JP4337018B2 - VEHICLE DRIVE DEVICE HAVING CRANKSHAFT DIRECTLY CONNECTED ROTARY ELECTRIC - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle drive device having a crankshaft direct-coupled rotating electrical machine.
[0002]
[Prior art]
A conventional hydraulically driven vehicle mechanical clutch includes a flywheel fixed to a rear end portion of a crankshaft, and an input shaft of a reduction gear mechanism extending rearward through the flywheel coaxially with the crankshaft. And a torque transmission / cutting mechanism for connecting the two and the clutch plate, having a clutch plate, a pressure plate, a clutch spring, and a hydraulic release mechanism arranged in order from the rear end face of the flywheel.
[0003]
The hydraulic release mechanism is fixed to the partition wall of the housing that partitions the reduction gear chamber and the clutch chamber, and is loosely fitted to the input shaft of the reduction gear mechanism, and is axially slid to the sleeve cylinder adjacent to the axial direction. A release piston and a release bearing are freely fitted.
[0004]
The pressure plate supported on the flywheel through the clutch cover is normally urged by a clutch spring to press the clutch plate against the rear end surface of the flywheel, thereby mechanically coupled to the flywheel.
[0005]
When the release piston is hydraulically driven forward, the release piston advances the release bearing in front of the release piston, the release bearing attenuates the urging force of the clutch spring against the pressure plate, and the pressure plate causes frictional connection between the clutch plate and the flywheel. To release.
[0006]
Conventionally, a rotating electrical machine directly connected to a flywheel has been proposed for starting and power generation of an internal combustion engine, as well as regenerative braking and torque assist.
[0007]
[Problems to be solved by the invention]
The above-described flywheel-fixed rotating electric machine (hereinafter also referred to as a crankshaft direct-coupled rotating electric machine) is disposed on the front end side of the flywheel because the rear end surface of the flywheel contacts and separates from the clutch plate of the mechanical clutch. I must.
[0008]
As a result, in the conventional vehicle drive device with a built-in hydraulically driven friction clutch, when the rotating electrical machine is provided on the flywheel, the axial length of the power train, especially the input shaft length of the reduction gear mechanism, increases by the amount of the rotating electrical machine. There has been a problem that the power train, that is, the vehicle drive device, is increased in size and weight, and the rigidity against vibration is reduced, making it difficult to put it to practical use.
[0009]
For this reason, normally, a rotating electric machine such as an alternator or a starter is arranged on the side of the front end portion of the crankshaft to drive the belt. However, such a front arrangement belt drive system is not suitable for a large-capacity rotating electrical machine in terms of conduction loss, loss, or reliability.
[0010]
The present invention has been made in view of the above-described problems, and is a vehicle drive having a crankshaft direct-coupled rotary electric machine excellent in practicality by suppressing the increase in size and weight of the powertrain, that is, the vehicle drive device, and the decrease in rigidity against vibration. The purpose is to provide a device.
