JP2009144855A - Movement device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movement device which facilitates installation of its outer casing to a mating component even when miniaturized. <P>SOLUTION: The movement device includes a raceway shaft 1 on which a rolling element rolling part is formed, a moving member 2 which is relative-movably assembled to the raceway shaft 1 and has a rolling element circulation passage including a load rolling element rolling part opposing the rolling element rolling part, and two or more rolling elements arranged in the rolling element circulation passage of the moving member 2. A guide groove 12 to guide a pin 20 for fixing the mating component is formed on the outer peripheral surface of the moving member 2 along axial direction from an axial direction end portion to a predetermined position. By fixing the moving member 2 to the mating component using the guide groove 12 and the pin 20 for fixing the mating component, a rotation stopper can be built even when the wall thickness of the moving member 2 is thin, and the work of fixing the moving member 2 to the mating component becomes easy. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motion device such as a spline that guides a moving body to linearly move or a screw device that rotates a screw shaft to relatively linearly move a nut.

  The spline is formed by assembling a substantially cylindrical orbit shaft and a cylindrical outer cylinder as a moving member, and is used as a motion guide device for guiding the moving body to linearly move. Generally, the outer cylinder is attached to the moving body, and the track shaft is attached to the fixed side. A plurality of rolling elements such as balls and rollers are interposed between the track shaft and the outer tube so as to be capable of rolling motion so that the outer tube can move relatively smoothly with respect to the track shaft. The spline is used as a device that not only guides the linear motion of the moving body but also transmits the torque to the moving body because the rolling body can apply torque.

  As a screw device, the position of the spiral ball rolling groove on the outer peripheral surface of the screw shaft and the spiral load ball rolling groove on the inner peripheral surface of the nut as the moving member are aligned, and rolling motion is possible between them There is known a ball screw in which a large number of balls are interposed. In this ball screw, a no-load return passage that forms a part of the ball circulation path is formed in the nut so that the ball can circulate. The friction coefficient when the screw shaft is rotated with respect to the nut is reduced by the rolling motion of the ball. Ball screws are widely used in various fields such as a feed mechanism of a machine tool, a positioning mechanism, and an automobile steering.

  By the way, as a method of fixing an exercise device such as a spline or a screw device to a counterpart component, a key fixing method is known in which these are fastened using a key that transmits torque between the moving member and the counterpart component (Patent Literature). 1). In this key fixing method, a key groove for inserting a key is formed in the moving member. Since the key is standardized and the corresponding keyway must be formed in the moving member, the key fastening method is effectively used for a certain amount of exercise device.

On the other hand, as a method for fixing a small exercise device to a counterpart component, a pin fixing method for fastening them using pins is also known. In a small exercise device, the torque applied to the device itself is small, so that torque can be transmitted by fastening using a pin. In this pin fixing method, a pin hole for inserting a pin is provided in the moving member of the exercise device. The counterpart part is also provided with a pin through hole at a position corresponding to the pin hole of the moving member in advance. The moving member is inserted into the mating part, the phase of the pin hole of the moving member and the pin through hole of the mating part is matched, and the pin is driven into them.
JP 7-35137 A (see FIG. 1)

  In recent years, with the miniaturization of the counterpart parts to which the exercise device is attached, the exercise device is also required to be reduced in size. Naturally, when the exercise device is downsized, the thickness of the moving member also decreases.

  When fixing such a small exercise device to a counterpart component, in the above-described key fixing method, a keyway must be formed on the moving member of the exercise device in accordance with the standardized key. In an exercise device in which the thickness of the moving member is reduced, it is difficult to form a key groove because a sufficient space for forming the key groove cannot be secured.

  In addition, when the exercise device is attached to the counterpart component by the above-described pin fixing method, there is no problem in the space for providing the pin hole. However, since the diameter of the pin may be as small as about 1 mm, for example, it is difficult to match the phase of the pin hole of the moving member and the pin through hole of the counterpart component. When actually inserting a pin, it is necessary to first align the phase between the pin hole of the moving member and the pin through hole of the mating part by passing light through. Of course, even if the phases of the pin hole and the pin through hole are visually matched, they may be displaced when the pin is driven in, which is difficult.

  Therefore, an object of the present invention is to provide an exercise device such as a spline or a screw device that can be easily fixed to a mating part even if it is downsized.

  In order to solve the above-mentioned problem, the invention according to claim 1 is assembled to a raceway shaft on which a rolling element rolling part is formed and a relatively movable assembly with respect to the raceway axis. A moving member having a rolling element circulation path including opposing load rolling element rolling sections, a plurality of rolling elements arranged in the rolling element circulation path of the moving member, and an axial end on an outer peripheral surface of the moving member To a predetermined position along the axial direction, and a guide groove for guiding a mating part fixing pin.

