JPS62227813A - Wheel driver - Google Patents

Abstract

PURPOSE:To make driving force directly transmittable to wheels as well as to reduce a transfer loss, by installing a rotor of an electric motor on an axle in a vehicle mounting an exhaust energy recoverer, while attaching a stator to the body side. CONSTITUTION:An electric motor 2 is installed in the circumference of an axle 1 receiving driving force from an engine serving as a power source and driving wheels, and a cage rotor (a cage coil) 21 or the rotor is directly attached to the circumference of the axle 1. And, a stator 22 corresponding to this rotor 21 is attached to a motor cover 23 which, in turn, is attached to a chassis 3 by a torsion preventing guide 24a expanding or contacting in the length direction and a holding mechanism 24 consisting of a spring 24b. And, stator winding 25 coming to an induction machine by means of assembly with the rotor 21 is installed in the stator 22, making it function as an induction motor by the feed of an alternating current of the specified frequency, while at the time of car braking, it is made to function as the induction motor performing power generation by the braking force.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wheel drive device installed in a vehicle equipped with an exhaust energy recovery device that regenerates engine exhaust energy as electric power.

(Prior Art) In recent years, heat-insulating engines have been developed that use ceramics for the outer wall of the exhaust manifold, cylinder liner, cylinder head heat-insulating plate, piston, etc. of internal combustion engines.

According to this type of engine, there is no need to dissipate the heat generated inside the engine to cool the engine, and the generated high temperature exhaust gas (7) has no effect. Energy can be regenerated and returned to the engine's output shaft, which can be used to improve engine output.

Then, a generator driven by a turbocharger attached to the exhaust pipe is provided as an energy recovery device, and a separate generator driven by a submerged exhaust turbine is installed in the exhaust gas of the turbocharger. Furthermore, an electric motor is provided on the drive shaft of the vehicle, and the two types of generators mentioned above are controlled according to the operating state of the engine, and the generated power is used to drive the electric motor to assist the running force of the vehicle. A proposal is shown in Japanese Patent Application No. 60-233938.

On the other hand, as a driving device for the wheels of the driven wheel using an electric motor, an inner gear is installed around the periphery of the hub portion of the wheel.

Japanese Patent Application Laid-Open No. 47-258 proposes that the rotational force of the electric motor be transmitted to the wheels by driving the electric motor using a pinion provided on its rotating shaft.
It is disclosed in Publication No. 34.

(Problems to be Solved by the Invention) In the former proposal of an exhaust energy recovery device shown in Japanese Patent Application No. 60-233938, the exhaust energy is converted into electric energy to drive an electric motor installed on the axle. Although efforts are being made to recover energy, there is a lack of concrete measures to attach an electric motor to the drive shaft of an actual vehicle.

In addition, in the latter proposal shown in Japanese Patent Laid-Open No. 47-25834 as a drive device for automobile wheels using an electric motor, the output of the electric motor is transmitted to the wheels via a gear mechanism consisting of a pinion and an inner gear. This gear mechanism has the drawback of transmission losses and the problem of requiring a separate power source to supply the motor.

The present invention has been made in view of these problems,
The purpose is to provide a wheel drive device that directly applies driving force to the wheels without using a gear mechanism.

(Means for Solving Problems) According to the present invention, the rotor of the electric motor is provided on the axle that drives the wheels, and the stator side is attached to the vehicle body by a holding mechanism, and electric power is supplied to the electric motor to drive the wheels. A driving wheel drive is provided.

Further, according to the present invention, there is provided a wheel drive device in which the electric motor is attached to a vehicle body using a holding mechanism that absorbs vibrations.

(Function) According to the present invention, the electric power recovered by the exhaust energy recovery device is supplied to the electric motor provided on the drive shaft of the wheel, so the driving force is directly applied to the wheel without using a gear mechanism or the like as an intermediary. The holding mechanism has an elastic force of 1, and has the effect of absorbing vibrations of the axle.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a sectional view showing an embodiment of a wheel drive device according to the present invention, and FIG. 2 is a block diagram showing the configuration of the system of this embodiment.

In FIG. 1, reference numeral 1 denotes an axle, which receives driving force from an engine serving as a power source and drives the wheels, and the left direction in the figure shows the disk wheel side of the wheels.

In addition, 11 is a Barfield type joint, and 1
2 is a boot that covers the engagement portion between the joint 11 and the axle 1.

