JP2011174552A - Electromagnetic clutch mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic clutch mechanism reducing electric power consumption when holding a disengagement condition or an engagement condition. <P>SOLUTION: The electromagnetic clutch mechanism transmits power between a first rotating member 80 and a second rotating member 60 and can be switched over between the engagement condition and the disengagement condition. The electromagnetic clutch mechanism includes a first coil 100 switching between the engagement condition and the disengagement condition by driving the first rotating member so that it moves relatively to the second rotation member in the rotation axis direction, and a second coil 120 fitting a movable fitting member 110, which rotates together with the first rotating member and is movable in a direction orthogonal to the rotation axis, to a fitting portion 81 formed on the first rotating member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electromagnetic clutch mechanism capable of switching between transmission and disconnection of rotational power, and particularly relates to an electromagnetic clutch mechanism that reduces power consumption when maintaining an engagement release state or an engagement state.

  In a water-cooled engine mounted on an automobile, cooling water is circulated by a water pump driven by the output of the engine to cool the combustion chamber. Conventionally, between the cold start of the engine and the end of the warm-up operation, the cooling water flow rate to the radiator, which is a heat exchanger, is limited by a thermostat so that the temperature of the cooling water rises early. I was doing.

In recent years, it has been proposed to stop the water pump during the warm-up operation, thereby reducing the loss in driving the auxiliary equipment of the engine and improving the fuel consumption. In order to stop the water pump during the operation of the engine, for example, it is conceivable to use an electromagnetic clutch mechanism that has been conventionally used to switch on and off an air conditioner driven by the engine.
For example, in Patent Document 1, an armature is provided on the outer end side of a leaf spring protruding to the outer diameter side from an armature hub provided on a rotating shaft, and the armature and the pulley are energized by a coil energizing state facing the armature with the pulley interposed therebetween. And an electromagnetic clutch device that switches between crimping and separation.

Japanese Patent Application Laid-Open No. 61-206827

When the electromagnetic clutch mechanism as described above is applied to the water pump, the water pump needs to be driven at all times except during the warm-up operation. It is conceivable to adopt a negative operation type configuration.
However, with such a configuration, it is necessary to continue energization of the coil while the clutch is disengaged, and further, a thrust that overcomes the leaf spring that generates the clutch pressing force is required. The amount of power to be increased. For this reason, there is a concern that the work load of the alternator, which is a generator driven by the engine, increases and fuel consumption deteriorates.
Further, even in a positive operation type electromagnetic clutch mechanism that is used for driving an auxiliary device such as a compressor and is engaged only while the coil is energized, it is desired to reduce power consumption when maintaining the engaged state. Yes.
The subject of this invention is providing the electromagnetic clutch mechanism which reduced the power consumption at the time of hold | maintaining a fastening cancellation | release state or a fastening state.

The present invention solves the above-described problems by the following means.
The invention of claim 1 is an electromagnetic clutch mechanism capable of transmitting power between a first rotating member and a second rotating member, and capable of switching between a fastening state and a fastening release state. A first coil that drives the rotating member to move relative to the second rotating member in the direction of the rotation axis to switch between the fastened state and the fastened state, and rotates together with the first rotating member; A second coil for fitting a movable fitting member movable in a direction orthogonal to the rotation axis to a fitting portion formed on the first rotating member, and the fitting of the movable fitting member The electromagnetic clutch mechanism is characterized in that energization of the first coil is stopped when fitted to the joint.

The invention according to claim 2 is the electromagnetic clutch mechanism according to claim 1, wherein the movable fitting member is attached via the second coil and a spring element.
The invention according to claim 3 is characterized in that the first rotating member moves to a position where the movable fitting member can be fitted to the fitted portion when the first coil is energized. The electromagnetic clutch mechanism according to claim 1 or claim 2.

