Motor

Abstract

Engine (10), comprising: a cylindrical housing (14) accommodating a rotor (12); a first element (16) mounted on an opening (14a) of the housing (14); and a second element (18) sandwiching the first element (16) as mounted between the second element (18) and the housing (14), wherein the housing includes, at one end of the housing (14) facing the second element (18), a first locking part (14c) which locks a first locked part (18d) of the second element, and the second element (18) is elastically deformed by the first locking part (14c) and locked to the housing accordingly and is configured such that a gap (G) is formed between the first locked part (18d) and the housing (14) when the second element (18) is locked to the housing (14).

Description

[FIELD OF INVENTION]

[0001] The present invention relates to a structure for fixing elements. [STATE OF THE ART]

[0002] Structures in which a brush holder is attached to an opening of a cylindrical yoke forming a motor are known. A structure in which a brush holder is sandwiched between a yoke and a front bracket is also proposed (see JP 4 179 590 B2).

[0003] Document DE 103 32 810 A1 discloses a motor with a cylindrical yoke having an opening portion. A brush holder member is attached to the opening portion of the yoke and holds a pair of feed brushes. A housing member is attached to the opening portion of the yoke on the outside of the brush holder member and covers the opening portion. A pair of mounting pieces are integrally formed with the yoke.

[0004] The documents DE 10 2007 014 781 B3, DE 103 61 860 A1, DE 10 2008 001 594 A1, DE 20 37 993 A and US 2010 / 0 270 879 A1 also deal with engine structures and configurations. [PROBLEM TO BE SOLVED BY THE INVENTION]

[0005] The degree of expansion and contraction of elements due to variations in temperature and humidity varies depending on the material and shape of the elements. Therefore, if variations in temperature or moisture absorption are repeated while the elements are attached and fixed together, the state of attachment between the elements may gradually change, resulting in loose connections between the elements.

[0006] The present invention addresses this background, and one purpose thereof is to provide a technology capable of keeping the elements fixed to each other in a stable manner. [METHODS TO SOLVING THE PROBLEM]

[0007] The above-mentioned problem is solved by a respective motor having the features of the independent claims. The motor according to an embodiment of the present invention comprises: a cylindrical housing accommodating a rotor; a first member mounted at an opening of the housing; and a second member sandwiching the first member as mounted between the second member and the housing. The housing includes, at an end of the housing facing the second member, a first locking part that locks a first locked part of the second member. The second member is elastically deformed by the first locking part and locked to the housing accordingly, and configured such that a gap is formed between the first locked part of the second member and the housing when the second member is locked to the housing.

[0008] According to this embodiment, the second member is configured such that a gap is formed between the second member and the housing when the second member is locked to the housing. The gap allows the second member to deflect even when the dimension of the second member changes due to a change in temperature or humidity. Accordingly, the first deep-drawn part is prevented from being deformed due to the expansion of the second member. As a result, the second member is held in a state of being biased by the first deep-drawn part toward the housing and is accordingly fixed, and the second member and the first member are prevented from detaching.

[0009] The first locking part may be a first deep-drawn part produced by deforming a part of the housing.

[0010] The first element may include a first contact portion that comes into contact with an end surface of the housing when the first element is sandwiched between the second element and the housing. This allows the first element to be precisely positioned relative to the housing.

[0011] The second element may include a second locking part that presses the first contact part toward the end face. The housing may include a second locking part at an end of the housing facing the second element that locks the second locked part. The second locking part may be a second deep-drawn part produced by deforming a portion of the housing, so that the first contact part and the second locked part are preloaded toward the housing and fixed accordingly. This allows the first element and the second element to be positioned together.

[0012] The first member may include a main part in which an outer peripheral surface is formed along an inner peripheral surface of the housing, and a pressed part provided to face the second member and configured such that the outer peripheral surface is expanded when the pressed part is pressed. The second member may include a pressing part that presses the pressed part when the first member is sandwiched between the second member and the housing. Thereby, the outer peripheral surface of the first member can be expanded by the pressed part of the first member pressed by the pressing part of the second member when the first member is sandwiched between the second member and the housing, whereby the first member can be firmly attached to the inner peripheral surface of the housing.

[0013] The pressed part may include a first slope that becomes higher in an axial direction away from a center of the first member to an outer peripheral surface thereof. The pressed part may include a second slope that becomes lower in an axial direction away from a center of the second member to an outer peripheral surface thereof. This realizes a mechanism whereby the outer peripheral surface of the first member is expanded without requiring a complicated shape of the pressed part or the pressed part.

