WO2021095344A1 - Motor and electrical equipment including same - Google Patents

Motor and electrical equipment including same Download PDF

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Publication number
WO2021095344A1
WO2021095344A1 PCT/JP2020/034410 JP2020034410W WO2021095344A1 WO 2021095344 A1 WO2021095344 A1 WO 2021095344A1 JP 2020034410 W JP2020034410 W JP 2020034410W WO 2021095344 A1 WO2021095344 A1 WO 2021095344A1
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WO
WIPO (PCT)
Prior art keywords
frame
end plate
lip
motor
seal ring
Prior art date
Application number
PCT/JP2020/034410
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French (fr)
Japanese (ja)
Inventor
貴紀 荻原
祥太 飯塚
保治 内田
水上　裕文
Original Assignee
パナソニックＩｐマネジメント株式会社
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2021095344A1 publication Critical patent/WO2021095344A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers

Definitions

  • the present invention relates to a motor and an electric device including the motor.
  • the present invention particularly relates to a motor having a structure for preventing the ingress of moisture, oil, etc. from the outside.
  • motors have been widely used for electrical equipment, power tools, etc., or for in-vehicle applications.
  • a small motor is used to drive a hydraulic pump used in an anti-lock braking system (ABS, Anti-lock Break System).
  • ABS Anti-lock Break System
  • Motors used in these applications are required to have higher reliability while being further required to be smaller and lighter.
  • the motor used for ABS is located in the engine compartment of the vehicle. For this reason, moisture from the outside may be applied to the motor in rainy weather, etc., and it is necessary to take sufficient waterproof measures.
  • the above-mentioned moisture etc. mainly enters the inside of the frame from the connecting portion between the end plate and the frame. Therefore, a seal ring such as an O-ring and an X-ring is provided at this connecting portion to prevent moisture or the like from entering the frame.
  • a seal ring such as an O-ring and an X-ring is provided at this connecting portion to prevent moisture or the like from entering the frame.
  • An object of the present invention is to provide a highly reliable motor that maintains the airtightness of a connecting portion between an end plate and a frame, and an electric device using the same.
  • the motor according to the present invention includes a bottomed tubular frame having one end opened, a stator housed in the frame, and a stator housed in the frame.
  • Rotors arranged at intervals, an end plate which is a plate-like member arranged so as to cover the opening in the opening of the frame and having a through hole through which the rotation shaft is inserted, and an annular elasticity. It consists of a body and is equipped with at least a seal ring for maintaining the airtightness inside the frame, and an annular open space is formed between the step formed on the outer peripheral surface of the outer surface of the end plate and the inner peripheral surface of the frame.
  • the seal ring is housed in an open space, the seal ring has an X-shaped cross section and has first to fourth lips, and the fourth lip is in contact with the corner of the step, and the first -At least one of the third lip has a larger cross-sectional area than the fourth lip.
  • the contact pressure of the seal ring at the corner of the open space including the inner peripheral surface of the frame can be increased.
  • the contact pressure of the seal ring at the corner portion formed by this load and the inner peripheral surface of the frame can be increased.
  • the electric device is a load having a motor, a driven portion connected to the motor, driven to a rotating shaft protruding from a through hole on the outside of the end plate, and driven in response to the rotation of the motor.
  • the first lip is formed at the first corner portion formed by the bottom surface of the step and the inner peripheral surface of the frame.
  • the second lip is on the second corner composed of the surface of the load and the inner peripheral surface of the frame
  • the third lip is on the third corner composed of the surface of the load and the side surface of the step
  • the fourth lip is on the step. It is in contact with the fourth corner portion, which is the corner portion of the above.
  • the first to third lips are in predetermined contact with the first to third corners, which correspond to the entry path of moisture from the outside. Contact with surface pressure. Therefore, it is possible to reliably prevent the ingress of moisture or the like into the inside of the frame or the inside of the load. As a result, highly reliable electrical equipment can be realized.
  • FIG. 1 is a schematic cross-sectional view of a main part of an electric device according to a first embodiment of the present invention.
  • FIG. 2 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring for comparison.
  • FIG. 3 is a schematic cross-sectional view of the seal ring.
  • FIG. 4A is a schematic cross-sectional view of a connecting portion between the end plate and the frame before assembling the electrical equipment.
  • FIG. 4B is a schematic cross-sectional view of a connecting portion between the end plate and the frame after assembling the electrical equipment.
  • FIG. 5 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the first embodiment.
  • FIG. 6 is a schematic cross-sectional view of the seal ring according to the first modification.
  • FIG. 7 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the first modification.
  • FIG. 8 is a schematic cross-sectional view of another seal ring according to the first modification.
  • FIG. 9 is a schematic cross-sectional view of another connecting portion between the end plate and the frame according to the first modification.
  • FIG. 10A is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention.
  • FIG. 10B is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention.
  • FIG. 11 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the second embodiment of the present invention.
  • FIG. 12 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second modification.
  • FIG. 13 is another schematic cross-sectional view of the connecting portion between the end plate and the frame according to the second modification.
  • FIG. 1 is a schematic cross-sectional view of a main part of an electric device according to a first embodiment of the present invention.
  • the motor 100 includes a frame 20, an end plate 30, bearings 40 and 41, a rotor 50, a stator 60, a brush 70, and a seal ring 80.
  • the electric device 300 includes a load 200 and a motor 100.
  • the longitudinal direction of the rotating shaft 54 forming a part of the rotor 50 is referred to as an axial direction
  • the radial direction of the end plate 30 is referred to as a radial direction
  • the circumferential direction of the end plate 30 is referred to as a circumferential direction. I may call it.
  • the side of the frame 20 on which the end plate 30 is arranged may be referred to as "upper", and the opposite side of the frame 20 may be referred to as "lower".
  • the details of the load 200 are not shown.
  • the frame 20 is a bottomed semi-cylindrical metal member having a collar around an opening 21 provided at the top.
  • a bearing holding portion 22 inserted into one end of the rotating shaft 54 is formed on the bottom surface of the frame 20.
  • a plurality of plate support portions 24 (see FIGS. 4A to 9) that abut and support the inner surface of the end plate 30 are arranged on the upper side of the inner peripheral surface 23 of the frame 20 at intervals in the circumferential direction. ing.
  • an annular flange 25 bent outward in the radial direction is formed at the upper end of the frame 20, that is, in the vicinity of the opening 21.
  • the end plate 30 is a plate-shaped member formed by molding a resin material.
  • the end plate 30 is formed on a substantially disk-shaped base portion 31, a through hole 32 provided in the center of the base portion 31, a brush holding portion 33 formed on the inner surface of the base portion 31, and an outer surface of the base portion 31.
  • the electric wire drawn from the electric wire outlet is not shown for convenience of explanation.
  • the surface of the end plate 30 facing the inside of the frame 20 is referred to as the “inner surface” of the end plate 30, and the surface of the end plate 30 opposite to the inner surface is referred to as the “outer surface” of the end plate 30.
  • the end plate 30 is press-fitted into the opening 21 of the frame 20 after being positioned with the frame 20.
  • the inner surface of the end plate 30 is in contact with the plate support portion 24 provided on the frame 20.
  • the end plate 30 is arranged in the frame 20 so as to cover the opening 21.
  • the rotor 50 is housed in a space partitioned by the frame 20 and the end plate 30.
  • the rotating shaft 54 is inserted through the through hole 32 of the end plate 30 and projects outward from the end plate 30.
  • the rotating shaft 54 is rotatably supported by a bearing 40 held by the bearing holding portion 22 of the frame 20 and a bearing 41 provided so as to close the through hole 32.
  • a step 36 is formed on the outer peripheral portion of the outer surface of the end plate 30 (see FIG. 2).
  • the bottom surface 38 of the step 36 is a flat surface.
  • the bottom surface 38 is formed so as to be orthogonal to the side surface 37 of the step 36.
  • “Orthogonal” means “orthogonal” including the processing tolerance of the step 36, and does not mean that the two to be compared are strictly orthogonal to each other.
  • the rotor 50 has an armature core 51, a plurality of salient poles 52, an armature winding 53, a rotating shaft 54, a commutator 55, and an insulator 56.
  • a plurality of salient poles 52 projecting outward in the radial direction are arranged on the armature core 51 at predetermined intervals in the circumferential direction.
  • An armature winding 53 is wound around the armature core 51 via an insulator 56, which is an insulating resin, around each of the plurality of salient poles 52.
  • the commutator 55 is connected to the leader wire of the armature winding 53 drawn from the armature core 51.
  • the rotating shaft 54 is provided at the axis of the rotor 50, penetrates the center of the armature core 51 and the commutator 55, and is connected to them.
  • the stator 60 is composed of a frame 20 and a plurality of permanent magnets 61 arranged on the inner peripheral surface 23 of the frame 20 at predetermined intervals in the circumferential direction.
  • the permanent magnets 61 adjacent to each other in the circumferential direction are arranged so as to have different polarities from each other.
  • the frame 20 also functions as a yoke constituting the permanent magnet 61 and the magnetic circuit.
  • the pair of brushes 70 contains a solid lubricant in a carbon brush material such as graphite.
  • the pair of brushes 70 are held in the brush holding portion 33 provided on the inner surface of the end plate 30.
  • the pair of brushes 70 are pressed against the commutator 55 by a brush spring (not shown).
  • the seal ring 80 is made of an annular elastic body, for example, EPDM (ethylene propylene diene rubber, Ethylene Propyrene Diene Monomer Rubber), nitrile rubber, fluororubber, or the like.
  • EPDM ethylene propylene diene rubber, Ethylene Propyrene Diene Monomer Rubber
  • the seal ring 80 has an X-shaped cross section and has four lips 80a to 80d. The shape of the seal ring 80 will be described in detail later.
  • the seal ring 80 is housed in an annular open space S partitioned between the above-mentioned step 36 and the inner peripheral surface 23 of the frame 20 facing the side surface 37 of the step 36.
  • the seal ring 80 seals the connecting portion between the frame 20 and the end plate 30 to prevent moisture and the like from entering the inside of the frame 20 from the outside.
  • the annular open space S is an open space whose upper part is open.
  • the load 200 is arranged on the upper side of the motor 100.
  • the driven portion 210 is drive-connected to the rotating shaft 54 protruding from the through hole 32 on the outside of the end plate 30.
  • the driven unit 210 includes a mechanical element (not shown) that rotates in the same direction or in the opposite direction according to the rotation of the rotating shaft 54, or converts the rotational motion into a linear motion.
  • the load 200 is, for example, a hydraulic pump. However, it is not limited to this.
  • the outer shell 220 of the load 200 is assembled to the motor 100 with its surface 221 in contact with the frame 20 and the second and third lips 80b and 80c of the seal ring 80.
  • the motor 100 and the load 200 are arranged so that the surface 221 of the outer shell 220 and the outer surface of the end plate 30 are separated from each other while maintaining a predetermined clearance.
  • the outer shell 220 is, for example, a block made of aluminum. However, it is not limited to this. Further, in the following description, the surface 221 of the outer shell 220 may be referred to as the surface 221 of the load 200.
  • the seal ring 80 When pressed from the surface 221 of the load 200 to the lower side, that is, to the bottom side of the frame 20, the seal ring 80 is compressed and deformed, and the four lips 80a to 80d are formed into an annular open space S and the surface of the load 200. It is in contact with four corner portions C1 to C4 (see FIGS. 2 to 4B) of the space partitioned by 221.
  • the first lip 80a is in contact with the first corner portion C1 composed of the bottom surface 38 of the step 36 formed on the end plate 30 and the inner peripheral surface 23 of the frame 20.
  • the second lip 80b is in contact with the second corner portion C2 composed of the inner peripheral surface 23 of the frame 20 and the surface 221 of the load 200.
  • a flange 25 bent outward in the radial direction is formed at the upper end of the frame 20. Therefore, in the second corner portion C2, the second lip 80b may not sufficiently contact the inner peripheral surface 23 of the frame 20, and may mainly contact only the surface 221 of the load 200. ..
  • the third lip 80c is in contact with the third corner portion C3 composed of the surface 221 of the load 200 and the side surface 37 of the step 36.
  • the fourth lip 80d is in contact with the fourth corner portion C4 corresponding to the corner portion of the step 36.
  • the first lip 80a is located diagonally to the third lip 80c in cross-sectional view
  • the second lip 80b is located diagonally to the fourth lip 80d in cross-sectional view.
  • the seal ring 80 comes into contact with the load 200, the frame 20 and the end plate 30, and pressure is applied to the contact surface portion.
  • the space between the frame 20 and the end plate 30 and the space between the frame 20 and the load 200 are sealed. Therefore, it is possible to prevent moisture from the outside from entering the inside of the frame 20 from the load 200 side.
  • By sealing between the end plate 30 and the load 200 it is possible to prevent moisture or the like from adhering to the bearing 41 or the rotating shaft 54.
  • FIG. 2 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring for comparison.
  • components other than the frame 20, the end plate 30, the seal ring 80, and the bearing 41 are not shown.
  • At the load 200 only a part of the outer shell 220 including the surface 221 is shown.
  • FIG. 2 the upper figure shows the state immediately after the motor 100 and the load 200 are assembled.
  • each member maintains the arrangement relationship as designed within the range of the assembly tolerance.
  • pressure is applied from the load 200 side to the motor 100 side.
  • pressure is applied to the central portion of the end plate 30 via the bearing 41 housed in the bearing holding portion 34.
  • pressure is applied from the load 200 side to the central portion of the end plate 30.
  • the temperatures of the motor 100 and the load 200 start to rise due to the driving of the motor 100, the operation of the load 200, the temperature of the environment in which the electric device 300 is arranged, and the like. ..
  • the resin material is deformed by thermal creep. Therefore, the end plate 30 formed by using the resin material is deformed so that the central side is pushed downward and the outer peripheral side is lifted upward accordingly.
  • the contact pressure of the third lip 80c at the third corner C3 and the contact pressure of the fourth lip 80d at the fourth corner C4 also weaken.
  • the first to third corner portions C1 to C3 correspond to the entry route of moisture and the like from the outside.
  • the second corner portion C2 is most likely to allow moisture or the like to enter from the outside.
  • the inventors of the present application have found that the sealing property of the seal ring 80 at the first to third corners C1 to C3 is lowered, and a fluid such as moisture easily enters the inside of the frame 20. It was.
  • the inventors of the present application paid attention to the shape of the seal ring 80.
  • the inventors of the present application have found that the airtightness inside the frame 20 can be maintained by changing the shape as described later.
  • FIG. 3 is a schematic cross-sectional view of the seal ring.
  • FIG. 4A is a schematic cross-sectional view of a connecting portion between the end plate and the frame before assembling the electrical equipment.
  • FIG. 4B is a schematic cross-sectional view of a connecting portion between the end plate and the frame after assembling the electrical equipment.
  • FIG. 5 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the present embodiment.
  • FIG. 4A shows a cross section of a connecting portion between the end plate 30 and the frame 20 before the load 200 is attached.
  • FIG. 4B shows a cross section of a connecting portion between the end plate 30 and the frame 20 after the load 200 is attached.
  • FIGS. 4A, 4B, and 5 cross sections of parts of the load 200, the frame 20, and the end plate 30 are also shown.
  • the three lips 80a to 80c of the seal ring 80 are formed so that the cross-sectional area, in other words, the volume is larger than that of the fourth lip 80d.
  • the seal ring 80 is housed in the annular open space S.
  • the first lip 80a is pressed against the first corner portion C1 and the fourth lip 80d is pressed against the fourth corner portion C4, respectively, and is deformed.
  • the second and third lips 80b and 80c each project above the upper surface of the annular open space S, that is, to the load 200 side by the length A.
  • the surface 221 of the load 200 abuts on the second and third lips 80b and 80c of the seal ring 80, respectively, and presses the seal ring 80 downward.
  • the load 200 further lowers the central portion of the end plate 30 via the bearing 41 housed in the bearing holding portion 34.
