JP2006153164A - Die for manufacturing rolling element storage belt, rolling element storage belt for linear guide device, and linear guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die for manufacturing a rolling element storage belt, preventing deterioration of the mechanical strength of a connection part caused by a weld part when manufacturing the rolling element storage belt for a linear guide device by injection molding. <P>SOLUTION: This die 70 manufactures by injection molding from a synthetic resin material 90, the rolling element storage belt 50 used for a linear guide 10 provided with an endless circulating passage 28 circulating while two or more balls 46 roll. The rolling element storage belt 50 is provided with spacers 51 intervened between adjacent balls 46, and a pair of connection parts 52 mutually connecting the spacers 51 on both the sides in a width direction in the endless circulating passage 28, and is formed to align the balls 46 in the line direction in the endless circulating passage 28. The gates 74 of the meal mold 70 are provided only to every odd number of the spacers 51 in the line direction from among the spacers 51. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rolling element housing belt manufacturing die, a rolling element housing belt for a linear motion guide device, and a linear motion guide device.

The linear motion guide device moves the slider relative to the guide rail via a plurality of rolling elements that circulate while rolling in an infinite circulation path.
However, in the linear motion guide device, when the slider moves relative to the guide rail, each rolling element moves while rotating in the same direction, so that adjacent rolling elements rub against each other and smooth rolling of the rolling elements occurs. Be disturbed. Therefore, noise increases and the progress of wear of the rolling elements is accelerated.

Therefore, conventionally, in order to suppress the generation of noise and smoothly operate the linear motion guide device, a rolling element housing belt that aligns the rolling elements in the arrangement direction in the infinite circulation path has been proposed (for example, Patent Documents). 1-3).
In the technique described in Patent Document 1, the rolling element housing belt is manufactured from a synthetic resin material by injection molding. And the spacer part which provided the recessed part in both surfaces is interposed between the adjacent rolling elements in an infinite circulation path. Adjacent spacer portions are connected to each other in the width direction of the endless circulation path by a pair of flexible connecting portions. And the rolling element accommodating part which accommodates a rolling element separately by the spacer part and a connection part is defined, and it can comprise a rolling element row | line | column. Thereby, friction and competition between rolling elements are suppressed, and the circulation property of the rolling elements is improved.
Japanese Patent No. 2607993 Japanese Patent No. 3447849 Japanese Patent Laid-Open No. 11-247856

By the way, since the connection part of this kind of rolling element accommodation belt receives repeated bending stress when it circulates in an infinite circulation path, it needs sufficient mechanical strength which can endure it.
Here, in the injection molding, the synthetic resin material is supplied into a space called a cavity from an injection molding gate (synthetic resin material inlet) provided in the mold. Then, the synthetic resin material filled in the cavity becomes a product. Usually, in the injection molding, a plurality of gates are provided in order to supply the synthetic resin material to the entire cavity. The synthetic resin materials supplied from the plurality of gates merge at a specific location in the cavity and are fused to each other. This fused portion is called a weld portion and appears as a thin linear portion in appearance.

However, in the weld portion, the fused synthetic resin materials are often not completely fused, and sufficient mechanical strength may not be obtained. For this reason, it is not desirable that the weld portion is formed at the connecting portion of the rolling element housing belt.
The present invention has been made paying attention to such a problem, and provides a die for manufacturing a rolling element housing belt that can avoid the formation of a weld portion at a connecting portion of the rolling element housing belt. The purpose is to do. Further, by manufacturing a rolling element accommodation belt for a linear motion guide device using this mold, a rolling element accommodation belt for a linear motion guide device that can prevent a decrease in mechanical strength of the connecting portion due to the weld portion and its rolling element. An object of the present invention is to provide a linear motion guide device provided with a moving body accommodation belt.