[0014] An angle of the first slope relative to a horizontal plane perpendicular to the axial direction of the housing is denoted by α°, and an angle of the second slope relative to the horizontal plane perpendicular to the axial direction of the housing is denoted by β°, where the angles are configured such that α<β is satisfied. This can expand the outer peripheral surface of the first member with a relatively small force.

[0015] The first member may further include a connector portion protruding from the main body in a radial direction, and a mating portion that joins the main body and the connector portion. The mating portion may include a second contact portion that comes into contact with the end surface of the housing when the mating portion is sandwiched between the second member and the housing. The second contact portion may be provided opposite the first contact portion across the center of the housing. This causes the first member to come into contact with two distal portions of the end surface of the housing, thus improving positioning precision and preventing the first member from being mounted at an angle.

[0016] Another embodiment of the present invention also relates to a motor. The motor comprises: a cylindrical housing that houses a rotor; a first member mounted at an opening of the housing; and a second member that sandwiches the first member as mounted between the second member and the housing. The first member includes a main part in which an outer peripheral surface is formed along an inner peripheral surface of the housing, and a pressed part that is provided to face the second member and is configured such that the outer peripheral surface is expanded when the pressed part is pressed. The second member includes a pressing part that presses the pressed part when the second member sandwiches the first member between the second member and the housing.

[0017] According to this embodiment, the outer peripheral surface of the first member is expanded by the pressed part of the first member pressed by the pressing part of the second member while the first member is sandwiched between the second member and the housing, whereby the first member can be firmly attached to the inner peripheral surface of the housing.

[0018] The first element may be a brush holder in which at least two brushes are supported in the main part.

[0019] The housing may contain at least two first deep-drawn parts. One of the two brushes may be placed between one of the first deep-drawn parts and the second deep-drawn part. The other of the two brushes may be placed between the other of the first deep-drawn parts and the second deep-drawn part.

[0020] The gap can be, at least partially, within a range of 0.1-0.7 mm. If the gap is 0.1 mm or larger, the amount of deflection that allows a change in the dimension of the second element is properly secured. If the gap is 0.7 mm or smaller, it is unlikely that foreign materials will enter the gap.

[0021] The housing can be formed from a metallic material. The first element and the second element can be formed from a resin material. This can make the deep-drawn parts of the housing rigid. This also allows the first element or the second element itself to be deflected without straightening the deep-drawn part in the event that the first element or the second element is deformed.

[0022] Optional combinations of the above-mentioned constituent elements and implementations of the invention in the form of methods, devices and systems may also be practiced as additional embodiments of the present invention. [ADVANTAGE OF THE PRESENT INVENTION]

[0023] According to the embodiment, the elements can remain fixed to each other in a stable manner. [BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an exploded perspective view of the DC motor according to the embodiment; Fig. 2A is a sectional view schematically showing a state that occurs before the mounting member according to the embodiment is mounted to the housing, and Fig. 2B is a sectional view schematically showing a state that occurs after the mounting member is mounted to the housing; Fig. 3 is a front view of the mounting member according to the embodiment; Fig. 4 is a front view showing that the brush holder is mounted on the housing according to the embodiment; Fig. 5 is a perspective view of an important part of the brush holder in a Fig. 4 shown area R1; Fig. 6 is a front view of the motor when viewed in the axial direction; Fig. 7 is a sectional view along AA of the Fig. 6 shown DC motor; Fig. 8 is a sectional view along BB' of the Fig. 6 shown DC motor; Fig. 9A is a perspective view showing the neighborhood of the Fig. 6 shows the first deep-drawn part S1 and Fig. 9B is a perspective view showing the neighborhood of the Fig. 6 shows the second deep-drawn part S2; Fig. 10 is a front view of the first deep-drawn part; Fig. 11 is a front view of the second deep-drawn part; Fig. 12 shows a relationship between the angle of the first slope of the pressed part and the angle of the second slope of the pressed part; and Fig. Figure 13 is a schematic diagram showing forces applied to the respective parts when the housing, the brush holder, and the mounting member are fixed to each other by deep drawing. [MODE FOR EXECUTING THE INVENTION]

[0024] A description will be given of an embodiment of the present invention with reference to the drawings. Like numerals represent like elements, and descriptions thereof are omitted. The structure described below is provided by way of example only and does not limit the scope of the invention. A DC motor is described below as an example. (DC motor)

[0025] Fig. 1 is an exploded perspective view of the DC motor according to the embodiment. As shown in Fig. 1, the DC motor 10 is provided with a housing 14 which houses components such as a rotor 12 and a permanent magnet (not shown), a brush holder 16 to which a brush 15 (see the Fig. 4) and a connection are mounted, a mounting element 18 fixed to the housing 14 together with the brush holder 16.

