JP2005204444A - Electromagnetic actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably improve and maintain the cooling efficiency of a winding coil so that the winding coil of the fixed core does not cause dielectric breakdown due to heat generation, and to assemble the fixed core and the actuator itself. The object is to obtain an electromagnetic actuator that can be easily disassembled and that can reduce costs and improve reliability.
SOLUTION: A cooling channel 14 is fitted to a projecting portion on at least one end side of a winding coil 12 which is fitted into a coil fitting recess 11 of a laminated core 10 and protrudes from both end faces of the laminated core 10. The cooling channel 14 and the winding coil 12 are integrally coupled with a molding material 15 to form a housing portion 13 integral with the winding coil 12 to constitute the fixed cores 3 and 4.
[Selection] Figure 1

Description

  The present invention relates to an electromagnetic actuator for opening and closing a valve of an in-vehicle engine control system, for example, and more particularly to an electromagnetic actuator having a cooling function.

  In general, this type of electromagnetic actuator includes a pair of fixed cores that are coaxially spaced apart from each other and a movable shaft that integrally has a movable core disposed between these fixed cores and that has a valve connected to the lower end thereof. The movable shaft has a valve-opening spring and a valve-closing spring that urges the movable core so that the movable iron core is held at a neutral position between the fixed cores.

Next, the operation will be described.
When the winding coils of the upper and lower fixed cores are alternately energized, the movable iron core is closed with the valve opening spring by the exciting force generated alternately between the upper and lower laminated cores around which the winding coils are wound. A valve connected to a movable shaft integral with the movable iron core opens and closes against the combined force of the valve spring.

  As a fixed core of such a conventional electromagnetic actuator, it is provided with a substantially E-shaped laminated core having a coil fitting recess and a coil winding fitted into the coil fitting recess, with respect to both end faces of the laminated core. A structure in which a housing member made of magnesium, aluminum, or steel is fastened with a fixing member such as a rivet, a long pin, a screw, or a bolt via a steel back plate is already known (for example, Patent Documents). 1).

Japanese Patent Laid-Open No. 11-260634 (page 4, FIGS. 1 and 2)

  Since the conventional electromagnetic actuator is configured as described above, the fixed core easily forms a gap between the laminated core and the housing member, and the gap forms a heat insulating structure between the laminated core and the housing member. Therefore, it is impossible to constantly and efficiently transmit the heat generated by the winding coil fitted to the laminated core to the housing member, resulting in a decrease in cooling efficiency of the winding coil. There is a problem that the winding coil causes dielectric breakdown due to heat generation. Further, since the laminated core, the housing member, and the back plate are fastened and joined by a fixing member such as a rivet, there is a problem that assembly of the fixed core originally takes time to assemble / disassemble the electromagnetic actuator. Furthermore, when manufacturing the fixed core, the laminated core, the housing member, and the back plate have to be processed with insertion holes such as the rivets, which increases the manufacturing cost due to increased processing steps.

The present invention has been made to solve the above-described problems, and stably improves and maintains the cooling efficiency of the winding coil so that the winding coil of the fixed core does not cause dielectric breakdown due to heat generation. Another object of the present invention is to provide an electromagnetic actuator that can be assembled, and the assembly of the fixed core and the assembly / disassembly of the actuator itself are easy, and the cost can be reduced and the reliability can be improved.

  Another object of the present invention is to obtain an electromagnetic actuator that can improve the heat dissipation effect of the winding coil, simplify the manufacturing of the fixed core while maintaining stable cooling efficiency of the winding coil, and reduce the cost. .

  In the electromagnetic actuator according to the present invention, a cooling channel is fitted to a protruding portion on at least one end side of a winding coil that is fitted into a coil fitting recess of the laminated core and protrudes from both end faces of the laminated core, and the cooling The channel and the winding coil are integrally coupled with a molding material to form a housing part integral with the winding coil.

  The electromagnetic actuator according to the present invention includes a plurality of layers disposed at predetermined intervals on a projecting portion on at least one end side of a winding coil that fits into a coil fitting recess of the laminated core and projects from both end surfaces of the laminated core. The heat conductive sheet member is integrally coupled with a molding material to form a housing part integral with the winding coil.

