TW201540973A - Motion guiding apparatus - Google Patents

Abstract

A linear guide (1) includes an end plate (22) formed of combining an inner plate (40) with an outer plate (41) configured in an end face (21s) of a block body (21). The end plate (22) includes a position determining groove (51) to determine a position of the end plate (22), a plurality of position determining projection (52) configured in one of the inner plate (40) and the outer plate (41), and being capable to insert to the position determining groove (51), and a projection extending unit (53) configured in another of the inner plate (40) and the outer plate (41), engaged so to extend interval of the plurality of position determining projection (52), and pressing the plurality of position determining projection (52) into the position determining groove (51).

Description

Motion guiding device

The present invention relates to a motion guiding device.

The present application claims priority based on Japanese Patent Application No. 2014-031546, filed on Jan.

As the motion guiding device, for example, a linear guide or a ball spline is known. Such a motion guiding device has: a track body; a moving body movable along the track body; and a plurality of rolling bodies equal to rolling on an infinite loop path formed by the track body and the moving body. A rolling body direction conversion path is provided for the moving body to make the rolling body infinitely circulate. The rolling element direction changing path is formed inside the cover attached to the end surface of the moving body.

In the motion guiding device, when the cover body is attached to the end surface of the moving body body, it is necessary to have no step difference between the rolling element direction changing path formed in the cover body and the rolling portion rolling groove formed in the moving body body. In a manner, the cover body is accurately positioned with respect to the moving body body.

Patent Document 1 discloses a motion guiding device that is provided with a positioning portion on an inner side surface of a moving body body opposed to a rail body, and a cover body is provided to be engaged with the positioning portion to cover the cover member The body is positioned at a specific position of the positioning protrusion.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2005-98355

Since the rolling element direction changing path is curved, the cover system is formed by combining the rolling element direction switching inner circumference guiding portion and the rolling element direction switching outer circumference guiding portion.

In the previous configuration, after the outer peripheral guiding portion is rotated with respect to the positioning of the rolling body in the moving body body, the outer peripheral guiding portion is positioned to rotate the inner circumferential guiding portion with respect to the rolling body direction. Therefore, there is a case where the error of the parts is accumulated, and the positioning accuracy of the cover body with respect to the rolling element rolling grooves of the moving body body is lowered. Further, the inner peripheral guiding portion is switched in the rolling element direction, and a dialing portion that lifts the rolling element to the rolling element direction changing path is provided. Therefore, if the contact position between the rolling element and the plucking portion is deviated due to the accumulation of the component error, the frequency at which the rolling element hits the relatively weak portion increases, and in particular, the life of the component is easily shortened at the time of high-speed use. In order to reduce the accuracy of each part in order to reduce the accumulation of errors, it is necessary to increase the cost.

The present invention provides a motion guiding device that improves positioning accuracy of a cover body formed by combining two parts with respect to a moving body body, and is also capable of withstanding long-term high-speed use.

According to a first aspect of the present invention, a motion guiding device includes: a track body; a moving body movable along the track body; and a plurality of rolling bodies that are infinitely looped by the track body and the moving body Path scrolling. The moving body includes: a moving body; and a cover that is attached to an end surface of the moving body and forms a rolling element direction changing path of the infinite circulation path. The cover system combines the rolling element direction switching inner circumference guiding portion and the rolling element direction switching outer circumference guiding portion; and the motion guiding device has a positioning groove provided on the end surface of the moving body body for positioning the cover body a plurality of positioning projections provided in one of the rolling element direction switching inner circumference guiding portion and the rolling element direction switching outer circumference guiding portion, which can be inserted into the positioning groove; and the protrusion expansion The other one of the rolling element direction switching inner circumference guiding portion and the rolling element direction switching outer circumference guiding portion is engaged with the one of the plurality of positioning protrusions to expand the interval, and the above A plurality of positioning projections are pressed against the positioning grooves.

According to a second aspect of the present invention, in the motion guiding device of the first aspect, the protrusion expanding portion is provided closer to the front end than the end surface in the insertion direction of the plurality of positioning projections with respect to the positioning groove.

According to a third aspect of the present invention, in the motion guiding device of the first or second aspect, the slot has a slot formed around the plurality of positioning projections and recessed with respect to the end surface.

According to a fourth aspect of the present invention, in the motion guiding device of any of the first to third aspects, the protrusion expanding portion has a plurality of engagements with each of the plurality of positioning protrusions hole.

According to a fifth aspect of the present invention, in the motion guiding device of any of the first to third aspects, the protrusion expanding portion has an engaging projection pressed between the plurality of positioning projections.

