Auxiliary Pump Driven by Output Shaft for Transmission Lubrication
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Solution Overview
Problem
Transmission devices with main transmission pumps driven by the engine have limited towing ability due to insufficient hydraulic fluid supply during towing processes, leading to high thermal loading and potential seizing of transmission components, and the addition of auxiliary pumps increases production costs and electrical load.
Innovation Solution
A transmission device with a hydraulic system that includes a main transmission pump and an auxiliary pump driven by the transmission output shaft, allowing for continuous hydraulic fluid supply during towing and varying operating conditions without additional power sources, and featuring a coupling device for efficient engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary pump device is added to supply hydraulic fluid during towing operations, then the lubrication and cooling of transmission components is improved, but the production costs and device complexity increase
Solution Approach 1:
The auxiliary pump device is integrated into the existing transmission housing structure, merging its mounting space with the transmission case. The auxiliary pump shares the hydraulic fluid reservoir and filtering system with the main pump, combining multiple functions into a unified structure that reduces overall complexity despite adding functionality.
Solution Approach 2:
The auxiliary pump is designed to perform multiple functions: it supplies hydraulic fluid during towing operations when the main pump is inactive, provides additional flow capacity during high-demand operating conditions, and can function independently if the main pump fails. This multi-functionality justifies the added complexity by enhancing system reliability across various operating scenarios.
2Reliability
If an auxiliary pump device is added to supply hydraulic fluid during towing operations, then the lubrication and cooling of transmission components is improved, but the production costs increase
Solution Approach 1:
The auxiliary pump utilizes the existing transmission housing as its mounting structure and shares the hydraulic fluid reservoir, filtering system, and sealing arrangements with the main pump. This merging approach allows the auxiliary pump to be manufactured and assembled as part of the transmission assembly process, reducing tooling costs and simplifying production planning compared to manufacturing a completely separate pump system.
3Reliability
If the auxiliary pump is always engaged with the transmission output shaft, then hydraulic fluid supply is ensured, but power losses occur during non-essential operation
Solution Approach 1:
The auxiliary pump is equipped with a dynamic engagement mechanism that connects or disconnects the pump from the transmission output shaft based on operating conditions. During normal operation when the main pump is active, the auxiliary pump is disengaged to avoid power losses. During towing operations or when hydraulic fluid demand exceeds main pump capacity, the auxiliary pump is automatically engaged to provide additional flow, thus optimizing the balance between reliability and energy efficiency.
4Adaptability or versatility
If the auxiliary pump is placed outside the transmission housing, then installation flexibility is improved, but structural space is occupied and connection complexity increases
Solution Approach 1:
The auxiliary pump is nested within the transmission housing structure, utilizing the internal cavity space of the transmission case for pump mounting. The pump is positioned such that it shares the same external envelope as the transmission, eliminating the need for additional external space. This nested arrangement maintains installation flexibility while avoiding occupation of additional structural space in the vehicle.
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
Ensures sufficient lubrication and cooling of transmission components during towing and electric driving, reducing production costs and structural space requirements while maintaining high efficiency by eliminating the need for separate drives and minimizing power losses.
Implementation Method 1
an auxiliary pump by virtue of which the hydraulic system can likewise be supplied with hydraulic fluid
Implementation Method 2
with a coupling device allowing selective engagement to prevent power losses during non-essential operation
Implementation Method 3
Ensures adequate lubrication and cooling of transmission components during towing and varying operating conditions
Data Source
AI summary
A transmission device (1) with a hydraulic system (4) comprising a main transmission pump device for supplying various transmission components with hydraulic fluid. The main transmission pump device is driven by torque applied to the transmission input shaft (2). A force flow between the transmission input shaft (2) and transmission output shaft (3) is produced by various hydraulically actuated transmission components. When the hydraulic system (4) is not supplied by the main transmission pump, the force flow is interrupted. The hydraulic system (4) has an auxiliary pump device (5) by virtue of which the hydraulic system (4) too can be supplied with hydraulic fluid. The auxiliary pump device (5) is driven by torque applied to the transmission output shaft (3) at least when the force flow is interrupted.