JP6315457B2 - Rolling guide device - Google Patents

Description

  The present invention relates to a rolling guide device that reciprocally guides a movable body such as a table in a work table of a machine tool or a linear guide portion or a curved guide portion of various conveying devices.

  As this type of rolling guide device, one disclosed in Patent Document 1 is known. A rolling guide device disclosed therein is assembled to a raceway member via a raceway member in which a rolling groove of a ball is formed along a longitudinal direction and a large number of balls rolling in the rolling groove, and the raceway. And a moving member that can reciprocate along the member. The moving member is provided with an infinite circulation path for the ball, and the ball circulates in the infinite circulation path so that the moving member can move along the track member without being restricted in stroke. The infinite circulation path includes a load path in which the ball rolls while applying a load, a no-load path provided in parallel with the load path and penetrating along the moving direction of the moving member, and the load paths And a direction change path connecting the no-load passages.

  In the infinite circulation path, a plurality of spacers are interposed between adjacent balls. This spacer has a spherical seat corresponding to the outer peripheral surface of the ball, and is provided to prevent the ball from meandering.

  On the other hand, the moving member has a moving member body formed with a through-hole that forms a load passage and a no-load passage between the moving member, and the direction change path, and is combined with the moving member body. Thus, the circuit includes a circulation path forming body that forms an infinite circulation path of the ball, and lid portions that are fixed to both ends in the axial direction of the moving member main body so as to cover the circulation path forming body. The circulation path forming body is formed integrally with the plate portion on which the inner peripheral side guide surface of the direction changing path is formed, and is inserted into the through hole of the moving member main body so as to form the no-load passage. And a no-load passage forming portion. On the other hand, an outer peripheral side guide surface of the direction change path is formed on the lid.

  And a pair of circulation path formation body is assembled | attached from the axial direction both ends of the said moving member main body so that the said moving member main body may be pinched | interposed. At this time, one end of the no-load passage forming portion formed in one circulation path forming body is inserted into the through hole of the moving member main body, and is connected to the plate portion formed in the other circulation path forming body. ing. Thereby, the inner peripheral side guide surface of the said direction change path and a no-load channel | path are connected. Further, the direction change path is completed by covering a pair of lids from the axial direction of the moving member main body. As a result, the no-load path and the direction change path are communicated.

JP 2008-144852 A

  In the conventional rolling guide apparatus configured as described above, when the ball enters the direction change path, the ball rolls in an arc along the outer peripheral side guide surface of the lid portion. On the other hand, each spacer is arranged so that its axis coincides with a straight line connecting the center points of adjacent balls. For this reason, at the same time that the ball starts to roll on the direction change path, the spacer gradually approaches the inner peripheral side guide surface of the ball guide portion rather than the ball. Therefore, when there is a step between the endless circulation path and the direction change path, the spacer may come into contact with the step and the spacer may be damaged in the endless circulation path. . As a result, there has been a problem that the smooth circulation of the ball in the infinite circulation path is hindered.

  On the other hand, in the rolling guide device disclosed in Patent Document 1, although the ball guide portion and the no-load passage forming portion are integrally formed, the no-load passage forming portion is formed in the through hole of the moving member body. Is used to complete the no-load passage of the ball, and therefore, between the no-load passage formation portion related to one circulation path formation body and the ball guide portion related to the other circulation path formation body. There is always an assembly point. In this case, the positioning of the circulation path forming bodies is not accurately performed, and there is a possibility that a step is generated between the pair of circulation path forming bodies. As a result, the problem as described above may occur.

  The present invention has been made in view of such problems, and the object of the present invention is to prevent the spacer from being damaged as much as possible and to smoothly circulate the ball in the infinite circulation path. An object of the present invention is to provide a rolling guide device capable of preventing the rolling member from generating rolling resistance with respect to the track member.

That is, the present invention includes a track member, a moving member that is assembled to the track member via a plurality of balls and has an infinite circulation path through which the ball circulates, and a plurality of balls accommodated in the endless circulation path, A plurality of spacers disposed between adjacent balls, and
The infinite circulation path includes a load path in which the ball rolls while applying a load, a no-load path provided in parallel with the load path, and a direction change path connecting the load path and the no-load path.

  The moving member includes a moving member main body having a load rolling groove constituting the load passage and a no-load rolling groove constituting the no-load passage, and an infinite circulation of the ball in combination with the moving member main body. A circulation path forming body that constitutes a path, a covering portion that covers the no-load rolling groove and that constitutes the no-load passage, and a lid that constitutes the direction change path in combination with the circulation path formation body, The circulation path forming body is joined to both axial end faces of the moving member main body and a pair of plate parts on which inner peripheral side guide surfaces of the direction changing path are formed, and integrally with each plate part. And a pair of passage introduction portions that are molded and have a through hole continuous with the inner circumferential guide surface.