[0026] The rotor 12 includes a core 22 through which a shaft 20 extends in the center, a coil 24 wound around the core 22, and a commutator 26 for timely supplying an electric current supplied via the brush 15 to the coil 24. (structure for fixing)

[0027] A description will now be given of a schematic structure for fixing elements according to the embodiment. Fig. 2A is a sectional view schematically showing a state that occurs before the mounting member according to the embodiment is mounted to the housing, and Fig. 2B is a sectional view schematically showing a state that occurs after the mounting member is mounted to the housing.

[0028] A fixing structure 100 according to the embodiment is provided with a cylindrical housing 14 that houses the rotor 12, a brush holder 16 (first element) mounted on an opening 14a of the housing 14, and a mounting member 18 (second element) that sandwiches the brush holder 16 between the mounting member 18 and the housing 14. A permanent magnet (not shown) is fixed within the cylindrical housing 14 that houses the rotor 12 to form a stator 17 (see Fig. 1).

[0029] The brush holder 16 includes a main part 16b in which an outer peripheral surface 16a is formed along an inner peripheral surface 14a of the housing 14, and a pressed part 16c that is provided to face the mounting member 18 and is configured such that the outer peripheral surface 16a expands when the pressed part is pressed. The brush is supported by the main part 16b. The mounting member 18 includes a pressed part 18a that presses the pressed part 16c while the brush holder 16 is sandwiched between the mounting member 18 and the housing 14.

[0030] The pressed part 16c includes a first slope 16d that becomes higher in the axial direction away from the center of the brush holder 16 toward the outer peripheral surface 16a. The pressed part 18a includes a second slope 18c that becomes lower in the axial direction away from the center of the mounting member 18 toward the outer peripheral surface 18b thereof. This realizes a mechanism whereby the outer peripheral surface 16a of the brush holder 16 is expanded without requiring a complicated shape of the pressed part 16c or the pressed part 18a.

[0031] While the mounting element 18 in the Fig. 2A is pressed against the brush holder 16 to sandwich the brush holder 16 between the mounting member 18 and the housing 14, the part 16c of the brush holder 16 pressed by the pressing part 18a of the mounting member 18 expands the outer peripheral surface 16a of the brush holder 16, whereby the brush holder 16 can be firmly attached to the inner peripheral surface 14b of the housing 14.

[0032] In the fixing structure 100 according to the embodiment, the housing 14 includes, at the end of the housing facing the mounting member 18, a first locking part 14c that locks a first locked part 18d of the mounting member 18. The first locking part 14c is a first deep-drawn part made by deforming a part of the housing 14 so that the mounting member 18 is biased toward the housing 14 and fixed accordingly. The first deep-drawn part will be described in detail below. The mounting member 18 is elastically deformed by the first locking part 14c and locked to the housing 14 in this state. The mounting member 18 is also configured to form a gap G between the mounting member 18 and the housing 14 while the mounting member 18 is locked to the housing 14.

[0033] In a structure in a related field where multiple members are attached to each other by bringing them into close contact with each other and finally fixed by deep drawing, close contact between the members can be maintained immediately after deep drawing. However, in a case where metallic deep drawing is used to fix a resin member, a portion of the resin member expanded due to a change in the environment is pressed hard against the deep drawing part and deformed accordingly. If the resin member subsequently shrinks due to a change in temperature, a gap will be formed between the portion of the resin member deformed by the deep drawing part and the deep drawing part, resulting in the members possibly coming off.

[0034] Here, in the fixing structure 100 according to the embodiment, the mounting member 18 is configured to form a gap G between the mounting member 18 and the housing 14 while the mounting member 18 is locked to the housing 14. The gap G allows a part of the mounting member 18 to deflect when the dimension of the mounting member 18 changes due to a change in temperature or humidity. Accordingly, the deep drawing part is prevented from being deformed due to the expansion of the mounting member 18. As a result, the mounting member 18 is kept in a state of being biased by the deep drawing part to the housing 14 and is fixed accordingly, even if the mounting member 18 repeatedly expands and shrinks due to a change in the environment. Accordingly, play between the housing 14 and the mounting member 18 and between the housing 14 and the brush holder 16 can be prevented.

