US20010042663A1 - Position-sensitive shock absorber - Google Patents
Position-sensitive shock absorber Download PDFInfo
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- US20010042663A1 US20010042663A1 US09/916,093 US91609301A US2001042663A1 US 20010042663 A1 US20010042663 A1 US 20010042663A1 US 91609301 A US91609301 A US 91609301A US 2001042663 A1 US2001042663 A1 US 2001042663A1
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- cylinder
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- shock absorber
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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
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/066—Units characterised by the partition, baffle or like element
- F16F9/067—Partitions of the piston type, e.g. sliding pistons
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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
- F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
- F16F9/0209—Telescopic
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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
- F16F9/3207—Constructional features
- F16F9/3235—Constructional features of cylinders
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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
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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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
- F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
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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
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
Definitions
- suspensions and supports include a spring and a damping device to help isolate that supported from the support structure or surface.
- automotive vehicles commonly use separate springs and simple shock absorbers to support the vehicle frame on the axle assemblies.
- Simple shock absorbers are typically oil-filled cylinders within which a vented piston is mounted. The piston is connected to a shaft which extends out of one end of the cylinder. The outer end of the shaft is mounted to one point on the vehicle and the other end of the cylinder is mounted to another point on the vehicle in parallel with the suspension spring.
- simple shock absorbers only provide damping and not support.
- shock absorber which is the type commonly used with motorcycles, off-road vehicles, competition automotive vehicles and off-road bicycles, combines both the suspension function and the shock absorbing function in one unit.
- This second type of shock absorber commonly uses a spring unit to provide the suspension function coupled with a damping unit to provide the damping function.
- Conventional shock absorber designs commonly incorporate an external coil spring, an internal air spring, or an internal bladder to provide the suspension function.
- Typical shock absorbers also referred to as shocks
- CD compression damping
- RD rebound damping
- the other refers to force created during “outward” travel of the shaft (lengthening of the shock).
- CD compression damping
- RD rebound damping
- Some shocks are externally adjustable by the user to provide for RD and/or CD adjustment.
- Piston-type shock absorbers can be designed to provide the same amount of damping on both the compression stroke and the rebound stroke.
- the fluid passageways through the vented, damping piston can be designed so that the restriction to fluid flow through the damping piston during the compression stroke is different than the restriction to fluid flow during the rebound stroke. In this case the damping during the entire compression stroke is different than the damping during the entire rebound stroke.
- Position-sensitive damping is typically achieved by the combination of conventional vented piston damping, with the oil flowing through the damping piston, plus damping provided by the passage of oil around the damping piston through a bypass chamber or channel, which permits oil to bypass the piston during a portion of the piston stroke.
- the bypass channel thus permits lesser damping over the portion of the stroke during which some fluid flows around the piston through the bypass channel. Therefore, the shock can have different damping characteristics along different segments of the stroke. This is beneficial to the user because a single set of shocks can provide smooth damping for less aggressive riding and firm damping for aggressive riding without making any adjustments during the ride.
- the shocks can provide reduced damping in the mid-stroke zone, where the shock is most active in, for example, trail riding or other less aggressive riding. If the rider starts riding more aggressively, or hits a large bump, causing the shock to compress deeper into the stroke, the bypass damping then becomes available and the shock relies on the conventional piston damping.
- This type of shock absorber has been available for many years.
- a position-sensitive shock absorber has been sold by Fox Factory, Inc. of San Jose, Calif. since about 1987.
- U.S. Pat. No. 5,178,239 illustrates another example of a position-sensitive shock absorber. The position-sensitive damping action of the bypass channel is available during both the compression and rebound strokes.
- the present invention is directed to shock absorbers, including position-sensitive shock absorbers in which the position-sensitive damping can be different during compression and rebound strokes, and shock absorbers with damping adjusters which vary the damping provided during compression and rebound strokes.
- the position-sensitive shock absorber includes a cylinder within which a piston is movably mounted for movement between the first and second ends of the cylinder.
- First and second bypass openings open into the cylinder interior at axially spaced-apart positions.
- the bypass openings are coupled by a bypass channel.
- a flow valve is positioned along the bypass channel permitting fluid flow from the first opening to the second opening and restricting fluid flow from the second opening to the first opening.
- the first bypass opening may be selectively sealed by, for example, a movable closing member which is used to selectively cover or uncover the bypass opening. This selective sealing can be through the use of electromagnetic energy.
