Linear Motion Guide Ball Retaining Device
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Solution Overview
Problem
Conventional linear motion guide apparatuses fail to securely retain balls or rollers due to loosely attached end locking or engaging parts, which can easily disengage when subjected to force, leading to potential disengagement of the balls or rollers from the slider.
Innovation Solution
A linear motion guide apparatus with a housing featuring an elongated track rail and an endless ball rolling passage, utilizing a ball retaining device with an elongated rod and fastening mechanism to securely engage and retain bearing members, including curved end portions and end caps to form an endless passage, and a fastener system to prevent disengagement by applying tension stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional ball retainers with curved end portions are used to engage with the slider, then the structure is simple and easy to manufacture, but the ball retainers can easily disengage from the slider when balls or rollers are forced against them
Solution Approach 1:
The ball retainer is divided into multiple functional segments: curved end portions for engagement, a body portion with bearing member receiving spaces, and locking portions with holes for securing. This segmentation allows each part to perform its specific function optimally while maintaining overall structural integrity and resistance to disengagement.
Solution Approach 2:
The ball retainers are pre-attached to the slider before the bearing members are installed. The curved end portions are already positioned and secured to the slider, creating a pre-assembled unit that prevents bearing members from disengaging during operation. This preliminary attachment ensures reliability before the system begins operation.
2Device complexity
If bent engaging ends are used on ball retainers to attach to the slider, then the structure remains simple, but the engaging ends can still easily disengage when bearing members are forced against the ball retainers
Solution Approach 1:
The ball retainer structure is segmented into distinct functional zones: bent engaging ends for attachment, body portions with receiving spaces, and locking portions with holes. This segmentation enables the locking portions to provide additional securing points that prevent disengagement while maintaining the simplicity of the bent engaging end design.
Solution Approach 2:
Different parts of the ball retainer have different structural qualities optimized for their specific functions. The bent engaging ends provide flexibility for attachment, while the locking portions with holes provide rigid securing points. This local differentiation of structural properties ensures both ease of installation and reliable retention under load.
Data Source
AI summary
A linear motion guide apparatus includes a housing having a chamber formed by two side walls for slidably receiving an elongated track rail, one or more endless ball rolling passages are formed in the housing for receiving a number of bearing members, one or more ball retaining devices each include an elongated rod for engaging with the bearing members and for retaining the bearing members to the housing, and a fastening device for fastening the ball retaining device to the housing and to prevent the ball retaining device and the bearing members from being disengaged from the housing. A fastener may be used for fastening each of the end portions of the ball retaining device to the housing.