[0035] The DC motor 10 according to the embodiment is provided with the fixing structure 100, and the rotor 12 is located in the center of the housing 14, with the result that the looseness of the motor is minimized in the presence of repeated changes in the environment.

[0036] A detailed description is now presented using a more specific structure as an example. Fig. 3 is a front view of the mounting member according to the embodiment.

[0037] The above-described pressing part 18a is formed in the mounting member 18 at four predetermined positions on the side facing the brush holder 16. The pressing part 18a includes the second slope 18c formed as a part of the conical slope around a rotation axis C. In addition, the above-described first locking part 18d is formed at two positions on the outer peripheral surface 18b. The first locking part 18d according to the embodiment includes two convex parts 18d1 and 18d2. Alternatively, there may be only one convex part. A second locking part 18e described below is formed at two positions on the outer peripheral surface 18b of the mounting member 18.

[0038] Fig. 4 is a front view according to the embodiment, showing that the brush holder 16 is mounted on the housing 14. At least two brushes 15 are mounted on the brush holder 16. A pair of brushes 15a and 15b are placed at symmetrical positions with respect to a line DD defined when viewing the motor in the axial direction. The brush 15a is mounted between a first deep-drawn part S1 and a second deep-drawn part S2, and the brush 15b is mounted between a first deep-drawn part S1' and the second deep-drawn part S2. This prevents the brushes 15 from being influenced by forces exerted on the first deep-drawn part S1, the first deep-drawn part S1', and the second deep-drawn part S2 and positions the brushes 15 in a stable manner. The brushes 15 can be mounted on the surface of the brush holder 16 facing the housing 14 or on the surface of the brush holder 16 facing the mounting member 18.Preferably, the brushes 15 can be mounted on the surface of the brush holder 16 facing the housing 14, thus reducing the size of the motor in the axial direction. Details of the deep-drawn parts are described below.

[0039] Fig. 5 is a perspective view of an important part of the brush holder 16 in a Fig. 4. The above-described pressed part 16c is formed in the brush holder 16 at four predetermined positions on the side facing the mounting member 18. The pressed part 16c includes the first slope 16d formed as a part of the conical slope around the rotation axis C. The pressed part 16c is formed at a position with which the pressing part 18a of the mounting member 18 comes into contact when the brush holder 16 and the mounting member 18 are assembled.

[0040] By deep drawing a part of the housing 14 while the mounting member 18 is mounted on the brush holder 16, the four pressing parts 18a press the corresponding pressed parts 16c. The external forces exerted on the respective pressed parts 16c cause the outer peripheral surface 16a of the brush holder 16 to expand outward. As a result, the brush holder 16 is firmly attached to the housing 14. Furthermore, the pressing parts 18a exert a preload to bias the outer peripheral surface 16a of the brush holder 16 outward (see Fig. 2B). For this reason, even if the dimension of the housing 14, the brush holder 16, or the mounting member 18 changes due to a change in the environment, the brush holder 16 can maintain the state of being mounted ( / fitted) in the housing 14 because the first slope 16d of the pressed part 16c and the second slope 18c of the pressed part 18a are offset so as to maintain close contact.

[0041] Thus, the fixing structure 100 according to the embodiment can eliminate a clearance between the housing 14 and the brush holder 16 in the direction perpendicular to the axis (X direction or Y direction, in Fig. 2) caused by a change in the environment. The mounting member 18 receives an axial reaction force from the brush holder 16, so that a play in the axial direction (Z direction, in Fig. 2) is also prevented because the axial movement is prevented by the deep-drawn part described below.

[0042] Fig. 6 is a front view of the motor when viewed in the axial direction. Fig. 7 is a sectional view along AA of the Fig. 6 shown DC motor 10. Fig. 8 is a sectional view along BB' of the Fig. 6 shown DC motor 10. Fig. 9A is a perspective view showing the neighborhood of the Fig. 6 shows the first deep-drawn part S1 and Fig. 9B is a perspective view showing the neighborhood of the Fig. 6 shows the second deep-drawn part S2. Fig. 10 is a front view of the first deep-drawn part. Fig. 11 is a front view of the second deep-drawn part.

