JP2013106498A - Linear motion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a very highly practical linear motion device that easily achieves a configuration in which heat from a movable element is hard to be conducted to a table body and that minimizes deformation of the table body or the like.SOLUTION: A linear motion device is provided with a linear motor that includes: a rail body 2 that has a stator 1; and a table body 4 that has a movable element 3 which is arranged so as to face the stator 1. The movable element 3 has a synthetic resin contact portion with the table body 4.

Description

  The present invention relates to a linear motion device including a linear motor.

  Conventionally, as disclosed in, for example, Patent Document 1, a linear motion including a rail having a fixed stator and a so-called moving coil type linear motor having a movable element fixed to a table that moves relative to the rail. There is a device.

  This linear motion device moves the table relative to the rail by energizing the coil of the mover, but the coil generates heat when energized, and the heat is held by the table or table to which the mover is fixed. If it is transmitted to a workpiece or the like, it may deform due to thermal expansion and cause problems such as deterioration of accuracy.

  In particular, the coil frame that holds the coil of the mover is often made of metal such as aluminum, and the coil frame and the metal (aluminum) table are in contact with each other, so heat is transferred from the mover to the table or the like. easy.

JP 2003-32996 A

  The present invention has been made in view of the current situation as described above, and can easily realize a configuration in which heat from the mover is not easily transmitted to the table, and is extremely practical in that it can suppress deformation of the table and the like as much as possible. A linear motion device is provided.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A linear motion device including a linear motor including a rail body 2 provided with a stator 1 and a table body 4 provided with a mover 3 disposed opposite to the stator 1, wherein the mover 3 The contact portion with the table body 4 is made of a synthetic resin and is related to a linear motion device.

  The linear motion device according to claim 1, wherein the mover 3 includes a coil 5 and a coil frame 6 that holds the coil 5, and the coil 5 and the coil frame 6 are integrally formed of a synthetic resin. The linear motion device is characterized in that it is molded and the coil frame 6 is provided with a contact portion with the table body 4.

  The linear motion device according to claim 2, wherein the movable element 3 is provided with an insertion hole portion 8 through which a screw 7 for fixing the movable element 3 and the table body 4 is inserted, and the insertion hole portion 8. Is made of a synthetic resin, and relates to a linear motion device.

  The linear motion device according to claim 3, wherein the insertion hole portion 8 is provided in the coil frame 6.

  The linear motion apparatus according to any one of claims 1 to 4, wherein the synthetic resin is an epoxy resin or an unsaturated polyester resin.

  Since the present invention is configured as described above, it is possible to easily realize a configuration in which heat from the mover is not easily transmitted to the table body, and it is possible to suppress deformation of the table body as much as possible. It becomes a moving device.

It is a partial cross section front view of a present Example. It is a schematic explanatory perspective view of the principal part of a present Example.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  Since the contact portion between the mover 3 and the table body 4 is made of a synthetic resin, the heat conduction is extremely smaller than that of metal, and therefore the heat of the mover 3 (coil 5) is difficult to be transmitted to the table body 4 and the like. Thus, the deformation of the table body 4 and the like is suppressed as much as possible.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is a linear motion device provided with a linear motor comprising a rail body 2 provided with a stator 1 and a table body 4 provided with a mover 3 arranged opposite to the stator 1. The contact portion of the mover 3 with the table body 4 is made of synthetic resin.

  Each part will be specifically described.

  As shown in FIG. 1, the rail body 2 is made of steel having a U-shape in a cross-sectional view extending linearly and having a pair of steel upright portions 12 (yoke) for attaching permanent magnets at the bottom. Is adopted.

  The standing portion 12 is a thin plate and extends in a straight line with substantially the same length as the entire length of the rail body 2, and a permanent magnet 16 is provided on the inner surface of the standing portion 12 along the longitudinal direction of the rail body 2. Many are arranged side by side so that different polarities appear alternately. The permanent magnet 16 and the upright portion 12 (yoke) constitute the stator 1.

  The table body 4 is made of steel to which a workpiece or the like is attached, and is provided so as to move along a linear guide along the rail body 2 via a steel block body 9.

