Automotive electrical unit

Abstract

To provide an automotive electrical unit 1 capable of preventing water from entering a circuit board 20 in a case part 11 by devising a housing 10.SOLUTION: A housing 10 includes: a case part 11; a cover part 12; and a hinge part 13 connecting the case part 11 and the cover part 12. A heat sink 30 dissipates heat generated from the circuit board 20 to the outside of the case part 11 through an opening 10a. The hinge part 13 is configured to be deformed so that the cover part 12 rotates relative to the case part 11 to switch from either of the case covered state and the case exposed state to the other.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an in-vehicle electrical unit.

Background Art

[0002] Conventionally, there has been proposed an electrical unit including a case portion and a connector terminal that penetrates between the inside and the outside of the case portion (for example, Patent Document 1).

[0003] In the electrical unit, a partition wall is provided to surround the periphery of the penetrating portion of the case portion through which the connector terminal penetrates so as to separate it from the internal space of the case portion, and a sealing member is filled in the surrounding portion by the partition wall.

[0004] Thereby, the sealing member prevents water from entering the internal space from the outside of the case portion through the penetrating portion of the case portion. Therefore, it is possible to prevent water from entering the electrical components in the internal space from the outside of the case portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the electrical unit of Patent Document 1 described above, by filling the sealing member in the surrounding portion by the partition wall, it is possible to prevent water from entering the electrical components in the internal space from the outside of the case portion through the penetrating portion of the case portion.

[0007] However, by using a sealing member for waterproofing as described above, the number of parts of the electrical unit increases. In addition, this causes an increase in manufacturing processes such as an assembly process for filling the sealing member and an inspection process for inspecting the filling state of the sealing member.

[0008] In view of the above points, an object of the present disclosure is to provide an in-vehicle electrical unit in which the housing is devised to prevent water from entering the electrical components in the internal space of the case portion from the outside of the case portion.

Means for Solving the Problems

[0009] According to one aspect of the present disclosure, an in-vehicle electrical unit includes a case portion (11) that forms an internal space (10b) and an opening (10a) that opens to one side in the first direction from the internal space, when a direction intersecting the vertical direction (Ya) is defined as the first direction (Yb); a cover portion (12); and a hinge portion (13) that connects the case portion and the cover portion, a housing (10); electrical components (20) housed in the internal space; a heat sink (30) that is disposed on one side in the first direction with respect to the electrical components and releases heat generated from the electrical components to the outside of the case portion through the opening, and when the state where the cover portion covers the case portion from above is defined as the first state and the state where the cover portion is detached from the case portion is defined as the second state, the hinge portion is configured to be able to switch between one of the first state and the second state and the other by rotating the cover portion with respect to the case portion due to its deformation.

[0010] Therefore, when the cover portion is in the first state, it is possible to prevent water from entering the internal space of the case portion from the outside of the case portion. Thereby, it is possible to provide an in-vehicle electrical unit in which the housing is devised to prevent water from entering the electrical components in the internal space of the case portion from the outside of the case portion.

[0011] Note that the reference numerals in parentheses attached to each component etc. indicate an example of the correspondence relationship between the component etc. and the specific components etc. described in the embodiments described later.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Embodiments for Carrying Out the Invention

[0013] Hereinafter, an embodiment of the in-vehicle electrical component unit 1 of the present disclosure will be described with reference to FIGS. 1 to 8 and the like. FIG. 1 is a front view of the in-vehicle electrical component unit 1, and FIG. 2 is a perspective view showing the back of the in-vehicle electrical component unit 1. FIG. 3 is an enlarged view of part III in FIG. 2.

[0014] FIG. 4 is a perspective view showing a state before the circuit board 20, the heat sink 30, etc. are housed in the case portion 11 of the in-vehicle electrical component unit 1 in FIG. 1. FIG. 5 is a perspective view showing a state before the circuit board 20, the heat sink 30, and the heat dissipation sheet 40 are assembled to the case portion of the in-vehicle electrical component unit 1.

[0015] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1, showing a state where the cover portion 12 covers the upper part of the case portion 11 from above. FIG. 7 is a cross-sectional view corresponding to FIG. 6, showing a state where the cover portion 12 is detached from the upper part of the case portion 11 and the upper part of the case portion 11 is exposed upward. FIG. 8 is an enlarged view of part VIII in FIG. 6.

[0016] Hereinafter, a direction intersecting (for example, orthogonal) the vertical direction Ya will be defined as the depth direction Yb (that is, the first direction). A direction intersecting (for example, orthogonal) the vertical direction Ya and intersecting (for example, orthogonal) the depth direction Yb will be defined as the width direction Yc (that is, the second direction). In the present embodiment, the vertical direction Ya, the depth direction Yb, and the width direction Yc are the directions in a state where the in-vehicle electrical component unit 1 is mounted on an automobile.

[0017] The in-vehicle electrical component unit 1 of the present embodiment is mounted in the engine room or the motor room of an automobile. The engine room is an area in the automobile where a running engine or the like is housed. The motor room or the like is an area in the automobile where a running electric motor is housed.

[0018] The in-vehicle electrical component unit 1 has waterproof performance that suppresses water from entering the circuit board 20 in the internal space 10b from the outside of the case portion 11. As shown in FIGS. 1 to 8 and the like, the in-vehicle electrical component unit 1 includes a housing 10, a circuit board 20, a heat sink 30, and a heat dissipation sheet 40. The housing 10 includes a case portion 11, a cover portion 12, and a hinge portion 13.

[0019] As shown in FIG. 4, the case portion 11 has an internal space 10b and an opening 10a that opens to one side in the depth direction Yb from the internal space 10b. The internal space 10b is a space for housing the circuit board 20, the heat sink 30, and the heat dissipation sheet 40.

[0020] Specifically, as shown in FIGS. 1 to 7 and the like, the case portion 11 includes a case rear portion 100, a case upper portion 101, case side portions 102 and 103, and a case bottom portion 104.

[0021] As shown in FIG. 2, the case rear portion 100 is formed in a plate shape that extends in the vertical direction Ya and the width direction Yc. Connector housings 100a, 100b, and 100c are provided on the case rear portion 100.

[0022] As shown in FIGS. 4, 6, and 7, the case upper portion 101 is formed in a long plate shape that extends in the width direction Yc and the depth direction Yb. The case upper portion 101 is disposed above the case rear portion 100. Upper surfaces 101a, 101b, etc. are provided on the case upper portion 101.

[0023] As shown in FIGS. 1, 2, and 4, the case side portion 102 is a first case side portion formed in a long plate shape that extends in the vertical direction Ya and the depth direction Yb. The case side portion 102 is disposed on one side in the width direction Yc with respect to the case rear portion 100.

[0024] As shown in FIGS. 1, 2, and 4, the case side portion 103 is a second case side portion formed in a long plate shape extending in the vertical direction Ya and the depth direction Yb. The case side portion 103 is disposed on the other side in the width direction Yc with respect to the case rear portion 100.

[0025] As shown in FIGS. 4, 6, and 7, the case bottom portion 104 is formed in a plate shape extending in the width direction Yc and the depth direction Yb. The case bottom portion 104 is disposed below the case rear portion 100.

[0026] As shown in FIG. 8, the case bottom portion 104 is formed so as to go downward as it proceeds from the other side in the depth direction Yb to one side in the depth direction Yb. A drain port 107 for discharging the water in the internal space 10b to the outside of the case portion 11 through the opening 10a is provided between the case bottom portion 104 and the heat sink 30.

[0027] Thereby, the water on the case bottom portion 104 can be guided to one side in the depth direction Yb by gravity and discharged from the opening 10a. The case rear portion 100 is connected to each of the case upper portion 101, the case side portions 102, 103, and the case bottom portion 104. The case upper portion 101 is connected to each of the case side portions 102, 103.

[0028] The case bottom portion 104 is connected to each of the case side portions 102, 103. The case upper portion 101, the case side portions 102, 103, and the case bottom portion 104 constitute the opening 10a. FIG. 9 is a partially enlarged view showing a state in which the heat sink is removed at the lower part of the in - vehicle electrical component unit 1.

[0029] As shown in FIGS. 4, 8, and 9, the case portion 11 is provided with waterproof portions 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105h. Hereinafter, the waterproof portions 105a, 105b, 105c, 105d, 105e, 105f, 105g, 105h will be collectively referred to as waterproof portions 105a - 105h.

[0030] As shown in FIG. 9, the waterproof parts 105a to 105h are respectively arranged on the lower side with respect to the circuit board 20. As shown in FIG. 8, the waterproof parts 105a to 105h are respectively arranged on the other side in the depth direction Yb with respect to the heat sink 30. The waterproof parts 105a to 105h are arranged on the upper side with respect to the case bottom 104. The waterproof parts 105a to 105h are respectively arranged side by side in the width direction Yc.

[0031] As shown in FIG. 9, a drain port 106, which is an interval, is provided between two adjacent waterproof parts among the waterproof parts 105a to 105h. The waterproof parts 105a and 105b are arranged adjacent to each other in the width direction Yc. The waterproof parts 105b and 105c are arranged adjacent to each other in the width direction Yc.

[0032] The waterproof parts 105c and 105d are arranged adjacent to each other in the width direction Yc. The waterproof parts 105d and 105e are arranged adjacent to each other in the width direction Yc. The waterproof parts 105e and 105f are arranged adjacent to each other in the width direction Yc. The waterproof parts 105f and 105g are arranged adjacent to each other in the width direction Yc. The waterproof parts 105g and 105h are arranged adjacent to each other in the width direction Yc.

[0033] One side region 108b in the width direction Yc of the waterproof part 105b is arranged on the upper side with respect to the other side region 109a in the width direction Yc of the waterproof part 105a. One side region 108b of the waterproof part 105b is arranged so as to overlap in the vertical direction Ya with the other side region 109a in the width direction Yc of the waterproof part 105a.

