Bush-Type Transmission Mount With Orifice And Membrane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bush-type hydraulic transmission mounts have limitations in tuning vibration damping characteristics and dynamic performance due to a short orifice and absence of a membrane, restricting their ability to effectively attenuate vibrations and improve NVH performance.
Innovation Solution
A bush-type transmission mount with an orifice directly formed to a desired length in a core, coupled with a membrane fitted into the orifice, allowing fluid communication between fluid chambers and enhancing vibration damping, low-frequency idle, and high-frequency dynamic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bush-type transmission mount uses a short orifice structure, then the device complexity is reduced and manufacturing is easier, but the vibration damping characteristics and tuning flexibility are limited
Solution Approach 1:
The orifice is nested within the core structure, with the membrane inserted into the orifice passage. This nested configuration allows a long effective orifice length to be achieved within a compact core diameter, maintaining structural simplicity while improving vibration damping characteristics through extended fluid flow path.
Solution Approach 2:
The invention changes the parameter of orifice length from short to long by extending the orifice passage through the core. This parameter change enables better tuning of vibration damping characteristics while the membrane addition provides further control over fluid flow and dynamic response.
Solution Approach 3:
The membrane acts as an intermediary element inserted into the orifice passage. It controls fluid flow between fluid chambers by deforming in response to pressure changes, thereby enhancing vibration damping characteristics and providing tuning flexibility without requiring a completely different structural design.
2Reliability
If a membrane is added to the transmission mount, then low-frequency idle and high-frequency dynamic characteristics are improved, but the device complexity increases
Solution Approach 1:
The membrane is nested within the orifice passage of the core, utilizing the existing structural space. This nesting approach adds the membrane function without requiring separate external components or significantly increasing overall device complexity, as the membrane integrates within the existing orifice structure.
Solution Approach 2:
The membrane serves multiple functions: it controls fluid flow between chambers, improves low-frequency idle characteristics, and enhances high-frequency dynamic response. This multi-functionality justifies the added complexity by providing comprehensive vibration attenuation across different frequency ranges through a single integrated component.
3Adaptability or versatility
If the orifice length is extended in the core, then vibration damping tuning flexibility is improved, but the core diameter and manufacturing difficulty increase
Solution Approach 1:
The orifice is designed as a nested passage within the core structure, allowing extended length along the axial direction while maintaining a compact radial profile. This nesting configuration achieves long orifice length for tuning flexibility without proportionally increasing core diameter or manufacturing complexity.
Solution Approach 2:
The combination of the extended orifice and flexible membrane creates a dynamic system where fluid flow and membrane deformation work together to provide vibration damping. The extended orifice length enables tuning of the hydraulic response characteristics, while the membrane adds dynamic compliance, together providing adaptability across different operating conditions.
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 achieves improved vibration-damping characteristics, enhanced dynamic performance, and flexibility in tuning to suit specific vehicle models by allowing fluid flow and membrane deformation, effectively attenuating both large and small displacement vibrations.
Implementation Method 1
a membrane (40) mounted in the portion of the orifice (32) that communicates with the first fluid chamber (21), among the entire length of the orifice (32) formed in the orifice block (31)
Implementation Method 2
an orifice (32), which is a fluid passage, is directly formed in a core (30) to connect a first fluid chamber (21) and a second fluid chamber (36)
Data Source
AI summary
A bush-type transmission mount, in which an orifice, operating as a fluid passage that connects a first fluid chamber and a second fluid chamber to each other, is directly formed to a desired length in a core that is coupled to a main rubber to improve vibration-damping characteristics. A membrane is fitted into an outlet portion of the orifice, which communicates with the first fluid chamber, in a sliding manner, thereby improving low-frequency idle vibration and high-frequency dynamic characteristics.