According to the present invention, the following effects can be obtained.
(1) After the first rotating member is driven by the first coil, the movable coil member is fitted to the fitted portion by the second coil, and thereafter the energization of the first coil is stopped. Also, the position of the first rotating member can be maintained, and the engagement release state or the engagement state of the electromagnetic clutch mechanism can be maintained. At this time, since the energization amount of the second coil can be made smaller than that of the first coil that causes the clutch operation, the power consumption of the entire electromagnetic clutch mechanism can be reduced. When applied to accessories, fuel consumption can be improved.
(2) By attaching the movable fitting member and the second coil via the spring element, when the energization of the second coil is stopped, the movable fitting member automatically returns to the position before the energization is started by the spring element. To do. For this reason, fitting and non-fitting of the movable fitting member can be switched with a simple configuration.
(3) The first rotating member moves to a position where the movable fitting member can be fitted to the fitted portion when the first coil is energized. The energization to the coil can be stopped and the power consumption can be reduced.

It is sectional drawing of the Example of the electromagnetic clutch mechanism to which this invention is applied, and the water pump provided with this, Comprising: It is a figure which shows a clutch fastening state. It is the II section expanded sectional view of FIG. FIG. 3 is an enlarged cross-sectional view of a main part showing a clutch engagement / release state of the electromagnetic clutch mechanism of Embodiment 1, and shows a cross-section corresponding to FIG. 2. It is sectional drawing which shows the clutch fastening state in the electromagnetic clutch mechanism which is a comparative example of this invention. It is sectional drawing which shows the clutch fastening release state in the electromagnetic clutch mechanism of FIG.

  An object of the present invention is to provide an electromagnetic clutch mechanism that reduces power consumption when maintaining an engagement release state or an engagement state. After the plate is separated from the pulley by the first coil, the second coil is used to form a recess in the plate. The problem was solved by inserting a fitting pin and then stopping energization of the first coil.

Embodiments of an electromagnetic clutch mechanism to which the present invention is applied will be described below.
The electromagnetic clutch mechanism of the embodiment is of a negative operation type that switches between driving and stopping of a water pump that pumps cooling water of an automobile engine.
As shown in FIG. 1, the water pump 1 includes a housing 10, a shaft 20, a bearing 30, an impeller 40, a mechanical seal 50, a pulley 60, a bearing 70, and the like, and further includes a plate 80, a leaf spring 90, and a first coil 100. And an electromagnetic clutch mechanism including a fitting pin 110, a second coil 120, and the like.

The housing 10 is a casing of the water pump 1 formed by casting an aluminum alloy or the like, for example. A water channel 11 through which cooling water circulates is formed inside the housing 10.
The housing 10 is integrally formed with a bearing seat 12 to which the bearing 30 and the bearing 70 are attached, a coil seat 13 to which the first coil 100 is attached, and the like.

The bearing seat 12 is formed in a cylindrical shape concentric with the shaft 20 and is disposed so as to protrude from the portion of the housing 10 where the water passage 11 is provided to the pulley 60 side.
An outer ring 31 of the bearing 30 is fixed to the inner peripheral surface portion of the bearing seat 12. An inner ring 71 of the bearing 70 is fixed to the outer peripheral surface portion of the bearing seat 12.
The coil seat 13 is a portion that is disposed on the outer diameter side of the bearing seat 12 and the bearing 70 and holds the first coil 100 in a state of being inserted into the interval between the outer cylinder portion 61 and the inner cylinder portion 62 of the pulley 60.

The shaft 20 is a rotating shaft that is rotatably supported by the bearing 30 with respect to the housing 10. One end of the shaft 20 is inserted into the water channel 11 side of the housing 10 and an impeller 40 is attached. The other end of the shaft 20 is disposed so as to protrude from the bearing seat 12 to the outside, and a leaf spring 90 of an electromagnetic clutch mechanism is attached to the protruding end.
A fitting pin seat 21 that holds the fitting pin 110 is formed on the shaft 20. The fitting pin seat 21 is a block-like portion protruding from the outer peripheral surface of the shaft 20 to the outer diameter side.

