JP6682769B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device.

  For example, Patent Document 1 describes an electric pump attached to an automatic transmission.

JP, 2011-94553, A

  The electric pump (pump device) as described above is, for example, partly inserted into a mounting hole provided in the casing, and the flange portion of the case is fixed to the outer surface of the casing of the automatic transmission, so that the automatic transmission is Attached to. The electric pump has a suction port (suction port) and a discharge port (discharge port). A hydraulic path is provided on the inner surface (bottom surface) of the mounting hole, and the suction port and the discharge port of the electric pump are connected thereto.

  The vibration of the automatic transmission is transmitted to the electric pump via the flange portion. The vibration transmitted to the electric pump is amplified and transmitted as the distance from the flange portion increases. Therefore, the vibration of the automatic transmission is likely to be largely transmitted to the suction port and the discharge port connected to the hydraulic path provided on the inner surface of the mounting hole. As a result, there is a problem that the O-rings and the like provided at the connection points between the suction port and the discharge port and the hydraulic path are easily worn due to friction.

  In view of the above problems, it is an object of one aspect of the present invention to provide a pump device having a structure capable of suppressing the transmission of vibration to the suction port and the discharge port.

One aspect of a pump device of the present invention is a motor unit having a shaft having a central axis extending in an axial direction as a center, a rotor fixed to the shaft, and a stator positioned radially outside the rotor, and the motor. A pump portion that is located on one axial side of the portion and that is driven by the motor portion; and a tubular housing that holds the motor portion and the pump portion, and the pump portion is attached to the shaft. An inner rotor, an annular outer rotor surrounding a radially outer side of the inner rotor, a pump body accommodating the inner rotor and the outer rotor, and a pump cover attached to one axial side of the pump body. And the pump body is recessed from the surface on the one side in the axial direction to the other side in the axial direction. A pump chamber accommodating the water rotor, and a through hole that axially penetrates the pump body and through which the shaft passes, and the pump cover has an intake port and a discharge port that communicate with the pump chamber. The housing has a tubular portion that covers at least a radial outer side of the stator, and a flange portion that extends radially outward from an end portion of the tubular portion on the other axial side, and the pump body includes the tubular body. located in one axial direction than the part has an exposed portion exposed to the outside of the housing, the exposed portion is supported on the pump unit housing portion of the vehicle body, and a radially outer side of the central axis It has an enclosing outer surface.

According to one aspect of the present invention, the exposed portion and the pump device housing portion on the vehicle body side are supported in the vicinity of the suction port and the discharge port, and vibration on the vehicle body side transmitted from the housing flange portion to the pump device is Provided is a pump device having a structure capable of suppressing the transmission to the suction port and the discharge port .

that's all

FIG. 1 is a sectional view showing the pump device according to the first embodiment. FIG. 2 is a view showing a part of the pump device according to the first embodiment and is a sectional view taken along line II-II in FIG. 1. FIG. 3 is a sectional view showing a part of a pump device which is another example of the first embodiment. FIG. 4 is a sectional view showing a part of a pump device which is another example of the first embodiment. FIG. 5: is sectional drawing which shows the part of the pump apparatus of 2nd Embodiment. FIG. 6 is a view showing a part of the pump device according to the second embodiment, and is a sectional view taken along line VI-VI in FIG.

  Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments and can be arbitrarily modified within the scope of the technical idea of the present invention. Further, in the following drawings, the scale and the number of each structure may be different from the scale and the number of the actual structure in order to make each structure easy to understand.

  In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Y-axis direction is parallel to the axial direction of the central axis J shown in FIG. The Z-axis direction is the direction orthogonal to the Y-axis direction and is the vertical direction in FIG. The X-axis direction is a direction orthogonal to both the Y-axis direction and the Z-axis direction.

  Further, in the following description, the Z-axis direction orthogonal to the direction in which the central axis J extends is defined as the vertical direction. The positive side (+ Z side) in the Z-axis direction may be referred to as “upper side”, and the negative side (−Z side) in the Z-axis direction may be referred to as “lower side”. It should be noted that the up-down direction, the upper side, and the lower side are merely names used for description, and do not limit the actual positional relationship or direction.

In the following description, the positive side in the Y-axis direction (+ Y side) may be referred to as the “counter output side (the other side in the axial direction)”, and the negative side in the Y-axis direction (−Y side). It may be called "output side (one side in the axial direction)". Unless otherwise specified, a direction parallel to the central axis J (Y-axis direction) may be simply referred to as “axial direction”, and a radial direction around the central axis J may be simply referred to as “radial direction”. In some cases, the circumferential direction around the central axis J (θ _Y direction), that is, the circumference of the central axis J may be simply referred to as the “circumferential direction”.

  In the present specification, “extending in the axial direction” includes not only strictly extending in the axial direction but also extending in a direction inclined at an angle of less than 45 ° with respect to the axial direction. In addition, in the present specification, “extending in the radial direction” means not only extending in the strictly radial direction, that is, the direction perpendicular to the axial direction, but also inclining in the range of less than 45 ° with respect to the radial direction. It also includes the case of extending in the vertical direction.

<First Embodiment>
FIG. 1 is a cross-sectional view showing a pump device 10 of this embodiment. As shown in FIG. 1, the pump device 10 is fixed to the vehicle body CB1. The vehicle body CB1 is a component that constitutes the vehicle. The vehicle body CB1 is not particularly limited and is, for example, an automatic transmission.

  The pump device 10 includes a case 11, a motor unit 20, and a pump unit 30. The case 11 accommodates the motor unit 20 and the pump unit 30 inside. The case 11 has a housing 12 and a motor cover 13. That is, the pump device 10 includes the housing 12 and the motor cover 13.

  Note that in the present specification, that a certain object is housed includes that a part of the certain object is housed in addition to the whole of the certain object being housed. That is, for example, that the case 11 accommodates the motor unit 20 and the pump unit 30 may mean that the motor unit 20 and the pump unit 30 are partly located outside the case 11.

  The housing 12 has a tubular shape that holds the motor unit 20 and the pump unit 30. The housing 12 extends in the axial direction (Y-axis direction). The housing 12 is made of metal, for example. The housing 12 is manufactured by pressing, for example.

