Integrated pump device

Abstract

In an integrated pump device (10), a motor unit (20), a pump unit (30), a hydraulic actuator unit (60), and a substrate (26) are integrally configured. In the motor unit (20), a motor rotor (23) rotates, and a driving force is outputted by a motor output shaft (24) connected to the motor rotor (23). The pump unit (30) is rotated by the driving force of the motor output shaft (24), thereby generating hydraulic pressure. In the hydraulic actuator unit (60), a vane rotor (63) having a vane is rotated inside a vane housing (61) by hydraulic pressure supplied from the pump unit (30). The substrate (26) is disposed between the motor rotor (23) and the vane rotor (63) in the axial direction. The substrate (26) is provided with: a motor rotation sensor (27) on a surface on the motor rotor (23) side; and a vane position sensor (28) on a surface on the vane rotor (63) side.

Description

Integrated Pumping Unit CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on Japanese Application No. 2024-043139, filed on March 19, 2024, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates to an integrated pumping device.

[0003] Conventionally, there are known devices in which the driving force of a motor is transmitted to a parking lock mechanism. For example, in the device disclosed in Patent Document 1, an electric pump is fixed to a case of an actuator of the transmission mechanism and includes a motor and a pump that transfers oil. The pump is located on the opposite side of the motor from the actuator. The actuator of the transmission mechanism includes a driving gear, an idler gear, and an output gear.

[0004] When the electric pump is driven, the driving gear connected to the motor shaft rotates. When the solenoid of the transmission mechanism is activated, the idler gear engages and the rotation of the driving gear is transmitted to the output shaft via the output gear. The rotation of the output shaft activates the parking lock mechanism.

[0005] Patent Document 2 discloses an integrated pump device that integrates a motor, an oil pump, and a hydraulic parking lock actuator. For example, the hydraulic parking lock actuator is configured as a rotary hydraulic actuator in which a vane rotor rotates within a vane housing.

[0006] Japanese Patent No. 7281635 Japanese Patent Application Laid-Open No. 2023-093012

[0007] In the device disclosed in Patent Document 1, the driving force of the motor of the electric pump is simply transmitted to the parking lock mechanism, and the actuator is not actuated by the hydraulic pressure of the pump. Furthermore, there is no description of detecting the operation of the actuator.

[0008] In the integrated pump device of Patent Document 2, a rotary hydraulic actuator is driven by hydraulic pressure generated by an oil pump connected to the motor output shaft. This integrated pump device requires a compact size. Furthermore, the rotation of the motor and the operating position of the hydraulic actuator must be detected by separate sensors, and the layout of the circuit board on which the two types of sensors are mounted presents a challenge.

[0009] An object of the present disclosure is to provide an integrated pump device that is compact in size, in which the rotation of a motor and the operating position of a hydraulic actuator are detected separately.

[0010] The integrated pump device of the present disclosure is an integrated unit including a motor unit, a pump unit, a hydraulic actuator unit, and a substrate. The motor unit rotates a motor rotor housed in a motor housing, and outputs driving force through a motor output shaft connected to the motor rotor. The pump unit generates hydraulic pressure by rotating a pump rotor housed in a pump housing with the driving force of the motor output shaft.

[0011] The hydraulic actuator unit has a vane rotor with one or more vanes that rotates within a vane housing using hydraulic pressure supplied from a pump unit, and the operating direction of the vane rotor changes depending on the rotation direction of the pump unit. If the direction of the motor output shaft is the axial direction, the circuit board is located between the motor rotor and the vane rotor in the axial direction, and has multiple electronic elements mounted on it.

[0012] The vane rotor is arranged coaxially with the motor output shaft on the opposite side of the pump section from the motor section, or arranged parallel to the motor output shaft on the same side of the motor section as the pump section.

[0013] The substrate is provided with a motor rotation sensor on its motor surface, which is the surface facing the motor rotor, to detect the rotation of the motor rotor, and a vane position sensor on its vane surface, which is the surface facing the vane rotor, to detect the operating position of the vane rotor.

[0014] In the integrated pump device of the present disclosure, two types of sensors are provided on both sides of a substrate arranged between the motor rotor and the vane rotor in the axial direction, thereby making it possible to reduce the size of the integrated pump device.

[0015] The above and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which Fig. 1 is an assembly diagram of an integrated pump device according to one embodiment, Fig. 2 is an exploded diagram of the integrated pump device according to one embodiment, Fig. 3 is a configuration diagram of the integrated pump device and a parking lock mechanism, Fig. 4 is a schematic axial cross-sectional view of the integrated pump device according to one embodiment, Fig. 5 is a view taken along line V-V in Fig. 4 as seen from the motor unit side, Fig. 6 is a view taken along line VI-VI in Fig. 4 as seen from the hydraulic actuator unit side, Fig. 7 is a view of the pump housing as seen from the direction of Fig. 5, and Fig. 8 is a view of the pump housing as seen from the direction of Fig. 6. FIG. 10 is a diagram showing the arrangement of vane position sensors on the vane surface of the base plate; FIG. 11 is a schematic diagram of a ring magnet; FIG. 12 is a diagram explaining the operation of the vane rotor in the hydraulic actuator section; FIG. 13 is an exploded schematic diagram of an integrated pump device of another embodiment; FIG. 14 is an exploded schematic diagram of an integrated pump device of another embodiment; and FIG. 15 is a diagram showing the motor surface of the base plate of another embodiment.

