JP4647676B2 - Electronic component board storage box - Google Patents

Description

  The present invention relates to an electronic component board storage box that houses a plurality of electronic component boards therein.

  Conventionally, a base body (pump body, hydro unit (H / U)) in which an oil passage is formed, various devices such as an electromagnetic valve and an electric motor provided on the base body, and control for controlling these various devices. 2. Description of the Related Art A vehicle brake hydraulic pressure control device in which a unit or the like is assembled is known. The control unit mainly includes a box-shaped control unit case (electronic device housing box) and a control unit main body (electronic component plate) housed in the box. The control unit main body is one of electronic component boards mainly including a substrate on which a predetermined circuit pattern is formed and an electronic component (for example, a transistor) mounted on the substrate. The control unit main body is electrically connected to the coil mounted on the electromagnetic valve, the electric motor, etc., and the control unit main body operates the electromagnetic valve, the electric motor, etc. in a predetermined manner so that the anti-lock brake control, etc. Is done.

  However, when such control is performed, the control unit body generates heat. Therefore, in order to dissipate this heat, conventionally, an electronic component plate used for heat dissipation, such as a heat radiating plate, is joined to the control unit main body by solder or the like and radiated through the heat radiating plate.

In relation to the technology for dissipating the heat of the control unit main body, a technology has been proposed in which a part of the control unit case is made of metal and the heat is dissipated through a part of the metal (see Patent Document 1). ). In addition, a technique for attaching a heat transfer plate that thermally connects the control unit main body and the metal base, transferring the heat of the control unit main body to the base via the heat transfer plate, and dissipating heat has been proposed ( Patent Document 2).
JP-A-8-58544 (paragraph numbers 0018 to 0020, FIG. 2) Japanese Patent Laid-Open No. 8-11692 (paragraph number 0033, FIG. 2)

  However, as described above, joining the heat radiating plate to the control unit main body with solder or the like is very troublesome, and the control unit main body, the heat radiating plate, etc. cannot be easily accommodated.

  Then, this invention makes it a subject to provide the electronic component board storage box which can accommodate easily several electronic component boards, such as a control unit main body and a heat sink.

As means for solving the above-mentioned problems, the present invention provides a control unit main body having electronic components, and a heat radiating plate disposed outside the control unit main body and thermally connected to the electronic components via a silicone film. Is an electronic component plate storage box for accommodating the box body, a first arm portion formed to project from the inner wall surface of the box body, and from the first arm portion toward the inner wall surface side. And a second arm portion having a first engagement portion that engages with one surface of the heat radiating plate and a second engagement portion that engages with one surface of the control unit body. A pair of the first arm portion and the second arm portion are provided so as to face each other in the surface direction of the control unit main body and the heat radiating plate. By holding the heat sink between the parts from the surface direction The control unit main body is engaged between the pair of opposing second engaging portions by sandwiching the control unit body from the surface direction, and the first arm portion, the second arm portion, and the first arm portion At least a part of the connecting portion with the second arm portion has elasticity, and when the first engaging portion engages with the heat radiating plate and the second engaging portion engages with the control unit main body, The electronic component and the heat radiating plate are thermally connected via the silicone film, and the control unit body and the heat radiating plate are configured to be snap-coupled to the second arm portion. This is a component board storage box.

Here, the inner wall surface of the box body includes a wall faced to the inside of the box body such as an intermediate wall in the first embodiment to be described later, in addition to a bottom wall and a peripheral wall constituting the box body.
The electronic component board is not only a so-called control board composed of a circuit pattern formed substrate and an electronic component fixed to the circuit pattern, but also other plate-like plates that are often used on the control board. An electronic component, for example, a heat radiating plate and a heat sink described in the embodiments described later are included.

According to such an electronic component board housing box, when housing the control unit main body and the heat sink , the first arm part, the second arm part, and the connecting part between the first arm part and the second arm part having elasticity At least a part of this can be deformed by bending it in a predetermined direction against its elasticity. Then, the first engagement portion of the second arm portion is engaged with one surface side of the heat radiating plate, and the second engagement portion is engaged with one surface side of the control unit main body , so that the control unit main body and the heat radiating plate are first. The second arm portion connected to the arm portion is snap-coupled, and the accommodation state of the control unit main body and the heat sink is maintained.
Moreover, since the 2nd arm part which has a 1st arm part, a 1st engaging part, and a 2nd engaging part is integral with a box main body, a number of parts decreases and the handling becomes easy.

In the electronic component board storage box, the control unit body and the heat radiating plate are formed so as to protrude from the inner wall surface inside the first arm portion in the surface direction of the control unit body and support the control unit body from the other surface side. It is preferable to provide the other surface side support part.

According to such an electronic component board storage box, the control unit main body can be supported from the other surface side by the other surface side support portion.

In the electronic component board storage box, it is preferable that the control unit main body is sandwiched in the thickness direction between the second engagement portion and the other surface side support portion.

According to such an electronic component board storage box, the control unit main body is sandwiched in the thickness direction between the second engagement portion of the second arm portion and the other surface side support portion, and the control unit main body Can be constrained in the thickness direction.

