JP6651412B2 - Rolling guide device - Google Patents

Description

  The present invention relates to a rolling guide device that guides a movable body such as a table in a reciprocating manner on a work table of a machine tool or a linear guide section or a curved guide section of various transport devices.

  Conventionally, this type of rolling guide device is assembled to the raceway member via a raceway member having a rolling surface of a rolling element formed along a longitudinal direction, and a number of rolling elements rolling on the rolling surface. And a movable member reciprocally movable along the track member. The moving member has an endless circulation path of the rolling element, so that the moving member can move along the track member without limiting the stroke.

  In the rolling guide device disclosed in Patent Literature 1, the moving member includes a metal main body member, a plurality of circulation path assemblies mounted on the main body member, and the moving member so as to cover the circulation path assemblies. A pair of lids attached to the main body member. A load rolling surface facing the rolling surface of the track member is formed on the main body member, and the rolling elements roll in a load passage defined by the rolling surface and the load rolling surface facing each other. . Further, each of the circulation path assemblies mounted on the main body member has a pipe portion inserted into a through hole formed in the main body member, and is provided at one end of the pipe portion and has an end face in the moving direction of the main body member. A direction change portion to be arranged.

  A return path of the rolling element parallel to the load path is formed in the pipe portion, and a direction change path connecting the return path and the load path is built in the direction change section. The lid is configured to cover a direction change portion of the circulation path assembly, and by attaching the lid to a main body member, the circulation path assembly allows the pipe section to pass through the through hole of the main body member. In a state of being inserted into the body member, and the infinite circulation path of the rolling element is completed.

  An endless circulation path of the rolling element, a load path in which the rolling element rolls while applying a load between a track member and a moving member, and a return path of the rolling element provided in parallel with the load path, The load passage and the return passage are constituted by a pair of direction change paths connecting ends thereof, and each direction change path is formed in a substantially semicircular shape to change the rolling direction of the rolling element by 180 °. Have been. Further, the return passage and the direction change path are configured as unloaded passages in which the rolling elements roll while being released from the load, and the widths of these paths are formed to be larger than the diameter of the rolling elements.

  For this reason, when the moving member moves along the track member, the rolling elements in the load passage move while rotating in the load path, but when the rolling elements are discharged from the load path to the direction change path, Instead of rotating by itself, it moves inside the turning path and the return path while being pushed by the subsequent rolling element continuously discharged from the load path. That is, the rolling elements are arranged without gaps along the circulation direction in the no-load passage composed of the return passage and a pair of direction change passages located at both ends thereof.

  At this time, since the discharge of the rolling elements from the load path to the no-load path and the entry of the rolling elements from the no-load path to the load path are not completely synchronized, the length of the rolling element row in the no-load path Is periodically repeating a minute change. When the spacers are arranged between the rolling elements, the spacers can be elastically deformed to absorb the periodic change in length. When the rolling elements are arranged in the passage without gaps, the rolling elements receive a large frictional resistance, causing a clogging phenomenon in the passage, and there is a concern that the smooth circulation of the rolling elements is hindered. Such a clogging phenomenon was remarkable when a roller was used as the rolling element.

JP 2013-190021 A

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a structure in which the rolling elements receive a large frictional resistance even when the rolling elements are arranged without a gap in the no-load passage. Accordingly, it is an object to provide a rolling guide device capable of ensuring smooth circulation of the rolling elements without causing a clogging phenomenon in the passage and thereby achieving a smooth movement of the moving member with respect to the track member. .

  That is, the present invention includes a track member having a rolling surface of a rolling element along a longitudinal direction, and a return path and a direction change path of the rolling element that are assembled to the track member via a number of rolling elements. A rolling guide device including a moving member having an infinite circulation path, wherein the moving member covers a main body member, a plurality of circulation path forming members attached to the main body member, and the circulation path forming member. And a pair of lids attached to the main body member as described above. The circulation path forming member includes a combination of a first circulation half and a second circulation half, has the return path, and has a pipe portion inserted into a through hole of the main body member, and the direction change path. And a direction changing portion provided at one end of the pipe portion and disposed on an end surface of the main body member in the moving direction. An elastically deforming portion which is pressed by a rolling element in the return passage and is appropriately deformed is provided at a longitudinal center of the pipe portion of the circulation path forming member. A pair of cylindrical fixing portions are formed with the deforming portion interposed therebetween, and the direction changing portion and the pair of fixing portions are formed on the plane including the center line of the direction changing path by the first circulation half and the second circulation portion. While being divided into halves, the elastically deformable portion is divided into the first circulating half and the second circulating half on a plane orthogonal to a plane including a center line of the turning path.

