Motor, motor device and method for manufacturing the motor device

Abstract

A motor (12) comprises: a housing (20) that accommodates a rolling bearing (22); a shaft (24) rotatably supported by the rolling bearing and having a fixing section (24A) at an end section on one side of an axial direction of the shaft, wherein a rotating element (14) is fixed to the fixing section by pressing; a cover (26) that has a shaft receiving section (48) facing an end section on the other side of the axial direction of the shaft via a gap (50), and a cover section (44) formed around the shaft receiving section and having flexibility; and an intermediate section (30) that is arranged between the housing and the cover section.

Description

Cross-reference to related registration

[0001] The present application is based on the earlier Japanese patent application No. 2023-122054, which was filed in Japan on July 26, 2023, and claims the priority benefit thereof, the entire disclosure thereof being incorporated herein by reference. Technical field

[0002] The present invention relates to a motor, a motor device and a method for manufacturing the motor device. State of the art

[0003] Japanese Patent No. 2520887 discloses an electrically driven device comprising: a cylindrical housing with a base; a stator provided in the housing; a rotor arranged in the housing to be concentric with the stator; a rotating shaft on which the rotor is mounted, one end section of the rotating shaft facing a base surface of the housing, the other end section of the rotating shaft being located outside the housing; a bearing rotatably supporting the rotating shaft in the housing; a flexible section formed on the base surface of the housing to be displaceable in an axial direction of the rotating shaft; a gap with which a minimum clearance is set, which is necessary to prevent interference between the flexible section and one end section of the rotating shaft that occurs when the rotating shaft is turned;and a driven element that is pressed in one direction from the other end section to the first end section and is fixed to the other end section of the rotating shaft. Summary of the invention

[0004] As a result of extensive research by the inventors, a point of improvement has been identified in the configuration of the above electrically driven device, in which the flexible section is bent when the driven element is pressed on, thus supporting the rotating shaft by a stop across the flexible section. The issue is that the flexible section can be damaged during bending, allowing foreign matter or water to penetrate the interior of the housing through the damaged section.

[0005] With regard to the above point, the present disclosure has an objective of providing a motor, a motor device and a method for manufacturing the motor device which can suppress a breakage of a shaft receiving section when a rotating element is pressed onto a shaft.

[0006] A first aspect of the present revelation is an engine which has the following features: a housing that accommodates a rolling bearing; a shaft which is rotatably supported by the rolling bearing and has a fixing section at an end section on one side of an axial direction of the shaft, wherein a rotating element is fixed to the fixing section by pressing it on; a casing comprising a shaft receiving section which faces an end section on the opposite side of the axial direction of the shaft via a gap, and a cover section which is formed around the shaft receiving section and has flexibility; and an intermediate section that is placed between the housing and the cover section.

[0007] A second aspect of the present disclosure is a motor device comprising: the motor according to the first aspect; and the rotating element.

[0008] A third aspect of the present disclosure is a method for manufacturing the motor device according to the second aspect, wherein this method comprises a pressing operation for fixing the rotating element to the end section on one side of the axial direction of the shaft by pressing, wherein during the pressing process a load is transferred during the pressing of the rotary element via the rolling bearing, the housing and the intermediate section to the cover section, thereby bending the cover section to bring the end section on the other side of the axial direction of the shaft into contact with a tool via the shaft receiving section, and The pressing on of the rotary element is completed, while the end section on the other side of the axial direction of the shaft is in contact with the tool via the shaft receiving section.