[0016] An integrated pump device according to one embodiment will be described with reference to the drawings. The integrated pump device is configured to integrate a motor unit, a pump unit, a hydraulic actuator unit, and a substrate. The integrated pump device of this embodiment is primarily installed in electric vehicles such as electric vehicles and hybrid vehicles, and has both a PLA (parking lock actuator) function and an EOP (electric oil pump) function. The PLA function switches the parking lock mechanism between a locked state and an unlocked state. The EOP function supplies oil for cooling or lubrication to an oil consumer such as an MG (motor generator).

[0017] More specifically, the integrated pump device of this embodiment is mounted on, for example, an autonomous electric vehicle. When a command to start or park the vehicle is received from the vehicle's host control device, the integrated pump device activates the parking lock mechanism. The integrated pump device also adjusts the amount of oil supplied to the MG based on the MG speed, load, and other factors while the vehicle is running with the parking lock mechanism unlocked.

[0018] First, a general configuration will be described with reference to FIGS. 1 and 2, which are schematic assembly and disassembly diagrams of an integrated pump device 10 according to one embodiment. The integrated pump device 10 is primarily comprised of a motor unit 20, a pump unit 30, a hydraulic actuator unit 60, and a base plate 26. Hereinafter, the direction of the motor output shaft 24 will be referred to as the "axial direction." FIG. 1 schematically shows an axial cross section of one embodiment. In this embodiment, the rotation axis O of the motor rotor 23 and the motor output shaft 24 and the rotation axis Q of the vane rotor 63 are coaxially arranged along the axial direction. Furthermore, a plane perpendicular to the axial direction will be referred to as the "axially orthogonal plane." For example, the base plate 26 is arranged along the axially orthogonal plane.

[0019] In Figure 2, in principle, fixed components such as the housing are excluded from Figure 1, and only internal rotating components and components related to position detection of the rotating components are shown in solid lines. However, the pump housing 31 is shown in two-dot chain line for reference of positional relationships. Figures 13 and 14, which show the configurations of other embodiments, follow the format of Figure 2.

[0020] The motor unit 20 includes a stator 22 and a motor rotor 23, which constitute, for example, a three-phase brushless motor, housed in a motor housing 21. The rotor 23 of the motor unit 20 is referred to as the "motor rotor" to distinguish it from the vane rotor 63. When a rotating magnetic field is generated by energizing the motor windings wound around the stator 22, the motor rotor 23, which has magnetic poles, rotates radially inside the stator 22. The motor unit 20 outputs a driving force via a motor output shaft 24 connected to the center of the motor rotor 23. A ring magnet 25, which is used for detection by a motor rotation sensor 27, is attached to the motor rotor 23. The magnetic field φm of the ring magnet 25 is transmitted to the motor rotation sensor 27 as indicated by the dashed arrow.

[0021] The pump section 30 generates hydraulic pressure when a pump gear 32 serving as a "pump rotor" housed in a "pump housing" rotates due to the driving force of the motor output shaft 24. In one embodiment, a pump plate 50 covering the end face of the pump housing 31 on the hydraulic actuator section 60 side can be considered part of the "pump housing." In other words, the pump housing 31 in the narrow sense and the pump plate 50 together constitute a "pump housing" in the broad sense, which is the housing of the pump section 30. The pump housing 31 houses the pump gear 32, which rotates due to the driving force of the motor output shaft 24. In this specification, the rotation of the pump gear 32 is also referred to as "the pump section 30 rotating."

[0022] The hydraulic actuator unit 60 has a vane rotor 63, which has one or more vanes, housed in a vane housing 61. The vane rotor 63 rotates within the vane housing 61 by hydraulic pressure supplied from the pump unit 30. The operating direction of the vane rotor 63 switches depending on the rotation direction of the pump unit 30. A vane magnet 649, which is used for detection by the vane position sensor 28, is attached to one of the vanes of the vane rotor 63.

[0023] In addition, a yoke 49 that transmits the magnetic field φv of the vane magnet 649 to the vane position sensor 28 is provided across the pump housing 31 and the pump plate 50. The reference numeral "49" for the yoke in Figures 1 and 2 collectively refers to two yokes 491 and 492 shown in Figure 6.

[0024] The base plate 26 is disposed axially between the motor rotor 23 and the vane rotor 63. In one embodiment, the vane rotor 63 is disposed coaxially with the motor output shaft 24 on the opposite side of the pump section 30 from the motor section 20. In other words, the rotation axis O of the motor output shaft 24 and the rotation axis Q of the vane rotor 63 are aligned on a straight line.

[0025] The surface of the substrate 26 facing the motor rotor 23 is referred to as the "motor surface 261," and the surface facing the vane rotor 63 is referred to as the "vane surface 262." A motor rotation sensor 27 that detects the rotation of the motor rotor 23 is provided on the motor surface 261 of the substrate 26. A vane position sensor 28 that detects the operating position of the vane rotor 63 is provided on the vane surface 262 of the substrate 26.

[0026] In this integrated pump device 10, a motor rotation sensor 27 is provided on a motor surface 261 on the motor rotor 23 side of a base plate 26, and a vane position sensor 28 is provided on a vane surface 262 on the vane rotor 63 side. By providing two types of sensors 27, 28 on both sides of the base plate 26, the size of the integrated pump device 10 can be reduced.

[0027] The integrated pump device 10 also includes positioning members 191-193 that position the pump housing 31 relative to the board 26, motor housing 21, and vane housing 61. Positioning pins, for example, are used as the positioning members 191-193. The positioning member 191 positions the pump housing 31 relative to the board 26. The positioning member 192 penetrates the pump plate 50 and positions the pump housing 31 relative to the motor housing 21. The positioning member 193 positions the pump housing 31 relative to the vane housing 61. This increases the positional accuracy between the components and improves the accuracy of detecting the operating position of the vane rotor 63. As a result, the discharge flow rate of the pump section 30 and the torque output performance of the hydraulic actuator section 60 are improved.

