US 11,721,466 B2
Inner plunger of solenoid assembly for differential clutch of vehicle and manufacturing method thereof
Byoung Sun Choi, Daegu (KR)
Filed by Byoung Sun Choi, Daegu (KR)
Filed on Feb. 22, 2021, as Appl. No. 17/181,478.
Prior Publication US 2022/0270801 A1, Aug. 25, 2022
Int. Cl. H01F 7/16 (2006.01); F16H 48/34 (2012.01); F16H 48/24 (2006.01); H01F 7/08 (2006.01); F16D 27/118 (2006.01)
CPC H01F 7/1607 (2013.01) [F16H 48/24 (2013.01); F16H 48/34 (2013.01); H01F 7/081 (2013.01); F16D 27/118 (2013.01)] 2 Claims
OG exemplary drawing
 
1. An inner plunger of a solenoid assembly for a differential clutch of a vehicle, the inner plunger comprising an inner ring injection-molded of insulator synthetic resin with moldability and an outer ring formed on an outer circumferential surface of the inner ring,
wherein the outer ring formed of metal includes three or more retaining grooves, each of which an entrance is narrow and an inside gets wider, and the three or more retaining grooves are filled with synthetic resin of the inner ring by injection so as to be firmly combined with the inner ring made of the insulator synthetic resin, and
wherein upper and lower ends of the outer ring are supported by a retaining jaw for supporting the upper end of the outer ring and a support piece for supporting the lower end of the outer ring, and an under cut groove is formed between upper and lower support parts on an inner surface of the inner ring made of the synthetic resin in order to reduce friction against an inner housing.