Patent DE-3476357-D1 (DE)
Title: Vehicle wheel
Inventor: FRICK EWALD DIPL ING
IPC: B60B7/04
Filed: 1984-12-11
Granted: 1989-03-02
Abstract: 1. Motor vehicle wheel having a spoke disc and a wheel cap with the following known features : a) the spoke disc has a somewhat dish-shaped configuration and is produced from light metal, in its centre a central bore is opened which is oriented coaxially with an axis of rotation, several through-passing bores for the passage of threaded bolts for the securing of the spoke disc to a motor vehicle axle are provided on a circle of holes which is coaxial with the axis of rotation, with the inner side of the spoke disc facing the vehicle axle in the assembled condition, in the spoke disc a securing bore is arranged coaxially with the axis of rotation and accessibly from the exterior, the diameter of which bore is greater than 5 cm. And in the inner wall of which bore retaining flanks are formed which are oriented at a wedge angle in relation to the axis of rotation ; b) a wheel cap which covers at least the central zone with the through-passing bores is fittable on the outside of the spoke disc ; c) the wheel cap consists of a cover disc with a central bore and a securing part passing through this bore ; d) the securing part is fixable with its shank in the securing bore of the spoke disc and applicable with its head externally against the cover disc in order to hold the latter fast on the spoke disc ; e) the securing bore (19) has a coaxial annular face (23) which extends somewhat radially and points towards the inner side of the spoke disc (11) ; f) the securing part (28) consists of an inner shank (38) connected fast in rotation with the head (34) and penetrating the central bore (33) of the cover disc (27) and an outer shank (39) mounted limitedly rotatably and axially arrestably thereon, which outer shank is internally applicable to the cover disc (27) with the end zone (46) facing the head (34) ; g) the end region of the outer shank (39), which is insertable into the securing bore (39), has at least three radially resilient tongues (47) distributed on the circumference, in the exterior of which there are formed coaxial annular surface segments (51) corresponding to the annular surface (23) in the securing bore, having a radially protruding course and pointing towards the cover disc (27), while radially inwardly directed cam tracks (52) are formed on the inside of the tongues (47) ; h) the inner shank (38) has in the end region a number, corresponding  to the number of the resilient tongues (47), of radially outwardly protruding cams (41) which are bringable into and out of engagement with the cam trachs (52) of the tongues (47) in a relative rotation of inner shank (38) and outer shank (39) ; i) in the connected condition the cams (41) of the inner shank (38) lie against the pertinent cam tracks (52) of the outer shank (39), while the annular surface segments (51) of the resilient tongues (47) grasp in hook manner over the oppositely directed annular surface (23) in the securing bore (19) of the spoke disc (11) and regions of the tongues are pressed with frictional engagement on regions of the securing bore.