Hybrid Drive Input Shaft Integration for Space Reduction
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Solution Overview
Problem
Existing hybrid drives for vehicles require a large installation space due to the arrangement of two electric machines, a hydraulic pump, and an input shaft, making them economically inefficient.
Innovation Solution
A hybrid drive design that incorporates a single electric machine connected to the input shaft of the vehicle transmission, with a hydraulic pump fixed to the input shaft, eliminating the need for a separate drive and allowing for a space-saving arrangement, and optionally using a torque converter or free-wheel clutch to generate oil pressure, and integrating the hydraulic pump with a second electric machine for further space optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If two electric machines and a hydraulic pump are arranged separately in the hybrid drive, then sufficient oil pressure can be generated for transmission control, but the installation space becomes excessively large
Solution Approach 1:
The patent merges the hydraulic pump with the input shaft of the vehicle transmission by connecting the pump's drive shaft to the input shaft. This integration eliminates the need for a separate drive mechanism for the hydraulic pump, thereby reducing the number of components and minimizing installation space while ensuring the pump receives adequate rotational drive from the input shaft
Solution Approach 2:
The input shaft of the vehicle transmission is given a dual function: it serves both as the input for the transmission and as the drive shaft for the hydraulic pump. This multi-functionality reduces the overall component count and simplifies the hybrid drive system architecture
2Ease of manufacture
If a hydraulic pump with separate drive is used, then oil pressure can be controlled independently, but production costs increase due to additional components
Solution Approach 1:
By integrating the hydraulic pump directly to the input shaft, the patent reduces the number of parts that need to be manufactured and assembled, thereby lowering production costs. The merged design eliminates separate mounting brackets, additional shafts, and associated fasteners while maintaining the pump's operational reliability
3Area of stationary object
If the hydraulic pump is connected to the input shaft, then installation space is reduced, but the pump requires sufficient rotational speed to generate adequate oil pressure
Solution Approach 1:
The patent introduces a torque converter or free-wheel clutch as an intermediary between the input shaft and the hydraulic pump. These intermediary components can provide rotational speed multiplication or one-way coupling, allowing the pump to achieve the necessary rotational speed for adequate oil pressure generation even when directly connected to the input shaft
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
This design reduces installation space and production costs while ensuring sufficient oil pressure for transmission control, allowing for efficient operation using either the electric machine or internal combustion engine, and enabling precise oil pressure management for various driving conditions.
Implementation Method 1
a hydraulic pump for the vehicle transmission (2) located between an internal combustion engine (1) and a vehicle transmission (2) with changeable gear ratio
Implementation Method 2
a torque converter connected to the hydraulic pump, is arranged between the internal combustion engine and the vehicle transmission
Data Source
AI summary
The invention proposes a hybrid drive for a vehicle with a power train, which has a first electric machine (4), which is permanently connected to an input shaft (3) of the vehicle transmission (2) arranged between an internal combustion engine (1) and a vehicle transmission (2) with changeable gear ratio, and which can be operated as an engine or as a generator, and a hydraulic pump (5) for the vehicle transmission (2), in which at least one first shiftable clutch device (7) is arranged between the internal combustion engine (1) and the vehicle transmission (2), and in which the hydraulic pump (5) is torque-proof connected to the input shaft (3) of the vehicle transmission (2). A hybrid drive is also proposed, which comprises two electric machines, in which the hydraulic pump (5) is coupled via at least one element for force transfer to the input shaft (3) of the vehicle transmission (2).