US20020113393A1 - Anti-roll bar with link actuator for controlling torsional rigitidy - Google Patents
Anti-roll bar with link actuator for controlling torsional rigitidy Download PDFInfo
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- US20020113393A1 US20020113393A1 US09/788,080 US78808001A US2002113393A1 US 20020113393 A1 US20020113393 A1 US 20020113393A1 US 78808001 A US78808001 A US 78808001A US 2002113393 A1 US2002113393 A1 US 2002113393A1
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- piston
- cylinder
- plate
- piston rod
- roll bar
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
- F16F9/46—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction allowing control from a distance, i.e. location of means for control input being remote from site of valves, e.g. on damper external wall
- F16F9/466—Throttling control, i.e. regulation of flow passage geometry
- F16F9/467—Throttling control, i.e. regulation of flow passage geometry using rotary valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
- B60G17/016—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input
- B60G17/0162—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by their responsiveness, when the vehicle is travelling, to specific motion, a specific condition, or driver input mainly during a motion involving steering operation, e.g. cornering, overtaking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
- B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
- B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
- B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
- B60G21/055—Stabiliser bars
- B60G21/0551—Mounting means therefor
- B60G21/0553—Mounting means therefor adjustable
- B60G21/0558—Mounting means therefor adjustable including means varying the stiffness of the stabiliser
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2200/00—Indexing codes relating to suspension types
- B60G2200/30—Rigid axle suspensions
- B60G2200/34—Stabilising mechanisms, e.g. for lateral stability
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/10—Type of spring
- B60G2202/13—Torsion spring
- B60G2202/135—Stabiliser bar and/or tube
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/20—Type of damper
- B60G2202/24—Fluid damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
- B60G2202/30—Spring/Damper and/or actuator Units
- B60G2202/32—The spring being in series with the damper and/or actuator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/12—Mounting of springs or dampers
- B60G2204/122—Mounting of torsion springs
- B60G2204/1224—End mounts of stabiliser on wheel suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/62—Adjustable continuously, e.g. during driving
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/10—Acceleration; Deceleration
- B60G2400/104—Acceleration; Deceleration lateral or transversal with regard to vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/20—Speed
- B60G2400/204—Vehicle speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
- B60G2400/40—Steering conditions
- B60G2400/41—Steering angle
- B60G2400/412—Steering angle of steering wheel or column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
- B60G2500/104—Damping action or damper continuous
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
- B60G2500/11—Damping valves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
- B60G2800/01—Attitude or posture control
- B60G2800/012—Rolling condition
Definitions
- the present invention relates to an apparatus for use in a vehicle suspension and, more particularly, to an apparatus for use in helping to resist vehicle roll during a turn.
- Anti-roll bars also known as sway bars, are used in vehicle suspensions for helping to resist vehicle roll during a turn. Anti-roll bars may be used in both the front and rear suspensions of a vehicle.
- Anti-roll bars are generally U-shaped and include opposite first and second end portions and an intermediate portion.
- the first end portion is fixed to the right-hand side of the vehicle suspension and the second end portion is fixed to the left-hand side of the vehicle suspension.
- the first end portion and the second end portion of the anti-roll bar move relative to one another.
- the intermediate portion of the anti-roll bar may be subjected to a torsional force.
- the torsional stiffness, i.e., the resistance to the torsional force, of the intermediate portion of the anti-roll bar helps to resist vehicle roll during the turn.
- the stiffness of the anti-roll bar is also known to increase the spring rate of the vehicle suspension.
- the independence of the right-hand side and the left-hand side of the vehicle suspension may be affected by connecting the two sides with the anti-roll bar. Consequently, the vehicle ride may be affected, especially when the vehicle is traveling in a linear direction.
- Known systems have attached at least one end portion of the anti-roll bar to the vehicle suspension with an actuator.
- the actuator includes a cylinder and a piston that is movable within the cylinder.
- the piston divides the cylinder into two variable volume chambers.
- the known systems further include a source of fluid and a control valve, both of which are independent of the actuator.
- the control valve is connected to each chamber of the piston by a hydraulic conduit.
- the control valve has three positions. In a first position, the control valve interconnects the hydraulic conduit connected to each chamber of the actuator, thereby allowing unrestricted movement of the piston in the cylinder. In a second position, the control valve sends hydraulic fluid to the first chamber and receives hydraulic fluid flowing out of the second chamber. In a third position, the control valve sends hydraulic fluid to the second chamber and receives hydraulic fluid flowing out of the first chamber.
- a system similar to that described above is disclosed in U.S. Pat. No. 5,529,324.
- the known system helps to reduce the possible effects of the anti-roll bar on the spring rate of the vehicle, the known system includes many parts and installation of the known systems on a vehicle is complex.
- This invention is an apparatus for use in a vehicle suspension.
- the apparatus comprises an anti-roll bar having opposite first and second end portions. An intermediate portion is interposed between the first and second end portions and is subjected to torsional forces when the first and second end portions move relative to one another.
- the apparatus further comprises an actuator for attaching at least one of the first and second end portions to a part of the vehicle suspension.
- the actuator comprises a cylinder for retaining fluid and a piston assembly for dividing the cylinder into two chambers.
- the piston assembly is movable within the cylinder.
- the piston assembly includes structure forming orifices for interconnecting the two chambers of the cylinder. A fluid flow area of the orifices is adjustable to vary a resistance to relative movement of the first and second end portions of the anti-roll bar.
- FIG. 1 is a schematic view of a portion of a vehicle suspension including an apparatus constructed in accordance with the present invention
- FIG. 2 is a schematic view of an actuator of the apparatus of the present invention
- FIG. 3 is a view taken along line 3 - 3 in FIG. 2;
- FIGS. 4 ( a )- 4 ( c ) are schematic views of a portion of the actuator of FIG. 3 illustrating a change in the flow area of orifices in the actuator.
- FIG. 5 illustrates a second embodiment of an actuator of the apparatus of the present invention.
