Resin molded part, method for manufacturing resin molded part, and hydraulic control device

Abstract

A resin molded part has an interior space. The resin molded part includes a ventilation channel defined so as to connect the interior space with the exterior of the resin molded part. The ventilation channel includes a first ventilation channel extending from the interior space in a predetermined direction to include a bottom portion; and a second ventilation channel extending from the exterior in a direction intersecting the predetermined direction. The first ventilation channel and the second ventilation channel are connected to each other by connecting the bottom portion to a bifurcated portion provided at the end of the second ventilation channel. The portion where the first and second ventilation channels connect to each other is the narrowest portion of the ventilation channel.

Description

Technical Field

[0001] The present disclosure relates to a resin molded part, a method for manufacturing the resin molded part, and a hydraulic control device. Background Art

[0002] Conventionally, there is proposed an electronic control unit suitable for vehicle wiring harnesses, etc. The electronic control unit includes a substrate, a case (so-called resin molding) accommodating the substrate in a sealed internal space, and a connector penetrating the case and connected to the substrate.

[0003] Generally, since the electronic control unit is electrically connected to a mating component via a connector, heat may be generated in the substrate. Since the substrate is housed in the enclosed internal space of the housing as described above, the heat generated in the substrate causes a temperature difference between the internal space of the housing and the outside of the housing. In this way, when a temperature difference occurs between the internal space of the housing and the outside of the housing, pressure may be applied to the internal space of the housing. As a method for releasing the pressure applied to the internal space of the housing, in the electronic control unit of the prior art, for example, the housing is provided with a ventilation portion (so-called ventilation channel) that communicates the internal space of the housing with the outside of the housing (for example, see Patent Documents 1 and 2).

[0004] However, when the housing is provided with a vent as described above, liquid such as rainwater may penetrate into the interior space of the housing through the vent. Therefore, in Patent Document 2, a waterproof filter is provided in an opening on the interior space side of the housing to prevent liquid from penetrating into the interior space of the housing through the vent.

[0005] Patent Document 1: JP-A-2010-052613

[0006] Patent Document 2: JP-A-2019-008917 Summary of the Invention

[0007] However, not only can liquids penetrate the interior space of the housing through the ventilation portion, but insects (e.g., ants) can also infiltrate the interior space of the housing through the ventilation portion. In this manner, when insects intrude into the interior space of the housing, the waterproof filter may be damaged by the insects. If the waterproof filter is damaged by insect intrusion, the waterproof performance of the electronic control unit will be impaired.

[0008] Therefore, as a method to prevent insects from invading the interior space of the above-mentioned housing, a method of reducing the size of the ventilation portion can also be considered. However, due to the need to ensure the ventilation rate of the ventilation portion, it is difficult to make the ventilation portion extremely small. As another method, a method of adding an insect repellent component to the opening of the ventilation portion can be considered, but this method will increase the manufacturing cost of the electronic control unit (i.e., the housing) due to the increase in the number of components and complicate the manufacturing steps of the electronic control unit (i.e., the housing).

[0009] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a resin molded part, a method for manufacturing the resin molded part, and a hydraulic control device that can prevent insect invasion without increasing the number of components.

[0010] The present disclosure provides a resin molded part having an internal space, the resin molded part including: a ventilation channel defined so as to communicate the internal space with the outside of the resin molded part, wherein the ventilation channel includes: a first ventilation channel extending from the internal space along a predetermined direction to include a bottom; and a second ventilation channel extending from the outside along a direction intersecting the predetermined direction, wherein the first ventilation channel and the second ventilation channel are communicated with each other by communicating the bottom with a bifurcation provided at an end of the second ventilation channel, and wherein the portion where the first ventilation channel and the second ventilation channel communicate with each other is the narrowest portion of the ventilation channel.

[0011] The present disclosure provides a method for manufacturing the above-mentioned resin molded part, which uses a first mold, a second mold and a third mold, wherein the second mold is separated from and adjacent to the first mold, and at least a portion of the third mold is located between the first mold and the second mold, wherein the first mold includes a protrusion protruding toward the second mold, and the third mold includes a fork portion at the end of at least the portion located between the first mold and the second mold, and the manufacturing method includes: bringing the protrusion into contact with the two forks to hold the third mold between the first mold and the second mold; injecting resin into the space defined by the first mold, the second mold and the third mold; pulling the third mold out from between the first mold and the second mold to define the second ventilation channel; and removing the first mold from the second mold to define the first ventilation channel.

[0012] The present disclosure provides a hydraulic control device, comprising: a metal housing having an oil passage formed therein; and a resin molded part arranged on one surface of the metal housing, wherein the resin molded part accommodates a substrate in a substrate accommodating portion provided inside the resin molded part, the substrate being configured to control the hydraulic pressure in the oil passage, wherein in the resin molded part, an electric control component is arranged in a device accommodating portion formed between the metal housing and the substrate accommodating portion, the electric control component being configured to control the hydraulic pressure in the oil passage, wherein in the resin molded part, a ventilation passage is defined so that the substrate accommodating portion communicates with the outside of the resin molded part, wherein the resin molded part includes a filter configured to allow the liquid to pass through the device accommodating portion. The filter is configured to allow gas to pass through the filter and is unable to pass through the filter, wherein the ventilation channel comprises: a first ventilation channel extending from the substrate accommodating portion in a predetermined direction to include a bottom; and a second ventilation channel extending from the outside in a direction intersecting the predetermined direction, wherein the first ventilation channel and the second ventilation channel are connected to each other by connecting the bottom with a bifurcation provided at an end of the second ventilation channel, wherein the portion where the first ventilation channel and the second ventilation channel are connected to each other is the narrowest portion of the ventilation channel, wherein each of the bifurcation portions is narrower than the first ventilation channel, and wherein the filter is configured to cover the opening of the first ventilation channel on the substrate accommodating portion side.

[0013] The present disclosure is briefly described above. The details of the present disclosure will be further clarified by reading the following configuration for implementing the invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a perspective view showing a hydraulic control device according to an embodiment of the present disclosure;

[0015] Figure 2 It is along Figure 1 A cross-sectional view taken along line AA in FIG.