[0009] According to the present disclosure, a motor, a motor device and a method for manufacturing the motor device are provided which can suppress a breakage of a shaft receiving section when a rotating element is pressed onto a shaft. Brief description of the drawings Fig. 1 is a longitudinal sectional view that schematically represents a motor device according to the present embodiment; Fig. Figure 2 is a drawing to describe a first step of a pressing process according to the present embodiment; Fig. Figure 3 is a drawing to describe a second step of the pressing process according to the present embodiment; Fig. Figure 4 is a drawing to describe a third step of the pressing process according to the present embodiment; Fig. Figure 5 is a graph that represents a relationship between a displacement amount of a sealing material and a load generated by the displacement of the sealing material according to the present embodiment; Fig. 6 is a longitudinal section view showing a cladding according to a first modification; Fig. Figure 7 is a graph that represents a relationship between a displacement amount of a sealing material and a load caused by the displacement of the sealing material, according to the first modification; Fig. 8 is a longitudinal section view showing a cladding according to a second modification; Fig. Figure 9 is a graph that represents a relationship between a displacement amount of a sealing material and a load caused by the displacement of the sealing material, according to the second modification; Fig. Figure 10 is a longitudinal sectional view showing a motor device according to a third modification; Fig. Figure 11 is a graph that represents a relationship between a displacement amount of a sealing material and a load caused by the displacement of the sealing material according to the third modification; Fig. Figure 12 is a longitudinal sectional view showing a motor device according to a fourth modification; Fig. Figure 13 is a longitudinal sectional view showing a motor device according to a fifth modification; Fig. Figure 14 is a longitudinal sectional view showing an engine device according to a sixth modification; and Fig. Figure 15 is a longitudinal sectional view showing a motor device according to a seventh modification. Description of the embodiments

[0010] One embodiment of the present disclosure is described below.

[0011] Fig. Figure 1 is a longitudinal sectional view schematically illustrating a motor device 10 according to the present embodiment. The motor device 10 comprises a motor 12 and a fan wheel 14. The fan wheel 14 is an example of a "rotating element" in the present disclosure. The motor 12 is, for example, a brushless external rotor motor. The motor 12 comprises a stator 16, a rotor 18, a housing 20, a rolling bearing 22, a shaft 24, a casing 26, a substrate 28, and a sealing material 30.

[0012] The side indicated by arrow A represents one side of the axial direction of motor 12, and the side indicated by arrow B represents the other side of the axial direction of motor 12. It should be noted that, hereinafter, one side of the axial direction of each section will be referred to as "side A" and the other side of the axial direction of each section will be referred to as "side B".

[0013] The stator 16 is configured to have a circular annular shape. The stator 16 has a stator core 32 and a winding (not shown). The stator core 32 is wound with the winding.

[0014] The rotor 18 has a rotor housing 34 and a rotor magnet 36. The rotor housing 34 is cylindrical with a closed end. The rotor magnet 36 is fixed to the inner circumferential surface of the rotor housing 34. The stator 16 is arranged inside the rotor housing 34. The rotor magnet 36 is arranged radially outside the stator 16 and faces the stator 16.

[0015] The housing 20 has a base section 38 and a center section 40. The base section 38 is formed in a plate shape and is arranged in such a way that its thickness direction coincides with the axial direction of the motor 12. The center section 40 is arranged on side A of the base section 38. The center section 40 is formed in a cylindrical shape and is arranged coaxially with the central axis of the motor 12. The base section 38 and the center section 40 can be formed as a single piece or can be separate entities. The center section 40 is pressed into the stator core 32, thereby supporting the stator 16.

[0016] The rolling bearing 22 is mounted within the center piece 40. The rolling bearing 22 is located at an end section of the center piece 40 on side A. The rolling bearing 22 has an outer ring 22A, a plurality of rolling elements 22B, and an inner ring 22C. The outer ring 22A is pressed into the center piece 40, thereby holding the rolling bearing 22 in place. The inner ring 22C is rotatably supported by the outer ring 22A via the plurality of rolling elements 22B.

[0017] The shaft 24 is in the form of a rod and is made of iron. The shaft 24 extends along the axial direction of the motor 12 and is arranged on the motor 12's central axis. The shaft 24 is pressed into the inner ring 22C, thereby rotatably supporting the shaft 24 against the rolling bearing 22. The rotor housing 34 is integrally and rotatably fixed to the shaft 24. The end section of the shaft 24 on side A is designed as a fixing section 24A for securing the fan wheel 14. The fixing section 24A projects from the rotor housing 34 to the side indicated by arrow A.