- the closing member can be biased to either cover or uncover the opening, the closing member overcoming the biasing force when a shock absorber is accelerated to an appropriate degree.
- the flow valve may also be a check valve.
- Another aspect of the invention is directed to a position-sensitive shock absorber with a piston movably mounted within the cylinder for movement between the first and second ends of the cylinder.
- First and second bypass openings coupled by a bypass channel, open into the cylinder interior.
- a pressurized gas container is fluidly coupled to the cylinder interior.
- a movable barrier separates the pressurized gas container from the cylinder interior.
- a shaft having an inner end secured to the piston and an outer end extending out past the first end of the cylinder, is sealed by a shaft seal assembly.
- a spring element couples the shaft and the cylinder.
- This invention is also directed to a method for modifying the front forks in which any existing shock-absorbing components are removed from within the telescoping front forks of a wheeled vehicle and the above-described position-sensitive shock absorber is mounted within each telescoping front fork.
- a further aspect of the invention is directed to a shock absorber including a cylinder with a piston movably mounted within the cylinder.
- a pressurized gas container is fluidly coupled to the cylinder interior and a movable barrier separates the pressurized gas container and the cylinder interior.
- a shaft has an inner end secured to the piston and an outer extending out past the first end of the cylinder.
- This shock absorber includes one or both of the following compression damping adjuster and/or rebound damping adjuster.
- the compressing damping adjuster includes a flow controller having a first path permitting substantially free fluid flow in a rebound direction from the movable barrier towards the piston and second flow path for fluid flow in a compression direction.
- the compression damping adjuster also includes an adjustable position flow restrictor situated along the second flow path to adjust the restriction to fluid flow in the damping direction.
- the rebound damping adjuster includes a rebound flow path through the piston and a rebound flow-restricting element movable to vary the restriction to rebound fluid flow along the rebound flow path.
- the shaft is a hollow shaft and the rebound flow-restricting element includes a rod housed within the hollow shaft.
- a rod position adjuster is mounted to the shaft and engages the rod so to adjust the axial position of the rod along the hollow shaft.
- FIG. 1 is a side cross-sectional view of a position-sensitive shock absorber made according to the invention with the piston in a rest position prior to beginning the compression stroke;
- FIG. 2 shows the shock absorber of FIG. 1 at the beginning of a compression stroke
- FIG. 3 shows the shock absorber of FIG. 2 further along the compression stroke
- FIG. 4 illustrates the shock absorber of FIG. 3 as it approaches the end of its compression stroke
- FIG. 5 is an enlarged cross-sectional view of a central portion of the cylinder and bypass cylinder of the shock absorber of FIG. 1 illustrating the expandable bands acting as check valves covering two different bypass openings;
- FIG. 5B illustrates the structure of FIG. 5A with one of the sets of bypass openings covered and one uncovered;
- FIG. 5C shows a further alternative embodiment of the structure of FIG. 5A in which the rings are spring-biased to either cover or uncover the bypass openings so that only upon sufficient acceleration of the shock will the ring deflect the spring sufficiently to either cover or uncover the associated bypass openings;
- FIG. 6 is overall view of a suspension-type shock absorber
- FIGS. 6 A- 6 C are enlarged cross-sectional views of the left-hand, middle and right-hand portions of the shock absorber of FIG. 6;
- FIG. 8 is an enlarged view of the vented piston of FIG. 6B.
- FIGS. 1 - 5 illustrate one aspect of the present invention directed to a position-sensitive shock absorber 2 including a cylinder 4 having an interior 6 , first and second ends 8 , 10 and defining an axis 12 .
- a floating piston 14 divides interior 6 into a damping fluid chamber 16 and a gas chamber 18 .
- Gas chamber 18 can be pressurized through a pressurization port 20 .
- Gas chamber 18 and floating piston 14 accommodate the volume of oil or other damping fluid within chamber 16 displaced by the movement of shaft 19 into chamber 16 .
- the compression of the gas within gas chamber 18 is suggested by arrows 21 A- 21 D in FIGS. 1 - 4 .
- Bands 40 , 42 act as check valve elements which permit fluid flow from the damping fluid chamber to the bypass channel but restricts, and typically prevents, fluid flow in the opposite direction.
- the shock absorber will exhibit different damping characteristics along the same segment of the stroke depending upon whether the stroke is the compression stroke or the rebound stroke.
- FIG. 1 illustrates damping piston 34 at rest adjacent the first end of the cylinder.
