JP2001323948A - Electromagnetic clutch mechanism and vehicular auxiliary machine having the same mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic clutch mechanism that is highly producible and rational, and a vehicular auxiliary machine having the mechanism. SOLUTION: The electromagnetic spring clutch for use in a water pump heater as a vehicular auxiliary machine is so constructed that a bulkhead portion 2b of a front housing 2 integrally has a stator 5 in which an electromagnetic coil 5a is housed. The number of parts and the number of assembly steps can be reduced, and the coaxiality of the stator 5 can be improved in relation to the front housing 2. A length t1 of the stator 5 can be shortened and a wall thickness t2 of the bulkhead portion 2b can be thinned to improve mounting work and to promote heat conduction from the electromagnetic coil 5a to a jacket water W side by way of the bulkhead portion 2b and maximally prevent a reduction in the attractive force of the electromagnetic coil 5a by overheat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic clutch, and more particularly to an electromagnetic clutch used for intermittently driving a vehicle accessory such as a water pump heater or a compressor by a drive source.

[0002]

2. Description of the Related Art For example, an electromagnetic spring clutch used for automotive accessories such as a water pump heater and a compressor disclosed in Japanese Patent Publication No. DE 3147468 connects an input pulley and an output hub as necessary.
It is configured to transmit a rotational driving force from the engine to a rotating shaft of an auxiliary machine for an automobile via an input pulley and an output hub. Conventionally, this type of electromagnetic spring clutch includes an electromagnetic coil on the side of an input pulley that rotates by receiving rotational driving force from an engine. Further, an armature is provided on the output hub side provided on the rotating shaft of the automobile auxiliary machine so as to be attracted or detached from the input pulley side in response to energization or interruption of energization to the electromagnetic coil. In addition, one end is connected to the armature, and the other end is connected to the output hub, and includes a coil spring disposed on a winding surface set on the input pulley and the output hub. Then, when the armature is attracted to the input pulley by energizing the electromagnetic coil, the coil spring is wound around the winding surface of the input pulley and the output hub, and the rotational torque of the input pulley is transmitted to the automobile through the output hub by the tightening force. It is transmitted to the rotating shaft of the auxiliary machine.

[0003]

In the above-mentioned conventional electromagnetic spring clutch, the stator accommodating the electromagnetic coil is fixed to a front housing of an auxiliary machine for an automobile, and the stator and the front housing are formed separately. I have. This required a stop (circlip) for fixing the stator to the front housing. As described above, the conventional electromagnetic spring clutch has a problem that the number of parts and the number of steps of assembling the stator are large, and the productivity is low.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a high-productivity and reasonable electromagnetic clutch mechanism and a vehicle accessory equipped with the mechanism. It is to be.

[0005]

According to the present invention, there is provided an electromagnetic clutch mechanism according to the present invention, and a vehicle accessory provided with the mechanism. I have. Here, the terms described in each claim and the detailed description of the invention are interpreted as follows unless otherwise limited. (1) The “vehicle” includes various vehicle bodies such as trains and trains, in addition to automobiles. (2) In addition to the water pump heater,
Includes compressors, viscous heaters, etc.

According to the electromagnetic clutch mechanism of the first aspect, the stator for fixing the stator is formed by integrally forming the stator accommodating the electromagnetic coil and the support member provided on the vehicle auxiliary machine. Since the number of parts and the number of assembling steps can be reduced without necessity, productivity is improved. In addition, when the stator and the support member are configured separately, a predetermined thickness is required to secure the strength of each. It is possible to make the thickness of the portion of the stator and the support member thinner than in the case where the body is formed. Therefore, the electromagnetic clutch mechanism can be configured to be particularly short in the axial direction, and the mountability can be improved. Further, by forming the stator and the support member integrally, the coaxiality of the stator with respect to the support member can be improved.

Here, the electromagnetic clutch mechanism is provided on a vehicle accessory having a heat receiving portion for receiving heat generated from the electromagnetic coil on the side of the support member opposite to the stator. Is preferred. Thereby, the heat generated from the electromagnetic coil is conducted to the supporting member by the thinning of the portion of the supporting member from the stator, and is removed by the heat receiving portion, so that the electric heating coil is cooled.
Therefore, it is possible to minimize overheating which causes a decrease in the attractive force of the electromagnetic coil.

It is preferable that a heat receiving fluid is passed through the heat receiving portion. For example, when a stator is integrally provided in a front housing (support member) of a water pump heater (vehicle auxiliary machine), heat generated from an electromagnetic coil and conducted to the front housing is transferred to a counter-stator of the front housing. Heat is easily received by the jacket water (heat receiving fluid) on the side. Thereby, the heat generated from the electromagnetic coil is effectively removed by the jacket water, and the electric heating coil can be efficiently cooled.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electromagnetic clutch mechanism of the present invention and a vehicle accessory equipped with the electromagnetic clutch mechanism will be described below. In the present embodiment, an electromagnetic clutch mechanism provided in a water pump heater, which is an auxiliary machine for an automobile, will be described.

