JP2009296778A - Motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor wherein high hermeticity is easily ensured. <P>SOLUTION: The brushless motor 1 includes an end frame 41 so provided as to close the tip side of a housing case 2 and having a straight through-hole 44 open inside and outside the housing case 2 formed along the axial direction. It is further provided with: first and second rod-like terminals 61, 62 which are passed through the through-hole 44, with respective base end portions 61a, 62a placed inside the end frame 41 and respective tip portions 61b, 62b placed outside the end frame 41; and a guide pipe 75 and a holding portion 77 that are inserted between the first and second terminals 61, 62 inside the through-hole 44 in the axial direction to insulate them. It is further provided with an annular O-ring 78 that is abutted against the outer circumferential surfaces of the first and second terminals 61, 62 and the inner circumferential surface of the through-hole and seals them outside the through-hole 44 in the axial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor, and more particularly to a motor that is used in an air suspension device or the like and generates a high pressure inside the motor.

  2. Description of the Related Art Conventionally, there is a brushless motor including a stator having a teeth portion fixed inside a cylindrical housing case and wound with a driving coil, and a rotor disposed on the inner peripheral side of the stator. In such a brushless motor, a three-phase drive current is supplied to each drive coil via a lead wire connected to the drive coil. For example, in the motor described in Patent Document 1, the lead wire is drawn out through a grommet provided in the housing case, and the lead wire is protected by the grommet and water or the like enters the motor. It is prevented.

  By the way, in a motor used for an air suspension device or the like, for example, it is necessary to maintain a high pressure generated in the motor by the operation of the device, and thus high airtightness is required. However, since the motor of Patent Document 1 uses a flexible lead wire, there arises a problem that air leaks from the gap between the core wire of the lead wire and the covering member. Further, since the grommet is easily deformed by the pressure generated in the motor, air is liable to leak through the grommet, and it is difficult to ensure the airtightness of the motor. In particular, in the above-described conventional configuration, since the lead wire is inserted into the grommet while being bent at a right angle, the grommet may be deformed by being pressed by the lead wire, and air may leak.

Therefore, Patent Document 2 discloses a motor that secures airtightness without using lead wires and grommets by connecting rod-like terminals to a drive coil and molding and solidifying the terminals and stator with a molding material. Has been. Further, in this motor, the space between the flat surface portion of the housing case and the flange surface portion of the mold material and the sensor bracket is sealed with a seal member such as an O-ring, so Airtightness is secured.
JP 2005-184987 A JP-A-11-55923

  By the way, in the said patent document 2, the large diameter thread part by which the thread groove was threaded by the outer peripheral surface was formed in the intermediate part of the part embed | buried under the molding material of a terminal. And a terminal is embed | buried in a molding material in the state in which the sealing compound was apply | coated to the thread part, and the space | interval between a terminal and a molding material is sealed. For this reason, the conventional configuration has a problem that the shape of the terminal is complicated. Moreover, in order to ensure the airtightness between the terminal and the molding material, it is necessary to apply the sealing agent to the screw portion without any gap, and the work becomes complicated.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor that can easily ensure high airtightness.

  In order to achieve the above object, an invention according to claim 1 is a motor including a stator fixed inside a cylindrical housing case, and a rotor disposed on an inner peripheral side of the stator. An end frame that is provided so as to close one end side in the axial direction of the housing case and has a linear through hole penetrating along the axial direction; and the base end portion is inserted through the through hole. The rod-shaped connection terminal disposed on the inner side of the end frame and the tip portion disposed on the outer side of the end frame and the axially inner side of the through hole are inserted between the connection terminals, The invention includes an insulating member for insulating the connection terminal, and an annular seal member that is in contact with the outer peripheral surface of the connection terminal and the inner peripheral surface of the through hole on the outer side in the axial direction of the through hole. And

  According to the above configuration, the annular seal member contacts and seals the outer peripheral surface of the connection terminal and the inner peripheral surface of the through hole, thereby ensuring airtightness between the connection terminal, the end frame, and the insulating member. . Since the insulating member is disposed on the inner side in the axial direction and the sealing member is disposed on the outer side in the axial direction, it is possible to suppress the dynamic pressure from directly acting on the sealing member, and the sealing member is deformed to reduce its sealing performance. Can be prevented. For this reason, for example, a sealing member such as an O-ring can ensure airtightness between the connection terminal and the insulating member, and the terminal is embedded in the molding material by applying the sealing material to the screw portion as in the past. Compared to the case, the airtightness of the motor can be easily secured. In addition, since the insulating member is fitted into the through-hole extending linearly along the axial direction, when the insulating member is made of a material having a predetermined rigidity, the connection terminal is inclined or offset in the radial direction. It is possible to prevent only a part of the seal member from being pressed and reduce the sealing performance of the seal member.

