JP2008099531A - Coil-retaining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil-retaining structure that will not be affected by vibration, without increasing manufacturing processes. <P>SOLUTION: In the coil-retaining structure 1 retains a coil 10 for generating magnetic flux by allowing current to flow inside a housing 20, inside the housing 20, a yoke 30 is integrally formed, where the yoke 30 can store the coil 10 inside is made of metal, and is formed substantially into a bottomed tubular shape. The coil 10 is stored in the yoke 30. In the yoke 30, there is a lid member 37 for blocking the open edge 35 and the lid member 37 is pressed into the open edge 35; and as a result, the coil 10 is pressed by the yoke 30 and the lid member 37 for fixing, and is stored inside the yoke 30 and the lid member 37. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coil holding structure that holds a coil that generates magnetic flux by passing an electric current in a housing.

Conventionally, there has been a structure for holding a coil in a housing as shown in Patent Document 1, for example. As shown in FIG. 10, the coil holding structure is configured such that the coil 101 is integrated with the yoke 102 to form the coil assembly 103 and then inserted into the housing 104 and accommodated. A mounting seat 106 with which the coil 101 abuts is formed at the bottom of the housing hole 105 of the housing 104, and the coil 101 is fixed to the mounting seat 106. A predetermined gap is formed between the outer peripheral surface of the yoke 102 and the inner peripheral surface of the housing 104.
Japanese Patent Laid-Open No. 2001-225731 (FIG. 2)

  However, in the conventional coil holding structure, since a gap is formed between the yoke 102 and the housing 104, when the vibration from the outside is received, the fixing strength between the yoke 102 and the housing 104 is low, and the influence of the vibration is reduced. There was a problem that it was easy to receive. In particular, when the coil is attached in the immediate vicinity of the engine, such as a slave cylinder of an automobile clutch, the influence of vibration is significant. Therefore, it is conceivable to fill the gap by secondary processing such as secondary molding or potting. However, this increases the number of processes, which complicates management and increases the production time.

  From such a viewpoint, an object of the present invention is to provide a coil holding structure that is not affected by vibration without increasing the number of manufacturing steps.

  The present invention that solves such a problem is a coil holding structure that holds a coil that generates magnetic flux by passing an electric current inside the housing. The coil can be accommodated inside the housing and is substantially made of metal. The coil holding structure is characterized in that a yoke formed in a bottomed cylindrical shape is integrally formed and the coil is accommodated in the yoke.

  According to the coil holding structure having the above-described configuration, it is possible to eliminate the gap between the housing and the yoke using only necessary members without requiring secondary processing such as secondary molding or potting. Therefore, the manufacturing process is not increased, the coil and the yoke are not vibrated relative to the housing due to external vibration, and the vibration resistance is improved and is not affected by the vibration. Furthermore, the yoke can also function as a reinforcing member for the housing, the housing can be thinned, and the weight can be reduced.

  In the present invention, the yoke is further provided with a lid member that closes the opening end portion thereof, and the lid member is press-fitted into the opening end portion of the yoke, whereby the coil is connected to the yoke and the lid member. It is good to comprise so that it may press and fix, and it may accommodate in the inside of the said yoke and the said cover member. In this case, since the housing, the yoke and the coil are integrated by a simple fixing method, the fixing strength between the coil and the yoke is increased, and the vibration resistance is further improved.

  In addition, according to the present invention, a buffer member may be interposed between the coil and the inside of the bottom surface of the yoke. In this way, vibration can be absorbed by the buffer member, and vibration resistance is further improved. This effect can be obtained even when the convex portion provided on the bobbin (see claim 4) contracts due to a thermal load in a high temperature environment and the reaction force between the coil and the yoke due to the compression of the convex portion decreases.

  Further, according to the present invention, the bobbin of the coil may be configured to have a convex portion that is pressed to the inside of the bottom surface of the yoke and compressed in the axial direction of the coil. In addition, the bottom face of the yoke in the present invention refers to a bottom portion formed in a substantially bottomed cylindrical shape, and is the back side into which the coil is inserted. If it does in this way, the combination tolerance of the axial direction of a yoke, a lid member, and a bobbin can be absorbed.

