JP2018049857A - Coil assembly and brake control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate a coil assembly 13 without needing press fitting between metal components.SOLUTION: A coil assembly 13 comprises: a coil bobbin 42 around which a coil is wound; a first cylindrical yoke 43 in which one end housing the coil bobbin 42 is opened; and a second yoke 44 disposed along an opening end of the first yoke 43. The first yoke 43 has a first cylindrical standing wall 54 at an opening edge of a through hole 53. The second yoke 44 has a second cylindrical standing wall 64 at an opening edge of a through hole 63. Three projection parts 49 are continuously formed over an entire length of an inner periphery of a shaft through hole 46 of the coil bobbin 42. The first standing wall 54 and the second standing wall 64 are press-fitted in the inner periphery of the shaft through hole 46, and the first yoke 43 and the second yoke 44 are coupled to the coil bobbin 42.SELECTED DRAWING: Figure 14

Description

  The present invention relates to a coil assembly including a coil bobbin and a yoke, and a brake control device including the coil assembly.

  Patent Document 1 discloses a solenoid in which a bobbin formed by winding a coil is accommodated in a cylindrical yoke. The yoke is composed of a cup-shaped yoke case having an open end, and a yoke top having an annular plate shape that closes the open end of the yoke case. Is press-fitted.

JP 2014-149068 A

  In the above configuration, since the yoke is configured as a metal can by press-fitting the yoke top into the yoke case, and the bobbin is held therein, the press-in process for configuring the metal can becomes complicated.

  According to the present invention, a cylindrical yoke or first yoke having an open end and a coil bobbin accommodated in the yoke or first yoke are coupled together to be integrated as a coil assembly. It is.

  According to this invention, the press-fitting process for forming a metal can as in the prior art is not required, and assembly is facilitated.

1 is a schematic cross-sectional view of a brake control device in which a coil assembly according to the present invention is used. The disassembled perspective view of the brake control device. The bottom view which showed the structure by the side of the bottom face of a body. The perspective view which similarly showed the structure of the bottom face side of a body. The expanded sectional view of the A section of FIG. The perspective view which showed the structure of the upper surface side of a body in the state which removed the circuit board. The enlarged view of the X section of FIG. The perspective view which showed the structure of the upper surface side of a body in the state before attaching a coil assembly. The enlarged view of the Y section of FIG. The perspective view which shows the coil assembly of 1st Example. The front view of the coil assembly. The bottom view of the coil assembly. The top view of the coil assembly. Sectional drawing of the coil assembly. The perspective view which shows the coil bobbin of 1st Example alone. The front view of the coil bobbin. The top view of the coil bobbin. The perspective view which shows the 1st yoke of 1st Example alone. The perspective view which shows the 2nd yoke of 1st Example alone. The front view of the 2nd yoke. The bottom view of the 2nd yoke. Sectional drawing of the coil assembly of 2nd Example. The enlarged view of the B section in FIG. The enlarged view of the C section in FIG. Sectional drawing of the coil assembly of 3rd Example. The enlarged view of the D section in FIG. The enlarged view of the E section in FIG. Sectional drawing of the coil assembly of 4th Example. The enlarged view of the F section in FIG. The perspective view of the coil bobbin in 4th Example. Sectional drawing of the coil assembly of 5th Example. The enlarged view of the G section in FIG. The perspective view of the coil bobbin in 5th Example. The perspective view of the coil assembly of 6th Example. The front view of the coil assembly. The top view of the coil assembly. The bottom view of the coil assembly. Sectional drawing of the coil assembly. The enlarged view of the H section in FIG. Enlarged view of part J in FIG. The perspective view of the coil bobbin in 6th Example. The perspective view which showed the same coil bobbin from the opposite direction. The perspective view of the 1st yoke in 6th Example. The perspective view of the 2nd yoke in 6th Example. The perspective view of the coil assembly of 7th Example. Sectional drawing of the coil assembly. The top view of the coil assembly. The perspective view of the coil bobbin in 7th Example. The top view of the yoke in 7th Example. The perspective view of the yoke. Sectional drawing of the coil assembly of 8th Example. The enlarged view of the K section in FIG. The enlarged view of the L section in FIG. Sectional drawing of the coil assembly of 9th Example. The enlarged view of the M section in FIG. The enlarged view of the N section in FIG. Sectional drawing of the coil assembly of 10th Example. The enlarged view of the P section in FIG. The perspective view of the coil bobbin in 10th Example. Sectional drawing of the coil assembly of 11th Example. The enlarged view of the Q section in FIG. The perspective view of the coil bobbin in 11th Example. The perspective view of the coil assembly of 12th Example. Sectional drawing of the coil assembly. The enlarged view of the R section in FIG.

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

[Configuration of entire brake control unit]
FIG. 1 is a schematic sectional view of a brake control device in which the coil assembly according to the present invention is used, and FIG. 2 is an exploded perspective view of the brake control device. The brake control device is interposed between the master cylinder of the vehicle and the wheel cylinder of each wheel, and controls the brake hydraulic pressure supplied to the wheel cylinder of each wheel based on the wheel speed, etc. A case in which a fluid passage (not shown), which is a part of piping, is formed in a box shape from a body 3 and a cover 4 and laminated on one surface of the fluid block 1. 2 and an electric motor 5 attached to the other surface of the hydraulic block 1. The electric motor 5 drives a plunger pump (not shown) arranged inside the hydraulic block 1. In order to increase and decrease the brake hydraulic pressure supplied to each wheel using this plunger pump, a plurality of (for example, 15) solenoid valves 11 are provided across the hydraulic block 1 and the case 2. It has been. Specifically, the solenoid valve 11 includes a valve body 12 inserted into the valve insertion hole 14 of the hydraulic block 1 and a coil assembly 13 that drives the valve body 12 in the axial direction. Is disposed on the case 2 side, specifically on the bottom surface of the body 3, as will be described later. Around the plurality of solenoid valves 11, pressure sensors 22 are provided at three locations in order to detect the hydraulic pressure of each part. The plurality of solenoid valves 11 include a normally open solenoid valve and a normally closed solenoid valve. Here, however, the two are not particularly distinguished from each other.

  The hydraulic block 1 is formed in a block shape from a metal, for example, an aluminum alloy. The fluid passage is formed in a predetermined circuit shape inside, and a plurality of hydraulic ports 6 are provided on a side surface. The hydraulic pipes connected to the wheel cylinders and the like are connected to the plurality of hydraulic ports 6.

  The body 3 is molded using, for example, a hard synthetic resin, and has a bottom wall 15 that is recessed with respect to the block-side flange portion 16B serving as a mounting surface with the hydraulic block 1, and a cover 4 on the periphery. Is provided with a cover side flange portion 16A. A connector 19 having a plurality of terminals 18 is disposed on one side of the body 3 that protrudes laterally from the hydraulic block 1. The cover 4 is made of, for example, a metal plate press-molded product or an aluminum alloy die-cast, and covers the entire opening surface of the body 3 by being attached to the cover-side flange portion 16A.

  The bottom wall 15 of the body 3 is separated from the surface of the hydraulic block 1, and the coil assembly 13 is disposed between them. In other words, a plurality of coil assemblies 13 are accommodated in a space formed on the inner peripheral side of the block side flange portion 16 </ b> B of the body 3 in contact with the hydraulic block 1. In addition, a circuit board 17 on which an electric circuit for driving the solenoid valve 11 is formed is accommodated in the case 2 including the body 3 and the cover 4. The circuit board 17 is disposed substantially in parallel with the bottom wall 15 of the body 3, and a predetermined interval is provided between the circuit board 17 and the bottom wall 15. A large number of electronic components (not shown) are mounted on the circuit board 17. A plurality of terminals 18 extending from the connector 19 are connected to the circuit board 17.

  3 and 4 are a bottom view and a perspective view showing the configuration of the bottom side of the body 3. As shown in the figure, a block side flange portion 16B joined to the hydraulic block 1 is formed in a substantially continuous rectangular shape, and a connector 19 is located outside the block side flange portion 16B. A plurality of, for example, 15 coil assemblies 13 are densely arranged in the region surrounded by the block-side flange portion 16B. Specifically, four coil assemblies 13 are arranged adjacent to each other so as to be positioned at the vertices of the quadrilateral as one group, and the four coil assemblies 13 are also arranged as one group adjacent to this group. They are arranged adjacent to each other so as to be located at the vertices of the rectangle. Between these two groups, a motor post 21 protruding in a columnar shape is arranged for electrical connection with the electric motor 5. Further, in the remaining area adjacent to the above two groups, three coil assemblies 13 and four coil assemblies 13 arranged in a row are arranged so as to be shifted by a half pitch, respectively. Seven coil assemblies 13 are arranged. As will be described in detail later, each coil assembly 13 has a substantially cylindrical outer shape, and a very small gap is provided between two adjacent coil assemblies 13. . In other words, 15 coil assemblies 13 are arranged as densely as possible in order to reduce the size of the body 3 while ensuring a very small gap between adjacent coil assemblies 13.