- FIG. 1 schematically illustrates a portion of a vehicle suspension 10 including an apparatus 12 of the present invention.
- the suspension 10 includes a left-hand side 14 and a right-hand side 16 .
- a first steerable wheel 18 is connected to the left-hand side 14 of the suspension 10 and a second steerable wheel 20 is connected to the right-hand side 16 of the suspension 10 .
- the left-hand side 14 of the suspension 10 includes a first control arm 22 and the right-hand side 16 of the suspension 10 includes a second control arm 24 . Both the first and second control arms 22 and 24 are U-shaped. Steerable wheel 18 connects with a closed portion 26 of the U-shape of control arm 22 . Steerable wheel 20 connects with a closed portion 27 of the U-shape of control arm 24 .
- the apparatus 12 of the present invention includes an anti-roll bar 28 .
- the anti-roll bar 28 includes opposite first and second end portions 30 and 32 , respectively.
- An intermediate portion 34 is interposed between the respective end portions 30 and 32 .
- the anti-roll bar 28 has a generally U-shaped configuration with the first and second end portions 30 and 32 forming two legs of the U-shape and the intermediate portion 34 forming a closed end of the U-shape.
- the intermediate portion 34 of the anti-roll bar 28 extends linearly.
- the intermediate portion 34 has a length that is approximately eighty percent of the total length of the anti-roll bar 28 .
- the total length of the anti-roll bar 28 is the length from a terminal end 36 of the first end portion 30 to a terminal end 38 of the second end portion 32 .
- Brackets 40 and 42 support the intermediate portion 34 of the anti-roll bar 28 .
- the brackets 40 and 42 attach to the vehicle frame (not shown) in a known manner and allow the intermediate portion 34 of the anti-roll bar 28 to freely rotate about an axis A passing through the center of the intermediate portion 34 of the anti-roll bar 28 .
- the first end portion 30 of the anti-roll bar 28 extends from the left-hand end 44 of the intermediate portion 34 of the anti-roll bar 28 .
- the first end portion 30 extends from the intermediate portion 34 at an angle of approximately forty-five degrees relative to axis A and has a length that is approximately one-tenth of the total length of the anti-roll bar 28 .
- the first end portion 30 terminates at terminal end 36 .
- the second end portion 32 of the anti-roll bar 28 is a mirror image of the first end portion 30 .
- the second end portion 32 extends from a right-hand end 46 of the intermediate portion 34 of the anti-roll bar 28 .
- the second end portion 32 extends from the intermediate portion 34 at an angle of approximately forty-five degrees relative to axis A and has a length that is approximately one-tenth of the total length of the anti-roll bar 28 .
- the second end portion 32 is within the same plane as the first end portion 30 .
- the second end portion 32 terminates at terminal end 38 .
- the apparatus 12 further includes an actuator 48 .
- the actuator 48 attaches the first end portion 30 of the anti-roll bar 28 to the first control arm 22 of the vehicle suspension 10 .
- a detailed description of the actuator 48 is found below.
- a link member 50 attaches the second end portion 32 of the anti-roll bar 28 to the second control arm 24 of the vehicle suspension 10 .
- the link member 50 is a solid steel rod that extends between the second control arm 24 and the second end portion 32 of the anti-roll bar 28 .
- FIGS. 2 and 3 illustrate the actuator 48 of the apparatus 12 of the present invention.
- the actuator 48 includes a cylinder 52 for retaining a fluid 54 and a piston assembly 56 .
- Description of the actuator 48 will be made with reference to axis B.
- axis A represents a generally horizontal axis; whereas, axis B represents a generally vertical axis.
- the cylinder 52 includes an axially extending, cylindrical main body portion 58 .
- the cylindrical main body portion 58 is centered on axis B.
- the main body portion 58 of the cylinder 52 includes an outer wall 60 and an inner wall 62 .
- First and second axial ends 64 and 66 close axially opposite ends of the main body portion 58 of the cylinder 52 .
- the first axial end 64 of the cylinder 52 is annular and includes an opening 68 that is centered on axis B. As illustrated in FIG. 3, the opening 68 has a diameter of approximately fifty percent of the inner diameter of the main body portion 58 of the cylinder 52 .
- the second axial end 66 of the cylinder 52 is domed and completely closes the cylinder 52 .
- a first mounting member 70 for attaching the cylinder 52 to the first control arm 22 extends from the center of the second axial end 66 of the cylinder 52 in a direction axially opposite the main body portion 58 of the cylinder 52 .
- the first mounting member 70 illustrated in FIGS. 2 and 3 includes a cylindrical rod 72 and a first tubular bushing 74 .
- the cylindrical rod 72 is centered on axis B.
- One end of the cylindrical rod 72 is fixed to the second axial end 66 of the cylinder 52 and the other end of the cylindrical rod 72 is fixed to an outer surface 76 (FIG. 3) of the first tubular bushing 74 .
- the first tubular bushing 74 includes a channel 78 that extends in a direction perpendicular to axis B. As shown in FIG. 1, a part of the first control arm 22 extends through the channel 78 of tubular bushing 74 .
- a fastener (not shown) fixes the first tubular bushing 74 to the first control arm 22 .
- the piston assembly 56 of the actuator 48 includes a piston 80 (FIG. 3) formed by first and second plates 82 and 84 , respectively.
- the piston 80 is enclosed within the cylinder 52 and is movable within the cylinder 52 along axis B.
- the piston 80 divides the cylinder 52 into two variable volume chambers 81 and
- the first plate 82 forming the piston 80 is flat and circular.
- the first plate 82 is centered on axis B and extends radially outwardly to engage the inner wall 62 of the main body portion 58 of the cylinder 52 .
- the first plate 82 has an upper surface 86 and a lower surface 88 .
- the upper surface 86 of the first plate 82 is nearest the first axial end 64 of the cylinder 52 and the lower surface 88 is nearest the second axial end 66 of the cylinder 52 .