[0016] Figure 3 A is a perspective view of a resin molded article according to a first embodiment of the present disclosure as viewed from the upper side, and Figure 3 B is a perspective view of the resin molded article according to the first embodiment of the present disclosure as viewed from the lower side;

[0017] Figure 4 A is along Figure 3 A perspective view of a section taken along line BB of FIG. 1 , and Figure 4 B is Figure 4 Enlarged view of portion D in A;

[0018] Figure 5 It is along Figure 3 B is an enlarged view of the communicating portion in the cross section taken along line CC;

[0019] Figure 6 It is along Figure 3 B is an enlarged view of the communicating portion in the cross section taken along line EE;

[0020] Figure 7 A is a view showing a method of manufacturing a resin molded part according to the present embodiment, which corresponds to the following Figure 3 The section taken by line BB in B, and Figure 7 B is a perspective view of the first component and the third component viewed from the upper side;

[0021] Figure 8 A is a view showing a method of manufacturing a resin molded part according to a second embodiment of the present disclosure, which corresponds to Figure 7 B, and Figure 8 B is a resin molded part according to the second embodiment corresponding to Figure 5 ; and

[0022] Figure 9 A is a view showing a method of manufacturing a resin molded part according to a third embodiment of the present disclosure, which corresponds to Figure 7 B, and Figure 9 B is a resin molded part according to the third embodiment corresponding to Figure 5 view. DETAILED DESCRIPTION

[0023] <First embodiment>

[0024] like Figure 1 As shown, the hydraulic control device 7 includes a resin molded part 1 and an actuator unit 2. Figures 1 to 3 B (especially Figure 3 As shown in Figures 3A and 3B, the resin molded part 1 is a resin molded part that integrally includes a connector portion 10, a substrate housing portion 20, and a device housing portion 30. The resin molded part 1 is used, for example, as part of an anti-lock braking system (ABS) unit for a vehicle. In this case, for example, the solenoid coil 5a included in the hydraulic valve 5 is housed in the device housing portion 30. The resin molded part 1 is fixed to the actuator unit 2 by bolts or the like (not shown).

[0025] For the convenience of description, Figure 1 and Figure 9B, "up," "down," "front," "back," "right," and "left" are defined. As used herein, the upper-lower direction is also referred to as the "up-down direction," and the left-right direction is also referred to as the "width direction." The upper-lower direction, the width direction, and the front-back direction are orthogonal to each other.

[0026] The resin molded article 1 is attached to a counterpart (not shown) located on the upper side of the resin molded article 1 by approaching upward toward the counterpart in the up-down direction. The "attaching direction" of the present disclosure coincides with the up-down direction.

[0027] like Figure 3 A. Figure 3 B. Figure 4 A and Figure 4 As shown in FIG. 2B , the resin molded article 1 includes a flat plate-shaped base plate 40 located approximately in the center of the resin molded article 1 in the vertical direction. A generally rectangular cylindrical frame body protruding upward is provided on the front portion of the upper surface of the base plate 40, serving as the side wall 11 of the connector portion 10. The area of ​​the base plate 40 surrounded by the side wall 11 constitutes the inner wall 12 of the connector portion 10.

[0028] A cylindrical frame protruding downward is provided on the lower surface of the peripheral portion of the substrate 40 as the side wall 21 of the substrate storage portion 20 . In other words, the substrate 40 also serves as the inner wall 22 of the substrate storage portion 20 .

[0029] A substantially rectangular cylindrical frame protruding upward is provided at the rear of the upper surface of the bottom plate 40 as a side wall 31 of the device storage section 30, spaced from the rear side of the side wall 11. The area of ​​the base plate 40 surrounded by the side wall 31 constitutes an inner wall 32 of the device storage section 30.

[0030] The rear side wall of the resin molded part 1 is formed by integrally molding the side wall 21 of the substrate housing portion 20 and the side wall 31 of the device housing portion 30. An opening 81 of a ventilation passage V (second ventilation passage 80), described later, is provided in the rear side wall of the resin molded part 1 approximately in the center in the vertical direction.

[0031] On the inner wall 12 of the connector portion 10, a plurality of terminals 50 extending linearly in the vertical direction are press-fitted and fixedly passed through a plurality of through holes (not shown) that extend vertically through the inner wall 12. That is, the lower end portion of each terminal 50 is exposed at the substrate receiving portion 20, and the upper end portion of each terminal 50 is exposed at the connecting portion 10.

[0032] When a mating connector (not shown) is fitted into the connector portion 10 (specifically, a fitting chamber defined by the side walls 11 and the inner wall 12 ), terminals (female terminals, not shown) provided in the mating connector and the terminals 50 are electrically connected to each other.

[0033] At each of a plurality of locations on the inner wall 32 of the device accommodating portion 30, a terminal insertion hole 33 (through hole) is formed to allow insertion of a pair of leaf spring-shaped terminals 5c protruding downward from the lower end portion of the solenoid coil 5a (see FIG. Figure 2 ).

[0034] For example, the substrate 4 is accommodated and fixed in the substrate accommodation portion 20. When the substrate 4 is fixed, the lower end portion of each of the plurality of terminals 50 is fixed to the substrate 4 in a state of passing through each of the plurality of through holes (not shown) that penetrate the substrate 4 in the vertical direction. As a result, the terminals 50 and the substrate 4 are electrically connected to each other.

[0035] In the resin molded article 1, when the substrate 4 is housed in the substrate housing portion 20, the substrate 4 becomes a lid covering the substrate housing portion 20. As a result, the substrate housing portion 20 and the substrate 4 define an internal space S in the resin molded article 1.

[0036] In the device accommodating portion 30 , a plurality of solenoid coils 5 a are accommodated and fixed so that the leaf spring-shaped terminals 5 c protruding downward from the solenoid coils 5 a pass through the terminal insertion holes 33 and then are exposed at the substrate accommodating portion 20 .

[0037] The lower end of each leaf spring terminal 5c exposed in the substrate accommodating portion 20 is in pressure contact with the upper surface of the substrate 4. Thus, each solenoid coil 5a is electrically connected to a mating connector mounted on the connector portion 10 via the substrate 4.

[0038] The solenoid coil 5a has a cylindrical shape and houses a rod-shaped plunger 5b in its inner space so as to be relatively movable in the vertical direction relative to the solenoid coil 5a by electromagnetic force generated by the solenoid coil 5a. The solenoid coil 5a and the plunger 5b constitute the hydraulic valve 5.

[0039] The actuator unit 2 for ABS control is mounted to the upper end surface of the side wall 31 of the device accommodating portion 30 to close the opening of the device accommodating portion 30. This mounting is performed by bolt fastening using a plurality of bolt fastening holes (not shown) provided in the side wall 31, for example.

