Sealing structure and motor

Abstract

The sealing structure is provided with: a partition wall member (20) that partitions a first space (S1) and a second space (S2) from each other between the first space (S1) and the second space (S2) arranged side by side, a first member (10) that divides the first space (S1), a second member (30) that divides the second space (S2), a first gasket portion (41) that seals the first space (S1) between the first member (10) and the partition wall member (20), and a second gasket portion (42) that seals the second space (S2) between the second member (30) and the partition wall member (20). The first gasket portion (41) and the second gasket portion (42) are formed integrally as one gasket (40) and are attached to the partition wall member (20).

Description

Technical Field

[0001] This application relates to a sealing structure and a motor using the sealing structure. Background Technology

[0002] Conventionally, as one type of sealing structure, there is a known structure that seals the space by using a sealing member disposed between a dividing member that divides the space of the built-in component and has an opening or hole and a cover member that blocks the opening of the dividing member. For example, Patent Document 1 discloses a structure that uses a sealing member to seal between a housing (dividing member) housing a deceleration mechanism and a cover (cover member) that blocks the opening of the housing.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 6795358 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The sealing structure disclosed in Patent Document 1, as described above, seals a space using a sealing member disposed between the housing and the cover. However, sometimes it is required that the sealing structure seal both of two spaces arranged side by side. For example, in the case where the dividing member described above is disposed side by side with the cover member above it. In this case, in the sealing structure disclosed in Patent Document 1, in addition to the sealing member that seals between the dividing member (housing) and the cover member (cover) that divides one of the two spaces, a new sealing member is required to seal between the dividing member that divides the other of the two spaces and the cover member, resulting in an increase in the number of components.

[0008] This application is made in view of such a problem, and one of its objectives is to provide a sealing structure that can suppress the increase in the number of components and seal both sides of two spaces arranged side by side, as well as a motor using this sealing structure. It should be noted that this application is not limited to this objective, and another objective is to achieve the effects derived from the structures shown in the specific embodiments described later, and effects that cannot be obtained by conventional technology.

[0009] Solution for solving the problem

[0010] The sealing structure and motor disclosed herein can be implemented as described in the following disclosed solutions (application examples), solving at least a portion of the aforementioned problems.

[0011] Solution 1. The sealing structure disclosed herein comprises: a partition member separating the first space and the second space between two adjacent spaces; a first member dividing the first space; a second member dividing the second space; a first gasket portion sealing the first space between the first member and the partition member; and a second gasket portion sealing the second space between the second member and the partition member. The first gasket portion and the second gasket portion are integrally formed as a single gasket and are mounted on the partition member.

[0012] Option 2. The motor disclosed herein comprises: a bottomed cylindrical housing; a rotor and a stator housed within the housing; a shaft integrally rotating with the rotor; a bearing supporting the shaft for rotational movement; and an end cover that seals the opening of the housing and is disposed opposite to the housing of a driven device disposed relative to the housing on the side of the opening. The end cover has a receiving portion that houses the bearing on its inner side in a radial direction centered on the axis of the shaft. In this motor, the sealing structure described in Option 1 above is applied to the end cover as the partition member, the housing as the first member, and the housing as the second member.

[0013] Invention Effects

[0014] According to the sealing structure and motor disclosed herein, it is possible to suppress the increase in the number of components and to seal both sides of the two spaces arranged side by side. Attached Figure Description

[0015] Figure 1 It is an axial sectional view showing the motor with the sealing structure described in the embodiment and the main parts of the driven device driven by the motor.

[0016] Figure 2 Viewed from the first axial side Figure 1 A 3D view of the motor.

[0017] Figure 3 Viewed from the first axial side Figure 1 A three-dimensional view of the end caps and gaskets of the motor.

[0018] Figure 4 Viewed from the second axial side Figure 1 A top view of the motor.

[0019] Figure 5 yes Figure 1 A partial axial cross-sectional view of the end cover and gasket of the motor (corresponding to) Figure 4 (Diagram of the XX-direction sectional view).

[0020] Figure 6yes Figure 1 A partial axial cross-sectional view of the end cover and gasket of the motor (corresponding to) Figure 4 (Diagram of the YY-direction sectional view).

[0021] Figure 7 Viewed from the first axial side Figure 1 A three-dimensional view of the pads in the motor. Detailed Implementation

[0022] Referring to the accompanying drawings, the sealing structure and motor as embodiments will be described. The embodiments shown below are merely illustrative and are not intended to exclude various modifications and technical applications not explicitly shown in the following embodiments. The structures of this embodiment can be modified and implemented in various ways without departing from their spirit.

[0023] The sealing structure of this embodiment seals both the first space and the second space, which are arranged side by side. This sealing structure is used in the motor of this embodiment (an example of an object to which this sealing structure is applied). The sealing structure includes a first member dividing the first space, a second member dividing the second space, and a partition member separating the first space and the second space. The sealing structure also includes a first gasket portion sealing the first space between the first member and the partition member, and a second gasket portion sealing the second space between the second member and the partition member. The first gasket portion and the second gasket portion are formed integrally as a single gasket (sealing member) and are mounted on the aforementioned partition member.

