Ball Screw Nut Caulking Structure for Pinless Circulation Assembly
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Solution Overview
Problem
The existing ball screw device requires a pin to fix the circulation component, increasing the number of components and limiting the layout due to the need for through holes in the nut main body and circulation component.
Innovation Solution
A nut design with a cylindrical shape that incorporates a housing part with a bow shape on its outer peripheral surface, featuring a seat surface, through holes, and side surfaces, where the circulation component is assembled using arm parts with ribs that are caulked to the side surfaces, eliminating the need for a pin by using a caulking part that hooks into recessed parts, ensuring the component remains attached without falling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pin is used to fix the circulation component, then the circulation component is securely attached to the nut main body, but the number of components increases and the layout is limited due to through holes
Solution Approach 1:
The fixing function is merged into the circulation component itself through the rib structure. The rib extends from the circulation component and engages with the nut main body, eliminating the need for a separate pin component. This integration reduces component count while maintaining secure attachment.
Solution Approach 2:
The pin is extracted/removed from the system entirely. Instead of using a separate pin to connect the circulation component to the nut main body, the design uses the rib structure that is part of the circulation component itself to achieve the same fixing function.
2Reliability
If through holes are created in the nut main body and circulation component for pin insertion, then the circulation component can be fixed, but the layout is limited
Solution Approach 1:
The fixing structure is merged into the circulation component's rib, which engages with a recessed part in the nut main body. This eliminates the need for through holes in both components, allowing more flexible layout arrangements and positioning options for the circulation component on the nut main body.
3Strength
If the circulation component is divided into inner peripheral side component and outer peripheral side component, then the tongue strength is maintained, but the component structure becomes more complex
Solution Approach 1:
The circulation component is segmented into an inner peripheral side component and an outer peripheral side component divided by a division surface. This segmentation allows the tongue to be formed as a single integral piece without weak joints, maintaining its strength while enabling modular manufacturing and assembly of the overall circulation component.
Data Source
AI summary
To provide a nut that can suppress increase in the number of components. The nut according to the present disclosure includes a nut main body and a circulation component. The nut main body includes a housing part having a bow shape when viewed from an axial direction, a seat surface, a through hole, and a pair of side surfaces. The circulation component includes a circulation component main body, two arm parts extending toward both sides in a seat surface direction from the circulation component main body, ribs projecting from the respective two arm parts, and caulking parts obtained by caulking the ribs. Recessed parts that the caulking parts enter are disposed on the pair of side surfaces. A ball passage is disposed in the circulation component main body.