In the electronic component plate accommodating box, the portion to be sandwiched by a pair of said second arm portion of the control unit main body and the heat radiating plate, for regulating the movement in the plane direction of the control unit body and the heat radiating plate It is preferable that a notch is formed.

According Such electronic component plate accommodating box, the cutout formed in the portion which is sandwiched by the second arm of the pair of control unit main body and the heat radiating plate, restricting movement in the plane direction of the control unit main body and the heat radiating plate it can.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic component board storage box which can accommodate easily several electronic component boards, such as a control unit main body and a heat sink, can be provided.

Embodiments of the present invention will be described below with reference to the drawings as appropriate.
In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant descriptions are omitted.

≪Reference example≫
First, as a reference example, an outline of an electronic component board storage box will be described with reference to FIGS. 1 to 6. Here, the case where an electronic component board storage box is a control unit case of the brake fluid pressure control apparatus for vehicles is illustrated.
In the drawings to be referred to, FIG. 1 is an exploded perspective view of a vehicle brake hydraulic pressure control device according to a reference example. FIG. 2 is an exploded perspective view of the control unit shown in FIG. FIG. 3 is an XX cross-sectional view of the control unit case after the control unit main body and the heat sink are accommodated. FIG. 4 is an XX enlarged cross-sectional view of the projecting body before the assembly of the control unit main body and the heat sink. FIG. 5 is a schematic diagram for explaining the configuration of the protruding body shown in FIG. 4. FIG. 6 is an XX enlarged cross-sectional view of the protruding body after the control unit main body and the heat sink are assembled.

≪Vehicle brake fluid pressure control device≫
As shown in FIG. 1, a vehicle brake hydraulic pressure control device 1 according to a reference example includes an electric motor 11, a base 12, and a plurality of electromagnetic valves 13 attached to the base 12 from the back side to the front side. Various devices such as the pressure sensor 14 and a control unit 20 are mainly provided (only one is illustrated in FIG. 1).

  The base body 12 is a metal part having a substantially rectangular parallelepiped shape and formed of an aluminum alloy or the like. An insertion hole 12a for attaching various devices such as a solenoid valve 13 and a pressure sensor 14 to each side including the first mounting surface 12A on the front side of the base 12 and the second mounting surface 12B on the back side, and a master cylinder An inlet port 12b connected to (not shown) and an outlet port 12c connected to a wheel brake (not shown) are formed. An oil passage (not shown) that serves as a passage for the brake fluid is appropriately formed inside the base body 12. The plurality of electromagnetic valves 13 are valves that are attached to the base 12 and function as an inlet valve, an outlet valve, a cut valve, a suction valve, and the like in the oil passage in the base 12. The electric motor 11 is fixed to the second mounting surface 12B of the base 12 and serves as a power source for operating a plunger pump (not shown) that sends brake fluid in the oil passage in the base 12.

≪Control unit≫
The control unit 20 is a unit fixed to the first mounting surface 12A on the front side of the base 12. As shown in FIG. 2 in addition to FIG. 1, the control unit 20 includes a control unit main body 21 that is a kind of electronic component board, a heat radiating plate 23 that is also a kind of electronic component board, and a control unit case 30 (electronic parts). Board storage box).

<Control unit body>
The control unit main body 21 is electrically connected to the electric motor 11, the electromagnetic valve 13, the pressure sensor 14, etc., and monitors the brake fluid pressure via the pressure sensor 14 and controls the electric motor 11 and the electromagnetic valve 13. Such a control unit main body 21 mainly includes a substrate 21A on which a predetermined circuit pattern is formed, and electronic components 21B such as a CPU, a ROM, and a transistor fixed to the substrate 21A. The control unit main body 21 is formed with four mounting holes 21Aa through which four projecting bodies 42 described later are inserted.
Here, for convenience of explanation, as shown in FIG. 2, the left side (the back side in FIG. 2) and the right side (the near side in FIG. 2) are set from the case main body 40A toward the front side. Further, the “back side” according to the reference example corresponds to the “other side” in the claims. On the other hand, the “front side” according to the reference example corresponds to “one side” in the claims. Furthermore, let the protruding direction of the protruding body 42 be an axial direction.

<Heat sink>
The radiator plate 23 is a radiator for efficiently radiating the heat of the control unit main body 21 that generates heat during the operation of the vehicle brake hydraulic pressure control device 1, and is made of, for example, an aluminum alloy. In addition, the heat sink 23 is formed with four mounting holes 23a through which four projecting bodies 42 to be described later are inserted.
In the reference example, the case where the heat radiating plate 23 is a simple plate is described. However, the shape of the heat radiating plate 23 is not limited to this. For example, in order to increase the surface area appropriately, fins and irregularities are provided. Of course, it may be a shape. Although the case where the heat sink 23 is formed from an aluminum alloy has been described, the heat sink 23 may be formed using other materials as long as it has thermal conductivity and is sufficient for heat dissipation. Needless to say.

<Control unit case>
The control unit case 30 is a case that mainly accommodates the control unit main body 21 and the heat radiating plate 23 in a stacked state with a predetermined interval therebetween, and protects the control unit main body 21 and the heat radiating plate 23. The control unit case 30 mainly includes a case main body 40A (box main body), a case lid 51, and a seal member 52.