[0034] Here, one side region 108b in the width direction Yc of the waterproof part 105b is a region on one side with respect to the central part in the width direction Yc of the waterproof part 105b. Similarly, one side regions 108c to 108h of the waterproof parts 105c to 105h are respectively regions on one side with respect to the central part in the width direction Yc of the waterproof parts.

[0035] The other region 109a in the width direction Yc of the waterproof portion 105a is the region on the other side with respect to the central portion in the width direction Yc of the waterproof portion 105a. Similarly, the other regions 109b to 109g of the waterproof portions 105b to 105g are the regions on the other side with respect to the central portion in the width direction Yc of each waterproof portion.

[0036] Furthermore, one region 108c in the width direction Yc of the waterproof portion 105c is disposed above the other region 109b in the width direction Yc of the waterproof portion 105b. One region 108c in the width direction Yc of the waterproof portion 105c is disposed so as to overlap with the other region 109b in the width direction Yc of the waterproof portion 105b in the vertical direction Ya.

[0037] One region 108d in the width direction Yc of the waterproof portion 105d is disposed above the other region 109c in the width direction Yc of the waterproof portion 105c. One region 108d in the width direction Yc of the waterproof portion 105d is disposed so as to overlap with the other region 109c in the width direction Yc of the waterproof portion 105c in the vertical direction Ya.

[0038] One region 108e in the width direction Yc of the waterproof portion 105e is disposed above the other region 109d in the width direction Yc of the waterproof portion 105d. One region 108e in the width direction Yc of the waterproof portion 105e is disposed so as to overlap with the other region 109d in the width direction Yc of the waterproof portion 105d in the vertical direction Ya.

[0039] One region 108f in the width direction Yc of the waterproof portion 105f is disposed above the other region 109e in the width direction Yc of the waterproof portion 105e. One region 108f in the width direction Yc of the waterproof portion 105f is disposed so as to overlap with the other region 109e in the width direction Yc of the waterproof portion 105e in the vertical direction Ya.

[0040] One side region 108g in the width direction Yc of the waterproof part 105g is disposed above the other side region 109f in the width direction Yc of the waterproof part 105f. One side region 108g in the width direction Yc of the waterproof part 105g is disposed so as to overlap the other side region 109f in the width direction Yc of the waterproof part 105f in the vertical direction Ya.

[0041] One side region 108h in the width direction Yc of the waterproof part 105h is disposed above the other side region 109g in the width direction Yc of the waterproof part 105g. One side region 108h in the width direction Yc of the waterproof part 105h is disposed so as to overlap the other side region 109g in the width direction Yc of the waterproof part 105g in the vertical direction Ya.

[0042] Hereinafter, the waterproof parts 105b, 105c, 105d, 105e, 105f, 105g are collectively referred to as the waterproof parts 105b to 105g.

[0043] The waterproof parts 105b to 105g each include inclined surfaces 110a and 110b. The inclined surfaces 110a and 110b are provided above each of the waterproof parts 105b to 105g. The inclined surface 110a is disposed on one side in the width direction Yc with respect to the inclined surface 110b in each of the waterproof parts 105b to 105g.

[0044] The inclined surface 110a is formed so as to face downward from the other side in the width direction Yc toward one side in the width direction Yc. The inclined surface 110b is formed so as to face downward from one side in the width direction Yc toward the other side in the width direction Yc.

[0045] The waterproof parts 105a to 105h of the present embodiment are each connected to the case rear portion 100. As a result, the waterproof parts 105a to 105h are each formed so as to protrude from the case rear portion 100 toward one side in the depth direction Yb.

[0046] The cover part 12 shown in FIGS. 1 to 3 is arranged on the upper side of the case part 11. As shown in FIGS. 2 to 4, the cover part 12 is connected to the upper end part 100d of the case rear part 100 of the case part 11 via a hinge part 13. The hinge part 13 connects the upper end part 100d of the case rear part 100 of the case part 11 and the cover upper part 120 of the cover part 12.

[0047] The hinge part 13 is formed across the width direction Yc. The hinge part 13 has a smaller wall thickness (i.e., thickness dimension) compared to the case part 11 and the cover part 12. The hinge part 13 is configured such that the cover part 12 can be rotated 180° around the axis S in FIG. 4 with respect to the case part 11 by its deformation. The axis S is an imaginary line extending in the width direction Yc at the hinge part 13.

[0048] As shown in FIGS. 1 to 10, the cover part 12 is displaced from the upper case part 101 of the case part 11 by its rotation, and from the state where the upper case part 101 of the case part 11 is exposed upward to the state where the upper case part 101 of the case part 11 is covered from above.

[0049] Hereinafter, for convenience of explanation, as shown in FIGS. 4 and 7, the state where the cover part 12 is detached from the upper case part 101 of the case part 11 and the upper case part 101 of the case part 11 is exposed upward is referred to as the case exposed state (i.e., the second state). As shown in FIGS. 1, 2, and 6, the state where the cover part 12 covers the upper case part 101 of the case part 11 from above is referred to as the case covered state (i.e., the first state).

[0050] As shown in FIGS. 1 to 7, the cover part 12 includes a cover upper part 120, cover side parts 121, 122, and a cover guide part 123. Hereinafter, the structure of the cover part 12 will be described separately for the case covered state in FIGS. 1, 2, and 10 and the case exposed state in FIGS. 4 and 7.

[0051] (Case exposed state) First, the structure of the cover part 12 when the cover part 12 is in the case-exposed state will be described with reference to FIGS. 4 and 7.

[0052] The upper cover part 120 is disposed above the upper case part 101 of the case part 11 and on the other side in the depth direction Yb. The upper cover part 120 is formed in a long plate shape that extends in the depth direction Yb and the width direction Yc.

[0053] The side cover parts 121 and 122 are each formed in a rectangular plate shape that extends in the vertical direction Ya and the depth direction Yb. The side cover parts 121 and 122 are each disposed above the upper case part 101 of the case part 11 and on the other side in the depth direction Yb.

[0054] The side cover part 121 is the first side cover part disposed on one side in the width direction Yc with respect to the upper cover part 120. The side cover part 122 is the second side cover part disposed on the other side in the width direction Yc with respect to the upper cover part 120. The side cover parts 121 and 122 are each provided with hole parts 121a and 122a used for holding the cover part 12, as will be described later.

[0055] The cover guide part 123 is disposed on the other side in the depth direction Yb and above the upper case part 101 of the case part 11. The cover guide part 123 is disposed above the upper region 30a of the heat sink 30. The cover guide part 123 includes a long plate part 123a, a plurality of cover separation parts 124, and a plurality of cover grooves 125.

[0056] The long plate part 123a is formed in a plate shape that extends in the vertical direction Ya and the width direction Yc. The plurality of cover separation parts 124 are disposed above the long plate part 123a. The plurality of cover separation parts 124 are each connected to the long plate part 123a.

[0057] The plurality of cover separation portions 124 are arranged at intervals in the width direction Yc. Between two adjacent cover separation portions 124 among the plurality of cover separation portions 124, a cover groove 125 is formed. Each of the plurality of cover grooves 125 is formed in a concave shape that is recessed on one side in the depth direction Yb.

[0058] On one side in the depth direction Yb of each of the plurality of cover grooves 125, bottom portions 125a, 125b are provided. The bottom portion 125a is formed parallel to the vertical direction Ya and parallel to the width direction Yc.

[0059] The bottom portion 125b is disposed below the bottom portion 125a and above the long plate portion 123a. The bottom portion 125b is connected to the bottom portion 125a and connected to the long plate portion 123a. The bottom portion 125b is formed so as to advance to the other side in the depth direction Yb from the upper side to the lower side.

[0060] In each of the plurality of cover separation portions 124, a recessed portion 124a that is recessed on one side in the depth direction Yb over the vertical direction Ya is provided. As a result, the cover guide portion 123 is provided with a plurality of recessed portions 124a.

[0061] (Case cover state) Next, the structure of the cover portion 12 when the cover portion 12 is in the case cover state will be described with reference to FIGS. 1, 2, and 6. The cover upper portion 120 is disposed above the case upper portion 101 of the case portion 11. The cover upper portion 120 is formed in a long plate shape that extends in the depth direction Yb and the width direction Yc.

[0062] The cover side portions 121, 122 are each formed in a rectangular plate shape that extends in the vertical direction Ya and the depth direction Yb, similar to the case of the above-described case exposure state. The cover side portions 121, 122 are each disposed above the case portion 11.

[0063] The cover side portion 121 is disposed on one side in the width direction Yc with respect to the case side portion 102 and the cover upper portion 120. The cover side portion 121 is supported by the support ribs 102a and 102b of the case portion 11.

[0064] Note that between the cover side portion 121 and the case side portion 102, as will be described later, a water intrusion prevention structure is configured to prevent water from entering the internal space 10b from the outside of the case portion 11.

[0065] The support rib 102a is supported by the case side portion 102. The support rib 102a is disposed below the cover side portion 121. The support rib 102a protrudes from the case side portion 102 to one side in the width direction Yc. The support rib 102a is formed across the depth direction Yb. The support rib 102a supports the cover side portion 121 from below.

[0066] The support rib 102b is supported by the case rear portion 100. The support rib 102b is disposed on the other side in the depth direction Yb with respect to the cover side portion 121. The support rib 102b is formed across the vertical direction Ya. The support rib 102b supports the cover side portion 121 from the other side in the depth direction Yb.

[0067] The protrusion 12a of the case side portion 102 is fitted into the hole portion 121a of the cover side portion 121. Thus, the cover portion 12 is held with respect to the case portion 11 in a state of being supported by the support ribs 102a and 102b of the case portion 11.