  According to the present invention, the cooling channel is integrally coupled to the projecting portion on at least one end side of the winding coil projecting from both end faces of the laminated core by the molding material so as to form the housing portion integral with the winding coil. As a result, there is no gap between the winding coil and the cooling channel due to the molding material, and heat generated from the winding coil is reliably transmitted to the cooling channel via the molding material. The cooling efficiency of the winding coil can be stably improved and maintained, the dielectric breakdown of the winding coil can be prevented, and the reliability of the electromagnetic actuator is improved. . In addition, as described above, the fixed core can be easily assembled simply by fitting the winding coil in which the cooling channel is integrally coupled with the molding material into the coil fitting concave portion of the laminated core. There is no need to use a rivet or the like, and the fixed core can be easily assembled and disassembled. Further, since there is no need to process insertion holes such as rivets as in the conventional example in the laminated core and the housing portion, there is an effect that the fixed core can be easily manufactured and the manufacturing cost can be reduced.

  According to the present invention, a plurality of thermally conductive sheet members arranged in layers at a predetermined interval with respect to the projecting portion on at least one end side of the winding coil projecting from both end faces of the laminated core are integrally joined by the molding material. Since the housing part integrated with the winding coil is formed, no gap is generated between the winding coil and the housing part, and the heat generation of the winding coil is prevented through the molding material. Can be efficiently transmitted to a plurality of thermal conductive sheet members, and therefore, the heat dissipation effect of the winding coil can be improved, and an abnormal temperature rise of the winding coil can be suppressed. There is an effect that the dielectric breakdown of the coil can be prevented. In addition, as described above, the fixed core can be easily assembled simply by fitting the winding coil in which the heat conductive sheet member is integrally bonded with the molding material into the coil fitting recess of the laminated core. There is no need to use rivets or the like as in the example, and there is an effect that the fixed core can be easily assembled and disassembled. Further, since there is no need to process insertion holes such as rivets as in the conventional example in the laminated core and the housing portion, there is an effect that the fixed core can be easily manufactured and the manufacturing cost can be reduced.

Embodiment 1 FIG.
FIG. 1 is a sectional view showing an electromagnetic actuator according to Embodiment 1 of the present invention.
An electromagnetic actuator 1 shown in FIG. 1 drives a valve of an on-vehicle engine control system to open and close. For example, a pair of electromagnetic actuators 1 that are press-fitted and fixed to a solid yoke 2 made of electromagnetic soft iron such as low carbon steel and arranged vertically on the same axis. The fixed cores 3 and 4 and the movable iron core 5 disposed between the fixed cores 3 and 4 are integrally provided, and the movable shaft 6 is movable in the axial direction at the center of the fixed cores 3 and 4. An engine control system valve 7 connected to the lower end of the movable shaft 6 and a pair of springs 8 and 9 for urging the movable shaft 6 to hold the movable iron core 5 in a neutral position between the fixed cores 3 and 4. The valve opening spring 8 and the valve closing spring 9 are provided.

Next, the detailed structure of the fixed cores 3 and 4 will be described with reference to FIG. FIG. 2 is an enlarged perspective view showing the upper fixed core 3 in FIG.
As shown in FIG. 2, the upper fixed core 3 includes a laminated core 10 formed by laminating substantially E-shaped electromagnetic steel sheets, and a coil fitted into a parallel coil fitting recess 11 formed in the laminated core 10. The wire coil 12 and a housing portion 13 integrally coupled to both end protruding portions of the winding coil 12 protruding from both end surfaces of the laminated core 10 are provided. The housing portion 13 is formed of a cooling channel 14 fitted to the projecting portions at both ends of the coil winding 12 and a molding material 15 such as a resin integrally bonding the cooling channel 14 to the coil winding 12. Has been.