- the movement of the damping piston upwardly, that is in the compression stroke, is dampened only by the flow of damping fluid through the damping piston (see arrows 48 in FIG. 2) until the damping piston seal 50 , which contacts and seals against the interior of cylinder 4 , passes bypass opening 24 .
- fluid flow can be both through damping piston 34 via arrows 48 and also can bypass the damping piston through bypass openings 28 , 30 , 32 , along bypass channel 38 and back through bypass openings 24 , 26 as illustrated in FIG. 2.
- This 3/2 zone flow through 3 and 2 bypass openings on either side of the piston provides the softest (least damped) zone of the compression stroke.
- the rebound stroke exhibits no bypass fluid flow (a 0/0 zone) until seal 50 passes bypass opening 32 .
- fluid flow is out through bypass openings 24 , 26 , 28 ( 30 being covered by seal 50 ) and back in through bypass opening 32 for a 3/1 zone.
- the bypass zone remains 3/1 because fluid cannot flow from bypass channel 38 through opening 30 .
- the bypass zone is a 2/1 zone until seal 50 covers opening 26 . With opening 26 covered but opening 24 open, the fluid can pass through openings 24 and 32 only, a 1/1 zone. Once seal 50 covers opening 24 no bypass occurs, a 0/0 zone.
- check valves created at openings 28 , 30 may be substantially leak-proof, they may permit some amount of leakage even when nominally closed. Additionally, the stiffness of the check valve material can be tailored to alter the amount of damping achieved by the valve in the open or semi-open state. A relatively stiffer material will provide more damping associated with the related bypass hole. The purpose is to provide an additional damping tuning feature, thus providing a means for optimal damping calibration.
- the check valve can be a semicircular spring band fixed to the body 4 at one end and covering the bypass hole at the other end.
- the damping effect associated with the check valve/bypass hole can be altered upon assembly or using a rotating, reciprocation, or solenoid scheme as described above.
- Rings 166 , 168 are made of a ferromagnetic material so they can be attracted by a magnetic field. Selectively energizing the appropriate lead 184 , 186 , which can be done manually or automatically, creates a magnetic field and causes the associated ring 166 , 168 to shift axial position to cover, and thus at least substantially seal, or uncover openings 172 , 174 . Small magnets 167 , 169 are mounted to either end of rings 166 , 168 ; magnetic attraction between magnets 167 , 169 and snap rings 170 keep rings 166 , 168 in place until coils 178 are again energized.
- the feature can be used to increase or decrease compression damping associated with the vehicle's chassis response to a bump.
- compression springs 188 , 190 , rings 166 A, 168 A could be or include magnets, which would oppose like poles of magnets carried by cylinder 4 , to bias the rings to covering or uncovering positions.
- Shock absorber 60 includes a cylinder 62 having a first end 64 and a second end 66 .
- a cylinder extension 68 extends from second end 66 .
- the combination of cylinder 62 and cylinder extension 68 defines a cylinder interior 70 .
- Cylinder interior 70 is divided between a damping fluid chamber 72 and a pressurized gas chamber 74 by a floating piston 76 .
- Gas chamber 74 can be precharged with a pressurized gas, typically nitrogen, or can be charged through a pressurization port, not shown.
- Pressurized gas chamber 74 and floating piston 76 accommodates the volume of oil or other damping fluid within chamber 72 displaced by the movement of a shaft 78 into and out of chamber 72 .
- shock absorber 80 does not show the use of check valves or other flow control valves to restrict flow between the bypass openings along bypass channel 92 .
- flow control valves could be used with the embodiment of FIGS. 6 - 8 just as they are used with they embodiment of FIGS. 1 - 5 C.
- Shaft 78 passes through a shaft seal assembly 102 at a first end 64 of cylinder 62 .
- a spacer sleeve 104 is mounted about shaft 78 is captured between shaft seal assembly 102 and a rebound spring 106 .
- Rebound spring 106 helps to dampen the impact of excessive rebounding of the shock by cushioning the impact of piston 80 against shaft seal assembly 102 .
- a coil spring 108 is captured between the first end 110 of bypass cylinder 90 and one end 112 , shown in dashed lines, of, for example, the front forks of a motorcycle or other wheeled vehicle.
- the distal end 114 of cylinder extension 68 is sealed by a threaded cap 116 which is typically threaded to the upper end of the vehicle's tubular fork housing.
