JP4957191B2 - Motor driver and manufacturing method thereof - Google Patents

Description

  The present invention relates to a motor driver that is provided in a valve timing adjusting device (hereinafter referred to as an “electric valve timing adjusting device”) that adjusts the valve timing of an internal combustion engine using the rotation of an electric motor, and drives the electric motor to be energized, and its manufacture. Regarding the method.

2. Description of the Related Art Conventionally, there is known an electric valve timing adjusting device in which a motor driver is fixed to and integrated with an electric motor (see, for example, Patent Document 1). In the motor driver of such an integrated electric valve timing adjusting device, a technique is adopted in which a circuit board on which an electric circuit element for energizing a motor is mounted is bonded to a board base fixed to the electric motor.
JP 2006-37837 A

  In the above technique, an electric circuit element that requires positional accuracy in a state where the substrate base is fixed to the electric motor, such as a rotation detecting element that detects the rotation of the electric motor, may be mounted on the circuit board. . In such a case, for example, after the circuit board is bonded to the board base, the electric circuit element is positioned and mounted on the circuit board, thereby ensuring the positional accuracy of the electric circuit element. However, since the circuit board bonding position with respect to the board base is likely to vary, in order to position and mount the electric circuit element on the circuit board after bonding, the mounting position of the electric circuit element for each product is determined by image recognition or the like. There is a problem that a complicated operation such as confirmation is required and productivity is lowered.

  The present invention has been made in view of these problems, and an object thereof is to increase the productivity of the motor driver while ensuring the positional accuracy of the electric circuit elements in the motor driver of the electric valve timing adjusting device. is there.

The invention according to claim 1 is a motor driver that is provided in a valve timing adjusting device that adjusts a valve timing of an internal combustion engine by using rotation of an electric motor, and that drives the electric motor to be energized. A circuit board on which an electric circuit element for energization is positioned and mounted, a board base fixed to the electric motor, and a projecting body projecting from the board base are configured by four sides of the circuit board. The side edge portion has a first side portion and a second side portion intersecting each other as side edge portions, the substrate base has a holding surface for holding the substrate surface of the circuit board, and the protrusion is held The protrusion protrudes from the surface in the thickness direction of the circuit board, and the protrusion is provided with at least one or more first protrusions that contact the first side and second protrusions that contact the second side. One protrusion is turned around the first side. Contact from the side of the substrate, the second protruding member is under a state in contact with the side of the circuit board to the second side portion, the circuit board is bonded onto the substrate base, and the holding surface and the projecting member A recess is provided in the substrate base along the boundary portion of the substrate, and the recess opens in the holding surface .

  Therefore, according to the first aspect of the present invention, the circuit board can be easily mounted on the board base by bringing the side edge of the circuit board on which the electric circuit element is positioned and mounted into contact with the protruding body protruding from the board base. Can be positioned and bonded. Therefore, according to the first aspect of the present invention, the positional accuracy of the electric circuit element in a state where the substrate base is fixed to the electric motor can be ensured by a relatively simple operation. Sexuality is enhanced.

The invention described in claims 2 and 7 includes a rotation detection element that is mounted on a circuit board as an electric circuit element and detects the rotation of the electric motor. Such a rotation detection element is required to have sufficient positional accuracy, but the required accuracy can be ensured by using a protrusion.

  The electric circuit element may be an element other than the rotation detection element as long as it is positioned and mounted on the circuit board.

The circuit board has a first side and a second side that intersect with each other as side edges, and as a projecting body, the first projecting body that abuts on the first side and the second side abuts. At least one second projecting body is provided. According to this, the side edges of the circuit board can be brought into contact with the respective protrusions on both sides of the corners formed at the intersections of the respective sides, so that the circuit board is circumferentially bonded to the board base. It is possible to suppress the position shift.

According to invention of Claim 3 , a 1st protrusion is provided in two places along a 1st edge part, respectively, and a 2nd protrusion is provided in one place spaced apart from a 1st edge part. According to this, for the circuit board that is supported at two points on the substrate base by the contact of the first side part to the two first protrusions, the second side part is brought into contact with one second protrusion. The displacement of the circuit board in the circumferential direction can be reliably suppressed.

