WO2022153606A1

WO2022153606A1 - Valve timing control mechanism

Info

Publication number: WO2022153606A1
Application number: PCT/JP2021/034937
Authority: WO
Inventors: 友宏福田
Original assignee: 日立Astemo株式会社
Priority date: 2021-01-12
Filing date: 2021-09-24
Publication date: 2022-07-21
Also published as: JP7510519B2; JPWO2022153606A1

Abstract

This valve timing control mechanism is provided with a motor for valve timing control, a circuit board having a driving circuit for driving the motor, and a case made of resin provided between the motor and the circuit board. A plurality of terminals of the motor are in electrical communication with the circuit board by being inserted through a plurality of terminal insertion holes formed in the case made of resin and a plurality of terminal-receiving holes formed in the circuit board.

Description

Valve timing control mechanism

The present invention relates to a valve timing control mechanism.

The automobile is equipped with an electric valve timing control mechanism as a mechanism that can continuously change the opening / closing timing of the intake valve according to the engine speed and load. The valve timing control mechanism is equipped with a motor that is a drive source, and the contact timing between the intake valve and the cam crest can be continuously changed by rotating the camshaft by the driving force of this motor to shift the position of the cam crest. It is a mechanism.

As a conventional technique, for example, the technique described in Patent Document 1 is known. Patent Document 1 describes a technique relating to a motor including a stator unit having an annular stator and a circuit board arranged above the stator in the axial direction. The stator of the motor described in Patent Document 1 has a stator core, an insulator, a conducting wire constituting a coil wire, and a terminal pin, and the terminal pin extends axially upward from the upper surface of the insulator and is an end of the conducting wire. It is connected to the circuit board by soldering together with the part.

JP-A-2020-88881

However, in the technique described in Patent Document 1, a conductor wire constituting a motor coil (hereinafter, also referred to as “coil wire”) is relayed between the motor and the circuit board in order to electrically connect the conductor wire to the circuit board. This terminal pin is inserted into the pin hole of the circuit board and soldered. Therefore, in order to electrically connect the coil wire to the circuit board, the work of connecting the end of the coil wire by winding it around the terminal pin and the terminal pin to which the coil wire is connected are connected to the pin hole of the circuit board. The work of inserting and soldering is required. Therefore, the assembly work of the valve timing control mechanism becomes complicated. Further, in the technique described in Patent Document 1, it is necessary to secure a space inside the valve timing control mechanism according to the length of the terminal pin which is a relay terminal, and this is the compact size of the valve timing control mechanism. It is an obstacle to the conversion.

An object of the present invention is to provide a technique capable of downsizing the valve timing control mechanism and easily assembling the valve timing control mechanism.

In order to solve the above problem, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems, one of which is a motor for valve timing control, a circuit board having a drive circuit for driving the motor, and a motor and a circuit board. It is a valve timing control mechanism including a resin housing provided between them. The plurality of terminals of the motor are electrically connected to the circuit board in a state of being inserted into the plurality of terminal insertion holes formed in the resin housing and the plurality of terminal receiving holes formed in the circuit board.

According to the present invention, the valve timing control mechanism can be miniaturized, and the valve timing control mechanism can be easily assembled.
Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is an exploded perspective view which shows the whole structure of the valve timing control mechanism which concerns on 1st Embodiment. FIG. 5 is a perspective view including a fracture surface in a state where a motor, a circuit board, and a housing are fixed to each other in the valve timing control mechanism according to the first embodiment. It is a cross-sectional view which expanded the part A of FIG. It is a perspective view which shows the structure of a motor. It is a top view which shows the arrangement state of a circuit board and a housing. It is an exploded perspective view which shows the arrangement state of a circuit board and a housing. It is a perspective view which shows the assembled state of the valve timing control mechanism which concerns on 1st Embodiment. FIG. 5 is a vertical cross-sectional view showing a state in which a motor, a circuit board, and a housing are fixed to each other in the valve timing control mechanism according to the second embodiment. It is an enlarged vertical sectional view of the part B of FIG. 9 is an enlarged vertical sectional view of a part of FIG. 9.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the present specification and drawings, elements having substantially the same function or configuration are designated by the same reference numerals, and duplicate description will be omitted.

[First Embodiment]
FIG. 1 is an exploded perspective view showing the overall configuration of the valve timing control mechanism according to the first embodiment.
In FIG. 1, the valve timing control mechanism 1 is a mechanism for controlling the opening / closing timing of an intake valve provided in an automobile engine (not shown). The valve timing control mechanism 1 includes an electronic control device 2 and a motor 3.

