Patent ID: 9234479
Filing Date: 2016-01-12
CPC Classification: F02F,F16J

Claim Text:
1. An oil scraper ring comprising a holding ring, a clamping element, and a scraper having a scraper lip, wherein the scraper is arranged in the holding ring such that the scraper lip is oriented towards a center of the oil scraper ring in order to scrape oil at a piston rod, wherein the scraper is composed of a plurality of scraper segments which abut one another in a circumferential direction of the oil scraper ring, thereby forming a scraper segment butt-joint between consecutive scraper segments; wherein the holding ring has two end faces, a first end face and a second end face oriented towards the center of the oil scraper ring, the first end face and the second end face being mutually separated by a groove running in the circumferential direction; wherein the groove is for form-fitted reception of the scraper segments; wherein the holding ring and the scraper extend in an axial direction; wherein the holding ring in the axial direction ends on each side at a side face extending radial to the axial direction, so that the side faces extend in parallel to each other, wherein the scraper segments are arranged in the holding ring such that the scraper segments do not protrude from the side faces in the axial direction; wherein the holding ring is composed of a plurality of holding ring segments which abut one another in the circumferential direction, thereby forming a holding ring segment butt-joint between consecutive holding ring segments; wherein the holding ring is made of plastic, wherein at least the first end face of the holding ring is adapted to contact the piston rod, wherein the first end face extends in axial direction forming one continuous surface that contacts the piston rod; wherein the holding ring has an outer surface, oriented opposite to the center of the oil scraper ring; wherein the clamping element encloses the holding ring from the outer surface to bring a bias acting against the center onto the holding ring and the first end face, to hold the holding ring in an defined position; wherein the scraper is composed of a material having a larger hardness than the plastic forming the first end face; wherein the scraper lip of the scraper has a contact position oriented towards the center; wherein the scraper and the holding ring are configured mutually adapted such that both of the at least one end face and the contact position are configured to simultaneously contact the piston rod; wherein the holding ring segment butt-joints at the at least one end face and the scraper segment butt-joints at the contact position are arranged spaced apart in axial direction and are arranged spaced apart from each other in circumferential direction so that the at least one end face and the contact position seal the piston rod against leakage in axial direction; and wherein the holding ring has at least one passage running radially with respect to the center, forming a passage between the second end face and the outer surface.