Drive device

Abstract

The utility model provides a driving device. The drive device includes: a motor having a shaft rotatable about a motor axis; a power transmission unit that is connected to the shaft and transmits power of the motor; a housing provided with a gear chamber for housing the power transmission unit; a pump for pumping the fluid in the gear chamber; a temperature sensor that measures the temperature of the fluid; and a control unit that controls the pump on the basis of the measurement results of the temperature sensor. The temperature sensor is disposed inside the pump or in the gear chamber.

Description

Technical Field

[0001] The utility model relates to a driving device. Background Art

[0002] There are known drive devices mounted on vehicles such as electric vehicles and hybrid vehicles. Such drive devices sometimes store fluids such as oil in order to improve the lubricity of gears and cool motors. In addition, there are known structures in which, when a fluid is used to cool a motor, the oil in a housing is supplied to the motor by a pump (for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2013-119918

[0004] Generally speaking, the viscosity of a fluid such as oil depends on the temperature of the fluid. When the temperature of the fluid in the gear housing is significantly low, the viscosity of the fluid increases, and there is a possibility that a load is applied to the mechanism of the pump that pumps the fluid. Utility Model Content

[0005] In view of the above-mentioned problems, one of the objects of the present invention is to provide a driving device capable of reducing the load on a pump.

[0006] The first mode of the utility model provides a driving device, characterized in that the driving device comprises: a motor having a shaft that can rotate around the motor axis; a power transmission part that is connected to the shaft and transmits the power of the motor; a housing that is provided with a gear chamber that accommodates the power transmission part; a pump that pressurizes the fluid in the gear chamber; a temperature sensor that measures the temperature of the fluid; and a control part that controls the pump according to the measurement result of the temperature sensor, and the temperature sensor is arranged either inside the pump or in the gear chamber.

[0007] A drive device according to a second aspect of the present invention is characterized in that, in the drive device according to the first aspect, the temperature sensor is disposed in the gear chamber.

[0008] A driving device according to a third aspect of the present invention is characterized in that, in the driving device according to the second aspect, the housing has a bottom wall portion located below the gear chamber, and the temperature sensor is arranged on an inner side surface of the bottom wall portion.

[0009] A drive device according to a fourth aspect of the present invention is characterized in that, in the drive device according to the second aspect, a recess is provided on an inner wall surface of the housing constituting the gear chamber, and the temperature sensor is arranged inside the recess.

[0010] A driving device according to a fifth aspect of the present invention is characterized in that, in the driving device according to the second aspect, the temperature sensor overlaps with the pump when viewed in the axial direction.

[0011] The driving device of the sixth mode of the present invention is characterized in that, in the driving device of the second mode, the power transmission part is located on one axial side of the motor, and the housing has: a first side wall part, which covers the power transmission part from one axial side; and a second side wall part, which covers the power transmission part from the other axial side, the pump is arranged on one axial side of the first side wall part, and the temperature sensor is arranged on the other axial side of the first side wall part.

[0012] The seventh mode of the driving device of the present invention is characterized in that, in the second mode of the driving device, the power transmission part is located on one axial side of the motor, and the housing has: a first side wall part, which covers the power transmission part from one axial side; and a second side wall part, which covers the power transmission part from the other axial side, the pump is arranged on the other axial side of the second side wall part, and the temperature sensor is arranged on one axial side of the second side wall part.

[0013] The driving device of the eighth mode of the present invention is characterized in that, in the driving device of the first mode, the pump has: a pump motor, which has a pump shaft that can rotate around the pump axis; a mechanism part, which is connected to the pump shaft and pressurizes the fluid; a pump chamber, which accommodates the mechanism part and the fluid; an intake port, which allows the fluid to flow into the pump chamber; and a discharge port, which discharges the fluid from the pump chamber, and the temperature sensor is arranged inside the pump chamber.

[0014] A driving device according to a ninth aspect of the present invention is characterized in that, in the driving device according to the eighth aspect, the temperature sensor is disposed in a path connecting the suction port and the discharge port.

[0015] A driving device according to a tenth aspect of the present invention is characterized in that, in the driving device according to the ninth aspect, the temperature sensor is provided on the suction port side of the path.

[0016] The driving device of the eleventh aspect of the present invention is characterized in that, in the driving device of the eighth aspect, the pump has: a path connecting the suction port and the discharge port; and a detour portion, which is arranged in the pump chamber at a position different from the path, and the temperature sensor is configured in the detour portion.

[0017] The driving device of the twelfth aspect of the present invention is characterized in that, in the driving device of the eighth aspect, the discharge port is arranged radially outside the pump axis relative to the mechanism portion, and the temperature sensor is arranged at a position different from the discharge port in the circumferential direction of the pump axis.

[0018] A driving device according to a thirteenth aspect of the present invention is characterized in that, in the driving device according to the eighth aspect, the temperature sensor is provided at a position that does not overlap with the mechanism portion when viewed in the axial direction of the pump axis.

[0019] A driving device according to a fourteenth aspect of the present invention is characterized in that, in the driving device according to the eighth aspect, a recessed portion recessed in the axial direction is provided on the inner wall surface of the pump chamber, and the temperature sensor is arranged in the recessed portion.

[0020] The driving device of the fifteenth mode of the present utility model is characterized in that, in the driving device of the first mode, the pump comprises: a pump motor having a pump shaft capable of rotating around a pump axis; a mechanism portion connected to the pump shaft for pressurizing the fluid; and a pump chamber that accommodates the mechanism portion, the pump chamber being capable of accommodating the fluid, the pump motor comprising: a rotor portion capable of rotating around the pump axis together with the pump shaft; and a stator portion that surrounds the rotor portion from the radially outer side of the pump axis, and a heat transfer material is sandwiched between the stator portion and the wall portion surrounding the pump chamber.

[0021] A driving device according to a sixteenth aspect of the present invention is characterized in that, in the driving device according to the first aspect, the housing has a pump housing portion for housing the pump, and a heat transfer material is interposed between an inner wall surface of the pump housing portion and the pump.

[0022] According to the utility model, a driving device capable of reducing the load on a pump is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a conceptual diagram of a driving device according to one embodiment.

[0024] Figure 2 It is a front view of the gear chamber of the drive device of one embodiment.

[0025] Figure 3 is a cross-sectional view of a pump according to one embodiment.

[0026] Figure 4 This is a front view of a gear chamber of a drive device according to Modification 1.

[0027] Figure 5 This is a conceptual diagram of a drive device according to Modification 2.

[0028] Figure 6 This is a conceptual diagram of a drive device according to Modification 3.

[0029] Figure 7 It is a cross-sectional view of a pump according to Modification 4.

[0030] Figure 8 It is a cross-sectional view of a pump according to Modification 5.

[0031] Fig. 9 This is a cross-sectional view of a pump according to Modification 6.

[0032] Fig.10 It is a cross-sectional view of a pump according to Modification 7.

[0033] Description of symbols

[0034] 1: driving device; 2: motor; 3: power transmission part; 6: housing; 9, 9A, 9B, 9C, 9D, 9E, 9F, 9G: temperature sensor; 10C: pump chamber; 20: rotor; 21: shaft; 25: stator; 41: gear; 62a: bottom wall; 62b, 89c: recess; 62d: first side wall; 62e: second side wall; 64: pump storage part; 64a: inner wall surface; 70, 370: pump; 70G, 70H: heat transfer material; 71: pump motor; 72: rotor part; 73: stator part; 74: pump shaft; 79: control part; 80: mechanism part; 89a: suction port; 89b: discharge port; 95: path; 96: detour; A2: gear chamber; J: pump axis; J1: motor axis; O: fluid. DETAILED DESCRIPTION

[0035] Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings.

