CN110311508B

CN110311508B - Rotating electrical machine device and vehicle provided with same

Info

Publication number: CN110311508B
Application number: CN201910231161.4A
Authority: CN
Inventors: 美浦一叶
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2018-03-27
Filing date: 2019-03-25
Publication date: 2022-04-19
Anticipated expiration: 2039-03-25
Also published as: JP2019173772A; CN110311508A

Abstract

The invention provides a rotating electric device which can realize miniaturization and light weight by a simple structure and can play a torque amplification role, and a vehicle with the rotating electric device. The rotating electric device is provided with: a stator around which a coil is wound; a rotor having a magnet, disposed on an inner diameter side of the stator, and having an inner space portion; a rotating shaft provided to be rotatable by transmission of a rotational force of the rotor; a planetary gear mechanism which is disposed in the inner space of the rotor and has a sun gear, a pinion gear, a planet gear carrier, and a ring gear; a first clutch mechanism fixed to the housing and capable of gripping the carrier; and a second clutch mechanism which is fixed to the rotating shaft, can grip the carrier, and is provided so as to be capable of switching between engagement and disengagement of the first clutch mechanism and engagement and disengagement of the second clutch mechanism in accordance with a required torque.

Description

Rotating electrical machine device and vehicle provided with same

Technical Field

The present invention relates to a rotating electric device and a vehicle equipped with the rotating electric device.

Background

For example, patent documents 1 and 2 disclose rotating electric devices including a first motor, a second motor, and a speed change mechanism capable of switching a reduction ratio.

In the rotating electric machine devices disclosed in patent documents 1 and 2, the torque amplification effect can be exhibited by the entire system by combining the torque of the first motor and the torque of the second motor which are coaxially arranged.

Prior art documents

Patent document 1: japanese patent laid-open publication No. 2017-147884

Patent document 2: japanese patent No. 6194969

However, in the rotating electric machine devices disclosed in patent documents 1 and 2, since the two motors are coaxially arranged, it is difficult to achieve downsizing and weight reduction of the rotating electric machine device as a whole.

Further, the use of two motors including the first motor and the second motor increases the number of components, which may increase the manufacturing cost.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotating electric device and a vehicle including the rotating electric device, which can be reduced in size and weight by a simple structure and can exhibit a torque amplification effect.

Means for solving the problems

In order to achieve the above object, a rotating electric device according to the present invention includes: a housing; a stator around which a coil is wound; a rotor having a magnet, disposed on an inner diameter side of the stator, and having an inner space portion; a shaft provided to be rotatable by transmission of a rotational force of the rotor; and a transmission portion having: a planetary gear mechanism which is built in the internal space of the rotor, and which has a sun gear, a planetary carrier, and a ring gear; a first clutch mechanism fixed to the housing and capable of gripping the carrier; and a second clutch mechanism fixed to the shaft and capable of gripping the carrier, wherein the transmission unit is provided so as to be capable of switching between engagement and disengagement of the first clutch mechanism and engagement and disengagement of the second clutch mechanism in accordance with a required torque.

Effects of the invention

In the present invention, a rotating electric device and a vehicle including the rotating electric device can be obtained that can be reduced in size and weight with a simple structure and that can exhibit a torque amplification effect.

Drawings

Fig. 1 is a schematic structural sectional view of a rotating electric device according to an embodiment of the present invention.

Fig. 2 is a schematic sectional view of the planetary gear mechanism shown in fig. 1.

Fig. 3 (a) is a block diagram showing a torque transmission path in the case of high torque, fig. 3 (b) is a characteristic diagram showing input/output torque transmitted in the case of fig. 3 (a), fig. 3 (c) is a block diagram showing a torque transmission path in the case of low torque, and fig. 3 (d) is a characteristic diagram showing input/output torque transmitted in the case of fig. 3 (c).

Fig. 4 is a schematic diagram showing a high torque transmission path.

Fig. 5 is a schematic diagram showing a low torque transmission path.

Description of reference numerals:

10 a rotating electrical machine device; 12 rotor (magnetic path constituting part); 14 a stator; 16 rotating shaft (shaft); 18 a planetary gear mechanism (transmission portion); 20 a first clutch mechanism (transmission portion); 22 a second clutch mechanism (transmission portion); 24 a housing; 30 sun gear; 32 planetary gears; 32a, 32b pinion; 34 ring gear; 36 planet carrier.

Detailed Description

Next, embodiments of the present invention will be described in detail with reference to the appropriate drawings. Fig. 1 is a schematic structural sectional view of a rotating electric device according to an embodiment of the present invention, and fig. 2 is a schematic sectional view of a planetary gear mechanism shown in fig. 1.