According to invention of Claim 4 , a 1st protrusion is provided in the both ends vicinity of a 1st edge part, respectively, and a 2nd protrusion is an edge of the side spaced apart from a 1st edge part in a 2nd edge part. It is provided near the part. According to this, the effect of suppressing the circumferential displacement of the circuit board is improved.

According to invention of Claim 5 , a circuit board has the 1st edge part and 2nd edge part which mutually cross | intersect as a side edge part, and a protrusion is a bending along a 1st edge part and a 2nd edge part. It has a shape and abuts both sides. According to this, the side edges of the circuit board can be brought into contact with the same bent-shaped projecting body on both sides of the corner formed by each side at the intersection, so that the circuit board can be bonded to the board base. Can be prevented from being displaced in the circumferential direction. Further, in the case of a bent-shaped protrusion, it can be formed relatively large, so that the strength of the protrusion can be increased and damage to the protrusion due to contact of the circuit board can be prevented.

According to the sixth aspect of the present invention, the first side and the second side cross each other at a substantially right angle. According to this, for example, a general circuit board having a rectangular shape in plan view can be bonded to the base in a state in which the positional deviation in the circumferential direction is suppressed by positioning the board with respect to the board base.

The invention according to claim 7 is mounted as a plurality of electrical circuit elements at a plurality of locations along the rotation direction of the electric motor on the board surface of the circuit board substantially perpendicular to the rotation axis of the electric motor, and detects a plurality of rotations of the electric motor. A rotation detection element is provided. Each such rotation detection element has the first and second side portions of the circuit board abutting against the first and second protrusions or the bent protrusions, so that the electric motor also has a circumferential direction. Even in the rotation direction, positional deviation is suppressed. Therefore, the rotation detection accuracy by each rotation detection element is improved.

The board base has a holding surface that holds the board surface of the circuit board, and the projecting body protrudes from the holding surface in the thickness direction of the circuit board, and from the side of the circuit board to the side edge of the circuit board. Abut. Since the formation of the substrate base in which the protruding body protrudes from the holding surface in this manner becomes relatively easy by using a molding process or the like, productivity is increased.

A recess is provided in the substrate base along the boundary between the protrusion and the holding surface. According to this, in the circuit board in which the substrate surface is held by the holding surface, the edge formed by the side edge portion of the circuit board is difficult to ride on the boundary portion between the protruding body and the holding surface. It can be made to contact.

Further , the recess opens to the holding surface. Since the formation of the substrate base having the holding surface in which the concave portion is opened and the protruding body protrudes as described above becomes relatively easy by using a molding process or the like, productivity is increased.

According to the eighth aspect of the present invention, a part of the opening of the recess in the holding surface is covered with the circuit board so as to face the substrate surface, and the remaining part of the opening is exposed on the side of the circuit board. According to this, for example, when the substrate base is formed by molding, it is possible to increase the strength by increasing the portion where the concave portion is molded in the molding die as much as possible. It is possible to prevent a decrease in productivity.

According to the ninth aspect of the present invention, the projecting body has a flat contact surface that contacts the side edge of the circuit board, and is formed to have a smaller width toward the contact surface. According to this, the contact area between the projecting body and the circuit board is made as small as possible to accurately position the circuit board, and at the same time, the strength of the projecting body is increased to prevent damage to the projecting body due to the contact of the circuit board. Can be prevented.

A method of manufacturing a motor driver that is provided in a valve timing adjustment device that adjusts valve timing of an internal combustion engine using rotation of an electric motor and that drives an electric motor to energize, the substrate base having a protrusion formed thereon is provided. Inclined so that the part where the protrusion is formed is at a lower position than the other part, and the electric circuit element for energizing the electric motor is positioned and the side edge of the circuit board on which the circuit board is mounted contacts the protrusion In this state, the circuit board is bonded onto the board base.