  FIG. 10 is a perspective view showing a basic configuration of the coil assembly 13. A pair of coil assemblies 13 extending in the axial direction of the coil assembly 13 are formed on one end surface of the coil assembly 13 having a substantially cylindrical shape as a whole. A terminal 31 is provided. The terminal 31 is molded in a terminal support base 32 made of synthetic resin so as to protrude from the end face of the coil assembly 13, and the base end of the terminal 31 serves as a terminal connection base 32 as a winding connection portion 31 a. Projecting sideways. The terminal support base portion 32 is offset from the center of the coil assembly 13 to one side, and is formed to project into a wall shape curved in a concentric arc shape with the coil assembly 13. The terminal 31 is bent along the axial direction of the coil assembly 13 after being bent outward from the base portion held by the terminal support base 32 in the radial direction of the coil assembly 13. Further, a groove 33 extending along the axial direction of the coil assembly 13 is formed at a position between the pair of terminals 31 on the outer peripheral surface of the terminal support base 32 (surface facing the outer periphery of the cylinder). In addition, a rectangular opening 34 that penetrates the terminal support base 32 along the radial direction of the cylinder is provided at the terminal position of the concave groove 33. Further, one end surface of the coil assembly 13 provided with the terminal support base 32 is provided with three pins 35 having a circular cross section protruding in the axial direction of the coil assembly 13.

  FIG. 5 is an enlarged cross-sectional view of a portion A in FIG. As shown in FIG. 5, the pair of terminals 31 of each coil assembly 13 penetrates through holes in the circuit board 17 and is soldered to the circuit board 17. By soldering the terminals 31, each coil assembly 13 is fixedly supported on the bottom surface of the body 3 (bottom wall 15).

  6 is a perspective view showing the configuration of the upper surface side of the body 3 with the circuit board 17 removed, FIG. 7 is an enlarged perspective view showing a part (X portion), and FIG. FIG. 9 is a perspective view showing a configuration of the upper surface side of the body 3 in a state before the assembly 13 is attached, and FIG. 9 is a perspective view showing an enlarged part (Y portion). As shown in these drawings, corresponding to the position of each coil assembly 13, a terminal guide 23 rising in a prismatic shape is formed on the bottom wall 15 of the body 3. Terminal guide holes 24 corresponding to the respective terminals 31 are formed through the top surface 23 a of the terminal guide 23, and the terminals 31 of the coil assembly 13 extend upward through the terminal guide holes 24. Yes. Since the top surface 23 a of the terminal guide 23 is close to the circuit board 17 through a slight gap, the terminal 31 is inserted into the terminal guide hole 24 and is regulated at a predetermined position near the circuit board 17. Thus, the terminal 31 can be easily inserted into the through hole of the circuit board 17.

  Here, in the remaining 12 coil assemblies 13 other than the three coil assemblies 13 arranged in a row, the two adjacent coil assemblies 13 are combined so that they are back to back, It is arranged on the body 3. That is, the two coil assemblies 13 that are paired with each other are arranged in such a posture that the terminal support bases 32 are adjacent to each other. Then, with respect to the two coil assemblies 13 that are paired in this way, as shown in FIGS. 7 and 9, one terminal guide 23 having a square top surface 23 a is formed between the two coil assemblies 13. A total of four terminal guide holes 24 are provided on the top surface 23 a of the terminal guide 23. That is, a total of four terminals 31 of the two coil assemblies 13 that are paired are held by one terminal guide 23. As shown in FIG. 9, on the both sides of the terminal guide 23, in order to avoid interference with the terminal support base 32, the winding connection part 31a, etc., the bottom wall 15 is shaped like an ellipse divided into two. An opening 25 is formed, and three positioning holes 25a are formed therethrough.

  The terminal guide 23 further includes a coil support hook 26 that engages with the opening 34 of the terminal support base 32 on the side surface 23 b facing the coil assembly 13. The coil support hook 26 is formed integrally with the terminal guide 23 and extends downward from the vicinity of the top surface 23a (to the back surface side of the bottom wall 15) at the center portion of the opened side surface 23b. It is comprised from the part 26a and the nail | claw part 26b provided in the front-end | tip of this arm part 26a. The arm portion 26 a can be elastically curved and deformed along the radial direction of the coil assembly 13. When the coil assembly 13 is inserted from the back surface side of the bottom wall 15, the claw portion 26 b is formed into the concave groove 33. And naturally engages with the opening 34 by the elasticity of the arm 26a (see FIG. 7). In this way, the coil support hook 26 is engaged with the opening 34 of the terminal support base 32, so that the coil assembly 13 is temporarily fixed to the body 3 before the terminal 31 is soldered to the circuit board 17. . Accordingly, it is possible to prevent the coil assembly 13 from being detached from the body 3 before soldering to the circuit board 17. Further, even after soldering, a part of the load acting on the coil assembly 13 due to vibration or the like is supported by the engagement of the coil support hook 26 and the opening 34, so that the stress at the soldered portion is relieved. As described above, in the substantially positive terminal guide 23 for the two coil assemblies 13 that are paired, the coil support hooks 26 are provided on the two side surfaces 23b facing the opposite sides.

  As shown in FIG. 8, the terminal guides 23 for the three coil assemblies 13 arranged in a row are rectangular top surfaces 23 a having two terminal guide holes 24 corresponding to the individual coil assemblies 13. It is relatively small with The terminal guide 23 is similarly provided with a coil support hook 26.

  As a procedure for attaching the coil assembly 13 to the body 3, for example, before attaching the circuit board 17 to the body 3, the terminal 31 of the coil assembly 13 is connected to the terminal guide hole of the terminal guide 23 from the bottom surface side of the bottom wall 15. While being inserted into 24, the coil assembly 13 is pushed into a predetermined position. Thereby, the coil support hook 26 of the terminal guide 23 mentioned above engages with the opening 34 on the coil assembly 13 side, and the coil assembly 13 is temporarily held. At this time, the three pins 35 on the end face of the coil assembly 13 respectively enter the positioning holes 25a of the bottom wall 15 (see FIG. 5), and the mounting position of the coil assembly 13 is reliably defined. Next, the circuit board 17 is disposed at a predetermined position of the body 3 and the terminals 31 protruding from the through holes of the circuit board 17 are soldered. As a result, the plurality of coil assemblies 13 are fixedly supported to the circuit board 17 and the body 3.

[First embodiment of coil assembly]
Next, with reference to FIG. 10 and FIGS. 11-21, the structure of the coil assembly 13 which is the principal part of this invention is demonstrated in detail.

  FIG. 10 is a perspective view showing the coil assembly 13 of the first embodiment. 11 is a front view of the coil assembly 13, FIG. 12 is a bottom view, FIG. 13 is a top view, and FIG. 14 is a cross-sectional view. In the first embodiment, the coil assembly 13 includes a coil bobbin 42 around which a coil 41 (see FIG. 14) is wound, a cylindrical first yoke 43 having an open end that accommodates the coil bobbin 42, and The second yoke 44 is disposed along the opening end of the first yoke 43.

  15 is a perspective view showing the coil bobbin 42 as a single unit, FIG. 16 is a front view of the same, and FIG. 17 is a top view of the same. The coil bobbin 42 is integrally formed of hard synthetic resin, and has a cylindrical shaft portion 45 around which the coil 41 is wound as shown in the figure. A first flange 47 and a second flange 48 projecting in the radial direction are formed at both ends of the shaft portion 45, which have a shaft through hole 46 having a circular cross section passing therethrough. The first flange 47 and the second flange 48 have an annular shape, and their outer diameters are equal to each other. Note that the shaft through hole 46 is formed concentrically with the shaft portion 45, and therefore the shaft portion 45 is substantially cylindrical. The terminal support base 32 described above is integrally formed on the end surface of the second flange 48 in the axial direction, and as described above, the pair of terminals 31 are molded therein. As described above, the terminal support base 32 has the opening 34 (see FIG. 14) with which the coil support hook 26 engages and the concave groove 33 that guides the coil support hook 26. Moreover, the base part of the terminal 31 is exposed as a winding connection part 31a, and the end part of the wire of the coil 41 is connected thereto. Further, the three pins 35 described above are integrally formed on the end surface of the second flange 48. The three pins 35 are provided at intervals of 90 °, for example.