- An annular ring (not shown) may extend circumferentially around the first plate 82 for sealing the first plate 82 against the inner wall 62 of the cylinder 52 .
- An opening 90 extends axially through the first plate 82 .
- the opening 90 is centered on axis B and in the illustrated embodiment has a diameter of approximately twenty-five percent of the diameter of the first plate 82 .
- the size of the opening 90 may be varied.
- the first plate 82 of the piston 80 further includes a plurality of axially extending passages 92 .
- the axially extending passages 92 are arranged in a circular array about axis B.
- the first plate 82 has six axially extending passages 92 , two of which are shown in FIG. 3.
- annular groove 94 extends into the lower surface 88 of the first plate 82 in an area between the central opening 90 and the axially extending passages 92 .
- the annular groove 94 completely surrounds the central opening 90 .
- the annular groove 94 has a rectangular cross-sectional profile for receiving a portion of an o-ring 96 .
- the second plate 84 forming the piston 80 is also flat and circular.
- the second plate 84 is centered on axis B. As illustrated in FIG. 3, the second plate 84 also extends radially outwardly to engage the inner wall 62 of the main body portion 58 of the cylinder 52 .
- the second plate 84 may have a diameter that differs from the diameter of the first plate 82 .
- the second plate 84 has an upper surface 98 and a lower surface 100 .
- the upper surface 98 of the second plate 84 engages the lower surface 88 of the first plate 82 .
- the lower surface 100 of the second plate 84 is nearest the second axial end 66 of the cylinder 52 .
- the second plate 84 of the piston 80 also includes a plurality of axially extending passages 102 arranged in a circular array about axis B.
- the second plate has six axially extending passages 102 , as shown in FIGS. 4 ( a )-( c ).
- the axially extending passages 102 of the second plate 84 may be aligned, depending upon rotation of the second plate 84 relative to the first plate 82 , with the axially extending passages 92 of the first plate 82 of the piston 80 .
- annular groove 104 extends into the upper surface 98 of the second plate 84 in an area corresponding to the annular groove 94 in the first plate 82 .
- the annular groove 104 in the second plate 84 has a rectangular cross-sectional profile for receiving a portion of o-ring 96 .
- the piston assembly 56 further includes first and second piston rods 106 and 108 , respectively.
- the first piston rod 106 attaches to the upper surface 86 of the first plate 82 of the piston 80 .
- the first piston rod 106 is welded to the first plate 82 .
- the first piston rod 106 is movable axially with the piston 80 .
- the first piston rod 106 is tubular and includes an outer surface 110 and an inner surface 112 .
- the outer surface 110 has a diameter that is slightly smaller than the diameter of the opening 68 on the first axial end 64 of the cylinder 52 .
- the inner surface 112 defines a channel 114 that extends axially through the first piston rod 106 .
- the channel 114 is coaxial with and aligns with the opening 90 extending through the first plate 82 of the piston 80 .
- a second mounting member 116 is partially formed from an end of the first piston rod 106 opposite the piston 80 .
- the second mounting member 116 further includes a second tubular bushing 118 .
- the second tubular bushing 118 includes a channel 120 that extends perpendicular to both axis B and the channel 78 of the first tubular bushing 74 .
- the first end portion 30 of the anti-roll bar 28 extends through the channel 120 of the second tubular bushing 118 .
- a fastener (not shown) fixes the second tubular bushing 118 to the first end portion 30 of the anti-roll bar 28 .
- a slot 122 extends through the first piston rod 106 in an area near the seconding mounting member 116 .
- the slot 122 extends circumferentially about axis B around a portion of the first piston rod 106 .
- the second piston rod 108 is coaxial with the first piston rod 106 and extends through the channel 114 of the first piston rod 106 .
- the second piston rod 108 is fixed for axial movement with the first piston rod 106 .
- One end of the second piston rod 108 attaches to the upper surface 98 of the second plate 84 of the piston 80 .
- An opposite end of the second piston rod 108 terminates near the second mounting member 116 .
- the second piston rod 108 is spaced radially inwardly from the inner surface 112 of the first piston rod 106 .
- a radially extending arm 124 is connected to the second piston rod 108 .
- the radially extending arm 124 extends through the slot 122 in the first piston rod 106 .
- the radially extending arm 124 is secured to the second piston rod 108 such that movement of the arm 124 in the slot 122 causes rotation of the second piston rod 108 and consequently, rotation of the second plate 84 of the piston 80 .
- Two bearings 126 and 128 rotatably attach the second piston rod 108 to the first piston rod 106 .
- An outer race of each bearing 126 and 128 is secured to the inner surface 112 of the first piston rod 106 .
- An inner race of each bearing 126 and 128 attaches to the second piston rod 108 .
- the second piston rod 108 is rotatable relative to the first piston rod 106 .
- the axis of rotation for the second piston rod 108 is axis B.
- rotation of the second piston rod 108 relative to the first piston rod 106 causes rotation of the second plate 84 of the piston 80 relative to the first plate 82 of the piston 80 .
- the actuator 48 also includes at least two seals 130 and 132 .
- a first seal 130 is secured in the opening 68 in the first axial end 64 of the cylinder 52 .
- the first seal 130 engages the outer surface 110 of the first piston rod 106 and prevents fluid 54 leakage from the cylinder 52 as the piston assembly 56 moves axially through the opening 68 in the first axial end 64 of the cylinder 52 .
- a second seal 132 is interposed between the first and second plates 82 and 84 of the piston 80 for preventing fluid 54 leakage between the first and second plates 82 and 84 and into the channel 114 of the first piston rod 106 .
- a portion of the second seal 132 seats in the annular groove 94 on the lower surface 88 of the first plate 82 and another portion seats in the annular groove 104 on the upper surface 98 of the second plate 84 .
- the second seal 132 is an o-ring 96 that allows the second plate 84 to rotate relative to the first plate 82 .