The inventor of the present application said that the synthetic resin materials respectively supplied from the gates of the molds merge at the locations where the flow distances in the cavities are approximately equal and are fused together to form a weld portion at that location. It came to solve the said subject paying attention.
That is, the invention according to claim 1 is for manufacturing a rolling element housing belt used for a linear motion guide device provided with an infinite circulation path in which a plurality of rolling elements circulate while rolling from a synthetic resin material by injection molding. The rolling element-accommodating belt includes a spacer portion interposed between adjacent rolling elements and a pair of the spacer portions that are connected to each other on both sides in the width direction in the endless circulation path. And connecting the rolling elements in the arrangement direction in the endless circulation path, and the gates of the molds are arranged at odd intervals between the spacers in the arrangement direction. It is provided only for the seat.

  According to the first aspect of the present invention, since the gate is provided in the mold for every odd number of spacers, the place in the cavity where the flow distances from adjacent gates are almost equal is the spacer. Has become a part. Therefore, a weld part can be intentionally formed in this spacer part. Thereby, it is avoided that a weld part is formed in the connection part of a rolling element accommodation belt.

The invention according to claim 2 is the die for manufacturing a rolling element containing belt according to claim 1, wherein the rolling element containing belt is formed in an end shape, and the gate of the die is It is provided with respect to each spacer part located in the both ends of the rolling element accommodation belt formed in the said end portion among spacer parts.
According to the second aspect of the present invention, since the gate is provided in the mold corresponding to the spacers located at both ends of the rolling element housing belt, the weld portion is connected to all the rolling element housing belts. Not formed in the part.

  According to a third aspect of the present invention, a rolling element housing belt used in a linear motion guide device including an infinite circulation path in which a plurality of rolling elements circulate while rolling is manufactured by injection molding from a synthetic resin material. The rolling element-accommodating belt includes a spacer portion interposed between adjacent rolling elements and a pair of the spacer portions that are connected to each other on both sides in the width direction in the endless circulation path. And a rolling element is accommodated in the rolling element accommodating part defined by the spacer part and the coupling part, and the rolling elements are aligned in the arrangement direction in the infinite circulation path. The gate of the mold is only at the center of each of the pair of connecting parts defining the even number of rolling element accommodating parts in the arrangement direction, or only at the center of each of the pair of adjacent connecting parts. It is characterized by being provided.

  According to the third aspect of the present invention, since the gate is provided in the mold for every even number or a pair of adjacent connecting portions, the place where the flow distances from the adjacent gates are almost equal. It is a spacer. Therefore, a weld part can be intentionally formed in this spacer part. Thereby, it is avoided that a weld part is formed in the connection part of a rolling element accommodation belt.

The invention according to claim 4 is the die for manufacturing a rolling element containing belt according to claim 3, wherein the rolling element containing belt is formed in an end shape, and the gate of the die is It is provided with respect to each of a pair of connection part located in the both ends of the rolling element accommodation belt formed in the said end shape among a pair of connection parts.
According to the invention described in claim 4, since the gate is provided in the mold for each of the pair of connecting portions located at both ends, the weld portion is formed for all the connecting portions of the rolling element containing belt. It is avoided.

The invention according to claim 5 is a rolling element accommodation belt for a linear motion guide device, which is manufactured using the rolling element accommodation belt manufacturing mold according to any one of claims 1 to 4. It is characterized by that.
According to the fifth aspect of the present invention, there is provided a rolling element containing belt for a linear motion guide device that exhibits the effect of the rolling element containing belt manufacturing mold according to any one of the first to fourth aspects. it can.

The invention according to claim 6 is a linear motion guide device, characterized in that it comprises the rolling element housing belt for linear motion guide device according to claim 5.
According to the invention described in claim 6, it is possible to provide a linear motion guide device that exhibits the effect of the rolling element housing belt for linear motion guide device according to claim 5.

