JPH0566329U - Direct acting guide device - Google Patents

Abstract

(57) [Summary] [Structure] In this direct-acting type guide device, a moving body 2 is slid on a guide rail 1 via a ball 16. Ball 16
It circulates in the ball circulation path 15 as the moving body 2 moves.
The ball circulation path 15 includes a ball outward path 12 and a ball return path 1
3 and an inversion path 14 connecting them. The cylindrical guide portion 22 on the inner peripheral side of the reversing path 14 was magnetized so that the balls 16 were attracted to the inner peripheral side of the reversing path 14. [Effects] The straightness of the ball 16 can be softened and the ball 16 can be smoothly introduced into the reversal path 14, and the occurrence of vibration can be prevented. It is possible to avoid collision between the ball 16 and the lip portion 14c that is an introduction portion to the outer peripheral side of the reversal path 14, and it is possible to improve durability.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a direct-acting guide device, and more particularly to a direct-acting guide device having a linear guide rail and a moving body having a substantially inverted U-shaped cross section and moving across the guide rail. Is.

[0002]

[Prior Art]

 Conventionally, the above direct-acting guide device has ball guide grooves formed on both side surfaces of the guide rail and on both sides of the movable body facing the both side surfaces of the guide rail. An outward path is formed, and ball return paths are formed on the leg portions on both sides of the moving body, and the ends of the ball outward path and the ends of the ball returning path are connected by the inversion paths formed at both ends of the moving body. In some cases, a ball circulation path is formed, and a plurality of balls rolling between the movement body and the guide rails are enclosed in the ball circulation path of the moving body (for example, see Japanese Utility Model Laid-Open No. 1-60020). ).

Usually, the moving body is formed of a resin end cap portion at both front and rear ends and a remaining metal intermediate portion, and the concave groove surface formed in the end cap portion causes the reversing path to move. An outer peripheral side guide surface is configured.

[0004]

[Problems to be solved by the device]

 By the way, when the ball enters the reversal path from the outward path, it switches from the loaded state to the unloaded state, so the movement of the ball is jerky in this part, and there is a tendency that the smooth reversal operation cannot be performed. In particular, since the inertial force that moves the ball in a straight line acts on the ball that has traveled in a straight line until then, when the ball enters the above-mentioned inversion path, the ball is There was a problem that the moving body vibrates as a result of colliding with the introduction lip part on the side guide surface and impacting the end cap part. Further, there is a possibility that the introduction lip portion may be damaged due to the collision of the ball.

Therefore, an object of the present invention is to provide a direct-acting guide device that can smoothly invert a rolling element, prevent vibration from occurring, and has excellent durability.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a direct acting guide device according to the present invention comprises a linear guide rail and a movable body having a substantially inverted U-shaped cross section that moves across the guide rail. Rolling element guide grooves are formed on the side surfaces and on both sides of the moving body on opposite sides of the guide rail.The rolling element guide grooves form the rolling element forward path. A rolling element return path is formed in each leg, and the rolling element forward path end and the rolling element return path end are connected by the reversing paths formed at both ends of the moving body to form a rolling element circulation path. In a direct-acting guide device in which a rolling element consisting of a plurality of magnetic elements rolling between the moving element and a guide rail is enclosed in the rolling element circulation path of the moving element, Of magnetic force that attracts to the inner circumference of It is characterized in that provided on the reversing path forming member.

[0007]

[Action]

 According to the linear motion guide device having the above configuration, when the rolling element approaches the reversing path, the magnetic force of the magnetic force generation portion attracts the rolling element to the inner peripheral side of the reversing path. The rolling element can be smoothly introduced into the inversion path in a softened state. Further, when the rolling element is introduced into the reversing path, it is possible to avoid a collision between the rolling element and a portion on the outer peripheral side of the reversing path.