  Further, on the inner peripheral surface of the shaft through hole 46, for example, three projecting portions 49 protruding inward in the radial direction are provided. In this embodiment, the protrusion 49 is continuously formed linearly over the entire length of the shaft through hole 46. Each protrusion 49 protrudes from the inner peripheral surface of the shaft through hole 46 in a semicircular or arcuate cross section.

  FIG. 18 is a perspective view showing the first yoke 43 alone. The first yoke 43 is integrally formed from a magnetic metal such as an iron-based material, and includes an end wall 51 that faces the first flange 47 of the coil bobbin 42 (see FIG. 14), and this end. And a cylindrical side wall portion 52 erected from the peripheral edge of the wall portion 51. The inner diameter of the side wall 52 is set to be slightly larger than the outer diameters of the first flange 47 and the second flange 48 of the coil bobbin 42. Further, the length of the side wall portion 52 along the axial direction is slightly larger than the total length of the coil bobbin 42. In addition, the side wall part 52 may have a polygonal cross-sectional shape, and may have a slit-shaped opening part. A circular through hole 53 is provided at the center of the end wall 51, and the opening edge of the through hole 53 is formed as a first rising wall 54 that rises toward the inside of the first yoke 43. . That is, the first rising wall 54 provided at the opening edge of the through hole 53 has a relatively short cylindrical shape extending in parallel with the side wall 52 from the end wall 51.

  The outer diameter of the cylindrical first rising wall 54 is smaller than the inner diameter of the shaft through hole 46 of the coil bobbin 42 and is a virtual circle connecting the apexes of the three protrusions 49 of the shaft through hole 46. It is larger than the diameter. Therefore, when the shaft through hole 46 of the coil bobbin 42 is pushed into the first rising wall 54 with an appropriate load, both are brought into a so-called press-fit state and are coupled to each other. The load necessary for the press-fitting operation and the holding force obtained after the press-fitting can be adjusted by setting the outer diameter of the first rising wall 54, the dimensions of the protrusions 49, and the like. Further, it is desirable that the first yoke 43 is set so as not to be separated depending on its own weight.

  FIG. 19 is a perspective view showing the second yoke 44 alone, FIG. 20 is a front view, and FIG. 21 is a bottom view. Similar to the first yoke 43, the second yoke 44 is integrally formed from a metal that is a magnetic material, for example, an iron-based material. As shown in FIG. 21, the second yoke 44 is formed outside the second flange 48 of the coil bobbin 42. It has a disk shape with a diameter substantially equal to the diameter (in other words, a diameter slightly smaller than the inner diameter of the side wall portion 52 of the first yoke 43). The second yoke 44 is disposed so as to overlap the second flange 48 of the coil bobbin 42, and has a circular arc shape so as to avoid the terminal support base portion 32 on the second flange 48 and the winding connection portion 31 a of the terminal 31. A notch 61 having a shape is provided. In addition, three circular pin fitting holes 62 through which the three pins 35 provided in the second flange 48 respectively pass are provided. In this embodiment, the diameter of the pin fitting hole 62 is relatively larger than the outer diameter of the pin 35, and the pin 35 is free in the pin fitting hole 62. A circular through hole 63 is provided at the center of the circular second yoke 44, and the opening edge of the through hole 63 is formed as a second rising wall 64 that stands up toward the inside of the first yoke 43. Has been. That is, the second rising wall 64 provided at the opening edge of the through hole 63 has a relatively short cylindrical shape extending perpendicularly to the surface of the second yoke 44.

  The outer diameter of the second rising wall 64 having the cylindrical shape is smaller than the inner diameter of the shaft through hole 46 of the coil bobbin 42 and the three shaft through holes 46 are the same as the first rising wall 54 described above. It is larger than the diameter of the imaginary circle connecting the vertices of the protrusions 49. Therefore, when the shaft through hole 46 of the coil bobbin 42 is pushed into the second rising wall 64 with an appropriate load, both are brought into a so-called press-fit state and are coupled to each other. The load necessary for the press-fitting operation and the holding force obtained after the press-fitting can be adjusted by setting the outer diameter of the second rising wall 64, the dimensions of the projections 49, and the like. Further, it is desirable that the first yoke 43 is set so as not to be separated depending on its own weight.

  Therefore, in a state in which the coil bobbin 42, the first yoke 43, and the second yoke 44 are assembled, the first yoke 43 is coupled to the coil bobbin 42 at one end in the axial direction of the coil bobbin 42 as shown in FIG. The second yoke 44 is coupled to the coil bobbin 42 at the other axial end of the coil bobbin 42. The second yoke 44 is positioned so as to overlap the second flange 48 of the coil bobbin 42, and is disposed on the inner peripheral side of the side wall portion 52 of the first yoke 43. Thereby, the opening end of the first yoke 43 is substantially covered by the second yoke 44, and a continuous magnetic path is formed by the first yoke 43 and the second yoke 44. The first yoke 43 and the second yoke 44 are basically not engaged with each other. That is, the first yoke 43 and the second yoke 44 are integrally assembled with the coil bobbin 42 made of synthetic resin as a medium. Therefore, the coil assembly 13 can be integrated without requiring a conventional press-fitting operation between metal parts. As described above, since the coil bobbin 42 in the coil assembly 13 is fixedly supported with respect to the circuit board 17 and the body 3, the first state is obtained when the coil assembly 13 is assembled to the body 3. The yoke 43 is held via the coil bobbin 42.

[Second Embodiment of Coil Assembly]
Next, the coil assembly 13 according to the second embodiment will be described with reference to FIGS. In the following description of the second to sixth embodiments, a configuration different from the first embodiment will be mainly described. 22 is a cross-sectional view of the coil assembly 13 of the second embodiment, FIG. 23 is an enlarged view of a portion B in FIG. 22, and FIG. 24 is an enlarged view of a portion C. In the second embodiment, the outer diameter of the first flange 47 of the coil bobbin 42 is set slightly larger than the inner diameter of the side wall 52 of the first yoke 43. The second flange 48 is slightly smaller in diameter than the inner diameter of the side wall 52 of the first yoke 43, as in the first embodiment. That is, the first flange 47 and the second flange 48 have different diameters, and the first flange 47 has a larger diameter. On the other hand, the first rising wall 54 of the first yoke 43 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Alternatively, the first rising wall 54 may not be provided.

  Therefore, by pushing the coil bobbin 42 into the first yoke 43 with an appropriate load, the outer peripheral end of the first flange 47 is fitted into the inner peripheral surface of the side wall portion 52 in a press-fit state as shown in FIG. As a result, the first yoke 43 is coupled to the coil bobbin 42. The second flange 48 having a relatively small diameter does not have a press-fitting relationship with the side wall portion 52 as shown in FIG.

  Note that the opening edge of the side wall 52 of the first yoke 43 has a tapered surface 52a as shown in FIG. As a result, the first flange 47 is smoothly guided to the inside of the side wall portion 52.

  The relationship between the second yoke 44 and the coil bobbin 42 is the same as that of the first embodiment described above, and the second rising wall 64 of the second yoke 44 is connected to the shaft through hole 46 (specifically, three protrusions 49) of the coil bobbin 42. ) In a press-fit state.

[Third embodiment of coil assembly]
Next, the coil assembly 13 of the third embodiment will be described with reference to FIGS. 25 is a cross-sectional view of the coil assembly 13 of the third embodiment, FIG. 26 is an enlarged view of a portion D in FIG. 25, and FIG. 27 is an enlarged view of an E portion. In the third embodiment, the outer diameter of the second flange 48 of the coil bobbin 42 is set slightly larger than the inner diameter of the side wall 52 of the first yoke 43. The first flange 47 has a slightly smaller diameter than the inner diameter of the side wall 52 of the first yoke 43, as in the first embodiment. That is, the first flange 47 and the second flange 48 have different diameters, and the second flange 48 has a larger diameter. On the other hand, the first rising wall 54 of the first yoke 43 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Alternatively, the first rising wall 54 may not be provided.

  Therefore, by pushing the coil bobbin 42 into the first yoke 43 with an appropriate load, the outer peripheral end of the second flange 48 is fitted into the inner peripheral surface of the side wall 52 in a press-fit state as shown in FIG. As a result, the first yoke 43 is coupled to the coil bobbin 42. The first flange 47 having a relatively small diameter does not have a press-fitting relationship with the side wall portion 52, as shown in FIG.