  In the present invention, since each passage introduction portion and each plate portion are formed integrally, the through hole forming the no-load passage and the inner peripheral side guide surface of the direction changing passage are continuous. As a result, there is no connection between the members between the direction change path and the no-load path. Therefore, in the infinite circuit, it is possible to prevent the breakage of the spacer and realize a smooth circulation of the ball, thereby preventing the rolling resistance of the moving member with respect to the raceway member.

It is a perspective view showing one embodiment of a rolling guide device to which the present invention is applied. It is a disassembled perspective view of the moving member with which the rolling guide apparatus shown in FIG. It is a perspective view which shows the circulation path formation body and coating | coated part with which the moving member shown in FIG. 2 is provided. It is a schematic diagram which shows the infinite circuit provided with the rolling guide apparatus shown in FIG. It is a schematic diagram which shows the boundary of the no-load channel | path of the infinite circulation path shown in FIG. 4, and a direction change path.

  FIG. 1 shows an example of an embodiment of a rolling guide device to which the present invention is applied. This rolling guide device includes a track rail 1 as a track member, and a moving block 2 as a moving member that is assembled to the track rail 1 via a plurality of balls and constitutes an infinite circulation path of the balls. The moving block 2 can move along the track rail 1 by circulating the ball in the endless circulation path.

  A pair of ball rolling grooves 11 are formed on each side surface of the track rail 1. That is, four ball rolling grooves 11 are formed in the entire track rail 1. On each side surface of the track rail 1, a pair of ball rolling grooves 11 are provided in parallel and face each other. Each ball rolling groove 11 is inclined at an angle of 45 ° with respect to the bottom surface 12 of the track rail 1, and the rolling groove 11 located on the top surface 13 side of the track rail 1 is obliquely below and the bottom surface 12. The rolling groove 11 located on the side faces obliquely upward with respect to the bottom surface 12. In addition, mounting holes 14 for fixing bolts are formed in the track rail 1 at predetermined intervals along the longitudinal direction, and the mounting holes 14 are used when the track rail 1 is laid on a fixing portion such as a base. .

  Next, the moving block 2 will be described with reference to FIG. The moving block 2 includes a block main body 3 as a metal moving member main body, a circulation path forming body 4 assembled to the block main body 3, and an infinite circulation path of the ball in cooperation with the circulation path forming body 4. And a pair of lid portions 6 fixed to the block main body 3 so as to cover the circulation path forming body 4. Between the block main body 3 and the track rail 1, a load passage where the ball rolls while applying a load is applied, and between the block main body 3 circulation path forming body 4 and the covering portion 5, the ball is released from the load. A no-load passage that rolls in the generated state is formed. On the other hand, a direction changing path for changing the rolling direction of the ball in the endless circulation path is configured between the circulation path forming body 4 and each lid portion 6.

  Two load rolling grooves 31 that face the ball rolling grooves 11 of the track rail 1 are formed in the block body 3. The load passage is completed when these load rolling grooves 31 and the ball rolling grooves 11 of the track rail 1 face each other. Since the track rail 1 and the block body 3 are respectively provided with two load rolling grooves 31 and ball rolling grooves 11, there are two load passages between the track rail 1 and the block body 3. It is formed.

  Further, a single protrusion 32 protrudes along the longitudinal direction on the outer surface of the block body 3. Two unloaded rolling grooves 33 are formed on the upper and lower sides of the protrusion 32 so as to be substantially parallel to the loaded rolling grooves 31. The ball rolls on each unloaded rolling groove 33 while being released from the load. 2 shows the disassembled moving block 2 observed from one direction, so that only one unloaded rolling groove 33 is drawn, and the other unloaded rolling groove 33 sandwiches the convex portion 32. It is located in the lower part of the drawing.

  Furthermore, the joint part 34 which the part of the said circulation path formation body 4 combines is notched in the axial direction both ends of the block main body 3. FIG. The joint portion 34 is cut out from the outer surface of the block body 3 to the convex portion 32 and is continuous with both ends of the no-load rolling groove 33 through a step. As described above, since the no-load rolling groove 33 is formed in the block main body 3, four joint portions 34 are formed in the block main body 3. Further, fixing holes 35 are formed on both end surfaces in the axial direction of the convex portion 32. The fixing hole 35 is used when the circulation path forming body 4 is fixed to the block body 3. Further, mounting holes 36 are formed in the block body 3 at predetermined intervals along the longitudinal direction, and the mounting holes 36 are used when a movable body such as a table is fixed to the moving block 2.