The electronic control device 2 controls the drive of the motor 3 based on a control command given from an automobile ECU (Electronic Control Unit) or the like. The motor 3 functions as a drive source for the valve timing control mechanism 1. The motor shaft 19 which is the output shaft of the motor 3 is connected to the speed reducer 6. As a result, the speed reducer 6 rotates according to the rotation direction and rotation speed of the motor 3. Although not shown, the speed reducer 6 is connected to a camshaft having a cam for opening and closing the intake valve, and transmits the driving force of the motor 3 to the camshaft. Although the speed reducer 6 is shown as a separate element from the valve timing control mechanism 1 in FIG. 1, the valve timing control mechanism 1 may be configured to include the speed reducer 6.

The electronic control device 2 covers a circuit board 4 having a drive circuit for driving a motor 3, a housing 5 accommodating the circuit board 4, and a circuit board 4 housed in the housing 5 so as to shield them from the outside. 7 and. The circuit board 4 and the housing 5 are fixed to each other together with the motor 3 described above by screwing or the like. Further, the housing 5 and the cover 7 are also fixed to each other by screwing or the like.

The circuit board 4 is composed of a printed wiring board and the like. A plurality of electronic components constituting the above-mentioned drive circuit are mounted on the circuit board 4. An opening hole 11 is formed in the circuit board 4. The opening hole portion 11 penetrates the circuit board 4 in the plate thickness direction. The opening hole portion 11 is formed in a circular shape in a plan view according to the shape of the bearing accommodating portion 13 of the housing 5. The inner diameter of the opening hole 11 is set to be larger than the outer diameter of the bearing accommodating portion 13. As a result, when the circuit board 4 is accommodated in the substrate accommodating portion 12 of the housing 5, the bearing accommodating portion 13 of the housing 5 can be inserted into the opening hole portion 11 of the circuit board 4. Further, the circuit board 4 is formed with a connector connecting portion 17 and a plurality of terminal receiving holes 25. In the circuit board 4, the opening hole portion 11 is formed between the connector connecting portion 17 and the plurality of terminal receiving holes 25. The connector connection portion 17 is connected to the connector portion 14 of the housing 5 by a plurality of connector pins described later.

The housing 5 is made of an electrically insulating resin. The housing 5 is formed with a substrate accommodating portion 12 accommodating the circuit board 4, a bearing accommodating portion 13 accommodating the bearing 15 of the motor 3, and a connector portion 14 for electrically connecting to the outside. .. The substrate accommodating portion 12 is a concave space surrounded by a peripheral wall 16 of the housing 5. The peripheral wall 16 is formed so as to follow the outer shape of the circuit board 4. The bearing accommodating portion 13 is formed in a circular shape in a plan view according to the shape of the bearing 15. The connector portion 14 is formed in a flat cylindrical shape according to the shape of the connector socket so that a connector socket (not shown) can be pulled out. The connector socket is provided, for example, at the end of the wiring connected to the ECU of the automobile. A plurality of connector pins (not shown) are arranged on the back side of the connector portion 14 in the insertion direction of the connector socket. The plurality of connector pins are pins for conducting the connector socket inserted into the connector portion 14 and the connector connecting portion 17 provided on the circuit board 4. The plurality of connector pins are preferably formed integrally with the housing 5 by insert molding.

FIG. 2 is a perspective view including a fracture surface in a state where the motor, the circuit board, and the housing are fixed to each other in the valve timing control mechanism according to the first embodiment. Further, FIG. 3 is an enlarged cross-sectional view of part A in FIG.
In FIGS. 2 and 3, the motor 3, the circuit board 4, and the housing 5 are fixed to each other by screws 18. As shown in FIG. 1, the circuit board 4 is formed with a screw insertion hole 23 through which the male screw portion of the screw 18 is inserted, and the housing 5 is also formed with a screw insertion hole 29b. Further, the flange portion 8 of the motor 3 is formed with a screw hole 9 that meshes with the male screw portion of the screw 18. The male screw portion of the screw 18 meshes with the screw hole 9 of the motor 3 through the screw insertion holes 23 and 29b.

