JP5326657B2 - Assembling method of motor unit with built-in housing and motor unit with built-in housing - Google Patents

Description

  The present invention relates to a motor unit with a built-in housing and a method for assembling the motor unit with a built-in housing, which is applied to a drive system of a hybrid vehicle and includes a resolver that detects a rotor rotation angle.

  In a rotating machine equipped with a conventional resolver, the resolver is disposed outside the housing case of the rotating machine. The housing case includes a frame that supports a stator core of a rotating machine around which an exciting coil is wound, and a bracket that rotatably supports the output shaft of the rotor of the rotating machine via a bearing. It consisted of a resolver rotor fixed to the output shaft protruding outward from and a resolver stator fixed to the outer surface of the bracket. Further, the resolver rotor is fastened and fixed by a fastener between the fastener and a bearing that rotatably supports the output shaft (see, for example, Patent Document 1).

  Here, the “resolver” is a kind of angle detector and is also called a two-phase synchro. The structure is similar to that of an induction motor, and a two-phase coil having winding directions orthogonal to each other is wound around a resolver stator. When alternating current is passed through the two-phase coil of the resolver stator, the rotor rotation angle is detected by utilizing the fact that the phase of the voltage output from the two-phase coil changes as the resolver rotor rotates.

JP 2001-78393 A

  However, in a rotating machine equipped with a conventional resolver, the resolver rotor is clamped and fixed between a fastener and a bearing that rotatably supports the output shaft, and therefore the rotor of the rotating machine is strained by high-speed rotation. When this occurs, there is a problem that high stress is applied to the bearing, which may cause damage.

  The present invention has been made paying attention to the above-mentioned problem. The housing has a built-in structure capable of preventing damage to the bearing supporting the motor shaft, shortening the overall length of the unit, and improving the assembly accuracy of the resolver. It is an object to provide a method for assembling a motor unit and a motor unit with a built-in housing.

In order to achieve the above object, the motor unit with a built-in housing of the present invention includes a resolver for detecting a rotor rotation angle in a motor with a built-in housing constituted by a motor stator fixed on the housing side and a motor rotor fixed on the motor shaft side. Yes.
In this motor unit with a built-in housing, a clutch that is engaged and released by an actuator to the motor with a built-in housing is disposed inside the housing.
In this motor unit with a built-in housing, a motor side wall fixed to the housing and covering one side surface of the motor with a built-in housing is provided, and a bearing is interposed between the motor side wall and the motor shaft. And the resolver stator fixed to the motor side wall and the resolver by the resolver rotor fixed to the motor shaft are arranged in the rotor inner space formed between the bearing and the motor rotor.
In addition, the motor side wall is also used as a partition member for a motor / clutch, and an annular storage portion for mounting the actuator is formed on the motor side wall, and the bearing includes an inner peripheral wall portion of the annular storage portion and the It is interposed between the motor shafts.

Therefore, in the motor unit with a built-in housing according to the present invention, by interposing the bearing between the motor side wall and the motor shaft, the stress on the bearing is distributed by the motor side wall, and the possibility of damage to the bearing is greatly reduced. Is done.
Since the resolver is disposed in the rotor inner space formed between the bearing and the motor side wall, the axial length of the motor with built-in housing does not increase, and the overall length of the unit can be shortened. .
Furthermore, since the resolver stator is fixed to the motor side wall in advance, and the resolver stator and the resolver rotor are disposed to face each other in the rotor inner space, the assembly accuracy of the resolver can be improved.
In addition, when a load is applied from the actuator, the axial stress acting on the bearing is relieved by the stress dispersion action by the annular storage portion.
As a result, it is possible to achieve the prevention of breakage of the bearing supporting the motor shaft, the shortening of the entire unit length, the improvement of the resolver assembly accuracy, and the relaxation of the axial stress acting on the bearing .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall system diagram showing a rear-wheel drive FR hybrid vehicle to which a housing built-in motor unit according to a first embodiment is applied. 1 is an overall schematic diagram illustrating a configuration of a motor unit in which a motor / generator MG (an example of a motor with a built-in housing) according to a first embodiment is disposed. FIG. 3 is an assembly configuration diagram illustrating a motor / generator MG according to the subassembly of the first embodiment. It is an expanded sectional view showing the important section composition of the motor unit with a built-in housing provided with the resolver of Example 1. FIG. 10 is an explanatory diagram of an assembling operation showing a state in which the motor / generator MG subassembled is assembled to the automatic transmission having the housing fixed thereto. FIG. 10 is an explanatory diagram of an assembly operation showing a state in which the first clutch CL1 is assembled after the motor / generator MG is completely assembled to the automatic transmission having the housing fixed thereto.

  Hereinafter, the best mode for realizing a motor unit with a built-in housing according to the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall system diagram showing a rear-wheel drive FR hybrid vehicle to which the housing built-in motor unit of the first embodiment is applied.

