JP2000289481A - Motor assistance driving device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automotive motor assistance driving device capable of realizing energy regeneration using the rotational force of an axle side even when the motor assistance driving device is composed of a two-way clutch. SOLUTION: An automotive motor assistance driving device for driving an axle only from a starting to a low car speed range by an electric motor is provided with an assistance driving system 14 for transmitting the rotation of the output shaft 10a of an electric motor 10 through a two-way clutch 12 to axles 23a and 23b, a regeneration driving system 17 for transmitting the rotation of each axle through a regeneration clutch mechanism 16 to the output shaft 10a of the electric motor 10, and a regeneration clutch control means for placing the regeneration clutch mechanism 16 in a connected state when a vehicle is in a reduced state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor assist drive system for an automobile in which an axle is driven only in a predetermined operation range by an electric motor. The present invention relates to an apparatus that performs energy regeneration by using rotation.

[0002]

2. Description of the Related Art As a conventional motor assist drive device,
For example, as described in JP-A-9-301002, a worm wheel provided on a rear wheel shaft and a worm provided on a worm shaft are engaged with each other, and a two-way clutch is interposed between the worm shaft and the motor. There is something. In this motor assist device, when the motor is generating rotational torque in the forward direction or the reverse direction, the two-way clutch is in a power transmission state and the rear wheels are driven, and the driving force is reversed from the rear wheel shaft side to the motor side. When the power is transmitted, the two-way clutch is in the power cutoff state, and the reverse transmission of the driving force is prevented.

[0003]

In the case where the above-described motor-assisted driving device is provided, it is conceivable to regenerate energy by utilizing the rotational force of the wheels at the time of deceleration, for example, to charge a battery for an electric motor. Can be In order to achieve such energy regeneration, during traveling without motor assist, the motor is driven to rotate by the rotational force on the wheel side to generate electric power, and the battery is charged by the generated electric power.

However, when a two-way clutch is provided between the motor and the axle as in the motor assisted driving device described in the above-mentioned publication, the motor cannot be rotationally driven by the rotational force of the wheels. Energy regeneration cannot be achieved.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides an automobile that can realize energy regeneration using a rotational force on an axle side even when a motor-assisted driving device is realized by a two-way clutch. It is an object of the present invention to provide a motor assist drive device.

[0006]

According to a first aspect of the present invention, there is provided a motor-assisted driving device for an automobile in which an axle is driven only in a low vehicle speed range from the start by an electric motor. The vehicle is decelerated by an assist drive system that transmits the axle to the output shaft of the electric motor through a regenerative clutch mechanism, and a regenerative drive system that transmits the rotation of the axle to the output shaft of the electric motor via a two-way clutch. And a regenerative clutch control means for setting a connection state when in the state.

According to a second aspect of the present invention, in the first aspect, the regenerative clutch control means includes:
A connection state is established when the vehicle is in a decelerating state and at a first vehicle speed or higher and a second vehicle speed or lower.

Here, the first and second vehicle speeds are set as follows. That is, the first vehicle speed is a vehicle speed higher than the maximum vehicle speed assisted by the assist drive system and has a slight margin. For example, when the maximum assist vehicle speed is 10 km / hr, it is set to about 20 km / hr. The second vehicle speed is set from the maximum allowable regenerative rotation speed of the motor, the speed increase ratio of the regenerative drive system, and the diameter of the wheels. For example, when the speed increase ratio is 1:30 and the wheels are 10 inches, the speed is set to about 80 km / hr.

[0009]

According to the first aspect of the present invention, in addition to the assist drive system for transmitting the rotation of the electric motor to the axle via the two-way clutch, the rotation of the axle is electrically bypassed through the two-way clutch. Since the regenerative drive system for transmitting to the motor is provided, the rotation of the electric motor is transmitted to the axle via the two-way clutch at the time of starting or the like, and the motor assist is realized without any trouble. When the vehicle is in a normal traveling state where the motor assist operation is not performed, when the vehicle is in a deceleration state, the regenerative clutch mechanism connects the regenerative drive system, and the rotational force of the wheels is transmitted to the electric motor bypassing the 2-way clutch, Electric power is generated by the motor, and energy regeneration can be realized while having a two-way clutch.