[0024] [1. Structure]

[0025] Figure 1 This is an axial cross-sectional view showing the motor 1, which utilizes the sealing structure described in this embodiment, and the main components of the driven device driven by the motor 1. The motor 1 is, for example, an internal rotor type brushless motor, comprising a cylindrical stator 2, a rotor 3 disposed inside the stator 2, and a shaft 4 that rotates integrally with the rotor 3. In addition, the motor 1 includes a bottomed cylindrical housing 10 that houses the stator 2 and the rotor 3, and an end cover 20 that seals the opening of the housing 10.

[0026] In this embodiment, the outer casing 10 extends along one of the directions of the axis C of the shaft 4 (hereinafter referred to as the "axial direction"). Figure 1 The opening is located on the left side of the diagram. The end cap 20 is positioned axially relative to the housing 10, sealing the opening of the housing 10 from that side. The housing 10 is positioned axially further away from the end cap 20 on the other side (…). Figure 1 The first space S1 of the built-in stator 2 and rotor 3 is divided at the position on the right side of the figure.

[0027] A driven device is disposed on the axial side relative to the end cover 20. That is, the driven device can also be described as being arranged axially parallel to the motor 1, or as being disposed on the opening side of the housing 10 relative to the motor 1. The driven device is, for example, an electric window device driven by the motor 1, which is mounted in a vehicle. The driven device has an actuator (not shown) that operates by the rotational driving force of the shaft 4, and has a housing 30 that divides a second space S2 to house the actuator. The second space S2 is arranged axially parallel to the first space S1 across the end cover 20.

[0028] It should be noted that, in Figure 1 The diagram only shows the fixed portion 31 of the housing 30 of the driven device, which is axially opposed to the end cover 20 when the driven device and motor 1 are assembled. In other words, in Figure 1 The diagram omits the portion of the housing 30 other than the fixed face 31, but the housing 30 divides the second space S2 by the fixed face 31 and the unshown portion.

[0029] The sealing structure described in this embodiment is applied to the motor 1 as a structure that seals both the first space S1 and the second space S2, which are arranged side by side along the axial direction. The outer casing 10 corresponds to the first component described above, and the housing 30 corresponds to the second component described above. The end cover 20 corresponds to the partition member described above, separating the spaces S1 and S2 between the first space S1 and the second space S2.

[0030] The sealing structure includes a first gasket 41 that seals the first space S1 between the housing 10 and the end cover 20, and a second gasket 42 that seals the second space S2 between the housing 30 and the end cover 20. These gaskets 41 and 42 are integrally formed as a single gasket 40 and are mounted on the end cover 20. This sealing structure prevents the ingress of foreign matter or moisture from the external space Sx outside the first space S1 and the second space S2 into the first space S1 and the second space S2. It should be noted that... Figure 1 For convenience, the cross-section of the pad 40 is shown in black.

[0031] Hereinafter, the other of the aforementioned axial directions of shaft 4 will be referred to as the first axial direction C1, and the aforementioned direction will be referred to as the second axial direction C2. Furthermore, the direction orthogonal to the axial direction and away from axis C, and the direction toward axis C, will be referred to as radial. The radial direction away from axis C will be referred to as radial outer, and the direction toward axis C will be referred to as radial inner. The direction orthogonal to the axial direction and surrounding axis C will be referred to as circumferential. In the following description, unless otherwise specified, the driven device and motor 1 will be used in a state where they are assembled.

[0032] Within the first space S1, the stator 2 is configured such that its axis aligns with the axis C of the shaft 4, and is fixed to the housing 10. The rotor 3 is fixed to the shaft 4 with its axis aligning with the axis C of the shaft 4, and is radially opposed to the stator 2 on its radially inner side. As shown in the figure, it is preferable to provide busbars 5 and 6 on the first axial side C1 and the second axial side C2 of the stator 2, respectively.

[0033] Busbars 5 and 6 are conductive components for wiring multiple coils (not shown) disposed on the stator 2, and are, for example, thin annular in shape with an inner diameter and an outer diameter approximately the same as that of the stator 2. It is preferable that a connector 7 is provided protruding from the end face of the busbar 6 disposed on the second axial direction C2 side of the stator 2 towards the second axial direction C2. The connector 7 is connected to a power supply device (not shown) disposed outside the motor 1 (e.g., in the second space S2). The connector 7 extends axially through both the end cover 20 and the fixed face 31, and extends towards the second space S2.

[0034] The motor 1 includes two bearings 8 and 9 that support a shaft 4 fixed radially inward to the rotor 3. The shaft 4 is supported by these two bearings 8 and 9 so that it can rotate relative to the housing 10 and the end cover 20 (rotatable freely). One bearing 8 is, for example, housed in a first housing portion 14 of the housing 10 (described later), and supports the end of the shaft 4 on the first axial direction C1 side. The other bearing 9 is, for example, housed in a second housing portion 24 of the end cover 20 (described later), and supports the portion of the shaft 4 on the second axial direction C2 side.

[0035] For shaft 4, the portion on the first axial direction C1 is housed in the first space S1, and the portion on the second axial direction C2 extends axially through both the second housing portion 24 and the fixed portion 31 and into the second space S2. However, if the shaft member (not shown) of the actuator of the driven device is connected to shaft 4 in the first space S1, shaft 4 may be entirely housed in the first space S1 without penetrating end cover 20 (second housing portion 24).