- FIG. 7 is an enlarged illustration showing a flow controller 118 at second end 66 of cylinder 62 .
- Flow controller 118 provides for relatively free fluid flow along a rebound stroke flow path 120 during the rebound stroke, that is with piston 80 moving away from piston 76 in this embodiment.
- flow controller 118 can pass through flow controller 118 along two different compression stroke flow paths 122 , 124 .
- Flow along path 122 is substantially restricted by the use of several washers 126 as opposed to the single, easily flexed washer 128 .
- the fluid flow through flow controller 118 is determined by the volume of shaft 78 being extended into and retracted from damping fluid chamber 72 , which is filled with an incompressible fluid, typically oil.
- the damping created by flow controller 118 is constant throughout the entire compression stroke.
- Flow controller 118 also includes a central passageway 130 having a tapered opening 132 which can be fully or partially obstructed by the flow restricting tip 134 of an adjustment rod 136 .
- An adjustment screw 138 mounted to threaded cap 116 is used to adjust the axial position of rod 136 and thus the size of the opening formed between tapered opening 132 and tip 134 .
- FIG. 8 illustrates fluid flows through vented piston 80 during both compression and rebound strokes.
- the fluid flows through piston 80 during the compression stroke is indicated by compression flow path 140 while the flow during the rebound stroke and indicated by rebound flow paths 142 , 144 .
- the restriction along rebound flow path 144 is adjustable by the user. This is achieved by rotating a rebound damping adjustment screw 146 threadably mounted to an outer end mounting adapter 148 which is secured to the outer end 150 of shaft 78 , typically by threads. Adjusting the axial position of screw 146 causes the flow restricting tip 152 of a rebound damping adjustment rod 154 to be moved into and out of the tapered opening 156 at one end of a fluid passageway 158 formed through the center of piston 80 .
- supplemental rebound flow path 144 passes through a bleed hole 160 formed in shaft 78 , passes along the channel formed between tip 152 and tapered opening 156 and out of fluid passageway 158 .
- pressurized gas chamber 74 is shown aligned with and an extension of cylinder 62 . If desired it could be positioned in other areas and could be fluidly coupled through a flexible tube instead of a rigid connection. Also, floating piston 76 could be replaced by a diaphragm, bellows or other fluid force-transmitting barrier.
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Abstract
Description
- This application claims the benefit of the following provisional patent applications: 60/106,028, filed Oct. 28, 1998 and 60/106,380, filed Oct. 29, 1998.
- Many types of suspensions and supports include a spring and a damping device to help isolate that supported from the support structure or surface. For example, automotive vehicles commonly use separate springs and simple shock absorbers to support the vehicle frame on the axle assemblies. Simple shock absorbers are typically oil-filled cylinders within which a vented piston is mounted. The piston is connected to a shaft which extends out of one end of the cylinder. The outer end of the shaft is mounted to one point on the vehicle and the other end of the cylinder is mounted to another point on the vehicle in parallel with the suspension spring. Thus, simple shock absorbers only provide damping and not support.
- Another type of shock absorber, which is the type commonly used with motorcycles, off-road vehicles, competition automotive vehicles and off-road bicycles, combines both the suspension function and the shock absorbing function in one unit. This second type of shock absorber commonly uses a spring unit to provide the suspension function coupled with a damping unit to provide the damping function. Conventional shock absorber designs commonly incorporate an external coil spring, an internal air spring, or an internal bladder to provide the suspension function.
- Typical shock absorbers (also referred to as shocks) provide two kinds of damping: compression damping (“CD”), and rebound damping (“RD”). One refers to damping force created during “inward” travel of the shaft (shortening of the shock), the other refers to force created during “outward” travel of the shaft (lengthening of the shock). Generally, but not always—depending on linkage connecting shock to vehicle, RD applies during outward motion and CD applies during inward motion. Some shocks are externally adjustable by the user to provide for RD and/or CD adjustment.
- Piston-type shock absorbers can be designed to provide the same amount of damping on both the compression stroke and the rebound stroke. Alternatively, the fluid passageways through the vented, damping piston can be designed so that the restriction to fluid flow through the damping piston during the compression stroke is different than the restriction to fluid flow during the rebound stroke. In this case the damping during the entire compression stroke is different than the damping during the entire rebound stroke.