  • the first to third lips 80a to 80c are formed so that the cross-sectional area is larger than that of the fourth lip 80d. That is, the contact pressure of the seal ring 80 at the first to third corners C1 to C3 is higher than the contact pressure at the fourth corner C4. Therefore, the decrease in the contact surface pressure of the seal ring 80 at the first to third corner portions C1 to C3 due to thermal creep is offset, and the airtightness at the first to third corner portions C1 to C3 is maintained. This makes it possible to prevent moisture and the like from entering the inside of the frame 20.
  • the fourth corner portion C4 is composed of only the end plate 30, it does not directly contribute to the airtightness between the frame 20 and the end plate 30 and the airtightness between the frame 20 and the load 200. Therefore, even if the contact pressure of the seal ring 80 decreases at the fourth corner portion C4, the influence of moisture or the like entering the inside of the frame 20 is small.
  • the motor 100 has a bottomed tubular frame 20 having one end opened, a stator 60 housed in the frame 20, and a stator housed in the frame 20.
  • a rotor 50 arranged at a predetermined interval from the 60, and an end plate 30 which is a resin plate-like member arranged so as to cover the opening 21 in the opening 21 of the frame 20 are provided.
  • a through hole 32 through which the rotating shaft 54 is inserted is provided in the center of the end plate 30.
  • the motor 100 is made of an annular elastic body, includes a seal ring 80 for maintaining airtightness inside the frame 20, and has a step 36 formed on the outer peripheral portion of the outer surface of the end plate 30 and the inside of the frame 20.
  • An annular open space S is formed between the peripheral surface 23 and the seal ring 80, and the seal ring 80 is housed in the annular open space S.
  • the seal ring 80 has an X-shaped cross section and has four lips 80a to 80d, and the fourth lip 80d is in contact with the corner of the step 36. In other words, the fourth lip 80d is in contact with only the end plate 30.
  • the first to third lips 80a to 80c have a larger cross-sectional area than the fourth lip 80d.
  • the contact pressures of the first to third lips 80a to 80c are increased with respect to the first to third corner portions C1 to C3, which correspond to the entry path of moisture and the like from the outside. Be done. As a result, it is possible to reliably prevent moisture and the like from entering the inside of the frame 20 and the inside of the load 200.
  • the cross section of the seal ring 80 into an X shape, there are two seal rings 80 with respect to the bottom surface 38 of the step 36 which is the installation surface of the seal ring 80.
  • the first lip 80a and the fourth lip 80a and the fourth Since the lip 80d comes into contact with the lip 80d, the position of the seal ring 80 in the annular open space S can be stabilized.
  • the cross-sectional area of the fourth lip 80d smaller than that of the other lips 80a to 80c, it is possible to prevent the volume of the seal ring 80 itself from becoming too large. If the volume of the seal ring 80 becomes too large, the seal ring 80 may be abnormally deformed when the load 200 is attached to the motor 100, and the airtightness may not be maintained. By using the seal ring 80 of the present embodiment, it is possible to avoid the occurrence of such a problem.
  • the electric device 300 is connected to the motor 100 and the motor 100, and is driven and connected to the rotating shaft 54 protruding from the through hole 32 to the outside of the end plate 30, and is driven according to the rotation of the motor 100. It includes at least a load 200 having a driven portion 210 to be driven.
  • the seal ring 80 is pressed from the surface 221 of the load 200 toward the bottom of the frame 20, so that the first lip 80a is a first corner portion formed by the bottom surface 38 of the step 36 and the inner peripheral surface 23 of the frame 20.
  • the second lip 80b is on the second corner portion C2 composed of the surface 221 of the load 200 and the inner peripheral surface 23 of the frame 20
  • the third lip 80c is on the surface 221 of the load 200 and the side surface 37 of the step 36.
  • the fourth lip 80d is in contact with the third corner portion C3 composed of the above, and the fourth lip 80d is in contact with the fourth corner portion C4, which is the corner portion of the step 36.
  • the end plate is caused by the heat continuously generated when the motor 100 is driven and the driven portion 210 of the load 200 is operated and the pressure applied to the end plate 30. Even when the 30 is deformed, it is possible to prevent moisture and the like from entering the inside of the frame 20 and the inside of the load 200. Thereby, a highly reliable electric device 300 can be realized.
  • the cross section of the seal ring 80 X-shaped and making the cross-sectional area of each of the first to third lips 80a to 80c larger than the cross-sectional area of the fourth lip 80d moisture from the outside and the like can be prevented.
  • the contact pressure of the first to third lips 80a to 80c is increased with respect to the first to third corner portions C1 to C3 corresponding to the approach path, and moisture or the like enters the inside of the frame 20 or the load 200, respectively. Can be reliably prevented.
  • the electric device 300 of the present embodiment is useful because it can ensure high reliability when it is arranged in an external environment and is continuously used in a state where the environmental temperature reaches several tens of degrees or more.
  • the motor 100 of the present embodiment includes a bottomed tubular frame 20 having one end opened, a stator 60 housed in the frame 20, and a stator 60 housed in the frame 20.
  • At least a certain end plate 30 and a seal ring 80 made of an annular elastic body and for maintaining airtightness inside the frame 20 are provided.
  • An annular open space S is partitioned between the step 36 formed on the outer peripheral portion of the outer surface of the end plate 30 and the inner peripheral surface 23 of the frame 20, and the seal ring 80 is housed in the open space.
  • the seal ring 80 has an X-shaped cross section and has first to fourth lips 80a to 80d.
  • the fourth lip 80d is in contact with the corner of the step 36.
  • At least one of the first to third lips 80a to 80c has a larger cross-sectional area than the fourth lip 80d.
  • the contact pressure of the seal ring 80 at the corner portion of the open space including the inner peripheral surface 23 of the frame 20 can be increased.
  • the contact pressure of the seal ring 80 at the corner portion formed by the load 200 and the inner peripheral surface 23 of the frame 20 can be increased.
  • the electric device 300 of the present embodiment is connected to the motor 100 and the motor 100, and is driven and connected to the rotating shaft 54 protruding from the through hole 32 to the outside of the end plate 30, and is driven and connected according to the rotation of the motor 100. It includes at least a load 200 having a driven portion 210 to be driven.
  • the seal ring 80 When the seal ring 80 is pressed from the surface of the load 200 toward the bottom of the frame 20, the first lip 80a is placed on the first corner portion formed by the bottom surface 38 of the step and the inner peripheral surface of the frame 20.
  • the 2 lip 80b is the second corner portion composed of the surface of the load 200 and the inner peripheral surface 23 of the frame 20
  • the third lip 80c is the third corner portion composed of the surface of the load 200 and the side surface 37 of the step.
  • the fourth lip 80d is in contact with the fourth corner portion, which is the corner portion of the step 36, respectively.
  • the cross section of the seal ring 80 into an X shape, the first to third lips 80a with respect to the first to third corner portions C1 to C3 which correspond to the entry path of moisture and the like from the outside. -80c come into contact with each other at a predetermined contact pressure. Therefore, it is possible to reliably prevent the ingress of moisture or the like into the inside of the frame 20 or the inside of the load. As a result, a highly reliable electric device 300 can be realized.
  • FIG. 6 is a schematic cross-sectional view of the seal ring according to the first modification.
  • FIG. 7 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the first modification.
  • FIG. 8 is a schematic cross-sectional view of another seal ring according to the first modification.
  • FIG. 9 is a schematic cross-sectional view of another connecting portion between the end plate and the frame according to the first modification.
  • FIGS. 6 to 9 the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the seal ring 81 shown in FIG. 6 is formed so that the cross-sectional areas of the first and second lips 81a and 81b are larger than the cross-sectional areas of the fourth lip 81d, respectively. As described above, the first and second lips 81a and 81b abut on the first and second corner portions C1 and C2, respectively, and the first and second corner portions C1 and C2 touch the inner peripheral surface 23 of the frame 20. Each is included.
  • the gap between the inner peripheral surface 23 of the frame 20 and the surface 221 of the load 200 increases in the second corner portion C2 due to the thermal deformation of the end plate 30. For this reason, it is the second corner portion C2 that is most likely to allow moisture or the like to enter from the outside.
  • the path through which moisture or the like directly enters the inside of the frame 20 is the first corner portion C1. Therefore, it is necessary to improve the airtightness at the first corner portion C1.
  • the contact surface pressure of the seal ring 81 at the first and second corner portions C1 and C2 shown in FIG. 7 can be increased, and the inside of the frame 20 and the inside of the load 200 can be increased. It is possible to reliably prevent the ingress of moisture and the like into the water.
  • the cross-sectional area of the third lip 81c equal to the cross-sectional area of the fourth lip 81d, the volume of the seal ring 81 itself can be reduced, and abnormal deformation of the seal ring 81 can be suppressed. As a result, the airtightness inside the frame 20 and the inside of the load 200 can be improved.
  • the upper end portion of the frame 20 is a flange 25 bent outward in the radial direction. Therefore, if the cross-sectional area of the second lip 81b is simply increased, the second lip 81b may not be able to completely seal the second corner portion C2, and the airtightness at the second corner portion C2 may not be maintained.
  • the cross-sectional area of at least one of the first to third lips 81a to 81c and 82a to 82c may be made larger than the cross-sectional area of the fourth lips 81d and 82d.
  • any one or more of the first to third lips 81a to 81c and 82a to 82c may be used more than the fourth lips 81d and 82d.
  • FIG. 10A is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention.
  • FIG. 10B is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention.
  • FIG. 11 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the second embodiment of the present invention. Note that FIG. 10A shows a state in which the seal ring 80 is not housed in the annular open space S. FIG. 10B shows a state in which the seal ring 80 is housed.
  • the bottom surface 38 of the step 36 is a flat surface and is formed so as to be orthogonal to the side surface 37 of the step 36.
  • the bottom surface 38 of the step 36 includes a first bottom surface 38a located on the outer side in the radial direction and a second bottom surface 38b located on the inner side in the radial direction and continuous with the side surface 37 and the first bottom surface 38a of the step 36. Includes.
  • the first bottom surface 38a and the second bottom surface 38b are inclined in different directions with respect to the axial direction.
  • the first bottom surface 38a extends to the radial outer edge of the outer surface of the end plate 30 and is inclined downward toward the radial outer side, that is, toward the bottom side of the frame 20.
  • the outer peripheral portion of the outer surface of the end plate 30 has a forward taper shape toward the lower side.
  • the side surface 37 of the step 36 and the second bottom surface 38b are orthogonal to each other.
  • the first bottom surface 38a is set to be a surface that is inclined at a predetermined inclination angle with respect to the second bottom surface 38b, but the present invention is not particularly limited to this.
  • the inclination angle is the radial width of the bottom surface 38, the axial height of the annular open space S, the filling rate of the seal ring 80 with respect to the annular open space S, the material of the seal ring 80, or the first seal ring 80. It can be appropriately changed depending on the radius of curvature of the lip 80a and the like.
  • the first bottom surface 38a is formed by forming the radial outer edge portion of the outer surface of the end plate 30 in a straight line in a cross-sectional view in the axial direction.
  • the first bottom surface 38a is an inclined surface whose radial outer edge portion extends linearly over the extension of the radial inner portion. Therefore, the first corner portion C1 is configured to form an acute angle in the cross-sectional view in the axial direction.
  • the end plate 30 is a resin member integrally molded using a mold, and the corners are not cut out.
  • the first bottom surface 38a is formed so that the radial width L1 is less than half of the radial width L of the bottom surface 38 of the step 36.
  • the protrusion height A in the axial direction of the seal ring 80 is larger than the height B in the axial direction of the first bottom surface 38a. It is housed in an annular open space S so as to be large.
  • the first bottom surface 38a of the step 36 is the above-mentioned inclined surface, while the second bottom surface 38b is inclined in a direction different from that of the first bottom surface 38a and is orthogonal to the side surface 37 of the step 36.
  • the seal ring 80 in contact with the surface 221 of the load 200 is pressed downward, the amount of deformation and the contact surface pressure of the fourth lip 80d at the fourth corner portion C4 are the same as in the case shown in FIG. 4B.
  • the first corner portion C1 has a larger space volume extending downward, that is, toward the bottom side of the frame 20 than in the case shown in FIG. 4B.
  • the first lip 80a can be displaced along the first bottom surface 38a which is an inclined surface.
  • the amount by which the first lip 80a of the seal ring 80 is deformed and enters the first corner portion C1 becomes larger than that shown in FIG. 4B.
  • the contact pressure of the seal ring 80 at the first corner portion C1 becomes higher than that shown in FIG. 4B.
  • the contact pressure at which the first lip 80a presses the inner peripheral surface 23 of the frame 20 becomes low in the first corner portion C1. It is the same as the case shown in FIG. 4B.
  • the contact pressure of the seal ring 80 at the first corner portion C1 is in a high state in advance. Therefore, it is possible to sufficiently cover the decrease in the contact surface pressure of the seal ring 80 at the first corner portion C1 described above and prevent moisture or the like from entering the inside of the frame 20.
  • a step 36 is formed on the outer peripheral portion of the outer surface of the resin end plate 30 that covers the opening 21 of the frame 20.
  • the first bottom surface 38a located on the outer side in the radial direction extends to the radial outer edge of the outer surface of the end plate 30 and is directed downward toward the outer side in the radial direction, that is, toward the bottom side of the frame 20. It is inclined to.
  • the highly reliable motor 100 can be realized by maintaining the airtightness at the first corner portion C1 which is a path through which moisture or the like directly enters the inside of the frame 20.
  • the first corner portion C1 is compressed and deformed in the radial direction of the first lip 80a. It is possible to suppress the amount from becoming small and maintain the contact pressure of the frame 20 with respect to the inner peripheral surface 23 to a desired value or more. As a result, the airtightness at the first corner portion C1 can be maintained even when the end plate 30 is thermally creep-deformed.
  • the axial protrusion height A of the seal ring 80 is made larger than the axial height B of the first bottom surface 38a. As a result, it is possible to suppress a decrease in the filling rate of the seal ring 80 with respect to the annular open space S, and to secure sufficient airtightness by the seal ring 80.
  • the position of the seal ring 80 in the annular open space S can be stabilized. Further, it is the same as that shown in the first embodiment that the contact surface pressure is dispersed over the entire cross section of the seal ring 80 by reducing the twist.
  • first bottom surface 38a may be an inclined surface extending linearly from the radial outer edge portion to the radial inner portion.
  • FIG. 12 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second modification.
  • FIG. 13 is another schematic cross-sectional view of the connecting portion between the end plate and the frame according to the second modification.
  • the same parts as those in the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the illustration of the seal ring 80 is omitted.
  • FIGS. 10A, 10B, and 11 an example in which the first bottom surface 38a is formed by forming the radial outer edge portion of the outer surface of the end plate 30 in a linear shape in a cross-sectional view in the axial direction.
  • the first bottom surface 38a is such that the space volume extending downward is increased and the first bottom surface 38a and the second bottom surface 38b are inclined in different directions with respect to the axial direction.
  • the shape of the Therefore, as shown in FIG. 12, the radial outer edge of the outer surface of the end plate 30 may be curved outward in the radial direction toward the bottom of the frame 20, that is, an R-chamfered shape. Good.
  • the radial outer edge portion of the first bottom surface 38a may have a fillet shape that curves outward in the radial direction toward the bottom side of the frame 20, that is, an R chamfered shape.
  • the second bottom surface 38b may be an inclined surface on the opposite side of the first bottom surface 38a, and a convex portion may be formed on the bottom surface 38.
  • the shape of the first bottom surface 38a may be the shape shown in FIG. In either case, the airtightness at the first corner portion C1 can be maintained to prevent moisture or the like from entering the inside of the frame 20. Therefore, a highly reliable motor 100 and an electric device 300 can be realized.
  • each modification and each component shown in the first and second embodiments can be appropriately combined to form a new embodiment.
  • the seal rings 81 and 82 shown in the first modification can be applied to the motor 100 shown in the second embodiment.
  • the bottom surface 38 of the step 36 formed on the end plate 30 may be an inclined surface extending linearly from the side surface 37 of the step 36 to the radial outer edge of the outer surface of the end plate 30.
  • the motor 100 is a brushed motor
  • the present invention is not particularly limited to this, and for example, it may be a brushless motor or another type of motor.
