Abstract: A work vehicle according to the present invention includes left and right axle cases of a rigid axle type, and left and right suspension mechanisms movable in the up-down direction relative to body frames and separately supporting the left and right axle cases, respectively. The work vehicle also includes (i) a first projection projecting downward from the left or right one of the body frames, (ii) a second projection projecting upward from that position on either the left and right axle cases or a frame body integrated with the axle cases which is opposite to the first projection in the left-right direction, and (iii) a lateral rod having a first end connected with the first projection and a second end connected with the second projection.

Abstract: A recreational off-highway vehicle includes a vehicle frame, at least one front wheel, a pair of rear wheels, a solid rear axle, a pair of trailing arms, a rear differential and a motor. The solid rear axle rotatably supports the rear wheels at its opposite ends. Each of the trailing arms is pivotally connected to the vehicle frame and the solid rear axle. A shock absorber is coupled between the vehicle frame and each of the trailing arms. The rear differential is supported on the solid rear axle and connected to the rear wheels. The transmission has a propeller shaft connected to the rear differential to drive the rear wheels. The motor is connected operatively to the transmission. The propeller shaft includes first and second drive sections that articulates relative to each other. The second drive section is connected to the rear differential.

Abstract: A trailing link multi-bar suspension assembly for a cycle having improved stability includes a first arm having a first arm fixed pivot and a first arm shock pivot. A shock link has a shock link fixed pivot and a shock link floating pivot. A shock absorber has an inline configuration, a gas spring, a first shock mount, and a second shock mount. A wheel carrier has a wheel carrier first pivot and a wheel carrier second pivot spaced apart from one another, and a wheel mount that is adapted to be connected to a wheel. A control link has a control link floating pivot and a control link fixed pivot, the control link floating pivot being pivotably connected to the wheel carrier second pivot, and the control link fixed pivot being pivotably connected to the first arm control pivot.

Abstract: A damper assembly includes an outer cylinder, an inner cylinder positioned at least partially within the outer cylinder, a plunger positioned at least partially within the inner cylinder and coupled to a rod, an aperture extending through the rod, an annular piston coupled to the inner cylinder, and a valve assembly. The rod is positioned at least partially within the inner cylinder and has an outer dimension that is smaller than an inner dimension of the inner cylinder. The plunger and an interior of the inner cylinder at least partially define a first chamber. The valve assembly is in fluid communication with the first chamber and a second chamber. The annular piston extends between the inner cylinder and the outer cylinder, and the annular piston, an exterior surface of the inner cylinder, and the outer cylinder at least partially define the second chamber.

Abstract: A trailing link multi-bar suspension assembly for a cycle having improved stability includes a first arm having a first arm fixed pivot and a first arm shock pivot. A shock link has a shock link fixed pivot and a shock link floating pivot. A shock absorber has a first shock mount and a second shock mount. A wheel carrier has a wheel carrier first pivot and a wheel carrier second pivot spaced apart from one another, and a wheel mount that is adapted to be connected to a wheel. A control link has a control link floating pivot and a control link fixed pivot, the control link floating pivot being pivotably connected to the wheel carrier second pivot, and the control link fixed pivot being pivotably connected to the first arm control pivot.

Abstract: A standing wheelchair device includes a wheeled base for enabling the device to move on a supporting surface. A harness assembly includes a plurality of braces for attaching to parts of a body of a user of the device, at least some adjacent braces of being connected by joints. A lifting unit mounted on the base, supports a hip joint of the harness assembly, and is configured to raise or lower the hip joint. When the user is attached to the harness assembly and is in a sitting position, raising a height of the hip joint causes the user to assume a standing position. When the when the user is attached to the harness assembly and is in a standing position, lowering the hip joint causes the user to assume a sitting or reclining position.

Abstract: A stage assembly (10) that moves a device (15) includes a stage (14) that retains the device (15), a base (12), a stage mover assembly (16), and a supply system (20A). The supply system (20A) is secured to and positioned on the stage (14). The supply system (20A) includes a circulation system (24) that circulates a circulation fluid (22) through a circulation conduit (14D) in the stage (14) to control the temperature of the stage (14) and the device (15).