  As shown in FIG. 1, the drive system of the FR hybrid vehicle in the first embodiment includes an engine Eng, a flywheel FW, a first clutch CL1, a motor / generator MG, a second clutch CL2, and an automatic transmission AT. And a propeller shaft PS, a differential DF, a left drive shaft DSL, a right drive shaft DSR, a left rear wheel RL, and a right rear wheel RR. Note that FL is the left front wheel and FR is the right front wheel.

  The engine Eng is a gasoline engine or a diesel engine, and engine start control, engine stop control, throttle valve opening control, fuel cut control, and the like are performed based on an engine control command from the engine controller 1. The engine output shaft is provided with a flywheel FW.

  The first clutch CL1 is a clutch interposed between the engine Eng and the motor / generator MG, and is generated by the first clutch hydraulic unit 6 based on a first clutch control command from the first clutch controller 5. Engagement / slip engagement (half-clutch state) / release is controlled by the first clutch control oil pressure. As the first clutch CL1, for example, a normally closed dry type in which a complete engagement is maintained by an urging force of a diaphragm spring and a stroke control using a release cylinder 14 having a piston 14a is controlled from a slip engagement to a complete release. A single plate clutch is used. The release cylinder 14 is a hydraulic actuator that attaches a clutch release bearing and presses the diaphragm spring instead of the release fork, and is also called CSC (abbreviation of Concentric Slave Cylinder).

  The motor / generator MG is a synchronous motor / generator in which a permanent magnet is embedded in a motor rotor and a stator coil is wound around a motor stator, and the three-phase generated by the inverter 3 based on a control command from the motor controller 2. It is controlled by applying an alternating current. The motor / generator MG can operate as an electric motor that is driven to rotate by receiving electric power from the battery 4 (hereinafter, this operation state is referred to as “powering”), and the motor rotor is driven from the engine Eng or the drive wheel. When receiving rotational energy, it functions as a generator that generates electromotive force at both ends of the stator coil, and can also charge the battery 4 (hereinafter, this operation state is referred to as “regeneration”). Note that the motor rotor of the motor / generator MG is connected to the transmission input shaft of the automatic transmission AT.

  The second clutch CL2 is a clutch interposed between the motor / generator MG and the left and right rear wheels RL and RR. Based on a second clutch control command from the AT controller 7, the second clutch hydraulic unit 8 The fastening / slip fastening / release is controlled by the control hydraulic pressure generated by the above. As the second clutch CL2, for example, a normally open wet multi-plate clutch or a wet multi-plate brake capable of continuously controlling the oil flow rate and hydraulic pressure with a proportional solenoid is used. The first clutch hydraulic unit 6 and the second clutch hydraulic unit 8 are built in an AT hydraulic control valve unit CVU attached to the automatic transmission AT.

  The automatic transmission AT is, for example, a stepped transmission that automatically switches stepped speeds such as forward 7 speed / reverse speed 1 according to vehicle speed, accelerator opening, etc., and the second clutch CL2 However, it is not newly added as a dedicated clutch, but the most suitable clutch or brake arranged in the torque transmission path is selected from a plurality of frictional engagement elements that are engaged at each gear stage of the automatic transmission AT. . The output shaft of the automatic transmission AT is connected to the left and right rear wheels RL and RR via a propeller shaft PS, a differential DF, a left drive shaft DSL, and a right drive shaft DSR.

  The hybrid drive system of the first embodiment includes an electric vehicle travel mode (hereinafter referred to as “EV mode”), a hybrid vehicle travel mode (hereinafter referred to as “HEV mode”), and a drive torque control travel mode (hereinafter referred to as “ It has a driving mode such as “WSC mode”.

  The “EV mode” is a mode in which the first clutch CL1 is opened and the vehicle travels only with the power of the motor / generator MG. The “HEV mode” is a mode in which the first clutch CL1 is engaged and the vehicle travels in any one of the motorist traveling mode, the traveling power generation mode, and the engine traveling mode. The "WSC mode" is used to control the rotational speed of the motor / generator MG when P, N → D select starts from the "HEV mode", or when the D range starts from the "EV mode" or "HEV mode". To maintain the slip engagement state of the second clutch CL2 and start while controlling the clutch torque capacity so that the clutch transmission torque passing through the second clutch CL2 becomes the required drive torque determined according to the vehicle state and driver operation. Mode. “WSC” is an abbreviation for “Wet Start clutch”.

Next, the control system of the hybrid vehicle will be described.
As shown in FIG. 1, the control system of the FR hybrid vehicle in the first embodiment includes an engine controller 1, a motor controller 2, an inverter 3, a battery 4, a first clutch controller 5, and a first clutch hydraulic unit 6. And an AT controller 7, a second clutch hydraulic unit 8, a brake controller 9, and an integrated controller 10. The engine controller 1, the motor controller 2, the first clutch controller 5, the AT controller 7, the brake controller 9, and the integrated controller 10 are connected via a CAN communication line 11 that can mutually exchange information. ing.

