ELECTRIC MOTOR AND SEAL

Abstract

This electric motor comprises: a first member having a recessed surface in which a recess is formed; a seal having a bead and arranged such that the bead is in contact with a portion of the recessed surface other than the recess itself; and a second member enclosing the seal together with a first member.

Description

[TECHNICAL FIELD]The present invention relates to an electric motor and a seal.[BACKGROUND OF THE ART]Electric motors can be operated under severe conditions. For example, an electric motor may be used in a machine tool in an environment where it is exposed to splashing of cutting fluid. The cutting fluid sprays may enter the electric motor and cause a malfunction. Therefore, gaskets are provided between members constituting the electric motor (see, for example, Patent Document 1).[PRIOR ART][PATENT DOCUMENT][Patent Document 1] Japanese Patent Application Laid-Open No. 2015-25513[SUMMARY OF THE INVENTION][PROBLEMS SOLVED BY THE INVENTION]However, if there is a depression between the surfaces of the elements enclosing the gasket, a gap may be formed between the elements. In this case, a foreign matter such as cutting fluid may enter the electric motor and cause a malfunction in the electric motor. Therefore, there is a need for an electric motor and a gasket that can prevent a foreign object from entering the electric motor even when a recess is provided between the surfaces enclosing the gasket.[MEANS FOR SOLVING THE PROBLEM]An electric motor according to the present disclosure includes: a first member having a recessed surface in which a recess is formed; a gasket having a bead, the bead being disposed such that the bead is in contact with a part of the recessed surface other than the recess itself; and a second member enclosing the gasket together with the first member.A gasket according to the present disclosure includes a bead and is disposed between a first member having a recessed surface in which a recess is formed and a second member in which the beads are in contact with a part of the recessed surface other than the recess itself.[BRIEF DESCRIPTION OF THE DRAWINGS]FIG. 1 is a front view of an example of an electric motor; FIG. 2 is a plan view of an example of a gasket; FIG. 3 is an enlarged view showing a part of FIG. 2 ; FIG. 4 is an aligned sectional view IV-IV of FIG. 3 ; FIG. 5 illustrates an example of arrangement of a depression and beads; FIG. 6 shows a comparative example; FIG. 7 illustrates another example of the arrangement of the depression and the beads; FIG. 8 shows a comparative example; FIG. 9 illustrates an electric motor of a second embodiment; FIG. 10 shows a comparative example; FIG. 11 shows another example of the seal; FIG. 12 shows still another example of the seal; and FIG. 13 shows an example of fixing a first member and a fourth member.[EMBODIMENT OF THE INVENTION]A description will now be made of an electric motor and a gasket according to some embodiments of the present disclosure with reference to the accompanying drawings. The following description assigns the same reference numerals to constituent elements having the same or similar functions. Such elements will not be described repeatedly.< Embodiment>FIG. 1 is a front view of an example of an electric motor. An electric motor 1 is applied to a machine tool, for example. The electric motor 1 includes an assist motor, a spindle motor, and so on.The electric motor 1 includes a rotator 2 and a stator 3. The rotator 2 is a member rotated by magnetic force applied from the stator 3.The stator 3 is a member that generates magnetic force for rotating the rotator 2. The stator 3 includes a first member 31, a second member 32, a gasket 4, a third member 33, and a fourth member 34.The first member 31 is, for example, one of members constituting a housing of the electric motor 1. The first member 31 has a surface 31 athat is in contact with the gasket 4 and a surface 31 bthat is in contact with the third member 33. The surface 31a in contact with the gasket 4 and the surface 31b in contact with the third member 33 are flat.A through hole 31c is formed between the surface 31b in contact with the third member 33 and the surface 31a in contact with the gasket 4. The through hole 31 cis a hole into which a first fastening member 5 ais inserted. The through hole 31 cis formed at a location slightly spaced from the first member 31 side, for example. The through hole 31c has a counterbore and a through hole.The counterbore serves to receive the head of the first fastener 5a. The through hole is for inserting the threaded part of the first fastening member 5 a. The through hole extends from the bottom of the counterbore to the surface 31a which is in contact with