  According to the present invention, the circulation path forming member having the return path and the direction change path of the rolling element is divided into the first circulation half and the second circulation half. It is possible to ensure smooth circulation of the rolling elements while minimizing the number of parts constituting the member. In addition, even if the rolling elements arranged in the infinite circulation path receive a large frictional resistance due to a minute change in the length of the rolling element row in the infinite circulation path, the elastically deformable portion is prevented from rolling in the return path. Since the width of the return passage is expanded by being pressed by the moving body, the clogging phenomenon in the endless circulation path can be prevented, and the smooth rolling of the rolling body can be ensured. It is possible to achieve a smooth movement of the moving member.

  In order to facilitate the formation of the direction change path with respect to the circulation path forming member, and to effectively prevent the occurrence of a clogging phenomenon of the rolling elements in the return path, the direction change section and the pair of fixing sections are each Although the first circulation half and the second circulation half are divided by a plane including the center line of the direction change path, the elastic deformation portion is a plane orthogonal to a plane including the center line of the direction change path. The first circulation half and the second circulation half are divided, and only the combination of the first circulation half and the second circulation half includes the elastic deformation portion with respect to the circulation path forming member. It is possible to do.

It is a perspective view showing an example of an embodiment of a rolling guidance device to which the present invention is applied. FIG. 2 is a sectional view taken along line II-II of FIG. 1. It is a perspective view showing a main part member of a rolling guidance device concerning an embodiment. It is a perspective view showing the circulation way formation member of the rolling guide device concerning an embodiment. It is a perspective view showing the state where a circulation way formation member was attached to a main part member. FIG. 5 is an exploded perspective view of the circulation path forming member illustrated in FIG. 4 when viewed from a first half body side. FIG. 5 is an exploded perspective view of the circulation path forming member illustrated in FIG. 4 when viewed from a second half side. It is sectional drawing which shows the arrangement state of the rolling element in a pipe part. It is the schematic explaining the effect | action of the elastic deformation area | region in a pipe part.

  Hereinafter, the rolling guide device of the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 show an example of an embodiment of a rolling guide device to which the present invention is applied. The rolling guide device is mounted on the track member 2 via a plurality of rollers 1 and a track member 2 having a rolling surface 20 of a roller 1 as a rolling element formed along a longitudinal direction. And a moving member 3 having a built-in infinite circulation path. The moving member 3 can freely move along the longitudinal direction of the track member 2 by rolling the rolling surface 20 of the track member 2 while the roller 1 circulates in the endless circulation path. It has become. The rolling guide device of the present invention may use a ball as the rolling element.

  The track member 2 is formed in a rectangular cross section, and two rolling surfaces 20 of the roller 1 are formed on both side surfaces thereof, and four rolling surfaces 20 are formed in the entire track member 2. Have been. Also, mounting holes 22 for fixing bolts are formed in the track member 2 at predetermined intervals along the longitudinal direction, and are used when laying the track member 2 in a mechanical device or the like. In addition, the arrangement of the rolling surface 20 with respect to the track member 2, the inclination angle and the number thereof may be appropriately changed according to the load capacity required for the moving member 3.

  On the other hand, the moving member 3 includes a main body member 4 having a guide groove for accommodating a part of the track member 2, a pair of lids 5 attached before and after in a moving direction of the main body member 4, 4 and a circulation path forming member 6 which is covered from the outside by the lid 5. The details of the circulation path forming member 6 will be described later.

  The main body member 4 includes a horizontal portion 4a on which a mounting surface 41 of a mechanical device or the like is formed, and a pair of legs 4b orthogonal to the horizontal portion 4a. It is arranged. The mounting surface 41 is formed on the horizontal portion 4a, and two load rolling surfaces 42 on which the roller 1 rolls are formed inside each leg 4b. The rolling surface 20 of the track member 2 and the load rolling surface 42 of the main body member 4 face each other, and the load passage 43 in which the roller 1 rolls while applying a load between the main body member 4 and the track member 2. Is configured. In each leg 4b, a return passage 44 for the roller 1 corresponding to each load rolling surface 42 is formed in parallel with the load passage 43. The return passage 44 is provided in the circulation path forming member 6. By inserting a part of the circulation path forming member 6 into a through hole 45 formed in the main body member 4, the return path 44 is formed in the main body member 4. On the other hand, a return passage 44 is provided.

