion 4C, respectively.
In this example, since the upper holding portion 4A, the lower holding portion 4B, and the intermediate holding portion 4C are individual members, unlike FIG. 4, the front surface of the tongue 15A is the same as the front surface of the end cap 22A. It has become. Except for this point, the structure is the same as the example shown in FIGS. 1 to 4 and the same effect can be obtained.

It is a front view which shows embodiment of the linear guide apparatus of this invention. (A) is a side view of a cage, (b) is an AA cross-sectional view thereof. It is a figure which shows arrangement | positioning of a holding piece and a cylindrical roller, and is the figure seen from the axial direction end surface side of the cylindrical roller. They are the figure (a) which shows the right half of the end cap currently formed symmetrically, and its A arrow directional view (b). It is an example in case a holder | retainer is not integrated, Comprising: It is a front view which shows the state which each holding | maintenance part attached to the end cap. It is an example in case a holder | retainer is not integrated, Comprising: It is the front view (a) which shows an end cap, and its B arrow directional view (b). It is an example in case a holder | retainer is not integrated, Comprising: It is the side view (a) which shows an upper side holding part, a lower side holding part, and an intermediate | middle holding part, respectively, and its BB sectional drawing (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guide rail 11 Guide rail track surface 2 Slider 21 Slider main body 22 End cap 22A End cap 24 Leg through hole 24a Screw hole 25 Trunk through hole 25a Screw hole 25b Recess 26 Slider main track surface 27a Upper rolling Moving path 27b Lower rolling path 3 Cylindrical roller (rolling element)
31 Holding piece 31a Holding piece main body 31b Holding piece arm 311 Arc surface of holding piece main body 4 Cage 4A Upper holding portion 4B Lower holding portion 4C Intermediate holding portion 41 Upper pocket 42 Lower pocket 43 Guide groove 44 Upper and Tip nail part of lower holding part 5 Protrusion 6 Roller cover 7 Long hole 8 Upper groove 9 Lower groove

Claims (1)

In a linear guide device comprising a slider, a guide rail, rolling elements and a cage, having a two-by-four circulation path, and having end caps fixed at both ends in the linear motion direction of the slider body,
A protrusion that protrudes toward the guide rail is formed at a position corresponding to the upper and lower raceway surfaces of the slider body of the end cap,
The cage includes an upper holding portion disposed above the upper rolling passage, a lower holding portion disposed below the lower rolling passage, and lower and lower rolling portions of the upper rolling passage. Consisting of an intermediate holding part arranged above the movement path,
An elongated hole into which the projection of the end cap fits is formed at the longitudinal end of the intermediate holding portion of the cage,
In the end cap, an upper groove into which the tip of the upper holding part fits and a lower groove into which the tip of the lower holding part fits are formed in a state penetrating in the linear motion direction,
The protrusion formed on the end cap is fitted into the elongated hole formed in the intermediate holding portion of the cage, and the tip of the upper holding portion is fitted in the upper groove formed in the end cap, and the tip of the lower holding portion is fitted in the lower groove. A linear guide device in which the cage is attached to the end cap by fitting.

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