  The housing 12 includes a housing tubular portion (tubular portion) 14, a housing flange portion (flange portion) 15, and an extending portion 16. The housing tubular portion 14 has a tubular shape that covers at least a radial outer side of a stator 50 described later. The housing tubular portion 14 has, for example, a multi-stage cylindrical shape centered on the central axis J. The housing tubular portion 14 opens on both sides (± Y side) in the axial direction. The diameter of the housing tubular portion 14 gradually decreases from the opposite output side (+ Y side) to the output side (−Y side).

  The housing flange portion 15 extends outward in the radial direction from the end portion on the opposite output side (+ Y side) of the housing tubular portion 14. The extending portion 16 extends radially inward from the output side (−Y side) end of the housing tubular portion 14.

  The motor cover 13 is fixed to the opposite output side (+ Y side) of the housing 12. The motor cover 13 has a cover cylinder portion 17, a lid portion 18, and a cover flange portion 19. The cover tubular portion 17 has a tubular shape that covers a radially outer side of a bus bar unit 80 described later. The lid portion 18 is connected to the counter output side (+ Y side) of the cover tubular portion 17. The lid portion 18 has, for example, a flat plate shape. The lid portion 18 is located on the opposite output side of the bus bar unit 80. The lid portion 18 closes an opening on the opposite output side of the holder main body portion 82, which will be described later.

  The cover flange portion 19 extends radially outward from the output side (−Y side) end of the cover tubular portion 17. The output side surface of the cover flange portion 19 and the counter output side (+ Y side) surface of the housing flange portion 15 are in contact with each other. The cover flange portion 19 and the housing flange portion 15 are, for example, crimped and fixed in the axial direction (Y-axis direction). As a result, the housing 12 and the motor cover 13 are fixed.

  The motor unit 20 includes a shaft 41, a counter output side bearing 44, a rotor 40, a stator 50, a bus bar unit 80, a circuit board 70, a rotation sensor 71, and a sensor magnet 72.

The shaft 41 is centered on a central axis J extending in the axial direction (Y-axis direction). The output side (−Y side) end of the shaft 41 extends to the pump unit 30. The shaft 41 is rotatably supported around the axis (± θ _Y direction) by a counter output side bearing 44 and a bearing portion 36 of the pump body 31 described later.

  The counter output side bearing 44 is located on the counter output side (+ Y side) with respect to the stator 50. The counter output side bearing 44 is, for example, a rolling bearing. The counter output side bearing 44 is held by a bus bar holder 81 of the bus bar unit 80, which will be described later.

The rotor 40 is fixed to the shaft 41. The rotor 40 has a rotor core 42 and a rotor magnet 43. The rotor core 42 surrounds the shaft 41 around the axis (θ _Y direction) and is fixed to the shaft 41. The rotor magnet 43 is fixed to the outer surface of the rotor core 42 along the axis thereof. The rotor core 42 and the rotor magnet 43 rotate together with the shaft 41.

  The stator 50 is located radially outside the rotor 40. The stator 50 has a stator core 51, an insulating member 52, and a coil 53. The stator core 51 has a core back portion 51a and a tooth portion 51b.

  The core back portion 51a has, for example, a cylindrical shape that is concentric with the shaft 41. The core back portion 51a is fixed to the inner peripheral surface of the housing tubular portion 14. The teeth portion 51b extends from the inner side surface of the core back portion 51a toward the shaft 41. A plurality of teeth portions 51b are provided and arranged at equal intervals along the circumferential direction.

  The insulating member 52 is attached to each tooth 51b. The coil 53 is attached to the tooth portion 51b via the insulating member 52. The coil 53 is formed by winding a conductive wire.

  The bus bar unit 80 is located on the opposite output side (+ Y side) of the stator 50. The busbar unit 80 includes a busbar holder 81, a compatible busbar 90, and a sensor busbar 91.

  The bus bar holder 81 holds the compatible bus bar 90 and the sensor bus bar 91. The bus bar holder 81 has a holder main body portion 82 and a connector portion 83. The holder body 82 has, for example, a cylindrical shape that is concentric with the shaft 41. The holder main body portion 82 is located in the opening 14a on the opposite output side (+ Y side) of the housing tubular portion 14. The output side (-Y side) end of the holder main body 82 is located inside the housing tubular portion 14 in the radial direction. An O-ring 84 is provided between the holder main body portion 82 and the housing tubular portion 14 over the entire circumference in the circumferential direction.

  The opening on the counter output side (+ Y side) of the holder main body 82 is closed by the lid 18. An O-ring 85 is provided between the counter output side surface of the holder body 82 and the lid 18. The O-ring 85 surrounds the opening on the side opposite to the output side of the holder body 82 over the entire circumference.

  The holder main body portion 82 has a holding portion that holds the counter-output side bearing 44 in the central portion. The connector part 83 projects radially outward from the holder body part 82. In the example of FIG. 1, the connector part 83 projects downward from the holder body part 82 (−Z side). The connector portion 83 has a connector recess 83a that opens downward and is recessed upward. An external power source (not shown) is connected to the connector section 83.

  The phase bus bar 90 is electrically connected to the coil 53. The sensor bus bar 91 is electrically connected to the circuit board 70. One end of the compatible bus bar 90 and one end of the sensor bus bar 91 are projected downward (−Z side) from the bottom surface of the connector recess 83a.

  The circuit board 70 is fixed to the holder body 82. The circuit board 70 is housed inside the holder main body 82 in the radial direction. In the example of FIG. 1, the board surface of the circuit board 70 is, for example, orthogonal to the axial direction (Y-axis direction).

  The rotation sensor 71 is attached to the surface on the output side (−Y side) of the circuit board 70. The rotation sensor 71 is, for example, a Hall element. The rotation sensor 71 faces the sensor magnet 72 in the axial direction (Y-axis direction).

  The sensor magnet 72 is fixed to the shaft 41. In the example of FIG. 1, the sensor magnet 72 is fixed to the outer peripheral surface of the end portion on the opposite output side (+ Y side) of the shaft 41 via a mounting member. The sensor magnet 72 has, for example, an annular shape. The magnetic poles of the sensor magnet 72 are provided with N poles and S poles alternately along the circumferential direction.