Abstract: A wheelchair according to one embodiment includes a frame, a pair of drive wheels operatively coupled to the frame, a drive operatively coupled to each drive wheel, and a pair of anti-tip assemblies. Each anti-tip assembly includes a first member, a second member pivotally coupled to the first member at a joint that defines a pivot axis, an anti-tip wheel rotatably coupled to the second member, and a locking mechanism. The second member is capable of pivoting about the pivot axis between an extended position and a collapsed position. The locking mechanism is configured to selectively lock the second member in the extended position.

Abstract: A control arrangement for a hydropneumatic suspension system and a hydropneumatic suspension system are provided. The control arrangement has a pressure supply connection, a return connection, a piston chamber connection adapted to be connected to the piston chamber of a suspension cylinder of the hydropneumatic suspension system, an annular chamber connection adapted to be connected to the annular chamber of the suspension cylinder, and at least one controllable valve arrangement comprising a plurality of switch positions via which the pressure supply connection and the return connection are connectable to the piston chamber connection and the annular chamber connection. The annular chamber connection is in flow connection with the return connection via a pressure-limiting line having a hydraulically controllable pressure-limiting element. The pressure-limiting element has a control input adapted to be acted upon via a control line by a control pressure which is limitable to a predefinable pressure limit.

Abstract: A wheelchair including a chassis, two front suspension arms connected by a pivot link to the chassis and by a pivot link to a support assembly of a front wheel, two rear suspension arms connected by a pivot link to the chassis and by a pivot link to a support assembly of a rear wheel, and connecting means arranged to connect one of the front suspension arms to one of the rear suspension arms and to convert each rotational movement of the front suspension arm with respect to the chassis into a reverse rotational movement with respect to the chassis of the rear suspension arm to which it is connected by the connecting means, and vice versa.

Abstract: A device for suspending the cab of a vehicle includes a U-shaped main torsion bar (5) and a main actuator (3). The U-shaped main torsion bar (5) is positioned more or less along the longitudinal axis of the vehicle.

Abstract: Embodiments of a suspension for a vehicle is provided. The suspension includes, for example, a frame and a locking assembly. The locking assembly inhibits tipping of a frame of the vehicle when tipping of the frame is detected.

Abstract: A wheelchair suspension comprises a frame, at least one pivot arm, at least one front caster, at least one rear caster, a stabilizing system, and a sensor. The pivot arm is coupled to the frame. The front caster is coupled to the pivot arm. The rear caster is coupled to the frame. The stabilizing system is coupled to the frame and the pivot arm. The sensor is arranged such that tipping of the frame causes actuation of the stabilizing system to at least partially resist further movement of the frame.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame, at least one drive assembly and at least one caster pivot arm. The at least one drive assembly and the at least one caster pivot arm are pivotally connected to the frame at a common pivot axis such that the drive assembly and the front caster pivot arm are pivotable relative to one another.

Abstract: A shock absorber includes a hydraulic compression stop. The hydraulic stop includes a pressure tube surrounding the pressure tube of the shock absorber and a piston in hydraulic communication with the interior of the pressure tube. The piston can be disposed within the pressure tube and can be attached to the pressure tube or to the shock absorber. The hydraulic stop can also include a hydraulic fluid chamber and the piston can be disposed within the hydraulic fluid chamber.

Abstract: A wheelchair including a chassis, two front suspension arms connected by a pivot link to the chassis and by a pivot link to a support assembly of a front wheel, two rear suspension arms connected by a pivot link to the chassis and by a pivot link to a support assembly of a rear wheel, and connecting means arranged to connect one of the front suspension arms to one of the rear suspension arms and to convert each rotational movement of the front suspension arm with respect to the chassis into a reverse rotational movement with respect to the chassis of the rear suspension arm to which it is connected by the connecting means, and vice versa.

Abstract: A wheelie bar for leaf spring equipped cars includes first and second mounting brackets each having at least one attachment point and one bearing feature. First and second lower side members are pivotally mounted to the mounting brackets. A ground wheel is rotatably mounted to ends of the lower side members. First and second upper side members are pivotally mounted to the mounting brackets and fixedly attached to the lower side members. A vehicle bearing wheel is rotatably mounted to opposite ends of the first and second upper side members. Bearings are provided. A rear support member connects the upper side members and distal ends of the lower side members. At least one elevating facility urges the first and second lower side members upwardly toward an underside of a car. The attachment points have arcuate front ends and are fixedly attached to an axle housing of the car by welding.