[0036] In the following description, the gravity direction is defined based on the positional relationship when the drive device 1 is mounted on a vehicle located on a horizontal road surface. In addition, in the accompanying drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction represents the vertical direction (i.e., the up and down direction), the +Z direction is the upper side (the opposite side of the gravity direction), and the -Z direction is the lower side (the gravity direction). In addition, the X-axis direction is a direction perpendicular to the Z-axis direction, indicating the front and rear direction of the vehicle equipped with the drive device 1. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction, indicating the width direction (left and right direction) of the vehicle.

[0037] In the following description, unless otherwise specified, the direction parallel to the motor axis J1 (Y-axis direction) is referred to as the "axial direction". In addition, the left side of the vehicle (i.e., the +Y side) is referred to as the one axial direction, and the right side of the vehicle (i.e., the -Y side) is referred to as the other axial direction. Furthermore, the radial direction centered on the motor axis J1 is referred to as the "radial direction", and the circumferential direction centered on the motor axis J1, i.e., the direction around the motor axis J1, is referred to as the "circumferential direction".

[0038] Figure 1 This is a conceptual diagram of the driving device 1 according to the embodiment.

[0039] The drive device 1 drives the vehicle. The drive device 1 is mounted on a vehicle such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV) that uses a motor 2 as a power source, and is used as the power source of the vehicle.

[0040] like Figure 1 As shown, the drive device 1 includes a motor 2, a power transmission unit 3, a fluid O, a pump 70, a cooler 99, a temperature sensor 9, a housing 6, and an inverter 7. The motor 2, the power transmission unit 3, the fluid O, the pump 70, and the temperature sensor 9 are accommodated in the housing 6. The cooler 99 is fixed to the outer side of the housing 6. The inverter 7 supplies power to the motor 2.

[0041] <Motor>

[0042] The motor 2 is accommodated in a motor chamber A1 of the housing 6. The motor 2 includes a rotor 20 and a stator 25 located radially outside the rotor 20. The motor 2 of the present embodiment is an inner rotor type motor.

[0043] The rotor 20 has a shaft 21, a rotor core 24 and a rotor magnet (not shown). That is, the motor 2 has a shaft 21. The rotor 20 can rotate around the motor axis J1. The torque of the rotor 20 is transmitted to the power transmission unit 3. The shaft 21 extends around the motor axis J1. The shaft 21 can rotate around the motor axis J1. The front end of the shaft 21 protrudes into the inner section of the gear chamber A2. A first gear 41 is fixed to the front end of the shaft 21. The power of the motor 2 is transmitted from the first gear 41 to the power transmission unit 3. The rotor core 24 is a roughly cylindrical body extending in the axial direction. A plurality of rotor magnets (not shown) are fixed to the rotor core 24. The plurality of rotor magnets are formed by arranging the magnetic poles alternately in the circumferential direction.

[0044] The stator 25 surrounds the rotor 20 from the radially outer side. The stator 25 has a stator core 27, a coil 26, and an insulator (not shown) between the stator core 27 and the coil 26. The stator 25 is held on the inner side of the housing 6. The stator core 27 has a plurality of teeth (not shown) protruding radially inward from the inner circumference of the annular yoke. Coil wires are arranged between the teeth. The coil wires located between adjacent teeth constitute the coil 26. The insulator is made of an insulating material.

[0045] <Power transmission unit>

[0046] The power transmission unit 3 is accommodated in the gear chamber A2 of the housing 6. The power transmission unit 3 is located on one axial side (+Y side) of the motor 2. The power transmission unit 3 has a plurality of gears 41, 42, 43, and 51. The power transmission unit 3 is connected to the shaft 21 to transmit the power of the motor 2. The power transmission unit 3 has a reduction gear 4 and a differential gear 5.

[0047] The reduction gear 4 reduces the rotation speed of the motor 2 and increases the torque output from the motor 2 according to the reduction ratio. The reduction gear 4 is connected to the shaft 21 of the motor 2. The reduction gear 4 transmits the torque output from the motor 2 to the differential device 5.

[0048] The reduction gear 4 has a first gear 41, an intermediate shaft 45, and a second gear 42 and a third gear 43 fixed to the intermediate shaft 45. The torque output from the motor 2 is transmitted to the ring gear 51 of the differential device 5 via the shaft 21 of the motor 2, the first gear 41, the second gear 42 and the third gear 43. That is, the second gear 42 and the third gear 43 transmit the power of the first gear 41 to the ring gear 51. The gear ratio of each gear and the number of gears can be changed in various ways according to the required reduction ratio. The reduction gear 4 of this embodiment is a parallel axis gear type reducer in which the rotation center of each gear is arranged in parallel.

[0049] The first gear 41 is fixed to the outer peripheral surface of the shaft 21 of the motor 2. The first gear 41 rotates together with the shaft 21 about the motor axis J1. The intermediate shaft 45 extends along the intermediate axis J2 parallel to the motor axis J1. The intermediate shaft 45 rotates about the intermediate axis J2. The second gear 42 and the third gear 43 are arranged in an axial direction. The second gear 42 and the third gear 43 are arranged on the outer peripheral surface of the intermediate shaft 45. The second gear 42 and the third gear 43 are connected via the intermediate shaft 45. The second gear 42 and the third gear 43 rotate about the intermediate axis J2. At least two of the second gear 42, the third gear 43 and the intermediate shaft 45 can also be composed of one component. The second gear 42 meshes with the first gear 41. The third gear 43 meshes with the ring gear 51 of the differential device 5.

[0050] The differential device 5 transmits the torque generated by the motor 2 to the wheels of the vehicle. When the vehicle turns, the differential device 5 transmits the same torque to the pair of output shafts 55 while absorbing the speed difference between the left and right wheels.

[0051] The differential device 5 has a ring gear 51. The ring gear 51 rotates around a differential axis J3 parallel to the motor axis J1. The torque output from the motor 2 is transmitted to the ring gear 51 via the reduction gear 4. In addition, the power transmitted to the ring gear 51 is transmitted to the output shaft 55 via the differential mechanism of the differential device 5. The output shaft 55 extends in the axial direction. A pair of output shafts 55 are connected to the differential device 5. A wheel is connected to one end of each output shaft. The output shaft 55 transmits the torque of the motor 2 to the road surface via the wheel.

[0052] In the power transmission unit 3, the motor axis J1, the intermediate axis J2 and the differential axis J3 extend in the axial direction. The motor axis J1 is located above the differential axis J3 and the intermediate axis J2. The differential axis J3 and the intermediate axis J2 are arranged side by side in the horizontal direction.

[0053] <Casing>

[0054] The housing 6 has a housing body 6a, a motor cover 6b, and a gear cover 6c. In the present embodiment, the housing body 6a, the motor cover 6b, and the gear cover 6c are different components. The motor cover 6b is arranged on the other axial side (-Y side) of the housing body 6a. The gear cover 6c is arranged on one axial side (+Y side) of the housing body 6a.

[0055] The housing 6 has a gear housing portion 62 that houses the power transmission portion 3, a motor housing portion 61 that houses the motor 2, and a pump housing portion 64 that houses the pump 70. The motor housing portion 61 and the gear housing portion 62 of the present embodiment are composed of the housing body 6a, the motor cover 6b, and the gear cover 6c. The pump housing portion 64 is provided in the housing body 6a.

[0056] The gear housing portion 62 is composed of a concave portion 6d opened on one axial side (+Y side) of the housing body 6a and a gear cover 6c covering the opening of the concave portion 6d. The power transmission unit 3 is arranged in the gear chamber A2 surrounded by the housing body 6a and the gear cover 6c.

[0057] The gear storage portion 62 includes a first side wall portion 62d located on one axial side (+Y side) of the gear chamber A2, a second side wall portion 62e located on the other axial side (-Y side) of the gear chamber A2, and a bottom wall portion 62a located on the lower side of the gear chamber A2. The housing 6 includes a first side wall portion 62d, a second side wall portion 62e, and a bottom wall portion 62a.

