JP2011223700A - Linear slider - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb elongation of stator due to thermal expansion and to firmly support an end part of the stator on a fixing base against a thrust generated by a mover.SOLUTION: A linear slider 1 includes a fixing base 30 for fixing a stator 10 and two support mechanisms 50, 60 for supporting both end portions in a longitudinal direction of the stator 10. The two support mechanisms 50, 60 include a first support part 70 fixed to the end portion in the longitudinal direction of the stator 10 and a second support part 80 fixed to the fixing base 30. The first support part 70 includes a convex portion 73. The second support part 80 includes a concave portion 83 which engages with the convex portion 73 and by which the convex portion 73 can move in an axial line direction, an end portion 84 provided in the deepest portion of the concave portion 83, and a spring 90 disposed in the concave portion 83 so as to be located between the end portion 84 and the convex portion 73.

Description

  The present invention relates to a linear slider provided with a cylindrical linear motor.

  FIG. 5 is a perspective view showing an example of the structure of a conventional linear slider. In FIG. 5, the linear slider 100 supports the stator 10 and the movable element 20 constituting the cylindrical linear motor, the fixed base 30 for fixing the stator 10, and both longitudinal ends of the stator 10. Two support mechanisms 150 and 160 are provided.

  A table 21 is attached to the mover 20 in a state of being inserted into the stator 10. A movable body (not shown) is attached to the table 21. The table 21 is supported by two blocks 22 and 22. The blocks 22 and 22 are mounted on two guide rails 23 and 23 arranged in parallel so as to be movable in the axial direction. Accordingly, the mover 20 is supported by the blocks 22 and 22 via the tables 21 and 21 and can move in the traveling direction D along the axial direction while being guided by the two guide rails 23 and 23.

  For example, Patent Literature 1 and Patent Literature 2 are known as disclosures of the same structure as described above.

  In the conventional linear slider 100 configured as described above, a magnetic field generated by a magnetic flux generated by a field (not shown) provided in the stator 10 and an energization current of an armature coil (not shown) provided in the mover 20. Due to the interaction, the mover 20 generates a thrust in the axial direction and moves in the traveling direction D. Thus, the linear slider 100 does not require a hydraulic device or a pneumatic device that is a necessary power source in a hydraulic cylinder or an air cylinder, and can be moved in the axial direction only by providing a power source. Can be suitably used.

  Here, both ends of the stator 10 are fixed by the support mechanisms 150 and 160, so that the stator 10 does not move in the traveling direction D. However, when both ends of the stator 10 are fixed, when the temperature of the stator 10 rises due to heat generated by the mover 20, the stator 10 is bent in the radial direction without absorbing the thermal expansion in the axial direction of the stator 10. There was a risk of falling.

  An example of the conventional support mechanism corresponding to this is disclosed in, for example, Patent Document 3. FIG. 6 is an exploded perspective view showing the structure of this conventional linear slider support mechanism, and FIGS. 7A and 7B are longitudinal sectional views thereof.

  In FIG. 6 and FIG. 7A, a support mechanism 160 on one side of the two support mechanisms 150 and 160 (or the support mechanism 150 may be provided) is provided in parallel with the flat plate-like fixed piece 151 and the fixed piece 151. Flat plate-like movable piece 152, a pair of clamp pieces 153 and 154 attached to the movable piece 152 and sandwiching the outer peripheral surface of the stator 10, and a leaf spring 155 connecting the fixed piece 151 and the movable piece 152. And have.

  The fixed piece 151 has an opening 157 into which the stator 10 can be loosely inserted at the center. The fixed piece 51 is attached to the fixed base 30 side through a bolt hole 158 using a bolt (not shown). The movable piece 152 has an opening 159 into which the stator 10 can be loosely inserted at the center. The leaf spring 155 is configured by using, for example, a stainless spring rope having corrosion resistance, and has an opening 160 into which the stator 10 can be loosely inserted at the center.

  The fixing piece 151 and the leaf spring 155 are connected by inserting the bolts 163a and 163c into the through holes 161a and 161c and screwing them into the corresponding screw holes 164a and 164c provided in the fixing piece 151. Similarly, the movable piece 152 and the leaf spring 155 are connected by inserting bolts 163b and 163d into the through holes 161b and 161d and screwing them into corresponding screw holes 164b and 164d provided in the movable piece 152.