  According to a second aspect of the present invention, in the exercise device according to the first aspect, a positioning hole is formed in the guide groove so as to dig deeper than the guide groove and to fit the mating part fixing pin. It is characterized by being.

  According to a third aspect of the present invention, in the exercise device according to the second aspect, the positioning hole is formed at the innermost end portion of the guide groove.

  According to a fourth aspect of the present invention, in the exercise device according to the second or third aspect, the diameter of the positioning hole is slightly smaller than the width of the guide groove in the direction orthogonal to the track axis.

  According to a fifth aspect of the present invention, in the exercise device according to any one of the first to fourth aspects, the moving member includes the load rolling element rolling section and constitutes a part of the rolling element circulation path. A moving member main body having a no-load return passage, and a pair of lids provided at both ends in the moving direction of the moving member main body and having a direction changing path connecting the loaded rolling element rolling portion and the no-load return passage. The guide groove is formed from at least one lid member to the moving member main body, and the guide groove of the lid member extends from the end of the moving member main body toward the end of the moving member. It is characterized by being wide.

  The invention according to claim 6 includes a raceway shaft formed with a rolling element rolling part, a load rolling element rolling part that is assembled so as to be relatively movable with respect to the raceway axis, and that faces the rolling element rolling part. A moving member having a rolling element circulation path, a plurality of rolling elements arranged in the rolling element circulation path of the moving member, and an outer peripheral surface of the moving member formed from an axial end to a predetermined position along the axial direction. An exercise device having a guide groove formed therein, a moving member insertion portion into which the moving member of the exercise device is inserted, a mating component having a pin through hole connected to an inner peripheral surface of the moving member insertion portion, and the pin penetration It is a structure for fixing an exercise device to a mating part including a mating part fixing pin that is inserted into a hole and engages with the guide groove of the moving member to fix the mating part and the moving member.

  According to a seventh aspect of the present invention, in the structure for fixing an exercising device to the mating part according to the sixth aspect, the width of the guide groove in the direction perpendicular to the track axis is slightly larger than the diameter of the mating part fixing pin. It is characterized by.

  According to an eighth aspect of the present invention, in the structure for fixing an exercise device to a mating part according to the sixth or seventh aspect, the mating part fixing pin is fitted into the guide groove by digging deeper than the guide groove. The positioning hole for making it form is formed.

  According to a ninth aspect of the present invention, in the structure for fixing an exercise device to a mating part according to the eighth aspect, the positioning hole is formed at the innermost end of the guide groove.

  According to a tenth aspect of the present invention, in the structure for fixing the exercise device to the counterpart component according to the sixth aspect, the fixing structure of the exercise device to the counterpart component is the movement of the moving member in the axial direction relative to the counterpart component. It further has a retaining ring for stopping the movement.

  The invention according to claim 11 is the structure for fixing the exercise device to the counterpart part according to any one of claims 6 to 10, wherein the moving member of the exercise device has the load rolling element rolling part. A moving member main body having a no-load return passage that constitutes a part of the rolling element circulation path, and provided at both ends in the moving direction of the moving member main body, the loaded rolling element rolling section and the no-load return passage, A pair of lid members having a direction change path for connecting the guide member, and the guide groove is formed from at least one lid member to the movable member main body, and the guide groove of the lid member is an end portion on the movable member main body side. To the end of the moving member.

  The invention according to a twelfth aspect of the present invention provides a raceway shaft in which a rolling element rolling part is formed and a load rolling element rolling part that is assembled so as to be relatively movable with respect to the raceway axis and faces the rolling element rolling part. A moving member having a rolling element circulation path including a plurality of rolling elements arranged in the rolling element circulation path of the moving member, and a predetermined position along an axial direction from an axial end to an outer peripheral surface of the moving member. In the method of fixing the exercise device to the counterpart component for attaching to the counterpart component an exercise device comprising a guide groove for guiding the counterpart component fixing pin formed up to the counterpart component, the counterpart component is the movement of the exercise device A moving member insertion portion into which the member is inserted, and a pin through hole connected to an inner peripheral surface of the moving member insertion portion, and the other component fixing pin for fixing the counterpart component and the moving member is the pin Insert into the through hole, the mating part A pin inserting step of projecting the mating component fixing pin so that the length of the protruding portion of the mating component fixing pin on the inner peripheral surface of the moving member inserting portion is equal to or less than the depth of the guide groove; And a moving member inserting step of inserting the moving member into the moving member inserting portion so that the protruding portion of the component fixing pin is guided along the guide groove from the axial end of the moving member. This is a method of fixing the exercise device to the arm.

  According to a thirteenth aspect of the present invention, in the method for fixing an exercise device to a mating part according to the twelfth aspect, the mating part fixing pin is fitted into the guide groove by digging deeper than the guide groove. In the moving member inserting step, after the mating component fixing pin is guided to the positioning hole, the mating component fixing pin is pushed into the positioning hole.