[0018] The fan wheel 14 has a through-hole 14A that extends through it in the axial direction. The through-hole 14A penetrates along the central axis of the fan wheel 14. The fixing section 24A is pressed into the through-hole 14A, thereby fixing the fan wheel 14 to the fixing section 24A. That is, the fan wheel 14 is fixed to the fixing section 24A by being pressed down from side A.

[0019] The fairing 26 is arranged on side B of the base section 38. The fairing 26 has a convex section 42 and a cover section 44. The convex section 42 is located on the central axis of the engine 12. The convex section 42 is shaped such that part of the fairing 26 is convex towards side A. Within the convex section 42, a concave section 46 is formed, which opens towards side B.

[0020] The upper section of the curved section 42 is designed as a shaft receiving section 48 for receiving the shaft 24 when the fan wheel 14 is pressed onto the shaft 24. The shaft receiving section 48 is designed to be planar and extends in the direction perpendicular to the central axis of the motor 12. Viewed in the axial direction of the motor 12, the shaft receiving section 48 is circular in shape. The shaft receiving section 48 faces an end section on side B of the shaft 24 via a gap 50. The dimension of the gap 50 (i.e., a width dimension in the axial direction of the motor 12) is set to the minimum value of a dimension that ensures clearance between the shaft 24 and the shaft receiving section 48 even when the shaft 24 is displaced to side B due to a deformation of the rolling bearing 22 caused by the weight of the fan wheel 14 (i.e.,, a displacement of the inner ring 22C to side B with respect to the outer ring 22A).

[0021] The cover section 44 is formed around the shaft receiving section 48. In particular, a part of the casing 26, which differs from the curved section 42, is the cover section 44. The cover section 44 is formed in a plate shape and is arranged in such a way that its thickness direction coincides with the axial direction of the motor 12. The cover section 44 is arranged on side B of the base section 38, facing the base section 38. A space 52, which will be described later, is formed between the base section 38 and the cover section 44 for receiving the substrate 28.

[0022] The entire casing 26, which includes the cover section 44, is made of a resin. Thus, the cover section 44 has flexibility. That is, as will be described later, the cover section 44 is configured to bend towards side B when a load is applied towards side B during the pressing of the fan wheel 14 through the sealing material 30.

[0023] The substrate 28 is formed in a plate shape and is arranged in such a way that its thickness direction coincides with the axial direction of the motor 12. Electronic components and similar items for supplying current to the winding are mounted on the substrate 28. Through holes 28A and 38A, extending in the axial direction of the motor 12, are formed in the substrate 28 and the base section 38 as described above. The portion on side B of the shaft 24 is inserted into each of the through holes 28A and 38A.

[0024] The sealing material 30 extends from the cover section 44 to the base section 38 and is interposed between the housing 20 (in particular the cover section 44) and the base section 38. The end section on side B of the sealing material 30 is fixed to the cover section 44. The end section on side A of the sealing material 30 is in contact with the base section 38. The sealing material 30 is an example of an "interposed section" of the present disclosure. The sealing material 30 is annular in shape along the outer circumference of the cover 26 (in particular the base section 38) and surrounds the substrate 28. The sealing material 30 seals the space between the housing 20 and the cover section 44 in order to seal the space 52.

[0025] The sealing material 30 has elasticity. The sealing material 30 can be made of rubber or an elastomer. The sealing material 30 has a cross-sectional shape that tapers towards side A. As will be described later, the sealing material 30 has sufficient stiffness to bend the cover section 44 by elastic deformation in the compression direction towards side B when a load is applied from the housing 20 during the pressing of the fan wheel 14. The sealing material 30 is selected to have a lower stiffness than the cover section 44 in order to dampen the load applied to the rolling bearing 22 during the pressing of the fan wheel 14.That is, if the displacement amount of the sealing material 30 in the compression direction and the displacement amount of the cover section 44 in the bending direction (both being the displacement amounts of the motor 12 in the axial direction) are compared at the position where a load is applied from the housing 20 via the sealing material 30 to the cover section 44, the displacement amount of the sealing material 30 in the compression direction is less than the displacement amount of the cover section 44 in the bending direction.