- the apparatus 12 further includes a plurality of sensors 134 , 136 , and 138 and a controller 140 .
- the plurality of sensors 134 , 136 , and 138 includes a lateral acceleration sensor 134 , a steering wheel rotation sensor 136 , and a vehicle speed sensor 138 .
- Each sensor 134 , 136 , and 138 is electrically connected to the controller 140 .
- the lateral acceleration sensor 134 continuously senses the lateral acceleration of the vehicle and generates an electrical signal indicative of the sensed lateral acceleration.
- the steering wheel rotation sensor 136 continuously senses the magnitude and rate of rotation of the vehicle steering wheel and generates an electrical signal indicative of these parameters.
- the vehicle speed sensor 138 continuously senses the vehicle speed and generates an electrical signal indicative of the speed.
- the controller 140 includes a microprocessor.
- the controller 140 receives the signals generated by the lateral acceleration sensor 134 , the steering wheel rotation sensor 136 , and the vehicle speed sensor 138 .
- the controller 140 analyzes the respective signals and generates a control signal for controlling the torsional stiffness of the anti-roll bar 28 .
- the controller 140 sends the control signal to an electric motor used for actuating the actuator 48 .
- the electric motor is a stepper motor 142 .
- Linkage shown schematically at 146 , connects the stepper motor 142 to the arm 124 extending radially from the second piston rod 108 .
- the stepper motor 142 may be connected to the second piston rod 108 in another manner, such as through a gear assembly.
- the stepper motor 142 Upon receiving the control signal from the controller 140 , the stepper motor 142 causes the arm 124 extending radially from second piston rod 108 to move through the slot 122 in the first piston rod 106 . Movement of the arm 124 causes rotation of the second piston rod 108 , and consequently, rotation of the second plate 84 of the piston 80 relative to the first plate 82 of the piston 80 .
- FIGS. 4 ( a )- 4 ( c ) illustrate the adjustment of the flow area of the orifices 144 .
- FIG. 4( a ) illustrates the orifices 144 of the piston 80 when the axially extending passages 92 of the first plate 82 are completely aligned with the axially extending passages 102 of the second plate 84 .
- each orifice 144 is equal to the flow area of the axially extending passages 102 in the second plate 84 .
- FIG. 4( b ) shows the axially extending passages 92 of the first plate 82 partially aligned with the axially extending passages 102 of the second plate 84 .
- the flow area of the orifices 144 in FIG. 4( b ) is less than the flow area shown in FIG. 4( a ) by the area of the first plate 82 that covers the axially extending passages 102 in the second plate 84 .
- the actuator 48 is an isolated system having no fluid 54 flow into or out of the cylinder 52 , the resistance to movement of the piston 80 within the cylinder 52 is inversely proportional to the flow area of the orifices 144 .
- the orifices 144 are fully open, as shown in FIG. 4( a )
- the resistance to movement of the piston 80 will be minimized and a force along axis B will cause the piston 80 to move within cylinder 52 .
- fluid 54 will flow through the orifices 144 and the volume of one chamber, for example chamber 81 , will increase, while the volume of the other chamber 83 will decrease.
- the orifices 144 are completely closed, as shown in FIG.
- the resistance to movement of the piston 80 will be maximized and no fluid 54 may flow between the chambers 81 and 83 of the cylinder 52 .
- the piston 80 will be locked in place within the cylinder 52 as the fluid 54 will resist axial movement of the piston 80 .
- the actuator 48 affects the torsional resistance of the anti-roll bar 28 . Since the first end portion 30 of the anti-roll bar 28 is attached to a part of the vehicle suspension 10 by the actuator 48 , the movement of the piston 80 in the cylinder 52 of the actuator 48 affects the movement of the first end portion 30 of the anti-roll bar 28 . When the orifices 144 of the piston 80 are fully opened, the piston 80 will move easily within the cylinder 52 and the first end portion 30 of the anti-roll bar 28 will move easily with respect to the second end portion 32 of the anti-roll bar 28 . As a result, the anti-roll bar 28 will have virtually no resistance to roll of the vehicle.
- the piston 80 of the actuator 48 When the orifices 144 of the piston 80 of the actuator 48 are completely closed, the piston 80 will not move within the cylinder 52 of the actuator 48 and the resistance to movement of the first end portion 30 of the anti-roll bar 28 relative to the second end portion 32 of the anti-roll bar 28 is maximized. As a result, the torsional stiffness of the anti-roll bar 28 is increased and the anti-roll bar 28 will resist roll of the vehicle. This is most likely to occur when a turn is sensed. Depending upon the parameters sensed by the plurality of sensors 134 , 136 , and 138 , the flow area of the orifices 144 may be adjusted to vary the torsional resistance of the anti-roll bar 28 .
- the left-hand side 14 and the right-hand side 16 of the vehicle suspension 10 may move independently of one another with little affect from the anti-roll bar 28 .
- the anti-roll bar 28 will rigidly connect the left-hand and right-hand sides 14 and 16 of the vehicle suspension 10 and help to resist roll of the vehicle during a turn.
- FIG. 5 A second embodiment of the actuator 148 of the apparatus 10 of the present invention is illustrated in FIG. 5.
- first and second electrodes 150 and 152 are attached to the inner wall 60 of the cylinder 52 of the actuator 148 .
- Leads 154 electrically connect the electrodes 150 and 152 to the controller 140 .
- the controller 140 is operable to provide a variable electrical field, in the form of voltage, to the electrodes 150 and 152 in response to the signals received from the plurality of sensors 134 , 136 , and 138 .
- the fluid 54 within the cylinder 52 is an electrorheological fluid. By varying the voltage potential between the first and second electrodes 150 and 152 , the viscosity of the fluid 54 can be changed.
- the torsional stiffness of the anti-roll bar 28 can be further adjusted by controlling the viscosity of the fluid 54 .
- an actuator 48 may be used to connect the second end portion 32 of the anti-roll bar 28 to the vehicle suspension 10 .