Reference numeral 2 denotes an electric motor provided on the outer periphery of the axle 1, and a cage-shaped rotor 21 serving as its rotor forms a cage-shaped coil and is directly attached to the outer periphery of the axle 1, as shown in the cross-sectional view of FIG. 1(B). , a stator 22 corresponding to the cage-shaped rotor 21 is attached to a motor cover 23. The stator 22 is attached to the chassis 3 by a holding mechanism 24 so as not to rotate as the axle 1 rotates.

The stator 22 has a stator winding 25 that becomes an induction motor when assembled with the cage-shaped rotor 21, and when supplied with alternating current at a predetermined frequency, it becomes an induction motor, and when the vehicle is braked, the induction motor generates electricity using the braking force. l! It is configured to be a machine.

Further, the holding mechanism 24 has a breakage prevention guide 24a that expands and contracts in the length direction and a spring 24b, and absorbs vibrations of the axle 1 generated by the electric motor 2 while the vehicle is running.

13 is a rotation sensor that detects the rotation speed of the axle 1; for example, an optical encoder is used to detect the rotation a of the axle 1;
φ It detects the rotation direction, rotation angle, etc. and sends out a signal.

Note that 14 is a bearing, which is provided between the motor cover 23 to which the stator 22 is attached and the axle 1.

Next, in FIG. 2, the same parts as in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted. Reference numeral 4 denotes a turbocharger, which is connected to the exhaust pipe 5a of the engine 5, and uses exhaust gas energy to drive a turbine blade 4a, which also drives a compressor blade 4b provided coaxially with the turbine blade 4'a, to charge intake air. is compressed and the supercharged air is force-fed to the engine 5 via the intake pipe 5b.

Note that the turbine blade 4a and the compressor blade 4
A rotor of an electric motor 4C is provided on the rotating shaft directly connected to the motor 4C, and a stator winding corresponding to the rotor is connected to a controller 7, which will be described later, to transmit and receive electric power.

An exhaust turbine 6 is connected to an exhaust port 4d on the turbine blade 4a side of the turbocharger 4, and the blade 6a is driven by the energy of the exhaust gas after driving the turbine blade 4a. The rotor of an alternating current generator 6b is directly connected to the rotating shaft of the blade 6a, and the output from the alternating current generator 4'lsb is connected to the controller 7.

The controller 7 has a microcomputer, and is further equipped with a converter, an inverter, a rectifier, etc. for heavy electric power.
As input signals, in addition to the signal from the rotation sensor 13 provided on the axle 1, although not shown, the rotation signal of the engine 5, the boost signal of the intake pipe 5b, the exhaust pipe 5a and the exhaust port 4d
Various predetermined signals are input, such as an exhaust pressure signal based on the exhaust pressure of. Then, an electric motor 4 provided in the turbocharger 4
When C is supplied with electric power during the operation of the generator or electric power from the alternator 6b provided in the exhaust turbine 6, the rotation sensor 1
In response to the detection signal from 3, frequency conversion of the supplied power is performed, and ? It is configured to transmit power to the Itlh machine 2 to drive the electric motor 2 and drive the axle l, thereby assisting the running force of the wheels 15.

In addition, the battery 8 supplies power to the controller 7, and when the engine 5 is at low rotation speed and under heavy load, it supplies power as a power source to the electric fi 4c, which operates as an electric motor and supercharges the compressor blade 4b. The output of the engine 5 is increased. Further, when braking the vehicle, the electric motor 2 is operated as a generator to convert braking energy into electrical energy, and the battery 8 is charged via the controller 7 as direct current of a predetermined voltage.

Next, the operation of this embodiment configured as described above will be explained.

In FIG. 2, the engine 5 is operated and the high temperature exhaust gas discharged from the exhaust pipe 5a is transferred to the turbocharger 4.
is guided to drive the turbine blades 4a. and,
Compressor 4b provided coaxially with turbine blade 4a
is driven to forcefully feed supercharged air to the engine 5 via the intake pipe 5b, and at the same time, the electric motor 4C is driven as a generator, and its output is transmitted to the controller 7.

On the other hand, the exhaust gas having residual energy that drives the turbine blades 4a and is discharged from the exhaust port 4d rotates the blades 6a of the exhaust turbine 6 and drives the AC generator 6b.
to drive. Then, the above residual energy is converted into electrical energy and becomes the output from AC power generation @sb,
Power is transmitted to the controller 7.