  In addition, the circulation path forming member 6 constitutes a direction change path 60 connecting the load passage 43 and the return passage 44 in combination with the lid 5. By connecting both ends of each load passage 43 described above and both ends of the corresponding return passage 44 with a pair of direction change paths 60, an infinite circulation path of the roller 1 is constructed inside the moving member 3. As shown by broken lines in FIG. 2, each load passage 43 is connected to the return passage 44 located diagonally downward or diagonally upward by the direction change path 60, and is constructed in each leg 4b of the main body member 4. In the two-circuit infinite circulation path, the direction change paths 60 cross each other.

  FIG. 3 is a view showing a state in which the lid 5 and the circulation path forming member 6 are detached from the main body member 4, and the main body member 4 is cut in half by the horizontal portion 4a, and only one leg 4b is cut. Is shown. As can be seen from this figure, an upper load rolling surface 42a and a lower load rolling surface 42b are formed on the inner surface of the leg 4b of the main body member 4. The leg portion 4b is formed with a lower through hole 45b corresponding to the upper load rolling surface 42a and an upper through hole 45a corresponding to the lower load rolling surface 42b. A part of the circulation path forming member 6 is inserted into the hole 45a and the lower through hole 45b, so that the return path 44 is constructed.

  Further, a female screw hole 46 for fastening a fixing bolt penetrating the lid 5 is formed on an end surface of the main body member 4 to which the lid 5 is attached. A locking groove 48 having a V-shaped cross section is provided at an intermediate position between the upper load rolling surface 42a and the lower load rolling surface 42b on the inner side surface of the leg portion 4b. The center holding member 9 (see FIG. 2) for guiding the rolling element 1 is positioned with respect to the upper load rolling surface 42a and the lower load rolling surface 42b by using the locking groove 48. Has become.

  FIG. 4 is a perspective view showing the circulation path forming member 6. The circulation path forming member 6 is inserted into the through-hole 45a or 45b of the main body member 4 and has the return path 44 formed therein, and a direction change section 8 for constructing the direction change path 60. The return passage pipe 7 and the direction changing portion 8 are integrated by injection molding of a synthetic resin. The entire length of the return passage pipe 7 is formed slightly longer than the lengths of the through holes 45a and 45b formed in the main body member 4. The return passage pipe 7 and the direction changing portion 8 are not necessarily required to be integrated, but may be formed separately and then assembled when mounted on the main body member 4.

  The direction change portion 8 has a built-in inside direction change path curved in a substantially U-shape, and the inside direction change path is continuous with the return passage 44 formed in the return passage pipe 7. As shown in FIG. 4, an inner guide surface 60 a of the outer turning path is formed in an arch shape on the outer surface of the turning section 8. The outer turning path is provided so as to guide the roller 1 in a direction intersecting with the inner turning path, and the inner circumferential guide surface 60 a is provided on the inner side so as to straddle the outer wall of the turning section 8. Intersects a turnway. Further, in order to position the circulation path forming member 6 with respect to the main body member 4, a positioning projection is provided on the circulation path forming member 6. It fits into the formed position reference hole 47 (see FIG. 3).

  FIG. 5 is a perspective view showing a state in which the circulation path forming member 6 is mounted on the leg 4b of the main body member 4, and the return passage pipe 7 of the circulation path forming member 6 is connected to the upper through hole 45a of the leg 4b. Shows the state inserted in. The return passage pipe 7 is formed to be slightly longer than the length of the body member 4 in the moving direction (the longitudinal direction of the track member), and the return passage pipe 7 is provided until the direction change portion 8 contacts the leg portion 4b. When the pipe 7 is inserted into the through hole 45a, the tip of the return passage pipe 7 slightly projects from the surface on the opposite side of the leg 4b, though not shown in FIG. In this state, the inner turning path built in the turning section 8 is connected to the lower load rolling surface 42b formed in the main body member 4, and the outer turning path formed in the turning section 8 is formed. The inner peripheral side guide surface 60a is connected to the upper load rolling surface 42a of the main body member 4. FIG. 5 shows one end surface of the leg portion 4b to which the circulation path forming member 6 is attached. On the opposite end surface of the leg portion 4b, a lower through hole 45b of the leg portion is formed. On the other hand, the return passage pipe 7 of the circulation path forming member 6 is inserted. Thereby, the pair of circulation path forming members 6 are combined with the leg 4b interposed therebetween, and since the main body member 4 has a pair of leg portions, four main body members 4 are provided. Is formed.