[Case body]
The case body 40A is a box that has a substantially rectangular parallelepiped shape. The case main body 40 </ b> A is provided at the intermediate position in the depth direction with respect to the peripheral wall 48, and an intermediate wall 41 (box wall, see FIG. 3) that partitions the front side space 40 a and the back side space 40 b, and the intermediate wall 41 And four protrusions formed to protrude from the intermediate wall surface 41a (inner peripheral surface) on the front side of the intermediate wall 41 (on the accommodated control unit main body 21 and heat sink 23 (electronic component plate) side) to the front side. And a body 42. The case main body 40A including the intermediate wall 41 and each protruding body 42 is integrally molded from an appropriate resin (for example, PBT: poly butylene terephthalate), and is made of the same material. Further, the outer shape of the front end of each protruding body 42 has a substantially conical shape, and only the arrangement thereof is different.
2 will be described below, and description of the other protruding bodies 42 will be omitted.

(Projection body)
As shown in FIGS. 4 and 5, the projecting body 42 projects from the intermediate wall surface 41 a to the front side and is formed in a substantially rectangular parallelepiped pedestal portion 43 and projects from the substantially central position of the pedestal portion 43 to the front side. A pair of arm portions 44, 44, and support portions 45, 45 (other surface side support portions) respectively protruding from the left and right outer sides of the arm portions 44, 44 on the front side of the pedestal portion 43. . More specifically, the pair of arm portions 44 and 44 are opposed to each other with a slit 42a having a predetermined width, and support portions 45 and 45 are respectively arranged outside the arm portions 44 and 44 with a predetermined interval. Yes. That is, the left side of the projecting body 42 and the right side of the projecting body 42 are symmetric with respect to the slit 42a.
And since a pair of arm parts 44 and 44 are resin as mentioned above, they have appropriate elasticity (flexibility). Accordingly, the arm main bodies 44A, 44A of the arm portions 44, 44 are bent toward the slit 42a against their own elasticity (flexibility). Further, since the support portions 45 and 45 are spaced apart from the arm portions 44 and 44 by a predetermined space, and there is a space between the support portion 45 and the arm portion 44, each arm portion 44 is located on the slit 42a side. It is designed to bend greatly.
Hereinafter, the left side of the projecting body 42 that is symmetrical will be described in detail, and the description on the right side will be omitted.

  The left arm portion 44 of the projecting body 42 includes an arm main body 44A (support member main body, see FIG. 5), a first engagement claw 44B (engagement portion), and a second engagement claw 44C (engagement portion). And have. The first engaging claw 44B is a claw that engages with the front side (one surface side) of the heat sink 23, and the second engaging claw 44C is a claw that engages with the front side (one surface side) of the substrate 21A (see FIG. 6). ).

As shown in FIG. 5, the arm main body 44 </ b> A is a two-stage semi-cylindrical body having a stepped outer peripheral surface and having a small diameter on the front side, and projects from the front side of the pedestal portion 43. That is, the arm main body 44A projects to the front side of the large-diameter semi-cylindrical body (this is referred to as the pedestal-side semi-cylindrical body 44A1) and the pedestal-part-side semi-cylindrical body 44A1. It is composed of a small-diameter semi-cylinder provided (this is referred to as a front-side semi-cylindrical body 44A2).
The pedestal portion side semi-cylindrical body 44 </ b> A <b> 1 has an arcuate support surface 44 </ b> A <b> 1 a on the front side, and when the heat sink 23 is attached to the projecting body 42, the support surface 44 </ b> A <b> 1 a is the back surface of the heat sink 23. (Other surface) is contacted and the heat sink 23 is supported from the back side (see FIG. 6). That is, the pedestal part side semi-cylindrical body 44A1 having the support surface 44A1a has a function as a stopper (other surface side support part) that prevents the heat radiating plate 23 from being inserted too much into the pedestal part 43 side.

The first engaging claw 44B is projected from the outer peripheral surface of the front-side semi-cylindrical body 44A2 toward the radially outer side (side of the arm main body 44A) on the front side (front end side) of the front-side semi-cylindrical body 44A2. The heat dissipating plate 23 engages with the front side of the heat dissipating plate 23 (see FIG. 6), and the heat dissipating plate 23 is configured to be snap-coupled to the arm main body 44A.
Further, the first engaging claw 44 </ b> B protrudes largely outward in the radial direction at a substantially intermediate position in the axial direction. That is, the outer peripheral surface of the first engaging claw 44B is a tapered surface having a maximum diameter at a substantially intermediate position in the axial direction, and the arm portion 44 can be easily moved to the slit 42a side when the heat sink 23 is attached or detached. To bend.

  An interval L1 between the first engaging claw 44B and the support surface 44A1a of the pedestal side semi-cylindrical body 44A1 is set slightly smaller than the thickness T2 of the heat sink 23 (L1 <T2, see FIG. 4). Therefore, when the heat radiating plate 23 is attached to the protruding body 42, the heat radiating plate 23 is sandwiched between the first engaging claw 44B from the front side and the support surface 44A1a from the back side, and its thickness It is constrained in the vertical direction (see FIG. 6). Therefore, as will be described later, the thermal connection between the heat radiating plate 23 and the electronic component 21B such as a CPU constituting the control unit main body 21 is favorably maintained.

