Dynamic Vibration Reducer for Power Tools
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Solution Overview
Problem
Existing dynamic vibration reducers for power tools, such as hammers, are large due to the need for multiple driving mechanisms, making size reduction challenging and complicating installation space management.
Innovation Solution
A dynamic vibration reducer design featuring a body with coaxially disposed cylindrical members that move longitudinally, supported by elastic elements, and venting members that accommodate production variations, allowing for reduced size and easier mounting by eliminating the need for additional elastic element receiving members and providing positional adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional dynamic vibration reducer is designed with separate elastic element receiving members, then the mounting structure is stable, but the overall size increases and installation space requirements increase
Solution Approach 1:
The patent combines the elastic element receiving member function directly into the cylindrical member structure. The cylindrical member itself serves as both the moving component and the elastic element receiver, eliminating the need for separate receiving members. This merging of functions reduces the overall number of components and decreases the volume of the dynamic vibration reducer while maintaining stable mounting through the integrated structure.
2Ease of operation
If the cylindrical members are rigidly fixed to the tool body, then the mounting position is precise, but assembly variations cause mounting difficulties
Solution Approach 1:
The patent introduces mobility to the venting member by allowing it to move along the cylindrical member in the longitudinal direction. This dynamic capability enables the venting member to self-adjust its position to accommodate assembly variations in spacing between the venting member mounting parts and the venting members themselves, while still achieving proper mounting when the cylindrical members are in their correct positions.
Solution Approach 2:
The movable venting member acts as a self-adjusting mechanism that compensates for assembly variations automatically. During assembly, the venting member can slide to the appropriate position to match the mounting parts, eliminating the need for high-precision pre-positioning and making the mounting process more forgiving of normal manufacturing tolerances.
3Adaptability or versatility
If multiple separate components are used in the dynamic vibration reducer, then each component can be optimized independently, but the overall device size and installation complexity increase
Solution Approach 1:
The patent employs a nested arrangement where the weight is housed within the body, and the cylindrical members are disposed coaxially within each other. The venting members are positioned on the cylindrical members, creating a compact nested structure. This nesting allows multiple functional components to be optimized independently while occupying minimal space, reducing the longitudinal length of the dynamic vibration reducer.
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 solution effectively reduces the size of the dynamic vibration reducer, simplifies installation, and accommodates assembly variations, enhancing mounting ease and reducing production costs while maintaining vibration reduction functionality.
Implementation Method 1
elastic elements to connect the weight to the body. The body includes a plurality of cylindrical members coaxially disposed to face each other and the cylindrical members are assembled into the body such that the cylindrical members can move with respect to each other in the longitudinal direction. Each elastic element exerts biasing force on the cylindrical members such that the cylindrical members are held apart from each other.
Implementation Method 2
A venting member for a forced vibration is provided on each of the cylindrical members and protrudes radially outward from the cylindrical member. The venting member is mounted by inserting into a venting member mounting part on the tool body side in a direction transverse to the longitudinal direction of the cylindrical member. At least one of the venting members can move with respect to the one cylindrical member in the longitudinal direction. In an impact tool in which the actuating mechanism has, for example, a crank mechanism that converts rotational output of the motor to linear motion and a striking element that is driven via an air spring action by the crank mechanism, the 'venting member for forced vibration' may be provided by utilizing pressure fluctuations caused when the crank mechanism is driven in order to effect forced vibration of the weight of the dynamic vibration reducer.
Data Source
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AI summary
It is an object of the invention to reduce size of a dynamic vibration reducer in a power tool. A power tool according to the invention includes a dynamic vibration reducer 151 having a body 153, a weight 155 and elastic elements 157, 159. The body 153 is formed by a plurality of cylindrical members 161, 163 which are coaxially disposed to face each other. The elastic elements 157, 159 exert biasing forces on the cylindrical members 161, 163 such that the cylindrical members 161, 163 are held apart from each other. The cylindrical members 161, 163 are fixed to the tool body 103 side under the biasing forces of the elastic elements 157, 159. Venting members 167, 169 for forced vibration are provided on the cylindrical members 161, 163 and protrude radially outward from the cylindrical members 161, 163, respectively. The venting members 167, 169 are mounted by inserting into venting member mounting parts 181, 182 on the tool body 103 side in a direction transverse to the longitudinal direction of the cylindrical members 161, 163. At least one of the venting members 167 can move with respect to the cylindrical member 161 in the longitudinal direction.