[0036] The outer casing 10, serving as the first component, defines a first space S1 on the first axial direction C1 side of the end cover 20. In this embodiment, the outer casing 10 is a bottomed cylindrical shape that opens towards the second axial direction C2, and has a bottom 11 and a cylindrical portion 12. The bottom 11 extends in a direction orthogonal to the axial direction with respect to the axis C on the first axial direction C1 side of the outer casing 10. The cylindrical portion 12 extends from the outer periphery of the bottom 11 towards the second axial direction C2, forming a cylindrical shape that surrounds the axis C.

[0037] The outer casing 10 of this embodiment also has an eave 13 extending radially outward from the end of the cylindrical portion 12 on the second axial C2 side. Here, Figure 2 This is a perspective view of motor 1 viewed from the C1 side along the first axis. Figure 3 This is a perspective view of the end cover 20 and the gasket 40 viewed from the C1 side of the first axis. Additionally, Figure 4 This is a top view of motor 1 viewed from the C2 side of the second axis. (Example) Figure 2 As shown, the eaves 13 extends radially outward from the end of the cylindrical portion 12 on the second axial side C2, forming a ring around the axis C. Figure 1 As shown, the outer casing 10 has a hat-shaped axial section due to these parts 11-13.

[0038] For example, such as Figure 2 As shown, the outer casing 10 is a bottomed cylindrical shape having an annular bottom 11 centered on axis C, an eave 13, and a cylindrical portion 12. A first receiving portion 14 for receiving the bearing 8 is preferably provided on the radially inner side of the bottom 11, protruding towards the first axial direction C1 (making the bottom 11 recessed). The outer casing 10 is, for example, made of metal, and the aforementioned portions 11-14 are integrally formed.

[0039] like Figure 1 As shown, the end cover 20, which serves as a partition member, is disposed (clamped) between the outer shell 10 and the housing 30, blocking the opening of the outer shell 10. The end cover 20 extends about the axis C in the parallel arrangement direction of the first space S1 and the second space S2, that is, in the direction orthogonal to the axial direction (i.e., radial and circumferential), and is axially opposed to the fixed surface 31.

[0040] In this embodiment, the end cap 20 has a main face 21, a flange 22, a vertical flange 23, and a second receiving portion 24 (receiving portion). When viewed from the first axis C1 side, as... Figure 2 As shown, the end cap 20 is formed to include the shape and size of the outer shell 10. The end cap 20 is, for example, made of metal, and the aforementioned portions 21 to 24 are integrally formed.

[0041] The main face 21 is the portion that covers the eaves 13 of the outer shell 10 from the second axis C2 side, such as... Figure 3 As shown, it is a ring shape surrounding axis C. The shape of the main face 21 corresponds to that of the eaves 13, and it is preferably a ring shape centered on axis C. For the main face 21, at least its inner diameter is set to be smaller than the inner diameter of the eaves 13, and its outer diameter is set to be equal to or slightly larger than the outer diameter of the eaves 13, and it covers the entire circumferential area of ​​the eaves 13 from the second axis C2 side.

[0042] like Figure 1As shown, in this embodiment, the main surface 21 extends radially outward from the second receiving portion 24 between the eaves 13 and the fixed surface 31, and together with the second receiving portion 24, serves as a partition separating the first space S1 and the second space S2. The main surface 21 is flat and has a first side surface 21f facing the first axial direction C1 and a second side surface 21g facing the second axial direction C2.

[0043] The radially outer portion of the first side surface 21f faces the end face 13f of the eaves 13 of the outer casing 10 facing the second axial direction C2. The second side surface 21g faces the outer surface 31g of the fixed surface 31 facing the first axial direction C1. In the opposing region R where the first side surface 21f and the end face 13f face each other, the first pad 41 is clamped between the main surface 21 and the eaves 13. Furthermore, in the region where the second side surface 21g faces the outer surface 31g, the second pad 42 is clamped between the main surface 21 and the fixed surface 31. It should be noted that in... Figure 3 as well as Figure 4 For convenience, pad 40 is indicated with a light dot. Additionally, in Figure 3 In the middle, for ease of understanding, the area opposite the end face 13f and the first side face 21f is marked with dark dots as the opposing region R.

[0044] On the main face 21, it is preferable to have a connector hole 21h axially passing through at a position offset radially inward from the opposing region R for the connector 7 to pass through. For example... Figure 4 As shown, it is preferable that the connector hole 21h is slightly larger in the radial direction than the radial length of the connector 7 and wider in the circumferential direction than the circumferential length of the connector 7. Therefore, since the connector 7 can be configured with a common end cover 20 relative to the motor 1, which is positioned differently in the circumferential direction from the flange portion 22 of the fixed part of the driven device, it is beneficial to the commonality of the components of the motor 1.

