Circuit board housing and electric actuator

Abstract

To improve the workability of a lead wire soldering work on a substrate while reducing the number of components.SOLUTION: One aspect of a substrate housing case includes a case body in which a substrate having an electronic component mounted thereon is housed, a substrate holding part that holds the substrate in the case body, and a terminal holding part that is projected from an inner surface of the case body so as to hold a portion of a terminal of a lead wire to be soldered to the substrate, thereby keeping the orientation of the lead wire in the case body with the terminal located at a soldering position on the substrate, the lead wire having the terminal at the end thereof.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a substrate housing case and an electric actuator. [Background technology]

[0002] A structure for soldering lead wires to a circuit board is disclosed, for example, in Patent Document 1. In Patent Document 1, a connection terminal is attached to a circuit board, and the lead wires are soldered to the connection terminal. The lead wires are soldered to the circuit board via the connection terminal. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 4-162377 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the structure of Patent Document 1, in order to solder the lead wires to the connection terminals, three hands are required: one to hold the lead wires, one to hold the solder, and one to hold the soldering iron. In addition, since the lead wires are soldered while being held down one by one, the soldering work takes a long time.

[0005] To address this issue, it is possible to hold the lead wires with a separate part before soldering them to the board, or to solder a separate part into which the lead wires are assembled to the board. However, this would increase the number of parts, increase the amount of work required, and raise costs. SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to improve the workability in soldering lead wires to a substrate while reducing the number of components. [Means for solving the problem]

[0006] One aspect of a board storage case according to the present invention comprises a case body in which a board having electronic components mounted thereon is stored, a board holding portion which holds the board within the case body, and a terminal holding portion protruding from the inner surface of the case body which holds a part of a lead wire having a terminal at an end thereof which is soldered to the board, thereby maintaining the position of the lead wire within the case body in such a manner that the terminal is located at the soldering point on the board.

[0007] Moreover, one aspect of the electric actuator according to the present invention comprises the above-mentioned board housing case, the above-mentioned board, the above-mentioned lead wires, and an actuator unit that is driven using an output from the above-mentioned board. Effect of the Invention

[0008] According to the present invention, the workability in soldering lead wires to a substrate can be improved while reducing the number of parts. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram conceptually showing the structure of an oil pump. [Diagram 2] FIG. 2 is a diagram showing the inside of the board case with the lid open. [Diagram 3] FIG. 3 is a perspective view of the inside of the board case, as viewed from the sensor board side to the terminal holding portion side. [Figure 4] FIG. 4 is a view showing the covered wire portion holding portion with the covered wire portion of the lead wire removed. [Diagram 5] FIG. 5 is a perspective view of the covered wire portion held by the covered wire portion holding portion, as viewed from the side of the covered wire portion holding portion. [Figure 6] FIG. 6 is a diagram showing a detailed structure of the terminal. [Figure 7] FIG. 7 is a diagram showing a detailed structure of the terminal holding portion. [Figure 8] FIG. 8 is a cross-sectional view showing the positional relationship between the terminal holding portion and the sensor substrate. [Figure 9] FIG. 9 is a diagram showing a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, with reference to the accompanying drawings, an embodiment of the substrate housing case and the electric actuator of the present disclosure will be described in detail. However, in order to avoid the following description becoming unnecessarily redundant and to facilitate understanding by those skilled in the art, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters and duplicated description of substantially the same configuration may be omitted. In addition, elements described in the previously described figures may be appropriately referenced in the description of the later figures. FIG. 1 is a diagram conceptually showing the structure of an oil pump. The oil pump 100 corresponds to one embodiment of the electric pump of the present invention. The oil pump 100 includes a motor section 110, a sensor section 120, and a pump section 130. The motor unit 110 receives a supply of electric power and generates a rotational driving force. The sensor unit 120 detects the rotation of the motor unit 110 . The pump unit 130 is driven by the motor unit 110 and sucks and discharges oil. The combination of the motor unit 110 and the sensor unit 120 corresponds to one embodiment of the electric actuator of the present invention. The motor section 110 includes a motor housing 111 , a rotating shaft 112 , a rotor 113 , a stator 114 , and a bearing 115 .