[0028] A connector 39 for inputting power and signals from the outside is provided on the side surface of the pump housing 31. It is preferable that a positioning member 194 for positioning the pump housing 31 and the connector 39 be further provided.

[0029] Here, explanations of some of the symbols and characters shown in Fig. 1 that have not already been mentioned will be omitted. In the following explanation, the items shown in Fig. 1 will be referred to as needed.

[0030] Next, the relationship between the operation of the vane rotor 63 and the operation of the parking lock mechanism 80 will be described with reference to Fig. 3. Fig. 3 shows an example of a system configuration. The parking lock mechanism 80 includes a detent mechanism including a detent shaft 81, a detent plate 82, a detent spring 83, and a detent roller 84, as well as a parking rod 85, a cone 86, a parking lock pole 87, a parking gear 88, etc.

[0031] The detent mechanism switches between a P position and a not-P position according to the output of the hydraulic actuator unit 60. The detent shaft 81 is connected to the rotary shaft of the vane rotor 63 of the hydraulic actuator unit 60 and rotates in both directions within a predetermined angular range by the operation of the vane rotor 63. The detent plate 82 is fixed to the detent shaft 81 and rotates together with the detent shaft 81. For example, in a two-position detent mechanism, the detent plate 82 has two valleys 821, 822 and a peak 825 on its radially outer edge. In other configurations, a detent mechanism with three or more positions may be used.

[0032] The detent roller 84, supported on the tip of the detent spring 83, fits into one of the two valleys 821, 822 due to the elastic force of the detent spring 83. When a rotational force greater than a predetermined value is applied to the detent plate 82, the detent spring 83 elastically deforms, and the detent roller 84 moves from one valley to the other, overcoming the peak 825. This switches between the P position and the not P position.

[0033] The parking rod 85 is formed in a generally L-shape, and one end 851 is fixed to the detent plate 82. A cone 86 is provided on the other end 852 of the parking rod 85, the diameter of which decreases as it approaches the other end 852. When the detent plate 82 rotates in a direction in which the detent roller 84 fits into the valley portion 821, the cone 86 moves in the direction of arrow P. When the detent plate 82 rotates in a direction in which the detent roller 84 fits into the valley portion 822, the cone 86 moves in the direction of arrow notP.

[0034] The parking lock pole 87 abuts against the conical surface of the cone 86 and is capable of swinging around a shaft 877. The parking lock pole 87 is provided with a protrusion 878 that can mesh with a parking gear 88. When the cone 86 moves in the direction of arrow P, the parking lock pole 87 is pushed up, and the protrusion 878 meshes with the parking gear 88, thereby establishing a locked state. When the cone 86 moves in the direction of arrow not P, the protrusion 878 separates from the parking gear 88, and the locked state is released.

[0035] In this way, the integrated pump device 10 realizes the PLA function by operating the hydraulic actuator unit 60 with the hydraulic pressure supplied by the pump unit 30. Also, the integrated pump device 10 supplies oil for cooling or lubrication to an oil consumer such as the MG97 through the EOP function in which the pump unit 30 rotates and discharges oil drawn in from the suction port 67 from the discharge port 68.

[0036] Next, the detailed configuration of the integrated pump device 10 according to one embodiment will be described in order with reference to Figures 4 to 12. First, with reference to the schematic cross-sectional view of Figure 4, the overall configuration of the integrated pump device 10, which is not shown in Figure 1, will be supplemented. As with Figure 1, some of the symbols and characters shown in Figure 4 will be referenced in the following description.

[0037] The pump gear 32 is composed of an inner gear 321 and an outer gear 322, and is housed in a pump chamber 33 of the pump housing 31. The end of the motor output shaft 24 on the motor housing 21 side is supported by a bearing 215. The motor output shaft 24 passes through a hole 263 in the base plate 26, and the end on the opposite side from the motor section 20 is connected to the inner gear 321 of the pump gear 32. An oil seal 246 is provided in the middle of the motor output shaft 24 to seal off oil that leaks from the pump chamber 33 along the outer circumferential surface toward the motor section 20 side.

[0038] A cylindrical protrusion 37 is provided in the center of the pump housing 31 on the side facing the motor unit 20, coaxial with the rotation axis O. The substrate 26 is placed on a substrate seat 36 recessed around the protrusion 37. The pump housing 31 also has a valve hole 34 formed therein that houses a spool valve 40 that switches the intake oil passage to the pump chamber 33.

[0039] The vane housing 61 is formed with an inlet port 67 and an outlet port 68. The inlet port 67 communicates with the valve hole 34 of the pump housing 31. The outlet port 68 communicates with a chamber bottom discharge opening 625 (see FIG. 12) formed in the bottom of the first vane chamber 621 of the vane housing 61. As the vane rotor 63 operates, the opening area of ​​the chamber bottom discharge opening 625 changes.

[0040] Further, please refer to Figures 5 to 10. Figures 5 and 6 are cross-sectional views of the assembled state as seen from the motor section 20 side and the hydraulic actuator section 60 side of the pump housing 31, respectively. Figures 7 and 8 are views of the pump housing 31 alone as seen from the directions of Figures 5 and 6, respectively. Figures 9 and 10 are views of the motor surface 261 and the vane surface 262 of the circuit board 26, respectively, and electronic elements other than the sensors 27 and 28 mounted on the circuit board 26 are not shown.