  The opening edge of the side wall 52 of the first yoke 43 is a tapered surface 52a as shown in FIG. As a result, the second flange 48 is smoothly guided to the inside of the side wall 52.

  The relationship between the second yoke 44 and the coil bobbin 42 is the same as that of the first embodiment described above, and the second rising wall 64 of the second yoke 44 is connected to the shaft through hole 46 (specifically, three protrusions 49) of the coil bobbin 42. ) In a press-fit state.

  The third embodiment is more advantageous than the second embodiment in that the moving distance of the second flange 48 that is press-fitted into the side wall portion 52 of the first yoke 43 is short. That is, in the second embodiment, the first flange 47 must slide over almost the entire length of the side wall 52 while being press-fitted into the side wall 52. On the other hand, in the third embodiment, the second flange 48 is slightly pushed in from the opening end of the side wall portion 52, and the moving distance during press-fitting is shortened. Therefore, there is less concern about wear or loss of the second flange 48 during press fitting.

[Fourth Example of Coil Assembly]
Next, with reference to FIGS. 28-30, the coil assembly 13 of 4th Example is demonstrated. 28 is a cross-sectional view of the coil assembly 13 of the fourth embodiment, FIG. 29 is an enlarged view of a portion F in FIG. 28, and FIG. 30 is a perspective view of the coil bobbin 42 in the fourth embodiment. In the fourth embodiment, the entire circumference of the first flange 47 is press-fitted into the inner circumference of the side wall portion 52 of the first yoke 43 in the second embodiment described above. The part is partially press-fitted.

  That is, in the fourth embodiment, the outer diameter itself of the first flange 47 of the coil bobbin 42 is set to be slightly smaller than the inner diameter of the side wall portion 52 of the first yoke 43 as in the first embodiment. And the protrusion part 71 which protruded to the outer peripheral side is formed in several places of the outer periphery of this 1st flange 47, for example, three places, and the diameter of the virtual circle which connects the vertex of these several protrusion parts 71 is 1st. The inner diameter of the side wall 52 of the yoke 43 is slightly larger. The protrusion 71 projects from the outer peripheral edge of the first flange 47 so as to form an arc shape. As in the first embodiment, the second flange 48 is slightly smaller in diameter than the inner diameter of the side wall 52 of the first yoke 43, and has no protrusion. That is, the first flange 47 and the second flange 48 have basically the same diameter. Further, the first rising wall 54 of the first yoke 43 is formed with a relatively small diameter so as not to be press-fitted into the shaft through hole 46 of the coil bobbin 42. Alternatively, the first rising wall 54 may not be provided.

  Therefore, by pushing the coil bobbin 42 into the first yoke 43 with an appropriate load, the three protrusions 71 of the first flange 47 are fitted into the inner peripheral surface of the side wall 52 in a press-fit state as shown in FIG. Match. As a result, the first yoke 43 is coupled to the coil bobbin 42.

  The opening edge of the side wall 52 of the first yoke 43 is also a tapered surface 52a. Thereby, the protrusion 71 of the first flange 47 is smoothly guided to the inside of the side wall 52.

  The relationship between the second yoke 44 and the coil bobbin 42 is the same as that of the first embodiment described above, and the second rising wall 64 of the second yoke 44 is connected to the shaft through hole 46 (specifically, three protrusions 49) of the coil bobbin 42. ) In a press-fit state.

  In the fourth embodiment, as compared with the configuration in which the entire circumferences of the flanges 47 and 48 are press-fitted as in the second and third embodiments, the portion having the press-fitting relationship is partial, so that the load required for press-fitting Becomes smaller. The coil bobbin 42 can be reliably held in the first yoke 43 even with such a small load press-fitting.

[Fifth embodiment of coil assembly]
Next, a coil assembly 13 according to a fifth embodiment will be described with reference to FIGS. 31 is a cross-sectional view of the coil assembly 13 of the fifth embodiment, FIG. 32 is an enlarged view of a portion G in FIG. 31, and FIG. 33 is a perspective view of the coil bobbin 42 in the fifth embodiment. In the fourth embodiment, the entire circumference of the second flange 48 is press-fitted into the inner circumference of the side wall portion 52 of the first yoke 43 in the third embodiment described above. The part is partially press-fitted.

  That is, in the fifth embodiment, the outer diameter of the second flange 48 of the coil bobbin 42 is set to be slightly smaller than the inner diameter of the side wall portion 52 of the first yoke 43 as in the first embodiment. And the protrusion part 72 which protruded to the outer peripheral side is formed in the several places of the outer periphery of this 2nd flange 48, for example, three places, and the diameter of the virtual circle which connects the vertex of these several protrusion parts 72 is 1st. The inner diameter of the side wall 52 of the yoke 43 is slightly larger. The protrusion 72 protrudes from the outer peripheral edge of the second flange 48 so as to form an arc shape. As in the first embodiment, the first flange 47 has a slightly smaller diameter than the inner diameter of the side wall 52 of the first yoke 43 and does not have a protrusion. That is, the first flange 47 and the second flange 48 have basically the same diameter. Further, the first rising wall 54 of the first yoke 43 is formed with a relatively small diameter so as not to be press-fitted into the shaft through hole 46 of the coil bobbin 42. Alternatively, the first rising wall 54 may not be provided.

  Therefore, by pushing the coil bobbin 42 into the first yoke 43 with an appropriate load, the three protrusions 72 of the second flange 48 are fitted into the inner peripheral surface of the side wall 52 in a press-fit state as shown in FIG. Match. As a result, the first yoke 43 is coupled to the coil bobbin 42.

  The opening edge of the side wall 52 of the first yoke 43 is also a tapered surface 52a. Thereby, the protrusion 72 of the second flange 48 is smoothly guided to the inside of the side wall 52.

  The relationship between the second yoke 44 and the coil bobbin 42 is the same as that of the first embodiment described above, and the second rising wall 64 of the second yoke 44 is connected to the shaft through hole 46 (specifically, three protrusions 49) of the coil bobbin 42. ) In a press-fit state.

  Similar to the third embodiment, the fifth embodiment is advantageous in that the moving distance of the second flange 48 that is press-fitted into the side wall portion 52 of the first yoke 43 is short. Furthermore, as compared with the configuration in which the entire circumference of the flanges 47 and 48 is press-fitted as in the second and third embodiments, the portion that becomes the press-fitting relationship is partial, so the load required during press-fitting is reduced. The coil bobbin 42 can be reliably held in the first yoke 43 even with such a small load press-fitting.

[Sixth embodiment of coil assembly]
Next, the coil assembly 13 of the sixth embodiment will be described with reference to FIGS. 34 is a perspective view of the entire coil assembly 13, FIG. 35 is a front view, FIG. 36 is a top view, and FIG. 37 is a bottom view. 38 is a cross-sectional view of the entire coil assembly 13, FIG. 39 is an enlarged view of the H portion in FIG. 38, and FIG. 40 is an enlarged view of the J portion. FIGS. 41 and 42 are perspective views of the coil bobbin 42 in the sixth embodiment as seen from different directions. FIG. 43 is a perspective view showing the first yoke 43 in the sixth embodiment, and FIG. 44 is a perspective view showing the second yoke 44 in the sixth embodiment.

  As shown in FIGS. 41 and 42, the coil bobbin 42 is provided with the three pins 35 having the circular cross section described above on the outer end surface of the second flange 48, and further, on the outer end surface of the first flange 47, Three pins 81 having the same circular cross section are provided. The pin 81 protrudes along the axial direction of the coil bobbin 42 like the pin 35, but its length is shorter than the pin 35. The number of pins 35 and pins 81 is arbitrary, and is not necessarily limited to three.

  As shown in FIG. 43, three pin fitting holes 83 corresponding to the pins 81 on the first flange 47 are formed through the end wall portion 51 of the first yoke 43. Here, the diameter of the pin fitting hole 83 is slightly smaller than the outer diameter of the pin 81. When the pin 81 is fitted into the pin fitting hole 83 as shown in FIG. Each dimensional relationship is set so as to be in a state. The first rising wall 54 of the first yoke 43 is formed with a relatively small diameter so as not to be press-fitted into the shaft through hole 46 of the coil bobbin 42. Alternatively, the first rising wall 54 may not be provided. Further, the protrusion 49 on the inner peripheral surface of the shaft through hole 46 described in the first embodiment is not provided.

  Therefore, when the coil bobbin 42 is pushed into the first yoke 43 with an appropriate load, the pin 81 on the first flange 47 is inserted into the pin fitting hole 83 in the end wall portion 51 of the first yoke 43 as shown in FIG. Fit in the press-fit state. As a result, the first yoke 43 is coupled to the coil bobbin 42.