  According to the present invention, it is avoided that a weld portion is formed in the connecting portion of the rolling element housing belt. Therefore, it is possible to provide a rolling element accommodation belt for a linear motion guide device and a linear motion guide device including the rolling element accommodation belt, which can prevent a decrease in mechanical strength of the connecting portion due to the weld portion.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a rolling element housing belt manufacturing die, a linear motion guide rolling element accommodation belt, and a linear motion guide apparatus including the rolling element accommodation belt according to the present invention will be described.
FIG. 1 is a perspective view showing a linear guide of a first embodiment of a linear motion guide device provided with a rolling element housing belt according to the present invention. 2 is a front view with the end cap of the linear guide of FIG. 1 removed, and FIG. 3 is a cross-sectional view of the linear guide of FIG.

As shown in FIGS. 1 and 2, the linear guide 10 includes a guide rail 12 having a rolling element guide surface 14 and a slider 16 straddling the guide rail 12 so as to be movable relative to the guide rail 12. And.
The guide rail 12 has a substantially square cross-sectional shape, and a total of four rolling element guide surfaces 14 are formed on each side of the guide rail 12 along the longitudinal direction.

As shown in FIG. 1, the slider 16 includes a slider body 17 and end caps 22 attached to both ends of the slider body 17 in the axial direction. The shape of the slider body 17 and the end cap 22 that are continuous in the axial direction is a substantially U-shaped cross-sectional shape.
As shown in FIG. 2, the slider body 17 has a substantially semicircular load rolling element guide surface facing the respective rolling element guide surfaces 14 of the guide rail 12 inside the substantially U-shaped sleeves. A total of 4 strips are formed. Further, as shown in FIG. 3, the end cap 22 is formed with a pair of direction change paths 24 respectively connected to both ends of the load rolling element guide surface 18. Further, as shown in FIGS. 2 and 3, the slider body 17 communicates with the pair of direction change paths 24, and is a rolling element return path formed of a through hole having a circular cross section parallel to the load rolling element guide surface 18. 20 is formed inside the sleeve.

As shown in FIG. 3, a space sandwiched between the rolling element guide surface 14 of the guide rail 12 and the load rolling element guide surface 18 of the slider body 17 facing the rolling member guide path 12 forms a rolling element track 26. ing. Then, a total of four infinite circulation paths 28 that are annularly continuous are formed by the pair of direction changing paths 24, the rolling element return paths 20, and the rolling element raceways 26.
Furthermore, as shown in the figure, each endless circulation path 28 is loaded with a plurality of balls 46 as rolling elements. The plurality of balls 46 in each endless circulation path 28 constitute a rolling element row 62 together with the rolling element accommodation belt 50 by the rolling element accommodation belt 50.

  The rolling element housing belt 50 is a belt that connects the spacers 51 interposed between the adjacent balls 46 in the endless circulation path 28, and the spacers 51 on both sides in the width direction of the endless circulation path 28. And a pair of connecting portions 52 in the form of a ring. In the rolling element housing belt 50, a space defined by the spacer portion 51 and the connecting portion 52 is a plurality of rolling element accommodating portions, and balls 46 are individually placed at predetermined intervals in the rolling element accommodating portion. The rolling elements are arranged in the endless circulation path 28 so that they can be arranged as rolling element rows 62. As shown in FIG. 2, the rolling element containing belt 50 has a groove-shaped guide portion in which a connecting portion 52 that projects in the width direction in the endless circulation path 28 is formed in the endless circulation path 28 in the slider 16. 60 is guided on both sides in the width direction.

Next, the rolling element accommodation belt 50 will be described in more detail.
4 and 5 are diagrams illustrating the rolling element housing belt 50. FIG. 4 (a) is a plan view showing the rolling element housing belt 50 in a developed state, and FIG. 4 (b) is a front view thereof. is there. FIG. 5 is an enlarged view of a part of the rolling element housing belt 50. FIG. 5 (a) is a plan view thereof, and FIG. 5 (b) is a front view thereof.