the seal 4. That is, the through hole extends between the bottom of the counterbore and the surface 31a which is in contact with the gasket 4.The surface 31 bcontacting the third member 33 is provided with a blind hole 31 dinto which a second fastening member 5 bis inserted; the second fastening member 5 bwill be described later. The blind hole 31 dis formed between the side of the first member 31 and the through hole 31 cin which the first fastening member 5 ais inserted. The blind hole 31 dis, for example, a threaded hole. The threaded bore is formed by tapping.The first member 31 is formed by die casting, for example. The first member 31 is, for example, a die casting made of aluminum.The second member 32 is, for example, a core of the stator 3.The second member 32 has a surface 32a in contact with the gasket 4 and a surface 32b in contact with the fourth member 34. The surface 32a that is in contact with the gasket 4 and the surface 32b that is in contact with the fourth member 34 are flat.A through hole 32c is formed between the surface 32a in contact with the gasket 4 and the surface 32b in contact with the fourth member 34. The through hole 32 cis a hole into which a first fastening member 5 ais inserted. For example, the through hole 32 cis a through hole. In a case where the second member 32 is made of the magnetic steel sheets, the through hole 32 cis formed by punching the steel sheets before being stacked.The gasket 4 is a member configured to improve airtightness and liquid tightness between the first member 31 and the second member 32. Specifically, the seal 4 is configured to prevent a foreign object such as a cutting fluid from entering the electric motor 1 between the first member 31 and the second member 32. The gasket 4 is, for example, a metal member. At least one of the surfaces of the gasket 4 may be coated with rubber. That is, the gasket 4 may be formed by enclosing a metal layer with rubber layers. Alternatively, the seal 4 may be a rubber member.FIG. 2 is a plan view showing an example of the gasket 4. The gasket 4 has an outer shape corresponding to that of the first member 31 and the second member 32. The seal 4 is formed in a ring shape. In other words, a through hole 4a is formed at the center of the gasket 4.In addition, the gasket 4 is provided with a plurality of small-diameter through holes 4b. Each small-diameter through hole 4 bis configured to pass the first fixing member 5 athrough or to pass a set pin therethrough for attaching the first member 31 and the second member 32 to each other.FIG. 3 is an enlarged view showing a part of FIG. 2. The seal 4 has a bead 4c. The bead 4 cis a recess formed in the gasket 4. Specifically, the bead 4 cis configured to apply the maximum pressure to the first member 31 and the second member 32 when the gasket 4 is sandwiched between the first member 31 and the second member 32. The bead 4 cis formed in the ring shape along the outer shape of the gasket 4.FIG. 4 is a sectional view IV-IV of FIG. 3 in which the cross section of the gasket 4 has a shape in which a plate-shaped member is bent at one or more locations. According to the example shown in FIG. 4, the gasket 4 has a shape in which the plate-shaped member is bent at two locations. The bead 4 cis formed by, for example, punching. In addition, the both surfaces of the gasket 4 are coated with rubber 4d. That is, the gasket 4 has rubber layers on both surfaces. Alternatively, only one of the surfaces of the gasket 4 may be coated with rubber 4d. The description now refers again to FIG. 1.The third member 33 is, for example, one of constituent elements of the housing of the electric motor 1. the third member 33 has a surface 33 athat is in contact with the first member 31. The third member 33 also has a surface 33 blocated on the opposite side of the surface 33 athat is in contact with the first member 31. The surface 33a in contact with the first member 31 is flat. Further, the surface 33 blocated on the opposite side of the surface 33 athat is in contact with the first member 31 is flat.A through hole 33 cis formed between the surface 33 athat is in contact with the first member 31 and the surface 33 bthat is on the opposite side of the surface 33 athat is in contact with the first member 31. The second fastening element 5 bis inserted into the through hole 33 c. The through hole 33 cis formed near a side surface of the third member 33. That is, the second fixing member 5 bis disposed near the third member 33 side. The third member 33 is fixed to the first member 31 by the second fixing member 5 b.The through hole 33c has a counterbore and a through hole. The counterbore serves to receive the head of the second fastening element 5b. The through hole is for