According to a sixth aspect of the present invention, in the motion guiding device of any of the first to fifth aspects, the rolling element direction switching inner circumference guiding portion is formed in a gate shape, the positioning groove, and the plurality of The positioning projection and the projection expansion portion are provided at positions corresponding to the corner portions of the rolling element direction switching inner circumferential guide portion.

According to a seventh aspect of the present invention, in the motion guiding device of any of the first to fifth aspects, the rolling body direction changing path is disposed adjacent to the cover body, the positioning groove, the The plurality of positioning projections and the projection expansion portion are provided at positions corresponding to the adjacent rolling element direction changing paths.

According to an eighth aspect of the present invention, in the motion guiding device of any of the first to fifth and seventh aspects, the moving body body is provided with a load rolling body forming a part of the infinite loop path. a rolling groove, the positioning groove is disposed and formed The faces of the rolling elements of the load rolling elements are the same side.

The above-described motion guiding device can improve the positioning accuracy of the cover body formed by combining two parts with respect to the moving body body, and can withstand long-term high-speed use.

1‧‧‧Linear guides (motion guides)

2‧‧‧ bolt

10‧‧‧ Track track (track body)

11‧‧‧Side of the track rail

12‧‧‧ rolling element rolling groove

13‧‧‧Bolt mounting hole

14‧‧‧ Covering cover

20‧‧‧Slider (mobile body)

21‧‧‧ Block body (mobile body)

21s‧‧‧ end face

22‧‧‧End plate (cover)

23‧‧‧Track Housing Department

24‧‧‧ inside

25‧‧‧Load rolling element rolling groove

26‧‧‧Track Housing Department

27‧‧‧Bolt insertion hole

28‧‧‧ grease hole

28a‧‧‧Fat hole

28b‧‧‧ grease hole

29‧‧‧Fat tank

30‧‧‧ balls (rolling bodies)

31‧‧‧keeper

40‧‧‧Inner plate (rolling body direction conversion inner circumference guide)

40a‧‧‧Drops

41‧‧‧Outer board (rolling body direction conversion outer peripheral guide)

42‧‧‧ corner

50‧‧‧ Positioning Department

50a‧‧‧ Positioning Department

50b‧‧‧ Positioning Department

51‧‧‧ positioning slot

51a‧‧‧ positioning slot

51b‧‧‧ positioning slot

52‧‧‧ Positioning protrusion

52a‧‧‧Positioning projections

52b‧‧‧Positioning projections

53‧‧‧Protruding expansion

53a‧‧‧Protruding expansion

53b‧‧‧Protruding expansion department

54‧‧‧ slot

54a‧‧‧ slot

54b‧‧‧ slot

55‧‧‧Snap protrusion

56a‧‧‧ snap protrusion

56b‧‧‧ snap protrusion

57a‧‧‧ Pressed into the hole

57b‧‧‧ pressed into the slot

L‧‧‧Infinite loop path

L1‧‧‧Load rolling element rolling groove

L2‧‧‧Unloaded rolling element rolling path

L3‧‧‧ rolling body direction conversion path

Fig. 1 is a perspective view of a linear guide 1 according to a first embodiment of the present invention.

Fig. 2 is a partial cross-sectional view of the linear guide 1 according to the first embodiment of the present invention as seen from the front side.

Fig. 3 is a view of the end plate 22 in the first embodiment of the present invention as seen from the inner surface side.

Fig. 4 is an exploded perspective view of the end plate 22 in the first embodiment of the present invention.

Figure 5 is a cross-sectional view taken along line A-A of Figure 3;

Fig. 6 is a view for explaining the action of the positioning unit 50 in the first embodiment of the present invention.

Fig. 7 is a view of the end plate 22 in the second embodiment of the present invention as seen from the inner surface side.

Fig. 8 is an exploded perspective view of the end plate 22 in the second embodiment of the present invention.

Figure 9 is a cross-sectional view as seen in the direction of arrow B-B in Figure 7.

Fig. 10 is a view for explaining the action of the positioning portion 50a in the second embodiment of the present invention.

Fig. 11 is an enlarged view of a main part of an end plate 22 in a second embodiment of the present invention.

Fig. 12 is a view for explaining the action of the positioning portion 50b in the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, in the following description, a linear guide is exemplified as a motion guiding device.

(First embodiment)

Fig. 1 is a perspective view of a linear guide 1 according to a first embodiment of the present invention. Figure 2 is from A partial cross-sectional view of the linear guide 1 in the first embodiment of the present invention is observed on the front side.

As shown in Fig. 1, the linear guide 1 (motion guiding device) has a rail rail 10 (track body) and a slider 20 (moving body). Further, as shown in FIG. 2, the linear guide 1 has a plurality of balls 30 (rolling bodies).

