Motor Pump Vibration Isolation via Brush Holder Spacing
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Solution Overview
Problem
The existing motor pumps in vehicle brake hydraulic pressure control systems experience significant vibration transmission from the motor to the base body due to the brush holder and bearing configuration, leading to increased overall vibration.
Innovation Solution
The motor pump design includes a tubular yoke with a bottom and an opening on the base body side, featuring a bearing fitted inside the base body, a rotation shaft with a rotor and commutator, and a brush holder that engages with the bearing's outer surface, spaced from the base body. A motor-side seal member is used between the yoke and base body to absorb vibration, and a bearing-side seal member is placed between the bearing and base body to prevent fluid leakage and further suppress vibration. The brush holder is integrally fixed to the bearing by insert molding, reducing assembly workload and enhancing attachment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the brush holder is jointed to the base body, then the motor can be driven, but vibration is easily transmitted to the base body
Solution Approach 1:
The patent introduces a vibration-absorbing member as an intermediary component between the brush holder and the base body. This mediator absorbs the vibration generated during motor operation, preventing it from being transmitted to the base body while still allowing the motor to function properly.
Solution Approach 2:
The patent extracts the vibration-absorbing function from the base body structure and implements it as a separate, dedicated vibration-absorbing member. This separation allows the base body to focus on its primary structural function while the specialized member handles vibration absorption.
2Object-affected harmful factors
If the brush holder is spaced from the base body, then vibration transmission is reduced, but the brush holder may be extracted from the yoke
Solution Approach 1:
The base body serves as an intermediary stopper that prevents the brush holder from being extracted from the yoke. By positioning the base body at an appropriate distance, it provides both vibration absorption and mechanical retention functions.
Solution Approach 2:
Instead of using a separate retention mechanism to prevent brush holder extraction, the patent inverts the approach by using the base body's position and the spacing arrangement itself as the retention mechanism. The brush holder is prevented from extraction by the physical presence and positioning of the base body.
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 configuration effectively reduces vibration transmission to the base body, enhancing the motor pump's stability and preventing the brush holder from being extracted, while also reducing the number of parts and manufacturing costs.
Implementation Method 1
The motor-side seal member absorbs vibration, which is caused when the motor is driven
Implementation Method 2
The bearing is fitted to an inside of a bearing hole of the base body. The rotation shaft is pivotally supported by the bearing
Implementation Method 3
The brush holder is fitted to an inside of the yoke and engages with an outer peripheral surface of the bearing
Data Source
AI summary
A motor pump includes a base body, a pump, and a motor. The motor includes a tubular yoke having a bottom and an opening on a base body side, a bearing, a rotation shaft, a rotor, a commutator, a brush and a brush shaft. The bearing is fitted to an inside of a bearing hole of the base body. The brush holder is fitted to an inside of the yoke and engages with an outer peripheral surface of the bearing. The brush holder and the bearing are disposed so as to be spaced from the base body in an axial direction of the rotation shaft. The motor-side seal member is provided between the yoke and the base body. The base body constitutes a stopper that prevents the brush holder from being extracted from the yoke.