  On the other hand, the lid 5 (see FIG. 1) is manufactured by injection molding of a synthetic resin, and is fastened to the main body member 4 with fixing bolts so as to cover the direction changing portion 8 of the circulation path forming member 6. You. An outer guide surface corresponding to the inner guide surface 60a of the circulation path forming member 6 is formed in a concave curved surface on an inner surface of the lid 5, that is, a surface facing the main body member 4. When the lid is mounted on the main body member, the outer peripheral guide surface of the lid 5 and the inner peripheral guide surface 60a of the direction changing portion 8 face each other, and the outer direction turning path is completed.

  The moving member 3 is completed by combining the four circulation path forming members 6 having the same shape and the two lids 5 having the same shape with the main body member 4 in this manner. Two infinite circulation paths of the roller 1 are formed for each leg 4b.

  As shown in FIG. 4, in the pipe portion 7 of the circulation path forming member 6, a tip fixing portion 7 a inserted into the through hole 45 of the main body member 4 is formed in a cylindrical shape, and the outer diameter thereof is There is a predetermined tolerance with respect to the inner diameter of the through hole 45. In addition, the pipe portion 7 has a base fixing portion 7b connected to the direction changing portion 8 and has a similar cylindrical shape. Thereby, the pipe part 7 is held in the through hole 45 of the main body member 4.

  On the other hand, an elastic deformation portion 7c is provided between the distal end fixing portion 7a and the proximal end fixing portion 7b. As shown in FIG. 6, the elastic deformation portion 7c includes a support beam 71 having a passage groove 70 of the roller 1 that rolls under no load, and a plate-like plate that closes the passage groove 70 of the support beam 71. And a unit 72. The return passage 44 of the roller 1 is constructed with respect to the elastic deformation portion 7c by covering the passage groove 70 provided in the support beam portion 71 with the plate portion 72. The support beam 71 has both ends in the longitudinal direction held by the distal end fixing portion 7a and the base end fixing portion 7b. The depth of the passage groove 70 formed in the support beam 71 is smaller than the diameter of the roller 1. When the plate portion 72 covers the passage groove 70, the roller 1 rolls in the return passage 44 with no load. The plate portion 72 is not joined to the support beam portion 71, and only both ends in the longitudinal direction are held by the distal end fixing portion 7a and the proximal end fixing portion 7b of the pipe portion 7. Therefore, when the plate portion 72 is pressed outward from the inside of the passage groove 70, the plate portion 72 bends along the longitudinal direction of the pipe member 7, and the return passage 44 is expanded accordingly.

  6 and 7 are exploded perspective views of the circulation path forming member 6. FIG. The circulation path forming member 6 is divided into a first circulation half 6A and a second circulation half 6B. By combining the first circulation half 6A and the second circulation half 6B, the circulation path forming member The inside of the pipe portion 6 is provided with the return passage 44, and the inside of the direction change portion 8 is provided with an inside direction change path 61. The circulation path forming member 6 is configured such that, in the direction change section 8, the distal end fixing section 7 a and the base end fixing section 7 b of the pipe section 7, the first circulation half has a plane including the center line of the inner direction change path 61. It is divided into a body 6A and the second circulating half 6B, and the first circulating half 6A and the second circulating half 6B are formed in these portions in a substantially symmetrical shape.

  On the other hand, the elastic deformation portion 7c of the pipe portion 7 is a plane orthogonal to a plane including the center line of the inner turning path 61, that is, a plane orthogonal to the division surface of the turning section 8, and It is divided into a half 6A and the second circulation half 6B. The plate portion 72 is formed on the first circulation half 6A, and the support beam portion 71 is formed on the second circulation half 6B. Accordingly, in the first circulation half 6A, the distal end fixing portion 7a and the proximal end fixing portion 7b are connected by the plate portion 72, and in the second circulation half 6B, the distal end fixing portion 7a and the base end fixing portion 7b are connected by the support beam 71.

