JPS61103018A - Magnetic-particle solenoid clutch - Google Patents

Abstract

PURPOSE:To reduce the axial length of a labyrinth and to shorten the whole axial length by providing power gaps on the inner and outer peripheral surfaces of a driven member incorporating an exciting coil. CONSTITUTION:A driven member 10 has an exciting coil 14 in the interior thereof, and the periphery of the exciting coil 4 is a magnetic field forming part 16. The first and second driving members 20, 30 are disposed at the powder gaps 56, 58 on the inner and outer peripheral sides of the driven member 10. In order to prevent magnetic powder disposed in the first and second powder gaps 46, 48 from leaking out from the powder gaps, there are provided labyrinths 80, 82, 84, 86 corresponding to the power gasp 56, 58. The labyrinths may be only one row on one side to reduce the axial length.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic particle type electromagnetic clutch used in a power transmission path of a vehicle such as an automobile. More specifically, the present invention relates to a magnetic powder type electromagnetic clutch having a so-called condensing liquid type configuration.

[Conventional technology]

BACKGROUND ART Magnetic powder electromagnetic clutches (powder clutches) have been known as clutches used in vehicles such as automobiles.

Powder type electromagnetic clutches are categorized by powder gap into small gap type and condensing type. The small-gap type has a single powder gap structure, and the condensing type has a double powder gap structure.

The small-gap type has a single powder gap, so it has a simple structure and good performance stability.
The comparative torque transmission capacity is small compared to the condensing liquid type, and therefore, if you try to obtain the same torque transmission capacity as the condensing liquid type, there is a disadvantage that it will be larger.

For this reason, when there is a space restriction, a condensing liquid magnetic powder type electromagnetic clutch is used, which is relatively small and can obtain a large torque.

Liquid-returning magnetic powder type electromagnetic clutches are classified into non-separable liquid-returning type and separation-restoring type, depending on the presence or absence of a double structure, that is, the presence or absence of a connection between two powder gaps. In the non-separated condensation type, the magnetic particles in the two powder gaps can move relative to each other, and in the separation and return type, the two powder gaps are completely independent, and the magnetic particles do not move between each other. It is.

However, the non-separated condensate type has a problem in that the transmission torque performance is unstable because the magnetic particles are mutually movable.

For this reason, when it is necessary to obtain stable transmission torque in a compact size, a separation/restoration type magnetic particle type electromagnetic clutch is used. Since the two powder gaps are independent of each other, the magnetic particles do not move, and stable torque transmission performance can be obtained as with the small gap type.7, □ .

[Problem that the invention seeks to solve]

However, the conventional separation and restoration type has a problem in that the axial dimension is longer than that of the non-separation and recovery type. This is because the conventional separation-and-restoration type is usually arranged with two powder gaps overlapping each other.
In order to make the two powder gaps independent,
It is necessary to provide labyrinths on both sides of each powder gap to prevent leakage of magnetic particles, and the labyrinths are provided in double parallel on both sides. On the other hand, the non-separated condensing liquid type usually has a labyrinth installed in parallel only on one side, so the separated and restoring type has a longer length on one side than the non-separated ri-gap type. It depends.

Therefore, the problem to be solved by the present invention is to reduce the increase in the axial length due to the labyrinth as much as possible even in a magnetic particle type electromagnetic clutch that has a so-called non-separated condensing liquid structure. The aim is to shorten the axial length.

[Means for solving problems]

The present invention aims to solve the above-mentioned problems by providing a powder gap on the inner and outer circumferential surfaces of a driven member containing an excitation coil.

Specifically, the magnetic particle type electromagnetic clutch according to the present invention takes the following measures.

That is, in the magnetic particle type electromagnetic clutch of the present invention, the cylindrical driven member has an excitation coil built therein, and a magnetic field forming portion around the excitation coil is formed of a magnetic material. A first driving member and a second driving member are disposed at the inner and outer peripheral positions of the cylindrical driven member with a predetermined gap therebetween.