[0043] Fig. 6 shows a state in which the brush holder 16 is mounted on the housing 14, the mounting member 18 is pressed against the brush holder 16, and the brush holder 16 and the mounting member 18 are fixed to the housing 14 by deep drawing from three locations (first deep drawing parts S1, S1', a second deep drawing part S2) of the housing 14.

[0044] A detailed description of the first deep-drawn part S1 follows with reference to the Fig. 8, Fig. 9A and Fig. 10. The first deep-drawn part S1' of the housing 14 has the same structure as the first deep-drawn part S1, except that the first deep-drawn part S1' is placed at a position which is higher than the Fig. 6 shown line AA is symmetrical with the first deep-drawn part S1.

[0045] As in Fig. 8, etc., the housing 14 includes, at the end of the housing 14 facing the mounting member 18, the first locking part 14c that locks the first locked part 18d of the mounting member 18. Furthermore, a notched groove 14d is formed on the end surface of the housing 14 so that the first locked part 18d is inserted therein. The first locking part 14c is the first deep-drawn part S1 made by deforming a part of the housing 14 so that the mounting member 18 is biased toward the housing 14 and fixed accordingly. The first deep-drawn part S1 according to the embodiment is configured such that a corner part 18f of the first locked part 18d is pressed and locked by expanding a space between the two first locking parts 14c by using a jig, etc., in the circumferential direction. This fixes the mounting element 18 to the housing 14.

[0046] The first deep-drawn part S1 is configured such that a gap G is formed between the mounting member 18 and the housing 14 when the mounting member 18 is locked to the housing 14. The gap G allows a portion of the mounting member 18 to deflect even when the dimension of the mounting member 18 changes due to a change in temperature or humidity. Accordingly, deformation of the first locking part 14c due to expansion of the mounting member 18 is prevented. The gap also prevents the first locked part 18d from being deformed as a result of the corner part 18f being pressed hard against the first locking part 14c. Thus, the mounting member 18 is kept in a state of being biased by the first locking part S1 toward the housing 14 and thus fixed, and the mounting member 18 and the brush holder 16 are prevented from coming off.

[0047] It is preferable that the gap G be in a range of 0.1-0.7 mm. If the gap G is 0.1 mm or larger, the amount of deflection that allows a change in the dimension of the mounting element 18 is properly secured. If the gap G is 0.7 mm or smaller, foreign materials are unlikely to enter the gap G.

[0048] A detailed description of the second deep-drawn part S2 follows with reference to Fig. 7, Fig. 9B and Fig. 11.

[0049] As in Fig. As shown in Figure 7, the brush holder 16 includes a first contact part 16e that comes into contact with an end surface 14e of the housing 14 when the brush holder 16 is sandwiched between the mounting member 18 and the housing 14. This allows the brush holder 16 to be positioned with precision relative to the housing 14.

[0050] The mounting element 18 includes the second locking part 18e, which presses the first contact part 16e against the end face 14e. The housing 14 includes, at the end of the housing 14 facing the mounting element 18, a second locking part 14f, which locks the second locking part 18e. A notched groove 14g is formed on the end face 14e of the housing 14 so that the second locking part 18e is inserted therein. The second locking part 14f is the second deep-drawn part S2 produced by deforming a part of the housing 14, so that the first contact part 16e and the second locking part 18e are preloaded toward the housing 14 and fixed accordingly. The second deep-drawn part S2 according to the embodiment is configured such that a corner part 18h of the second locked part 18e is formed by expanding a space between the two second locking parts 14f using a jig, etc.is pressed and locked in the circumferential direction. This fixes the mounting element 18 and the brush holder 16 to the housing 14.

[0051] In the second deep-drawn part S2, the second locked part 18e and the first contact part 16e are in close contact with each other. Similarly, the first contact part 16e and the end face 14e are in close contact with each other. This positions the brush holder 16 and the mounting element 18 relative to the housing 14 such that play in the second deep-drawn part S2 is substantially eliminated.