  As described above, the cooling channel 14 integrally joined to the both ends of the winding coil 12 by the molding material 15 is exposed on the opposite surfaces of the molding material 15 to the both end surfaces of the laminated core 10, and the laminated core 10. When the winding coil 12 is fitted in the coil fitting recess 11, the exposed end face of the cooling channel 14 is joined to both end faces of the laminated core 10. The upper fixed core 3 described above and the lower fixed core 4 in FIG. 1 are closed at the upper end when the center hole portion 10a for inserting the movable shaft 6 provided in the laminated core 10 is the upper fixed core 3. In the case of the lower fixed core 4, the point which consists of a through hole differs, but other than that makes the same structure. As shown in FIG. 1, the fixed cores 3 and 4 having the same structure are arranged so that the respective laminated cores 10 are press-fitted and fixed to the solid yoke 2 and arranged vertically. The movable shaft 6 is inserted into the hole 10a so as to be movable in the axial direction.

Next, the operation will be described.
When the winding coil 12 of the upper fixed core 3 is energized, an exciting force is generated in the laminated core 10, so that the movable iron core 5 acts on the laminated core 10 as a combined force of the valve opening spring 8 and the valve closing spring 9. As a result, the valve 7 connected to the movable shaft 6 integrated with the movable iron core 5 is held in a closed state. When the coil winding 12 is deenergized from this state, the movable core 5 moves to the lower fixed core 4 side by the combined force of the valve-opening spring 8 and the valve-closing spring 9, and the movable core 5 Immediately before contact with the lower fixed core 4, the coil winding 12 of the lower fixed core 4 is energized. By the energization, the movable iron core 5 is adsorbed and held on the laminated core 10 of the lower fixed core 4 and the valve 7 is held in the valve open state. As described above, the valve 7 repeats opening and closing operations by alternately energizing the winding coil 12 of the upper fixed core 3 and the winding coil 12 of the lower fixed core 4.

  As described above, when the coil windings 12 of the upper fixed core 3 and the lower fixed core 4 are repeatedly energized, the coil windings 12 generate heat, but the generated heat is integrated with the coil winding 12. It is efficiently transmitted to the cooling channel 14 and the molding material (molding resin) 15 forming the housing part 13. That is, the coil winding 12 and the cooling channel 14 are integrally coupled by the molding material 15, and no gap is generated between the coil winding 12 and the cooling channel 14. It is efficiently transmitted to the cooling channel 14 and the molding material 15. For this reason, the cooling efficiency of the coil winding 12 is improved, and dielectric breakdown due to heat generation of the coil winding 12 can be prevented.

  According to the first embodiment described above, the coil winding 12 fitted into the coil fitting recess 11 of the laminated core 10 and the cooling channel 14 fitted to both ends of the coil winding 12 are formed into the molding material 15. Since the fixed cores 3 and 4 are configured so as to be integrally coupled with each other to form the housing portion 13 integral with the coil winding 12, a gap is generated between the winding coil 12 and the cooling channel 14. Disappears. For this reason, the heat generation of the winding coil 12 can be reliably transmitted to the cooling channel 14 via the molding material 15, and the cooling efficiency of the winding coil 12 can be stably improved and maintained. The dielectric breakdown of the winding coil 12 can be prevented, and the reliability of the electromagnetic actuator is improved. In addition, in a state in which the coil winding 12 is fitted and held in the coil fitting recess 11 of the laminated core 10, the facing surface of the molding material 15 with respect to both end faces of the laminated core 10 and the cooling channel 14 exposed on the facing surface. Since the exposed end faces of the laminated core 10 are joined to both end faces of the laminated core 10, there is no gap between the both end faces of the laminated core 10 and the cooling channel 14. The cooling efficiency is also improved.

  Further, according to the first embodiment, the fixed cores 3 and 4 can be easily formed by simply fitting the winding coil 12 in which the cooling channel 14 is integrally coupled with the molding material 15 into the coil fitting recess 11 of the laminated core 10. Since it is not necessary to assemble with a rivet or the like as in the prior art, there is an effect that the fixed cores 3 and 4 can be easily assembled and disassembled. Further, since there is no need to process rivets or the like through holes in the laminated core 10 or the housing portion 13 as in the conventional example, the fixed cores 3 and 4 can be easily manufactured, and the manufacturing cost can be reduced. There is.

