Armature unit and linear motor

Abstract

The armature unit includes: an armature; and a gasket having at least one rubber layer and a metal layer that can be disposed between the machine table and the armature.

Description

Technical Field

[0001] The present disclosure relates to an armature unit and a linear motor. Background Art

[0002] Conventionally, there is known a linear motor for driving a mechanical table (for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2004-343873 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Linear motors that drive machine tables are used in a variety of environments. For example, when a linear motor is used in a machine tool, cutting fluid or chips may enter the armature, causing the armature to malfunction.

[0008] Therefore, there is a need for an armature unit that can prevent foreign matter from entering.

[0009] Solutions to Solve Problems

[0010] The armature unit includes: an armature; and a washer having at least a rubber layer and a metal layer that can be arranged between a machine table and the armature.

[0011] The armature washer includes at least two rubber layers and a metal layer sandwiched between the at least two rubber layers.

[0012] Effects of the Invention

[0013] According to one aspect of the present disclosure, it is possible to prevent foreign matter from entering the armature. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing an example of an armature unit.

[0015] Figure 2 This is a side view showing an example of a gasket having a rubber layer and a metal layer.

[0016] Figure 3 It is a cross-sectional view showing an example of an armature unit to which a machine table is fixed.

[0017] Figure 4 It is a cross-sectional view showing an example of an armature unit including a cooling plate.

[0018] Figure 5 It is a perspective view showing an example of an armature unit.

[0019] Figure 6 It is a cross-sectional view showing an example of an armature unit to which a machine table is fixed.

[0020] Figure 7 It is a cross-sectional view showing an example of an armature unit including a plate.

[0021] Figure 8 It is a perspective view showing an example of an armature unit.

[0022] Fig.9A It is a cross-sectional view showing an example of the armature unit.

[0023] Fig. 9B It is a cross-sectional view showing an example of the armature unit.

[0024] Fig.10 This is a diagram showing an example of a washer in which a concave-convex portion is formed so as to surround a plurality of bolt holes.

[0025] Fig.11 It is a cross-sectional view showing an example of a machine table and an armature unit.

[0026] Fig.12 This is a diagram showing another example of a washer in which a concave-convex portion is formed so as to surround a plurality of bolt holes.

[0027] Fig.13 This is a diagram showing another example of a washer in which a concave-convex portion is formed so as to surround a plurality of bolt holes. DETAILED DESCRIPTION

[0028] Hereinafter, the armature unit and the armature gasket of the embodiment of the present disclosure are described using the accompanying drawings. In addition, all combinations of the features described in the following embodiments are not necessarily necessary to solve the problem. In addition, detailed descriptions beyond the necessary are sometimes omitted. In addition, the descriptions of the following embodiments and the accompanying drawings are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the scope of the technical solution.

[0029] The armature unit is an armature unit for a linear motor. A linear motor drives a mechanical table, for example, a machine tool or a measuring device.

[0030] Figure 1 1 is a perspective view showing an example of an armature unit. The armature unit 1 includes an armature 2 and a washer 3 having at least one rubber layer that can be arranged between a machine table and the armature 2 .

[0031] The armature 2 is a component having a winding that generates an induced electromotive force by relative movement with a magnetic field. The armature 2 is, for example, a rectangular parallelepiped with rectangular faces, and has a winding inside. The armature 2 moves along a stator (not shown) that generates a magnetic field.

[0032] The machine table is a component for placing objects. When the machine table is used in a machine tool, a workpiece is placed on the machine table as an object. When the machine table is used in a measuring device, an object to be measured is placed on the machine table as an object. The machine table is formed in a rectangular parallelepiped shape, for example, with each surface consisting of rectangular surfaces.

[0033] The gasket 3 is a sealing material for providing airtightness and liquid-tightness to a structure, and is formed, for example, in a rectangular shape identical to the upper surface of the armature 2. The gasket 3 may include at least two rubber layers and a metal layer sandwiched between the at least two rubber layers.