Abstract: A device for suspending the cab of a vehicle includes a U-shaped main torsion bar (5) and a main actuator (3). The U-shaped main torsion bar (5) is positioned more or less along the longitudinal axis of the vehicle.

Abstract: A traveling apparatus performs an inverted pendulum control to maintain an inverted state of a vehicle body and travels with a passenger thereon. The traveling apparatus includes a drive portion that drives the vehicle body; a riding detection portion that detects a start of riding on the vehicle body by the passenger; a command generation portion that generates a torque command value to perform the inverted pendulum control and a position control to move the vehicle body to a position that facilitates the riding, when the start of riding is detected by the riding detection portion; and a control portion that controls the drive portion based on the torque command value generated by the command generation portion.

Abstract: A motor vehicle includes a rear suspension equipped with at least one shock absorber including a by-pass passage for bringing about a damping effect that is different in different portions of the stroke of the plunger of the shock absorber. The shock absorber and the by-pass passage are configured in such a way that the shock absorber produces a maximum damping effect in a final stretch of the stroke of the plunger in the direction of lengthening of the shock absorber, said final stretch of stroke being pre-arranged so as to correspond to the final part of the maximum possible lift of said rear suspension during braking of the motor vehicle.

Abstract: A damping and stiffness system for a vehicle suspension system including at least two forward and two rearward wheel assemblies each associated with vehicle resilient support means (27-30) between a vehicle body and the wheel assemblies. The damping and stiffness system including: a wheel ram (11-14) with at least a compression chamber (45-48) between each wheel assembly and the vehicle body and a load distribution unit (76). The load distribution unit (76) includes two pairs of chambers (77-80), each chamber (77-80) being divided into front (89, 90) and back (91, 92) system chambers (which vary in volume proportionally and in opposite senses therein with piston motion) and the remaining pitch chambers (93-96) by interconnected pistons (81-84) supported therein. The compression chamber (45-48) of each wheel ram (11-14) is in fluid communication with a respective system chamber (89-92) wherein the vehicle is primarily supported by the vehicle resilient support means (27-30).

Abstract: A wheelchair suspension comprises a frame, at least one pivot arm, at least one front caster, at least one rear caster, a stabilizing system, and a sensor. The pivot arm is coupled to the frame. The front caster is coupled to the pivot arm. The rear caster is coupled to the frame. The stabilizing system is coupled to the frame and the pivot arm. The sensor is arranged such that movement of the frame relative to the rear castor causes actuation of the stabilizing system to at least partially resist further movement of the frame.

Abstract: A wheelchair suspension includes a frame, a drive assembly pivot arm, a drive assembly, a front caster pivot arm, a front caster, and a spring and shock absorbing assembly. The drive assembly pivot arm is pivotally connected to the frame. The drive assembly includes a drive wheel and is mounted to the drive assembly pivot arm. The front caster pivot arm is pivotally mounted to the frame and coupled to the drive assembly pivot arm. The front caster is coupled to the at least one front caster pivot arm. The spring and shock absorbing assembly is pivotally connected to the drive assembly pivot arm at a first pivotal connection and pivotally connected to the front caster pivot arm at a second pivotal connection. The first and second pivotal connections are positioned such that a majority of the force applied by the spring and shock absorbing assembly is applied to the drive wheel when the suspension is on a flat, horizontal support surface.

Abstract: A motor vehicle includes a rear suspension equipped with at least one shock absorber including a by-pass passage for bringing about a damping effect that is different in different portions of the stroke of the plunger of the shock absorber. The shock absorber and the by-pass passage are configured in such a way that the shock absorber produces a maximum damping effect in a final stretch of the stroke of the plunger in the direction of lengthening of the shock absorber, said final stretch of stroke being pre-arranged so as to correspond to the final part of the maximum possible lift of said rear suspension during braking of the motor vehicle.