  According to a second aspect of the present invention, in the motor according to the first aspect, the through hole has a small opening that opens to the outside of the end frame, a small opening that is continuous with the small opening, and inside the end frame. And a large opening having a larger opening than the small opening, and the axial end of the insulating member abuts on a step surface between the small opening and the large opening. To do.

  According to the above configuration, since the end portion of the insulating member abuts on the step surface between the small opening and the large opening, the insulating member is prevented from being excessively pressed in the axial direction by the insulating member. Deterioration of the member can be suppressed. In addition, since the direction of the dynamic pressure acting on the step surface can be changed, the dynamic pressure acting on the seal member can be reduced, and the seal member can be reliably prevented from being deformed to lower the sealing performance. it can. Furthermore, since the seal member is brought into contact with the inside of the small opening, for example, compared with the case where a groove for accommodating the seal member is formed on the inner peripheral surface of the through hole, it is possible to prevent the motor from being enlarged in the radial direction.

  According to a third aspect of the present invention, in the motor according to the first or second aspect, the sensor rotor is fixed to the rotation shaft of the rotor and rotates integrally with the rotation shaft, and the sensor rotor faces the sensor rotor in a radial direction. And a rotation detection sensor for detecting a rotation state of the rotor, wherein the end frame is formed with a plurality of the through holes, and the connection terminal is the base end The gist of the invention is that the portion includes a first terminal that is electrically connected to the driving coil of the stator and a second terminal that is electrically connected to the sensor coil of the sensor stator.

  According to the above configuration, the rotation state of the rotor can be detected by the rotation detection sensor including the sensor rotor and the sensor stator. In addition, since the first and second terminals are inserted through the through holes and sealed by the respective seal members, parts such as the seal members can be shared, and an increase in cost can be prevented.

  According to a fourth aspect of the present invention, in the motor according to any one of the first to third aspects, an insertion hole through which the tip end portion of the connection terminal is inserted is formed on the outer side in the axial direction of the end frame. A gist of the invention is that the sealing member is compressed in the axial direction by the insulating member and the end holder.

  According to the above configuration, since the seal member is compressed between the insulating member and the end holder, the seal member can be prevented from falling off, and the seal member can be prevented from moving in the axial direction, thereby suppressing a decrease in sealing performance. it can. In addition to the radially outer and inner sides of the insulating member, the sealing member seals three surfaces between the insulating member and the axial end surface, so that the airtightness of the motor can be ensured with higher accuracy. Furthermore, the amount of compression of the seal member can always be a constant amount, and stable sealing performance can be ensured.

  According to a fifth aspect of the present invention, in the motor according to any one of the first to fourth aspects, a bearing holder is provided in which a holding hole is provided in which a bearing for supporting the rotating shaft of the rotor is provided. The gist is that the through hole and the holding hole are arranged so as not to overlap in the axial direction.

  According to the above configuration, since the through hole and the holding hole are arranged so as not to overlap in the axial direction, when air flows from the other axial end side of the housing case, the bearing holder directly contacts the through hole. Air can be prevented from flowing, that is, direct dynamic pressure can be prevented from acting on the through hole. Thereby, it can suppress more reliably that air leaks from a motor.

The invention according to claim 6 is the motor according to any one of claims 1 to 5, wherein the seal member is an O-ring.
According to the above configuration, since the seal member is an O-ring, an increase in cost can be suppressed without using special parts as the seal member.

  A seventh aspect of the present invention is the motor according to any one of the first to sixth aspects, wherein the contact force on the outer diameter side of the seal member is larger than the contact force on the inner diameter side. It is a summary.

  According to the above configuration, since the contact force on the outer diameter side of the seal member is larger than the contact force on the inner diameter side, for example, between the large opening of the through hole and the insulation member, the insulation member and the connection terminal Even when a gap larger than the gap is formed and a larger dynamic pressure acts on the outer diameter side of the seal member than on the inner diameter side, airtightness on the outer diameter side of the seal member can be reliably ensured. Further, the contact force on the inner diameter side of the seal member is smaller than the contact force on the outer diameter side, but when air flows into the inner diameter side of the seal member, the direction of the flow is changed to reduce the dynamic pressure. At the same time, since sealing is performed on two surfaces having different sealing directions on the inner diameter side of the seal member and the axial insulating member side, airtightness on the inner diameter side of the seal member can be reliably ensured.

The gist of an eighth aspect of the present invention is that, in the motor according to any one of the first to seventh aspects, the insulating member and the seal member are integrally formed.
According to the above configuration, since the insulating member and the seal member are integrally formed, the number of parts can be reduced. Further, even when the seal member is small, the integrally formed component can be easily assembled to the connection terminal by being formed integrally with the insulating member.