[0034] The rubber layer is a layer of a polymer compound having elasticity. The polymer compound is, for example, an elastomer. The rubber layer is a thin sheet-shaped member.

[0035] The metal layer is made of a thin plate of metal, such as stainless steel.

[0036] Figure 2 1 is a side view showing an example of a gasket 3 having a rubber layer and a metal layer. The gasket 3 has two rubber layers 31 and a metal layer 32 sandwiched between the two rubber layers 31. The rubber layer 31 and the metal layer 32 are bonded to each other by, for example, an adhesive.

[0037] The thickness dg of the gasket 3 is greater than or equal to 0.1 [mm] and less than or equal to 5 [mm]. In addition, the thickness dr of one rubber layer 31 is greater than or equal to 0.01 [mm] and less than or equal to 0.1 [mm]. In addition, when the thickness dr of one rubber layer 31 is, for example, 0.1 [mm], the thickness dg of the gasket 3 is at least greater than 0.2 [mm], and of course, greater than the lower limit value of the thickness dg of the gasket 3, which is 0.1 [mm].

[0038] exist Figure 2 In the gasket 3 shown, the thickness dm of the metal layer 32 is 0.2 [mm], the thickness dr of one rubber layer 31 is 0.025 [mm], and the total thickness is 0.25 [mm].

[0039] Figure 3 2 is a cross-sectional view showing an example of an armature unit 1 to which a mechanical table is fixed. A gasket 3 is sandwiched between the armature 2 and the mechanical table T. Thus, foreign matter such as cutting fluid can be prevented from entering between the armature 2 and the gasket 3. That is, the armature 2 can be waterproofed by the metal contact of the metal layer 32 included in the gasket 3. In addition, the mechanical table T and the armature 2 can be fixed to each other by, for example, a known clamping member.

[0040] For example, even if a liquid sealing material is applied between the armature 2 and the mechanical table T, the armature 2 can be waterproofed. However, the liquid sealing material also has the performance of an adhesive, so it is difficult to remove the mechanical table T from the armature 2. In addition, the liquid sealing material is likely to be unevenly applied, and in this case, the armature 2 cannot be fully waterproofed. Therefore, for example, when a hole is formed on the surface of the armature 2, cutting fluid or the like may penetrate through the hole.

[0041] On the other hand, the armature unit 1 of the present disclosure includes: an armature 2; and a gasket 3 having at least one rubber layer 31 and a metal layer 32 that can be arranged between the mechanical table T and the armature 2. Therefore, the gasket 3 is not a sealing material, so the mechanical table T can be easily removed from the armature 2. That is, the armature unit 1 of the present disclosure is highly maintainable. In addition, there will be no problem of uneven coating during manufacturing.

[0042] Furthermore, the armature unit 1 of the present disclosure has a rubber layer 31, so it has high heat insulation. That is, it is possible to prevent the heat generated by the armature 2 from being transferred to the mechanical table T. Therefore, it is possible to prevent the mechanical table T from being deformed due to heat. As a result, when the mechanical table T is used for a machine tool, the processing accuracy of the workpiece can be improved. In addition, when the mechanical table T is used for a measuring device, the measurement accuracy of the object to be measured can be improved.

[0043] For example, by disposing a cooling plate C having a cooling pipe between the armature 2 and the machine table T, it is possible to prevent the heat generated by the armature 2 from being transferred to the machine table T (see Figure 4 ). However, the thickness of the cooling plate C is relatively thick, and the armature unit 1 is enlarged. Furthermore, a cooler is required to cool the cooling water, resulting in an increase in the size of the machine. In addition, the cooler consumes a large amount of energy. As a result, the emission of carbon dioxide increases.

[0044] On the other hand, the armature unit 1 has a thin washer 3, so the armature unit 1 can be miniaturized. The thickness dr of one rubber layer 31 is 0.01 mm to 0.1 mm. The thickness of the washer is 0.1 mm to 5 mm.