  The lower clamp piece 153 is attached to the movable piece 152 by screwing the bolts 172a and 172b with the corresponding screw holes 173a and 173b provided in the movable piece 152. The stator 10 is fixed by the clamp pieces 153 and 154 with the bolts 183a and 183b in a state in which the stator 10 is fitted in grooves 181a and 181b having substantially arc shapes provided in the clamp pieces 153 and 154, respectively. Is screwed into corresponding screw holes 184a (not shown) and 184b provided in the clamp piece 153.

  In the support mechanism 160 configured as described above, when the stator 10 extends in the axial direction due to thermal expansion when the mover 20 generates heat, the movable piece 152 is moved together with the clamp pieces 153 and 154 as shown in FIG. Move in the direction of extension (see arrow). At this time, the leaf spring 155 is restricted from moving in the extending direction of the stator 10 by the bolts 163a and 63c, and is restricted from moving in the direction opposite to the extending direction by the bolts 163b and 63d. It bends and deforms in the axial direction of the stator 10 against the elastic force. When the temperature of the stator 10 decreases and the thermal expansion stops, the state of FIG. 7A is restored again by the elastic force of the leaf spring 155.

  As described above, the leaf spring 155 is provided so as to be bent substantially only in the axial direction of the stator 10, thereby appropriately supporting the stator 10 while preventing the axial center of the stator 10 from being displaced due to thermal expansion. be able to. At this time, the allowable amount of elongation of the stator 10 due to thermal expansion can be changed as appropriate by changing the shape of the leaf spring 155.

  The fixed piece 151 and the movable piece 152 are provided with holes 191a, 191b, 191c, and 191d into which the heads of the bolts 163a to 163d are movably inserted in the assembled state. Since the heads of the bolts 163a to 163d are slidably inserted into the holes 191a to 191d, the axial center shift (that is, the radial shift) of the stator 10 can be prevented more reliably and the stator can be prevented. 10 can be appropriately supported.

JP 2005-160213 A International Publication WO2008 / 013053 JP 2008-271623 A

  However, when the thermal expansion of the stator 10 is absorbed by the deformation of the leaf spring 155 as in the conventional support mechanism 160 of the linear slider 100, the stator 10 acts as a reaction of the thrust of the mover 20 during the operation of the linear motor. Thus, the original function of the support mechanisms 150 and 160 for supporting the thrust force cannot be sufficiently achieved.

  Therefore, from the above viewpoint, it is possible to absorb the elongation due to the thermal expansion of the stator and support the end of the stator firmly against the fixed base against the thrust generated by the mover, compared to the conventional structure. Mechanism configuration is required.

  An object of the present invention is to provide a linear slider having a support mechanism that can absorb elongation due to thermal expansion of the stator and can firmly support the end of the stator against the fixed base against thrust generated by the mover. Is to provide.

  In order to achieve the above object, the present invention provides a stator comprising a magnetic field in which a plurality of columnar permanent magnets are arranged in the same direction in the axial direction in a hollow cylindrical pipe; A plurality of ring-shaped armature coils arranged on the axis line and arranged parallel to each other via a magnet array and a magnetic gap, and a mover made of an armature having a yoke around it, A linear slider that travels the armature in the axial direction with respect to a magnetic field, and a support base for fixing the stator and two support mechanisms for supporting both ends in the longitudinal direction of the stator. And at least one of the two support mechanisms has a first support portion fixed to a longitudinal end portion of the stator and a second support portion fixed to the fixed base, The first support part and the second support part One has a convex portion, and the other of the first support portion and the second support portion has a concave portion that engages the convex portion so as to be movable in the axial direction, and a deepest portion of the concave portion. An abutting portion provided; and an elastic member housed in the concave portion so as to be interposed between the abutting portion and the convex portion.

  In the present invention, two support mechanisms respectively support the longitudinal ends of the stator. At least one of the two support mechanisms includes a first support portion fixed to the end portion of the stator and a second support portion fixed to the fixed base. Of the first and second support parts, a convex part provided on one side and a concave part provided on the other side are engaged. In this engagement, the convex portion and the concave portion are movable in the axial direction. Thereby, even when the stator thermally expands in the axial direction due to energization of the armature, and the positions of the stator and the first support portion change in the extension direction of the stator, the first support portion and the second support portion Relative displacement can be tolerated.

  At this time, the abutting portion is provided at the innermost portion of the concave portion, and an elastic member is interposed between the abutting portion and the convex portion. Thereby, in the state which made the convex part engage with the recessed part, the urging | biasing force to the pushback direction from the elastic member arrange | positioned in the recessed part is always added to the convex part. As a result, while the convex portion can be moved in the concave portion as described above, the urging force applied by the elastic member is appropriately set, so that the urging force causes the first support from the stator when the armature travels. The thrust applied to the part can be opposed and received. As a result, it is possible to reliably fulfill the original function of the support mechanism that firmly supports the end of the stator against the fixed base against the thrust.