  The pump unit 30 is located on the output side (−Y side) of the motor unit 20. The pump unit 30 is driven by the motor unit 20. The pump unit 30 includes a pump body 31, a pump cover 32, an inner rotor 61, and an outer rotor 62.

  The pump body 31 is fixed to the inner surface of the housing tubular portion 14. The pump body 31 is made of metal, for example. The pump body 31 is manufactured by cutting, for example. The pump body 31 has a pump chamber 33, an oil seal holding portion 31b, a through hole 31a, a bearing portion 36, and an exposed portion 34.

  The pump chamber 33 is recessed from the output side (−Y side) surface of the pump body 31 to the opposite output side (+ Y side). The pump chamber 33 accommodates the inner rotor 61 and the outer rotor 62 inside. That is, the pump body 31 houses the inner rotor 61 and the outer rotor 62. The output side (−Y side) of the pump chamber 33 is closed by the pump cover 32.

  FIG. 2 is a diagram showing a part of the pump device 10 of the present embodiment, and is a sectional view taken along line II-II in FIG. 1. In FIG. 2, the shaft 41, the inner rotor 61, and the outer rotor 62 are not shown. As shown in FIG. 2, the shape of the pump chamber 33 when viewed in the axial direction (Y-axis direction) is, for example, a circular shape. In the example of FIG. 2, the central axis J passes through the center of the pump chamber 33.

  As shown in FIG. 1, the oil seal holding portion 31b is recessed from the surface on the opposite output side (+ Y side) of the pump body 31 to the output side (−Y side). The oil seal 92 is held by the oil seal holding portion 31b. The oil seal 92 prevents the fluid (oil) that has flowed into the oil seal holding portion 31b from the pump chamber 33 through the through hole 31a from entering the motor portion 20.

  The through hole 31a penetrates the pump body 31 in the axial direction (Y-axis direction). The shaft 41 is passed through the through hole 31a. An end of the through hole 31a on the opposite output side (+ Y side) opens to the oil seal holding portion 31b. The output side (−Y side) end of the through hole 31 a opens into the pump chamber 33. As shown in FIG. 2, the shape of the through hole 31a when viewed in the axial direction is, for example, a circular shape concentric with the pump chamber 33.

  As shown in FIG. 1, the bearing portion 36 supports the shaft 41. In the present embodiment, the bearing portion 36 is, for example, a slide bearing. In the example of FIG. 1, the bearing portion 36 is the inner wall portion of the through hole 31a.

  The exposed portion 34 is located on the output side (−Y side) of the housing tubular portion 14. The exposed portion 34 is exposed to the outside of the housing 12. As shown in FIGS. 1 and 2, the exposed portion 34 has a cylindrical shape extending in the axial direction (Y-axis direction). The exposed portion 34 has an outer peripheral surface (outer surface) 34a that surrounds the radially outer side of the central axis J. In the present embodiment, the outer peripheral surface 34a is provided, for example, over one round in the circumferential direction.

  In the present specification, the phrase "the outer peripheral surface of the exposed portion surrounds the outer side in the radial direction of the central axis" is not limited to the case where the outer peripheral surface is provided over one round in the circumferential direction. In the present specification, the phrase "the outer peripheral surface of the exposed portion surrounds the outer side in the radial direction of the central axis" includes, for example, the case where the outer peripheral surface is provided in a part of the circumferential direction. The case where the outer peripheral surface is provided in a part of the circumferential direction includes the case where a plurality of exposed portions are arranged along the circumferential direction and each outer peripheral surface surrounds the radially outer side of the central axis.

  In addition, in the present specification, “the exposed portion has a cylindrical shape” includes the case where the exposed portion has a substantially cylindrical shape. The substantially cylindrical shape includes, for example, a shape in which a part of the cylindrical shape is cut out, a shape in which a portion partially protruding from the cylindrical shape is provided, and the like.

  In this embodiment, the exposed portion 34 and the pump chamber 33 overlap each other in the radial direction. As shown in FIG. 2, the outer peripheral surface 34a of the exposed portion 34 is provided with a pump body side concave portion 34b that is recessed radially inward. The shape of the pump body side recess 34b when viewed in the axial direction (Y-axis direction) is, for example, a rectangular shape. The pump body side recessed portion 34b is provided, for example, over the entire exposed portion 34 in the axial direction.

  As shown in FIG. 1, in the present embodiment, the pump body 31 has a step portion 35 whose radial dimension decreases toward the output side (−Y side). The step surface 35 a that intersects the axial direction (Y-axis direction) of the step portion 35 contacts the extension portion 16. More specifically, in the present embodiment, the step surface 35a contacts the surface on the opposite output side (+ Y side) of the extending portion 16. Therefore, the pump body 31 can be axially positioned with respect to the housing 12.

  In the present embodiment, a portion of the pump body 31 on the side opposite to the output side (+ Y side) of the step surface 35a is press-fitted and fixed in the housing tubular portion 14, for example. In the present embodiment, a portion of the pump body 31 on the output side (−Y side) of the step surface 35a projects to the output side of the housing tubular portion 14. That is, in the present embodiment, the portion of the pump body 31 on the output side (−Y side) of the step surface 35 a is the exposed portion 34.

  An O-ring 38 is provided between the pump body 31 and the tubular housing portion 14 in the radial direction, over the entire circumference.

The inner rotor 61 is attached to the shaft 41. More specifically, in the present embodiment, the inner rotor 61 is fixed to the output side (−Y side) end of the shaft 41. The inner rotor 61 is housed in the pump chamber 33. The inner rotor 61 rotates about the central axis J (± θ _Y direction) as the shaft 41 rotates.

  The outer rotor 62 is a ring that surrounds the radially outer side of the inner rotor 61. The outer rotor 62 is housed in the pump chamber 33. The outer rotor 62 meshes with the inner rotor 61. Therefore, the outer rotor 62 rotates as the inner rotor 61 rotates. The rotation axis of the outer rotor 62 is, for example, parallel to the central axis J and different from the central axis J.

  The pump cover 32 is attached to the output side (−Y side) of the pump body 31. In the present embodiment, the pump cover 32 is fixed to the output side surface of the exposed portion 34 of the pump body 31 with a screw 94, for example. The pump cover 32 covers the output side (−Y side) of the pump chamber 33. The pump cover 32 has a pump cover body 32c and a protrusion 32d.