inserting the threaded part of the second fastening member 5 b. The through hole extends from the bottom of the counterbore to the surface 33a which is in contact with the first member 31. That is, the through hole extends between the bottom of the counterbore and the surface 33a which is in contact with the first member 31.The third member 33 is made of, for example, a non-iron casting. The material forming the third member 33 has a larger elongated elastic modulus than the material forming the first member 31. In other words, the elongated elastic modulus of the material constituting the first member 31 is smaller than that of the material constituting the third member 33. The third member 33 may have a higher rigidity than that of the first member 31. The elongated elastic module is also called Young's module.The fourth member 34 is, for example, one of constituent elements of the housing of the electric motor 1. the fourth member 34 has a surface 34 athat is in contact with the second member 32. The surface 34a in contact with the second member 32 is flat.The surface 34a in contact with the second element 32 is provided with a blind hole 34b into which a first fastening element 5a is inserted. The blind hole 34 bis, for example, a threaded hole.The fourth member 34 is formed by die casting, for example. The fourth member 34 is, for example, a die casting made of aluminum.FIG. 5 illustrates an example of the arrangement of the depression and the beads 4c. The gasket 4 shown in FIG. 5 is the gasket 4 in the oriented sectional view IV-IV in FIG. 3. in particular, FIG. 5 shows the outside of the electric motor 1 on its right side and the inside of the electric motor 1 on its left side. FIGS. 6 to 11 described later also show the outside of the electric motor 1 on the right side and the inside of the electric motor 1 on the left side.The first fixing member 5a is inserted into the through hole 31c in the first member 31, passed through the through hole 4b in the gasket 4 and the through hole 32c in the second member 32, and inserted into the blind hole 34b. That is, the first member 31 and the fourth member 34 are fastened to each other with the first fastening member 5 a. In addition, the gasket 4 is disposed between the first member 31 and the second member 32. In particular, the second element 32 encloses the seal 4 together with the first element 31.When the first fixing member 5a is inserted into the blind hole 34b in the fourth member 34 and fixed, compressive stress is applied to the first member 31. In other words, the first member 31 is subjected to a pressing force from the support surface of the first fixing member 5 aand the second member 32.When the second fixing member 5 bis inserted into the through hole 33 cin the third member 33 and further inserted into the blind hole 31 din the first member 31 to be fixed therein, the compressive stress is applied to the third member 33. In other words, the third member 33 is subjected to a pressing force from the support surface of the second fixing member 5 band the first member 31.Further, when the second fastening member 5 bis inserted and fastened into the blind hole 31 din the first member 31, the first member 31 is pulled by the fastening member 5 b. According to the example shown in FIG. 5, when the second fastening member 5 bis inserted into the blind hole 31 din the first member 31 and fastened, the first member 31 is pulled upward by the fastening member 5 b. When the first member 31, particularly the peripheral part of the blind hole 31d, is pulled by the fixing member 5b, the first member 31 is distorted.Specifically, when the second fastening member 5 bdrugs the first member 31, specifically, the circumferential part of the blind hole 31 d, a recess 31 is formed on the surface 31 athat is in contact with the gasket 4. The surface 31 athat is in contact with the gasket 4 of the first member 31 will be referred to as a recessed surface hereinafter. The recess 311 is formed at the periphery of a part of the recessed surface 31 athat intersects with the central axis of the second fastening member 5 b.In a case where the blind hole 31 dinto which the second fastening member 5 bis inserted is formed at a location adjacent to the first member 31, the recess 311 is formed at a location adjacent to the recessed surface 31 aside.The beads 4 cof the gasket 4 are formed so as to be in contact with a part of the recessed surface 31 awhich is not the recess 311 itself. In other words, the gasket 4 is disposed such that the beads 4 care in contact with a part of the recessed surface 31 awhich is not the recess 311 itself.In the example shown in FIG. 5, one of two beads 4 formed on the gasket 4 is disposed so as to be in contact