  Further, according to the present invention, the bobbin of the coil is integrally formed with an elastic portion which is made of a member different from the bobbin and is pressed in the bottom surface of the yoke and compressed in the axial direction of the coil. What is necessary is just to comprise. The elastic part is made of a resin having elasticity larger than that of the bobbin main body, for example, an elastomer resin, and is integrally formed by molding integrally with the bobbin. If it does in this way, since a coil is pressed by the yoke and a lid member by press-fitting of a lid member, the fixed strength of a coil and a yoke will increase, and vibration resistance will improve further. Furthermore, the number of assembly members can be reduced and the assembly work can be simplified.

  The coil holding structure according to the present invention exhibits an excellent effect of preventing the influence of vibration without increasing the manufacturing process.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. In the present embodiment, the yoke is opened downward with reference to the state where the housing is attached to the base body from above.

  As shown in FIG. 1, the coil holding structure 1 according to the present embodiment is a structure that holds a coil 10 that generates magnetic flux by passing an electric current inside a housing 20. The tip end side of the valve component 50 is inserted into the bobbin 12 around which the conducting wire 11 of the coil 10 is wound. The valve component 50 is assembled in a mounting hole 62 formed in a base body 60 that contains a fluid flow path 61 such as a brake fluid. In the present embodiment, the valve component 50 is constituted by a normally open solenoid valve. In a normal state, the flow path 61 is open, and when a magnetic flux is generated in the coil 10, the movable core moves and the valve is moved. Is closed so that the flow path 61 is closed. In FIG. 1, reference numeral 64 denotes an O-ring that is interposed between the base body 60 and the housing 20 and seals between the inside and the outside of the housing 20.

  By the way, the coil holding structure 1 includes a yoke that can accommodate the coil 10 in the housing 20 and is formed in a substantially bottomed cylindrical shape with a magnetic member harder than the housing 20, for example, a metal such as iron. 30 is integrally formed, and the coil 10 is integrally accommodated in the yoke 30.

  As shown in FIGS. 1 and 3, the housing 20 is made of resin and has a mounting hole 21 that opens downward (toward the base body 60). The mounting hole 21 has a circular cross section on the inner peripheral surface and is formed in the same shape as the outer peripheral surface of the yoke 30, and the yoke 30 is configured to be in close contact with the inner peripheral surface of the mounting hole 21. . The yoke 30 is integrally attached when the housing 20 is injection molded. Specifically, the yoke 30 is put on the lower mold, the upper mold is arranged at a predetermined interval from above, and the housing 20 is molded by injecting resin between the upper mold and the yoke 30. Yes. As a result, the housing 20 and the yoke 30 are integrally formed.

  On the upper side of the center portion of the mounting hole 21, a valve accommodation hole 9 that accommodates the distal end portion of the valve component 50 is formed. A pair of terminal pieces 13 (see FIGS. 5 and 6, only one of which is shown in FIG. 1) connected to both ends of the conducting wire 11 of the coil 10 on the side of the valve housing hole 9 and above the mounting hole 21, A connection hole 23 for connecting a pair of lead wires 22 (see FIG. 1, only one of them) by welding or soldering is formed. On the upper side of the connection hole 23, a gripping hole 25 that fits a grommet 24 (see FIG. 1) that surrounds and grips the lead wire 22 from the outer periphery communicates with the connection hole 23 and opens upward. Is formed. The grommet 24 is formed in a cylindrical shape with an elastic member such as rubber, and the lead wire 22 is inserted and held therein. On the outer peripheral surface of the grommet 24, a plurality of annular seal protrusions 24a that are in close contact with the inner peripheral surface of the gripping hole 25 are formed.

  A bending hole 26 for bending the lead wire 22 is formed on the side of the gripping hole 25 so as to open upward. A cover member 27 (see FIG. 1) that covers the gripping hole 25 and the bending hole 26 is provided on the upper portion of the housing 20. The cover member 27 is formed with a holding plate 28 that pushes the lead wire 22 downward in the bending hole 26 and extends downward. The holding plate 28 holds the lead wire 22 downward in the bending hole 26 and bends it in a V shape. Even if an upward tensile force is generated on the lead wire 22, the lead wire 22 and the terminal It is possible to prevent stress from being applied to the connecting portion with the piece 13.