  The opposite output side (+ Y side) surface of the pump cover body 32c contacts the output side (−Y side) surface of the pump body 31. The protrusion 32d protrudes from the pump cover body 32c to the output side.

  The pump cover 32 has a suction port 32a and a discharge port 32b. The suction port 32a and the discharge port 32b penetrate the pump cover 32 in the axial direction (Y-axis direction). The suction port 32a and the discharge port 32b communicate with the pump chamber 33. In the example of FIG. 1, the suction port 32a is located below (−Z side) the discharge port 32b. The ejection port 32b is located on the protrusion 32d. The discharge port 32b opens to the contact surface 32e which is the output side (-Y side) surface of the protrusion 32d.

  Next, a state in which the pump device 10 is attached to the vehicle body CB1 will be described. The vehicle body CB1 has a pump device housing portion BD1, an import portion IP, and an outport portion OP. The pump device housing portion BD1 is a concave portion that is recessed from the vehicle surface CBS to the output side (−Y side). The pump device 10 is housed in the pump device housing portion BD1. In the present embodiment, the radially inner surface of the pump device housing portion BD1 has a cylindrical shape. The pump device housing portion BD1 has a housing body portion BD1a and a fitting portion BD1b.

  The accommodating main body portion BD1a is a portion where a part of the motor portion 20 is located inside in the radial direction. The accommodating body portion BD1a opens on the vehicle surface CBS. The fitting portion BD1b is located on the output side (−Y side) of the housing body portion BD1a. The diameter of the fitting portion BD1b is smaller than the diameter of the accommodation body portion BD1a. The fitting portion BD1b is fitted to the exposed portion 34.

  As shown in FIG. 2, a vehicle-side convex portion CB1a protruding inward in the radial direction is provided on the inner peripheral surface of the fitting portion BD1b. The shape of the vehicle-side convex portion CB1a when viewed in the axial direction (Y-axis direction) is, for example, a rectangular shape. The vehicle-side convex portion CB1a is provided, for example, over the entire fitting portion BD1b in the axial direction.

  As shown in FIG. 1, the import part IP and the outport part OP open to the bottom surface of the pump device housing portion BD1, that is, the housing portion bottom surface BD1c which is the bottom surface of the fitting portion BD1b. The pump device 10 sucks fluid from the import portion IP and discharges fluid from the outport portion OP. The fluid is not particularly limited and is oil, for example. In the following description, the fluid sent by the pump device 10 will be described as oil.

  In the pump device 10 according to the present embodiment, for example, the housing flange portion 15 and the cover flange portion 19 are overlapped with each other in the axial direction (Y-axis direction), and are screwed to the vehicle body CB1 via the housing flange portion 15 and the cover flange portion 19. Will be stopped. That is, in the present embodiment, the pump device 10 is fixed to the vehicle body CB1 via the housing flange portion 15. The output side (-Y side) surface of the housing flange portion 15 contacts the vehicle surface CBS.

  An O-ring 93 is provided between the housing flange portion 15 and the vehicle surface CBS. The O-ring 93 is provided over the entire circumference.

  A portion of the pump device 10 on the output side (−Y side) of the housing flange portion 15 is inserted into the pump device housing portion BD1. The output-side end of the pump device 10, that is, the output-side end of the pump cover 32 contacts the housing portion bottom surface BD1c. In the present embodiment, the output side end of the pump cover 32 is the contact surface 32e of the protrusion 32d. The pump cover 32 is inserted into the fitting portion BD1b. The pump cover 32 is provided radially inward from the inner surface of the fitting portion BD1b.

  The import part IP is connected to the suction port 32a of the pump cover 32. As a result, oil flows into the pump chamber 33 from the import section IP via the suction port 32a. The outport portion OP is connected to the discharge port 32b of the pump cover 32. As a result, the oil that has flowed into the pump chamber 33 flows out from the outport portion OP via the discharge port 32b.

  An O-ring 37 is provided between the contact surface 32e of the protrusion 32d of the pump cover 32 and the housing portion bottom surface BD1c. The O-ring 37 surrounds the discharge port 32b and the outport portion OP in the circumferential direction. As a result, it is possible to prevent the oil flowing into the pump device 10 from the import portion IP from flowing to the outport portion OP via the contact surface 32e and the housing portion bottom surface BD1c.

  The exposed portion 34 is fitted to the fitting portion BD1b of the pump device housing portion BD1. In the present embodiment, the exposed portion 34 is, for example, fitted in the fitting portion BD1b with a gap. Therefore, according to the present embodiment, it is possible to suppress the vibration of the vehicle body CB1 from being transmitted to the suction port 32a and the discharge port 32b. The details will be described below.

  In order to suppress the vibration of the vehicle body CB1 transmitted through the housing flange portion 15 from being transmitted to the suction port 32a and the discharge port 32b, the pump device 10 may be supported near the suction port 32a and the discharge port 32b. As such a configuration, for example, a configuration in which the outer surface of the housing 12 is fitted to the fitting portion BD1b of the pump device housing portion BD1 and the pump device 10 is supported can be considered.

  However, for example, when the housing 12 is manufactured by press working, it is necessary to accurately form the inner side surface to which the pump body 31 and the stator 50 are fitted, and thus the accuracy of the outer side surface of the manufactured housing 12 is relatively low. Prone. Therefore, when the outer surface of the housing 12 is fitted to the fitting portion BD1b of the pump device housing portion BD1, the pump device 10 cannot be fitted to the fitting portion BD1b with high accuracy. As a result, the pump device 10 cannot be favorably supported by the fitting portion BD1b, and the vibration transmitted to the suction port 32a and the discharge port 32b cannot be sufficiently suppressed.

  On the other hand, according to the present embodiment, the exposed portion 34 of the pump body 31 is fitted to the fitting portion BD1b. The pump body 31 is manufactured by cutting metal, for example. Therefore, the outer peripheral surface 34a of the exposed portion 34 can be accurately formed during cutting. Thereby, the exposed portion 34 and the fitting portion BD1b can be fitted with each other with high accuracy. Therefore, according to this embodiment, the pump device 10 is fixed to the vehicle body CB1 via the housing flange portion 15 and the exposed portion 34 and the fitting portion BD1b are fitted to each other, so that the suction port 32a and the fitting portion BD1b are fitted. It is supported in the vicinity of the discharge port 32b. As a result, the vibration of the vehicle body CB1 transmitted from the housing flange portion 15 to the pump device 10 is suppressed from being largely transmitted to the suction port 32a and the discharge port 32b located on the output side (−Y side) of the exposed portion 34. .

