JP2017067077A - Linear motion guide bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motion guide bearing device having a needle which can cope with a long stroke, has no risk of contact with an upper face cover, is compact in size, and low in cost.SOLUTION: An upper face cover for making a support in the vicinity of both ends of a needle stroke at a stator side is formed of a magnetic body. A permanent magnet is arranged at an internal peripheral lower face of a needle which opposes an upper side face of the upper face cover out of the needles surrounding the upper face cover at left-and-right vertical internal peripheral four faces in a cross section which is vertical to an axial direction of a linear motion guide bearing device. The compact and low-cost needle can be provided having no risk of contact with the upper face cover even if the upper face cover is employed to the linear guide bearing device by sucking the upper face cover in an anti-gravity direction by a magnetic force of the permanent magnet.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a linear motion guide bearing device used in, for example, industrial robots and various machine tools, and more particularly to cover a gap between a stator and a mover of a linear motion guide bearing device having a long stroke (stroke). The present invention relates to a cover to be provided and a mover.

  Conventionally, a linear motion guide bearing device driven by a ball screw, a belt, a linear motor or the like has been used as an important machine element of many industrial machines. These linear motion guide bearing devices are commonly required to have characteristics such as smooth and stable operability of the mover relative to the stator, low noise and long life. However, in such a linear motion guide bearing device, the mover moves by the stroke of the mover set on the stator side, and the stator portion not facing the mover is exposed to the outside. In addition, for example, during inspection, the tool may be dropped from the top surface of the stator into the linear motion guide bearing device to damage the stator part directly, or the device may be operated without being aware of small foreign objects that have fallen or entered. There is a problem that the moving accuracy of the mover is hindered due to dust entering into the grooves and gaps on the stator side as it is used for a long period of time, and the smooth operation of the mover is hindered. It was.

  As a prior art for improving this part, there is Patent Document 1 (Japanese Patent Laid-Open No. 2001-116042), and as shown in the perspective view of FIG. 3 (a), the slide part (movable element) 11 moves. A linear motion guide bearing device is disclosed in which a top cover 39 extending over a stroke is attached to end plates 41, 41 and a slide portion (movable element) 11 is driven by a drive motor 17.

JP 2001-116042 A

  In this prior art, as shown in FIG. 3B, the ball screw shaft 25 is rotated by the drive motor 17 described above, whereby the inner surface 21c of the guide rail (stator) 21 and the movable body (movable) The slide portion (movable element) 11 is moved by a linear motion guide bearing mechanism composed of grooves 21d and 23d and balls 51 provided on the side surfaces 23c of the element 23). However, as is apparent from the cross-sectional view of FIG. 3B, the upper surface cover 39 disclosed in this prior art has a flat plate shape, and the guide member is a guide rail (stator) 21. In the setting method of the upper surface cover 39 that is supported at two points by the end plates 41, 41 near both ends in the axial direction, when the linear motion guide bearing device becomes a long stroke product, the flatness cannot be maintained by the deflection due to its own weight. When the slide part (movable element) 11 surrounding the cover moves, the upper surface cover 39 may come into contact with the inner surface side of the slide part 11, and the smooth operation of the movable element is hindered. was there.

  Accordingly, the present invention has been made paying attention to the problems of the prior art described above, and an object of the present invention is to provide an upper surface cover that is supported in the vicinity of both ends of the mover stroke on the stator side in the linear motion guide bearing device. Among the movers that surround the top cover with the four upper and lower inner peripheral surfaces in the cross section perpendicular to the axial direction of the linear motion guide bearing device, A permanent magnet is provided on the lower and lower surfaces, and the upper cover is attracted in the anti-gravity direction by its magnetic force. Is provided at a low cost.

  In order to solve the above-described problem, a linear motion guide bearing device according to claim 1 of the present invention includes a stator that can serve as a base, a mover on which a load can be mounted, and the mover with respect to the stator. A linear motion guide bearing that guides a linear stroke so as to be movable by a predetermined stroke, an upper surface cover that is provided in the stator and that covers a gap of the stator for the stroke that the movable element moves, and the stator In a linear motion guide bearing device comprising a drive mechanism capable of linearly moving the mover, the material of the upper surface cover is a magnetic material, and the mover has an upper, lower, left and right inner peripheral four surfaces. Further, a permanent magnet is provided on the inner peripheral lower surface that surrounds and faces the upper surface of the upper cover. In the linear motion guide bearing device according to claim 2 of the present invention, the permanent magnet is composed of a neodymium magnet.

  According to the present invention, the upper surface cover that is supported in the vicinity of both ends of the mover stroke on the stator side is made of a magnetic material, and the upper surface cover is formed in four cross sections perpendicular to the axial direction of the linear motion guide bearing device. Long-stroke linear motion guide bearing by providing a permanent magnet on the inner peripheral lower surface of the mover facing the upper surface of the upper cover, and attracting the upper cover in the anti-gravity direction by its magnetic force. Even when applied to the apparatus, it is possible to provide a movable element that does not come into contact with the upper surface cover in a compact and low-cost manner.

It is a figure which shows one Embodiment of the linear motion bearing guide apparatus to which the upper surface cover and movable element of this invention are applied, (a) is a top view, (b) is a side view. It is YY sectional drawing of FIG. 1 which is one Embodiment of this invention. It is a figure which shows the upper surface cover of the linear guide bearing apparatus of a prior art, (a) is the perspective view, (b) is II sectional drawing of (a).

