JPS59159435A - Magnetic particle type solenoid clutch - Google Patents

Abstract

PURPOSE:To make the miniaturization of a solenoid clutch attainable and its transfer torque ever so larger, by applying an amorphous alloy to a magnetic particle for coupling use. CONSTITUTION:When a solenoid coil 6 is energized with current, the magnetic flux that goes across a clearance having interposed a coupling magnetic particle 9 composed of an amorphous alloy in between and passes through a yoke 4 and a driven member 8 is generated there, and with this magnetic flux, the magnetic particle 9 is magnetized and solidified by dint of mutual binding power and that the driven member 8 being in a standstill is also solidified, receiving the frictional force produced between the yoke 4 and the magnetic particle 9 being solidly rotated together with the yoke 4, thereby starting rotation, and shortly tha member 8 comes to the same speed as the yoke 4, thus turning torque in a crankshaft 1 is transmitted to an input shaft 2. At this time, since the magnetic particle 9 is one using the amorphous alloy excellent in magnetic permeability, magnetic flux density grows large whereby the said magnetic binding power and frictional force increase, thus large turning torque is transmittable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic particle type electromagnetic clutch in which coupling magnetic particles are interposed between opposing surfaces of a driving shaft and a driven shaft.

This divine electromagnetic clutch applies a magnetic field to the connecting magnetic particles to create a magnetic coupling force between the magnetic particles, thereby transmitting torque from the driving shaft to the driven shaft. The connecting magnetic powder used for this purpose is preferably one with high magnetic permeability that can generate a larger coupling force for the same magnetic field and transmit a larger i-lux. In addition, it is preferable that the magnet be resistant to abrasion caused by loosening between the opposing surface and the opposing surface due to the presence of magnetic particles during non-excitation or transitional periods of connection.

As a result of repeated experiments to obtain magnetic powder with such characteristics, the Brahminists discovered that Alfushisu alloy has extremely excellent performance.

Therefore, it is an object of the present invention to provide a magnetic powder type electromagnetic clutch which is small in size and yet has a large torque transmission force by using the above-mentioned Amorphous J.S base metal as a connecting magnetic powder.

The present invention will be explained below with reference to illustrated embodiments.

FIG. 1 shows a magnetic particle type electromagnetic clutch. In the figure, 1 is a crankshaft which is a driving shaft, and 2 is an engine shaft I7 of a transmission which is a driven shaft.

A disk-shaped ring gear 33 is coupled to one end of the crankshaft 1, and an annular yoke 4 made of a magnetic material is attached to the circumferential surface of the ring gear 3 ('J). A driven holder 5 having a cylindrical portion at the center faces and covers the ring gear A73, sandwiching the ring gear A73.The ring gear 3, yaw 4, and driven holder 5 rotate together with the crankshaft 1.Also, An electromagnetic coil 6 is disposed within the annular wall of the yoke 4.

One end of the input shaft 2 is spline-fitted to a hub 7 rotatably held in the cylindrical portion of the driven boulder 5 via a bearing. A driven member 8 made of a magnetic material is fitted onto the outer circumference of the hub 7, and the outer circumferential surface of the driven member 8 faces the inner circumferential surface of the yoke 4 with a predetermined gap formed therebetween. Connecting magnetic particles 9 are arranged in this opposing gap.

On the opposing surfaces of the ring gear λ73 and the driven holster 5, there is a circular noront cover 10 and a labyrinth A7, respectively.
1 are provided, and their outer peripheries are formed in a V-shaped cross section to cover the driven member 8 and prevent the magnetic particles 9 from dissipating.

A slip ring 12 is provided on the outer periphery of the cylindrical portion of the driven holster 5 and is in contact with the electric coil 6.
(The brush 14 held by the brush holder 13 is brought into sliding contact with the ring 12, and the electromagnetic coil 0 is connected to the ring 12 from the outside.)
It is so that the current is applied to J-.

The operation of the electromagnetic clutch based on the above structure will be explained below.

