Piston having oil return passage
AssigneesMahle International GmbH, Mahle Automotive Technologies (China) Co., Ltd.
InventorsShaobo Zeng, Jianjun Zhu
Life of this patent
Estimating the term…
Abstract
A piston with an oil return channel may include a piston head, a piston skirt, and an oil return hole. The piston head may include a ring groove. The piston skirt may be connected to the piston head. The piston skirt may have a surface including a concave face window. A connection between the face window and the ring groove may form a residual ring bank. The oil return hole may be formed by milling on the residual ring bank. The oil return hole may connect the ring groove close to the piston skirt with the face window. A depth of the oil return hole may be greater than a depth of the ring groove.
Claims20
A piston having an oil return passage, comprising:
- a piston head including a ring groove;
- a piston skirt connected to the piston head, the piston skirt having a surface including a concave face window, a remaining ring land formed at a connection between the face window and the ring groove;
- and
- an oil return hole disposed in the remaining ring land and formed by milling the remaining ring land;
- wherein the oil return hole connects the ring groove close to the piston skirt with the face window;
- and
- wherein a depth of the oil return hole is greater than a depth of the ring groove.
A piston with an oil return channel, comprising:
- a piston head including a plurality of ring grooves;
- a piston skirt connected to the piston head, the piston skirt having a surface including a concave face window;
- a remaining ring land arranged between the face window and a ring groove of the plurality of ring grooves disposed closest to the piston skirt;
- and
- at least one oil return hole disposed in the remaining ring land and fluidically connecting the ring groove and the face window;
- wherein a depth of the at least one oil return hole is greater than a depth of the ring groove.
Dependencies are inferred from the claim text.