Therefore , on the substrate base inclined so that the projecting portion is formed at a lower position than the other portions, the side edge portion of the circuit board contacting the projecting body is pressed against the projecting body by the gravitational action. Therefore, the circuit board to be bonded onto the board base is accurately positioned with respect to the board base in a state where the side edge is pressed against the protrusion.

It is possible to secure a positional accuracy of the electric circuit elements by a relatively simple operation of the contact to the base plate base of the inclined and the circuit board protruding body, a motor driver productivity is enhanced.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment.

(First embodiment)
FIG. 2 shows the electric valve timing adjusting device 1 according to the first embodiment of the present invention. The electric valve timing adjusting device 1 is mounted on a vehicle and adjusts the valve timing of an intake valve or an exhaust valve of an internal combustion engine using rotation of an electric motor 12.

  First, the electric unit 10 of the electric valve timing adjusting device 1 shown in FIG. 2 will be described. The electric unit 10 includes an electric motor 12 and a motor driver 60.

  The electric motor 12 is, for example, a brushless motor, and includes a motor case 13, a motor shaft 14, a motor coil (not shown), and the like. The motor case 13 is fixed to the internal combustion engine via a stay. The motor case 13 supports the motor shaft 14 so as to be rotatable forward and backward, and houses a plurality of motor coils. In the electric motor 12, when the rotating magnetic field in the forward direction that is clockwise in FIG. 3 is formed by energizing each motor coil, the motor shaft 14 is rotationally driven in the forward direction. On the other hand, when a rotating magnetic field in the reverse direction, which is counterclockwise in FIG. 3, is formed by energizing each motor coil, the motor shaft 14 is rotationally driven in the reverse direction.

  The motor driver 60 includes a driver case 62, a circuit board 64, an electric circuit element 66, and the like. The driver case 62 is formed in a hollow shape that accommodates the circuit board 64 by assembling the resin connector 71 and the board cover 72 to the board base 70. The board base 70 that holds the circuit board 64 in the driver case 62 is fixed to the motor case 13. A plurality of electric circuit elements 66 for controlling or energizing the electric motor 12 are mounted on the circuit board 64.

  Next, the phase adjustment unit 20 of the electric valve timing adjustment device 1 shown in FIG. 2 will be described. The phase adjustment unit 20 includes a driving side rotating body 22, a driven side rotating body 24, a differential gear mechanism 30, and a link mechanism 50.

  The drive-side rotator 22 is a timing sprocket around which a timing chain is wound between the crankshaft of the internal combustion engine. When the output torque of the crankshaft is input to the drive-side rotator 22, the drive-side rotator 22 rotates in the clockwise direction in FIGS. 4 and 5 while maintaining a relative phase with the crankshaft in conjunction with the crankshaft. The driven-side rotator 24 is coaxially fixed to the camshaft 2 of the internal combustion engine, and rotates in the clockwise direction in FIGS.

  As shown in FIGS. 2 and 3, the differential gear mechanism 30 includes a sun gear 31, a planet carrier 32, a planet gear 33, a transmission rotating body 34, and the like. The sun gear 31 formed of an internal gear is screwed coaxially to the drive side rotator 22 and rotates integrally with the drive side rotator 22 by transmission of the output torque of the crankshaft. The planet carrier 32 is connected to the motor shaft 14 via a joint 35 and rotates integrally with the motor shaft 14. The planetary carrier 32 forms an eccentric portion 36 by a cylindrical outer peripheral surface portion that is eccentric with respect to the driving side rotating body 22. The planetary gear 33 made of an external gear is fitted to the eccentric portion 36 via the bearing 37 and is arranged eccentrically with respect to the sun gear 31. The planetary gear 33 meshes with the sun gear 31 from the inner peripheral side, and performs a planetary motion according to the relative rotation of the motor shaft 14 with respect to the drive side rotating body 22. The transmission rotating body 34 is concentrically fitted to the outer peripheral side of the driven side rotating body 24. The transmission rotating body 34 is provided with a plurality of engagement holes 38 arranged at equal intervals in the rotation direction. The planetary gear 33 is provided with a plurality of engagement protrusions 39 protruding into the engagement holes 38. Then, when each of the engagement protrusions 39 engages with the engagement hole 38, the rotation motion of the planetary gear 33 is extracted and converted into the rotation motion of the transmission rotating body 34.

