Oil control ring

Patent metadata

Field	Value
Publication number	US-2024141993-A1
Application number	US-202218548166-A
Country	US
Kind code	A1
Filing date	Mar 8, 2022
Priority date	Mar 31, 2021
Publication date	May 2, 2024
Grant date	—

Abstract

An oil control ring comprises: an oil ring having a pair of land parts arranged in a sliding direction and connected to each other by a web part; and a coil expander that biases the oil ring toward the outer circumferential side in the radial direction. The web part of the oil ring is provided with a plurality of window holes. In the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, a width H 1 in the sliding direction of the oil ring and a length L 1 of a combustion chamber-side non-window hole part, which excludes the window hole, in the outer circumferential surface of the web part, satisfy the condition of 0.15>L 1/ H 1 ≥ 0.

First claim

1 . An oil control ring, comprising:
an oil ring having a pair of land parts arranged in a sliding direction and connected to each other by a web part; and a coil expander arranged on an inner circumferential side of the oil ring in a radial direction, the coil expander biasing the oil ring toward an outer circumferential side in the radial direction, wherein the web part of the oil ring is provided with a plurality of window holes along a circumferential direction, the window holes each extending through the web part in the radial direction; wherein, in an axial cross-sectional view of a largest opening portion in an axial direction of the window hole in the oil ring, an inner surface of a combustion chamber-side land part which is located on the outer circumferential side in the radial direction of the combustion chamber-side land part and connects an outer circumferential surface in the radial direction of the web part and a sliding surface of the land part, and an inner surface of a crank case-side land part which is located on the outer circumferential side in the radial direction of the crank case-side land part and connects the outer circumferential surface in the radial direction of the web part and a sliding surface of the land part, are formed so as to increase a diameter toward the outer circumferential side in the radial direction, and wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, a width H 1 in the sliding direction of the oil ring and a length L 1 of a combustion chamber-side non-window hole part, which excludes the window hole, in the outer circumferential surface of the web part, satisfy the following condition:
0.15> L 1/ H 1≥0.

2 . The oil control ring according to claim 1 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, when a crank case-side end of the sliding surface of the combustion chamber-side land part is referred to as point A, a window hole-side end of the combustion chamber-side non-window hole part in the outer circumferential surface of the web part is referred to as point B, and an end of the combustion chamber-side non-window hole part, which is located on a side of the inner surface of the land part, in the outer circumference surface of the web part is referred to as point C, a distance AB between the points A and B, a distance AC between the points A and C, and a distance BC between the points B and C, satisfy the following condition: 1.0≥(distance AC+distance BC)/(distance AB)≤1.5.

3 . The oil control ring according to claim 2 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, an area of a triangle formed by the points A, B and C is 11% or less and 0% or more of an area of a space formed by the pair of land parts and the web part on the outer circumferential side in the radial direction of the oil ring.

4 . The oil control ring according to claim 2 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, when a combustion chamber-side end of the sliding surface of the crank case-side land part is referred to as point A′, (distance AC+distance BC)/(distance AB), the length L 1 (mm) of the non-window hole part, and a distance L 4 (mm) between the points A and A′ of the land parts satisfy the following condition:
0.6(mm 2 )> L 1×((distance AC+ distance BC )/(distance AB ))× L 4.

5 . The oil control ring according to claim 1 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, a width L 2 in the sliding direction of the web part and the length L 1 of the non-window hole part satisfy the following condition:
0.27≥ L 1/ L 2.

6 . The oil control ring according to claim 1 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, a width L 2 in the sliding direction of the web part and a width L 3 in the sliding direction of the window hole satisfy the following condition:
L 3/ L 2≥0.46.

7 . The oil control ring according to claim 1 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, an angle formed by a virtual line passing a crank case-side end of the sliding surface of the combustion chamber-side land part and the window hole-side end of the combustion chamber-side non-window hole part in the outer circumferential surface of the web part, with respect to the radial direction of the oil ring, is 33 degrees or less.

8 . The oil control ring according to claim 1 , wherein the non-window hole part is a flat surface or a curved surface.

9 . The oil control ring according to claim 1 , wherein, in the axial cross-sectional view of the largest opening portion of the window hole in the axial direction of the oil ring, the non-window hole part does not exist, and the inner surface of the combustion chamber-side land part is directly connected to a combustion chamber-side opening end of the window hole.

Assignees

• Tpr Co Ltd

Inventors

• Hikone Akira
• Oguro Takashi
• Ayuzawa Noriaki
• Yamaoka Toshihiro
• Umeda Naoki

Classifications

• F16J9/20 Primary

  Rings with special cross-section (L-section rings F16J9/02); Oil-scraping rings {(F16J9/06 takes precedence)} · CPC title

• F16J9/062 Primary

  Coiled spring along the entire circumference · CPC title