[0052] As in Fig. As shown in FIG. 7, the brush holder 16 according to the embodiment includes a connector part 16f that protrudes from the main part 16b in the radial direction, and a joining part 16g that joins the main part 16b and the connector part 16f. The joining part 16g includes a second contact part 16h that comes into contact with the end surface 14e of the housing 14 when the joining part 16g is sandwiched between the mounting member 18 and the housing 14. The second contact part 16h is provided opposite to the first contact part 16e above the center of the housing 14. This causes the brush holder 16 to come into contact with two distal parts of the end surface 14e of the housing 14, thus improving positioning precision and preventing the brush holder 16 from being mounted at an angle.

[0053] Fig. 12 shows a relationship between the angle of the first slope 16d of the pressed part 16c and the angle of the second slope 18c of the pressed part 18a. As in Fig. As shown in Fig. 12, denoting the angle of the first slope 16d relative to the horizontal plane P perpendicular to the axial direction Ax of the housing 14 as α° and the angle of the second slope 18c relative to the horizontal plane P perpendicular to the axial direction Ax of the housing 14 as β°, the angles are configured such that α<β is satisfied. For example, the angle α is in a range of 20°-30°. For example, the angle β is in a range of 35°-45°. This can expand the outer peripheral surface 16a of the brush holder 16 with a relatively small force to join the brush holder 16 and the mounting member 18 to each other.

[0054] The housing 14 according to the embodiment is formed from a metallic material. The brush holder 16 and the mounting member 18 are formed from a resin material. This can make the first deep-drawn parts S1, S1' and the second deep-drawn part S2 of the housing 14 rigid. Furthermore, this allows the brush holder 16 or the mounting member 18 to be deflected without upending the first deep-drawn parts S1, S1' or the second deep-drawn part S2 after they are bent, in the event that the brush holder 16 or the mounting member 18 is deformed.

[0055] Fig. 13 is a schematic diagram showing forces exerted on the respective parts when the housing 14, the brush holder 16 and the mounting member 18 are fixed to each other by deep drawing.

[0056] As in Fig.As shown in Figure 13, when the mounting element 18 is removed from the position aligned with the plane P1 perpendicular to the axial direction Ax (extent of deflection α) and fixed to the housing 14 by the first deep-drawn parts S1 and S1', a force F in the axial direction Ax is always exerted on portions of the mounting element 18 fixed by the first deep-drawn parts S1 and S1'. This causes the mounting element 18 to always be pressed against the brush holder 16 in the second deep-drawn part S2, thereby preventing the mounting element 18 and the brush holder 16 from being lifted off the housing 14.

[0057] In the first deep-drawn parts S1 and S1', the gap G exists between the brush holder 16 and the housing 14. Sections of the mounting element 18 are held in their positions in such a way that the sections can be deformed like a spring. Deformation of the mounting element 18 can be cushioned by the gap G, thus preventing the deep-drawn parts from becoming erected due to the deformation (expansion) of the mounting element 18.

[0058] The present invention has been described using the above embodiment, but the embodiment of the present invention is not limited to those described above, and appropriate combinations or substitutions of the features of the embodiment are also encompassed by the present invention. The embodiments may be modified based on the knowledge of a person skilled in the art regarding combinations, rearrangement of the processing sequence, design changes, etc., and such modifications are also within the scope of the present invention. [DESCRIPTION OF REFERENCE NUMBERS]

[0059] S1 first deep-drawn part, S2 second deep-drawn part, 10 DC motor, 12 rotor, 14 housing, 14a opening, 14b inner peripheral surface, 14c first locking part, 14d notched groove, 14e end face, 14f second locking part, 14g notched groove, 15 brush, 16 brush holder, 16a outer peripheral surface, 16b main part, 16c pressed part, 16d first bevel, 16e first contact part, 16f connector part, 16g joining part, 16h second contact part, 18 mounting element, 18a pressed part, 18b outer peripheral surface, 18c second bevel, 18d first locked part, 18e second locked part, 18f, 18h corner part, 100 fixing structure [INDUSTRIAL APPLICABILITY]

[0060] The present invention can be applied to a structure for fixing elements together.