Embodiment 2. FIG.
FIG. 3 is a perspective view showing a fixed core of an electromagnetic actuator according to Embodiment 2 of the present invention. The same components as those in FIGS.
In the second embodiment, in the fixed cores 3 and 4 of the electromagnetic actuator 1 according to the first embodiment, a cooling passage 16 is provided in a part of the cooling channel 14 at one end of the coil winding 12. The housing part 13 is configured to introduce and circulate the cooling medium of the engine cooling system.

  According to the second embodiment configured as described above, the heat generated by the coil winding 12 is transmitted to the cooling channel 14 and the molding material 15 of the housing portion 13, and the heat transferred is exchanged by the cooling medium flowing through the cooling passage 16. Thus, the abnormal temperature rise of the coil winding 12 can be reliably suppressed, the cooling efficiency of the coil winding 12 can be further improved, the electromagnetic actuator can be stably operated, and its reliability is improved. There is an effect of improving.

Embodiment 3 FIG.
In the second embodiment, the cooling passage 16 is provided only in the cooling channel 14 at one end of the coil winding 12, but this cooling passage 16 is provided in the cooling channel 14 at both ends of the coil winding 12. In this case, the cooling efficiency of the coil winding 12 is further improved.

Embodiment 4 FIG.
FIG. 4 is a perspective view showing a fixed core of an electromagnetic actuator according to Embodiment 4 of the present invention. The same components as those in FIGS.
In the second embodiment, the cooling channel 14 is fitted to the projecting ends of the coil winding 12 projecting from the both end surfaces of the laminated core 10 and is integrally coupled by the molding material 15, and the cooling channel 14 is connected to one of the cooling channels 14. In the fourth embodiment, the cooling channel 14 is fitted to only one of the protruding portions of the coil winding 12 and integrally joined with the molding material 15 in the fourth embodiment. 14, a cooling passage 16 is provided, and a molding material 15 is directly joined in a block shape directly to the projecting portion on the opposite side.

  According to the fourth embodiment in which the fixed cores 3 and 4 are configured in this way, the cooling channel 14 is provided only at one protruding end of the coil winding 12 and not at the opposite protruding end. The number of parts 3 and 4 is reduced, the structure is simplified, the manufacturing is facilitated, and the cost can be reduced. In addition, since the cooling channel 14 provided at one end of the coil winding 12 has a cooling passage 16, insulation by heat generation of the coil winding 12 is performed without impairing the cooling efficiency of the coil winding 12. There is an effect that a stable cooling efficiency sufficient to prevent destruction can be secured.

Embodiment 5 FIG.
FIG. 5 is a perspective view showing a fixed core of an electromagnetic actuator according to Embodiment 5 of the present invention. The same or corresponding parts as those in FIG.
In the fifth embodiment, a plurality of thermally conductive sheet members 17 are applied instead of the cooling channel 14 of the fourth embodiment. That is, at both end protrusions of the coil winding 12 that are fitted in the coil fitting recesses 11 of the laminated core 10 and protrude from both end faces of the laminated core 10, the one side protrusion is in contact with the protrusion and a predetermined A plurality of thermally conductive sheet members (for example, aluminum sheets) 17 arranged in layers at intervals are integrally coupled with a molding material 15 to form a housing portion 18 integral with one projecting portion of the coil winding 12. .

  In other words, the plurality of thermally conductive sheet members 17 arranged in layers at predetermined intervals in contact with the one-side protruding portion of the coil winding 12, and these thermally conductive sheet members 17 are connected to the coil winding 12. On the other hand, a housing part 18 that is integral with a protruding part on one side of the coil winding 12 is formed by a molding material 15 that is molded integrally with the coil part 12. In the housing portion 18, the end surface of the heat conductive sheet member 17 is exposed to the end surface of the peripheral portion of the molding material 15. A cooling passage 16 is provided in the housing portion 18, and only the molding material 15 is integrally connected to the projecting portion on the opposite side of the coil winding 12 in a block shape. The molding material 15 is opposite to the coil winding 12. The housing portion is integrated with the side protrusion.

