Valve Timing Check Valve With Back Pressure Oil Closure

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional valve timing adjusting devices experience delayed closure of the check valve due to the reliance on urging members, leading to increased time required for passage closure.

Innovation Solution

Incorporation of a check valve part with a back pressure oil passage that allows hydraulic oil to flow into a space opposite to the valve body, urging it toward the valve seat upon backward flow, thereby reducing the time needed for passage closure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a check valve part with urging member is used to close the passage, then the valve can be opened and closed, but the closure time is delayed

Engineering Contradiction:

Improvevalve closure functionVSAvoidpassage closure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The back pressure oil passage is pre-configured to communicate the space opposite the valve seat with the outflow port. When hydraulic oil flows backward, it immediately enters this pre-prepared passage and exerts pressure on the valve body, urging it toward the valve seat for rapid closure. This preliminary arrangement of the oil passage eliminates delays in the closure process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention uses hydraulic oil pressure through the back pressure oil passage to actuate the valve body closure. Instead of relying solely on mechanical urging members, the system employs hydraulic pressure to rapidly push the valve body against the valve seat, significantly reducing closure time while maintaining reliable sealing.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Productivity

If hydraulic oil flows freely from hydraulic chamber to supply source, then oil circulation is maintained, but valve timing control precision is reduced

Engineering Contradiction:

Improveoil circulation efficiencyVSAvoidvalve timing control precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The check valve part acts as an intermediary between the hydraulic chamber and the oil supply source. It allows hydraulic oil to flow in the forward direction (maintaining circulation) while preventing backward flow (maintaining timing precision). The valve body selectively opens or closes the passage based on flow direction, mediating between the need for oil circulation and timing control accuracy.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution significantly shortens the time required for the check valve to close, enhancing the efficiency of the valve timing adjustment process.

Implementation Method 1

a back pressure oil passage that communicates a space opposite to the valve seat with respect to the valve body with the outflow port

Methodology Applied

Scientific EffectHydraulic pressure: Pressure Increase

Implementation Method 2

urging it toward the valve seat upon backward flow

Methodology Applied

Scientific EffectFluid pressure forcing valve closure: Hydraulic Press

Data Source

PatentUS11965438B2Valve timing adjustment device

Publication Date: 2024.04.23 DENSO CORP

AI summary

A check valve part includes: a valve seat hole into which hydraulic oil flows; a valve seat formed around the valve seat hole; a lateral hole formed to have an axis intersecting an axis of the valve seat hole; and a valve body provided so as to be separated from the valve seat or abutted against the valve seat. The valve timing adjustment device further includes a back pressure oil passage that communicates a space opposite to the valve seat with respect to the valve body with the lateral hole.