  According to a fourteenth aspect of the present invention, in the method for fixing an exercise device to a counterpart part according to the twelfth aspect, after the moving member inserting step, a retaining ring is used to attach the axis of the moving member to the counterpart part. The method further includes a moving member fixing step for stopping movement in the direction.

  According to the first aspect of the present invention, the rotation stopper can be provided even if the moving member of the exercise device is thin. Further, since the guide groove for guiding the mating part fixing pin is formed in the moving member, the work of fixing the moving member to the mating part becomes easy.

  According to the invention described in claim 2, the mating part fixing pin can be guided to the positioning hole along the guide groove. When the mating part fixing pin is guided to the positioning hole, the moving member can be fixed to the mating part by pushing the mating part fixing pin into the positioning hole.

  According to the invention described in claim 3, if the mating part fixing pin is pushed in when the mating part fixing pin hits the innermost end portion of the guide groove, the mating part fixing pin can be pushed into the positioning hole. it can.

  According to the invention described in claim 4, the mating part fixing pin can move along the guide groove.

  According to the invention described in claim 5, since the entrance of the guide groove is formed in a trumpet shape, it is easy to insert the mating part fixing pin into the guide groove. Further, the guide groove of the lid member is formed in a trumpet shape, and the guide groove of the moving member main body is formed straight, so that it becomes easy to form the guide groove in the moving member.

  According to invention of Claim 6, even if the thickness of the moving member of an exercise device is thin, a rotation stop can be provided. Further, since the guide groove for guiding the mating part fixing pin is formed in the moving member, the work of fixing the moving member to the mating part becomes easy.

  According to the invention described in claim 7, the mating part fixing pin can move along the guide groove.

  According to the eighth aspect of the present invention, the mating part fixing pin can be guided to the positioning hole along the guide groove. When the mating part fixing pin is guided to the positioning hole, the moving member can be fixed to the mating part by pushing the mating part fixing pin into the positioning hole.

  According to the ninth aspect of the present invention, if the mating part fixing pin is pushed in when the mating part fixing pin hits the innermost end portion of the guide groove, the mating part fixing pin can be pushed into the positioning hole. it can.

  According to the tenth aspect of the present invention, since the mating part fixing pin prevents the moving member from rotating, and the retaining ring stops the movement of the moving member in the axial direction, the moving member can be fixed to the mating part. .

  According to the eleventh aspect of the present invention, since the entrance of the guide groove is formed in a trumpet shape, it is easy to insert the mating part fixing pin into the guide groove. Further, by forming the guide groove of the lid member in a trumpet shape and forming the guide groove of the outer cylinder main body straight, it becomes easy to form the guide groove in the moving member.

  According to the twelfth aspect of the invention, since the mating part fixing pin is guided along the guide groove of the moving member, it is easy to fix the moving member to the mating part.

  According to the invention described in claim 13, the mating part fixing pin can be guided to the positioning hole along the guide groove. When the mating part fixing pin is guided to the positioning hole, the moving body can be fixed to the mating part by pushing the mating part fixing pin into the positioning hole.

  According to the fourteenth aspect of the present invention, since the mating part fixing pin prevents the moving member from rotating, and the retaining ring stops the movement of the moving member in the axial direction, the moving member can be fixed to the mating part. .

  1 and 2 show an embodiment in which the present invention is applied to a spline which is a kind of exercise device. This spline includes a spline shaft 1 having a substantially circular cross section as a track shaft, and an outer cylinder 2 assembled as a moving member so as to be linearly movable relative to the spline shaft. The outer cylinder 2 is formed in a cylindrical shape surrounding the spline shaft 1. A plurality of balls 3 are interposed between the outer tube 2 and the spline shaft 1 so as to be capable of rolling motion. The linear movement of the outer cylinder 2 relative to the spline shaft 1 is relative, and either the spline shaft 1 or the outer cylinder 2 is attached to the movable side (moving body) and the rest is attached to the fixed side.

  The spline shaft 1 is a solid round bar or a hollow round bar. The spline shaft 1 is formed with a ball rolling groove 1a extending in the axial direction as a rolling element rolling portion in which the rolling element rolls. In this embodiment, four ball rolling grooves 1 a extending in the axial direction are formed on the outer peripheral surface of the spline shaft 1. The cross-sectional shape of each ball rolling groove 1a is formed into a circular arc groove shape with a constant curvature radius.

  The material of the spline shaft 1 is preferably a material suitable for quenching such as bearing steel and carbon tool steel. Since the ball 3 (see FIG. 5) rolls directly on the surface of the ball rolling groove 1a, it is desirable that the surface of the ball rolling groove 1a is subjected to heat treatment such as quenching.