[0011] The rotating shaft 112 is a member that transmits the rotational driving force of the motor unit 110. In the following description, the rotating shaft 112 is used as a reference for direction, and the direction along the rotating shaft 112 may be referred to as the axial direction. In addition, in the following description, regardless of the direction shown in the figure, the upper side in FIG. 1 may be referred to as one axial side, and the lower side in FIG. 1 may be referred to as the other axial side. Furthermore, in the following description, the direction perpendicular to the rotation center line of the rotating shaft 112 that approaches and deviates from the rotation center line may be referred to as the radial direction, the side closer to the rotating shaft 112 may be referred to as the radial inner side, and the side farther from the rotating shaft 112 may be referred to as the radial outer side.

[0012] The motor housing 111 is a structure that supports the motor section 110 and the oil pump 100 as a whole, and is formed, for example, by pressing a metal plate. The motor housing 111 accommodates a rotor 113 and a stator 114 therein. The motor housing 111 has a cylindrical section 111a extending in the axial direction, and a bottom section 111b located on one axial side of the cylindrical section 111a. The rotor 113 is fixed to the rotating shaft 112, has a permanent magnet built in, for example, and rotates together with the rotating shaft 112 by the action of a rotating magnetic field.

[0013] The stator 114 is accommodated in the motor housing 111 facing the rotor 113 and generates a rotating magnetic field. Note that, although an inner rotor type structure in which the stator 114 is disposed radially outside the rotor 113 is shown in this embodiment, the motor unit 110 may have an outer rotor type structure in which the stator 114 is disposed radially inside the rotor 113.

[0014] The bearing 115 is, for example, a ball bearing, and holds the rotating shaft 112 rotatably. The bearing 115 may be a roller bearing, a sliding bearing, or the like. The bearings 115 are disposed on one axial side and the other axial side across the rotor 113, and the bearing 115 on the one axial side is fixed to, for example, the bottom part 111b of the housing 111. The bearing 115 on the other axial side is held by, for example, the pump part 130. The sensor unit 120 includes a board case 121 and a sensor board 122 .

[0015] The board case 121 corresponds to one embodiment of a board storage case of the present invention, and is disposed on one axial side of the motor housing 111. The board case 121 is made of, for example, resin, and has a bottom 121a on the motor housing 111 side. The board case 121 has a main body that is open on one axial side, and a lid that covers the opening of the main body, but in the following description, there will be no particular distinction between the main body of the board case 121 and the board case 121.

[0016] Ends of conductors drawn from the coils of the stator 114 are guided to the board case 121, and in this embodiment, the board case 121 is used as a space for drawing out wiring to the motor unit 110. The board case 121 also houses and holds a sensor board 122 therein, for example.

[0017] The sensor board 122 is an example of a board on which electronic components are mounted, and has a magnetic sensor 122a, which is a type of electronic component. The board case 121 has a board holder 121b that holds the sensor board 122 inside the board case 121, and the sensor board 122 is held by the board holder 121b at a position where the magnetic sensor 122a faces a sensor magnet 112a fixed to an end of the rotating shaft 112. The magnetic sensor 122a detects the magnetism of the sensor magnet 112a, and the sensor board 122 detects the rotational position and rotational speed of the rotating shaft 112.

[0018] The board case 121 may house, together with the sensor board 122 or instead of the sensor board 122, a control board or an inverter board, which is another example of a board on which electronic components are mounted.

[0019] In this embodiment, the output of the sensor board 122 housed in the board case 121 is used for power control in a power supply circuit outside the oil pump 100, and the power controlled by this power control is supplied to the motor section 110 of the oil pump 100 to drive the motor section 110 and the pump section 130. The combination of the motor section 110 and the pump section 130 corresponds to an example of the actuator section referred to in the present invention. In other words, the motor section 110 and the pump section 130 are driven using the output from the sensor board 122.