A ninth aspect of the present invention is the motor according to any one of the first to seventh aspects, wherein the insulating member is integrally fixed to the connection terminal.
According to the above configuration, in the assembly process of the motor, it is not necessary to assemble the insulating member including its positioning, and the insulating member itself does not move in the axial direction, so that the axial movement of the insulating member to other parts is prevented. There is no need to configure a stopper. Thereby, drop-off of the seal member can be easily prevented.

A tenth aspect of the present invention is the motor according to the ninth aspect, wherein the insulating member includes a movement blocking portion that blocks movement in the axial direction between the connecting terminal and the motor.
According to the above configuration, since the movement preventing portion reliably prevents the insulating member itself from shifting in the axial direction, it is possible to more reliably prevent the seal member from falling off.

  ADVANTAGE OF THE INVENTION According to this invention, the motor which can ensure high airtightness with a simple structure can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
A brushless motor 1 shown in FIG. 1 is used for an air suspension device of a vehicle (not shown). The brushless motor 1 includes a cylindrical housing case 2 made of a metal material such as iron, a stator 3 fixed to the inner peripheral surface of the housing case 2, and a rotor 4 arranged inside the stator 3. And. A flange portion 2a extending radially outward is extended on the base end side (right side in FIG. 1) of the housing case 2, and the brushless motor 1 has an air suspension in which the flange portion 2a is screwed to the mounting member 5. It is fixed to the device.

  In the present embodiment, the stator 3 is fixed to the proximal end side on the inner peripheral surface of the housing case 2. The stator core 11 constituting the stator 3 includes a plurality of tooth portions 12 extending radially toward the center at predetermined angles, and ends of the teeth portions 12 on the outer peripheral side are connected by a connecting member so as to have a substantially annular shape. There is no. And each teeth part 12 is equipped with the insulator 13 which coat | covers the both end surfaces of the axial direction of each teeth part 12 and the both sides of a circumferential direction from both sides of an axial direction, and a winding concentrates on the insulator 13 Each of the driving coils 14 is wound by being wound a plurality of times.

  Further, a terminal holder 15 made of a synthetic resin material having insulating properties is disposed on the distal end side (left side in FIG. 1) of the housing case 2 in the stator 3. A plurality of engaging portions (not shown) extending toward the stator core 11 are formed at the peripheral edge of the terminal holder 15, and the terminal holder 15 is engaged by engaging the engaging portions with the insulator 13. It is fixed to the stator core 11 via an insulator 13. The terminal holder 15 is provided with a plurality of terminals 16 made of a conductive material, and connection portions 14 a drawn out from the respective driving coils 14 are connected to predetermined terminals 16.

  An annular bearing holder 21 is fixed to the distal end side of the inner peripheral surface of the housing case 2 with respect to the stator 3, and the bearing holder 21 has a holding hole 22 whose axis coincides with the axis of the housing case 2. Is formed. The bearing holder 21 is formed with an insertion hole 23 penetrating in the axial direction at a position corresponding to the terminal 16.

  The rotating shaft 31 constituting the rotor 4 is formed in a hollow shape, and is rotatably supported by bearings 32 and 33 provided on the mounting member 5 and the bearing holder 21 respectively. A magnet 34 magnetized with different polarities (N pole, S pole) for each predetermined angle is fixed to the outer peripheral surface of the rotating shaft 31. A piston rod (not shown) constituting the air suspension device is connected to the proximal end side of the rotating shaft 31.

  A substantially disc-shaped end frame 41 that closes the distal end portion of the housing case 2 is fixed to the distal end side of the housing case 2, and substantially opposite to the axial stator 3 in the end frame 41. A disc-shaped end holder 42 is fixed to the end frame 41 with screws 43. The end frame 41 is made of a metal material such as iron, and the end holder 42 is made of an insulating resin material. The end frame 41 is formed with a plurality of linear through holes 44 penetrating along the axial direction, and the end holder 42 has insertion holes 45 along the axial direction at positions corresponding to the through holes 44. Is formed. Each through hole 44 and each insertion hole 45 has a circular cross section. A housing portion 46 that is recessed in a substantially circular shape is formed at the center of the end frame 41, and the sensor stator 51 is housed in the housing portion 46. The sensor stator 51 constitutes a resolver 53 as a rotation detection sensor together with a sensor rotor 52 fixed to the tip of the rotating shaft 31.