[0058] The first side wall portion 62d and the second side wall portion 62e are respectively in the shape of a plate extending perpendicularly to the axial direction. The first side wall portion 62d and the second side wall portion 62e are opposite to each other in the axial direction. The first side wall portion 62d covers the power transmission portion 3 from one axial side (+Y side). The first side wall portion 62d is a part of the gear cover 6c. The second side wall portion 62e covers the power transmission portion 3 from the other axial side (-Y side).

[0059] The bottom wall portion 62a covers the power transmission unit 3 from the bottom. The bottom wall portion 62a is provided with a recessed portion 62b that is recessed downward. That is, the recessed portion 62b is provided on the inner wall surface of the housing 6 constituting the gear chamber A2. The fluid O is accumulated inside the gear housing portion 62 and on the upper side of the bottom wall portion 62a.

[0060] The motor housing portion 61 is arranged on the other axial side (-Y side) of the gear housing portion 62. The motor housing portion 61 is composed of a cylindrical portion 6e of the housing body 6a and a motor cover 6b covering an opening on the other axial side (-Y side) of the cylindrical portion 6e. The motor 2 is arranged in a space surrounded by the housing body 6a and the motor cover 6b.

[0061] The pump housing portion 64 is arranged on the radially outer side of the motor housing portion 61. In addition, the pump housing portion 64 is arranged on the other axial side (-Y side) of the gear housing portion 62. In the present embodiment, the pump housing portion 64 is roughly cylindrical and surrounds the pump axis J. In addition, the shape of the pump housing portion 64 may be roughly square cylindrical or other shapes in addition to being roughly cylindrical. The pump housing portion 64 opens on the other axial side (-Y side). The pump 70 is accommodated in the internal space of the pump housing portion 64 and the fluid O enters. The opening on the other axial side (-Y side) of the pump housing portion 64 is covered by the flange portion 13b of the pump 70. The opening on one axial side (+Y side) of the pump housing portion 64 is covered by the second side wall portion 62e. A through hole 61h is provided in the second side wall portion 62e to connect the gear chamber A2 with the internal space of the pump housing portion 64. The through hole 61h penetrates the second side wall portion 62e in the axial direction. The through hole 61h opens to the reservoir P storing the fluid O in the gear chamber A2. The pump 70 sucks the fluid O in the reservoir P through the through hole 61h.

[0062] The housing body 6a has a partition wall 65 that divides the motor chamber A1 and the gear chamber A2. The partition wall 65 of the present embodiment is arranged on the same plane as the second side wall portion 62e. The partition wall 65 of the present embodiment is formed integrally with the second side wall portion 62e. The partition wall 65 is provided with a shaft insertion hole 65b and a partition wall opening 65a. The shaft insertion hole 65b and the partition wall opening 65a connect the motor chamber A1 and the gear chamber A2. The shaft 21 is inserted through the shaft insertion hole 65b. The partition wall opening 65a is provided near the bottom of the motor storage portion 61.

[0063] Figure 2 This is a front view of the gear chamber A2.

[0064] A storage portion P is provided in the lower area of ​​the gear chamber A2. Fluid O is accumulated in the storage portion P. The fluid O accumulated in the storage portion P is lifted up by the action of the power transmission portion 3. A portion of the lifted fluid O is scattered into the internal space of the gear chamber A2. At least a portion of the ring gear 51 is immersed in the storage portion P of the present embodiment. The power transmission portion 3 lifts the fluid O in the ring gear 51. The fluid O scattered into the gear chamber A2 is supplied to each gear of the power transmission portion 3 so that the fluid O is spread over the tooth surfaces of the gears. The fluid O supplied to the power transmission portion 3 and used for lubrication drips and is accumulated in the storage portion P.

[0065] <Fluid>

[0066] The fluid O is used, for example, for lubrication of the power transmission unit 3. In addition, the fluid O is used, for example, for cooling the motor 2. The fluid O is stored in the reservoir P. That is, the fluid O is stored in the gear chamber A2. In order to exert the functions of lubricating oil and cooling oil, the fluid O is preferably a lubricating oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) having a relatively low viscosity.

[0067] like Figure 1 As shown, the fluid O circulates in the flow path 90 in the driving device 1. The flow path 90 is a path for the fluid O to flow, and is connected from the reservoir P to the motor 2. In addition, in this specification, the "flow path" refers to the path of the fluid O that circulates in the housing 6. Therefore, the "flow path" is a concept that includes not only a "flow path" that forms a stable flow of the fluid O stably in one direction, but also a path that temporarily retains the fluid O (for example, a path that functions as a reservoir) and a path for the fluid O to drip.

[0068] The flow path 90 is provided with a pump 70 and a cooler 99. The cooler 99 cools the fluid O in the flow path 90. An internal flow path (not shown) through which the fluid O flows and an internal flow path (not shown) through which cooling water supplied from a radiator (not shown) flows are provided inside the cooler 99. Heat is exchanged between the fluid O and the cooling water inside the cooler 99.

[0069] The flow path 90 passes through the pump 70 and the cooler 99. The flow path 90 is branched into a first flow path portion 91 and a second flow path portion 92 on the downstream side of the cooler 99. The first flow path portion 91 passes through the inside of the shaft 21. A flow path for the fluid O to pass through is formed inside the rotor 20. The fluid O in the first flow path portion 91 flows from a through hole penetrating the outer wall of the shaft 21 to the flow path inside the rotor 20. The fluid O flowing inside the rotor 20 is scattered radially inward by the centrifugal force accompanying the rotation of the rotor 20 and is provided to the stator 25. In addition, the second flow path portion 92 extends to the top of the motor 2 through the inside of the housing 6, for example. The fluid O of the second flow path portion 92 is provided from the upper side of the motor 2, and cools the motor 2 while flowing along the surface of the motor 2. In addition, the fluid O drips from the motor 2 and reaches the lower area of ​​the motor chamber A1. The fluid O returns to the storage portion P through the partition wall opening 65a of the partition wall 65 provided between the motor chamber A1 and the gear chamber A2. According to the present embodiment, the motor 2 can be cooled by supplying the fluid O to the motor 2 through the flow path 90 , and the temperature of the motor 2 can be suppressed from becoming excessively high.

[0070] <Temperature sensor>

[0071] The temperature sensor 9 is, for example, a thermistor. The temperature sensor 9 of the present embodiment is disposed in the storage portion P of the gear chamber A2. More specifically, the temperature sensor 9 is disposed on the inner side surface of the bottom wall portion 62a of the gear storage portion 62. A recess 62b recessed downward is provided on the inner side surface of the gear chamber A2. In the present embodiment, the recess 62b is provided in the bottom wall portion 62a of the inner side surface of the gear chamber A2. That is, the temperature sensor 9 is disposed inside the recess 62b provided on the inner side surface of the gear chamber A2. The temperature sensor 9 measures the temperature of the fluid O accumulated in the storage portion P. The temperature sensor 9 is connected to the control unit 79 of the pump 70 described later. The temperature sensor 9 sends the measurement result of the temperature of the fluid O to the control unit 79. In addition, the temperature sensor 9 may also be connected to the inverter 7 that controls the drive of the drive device 1.

[0072] As described above, the fluid O is accumulated in the reservoir P, that is, on the upper side of the bottom wall portion 62a inside the gear housing portion 62. Therefore, even when the level of the fluid O accumulated in the gear chamber A2 is low, the temperature sensor 9 can easily contact the fluid O, and the accuracy of the temperature sensor 9 measuring the temperature of the fluid O can be improved.

[0073] The fluid O stored in the gear chamber A2 is stirred by the rotation of the ring gear 51. However, according to the present embodiment, by arranging the temperature sensor 9 in the recess 62b, the temperature sensor 9 can be arranged away from the stirred fluid O, thereby preventing the temperature sensor 9 from being damaged.

[0074] In addition, as described above, the recessed portion 62b is provided in the bottom wall portion 62a. The recessed portion 62b is recessed downward, so that the fluid O in the gear housing portion 62 easily flows into the recessed portion 62b. Therefore, even if the liquid level of the gear chamber A2 changes or the drive device 1 tilts, the inside of the recessed portion 62b is easily filled with the fluid O. Since the temperature sensor 9 is easily brought into contact with the fluid O, the temperature of the fluid O can be measured even if there is a change in the liquid level or the drive device 1 tilts.

