JP2011094553A - Electric pump - Google Patents

Abstract

An electric pump capable of preventing shaft misalignment is provided.
A motor component includes a pump component that constitutes a trochoid pump, a motor component that drives the pump component, and a motor drive controller that controls the motor component. Are arranged in the extending direction of the rotating shaft 34, and the rotating shaft 34 extending from the motor component 32 is connected to the pump rotor inner 103 of the pump component 31. The pump component 31 and the motor component 32 are fitted inside the cylindrical case 41, and the outer peripheral surface of the pump component 31 and the outer peripheral surface of the motor component 32 are in contact with the inner surface 42 of the case 41. The pump component 31 and the motor component 32 are positioned.
[Selection] Figure 4

Description

  The present invention relates to an electric pump that delivers oil, for example.

  Automobile idle stop is effective for energy saving and CO2 reduction, and is indispensable for maintaining and improving the global environment.

  In a vehicle employing such an idle stop system, the hydraulic pressure is reduced when the engine is stopped. For this reason, in an AT or CVT-equipped vehicle that requires hydraulic pressure for operation, the startability and drivability of the vehicle may be reduced.

  For this reason, in order to prevent these problems, the AT and CVT systems are provided with an electric pump for controlling the hydraulic pressure so that the hydraulic pressure for control can be maintained at a predetermined pressure.

  Such an electric pump is attached to the casing surface of AT or CVT, and is connected to a hydraulic path formed in the casing so as to pressurize oil.

  Specifically, the electric pump includes a pump that pressurizes oil sucked from the suction port and discharges the oil from the discharge port, a motor for rotationally driving the pump, and a control unit for controlling the motor; A trochoid pump is used as the pump.

  The electric pump connects a rotating shaft extending from the motor to an inner rotor of the trochoid pump to couple the motor and the trochoid pump, and connects the intake port and the discharge port of the trochoid pump to the casing. Connect to the hydraulic path that opens to the surface. In this state, the flange portion at the tip of the trochoid pump is fixed to the casing with a bolt, and the electric pump is attached to the casing of the AT or CVT.

  However, in such a conventional electric pump, shaft misalignment may occur when the rotating shaft from the motor is connected to the inner rotor of the trochoid pump, and it has been difficult to align the shaft.

  The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an electric pump capable of preventing shaft misalignment.

  In order to solve the above-mentioned problem, in the electric pump according to claim 1 of the present invention, a pump component constituting the pump, a motor component driving the pump component, and controlling the motor component And an electric pump in which the rotation shaft extending from the motor component is connected to a pump rotor of the pump component. The pump component and the motor component are fitted in a cylindrical case, and the outer peripheral surface of the pump component and the outer peripheral surface of the motor component are in contact with the inner surface of the case. Then, the pump component and the motor component were positioned.

  That is, the pump component that constitutes the pump and the motor component that drives the pump component are arranged in the extending direction of the rotating shaft of the motor component, and extend from the motor component. A rotating shaft is connected to the pump rotor of the pump component.

  The pump component and the motor component are fitted in a cylindrical case, and the outer peripheral surface of the pump component and the outer peripheral surface of the motor component are in contact with the inner surface of the case. It is positioned in the state.

  Therefore, in the state where the pump component and the motor component are fitted in the case, the central axis of the pump component is positioned with reference to the inner surface of the case where the outer peripheral surface is in contact. The motor component is also positioned at its central axis with reference to the inner surface of the case whose outer peripheral surface is in contact.

  In the electric pump according to claim 2, a flange portion fixed to the outer surface of the casing of the automatic transmission is provided on the rear end side of the case, and a front end side of the flange portion is provided in an attachment hole provided in the casing. The flange portion is configured to be fixable to the outer surface in the inserted state, and the pump component portion and the motor component portion are disposed on the distal end side of the case with respect to the flange portion, and the mounting hole of the attachment hole in the attached state. The distal end side of the pump constituent part was constituted by a pump base provided with a suction port and a discharge port connected to a hydraulic path provided on the back surface.

  That is, when the electric pump is attached to the automatic transmission, the front end side of the case where the pump component and the motor component are disposed is inserted into an attachment hole provided in the casing of the automatic transmission. A suction port and a discharge port of the pump base constituting the front end side of the pump component are connected to a hydraulic path provided in the back surface of the mounting hole, and a flange portion provided on the rear end side of the case Fix to the outer surface of the casing.

  Then, the electric pump is attached to the automatic transmission in a state where the front end side of the case where the pump component and the motor component are disposed is disposed in the casing of the automatic transmission.

