Telescoping Hydraulic Bump Stop for Bottoming-Out Damping Control
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Solution Overview
Problem
Conventional bump stops, whether made of rubber or urethane, or hydraulic nitrogen, face issues such as energy dissipation during rebound, stress on shock components, and require additional space and labor for installation, while separate hydraulic bump stops are prohibited in some racing regulations and inefficient in damping suspension movement.
Innovation Solution
A hydraulic bump stop assembly featuring a telescoping hydraulic cylinder with an outer and inner coaxial cylinder, a fluid reservoir, and adjustable orifices for damping control, integrated with the shock absorber to prevent bottoming out and provide controlled damping during compression and expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rubber or urethane bump stops are used, then the shock absorber is protected from bottoming out, but energy is dissipated into suspension rebound causing stress on the shock and offering little damping
Solution Approach 1:
The patent combines the bump stop function with the shock absorber by integrating a telescoping hydraulic cylinder into the shock assembly. The inner cylinder telescopes within the outer cylinder, sharing the same space and working fluid as the shock absorber, thereby eliminating the need for separate bump stop components while providing both bottoming-out protection and damping control through the same hydraulic system
Solution Approach 2:
The invention uses hydraulic fluid and orifices to create velocity-sensitive damping control. As the telescoping cylinder compresses, hydraulic fluid is forced through restricted orifices, creating resistance that dampens the rebound motion. This hydraulic mechanism transforms the simple mechanical bump stop into an active damping system that controls energy dissipation rather than merely absorbing it
2Adaptability or versatility
If separate hydraulic bump stops are used, then damping control is improved, but additional space is required and installation labor and cost increase
Solution Approach 1:
The patent merges the bump stop and shock absorber into a single integrated assembly. The telescoping hydraulic cylinder is positioned within the shock absorber housing, sharing the same mounting points and working fluid reservoir. This integration eliminates separate bump stop components, reduces installation complexity, and maintains full damping control functionality through the unified hydraulic system
Solution Approach 2:
The hydraulic system serves multiple functions simultaneously: the shock absorber handles primary suspension damping while the telescoping cylinder provides bottoming-out protection and additional rebound damping control. The same hydraulic fluid and orifices serve both the shock absorber and bump stop functions, creating a multi-functional assembly that reduces overall system complexity
3Reliability
If conventional bump stops are used, then bottoming out is prevented, but they behave like pure coil springs offering little damping
Solution Approach 1:
The invention replaces the passive spring-like mechanical bump stop with an active hydraulic damping system. As the telescoping cylinder compresses during bottoming-out events, hydraulic fluid is forced through restricted orifices, creating velocity-dependent resistance that dampens the rebound motion. This transforms the bump stop from a simple mechanical stop into an active damping element that controls the rate of energy dissipation
Solution Approach 2:
The telescoping hydraulic cylinder provides dynamic damping control rather than static spring-like behavior. The damping force varies with the velocity of compression, creating higher resistance during rapid bottoming-out events while allowing smoother operation during normal suspension travel. This dynamic response is controlled by the orifice geometry and hydraulic fluid properties
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 telescoping hydraulic cylinder effectively prevents shock absorber bottoming out, provides adjustable damping ratios, and reduces stress on shock components, while being compact and integrated, thus enhancing vehicle suspension performance and compliance with racing regulations.
Implementation Method 1
Hydraulic bump stops also exhibit some rebound dampening as well. Conventional hydraulic bump stops are not integrated components of a shock. They are typically mounted separately to the vehicle suspension system and operate independently from the shock absorbers of the vehicle.
Implementation Method 2
Oil is used inside and moves through orifices much like a standard shock. This allows the bump to effectively dampen, or slow, the suspension movement through its final inches of travel.
Data Source
AI summary
Embodiments of a hydraulic bump stop assembly may include a telescoping hydraulic cylinder containing hydraulic fluid. The telescoping cylinder may be located on a vehicle shock. Components of the shock may engage and compress the telescoping cylinder during the final stages of compression of the shock to prevent the shock from bottoming out. The telescoping cylinder has damping properties during compression and expansion due to hydraulic fluid being forced through orifices of one or more hydraulic fluid lines to and from a reservoir. Damping ratios may be adjusted by adjusting the size of the orifices. In some embodiments, the damping ratios may be adjusted remotely, such as from the driver compartment of the vehicle.