[0040] Although not shown, the actuator unit 2 includes a plurality of valve seat portions of the hydraulic valve 5 , a pump for pumping hydraulic oil stored in a reservoir, etc. in a built-in manner, and a motor 3 for driving the pump is mounted on an upper surface of the actuator unit 2 .

[0041] The upper end of the plunger 5b housed in each solenoid coil 5a is inserted into the valve seat portion of the hydraulic valve 5 in the actuator unit 2. By controlling the vertical position of the plunger 5b using the electromagnetic force generated by each solenoid coil 5a, the opening and closing of the corresponding hydraulic valve 5 are controlled, and well-known ABS control is performed.

[0042] Briefly describing ABS control, when the slip ratio of a particular wheel exceeds a predetermined value, the hydraulic valve 5 corresponding to that wheel is controlled, reducing the brake fluid pressure corresponding to that wheel from the fluid pressure corresponding to the brake pedal force generated by the vehicle's master cylinder. As a result, the wheel's slip ratio is adjusted to fall below the predetermined value. The hydraulic oil returned to the reservoir upon reduction in brake fluid pressure is pumped by a pump driven by the engine 3 and returned to the vehicle's master cylinder.

[0043] like Figure 4 A, 4B and Figure 5 As shown, the inner wall 22 of the substrate receiving portion 20 is provided with a generally cylindrical recess 23 that is recessed upward. The recess 23 includes a bottom wall 24 and a peripheral wall 25. The bottom wall 24 is provided with an opening 71 of a first ventilation passage 70 to be described later. The filter 60 to be described later is provided at the lower end of the peripheral wall 25.

[0044] like Figure 3 A. Figure 3 B. Figure 4 A and Figure 4 As shown in FIG. 2B , in the resin molded part 1, a filter 60 having a substantially circular shape is provided at the lower end portion of the peripheral wall 25 so as to cover the opening 71 of the first ventilation passage 70. The filter 60 is attached to the lower end portion of the peripheral wall 25 by, for example, welding. As the filter 60, various types of materials that are impermeable to liquids such as water but permeable to gases such as air can be used, such as porous membranes, microporous membranes, and microporous structure materials.

[0045] In the resin molded part 1, a ventilation channel V is defined in the base plate 40, which connects the interior space S with the exterior of the resin molded part 1. The ventilation channel V includes a first ventilation channel 70 extending in the vertical direction from the interior space S, and a second ventilation channel 80 extending in the front-to-back direction from the exterior of the resin molded part 1. In this embodiment, the vertical direction corresponds to a predetermined direction, and the front-to-back direction corresponds to a direction intersecting the predetermined direction.

[0046] like Figure 4 A, 4B and Figure 5 As shown, the first ventilation passage 70 extends from the inner wall 22 of the substrate receiving portion 20 (ie, the inner space S) toward the upper side in the up-down direction to include a bottom 72. The first ventilation passage 70 has a substantially rectangular parallelepiped shape (see FIG. Figure 5 ).like Figure 5 As shown, the first ventilation passage 70 is configured to have a length in the width direction that is longer than a length of the bottom portion 72 in the width direction.

[0047] The second ventilation passage 80 extends from the rear side wall of the resin molded part 1 (ie, the outside of the resin molded part 1) to the front side in the front-to-rear direction. The second ventilation passage 80 has a substantially rectangular parallelepiped shape (see FIG. Figure 4 A and 4B).

[0048] A bifurcated portion 84 is provided at the front end portion of the second ventilation passage 80. The bifurcated portion 84 includes a first portion 82 having a substantially rectangular parallelepiped shape extending in the front-to-rear direction and a second portion 83 having a substantially rectangular parallelepiped shape extending in the front-to-rear direction. In the bifurcated portion 84, the first portion 82 and the second portion 83 are spaced apart from each other in the width direction by a predetermined interval.

[0049] Each of the first portion 82 and the second portion 83 is configured to be narrower than the first ventilation passage 70. Specifically, the passage area of ​​each of the first portion 82 and the second portion 83 is smaller than the passage area of ​​the first ventilation passage 70. The passage area refers to the cross-sectional area obtained by cutting the ventilation passage V along a plane perpendicular to the axis of the ventilation passage V, which is the direction of airflow. However, since the communication portion C, as described later, is a substantially rectangular hole elongated in the front-to-back direction, the area of ​​the communication portion C is equal to the passage area.

[0050] In the ventilation channel V, in particular Figure 5 As shown, the bottom portion 72 of the first ventilation passage 70 and the bifurcated portion 84 of the second ventilation passage 80 are connected to each other, so that the first ventilation passage 70 and the second ventilation passage 80 are connected to each other. Specifically, the lower left edge of the first portion 82 and the upper right edge of the space of the first ventilation passage 70 including the bottom portion 72 are connected to each other in the vertical direction, so that the space of the first portion 82 slightly overlaps the space of the first ventilation passage 70 in the width direction.

[0051] Similarly, the lower right edge of the second portion 83 and the upper left edge of the space of the first ventilation passage 70 including the bottom 72 communicate with each other in the vertical direction so that the space of the second portion 83 slightly overlaps the space of the first ventilation passage 70 in the width direction.

[0052] In this way, in the ventilation channel V, the space of the first ventilation channel 70 and the respective spaces of the first part 82 and the second part 83 slightly overlap with each other, thereby forming a connecting portion C in which the bottom 72 of the first ventilation channel 70 and the fork portion 84 of the second ventilation channel 80 are connected to each other in the up and down directions.

[0053] like Figure 6 As shown, each communication portion C has a length in the front-to-back direction and a length in the width direction. The communication portion C is a hole of a substantially rectangular shape elongated in the front-to-back direction (see Figure 6). That is, the connecting portion C is configured so that the length L1 in the front-to-back direction is longer than the length L2 in the width direction. The connecting portion C is preferably designed so that the length of its short side (in this embodiment, the length L2 in the width direction) is 0.25 mm or less. For example, when the length L1 in the front-to-back direction and the length L2 in the width direction are equal (that is, the connecting portion C is a substantially square hole), it is preferred that the length L1 in the front-to-back direction and the length L2 in the width direction are both designed to be 0.25 mm or less.

[0054] In other words, the connecting portion C on the right side (see Figure 6 ) is a gap in the width direction between the upper corner 73a of the side wall 73 and the right corner 72a of the bottom 72 that defines the first ventilation passage 70. The connecting portion C on the left (see Figure 6 ) is a gap in the width direction between the upper corner portion 74 a of the side wall 74 defining the first ventilation passage 70 and the left corner portion 72 b of the bottom portion 72 .

