Motor Unit

Abstract

To provide a motor unit which can suppress infiltration of liquid to the inside of a motor.SOLUTION: A motor unit according to an embodiment comprises: a motor having a shaft rotatable around a rotational axis and provided with a first space; a rotation member coupled with the shaft; a housing provided with a second space which accommodates at least a part of the rotation member; and a guide member having a peripheral wall surrounding the rotational axis between the first space and the second space and provided with a third space inside the peripheral wall, wherein a fourth space located outside the first space opens in a direction crossing the rotational axis in at least one of the second space and the third space, an inner surface of the third space has a guide part closer to the fourth space than the rotational axis in a radial direction, and the guide part is separated from the rotational axis as it is closer to the fourth space in the axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a motor unit. [Background technology]

[0002] Motors rotate various objects, and liquids such as lubricating oil and oil pumped by a pump may adhere to the objects. Conventionally, there is known a device in which a flow path is provided between the motor and the object to discharge the liquid. Discharging the liquid from the flow path prevents the liquid from penetrating into the motor (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-106574 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional configurations, liquid moving downward due to gravity is discharged from the flow path, while liquid splashed by a rotating body such as a motor shaft adheres to the inner surface of the device, and may move along the inner surface of the device toward the inside of the motor.

[0005] Therefore, the present invention has been made in view of the above, and provides a motor unit that can prevent liquid from entering the inside of the motor. [Means for solving the problem]

[0006] As an example, a motor unit according to an embodiment of the present invention may include a motor having a shaft rotatable about a rotation axis, a rotor rotatable about the rotation axis together with the shaft, and a stator surrounding the rotor, the motor having a first space provided to house the rotor and the stator, a rotating member connected to the shaft outside the first space and rotatable about the rotation axis, a housing to which the motor is attached and having a second space provided to house at least a part of the rotating member, and a peripheral wall located between the first space and the second space and surrounding the rotation axis, the housing having a third space inside the peripheral wall communicating with the second space. Slope member and a fourth space located outside the first space, Below the rotation axis The second space and The third space provided on the inner surface of at least one of opening through which at least one of them is in communication. The inner surface of the third space is a lower part located below the rotation axis and bottom teeth, The closer to the opening of the fourth space, the lower it is located. Therefore, for example, if liquid adheres to the rotating shaft and the rotating member, the liquid will be scattered by centrifugal force. Since the peripheral wall surrounds the rotating shaft, the inner surface of the third space can catch the scattered liquid. Opening is located below the rotation axis For The liquid received on the inner surface of the third space is moved by gravity. bottom Through the fourth space Opening Therefore, the motor unit can prevent the splashed liquid from entering the first space. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a cross-sectional view that schematically shows a hydraulic pressure control device according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view that schematically shows a part of the hydraulic pressure control device of the embodiment. [Figure 3] FIG. 3 is an exploded perspective view of the coupling, the motor shaft, and the pump shaft of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment will be described below with reference to FIGS. 1 to 3. In this specification, components according to the embodiment and descriptions of the components may be described using multiple expressions. The components and their descriptions are merely examples and are not limited by the expressions in this specification. The components may also be identified by names different from those in this specification. Furthermore, the components may also be described using expressions different from those in this specification.

[0009] FIG. 1 is a cross-sectional view that schematically shows a hydraulic pressure control device 10 according to one embodiment. The hydraulic pressure control device 10 is an example of a motor unit, and may also be called a pump unit. The hydraulic pressure control device 10 is mounted on a vehicle 1, such as an automobile. The hydraulic pressure control device 10 adjusts the pressure (hydraulic pressure) in a hydraulic line of a brake device of the vehicle 1. Note that the motor unit is not limited to the hydraulic pressure control device 10.

[0010] As shown in the drawings, for convenience, an X-axis, a Y-axis, and a Z-axis are defined in this specification. The X-axis, the Y-axis, and the Z-axis are perpendicular to one another. The X-axis is aligned along the width of the hydraulic control device 10. The Y-axis is aligned along the length of the hydraulic control device 10. The Z-axis is aligned along the height of the hydraulic control device 10.

[0011] Furthermore, in this specification, the X direction, Y direction, and Z direction are defined. The X direction is a direction along the X axis, and includes the +X direction indicated by the X axis arrow and the -X direction opposite to the X axis arrow. The Y direction is a direction along the Y axis, and includes the +Y direction indicated by the Y axis arrow and the -Y direction opposite to the Y axis arrow. The Z direction is a direction along the Z axis, and includes the +Z direction (upward) indicated by the Z axis arrow and the -Z direction (downward) opposite to the Z axis arrow.

[0012] The +Z direction is, for example, the vertically upward direction when the vehicle 1 is placed on a horizontal ground surface. Similarly, the -Z direction is the vertically downward direction when the vehicle 1 is placed on a horizontal ground surface. Note that the hydraulic pressure control device 10 may be placed so that the Z direction is different from the vertical direction.

[0013] The hydraulic control device 10 includes a housing 11, a motor 12, a pump 13, a coupling 14, and an electronic control unit (ECU) 15. The coupling 14 is an example of a joint. The hydraulic control device 10 also includes various components such as a solenoid valve, a pressure sensor, and a reservoir.

[0014] The housing 11 is, for example, a substantially rectangular parallelepiped block made of metal or synthetic resin. However, the housing 11 is not limited to this example. The motor 12, the pump 13, and the ECU 15 are attached to the housing 11. Furthermore, various other components are attached to the housing 11.

[0015] The housing 11 has a first mounting surface 21 and a second mounting surface 22. The first mounting surface 21 and the second mounting surface 22 are outer surfaces of the housing 11. The first mounting surface 21 is formed to be substantially flat and faces in the +Y direction. The second mounting surface 22 is located on the opposite side of the first mounting surface 21. The second mounting surface 22 is formed to be substantially flat and faces in the -Y direction.