As shown in FIG. 4, the rolling element housing belt 50 is formed in an end shape, and the spacer portion 51 and the connecting portion 52 are integrally molded from a flexible synthetic resin material by injection molding. ing.
The connecting portion 52 is a thin and long belt-shaped member, and circular ball accommodation holes 55 for accommodating the balls 46 are formed side by side in the longitudinal direction. The ball receiving hole 55 is formed with an inner diameter that allows the ball 46 to freely engage and disengage in the front and back directions of the connecting portion 52.

  As shown in FIG. 5A, the spacer portion 51 is a short columnar member having an outer diameter smaller than the outer diameter of the ball 46. The spacer 51 has spherical concave curved surfaces 51a and 51b imitating the curved surfaces of adjacent balls 46 so as to face both ends of the short cylindrical shape in the direction in which the balls 46 are arranged in the endless circulation path 28. is doing. That is, the spacer 51 is disposed on both sides of each ball receiving hole 55 in the direction in which the balls 46 are arranged with respect to the connecting portion 52.

  Incidentally, a gate for injecting a molten synthetic resin material (hot water) into a molded product shape portion (cavity) is formed in an injection molding die. As shown in FIG. 4B, the gate setting position 53 is provided for every odd number K of spacers 51 in the arrangement direction. In the example of this embodiment, K = 1 is set. Has been. In the figure, the spacer 51 corresponding to the set position 53 of the gate is indicated by an arrow.

Specifically, as shown in an enlarged view in FIG. 5, the setting position 53 of each gate is substantially one of the front and back directions of the connecting portion 52 (upper side in the drawing) and the outer peripheral surface of the spacer portion 51 having a short cylindrical shape. It is provided for the central part. In particular, in this rolling element accommodation belt 50, the setting position 53 of the gate is provided in the spacer part 51 located in the both ends.
Here, the total number T1 of the spacers 51 of the rolling element housing belt 50 is set to satisfy the following expression (1). However, in Formula (1), T1 is the total number of spacers, N is a natural number, and K is an odd number of 1 or more.

T1 = N (K + 1) +1 (1)
That is, in the example of the present embodiment, K is set to 1 and N is set to 13, and the total number T1 of the spacers 51 is 27. By setting the total number T1 of the spacers 51 so as to satisfy this equation (1), the gate setting positions 53 are always set in the spacers 51 located at both ends of the rolling element housing belt 50.

Next, a rolling element accommodation belt manufacturing mold for producing the rolling element accommodation belt 50 will be described with reference to FIG. Since the injection molding itself is performed by a normal method, only the outline is briefly described.
A steel material is used for a rolling element housing belt manufacturing mold 70 (hereinafter simply referred to as “mold”) as a molding frame for the rolling element housing belt 50, and the mold 70 is shown in FIG. In addition, an upper die 71 and a lower die 72 are provided. The molded product shape portion 73 (cavity) is a male and female inverted shape formed relatively to the shape of the rolling element housing belt 50 that becomes the molded product (product), and the size is determined in consideration of the deformation amount and the like. ing. That is, the mold 70 is provided with a molded product shape portion 73 so that the above-described rolling element housing belt 50 can be formed, and a gate 74 is formed at a position corresponding to the set position 53 of the gate.

In the molding step, the synthetic resin material 90 (hot water) melted in the mold 70 is injected from the gate 74 into the molded product shape portion 73. Then, after the synthetic resin material 90 is solidified, the mold 70 is opened in the vertical direction to the upper mold 71 and the lower mold 72, and the molded body is obtained by taking out the rolling element containing belt 50 that is a molded product.
Next, the operation and effect of the rolling element accommodation belt 50 and the linear guide 10 provided with the rolling element accommodation belt 50 will be described.