with a flat surface other than the part where the recess 311 is formed on the recessed surface 31 a. Further, the other bead 4 cof the two beads 4 cformed on the gasket 4 is disposed so as to be in contact with a flat surface of the second member 32.Consequently, the beads 4 care elastically deformed by the force exerted by the first member 31 and the second member 32. In other words, the gasket 4 applies elastic force to the first member 31 and the second member 32, thereby preventing the formation of a gap between the first member 31 and the second member 32. The gasket 4 may include a part that undergoes plastic deformation when the first fixing member 5 ais fixed so as to enclose the gasket 4 between the first member 31 and the second member 32.In the state where the first fastening member 5 aand the second fastening member 5 bare respectively fastened in the blind hole 34 bin the fourth member 34 and in the blind hole 31 din the first member 31, the parts of the gasket 4 other than the beads 4 cmay also be in contact with the first member 31 and the second member 32.FIG. 6 shows a comparative example of the electric motor 1 according to the first embodiment. As shown in the comparative example, when the bead 4 cis located at a position corresponding to the depression 311, a part of the bead 4 cpositions the depression 311 centrally. That is, the bead 4c does not contact the recessed surface 31a. This results in the formation of a gap between the first member 31 and the second member 32. Even if the gap is not formed, it is not possible to sufficiently ensure airtightness and liquid tightness between the first member 31 and the second member 32.In the above-described embodiment, since the second fixing member 5 bdrear the sides of the first member 31 and the third member 33 pulls the first member 31, the recess 311 is formed near the side of the first member 31. However, the recess 311 may be formed at a position closer to the center of the first member 31, not only near the sides.FIG. 7 illustrates another example of the arrangement of the depression 311 and the gasket 4. the first member 31 and the fourth member 34 are fastened to each other with the first fastening member 5 a.The through hole 31 cin which the first fixing member 5 ais inserted is formed at a position adjacent to the first member 31 side, for example. In addition, the blind hole 31 dinto which the second fastener 5 bis inserted is formed at a position farther from the side than the bore into which the first fastener 5 ais inserted. In other words, the through hole 31 cin which the first fastener 5 ais inserted is formed between the blind hole 31 din which the second fastener 5 bis inserted and the side.When the first fixing member 5a is inserted and fixed into the blind hole 34b in the fourth member 34, the compressive stress is applied to the first member 31. In other words, the first member 31 is subjected to a pressing force from the support surface of the first fixing member 5 aand the second member 32.When the second fastening member 5 bis inserted and fastened into the blind hole 31 din the first member 31, the first member 31 is pulled by the second fastening member 5 b. According to the example shown in FIG. 7, when the second fastening member 5 bis fastened into the blind hole 31 din the first member 31, the first member 31 is pulled upward.When the second fastening member 5 bdrugs the first member 31, specifically, the circumferential part of the blind hole 31 d, the first member 31 is deformed. Specifically, when the second fastening member 5 bdrugs the first member 31, specifically, the periphery of the blind hole 31 d, the recess 311 is formed on the recessed surface 31 a. The recess 311 is formed on a part of the recessed surface 31 athat intersects with the central axis of the second fastening member 5 b.In a case where the blind hole 31 dinto which the second fastening member 5 bis inserted is formed at a location shortly spaced from the first member 31 side, the recess 311 is formed at a location shortly spaced from the recessed surface 31 aside.The beads 4 cof the gasket 4 are formed so as to be in contact with a part of the recessed surface 31 awhich is not the recess 311 itself. That is, the gasket 4 is disposed such that the beads 4 care in contact with a part of the recessed surface 31 awhich is not the recess 311 itself.In the example shown in FIG. 7, one of two beads 4 cformed on the gasket 4 is disposed so as to be in contact with a flat surface of the recessed surface 31 awhich is not the part where the recess 311 is formed. Further, the other of the two beads 4 cformed on the gasket 4 is disposed so as to be in contact with a flat surface of the second member 32.Consequently, the beads 