  Although the outer cylinder 2 can move linearly with respect to the spline shaft 1, the outer cylinder 2 cannot rotate around the spline shaft 1 so that the torque of the spline shaft 1 can be transmitted to the outer cylinder 2. The ball rolling groove 1a of the spline shaft 1 rotates in the direction of the arrow B and the ball rolling groove 1a-1 that loads when the outer cylinder 2 rotates around the spline shaft 1 in the direction of the arrow A. It is comprised from the ball rolling groove 1a-2 which loads a load in case. The ball rolling groove 1a-1 and the ball rolling groove 1a-2 which are adjacent to each other form one group so that opposite loads in the A direction and the B direction can be applied. In the spline shown in FIG. 1, a total of four ball rolling grooves 1 a in two groups are formed on the outer peripheral surface of the spline shaft 1. The number of groups is variously set according to the magnitude of the transmitted torque.

  The outer cylinder 2 has a hollow cylindrical shape. The outer cylinder 2 includes a central outer cylinder main body 9 as a moving member main body, and end caps 8 as a pair of lid members provided at both axial ends of the outer cylinder main body 9.

  On the outer peripheral surface of the outer cylinder 2, a guide groove 12 for guiding the mating part fixing pin is formed from an end in the axial direction to a predetermined position of the outer cylinder main body 9. A mating part fixing pin 20 for securing the outer cylinder 2 to the mating part is guided in the guide groove 12. The guide groove 12 and the counterpart component fixing pin 20 will be described later.

  FIG. 3 shows the outer cylinder main body 9. The outer peripheral surface of the outer cylinder main body 9 has a cylindrical shape. The inner peripheral surface of the outer cylinder main body 9 is formed in a substantially cylindrical shape and has a loaded ball rolling groove 9a as a loaded rolling element rolling portion extending in the axial direction. The cross section of the load ball rolling groove 9a is formed in a circular arc groove shape like the ball rolling groove 1a of the spline shaft 1, and a load ball rolling path is formed with the ball rolling groove 1a of the opposing spline shaft 1 To do. Further, a no-load return passage 9b extending in parallel with the loaded ball rolling groove 9a is formed on the inner peripheral surface of the outer cylinder main body 9. One loaded ball rolling groove 9a and one unloaded return path 9b constitute a set of ball circulation paths. Since the loaded ball rolling groove 9a becomes a trajectory when the ball 3 rolls, it is desirable to have a predetermined hardness and a reduced surface roughness.

  As the material of the outer cylinder 2, a material suitable for quenching such as bearing steel and carbon tool steel is preferably used. The outer cylinder 2 may not be a complete cylindrical shape, but may be a so-called open shape cut in the axial direction.

  FIG. 4 is a perspective view of the end cap 8 attached to the end of the outer cylinder main body 9 in the axial direction. The end cap 8 is formed with a U-shaped direction change path 8a that connects the loaded ball rolling groove 9a of the outer cylinder body 9 and the no-load return path 9b. On the inner peripheral surface of the end cap 8, there is formed a seal projection 8b that faces the ball rolling groove 1a of the spline shaft 1 with a slight clearance. The end cap 8 is provided with a positioning stud 8 c that determines the position of the end cap 8 with respect to the outer cylinder main body 9. By fitting the stud 8 c into the reference groove 9 d of the outer cylinder main body 9, the end cap 8 is accurately positioned with respect to the outer cylinder main body 9. Furthermore, a through hole 8 d for attaching the end cap 8 to the outer cylinder main body 9 is formed in the end cap 8. The end cap 8 is attached to the outer cylinder body 9 by passing screws or bolts through the through holes 8 d and screwing them into the screw holes 9 e of the outer cylinder body 9. Since the end cap 8 has a complicated shape, it is manufactured by synthetic resin injection molding or metal injection molding.

  FIG. 5 shows the ball 3 interposed between the ball rolling groove 1 a of the spline shaft 1 and the loaded ball rolling groove 9 a of the outer cylinder main body 9. As described above, the load ball rolling groove 9 a of the outer cylinder body 9 faces the ball rolling groove 1 a of the spline shaft 1. The ball 3 is sandwiched between them and receives a compressive load. When the outer cylinder 2 is moved in the axial direction with respect to the spline shaft 1, the ball 3 rolls. On the other hand, the depth of the unloaded return passage 9b of the outer cylinder main body 9 is deeper than the depth of the loaded ball rolling groove 9a. In the no-load return passage 9 b, there is a slight clearance around the ball 3, and the ball 3 moves while being pushed by the subsequent ball 3. The material of the ball 3 is made of steel in the same manner as a rolling element used for a general bearing.

  FIG. 6 shows a ball circulation path 10 formed in the outer cylinder 2. When the outer cylinder body 9 and the end cap 8 are combined, a circuit-shaped ball circulation path 10 for circulating the ball 3 is formed. The ball circulation path 10 includes a loaded ball rolling groove 9 a of the outer cylinder body 9, a no-load return path 9 b of the outer cylinder body 9, and a U-shaped direction change path 8 a of the end cap 8. In order to reduce the overall thickness of the outer cylinder 2, the ball circulation path 10 of this embodiment is opened toward the spline shaft 1 in the entire area. The balls 3 arranged in the ball circulation path 10 circulate in the ball circulation path 10 while facing the spline shaft 1.