[0075] <Pump 70>

[0076] Figure 3 It is a cross-sectional view of the pump 70 according to the present embodiment.

[0077] In this embodiment, the pump 70 is an electric pump driven by electricity. The pump 70 presses the fluid O in the gear chamber A2. The pump 70 includes a pump housing 10, a pump motor 71, a mechanism 80, and a control unit 79. That is, the drive device 1 (see Figure 1 ) has a control unit 79. The pump 70 has a pump shaft 74 that can rotate around a pump axis J.

[0078] In the following description, the direction in which the pump axis J extends is referred to as the pump axial direction D, and the arrangement of the various parts of the pump 70 is described. Figure 3 The direction (+D side) pointed by the arrow of the pump axial direction D shown is called the pump axial one side, and the opposite side is called the pump axial other side (-D side). Figure 1 The -Y side of the pump shaft corresponds to the -D side. Figure 1 However, the posture of the pump 70 in the drive device 1 is not limited to this embodiment, and the pump axial direction D may also be Figure 1 The direction in which the Y axis crosses.

[0079] A control section chamber 10A for accommodating the control section 79, a pump motor chamber 10B for accommodating the pump motor 71, and a pump chamber 10C for accommodating the mechanism section 80 are provided inside the pump housing 10. That is, the pump housing 10 accommodates the control section 79, the pump motor 71, and the mechanism section 80. In other words, the pump 70 has the control section chamber 10A, the pump motor chamber 10B, and the pump chamber 10C. In addition, when the pump 70 is driven, the fluid O enters the pump chamber 10C. In other words, when the pump 70 is driven, the pump chamber 10C can accommodate the fluid O. The pump housing 10 can accommodate the fluid O.

[0080] The pump housing 10 includes a cover 11, a first housing 12, a housing body 13, and a second housing 14. The cover 11, the first housing 12, the housing body 13, and the second housing 14 are assembled in this order along the axial direction D of the pump.

[0081] In the present embodiment, the housing body 13 is made of metal. The housing body 13 includes a first cylinder 13a, a flange 13b, a second cylinder 13c, a bearing holding cylinder 13d, and a bottom plate 13e. In the present embodiment, the above-mentioned parts 13a to 13e of the pump housing 10 are composed of one component. In addition, at least one of the above-mentioned parts 13a to 13e may also be composed of a separate body. In addition, the housing body 13 may also be composed of a material other than metal.

[0082] In the present embodiment, the first barrel portion 13a is in a generally cylindrical shape extending along the pump axial direction D. The internal space of the first barrel portion 13a constitutes the pump motor chamber 10B. The flange portion 13b protrudes radially outward from the end of the first barrel portion 13a on one side (+D side) of the pump axial direction. In the present embodiment, when viewed from the pump axis direction, the flange portion 13b is in a generally annular shape. The first housing portion 12 is fixed to the flange portion 13b. In addition, the shapes of the first barrel portion 13a and the flange portion 13b are not limited to the above-mentioned shapes, and may also be other shapes.

[0083] The outer peripheral surface of the stator portion 73 of the pump motor 71 described later contacts the inner peripheral surface of the first cylinder portion 13a. The heat of the stator portion 73 is transferred to the first cylinder portion 13a. In addition, as described above, the pump 70 is arranged inside the pump housing portion 64 of the housing 6. The outer peripheral surface of the first cylinder portion 13a is opposite to the inner wall surface 64a of the pump housing portion 64 in the radial direction of the pump axis J.

[0084] A heat transfer material 70H is sandwiched between the inner wall surface 64a of the pump housing 64 and the pump 70. More preferably, the heat transfer material 70H is filled between the outer peripheral surface of the first barrel 13a and the inner wall surface 64a of the pump housing 64. The heat transfer material 70H transfers the heat of the pump motor 71 to the housing 6. Thus, the heat of the pump motor 71 can be conducted to the fluid O in the housing 6. Therefore, the temperature of the fluid O in the housing 6 (for example, the fluid O in the gear chamber A2) rises, and the viscosity of the fluid O can be reduced. Therefore, the load applied to the pump 70 that sucks in the fluid O can be suppressed. In addition, as the heat transfer material 70H, for example, a grease with high thermal conductivity such as heat dissipation grease can be used. In addition, the heat transfer material 70H can also be a solid material.

[0085] The second cylinder 13c is located on the other side (-D side) of the first cylinder 13a in the pump axial direction. The second cylinder 13c is in the shape of a cylinder extending along the pump axial direction D with the pump axis J as the center. The internal space of the second cylinder 13c constitutes the pump chamber 10C. The second cylinder 13c is located on the other side (-D side) of the first cylinder 13a in the pump axial direction.

[0086] The bottom plate portion 13e is disposed between the first cylinder portion 13a and the second cylinder portion 13c. The bottom plate portion 13e is in the shape of a plate perpendicular to the pump axis J. The bottom plate portion 13e closes the opening of the first cylinder portion 13a on the other side (-D side) of the pump axis, and closes the opening of the second cylinder portion 13c on one side (+D side) of the pump axis. That is, the bottom plate portion 13e divides the pump motor chamber 10B and the pump chamber 10C.

[0087] The bearing holding cylinder 13d is connected to the surface of the bottom plate 13e facing one side (+D side) in the pump axial direction. The holding recess 13f, the second suction side groove 87b and the second discharge side groove 88b are provided on the surface of the bottom plate 13e facing the other side (-D side) in the pump axial direction.

[0088] The holding recess 13f holds the mechanism portion 80. The holding recess 13f opens on the other side (-D side) in the pump axial direction. The holding recess 13f has a substantially circular shape that is eccentric with respect to the pump axis J when viewed from the pump axial direction D.

[0089] The second suction side groove portion 87b and the second discharge side groove portion 88b are respectively in the shape of grooves extending in the circumferential direction of the pump axis J. The second suction side groove portion 87b and the second discharge side groove portion 88b are open on the other side (-D side) of the pump axis. The second suction side groove portion 87b and the second discharge side groove portion 88b are arranged at different positions in the circumferential direction. The second suction side groove portion 87b and the second discharge side groove portion 88b are arranged on opposite sides across the pump axis J.

[0090] The bearing holding cylinder 13d is arranged inside the first cylinder 13a. The bearing holding cylinder 13d is in a cylindrical shape centered on the pump axis J. The bearing holding cylinder 13d holds the second bearing 70B and the sealing member 70C. The second bearing 70B rotatably supports the pump shaft 74. The sealing member 70C contacts the outer peripheral surface of the pump shaft 74.

[0091] The second housing portion 14 is fixed to the end portion of the pump housing 10 on the other side (-D side) of the pump axial direction, and covers the mechanism portion 80 from the other side (-D side) of the pump axial direction. The second housing portion 14 is provided with an external connection portion 14a protruding to the other side (-D side) of the pump axial direction. The external connection portion 14a is inserted into the through hole 61h of the housing 6.

[0092] The first suction-side groove portion 87a, the first discharge-side groove portion 88a, the suction port 89a, and the discharge port 89b are provided in the second housing portion 14. That is, the pump 70 has the suction port 89a and the discharge port 89b.

[0093] The first suction side groove portion 87a and the first discharge side groove portion 88a are arranged on the surface of the second housing portion 14 facing the pump axial side (+D side). The first suction side groove portion 87a and the first discharge side groove portion 88a are respectively in the shape of grooves extending in the circumferential direction of the pump axis J. The first suction side groove portion 87a and the first discharge side groove portion 88a are open on the pump axial side (+D side). The first suction side groove portion 87a and the first discharge side groove portion 88a are arranged at different positions in the circumferential direction. In the present embodiment, the first suction side groove portion 87a and the first discharge side groove portion 88a are arranged on opposite sides across the pump axis J.

