JP2010096285A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve capable of restricting deterioration of magnetic efficiency without increasing costs. <P>SOLUTION: A metal part 31 is formed by connecting a core 45 and a yoke 46 to each other with an articulated section 63, and a synthetic resin is adhered to the periphery of the metal part 31 for fixation to integrally form a bobbin 81. The inside surface of the metal part 31 is cut by counter boring, and cuttable parts of the articulated section 63 are cut to form clearance parts 71 separating the core 45 and the yoke 46 from each other. Residual parts of the articulated section 63 are left to form connecting parts 72 for connecting the core 45 and the yoke 46 to each other, and the clearance parts 71 and the connecting parts 72 are formed each other in the circumferential direction. The articulated section 63 is reinforced by the synthetic resin of the peripheral part, and a distance between the core 45 and the yoke 46 and coaxiality thereof are maintained by the connecting parts 72. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic valve that controls, for example, hydraulic pressure.

  Conventionally, when a hydraulic pressure is controlled in a hydraulic circuit of an automatic transmission of an automobile, an electromagnetic valve 801 as shown in FIG. 3 has been used.

  A solenoid 812 is accommodated in the cover 811 of the electromagnetic valve 801, and a module 816 in which a core 813 and a yoke 814 are connected by a guide 815 is accommodated in the solenoid 812. A plunger 817 is accommodated in the module 816 and is configured to operate in response to energization of the solenoid 812.

  As described above, in the solenoid valve 801 in which the core 813 and the yoke 814 are connected by the guide 815, high dimensional accuracy is required to ensure the coaxiality of the core 813 and the yoke 814. The cost is high. In addition, since the coaxiality is determined by a combination of a plurality of components, there is a problem that hysteresis is inferior compared to the integrated structure.

  In order to solve these problems, as shown in FIG. 4, an electromagnetic valve 903 structure in which a core 901 and a yoke 902 are integrally formed has been devised.

  However, in such a solenoid valve 903, in order to ensure the strength of the connecting portion 911 between the core 901 and the yoke 902, the connecting portion 911 is formed thick, and is connected by a metal. As the installed portion increases, the magnetic efficiency deteriorates.

  For this reason, the magnetic connection of the magnetic circuit is performed by performing laser processing on the connecting portion 911 to provide a plurality of holes 921,..., Thereby incurring high costs.

  The present invention has been made in view of such conventional problems, and an object of the present invention is to provide an electromagnetic valve capable of suppressing a decrease in magnetic efficiency without incurring high costs.

  In order to solve the above problems, the electromagnetic valve according to claim 1 of the present invention is an electromagnetic valve including an integrally molded product in which a core and a yoke constituting a magnetic circuit are integrally formed. And a reinforcing structure in which a non-magnetic material such as a resin is closely fixed.

  That is, since the core and the yoke constituting the magnetic circuit are integrally formed, it is not necessary to manage the coaxiality. Further, the connecting portion between the core and the yoke is reinforced by a reinforcing structure in which a non-magnetic material such as a resin is closely fixed.

  For this reason, it is possible to reduce the thickness of the connecting portion while maintaining the rigidity of the integrally formed product.

  According to a second aspect of the present invention, the integral molded product is configured by performing an inner diameter process on an inner surface of the connecting portion in which the non-magnetic material is closely fixed to an outer peripheral portion.

  That is, by applying inner diameter processing such as countersinking on the inner surface of the continuous portion reinforced by tightly fixing the non-magnetic body to the outer peripheral portion, while maintaining the strength of the continuous portion, Thinning is achieved.

  Further, in the electromagnetic valve according to the third aspect, a gap portion separating the core and the yoke and a connecting portion connecting the core and the yoke by the inner diameter processing are alternately formed in the circumferential direction of the connecting portion.

  That is, a gap portion separating the core and the yoke and a connection connecting the core and the yoke by performing inner diameter processing on an inner surface of the connecting portion in which the non-magnetic material is closely fixed to an outer peripheral portion The portions can be alternately formed in the circumferential direction of the continuous portion.