The second engaging claw 44C protrudes from the outer peripheral surface to the outside (side of the arm main body 44A) on the pedestal side semicolumnar body 44A1 on the front side of the pedestal side semicolumnar body 44A1. The substrate 21A is engaged with the front side (see FIG. 6), and the substrate 21A (control unit main body 21) is configured to be snap-coupled to the arm main body 44A.
Further, the second engaging claw 44 </ b> C protrudes largely outward in the radial direction at a substantially intermediate position in the axial direction. That is, the outer peripheral surface of the second engaging claw 44C is a tapered surface having a maximum diameter at a substantially intermediate position in the axial direction, and when the control unit main body 21 is attached or detached, the arm portion 44 faces the slit 42a side. It is designed to bend easily.

  Furthermore, if the slit 42a is used as a reference, the projecting dimension of the second engaging claw 44C from the slit 42a is set larger than the projecting dimension of the first engaging claw 44B from the slit 42a. Thereby, a virtual circle (referred to as a second virtual circle) constituted by the left and right second engagement claws 44C and 44C is a virtual circle (first circle) constituted by the left and right first engagement claws 44B and 44B. 1 virtual circle).

Correspondingly, the sizes of the mounting hole 21Aa of the control unit main body 21 and the mounting hole 23a of the heat sink 23 are set.
More specifically, the mounting hole 23a of the heat sink 23 is set smaller than the first virtual circle (specifically, the first virtual circle when the left and right arm portions 44, 44 are bent toward the slit 42a). And larger than the second virtual circle (specifically, the second virtual circle when the left and right arm portions 44, 44 are bent toward the slit 42a). Thereby, the mounting hole 23a passes through the first engaging claws 44B and 44B, but cannot pass through the second engaging claws 44C and 44C, and the heat radiating plate 23 is connected to the first engaging claws 44B and 44B. 44B and the second engaging claws 44C, 44C are assembled.

  On the other hand, the mounting hole 21Aa of the control unit main body 21 includes the first virtual circle (specifically, the first virtual circle when the left and right arm portions 44, 44 are bent toward the slit 42a) and the second virtual circle. More specifically, it is set larger than the second virtual circle when the left and right arm portions 44, 44 are bent toward the slit 42a. Thereby, the mounting hole 21Aa passes through the left and right first engaging claws 44B and 44B and the second engaging claws 44C and 44C, and the control unit main body 21 is connected to the second engaging claws 44C and 44C. The support parts 45 are assembled between the support parts 45 and 45.

As described above, when the slit 42 a is used as a reference, the projection dimension of the second engagement claw 44 </ b> C closest to the intermediate wall 41 among the engagement claws is set to be the largest, and the first engagement claw 44 </ b> B separated from the intermediate wall 41. The projecting dimensions of the control unit main body 21 and the heat radiating plate 23 can be assembled at predetermined positions by setting the size of the mounting hole 21Aa and the size of the mounting hole 23a correspondingly. .
That is, as the distance from the intermediate wall 41 is increased, the projecting dimension of the engaging claw is set to be small step by step, and the mounting hole on the electronic component plate side is set to be small step by step correspondingly. Can be prevented from being assembled at an incorrect position.

  The support part 45 is an elongated plate-like piece, and is provided on the left edge of the pedestal part 43 so as to protrude toward the front side with a predetermined length. When the control unit main body 21 is attached to the projecting body 42, the end face on the front side of the support portion 45 abuts on the back surface (other surface) of the substrate 21A, and the substrate 21A (that is, the control unit main body 21). Is supported from the back side (see FIG. 6). That is, the support part 45 has a function as a stopper (other surface side support part) that prevents the control unit main body 21 from being inserted too much into the base part 43 side.

  An interval L2 between the second engagement claw 44C and the tip of the support portion 45 is set slightly smaller than the thickness T1 of the substrate 21A (L2 <T1, see FIG. 4). Therefore, in a state where the control unit main body 21 is attached to the projecting body 42, the control unit main body 21 is sandwiched between the second engagement claw 44C from the front side and the support portion 45 from the back side, It is constrained in the thickness direction (see FIG. 6). Therefore, the thermal connection between the electronic component 21B such as a CPU constituting the control unit main body 21 and the heat radiating plate 23, and the electrical connection between the control unit main body 21 and the pressure sensor 14 and the like are well maintained. Yes.

  The length of the second engaging claw 44C in the axial direction (the protruding direction of the protruding body 42) is set slightly larger than the thickness of the electronic component 21B fixed to the substrate 21A. Thus, when the control unit main body 21 is attached to the projecting body 42 and silicone S is applied to the front surface of the electronic component 21B, the heat sink 23 is attached to the projecting body 42. However, they are in close contact with each other through the silicone S, so that they are thermally connected well.