  • the case where the motor 100 in the present embodiment is used for a so-called inner rotor type motor in which the stator 60 is arranged on the radial outer side of the rotor 50 has been described.
  • a so-called outer rotor type motor in which rotors 50 are arranged at predetermined intervals on the radial outer side of the stator 60.
  • the bearing 41 arranged on the through hole 32 side of the end plate 30 is housed in the bearing holding portion 34 and is in contact with the outer surface of the end plate 30. However, it may be disposed on the inner surface side of the end plate 30 and housed inside the frame 20.
  • the brush 70 is housed in the brush holding portion 33 provided integrally with the end plate 30.
  • the brush holding portion 33 may be provided inside the frame 20 separately from the end plate 30 to accommodate the brush 70.
  • the stator 60 is composed of a frame 20 and a plurality of permanent magnets 61.
  • a field winding may be wound around each of a plurality of field magnetic poles arranged at predetermined intervals in the circumferential direction to form the stator 60.
  • the motor according to the present invention can prevent the ingress of moisture, oil, etc. from the outside. Therefore, it is useful for application to electric devices including fluid pumps such as hydraulic pumps and electric devices arranged in a high temperature external environment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Provided is a motor including: a frame; a stator and a rotor that are stored in the frame; a resin end plate covering the opening of the frame; and a seal ring including an annular elastic body. An annular open space for storing the seal ring is comparted and formed between a step formed on the end plate and the inner peripheral surface of the frame. The seal ring has an X-shaped cross section and includes first to fourth lips. The fourth lip abuts a corner of the step. The first to third lips have a cross sectional area larger than that of the fourth lip.

Description

モータ及びそれを備えた電気機器Motors and electrical equipment equipped with them
　本発明は、モータ及びそれを備えた電気機器に関する。本発明は、特に、外部からの水分または油等の進入を防止する構造を備えたモータに関する。 The present invention relates to a motor and an electric device including the motor. The present invention particularly relates to a motor having a structure for preventing the ingress of moisture, oil, etc. from the outside.
　近年、電装用機器や電動工具等、あるいは車載用途でモータが多用されている。例えば、アンチロック・ブレーキシステム（ＡＢＳ、Ａｎｔｉ－ｌｏｃｋ　Ｂｒａｋｅ　Ｓｙｓｔｅｍ）に用いられる油圧ポンプを駆動するために小型モータが用いられている。これらの用途に用いられるモータは、小型軽量化を一段と要求されながら、高い信頼性が求められている。ＡＢＳに用いられるモータは、車両のエンジンルームに配置される。このため、雨天時などに外部からの水分がモータにかかる場合があり、十分な防水対策を行う必要がある。 In recent years, motors have been widely used for electrical equipment, power tools, etc., or for in-vehicle applications. For example, a small motor is used to drive a hydraulic pump used in an anti-lock braking system (ABS, Anti-lock Break System). Motors used in these applications are required to have higher reliability while being further required to be smaller and lighter. The motor used for ABS is located in the engine compartment of the vehicle. For this reason, moisture from the outside may be applied to the motor in rainy weather, etc., and it is necessary to take sufficient waterproof measures.
　そこで、従来、モータの外郭であるフレームの開口に圧入されてこの開口を覆うエンドプレートにおいて、整流子と軸受の間で軸受に回転自在に支持される回転軸の周りに沿って一定の隙間をもった壁を形成することで、上記の課題を解決する技術が提案されている（例えば、特許文献１を参照）。なお、モータ内の回転子及び固定子等との電気的絶縁を図るために、一般に、エンドプレートは樹脂材料で形成されている。 Therefore, conventionally, in an end plate that is press-fitted into an opening of a frame that is an outer shell of a motor and covers this opening, a constant gap is provided between the commutator and the bearing along a rotation shaft that is rotatably supported by the bearing. A technique for solving the above problems by forming a bearing wall has been proposed (see, for example, Patent Document 1). The end plate is generally made of a resin material in order to electrically insulate the rotor and the stator in the motor.
　ところで、上記の水分等は、主に、エンドプレートとフレームとの連結部分からフレームの内部に進入する。そのため、この連結部分にはＯリング及びＸリング等のシールリングが配設されて水分等がフレーム内に進入するのを防止している。一方、モータと負荷とを組み付けるときに、エンドプレートに負荷側から軸方向に圧力が加わった状態で組み付けられ、この状態が維持される。 By the way, the above-mentioned moisture etc. mainly enters the inside of the frame from the connecting portion between the end plate and the frame. Therefore, a seal ring such as an O-ring and an X-ring is provided at this connecting portion to prevent moisture or the like from entering the frame. On the other hand, when the motor and the load are assembled, the end plate is assembled in a state where pressure is applied in the axial direction from the load side, and this state is maintained.
　しかし、一般に、樹脂材料に圧力が加えられた状態で温度が上昇すると、樹脂材料が熱クリープによる変形を起こすことが知られている。エンドプレートの熱クリープ変形が生じるとエンドプレートとフレームと負荷側とのシールリングの接面圧力が低下し、シールリングとそれらの接触部との間に隙間が生じ、十分な気密性が維持できなくなる。この状態で、外部からその隙間に水がかかるとモータ内部へ水が進入して、モータの信頼性または絶縁性を著しく低下させるおそれがあった。 However, it is generally known that when the temperature rises while pressure is applied to the resin material, the resin material is deformed by thermal creep. When thermal creep deformation of the end plate occurs, the contact pressure of the seal ring between the end plate, the frame, and the load side decreases, a gap is created between the seal ring and their contact area, and sufficient airtightness can be maintained. It disappears. In this state, if water splashes into the gap from the outside, water may enter the inside of the motor, which may significantly reduce the reliability or insulation of the motor.
特開２００２－２０４５４８号公報Japanese Unexamined Patent Publication No. 2002-204548
　本発明はかかる点に鑑みてなされたものである。本発明の目的は、エンドプレートとフレームとの連結部分の気密性を維持した高信頼性のモータ及びそれを用いた電気機器を提供することにある。 The present invention has been made in view of this point. An object of the present invention is to provide a highly reliable motor that maintains the airtightness of a connecting portion between an end plate and a frame, and an electric device using the same.
　上記の目的を達成するために、本発明に係るモータは、一端が開口された有底筒状のフレームと、フレーム内に収容された固定子と、フレーム内に収容され、固定子と所定の間隔をあけて配置された回転子と、フレームの開口に開口を覆うように配設され、回転軸が挿通される貫通孔が中心に設けられた板状部材であるエンドプレートと、環状の弾性体からなり、フレームの内部の気密を保つためのシールリングと、を少なくとも備え、エンドプレートの外面の外周部に形成された段差とフレームの内周面との間に環状の開放空間が区画形成され、シールリングが開放空間に収容されており、シールリングは断面がＸ字形状で第１～第４リップを有しており、第４リップは段差の角部に当接しており、第１～第３リップのうちの少なくとも１つは、第４リップよりも断面積が大きい。 In order to achieve the above object, the motor according to the present invention includes a bottomed tubular frame having one end opened, a stator housed in the frame, and a stator housed in the frame. Rotors arranged at intervals, an end plate which is a plate-like member arranged so as to cover the opening in the opening of the frame and having a through hole through which the rotation shaft is inserted, and an annular elasticity. It consists of a body and is equipped with at least a seal ring for maintaining the airtightness inside the frame, and an annular open space is formed between the step formed on the outer peripheral surface of the outer surface of the end plate and the inner peripheral surface of the frame. The seal ring is housed in an open space, the seal ring has an X-shaped cross section and has first to fourth lips, and the fourth lip is in contact with the corner of the step, and the first -At least one of the third lip has a larger cross-sectional area than the fourth lip.
　この構成によれば、フレームの内周面を含む開放空間のコーナー部でのシールリングの接面圧力を高くすることができる。モータの回転軸に負荷が連結された場合、この負荷とフレームの内周面とで構成されるコーナー部でのシールリングの接面圧力を高くすることができる。このことにより、エンドプレートが熱または圧力の影響で変形した場合にもコーナー部での気密性を維持して、フレームの内部への水分等の進入を防止できる。これにより、高信頼性のモータを実現できる。 According to this configuration, the contact pressure of the seal ring at the corner of the open space including the inner peripheral surface of the frame can be increased. When a load is connected to the rotating shaft of the motor, the contact pressure of the seal ring at the corner portion formed by this load and the inner peripheral surface of the frame can be increased. As a result, even when the end plate is deformed due to the influence of heat or pressure, the airtightness at the corners can be maintained and moisture or the like can be prevented from entering the inside of the frame. As a result, a highly reliable motor can be realized.
　本発明に係る電気機器は、モータと、モータに連結され、エンドプレートの外側に貫通孔から突出した回転軸に駆動連結されていて、モータの回転に応じて駆動される被駆動部を有する負荷と、を少なくとも備え、シールリングは、負荷の表面からフレームの底部側に押圧されることで、第１リップが段差の底面とフレームの内周面とで構成される第１コーナー部に、第２リップが負荷の表面とフレームの内周面とで構成される第２コーナー部に、第３リップが負荷の表面と段差の側面とで構成される第３コーナー部に、第４リップが段差の角部である第４コーナー部にそれぞれ当接している。 The electric device according to the present invention is a load having a motor, a driven portion connected to the motor, driven to a rotating shaft protruding from a through hole on the outside of the end plate, and driven in response to the rotation of the motor. When the seal ring is pressed from the surface of the load toward the bottom side of the frame, the first lip is formed at the first corner portion formed by the bottom surface of the step and the inner peripheral surface of the frame. The second lip is on the second corner composed of the surface of the load and the inner peripheral surface of the frame, the third lip is on the third corner composed of the surface of the load and the side surface of the step, and the fourth lip is on the step. It is in contact with the fourth corner portion, which is the corner portion of the above.
　この構成によれば、シールリングの断面をＸ字形状とすることで、外部からの水分等の進入経路にあたる第１～第３コーナー部に対して、第１～第３リップがそれぞれ所定の接面圧力で当接する。よって、フレームの内部または負荷の内部への水分等の進入を確実に防止できる。これにより、高信頼性の電気機器を実現できる。 According to this configuration, by forming the cross section of the seal ring into an X shape, the first to third lips are in predetermined contact with the first to third corners, which correspond to the entry path of moisture from the outside. Contact with surface pressure. Therefore, it is possible to reliably prevent the ingress of moisture or the like into the inside of the frame or the inside of the load. As a result, highly reliable electrical equipment can be realized.
　以上説明したように、本発明によれば、エンドプレートが熱または圧力の影響で変形した場合にも、フレームの内部への水分等の進入を防止できる。これにより、高信頼性のモータを実現できる。 As described above, according to the present invention, even when the end plate is deformed due to the influence of heat or pressure, it is possible to prevent moisture or the like from entering the inside of the frame. As a result, a highly reliable motor can be realized.
図１は、本発明の実施形態１に係る電気機器の要部の断面模式図である。FIG. 1 is a schematic cross-sectional view of a main part of an electric device according to a first embodiment of the present invention. 図２は、比較のためのエンドプレートとシールリングとの経時変形を説明する模式図である。FIG. 2 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring for comparison. 図３は、シールリングの断面模式図である。FIG. 3 is a schematic cross-sectional view of the seal ring. 図４Ａは、電気機器の組立前でのエンドプレートとフレームとの連結部分の断面模式図である。FIG. 4A is a schematic cross-sectional view of a connecting portion between the end plate and the frame before assembling the electrical equipment. 図４Ｂは、電気機器の組立後でのエンドプレートとフレームとの連結部分の断面模式図である。FIG. 4B is a schematic cross-sectional view of a connecting portion between the end plate and the frame after assembling the electrical equipment. 図５は、実施形態１に係るエンドプレートとシールリングとの経時変形を説明する模式図である。FIG. 5 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the first embodiment. 図６は、変形例１に係るシールリングの断面模式図である。FIG. 6 is a schematic cross-sectional view of the seal ring according to the first modification. 図７は、変形例１に係るエンドプレートとフレームとの連結部分の断面模式図である。FIG. 7 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the first modification. 図８は、変形例１に係る別のシールリングの断面模式図である。FIG. 8 is a schematic cross-sectional view of another seal ring according to the first modification. 図９は、変形例１に係るエンドプレートとフレームとの別の連結部分の断面模式図である。FIG. 9 is a schematic cross-sectional view of another connecting portion between the end plate and the frame according to the first modification. 図１０Ａは、本発明の実施形態２に係るエンドプレートとフレームとの連結部分の断面模式図である。FIG. 10A is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention. 図１０Ｂは、本発明の実施形態２に係るエンドプレートとフレームとの連結部分の断面模式図である。FIG. 10B is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention. 図１１は、本発明の実施形態２に係るエンドプレートとシールリングとの経時変形を説明する模式図である。FIG. 11 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the second embodiment of the present invention. 図１２は、変形例２に係るエンドプレートとフレームとの連結部分の断面模式図である。FIG. 12 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second modification. 図１３は、変形例２に係るエンドプレートとフレームとの連結部分の別の断面模式図である。FIG. 13 is another schematic cross-sectional view of the connecting portion between the end plate and the frame according to the second modification.
　以下、本発明の実施形態を図面に基づいて詳細に説明する。以下の好ましい実施形態の説明は、本質的に例示に過ぎず、本発明、その適用物或いはその用途を制限することを意図するものでは全くない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of preferred embodiments is merely exemplary and is not intended to limit the present invention, its applications or its uses.
　（実施形態１）
　［モータ及び電気機器の構成］
　図１は、本発明の実施形態１に係る電気機器の要部の断面模式図である。 (Embodiment 1)
[Structure of motor and electrical equipment]
FIG. 1 is a schematic cross-sectional view of a main part of an electric device according to a first embodiment of the present invention.
　図１に示すように、モータ１００は、フレーム２０と、エンドプレート３０と、軸受（ベアリング）４０，４１と、回転子５０と、固定子６０と、ブラシ７０と、シールリング８０とを備えている。電気機器３００は、負荷２００とモータ１００とを備えている。なお、以降の説明において、回転子５０の一部をなす回転軸５４の長手方向を軸方向と呼び、エンドプレート３０の半径方向を径方向と呼び、エンドプレート３０の円周方向を周方向と呼ぶことがある。軸方向において、フレーム２０におけるエンドプレート３０が配設された側を「上」と、その反対側であるフレーム２０の底部側を「下」と呼ぶことがある。説明の便宜上、負荷２００の細部は図示を省略している。 As shown in FIG. 1, the motor 100 includes a frame 20, an end plate 30, bearings 40 and 41, a rotor 50, a stator 60, a brush 70, and a seal ring 80. There is. The electric device 300 includes a load 200 and a motor 100. In the following description, the longitudinal direction of the rotating shaft 54 forming a part of the rotor 50 is referred to as an axial direction, the radial direction of the end plate 30 is referred to as a radial direction, and the circumferential direction of the end plate 30 is referred to as a circumferential direction. I may call it. In the axial direction, the side of the frame 20 on which the end plate 30 is arranged may be referred to as "upper", and the opposite side of the frame 20 may be referred to as "lower". For convenience of explanation, the details of the load 200 are not shown.
　フレーム２０は、上部に設けられた開口２１の周りに鍔部を有する有底半筒状の金属部材である。フレーム２０の底面には回転軸５４の一端に挿通される軸受保持部２２が形成されている。フレーム２０の内周面２３のうち上側にはエンドプレート３０の内面に当接してこれを支持するプレート支持部２４（図４Ａ～図９を参照）が周方向に間隔を開けて複数配設されている。エンドプレート３０を開口２１に圧入するために、フレーム２０の上端部、つまり、開口２１の近傍には、径方向外側に屈曲した環状のフランジ２５が形成されている。 The frame 20 is a bottomed semi-cylindrical metal member having a collar around an opening 21 provided at the top. A bearing holding portion 22 inserted into one end of the rotating shaft 54 is formed on the bottom surface of the frame 20. A plurality of plate support portions 24 (see FIGS. 4A to 9) that abut and support the inner surface of the end plate 30 are arranged on the upper side of the inner peripheral surface 23 of the frame 20 at intervals in the circumferential direction. ing. In order to press-fit the end plate 30 into the opening 21, an annular flange 25 bent outward in the radial direction is formed at the upper end of the frame 20, that is, in the vicinity of the opening 21.