[0068] Also, the cover side portion 122 is disposed on the other side in the width direction Yc with respect to the case side portion 103 and the cover upper portion 120. Note that between the cover side portion 122 and the case side portion 103, as will be described later, a water intrusion prevention structure is configured to prevent water from entering the internal space 10b from the outside of the case portion 11.

[0069] The cover side part 122 is supported by the support ribs 103a and 103b of the case part 11. The support rib 103a is supported by the case side part 103. The support rib 103a is disposed below the cover side part 122.

[0070] The support rib 103a is formed across the depth direction Yb. The support rib 103b protrudes from the case side part 103 to the other side in the width direction Yc. The support rib 103a supports the cover side part 122 from below.

[0071] The support rib 103b is supported by the case rear part 100. The support rib 103b is disposed on the other side in the depth direction Yb with respect to the cover side part 122. The support rib 102b is formed across the vertical direction Ya.

[0072] The protrusion 12b of the cover part 12 is fitted into the hole 122a of the cover side part 122. As a result, the cover part 12 is held with respect to the case part 11 while being supported by the support ribs 103a and 103b of the case part 11. The support rib 103b supports the cover side part 122 from the other side in the depth direction Yb.

[0073] The cover guide part 123 is disposed above the case part 11 and on one side in the depth direction Yb with respect to the case part 11. The cover guide part 123 is disposed on one side in the depth direction Yb with respect to the upper region 30a of the heat sink 30.

[0074] Thereby, the cover guide part 123 covers the upper region 30a of the heat sink 30 from one side in the depth direction Yb. The long plate part 123a is disposed above the cover guide part 123. The long plate part 123a is formed in a plate shape that extends in the vertical direction Ya and the depth direction Yb.

[0075] The plurality of cover separation parts 124 are each disposed below the long plate part 123a. The plurality of cover separation parts 124 are arranged at intervals in the width direction Yc. Further, the plurality of cover grooves 125 are each formed in a concave shape that is recessed on the other side in the depth direction Yb.

[0076] The bottom part 125a is formed parallel to the vertical direction Ya and parallel to the width direction Yc. The bottom part 125b is disposed above the bottom part 125a and below the long plate part 123a.

[0077] The bottom part 125b is formed so as to advance toward one side in the depth direction Yb from the lower side to the upper side. Each of the plurality of cover grooves 125 communicates with a corresponding one of the plurality of heat dissipation grooves 300 of the heat sink 30.

[0078] The plurality of concave parts 124a are each formed so as to be recessed toward one side in the depth direction Yb over the vertical direction Ya in each of the plurality of cover separation parts 124. Further, the upper regions 32b of the corresponding heat dissipation fins 32 among the plurality of heat dissipation fins 32 of the heat sink 30 are fitted into the plurality of concave parts 124a.

[0079] In the present embodiment, the housing 10 is made of a resin material. Further, the case part 11, the cover part 12, and the hinge part 13 constitute an integrated structure that is integrated.

[0080] Further, as shown in FIGS. 1 and 7, the heat sink 30 is housed in the internal space 10b. The heat sink 30 is disposed on one side in the depth direction Yb with respect to the circuit board 20.

[0081] The heat sink 30 includes a heat dissipation base 31, a plurality of heat dissipation fins 32, and heat dissipation legs 33, 34. The upper end portion of the heat sink 30 is disposed below the upper end portion of the circuit board 20. The heat dissipation base 31 is formed so as to cover the circuit board 20 from one side in the depth direction Yb.

[0082] The heat-radiating base 31 is formed in a plate shape that extends in the vertical direction Ya and the width direction Yc along the surface of the circuit board 20. The surface of the circuit board 20 is the surface formed on one side of the circuit board 20 in the depth direction Yb.

[0083] The plurality of heat-radiating fins 32 are arranged at intervals in the width direction Yc. Each of the plurality of heat-radiating fins 32 is formed so as to protrude from the heat-radiating base 31 to one side in the depth direction Yb. Each of the plurality of heat-radiating fins 32 is formed to extend in the vertical direction Ya.

[0084] In the present embodiment, the tip 32a of each of the plurality of heat-radiating fins 32 is located on one side in the depth direction Yb with respect to the opening 10a. Thereby, the heat-radiating performance of the heat sink 30 can be ensured.

[0085] As shown in FIG. 5, the heat-radiating leg 33 is a first heat-radiating leg disposed on one side in the width direction Yc with respect to the heat-radiating base 31. The heat-radiating leg 33 is connected to one side end 31a of the heat-radiating base 31 in the width direction Yc. The heat-radiating leg 33 is formed so as to cover the circuit board 20 from one side in the width direction Yc.

[0086] The heat-radiating leg 33 supports one side end 31a of the heat-radiating base 31 in the width direction Yc. The heat-radiating leg 33 is disposed on one side in the depth direction Yb with respect to the rear case 100. Thereby, the heat-radiating leg 33 is supported from the other side in the depth direction Yb by the rear case 100.

[0087] The heat-radiating leg 33 is disposed on the other side in the width direction Yc with respect to the case side portion 102. Thereby, the heat-radiating leg 33 is supported from one side in the width direction Yc by the case side portion 102. As will be described later, the heat-radiating leg 33 is formed to prevent water from entering the internal space 10b through between the heat-radiating leg 33 and the case side portion 102.

[0088] As shown in FIG. 5, the heat radiating leg portion 34 is a second heat radiating leg portion disposed on the other side in the width direction Yc with respect to the heat radiating base portion 31. The heat radiating leg portion 34 is connected to the other end portion 31b in the width direction Yc of the heat radiating base portion 31. The heat radiating leg portion 34 is formed so as to cover the circuit board 20 from the other side in the width direction Yc.

[0089] The heat radiating leg portion 34 supports the other end portion 31b in the width direction Yc of the heat radiating base portion 31. The heat radiating leg portion 34 is disposed on one side in the depth direction Yb with respect to the rear case portion 100. Thereby, the heat radiating leg portion 34 is supported from the other side in the depth direction Yb by the rear case portion 100.

[0090] The heat radiating leg portion 34 is disposed on one side in the width direction Yc with respect to the case side portion 103. Thereby, the heat radiating leg portion 34 is supported from the other side in the width direction Yc by the case side portion 103. As will be described later, the heat radiating leg portion 34 is formed so as to prevent water from entering the internal space 10b through between the heat radiating leg portion 34 and the case side portion 103.

[0091] As shown in FIG. 10, the heat sink 30 is provided with a heat radiating rib 35a that supports the circuit board 20 from one side in the width direction Yc. The heat radiating rib 35a is formed so as to protrude from the heat radiating base portion 31 toward the other side in the depth direction Yb.

[0092] As shown in FIG. 10, the heat sink 30 is provided with a heat radiating rib 35b that supports the circuit board 20 from the other side in the width direction Yc. The heat radiating rib 35b is formed so as to protrude from the heat radiating base portion 31 toward the other side in the depth direction Yb.

[0093] The heat sink 30 of the present embodiment constitutes an integrated structure integrated by aluminum or the like. The heat sink 30 is manufactured by extrusion molding, which is a manufacturing method less expensive than die casting. The heat sink 30 is fixed to the case portion 11 by engagement with the claw portion 351 or fastening with screws.

[0094] The circuit board 20 is an electrical component formed in a plate shape that extends in the vertical direction Ya and the width direction Yc. The circuit board 20 is disposed within the internal space 10b. The circuit board 20 is disposed on the other side of the heat sink 30 in the depth direction Yb.

[0095] The circuit board 20 of the present embodiment is configured by mounting a plurality of electronic components such as semiconductor elements and integrated circuits on an insulating board having a circuit pattern. As shown in FIG. 5, connectors 21a, 21b, and 21c are provided on the other side of the circuit board 20 in the depth direction Yb.

[0096] The connector 21a is housed in the connector housing 100a. The connector 21b is housed in the connector housing 100b. The connector 21c is housed in the connector housing 100c.

[0097] The circuit board 20 is supported by the heat sink 30 with a space left between it and the rear part 100 of the case. The circuit board 20 is supported and fixed to the heat sink 30 by screws 350, heat dissipation ribs 35a, and 35b.

[0098] Next, the specific inclined shape of the case upper part 101 of the case part 11 of the present embodiment will be described with reference to FIGS. 4, 11, and 12.

[0099] FIG. 11 is a perspective view showing the front of the in - vehicle electrical component unit 1 with the cover part 12 seen through in the present embodiment. FIG. 12 is an enlarged perspective view of the upper side of the in - vehicle electrical component unit 1 in FIG. 11.

[0100] As shown in FIGS. 4, 11, and 12, the case upper part 101 of the case part 11 is provided with upper surfaces 101a, 101b, inclined end surfaces 101c, 101d, and waterproof ribs 101e, 101f. The upper surfaces 101a, 101b, inclined end surfaces 101c, and inclined end surfaces 101d are respectively provided on the upper side of the case upper part 101.

[0101] The upper surface 101a is provided from the central side in the width direction Yc to one side in the width direction Yc. The upper surface 101a is formed in an inclined shape that slopes downward from the central side in the width direction Yc toward one side in the width direction Yc. Thereby, the upper surface 101a can guide water so that the water flows to one side in the width direction Yc and can prevent the water from flowing toward the opening 10a side (i.e., the circuit board 20 side).

[0102] The upper surface 101b is provided from the central side in the width direction Yc to the other side in the width direction Yc. The upper surface 101b is formed in an inclined shape that slopes downward from the central side in the width direction Yc toward the other side in the width direction Yc. Thereby, the upper surface 101b can guide water so that the water flows to one side in the width direction Yc and can prevent the water from flowing toward the opening 10a side (i.e., the circuit board 20 side).

[0103] The inclined end face 101c is disposed on one side in the width direction Yc with respect to the upper surface 101a. The inclined end face 101c is formed in an inclined shape that slopes downward from one end in the width direction Yc of the upper surface 101a toward one side in the width direction Yc.

