US 12,092,223 B2
Throttle valve device and method for manufacturing the same
Keina Hitsuyu, Tokoname (JP); and Tohru Shimizu, Tokoname (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Mar. 28, 2023, as Appl. No. 18/191,038.
Claims priority of application No. 2022-094607 (JP), filed on Jun. 10, 2022.
Prior Publication US 2023/0400103 A1, Dec. 14, 2023
Int. Cl. F16K 1/22 (2006.01); F16K 27/02 (2006.01); F16K 31/04 (2006.01)
CPC F16K 1/221 (2013.01) [F16K 27/0218 (2013.01); F16K 31/047 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A throttle valve device comprising:
a body having a passage and a motor space;
a valve arranged in the passage of the body and configured to rotate together with a shaft to open and close the passage;
a motor held in the motor space of the body and configured to operate according to an electric signal and rotate the shaft via rotation of a valve gear such that the shaft is located at a valve fully-closed position at which the valve is fully closed, a valve fully-open position at which the valve is fully open, or a valve intermediate position which is between the valve fully-closed position and the valve fully-open position;
a coil spring arranged around an outer circumference of the shaft in the body and located between the valve gear and the valve, the coil spring having a first spring end extending outward in a radial direction of the coil spring at an end of the coil spring, and a second spring end extending outward in the radial direction at another end of the coil spring, the coil spring being configured to generate a spring force as an opposing force at a time of transmission of rotation from the motor to the shaft;
a first guide having a first through hole through which the shaft extends at a central position of the first guide, a first end surface of the coil spring facing the first guide, the first guide being configured to rotate around the shaft together with the first spring end;
a second guide having a second through hole through which the shaft extends at a central position of the second guide, a second end surface of the coil spring facing the second guide, the second guide being configured to rotate around the shaft together with the second spring end;
a driving portion configured to be rotated together with the valve gear, the driving portion being in contact with the first spring end and the second spring end at the valve intermediate position of the shaft, the driving portion pushing the first spring end or the second spring end against the opposing force of the coil spring during a first movement of the shaft or a second movement of the shaft, the first movement being movement of the shaft from the valve intermediate position to the valve fully-closed position, the second movement being movement of the shaft from the valve intermediate position to the valve fully-open position; and
a holding portion provided in the body, the holding portion being in contact with the first spring end and the second spring end at the valve intermediate position of the shaft, the holding portion holding the first spring end or the second spring end during the first movement or the second movement of the shaft, wherein
the first guide includes a first insertion hole, and the second guide includes a second insertion hole, and
an axis of the first insertion hole in an axial direction of the shaft and an axis of the second insertion hole in the axial direction are located at the same position when both the first spring end and the second spring end are positioned near the valve intermediate position of the shaft and are not in contact with the holding portion.