  1 and 2 show an embodiment of a linear guide bearing device having a top cover to which the present invention is applied. As shown in these drawings, the linear motion guide bearing device 1 allows the mover 4 to move smoothly over the stator 3 and the entire stroke predetermined by the settings of the limit scale 7 and the limit sensor 8. Linear motion guide bearings 2 and 2 using rollers as rolling elements are provided on both sides of the mover 4. Further, the upper cover 5 of the present invention is made of a magnetic material over the entire stroke of the mover 4 with both ends in the axial direction fixed to the end plates 6 and 6 with the mover 4 surrounded by the upper, lower, left and right surfaces. It is a flat cover of the body.

On the other hand, on the mover inner peripheral lower surface 4a facing the upper side of the upper cover of the mover 4 surrounding the upper cover 5, a permanent magnet 10 is used to stably hold the mover inner peripheral lower surface 4a. A total of four pieces are attached with fixing bolts 10b on both sides in the stroke direction of the mover via the magnet holder 10a, with the left and right equally distributed at the center of the shaft. Thus, in the linear motion guide bearing device 1 in which the permanent magnet 10 is attached to the inner peripheral lower surface 4a of the mover and the magnetic material is used for the upper surface cover, the mover 4 moves a predetermined stroke of the linear motion guide device. When the mover approaches, the upper surface cover 5 is pulled up in the antigravity direction by the attractive force of the permanent magnet 10, so that it is compared with the deflection at the center of the stroke due to the weight of the upper surface cover under the condition that the attractive force does not act. Thus, the distance from the inner peripheral upper surface 4b of the mover can be increased, and it is possible to actively avoid the problem that the mover 4, particularly the inner peripheral upper surface 4b of the mover contacts the upper surface cover 5. Become.

  The “gap” between the permanent magnet 10 and the top cover 5 shown in FIG. 2 is set by adjusting the tension between the end plates 6 and 6 fixing the top cover 5. By setting the stroke length and the operation speed of the mover 4 to an optimum setting mainly considering the magnetic force (attraction force) depending on the relationship between the permanent magnet 10 and the material of the top cover 5 that is a magnetic body, There is no possibility of contact with the upper surface cover 5 when the mover 4 moves in the stroke, and the distance between the inner peripheral lower surface 4a of the mover and the inner peripheral upper surface 4b of the mover can be suppressed to the minimum necessary. It is possible to provide a linear motion guide bearing device capable of accommodating a long stroke with the child 4 having a small vertical thickness.

  In this embodiment, a linear motor is arranged in the center as the drive mechanism 9 for linearly moving the mover 4 with respect to the stator 3, and the stator 3 is connected to the stator side drive mechanism 9 a, and the mover 4 shows an example in which a mover side drive mechanism 9b is connected, and a linear motor is used to move the mover 4 with respect to the stator 3 in a desired operation. The linear motor is not limited to a linear motor, and a linear motion guide bearing device driven by a ball screw or a belt shown in FIG. Moreover, in this embodiment, although what used the roller for the rolling element of the linear motion guide bearing 2 was illustrated, it is not restricted to this, You may use a ball | bowl (ball).

  In this embodiment, two permanent magnets 10 attached to the inner peripheral lower surface 4a of the mover 4 are provided on both sides in the stroke direction of the mover 4. However, the present invention is not limited to this. Alternatively, one long permanent magnet that fits in the inner circumferential width direction of the mover (thin in the stroke direction) may be provided on each side of the stroke direction.

  Furthermore, in this embodiment, the permanent magnet 10 is illustrated as being attached to the inner peripheral lower surface 4a of the mover with the fixing bolt 10b via the magnet holder 10a. However, the total height of the magnet holder 10a on the inner peripheral lower surface 4a side of the mover is illustrated. When the outer circumference of the magnet holder 10a is used as the external thread and are combined, the protruding length of the permanent magnet 10 from the inner peripheral lower surface 4a is adjusted to a predetermined amount. In addition, it may be fixed with an adhesive or the like.

DESCRIPTION OF SYMBOLS 1 Linear motion guide bearing apparatus 2 Linear motion guide bearing 3 Stator 4 Movable element 4a Movable element inner peripheral lower surface 4b Movable element inner peripheral upper surface 5 Upper surface cover 6 End plate 7 Limit scale 8 Limit sensor 9 Drive mechanism 9a Drive mechanism (stator) side)
9b Drive mechanism (mover side)
DESCRIPTION OF SYMBOLS 10 Permanent magnet 10a Magnet holder 10b Fixing bolt 11 Slide part (movable element)
17 Drive motor 21 Guide rail (stator)
21c Guide rail inner peripheral surface 21d Guide rail side ball groove 23 Moving body (movable element)
23c Moving object side surface 23d Moving object side ball groove 25 Ball screw shaft 39 Upper surface cover 41 End plate 51 Ball

Claims (2)

A stator that can serve as a base; a mover on which a load can be mounted; a linear motion guide bearing that guides the mover on a straight line so as to be movable by a predetermined stroke; and the stator. In a linear motion guide bearing device comprising an upper surface cover that covers a gap of the stator for a stroke that the mover moves, and a drive mechanism that can linearly move the mover with respect to the stator. The upper cover is made of a magnetic material, and the mover surrounds the upper cover with four upper, lower, left and right inner peripheral surfaces, and further includes a permanent magnet on the inner peripheral lower surface facing the upper surface of the upper cover. A linear motion guide bearing device characterized by that. A stator that can serve as a base; a mover on which a load can be mounted; a linear motion guide bearing that guides the mover on a straight line so as to be movable by a predetermined stroke; and the stator. In a linear motion guide bearing device comprising an upper surface cover that covers a gap of the stator for a stroke that the mover moves, and a drive mechanism that can linearly move the mover with respect to the stator. The upper cover is made of a magnetic material, and the mover surrounds the upper cover with four upper and lower inner peripheral surfaces, and further has a neodymium permanent magnet on the inner peripheral lower surface facing the upper surface of the upper cover. A linear motion guide bearing device comprising:

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