[0041] 9 and 10, the substrate 26 has a hole 263 through which the motor output shaft 24 passes. As shown in FIGS. 1 and 4, the pump unit 30 is connected to the motor output shaft 24, which passes through the hole 263 in the substrate 26, on the opposite side of the substrate 26 from the motor unit 20. This allows the size of the integrated pump device 10 to be reduced in the plane perpendicular to the axis.

[0042] As shown in Figure 5, a substrate 26 on which a plurality of electronic elements such as a capacitor 266, an inductor 267, and a MOSFET 268 are mounted is installed on the side of the pump housing 31 facing the motor section 20. The electronic elements 266, 267, and 268 form a control circuit that drives the motor section 20. The substrate 26 is accommodated in an internal space 360 ​​of the pump housing 31 shown in Figure 7. In front of the substrate 26 in Figure 5, a ring magnet 25 (see Figure 11) used for detection by the motor rotation sensor 27 is attached to the motor rotor 23.

[0043] 6, the pump gear 32 housed in the pump chamber 33 and the spool valve 40 housed in the valve hole 34 are provided on the side of the pump housing 31 facing the hydraulic actuator unit 60. In addition, two yokes 491, 492 made of a soft magnetic material such as iron are provided across the pump housing 31 and the pump plate 50.

[0044] 1, 4, and 5, the dimensional relationship between the ring magnet 25 and the protrusion 37 of the pump housing 31 will be described. The motor output shaft 24 is supported by the motor housing 21 and the protrusion 37 of the pump housing 31. The protrusion 37 is formed coaxially with the motor output shaft 24. Here, "the motor output shaft 24 is supported by the housings 21, 31" means that the motor output shaft 24 is directly fitted into a hole formed in the housings 21, 31, or is supported by a bearing member inserted into the housings 21, 31.

[0045] The inner diameter of ring magnet 25 is represented by Dmi, and the outer diameter of protrusion 37 is represented by Dph. Ring magnet 25 and protrusion 37 are arranged on the same axis-orthogonal plane to satisfy the condition "Dmi > Dph." This allows ring magnet 25 to be efficiently arranged around protrusion 37, thereby reducing the axial length of integrated pump device 10.

[0046] The arrangement of the ring magnet 25 and large elements will be described with reference to Figures 4 and 5. Of the electronic elements 266, 267, and 268 mounted on the substrate 26, elements with heights exceeding the height threshold Hth are defined as "large elements." Elements with cross-hatching in the figures are large elements. The height threshold Hth is the sum of the height Hm of the ring magnet 25 and the axial clearance δm from the motor face 261 of the substrate 26 to the ring magnet 25.

[0047] Half the outer diameter of ring magnet 25 (i.e., the outer radius) is represented as Rmo, and the shortest distance from center O of ring magnet 25 to the outer surface of the large element is represented as Rk. In the example of Figure 5, the distance to the outer surface of the middle capacitor 266 of the three capacitors arranged on ring magnet 25 corresponds to the shortest distance Rk from center O.

[0048] The large elements are arranged on the motor surface 261 of the substrate 26 so as to satisfy the condition "Rmo≦Rk", or the large elements are arranged on the vane surface 262 of the substrate 26 as shown in Figure 4. This improves the component integration rate of the electronic elements 266, 267, 268 mounted on the substrate 26, and reduces the axial length of the integrated pump device 10.

[0049] 1, 5, 9, and 10. The substrate 26 has a plurality of motor terminal wire connection holes 265 to which motor terminal wires 225 connected to the motor windings of the motor section 20 (stator 22) are connected. A conductive pattern is formed around the motor terminal wire connection holes 265. The motor terminal wires 225 extend parallel to one another in the axial direction from the motor windings wound around the stator 22. When the end faces of the motor housing 21 and the pump housing 31 are aligned during assembly, the plurality of motor terminal wires 225 are inserted into the corresponding motor terminal wire connection holes 265.

[0050] As shown in Figures 1, 5, and 6, the pump housing 31 is formed with a wiring window 385 for connecting the motor terminal wires 225 in an area that includes the multiple motor terminal wire connection holes 265 when projected in the axial direction. An operator can connect the motor terminal wires 225 to the motor terminal wire connection holes 265 by soldering them through the wiring window 385. Because the motor terminal wires 225 extend in the axial direction, a sufficient distance can be secured between the motor windings and the soldered connections, enhancing the cooling effect of the motor terminal wires 225. This reduces thermal stress on the circuit board 26 and the sensors 27 and 28.

[0051] Next, the hydraulic drive configuration of the pump unit 30 will be described with reference to Figure 6. In the pump unit 30, rotation of the motor output shaft 24 causes the internal gear 321 to rotate inside the external gear 322, thereby pressure-feeding the oil in the pump chamber 33. When viewed from the direction of view in Figure 6, clockwise rotation (CW rotation) of the pump gear 32 is considered to be forward rotation, and counterclockwise rotation (CCW rotation) is considered to be reverse rotation. Depending on the rotation direction of the pump gear 32 (hereinafter also referred to as the "rotation direction of the pump unit 30"), a positive pressure region higher than the average oil pressure in the pump chamber 33 is alternated with a negative pressure region lower than the average oil pressure. The oil passage in the negative pressure region serves as the intake oil passage, and the oil passage in the positive pressure region serves as the discharge oil passage.