As shown in Figure 1, the track rail 10 forms the track of the slider 20. The rail rail 10 is a member made of metal which is formed in a substantially rectangular shape in a cross section perpendicular to the longitudinal direction thereof. The center of the side portion 11 of the track rail 10 is recessed. On the upper side of the recessed portion, rolling element rolling grooves 12 extending in the longitudinal direction of the rail rail 10 are provided.

In the rail rail 10, a plurality of bolt mounting holes 13 penetrating in the thickness direction are formed at intervals in the longitudinal direction. The rail rail 10 is fixed to a base member (not shown) by a bolt (not shown) inserted into the bolt mounting hole 13. A shielding cover 14 for shielding bolts is attached to the opening edge of the bolt mounting hole 13 (the upper surface of the rail rail 10).

The slider 20 is movable along the track rail 10. The slider 20 has a block body 21 (moving body) and an end plate 22 (cover) attached to the end surface 21s of the block body 21. The block body 21 is formed in a rectangular parallelepiped shape. Each of the end faces 21s of the block main body 21 in the longitudinal direction thereof is attached with a flat end plate 22 by bolts 2.

In the linear guide rail 1, four infinite loop paths L having a ring-shaped long circular or elliptical ring shape are formed. The infinite loop path L is composed of a pair of linear portions extending in the longitudinal direction and a pair of semicircular arc curved portions connecting the ends of the pair of linear portions. As shown in FIG. 2, one of the linear portions is the load rolling element rolling path L1, and the other is the unloaded rolling element rolling path L2. The pair of semicircular arc curved portions are the rolling element direction changing paths L3 (refer to FIG. 3 described below).

The balls 30 are held to be rollable inside the infinite loop path L. The ball 30 is, for example, a spherical member containing a metal material. The ball 30 is interposed between the track rail 10 and the slider 20 (block body 21) so as to smoothly move the slider 20 with respect to the track rail 10.

A plurality of balls 30 are disposed inside the infinite loop path L with almost no gap, and circulate on the infinite loop path L. Through the plurality of balls 30, the slider 20 is freely reciprocally supported along the track rail 10.

The plurality of balls 30 are held at equal intervals by, for example, a strip-shaped holder 31. In the holder 31, a plurality of rectangular openings are formed at equal intervals in the longitudinal direction. A plurality of balls 30 are held by the holder 31 by accommodating the balls 30 in the rectangular opening.

The retainer 31 itself has an end shape, but is disposed on the infinite loop path L so that the both ends thereof are close to each other. Therefore, the plurality of balls 30 and the holder 31 are circulated together in an infinite loop path.

The block body 21 is formed in a gate shape having a C-shaped or U-shaped cross section. A rail accommodating portion 23 is formed on the bottom surface of the block body 21 in the longitudinal direction. The rail accommodating portion 23 accommodates the rail rail 10 with a slight gap therebetween.

A projecting portion is formed on the inner side surface 24 of one of the rail accommodating portions 23 so as to face the recessed portion of the side portion 11 of the rail rail 10. A load rolling element rolling groove 25 extending in the longitudinal direction is formed on the upper side of the protruding portion. A pair of load rolling element rolling grooves 25 are formed on one inner side surface 24. Therefore, four load rolling element rolling grooves 25 are formed in the block body 21.

The rolling element rolling groove 12 in the track rail 10 and the load rolling element rolling groove 25 in the block body 21 are arranged in a facing manner. A space (a space extending in the longitudinal direction) formed between the rolling element rolling groove 12 and the load rolling element rolling groove 25 serves as a load rolling element rolling path L1. Further, in the block main body 21, a load-free rolling element rolling path L2 is formed to penetrate in the longitudinal direction.

The unloaded rolling element rolling path L2 is formed in four corresponding to the four load rolling element rolling paths L1.

The end plate 22 is a flat resin molded member that is fixed to the end surface 21s of the block body 21. The end plate 22 is formed in the same shape as the block body 21 in a C-shaped or U-shaped cross section. A rail housing portion 26 is formed on the bottom surface of the end plate 22. In the track receiving portion 26, separated by a small gap The track rail 10 is housed.

A rolling element direction changing path L3 described below is formed on the inner surface of the end surface 21s of the block body 21 in close contact with the end plate 22. The rolling element direction changing path L3 connects the load rolling element rolling path L1 with the unloaded rolling element rolling path L2.

Fig. 3 is a view of the end plate 22 in the first embodiment of the present invention as seen from the inner surface side. Fig. 4 is an exploded perspective view of the end plate 22 in the first embodiment of the present invention. Figure 5 is a cross-sectional view taken along the direction of arrow A-A in Figure 3 . Fig. 6 is a view for explaining the action of the positioning unit 50 in the first embodiment of the present invention.