  Preferably, the first support portion includes the convex portion, and the second support portion includes the concave portion, the abutting portion, and the elastic member.

  As a result, when the stator thermally expands in the axial direction, the convex portion of the first support portion fixed to the stator slides relative to the concave portion of the second support portion fixed to the fixed base, so that the relative Allow displacement. When the armature travels, the thrust applied to the convex portion of the first support portion from the stator can be received using the biasing force of the spring member provided in the concave portion of the second support portion.

  Preferably, the elastic member is disposed in the concave portion in a state where a predetermined preload is applied in advance.

  Accordingly, it is possible to reliably receive the thrust applied to the first support portion from the stator during traveling of the armature by reliably using the biasing force that the spring member to which the preload is applied returns.

  Preferably, the predetermined preload is larger than a thrust applied to the first support portion when the armature travels with respect to the field, and smaller than an expansion force due to thermal expansion of the stator accompanying energization of the armature. It is set to be.

  By setting the preload larger than the thrust and smaller than the expansion force, the convex portion is moved in the concave portion during thermal expansion of the stator to ensure relative displacement, and when the thrust is generated during travel of the armature, the convex portion is It is impossible to move in the recess and relative displacement is reliably prohibited, and thrust can be firmly received.

  Preferably, the convex portion is a protrusion having a substantially T-shaped cross section, and the concave portion is a groove having a substantially T-shaped cross section.

  Thereby, the uneven | corrugated fitting shape which can move only to an axial direction mutually can be implement | achieved easily and reliably.

  Preferably, the convex portion has a shape of relief, and the concave portion has a groove shape.

  Thereby, the uneven | corrugated fitting shape which can move only to an axial direction mutually can be implement | achieved easily and reliably.

  According to the present invention, elongation due to thermal expansion of the stator can be absorbed, and the end of the stator can be firmly supported with respect to the fixed base against thrust generated by the mover.

It is a perspective view showing the structure of the linear slider by one Embodiment of this invention. It is a longitudinal cross-sectional view showing the detailed structure of a stator and a needle | mover. It is an expansion perspective view showing the detailed structure of a support mechanism. It is a principal part disassembled perspective view of a support mechanism. It is a perspective view showing an example of the structure of the conventional linear slider. It is a disassembled perspective view showing the structure of the support mechanism of the conventional linear slider. It is a longitudinal cross-sectional view showing the structure of the support mechanism of the conventional linear slider.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the part equivalent to the prior art demonstrated in the said FIGS. 5-7, and description is abbreviate | omitted or simplified suitably.

  FIG. 1 is a perspective view showing the structure of the linear slider according to the present embodiment, and corresponds to FIG. In FIG. 1, the linear slider 1 of the present embodiment includes a stator 10 and a mover 20.

  FIG. 2 is a longitudinal sectional view showing the detailed structure of the stator 10 and the mover 20.

  In FIG. 2, a stator 10 includes a cylindrical permanent magnet 13 serving as a magnetic loading means, with a cylindrical ball piece 14 sandwiched between inner diameter sides of a non-magnetic hollow cylindrical pipe 11 extending in the axial direction. Are arranged in the axial direction with the same polarity and are bonded together to form the field 12. The purpose of providing the pole piece 14 between the permanent magnets 13 that are inserted in the axial direction with the same polarity is that the pipe 11 is made stronger by using the attractive force acting between the permanent magnet 13 and the pole piece 14. This is for fixing the permanent magnet 13 inside. Further, end blocks 15 are provided at both ends of the pipe 11 in the axial direction so as to suppress a repulsive force generated between the permanent magnets 13.

  Further, the mover 20 includes an armature 25 in which a plurality of ring-shaped armature coils 24 are arranged on the axis. The armature coil 24 is disposed in parallel with the magnet array of the permanent magnets 13 of the field 12 via a magnetic gap. The armature 25 also includes a cylindrical yoke 26 made of a magnetic material and a casing 27 around the armature coil 24. A plurality of armature coils 24 are arranged in the axial direction and provided inside the yoke 26. The casing 27 is attached to the outside of the yoke 26.

  Returning to FIG. 1, in the linear slider 1 of the present embodiment, instead of the support mechanisms 150 and 160, support mechanisms 50 and 60 are newly provided.