  The engine controller 1 inputs engine speed information from the engine speed sensor 12, a target engine torque command from the integrated controller 10, and other necessary information. Then, a command for controlling the engine operating point (Ne, Te) is output to the throttle valve actuator or the like of the engine Eng.

  The motor controller 2 inputs information from the resolver 61 that detects the rotor rotation position of the motor / generator MG, a target MG torque command and target MG rotation speed command from the integrated controller 10, and other necessary information. Then, a command for controlling the motor operating point (Nm, Tm) of the motor / generator MG is output to the inverter 3. The motor controller 2 monitors the battery SOC representing the charge capacity of the battery 4, and this battery SOC information is used as control information for the motor / generator MG and is integrated via the CAN communication line 11. 10 is supplied.

  The first clutch controller 5 inputs sensor information from the first clutch stroke sensor 15 that detects the stroke position of the piston 14a of the release cylinder 14, a target CL1 torque command from the integrated controller 10, and other necessary information. . Then, a command for controlling engagement / slip engagement / release of the first clutch CL1 is output to the first clutch hydraulic unit 6 in the AT hydraulic control valve unit CVU.

  The AT controller 7 inputs information from an accelerator opening sensor 16, a vehicle speed sensor 17, and other sensors 18 (transmission input rotation speed sensor, inhibitor switch, etc.). Then, when driving with the D range selected, a control command for obtaining the searched gear position is searched for the optimum gear position based on the position where the operating point determined by the accelerator opening APO and the vehicle speed VSP exists on the shift map. Output to AT hydraulic control valve unit CVU. The shift map is a map in which an upshift line and a downshift line are written according to the accelerator opening and the vehicle speed. In addition to the above automatic shift control, when a target CL2 torque command is input from the integrated controller 10, a command for controlling slip engagement of the second clutch CL2 is output to the second clutch hydraulic unit 8 in the AT hydraulic control valve unit CVU. Second clutch control is performed. Further, when the shift control change command is output from the integrated controller 10, the shift control according to the shift control change command is performed instead of the shift control normally.

  The brake controller 9 inputs a wheel speed sensor 19 for detecting the wheel speeds of the four wheels, sensor information from the brake stroke sensor 20, a regenerative cooperative control command from the integrated controller 10, and other necessary information. And, for example, at the time of brake depression, if the regenerative braking force is insufficient with respect to the required braking force required from the brake stroke BS, the shortage is compensated with mechanical braking force (hydraulic braking force or motor braking force) Regenerative cooperative brake control is performed.

  The integrated controller 10 manages the energy consumption of the entire vehicle and has a function for running the vehicle with the highest efficiency. The motor rotation number sensor 21 for detecting the motor rotation number Nm and other sensors and switches 22 Necessary information and information via the CAN communication line 11 are input. The target engine torque command to the engine controller 1, the target MG torque command and the target MG speed command to the motor controller 2, the target CL1 torque command to the first clutch controller 5, the target CL2 torque command to the AT controller 7, and the brake controller 9 Regenerative cooperative control command is output.

  FIG. 2 is an overall schematic diagram illustrating a configuration of a motor unit in which the motor / generator MG (an example of a motor with a built-in housing) according to the first embodiment is disposed. FIG. 3 is an assembly configuration diagram illustrating the motor / generator MG according to the subassembly of the first embodiment. The configuration of the motor unit incorporating the motor / generator MG will be described below with reference to FIGS.

  As shown in FIG. 2, the motor unit housing 30 incorporating the motor / generator MG of the first embodiment has a front side bolted to an engine block 31 of the engine Eng by a flange and a rear side a transmission case 32 of the automatic transmission AT. It is bolted with a flange.

  As shown in FIG. 2, the housing 30 includes a first clutch CL1 mounted on the crankshaft 33 of the engine Eng, and a motor / fixed from the inner surface side of the housing 30 with bolts 34 in the form of a subassembly. Generator MG is arranged.

  As shown in FIG. 2, the first clutch CL1 is interposed between the crankshaft 33 of the engine Eng and the hollow motor shaft 43 of the motor / generator MG, and is kept completely engaged by the urging force of the diaphragm spring 35. This is a normally closed dry single-plate clutch that is controlled from the slip engagement to the full release by the piston stroke control of the release cylinder 14 attached to the motor / generator MG in the sub-assembly form.

  As shown in FIG. 3, the motor / generator MG has a sub-assembly configuration in which three parts of a motor cover 40, a motor stator 41 (stator), and a motor rotor 42 (rotor) are assembled.

  The motor cover 40 is a member fixed to the stepped portion of the housing 30 by a bolt 34, and has an annular recess 40a in which the release cylinder 14 is mounted as shown in FIG. A front-side bearing 44 that rotatably supports the hollow motor shaft 43 and a seal ring 45 that maintains oil tightness with the hollow motor shaft 43 are provided at the center position of the motor cover 40.

