Ball Screw Nut Cooling Device Without Dimensional Increase
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Solution Overview
Problem
Existing motion transmission modules with cooling systems either increase the length or outer diameter of the nut, requiring redesign of the nut mounting seat, which affects running accuracy under high axial loads.
Innovation Solution
A motion transmission module with a cooling device that integrates a screw, nut, return member, and rolling elements, featuring a cooling device with a machining-formed or lost wax casting U-shaped passage system that seals cooling liquid circulation without altering the nut's length or diameter, using transverse and longitudinal passages to prevent leakage and maintain accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling system is integrated into the nut by adding end caps and extending the nut length, then the cooling effect is improved, but the nut length increases reducing the travel length of the ball screw
Solution Approach 1:
The cooling circulation system is nested within the existing nut structure by utilizing the hollow space inside the nut body. The cooling passages are formed within the nut's internal volume, allowing the cooling system to be integrated without increasing the external dimensions of the nut. This nesting approach enables the cooling function to be added while maintaining the original nut length and travel length of the ball screw.
Solution Approach 2:
Instead of extending the nut in the axial direction (length dimension), the cooling passages are arranged in the radial and circumferential directions within the nut body. The cooling liquid flows through passages that extend radially from the inner helical groove toward the outer surface, utilizing the radial dimension for heat dissipation without affecting the axial length.
2Temperature
If an outer cover with cooling grooves is added to the nut, then the cooling effect is improved, but the outer diameter of the nut increases requiring redesign of the mounting seat
Solution Approach 1:
The cooling function is extracted from the external structure (outer cover approach) and relocated to the internal structure of the nut. By forming cooling passages within the nut body itself and utilizing the hollow space inside the nut, the cooling system achieves its function without requiring an external cover that would increase the outer diameter. This extraction of the cooling function to the internal volume eliminates the need for redesigning the mounting seat.
3Temperature
If cooling passages are formed in the nut, then the cooling effect is improved, but cooling liquid leakage occurs without proper sealing
Solution Approach 1:
A flexible sealing ring (O-ring) is installed in a sealing groove formed at the position where the cooling passage communicates with the outer surface of the nut. This flexible sealing element prevents cooling liquid leakage at the communication point between the internal cooling passage and the external environment, ensuring reliable sealing while maintaining the cooling function.
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
Effectively cools the nut and return member without increasing the nut's length or diameter, maintaining running accuracy and eliminating the need for redesigning the mounting seat, while preventing leakage through sealed passages.
Implementation Method 1
a cooling circulation system... the transverse passages, the longitudinal passages, the outlet and the inlet are in communication with one another to form a single route... cooling liquid circulation
Data Source
AI summary
A motion transmission module with a cooling device is aimed at solving the disadvantage of the conventional motion transmission module that the cooling structure of the conventional motion transmission module would increase the length or outer diameter of the nut. The nut is formed with a flat surface for mounting the cooling device, so that the length of the nut won't be increased. Furthermore, the cooling device also serves as a positioning block to fix the return member, it doesn't increase the outer diameter of the nut.