(Case lid)
As shown in FIGS. 1 and 3, the case lid 51 is detachably fixed by appropriate means (for example, vibration welding) so as to close the opening on the front side of the case main body 40A. Thereby, the front side space 40a in the case main body 40A is sealed, and the control unit main body 21 and the heat radiating plate 23 accommodated in the front side space 40a can be suitably protected from water and dust.

(Seal member)
As shown in FIG. 1, the seal member 52 is an annular (endless) elastic member (packing), and is provided on the case main body 40 </ b> A along the contact portion between the case main body 40 </ b> A and the base 12. Thereby, the base 12 and the case main body 40A are in good contact with each other in the assembled state, and the back side space 40b in the case main body 40A is well sealed (see FIG. 3). Therefore, it is possible to suitably protect the electromagnetic valve 13, the pressure sensor 14, and the coil 13a that is attached to the electromagnetic valve 13 from the water or dust.

≪Assembly of control unit and heat sink to case body≫
Next, a method for assembling the control unit main body 21 and the heat radiating plate 23 to the case main body 40A will be described with reference mainly to FIG. 2, FIG. 4, and FIG.

<Assembly of control unit body>
After aligning the four projecting bodies 42 of the case main body 40A and the four mounting holes 21Aa of the control unit main body 21, the front end of each projecting body 42 is passed through the corresponding mounting hole 21Aa (FIG. 2). reference). More specifically, after passing the first engagement claws 44B and 44B through the attachment holes 21Aa, the attachment holes 21Aa of the board 21A are brought into contact with the tapered surfaces on the front side of the second engagement claws 44C and 44C.
Then, the control unit main body 21 is pushed into the intermediate wall 41 side (see arrow A1 in FIG. 4). Then, in each projecting body 42, the arm portions 44 and 44 having elasticity (flexibility) are bent toward the slit 42a.
When the control unit main body 21 is pushed into the projecting body 42, the terminals such as the pressure sensor 14 and the bus bar B protruding from the intermediate wall 41 to the front side are connected terminals 21C (crimp terminals) provided on the substrate 21A. The control unit main body 21 is electrically connected via the connector.

  Then, the second engaging claws 44C and 44C pass through the attachment hole 21Aa to the front side. Thereafter, the front end surfaces of the support portions 45, 45 abut against the back surface of the substrate 21 </ b> A, and the pushing of the control unit main body 21 toward the intermediate wall 41 is stopped (see FIG. 6). Thereby, a predetermined interval is ensured between the control unit main body 21 and the intermediate wall 41, and heat of the control unit main body 21 is not directly transmitted to the intermediate wall 41.

  At the same time, the arm portions 44, 44 bent toward the slit 42 a return to an upright state with respect to the pedestal portion 43. That is, the second engagement claws 44C, 44C open radially outward (left side, right side), the second engagement claws 44C, 44C engage with the front side of the board 21A, and the board 21A is the arm main bodies 44A, 44A. (See FIG. 6). Thereby, the control unit main body 21 is prevented from coming out of the projecting body 42, and the accommodation state of the control unit main body 21 is maintained.

  At the same time, the substrate 21A is sandwiched between the second engagement claws 44C and 44C from the front side and the support portions 45 and 45 from the back side (see FIG. 6). Thereby, after attaching the control unit main body 21 to the protruding body 42, it is restrained in the thickness direction. Therefore, the electrical connection between the control unit main body 21 and the terminals etc. is maintained well.

  In addition, in the upright state of the arm parts 44 and 44, it is preferable that a slight clearance (clearance) is formed between the arm parts 44 and 44 and the mounting hole 21a of the substrate 21A. When the gap is formed in this way, the arm portions 44 and 44 do not remain bent in the accommodated state of the control unit main body 21 (substrate 21A), and the durability of the arm portions 44 and 44 is improved. is there.

<Assembly of heat sink>
Next, assembly of the heat sink 23 will be described.
First, as shown in FIG. 4, silicone S having high thermal conductivity is applied to the front surface of the electronic component 21 </ b> B of the control unit main body 21. Then, after aligning the four projecting bodies 42 of the case main body 40A and the four mounting holes 23a of the heat sink 23 (see FIG. 2), the front end of the projecting body 42 is inserted into the corresponding mounting hole 23a. Then, the heat sink 23 is pushed into the intermediate wall 41 (see arrow A2 in FIG. 4). Then, in each projecting body 42, the elastic arm portions 44, 44 bend toward the slit 42a.

Thereafter, after the first engaging claws 44B and 44B pass through the mounting hole 23a, the support surfaces 44A1a and 44A1a abut against the back surface of the heat sink 23, and the pushing of the heat sink 23 toward the intermediate wall 41 is stopped. (See FIG. 6).
In addition, when the heat sink 23 is pushed in, the silicone S is spread and the heat sink 23 and the electronic component 21B are thermally connected.

  At the same time, the bent arm portions 44 and 44 return to an upright state with respect to the pedestal portion 43. Then, the first engaging claws 44B and 44B open radially outward, the first engaging claws 44B and 44B engage with the front side of the heat sink 23, and the heat sink 23 is snap-coupled to the arm body (see FIG. 6). Thereby, it is prevented that the heat sink 23 slips out from the protruding body 42, and the accommodation state of the heat sink 23 is maintained.