  FIG. 8 shows the elastic deformation portion 7c inside the through hole 45 of the main body member 4. When the roller 1 circulates in the endless circulation path, the roller 1 itself does not rotate and move in the no-load path of the roller 1 including the direction change path 60 and the pair of return paths 44. It rolls while being pushed by the subsequent roller 1 continuously discharged from the load passage 43. For this reason, when the rollers 1 are arranged continuously in an infinite circulation path, the rollers 1 are pressed against each other in a no-load passage and are arranged in a staggered manner, and the clogging phenomenon of the rollers 1 occurs. there's a possibility that.

  In this regard, the plate portion 72 is held only at the both ends in the longitudinal direction by the distal end fixing portion 7a and the base end fixing portion 7b of the pipe portion 7, and the plate portion 72 and the through hole 45 of the main body member 4 are provided. Since there is a gap between the plate portion 72 and the inner peripheral surface of the plate portion 72, the plate portion 72 is easily deformed in the vicinity of the central portion in the longitudinal direction, and when deformed, the return passage 44 is formed according to the deformation amount. Passage width is expanded. For this reason, as shown in FIG. 9, when the rollers 1 rolling in the return passage 44 strongly press each other and these rollers 1 are arranged in a staggered manner in the return passage 44, the rollers 1 A pressing force is applied to the plate portion 72, and as a result, the plate portion 72 is elastically deformed. Thereby, the passage width of the return passage 44 is expanded, the frictional resistance between the rollers 1 is reduced, and the occurrence of the clogging of the rollers 1 in the return passage 44 can be prevented.

  As described above, in the rolling guide device to which the present invention is applied, when the rollers 1 are arranged in the infinite circulation path without any gap, the rollers 1 enter and exit the load passage 43, It is possible to ensure smooth circulation of the roller 1 and to achieve smooth movement of the moving member 3 with respect to the track rail 2 without causing the roller to receive a large frictional resistance and causing a clogging phenomenon in the return passage 44. It is.

  In addition, the circulation path forming member 6 makes the direction of the divided surface of the first circulation half 6A and the second circulation half 6B 90 degrees between the elastic deformation portion 7c of the pipe portion 7 and other parts. Due to the difference, it is possible to effectively prevent the occurrence of the clogging phenomenon of the rolling elements in the return passage while facilitating the formation of the direction change path with respect to the circulation path forming member.

  In the above-described embodiment, the present invention is applied to the rolling guide device using a roller as a rolling element, but the present invention is also applicable to a rolling guide device using a ball as a rolling element.

DESCRIPTION OF SYMBOLS 1 ... Roller (rolling element), 2 ... Track member, 3 ... Moving member, 4 ... Body member, 5 ... Lid, 6 ... Circulation path forming member, 6A ... First circulation half, 6B ... Second circulation half Reference numeral 7: Pipe portion, 8: Direction changing portion, 70c: Elastic deformation portion, 71: Support beam portion, 72: Plate portion

Claims (2)

A track member having a rolling surface of a rolling element along a longitudinal direction, and an infinite circulation path including a return path and a direction change path of the rolling element, which is assembled to the track member via a number of rolling elements. And a moving member,
The moving member includes a main body member, a plurality of circulation path forming members mounted on the main body member, and a pair of lids mounted on the main body member so as to cover these circulation path forming members,
The circulation path forming member is formed of a combination of a first circulation half and a second circulation half, has the return path, and has a pipe portion inserted into a through hole of the main body member, and has the direction change path, A direction change portion provided at one end of the pipe portion and disposed on an end surface in the movement direction of the main body member,
At the center of the pipe portion of the circulation path forming member in the longitudinal direction, there is provided an elastic deformation portion which is appropriately pressed and deformed by a rolling element in the return passage, while the elastic deformation portions are provided at both longitudinal ends of the pipe portion. A pair of cylindrical fixing parts are formed with the
The direction change part and the pair of fixing parts are divided into the first circulation half and the second circulation half by a plane including a center line of the direction change path, while the elastic deformation part is the direction change part. The rolling guide device is divided into the first circulation half and the second circulation half by a plane orthogonal to a plane including a center line of the road. The elastically deforming portion has a passage groove deeper than the diameter of the rolling element, and the support beam portion provided in the second circulation half, and covers the passage groove of the support beam portion, and the support beam portion A flexible plate portion that is detachable with respect to and is provided on the first circulation half,
The rolling guide device according to claim 1, wherein a gap is provided between the plate portion and an inner peripheral surface of the through hole of the main body member to allow elastic deformation of the plate portion.

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