  FIG. 3 is an enlarged perspective view showing the detailed structure of the support mechanism 60, and FIG. 4 is an exploded perspective view of the main part of the support mechanism 60.

  3, 4, and FIG. 1, the support mechanism 60 includes a first support portion 70 that fixes the longitudinal end portion of the stator 10, and a second support portion 80 that is fixed to the fixed base 30. is doing.

  The first support part 70 includes an upper support part 71 and a lower support part 72 that are fixed to each other by bolts 74 while sandwiching the stator 10 from above and below. Specifically, four bolts 74 that are passed through through holes (not shown) provided in the upper support portion 71 are respectively inserted into screw holes 72a (see FIG. 4) provided in four corresponding positions of the lower support portion 72. By screwing, the upper support portion 71 and the lower support portion 72 are coupled to each other with the stator 10 interposed therebetween. A convex portion 73 is provided at the lowermost portion of the lower support portion 72. As shown in FIG. 3 and FIG. 4, the convex portion 73 has a protruding shape having a substantially inverted T-shaped cross section. In addition, the length L1 along the said axial direction of the convex part 73 is shorter than the length L0 along the said axial direction of the whole lower support part 72 (refer FIG. 4).

  The second support portion 80 has screw holes (not shown) in which bolts 82 (see FIGS. 3 and 1) respectively penetrated through four through holes 81 (see FIG. 4) are provided at four corresponding positions of the fixed base 30. To be fixed to the fixed base 30. The second support portion 80 includes a concave portion 83 that engages the convex portion 73 so as to be movable in the axial direction, and an abutting portion 84 provided at the innermost portion of the concave portion 83. As shown in FIG. 4, the recess 83 has a shape that can be fitted to the protrusion 73, that is, a groove having a substantially inverted T-shaped cross section. Further, the length L2 along the axial direction of the concave portion 83 is substantially equal to the length L1 along the axial direction of the convex portion 73, and the length along the axial direction of the entire second support portion 80. The length is shorter than L3. Due to the relationship of L2 <L3, the thickness of the abutting portion 84 is reliably ensured.

  As the elastic member, the concave portion 83 is interposed between the abutting portion 84 and the end surface 73A on the back side of the convex portion 73 when the convex portion 73 is inserted (see the arrow in FIG. 4). The spring 90 is housed and arranged. At this time, the spring 90 is compressed between the abutting portion 84 and the end surface 73A of the convex portion 73, so that a predetermined preload is applied in advance. In applying this preload, two forces applied to the stator 10 are considered. That is, one is an expansion force generated by thermal expansion of the stator 10 accompanying energization to the armature 25 during operation of the linear motor. The other is a thrust applied to the stator 10 as a reaction of the thrust generated by the mover 20 during the operation of the linear motor. In the present embodiment, the pre-pressure of the spring 90 is larger than the thrust applied from the stator 10 to the first support part 70, and from the stator 10 to the first support part 70 due to thermal expansion of the stator 10. The dimensions and spring constants of each part are appropriately determined so as to be smaller than the applied expansion force.

  Although the detailed structure has been described above by taking the support mechanism 60 as an example, the support mechanism 50 has the same configuration.

  As described above, in the linear slider 1 of the present embodiment, the support mechanisms 50 and 60 that respectively support both ends in the longitudinal direction of the stator 10 include the first support portion 70 and the second support portion 80. ing. And the convex part 73 with which the 1st support part 70 was equipped, and the recessed part 83 with which the 2nd support part was equipped engage mutually so that a movement in an axial direction is possible. Thereby, even when the stator 10 is thermally expanded in the axial direction by energization of the armature 25 during operation of the linear motor, and the positions of the stator 10 and the first support portion 70 are changed in the extending direction of the stator 10. The relative displacement between the first support part 70 and the second support part 80 can be allowed.

  At this time, the spring 90 is interposed between the abutting portion 84 provided at the innermost portion of the concave portion 83 and the end surface 73A of the convex portion 73, so that the convex portion 73 is in the engaged state between the concave portion 83 and the convex portion 73. A biasing force in the pushing-back direction from the spring 90 is always applied to the portion 73. As a result, by appropriately setting the urging force applied by the spring 90, the urging force counteracts the thrust applied to the first support portion 70 from the stator 10 when the armature 25 travels during linear motor operation. The thrust can be received. As a result, as described above, the convex portion 73 can be moved in the concave portion 83 and thermal expansion is allowed, but the end portion of the stator 10 is firmly supported against the fixed base 30 against the thrust. The original function of the support mechanism can be reliably performed.