[0104] The inclination angle of the inclined end face 101c is larger than the inclination angle of the upper surface 101a. Thereby, the inclined end face 101c can reliably guide the water flowing on the upper surface 101a to one side in the width direction Yc by gravity.

[0105] The inclined end face 101d is disposed on the other side in the width direction Yc with respect to the upper surface 101b. The inclined end face 101d is formed in an inclined shape that slopes downward from the other end in the width direction Yc of the upper surface 101b toward the other side in the width direction Yc.

[0106] The inclination angle of the inclined end face 101d is larger than the inclination angle of the upper surface 101b. Thereby, the inclined end face 101d can reliably guide the water flowing on the upper surface 101b downward by gravity.

[0107] The waterproof rib 101e is formed across the width direction Yc at the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d. The waterproof rib 101e is formed so as to protrude upward from the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d.

[0108] The waterproof rib 101f is formed across the width direction Yc at the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d. The waterproof rib 101f is formed so as to protrude upward from the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d.

[0109] The waterproof ribs 101e and 101f are respectively arranged on one side in the depth direction Yb at the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d. The waterproof rib 101f is arranged on one side in the depth direction Yb with respect to the waterproof rib 101e.

[0110] The waterproof ribs 101e and 101f respectively play a role in preventing the water flowing on the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d from flowing to one side in the depth direction Yb. The waterproof ribs 101e and 101f can prevent the water flowing on the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d from reaching the circuit board 20.

[0111] Among the upper end portions 100d of the case rear portion 100 of the present embodiment, the upper end portion 100d is formed so as to protrude upward across the width direction Yc with respect to the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d.

[0112] Next, the specific shapes of the case side portions 102 and 103 of the case portion 11 of the present embodiment will be described with reference to FIGS. 13, 14, and 15.

[0113] FIG. 13 is a cross-sectional view taken along XIII-XIII in FIG. 1, FIG. 14 is an enlarged view of a portion XIV in FIG. 13, and FIG. 15 is an enlarged view of a portion XV in FIG. 13.

[0114] As shown in FIGS. 13 and 14, the case side portion 102 is disposed on one side in the width direction Yc with respect to the case rear portion 100. The case side portion 102 is disposed on the other side in the width direction Yc with respect to the cover side portion 121.

[0115] Specifically, as shown in FIG. 14, the case side portion 102 is supported by the case rear portion 100 via the case connection portion 200a. The case connection portion 200a includes a case extension portion 201a and a case protrusion portion 202a.

[0116] The case extension portion 201a is formed to extend from one end in the width direction Yc of the case rear portion 100 to one side in the depth direction Yb. The case protrusion portion 202a is formed to protrude from one end in the depth direction Yb of the case extension portion 201a to one side in the width direction Yc.

[0117] One end in the width direction Yc of the case protrusion portion 202a is connected to the case side portion 102. The case side portion 102 is formed to extend in the depth direction Yb along the cover side portion 121.

[0118] Specifically, the case side portion 102 includes side wall portions 210a and 211a. The side wall portion 210a is formed to extend from one end in the width direction Yc of the case protrusion portion 202a to one side in the depth direction Yb.

[0119] The side wall portion 211a is formed to extend from one end in the width direction Yc of the case protrusion portion 202a to the other side in the depth direction Yb. As a result, an elongated gap 300a is formed between the case side portion 102 and the cover side portion 121 in the depth direction Yb.

[0120] A waterproof portion 212a is provided on the case side portion 102 of the case portion 11 of the present embodiment in order to prevent water from entering the internal space 10b through the gap 300a. The waterproof portion 212a is formed to protrude from the other end in the depth direction Yb of the side wall portion 211a to one side in the width direction Yc.

[0121] The waterproof portion 212a is formed across the vertical direction Ya. The waterproof portion 212a forms a gap 301a between the other end of the depth direction Yb of the case side portion 102. The gap 301a is connected to the gap 300a and is open to one side in the width direction Yc.

[0122] As a result, the gaps 301a and 300a constitute a gap 310a that is open to one side in the width direction Yc and is formed in an L shape in order to prevent water from entering the internal space 10b.

[0123] As shown in FIGS. 13 and 15, the case side portion 103 is disposed on the other side in the width direction Yc with respect to the case rear portion 100. The case side portion 103 is disposed on one side in the width direction Yc with respect to the cover side portion 122.

[0124] The case side portion 103 is supported by the case rear portion 100 via the case connection portion 200b. The case connection portion 200b includes a case extension portion 201b and a case protrusion portion 202b.

[0125] The case extension portion 201b is formed to extend from the other end in the width direction Yc of the case rear portion 100 to one side in the depth direction Yb. The case protrusion portion 202b is formed to protrude from the other end in the depth direction Yb of the case extension portion 201b to the other side in the width direction Yc.

[0126] The other end in the width direction Yc of the case protrusion portion 202b is connected to the case side portion 103. The case side portion 103 is formed to extend in the depth direction Yb along the cover side portion 122.

[0127] Specifically, the case side portion 103 includes side wall portions 210b and 211b. The side wall portion 210b is formed to extend from the other end in the width direction Yc of the case protrusion portion 202b to one side in the depth direction Yb.

[0128] The side wall portion 211b is formed to extend from the other end portion in the width direction Yc of the case protrusion portion 202b to the other side in the depth direction Yb. As a result, an elongated gap 300b is formed between the case side portion 103 and the cover side portion 122 in the depth direction Yb.

[0129] In the case side portion 103 of the case portion 11 of the present embodiment, a waterproof portion 212b is provided in order to suppress water from entering the internal space 10b through the gap 300b. The waterproof portion 212b is formed to protrude from the other end portion in the depth direction Yb of the side wall portion 211b to the other side in the width direction Yc.

[0130] The waterproof portion 212b is formed over the vertical direction Ya. The waterproof portion 212b forms a gap 301b between it and the other end portion in the depth direction Yb of the case side portion 102. The gap 301b is connected to the gap 300b and is open to the other side in the width direction Yc.

[0131] As a result, the gaps 301b and 300b are open to the other side in the width direction Yc and constitute a gap 310b formed in an L shape in order to suppress water from entering the internal space 10b.

[0132] Next, the specific shapes of the heat dissipation leg portions 33 and 34 of the heat sink 30 of the present embodiment will be described with reference to FIGS. 10, 16, and 17.

[0133] As shown in FIGS. 10 and 16, the heat dissipation leg portion 33 of the heat sink 30 is disposed on the other side in the width direction Yc with respect to the case side portion 102. A gap 320a is provided between the heat dissipation leg portion 33 and the case side portion 102 and is formed over the depth direction Yb.

[0134] Specifically, as shown in FIG. 16, the gap 320a includes a gap region 321a as a first gap region formed on one side in the depth direction Yb between the heat dissipation leg portion 33 and the case side portion 102.

[0135] The gap 320a is formed on the other side in the depth direction Yb with respect to the gap region 321a between the heat radiating leg portion 33 and the case side portion 102, and includes a gap region 322a as a second gap region that communicates with the gap region 321a.

[0136] Furthermore, the gap 320a is formed on the other side in the depth direction Yb with respect to the gap region 322a between the heat radiating leg portion 33 and the case side portion 102, and includes a gap region 323a as a third gap region that communicates with the gap region 322a.

[0137] Hereinafter, the region on one side in the depth direction Yb of the heat radiating leg portion 33 is defined as a heat radiating leg portion one - side region 33a, and the region on the other side in the depth direction Yb of the heat radiating leg portion 33 is defined as a heat radiating leg portion other - side region 33c. The region between the heat radiating leg portion one - side region 33a and the heat radiating leg portion other - side region 33c of the heat radiating leg portion 33 is defined as a heat radiating leg portion central region 33b.

[0138] The heat radiating leg portion one - side region 33a and the heat radiating leg portion other - side region 33c are each formed along the case side portion 102 over the depth direction Yb. The heat radiating leg portion central region 33b is formed in a curved shape that protrudes to the other side in the width direction Yc away from the case side portion 102.

[0139] In the present embodiment, the gap region 321a is formed between the heat radiating leg portion one - side region 33a and the case side portion 102. The gap region 322a is formed between the heat radiating leg portion central region 33b and the case side portion 102. The gap region 323a is formed between the heat radiating leg portion other - side region 33c and the case side portion 102.

[0140] In the present embodiment, the heat radiating leg portion 33 and the case side portion 102 are formed such that the distance in the width direction Yc of the gap region 322a is larger than those of the gap regions 321a and 323a.

[0141] This can prevent water from flowing through the gap 320a to the other side in the depth direction by capillary action. Therefore, it is possible to prevent water from entering the internal space 10b through the gap 320a.

[0142] As shown in FIGS. 10 and 17, the heat dissipation leg portion 34 of the heat sink 30 is disposed on one side in the width direction Yc with respect to the case side portion 103. A gap 320b is provided between the heat dissipation leg portion 34 and the case side portion 103 and extends in the depth direction Yb.

[0143] Specifically, as shown in FIG. 17, the gap 320b includes a gap region 321b as a fourth gap region formed on one side in the depth direction Yb between the heat dissipation leg portion 34 and the case side portion 103.

[0144] The gap 320b includes a gap region 322b as a fifth gap region formed on the other side in the depth direction Yb with respect to the gap region 321b between the heat dissipation leg portion 34 and the case side portion 103 and communicating with the gap region 321b.

[0145] Furthermore, the gap 320b includes a gap region 323b as a sixth gap region formed on the other side in the depth direction Yb with respect to the gap region 322b between the heat dissipation leg portion 34 and the case side portion 103 and communicating with the gap region 322b.