The rotating electrical machine device 10 according to the embodiment of the present invention is configured by, for example, a three-phase ac brushless motor. As shown in fig. 1, the rotating electric device 10 includes a rotor 12, a stator 14, a rotary shaft (shaft) 16, a planetary gear mechanism 18, a first clutch mechanism 20 (also referred to as "CL 1"), a second clutch mechanism 22 (also referred to as "CL 2"), and a housing 24. The planetary gear mechanism 18, the first clutch mechanism 20, and the second clutch mechanism 22 function as a transmission unit.

The rotor 12 is a rotor that rotates by magnetic force generated by the stator 14, and functions as a magnetic path constituting part. The rotor 12 includes a cylindrical rotor core and a plurality of magnets (not shown) embedded and fixed in the rotor core. The rotor core is formed by overlapping a plurality of thin annular plate-like rotor core plates in the axial direction. The magnets are permanent magnets, and are disposed at equal intervals in the circumferential direction on the outer circumferential surface side of the rotor core.

Three-phase (U-phase, V-phase, W-phase) ac current is supplied to the stator 14 from an external inverter (not shown), and the stator 14 generates magnetic force for rotating the rotor 12. The stator includes a stator core and a plurality of coils. The stator core is formed by laminating a plurality of thin annular stator core plates in the axial direction. Further, a plurality of teeth, not shown, are arranged radially inward of the stator core at equal intervals in the circumferential direction. A coil 26 is wound around each tooth.

The rotary shaft 16 is formed of a hollow or solid shaft, and is arranged to be rotatable about an axis as a rotation center via a plurality of bearing members 28.

The planetary gear mechanism 18 is a transmission (gear mechanism) that changes the rotational speed of the rotor 12 and outputs the changed rotational speed. The planetary gear mechanism 18 includes a sun gear 30, pinion gears (planetary gears) 32, a ring gear 34, and a carrier 36.

The sun gear 30 is coupled to the rotor 12, which is a magnetic path constituting part, and is rotated integrally with the rotor 12 by receiving a rotational torque from the rotor 12. The sun gear 30 has a substantially U-shaped radial cross section and is supported by a pair of bearings 38 disposed at intervals in the axial direction of the rotary shaft 16 so as to be rotatable independently of the rotary shaft 16.

The pinion gear 32 is composed of a first pinion gear 32a and a second pinion gear 32b which are a pair of pinion gears that mesh with each other (see fig. 2). The first and

second pinion gears

32a and 32b, which are a pair of pinion gears, are axially supported at opposite ends in the axial direction by a pair of side wall portions 40 and 40 (see fig. 1) of the carrier 36, which are opposed to each other and are described later.

The ring gear 34 is externally fitted to the rotary shaft 16 by spline coupling or the like, for example, and rotates integrally with the rotary shaft 16. The ring gear 34 outputs the rotational torque amplified by the planetary gear mechanism 18 to the rotary shaft 16.

The ring gear 34 has a gear portion 42 bent in a substantially L-shaped cross section and meshing with a gear portion of one of the first pinion gears 32a of the pair of pinion gears, i.e., the first pinion gear 32a and the second pinion gear 32 b.

The carrier 36 has: a pair of

side walls

40, 40; an extension portion 46 that is bent from one side wall portion 40 of the pair of

side wall portions

40, 40 and extends to the first clutch mechanism 20; and a branch portion 48 bent from a midway of the extension portion 46 and extending to the second clutch mechanism 22. A bearing 49 is interposed between the branch portion 48 and the ring gear 34. The pair of

side wall portions

40, 40 rotatably support both end portions of the first pinion gear 32a and the second pinion gear 32b, which are a pair of pinion gears. The pair of

side walls

40 and 40 are coupled to face each other by a pair of

cross members

50 and 50 extending substantially parallel to the axis (rotation center) of the rotary shaft 16. In fig. 1, only one of the lateral frame portions 50 is shown, and the other lateral frame portion 50 is not shown.

The first clutch mechanism 20 and the second clutch mechanism 22 have substantially the same structure, and are configured by a known wet multiple disk clutch. The wet multiple disk clutch includes, for example, a piston 52, a clutch plate 53, a counter plate 54, a clutch drum 56, a clutch gear 58, and a return spring 60. The difference is that the return spring 60 is formed of a coil spring in the first clutch mechanism 20, and the return spring 60 is formed of a plate spring in the second clutch mechanism 22.

In the first clutch mechanism 20, the bent outer diameter end of the clutch drum 56 is fixed to the inner wall of the housing 24 by the bolt 62. The second clutch mechanism 22 is coupled and fixed to the rotary shaft 16 via a support portion 35. In the present embodiment, the first clutch mechanism 20 and the second clutch mechanism 22 are configured by wet multi-plate clutches, respectively, but the present invention is not limited to this. For example, the first clutch mechanism 20 and the second clutch mechanism 22 may be configured by clutch hubs, which are not shown, as meshing clutches.