- the first mounting member 70 may attach to the anti-roll bar 28 and the second mounting member 116 to a part of the vehicle suspension 10 .
Abstract
Description
- The present invention relates to an apparatus for use in a vehicle suspension and, more particularly, to an apparatus for use in helping to resist vehicle roll during a turn.
- Anti-roll bars, also known as sway bars, are used in vehicle suspensions for helping to resist vehicle roll during a turn. Anti-roll bars may be used in both the front and rear suspensions of a vehicle.
- Anti-roll bars are generally U-shaped and include opposite first and second end portions and an intermediate portion. The first end portion is fixed to the right-hand side of the vehicle suspension and the second end portion is fixed to the left-hand side of the vehicle suspension. During a vehicle turn, the first end portion and the second end portion of the anti-roll bar move relative to one another. As a result, the intermediate portion of the anti-roll bar may be subjected to a torsional force. The torsional stiffness, i.e., the resistance to the torsional force, of the intermediate portion of the anti-roll bar helps to resist vehicle roll during the turn.
- The stiffness of the anti-roll bar is also known to increase the spring rate of the vehicle suspension. The independence of the right-hand side and the left-hand side of the vehicle suspension may be affected by connecting the two sides with the anti-roll bar. Consequently, the vehicle ride may be affected, especially when the vehicle is traveling in a linear direction.
- Known systems have attached at least one end portion of the anti-roll bar to the vehicle suspension with an actuator. The actuator includes a cylinder and a piston that is movable within the cylinder. The piston divides the cylinder into two variable volume chambers. The known systems further include a source of fluid and a control valve, both of which are independent of the actuator. The control valve is connected to each chamber of the piston by a hydraulic conduit. The control valve has three positions. In a first position, the control valve interconnects the hydraulic conduit connected to each chamber of the actuator, thereby allowing unrestricted movement of the piston in the cylinder. In a second position, the control valve sends hydraulic fluid to the first chamber and receives hydraulic fluid flowing out of the second chamber. In a third position, the control valve sends hydraulic fluid to the second chamber and receives hydraulic fluid flowing out of the first chamber. A system similar to that described above is disclosed in U.S. Pat. No. 5,529,324.
- Although the known system helps to reduce the possible effects of the anti-roll bar on the spring rate of the vehicle, the known system includes many parts and installation of the known systems on a vehicle is complex.
- SUMMARY OF THE INVENTION
- This invention is an apparatus for use in a vehicle suspension. The apparatus comprises an anti-roll bar having opposite first and second end portions. An intermediate portion is interposed between the first and second end portions and is subjected to torsional forces when the first and second end portions move relative to one another. The apparatus further comprises an actuator for attaching at least one of the first and second end portions to a part of the vehicle suspension. The actuator comprises a cylinder for retaining fluid and a piston assembly for dividing the cylinder into two chambers. The piston assembly is movable within the cylinder. The piston assembly includes structure forming orifices for interconnecting the two chambers of the cylinder. A fluid flow area of the orifices is adjustable to vary a resistance to relative movement of the first and second end portions of the anti-roll bar.
- The foregoing and other features of the present invention will become apparent to those skilled in the art to which the present invention relates upon reading the following description with reference to the accompanying drawings, in which:
- FIG. 1 is a schematic view of a portion of a vehicle suspension including an apparatus constructed in accordance with the present invention;
- FIG. 2 is a schematic view of an actuator of the apparatus of the present invention;
- FIG. 3 is a view taken along line3-3 in FIG. 2;
- FIGS.4(a)-4(c) are schematic views of a portion of the actuator of FIG. 3 illustrating a change in the flow area of orifices in the actuator; and
- FIG. 5 illustrates a second embodiment of an actuator of the apparatus of the present invention.
- FIG. 1 schematically illustrates a portion of a
vehicle suspension 10 including anapparatus 12 of the present invention. - The
suspension 10 includes a left-hand side 14 and a right-hand side 16. A firststeerable wheel 18 is connected to the left-hand side 14 of thesuspension 10 and a secondsteerable wheel 20 is connected to the right-hand side 16 of thesuspension 10. - The left-
hand side 14 of thesuspension 10 includes afirst control arm 22 and the right-hand side 16 of thesuspension 10 includes asecond control arm 24. Both the first andsecond control arms Steerable wheel 18 connects with a closedportion 26 of the U-shape ofcontrol arm 22.Steerable wheel 20 connects with a closed portion 27 of the U-shape ofcontrol arm 24. - The
apparatus 12 of the present invention includes ananti-roll bar 28. Theanti-roll bar 28 includes opposite first andsecond end portions intermediate portion 34 is interposed between therespective end portions anti-roll bar 28 has a generally U-shaped configuration with the first andsecond end portions intermediate portion 34 forming a closed end of the U-shape. - The
intermediate portion 34 of theanti-roll bar 28 extends linearly. In the illustrated embodiment, theintermediate portion 34 has a length that is approximately eighty percent of the total length of theanti-roll bar 28. The total length of theanti-roll bar 28 is the length from aterminal end 36 of thefirst end portion 30 to aterminal end 38 of thesecond end portion 32. - Two
brackets intermediate portion 34 of theanti-roll bar 28. Thebrackets intermediate portion 34 of theanti-roll bar 28 to freely rotate about an axis A passing through the center of theintermediate portion 34 of theanti-roll bar 28. - The