Claims

[1] Engine (10), comprising: a cylindrical housing (14) accommodating a rotor (12); a first element (16) mounted on an opening (14a) of the housing (14); and a second element (18) sandwiching the first element (16) as mounted between the second element (18) and the housing (14), wherein the housing includes, at one end of the housing (14) facing the second element (18), a first locking part (14c) which locks a first locked part (18d) of the second element, and the second element (18) is elastically deformed by the first locking part (14c) and locked to the housing accordingly and is configured such that a gap (G) is formed between the first locked part (18d) and the housing (14) when the second element (18) is locked to the housing (14). [2] Motor (10) according to claim 1, wherein the first locking part (14c) is a first deep-drawn part (S1, S1') produced by deforming a part of the housing (14). [3] The motor (10) of claim 2, wherein the first member (16) includes a first contact part (16e) that comes into contact with an end surface (14e) of the housing (14) when the first member (16) is sandwiched between the second member (18) and the housing (14). [4] Engine (10) according to claim 3, wherein the second element (18) includes a second locked part (18e) which presses the first contact part (16e) towards the end face (14e), the housing (14) includes, at one end of the housing (14) facing the second element (18), a second locking part (14f) which locks the second locked part (18e), and the second locking part (14f) is a second deep-drawn part (S2) produced by deforming a part of the housing (14), so that the first contact part (16e) and the second locked part (18e) are prestressed towards the housing (14) and fixed accordingly. [5] Engine (10) according to claim 4, wherein the first member (16) includes a main part (16b) in which an outer peripheral surface (16a) is formed along an inner peripheral surface (14b) of the housing (14), and a pressed part (16c) provided to face the second member (18) and configured such that the outer peripheral surface (16a) is expanded when the pressed part (16c) is pressed, and the second element (18) includes a pressing part (18a) which presses the pressed part (16c) when the first element (16) is sandwiched between the second element (18) and the housing (14). [6] The engine (10) according to claim 5, wherein the pressed part (16c) includes a first slope (16d) that becomes higher in an axial direction away from a center of the first member (16) toward the outer peripheral surface (16a) thereof. [7] The engine (10) according to claim 5, wherein the pressing part (18a) includes a second slope (18c) which becomes lower in an axial direction away from a center of the second member (18) to an outer peripheral surface (18b) thereof. [8] Engine (10) according to claim 5, wherein the pressed part (16c) includes a first slope (16d) which becomes higher in an axial direction away from a center of the first member (16) to the outer peripheral surface (16a) thereof, and the pressing part (18a) includes a second slope (18c) which becomes lower in an axial direction away from a center of the second member (18) to an outer peripheral surface (18b) thereof. [9] Engine (10) according to claim 8, wherein an angle of the first slope (16d) relative to a horizontal plane perpendicular to the axial direction of the housing (14) is designated α°, and an angle of the second slope (18c) relative to the horizontal plane perpendicular to the axial direction of the housing (14) is designated β°, where the angles are configured such that α < β is satisfied. [10] Engine (10) according to one of claims 5 to 9, wherein the first element (16) further includes a connector part (16f) protruding from the main part (16b) in a radial direction, and a joining part (16g) joining the main part (16b) and the connector part (16f), the joining part (16g) includes a second contact part (16h) which comes into contact with the end face (14e) of the housing (14) when the joining part (16g) is sandwiched between the second element (18) and the housing (14), and the second contact part (16h) is provided opposite the first contact part (16e) above the center of the housing (14). [11] Engine (10), comprising: a cylindrical housing (14) accommodating a rotor (12); a first element (16) mounted on an opening (14a) of the housing (14); and a second element (18) sandwiching the first element (16) as mounted between the second element (18) and the housing (14), wherein the first member (16) includes a main part (16b) in which an outer peripheral surface (16a) is formed along an inner peripheral surface (14b) of the housing (14), and a pressed part (16c) is provided to face the second member (18) and is configured such that the outer peripheral surface (16a) is expanded when the pressed part (16c) is pressed, and the second element (18) includes a pressing part (18a) which presses the pressed part (16c) when the second element (18) sandwiches the first element (16) between the second element (18) and the housing (14). [12] Motor (10) according to one of claims 5 to 10, wherein the first element (16) is a brush holder in which at least two brushes (15) are supported in the main part (16b). [13] Engine (10) according to claim 12, wherein the housing (14) contains at least two first deep-drawn parts (S1, S1'), one of the two brushes (15) is placed between one of the first deep-drawn parts (S1, S1') and the second deep-drawn part (S2), and the other of the two brushes (15) is placed between the other of the first deep-drawn parts (S1, S1') and the second deep-drawn part (S2). [14] Motor (10) according to one of claims 1 to 10, wherein the gap (G) is at least partially in a range of 0.1-0.7 mm. [15] Engine (10) according to one of claims 1 to 14, wherein the housing (14) is made of a metallic material, and the first element (16) and the second element (18) are formed from a resin material.

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