　エンドプレート３０は、樹脂材料を成形してなる板状部材である。エンドプレート３０は、実質的に円板状の基部３１と、基部３１の中心に設けられた貫通孔３２と、基部３１の内面に形成されたブラシ保持部３３と、基部３１の外面に形成された軸受保持部３４と、モータ１００に外部から電力を供給するための電線が引き出された電線引出口（図示せず）と、基部３１の外面であって、その外周部に形成された段差３６とを有している。エンドプレート３０の形状、特に段差３６の形状の詳細については後述する。電線引出口から引き出された電線については、説明の便宜上、図示を省略している。上記のように、フレーム２０の内部に面したエンドプレート３０の表面を、エンドプレート３０の「内面」と呼び、内面と反対側のエンドプレート３０の表面を、エンドプレート３０の「外面」と呼ぶことがある。 The end plate 30 is a plate-shaped member formed by molding a resin material. The end plate 30 is formed on a substantially disk-shaped base portion 31, a through hole 32 provided in the center of the base portion 31, a brush holding portion 33 formed on the inner surface of the base portion 31, and an outer surface of the base portion 31. A bearing holding portion 34, an electric wire outlet (not shown) from which an electric wire for supplying electric power to the motor 100 from the outside is drawn out, and a step 36 formed on the outer peripheral portion of the outer surface of the base portion 31. And have. Details of the shape of the end plate 30, particularly the shape of the step 36, will be described later. The electric wire drawn from the electric wire outlet is not shown for convenience of explanation. As described above, the surface of the end plate 30 facing the inside of the frame 20 is referred to as the "inner surface" of the end plate 30, and the surface of the end plate 30 opposite to the inner surface is referred to as the "outer surface" of the end plate 30. Sometimes.
　エンドプレート３０は、フレーム２０との位置決めを行った上で、フレーム２０の開口２１に圧入される。エンドプレート３０は、内面がフレーム２０に設けられたプレート支持部２４に当接される。エンドプレート３０は、開口２１を覆うようにフレーム２０に配設されている。フレーム２０とエンドプレート３０とで区画される空間に回転子５０が収容されている。回転軸５４は、エンドプレート３０の貫通孔３２に挿通されてエンドプレート３０から外側に突出している。回転軸５４は、フレーム２０の軸受保持部２２に保持された軸受４０及び，貫通孔３２を塞ぐように設けられた軸受４１によって回転自在に支持されている。エンドプレート３０の外面の外周部には段差３６が形成されている（図２を参照）。段差３６の底面３８は平坦面である。底面３８は、段差３６の側面３７と互いに直交するように形成されている。「直交」とは段差３６の加工公差を含んで「直交」という意味であり、比較対象となる両者が厳密に直交していることまでを意味するものではない。 The end plate 30 is press-fitted into the opening 21 of the frame 20 after being positioned with the frame 20. The inner surface of the end plate 30 is in contact with the plate support portion 24 provided on the frame 20. The end plate 30 is arranged in the frame 20 so as to cover the opening 21. The rotor 50 is housed in a space partitioned by the frame 20 and the end plate 30. The rotating shaft 54 is inserted through the through hole 32 of the end plate 30 and projects outward from the end plate 30. The rotating shaft 54 is rotatably supported by a bearing 40 held by the bearing holding portion 22 of the frame 20 and a bearing 41 provided so as to close the through hole 32. A step 36 is formed on the outer peripheral portion of the outer surface of the end plate 30 (see FIG. 2). The bottom surface 38 of the step 36 is a flat surface. The bottom surface 38 is formed so as to be orthogonal to the side surface 37 of the step 36. “Orthogonal” means “orthogonal” including the processing tolerance of the step 36, and does not mean that the two to be compared are strictly orthogonal to each other.
　回転子５０は、電機子コア５１と、複数の突極５２と、電機子巻線５３と回転軸５４と、整流子５５と、インシュレータ５６とを有している。電機子コア５１には径方向外側に突出する複数の突極５２が周方向に所定の間隔をあけて配設されている。電機子コア５１には、複数の突極５２のそれぞれに絶縁性の樹脂であるインシュレータ５６を介して電機子巻線５３が巻回されている。整流子５５には、電機子コア５１から引き出された電機子巻線５３の引出線が接続されている。回転軸５４は回転子５０の軸心に設けられ、電機子コア５１及び整流子５５の中心を貫通してこれらに連結されている。 The rotor 50 has an armature core 51, a plurality of salient poles 52, an armature winding 53, a rotating shaft 54, a commutator 55, and an insulator 56. A plurality of salient poles 52 projecting outward in the radial direction are arranged on the armature core 51 at predetermined intervals in the circumferential direction. An armature winding 53 is wound around the armature core 51 via an insulator 56, which is an insulating resin, around each of the plurality of salient poles 52. The commutator 55 is connected to the leader wire of the armature winding 53 drawn from the armature core 51. The rotating shaft 54 is provided at the axis of the rotor 50, penetrates the center of the armature core 51 and the commutator 55, and is connected to them.
　固定子６０は、フレーム２０と、周方向に所定の間隔でフレーム２０の内周面２３に配設された複数の永久磁石６１とで構成されている。周方向に隣り合う永久磁石６１は互いに極性が異なるように配設されている。フレーム２０は、永久磁石６１と磁気回路を構成するヨークとしても機能する。 The stator 60 is composed of a frame 20 and a plurality of permanent magnets 61 arranged on the inner peripheral surface 23 of the frame 20 at predetermined intervals in the circumferential direction. The permanent magnets 61 adjacent to each other in the circumferential direction are arranged so as to have different polarities from each other. The frame 20 also functions as a yoke constituting the permanent magnet 61 and the magnetic circuit.
　一対のブラシ７０は、黒鉛等のカーボンブラシ材へ固体潤滑剤を含む。一対のブラシ７０は、エンドプレート３０の内面に設けられたブラシ保持部３３内に保持される。一対のブラシ７０は、ブラシバネ（図示せず）によって整流子５５へと押圧されている。 The pair of brushes 70 contains a solid lubricant in a carbon brush material such as graphite. The pair of brushes 70 are held in the brush holding portion 33 provided on the inner surface of the end plate 30. The pair of brushes 70 are pressed against the commutator 55 by a brush spring (not shown).
　シールリング８０は、環状の弾性体、例えば、ＥＰＤＭ（エチレン・プロピレン・ジエンゴム、Ｅｔｈｙｌｅｎｅ　Ｐｒｏｐｙｌｅｎｅ　Ｄｉｅｎｅ　Ｍｏｎｏｍｅｒ　Ｒｕｂｂｅｒ）、ニトリルゴム、またはフッ化ゴム等からなる。シールリング８０は、断面がＸ字形状で４つのリップ８０ａ～８０ｄを有している。なお、シールリング８０の形状については後で詳述する。 The seal ring 80 is made of an annular elastic body, for example, EPDM (ethylene propylene diene rubber, Ethylene Propyrene Diene Monomer Rubber), nitrile rubber, fluororubber, or the like. The seal ring 80 has an X-shaped cross section and has four lips 80a to 80d. The shape of the seal ring 80 will be described in detail later.
　シールリング８０は、前述の段差３６と段差３６の側面３７に対向するフレーム２０の内周面２３との間に区画形成された環状の開放空間Ｓに収容されている。シールリング８０は、フレーム２０とエンドプレート３０との連結部分をシールして、外部からフレーム２０の内部への水分等の進入を防止している。なお、環状の開放空間Ｓは上方が開放された開放空間である。 The seal ring 80 is housed in an annular open space S partitioned between the above-mentioned step 36 and the inner peripheral surface 23 of the frame 20 facing the side surface 37 of the step 36. The seal ring 80 seals the connecting portion between the frame 20 and the end plate 30 to prevent moisture and the like from entering the inside of the frame 20 from the outside. The annular open space S is an open space whose upper part is open.
　以上のように構成されたモータ１００の動作について説明する。 The operation of the motor 100 configured as described above will be described.
　エンドプレート３０に設けられた電線引出口から引き出された電線（図示せず）を介して外部からモータ１００に電力を供給する。これにより、電機子電流がブラシ７０及び整流子５５を介して電機子巻線５３に流れる。固定子６０で発生した磁束と、電機子巻線５３を流れる電機子電流により発生した磁界との間で相互作用を生じてトルクが発生する。回転軸５４が軸受４０，４１に支持されて回転する。回転軸５４の回転に応じて、ブラシ７０と整流子５５とは接触と離間とを周期的に繰り返し、この周期に対応して電機子巻線５３を流れる電機子電流の向きが変更される。 Power is supplied to the motor 100 from the outside via an electric wire (not shown) drawn from an electric wire outlet provided on the end plate 30. As a result, the armature current flows through the armature winding 53 via the brush 70 and the commutator 55. Torque is generated by causing an interaction between the magnetic flux generated by the stator 60 and the magnetic field generated by the armature current flowing through the armature winding 53. The rotating shaft 54 is supported by the bearings 40 and 41 and rotates. In response to the rotation of the rotating shaft 54, the brush 70 and the commutator 55 periodically repeat contact and separation, and the direction of the armature current flowing through the armature winding 53 is changed in accordance with this cycle.
　電気機器３００において、モータ１００の上側に負荷２００が配置されている。エンドプレート３０の外側に貫通孔３２から突出した回転軸５４に対して被駆動部２１０が駆動連結されている。被駆動部２１０は、回転軸５４の回転に応じて同方向または逆方向に回転するか、あるいは回転運動を直線運動に変換する機械要素（図示せず）を備えている。負荷２００は、例えば、油圧ポンプである。ただし、これに限定されない。 In the electric device 300, the load 200 is arranged on the upper side of the motor 100. The driven portion 210 is drive-connected to the rotating shaft 54 protruding from the through hole 32 on the outside of the end plate 30. The driven unit 210 includes a mechanical element (not shown) that rotates in the same direction or in the opposite direction according to the rotation of the rotating shaft 54, or converts the rotational motion into a linear motion. The load 200 is, for example, a hydraulic pump. However, it is not limited to this.
　さらに、負荷２００の外郭２２０は、その表面２２１がフレーム２０とシールリング８０の第２及び第３リップ８０ｂ，８０ｃとに当接して、モータ１００に組み付けられている。外郭２２０の表面２２１とエンドプレート３０の外面とが所定のクリアランスを保って離間するようにモータ１００と負荷２００とは配置されている。外郭２２０は、例えば、アルミニウム製のブロックである。ただし、これに限定されない。また、以降の説明において、外郭２２０の表面２２１を、負荷２００の表面２２１と呼ぶことがある。 Further, the outer shell 220 of the load 200 is assembled to the motor 100 with its surface 221 in contact with the frame 20 and the second and third lips 80b and 80c of the seal ring 80. The motor 100 and the load 200 are arranged so that the surface 221 of the outer shell 220 and the outer surface of the end plate 30 are separated from each other while maintaining a predetermined clearance. The outer shell 220 is, for example, a block made of aluminum. However, it is not limited to this. Further, in the following description, the surface 221 of the outer shell 220 may be referred to as the surface 221 of the load 200.
　負荷２００の表面２２１から下側、つまり、フレーム２０の底部側に押圧されることにより、シールリング８０は圧縮変形して、４つのリップ８０ａ～８０ｄが、環状の開放空間Ｓと負荷２００の表面２２１とで区画される空間の４つのコーナー部Ｃ１～Ｃ４（図２～図４Ｂを参照）に当接している。 When pressed from the surface 221 of the load 200 to the lower side, that is, to the bottom side of the frame 20, the seal ring 80 is compressed and deformed, and the four lips 80a to 80d are formed into an annular open space S and the surface of the load 200. It is in contact with four corner portions C1 to C4 (see FIGS. 2 to 4B) of the space partitioned by 221.
　第１リップ８０ａは、エンドプレート３０に形成された段差３６の底面３８とフレーム２０の内周面２３とで構成される第１コーナー部Ｃ１に当接している。第２リップ８０ｂは、フレーム２０の内周面２３と負荷２００の表面２２１とで構成される第２コーナー部Ｃ２に当接している。前述したように、フレーム２０の上端部には径方向外側に屈曲したフランジ２５が形成されている。よって、第２コーナー部Ｃ２において、第２リップ８０ｂは、フレーム２０の内周面２３には十分に当接せずに、さらには、主に負荷２００の表面２２１のみに当接する場合もあり得る。また、第３リップ８０ｃは、負荷２００の表面２２１と段差３６の側面３７とで構成される第３コーナー部Ｃ３に当接している。第４リップ８０ｄは、段差３６の角部に相当する第４コーナー部Ｃ４に当接している。第１リップ８０ａは、断面視で第３リップ８０ｃの対角に、第２リップ８０ｂは、断面視で第４リップ８０ｄの対角にそれぞれ位置している。 The first lip 80a is in contact with the first corner portion C1 composed of the bottom surface 38 of the step 36 formed on the end plate 30 and the inner peripheral surface 23 of the frame 20. The second lip 80b is in contact with the second corner portion C2 composed of the inner peripheral surface 23 of the frame 20 and the surface 221 of the load 200. As described above, a flange 25 bent outward in the radial direction is formed at the upper end of the frame 20. Therefore, in the second corner portion C2, the second lip 80b may not sufficiently contact the inner peripheral surface 23 of the frame 20, and may mainly contact only the surface 221 of the load 200. .. Further, the third lip 80c is in contact with the third corner portion C3 composed of the surface 221 of the load 200 and the side surface 37 of the step 36. The fourth lip 80d is in contact with the fourth corner portion C4 corresponding to the corner portion of the step 36. The first lip 80a is located diagonally to the third lip 80c in cross-sectional view, and the second lip 80b is located diagonally to the fourth lip 80d in cross-sectional view.
　このように、シールリング８０と負荷２００、フレーム２０及びエンドプレート３０とが当接して、接面部に圧力が加わる。これにより、フレーム２０とエンドプレート３０との間及びフレーム２０と負荷２００との間がシールされる。よって、負荷２００側からフレーム２０の内部へ外部からの水分が進入するのを防止できる。エンドプレート３０と負荷２００との間もシールされることで、軸受４１または回転軸５４への水分等の付着を防止できる。 In this way, the seal ring 80 comes into contact with the load 200, the frame 20 and the end plate 30, and pressure is applied to the contact surface portion. As a result, the space between the frame 20 and the end plate 30 and the space between the frame 20 and the load 200 are sealed. Therefore, it is possible to prevent moisture from the outside from entering the inside of the frame 20 from the load 200 side. By sealing between the end plate 30 and the load 200, it is possible to prevent moisture or the like from adhering to the bearing 41 or the rotating shaft 54.
　［本願発明に至った知見］
　図２は、比較のためのエンドプレートとシールリングとの経時変形を説明する模式図である。説明の便宜上、モータ１００において、フレーム２０とエンドプレート３０とシールリング８０と軸受４１以外の構成部材については図示を省略している。負荷２００において、表面２２１を含む外郭２２０の一部のみを図示している。 [Findings leading to the invention of the present application]
FIG. 2 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring for comparison. For convenience of explanation, in the motor 100, components other than the frame 20, the end plate 30, the seal ring 80, and the bearing 41 are not shown. At the load 200, only a part of the outer shell 220 including the surface 221 is shown.
　図２において、上側の図は、モータ１００と負荷２００とが組み付けられた直後の状態を示している。この状態では、各部材は、組立公差の範囲内で設計通りの配置関係を保っている。ただし、この状態で負荷２００側からモータ１００側に圧力がかかっている。例えば、図２に示す場合では、軸受保持部３４に収容された軸受４１を介してエンドプレート３０の中央部に圧力が加えられている。軸受４１がフレーム２０の内部に配置されている場合にも、負荷２００側からエンドプレート３０の中央部に圧力が加えられる。 In FIG. 2, the upper figure shows the state immediately after the motor 100 and the load 200 are assembled. In this state, each member maintains the arrangement relationship as designed within the range of the assembly tolerance. However, in this state, pressure is applied from the load 200 side to the motor 100 side. For example, in the case shown in FIG. 2, pressure is applied to the central portion of the end plate 30 via the bearing 41 housed in the bearing holding portion 34. Even when the bearing 41 is arranged inside the frame 20, pressure is applied from the load 200 side to the central portion of the end plate 30.
