Stator Snap-Fixing for Vibration and Thermal Expansion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cooling circuit pumps for motor vehicles face challenges in securely fastening the stator under vibration loads while accommodating temperature-related dimensional tolerances.
Innovation Solution
The stator is fastened to the motor housing using a snap hook device with radially distributed snap-in hooks that engage with latching lugs, supported by a one-piece injection-molded motor housing and support ring, incorporating a tolerance compensation element for thermal expansion and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stator is fastened by screw or adhesive connections, then the stator is securely fixed under vibration loads, but the temperature-related dimensional tolerances cannot be compensated
Solution Approach 1:
The fixation system is divided into multiple snap hooks distributed around the circumference, each independently engaging with the stator. This segmentation allows localized adjustment and compensation for thermal expansion while maintaining overall fixation security.
Solution Approach 2:
The snap hooks are designed with elastic deformation capability, allowing them to change their engagement parameters (position, force) in response to temperature-induced dimensional changes in the stator, thereby maintaining secure fixation across temperature variations.
2Device complexity
If the stator is fastened by screw or adhesive connections, then the structure is simple, but the assembly is difficult and temperature tolerances cannot be accommodated
Solution Approach 1:
The snap hooks are pre-formed with latching lugs positioned to automatically engage with corresponding features on the stator during assembly. This preliminary positioning eliminates the need for complex alignment procedures required by screw connections, significantly easing assembly while maintaining structural simplicity.
Solution Approach 2:
The traditional mechanical screw or adhesive fastening system is replaced with a snap-fit mechanical interlocking system using latching lugs. This substitution maintains structural simplicity while dramatically improving assembly ease through tool-free installation.
3Adaptability or versatility
If snap hooks are used to fasten the stator, then temperature tolerances can be compensated and assembly is easy, but the fixation security under vibration loads may be insufficient
Solution Approach 1:
The snap hooks integrate multiple functions into a single component: they provide the latching action for easy assembly, incorporate elastic elements for temperature compensation, and maintain continuous contact pressure for vibration resistance. This merging of functions resolves the apparent contradiction between ease of assembly and fixation security.
Solution Approach 2:
The snap hooks feature curved engagement surfaces and elastic deformation zones that allow them to conform to thermal expansion while maintaining secure contact. The curved geometry provides mechanical advantage for resisting vibration loads while accommodating dimensional changes.
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 solution provides secure fixation against vibrations and compensates for temperature-induced dimensional changes, ensuring reliable operation and easy assembly, enhancing the durability and performance of the cooling circuit pump.
Implementation Method 1
a tolerance compensation element (22) is arranged between the support ring (18) and the laminated core (11, 12, 13, 14, 15) which, as mentioned at the outset, ensures that temperature-related expansions can be absorbed
Implementation Method 2
snap-in hooks (16) are arranged on the inside of the laminated core (11, 12, 13, 14, 15) distributed radially around the circumference of the motor housing (14) and grip the laminated core (11, 12, 13, 14, 15) in a form-fitting manner with the aid of latching lugs (20) formed at their ends
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a cooling circuit pump for a motor vehicle, having a stator which is arranged in a motor housing (14) and in which a rotatably mounted rotor is received. It is proposed that the stator (12) is received in the motor housing (14) in a positively locking manner.