4 care elastically deformed by the force exerted by the first member 31 and the second member 32. In other words, the gasket 4 applies elastic force to the first member 31 and the second member 32, thereby preventing the formation of a gap between the first member 31 and the second member 32.FIG. 8 shows a comparative example. As shown in the comparative example, when the bead 4 cis formed at a position corresponding to the depression 311, a part of the bead 4 cpositions the depression 311 centrally. That is, the bead 4c does not contact the recessed surface 31a. This results in the formation of a gap between the first member 31 and the second member 32. Even if the gap is not formed, it is not possible to sufficiently ensure airtightness and liquid tightness between the first member 31 and the second member 32.< Embodiment>FIG. 9 illustrates an electric motor 1 according to a second embodiment. The electric motor 1 of the second embodiment is different from the electric motor 1 of the first embodiment in whether the recess 311 is formed by deformation. In the electric motor 1 according to the second embodiment, the recess 311 formed on the recessed surface 31 aof the first member 31 is not formed by the drawing of the fastening member. The deformation of the recess 311 is generated by, for example, a machining error.The beads 4 cof the gasket 4 are formed so as to be in contact with a part of the recessed surface 31 awhich is not the recess 311 itself. That is, the gasket 4 is disposed such that the beads 4 care in contact with a part of the recessed surface 31 awhich is not the recess 311 itself.In the example shown in FIG. 9, one of two beads 4 cformed on the gasket 4 is disposed so as to be in contact with a flat surface of the recessed surface 31 awhich is not the part where the recess 311 is formed. Further, the other of the two beads 4 cformed on the gasket 4 is disposed so as to be in contact with a flat surface of the second member 32.Consequently, the beads 4 care elastically deformed by the force exerted by the first member 31 and the second member 32. In other words, the gasket 4 applies elastic force to the first member 31 and the second member 32, thereby preventing the formation of a gap between the first member 31 and the second member 32.FIG. 10 shows a comparative example of the electric motor 1 according to the second embodiment. As shown in the comparative example, when the bead 4 cis formed at a position corresponding to the depression 311, a part of the bead 4 cpositions the depression 311 centrally. That is, the bead 4c does not contact the recessed surface 31a. This results in the formation of a gap between the first member 31 and the second member 32. Even if the gap is not formed, it is not possible to sufficiently ensure airtightness and liquid tightness between the first member 31 and the second member 32.The cross section of the gasket 4 in the above-described embodiment has a shape in which a plate-shaped member is bent at one or more locations. However, the cross-sectional shape of the gasket 4 is not limited thereto.FIG. 11 shows another example of the gasket 4. the gasket 4 has a cross section having a shape in which a straight line is connected to an arc. The beads 4c are formed in the shape of a bow.FIG. 12 shows still another example of the gasket 4. the gasket 4 has a cross section having a shape in which a straight line is connected to a U-shaped line. The beads 4 care formed in a U-shape.In the above-described embodiment, the first fixing member 5 a inserted from the through hole 31 cin the first member 31 is fixed in the blind hole 34 bformed in the fourth member 34. Thus, the first member 31 and the fourth member 34 are fixed with the gasket 4 and the second member 32 therebetween. However, the manner of fixing the first member 31 and the fourth member 34 is not limited thereto.For example, the first fastening member 5 a, a third fastening member, and a rod may be used to fasten the first member 31 and the fourth member 34.FIG. 13 shows an example of the manner of fixing the first member 31 and the fourth member 34. the first member 31 is provided with the through hole 31 cbetween the surface 31 bcontacting the third member 33 and the surface 31 acontacting the gasket 4. The through hole 31 cis a hole into which the first fastening member 5 aand a part of a rod 5 dare inserted; the rod 5 dis described later. The through hole 31 cincludes a counterbore, a rod insertion hole, and a through hole.The counterbore serves to receive the head of the first fastener 5a. The rod insertion hole is for inserting a part of the rod 5 d. The rod insertion hole is disposed opposite to the counterbore. The through hole is for inserting the threaded part of