A first hydraulic fluid passage 64 for supplying hydraulic fluid to the piston chamber is formed in the inner wall of the housing 24 near the outer diameter end of the first clutch mechanism 20. A second hydraulic fluid passage 66 for supplying hydraulic fluid to the piston chamber is formed in the rotary shaft 16 near the inner diameter end of the second clutch mechanism 22. The "working oil" is a fluid having both functions of a lubricating oil having a lubricating effect and a refrigerant having a cooling effect.

The first clutch mechanism 20 and the second clutch mechanism 22 operate substantially the same as each other. That is, the piston 52 is pressed by the pressure of the hydraulic oil supplied to the piston chamber through the hydraulic oil passages (the first hydraulic oil passage 64 and the second hydraulic oil passage 66). The piston 52 and the plurality of clutch plates 53 are integrally displaced by the pressing force pressing the piston 52. The plurality of plate-shaped clutch plates 53 are displaced integrally with the piston 52, and thereby the plurality of plate-shaped target plates 54 arranged corresponding to the clutch plates 53 are pressed. Thereby, the plurality of clutch plates 53 are in contact with the plurality of target plates 54, and power is transmitted from the clutch drum 56 connected to the target plates 54 to the clutch gear 58 connected to the clutch plates 53.

A resolver 68 for detecting a rotation angle is disposed on the inner diameter side close to the rotation shaft 16. The resolver 68 includes a resolver stator 68a fixed to the housing 24 and a resolver rotor 68b press-fitted to the rotary shaft 16 and rotating integrally with the rotary shaft 16.

The rotating electric device 10 of the present embodiment is basically configured as described above, and the operational effects thereof will be described next.

Fig. 3 (a) is a block diagram showing a torque transmission path in the case of high torque, fig. 3 (b) is a characteristic diagram showing input/output torque transmitted in the case of fig. 3 (a), fig. 3 (c) is a block diagram showing a torque transmission path in the case of low torque, fig. 3 (d) is a characteristic diagram showing input/output torque transmitted in the case of fig. 3 (c), fig. 4 is a schematic diagram showing a high torque transmission path, and fig. 5 is a schematic diagram showing a low torque transmission path. In the frame diagrams shown in fig. 3 (a) and 3 (c), the pinion gear 32 is depicted as a single gear, but the first pinion gear 32a and the second pinion gear 32b, which are a pair of pinion gears, are meshed with each other as shown in fig. 2.

The rotating electric device 10 is provided so as to be able to switch the first clutch mechanism 20 between on and off (on, off) and the second clutch mechanism 22 between on and off (on, off) in accordance with a required rotation torque (drive torque). Thus, in the present embodiment, the rotational torque (driving torque) can be switched between the high torque (torque T1) and the low torque (torque T2+ torque T3) and output (see fig. 4 and 5 described later). When the rotation torque (driving torque) of the motor is TO, a relationship of T0 < T1 and TO ═ T2+ T3 is established among the torques T0, T1, T2 and T3.

First, a case where a high torque (torque T1) is output will be described. In this case, the first clutch mechanism 20 is applied with force to be in an on state (connected state), and the second clutch mechanism 22 is de-applied to be in an off state (disconnected state) (CL 1; on state, CL 2; off state).

As shown in fig. 3 (a) and 4, the rotational torque derived from the rotor 12 is introduced into the sun gear 30. The rotational torque introduced to the sun gear 30 is introduced into a pair of pinion gears 32, i.e., a first pinion gear 32a and a second pinion gear 32 b. That is, one of the second pinion gears 32b meshing with the gear portion of the sun gear 30 rotates, and the other of the first pinion gears 32a meshing with the one of the second pinion gears 32b rotates. At this time, the extension portion 46 of the carrier 36 connected to the first pinion gear 32a and the second pinion gear 32b, which are a pair of pinion gears, is in a connected state held by the first clutch mechanism 20. Therefore, the carrier 36 is in a rotation stop state.

The first pinion gear 32a and the second pinion gear 32b, which are a pair of pinion gears that mesh with each other, introduce rotational torque into the ring gear 34. As a result, the rotational torque (torque T1) output from the ring gear 34 is transmitted to the rotary shaft 16.

Next, a case where low torque (torque T1+ torque T2) is output will be described. In this case, the first clutch mechanism 20 is de-loaded to be in the closed state (disengaged state), and the second clutch mechanism 22 is loaded to be in the open state (connected state) (CL 1; closed state, CL 2; open state).

