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.

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.

Provided are a lubricant composition for shock absorbers, a lubricant additive, and a method of adjusting friction characteristics of a lubricant composition for shock absorbers, each capable of satisfying both the operational stability and ride comfort. The lubricant composition for shock absorbers contains a base oil and a friction adjusting agent, the friction adjusting agent contains pentaerythritol esters, and the pentaerythritol esters contain a pentaerythritol tetraester and a pentaerythritol ester other than the pentaerythritol tetraester.

A suspension unit has a piston assembly connected to an adjuster. The piston assembly has three or more concentric cylindrical bodies including: an outer tube; an inner tube, and a dampener rod. The dampener rod is inside and concentric to the inner tube. The outer tube is rigidly connected to the dampener rod. The inner tube is telescopically mounted to the outer tube. The inner tube is inside and concentric to the outer tube. The adjuster has an adjuster compression entry port. The axle clamp rebound port connects to an adjuster block rebound entry port. The adjuster block has a high-speed compression cavity formed on an end of the adjuster block.

A method for controlling an elastic mount configured to support a propulsion device with respect to a marine vessel, wherein the elastic mount contains an electromagnetic fluid and an electromagnet and is configured such that adjusting an amount of electricity applied to the electromagnet changes a shear strength of the electromagnetic fluid in the elastic mount and thereby controls an elasticity of the elastic mount. The method includes applying a first amount of electricity to the electromagnet to produce an initial elasticity of the elastic mount measuring an oscillation of the propulsion device with a motion sensor, determining that the oscillation of the propulsion device exceeds a threshold oscillation, and adjusting the amount of electricity applied to the electromagnet to change the elasticity of the elastic mount to reduce the oscillation.

The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.

The damper assembly includes a tubular member, a rod, a primary piston, a secondary piston, and a resilient member. The tubular member includes a sidewall and a cap positioned at an end of the sidewall. The sidewall and the cap define an inner volume. The sidewall includes a shoulder separating the tubular member into a first portion and a second portion. The resilient member is disposed between the secondary piston and the cap and thereby is positioned to bias the secondary piston into engagement with the shoulder.

Provided is an on-demand shock stiffening system. The on-demand shock stiffening system operates to immediately stiffen the shocks in response to a user activating the system. The system may include a main body with an oil flow aperture and a flow control system that operates to restrict the flow of oil between the reservoir and the shock. The on-demand shock stiffening system may be coupled between the reservoir and the bridge of the shock and operates to restrict flow of the oil in order to stiffen the shock immediately in an on-demand manner.

A first hydraulic damper includes one end portion attached to a first attachment position of a vehicle body. A second hydraulic damper includes one end portion coupled to the other end portion of the first hydraulic damper via a linking member, and the other end portion attached to a second attachment position of the vehicle body. Each of the first and second hydraulic dampers includes a hydraulic cylinder, a piston, a piston rod, a free piston, a compression coil spring, first and second working oil passages to cause first and second oil chambers to communicate with each other, and working oil passage throttles. The first hydraulic damper, second hydraulic damper, and the linking member are coupled in the longitudinal direction. One of the hydraulic cylinder and piston rod is attached to the vehicle body, and the other is coupled to the linking rod.

An adjustable damping valve device has a first adjustable damping valve assembly for a first flow direction and a second adjustable damping valve assembly for a second flow direction. The two damping valve assemblies are adjustable independently from one another, and the first damping valve assembly generates a damping force for only one flow direction and the second damping valve assembly has a minimum cross section through which damping medium can flow in the setting for maximum damping force so that the second damping valve device generates a damping force in both flow directions.