[0016] The housing 11 is provided with a pump mounting hole 25, a through-hole 26, and a communication groove 27. The pump mounting hole 25 is an example of a second space. The through-hole 26 is an example of a fifth space. The communication groove 27 is an example of a fourth space. Other holes and grooves may also be provided in the housing 11. Furthermore, various flow paths are provided in the housing 11.

[0017] The pump mounting hole 25 is a recess recessed in approximately the -Y direction from the first mounting surface 21. The pump mounting hole 25 opens to the first mounting surface 21 at approximately the center of the first mounting surface 21. The pump mounting hole 25 is connected to a hydraulic path of the brake device, for example, through a flow path provided in the housing 11.

[0018] The through hole 26 penetrates the housing 11 substantially in the Y direction. Therefore, the through hole 26 is open at the first mounting surface 21 and the second mounting surface 22. The through hole 26 is spaced apart from the pump mounting hole 25 in the -Z direction. Therefore, the through hole 26 is located lower than the pump mounting hole 25. Note that the through hole 26 may also be spaced apart from the pump mounting hole 25 in another direction.

[0019] The communication groove 27 opens to the first mounting surface 21 and extends between the pump mounting hole 25 and the through-hole 26. Therefore, the communication groove 27 opens to the inner surface 25a of the pump mounting hole 25 and the inner surface 26a of the through-hole 26. The inner surface 25a is the inner surface of the housing 11 that forms (defines, partitions) the pump mounting hole 25. The inner surface 26a is the inner surface of the housing 11 that forms the through-hole 26. The pump mounting hole 25 and the through-hole 26 each communicate with the communication groove 27. Furthermore, the through-hole 26 communicates with the pump mounting hole 25 via the communication groove 27.

[0020] The motor 12 is, for example, a three-phase brushless motor. However, the motor 12 may be another type of motor. The motor 12 has a casing 31, a motor shaft 32, two bearings 33, a rotor 34, a stator 35, an electrode 36, and a slope member 37. The motor shaft 32 is an example of a shaft. The slope member 37 is an example of a guide member. In this embodiment, the slope member 37 is provided in the motor 12. However, the slope member 37 may be a component separate from the motor 12.

[0021] The casing 31 is attached to the first mounting surface 21 of the housing 11. Therefore, the first mounting surface 21 faces the motor 12. The casing 31 covers the pump mounting hole 25, the through-hole 26, and the communication groove 27.

[0022] An internal space 41 is provided inside the casing 31. The internal space 41 is an example of a first space. The internal space 41 accommodates a part of the motor shaft 32, at least one bearing 33, the rotor 34, and the stator 35.

[0023] The motor shaft 32 is rotatably supported about a central axis Ax by a bearing 33. The central axis Ax is an example of a rotation axis. The central axis Ax is the center of rotation of the motor shaft 32.

[0024] The central axis Ax is, for example, the central axis of the motor shaft 32. The center of rotation of the motor shaft 32 may be different from the central axis of the motor shaft 32. The central axis Ax includes not only the central axis inside the motor shaft 32 but also an extension of the central axis outside the motor shaft 32. The central axis Ax extends approximately in the Y direction. A portion of the motor shaft 32 protrudes from the internal space 41 in the -Y direction.

[0025] In this embodiment, for convenience, the axial direction, radial direction, and circumferential direction are defined. The axial direction is the direction along the central axis Ax. That is, the axial direction in this embodiment is approximately equal to the Y direction. The radial direction is the direction perpendicular to the central axis Ax. The circumferential direction is the direction around the central axis Ax.

[0026] The pump mounting hole 25 of the housing 11 is disposed on the central axis Ax. The through hole 26 of the housing 11 is spaced apart from the pump mounting hole 25 in the radial direction. In addition, the communication groove 27 of the housing 11 extends in a substantially radial direction and connects the pump mounting hole 25 and the through hole 26. Therefore, the communication groove 27 opens in a substantially radial direction on the inner surface 25a of the pump mounting hole 25.

[0027] The rotor 34 is coupled to the motor shaft 32. Therefore, the rotor 34 can rotate together with the motor shaft 32 around the central axis Ax. The stator 35 surrounds the rotor 34 and is fixed to the casing 31. When a drive current is applied to the stator 35, the rotor 34 and the motor shaft 32 rotate together around the central axis Ax.

[0028] The casing 31 has an outer frame 45 and end frames 46. The internal space 41 is a space surrounded by the outer frame 45 and the end frames 46. In other words, the internal space 41 is formed by the outer frame 45 and the end frames 46. However, the internal space 41 is not limited to this example.

[0029] The outer frame 45 has an outer wall 51, an end wall 52, and a mounting flange 53. The outer wall 51 is formed in a generally cylindrical shape extending in the axial direction and surrounds the central axis Ax. The end wall 52 closes the end of the outer wall 51 in the +Y direction. The end wall 52 supports one of the bearings 33. The mounting flange 53 extends radially outward from the end of the outer wall 51 in the -Y direction along the first mounting surface 21.

[0030] The end frame 46 is attached to the outer frame 45 and closes the end of the outer wall 51 in the −Y direction. The end frame 46 has an end wall 55, an inner wall 56, a bottom wall 57, and a support wall 58.

[0031] The end wall 55 is formed in a generally annular shape extending in the circumferential direction and generally perpendicular to the central axis Ax. The inner wall 56 is formed in a generally cylindrical shape extending in the +Y direction from the end of the end wall 55 on the radially inner side, and surrounds the central axis Ax.

[0032] The bottom wall 57 protrudes radially inward from the end of the inner wall 56 in the +Y direction. The bottom wall 57 is formed in a generally annular shape and surrounds the central axis Ax. The support wall 58 is formed in a generally cylindrical shape extending in the +Y direction from the end of the inner wall 56 on the radially inner side and surrounds the central axis Ax. The support wall 58 supports the other bearing 33.

[0033] The end frame 46 has an outer surface 46a and a recessed surface 46b. The outer surface 46a is provided on the end wall 55 and faces the outside of the motor 12. The outer surface 46a faces, for example, in the -Y direction. The outer surface 46a of the motor 12 and the first mounting surface 21 of the housing 11 face each other. The outer surface 46a is spaced apart from the first mounting surface 21.

