Motor Unit Yoke Positioning for Stable Liquid Supply Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing configuration of liquid supply devices for vehicles, which uses a brush-equipped motor with a yoke and pump case, faces instability in biasing force and fixing strength, leading to deteriorated motor performance due to inadequate positioning and alignment of components.
Innovation Solution
A motor unit with a cylindrical housing, a disc-shaped bracket, and strategically positioned protrusions and recesses on the yoke and bracket to optimize alignment and positioning, ensuring stable fixing strength and improved motor performance by maximizing the effective magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the yoke and pump case are fitted to each other with simple positioning structures, then the device complexity is reduced, but the fixing strength and biasing force become unstable
Solution Approach 1:
The patent applies local quality by providing multiple positioning protrusions at specific locations on the yoke (first positioning protrusions for bracket engagement, second positioning protrusions for conveying device engagement) rather than a single generic positioning structure. This localized positioning at critical points ensures stable fixing strength while maintaining overall structural simplicity.
Solution Approach 2:
The positioning protrusions and recessed portions are pre-formed on the yoke and bracket during manufacturing, establishing precise positioning relationships before assembly. This preliminary action ensures that when components are assembled, the fixing strength is immediately stable without requiring additional adjustment or complex fastening mechanisms.
2Manufacturing precision
If positioning protrusions are added to the yoke for alignment, then the positioning precision is improved, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the positioning protrusions: they serve both for positioning the yoke relative to the bracket (first positioning protrusions) and for positioning relative to the conveying device (second positioning protrusions). This consolidation achieves high positioning precision without proportionally increasing complexity, as the same structural feature serves multiple alignment purposes.
Solution Approach 2:
The positioning protrusions on the yoke are designed to interact with different components (bracket and conveying device) depending on the operational context. This multi-functionality allows a single structural feature to provide precise positioning in multiple scenarios, reducing the need for separate positioning mechanisms for each interface.
3Ease of manufacture
If the brush is biased toward the commutator with simple spring mechanism, then the ease of manufacture is improved, but the biasing force stability deteriorates
Solution Approach 1:
The patent applies local quality by providing a dedicated brush holding structure with localized biasing force application points on the bracket, rather than relying on a simple spring mechanism alone. This localized structural support at the brush-commutator interface maintains stable biasing force while keeping the overall manufacturing process simple and straightforward.
4Ease of manufacture
If the yoke is formed by bending a single metal plate, then the ease of manufacture is improved, but the positioning stability relative to the bracket deteriorates
Solution Approach 1:
The positioning protrusions are pre-formed on the yoke during the metal plate bending process, establishing precise geometric relationships before assembly. This preliminary formation of positioning features during manufacturing ensures that when the yoke is assembled to the bracket, the positioning stability is inherently built into the structure without requiring post-manufacturing adjustment.
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling the geometry and dimensions of the positioning protrusions and recessed portions during the metal plate forming process. By optimizing these geometric parameters, the yoke achieves both ease of manufacture through single-plate construction and positioning stability through precisely engineered engagement features.
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 optimized positioning and alignment of components in the motor unit stabilize the fixing strength and enhance motor performance, reducing manufacturing costs and increasing manufacturing method variations while maintaining efficient liquid supply.
Implementation Method 1
a motor portion disposed in the housing and disposed coaxially with the bracket, in which the motor portion includes a yoke that is fitted to the inner peripheral surface of the housing and that is formed of a single metal plate bent into a cylindrical shape, and a plurality of permanent magnets disposed on an inner peripheral surface of the yoke
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A motor portion (3) that is the motor unit with which the liquid supply device (1) is provided has an upper case (43) and a yoke (5). The yoke (5) has first positioning projections (35) disposed at substantially equal intervals in the circumferential direction and second positioning projections (36) disposed at substantially equal intervals in the circumferential direction. The first positioning projections (35), the second positioning projections (36), and a first positioning protrusion portion (13) of a housing (2) are disposed at positions not overlapping with each other in any of the circumferential direction, the radial direction, and the axial direction.