　一方、電気機器３００を使用し始めると、モータ１００の駆動及び負荷２００の動作、さらに電気機器３００が配設された環境の温度等に起因して、モータ１００及び負荷２００の温度が上昇し始める。前述したように、樹脂材料に圧力が加えられた状態で温度が上昇すると、樹脂材料が熱クリープにより変形する。このため、樹脂材料を用いて成形されたエンドプレート３０は中央側が下方に押されるように、また、それに応じて外周側は上方に持ち上げられるように変形する。 On the other hand, when the electric device 300 is started to be used, the temperatures of the motor 100 and the load 200 start to rise due to the driving of the motor 100, the operation of the load 200, the temperature of the environment in which the electric device 300 is arranged, and the like. .. As described above, when the temperature rises while pressure is applied to the resin material, the resin material is deformed by thermal creep. Therefore, the end plate 30 formed by using the resin material is deformed so that the central side is pushed downward and the outer peripheral side is lifted upward accordingly.
　その結果、図２の下側に示すように、エンドプレート３０の外周面とフレーム２０の内周面２３との間、または、フレーム２０の内周面２３と負荷２００の表面２２１との間が開いてしまう。特に、第２コーナー部Ｃ２において、フレーム２０の内周面２３と負荷２００の表面２２１との隙間が大きくなる。第２コーナー部Ｃ２での第２リップ８０ｂの接面圧力が弱まってしまう。段差３６の側面３７とフレーム２０の内周面２３との間が開くことで、第１コーナー部Ｃ１での第１リップ８０ａの接面圧力が弱まってしまう。 As a result, as shown on the lower side of FIG. 2, between the outer peripheral surface of the end plate 30 and the inner peripheral surface 23 of the frame 20, or between the inner peripheral surface 23 of the frame 20 and the surface 221 of the load 200. It will open. In particular, in the second corner portion C2, the gap between the inner peripheral surface 23 of the frame 20 and the surface 221 of the load 200 becomes large. The contact pressure of the second lip 80b at the second corner portion C2 is weakened. By opening the space between the side surface 37 of the step 36 and the inner peripheral surface 23 of the frame 20, the contact pressure of the first lip 80a at the first corner portion C1 is weakened.
　熱クリープによるエンドプレート３０の変形により、第３コーナー部Ｃ３での第３リップ８０ｃの接面圧力及び第４コーナー部Ｃ４での第４リップ８０ｄの接面圧力も弱まってしまう。 Due to the deformation of the end plate 30 due to thermal creep, the contact pressure of the third lip 80c at the third corner C3 and the contact pressure of the fourth lip 80d at the fourth corner C4 also weaken.
　一方、図２から明らかなように、前述の第１～第４コーナー部Ｃ１～Ｃ４のうち、第１～第３コーナー部Ｃ１～Ｃ３が、外部からの水分等の進入経路にあたる。なお、４つのコーナー部Ｃ１～Ｃ４のうち、外部からの水分等の進入が最も起こりやすいのは第２コーナー部Ｃ２である。しかし、モータ１００の信頼性を確保する上で最も気密性の維持が必要なのは、第１コーナー部Ｃ１である。第３コーナー部Ｃ３から水分等の進入が起こると、軸受４１または回転軸５４に対するダメージが大きくなり、モータ１００、ひいては電気機器３００の性能を低下させるおそれがある。 On the other hand, as is clear from FIG. 2, of the above-mentioned first to fourth corner portions C1 to C4, the first to third corner portions C1 to C3 correspond to the entry route of moisture and the like from the outside. Of the four corner portions C1 to C4, the second corner portion C2 is most likely to allow moisture or the like to enter from the outside. However, in order to ensure the reliability of the motor 100, it is the first corner portion C1 that needs to maintain the airtightness most. If moisture or the like enters from the third corner portion C3, the damage to the bearing 41 or the rotating shaft 54 becomes large, which may deteriorate the performance of the motor 100 and eventually the electric device 300.
　このように、シールリング８０による第１～第３コーナー部Ｃ１～Ｃ３でのシール性が低下し、フレーム２０の内部に水分等の流体が進入しやすくなってしまうことを本願発明者等は見出した。 In this way, the inventors of the present application have found that the sealing property of the seal ring 80 at the first to third corners C1 to C3 is lowered, and a fluid such as moisture easily enters the inside of the frame 20. It was.
　そこで、本願発明者等は、シールリング８０の形状に着目した。本願発明者等は、その形状を後で述べるように変更することで、フレーム２０の内部の気密性を維持できることを見出した。 Therefore, the inventors of the present application paid attention to the shape of the seal ring 80. The inventors of the present application have found that the airtightness inside the frame 20 can be maintained by changing the shape as described later.
　［エンドプレートとフレームとの連結部分の構成］
　図３は、シールリングの断面模式図である。図４Ａは、電気機器の組立前でのエンドプレートとフレームとの連結部分の断面模式図である。図４Ｂは、電気機器の組立後でのエンドプレートとフレームとの連結部分の断面模式図である。図５は、本実施形態に係るエンドプレートとシールリングとの経時変形を説明する模式図である。図４Ａは、負荷２００が取り付けられる前のエンドプレート３０とフレーム２０との連結部分の断面を示している。図４Ｂは、負荷２００が取り付けられた後のエンドプレート３０とフレーム２０との連結部分の断面を示している。図４Ａ，図４Ｂ，図５において、負荷２００とフレーム２０とエンドプレート３０のそれぞれの一部の断面も図示している。 [Structure of the connecting part between the end plate and the frame]
FIG. 3 is a schematic cross-sectional view of the seal ring. FIG. 4A is a schematic cross-sectional view of a connecting portion between the end plate and the frame before assembling the electrical equipment. FIG. 4B is a schematic cross-sectional view of a connecting portion between the end plate and the frame after assembling the electrical equipment. FIG. 5 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the present embodiment. FIG. 4A shows a cross section of a connecting portion between the end plate 30 and the frame 20 before the load 200 is attached. FIG. 4B shows a cross section of a connecting portion between the end plate 30 and the frame 20 after the load 200 is attached. In FIGS. 4A, 4B, and 5, cross sections of parts of the load 200, the frame 20, and the end plate 30 are also shown.
　図３に示すように、シールリング８０の３つのリップ８０ａ～８０ｃは、第４リップ８０ｄよりも断面積、言い換えると体積が大きくなるように形成されている。 As shown in FIG. 3, the three lips 80a to 80c of the seal ring 80 are formed so that the cross-sectional area, in other words, the volume is larger than that of the fourth lip 80d.
　図４Ａに示すように、環状の開放空間Ｓにシールリング８０が収容される。このとき、第１リップ８０ａは第１コーナー部Ｃ１に、第４リップ８０ｄは第４コーナー部Ｃ４にそれぞれ押し付けられており、変形している。また、第２及び第３リップ８０ｂ，８０ｃは、それぞれ環状の開放空間Ｓの上面よりも上方、つまり、負荷２００側に長さＡだけ突出している。 As shown in FIG. 4A, the seal ring 80 is housed in the annular open space S. At this time, the first lip 80a is pressed against the first corner portion C1 and the fourth lip 80d is pressed against the fourth corner portion C4, respectively, and is deformed. Further, the second and third lips 80b and 80c each project above the upper surface of the annular open space S, that is, to the load 200 side by the length A.
　また、図４Ｂに示すように、モータ１００に対して負荷２００が組み付けられると、負荷２００の表面２２１が第２及び第３リップ８０ｂ，８０ｃにそれぞれ当接して、シールリング８０を下側に押圧する。このことにより、第２及び第３リップ８０ｂ，８０ｃは、環状の開放空間Ｓの内部に押し込められるように変形する。このとき、第１～第４リップ８０ａ～８０ｄには元の形状に戻ろうとする復元力が発生する。この復元力により、第１～第４コーナー部Ｃ１～Ｃ４に当接された第１～第４リップ８０ａ～８０ｄが、第１～第４コーナー部Ｃ１～Ｃ４をそれぞれ押圧し、フレーム２０とエンドプレート３０との連結部分、及びフレーム２０と負荷２００の表面２２１との連結部分等がシールされる。 Further, as shown in FIG. 4B, when the load 200 is assembled to the motor 100, the surface 221 of the load 200 comes into contact with the second and third lips 80b and 80c, respectively, and presses the seal ring 80 downward. To do. As a result, the second and third lips 80b and 80c are deformed so as to be pushed into the annular open space S. At this time, a restoring force that tries to return to the original shape is generated in the first to fourth lips 80a to 80d. Due to this restoring force, the first to fourth lips 80a to 80d abutting on the first to fourth corner portions C1 to C4 press the first to fourth corner portions C1 to C4, respectively, and the frame 20 and the end The connecting portion with the plate 30 and the connecting portion between the frame 20 and the surface 221 of the load 200 are sealed.
　このようにすることで、フレーム２０の内部への水分等の進入を確実に防止することができる。図５を用いてさらに説明する。 By doing so, it is possible to reliably prevent the ingress of moisture and the like into the inside of the frame 20. This will be further described with reference to FIG.
　図５の上側に示すように、負荷２００の表面２２１がシールリング８０の第２及び第３リップ８０ｂ，８０ｃにそれぞれ当接して、シールリング８０を下側に押圧する。図５の下側に示すように、熱クリープにより、負荷２００は軸受保持部３４に収容された軸受４１を介して、エンドプレート３０の中央部をさらに下側に押圧する。 As shown on the upper side of FIG. 5, the surface 221 of the load 200 abuts on the second and third lips 80b and 80c of the seal ring 80, respectively, and presses the seal ring 80 downward. As shown on the lower side of FIG. 5, by thermal creep, the load 200 further lowers the central portion of the end plate 30 via the bearing 41 housed in the bearing holding portion 34.
　この状態から熱クリープによりエンドプレート３０の外周側が上方に持ち上げられるように変形すると、第１～第４コーナー部Ｃ１～Ｃ４での第１～第４リップ８０ａ～８０ｄの接面圧力がそれぞれ低くなってくることは、図２に示す場合と同様である。 When the outer peripheral side of the end plate 30 is deformed from this state so as to be lifted upward by thermal creep, the contact pressures of the first to fourth lips 80a to 80d at the first to fourth corner portions C1 to C4 become lower, respectively. It is the same as the case shown in FIG.
　一方、第１～第３リップ８０ａ～８０ｃは、第４リップ８０ｄよりも断面積が大きくなるように形成されている。つまり、第１～第３コーナー部Ｃ１～Ｃ３におけるシールリング８０の接面圧力は、第４コーナー部Ｃ４における接面圧力よりも高くなっている。このため、熱クリープによる第１～第３コーナー部Ｃ１～Ｃ３でのシールリング８０の接面圧力の低下は相殺されて、第１～第３コーナー部Ｃ１～Ｃ３における気密性は維持される。このことにより、フレーム２０の内部への水分等の進入を防止することができる。なお、第４コーナー部Ｃ４は、エンドプレート３０のみで構成されるため、フレーム２０とエンドプレート３０との間の気密性や、フレーム２０と負荷２００との間の気密性に直接は寄与しない。よって、第４コーナー部Ｃ４で、シールリング８０の接面圧力が低下しても、フレーム２０の内部への水分等の進入の影響は小さい。 On the other hand, the first to third lips 80a to 80c are formed so that the cross-sectional area is larger than that of the fourth lip 80d. That is, the contact pressure of the seal ring 80 at the first to third corners C1 to C3 is higher than the contact pressure at the fourth corner C4. Therefore, the decrease in the contact surface pressure of the seal ring 80 at the first to third corner portions C1 to C3 due to thermal creep is offset, and the airtightness at the first to third corner portions C1 to C3 is maintained. This makes it possible to prevent moisture and the like from entering the inside of the frame 20. Since the fourth corner portion C4 is composed of only the end plate 30, it does not directly contribute to the airtightness between the frame 20 and the end plate 30 and the airtightness between the frame 20 and the load 200. Therefore, even if the contact pressure of the seal ring 80 decreases at the fourth corner portion C4, the influence of moisture or the like entering the inside of the frame 20 is small.
　［効果等］
　以上説明したように、本実施形態に係るモータ１００は、一端が開口された有底筒状のフレーム２０と、フレーム２０内に収容された固定子６０と、フレーム２０内に収容され、固定子６０と所定の間隔をあけて配置された回転子５０と、フレーム２０の開口２１にこの開口２１を覆うように配設された、樹脂製の板状部材であるエンドプレート３０と、を備えている。エンドプレート３０の中心には、回転軸５４が挿通される貫通孔３２が設けられている。 [Effects, etc.]
As described above, the motor 100 according to the present embodiment has a bottomed tubular frame 20 having one end opened, a stator 60 housed in the frame 20, and a stator housed in the frame 20. A rotor 50 arranged at a predetermined interval from the 60, and an end plate 30 which is a resin plate-like member arranged so as to cover the opening 21 in the opening 21 of the frame 20 are provided. There is. A through hole 32 through which the rotating shaft 54 is inserted is provided in the center of the end plate 30.
　また、モータ１００は、環状の弾性体からなり、フレーム２０の内部の気密を保つためのシールリング８０を備えており、エンドプレート３０の外面の外周部に形成された段差３６とフレーム２０の内周面２３との間に環状の開放空間Ｓが区画形成され、シールリング８０が環状の開放空間Ｓに収容されている。 Further, the motor 100 is made of an annular elastic body, includes a seal ring 80 for maintaining airtightness inside the frame 20, and has a step 36 formed on the outer peripheral portion of the outer surface of the end plate 30 and the inside of the frame 20. An annular open space S is formed between the peripheral surface 23 and the seal ring 80, and the seal ring 80 is housed in the annular open space S.
　シールリング８０は断面がＸ字形状で、４つのリップ８０ａ～８０ｄを有しており、第４リップ８０ｄは段差３６の角部に当接している。言い換えると、第４リップ８０ｄはエンドプレート３０のみに当接している。第１～第３リップ８０ａ～８０ｃは、第４リップ８０ｄよりも断面積が大きい。 The seal ring 80 has an X-shaped cross section and has four lips 80a to 80d, and the fourth lip 80d is in contact with the corner of the step 36. In other words, the fourth lip 80d is in contact with only the end plate 30. The first to third lips 80a to 80c have a larger cross-sectional area than the fourth lip 80d.
　モータ１００をこのように構成することで、外部からの水分等の進入経路にあたる第１～第３コーナー部Ｃ１～Ｃ３に対して、第１～第３リップ８０ａ～８０ｃの接面圧力をそれぞれ高められる。これにより、フレーム２０の内部や負荷２００の内部への水分等の進入を確実に防止できる。 By configuring the motor 100 in this way, the contact pressures of the first to third lips 80a to 80c are increased with respect to the first to third corner portions C1 to C3, which correspond to the entry path of moisture and the like from the outside. Be done. As a result, it is possible to reliably prevent moisture and the like from entering the inside of the frame 20 and the inside of the load 200.
　また、シールリング８０の断面をＸ字形状とすることで、シールリング８０の設置面である段差３６の底面３８に対してシールリング８０が２箇所、この場合は、第１リップ８０ａと第４リップ８０ｄとが当接するため、環状の開放空間Ｓ内でのシールリング８０の位置を安定にすることができる。 Further, by forming the cross section of the seal ring 80 into an X shape, there are two seal rings 80 with respect to the bottom surface 38 of the step 36 which is the installation surface of the seal ring 80. In this case, the first lip 80a and the fourth lip 80a and the fourth. Since the lip 80d comes into contact with the lip 80d, the position of the seal ring 80 in the annular open space S can be stabilized.