[0026] Next, regarding Fig. 2 to Fig. 5 describes a method for manufacturing the motor device 10 according to the present embodiment. It should be noted that the stator 16, the rotor 18 and the substrate 28 in Fig. 2 to Fig. 5 are not shown.

[0027] The method for manufacturing the motor device 10 according to the present embodiment is a method for manufacturing the motor device 10 by pressing the fan wheel 14 onto the shaft 24 and includes a pressing operation for pressing the fan wheel 14 onto the shaft. In the pressing operation, side A is defined as an upper side in the vertical direction. Furthermore, in the pressing operation, a tool 54 is inserted from side B into the concave section 46, and one end of the tool 54 is brought into contact with the shaft receiving section 48 from side B. The pressing operation is described in detail below by dividing it into a first step ST1, a second step ST2, and a third step ST3.

[0028] Fig. Figure 2 is a drawing illustrating the first step ST1. The first step ST1 involves attaching the fan wheel 14 to the fixing section 24A to establish an initial state. During the first step ST1, the sealing material 30 generates a load F1 as a reaction force against the weight of the fan wheel 14, and this load F1 is applied to the outer ring 22A of the rolling bearing 22. Furthermore, the displacement of the sealing material 30 during the first step ST1 is L1 due to the weight of the fan wheel 14, and a gap 50 with dimension ΔL is maintained between the shaft 24 and the shaft receiving section 48. It should be noted that the displacement L1 represents a compressible deformation of the sealing material 30.

[0029] Fig. Figure 3 is a drawing illustrating the second step ST2. The second step ST2 is a transition from the initial state to a state in which the shaft 24 is brought into contact with the tool 54 via the shaft receiving section 48. That is, in the second step ST2, the load applied when pressing on the fan wheel 14 is transferred via the rolling bearing 22, the housing 20, and the sealing material 30 to the cover section 44, in order to bend the cover section 44 towards side B, thereby bringing the shaft 24 into contact with the tool 54 via the shaft receiving section 48.

[0030] In the second step ST2, when the pressing load is applied to the fan wheel 14, the sealing material 30 generates a load F2 as a reaction force, and the load F2 is applied to the outer ring 22A of the rolling bearing 22. Furthermore, the displacement of the sealing material 30 in the second step ST2 is a displacement L2 due to the bending of the cover section 44, which occurs until the shaft 24 is brought into contact with the tool 54 via the shaft receiving section 48. It should be noted that the displacement L2 represents a compressible deformation of the sealing material 30.

[0031] Fig. Figure 4 is a drawing illustrating the third step ST3. The third step ST3 is a step from the state in which the shaft 24 is brought into contact with the tool 54 via the shaft receiving section 48, to a state in which the pressing on of the fan wheel 14 is completed. That is, in the third step ST3, the fixing section 24A of the shaft 24 is pressed into a predetermined position in the through-hole 14A of the fan wheel 14 while the position of the shaft 24 is held by bringing the shaft 24 into contact with the tool 54 via the shaft receiving section 48.

[0032] In the third step ST3, the pressing load is applied to the fan wheel 14 in the state where the shaft 24 is brought into contact with the tool 54 via the shaft receiving section 48. This deforms the shaft receiving section 48 in the compression direction, while the shaft receiving section 48 generates a load Fc as a reaction force. In this case, the amount of deformation of the shaft receiving section 48 is a deformation amount Lc. Against the deformation of the shaft receiving section 48, the sealing material 30 generates a load F3 as a reaction force. The load F3 is applied to the outer ring 22A of the rolling bearing 22. In the third step ST3, the displacement amount of the sealing material 30 is a deformation amount L3, which includes a displacement amount due to the bending of the cover section 44 and a deformation amount Lc of the shaft receiving section 48.It should be noted that the deformation amount L3 has a compressible deformation amount of the sealing material 30.