[0020] When the board case 121 houses a control board, the motor unit 110 and the pump unit 130 may be driven according to a control signal output from the control board. That is, the motor unit 110 and the pump unit 130 may be driven using the output from the control board.

[0021] Furthermore, when the board case 121 houses an inverter board, the power output from the inverter board may be supplied to the motor unit 110 to drive the motor unit 110 and the pump unit 130. In other words, the motor unit 110 and the pump unit 130 may be driven using the output from the inverter board.

[0022] The pump section 130 has a pump housing 131 and an actuating section 132. While the motor housing 111 has a bottom section 111b on one axial side, the pump section 130 is disposed on the other axial side of the motor housing 111. This makes it easy to join the pump section 130 to the rotating shaft 112, etc., and ultimately makes it easy to assemble the oil pump 100.

[0023] The pump housing 131 accommodates an operating portion 132 and is fixed to the motor housing 111. The operating portion 132 rotates within the pump housing 131 by the driving force of the rotary shaft 112, thereby sucking in and discharging oil. FIG. 2 is a diagram showing the inside of the substrate case 121 with the lid open.

[0024] The board case 121 has therein the above-mentioned board holding portion 121b, terminal holding portion 121c, and covered wire portion holding portion 121d. The board holding portion 121b, terminal holding portion 121c, and covered wire portion holding portion 121d are made of resin and are integral with the board case 121. A lead wire 123 extending from outside the oil pump 100 is drawn into the board case 121. It can also be said that the lead wire 123 is drawn from inside the board case 121 to the outside of the oil pump 100.

[0025] The lead wire 123 has a terminal 123b at an end thereof that is soldered to the sensor board 122, and also has a covered wire portion 123a that extends from a conductor core wire that is covered with an insulating material. Specifically, the terminal 123b of the lead wire 123 is soldered to a conductor pad 122b on the sensor board 122 held by the board holding portion 121b. In this embodiment, the sensor board 122 expands in the radial direction, and the front and back surfaces of the sensor board 122 also expand in the radial direction. Of the front and back surfaces of the sensor board 122, the surface on which the terminal 123b of the lead wire 123 is soldered (i.e., the surface on which the conductor pad 122b is formed) may be referred to as the soldered surface of the sensor board 122 below.

[0026] The terminal holding portion 121c protrudes from the inner surface (specifically, the bottom portion 121a) of the board case 121, and holds a part of the terminal 123b of the lead wire 123, thereby maintaining the posture of the lead wire 123 within the board case 121. By maintaining the posture with the terminal holding portion 121c, the positional relationship between the terminal 123b of the lead wire 123 and the conductor pad 122b of the sensor board 122 is stabilized, improving the workability in the soldering operation of the lead wire 123 to the sensor board 122. Furthermore, since the terminal holding portion 121c is part of the board case 121, the number of parts is reduced, and the reduced number of parts also reduces costs.

[0027] The terminal 123b is held by the terminal holding portion 121c, improving workability regardless of the type or wire diameter of the lead wire 123. Furthermore, the terminal 123b of each of the multiple lead wires 123 is individually held by the terminal holding portion 121c, so no extra bending occurs compared to a structure in which the multiple lead wires 123 are held collectively, and therefore no secondary work such as correcting bending of each lead wire 123 is required, resulting in high workability.

[0028] The present invention focuses on improving the workability when soldering lead wires to a board, but the invention can also be applied to a system in which a lead wire held by a terminal holder is inserted into a connector on a board. In this case, too, the position and orientation of the lead wire terminals are stable, improving workability.

[0029] The covered wire portion holding portion 121d protrudes from the inner surface (specifically, the bottom portion 121a) of the board case 121 and holds the covered wire portion 123a of the lead wire 123. Since the lead wire 123 is held at multiple points by the terminal holding portion 121c and the covered wire portion holding portion 121d, the lead wire 123 is held firmly and has high durability against vibration, pulling of the lead wire 123, and the like. FIG. 3 is a perspective view of the inside of the board case 121, looking from the sensor board 122 side to the terminal holder 121c side.