- Another type of damping is called position-sensitive damping. Position-sensitive damping is typically achieved by the combination of conventional vented piston damping, with the oil flowing through the damping piston, plus damping provided by the passage of oil around the damping piston through a bypass chamber or channel, which permits oil to bypass the piston during a portion of the piston stroke. The bypass channel thus permits lesser damping over the portion of the stroke during which some fluid flows around the piston through the bypass channel. Therefore, the shock can have different damping characteristics along different segments of the stroke. This is beneficial to the user because a single set of shocks can provide smooth damping for less aggressive riding and firm damping for aggressive riding without making any adjustments during the ride. For example, the shocks can provide reduced damping in the mid-stroke zone, where the shock is most active in, for example, trail riding or other less aggressive riding. If the rider starts riding more aggressively, or hits a large bump, causing the shock to compress deeper into the stroke, the bypass damping then becomes available and the shock relies on the conventional piston damping. This type of shock absorber has been available for many years. For example, a position-sensitive shock absorber has been sold by Fox Factory, Inc. of San Jose, Calif. since about 1987. U.S. Pat. No. 5,178,239 illustrates another example of a position-sensitive shock absorber. The position-sensitive damping action of the bypass channel is available during both the compression and rebound strokes.
- The present invention is directed to shock absorbers, including position-sensitive shock absorbers in which the position-sensitive damping can be different during compression and rebound strokes, and shock absorbers with damping adjusters which vary the damping provided during compression and rebound strokes.
- The position-sensitive shock absorber includes a cylinder within which a piston is movably mounted for movement between the first and second ends of the cylinder. First and second bypass openings open into the cylinder interior at axially spaced-apart positions. The bypass openings are coupled by a bypass channel. A flow valve is positioned along the bypass channel permitting fluid flow from the first opening to the second opening and restricting fluid flow from the second opening to the first opening. The first bypass opening may be selectively sealed by, for example, a movable closing member which is used to selectively cover or uncover the bypass opening. This selective sealing can be through the use of electromagnetic energy. Alternatively, the closing member can be biased to either cover or uncover the opening, the closing member overcoming the biasing force when a shock absorber is accelerated to an appropriate degree. The flow valve may also be a check valve.
- Another aspect of the invention is directed to a position-sensitive shock absorber with a piston movably mounted within the cylinder for movement between the first and second ends of the cylinder. First and second bypass openings, coupled by a bypass channel, open into the cylinder interior. A pressurized gas container is fluidly coupled to the cylinder interior. A movable barrier separates the pressurized gas container from the cylinder interior. A shaft, having an inner end secured to the piston and an outer end extending out past the first end of the cylinder, is sealed by a shaft seal assembly. A spring element couples the shaft and the cylinder. This invention is also directed to a method for modifying the front forks in which any existing shock-absorbing components are removed from within the telescoping front forks of a wheeled vehicle and the above-described position-sensitive shock absorber is mounted within each telescoping front fork.
- A further aspect of the invention is directed to a shock absorber including a cylinder with a piston movably mounted within the cylinder. A pressurized gas container is fluidly coupled to the cylinder interior and a movable barrier separates the pressurized gas container and the cylinder interior. A shaft has an inner end secured to the piston and an outer extending out past the first end of the cylinder. This shock absorber includes one or both of the following compression damping adjuster and/or rebound damping adjuster. The compressing damping adjuster includes a flow controller having a first path permitting substantially free fluid flow in a rebound direction from the movable barrier towards the piston and second flow path for fluid flow in a compression direction. The compression damping adjuster also includes an adjustable position flow restrictor situated along the second flow path to adjust the restriction to fluid flow in the damping direction. The rebound damping adjuster includes a rebound flow path through the piston and a rebound flow-restricting element movable to vary the restriction to rebound fluid flow along the rebound flow path. The shaft is a hollow shaft and the rebound flow-restricting element includes a rod housed within the hollow shaft. A rod position adjuster is mounted to the shaft and engages the rod so to adjust the axial position of the rod along the hollow shaft.
- Other features and advantages of the invention will appear from the following description in which the preferred embodiments have been set forth in detail in conjunction with the accompanying drawings.