  Furthermore, in the electric pump according to claim 3, a first claw portion and a second claw portion that extend toward the center of the case are provided at a tip of the case, and the first claw portion and the second claw portion are provided. A first concave portion and a second concave portion that engage with the pump base are formed on the end surface of the pump base to constitute a detent, while one end portion is inserted into the pump base and disposed opposite the pump base. The pump housing was press-fitted and fixed to the case in a state where the pump housing was positioned with respect to the pump base by a pin inserted into the pump housing at the other end.

  That is, when the electric pump is assembled, the pump component is fitted into the case. At this time, the front end of the case is provided with a first claw portion and a second claw portion extending toward the center of the case, and the end surface of the pump base constituting the pump component is A first concave portion and a second concave portion that engage with the first claw portion and the second claw portion are formed, and a detent is configured.

  For this reason, the said pump base which comprises the said pump structure part prevents the careless rotation with respect to the said case.

  At this time, one end and the other end of the pin are inserted into the pump base and the pump housing facing the pump base, and the pump housing is inadvertent in the rotational direction with respect to the pump base. Misalignment is prevented.

  For this reason, displacement of the pump base and the pump housing in the rotational direction with respect to the case is reliably prevented.

  The rotation-prevented pump housing is fixed by being press-fitted into the case. Accordingly, the pump base and the pump housing are prevented from moving in the removal direction, and the anti-rotation effect by the both claw portions and the concave portion and the anti-rotation effect of the pump base and the pump housing by the pin are maintained. Is done.

  In addition, in the electric pump according to claim 4, one end portion of the rotating shaft protrudes through the motor rotor of the motor constituent portion and is rotatably supported via a base end side bearing. The other end of the pump protrudes through the pump rotor of the pump component and is supported by the pump base via a tip side bearing.

  That is, the rotating shaft passes through the motor rotor of the motor component and the pump rotor of the pump component, and one end projecting through the motor rotor is supported via a proximal bearing. The other end of the rotating shaft protruding through the pump rotor is supported by the pump base via a tip side bearing.

  Thus, since the both ends of the rotating shaft are supported via bearings, the support rigidity is increased and the prevention of shaft misalignment is enhanced as compared with the case where the midway portion is supported.

  Further, in the electric pump according to claim 5, one end portion of the rotating shaft protrudes through the motor rotor of the motor constituent portion and is rotatably supported through a base end side bearing, while the other end of the rotating shaft is supported. The pump rotor to which the part was connected was rotatably supported by the pump housing via a tip side bearing.

  That is, one end portion of the rotating shaft passes through the motor rotor of the motor constituting portion, and the protruding portion is rotatably supported via the base end side bearing. On the other hand, the other end portion of the rotating shaft is connected to the pump rotor, and the pump rotor is rotatably supported by the pump housing via a tip side bearing.

  Thereby, the pump rotor that rotates is directly supported by the tip bearing.

  Further, in the electric pump according to claim 6, the motor drive control unit is connected to a base end portion of the motor component, and is provided with a bus bar for relaying energization to the motor winding and a connector unit for connecting an external device. A resin insulator, a control board that is supported by the insulator and controls an output signal to the bus bar based on a signal from the connector portion, and performs motor drive control, and the case so as to cover the control board And a controller cover provided with cooling fins for releasing the heat generated inside to the outside, and an engagement recess is provided at the base end of the connector portion of the insulator. An engaging convex portion that engages with the mating concave portion is provided on the controller cover to form a meshing structure, and a sealant is applied to a joint portion between the engaging concave portion and the engaging convex portion to apply the engaging convex Part It was engaged with the engaging recess.

  That is, the motor drive controller adjacent to the motor component in a state arranged in the extending direction of the rotating shaft of the motor component includes an insulator connected to a base end of the motor component. The insulator is provided with a bus bar that relays energization to the motor windings, and is easily electrically connected to the motor.

  The insulator is provided with a connector portion for connecting an external device, and the control board supported by the insulator is protected by being covered with a controller cover attached to the case.

  The controller cover is provided with cooling fins, so that a cooling effect of releasing heat generated inside to the outside can be obtained.

  On the other hand, an engagement recess is provided at the base end of the connector portion of the insulator, and when the controller cover is attached, the engagement protrusion provided on the controller cover is connected to the engagement cover. By engaging and engaging the mating recess, inadvertent detachment is prevented.

  And, at the time of assembly, a sealing agent is applied to the joint portion between the engagement concave portion and the engagement convex portion so that the convex portion and the concave portion are engaged with each other. Is secured.

  As described above, in the electric pump according to the first aspect of the present invention, in the state where the pump component and the motor component are fitted in the case, the pump is based on the inner surface of the case where the outer peripheral surface is in contact. The center position of the component and the motor component can be determined.

  This facilitates centering of the rotating shaft extending from the motor component, and can reliably prevent shaft misalignment in the pump component and the motor component.

