Rotation angle detector having first molded member integrating magnetic sensing element and output terminal and second molded member integrating stator core and first molded member

• US 6,407,543 B1
• Filed: 10/13/2000
• Issued: 06/18/2002
• Est. Priority Date: 11/01/1999
• Status: Expired due to Term

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Kono, Yoshiyuki, Kubota, Takamitsu, Hamaoka, Takashi, Hagio, Hirofumi, Kondo, Tomokazu
• Primary Examiner(s): Lefkowitz, Edward
• Assistant Examiner(s): Aurora, Reena
• Application Number:
  US09/689,634
• Time in Patent Office: 613 Days
• Field of Search: 324/207.2, 324/207.21, 324/207.25, 324/174, 324/207.15, 324/207.16, 336/234, 336/96, 123/617
• US Class Current: 324/207.25
• CPC Class Codes: B60K 35/60 Instruments characterised by their location or relative disposition in or on vehicles arrangements of lighting devices on dashboards B60Q3/10
• CPC Class Codes: F02D 11/106 Detection of demand or actuation
• CPC Class Codes: F02D 2200/0404 Throttle position
• CPC Class Codes: F05C 2201/021 Aluminium
• CPC Class Codes: F16K 1/221 specially adapted operating means therefor operating means per se F16K31/00
• CPC Class Codes: F16K 31/041 for rotating valves F16K31/055 takes precedence
• CPC Class Codes: F16K 31/535 for rotating valves F16K31/54 takes precedence
• CPC Class Codes: F16K 37/0033 using a permanent magnet, e.g. in combination with a reed relays
• CPC Class Codes: G01D 11/30 Supports specially adapted for an instrument; Supports specially adapted for a set of instruments
• CPC Class Codes: G01D 2205/40 Position sensors comprising arrangements for concentrating or redirecting magnetic flux
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06

Abstract

Non-contact type Hall ICs detecting an rotation angle of a throttle valve, a stator core strengthening a magnetic field around the Hall ICs, a lead frame connecting the Hall ICs to an outside ECU are integrated in a sensor cover by resin molding. Thus, the Hall ICs, the stator core, and the lead frame are accurately positioned in the sensor cover. As a result, the Hall ICs are accurately positioned with respect to a permanent magnet disposed in a shaft side of the throttle valve, thereby improving an accuracy of detecting the rotation angle of the throttle valve.

Claims

1. A rotation angle detector comprising:

a rotor core rotating with a rotary member of which a rotation angle is detected, said rotor core including a magnet generating a magnetic force;

a non-contact type magnetic sensing element receiving the magnetic force of said magnet to detect the rotation angle of said rotary member;

an output terminal connected to said non-contact type magnetic sensing element to output an output signal of said non-contact type magnetic sensing element;

a first resin molded member integrating and supporting said non-contact type magnetic sensing element and said output terminal by resin molding;

a stator core forming a magnetic circuit with said rotor core said stator core strengthening the magnetic force around said non-contact type magnetic sensing element; and

a second resin molded member integrating and supporting said stator core and said first resin molded member by resin molding.

2. The rotation angle detector according to claim 1, wherein:

said stator core includes;

a first stator core portion provided by stacking a first plurality of magnetic plates in a thickness direction thereof,

a second stator core portion provided by stacking a second plurality of magnetic plates in a thickness direction thereof, and

a non-magnetic plate connecting an end surface of said first stator core portion to an end surface of said second stator core portion; and

said first stator core portion and said second stator core portion defining a magnetic sensing gap having a predetermined width therebetween.

3. The rotation angle detector according to claim 2, wherein said first plurality of magnetic plates stacked to provide said first stator core portion are semi-disk magnetic plates and wherein the second plurality of magnetic plates providing said second stator core portion are also semi-disk magnetic plates.

4. The rotation angle detector according to claim 1, wherein said non-contact type magnetic sensing element includes two element parts disposed side by side in parallel at a 180 degree interval so as to be facing in opposite directions.

5. The rotation angle detector according to claim 1, wherein said non-contact type magnetic sensing element includes a plurality of element parts disposed in series facing a same direction.

6. The rotation angle detector according to claim 1, wherein said magnet includes first and second half arc portions, the first half arc portion having north pole located radially inside and south pole located radially outside and said second half arc portion having south pole located radially inside and north pole located radially outside.