[0034] The concave surface 46b is provided on the inner wall 56 and the bottom wall 57. The concave surface 46b is recessed from the outer surface 46a in approximately the +Y direction (axial direction). The concave surface 46b is located outside the internal space 41. The space inside the concave surface 46b communicates with the internal space 41 through the space inside the support wall 58. A bearing 33 supported by the support wall 58 separates the space inside the concave surface 46b from the internal space 41.

[0035] The mounting flange 53 of the outer frame 45 is attached to the housing 11 by, for example, screws. A sealant, for example, is provided between the mounting flange 53 and the first mounting surface 21. The sealant liquid-tightly seals the space between the casing 31 and the first mounting surface 21.

[0036] The electrodes 36 are, for example, terminals for supplying a driving current to the motor 12, and are electrically connected to the stator 35. The electrodes 36 may also be terminals electrically connected to sensors provided in the motor 12.

[0037] The electrode 36 protrudes substantially in the -Y direction from the outer surface 46a of the end frame 46. The electrode 36 passes through the through-hole 26 beyond the second mounting surface 22. That is, the electrode 36 is at least partially housed in the through-hole 26.

[0038] The slope member 37 is made of an insulating material such as synthetic resin. However, the material of the slope member 37 is not limited to this example. The slope member 37 has an outer wall 61, a peripheral wall 62, a flange 63, and a cover 64. The flange 63 may also be referred to as a rib. The outer wall 61, the peripheral wall 62, the flange 63, and the cover 64 are integrally formed.

[0039] The outer wall 61 is formed in a generally annular shape that is generally perpendicular to the central axis Ax and extends in the circumferential direction. The outer wall 61 is located between the first mounting surface 21 of the housing 11 and the end wall 55 of the end frame 46. The outer wall 61 is attached to the end frame 46, for example, and covers the outer surface 46a. The outer wall 61 may also be attached to the housing 11.

[0040] The outer wall 61 covers the communication groove 27 that opens to the first mounting surface 21. As a result, the communication groove 27 can serve as a flow path that connects the pump mounting hole 25 and the through-hole 26. In other words, a flow path (communication groove 27) that connects the pump mounting hole 25 and the through-hole 26 is provided between the housing 11 and the motor 12. In the above-described embodiment, the flow path that connects the pump mounting hole 25 and the through-hole 26 is configured by providing a groove (communication groove 27) on the housing 11 side. However, instead of this, a groove may be provided on the motor 12 side, such as the outer wall 61.

[0041] Fig. 2 is a cross-sectional view schematically showing a part of the hydraulic pressure control device 10 of this embodiment. As shown in Fig. 2, the peripheral wall 62 is formed in a cylindrical shape surrounding the central axis Ax. An end 62a of the peripheral wall 62 in the -Y direction is connected to an end of the outer wall 61 on the radially inner side.

[0042] The peripheral wall 62 is located inside the recessed surface 46b of the end frame 46. Therefore, the peripheral wall 62 is disposed in the space inside the recessed surface 46b, and is located between the internal space 41 and the pump mounting hole 25 of the housing 11. Note that at least a portion of the peripheral wall 62 does not have to be located in the space inside the recessed surface 46b.

[0043] A connecting space 65 is provided inside the peripheral wall 62. The connecting space 65 is an example of a third space. The connecting space 65 is a space surrounded by the peripheral wall 62 and is formed by the peripheral wall 62. The connecting space 65 communicates with the pump mounting hole 25 of the housing 11. The connecting space 65 also communicates with the internal space 41 through the space inside the support wall 58.

[0044] The peripheral wall 62 has an inner surface 65a of the connecting space 65. The inner surface 65a is also the inner surface of the cylindrical peripheral wall 62. That is, the inner surface 65a of the peripheral wall 62 forms the connecting space 65. In this embodiment, the inner surface 65a is, for example, a substantially conical (funnel-shaped) curved surface.

[0045] The inner surface 65a tapers in the +Y direction. In other words, the inner surface 65a tapers toward the internal space 41. For this reason, the diameter of the inner surface 65a becomes longer the closer it is to the pump mounting hole 25. In other words, the closer the inner surface 65a is to the pump mounting hole 25 in the axial direction, the farther it is from the central axis Ax. The diameter of the inner surface 65a may change uniformly or may change in stages. Note that the inner surface 65a is not limited to this example.

[0046] The inner surface 65a has a lower portion 71 and an upper portion 72. The lower portion 71 is an example of a guide portion. The lower portion 71 is a portion (lower half) of the inner surface 65a that is located below the central axis Ax. Therefore, the lower portion 71 is closer to the through hole 26 and the communicating groove 27 in the radial direction than the central axis Ax. The upper portion 72 is a portion (upper half) of the inner surface 65a that is located above the central axis Ax.

[0047] As described above, the diameter of the inner surface 65a is longer the closer it is to the pump mounting hole 25. In addition, the communicating groove 27 opens to the inner surface 25a of the pump mounting hole 25. Therefore, the lower part 71 of the inner surface 65a is farther away from the central axis Ax the closer it is to the communicating groove 27 in the axial direction.

[0048] The lower portion 71 has a first end 71a and a second end 71b. The first end 71a is the end of the lower portion 71 in the -Y direction. In other words, the first end 71a is one of the two ends of the lower portion 71 in the axial direction that is closer to the pump mounting hole 25. The second end 71b is the other of the two ends of the lower portion 71 in the axial direction. In other words, the second end 71b is the end of the lower portion 71 in the +Y direction.

[0049] For example, the angle between the central axis Ax and the lower part 71 is set larger than the allowable angle between the central axis Ax and the horizontal direction during the manufacture of the vehicle 1. In this case, even if the vehicle 1 is manufactured so that the central axis Ax is tilted within the allowable angle range with respect to the horizontal direction, the lowest portion of the first end 71a is located lower than the lowest portion of the second end 71b. In other words, the lower part 71 extends at an angle obliquely downward from the second end 71b toward the first end 71a.