　また、シールリング８０の断面をＸ字形状とすることで、シールリング８０を環状の開放空間Ｓに収容した時のねじれを少なくできる。接面圧力がシールリング８０の断面全体に分散されるため、漏れが少なく良好な気密性が得られる。 Further, by making the cross section of the seal ring 80 X-shaped, it is possible to reduce the twist when the seal ring 80 is housed in the annular open space S. Since the contact surface pressure is dispersed over the entire cross section of the seal ring 80, there is little leakage and good airtightness can be obtained.
　また、第４リップ８０ｄの断面積を他のリップ８０ａ～８０ｃよりも小さくすることで、シールリング８０自体の体積が大きくなりすぎるのを抑制できる。シールリング８０の体積が大きくなりすぎると、モータ１００に負荷２００が取り付けられたときに、シールリング８０が異常変形して、かえって気密性を保てないことがある。本実施形態のシールリング８０を用いることで、このような不具合の発生を回避できる。 Further, by making the cross-sectional area of the fourth lip 80d smaller than that of the other lips 80a to 80c, it is possible to prevent the volume of the seal ring 80 itself from becoming too large. If the volume of the seal ring 80 becomes too large, the seal ring 80 may be abnormally deformed when the load 200 is attached to the motor 100, and the airtightness may not be maintained. By using the seal ring 80 of the present embodiment, it is possible to avoid the occurrence of such a problem.
　本実施形態に係る電気機器３００は、モータ１００と、モータ１００に連結され、エンドプレート３０の外側に貫通孔３２から突出した回転軸５４に駆動連結されていて、モータ１００の回転に応じて駆動される被駆動部２１０を有する負荷２００と、を少なくとも備えている。 The electric device 300 according to the present embodiment is connected to the motor 100 and the motor 100, and is driven and connected to the rotating shaft 54 protruding from the through hole 32 to the outside of the end plate 30, and is driven according to the rotation of the motor 100. It includes at least a load 200 having a driven portion 210 to be driven.
　シールリング８０は、負荷２００の表面２２１からフレーム２０の底部側に押圧されることで、第１リップ８０ａが段差３６の底面３８とフレーム２０の内周面２３とで構成される第１コーナー部Ｃ１に、第２リップ８０ｂが負荷２００の表面２２１とフレーム２０の内周面２３とで構成される第２コーナー部Ｃ２に、第３リップ８０ｃが負荷２００の表面２２１と段差３６の側面３７とで構成される第３コーナー部Ｃ３に、第４リップ８０ｄが段差３６の角部である第４コーナー部Ｃ４にそれぞれ当接している。 The seal ring 80 is pressed from the surface 221 of the load 200 toward the bottom of the frame 20, so that the first lip 80a is a first corner portion formed by the bottom surface 38 of the step 36 and the inner peripheral surface 23 of the frame 20. In C1, the second lip 80b is on the second corner portion C2 composed of the surface 221 of the load 200 and the inner peripheral surface 23 of the frame 20, and the third lip 80c is on the surface 221 of the load 200 and the side surface 37 of the step 36. The fourth lip 80d is in contact with the third corner portion C3 composed of the above, and the fourth lip 80d is in contact with the fourth corner portion C4, which is the corner portion of the step 36.
　電気機器３００をこのように構成することで、モータ１００が駆動し、また負荷２００の被駆動部２１０が動作する際に継続して発生する熱及びエンドプレート３０に加わる圧力に起因してエンドプレート３０が変形した場合にも、フレーム２０の内部や負荷２００の内部への水分等の進入を防止できる。これによって、高信頼性の電気機器３００を実現できる。特に、シールリング８０の断面をＸ字形状とし、かつ第１～第３リップ８０ａ～８０ｃのそれぞれの断面積を、第４リップ８０ｄの断面積よりも大きくすることで、外部からの水分等の進入経路にあたる第１～第３コーナー部Ｃ１～Ｃ３に対して、第１～第３リップ８０ａ～８０ｃの接面圧力をそれぞれ高められ、フレーム２０の内部や負荷２００の内部への水分等の進入を確実に防止できる。 By configuring the electric device 300 in this way, the end plate is caused by the heat continuously generated when the motor 100 is driven and the driven portion 210 of the load 200 is operated and the pressure applied to the end plate 30. Even when the 30 is deformed, it is possible to prevent moisture and the like from entering the inside of the frame 20 and the inside of the load 200. Thereby, a highly reliable electric device 300 can be realized. In particular, by making the cross section of the seal ring 80 X-shaped and making the cross-sectional area of each of the first to third lips 80a to 80c larger than the cross-sectional area of the fourth lip 80d, moisture from the outside and the like can be prevented. The contact pressure of the first to third lips 80a to 80c is increased with respect to the first to third corner portions C1 to C3 corresponding to the approach path, and moisture or the like enters the inside of the frame 20 or the load 200, respectively. Can be reliably prevented.
　また、本実施形態の電気機器３００は、外部環境に配設され、環境温度が数十度以上に達した状態で継続使用される場合に高信頼性を確保でき、有用である。 Further, the electric device 300 of the present embodiment is useful because it can ensure high reliability when it is arranged in an external environment and is continuously used in a state where the environmental temperature reaches several tens of degrees or more.
　以上のように、本実施形態のモータ１００は、一端が開口された有底筒状のフレーム２０と、フレーム２０内に収容された固定子６０と、フレーム２０内に収容され、固定子６０と所定の間隔をあけて配置された回転子５０と、フレーム２０の開口２１に開口２１を覆うように配設され、回転軸５４が挿通される貫通孔３２が中心に設けられた板状部材であるエンドプレート３０と、環状の弾性体からなり、フレーム２０の内部の気密を保つためのシールリング８０と、を少なくとも備える。エンドプレート３０の外面の外周部に形成された段差３６とフレーム２０の内周面２３との間には、環状の開放空間Ｓが区画形成され、シールリング８０が開放空間に収容されている。シールリング８０は断面がＸ字形状で第１～第４リップ８０ａ～８０ｄを有している。第４リップ８０ｄは段差３６の角部に当接している。第１～第３リップ８０ａ～８０ｃのうちの少なくとも１つは、第４リップ８０ｄよりも断面積が大きい。 As described above, the motor 100 of the present embodiment includes a bottomed tubular frame 20 having one end opened, a stator 60 housed in the frame 20, and a stator 60 housed in the frame 20. A plate-shaped member having rotors 50 arranged at predetermined intervals and a through hole 32 arranged in the opening 21 of the frame 20 so as to cover the opening 21 and through which the rotation shaft 54 is inserted. At least a certain end plate 30 and a seal ring 80 made of an annular elastic body and for maintaining airtightness inside the frame 20 are provided. An annular open space S is partitioned between the step 36 formed on the outer peripheral portion of the outer surface of the end plate 30 and the inner peripheral surface 23 of the frame 20, and the seal ring 80 is housed in the open space. The seal ring 80 has an X-shaped cross section and has first to fourth lips 80a to 80d. The fourth lip 80d is in contact with the corner of the step 36. At least one of the first to third lips 80a to 80c has a larger cross-sectional area than the fourth lip 80d.
　この構成によれば、フレーム２０の内周面２３を含む開放空間のコーナー部でのシールリング８０の接面圧力を高くすることができる。モータ１００の回転軸５４に負荷２００が連結された場合、この負荷２００とフレーム２０の内周面２３とで構成されるコーナー部でのシールリング８０の接面圧力を高くすることができる。このことにより、エンドプレート３０が熱または圧力の影響で変形した場合にもコーナー部Ｃ１～Ｃ４での気密性を維持して、フレーム２０の内部への水分等の進入を防止できる。これにより、高信頼性のモータ１００を実現できる。 According to this configuration, the contact pressure of the seal ring 80 at the corner portion of the open space including the inner peripheral surface 23 of the frame 20 can be increased. When the load 200 is connected to the rotating shaft 54 of the motor 100, the contact pressure of the seal ring 80 at the corner portion formed by the load 200 and the inner peripheral surface 23 of the frame 20 can be increased. As a result, even when the end plate 30 is deformed due to the influence of heat or pressure, the airtightness at the corners C1 to C4 can be maintained and moisture or the like can be prevented from entering the inside of the frame 20. Thereby, a highly reliable motor 100 can be realized.
　また、本実施形態の電気機器３００は、モータ１００と、モータ１００に連結され、エンドプレート３０の外側に貫通孔３２から突出した回転軸５４に駆動連結されていて、モータ１００の回転に応じて駆動される被駆動部２１０を有する負荷２００と、を少なくとも備える。シールリング８０は、負荷２００の表面からフレーム２０の底部側に押圧されることで、第１リップ８０ａが段差の底面３８とフレーム２０の内周面とで構成される第１コーナー部に、第２リップ８０ｂが負荷２００の表面とフレーム２０の内周面２３とで構成される第２コーナー部に、第３リップ８０ｃが負荷２００の表面と段差の側面３７とで構成される第３コーナー部に、第４リップ８０ｄが段差３６の角部である第４コーナー部にそれぞれ当接している。 Further, the electric device 300 of the present embodiment is connected to the motor 100 and the motor 100, and is driven and connected to the rotating shaft 54 protruding from the through hole 32 to the outside of the end plate 30, and is driven and connected according to the rotation of the motor 100. It includes at least a load 200 having a driven portion 210 to be driven. When the seal ring 80 is pressed from the surface of the load 200 toward the bottom of the frame 20, the first lip 80a is placed on the first corner portion formed by the bottom surface 38 of the step and the inner peripheral surface of the frame 20. The 2 lip 80b is the second corner portion composed of the surface of the load 200 and the inner peripheral surface 23 of the frame 20, and the third lip 80c is the third corner portion composed of the surface of the load 200 and the side surface 37 of the step. The fourth lip 80d is in contact with the fourth corner portion, which is the corner portion of the step 36, respectively.
　この構成によれば、シールリング８０の断面をＸ字形状とすることで、外部からの水分等の進入経路にあたる第１～第３コーナー部Ｃ１～Ｃ３に対して、第１～第３リップ８０ａ～８０ｃがそれぞれ所定の接面圧力で当接する。よって、フレーム２０の内部または負荷の内部への水分等の進入を確実に防止できる。これにより、高信頼性の電気機器３００を実現できる。 According to this configuration, by forming the cross section of the seal ring 80 into an X shape, the first to third lips 80a with respect to the first to third corner portions C1 to C3 which correspond to the entry path of moisture and the like from the outside. -80c come into contact with each other at a predetermined contact pressure. Therefore, it is possible to reliably prevent the ingress of moisture or the like into the inside of the frame 20 or the inside of the load. As a result, a highly reliable electric device 300 can be realized.
　＜変形例１＞
　図６は、変形例１に係るシールリングの断面模式図である。図７は、変形例１に係るエンドプレートとフレームとの連結部分の断面模式図である。図８は、変形例１に係る別のシールリングの断面模式図である。図９は、変形例１に係るエンドプレートとフレームとの別の連結部分の断面模式図である。なお、図６～図９において、実施形態１と同様の個所については同一の符号を付して詳細な説明を省略する。 <Modification example 1>
FIG. 6 is a schematic cross-sectional view of the seal ring according to the first modification. FIG. 7 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the first modification. FIG. 8 is a schematic cross-sectional view of another seal ring according to the first modification. FIG. 9 is a schematic cross-sectional view of another connecting portion between the end plate and the frame according to the first modification. In FIGS. 6 to 9, the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
　図６に示すシールリング８１は、第１及び第２リップ８１ａ，８１ｂの断面積が第４リップ８１ｄの断面積よりも大きくなるようにそれぞれ形成されている。前述したように、第１及び第２リップ８１ａ，８１ｂは、第１及び第２コーナー部Ｃ１，Ｃ２にそれぞれ当接し、第１及び第２コーナー部Ｃ１，Ｃ２はフレーム２０の内周面２３をそれぞれ含んでいる。 The seal ring 81 shown in FIG. 6 is formed so that the cross-sectional areas of the first and second lips 81a and 81b are larger than the cross-sectional areas of the fourth lip 81d, respectively. As described above, the first and second lips 81a and 81b abut on the first and second corner portions C1 and C2, respectively, and the first and second corner portions C1 and C2 touch the inner peripheral surface 23 of the frame 20. Each is included.
　シールリング８１をこのように構成することで、第１及び第２コーナー部Ｃ１，Ｃ２でのシールリング８１の接面圧力を高めることができる。 By configuring the seal ring 81 in this way, it is possible to increase the contact pressure of the seal ring 81 at the first and second corner portions C1 and C2.
　エンドプレート３０の熱変形により、第２コーナー部Ｃ２において、フレーム２０の内周面２３と負荷２００の表面２２１との隙間が大きくなることは前述のとおりである。このため、外部からの水分等の進入が最も起こりやすいのは第２コーナー部Ｃ２である。一方、フレーム２０の内部に水分等が直接進入する経路は第１コーナー部Ｃ１である。よって、第１コーナー部Ｃ１での気密性も高める必要がある。 As described above, the gap between the inner peripheral surface 23 of the frame 20 and the surface 221 of the load 200 increases in the second corner portion C2 due to the thermal deformation of the end plate 30. For this reason, it is the second corner portion C2 that is most likely to allow moisture or the like to enter from the outside. On the other hand, the path through which moisture or the like directly enters the inside of the frame 20 is the first corner portion C1. Therefore, it is necessary to improve the airtightness at the first corner portion C1.
　図６に示すシールリング８１を用いることで、図７に示す第１及び第２コーナー部Ｃ１，Ｃ２でのシールリング８１の接面圧力を高めることができ、フレーム２０の内部や負荷２００の内部への水分等の進入を確実に防止できる。なお、第３リップ８１ｃの断面積を第４リップ８１ｄの断面積と同等にすることで、シールリング８１自体の体積を小さくして、シールリング８１が異常変形するのを抑制できる。このことにより、フレーム２０の内部や負荷２００の内部の気密性を高めることができる。 By using the seal ring 81 shown in FIG. 6, the contact surface pressure of the seal ring 81 at the first and second corner portions C1 and C2 shown in FIG. 7 can be increased, and the inside of the frame 20 and the inside of the load 200 can be increased. It is possible to reliably prevent the ingress of moisture and the like into the water. By making the cross-sectional area of the third lip 81c equal to the cross-sectional area of the fourth lip 81d, the volume of the seal ring 81 itself can be reduced, and abnormal deformation of the seal ring 81 can be suppressed. As a result, the airtightness inside the frame 20 and the inside of the load 200 can be improved.
　前述したように、フレーム２０の上端部は、径方向外側に屈曲したフランジ２５である。よって、単に第２リップ８１ｂの断面積を大きくするだけでは第２リップ８１ｂが第２コーナー部Ｃ２をシールしきれず、第２コーナー部Ｃ２での気密性を保てない場合がある。 As described above, the upper end portion of the frame 20 is a flange 25 bent outward in the radial direction. Therefore, if the cross-sectional area of the second lip 81b is simply increased, the second lip 81b may not be able to completely seal the second corner portion C2, and the airtightness at the second corner portion C2 may not be maintained.
　図８に示すように、第２リップ８２ｂの形状をフレーム２０のフランジ２５の内周面２３に沿うような形状とすることで、図９に示す第２コーナー部Ｃ２での気密性を確実に維持することができる。したがって、フレーム２０の内部や負荷２００の内部への水分等の進入を確実に防止できる。 As shown in FIG. 8, by making the shape of the second lip 82b along the inner peripheral surface 23 of the flange 25 of the frame 20, the airtightness at the second corner portion C2 shown in FIG. 9 is ensured. Can be maintained. Therefore, it is possible to reliably prevent the ingress of moisture and the like into the inside of the frame 20 and the inside of the load 200.