the first fastening member 5 a. The through hole extends from the bottom of the counterbore to the rod insertion hole. That is, the through hole extends between the bottom of the counterbore and the bottom of the rod insertion hole.The second member 32 is provided with the through hole 32c between the surface 32a which is in contact with the gasket 4 and the surface 32b which is in contact with the fourth member 34. The through hole 32 cis a hole into which the rod 5 dis inserted. The through hole 32 cis, for example, a through hole.The fourth member 34 has a surface 34c opposite to the surface 34a in contact with the second member 32 opposite to the surface 34a in contact with the second member 32. Between the surface 34a in contact with the second member 32 and the surface 34c opposite to the surface 34a in contact with the second member 32, a through hole 34d is formed. The through hole 34 dis a hole into which a third fixing member 5 cand a part of the rod 5 dare inserted. The through hole 34 dincludes a counterbore, a rod insertion hole, and a through hole.The counterbore serves to receive the head of the third fastener 5c. The rod insertion hole is for inserting a part of the rod 5 d. The rod insertion hole is disposed opposite to the counterbore. The through hole is for inserting the threaded part of the third fixing member 5c. The through hole extends from the bottom of the counterbore to the rod insertion hole. That is, the through hole extends between the bottom of the counterbore and the bottom of the rod insertion hole.Into the through hole 32 cof the second member 32, the rod 5 dthat is elongated is inserted. The rod 5b is provided with screw holes at both ends.The first fixing member 5a is inserted into the through hole 31c of the first member 31 and fixed in one of the screw holes of the rod 5d. In addition, the third fixing member 5 cis inserted into the through hole 34 dof the fourth member 34 and fixed into the other of the screw holes of the rod 5 d. Thus, the first member 31 and the fourth member 34 are fastened to each other with the first fastening member 5 a, the third fastening member 5 c, and the rod 5 d. Furthermore, the seal 4 is arranged between the first element 31 and the second element 32.In the above embodiment, the example of forming the blind hole 31 dbetween the side of the first member 31 and the through hole 31 cin which the first fastening member 5 ais inserted (FIG. 1 ) and the example of forming the through hole 31 cbetween the blind hole 31 din which the second fastening member 5 bis inserted and the side of the first member 31 (FIG. 7 ) have been described. However, the locations where the through hole 31 cand the blind hole 31 dare formed in the first member 31 are not limited thereto. For example, the through hole 31 cand the blind hole 31 dmay be disposed near another side of the first member 31. Alternatively, the through hole 31 cand the blind hole 31 dmay be disposed close to each other or apart from each other.As described above, the electric motor 1 includes: the gasket 4 including the first member 31 in which the recess 311 is formed in the recessed surface 31, in the gasket 4, the beads 4 care arranged to be in contact with a part of the recessed surface 31 awhich is not the recess 311 itself; and the second member 32 enclosing the gasket 4 together with the first member 31.Accordingly, the electric motor 1 can prevent a foreign object from entering the electric motor 1 even when the recess 311 is located on the surfaces enclosing the gasket 4. Consequently, the electric motor 1 can prevent occurrence of a malfunction, thereby improving the operation rate.The electric motor 1 further includes the third member 33 fixed to the first member 31 by a fixing member, and the recess 311 is formed by drawing the fixing member on the first member 31. Thus, it is possible to prevent the foreign matter from entering the electric motor 1 even when the fastener causes deformation.The material forming the first member 31 has a smaller elongated elastic modulus than the material forming the third member 33. That is, the first member 31 deforms more than the third member 33. Also in such a case, the electric motor 1 can prevent foreign matter from entering.In addition, at least one of the surfaces of the gasket 4 is coated with rubber 4d. Thus, the electric motor 1 can more reliably prevent foreign matter from entering.Furthermore, the seal 4 is made of metal. That is, the seal 4 has moderate elasticity and thus ensures that no foreign object can enter the electric motor 1. A gasket formed by enclosing a metal layer with rubber layers has both a water repellent property and a heat radiating property. In addition, the gasket formed by enclosing the