Abstract: An improved traction device for a motor vehicle provides a rear support assembly positioned proximate to a rear axle and an adjacent portion of a leaf spring and a front rocker support assembly. The front rocker support assembly includes a front leaf spring bracket assembly attached to a selected portion of the leaf spring between the axle and the front leaf spring mount, a rocker pivotally attached to the front leaf spring bracket assembly, and a rocker head connected to an end of the rocker for engaging a lower surface of the leaf spring to limit pivotal movement of the front rocker support assembly relative to the front end of the leaf spring, and. An adjustable rigid link extends between the rear support assembly and the front rocker support assembly.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame, at least one drive assembly and at least one caster pivot arm. The at least one drive assembly and the at least one caster pivot arm are coupled to enhance the vehicle's ability to traverse obstacles.

Abstract: Provided is a structure of a roll rod for a vehicle which is mounted on a subframe of the vehicle and combined with a transmission or an engine. The structure includes a fastening rod having one end connected with the transmission or the engine and the other end where a sliding portion is inserted in the subframe, a mounting member fixed to the subframe in contact with the outer circumference of the sliding portion and having a protrusion on the inner circumference, a front insulator connected to the outer circumference of the sliding portion and positioned ahead of the protrusions, a rear insulator connected to the outer circumference of the sliding portion and positioned behind the protrusion, and an end plate mounted on the fastening rod, behind the rear insulator, in which the rear insulator is formed by combining two or more sub-insulators and one or more sub-insulators are spaced apart from the end plate.

Abstract: A combination of existing suspension designs is provided to suspend moving vehicles such as cars, trucks, planes, and snowmobiles and provide two degrees of freedom in the wheels or skis. The design combines a dive suspension with a roll suspension, including a locking linkage. The locking linkage locks out the roll suspension during dive, jounce, flight or two-wheel bump motion. Both the dive and roll suspensions are responsive during roll motion and one-wheel bump motion.

Abstract: A wheel suspension system having under powered acceleration a squat response that begins in the realm of anti squat and passes through a point of lessened anti squat at a further point in the travel.

Abstract: A suspension system for a motor vehicle that controls torque reaction comprising a chassis, a rigid drive axle, an opposite axle, a road wheel attached to each end of each axle, at least one torque reaction control link positioned longitudinally of the motor vehicle between the road wheels, at least two longitudinal control arms attached proximate the road wheels, for longitudinal control of the drive axle, so that the at least one torque reaction control link has a longitudinal plane that extends longitudinally of the motor vehicle and whereby the effective projection lines of the at least two longitudinal control arms and the longitudinal plane of the at least one torque reaction control link intersect each other in the direction of the opposite axle, forming a convergent angle and that when a force moves the rigid drive axle vertically up the convergent angle does not increase.

Abstract: A four-wheel vehicle is provided with an in-wheel motor in each of a front wheel and a rear wheel and has approximately the same roll center heights of the front wheel and the rear wheel. The relation between a change in a kingpin offset and a change in a wheel stroke for at least any one of the front wheel and the rear wheel of the four-wheel vehicle is determined based on at least any one of braking force distribution and driving force distribution between the front wheel and the rear wheel.

Abstract: A ride control system for a motorcycle having an oil-containing fork having an air space. The control system includes a control unit having a reservoir and a valve in flow communication with the air space of the fork and the reservoir. The valve is configured to enable air to substantially freely pass from the air space of the fork to the reservoir during a relatively low speed impact experienced by the fork, and to inhibit air from passing from the fork to the reservoir during a relatively high speed impact.

Abstract: Four shock absorbers are connected to a control cylinder. The control cylinder includes a housing body portion having two cylinder chambers which are divided by a partition wall portion; and a piston assembly which is formed by coupling two pistons with each other using a coupling rod. Two outer side control chambers and two inner side control chambers are connected to respective absorber chambers. Pressure receiving areas of outer side pressure-receiving surfaces and inner side pressure-receiving surfaces of the pistons and damping characteristics of the shock absorbers are set such that a direction in which the piston assembly moves in a region where an operation speed is low is opposite to a direction in which the piston assembly moves in a region where the operation speed is high.

Abstract: A stabilizing apparatus and method that replaces the existing shock absorber of a road vehicle that works to resist the initiation of body roll during cornering. It seeks to counter act the forces being generated by the vehicle suspension springs that exacerbate the rollover propensity of vehicles during certain steering maneuvers.