FIG. 7 is a view for explaining the flow of the molten synthetic resin material 90 in the molded product shape portion 73 in the molding step, and the flow of hot water is indicated by arrows in the same drawing.
The synthetic resin materials 90 respectively supplied from the respective gates 74 are merged and fused to each other at locations where the flow distances in the molded product shape portion 73 are almost equal. A gate setting position 53 is provided for the seat portion 51, and a gate 74 is formed in the mold 70 at a corresponding position. Therefore, as shown in the figure, in this rolling element containing belt 50, the place where the flow distances from the adjacent gates 74 are substantially equal is the spacer portion 51 located between the adjacent gates 74, A weld 75 is generated at that location. That is, according to this rolling element accommodation belt 50, the weld part 75 can be intentionally formed in the spacer part 51 located between these adjacent gates 74.

Thereby, it is avoided that the weld part 75 is formed in the connection part 52 of the rolling element accommodation belt 50. Therefore, it is possible to provide the rolling element housing belt 50 capable of preventing the mechanical strength of the connecting portion 52 from being lowered by the weld portion 75 and the linear guide 10 including the rolling element housing belt 50.
In particular, in this rolling element housing belt 50, gate setting positions 53 are provided corresponding to the spacer portions 51 located at both ends thereof, and a gate 74 is formed in the mold 70 correspondingly. Has been. Thereby, the weld part 75 is not formed by all the connection parts 52 of the rolling element accommodation belt 50. Therefore, it is possible to more suitably provide the rolling element accommodation belt 50 capable of preventing the mechanical strength of the connecting portion 52 from being lowered by the weld portion 75 and the linear guide 10 including the rolling element accommodation belt 50.

  Furthermore, according to the present embodiment, all the gates 74 are arranged at regular intervals. For this reason, when the synthetic resin material 90 is injected, it is easy to evenly distribute the synthetic resin material 90 to all the gates 74. For this reason, molding defects such as the synthetic resin material 90 not reaching a specific location are unlikely to occur, and the rolling element containing belt 50 can be easily manufactured.

Next, a second embodiment of the present invention will be described. Since the second embodiment is different from the first embodiment described above only in the rolling element accommodation belt and the other configurations are the same, only the rolling element accommodation belt will be described. Description is omitted.
As shown in FIGS. 8 and 9, the rolling element housing belt 80 of the second embodiment is different from the first embodiment described above in the shape of the spacer 51.

  The connection part 82 of 2nd embodiment is formed similarly to said 1st embodiment. That is, the connecting portion 82 is a thin and long belt-shaped member, and circular ball accommodation holes 55 for accommodating the balls 46 are formed side by side in the longitudinal direction. The ball receiving hole 55 is formed with an inner diameter that allows the ball 46 to freely engage and disengage in the front and back direction of the connecting portion 82.

On the other hand, the spacer 81 is different from the first embodiment in that the pair of connecting portions 82 are connected to each other with the same thickness as the belt-shaped connecting portion 82 as shown in FIGS. It is formed as a connecting part. Therefore, in this example, the ball accommodation hole 55 is the rolling element accommodation portion as it is.
Here, in this rolling element accommodation belt 80, as shown in FIG. 8 (a), there are even G gate setting positions 83 formed in the injection molding die in the direction in which the ball accommodation holes 55 are arranged. It is provided with respect to a pair of connecting portions 82 that define every other ball receiving hole 55. In the example of this embodiment, G = 2 is set. In the figure, a pair of connecting portions 82 corresponding to the gate setting position 83 are indicated by arrows. Further, as shown in an enlarged view in FIG. 9, the setting positions 83 of the respective gates are provided on both side surfaces in the width direction of the connecting portion 82 and substantially the center portion of the connecting portion 82 in the arrangement direction of the ball receiving holes 55. It has been. In the rolling element housing belt 80, a gate setting position 83 is provided at a pair of connecting portions 82 located at both ends thereof.

