Hydraulic Oil Control Valve Sleeve Layout for Low Pressure Loss
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Solution Overview
Problem
Existing hydraulic valve timing adjusting devices face challenges in reducing deformation of the outer sleeve during assembly and pressure loss of hydraulic oil due to the design of the sliding portion between the spool and inner sleeve.
Innovation Solution
The hydraulic oil control valve design includes a cylindrical outer and inner sleeve with a spool that slides along the inner sleeve, featuring a reduced distance between ports and an enlarged diameter portion to minimize deformation and pressure loss, with the sliding portion placed between the projection and opening, and a spool configuration that reduces pressure loss by optimizing the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sliding portion is designed in the conventional configuration, then the assembly is straightforward, but deformation of the outer sleeve occurs during assembly and pressure loss of hydraulic oil increases
Solution Approach 1:
The patent applies local quality by providing a projection on the outer sleeve at a specific location where the sliding portion is positioned. This localized structural feature reinforces the outer sleeve precisely where needed to prevent deformation during assembly, without requiring changes to the entire sleeve structure. The projection creates a stable support point that maintains the outer sleeve's shape integrity while allowing the sliding portion to function properly.
2Ease of manufacture
If the sliding portion is designed in the conventional configuration, then the assembly is straightforward, but pressure loss of hydraulic oil increases
Solution Approach 1:
The patent addresses pressure loss by locally modifying the structure at the sliding portion area. The projection on the outer sleeve and the corresponding recess on the inner sleeve create a precisely fitted interface that minimizes clearance gaps. This localized precision fitting reduces turbulent flow and pressure loss of hydraulic oil passing through the sliding portion, while maintaining the overall simplicity of the assembly process.
3Ease of operation
If the spool is positioned at the end portion opposite to the camshaft, then the actuator placement is optimized, but the sliding portion design becomes critical for preventing deformation
Solution Approach 1:
The patent strategically places the projection on the outer sleeve and the recess on the inner sleeve to provide localized reinforcement at the sliding portion. This local structural enhancement prevents deformation of the outer sleeve caused by the positioning of the spool and actuator, while maintaining the optimized actuator placement for ease of operation. The localized feature does not interfere with the actuator's function and may even support the spool's movement.
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
This design reduces deformation of the outer sleeve and minimizes hydraulic oil pressure loss, ensuring efficient operation and cost-effectiveness by optimizing the flow path and material usage.
Implementation Method 1
control a hydraulic oil pressure of hydraulic oil to be supplied to a valve timing adjusting device
Implementation Method 2
the spool is configured to be slid along the inner sleeve when the spool is driven by an actuator
Data Source
AI summary
A hydraulic oil control valve includes an outer sleeve, an inner sleeve and a spool. The outer sleeve includes: a threaded portion, which is fixed to a camshaft; a projection, which is fixed to a phase changer; and ports, which are formed at a peripheral surface of the outer sleeve between the threaded portion and the projection. The inner sleeve includes: ports, which are communicated with the ports of the outer sleeve; an oil port; an axial groove; and an enlarged diameter portion, which is located on one side of the projection where an insertion opening of the outer sleeve is placed. The spool includes: land portions, which are configured to slide along an inner peripheral surface of the inner sleeve and are located at an outer periphery of the spool at a location that is on another side of the projection where the threaded portion is placed.