  When the outer cylinder 2 is moved along the spline shaft 1, the ball 3 sandwiched between the ball rolling groove 1a of the spline shaft 1 and the load ball rolling groove 9a of the outer cylinder 2 passes between these. Rolling exercise. The ball that has reached one end of the loaded ball rolling groove 9a enters the direction change path 8a. The ball 3 is released from the load in the direction change path 8 a and moves in the direction change path 8 a while being pushed by the subsequent ball 3. The ball 3 whose rolling direction is reversed in the direction changing path 8a enters the no-load return path 9b. The ball 3 that has passed through the unloaded return path 9b enters the loaded ball rolling groove 9a again from the opposite direction change path 8a. Thus, the ball is circulated.

  The guide groove 12 and the counterpart component fixing pin 20 will be described in detail below. As shown in FIGS. 1 and 2, a guide groove 12 is provided on the outer peripheral surface of the outer cylinder 2 for guiding the mating part fixing pin 20 when the outer cylinder 2 is attached to the stationary part or the mating part of the moving body. Is formed. The guide groove 12 is formed across the end cap 8 and the outer cylinder main body 9 from the axial end of the outer cylinder 2 to a predetermined position of the outer cylinder main body 9. The spline of this embodiment is small, and the diameter of the outer cylinder 2 is set to 10 mm or less, for example. As an example, when the diameter of the outer cylinder 2 is set to 6 mm and the diameter of the spline shaft 1 is set to 4 mm, the thickness of the cylindrical outer cylinder 2 is about 1 mm. A hole 13 is formed. The width of the guide groove 12 in the direction perpendicular to the spline axis is set to be slightly larger than the pin diameter d (see FIG. 8A) because it guides the mating component fixing pin 20.

  As described above, the guide groove 12 is formed across the end cap 8 and the outer cylinder main body 9. As shown in FIG. 1, the guide groove 12 formed in the end cap 8 is formed so that the outer cylinder 2 end side is wider than the outer cylinder main body 9 side. Thus, by forming the guide groove 12 in the end cap in a trumpet shape, the mating part fixing pin can be easily passed through the guide groove 12. For convenience of processing, the guide groove 12 in the outer cylinder body 9 is formed straight along the spline shaft 1 with a uniform width.

  As shown in FIGS. 1 and 2, a positioning hole 13 is formed at the innermost end of the guide groove 12. The positioning hole 13 is substantially circular according to the shape of the counterpart component fixing pin 20. The positioning hole 13 is formed flush with the guide groove 12 and is formed so that the innermost wall portion of the guide groove 12 and the inner side wall portion of the positioning hole 13 are continuous. As will be described later, a mating part fixing pin 20 guided in the guide groove 12 is fitted into the positioning hole 13. The mating part fixing pin 20 fitted in the positioning hole 13 serves to fix the outer cylinder 2 to the mating part in the axial direction. As long as this role is fulfilled, the position of the positioning hole 13 is not limited to the innermost end portion of the guide groove 12, and may be formed at any position of the guide groove 12 on the outer cylinder main body 9.

  Next, a method for attaching the spline of the present embodiment to a counterpart component (housing) will be described with reference to FIGS.

  The counterpart part 21 is previously provided with a pin through hole 22 through which the counterpart part fixing pin 20 is passed in order to fix the outer cylinder 2. The size of the pin through hole 22 is usually a size that can be fit when the mating component fixing pin 20 is pushed.

  First, as shown in the top view of FIG. 7A, the mating component fixing pin 20 is pushed into the pin through hole 22 of the mating component 21. At this time, the mating component fixing pin 20 is inserted from the outside of the mating component 21 and protrudes from the outer cylinder insertion portion 23 of the mating component 21. The protruding part 20a of the mating part fixing pin 20 from the inner peripheral surface of the outer cylinder insertion part 23 of the mating part 21 is guided by the guide groove 12 after the outer cylinder 2 is inserted into the outer cylinder insertion part 23 of the mating part 21. Therefore, the length h of the protrusion 20a is set to be equal to or less than the depth of the guide groove 12.

  The operation of causing the mating component fixing pin 20 to protrude from the inner peripheral surface of the outer cylinder insertion portion 23 of the mating component 21 may use a pin fixing jig. In that case, a pin fixing jig is first inserted into the outer cylinder insertion portion 23 of the counterpart component 21. Next, the counterpart component fixing pin 20 is pushed into the pin through hole 22 of the counterpart component from the outside. When the counterpart component fixing pin 20 comes into contact with the pin fixing jig, the counterpart component fixing pin 20 is positioned and the pin fixing jig is extracted. By using the pin fixing jig in this manner, the length of the protruding portion 20a of the counterpart component fixing pin 20 can be easily adjusted.