[0094] The first suction-side groove portion 87a overlaps with the second suction-side groove portion 87b when viewed from the pump axial direction D. Similarly, the first discharge-side groove portion 88a overlaps with the second discharge-side groove portion 88b when viewed from the pump axial direction D. In addition, the first suction-side groove portion 87a, the second suction-side groove portion 87b, the first discharge-side groove portion 88a, and the second discharge-side groove portion 88b are part of the pump chamber 10C.

[0095] The suction port 89a sucks the fluid O from the outside of the pump 70. The suction port 89a allows the fluid O to flow into the pump chamber 10C. The suction port 89a extends from the first suction side groove portion 87a to the other side (-D side) of the pump axis. The suction port 89a opens at the end surface of the external connection portion 14a on the other side (-D side) of the pump axis. The fluid O sucked into the pump chamber 10C is compressed by the mechanism portion 80.

[0096] The discharge port 89b discharges the compressed fluid O to the outside of the pump 70. The discharge port 89b discharges the fluid O from the pump chamber 10C. The discharge port 89b extends from the first discharge-side groove portion 88a to the radially outer side of the pump axis J. The suction port 89a opens at the outer peripheral surface of the second cylinder portion 13c. The discharge port 89b is arranged radially outward of the pump axis J relative to the mechanism portion 80.

[0097] The first housing portion 12 is fixed to the end surface of the pump housing 10 on one axial side (+D side). A substrate storage recess 12a constituting the control unit chamber 10A is provided on the surface of the first housing portion 12 facing the one axial side (+D side). In addition, a plurality of bosses 12b for supporting the control unit 79 are provided on the bottom surface of the substrate storage recess 12a. The first housing portion 12 supports the control unit 79 in the plurality of bosses 12b. The opening of the substrate storage recess 12a is covered by the cover portion 11.

[0098] The first housing portion 12 has a bearing holding portion 12c. In the present embodiment, the bearing holding portion 12c is substantially cylindrical and extends in the pump axial direction D. The bearing holding portion 12c holds a first bearing 70A. The first bearing 70A rotatably supports the shaft 21. The first bearing 70A and the second bearing 70B are, for example, ball bearings.

[0099] The pump motor 71 includes a pump shaft 74 rotatable about a pump axis J, a rotor 72 rotatable together with the pump shaft 74 about the pump axis J, and a stator 73 surrounding the rotor 72 from the radially outer side of the pump axis J. The pump motor 71 of the present embodiment is an AC motor.

[0100] The rotor portion 72 includes a rotor core 72a and a plurality of magnets 72b. The rotor core 72a is fixed to the pump shaft 74. The plurality of magnets 72b are fixed to the rotor core 72a. The pump shaft 74 is supported by the first bearing 70A and the second bearing 70B so as to be rotatable around the pump axis J. The rotor core 72a is located between the first bearing 70A and the second bearing 70B. The rotor core 72a is in the shape of a ring extending circumferentially with the pump axis J as the center. In the present embodiment, the plurality of magnets 72b are arranged on the radially outer side of the rotor core 72a. In addition, the plurality of magnets 72b may also be retained inside the rotor core 72a.

[0101] The stator portion 73 and the rotor portion 72 are opposed to each other with a gap in the radial direction. The stator portion 73 has a stator core 73a, an insulator 73e and a plurality of coils 73d. The stator core 73a has an annular core back 73c centered on the pump axis J and a plurality of teeth 73b extending radially inward from the inner circumferential end of the core back 73c. ​​The radial outer side surface of the core back 73c is fixed to the inner circumferential surface of the first cylinder 13a. The plurality of teeth 73b are arranged at intervals from each other along the circumferential direction on the radial inner side surface of the core back 73c. ​​The insulator 73e is mounted on the teeth of the stator core 73a. The material of the insulator 73e is, for example, an insulating resin. The coil 73d is mounted on the stator core 73a via the insulator 73e. The plurality of coils 73d are respectively formed by, for example, winding a conducting wire around each tooth via the insulator 73e. An end portion of the conductive wire constituting the coil 73 d is led out to one side (+D side) in the pump axial direction of the stator portion 73 , and is connected to the control unit 79 .

[0102] A bottom plate portion 13e that divides the pump motor chamber 10B and the pump chamber 10C is arranged on the other side (-D side) of the stator portion 73 in the pump axial direction. The stator portion 73 and the bottom plate portion 13e are opposed to each other in the pump axial direction D. The heat transfer material 70G is between the stator portion 73 and the bottom plate portion 13e. More preferably, the heat transfer material 70G is filled between the stator portion 73 and the bottom plate portion 13e. That is, the heat transfer material 70G is sandwiched between the stator portion 73 and the wall portion (bottom plate portion 13e) surrounding the pump chamber 10C. The heat transfer material 70G is preferably in contact with the coil 73d in the stator portion 73, where the temperature is most likely to rise.

[0103] The heat transfer material 70G transfers the heat of the stator portion 73 to the fluid O in the pump chamber 10C via the bottom plate portion 13e. As a result, the heat of the stator portion 73 can be effectively released to the fluid O in the pump chamber 10C, thereby transferring the heat of the stator portion to the fluid O, thereby increasing the temperature of the fluid O and reducing the viscosity of the fluid O, thereby suppressing the load applied to the mechanism portion 80 of the pump 70 that pressurizes the fluid O. In addition, as the heat transfer material 70G, an insulating material is preferably used, for example, a grease with high thermal conductivity such as heat dissipation grease can be used. In addition, the heat transfer material 70G can also be a solid material. The heat transfer material 70G can be composed of the same type of material as the above-mentioned heat transfer material 70H, or it can be composed of a different type of material.

[0104] The mechanism part 80 is connected to the pump shaft 74. The mechanism part 80 is driven by the power of the pump motor 71. The mechanism part 80 sucks the fluid O from the outside as the pump motor 71 is driven. The mechanism part 80 discharges the sucked fluid O as the pump motor 71 is driven. That is, the mechanism part 80 pressurizes the fluid O.

[0105] The pump 70 having the mechanism portion 80 of the present embodiment is a trochoid pump. The mechanism portion 80 has an inner rotor 81 and an outer rotor 82. The outer rotor 82 is arranged on the radially outer side of the inner rotor 81. The inner rotor 81 and the outer rotor 82 each have a trochoid tooth profile. The tooth profile of the inner rotor 81 meshes with the tooth profile of the outer rotor 82 at one position in the circumferential direction. The outer rotor 82 is held on the inner side surface of the retaining recess 13f. The outer rotor 82 surrounds the inner rotor 81 from the radially outer side over the entire circumference in the circumferential direction. The inner rotor 81 is connected to the end of the pump shaft 74 on the other side (-D side) of the pump shaft toward the pump axis J. The inner rotor 81 rotates integrally with the pump shaft 74 around the pump axis J on the radially inner side of the outer rotor 82. The outer rotor 82 rotates eccentrically around the pump axis J while sliding on the inner circumferential surface of the retaining recess 13f.

[0106] The first suction side groove 87a and the second suction side groove 87b are connected to the gap G between the inner rotor 81 and the outer rotor 82 from both sides in the pump axial direction. Similarly, the first discharge side groove 88a and the second discharge side groove 88b are connected to the gap G between the inner rotor 81 and the outer rotor 82 from both sides in the pump axial direction.

[0107] The mechanism 80 is driven to move the gap G provided between the inner rotor 81 and the outer rotor 82 around the pump axis J. In addition, the fluid O flows into the gap G. The mechanism 80 moves the fluid O from the first suction side groove 87a and the second suction side groove 87b to the first discharge side groove 88a and the second discharge side groove 88b by the gap G moving in the circumferential direction. Thus, the pump 70 inhales the fluid O from the suction port 89a and discharges the fluid O from the discharge port 89b.