  As shown in FIG. 44, the second yoke 44 is formed with three pin fitting holes 62 corresponding to the pins 35 on the second flange 48. Here, in the sixth embodiment, the diameter of the pin fitting hole 62 is slightly smaller than the outer diameter of the pin 35, and the pin 35 is fitted into the pin fitting hole 62 as shown in FIG. Sometimes, the dimensional relationship is set so that both are in a press-fitted state. The second rising wall 64 of the second yoke 44 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Alternatively, the second rising wall 64 may not be provided.

  Accordingly, by inserting the pin fitting hole 62 into the pin 35 of the coil bobbin 42 and then pushing the second yoke 44 with an appropriate load, the pin 35 on the second flange 48 is moved to the second position as shown in FIG. The yoke 44 is fitted into the pin fitting hole 62 in a press-fitted state. As a result, the second yoke 44 is coupled to the coil bobbin 42.

  In this manner, in the state where the coil bobbin 42, the first yoke 43, and the second yoke 44 are assembled, as shown in FIG. 38, the first yoke 43 is connected to the coil bobbin 42 at one end in the axial direction of the coil bobbin 42. The second yoke 44 is coupled to the coil bobbin 42 at the other axial end of the coil bobbin 42. The second yoke 44 is positioned so as to overlap the second flange 48 of the coil bobbin 42, and is disposed on the inner peripheral side of the side wall portion 52 of the first yoke 43. Thereby, the opening end of the first yoke 43 is substantially covered by the second yoke 44, and a continuous magnetic path is formed by the first yoke 43 and the second yoke 44. The first yoke 43 and the second yoke 44 are basically not engaged with each other. That is, the first yoke 43 and the second yoke 44 are integrally assembled with the coil bobbin 42 made of synthetic resin as a medium. Therefore, the coil assembly 13 can be integrated without requiring a conventional press-fitting operation between metal parts. As described above, since the coil bobbin 42 in the coil assembly 13 is fixedly supported with respect to the circuit board 17 and the body 3, the first state is obtained when the coil assembly 13 is assembled to the body 3. The yoke 43 is held via the coil bobbin 42.

  In this embodiment, the coil bobbin 42 and the first yoke 43 are coupled to each other at a plurality of locations, so that the dropout due to vibration or the like is less likely to occur. The pin 35 on the second flange 48 side is for positioning the coil assembly 13 with respect to the body 3 as described above, and the second yoke 44 is fixedly held by using the positioning pin 35. Therefore, the configuration becomes simple. In addition to the positioning pins 35, it is possible to add pins for coupling to the second yoke 44.

  Further, the coupling structure of the first yoke 43 or the second yoke 44 in the sixth embodiment is applied in combination with the coupling structure of the first yoke 43 or the second yoke 44 shown in the first to fifth embodiments. It is possible. For example, the second yoke 44 and the coil bobbin 42 can be coupled in a manner as in the first embodiment, and the first yoke 43 and the coil bobbin 42 can be coupled in a manner as in the sixth embodiment. Alternatively, the first yoke 43 and the coil bobbin 42 can be coupled in the manner as in the second to fifth embodiments, and the second yoke 44 and the coil bobbin 42 can be coupled in the manner as in the sixth embodiment.

[Seventh embodiment of coil assembly]
In each of the embodiments of the coil assembly 13 after the seventh embodiment described below, the basic configuration of the yoke is changed. That is, in the first to sixth embodiments described above, the first yoke 43 and the second yoke 44 are combined as yokes constituting a closed magnetic circuit, whereas in each of the following embodiments, only a single yoke 101 is used. It has. In other words, the coil assembly 13 according to the seventh embodiment includes a coil bobbin 42 around which the coil 41 (see FIG. 46) is wound, and a cylindrical yoke 101 having one end opened to accommodate the coil bobbin 42. Consists of parts.

  45 is a perspective view of the entire coil assembly 13 of the seventh embodiment, FIG. 46 is a sectional view, and FIG. 47 is a top view. FIG. 48 is a perspective view of the coil bobbin 42 in the seventh embodiment. 49 and 50 are a top view and a perspective view of the yoke 101 in the seventh embodiment.

  The coil bobbin 42 is the same as the coil bobbin 42 of the first embodiment described above. That is, the coil bobbin 42 is integrally molded with hard synthetic resin, and has a cylindrical shaft portion 45 around which the coil 41 is wound, as shown in FIG. A first flange 47 and a second flange 48 projecting in the radial direction are formed at both ends of the shaft portion 45. The first flange 47 and the second flange 48 have an annular shape, and their outer diameters are equal to each other. The shaft through hole 46 is formed concentrically with the shaft portion 45, and thus the shaft portion 45 is substantially cylindrical. The terminal support base 32 described above is integrally formed on the end surface of the second flange 48 in the axial direction, and as described above, the pair of terminals 31 are molded therein (see FIG. 45). The base part of the terminal 31 is exposed as a winding connection part 31a, and the ends of the wires of the coil 41 (see FIG. 46) are respectively connected thereto. As described above, the terminal support base 32 has the opening 34 with which the coil support hook 26 is engaged and the concave groove 33 that guides the coil support hook 26. In FIG. 48, the terminal 31 is not shown, and only the synthetic resin portion is shown. The three pins 35 described above are integrally formed on the end surface of the second flange 48. The three pins 35 are provided at intervals of 90 °, for example.

  Further, as described in the first embodiment, on the inner peripheral surface of the shaft through hole 46, for example, three projecting portions 49 projecting inward in the radial direction are provided. In this embodiment, the protrusion 49 is continuously formed linearly over the entire length of the shaft through hole 46. Each protrusion 49 protrudes from the inner peripheral surface of the shaft through hole 46 in a semicircular or arcuate cross section.

  The yoke 101 is integrally formed from a magnetic metal such as an iron-based material. As shown in FIG. 50, the yoke 101 has an end wall 103 facing the second flange 48 of the coil bobbin 42 and the end. And a cylindrical side wall 104 standing from the periphery of the wall 103. The inner diameter of the side wall 104 is set slightly larger than the outer diameters of the first flange 47 and the second flange 48 of the coil bobbin 42. The length of the side wall portion 104 along the axial direction is slightly larger than the total length of the coil bobbin 42. Note that the side wall portion 104 may have a polygonal cross-sectional shape, or may have a slit-like opening. A circular through hole 105 is provided at the center of the end wall 103, and the opening edge of the through hole 105 is formed as a rising wall 106 that stands up toward the inside of the yoke 101. That is, the rising wall 106 provided at the opening edge of the through hole 105 has a relatively short cylindrical shape extending from the end wall portion 103 in parallel with the side wall portion 104.

  The outer diameter of the cylindrical rising wall 106 is smaller than the inner diameter of the shaft through hole 46 of the coil bobbin 42 and is larger than the diameter of a virtual circle connecting the apexes of the three protrusions 49 of the shaft through hole 46. Is big. Therefore, when the shaft through hole 46 of the coil bobbin 42 is pushed into the rising wall 106 with an appropriate load, both are brought into a so-called press-fit state and are coupled to each other. The load necessary for the press-fitting operation and the holding force obtained after the press-fitting can be adjusted by setting the outer diameter of the rising wall 106, the dimensions of the protrusion 49, and the like. Depending on the weight of 101, it is desirable to set it so as not to separate.

  Since the end wall portion 103 is disposed so as to overlap the second flange 48 of the coil bobbin 42, an arc shape is formed so as to avoid the terminal support base portion 32 on the second flange 48 and the winding connection portion 31 a of the terminal 31. An opening 108 is provided. Further, three circular pin fitting holes 109 through which the three pins 35 provided in the second flange 48 respectively pass are provided. In the seventh embodiment, the diameter of the pin fitting hole 109 is relatively larger than the outer diameter of the pin 35, and the pin 35 is in a free state in the pin fitting hole 109.

  Therefore, in a state where the coil bobbin 42 and the yoke 101 are assembled, the yoke 101 is coupled to the coil bobbin 42 at one end in the axial direction of the coil bobbin 42 and integrated as a coil assembly 13 as shown in FIG. The yoke 101 forms a magnetic path that surrounds the coil 41, although a part thereof becomes an air gap. Therefore, the coil assembly 13 can be integrated without requiring a conventional press-fitting operation between metal parts. In particular, even before the coil assembly 13 is assembled to the body 3, the coil bobbin 42 and the yoke 101 are not separated, and the assembly to the body 3 is facilitated. As described above, since the coil bobbin 42 in the coil assembly 13 is fixedly supported with respect to the circuit board 17 and the body 3, the yoke 101 is attached in a state where the coil assembly 13 is assembled to the body 3. Is held via the coil bobbin 42.