[0033] Fig. Figure 5 is a graph illustrating the relationship between the displacement of the sealing material 30 and the load caused by this displacement, according to the present embodiment. As described above, in the first step ST1, the load F1 is applied to the outer ring 22A of the rolling bearing 22, corresponding to the displacement L1 of the sealing material 30. In the second step ST2, the load F2 is applied to the outer ring 22A of the rolling bearing 22, corresponding to the displacement L2 of the sealing material 30. In the third step ST3, the load F3 is applied to the outer ring 22A of the rolling bearing 22, corresponding to the deformation L3 of the sealing material 30. The difference between the displacement amount L2 and the displacement amount L1 is essentially equal to the dimension ΔL between the shaft 24 and the shaft receiving section 48.Furthermore, the difference between the deformation amount L3 and the displacement amount L2 is essentially equal to the displacement amount Lc, which is a compressible deformation amount of the shaft receiving section 48. In the case of deformation amount L3, the contact load applied to the fan wheel 14 reaches its maximum.

[0034] Here, a permissible load in the thrust direction is selected for the rolling bearing 22. If the load applied to the rolling bearing 22 exceeds the permissible load when the pressing load applied to the fan wheel 14 has reached its maximum, the rolling bearing 22 may be damaged.

[0035] However, according to the method for manufacturing the motor device 10 according to the present embodiment, the sealing material 30 is elastically deformed in the compression direction from the second step ST2 to the third step ST3, even if the shaft receiving section 48 is deformed in the compression direction, thereby reducing the load applied to the rolling bearing 22. That is, compared to a load progression from the first step ST1 to the second step ST2, the load progression from the second step ST2 to the third step ST3 is gradual. Thus, the load applied to the rolling bearing 22 is prevented from exceeding the permissible load.

[0036] In the present embodiment, the stiffness of the sealing material 30 is selected such that the load F3, corresponding to the deformation amount L3, falls below the permissible load. However, since the sealing material 30 has a dimensional error, it is sufficient that the displacement amount corresponding to the load F3 falls within an acceptable range centered on the deformation amount L3. It should be noted that the load applied to the rolling bearing 22 when the shaft receiving section 48 is deformed in the compression direction from the second step ST2 to the third step ST3 is further reduced by the cover section 44, which is bent in the direction of side B.

[0037] Next, the effects of the present embodiment will be described.

[0038] As described in detail above, in the present embodiment, the housing 26 has the shaft receiving section 48, which faces the end section of the shaft 24 on side B via the gap 50, and the cover section 44, which is formed around the shaft receiving section 48 and has flexibility. The sealing material 30 is positioned between the housing 20 and the cover section 44. During the pressing-on process of the fan wheel 14, the load applied during pressing is transferred via the rolling bearing 22, the housing 20, and the sealing material 30 to the cover section 44 in order to bend the cover section 44, thereby bringing the shaft 24 into contact with the tool 54 via the shaft receiving section 48.Thus, for example, compared to a case in which the shaft receiving section 48 is bent by the amount of the gap 50 between the shaft 24 and the shaft receiving section 48, the deformation of the shaft receiving section 48 caused when pressing on the fan wheel 14 can be suppressed. Therefore, breakage of the shaft receiving section 48 when pressing on the fan wheel 14 can be prevented.

[0039] Furthermore, the casing 26 has the shaft receiving section 48. It can be assumed that a through-hole is provided instead of the shaft receiving section 48, the shaft 24 is inserted into the through-hole, and the tool 54 directly receives the shaft 24. However, in this case, a closing element for the through-hole is required, which increases costs. Moreover, foreign matter or water can penetrate through the through-hole. In this respect, the present embodiment, compared to the casing with the through-hole, avoids an increase in the number of components because the casing 26 has the shaft receiving section 48, and furthermore, costs can be reduced. Moreover, foreign matter or water can be prevented from penetrating through the through-hole because the casing 26 does not have one.