  As shown in FIGS. 4 and 5, the link mechanism 50 includes links 52 and 53, a guide portion 54, a movable body 56, and the like. In FIGS. 4 and 5, hatching representing a cross section is omitted for easy understanding of the description. The first link 52 is connected to the drive-side rotator 22 by a pair. The second link 53 is connected to the driven-side rotating body 24 by a turning pair and is connected to the first link 52 by a turning pair via the movable body 56. As shown in FIGS. 2 and 5, the guide portion 54 is formed by a portion including an end surface on the opposite side to the planetary gear 33 in the transmission rotating body 34. A guide groove 58 in which the movable body 56 is slidably fitted is formed in the guide portion 54. The guide groove 58 is formed in a spiral groove shape whose distance from the rotation center of the guide portion 54 changes in the longitudinal direction.

  In the phase adjustment unit 20 having such a configuration, when the motor shaft 14 does not rotate relative to the driving side rotating body 22, the planetary gear 33 does not make a planetary motion and is integrated with the driving side rotating body 22 and the transmission rotating body 34. Rotate. As a result, the movable body 56 is not guided in the guide groove 58, and the relative positional relationship between the links 52 and 53 does not change, so that the relative phase between the driving side rotating body 22 and the driven side rotating body 24, and hence the valve timing, is increased. Retained. On the other hand, when the motor shaft 14 is driven to rotate relative to the drive-side rotator 22 in the forward rotation direction, the transmission rotator 34 is moved counterclockwise in FIG. Rotate relative to direction. As a result, the movable body 56 is guided in the guide groove 58 and the relative positional relationship between the links 52 and 53 changes, so that the driven side rotating body 24 is relative to the driving side rotating body 22 in the clockwise direction in FIG. Since it rotates, the valve timing is advanced. On the other hand, when the motor shaft 14 is relatively rotated in the reverse rotation direction with respect to the drive-side rotator 22, the valve timing is retarded by the principle opposite to that in the relative rotation driving in the forward rotation direction.

  Next, the configuration of the motor driver 60 that is a characteristic part of the first embodiment will be described in more detail.

  As shown in FIGS. 1 and 6, the circuit board 64 of the motor driver 60 is formed in a rectangular flat plate shape in plan view in the thickness direction, and is flat and substantially perpendicular to the rotation axis O of the motor shaft 14 of the electric motor 12. Planar substrate surfaces 80 and 82 are provided. A rotation detection element 66 a as an electric circuit element 66 is mounted on one board surface 80 of the circuit board 64. Here, the rotation detecting elements 66a are arranged at a plurality of locations (for example, three locations as shown in FIG. 6) along the rotation direction of the motor shaft 14, and are attached to the rotor portion 75 of the motor shaft 14 as shown in FIG. The circular magnet 76 is opposed to the circular magnet 76 through a through hole 74 that penetrates the substrate base 70. Each rotation detection element 66a is, for example, a Hall element, and detects the rotation angle or the rotation speed of the motor shaft 14 by sensing the magnetic field generated by the magnet 76. A plurality of electric circuit elements 66 other than the rotation detecting element 66a are mounted on the other board surface 82 of the circuit board 64.

  As shown in FIGS. 6 and 7, in the substrate base 70, the first protrusion protrudes from the flat holding surface 84 which is bonded to the substrate surface 80 on the rotation detection element 66 a side of the circuit substrate 64 and holds the substrate surface 80. A body 90 is formed. Here, the first projecting body 90 includes two locations along the first side portion 92a among the four side portions 92a, 92b, 92c, and 92d constituting the side edge portion of the circuit board 64, specifically, the first side portion. It is provided in the vicinity of both ends of 92a. Each of these first protrusions 90 protrudes from the holding surface 84 in the thickness direction of the circuit board 64, and abuts against the first side portion 92 a from the side of the circuit board 64.