  As described above, according to the present embodiment, it is possible to obtain the pump device 10 having a structure capable of suppressing the transmission of vibration to the suction port 32a and the discharge port 32b. As a result, it is possible to prevent the O-ring 37 that seals around the discharge port 32b from being rubbed and worn by vibration.

  Further, for example, the outer surface of the housing 12 can be accurately formed by performing additional processing on the outer surface of the housing 12 manufactured by press working. In this case, the outer surface of the housing 12 can be fitted to the fitting portion BD1b with high accuracy.

  However, in this case, it is necessary to chuck the housing 12 manufactured by press working on a lathe or the like for additional machining, which is troublesome. Therefore, the manufacturing cost of the pump device 10 increases.

  On the other hand, according to the present embodiment, the outer peripheral surface 34a of the exposed portion 34 of the pump body 31 manufactured by, for example, metal cutting may be accurately processed. Therefore, in the manufacturing process by cutting, it is only necessary to additionally process the outer peripheral surface 34a of the pump body 31 already chucked on the lathe or the like, which is simple. As a result, according to the present embodiment, it is not necessary to change the machine tool for processing the member in order to form the portion fitted with the fitting portion BD1b, and the labor and cost for manufacturing the pump device 10 are increased. Can be suppressed.

  Further, for example, a configuration in which the protrusion 32d of the pump cover 32 is fitted to the outport portion OP or the like to support the pump device 10 is also conceivable. However, in that case, unless the diameter of the protruding portion 32d is made sufficiently large, the protruding portion 32d may be deformed or damaged by the stress due to the vibration of the vehicle body CB1. Therefore, the diameter of the protruding portion 32d needs to be relatively large, which may increase the size of the entire pump device 10.

  On the other hand, according to the present embodiment, since the exposed portion 34 of the pump body 31 is fitted to the fitting portion BD1b, it is not necessary to enlarge the protrusion 32d. This can prevent the pump device 10 from increasing in size.

  Further, for example, a configuration in which the pump cover body 32c is fitted to the fitting portion BD1b to support the pump device 10 is also conceivable. However, since the pump cover 32 is attached to the pump body 31 with the screw 94, the assembly error with respect to the housing 12 is likely to be larger than that of the pump body 31. As a result, there is a possibility that the pump cover body portion 32c cannot be fitted to the fitting portion BD1b with high accuracy.

  On the other hand, according to the present embodiment, the exposed portion 34 of the pump body 31, which has a smaller assembly error with respect to the housing 12 than the pump cover 32, is fitted to the fitting portion BD1b. Easy to fit BD1b with high precision.

  Further, according to the present embodiment, since the pump body 31 has the exposed portion 34, the pump cover 32 can be attached to the exposed portion 34 as in the present embodiment. Thereby, for example, an assembling method in which the pump body 31 is fixed inside the housing 12 and then the pump cover 32 is attached to the exposed portion 34 can be adopted, and the degree of freedom in assembling the pump device 10 can be improved. Further, since only the pump cover 32 can be removed after the pump device 10 is assembled, maintenance of the pump device 10 such as replacement of the inner rotor 61 and the outer rotor 62 in the pump chamber 33 can be facilitated. .

  Further, according to the present embodiment, the exposed portion 34 and the pump chamber 33 overlap in the radial direction. Therefore, the radially outer portions of the inner rotor 61 and the outer rotor 62 housed in the pump chamber 33 can be fitted and supported by the fitting portion BD1b. As a result, it is possible to suppress the vibration caused by the rotation of the inner rotor 61 and the outer rotor 62 from being transmitted to the suction port 32a and the discharge port 32b. Therefore, wear of the O-ring 37 can be further suppressed.

  When the exposed portion 34 and the pump chamber 33 do not overlap in the radial direction, for example, a configuration in which the exposed portion 34 is located on the opposite output side (+ Y side) of the pump chamber 33 is conceivable. With this configuration, the dimension of the portion of the pump body 31 projecting toward the output side (−Y side) of the housing 12 in the axial direction (Y-axis direction) tends to increase. Therefore, the entire pump device 10 tends to be axially large.

  On the other hand, according to the present embodiment, since the exposed portion 34 and the pump chamber 33 overlap each other in the radial direction, the axial direction of the portion of the pump body 31 that projects more toward the output side (−Y side) than the housing 12 ( It is possible to prevent the dimension in the Y-axis direction from increasing. Therefore, according to this embodiment, it is possible to prevent the axial size of the pump device 10 from increasing.

  Further, according to the present embodiment, the pump body 31 has the bearing portion 36 that supports the shaft 41. Therefore, by fitting the pump body 31 with the fitting portion BD1b with high accuracy, the pump device 10 can be attached to the vehicle body CB1 with high axial accuracy of the shaft 41.

  As shown in FIG. 2, in the present embodiment, the exposed portion 34 and the vehicle body CB1 are provided with a positioning portion PA1 that relatively positions the exposed portion 34 and the vehicle body CB1 in the circumferential direction. The positioning portion PA1 includes a pump body side concave portion 34b and a vehicle side convex portion CB1a. That is, the positioning part PA1 is located on the outer peripheral surface 34a of the exposed part 34 and is recessed inward in the radial direction on the pump body side 34b, and on the inner peripheral surface of the fitting part BD1b is protruded inward in the radial direction toward the vehicle. And a portion CB1a.

  When the pump device 10 is attached to the vehicle body CB1, the pump body side concave portion 34b and the vehicle side convex portion CB1a face each other in the radial direction. As a result, according to the present embodiment, the relative circumferential position between the exposed portion 34 and the vehicle body CB1 can be determined. Therefore, the pump device 10 can be easily attached to the vehicle body CB1.