The bearing 30 supports the shaft 20 so as to be rotatable with respect to the bearing seat 12 of the housing 10.
As shown in FIG. 2 and the like, the bearing 30 is a double row deep groove ball bearing having an outer ring 31 fixed to the inner diameter side of the bearing seat 12 and a steel ball 32 as a rolling element. In addition, an inner raceway surface on which the steel ball 32 is guided is formed on the outer peripheral surface of the shaft 20 and serves as an inner ring.

  The impeller 40 is an impeller that is attached to an end portion of the shaft 20 on the water channel 11 side and that pumps cooling water.

  The mechanical seal 50 seals between the bearing 30 and the impeller 40 between the outer peripheral surface of the shaft 20 and the inner peripheral surface of the bearing seat 12 of the housing 10 to prevent the coolant from leaking while allowing the shaft 20 to rotate. To do.

The pulley 60 is a second rotating member according to the present invention to which a driving force from an engine (not shown) is input via a belt.
The pulley 60 is formed by integrally forming an outer cylinder portion 61, an inner cylinder portion 62, and an end surface portion 63.
The outer cylinder portion 61 is a cylindrical portion that is provided at the outer end portion of the pulley 60 and around which the belt is wound.
The inner cylinder part 62 is a cylindrical part that is concentrically arranged on the inner diameter side of the outer cylinder part 61 and into which the outer ring of the bearing 70 is press-fitted.
The end surface portion 63 is a flat plate-like portion that connects between the end portions of the outer cylinder portion 61 and the inner cylinder portion 62 on the plate 80 side, and is formed in a disk shape having an opening at the center.

The bearing 70 supports the pulley 60 to be rotatable with respect to the bearing seat 12 of the housing 10.
As shown in FIG. 2 and the like, the bearing 70 includes an inner ring 71 fixed to the outer diameter side of the bearing seat 12, an outer ring 72 fixed to the inner diameter side of the inner cylindrical portion 62 of the pulley 60, and steel that is a rolling element. This is a double row deep groove ball bearing having a sphere 73.

The plate 80 is a flat plate-like member disposed so as to face the end surface portion 63 of the pulley 60. The plate 80 is a first rotating member referred to in the present invention. When the electromagnetic clutch mechanism is fastened, the plate 80 is pressed against the end face portion 63 of the pulley 60 to transmit power. The plate 80 is formed in a disc shape having a circular opening at the center, and is disposed concentrically with the shaft 20.
The plate 80 is a magnetic body that is driven in a direction away from the end face portion 63 by energizing the first coil 100.
At the inner diameter side end of the plate 80, a recess 81 is formed as a fitted portion into which the fitting pin 110 is inserted and fitted.

  The leaf spring 90 connects the outer peripheral surface of the shaft 20 and the inner peripheral edge portion of the plate 80, and presses the plate 80 against the end surface portion 63 of the pulley 60 when the electromagnetic clutch mechanism is engaged by the biasing force.

The first coil 100 is attached to the coil seat 13 of the housing 10 and is disposed at a distance between the outer cylinder part 61 and the inner cylinder part 62 of the pulley 60. The first coil 100 is disposed to face the plate 80 with the end surface portion 63 of the pulley 60 interposed therebetween. The first coil 100 is fitted and fixed in a recess formed by recessing the side surface of the coil seat 13 on the plate 80 side. The wiring for supplying power to the first coil 100 is drawn out from an opening formed so as to penetrate from the recess to the opposite side.
The first coil 100 drives the plate 80 in a direction away from the pulley 60 by being energized during the release operation of the electromagnetic clutch mechanism.