  As shown in FIGS. 1 and 6, a second projecting body 94 is further formed on the holding surface 84. Here, the second projecting body 94 is one place separated from the first side portion 92a along the second side portion 92b intersecting the first side portion 92a at a substantially right angle on the circuit board 64, specifically, the second side. The portion 92b is provided in the vicinity of the end portion on the side away from the first side portion 92a. The second projecting body 94 projects from the holding surface 84 in the thickness direction of the circuit board 64, and contacts the second side 92 b from the side of the circuit board 64.

  As shown in FIGS. 1, 6, and 7, a third protrusion 96 is further formed on the holding surface 84. The third projecting body 96 has a rectangular frame shape that extends on the outer peripheral side of the circuit board 64 along the four sides 92 a to 92 d, and projects from the holding surface 84 in the plate thickness direction of the circuit board 64. One protrusion 90 is reinforced from the side opposite to the first side 92a and the second protrusion 94 is reinforced from the side opposite to the second side 92b. As shown in FIG. 8, each of the first protrusions 90 and the second protrusions 94 in the plan view in the plate thickness direction of the circuit board 64 has contact surfaces 91 with the circuit board 64 from the third protrusion 96 side. It has a trapezoidal shape that becomes narrower toward the 95 side, and the contact surfaces 91 and 95 are flat.

  As shown in FIGS. 1, 6, and 7, the holding surface 84 is further formed with a recess 98. Here, the recesses 98 are respectively provided at three locations along the boundary between each first protrusion 90 and the holding surface 84 and the boundary between the second protrusion 94 and the holding surface 84. Each of these recesses 98 opens to the holding surface 84 and has a groove shape extending along the first protrusion 90 or the second protrusion 94. As shown in FIGS. 1, 7, and 8, in this embodiment, a part 98a of each recess 98 is covered with the circuit board 64 so as to face the substrate surface 80, while the remaining parts 98b and 98c of each recess 98 are covered. Is exposed on the side of the circuit board 64.

  Next, a method for manufacturing the motor driver 60 described above will be described in detail.

(Mounting process)
As shown in FIG. 9, in the mounting process, a plurality of electric circuit elements 66 including the rotation detecting element 66 a are positioned and mounted on the board surfaces 80 and 82 of the circuit board 64.

(Molding process)
As shown in FIG. 10, in the forming step, molten metal 100 such as aluminum is poured into the forming mold 102, and the substrate base 70 in which the recess 98 is formed is die-cast together with the protrusions 90, 94, 96. At this time, in the molding of the substrate base 70 in which the protrusions 90, 94, 96 protrude from the holding surface 84 and the recess 98 opens in the holding surface 84, the mold release direction of the substrate base 70 from the molding die 102 is set to the holding surface 84. The mold release is facilitated only by setting in a substantially vertical direction. Further, the concave portion 98 has a size obtained by adding the remaining portions 98b and 98c to a minimum portion 98a necessary for abutting between the side portions 92a and 92b, which will be described later, and the protrusions 90 and 94. The protrusion 104 of the mold 102 for molding 98 can be made as large as possible to increase its strength.

  In addition, about the implementation order of a shaping | molding process and a mounting process, you may mutually follow and may be substantially simultaneous.

(Adhesion process)
As shown in FIGS. 11 and 12, in the bonding process, first, an adhesive 110 made of a thermosetting resin is applied substantially uniformly to the holding surface 84 of the substrate base 70 obtained by the molding process. In FIGS. 11 and 12, the layer of the adhesive 110 is emphasized.