[0045] By setting the thickness dr of the rubber layer 31 and the thickness of the gasket to such thicknesses, it is possible to increase the rigidity of the connection between the armature 2 and the machine table T. As a result, the machine table T is less likely to vibrate, and the positioning accuracy of the machine table T is improved.

[0046] In addition, the armature unit 1 of the present disclosure does not use a cooler, so that energy consumption can be suppressed.

[0047] The greatest advantage of the armature unit 1 of the present disclosure is that it can simultaneously achieve the above-mentioned waterproofness, maintainability, simplification of manufacturing, heat insulation, miniaturization, and the effects of suppressing energy consumption.

[0048] In the above-described embodiment, holes are not formed in the washer 3. However, when the machine table T is fixed to the armature 2 by bolts, holes for bolts may be formed in the washer 3.

[0049] Figure 5 1 is a perspective view showing an example of an armature unit 1. A threaded hole 21 for a bolt is formed on the upper surface of the armature 2. The workbench is fixed to the armature 2 by the threaded hole 21. In addition, a plurality of bolt holes 33 for inserting bolts are formed on the washer 3 at positions corresponding to the threaded holes 21. The bolt holes 33 are formed by, for example, laser processing.

[0050] Figure 6 1 is a cross-sectional view showing an example of an armature unit 1 to which a mechanical table T is fixed. A washer 3 is sandwiched between the armature 2 and the mechanical table T. The bolt B is inserted into the hole of the table and the bolt hole 33 of the washer 3 and screwed into the threaded hole 21 of the armature 2. Thus, liquid can be prevented from entering between the mechanical table T and the armature 2. As a result, liquid can be prevented from entering the threaded hole 21 of the armature 2.

[0051] In order to prevent the liquid from entering the threaded hole 21 formed in the armature 2, for example, a plate P having an O-ring R may be arranged around the bolt B (see Figure 7 In this case, it is possible to prevent liquid from entering between the machine table T and the plate P and between the plate P and the armature 2. However, in this case, the armature unit 1 is enlarged by the thickness of the plate P. In addition, the plate P cannot prevent the heat generated by the armature 2 from being transferred to the machine table T.

[0052] On the other hand, since the thickness of the gasket 3 of the armature unit 1 is thin, the armature unit 1 can be miniaturized. In addition, since the gasket 3 has the rubber layer 31, it can exert a heat insulating effect.

[0053] The washer 3 in the above-described embodiment does not have the concavo-convex portions, but the washer 3 may have the concavo-convex portions at positions surrounding the bolt holes 33 .

[0054] Figure 8 : is a perspective view showing an example of the armature unit 1. The concavo-convex part 34 is formed around the bolt hole 33. The concavo-convex part 34 is formed by, for example, a press machine. That is, by the press working, the metal layer 32 of the washer 3 is plastically deformed to form the concavo-convex part 34.

[0055] The concavo-convex portion 34 is formed so as to surround one bolt hole 33. That is, a plurality of concavo-convex portions 34 are formed on the washer 3 so as to surround each bolt hole 33.

[0056] Fig.9A as well as Fig. 9B It is a cross-sectional view showing an example of the armature unit 1 to which the machining table T is fixed. Fig.9A Indicates the state before bolt B is tightened. In addition, Fig. 9B Indicates the state after bolt B is tightened.

[0057] The gasket 3 has a first surface and a second surface on the back side of the first surface. Fig.9A as well as Fig. 9B In the embodiment, the surface in contact with the machine table T is the first surface. In addition, the surface in contact with the armature 2 is the second surface. A convex portion 341 is formed on the first surface, and a concave portion 342 is formed at a position corresponding to the convex portion 341 on the second surface. In addition, as described above, the concave portion 342 and the convex portion 341 are formed in a manner to surround one bolt hole 33.