first end portion 30 of theanti-roll bar 28 extends from the left-hand end 44 of theintermediate portion 34 of theanti-roll bar 28. In the illustrated embodiment, thefirst end portion 30 extends from theintermediate portion 34 at an angle of approximately forty-five degrees relative to axis A and has a length that is approximately one-tenth of the total length of theanti-roll bar 28. Thefirst end portion 30 terminates atterminal end 36. - The
second end portion 32 of theanti-roll bar 28 is a mirror image of thefirst end portion 30. Thesecond end portion 32 extends from a right-hand end 46 of theintermediate portion 34 of theanti-roll bar 28. In the illustrated embodiment, thesecond end portion 32 extends from theintermediate portion 34 at an angle of approximately forty-five degrees relative to axis A and has a length that is approximately one-tenth of the total length of theanti-roll bar 28. When no torsional forces are applied to theanti-roll bar 28, thesecond end portion 32 is within the same plane as thefirst end portion 30. Thesecond end portion 32 terminates atterminal end 38. - As shown in FIG. 1, the
apparatus 12 further includes anactuator 48. Theactuator 48 attaches thefirst end portion 30 of theanti-roll bar 28 to thefirst control arm 22 of thevehicle suspension 10. A detailed description of theactuator 48 is found below. - A
link member 50 attaches thesecond end portion 32 of theanti-roll bar 28 to thesecond control arm 24 of thevehicle suspension 10. Thelink member 50 is a solid steel rod that extends between thesecond control arm 24 and thesecond end portion 32 of theanti-roll bar 28. - FIGS. 2 and 3 illustrate the
actuator 48 of theapparatus 12 of the present invention. Theactuator 48 includes acylinder 52 for retaining a fluid 54 and apiston assembly 56. Description of theactuator 48 will be made with reference to axis B. As shown in FIG. 1, axis A represents a generally horizontal axis; whereas, axis B represents a generally vertical axis. - The
cylinder 52 includes an axially extending, cylindricalmain body portion 58. The cylindricalmain body portion 58 is centered on axis B. Themain body portion 58 of thecylinder 52 includes anouter wall 60 and aninner wall 62. - First and second axial ends64 and 66 close axially opposite ends of the
main body portion 58 of thecylinder 52. The firstaxial end 64 of thecylinder 52 is annular and includes anopening 68 that is centered on axis B. As illustrated in FIG. 3, theopening 68 has a diameter of approximately fifty percent of the inner diameter of themain body portion 58 of thecylinder 52. The secondaxial end 66 of thecylinder 52 is domed and completely closes thecylinder 52. - A first mounting
member 70 for attaching thecylinder 52 to thefirst control arm 22 extends from the center of the secondaxial end 66 of thecylinder 52 in a direction axially opposite themain body portion 58 of thecylinder 52. - The first mounting
member 70 illustrated in FIGS. 2 and 3 includes acylindrical rod 72 and a firsttubular bushing 74. Thecylindrical rod 72 is centered on axis B. One end of thecylindrical rod 72 is fixed to the secondaxial end 66 of thecylinder 52 and the other end of thecylindrical rod 72 is fixed to an outer surface 76 (FIG. 3) of the firsttubular bushing 74. The firsttubular bushing 74 includes achannel 78 that extends in a direction perpendicular to axis B. As shown in FIG. 1, a part of thefirst control arm 22 extends through thechannel 78 oftubular bushing 74. A fastener (not shown) fixes the firsttubular bushing 74 to thefirst control arm 22. - The
piston assembly 56 of theactuator 48 includes a piston 80 (FIG. 3) formed by first andsecond plates piston 80 is enclosed within thecylinder 52 and is movable within thecylinder 52 along axis B. Thepiston 80 divides thecylinder 52 into twovariable volume chambers 81 and Thefirst plate 82 forming thepiston 80 is flat and circular. Thefirst plate 82 is centered on axis B and extends radially outwardly to engage theinner wall 62 of themain body portion 58 of thecylinder 52. Thefirst plate 82 has anupper surface 86 and alower surface 88. Theupper surface 86 of thefirst plate 82 is nearest the firstaxial end 64 of thecylinder 52 and thelower surface 88 is nearest the secondaxial end 66 of thecylinder 52. An annular ring (not shown) may extend circumferentially around thefirst plate 82 for sealing thefirst plate 82 against theinner wall 62 of thecylinder 52. - An
opening 90 extends axially through thefirst plate 82. Theopening 90 is centered on axis B and in the illustrated embodiment has a diameter of approximately twenty-five percent of the diameter of thefirst plate 82. Those skilled in the art will recognize that the size of theopening 90 may be varied. - The
first plate 82 of thepiston 80 further includes a plurality of axially extendingpassages 92. Theaxially extending passages 92 are arranged in a circular array about axis B. Preferably, thefirst plate 82 has six axially extendingpassages 92, two of which are shown in FIG. 3. - An
annular groove 94 extends into thelower surface 88 of thefirst plate 82 in an area between thecentral opening 90 and theaxially extending passages 92. Theannular groove 94 completely surrounds thecentral opening 90. Preferably, theannular groove 94 has a rectangular cross-sectional profile for receiving a portion of an o-ring 96. - The
second plate 84 forming thepiston 80 is also flat and circular. Thesecond plate 84 is centered on axis B. As illustrated in FIG. 3, thesecond plate 84 also extends radially outwardly to engage theinner wall 62 of themain body portion 58 of thecylinder 52. Those skilled in the art will recognize that thesecond plate 84 may have a diameter that differs from the diameter of thefirst plate 82. - The
second plate 84 has anupper surface 98 and alower surface 100. Theupper surface 98 of thesecond plate 84 engages thelower surface 88 of thefirst plate 82. Thelower surface 100 of thesecond plate 84 is nearest the secondaxial end 66 of thecylinder 52. - The
second plate 84 of thepiston 80 also includes a plurality of axially extendingpassages 102 arranged in a circular array about axis B. Preferably, the second plate has six axially extendingpassages 102, as shown in FIGS. 4(a)-(c). Theaxially extending passages 102 of thesecond plate 84 may be aligned, depending upon rotation of thesecond plate 84 relative to thefirst plate 82, with theaxially extending passages 92 of thefirst plate 82 of thepiston 80. - An
