Pneumatic Tool Linking Bar Design to Eliminate Deflection and Noise
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Solution Overview
Problem
Conventional pneumatic saws experience deflection and noise due to gaps between the eccentric post and transmission block, leading to inefficient transmission and component wear during fast reciprocating motions.
Innovation Solution
A pneumatic tool design featuring a hollow main body with a driving gear and linking bar, where the linking bar is pivotally connected to both the protruding post and connecting member, eliminating gaps through needle roller bearings at joint points, allowing for smooth and stable reciprocating motion without deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission block is allowed to slide relative to the eccentric post via an elongate slot, then the mechanism can accommodate reciprocating motion, but gaps are formed causing deflection, noise, and component wear
Solution Approach 1:
The connecting member is divided into a head portion and a body portion, with the head portion fitting into the eccentric post and the body portion forming the connecting member. This segmentation allows the head to provide a sliding surface within the elongate slot while the body provides structural support and positioning stability, eliminating deflection and noise issues.
2Reliability
If the transmission block is fixedly assembled to the eccentric post, then positioning stability is improved, but the mechanism cannot accommodate reciprocating motion
Solution Approach 1:
The connecting member is designed with a head portion that can slide within the elongate slot of the eccentric post, allowing dynamic reciprocating motion. Meanwhile, the body portion is fixedly assembled to provide stable positioning. This dynamic design enables both motion capability and positioning stability.
3Ease of operation
If gaps are formed between the eccentric post and transmission block, then reciprocating motion is enabled, but transmission efficiency decreases and noise increases
Solution Approach 1:
The connecting member's head portion is designed with specific dimensional parameters to fit precisely within the elongate slot, minimizing gaps while maintaining reciprocating motion capability. The body portion's dimensions are optimized to provide structural rigidity, reducing energy loss and noise during transmission.
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 design ensures efficient transmission without deflection, reducing component wear and noise, thereby enhancing the pneumatic tool's operational stability and performance.
Implementation Method 1
eliminating gaps through needle roller bearings at joint points
Data Source
AI summary
A pneumatic tool has a hollowed main body. One end of the main body is assembled with a pneumatic motor having a transmission shaft inserted into the main body. The other end of the main body is assembled with a connecting member being slidable along an axial direction of the main body. One end of the connecting member forms a connecting portion, and the other end of the connecting member forms a knife assembling portion. A driving gear is rotatably assembled in the main body and engaged with the transmission shaft. A protruding post is assembled on a portion of the driving gear biasing from an axis of the driving gear. A linking bar has a first end and a second end opposite to the first end. The first end is pin-jointed to the protruding post, and the second end is pin-jointed to the connecting portion of the connecting member.