First, the configuration and the like of an electromagnetic spring clutch according to an embodiment of the present invention will be described with reference to FIG. Here, FIG. 1 is a longitudinal sectional view of an electromagnetic spring clutch according to one embodiment of the present invention, and shows a state provided in a water pump heater. As shown in FIG. 1, a substantially cylindrical input pulley 1 as an input-side member is a front housing 2 of a water pump heater, which is an auxiliary machine for an automobile, for example, provided as a heating auxiliary (corresponding to a support member in the present invention). Small diameter cylindrical portion 2 formed at one end of
a is rotatably supported by the bearing 3 on the outer periphery of the a.
Then, a rotational driving force of an engine (not shown) as a driving source is taken out via a V-belt, and the input pulley 1 is driven by the rotational driving force. The input pulley 1 is made of a magnetic material, for example, a steel material, and is subjected to a chromate treatment for rust prevention.

The input pulley 1 has a cylindrical portion 1a that protrudes concentrically from one (left side in the drawing) side toward the opposite front housing 2 (left side in the drawing), and the outer periphery of the cylindrical portion 1a. The surface constitutes a winding surface of the coil spring 4. Further, a stator 5 (axial length t1) accommodating an annular electromagnetic coil 5a is integrally provided in the front housing 2, and the stator 5 is provided on the other side (the right side in the drawing) of the input pulley 1. It is inserted into an annular concave groove 1b formed on the side surface. Also, a minute gap is formed between the concave groove 1b and the outer peripheral surface of the stator 5,
Therefore, when the input pulley 1 rotates, the concave groove 1b
And the stator 5 do not come into contact with each other.

A water passage portion (corresponding to the heat receiving portion in the present invention) through which jacket water W (corresponding to the heat receiving fluid in the present invention) of the water pump heater flows is provided on the side of the front housing 2 opposite to the stator. Is provided). Here, the side opposite to the stator of the front housing 2 corresponds to the side opposite to the stator of the support member according to the present invention. Thereby, the high-temperature side heat generated when the electromagnetic coil 5a is energized conducts heat through the partition wall portion 2b of the front housing 2 having the thickness t2 and moves to the low-temperature side jacket water W side. Therefore, the electromagnetic coil 5a is cooled, and it is possible to prevent the attraction force of the electromagnetic coil 5a from being reduced by overheating.

The output hub 7 as an output side member has a cylindrical portion 7a and a flange portion 7b, and the cylindrical portion 7a is spline-fitted to an outer peripheral end of a pump shaft 8 of a water pump heater.
It is fixed by a bolt 10 via a thick washer 9 and is prevented from falling off. The outer peripheral surface of the flange portion 7b of the output hub 7 is aligned with the outer peripheral surface of the cylindrical portion 1a of the input pulley 1 to form a winding surface of the coil spring 4. Also,
An electromagnetic coil 5 is provided on the side surface of the input pulley 1 on the side of the cylindrical portion 1a.
A ring-shaped armature 11 is arranged to face a.

A coil spring 4 as a torque transmitting member is arranged on a winding surface formed by the outer peripheral surface of the cylindrical portion 1a of the input pulley 1 and the outer peripheral surface of the flange portion 7b of the output hub 7. One end of the spring 4 is hooked and coupled to a concave portion formed on the inner peripheral side of the armature 11, and the other end is coupled to a concave portion formed on the outer peripheral side of the flange portion 7b.

The output hub 7, the coil spring 4 and the armature 11 are covered by a spring cover 12. That is, the spring cover 12
Is formed in a shape having a cylindrical portion 12a and a flange portion 12b capable of wrapping the above three components from outside.
The flange portion 7 of the output hub 7 is formed by the cylindrical portion 12a.
The outer peripheral portion is arranged so as to wrap around the side surface of the coil spring 4 from outside, and the peripheral portion is fastened by a plurality of bolts 13 in a state of being superimposed on the side surface of the flange portion 7b.

The flange 12b of the spring cover 12
The armature 11 has an outer peripheral edge protruding in a cylindrical shape in the axial direction, and an armature 11 is fitted on the inner peripheral surface of the cylindrical portion so as to be slidable in the axial direction. On the surface of the armature 11 facing the spring cover 12, magnets 14 are attached at a plurality of locations on the circumference. Therefore, when the electromagnetic coil 5a is not energized, the armature 11 is attracted to the flange 12b of the spring cover 12 via the magnet 14.

