Offset Connecting Rod Vibratory Tamper Bearing Load Reduction
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Solution Overview
Problem
Vibratory tampers in prior art have issues with increased overall weight due to balancing masses, negatively offset center of gravity, and excessive stress on bearings, affecting compaction performance and operator comfort.
Innovation Solution
The connecting rod is offset to bypass the eccentric disk in the direction of advance, minimizing bending moments and loads on bearings, allowing for reduced overall weight and improved ease of use by balancing masses and reducing stress on bearings and drive trains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If balancing masses are arranged in the housing to reduce loads on bearings, then the loads on bearings are reduced, but the overall mass of the vibratory rammer significantly increases
Solution Approach 1:
The invention extracts the balancing function from separate balancing masses in the housing and integrates it into the connecting rod itself. The connecting rod is given an offset that creates counterbalancing effects, eliminating the need for additional balancing masses in the housing and thereby reducing the overall mass while maintaining bearing load reduction
Solution Approach 2:
The invention merges the connecting rod and balancing mass functions into a single component. The offset connecting rod serves both as a mechanical link to transmit force and as a balancing element, combining two previously separate functions into one integrated structure that reduces overall device mass
2Force
If balancing weights are arranged to reduce bearing loads, then bearing loads are reduced, but the center of gravity is arranged negatively to the rear, adversely affecting the overall device
Solution Approach 1:
The invention introduces asymmetry in the connecting rod design with a specific offset that creates an optimal center of gravity position. This asymmetric configuration naturally balances the device without requiring additional weights that would shift the center of gravity to the rear, thereby maintaining both bearing load reduction and proper advance behavior
3Force
If the connecting rod is offset to bypass the eccentric disk, then bending stresses on bearings are minimized, but the device complexity increases
Solution Approach 1:
The invention applies local quality by introducing an offset only in the connecting rod where it is most effective for reducing bending stresses. This localized modification to the connecting rod geometry provides the necessary stress reduction without requiring complex changes throughout the entire device structure
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 results in reduced overall weight, enhanced compaction performance, and improved operator comfort by minimizing bending stresses and balancing masses, leading to a more efficient and user-friendly vibratory tamper.
Implementation Method 1
a bearing in the housing for an eccentric disc which engages with the output shaft, and a bearing for a connecting rod, which is arranged eccentrically on the eccentric disk and transmits the mechanical work of the motor to the substructure
Implementation Method 2
the connecting rod has an offset, which bypasses the eccentric disk against a direction of advance of the vibration tamper, so that the tamping axis is offset back in the direction of the motor
Data Source
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AI summary
The invention relates to a vibratory rammer (1) for compacting subsoil, comprising a superstructure (2) and a substructure (3), wherein the superstructure includes a motor (5) and an eccentric disc (7) driven by it. A connecting rod (8) is eccentrically mounted on the eccentric disc, which converts the rotational movement of the eccentric disc into a linear movement. The substructure has a tamping foot (25) with a tamping plate (13), which is driven by the linear movement of the connecting rod to produce a tamping motion along a tamping axis (9). Due to the crank of the connecting rod, the tamping axis (9) lies in a plane (28) that is parallel to a plane defined by the bearing (18) of the connecting rod on the eccentric disc and in the opposite direction to the forward movement of the vibratory rammer.