Erae Ams Co., Ltd.

Dal Soo Jang

Se Jung Park

Do Hyun Kim

Jong Uk Seo

in a heat treatment method for a tubular shaft for a drive shaft having a ball spline structure for a plunging and an undercut region with a reduced diameter, a carburizing-austempering is performed such that a deep portion hardness of the undercut region is a value between HRC 35 to HRC 50.

Heat treatment method for tubular shaft for drive shaft having ball spline structure and tubular shaft manufactured thereby

A plunging shaft includes: a first shaft having an outer part defining a cylindrical bore and a through hole; a second shaft having an inner part; a ball spline structure connecting the outer part and the inner part so as to transmit rotational power while being relatively movable with respect to each other; and a sealing member that is inserted into the through hole to seal the through hole. The ball spline structure includes: a plurality of outer ball grooves; a plurality of inner ball grooves; a plurality of power transmitting balls; and a ball cage. The outer part is provided with an air discharging groove for discharging air in a space formed by a front end of the second shaft and the cylindrical bore when the first shaft and the second shaft move relatively move to become closer to each other.

Plunging shaft and drive shaft assembly including same

A plunging assembly of a driveshaft includes: an outer housing having a bore having a plurality of outer ball grooves extending in a longitudinal direction; an inner shaft being disposed to be able to undergo relative movement in the longitudinal direction in the bore of the outer housing and having a plurality of inner ball grooves that are paired respectively with the outer ball grooves to form a plurality of ball tracks; a plunging unit connecting the outer housing and the inner shaft to allow a plunging motion and a rotational power transmission between the outer housing and the inner shaft; and a stopper that is provided in the bore of the outer housing to limit relative movement of the inner housing and the inner shaft in a direction in which the inner shaft is inserted into the bore. The outer housing has a mounting hole communicating with the bore, and the stopper is a plug member that is inserted into the mounting hole in a state that a frontal end portion thereof is exposed to the bore.

Plunging assembly for driveshaft

Seal for drive shaft of a vehicle

A tripod constant-velocity joint includes: an outer joint member having a cavity elongated in a longitudinal direction and three roller tracks; an inner joint member having a center body and three journals outwardly radially protruded from the center body; and three roller assemblies respectively coupled to the journal in a state of being respectively disposed in the roller tracks. The respective roller assembly comprises: an inner race which is connected to the journal and is provided with a first inner ball groove and a second inner ball groove on both lateral sides thereof; a first ball array and a second ball array respectively having a plurality of balls which are respectively disposed in the first inner ball groove and in the second inner ball groove; and a ball cage which restricts movements of the first ball array and the second ball array in a longitudinal direction thereof.

Growing community of inventors

Daegu, South Korea

Dal Soo Jang