Rotation detector

Patent metadata

Field	Value
Publication number	US-9523592-B2
Application number	US-201514794999-A
Country	US
Kind code	B2
Filing date	Jul 9, 2015
Priority date	Jul 11, 2014
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

A rotation detector includes a sensor element, a signal wire connected to the sensor element, the signal wire transmitting the rotation detecting signal, a sensor coating portion integrally coating the sensor element and an end of the signal wire connected to the sensor element, and a sensor attachment member at least supporting a part of the sensor coating portion and a part of the signal wire. The signal wire includes a curved portion. The sensor attachment member has a surface provided with depression portions. When the sensor attachment member is being molded, the depression portions are engaged with a pair of guide members which protrude toward the curved portion in a cavity of a molding die in a direction perpendicular to a surface including the curved portion, and the guide members protrude in directions opposite to each other.

First claim

What is claimed is:

1. A rotation detector comprising:
a sensor element generating a rotation detecting signal based on a rotation state of a rotation member;
a signal wire connected to the sensor element, the signal wire transmitting the rotation detecting signal;
a sensor coating portion integrally coating the sensor element and an end of the signal wire connected to the sensor element; and
a sensor attachment member being made of a resin molding material, the sensor attachment member at least supporting a part of the sensor coating portion and a part of the signal wire, wherein
the signal wire includes a curved portion that is curved in the sensor attachment member,
the sensor attachment member has a surface provided with depression portions, and
when the sensor attachment member is being molded, the depression portions are engaged with a pair of guide members which protrude toward the curved portion in a cavity of a molding die in a direction perpendicular to a surface including the curved portion, and the guide members protrude in directions opposite to each other.

2. The rotation detector according to claim 1 , wherein
the pair of the guide members has a length which is established in a case where the guide members are not in contact with the signal wire at the same time when the sensor attachment member is being molded.

3. The rotation detector according to claim 1 , wherein
the molding die includes a pair of movable molding dies,
when the sensor attachment member is being molded, the movable molding dies are placed at positions opposite to each other, and mold-split surfaces of the movable molding dies are located on the surface including the curved portion, and
the guide members are integrally bonded to the movable molding dies, respectively.

4. The rotation detector according to claim 3 , wherein
the sensor attachment member includes an attachment stay extending from a center that is a center axis of the signal wire connected to the sensor element in a radial direction of the signal wire,
the attachment stay is provided with an attachment hole penetrating the attachment stay, and
at least a part of the attachment hole is located on the surface including the curved portion.

5. The rotation detector according to claim 1 , wherein
the sensor element includes a Hall-effect IC.

6. The rotation detector according to claim 1 , wherein
the curved portion is interposed between the depression portions.

Assignees

• Denso Corp

Inventors

• Takasaki Mitsuru

Classifications

• G01P3/48

  by measuring frequency of generated current or voltage {(in general G01R23/00)} · CPC title

• G01P3/481

  of pulse signals · CPC title

• G01P1/026

  for speed measuring devices, e.g. pulse generator · CPC title

• G01D11/30

  Supports specially adapted for an instrument; Supports specially adapted for a set of instruments · CPC title

• G01D11/245 Primary

  Housings for sensors · CPC title