# US 12,215,936 B2 · Heat sink for an electronic board of a motor vehicle motor-driven fan unit

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- Number: US 12,215,936 B2
- Document ID: US12215936B2
- Status: Granted
- Kind: B2
- Application number: 17/430,149
- Filed: 2020-02-11
- Published: 2022-03-31
- Granted: 2025-02-04
- Earliest claimed: 2019-02-12
- Assignees: Valeo Systemes Thermiques
- Applicants: Valeo Systemes Thermiques
- Inventors: Ismaël Franco; Zhenxia Ma
- Web page: https://patentgrep.com/patent/US12215936B2

## CPC

- F28F 3/04: the means being integral with the element
- F04D 25/06: the pump being electrically driven (F04D25/08 takes precedence)
- F04D 29/5813: {Cooling the control unit}
- F28F 13/02: by influencing fluid boundary (boundary-layer control in general F15D)
- F28F 13/06: by affecting the pattern of flow of the heat-exchange media {(F28F13/003 takes precedence; static flow control means in header boxes F28F9/026)}
- F28F 13/12: by creating turbulence, e.g. by stirring, by increasing the force of circulation (F28F13/08 takes precedence)
- F28F 13/185: {Heat-exchange surfaces provided with microstructures or with porous coatings}
- H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)}
- H05K 7/20509: {Multiple-component heat spreaders; Multi-component heat-conducting support plates; Multi-component non-closed heat-conducting structures}
- H05K 7/20918: {the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels}
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

The invention relates to a heat sink for an electronic board of a motor vehicle motor-driven fan unit, comprising a surface (2) intended for exchanging heat with an air flow set in motion by the motor-driven fan unit, referred to as exchange surface (2), said exchange surface (2) comprising a planar portion (3) arranged so that, in a position installed in the motor-driven fan unit, the air flow set in motion by the motor-driven fan unit flows substantially parallel to said planar portion (3), the exchange surface (2) also comprising a set of blind recesses (4) flush with said planar portion (3).

## Claims

### Claim 1

A heat sink for an electronic board of a motor-driven fan unit of a motor vehicle, comprising
an exchange surface configured for exchange of heat with an air flow set in motion by the motor-driven fan unit, said exchange surface comprising:
a planar portion configured such that, in a position installed in the motor-driven fan unit, the air flow set in motion by the motor-driven fan unit flows substantially parallel to said planar portion; and
a set of blind cavities flush with said planar portion,
wherein each blind cavity comprises a part in a form of a truncated pyramid on a polygonal base and/or a part of constant cross section, and
wherein the polygonal base is a hexagonal base.

### Claim 2 (depends on 1)

The heat sink as claimed in claim 1, wherein the set of blind cavities is arranged in a quadrilateral, wherein the quadrilateral is rectangular, grid and/or in an offset configuration and/or in a honeycomb configuration.

### Claim 3 (depends on 1)

The heat sink as claimed in claim 1, wherein the blind cavities have the same orientation.

### Claim 4 (depends on 1)

The heat sink as claimed in claim 1, wherein a ratio between a depth of each blind cavity and a length of one side of the polygonal base is comprised between 0.05 and 0.5.

### Claim 5 (depends on 1)

The heat sink as claimed in claim 1, wherein the exchange surface is made from a material of aluminum alloy or of plastic.