[0055] The communicating portion C is configured to be the narrowest in the ventilation passage V. Specifically, the communicating portion C is configured to have the smallest channel area among the channel areas in the ventilation passage V, and is also configured in a shape such that insects (especially ants) that invade the second ventilation passage 80 cannot invade the first ventilation passage 70 (i.e., the internal space S).

[0056] With the above structure, the resin molded article 1 can prevent insect invasion by narrowing the communication portion C between the first ventilation passage 70 and the second ventilation passage 80 while ensuring the ventilation volume in the ventilation passage V. The above is the description of the resin molded article 1 according to the first embodiment.

[0057] Next, a method for manufacturing the resin molded article 1 according to the first embodiment will be described. Figure 7 As shown in Figure A, a resin molded part 1 is manufactured using a first mold 91, a second mold 92 and a third mold 93, wherein the second mold 92 is separated from the first mold 91 and is adjacent to the first mold 91 in the up and down directions, and the third mold 93 includes at least a portion located between the first mold 91 and the second mold 92.

[0058] The first mold 91 includes a protrusion 91a that protrudes toward the second mold 92 (ie, upward in the vertical direction). The protrusion 91a has a substantially rectangular parallelepiped shape extending in the vertical direction and defines the first ventilation passage 70 through a manufacturing step described later.

[0059] The third mold 93 includes a bifurcated portion 93a at the front end of the portion located between the first mold 91 and the second mold 92. The length between one bifurcated portion 93a of the third mold 93 and the other bifurcated portion 93a of the third mold 93 is shorter than the widthwise length of the protrusion 91a. The portion of the third mold 93 located between the first mold 91 and the second mold 92 has a generally rectangular parallelepiped shape extending in the front-to-back direction and defines the second ventilation passage 80 through the manufacturing steps described later. Similarly, the bifurcated portion 93a of the third mold 93 defines the bifurcated portion 84 of the second ventilation passage 80 through the manufacturing steps described later. The length of each bifurcated portion 93a in the front-to-back direction corresponds to the length of the protrusion 91a in the front-to-back direction.

[0060] In the method for manufacturing the resin molded article 1, first, the protrusion 91a is brought into contact with the two forked portions 93a, and the third mold 93 is held between the first mold 91 and the second mold 92. Specifically, as Figure 7 As shown in FIG. 2B , the third mold 93 is arranged so that the right edge of the lower surface of the left fork portion 93a and the left edge of the upper surface of the protrusion 91a contact each other in the width direction so that the fork portion 93a and the protrusion 91a slightly contact each other, and the left edge of the lower surface of the right fork portion 93a and the right edge of the upper surface of the protrusion 91a contact each other in the width direction so that the fork portion 93a and the protrusion 91a slightly contact each other. These contact portions have a generally rectangular shape that is elongated in the front-to-back direction.

[0061] As described above, by slightly contacting the protrusion 91a with the bifurcated portion 93a, the space of the first ventilation passage 70 slightly overlapping with the first portion 82 and the space of the first ventilation passage 70 slightly overlapping with the second portion 83 will be defined in the steps described later. In other words, the contact portion between the protrusion 91a and the bifurcated portion 93a forms the communication portion C between the first ventilation passage 70 and the second ventilation passage 80.

[0062] Subsequently, the resin material 94 is injected into the space defined by the first mold 91, the second mold 92, and the third mold 93. The hot-melt resin material 94 is uniformly injected into the above-mentioned space, and then the resin material 94 is cooled and solidified.

[0063] Subsequently, the third mold 93 is slid backward and pulled out from between the first mold 91 and the second mold 92. As a result, the second ventilation channel 80 is defined. Subsequently, the first mold 91 is removed from the second mold 92. As a result, the first ventilation channel 70 is defined and the substrate accommodating portion 20 is formed. Subsequently, the second mold 92 is removed from the resin material 94. As a result, the connector portion 10 and the device accommodating portion 30 are formed. As a result, the resin molded part 1 according to the first embodiment is obtained. The step of removing the mold after injecting the resin material 94 is not limited to the above order.

[0064] In the manufacturing method of the resin molded part 1 of the present embodiment, as described above, the contact portion between the protrusion 91a and the bifurcated portion 93a is formed by bringing the surfaces into contact with each other in the up and down directions (i.e., formed by fitting the surfaces). For example, in the case where the contact portion between the protrusion 91a and the bifurcated portion 93a is formed by its corners, when the resin material 94 is injected as described later, the resin material 94 moves at high speed within the space into which the resin material is injected, and thus may collide with the mold (i.e., the mold is pushed by the resin material 94). As a result, force is concentrated on the corners forming the contact portion, which may cause damage to the mold, such as scratches on the corners. However, in the present embodiment, since the surfaces are brought into contact with each other, damage to the mold as described above can be prevented.

[0065] Furthermore, for example, when attempting to define the first ventilation channel 70 and the second ventilation channel 80 using a single mold, the thickness of the portion of the mold defining the communication portion C is thin. Therefore, similar to the above, there is a risk that the thin portion of the mold may be damaged. However, in the method for manufacturing the resin molded part 1 of this embodiment, since the ventilation channel V is defined by multiple molds, the aforementioned damage to the mold can be prevented.

[0066] The above is the description of the method for manufacturing the resin molded article 1 according to the first embodiment.

[0067] <Second embodiment>

[0068] Next, a resin molded article 1 according to a second embodiment will be described. The first and third molds used to manufacture the resin molded article 1 differ between the second embodiment and the first embodiment. Consequently, the shape of the ventilation passage V also differs between the second and first embodiments. Since the second and first embodiments are configured identically except for the aforementioned points, description of similarly configured points will be omitted. Below, the second embodiment will be described.

[0069] like Figure 8 As shown in FIG. 1A , similar to the first mold 91 , the first mold 191 includes a protrusion 191 a protruding toward the second mold (not shown). Compared with the protrusion 91 a, the protrusion 191 a protrudes further upward.

[0070] The third mold 193 includes a bifurcated portion 193a at the front end of the portion located between the first mold 191 and the second mold. The length between one bifurcated portion 193a of the third mold 193 and the other bifurcated portion 193a of the third mold 193 is equal to the length in the width direction of the protrusion 191a. The thickness of each bifurcated portion 193a is smaller than the thickness of the portion of the third mold 193 located between the first mold 191 and the second mold, excluding the bifurcated portion 193a of the third mold 193.