At least the portions of the first driving member and the second driving member that face the driven member are formed of a magnetic material. Further, the first driving member and the second driving member are integrally connected via a connecting member made of a non-magnetic material. Furthermore, a first powder gap and a second powder gap are formed by gaps provided between the driven member and the first and second driving members.
Magnetic powder is arranged in the powder gap, and the first powder gap and the second powder gap are separated by a labyrinth.

[Effect]

According to the above-mentioned means, since the first and second powder gaps are provided at the inner and outer peripheral positions of the driven member containing the excitation coil, leakage of magnetic particles from these two powder gears 7 is prevented. It is not necessary to install two labyrinths in parallel on one side as in the conventional separation type condensing type.
Since only the rows are required, the axial length due to the provision of the labyrinth can be reduced compared to the conventional method.

The connecting action of a magnetic particle type electromagnetic clutch is performed by energizing the excitation coil by energizing the excitation coil, and the disengaging action is performed by stopping the energization of the excitation coil and deenergizing the excitation coil. .

That is, magnetic flux is generated by exciting the excitation coil, and this magnetic flux passes through the first and second powder gaps on the inner and outer peripheries of the driven member, and the magnetic particles in the powder gap are combined by this magnetic flux 1, and the driving side member A first driving member and a second driving member are
Power is transmitted from the driving member to the driven member, which is the driven member. Conversely, when the excitation coil is deenergized, the magnetic flux disappears, the bond between the magnetic particles in the powder gap is broken, and power is no longer transmitted from the driving side member to the driven side member.

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

FIG. 1 shows a first embodiment of a magnetic particle type electromagnetic clutch according to the present invention.

In FIG. 1, 10 indicates a driven member, 20 a first driving member, and 30 a second driving member. The driven member 10 has an excitation coil 14 therein, and the area around the excitation coil 14 is a magnetic field forming region 16 . The magnetic field generating portion 16 is made of a magnetic material. This driven member 10 is connected to an output shaft 40 which is an output member.
0 through a flange 42 formed integrally with the flange 42. The flange 42 is provided in the left position as viewed in FIG. 1, and the radial direction of the flange 42 is;
The support part 44 at the outer position has an 8th pre-71'46
is provided. The slip ring 46 is for supplying power to the excitation coil 14 through a wiring 48.

The first driving member 20 is disposed on the outer periphery of the driven member 10 with a predetermined gap therebetween. This first driving member 2
0 is a support portion 22, a portion 24 of the surface facing the driven member,
and a cover member 26. The surface portion 24 facing the driven member is disposed opposite to the driven member 14 with a predetermined gap therebetween, and is supported by the support portion 22 . The surface portion 24 facing the driven member is formed of a magnetic material such as iron, and the support portion 22 is formed of a non-magnetic material such as aluminum by die-casting. The cover member 26 is arranged on the left side of the support part 22 as seen in FIG. 1, and is attached to the support part 22 by bolts 28, making it integral.

The second driving member 30 is disposed at an inner peripheral position of the driven member 10 with a predetermined gap therebetween. This second driving member 3
0 consists of a support portion 32 and a surface portion 34 facing the driven member. A surface portion 34 facing the driven member is disposed opposite to the driven member 14 with a predetermined gap therebetween, and is supported by the support portion 32 . The surface portion 34 facing the driven member and the support portion 32 are made of the same material as the surface portion 24 facing the driven member and the support portion 22 of the first driving member 20 described above. That is, the surface portion 34 facing the driven member is formed of a magnetic material, and the support portion 32 is formed of a non-magnetic material.