According to the second aspect of the present invention, the regenerative clutch mechanism is connected only in a driving range where the vehicle is in a deceleration state and is equal to or higher than the first vehicle speed and equal to or lower than the second vehicle speed. By setting the first and second vehicle speeds, an excessive load can be prevented from being applied to the electric motor during the regenerative operation, and both the motor assist and the energy regeneration can be performed more reliably.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 3 are views for explaining a motor assisted driving apparatus for an automobile according to an embodiment of the present invention. FIG. 1 is a schematic configuration diagram of an automobile provided with the motor assisted driving apparatus, and FIG. FIG. 3 is a schematic structural view of the device, and FIG. 3 is a cross-sectional developed view of the motor assist drive device.

In FIG. 1, reference numeral 1 denotes an automobile provided with a motor assist drive device 9 according to the present embodiment. The car 1
Left and right front wheels 2 and 3 are provided at the front of the vehicle body, and left and right rear wheels 4 and 5 are provided at the rear. The driving force of the engine 6 mounted on the front of the vehicle body is transmitted to the left and right front wheels 2 and 3 by the transmission 7, the front differential 8 and the left and right front wheel shafts 34a,
34b. The left and right rear wheels 4,
5, the motor driving force of the motor assist drive device 9 is transmitted via the rear wheel shafts 23a and 23b only in a predetermined operation range.

The motor-assisted driving device 9 reduces the driving force of the electric motor 10 by a reduction mechanism 11 and a two-way clutch 1.
2, an assist drive system configured to transmit to the rear wheels 4 and 5 while decelerating via the rear differential 13 and the left and right rear wheel shafts 23a and 23b, and particularly to assist the rear wheels 4 and 5 during a start operation. 14 is provided. The reduction ratio of the assist drive system is determined by the motor speed, the vehicle speed and the wheel diameter to be assisted, and in the case of the present embodiment, 1:
It is set to 100.

Further, the motor-assisted driving device 9 of the present embodiment controls the rotation of the rear wheels 4 and 5 to the left and right rear wheel shafts 23a,
23b, the rear differential 13, the speed increasing mechanism 15, and the regenerative clutch mechanism 16, the speed is increased and transmitted to the electric motor 10,
In particular, a regenerative drive system 17 is provided which performs energy regeneration when the vehicle is in a decelerating state and is equal to or higher than the first vehicle speed and equal to or lower than the second vehicle speed. The speed increase ratio of the regenerative drive system 17 is determined by the allowable regenerative rotation speed of the motor, the vehicle speed at which energy is to be regenerated, the wheel diameter, and the like. In the case of the present embodiment, it is set to 1:30.

A battery 18 serving as a power source of the electric motor 10 is constantly charged by the engine 6 during traveling, and the amount of power supplied to the electric motor 10 is controlled by a control unit 19. The control unit 19
Signals indicating various vehicle operating conditions such as accelerator opening, engine speed, vehicle speed, etc. are input, and function as motor control means for controlling the amount of power supplied to the electric motor 10 based on the operating condition signals. Specifically, when the vehicle is in a predetermined low vehicle speed range (for example, 0 to 10 km / hr) from the starting state based on the accelerator opening, the vehicle speed, the brake switch, and the like, the assist driving force corresponding to the driving state is reduced. The amount of power supplied to the electric motor 10 is controlled so as to generate power.

The control unit 19 determines whether the vehicle is in a deceleration state based on a brake switch signal indicating that the brake is depressed, a G sensor signal indicating an acceleration / deceleration state, or a fuel cut signal. A regenerative clutch which also functions as a deceleration state detecting means for judging and controls whether the regenerative operation is executed or stopped by controlling the regenerative clutch mechanism 16 to be switched to a connected state or a disconnected state via an actuator (not shown). It also functions as control means.