[0058] When the bolt B is screwed into the threaded hole 21 formed in the armature 2, the top portion of the protrusion 341 receives a pressing force from the lower surface of the mechanical table T. As a result, the pressure acting on the contact surface between the mechanical table T and the gasket 3 and the pressure acting between the armature 2 and the gasket 3 increase. The gasket 3 of the present disclosure is different from the conventional gasket and includes a metal layer 32 in addition to the rubber layer 31. Therefore, the metal contact bonding force based on the metal layer 32 increases, and as described above, the contact pressure can be further increased. As a result, it is possible to stably prevent liquid from penetrating between the mechanical table T and the armature 2.

[0059] In addition, a small space is formed between the recessed portion 342 of the gasket 3 and the upper surface of the armature 2. The space contains air. Therefore, an air layer is formed between the armature 2 and the gasket 3, and the heat insulation effect of the gasket 3 can be improved.

[0060] In the above-described embodiment, the concavo-convex portion 34 is formed so as to surround one bolt hole 33. However, the concavo-convex portion 34 may be formed so as to surround a plurality of bolt holes 33.

[0061] Fig.10 2 is a diagram showing an example of a gasket 3 in which a concave-convex portion 34 is formed so as to surround a plurality of bolt holes 33. Fig.10 In the washer 3 shown in FIG. 1 , the concavoconvex portion 34 is formed so as to surround all the bolt holes 33. In this case, the lower surface of the machine table T only needs to contact the concavoconvex portion 34 of the washer 3. That is, the area inside the portion in contact with the concavoconvex portion 34 does not necessarily need to contact the washer 3. Therefore, if Fig.11 As shown, the thickness of the region located inside the portion in contact with the concavo-convex portion 34 can be thinner than the thickness of the region in contact with the concavo-convex portion 34. Thus, the weight of the machine table T can be reduced.

[0062] Fig.12 as well as Fig.13 This is a diagram showing another example of the washer 3 in which the concavo-convex portion 34 is formed so as to surround the plurality of bolt holes 33 .

[0063] exist Fig.12 In the washer 3 shown in the figure, a concave-convex portion 34 is formed so as to surround a plurality of bolt holes 33 arranged in a direction perpendicular to the longitudinal direction of the washer 3. Fig.13 In the washer 3 shown, the concavoconvex portion 34 is formed so as to surround a plurality of bolt holes 33 arranged in the longitudinal direction of the washer 3. Thus, compared with forming the concavoconvex portion 34 around each bolt hole 33, the number of press processes for forming the concavoconvex portion 34 can be reduced.

[0064] In addition, the present disclosure is not limited to the above-mentioned embodiment, and can be appropriately changed within the scope not departing from the gist. For example, any component of the embodiment of the present disclosure can be modified, or any component of the embodiment can be omitted.

[0065] Explanation of symbols

[0066] 1—armature unit, 2—armature, 21—threaded hole, 3—washer, 31—rubber layer, 32—metal layer, 33—bolt hole, 34—concave and convex part, 341—convex part, 342—concave part, T—machine table, B—bolt, C—cooling plate, P—plate, R—O-ring.

Claims

1. An armature unit, characterized in that: have: armature; and A gasket having at least one rubber layer and a metal layer can be disposed between a machine table and the armature.

2. The armature unit according to claim 1, characterized in that The gasket has at least two rubber layers and a metal layer sandwiched by the at least two rubber layers.

3. The armature unit according to claim 1 or 2, characterized in that: The thickness of the at least one rubber layer is 0.01 [mm] or more and 0.1 [mm] or less.

4. The armature unit according to any one of claims 1 to 3, characterized in that: The gasket has a thickness of 0.1 [mm] or more and 5 [mm] or less.

5. The armature unit according to any one of claims 1 to 4, characterized in that: The washer has a bolt hole formed therein.

6. The armature unit according to claim 5, characterized in that The washer has a first surface and a second surface located on the back side of the first surface, a convex portion is formed on the first surface, a concave portion is formed at a position corresponding to the convex portion on the second surface, and the concave portion and the convex portion are formed to surround one or more of the bolt holes.

7. A linear motor, characterized in that: An armature unit comprising any one of claims 1 to 6.

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