Next, the operation of the electromagnetic spring clutch configured as described above will be described. First, in the state where the electromagnetic coil 5a is not energized, the magnet 14 is attracted to the spring cover 12 as described above, so that air is generated between the friction surface 1c of the input pulley 1 and the friction surface 11a of the armature 11. A gap called a gap is maintained, only the input pulley 1 rotates, and the output hub 7 is stationary. When the electromagnetic coil 5a is energized in such a state,
The electromagnetic coil 5a is excited, and the friction surface 1 of the armature 11 is
1 a is attracted to the friction surface 1 c of the input pulley 1. As a result, the armature 11 is rotated, and the coil spring 4 is wound around the outer peripheral surface of the cylindrical portion 1a of the input pulley 1 and the flange portion 7b of the output hub 7, and the rotational torque of the input pulley 1 is output by the tightening force. The power is transmitted to the pump shaft 8 via the hub 7.

According to the electromagnetic spring clutch of the present embodiment configured as described above, since the stator 5 accommodating the electromagnetic coil 5a is integrally formed with the front housing 2, a fixing tool for fixing the stator 5 is also required. Not
The number of parts and the number of assembly steps can be reduced. Therefore, parts costs and assembly costs can be reduced, and productivity can be improved. Also, by forming the stator 5 integrally with the front housing 2,
The length t1 of the stator 5 can be shorter than in the case where the stator 5 is formed separately, and the thickness t2 of the partition 2b of the front housing 2 can be reduced. Therefore, the electromagnetic spring clutch can be made particularly short in the axial direction, and the mountability can be improved. Further, by shortening the length t1 of the stator 5 and reducing the thickness t2 of the partition wall portion 2b of the front housing 2, the electromagnetic coil 5
a generated on the high-temperature side through the partition wall portion 2b of the front housing 2.
Heat conduction to the side becomes easier. Therefore, it is possible to cool the electromagnetic coil 5a and to prevent the attraction force of the electromagnetic coil 5a from being reduced by overheating as much as possible. In particular, since the heat generated from the electromagnetic coil 5a is configured to be removed by the jacket water W in the water passage section, the electromagnetic coil 5a can be efficiently cooled. Further, when a water pump heater is adopted as a vehicle accessory as in the present embodiment,
The heat generated from the electromagnetic coil 5a can be effectively used for heating. Further, by forming the stator 5 integrally with the front housing 2, the coaxiality of the stator 5 with respect to the front housing 2 can be improved. Therefore, the rotors such as the input pulley 1 and the bearing 3 can be easily manufactured.

It should be noted that the present invention is not limited to only the above-described embodiment, and various applications and modifications are conceivable. For example, each of the following embodiments to which the above embodiment is applied may be implemented.

In the above embodiment, the electromagnetic spring clutch is provided in the water pump heater, and the heat generated by the electromagnetic coil 5a is transferred to the jacket water W (heat receiving fluid) side of the water pump heater via the partition 2b of the front housing 2. Although the case of conducting heat has been described, the form of the heat receiving portion that receives heat generated by the electromagnetic coil 5a is not limited, and can be variously changed as necessary. For example, when an electromagnetic spring clutch is provided in a viscous heater, which is one of vehicle accessories, heat generated by an electromagnetic coil is used as a heat receiving fluid that flows through a housing. Can be configured to be removed.

In the above embodiment, the case where the torque is transmitted by the spring type electromagnetic clutch (electromagnetic spring clutch) is described, but the form of the torque transmission is not limited to the spring type. For example, the present invention can be applied to various types of electromagnetic clutch mechanisms such as a friction type, a mesh type, and a gap type.

[0022]

As described above, according to the present invention,
It is possible to realize a highly productive and rational electromagnetic clutch mechanism and a vehicle accessory equipped with the mechanism.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic spring clutch according to an embodiment of the present invention, showing a state provided in a water pump heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Input pulley 2 ... Front housing, 2b ... Partition wall part 4 ... Coil spring 5 ... Stator, 5a ... Electromagnetic coil 7 ... Output hub 8 ... Pump shaft 11 ... Armature 12 ... Spring cover W ... Jacket water

Claims (3)

[Claims] 1. An electromagnetic clutch mechanism comprising an electromagnetic coil, a stator accommodating the electromagnetic coil, and a support member provided on a vehicle accessory and supporting the stator, wherein the stator includes the support member. An electromagnetic clutch mechanism which is provided integrally with the electromagnetic clutch. 2. A vehicle accessory equipped with the electromagnetic clutch mechanism according to claim 1, wherein a heat receiving portion is provided on a side of the support member opposite to the stator,
An auxiliary machine for a vehicle, wherein heat generated from the electromagnetic coil is exchanged with the heat receiving portion via the support member. 3. The vehicle accessory according to claim 2, wherein a heat receiving fluid is passed through the heat receiving portion.