  In the present embodiment, the pump body side concave portion 34b and the vehicle side convex portion CB1a are fitted to each other, for example. Therefore, the relative circumferential position between the exposed portion 34 and the vehicle body CB1 can be determined more accurately.

  In the present specification, the pump body side concave portion located on the outer peripheral surface of the exposed portion and recessed radially inward includes a portion located radially inner than the cylindrical outer peripheral surface of the exposed portion.

  When the motor unit 20 is driven and the shaft 41 rotates, the inner rotor 61 fixed to the shaft 41 rotates. As the inner rotor 61 rotates, the outer rotor 62 rotates. The rotation of the inner rotor 61 and the outer rotor 62 causes oil to flow into the pump chamber 33 from the import portion IP via the suction port 32a. The oil that has flowed into the pump chamber 33 moves in the pump chamber 33 while the inner rotor 61 and the outer rotor 62 rotate, and flows out of the pump device 10 from the outport portion OP via the discharge port 32b. In this way, the pump unit 30 is driven by the motor unit 20, and the pump device 10 sends oil from the import unit IP to the outport unit OP.

  In addition, in the present embodiment, the following configurations may be adopted. In the following description, configurations similar to those described above may be omitted by appropriately assigning the same reference numerals and the like.

  In this embodiment, a plurality of exposed portions 34 may be provided, for example. In this case, the plurality of exposed portions 34 are provided along the circumferential direction. The plurality of exposed portions 34 surround the outside of the central axis J in the radial direction. That is, the radially outer side surfaces of the plurality of exposed portions 34 surround the radially outer side of the central axis J.

  Further, in the present embodiment, the exposed portion 34 and the pump chamber 33 do not have to overlap in the radial direction. In the present embodiment, the exposed portion 34 may be located on the output side (−Y side) or the counter output side (+ Y side) of the pump chamber 33.

  Further, in the present embodiment, the bearing portion 36 may be a rolling bearing. Further, in the present embodiment, the pump body 31 may not have the bearing portion 36.

  Further, in the present embodiment, the fitting between the exposed portion 34 and the fitting portion BD1b is not particularly limited, and may be tight fitting, for example.

  Further, in the present embodiment, the configuration of the positioning portion PA1 is not particularly limited, and may be, for example, the configuration shown in FIGS. 3 and 4.

  FIG. 3 is a sectional view showing a part of a pump device 110 which is another example of the present embodiment. As shown in FIG. 3, the pump device 110 is attached to the vehicle body CB2. The pump device 110 includes a pump unit 130. The pump unit 130 has a pump body 131. The pump body 131 has an exposed portion 134.

  The vehicle body CB2 has a pump device housing portion BD2. The pump device housing portion BD2 has a fitting portion BD2b. The exposed portion 134 is fitted to the fitting portion BD2b.

  A positioning portion PA2 is provided on the exposed portion 134 and the vehicle body CB2. The positioning portion PA2 has a pump body side concave portion 134b and a vehicle side convex portion CB2a. The pump body side recess 134b is located on the outer peripheral surface 134a of the exposed portion 134 and is recessed radially inward. In the example of FIG. 3, the shape of the pump body side recess 134b when viewed in the axial direction is a linear shape in which a part of a circle is cut out. In the example of FIG. 3, the outer shape of the exposed portion 134 when viewed in the axial direction (Y-axis direction) is a shape in which a part of a circle is cut out along a straight line.

  The vehicle-side convex portion CB2a is located on the inner peripheral surface of the fitting portion BD2b and projects radially inward. In the example of FIG. 3, the shape of the vehicle-side convex portion CB2a when viewed in the axial direction (Y-axis direction) is a shape obtained by cutting a part of a circle along a straight line. The shape of the fitting portion BD2b when viewed in the axial direction is a shape obtained by cutting a part of a circle along a straight line.

  Also in the example of FIG. 3, the pump body side concave portion 134b and the vehicle side convex portion CB2a are fitted to face each other in the radial direction. As a result, the positioning portion PA2 determines the relative positions of the exposed portion 134 and the vehicle body CB2 in the circumferential direction. Other configurations of the pump device 110 are similar to those of the pump device 10 shown in FIGS. 1 and 2. Other configurations of the vehicle body CB2 are similar to those of the vehicle body CB1 shown in FIGS. 1 and 2.

  FIG. 4 is a sectional view showing a part of a pump device 210 which is another example of the present embodiment. As shown in FIG. 4, the pump device 210 is attached to the vehicle body CB3. The pump device 210 includes a pump unit 230. The pump unit 230 has a pump body 231. The pump body 231 has an exposed portion 234.

  The vehicle body CB3 has a pump device housing portion BD3. The pump device housing portion BD3 has a fitting portion BD3b. The exposed portion 234 is fitted to the fitting portion BD3b.

  A positioning portion PA3 is provided on the exposed portion 234 and the vehicle body CB3. The positioning portion PA3 has a pump body side convex portion 234b and a vehicle side concave portion CB3a. The pump body side convex portion 234b is located on the outer peripheral surface 234a of the exposed portion 234 and projects radially outward. The shape of the pump body side convex portion 234b when viewed in the axial direction (Y-axis direction) is, for example, a rectangular shape.

  The vehicle-side recess CB3a is located on the inner peripheral surface of the fitting portion BD3b and is recessed radially outward. The shape of the vehicle-side recess CB3a when viewed in the axial direction (Y-axis direction) is, for example, a rectangular shape.

  The pump body side convex portion 234b and the vehicle side concave portion CB3a face each other in the radial direction. In the example of FIG. 4, the pump body side convex portion 234b and the vehicle side concave portion CB3a are fitted together. As a result, the positioning portion PA3 determines the relative positions of the exposed portion 234 and the vehicle body CB3 in the circumferential direction. Other configurations of the pump device 210 are similar to those of the pump device 10 shown in FIGS. 1 and 2. Other configurations of the vehicle body CB3 are similar to those of the vehicle body CB1 shown in FIGS. 1 and 2.

<Second Embodiment>
The second embodiment differs from the first embodiment in that a flow path for oil is provided between the exposed portion and the fitting portion in the radial direction. In addition, about the same structure as the said embodiment, the description may be abbreviate | omitted by giving the same code | symbol suitably.