[0040] Furthermore, the shaft receiving section 48 is formed in the casing 26. This reduces the number of components compared to a case where the shaft receiving section 48 is separate from the casing 26, thereby reducing costs.

[0041] Furthermore, the sealing material 30 possesses elasticity. Thus, during the pressing-in process, the sealing material 30 is elastically deformed even if the shaft receiving section 48 is deformed in the compression direction, thereby reducing the load applied to the rolling bearing 22. Since the load applied to the rolling bearing 22 can be prevented from exceeding its permissible load, failure of the rolling bearing 22 can be suppressed.

[0042] Furthermore, the sealing material 30 is used to reduce the load applied to the rolling bearing 22. This allows for a reduction in the number of components compared to a case where a load-reducing element is used instead of the sealing material 30, thereby reducing costs.

[0043] Furthermore, the sealing material 30 has a cross-sectional shape that tapers towards the housing 20. Thus, by adjusting the cross-sectional shape (in particular the cross-sectional shape of a tapered peak section) of the sealing material 30, the mode of elastic deformation of the sealing material 30 can be adjusted, and furthermore, the reduction amount of the load applied to the rolling bearing 22 can be adjusted.

[0044] Furthermore, the sealing material 30 is formed in an annular shape along the outer circumference of the casing 26. This reduces the load applied when pressing the fan wheel 14 onto the rolling bearing 22, while ensuring a seal for the space 52 that accommodates the substrate 28.

[0045] Furthermore, the cover section 44 has flexibility. Thus, the load applied to the rolling bearing 22 when the shaft receiving section 48 is deformed in the compression direction during the pressing process can also be reduced by the elastic deformation of the cover section 44.

[0046] Next, modifications of the present embodiment will be described.

[0047] Fig. Figure 6 is a longitudinal section view showing the cladding 26 according to a first modification. In the first modification, the shaft receiving section 48 is formed from a metal plate.

[0048] Fig. Figure 7 is a graph that illustrates the relationship between the displacement of the sealing material 30 and the load caused by this displacement, according to the first modification. In the first modification, the compressible deformation of the shaft receiving section 48 is suppressed from the second step ST2 to the third step ST3, since the shaft receiving section 48 is formed from a metal plate. Thus, an increase in the load applied to the rolling bearing 22 can be suppressed from the second step ST2 to the third step ST3, thereby keeping the load constant.

[0049] Fig. Figure 8 is a longitudinal section view showing the cladding 26 according to a second modification. In the second modification, the shaft receiving section 48 is thin-walled compared to the cover section 44. That is, the thickness t1 of the shaft receiving section 48 is less than the thickness t2 of the cover section 44.

[0050] Fig. Figure 9 is a graph that illustrates the relationship between the displacement of the sealing material 30 and the load caused by this displacement, according to the second modification. In the second modification, the compressible deformation of the shaft receiving section 48 is suppressed from the second step ST2 to the third step ST3 because the shaft receiving section 48 is thin-walled compared to the cover section 44. Thus, an increase in the load applied to the rolling bearing 22 can be suppressed from the second step ST2 to the third step ST3.

[0051] Fig. Figure 10 is a longitudinal sectional view showing the motor device 10 according to a third modification. In the third modification, the cover section 44 extends through to the shaft receiving section 48 and has a cross-sectional shape that is convexly curved towards the housing 20.

[0052] Fig. Figure 11 is a graph that illustrates the relationship between the displacement of the sealing material 30 and the load caused by this displacement, according to the third modification. In the third modification, the cover section 44 bends more easily towards side B compared to a case where the cover section 44 is formed in a flat plate shape, because the cover section 44 has a cross-sectional shape that is convexly curved towards the housing 20. Thus, the cover section 44 bends from the first step ST1 to the third step ST3 even when the shaft receiving section 48 is deformed in the compression direction, thereby suppressing an increase in the load applied to the rolling bearing 22.