[0108] The pump 70 has a path 95 connecting the suction port 89a and the discharge port 89b. The path 95 has a first path portion 95a from the suction port 89a to the pump chamber 10C, a second path portion 95b via the mechanism portion 80 in the pump chamber 10C, and a third path portion 95c from the pump chamber 10C to the discharge port 89b. When the pump 70 pressurizes the fluid O in a drive mode described later, the fluid O flows in the third path portion 95c.

[0109] In addition, the pump 70 has a detour 96 disposed in the pump chamber 10C at a position different from the path 95. The detour 96 is disposed radially outside the mechanism portion 80 and at a position different from the discharge port 89b in the circumferential direction. The fluid O enters the detour 96. Regardless of whether the mechanism portion 80 is driven, the fluid O in the detour 96 is easily retained. That is, even when the pump 70 is pressurizing the fluid O in the drive mode described later, the flow of the fluid O in the detour 96 is relatively gentle.

[0110] <Control Department>

[0111] The control unit 79 is located on one side (+D side) of the pump axis of the pump motor 71. The control unit 79 has a control substrate 79a arranged perpendicular to the pump axis J. In the present embodiment, the control substrate 79a is plate-shaped. On the control substrate 79a, for example, a control IC for driving and controlling the pump motor 71, an inverter for the pump motor, and a power supply circuit are mounted. In addition, in the present embodiment, the case where the control unit 79 is arranged inside the pump motor 71 is described. However, the control unit 79 may also be arranged outside the pump motor 71. As an example, the control unit 79 may also be arranged in the inverter 7.

[0112] The control unit 79 is connected to the pump motor 71 and the temperature sensor 9. The control unit 79 switches the control mode of the pump 70 according to the temperature of the fluid O measured by the temperature sensor 9. The control unit 79 of this embodiment can switch between two control modes: a heating mode and a driving mode.

[0113] The control unit 79 that has selected the drive mode drives the pump 70 efficiently. More specifically, the drive mode is a mode in which the pump motor 71 generates torque to rotate the mechanism unit 80. When the control mode of the pump 70 is switched to the drive mode, the control unit 79 causes an alternating current of an amplitude and phase that most efficiently outputs the torque required to drive the mechanism unit 80 to flow through the coil 73d of the stator unit 73.

[0114] The control unit 79 that has selected the heating mode causes the pump motor 71 to actively generate heat. More specifically, the heating mode is a mode in which the pump motor 71 does not generate torque and does not drive the mechanism unit 80. When the control mode of the pump 70 is switched to the heating mode, the control unit 79 causes, for example, a constant direct current to flow through the coil 73d of the stator unit 73, thereby causing the coil 73d to generate heat. The pump motor 71 of this embodiment is an AC motor, so the rotor unit 72 cannot be rotated even if a direct current flows.

[0115] When the pump 70 is driven in either the heating mode or the driving mode, the stator portion 73 generates heat. The heating mode is a mode in which electrical energy that is not converted into kinetic energy is excessively supplied to the stator portion 73, and the excessively supplied electrical energy is converted into thermal energy, thereby actively generating heat in the motor 2. In the heating mode of the present embodiment, substantially all of the electrical energy supplied to the motor 2 is converted into thermal energy. Therefore, when the control unit 79 selects the heating mode, the heat generated by the stator portion 73 is greater than when the driving mode is selected.

[0116] The control unit 79 controls the pump 70 based on the measurement result of the temperature sensor 9. The control unit 79 selects the heating mode when the measurement result of the temperature sensor 9 is lower than the threshold value T. The control unit 79 that has selected the heating mode causes the pump motor 71 to actively generate heat. Therefore, when the control unit 79 that has selected the heating mode causes current to flow through the pump 70, the stator unit 73 of the pump 70 generates heat without pressurizing the fluid O. The heat of the stator unit 73 is transferred to the fluid O, causing the temperature of the fluid O to rise. In addition, as the temperature of the fluid O rises, the viscosity of the fluid O decreases. When the control unit 79 continues to cause current to flow through the pump 70 controlled in the heating mode, the temperature of the fluid O eventually exceeds the threshold value T.

[0117] The control unit 79 selects a drive mode when the measurement result of the temperature sensor 9 is greater than the threshold value T. The control unit 79 that has selected the drive mode effectively drives the pump 70. That is, the control unit 79 drives the pump motor 71 to operate the mechanism unit 80. Since the viscosity of the fluid O that is greater than the threshold value T is sufficiently reduced, the mechanism unit 80 can smoothly pressurize and deliver the fluid O.

[0118] The viscosity of the fluid O depends on the temperature of the fluid O. When the temperature decreases, the viscosity of the fluid O increases. When the pump 70 attempts to suck the highly viscous fluid O, a load is applied to the mechanism 80 of the pump 70, which may shorten the service life of the mechanism 80.

[0119] According to the present embodiment, the control unit 79 controls the pump 70 based on the measurement result of the temperature sensor 9. Therefore, when the temperature of the fluid O is low, the stator unit 73 is actively heated, and the heat generated by the stator unit 73 is transferred to the fluid O, thereby increasing the temperature of the fluid O and reducing the viscosity of the fluid O. In addition, by pressurizing the fluid O by the mechanism unit 80 after reducing the viscosity of the fluid O, it is possible to suppress the load on the mechanism unit 80.

[0120] Furthermore, according to the present embodiment, the control unit 79 selects a control mode (the aforementioned heating mode) that effectively increases the temperature of the fluid O based on the measurement result of the temperature sensor 9, thereby making it possible to quickly increase the temperature of the fluid O compared to a case where the heating mode is not selected. Therefore, even when the temperature of the fluid O is low, the pump 70 is driven, and compared to a case where the fluid O is heated by the heat during driving, the time required for the pump 70 to stably pump the fluid O can be shortened.

[0121] like Figure 1 As shown, the temperature sensor 9 of this embodiment is arranged in the gear chamber A2. In this embodiment, the pump 70 sucks the fluid O from the gear chamber A2, so the temperature sensor 9 of this embodiment can measure the fluid O before being sucked into the mechanism part 80 of the pump 70. Therefore, the temperature of the fluid O sucked into the mechanism part 80 can be accurately measured.

[0122] According to the present embodiment, the temperature sensor 9 is arranged in the gear chamber A2. Therefore, the temperature sensor 9 is arranged separately from the stator portion 73 which is a heat generating portion of the pump 70. In addition, the temperature sensor 9 and the stator portion 73 can be arranged in different spaces separated by the second side wall portion 62e. Therefore, for example, compared with the case where the temperature sensor 9 is arranged in the pump 70, the measurement result of the temperature sensor 9 is not easily affected by the heat generated by the stator portion 73, and the measurement accuracy of the temperature of the fluid O can be improved.

[0123] In addition, in the present embodiment, the case where the temperature sensor 9 is arranged in the gear chamber A2 is described. However, as described in the modified example in the latter section, the same effect can be obtained even when the temperature sensor is arranged inside the pump 70. That is, if the temperature sensor 9 is arranged in either the inside of the pump 70 or the gear chamber A2, the effect of accurately measuring the temperature of the fluid O sucked into the mechanism portion 80 can be obtained.

[0124] <Modification>

[0125] Hereinafter, the modified examples of the above-mentioned embodiment will be described. In the description of each modified example below, for the same structure as the above-mentioned embodiment, the description is sometimes omitted by appropriately marking the same reference numerals, etc. In addition, as the structure whose description is omitted in each modified example below, the same structure as the first embodiment above can be adopted within the scope of no contradiction.

[0126] (Variant 1)

[0127] like Figure 4 As shown, the temperature sensor 9A may also be configured to overlap with the pump 70 when viewed from the axial direction. In this case, the temperature sensor 9A can be configured in the gear chamber A2 so as to be close to the suction port 89a of the pump 70. The temperature sensor 9A can measure the fluid O before being sucked into the mechanism 80 of the pump 70. In addition, it is also possible that, when viewed from the axial direction, the temperature sensor 9A and the suction port 89a of the pump 70 are located, for example, on the lower side of the motor 2. It is also possible that, when viewed from the axial direction, the temperature sensor 9A and the suction port 89a of the pump 70 are located on the lower side of at least any one of the first gear 41, the second gear 42, and the ring gear 51. It is also possible that, when viewed from the axial direction, the temperature sensor 9A and the suction port 89a of the pump 70 are configured to overlap with at least any one of the first gear 41, the second gear 42, and the ring gear 51 in the axial direction.