[0071] In the manufacturing method of the resin molded article 1 according to the second embodiment, similarly to the first embodiment, the protrusion 191a is brought into contact with the two forked portions 193a, and then the third mold 193 is held between the first mold 191 and the second mold. In this case, in the second embodiment, the contact method between the protrusion 191a and the forked portions 193a is different from that in the first embodiment.

[0072] Specifically, in the second embodiment, the third mold 193 is arranged so that the lower edge of the right surface of the left fork portion 193a and the upper edge of the left surface of the protrusion 191a contact each other in the vertical direction, so that the fork portion 193a and the protrusion 191a slightly contact each other, and the lower edge of the left surface of the right fork portion 193a and the upper edge of the right surface of the protrusion 191a contact each other in the vertical direction, so that the fork portion 93a and the protrusion 91a slightly contact each other. In other words, the fork portion 193a is arranged so as to sandwich the protrusion 191a. These contact portions have a generally rectangular shape that is elongated in the front-to-back direction.

[0073] Since the subsequent steps are the same as those in the first embodiment, description thereof will be omitted.

[0074] As described above, by slightly contacting protrusion 191a with bifurcated portion 193a, the space of first ventilation channel 170 slightly overlapping with first portion 182 (to be described later) and the space of first ventilation channel 170 slightly overlapping with second portion 183 will be defined in subsequent steps. In other words, the contact portion between protrusion 191a and bifurcated portion 193a forms a connecting portion between first ventilation channel 170 and second ventilation channel 180 (to be described later).

[0075] like Figure 8 As shown in FIG. 1B , the ventilation passage V includes a first ventilation passage 170 and a second ventilation passage 180 . Similar to the first embodiment, the first ventilation passage 170 extends from the inner wall 22 of the substrate receiving portion 20 (ie, the inner space S) toward the upper side in the vertical direction to include a bottom 172 .

[0076] Similar to the first embodiment, the second ventilation duct 180 extends from the rear sidewall of the resin molded part 1 (i.e., the exterior of the resin molded part 1) toward the front in the front-to-back direction. A bifurcated portion 184 is provided at the front end of the second ventilation duct 180, comprising a first portion 182 and a second portion 183. In the bifurcated portion 184, the first portion 182 and the second portion 183 are separated from each other in the width direction by a predetermined gap. This predetermined gap is the length between one bifurcated portion 193a of the third mold 193 and the other bifurcated portion 193a of the third mold 193.

[0077] Each of the first portion 182 and the second portion 183 is configured to be narrower than the first ventilation passage 170. Specifically, a passage area of ​​each of the first portion 182 and the second portion 183 is smaller than a passage area of ​​the first ventilation passage 170.

[0078] In the ventilation passage V, the bottom portion 172 of the first ventilation passage 170 and the bifurcated portion 184 of the second ventilation passage 180 are in communication with each other, so that the first ventilation passage 170 and the second ventilation passage 180 are in communication with each other. Specifically, the lower edge of the left portion of the first portion 182 and the upper edge of the right portion of the space of the first ventilation passage 170 including the bottom portion 172 are in communication with each other in the width direction, so that the space of the first portion 182 slightly overlaps the space of the first ventilation passage 170 in the vertical direction.

[0079] Similarly, the lower edge of the right portion of the second part 183 and the upper edge of the left portion of the space of the first ventilation passage 170 communicate with each other in the width direction so that the space of the second part 183 and the space of the first ventilation passage 170 slightly overlap in the vertical direction.

[0080] In this way, in the ventilation channel V, the space of the first ventilation channel 170 and the respective spaces of the first part 182 and the second part 183 slightly overlap with each other, thereby forming a connecting portion in which the bottom 172 of the first ventilation channel 170 and the fork portion 184 of the second ventilation channel 180 are connected to each other in the width direction.

[0081] Each connecting portion has a length in the front-to-back direction and a length in the up-to-down direction. The connecting portion is a hole having an elongated, roughly rectangular shape in the front-to-back direction. That is, the connecting portion is constructed so that its length in the front-to-back direction is longer than its length in the up-to-down direction. The connecting portion is preferably designed so that the length of its short side (in this embodiment, the length in the up-to-down direction) is less than 0.25 mm. For example, when the length in the front-to-back direction and the length in the up-to-down direction are equal (that is, the connecting portion is a hole having a roughly square shape), preferably, the length in the front-to-back direction and the length in the up-to-down direction are both designed to be less than 0.25 mm.

[0082] In other words, the right communication portion is a gap in the vertical direction between the upper corner 173a of the side wall 173 and the right corner 172a of the bottom 172 that defines the first ventilation passage 170. The left communication portion is a gap in the vertical direction between the upper corner 174a of the side wall 174 and the left corner 172b of the bottom 172 that defines the first ventilation passage 170.

[0083] Similar to the first embodiment, each connecting portion between the first ventilation passage 170 and the second ventilation passage 180 is configured to be the narrowest within the ventilation passage V. Specifically, the connecting portion is configured to have the smallest channel area among the channel areas within the ventilation passage V, and is also shaped to prevent insects (particularly ants) that invade the second ventilation passage 180 from invading the first ventilation passage 170 (i.e., the interior space S). Compared to the ventilation passage V of the first embodiment, the ventilation passage V of the second embodiment is smaller in the vertical direction and larger in the width direction. In this way, the shape of the ventilation passage V of the second embodiment differs from that of the first embodiment.

[0084] The above is the description of the second embodiment. As described above, description of points constructed in the same manner as the first embodiment is omitted.

[0085] <Third embodiment>

[0086] Next, a resin molded article 1 according to a third embodiment will be described. The first and third molds used to manufacture the resin molded article 1 differ between the third embodiment and the first embodiment. Consequently, the shape of the ventilation passage V also differs between the third embodiment and the first embodiment. Since the third embodiment and the first embodiment are configured identically except for the aforementioned points, description of similarly configured points will be omitted. Below, the third embodiment will be described.

[0087] like Figure 9 As shown in FIG. 2A , similar to the first mold 91 , the first mold 291 includes a protrusion 291 a protruding toward the second mold (not shown). Compared with the protrusion 91 a, the protrusion 291 a protrudes further upward.

[0088] The third mold 293 includes a bifurcation 293a at the front end of the portion located between the first mold 291 and the second mold. Each bifurcation 293a includes an extension 293b. Specifically, one bifurcation 293a (left bifurcation 293a) includes an extension 293b that extends from the surface facing the other bifurcation 293a (i.e., the right surface) toward the other bifurcation 293a (right bifurcation 293a) along the width direction, and the other bifurcation 293a (right bifurcation 293a) includes an extension 293b that extends from the surface facing one bifurcation 293a (i.e., the left surface) toward one bifurcation 293a (left bifurcation 293a) along the width direction. That is, each bifurcation 293a has a substantially L-shaped shape by including the extension 293b.