Abstract: A suspension system for a motor vehicle that controls torque reaction comprising a chassis a rigid drive axle, an opposite axle, a road wheel attached to each end of each axle, at least one torque reaction control link positioned longitudinally of the motor vehicle between the road wheels, at least two longitudinal control arms attached proximate the road wheels, for longitudinal control of the drive axle, so that the at least one torque reaction control link has a longitudinal plane that extends longitudinally of the motor vehicle and whereby the effective projection lines of the at least two longitudinal control arms and the longitudinal plane of the at least one torque reaction control link intersect each other in the direction of the opposite axle, forming a convergent angle and that when a force moves the rigid drive axle vertically up the convergent angle does not increase.

Abstract: A suspension assembly includes at least one leaf spring with first and second spring ends that are adapted for mounting to forward and rearward vehicle frame portions, respectively. A center portion of the leaf spring is clamped to an axle beam with a clamp. The suspension assembly includes a brake torque reactor that has one end mounted to the center portion of the leaf spring at the axle beam and an opposite end that cooperates with only one of the first and second spring ends to provide resistance for the leaf spring from deforming due to wind up generated during braking applications.

Abstract: A suspension system for a motor vehicle comprising a chassis, a rigid drive axle, an opposite axle and road wheels attached to the ends of each axle, a torque reaction control link positioned longitudinally of the motor vehicle with longitudinal control arms pivotally attached to the rigid drive axle, for controlling torque reaction of the rigid drive axle, in combination with the torque reaction control link. The torque reaction control Link has a longitudinal plane that extends longitudinally of the motor vehicle and whereby the effective projection lines of the longitudinal control arms and the longitudinal plane of the torque reaction control link Intersect each other forming a convergent angle at an instant center located closer to the opposite axle than to the rigid drive axle and that when a force moves the rigid drive axle vertically up the convergent angle does not increase.

Abstract: A personal ability vehicle (PMV) includes a frame with front and rear subframes. A steering mechanism is mounted on the front subframe and includes a steering front wheel connected to a tiller. The rear subframe includes a suspension mount comprising a pair of rear support legs. An anti-tip suspension includes a pair of trailing arms each mounting a trailing wheel. Each trailing arm is pivotally mounted on a respective support leg whereby the suspension is inevitable through a limited range of motion about a transverse suspension pivotal axis. A pair of spring assemblies are attached to the trailing arms and are adapted for selectively engaging the support legs to provide a counter-rotational torque force around the suspension pivotal axis in order to resist backwards tipping of the PMV, for example, when it is ascending an inclined sloping surface. Relatively uniform proportional, weight distribution on said steering front, main and trailing wheels is maintained throughout a range of loads.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame and a releasable locking assembly. The releasable locking assembly has, for example, a first assembly movably coupled to the frame, a second assembly movably coupled to the frame, and wherein movement of the frame relative to the first and second assemblies causes the first and second assemblies to engage each other to limit further movement of the frame in at least a first direction.

Abstract: A wheeled vehicle has a front suspension unit coupled with a body frame to suspend a front wheel. The front suspension unit allows the front wheel to move relative to the body frame. The front suspension unit has a pair of front suspension members coupled with each other. A rear suspension unit is coupled with the body frame to suspend a rear wheel. The rear suspension unit allows the rear wheel to move relative to the body frame. A hydraulic system inhibits a position of the body frame from changing relative to the ground. The hydraulic system has a first hydraulic device to generate hydraulic pressure in response to the movement of the front wheel relative to the body frame. A second hydraulic device generates hydraulic pressure in response to the movement of the rear wheel relative to the body frame. A hydraulic pressure adjusting device connects the first and second hydraulic devices with each other.

Abstract: A jointed mechanism of an electric wheelchair is disclosed. The jointed mechanism includes symmetrically arranged front caster assemblies, symmetrically arranged rear caster assemblies, drive wheel assemblies, and a main chassis assembly. The front caster assemblies are bushed to the main chassis assembly and the rear caster assemblies respectively. The rear caster assemblies are fixed to the drive wheel assemblies by pivot arm plate assemblies and bushed to the main chassis assembly and the rear caster assemblies to construct a four-bar linkage, which allows the electric wheelchair to always have contact with the ground with all wheels and to adjust the center of gravity to maintain balance automatically, even when the electric wheelchair is climbing a slope or moving on an uneven surface.