As shown in FIG. 4, the motor 3 includes a stator portion 31 and a rotor portion 32. The motor 3 includes a motor shaft 19 that rotates integrally with the rotor portion 32, a bearing 15 that is attached to the motor shaft 19 and rotatably supports the motor shaft 19, and a teeth portion 21 of the stator portion 31 (FIGS. 2 and 3). It has a lead wire 22 which is wound around the motor coil to form a motor coil, and a part of the lead wire 22 constitutes the terminal 22a of the motor 3 as it is. Specifically, the end of the coiled conducting wire 22 on the winding end side constitutes the terminal 22a. The conducting wire 22 corresponds to a coil wire forming a motor coil.

The motor 3 is, for example, a three-phase motor. A plurality of terminals 22a are provided on one motor 3. Of the plurality of terminals 22a, some of the terminals 22a are UVW terminals 22a-1 (see FIG. 5), and the other terminals 22a are neutral point terminals 22a-2 (see FIG. 5). The UVW terminal 22a-1 is a terminal composed of a conducting wire connected to a power supply unit of each of the U-phase, V-phase, and W-phase. The neutral point terminal 22a-2 is a terminal composed of a conducting wire connected to the neutral points of the U-phase neutral point, the V-phase neutral point, and the W-phase neutral point.

Each terminal 22a has a crank bending shape having two

bent portions

22b and 22c. Further, the terminal 22a extends upward from the coil winding portion of the conducting wire 22 in FIGS. 2 and 3 by changing the direction of the conducting wire 22 at the two

bent portions

22b and 22c. The terminals 22a extend in the plate thickness direction of the circuit board 4, except for the

bent portions

22b and 22c.

A plurality of terminal receiving holes 25 are formed on the circuit board 4. The plurality of terminal receiving holes 25 are arranged on the outer peripheral side of the circuit board 4 with respect to the opening holes 11 so as to have a substantially arc shape as shown by the alternate long and short dash line in FIG. The terminal receiving hole 25 is a through hole for soldering the terminal 22a of the motor 3. On the other hand, as shown in FIGS. 2 and 3, a plurality of terminal insertion holes 27 are formed in the housing 5. The terminal insertion hole 27 is a through hole for inserting the terminal 22a of the motor 3. The terminal insertion hole 27 has a tapered shape in which the cross-sectional area gradually decreases from the motor 3 side to the circuit board 4 side. Specifically, as shown in FIG. 3, the terminal insertion hole 27 has a straight hole portion 27a and a tapered hole portion 27b. The tapered hole portion 27b has a concave (mortar-shaped) tapered shape. The straight hole portion 27a is arranged closer to the circuit board 4 than the tapered hole portion 27b. The straight hole portion 27a has a uniform hole diameter, and the tapered hole portion 27b has a hole diameter gradually decreasing from the motor 3 side toward the circuit board 4.

The periphery of the terminal insertion hole 27 in the housing 5 is raised in a trapezoidal conical shape following the shape of the tapered hole portion 27b to form the first protruding portion 28. A substrate receiving surface 28a (see FIG. 3) for receiving the circuit board 4 is formed on the top of the first protruding portion 28. In FIG. 3, the upper end of the straight hole portion 27a is opened by the substrate receiving surface 28a. The first projecting portion 28 is formed so as to project in the thickness direction of the housing 5, and the substrate receiving surface 28a is formed in a plane shape in a direction orthogonal to the thickness direction of the housing 5. The thickness direction of the housing 5 is the same as the thickness direction of the circuit board 4 when the circuit board 4 is attached to the housing 5.

Further, the housing 5 is formed with a second protruding portion 29 in addition to the first protruding portion 28 described above. A fixing surface 29a (see FIG. 3) for fixing the circuit board 4 is formed on the top of the second protruding portion 29. The second protruding portion 29 projects toward the circuit board 4 in the same direction as the first protruding portion 28. The fixed surface 29a forms a plane parallel to the substrate receiving surface 28a. The substrate receiving surface 28a and the fixing surface 29a are formed flush with each other. The flush state means a flat state in which there is no step between the two surfaces (in this embodiment, the substrate receiving surface 28a and the fixed surface 29a).