  Next, the spline is attached to the counterpart component 21. As described above, the spline attached to the counterpart component 21 is a state in which the spline shaft 1 and the outer cylinder 2 are assembled. The projecting portion 20 a of the mating component fixing pin 20 projecting from the inner peripheral surface of the mating component 21 is aligned with the axial end of the guide groove 12 of the outer cylinder 2. At this time, the guide groove 12 formed in the axial end of the outer cylinder 2, that is, the outer peripheral surface of the end cap 8, is formed in a trumpet shape so that the outer cylinder end is wider than the outer cylinder main body. . Due to the trumpet shape of the guide groove 12, even if the protruding portion 20 a of the mating component fixing pin 20 is slightly misaligned with the axial end portion of the guiding groove 12, the misalignment is absorbed and the mating component fixing pin 20. The protruding portion 20a can be naturally along the guide groove 12.

  When the positioning of the protruding part 20a of the mating part fixing pin 20 with respect to the guide groove 12 is completed, the projecting part 20a of the mating part fixing pin 20 extends along the guide groove 12 as shown in the side view of FIG. The outer cylinder 2 is inserted into the outer cylinder insertion portion 23 of the mating part 21 so as to be guided. When the protruding portion 20a of the mating component fixing pin 20 guided in the guide groove 12 abuts against the innermost wall portion 12a of the guiding groove 12 (see FIG. 8B), the mating component fixing pin 20 is Push into the positioning hole 13 from the outside of the component 21. As a result, as shown in the top view of FIG. 7C, the outer cylinder 2 is attached to the counterpart part 21, and the outer cylinder 2 is fixed to the counterpart part 21 in the axial direction by the counterpart part fixing pin 20. Further, the rotation of the outer cylinder 2 can also be stopped by passing the mating part fixing pin 20 from the mating part 21 to the outer cylinder 2.

  The fitting of the mating part fixing pin 20 into the positioning hole 13 is preferably an intermediate fit because the outer cylinder 2 may be distorted if it is an interference fit. Alternatively, the counterpart component fixing pin 20 may be fixed to the positioning hole 13 using an adhesive or the like.

  Alternatively, the mating component fixing pin 20 may be a rod tip screw with a pin at the tip of the screw, and the mating component fixing pin 20 may be inserted so as to be screwed into the pin through hole 22 of the mating component 21. Even in such a case, the mating component fixing pin 20 has a pin through hole so that the length h of the protruding portion 20a from the inner peripheral surface of the outer cylinder insertion portion 23 of the mating component 21 is equal to or less than the depth of the guide groove 12. 22 is inserted.

  Further, the positioning hole 13 provided flush with the guide groove 12 does not necessarily have to be provided at the innermost end portion of the guide groove 12, and any of the guide grooves 12 formed on the outer peripheral surface of the outer cylinder main body 9. It may be provided at a position. When the positioning hole 13 is provided at a portion other than the innermost end of the guide groove 12, the outer cylinder 2 is moved to the counterpart part so that the protruding part 20 a of the counterpart part fixing pin 20 is along the bottom part of the guide groove 12. The positioning hole 13 can be easily found by inserting it into 21.

  Next, a second embodiment of the present invention will be described. As shown in FIG. 9, the spline of this embodiment is similar to the first embodiment in that the spline shaft 1, the outer cylinder 2 assembled so as to be linearly movable relative to the spline shaft, and the spline. It consists of a plurality of balls 3 rolling on a ball circulation path 10 including a loaded ball rolling path composed of a ball rolling groove 1a of the shaft 1 and a loaded ball rolling groove 9a of the outer cylinder 2. In 2nd embodiment, the same code | symbol is attached | subjected to the same element as 1st embodiment, and the description is abbreviate | omitted.

  In the second embodiment, as in the first embodiment, the outer cylinder 2 is formed with a guide groove 30 for guiding the mating component fixing pin 20 along the spline shaft 1 from the axial end. Yes. However, as a difference from the first embodiment, no positioning hole is provided in the guide groove 30 of the second embodiment. As described above, the positioning hole serves to fix the outer cylinder in the axial direction with respect to the mating component by fitting the mating component fixing pin. In the second embodiment, as a function of fixing in the axial direction, a retaining ring 31 is provided as shown in FIG. 9 instead of the positioning hole. The retaining ring 31 is used for normal axial positioning and retaining. The rotation can be prevented by engaging the mating part fixing pin 20 with the guide groove 30.

  Next, a method for attaching the spline in the second embodiment to the counterpart component (housing) will be described.