  Next, the circulation path formation body 4 and the coating | coated part 5 are demonstrated in detail using FIG. The circulation path forming body 4 includes a plate portion 7 joined to both end surfaces of the block body 3 in the axial direction, and a pair of passage introduction portions 8 that form an entrance / exit of the no-load passage. Each passage introducing portion 8 and the plate portion 7 are integrally formed.

  The plate portion 7 includes two ball guide portions 71 protruding in a substantially semicircular shape. Each ball guide portion 71 is formed with an inner peripheral side guide surface 72 of the direction change path. Further, a circular opening hole 73 passes through the plate portion 7. The opening 73 penetrates along the axial direction of the plate portion 7. On the other hand, the opening 73 is continuous with one end of the inner circumferential guide surface 72. As described above, since two ball guide portions 71 are provided in the plate portion 7, two opening holes 73 are formed in the plate portion 7. A fixing hole 74 passes through a region surrounded by the pair of opening holes 73. The fixing hole 74 communicates with the fixing hole 35 of the block body 3.

  Each passage introducing portion 8 has a through hole 81 and is closed, and has a substantially rectangular configuration. The thickness of the passage introducing portion 8 along the axial direction of the moving block 2 is set to be at least larger than the diameter of the ball. The passage introducing portion 8 is formed integrally with the plate portion 7 and protrudes in a direction opposite to the ball guiding portion 71. Further, the through hole 81 of each passage introducing portion 8 is formed coaxially with the opening hole 73 formed in the plate portion 7 and communicates with the opening hole 73. The ball rolling on the inner circumferential guide surface 72 and the opening hole 73 rolls in the through hole 81 in a state released from the load, and the passage introducing portion 8 is formed of the ball. The connection part of the direction change path and the said no-load channel | path is comprised. That is, each passage introduction portion 8 constitutes an entrance / exit of the no-load passage. The passage introducing portions 8 formed in this way are formed at both ends of the covering portion 5 and are fitted to the joint portions 34 formed in the block main body 3.

  Next, the covering portion 5 will be described. The covering portion 5 is formed in a substantially arc shape, and an unloaded rolling groove 51 is formed on the inner side surface of the covering portion 5 to roll in a state where the ball is released from the load. The no-load rolling groove 51 is opened toward the block body 3. The no-load rolling groove 51 and the no-load rolling groove 33 face each other so that the no-load passage of the ball is completed. The no-load rolling groove 51 is continuous with the through-hole 81 formed in each passage introduction portion 8 without a step. As described above, since the through hole 81 is continuous with the opening hole 73 formed in the plate portion 7, the no-load rolling groove 51 passes through the through hole 81 and the inner hole 73. It is continuous with the circumferential guide surface 72 without a step.

  Two covering portions 5 formed in this way are provided between the pair of circulation path forming bodies 4 in the vertical direction and are formed in parallel to each other. That is, one circulation path forming body 4 is formed integrally with the other circulation path forming body 4 via a pair of covering portions 5. Furthermore, the convex part 32 of the said block main body 3 fits between a pair of coating | coated parts 5 arrange | positioned in parallel.

  On the other hand, each cover part 6 is formed in the substantially rectangular parallelepiped. Each lid portion 6 is fixed to the block body 3 so as to cover the plate portion 7. Two semicircular recesses 61 are formed on the inner surface facing the plate portion 7, and an outer peripheral guide surface 62 constituting the direction changing path is formed on the inner peripheral surface of the recess 61. Yes. Each lid portion 6 is formed with a fixing hole 63 along the axial direction. The fixing hole 63 is used when the lid portion 6 is fixed to the block body 3.

  Next, the method for assembling the moving block 2 and the infinite circulation path completed thereby will be described with reference to FIGS. FIG. 4 is a cross-sectional view of the moving block 2 cut along a plane including an infinite circulation path of balls, and FIG. 5 is a schematic view showing a connecting portion of the load path and the no-load path with the direction change path. In FIG. 4, the balls and spacers accommodated in the infinite circuit are omitted in order to make the configuration of the infinite circuit easy to see.