[0011]
[Means for Solving the Problems]
The vehicle drive device having a crankshaft direct-coupled rotating electric machine according to claim 1 that solves the above-described problem, a flywheel fixed to a rear end portion of the crankshaft, and a fixed position to a housing that is positioned in a cylindrical portion of the flywheel. And a rotating electric machine having a rotor fixed to the flywheel and having a rotor facing the circumferential surface of the stator, and extending rearwardly through the cylindrical portion of the flywheel coaxially with the crankshaft. A mechanical clutch that frictionally connects the input shaft of the reduction gear to the flywheel;
The mechanical clutch is supported by the flywheel so as to be relatively non-rotatable in the axial direction, and is opposed to the rear end surface of the wheel plate portion of the flywheel with a predetermined interval, and is relatively rotated with respect to the input shaft. A clutch plate that is supported so as to be displaceable and axially displaceable and interposed between a rear end surface of the flywheel and a front end surface of the pressure plate, and is supported by the flywheel located behind the pressure plate. A ring-shaped clutch spring whose outer peripheral portion urges the rear end surface of the pressure plate forward, and is fitted to the input shaft with a predetermined distance from the outer peripheral surface of the input shaft, and is rearward of the clutch plate. And a sleeve cylinder whose rear end is fixed to the housing, and an outer peripheral surface of the sleeve cylinder A release piston that is slidably fitted in the axial direction, and a displacement piston that is fitted to the release piston or the sleeve cylinder and is displaced together with the release piston in the axial direction so that the inner peripheral portion of the clutch spring is axially moved. In a vehicle drive device having a crankshaft direct-coupled rotary electric machine having a release bearing for biasing,
The flywheel has a front end portion fastened to the rear end of the crankshaft, and a small-diameter cylindrical portion, and extends from the rear end of the cylindrical portion in a substantially centrifugal direction so as to face and separate from the clutch plate. The clutch plate has a recessed portion with a rear end opening capable of accommodating a part or all of the release bearing, and is supported by the input shaft so as not to be relatively rotatable and to be axially displaceable. A cylindrical portion, and a ring plate portion extending between a rear end surface of the flywheel and a front end surface of the pressure plate from an axial rear portion of the cylindrical portion, and at least a part of the release piston; The release bearing is arranged in front of the clutch spring.
[0012]
In other words, in this configuration, instead of pressing the clutch spring forward by the hydraulic release mechanism (release bearing, release piston and sleeve cylinder) disposed behind the clutch spring, the release piston and release bearing are disengaged. Is arranged in front of the clutch spring, and the clutch is disengaged by pulling the clutch spring forward by the release bearing.
[0013]
In this case, the clutch plate prevents the release piston and the release bearing from being arranged in front of the clutch spring. However, in this configuration, only the small-diameter portion of the clutch plate protrudes forward to form a recess. This problem is solved by allowing the release bearing and release piston to enter.
[0014]
Furthermore, in order to make the small diameter part of the clutch plate protrude forward, the flywheel is in the way, but in this configuration, the rotating electrical machine is fixed to the flywheel, so the rotor of the rotating electrical machine is directly fixed to the crankshaft. Therefore, since the member for fixing the rotor of the rotating electric machine to the crankshaft is not required, the flywheel is formed in a substantially flange shape by utilizing the ring shape, and the rear end opening of the flywheel is formed. At least a part of the small-diameter portion protruding forward of the clutch plate is accommodated in the cylindrical portion, that is, inside the diameter of the rotating electrical machine.
[0015]
As a result, crankshafts with superior vibration resistance, economy, and practicality can be prevented by suppressing the increase and increase in shaft length, weight, and physique compared to conventional vehicle clutch built-in vehicle drive devices (powertrain). A vehicle drive device having a direct-coupled rotating electrical machine can be realized.
[0016]
The crankshaft direct-coupled rotary electric machine in this specification means a rotary electric machine that is fixed to the crankshaft through a flywheel. Naturally, another member having a flywheel effect in addition to this flywheel. May be provided on the crankshaft.
[0017]
According to a second aspect of the present invention, in the vehicle drive device having the crankshaft direct-coupled rotating electric machine according to the first aspect, the release bearing is fitted to the release piston.
[0018]
According to this configuration, since the release bearing and the release piston overlap in the axial direction, the axial length of the power train can be further shortened by the required axial dimension of the release bearing, and the effect of claim 1 is further improved. be able to.
[0019]
Also, since the release bearing does not face the clutch plate across the release piston, the axial dimension between the release bearing (especially its outer ring) and the small diameter portion of the clutch plate is shortened (preferably It becomes easy to pull the clutch plate forward by the release bearing.
[0020]
According to a third aspect of the present invention, in the vehicle drive device having the crankshaft direct-coupled rotary electric machine according to the second aspect, the clutch plate is positioned between the cylindrical portion and the wheel plate portion to absorb torque fluctuations. And a front portion of the clutch damper is housed in a cutout portion formed by cutting out a rear end portion of the cylindrical portion of the flywheel.
