The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 1990
Filed:
Oct. 18, 1988
Hiroshi Otsuka, Katsuta, JP;
Shigeo Tamaki, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A throttle actuator for controlling a throttle valve disposed in the intake passage of an internal combustion engine in accordance with a signal representing the throttle opening demand. The throttle actuator has a rotary type acutator motor and a coolant pipe arranged in a portion of the actuator motor or in the vicinity of the actuator motor so that heat generated in the actuator motor is effectively absorbed by coolant which branches from the engine coolant line. The rotary type actuator motor can stably operated even under severe environment condition so as to prevent any decrease in the output torque and ensure improved precision and safety in the control of opening of the throttle valve.