Hydraulic Hammer Power Cell Locking Without External Tie Rods
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Solution Overview
Problem
Hydraulic hammer assemblies with external tie rods are cumbersome, increase structural complexity, require frequent replacement, and complicate assembly/disassembly, necessitating special tools.
Innovation Solution
A power cell design featuring a head with a main bore, satellite bores, and a rotatable cylinder with protrusions and retainers, allowing for secure attachment without tie rods, using fasteners to engage lock walls and juts for compressive engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external tie rods are used to tie the front head to the valve body, then the structural strength is improved, but the device complexity increases and assembly/disassembly time increases
Solution Approach 1:
The patent removes the external tie rods from the hammer assembly, extracting the problematic component that caused increased complexity and assembly time while maintaining structural integrity through alternative internal design features
Solution Approach 2:
The patent integrates the fastening function directly into the head and valve body structures through internal features such as recesses, protrusions, and threaded bores, merging the tie rod function into the existing components to eliminate separate fastening elements
2Strength
If external tie rods are used to tie the front head to the valve body, then the structural strength is improved, but the manufacturing cost increases
Solution Approach 1:
By removing the external tie rods, the patent eliminates the need to manufacture, inventory, and install separate fastening components, reducing overall manufacturing cost while maintaining structural strength through integrated design features
Solution Approach 2:
The fastening function is merged into the head and valve body structures themselves, eliminating the need for separate tie rod components and their associated manufacturing, assembly, and maintenance costs
3Strength
If external tie rods are used to tie the front head to the valve body, then the structural strength is improved, but the assembly time increases
Solution Approach 1:
The patent eliminates the time-consuming process of installing and securing external tie rods by removing them from the design, reducing assembly time while maintaining structural integrity through alternative integrated fastening mechanisms
Solution Approach 2:
The head and valve body are designed with integrated fastening features such as recesses, protrusions, and threaded bores that allow for direct, tool-free, or simplified assembly, merging the connection function into the components themselves to eliminate separate fastening operations
4Strength
If external tie rods are used to tie the front head to the valve body, then the structural strength is improved, but the ease of repair decreases
Solution Approach 1:
By removing the external tie rods, the patent eliminates the need for special tools and complex procedures required to service tie rod connections, making repair and maintenance simpler while maintaining structural strength through integrated design features
Data Source
AI summary
The power cell for a hammer may comprise a head, a cylinder and a piston. The head may include a main bore, a satellite bore and a lower retainer. The main bore includes an upper chamber that includes a trough, first and second furrows, and a lock wall. The trough may include a port that extends from the main bore into the satellite bore. The lock wall may extend between the furrows. The lower retainer may be disposed in the satellite bore, and may include a core member and a jut. The core member may include a bore configured to receive a fastener. The cylinder may include a body and a protrusion on the body. The cylinder may be rotatable, wherein when in a locked position the protrusion is disposed in the port, the fastener is received in the bore, and the protrusion abuts the lock wall and the jut.