[0045] The flange portion 22 extends radially outward from a portion of the outer periphery of the main surface portion 21 and is axially opposed to the fixed surface portion 31. In this embodiment, the motor 1 and the driven device are assembled by fixing the flange portion 22 to the fixed surface portion 31. It is preferable to provide multiple flange portions 22 on the end cover 20. In this embodiment, three flange portions 22 are provided on the end cover 20. The three flange portions 22 are all of the same shape and are arranged in a manner that is circumferentially separated from each other and is rotationally symmetrical about the axis C.

[0046] The flange portion 22, for example, when viewed axially, has a mountain-shaped shape that protrudes radially outward from a portion of the outer periphery of the main face portion 21, and as... Figure 1As shown, when viewed radially, it is generally flat, having a surface facing the first axial direction C1 and a surface facing the second axial direction C2. A fastening hole 22h is provided axially through the flange portion 22 for a fastening member (not shown) to fasten the flange portion 22 to the fixed surface portion 31. It should be noted that in the flange portion 22, as... Figure 1 as well as Figure 3 As shown, the annular portion forming the fastening hole 22h can also be offset slightly from the portion other than the annular portion toward the second axial direction C2.

[0047] The flange 23 is a portion (erectedly positioned) that extends from the outer periphery of the main face 21, excluding the outer periphery where the flange 22 is provided, and rises toward the first axial direction C1. Figure 2 As shown, the flange 23 is a curved wall extending circumferentially and axially, surrounding the eaves 13 of the outer casing 10 located radially inward from the outer side. It should be noted that, as... Figure 2 as well as Figure 3 As shown, in addition to the outer periphery (another part) of the main face 21, the standing edge 23 should also stand upright from a part of the end edge of the flange 22 (e.g., the part other than the part near the top of the mountain-shaped peak) toward the first axis C1.

[0048] The end cover 20 is provided with the aforementioned flange 23. Figure 3 As shown, it has a shallow disc shape with its depth along the axial direction. In other words, the axial dimension of the end cover 20 is larger than the axial thickness of the main surface 21 due to the flange 23. As a result, the rigidity of the end cover 20 is improved. Therefore, it is possible to suppress the deformation of the end cover 20, which is fixed to the fixed surface 31, caused by vibrations from the driven device side.

[0049] In this embodiment, such as Figure 2 As shown, the housing 10 is fixed relative to the end cover 20 by cutting and riveting the flange 23 toward the eaves 13. In other words, the motor 1 is integrated with the housing 10 by fixing it relative to the end cover 20 using cutting and riveting, and is assembled with the driven device by fixing the flange 22 and the fixed surface 31 of the end cover 20.

[0050] In this way, the housing 10 is not directly fixed to the fixed surface 31, but is fixed via the end cover 20, thereby suppressing the deformation of the housing 10 caused by vibration from the driven device side. In addition, since no holes or flanges for fixing to the end cover 20 are provided on the side of the housing 10 that is fixed by cutting and riveting, the stress concentration generated in the housing 10 is mitigated.

[0051] Furthermore, regarding the housing 10, since the eaves 13, which is fixed by cutting and riveting via the flange 23, is annular, its circumferential position relative to the end cover 20 can be freely changed (rotated) before it is fixed to the end cover 20. Therefore, without redesigning the housing 10 or the components 2-9 built into it, the relative circumferential position of the aforementioned components (e.g., connector 7) relative to the flange 22 of the end cover 20 can be freely set according to the specifications of the driven device side. This facilitates the commonality of components of the motor 1.

[0052] The eaves 13 of the outer casing 10 is preferably cut and riveted intermittently at multiple locations in the circumferential direction via the flanges 23, as shown in the figure. This disperses the stress applied to the eaves 13, thus mitigating stress concentration in the outer casing 10. The amount of elevation of the flanges 23 relative to the main surface 21 is set to be greater than the axial thickness of the eaves 13.

[0053] like Figure 1 As shown, the second receiving portion 24 is formed on the radially inner side of the end cover 20 and is the portion that receives the bearing 9. In this embodiment, as... Figure 3 As shown, the second receiving portion 24 is a bottomed cylindrical shape arranged such that the radially inner portion of the main face 21 protrudes towards the second axial direction C2 (making the main face 21 recessed). A shaft hole 24h for the shaft 4 to pass through is provided axially at the bottom of the second receiving portion 24. Figure 1 As shown, the second receiving portion 24 is preferably configured to extend axially through the fixed portion 31 together with the shaft 4. However, the second receiving portion 24 may be configured to partially receive the bearing 9 radially inside the end cover 20, or it may not be recessed into the main portion 21. In this case, the second receiving portion 24 may not extend axially through the fixed portion 31.

[0054] The fixed portion 31 of the housing 30, which serves as the second component, has an outer surface 31g that is axially opposed to the end cover 20 and extends in a direction orthogonal to the axial direction. As shown, the fixed portion 31 may have holes axially provided for the shaft 4, the second receiving portion 24, the connector 7, and the fastening member passing through the flange portion 22, respectively. It should be noted that instead of providing holes for the fastening member to pass through the fixed portion 31, a fastening member (e.g., a double-ended bolt) may be provided protruding from the outer surface 31g.

[0055] Finally, also refer to Figures 5-7 The gasket 40 is described below. Figure 5 as well as Figure 6 Partial axial sectional views of end cap 20 and gasket 40 (corresponding to respectively) Figure 4 (The sectional view of XX and YY). Figure 7This is a perspective view of the gasket 40 when viewed from the C1 side of the first axis.