[0128] (Variant 2)

[0129] like Figure 5As shown, the temperature sensor 9B may also be arranged on one axial side (+Y side) of the second side wall portion 62e. In addition, in this case, the pump 70 is arranged on the other axial side (-Y side) of the second side wall portion 62e in the same manner as in the above-mentioned embodiment. According to this modified example, the temperature sensor 9B can be arranged close to the suction port 89a of the pump 70 in the gear chamber A2. In addition, the distance between the temperature sensor 9B and the pump 70 is shortened, so the wiring of the temperature sensor 9B and the control unit 79 of the pump 70 can be shortened. In addition, in the case where the temperature sensor 9B is provided on the second side wall portion 62e, a recessed portion recessed toward the other axial side (-Y side) may also be provided on the second side wall portion 62e. The temperature sensor 9B is arranged in the recess. The temperature sensor 9B may also be arranged at the boundary between the bottom wall portion 62a and the second side wall portion 62e. In the case where the temperature sensor 9B is provided on the second side wall portion 62e, it is preferred that at least a portion of the temperature sensor 9B is located at a position axially lower than the partition wall opening 65a. Thus, the temperature sensor 9B can easily measure the temperature of the fluid O. The temperature sensor 9B may or may not overlap with at least one of the first gear 41 , the second gear 42 , and the ring gear 51 in the axial direction.

[0130] (Variant 3)

[0131] like Figure 6 As shown, the pump 370 may be arranged on one axial side (+Y side) of the first side wall portion 62d, and the temperature sensor 9C may be arranged on the other axial side (-Y side) of the first side wall portion 62d. In this case, it is preferred that a portion of the flow path 90 is arranged along the first side wall portion 62d. And, according to this modification, the temperature sensor 9C can be arranged close to the suction port 89a of the pump 370 in the gear chamber A2. In addition, when the pump 370 is arranged on one axial side (+Y side) of the first side wall portion 62d, the through hole 362h connecting the pump 370 and the gear storage portion 62 is provided in the first side wall portion 62d. When viewed from the axial direction, the through hole 362h may also be arranged to overlap with the ring gear 51 in the axial direction. The temperature sensor 9C may overlap with at least one of the first gear 41, the second gear 42, and the ring gear 51 in the axial direction, or it may not overlap. When the temperature sensor 9C is provided on the other axial side (-Y side) of the first side wall portion 62d, a recessed portion recessed toward one axial side (+Y side) may be provided in the first side wall portion 62d. The temperature sensor 9C is disposed inside the recessed portion.

[0132] (Variation 4, Variation 5)

[0133] like Figure 7 , Figure 8 As shown, the temperature sensors 9D and 9E may be arranged inside the pump chamber 10C and in the middle of the path 95 of the fluid O.

[0134] According to Modifications 4 and 5, by arranging temperature sensors 9D and 9E inside pump chamber 10C, the temperature of fluid O increased by heat generated by pump motor 71 can be measured, thereby detecting a sufficient decrease in viscosity of fluid O and improving the responsiveness of pump 70.

[0135] In addition, the temperature sensors 9D and 9E of the modified examples 4 and 5 are arranged in the path 95 of the fluid O inside the pump 70. The temperature of the fluid O flowing into the mechanism part 80 in the pump chamber 10C or the fluid O flowing out of the mechanism part 80 can be directly measured. Therefore, even if the fluid O flows, the heating mode and the driving mode can be switched according to the temperature change of the fluid O.

[0136] Figure 7 The temperature sensor 9D of the modified example 4 shown is provided on the discharge port 89b side of the path 95. The temperature sensor 9D can measure the temperature of the motor 2 (see Figure 1 ) of the cooling fluid O. Therefore, according to the relationship between the temperature of the fluid O detected by the temperature sensor 9D and the temperature of the motor 2, the heating mode and the driving mode of the pump 70 can be switched. In addition, the temperature sensor 9D of the modification 4 is arranged at a position that does not overlap with the mechanism part 80 when viewed from the axial direction of the pump axis J. Therefore, in this modification, the temperature sensor 9D is not arranged near the flow of the fluid O along the axial direction generated by the rotation of the mechanism part 80, so that damage to the temperature sensor 9D can be suppressed. The temperature sensor 9D can also be arranged on the inner wall constituting the discharge port 89b, for example. In this case, a recess can be provided on the inner wall, and the temperature sensor 9D can be arranged inside the recess. In addition, the temperature sensor 9D is arranged on the discharge port 89b side of the path 95, so the shape of the temperature sensor 9D itself can also be made into a shape with less resistance to flow.

[0137] Figure 8 The temperature sensor 9E of the modified example 5 shown is arranged on the side of the suction port 89a of the path 95. Therefore, the temperature sensor 9E can measure the temperature of the fluid O sucked into the mechanism part 80, and the control part 79 can switch the heating mode and the driving mode more accurately. Therefore, it is possible to suppress the load applied to the mechanism part 80. In the case where the temperature sensor 9E is arranged on the side of the suction port 89a of the path 95, the temperature sensor 9E can also be arranged on the inner wall constituting the suction port 89a. In this case, a recess can be provided on the inner wall, and the temperature sensor 9E can be arranged in the recess. The temperature sensor 9E is arranged on the side of the suction port 89a of the path 95, so the shape of the temperature sensor 9E itself can also be made into a shape with less resistance to flow.

[0138] (Variant 6)

[0139] like Fig. 9As shown, the temperature sensor 9F may also be arranged inside the pump chamber 10C and arranged at the detour portion 96. According to this modification, by arranging the temperature sensor 9F inside the pump chamber 10C, the temperature of the fluid O whose temperature rises due to the heat generated by the pump motor 71 can be measured, so that it is possible to detect that the viscosity of the fluid O is sufficiently reduced, and the responsiveness of the pump 70 can be improved. In addition, the temperature sensor 9F of this modification is arranged at the detour portion 96 located outside the path of the fluid O, so it is possible to suppress damage to the temperature sensor 9F due to the fluid O flowing in the path.

[0140] As described above, the discharge port 89b is arranged radially outside the pump axis J relative to the mechanism portion 80. The temperature sensor 9F of this modified example is arranged at a position different from the discharge port 89b in the circumferential direction of the pump axis J. The temperature sensor can be arranged inside the pump chamber 10C away from the discharge port 89b where the pressure of the fluid O is higher than the suction port 89a. Therefore, it is possible to suppress damage to the temperature sensor 9F due to the flow of the fluid O around the temperature sensor 9F. The temperature sensor 9F of this modified example is arranged at a position that does not overlap with the mechanism portion 80 when viewed from the axial direction of the pump axis J. Therefore, the temperature sensor 9F of this modified example is not arranged in the path of the flow of the fluid O along the axial direction generated by the rotation of the mechanism portion 80, and thus it is possible to suppress damage to the temperature sensor 9F.

[0141] (Variant 7)

[0142] It can also be Fig.10 10B, the temperature sensor 9G is arranged inside the pump chamber 10C and inside the recess 89c provided on the wall surface. In this modification, the inner wall surface of the pump chamber 10C is provided with a recess 89c which is recessed in the axial direction. The temperature sensor 9G is arranged in the recess 89c. According to this modification, by arranging the temperature sensor 9G in the recess 89c where the pressure of the fluid O is lower than that of the discharge port 89b, it is not easily affected by the flow of the fluid O with a high pressure, so that damage to the temperature sensor 9G can be suppressed.

[0143] The embodiments and modifications of the present invention are described above, but the various structures and their combinations in the embodiments are examples, and addition, omission, substitution and other changes of the structures can be made without departing from the scope of the main purpose of the present invention. In addition, the present invention is not limited to the embodiments.

