# US 8,543,291 B2 · Hydraulic wheel suspension system for a 3-wheeled motorcycle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,543,291 B2 - Document ID: US8543291B2 - Status: Granted - Kind: B2 - Application number: 13/723,702 - Filed: 2012-12-21 - Published: 2013-08-15 - Granted: 2013-09-24 - Earliest claimed: 2012-02-10 - Applicants: Steven P Young - Inventors: Steven P Young - Web page: https://patentgrep.com/patent/US8543291B2 ## CPC - B62K 5/027: Motorcycles with three wheels (specially adapted for disabled riders B62K5/023) - B60G 13/08: hydraulic - B60G 17/0162: {mainly during a motion involving steering operation, e.g. cornering, overtaking (B60G17/0164 takes precedence)} - B60G 21/073: between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected - B62J 15/02: Fastening means; Stays - B62K 5/10: with means for inwardly inclining the vehicle body on bends - B60G 2300/122: Trikes - B60G 2300/45: Rolling frame vehicles - B60K 17/356: having fluid or electric motor, for driving one or more wheels - B60W 2300/156: Ridable lawn mowers - B60W 2510/20: Steering systems - B60Y 2200/223: Ridable lawn mowers - B62K: CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) - B62J: CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT - B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY ## Abstract A wheel suspension system for a three-wheeled motorcycle or “trike” includes parallel wheels mounted on vertically pivoting suspension arms governed by hydraulic pistons. The pistons have upper liquid reservoirs that are interconnected through a valve system, which interconnects the upper reservoirs when the trike is in motion, allowing opposing vertical wheel movements when banking through turns, and prevents liquid exchange when the trike is stopped, thereby holding the motorcycle upright, Embodiments include a manual and/or automatic valve control. A threshold switching speed for an automatic controller can be factory set and/or user adjustable. The pistons can include directly interconnected lower fluid reservoirs. A shock-absorbing reservoir can allow transient vertical movement of both wheels to absorb shocks. A cover system can emulate the appearance of saddle bags and can appear to be covering only a single wheel. ## Claims ### Claim 1 A suspension system for controlling vertical movements of two side-by-side parallel wheels of a three-wheeled motor vehicle, the suspension system comprising: a pair of suspension arms, each suspension arm having a proximal end pivotally attached to a frame of the vehicle, so that the suspension arm can pivot vertically about its proximal end, and each suspension arm having a distal end to which one of the parallel wheels is rotatably attached; a pair of variable length control rod assemblies, each control rod assembly having a proximal end attached to the frame of the vehicle and a distal end attached to a corresponding suspension arm, so that pivoting of the suspension arm requires changes in length of the control arm assembly; a pair of hydraulic piston mechanisms cooperative with the control arm assemblies, so that changing a control arm assembly's length requires moving a piston within the corresponding piston mechanism, each hydraulic piston mechanism having an upper liquid reservoir above its piston; a valve system in liquid communication with the upper liquid reservoirs of the piston mechanisms, the valve system having an operating state in which hydraulic fluid is allowed to flow between the upper reservoirs, the valve system having a stationary state that prevents changes to the amounts of hydraulic fluid in the upper reservoirs; and a controller in controlling communication with the valve system, the controller being able to transition the valve system between the operating state and the stationary state. ### Claim 2 (depends on 1) The suspension system of claim 1, wherein the controller is manually operated. ### Claim 3 (depends on 1) The suspensions system of claim 1, wherein the controller is able to automatically transition the valve system to the operating state when the vehicle is traveling at a speed above a threshold speed, and automatically transition the valve system to the stationary state when the vehicle is traveling below the threshold speed. ### Claim 4 (depends on 3) The suspension system of claim 3, wherein the threshold speed is between one mile per hour and fifteen miles per hour. ### Claim 5 (depends on 3) The suspension system of claim 3, wherein the threshold speed is pre-set. ### Claim 6 (depends on 3) The suspension system of claim 3, wherein the threshold speed can be adjusted by an operator. ### Claim 7 (depends on 3) The suspension system of claim 3, further comprising a manual control configured to allow manual switching of the valve system between the operating state and the stationary state. ### Claim 8 (depends on 1) The suspension system of claim 1, further comprising a lower liquid reservoir below each piston, the two lower reservoirs being in direct liquid communication with each other, so that hydraulic fluid leaving one lower reservoir is forced to enter the other lower reservoir. ### Claim 9 (depends on 1) The suspension system of claim 1, wherein the suspension system can be retro-fit to an existing two-wheel motorcycle. ### Claim 10 (depends on 9) The suspension system of claim 9, wherein the suspension system can be pre-assembled before attachment to the existing two-wheel motorcycle. ### Claim 11 (depends on 10) The suspension system of claim 10, wherein the pre-assembled suspension system can be attached in place of a rear motorcycle wheel to a frame of the existing two-wheel motorcycle by one or more attachment brackets. ### Claim 12 (depends on 1) The suspension system of claim 1, wherein the controller includes a microprocessor. ### Claim 13 (depends on 1) The suspension system of claim 1, further comprising a hydraulic shock absorber in liquid communication with the valve system, the hydraulic shock absorber being configured when the valve system is in the operating state to exchange hydraulic fluid with the connected upper reservoirs, whereby a liquid pressure of the upper reservoirs is increased when hydraulic fluid flows from the upper reservoirs into the hydraulic shock absorber, and decreased when hydraulic fluid flows from the hydraulic shock absorbers into the upper reservoirs. ### Claim 14 (depends on 13) The suspension system of claim 13, wherein the hydraulic shock absorber includes a piston located between a shock absorber liquid reservoir and a spring, so that an increase of liquid in the shock absorber liquid reservoir moves the piston and compresses the spring. ### Claim 15 (depends on 1) The suspension system of claim 1, further comprising a wheel cover system that is configured to partially cover the two parallel wheels and to create a visual impression that the cover is covering a single wheel instead of covering two parallel wheels. ### Claim 16 (depends on 15) The suspension system of claim 15, wherein the wheel cover system presents an appearance of a saddlebag storage system. ### Claim 17 (depends on 15) The suspension system of claim 15, further comprising a central feature that emulates an appearance of a wheel guard that would cover a single rear wheel of a 2-wheel motorcycle.