[0052] The pump section 30 has a spool valve 40 disposed on one side (the lower side in FIG. 6 ) of the pump chamber 33, which switches the intake oil path to the pump chamber 33. The spool valve 40 is housed in a valve hole 34 formed in the pump housing 31, and is actuated by the operating pressure of the pump section 30 in accordance with the rotation direction of the pump section 30. A spring 45 is provided at one end of the spool valve 40 to bias the spool valve 40 in one direction.

[0053] The pump housing 31 is formed with a first outport 341, an inport 340, and a second outport 342, in this order, along the valve hole 34. The inport 340 is connected to an oil tank located upstream of the oil passage via a suction port 67 (see FIG. 4 ). During forward rotation of the pump unit 30, the spool valve 40 operates to the left in the figure, connecting the inport 340 to the first outport 341, and the first outport 341 serves as the forward rotation intake oil passage. During reverse rotation of the pump unit 30, the spool valve 40 operates to the right in the figure, connecting the inport 340 to the second outport 342, and the second outport 342 serves as the forward rotation intake oil passage. In this way, the spool valve 40 switches the intake oil passage to the pump chamber 33.

[0054] Oil passages 331 and 332 from the pump chamber 33 to the hydraulic actuator unit 60 are arranged on the opposite side of the pump chamber 33 from the spool valve 40 (upper side in FIG. 6). The first oil passage 331 is a discharge oil passage during reverse rotation, and the second oil passage 332 is a discharge oil passage during forward rotation. Oil pumped by the pump chamber 33 is supplied to the vane chambers 621-624 (see FIG. 12) of the hydraulic actuator unit 60 via the second oil passage 332 or the first oil passage 331, and operates the vane rotor 63. The operation of the vane rotor 63 will be described later with reference to FIG. 12.

[0055] With this configuration, by passing hydraulic oil through the pump housing 31, the yokes 491, 492 provided on the pump housing 31 and the pump plate 50 can be cooled, reducing the temperature difference between the yokes 491, 492 and the vane magnet 649, thereby improving detection accuracy. In addition, because the pump gear 32 and spool valve 40, which are hydraulically driven parts other than the vane rotor 63, are housed in the common pump housing 31, the axial dimension can be reduced.

[0056] Next, the cooling configuration of the circuit board 26 will be described with reference to Figures 7 and 8. The pump housing 31 is formed with an outside air introduction hole 386 that connects the inlet on the hydraulic actuator unit 60 side (Figure 8) with the outlet on the motor unit 20 side (Figure 7). Outside air is introduced through the outside air introduction hole 386 into the internal space 360 ​​in which the circuit board 26 is housed. The positions of the inlet and outlet of the outside air introduction hole 386 are offset by a distance Δx in the direction perpendicular to the axis. In other words, the outside air introduction hole 386 is machined at an angle to the direction perpendicular to the axis, or machined in a crank shape.

[0057] Therefore, outside air is introduced from an inlet near a corner of pump housing 31 toward an outlet that opens into internal space 360. This allows board 26 to be cooled by the outside air, suppressing a temperature rise in sensors 27, 28 due to heat generated by MOSFET 268 and the like when the motor is running. This reduces the temperature difference between sensors 27, 28 and ring magnet 25 and vane magnet 649, thereby improving detection accuracy.

[0058] Next, the detection configuration using the motor rotation sensor 27 and the vane position sensor 28 will be described mainly with reference to Figures 9 to 12. Figures 9 and 10 show the arrangement of the motor rotation sensor 27 and the vane position sensor 28 on the motor surface 261 and the vane surface 262 of the substrate 26.

[0059] 9, motor rotation sensor 27 is composed of three magnetic elements 271, 272, and 273 arranged at predetermined intervals in the circumferential direction, and is arranged directly behind ring magnet 25 as viewed in Fig. 9. In Fig. 5, motor rotation sensor 27 is hidden behind ring magnet 25.

[0060] 11 , ring magnet 25 has a plurality of, for example, eight poles (four pole pairs) of alternating north and south poles arranged circumferentially, and is attached to motor rotor 23. Magnetic elements 271, 272, 273 of motor rotation sensor 27 detect magnetic changes in ring magnet 25, which rotates integrally with motor rotor 23, and output a Hi / Lo sensor signal, for example. A control circuit provided on substrate 26 calculates the rotation direction and rotation speed of motor rotor 23 based on the sensor signal from motor rotation sensor 27.

[0061] As shown in Fig. 10, vane position sensor 28 is composed of two magnetic elements 281, 282 that detect the P position and not P position of vane rotor 63. As viewed in Fig. 10, magnetic elements 281, 282 are disposed directly behind yokes 491, 492 shown in Fig. 6, respectively. Yokes 491, 492, which are cylindrically formed from a soft magnetic material, are inserted between pump housing 31 and pump plate 50, which are formed from a non-magnetic material.

[0062] The operation of the vane rotor 63 in the hydraulic actuator unit 60 will be described with reference to Figure 12. The vane rotor 63 rotates within the vane housing 61 around the rotation axis Q by hydraulic pressure supplied from the pump unit 30. The vane housing 61 has, for example, four vane chambers 621-624 inside. The vane chambers 621-624 each have a sector shape with an arc-shaped inner wall on the radially outer side. In the figure, the lead lines of the vane chambers 621-624 are drawn out from the radially outer inner wall.

