Miniature Linear Motion Guide Unit Roller Alignment

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Solution Overview

Problem

Miniature linear motion guide units face challenges in ensuring smooth and steady rolling of small rollers without obstacles across boundaries in the circulating circuit, particularly due to alignment issues and potential gaps between components, which can lead to roller leaning and interference.

Innovation Solution

A linear motion guide unit design featuring a retainer plate that extends along the load-carrying race and end caps with spigots, where the retainer plate and end cap extremities are beveled or stepped to ensure gap-free contact, and a binding strip secures the retainer plate to the carriage, guiding rollers through the circuit without tilting or falling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If miniature rollers are used in the linear motion guide unit, then the device size is reduced and it can carry heavy loads, but the rollers may encounter obstacles and alignment issues when rolling across boundaries in the circulating circuit

Engineering Contradiction:

Improvedevice sizeVSAvoidsmooth rolling of rollers

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The retainer plate is pre-configured with guide surfaces at its ends that extend into the turnaround passages before the rollers reach them. This preliminary guidance structure ensures that miniature rollers are smoothly directed from the load-carrying race through the turnaround passages and into the return passage without encountering alignment issues or obstacles at the boundaries

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The retainer plate acts as an intermediary component between the load-carrying race and the turnaround passages. Its guide surfaces mediate the transition of rollers across boundaries, providing continuous geometric guidance that eliminates gaps and misalignment between different circuit sections, thereby ensuring reliable smooth rolling of miniature rollers

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If the retainer plate and end cap are butted together with a gap, then the assembly is easier to manufacture, but rollers may fall into the gap or get caught, causing interference

Engineering Contradiction:

Improveassembly easeVSAvoidroller interference

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The invention changes the geometric parameters of the retainer plate ends by providing guide surfaces that extend into the turnaround passages. This parameter modification eliminates gaps between the retainer plate and end cap, preventing rollers from falling into or getting caught in gaps, thereby eliminating roller interference while maintaining ease of manufacture through the integrated guide surface design

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional retainer means are used to hold rollers, then the structure is simpler, but alignment issues occur at boundaries causing rollers to lean or fall

Engineering Contradiction:

Improveretainer structureVSAvoidroller alignment

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The retainer plate is pre-configured with guide surfaces at its ends that extend into the turnaround passages before rollers reach them. This preliminary guidance structure ensures that miniature rollers are smoothly directed from the load-carrying race through the turnaround passages and into the return passage without encountering alignment issues or obstacles at the boundaries

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design ensures smooth and orderly travel of miniature rollers by eliminating gaps and misalignment, maintaining roller alignment and preventing interference, thus enhancing the reliability and longevity of the linear motion guide unit.

Implementation Method 1

the retainer plate and end cap extremities are beveled or stepped to ensure gap-free contact, and a binding strip secures the retainer plate to the carriage, guiding rollers through the circuit without tilting or falling

Methodology Applied

Scientific EffectMechanical constraint and guidance:

Data Source

PatentUS7832930B2Linear motion guide unit

Publication Date: 2010.11.16 NIPPON THOMPSON

AI summary

An interlocking construction between an end cap and a retainer plate to support rollers in a load-carrying race is made to provide an endless circulating circuit with no gap to allow the rollers smoothly rolling through there with keeping adequate posture. The slider has a carriage, end caps, rollers rolling through a circulating circuit, a retainer plate extending along the load-carrying race to keep the rollers inside the load-carrying race, and a binding strip to fasten the retainer plate to the carriage. The retainer plate comes into connection with spigots extending out of the end caps. Lengthwise opposite ends of the retainer plate conform to ends of the spigots in a complementary relation to fit over the ends of the spigots in a sliding direction.