[Eighth embodiment of coil assembly]
Next, with reference to FIGS. 51 to 53, a coil assembly 13 of an eighth embodiment which is a modification of the seventh embodiment will be described. In the following description of the eighth to twelfth embodiments, a configuration different from the seventh embodiment will be mainly described. 51 is a cross-sectional view of the coil assembly 13 of the eighth embodiment, FIG. 52 is an enlarged view of a K portion in FIG. 51, and FIG. 53 is an enlarged view of an L portion. In the eighth embodiment, the outer diameter of the second flange 48 of the coil bobbin 42 is set slightly larger than the inner diameter of the side wall portion 104 of the yoke 101. The first flange 47 has a slightly smaller diameter than the inner diameter of the side wall portion 104 of the yoke 101, as in the seventh embodiment. That is, the first flange 47 and the second flange 48 have different diameters, and the second flange 48 has a larger diameter. On the other hand, the rising wall 106 of the yoke 101 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Or the structure which does not comprise the standing wall 106 may be sufficient. Further, the protrusion 49 on the inner peripheral surface of the shaft through hole 46 described in the first embodiment or the seventh embodiment is not provided.

  Therefore, by pushing the coil bobbin 42 into the yoke 101 with an appropriate load, the outer peripheral end of the second flange 48 is fitted into the inner peripheral surface of the side wall portion 104 in a press-fit state as shown in FIG. As a result, the yoke 101 is coupled to the coil bobbin 42. The first flange 47 having a relatively small diameter is not press-fitted into the side wall portion 104.

  The opening edge of the side wall 104 of the yoke 101 is a tapered surface 104a as shown in FIG. As a result, the second flange 48 is smoothly guided to the inside of the side wall portion 104.

[Ninth embodiment of coil assembly]
Next, the coil assembly 13 of the ninth embodiment will be described with reference to FIGS. 54 is a cross-sectional view of the coil assembly 13 of the ninth embodiment, FIG. 55 is an enlarged view of an M portion in FIG. 54, and FIG. 56 is an enlarged view of an N portion. In the ninth embodiment, the outer diameter of the first flange 47 of the coil bobbin 42 is set slightly larger than the inner diameter of the side wall portion 104 of the yoke 101. The second flange 48 is slightly smaller in diameter than the inner diameter of the side wall portion 104 of the yoke 101, as in the seventh embodiment. That is, the first flange 47 and the second flange 48 have different diameters, and the first flange 47 has a larger diameter. On the other hand, the rising wall 106 of the yoke 101 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Or the structure which does not comprise the standing wall 106 may be sufficient. Further, the protrusion 49 on the inner peripheral surface of the shaft through hole 46 described in the first embodiment or the seventh embodiment is not provided.

  Therefore, by pushing the coil bobbin 42 into the yoke 101 with an appropriate load, the outer peripheral end of the first flange 47 is fitted into the inner peripheral surface of the side wall portion 104 in a press-fit state as shown in FIG. As a result, the yoke 101 is coupled to the coil bobbin 42. The second flange 48 having a relatively small diameter does not have a press-fitting relationship with the side wall portion 104.

  The opening edge of the side wall 104 of the yoke 101 is a tapered surface 104a as shown in FIG. Thereby, the 1st flange 47 is smoothly guided to the inner side of the side wall part 104. FIG.

  The ninth embodiment is more advantageous than the eighth embodiment in that the moving distance of the first flange 47 that is press-fitted into the side wall portion 104 of the yoke 101 is short. That is, in the eighth embodiment, the second flange 48 must slide over almost the entire length of the side wall portion 104 while being pressed into the side wall portion 104. On the other hand, in the ninth embodiment, the first flange 47 is slightly pushed in from the opening end of the side wall portion 104, and the moving distance during press-fitting is shortened. Therefore, there is less concern about wear or loss of the first flange 47 during press-fitting.

[Tenth embodiment of coil assembly]
Next, the coil assembly 13 according to the tenth embodiment will be described with reference to FIGS. 57 is a cross-sectional view of the coil assembly 13 according to the tenth embodiment, FIG. 58 is an enlarged view of a portion P in FIG. 57, and FIG. 59 is a perspective view of the coil bobbin 42 according to the tenth embodiment. In the tenth embodiment, the entire circumference of the second flange 48 is press-fitted into the inner circumference of the side wall 104 of the yoke 101 in the eighth embodiment described above, whereas a part of the outer circumference of the second flange 48 is used. It is designed to be partially press-fitted.

  That is, in the tenth embodiment, the outer diameter of the second flange 48 of the coil bobbin 42 is set slightly smaller than the inner diameter of the side wall portion 104 of the yoke 101 as in the seventh embodiment. And the protrusion part 111 which protruded to the outer peripheral side is formed in several places of the outer periphery of this 2nd flange 48, for example, three places, and the diameter of the virtual circle which connects the vertex of these several protrusion parts 111 is the yoke 101. It is slightly larger than the inner diameter of the side wall portion 104. The protrusion 111 projects from the outer peripheral edge of the first flange 47 so as to form an arc shape. As in the seventh embodiment, the first flange 47 is slightly smaller in diameter than the inner diameter of the side wall portion 104 of the yoke 101, and has no protrusion. That is, the first flange 47 and the second flange 48 have basically the same diameter. Further, the rising wall 106 of the yoke 101 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Or the structure which does not comprise the standing wall 106 may be sufficient. Further, the protrusion 49 on the inner peripheral surface of the shaft through hole 46 described in the first embodiment or the seventh embodiment is not provided.

  Therefore, by pushing the coil bobbin 42 into the yoke 101 with an appropriate load, the three protrusions 111 of the second flange 48 are fitted into the inner peripheral surface of the side wall 104 in a press-fit state as shown in FIG. . As a result, the yoke 101 is coupled to the coil bobbin 42.

  The opening edge of the side wall 104 of the yoke 101 is also a tapered surface 104a. Thereby, the protrusion 111 of the second flange 48 is smoothly guided to the inside of the side wall 104.

  Compared with the configuration in which the entire circumferences of the flanges 47 and 48 are press-fitted as in the eighth and ninth embodiments, the tenth embodiment has a partial press-fitting relationship, so the load required for press-fitting Becomes smaller. The coil bobbin 42 can be reliably held in the yoke 101 even with such a small load press-fitting.

[Eleventh embodiment of coil assembly]
Next, the coil assembly 13 of the eleventh embodiment will be described with reference to FIGS. 60 is a cross-sectional view of the coil assembly 13 of the eleventh embodiment, FIG. 61 is an enlarged view of a Q portion in FIG. 60, and FIG. 62 is a perspective view of the coil bobbin 42 in the eleventh embodiment. In the eleventh embodiment, the entire circumference of the first flange 47 is press-fitted into the inner circumference of the side wall portion 104 of the yoke 101 in the ninth embodiment, whereas a part of the outer circumference of the first flange 47 is used. It is designed to be partially press-fitted.

  That is, in the eleventh embodiment, the outer diameter itself of the first flange 47 of the coil bobbin 42 is set to be slightly smaller than the inner diameter of the side wall portion 104 of the yoke 101 as in the seventh embodiment. And the protrusion part 112 which protruded to the outer peripheral side is formed in several places of the outer periphery of this 1st flange 47, for example, three places, and the diameter of the virtual circle which connects the vertex of these several protrusion parts 112 is the yoke 101. It is slightly larger than the inner diameter of the side wall portion 104. The protrusion 112 protrudes from the outer peripheral edge of the first flange 47 so as to form an arc shape. As in the seventh embodiment, the second flange 48 is slightly smaller in diameter than the inner diameter of the side wall portion 104 of the yoke 101, and has no protrusion. That is, the first flange 47 and the second flange 48 have basically the same diameter. Further, the rising wall 106 of the yoke 101 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Or the structure which does not comprise the standing wall 106 may be sufficient. Further, the protrusion 49 on the inner peripheral surface of the shaft through hole 46 described in the first embodiment or the seventh embodiment is not provided.

  Therefore, by pushing the coil bobbin 42 into the yoke 101 with an appropriate load, the three protrusions 112 of the first flange 47 are fitted into the inner peripheral surface of the side wall 104 in a press-fit state as shown in FIG. . As a result, the yoke 101 is coupled to the coil bobbin 42.

  The opening edge of the side wall 104 of the yoke 101 is also a tapered surface 104a. Thereby, the protrusion 112 of the first flange 47 is smoothly guided to the inside of the side wall 104.