  In the present embodiment, in particular, the spring 90 is disposed in the recess 83 in a state in which a predetermined preload has been applied in advance, so that the biasing force that the spring 90 to which the preload has been applied tries to return is reliably used. The thrust applied to the first support portion 70 during the operation of the linear motor can be reliably received. At this time, particularly in this embodiment, the preload is set to be larger than the thrust applied to the first support portion 70 and smaller than the expansion force due to the thermal expansion of the stator 10 due to energization of the armature. Is set. By setting the preload to be larger than the thrust and smaller than the expansion force, the protrusions 73 are moved in the recesses 83 with respect to the thermal expansion of the stator 10, and the relative displacement is surely allowed. The convex portion 73 cannot be moved in the concave portion 83, so that relative displacement can be reliably prohibited and the thrust can be firmly received.

  In the present embodiment, in particular, by forming the convex portion 73 and the concave portion 83 into a T-shaped cross-sectional shape, it is possible to easily and reliably realize the concave-convex fitting shape that can move only in the axial direction. it can. In addition, it is not restricted to such a T-shape, For example, it is good also as a dovetail groove shape which makes the convex part 73 into a known appreciated shape, and the recessed part 83 fits to this. In this case, the same effect is obtained.

  In the above, the first support part 70 is provided with the convex part 73 and the second support part 80 is provided with the concave part 83, and the convex part 73 and the concave part 83 are engaged with each other to be movable in the axial direction. However, it is not limited to this. That is, contrary to the above, a concave portion is provided in the first support portion 70 for fixing the stator 10, a convex portion is provided in the second support portion 80 fixed to the fixed base 30, and the convex portion and the concave portion are engaged. In combination, they may be movable in the axial direction. In this case, if a similar abutting portion is provided at the innermost part of the concave portion provided in the first support portion 70 and a spring 90 is interposed between the abutting portion and the convex portion provided in the second support portion 80. Good. In this case, the same effect as described above can be obtained.

  In the above description, both the two support mechanisms 50 and 60 have a structure in which the stator 10 is elastically supported using the spring 90 in the recess, but the present invention is not limited thereto. That is, only one of the two support mechanisms 50 and 60 may be the above-described elastic support structure using the spring 90 in the recess, and the other may be a support for the stationary stator 10 as usual. . That is, it is sufficient if at least one of the support mechanisms is the elastic support structure.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1 Linear slider 10 Stator 11 Pipe 12 Field 13 Permanent magnet 20 Movable element 24 Armature coil 25 Armature 26 Yoke 30 Fixed base 50 Support mechanism 60 Support mechanism 70 First support part 73 Projection part 80 Second support part 83 Concave part 84 Butting part 90 Spring (elastic member)

Claims (6)

A stator composed of a field magnet in which a plurality of cylindrical permanent magnets are arranged in the same direction in the axial direction in a hollow cylindrical pipe,
A movable element made of an armature that is arranged in parallel with a magnet array of the permanent magnets via a magnetic air gap and has a plurality of ring-shaped armature coils on the axis, and has a yoke around it. With
A linear slider that travels the armature in the axial direction with respect to the field,
A fixing base for fixing the stator;
Two support mechanisms for supporting both ends in the longitudinal direction of the stator,
At least one of the two support mechanisms is
A first support fixed to the longitudinal end of the stator;
A second support portion fixed to the fixed base,
One of the first support part and the second support part includes a convex part,
The other of the first support part and the second support part is
A concave portion that engages the convex portion movably in the axial direction;
The abutting part provided at the innermost part of the recess,
A linear slider comprising: an elastic member housed and disposed in the concave portion so as to be interposed between the abutting portion and the convex portion. The first support part includes the convex part,
The linear slider according to claim 1, wherein the second support portion includes the concave portion, the abutting portion, and the elastic member. The elastic member is
3. The linear slider according to claim 1, wherein the linear slider is disposed in the concave portion in a state in which a predetermined preload is applied in advance. The predetermined preload is
Greater than the thrust applied to the first support when the armature travels against the field,
To be smaller than the expansion force due to thermal expansion of the stator accompanying energization to the armature,
The linear slider according to claim 1, wherein the linear slider is set. The protrusion is a protrusion having a substantially T-shaped cross section,
The linear slider according to claim 1, wherein the recess is a groove having a substantially T-shaped cross section. The convex portion has a thankful shape,
The linear slider according to claim 1, wherein the recess has a dovetail shape.

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