The first drive member '20 and the second drive member 30 are
As seen in the figure, they are integrally connected via a connecting member 70 disposed on the right side. The connecting member 70 is made of a non-magnetic material. The connecting member 70 and the first driving member 20 are connected by a bolt 72, and the connecting member 70 and the second driving member 30 are connected by a bolt 74, so that they are integrally connected. In this way, the first driving member 20 and the second driving member 20
It is integrally connected with the drive member 30 and constitutes a drive side member. This drive side member includes an input shaft 50 that is an input member, and a flange 52 that is integrally provided on the input shaft 50.
are connected via. Further, this drive side member is positioned on the output shaft 40 and rotatably supported by bearings 60, 62 arranged on the left and right sides as seen in FIG. The left bearing 60 is the first drive member 2
A cover member 26 of No. 0 is rotatably supported on a support portion 44 of an output shaft 40. The right bearing 62 rotatably supports the support portion 32 and the connection portion 70 of the second drive member 30 on the output shaft 40 .

The first driving member 2 on the inner and outer peripheral surfaces of the driven member 10
A predetermined gap between the surface portion 24 of the second driving member 30 facing the driven member and the surface portion 34 of the second driving member 30 facing the driven member is a first powder gap 56 and a second powder gap 58. Although not shown in the figure, there is magnetic powder (powder) in the first and second powder gaps 56 and 58.
are arranged. That is, in this embodiment, the first and second powder gaps 56 and 58 are
It has a condensing type structure provided on the inner and outer peripheries of the tank.

In order to prevent the magnetic particles arranged in the first and second powder gaps 46, 48 from leaking from the powder gaps,
A labyrinth 80.82.84.86 is provided.

A labyrinth 80.82 is provided for the first powder gap 56 and a labyrinth 84.86 is provided for the second powder gap 58. A labyrinth 80 for the first powder gap 56 is provided between the left side surface of the driven member 10 and the cover member 26 of the first driving member 20, and a labyrinth 80 for the first powder gap 56 is provided between the left side surface of the driven member 10 and the cover member 26 of the first driving member 20. Prevents leakage. The labyrinth 82 is provided between the right side surface of the driven member 10 and the connecting member 70,
This prevents leakage from the right side of the first powder gap 56. Labyrinth 8 to second powder gap 58
4 is provided between the left side surface of the second drive member 30 and the flange 42 of the output shaft 40 to prevent leakage from the left side of the second powder gap 58. labyrinth 8
6 is provided between the right side surface of the second driving member 30 and the attachment portion 18 that is integrally provided on the driven member 10, and prevents the second powder gap 158 from leaking from the right side. ing. In addition, each of these labyrinths 80.82.84
．． 86 is made of a non-magnetic material, and the detailed structure adopts a well-known general structure as shown in the drawing.

Labyrinth 80.8 provided in the first powder gap 56
2 and a labyrinth 8 provided in the second powder gap 58
4.86 is because the first powder gap 56 and the second powder gap 58 are provided at the inner and outer periphery positions of the driven member 10 containing the excitation coil 14, so that they are arranged in parallel on one side as in the conventional case. There is no need to provide one, and the labyrinth can be configured with only one line in series, and the axial width of the labyrinth can be made shorter than in the past.

Next, the operation of the magnetic particle type electromagnetic clutch having the above-described configuration will be explained.

First, the connecting action of the magnetic particle type electromagnetic clutch is performed by energizing and energizing the excitation coil 14 through the slip ring 46 and the wiring 48.

When the excitation coil 14 is energized, a magnetic flux as shown by the broken line in FIG. 1 is generated. That is, it circulates between the magnetic field forming part 16 of the driven member 10, the part 24 of the first driving member 20 facing the driven member, and the part 34 of the second driving member 30 facing the driven member. Magnetic flux is generated. In addition,
The direction of this magnetic flux is reversed by reversing the winding of the excitation coil 14 or by reversing the direction of the excitation current.

Due to the above-mentioned generation of magnetic flux, the magnetic particles arranged in the first powder gap 56 and the second powder gap 58 are linked together in a chain, and are driven by the frictional force and electromagnetic coupling force between the magnetic particles. The first driving member 20 and the second driving member 30, which are side members, and the driving member 10, which is a driven side member, are coupled, and power is transmitted from the input shaft 50 to the output shaft 40.