Next, the assembly procedure (manufacturing method) of the valve timing control mechanism 1 according to the first embodiment will be described.
First, as shown in FIG. 1, after preparing the electronic control device 2 and the motor 3 which are the components of the valve timing control mechanism 1, the motor 3 is attached to the housing 5 before the circuit board 4 is attached to the housing 5. .. When the motor 3 is attached to the housing 5, the motor 3 is arranged on the lower surface side of the housing 5 in FIG. 5, and the bearing 15 of the motor 3 is aligned with the bearing accommodating portion 13 of the housing 5. Further, a plurality of terminals 22a protruding upward from the motor 3 are inserted into the corresponding terminal insertion holes 27 of the housing 5. At this time, the terminal 22a is guided by the tapered hole portion 27b and guided to the straight hole portion 27a, and projects upward from the substrate receiving surface 28a of the first protruding portion 28 through the straight hole portion 27a. As a result, even if the orientation of the terminal 22a protruding upward from the motor 3 varies, the terminal 22a can be smoothly inserted into the terminal insertion hole 27. Further, in a state where the terminal 22a is inserted into the terminal insertion hole 27, the orientation of the terminal 22a is regulated by the straight hole portion 27a. Therefore, by reducing the gap between the two, which is determined by the difference between the outer diameter of the terminal 22a and the inner diameter of the straight hole portion 27a, it is possible to suppress the variation in the orientation of the terminal 22a.

Next, the circuit board 4 is attached to the housing 5. Specifically, first, as shown in FIG. 6, the opening hole portion 11 of the circuit board 4 and the bearing accommodating portion 13 of the housing 5 are aligned and provided at the four corner portions of the circuit board 4. The screw insertion hole 23 and the corresponding screw insertion hole 29b of the housing 5 are aligned with each other. In FIG. 6, the notation of the motor 3 is omitted.

Next, as shown in FIG. 7, the circuit board 4 is housed in the board housing portion 12 of the housing 5. At this time, the bearing accommodating portion 13 of the housing 5 is inserted into the opening hole portion 11 of the circuit board 4, and the lower surface 4a of the circuit board 4 is inserted into the substrate receiving surface 28a and the fixing surface 29a of the housing 5 as shown in FIG. To contact. As a result, the circuit board 4 is arranged closer to the motor 3 than the upper surface 13a (see FIG. 7) of the bearing accommodating portion 13 in the thickness direction of the valve timing control mechanism 1. Therefore, the valve timing control mechanism 1 can be made thinner.

When the circuit board 4 is housed in the board accommodating portion 12 of the housing 5, the terminal 22a protruding from the first protruding portion 28 of the housing 5 is inserted into the corresponding terminal receiving hole 25 of the circuit board 4. In this case, as shown in FIG. 3, by setting the inner diameter of the terminal receiving hole 25 to be larger than the inner diameter of the straight hole portion 27a, interference between the terminal 22a and the circuit board 4 can be suppressed. Therefore, the terminal 22a can be smoothly inserted into the terminal receiving hole 25.

On the other hand, at the four corners of the substrate accommodating portion 12, the screw insertion holes 23 provided in the circuit board 4 and the screw insertion holes 29b provided in the second protrusion 29 are arranged coaxially, respectively. The male screw portion of the screw 18 is inserted into the screw insertion holes 23 and 29b. Then, the male screw portion of the screw 18 is engaged with the screw hole 9 (see FIG. 1) of the motor 3 to tighten the screw 18. As a result, the motor 3, the circuit board 4, and the housing 5 are fixed to each other by the tightening force of the screws 18.

Next, the terminal 22a of the motor 3 is soldered to the terminal receiving hole 25 of the housing 5. Soldering can be performed by reflow. The terminal receiving hole 25 is preliminarily plated for soldering. As a result, the terminal 22a and the terminal receiving hole 25 are electrically connected by the solder portion 30 (see FIG. 3). Therefore, the terminal 22a is in a state of being electrically connected to the circuit board 4 in a state of being inserted into the terminal insertion hole 27 and the terminal receiving hole 25. As shown in FIG. 5, the terminals 22a of the motor 3 connected to the circuit board 4 in this way are the UVW terminal 22a-1 and the neutral point terminal 22a-2. The three terminals 22a, which are UVW terminals 22a-1, are electrically connected to the corresponding U-phase, V-phase, and W-phase power supply units. Further, the three terminals 22a, which are the neutral point terminals 22a-2, are electrically connected to the corresponding neutral points of the U phase, the V phase, and the W phase.

Next, the cover 7 is attached to the housing 5. The cover 7 is attached using screws (not shown).
As a result, the assembly of the valve timing control mechanism 1 is completed.

