Starting Device Pinion Ring Gear Collision Noise Reduction
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Solution Overview
Problem
The existing starting devices for internal combustion engines often experience collision noise between the pinion gear and the ring gear due to mismatched rotational speeds during the engine starting process, which can lead to increased wear and noise.
Innovation Solution
A starting device that includes a drive instruction unit to rotate the ring gear via the crankshaft before the motor engages, using a multi-phase AC motor to control the rotational angular acceleration and ensure proper engagement of the pinion gear with the ring gear, thereby reducing collision noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor directly rotates the pinion gear without pre-synchronization, then the starting response is faster, but collision noise occurs due to mismatched rotational speeds between pinion gear and ring gear
Solution Approach 1:
The rotating electrical machine performs preliminary rotation of the ring gear via the crankshaft before the motor engages the pinion gear. This preliminary action synchronizes the rotational speeds of the pinion gear and ring gear, preventing collision noise during engagement while maintaining fast starting response.
Solution Approach 2:
The rotating electrical machine acts as an intermediary between the motor and the ring gear. It mediates the speed mismatch by rotating the ring gear in advance, enabling smooth engagement between the pinion gear and ring gear without direct collision.
2Device complexity
If the rotational angular acceleration is not controlled, then the engagement process is simpler, but wear increases due to impact during engagement
Solution Approach 1:
The system dynamically controls the rotational angular acceleration of the ring gear during the engagement process. By adjusting the acceleration profile, the system minimizes impact forces during gear engagement, reducing wear and improving durability while maintaining engagement simplicity.
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
The solution effectively reduces collision noise and improves durability by ensuring the ring gear and pinion gear engage smoothly, with controlled rotational speeds, minimizing the impact during the starting process.
Implementation Method 1
using a multi-phase AC motor to control the rotational angular acceleration
Data Source
AI summary
A starting device is used in a starting system that includes a starting electric motor unit and a rotating electrical machine; the starting electric motor unit including a motor that rotates a pinion gear, and a pushing member that pushes out the pinion gear toward a ring gear, the ring gear rotating together with a crankshaft of an engine; the rotating electrical machine being connected to the crankshaft and rotating the crankshaft; the starting system being configured to push, using the pushing member, the pinion gear toward the ring gear, and drive the motor to rotate, based on driving force of the motor, the ring gear via the pinion gear, thus starting the engine. The starting device includes a drive instruction unit that instructs the rotating electrical machine to rotate the ring gear via the crankshaft during a pre-drive period before drive of the motor.