  Therefore, as compared with the conventional case in which the rotating shaft extending from the motor component has to be assembled in accordance with the pump rotor of the pump component, the assembling work is facilitated and the assembling accuracy is improved. be able to.

  And since the axial shift in the said pump structure part and the said motor structure part can be prevented, rotation loss can also be prevented and rotation efficiency can also be improved.

  Further, in the electric pump according to claim 2, a portion of the case where the pump component and the motor component are disposed is inserted into a mounting hole provided in a casing of the automatic transmission, and the pump The suction port and the discharge port of the pump base constituting the front end side of the component part are connected to a hydraulic path provided on the back surface of the mounting hole, and a flange part provided on the rear end side of the case is connected to the casing. The electric pump can be assembled to the automatic transmission by being fixed to the outer surface.

  At this time, the electric pump is attached to the automatic transmission in a state where the front end side of the case where the pump component and the motor component are disposed is disposed in the casing of the automatic transmission.

  For this reason, at the time of attachment, the amount of protrusion from the casing outer surface can be suppressed as compared with the conventional case where the electric pump protrudes from the casing over the entire length. Thereby, even in an environment where the installation space is limited, installation is possible while preventing interference with others.

  Furthermore, in the electric pump according to claim 3, when the pump constituent part is fitted in the case, the first claw part and the second claw part provided at the tip of the case constitute the pump constituent part. By engaging the first recess and the second recess of the pump base, it is possible to prevent the pump base from being inadvertently rotated with respect to the case.

  At this time, one end portion and the other end portion of the pin are inserted into the pump base and the pump housing facing the pump base to prevent inadvertent rotation of the pump housing with respect to the pump base. Can do.

  Accordingly, it is possible to reliably prevent displacement of the pump base and the pump housing with respect to the case in the rotational direction.

  The rotation-prevented pump housing is press-fitted into the case and fixed. As a result, the pump base and the pump housing can be prevented from moving in the removal direction, the anti-rotation effect by the both claw portions and the recess, and the anti-rotation of the pump base and the pump housing by the pin The effect can be maintained.

  Thus, the pump component including the pump base and the pump housing can be easily formed in the case.

  For this reason, the assemblability is improved as compared with the case where the case, the pump base, and the pump housing must be assembled while being aligned. Moreover, since each part can be individually formed, the processability of each part can be improved, and the cost can be reduced.

  In addition, in the electric pump according to claim 4, the rotating shaft passes through the motor rotor of the motor component and the pump rotor of the pump component, and one end protruding through the motor rotor Is supported through a proximal end bearing, and the other end of the rotating shaft protruding through the pump rotor is supported by the pump base through a distal end bearing.

  Thereby, since the both ends of the said rotating shaft are supported rotatably, compared with the case where a midway part is supported, while being able to raise a support force, further raising a shaft shift prevention effect. Can do.

  In the electric pump according to claim 5, one end portion of the rotating shaft passes through the motor rotor of the motor constituting portion, and a protruding portion thereof is rotatably supported through a base end side bearing. On the other hand, the other end portion of the rotating shaft is connected to the pump rotor, and the pump rotor is rotatably supported by the pump housing via a tip side bearing.

  As a result, the pump rotor that rotates can be supported directly by the tip bearing while the other end of the rotating shaft can be supported via the pump rotor.

  Furthermore, in the electric pump according to claim 6, the motor drive controller adjacent to the motor component in a state arranged in the extending direction of the rotating shaft of the motor component is a base end portion of the motor component. The insulator is connected to the bus bar, and the insulator is provided with a bus bar that relays energization to the motor windings. For this reason, by using the bus bar, it is possible to easily and efficiently make an electrical connection with the motor without drawing a harness or the like.

  Further, the insulator is provided with a connector portion for connecting an external device, and the control board supported by the insulator can be protected in a state of being covered with a controller cover attached to the case.

  At this time, the controller cover is provided with cooling fins, and heat generated inside can be released to the outside through the cooling fins. Thereby, a cooling effect can be improved and the malfunction resulting from heat can be prevented beforehand.

  On the other hand, an engagement recess is provided at the base end portion of the connector portion of the insulator, and when the controller cover is attached, the engagement protrusion provided on the controller cover is used as the engagement recess. By engaging and meshing, inadvertent detachment can be prevented.

  And at the time of an assembly | attachment, while the said convex part and the said recessed part mesh | engage in the state which apply | coated the sealing agent to the junction part of the said engaging recessed part and the said engaging convex part, the said engaging part can be sealed. The effect of reinforcing the base end of the connector part can also be obtained.

  And, since the insulator provided with the bus bar for supporting the control board and relaying the energization to the motor winding is provided with a connector part for connecting to an external device, the external device connects the control board via the control board. Electrical connection to the motor winding can be made efficiently.