annular groove 104 extends into theupper surface 98 of thesecond plate 84 in an area corresponding to theannular groove 94 in thefirst plate 82. Preferably, theannular groove 104 in thesecond plate 84 has a rectangular cross-sectional profile for receiving a portion of o-ring 96. - The
piston assembly 56 further includes first andsecond piston rods first piston rod 106 attaches to theupper surface 86 of thefirst plate 82 of thepiston 80. Preferably, thefirst piston rod 106 is welded to thefirst plate 82. Thefirst piston rod 106 is movable axially with thepiston 80. - The
first piston rod 106 is tubular and includes anouter surface 110 and aninner surface 112. Theouter surface 110 has a diameter that is slightly smaller than the diameter of theopening 68 on the firstaxial end 64 of thecylinder 52. Theinner surface 112 defines achannel 114 that extends axially through thefirst piston rod 106. Thechannel 114 is coaxial with and aligns with theopening 90 extending through thefirst plate 82 of thepiston 80. - A second mounting
member 116 is partially formed from an end of thefirst piston rod 106 opposite thepiston 80. The second mountingmember 116 further includes a secondtubular bushing 118. The secondtubular bushing 118 includes achannel 120 that extends perpendicular to both axis B and thechannel 78 of the firsttubular bushing 74. As shown in FIG. 1, thefirst end portion 30 of theanti-roll bar 28 extends through thechannel 120 of the secondtubular bushing 118. A fastener (not shown) fixes the secondtubular bushing 118 to thefirst end portion 30 of theanti-roll bar 28. - A
slot 122 extends through thefirst piston rod 106 in an area near theseconding mounting member 116. Theslot 122 extends circumferentially about axis B around a portion of thefirst piston rod 106. - The
second piston rod 108 is coaxial with thefirst piston rod 106 and extends through thechannel 114 of thefirst piston rod 106. Thesecond piston rod 108 is fixed for axial movement with thefirst piston rod 106. One end of thesecond piston rod 108 attaches to theupper surface 98 of thesecond plate 84 of thepiston 80. An opposite end of thesecond piston rod 108 terminates near the second mountingmember 116. Thesecond piston rod 108 is spaced radially inwardly from theinner surface 112 of thefirst piston rod 106. - A
radially extending arm 124 is connected to thesecond piston rod 108. Theradially extending arm 124 extends through theslot 122 in thefirst piston rod 106. Theradially extending arm 124 is secured to thesecond piston rod 108 such that movement of thearm 124 in theslot 122 causes rotation of thesecond piston rod 108 and consequently, rotation of thesecond plate 84 of thepiston 80. - Two
bearings second piston rod 108 to thefirst piston rod 106. An outer race of each bearing 126 and 128 is secured to theinner surface 112 of thefirst piston rod 106. An inner race of each bearing 126 and 128 attaches to thesecond piston rod 108. As a result, thesecond piston rod 108 is rotatable relative to thefirst piston rod 106. The axis of rotation for thesecond piston rod 108 is axis B. As those skilled in the art will recognize, rotation of thesecond piston rod 108 relative to thefirst piston rod 106 causes rotation of thesecond plate 84 of thepiston 80 relative to thefirst plate 82 of thepiston 80. - The
actuator 48 also includes at least twoseals first seal 130 is secured in theopening 68 in the firstaxial end 64 of thecylinder 52. Thefirst seal 130 engages theouter surface 110 of thefirst piston rod 106 and prevents fluid 54 leakage from thecylinder 52 as thepiston assembly 56 moves axially through theopening 68 in the firstaxial end 64 of thecylinder 52. - A
second seal 132 is interposed between the first andsecond plates piston 80 for preventingfluid 54 leakage between the first andsecond plates channel 114 of thefirst piston rod 106. A portion of thesecond seal 132 seats in theannular groove 94 on thelower surface 88 of thefirst plate 82 and another portion seats in theannular groove 104 on theupper surface 98 of thesecond plate 84. Preferably, thesecond seal 132 is an o-ring 96 that allows thesecond plate 84 to rotate relative to thefirst plate 82. - As shown in FIG. 1, the
apparatus 12 further includes a plurality ofsensors controller 140. Preferably, the plurality ofsensors lateral acceleration sensor 134, a steeringwheel rotation sensor 136, and avehicle speed sensor 138. Eachsensor controller 140. - The
lateral acceleration sensor 134 continuously senses the lateral acceleration of the vehicle and generates an electrical signal indicative of the sensed lateral acceleration. The steeringwheel rotation sensor 136 continuously senses the magnitude and rate of rotation of the vehicle steering wheel and generates an electrical signal indicative of these parameters. Thevehicle speed sensor 138 continuously senses the vehicle speed and generates an electrical signal indicative of the speed. - Preferably, the
controller 140 includes a microprocessor. Thecontroller 140 receives the signals generated by thelateral acceleration sensor 134, the steeringwheel rotation sensor 136, and thevehicle speed sensor 138. Thecontroller 140 analyzes the respective signals and generates a control signal for controlling the torsional stiffness of theanti-roll bar 28. Thecontroller 140 sends the control signal to an electric motor used for actuating theactuator 48. - Preferably, the electric motor is a
stepper motor 142. Linkage, shown schematically at 146, connects thestepper motor 142 to thearm 124 extending radially from thesecond piston rod 108. Those skilled in the art will recognize that thestepper motor 142 may be connected to thesecond piston rod 108 in another manner, such as through a gear assembly. Upon receiving the control signal from thecontroller 140, thestepper motor 142 causes thearm 124 extending radially fromsecond piston rod 108 to move through theslot 122 in thefirst piston rod 106. Movement of thearm 124 causes rotation of thesecond piston rod 108, and consequently, rotation of thesecond plate 84 of thepiston 80 relative to thefirst plate 82 of thepiston 80. - Rotation of the