metal layer with the rubber layers may be processed in a desired shape. Thus, in the case where the gasket 4 is formed by enclosing the metal layer with the rubber layers, a developer can shape the beads 4c.Moreover, the gasket 4 has the beads 4 cand is disposed between the first member 31 in which the recess 311 is formed in the recessed surface 31 aand the second member 32, and the beads 4 care in contact with a part of the recessed surface 31 awhich is not the recess 311 itself. Thus, the gasket 4 can prevent a foreign object from entering the electric motor 1 even if the recess 311 is formed on any surface of the members enclosing the gasket 4. Consequently, the electric motor 1 can prevent the occurrence of the malfunction, thereby improving the operation rate.The present disclosure has been described in detail, but is not limited to the above-described embodiments. Thus, various additions, substitutions, alterations, partial omissions, and so forth may be made to the embodiments without departing from the gist of the disclosure or the spirit of the disclosure as may be derived from the content and equivalents described in the claims. Furthermore, the embodiments may be implemented by combining them.Supplementary notes according to the embodiments of the present disclosure are listed below.Supplementary Note (1)An electric motor includes: a first member having a recessed surface in which a recess is formed; a seal having a bead, the bead being disposed such that the bead contacts a part of the recessed surface other than the recess itself; and a second member enclosing the seal together with the first member.Supplementary Note (2)The electric motor according to Supplementary Note (1) further includes a third member fixed to the first member by a fixing member, the recess being formed by drawing the fixing member on the first member.Supplementary Note (3)The electric motor according to the supplementary note (2), wherein the material constituting the first element has a smaller elongated elastic modulus than the material constituting the third element.Supplementary Note (4)The electric motor according to any one of the supplementary notes (1) to (3), wherein at least one of the surfaces of the gasket is coated with rubber.Supplementary Note (5)The electric motor according to any one of the supplementary notes (1) to (4), wherein the seal is made of metal.Supplementary Note (6)A gasket has a bead and is disposed between a first member having a recessed surface in which a recess is formed and a second member in which the beads are in contact with a part of the recessed surface other than the recess itself.[EXPLANATION OF REFERENCE NUMERALS]1 Electric motor 2 rotator 3 stator 31 first member 31 asurface in contact with the gasket (recessed surface) 31 bsurface in contact with the third member 31 cthrough hole 31 dto blind hole 311 recess 32 second member 32 asurface in contact with the gasket 32 bsurface in contact with the fourth member 32 cthrough hole 33 third member 33 asurface in contact with the first member 33 bsurface on the opposite side of the surface in contact with the first member 33 cthrough hole 34 fourth member 34 asurface in contact with the second member 34 bto blind hole 34 csurface on the opposite side of the surface, the second member is in contact with 34d through hole 4 seal 4a through hole 4b small diameter through hole 4c bead 4d rubber 5a first fixing member 5b second fixing member 5c third fixing member 5d rodReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2015-25513

[0003]

Claims

An electric motor, comprising: a first member having a recessed surface in which a recess is formed; a gasket including a bead disposed such that the bead is in contact with a part of the recessed surface other than the recess itself; and a second member enclosing the gasket together with the first member.The electric motor of claim 1, further comprising a third member fixed to the first member by a fixing member, wherein the recess is formed by drawing the fixing member on the first member.An electric motor according to claim 2, wherein the material of which the first element consists has a smaller elongate elastic modulus than the material forming the third element.The electric motor according to any one of claims 1 to 3, wherein at least one of the surfaces of the gasket is coated with rubber.The electric motor according to any one of claims 1 to 4, wherein the seal is made of metal.A gasket comprising a bead and disposed between a first member having a recessed surface in which a recess is formed and a second member, wherein the bead is in contact with a part of the recessed surface other than the recess itself.

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