As described above, in the valve timing control mechanism 1 according to the first embodiment, the plurality of terminals 22a of the motor 3 are a plurality of terminal insertion holes 27 formed in the housing 5 and a plurality of terminals 22a formed in the circuit board 4. It is electrically connected to the circuit board 4 in a state of being inserted into the terminal receiving hole 25 of the above. That is, the terminal 22a of the motor 3 is directly connected to the circuit board 4 without using a relay terminal such as a bus bar. As a result, it is not necessary to secure a space for arranging the relay terminal or the like inside the valve timing control mechanism 1, so that the valve timing control mechanism 1 can be miniaturized. Further, when the conductor 22 of the motor 3 is electrically connected to the circuit board 4, it is sufficient to insert the terminal 22a, which is a part of the conductor 22, into the terminal receiving hole 25 of the circuit board 4 and solder it. Therefore, the valve timing control mechanism 1 can be easily assembled as compared with the case where the relay terminal is used. Further, since the resin housing 5 is interposed between the motor 3 and the circuit board 4, the heat from the motor 3 side can be blocked by the housing 5. As a result, the heat generated by the motor 3 is less likely to be transferred to the circuit board 4, so that the circuit board 4 can be protected from the heat of the motor 3. Further, by attaching the circuit board 4 to the housing 5 after attaching the motor 3 to the housing 5, the terminal 22a is inserted into the terminal insertion hole 27 to prevent the variation in the position of the terminal 22a caused by the motor 3 alone. Can be reduced by Therefore, when the terminal 22a is inserted into the terminal receiving hole 25, the positioning of the terminal 22a and the terminal receiving hole 25 can be easily performed.

Further, in the first embodiment, the terminal 22a of the motor 3 has a crank bending shape. Therefore, the expansion and contraction of the terminal 22a due to heat shrinkage can be absorbed by the crank bending shape having the two bending

portions

22b and 22c. As a result, the stress applied to the solder portion 30 of the circuit board 4 when the terminal 22a is thermally shrunk can be relaxed.

Further, in the first embodiment, the terminal insertion hole 27 formed in the housing 5 has a tapered shape in which the cross-sectional area gradually decreases from the motor 3 side to the circuit board 4 side, and the housing 5 has a circuit board. It has a fixing surface 29a for fixing 4 and a substrate receiving surface 28a for receiving the circuit board 4, and the fixing surface 29a and the substrate receiving surface 28a are formed flush with each other. As a result, the terminal 22a of the motor 3 can be guided by the terminal insertion hole 27 and guided to the terminal receiving hole 25. Further, when the circuit board 4 is attached to the housing 5, the posture of the circuit board 4 can be stabilized.

Further, in the first embodiment, the plurality of terminal receiving holes 25 formed in the circuit board 4 are arranged on the outer peripheral side so as to have a substantially arc shape. In a small motor, the coil wire can be wound all at once by winding the crossover wire outward in the motor manufacturing process. Therefore, the winding end position of the coil wire is arranged on the outer peripheral side. Therefore, by arranging a plurality of terminal receiving holes 25 on the outer peripheral side in the same manner as the winding end position of the coil wire and arranging the terminal receiving holes 25 directly above the winding end position, the terminals 22a of the motor 3 and the circuit board 4 are arranged. Can be directly connected to.

Further, in the first embodiment, the resin housing 5 is formed with a connector portion 14 for electrically connecting to the outside, and the circuit board 4 is provided with a connector connecting portion 17 for connecting to the connector portion 14. An opening hole 11 is formed between the terminal receiving holes 25 and the plurality of terminal receiving holes 25. As a result, the valve timing control mechanism 1 as a whole can be miniaturized by improving the wiring efficiency of the circuit board 4.

Further, in the first embodiment, the terminals 22a of the motor 3 connected to the circuit board 4 are the UVW terminal 22a-1 and the neutral point terminal 22a-2. As a result, when power is supplied from the circuit board 4 to the motor 3, the neutral point terminal 22a-2 can be used to measure an accurate current value. Therefore, it is possible to calculate the induced current generated when a current is passed through the coil of the motor 3 without using a sensor magnet. That is, according to the first embodiment, it is possible to adopt the sensor magnetless technique.