  Next, the first side 92a and the second side 92b of the circuit board 64 on which the electric circuit element 66 is mounted by the mounting process are brought into contact with the first protrusion 90 and the second protrusion 94, respectively. Then, the circuit board 64 is placed on the holding surface 84 to which the adhesive 110 is applied. At this time, the edge 112 formed by the side portions 92a and 92b and the substrate surface 80 in the circuit board 64 is the presence of the recess 98 provided along the boundary between the protrusions 90 and 94 and the holding surface 84, particularly the part 98a. Therefore, it does not ride on the boundary portion. Therefore, the contact between the side portions 92a and 92b and the protrusions 90 and 94 is ensured.

  Subsequently, the substrate base 70 on which the circuit board 64 is placed is placed on the tilt jig 114 while maintaining the contact between the side portions 92a and 92b and the protrusions 90 and 94 as shown in FIGS. Set to. Thereby, the substrate base 70 is positioned so that the portion where the first protrusion 90 closer to the second side 92b is located is lower than the portion where the other first protrusion 90 and second protrusion 94 are formed. And it is made to incline so that the formation part of the said other 1st protrusion 90 and the 2nd protrusion 94 may become a lower position than the remaining other part. Thereafter, by heating and curing the adhesive 110, the substrate surface 80 is held by the holding surface 84 under the state in which the side portions 92a and 92b of the circuit board 64 subjected to the gravitational action are pressed against the protrusions 90 and 94. Therefore, the circuit board 64 and its mounting element 66 are accurately positioned with respect to the board base 70. In particular, with respect to the circuit board 64 and the mounting element 66 that are supported at two points on the board base 70 by the contact of the first side 92a with each first projecting body 90, the corners intersect with the first side 92a. Since the second side portion 92b forming 116 (see FIG. 6) is in contact with the second projecting body 94, the effect of suppressing the circumferential displacement can be enjoyed.

  In the bonding process, after the substrate base 70 is set on the tilt jig 114, the circuit board 64 may be mounted on the substrate base 70 and bonded thereto. In this case, the application of the adhesive 110 to the circuit board 64 may be performed before the board base 70 is set on the tilt jig 114, or after the setting, the circuit board 64 is placed on the board base 70. You may carry out before mounting.

(Fixing process)
In the fixing step, first, the substrate base 70 to which the circuit board 64 is bonded in the bonding step is fixed to the motor case 13 of the electric motor 12 as shown in FIG. As a result, among the mounting elements 66 of the circuit board 64 positioned with respect to the board base 70 by the bonding process, in particular, the three rotation detecting elements 66a arranged along the rotation direction of the motor shaft 14 of the electric motor 12 are the electric motors. The 12 magnets 76 face each other at precise positions. Therefore, the rotation detection by each rotation detection element 66a can be made highly accurate.

  After the board base 70 is fixed to the motor case 13, a predetermined electric circuit element 66 is electrically connected to the terminals of the electric motor 12, and the resin connector 71 and the board cover 72 are fixed to the board base 70 and the driver case. By forming 62, the motor driver 60 is completed.

  As described above, in the first embodiment, the substrate base 70 is tilted and the side portions 92a and 92b of the circuit board 64 are brought into contact with the protrusions 90 and 94 of the base 70. Each electric circuit element 66 can be accurately positioned. Therefore, according to the first embodiment, both improvement in productivity of the motor driver 60 and securing of positional accuracy of each electric circuit element 66 in a state where the motor driver 60 is fixed to the electric motor 12 can be achieved. It can be done.

(Second embodiment)
As shown in FIG. 13, the second embodiment of the present invention is a modification of the first embodiment. In the motor driver 200 of the second embodiment, the first protrusion 210 has a shape that is long along the first side 92a of the circuit board 64, specifically, the first side 92a is separated from the second side 92b. It has a linear shape extending from the vicinity of the end on the side to the vicinity of the other end. In the motor driver 200, the second protrusion 214 has a shape that is long along the second side 92b of the circuit board 64, specifically, the second side 92b on the side away from the first side 92a. It has a linear shape extending from the vicinity of the end portion to the vicinity of the other end portion. In addition, about the recessed part 98 of 2nd Embodiment provided with the 1st and 2nd protrusions 210 and 214 of such a structure, two along the boundary of each protrusion 210,214 and the holding surface 84 of the board | substrate base 70. Is provided.