  The sensor core 54 constituting the sensor stator 51 includes a plurality of teeth portions 55 extending radially inward, and ends of the teeth portions 55 on the outer peripheral side are connected by a connecting member to form a substantially annular shape. Yes. The sensor core 54 is formed by laminating a plurality of magnetic steel plates, and the tooth portions 55 of the sensor core 54 are formed at equal intervals in the circumferential direction. In each of the teeth portions 55, insulators 56 that cover both end surfaces in the axial direction and both side surfaces in the circumferential direction of the respective tooth portions 55 are mounted from both sides in the axial direction, and windings are concentrated on the insulators 56. The sensor coils 57 are wound by being wound a plurality of times. The sensor coil 57 has a one-phase excitation winding to which an excitation voltage is applied and a two-phase output that outputs a rotation detection signal having a different phase according to the rotation of the sensor rotor 52 based on the excitation of the excitation winding. The sensor core 54 is wound around a tooth portion 55 at a predetermined position. On the other hand, the sensor rotor 52 is formed in an annular shape by laminating a plurality of magnetic steel plates, and is fixed at a position facing the sensor stator 51 in the radial direction on the rotating shaft 31.

  The brushless motor 1 is inserted into the through hole 44 of the end frame 41 and the insertion hole 45 of the end holder 42, and is electrically connected to the plurality of first terminals 61 and the sensor coil 57 that are connected to the driving coil 14. A plurality of second terminals 62 are provided. Specifically, each of the first terminals 61 has a base end portion 61 a disposed on the axially inner side of the end frame 41 (on the axial stator 3 side in the end frame 41), and a distal end portion 61 b of the end frame 41. It is arranged on the outside in the axial direction (on the side opposite to the axial stator 3 in the end frame 41). And each base end part 61a is inserted in the insertion hole 23 of the bearing holder 21, and each is connected to the predetermined terminal 16, and each front-end | tip part 61b is each with the control apparatus 6 provided in the exterior of the brushless motor 1, respectively. It is connected. Each of the second terminals 62 has a base end portion 62 a disposed on the inner side in the axial direction of the end frame 41 and a distal end portion 62 b disposed on the outer side in the axial direction of the end frame 41. Each base end portion 62 a is connected to the connection portion 57 a of the sensor coil 57, and each distal end portion 62 b is connected to the control device 6. In the present embodiment, the first and second terminals 61 and 62 are formed in a cylindrical shape. Further, the first terminal 61 and the second terminal 62 constitute a connection terminal.

  In the brushless motor 1 configured as described above, when the rotor 4 is rotated by energizing a predetermined driving coil 14, the sensor rotor 52 rotates together with the rotating shaft 31. The resolver 53 outputs a rotation detection signal corresponding to the rotation state of the sensor rotor 52, that is, the rotation of the rotor 4 to the control device 6. The control device 6 controls the energization of each driving coil 14 based on the rotation detection signal input from the resolver 53 and controls the rotation of the brushless motor 1.

Next, the airtight holding structure of the brushless motor 1 will be described in detail.
As shown in FIG. 1 and FIG. 2, each through hole 44 formed in the end frame 41 is continuous with the small diameter portion 71 as a small opening portion opening outward in the axial direction, and inward in the axial direction. A large-diameter portion 72 that is open and has a larger diameter than the small-diameter portion 71. The small diameter portion 71 is larger than the outer diameter of the first and second terminals 61 and 62, and the insertion hole 45 is formed to have the same diameter as the outer diameter of the first and second terminals 61 and 62. Each through hole 44 is formed at the peripheral edge of the end frame 41, and is arranged so that each through hole 44 and the holding hole 22 do not overlap in the axial direction. Further, a stepped portion 73 having a smaller diameter than the axial end holder 42 side is formed on the outer periphery of the end frame 41 on the axial stator 3 side, and a seal member 74 made of an O-ring or the like is formed on the stepped portion 73. It is arranged.

  Inside the through hole 44 through which the first terminal 61 is inserted, a guide pipe 75 as an insulating member made of an insulating resin material is inserted between the first terminal 61 and the through hole 44. In addition, the first terminal 61 is insulated by the guide pipe 75. The guide pipe 75 is formed in a cylindrical shape and is configured such that both end portions in the axial direction abut on the step surface 76 between the small diameter portion 71 and the large diameter portion 72 or the terminal 16, respectively. Its axial movement is restricted. In addition, a holding portion 77 as an insulating member integrally formed by extending radially outward from the insulator 56 is formed on the inner side in the axial direction of the through hole 44 through which the second terminal 62 is inserted. The second terminal 62 is insulated by the holding portion 77. The holding portion 77 is formed in a cylindrical shape, and holds the second terminal 62 so that the proximal end portion 62a of the second terminal 62 is exposed and faces the sensor coil 57 in the radial direction. The holding portion 77 is integrally formed with the insulator 56, so that its axial movement is restricted. The resin material constituting the guide pipe 75 and the holding portion 77 has a predetermined rigidity (for example, a rigidity higher than that of a sealing member such as an O-ring and a rigidity that does not deform due to a dynamic pressure generated by the operation of the air suspension device). Have.