[Second Embodiment]
Subsequently, the second embodiment will be described. In the second embodiment, the same components as the components mentioned in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.
FIG. 8 is a vertical cross-sectional view showing a state in which the motor 3, the circuit board 4, and the housing 5 are fixed to each other in the valve timing control mechanism 1 according to the second embodiment. Further, FIG. 9 is an enlarged vertical cross-sectional view of portion B of FIG.
As shown in FIGS. 8 and 9, the terminal 22a of the motor 3 is connected to the circuit board 4 through the terminal insertion hole 27 formed in the housing 5. As shown in FIG. 9, the terminal insertion holes 27 have a first tapered shape portion 271 whose cross-sectional area gradually decreases from the motor 3 side toward the circuit board 4 side, and the terminal insertion holes 27 from the motor 3 side toward the circuit board 4 side. It has a second tapered shape portion 272 whose cross-sectional area gradually increases. The inner diameter of the terminal insertion hole 27 is the minimum diameter at the boundary portion 273 between the first tapered shape portion 271 and the second tapered shape portion 272. In the following description, the minimum diameter of the terminal insertion hole 27 will be referred to as the inner diameter of the terminal insertion hole 27. The inner diameter of the terminal insertion hole 27 is set to be larger than the outer diameter of the terminal 22a. Further, the inner diameter of the terminal insertion hole 27 is set smaller than the inner diameter of the terminal receiving hole 25. The terminal 22a of the motor 3 is electrically connected to the circuit board 4 by the solder portion 30 in a state of being inserted into the terminal insertion hole 27 of the housing 5 and the terminal receiving hole 25 of the circuit board 4.

Here, the dimensional difference (mm) between the inner diameter (minimum diameter) of the terminal insertion hole 27 and the outer diameter of the terminal 22a is ΔD1, and the dimensional difference (mm) between the inner diameter of the bearing accommodating portion 13 and the outer diameter of the bearing 15 is defined as ΔD1. If ΔD2, ΔD1 is smaller than ΔD2. As a result, the clearance caused by the dimensional difference between the inner diameter (minimum diameter) of the terminal insertion hole 27 and the outer diameter of the terminal 22a is smaller than the clearance caused by the dimensional difference between the inner diameter of the bearing accommodating portion 13 and the outer diameter of the bearing 15. Become.

A groove 45 is formed around the terminal insertion hole 27 in the housing 5. The groove 45 is formed in a circular shape in a plan view so as to surround the terminal insertion hole 27. An O-ring 42 is attached to the groove 45. The O-ring 42 is formed in an annular shape in a plan view. The O-ring 42 is provided as an example of the sealing member. The O-ring 42 is compressed and deformed in close contact with the bottom surface of the groove 45 and the bottom surface of the circuit board 4. The seal member is not limited to the O-ring 42, and may be an annular elastic body surrounding the terminal insertion hole 27.

In the valve timing control mechanism 1 according to the second embodiment, an O-ring 42 is arranged around the terminal insertion hole 27. Therefore, the following effects can be obtained as compared with the case where the O-ring 42 is not arranged. First, when the O-ring 42 is not arranged, as shown by the arrow in FIG. 8, the foreign matter 40 generated on the electronic control device 2 side may invade the motor 3 side through the terminal insertion hole 27 of the housing 5. Then, if the foreign matter 40 that has entered the motor 3 side bites into the O-ring 41 existing in the gap between the bearing accommodating portion 13 and the bearing 15, for example, the O-ring 41 may be damaged. On the other hand, when the O-ring 42 is arranged, as shown in FIG. 9, when the foreign matter 40 generated on the electronic control device 2 side enters between the circuit board 4 and the housing 5, the terminal insertion hole 27 The movement of the foreign matter 40 toward is blocked by the O-ring 42. Therefore, the O-ring 42 can prevent the foreign matter 40 generated on the electronic control device 2 side from entering the motor 3 side through the terminal insertion hole 27 of the housing 5.

Further, in the second embodiment, the O-ring 42 constitutes a seal member that has the effect of suppressing foreign matter intrusion as described above. Therefore, it is possible to suppress the intrusion of foreign matter 40 from the electronic control device 2 side to the motor 3 side at low cost.

Further, in the second embodiment, the dimensional difference between the inner diameter of the terminal insertion hole 27 and the outer diameter of the terminal 22a is smaller than the dimensional difference between the inner diameter of the bearing accommodating portion 13 and the outer diameter of the bearing 15. Therefore, for example, as shown in FIG. 10, even if a foreign matter 40a that may bite into the gap between the bearing accommodating portion 13 and the bearing 15 exists inside the O-ring 42, the foreign matter 40a is on the motor 3 side. It is possible to suppress the fall. As a result, it is possible to prevent the foreign matter 40a from getting caught in the gap between the bearing accommodating portion 13 and the bearing 15.

