JPH0747623Y2 - Electromagnetic clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic clutch, and in particular, an armature is supported on a driven shaft through an elastic support member such as a leaf spring, and the force in the rotation direction and the attraction direction is applied. The present invention relates to an electromagnetic clutch of the type received by the elastic support member.

(Prior Art) Conventionally, a clutch rotor that is rotatable about an axis and is rotationally driven by an external drive source is disposed so as to face an axial end surface of the clutch rotor, and is movable in a direction parallel to the axis. Armature, an elastic support member that elastically supports the armature on a driven shaft, an electromagnet that includes the clutch rotor and the armature in a magnetic circuit, and that attracts the armature to an axial end surface of the clutch rotor, and the armature. An electromagnetic clutch including a stopper plate that restricts the movement of the clutch rotor in a direction away from the clutch rotor is known. In this type of electromagnetic clutch, the armature is attracted to the clutch rotor by the electromagnetic force generated by energizing the electromagnet, and the frictional force between them causes torque to be transmitted to the driven shaft through the elastic support. . When the electromagnet is de-energized, the armature is separated from the clutch rotor by the restoring force of the elastic support that supports it, and the transmission of rotation is stopped.

(Problems to be solved by the invention) The armature is attracted to the clutch rotor and the rotation is transmitted by the frictional force therebetween. Conventionally, a friction material is fixed to either surface in order to increase the friction between the two. The friction material has a ring shape and is usually fixed to the peripheral portion of the armature or the clutch rotor. This fixing method includes a method of using an adhesive and a method of directly fixing by molding. In the former method, an adhesive is applied to the peripheral portion of the armature or the clutch rotor, and a friction material is placed on the adhesive to heat and press the adhesive. However, this method has a drawback in that when an adhesive having a low viscosity is used, the adhesive flows out through a rivet hole provided in the armature or a slit for a magnetic circuit provided in the clutch rotor when the adhesive is applied. Further, when an adhesive having a high viscosity is used, it is difficult to control the injection amount of the adhesive and it is difficult to automate the application apparatus. Furthermore, a step of heating and pressurizing is required to firmly bond the friction material in a short time, resulting in poor productivity and high cost.

On the other hand, in the latter method, the processing conditions are high temperature and high pressure, and there is a problem that the surface treatment layer applied to the armature or the clutch rotor for the purpose of rust prevention or appearance aesthetics is damaged or composition deteriorates. Further, there is a drawback that requires expensive equipment.

Therefore, an object of the present invention is to provide an electromagnetic clutch having a structure capable of securely fixing a friction material to an armature at low cost.

(Means for Solving the Problems) According to the invention as set forth in claim 1, a clutch rotor rotatable about one axis and rotationally driven by an external drive source, and an axial end surface of the clutch rotor are arranged so as to face each other. An armature movable in a direction parallel to the one axis, and an elastic support member elastically supporting the armature on a driven shaft,
An electromagnet that includes the clutch rotor and the armature in a magnetic circuit and selectively contacts and separates the armature with the clutch rotor, and a friction material fixed so that one surface thereof is flush with the clutch rotor side end surface of the armature. In an electromagnetic clutch including and, the friction material is
A plurality of friction members, the friction members are dividedly arranged in the armature, and the friction members are pressed against the armature by a fixing member,
An electromagnetic clutch is obtained in which the fixing member is fixed to the armature by a rivet that fixes the elastic support body to the armature.

According to a second aspect of the present invention, a clutch rotor that is rotatable about one axis and is rotationally driven by an external drive source, and a direction that is arranged opposite to an axial end surface of the clutch rotor and is parallel to the one axis. An armature that is movable to the side, and an elastic support that elastically supports the armature on a driven shaft,
An electromagnet that includes the clutch rotor and the armature in a magnetic circuit and selectively contacts and separates the armature with the clutch rotor, and a friction material fixed so that one surface thereof is flush with the clutch rotor side end surface of the armature. In an electromagnetic clutch including and, the friction material is
An electromagnetic clutch is obtained in which the armature is pressed against the armature by a fixing member, and the fixing member is integrated with the friction member together with the friction member by a rivet that fixes the elastic support member to the armature. To be

(Operation) In the case of the invention according to claim 1, the friction material is composed of a plurality of friction members dividedly arranged on the armature. These friction members are pressed against the armature by the fixing member. Then, this fixing member is fixed to the armature by a rivet that fixes the elastic support body to the armature. Therefore, in the case of the invention according to claim 1, unlike the conventional case, an adhesive for fixing the friction material to the armature or a facility for molding the friction material on the armature is not required, and the friction member can be easily formed. It can be attached to an armature.

