Hydraulic Pump Stator Mounting With Thin-Wall Laser Welding
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Solution Overview
Problem
Conventional hydraulic pumps face challenges in securely mounting the stator module within the motor housing without play, requiring complex constructions and laborious assemblies to ensure reliable operation.
Innovation Solution
The hydraulic pump design incorporates a stator module with a support that is received in a retaining portion of the motor housing. The retaining portion has alternating first and second wall portions with different thicknesses, where the second wall portions are thinner and connected to the support via a welded joint, allowing for secure mounting without open access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator module is secured within the motor housing using conventional methods, then reliable operation is ensured, but the construction becomes complex and assembly becomes laborious
Solution Approach 1:
The retaining portion is segmented into different wall portions (first wall portions with greater thickness and second wall portions with lesser thickness) that serve different functions. The second wall portions are specifically designed for welding access, while first wall portions provide structural strength, thereby simplifying the overall mounting construction without compromising reliability
Solution Approach 2:
Different regions of the retaining portion are given different wall thicknesses to perform different functions. The second wall portions have reduced thickness specifically at locations where welding is required, allowing easy material connection while other areas maintain sufficient thickness for structural integrity
2Reliability
If the stator module is secured within the motor housing using conventional methods, then reliable operation is ensured, but the assembly process becomes laborious
Solution Approach 1:
The second wall portions are pre-formed with reduced thickness during the housing manufacturing process, creating predetermined welding access paths. This preliminary preparation eliminates the need for complex assembly procedures, as the welding access features are already integrated into the housing structure
Solution Approach 2:
The invention replaces complex mechanical mounting systems with welding connections through the thin second wall portions. This substitution simplifies the assembly process by eliminating the need for complex mechanical fastening mechanisms, requiring only welding access from the outer surface
3Ease of manufacture
If the wall thickness is reduced for welding access, then easy material connection is achieved, but the structural strength of the housing may be compromised
Solution Approach 1:
The retaining portion features localized thin wall portions (second wall portions) only where welding access is required, while other wall portions (first wall portions) maintain greater thickness for structural strength. This local differentiation allows easy material connection at specific points without compromising the overall structural integrity of the housing
Solution Approach 2:
The housing wall is segmented into functionally different sections: thick first wall portions for structural support and thin second wall portions for welding access. This segmentation allows each section to be optimized for its specific function, ensuring both ease of manufacture and structural strength
4Strength
If conventional housing wall design is used, then structural strength is maintained, but welding access to the stator module is not possible without open access
Solution Approach 1:
Instead of providing open access from the inside to weld the stator module, the invention inverts the approach by creating thin second wall portions that allow welding access from the outside. This reversal eliminates the need for disassembly or open access while maintaining housing strength through the first wall portions
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 design enables the stator module to be securely and reliably mounted within the motor housing with minimal effort, improving the assembly efficiency and reducing the complexity of the hydraulic pump construction.
Implementation Method 1
the second wall portions are formed from a laser-transparent plastic. In particular, the second wall portions are in this case laser-welded to the support
Implementation Method 2
If the welded joint is formed by a laser welding method, the second wall portion is sufficiently thin in the case of such a wall thickness, and therefore a sufficiently large proportion of the laser power passes through the second wall portion
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A hydraulic pump (10) has a motor housing (14) and a stator module (32), which is arranged within the motor housing (14). The stator module (32) has a support (34) which is received in a retaining portion (40) of the motor housing (14). In this case, the retaining portion (40) has first wall portions (42) with a first wall thickness (D) and second wall portions (44) with a second wall thickness (d), wherein the second wall thickness (d) is less than the first wall thickness (D). Here, the second wall portions (44) are connected materially to the support (34) of the stator module (32) by means of a welded joint (54).