It is a figure which shows 1st embodiment of this invention, (a) is a top view, (b) is a side view. It is sectional drawing which shows the use condition of the embodiment. It is a disassembled perspective view of the same embodiment. It is sectional drawing along the AA line of the embodiment. (A) is sectional drawing of the principal part of the embodiment, (b) is a bottom view. It is sectional drawing of the principal part which shows 2nd embodiment of this invention.

  (First embodiment)

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an electric pump 1 according to the present embodiment. As shown in FIG. 2, the electric pump 1 is attached to an automatic transmission 2 such as an AT or a CVT of an automobile and is in an idle stop state. The decreasing oil pressure is maintained at a predetermined pressure.

  That is, a hydraulic circuit is formed in the automatic transmission 2, and a hydraulic path 12 for forming the hydraulic circuit is formed in the casing 11 of the automatic transmission 2. A mounting hole 14 for mounting the electric pump 1 is opened on the outer surface 13 of the casing 11, and is configured to be mounted in a state where the tip end portion of the electric pump 1 is inserted into the mounting hole 14. Yes.

  Oil 21 used for control of the automatic transmission 2 circulates in the hydraulic path 12, and a back surface 22 of the mounting hole 14 has a communication path 23 communicating with an oil storage portion (not shown), and an additional pressure. An output path 24 for outputting the pressurized oil 21 is opened.

  FIG. 3 is an exploded perspective view showing the electric pump 1. The electric pump 1 includes a pump component 31 that constitutes the pump, a motor component 32 that drives the pump component 31, and the motor component. And a motor drive control unit 33 for controlling 32. The pump component 31, the motor component 32, and the motor drive controller 33 are arranged in the extending direction of the rotating shaft 34 that constitutes the motor component 32, and extend from the motor component 32. As shown in FIG. 4, the rotating shaft 34 is configured to be connected to the pump component 31 in the assembled state.

  The electric pump 1 includes a cylindrical case 41 that constitutes an outer peripheral portion, and the pump component 31 and the motor component 32 are fitted in the case 41. In this internal fitting state, the outer peripheral surface of the pump component 31 and the outer peripheral surface of the motor component 32 are configured to contact the inner surface 42 of the case 41, and in this surface contact state, the pump The component 31 and the motor component 32 are configured to be positioned.

  A case flange portion 51 extending outward is integrally formed at the base end of the case 41, and the electric pump 1 has a distal end than the case flange portion 51 as shown in FIGS. 1 and 2. The side constitutes an insertion region 52 to be inserted into the mounting hole 14 provided in the casing 11, and the base end side from the case flange 51 forms a protruding region 53 projecting from the casing 11. (See FIG. 1).

  In a state where the electric pump 1 is attached to the attachment hole 14, the case flange portion 51 is configured to come into contact with the outer surface 13 of the casing 11, and the case flange portion 51 allows the electric pump 1 to be in contact with the outer surface 13. The casing 11 can be fixed.

  The pump component 31 and the motor component 32 are arranged on the distal end side of the case 41 with respect to the case flange portion 51 constituting the insertion region 52, and the attachment shown in FIG. In the state, the front end surface of the pump component 31 protruding from the case 41 is configured to face the back surface 22 of the mounting hole 14.

  As shown in FIG. 5, the tip of the case 41 is bent toward the center of the case 41, and a circular hole 62 is formed inside the bent portion 61. A rectangular first claw portion 64 and a second claw portion 65 extending toward the center 63 are integrally formed at the edge of the bent portion 61, and the second claw portion 65 is The first claw portion 64 is provided at a position shifted by a predetermined angle α from the facing position where the first claw portion 64 faces.

  As shown in FIGS. 3 and 4, the pump component 31 includes a pump base 71 that constitutes the distal end side, and a pump housing 72 that is disposed on the proximal end side of the pump base 71, An O-ring 73 is disposed between the pump housing 72 and the pump base 71. As shown in FIG. 4, a circular projecting portion 74 that is inserted into the circular hole 62 of the case 41 and projects to the outside is integrally formed on the front end surface of the pump base 71. Is configured such that the protrusion 74 is prevented from coming out to the tip side while being supported by the bent portion 61.

  As shown in FIG. 5, the protrusion 74 has a rectangular first recess 81 that engages with the first claw 64 provided in the case 41, and an engagement with the second claw 65. A rectangular second recess 82 is formed, and the claw portions 64 and 65 are engaged with the recesses 81 and 82, so that the pump base 71 in the circumferential direction with respect to the case 41 is engaged. A detent is configured to prevent rotation.

  At this time, the second recess 82 is also provided at a position shifted by a predetermined angle α from the facing position where the first recess 81 faces. Thereby, the assembly position of the pump base 71 with respect to the case 41 can be specified at the time of assembly.