[0050] In this embodiment, the entire inner surface 65a is formed in a substantially conical shape. However, the upper portion 72 may be formed, for example, in a substantially cylindrical shape extending in the axial direction. Furthermore, the cross section of the connecting space 65 perpendicular to the central axis Ax is not limited to a circle and may be another shape, such as a rectangle.

[0051] A plurality of recesses 73 may be provided in the inner surface 65a. For example, the recesses 73 are used for chucking during manufacturing. The plurality of recesses 73 are arranged at intervals in the circumferential direction. At each position in the axial direction, the plurality of recesses 73 are spaced apart from the lowest portion of the inner surface 65a.

[0052] The flange 63 protrudes from an end 62b of the peripheral wall 62 toward the central axis Ax. The end 62b is one of the two ends of the peripheral wall 62 in the axial direction that is closer to the internal space 41. The flange 63 is formed in a substantially annular shape and surrounds the central axis Ax. To this end, a hole 75 is provided inside the flange 63. The central axis Ax extends through the hole 75.

[0053] As shown in FIG. 1 , the cover 64 is positioned lower than the peripheral wall 62 and protrudes from the outer wall 61 in approximately the −Y direction. The electrode 36 extends through the inside of the cover 64. The cover 64 is housed in the through hole 26 of the housing 11 together with the electrode 36. The cover 64 covers and protects the electrode 36 in the through hole 26. In the vicinity of the second mounting surface 22, the gap between the inner surface 26a of the through hole 26 and the cover 64 is liquid-tightly sealed.

[0054] The pump 13 is, for example, a gear pump. However, the pump 13 may be another type of pump. At least a portion of the pump 13 is housed in the pump mounting hole 25. The pump 13 can send hydraulic oil to a fluid path of the brake device.

[0055] The pump 13 has a pump shaft 81. The pump shaft 81 is an example of a rotating member. The pump shaft 81 is disposed substantially concentrically with the motor shaft 32 and extends in the axial direction. Note that the central axis of the pump shaft 81 and the central axis Ax of the motor shaft 32 may be slightly misaligned.

[0056] The pump shaft 81 is coupled to, for example, the rotor of the pump 13. The pump shaft 81 is rotatable around the central axis Ax together with the rotor of the pump 13. When the pump shaft 81 and the rotor of the pump 13 rotate around the central axis Ax, the pump 13 pumps hydraulic oil.

[0057] A part of the pump shaft 81 and the rotor of the pump 13 are housed in the pump mounting hole 25. Another part of the pump shaft 81 protrudes outside the pump mounting hole 25 and is housed in the connecting space 65.

[0058] The motor shaft 32 and the pump shaft 81 are connected to each other in the connecting space 65 via the coupling 14. In other words, the motor shaft 32 and the pump shaft 81 are connected to each other inside the concave surface 46b, which is outside the internal space 41. Note that the motor shaft 32 and the pump shaft 81 may also be directly coupled to each other.

[0059] 3 is an exploded perspective view of the coupling 14, the motor shaft 32, and the pump shaft 81 of this embodiment. As shown in FIG.

[0060] The base 85 is a part of the pump shaft 81 that is at least partially housed in the connecting space 65. The base 85 is formed in a generally cylindrical shape extending in the axial direction. The two claws 86 protrude from the base 85 in generally the +Y direction. The two claws 86 are arranged at approximately equal intervals in the circumferential direction.

[0061] The motor shaft 32 has a base 91, two claws 92, and an intermediate portion 93. As shown in FIG. 2 , the base 91 is a portion of the motor shaft 32 located outside the internal space 41. The base 91 is formed in a generally cylindrical shape extending in the axial direction. The base 91 extends through the hole 75 and is surrounded by the flange 63. A portion of the base 91 is located in the connecting space 65.

[0062] The two claws 92 protrude from the base 91 in approximately the -Y direction. The two claws 92 are arranged at approximately equal intervals in the circumferential direction. The claws 92 are located between the base 91 and the base 85 of the pump shaft 81. The claws 92 are closer to the pump mounting hole 25 than the base 91. The claws 92 of the motor shaft 32 and the claws 86 of the pump shaft 81 are arranged alternately in the circumferential direction.

[0063] The coupling 14 is interposed between the claws 92 of the motor shaft 32 and the claws 86 of the pump shaft 81. Therefore, the claws 92 of the motor shaft 32 and the claws 86 of the pump shaft 81 can transmit a rotational force about the central axis Ax to each other via the coupling 14. In this manner, the coupling 14 connects the motor shaft 32 and the pump shaft 81. Note that the motor shaft 32 and the pump shaft 81 may be connected by another joint such as a universal joint.

[0064] As shown in Fig. 3, the base 91 of the motor shaft 32 has an outer peripheral surface 91a. The outer peripheral surface 91a is an example of a first outer peripheral surface. The outer peripheral surface 91a is a cylindrical curved surface that extends substantially in the axial direction and faces radially outward. The outer peripheral surface 91a is surrounded by the flange 63.

[0065] Each of the two claws 92 has an outer peripheral surface 92a. The outer peripheral surface 92a is an example of a second outer peripheral surface. The outer peripheral surface 92a is a cylindrical curved surface extending substantially in the axial direction and facing radially outward. The outer peripheral surface 92a is closer to the pump mounting hole 25 than the outer peripheral surface 91a of the base 91. The outer diameter of the outer peripheral surface 92a of the claw 92 is shorter than the outer diameter of the outer peripheral surface 92a of the base 91.

[0066] The outer peripheral surfaces 91a and 92a do not have to be cylindrical. In this case, the portion of the end of the outer peripheral surface 92a in the +Y direction that is farthest from the central axis Ax is closer to the central axis Ax than the portion of the end of the outer peripheral surface 91a in the -Y direction that is farthest from the central axis Ax.