[0056] As described above, the first gasket 41 seals the first space S1 between the housing 10 and the end cap 20. Figure 3 As shown, the first pad portion 41, in the radially outer opposing region R of the main surface portion 21 of the end cover 20, which is located beyond the connector hole 21h, forms a ring surrounding the axis C. Thus, as... Figure 1 As shown, the first padding portion 41 is compressed and deformed between the main face portion 21 and the eaves portion 13 in the entire circumferential region, and presses against both the first side face 21f and the end face 13f. As a result, the first space S1 is sealed, and the intrusion of foreign matter or moisture from the external space Sx into the first space S1 is prevented.

[0057] For example, such as Figure 3 As shown, the first pad portion 41 can be annular about axis C. Additionally, as... Figure 5 As shown, in the unfixed state where the outer casing 10 and the end cover 20 are not fixed, the axial cross-sectional shape of the first pad portion 41 is preferably a semi-circular shape bulging from the first side surface 21f toward the first axial direction C1. Hereinafter, the radial central position (i.e., the position of the apex of the semi-circle) in the first pad portion 41 will be referred to as the first position P1.

[0058] As described above, the second gasket 42 seals the second space S2 between the end cap 20 and the housing 30. Figure 4 As shown, the second pad portion 42, located radially outward from the connector hole 21h in the main surface portion 21 of the end cover 20, forms an annular shape surrounding the axis C. Thus, as... Figure 1 As shown, the second pad 42 is compressed and deformed between the main face 21 and the fixed face 31 in the entire circumferential region, and presses against both the second side surface 21g and the outer surface 31g. As a result, the second space S2 is sealed, and the intrusion of foreign matter or moisture from the external space Sx into the second space S2 is prevented.

[0059] For example, such as Figure 4 As shown, the second pad portion 42 is preferably annular, centered on axis C. Additionally, as... Figure 6 As shown, in the unassembled state where the end cap 20 and the fixed face 31 are not assembled, the axial cross-sectional shape of the second pad portion 42 is preferably an upper semi-circular arch (a shape composed of a combination of a rectangle and a semi-circle) bulging from the second side surface 21g toward the second axial direction C2. However, if the pad 40 is not provided with the protruding edge portion 44 or the connecting portion 46 described later, the second pad portion 42 may also be a semi-circular cross-section like the first pad portion 41. Hereinafter, the radially central position of the second pad portion 42 (i.e., the position of the apex of the semi-circle of the upper semi-circular arch) will be referred to as the second position P2.

[0060] In this sealing structure, as described above, the first gasket portion 41 and the second gasket portion 42 are integrally formed into a gasket 40. That is, the gasket portions 41 and 42 that seal the two spaces S1 and S2 arranged side by side along the axial direction are not formed as independent parts (components), but are integrally formed to constitute a gasket 40.

[0061] This suppresses the increase in the number of components involved in sealing the two spaces S1 and S2 arranged side by side along the axial direction, and achieves a seal (waterproof on both sides) for the two spaces S1 and S2. Furthermore, the integration of the first gasket 41 and the second gasket 42 also helps to fix the end cover 20 to the housing 10 and to reduce the time spent on the work involved in assembling the driven device and the motor 1.

[0062] In addition, such as Figure 3 As shown, the pad 40, which has a first pad portion 41 and a second pad portion 42, is mounted on the end cover 20 in an unassembled and non-fixed state. As a result, the end cover 20 and the pad 40 can be treated as a single component, which helps to reduce the time required for the aforementioned fixing or assembly operations and to reduce the complexity of the operations.

[0063] like Figure 7 As shown, the gasket 40 of this embodiment, in addition to having a first gasket portion 41 and a second gasket portion 42, also has a connecting portion 43, a protruding edge portion 44, an anchoring portion 45, and a connecting portion 46. The gasket 40 is installed on the end cover 20 by forming the above-mentioned portions 41 to 46 integrally with the end cover 20 through external molding. The gasket 40 is formed, for example, from resin or rubber.

[0064] As described above, the first pad portion 41 and the second pad portion 42 are in the shape of an annulus surrounding the same axis C. Therefore, the pad 40 having the above-mentioned portions 41 and 42 is also in the shape of an annulus surrounding the axis C. In this embodiment, the shape of the pad 40 corresponds to that of the first pad portion 41 and the second pad portion 42, and is in the shape of an annulus centered on the axis C.

[0065] The connecting part 43 is the part that connects the first pad part 41 and the second pad part 42 in the axial direction, such as Figure 6 As shown, it is provided through the main surface 21 of the end cover 20. In this way, the first pad portion 41 and the second pad portion 42 are connected through the connecting portion 43 of the end cover 20, thereby realizing the integration of the first pad portion 41 and the second pad portion 42 and the installation of the pad 40 relative to the end cover 20.

[0066] When the first pad portion 41 and the second pad portion 42 are connected by the connecting portion 43, the first pad portion 41 and the second pad portion 42 are preferably arranged to be radially offset from each other. In other words, the first pad portion 41, the connecting portion 43, and the second pad portion 42 are preferably arranged in the same radial position in this order and connected axially. In this embodiment, the radial position of the second pad portion 42, i.e., the second position P2, is offset radially inward relative to the radial position of the first pad portion 41, i.e., the first position P1.