  FIG. 5 is a cross-sectional view showing a portion of the pump device 310 of this embodiment. FIG. 6 is a view showing the pump body 331 and is a sectional view taken along line VI-VI in FIG. As shown in FIG. 5, the pump device 310 is attached to the vehicle body CB4. The pump device 310 includes a case 11, a motor unit 20, and a pump unit 330.

  The pump section 330 includes a pump body 331, a pump cover 32, an inner rotor 61, and an outer rotor 62. The pump body 331 has an exposed portion 334. The vehicle body CB4 has a pump device housing portion BD4. The pump device housing portion BD4 has a housing body portion BD4a and a fitting portion BD4b. The exposed portion 334 is fitted to the fitting portion BD4b. The accommodation body portion BD4a is similar to the accommodation body portion BD1a of the first embodiment.

  As shown in FIG. 6, a flow path FC1 through which oil passes is provided between the exposed portion 334 and the fitting portion BD4b in the radial direction. As shown in FIG. 5, the flow path FC1 is connected to the suction port 32a. Therefore, the oil that flows into the suction port 32a from the import unit IP flows into the storage body BD4a through the flow path FC1. More specifically, oil flows in between the housing body portion BD4a and the housing 12 in the radial direction. As a result, the portion of the pump device 310 located inside the housing body BD4a can be cooled by the oil. The portion of the pump device 310 located inside the housing body portion BD4a includes, for example, the rotor 40 and the stator 50 in the present embodiment.

  Similar to the pump device 110 shown in FIG. 1, when the pump device 310 is attached to the vehicle body CB4, an O-ring 93 is provided between the housing flange portion 15 and the vehicle surface CBS. Therefore, it is possible to prevent the oil that has flowed into the housing body portion BD4a from leaking to the outside from between the housing flange portion 15 and the vehicle surface CBS.

  As shown in FIG. 6, in the present embodiment, a channel FC2 through which oil passes is provided between the exposed portion 334 and the fitting portion BD4b in the radial direction, in addition to the channel FC1. That is, in this embodiment, two flow paths FC1 and FC2 are provided between the exposed portion 334 and the fitting portion BD4b in the radial direction. Therefore, for example, the oil that has flowed into the storage body BD4a via the flow path FC1 flows out from the storage body BD4a via the flow path FC2. As a result, the oil that flows into the storage body BD4a can be circulated. Therefore, the pump device 310 can be cooled more easily.

  In the example of FIG. 6, the flow path FC1 is located at the lower (−Z side) end of the radial portion between the exposed portion 334 and the fitting portion BD4b. The flow path FC2 is located at the upper (+ Z side) end of the radial portion between the exposed portion 334 and the fitting portion BD4b. That is, in the present embodiment, the two flow paths FC1 and FC2 are located on the opposite sides with respect to the central axis J.

  Therefore, it is easy to cool the entire circumferential direction of the pump device 310 until the oil that has flowed into the storage body BD4a via the flow path FC1 flows out from the storage body BD4a via the flow path FC2. Specifically, in the example of FIGS. 5 and 6, oil flows from the import unit IP into the storage body BD4a via the flow path FC1. Then, the oil that has flowed into the housing body portion BD4a flows upward (+ Z side) along the outer peripheral surface of the housing 12 and flows out from the housing body portion BD4a through the flow path FC2. In this way, according to the present embodiment, the entire oil in the circumferential direction of the pump device 310 can be easily cooled by the oil that flows into the housing body portion BD4a.

  As shown in FIG. 6, the outer peripheral surface 334a, which is the radially outer surface of the exposed portion 334, is provided with exposed portion side grooves 334b and 334c that are recessed radially inward. As shown in FIG. 5, the exposed portion side grooves 334b and 334c extend in the axial direction (Y-axis direction). The shapes of the exposed portion side grooves 334b and 334c are, for example, the same as the shape of the pump body side concave portion 34b shown in FIG.

  As shown in FIG. 6, the exposed portion side groove 334b is located, for example, at the lower end (−Z side) of the outer peripheral surface 334a. The exposed portion side groove 334c is located, for example, at the upper (+ Z side) end of the outer peripheral surface 334a.

  Fitting portion side grooves CB4a and CB4b that are recessed radially outward are provided on the radially inner surface of the fitting portion BD4b. As shown in FIG. 5, the fitting portion side grooves CB4a and CB4b extend in the axial direction (Y-axis direction). The shapes of the fitting portion side grooves CB4a and CB4b are the same as the shape of the vehicle side recess CB3a shown in FIG. 4, for example.

  The fitting portion side groove CB4a is located, for example, at the lower end (−Z side) of the radially inner surface of the fitting portion BD4b. The fitting portion side groove CB4b is located, for example, at the upper (+ Z side) end of the radially inner surface of the fitting portion BD4b.

  The exposed portion side groove 334b and the fitting portion side groove CB4a face each other in the radial direction. As a result, the exposed portion side groove 334b and the fitting portion side groove CB4a form the flow path FC1. That is, the exposed portion side groove 334b constitutes at least a part of the flow path FC1. The fitting portion side groove CB4a constitutes at least a part of the flow path FC1.

  The exposed portion side groove 334c and the fitting portion side groove CB4b face each other in the radial direction. As a result, the exposed portion side groove 334c and the fitting portion side groove CB4b form the flow path FC2. That is, the exposed portion side groove 334c constitutes at least a part of the flow path FC2. The fitting portion side groove CB4b constitutes at least a part of the flow path FC2.

  According to the present embodiment, grooves are provided in both the exposed portion 334 and the fitting portion BD4b, and the grooves face each other in the radial direction to form the flow paths FC1 and FC2. Therefore, it is easy to increase the cross-sectional area of the flow paths FC1 and FC2. This makes it easier for oil to pass through the flow paths FC1 and FC2.

  In the present embodiment, the width of the fitting portion side grooves CB4a, CB4b in the X axis direction is larger than the width of the exposed portion side grooves 334b, 334c in the X axis direction, for example. The other configurations of the pump device 310 are the same as the configurations of the pump device 10 of the first embodiment. The other configurations of the vehicle body CB4 are the same as the configurations of the vehicle body CB1 of the first embodiment.

  Note that the following configuration may be adopted in this embodiment.