  As shown in FIG. 2, bolt holes 29 through which bolts 63 for attaching the housing 20 to the base body 60 are inserted are formed on both sides of the attachment hole 21 of the housing 20.

  As shown in FIGS. 3 and 4, the yoke 30 is formed in a bottomed cylindrical shape with a magnetic member harder than the housing 20, for example, a metal such as iron, and the housing 20 is open downward. It is housed in one piece. The bottom surface 31 of the yoke 30 has a valve insertion hole 32 through which the tip of the valve component 50 is inserted, a terminal piece insertion hole 33 through which the terminal piece 13 of the coil 10 is inserted, and a housing inflow for preventing the yoke 30 from rotating. A hole 34 is formed.

  The valve insertion hole 32 is formed in a circular shape at the center position of the bottom surface 31. The terminal piece insertion hole 33 is formed at a position corresponding to the connection hole 23 of the housing 20. A plurality of housing inflow holes 34 are formed concentrically. The resin flows into the housing inflow hole 34 when the housing 20 is injection molded. The resin flows below the housing inflow hole 34 and hardens so as to cover the housing inflow hole 34 (indicated by a one-dot chain line in FIG. 4). As a result, the resin of the housing 20 is locked to the inner peripheral surface of the housing inflow hole 34 and the lower surface thereof. Therefore, the integrity of the housing 20 and the yoke 30 can be enhanced, and the rotation and dropping of the yoke 30 can be prevented.

  As shown in FIGS. 1 and 3, the yoke 30 is configured such that the opening end portion 35 protrudes a predetermined length from the lower surface of the housing 20. The open end 35 has a step 35a (see FIG. 3) on the inner peripheral surface so that the outer diameter is the same as or larger than the other cylindrical portion on the bottom surface 31 side and the inner diameter is larger than the other cylindrical portion. ), And the thickness of the opening end portion 35 is thinner than the other cylindrical portions.

  As shown in FIGS. 5 to 7, the coil 10 includes a conducting wire 11 (see FIG. 5) and a bobbin 12 around which the conducting wire 11 is wound. The bobbin 12 includes a first flange portion 12a, a winding core portion 12b, and a second flange portion 12c. The bobbin 12 is made of resin.

  The first collar portion 12a is a collar portion located on the upper side (the bottom surface 31 side of the yoke 30). On the upper surface of the first flange portion 12a, a support portion 14 for standingly supporting the terminal piece 13 is formed. Further, a circular ridge 15 centering on the core of the coil 10 is formed on the upper surface of the first flange 12a. A groove 16 concentric with the protrusion 15 is formed in the protrusion 15. The groove 16 is formed in an annular shape, and an O-ring that is a buffer member 36 described later is attached to the groove 16. On the inner part of the groove 16 of the ridge 15, a plurality of convex portions 17 projecting upward are arranged concentrically at a predetermined angular pitch (60 ° pitch in the present embodiment) (six locations in the present embodiment). Yes. The convex portion 17 is configured to be pressed toward the inside of the bottom surface 31 of the yoke 30 and compressed in the axial direction of the coil 10 when the coil 10 is mounted on the yoke 30.

  The 2nd collar part 12c is a collar part located in the lower side (opening edge part side of the yoke 30). As shown in FIG. 7, a projecting portion 18 having a cross-sectional arc shape is formed on the lower surface of the second flange portion 12c. The protruding portion 18 has a cross-sectional shape in which both ends of a part of the arc of the outer peripheral circle of the second flange portion 12c are connected by a straight line. A recess 18 a is formed on the lower surface of the protruding portion 18, thereby reducing the weight of the bobbin 12.

  The winding core portion 12b has a cylindrical shape, and a valve insertion hole 19 into which the valve component 50 (see FIG. 1) is inserted is configured.

  As shown in FIG. 1, a buffer member 36 is interposed between the coil 10 and the inside of the bottom surface of the yoke 30. The buffer member 36 is constituted by, for example, a rubber O-ring, and is mounted in the groove portion 16 formed in the protrusion 15 of the bobbin 12. By pressing and accommodating the coil 10 on the bottom surface 31 of the yoke 30, the buffer member 36 is interposed between the coil 10 and the yoke 30 in a compressed state.