[0053] Fig. Figure 12 is a longitudinal sectional view showing the motor device 10 according to a fourth modification. In the fourth modification, the sealing material 30 is designed to have a constant cross-section (i.e., a constant thickness) along the axial direction of the shaft 24.

[0054] Fig. Figure 13 is a longitudinal sectional view showing the motor device 10 according to a fifth modification. In the fifth modification, the sealing material 30 has a restricted cross-sectional shape when viewed in the direction perpendicular to the axial direction of the shaft 24 (i.e., the radial direction of the motor device 10).

[0055] Fig. Figure 14 is a longitudinal sectional view showing the motor device 10 according to a sixth modification. In the sixth modification, the sealing material 30 has a cross-sectional shape that tapers towards the opposite side of the housing 20 (i.e., the side of the cover 26).

[0056] Fig.Figure 15 is a longitudinal sectional view showing the motor device 10 according to a seventh modification. In the seventh modification, the cover section 44 of the casing 26 has a first extension section 56 extending towards the base section 38, and a second extension section 58 extending radially from an end section of the first extension section 56 to the outside of the motor device 10. The sealing material 30 is provided on the second extension section 58 and is configured to have a constant cross-section (i.e., a constant thickness) along the axial direction of the shaft 24. The sealing material 30 has a concave section 60 open to one side of the shaft 24. A radially outer end section of the base section 38 is fitted into the concave section 60.A section of the sealing material 30, which is interposed between the housing 20 and the cover section 44, is an example of the ‘interposed section’ of the present disclosure.

[0057] Furthermore, the sealing material 30 can be provided without elasticity, although in the embodiment above, the sealing material 30 is provided with elasticity between the housing 20 and the cover section 44. In addition, instead of the sealing material 30, a side wall extending from the cover section 44 to the housing 20 can be provided. The side wall is an example of the "intermediate section" of the present disclosure.

[0058] Furthermore, a variety of sealing materials 30 can be provided along the outer circumference of the cladding 26, although in the above embodiment the annular sealing material 30 is provided between the housing 20 and the cover section 44.

[0059] Furthermore, the sealing material 30 can be selected to have a higher stiffness than that of the cover section 44, although in the above embodiment the sealing material 30 is selected to have a lower stiffness than that of the cover section 44.

[0060] Furthermore, the motor device 10 can have a rotating element that is different from the fan wheel 14, although in the above embodiment the motor device 10 has the fan wheel 14. In addition, the rotating element can, for example, be a driven element such as a gear.

[0061] Furthermore, the above multitude of modifications can be implemented in combination, where appropriate.

[0062] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above. The present disclosure can, of course, be implemented with various modifications within a scope that does not deviate from the core of the present disclosure.

[0063] The following additional remarks are also provided with regard to the present disclosure. (Supplementary Note 1)

[0064] Motor (12) with: a housing (20) that accommodates a rolling bearing (22); a shaft (24) which is rotatably supported by the rolling bearing and has a fixing section (24A) at an end section on one side of an axial direction of the shaft, wherein a rotating element (14) is fixed to the fixing section by pressing it on; a casing (26) having a shaft receiving section (48) which faces an end section on the other side of the axial direction of the shaft via a gap (50), and a cover section (44) which is formed around the shaft receiving section and has flexibility; and an intermediate section (30) which is intermediate between the housing and the cover section. (Supplementary Note 2)

[0065] Engine according to supplementary note 1, wherein the intermediate section has flexibility. (Supplementary Note 3)

[0066] Engine according to Supplementary Note 1 or Supplementary Note 2, wherein the intermediate section is a sealing material (30) that seals a space between the housing and the cover section. (Supplementary Note 4)

[0067] Engine according to supplementary note 3, wherein The sealing material has a cross-sectional shape that tapers towards the housing. (Supplementary Note 5)

[0068] Engine in accordance with Supplementary Note 3 or Supplementary Note 4, wherein The sealing material is formed in a circular shape along an outer circumference of the cladding. (Supplementary Note 6)