As shown in FIG. 3, the end plate 22 forms a rolling element direction changing path L3 of the infinite loop path L.

The rolling element direction changing path L3 is formed in four corresponding to the four load rolling element rolling paths L1 and the unloaded rolling element rolling path L2. Further, the end plate 22 is formed with a bolt insertion hole 27 through which the bolt 2 (see FIGS. 1 and 2) is inserted, and a grease supply hole 28 which is connected to a grease supply device (not shown) and supplies the lubricant from the outside. And a grease supply tank 29 communicating with the grease supply hole 28. The lubricant flowing through the grease supply tank 29 is supplied to the load rolling element rolling groove 25 of the block main body 21 and the like.

As shown in FIG. 4, the end plate 22 is configured by combining the inner plate 40 (the rolling element direction changing inner circumferential guiding portion) and the outer plate 41 (the rolling element direction changing outer circumferential guiding portion). The inner panel 40 forms an inner circumference of the rolling element direction changing path L3 having a semicircular arc shape. A dialing portion 40a for arranging the balls 30 from the load rolling element rolling path L1 is formed in the inner panel 40. Further, a grease hole 28a and a grease supply groove 29 are formed in the inner plate 40. The outer panel 41 forms an outer circumference of the rolling element direction changing path L3 having a semicircular arc shape. The outer plate 41 is formed with a bolt insertion hole 27 and a grease supply hole 28b that communicates with the grease supply hole 28a.

As shown in FIG. 5, the end plate 22 is attached by fixing the inner panel 40 to the end surface 21s of the block main body 21, and fixing the outer panel 41 so as to cover the outer side thereof. The positioning of the end plate 22 relative to the block body 21 is performed by the positioning portion 50. The positioning portion 50 has a positioning groove 51 and a positioning protrusion 52 And a protrusion expanding portion 53.

The positioning groove 51 is provided on the end surface 21s of the block body 21. The positioning groove 51 is formed to position the end plate 22 to the block body 21. In the present embodiment, the positioning groove 51 is formed by a circular hole. The positioning groove 51 is formed at a specific depth in a direction perpendicular to the end surface 21s.

As shown in FIGS. 4 and 5, the positioning projections 52 are provided on the outer panel 41 (one). The positioning projections 52 are provided on the outer panel 41 in plural numbers and are disposed at intervals. In the present embodiment, as shown in FIG. 3, the three positioning projections 52 are arranged in a circular shape at intervals of 120 degrees. Further, the end faces of the plurality of positioning projections 52 are formed in an arc shape. As shown in FIG. 5, the plurality of positioning projections 52 are formed with a length that can be inserted into the positioning groove 51.

The plurality of positioning projections 52 are configured to be elastically deformable at least in the diameter direction. The plurality of positioning projections 52 of the present embodiment are resin-molded integrally with the outer panel 41, and have a specific elasticity. Further, as shown in FIG. 5, a groove 54 recessed with respect to the end surface 21s is provided around the plurality of positioning projections 52. The slot 54 ensures the length of the positioning projection 52 and ensures a space in which the positioning projection 52 can be elastically deformed.

As shown in FIGS. 4 and 5, the projecting portion 53 is provided on the inner panel 40 (the other). The projection expansion portion 53 is engaged with the outer panel 41 so as to expand the interval between the plurality of positioning projections 52. The projection expanding portion 53 of the present embodiment has a plurality of engaging holes 55 that engage with each of the plurality of positioning projections 52. In the present embodiment, as shown in FIG. 3, three engagement holes 55 are provided corresponding to the three positioning projections 52. The engaging hole 55 is formed in an arc shape corresponding to the shape of the end surface of the positioning projection 52. Further, the engaging hole 55 is formed to be slightly larger than the positioning projection 52.

As shown in FIG. 3, the plurality of engaging holes 55 correspond to a plurality of positioning projections 52 arranged in a circular shape, and are disposed at intervals of 120 in the circumferential direction. Further, the engaging hole 55 is disposed on the outer side of the plurality of positioning projections 52 in the diameter direction. Therefore, when a plurality of positioning projections 52 are inserted into each of the plurality of engagement holes 55, a load that is pulled outward in the diametrical direction is applied to the plurality of positioning projections 52, so that the interval between the adjacent positioning projections 52 is expanded. As shown in FIG. 6, the protrusion expanding portion 53 is expanded to the positioning groove 51 by the front end of the plurality of positioning protrusions 52. The load is applied in a manner that the diameter is on the outside.

