Reciprocating Work Machine Handle Vibration Reduction
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Solution Overview
Problem
The existing reciprocating work machines are not capable of sufficiently reducing vibration transmitted from the housing to the handle, which affects the workability.
Innovation Solution
A reciprocating work machine design that includes a metal weight with a base portion and arm portions extending in the axial direction, along with a metal spring supported by the housing and handle, where the weight and spring are arranged to reduce vibration by altering the natural frequency and using frictional resistance to suppress kinetic energy transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If elastic means are provided between the housing and the handle to reduce vibration, then vibration transmission is reduced, but the vibration reduction effect is insufficient
Solution Approach 1:
A weight member with a mass of 50g to 200g is attached to the handle to generate inertia force that counteracts the vibration force transmitted from the housing. The weight member functions as a counterweight that produces opposing inertial forces to reduce the net vibration transmitted to the user's hand.
Solution Approach 2:
The spring member and weight member form a vibration reduction mechanism that utilizes controlled mechanical vibration and elastic deformation. The spring absorbs and dissipates vibration energy through elastic cycling, while the weight member's inertia creates counter-vibrations that interfere with and reduce the transmitted vibration.
2Object-affected harmful factors
If a weight member is added to the handle to reduce vibration, then vibration reduction is improved, but the device complexity increases
Solution Approach 1:
The weight member is integrated with the handle structure, and the spring member connects the weight member to the housing, forming a combined vibration reduction system. This merging of components achieves vibration reduction without requiring completely separate subsystems, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If the spring constant of the elastic body is increased to reduce vibration, then vibration reduction is improved, but the ease of operation deteriorates
Solution Approach 1:
The spring constant is optimized to a specific range (0.5 N/mm to 2.0 N/mm) to balance vibration reduction performance with operational ease. This parameter optimization ensures the spring is stiff enough to reduce vibration effectively but compliant enough to allow smooth handle operation and reciprocating motion.
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 effectively reduces handle vibration, improving workability and maintaining a compact size without the need for additional space.
Implementation Method 1
a spring provided between the housing and the handle and expanding and contracting in a reciprocating direction of the striking mechanism when the handle is operated relative to the housing
Implementation Method 2
a weight provided to the handle and made of a material having a density higher than each of a density of a material constituting the handle and a density of a material constituting the housing
Implementation Method 3
using frictional resistance to suppress kinetic energy transmission
Data Source
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AI summary
Provided is a reciprocating work machine capable of further reducing vibration transmitted from a housing to a handle. The reciprocating work machine 10 provided with an electric motor, a piston and a striker reciprocating by power of the electric motor and striking a tool, and a housing 12 accommodating the electric motor, the piston, and the striker, includes: a resin handle 50 operably connected to the housing 12; a spring 74 provided between the housing 12 and the handle 50 and expanding and contracting in a reciprocating direction of the piston and the striker when the handle 50 operates relative to the housing 12; and a weight 61 provided to the handle 50 and made of a material having a specific gravity higher than each of a specific gravity of a material constituting the handle 50 and a specific gravity of a material constituting the housing 12.