[0008]

【Example】

 Embodiments will be described in detail below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a direct-acting guide device as an embodiment of the present invention, FIG. 2 is a II-II cross-sectional view thereof, and FIG. 3 is an exploded perspective view thereof. With reference to these drawings, this linear guide device comprises a linear guide rail 1 and a moving body 2 having a substantially inverted U-shaped cross section and moving across the guide rail 1.

Ball guide grooves 3 each having two arc-shaped portions are formed on both left and right side surfaces of the guide rail 1. The moving body 2 is composed of end cap portions 4 at the front and rear ends, and the remaining intermediate portion 5, and these portions further include left and right leg-shaped portions 6 and 7, and left and right side leg-shaped portions 6 and 7. It is composed of connecting portions 8 and 9 for connecting the upper ends to each other. Ball guide grooves 11 formed of two arc-shaped portions facing the ball guide groove 3 are formed on the opposite left and right side surfaces of the guide rail 1 in the left and right leg-shaped portions 7 of the intermediate portion 5. A ball forward path 12 is formed by the ball guide groove 3 of the guide rail 1 and the ball guide groove 11 of the intermediate portion 5 of the moving body 2. Further, straight hole-shaped ball return paths 15 are formed in the left and right leg-shaped portions 7 of the intermediate portion 5 of the moving body 2, respectively. The end of the ball outward path 12 and the end of the ball return path 12 are connected by a pair of reversal paths 14 formed at both ends of the moving body 2 to form an endless ball circulation path 15. A plurality of balls 16 are enclosed in each ball circulation path 15. The ball 16 contacts the arcuate portions of the ball guide grooves 3 and 11 in the ball outward path 12.

An arcuate recess 17 is formed on a surface of the end cap portion 1 that faces inward in the front-rear direction. A ball guide groove 19 having one end connected to the ball guide groove 11 of the ball outward path 12 is formed on the inner peripheral surface of the recess 17. Further, a magnetized semi-cylindrical guide portion 22 serving as a magnetic force generating portion is interposed between the end cap portion 1 and the end surface of the intermediate portion 5, and the guide portion 22 includes the end cap portion 1 or the intermediate portion. It is fixed to any one of 5. On the cylindrical surface of the guide portion 22, a ball guide groove 23 is formed, one end of which is connected to the ball guide groove 11 and the other end of which is connected to the ball return path 13. The ball guide groove 23 of the guide portion 22 and the ball guide groove 19 of the recess 17 form the reversal path 14, and the inner peripheral surface of the ball guide groove 19 forms the outer guide surface of the reversal path 14. 14a is formed, and the inner peripheral surface of the ball guide groove 23 forms the inner peripheral side guide surface 14b of the reversal path 14. At the connecting portion of the outer peripheral side guide surface 14a to the ball guide groove 11, the end cap portion 1 has a tapered lip portion 14c.

Next, the operation of this linear motion guide device will be described. When the moving body 2 is moved along the guide rail 1, the balls 16 in the ball outward path 12 roll along the guide rail 1 and the ball guide grooves 3, 11 of the intermediate portion 5 as the moving body 2 moves, It moves behind the moving body 2 in the moving direction of the moving body 2. Therefore, the ball 16 in the ball forward path 12 sequentially enters the reversing path 14 at the rear end of the moving direction, the ball 16 in the reversing path 14 sequentially enters the ball returning path 13, and the ball 16 in the ball returning path 13 Sequentially enters the ball outward path 12 through the inversion path 14 at the front end in the moving direction. Thus, the ball 16 circulates in the ball circulation path 15.

According to this embodiment, when the ball 16 approaches the reversing path 14 on the side where the ball 16 is introduced from the ball outward path 12 (on the rear end side in the moving direction of the moving body 2), the ball 16 is partially moved. The magnetic force of the cylindrical guide portion 22 attracts the inner peripheral side of the inversion path 14. As a result, the ball 16 can smoothly enter the inversion path 14 in a state in which the straightness of the ball 16 that has traveled in a straight line up to that time is softened, so that the impact of the ball 16 on the end cap portion 1 is reduced. Can be mitigated to prevent the occurrence of vibration. In particular, since it is possible to prevent the ball 16 from colliding with the lip portion 14c of the resin-made end cap portion 1, it is possible to prevent the above vibration and improve the durability of the end cap portion 1.