- FIG. 1 is a side cross-sectional view of a position-sensitive shock absorber made according to the invention with the piston in a rest position prior to beginning the compression stroke;
- FIG. 2 shows the shock absorber of FIG. 1 at the beginning of a compression stroke;
- FIG. 3 shows the shock absorber of FIG. 2 further along the compression stroke;
- FIG. 4 illustrates the shock absorber of FIG. 3 as it approaches the end of its compression stroke;
- FIG. 5 is an enlarged cross-sectional view of a central portion of the cylinder and bypass cylinder of the shock absorber of FIG. 1 illustrating the expandable bands acting as check valves covering two different bypass openings;
- FIG. 5A illustrates an alternative embodiment of the structure of FIG. 5 in which rings are positioned within the bypass channel to cover or uncover bypass openings under the influence of a pair of electromagnetic coils, both of the sets of bypass openings being uncovered;
- FIG. 5B illustrates the structure of FIG. 5A with one of the sets of bypass openings covered and one uncovered;
- FIG. 5C shows a further alternative embodiment of the structure of FIG. 5A in which the rings are spring-biased to either cover or uncover the bypass openings so that only upon sufficient acceleration of the shock will the ring deflect the spring sufficiently to either cover or uncover the associated bypass openings;
- FIG. 6 is overall view of a suspension-type shock absorber;
- FIGS.6A-6C are enlarged cross-sectional views of the left-hand, middle and right-hand portions of the shock absorber of FIG. 6;
- FIG. 7 is an enlarged view of the flow controller of FIG. 6C; and
- FIG. 8 is an enlarged view of the vented piston of FIG. 6B.
- FIGS.1-5 illustrate one aspect of the present invention directed to a position-
sensitive shock absorber 2 including acylinder 4 having an interior 6, first and second ends 8, 10 and defining anaxis 12. A floatingpiston 14 divides interior 6 into a dampingfluid chamber 16 and agas chamber 18.Gas chamber 18 can be pressurized through apressurization port 20.Gas chamber 18 and floatingpiston 14 accommodate the volume of oil or other damping fluid withinchamber 16 displaced by the movement ofshaft 19 intochamber 16. The compression of the gas withingas chamber 18 is suggested byarrows 21A-21D in FIGS. 1-4. - A vented
piston 22 is movably mounted within the cylinder for moving between the first and second ends of the cylinder. A number of axially separatedbypass openings bypass cylinder 36 surroundscylinder 4 and defines acylindrical bypass channel 38.Bypass openings piston 22 when the piston is positioned between these bypass openings thus reducing the damping during this portion of the stroke. See FIG. 2.Bypass openings expandable bands annular grooves cylinder 4. See also FIG. 5.Bands - FIG. 1 illustrates damping piston34 at rest adjacent the first end of the cylinder. The movement of the damping piston upwardly, that is in the compression stroke, is dampened only by the flow of damping fluid through the damping piston (see
arrows 48 in FIG. 2) until the dampingpiston seal 50, which contacts and seals against the interior ofcylinder 4, passesbypass opening 24. When this occurs fluid flow can be both through damping piston 34 viaarrows 48 and also can bypass the damping piston throughbypass openings bypass channel 38 and back throughbypass openings - The next zone of the compression stroke is created when
piston seal 50 covers bypass opening 28 as shown in FIG. 3. This 2/2 zone of the compression stroke is still soft but not as soft as that of FIG. 2. The 2/2 zone of FIG. 3 continues untilbypass opening 30 is covered bypiston seal 50. This creates a short 1/2 zone (not illustrated) untilpiston seal 50covers bypass opening 32. Continued compression stroke movement, see FIG. 4, results in a 0/0 zone—that is no fluid bypasses the damping piston. - The rebound stroke, not shown, exhibits no bypass fluid flow (a 0/0 zone) until
seal 50 passes bypassopening 32. At this point fluid flow is out throughbypass openings seal 50 passes bypass opening 30, the bypass zone remains 3/1 because fluid cannot flow frombypass channel 38 throughopening 30. Onceseal 50 covers opening 28, the bypass zone is a 2/1 zone untilseal 50 covers opening 26. With opening 26 covered but opening 24 open, the fluid can pass throughopenings seal 50 covers opening 24 no bypass occurs, a 0/0 zone. - Thus, it is seen that the amount of damping fluid bypass varies along both the compression and rebound strokes and may be different along the same segments of the cylinder on the compression and rebound strokes.
-
Bands bands openings - In some situations it may be desired to add additional check valves to reduce or even prevent bypass flow. By installing an additional check valve in the groove at26, rebound and compression flow in all of the bypass zones is effectively reduced to a 1/1 zone. Installing bands at the remaining bypass holes 24 and 32 eliminates all bypass flow paths, a 0/0 zone.
