Hydraulic Fracturing Pump Pinion Assembly for Backlash Adjustment
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Solution Overview
Problem
Hydraulic fracturing pumps face challenges in adjusting backlash between gears, leading to premature wear and excessive heating due to tight mesh, and difficulty in achieving optimal mechanical engagement, which affects the longevity and efficiency of high-pressure operations.
Innovation Solution
The use of separate pinion shafts with a keyless coupler allows independent adjustment of backlash for each pinion gear, enabling optimal alignment and reducing the need for radial rotation, thereby minimizing wear and maintaining mechanical integrity during extended high-pressure operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tight gear mesh is used to achieve optimal mechanical engagement, then mechanical efficiency is improved, but gear wear increases and excessive heating occurs
Solution Approach 1:
The bull gear is designed with adjustable positioning relative to the pinion gear, allowing the mesh tightness to be dynamically optimized. The bull gear can be positioned to achieve the correct balance between mechanical engagement and wear prevention, resolving the contradiction between efficiency and reliability
2Reliability
If loose gear mesh is used to reduce wear, then gear longevity is improved, but mechanical engagement becomes suboptimal causing excess stress on gear teeth
Solution Approach 1:
The adjustable bull gear positioning allows optimization of the mesh clearance to prevent excessive stress on gear teeth while maintaining sufficient engagement. This dynamic adjustment capability enables the system to achieve both gear longevity and structural integrity
3Device complexity
If fixed gear positioning is used to simplify the system, then device complexity is reduced, but backlash adjustment becomes difficult affecting operational precision
Solution Approach 1:
The bull gear is designed with adjustable positioning capability along the pinion shaft, allowing backlash to be optimized during assembly or operation. This simple yet effective mechanism provides precision adjustment without adding significant system complexity
Data Source
AI summary
A hydraulic fracturing pump includes a pinion assembly extending along a pinion axis and mounted in a crankcase, and having a first pinion shaft and a second pinion shaft coupled together by a keyless coupler. Each pinion shaft includes an input pinion gear mounted on one end of the pinion shaft. A crankshaft disposed along a crankshaft axis is mounted in the crankcase, and is parallel with but spaced apart from the pinion axis. The crankshaft includes a bull gear mounted on each end of the crankshaft with each bull gear interconnected to an input pinion gear by an intermediate gear assembly. Each intermediate gear assembly extends along an intermediate axis parallel with, but spaced apart from, the crankcase and pinion axii. Each intermediate assembly has an intermediate shaft with a first intermediate gear meshed with a pinion gear and a second intermediate gear meshed with the bull gear.