Electric pump

Patent metadata

Field	Value
Publication number	US-12088175-B2
Application number	US-202217848402-A
Country	US
Kind code	B2
Filing date	Jun 24, 2022
Priority date	Jun 25, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

An electric pump includes a motor including a rotor rotatable about an axis extending in an axial direction and a stator with a coil wire, a pump connected to the rotor, a circuit board on a first side in the axial direction of the motor, and a coil guide between the motor and the circuit board. The coil wire extends to the first side in the axial direction and is connected to the circuit board. The coil guide includes a first portion guiding the coil wire along the axial direction, and a second portion which faces the motor and in which the first portion is opened. The second portion is a surface inclined to the first side in the axial direction toward an opening of the first portion. A width of the second portion as viewed from the axial direction decreases toward the opening of the first portion.

First claim

What is claimed is:

1. An electric pump comprising:
a motor including a rotor portion rotatable about a central axis extending in an axial direction and a stator portion around which a coil wire is wound;
a pump mechanism connected to the rotor portion;
a circuit board provided on a first side in the axial direction of the motor; and
a coil guide that is arranged between the motor and the circuit board and guides the coil wire,
wherein the coil wire extends to the first side in the axial direction and is connected to the circuit board,
the coil guide includes:
a first coil guide portion that guides the coil wire along the axial direction; and
a second coil guide portion which is provided on a facing surface facing the motor and in which the first coil guide portion is opened,
the second coil guide portion is an inclined surface inclined to the first side in the axial direction toward an opening portion of the first coil guide portion, and
a width of the second coil guide portion as viewed from the axial direction decreases toward the opening portion of the first coil guide portion.

2. The electric pump according to claim 1 , wherein the first coil guide portion is a through hole.

3. The electric pump according to claim 2 , wherein a hole diameter of the first coil guide portion is 1.5 times or less a wire diameter of the coil wire.

4. The electric pump according to claim 1 , wherein an opening portion of the first coil guide portion is located in an end portion on a first side or a second side in a circumferential direction in the second coil guide portion.

5. The electric pump according to claim 1 , wherein
the coil guide includes three pairs of the first coil guide portions and three pairs of the second coil guide portions, and
a pair of the second coil guide portions are arranged adjacent to each other when viewed from the axial direction, and in each of the second coil guide portions, an opening portion of the first coil guide portion is arranged in an end portion on a side of the second coil guide portion that is adjacent.

6. The electric pump according to claim 1 , wherein the coil guide includes a surrounding rib provided on the facing surface and surrounding the second coil guide portion when viewed from the axial direction.

7. The electric pump according to claim 1 , wherein
the coil guide includes:
a circumferential rib provided on the facing surface and extending along a circumferential direction; and
a radial rib provided on the facing surface and extending along a radial direction, and
the circumferential rib and the radial rib are connected to each other.

8. The electric pump according to claim 1 , wherein an inclination angle of the inclined surface increases as approaching the first coil guide portion.

9. The electric pump according to claim 8 , wherein the inclined surface is curved in an arc shape.

Assignees

• Nidec Tosok Corp

Inventors

• Sakata Tomohiro
• Kataoka Shigehiro

Classifications

• H02K11/38

  Control circuits or drive circuits associated with geared commutator motors of the worm-and-wheel type · CPC title

• H02K3/522

  for generally annular cores with salient poles · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• H02K2203/03

  Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures for connecting the winding terminations · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title