  As shown in FIG. 3, the motor stator 41 is constituted by a stator core 41b that is press-fitted and fixed to the stator housing 46 and in which a plurality of core pieces around which the stator coil 41a is wound are arranged in an annular shape. A water jacket 47 through which cooling water flows is formed on the outer periphery of the motor stator 41 of the stator housing 46 to cool the motor stator 41. A rear-side bearing 48 that rotatably supports the hollow motor shaft 43 is provided at the center position of the motor stator 41.

  The motor rotor 42 is press-fitted and fixed to a rotor support component 49 extending in a radial direction from the hollow motor shaft 43 and integrally provided, and a permanent magnet 42a is embedded in the laminated plate. The motor rotor 42 is disposed with respect to the motor stator 41 via a radial air gap.

  The assembly of the three parts of the motor cover 40, the motor stator 41, and the motor rotor 42 constituting the motor / generator MG is performed on one side of the motor rotor 42 fixed to the hollow motor shaft 43 and the rotor support part 49 as shown in FIG. The motor cover 40 is sandwiched from the other side, the stator housing 46 to which the motor stator 41 is fixed is sandwiched from the other side, and the motor cover 40 and the motor stator 41 are fixed by the bolts 36.

  As shown in FIG. 2, the transmission case 32 includes an AT transmission unit 50, an AT hydraulic control valve unit CVU, a sub valve unit 51, an oil pan 52, a transmission input shaft 53, and a mechanical oil pump 54. And a pump housing 55 and a pump cover 56. The tip of the transmission input shaft 53 is splined to the hollow motor shaft 43.

  As shown in FIG. 2, the motor / generator MG is provided with a high-voltage harness 57 connected to the stator coil 41 a and a cooling water inlet / outlet 58 communicating with the water jacket 47. The housing 30 is formed with a through hole 59 in the lower part on the engine Eng side so that water and air can enter and exit from the space where the first clutch CL1 is disposed.

A motor shaft alignment configuration of the motor / generator MG with respect to the clutch rotation center shaft of the first clutch CL1 will be described.
On the engine Eng side, the clutch rotation center shaft of the first clutch CL1 is aligned with the path of the crankshaft 33 → the engine block 31 → the housing 30. On the other hand, on the motor / generator MG side, the position of the front bearing 44 of the hollow motor shaft 43 is determined by the path of the motor cover 40 → the housing 30, and the position of the rear bearing 48 of the hollow motor shaft 43 is determined by the stator housing 46. → It is determined by the path of the motor cover 40 → the housing 30. Therefore, the motor shaft (hollow motor shaft 43) can be aligned with the clutch rotation center shaft.

The centering configuration of the motor stator 41 and the motor rotor 42 of the motor / generator MG will be described.
In the motor stator 41, the motor cover 40 and the stator housing 46 are integrated, and the central axis is determined by fixing the housing 30 with the bolt 34. With respect to the motor stator 41, the motor rotor 42 is configured so that the hollow motor shaft 43 is rotatably supported by a front-side bearing 44 and a rear-side bearing 48 at front and rear positions with respect to an integral motor cover 40 and stator housing 46. Is decided. Therefore, the centers of the motor stator 41 and the motor rotor 42 can be aligned.

The motor shaft alignment configuration of the motor / generator MG with respect to the central axis of the transmission input shaft 53 will be described.
The pump housing 55 is fixed in alignment with the central axis of the transmission input shaft 53, and the pump cover 56 is fixed to the pump housing 55 by axial alignment. On the other hand, a shaft alignment fitting portion 60 having an inner peripheral surface that is fitted to the outer peripheral surface of the pump cover 56 is provided on the stator housing 46 in a protruding manner. Then, by fitting the inner peripheral surface of the shaft fitting portion 60 to the outer peripheral surface of the pump cover 56 during assembly, the motor shaft can be aligned with the central axis of the transmission input shaft 53 with a short path and with high accuracy. it can.

A configuration for receiving the reaction force of the hydraulic operation of the first clutch CL1 will be described.
When the first clutch CL1 is hydraulically operated, the first clutch CL1 is on the engine Eng side, and the release cylinder 14 is on the motor cover 40 of the motor / generator MG. Therefore, the force near the motor is the release force (about 150 kg to 300 kg). However, it is transmitted to the motor cover 40 → the stator housing 46 → the housing 30, and it is necessary to support the load. On the other hand, the axial force applied to the stator housing 46 is abutted and supported by the triangular portion shown in FIG. 2 from the transmission case 32 side.

  FIG. 4 is an enlarged cross-sectional view illustrating a main configuration of a motor unit with a built-in housing including the resolver according to the first embodiment. Hereinafter, based on FIG. 4, the structure of the motor unit with a built-in housing provided with the resolver of the first embodiment will be described.

  As shown in FIG. 4, the motor unit with a built-in housing according to the first embodiment includes a motor / generator MG (a motor / generator MG) including a motor stator 41 fixed to the housing 30 and a motor rotor 42 fixed to the hollow motor shaft 43 (motor shaft). The housing built-in motor) is provided with a resolver 61 for detecting the rotor rotation angle.