  Similar to the ninth embodiment, the eleventh embodiment is advantageous in that the moving distance of the first flange 47 that is press-fitted into the side wall portion 104 of the yoke 101 is short. Furthermore, as compared with the configuration in which the entire circumference of the flanges 47 and 48 is press-fitted as in the eighth and ninth embodiments, the portion required for press-fitting is partial, so the load required for press-fitting is reduced. The coil bobbin 42 can be reliably held in the yoke 101 even with such a small load press-fitting.

[Twelfth embodiment of coil assembly]
Next, the coil assembly 13 of the twelfth embodiment will be described with reference to FIGS. 63 is a perspective view of the coil assembly 13 of the twelfth embodiment, FIG. 64 is a cross-sectional view of the coil assembly 13, and FIG. 65 is an enlarged view of a portion R in FIG.

  As shown in these drawings, the coil bobbin 42 includes the above-described three pins 35 having a circular cross section on the outer end face of the second flange 48. The number of pins 35 is arbitrary and is not necessarily limited to three.

  Further, in the end wall portion 103 of the yoke 101, three pin fitting holes 109 corresponding to the pins 35 are formed so as to penetrate in the same manner as in the seventh embodiment. Here, the diameter of the pin fitting hole 109 is slightly smaller than the outer diameter of the pin 35. When the pin 35 is fitted in the pin fitting hole 109 as shown in FIG. Each dimensional relationship is set so as to be in a state. The rising wall 106 of the yoke 101 is formed with a relatively small diameter so as not to be pressed into the shaft through hole 46 of the coil bobbin 42. Or the structure which does not comprise the standing wall 106 may be sufficient. Further, the protrusion 49 on the inner peripheral surface of the shaft through hole 46 described in the first embodiment or the seventh embodiment is not provided.

  Therefore, by pushing the coil bobbin 42 into the yoke 101 with an appropriate load, the pin 35 on the second flange 48 is pressed into the pin fitting hole 109 of the end wall portion 103 of the yoke 101 as shown in FIG. Mating. As a result, the yoke 101 is coupled to the coil bobbin 42.

  In this embodiment, since the coil bobbin 42 and the yoke 101 are coupled to each other at a plurality of locations, the dropout due to vibration or the like is less likely to occur. Further, the pin 35 of the second flange 48 is for positioning the coil assembly 13 with respect to the body 3 as described above, and the yoke 101 is fixedly held by using this positioning pin 35. Becomes simple. In addition to the positioning pins 35, it is possible to add pins for coupling to the yoke 101.

[Other Modifications of Coil Assembly 13]
In the first embodiment and the like, the protrusion 49 protruding radially inward is formed on the inner periphery of the shaft through hole 46 of the coil bobbin 42. Instead of the protrusion 49 on the coil bobbin 42 side, The first rising wall 54, the second rising wall 64, or the rising wall 106 may be formed with a protrusion protruding outward in the radial direction. It is desirable to provide a plurality of, for example, three protrusions.

  In the fourth, fifth, tenth and eleventh embodiments, the protruding portions 71, 72, 111 and 112 protruding outward in the radial direction are formed on the outer peripheral edges of the flanges 47 and 48 of the coil bobbin 42. However, instead of the protrusions 71, 72, 111, and 112 on the coil bobbin 42 side, protrusions protruding radially inward are provided on the side wall 52 of the first yoke 43 or the side wall 104 of the yoke 101. You may make it form. It is desirable to provide a plurality of, for example, three protrusions.

[Mode of coil assembly]
As a mode of the coil assembly based on the embodiment described above, for example, the mode described below can be considered.

  In one aspect, the coil assembly of the present invention includes a coil bobbin having a shaft portion around which a coil is wound and a shaft through-hole penetrating the shaft portion in the axial direction, an end wall portion, and the end wall. One end of the coil bobbin that has a side wall that stands up from the portion is opened and accommodates the coil bobbin. And a second yoke individually connected to the coil bobbin.

  In a preferred aspect of the present invention, the first yoke or the second yoke is coupled to the coil bobbin at the axial end of the coil bobbin.

  In a preferred aspect of the present invention, the end wall portion of the first yoke is formed with a through-hole having a first rising wall rising toward the inside of the first yoke at an opening edge, The first rising wall is fitted to the end of the shaft through hole, and the first yoke and the coil bobbin are coupled.

  In a preferred aspect of the present invention, the second yoke is formed with a through hole having a second rising wall rising toward the inside of the first yoke at an opening edge, and the second rising wall is formed. Is fitted to the end of the shaft through hole, and the second yoke and the coil bobbin are coupled.

  In a further preferred aspect of the present invention, the first rising wall, the second rising wall, or the outer peripheral surface of the first rising wall or the inner peripheral surface of the shaft through hole is provided with a protruding portion that protrudes in the radial direction. The first yoke or the second yoke and the coil bobbin are coupled in a press-fit state by the portion.

  In a preferred aspect of the present invention, the protrusion is provided on the inner peripheral surface of the shaft through hole, and the protrusion continuously extends in the axial direction over the entire length of the shaft through hole. Is formed.

  In a preferred aspect of the present invention, projecting pins (pins 35, 81) projecting along the axial direction are formed at the end of the coil bobbin, and the first yoke or the second yoke is provided on the end of the coil bobbin. A pin fitting hole corresponding to the protruding pin is formed through, and the protruding pin is fitted into the pin fitting hole in a press-fit state so that the first yoke or the second yoke and the coil bobbin are Are combined.

  In a preferred aspect of the present invention, a flange projecting in the radial direction is formed on the shaft portion, and an outer peripheral end of the flange is fitted into an inner peripheral surface of the side wall portion of the first yoke in a press-fit state. In combination, the first yoke and the coil bobbin are coupled.

  In a preferred aspect of the present invention, the outer peripheral end of the flange or the inner peripheral surface of the side wall is provided with a protrusion protruding in the radial direction.

  In a preferred embodiment of the present invention, flanges protruding in the radial direction are formed at both ends of the shaft part, and the diameters of the two flanges are different from each other. The outer peripheral end of the first yoke is fitted into the inner peripheral surface of the side wall portion of the first yoke in a press-fit state, and the first yoke and the coil bobbin are coupled.

  In another aspect of the present invention, the coil assembly includes a shaft bobbin around which a coil is wound, a coil bobbin having a shaft through-hole penetrating the shaft in the axial direction, and an end wall portion. And a yoke having a side wall portion standing up from the end wall portion and having one end opened, and a yoke that accommodates the coil bobbin. The yoke is coupled to the coil bobbin.

  In a preferred aspect of the present invention, a through hole having a rising wall rising toward the inside of the yoke at an opening edge is formed in the end wall portion of the yoke, and the rising wall is formed on the shaft. The yoke and the coil bobbin are coupled to each other through the end of the through hole.

  In a preferred aspect of the present invention, the outer peripheral surface of the rising wall or the inner peripheral surface of the shaft through hole is provided with a projecting portion projecting in the radial direction, and the projecting portion allows the two yokes, the coil bobbin, Is connected to the press-fit state.

  In a preferred aspect of the present invention, the protrusion is provided on the inner peripheral surface of the shaft through hole, and the protrusion is formed continuously in the axial direction over the entire length of the shaft through hole. ing.

  In a preferred aspect of the present invention, a projecting pin projecting along the axial direction is formed at the end of the coil bobbin, and a pin fitting hole corresponding to the projecting pin passes through the yoke. The protruding pin is fitted into the pin fitting hole in a press-fit state, and the yoke and the coil bobbin are coupled.

  In a preferred aspect of the present invention, a flange projecting in the radial direction is formed on the shaft portion, and an outer peripheral end of the flange is press-fitted into an inner peripheral surface of the side wall portion of the yoke. The yoke and the coil bobbin are coupled together.

  In a preferred aspect of the present invention, the outer peripheral end of the flange or the inner peripheral surface of the side wall is provided with a protrusion protruding in the radial direction.

[Mode of brake control device]
The present invention further relates to a brake control device including a coil assembly. In a preferred aspect of the present invention, the brake control device includes a hydraulic block in which a fluid passage serving as a part of a brake pipe is formed, a valve body inserted into a valve insertion hole of the block, and the valve body. A solenoid valve for controlling the flow rate of the fluid passage, including a coil assembly for driving, a circuit board on which an electric circuit for driving the solenoid valve is formed, and the coil assembly and the circuit board are accommodated. A coil bobbin having a shaft portion around which the coil is wound, and a cylindrical shape in which one end having an end wall portion and a side wall portion standing up from the end wall portion is opened. The coil bobbin is housed and disposed at one end of the coil bobbin along a first yoke coupled to the coil bobbin and an opening end of the first yoke. And it includes a second yoke coupled individually to said coil bobbin, projecting in the axial direction of the coil bobbin from the end of the coil bobbin, a terminal which is fixedly supported on the circuit board, the.