  One end portion of a pin 91 is inserted into the base end surface of the pump base 71, and the other end portion of the pin 91 is placed on the front end surface of the pump housing 72 arranged to face the pump base 71. Has been inserted. Accordingly, the pump housing 72 is positioned with respect to the pump base 71. In this state, the pump housing 72 is press-fitted and fixed to the case 41, and the outer peripheral surface of the pump base 71 is The case 41 is fixed in close contact with the inner surface 42.

  As shown in FIG. 4, the central portion of the pump housing 72 is immersed, and a rotor accommodating portion 101 is formed between the pump housing 72 and the pump base 71. A pump rotor outer 102 is rotatably accommodated in the rotor accommodating portion 101, and a pump rotor inner 103 is rotatably accommodated in the pump rotor outer 102.

  A suction port 111 and a discharge port 112 provided in the pump base 71 communicate with the rotor accommodating portion 101, and both ports 111, 112 are opened at the end surface of the projecting portion 74 of the pump base 71. Is configured to do.

  As shown in FIG. 2, the suction port 111 is connected to the communication path 23 provided in the back surface 22 of the mounting hole 14 in a state where the electric pump 1 is mounted in the mounting hole 14. The discharge port 112 is configured to be connected to the output path 24 via an O-ring 121.

  As a result, the pump rotor outer 102 rotates as the pump rotor inner 103 rotates, so that the oil sucked from the communication path 21 through the suction port 111 is pressurized and the discharge port 112 A trochoid pump that outputs to the output path 24 is formed.

  On the base end side of the trochoid pump, as shown in FIG. 4, a DC motor constituted by the motor constituting portion 32 is disposed. The DC motor includes a motor case 201 that forms an outer peripheral portion, and the outer peripheral surface of the motor case 201 is fixed in a state of being in close contact with the inner side surface 42 of the case 41.

  A coil 212 around which a motor winding 211 is wound is fitted inside the motor case 201, and a stator 213 excited by the coil is held in the coil 212. A motor rotor core 214 is rotatably accommodated inside the stator 213, and a magnet 215 is provided on the outer peripheral surface of the motor rotor core 214. The rotation shaft 34 is inserted into the motor rotor core 214, and the rotation shaft 34 is fixed in a state of penetrating the motor rotor core 214.

  The other end portion of the rotating shaft 34 extends toward the front end side, and the rotating shaft 34 is inserted through the center hole 222 of the pump housing 72 through the oil seal 221 to be inside the rotor accommodating portion 101. It is comprised so that it may protrude. A flat surface 223 is formed on the peripheral surface of the rotating shaft 34 protruding from the rotor accommodating portion 101, and a rotor connecting portion 224 having a D-shaped cross section is formed. The rotor connecting portion 224 is inserted into the D-shaped hole 225 of the pump rotor inner 103 accommodated in the rotor accommodating portion 101 and is then freely rotatable to the counterbore hole 227 of the pump base 71 via the front end side bearing 226. It is supported in the state accommodated in the.

  The motor drive control unit 33 is disposed on the base end side of the DC motor configured by the motor configuration unit 32, and the motor drive control unit 33 is connected to the base end portion of the motor configuration unit 32. Insulator 301 is provided.

  The insulator 301 is made of synthetic resin, and is integrally formed with a motor connecting portion 311 that is inserted into the base end portion of the motor case 201 of the motor constituting portion 32 and connected in an internally fitted state. A bearing hole 312 is provided on the end face of the motor connection portion 311, and a bearing is attached to the bearing hole 312 via a wave washer 313 to form a base end side bearing 314. One end of the rotating shaft 34 that protrudes through the motor rotor core 214 of the motor component 32 is connected to the base end side bearing 314 and is fixed by a C ring 315, and one end of the rotating shaft 34 is fixed. The portion is rotatably supported by the base end side bearing 314.

  Bus bars 321,... For relaying energization to the motor winding 211 are insert-molded in the motor connection portion 311, and the bus bars 321,. The motor winding 211 is electrically connected.

  In addition, a connector portion 322 that protrudes upward and has a harness connection hole 324 opened to the side is integrally formed on the side edge portion of the motor connection portion 311, and is formed on the back surface of the connector portion 322. The connection terminals 323 and 323 that are electrically connected to the harness are insert-molded.

  A plurality of support columns 333,... Are erected on the end surface of the motor connection unit 311, and a control board 334 is supported by the support columns 333,. The control board 334 includes an electronic circuit, and the bus bar 321 is based on a signal input from the connector unit 322 in a state where the harness extended from an external device is connected to the connector unit 322. The motor drive control can be performed by controlling the output signal to.

  The motor drive control unit 33 includes a container-like controller cover 331 attached to the base end portion of the case 41, and the control board 334 supported by the motor connection unit 311 is configured by the controller cover 331. It is comprised so that it may be covered with.