[0146] Hereinafter, the region on one side in the depth direction Yb of the heat dissipation leg portion 34 is defined as a heat dissipation leg portion one - side region 34a, and the region on the other side in the depth direction Yb of the heat dissipation leg portion 34 is defined as a heat dissipation leg portion other - side region 34c. The region between the heat dissipation leg portion one - side region 34a and the heat dissipation leg portion other - side region 34c of the heat dissipation leg portion 34 is defined as a heat dissipation leg portion central region 34b.

[0147] The heat dissipation leg portion one - side region 34a and the heat dissipation leg portion other - side region 34c are each formed to extend in the depth direction Yb along the case side portion 103. The heat dissipation leg portion central region 34b is formed in a curved shape that protrudes to one side in the width direction Yc away from the case side portion 103.

[0148] In this embodiment, the gap region 321b is formed between one side region 34a of the heat dissipation leg portion and the case side portion 103. The gap region 322b is formed between the central region 34b of the heat dissipation leg portion and the case side portion 103. The gap region 323a is formed between the other side region 33c of the heat dissipation leg portion and the case side portion 103.

[0149] In this embodiment, the heat dissipation leg portion 34 and the case side portion 103 are formed such that the distance in the width direction Yc of the gap region 322b is larger than that of the gap regions 321b and 323b.

[0150] This can suppress water from flowing to the other side in the depth direction by capillary action through the gap 320b. Therefore, it is possible to prevent water from entering the internal space 10b through the gap 320b.

[0151] Next, a manufacturing method of the in-vehicle electrical component unit 1 of this embodiment will be described with reference to FIGS. 4 and 5.

[0152] In the first step, the housing 10, the circuit board 20, the heat sink 30, and the heat dissipation sheet 40 shown in FIGS. 4 and 5 are prepared independently.

[0153] At this time, the hinge portion 13 is configured such that, due to its deformation, the cover portion 12 can be switched from one of the case cover state and the case exposed state to the other by rotating with respect to the case portion 11.

[0154] In the next second step, with the heat dissipation sheet 40 sandwiched between the circuit board 20 and the heat sink 30, the circuit board 20 is fixed to the heat sink 30 by screws 350, claw portions 351, etc. Thereby, the circuit board 20, the heat sink 30, and the heat dissipation sheet 40 can be integrated.

[0155] In the next third step, the integrated circuit board 20, heat sink 30, and heat dissipation sheet 40 are housed in the internal space 10b of the case portion 11. A plurality of heat dissipation fins 32 of the heat sink 30 are exposed from the opening 10a of the case portion 11 to one side in the width direction Yc.

[0156] In addition, the heat sink 30 is fixed to the case portion 11 by engagement with the claw portion 351 or fastening with screws. At this time, the circuit board 20 is fixed to the case portion 11 via the heat sink 30 while being sandwiched between the heat dissipation legs 33 and 34 of the heat sink 30. As a result, the circuit board 20 is covered by the heat sink 30 from one side in the depth direction Yb and one side and the other side in the width direction Yc.

[0157] In the next fourth step, the hinge portion 13 is deformed and the cover portion 12 is rotated with respect to the case portion 11, thereby switching from the case-exposed state to the case-covered state.

[0158] At this time, the upper cover 120 covers the circuit board 20 from above via the upper case 101 of the case portion 11.

[0159] Furthermore, the cover guide portion 123 is disposed on one side in the depth direction Yb of the case portion 11. Therefore, the cover guide portion 123 covers the upper region of the circuit board 20 and the upper region of the heat sink 30 from one side in the depth direction Yb.

[0160] In addition, the upper regions 32b of the corresponding heat dissipation fins 32 among the plurality of heat dissipation fins 32 are fitted into the plurality of recesses 124a of the cover portion 12. As a result, the cover portion 12 and the plurality of heat dissipation fins 32 are fixed.

[0161] Here, the protrusion 12a of the case side portion 102 is fitted into the hole 121a of the cover side portion 121. The protrusion 12b of the case side portion 103 is fitted into the hole 122a of the cover side portion 122.

[0162] As a result, the cover part 12 is held with respect to the case part 11 while being supported by the support ribs 102a and 102b of the case part 11. At this time, the cover part 12 may be fixed to the case part 11 with screws or the like.

[0163] As described above, the cover part 12 is fixed to the case part 11 in a state of covering the upper region of the circuit board 20 and the upper region of the heat sink 30. Thereby, the assembly of the in-vehicle electrical component unit 1 is completed.

[0164] Next, the operation of the in-vehicle electrical component unit 1 of the present embodiment will be described.

[0165] First, when a plurality of electronic components in the circuit board 20 operate and generate heat, the heat generated from the plurality of electronic components is transmitted to the circuit board 20. The transmitted heat is transmitted from the circuit board 20 to the heat dissipation base 31 of the heat sink 30.

[0166] This heat is transmitted from the heat dissipation base 31 of the heat sink 30 to the plurality of heat dissipation fins 32. The transmitted heat is dissipated to the outside of the case part 11 from the plurality of heat dissipation fins 32. As a result, the heat generated from the plurality of electronic components is discharged to one side in the depth direction Yb with respect to the opening 10a through the circuit board 20 and the plurality of heat dissipation fins 32 of the heat sink 30.

[0167] On the other hand, heat is also dissipated from the heat dissipation base 31 of the heat sink 30 into each of the plurality of heat dissipation grooves 300.

[0168] At this time, when an air flow upward is generated in the plurality of heat dissipation grooves 300 due to the convection accompanying this heat dissipation or the running wind of the automobile, this air flow flows from each of the plurality of heat dissipation grooves 300 into the corresponding cover groove 125 among the plurality of cover grooves 125. Along with this, the air flow flows upward in the plurality of cover grooves 125.

[0169] At this time, the air flow flows upward along the bottom 125b of each of the plurality of cover grooves 125 and heads toward one side in the depth direction Yb. For this reason, the air flow flows from each of the plurality of cover grooves 125 toward one side in the depth direction Yb. As a result, the heat dissipated in the plurality of heat dissipation grooves 300 is discharged to one side in the depth direction Yb of the opening 10a via each of the plurality of cover grooves 125.

[0170] For example, when rainwater or water during car washing hits the in-vehicle electrical component unit 1 and the water flows from the cover upper portion 120 to the cover guide portion 123 by gravity, this water flows down from the cover guide portion 123 to the lower side of the in-vehicle electrical component unit 1 via the heat sink 30 by gravity.

[0171] When the water flows from the cover upper portion 120 to the cover side portions 121 and 122 by gravity, the water flows down from the cover side portions 121 and 122 to the lower side of the in-vehicle electrical component unit 1 via the case side portions 102 and 103 by gravity. As described above, it is possible to prevent rainwater or water during car washing from covering the circuit board 20.

[0172] Furthermore, between the case side portion 102 and the cover side portion 121, an elongated gap 300a extending in the depth direction Yb and a gap 301a connected to the gap 300a and opened to one side in the width direction Yc are provided.

[0173] This can prevent water from entering the internal space 10b of the case portion 11 through the gaps 300a and 301a from the outside of the case portion 11 or the outside of the cover portion 12.

[0174] Also, when rainwater or water during car washing covers the plurality of cover grooves 125 and the plurality of heat dissipation grooves 300, the water flows along the plurality of cover grooves 125 and the plurality of heat dissipation grooves 300. As a result, it is possible to prevent rainwater or water during car washing from covering the circuit board 20.

[0175] Between the case side part 103 and the cover side part 122, an elongated gap 300b extending in the depth direction Yb and a gap 301b connected to this gap 300b and opening to the other side in the width direction Yc are provided.

[0176] This can prevent rainwater and water during car washing from entering the internal space 10b of the case part 11 through the gaps 300b and 301b from the outside of the case part 11 or the outside of the cover part 12.

[0177] Furthermore, the heat dissipation leg part 33 of the heat sink 30 and the case side part 102 are formed such that the distance in the width direction Yc of the gap region 322a is larger than those of the gap regions 321a and 323a. For this reason, it is possible to suppress water from flowing to the other side in the depth direction by capillary action through the gap 320a.

[0178] Therefore, it is possible to prevent water from entering the internal space 10b through the gap 320a from the outside of the case part 11.

[0179] The heat dissipation leg part 34 of the heat sink 30 and the case side part 103 are formed such that the distance in the width direction Yc of the gap region 322b is larger than those of the gap regions 321b and 323b. For this reason, it is possible to suppress water from flowing to the other side in the depth direction by capillary action through the gap 320b.

[0180] Therefore, it is possible to prevent water from entering the internal space 10b through the gap 320b from the outside of the case part 11.

[0181] Further, gaps between the cover upper portion 120 and the cover portion 12 of the case portion 11 are exposed on one side and the other side in the width direction Yc with respect to the hinge portion 13 in the housing 10. When rainwater or water during car washing enters between the upper surface 101a and the cover upper portion 120 and reaches the upper surface 101a, the water flows along the upper surface 101a and the inclined end surface 101c to one side in the width direction Yc due to gravity. Thereafter, the water flows down from the inclined end surface 101c to the case side portion 102. Along with this, the water flows down from the case side portion 102 to the lower side of the in-vehicle electrical component unit 1 due to gravity.

[0182] When rainwater or water during car washing enters between the upper surface 101b and the cover upper portion 120 and reaches the upper surface 101b, the water flows along the upper surface 101b and the inclined end surface 101d due to gravity. Thereafter, the water flows down from the inclined end surface 101d to the case side portion 103. Along with this, the water flows down from the case side portion 103 to the lower side of the in-vehicle electrical component unit 1 due to gravity.

[0183] As described above, it is possible to prevent water from entering the circuit board 20 from the gap between the cover upper portion 120 and the cover portion 12.

[0184] For example, when water enters the internal space 10b of the case portion 11, the water falls to the case bottom portion 104 through the drain port 106 between two adjacent waterproof portions among the waterproof portions 105a to 105h due to gravity. The water that has fallen to this case bottom portion 104 flows down along the case bottom portion 104 due to gravity. Thereafter, the water is discharged from the drain port 107 to one side in the depth direction Yb with respect to the case portion 11.

