5227results about "Vehicle springs" patented technology

The invention relates to systems that provide variable stiffness and / or variable damping using an electroactive polymer transducer. Systems described herein offer several techniques that provide variable and controlled stiffness and / or damping. A transducer may be implemented using open loop control, thereby providing simple systems that inactively deliver a desired stiffness and / or damping performance. Alternately, closed loop control techniques permit electroactive polymer transducer designs that actively adapt the stiffness and / or damping performance of a system. Further, transducers may be implemented in a device whose stiffness changes with deflection of the polymer.

A regenerative shock absorber that include a housing and a piston that moves at least partially through the housing when the shock is compressed or extended from a rest position. When the piston moves, hydraulic fluid is pressurized and drives a hydraulic motor. The hydraulic motor, in turn, drives an electric generator that produced electric energy. The electric energy may be provided to a vehicle, among other things. The regenerative shock absorber may also provide ride performance that comparable to or exceeds that of conventional shock absorbers.

Pressure-sensitive vales are incorporated within a dampening system to permit user-adjustable tuning of a shock absorber. In one embodiment, a pressure-sensitive valve includes an isolated gas chamber having a pressure therein that is settable by a user.

A mounting assembly for use with a mounting surface includes an arm, a pin, a pair of clamping blocks and a fastener. The arm has a cylindrical bore at one end. The pin extends through the bore. Each block of the pair of clamping blocks includes a central opening and is circumferentially discontinuous about the central opening. Each clamping block further includes a slot defined by portions of the block. The slot is dimensioned to allow the pin to pass through the slot when the block is in an unclamped position and to tightly grip the pin when the block is in a clamped position. The fasteners extend across the slots and are configured to engage the mounting surface to mount the blocks to the mounting surface.

An apparatus and its method of operation hydraulically convert the relative movements between a vehicle wheel and a body of the vehicle to electricity, and use the electricity to recharge a battery of the vehicle. A generator is provided on the vehicle and a hydraulic motor is provided on the vehicle to rotate an input shaft of the generator. A double acting piston and cylinder assembly is operatively connected to each wheel of the vehicle, and each double acting piston and cylinder assembly is connected through a hydraulic circuit to the hydraulic motor. Movements of the vehicle wheels during operation of the vehicle cause reciprocating movements of each piston in each double acting piston and cylinder assembly. The reciprocating movements of the pistons pump liquid to the hydraulic motor and draw liquid from the hydraulic motor to cause operation of the hydraulic motor. The operation of the hydraulic motor drives the generator input shaft, which in turn produces electricity that is supplied to the vehicle battery to recharge the vehicle battery.

An electromagnetic shock absorber including: (a) a wheel-side member; (b) a body-side member movable relative to the wheel-side member; and (c) a damping force generator with an electromagnetic motor including stationary and movable elements movable relative to each other. The damping force generator can generate, based on a force generated by the motor, a damping force acting against a relative movement of the wheel-side member and the body-side member. The motor has an axis extending in a both-members-relative-movement direction as a direction of the above-described relative movement. The stationary element is supported by the wheel-side member via an elastic body, to be movable relative to the wheel-side member in the both-members-relative-movement direction. The electromagnetic motor allows relative movement of the stationary element and the movable element upon movement of the stationary element relative to the wheel-side member.

A monotube shock absorber that can be adjusted remotely or otherwise, and a corresponding system are provided. The monotube shock absorber includes a body tube that houses a working piston therein and a bypass tube that is attached to but external with respect to the body tube. A control valve influences flow volume and rate of oil that passes through the bypass tube in a manner that correspondingly influences damping and / or other characteristics of the monotube shock absorber. The monotube shock absorber can include a floating piston separating a volume of gas from a volume of oil. The volumes of gas and oil may be entirely housed in the body tube or may be at least partially housed in an external reservoir that can include an anti-cavitation valve.

It is an object of the invention to improve the utility of an electromagnetic absorber system which is disposed in a suspension system of a vehicle and which generates a damping force by a generation force of a motor. The electromagnetic absorber system 18 is equipped with high-speed-motion responding means, thereby obviating an insufficiency of the damping force and a deterioration of the controllability in a high-speed stroke motion. More specifically, a hydraulic absorber 64 is provided in combination with the electromagnetic absorber system such that the hydraulic absorber 64 operates in the high-speed motion in which an electromotive force of the motor 68 exceeds a power source voltage Further, two motors having mutually different T-N characteristics are provided, and the two motors are selectively operated depending upon a stroke speed. Further, a variable resistor is interposed between the motor and the power source, and a resistance value of the variable resistor is increased in the high-speed motion to realize a decrease in a time constant of the motor, etc. Moreover, to cope with a large extent of unevenness of a road surface, an active stroke motion is performed by a drive force of the motor, thereby preventing the high-speed motion from being performed.