[0067] Here, it is known that the resin or rubber forming the gasket 40 can seal (packing) the elastic deformation region without plastic deformation when the flattening ratio of its length (here, the axial length) relative to the length without external force is within a specified range (e.g., 50-70%). Therefore, when the first gasket portion 41, the connecting portion 43, and the second gasket portion 42 are arranged axially connected at the same position in the radial direction, the flattening ratio of the gasket 40 near the connecting portion 43 differs from the flattening ratio of the first gasket portion 41 and the second gasket portion 42 at other locations, making it difficult to seal the first space S1 and the second space S2 uniformly in the circumferential direction.

[0068] In contrast, in this embodiment, the first position P1 of the first pad 41 and the second position P2 of the second pad 42 are radially offset. This suppresses the difference in the proportion of flattening of the pads 41 and 42 between the area near the connecting portion 43 and other locations. Consequently, the first space S1 and the second space S2 can be sealed more appropriately.

[0069] It is preferable to provide multiple connecting parts 43 on the gasket 40. For example... Figure 7 As shown, the pad 40 in this embodiment is provided with six connecting portions 43. All six connecting portions 43 are of the same shape and preferably arranged at equal intervals in a circumferentially separated manner. For example, as... Figure 6 As shown, each connecting portion 43 is connected to the second axial C2 side of the first pad portion 41 and is connected to the radially outer portion of the protruding edge portion 44 and the second pad portion 42.

[0070] like Figure 4 as well as Figure 6 As shown, a first through hole 21i for forming a connecting portion 43 is provided axially on the main surface 21 of the end cover 20. On the main surface 21, six first through holes 21i are preferably provided at equal intervals in a radial position that overlaps with the first pad portion 41 in the axial direction and are separated in the circumferential direction, corresponding to the number and arrangement of the connecting portions 43.

[0071] The protruding edge 44 is a portion of the end cover 20 that extends radially outward from the second pad portion 42 on the second axial C2 side and connects the second pad portion 42 to the connecting portion 43. The protruding edge 44 is preferably annular, extending radially outward from the second pad portion 42 over the entire circumferential area. However, since the protruding edge 44 connects the second pad portion 42 to the connecting portion 43, it may also be provided only around the connecting portion 43. Figure 5 As shown, the axial length of the protruding edge 44 is set to be at least less than the axial length of the second pad portion 42 in the unassembled state.

[0072] The anchoring part 45 is the part that serves as an anchor for engaging with the end cover 20, and it is provided through the main surface 21 of the end cover 20. For example, as Figure 7 As shown, the anchoring part 45 is a stepped cylindrical part with a diameter on the first axial side C1 that is larger than the diameter on the second axial side C2.

[0073] Anchoring part 45 is preferably as follows Figure 5 As shown, the anchoring portion 45 is positioned radially offset from both the first position P1 of the first pad portion 41 and the second position P2 of the second pad portion 42. Hereinafter, the radially central position of the anchoring portion 45 will be referred to as the anchoring position Pa. As shown, in this embodiment, the anchoring portion 45 is positioned radially inward of the second pad portion 42 and is connected to the second pad portion 42 (one of the first pad portion 41 and the second pad portion 42) via the connecting portion 46. That is, the anchoring position Pa is set radially inward of both the first position P1 and the second position P2.

[0074] It is preferable to provide multiple anchoring parts 45 in the gasket 40. For example... Figure 7 As shown, the pad 40 in this embodiment is provided with three anchoring portions 45. All three anchoring portions 45 are of the same shape and are arranged at equal intervals, separated from each other in the circumferential direction. It is preferable that the three anchoring portions 45 are arranged, for example, to separate the six connecting portions 43 in pairs.

[0075] like Figure 4 as well as Figure 5 As shown, a second through hole 21j for forming an anchoring portion 45 is provided axially through the main surface area 21 of the end cap 20. On the main surface area 21, three second through holes 21j are provided at equal intervals in a circumferentially separated manner, corresponding to the number and arrangement of the anchoring portions 45. Figure 5 As shown, each of the second through holes 21j and the anchoring part 45 has a stepped shape in which the diameter of the portion on the first axial C1 side is larger than the diameter of the portion on the second axial C2 side.

[0076] Since the second through hole 21j is a hole for forming the anchoring portion 45, the aforementioned anchoring position Pa can also be described as the radial position of the second through hole 21j. The anchoring portion 45 is provided in the second through hole 21j, so its portion on the first axial direction C1 side engages with the portion on the first axial direction C1 side of the second through hole 21j. Therefore, the gasket 40 is prevented from falling off the end cap 20. In this embodiment, the second through hole 21j serves as a gate during external molding.