According to the second aspect of the present invention, the friction material is pressed against the armature by the fixing member. Then, this fixing member is integrated with the armature together with the friction material by a rivet that fixes the elastic support body to the armature. Therefore, also in the case of the invention as claimed in claim 2, unlike the prior art, an adhesive agent for fixing the friction material to the armature or a facility for molding the friction material on the armature is not required, and the friction material is simple. It is possible to attach to the armature.

(Embodiment) FIG. 1 is a sectional view of an electromagnetic clutch according to an embodiment of the invention described in claim 1, FIG. 2 is a rear view of the armature of the embodiment seen from the clutch rotor side, and FIG. It is a disassembled perspective view of the principal part of an example.

Referring to FIG. 1, the electromagnetic clutch of the present embodiment has a mounting portion.
11 includes a clutch rotor 13 made of iron, which is rotatably mounted about a shaft center via a bearing 12. The clutch rotor 13 has a belt receiving groove 14 on its outer peripheral surface for receiving a belt (not shown) that transmits power from an external drive source.

The friction surface 15 of the clutch rotor 13 has an iron armature.
The 16 friction surfaces 17 are opposed to each other. One end of a leaf spring 19 is fixed to the armature 16 with a rivet 18. The other end of the leaf spring 19 has a hub 21 fixed to one end of the driven shaft 20.
The rivet 22 is fixed together with the stopper. As a result, the armature 16 is attached to the hub 21 so that it can come into contact with and separate from the friction surface 15 of the clutch rotor 13.
The movement distance of the armature 16 in the direction away from the friction surface 15 is limited by the stopper 23.

An electromagnet 24 fixed to the mounting portion 11 is housed in the annular groove portion 13a of the clutch rotor 13, and the clutch rotor 13 and the armature 16 are included in the magnetic circuit (shown by the chain double-dashed line in the figure). . By thus attracting the armature 16 to the friction surface 15 of the clutch rotor 13 by electromagnetic force, the rotation of the clutch rotor 13 can be transmitted to the driven shaft 20.

When the electromagnetic force disappears, the armature 16 moves in the direction away from the friction surface 15 of the clutch rotor 13.

Referring to FIG. 2, the armature 16 has a ring shape. The ring-shaped armature 16 is formed with arcuate slits 25a, 25b, 25c ... Divided and arranged concentrically. These slits are provided to form a predetermined magnetic circuit, as shown at 25 in FIG.

Referring also to FIG. 3, in the case of the present embodiment, the friction material is composed of three friction members 26a, 26b, 26c. These friction members 26
The a, 26b, and 26c are divided and arranged in a ring-shaped recess 16a formed in the peripheral portion of the armature 16. In this example, as the friction material, the base material is aramid fiber, the binder is phenol resin, and the filler, the metal powder, the friction stabilizer, and the solid lubricant are added to them. Other materials may be used, and the material of the friction material is not particularly limited.

At both ends of each of the friction members 26a, 26b, 26c, stepped portions 27 are formed by lowering the ends in a stepwise manner. The flanges 28a at both ends of the fixing member 28 are placed on the step portion 27. The fixing member 28 is provided with a through hole 28b in the center thereof, and is fixed to the armature 16 by inserting the rivet 18 into the through hole 28b and caulking it. That is,
The rivet 18 is inserted through the through hole 19a at one end of the leaf spring 19, the through hole 16b of the armature 16 and the through hole 28b of the fixing member 28, and these tips are caulked to integrate them.

In the state where the friction members 26a, 26b, 26c are fixed,
The fixed member 28 is provided with the step portion 27 so that the friction member 26
When it is mounted lower than the surfaces of a, 26b, and 26c and is attracted to the friction surface 15 of the clutch rotor 13, it does not come into contact with the friction surface 15.

The rivet 22 is inserted through the through hole 23a of the stopper 23, the through hole 19b at the other end of the leaf spring 19, and the washer 29, and
It is press-fitted into the through hole 21a of the hub 21 to integrate them.

FIG. 4 is a sectional view of an electromagnetic clutch according to another embodiment of the invention as set forth in claim 1, FIG. 5 is a rear view of the armature of the embodiment as seen from the clutch rotor side, and FIG. It is an exploded perspective view of a part.

With reference to FIGS. 4 to 6, also in the case of this embodiment, the friction material is composed of three friction members 26a, 26b, 26c. These friction members 26a, 26b, 26c are formed in upper and lower two stages of an upper step portion 30 and a lower step portion 31.

In the case of this embodiment, the friction members 26a, 26b, 26c are the stoppers 2
It is pressed against the armature 16 from the 3rd side. At this time, the upper step portion 30 of each of the friction members 26a, 26b, 26c is fitted into the slit 32 formed in the peripheral portion of the armature 16, and one end surface thereof is flush with the friction surface 17 of the armature 16. On the other hand, the lower step portion 31 of each friction member 26a, 26b, 26c is housed in a recess formed on the side surface of the stopper 23 of the armature 16,
One end surface of the armature 16 is flush with the end surface of the armature 16 on the stopper 23 side.