[0067] The intermediate portion 93 is provided between the base 91 and the claw 92. The intermediate portion 93 has an outer peripheral surface 93a. The outer peripheral surface 93a is an example of a third outer peripheral surface. The outer peripheral surface 93a connects the outer peripheral surface 91a of the base 91 and the outer peripheral surface 92a of the claw 92. Because the outer diameter of the outer peripheral surface 92a is shorter than the outer diameter of the outer peripheral surface 91a, the outer peripheral surface 93a intersects with the outer peripheral surfaces 91a and 92a.

[0068] For example, the outer peripheral surface 93a extends in a substantially conical shape between the outer peripheral surface 91a of the base 91 and the outer peripheral surface 92a of the claw 92. The outer peripheral surface 93a may be perpendicular to the outer peripheral surfaces 91a and 92a.

[0069] 1 includes, for example, a circuit board and various electronic components mounted on the circuit board. Furthermore, the ECU 15 is electrically connected to, for example, the motor 12 and controls the entire hydraulic control device 10. For example, an electrode 36 of the motor 12 is connected to a connector mounted on the circuit board, thereby electrically connecting to the ECU 15. The ECU 15 supplies a drive current to the motor 12 through the electrode 36.

[0070] In the above-described hydraulic control device 10, hydraulic oil may leak from the pump 13. The hydraulic oil moves downward due to gravity. A communication groove 27 opens at the downward end of the pump mounting hole 25, which houses the pump 13. Therefore, the hydraulic oil in the pump mounting hole 25 is discharged through the communication groove 27 to the through-hole 26.

[0071] As described above, the space between the casing 31 and the first mounting surface 21 and the gap between the inner surface 26a of the through-hole 26 and the cover 64 are sealed. Therefore, the hydraulic control device 10 can store the hydraulic oil in the through-hole 26 and the communicating groove 27, and can prevent the hydraulic oil from leaking out of the hydraulic control device 10.

[0072] On the other hand, when the ECU 15 drives the motor 12, the motor shaft 32, the coupling 14, the pump shaft 81, and the rotor of the pump 13 rotate around the central axis Ax. Hydraulic oil may adhere to the motor shaft 32, the coupling 14, and the pump shaft 81. Therefore, the rotating motor shaft 32, the coupling 14, and the pump shaft 81 may scatter the hydraulic oil in a substantially radial direction in the connecting space 65 due to centrifugal force.

[0073] The peripheral wall 62 surrounds the central axis Ax. Therefore, the peripheral wall 62 surrounds the motor shaft 32, the coupling 14, and the pump shaft 81, which extend along the central axis Ax. An inner surface 65a of the peripheral wall 62 receives hydraulic oil that has scattered in the connecting space 65 in a substantially radial direction.

[0074] The lower portion 71 extends obliquely downward from the second end 71b toward the first end 71a. Therefore, the hydraulic oil flows along the lower portion 71 toward the first end 71a. That is, the hydraulic oil flows toward the communicating groove 27 that opens to the inner surface 25a of the pump mounting hole 25.

[0075] The hydraulic oil adhering to the upper portion 72 flows due to gravity along the upper portion 72 in a substantially circumferential direction. The diameter of the upper portion 72 is longer the closer it is to the pump mounting hole 25. Therefore, the hydraulic oil flowing along the upper portion 72 flows so as to approach the communicating groove 27 in the axial direction.

[0076] As described above, the hydraulic oil received on the inner surface 65a of the peripheral wall 62 (connecting space 65) flows toward the communicating groove 27. In this embodiment, the communicating groove 27 communicates with the connecting space 65 via the pump mounting hole 25. Therefore, the hydraulic oil flowing along the inner surface 65a is discharged from the connecting space 65 to the communicating groove 27.

[0077] The connecting space 65, the pump mounting hole 25, the communicating groove 27, and the through-hole 26 are all located outside the internal space 41. Therefore, the hydraulic control device 10 can prevent the hydraulic oil from splashing in the connecting space 65 from entering the internal space 41 by guiding the hydraulic oil to the communicating groove 27.

[0078] For example, the hydraulic oil received in the upper portion 72 may flow along the upper portion 72 toward the internal space 41. In this case, the flange 63 receives the hydraulic oil flowing along the upper portion 72. The hydraulic oil flows along the annular flange 63 toward the lower portion 71 and is discharged into the communicating groove 27 by the lower portion 71.

[0079] Furthermore, for example, when braking the vehicle 1, the first end 71a of the lower portion 71 may temporarily be positioned higher than the second end 71b. In this case, the hydraulic oil may flow along the lower portion 71 toward the internal space 41. However, the flange 63 catches the hydraulic oil flowing along the lower portion 71. When the tilt caused by braking is restored, the hydraulic oil flows along the lower portion 71 toward the communicating groove 27.

[0080] As described above, the flange 63 receives the hydraulic oil flowing along the inner surface 65a toward the internal space 41. Therefore, the hydraulic pressure control device 10 can prevent the hydraulic oil from entering the internal space 41.

[0081] The flange 63 is spaced apart from a base 91 of the motor shaft 32. The distance between the flange 63 and the base 91 is set to a length that can prevent a gap between the flange 63 and the base 91 from retaining hydraulic oil.

[0082] In the motor shaft 32, the outer diameter of the outer peripheral surface 92a of the claw 92 is shorter than the outer diameter of the outer peripheral surface 91a of the base 91. Therefore, the outer peripheral surface 93a of the intermediate portion 93 forms a stepped portion between the outer peripheral surface 91a and the outer peripheral surface 92a.

[0083] Hydraulic oil may flow along the outer peripheral surface 92a of the claw 92 toward the internal space 41. In this case, the stepped outer peripheral surface 93a receives the hydraulic oil. The outer peripheral surface 93a prevents the hydraulic oil from flowing over the outer peripheral surface 93a toward the internal space 41. The hydraulic oil prevented from moving by the outer peripheral surface 93a is scattered toward the inner surface 65a of the connecting space 65 by centrifugal force. Therefore, the hydraulic control device 10 can prevent hydraulic oil adhering to the motor shaft 32 from passing through the hole 75 and entering the internal space 41.

