Transmission Mounting Unit With Integral Stopper
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Solution Overview
Problem
Conventional transmission mounting units face challenges in effectively attenuating complex vibrations across a wide frequency band, leading to reduced ride comfort and durability due to limitations in dynamic characteristics and increased costs associated with additional stoppers, which also compromise noise, vibration, and harshness (NVH) performance.
Innovation Solution
A transmission mounting unit featuring double outer pipes and an integral stopper, eliminating the need for a conventional additional stopper bonding process, with a bush unit design that includes a first and second outer pipe, insulators, and an inner core, where the stopper is integrated with the insulators to absorb vibrations and maintain durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If insulators are used in the transmission mounting unit, then vibration insulation is provided, but dynamic characteristics cannot be reduced in the idle region and driving performance deteriorates
Solution Approach 1:
The mounting unit is divided into multiple functional components: insulators for vibration insulation, a stopper for displacement control, and a bonding agent for structural integration. This segmentation allows each component to optimize its specific function without compromising overall performance.
Solution Approach 2:
A bonding agent is introduced as an intermediary substance between the insulator and the stopper/outer pipe structure. This bonding agent creates a integrated system where the insulator can provide vibration insulation while the stopper controls displacement, resolving the contradiction between vibration insulation and driving performance.
2Reliability
If an additional stopper is provided to reduce insulator displacements, then durability is improved, but constituent elements increase, assembly process becomes complicated, and manufacturing cost increases
Solution Approach 1:
The stopper is integrated with the outer pipe structure through bonding, merging two components into a unified assembly. This reduces the number of separate constituent elements and simplifies the assembly process while maintaining the displacement control function for improved durability.
Solution Approach 2:
The outer pipe structure serves multiple functions: it provides structural support, acts as a mounting component, and when bonded with the stopper, becomes part of the displacement control system. This multi-functionality reduces the need for separate dedicated components.
3Manufacturing precision
If an additional stopper is bonded through adhesive, then displacement control is achieved, but the stopper is vulnerable to heat and contamination and may be separated from the insulators
Solution Approach 1:
The bonding agent is selected and applied with consideration of future exposure to heat and contamination. The bonding process is designed to create a robust connection that anticipates and resists environmental degradation, preventing separation under harsh operating conditions.
Solution Approach 2:
The mounting unit employs composite material strategies by using a bonding agent that creates a integrated structure between the stopper and outer pipe. This composite approach enhances the overall durability and resistance to environmental factors compared to simple mechanical assembly.
4Ease of manufacture
If conventional mounting units are used, then assembly is simple, but complex vibrations across wide frequency band cannot be attenuated and ride comfort deteriorates
Solution Approach 1:
The mounting unit is segmented into specialized components: insulators for vibration attenuation across different frequency bands, a stopper for displacement control, and a bonding agent for integration. This segmentation enables effective attenuation of complex vibrations while maintaining reasonable assembly simplicity through modular design.
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 solution efficiently attenuates large amplitude vibrations, improves ride comfort and durability, reduces manufacturing costs, and enhances NVH performance by simplifying the assembly process and preventing stopper separation, thereby increasing the vehicle's commercial value and dependability.
Implementation Method 1
insulators for insulating a vibration are applied to the engine mounting unit and the transmission mounting unit
Implementation Method 2
bonding an additional stopper formed of a rubber material through the gap to reduce displacements of the insulators
Data Source
AI summary
The transmission mounting unit for a vehicle includes a mounting bracket in which a cylindrical mounting unit is formed, mounting ends fixed to a vehicle body that are integrally formed on both sides of the mounting unit, and a bush unit inserted into the mounting unit of the mounting bracket. The bush unit has a first outer pipe that forms an outer shell to be inserted into the mounting unit, a first insulator bonded to an internal circumference of the first outer pipe and integrated with a stopper protruding from the first through hole, a second outer pipe inserted into the first outer pipe, an inner core disposed in a center of the second outer pipe, and a second insulator having an external circumference bonded to an internal circumference of the second outer pipe while surrounding an external circumference of the inner core.