  In another preferred embodiment, the brake control device includes a hydraulic block in which a fluid passage serving as a part of a brake pipe is formed, a valve body inserted into a valve insertion hole of the block, and the valve body A solenoid valve for controlling the flow rate of the fluid passage, a circuit board on which an electric circuit for driving the solenoid valve is formed, and the coil assembly and the circuit board are accommodated. A coil bobbin having a shaft portion around which the coil is wound, and a cylindrical shape having one end opened having an end wall portion and a side wall portion standing up from the end wall portion. None, accommodates the coil bobbin, protrudes in the axial direction of the coil bobbin from the yoke coupled to the coil bobbin and the end of the coil bobbin, and And it includes a terminal which is fixed and supported on the substrate, the.

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic block, 2 ... Case, 3 ... Body, 4 ... Cover, 11 ... Solenoid valve, 12 ... Valve body, 13 ... Coil assembly, 15 ... Bottom wall, 17 ... Circuit board, 19 ... Connector, 23 ... Terminal guide, 24 ... Terminal guide hole, 25 ... Opening, 26 ... Coil support hook, 31 ... Terminal, 31a ... Winding connection part, 32 ... Terminal support base, 33 ... Concave groove, 34 ... Opening, 35 ... Pin (Projecting pin), 41 ... coil, 42 ... coil bobbin, 43 ... first yoke, 44 ... second yoke, 45 ... shaft portion, 46 ... shaft through hole, 47 ... first flange, 48 ... second flange, 49 ... Projection part 51 ... End wall part 52 ... Side wall part 52a ... Tapered surface 53 ... Through hole 54 ... First rising wall 61 ... Notch part 62 ... Pin fitting hole 63 ... Through hole 64 ... Second rising wall, 71 ... projection, 72 ... projection, DESCRIPTION OF SYMBOLS 1 ... Pin (projection pin), 83 ... Pin fitting hole, 101 ... York, 103 ... End wall part, 104 ... Side wall part, 104a ... Tapered surface, 105 ... Through-hole, 106 ... Standing wall, 108 ... Opening part, 109 ... Pin fitting hole, 111 ... Projection, 112 ... Projection

Claims (19)

A coil bobbin having a shaft portion around which the coil is wound and having a shaft through hole penetrating the shaft portion in the axial direction;
A cylindrical shape in which one end having an end wall portion and a side wall portion standing up from the end wall portion is opened, the coil bobbin is accommodated, and a first yoke coupled to the coil bobbin;
A second yoke disposed at one end of the coil bobbin along the open end of the first yoke and individually coupled to the coil bobbin;
A coil assembly comprising:   The coil assembly according to claim 1, wherein the first yoke or the second yoke is coupled to the coil bobbin at an axial end of the coil bobbin. A through hole is formed in the end wall portion of the first yoke, the first rising wall rising toward the inner side of the first yoke at the opening edge,
2. The coil assembly according to claim 1, wherein the first rising wall is fitted to an end portion of the shaft through hole, and the first yoke and the coil bobbin are coupled to each other. The second yoke has a through hole provided with an opening edge having a second rising wall rising toward the inside of the first yoke,
2. The coil assembly according to claim 1, wherein the second rising wall is fitted to an end portion of the shaft through hole, and the second yoke and the coil bobbin are coupled to each other. Protruding portions projecting in the radial direction are provided on the outer peripheral surface of the first rising wall or the second rising wall or the inner peripheral surface of the shaft through-hole,
5. The coil assembly according to claim 3, wherein the first yoke or the second yoke and the coil bobbin are connected in a press-fitted state by the protrusions. 6. The protrusion is provided on the inner peripheral surface of the shaft through hole,
The coil assembly according to claim 5, wherein the protrusion is formed continuously in the axial direction over the entire length of the shaft through hole. A projecting pin projecting along the axial direction is formed at the end of the coil bobbin,
A pin fitting hole corresponding to the protruding pin is formed through the first yoke or the second yoke,
3. The coil assembly according to claim 2, wherein the protruding pin is fitted into the pin fitting hole in a press-fit state, and the first yoke or the second yoke and the coil bobbin are coupled. . A flange protruding in the radial direction is formed on the shaft portion,
The outer periphery of the flange is fitted into the inner peripheral surface of the side wall portion of the first yoke in a press-fit state, and the first yoke and the coil bobbin are coupled to each other. Coil assembly.   The coil assembly according to claim 8, further comprising a protruding portion that protrudes in a radial direction on an outer peripheral end of the flange or an inner peripheral surface of the side wall portion. The flanges protruding in the radial direction are formed at both ends of the shaft part, and the diameters of the two flanges are different from each other.
An outer peripheral end of a relatively large-diameter flange is press-fitted into an inner peripheral surface of the side wall portion of the first yoke, and the first yoke and the coil bobbin are coupled to each other. The coil assembly according to claim 1. A coil bobbin having a shaft portion around which the coil is wound and having a shaft through hole penetrating the shaft portion in the axial direction;
A cylindrical shape in which one end having an end wall portion and a side wall portion standing from the end wall portion is opened, and a yoke that accommodates the coil bobbin;
A coil assembly, wherein the yoke is coupled to the coil bobbin. In the end wall portion of the yoke, a through-hole having a rising wall rising toward the inside of the yoke at the opening edge is formed,
The coil assembly according to claim 11, wherein the rising wall is fitted to an end of the shaft through hole, and the yoke and the coil bobbin are coupled to each other. Protruding portions projecting radially are provided on the outer peripheral surface of the rising wall or the inner peripheral surface of the shaft through hole,
The coil assembly according to claim 12, wherein the two yokes and the coil bobbin are coupled in a press-fitted state by the protrusions. The protrusion is provided on the inner peripheral surface of the shaft through hole,
The coil assembly according to claim 13, wherein the protrusion is formed continuously in the axial direction over the entire length of the shaft through hole. A projecting pin projecting along the axial direction is formed at the end of the coil bobbin,
A pin fitting hole corresponding to the protruding pin is formed through the yoke,
The coil assembly according to claim 11, wherein the protruding pin is fitted into the pin fitting hole in a press-fitted state, and the yoke and the coil bobbin are coupled to each other. A flange protruding in the radial direction is formed on the shaft portion,
The coil assembly according to claim 11, wherein an outer peripheral end of the flange is press-fitted into an inner peripheral surface of the side wall portion of the yoke and the yoke and the coil bobbin are coupled. .   The coil assembly according to claim 16, further comprising a radially projecting protrusion on an outer peripheral end of the flange or an inner peripheral surface of the side wall. A hydraulic block in which a fluid passage is formed as a part of the brake pipe;
A solenoid valve that includes a valve body inserted into the valve insertion hole of the block and a coil assembly that drives the valve body, and controls a flow rate of the fluid passage;
A circuit board on which an electric circuit for driving the solenoid valve is formed;
A case in which the coil assembly and the circuit board are accommodated;
A brake control device comprising:
The coil assembly is
A coil bobbin having a shaft around which a coil is wound;
A cylindrical shape in which one end having an end wall portion and a side wall portion standing up from the end wall portion is opened, the coil bobbin is accommodated, and a first yoke coupled to the coil bobbin;
A second yoke disposed at one end of the coil bobbin along the open end of the first yoke and individually coupled to the coil bobbin;
A terminal protruding from the end of the coil bobbin in the axial direction of the coil bobbin and fixedly supported on the circuit board;
A brake control device comprising: A hydraulic block in which a fluid passage is formed as a part of the brake pipe;
A solenoid valve that includes a valve body inserted into the valve insertion hole of the block and a coil assembly that drives the valve body, and controls a flow rate of the fluid passage;
A circuit board on which an electric circuit for driving the solenoid valve is formed;
A case in which the coil assembly and the circuit board are accommodated;
A brake control device comprising:
The coil assembly is
A coil bobbin having a shaft around which a coil is wound;
A cylindrical shape in which one end having an end wall portion and a side wall portion that stands up from the end wall portion is opened, accommodates the coil bobbin, and a yoke coupled to the coil bobbin;
A terminal protruding from the end of the coil bobbin in the axial direction of the coil bobbin and fixedly supported on the circuit board;
A brake control device comprising:

Images