[0084] In this embodiment, the peripheral wall 62 and the flange 63 are provided over the entire circumference around the central axis Ax. However, the peripheral wall 62 and the flange 63 may be provided with holes, notches, or slits.

[0085] In this embodiment, the hydraulic oil is discharged to the communication groove 27 that opens to the inner surface 25a of the pump mounting hole 25. However, a space (fourth space) that opens in a direction intersecting the central axis Ax may be provided on the inner surface 65a of the connecting space 65, and the hydraulic oil may be discharged to that space.

[0086] In this embodiment, the coupling 14, the motor shaft 32, and the pump shaft 81 are located in the connecting space 65. However, one or two of the coupling 14, the motor shaft 32, and the pump shaft 81 may be located outside the connecting space 65.

[0087] In this embodiment, the motor shaft 32 has outer peripheral surfaces 91a, 92a, and 93a. However, the coupling 14 or the pump shaft 81 may have a first outer surface surrounded by the flange 63, a second outer surface having a smaller outer diameter and located near the pump mounting hole 25, and a third outer surface connecting the first and second outer surfaces and intersecting the first and second outer surfaces.

[0088] In the hydraulic pressure control device 10 according to the present embodiment described above, the slope member 37 has a peripheral wall 62 that is located between the internal space 41 and the pump mounting hole 25 of the housing 11 and surrounds the central axis Ax. A connecting space 65 that communicates with the pump mounting hole 25 is provided inside the peripheral wall 62. The connecting groove 27, located outside the internal space 41, opens in a direction intersecting the central axis Ax on at least one of the inner surface 25a of the pump mounting hole 25 and the inner surface 65a of the connecting space 65. The inner surface 65a of the connecting space 65 has a lower portion 71 that is closer to the connecting groove 27 than the central axis Ax in a radial direction perpendicular to the central axis Ax. The lower portion 71 is further away from the central axis Ax as it approaches the connecting groove 27 in the axial direction along the central axis Ax. If hydraulic oil adheres to the rotating motor shaft 32 and pump shaft 81, the centrifugal force will scatter the hydraulic oil. Because the peripheral wall 62 surrounds the central axis Ax, the inner surface 65a of the connecting space 65 can receive the scattered hydraulic oil. When the hydraulic control device 10 is positioned so that the communicating groove 27 is located below the central axis Ax, the hydraulic oil received on the inner surface 65a of the connecting space 65 flows by gravity along the lower part 71 to the communicating groove 27. Therefore, the hydraulic control device 10 can prevent the scattered hydraulic oil from entering the internal space 41, and can thereby prevent the hydraulic oil from adhering to the rotor 34 and the stator 35.

[0089] The inner surface 65a of the connecting space 65 is further away from the central axis Ax as it approaches the communicating groove 27 in the axial direction. In other words, not only the lower portion 71 but substantially the entire inner surface 65a of the connecting space 65 is further away from the central axis Ax as it approaches the communicating groove 27 in the axial direction. This allows hydraulic oil received on the inner surface 65a of the connecting space 65 above the central axis Ax to move downward due to gravity toward the communicating groove 27. Therefore, the hydraulic control device 10 can more efficiently prevent splashed hydraulic oil from entering the internal space 41.

[0090] The motor 12 has an outer surface 46a facing the housing 11 and a concave surface 46b recessed axially from the outer surface 46a and located outside the internal space 41. The motor shaft 32 is connected to the pump shaft 81 inside the concave surface 46b. The circumferential wall 62 is located inside the concave surface 46b. That is, the circumferential wall 62 is disposed in the space inside the concave surface 46b where the motor shaft 32 is connected to the pump shaft 81. Therefore, the hydraulic control device 10 can be prevented from becoming larger in the axial direction than when the circumferential wall 62 is located outside the concave surface 46b.

[0091] Of the two ends of the lower part 71 in the axial direction, the lowest-positioned portion at the first end 71a closest to the pump mounting hole 25 is located lower than the lowest-positioned portion at the second end 71b of the two ends of the lower part 71 in the axial direction. In other words, the lower part 71 extends downward toward the pump mounting hole 25. Therefore, the hydraulic oil flows along the lower part 71 to the communicating groove 27. Therefore, the hydraulic control device 10 can prevent splashed hydraulic oil from entering the internal space 41.

[0092] The slope member 37 has a flange 63. The flange 63 protrudes toward the central axis Ax from an end 62b of the peripheral wall 62 that is closer to the internal space 41, and surrounds the central axis Ax. Therefore, the flange 63 can receive the hydraulic oil that flows along the inner surface 65a of the connecting space 65 toward the internal space 41. Therefore, the hydraulic control device 10 can more reliably prevent the splashed hydraulic oil from entering the internal space 41.

[0093] The motor shaft 32, the pump shaft 81, or the coupling 14 has an outer peripheral surface 91a, an outer peripheral surface 92a, and an outer peripheral surface 93a. The outer peripheral surface 91a is surrounded by the flange 63. The outer peripheral surface 92a is closer to the pump mounting hole 25 than the outer peripheral surface 91a and has a shorter outer diameter than the outer peripheral surface 91a. The outer peripheral surface 93a connects the outer peripheral surfaces 91a and 92a and intersects with the outer peripheral surfaces 91a and 92a. Therefore, the hydraulic oil flowing along the outer peripheral surface 92a toward the outer peripheral surface 91a is received by the outer peripheral surface 93a. The hydraulic oil received by the outer peripheral surface 93a is scattered radially by centrifugal force. In other words, the outer peripheral surface 93a can prevent the hydraulic oil from moving from the outer peripheral surface 92a to the outer peripheral surface 91a. Therefore, the hydraulic pressure control device 10 can prevent the hydraulic oil adhering to the outer peripheral surface 92a from infiltrating into the internal space 41 through the outer peripheral surface 91a.