  Also in the second embodiment, the side portions 92a and 92b are brought into contact with the protrusions 210 and 214, respectively, and the circuit board 64 is bonded to the board base 70, thereby improving the productivity and the electric circuit elements. It is possible to achieve both of 66 positional accuracy. Further, since the linear first and second protrusions 210 and 214 can be formed relatively large, the strength of the protrusions 210 and 214 is increased so that the circuit board 64 is not damaged. Can be prevented.

(Third embodiment)
As shown in FIG. 14, the third embodiment of the present invention is a modification of the first embodiment. In the motor driver 300 of the third embodiment, a bent protrusion 310 is provided along the first side 92 a and the second side 92 b of the circuit board 64. Specifically, the projecting body 310 includes a first straight portion 312 extending from the vicinity of the end portion on the first side portion 92a away from the second side portion 92b to the corner portion 116, and a first side portion at the second side portion 92b. And a second linear portion 314 extending from the vicinity of the end portion on the side away from 92a to the corner portion 116. Therefore, in the plan view of the circuit board 64 in the plate thickness direction, the projecting body 310 has an L-shape in which the first straight portion 312 and the second straight portion 314 intersect at a substantially right angle. The concave portion 98 of the third embodiment including the projecting body 310 having such a configuration is formed in a single groove shape along the boundary between the projecting body 310 and the holding surface 84 of the substrate base 70.

  Also in the third embodiment, the side portions 92a and 92b are brought into contact with the same projecting body 310 and the circuit board 64 is bonded to the board base 70, thereby improving the productivity and the electric circuit elements 66. The position accuracy can be ensured at the same time. Further, since the bent protrusion 310 can be formed sufficiently large, the strength thereof can be increased and damage due to the contact of the circuit board 64 can be prevented.

(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and can be applied to various embodiments without departing from the scope of the present invention. .

  The number and position of the first projecting body 90 and the second projecting body 94 may be other than those described in the first embodiment. One of the first protrusion 90 and the second protrusion 94 may not be provided. Furthermore, the shapes of the first projecting body 90 and the second projecting body 94 other than the shapes described in the first embodiment, for example, a substantially triangular shape as shown in FIG. It may have a substantially semicircular shape as shown in FIG.

  About the extending | stretching form of the 1st protrusion 210 and the 2nd protrusion 214, forms other than the form demonstrated by 2nd embodiment may be sufficient. Moreover, about the extending | stretching form of each linear part 312 and 314 of the protrusion 310, as long as these linear parts 312 and 314 cross | intersect, forms other than description in 3rd embodiment may be sufficient.

  As for the “valve timing adjusting device” to which the present invention is applied, any valve timing can be adjusted by changing the relative phase between the crankshaft and the camshaft of the internal combustion engine using the rotation of the electric motor. A mechanism other than the phase adjustment unit 20 may be provided.