[0030] The substrate case 121 has an outlet 121e in a side wall portion through which the lead wire 123 is drawn from the inside to the outside of the substrate case 121, and the terminal holding portion 121c is located between the outlet 121e and the sensor substrate 122. In addition, the coated wire holding portion 121d is located between the outlet 121e and the terminal holding portion 121c.

[0031] By providing the terminal holding portion 121c between the outlet 121e and the sensor board 122, the lead wire 123 only needs to be routed a short distance compared to when the terminal holding portion 121c is provided in another location, thereby reducing costs and preventing the terminal 123b from shifting or floating due to the reaction force of the routed lead wire 123.

[0032] FIG. 4 is a diagram showing the covered wire portion holding portion 121d with the covered wire portion 123a of the lead wire 123 removed, and FIG. 5 is an oblique view of the covered wire portion 123a held by the covered wire portion holding portion 121d, viewed from the side of the covered wire portion holding portion 121d.

[0033] The covered wire portion holding portion 121d has a groove portion 161, and the covered wire portion 123a of the lead wire 123 is sandwiched in the groove portion 161, so that the covered wire portion holding portion 121d holds the covered wire portion 123a. In other words, the covered wire portion holding portion 121d holds the covered wire portion 123a with the groove portion 161 extending along the covered wire portion 123a. The covered wire portion holding portion 121d having the groove portion 161 can obtain high holding performance with a simple structure. The covered wire portion holding portion 121d may hold the covered wire portion 123a with a structure other than a groove (for example, a hole, etc.).

[0034] 5, the entire outer diameter of the covered wire portion 123a fits within the groove portion 161. This protects the lead wire 123 from other components during and after the assembly process. In addition, even if an external force is applied to the lead wire 123, the lead wire 123 is prevented from falling off the covered wire portion holding portion 121d.

[0035] 3, the extending direction D of the groove 161 of the coated-wire-holding portion 121d is indicated by a dashed line. Focusing on one lead wire 123, the lead-out port 121e is positioned away from the extending direction D of the groove 161, and the terminal holding portion 121c and the soldering portion of the sensor board 122 (i.e., the conductor pad 122b) are positioned in the extending direction D of the groove 161.

[0036] Since the outlet 121e is offset from the direction D of the groove portion 161, even if an external force such as pulling is applied to the lead wire 123, the external force is prevented from being transmitted to the terminal holding portion 121c, thereby preventing the lead wire 123 from coming loose and protecting the soldered joint.

[0037] On the other hand, by positioning the terminal holding portion 121c and the conductor pad 122b in the direction D of the groove portion 161, the terminal 123b is stabilized on the conductor pad 122b, facilitating soldering and other operations. FIG. 6 is a diagram showing a detailed structure of the terminal 123b. The terminal 123 b has an extension portion 141 , a connection portion 142 , and a pair of legs 143 . The extension portion 141 has a shape that extends linearly. The connection portion 142 is crimped to the core wire of the covered wire portion 123a at one end of the covered wire portion 123a and is electrically connected to the core wire.

[0038] The pair of legs 143 extend from either side of the extending portion 141 and each protrude in a direction (downward in FIG. 6) intersecting with the extending portion 141. The legs 143 of the terminal 123b are used to hold the terminal 123b by the terminal holding portion 121c, as described below.

[0039] Fig. 7 is a diagram showing a detailed structure of terminal holding portion 121c, and Fig. 8 is a cross-sectional view showing the positional relationship between terminal holding portion 121c and sensor board 122. For convenience of explanation, Fig. 8 shows a state in which terminal 123b has been removed from terminal holding portion 121c to one axial side. The terminal holding portion 121c has an extending protrusion 151, a receiving surface 152, a hole 153, and an inner wall protrusion 154.

