Brake Pump Guide Ring Structure to Prevent Plunger Scarring
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Solution Overview
Problem
The brake control apparatus disclosed in existing patent literature faces contamination issues between the plunger and the bearing, leading to reduced durability due to scarring of the plunger, which is exacerbated in vehicles with autonomous driving or brake-by-wire systems where the pump is frequently actuated.
Innovation Solution
A brake control apparatus with a guide ring that protrudes into the cam containing hole, featuring a small and large inner-diameter portion, and a flange portion, is used to isolate contamination from the plunger, preventing scarring and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the plunger is actuated frequently, then the pump performance is maintained, but contamination enters between the plunger and bearing causing scarring and reducing durability
Solution Approach 1:
A guide ring is introduced as an intermediary component between the plunger and the cam containing hole. The guide ring has a small inner-diameter portion that contacts the plunger and a large inner-diameter portion that contacts the cam containing hole, serving as a mediator that prevents direct contact between contamination and the plunger while maintaining smooth actuation during frequent pump operations.
Solution Approach 2:
The guide ring is divided into functionally distinct portions: a small inner-diameter portion for plunger contact and a large inner-diameter portion for cam containing hole contact. This segmentation allows each portion to perform its specific function optimally while working together to prevent contamination ingress during frequent actuation cycles.
2Reliability
If the bearing is fixed to protrude into the insertion hole, then the plunger is supported, but contamination accumulates in the gap causing scarring
Solution Approach 1:
The guide ring acts as an intermediary structure that replaces the traditional protruding bearing configuration. By providing a guided surface through its large inner-diameter portion that contacts the cam containing hole, it supports the plunger actuation while preventing contamination accumulation in gaps.
Solution Approach 2:
The guide ring extends in the axial direction with different inner-diameter portions at different positions, creating a dimensional solution that addresses the contamination issue. The small inner-diameter portion is positioned to contact the plunger while the large inner-diameter portion contacts the cam containing hole, effectively changing the spatial arrangement to prevent contamination ingress.
3Reliability
If the gap between cylinder containing hole and plunger is reduced, then sealing is improved, but contamination is more likely to scar the plunger during actuation
Solution Approach 1:
The guide ring serves as a protective intermediary that shields the plunger from contamination during actuation. Its small inner-diameter portion maintains close contact with the plunger for good sealing, while the guide ring itself prevents contamination from reaching and scarring the plunger surface.
Solution Approach 2:
The guide ring provides beforehand protection by preventing contamination from reaching the plunger before scarring can occur. During frequent actuation cycles, the guide ring is positioned to intercept contamination particles, cushioning the plunger against potential scarring damage.
Data Source
AI summary
A guide ring of a pump portion is fixed in a cylinder containing hole in such a manner that a distal end of a first end portion thereof is positioned in a cam containing hole on an upper side with respect to an opening edge of the cylinder containing hole.