Pump Housing Unmachined Motor Mounting Surface
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Solution Overview
Problem
Current methods for producing pump housings for motor vehicle hydraulic units are costly due to the need for machining the outer surface for motor attachment, which increases manufacturing effort and reduces the efficiency of the machining process.
Innovation Solution
A method where the pump housing is clamped against a stop during machining to form openings, eliminating the need for machining the outer surface for motor attachment, allowing the unmachined surface to serve as a reference, thereby reducing manufacturing effort and cost while maintaining precise spatial relationships between pump components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the outer surface for motor attachment is machined using metal-cutting processes, then a precise reference surface is created for mounting the motor and ensuring proper spatial relationships, but the manufacturing effort, cost, and complexity increase
Solution Approach 1:
The pump housing blank itself serves as the reference element by using its own outer surface (which remains unmachined) as the reference surface for positioning during machining. The blank's geometry and the stop's geometry work together to define the precise spatial relationships without requiring additional machining of the reference surface
Solution Approach 2:
Instead of creating a machined reference surface and then positioning components relative to it, the invention inverts the approach by using the unmachined outer surface of the blank as the reference and positioning the machined features relative to it through the stop mechanism
2Reliability
If the outer surface for motor attachment is machined, then a defined interface is created, but the manufacturing cost and time increase
Solution Approach 1:
The unmachined outer surface of the pump housing blank serves as the reference surface for mounting the motor. This self-service approach eliminates the need for additional machining operations on this surface, reducing manufacturing time while maintaining reliable interface definition through the stop-based positioning system
Solution Approach 2:
The stop is designed and positioned in advance to define the precise location where the unmachined outer surface will contact it. This preliminary action ensures that the interface definition is established before any machining occurs, eliminating the need for subsequent machining of the reference surface
3Weight of stationary object
If the pump housing blank is smaller and lighter, then production cost decreases and added value increases, but maintaining precise spatial relationships during machining becomes more difficult
Solution Approach 1:
The pump housing blank serves as its own reference element, with its own geometry and the stop's geometry working together to define precise spatial relationships. This self-service approach maintains manufacturing precision even with smaller, lighter blanks by eliminating the need for heavy, over-engineered reference surfaces
Solution Approach 2:
The invention changes the reference parameter from a machined surface (which requires material removal and adds weight) to the unmachined outer surface of the blank combined with the stop geometry. This parameter change allows for smaller, lighter blanks while maintaining the required spatial relationship precision
Data Source
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AI summary
Disclosed is a pump housing for a hydraulic unit in a motor vehicle, comprising a body that is provided with openings for accommodating components of an associated pump. One of the external surfaces of the body is designed such that a motor can be mounted thereon. According to the invention, no cutting process is used to machine the external surface for mounting the motor.