JPH028131Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil pump drive device that can be driven by an electric motor when the engine is stopped or when oil pressure is low.

For example, in a vehicle that uses a fluid actuator to change gears, an oil pump is used as a power source, and conventionally, the oil pump is driven by an engine or separately by a dedicated electric motor.

It is often necessary to change the gear when the engine is stopped, and in such cases, if the oil pump is driven by the engine, even if the oil pump is equipped with a pressure accumulator, the gear change cannot be performed due to the drop in oil pressure in the pressure accumulator. In addition, if the motor is driven by an electric motor, there is a possibility that the motor, switches, etc. may become inoperable due to disconnection or shorting, making it difficult to ensure reliability and making it difficult to handle backups in the event of a failure. There were some difficulties.

Therefore, as a means to solve these problems,
It has been proposed that the oil pump is also driven by an electric motor as a backup when the engine is stopped, and an electromagnetic clutch is interposed between the oil pump and the drive source.

However, electromagnetic clutches have many components and have a complicated structure, and therefore are not necessarily reliable, have high costs, and require external control.

The present invention aims to improve these conventional drawbacks, and its purpose is to interpose a one-way clutch in each drive transmission section from the engine and electric motor to the oil pump, so that when the engine is stopped or when the hydraulic pressure is It is an object of the present invention to provide a drive device for a vehicle oil pump that can stably supply hydraulic oil at low cost and with high reliability, since the oil pump is rotationally driven by an electric motor when the oil pressure decreases.

Next, one embodiment of the present invention will be described in detail using the drawings.

FIG. 1 shows the configuration of the present invention, in which 1 is a one-way clutch provided between an engine drive pulley 4 and an oil pump 3 driven by the engine via a V-belt, and 2 is an electric motor. 5
This is a one-way clutch installed between the oil pump 3 and the oil pump 3. FIG. 2 is a cross-sectional view of the one-way clutch 1 taken along the line A-A in FIG. A roller receiver is formed so that the outer race 10 and the pulley drive shaft 6 lock the roller 9 during rotation (in the direction of the solid line in the figure), and release the roller 9 during rotation in the other direction (in the direction of the chain line in the figure). It has a groove 8. Figure 3 shows one-way clutch 2
2 is a sectional view taken along line BB in FIG. 1, and a motor drive shaft is connected to the inner periphery of the outer race 20 connected to the other end of the rotor drive shaft 31 of the oil pump 3, similar to the one-way clutch 1 in FIG. A roller receiving groove 8 for locking or releasing the roller 9 with the roller 7 is formed.

Next, the operation of the present invention will be explained.

Normally, when the engine is rotating normally, the pulley drive shaft 6 of the engine drive pulley 4 is rotated in the direction of the solid line in FIG.
is locked in the roller receiving groove 8, and the pulley drive shaft 6
The rotation of is transmitted to the outer race 10 of the one-way clutch 1, so the oil pump 3 is driven.
Pressure oil can be sent to the required locations. At this time, the outer race 10 of the one-way clutch 2 is driven by the rotor drive shaft 31 of the oil pump 3, but since the direction of rotation is in the direction of the solid arrow in FIG.
Not locked inside. Therefore, the electric motor 7 is not affected at all. If you want to operate the oil pump 3 when the engine is stopped or the oil pressure is low,
The electric motor 5 is rotated by battery power to drive the oil pump 3. At this time, the motor drive shaft 7
The rotation is in the direction of the solid arrow in Figure 3, so
The roller 9 is locked in the roller receiving groove 8, and the rotation of the motor drive shaft 7 is transmitted to the rotor drive shaft 31 of the oil pump 3 via the outer race 20. On the other hand, the one-way clutch 1 has an outer race 10 driven by a rotor drive shaft 31 in this case.
rotates in the solid line direction in FIG. 2, so the roller 9 is not locked in the roller receiving groove 8. Therefore,
The engine drive pulley 4 is not affected in any way. In this case, the electric motor 5 may be started by providing a dedicated switch or by detecting engine stoppage and operating a change lever. Pressure oil is supplied from a disposed accumulator, and when the pressure in the accumulator decreases due to the supply, a motor drive means comprising a pressure switch detects the pressure.
It is also possible to constitute a mini power unit that rotates an electric motor by operating this pressure switch and then drives an oil pump, and can be added to a hydraulic pump system driven only by the engine.

As explained in detail above, the present invention connects an engine drive pulley to one end and an engine drive pulley to the other end of the rotor drive shaft of an oil pump that supplies pressure oil to the power steering and transmission through one-way clutches. The system is configured so that the electric motors are connected to drive each other, so unlike conventional devices that have a single drive device for the oil pump, the electric motors provide sufficient backup even when the engine is stopped or the oil pressure drops. In addition to providing high system reliability, it is also possible to share an oil pump for power steering, for example. Furthermore, since the current in the power section is consumed only in emergencies, its consumption is greatly reduced, so there is no need to increase the capacity of generators, batteries, etc. Moreover, unlike electromagnetic clutches, one-way clutches connected to both ends of the oil pump's rotor drive shaft are complex, expensive, have reliability issues, and require external control. The structure is simple, reducing costs, and
It is highly reliable, requires almost no maintenance, and eliminates the need for external clutch connection/disconnection control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are sectional views taken along lines AA and BB, respectively, of the one-way clutch shown in FIG. 1, 2...One-way clutch, 3...Oil pump, 4...Engine drive pulley, 5...Electric motor, 6...Pulley drive shaft, 7...Motor drive shaft, 8...Roller receiving groove, 9... …roller.

Claims (1)

[Scope of utility model registration request] In an oil pump drive device that pumps hydraulic oil that serves as a drive source for at least one of an automatic transmission and power steering, the oil pump is connected to one end of the rotor drive shaft, and the rotational force from the engine is transferred to the rotor drive shaft. A first one-way clutch is connected to the other end of the rotor drive shaft to transmit the rotational force from the electric motor to the rotor drive shaft, and the pressure of the hydraulic oil is lower than a predetermined value. 1. A drive device for an oil pump, comprising a motor drive means for rotationally driving the electric motor in the case of the above.