  Thereby, by connecting the core and the yoke by the connecting portion, a dimensional change due to a heat shrinkage difference generated between the integrally molded product and the nonmagnetic material is prevented. On the other hand, the gap between the core and the yoke separates the magnetic circuit and prevents a decrease in magnetic efficiency.

  As described above, in the solenoid valve according to the first aspect of the present invention, since the non-magnetic material such as resin is firmly fixed to the connecting portion between the core and the yoke, the integral is provided. The continuous portion can be thinned while maintaining the rigidity of the formed product.

  For this reason, in order to secure the strength, the connecting portion is thickened, and in order to prevent deterioration of the magnetic efficiency accompanying the increase in thickness, the connecting portion is subjected to laser processing to form a hole. Compared with the conventional method, it is possible to suppress a decrease in magnetic efficiency without increasing the cost.

  Further, in the electromagnetic valve according to claim 2, the strength of the connecting portion is obtained by countersinking the inner surface of the connecting portion that is reinforced by the nonmagnetic material being closely fixed to the outer peripheral portion. While maintaining the above, it is possible to reduce the thickness.

  Furthermore, in the electromagnetic valve according to claim 3, by performing inner diameter processing on an inner surface of the connecting portion in which the nonmagnetic material is closely fixed to an outer peripheral portion, the gap portion separating the core and the yoke, The connection part which connected the core and the said yoke can be formed alternately in the circumferential direction of the said connection part.

  Thereby, by connecting the core and the yoke by the connecting portion, it is possible to prevent a dimensional change due to a heat shrinkage difference generated between the integrally molded product and the nonmagnetic material.

  On the other hand, since the magnetic circuit can be magnetically interrupted by the gap that separates the core and the yoke, a decrease in magnetic efficiency can be prevented.

  At this time, since the gap can be formed by inner diameter processing, the cost can be reduced as compared with the case of forming holes by laser processing.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an electromagnetic valve 1 according to the present embodiment, and the electromagnetic valve 1 controls hydraulic pressure by a hydraulic circuit in an automatic transmission of an automobile, for example.

  The electromagnetic valve 1 includes a cylindrical container-like cover 11, and an integrally molded product 12 is accommodated in the cover 11. The flange 14 of the nozzle 13 is in contact with the lower end of the integrally molded product 12 in the drawing, and the lower edge of the cover 11 is bent over the entire periphery of the periphery of the flange 14. Yes.

  Thereby, the nozzle 13 and the integrally molded product 12 are fixed by a caulking portion 21 formed by bending the lower edge of the cover 11, and the integrally molded product 12 and the flange portion 14 of the nozzle 13 are Is fixed in a state of being accommodated in the cover 11.

  As shown in the left side of FIG. 1, the integrally molded product 12 is formed by insert-molding a metal component 31 that is a magnetic material into a synthetic resin that is a non-magnetic material, and the metal component 31 is cylindrical. Is formed.

  As shown in FIG. 2, a side extending portion 41 extending sideways is formed integrally with the lower end portion of the metal part 31, and the side extending portion 41 is A constricted portion 42 that recedes in a V shape along the peripheral surface is formed at a portion above the lower end in the formed figure.

  Thus, the metal part 31 is integrally formed with the core 45 constituting the magnetic circuit on the lower side in the drawing with the constricted portion 42 as a boundary, and on the upper side in the drawing with the constricted portion 42 as a boundary. A yoke 46 that constitutes a magnetic circuit together with the core 45 is integrally formed.

  The yoke 46 has a middle thickness portion 51 continuous with the constricted portion 42 formed on the side of the constricted portion 42, and the upper side of the middle thickness portion 51 is thicker than the middle thickness portion 51. A thick portion 52 is formed.

  The constricted portion 42 has a downward tapered portion 61 that is inclined toward the central direction as it goes upward from the side extending portion 41, and toward the central side as it goes downward from the inner thickness portion 51 of the yoke 46. The upper tapered portion 62 is inclined, and the connecting portion 63 is provided between the upper tapered portion 62 and the lower tapered portion 61 and connects the core 45 and the yoke 46.