- It may be desired to permit user adjustment of bypass damping. One way to do so is to permit
bypass cylinder 36 to rotate and/or reciprocate relative tocylinder 4. This movement would cause bypass opening seals and one-way valve elements to selectively cover and uncover various bypass openings. This would permit some or all of the bypass openings to be completely sealed, left completely open or provided with a check valve. The check valves could, as described below with reference to FIGS. 5A and 5B, be remotely adjusted through the use of solenoid valves. The solenoid valve would be used to restrict the available movement of the check valve. This can be done proportionally or bi-modally. - The check valve can be a semicircular spring band fixed to the
body 4 at one end and covering the bypass hole at the other end. By changing the effective stiffness of the spring element (shorter is proportionally stiffer) the damping effect associated with the check valve/bypass hole can be altered upon assembly or using a rotating, reciprocation, or solenoid scheme as described above. - FIGS. 5A and 5B illustrate the use of a pair of axially-
slidable rings bypass opening openings openings 172 covered andopenings 174 uncovered.Bypass openings 172 are surrounded by anexpandable band 176. The regions between each pair of snap rings 170 are surrounded by center tap coils 178, 180; each coil has acommon ground 182 and a pair ofleads coil 180 not being shown in FIGS. 5A and 5B.Rings appropriate lead ring openings Small magnets rings magnets rings coils 178 are again energized. - FIG. 5C illustrates an embodiment similar to that of FIGS. 5A and 5B with like components referred to with like reference numerals.
Rings magnets springs openings 172 and uncoveropenings 174 as shown in FIG. 5C. The axial component of acceleration inducesrings springs bypass openings cylinder 4, to bias the rings to covering or uncovering positions. - Another aspect of the invention relates to a
shock absorber 60 shown in FIGS. 6-8.Shock absorber 60 is a suspension-type shock absorber particularly useful for supplying the suspension and shock absorbing functions of the front forks of motorcycles, mountain bikes and similar wheeled vehicles. Whileshock absorber 60 could be used as part of the original equipment for the front forks, it is also adapted for retrofit applications. In retrofit applications the user would remove existing shock absorbers from within the front forks, leaving the telescoping tubular fork housings. The shock absorber made according to the invention could be installed within the tubular fork housings as a sealed unit. -
Shock absorber 60 includes acylinder 62 having afirst end 64 and asecond end 66. Acylinder extension 68 extends fromsecond end 66. The combination ofcylinder 62 andcylinder extension 68 defines acylinder interior 70.Cylinder interior 70 is divided between a dampingfluid chamber 72 and apressurized gas chamber 74 by a floatingpiston 76.Gas chamber 74 can be precharged with a pressurized gas, typically nitrogen, or can be charged through a pressurization port, not shown.Pressurized gas chamber 74 and floatingpiston 76 accommodates the volume of oil or other damping fluid withinchamber 72 displaced by the movement of ashaft 78 into and out ofchamber 72. - A vented
piston 80 is secured to theinner end 81 ofshaft 78 for movement withincylinder 62. A number of axially separated bypass openings 82-88 are formed throughcylinder 62. This portion ofcylinder 62 is surrounded by abypass cylinder 90 which defines acylindrical bypass channel 92 betweencylinders piston 80 moving towards floatingpiston 76. As suggested in FIG. 8, fluid flow through ventedpiston 80 can also occur during both the compression and rebound strokes. The variation and the flow through the various bypass openings aspiston 80 covers up and passes each of the openings 82-88 is similar to that discussed above with regard toshock absorber 2 and thus will not be discussed in detail.Shock absorber 80 does not show the use of check valves or other flow control valves to restrict flow between the bypass openings alongbypass channel 92. However, such flow control valves could be used with the embodiment of FIGS. 6-8 just as they are used with they embodiment of FIGS. 1-5C. - The position of
bypass cylinder 90 alongcylinder 62 can be changed by adjusting a threadedring 94 which engagesthreads 96 assecond end 66 ofcylinder 62. Aspacer sleeve 98 is used between threadedring 94 and thesecond end 100 ofbypass cylinder 90. -
Shaft 78 passes through ashaft seal assembly 102 at afirst end 64 ofcylinder 62. Aspacer sleeve 104 is mounted aboutshaft 78 is captured betweenshaft seal assembly 102 and arebound spring 106. Reboundspring 106 helps to dampen the impact of excessive rebounding of the shock by cushioning the impact ofpiston 80 againstshaft seal assembly 102. - A