  The controller cover 331 is made of aluminum, and a plurality of cooling fins 341,... Are provided on the outer surface of the controller cover 331 to release heat generated inside (see FIG. 1 and 3).

  As shown in FIG. 4, an engagement recess 351 is formed in the base end portion of the connector portion 322 of the insulator 301, and the connector portion 322 is located on the end side from the engagement recess 351. A stepped portion 352 that is slightly lower than the general portion at the base end is formed. An extension piece 353 on one end side of the controller cover 331 that overlaps with the base end portion of the connector portion 322 is configured to extend on the stepped portion 352, and at the tip of the extension piece 353. The engaging convex portion 354 that engages with the engaging concave portion 351 is bent.

  As a result, the meshing structure in which the engagement convex portion 354 of the controller cover 331 is engaged with the engagement concave portion 351 of the connector portion 322 is engaged with the engagement convex portion 354 and the engagement concave portion. 351. At the time of assembly, a sealing agent 361 is applied to a joint portion between the engagement concave portion 351 and the engagement convex portion 354, and the engagement convex portion 354 and the engagement concave portion 351 are engaged with each other. It is configured as follows.

  Further, on the other end side of the controller cover 331, a cover flange portion 371 extending in a lateral direction from a portion externally fitted to the motor case 201 in a mounted state corresponds to the case flange portion 51. The sealing agent 361 is applied to the surface of the contact portion between the cover flange portion 371 and the case flange portion 51 and the outer fitting portion that is externally fitted to the motor case 201 during assembly. Has been.

  A bolt insertion hole 381 is formed in the cover flange portion 371 and the case flange portion 51 that is in contact with the cover flange portion 371, and a collar 382 is fitted in the bolt insertion hole 381.

  Thus, as shown in FIG. 2, the bolt 391 inserted through the collar 382 in the bolt insertion hole 381 in a state where the case flange portion 51 is in contact with the outer surface 13 of the casing 11 at the time of mounting. The electric pump 1 can be fixed to the casing 11 by being screwed into a screw hole 392 formed in the casing 11.

  In the present embodiment according to the above configuration, the pump component 31 that constitutes the trochoid pump and the motor component 32 that drives the pump component 31 extend in the direction in which the rotating shaft 34 of the motor component 32 extends. The rotating shaft 34 extending from the motor component 32 is connected to the pump rotor inner 103 of the pump component 31.

  The pump component 31 and the motor component 32 are fitted in a cylindrical case 41, and the outer peripheral surface of the pump component 31 and the outer peripheral surface of the motor component 32 are the case. It is positioned in a state of being in contact with the inner side surface 42 of 41.

  For this reason, in a state where the pump component 31 and the motor component 32 are fitted in the case 41, the pump component 31 is based on the inner side surface 42 of the case 41 whose outer peripheral surface is in contact. The central axis can be positioned. The motor component 32 can also position the central axis with reference to the inner side surface 42 of the case 41 where the outer peripheral surface is in contact, and the inner side surface 42 of the case 41 where the outer peripheral surface is in contact. As a reference, the center positions of the pump component 31 and the motor component 32 can be determined.

  Thereby, the rotation shaft 34 extending from the motor component 32 can be easily centered, and shaft misalignment in the pump component 31 and the motor component 32 can be reliably prevented.

  Therefore, the rotating shaft 34 extended from the motor component 32 is easier to assemble than the conventional method in which the rotating shaft 34 must be assembled to the pump rotor of the pump component 31, and the assembly accuracy is improved. Improvements can be made.

  And since the axial shift | offset | difference in the said pump structure part 31 and the said motor structure part 32 can be prevented, rotation loss can also be prevented and rotation efficiency can also be improved.

  Further, when the electric pump 1 is attached to the automatic transmission 2, the front end side of the case 41 in which the pump component 31 and the motor component 32 are disposed is provided in the casing 11 of the automatic transmission 2. The suction port 111 and the discharge port 112 of the pump base 71 constituting the distal end side of the pump component 31 are connected to the hydraulic path 12 provided in the inner surface 22 of the mounting hole 14. At the same time, the case flange portion 51 provided on the rear end side of the case 41 is fixed in a state of being in contact with the outer surface 13 of the casing 11.

  Then, the electric pump 1 has the automatic transmission in a state where the front end side of the case 41 where the pump component 31 and the motor component 32 are disposed is disposed in the casing 11 of the automatic transmission 2. It is attached to the machine 2.

  At this time, the electric pump 1 is in a state in which the insertion region 52 on the distal end side of the case 41 where the pump component 31 and the motor component 32 are disposed is disposed in the casing 11 of the automatic transmission 2. And attached to the automatic transmission 2.