As shown in fig. 3 (c) and 5, the rotational torque derived from the rotor 12 is introduced into the sun gear 30. The rotational torque introduced into the sun gear 30 is introduced into the carrier 36 via the pair of pinion gears 32, i.e., the first pinion gear 32a and the second pinion gear 32 b. At this time, the extension portion 46 of the carrier 36 connected to the first pinion gear 32a and the second pinion gear 32b, which are a pair of pinion gears, is in a free state (non-connected state) not held by the first clutch mechanism 20. Since the second clutch mechanism 22 is in the on state, the sun gear 30, the first pinion gear 32a, the second pinion gear 32b, the ring gear 34, and the carrier 36 rotate integrally with each other.

Therefore, the rotational torque derived from the sun gear 30 introduces the torque T2 to the ring gear 34 via the first pinion gear 32a and the second pinion gear 32b, which are a pair of pinion gears. At the same time, the rotational torque derived from the sun gear 30 is derived to the carrier 36, and the torque T3 is further introduced to the ring gear 34 via the carrier 36.

As a result, a low torque (torque T2+ torque T3) is introduced into the ring gear 34, which is a combination of the rotational torque (torque T2) derived from the first and second pinion gears 32a and 32b and the rotational torque (torque T3) derived from the carrier 36. The low torque (torque T2+ torque T3) introduced into the ring gear 34 is transmitted to the rotary shaft 16. In this way, in the present embodiment, the first clutch mechanism 20 and the second clutch mechanism 22 can be easily switched between, for example, a case of low-speed rotation and high torque (torque T1) (see thick solid line in fig. 3 (b)) and a case of high-speed rotation and low torque (torque T2+ torque T3) (see thick broken line in fig. 3 (d)) by the on/off of the mechanisms. The relationship between the torque T1 and the torque T2 is T1 ≠ T2.

In the present embodiment, a single motor is arranged, a pair of pinion gears, i.e., a first pinion gear 32a and a second pinion gear 32b, are assembled to a carrier 36 of the planetary gear mechanism 18, and a first clutch mechanism 20 and a second clutch mechanism 22 are attached, thereby configuring the rotating electric device 10. In the present embodiment, by configuring the rotating electric device 10 with such a simple structure, the rotating electric device 10 can be reduced in size and weight, and can exhibit a torque amplification effect (fig. 3 (a), 3 (b), and 4).

In other words, the rotational torque (drive torque) can be amplified while maintaining the shape and size of the entire transmission as in the conventional case. Therefore, in the present embodiment, the rotating electric device 10 can be directly mounted on a conventional vehicle.

In the present embodiment, the planetary gear mechanism 18, the first clutch mechanism 20, and the second clutch mechanism 22 are disposed in regions other than the rotor 12 that is a magnetic path constituent portion. This enables the space in the housing 24 to be effectively utilized, which contributes to the reduction in size and weight of the rotating electric device 10.

By mounting such a rotating electric device 10 on a vehicle, not shown, it is possible to achieve a vehicle that is compact and lightweight with a simple structure, and that can exhibit a torque amplification effect.

Claims

1. A rotating electric machine device, characterized in that,

the rotating electric device is provided with:

a housing;

a stator around which a coil is wound;

a rotor having a magnet, disposed on an inner diameter side of the stator, and having an inner space portion;

a shaft provided to be rotatable by transmission of a rotational force of the rotor; and

a speed change part for changing the speed of the motor,

the transmission unit includes:

a planetary gear mechanism which is built in the internal space of the rotor, and which has a sun gear, a planetary carrier, and a ring gear;

a first clutch mechanism fixed to the housing and capable of gripping the carrier; and

a second clutch mechanism fixed to the shaft and capable of gripping the carrier,

the sun gear is connected to the rotor and rotates integrally with the rotor,

the ring gear is coupled to the shaft and rotates integrally with the shaft,

the planetary carrier has:

an extension portion that is bent from a side wall portion of the carrier and extends to the first clutch mechanism; and

a branch portion bent from a midway of the extension portion and extending to the second clutch mechanism,

a bearing is interposed between the branch portion and the ring gear,

the transmission unit is provided to be capable of switching between the engagement and disengagement of the first clutch mechanism and the engagement and disengagement of the second clutch mechanism in accordance with a required torque.

2. The rotating electric device according to claim 1,

the planetary gear is composed of a pair of pinion gears that mesh with each other, and the pair of pinion gears are rotatably supported by the planetary carrier,

one of the pair of pinion gears is disposed so as to mesh with the sun gear, and the other pinion gear is disposed so as to mesh with the ring gear.

3. The rotating electric device according to claim 1 or 2,

the planetary gear mechanism, the first clutch mechanism, and the second clutch mechanism are disposed in a region other than a magnetic path constituting portion.

4. A vehicle, characterized in that,

the vehicle is provided with the rotating electric device according to any one of claims 1 to 3.