At the same time, the heat radiating plate 23 is sandwiched between the first engagement claws 44B and 44B from the front side and the support surfaces 44A1a and 44A1a from the back side (see FIG. 6). Thereby, after attaching the heat sink 23 to the protrusion 42, it is restrained in the thickness direction. Therefore, the thermal connection between the heat sink 23 and the electronic component 21B is maintained well.
In addition, in the upright state of the arm portions 44, 44, it is preferable that a slight gap is formed between the arm portions 44, 44 and the mounting hole 23a of the heat radiating plate 23. This is because the arm portions 44 and 44 do not remain bent in the accommodated state of the heat sink 23, and the durability of the arm portions 44 and 44 is improved.

  As described above, according to the case main body 40A according to the reference example, a plurality of electronic component boards such as the control unit main body 21 and the heat radiating plate 23 can be easily accommodated without using solder or the like as in the related art. Further, the heat radiating plate 23 can be thermally connected and fixed to the control unit main body 21 without requiring labor and cost such as soldering. Furthermore, since a plurality of electronic component boards (the control unit main body 21 and the heat radiating plate 23) can be attached to one protruding body 42, the case main body 40A is compared with the case where a protruding body is provided for each electronic component board. It is possible to prevent compression of the inner space and to suppress an increase in cost and weight due to an increase in the number of parts. Furthermore, the projecting dimension of the first engaging claw 44B and the projecting dimension of the second engaging claw 44C of one projecting body 42 are different from each other. By making the mounting hole 23a and the mounting hole 21Aa of the board 21A different from each other, there is an erroneous assembly suppressing effect that prevents the electronic component plates corresponding to the respective engaging claws from being assembled to the wrong engaging claws. .

<< First Embodiment >>
Next, the control unit according to the first embodiment will be described with reference to FIGS. In the drawings to be referred to, FIG. 7 is an exploded perspective view of the control unit according to the first embodiment. FIG. 8 is a YY sectional view of the projecting body before the assembly of the control unit main body and the heat sink. FIG. 9 is a YY sectional view of the projecting body after the control unit main body and the heat sink are assembled.

<Case body>
The control unit according to the first embodiment is mainly characterized in that it includes a case body 40B different from the case body 40A according to the reference example, as shown in FIG. The case body 40B includes four projecting bodies 60 instead of the four projecting bodies 42 (see FIG. 2) according to the reference example. Although the four projecting bodies 60 are arranged at substantially the same position as the four projecting bodies 42 according to the reference example, the four projecting bodies 60 connect the control unit main body 22 and the heat sink 24 in FIG. By sandwiching from the vertical direction (the surface direction of the control unit main body 22 and the heat radiating plate 24), it is accommodated in the case main body 40B. Therefore, the control unit main body 22 and the heat radiating plate 24 according to the first embodiment do not have mounting holes.
The control unit main body 22 has four cutouts 22Aa. When the control unit main body 22 is accommodated in the case main body 40B, the four cutouts 22Aa are engaged with the four projecting bodies 60, respectively. The movement of the control unit main body 22 is restricted in the left-right direction in FIG. Similarly, the heat radiating plate 24 has four notches 24 a that engage with the four projecting bodies 60.
Each protruding body 60 is formed integrally with the case main body 40B as in the reference example. Accordingly, the first arm portion 71, the connecting portion 72, and the second arm portion 73, which will be described later, all resist the elasticity (flexibility) of the control unit main body 22 and the radiator plate 24 (hereinafter referred to as the inner side). It is possible to open outward (upper or lower) opposite to that.

[Projection body]
The four projecting bodies 60 have the same shape in the vertical position of FIG. Here, the protruding body 60 disposed on the upper right side from the case main body 40B toward the front side will be described with reference to FIGS.

  As shown in FIG. 8, the protruding body 60 includes a first protruding body 70, a second protruding body 80, and a pedestal portion 90. The second projecting body 80 is disposed on the inner side than the first projecting body 70.

(First projecting body)
The first projecting body 70 projects from the intermediate wall 41a on the front side (electronic component plate side) of the intermediate wall 41 (box wall) and projects from the pedestal 90 to the front side. A plate-like first arm portion 71, a connecting portion 72 (folded portion) having a semicircular cross-sectional view extending inward from the front-side tip of the first arm portion 71, and an intermediate wall surface 41 a from the tip of the connecting portion 72. And a second arm portion 73 extending obliquely toward the side. More specifically, the second arm portion 73 extends obliquely from the distal end of the connecting portion 72 toward the intermediate wall 41 while being inclined toward the direction (inner side) in which the electronic component board is sandwiched. Accordingly, the second arm portion 73 extends obliquely from the first arm portion 71 toward the intermediate wall 41 via the connecting portion 72.

