Rear Cushion Device Rod-Side Mounting Segmentation
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Solution Overview
Problem
Conventional rear cushion devices with an entire length adjusting function face difficulties in shortening the entire length upon shortest length adjustment while maintaining a sufficient adjustment range, leading to increased length and reduced rigidity due to the design of the mounting screw hole and joining member configuration.
Innovation Solution
The rear cushion device incorporates a rod-side mounting part with an inner member and an outer member, where the inner member is fixed to the rod and the tubular part of the outer member is screwed to the outer peripheral side, allowing for a greater screwing amount within the adjustment range and improved rigidity by positioning the tubular part closer to the axial side, thus shortening the entire length upon shortest adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mounting screw hole and joining member are configured to allow sufficient entire length adjustment range, then the entire length adjustment range is secured, but the entire length upon shortest length adjustment becomes excessively long
Solution Approach 1:
The rod-side mounting part is divided into two separate members: an inner member fixed to the rod and an outer member with the mounting screw hole. This segmentation allows the screwing amount of the inner member into the outer member to be increased independently, enabling sufficient entire length adjustment range while keeping the overall length shorter by positioning the tubular part closer to the axial side.
2Strength
If the screwing amount of the rod-shaped part into the mounting screw hole is increased to secure rigidity at longest length adjustment, then the rigidity is improved, but the entire length upon shortest length adjustment becomes even longer
Solution Approach 1:
By segmenting the mounting structure into inner and outer members, the patent enables independent optimization of the screwing amount for rigidity while controlling the overall length through the positioning of the tubular part, resolving the conflict between rigidity and length.
Solution Approach 2:
The patent repositions the tubular part closer to the axial side, utilizing the axial dimension more efficiently. This dimensional rearrangement allows the screwing amount to be increased for rigidity without proportionally increasing the overall length, as the tubular part occupies space more compactly along the axial direction.
3Ease of operation
If the joining member extends downward beyond the desired length to accommodate the mounting screw hole, then the mounting screw hole can accommodate sufficient screwing amount, but the device complexity and length increase
Solution Approach 1:
The joining member is segmented into an inner member (fixed to rod) and an outer member (with mounting screw hole). This allows the screwing interface to be distributed between two members rather than requiring a single excessively long joining member, reducing overall device complexity while maintaining adjustment capability.
Solution Approach 2:
By repositioning the tubular part closer to the axial side and distributing the mounting function across two members, the patent reduces the required length along the axial dimension, simplifying the overall device structure while preserving the screwing amount adjustment capability.
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 configuration enables the rear cushion device to achieve a shorter entire length upon shortest adjustment while maintaining a sufficient adjustment range and enhancing rigidity, reducing the screwing amount required for longest length adjustment, thereby improving the overall performance and usability.
Implementation Method 1
a spring (22) for absorbing shock
Implementation Method 2
a damper (23) configured to attenuate vibrations of the spring (22)
Implementation Method 3
a damper (23) configured to attenuate vibrations of the spring (22)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
There is provided a rear cushion device to be mounted between a vehicle main body and a rear suspension arm of a saddle ridden-type vehicle and including a spring and a damper. The damper includes: a cylinder; a piston; a rod; a cylinder-side mounting part; and a rod-side mounting part. The rod-side mounting part includes: a cylindrical inner member fixed to the other axial end side of the rod coaxially with the rod, and having an outer peripheral surface on which a screw is formed; and an outer member mounted to an outer peripheral side of the inner member. The outer member includes: a tubular part having an inner peripheral surface on which a screw to be screwed with the screw of the inner member is formed; and a coupling part for coupling the outer member to the vehicle main body or the rear suspension arm.