  First, the circulation path forming body 4 and the covering portion 5 are assembled so as to cover the outer surface of the block body 3. Thereby, the convex part 32 of the block main body 3 fits between the pair of covering parts 5. At the same time, each passage introduction portion 8 is fitted into the joint portion 34 of the block body 3. Thereby, the no-load rolling groove 51 of the said coating | coated part 5 and the no-load rolling groove 33 of the block main body 3 oppose, Furthermore, this through-hole 81 formed in this no-load rolling groove 33 and the said channel | path introduction part 8 is provided. Is connected. As a result, two ball no-load passages 21 are completed between the block body 3 and the circulation path forming body 4 and the covering portion 5. In this state, the pair of plate portions 7 are in contact with both end surfaces of the block body 3 in the axial direction, and the fixing holes 74 of the plate portions 7 and the fixing holes 35 of the block body 3 communicate with each other.

  Further, when a pair of lid portions 6 are assembled from the axial direction of the block body 3 so as to cover each plate portion 7, an inner peripheral side guide surface 72 formed on the ball guide portion 71 and an outer periphery formed on the lid portion 6. The side guide surfaces 62 face each other. As a result, two ball direction change paths 22 are completed between the plate portion 7 and the lid portion 6. As a result, the no-load passage 21 and the load passage are connected by the direction change paths 22, and the load path, the direction change path 22, the no-load path 21, and the direction change path 22 are connected between the track rail 1 and the moving block 2. Two infinite circulation paths of the ball that make a round in order are completed. The endless circulation path thus completed contains a plurality of balls 9 and a plurality of spacers 91 arranged between adjacent balls 9. Each spacer 91 has a spherical seat corresponding to the outer peripheral surface of the ball 9. Further, the spacers 91 are arranged so that the axis thereof coincides with a straight line connecting the center points of the adjacent balls 9.

  The block body 3, the circulation path forming body 4, the covering portion 5, and the lid portion 6 are assembled to each other so that the fixing holes 63 of the lid portions 6 are fixed to the fixing holes 74 of the plate portion 7 and the fixing holes of the block body 3. Communicate with 35. Each member is fixed to each other by fastening a fixing bolt to the holes 35, 63 and 74. In addition, the holding plate 92 is assembled to the block body 3, the circulation path forming body 4, the covering portion 5, and the lid portion 6 fixed to each other. By assembling the holding plate 92, the members 3, 4, 5, and 6 are more firmly fixed. Further, the holding plate 92 holds a ball rolling on the load rolling groove 31 of the block body 3 and prevents the ball from being detached from the load passage.

  In the rolling guide device according to the present embodiment formed as described above, in the circulation path forming body 4, the passage introducing portion 8 that forms the entrance / exit of the no-load passage 21 and the ball guiding portion 71 of the plate portion 7 are provided. A step is not formed between the inner circumferential guide surface 72 of the direction change path 22 and the through hole 81 constituting the no-load path 21. For this reason, even if the ball 9 starts rolling on the direction change path 22 and the spacer 91 gradually approaches the inner peripheral side guide surface 72 of the ball guide portion 71 rather than the ball 9, the spacer 9 It is possible to prevent the movement of 91 from being obstructed at the connecting portion between the direction change path 22 and the no-load passage 21 as much as possible. As a result, damage to the spacer 91 can be prevented, and smooth circulation of the balls 9 in the infinite circulation path can be realized.

  In the rolling guide device according to the present embodiment, the axial thickness of the passage introducing portion 8 is set to be at least larger than the diameter of the ball 9. That is, the combination position of the block main body 3 and the circulation path forming body 4 is displaced to the center of the moving block 2 as compared with the conventional rolling guide device (see FIG. 5). In other words, the combination position of the block main body 3 and the circulation path forming body 4 is provided not in the boundary between the no-load passage 21 and the direction change path 22 but in the no-load passage 21. For this reason, even if a step is generated between the block main body 3 and the circulation path forming body 4, the step is positioned at the center of the moving block 2 rather than the position where the spacer 91 starts to be displaced. As a result, it is possible to prevent the spacer 91 from coming into contact with the step formed between the block main body 3 and the circulation path forming body 4 as much as possible, and thus the breakage of the spacer 91 can be prevented.

  Further, in the rolling guide device in which the ball 9 circulates in the infinite circulation path, for example, an excessive load acts on the moving block 2 and the ball 9 tries to enter the load path from the direction change path 22 or When foreign matter is mixed in the infinite circulation path, the smooth circulation of the ball 9 in the infinite circulation path is hindered, thereby pushing the circulation path forming body 4 against the block body 3. The force to act. The force for expanding the circulation path forming body 4 against the block body 3 is generated when the circulation path forming body 4 is deformed, in particular, the no-load passage 21 and the direction change path 22 in the circulation path forming body 4. Concentrates on the connection site. For this reason, depending on long-term use, the said coating | coated part 5 bends centering on the connection part of the no-load channel | path 21 and the direction change path 22, and stress concentrates on this connection part. And finally, the covering portion 5 may be damaged from the connection portion between the no-load passage 21 and the direction change path 22.