  In the motor unit with a built-in housing, a motor cover 40 (motor side wall) that is fixed to the housing 30 with a bolt 34 and covers one side surface of the motor / generator MG is provided. 44 (bearing, first bearing) is interposed. A resolver stator 62 fixed to the motor cover 40 and a resolver 61 including a resolver rotor 63 fixed to the hollow motor shaft 43 are arranged in a rotor inner space 64 formed between the front bearing 44 and the motor rotor 42. .

  A first clutch CL1 (clutch) that is fastened and released by a release cylinder 14 (actuator) is disposed in the housing 30 adjacent to the motor / generator MG, and the motor cover 40 is connected to a motor / clutch partition member. In addition, the motor cover 40 is formed with an annular recess 40a (annular storage portion) in which the release cylinder 14 is mounted. The front bearing 44 is interposed between the inner peripheral wall portion of the annular recess 40 a and the hollow motor shaft 43, and an axial gap t is provided between the front bearing 44 and the resolver rotor 63.

  A stator housing 46 that fixes the motor stator 41 and covers the other side of the motor / generator MG is provided, and the stator housing 46 and the hollow are fixed to the front bearing 44 interposed between the motor cover 40 and the hollow motor shaft 43. A rear side bearing 48 (second bearing) is interposed between the motor shafts 43. Then, the axial distance from the axial center line CL of the motor rotor 42 to the support center position of the front bearing 44 with respect to the axial distance L2 from the axial center line CL of the motor rotor 42 to the support center position of the rear bearing 48. L1 is set short.

  A transmission case 32 (transmission case) of an automatic transmission AT (transmission) is connected to the end of the housing 30 (see FIG. 2), and a rear bearing 48 is connected to a mechanical oil pump via a hollow motor shaft 43. A transmission input shaft 53 for driving 54 (oil pump) is supported.

Next, the operation will be described.
The operation of the motor unit with a built-in housing according to the first embodiment will be described by dividing it into “the operation of assembling the resolver to the motor with a built-in housing”, “the operation of assembling the motor unit with a built-in housing”, and “characteristic operation of the motor unit with a built-in housing”.

[Resolver assembly action to motor with built-in housing]
Hereinafter, the action of assembling the resolver to the motor / generator MG which is a motor with a built-in housing will be described with reference to FIG.

  An assembling method for assembling a resolver 61 for detecting a rotor rotation angle to a motor / generator MG constituted by a motor stator 41 fixed on the housing 30 side and a motor rotor 42 fixed on the motor shaft 43 side includes a resolver rotor setting procedure, a resolver The stator setting procedure, the rear bearing setting procedure (second bearing setting procedure), and the pinching and fixing procedure are performed. Each procedure will be described below.

  In the resolver rotor setting procedure, the resolver rotor 63 is set in the rotor assembly in which the motor rotor 42 is fixed to the rotor support component 49 extending in the radial direction from the hollow motor shaft 43.

  In the resolver stator setting procedure, the front side bearing 44 (first bearing) and the resolver stator 62 are set on the motor cover 40 that covers one side of the motor / generator MG.

  In the rear side bearing setting procedure, a rear side bearing 48 (second bearing) is set in the stator housing 46 that fixes the motor stator 41 and covers the other side surface of the motor / generator MG.

  In the clamping and fixing procedure, the motor cover 40 with the resolver stator 62 set from one side is clamped with respect to the rotor assembly with the resolver rotor 63 set, the stator housing 46 is clamped from the other side, and the motor cover 40 and the stator housing 46 are It is fixed with bolts 36.

  Therefore, the motor / generator MG including the resolver 61 with high assembling accuracy can be assembled by the subassembly by a simple procedure of sandwiching and fixing the motor cover 40 and the stator housing 46 to the rotor assembly in which the resolver rotor 63 is set. it can.

For example, in the case of an assembling method in which the resolver stator is attached after fixing the resolver stator in advance, there is a possibility that the resolver is damaged due to contact when the resolver rotor is attached.
On the other hand, since the resolver stator 62 set in advance on the motor cover 40 is assembled to the rotor assembly in which the resolver rotor 63 is set in advance, the possibility of breakage of the resolver 61 can be greatly reduced.

[Assembly action of motor unit with built-in housing]
Hereinafter, the assembly operation of the motor unit with a built-in housing by the sub-assembled motor / generator MG and the first clutch CL1 will be described with reference to FIGS.

  When the motor unit with a built-in housing of the first embodiment is assembled on the transmission input shaft 53 side of the automatic transmission AT, first, the housing 30 is bolted to the transmission case 32 as shown in FIG. On the other hand, the motor / generator MG provided with the resolver 61 is assembled by the subassembly in accordance with the above assembling operation.