[0063] The vane rotor 63 is formed of a non-magnetic material and is provided with, for example, four vanes 641-644 corresponding to the vane chambers 621-624. The number of vanes is not limited to four, as long as it is one or more. A seal material is provided on the sliding portion of the radial outer wall of each vane 641-644. Each vane 641-644 is rotatable circumferentially in the corresponding vane chamber 621-624. Lead-side hydraulic chambers 651-654 are formed on one side of the circumferential direction of the vanes 641-644 in the vane chambers 621-624. Furthermore, return-side hydraulic chambers 661-664 are formed on the other side of the circumferential direction of the vanes 641-644. Although not shown, the lead-side hydraulic chambers 651-654 are connected to each other via distribution oil passages. Similarly, the return-side hydraulic chambers 661-664 are connected to each other via distribution oil passages.

[0064] A chamber bottom discharge opening 625 communicating with the discharge port 68 is formed at the bottom of one of the four vane chambers 621. The vane chamber 621 in which the chamber bottom discharge opening 625 is formed is referred to as the "first vane chamber," and the vane 641 housed in the first vane chamber 621 is referred to as the "first vane." In FIG. 12 , the vanes are arranged clockwise from the first vane chamber 621, namely, the second vane chamber 622, the third vane chamber 623, and the fourth vane chamber 624. Similarly, the vanes are arranged clockwise from the first vane 641, namely, the second vane 642, the third vane 643, and the fourth vane 644. A vane magnet 649 used for detection by the vane position sensor 28 is attached to one of the vanes (for example, the fourth vane 644).

[0065] The hydraulic actuator unit 60 operates to switch between an advance state and a return state by hydraulic pressure supplied from the pump unit 30. When hydraulic pressure is supplied to the advance hydraulic chambers 651-654, the vane rotor 63 rotates in one direction (counterclockwise in FIG. 12) to enter the advance state. When hydraulic pressure is supplied to the return hydraulic chambers 661-664, the vane rotor 63 rotates in the other direction (clockwise in FIG. 12) to enter the return state. The upper diagram in FIG. 12 corresponds to the advance state, and the lower diagram corresponds to the return state. The rotational operating angle is represented as θr.

[0066] Here, the terms "advance state" and "return state" are merely terms used to conveniently distinguish between two opposing polar states, and either state may be defined as the advance state or the return state. In this specification, the advance state of the vane rotor 63 corresponds to the P position, and the return state of the vane rotor 63 corresponds to the not P position. The hydraulic actuator unit 60 locks the parking lock mechanism 80 in the advance state, and unlocks the parking lock mechanism 80 in the return state.

[0067] Operation of vane rotor 63 changes the position of vane magnet 649 attached to fourth vane 644. Yokes 491, 492 transmit the magnetism of vane magnet 649 at the P position and not P position to magnetic elements 281, 282 of vane position sensor 28. Each magnetic element 281, 282 detects the magnetism transmitted from vane magnet 649 via yokes 491, 492 and outputs a sensor signal. A control circuit provided on substrate 26 estimates the operating position of vane rotor 63 based on the sensor signal of vane position sensor 28.

[0068] In this way, by adopting a configuration in which the magnetic elements 281 and 282 detect the magnetism of the vane magnet 649, a relatively inexpensive vane position detection means can be realized.

[0069] 1, the pump gear 32 is disposed between the base plate 26 and the vane rotor 63 in the axial direction, thereby reducing the size of the pump gear 32 in the plane perpendicular to the axis. The distance Lv from the base plate 26 to the vane rotor 63 is greater than the distance Lm from the base plate 26 to the vane rotor 63. In other words, the base plate 26 is disposed closer to the motor rotor 23 than the vane rotor 63.

[0070] Furthermore, the pump housing 31 and pump plate 50, which serve as the "pump housing," are made of a non-magnetic material such as an aluminum alloy or resin. Based on this, yokes 491, 492 made of a soft magnetic material are provided on the pump housing 31 and pump plate 50 between the vane position sensor 28 and the vane magnet 649. This increases the magnetism transmitted to the vane position sensor 28, improving the accuracy of detecting the vane position.

[0071] 13 and 14, which are exploded schematic views corresponding to FIG. 2, the configurations of integrated pump devices 10A and 10B according to other embodiments, relating to the arrangement of the vane rotor 63 relative to the motor section 20 and the pump section 30, will be described. In these other embodiments, components that are substantially the same as those in the above embodiment are given the same reference numerals, and their description will be omitted. The vane rotor 63 is not limited to being arranged coaxially with the motor output shaft 24, but may also be arranged parallel to the motor output shaft 24 on the same side of the motor section 20 as the pump section 30.

[0072] 13, the integrated pump device 10A has the same axial arrangement of the vane rotor 63 as the integrated pump device 10 of the first embodiment, but differs in its arrangement in the plane perpendicular to the axis. In the integrated pump device 10A, the rotation axis Q of the vane rotor 63 is arranged parallel to the rotation axis O of the motor output shaft 24 at a position different from the rotation axis O of the motor output shaft 24. As with the integrated pump device 10 of the first embodiment, a yoke 49 that transmits the magnetism of the vane magnet 649 to the vane position sensor 28 is provided across the pump housing 31 and pump plate 50.

[0073] The integrated pump device 10B shown in Figure 14 differs from the integrated pump device 10 of the previous embodiment in both the axial and axial-orthogonal plane arrangement of the vane rotor 63. The rotation axis Q of the vane rotor 63 is parallel to the rotation axis O of the motor output shaft 24, and the vane rotor 63 is arranged axially in parallel with the pump gear 32 of the pump section 30. The vane position sensor 28 provided on the vane surface 262 of the base plate 26 is adjacent to and directly opposed to the vane magnet 649 provided on the vane rotor 63. In this configuration, the yoke 49 is not required, and the pump housing 31 and pump plate 50 are not shown.