Incidentally, as the foreign matter 40a generated inside the O-ring 42, a solder ball generated when the terminal 22a of the motor 3 is soldered to the terminal receiving hole 25 of the circuit board 4 by reflow can be considered. The size (diameter) of the solder balls generated by reflow is about 0.15 mm. Therefore, the dimensional difference between the inner diameter of the terminal insertion hole 27 and the outer diameter of the terminal 22a is preferably less than 0.15 mm (however, not including zero), and more preferably 0.12 mm or less (however, zero). Not included). By setting the dimensional difference between the inner diameter of the terminal insertion hole 27 and the outer diameter of the terminal 22a in this way, foreign matter 40a such as solder balls generated during reflow can enter the motor 3 side through the terminal insertion hole 27. It can be effectively suppressed.

<Modification example, etc.>
The present invention is not limited to the above-described embodiment, and includes various modifications. For example, in the above-described embodiment, the contents of the present invention are described in detail so as to be easy to understand, but the present invention is not necessarily limited to those including all the configurations described in the above-described embodiment. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete some of the configurations of each embodiment, add other configurations, or replace them with other configurations.

1 ... Valve timing control mechanism, 3 ... Motor, 4 ... Circuit board, 5 ... Housing, 11 ... Opening hole, 13 ... Bearing housing, 14 ... Connector, 15 ... Bearing, 17 ... Connector connection, 22 ... Conductor wire, 22a ... terminal, 22a-1 ... UVW terminal, 22a-2 ... neutral point terminal, 25 ... terminal receiving hole, 27 ... terminal insertion hole, 29a ... fixed surface, 28a ... substrate receiving surface, 42 ... O-ring ( Sealing material)

Claims

Motor for valve timing control and
A circuit board having a drive circuit for driving the motor and
A resin housing provided between the motor and the circuit board is provided.
The plurality of terminals of the motor are electrically conductive with the circuit board in a state of being inserted into the plurality of terminal insertion holes formed in the resin housing and the plurality of terminal receiving holes formed in the circuit board. Valve timing control mechanism.
The terminal insertion hole has a tapered shape in which the cross-sectional area gradually decreases from the motor side to the circuit board side.
The housing has a fixing surface for fixing the circuit board and a substrate receiving surface for receiving the circuit board, and the fixing surface and the substrate receiving surface are formed flush with each other. Item 1. The valve timing control mechanism according to Item 1.
The resin housing has a bearing accommodating portion for accommodating the bearing of the motor.
The circuit board has an opening hole through which the bearing accommodating portion is inserted.
The valve timing control mechanism according to claim 2, wherein the circuit board is arranged closer to the motor than the upper surface of the bearing accommodating portion.
The valve timing control mechanism according to claim 3, wherein the terminal of the motor has a crank bending shape.
The valve timing control mechanism according to claim 4, wherein the plurality of terminal receiving holes formed in the circuit board are arranged on the outer peripheral side so as to form a substantially arc shape.
A connector portion for electrically connecting to the outside is formed in the resin housing, and the circuit board has a connector portion connected to the connector portion and a plurality of terminal receiving holes. The valve timing control mechanism according to claim 5, wherein the opening hole is formed in the valve timing control mechanism.
The valve timing control mechanism according to claim 6, wherein the terminals of the motor connected to the circuit board are a UVW terminal and a neutral point terminal.
The motor has conductors that make up the motor coil.
The terminal, which is the end of the lead wire on the winding end side, is connected to the circuit board through a terminal insertion hole formed in the housing.
The valve timing control mechanism according to claim 1, wherein an annular seal member is arranged around the terminal insertion hole so as to surround the terminal insertion hole.
The valve timing control mechanism according to claim 8, wherein the seal member is an O-ring.
Bearings are attached to the motor shaft, which is the output shaft of the motor.
A bearing accommodating portion for accommodating the bearing is formed in the housing.
The valve timing control mechanism according to claim 8, wherein the dimensional difference between the inner diameter of the terminal insertion hole and the outer diameter of the terminal is smaller than the dimensional difference between the inner diameter of the bearing accommodating portion and the outer diameter of the bearing.
The valve timing control mechanism according to claim 10, wherein the dimensional difference between the inner diameter of the terminal insertion hole and the outer diameter of the terminal is less than 0.15 mm (however, not including zero).