  In the present embodiment, the number of flow paths FC1 and FC2 may be one, or may be three or more. Further, the shapes of the flow paths FC1 and FC2 in the present embodiment are not particularly limited.

  Further, in the present embodiment, the flow paths FC1 and FC2 may be configured by only one of the exposed portion side grooves 334b and 334c and the fitting portion side grooves CB4a and CB4b. In this case, the other of the exposed portion side grooves 334b and 334c and the fitting portion side grooves CB4a and CB4b may not be provided.

  The mounting method of the pump device according to the above embodiment to the vehicle body is not limited to the mounting method described above. The pump device of the above-described embodiment can be used by being attached to the vehicle body, for example, in a state where the exposed portion is not fitted to the fitting portion of the vehicle body.

  In addition, the configurations of the first embodiment and the second embodiment described above can be appropriately combined as long as they do not conflict with each other.

  10, 110, 210, 310 ... Pump device, 12 ... Housing, 14 ... Housing tubular portion (cylindrical portion), 15 ... Housing flange portion (flange portion), 16 ... Extension portion, 20 ... Motor portion, 30, 130, 230 , 330 ... Pump section, 31, 131, 231, 331 ... Pump body, 31a ... Through hole, 32 ... Pump cover, 32a ... Suction port, 32b ... Discharge port, 33 ... Pump chamber, 34, 134, 234, 334 ... Exposed portion, 34a, 134a, 234a, 334a ... Outer peripheral surface (outer surface), 34b, 134b ... Pump body side recessed portion, 35 ... Step portion, 35a ... Step surface, 36 ... Bearing portion, 40 ... Rotor, 41 ... Shaft, 50 ... Stator, 61 ... Inner rotor, 62 ... Outer rotor, 234b ... Pump body side convex part, 334b, 334c ... Exposed part side groove, BD1, D2, BD3, BD4 ... Pump device housing portion, BD1b, BD2b, BD3b, BD4b ... Fitting portion, CB1, CB2, CB3, CB4 ... Vehicle body, CB1a, CB2a ... Vehicle side convex portion, CB3a ... Vehicle side concave portion, CB4a , CB4b ... Fitting part side groove, FC1, FC2 ... Flow path, IP ... Import part, J ... Central axis, OP ... Outport part, PA1, PA2, PA3 ... Positioning part

Claims (11)

A motor unit having a shaft centered on a central axis extending in the axial direction, a rotor fixed to the shaft, and a stator positioned radially outside the rotor;
A pump portion located on one axial side of the motor portion and driven by the motor portion;
A tubular housing that holds the motor unit and the pump unit,
The pump unit includes an inner rotor attached to the shaft,
An annular outer rotor surrounding the radially outer side of the inner rotor,
A pump body that houses the inner rotor and the outer rotor;
A pump cover attached to one side in the axial direction of the pump body,
Have
The pump body is recessed from the surface on one side in the axial direction to the other side in the axial direction, and a pump chamber that accommodates the inner rotor and the outer rotor, and a through hole that axially penetrates the pump body and through which the shaft passes. And have,
The pump cover has an intake port and a discharge port that communicate with the pump chamber,
The housing has a tubular portion that covers at least a radial outer side of the stator, and a flange portion that extends radially outward from an end portion of the tubular portion on the other axial side,
The pump body has an exposed portion that is located on one axial side of the tubular portion and is exposed to the outside of the housing.
The said exposure part is a pump apparatus which is supported by the pump apparatus accommodating part by the side of a vehicle main body, and has an outer side surface which surrounds the radial direction outer side of the said central axis. The pump device according to claim 1, wherein the pump cover is attached to the pump body with a screw.   The pump body has a step portion whose radial dimension decreases toward one side in the axial direction,
  The housing has an extending portion that extends radially inward from an end portion of the tubular portion on one axial side,
  The pump device according to claim 1, wherein a step surface that intersects the axial direction of the step portion contacts the extending portion.   The pump device according to any one of claims 1 to 3, wherein the pump body has a bearing portion that supports the shaft.   The pump device is fixed to the vehicle body via the flange portion,
  The vehicle body has a pump device housing part for housing the pump device, an import part connected to the suction port, and an outport part connected to the discharge port,
  The pump device according to any one of claims 1 to 4, wherein the pump device housing portion has a fitting portion that is fitted to the exposed portion.   A flow path through which a fluid passes is provided between the exposed portion and the fitting portion in a radial direction,
  The pump device according to claim 5, wherein the flow path is connected to the suction port.   The two flow paths are provided between the exposed portion and the fitting portion in the radial direction,
  The pump device according to claim 6, wherein the two flow paths are located on opposite sides of each other with respect to the central axis.   An exposed portion side groove that is recessed inward in the radial direction is provided on the radially outer surface of the exposed portion,
  The pump device according to claim 6 or 7, wherein the exposed portion side groove constitutes at least a part of the flow path.   On the radially inner surface of the fitting portion, a fitting portion side groove that is recessed radially outward is provided,
  The pump device according to claim 6, wherein the fitting portion side groove constitutes at least a part of the flow path.   The exposed portion has a cylindrical shape,
  The inner surface in the radial direction of the pump device accommodating portion has a cylindrical shape,
  The exposed portion and the vehicle body are provided with a positioning portion that performs relative positioning in the circumferential direction of the exposed portion and the vehicle body,
  The positioning portion includes a pump body side concave portion located on the outer peripheral surface of the exposed portion and recessed radially inward, and a vehicle side convex portion located on the inner peripheral surface of the fitting portion and protruding radially inward. Have,
  The pump device according to any one of claims 5 to 9, wherein the pump body side concave portion and the vehicle side convex portion face each other in the radial direction.   The exposed portion has a cylindrical shape,
  The inner surface in the radial direction of the pump device accommodating portion has a cylindrical shape,
  The exposed portion and the vehicle body are provided with a positioning portion that performs relative positioning in the circumferential direction of the exposed portion and the vehicle body,
  The positioning portion includes a pump body side convex portion located on an outer peripheral surface of the exposed portion and protruding radially outward, and a vehicle side concave portion located on an inner peripheral surface of the fitting portion and recessed radially outward. Have,
  The pump device according to claim 5, wherein the pump body-side convex portion and the vehicle-side concave portion face each other in a radial direction.

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