  The mating component fixing pin 20 is inserted into the pin through hole 22 of the mating component 21, and then the protruding portion 20 a of the mating component fixing pin 20 is guided to the guide groove 30 from the axial end of the guide groove 30. The process up to inserting the outer cylinder 2 into the outer cylinder insertion portion 23 of the counterpart part 21 is the same as that in the first embodiment described above. In the second embodiment, after the outer cylinder 2 is inserted into the outer cylinder insertion portion 23 of the counterpart component 21, the retaining ring 31 is attached from the outside of the end cap 8 of the outer cylinder 2, and the axial movement of the outer cylinder 2 is performed. To prevent.

  Next, a screw device according to a third embodiment of the present invention will be described. FIG. 10 is a perspective view of the screw device according to the third embodiment. The screw device 50 is a screw shaft 51 as a track shaft in which a spiral ball rolling groove 51a is formed on the outer peripheral surface, and a moving member in which a spiral load ball rolling groove 52a is formed on the inner peripheral surface. A nut 52. The nut 52 includes a nut body 54 and end caps 55 as lid members attached to both ends of the nut body 54 in the axial direction. The nut main body 54 is formed with a no-load return passage 56 that constitutes a part of the ball circulation path. The end cap 55 is formed with a direction change path 55 a that connects the loaded ball rolling groove 52 a and the no-load return path 56. A plurality of balls 57 are arranged in the ball circulation path.

  A guide groove 58 is formed on the outer peripheral surface of the nut 52 across the end cap 55 and the nut body 54. The guide groove 58 formed in the end cap 55 is formed so that the end portion side of the nut 52 is wider than the nut body 54 side. By thus forming the guide groove 58 in the end cap 55 in a trumpet shape, the mating part fixing pin 59 can be easily passed through the guide groove 12. A positioning hole 60 is formed at the innermost end of the guide groove 58. The positioning hole 60 is substantially circular in accordance with the shape of the counterpart component fixing pin 59. A mating part fixing pin 59 guided in the guide groove 58 is fitted into the positioning hole 60. The mating part fixing pin 59 fitted in the positioning hole 60 plays a role of fixing the nut 52 to the mating part in the axial direction. The method of attaching the nut 52 to the housing of the mating part is the same as the spline of the first embodiment.

  The exercise device of the present invention is not limited to the above embodiment, and can be embodied in other embodiments without changing the gist of the present invention. For example, the exercise device of the present invention can be applied not only to a small spline but also to a large spline as long as the pin can transmit torque. Moreover, the exercise device of the present invention can be applied to a return pipe type or deflector type screw device in addition to the end cap type screw device of the above-described embodiment. In addition to the ball, a roller may be used as the rolling element.

  Further, when the above-described spline and screw devices shown as the embodiments are to be miniaturized as much as possible, the outer cylinders and nuts provided in these devices have small outer diameters and are easily deformed by an external force or the like. For this reason, it is desirable that the guide grooves 12 (30, 58) provided in the outer cylinder and the nut have a necessary minimum depth and a length as short as possible. With this configuration, deformation of the outer cylinder and the nut can be minimized.

The disassembled perspective view which shows the spline of 1st embodiment of this invention. The perspective view which shows the spline of 1st embodiment of this invention. Perspective view of outer cylinder body End cap perspective view Sectional view perpendicular to the axial direction of the spline The figure which shows the ball circulation path formed in an outer cylinder Process diagram when attaching spline to mating part (housing) ((a) is a top view, (b) is a side view, (c) is a top view) The figure which shows the process in which the other component fixing pin guided to a guide groove fits into a positioning hole The side view (including a partial cross section) which shows the spline of 2nd embodiment of this invention The perspective view (including a partial cross section) which shows the screw device of 3rd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Spline shaft (track axis), 1a ... Ball rolling groove (rolling element rolling part), 2 ... Outer cylinder (moving member), 3 ... Ball (rolling element), 8 ... End cap (lid member), 9 ... outer cylinder main body (moving member main body), 9a ... loaded ball rolling groove (loaded rolling element rolling portion), 9b ... no-load return passage, 10 ... ball circulation path, 12 ... guide groove, 12a ... innermost wall portion , 13 ... positioning hole, 20 ... mating part fixing pin, 20a ... projecting part, 21 ... mating part, 22 ... pin through hole, 23 ... outer cylinder insertion part (moving member insertion part), 30 ... guide groove, 31 ... Retaining ring, 51a ... Ball rolling groove (rolling element rolling part), 51 ... Screw shaft (track axis), 52 ... Nut (moving member), 52a ... Loaded ball rolling groove (load rolling element rolling part), 54 ... Nut body (moving member body), 55 ... End cap (lid member), 55a ... Direction change path, 5 ... unloaded return path, 57 ... ball (rolling elements), 58 ... guide groove, 59 ... the mating component for fixing pin, 60 ... positioning hole

Claims (14)

