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US 12,764,851 B2Granted
Power tools with high-emissivity heat sinks
AssigneeMilwaukee Electric Tool Corporation
InventorSteven LCB Hartig, Jr.
Life of this patent
Estimating the term…
Abstract
Power tool (10) with high emissivity heat sinks (66). One embodiment provides a power tool (10) including a power source, a motor (46), and a power switching network (58) coupled between the power source and the motor (46). The power switching network (58) includes a plurality of switches (62). A heat sink (66) is in a heat-transfer relationship with the plurality of switches (62). The heat sink (66) includes a high emissivity material having an emissivity of greater than or equal to 0.1 and/or a high emissivity finish to increase the emissivity of the heat sink.
Claims20
A power tool comprising:
- a power source;
- a motor;
- a power switching network coupled between the power source and the motor including a plurality of switches;
- and
- a heat sink in a heat-transfer relationship with the plurality of switches, wherein the heat sink includes a high emissivity material having an emissivity of greater than or equal to 0.4;
- and
- a printed circuit board, wherein the plurality of switches are connected to the printed circuit board,
- the heat sink is mounted to the printed circuit board and extends in a direction perpendicular to the printed circuit board such that a length dimension of the heat sink in the direction perpendicular to the printed circuit board is larger than a length dimension of the heat sink in a direction parallel to the printed circuit board, and
- the plurality of switches are mounted to the heat sink such that a larger surface area of a body portion of each of the plurality of switches is in the heat-transfer relationship with the heat sink.
6 more elements
A power tool comprising:
- a power source;
- a motor;
- a power switching network coupled between the power source and the motor including a plurality of switches;
- and
- a heat sink in a heat-transfer relationship with the plurality of switches, wherein the heat sink includes a high emissivity material having an emissivity of greater than or equal to 0.4;
- and
- a printed circuit board, wherein the plurality of switches are connected to the printed circuit board,
- the plurality of switches are surface mounted to the printed circuit board;
- and
- wherein the heat sink is provided above the plurality of switches such that a first larger surface area of a body portion of the plurality of switches is in a facing relationship with the printed circuit board and a second larger surface area of the body portion of the plurality of switches is in the heat-transfer relationship with the heat sink.
7 more elements
A power tool comprising:
- a power source;
- a motor;
- a power switching network coupled between the power source and the motor including a plurality of switches,
- wherein each of the plurality of switches includes a body portion, connection terminals extending from a first side of the body portion, and a mounting portion extending from a second side of the body portion opposite the first side;
- a heat sink in a heat-transfer relationship with the plurality of switches, wherein the heat sink includes a high emissivity material having an emissivity of greater than or equal to 0.4;
- and
- a printed circuit board, wherein the plurality of switches are connected to the printed circuit board,
- the heat sink has a T-shaped structure such that a bottom of the heat sink forming the bottom of the T-shaped structure is in contact with the printed circuit board
- a top of the T-shaped structure includes a horizontal portion having a substantially similar thickness as a vertical portion of the T-shaped structure, and
- the plurality of switches are mounted to the heat sink using a fastener inserted through the mounting portion of each of the plurality of switches such that a larger surface area of the body portion of each of the plurality of switches is in the heat-transfer relationship with the heat sink.
7 more elements
Dependencies are inferred from the claim text.