[0069] Engine according to one of the supplementary notes 1 to 5, wherein The shaft receiving section is made of metal. (Supplementary Note 7)

[0070] Engine according to one of the supplementary notes from note 1 to note 6, wherein The shaft receiving section is thin-walled compared to the cover section. (Supplementary Note 8)

[0071] Engine according to one of the supplementary notes from note 1 to note 7, wherein the cover section has a cross-sectional shape that is convexly curved towards the housing. (Supplementary Note 9)

[0072] Motor device (10) with: the engine in accordance with one of the supplementary notes from note 1 to note 8; and the rotating element. (Supplementary Note 10)

[0073] Method for manufacturing the motor device according to supplementary note 9, comprising: a pressing process to fix the rotating element to the end section on one side of the axial direction of the shaft by pressing, wherein during the pressing process a load is transferred during the pressing on of the rotary element via the rolling bearing, the housing and the intermediate section to the cover section, thereby bending the cover section to bring the end section on the other side of the axial direction of the shaft into contact with a tool (54) via the shaft receiving section, and The pressing on of the rotary element is completed, while the end section on the other side of the axial direction of the shaft is in contact with the tool via the shaft receiving section. (Supplementary Note 11)

[0074] Method for manufacturing the motor device in accordance with Supplementary Note 10, wherein the intermediate order section has an elasticity and The pressing process also involves elastic deformation of the intermediate section to reduce the load applied to the rolling bearing. (Supplementary Note 12)

[0075] Method for manufacturing the motor device in accordance with Supplementary Note 10 or Supplementary Note 11, which further includes elastic deformation of the cover section during the pressing process in order to reduce the load applied to the rolling bearing. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2023-122054

[0001] JP 2520887

[0003]

Claims

[1] Motor (12) with: a housing (20) that accommodates a rolling bearing (22); a shaft (24) which is rotatably supported by the rolling bearing and has a fixing section (24A) at an end section on one side of an axial direction of the shaft, wherein a rotating element (14) is fixed to the fixing section by pressing it on; a casing (26) having a shaft receiving section (48) which faces an end section on the other side of the axial direction of the shaft via a gap (50), and a cover section (44) which is formed around the shaft receiving section and has flexibility; and an intermediate section (30) which is intermediate between the housing and the cover section. [2] Motor according to claim 1, wherein the intermediate section has flexibility. [3] Motor according to claim 1 or 2, wherein the intermediate section is a sealing material (30) that seals a space between the housing and the cover section. [4] Motor according to claim 3, wherein the sealing material has a cross-sectional shape which is tapered towards the housing. [5] Motor according to claim 3 or 4, wherein the sealing material is formed in an annular shape along an outer circumference of the casing. [6] Motor according to any one of claims 1 to 5, wherein the shaft receiving section is made of a metal. [7] Motor according to any one of claims 1 to 6, wherein the shaft receiving section is thin-walled compared to the cover section. [8] Motor according to any one of claims 1 to 7, wherein the cover section has a cross-sectional shape that is convexly curved in the direction of the housing. [9] Motor device (10) with: the motor according to any one of claims 1 to 8; and the rotating element. [10] Method for manufacturing the motor device according to claim 9, comprising: a pressing process to fix the rotating element to the end section on one side of the axial direction of the shaft by pressing, wherein during the pressing process a load is transferred during the pressing on of the rotary element via the rolling bearing, the housing and the intermediate section to the cover section, thereby bending the cover section to bring the end section on the other side of the axial direction of the shaft into contact with a tool (54) via the shaft receiving section, and The pressing on of the rotary element is completed, while the end section on the other side of the axial direction of the shaft is in contact with the tool via the shaft receiving section. [11] Method for manufacturing the motor device according to claim 10, wherein the intermediate section has an elasticity and the method further comprises elastic deformation of the intermediate section during the pressing process in order to reduce the load applied to the rolling bearing. [12] Method for manufacturing the motor device according to claim 10 or 11, which further comprises elastic deformation of the cover section during the pressing process in order to reduce the load applied to the rolling bearing.

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