  Since the end frame 41 is assembled to the housing case 2 with the guide pipe 75 fitted on the first terminal 61, a slight gap is provided between the large diameter portion 72 and the guide pipe 75 from the viewpoint of assembly. There is a gap (see FIG. 2). In FIG. 2, the gap between the guide pipe 75 and the large diameter portion 72 is exaggerated for convenience of explanation. Similarly, there is a slight gap between the large diameter portion 72 and the holding portion 77.

  As shown in FIG. 2, an annular O-ring 78 extending over the entire circumference of the first terminal 61 is provided at a position corresponding to the small diameter portion 71 of the first terminal 61. An O-ring 78 as a seal member is in contact with the outer peripheral surface of the first terminal 61 and the inner peripheral surface of the small diameter portion 71 and is disposed between the end holder 42 and the guide pipe 75. In the present embodiment, the end holder 42 is fixed to the end frame 41 in a state where the O ring 78 is pressed toward the axial stator 3, and the O ring 78 is compressed by the guide pipe 75 and the end holder 42. ing. Specifically, the O-ring 78 is always compressed by a certain amount so that its axial length is the same as the axial length of the small diameter portion 71. The O-ring 78 is formed so that the contact force on the outer diameter side is larger than the contact force on the inner diameter side. Specifically, the O-ring 78 is formed so that the curvature on the outer diameter side is smaller than the curvature on the inner diameter side, so that the contact force on the outer diameter side is larger than the contact force on the inner diameter side. An O-ring 78 is similarly provided at a position corresponding to the small diameter portion 71 of the second terminal 62. Needless to say, the first and second terminals 61 and 62 and the end frame 41 are insulated from each other by an O-ring 78.

  In the brushless motor 1 configured as described above, the O-ring 78 ensures airtightness between the first and second terminals 61 and 62 and the end frame 41 and the guide pipe 75 or the holding portion 77. Further, the seal member 74 ensures airtightness between the housing case 2 and the end frame 41. As a result, the high pressure generated in the motor by the operation of the air suspension device is maintained.

Next, a method for manufacturing the brushless motor 1 will be described focusing on the assembly of the first and second terminals 61 and 62.
First, the end holder 42 is assembled to the end frame 41. Next, the O-ring 78 is attached to the second terminal 62 that is integrally molded with the holding portion 77. Next, the sensor stator 51 is fixed to the end frame 41 so that the second terminal 62 is inserted through the through hole 44. Then, the seal member 74 is attached to the stepped portion 73 of the end frame 41.

  Subsequently, the guide pipe 75 and the O-ring 78 are attached to the first terminal 61 joined to the terminal 16 of the stator 3. The stator 3 and the bearing holder 21 are fixed to the housing case 2 in advance. Then, the end frame 41 assembled with the sensor stator 51 is assembled to the housing case 2 so that the guide pipe 75 and the holding unit 77 are inserted into the large diameter portion 72 of the end frame 41. Thereafter, the brushless motor 1 is manufactured by assembling the rotor 4.

As described above, according to the present embodiment, the following operations and effects are achieved.
(1) The brushless motor 1 includes an end frame 41 that is provided so as to close the front end side of the housing case 2 and that is open to the inside and outside of the housing case 2 and is formed with a linear through hole 44 along the axial direction. It was. Also, the first and second cylindrical shapes are inserted through the through-hole 44 and the base end portions 61 a and 62 a are disposed inside the end frame 41 and the distal end portions 61 b and 62 b are disposed outside the end frame 41. A guide pipe 75 and a holding portion 77 are provided which are fitted between the two terminals 61 and 62 and between the first and second terminals 61 and 62 on the inner side in the axial direction of the through-hole 44 and to insulate them. An annular O-ring 78 is provided on the outer side in the axial direction of the through hole 44 to seal against the outer peripheral surface of the first and second terminals 61 and 62 and the inner peripheral surface of the through hole. Therefore, the O-ring 78 is in contact with the outer peripheral surfaces of the first and second terminals 61 and 62 and the inner peripheral surface of the through hole 44, so that the first and second terminals 61 and 62, the end frame 41, and the guide pipe 75 or the airtightness between the holding portion 77 is ensured. Since the guide pipe 75 and the holding portion 77 are arranged on the inner side in the axial direction and the O-ring 78 is arranged on the outer side in the axial direction, it is possible to prevent the dynamic pressure from directly acting on the O-ring 78, and the airtightness of the motor It is possible to prevent the O-ring 78 from being deformed and the sealing performance from being lowered. Therefore, the O-ring 78 can ensure airtightness between the first and second terminals 61 and 62 and the guide pipe 75 or the holding portion 77, and a sealing material is applied to the screw portion as in the conventional case. Thus, the airtightness of the brushless motor 1 can be easily ensured as compared with the case where the brushless motor 1 is embedded. Further, since the guide pipe 75 and the holding portion 77 made of a resin material having a predetermined rigidity are fitted into the through hole 44 extending linearly along the axial direction, the first and second terminals 61 and 62 are inclined, or It is possible to prevent the O-ring 78 from being deteriorated in sealing performance by offsetting in the radial direction and pressing only a part of the O-ring 78.