[0021]
According to this configuration, the clutch damper having a large axial dimension in the clutch plate can be accommodated in the notch portion of the flywheel, so that the axial distance between the cylinder portion of the clutch plate and the clutch damper can be further increased. It can be shortened.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a vehicular rotating electrical machine of the present invention will be described below with reference to the drawings.
[0023]
【Example】
An embodiment in which the vehicular rotating electrical machine of the present invention is applied to an internal combustion engine driven vehicle will be described below.
[0024]
(Overall structure)
FIG. 1 is an axial sectional view showing the vicinity of a flywheel and a clutch of a vehicle drive device (powertrain) for this internal combustion engine driven vehicle, and FIG. 2 is a partially enlarged sectional view thereof.
[0025]
1 is a crankshaft of an engine (internal combustion engine), 2 is a flywheel, 3 is a housing, 4 is a mechanical clutch, 5 is a rotating electrical machine, and 6 is a reduction gear mechanism (not shown) having an axis that coincides with the crankshaft 1. )).
[0026]
The flywheel 2 is fixed to the crankshaft 1, and the front end portion of the input shaft 6 passes through the flywheel 2 in the axial direction and is rotatably supported on the rear end portion of the crankshaft 1 by a bearing 7. The clutch 4 is fitted on the input shaft 6, and the rotating electrical machine 5 is disposed on the front side of the flywheel 2.
[0027]
(Description of flywheel 2)
The flywheel 2 is fitted to the rear end of the crankshaft 1 and fastened with bolts. The flywheel 2 includes a small-diameter cylindrical part 21 whose front end wall is fastened to the rear end of the crankshaft, a ring plate part 22 extending in a centrifugal direction from the rear end of the cylindrical part 21, A large-diameter cylindrical portion 23 extending axially forward from the outer peripheral portion. Reference numeral 24 denotes a recess in the rear end opening existing in the cylindrical portion 21, and reference numeral 25 denotes a cutout portion formed by cutting out the rear end portion of the cylindrical portion 21 of the flywheel 2.
(Description of mechanical clutch 4)
The mechanical clutch 4 includes a clutch plate 41, a pressure plate 42, a clutch spring 43, a clutch cover 44, and a hydraulic release mechanism 45.
[0028]
The clutch plate 41 has a concave portion 410 having a rear end opening and is supported by the input shaft 6 so as not to be rotatable relative to the input shaft 6 and to be axially displaceable, and the flywheel 2 from the axial rear portion of the cylindrical portion 411. A ring plate portion 412 extending along the rear end surface, and a clutch damper 413 for absorbing torque fluctuation that is disposed between the tubular portion 411 and the ring plate portion 412 and connects the two. The wheel plate portion 412 has a friction wheel plate member 414 that can contact the rear end surface of the flywheel 2. The clutch damper 413 is a rubber member or a coil spring extending in the circumferential direction. One end of the clutch damper 413 is in contact with the cylindrical portion 411 and the other end is in contact with the wheel plate portion 412. It is a member that absorbs it. The front portion of the clutch damper 413 is accommodated in a notch portion 25 formed by notching the rear end portion of the cylindrical portion 21 of the flywheel 2.
[0029]
The pressure plate 42 has a ring plate shape and is disposed in contact with the rear end surface of the clutch plate 41, and the outer peripheral portion of the pressure plate 42 is supported by a clutch cover 44 fixed to the outer peripheral portion of the flywheel 2. Yes.
[0030]
The clutch spring 43 is a ring-shaped spring member that can be elastically deformed in the axial direction, and has an outer peripheral portion that is in close contact with the rear end surface of the pressure plate 42 and a substantially central portion in the radial direction that is locked to the clutch cover 44. The portion is locked to a later-described hydraulic release mechanism 45 so that it cannot be displaced backward. In a normal state, the clutch spring 43 is elastically deformed in the axial direction, and the clutch plate 41 is pressed against the rear end surface of the flywheel 2 through the pressure plate 42 to bring the mechanical clutch 4 into a connected state.