Abstract: A tilting suspension system is provided for a vehicle comprising at least a first and a second wheel (2,3) disposed on a common axle, the module comprising a suspension system adapted to support the at least first and second wheels allowing both tilting and vertical displacement of the at least first and second wheels, said module comprising tilting means (14) pivotally connected to the suspension system, so that tilting of the tilting means results in the suspension system being tilted together with the at least first and second wheels, the tilting means being connected to the suspension system through first and second shock absorbing means, so that a vertical displacement of one or both of the first or second wheels (2, 3) results in a force being exerted on one or both of the first and second wheels, respectively, varying in a non-linear manner as a function of the vertical displacement of the at least first and second wheels.

Abstract: A vehicle suspension system of a motor vehicle includes a plurality of suspension devices mounted on the vehicle with respect to right and left wheels of the vehicle, respectively, a first behavior controller that controls the motion of each of the suspension devices when a vehicle body undergoes a first behavior, and a second behavior controller that controls the motion of each of the suspension devices when the vehicle body undergoes a second behavior, independently of the first behavior controller.

Abstract: Vehicle suspension system applicable to vehicles provided with rolling arrangements that have a resistance to the roll, pitch vertical rebound, and axle crossing movement such that allows a weight distribution on every rolling arrangement. The rolling arrangements are connected to a central device that is attached to the vehicle body. The central device includes elastic devices that receive the movements and forces originated in each rolling arrangement because of the weight variations and dynamic forces created when the vehicle is traveling. Vertical forces and movements detected in the vehicle wheels are transmitted to the central device through hydraulic and/or mechanical devices.

Abstract: A suspension system is disclosed which controls the movement of a wheel carrier relative to the body of a vehicle. The suspension system includes one or more links (10, 20, 30, 40) connected at one end to the wheel carrier and at the other end to the vehicle body as to define a linkage. The linkage is so constructed and arranged that the stiffness or reaction of the suspension to longitudinal forces applied at the wheel contact patch is greater than the stiffness or reaction of the suspension to longitudinal forces applied substantially at the axis of rotation of the wheel.

Abstract: A safely assistant wheel structure of a power-driven wheelchair having a body under which a front wheel and a rear wheel are provided, in which a front end of the front wheel is provided with an assistant wheel of which an axle center is provided for a holder to stretch through above which a fixed link is provided stretching from the body, and a shock absorber spring is provided between the holder and the fixed link, when the forward moving power-driven wheelchair is suddenly braked, an inertial, a forward leaning force of the body is eliminated by the assistant wheel and detracted by the spring for the stability of wheelchair body and the safe ride of a rider.

Abstract: A suspension for a vehicle is provided. The suspension includes, for example, a frame and a releasable locking assembly. The releasable locking assembly has, for example, a first assembly movably coupled to the frame, a second assembly movably coupled to the frame, and wherein movement of the frame relative to the first and second assemblies causes the first and second assemblies to engage each other to limit further movement of the frame in at least a first direction.

Abstract: A wheeled conveyance comprising a chassis (4), support means for a load mounted on the chassis (4), a suspension assembly mounted on the chassis (4), and at least one shock absorber means (38) acting on at least part of the suspension assembly and adapted and arranged to limit tilting of the chassis (4) relative to at least part of the suspension assembly under dynamic load conditions tending to produce such tilting. The suspension assembly comprises spring means (32) and suspension arms pivotably mounted on the chassis (4) and extending in forward and rearward directions in the region of opposite sides of the chassis (4). Each suspension arm has a wheel (16, 26) rotatably mounted at the free end.

Abstract: A rotary force when applied to an axle causes the wheel (10) to turn but the vehicle itself reacts to this rotation with an equal and opposite force and rotates the vehicle in the opposite direction lifting the front of the vehicle when accelerating forward. A reactive arm (13) is fitted to the driving axle in a manner where it can use this reaction to the rotary force and redirect this force to a point on the chassis (18) where this force can be used to counteract the effects of this rotary force and of weight transfer caused by acceleration of the chassis.

Abstract: A ride control system for a motorcycle having an oil-containing fork having an air space. The control system includes a control unit having a reservoir and a valve in flow communication with the air space of the fork and the reservoir. The valve is configured to enable air to substantially freely pass from the air space of the fork to the reservoir during a relatively low speed impact experienced by the fork, and to inhibit air from passing from the fork to the reservoir during a relatively high speed impact.