Piston Pin Puller Adaptor Tool for Short Skirt Piston Extraction

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Solution Overview

Problem

Existing piston pin pullers are not effectively designed for short skirt pistons, leading to potential damage to the piston rings, ring lands, and pin sockets due to uneven contact and rotational moments, and lack versatility to accommodate both full and short skirt pistons.

Innovation Solution

A piston pin puller adaptor tool with interchangeable adaptor sleeves, including a short skirt and full skirt adaptor sleeve, that securely fits the contours of both piston types, minimizing damage and allowing for efficient pin extraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a full circular end-section sleeve is used in the pin puller, then it works well with full skirt pistons where the sleeve abuts the side of the skirt portion, but it does not rest evenly on the side of short skirt pistons and can damage the rings and ring lands

Engineering Contradiction:

Improvecompatibility with full skirt pistonVSAvoiddamage to rings and ring lands

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The puller sleeve is segmented into different end-section configurations (full circular and modified) to match different piston types. The sleeve can be customized or replaced with versions having reduced end-sections that correspond to the actual contact area on short skirt pistons, preventing damage to rings and ring lands while maintaining effective force application.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sleeve end-section is modified to have non-uniform geometry that matches the local contact characteristics of different piston types. For short skirt pistons, the sleeve end is reduced or shaped to contact only the appropriate surface area, concentrating force where needed while avoiding sensitive areas like ring lands.

Inventive Principle:

Principle #3Local quality

2Device complexity

If a full circular end-section sleeve is used on short skirt pistons, then the sleeve is supported only at a portion of its circumference, causing it to pivot and create a rotational moment that can damage the pin and socket

Engineering Contradiction:

Improvesimple sleeve designVSAvoidstraight pin extraction

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The sleeve end-section is made asymmetric or reduced in specific directions to match the actual support geometry on short skirt pistons. This asymmetric design ensures that the sleeve contacts the piston surface in a way that distributes forces evenly and prevents pivoting, creating a stable extraction path without rotational moments.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The problem of insufficient circumferential support is solved by modifying the sleeve geometry in the radial dimension rather than adding complex support structures. By reducing or reshaping the end-section area, the sleeve achieves proper contact distribution across the available piston surface, eliminating pivoting while maintaining structural simplicity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of manufacture

If a single full circular sleeve design is used, then it is simple to manufacture, but it lacks versatility to accommodate both full and short skirt pistons effectively

Engineering Contradiction:

Improvestandardized sleeve productionVSAvoidcompatibility with both piston types

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The puller tool is designed with interchangeable or adjustable sleeve components that can be configured for different piston types. A universal base design incorporates replaceable end-sections or adjustable geometry, allowing the same tool body to accommodate both full skirt and short skirt pistons by swapping or adjusting the sleeve component.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The sleeve design incorporates dynamic or adjustable features that allow it to adapt its geometry based on the piston type being serviced. This could include adjustable end-sections, replaceable tips, or flexible components that conform to different piston geometries, providing versatility while maintaining a relatively simple overall tool structure.

Inventive Principle:

Principle #15Dynamics

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

The tool enables safe and efficient removal of piston pins from both full and short skirt pistons without damaging the rings or ring lands, reducing tool costs and inventory, and ensuring straight pin extraction, thus extending piston reuse and tool applicability.

Implementation Method 1

a puller screw 106, which is configured to draw a piston pin 5 through an adaptor sleeve 108

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS8713777B1Piston pin puller adaptor tool

Publication Date: 2014.05.06 MOTION PRO INC

AI summary

A piston pin puller adaptor tool, which includes a body, a puller screw attached to the body and a number of interchangeable adaptor sleeves, which attach to the body. The interchangeable adaptor sleeves include at least a short skirt adaptor sleeve and a full skirt adaptor sleeve. Also, an adaptor sleeve for use with a pin puller tool, which has been configured to interface with the contours of a short skirt piston.