  The connecting portion 63 is formed in a thin cylindrical shape, and the metal part 31 is processed to have an inner diameter so that the core 45 and the yoke 46 are separated from each other. The connecting portions 72,... Connecting the yoke 46 are alternately formed in the circumferential direction of the connecting portion 63 (see the right side in FIG. 2). Further, on the outer peripheral surface of the connecting portion 63, ribs 73,... Connecting the upper taper portion 62 and the lower taper portion 61 in the axial direction are integrally formed with an interval (one). Each of the ribs 73, ... is formed in a thin plate shape protruding radially outward.

  The synthetic resin, which is a non-magnetic material, is tightly fixed to the outer peripheral surface of the metal part 31, and the bobbin is attached to the outer peripheral part of the metal part 31 by the synthetic resin as shown in FIG. 81 and a connector 82 are integrally formed.

  As shown in FIG. 2, the bobbin 81 includes a lower flange portion 91 formed in close contact with the laterally extending portion 41 of the metal part 31, and a body provided on the outer peripheral portion of the metal part 31. Part 92 and a ring-shaped upper collar part 93 extending from the upper end of the trunk part 92 to the side, and a winding is wound between the upper collar part 93 and the lower collar part 91. A solenoid can be formed by rotating and forming a coil.

  A part of the synthetic resin forming the bobbin 81 is also filled in the constricted portion 42 of the metal part 31 and is tightly fixed to the core 45, the yoke 46, and the connecting portion 63. Thereby, the reinforcement part 101 which reinforces the said connection part 63 is comprised.

  When forming the integrally molded product 12, as shown on the left side in FIG. 2, first, the core 45 and the yoke 46 are connected by the connecting portion 63, and the integrated metal part 31 is integrated. Form.

  Then, as shown in the center of FIG. 2, the metal part 31 is insert-molded, so that the synthetic resin is closely fixed to the outer peripheral part of the metal part 31 to integrally form the bobbin 81.

  At this time, the core 45 and the yoke 46 are connected by the connecting portion 63 extending over the entire circumference. For this reason, it is possible to prevent the synthetic resin from entering the metal part 31 during insert molding, and it is possible to prevent the connecting portion 63 from being deformed by the resin pressure.

  Next, as shown on the right side in FIG. 2, the inner surface of the metal part 31 in which the bobbin 81 formed of a synthetic resin which is a non-magnetic material is closely fixed to the outer peripheral portion is subjected to inner diameter processing, The inner surface of the metal part 31 is cut by countersinking.

  Here, the continuous portion 63 of the metal part 31 includes a thin-walled cutable portion scraped off by the countersinking process and a remaining part slightly thicker than the cuttable part remaining after the countersinking process. These are alternately formed in the circumferential direction in advance (not shown).

  At this time, the continuous portion 63 formed thin is reinforced from the outside by a synthetic resin made in close contact with the outer peripheral portion and solidified. For this reason, the cutting from the inside can be performed without any trouble.

  Then, when the countersinking is performed on the connecting portion 63 of the metal part 31, the cuttable portion is scraped off, and the horizontally elongated rectangular gap portion that separates the core 45 and the yoke 46 from each other. 71, ... are formed. Here, the gaps 71,... Are filled with a synthetic resin that forms the bobbin 81. Further, since the remaining portion remains, the vertically long rectangular connecting portions 72,... For connecting the core 45 and the yoke 46 are formed by the remaining portion, and the connecting portion 63 includes the gaps. .. And the connecting portions 72,... Are alternately formed in the circumferential direction.

  At this time, the outer peripheral portion of the connecting portion 63 is reinforced by the reinforcing portion 101 made of the synthetic resin, and the core 45 and the yoke 46 are formed of the thin connecting portions 72,. The ribs 73,..., In which the upper taper portion 62 and the lower taper portion 61 are continuously provided in the axial direction, maintain the coaxiality and maintain a separation interval. Further, the continuous portion 63 further thinned by the countersinking process is reinforced by a part of the bobbin 81 made of synthetic resin that is closely fixed to the outer peripheral portion of the continuous portion 63.

  In the present embodiment having the above-described configuration, the core 45 and the yoke 46 constituting the magnetic circuit are integrally formed, so that it is not necessary to manage the coaxiality. This eliminates the need for high dimensional management for ensuring the coaxiality of the core and the yoke, as compared with the conventional case where the core and the yoke must be connected by a guide, thereby reducing the cost.

