Powered Hammer Lubrication via Piston-Driven Air Circulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pavement breakers typically operate with limited user maneuverability due to their weight, generating significant vibration and requiring effective lubrication distribution within their components to ensure efficient functioning.
Innovation Solution
A powered hammer design incorporating a housing with a tool holder, motor, cylinder, and piston, where a drive mechanism converts rotary motor output to reciprocating piston motion, utilizing air movement to circulate lubrication fluid through the system, including a crank shaft fluid guide and centrifugal force to direct lubrication towards critical components, and a dampening mechanism to reduce vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pavement breaker weight is increased to assist operation, then breaking capability is improved, but user maneuverability deteriorates
Solution Approach 1:
The patent employs a dampening mechanism with counterbalancing masses that move in opposition to the hammering action. This counterweight system reduces the effective weight felt by the operator during operation, improving maneuverability while maintaining the high breaking capability when the tool is in use.
Solution Approach 2:
The patent incorporates vibration dampening elements and cushioning mechanisms that are pre-positioned to absorb and reduce vibrations before they reach the operator. This beforehand cushioning allows the tool to maintain its heavy construction for breaking capability while reducing the perceived weight and vibration during operation.
2Strength
If pavement breaker weight is increased to assist operation, then breaking capability is improved, but vibration generation worsens
Solution Approach 1:
The patent utilizes controlled mechanical vibration through dampening mechanisms that counteract the harmful vibrations generated by the hammering action. The dampening system creates opposing vibrations that cancel out the harmful effects, allowing the heavy construction to maintain breaking capability while reducing harmful vibration output.
Solution Approach 2:
The patent converts the harmful vibrations and energy from the hammering action into beneficial dampening forces. The vibration dampening mechanism captures the excessive vibrational energy and transforms it into controlled movement of counterbalancing masses, thereby reducing harmful vibration while maintaining breaking effectiveness.
3Device complexity
If traditional lubrication system is used, then device complexity is reduced, but lubrication distribution efficiency deteriorates
Solution Approach 1:
The patent employs a lubrication system that utilizes the existing reciprocating motion of the piston and air pressure fluctuations within the cylinder to automatically circulate lubrication fluid throughout the drive mechanism. This self-service approach eliminates the need for external pumps or complex distribution systems while achieving effective lubrication of all moving parts.
Solution Approach 2:
The patent uses pneumatic principles by leveraging the air pressure fluctuations that naturally occur during piston reciprocation to drive the circulation of lubrication fluid. The pressure changes compress and move the lubrication fluid through passageways and channels, distributing it efficiently to critical components without requiring additional mechanical pumping systems.
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
Enhances user-friendly operation by minimizing vibration and ensuring efficient lubrication distribution within the pavement breaker, improving maneuverability and reducing wear and tear on components.
Implementation Method 1
A rear piston chamber is formed within an end of the cylinder, rearward of the piston, the volume of which repetitively changes as the piston moves within the cylinder, causing air within the housing to be at least one of drawn into and blown out of the rear piston chamber
Implementation Method 2
A crank shaft fluid guide and centrifugal force to direct lubrication towards critical components
Data Source
AI summary
A powered hammer includes a housing, a tool holder coupled to the housing and configured to hold a tool, a motor within the housing, a cylinder disposed within the housing, and a piston slideably mounted within the cylinder. A drive mechanism converts rotary output of the motor into a reciprocating motion of the piston. The drive mechanism includes a crank shaft rotationally driven by the motor, a drive pin eccentrically mounted on the crank shaft, and a con rod with a first end connected to the drive pin and a second end connected to the piston. A ram is slideably mounted forward of the piston that is reciprocatingly driven by the piston. A beat piece is slideably mounted forward of the ram. The beat piece is repetitively struck by the reciprocating ram, which in turn repetitively strikes an end of the tool when held in the tool holder to transfer the momentum of the ram to the tool. Lubrication fluid covers at least part of the drive mechanism. A rear piston chamber is formed within an end of the cylinder, rearward of the piston, the volume of which repetitively changes as the piston moves within the cylinder, causing air within the housing to be at least one of drawn into and blown out of the rear piston chamber. The movement of air causes the lubrication fluid to move within the housing. A longitudinal passageway defined in at least one of the crank shaft and the drive pin enables passage of air and the lubricating fluid to assist in movement of the lubrication fluid within the housing.