  As shown in FIGS. 1 and 2, the yoke 30 is further provided with a lid member 37 that closes the opening end 35 thereof. The lid member 37 is formed in a substantially disk shape, and is configured to contact the lower surface of the second flange portion 12 c of the bobbin 12 of the coil 10. The lid member 37 has a planar shape equivalent to the flat portion 18b excluding the protruding portion 18 of the second flange portion 12c. That is, the lid member 37 has an outer diameter larger than that of the second flange portion 12c, a part (a portion corresponding to the protruding portion 18) is cut out, and a through hole 37a through which the valve component 50 passes through the center portion. It has a planar shape with

  The lid member 37 is fixed to the yoke 30 by being press-fitted into the open end portion 35 of the yoke 30, and the open end portion 35 is caulked to secure the lid member 37. The lid member 37 is, for example, three caulking fixing portions 35b (see FIG. 2) arranged at a pitch of 120 degrees in the circumferential direction on a portion (see FIG. 1) located below the lid member 37 of the opening end portion 35. And it is fixed by caulking. At this time, the open end 35 of the yoke 30 protrudes from the lower surface of the housing 20 by a predetermined length, so that it is easy to perform caulking.

  Here, since the upper portion of the coil 10 is fixed to the bottom surface 31 of the yoke 30 in a state where the convex portion 17 and the buffer member 36 are compressed, if the lid member 37 is fixed by caulking at the lower portion of the coil 10, the convex portion The second flange 12c of the coil 10 is biased toward the lid member 37 by the restoring force of the portion 17 and the buffer member 36, and the coil 10, the yoke 30, and the lid member 37 are fixed.

  According to the coil holding structure 1 described above, as shown in FIG. 1, a yoke 30 that can accommodate the coil 10 and is formed of a metal in a substantially bottomed cylindrical shape is integrally formed in the housing 20. By housing the coil 10 in the yoke 30, the housing 20, the yoke 30, and the coil 10 can be fixed integrally. As a result, it is possible to eliminate the gap between the housing 20 and the yoke 30 with only necessary members without requiring secondary processing such as secondary molding or potting. Therefore, the manufacturing process of secondary processing does not increase, the coil 10 and the yoke 30 do not vibrate relative to the housing 20 due to external vibration, and the vibration resistance is improved and the influence of vibration is reduced. I do not receive it. In particular, when potting or the like is performed, many processes such as filling, defoaming, and drying are required, and the coil holding structure 1 cannot be moved during the process. Since it can be omitted, the effect of omitting the secondary processing is great. Furthermore, since the housing 20 is formed of resin, it can be easily formed integrally with the yoke 30 by injection molding. In particular, by molding the yoke 30 on the lower mold, injection molding can be performed without the yoke 30 being deformed.

  In particular, according to the present embodiment, as shown in FIGS. 1 and 2, the yoke 30 is further provided with a lid member 37 that closes the opening end portion 35, and the lid member 37 is an opening end portion of the yoke 30. Since the open end 35 is caulked after being press-fitted into the yoke 35, the housing 20, the yoke 30 and the coil 10 can be integrated by a simple fixing method.

  At this time, since the opening end portion 35 of the yoke 30 is formed thinner than the other cylindrical portion on the bottom surface 31 side, it is easy to perform caulking. Further, as shown in FIG. 2, the lid member 37 is configured such that a part thereof is notched and is engaged with the protruding portion 18 of the second flange portion 12 c of the coil 10, so that the coil 10 rotates. Can be prevented. According to this, since the rotational movement of the terminal piece 13 connected to the lead wire 22 can be prevented, unnecessary stress is not applied to the connecting portion, and the lead wire 22 and the terminal piece 13 come off. There is nothing. Further, the opening end portion 35 of the yoke 30 has a step portion 35 a formed with a thickness thinner than that of the other cylindrical portion on the bottom surface 31 side, so that the coil 10 and the lid member 37 are formed in the opening end portion 35. It is easy to insert and has a function of a guide, and also has a function as a stopper for preventing the coil 10 and the bobbin 12 from being damaged during press-fitting and caulking of the lid member 37.

  Furthermore, according to the embodiment, the yoke 30 is formed of a magnetic member that is harder than the resin housing 20, for example, iron. Therefore, by integrating the yoke 30 with the housing 20, It can also function as a reinforcing member. As a result, the housing 20 can be made thinner and lighter.