coil spring 108 is captured between thefirst end 110 ofbypass cylinder 90 and oneend 112, shown in dashed lines, of, for example, the front forks of a motorcycle or other wheeled vehicle. The distal end 114 ofcylinder extension 68 is sealed by a threadedcap 116 which is typically threaded to the upper end of the vehicle's tubular fork housing. - In addition to the damping through vented
piston 80 and the position-sensitive damping provided by bypass openings 82-88,shock absorber 60 permits the user to adjust both compression damping and rebound damping over the entire stroke in compression and rebound. FIG. 7 is an enlarged illustration showing aflow controller 118 atsecond end 66 ofcylinder 62.Flow controller 118 provides for relatively free fluid flow along a reboundstroke flow path 120 during the rebound stroke, that is withpiston 80 moving away frompiston 76 in this embodiment. However, during compression fluid flow can pass throughflow controller 118 along two different compressionstroke flow paths path 122 is substantially restricted by the use ofseveral washers 126 as opposed to the single, easily flexedwasher 128. The fluid flow throughflow controller 118 is determined by the volume ofshaft 78 being extended into and retracted from dampingfluid chamber 72, which is filled with an incompressible fluid, typically oil. The damping created byflow controller 118 is constant throughout the entire compression stroke.Flow controller 118 also includes acentral passageway 130 having a taperedopening 132 which can be fully or partially obstructed by theflow restricting tip 134 of anadjustment rod 136. Anadjustment screw 138 mounted to threadedcap 116 is used to adjust the axial position ofrod 136 and thus the size of the opening formed betweentapered opening 132 andtip 134. - FIG. 8 illustrates fluid flows through vented
piston 80 during both compression and rebound strokes. The fluid flows throughpiston 80 during the compression stroke is indicated bycompression flow path 140 while the flow during the rebound stroke and indicated byrebound flow paths 142, 144. The restriction along rebound flow path 144 is adjustable by the user. This is achieved by rotating a rebound dampingadjustment screw 146 threadably mounted to an outerend mounting adapter 148 which is secured to theouter end 150 ofshaft 78, typically by threads. Adjusting the axial position ofscrew 146 causes theflow restricting tip 152 of a rebound dampingadjustment rod 154 to be moved into and out of thetapered opening 156 at one end of afluid passageway 158 formed through the center ofpiston 80. As can be seen in FIG. 8, supplemental rebound flow path 144 passes through ableed hole 160 formed inshaft 78, passes along the channel formed betweentip 152 and taperedopening 156 and out offluid passageway 158. - During rebound, floating
piston 76 will move from the dashed line position to the solid line position of FIGS. 6 and 7. The friction created between floatingpiston 76 andadjustment rod 136 will causeflow restricting tip 134 ofrod 136 to be moved to the left in FIG. 7 thus effectively sealing taperedopening 132. In FIG. 6A there is a gap between the outer end ofrod 154 andadjustment screw 146. In practice the pressurization withingas chamber 74 will tend to forcerod 154 to the left in FIG. 6 thus causing the outer end of the rod to engageadjustment screw 146. Therefore, rebound flow path 144 remains open during compression as well as rebound. However, provision of path 144 has a pronounced effect on rebound damping but has little effect on compression damping because of the significantly different flow rates between the two. That is the reason why flow path 144 is considered a rebound flow path. - In the embodiment of FIGS.6-8
pressurized gas chamber 74 is shown aligned with and an extension ofcylinder 62. If desired it could be positioned in other areas and could be fluidly coupled through a flexible tube instead of a rigid connection. Also, floatingpiston 76 could be replaced by a diaphragm, bellows or other fluid force-transmitting barrier. - Any and all patents, applications, and printed publications referred to above are incorporated by reference.
Claims (32)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/916,093 US6415895B2 (en) | 1998-10-28 | 2001-07-26 | Position-sensitive shock absorber |
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US10638098P | 1998-10-29 | 1998-10-29 | |
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US09/916,093 US6415895B2 (en) | 1998-10-28 | 2001-07-26 | Position-sensitive shock absorber |
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US09/422,867 Division US6296092B1 (en) | 1998-10-28 | 1999-10-21 | Position-sensitive shock absorber |
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US09/916,093 Expired - Lifetime US6415895B2 (en) | 1998-10-28 | 2001-07-26 | Position-sensitive shock absorber |
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