[0074] In the integrated pump devices 10A and 10B as well, a motor rotation sensor 27 is provided on a motor surface 261 on the motor rotor 23 side of the base plate 26, and a vane position sensor 28 is provided on a vane surface 262 on the vane rotor 63 side. By providing two types of sensors 27, 28 on both sides of the base plate 26, the physical size of the integrated pump devices 10A and 10B can be reduced.

[0075] (b) The substrate 26 of one embodiment shown in Figures 9 and 10 has a hole 263 formed therein through which the motor output shaft 24 passes. In contrast, a substrate 26C of another embodiment shown in Figure 15 has a cutout 264 with a partially open outer periphery instead of the hole 263 with a closed outer periphery. The pump unit 30 is connected to the motor output shaft 24 that passes through the cutout 264 of the substrate 26 on the opposite side of the substrate 26 from the motor unit 20. This allows the size of the integrated pump device 10 to be reduced in the axially orthogonal plane, as in the first embodiment.

[0076] (c) The "pump housing" is not limited to a configuration in which the pump plate 50 covers one end face of the pump housing 31 as in the above embodiment. It may be anything that houses the pump gear 32 in the internal pump chamber 33 and functions as a housing for the pump section 30. When the end face of the pump housing made of one member directly faces the vane magnet 649, the yokes 491, 492 do not straddle two members, but are provided only on the pump housing made of one member. Furthermore, a rotating body other than a gear may be used as the "pump rotating body."

[0077] (d) The application of the integrated pump device 10 of the present disclosure is not limited to operating the parking lock mechanism 80 of an electric vehicle. The target of the rotational output of the hydraulic actuator unit 60 may be any mechanism that can be switched between an advance state and a return state.

[0078] As described above, the present disclosure is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit of the present disclosure.

[0079] (Disclosure of Technical Ideas) This specification discloses multiple technical ideas described in the following multiple clauses. Some clauses may be described in a multiple dependent form, with the subsequent clause alternatively referring to the preceding clause. Furthermore, some clauses may be described in a multiple dependent form, with the subsequent clause referring to another multiple dependent clause. These multiple dependent clauses define multiple technical ideas.

[0080] (Technical Idea 1) A motor section (20) in which a motor rotor (23) housed in a motor housing (21) rotates and outputs driving force via a motor output shaft (24) connected to the motor rotor; a pump section (30) in which a pump rotor (32) housed in a pump housing (31, 50) rotates by the driving force of the motor output shaft and generates hydraulic pressure; a hydraulic actuator section (60) in which a vane rotor (63) having one or more vanes (641-644) rotates within a vane housing (61) by hydraulic pressure supplied from the pump section, and the operating direction of the vane rotor switches depending on the rotation direction of the pump section; and a substrate (26) on which a plurality of electronic elements (266, 267, 268) are mounted, which is disposed between the motor rotor and the vane rotor in the axial direction, assuming that the direction of the motor output shaft is the axial direction. an integrated pump device in which the vane rotor is arranged coaxially with the motor output shaft on the opposite side of the pump section from the motor section, or arranged parallel to the motor output shaft on the same side of the motor section as the pump section, and the substrate is provided with a motor rotation sensor (27) that detects the rotation of the motor rotor on a motor surface (261) that is the surface facing the motor rotor, and a vane position sensor (28) that detects the operating position of the vane rotor on a vane surface (262) that is the surface facing the vane rotor. (Technical Concept 2) The substrate has a hole (263) or notch (264) through which the motor output shaft passes, and the pump section is connected to the motor output shaft that passes through the hole or notch of the substrate on the opposite side of the substrate from the motor section.(Technical Idea 3) An integrated pump device according to Technical Idea 2, wherein the motor output shaft is supported by the motor housing and a convex portion (37) formed on the pump housing coaxially with the motor output shaft, the motor rotor has a plurality of N poles and S poles arranged alternately in the circumferential direction and is fitted with a ring magnet (25) used for detection by the motor rotation sensor, and the ring magnet and the convex portion of the pump housing are arranged on the same plane perpendicular to the axial direction so as to satisfy the condition that the inner diameter (Dmi) of the ring magnet > the outer diameter (Dph) of the convex portion. (Technical Idea 4) The integrated pump device according to Technical Idea 2 or 3, wherein the motor rotor has multiple north and south poles arranged alternately in the circumferential direction and is equipped with a ring magnet (25) used for detection by the motor rotation sensor, and where, among the electronic elements mounted on the board, an element having a height exceeding the sum of the height (Hm) of the ring magnet and the axial clearance (δm) from the motor face of the board to the ring magnet is defined as a large element, the large element is arranged on the motor face of the board so as to satisfy the condition: Half the outer diameter of the ring magnet (Rmo)≦Shortest distance (Rk) from the center of the ring magnet to the outer surface of the large element, or the large element is arranged on the vane face of the board. (Technical Idea 5) The integrated pump device according to any one of Technical Ideas 1 to 4, wherein the vane rotor is formed of a non-magnetic material, and a vane magnet (649) used for detection by the vane position sensor is attached to one of the vanes (644). (Technical Idea 6) An integrated pump device according to Technical Idea 5, wherein the pump rotor is disposed axially between the base plate and the vane rotor, and the base plate is disposed closer to the motor rotor than the vane rotor, the pump housing is formed of a non-magnetic material, and the pump housing is provided with a yoke (491, 492) formed of a soft magnetic material that transmits the magnetism of the vane magnet to the vane position sensor.(Technical Idea 7) The integrated pump device according to any one of Technical Ideas 1 to 6, wherein positioning members (191-193) are provided to position the pump housing relative to the base plate, the motor housing, and the vane housing. (Technical Idea 8) The integrated pump device according to any one of Technical Ideas 1 to 7, wherein the base plate has a plurality of motor terminal wire connection holes (265) into which motor terminal wires (225) connected to motor windings of the motor section are connected, and the pump housing has a connection window (385) for connecting the motor terminal wires in an area that includes the plurality of motor terminal wire connection holes when projected in the axial direction. (Technical Idea 9) The integrated pump device according to any one of Technical Ideas 1 to 8, wherein the pump section has a spool valve (40) arranged on one side of a pump chamber (33) from which oil is pumped, for switching an intake oil passage to the pump chamber, and discharge oil passages (331, 332) from the pump chamber to the hydraulic actuator section are arranged on the opposite side of the spool valve relative to the pump chamber. (Technical Idea 10) The integrated pump device according to any one of Technical Ideas 1 to 9, wherein the pump housing is formed with an outside air inlet hole (386) that introduces outside air into the internal space (360) in which the substrate is housed.