[0094] The motor shaft 32 has an outer peripheral surface 91a, an outer peripheral surface 92a, and an outer peripheral surface 93a. Of the motor shaft 32, the pump shaft 81, and the coupling 14, the motor shaft 32 is closest to the internal space 41. Most of the hydraulic oil adhering to the pump shaft 81 and the coupling 14 is scattered radially at the pump shaft 81 and the coupling 14 due to centrifugal force. That is, the pump shaft 81 and the coupling 14 reduce the amount of hydraulic oil moving toward the motor shaft 32 through the pump shaft 81 and the coupling 14. The hydraulic oil that moves from the pump shaft 81 and the coupling 14 to the motor shaft 32 is received by the outer peripheral surface 93a and scattered radially by centrifugal force. Therefore, the hydraulic control device 10 can reduce the amount of hydraulic oil moving toward the outer peripheral surface 93a at the pump shaft 81 and the coupling 14, thereby more reliably preventing the hydraulic oil from entering the internal space 41 through the outer peripheral surface 91a.

[0095] The housing 11 is provided with a through hole 26 that communicates with the communication groove 27. The motor 12 has an electrode 36 accommodated in the through hole 26. The slope member 37 is formed integrally with the peripheral wall 62 and has a cover 64 that covers the electrode 36 in the through hole 26. Therefore, hydraulic oil received on the inner surface 65a of the connecting space 65 flows through the connecting groove 27 to the through hole 26. Because the peripheral wall 62 that forms the connecting space 65 and the cover 64 that covers the electrode 36 are formed integrally, adhesion of hydraulic oil to the electrode 36 can be suppressed. Furthermore, compared to when the peripheral wall 62 and the cover 64 are formed separately, the hydraulic control device 10 can suppress hydraulic oil from penetrating gaps between the slope member 37 and other components, allowing the hydraulic oil to flow smoothly from the connecting space 65 to the through hole 26. Furthermore, because the hydraulic control device 10 can allow hydraulic oil to flow through the through hole 26, it can store hydraulic oil in a larger space.

[0096] In the above embodiment, the pump shaft 81 of the pump 13 is an example of a rotating member. However, the rotating member is not limited to this example and may be a gear, an arm, or another rotating member. When the motor shaft 32 is connected to a rotating member other than the pump 13, the slope member 37 prevents, for example, lubricating oil of the rotating member from entering the internal space 41.

[0097] The motor unit according to at least one embodiment described above may, for example, include a motor having a shaft rotatable about a rotation axis, a rotor rotatable about the rotation axis together with the shaft, and a stator surrounding the rotor, the motor having a first space provided to house the rotor and the stator; a rotating member coupled to the shaft outside the first space and rotatable about the rotation axis; a housing to which the motor is attached, the housing having a second space provided to house at least a part of the rotating member; and a housing having a first space and a second space provided to house the first space and the second space. and a guide member having a peripheral wall located between the first space and the second space and surrounding the rotation shaft, with a third space provided inside the peripheral wall and communicating with the second space. A fourth space located outside the first space opens in a direction intersecting the rotation shaft on at least one of the inner surfaces of the second space and the third space, and the inner surface of the third space has a guide portion closer to the fourth space than the rotation shaft in a radial direction perpendicular to the rotation shaft, and the guide portion is farther from the rotation shaft as it approaches the fourth space in an axial direction along the rotation shaft. Therefore, for example, if liquid adheres to the rotating shaft and rotating member, the liquid will scatter due to centrifugal force. Because the peripheral wall surrounds the rotation shaft, the inner surface of the third space can catch the scattered liquid. When the motor unit is positioned so that the fourth space is located below the rotation shaft, the liquid caught on the inner surface of the third space flows due to gravity down the guide portion into the fourth space. Therefore, the motor unit can prevent the splashed liquid from entering the first space, and can also prevent the liquid from adhering to the rotor and the stator.

[0098] In the motor unit, for example, the inner surface of the third space is farther from the rotation shaft as it approaches the fourth space in the axial direction. Therefore, for example, liquid received on the inner surface of the third space above the rotation shaft can move downward due to gravity toward the fourth space. Therefore, the motor unit can more efficiently prevent splashed liquid from entering the first space.

[0099] In the above motor unit, as one example, the motor has an outer surface facing the housing and a concave surface recessed from the outer surface in the axial direction and located outside the first space, the shaft is connected to the rotating member inside the concave surface, and the circumferential wall is located inside the concave surface. Thus, as one example, the circumferential wall is disposed in the space inside the concave surface where the shaft is connected to the rotating member. Therefore, the motor unit can be prevented from becoming larger in the axial direction compared to when the circumferential wall is located outside the concave surface.

[0100] In the above motor unit, as one example, the lowest-positioned portion of one of the ends of the guide portion in the axial direction, which is closest to the second space, is located lower than the lowest-positioned portion of the other of the ends of the guide portion in the axial direction. Therefore, as one example, the guide portion extends downward toward the second space. Therefore, liquid flows along the guide portion into the fourth space. Therefore, the motor unit can prevent splashed liquid from entering the first space.

[0101] In the above motor unit, as one example, the guide member has a flange that protrudes toward the rotary shaft from one of both ends of the peripheral wall in the axial direction that is closer to the first space and surrounds the rotary shaft. Therefore, as one example, the flange can receive liquid that flows along the inner surface of the third space toward the first space. Therefore, the motor unit can more reliably prevent splashed liquid from entering the first space.

[0102] In the motor unit, for example, the shaft, the rotating member, or the joint connecting the shaft and the rotating member has a first outer peripheral surface surrounded by the flange, a second outer peripheral surface closer to the second space than the first outer peripheral surface, and a third outer peripheral surface connecting the first outer peripheral surface and the second outer peripheral surface and intersecting the first outer peripheral surface and the second outer peripheral surface, the outer diameter of the second outer peripheral surface being shorter than the outer diameter of the first outer peripheral surface. Therefore, for example, liquid flowing along the second outer peripheral surface toward the first outer peripheral surface is received by the third outer peripheral surface. The liquid received by the third outer peripheral surface is scattered radially by centrifugal force. In other words, the third outer peripheral surface can prevent liquid from moving from the second outer peripheral surface to the first outer peripheral surface. Therefore, the motor unit can prevent liquid adhering to the second outer peripheral surface from penetrating into the first space through the first outer peripheral surface.