[0077] The connecting portion 46 is the part on the second axial C2 side of the end cover 20 where the second pad portion 42 is connected to the anchor portion 45. For example, as... Figure 7 As shown, the connecting portion 46 extends in a direction orthogonal to the axial direction on the second axial C2 side of the anchoring portion 45, centered on the anchoring portion 45, and is preferably connected to a portion of the radially inner edge of the second pad portion 42. However, since the connecting portion 46 is the part that connects the second pad portion 42 to the anchoring portion 45, it can be provided to extend radially inward from the entire area of ​​the radially inner edge of the second pad portion 42, similar to the protruding edge 44. Figure 5 As shown, the axial length of the connecting portion 46 is set to be at least less than the axial length of the second pad portion 42 in the unassembled state.

[0078] During the external molding process, the rubber or resin (hereinafter referred to as "molten material") supplied to the second through hole 21j, which serves as the gate, is as follows: Figure 5 As indicated by the middle arrow A1, the material flows toward the second axial direction C2 within the second through hole 21j. Subsequently, the molten material flows as shown in the image. Figure 5 As indicated by arrows A2 and A3, the material flows radially outward to fill the space, forming the second padding portion 42 or the protruding edge 44. Additionally, the molten material flowing radially outward within the aforementioned space... Figure 6 As indicated by the middle arrow A4, the flow moves toward the first axial direction C1 within the first through hole 21i, filling the space formed between the end cover 20 and a chamber (not shown) disposed on its first axial direction C1 side in such a way as forming a first padding portion 41. Thus, the end cover 20 and the portions 41-46 forming the padding 40 are integrally provided.

[0079] Here, the region located directly downstream of the gate (second through hole 21j) in the flow direction of the molten material described above (i.e. Figure 5In the area indicated by arrow A1, the molten material is prone to expansion or depression due to thermal contraction. In this embodiment, both the first gasket portion 41 and the second gasket portion 42 are formed at a position offset radially from the second through hole 21j. That is, both the first gasket portion 41 and the second gasket portion 42 are formed in a region offset from the aforementioned region, thus improving the forming accuracy of the first gasket portion 41 and the second gasket portion 42. As a result, the first space S1 and the second space S2 can be sealed more appropriately using the first gasket portion 41 and the second gasket portion 42. In other words, in this embodiment, a connecting portion 46 that does not contribute to the sealing of the first space S1 and the second space S2 is formed in the aforementioned region, thus improving the sealing accuracy of the sealing structure.

[0080] [2. Functions and Effects]

[0081] (1) In the above-described sealing structure, the first gasket 41 sealing the first space S1 and the gasket 42 sealing the second space S2 are integrally formed as a gasket 40 and mounted on the end cover 20. This suppresses the increase in the number of components involved in sealing the two spaces S1 and S2 arranged side-by-side along the axial direction, and seals both spaces S1 and S2. Furthermore, since the end cover 20 and the gasket 40 mounted on it can be treated as a single component, the time required for fixing the end cover 20 to the housing 10 and assembling the driven device and motor 1 can be reduced, and the complexity of these operations is suppressed.

[0082] (2) In the sealing structure described above, the gasket 40 is integrally formed with the end cover 20 by external molding. As a result, the first gasket portion 41 and the second gasket portion 42, which are formed as a single unit, can be easily formed by external molding, thereby reducing manufacturing costs. In addition, since the integration of the first gasket portion 41 and the second gasket portion 42 and the mounting of the gasket 40 relative to the end cover 20 can be achieved simultaneously, it helps to reduce manufacturing time.

[0083] (3) When the first gasket 41 and the second gasket 42 are connected by the connecting portion 43 provided through the first through hole 21i of the end cover 20, the misalignment of the first gasket 41 and the second gasket 42 relative to the end cover 20 can be suppressed by the connecting portion 43. This helps to achieve a more stable seal for the first space S1 and the second space S2.

[0084] Furthermore, during the external molding process, the first through hole 21i can be utilized as a hole for allowing molten material to flow from the first axial direction C1 to the second axial direction C2 or vice versa, thereby enabling the first pad portion 41 and the second pad portion 42 to be formed in one step. This improves the ease of molding the first pad portion 41 and the second pad portion 42.

[0085] (4) When the first gasket 41 and the second gasket 42 are connected by the connecting part 43, if the first gasket 41 and the second gasket 42 are set to be radially offset from each other, the deviation in the ratio of the flattening amount of the first gasket 41 and the second gasket 42 in the circumferential direction can be suppressed. This further contributes to a more stable seal of the first space S1 and the second space S2.

[0086] (5) When the anchoring portion 45, which engages with the second through hole 21j provided in the end cover 20, is provided on the gasket 40, the anchoring portion 45 can suppress the offset of the mounting position of the first gasket portion 41 and the second gasket portion 42 relative to the end cover 20. Furthermore, when both the first gasket portion 41 and the second gasket portion 42 are positioned at locations that are radially offset from the second through hole 21j, which becomes a gate during external molding, the molding accuracy of both the first gasket portion 41 and the second gasket portion 42 can be improved. This, in turn, contributes to a more stable seal in the first space S1 and the second space S2.

[0087] (6) In the motor 1 described above, the end cover 20 having the second receiving portion 24 is used as a partition member of the sealing structure described above. In this way, the end cover 20, which has the function of holding the bearing 9, has the function of sealing both the first space S1 and the second space S2, thereby enabling the reduction of the number of components or the improvement of the ease of component handling. In addition, the first liner portion 41 and the second liner portion 42 can prevent foreign matter from entering the space inside and outside the motor 1 around the bearing 9 from the external space Sx, thereby suppressing the deterioration of the bearing 9 caused by such foreign matter.

