Rammer Crank Shaft Orthogonal Support and Dual Reduction
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Solution Overview
Problem
Conventional rammers experience unstable forward movement due to right-left body vibration, reduced pinion gear strength and abrasion resistance, direct vibration transmission to the engine, and crank shaft flexing, leading to impact on gear mesh parts.
Innovation Solution
A rammer design with a crank shaft axis orthogonal to the travel direction, a two-step reduction mechanism using a belt and gear reduction system, and an engine mounted on a flexible plate member to absorb impact, ensuring stable forward movement and enhanced pinion gear strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the crank shaft has a cantilever support structure where only one end is rotatably supported, then the structure is simple, but the crank shaft tends to be flexed and impact is forced on the mesh part between the pinion gear and crank gear
Solution Approach 1:
The crank shaft support structure is segmented into two separate support points: one support at one end and another support at the other end. This divides the single cantilever support into multiple support segments, allowing the crank shaft to be supported at both ends without increasing overall structural complexity
Solution Approach 2:
A support structure acts as an intermediary element between the crank shaft and the external environment. By introducing this intermediate support at one end of the crank shaft, the system distributes the load and prevents direct impact forces from being transmitted to the gear mesh, thereby protecting the mesh part between pinion gear and crank gear
2Device complexity
If one-step reduction is used by using the pinion gear and crank gear engaged with each other, then the structure is simple, but the number of teeth is reduced, making it difficult to ensure strength and abrasion resistance of the pinion gear
Solution Approach 1:
The single-step reduction mechanism is segmented into two separate reduction stages: first the pinion gear engages with the crank gear for initial reduction, then the chain mechanism provides a second reduction stage. This segmentation allows the pinion gear to have sufficient teeth for strength while achieving the required total reduction ratio through the combined two-stage system
Solution Approach 2:
The reduction mechanism transitions from a single-dimensional (one-step) approach to a two-dimensional (two-step) approach by adding the chain mechanism as a second reduction stage. This dimensional expansion in the reduction process allows the pinion gear to maintain adequate tooth count for strength and abrasion resistance while still achieving the necessary overall reduction ratio
3Stability of the object's composition
If the engine is rigidly fixed on the case in the reciprocating mechanism, then the structure is stable, but vibration is directly transmitted to the engine during compaction work
Solution Approach 1:
The rigid fixed mounting structure is replaced with a flexible rubber mounting structure. This flexible material acts as a vibration isolator, allowing the engine to remain securely mounted while absorbing and damping the vibrations generated during compaction work, thereby preventing direct transmission of harmful vibrations to the engine
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 reduces right-left vibration, improves stability through gyro effect, enhances pinion gear strength and abrasion resistance, and protects the engine from impact forces during compaction work.
Implementation Method 1
the gyro effect allows the rammer to stably jump forward
Implementation Method 2
A two-step reduction mechanism of the present invention reduces a rotation speed by using the belt reduction mechanism alone
Implementation Method 3
the plate member is flexed to reduce the impact force and the reduced impact force is transmitted to the engine
Data Source
AI summary
A rammer includes: an engine; a reciprocating mechanism (3) including a crank shaft (13) and a connecting rod (14), and configure to convert a rotational force of the engine into a reciprocatory force; a leg part disposed in a forward inclined position in a traveling direction and configure to be moved up and down by the connecting rod (14); and a compacting plate disposed on a bottom end of the leg part. The crank shaft (13) is disposed orthogonally to the traveling direction. The reciprocating mechanism (3) includes a belt reduction mechanism (16) and a gear reduction mechanism (17).