Hydraulic Pump Assembly Below Forward Driveshaft
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Solution Overview
Problem
In four-wheel drive vehicles, the presence of a forward driveshaft reduces clearance near the power take-off (PTO), making it challenging to mount larger hydraulic pumps without reducing drive clearance or requiring significant modifications to the transfer case.
Innovation Solution
A gearbox is connected to the PTO with a 1:1 gear ratio, allowing a variable displacement hydraulic pump to be positioned forward of the transfer case and below the forward driveshaft, maintaining full torque and clearance without intervening structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a larger variable displacement pump is used to compensate for RPM fluctuations and power equipment, then the pump size and hydraulic flow capability are improved, but the pump cannot be mounted due to insufficient clearance caused by the forward driveshaft
Solution Approach 1:
The patent repositions the pump from a横向 mounting arrangement to a纵向 arrangement beneath the driveshaft, utilizing the vertical dimension and available space under the driveshaft rather than competing for lateral clearance. This dimensional shift allows the pump to be mounted in previously unusable space.
Solution Approach 2:
The pump is positioned within the space envelope created by the driveshaft routing, effectively nesting the pump installation within the existing driveshaft clearance envelope. The pump occupies the void space beneath the driveshaft without interfering with driveshaft operation.
2Area of stationary object
If a gearbox with speed reduction gears is used to extend the driveshaft rearward, then the mounting space for the pump is improved, but torque is reduced due to the three-gear configuration
Solution Approach 1:
The patent extracts the pump from the traditional mounting location and repositions it beneath the driveshaft, eliminating the need for the Muncie gearbox entirely. This removes the source of torque reduction while still achieving the goal of adequate mounting space through alternative spatial arrangement.
3Area of stationary object
If the transfer case is modified to allow the driveshaft to extend through it, then the pump mounting clearance is improved, but significant time and labor are required for modification
Solution Approach 1:
The patent utilizes the existing driveshaft and its associated clearance space for a dual purpose: maintaining its original drivetrain function while simultaneously providing mounting space for the pump beneath it. This eliminates the need for transfer case modification while achieving adequate pump clearance.
Data Source
AI summary
A vehicle mounted hydraulic pump assembly includes a gearbox that is configured to be connected to a power take-off that is driven by a transmission of a four-wheel drive vehicle. The gearbox includes an input gear and an output gear where a radius of the input gear is the same as a radius of an output gear. A female output connector is associated with the output gear and is configured to be disposed below a forward driveshaft that is associated with the transmission. A hydraulic pump is connected to the gearbox and is configured to be disposed forward of a transfer case that is also associated with the transmission.