[0031]
The hydraulic release mechanism 45 is fixed to the partition wall 30 of the housing 3 that divides the reduction gear chamber and the clutch chamber and is loosely fitted to the input shaft 6 of the reduction gear mechanism. The hydraulic release mechanism 45 slides in the axial direction on the sleeve cylinder 451. A release piston 452 that is freely fitted and a release bearing 453 that is fitted to the release piston 452 are provided. A hydraulic chamber 454 is provided between the sleeve cylinder 451 and the release piston 452. The outer ring of the release bearing 453 is locked to the inner peripheral portion of the clutch spring 43.
[0032]
(Description of clutch contact / separation operation)
By introducing the pressure oil into the hydraulic chamber 454, the release piston 452 and the release bearing 453 in which the inner ring is press-fitted to the release piston 452 move forward, and the outer ring of the release bearing 453 moves forward on the inner peripheral portion of the clutch spring 43. This causes the outer periphery of the clutch spring 43 to retreat. Since the outer peripheral portion of the pressure plate 42 is locked to the outer peripheral portion of the clutch spring 43, the pressure plate 42 also moves backward, the pressing force between the clutch plate 41, the flywheel 2 and the pressure plate 42 disappears, and the mechanical clutch 4 is dissociated. The flywheel 2 is separated from the input shaft 6 by the disengagement of the mechanical clutch 4.
[0033]
By releasing the pressure oil from the hydraulic chamber 454 of the hydraulic release mechanism 45, the mechanical clutch 4 is connected by the reverse operation. The structure and operation of the mechanical clutch 4 are essentially the same as those of the hydraulic release mechanism 45 except for the structure.
[0034]
(Configuration of rotating electrical machine 5)
The rotating electrical machine 5 includes an inner rotor portion 51 fixed to the outer peripheral surface of the small diameter cylindrical portion 21 of the flywheel 2 and an outer rotor portion fixed to the inner peripheral surface of the large diameter cylindrical portion 23 of the flywheel 2. 52, a stator 53 fixed to a housing (not shown) and disposed between the inner rotor portion 51 and the outer rotor portion 52. The inner rotor portion 51 has a permanent magnet 512 fixed to a yoke 511, the outer rotor portion 52 has a permanent magnet 522 fixed to a yoke 521, and a stator 53 has an armature coil attached to an iron core 531 fixed to the housing 3. Concentrated winding 532. By energizing the armature coil 532, the flywheel 2 is driven through the rotors 51 and 52, and the crankshaft 1 is driven. Conversely, the crankshaft 1 drives the rotors 51 and 52, and the armature coil 532 generates power.
(Effect of Example)
In the vehicle drive apparatus having the crankshaft direct-coupled rotary electric machine according to the present embodiment described above, the conventional mechanical clutch built-in vehicle drive apparatus (power), despite the fact that the rotary electric machine 5 is mounted on the flywheel 2. The increase in shaft length, weight, and physique can be suppressed relative to the train.
[0035]
This is because the release piston 452 and the release bearing 453 replace the conventional clutch disengagement mechanism in which the clutch spring 43 is pressed forward by the release bearing 453 of the hydraulic release mechanism 45 disposed behind the clutch spring 43. Is disposed in front of the clutch spring 43, and the clutch spring 43 is pulled forward by the release bearing 452 to disengage the clutch, so that the hydraulic release mechanism that is long in the axial direction is accommodated behind the clutch spring 43. This is because the space is omitted.
[0036]
However, in order to dispose the release piston 452 and the release bearing 453 in front of the clutch spring 43, the clutch plate 41 is provided with a cylindrical portion 411, and the release piston 452 and the release piston 452 and the release piston 452 are formed in the recessed portion of the rear end opening of the cylindrical portion 411. The bearing 453 is accommodated. In addition, in order to project the cylindrical portion 411 of the clutch plate 41 forward, the cylindrical portion 22 of the flywheel 2 enters the radially inner side of the rotating electrical machine 5, and the cylindrical shape of the clutch plate 41 is inside this cylindrical portion 22. A structure in which the portion 411 enters is employed.