When the electromagnetic coil 6 is energized, magnetic particles 9 are generated as shown by the chain line in the figure.
4J5 and the driven member 8 is generated across the interposed gap. As a result, the magnetic particles 9 are magnetized and solidified by mutual magnetic coupling force. The stationary driven member 8 solidifies and begins to rotate due to the frictional force generated between the yoke 4 and the integrally rotating magnetic powder 9, and eventually - (at the same speed as the yoke 4, the crankshaft 1 Nof 1 ~ 1 rotation 1 - Luk is input I ~ shaft 1 ~
2.

When the energization to the electromagnetic coil 6 is stopped 1), the binding force of the magnetic particles 9 is canceled, and the transmission of j to the driven member 8 from the yoke 4 to the driven member 8 is no longer performed.

Here, the magnetic coupling force of the magnetic particles 9 and the II friction force generated between the magnetic particles 9 and the driven member 8 are proportional to the density of the magnetic flux that crosses the magnetic particles 9. And the same electromagnetic
When this is used, the culm magnetic flux density of the magnetic powder 9 having high magnetic permeability is high, and therefore the above-mentioned magnetic coupling force and frictional force increase, making it possible to transmit a human-like rotational torque.

By the way, the inventors have noticed that amorphous alloys generally have high magnetic permeability, and that if they are used as the magnetic powder material of the electromagnetic clutch, great effects can be obtained.

Therefore, regarding the magnetic powder made of Fe-AI-Cr alloy or stainless steel alloy and the magnetic powder made of amorphous alloy, which are commonly used as magnetic powder materials of this kind, when these are used as the coupling magnetic powder 9 of the electromagnetic clutch, The maximum transmission torque of the electromagnetic clutch was investigated. This is shown in FIG. In this figure, line a is Fe-AI-Cr
Alloy, wire is stainless alloy, wire C1 wire d1 wire e each <1-eye B7. rS! 2), (Fe
g/Btsr S la, r Cx, ), <+-c
It is an amorphous alloy with a composition of 7 COtg B10 Si7). According to FIG. 2, the transmission torque of the electromagnetic clutch using amorphous alloy magnetic powder is superior over the entire variable range of the excitation current of the electromagnetic coil 6. Note that amorphous alloys are not limited to those mentioned above, but include (Fe, Go)-B-8i system, (Fe, C
o, Ni) -B-8i system, Fe-B-8i system, F
High permeability amorphous alloys such as e -5-s; -c series can be used; in the inventors' experiments, (F Oy, -Btr
S') to ), (Fe7Y z BI7S
iλ), (F e7? B10
8! 5), (Fet
, o Ni ugvo, s, 8), etc., the same effect as in the second embodiment was obtained. In addition, it was confirmed that the amorphous alloy magnetic powder has sufficient wear resistance even when the magnetic powder is worn out due to friction in the driven member 8 during the transition period of engagement of the electromagnetic clutch.

Furthermore, amorphous alloys can have extremely low residual magnetism, so they cut easily.

As described above, the magnetic particle type electromagnetic clutch of the present invention dramatically increases the torque transmission force by using an amorphous alloy for the coupling magnetic particles, thereby realizing a small, lightweight, and high-performance electromagnetic clutch. It is something.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view of a magnetic particle type electromagnetic clutch, and FIG. 2 is a diagram comparing the maximum transmission torque of the clutch. 1... Crankshaft (drive shaft) 2...
・・Inbutsu] Heshafu 1 to (driven shaft) 4...
・Yoke 6... Electromagnetic coil 8... Driven member 9... Connecting magnetic powder Figure 1

Claims (1)

[Claims] A magnetic powder type that transmits torque from the drive shaft to the driven shaft by applying a magnetic field to the coupling magnetic powder interposed between the opposing surfaces of the drive shaft and the driven shaft to solidify the magnetic powder.
43. A magnetic powder type electromagnetic clutch characterized in that the magnetic latch is made of an amorphous alloy for the connecting magnetic powder.