[0185] On the other hand, the waterproof portions 105a to 105h can block the water below the waterproof portions 105a to 105h in the internal space 10b from advancing upward.

[0186] For example, when washing a vehicle by high-pressure cleaning, if water droplets enter below the waterproof parts 105a to 105h in the internal space 10b, the waterproof parts 105a to 105h can prevent the water droplets from advancing toward the circuit board 20 side from below.

[0187] According to the present embodiment described above, the in-vehicle electrical component unit 1 includes a housing 10 including a case part 11 and a cover part 12 when the direction intersecting the vertical direction Ya is defined as the depth direction Yb. The case part 11 forms an internal space 10b and an opening 10a that opens from the internal space 10b to one side in the depth direction Yb.

[0188] The in-vehicle electrical component unit 1 includes a circuit board 20 housed in the internal space 10b and a heat sink 30 disposed on one side of the circuit board 20 in the depth direction Yb, which releases heat generated from the circuit board 20 to the outside of the case part 11 through the opening 10a. The in-vehicle electrical component unit 1 includes a hinge part 13 that connects the upper end part 100d of the case rear part 100 of the case part 11 and the cover upper part 120 of the cover part 12.

[0189] The state in which the cover part 12 covers the case part 11 from above is defined as the case-cover state (i.e., the first state), and the state in which the cover part 12 is detached from the case part 11 is defined as the case-exposed state (i.e., the second state).

[0190] The hinge part 13 is configured such that, by its deformation, the cover part 12 can be rotated with respect to the case part 11 to switch between one of the case-cover state and the case-exposed state and the other.

[0191] Therefore, when the cover part 12 is in the case-cover state, it is possible to prevent water from entering the internal space of the case part 11 from the outside of the case part 11. As a result, it is possible to provide the in-vehicle electrical component unit 1 in which the housing 10 is devised to prevent water from entering the circuit board 20 in the internal space 10b of the case part 11 from the outside of the case part 11.

[0192] In the in - vehicle electrical component unit 1 of this embodiment configured as described above, the following effects (1) to (21) can be obtained.

[0193] (1) For example, it is conceivable that the housing and the heat radiating fins form an integrated structure. In this case, if the integrated structure is manufactured by die - casting aluminum, there is a risk of increasing the manufacturing cost.

[0194] On the other hand, in this embodiment, the case portion 11 and the heat sink 30 are formed independently. The heat sink 30 is manufactured by extrusion molding. Therefore, an increase in the manufacturing cost of the in - vehicle electrical component unit 1 can be suppressed.

[0195] (2) The housing 10 constitutes an integrated structure in which the case portion 11, the cover portion 12, and the hinge portion 13 are integrated by a resin material. Therefore, the number of parts can be reduced compared to the case where the case portion 11 and the cover portion 12 are formed independently. Therefore, an increase in the manufacturing cost of the in - vehicle electrical component unit 1 can be suppressed.

[0196] (3) The circuit board 20 is formed so as to extend in the vertical direction Ya and the width direction Yc. The width direction Yc intersects the vertical direction Ya and also intersects the depth direction Yb. The heat sink 30 is disposed on one side of the circuit board 20 in the depth direction Yb and includes a heat - radiating base portion 31 formed so as to extend in the vertical direction Ya and the width direction Yc.

[0197] The heat sink 30 is formed so as to protrude from the heat - radiating base portion 31 to one side in the depth direction Yb over the vertical direction Ya, and a plurality of heat - radiating fins 32 arranged in the width direction Yc and radiating heat to the outside of the case portion 11 through the opening 10a are provided. Therefore, the heat generated from the circuit board 20 can be radiated well to the outside of the case portion 11.

[0198] (4) The heat sink 30 forms a heat dissipation groove 300 that is recessed toward the other side in the depth direction Yb over the vertical direction Ya between two adjacent heat dissipation fins 32 among the plurality of heat dissipation fins 32.

[0199] When the cover part 12 is in the case cover state, the cover part 12 is disposed on one side in the vertical direction Ya with respect to the heat dissipation groove 300, and is formed so as to be recessed toward the other side in the depth direction Yb over the vertical direction Ya, and further forms a cover groove 125 that communicates with the heat dissipation groove 300.

[0200] When the cover part 12 is in the case cover state, the cover part 12 is formed such that the bottom 125b of the cover groove 125 moves toward one side in the depth direction Yb as it moves upward. Thereby, the bottom 125b of the cover groove 125 guides the air flow that flows upward from the heat dissipation groove 300 to the cover groove 125 toward one side in the depth direction Yb.

[0201] Thereby, the air flow in the heat dissipation groove 300 can be guided to the outside of the case part 11 through the cover groove 125 and the opening 10a. For this reason, the heat released from the heat dissipation base 31 and the plurality of heat dissipation fins 32 to the plurality of heat dissipation grooves 300 can be favorably released to the outside of the case part 11 through the cover groove 125 and the opening 10a.

[0202] (5) When the cover part 12 is in the case cover state, the cover part 12 includes a cover guide part 123 that is formed so as to cover the upper region 30a of the heat sink 30 from one side in the depth direction Yb.

[0203] When the cover part 12 is in the case cover state, the cover part 12 includes a plurality of cover separation parts 124 that are formed over the vertical direction Ya and arranged at intervals in the width direction Yc. Between two adjacent cover separation parts 124 among the plurality of cover separation parts 124, the cover groove 125 is formed.

[0204] When the cover part 12 is in the case cover state, each of the plurality of cover separation parts 124 is provided with a plurality of recesses 124a formed so as to be recessed on one side in the depth direction Yb. In the plurality of recesses 124a, upper regions 32b of corresponding heat dissipation fins 32 among the plurality of heat dissipation fins 32 are fitted.

[0205] Thereby, it is possible to prevent a gap from occurring between the heat dissipation groove 300 and the cover groove 125. For this reason, an air flow can be favorably guided from the heat dissipation groove 300 to the cover groove 125.

[0206] (6) The heat sink 30 is formed so as to cover the circuit board 20 from one end portion 31a in the width direction Yc, and includes a heat dissipation leg portion 33 that supports one end portion 31a in the width direction Yc of the heat dissipation base portion 31.

[0207] The case portion 11 forms an opening portion 10a, and is disposed on one side in the width direction Yc with respect to the heat dissipation leg portion 33, and includes a case side portion 102 that forms a gap 320a between the case side portion 102 and the heat dissipation leg portion 33. The gap 320a has gap regions 321a, 322a, and 323a.

[0208] The gap region 321a is formed on one side in the depth direction Yb between the heat dissipation leg portion 33 and the case side portion 102. The gap region 322a is formed on the other side in the depth direction Yb with respect to the gap region 321a between the heat dissipation leg portion 33 and the case side portion 102, and communicates with the gap region 321a.

[0209] The gap region 323a is formed on the other side in the depth direction Yb with respect to the gap region 322a between the heat dissipation leg portion 33 and the case side portion 102, and communicates with the gap region 322a. The heat dissipation leg portion 33 and the case side portion 102 are formed such that the gap region 322a has a larger distance in the width direction Yc than the gap regions 321a and 323a.

[0210] This can suppress the flow of water through the gap 320a to the other side in the depth direction Yb due to capillary action. Therefore, it is possible to prevent water from entering the circuit board 20 in the internal space 10b through the gap 320a from the outside of the case portion 11.

[0211] (7) The heat sink 30 is formed to cover the circuit board 20 from the other side end portion 31b in the width direction Yc, and includes a heat radiation leg portion 34 that supports the other side end portion 31b in the width direction Yc of the heat radiation base portion 31.

[0212] The case portion 11 includes a case side portion 103 that forms the opening portion 10a, is disposed on the other side in the width direction Yc with respect to the heat radiation leg portion 34, and forms a gap 320b between the heat radiation leg portion 34. The gap 320b includes gap regions 321b, 322b, 323a.

[0213] The gap region 321b is formed on one side in the depth direction Yb between the heat radiation leg portion 34 and the case side portion 103. The gap region 322b is formed on the other side in the depth direction Yb with respect to the gap region 321b between the heat radiation leg portion 34 and the case side portion 103, and communicates with the gap region 321b.

[0214] The gap region 323a is formed on the other side in the depth direction Yb with respect to the gap region 322b between the heat radiation leg portion 34 and the case side portion 103, and communicates with the gap region 322b. The heat radiation leg portion 34 and the case side portion 103 are formed such that the gap region 322b has a larger distance in the width direction Yc than the gap regions 321b, 323a.

[0215] This can suppress the flow of water through the gap 320b to the other side in the depth direction Yb due to capillary action. Therefore, it is possible to prevent water from entering the circuit board 20 in the internal space 10b through the gap 320b from the outside of the case portion 11.

[0216] (8) The case portion 11 includes a case side portion 102 that is disposed on one side in the width direction Yc with respect to the circuit board 20 and is formed to cover the circuit board 20 from one side in the width direction Yc. When the cover portion 12 is in the case-covering state, the cover portion 12 includes a cover side portion 121 that is disposed on one side in the width direction Yc with respect to the case side portion 102 and is formed to cover the case side portion 102 from one side in the width direction Yc.

[0217] Between the case side portion 102 and the cover side portion 121, a gap 301a that opens to one side in the width direction Yc and a gap 300a that communicates with the gap 301a and is formed across the depth direction Yb are formed.

[0218] Thereby, it is possible to prevent intrusion into the circuit board 20 in the internal space 10b from the outside of the case portion 11 through the gaps 300a and 301a between the case side portion 102 and the cover side portion 121.