  However, according to the rolling guide device according to the present embodiment, the covering portion 5 is formed in an arc shape, whereas the passage introduction portion 8 is formed in a substantially rectangular shape, and the passage introduction portion 8 is It is formed thicker than the covering portion 5. Further, the passage introducing portion 8 serves as a joint portion between the covering portion 5 and the plate portion 7. That is, the passage introduction portion 8 is disposed at the boundary between the no-load passage 21 and the direction change passage 22. For this reason, the rigidity and intensity | strength with respect to the bending of the said coating | coated part 5 are ensured compared with the conventional rolling guide apparatus. As a result, even if a force to push the circulation path forming body 4 against the block main body 3 is applied, the circulation path forming body 4 and the entire moving block 2 are prevented from being damaged as much as possible. It is possible.

  In the rolling guide device according to the present embodiment, the axial thickness of the passage introducing portion 8 is set to be at least larger than the diameter of the ball 9, but the joining portion of the block body 3 and the circulation path forming body 4 is The farther the distance from the connecting portion between the direction change path 22 and the no-load passage 21 is, the better the distance is from the connecting portion. That is, it is preferable that the axial thickness of the passage introducing portion 8 is larger than the ball diameter. However, since it is necessary to form the attachment hole 36 in the block main body 3, it is necessary to form the joint 34 so as not to interfere with the attachment hole 36. For this reason, it is necessary to shape the axial thickness of the passage introducing portion 8 fitted to the joint portion 34 correspondingly.

  Further, in the rolling guide device according to the present embodiment, a configuration in which the pair of circulation path forming bodies 4 are integrally formed through the two covering portions 5 is employed. However, it may be a configuration in which the covering portions 5 are divided, for example. However, considering the reduction in the number of parts and the ease of assembly to the block body 3, a configuration in which the pair of circulation path forming bodies 4 are integrally formed through the two covering portions 5 is better.

  Further, in the rolling guide device according to the present embodiment, each covering portion 5 is formed integrally with the passage introducing portion 8, but the covering portion 5 cooperates with the block body 3 to load the unloaded passage 21 of the ball 9. If it is the structure which forms, each covering part 5 and the channel | path introduction part 8 do not need to be shape | molded integrally.

  Furthermore, in the rolling guide device according to the present embodiment, the track rail 1 is formed in a straight line to constitute a linear guide device, but in the present invention, the moving block 2 includes a load passage, a no-load passage, and a direction change passage. Any rolling guide device having an infinite circulation path is applicable. As an example, a curved guide device in which the track rail 1 is formed in a curved shape with a constant curvature can be considered.

DESCRIPTION OF SYMBOLS 1 ... Track rail (track member), 2 ... Moving block (moving member), 3 ... Moving block main body (moving member main body), 4 ... Circulation path formation body, 5 ... Cover part, 6 ... Cover part, 7 ... Plate part , 8 ... passage introduction part, 21 ... no-load passage, 22 ... direction change path, 33 ... no-load rolling groove

Claims (2)

A track member, a moving member assembled to the track member via a plurality of balls and having an infinite circulation path through which the balls circulate, a plurality of balls accommodated in the endless circulation path, and a ball adjacent to each other A plurality of spacers disposed on,
The infinite circulation path includes a load path in which the ball rolls while applying a load, a no-load path provided in parallel with the load path, and a direction change path connecting the load path and the no-load path. ,
The moving member has a load rolling groove that constitutes the load passage and a no-load rolling groove that constitutes the no-load passage, and has a joint cut out at both ends of the no-load rolling groove. a body, a pair of circulating path forming member constituting the endless circulation path of the ball is located in the axial end surfaces of the moving member body, as well as constituting the unloaded passage over the no-load rolling groove A covering portion that connects the pair of circulation path forming bodies, and a lid portion that forms the direction change path in combination with the circulation path forming body,
Each circulation path forming body is in contact with the axial end surface of the moving member main body and has a rectangular shape that fits into the joint portion of the moving member main body and the plate portion on which the inner peripheral guide surface of the direction changing path is formed. A passage introduction portion formed integrally with the plate portion and the covering portion, and having a through-hole that is continuous with the inner circumferential side guide surface of the direction change passage and serves as an entrance / exit of the no-load passage , A rolling guide device comprising: The rolling guide device according to claim 1, wherein a thickness of the passage introducing portion in an axial direction is set larger than a diameter of the ball.

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