  Specifically, the block body 9 has a substantially reverse concave shape in cross-sectional view in which sleeve portions are suspended from the left and right sides of the base portion, and the left and right sleeve portion outer surfaces of the block body 9 and the left and right wall portion inner surfaces of the rail body 2 A load path 10 is provided between the two. The left and right sleeves of the block body 9 are provided with straight holes to be the no-load path 11 and both ends of the no-load path 11 and the load path 10 are connected by a semicircular return path (not shown). Thus, a so-called infinite circulation path is formed (in this embodiment, a pair of left and right infinite circulation paths is formed in two upper and lower sides), and a large number of rolling elements (steel balls) are arranged in this infinite circulation path. A moving mechanism is configured.

  As shown in FIG. 2, the coil 5 of the mover 3 attached to the lower surface side of one end of the table body 4 is disposed in the opposing space portions of the permanent magnets 16 provided in the pair of standing portions 12 of the rail body 2. A thin plate-like passage portion 15 to be embedded is disposed.

  Therefore, as in a general moving coil type linear motor, a current is passed through the coil 5 of the mover 3 disposed between the permanent magnets to generate a magnetic field, thereby generating a thrust by the interaction with the permanent magnet 16. The table body 4 can be moved in a linear guide with respect to the rail body 2 via the rolling mechanism.

  The mover 3 includes a coil 5 (attached to the aluminum base) and a coil frame 6 that holds the coil 5. The coil frame 6 (whole) is integrally formed by a general resin mold molding in which a coil 5 (including an aluminum base) is sealed using a mold. As this resin, a general synthetic resin (plastic resin) such as an epoxy resin or an unsaturated polyester resin can be employed. In this embodiment, an epoxy resin is employed.

  The left and right protrusions 14 provided at the upper end of the coil frame 6 are provided with insertion holes 8 (straight holes) through which screws 7 for fixing to the table body 4 are inserted.

  Therefore, the flat upper surface of the coil frame 6 and the flat lower surface of the table body 4 are brought into close contact with each other by screwing the screw portion of the screw 7 through the insertion hole and the insertion hole portion 8 of the table body 4 and screwing them onto the nut 13. Both are fixed.

  In this embodiment, the entire coil frame 6 including the contact portion with the table body 4 and the insertion hole portion 8 is integrally formed by molding, but at least a part including the contact portion with the table body 4 is formed. Only molding may be performed, and the others may be retrofitted. For example, only a portion excluding the protruding portion 14 provided with the insertion hole portion 8 may be molded and the protruding portion 14 may be retrofitted.

  Synthetic resins such as epoxy resins have extremely low thermal conductivity compared to metals (aluminum, etc.), and therefore the coil 5 and the metal table body that generate heat when energized by integrally forming the coil frame 6 by molding. 4 is not in direct contact with each other, and is not provided continuously through metal, so that the heat of the coil 5 is extremely difficult to be transferred to the table body 4 (and the work provided on the table body 4), and these heating are possible. To be suppressed.

  That is, not only the portion of the movable element 3 that directly contacts the table body 4 becomes the mold resin, but also the portion where the screw 7 that connects the movable element 3 and the table body 4 comes into contact with the mold resin by using a nut. Thus, the mold resin always exists in the heat transfer path from the coil 5 to the table body 4, and the heat conduction to the table body 4 can be made extremely small. It should be noted that when the aluminum base is tapped and fixed, heat is transmitted to the table body 4 through a screw, and when the screw is cut in the mold resin portion, the strength is insufficient, which is not preferable.

  Therefore, the present embodiment can easily realize a configuration in which heat from the mover is not easily transmitted to the table body, and is extremely practical in that it can suppress deformation of the table body as much as possible.

DESCRIPTION OF SYMBOLS 1 Stator 2 Rail body 3 Movable element 4 Table body 5 Coil 6 Coil frame 7 Screw 8 Insertion hole part

Claims (5)

  A linear motion device comprising a linear motor comprising a rail body provided with a stator and a table body provided with a mover disposed opposite to the stator, the linear motion device comprising: A linear motion device characterized in that the contact portion is made of a synthetic resin.   2. The linear motion device according to claim 1, wherein the mover includes a coil and a coil frame that holds the coil, and the coil and the coil frame are integrally molded with a synthetic resin. A linear motion device, wherein the frame is provided with a contact portion with the table body.   The linear motion device according to claim 2, wherein the movable element is provided with an insertion hole portion through which a screw for fixing the movable element and the table body is inserted, and the insertion hole portion is made of a synthetic resin. A linear motion device characterized by comprising:   The linear motion device according to claim 3, wherein the insertion hole is provided in the coil frame.   5. The linear motion device according to claim 1, wherein the synthetic resin is an epoxy resin or an unsaturated polyester resin.

Images