[0088] (7) In the motor 1 described above, the end cover 20 has a main surface 21, a flange portion 22, and a vertical flange portion 23. The motor 1 is assembled with the driven device via the flange portion 22 of the end cover 20, and the housing 10 is fixed to the end cover 20 by cutting and riveting. This improves the rigidity of the end cover 20 and reduces stress concentration in the housing 10. Furthermore, it is possible to achieve commonality between the housing 10, which is fixed to the end cover 20 by cutting and riveting, and the components 2 to 9 built into the housing 10.

[0089] [3. Other]

[0090] The sealing structure and motor 1 described above are examples, and are not limited to the structures described above. The motor 1 using the above-described sealing structure may not be an internal rotor type brushless motor; it may also be an external rotor type brushless motor. Motor 1 may also be a brushed motor. It should be noted that the device (object of application) using the sealing structure may not be a motor.

[0091] The housing 10 can also be fixed to the end cover 20 without cutting or riveting. Alternatively, the motor 1 can be assembled with the driven device by fixing the housing 10 to the fixed surface 31. In this case, the flange 22 and the vertical flange 23 of the end cover 20 can be omitted. Additionally, the eaves 13 of the housing 10 can also be omitted. The shapes of the housing 10 and the end cover 20 are examples and are not limited to the shapes described above.

[0092] The first pad portion 41 and the second pad portion 42 can be integrated into a single pad 40 and mounted on the end cover 20. The connecting portion 43, the protruding edge portion 44, the anchoring portion 45, and the connecting portion 46 of the pad 40 can be omitted. The first pad portion 41 and the second pad portion 42 can also be integrated by connecting on the radially inner or radially outer side of the end cover 20. The pad 40 can also be formed without external molding.

[0093] Explanation of reference numerals in the attached figures

[0094] 1. Motor

[0095] 2. Stator

[0096] 3 rotors

[0097] 4-axis

[0098] 9 bearings

[0099] 10. Outer shell

[0100] 13. Eaves

[0101] 20 end caps

[0102] 21 Main Face

[0103] 21i First Through Hole

[0104] 21j Second Through Hole

[0105] 22 Flange portion

[0106] 23. Liyuan Section

[0107] 24. Second Containment Department (Containment Department)

[0108] 30 Casing

[0109] 40 Padding

[0110] 41 First Pad Section

[0111] 42 Second Pad Section

[0112] 43 Connecting parts

[0113] 45 Anchorage section

[0114] 46 Connecting parts

[0115] C-axis

[0116] C1 First Axial Direction

[0117] C2 Second Axial

[0118] P1 First position (the radial position of the first padding part)

[0119] P2 Second position (the radial position of the second padding part)

[0120] Pa Anchorage position (the radial position of the second through hole)

[0121] S1 First Space

[0122] S2 Second Space.

Claims

1. A sealing structure, characterized in that, The sealing structure includes: A partition component that separates the first space from the second space between two spaces arranged side by side; The first component divides the first space; The second component divides the second space; A first liner portion that seals the first space between the first member and the partition member; as well as The second liner seals the second space between the second member and the partition member. The first pad portion and the second pad portion are formed integrally as a single pad and are mounted on the partition member. The gasket is integrally formed with the partition member by external molding and is in the shape of an annulus surrounding the axis extending along the parallel arrangement direction of the first space and the second space. In the partition member, a second through hole is provided at a radial position offset from the respective positions of the first and second pads in a direction centered on the axis, extending along the parallel arrangement direction. The liner is provided with an anchoring portion that engages with the second through hole, and a connecting portion that connects the anchoring portion to one of the first liner portion and the second liner portion in the radial direction.

2. The sealing structure according to claim 1, characterized in that, The partition wall component is provided with a first through hole extending along the parallel arrangement direction. The first pad portion and the second pad portion are connected by a connecting portion that passes through the first through hole.

3. The sealing structure according to claim 2, characterized in that, The first pad portion and the second pad portion are configured to be offset from each other in the radial direction.

4. A motor, characterized in that, The motor has the following features: It has a bottomed, cylindrical outer shell; The rotor and stator are built into the housing; A shaft that rotates integrally with the rotor; The shaft is supported by a freely rotating bearing; as well as An end cover that seals the opening of the outer casing and is positioned opposite the housing of the driven device disposed on the side of the opening relative to the outer casing. The end cover has a receiving portion that houses the bearing on its inner side in the radial direction centered on the axis of the shaft. The sealing structure according to any one of claims 1 to 3 is applied to the end cap as the partition member, the outer shell as the first member, and the housing as the second member.

5. The motor according to claim 4, characterized in that, The outer casing has an annular rim extending outward in the radial direction from the opening side. The end cap has an annular main face that covers the eaves from the opening side, a flange that extends radially outward from a portion of the outer periphery of the main face and is fixed to the housing, and a flange that rises toward the housing side from another portion of the outer periphery of the main face, excluding the aforementioned portion. The outer casing is fixed relative to the end cover by cutting and riveting the flange toward the eaves.

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