　なお、第１～第３リップ８１ａ～８１ｃ、８２ａ～８２ｃのうちの少なくとも１つの断面積を第４リップ８１ｄ、８２ｄの断面積より大きくするようにしてもよい。モータ１００または負荷２００のサイズ、また、エンドプレート３０の変形の度合いによっては、第１～第３リップ８１ａ～８１ｃ、８２ａ～８２ｃのうちのいずれ１つあるいは複数を第４リップ８１ｄ、８２ｄよりも断面積が大きくなるようにすることで、フレーム２０の内部や負荷２００の内部への水分等の進入を防止することも可能である。 The cross-sectional area of at least one of the first to third lips 81a to 81c and 82a to 82c may be made larger than the cross-sectional area of the fourth lips 81d and 82d. Depending on the size of the motor 100 or the load 200 and the degree of deformation of the end plate 30, any one or more of the first to third lips 81a to 81c and 82a to 82c may be used more than the fourth lips 81d and 82d. By increasing the cross-sectional area, it is possible to prevent moisture and the like from entering the inside of the frame 20 and the load 200.
　（実施形態２）
　図１０Ａは、本発明の実施形態２に係るエンドプレートとフレームとの連結部分の断面模式図である。図１０Ｂは、本発明の実施形態２に係るエンドプレートとフレームとの連結部分の断面模式図である。図１１は、本発明の実施形態２に係るエンドプレートとシールリングとの経時変形を説明する模式図である。なお、図１０Ａでは、環状の開放空間Ｓにシールリング８０が収容されていない状態を示す。図１０Ｂでは、シールリング８０が収容された状態を示す。 (Embodiment 2)
FIG. 10A is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention. FIG. 10B is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second embodiment of the present invention. FIG. 11 is a schematic view illustrating the time-dependent deformation of the end plate and the seal ring according to the second embodiment of the present invention. Note that FIG. 10A shows a state in which the seal ring 80 is not housed in the annular open space S. FIG. 10B shows a state in which the seal ring 80 is housed.
　図１～図４Ｂに示したエンドプレート３０では、段差３６の底面３８は平坦面であり、かつ段差３６の側面３７と互いに直交するように形成されている。本実施形態において、段差３６の底面３８は、径方向外側に位置する第１底面３８ａと、径方向内側に位置し、段差３６の側面３７及び第１底面３８ａに連続する第２底面３８ｂとを含んでいる。第１底面３８ａと第２底面３８ｂとは軸方向に関して互いに異なる方向に傾斜している。第１底面３８ａは、エンドプレート３０の外面の径方向外縁まで延びかつ径方向外側に向かって下側、つまりフレーム２０の底部側に向かうように傾斜している。言い換えると、エンドプレート３０の外面の外周部は、下側に向かう順テーパー形状となっている。段差３６の側面３７と第２底面３８ｂとは互いに直交している。軸方向での断面視において、第１底面３８ａが第２底面３８ｂに対して所定の傾斜角で傾斜する面となるようにしているが、特にこれに限定されない。この傾斜角は、底面３８の径方向の幅、環状の開放空間Ｓの軸方向の高さ、環状の開放空間Ｓに対するシールリング８０の充填率、シールリング８０の材質あるいはシールリング８０の第１リップ８０ａの曲率半径等により適宜変更され得る。 In the end plates 30 shown in FIGS. 1 to 4B, the bottom surface 38 of the step 36 is a flat surface and is formed so as to be orthogonal to the side surface 37 of the step 36. In the present embodiment, the bottom surface 38 of the step 36 includes a first bottom surface 38a located on the outer side in the radial direction and a second bottom surface 38b located on the inner side in the radial direction and continuous with the side surface 37 and the first bottom surface 38a of the step 36. Includes. The first bottom surface 38a and the second bottom surface 38b are inclined in different directions with respect to the axial direction. The first bottom surface 38a extends to the radial outer edge of the outer surface of the end plate 30 and is inclined downward toward the radial outer side, that is, toward the bottom side of the frame 20. In other words, the outer peripheral portion of the outer surface of the end plate 30 has a forward taper shape toward the lower side. The side surface 37 of the step 36 and the second bottom surface 38b are orthogonal to each other. In the cross-sectional view in the axial direction, the first bottom surface 38a is set to be a surface that is inclined at a predetermined inclination angle with respect to the second bottom surface 38b, but the present invention is not particularly limited to this. The inclination angle is the radial width of the bottom surface 38, the axial height of the annular open space S, the filling rate of the seal ring 80 with respect to the annular open space S, the material of the seal ring 80, or the first seal ring 80. It can be appropriately changed depending on the radius of curvature of the lip 80a and the like.
　図１０Ａ及び図１０Ｂに示す場合では、軸方向の断面視において、エンドプレート３０の外面の径方向外縁部を直線状に切り欠いた形状とすることで、第１底面３８ａが形成されている。言い換えると、第１底面３８ａは、その径方向外縁部が径方向内側部の延長上にまで直線状に延びる傾斜面となっている。従って、軸方向での断面視において、第１コーナー部Ｃ１は鋭角をなすように構成されている。なお、実際には、エンドプレート３０は金型を用いて一体成形された樹脂製の部材であり、角部の切欠き加工等は行われない。また、第１底面３８ａは、径方向の幅Ｌ１が段差３６の底面３８の径方向の幅Ｌの半分以下になるように形成されている。 In the cases shown in FIGS. 10A and 10B, the first bottom surface 38a is formed by forming the radial outer edge portion of the outer surface of the end plate 30 in a straight line in a cross-sectional view in the axial direction. In other words, the first bottom surface 38a is an inclined surface whose radial outer edge portion extends linearly over the extension of the radial inner portion. Therefore, the first corner portion C1 is configured to form an acute angle in the cross-sectional view in the axial direction. In reality, the end plate 30 is a resin member integrally molded using a mold, and the corners are not cut out. Further, the first bottom surface 38a is formed so that the radial width L1 is less than half of the radial width L of the bottom surface 38 of the step 36.
　図１０Ｂに示すように、負荷２００が下側のモータ１００を押圧していない状態で、シールリング８０は、軸方向の突出高さＡが、第１底面３８ａの軸方向の高さＢよりも大きくなるように環状の開放空間Ｓに収容される。 As shown in FIG. 10B, in a state where the load 200 does not press the lower motor 100, the protrusion height A in the axial direction of the seal ring 80 is larger than the height B in the axial direction of the first bottom surface 38a. It is housed in an annular open space S so as to be large.
　このようにシールリング８０が配設されたモータ１００に対して負荷２００が組み付けられると、図１１の上側に示すように、負荷２００の表面２２１がシールリング８０を下側に押圧して、第１～第４リップ８０ａ～８０ｄが、第１～第４コーナー部Ｃ１～Ｃ４にそれぞれ当接する。このことにより、フレーム２０とエンドプレート３０との連結部分、及びフレーム２０と負荷２００の表面２２１との連結部分等がシールされることは前述のとおりである。 When the load 200 is assembled to the motor 100 on which the seal ring 80 is arranged in this way, the surface 221 of the load 200 presses the seal ring 80 downward as shown in the upper side of FIG. The 1st to 4th lips 80a to 80d come into contact with the 1st to 4th corner portions C1 to C4, respectively. As described above, the connecting portion between the frame 20 and the end plate 30 and the connecting portion between the frame 20 and the surface 221 of the load 200 are sealed by this.
　ここで、段差３６の第１底面３８ａが上記の傾斜面である一方、第２底面３８ｂは第１底面３８ａと異なる方向に傾斜し、段差３６の側面３７と互いに直交している。負荷２００の表面２２１に当接したシールリング８０が下側に押圧された場合、第４コーナー部Ｃ４での第４リップ８０ｄの変形量及び接面圧力は図４Ｂに示す場合と同様である。一方、第１コーナー部Ｃ１は、図４Ｂに示す場合よりも下方、つまり、フレーム２０の底部側に延びる空間体積が大きくなっている。かつ、第１リップ８０ａは傾斜面である第１底面３８ａに沿って変位可能である。これにより、図１０Ｂに示すように、シールリング８０の第１リップ８０ａが変形して第１コーナー部Ｃ１に入り込む量が、図４Ｂに示す場合よりも大きくなる。この入り込み量の増加に応じて、第１コーナー部Ｃ１でのシールリング８０の接面圧力は図４Ｂに示す場合よりも高くなる。この状態から熱クリープによりエンドプレート３０の外周側が上方に持ち上げられるように変形すると、第１コーナー部Ｃ１において、第１リップ８０ａがフレーム２０の内周面２３を押圧する接面圧力が低くなってくることは、図４Ｂに示す場合と同様である。しかし、本実施形態では、上述の通り、第１コーナー部Ｃ１におけるシールリング８０の接面圧力が予め高い状態になっている。このため、上述した第１コーナー部Ｃ１でのシールリング８０の接面圧力の低下を十分にカバーして、フレーム２０の内部への水分等の進入を防止することができる。 Here, the first bottom surface 38a of the step 36 is the above-mentioned inclined surface, while the second bottom surface 38b is inclined in a direction different from that of the first bottom surface 38a and is orthogonal to the side surface 37 of the step 36. When the seal ring 80 in contact with the surface 221 of the load 200 is pressed downward, the amount of deformation and the contact surface pressure of the fourth lip 80d at the fourth corner portion C4 are the same as in the case shown in FIG. 4B. On the other hand, the first corner portion C1 has a larger space volume extending downward, that is, toward the bottom side of the frame 20 than in the case shown in FIG. 4B. Moreover, the first lip 80a can be displaced along the first bottom surface 38a which is an inclined surface. As a result, as shown in FIG. 10B, the amount by which the first lip 80a of the seal ring 80 is deformed and enters the first corner portion C1 becomes larger than that shown in FIG. 4B. As the amount of penetration increases, the contact pressure of the seal ring 80 at the first corner portion C1 becomes higher than that shown in FIG. 4B. When the outer peripheral side of the end plate 30 is deformed so as to be lifted upward by thermal creep from this state, the contact pressure at which the first lip 80a presses the inner peripheral surface 23 of the frame 20 becomes low in the first corner portion C1. It is the same as the case shown in FIG. 4B. However, in the present embodiment, as described above, the contact pressure of the seal ring 80 at the first corner portion C1 is in a high state in advance. Therefore, it is possible to sufficiently cover the decrease in the contact surface pressure of the seal ring 80 at the first corner portion C1 described above and prevent moisture or the like from entering the inside of the frame 20.
　以上、説明したように、本実施形態に係るモータ１００では、フレーム２０の開口２１を覆う樹脂製のエンドプレート３０の外面の外周部に段差３６を形成する。段差３６の底面３８のうち、径方向外側に位置する第１底面３８ａは、エンドプレート３０の外面の径方向外縁まで延びかつ径方向外側に向かって下側、つまりフレーム２０の底部側に向かうように傾斜している。 As described above, in the motor 100 according to the present embodiment, a step 36 is formed on the outer peripheral portion of the outer surface of the resin end plate 30 that covers the opening 21 of the frame 20. Of the bottom surface 38 of the step 36, the first bottom surface 38a located on the outer side in the radial direction extends to the radial outer edge of the outer surface of the end plate 30 and is directed downward toward the outer side in the radial direction, that is, toward the bottom side of the frame 20. It is inclined to.
　このような構成とすることで、シールリング８０に上方から下方に向かう押圧力を加えた場合に、第１コーナー部Ｃ１において、シールリング８０の入り込み量が増加して、シールリング８０の接面圧力を高くすることができる。このことにより、フレーム２０の内部に水分等が直接進入する経路である第１コーナー部Ｃ１での気密性を維持して、高信頼性のモータ１００を実現できる。 With such a configuration, when a pressing force is applied to the seal ring 80 from above to downward, the amount of penetration of the seal ring 80 increases at the first corner portion C1, and the contact surface of the seal ring 80 is increased. The pressure can be increased. As a result, the highly reliable motor 100 can be realized by maintaining the airtightness at the first corner portion C1 which is a path through which moisture or the like directly enters the inside of the frame 20.
　また、第１底面３８ａの径方向の幅Ｌ１を底面３８の径方向の幅Ｌの半分以下になるようにすることで、第１コーナー部Ｃ１において、第１リップ８０ａの径方向での圧縮変形量が小さくなるのを抑制して、フレーム２０の内周面２３への接面圧力を所望の値以上に維持できる。このことにより、エンドプレート３０の熱クリープ変形時にも、第１コーナー部Ｃ１での気密性を維持できる。 Further, by making the radial width L1 of the first bottom surface 38a less than half the radial width L of the bottom surface 38, the first corner portion C1 is compressed and deformed in the radial direction of the first lip 80a. It is possible to suppress the amount from becoming small and maintain the contact pressure of the frame 20 with respect to the inner peripheral surface 23 to a desired value or more. As a result, the airtightness at the first corner portion C1 can be maintained even when the end plate 30 is thermally creep-deformed.
　また、シールリング８０を環状の開放空間Ｓに収容したときに、シールリング８０の軸方向の突出高さＡを第１底面３８ａの軸方向の高さＢよりも大きくする。これにより、環状の開放空間Ｓに対するシールリング８０の充填率の低下を抑制して、シールリング８０による十分な気密性を確保できる。 Further, when the seal ring 80 is housed in the annular open space S, the axial protrusion height A of the seal ring 80 is made larger than the axial height B of the first bottom surface 38a. As a result, it is possible to suppress a decrease in the filling rate of the seal ring 80 with respect to the annular open space S, and to secure sufficient airtightness by the seal ring 80.
　また、シールリング８０の断面をＸ字形状とすることで、環状の開放空間Ｓ内でのシールリング８０の位置を安定にできる。また、ねじれを少なくして、接面圧力がシールリング８０の断面全体に分散されることは実施形態１に示すのと同様である。 Further, by making the cross section of the seal ring 80 X-shaped, the position of the seal ring 80 in the annular open space S can be stabilized. Further, it is the same as that shown in the first embodiment that the contact surface pressure is dispersed over the entire cross section of the seal ring 80 by reducing the twist.
　また、第１底面３８ａは、径方向外縁部から径方向内側部まで直線状に延びる傾斜面であってもよい。 Further, the first bottom surface 38a may be an inclined surface extending linearly from the radial outer edge portion to the radial inner portion.
　＜変形例２＞
　図１２は、変形例２に係るエンドプレートとフレームとの連結部分の断面模式図である。図１３は、変形例２に係るエンドプレートとフレームとの連結部分の別の断面模式図である。なお、図１２，１３において、実施形態１，２と同様の個所については同一の符号を付して詳細な説明を省略する。説明の便宜上、シールリング８０の図示を省略している。 <Modification 2>
FIG. 12 is a schematic cross-sectional view of a connecting portion between the end plate and the frame according to the second modification. FIG. 13 is another schematic cross-sectional view of the connecting portion between the end plate and the frame according to the second modification. In FIGS. 12 and 13, the same parts as those in the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted. For convenience of explanation, the illustration of the seal ring 80 is omitted.
　図１０Ａ，図１０Ｂ，図１１において、軸方向の断面視において、エンドプレート３０の外面の径方向外縁部を直線状に切り欠いた形状とすることで、第１底面３８ａが形成される例を示す。前述のとおり、第１コーナー部Ｃ１において、下方に延びる空間体積を増加させるように、また、第１底面３８ａと第２底面３８ｂとが軸方向に関して互いに異なる方向に傾斜するように第１底面３８ａの形状を決定すればよい。従って、図１２に示すように、エンドプレート３０の外面の径方向外縁部を、径方向外側に向かってフレーム２０の底部側に向かうように湾曲するフィレット形状、つまり、Ｒ面取りされた形状としてもよい。より具体的には、第１底面３８ａの径方向外縁部は、径方向外側に向かってフレーム２０の底部側に向かうように湾曲するフィレット形状、つまり、Ｒ面取りされた形状としてもよい。図１３に示すように、第２底面３８ｂを第１底面３８ａと反対側に傾斜面として、底面３８に凸部が形成されるようにしてもよい。図１３に示す場合に、第１底面３８ａの形状を図１２に示す形状としてもよい。いずれの場合も、第１コーナー部Ｃ１での気密性を維持して、フレーム２０の内部への水分等の進入を防止できる。したがって、高信頼性のモータ１００及び電気機器３００を実現できる。 In FIGS. 10A, 10B, and 11, an example in which the first bottom surface 38a is formed by forming the radial outer edge portion of the outer surface of the end plate 30 in a linear shape in a cross-sectional view in the axial direction. Shown. As described above, in the first corner portion C1, the first bottom surface 38a is such that the space volume extending downward is increased and the first bottom surface 38a and the second bottom surface 38b are inclined in different directions with respect to the axial direction. The shape of the Therefore, as shown in FIG. 12, the radial outer edge of the outer surface of the end plate 30 may be curved outward in the radial direction toward the bottom of the frame 20, that is, an R-chamfered shape. Good. More specifically, the radial outer edge portion of the first bottom surface 38a may have a fillet shape that curves outward in the radial direction toward the bottom side of the frame 20, that is, an R chamfered shape. As shown in FIG. 13, the second bottom surface 38b may be an inclined surface on the opposite side of the first bottom surface 38a, and a convex portion may be formed on the bottom surface 38. In the case shown in FIG. 13, the shape of the first bottom surface 38a may be the shape shown in FIG. In either case, the airtightness at the first corner portion C1 can be maintained to prevent moisture or the like from entering the inside of the frame 20. Therefore, a highly reliable motor 100 and an electric device 300 can be realized.