It is a schematic diagram which shows the characteristic part of the motor driver by 1st embodiment of this invention, Comprising: It corresponds to the II sectional view taken on the line of FIG. It is a block diagram which shows the electric valve timing adjustment apparatus provided with the motor driver by 1st embodiment of this invention, Comprising: It is equivalent to the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a block diagram which shows the characteristic part of the motor driver by 1st embodiment of this invention, Comprising: It corresponds to the VI-VI sectional view taken on the line of FIG. It is a schematic diagram which shows the characteristic part of the motor driver by 1st embodiment of this invention, Comprising: It corresponds to the VII-VII sectional view taken on the line of FIG. It is a schematic diagram which expands and shows the principal part of FIG. It is a schematic diagram which shows a mounting process among the manufacturing methods of the motor driver by 1st embodiment of this invention. It is a schematic diagram which shows a shaping | molding process among the manufacturing methods of the motor driver by 1st embodiment of this invention. It is a schematic diagram which shows an adhesion process among the manufacturing methods of the motor driver by 1st embodiment of this invention. It is a schematic diagram which shows an adhesion process among the manufacturing methods of the motor driver by 1st embodiment of this invention. It is a block diagram which shows the characterizing part of the motor driver by 2nd embodiment of this invention, Comprising: It corresponds to FIG. FIG. 8 is a configuration diagram illustrating a characteristic part of a motor driver according to a third embodiment of the present invention, and corresponds to FIG. 6. It is a schematic diagram which shows the modification of FIG. It is a schematic diagram which shows the modification of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric valve timing adjustment apparatus, 10 Electric unit, 12 Electric motor, 13 Motor case, 14 Motor shaft, 20 Phase adjustment unit, 60,200,300 Motor driver, 62 Driver case, 64 Circuit board, 66 Electric circuit element, 66a Rotation detection element, 70 Substrate base, 71 Resin connector, 72 Substrate cover, 74 Through hole, 76 Magnet, 80 Substrate surface, 84 Holding surface, 90, 210 First protrusion, 91, 95 Contact surface, 92a First side Part, 92b second side part, 94, 214 second projecting body, 96 third projecting body, 98 recessed part, 98a part, 98b, 98c remaining part, 100 metal hot water, 102 mold, 104 projecting part, 110 adhesive, 112 Edge, 114 Inclining jig, 116 Corner part, 310 Projection body, 312 First linear part, 314 Second straight line part, O rotation axis

Claims (9)

A motor driver that is provided in a valve timing adjustment device that adjusts the valve timing of an internal combustion engine using the rotation of an electric motor and drives the electric motor to energize,
A circuit board on which electrical circuit elements for controlling or energizing the electric motor are positioned and mounted;
A substrate base fixed to the electric motor;
A protrusion projecting from the substrate base;
With
The side edge part constituted by four side parts of the circuit board has a first side part and a second side part intersecting each other as the side edge part,
The substrate base has a holding surface that holds a substrate surface of the circuit board;
The protruding body protrudes from the holding surface in the thickness direction of the circuit board,
The projecting body is provided with at least one first projecting body that abuts on the first side part and at least one second projecting body that abuts on the second side part,
The first protrusion is in contact with the first side from the side of the circuit board, and the second protrusion is in contact with the second side from the side of the circuit board. the circuit board is bonded onto the substrate base,
A recess is provided in the substrate base along a boundary portion between the protrusion and the holding surface,
The motor driver according to claim 1, wherein the concave portion opens in the holding surface .   The motor driver according to claim 1, further comprising a rotation detection element that is mounted on the circuit board as the electric circuit element and detects rotation of the electric motor. The first protrusions are provided at two locations along the first side part, respectively.
3. The motor driver according to claim 1, wherein the second projecting body is provided at one place separated from the first side portion. The first protrusions are provided in the vicinity of both ends of the first side part,
4. The motor driver according to claim 3 , wherein the second projecting body is provided in the vicinity of an end portion of the second side portion that is separated from the first side portion. 5. Before SL projecting member, a bent shape along the first side portion and the second side portion, according to any one of claims 1-4, characterized in that contact both their sides Motor driver. Wherein the first side portion and the second side portion, a motor driver according to any one of claims 1 to 5, wherein the intersecting substantially at right angles to each other. A plurality of rotation detecting elements that are mounted as the electric circuit elements at a plurality of locations along the rotation direction of the electric motor on the board surface of the circuit board substantially perpendicular to the rotation axis of the electric motor, and detect the rotation of the electric motor. motor driver according to any one of claims 1 to 6, characterized in that it comprises. 2. A part of the opening of the concave portion on the holding surface is covered with the circuit board so as to face the substrate surface, and a remaining part of the opening is exposed on a side of the circuit board. The motor driver as described in any one of 1-7 . The protruding member has a flat surface shape of the contact surface abutting on the side edges of claims 1-8, characterized in that it is formed to be slightly higher the toward-contacting side The motor driver according to any one of the above.

Images