As shown in FIG. 5, the protrusion-expanding portion 53 is disposed closer to the front end 21s than the end surface 21s in the insertion direction of the plurality of positioning projections 52 with respect to the positioning groove 51. In other words, the projection expansion portion 53 is disposed closer to the end surface 21s of the block main body 21, and is disposed so as not to overlap with the positioning groove 51 in a direction parallel to the end surface 21s (the direction in which the paper is turned upside down in FIG. 5). In other words, the plurality of positioning projections 52 are sandwiched by the positioning groove 51 and the projection expanding portion 53 so that the inner side and the outer side do not overlap. Therefore, the plurality of positioning projections 52 are pressed against the positioning groove 51 with a specific elasticity.

As shown in FIG. 3, the positioning portion 50 is provided at a position corresponding to the corner portion 42 of the inner panel 40 formed in a gate shape, and is provided at two locations in the present embodiment.

Next, the action of the positioning unit 50 configured as described above will be described.

As shown in FIG. 5, the positioning portion 50 has a positioning groove 51 provided in the end surface 21s of the block body 21, a plurality of positioning projections 52 provided on the outer panel 41, and a projection expansion portion 53 provided on the inner panel 40. As shown in FIGS. 3 and 4, the projection expanding portion 53 is engageable with the outer panel 41, and the inner panel 40 and the outer panel 41 are positioned by the engagement of the projection expanding portion 53.

In the present embodiment, the projection expanding portion 53 has a plurality of engaging holes 55 that engage with each of the plurality of positioning projections 52. When each of the plurality of positioning projections 52 is engaged with each of the plurality of engagement holes 55, as shown in FIG. 6, each of the plurality of positioning projections 52 can be independently pushed outward in the diameter direction. Thus, by engaging one of the positioning projections 52 with one of the engaging holes 55, the shape stability of the plurality of positioning projections 52 when the deformation is expanded can be improved.

A plurality of positioning projections 52 are inserted into the positioning groove 51 at the front end. Therefore, the plurality of positioning projections 52 are pushed in the direction opposite to the pushing direction (outside in the diameter direction) (the inner side in the diameter direction: indicated by an arrow in FIG. 6). Further, a plurality of positioning projections 52 are pressed against the positioning grooves 51 by the elastic load to which they are pushed. Thereby, the positioning of the block body 21 and the outer panel 41 is performed. Here, the pressing of the plurality of positioning projections 52 to the positioning groove 51 is performed by the expansion of the projection expansion portion 53 of the inner panel 40. Therefore, the positioning of the outer panel 41 relative to the block body 21 can be considered as the positioning of the inner panel 40 relative to the block body 21.

Therefore, according to the positioning portion 50 configured as described above, the accumulation of errors in the inner panel 40 and the outer panel 41 with respect to the block body 21 can be reduced. Therefore, when the end plate 22 is attached to the end surface 21s of the block body 21, the rolling element direction switching path L3 formed in the end plate 22, the load rolling element rolling path L1 formed on the block body 21, and the unloaded rolling element rolling path can be formed. The connecting portion of L2 does not generate a step, and the end plate 22 is accurately positioned with respect to the block body 21. Further, the inner panel 40 is provided with a dialing portion 40a for lifting the balls 30 up to the rolling element direction changing path L3. However, since the component error accumulation is small, the contact position between the ball 30 and the dial portion 40a does not vary, and the life of the component becomes long even at high speed use.

Further, in the present embodiment, as shown in FIG. 5, the projection expanding portion 53 is provided closer to the front end 21s than the positioning groove 51. According to this configuration, it is possible to prevent the positioning groove 51 from overlapping the projection expanding portion 53, and to impart elasticity to the positioning projection 52. Thus, by imparting elasticity to the positioning projection 52 sandwiched between the positioning groove 51 and the projection expanding portion 53, the accumulation of component errors can be prevented and the positioning can be performed simply and surely, and only by embedding the components. All positions are determined, so the assembly becomes good.

Further, in the present embodiment, the slit 54 provided around the plurality of positioning projections 52 and recessed with respect to the end surface 21s is provided. According to this configuration, since the length of the positioning projection 52 can be ensured and the elastic deformation can be easily performed, even if the positioning projection 52 is sandwiched between the positioning groove 51 and the projection expanding portion 53, the elasticity can be sufficiently maintained.