Next, the releasing action of the magnetic particle type electromagnetic clutch is performed by deenergizing the excitation coil 14.

By de-energizing the excitation coil 14, the magnetic flux disappears and the magnetic particles are uncoupled, so that no power is transmitted.

As described above, this embodiment is a so-called condensing type magnetic powder electromagnetic clutch having the first powder gap 56 and the second powder gap 58, so the transmission torque performance is lower than that of the conventional small gap type electromagnetic clutch. Compared to the second one with the same outer diameter,
It becomes 1.5 to 2.0 times.

Further, the first powder gap 56 and the second powder gap 58 are separated by labyrinths 80, 82, 84, 86, and have a so-called separation-condensation type configuration.
The magnetic particles are completely separated and do not move between the first and second powder gaps 56, 58, and the transmitted torque performance is stable as in the case of the small gap type. In other words, in this embodiment, a small gap internal coil type magnetic particle electromagnetic clutch is superimposed on the outer periphery of a small gap external coil type magnetic particle electromagnetic clutch that shares the excitation coil 14. Therefore, regarding the stability of power transmission performance, it is possible to obtain almost the same performance as that of the small gap type.

FIG. 2 shows a second embodiment of the magnetic particle type electromagnetic clutch according to the present invention.

In this second embodiment, by arranging the bearings 60 and 62 in the first embodiment described above directly below the second drive member, the axial length is increased by using only - number of bearings 64. This is a shortened version. The position of the bearing 64 is substantially below the center of gravity of the first driving member 20 and the second driving member 30, which are driving side members, and the driven member 10, which is a driven side member. Further, in this second embodiment, the driven member 10 is connected to the output shaft via a rubber damper mechanism 90.

The other basic structure of this second embodiment is the same as that of the first embodiment described above.
This is the same as in the embodiment, and the same or corresponding parts are denoted by the same reference numerals, and redundant explanation will be omitted.

〔Effect of the invention〕

As described in detail above, according to the present invention, the first and second powder gaps having the structure of the so-called separated condensate liquid are provided on the inner and outer peripheries of the driven member containing the excitation coil. The labyrinths for these two powder gaps do not need to be provided twice in parallel on one side as in the conventional separation/condensation system, but only the - row is sufficient, so the axial length of the labyrinth can be reduced. , the overall axial length can be shortened. That is,
It can be made as small in size as the axial length of non-separated condensate, and can be easily mounted on a vehicle.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a magnetic particle type electromagnetic clutch according to the present invention. FIG. 2 is a sectional view showing a second embodiment of the magnetic particle type electromagnetic clutch according to the present invention. Explanation of symbols 10--Driven member 14--One excitation coil 16--Magnetic field forming portion 20--First drive member 24--One surface facing the driven member Part 30-・-
Second driving member 34 - - - Opposing surface portion 56 - - to the driven member
First powder gap 58-111 - Second powder gap 70 - 111 connection member 80.82.84.86 - Labyrinth Applicant Toyota Motor Corporation Figure 2 Procedure Written amendment (voluntary) February 73, 1982

Claims (1)

[Claims] 1. The cylindrical driven member has a built-in excitation coil, and the magnetic field forming area around the excitation coil is made of magnetic material, and the inner and outer peripheries of the cylindrical driven member are The first driving member and the second driving member are placed at a predetermined gap.
A driving member is disposed, and at least a surface portion of the first driving member and the second driving member that faces the driven member is formed of a magnetic material, and the first driving member and the second driving member are made of a magnetic material. The second driving member is integrally connected via a connecting member made of a non-magnetic material, and the first driving member is formed by a gap provided between the driven member and the first driving member and the second driving member. A magnetic particle type electromagnetic clutch characterized in that magnetic particles are arranged in a powder gap and a second powder gap, and the first powder gap and the second powder gap are separated by a labyrinth.