Rotational angle sensors and throttle devices

A throttle device comprising:

• a throttle body defining an intake air channel;
• a throttle valve operable to open and close the intake air channel for controlling an amount of an intake air flowing through the intake air channel;
• a rotary member coupled to the throttle valve;
• at least two magnets attached to the rotary member;
• and
• a rotational angle sensor attached to the throttle body for detecting a rotational angle of the throttle valve, the rotational angle sensor comprising:
• a magnetic detection device including a sensing section constructed to detect a change of a magnetic field produced by the at least two magnets attached to the rotary member;
• a protective member constructed to protect at least the sensing section of the magnetic detection device;
• and
• a housing member attached to the throttle body and molded integrally with the magnetic detection device and the protective member by an insertion molding process, such that the magnetic detection device and the protective member are embedded within the housing member;
• wherein the sensing section has at least one projection, and the protective member has at least one engaging recess engaging with the at least one projection, such that the sensing section is positioned relative to the protective member;
• and
• wherein the sensing section has a first projection and a second projection disposed on opposite sides of the sensing section, and the protective member has a first engaging recess and a second engaging recess for engaging the first projection and the second projection, respectively.

A rotational angle sensor comprising:

• a magnetic detection device including a sensing section and constructed to detect a change of a magnetic field produced by at least two magnets attached to a rotary member;
• a positioning member;
• and
• a housing member molded integrally with the magnetic detection device and the positioning member by an insertion molding process, such that the magnetic detection device and the protective member are embedded within the housing member;
• wherein the sensing section has at least one projection, and the positioning member has at least one engaging recess engaging with the at least one projection, such that the sensing section is positioned relative to the positioning member;
• and
• wherein the sensing section has a first projection and a second projection disposed on opposite sides of the sensing section, and the protective member has a first engaging recess and a second engaging recess for engaging the first projection and the second projection, respectively.

A throttle device comprising:

• a throttle body defining an intake air channel;
• a throttle valve operable to open and close the intake air channel for controlling an amount of an intake air flowing through the intake air channel;
• a rotary member coupled to the throttle valve;
• at least two magnets attached to the rotary member;
• and
• a rotational angle sensor attached to the throttle body for detecting a rotational angle of the throttle valve, the rotational angle sensor comprising:
• a magnetic detection device including a sensing section constructed to detect a change of a magnetic field produced by the at least two magnets attached to the rotary member;
• a positioning member;
• and
• a housing member attached to the throttle body and integrated with the magnetic detection device and the positioning member by an insertion molding process, such that the magnetic detection device and the protective member are embedded within the housing member;
• wherein the sensing section has at least one projection, and the positioning member has at least one engaging recess engaging with the at least one projection, such that the sensing section is positioned relative to the positioning member;
• and
• wherein the sensing section has a first projection and a second projection disposed on opposite sides of the sensing section, and the protective member has a first engaging recess and a second engaging recess for engaging the first projection and the second projection, respectively.

A sensor comprising:

• a magnetic detection device having a sensing section constructed to detect a change of a magnetic field;
• a first member made of a first resin material and engaged with at least the sensing section of the magnetic detection device;
• and
• a second member made of a second resin material and molded integrally with the magnetic detection device and the first member, so that the magnetic detection device and the first member are embedded within the second member;
• wherein the sensing section has at least one projection, and the first member has at least one engaging recess engaging with the at least one projection, such that the sensing section is positioned relative to the first member;
• and
• wherein the sensing section has a first projection and a second projection disposed on opposite sides of the sensing section, and the protective member has a first engaging recess and a second engaging recess for engaging the first projection and the second projection, respectively.

A sensor comprising:

• a magnetic detection device having a sensing section constructed to detect a change of a magnetic field;
• a first member made of a first resin material;
• and
• a second member made of a second resin material and holding the magnetic detection device and the first member,
• wherein the sensing section has a first projection and a second projection disposed on opposite sides of the sensing section, and the first member is provided with a first engaging recess and a second engaging recess engaged with the first projection and the second projection, respectively, and
• wherein the magnetic detection device and the first member are embedded within the second member.