  According to the fifth embodiment described above, the housing part 18 integrated with the winding coil 12 is formed without using the cooling channel 14 applied in the first to fourth embodiments. There is an effect that manufacturing of the fixed cores 3 and 4 becomes easy and cost reduction is possible. Further, the heat generated by the winding coil 12 can be directly transmitted to the housing portion 18 (the heat conductive sheet member 17 and the molding material 15) integral with the winding coil 12, and the transmitted heat is transmitted to the cooling passage 16. Since the heat exchange is performed with the cooling medium flowing through the winding coil 12, the cooling efficiency of the winding coil 12 is not impaired even though the housing portion 18 is provided only on the one-side protruding portion of the winding coil 12. There is an effect that destruction can be prevented. Furthermore, since the peripheral end face of the heat conductive sheet member 17 is exposed on the peripheral end face of the molding material 15, the heat generation of the winding coil 12 can be efficiently radiated by the heat conductive sheet member 17. Therefore, the cooling efficiency of the winding coil 12 can be stably improved.

Embodiment 6 FIG.
In the fifth embodiment, the housing portion 18 having the cooling passage 16 formed of the multi-layered heat conductive sheet member 17 and the molding material 15 is provided only at one end portion of the coil winding 12. The housing portion 18 may be provided at both end portions of the coil winding 12. In this case, there is an effect that the cooling efficiency of the winding coil 12 can be further improved.

Embodiment 7 FIG.
6 is a perspective view showing a fixed core of an electromagnetic actuator according to Embodiment 7 of the present invention. The same parts as those in FIG.
In the seventh embodiment, in the fixed cores 3 and 4 of the electromagnetic actuator 1 according to the second embodiment, the laminated core 10, the coil winding 12, and the cooling channel 14, which are constituent elements thereof, are integrally coupled by the molding material 15. It has been made.

  According to the seventh embodiment in which the fixed cores 3 and 4 are configured as described above, the same effects as those of the second embodiment can be obtained, and the laminated core 10 and the coil winding 12 are securely and firmly coupled to each other. Since each of the fixed cores 3 and 4 is integrated, the electromagnetic actuator 1 to which the fixed cores 3 and 4 are assembled can be easily disassembled and assembled.

Embodiment 8 FIG.
FIG. 7 is a sectional view partially showing a fixed core of an electromagnetic actuator according to Embodiment 8 of the present invention. The same parts as those in FIGS.
In the eighth embodiment, at least one side end portion of the upper fixed core 3 and the lower fixed core 4 is integrally coupled with the cooling channel 20 straddling both of them by the molding material 15 (not shown in FIG. 7), and the cooling thereof. The channel 20 is provided with a cooling passage 21 extending from the upper fixed core 3 side to the lower fixed core 4 side. From the upper portion of the upper fixed core 3 side where the holding electromagnetic force is large with respect to the cooling passage 21 to the lower portion of the lower fixed core 4 side. The cooling medium is made to flow from the engine cooling system.

  According to the configuration of the eighth embodiment described above, the cooling medium from the engine cooling system is first flowed from the upper part on the upper fixed core 3 side where the holding electromagnetic force is large to the cooling passage 21, so that the upper fixed core that generates a large amount of heat is generated. 3 can be effectively cooled, and the cooling efficiency is improved.

Embodiment 9 FIG.
The ninth embodiment will be described with reference to FIG.
In the seventh embodiment, an oil sump portion 22 is provided on the lower side of the lower fixed core 4. Thus, by providing the oil sump portion 22 below the lower fixed core 4, the temperature environment of the engine room and the temperature environment of the electromagnetic actuator 1 can be separated, and the temperature rise of the coil winding 12 is suppressed. There is an effect that can be.

