Pilot Valve Seat Structure for Stable Shock Absorber Pressure Control
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Solution Overview
Problem
Existing damping valves for shock absorbers have unstable structures and pressure control mechanisms, leading to high instability in oil output and damping regulation, which affects the overall performance of the shock absorber.
Innovation Solution
A pilot valve seat with a stable oil discharge structure and improved pressure control is introduced, featuring a pilot valve assembly with a pilot valve spool, pilot valve seat, and pilot spring, along with an adjusting cylinder that moves axially to control the flow rate and pressure in the pilot chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a valve ball with curved surface is used in the pilot valve, then the valve ball can roll in the pilot chamber to adjust pressure, but the contact point between the valve ball, pushrod and spring is not unique, making the system unstable
Solution Approach 1:
The pilot valve is divided into separate functional components: a pilot valve spool for pressure control, a pilot valve seat for sealing, and a valve ball for oil flow control. Each component has a specific function, eliminating the instability caused by the multi-functional curved surface valve ball in the prior art.
Solution Approach 2:
Instead of using a curved surface valve ball that rolls to adjust pressure (prior art), the invention inverts the approach by using a cylindrical pilot valve spool that moves axially within a pilot valve seat. This inversion provides unique contact points and stable positioning while achieving the same pressure control function.
2Ease of operation
If the pilot valve hole is arranged vertically facing the pilot spring, then oil pressure can act on the spring to control the valve ball, but this causes unnecessary force to the spring and makes the valve ball sway
Solution Approach 1:
The invention extracts the pressure control function from the valve ball and assigns it to the pilot valve spool. The valve ball is taken out of the pressure control role and only performs sealing function, eliminating the sway caused by combined pressure and spring forces acting on a single component.
Solution Approach 2:
The pilot valve spool acts as an intermediary between the oil pressure and the valve ball. It receives axial movement control from the electromagnetic valve and translates it into pressure control, while the valve ball remains stable in its sealing position without direct pressure forces causing sway.
3Ease of manufacture
If the valve ball is made unstable through shaking and deviation, then it affects the throttling gap size and sealing effect, but this is the result of the unstable structure rather than a design feature
Solution Approach 1:
The valve components are segmented into distinct functional elements: the pilot valve spool for stable axial movement and pressure control, the pilot valve seat for sealing, and the valve ball purely for flow control. This segmentation ensures each component performs its function reliably without the instability issues of the integrated curved surface design.
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 provides a more stable and efficient pressure control mechanism, reducing uncertain factors and improving the stability of the damping valve, resulting in better damping regulation and smoother vehicle ride.
Implementation Method 1
a pilot spring, configured to be disposed between the pilot valve spool and the pilot valve seat
Implementation Method 2
The adjusting cylinder is configured to move axially with the pilot valve spool to control a flow rate of the oil in the oil inlet chamber
Implementation Method 3
When oil in the main valve chamber enters the pilot chamber, the pressure of the oil acts on the pilot spring
Data Source
AI summary
A pilot valve seat for use in a damping valve in a shock absorber, comprising a pilot valve spool, a pilot valve seat, and a pilot spring disposed between the pilot valve spool and the pilot valve seat; the pilot valve spool and the pilot valve seat are connected with the housing; the pilot valve seat is provided with an oil inlet chamber for guiding the oil in the main valve chamber of the damping valve to the pilot chamber; the oil inlet chamber includes a radial oil inlet hole for oil inlet and a radial oil outlet hole for oil outlet; the pilot valve spool is provided with an adjusting cylinder matched with the oil inlet chamber, and the adjusting cylinder can move axially to control the flow rate of the oil inlet chamber and realize the pressure control in the pilot chamber.