[0219] (9) The case portion 11 includes a case side portion 103 that is disposed on the other side in the width direction Yc with respect to the circuit board 20 and is formed to cover the circuit board 20 from the other side in the width direction Yc. When the cover portion 12 is in the case-covering state, the cover portion 12 includes a cover side portion 122 that is disposed on the other side in the width direction Yc with respect to the case side portion 103 and is formed to cover the case side portion 103 from the other side in the width direction Yc.

[0220] Between the case side portion 103 and the cover side portion 122, a gap 301b that opens to the other side in the width direction Yc and a gap 300b that communicates with the gap 301b and is formed across the depth direction Yb are formed.

[0221] Thereby, it is possible to prevent intrusion into the circuit board 20 in the internal space 10b from the outside of the case portion 11 through the gaps 300b and 301b between the case side portion 102 and the cover side portion 122.

[0222] (10) The case part 11 includes a case upper part 101 formed to cover the circuit board 20 from above. When the cover part 12 is in the case-covering state, the cover part 12 includes a cover upper part 120 formed to cover the case upper part 101 from above.

[0223] Accordingly, the case upper part 101 and the cover upper part 120 can prevent water coming from above the case part 11 from entering the circuit board 20 in the internal space 10b.

[0224] (11) On the upper side of the case upper part 101, an upper surface 101a is provided which is formed to slope downward from the other side in the width direction Yc toward the one side in the width direction Yc, guiding water flowing by gravity from the other side in the width direction Yc toward the one side in the width direction Yc.

[0225] Therefore, water can be guided to flow by gravity along the upper surface 101a toward the one side in the width direction Yc. For this reason, water can be made to flow to the one side in the width direction Yc of the case part 11. Thus, it can be prevented from entering the circuit board 20 in the internal space 10b.

[0226] (12) On the upper side of the case upper part 101, an upper surface 101b is provided which is arranged on the other side in the width direction Yc with respect to the upper surface 101a and is formed to slope downward from the one side in the width direction Yc toward the other side in the width direction Yc.

[0227] The upper surface 101b can guide water to flow by gravity from the one side in the width direction Yc toward the other side in the width direction Yc. For this reason, water can be made to flow to the other side in the width direction Yc of the case part 11. Thus, it can be prevented from water from entering the circuit board 20 in the internal space 10b.

[0228] On the upper side of the upper part 101 of the case, waterproof ribs 101e and 101f are provided. The waterproof ribs 101e and 101f are each formed to protrude upward across the width direction Yc from the upper surfaces 101a, 101b, and the inclined end faces 101c, 101d, and prevent water from flowing down from the upper surfaces 101a, 101b to one side in the depth direction Yb by gravity.

[0229] Therefore, it is possible to prevent water from the upper surfaces 101a, 101b from entering the opening 10a. Thus, it is possible to prevent water from entering the circuit board 20 in the internal space 10b.

[0230] (14) The case part 11 is disposed below the heat sink 30 and includes a case bottom 104 that forms the internal space 10b. A drain port 107 for draining water from the internal space 10b is formed between the case bottom 104 and the heat sink 30.

[0231] Therefore, the water that has entered the internal space 10b can be discharged well to the outside of the case part 11 through the drain port 107 and the opening 10a.

[0232] (15) The case bottom 104 is formed in an inclined shape that descends from the other side in the depth direction Yb toward the one side in the depth direction Yb, and guides water to flow by gravity from the other side in the depth direction Yb toward the one side in the depth direction Yb and be discharged from the opening 10a.

[0233] Therefore, the water in the internal space 10b can be discharged well to the outside of the case part 11 by the case bottom 104.

[0234] (16) The case part 11 is disposed above the case bottom 104 and below the circuit board 20, and includes waterproof parts 105a to 105h that prevent water from moving from the case bottom 104 side to the circuit board 20 side. Therefore, it is possible to prevent water from the case bottom 104 side from entering the circuit board 20.

[0235] (17) The upper sides of each of the waterproof portions 105b to 105g are provided with an inclined surface 110a that slopes downward toward one side in the width direction Yc and an inclined surface 110b that slopes downward toward the other side in the width direction Yc.

[0236] Thus, the water on the waterproof portions 105b to 105g can be favorably drained by gravity to one side or the other side in the width direction Yc.

[0237] (18) The waterproof portions 105a to 105h are arranged in the width direction Yc. A drain port 106 for discharging water is formed between two adjacent waterproof portions among the waterproof portions 105a to 105h. Thus, the water above the waterproof portions 105a to 105h can be discharged to the lower side of the waterproof portions 105a to 105h.

[0238] (19) One side region 108b of the waterproof portion 105b in the width direction Yc is arranged to overlap with the other side region 109a of the waterproof portion 105a in the vertical direction Ya.

[0239] Therefore, while forming the drain port 106 between the one side region 108b of the waterproof portion 105b and the other side region 109a of the waterproof portion 105a, it is possible to block the progress of water droplets from the lower side to the upper side of the waterproof portions 105a and 105b. For this reason, for example, it is possible to prevent the water droplets generated by high-pressure cleaning from progressing from the lower side to the circuit board 20 side with respect to the waterproof portions 105a and 105b.

[0240] Also, in two adjacent waterproof portions among the waterproof portions 105b, 105c, 105d, 105e, 105f, 105g, and 105h, one side region and the other side region are configured in the same manner as the waterproof portions 105a and 105b. For this reason, similar to the waterproof portions 105a and 105b, while forming the drain port 106, it is possible to block the progress of water droplets from the lower side to the upper side of the two waterproof portions.

[0241] (Other embodiments)

[0242] (a) In the above embodiment, an example in which a heat dissipation sheet 40 is disposed between the circuit board 20 and the heat sink 30 to enhance the thermal conductivity of the circuit board 20 and the heat sink 30 has been described. However, the present invention is not limited to this, and a heat dissipation gel may be disposed between the circuit board 20 and the heat sink 30.

[0243] (b) In the above embodiment, an example in which the upper case 101 is provided with upper surfaces 101a and 101b has been described. However, instead of this, the upper case 101 may be provided with one upper surface. One upper surface is formed so as to face downward as it proceeds toward one side or the other side in the width direction Yc.

[0244] (c) In the above embodiment, an example in which the upper case 101 is provided with waterproof ribs 101e and 101f has been described. However, instead of this, the upper case 101 may be provided with one waterproof rib.

[0245] (d) In the above embodiment, an example in which one side region 108b in the width direction Yc of the waterproof portion 105b is disposed above the other side region 109a in the width direction Yc of the waterproof portion 105a has been described.

[0246] However, instead of this, one side region 108b in the width direction Yc of the waterproof portion 105b may be disposed below the other side region 109a in the width direction Yc of the waterproof portion 105a.

[0247] Similarly, the waterproof portions 105b to 105h may be configured as follows. That is, one side region 108c in the width direction Yc of the waterproof portion 105c is disposed below the other side region 109b in the width direction Yc of the waterproof portion 105b. One side region 108d in the width direction Yc of the waterproof portion 105d is disposed below the other side region 109c in the width direction Yc of the waterproof portion 105c. One side region 108e in the width direction Yc of the waterproof portion 105e is disposed below the other side region 109d in the width direction Yc of the waterproof portion 105d.

[0248] One side region 108f in the width direction Yc of the waterproof portion 105f is disposed below the other side region 109e in the width direction Yc of the waterproof portion 105e. One side region 108g in the width direction Yc of the waterproof portion 105g is disposed below the other side region 109f in the width direction Yc of the waterproof portion 105f. One side region 108h in the width direction Yc of the waterproof portion 105h is disposed below the other side region 109g in the width direction Yc of the waterproof portion 105g.

[0249] (e) In the above embodiment, an example in which the waterproof portions 105b to 105g each include the inclined surfaces 110a and 110b has been described. However, alternatively, the waterproof portions 105b to 105g may be configured as follows "1" and "2", respectively. "1" An inclined surface is provided above at least one of the waterproof portions 105b to 105g, the inclined surface being configured to descend from the other side end portion in the width direction Yc toward the one side end portion in the width direction Yc.

[0250] "2" An inclined surface is provided above at least one of the waterproof portions 105b to 105g, the inclined surface being configured to descend from the one side end portion in the width direction Yc toward the other side end portion in the width direction Yc.

[0251] (f) In the above embodiment, an example in which the upper case 101 of the case portion 11 is provided with the upper surfaces 101a, 101b, the inclined end surfaces 101c, 101d has been described. However, alternatively, the upper case 101 of the case portion 11 may be provided with one upper surface.

[0252] That is, one upper surface may be configured to descend from the one side end portion in the width direction Yc toward the other side end portion in the width direction Yc. Alternatively, one upper surface may be configured to descend from the other side end portion in the width direction Yc toward the one side end portion in the width direction Yc.

[0253] (g) In the above-described embodiment, an example in which the circuit board 20 is used as an electrical component has been described. However, instead of this, various electrical components other than the circuit board 20 (for example, an electric motor, etc.) may be used as the electrical component.

[0254] (h) Note that the present disclosure is not limited to the above-described embodiments, and can be appropriately modified within the scope described in the claims. Also, the above-described embodiments are not independent of each other, and can be appropriately combined except in cases where the combination is clearly impossible. Further, in the above-described embodiments, it goes without saying that the elements constituting the embodiments are not necessarily essential except in cases where it is clearly specified as essential or is considered to be clearly essential in principle. Also, in the above-described embodiments, when numerical values such as the number, numerical value, amount, range, etc. of the components of the embodiment are mentioned, they are not limited to that specific number except in cases where it is clearly specified as essential or is clearly limited to a specific number in principle. Also, in the above-described embodiments, when referring to the shape, positional relationship, etc. of the components, etc., they are not limited to that shape, positional relationship, etc. except in cases where it is clearly specified or is clearly limited to a specific shape, positional relationship, etc. in principle.