　（その他の実施形態）
　各変形例及び実施形態１，２に示した各構成要素を適宜組み合わせて新たな実施形態とすることもできる。例えば、変形例１に示すシールリング８１，８２を実施形態２に示すモータ１００に適用することもできる。 (Other embodiments)
Each modification and each component shown in the first and second embodiments can be appropriately combined to form a new embodiment. For example, the seal rings 81 and 82 shown in the first modification can be applied to the motor 100 shown in the second embodiment.
　なお、実施形態２において、エンドプレート３０に形成された段差３６の底面３８は、段差３６の側面３７からエンドプレート３０の外面の径方向外縁まで直線状に延びる傾斜面であってもよい。また、変形例１～３を含む実施形態１，２において、モータ１００がブラシ付きモータである場合を例示した。しかし、特にこれに限定されず、例えば、ブラシレスモータであってもよいし、他の種類のモータであってもよい。また、本実施形態におけるモータ１００は、回転子５０の径方向外側に固定子６０が配置された、いわゆるインナーロータ型のモータに用いる場合について説明した。しかし、別の種類のモータ、例えば、固定子６０の径方向外側に所定の間隔をあけて回転子５０が配置された、いわゆるアウターロータ型のモータにも適用できることは言うまでもない。 In the second embodiment, the bottom surface 38 of the step 36 formed on the end plate 30 may be an inclined surface extending linearly from the side surface 37 of the step 36 to the radial outer edge of the outer surface of the end plate 30. Further, in the first and second embodiments including the first to third modifications, the case where the motor 100 is a brushed motor is illustrated. However, the present invention is not particularly limited to this, and for example, it may be a brushless motor or another type of motor. Further, the case where the motor 100 in the present embodiment is used for a so-called inner rotor type motor in which the stator 60 is arranged on the radial outer side of the rotor 50 has been described. However, it goes without saying that it can be applied to another type of motor, for example, a so-called outer rotor type motor in which rotors 50 are arranged at predetermined intervals on the radial outer side of the stator 60.
　また、エンドプレート３０の貫通孔３２側に配設された軸受４１は軸受保持部３４内に収容されて、エンドプレート３０の外面に当接している。しかし、エンドプレート３０の内面側に配設されて、フレーム２０の内部に収容されていてもよい。 Further, the bearing 41 arranged on the through hole 32 side of the end plate 30 is housed in the bearing holding portion 34 and is in contact with the outer surface of the end plate 30. However, it may be disposed on the inner surface side of the end plate 30 and housed inside the frame 20.
　また、エンドプレート３０と一体に設けられたブラシ保持部３３にブラシ７０を収容するようにした。しかし、ブラシ保持部３３をエンドプレート３０と別体にフレーム２０の内部に設けてブラシ７０を収容するようにしてもよい。 Further, the brush 70 is housed in the brush holding portion 33 provided integrally with the end plate 30. However, the brush holding portion 33 may be provided inside the frame 20 separately from the end plate 30 to accommodate the brush 70.
　また、本実施形態において、固定子６０はフレーム２０と複数の永久磁石６１とで構成されている。しかし、他の構造、例えば、周方向に所定の間隔をあけて配設された複数の界磁磁極のそれぞれに界磁巻線が巻装されて固定子６０を構成するようにしてもよい。 Further, in the present embodiment, the stator 60 is composed of a frame 20 and a plurality of permanent magnets 61. However, another structure, for example, a field winding may be wound around each of a plurality of field magnetic poles arranged at predetermined intervals in the circumferential direction to form the stator 60.
　本発明に係るモータは、外部からの水分や油等の進入を防止できる。したがって、油圧ポンプ等の流体ポンプを含む電気機器や高温の外部環境に配設される電気機器に適用する上で有用である。 The motor according to the present invention can prevent the ingress of moisture, oil, etc. from the outside. Therefore, it is useful for application to electric devices including fluid pumps such as hydraulic pumps and electric devices arranged in a high temperature external environment.
　２０　　フレーム
　２１　　開口
　２２　　軸受保持部
　２３　　内周面
　２４　　プレート支持部
　２５　　フランジ
　３０　　エンドプレート
　３１　　基部
　３２　　貫通孔
　３３　　ブラシ保持部
　３４　　軸受保持部
　３６　　段差
　３７　　段差の側面
　３８　　段差の底面
　３８ａ　第１底面
　３８ｂ　第２底面
　４０，４１　　軸受（ベアリング）
　５０　　回転子
　５１　　電機子コア
　５２　　突極
　５３　　電機子巻線
　５４　　回転軸
　５５　　整流子
　５６　　インシュレータ
　６０　　固定子
　６１　　永久磁石
　７０　　ブラシ
　８０　　シールリング
　８０ａ～８０ｄ　第１～第４リップ
　８１　　シールリング
　８１ａ～８１ｄ　第１～第４リップ
　８２　　シールリング
　８２ａ～８２ｄ　第１～第４リップ
　１００　モータ
　２００　負荷
　２１０　被駆動部
　２２０　外郭
　２２１　負荷の表面（外郭の表面）
　３００　電気機器
　Ｃ１～Ｃ４　第１～第４コーナー部
　Ａ　　　シールリングの突出高さ
　Ｂ　　　第１底面の軸方向の高さ
　Ｓ　　　環状の開放空間 20 Frame 21 Opening 22 Bearing holding part 23 Inner peripheral surface 24 Plate supporting part 25 Flange 30 End plate 31 Base 32 Through hole 33 Brush holding part 34 Bearing holding part 36 Step 37 Step side 38 Step bottom 38a First bottom 38b 2 Bottom 40,41 Bearing (Bearing)
50 Rotor 51 Armature core 52 Slip pole 53 Armature winding 54 Rotor shaft 55 Commutator 56 Insulator 60 Stator 61 Permanent magnet 70 Brush 80 Seal ring 80a-80d 1st-4th lip 81 Seal ring 81a-81d 1st 1st to 4th lip 82 Seal ring 82a to 82d 1st to 4th lip 100 Motor 200 Load 210 Driven part 220 Outer 221 Load surface (outer surface)
300 Electrical equipment C1 to C4 1st to 4th corners A Overhang height of the seal ring B Axial height of the 1st bottom surface S An annular open space

Claims (13)

  1. 一端が開口された有底筒状のフレームと、
    前記フレーム内に収容された固定子と、
    前記フレーム内に収容され、前記固定子と所定の間隔をあけて配置された回転子と、
    前記フレームの開口に前記開口を覆うように配設され、回転軸が挿通される貫通孔が中心に設けられた板状部材であるエンドプレートと、
    環状の弾性体からなり、前記フレームの内部の気密を保つためのシールリングと、を少なくとも備え、
    前記エンドプレートの外面の外周部に形成された段差と前記フレームの内周面との間に環状の開放空間が区画形成され、前記シールリングが前記開放空間に収容されており、
    前記シールリングは断面がＸ字形状で第１～第４リップを有しており、
    前記第４リップは前記段差の角部に当接しており、
    前記第１～第３リップのうちの少なくとも１つは、前記第４リップよりも断面積が大きいモータ。     A bottomed tubular frame with one end open,
    The stator housed in the frame and
    A rotor housed in the frame and arranged at a predetermined distance from the stator,
    An end plate, which is a plate-shaped member arranged in the opening of the frame so as to cover the opening and having a through hole through which a rotation shaft is inserted,
    It is made of an annular elastic body and is provided with at least a seal ring for keeping the inside of the frame airtight.
    An annular open space is formed between the step formed on the outer peripheral portion of the outer surface of the end plate and the inner peripheral surface of the frame, and the seal ring is housed in the open space.
    The seal ring has an X-shaped cross section and has first to fourth lips.
    The fourth lip is in contact with the corner of the step.
    At least one of the first to third lips is a motor having a larger cross-sectional area than the fourth lip.
  2. 前記第１及び第２リップは前記フレームの内周面に当接しており、
    前記第１及び第２リップは、それぞれ前記第４リップよりも断面積が大きい請求項１に記載のモータ。     The first and second lips are in contact with the inner peripheral surface of the frame.
    The motor according to claim 1, wherein the first and second lips each have a larger cross-sectional area than the fourth lip.
  3. 前記フレームにおける前記開口の近傍には、前記モータの半径方向外側に屈曲したフランジが形成されており、
    前記第２リップは、断面視で前記第４リップの対角に位置しており、
    前記第２リップは、前記フランジの内周面に沿うように形状が規定されている請求項１または２に記載のモータ。     A flange bent outward in the radial direction of the motor is formed in the vicinity of the opening in the frame.
    The second lip is located diagonally to the fourth lip in a cross-sectional view.
    The motor according to claim 1 or 2, wherein the second lip has a shape defined so as to be along the inner peripheral surface of the flange.
  4. 前記段差の側面は前記フレームの内周面と径方向に対向しており、
    前記段差の底面は、前記エンドプレートの外面の径方向外縁まで延びかつ径方向外側に向かってフレームの底部側に向かうように傾斜している部分を有する請求項１から３のいずれか１項にモータ。     The side surface of the step faces the inner peripheral surface of the frame in the radial direction.
    According to any one of claims 1 to 3, the bottom surface of the step has a portion that extends to the radial outer edge of the outer surface of the end plate and is inclined toward the bottom side of the frame toward the radial outer side. motor.
  5. 前記段差の底面は、前記段差の側面から前記エンドプレートの外面の径方向外縁まで直線状に延びる傾斜面である請求項４に記載のモータ。 The motor according to claim 4, wherein the bottom surface of the step is an inclined surface that extends linearly from the side surface of the step to the radial outer edge of the outer surface of the end plate.
  6. 前記段差の底面は、径方向外側に位置する第１底面と、前記第１底面に連続して径方向内側に位置する第２底面とを含み、
    前記第１底面は、前記エンドプレートの外面の径方向外縁まで延びかつ径方向外側に向かってフレームの底部側に向かうように傾斜しており、
    前記第２底面は前記第１底面と軸方向に関して異なる方向に傾斜している請求項４に記載のモータ。     The bottom surface of the step includes a first bottom surface located on the outer side in the radial direction and a second bottom surface located on the inner side in the radial direction continuously with the first bottom surface.
    The first bottom surface extends to the radial outer edge of the outer surface of the end plate and is inclined outward in the radial direction toward the bottom side of the frame.
    The motor according to claim 4, wherein the second bottom surface is inclined in a direction different from that of the first bottom surface in the axial direction.
  7. 前記第２底面は前記段差の側面に直交している請求項６に記載のモータ。 The motor according to claim 6, wherein the second bottom surface is orthogonal to the side surface of the step.
  8. モータにおいて、
    前記第２底面は、前記第１底面と反対側に傾斜した傾斜面である請求項６に記載のモータ。     In the motor
    The motor according to claim 6, wherein the second bottom surface is an inclined surface inclined to the side opposite to the first bottom surface.
  9. 前記第１底面は、径方向外縁部から径方向内側部まで直線状に延びる傾斜面である請求項６から８のいずれか１項に記載のモータ。 The motor according to any one of claims 6 to 8, wherein the first bottom surface is an inclined surface that extends linearly from a radial outer edge portion to a radial inner portion.
  10. 前記第１底面の径方向外縁部は、径方向外側に向かってフレームの底部側に向かうように湾曲するフィレット形状である請求項６から８のいずれか１項に記載のモータ。 The motor according to any one of claims 6 to 8, wherein the radial outer edge portion of the first bottom surface has a fillet shape that curves toward the bottom side of the frame toward the outside in the radial direction.
  11. 前記エンドプレートの外面の径方向外縁部は、径方向外側に向かってフレームの底部側に向かうように湾曲するフィレット形状である請求項６から８のいずれか１項に記載のモータ。 The motor according to any one of claims 6 to 8, wherein the radial outer edge portion of the outer surface of the end plate has a fillet shape that is curved toward the bottom side of the frame toward the outer side in the radial direction.
  12. 前記第１底面は、径方向の幅が前記段差の底面の径方向の幅の半分以下である請求項６から１１のいずれか１項に記載のモータ。 The motor according to any one of claims 6 to 11, wherein the first bottom surface has a radial width of half or less the radial width of the bottom surface of the step.
  13. 請求項１から１２のいずれか１項に記載のモータと、
    前記モータに連結され、前記エンドプレートの外側に貫通孔から突出した前記回転軸に駆動連結されていて、前記モータの回転に応じて駆動される被駆動部を有する負荷と、を少なくとも備え、
    前記シールリングは、前記負荷の表面から前記フレームの底部側に押圧されることで、前記第１リップが前記段差の底面と前記フレームの内周面とで構成される第１コーナー部に、前記第２リップが前記負荷の表面と前記フレームの内周面とで構成される第２コーナー部に、前記第３リップが前記負荷の表面と前記段差の側面とで構成される第３コーナー部に、前記第４リップが前記段差の角部である第４コーナー部にそれぞれ当接している電気機器。     The motor according to any one of claims 1 to 12, and the motor.
    At least a load having a driven portion connected to the motor, driven to the rotating shaft protruding from the through hole to the outside of the end plate, and driven in response to the rotation of the motor, is provided.
    When the seal ring is pressed from the surface of the load toward the bottom of the frame, the first lip is placed on the first corner portion formed by the bottom surface of the step and the inner peripheral surface of the frame. The second lip is at the second corner formed by the surface of the load and the inner peripheral surface of the frame, and the third lip is at the third corner formed by the surface of the load and the side surface of the step. , An electric device in which the fourth lip is in contact with the fourth corner portion, which is the corner portion of the step.
PCT/JP2020/034410 2019-11-11 2020-09-11 Motor and electrical equipment including same WO2021095344A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59128963U (en) * 1983-02-18 1984-08-30 株式会社ナブコ Seal mechanism
JPH0586072U (en) * 1992-04-24 1993-11-19 三菱電線工業株式会社 Sliding packing
JP2002295683A (en) * 2001-03-28 2002-10-09 Nok Corp Seal for dovetail groove
JP2009287659A (en) * 2008-05-29 2009-12-10 Mitsubishi Cable Ind Ltd Sliding seal
JP2012132476A (en) * 2010-12-20 2012-07-12 Nanahoshi Kagaku Kenkyusho:Kk Packing and electric connector
WO2019159649A1 (en) * 2018-02-15 2019-08-22 パナソニックＩｐマネジメント株式会社 Motor and electric device with same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59128963U (en) * 1983-02-18 1984-08-30 株式会社ナブコ Seal mechanism
JPH0586072U (en) * 1992-04-24 1993-11-19 三菱電線工業株式会社 Sliding packing
JP2002295683A (en) * 2001-03-28 2002-10-09 Nok Corp Seal for dovetail groove
JP2009287659A (en) * 2008-05-29 2009-12-10 Mitsubishi Cable Ind Ltd Sliding seal
JP2012132476A (en) * 2010-12-20 2012-07-12 Nanahoshi Kagaku Kenkyusho:Kk Packing and electric connector
WO2019159649A1 (en) * 2018-02-15 2019-08-22 パナソニックＩｐマネジメント株式会社 Motor and electric device with same

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