Here, the total number T2 of the pair of connecting portions 82 of the rolling element housing belt 80 is set so as to satisfy the following expression (2). However, in Formula (2), T2 is the total number of a pair of connection part, N is a natural number, G is an even number of 2 or more.
T2 = N (G + 1) +1 (2)
That is, in the example of this embodiment, G is set to 2 and N is set to 9, and the total number T2 of the pair of connecting portions 82 is 28 sets. By setting the total number T2 of the pair of connecting portions 82 so as to satisfy the expression (2), the gate setting position 83 is always set to the pair of connecting portions 82 located at both ends of the rolling element housing belt 80. The

Even with the configuration of the second embodiment, the same operations and effects as those of the first embodiment are obtained.
That is, in the second embodiment, as described above, the gate setting position 83 is provided for the pair of connecting portions 82 that define every two ball receiving holes 55. Therefore, as shown in FIG. 9, in this rolling element housing belt 80, the synthetic resin material supplied from each gate of the mold has a place where the flow distances from adjacent gates in the cavity are almost equal. It becomes the seat part 81, and the weld part 85 is produced in that place. That is, according to this rolling element accommodation belt 80, the weld part 75 can be intentionally formed in the spacer part 81 similarly to said 1st embodiment.

Thereby, it is avoided that the weld part 85 is formed in the connection part 82 of the rolling element accommodation belt 80. Therefore, it is possible to provide the rolling element accommodation belt 80 capable of preventing the mechanical strength of the connecting portion 82 from being lowered by the weld portion 85 and the linear guide including the rolling element accommodation belt 80.
In particular, in this rolling element housing belt 80, gate setting positions 83 are provided corresponding to the pair of connecting portions 82 located at both ends thereof. As a result, the weld portion 85 is not formed by all the connecting portions 82 of the rolling element housing belt 80. Therefore, the rolling element accommodation belt 80 that can prevent the mechanical strength of the connecting portion 82 from being lowered by the weld portion 85 and the linear guide including the rolling element accommodation belt 80 can be more suitably provided.

  As described above, according to the rolling element housing belt manufacturing mold of each of the above embodiments, the weld portion can be intentionally formed in the spacer portion. Thereby, it is avoided that a weld part is formed in the connection part of a rolling element accommodation belt. And according to the rolling element accommodation belt manufactured using this metal mold | die and the linear guide provided with the rolling element accommodation belt, the fall of the mechanical strength of the connection part by a weld part can be prevented.

In addition, the rolling element accommodation belt manufacturing die, the rolling element accommodation belt for the linear motion guide device, and the linear motion guide device including the rolling element accommodation belt according to the present invention are not limited to the above embodiments. Various modifications can be made without departing from the spirit of the present invention.
For example, in each of the above embodiments, the linear guide 10 having the ball 46 as the rolling element is described as an example in which the rolling element accommodation belt for the linear motion guide device manufactured by the die for producing the rolling element accommodation belt according to the present invention is applied. However, the present invention is not limited to this, and the linear motion guide device can also be applied to a roller guide having a roller as a rolling element.

  Further, for example, in the first embodiment described above, an example in which the setting position 53 of the injection molding gate 74 of the mold 70 is provided for every other spacer portion 51 in the arrangement direction will be described. In addition, in the second embodiment, the setting position 83 of the injection molding gate of the mold is the center of the pair of connecting portions 82 that define every two ball receiving holes 55 in the arrangement direction. However, the present invention is not limited to this example.

  That is, in the rolling element containing belt manufacturing die according to the present invention, it is only necessary that the set position of the gate is set so that the weld portion can be intentionally formed in the spacer portion. Therefore, as long as there is no hindrance to the flow of hot water, for example, the setting position of the gate for injection molding is an odd number (for example, 3, 5,...) In addition to the above, the even number (for example, 4, 6,...) Of the ball accommodation holes 55 (rolling member accommodation portions) is defined in addition to 2 in the arrangement direction. It can be set as the structure each provided with respect to the center of a pair of connection part, or the center of all the pairs of connection parts. Even in such a configuration, a weld portion can be intentionally formed in the spacer portion, and a decrease in mechanical strength of the connecting portion due to the weld portion can be prevented.