The fixing member 28 is formed in substantially the same shape as the armature 16, and presses the friction members 26a, 26b, 26c on the armature 16.

The rivet 18 includes a through hole 19a at one end of the leaf spring 19 and a fixing member 2
The through hole 28b of 8 and the through hole 16b of the armature 16 are inserted, and the distal end portion is caulked to integrate them.

The rivet 22 is inserted through the through hole 23a of the stopper 23, the through hole 19b at the other end of the leaf spring 19, and the washer 29, and
It is press-fitted into the through hole 21a of the hub 21 to integrate them.

FIG. 7 is a sectional view of an electromagnetic clutch according to an embodiment of the invention as set forth in claim 2, FIG. 8 is a rear view of the armature of the embodiment as seen from the clutch rotor side, and FIG. 9 is a main part of the embodiment. FIG.

Referring to FIGS. 7 to 9, in the case of this embodiment, the friction material
26 is not divided but has a ring shape. This friction material
26 is housed in a ring-shaped recess 16a formed in the armature 16.

The fixing member 28 has a ring shape and presses the friction material 26 against the armature 16. The fixing member 28 is housed in a recess 41 formed in the friction surface 40 of the friction material 26, and its end face does not protrude from the friction surface 40.

The rivet 18 is inserted into the through hole 19a at one end of the leaf spring 19, the through hole 16b of the armature 16 and the through hole 42 of the friction material 26, and its tip is press-fitted into the through hole 28b of the fixing member 28. , These are designed to be integrated.

The rivet 22 is inserted through the through hole 23a of the stopper 23, the through hole 19b at the other end of the leaf spring 19, and the washer 29, and
It is press-fitted into the through hole 21a of the hub 21 to integrate them.

(Effects of the Invention) The present invention can reliably secure the friction material to the armature at low cost.

Therefore, the present invention has high productivity and can reduce the cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an electromagnetic clutch according to an embodiment of the invention described in claim 1, FIG. 2 is a rear view of the armature of the embodiment as seen from the clutch rotor side, and FIG. 3 is a main part of the embodiment. FIG. 4 is a sectional view of an electromagnetic clutch according to another embodiment of the invention as set forth in claim 1, FIG. 5 is a rear view of the armature of the same embodiment seen from the clutch rotor side, and FIG. FIG. 7 is an exploded perspective view of a main part of the embodiment, FIG. 7 is a sectional view of an electromagnetic clutch according to an embodiment of the invention described in claim 2, and FIG. 8 is a rear view of the armature of the embodiment viewed from the clutch rotor side. FIG. 9 is an exploded perspective view of the main part of the same embodiment. 13 …… Clutch rotor, 16 …… Armature, 18 …… Rivet, 19 …… Leaf spring, 20 …… Driven shaft, 21 …… Hub,
22 …… Rivet, 23 …… Stopper, 24 …… Electromagnet, 26
...... Friction material, 26a, 26b, 26c ...... Friction member, 28 ...... Fixed member.

Claims (2)

[Scope of utility model registration request] 1. A clutch rotor which is rotatable about an axis and is rotationally driven by an external drive source, and an armature which is disposed opposite to an axial end surface of the clutch rotor and is movable in a direction parallel to the axis. An elastic support that elastically supports the armature on a driven shaft, an electromagnet that includes the clutch rotor and the armature in a magnetic circuit, and selectively connects and disconnects the armature to and from the clutch rotor, and one surface of the armature. In the electromagnetic clutch including the friction material fixed so as to be flush with the clutch rotor side end surface of the clutch, the friction material is composed of a plurality of friction members, and the friction members are divided and arranged in the armature. And the friction member is pressed against the armature by a fixing member, and the fixing member includes the elastic support member and the elastic support member. Electromagnetic clutch, characterized in that it is fixed to the armature by a rivet for fixing the Machua. 2. A clutch rotor which is rotatable about one axis and is rotationally driven by an external drive source, and an armature which is arranged opposite to an axial end surface of the clutch rotor and is movable in a direction parallel to the one axis. An elastic support that elastically supports the armature on a driven shaft, an electromagnet that includes the clutch rotor and the armature in a magnetic circuit, and selectively connects and disconnects the armature to and from the clutch rotor, and one surface of the armature. In the electromagnetic clutch including a friction material fixed so as to be flush with the clutch rotor side end surface of the, the friction material is pressed against the armature by a fixing member, and the fixing member is
An electromagnetic clutch, characterized in that it is integrated with the friction member by the rivets for fixing the elastic support member to the armature together with the armature.