  (2) The through-hole 44 is continuous with the small-diameter portion 71 that opens outward in the axial direction of the end frame 41 and the small-diameter portion 71, and opens in the axial direction of the end frame 41 and has a larger diameter than the small-diameter portion 71. A large-diameter portion 72. The axial ends of the guide pipe 75 and the holding portion 77 are in contact with the step surface 76. Therefore, the O-ring 78 is prevented from being excessively pressed in the axial direction by the guide pipe 75 or the holding portion 77, and deterioration of the O-ring 78 can be suppressed. Moreover, since the direction of the dynamic pressure acting on the stepped surface 76 can be changed, the dynamic pressure acting on the O-ring 78 can be reduced, and the O-ring 78 is deformed to reduce the sealing performance. Can be prevented. Further, since the O-ring 78 is brought into contact with the inside of the small-diameter portion 71, for example, compared with the case where a groove for accommodating the O-ring is formed on the inner peripheral surface of the through hole 44, the brushless motor 1 is prevented from being enlarged in the radial direction. it can.

  (3) The rotor includes a sensor rotor 52 that is fixed to the rotating shaft 31 of the rotor 4 and rotates integrally with the rotating shaft 31, and an annular sensor stator 51 that is disposed so as to face the sensor rotor 52 in the radial direction. 4 is provided with a resolver 53 for detecting the rotational state of 4. A plurality of through holes 44 are formed in the end frame 41, and a first terminal 61 whose base end portion 61 a is electrically connected to the driving coil 14 and a second terminal whose base end portion 62 a is electrically connected to the sensor coil 57. The connection terminal is configured by 62. Therefore, the resolver 53 can detect the rotational state of the rotor 4. Further, since the first and second terminals 61 and 62 are inserted into the through holes 44 and sealed by the respective O-rings 78, a common O-ring 78 can be used, and an increase in cost can be prevented.

  (4) On the opposite side of the axial stator 3 in the end frame 41, an end holder 42 having insertion holes 45 through which the respective tip portions 61b, 61b of the first and second terminals 61, 62 are respectively inserted is provided. . Each O-ring 78 was compressed in the axial direction by the guide pipe 75 or the holding portion 77 and the end holder 42. For this reason, it is possible to prevent the O-ring 78 from falling off the brushless motor 1, and to prevent the O-ring 78 from moving in the axial direction, thereby suppressing a decrease in sealing performance. Further, since the O-ring 78 seals the guide pipe 75 or the axial end face of the holding portion 77 in addition to the outer diameter side and the inner diameter side, the airtightness of the brushless motor 1 can be secured with higher accuracy. . Furthermore, the compression amount of the O-ring 78 can always be a constant amount, and stable sealing performance can be ensured.

  (5) The bearing holder 21 in which the holding hole 22 provided with the bearing 33 is formed is provided, and the through hole 44 and the holding hole 22 are arranged so as not to overlap in the axial direction. Therefore, when air flows from the base end side of the housing case 2 by the operation of the air suspension device, it is possible to prevent air from flowing directly into the through hole 44 by the bearing holder 21, that is, direct dynamic pressure acts on the through hole 44. Can be prevented. Thereby, it can suppress more reliably that air leaks from the brushless motor 1.

(6) Since the O-ring 78 is used as the seal member, an increase in cost can be suppressed without using a special part as the seal member.
(7) From the viewpoint of assembling properties, there are gaps between the guide pipe 75 and the large diameter portion 72 and between the holding portion 77 and the large diameter portion 72. A larger dynamic pressure acts on the outer diameter side of the ring 78 than on the inner diameter side. In this respect, according to the present embodiment, the O-ring 78 is configured such that the abutting force on the outer diameter side is larger than the abutting force on the inner diameter side, so that a large dynamic pressure is applied to the outer diameter side of the O-ring 78. The airtightness is surely ensured. The contact force on the inner diameter side of the O-ring 78 is smaller than the contact force on the outer diameter side, but the dynamic pressure is reduced by changing the air flow between the large diameter portion 72 and the small diameter portion 71. At the same time, since sealing is performed on two surfaces with different sealing directions, airtightness on the inner diameter side of the O-ring 78 can be reliably ensured.

  (8) Since the end frame 41 is made of a metal material such as iron, even if a high pressure is generated inside the motor, the end frame 41 is not deformed, and a decrease in the sealing performance of the O-ring 78 can be prevented.