(First projecting body-second arm)
The second arm portion 73 includes a first engaging portion 73a, a groove portion 73b, and a second engaging portion 73c from the connecting portion 72 side toward the intermediate wall 41 side.
The 1st engaging part 73a is a part which exhibits the elongate plate-shaped piece and engages with the front side of the heat sink 24 in the state in which the heat sink 24 was assembled | attached (refer FIG. 9). The groove portion 73 b is a portion in which the cross-sectional view has an inverted “U” shape and the upper edge of the heat radiating plate 24 is inserted. The groove width L3 of the groove 73b is set slightly smaller than the thickness T4 of the heat sink 24 (L3 <T4). Thereby, the heat sink 24 is clamped in the thickness direction by the first engaging portion 73a and the second engaging portion 73c.
The second engaging portion 73c is a portion that is an elongated plate-like piece and engages with the front side of the substrate 22A when the control unit main body 22 is assembled. Further, the second engaging portion 73 c also has a function as a stopper (other surface side support portion) that supports the back side of the heat sink 23.

(Second projecting body)
The second projecting body 80 includes a stopper 81 (another surface side support portion) and a third engagement portion 82.
The stopper 81 is a support portion on the other surface side that supports the back side of the substrate 22 </ b> A related to the control unit main body 22, presents an elongated plate-like piece, and projects from the intermediate wall surface 41 a on the front side of the intermediate wall 41. Is formed on the front side. The stopper 81 is disposed between the front end of the second engagement portion 73c on the intermediate wall 41 side and the intermediate wall 41, and the front end of the stopper 81 and the intermediate wall 41 of the second engagement portion 73c. The distance L4 from the side tip is set slightly smaller than the thickness T3 of the substrate 22A (L4 <T3). Accordingly, the substrate 22A is sandwiched between the second engaging portion 73c and the stopper 81.

  The third engaging portion 82 is an inverted “L” -shaped portion that extends outward from the front end of the stopper 81 and engages with the outer peripheral edge of the substrate 22A. Thereby, when the board | substrate 22A is assembled | attached, it is regulated in the up-down direction in FIG.

Further, the length in the vertical direction of the control unit main body 22 assembled closest to the intermediate wall 41 side (see FIG. 7) is between the projecting bodies 60 and 60 arranged in a pair of upper and lower positions between the openings of the grooves 73b and 73b. It is set shorter than the distance. Thereby, when the control unit main body 22 is assembled, the control unit main body 22 is not inserted into the opposed groove portions 73b and 73b, but abuts on both tapered surfaces (inclined surfaces) inside the opposed second engaging portions 73c and 73c. The second engaging portions 73c and 73c are spread outward and advanced toward the intermediate wall 41, and then come into contact with the second projecting bodies 80 and 80.
The position of the inner surface of the stopper 81 with which the outer peripheral edge of the substrate 22A engages is set on the inner side of the bottom surface of the groove 73b, and the control unit is constituted by a pair of stoppers 81, 81 arranged corresponding to the upper and lower sides. The main body 22 is sandwiched from above and below.

  On the other hand, the vertical length (see FIG. 7) of the heat radiating plate 24 assembled at a position farther from the intermediate wall 41 than the control unit main body 22 is set to be longer than the vertical length of the control unit main body 22. In addition, the distance between the opening portions of the opposed groove portions 73b and 73b when the pair of upper and lower first engaging portions 73a and 73a and the like are bent outward is set longer. Thereby, after the heat sink 24 is inserted into the groove portions 73b and 73b, it does not advance toward the intermediate wall 41 side, but is reliably assembled to the pair of opposed groove portions 73b and 73b.

  In this way, when the outer edge of the electronic component board is inserted and assembled into a pair of projecting bodies 60, 60 arranged to face each other, the width of the electronic component board (as shown in FIG. The vertical length in step 7) is set to be small step by step, and the distance between openings such as grooves into which each electronic component plate is inserted is set to be short step by step. Therefore, the electronic component board can be securely assembled at a predetermined position.

≪Assembly of control unit and heat sink to case body≫
Next, a method for assembling the control unit main body 22 and the heat radiating plate 24 to the case main body 40B will be described.

<Assembly of control unit body>
After aligning the four projecting bodies 60 of the case main body 40B and the control unit main body 22 (see FIG. 7), the control unit main body 22 is pushed into the intermediate wall 41 side (see FIG. 8, arrow A3). Then, in each projecting body 60, at least one of the “first arm portion 71, the coupling portion 72, and the second arm portion 73” having elasticity (flexibility) bends against the elasticity, and the second The arm 73 opens outward (left side in FIG. 8).
Thereafter, the front end of the stopper 81 comes into contact with the back surface of the substrate 22A. At the same time, the second engaging portion 73c is engaged with the front side of the substrate 22A, the third engaging portion 82 is engaged with the outer peripheral edge of the substrate 22A, and the control unit main body 22 is assembled to the case main body 40B (FIG. 9). reference).

<Assembly of heat sink>
Next, silicone S is applied to the front surface of the electronic component 22 </ b> B constituting the control unit main body 22. Then, after aligning the four projecting bodies 60 and the heat sink 24 (see FIG. 7), the heat sink 24 is pushed into the intermediate wall 41 (see arrow A4 in FIG. 8).
Then, in each projecting body 60, at least one of the “first arm portion 71, the coupling portion 72, and the second arm portion 73” having elasticity (flexibility) bends against the elasticity, and the second The arm 73 opens outward (left side in FIG. 8). Then, the edge of the heat sink 24 is inserted into the groove 73b. At the same time, the first engaging portion 73a engages with the front side of the heat sink 24, the second engaging portion 73c supports the heat sink 24 from the back side, and the heat sink 24 is assembled to the case body 40B (see FIG. 9).