[0040] The extending protrusion 151 has a shape extending along the terminal 123b (particularly the extending portion 141), and in this embodiment, the terminal holding portion 121c has the extending protrusions 151 on both sides of the terminal 123b. The terminal holding portion 121c has the extending protrusion 151 at an end on one axial side, and the extending protrusion 151 protrudes to one axial side. The extending protrusion 151 determines the orientation of the terminal 123b to the conductor pad 122b of the sensor board 122. Therefore, when the terminal 123b is attached to the terminal holding portion 121c by an operator, the orientation of the terminal 123b is automatically determined, making soldering and other operations easier. The extended protrusion 151 may be provided with a stopper for the terminal 123b. For example, the stopper may have a structure in which a small protrusion protruding from the extended protrusion 151 side toward the terminal 123b side in a visor-like or semi-spherical shape is hooked onto the terminal 123b.

[0041] The receiving surface 152 is located between the extending protrusions 151 and receives the terminal 123b. The receiving surface 152 extends in the radial direction (i.e., extends along a reference plane P including the soldering surface of the sensor board 122) and faces one axial side. In this embodiment, the position of the receiving surface 152 is located on the other axial side of the reference plane P. The position of the receiving surface 152 may coincide with the reference plane P. In other words, the terminal holding portion 121c protrudes in a direction intersecting the reference plane P, and the receiving surface 152 is at the position of the reference plane P or does not reach the reference plane P.

[0042] When the position of the receiving surface 152 is located on the other axial side of the reference plane P, the terminal 123b received by the receiving surface 152 comes into proper contact with the conductive pad 122b, facilitating soldering.

[0043] The hole 153 has a shape recessed from the end of the terminal holding portion 121c toward the other axial side. In other words, the terminal holding portion 121c has the hole 153 recessed in a direction intersecting with the reference plane P. The pair of legs 143 of the terminal 123b are pressed into the hole 153, whereby the terminal 123b and the lead wire 123 are held by the terminal holding portion 121c. In other words, the terminal 123b has the legs 143 that enter the hole 153, and the legs 143 correspond to an example of the entry protrusion according to the present invention.

[0044] In this embodiment, as an example, the terminal 123b has a pair of legs 143, but the insertion protrusions referred to in the present invention may be one or three or more. As long as the terminal 123b can be held in a position where it can be soldered to the conductor pad 122b, the hole 153 may be a recessed shape or a hole shape in a direction along the reference plane P. Also, a plurality of holes 153 may be provided for one terminal 123b, for example, two holes 153 may be provided for one terminal 123b, and the pair of legs 143 may each be inserted into the hole 153 individually.

[0045] Terminal 123b is stably held by a structure in which a pair of legs 143, which are an example of penetration protrusions, are pressed into hole 153. Even if an external force is applied to lead wire 123, the external force is received by legs 143 and hole 153, so that the soldered portion connecting terminal 123b and conductor pad 122b is protected from the external force.

[0046] The inner wall protrusion 154 is provided on the inner wall of the hole 153, extends in the axial direction from the opening side to the bottom side, and protrudes into the inside of the hole 153. That is, the terminal holding portion 121c has the inner wall protrusion 154 protruding toward the inside of the hole 153 on the inner wall of the hole 153. The inner wall protrusion 154 contacts the leg 143 inserted into the hole 153 and presses the leg 143 into the inside of the hole 153. A pair of the inner wall protrusions 154 are provided facing each other, and the pair of inner wall protrusions 154 sandwich the pair of legs 143 from both sides. The inner wall protrusions 154 further improve the holding property of the terminal 123b and prevent the terminal 123b from falling off the terminal holding portion 121c.

[0047] Even if the inner wall protrusion 154 is not provided and the pair of legs 143 are open at the tip side and protrude against the inner wall of the hole 153, the retention of the terminal 123b is improved and the terminal 123b is prevented from falling off.

