Cylinder
AssigneesTpr Co., Ltd., Tpr Industry Co., Ltd.
InventorsTakashi Oizumi, Seiji Tamaki, Kiyoyuki Kawai
Life of this patent
Estimating the term…
Abstract
A cylinder includes grooving in the inner peripheral surface of the cylinder. In the cylinder, the grooving includes a honed groove and recessed grooves of which the groove widths and groove depths are more than those of the honed groove, the honed groove and the recessed grooves extend in the circumferential direction of the cylinder and include an inclination angle with respect to a direction perpendicular to the axis direction of the cylinder, and a length of 4 mm in which four or more of the recessed grooves exist in the axis direction of the cylinder in a region in which an oil ring slides in a case in which a crank angle is 50° or more and 140° or less can be selected on the inner peripheral surface of the cylinder.
Claims10
A cylinder comprising grooving in an inner peripheral surface of the cylinder, wherein
- the grooving comprises a honed groove and recessed grooves of which groove widths and groove depths are more than those of the honed groove,
- the honed groove and the recessed grooves extend in a circumferential direction of the cylinder and comprise an inclination angle with respect to a direction perpendicular to an axis direction of the cylinder, and
- wherein the recessed grooves are formed so that a length of 4 mm in which four or more of the recessed grooves exist in an axis direction of the cylinder in a region in which an oil ring slides in a case in which a crank angle is 50° or more and 140° or less on the inner peripheral surface of the cylinder.
Dependencies are inferred from the claim text.