Crosshead Linear Drive Layout Without Thrust Seat for Lower Wear
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Solution Overview
Problem
The existing linear drive assemblies in hydraulic fracturing operations experience high wear rates due to extreme pressures and vibrations, leading to frequent maintenance needs and reduced operational efficiency.
Innovation Solution
The design of a linear drive assembly that eliminates the thrust seat and incorporates a needle roller bearing with wear pads and a larger wrist pin, reducing stress on components and extending maintenance intervals by distributing load and using wear-resistant materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear drive assemblies are used with thrust seats and standard wrist pins, then the structure is simpler and easier to manufacture, but wear rates are high due to extreme pressures and vibrations
Solution Approach 1:
The patent removes the thrust seat component from the linear drive assembly, extracting the harmful sliding contact interface that caused high wear rates. The connecting rod directly connects to the crosshead without an intermediate thrust seat, eliminating the primary wear source while maintaining structural integrity through the needle roller bearing.
Solution Approach 2:
The patent replaces the traditional sliding contact mechanism (thrust seat) with a rolling contact mechanism (needle roller bearing). This substitution transforms the friction-based wear problem into a rolling contact system that significantly reduces wear rates and extends maintenance intervals under extreme hydraulic fracturing conditions.
2Duration of action of moving object
If standard wrist pins and connecting rods are used, then manufacturing is easier, but maintenance frequency increases due to high wear rates
Solution Approach 1:
The patent employs composite construction in the connecting rod assembly, combining different materials and components (needle roller bearing, wear pads, reinforced wrist pin) to create a system that withstands extreme pressures and vibrations. This composite approach extends maintenance intervals while remaining manufacturable through standard industrial processes.
Solution Approach 2:
The patent modifies critical design parameters including increasing wrist pin diameter, adding needle roller bearings, and incorporating wear pads to change the operational characteristics of the linear drive assembly. These parameter changes reduce wear rates and extend maintenance intervals without making the components excessively complex to manufacture.
3Strength
If thrust seats are included in the linear drive assembly, then load distribution is simpler, but stress concentration increases on the thrust seat components
Solution Approach 1:
By removing the thrust seat entirely, the patent eliminates the stress concentration point that developed on traditional sliding contact surfaces. The load is redistributed through the needle roller bearing and directly through the connecting rod to the crosshead, avoiding the localized stress peaks that caused premature failure in conventional designs.
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 significantly reduces wear and maintenance requirements, increasing the operational time between maintenance intervals and enhancing the efficiency of hydraulic fracturing operations.
Implementation Method 1
incorporates a needle roller bearing with wear pads
Implementation Method 2
reducing stress on components and extending maintenance intervals by distributing load
Data Source
AI summary
A linear drive assembly configured for use within a power end assembly. The linear drive assembly is configured to interconnect a crankshaft and a pony rod and comprises a crosshead assembly attached to a connecting rod assembly. In one or more embodiments disclosed herein, the connecting rod assembly is configured to attach to opposite sides of the crosshead assembly so that no portion of the connecting rod assembly is disposed within an interior of a crosshead included in the crosshead assembly.