Offset Starter Pinion Reduces Rotor-Stator Gap in KSG
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Solution Overview
Problem
Conventional drive train modules with crankshaft starter generators have increased mass and center of gravity distance from the bearing point, leading to larger gaps between the rotor and stator, which reduces efficiency due to increased component elasticity and radial movements.
Innovation Solution
The drive train module positions the starter pinion radially offset from the rotor and stator, allowing for a smaller gap between them, with the flywheel designed to accommodate the starter pinion within its housing, reducing the distance to the crankshaft bearing and minimizing radial movements, thus enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the KSG rotor is connected to the flywheel, then the starter and generator function are integrated, but the mass and center of gravity distance increase leading to larger gaps between rotor and stator
Solution Approach 1:
The patent repositions the starter pinion from a radial arrangement (at the same height as rotor and stator) to an axial arrangement (below the rotor and stator). This dimensional change allows the pinion to engage the ring gear without occupying the radial space needed for minimizing rotor-stator gap, thus resolving the contradiction between integration and gap reduction.
2Ease of operation
If the starter pinion is arranged at the same height as rotor and stator, then engagement is simplified, but radial movements increase due to increased center of gravity distance
Solution Approach 1:
The starter pinion is moved from the radial plane (same height as rotor/stator) to the axial direction (below rotor and stator). This repositioning reduces the center of gravity distance to the crankshaft bearing, minimizing radial movements while maintaining engagement functionality through the ring gear on the flywheel.
3Reliability
If a larger gap is provided between rotor and stator to accommodate radial movements, then component elasticity is accommodated, but KSG efficiency decreases
Solution Approach 1:
By relocating the starter pinion axially below the rotor and stator, the patent reduces the center of gravity distance, thereby minimizing radial movements. This allows the rotor-stator gap to be minimized for improved efficiency while still accommodating normal component elasticity through reduced radial displacement.
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 configuration reduces radial movements and allows for a smaller gap between the rotor and stator, increasing the efficiency of the crankshaft starter generator and enabling a more compact design, potentially reducing the size of the KSG and minimizing vibrations.
Implementation Method 1
an electric starter motor with a starter pinion, which can be brought into engagement with this to rotate the ring gear
Implementation Method 2
electric crankshaft starter generators (KSG) are provided between the engine and transmission. These are electrical machines with a starter and generator function
Data Source
AI summary
The invention relates to a drive train module for a motor vehicle, comprising a to the crankshaft (1) connected to said flywheel (24); one connected to the crankshaft (1) operatively connected to a crankshaft starter generator, comprising a rotor (6) and a stator (7); a flywheel (24) arranged ring gear (25) and an electric starter motor (19a) with a starter pinion (19) which is engaged to rotate the ring gear with this can be brought and / or is engaged, wherein the starter pinion in a radial direction, perpendicular to the crankshaft axis (M) is offset with respect to the rotor (6) and / or the stator (7) is arranged the crankshaft starter generator.