Engine piston and fatigue testing apparatus for engine piston

Patent metadata

Field	Value
Publication number	US-11761853-B2
Application number	US-202217858816-A
Country	US
Kind code	B2
Filing date	Jul 6, 2022
Priority date	Nov 30, 2021
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

An engine piston is provided. A first sealing structure, including a first sealing rubber ring and a first annular groove, is provided at a head of the engine piston. The first sealing rubber ring has a U-shaped section with a reserved space at the top of the first sealing rubber ring, and a gap for circulating hydraulic oil is provided between a ring bank, above the first sealing rubber ring, of the engine piston and a simulated cylinder liner of a fatigue testing apparatus for an engine piston. In a case that the hydraulic oil is introduced into the fatigue testing apparatus for the engine piston to simulate pressure loading under a high-explosion pressure, when the hydraulic oil enters into the reserved space from the gap for circulating the hydraulic oil, an inner wall of the reserved space is squeezed and the first sealing rubber ring is deformed.

First claim

What is claimed is:

1. An engine piston comprising:
a first sealing structure at a head of the engine piston, and the first sealing structure comprises a first annular groove and a first sealing rubber ring arranged in the first annular groove,
the first sealing rubber ring has a U-shaped section with a reserved space at a top of the first sealing rubber ring,
when hydraulic oil is introduced into a fatigue testing apparatus for the engine piston, the hydraulic oil enters into the reserved space of the first sealing rubber ring from a gap between a ring bank, above the first sealing rubber ring, of the engine piston and a simulated cylinder liner of the fatigue testing apparatus for the engine piston, an inner wall of the reserved space is squeezed, such that the first sealing rubber ring is deformed to form a radial seal.

2. The engine piston according to claim 1 , wherein a second sealing structure is provided at the head of the engine piston, and the second sealing structure comprises a second annular groove arranged below the first annular groove and a retaining ring arranged in the second annular groove.

3. The engine piston according to claim 2 , wherein the first annular groove and the second annular groove are communicated with each other.

4. The engine piston according to claim 2 , wherein the retaining ring is a rubber ring, a Glyd ring or a steel piston ring.

5. The engine piston according to claim 4 , wherein the steel piston ring comprises two semicircles.

6. The engine piston according to claim 1 , wherein the reserved space comprises an inverted trapezoid shape.

7. The engine piston according to claim 1 , wherein a plurality of ring banks is provided at the engine piston in an axial direction.

8. A fatigue testing apparatus for an engine piston, comprising:
a base, a simulated connecting rod, a simulated cylinder liner, a support body, an upper cover plate, a screw plug, a pressure detection device, and the engine piston according to claim 1 , wherein
the upper cover plate and the base are provided at two ends of the simulated cylinder liner respectively, and the support body is sleeved at an outer side of the simulated cylinder liner,
the engine piston is arranged in a cavity defined by the simulated cylinder liner, the head of the engine piston abuts with the upper cover plate, and a bottom of the engine piston is connected to the base through the simulated connecting rod,
a low-pressure oil circuit for introducing the hydraulic oil into the bottom of the engine piston is provided at the base for loading an inertial force, and an outlet of the low-pressure oil circuit is plugged by the screw plug, and
the pressure detection device for detecting a pressure of the hydraulic oil is provided at the upper cover plate.

9. The fatigue testing apparatus for an engine piston according to claim 8 , wherein an oil discharging channel for communicating a gap between the upper cover plate and the support body with the outlet of the low-pressure oil circuit is provided at the support body.

10. The fatigue testing apparatus for an engine piston according to claim 8 , wherein at least one of a first tooling sealing rubber ring is provided between the upper cover plate and the support body,
and, a second tooling sealing rubber ring is provided between the simulated cylinder liner and the upper cover plate.

Assignees

• Weichai Power Co Ltd
• Weichai Heavy Machinery Co Ltd

Inventors

• Liu Haijun
• Wang Ninglu
• Ma Fei
• Liu Baoyu
• Li Lei

Classifications

• G01M13/00 Primary

  Testing of machine parts · CPC title

• G01M15/02 Primary

  Details or accessories of testing apparatus · CPC title

• G01M15/09 Primary

  by monitoring pressure in fluid ducts, e.g. in lubrication or cooling parts · CPC title