Specifically, the regenerative clutch mechanism 16 is
The connection state is established when the vehicle is in a deceleration state and is equal to or higher than the first vehicle speed and equal to or lower than the second vehicle speed, for example, 20 to 80 km / hr, and is shut off in other driving ranges. When the regenerative clutch mechanism 16 is in the connected state, the rear differential 1
The rotation of the motor 3 is accelerated at a predetermined speed increase ratio and transmitted to the electric motor 10, whereby the electric motor 10 operates as a generator to perform energy regeneration and charge the battery 18. The rotation of the rear differential 13 is interrupted by the two-way clutch 12, and the rotation of the wheels is not transmitted back to the assist drive system 14. The minimum speed (first vehicle speed) for performing the regenerative operation is 20 km / h as a speed slightly higher than the maximum speed 10 km / hr during the assist.
hr. The maximum speed (second vehicle speed) when performing the regenerative operation is 80 km from the allowable regenerative rotation speed of the electric motor 10, the speed increase ratio, and the diameter of the rear wheels 4 and 5.
/ Hr.

In FIG. 3, the motor-assist drive device 9 is provided mainly on the first case 20a side of a casing 20 fixed to a vehicle body frame.
The regenerative drive system 17 is provided mainly on the second case 20b side.
Has a schematic structure in which is accommodated. The intermediate case 2 disposed at the boundary between the first and second cases 20a and 20b.
0c supports the bearing of each shaft.

The speed reduction mechanism 1 of the assist drive system 14
1, an input shaft 21 and an intermediate shaft 22 are arranged in the first case 20a in parallel with the rear wheel shafts 23a and 23b, and both ends are rotatably supported by bearings 34a and 34a. The drive gear 10b of the output shaft 10a of the electric motor 10 attached to the rear side is meshed with the large-diameter input gear 21a of the input shaft 21, and the small-diameter output gear 21b of the input shaft 21 is Diameter input gear 22a
, And a small-diameter output gear 22 b of the intermediate shaft 22 is meshed with a differential gear 24.

The two-way clutch 12 is of a well-known switching plate type interposed between the differential gear 24 and the differential case 25. The two-way clutch 12 has positive and negative rotations of the differential gear 24.
Both the reverse rotation is transmitted to the differential case 25 and the differential case 2
Regarding the rotation of No. 5, neither forward nor reverse rotation is transmitted to the differential gear 24.

Further, the rear differential 13 includes a pair of differential large gears 26, 26 fixed to the left and right rear wheel shafts 23a, 23b in a differential case 25, and a differential case 25.
And a pair of differential small gears 28 which are loosely fitted to a gear shaft 27 fixed to a pin and meshed with the differential large gear 26. The differential case 25 includes a bearing 34b,
34b, the first case 20a and the intermediate case 2
It is rotatably supported by 0c.

The speed increasing mechanism 15 of the regenerative drive system 17
Converts the output gear 29 fixed to the rotary cylinder portion 25a of the differential case 25 to the intermediate gear 31a fixed to the outer end of one of two split shafts 30a arranged in parallel with the rear wheel shafts 23a and 23b. Mesh with the other clutch shaft 30
The electric motor 10 has a structure in which an intermediate gear 31b fixed to an outer end of the electric motor 10 is meshed with an input gear 10c provided on an output shaft 10a of the electric motor 10.

Further, the regenerative clutch mechanism 16 connects the clutch gears 32a and 32b of the one and the other clutch shafts 30a and 30b which are opposed to each other by sliding the sleeve 33 in the axial direction with an actuator (not shown). Alternatively, it is of a sleeve switching type configured to be separated. The regenerative clutch mechanism may have various structures, and may be, for example, an electromagnetic clutch. The control unit 19 also functions as a regenerative clutch control unit that moves the sleeve 33 to the connection position or the separation position via the actuator.

Next, the operation and operation and effect of the present embodiment will be described. In the motor assist drive device 9 of the present embodiment, for example, in a low vehicle speed range of 10 Km / hr from the start, the control unit 19 causes the regenerative clutch mechanism 16 to be in the disengaged state (disconnected state) via the actuator, The motor 10 is started and controlled to a predetermined rotation speed. Then, the rotation of the electric motor 10 is controlled by the motor output shaft 10a, the input shaft 21, the intermediate shaft 22, the differential gear 24, the two-way clutch 12, the rear differential 13, and the left and right rear wheel shafts 2.
The gears are transmitted to the left and right rear wheels 4 and 5 at a predetermined reduction ratio via 3a and 23b. In this way, the assist driving force is transmitted to the left and right rear wheels 4, 5, and a smooth start can be achieved. The same applies to the case of reverse travel.