  Then, as shown in FIG. 5, when the motor / generator MG provided with the resolver 61 is inserted toward the inside of the housing 30, the hollow motor shaft 43 and the tip end portion of the transmission input shaft 53 are spline-coupled. At this time, the inner peripheral surface of the shaft alignment fitting portion 60 protruding from the stator housing 46 is fitted to the outer peripheral surface of the pump cover 56, and the shaft is aligned with the central axis of the transmission input shaft 53. Is achieved. The motor / generator MG provided with the resolver 61 is assembled inside the housing 30 by fixing the motor cover 40 to the housing 30 with the bolts 34 in this axial alignment state.

  Next, as shown in FIG. 6, the release cylinder 14 is assembled in the annular recess 40a formed in the motor cover 40 of the motor / generator MG. Thereafter, when the assembly of the first clutch CL1 is inserted toward the inside of the housing 30 as shown in FIG. 6, the output side hub 37 of the first clutch CL1 is spline-fitted to the tip of the hollow motor shaft 43. Is done.

  Of the motor unit with built-in housing assembled in this way, the flywheel FW of the first clutch CL1 is assembled to the crankshaft 33 of the engine Eng, and the housing 30 is fixed to the bolts of the engine block 31, whereby the hybrid drive system is Will be assembled.

  Therefore, the housing with high positioning accuracy can be achieved by a simple procedure in which the motor / generator MG of the subassembly and the clutch assembly of the first clutch CL1 are inserted from one direction from the opening side of the housing 30 bolted to the transmission case 32. The motor / generator MG and the first clutch CL1 can be assembled in the 30.

[Characteristic action of motor unit with built-in housing]
In the first embodiment, the motor / generator MG includes a resolver 61 having a resolver 61 that detects the rotor rotation angle. The motor / generator MG includes a motor cover 40 that is fixed to the housing 30 and covers one side of the motor / generator MG. A front bearing 44 is interposed between the cover 40 and the hollow motor shaft 43. A resolver stator 62 fixed to the motor cover 40 and a resolver 61 including a resolver rotor 63 fixed to the hollow motor shaft 43 are arranged in a rotor inner space 64 formed between the front bearing 44 and the motor rotor 42. .
As described above, by interposing the front bearing 44 between the motor cover 40 and the hollow motor shaft 43, stress on the front bearing 44 is dispersed by the motor cover 40. As a result, the possibility of breakage of the front bearing 44 can be greatly reduced.
Since the resolver 61 is disposed in the rotor inner space 64 formed between the front bearing 44 and the motor rotor 42, the axial length of the motor / generator MG does not increase. As a result, the entire unit length can be shortened.
Furthermore, since the resolver stator 62 is fixed to the motor cover 40 in advance, and the resolver stator 62 and the resolver rotor 63 are disposed to face each other in the rotor inner space 64, the assembly accuracy of the resolver 61 can be improved.

In the first embodiment, the first clutch CL1 that is fastened and released by the release cylinder 14 is disposed in the housing 30 adjacent to the motor / generator MG, and the motor cover 40 is also used as a partition member for the motor / clutch. At the same time, an annular recess 40a for mounting the release cylinder 14 is formed in the motor cover 40. The front bearing 44 is interposed between the inner peripheral wall portion of the annular recess 40 a and the motor shaft 43, and an axial gap t is provided between the front bearing 44 and the resolver rotor 63.
Accordingly, when a load is applied from the release cylinder 14, the axial stress acting on the front bearing 44 can be relieved by the stress dispersion action by the annular recess 40 a and the axial stress acting on the front bearing 44. Thus, even if the front bearing 44 is slightly moved in the axial direction, interference with the resolver rotor 63 can be prevented by the axial gap t. As a result, damage to the front bearing 44 can be avoided.

In the first embodiment, the motor stator 41 is fixed and a stator housing 46 that covers the other side surface of the motor / generator MG is provided, and the stator is fixed to the front side bearing 44 interposed between the motor cover 40 and the hollow motor shaft 43. A rear side bearing 48 is interposed between the housing 46 and the hollow motor shaft 43. Then, the axial distance from the axial center line CL of the motor rotor 42 to the support center position of the front bearing 44 with respect to the axial distance L2 from the axial center line CL of the motor rotor 42 to the support center position of the rear bearing 48. L1 is set short.
That is, from the axial centerline CL obtained by multiplying the stress resistance of the front bearing 44 by the axial distance L1, and the axial centerline CL obtained by multiplying the stress resistance of the rear bearing 48 and the axial distance L2. Therefore, the motor rotor 42 is stably supported so as to be rotatable.
Therefore, the rigidity of the rear side bearing 48 can be reduced by the amount of increase in stress resistance in order for the front side bearing 44 to hold the release cylinder 14. In other words, the stress resistance of the rear side bearing 48 can be set lower than that of the front side bearing 44, and the rear side bearing 48 can be made compact accordingly.

In the first embodiment, the transmission case 32 of the automatic transmission AT is connected to the end of the housing 30, and the rear bearing 48 has a transmission input shaft 53 that drives the mechanical oil pump 54 via the hollow motor shaft 43. I support it.
Thus, since the spline-fitted hollow motor shaft 43 and the transmission input shaft 53 are supported by the rear-side bearing 48, the swing of the bearing portion with respect to the transmission input shaft 53 is reduced, and the rear-side bearing 48 The load on can be reduced.
In addition, since the shaft runout of the transmission input shaft 53 can be similarly reduced, the driving of the mechanical oil pump 54 driven by the transmission input shaft 53 can be stabilized.