Further, in the present embodiment, as shown in Fig. 3, the inner panel 40 is formed in a gate shape. In the inner panel 40, the positioning portion 50 having the positioning groove 51, the plurality of positioning projections 52, and the projection expanding portion 53 is provided at a position corresponding to the corner portion 42 of the inner panel 40. The corner portion 42 of the inner panel 40 is a relatively small portion of the deformation at the time of resin molding. That is, the inner panel 40 is easily deformed so that the two legs are opened or closed with the corner portion 42 as a fulcrum when the resin is molded. Therefore, the positioning portion 50 is provided at a position corresponding to the corner portion 42 (a position at which a fulcrum is formed). Thereby, the positioning accuracy can be further improved. Further, the slider 20 is also formed in a gate shape, and is also easily deformed in such a manner that the two legs are opened or closed with the corner as a fulcrum. Therefore, by the position corresponding to the corner portion 42 as described above By providing the positioning unit 50, the positioning accuracy can be further improved.

As described above, according to the present embodiment, the linear guide 1 has: a rail rail 10; a slider 20 which is movable along the rail rail 10; and a plurality of balls 30 which are equal to the rail rail 10 and the slider 20 The infinite loop path formed is scrolled on the L. The slider 20 has a block body 21 and an end plate 22 which is attached to the end surface 21s of the block body 21 and forms a rolling element direction changing path L3 of the infinite loop path L. The end plate 22 is formed by combining the inner plate 40 and the outer plate 41, and is provided on the end surface 21s of the block body 21. Moreover, the end plate 22 has a positioning groove 51 for positioning the end plate 22, and a plurality of positioning protrusions 52, which are disposed on one of the inner plate 40 and the outer plate 41, can be inserted into the positioning groove 51; The expansion portion 53, which is disposed on the other of the inner panel 40 and the outer panel 41, engages one of the plurality of positioning projections 52 in a manner to expand the interval therebetween, and presses the plurality of positioning projections 52 against the positioning slot. 51. According to this configuration, the linear guide rail 1 can be obtained in which the positioning accuracy of the end plate 22 in which the two components are combined with respect to the block main body 21 is improved, and the long-term high-speed use can be endured.

(Second embodiment)

Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

Fig. 7 is a view of the end plate 22 in the second embodiment of the present invention as seen from the inner surface side. Fig. 8 is an exploded perspective view of the end plate 22 in the second embodiment of the present invention. Figure 9 is a cross-sectional view as seen in the direction of arrow B-B in Figure 7. Fig. 10 is a view for explaining the action of the positioning portion 50a in the second embodiment of the present invention. Fig. 11 is an enlarged view of a main part of an end plate 22 in a second embodiment of the present invention. Fig. 12 is a view for explaining the action of the positioning portion 50b in the second embodiment of the present invention.

As shown in Fig. 7, in the second embodiment, the positioning portions 50a and 50b are different from the above-described embodiment. The positioning units 50a and 50b described below may be provided with only one of them.

As shown in FIG. 9, the positioning portion 50a has a positioning groove 51a, a positioning projection 52a, and a projection expanding portion 53a.

The positioning groove 51a is provided in a circular hole of the end surface 21s of the block body 21.

As shown in FIG. 8, the positioning projections 52a are provided on the inner panel 40 (one), and as shown in FIG. 7, a plurality of (three) are disposed at intervals. As shown in FIG. 9, the plurality of positioning projections 52a are formed with a length that can be inserted into the positioning groove 51a.

The plurality of positioning projections 52a are resin-molded integrally with the inner panel 40, and have a specific elasticity. Further, a groove 54a recessed with respect to the end surface 21s is provided around the plurality of positioning projections 52a.

As shown in FIG. 8, the projection expansion portion 53a is provided on the outer panel 41 (the other one). The projection expansion portion 53a is engaged with the inner panel 40 so as to expand the interval between the plurality of positioning projections 52a. The projection expanding portion 53a of the present embodiment has an engaging projection 56a that is press-fitted between the plurality of positioning projections 52a.

The inner plate 40 is provided with a press-fitting hole 57a into which the engaging projection 56a is press-fitted. As shown in Fig. 7, a plurality of positioning projections 52a are disposed around the press-fitting hole 57a. The engaging projection 56a has a shape slightly larger than that of the press-fitting hole 57a. Therefore, when the engagement projection 56a is press-fitted into the press-fitting hole 57a, a load that is pulled outward in the diametrical direction is applied to the plurality of positioning projections 52a, and the interval between the adjacent positioning projections 52a is expanded.

The positioning portion 50a is provided at a position corresponding to the corner portion 42 of the inner panel 40 in which the resin is formed into a gate shape. The positioning portion 50a is provided at two locations in the present embodiment.

According to the positioning portion 50a configured as described above, the projection expanding portion 53a has the engaging projection 56a that is press-fitted between the plurality of positioning projections 52. Therefore, when the engagement projection 56a is press-fitted into the press-fitting hole 57a, as shown in FIG. 10, each of the plurality of positioning projections 52a can be pushed outward in the radial direction. Thus, the interval between the plurality of positioning projections 52a can be expanded by the one engagement projection 56a, so that the structure of the projection expansion portion 53a can be simplified as compared with the above-described embodiment.