[0144] In addition, the present technology can adopt the following structures.

[0145] (1) A drive device comprising: a motor having a shaft that can rotate around a motor axis; a power transmission unit that is connected to the shaft and transmits power from the motor; a housing that is provided with a gear chamber that accommodates the power transmission unit; a pump that pressurizes a fluid in the gear chamber; a temperature sensor that measures the temperature of the fluid; and a control unit that controls the pump based on the measurement result of the temperature sensor, wherein the temperature sensor is arranged either inside the pump or in the gear chamber.

[0146] (2) The drive device according to (1), wherein the temperature sensor is disposed in the gear chamber.

[0147] (3) The drive device according to (2), wherein the housing has a bottom wall portion located below the gear chamber, and the temperature sensor is disposed on an inner side surface of the bottom wall portion.

[0148] (4) The drive device according to (2) or (3), wherein a recess is provided on an inner wall surface of the housing constituting the gear chamber, and the temperature sensor is arranged inside the recess.

[0149] (5) The drive device according to any one of (2) to (4), wherein the temperature sensor overlaps with the pump when viewed from the axial direction.

[0150] (6) A drive device according to any one of (2) to (5), wherein the power transmission part is located on one axial side of the motor, and the housing has: a first side wall part, which covers the power transmission part from one axial side; and a second side wall part, which covers the power transmission part from the other axial side, the pump is arranged on one axial side of the first side wall part, and the temperature sensor is arranged on the other axial side of the first side wall part.

[0151] (7) A drive device according to any one of (2) to (5), wherein the power transmission part is located on one axial side of the motor, and the housing has: a first side wall portion, which covers the power transmission part from one axial side; and a second side wall portion, which covers the power transmission part from the other axial side, the pump is arranged on the other axial side of the second side wall portion, and the temperature sensor is arranged on one axial side of the second side wall portion.

[0152] (8) A drive device according to (1), wherein the pump comprises: a pump motor having a pump shaft that can rotate around a pump axis; a mechanism portion that is connected to the pump shaft and pressurizes the fluid; a pump chamber that accommodates the mechanism portion and the fluid; a suction port that allows the fluid to flow into the pump chamber; and a discharge port that discharges the fluid from the pump chamber, and the temperature sensor is arranged inside the pump chamber.

[0153] (9) The driving device according to (8), wherein the temperature sensor is arranged in a path connecting the suction port and the discharge port.

[0154] (10) The driving device according to (9), wherein the temperature sensor is provided on the suction port side of the path.

[0155] (11) A drive device according to any one of (8) to (10), wherein the pump has: a path connecting the suction port and the discharge port; and a detour portion, which is arranged in the pump chamber at a position different from the path, and the temperature sensor is configured in the detour portion.

[0156] (12) A drive device according to (8) or (11), wherein the discharge port is arranged radially outside the pump axis relative to the mechanism portion, and the temperature sensor is arranged at a position different from the discharge port in the circumferential direction of the pump axis.

[0157] (13) The drive device according to any one of (8), (11) or (12), wherein the temperature sensor is provided at a position that does not overlap with the mechanism portion when viewed in the axial direction of the pump axis.

[0158] (14) A drive device according to any one of (8), (11), (12) or (13), wherein a recessed portion recessed in the axial direction is provided on the inner wall surface of the pump chamber, and the temperature sensor is arranged in the recessed portion.

[0159] (15) A drive device according to any one of (1) to (14), wherein the pump comprises: a pump motor having a pump shaft that can rotate around a pump axis; a mechanism portion that is connected to the pump shaft and pressurizes the fluid; and a pump chamber that accommodates the mechanism portion, the pump chamber being capable of accommodating the fluid, the pump motor comprising: a rotor portion that can rotate around the pump axis together with the pump shaft; and a stator portion that surrounds the rotor portion from the radially outer side of the pump axis, and a heat transfer material is sandwiched between the stator portion and a wall portion surrounding the pump chamber.

[0160] (16) The drive device according to any one of (1) to (15), wherein the housing has a pump housing portion for housing the pump, and a heat transfer material is interposed between an inner wall surface of the pump housing portion and the pump.

Claims

1. A driving device, It is characterized in that The drive device has: A motor having a shaft rotatable about a motor axis; A power transmission part connected to the shaft to transmit the power of the motor; a housing provided with a gear chamber for accommodating the power transmission unit; a pump for pumping the fluid in the gear chamber; a temperature sensor that measures the temperature of the fluid; and a control unit that controls the pump based on the measurement result of the temperature sensor, The temperature sensor is disposed either inside the pump or in the gear chamber.

2. The driving device according to claim 1, It is characterized in that The temperature sensor is disposed in the gear chamber.

3. The driving device according to claim 2, It is characterized in that The housing has a bottom wall portion located at a lower side of the gear chamber, The temperature sensor is disposed on the inner side surface of the bottom wall portion.

4. The driving device according to claim 2, It is characterized in that A recess is provided on the inner wall surface of the housing constituting the gear chamber. The temperature sensor is disposed inside the recess.

5. The driving device according to claim 2, It is characterized in that When viewed in the axial direction, the temperature sensor overlaps with the pump.

6. The driving device according to claim 2, It is characterized in that The power transmission part is located on one axial side of the motor. The housing has: a first side wall portion covering the power transmission portion from one axial side; and a second side wall portion covering the power transmission portion from the other axial side, The pump is arranged on one axial side of the first side wall portion. The temperature sensor is disposed on the other axial side of the first side wall portion.

7. The driving device according to claim 2, It is characterized in that The power transmission part is located on one axial side of the motor. The housing has: a first side wall portion covering the power transmission portion from one axial side; and a second side wall portion covering the power transmission portion from the other axial side, The pump is arranged on the other axial side of the second side wall portion. The temperature sensor is disposed on one axial side of the second side wall portion.

8. The driving device according to claim 1, It is characterized in that The pump has: A pump motor having a pump shaft rotatable about a pump axis; A mechanism part connected to the pump shaft to pressurize the fluid; a pump chamber that accommodates the mechanism portion and the fluid; a suction port for allowing the fluid to flow into the pump chamber; and a discharge port for discharging the fluid from the pump chamber, The temperature sensor is disposed inside the pump chamber.

9. The driving device according to claim 8, It is characterized in that The temperature sensor is disposed in a path connecting the suction port and the discharge port.

10. The driving device according to claim 9, It is characterized in that The temperature sensor is disposed on the suction port side of the path.

11. The driving device according to claim 8, It is characterized in that The pump has: A path connecting the suction port and the discharge port; and a detour portion provided in the pump chamber at a position different from the path, The temperature sensor is disposed in the detour portion.

12. The driving device according to claim 8, It is characterized in that The discharge port is arranged radially outward of the pump axis relative to the mechanism portion. The temperature sensor is arranged at a position different from the discharge port in the circumferential direction of the pump axis.

13. The driving device according to claim 8, It is characterized in that The temperature sensor is provided at a position that does not overlap with the mechanism portion when viewed in the axial direction of the pump axis.

14. The driving device according to claim 8, It is characterized in that A recessed portion is provided on the inner wall surface of the pump chamber and is recessed in the axial direction. The temperature sensor is disposed in the recess.

15. The driving device according to claim 1, It is characterized in that The pump has: A pump motor having a pump shaft rotatable about a pump axis; A mechanism part connected to the pump shaft to pressurize the fluid; as well as a pump chamber that accommodates the mechanism portion; The pump chamber is capable of accommodating the fluid, The pump motor has: a rotor portion rotatable together with the pump shaft about a pump axis; and a stator portion surrounding the rotor portion from the radially outer side of the pump axis, A heat transfer material is interposed between the stator portion and a wall portion surrounding the pump chamber.

16. The driving device according to claim 1, It is characterized in that The housing has a pump housing portion for housing the pump. A heat transfer material is interposed between the inner wall surface of the pump housing portion and the pump.

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