Next, the effect will be described.
In the housing built-in motor unit and the housing built-in motor unit according to the first embodiment, the effects listed below can be obtained.

(1) A resolver 61 that detects a rotor rotation angle in a motor with built-in housing (motor / generator MG) constituted by a motor stator 41 fixed on the housing 30 side and a motor rotor 42 fixed on the motor shaft (hollow motor shaft 43) side. The motor unit with a built-in housing includes a motor side wall (motor cover 40) that is fixed to the housing 30 and covers one side surface of the motor / generator MG. A bearing (front side) is provided between the motor side wall and the motor shaft. A rotor inner space 64 formed between the bearing and the motor rotor 42 includes a resolver stator 62 that is fixed to the motor side wall and a resolver rotor 63 that is fixed to the motor shaft. Arranged.
For this reason, a motor unit with a built-in housing that achieves both prevention of breakage of the bearing (front side bearing 44) supporting the motor shaft (hollow motor shaft 43), shortening of the overall length of the unit, and improvement of the assembly accuracy of the resolver 61. Can be provided.

(2) A clutch (first clutch CL1) that is engaged / released by an actuator (release cylinder 14) is disposed inside the housing 30 adjacent to the motor (motor / generator MG) with a built-in housing, and the motor The side wall (motor cover 40) is also used as a partition member for the motor / clutch, and the motor side wall is formed with an annular storage portion (annular recess 40a) for mounting the actuator. The bearing (front side bearing 44) is In addition to being interposed between the inner peripheral wall portion of the annular housing portion and the motor shaft (hollow motor shaft 43), an axial gap t is provided between the bearing and the resolver rotor 63.
Therefore, when a load is applied from the actuator (release cylinder 14), the axial stress acting on the bearing (front side bearing 44) can be relieved, and the bearing (front side bearing 44) and the resolver rotor 63 can be relieved. Interference can be prevented.

(3) A stator housing 46 that fixes the motor stator 41 and covers the other side surface of the motor with built-in housing (motor / generator MG) is provided, and the motor side wall (motor cover 40) and the motor shaft (hollow motor shaft 43) are provided. ) Between the stator housing 46 and the motor shaft, a second bearing (rear side bearing 48) is interposed between the motor rotor 42 and the motor rotor 42. The first bearing (front side) from the axial center line CL of the motor rotor 42 with respect to the axial distance L2 from the axial center line CL to the support center position of the support center position of the second bearing (rear bearing 48). The axial distance L1 to the support center position of the bearing 44) was set short.
For this reason, the rigidity of the second bearing (rear side bearing 48) can be lowered by the amount that the first bearing (front side bearing 44) increases the stress resistance to hold the actuator (release cylinder 14).

(4) A transmission case (transmission case 32) of a transmission (automatic transmission AT) is connected to an end of the housing 30, and the second bearing (rear side bearing 48) is connected to the motor shaft (hollow motor). A transmission input shaft 53 for driving an oil pump (mechanical oil pump 54) was supported via a shaft 43).
Therefore, the swing of the bearing portion with respect to the transmission input shaft 53 is reduced, the load on the rear bearing 48 can be reduced, and the drive of the mechanical oil pump 54 driven by the transmission input shaft 53 is stabilized. be able to.

(5) A motor with a built-in housing in which a resolver 61 for detecting a rotor rotation angle is assembled to a motor with a built-in housing (motor / generator MG) composed of a motor stator 41 fixed on the housing 30 side and a motor rotor 42 fixed on the motor shaft 43 side. In the unit assembly method,
A resolver rotor setting procedure for setting a resolver rotor 63 in a rotor assembly in which the motor rotor 42 is fixed to a rotor support component 49 extending in a radial direction from the motor shaft (hollow motor shaft 43);
A resolver stator setting procedure for setting a first bearing (front side bearing 44) and a resolver stator 62 on a motor side wall (motor cover 40) covering one side of the motor with built-in housing (motor / generator MG);
A second bearing setting procedure (rear side bearing setting) for setting a second bearing (rear side bearing 48) in the stator housing 46 that fixes the motor stator 41 and covers the other side of the motor (motor / generator MG) with a built-in housing. Step) and
With respect to the rotor assembly in which the resolver rotor 63 is set, the motor side wall (motor cover 40) in which the resolver stator 62 is set is sandwiched from one side, the stator housing 46 is sandwiched from the other side, and the motor side wall (motor cover) 40) and a pinching and fixing procedure for fixing the stator housing 46;
Have
For this reason, a motor unit with a built-in housing that achieves both prevention of breakage of the bearing (front side bearing 44) supporting the motor shaft (hollow motor shaft 43), shortening of the overall length of the unit, and improvement of the assembly accuracy of the resolver 61. Assembling method can be provided.

