High Pressure Pump Damper Device Radial Expansion
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Solution Overview
Problem
Existing high pressure pump damper devices face challenges in effectively reducing pressure pulsation due to limited radial expansion of wavy springs and increased component complexity, which affects the uniform load application and damping performance.
Innovation Solution
A high pressure pump design incorporating a damper device with a first-side and second-side support member, a Belleville spring, and a sealed damper chamber formed by joined diaphragms, which are supported between a cover member and a housing to clamp the damper member, allowing for resilient deformation and reduced pressure pulsation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wavy spring is used to support the damper member, then the damper member can be secured in the fluid chamber, but the wavy spring's radial expansion is limited by the inner wall of the fluid chamber, preventing uniform load application and causing torsion of the damper member
Solution Approach 1:
The patent replaces the wavy spring with a flexible circumferential elastic member (bellows structure) that can radially expand without being constrained by the fluid chamber wall. This elastic member is formed by bending a strip-shaped elastic body into a circumferential shape with multiple folds, allowing it to expand and contract radially while supporting the damper member uniformly without causing torsion.
Solution Approach 2:
The patent changes the structural parameters of the support mechanism by transitioning from a linear wavy spring to a circumferential bellows structure. This parameter change enables radial expansion in a different direction (perpendicular to the folds) and allows for greater expansion capability without being limited by the fluid chamber inner wall, thereby achieving uniform load distribution.
2Ease of operation
If the wavy spring is used to secure the damper member, then the damper member can be installed, but the radial expansion of the wavy spring is limited, causing insufficient damping performance
Solution Approach 1:
The circumferential elastic member with bellows structure provides flexible radial expansion capability that is not limited by the fluid chamber dimensions. The multiple folds in the bellows structure allow for significant expansion and contraction while maintaining structural integrity, thereby achieving sufficient damping performance without compromising installation ease.
Solution Approach 2:
The patent transitions from linear spring expansion to circumferential expansion by creating a bellows structure that expands radially outward in a circumferential direction. This dimensional change allows the elastic member to achieve greater expansion capability within the same space, improving damping performance while maintaining compact installation.
3Reliability
If multiple components including wavy spring, washer guide and washer are used to secure the damper member, then the damper member can be firmly installed, but the number of components increases
Solution Approach 1:
The patent merges multiple separate components (support structure, elastic element, and securing mechanism) into an integrated circumferential elastic member. The bellows structure itself serves both as the support element and the securing mechanism, eliminating the need for separate washers, guides, and fasteners, thereby reducing component count while maintaining firm installation.
Solution Approach 2:
The circumferential elastic member performs multiple functions simultaneously: it supports the damper member axially, secures it radially through expansion, provides damping, and maintains sealing. This multi-functional design replaces several specialized components with a single versatile element, reducing overall device complexity.
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 design effectively reduces pressure pulsation by allowing uniform load application and maximizing radial space for fuel flow, improving damping performance while simplifying the structure and reducing component count.
Implementation Method 1
an annular resilient member placed between the cover member and the first-side support member to urge the first-side support member against the first-side outer peripheral portion and to urge the second-side support member against the housing through the damper member
Data Source
AI summary
In a housing, a damper member is placed in a fluid chamber communicated with a pressurizing chamber, at which a plunger is reciprocated to pressurize fuel, and an opening of the fluid chamber is covered with a cover member. The damper member includes first and second-side diaphragms. A first-side support member is located between the damper member and the cover member and is engaged with a first-side outer peripheral portion of the first-side diaphragm and the cover member. A second-side support member is located between the damper member and the housing and is engaged with a second-side outer peripheral portion of the second-side diaphragm and the housing. The first and second-side support members are urged between the housing and the cover member.