Further, since the front ends of the plurality of positioning projections 52a are inserted into the positioning grooves 51a, the plurality of positioning projections 52a are pushed in the opposite direction to the pushing direction (outside in the diameter direction) (the inner side in the diameter direction: indicated by an arrow in FIG. 10). In. The plurality of positioning projections 52a are pressed against the positioning groove 51b by the elastic load of the pushed-in degree. Therefore, according to the positioning portion 50a having the above configuration, as in the above-described embodiment, the accumulation of errors in the inner panel 40 and the outer panel 41 with respect to the block body 21 can be reduced.

On the other hand, as shown in FIG. 11, the positioning portion 50b has a positioning groove 51b, a positioning projection 52b, and a projection expanding portion 53b.

The positioning groove 51b is a substantially V-shaped groove extending from the end surface 21s in the longitudinal direction of the block body 21. As shown in FIG. 12, the positioning groove 51b is provided on the same surface as the surface on which the load rolling element rolling groove 25 is formed (the inner side surface 24 of the block body 21).

As shown in FIG. 8, the positioning projections 52b are provided on the inner panel 40 (one). As shown in Fig. 7, the positioning projections 52b are provided with a plurality of (two) spaced apart from each other. As shown in FIG. 11, the plurality of positioning projections 52b are formed to be insertable into the length of the positioning groove 51b. The plurality of positioning projections 52b are resin-molded integrally with the inner panel 40, and have a specific elasticity. Around the plurality of positioning projections 52b, a slit 54b recessed with respect to the end surface 21s is provided.

As shown in FIG. 8, the projection expansion portion 53b is provided on the outer panel 41 (the other). The projection expansion portion 53b is engaged with the inner panel 40 so as to expand the interval between the plurality of positioning projections 52b. The projection expanding portion 53b of the present embodiment has an engaging projection 56b that is press-fitted between the plurality of positioning projections 52b. The inner plate 40 is provided with a press-fitting groove 57b into which the engaging projection 56b is press-fitted. As shown in Fig. 12, the press-fitting groove 57b is formed in a substantially pentagonal shape, and is disposed such that the top of the pentagonal shape is inserted between the adjacent positioning projections 52b.

The engaging projection 56b has a shape slightly larger than that of the press-fitting groove 57b. Therefore, as shown in FIG. 11, when the engaging projection 56b is press-fitted into the press-fitting groove 57b, a load which is pulled outward in the radial direction is applied to the plurality of positioning projections 52b, and the interval between the adjacent positioning projections 52b is expanded.

As shown in FIG. 7, the positioning portion 50b is disposed in the end plate 22 and adjacent to the rolling body. The position corresponding to the transition path L3 is provided at two locations in the present embodiment.

According to the positioning portion 50b configured as described above, the projection expanding portion 53b has the engaging projection 56b that is press-fitted between the plurality of positioning projections 52. Therefore, when the engagement projection 56b is press-fitted into the press-fitting groove 57b, as shown in FIG. 12, each of the plurality of positioning projections 52b can be pushed outward in the radial direction. In this manner, since the interval between the plurality of positioning projections 52b is expanded by the one engagement projection 56b, the structure of the projection expansion portion 53b can be simplified similarly to the positioning portion 50a.

Further, the front end of the plurality of positioning projections 52b is inserted into the positioning groove 51b. Therefore, the plurality of positioning projections 52b are pushed in the direction opposite to the pushing-out direction (indicated by an arrow in FIG. 12), and are pressed against the positioning groove 51b by the elastic load of the pushed-in degree. Therefore, according to the positioning portion 50b having the above configuration, as in the above-described embodiment, the error accumulation of the inner panel 40 and the outer panel 41 with respect to the block body 21 can be reduced.

Further, in the present embodiment, as shown in Fig. 7, the end plate 22 is provided adjacent to the rolling element direction changing path L3, and the positioning portion 50b is provided between the adjacent rolling element direction changing path L3. position. According to this configuration, in the vicinity of the connection portion between the rolling element direction changing path L3 formed in the end plate 22 and the load rolling element rolling path L1 and the unloaded rolling element rolling path L2 formed in the block body 21, the block body 21 can be opposed to the block body 21. The end plate 22 is accurately positioned, and the small step difference at the connecting portion can be further reduced.

