Transmission Mount Distributed Stoppers for NVH and Handling
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Solution Overview
Problem
Existing transmission mounts primarily focus on vibration attenuation but lack sufficient design to enhance ride quality and handling performance, as evident from previous technologies that have limitations in implementing these performance improvements.
Innovation Solution
A transmission mount configuration featuring a distributed stopper structure with both main and auxiliary stoppers operating in various directions, including up and down, front and rear, and left and right, utilizing an external core with internal wall surfaces contacting a strut to distribute pressure loads and improve NVH and R&H performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional single main stopper structure is used, then the structure is simple, but the ride quality and handling performance are insufficient
Solution Approach 1:
The stopper structure is divided into multiple segments: a lower main stopper and multiple auxiliary stoppers (front, rear, left, right) distributed at different positions on the external core. Each stopper handles specific directional forces, transforming a single complex stopper into multiple simpler distributed stoppers that collectively improve ride quality and handling performance.
Solution Approach 2:
The stopper system transitions from a one-dimensional single stopper to a three-dimensional distributed stopper arrangement. Auxiliary stoppers are positioned at front, rear, left, and right locations on the external core, creating spatial distribution that provides comprehensive vibration control in multiple directions simultaneously.
2Object-affected harmful factors
If vibration attenuation is prioritized, then vibration reduction is achieved, but noise and hardness performance are not sufficiently improved
Solution Approach 1:
Different portions of the external core are given different functional qualities: the lower portion contains the lower main stopper for vertical vibration attenuation, while the upper portion incorporates auxiliary stoppers (front, rear, left, right) that specifically address noise and hardness performance. This local differentiation allows each region to optimize for its specific function.
Solution Approach 2:
The transmission mount uses a composite structure combining rubber material for the external core and internal core with metal components (bracket, strut). This composite material approach enables simultaneous achievement of vibration attenuation through rubber damping and improved noise/hardness performance through the rigid metal strut and distributed stopper configuration.
3Reliability
If a distributed stopper structure with auxiliary stoppers is implemented, then NVH and R&H performance are improved, but the manufacturing complexity increases
Solution Approach 1:
Multiple stopper functions are merged into a single external core component. The auxiliary stoppers (front, rear, left, right) are integrated as protrusions or formed features of the external core itself, rather than being separate parts. This merging reduces assembly steps and manufacturing complexity while maintaining the distributed stopper configuration for improved NVH and R&H performance.
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 distributed stopper structure effectively enhances noise, vibration, and hardness performance, as well as ride quality and handling, by distributing pressure loads and improving vehicle control and durability.
Implementation Method 1
the lower portion 22a attenuates omnidirectional vibrations while contacting with a lower stopper 31, an upper stopper 32, a first side stopper 33, and a second side stopper 34 formed in a housing of the insulator
Implementation Method 2
the distributed stoppers may be operated in the respective directions, and as a result, it is possible to further improve noise, vibration, and hardness (NVH) performance of the vehicle, and to improve R&H performance of the vehicle
Data Source
AI summary
A transmission mount for a vehicle may include a bracket which accommodates an insulator having an external core coupled with an internal core, and includes an upper housing that covers an upper portion of the insulator, and a plate that supports a lower portion of the insulator; and the external core which includes, based on the inserted internal core, a lower portion, an upper portion, both lateral portions, both bridge portions that support a body of the external core, and a lower main stopper formed on an upper surface of the plate, in which a space portion is formed in a body of the external core wherein a strut, which protrudes from a rear surface of an upper housing of the bracket, is inserted into the space portion, and internal wall surfaces of the space portion come into contact with an upper portion, a lower portion, and a front portion of the strut, respectively.