In addition, you may implement this embodiment in the following aspects.
In the above embodiment, the first terminal 61 is provided with the guide pipe 75 and the O-ring 78 that are made of different members. However, the present invention is not limited to this, and the airtight holding member in which the guide pipe 75 and the O-ring 78 are integrated. May be provided in the first terminal 61. For example, as shown in FIG. 3, the airtight holding member 81 is made of an insulating material such as rubber, and includes a substantially cylindrical insulating portion 82 and an annular seal portion 83 continuous with the insulating portion 82. The Further, an engagement groove 84 is formed on the inner peripheral surface of the insulating portion 82 along the circumferential direction. And the flange part 86 extended on the outer peripheral surface of the rotating shaft 85 to the radial direction outer side engages with the engaging groove 84, and the axial movement of the airtight holding member 81 is controlled. Thereby, the movement of the seal portion 83 in the axial direction is restricted, and the deterioration of the seal performance can be prevented. By comprising in this way, since an insulating member and a sealing member are integrally formed, a number of parts can be reduced. Even when the seal portion 83 is small, the hermetic holding member 81 can be easily assembled to the first terminal 61 by being formed integrally with the insulating portion 82.

  Further, a flange portion extending radially outward is formed on the outer peripheral surface of the insulating portion 82, and the flange portion abuts against a recess formed in a peripheral member thereof (for example, the bearing holder 21 or the end frame 41). The movement of the airtight holding member 81 in the axial direction may be restricted. The second terminal 62 may be provided with the above-described airtight holding member 81 instead of the holding portion 77 and the O-ring 78.

  In the above embodiment, the first terminal 61 is separated from the guide pipe 75 as an insulating member, and these are configured to be relatively movable in the axial direction. However, as shown in FIG. 4, the first terminal 61 is insert-molded. Alternatively, the two may be integrally fixed by press-fitting into the guide pipe 75. Thereby, in the assembly process of the brushless motor 1, it is not necessary to assemble the guide pipe 75 including its positioning, and the guide pipe 75 itself does not move in the axial direction. There is no need to configure a stopper to prevent the above. Thereby, dropping of the O-ring 78 can be easily prevented. Similarly, the second terminal 62 and the holding portion 77 may be integrally fixed.

  Also, as shown in FIG. 4, the first terminal 61 is formed with a recess 61c that is partly pressed from the radial direction and recessed inward in the radial direction. The guide pipe 75 is formed with a movement preventing portion 75a that engages with the recess 61c. For this reason, since the movement prevention part 75a prevents the guide pipe 75 itself from moving in the axial direction, it is possible to prevent the O-ring 78 from falling off more reliably. Note that a flange portion protruding outward in the radial direction may be formed on the first terminal 61, and insert molding may be performed so that this flange portion is included. Further, a concave portion or a flange portion may be formed on the second terminal 62, and a movement preventing portion corresponding to this may be formed on the holding portion 77.

  In the above embodiment, the through hole 44 has the small diameter portion 71 that opens to the outside in the axial direction of the end frame 41 and the large diameter portion 72 that opens to the inside in the axial direction of the end frame 41, but is not limited thereto. For example, the through hole may have a large diameter portion on the outer side in the axial direction of the end frame 41 that is larger in diameter than the inner side in the axial direction. Moreover, you may form a through-hole with the same diameter along an axial direction.

  -In above-mentioned embodiment, although the guide pipe 75 and the insulator 13 were formed separately, it is not restricted to this, You may form the guide pipe 75 and the insulator 13 integrally. Moreover, in the said embodiment, although the holding | maintenance part 77 and the insulator 56 were formed integrally, it is not restricted to this, You may form the holding | maintenance part 77 and the insulator 56 separately.

  In the above embodiment, the first and second terminals 61 and 62 are formed in a cylindrical shape. However, the present invention is not limited to this, and other shapes such as an elliptical column or a polygonal column with corners (corner) processed into an R surface are used. May be. In addition, it is preferable that the through hole and the seal member have shapes corresponding to these cross-sectional shapes.

  In the above embodiment, the O-ring 78 is compressed between the end frame 41 and the end holder 42, but not limited to this, the O-ring 78 is not compressed in the axial direction, and the end frame 41 and the end holder 42 are not compressed. It may be arranged between them.

  In the above embodiment, the end holder 42 is provided on the side of the end frame 41 opposite to the axial stator 3. However, the present invention is not limited thereto, and the end holder 42 is not provided, and the small diameter portion 71 in the through hole 44 is fixed in the axial direction. On the side opposite to the child 3, a fixing portion having a hole larger than the outer diameter of the first and second terminals 61 and 62 and smaller than the outer diameter of the O-ring 78 is formed in the end frame 41 to prevent the O-ring 78 from falling off. You may make it do.