Further, in the present embodiment, as shown in FIG. 12, the positioning groove 51b is provided on the inner side surface 24 which is the same as the surface on which the load rolling element rolling groove 25 is formed. According to this configuration, the positioning groove 51b and the load rolling element rolling groove 25 can be simultaneously polished. Therefore, the inner panel 40 and the outer panel 41 can be accurately positioned with reference to the positioning groove 51b having the most precise polishing surface with the highest accuracy of the load rolling element rolling groove 25, and the structure without sway can be manufactured. Therefore, the contact position between the dial portion 40a and the ball 30 is stabilized, and the dial portion 40a can surely hit the ball 30 to the portion where the strength is secured, and the breakage of the dial portion 40a during high-speed use can be reliably prevented.

The above is a preferred embodiment of the present invention with reference to the drawings. However, the present invention is not limited to the above embodiment. The shapes and combinations of the respective constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the invention.

For example, in the above-described embodiment, the configuration in which the positioning groove 51 and the protrusion expanding portion 53 are overlapped is described. However, the present invention may employ the positioning protrusion 52 in a state in which the positioning groove 51 overlaps at least a part of the protrusion expanding portion 53. The composition of the sandwich.

Further, for example, in the above embodiment, the balls are used as the rolling elements, but the present invention may employ other rolling elements such as rollers.

Further, for example, in the above embodiment, the present invention has been described as applied to a linear guide rail, but the present invention is also applicable to other motion guiding devices such as ball splines.

Further, for example, the replacement and combination of the configurations of the above embodiments can be appropriately performed.

[Industrial availability]

The above-described motion guiding device can improve the positioning accuracy of the cover body formed by combining two parts with respect to the moving body body, and can also withstand long-term high-speed use.

1‧‧‧Linear guides (motion guides)

21‧‧‧ Block body (mobile body)

21s‧‧‧ end face

22‧‧‧End plate (cover)

29‧‧‧Fat tank

40‧‧‧Inner plate (rolling body direction conversion inner circumference guide)

41‧‧‧Outer board (rolling body direction conversion outer peripheral guide)

50‧‧‧ Positioning Department

51‧‧‧ positioning slot

52‧‧‧ Positioning protrusion

53‧‧‧Protruding expansion

54‧‧‧ slot

55‧‧‧Snap protrusion

L‧‧‧Infinite loop path

L3‧‧‧ rolling body direction conversion path

Claims (8)

A motion guiding device having: a track body; a moving body movable along the track body; and a plurality of rolling bodies that roll along an infinite loop path formed by the track body and the moving body; and the moving The body has a movable body and a cover attached to an end surface of the movable body and forming a rolling element direction changing path of the infinite circulation path; the cover system combined rolling element direction switching inner circumferential guiding portion and rolling element direction switching outer circumferential guiding And the movement guiding device has: a positioning groove disposed on the end surface of the moving body body for positioning the cover body; a plurality of positioning protrusions disposed on the rolling body direction conversion inner circumference guiding portion And one of the rolling element direction switching outer peripheral guiding portions and insertable into the positioning groove; and the protrusion expanding portion provided in the other of the rolling element direction switching inner circumference guiding portion and the rolling element direction switching outer circumference guiding portion Engaging the one of the plurality of positioning protrusions in a manner to expand the interval, and the plurality of positioning protrusions Pressing into the positioning groove. The motion guiding device of claim 1, wherein the protrusion expanding portion is disposed closer to the front end than the end surface in the insertion direction of the plurality of positioning protrusions with respect to the positioning groove. The motion guiding device of claim 1 or 2, which has a slot, which is disposed around the plurality of positioning protrusions and recessed with respect to the end surface. The motion guiding device according to any one of claims 1 to 3, wherein the protrusion expansion portion And a plurality of engaging holes that are engaged with each of the plurality of positioning protrusions. The motion guiding device according to any one of claims 1 to 3, wherein the protrusion expanding portion has an engaging projection pressed between the plurality of positioning projections. The motion guiding device according to any one of claims 1 to 5, wherein the rolling element direction changing inner circumference guiding portion is formed in a gate shape, and the positioning groove, the plurality of positioning projections, and the protrusion expanding portion are provided in the rolling element The direction shifts to a position corresponding to the corner of the inner peripheral guide. The motion guiding device according to any one of claims 1 to 5, wherein the cover body is adjacently provided with the rolling element direction changing path, and the positioning groove, the plurality of positioning protrusions, and the protrusion expanding portion are disposed in A position corresponding to the adjacent rolling element direction changing paths. The motion guiding device according to any one of claims 1 to 5, wherein the moving body body is provided with a load rolling element rolling groove forming a part of the infinite circulation path, and the positioning groove is disposed and formed The faces of the rolling elements of the load rolling elements are the same side.