A valve assembly for a vehicle suspension system includes a valve body, a first flow controller, a first plunger, a second flow controller, and a second plunger. The valve body defines a first inlet port, a first outlet port, a first chamber connected to the first inlet port and the first outlet port, a second chamber, a second inlet port, a second outlet port, a third chamber connected to the second inlet port and the second outlet port, and a fourth chamber. The first flow controller is positioned within the first chamber. The first plunger is positioned between the first chamber and the second chamber. The second flow controller is positioned within the third chamber. The second plunger is positioned between the third chamber and the fourth chamber.

A suspension apparatus includes: a damping device which damps a force generated between a vehicle body and a wheel; and a control section which controls a damping force of the damping device. The control section includes a multiplication section which multiplies a longitudinal acceleration of the vehicle body detected by a longitudinal acceleration sensor and a differential value of the longitudinal acceleration to thereby obtain a multiplication value.

Methods and apparatus for position sensitive dampening with an active valve. In one aspect a fluid damper is provided comprising a damper chamber divided by a piston into a primary compression and a primary rebound chamber; a secondary compression chamber in fluid communication with the damper chamber; and an active valve controlling fluid flow out of the secondary compression chamber.

A hydraulic vibration damper, in particular for a vehicle chassis, includes a cylinder tube for receiving a hydraulic fluid. A piston is axially movable within the cylinder tube along a cylinder tube axis and subdivides the cylinder tube into two working chambers. A piston rod is oriented parallel to the cylinder tube axis and is connected to the piston. At least one valve assembly for damping the piston movement in a direction of actuation is arranged at a fluid leadthrough. A bypass duct includes a sub-duct provided in addition to the fluid leadthrough between the two working chambers. A valve arrangement with continuously adjustable damping force is provided which regulates the throughflow through the fluid leadthrough and the sub-duct. The sub-duct includes a throttling mechanism, having a throttle, and a non-return valve. The throttle and the non-return valve of the sub-duct are arranged in series.

[Problem] The present invention provides a damping force adjustable shock absorber capable of reducing manufacturing cost.

[Means for Solving] A shock absorber 1 is configured in such a manner that a main valve 32 is disposed below a piston valve 5, and a sub valve 68 for variably adjusting a set load of the main valve 32 is provided in a piston case 21 above the piston valve 5, with a first valve body 53 of the sub valve 68 slidably sealed to a case member 60 by a metal seal at only one portion. Due to the configuration, the shock absorber 1 can ease precision of components of the sub valve 68, thereby reducing the manufacturing cost.

A control apparatus for a suspension apparatus includes: an acquisition section which acquires a stroke amount of the suspension apparatus disposed between a vehicle body and a wheel to damp vibration propagated from the wheel; a calculation section which calculates a stroke velocity based on the stroke amount; and a damping force control section which controls damping force of the suspension apparatus based on the stroke velocity. The calculation section includes a first calculation section which differentiates the stroke amount by use of a first time constant as a time constant, to thereby calculate a first stroke velocity, and a second calculation section which differentiates the stroke amount by use of a second time constant larger than the first time constant as a time constant, to thereby calculate a second stroke velocity, and calculates the stroke velocity based on the first stroke velocity and the second stroke velocity.

Some examples include a damper having an outer tube with a piston reciprocally mounted on an interior of the outer tube. A dampening force generating mechanism may be mounted on the outer tube within a threshold distance from a first end of the outer tube to control a dampening property of the piston. In addition, a vehicle interface adapter may seal the first end of the outer tube. The vehicle interface adapter may include an insertion portion extending outward from the first end of the outer tube. The insertion portion is able to be inserted into a cup-shaped portion of a vehicle attachment receptacle.

A frequency-sensitive shock absorber according to an embodiment of the present disclosure includes a valve assembly configured to generate a damping force that varies depending on a magnitude of a frequency, in which the valve assembly includes a main retainer having a main chamber configured to communicate with an injection flow path formed in a piston rod or a body pin, a main valve configured to open or close the main chamber, a housing having a pilot chamber having one side facing the main valve and the other side communicating with the injection flow path, and a pilot valve configured to cover the pilot chamber and press the housing toward the main valve while being elastically deformed when pressure in the pilot chamber is higher than a preset pressure.

A shock absorber for a suspension system of a vehicle includes an intermediate tube on an inner tube defining an intermediate chamber between the inner tube and the intermediate tube. The shock absorber includes an outer tube and the inner tube and the intermediate tube are in the outer tube. The outer tube defines a reserve chamber between the outer tube and the intermediate tube. A valve fluidly connects the intermediate chamber and the reserve chamber. An elongated slot is in the outer tube between the valve and the reserve chamber.

Suspension systems for recreational vehicles are disclosed. The suspension systems may include at least one adjustable member coupling a sway bar to respective suspensions. The suspension systems may include a torque actuator associated with a sway bar.