An orbital axis on which rolling element rolling parts are formed;
A moving member having a rolling element circulation path including a loaded rolling element rolling part that is assembled so as to be relatively movable with respect to the track shaft and that faces the rolling element rolling part,
A plurality of rolling elements arranged in the rolling element circulation path of the moving member;
A guide groove formed on the outer peripheral surface of the moving member from the axial end to a predetermined position along the axial direction, for guiding the mating component fixing pin;
An exercise device comprising:   2. The exercise device according to claim 1, wherein a positioning hole is formed in the guide groove to dig deeper than the guide groove to fit the mating part fixing pin.   The exercise device according to claim 2, wherein the positioning hole is formed in an innermost end portion of the guide groove.   The exercise device according to claim 2 or 3, wherein a diameter of the positioning hole is slightly smaller than a width of the guide groove in a direction orthogonal to the track axis.   The moving member has the load rolling element rolling section and a moving member main body having a no-load return passage constituting a part of the rolling element circulation path, and provided at both ends of the moving member main body in the moving direction. A pair of lid members having a direction change path connecting the loaded rolling element rolling portion and the no-load return passage, and the guide groove is formed from at least one lid member to the moving member main body. The movement according to any one of claims 1 to 4, wherein the guide groove of the lid member is wider from the end on the moving member main body side toward the end of the moving member. apparatus. A rolling shaft having a rolling element rolling path including a loaded rolling element rolling part that is assembled so as to be relatively movable with respect to the orbiting axis and is opposed to the rolling element rolling part. A plurality of rolling elements arranged in the rolling element circulation path of the moving member, and an exercise device having a guide groove formed on an outer peripheral surface of the moving member from an axial end portion to a predetermined position along the axial direction; ,
A moving member insertion portion into which the moving member of the exercise device is inserted, and a mating part having a pin through hole connected to the inner peripheral surface of the moving member insertion portion;
A mating part fixing pin that is inserted into the pin through hole and engages with the guide groove of the moving member to fix the mating part and the moving member;
A structure for fixing an exercise device to a mating part.   The structure for fixing an exercise device to a mating part according to claim 6, wherein a width of the guide groove in a direction perpendicular to the track axis is slightly larger than a diameter of the mating part fixing pin.   8. The mating part according to claim 6, wherein a positioning hole is formed in the guide groove to dig deeper than the guide groove to fit the mating part fixing pin. 9. Fixed structure of exercise equipment.   The structure for fixing an exercise device to a mating part according to claim 8, wherein the positioning hole is formed at the innermost end of the guide groove.   7. The mating part according to claim 6, wherein the structure for fixing the exercise device to the mating part further includes a retaining ring for stopping the movement of the moving member relative to the mating part in the axial direction. Fixed structure of exercise equipment.   The moving member of the exercise device has the load rolling element rolling section and a moving member main body having a no-load return passage that constitutes a part of the rolling element circulation path, and a moving direction of the moving member main body. A pair of lid members provided at both ends and having a direction change path connecting the loaded rolling element rolling portion and the no-load return passage, and the guide groove extends from at least one lid member to the moving member body The guide groove of the lid member is formed to extend from an end portion on the moving member main body side toward an end portion of the moving member. Fixing structure of exercise device to other parts. A track having a rolling element rolling section including a rolling element rolling path that includes a raceway axis formed with a rolling element rolling part and a load rolling element rolling part that is assembled so as to be relatively movable with respect to the raceway axis and faces the rolling element rolling part. A member, a plurality of rolling elements arranged in the rolling element circulation path of the moving member, and a counterpart component fixing formed on an outer peripheral surface of the moving member from an axial end to a predetermined position along the axial direction In the fixing method of the exercise device to the counterpart component for attaching the exercise device comprising the guide groove for guiding the pin to the counterpart component,
The counterpart component has a moving member insertion portion into which the moving member of the exercise device is inserted, and a pin through hole connected to the inner peripheral surface of the moving member insertion portion,
A mating part fixing pin for fixing the mating part and the moving member is inserted into the pin through hole, and the protruding part of the mating part fixing pin on the inner peripheral surface of the mating part moving member insertion portion is inserted. A pin insertion step of projecting the counterpart component fixing pin so that the length is equal to or less than the depth of the guide groove;
A moving member inserting step of inserting the moving member into the moving member inserting portion so that the protruding portion of the mating part fixing pin is guided along the guide groove from the axial end portion of the moving member. Fixing the exercise device to the mating part. A positioning hole is formed in the guide groove to dig deeper than the guide groove to fit the mating component fixing pin.
The mating part fixing pin according to claim 12, wherein, in the moving member inserting step, after the mating part fixing pin is guided to the positioning hole, the mating part fixing pin is pushed into the positioning hole. How to fix the exercise device.   The counterpart component according to claim 12, further comprising a moving member fixing step of stopping the movement of the movable member in the axial direction with respect to the counterpart component using a retaining ring after the moving member insertion step. To fix the exercise device to the body.

Images