  For this reason, at the time of attachment, the protrusion amount from the outer surface 13 of the casing 11 can be suppressed as compared with the conventional case where the electric pump protrudes from the casing over the entire length. Thereby, even in an environment where the installation space is limited, installation is possible while preventing interference with others.

  On the other hand, when the electric pump 1 is assembled, the pump component 31 is fitted into the case 41. At this time, a first claw portion 64 and a second claw portion 65 extending toward the center of the case 41 are provided at the tip of the case 41, and the pump constituting the pump component 31 The end surface of the base 71 is formed with a first concave portion 81 and a second concave portion 82 that engage with the first claw portion 64 and the second claw portion 65 to constitute a rotation stopper.

  For this reason, inadvertent rotation of the pump base 71 with respect to the case 41 can be prevented.

  At this time, one end portion and the other end portion of the pin 91 are inserted into the pump base 71 and the pump housing 72 facing the pump base 71, and the pump housing 72 is careless with respect to the pump base 71. The rotation can be prevented.

  Accordingly, it is possible to reliably prevent displacement of the pump base 71 and the pump housing 72 with respect to the case 41 in the rotation direction.

  The rotation-prevented pump housing 72 is press-fitted into the case 41 and fixed. Thereby, the movement of the pump base 71 and the pump housing 72 in the removal direction can be prevented, the anti-rotation effect by the both claw portions 64 and 65 and the both concave portions 81 and 82, and the pin 91 The anti-rotation effect between the pump base 71 and the pump housing 72 can be maintained.

  As described above, the pump component 31 including the pump base 71 and the pump housing 72 can be easily formed in the case 41.

  For this reason, the assemblability is improved as compared with the case where the case 41, the pump base 71, and the pump housing 72 must be assembled while being aligned. Moreover, since each component can be individually formed, the processability of each component can be improved, which can contribute to cost reduction.

  Further, one end portion that penetrates through the motor rotor core 214 of the motor component 32 and the pump rotor inner 103 of the pump component 31 and protrudes through the motor rotor core 214 is interposed via a proximal bearing 314. The other end of the rotating shaft 34 that is supported and protrudes through the pump rotor inner 103 is supported by the pump base 71 via a tip-side bearing 226.

  Thereby, since both ends of the rotating shaft 34 are rotatably supported, the supporting force can be increased and the effect of preventing the shaft misalignment can be further enhanced as compared with the case where the midway portion is supported. be able to.

  Further, the motor drive control unit 33 adjacent to the motor configuration unit 32 in a state arranged in the extending direction of the rotating shaft 34 of the motor configuration unit 32 is connected to a base end portion of the motor configuration unit 32. The insulator 311 is provided with bus bars 321,... For relaying energization to the motor winding 211. Therefore, by using the bus bars 321,..., Electrical connection with the DC motor can be easily and efficiently performed without drawing a harness or the like.

  The insulator 301 is provided with a connector portion 322 for connecting an external device, and the control board 334 supported by the insulator 301 is protected with a controller cover 331 attached to the case 41. can do.

  At this time, the controller cover 331 is provided with cooling fins 341,..., And heat generated inside can be released to the outside through the cooling fins 341,. Thereby, a cooling effect can be improved and the malfunction resulting from heat can be prevented beforehand.

  On the other hand, an engagement concave portion 351 is provided at the base end portion of the connector portion 322 of the insulator 301, and the engagement convex portion 354 provided on the controller cover 331 when the controller cover 331 is attached. Can be engaged with the engaging recess 351 to engage with each other, thereby preventing inadvertent detachment.

  At the time of assembly, the engagement convex portion 354 and the engagement concave portion 351 are engaged with each other in a state where the sealing agent 361 is applied to the joint portion between the engagement concave portion 351 and the engagement convex portion 354, so that the engagement is performed. The mating portion can be sealed, and the effect of reinforcing the connector portion 322 base end portion can also be obtained.

Since the insulator 301 provided with the bus bars 321,... For supporting the control board 334 and relaying the energization to the motor winding 211 is provided with a connector portion 322 for connecting external equipment, Electrical connection from the device to the motor winding 211 via the control board 334 can be performed efficiently.

  (Second embodiment)

  FIG. 6 is a diagram showing a second embodiment of the present invention, in which the same or similar parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different parts are described. .

  That is, as shown in FIG. 4, one end of the rotating shaft 34 protrudes through the motor rotor core 214 of the motor component 32 and is rotatably supported by the base end side bearing 314. As shown in FIG. 6, the rotor connecting portion 224 having a D-shaped cross section is connected to the pump rotor inner 103 at the other end of the rotating shaft 34.

  An outer fitting portion 401 that protrudes upward in FIG. 6 and is externally fitted to the rotary shaft 34 is formed on the end surface of the pump rotor inner 103, and the outer fitting portion 401 is formed on the pump housing 72. The inner fitting hole 402 is rotatably inserted.