  Or even when setting the gate for injection molding to every odd number of spacers in the arrangement direction, two or more different odd numbers can be combined. For example, as shown in a modified example in FIG. 10A, every other piece may be set at a certain place and every third piece at a certain place. With this configuration, the synthetic resin material is less likely to be evenly distributed to each gate. However, even if the total number of the spacers of the rolling element housing belt cannot satisfy the formula (1) due to restrictions such as the dimensions of the infinite circulation path, the mechanical parts of the connecting parts by the weld parts in all the connecting parts. It can be set as the structure which prevents the fall of intensity | strength. That is, it is possible to provide a rolling element housing belt that prevents a decrease in mechanical strength regardless of the dimensions of the infinite circulation path.

  Similarly, two or more different even numbers can be combined even when the gate for injection molding is set to every even number of connecting portions in the arrangement direction. In this case, some of the gates may be arranged in a connecting portion adjacent to each other. FIG. 10B shows an example in which gates are arranged adjacent to each other in every place and every two gates in some places. Also with this configuration, the same effect as that of the modified example of FIG.

  Moreover, in said 1st embodiment, the setting position 53 of the gate 74 for injection molding of the metal mold | die 70 with respect to each spacer part 51 located in the both ends formed in the end shape of the rolling element accommodation belt. In the second embodiment, the gate setting position 83 is provided at the center of the pair of connecting portions 82 that define the ball receiving holes 55 located at both ends. Although described in the example provided, it is not limited to this.

  For example, in the rolling element containing belt manufacturing die according to the present invention, as described above, even if no special consideration is given to the setting positions of the gates at both end portions formed in the end shape. In addition, a gate setting position is provided for every odd number K of spacers in the arrangement direction, or an even number of G ball receiving holes 55 (rolling element accommodation portions) are defined in the arrangement direction. By adopting a configuration in which the gate setting position is provided at the center of the pair of connecting portions, it is possible to prevent the mechanical strength of the connecting portion from being lowered by the weld portion in most connecting portions.

However, in all the connecting portions, in order to prevent the mechanical strength of the connecting portion from being lowered due to the weld portion, the gate setting positions at both ends formed in the end shape are as described above. It is desirable to have the mold configuration described in each embodiment.
That is, in order to obtain such a configuration, for example, in the first embodiment, the total number T1 of the spacers 51 of the rolling element containing belt 50 is set so as to satisfy the above formula (1). For example, in the second embodiment, the total number T2 of the pair of connecting portions 82 of the rolling element housing belt 80 is set so as to satisfy the above expression (2). However, these expressions (1) or (2) If the mold is configured so as to satisfy the condition of the formula, it is more preferable to obtain a rolling element housing belt that can prevent the mechanical strength of the connecting portion from being lowered by the weld portion.

  In the first embodiment, the shape of the rolling element housing belt 50 at the setting position 53 of the gate 74 is described as an example in which the gate is directly connected to the outer peripheral surface shape of the spacer 51. The configuration of the 74 setting positions 53 is not limited to this. For example, as shown in FIG. 11A, a flat portion 51a may be formed at the set position 53 of the spacer 51. Further, as shown in FIG. 11 (b), a recess 51b formed in a depression or a mortar shape around the set position 53 of the spacer 51 may be formed. If the gate 74 is provided for the flat portion 51a and the concave portion 51b formed as shown in FIGS. 11A and 11B, the gate marks after molding protrude from the outer periphery of the spacer portion 51. Therefore, there is an effect that no catching occurs during circulation in the endless circuit 28. It is needless to say that such a configuration can be similarly applied to the gate setting position 83 set in the connecting portion 82 in the second embodiment.