[0081] The present disclosure has been described based on the embodiments. However, the present disclosure is not limited to the embodiments and structures. The present disclosure also encompasses various modifications and variations within the scope of equivalents. Furthermore, various combinations and forms, including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure.

Claims

1. A motor section (20) in which a motor rotor (23) housed in a motor housing (21) rotates and outputs driving force via a motor output shaft (24) connected to the motor rotor; a pump section (30) in which a pump rotor (32) housed in a pump housing (31, 50) rotates by the driving force of the motor output shaft and generates hydraulic pressure; a hydraulic actuator section (60) in which a vane rotor (63) having one or more vanes (641-644) rotates within a vane housing (61) by hydraulic pressure supplied from the pump section, and the operating direction of the vane rotor changes depending on the rotation direction of the pump section; and a substrate (26) on which a plurality of electronic elements (266, 267, 268) are mounted, which is disposed between the motor rotor and the vane rotor in the axial direction, assuming that the direction of the motor output shaft is the axial direction. The vane rotor is arranged coaxially with the motor output shaft on the opposite side of the pump section from the motor section, or arranged parallel to the motor output shaft on the same side of the motor section as the pump section, and the substrate has a motor rotation sensor (27) for detecting rotation of the motor rotor provided on a motor surface (261) that is the surface facing the motor rotor, and a vane position sensor (28) for detecting the operating position of the vane rotor provided on a vane surface (262) that is the surface facing the vane rotor.

2. The integrated pump device of claim 1, wherein the substrate has a hole (263) or notch (264) through which the motor output shaft passes, and the pump section is connected to the motor output shaft passing through the hole or notch in the substrate on the opposite side of the substrate from the motor section.

3. An integrated pump device as described in claim 2, wherein the motor output shaft is supported by the motor housing and a convex portion (37) formed coaxially with the motor output shaft on the pump housing, the motor rotor has multiple north and south poles arranged alternately in the circumferential direction and is fitted with a ring magnet (25) used for detection by the motor rotation sensor, and the ring magnet and the convex portion of the pump housing are arranged on the same plane perpendicular to the axial direction so as to satisfy the condition that the inner diameter (Dmi) of the ring magnet > the outer diameter (Dph) of the convex portion.

4. The integrated pump device of claim 2, wherein the motor rotor has multiple north and south poles arranged alternately in the circumferential direction and is fitted with a ring magnet (25) used for detection by the motor rotation sensor, and among the electronic elements mounted on the board, if an element having a height exceeding the sum of the height (Hm) of the ring magnet and the axial clearance (δm) from the motor face of the board to the ring magnet is defined as a large element, the large element is arranged on the motor face of the board so as to satisfy the condition: half the outer diameter of the ring magnet (Rmo) ≦ the shortest distance (Rk) from the center of the ring magnet to the outer surface of the large element, or the large element is arranged on the vane face of the board.

5. The integrated pump device of claim 1, wherein the vane rotor is formed of a non-magnetic material, and a vane magnet (649) is attached to one of the vanes (644) for detection by the vane position sensor.

6. An integrated pump device as described in claim 5, wherein the pump rotor is arranged axially between the base plate and the vane rotor, and the base plate is arranged closer to the motor rotor than the vane rotor, the pump housing is formed of a non-magnetic material, and the pump housing is provided with a yoke (491, 492) formed of a soft magnetic material that transmits the magnetism of the vane magnet to the vane position sensor.

7. An integrated pump device according to any one of claims 1 to 6, further comprising positioning members (191-193) for positioning the pump housing, the base plate, the motor housing and the vane housing relative to one another.

8. An integrated pump device as claimed in any one of claims 1 to 6, wherein the base plate has a plurality of motor terminal wire connection holes (265) into which motor terminal wires (225) connected to the motor windings of the motor section are connected, and the pump housing has a connection work window (385) for connecting the motor terminal wires in an area that includes the plurality of motor terminal wire connection holes when projected in the axial direction.

9. An integrated pump device as claimed in any one of claims 1 to 6, wherein the pump section has a spool valve (40) arranged on one side of a pump chamber (33) through which oil is pumped, for switching the intake oil passage to the pump chamber, and a discharge oil passage (331, 332) from the pump chamber to the hydraulic actuator section arranged on the opposite side of the pump chamber from the spool valve.

10. An integrated pump device as described in any one of claims 1 to 6, wherein the pump housing is formed with an outside air inlet hole (386) for introducing outside air into the internal space (360) in which the substrate is housed.

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