  The housing built-in motor unit and the method for assembling the housing built-in motor unit according to the present invention have been described based on the first embodiment, but the specific configuration is not limited to the first embodiment, and Modifications and additions of the design are permitted without departing from the spirit of the invention according to the claims.

  In the first embodiment, an example of a motor unit with a built-in housing in which the motor / generator MG and the first clutch CL1 are built in the housing 30 is shown. However, only the motor / generator MG may be built in the housing. In addition, motors and generators MG and multiple clutches and brakes are built in as unit parts, motors and generators MG and reduction gears are built in as unit parts, etc. It may be an example.

  In Example 1, the example which applied the motor unit with a built-in housing of this invention to the hybrid drive system of FR hybrid vehicle was shown. However, for example, the motor unit with a built-in housing of the present invention and its mounting method can also be applied to a drive system such as an FF hybrid vehicle, an electric vehicle, or a fuel cell vehicle. In short, any motor unit with a built-in housing including a resolver can be applied.

Eng engine
MG motor / generator (motor with built-in housing)
AT automatic transmission (transmission)
CL1 1st clutch (clutch)
CL2 2nd clutch
RL left rear wheel
RR Right rear wheel 1 Engine controller 2 Motor controller 3 Inverter 4 Battery 5 First clutch controller 6 First clutch hydraulic unit 7 AT controller 8 Second clutch hydraulic unit 9 Brake controller 10 Integrated controller 14 Release cylinder (actuator)
30 Housing 31 Engine block 32 Transmission case (transmission case)
33 Crankshaft 34 Bolt 35 Diaphragm spring 36 Bolt 40 Motor cover (motor side wall)
40a Annular recess (annular storage part)
42 Motor rotor 41 Motor stator 43 Hollow motor shaft (motor shaft)
44 Front bearing (bearing, first bearing)
46 Stator housing 48 Rear bearing (second bearing)
53 Transmission input shaft 53
54 Mechanical oil pump (oil pump)
61 resolver 62 resolver stator 63 resolver rotor 64 rotor inner space t axial gap
CL axial center line
L1, L2 Axial distance

Claims (5)

A housing built-in motor constituted by a motor stator fixed on the housing side and a motor rotor fixed on the motor shaft side is provided with a resolver for detecting the rotor rotation angle ,
In the housing built-in motor unit in which a clutch that is operated to be engaged / released by an actuator is disposed in the housing built-in motor,
The motor side wall is fixed to the housing and covers one side surface of the housing built-in motor,
A bearing is interposed between the motor side wall and the motor shaft,
The resolver stator fixed to the motor side wall and the resolver by the resolver rotor fixed to the motor shaft are arranged in a rotor inner space formed between the bearing and the motor rotor ,
The motor side wall is also used as a partition member for a motor / clutch, and an annular storage portion for mounting the actuator is formed on the motor side wall,
The motor unit with a built-in housing , wherein the bearing is interposed between an inner peripheral wall portion of the annular storage portion and the motor shaft . In the motor unit with a built-in housing according to claim 1,
The bearing housing built motor unit, characterized in that a axial gap between the front SL bearing and the resolver rotor. In the motor unit with a built-in housing according to claim 2,
While fixing the motor stator, provided a stator housing that covers the other side of the housing built-in motor,
When a bearing interposed between the motor side wall and the motor shaft is a first bearing, a second bearing is interposed between the stator housing and the motor shaft,
The axial distance from the axial center line of the motor rotor to the support center position of the first bearing is set shorter than the axial distance from the axial center line of the motor rotor to the support center position of the second bearing. A motor unit with a built-in housing. In the motor unit with a built-in housing according to claim 3,
A transmission case of the transmission is coupled to the end of the housing;
The motor unit with a built-in housing, wherein the second bearing supports a transmission input shaft that drives an oil pump via the motor shaft. A resolver that detects the rotor rotation angle is assembled to a motor with a built-in housing composed of a motor stator fixed on the housing side and a motor rotor fixed on the motor shaft side .
In the housing, the method of assembling the housing internal motor unit that assembling the clutch is engaged, the opening operation by the actuator to the housing internal motor,
The fixed rotor assembly of the rotor to the rotor support member extending radially from the motor shaft, the resolver rotor assembly procedure that assembling the resolver rotor,
Covering one side of said housing internal motor, and the motor side walls annular housing portion to assemble the actuator is formed, and the resolver stator assembly procedure that assembled Rutotomoni resolver stator assembled first bearing,
The stator housing to cover the other side surface of the housing internal motor is fixed to the motor stator, a second bearing assembly procedure that assembling the second bearing,
A sandwiching and fixing procedure for sandwiching the motor side wall with the resolver stator assembled from one side and sandwiching the stator housing from the other side and fixing the motor side wall and the stator housing to the rotor assembly assembled with the resolver rotor When,
A method of assembling a motor unit with a built-in housing, comprising:

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