[0089] The length between one forked portion 293a of the third mold 293 and the other forked portion 293a of the third mold 293 (i.e., the length between one extension portion 293b and the other extension portion 293b) is equal to the widthwise length of the protrusion 291a. The thickness of each forked portion 293a is smaller than the thickness of the portion of the third mold 293 excluding the forked portion 293a and located between the first mold 291 and the second mold of the third mold 293.

[0090] In the method for manufacturing a resin molded part 1 according to the third embodiment, similar to the first embodiment, protrusion 291a is brought into contact with two forked portions 293a (i.e., extensions 293b), and then third mold 293 is held between first mold 291 and second mold 293. However, in the third embodiment, the contact between protrusion 291a and forked portions 293a differs from that in the first embodiment. Specifically, in the third embodiment, third mold 293 is arranged so that the free end surface of extension 293b of the left forked portion 293a and the upper edge of the left surface of protrusion 291a vertically contact each other, so that the forked portions 293a and protrusion 291a slightly contact each other, and the free end surface of extension 293b of the right forked portion 293a and the upper edge of the right surface of protrusion 291a vertically contact each other, so that the forked portions 293a and protrusion 291a slightly contact each other. In other words, extension 293b is arranged so as to sandwich protrusion 291a. These contact portions have a generally rectangular shape that is elongated in the front-rear direction.

[0091] Since the subsequent steps are the same as those in the first embodiment, description thereof will be omitted.

[0092] As described above, by slightly contacting the protrusion 291a with the bifurcated portion 293a, the space of the first ventilation channel 270 slightly overlapping with the first portion 282, which will be described later, and the space of the first ventilation channel 270 slightly overlapping with the second portion 283 will be defined in subsequent steps. In other words, the contact portion between the protrusion 291a and the bifurcated portion 293a forms a connecting portion between the first ventilation channel 270 and the second ventilation channel 280, which will be described later.

[0093] like Figure 9 As shown in FIG. 2B , the ventilation passage V includes a first ventilation passage 270 and a second ventilation passage 280 . Similar to the first embodiment, the first ventilation passage 270 extends upward from the inner wall 22 of the substrate receiving portion 20 (ie, the inner space S) to include a bottom 272 .

[0094] Similar to the first embodiment, the second ventilation duct 280 extends from the rear sidewall of the resin molded part 1 (i.e., the exterior of the resin molded part 1) toward the front in the front-to-back direction. A bifurcated portion 284 is provided at the front end of the second ventilation duct 280, comprising a first portion 282 and a second portion 283. In the bifurcated portion 284, the first portion 282 and the second portion 283 are separated from each other by a predetermined distance in the width direction. This predetermined distance is the length between one bifurcated portion 293a of the third mold 293 and the other bifurcated portion 293a of the third mold 293.

[0095] Each of the first portion 282 and the second portion 283 is configured to be narrower than the first ventilation passage 270. Specifically, a passage area of ​​each of the first portion 282 and the second portion 283 is smaller than a passage area of ​​the first ventilation passage 270.

[0096] In the ventilation passage V, the bottom portion 272 of the first ventilation passage 270 and the bifurcated portion 284 of the second ventilation passage 280 are in communication with each other, so that the first ventilation passage 270 and the second ventilation passage 280 are in communication with each other. Specifically, the left side of the portion extending in the width direction of the first portion 282 and the upper edge of the right portion of the space of the first ventilation passage 270 including the bottom portion 272 are in communication with each other in the width direction, so that the space of the first portion 282 slightly overlaps the space of the first ventilation passage 270 in the vertical direction.

[0097] Similarly, the right side of the portion extending in the width direction of the first portion 283 and the upper edge of the left portion of the space of the first ventilation passage 270 communicate with each other in the width direction, so that the space of the second portion 283 slightly overlaps the space of the first ventilation passage 270 in the vertical direction.

[0098] In this way, in the ventilation channel V, the space of the first ventilation channel 270 and the respective spaces of the first part 282 and the second part 283 slightly overlap with each other, thereby forming a connecting portion in which the bottom 272 of the first ventilation channel 270 and the fork portion 284 of the second ventilation channel 280 are connected to each other in the width direction.

[0099] Each connecting portion has a length in the front-to-back direction and a length in the up-to-down direction. The connecting portion is a hole having an elongated, roughly rectangular shape in the front-to-back direction. That is, the connecting portion is constructed so that its length in the front-to-back direction is longer than its length in the up-to-down direction. The connecting portion is preferably designed so that the length of its short side (in this embodiment, the length in the up-to-down direction) is less than 0.25 mm. For example, when the length in the front-to-back direction and the length in the up-to-down direction are equal (that is, the connecting portion is a hole having a roughly square shape), preferably, the length in the front-to-back direction and the length in the up-to-down direction are both designed to be less than 0.25 mm.

[0100] In other words, the right communication portion is the vertical gap between the upper corner portion 273a of the side wall 273 defining the first ventilation passage 270 and the portion 272a of the bottom 272 located on a virtual extension line extending from the upper corner portion 273a in the vertical direction. The left communication portion is the vertical gap between the upper corner portion 274a of the side wall 274 defining the first ventilation passage 270 and the portion 272b of the bottom 272 located on a virtual extension line extending from the upper corner portion 274a in the vertical direction.

[0101] Similar to the first embodiment, each connecting portion between the first ventilation passage 270 and the second ventilation passage 280 is configured to be the narrowest within the ventilation passage V. Specifically, the connecting portion is configured to have the smallest channel area among the channel areas within the ventilation passage V, and is also shaped to prevent insects (particularly ants) that invade the second ventilation passage 280 from invading the first ventilation passage 270 (i.e., the interior space S). Compared to the ventilation passage V of the first embodiment, the ventilation passage V of the third embodiment is smaller in the vertical direction, and compared to the ventilation passage V of the first and second embodiments, the ventilation passage V of the third embodiment is larger in the width direction. In this way, the shape of the ventilation passage V of the third embodiment differs from that of the ventilation passage V of the first embodiment.

[0102] The above is the description of the third embodiment. As described above, description of points configured in the same manner as the first embodiment is omitted.

