Cab Mount Structure for Roll Stiffness Without Ride Harshness
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Solution Overview
Problem
Conventional cab mounts face challenges in setting a large spring constant in the prizing direction without increasing the spring constants in the axial and axis-perpendicular directions, which affects ride comfort and cabin stability during turns.
Innovation Solution
The cab mount incorporates an upper mount with an elastic body and a reinforcement member featuring a tubular portion extending in the axial direction, which is embedded and bonded to the lower portion of the elastic body. This configuration allows for a large spring constant in the prizing direction while minimizing the impact on the spring constants in the axial and axis-perpendicular directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the spring constant of the upper mount in the prizing direction is increased to suppress cabin rolling during turns, then the spring constant in the axial direction and axis-perpendicular direction also increases, which deteriorates ride comfort performance
Solution Approach 1:
The reinforcement member is positioned specifically at the lower portion of the elastic body, creating local structural reinforcement. This localized reinforcement increases the prizing direction spring constant while minimizing impact on other directions, as the reinforcement member's tubular portion extends in the axial direction and is arranged off to the upper side of the insertion rubber part
Solution Approach 2:
The upper mount combines the elastic body (rubber material) with the reinforcement member (metal or rigid material) to create a composite structure. This composite design allows the reinforcement member to provide additional stiffness in the prizing direction through its tubular portion extending in the axial direction, while the elastic body maintains compliance in other directions
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 increases the spring constant in the prizing direction, enhancing cabin stability during turns, while maintaining soft spring characteristics in the axial and axis-perpendicular directions to ensure good ride comfort.
Implementation Method 1
a reinforcement member including a tubular portion that extends in an axial direction and being embedded in and bonded to a lower portion of the elastic body
Implementation Method 2
the cab mount has an upper mount and a lower mount assembled as sandwiching a first vehicle member (the chassis frame), and is fixed to a second vehicle member (the cabin) by a fixing shaft inserted through the upper mount and the lower mount. When a load is input in the direction of approach between the first vehicle member and the second vehicle member (the bound direction), the upper mount is compressed and deformed to elastically support the load and exhibit attenuating action owing to internal friction and the like
Data Source
AI summary
A cab mount including: an upper mount and a lower mount configured to be assembled as sandwiching a first vehicle member; a fixing shaft inserted through the upper mount and the lower mount so as to fix the cab mount to a second vehicle member; an elastic body constituting the upper mount; an insertion rubber part provided at a lower end of the elastic body and configured to extend between the first vehicle member and the fixing shaft in a radial direction; and a reinforcement member including a tubular portion that extends in an axial direction and being embedded in and bonded to a lower portion of the elastic body, the reinforcement member being arranged off to an upper side of the insertion rubber part.