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to each said embodiment, For example, the following changes can be made in the range which does not deviate from the meaning of this invention.

  In the reference example described above, the case main body 40A that accommodates the control unit main body 21 and the heat radiating plate 23 has been described, that is, the case where two electronic component plates are accommodated, but the number of electronic component plates is not limited thereto, It can be changed as appropriate. When changing the number of electronic component boards, the number of engaging claws constituting the protruding body is changed correspondingly.

  In the first embodiment described above, the case where the second arm portion 73 is extended from the tip of the first arm portion 71 toward the intermediate wall surface 41 a has been described, but the second arm portion 73 is the first arm portion 71. The structure extended toward the intermediate wall surface 41a from the middle position may be sufficient.

  In each of the above-described embodiments, the case where the protruding bodies 42 and 60 are formed integrally with the intermediate wall 41 of the case main bodies 40A and 40B has been described, but the present invention is not limited to this. That is, for example, as illustrated in FIG. 10, the protruding body 42 on the upper side from the pedestal portion 43 and the intermediate wall 41 may be configured separately. In such a case, the projecting body 42 may be configured to be separately fitted and fixed to the intermediate wall 41 (see arrow A5) or to be joined. Incidentally, when the protruding body 60 is a separate body (see FIGS. 8 and 9), the upper side from the pedestal portion 90 may be configured separately.

It is a disassembled perspective view of the brake fluid pressure control device for vehicles concerning a reference example. It is a disassembled perspective view of the control unit shown in FIG. It is XX sectional drawing of the control unit case after accommodation of a control unit main body and a heat sink. It is XX expanded sectional drawing of the protrusion body before the assembly | attachment of a control unit main body and a heat sink. It is a schematic diagram for demonstrating the structure of the protrusion body shown in FIG. It is XX expanded sectional drawing of the protrusion body after the assembly | attachment of a control unit main body and a heat sink. It is a disassembled perspective view of the control unit which concerns on 1st Embodiment. It is YY sectional drawing of the protrusion body before the assembly | attachment of a control unit main body and a heat sink. It is YY sectional drawing of the protrusion body after the assembly | attachment of a control unit main body and a heat sink. It is sectional drawing which shows the relationship between the protruding body and intermediate wall which concern on a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle brake hydraulic pressure control apparatus 11 Electric motor 12 Base body 20 Control unit 21, 22 Control unit main body (electronic component board)
23, 24 Heat sink (electronic component board)
30 Control unit case (electronic component board storage box)
40A, 40B Case body (box body)
41 Middle wall (box wall)
41a Intermediate wall surface (inner wall surface)
42, 60 Projecting body 44 Arm 44A Arm body (support member body)
44B 1st engagement nail (engagement part)
44C 2nd engaging claw (engaging part)
70 1st protrusion body 71 1st arm part (support member main body)
72 Connecting part (connecting part)
73 2nd arm part 73a 1st engaging part 73b Groove part 73c 2nd engaging part (other surface side support part)
80 Second projecting body 81 Stopper (other surface side support part)

Claims (4)

An electronic component plate housing box that accommodates inside a control unit body having electronic components and a heat radiating plate disposed outside the control unit body and thermally connected to the electronic components via a silicone film. And
The box body,
A first arm formed to protrude from the inner wall surface of the box body;
A first engagement portion that extends obliquely from the first arm portion toward the inner wall surface side, engages with one surface side of the heat radiating plate, and engages with one surface side of the control unit main body. A second arm portion having two engaging portions;
With
The first arm part and the second arm part are provided as a pair so as to face each other in the surface direction of the control unit main body and the heat radiating plate,
The heat radiating plate is engaged between the pair of opposing first engaging portions by sandwiching the heat radiating plate from the surface direction, and the control unit main body is sandwiched between the pair of opposing second engaging portions from the surface direction. To engage,
At least a part of the first arm portion, the second arm portion, and the connecting portion between the first arm portion and the second arm portion has elasticity,
When the first engaging portion is engaged with the heat radiating plate and the second engaging portion is engaged with the control unit main body, the electronic component and the heat radiating plate are thermally connected via the silicone film. In addition, the electronic component board storage box is characterized in that the control unit main body and the heat radiating plate are snap-coupled to the second arm portion. In the surface direction of the control unit main body and the heat radiating plate , it is formed so as to protrude from the inner wall surface inside the first arm portion, and includes an other surface side support portion that supports the control unit main body from the other surface side. The electronic component board storage box according to claim 1. The electronic component board storage box according to claim 2, wherein the control unit main body is sandwiched in the thickness direction by the second engaging portion and the other surface side support portion. The portion to be sandwiched by a pair of said second arm portion of the control unit main body and the heat radiating plate, that notches for regulating the movement in the plane direction of the control unit body and the heat radiating plate is formed The electronic component board storage box of any one of Claims 1-3 characterized by the above-mentioned.

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