  In addition, the hysteresis can be improved by the integrated structure as compared with the conventional structure in which the coaxiality is determined by a combination of a plurality of parts such as the core, the yoke, and the guide.

  A synthetic resin, which is a non-magnetic material, is tightly fixed to the connecting portion 63 in which the core 45 and the yoke 46 are connected, and is reinforced by this reinforcing structure.

  For this reason, it is possible to reduce the thickness of the connecting portion 63 while maintaining the rigidity of the metal part 31 constituting the integrally formed product 12.

  As a result, the connecting portion is thickened to ensure strength, while in order to prevent deterioration in magnetic efficiency associated with the thickening, the connecting portion must be laser processed to form a hole. It is possible to suppress a decrease in magnetic efficiency without incurring an increase in cost as compared with the conventional case that has not been achieved.

  Therefore, it is possible to provide the solenoid valve 1 that can suppress a decrease in magnetic efficiency without incurring high costs.

  Further, the inner surface of the connecting portion 63 reinforced with a synthetic resin that is a non-magnetic material is closely fixed to the outer peripheral portion is countersunk, so that the strength of the connecting portion 63 can be maintained while the magnetic body is used. A certain metal part can be thinned.

  Then, by applying inner diameter processing to the inner surface of the connecting portion 63 in which a synthetic resin as a non-magnetic material is closely fixed to the outer peripheral portion, the gap portion 71 that separates the core 45 and the yoke 46. And the connecting portions 72,... Connecting the core 45 and the yoke 46 can be alternately formed in the circumferential direction of the connecting portion 63.

  As a result, the core 45 and the yoke 46 are connected by the connecting portions 72,... And the ribs 73, so that the metal part 31 made of metal and the bobbin made of synthetic resin are connected. Thus, a change in the distance between the core 45 and the yoke 46 due to a difference in thermal shrinkage between the core 45 and the yoke 46 can be prevented.

  On the other hand, since each of the gap portions 71,... Separating the core 45 and the yoke 46 can perform magnetic shielding in the magnetic circuit, it is possible to prevent a decrease in magnetic efficiency.

  At this time, since the gap portions 71,... Can be formed by the inner diameter processing, the cost can be reduced as compared with the case of forming holes by laser processing.

  In the present embodiment, the case where the metal part 31 is countersunk and the connecting portion 63 is further thinned has been described as an example. However, the present invention is not limited to this. Even if the connecting portion 63 is thinned when the constricted portion 42 is formed in the metal part 31, the above-described effects can be sufficiently obtained.

  In the present embodiment, the metal part 31 is countersunk, so that the connecting portion 63 is separated from the gap portions 71,... Separated from the core 45 and the yoke 46, and the core 45 and Although the said connection part 72 ... which connected the said yoke 46 was formed alternately in the circumferential direction, and it demonstrated and demonstrated the example which prevents the fall of magnetic efficiency, it is not limited to this, The said connection A decrease in magnetic efficiency can be prevented only by thinning the portion 72.

It is explanatory drawing which shows one embodiment of this invention. It is explanatory drawing which shows a mode that the integrally molded product of the embodiment is formed. It is a figure which shows the conventional solenoid valve. It is a figure which shows another prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 12 Integrated molding 45 Core 46 Yoke 63 Connection part 71 Gap part 72 Connection part 81 Bobbin 101 Reinforcement part

Claims (3)

In a solenoid valve provided with an integrally molded product in which a core and a yoke constituting a magnetic circuit are integrally formed,
An electromagnetic valve comprising a reinforcing structure in which a non-magnetic material such as a resin is tightly fixed to a connecting portion between the core and the yoke.   2. The solenoid valve according to claim 1, wherein the integrally molded product is formed by subjecting an inner surface of the connecting portion in which the nonmagnetic material is closely fixed to an outer peripheral portion to inner diameter processing.   3. The electromagnetic wave according to claim 2, wherein a gap portion that separates the core and the yoke and a connecting portion that connects the core and the yoke are alternately formed in a circumferential direction of the connecting portion by the inner diameter processing. valve.

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