On the other hand, when the ball 16 exits the reversing path 14 on the side of introducing the ball 16 into the ball outward path 12 (on the front end side in the moving direction of the moving body 2) and enters the ball outward path 12, the ball 16 moves to the ball 16. Since the impact of the centrifugal force on the ball 16 against the ball guide groove 3 of the guide rail 1 can be weakened, it is possible to prevent the occurrence of vibration associated with the collision. In this way, the reversal operation of the ball 16 including the entry into the reversal path 14 and the exit from the reversal path 14 can be smoothly performed, whereby the occurrence of vibration is prevented and the durability is improved. Can be planned.

The present invention is not limited to the above-described embodiment, and any magnetic force generating unit may be used as long as it can attract the ball 16 to the inner peripheral side of the reversing path 14. Therefore, for example, at least the groove bottom portion of the ball guide groove 23 of the guide portion 22 may be magnetized. Further, instead of the magnetization of the guide portion 22 or in addition to the magnetization of the guide portion 22, the crowning portion 24 (see FIG. 4) on the inner circumference of the guide rail groove 11 may be magnetized.

Further, the semi-cylindrical guide portion 22 may be integrally formed at the end portion of the intermediate portion 5, and at least one of the guide portion 2 and the crowning portion 24 may be magnetized. In addition, as the magnetic force generating portion, as shown in FIG. 5, a permanent magnet 25 housed in the recess 26 at the end of the intermediate portion 5 can be used.

In addition, various design changes can be made without changing the gist of the present invention.

[0017]

[Effect of the device]

 As described above, according to the linear guide device of the present invention, when the rolling element hits the reversing path, the magnetic force of the magnetic force generating portion causes the magnetic force to be attracted to the inner peripheral side of the reversing path. The rolling element can be smoothly introduced into the reversing path in a state where the straightness due to inertia is moderated, and the occurrence of vibration can be prevented. Further, when the rolling element is introduced into the reversing path, it is possible to avoid a collision between the rolling element and the introduction portion on the outer peripheral side of the reversing path, so that durability can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a linear guide device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an exploded perspective view of a linear guide device.

FIG. 4 is a cross-sectional view of a direct acting guide device according to another embodiment.

FIG. 5 is a cross-sectional view of a direct acting guide device according to still another embodiment.

[Explanation of symbols]

 1 guide rail 2 moving body 3 ball guide groove 5 middle part 7 leg part 11 ball guide groove 12 ball concave path 13 ball return path 14 reversing path 15 ball circulation path 16 ball 22 guide part (magnetic force generating part) 24 crowning part (magnetic force) Generation unit) 25 Permanent magnet (Magnetic force generation unit)

Claims (1)

[Scope of utility model registration request] 1. A linear guide rail, and a moving body having a substantially inverted U-shaped cross section and moving across the guide rail.
Rolling element guide grooves are formed on both sides of the guide rail and on both sides of the moving body that face the opposite sides of the guide rail, respectively, and both rolling element guide grooves form a rolling element forward path, Rolling element return paths are formed in the leg-shaped parts on both sides, and the rolling element forward path ends and the rolling element return path ends are connected by the reversing paths formed at both ends of the moving body to form a rolling element circulation path. In a direct-acting guide device in which a rolling element consisting of a plurality of magnetic elements that rolls between the moving element and a guide rail is enclosed in the rolling element circulation path of the moving element, A direct-acting guide device, characterized in that a magnetic force generating portion for attracting to the inner peripheral side of the is provided in the reversal path forming member.