Ball Screw Spline Housing Layout for Compact SCARA Assembly
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Solution Overview
Problem
Current ball screw spline installation and maintenance in SCARA robots require disassembly, which is inconvenient and hampers automatic assembly, and the pulley often interferes with bolts, leading to increased size and customization needs.
Innovation Solution
A ball screw spline assembly with a first and second nut, where the shaft passes through both, and a housing with parallel and perpendicular portions, allowing integral installation without disassembly, and a connecting plate to secure the nuts within the housing, preventing pulley interference with bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ball screw spline is installed using conventional methods, then the spline nut can be securely mounted to the housing, but the spline nut must be disassembled from the shaft first, which is inconvenient and hampers automatic assembly
Solution Approach 1:
The housing is divided into two separate portions: a first portion that receives the first nut (spline nut) and a second portion that receives the second nut (ball screw nut). This segmentation allows each nut to be independently mounted to its respective housing portion, eliminating the need to disassemble the spline nut from the shaft during installation.
Solution Approach 2:
A connecting plate is introduced as an intermediary component that couples the second nut to the first portion of the housing. This connecting plate serves as a mediator that establishes the mechanical connection between the two nuts, allowing the ball screw spline to be integrally mounted to the housing without requiring disassembly of the spline nut from the shaft.
2Volume of moving object
If the pulley is positioned close to the bolts on the spline nut, then the assembly size is reduced, but the pulley interferes with the bolts, requiring customization
Solution Approach 1:
The mounting surfaces of both nuts are positioned within the three-dimensional space defined by the first portion, second portion of the housing, and the connecting plate. This spatial arrangement in another dimension allows the pulley to be located close to the bolts without interference, as the bolts are received within the housing portions while the pulley operates in the space created by the connecting plate configuration.
3Reliability
If manual disassembly is required for ball screw spline installation, then secure mounting is achieved, but automatic assembly cannot be implemented, reducing productivity
Solution Approach 1:
The housing is segmented into two portions that can independently receive and secure the respective nuts. This segmentation allows the ball screw spline assembly to be designed with standardized mounting interfaces that can be automatically positioned and fastened by robotic assembly systems, eliminating the need for manual disassembly and reassembly operations.
Solution Approach 2:
The connecting plate serves multiple functions: it couples the second nut to the first portion of the housing, provides a standardized interface for automatic assembly, and maintains the structural integrity of the ball screw spline mounting. This multi-functional design enables universal application in automated assembly processes while ensuring secure mounting.
Data Source
AI summary
A ball screw spline assembly includes a ball screw spline including a first nut including a first mounting surface adapted to receive a first fastening element; a second nut including a second mounting surface adapted to receive a second fastening element; and a shaft passing through the first nut and the second nut; the housing including a first portion and a second portion, the first portion extends in a direction substantially parallel to the shaft, and the second portion extends in a direction substantially perpendicular to the shaft; a connecting plate coupling the second nut to the first portion, the first nut is installed to the second portion; the first mounting surface and the second mounting surface are located within a space defined by the first portion, the second portion and the connecting plate, such that the ball screw spline is integrally installable to the housing.