Explanation of Reference Numerals

[0255] 1 Vehicle-mounted electrical unit 10 Housing 11 Case part 12 Cover part 13 Hinge part 20 Circuit board 30 Heat sink 31 Heat dissipation base 32 Heat dissipation fins

Claims

1. When the direction intersecting the vertical direction (Ya) is defined as the first direction (Yb), a case part (11) forming an internal space (10b) and an opening part (10a) that opens to one side in the first direction from the internal space, a cover part (12), and a housing (10) including a hinge part (13) connecting the case part and the cover part; an electrical component (20) housed in the internal space; a heat sink (30) disposed on one side in the first direction with respect to the electrical component and discharging heat generated from the electrical component to the outside of the case part through the opening part. When the state where the cover part covers the case part from above is defined as the first state and the state where the cover part is detached from the case part is defined as the second state, the hinge part is configured to be able to switch from one of the first state and the second state to the other by rotating the cover part with respect to the case part due to its deformation, and is an in-vehicle electrical unit.

2. When the direction intersecting the vertical direction and intersecting the first direction is defined as the second direction (Yc), the electrical component is formed to extend in the vertical direction and the second direction, the heat sink includes a heat dissipation base part (31) disposed on one side in the first direction with respect to the electrical component and formed to extend in the vertical direction and the second direction, and a plurality of heat dissipation fins (32) protruding from the heat dissipation base part to one side in the first direction over the vertical direction and arranged in the second direction and dissipating heat to the outside of the case part through the opening part. The in-vehicle electrical unit according to Claim 1.

3. The heat sink forms a heat dissipation groove (300) recessed to the other side in the first direction over the vertical direction between two adjacent heat dissipation fins among the plurality of heat dissipation fins, when the cover part is in the first state, the cover part is disposed above the heat dissipation groove and is formed to be recessed to the other side in the first direction over the vertical direction, and further forms a cover groove (125) communicating with the heat dissipation groove. Furthermore, when the cover portion is in the first state, the cover portion is formed such that the bottom portion (125b) of the cover groove moves upward toward one side in the first direction, and guides the air flow flowing upward from the heat dissipation groove to flow toward one side in the first direction. The in-vehicle electrical component unit according to claim 2.

4. When the cover portion is in the first state, the cover portion includes a plurality of cover separation portions (124) formed in the vertical direction and arranged in the second direction. Between two adjacent cover separation portions among the plurality of cover separation portions, the cover groove is formed. Furthermore, when the cover portion is in the first state, each of the plurality of cover separation portions is provided with a plurality of recesses (124a) formed so as to be recessed toward one side in the first direction. The in-vehicle electrical component unit according to claim 3, wherein an upper region (32b) of a corresponding heat dissipation fin among the plurality of heat dissipation fins is fitted into each of the plurality of recesses.

5. The heat sink is formed to cover the electrical component from one side in the second direction, and includes a heat dissipation leg portion (33) that supports one side (31a) in the second direction of the heat dissipation base portion. The case portion forms the opening portion, and includes a case side portion (102) that is disposed on one side in the first direction with respect to the heat dissipation leg portion and forms a gap (320a) therebetween. The gap has a first gap region (321a) formed on one side in the first direction between the heat dissipation leg portion and the case side portion, and a second gap region (322a) formed on the other side in the first direction with respect to the first gap region between the heat dissipation leg portion and the case side portion and communicating with the first gap region. The heat dissipation leg portion and the case side portion are formed such that the distance in the second direction of the second gap region is larger than that of the first gap region, thereby suppressing water from flowing to the other side in the first direction due to capillary action through the gap. The in-vehicle electrical component unit according to claim 2.

6. The gap has a third gap region (323a) formed on the other side in the first direction with respect to the second gap region between the heat dissipation leg portion and the case side portion and communicating with the second gap region. The heat-radiating leg portion and the case side portion are formed such that the distance in the second direction of the second gap region is larger than that of the first gap region and the third gap region, thereby suppressing water from flowing to the other side in the second direction by capillary action in the gap. The in-vehicle electrical component unit according to claim 5.

7. When the heat-radiating leg portion is defined as a first heat-radiating leg portion, the case side portion is defined as a first case side portion, and the gap is defined as a first gap, the heat sink is formed to cover the electrical component from the other side in the second direction, and includes a second heat-radiating leg portion (34) that supports the other end portion (31b) in the second direction of the heat-radiating base portion. The case portion forms the opening portion and is disposed on the other side in the second direction with respect to the second heat-radiating leg portion, and includes a second case side portion (103) that forms a second gap (320b) between the second heat-radiating leg portion. The second gap has a fourth gap region (321b) formed on one side in the first direction between the second heat-radiating leg portion and the second case side portion, and is formed on the other side in the first direction with respect to the fourth gap region between the heat-radiating leg portion and the case side portion and communicates with the fourth gap region. It has a fifth gap region (322b). The second heat-radiating leg portion and the second case side portion are formed such that the distance in the second direction of the fifth gap region is larger than that of the fourth gap region, thereby suppressing water from flowing to the other side in the second direction by capillary action in the second gap. The in-vehicle electrical component unit according to claim 6.

8. The second gap has a sixth gap region (323b) formed on the other side in the first direction with respect to the fifth gap region between the second heat-radiating leg portion and the second case side portion and communicates with the fifth gap region. The second heat-radiating leg portion and the second case side portion are formed such that the distance in the second direction of the fifth gap region is larger than that of the fourth gap region and the sixth gap region, thereby suppressing water from flowing to the other side in the second direction by capillary action in the second gap. The in-vehicle electrical component unit according to claim 7.

9. When a direction that intersects the vertical direction and intersects the first direction is defined as a second direction (Yc), The case portion includes a case side portion (102) that is disposed on one side in the second direction with respect to the electrical component and is formed to cover the electrical component from one side in the second direction. When the cover portion is in the first state, the cover portion includes a cover side portion (121) that is disposed on one side in the second direction with respect to the case side portion and is formed to cover the case side portion from one side in the second direction. In the in-vehicle electrical unit according to claim 1, a first gap (301a) that opens to one side in the second direction and a second gap (300a) that communicates with the first gap and is formed across the first direction are formed between the case side portion and the cover side portion.

10. When the case side portion is regarded as a first case side portion, the cover side portion is regarded as a first cover side portion, and the gap is regarded as a first gap. The case portion includes a second case side portion (103) that is disposed on the other side in the second direction with respect to the electrical component and is formed to cover the electrical component from one side in the second direction. When the cover portion is in the first state, the cover portion includes a second cover side portion (122) that is disposed on the other side in the second direction with respect to the second case side portion and is formed to cover the second case side portion from the other side in the second direction. In the in-vehicle electrical unit according to claim 9, a third gap (301b) that opens to the other side in the second direction and a fourth gap (300b) that communicates with the third gap and is formed across the first direction are formed between the second case side portion and the second cover side portion.

11. The case portion includes a case upper portion (101) that is formed to cover the electrical component from above. The in-vehicle electrical unit according to claim 1, wherein when the cover portion is in the first state, the cover portion includes a cover upper portion (120) that is formed to cover the case upper portion from above.

12. When a direction that intersects the vertical direction and also intersects the first direction is defined as a second direction (Yc). On the upper side of the case upper portion. The in-vehicle electrical unit according to claim 11, wherein an upper surface (101a) is provided which is formed to slope downward from the other side in the second direction toward the one side in the second direction so as to guide water from the other side in the second direction to the one side in the second direction by gravity.

13. When a direction that intersects the vertical direction and also intersects the first direction is defined as a second direction (Yc), on the upper side of the upper part of the case, the in-vehicle electrical component unit according to claim 11, wherein an upper surface (101b) is provided which is formed so as to descend from one side in the second direction toward the other side in the second direction, and guides water to flow from one side in the second direction to the other side in the second direction by gravity.

14. When a direction that intersects the vertical direction and also intersects the first direction is defined as a second direction (Yc), on the upper side of the upper part of the case, an upper surface (101a, 101b) formed across the second direction, and the in-vehicle electrical component unit according to claim 11, wherein waterproof ribs (101e, 101f) are provided which are formed so as to protrude upward across the second direction from the upper surface, and suppress water from flowing down from the upper surface to one side in the first direction by gravity.

15. The case part is disposed below the heat sink and includes a case bottom (104) that forms the internal space, the in-vehicle electrical component unit according to claim 1, wherein a drain port (107) for draining water from within the internal space is formed between the case bottom and the heat sink.

16. The case bottom is formed in an inclined shape that descends from the other side in the first direction toward the one side in the first direction, and guides the water so that the water flows by gravity from the other side in the first direction to the one side in the first direction and is discharged from the opening. The in-vehicle electrical component unit according to claim 15.

17. The case part is disposed above the case bottom and below the electrical component, and includes a waterproof part (105a to 105h) that suppresses water from moving from the case bottom side to the electrical component side. The in-vehicle electrical component unit according to claim 15.

18. When a direction that intersects the vertical direction and also intersects the first direction is defined as a second direction (Yc), the in-vehicle electrical component unit according to claim 17, wherein on the upper side of the waterproof part, inclined surfaces (110a, 110b) are formed that descend toward one side or the other side in the second direction.

19. The case part includes a plurality of the waterproof parts (105a to 105h) arranged in the second direction, The in-vehicle electrical component unit according to claim 18, wherein a drain port (106) for discharging water is formed between two adjacent ones of the plurality of waterproof portions.

20. In one of the two adjacent waterproof portions, one side region in the second direction is defined as one side region (108b to 108h) of the waterproof portion. When the other side region in the second direction in the other of the two adjacent waterproof portions is defined as the other side region (109a to 109g) of the waterproof portion. The drain port is formed between the one side region of the waterproof portion and the other side region of the waterproof portion. The in-vehicle electrical component unit according to claim 19, wherein the one side region of the waterproof portion and the other side region of the waterproof portion are arranged so as to overlap in the vertical direction.

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