When the vehicle speed exceeds 10 km / hr, the power supply to the electric motor 10 is stopped, and the supply of the assist driving force is stopped. During such normal running, the rotational force of the rear wheels 4 and 5 is transmitted to the assist drive system 14 in reverse, but the differential case 25 of the rear differential 13
Two-way clutch 1 disposed between the gear and the differential gear 24
2 is disengaged, and no rotational force is transmitted in the reverse direction.

On the other hand, the control unit 19 determines that the vehicle is in a decelerating state by an input from the acceleration / deceleration detecting G sensor, a vehicle speed sensor, and the like, and has a predetermined vehicle speed range (20 to 80 km / h).
r), the regenerative clutch mechanism 16 is switched to the connected state via the actuator. Then, the rotation of the rear wheels 4 and 5 is changed to the left and right rear wheel shafts 23.
a, 23b, the rear differential 13, the speed increasing mechanism 15, and the regenerative clutch mechanism 16, the speed is increased at a predetermined speed increasing ratio and transmitted to the output shaft 10a of the electric motor 10. As a result, the electric motor 10 operates as a generator, and the battery 18 is charged with the generated electric power.

As described above, in this embodiment, the differential case 2
Since the two-way clutch 12 is interposed between the gear 5 and the differential gear 24 to form the assist drive system 14, the assist drive force can be supplied to the rear wheels 4 and 5 by the electric motor 10 in any of forward and reverse travels. In addition, reverse transmission of rotational force from the rear wheel side can be prevented, and motor assist can be realized without any trouble.

On the other hand, a regenerative drive system 17 is provided separately from the assist drive system 14, and a regenerative clutch mechanism 16 for connecting the regenerative drive system 17 only when the vehicle is in a deceleration state and within a predetermined vehicle speed range. With the provision, energy regeneration utilizing the rotation of the wheels can be realized during normal traveling, and the battery 18 which is the power source of the electric motor 10 for assist drive can be charged with energy generated during braking or the like.

In the first embodiment, the electric motor 10 is driven by taking out the rotation of the differential case 25 of the rear differential 13 in a predetermined operation range in a deceleration state.
The position where the rotational force is extracted is not limited to the above example. In short, the rotation may be taken out from between the two-way clutch and the axle of the assist drive system. For example, as shown in FIG. 4, the rotation of one axle 23b may be taken out.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an automobile provided with a motor assist drive device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of the embodiment device.

FIG. 3 is a cross-sectional developed view of the device of the embodiment.

FIG. 4 is a schematic configuration diagram of a motor assist drive device according to a modified example of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 9 Motor assist drive device 10 Electric motor 10a Output shaft 12 2-way clutch 14 Assist drive system 16 Regenerative clutch mechanism 17 Regenerative drive system 19 Control unit (regenerative clutch control means) 23a, 23b Left and right rear wheel axles

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3D043 AA02 AA05 AB01 AB17 EA02 EA05 EA11 EA35 EA42 EB03 EB07 EB12 EB13 EE06 EE09 EF02 EF09 EF12 EF17 EF21 5H115 PI16 PI29 PO17 PU01 PU22 PU25 QE10 Q0104

Claims (2)

[Claims] 1. A motor-assisted driving device for an automobile in which an axle is driven only in a low vehicle speed range from a start by an electric motor, wherein rotation of an output shaft of the electric motor is transmitted to the axle via a two-way clutch. An assist drive system, a regenerative drive system for transmitting rotation of the axle to an output shaft of the electric motor via a regenerative clutch mechanism, and a regenerative clutch for connecting the regenerative clutch mechanism to the vehicle when the vehicle is in a deceleration state A motor-assisted driving device for an automobile, comprising: a control unit. 2. The vehicle according to claim 1, wherein the regenerative clutch control means sets the regenerative clutch mechanism to a connected state when the vehicle is in a decelerating state and at a first vehicle speed or higher and a second vehicle speed or lower. Motor assist drive device.