[0103] <Functions and Effects>

[0104] According to the resin molded part 1 according to the present embodiment, the first ventilation passage 70 and the second ventilation passage 80 are communicated with each other by communicating the bottom portion 72 of the first ventilation passage 70 with the bifurcated portion 84 provided at the end portion of the second ventilation passage 80, and thus, the temperature difference and the pressure difference between the internal space S and the outside are reduced.

[0105] Furthermore, the resin molded article 1 is configured so that the portion where the first ventilation passage 70 and the second ventilation passage 80 communicate with each other is the narrowest portion in the ventilation passage V. That is, by narrowing the communication portion between the first ventilation passage 70 and the second ventilation passage 80 while ensuring the ventilation volume within the ventilation passage V, the resin molded article 1 also prevents insects from invading the internal space S of the resin molded article 1 through the ventilation passage V.

[0106] Furthermore, according to the resin molded article 1 of the present embodiment, since each branch portion 84 of the second ventilation passage 80 is configured to be narrower than the first ventilation passage 70 , the ventilation passage V can be miniaturized compared to a case where the above configuration is not employed.

[0107] Furthermore, according to the resin molded article 1 according to this embodiment, since the filter 60 that blocks liquid and allows gas to pass is provided to cover the opening 71 of the first ventilation passage 70, it is possible to prevent liquid from penetrating into the internal space S through the ventilation passage V. As a result, the resin molded article 1 is superior in waterproofness compared to a case where the filter 60 is not provided.

[0108] Furthermore, according to the method of manufacturing a resin molded article according to the present embodiment, the resin molded article 1 exhibiting the above-described effects can be manufactured only by using the first mold 91 , the second mold 92 , and the third mold 93 .

[0109] Therefore, the resin molded article 1 according to the present embodiment can prevent insect invasion without increasing the number of components. Similarly, the hydraulic control device 7 according to the present embodiment can prevent insect invasion without increasing the number of components.

[0110] Although the description is given with reference to the reference numerals of the first embodiment, the same effects can be obtained in the second and third embodiments.

[0111] <Other embodiments>

[0112] The present disclosure is not limited to the above-described embodiments and can be appropriately modified, improved, etc. In addition, as long as the present disclosure can be achieved, the materials, shapes, sizes, numbers, arrangement positions, etc. of the components of the above-described embodiments are optional and not limited.

[0113] For example, the protrusion (91a, 191a, 291a) is not limited to a substantially rectangular parallelepiped shape and may have a cylindrical shape.

[0114] Here, features of the embodiments of the resin molded article, the method for manufacturing the resin molded article, and the hydraulic control device according to the present disclosure described above will be briefly summarized and listed in the following [1] to [5].

[0115] [1] A resin molded article (1) having an internal space (S), the resin molded article (1) comprising:

[0116] a ventilation passage (V) defined so as to communicate the internal space with the outside of the resin molded part,

[0117] Wherein, the ventilation channel (V) includes:

[0118] a first ventilation passage (70, 170, 270) extending from the interior space in a predetermined direction to include a bottom portion (72, 172, 272); and

[0119] The second ventilation passage (80, 180, 280) extends from the outside in a direction intersecting the predetermined direction,

[0120] The first ventilation channel (70, 170, 270) and the second ventilation channel (80, 180, 280) are connected to each other by connecting the bottom (72, 172, 272) with a bifurcated portion (84, 184, 284) provided at the end of the second ventilation channel, and

[0121] The portion where the first ventilation channel (70, 170, 270) and the second ventilation channel (80, 180, 280) communicate with each other is the narrowest portion of the ventilation channel (V).

[0122] [2] The resin molded article (1) according to [1] above,

[0123] Each of the bifurcated portions (84, 184, 284) (the first portion 82, 182, 282, the second portion 83, 183, 283) is narrower than the first ventilation channel (70, 170, 270).

[0124] [3] The resin molded article (1) according to [1] or [2], further comprising:

[0125] a filter (60) configured to prevent liquid from passing through the filter and configured to allow gas to pass through the filter,

[0126] The filter (60) is arranged to cover the opening (71, 171, 271) of the first ventilation passage (70, 170, 270) on the inner space (S) side.

[0127] [4] A method for manufacturing a resin molded article according to any one of [1] to [3] above, the method using a first mold (91, 191, 291), a second mold (92), and a third mold (93, 193, 293), wherein the second mold (92) is separated from and adjacent to the first mold, and at least a portion of the third mold is located between the first mold and the second mold.

[0128] wherein the first mold (91, 191, 291) includes a protrusion (91a, 191a, 291a) protruding toward the second mold, and

[0129] The third mold (93, 193, 293) includes a bifurcation (93a, 193a, 293a) at an end portion of at least a portion between the first mold (91, 191, 291) and the second mold (92).

[0130] The manufacturing method includes:

[0131] bringing the protrusion (91a, 191a, 291a) into contact with the two forked portions (93a, 193a, 293a) to hold the third mold (93, 193, 293) between the first mold (91, 191, 291) and the second mold (92);

[0132] injecting a resin (resin material 94) into a space defined by the first mold (91, 191, 291), the second mold (92), and the third mold (93, 193, 293);

[0133] A third mold (93, 193, 293) is pulled out from between the first mold (91, 191, 291) and the second mold (92) to define a second ventilation channel (80, 180, 280); and the first mold (91, 191, 291) is removed from the second mold (92) to define a first ventilation channel (70, 170, 270).

[0134] [5] A hydraulic control device (7), comprising:

[0135] a metal housing (actuator unit 2) having an oil passage formed therein; and a resin molded part (1) arranged on one surface of the metal housing,

[0136] The resin molded part (1) accommodates a substrate (4) in a substrate accommodating portion (20) provided inside the resin molded part (1), and the substrate (4) is configured to control the hydraulic pressure in the oil passage.

[0137] wherein, in the resin molded part (1), an electric control component (hydraulic valve 5) is arranged in a device housing (30) formed between a metal housing (actuator unit 2) and a substrate housing (20), the electric control component being configured to control the hydraulic pressure in the oil passage,

[0138] wherein, in the resin molded part (1), a ventilation passage (V) is defined so that the substrate receiving portion (20) communicates with the outside of the resin molded part (1),

[0139] wherein the resin molded part (1) includes a filter (60) configured to prevent liquid from passing through the filter (60) and to allow gas to pass through the filter (60),

[0140] Wherein, the ventilation channel (V) includes:

[0141] a first ventilation passage (70, 170, 270) extending from the substrate receiving portion in a predetermined direction to include a bottom portion (72, 172, 272); and

[0142] a second ventilation passage (80, 180, 280) extending from the outside in a direction intersecting the predetermined direction,

[0143] The first ventilation channel (70, 170, 270) and the second ventilation channel (80, 180, 280) are connected to each other by connecting the bottom (72, 172, 272) with a bifurcated portion (84, 184, 284) provided at the end of the second ventilation channel (80, 180, 280).