Embodiment 10 FIG.
In the first to seventh embodiments, the case where the cooling channels 14 are individually provided in the upper fixed core 3 and the lower fixed core 4 has been described. However, the cooling channels 14 include the upper fixed core 3 and the lower fixed core 3. The fixed core 4 may be integrally coupled with the molding material 15 across the end portions of the coil windings 12 of the fixed core 4. In this case, one cooling channel 14 can be a common cooling channel for the upper fixed core 3 and the lower fixed core 4, which reduces the number of parts, facilitates manufacturing, and reduces costs. The electromagnetic actuator 1 can be easily assembled by integrating the upper fixed core 3 and the lower fixed core 4 together, and there is an effect that the assembly / disassembly is facilitated.

Embodiment 11 FIG.
In the first embodiment to the seventh embodiment, the case where the cooling channels 14 are individually provided in the upper fixed core 3 and the lower fixed core 4 has been described. A structure similar to that of the cooling channel 20 in FIG. 7) can be employed, and the same effects as in this case and the eighth embodiment can be obtained.

It is sectional drawing which shows the electromagnetic actuator by Embodiment 1 of this invention. It is an expansion perspective view which shows the upper fixed core in FIG. It is a perspective view which shows the fixed core of the electromagnetic actuator by Embodiment 2 of this invention. It is a perspective view which shows the fixed core of the electromagnetic actuator by Embodiment 4 of this invention. It is a perspective view which shows the fixed core of the electromagnetic actuator by Embodiment 5 of this invention. It is a perspective view which shows the fixed core of the electromagnetic actuator by Embodiment 7 of this invention. It is sectional drawing which shows partially the fixed core of the electromagnetic actuator by Embodiment 8 and Embodiment 9 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Electromagnetic actuator, 2 Solid yoke, 3, 4 Fixed core, 5 Movable iron core, 6 Movable shaft, 7 Valve, 8, 9 Spring, 10 Laminated core, 10a Center hole part, 11 Coil fitting recessed part, 12 Winding coil, 13 Housing part, 14 Cooling channel, 15 Mold material, 16 Cooling path, 17 Thermally conductive sheet member, 18 Housing part, 20 Cooling channel, 21 Cooling path, 22 Oil sump part.

Claims (7)

  A laminated core having a coil fitting concave portion integrally has a pair of fixed cores that are arranged vertically by fitting coil windings in the coil fitting concave portion, and a movable iron core that is arranged between these fixed cores. An electromagnetic actuator comprising a movable shaft having a biasing force for holding the movable iron core in a neutral position between the fixed cores and moving in the axial direction against the biasing force when the coil winding is energized. A cooling channel is fitted to a projecting portion on at least one end side of both end projecting portions of the winding coil projecting from both end faces of the winding coil, and the cooling channel and the winding coil are integrally coupled with a molding material to form the winding. An electromagnetic actuator characterized in that a housing part integrated with a coil is formed.   At both ends of the winding coil projecting from both end faces of the laminated core, a housing portion is formed by integrally coupling a cooling channel to the projecting portion on one end side with a molding material, and a mold is formed on the projecting portion on the other end side. 2. The electromagnetic actuator according to claim 1, wherein only the material is integrally coupled in a block shape.   3. The electromagnetic actuator according to claim 1, wherein the laminated core, the coil winding, and the cooling channel are integrally coupled with a molding material.   A laminated core having a coil fitting concave portion integrally has a pair of fixed cores that are arranged vertically by fitting coil windings in the coil fitting concave portion, and a movable iron core that is arranged between these fixed cores. An electromagnetic actuator comprising a movable shaft having a biasing force for holding the movable iron core in a neutral position between the fixed cores and moving in the axial direction against the biasing force when the coil winding is energized. A plurality of thermally conductive sheet members arranged in layers in the vertical direction at a predetermined interval are integrated with a molding material on at least one of the protruding portions on both ends of the winding coil projecting from both end faces of the winding coil. An electromagnetic actuator comprising a housing part integrated with the coil winding.   The electromagnetic actuator according to claim 1, wherein a cooling passage is provided in the housing portion.   6. The electromagnetic actuator according to claim 5, wherein the cooling passage is provided in a housing portion of the upper fixed core, and a cooling medium flows into the cooling passage from above.   The electromagnetic actuator according to claim 1, wherein an oil sump portion is provided below the lower fixed core.

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