  Further, since an O-ring which is a buffer member 36 is interposed between the coil 10 and the inside of the bottom surface 31 of the yoke 30, vibration can be absorbed by the buffer member 36 and vibration resistance is further improved. To do. Further, the fixing of the coil 30, particularly the axial direction, is ensured by fixing the yoke 30 and the lid member 37 by caulking and by interposing the O-ring as the buffer member 36.

  Further, since the convex portion 17 is formed on the bobbin 12 of the coil 10 so as to be pressed inside the bottom surface 31 of the yoke 30 and compressed in the axial direction of the coil 10, the pressing force against the bottom surface 31 of the yoke 30 of the coil 10 is formed. Can be generated. In particular, since a plurality of convex portions 17 are formed along the circumferential direction, the pressing force can be dispersed and generated in a well-balanced manner, and rattling can be eliminated and vibration of the coil 10 can be prevented.

  FIG. 8 is a sectional view showing another embodiment of the coil, and FIG. 9 is a plan view showing another embodiment of the coil. In the coil 10 shown in FIGS. 8 and 9, an elastic portion 38 is formed instead of the convex portion 17 (see FIGS. 5 and 6) and the buffer member 36 (see FIG. 1). The elastic portion 38 is a member that is pressed to the inside of the bottom surface 31 of the yoke 30 and is compressed in the axial direction of the coil 10, and is made of a member different from the bobbin 12. The elastic portion 38 is disposed in the groove portion 16 formed in the protrusion 15 of the bobbin 12. The elastic portion 38 is made of a resin having elasticity larger than that of the bobbin 12 body, for example, an elastomer resin, and is integrally formed with the bobbin 12 by being molded integrally with the bobbin 12. Since other configurations are the same as those of the coil 10 shown in FIGS. 5 and 6, the same reference numerals are given and description thereof is omitted.

  According to such a configuration, the elastic portion 38 can absorb vibration, and the coil 10 is pressed against the yoke 30 and the lid member 37 by the press-fitting of the lid member 37, so that the fixing strength of the coil 10 and the yoke 30 is increased. The vibration resistance is further improved. Furthermore, as compared with the coil 10 shown in FIGS. 5 to 7, the number of assembly members can be reduced and the assembly work can be simplified.

  The coil holding structure 1 is not limited to the above-described embodiment, and may be appropriately changed in design without departing from the spirit of the present invention.

It is sectional drawing which shows the coil holding structure which concerns on embodiment of this invention. It is a bottom view which shows the coil holding structure which concerns on embodiment of this invention. It is sectional drawing which shows a housing and a yoke. It is a bottom view which shows a housing and a yoke. It is sectional drawing which shows a coil. It is a top view which shows a coil. It is a bottom view which shows a coil. It is sectional drawing which shows the other form of a coil. It is a top view which shows the other form of a coil. It is sectional drawing which shows the conventional coil holding structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil holding structure 10 Coil 12 Bobbin 17 Convex part 20 Housing 30 Yoke 31 Bottom face 35 Open end part 36 Buffer member 37 Cover member 38 Elastic part

Claims (5)

In the coil holding structure that holds the coil that generates magnetic flux by passing an electric current inside the housing,
In the housing, a yoke that can accommodate the coil and is formed in a substantially bottomed cylindrical shape with metal is integrally formed,
A coil holding structure in which the coil is accommodated in the yoke. The yoke is further provided with a lid member that closes the opening end thereof,
The coil is pressed and fixed between the yoke and the lid member by press-fitting the lid member into the open end of the yoke, and is housed inside the yoke and the lid member. The coil holding structure according to claim 1.   3. The coil holding structure according to claim 1, wherein a buffer member is interposed between the coil and the inside of the bottom surface of the yoke.   4. The protrusion according to claim 1, wherein the bobbin of the coil is formed with a convex portion that is pressed inside the bottom surface of the yoke and is compressed in the axial direction of the coil. 5. The coil holding structure as described.   2. The coil bobbin is integrally formed with an elastic portion made of a member different from the bobbin and pressed in the bottom surface of the yoke and compressed in the axial direction of the coil. Or the coil holding structure of Claim 2.

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