In the above embodiment, the through hole 44 and the holding hole 22 are not overlapped in the axial direction. However, the present invention is not limited to this, and the through hole 44 and the holding hole 22 may be overlapped in the axial direction.
In the above embodiment, the O-ring 78 is formed so that the outer diameter side curvature is smaller than the inner diameter side curvature so that the outer diameter side contact force is greater than the inner diameter side contact force. However, the present invention is not limited to this. For example, a general O-ring 78 having the same curvature as the inner and outer diameters is used, and the difference between the outer diameter of the first terminal 61 and the inner diameter of the O-ring 78 before installation is larger than that before installation. By making the difference between the outer diameter of the O-ring 78 and the inner diameter of the small-diameter portion 71 larger, the outer diameter side compression amount is larger than the inner diameter side compression amount. The contact force may be greater than the contact force on the inner diameter side.

  In the above embodiment, the O-ring is used as the seal member. However, the present invention is not limited to this, and the first and second terminals 61 and 62 and the small-diameter portion are extended over the entire circumference of the first and second terminals 61 and 62. Other sealing members such as gaskets may be used as long as the space between them can be sealed.

  In the above embodiment, the resolver 53 including the sensor rotor 52 and the sensor stator 51 is used. However, the invention is not limited to this. For example, the rotor 4 is provided with a sensor magnet, and the rotor 4 is rotated by a magnetic sensor such as a Hall IC. The state may be detected.

  In the above embodiment, the present invention is applied to the brushless motor 1 used in the air suspension device. However, the present invention is not limited to this, and the present invention may be applied to other devices that require high airtightness.

Sectional drawing of a brushless motor. The partial cross section figure which shows the airtight holding structure of the 1st terminal. Sectional drawing of the airtight holding member in another example. (A) Sectional drawing of the 1st terminal and guide pipe in another example, (b) AA sectional view taken on the line in (a).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 2 ... Housing case, 3 ... Stator, 4 ... Rotor, 14 ... Coil for drive, 21 ... Bearing holder, 22 ... Holding hole, 31, 85 ... Rotating shaft, 33 ... Bearing, 41 ... End Frame, 42 ... End holder, 44 ... Through hole, 45 ... Insertion hole, 51 ... Sensor stator, 52 ... Sensor rotor, 57 ... Coil for sensor, 61 ... First terminal, 61a, 62a ... Base end, 61b, 62b ... distal end portion, 62 ... second terminal, 71 ... small diameter portion, 72 ... large diameter portion, 75 ... guide pipe, 75a ... movement preventing portion, 76 ... stepped surface, 77 ... holding portion, 78 ... O-ring, 81 ... airtight Holding member, 82 ... insulating part, 83 ... seal part.

Claims (10)

A motor comprising a stator fixed inside a cylindrical housing case, and a rotor arranged on the inner peripheral side of the stator,
An end frame which is provided so as to close one end side of the housing case in the axial direction, and has a linear through hole penetrating along the axial direction;
A rod-shaped connection terminal that is inserted through the through-hole and has a proximal end portion disposed inside the end frame and a distal end portion disposed outside the end frame;
An insulating member that is inserted between the connection terminals on the inner side in the axial direction of the through hole, and that insulates the connection terminals;
A motor comprising: an annular seal member that contacts and seals the outer peripheral surface of the connection terminal and the inner peripheral surface of the through hole on the outer side in the axial direction of the through hole. The through hole has a small opening that opens to the outside of the end frame, and a large opening that is continuous with the small opening and opens to the inside of the end frame and is larger than the small opening. ,
The motor according to claim 1, wherein an axial end portion of the insulating member abuts on a step surface between the small opening and the large opening. A sensor rotor that is fixed to a rotation shaft of the rotor and rotates integrally with the rotation shaft, and an annular sensor stator that is disposed so as to face the sensor rotor in a radial direction, and detects a rotation state of the rotor. A rotation detection sensor for
A plurality of the through holes are formed in the end frame,
The connection terminal includes a first terminal whose base end portion is connected to the driving coil of the stator and a second terminal whose base end portion is connected to the sensor coil of the sensor stator. The motor according to claim 1 or 2, characterized in that An end holder having an insertion hole through which the tip end of the connection terminal is inserted on the outer side in the axial direction of the end frame;
The motor according to claim 1, wherein the seal member is compressed in the axial direction by the insulating member and the end holder. A bearing holder having a holding hole in which a bearing for supporting the rotating shaft of the rotor is provided;
The motor according to any one of claims 1 to 4, wherein the through hole and the holding hole are arranged so as not to overlap in the axial direction.   The motor according to any one of claims 1 to 5, wherein the seal member is an O-ring.   The motor according to any one of claims 1 to 6, wherein a contact force on the outer diameter side of the seal member is configured to be larger than a contact force on the inner diameter side.   The motor according to claim 1, wherein the insulating member and the seal member are integrally formed.   The motor according to any one of claims 1 to 8, wherein the insulating member is integrally fixed to the connection terminal.   The motor according to claim 9, wherein the insulating member includes a movement blocking unit that blocks movement in an axial direction between the insulating member and the connection terminal.

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