[0048] Inner wall protrusion 154 has a chamfered slope 155 on the opening side of hole 153. Slope 155 of inner wall protrusion 154 is inclined toward the inside of hole 153. In other words, inner wall protrusion 154 is chamfered on the opening side of hole 153 in a sloped shape that slopes toward the inside of hole 153. Since slope 155 guides leg 143 to the inside of hole 153, terminal 123b can be easily attached to terminal holding portion 121c. FIG. 9 is a diagram showing a modified example. 9, a needle 143a having an acute tip is formed on leg 143 of terminal 123b to prevent it from falling out. The tip of needle 143a faces one axial side, and leg 143 of terminal 123b is press-fitted into hole 153. Since needle 143a faces one axial side, leg 143 can be easily press-fitted. Furthermore, when leg 143 enters hole 153, needle 143a gets caught in the inner wall of hole 153 so as to pierce it, preventing terminal 123b from falling out of hole 153.

[0049] Although an oil pump is given as an example of a use of the electric actuator of the present invention, the use of the electric actuator of the present invention is not limited to the above. The electric actuator of the present invention can be used in a wide range of applications, such as pumps that suck in and discharge water, air, etc., power steering devices, and compressors.

[0050] The above-described embodiment should be considered as illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not by the above-described embodiment, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0051] 100: Oil pump 110: Motor section 111: Motor housing 112: Rotation axis 112a: Sensor magnet 113: Rotor 114: Stator 115: Bearings 120: Sensor section 121: Circuit board case 121a: Bottom 121b: Board holding part 121c: Terminal holding part 121d: Covered wire holding part 121e: Drawer opening 122: Sensor board 122a: Magnetic sensor 123: Lead wire 123a: Covered wire part 123b:Terminal 130: Pump section 131: Pump case 132: Operating unit 141: Stretching part 142: Connection part 143: Legs 151: Extension convex part 152: Receiving surface 153: Hole 154: Inner wall protrusion 155: Slope 161: Groove

Claims

1. A case body that houses a board on which electronic components are mounted; a substrate holding portion that holds the substrate within the case body; a terminal holding portion protruding from an inner surface of the case body, the terminal holding portion holding a part of a lead wire having a terminal at an end thereof to be soldered to the board, thereby maintaining a position of the lead wire within the case body; A circuit board housing case equipped with the above structure.

2. The substrate case according to claim 1 , wherein the terminal holding portion has an extending protrusion extending along the terminal.

3. the terminal holding portion has a hole portion recessed in a direction intersecting a reference plane including a board surface to which the terminal is soldered, The circuit board case according to claim 1 , wherein the terminal has an insertion protrusion that enters the hole.

4. The circuit board case according to claim 3 , wherein the terminal holding portion has an inner wall protrusion protruding toward the inside of the hole on an inner wall of the hole.

5. The substrate storage case according to claim 4 , wherein the inner wall protrusion is chamfered on an opening side of the hole to have an inclined surface facing inward of the hole.

6. the case body has an outlet through which the lead wire is drawn from inside to outside the case body, The circuit board case according to claim 1 , wherein the terminal holder is located between the outlet and the circuit board.

7. The lead wire has a covered wire portion that is an extending conductor core covered with an insulating material, 7. The circuit board storage case according to claim 6, further comprising a covered wire portion holding portion that protrudes from an inner surface of the case body to hold the covered wire portion and is positioned between the outlet port and the terminal holding portion.

8. The substrate storage case according to claim 7 , wherein the covered wire portion holding portion holds the covered wire portion in a groove portion extending along the covered wire portion.

9. The substrate case according to claim 8 , wherein the depth of the groove is greater than an outer diameter of the covered wire portion.

10. The outlet is positioned away from the extending direction of the groove, 10. The board storage case according to claim 8, wherein the terminal holding portion and the soldering portion of the board are positioned in a direction in which the groove portion extends.

11. the terminal holding portion has the extending protrusions on both sides of the terminal, and has a receiving surface between the extending protrusions that extends along a reference plane including a board surface to which the terminal is soldered and receives the terminal, 3. The circuit board case according to claim 2, wherein the terminal holding portion protrudes in a direction intersecting the reference plane, and the receiving surface is at the position of the reference plane or does not reach the reference plane.

12. A substrate housing case according to any one of claims 1 to 11, The substrate; The lead wire; an actuator section driven by using an output from the substrate; An electric actuator comprising:

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