A system and method for controlling a damping system. The system has at least two dampers for damping between sprung and unsprung masses in the compression and rebound directions. Sensors generate signals based on position and other parameters of motion representative of the displacement between the sprung and unsprung masses. The process determines the appropriate compression and rebound forces to be applied at the wheels. A regulator responds to at least one of the independent compression and rebound control signals for adjusting, respectively, at least one of compression and rebound resisting forces of the dampers between the masses. Compliance for the dampers is emulated with software to produce the desired compliance forces. The distributed controller includes a processor that is responsive to signals representative of the position signals for forming the compression and rebound control signals for the regulator as a function of motion between the masses or a motion of a vehicle in which the dampers are located. The system has the capability of locking the suspension when parked.

A vehicle height adjustment suspension device provides for both automatic and selective raising and lowering of a supported portion of a vehicle frame relative a ground surface, while also providing shock absorption. The device includes a suspension assembly for absorbing shocks mounted on a rotatable threaded screw connected to a motor and extending into the suspension assembly. The assembly may be extended and retracted on the screw by rotating the screw in first and second directions to raise and lower the supported portion while the shock absorber assembly simultaneously provides shock absorption capability.

A spring carrier for mounting a spring strut to a vehicle body includes a vibration damper having a cylinder and a piston rod which is axially guided in the cylinder, first and second spring collars, and a spring located between the spring collars. An actuator includes a nut and a threaded spindle surrounding the piston rod, the actuator being driven to change the relative axial position of the spring collars. A guide tube extends coaxially between the piston rod and the threaded spindle, the guide tube being fixed to the vehicle body by a first resilient mount, the piston rod being fixed to the guide tube by a second resilient mount, whereby the piston rod can move relative to the first resilient mount.

A spring carrier for mounting a spring strut to a vehicle body includes a vibration damper having a cylinder and a piston rod which is axially guided in the cylinder, first and second spring collars, and a spring located between the spring collars. An actuator includes a nut and a threaded spindle surrounding the piston rod, the actuator being driven to change the relative axial position of the spring collars. A guide tube extends coaxially between the piston rod and the threaded spindle, the guide tube being fixed to the vehicle body by a first resilient mount, the piston rod being fixed to the guide tube by a second resilient mount, whereby the piston rod can move relative to the first resilient mount.

Spring support having at least one axially moveable spring plate, an actuator with a rotor producing a rotational movement relative to its stator, which is converted into an axial movement of the spring plate, and a torsional locking element which prevents torsional movement of the spring plate.

This disclosure relates to a suspension height adjustment mechanism comprising a main body, a rotatable assembly being rotatably mounted to the main body and having a first threaded portion, a tool engagement portion for rotating the rotatable assembly, a spring support having a second threaded portion engaging the first threaded portion, an anti-rotation means on the spring support adapted to cooperate with a corresponding anti-rotation means on the main body to prevent rotation of the spring support with respect to the main body, such that, in use, rotation of the tool engagement portion causes the spring support to axially translate along the rotatable assembly, thus adjusting the height of the suspension. This disclosure also relates to a vehicle suspension system comprising the suspension height adjustment mechanism and to a vehicle comprising the vehicle suspension system.

A wheelchair has a damping system to reduce the forward pitch of the wheelchair upon sudden deceleration or upon descent of a sloped surface. The damping system includes a clamp that selectively grips a shaft.

A magnetorheological fluid actuated damper. At least a first and a second cylinder with the first cylinder positioned axially within the second cylinder are provided. A gap is formed between the cylinders. The second cylinder is mounted to a stationary mount of the vehicle chassis and a control arm is mounted at an end of the first cylinder. The first cylinder is mounted on bearings to allow it to rotate relative to the chassis. The gap between the cylinders contains a magnetorheological fluid having an adjustable viscosity in reaction to the application of a magnetic field. A magnetic field is generated over the fluid in the gap.

A vehicle suspension spring system for a vehicle wheel station includes a hydraulic cylinder or strut having a piston which divides the cylinder volume into a main oil volume and an annular oil volume. The main oil volume communicates via a first oil passage with a first accumulator having a main gas volume. The annular oil volume communicates via a second oil passage with a second accumulator having an auxiliary gas volume. The oil in each accumulator is separated from the gas by a separator piston or diaphragm. A third oil passage with an isolating valve interconnects said first and second oil passages. Operation of the isolating valve is regulated by a controller. At least one sensor for sensing a parameter associated with vehicle attitude is connected to the controller. The controller is operable for switching the isolating valve between open and closed positions for altering spring stiffness of the strut in response to said sensed vehicle attitude parameter when the vehicle is in motion.

A method and apparatus for a fluid damper comprising a first fluid-filled chamber, a second chamber filled with a fluid having variable flow characteristics and at least partially displaceable by the first fluid, and a gas chamber, the gas chamber compressible due to the displacement of the second chamber. In one embodiment, the fluid in the second chamber is a variable rheology fluid.