[0144] The portion where the first ventilation channel (70, 170, 270) and the second ventilation channel (80, 180, 280) communicate with each other is the narrowest portion of the ventilation channel (V).

[0145] Each bifurcated portion (84, 184, 284) is narrower than the first ventilation channel (70, 170, 270), and

[0146] The filter is arranged to cover the opening of the first ventilation channel (70, 170, 270) on the substrate receiving portion (20) side.

[0147] A resin molded part having the structure of [1] described above will be described below. In the resin molded part, a ventilation channel is defined, the ventilation channel including a first ventilation channel and a second ventilation channel, the first ventilation channel extending from the interior space of the resin molded part in a predetermined direction to include a bottom, and the second ventilation channel extending from the exterior of the resin molded part in a direction intersecting the predetermined direction. In addition, the first ventilation channel and the second ventilation channel are connected to each other by connecting the bottom of the first ventilation channel with a bifurcation provided at the end of the second ventilation channel. That is, in the resin molded part, a ventilation channel is defined that connects the interior space with the exterior. For example, when the interior space is sealed, pressure is applied to the interior space of the resin molded part, but since the ventilation channel is defined in the resin molded part having this structure, the temperature difference and pressure difference between the interior space and the exterior are reduced. In addition, the resin molded part having this structure is constructed so that the portion where the first ventilation channel and the second ventilation channel communicate with each other is the narrowest in the ventilation channel. That is, by narrowing the connection portion between the first ventilation channel and the second ventilation channel while ensuring the ventilation volume in the ventilation channel, the resin molded part having this structure prevents insects from invading the interior space of the resin molded part through the ventilation channel. Therefore, the resin molded article having this structure can prevent the invasion of insects without increasing the number of parts.

[0148] According to the resin molded article having the configuration of [2] above, since each branch portion of the second ventilation duct is configured to be narrower than the first ventilation duct, the ventilation duct can be miniaturized compared to a case where the above configuration is not employed.

[0149] According to the resin molded article having the structure described in [3] above, since the filter that blocks liquid and allows gas to pass is provided to cover the opening on the interior side of the first ventilation channel, it is possible to prevent liquid from penetrating into the interior space through the ventilation channel. As a result, the resin molded article having this structure has excellent waterproof properties compared to a case where no filter is provided.

[0150] According to the method for manufacturing a resin molded part having the configuration of the above-mentioned [4], a resin molded part that exhibits at least the effect of the above-mentioned [1] can be manufactured only by using the first mold, the second mold, and the third mold. Therefore, the method for manufacturing a resin molded part having this configuration can easily manufacture a resin molded part that can prevent insect invasion without increasing the number of parts.

[0151] According to the hydraulic control device having the configuration of [5], similar to the resin molded part having the configuration of [1], insects are prevented from invading the interior space of the resin molded part through the ventilation passage by narrowing the communication portion between the first ventilation passage and the second ventilation passage while ensuring the ventilation volume within the ventilation passage. Therefore, the hydraulic control device having this configuration can prevent insects from invading without increasing the number of components.

[0152] In this manner, according to the present disclosure, it is possible to provide a resin molded article, a method of manufacturing the resin molded article, and a hydraulic control device that can prevent insect invasion without increasing the number of components.

Claims

1. A resin molded part having an internal space, the resin molded part comprising: a ventilation passage defined so as to communicate the interior space with the exterior of the resin molded part, Wherein, the ventilation channel includes: a first ventilation passage extending from the interior space in a predetermined direction to include a bottom; and a second ventilation passage extending from the exterior in a direction intersecting the predetermined direction, The first ventilation channel and the second ventilation channel are connected to each other by connecting the bottom portion with a bifurcation provided at the end of the second ventilation channel. The portion where the first ventilation channel and the second ventilation channel communicate with each other is the narrowest portion of the ventilation channel, and Wherein, each of the bifurcated portions is narrower than the first ventilation channel.

2. The resin molded article according to claim 1, further comprising: a filter configured to prevent liquid from passing through the filter and to allow gas to pass through the filter, The filter is configured to cover an opening of the first ventilation passage on the inner space side.

3. A method for manufacturing a resin molded article according to claim 1 or 2, the method comprising: using a first mold, a second mold, and a third mold, wherein the second mold is separated from and adjacent to the first mold, and at least a portion of the third mold is located between the first mold and the second mold. in, The first mold includes a protrusion protruding toward the second mold, and wherein the third mold includes a bifurcation portion at least at an end portion between the first mold and the second mold; The manufacturing method comprises: bringing the protrusion into contact with the two forked portions to hold the third mold between the first mold and the second mold; injecting resin into a space defined by the first mold, the second mold, and the third mold; pulling the third mold from between the first mold and the second mold to define the second ventilation channel; and The first mold is removed from the second mold to define the first ventilation channel.

4. A hydraulic control device comprising: a metal housing having an oil passage formed therein; as well as a resin molded part arranged on one surface of the metal housing, wherein the resin molded member accommodates a substrate in a substrate accommodating portion provided inside the resin molded member, the substrate being configured to control the hydraulic pressure in the oil channel, wherein, in the resin molded part, an electric control component is arranged in a device accommodation portion formed between the metal housing and the substrate accommodation portion, the electric control component being configured to control the hydraulic pressure in the oil passage, wherein a ventilation passage is defined in the resin molded part so as to communicate the substrate receiving portion with the outside of the resin molded part, wherein the resin molded part includes a filter configured to prevent liquid from passing through the filter and to allow gas to pass through the filter, Wherein, the ventilation channel includes: a first ventilation passage extending from the substrate receiving portion in a predetermined direction to include a bottom; and a second ventilation passage extending from the exterior in a direction intersecting the predetermined direction, The first ventilation channel and the second ventilation channel are connected to each other by connecting the bottom portion with a bifurcation provided at the end of the second ventilation channel. The portion where the first ventilation channel and the second ventilation channel communicate with each other is the narrowest portion of the ventilation channel. Each of the bifurcated portions is narrower than the first ventilation channel, and The filter is configured to cover an opening of the first ventilation passage on a side of the substrate receiving portion.

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