Ball Nut-Damper Coupling Structure for Brake Pump Noise Reduction

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Solution Overview

Problem

Conventional hydraulic supply apparatuses in vehicle brake systems generate vibration and noise due to collisions between the ball nut and the bushing member during axial movement.

Innovation Solution

A coupling structure is introduced where the ball nut features fitting grooves on its outer surface and the damper has corresponding fitting protrusions on its inner surface, minimizing the damper's movement to reduce collisions and noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the ball nut moves axially along the screw during operation, then the hydraulic supply apparatus can function properly, but vibration and noise are generated due to collision with the bushing member

Engineering Contradiction:

Improvefunctional operationVSAvoidvibration and noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The damper is introduced as an intermediary component between the ball nut and the bushing member. It absorbs collision forces and reduces vibrations through its elastic body, preventing direct contact between the ball nut and bushing member while allowing the hydraulic supply apparatus to function properly

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The damper is pre-installed on the ball nut before operation begins. The elastic body is designed to provide cushioning protection in advance, absorbing potential collision forces before they can cause vibration and noise during the axial movement of the ball nut

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Ease of operation

If the damper is loosely coupled to the ball nut, then the ball nut can move freely, but the damper cannot effectively suppress vibration and noise

Engineering Contradiction:

Improvemovement freedomVSAvoidvibration suppression

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The coupling structure is segmented into multiple interaction points between the damper and ball nut. The fitting grooves and fitting protrusions create discrete coupling zones that allow controlled movement while maintaining effective vibration suppression through distributed contact points

Inventive Principle:

Principle #1Segmentation

3Reliability

If a coupling structure with fitting grooves and protrusions is introduced, then the damper's axial movement is minimized and vibration is suppressed, but the device complexity increases

Engineering Contradiction:

Improvevibration suppressionVSAvoidcoupling structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The complex fitting groove and protrusion structure is localized only to the coupling region between the damper and ball nut, while the rest of the components maintain simple geometries. This concentrates the complexity only where needed for vibration suppression without unnecessarily complicating the entire device

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12503094B2Coupling structure of ball nut and damper and hydraulic supply apparatus employing the same

Publication Date: 2025.12.23 HL MANDO CORP

AI summary

In a hydraulic supply apparatus, one or more fitting grooves are formed along the outer circumferential surface of a ball nut, and corresponding fitting protrusions are formed on the inner circumferential surface of a damper coupled to the ball nut. This configuration minimizes damper movement, thereby reducing vibration and noise caused by collision with a bushing member during axial movement of the ball nut.