second plate 84 of thepiston 80 relative to thefirst plate 82 of thepiston 80 adjusts the flow area of orifices 144 (FIG. 3) formed in thepiston 80 by alignment of theaxially extending passages 92 of thefirst plate 82 and axially extendingpassages 102 of thesecond plate 84 of thepiston 80. FIGS. 4(a)-4(c) illustrate the adjustment of the flow area of theorifices 144. FIG. 4(a) illustrates theorifices 144 of thepiston 80 when theaxially extending passages 92 of thefirst plate 82 are completely aligned with theaxially extending passages 102 of thesecond plate 84. As shown, the flow area of eachorifice 144 is equal to the flow area of theaxially extending passages 102 in thesecond plate 84. FIG. 4(b) shows theaxially extending passages 92 of thefirst plate 82 partially aligned with theaxially extending passages 102 of thesecond plate 84. The flow area of theorifices 144 in FIG. 4(b) is less than the flow area shown in FIG. 4(a) by the area of thefirst plate 82 that covers theaxially extending passages 102 in thesecond plate 84. FIG. 4(c) shows no alignment between theaxially extending passages 92 of thefirst plate 82 and theaxially extending passages 102 of thesecond plate 84. As a result, theorifices 144 of thepiston 80 shown in FIG. 4(c) have no flow area. - Since the
actuator 48 is an isolated system having no fluid 54 flow into or out of thecylinder 52, the resistance to movement of thepiston 80 within thecylinder 52 is inversely proportional to the flow area of theorifices 144. Thus, if theorifices 144 are fully open, as shown in FIG. 4(a), the resistance to movement of thepiston 80 will be minimized and a force along axis B will cause thepiston 80 to move withincylinder 52. During movement of thepiston 80,fluid 54 will flow through theorifices 144 and the volume of one chamber, forexample chamber 81, will increase, while the volume of theother chamber 83 will decrease. However, if theorifices 144 are completely closed, as shown in FIG. 4(c), the resistance to movement of thepiston 80 will be maximized and no fluid 54 may flow between thechambers cylinder 52. As a result, thepiston 80 will be locked in place within thecylinder 52 as the fluid 54 will resist axial movement of thepiston 80. - When the
apparatus 12 is mounted on a vehicle, theactuator 48 affects the torsional resistance of theanti-roll bar 28. Since thefirst end portion 30 of theanti-roll bar 28 is attached to a part of thevehicle suspension 10 by theactuator 48, the movement of thepiston 80 in thecylinder 52 of theactuator 48 affects the movement of thefirst end portion 30 of theanti-roll bar 28. When theorifices 144 of thepiston 80 are fully opened, thepiston 80 will move easily within thecylinder 52 and thefirst end portion 30 of theanti-roll bar 28 will move easily with respect to thesecond end portion 32 of theanti-roll bar 28. As a result, theanti-roll bar 28 will have virtually no resistance to roll of the vehicle. This is most likely to occur when the vehicle is traveling in a straight line. When theorifices 144 of thepiston 80 of theactuator 48 are completely closed, thepiston 80 will not move within thecylinder 52 of theactuator 48 and the resistance to movement of thefirst end portion 30 of theanti-roll bar 28 relative to thesecond end portion 32 of theanti-roll bar 28 is maximized. As a result, the torsional stiffness of theanti-roll bar 28 is increased and theanti-roll bar 28 will resist roll of the vehicle. This is most likely to occur when a turn is sensed. Depending upon the parameters sensed by the plurality ofsensors orifices 144 may be adjusted to vary the torsional resistance of theanti-roll bar 28. - When the
orifices 144 of thepiston 80 are fully open, the left-hand side 14 and the right-hand side 16 of thevehicle suspension 10 may move independently of one another with little affect from theanti-roll bar 28. However, when theorifices 144 on thepiston 80 are closed, theanti-roll bar 28 will rigidly connect the left-hand and right-hand sides vehicle suspension 10 and help to resist roll of the vehicle during a turn. - A second embodiment of the
actuator 148 of theapparatus 10 of the present invention is illustrated in FIG. 5. In FIG. 5, first andsecond electrodes inner wall 60 of thecylinder 52 of theactuator 148.Leads 154 electrically connect theelectrodes controller 140. In addition to the functions previously described, thecontroller 140 is operable to provide a variable electrical field, in the form of voltage, to theelectrodes sensors cylinder 52 is an electrorheological fluid. By varying the voltage potential between the first andsecond electrodes orifices 144 is changed and resistance to movement of thepiston 80 in thecylinder 52 is changed. As a result, the torsional stiffness of theanti-roll bar 28 can be further adjusted by controlling the viscosity of the fluid 54. - From the above description of the invention, those skilled in the art will perceive improvements, changes and modifications. For example, in place of or in addition to the
actuator 48 described above, anactuator 48 may be used to connect thesecond end portion 32 of theanti-roll bar 28 to thevehicle suspension 10. Those skilled in the art will also recognize that the first mountingmember 70 may attach to theanti-roll bar 28 and the second mountingmember 116 to a part of thevehicle suspension 10. Such improvements, changes and modifications within the skill of the art are intended to be covered by the appended claims.
Claims (11)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US09/788,080 US6457730B1 (en) | 2001-02-16 | 2001-02-16 | Anti-roll bar with link actuator for controlling torsional rigidity |
EP02003450A EP1232884A3 (en) | 2001-02-16 | 2002-02-14 | Anti-roll bar with link actuator for controlling torsional rigidity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/788,080 US6457730B1 (en) | 2001-02-16 | 2001-02-16 | Anti-roll bar with link actuator for controlling torsional rigidity |
Publications (2)
Publication Number | Publication Date |
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US20020113393A1 true US20020113393A1 (en) | 2002-08-22 |
US6457730B1 US6457730B1 (en) | 2002-10-01 |
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Application Number | Title | Priority Date | Filing Date |
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US09/788,080 Expired - Fee Related US6457730B1 (en) | 2001-02-16 | 2001-02-16 | Anti-roll bar with link actuator for controlling torsional rigidity |
Country Status (2)
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US (1) | US6457730B1 (en) |
EP (1) | EP1232884A3 (en) |
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EP1232884A3 (en) | 2006-03-29 |
EP1232884A2 (en) | 2002-08-21 |
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