The fitting pin 110 is inserted into the concave portion 81 of the plate 80 when the electromagnetic clutch mechanism is in a release state, so that the movable pin 110 holds the position of the plate 80 even when the energization of the first coil 100 is stopped. It is a joint member.
The fitting pin 110 is formed in a column shape extending in the radial direction of the shaft 20 and is inserted into the fitting pin seat 21 of the shaft 20. The fitting pin 110 is movable relative to the fitting pin seat 21 in the axial direction of the shaft 20.
The front end portion of the fitting pin 110 slightly protrudes from the fitting pin seat 21 of the shaft 20 and is spaced from the inner peripheral edge portion of the plate 80 in the engaged state of the electromagnetic clutch mechanism shown in FIGS. Has been placed.
Further, when the electromagnetic clutch mechanism shown in FIG. 3 is disengaged, the fitting pin 110 is inserted into the recess 81 of the plate 80 so that the shaft 20 and the plate 80 are not relatively displaced in the axial direction. To do.
The fitting pin 110 is made of a magnetic material, and receives thrust in a direction that is fed from the fitting pin seat 21 by energizing the second coil 120.

The second coil 120 drives the fitting pin 110 so as to protrude from the fitting pin seat 21 of the shaft 20 to the radially outer side of the shaft 20 when energized.
The second coil 120 is provided inside the fitting pin seat 21 and is disposed to face the end portion of the fitting pin 110 on the center side of the shaft 20.
The wiring for supplying power to the second coil 120 is drawn out to the bearing 30 side through an opening formed in the fitting pin seat 21.
The wiring drawn out from the fitting pin seat 21 is always electrically connected to a wiring (not shown) whose wiring end is installed in the bearing seat 12 regardless of the rotation of the second coil 120 via a slip ring (not shown). ing. As a result, power can be supplied to the second coil 120 that rotates together with the shaft 20.
The second coil 120 and the fitting pin 110 are connected by a return spring 121. The return spring 121 pulls the fitting pin 110 back to the initial position shown in FIG. 2 when the energization of the second coil 120 is stopped.

Next, operation | movement of the water pump 1 of the Example mentioned above is demonstrated.
The water pump 1 is stopped only during the warm-up operation after the cold start during the operation of the engine, and is almost always driven during other normal operations.
While the water pump 1 is being driven, the electromagnetic clutch mechanism is engaged as shown in FIGS. At this time, energization of both the first coil 100 and the second coil 120 is stopped.
At this time, the concave portion 81 of the plate 80 is in a position shifted in the rotation axis direction of the shaft 20 with respect to the fitting pin 110, and the fitting pin 110 cannot be inserted.

When the water pump 1 is stopped, first, the first coil 100 is energized to drive the plate 80 away from the pulley 60 as shown in FIG. As a result, the concave portion 81 of the plate 80 is positioned so that the position along the rotational axis direction of the shaft 20 substantially coincides with the fitting pin 110, and the fitting pin 110 can be inserted.
Next, when the second coil 120 is energized, the fitting pin 110 is fed out from the fitting pin seat 21 of the shaft 20, and the distal end portion of the fitting pin 110 is inserted into the recess 81 of the plate 80.
Thereafter, the energization of the first coil 100 is stopped, and the plate 80 is held in a state of being separated from the pulley 60 (a state where the electromagnetic clutch mechanism is released) by the fitting pin 110. At this time, energization to the second coil 120 is continued.

When returning the water pump 1 from the stopped state to the driving state (returning the electromagnetic clutch mechanism from the engaged release state to the engaged state), the energization of the second coil 120 is stopped.
At this time, the fitting pin 110 is pulled into the fitting pin seat 21 of the shaft 20 by the tensile force of the return spring 121, and the fitting between the fitting pin 110 and the concave portion 81 of the plate 80 is released.
Then, the plate 80 is moved to the pulley 60 side by the urging force of the leaf spring 90 and is crimped to the end surface portion 63, and the electromagnetic clutch mechanism is brought into an engaged state.

Next, the effect of the above-described embodiment will be described in comparison with a comparative example of the present invention described below. In the description of the comparative example, portions that are substantially the same as those in the embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.
The water pump 2 of the comparative example shown in FIGS. 4 and 5 is not provided with the fitting pin 110 and the second coil 120 in the embodiment. Accordingly, the fitting pin seat 21 of the shaft 20, the recess 81 of the plate 80, the return spring 121, etc. are not provided.
The electromagnetic clutch mechanism provided in the water pump 2 is a so-called negative operation type clutch that continues to energize the coil when the engagement is released (disconnected).