It is a perspective view which shows the linear guide of 1st embodiment of the linear guide apparatus provided with the rolling element accommodation belt which concerns on this invention. It is the front view which removed the end cap of the linear guide of FIG. It is sectional drawing in the XX line part in the linear guide of FIG. It is a figure explaining a rolling element accommodation belt, Drawing 4 (a) is a top view shown in the state where a rolling element accommodation belt was developed, and the figure (b) is the front view. It is explanatory drawing which expands and shows a part of rolling-element accommodation belt, The figure (a) is the top view, The figure (b) is the front view. It is a conceptual diagram for demonstrating the metal mold | die which manufactures the rolling element accommodation belt which concerns on this invention. It is a figure explaining the flow of the molten synthetic resin material in the molded article shape part in a formation process. It is explanatory drawing of 2nd embodiment of the rolling element accommodation belt which concerns on this invention. It is explanatory drawing of 2nd embodiment of the rolling element accommodation belt which concerns on this invention. It is a figure explaining the modification of the setting position of the gate of a rolling element accommodation belt. It is a figure explaining the modification of the spacer part in the setting position of the gate of a rolling element accommodation belt, and has shown in the figure which looked at the spacer part from the arrangement direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Linear guide 12 Guide rail 14 Rolling element guide surface 16 Slider 17 Slider main body 18 Load rolling element guide surface 20 Rolling element return path 22 End cap 24 Direction change path 26 Rolling element track 28 Endless circulation path 46 Ball (Rolling element)
50, 80 Rolling body accommodation belts 51, 81 Spacers 52, 82 Connection portions 53, 83 (Gate) set position 55 Ball accommodation hole (Rolling body accommodation portion)
60 Guide part 62 Rolling element row 70 Rolling element containing belt manufacturing mold 71 Upper mold 72 Lower mold 73 Molded product shape part (cavity)
74 Gate 75, 85 Weld part 90 Synthetic resin material

Claims (6)

A rolling element housing belt used in a linear motion guide device having an infinite circulation path in which a plurality of rolling elements circulate while rolling, is a mold for manufacturing by injection molding from a synthetic resin material,
The rolling element housing belt includes a spacer portion interposed between adjacent rolling elements, and a pair of connecting portions that mutually connect the spacer portions on both sides in the width direction in the endless circulation path. , Formed to align the rolling elements in the direction of alignment in the endless circuit,
The die for manufacturing a rolling element housing belt, wherein the gate of the mold is provided only for every odd number of spacers in the arrangement direction of the spacers. The rolling element housing belt is formed in an end shape,
The gate of the said metal mold | die is provided with respect to each spacer part located in the both ends of the rolling element accommodation belt formed in the said end | tip shape among the said spacer parts. The metal mold | die for manufacturing rolling element accommodation belts as described. A rolling element housing belt used in a linear motion guide device having an infinite circulation path in which a plurality of rolling elements circulate while rolling, is a mold for manufacturing by injection molding from a synthetic resin material,
The rolling element housing belt includes a spacer portion interposed between adjacent rolling elements, and a pair of connecting portions that mutually connect the spacer portions on both sides in the width direction in the endless circulation path. The rolling elements are accommodated in the rolling element accommodating portion defined by the spacer and the connecting portion, and the rolling elements are aligned in the alignment direction in the infinite circulation path,
The gate of the mold is only for the center of each of the pair of connecting parts defining the even number of rolling element housing parts in the arrangement direction, or only for the center of each of the pair of adjacent connecting parts. A die for manufacturing a rolling element housing belt, which is provided. The rolling element housing belt is formed in an end shape,
The gate of the mold is provided for each of a pair of connecting portions located at both ends of the endlessly formed rolling element housing belt among the pair of connecting portions. 4. A metal mold for producing a rolling element housing belt according to 3.   A rolling element accommodation belt for a linear motion guide device, wherein the rolling element accommodation belt is manufactured by using the rolling element accommodation belt manufacturing mold according to claim 1.   A linear motion guide device comprising the rolling element housing belt for the linear motion guide device according to claim 5.

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