  Thereby, the front end side bearing 411 that rotatably supports the front end portion of the rotating shaft 34 by the outer fitting portion 401 of the pump rotor inner 103 and the inner fitting hole 402 provided in the pump housing 72 is provided. The rotating shaft 34 is rotatably supported by the pump housing 72 via the front end side bearing 411.

  In the above configuration, one end portion of the rotating shaft 34 passes through the motor rotor inner 103 of the motor constituting portion 32, and a protruding portion thereof is rotatably supported via the base end side bearing 314. On the other hand, the other end portion of the rotating shaft 34 is connected to the pump rotor inner 103, and the pump rotor inner 103 is rotatably supported by the pump housing 72 via a front end side bearing 411.

  Thus, in addition to the effects of the first embodiment, the pump rotor inner 103 that rotates is directly supported by the tip-end bearing 411, and the other end of the rotary shaft 34 is supported by the pump rotor inner 103. The effect that it can support through can be show | played.

DESCRIPTION OF SYMBOLS 1 Electric pump 2 Automatic transmission 11 Casing 12 Hydraulic path 13 Outer surface 14 Mounting hole 22 Back surface 31 Pump component part 32 Motor component part 33 Motor drive control part 34 Rotating shaft 41 Case 42 Inner side surface 51 Case flange 63 Center 64 First claw Part 65 Second claw part 71 Pump base 72 Pump housing 81 First concave part 82 Second concave part 102 Pump rotor outer 103 Pump rotor inner 111 Suction port 112 Discharge port 211 Motor winding 214 Motor rotor core 226 Tip side bearing 301 Insulator 314 Base end Side bearing 321 Bus bar 322 Connector portion 334 Control board 331 Controller cover 341 Cooling fin 351 Engaging recess 354 Engaging projection 361 Sealing agent 411 Tip side bearing

Claims (6)

A pump component that constitutes the pump, a motor component that drives the pump component, and a motor drive control unit that controls the motor component in the extending direction of the rotating shaft that constitutes the motor component An electric pump arranged and connected to a pump rotor of the pump component, wherein the rotating shaft extending from the motor component is,
The pump component and the motor component are internally fitted in a cylindrical case, and the pump is configured such that the outer peripheral surface of the pump component and the outer peripheral surface of the motor component are in contact with the inner surface of the case. An electric pump characterized by positioning a component and the motor component. A flange portion fixed to the outer surface of the casing of the automatic transmission is provided on the rear end side of the case, and the flange portion is inserted in a mounting hole provided in the casing at a front end side from the flange portion. It can be fixed to the outer surface,
The pump component and the motor component are arranged on the distal end side of the case with respect to the flange portion, and an intake port and a discharge port connected to a hydraulic path provided in the inner surface of the attachment hole in an attached state are provided. The electric pump according to claim 1, wherein the pump base comprises a tip side of the pump component. A first claw portion and a second claw portion that extend toward the center of the case are provided at the tip of the case, and a first recess and a second portion that engage with the first claw portion and the second claw portion. While forming a recess in the end face of the pump base to constitute a detent,
The pump base is positioned with respect to the pump base by a pin having one end inserted into the pump base and the other end inserted into a pump housing disposed opposite the pump base. The electric pump according to claim 2, wherein the housing is press-fitted and fixed to the case.   One end portion of the rotating shaft protrudes through the motor rotor of the motor constituent portion and is rotatably supported through a base end side bearing, while the other end portion of the rotating shaft is supported by the pump rotor of the pump constituent portion. 4. The electric pump according to claim 2, wherein the electric pump protrudes through the shaft and is supported by the pump base via a tip side bearing.   One end of the rotating shaft protrudes through the motor rotor of the motor component and is rotatably supported through a base end bearing, while the pump rotor to which the other end of the rotating shaft is connected is The electric pump according to claim 3, wherein the electric pump is rotatably supported by the pump housing via a side bearing. The motor drive controller is
A resin insulator connected to a base end portion of the motor component and provided with a connector for connecting a bus bar and an external device to relay energization to the motor winding;
A control board that is supported by the insulator and controls motor output by controlling an output signal to the bus bar based on a signal from the connector part;
A controller cover that is attached to the end of the case so as to cover the control board and provided with cooling fins for releasing heat generated inside;
With
An engagement recess is provided at a base end portion of the connector portion of the insulator, and an engagement protrusion that engages with the engagement recess is provided on the controller cover to form a meshing structure, and the engagement recess and the The electric pump according to any one of claims 1 to 5, wherein a sealant is applied to a joint portion with the engaging convex portion and meshed with the engaging convex portion and the engaging concave portion.

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