JPS601432A - Torque converter - Google Patents

Abstract

PURPOSE:To simplify structure of a torque converter and make the same compact and lightweight, by employing a magnetic fluid as a torque transmitting liquid. CONSTITUTION:A casing 18 covering a disc 16 is fixed to a driven shaft 14, and a magnetic fluid 20 and a fluid 22 incompatible with the magnetic fluid 20 are accommodated in the casing 18. An electromagnet 24 is arranged at an outer peripheral portion 18A of the casing 18. When current is supplied to the electromagnet 24, a magnetic field across the casing 18 and the disc 16 is generated at the outer periphery of the casing 18, and the magnetic fluid 20 and the disc 16 are restricted by the magnetic field, a strength of which may be freely varied by controlling the current. Accordingly, it is possible to simplify structure of a torque converter and make the same compact and lightweight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a torque comparator □-j that transmits torque of a driving shaft to a driven shaft using fluid as a medium.

[Prior art]

The conventional torque converter, as shown in Fig. 1,
The driving shaft 2 and the driven shaft 4 are arranged in a straight line, and the driving shaft 2
A pump impeller 6 is fixed to the pump impeller 5, a turbine impeller s is fixed adjacent to the pump impeller 6, and a guide vane 10 is fixed to the driven shaft 4 adjacent to the turbine impeller 8.

When the main drive shaft 2 is rotated, the pump impeller 6 fixed to the main drive shaft 2 rotates, sucks in the working fluid, and uses centrifugal force to push the working fluid outward while imparting angular momentum to the outlet. Spit it out. The discharged working fluid returns from the turbine impeller 8 to the pump impeller 6 through the guide vanes 9.

At this time, the working fluid imparts angular momentum to the turbine impeller 8 fixed to the driven shaft 4, so that torque is transmitted to the driven shaft 4. Further, the torque of the working fluid is absorbed by the fixed guide vanes 9, and a torque difference is created between the main driving shaft 2 and the driven shaft 4.

The shapes of the pump impeller 6, the turbine impeller 8, and the guide vanes 9 must be suitable so that the transmission of angular momentum occurs without loss, and the casing 10 must be connected to the turbine impeller 8 to seal the working fluid. Conventional torque converters have a complicated structure, are high in cost, and have a large weight.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and its purpose is to provide a completely new torque converter that has never existed before by using a magnetic fluid as a torque transmission liquid.

[Structure of the invention]

According to the present invention, a disk is attached to a driving shaft, a casing covering the disk is fixed to a driven shaft disposed in line with the driving shaft, and a magnetic fluid is contained in the casing, and a magnetic fluid is mixed with the magnetic fluid. A torque converter is obtained which is characterized in that it contains an insoluble fluid and that an electromagnet is disposed around the outer periphery of the casing for generating a magnetic field across the casing and the disk, thereby achieving the above object.

[Example of invention ability]

Embodiments of the present invention will be described below based on the drawings.

2 and 3 are diagrams showing the torque converter 11 according to the present invention.

In FIG. 2, Dorkuco/Nokuta 11 according to the present invention
A main drive workpiece 2 having a disk 16 pivotally attached to the end thereof, a driven shaft 14 disposed in line with the main drive shaft 12, a casing 18 fixed to the driven shaft 14 and extending around the main drive shaft 12,
It is composed of a magnetic fluid 20 housed inside the casing 18 and another fluid 22 that is incompatible with the magnetic fluid 20, and an electromagnet 24 disposed on the outer edge 18A of the casing 18.

The electromagnets 24 are placed at the same location on the outer circumference of the casing 18, so that a magnetic field across the gauging 18 and the disk 16 is formed along the outer circumference of the casing.

The electromagnet 24 has a coil 24B wound around a U-shaped iron core 24A.

It is desirable that the two types of liquids contained in the casing 18 are incompatible with each other. When phase i'+'f, magnetic fluid 2
This is because 0 is diluted, the magnetizing force is weak, and the torque transmission force is also weak.

Since the magnetic fluid 20 and other fluid 22 in the casing 18 are not compatible with each other, they are separated into two phases due to the difference in specific gravity, as shown in FIG.

When the electromagnet 24 is energized, a magnetic field is generated between both ends of the iron core 24A, and a donut-shaped magnetic field is formed on the outer periphery of the casing 18 in a direction that crosses the casing 18. Therefore, the magnetic fluid 20 is attracted to the magnetic poles at both ends of the iron core 24A, and gathers inside the outer edge of the casing 18, as shown in FIG. At this time, the magnetic fluid 20 and the disk 16 are restrained by the magnetic field of the electromagnet 24, and as the main drive @] 12 rotates, the magnetic fluid 20 and the casing 18
, the driven shaft 14 can rotate together.

The strength of the magnetic field formed on the outer periphery of the casing is determined by the electromagnet 24.
Since it is proportional to the magnitude of the current supplied to the coil 24, the transmitted torque can be freely changed by adjusting the current supplied to the coil 24 and weakening the binding force of the electromagnet 24 to the magnetic fluid 20.

Further, even if the electromagnet 24 is energized while the main drive shaft 12 is rotating, the magnetic fluid 20 gathers around the outer circumference of the casing and torque is transmitted, as described above. At this time, if the specific gravity of the magnetic fluid 20 is made larger than the specific gravity of the other fluids 22, the liquid in the casing 18 will begin to rotate due to its viscosity as the driving shaft 120 rotates, and the magnetic fluid with a large centrifugal force will 20 moves outward within the casing 18, the predetermined torque can be immediately transmitted by energizing the electromagnet 24.

In the torque converter 11 according to this embodiment, a disk 16 is attached to a driving shaft 12, a casing 18 covering the disk 16 is fixed to a driven shaft 14 disposed in line with the driving shaft 12, and a magnetic fluid is contained in the casing 18. 20 and a fluid incompatible with the magnetic fluid, and the casing 1
Since the electromagnet 24 that generates a magnetic field that crosses the casing 18 and the disk 16 is disposed around the outer circumference of the disk 8, the overall structure can be simplified, and it is possible to reduce the weight and size.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a compact and lightweight torque converter can be obtained with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional torque converter, FIG. 2 is a sectional view of an embodiment of the torque converter according to the present invention, and FIG. 3 is a sectional view of the torque converter in a state during torque transmission. 11... Torque converter, 12... Main drive shaft, 14
... Driven shaft, 16 ... Disk, 18 ... Casing, 20 ... Magnetic fluid, 22 ... Another fluid,
24...Electromagnet. Agent Tatsuyuki Unuma (and 1 other person)

Claims (1)

[Claims] (1) A disk is attached to the main drive shaft, a casing covering the disk is fixed to the driven shaft arranged in line with the main drive shaft, and the casing contains a magnetic fluid and a fluid that is incompatible with the magnetic fluid. A torque converter is characterized in that an electromagnet is disposed around the outer periphery of the casing to generate a magnetic field that crosses the casing and the disk.