[0037]
Further, in this configuration, since the release bearing 453 is fitted to the release piston 452, the axial length of the power train can be further shortened by the required axial dimension of the release bearing 453.
[0038]
Furthermore, since the release bearing 453 does not face the clutch plate 41 across the release piston 452, the required axial dimension between the outer ring of the release bearing 453 and the inner peripheral portion of the clutch plate 41 can be shortened. Pulling the pressure plate 42 forward by the release bearing 453 is facilitated, and the pressing force of the clutch plate 41 can be reduced.
[Brief description of the drawings]
FIG. 1 is an axial sectional view of a vehicle drive device having a crankshaft direct-coupled rotating electrical machine according to a first embodiment.
FIG. 2 is a partially enlarged cross-sectional view of FIG.
[Explanation of symbols]
1 Crankshaft 2 Flywheel 3 Housing 4 Mechanical clutch 5 Rotating electrical machine 6 Input shaft 41 Clutch plate 42 Pressure plate 43 Clutch spring 44 Clutch cover
45 Hydraulic release mechanism 451 Sleeve cylinder 452 Release piston 453 Release bearing

Claims (3)

A flywheel fixed to the rear end of the crankshaft;
A stator positioned in the cylindrical portion of the flywheel and fixed to the housing; and a rotating electric machine having a rotor fixed to the flywheel and facing the circumferential surface of the stator;
A mechanical clutch that frictionally connects an input shaft of a reduction gear that extends rearward through the cylinder portion of the flywheel coaxially with the crankshaft, and the flywheel;
With
The mechanical clutch is
A pressure plate supported by the flywheel so as to be relatively non-rotatable in the axial direction and facing the rear end surface of the wheel plate portion of the flywheel at a predetermined interval;
A clutch plate that is supported by the input shaft so as not to rotate relative to the input shaft and is capable of axial relative displacement, and is interposed between a rear end surface of the flywheel and a front end surface of the pressure plate;
A ring-shaped clutch spring which is positioned behind the pressure plate and supported by the flywheel and whose outer peripheral portion urges the rear end surface of the pressure plate forward;
A sleeve cylinder that is fitted to the input shaft with a predetermined distance from the outer peripheral surface of the input shaft and is positioned behind the clutch plate and whose rear end is fixed to the housing;
A release piston fitted to the outer peripheral surface of the sleeve cylinder so as to be axially slidable; and
A release bearing which is fitted to the release piston or the sleeve cylinder and is axially displaced integrally with the release piston to urge the inner periphery of the clutch spring in the axial direction;
In a vehicle drive device having a crankshaft direct-coupled rotary electric machine comprising:
The flywheel has a front end portion fastened to the rear end of the crankshaft, and a small-diameter cylindrical portion, and extends from the rear end of the cylindrical portion in a substantially centrifugal direction so as to face and separate from the clutch plate. Having a ring plate part,
The clutch plate has a recessed portion having a rear end opening capable of accommodating a part or all of the release bearing, and is supported by the input shaft so as not to rotate relative to the input shaft and to be axially displaceable. A ring plate portion extending between the rear end surface of the flywheel and the front end surface of the pressure plate from the axial rear portion of the shape portion,
At least a part of the release piston and the release bearing are disposed in front of the clutch spring, and the vehicle drive device has a crankshaft direct-coupled rotating electrical machine. In the vehicle drive device having the crankshaft direct-coupled rotary electric machine according to claim 1,
A vehicle drive apparatus having a crankshaft direct-coupled rotary electric machine, wherein the release bearing is fitted to the release piston. In the vehicle drive device having the crankshaft direct-coupled rotary electric machine according to claim 2,
The clutch plate has a clutch damper for absorbing torque fluctuation located between the tubular portion and the wheel plate portion,
A vehicle drive device having a crankshaft direct-coupled rotating electrical machine, wherein a front portion of the clutch damper is housed in a cutout portion formed by cutting out a rear end portion of a cylindrical portion of the flywheel.

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