In the comparative example, in the driving state of the water pump 2 shown in FIG. 4 (the electromagnetic clutch mechanism being engaged), the energization of the first coil 100 is stopped, and the plate 80 has the end surface portion 63 of the pulley 60 by the urging force of the leaf spring 90. It is crimped to.
In the stop state of the water pump 2 shown in FIG. 5 (the state in which the electromagnetic clutch mechanism is released), the energization of the first coil 100 is continued, and the plate 80 is separated from the pulley 60 by the thrust of the first coil 100. Maintain state.
Here, since the thrust generated by the first coil 100 needs to overcome the urging force of the leaf spring 90, it is necessary to supply a certain amount of electric power to the first coil 100.

On the other hand, according to the present embodiment, when the engagement state of the electromagnetic clutch mechanism is maintained, the energization of the second coil 120 is continued, but the energization of the first coil 100 can be stopped. Here, since the thrust that the second coil 120 acts on the fitting pin 110 only needs to overcome the biasing force of the return spring 121 and the friction between the members, the power consumption of the second coil 120 is the power of the first coil 100. The power consumption is significantly smaller than the power consumption, and the engaged state of the electromagnetic clutch mechanism can be maintained with less power consumption.
In addition, since the fitting pin 110 is pulled into the fitting pin seat 21 by the return spring 121 when the energization to the second coil 120 is stopped, the fitting pin can be protruded and retracted with a simple configuration. .

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The shape, structure, material and the like of each member constituting the electromagnetic clutch mechanism are not limited to those of the above-described embodiments, and can be changed as appropriate.
(2) The electromagnetic clutch mechanism of the present invention is not limited to the water pump as in the embodiment, but can be applied to various pumps, compressors, other auxiliary components for automobile engines, and other uses.
(3) The electromagnetic clutch mechanism of the embodiment is configured to fit the movable fitting member and the rotating member at the time of releasing the engagement. For example, when the frequency in the engaged state is lower than the engaged state, the electromagnetic clutch It is good also as a structure which makes a mechanism a normal action type and makes a movable fitting member fit in this state, after crimping | bonding the 1st and 2nd rotation member with a 1st coil. In this case, when energization of each coil is stopped, the first and second rotating members are maintained in a separated state (fastened state) by, for example, a spring element or the like.

1 Water pump (Example) 2 Water pump (Comparative example)
DESCRIPTION OF SYMBOLS 10 Housing 11 Waterway 12 Bearing seat 13 Coil seat 20 Shaft 21 Fitting pin seat 30 Bearing 31 Outer ring 32 Steel ball 40 Impeller 50 Mechanical seal 60 Pulley 61 Outer cylinder part 62 Inner cylinder part 63 End surface part 70 Bearing 71 Inner ring 72 Outer ring 73 Rolling body 80 Plate 81 Recess 90 Plate Spring 100 First Coil 110 Fitting Pin 120 Second Coil 121 Return Spring

Claims (3)

An electromagnetic clutch mechanism that transmits power between the first rotating member and the second rotating member and is capable of switching between a fastening state and a fastening release state,
A first coil that drives the first rotating member to move relative to the second rotating member in the rotation axis direction to switch between the fastening state and the fastening release state;
A second coil for fitting a movable fitting member that rotates together with the first rotating member and is movable in a direction orthogonal to the rotation axis to a fitted portion formed in the first rotating member; ,
An electromagnetic clutch mechanism, wherein energization of the first coil is stopped when the movable fitting member is fitted to the fitted portion. The electromagnetic clutch mechanism according to claim 1, wherein the movable fitting member is attached via the second coil and a spring element. The first rotating member moves to a position where the movable fitting member can be fitted to the fitted portion when the first coil is energized. Electromagnetic clutch mechanism.

Images