Here, a detection signal from a rotation sensor 13 provided on the axle 1 is input as an input signal to the controller 7,
In response to this detection signal, the electric power transmitted from the electric motor 4C and the AC generator 6b is frequency-converted into an alternating current of a predetermined frequency that causes the electric motor 2 provided on the axle 1 to move as the electric motor operates, and is then supplied to the electric motor 2. do. Therefore, engine 5
The running force of the wheels 15 driven by the power source is enhanced by the driving force generated by the electric motor 2 described above.

FIG. 3 is an explanatory diagram of a rotor used in an electric motor 2 according to another embodiment of the present invention, in which a plurality of sets of permanent magnets 26 having strong magnetic force are attached to the outer periphery of the axle 1, and a multipolar rotor (permanent A magnet type rotor) 27 is formed. Then, a stator 22' having a stator winding 25' corresponding to the multipolar rotor 27 is attached to the inside of the motor cover 23,
It constitutes an AC generator.

In the embodiment using the electric motor 2' having the multi-pole rotor 27, when the engine 5 is operated, the exhaust energy of the engine 5 operates the electric motor 4c and the alternator 6b, and AC power is supplied to the controller 7. The controller 7 receives the detection signal from the rotation sensor 13 as an input signal, and controls the frequency and phase of the supplied AC power in response to the detection signal, thereby controlling the motor 2'.
The AC power is converted into alternating current power and transmitted to the electric Ja2', thereby assisting the running power of the wheels 15.

In addition, when braking the vehicle, in the case of the electric A2 using the cage-shaped rotor 21, induction power generation is used. In the case of the electric motor 2' using the multi-polar rotor 27, it is operated as an AC generator, and the transmitted AC power is rectified by the controller 7 and then supplied to the battery 8 for charging.

Further, the electric motor cover 23 containing the electric motor 2 (2') is attached to the chassis 3 by a holding mechanism 24 having an anti-slip guide 24a and a spring 24b, so that the weight of the electric motor, axle 1, etc. is retained, and The holding mechanism 24 absorbs vibrations during traveling and vibrations caused by the operation of the electric motor.

Although the present invention has been described with reference to the above embodiments, various modifications can be made within the scope of the gist of the present invention. For example, a DC motor may be used as the electric motor, and a system for recovering exhaust energy may be used. Other motor drive systems may also be used and are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention, the rotor of the electric motor is provided on the axle that drives the wheels, and electric power is supplied to the windings of the stator of the electric motor to generate the running force of the wheels. Because of this, there is no transmission loss due to gear mechanisms, etc., and the torque of the motor rotor is directly transmitted to the wheels, resulting in good transmission efficiency.

Furthermore, according to the present invention, the electric motor provided on the axle is attached to the vehicle body by a holding mechanism that can absorb vibrations, so vibrations during driving or when the electric motor is in operation are absorbed by the holding mechanism and are difficult to transmit to the vehicle body. Effects can also be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a wheel drive device according to the present invention, FIG. 2 is a block diagram showing the configuration of this embodiment and related parts, and FIG. 3 is a diagram of an electric motor according to another embodiment. It is an explanatory view of a rotor. DESCRIPTION OF SYMBOLS 1... Axle, 2 (2')... Electric motor, 4... Turbocharger, 6... Exhaust turbine, 13... Rotation sensor, 21... Cage type rotor, 22 (22')・・・
・Stator, 24... Holding mechanism, 26... Permanent magnet, 27... Multipolar rotor (permanent magnet type rotor), 4c.
...Electric motor, 6b...AC generator.

Claims (5)

[Claims] (1) A wheel drive device characterized in that a rotor of an electric motor is provided on an axle that drives the wheels, the stator side is attached to the vehicle body by a holding mechanism, and electric power is supplied to the electric motor to drive the wheels. (2) Claim No. 1, characterized in that the electric motor is attached to the vehicle body by a holding mechanism having vibration absorption power.
) The wheel drive device described in item 2. (3) The electric motor is an alternating current machine, and the rotor of the alternating current machine is a cage-type rotor.
) The wheel drive device described in item 2. (4) The wheel drive device according to claim (1), wherein the electric motor is an alternating current machine and the rotor of the alternating current machine is a permanent magnet type rotor. (5) The wheel drive device according to claim (1) or (2), wherein the electric motor is a DC motor.