[0103] In the above motor unit, as an example, the shaft has the first outer peripheral surface, the second outer peripheral surface, and the third outer peripheral surface. Therefore, as an example, since the shaft is closest to the first space among the shaft, the rotating member, and the joint, most of the liquid adhering to the rotating member and the joint is scattered radially at the rotating member and the joint due to centrifugal force. That is, the rotating member and the joint reduce the liquid moving toward the shaft along the rotating member and the joint. The liquid that moves from the rotating member and the joint to the shaft is received by the third outer peripheral surface and scattered radially by centrifugal force. Therefore, the motor unit can reduce the liquid moving toward the third outer peripheral surface at the rotating member and the joint, and can more reliably prevent the liquid from entering the first space through the first outer peripheral surface.

[0104] In the above motor unit, for example, the housing is provided with a fifth space communicating with the fourth space, the motor has an electrode at least partially accommodated in the fifth space, and the guide member is integrally formed with the peripheral wall and has a cover covering the electrode in the fifth space. Thus, for example, liquid received on the inner surface of the third space flows through the fourth space into the fifth space. Because the peripheral wall forming the third space and the cover covering the electrode are integrally formed, adhesion of the liquid to the electrode can be suppressed. Furthermore, compared to a motor unit in which the peripheral wall and the cover are formed separately, the motor unit can suppress liquid from penetrating gaps between the guide member and other components, allowing the liquid to flow smoothly from the third space to the fifth space. Furthermore, because the motor unit can allow liquid to flow into the fifth space, a larger space can be stored.

[0105] In the above description, suppression is defined as, for example, preventing an event, action, or influence from occurring, or reducing the degree of an event, action, or influence. Also, in the above description, restriction is defined as, for example, preventing movement or rotation, or allowing movement or rotation within a predetermined range and preventing movement or rotation beyond the predetermined range.

[0106] While the embodiments of the present invention have been described above, the above-described embodiments and modifications are merely examples and are not intended to limit the scope of the invention. The above-described embodiments and modifications can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the configurations and shapes of each embodiment and each modification can be partially interchanged. [Explanation of symbols]

[0107] 10...hydraulic pressure control device (motor unit), 11...housing, 12...motor, 14...coupling (joint), 25...pump mounting hole (second space), 25a...inner surface, 26...through hole (fifth space), 27...communicating groove (fourth space), 32...motor shaft (shaft), 34...rotor, 35...stator, 36...electrode, 37...slope member (guide member), 41...internal space (first space), 4 6a...outer surface, 46b...concave surface, 62...circumferential wall, 62b...end, 63...flange, 64...cover, 65...connecting space (third space), 65a...inner surface, 71...lower part (guide part), 71a...first end (end), 71b...second end (end), 81...pump shaft (rotating member), 91a...outer peripheral surface (first outer peripheral surface), 92a...outer peripheral surface (second outer peripheral surface), 93a...outer peripheral surface (third outer peripheral surface), Ax...central axis (rotation axis).

Claims

1. a motor including a shaft rotatable about a rotation axis, a rotor rotatable about the rotation axis together with the shaft, and a stator surrounding the rotor, the motor having a first space provided to accommodate the rotor and the stator; a rotating member coupled to the shaft outside the first space and rotatable about the rotation axis; a housing to which the motor is attached and having a second space for accommodating at least a portion of the rotating member; a slope member located between the first space and the second space and having a peripheral wall surrounding the rotation shaft, the peripheral wall having a third space communicating with the second space; Equipped with a fourth space located outside the first space communicates with at least one of the second space and the third space through an opening provided on an inner surface of at least one of the second space and the third space below the rotation axis; the inner surface of the third space has a lower portion located below the rotation axis, The lower portion is located lower as it approaches the opening of the fourth space. Motor unit.

2. the inner surface of the third space is farther from the rotation axis as it approaches the opening in the direction along the rotation axis; The motor unit according to claim 1.

3. the motor has an outer surface facing the housing and a concave surface recessed from the outer surface in a direction along the rotation shaft and positioned outside the first space, the shaft is coupled to the rotating member inside the concave surface; The peripheral wall is located inside the concave surface. The motor unit according to claim 1 or 2.

4. a portion of the lower portion that is closest to the second space and that is located at the lowest position in one of both ends of the lower portion in the direction along the rotation axis is located lower than a portion of the lower portion that is located at the lowest position in the other of both ends of the lower portion in the direction along the rotation axis; 4. The motor unit according to claim 1.

5. the slope member has a flange that protrudes toward the rotation shaft from one of both ends of the peripheral wall in a direction along the rotation shaft, the one being closer to the first space, and surrounds the rotation shaft.

5. The motor unit according to claim 1.

6. the shaft, the rotating member, or the joint connecting the shaft and the rotating member has a first outer circumferential surface surrounded by the flange, a second outer circumferential surface closer to the second space than the first outer circumferential surface, and a third outer circumferential surface connecting the first outer circumferential surface and the second outer circumferential surface and intersecting the first outer circumferential surface and the second outer circumferential surface, The outer diameter of the second outer peripheral surface is shorter than the outer diameter of the first outer peripheral surface. The motor unit according to claim 5.

7. The motor unit of claim 6 , wherein the shaft has the first outer circumferential surface, the second outer circumferential surface, and the third outer circumferential surface.

8. a fifth space communicating with the fourth space is provided in the housing; the motor has an electrode at least partially housed in the fifth space; the slope member is integrally formed with the peripheral wall and has a cover that covers the electrode in the fifth space.

8. A motor unit according to any one of claims 1 to 7.

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