Bombardier Recreational Products Inc.

Bombardier Inc.

Brp-rotax Gmbh & Co Kg

Sylvain Matte

Rudolf Kusel

Anton Pichler

Michel Lefebvre

Louis Lefebvre

Mathieu Gauthier

Gaetan Lecours

Gerd Ohrnberger

Max Richer

Jean-Sebastien Pard

Bruno Schuehmacher

Johann Holzleitner

Eric Bouffard

Kurt Wildfellner

Andreas Haydl

Josef Stockhammer

Bruno Schuemacher

Andreas Winter

A drive pulley for a continuously variable transmission has a fixed sheave, a movable sheave, and a biasing member. At least one arm is pivotally connected about a first axis to one of the movable sheave and a portion of the drive pulley axially and rotationally fixed to the fixed sheave. The arm has a ramp surface. At least one slider is pivotally connected about a second axis to the other one of the movable sheave and the portion of the drive pulley. The at least one slider has at least three slider surfaces. At least one of the at least three slider surfaces is adapted to contact the ramp surface of the at least one arm.

Continuously variable transmission drive pulley

A snowmobile has a frame with an engine compartment and a tunnel, a front suspension, at least one ski, an engine, a bracket having a first portion joined to the engine and a second portion having an aperture defined therein, an output shaft, a countershaft passing through the aperture, a motion decoupler disposed around the countershaft and being supported by the second portion of the bracket, the countershaft being rotationally supported in the motion decoupler, a driving pulley disposed on the output shaft, a driven pulley disposed on the countershaft, a drive belt looped around the driving and driven pulleys, and an endless drive track. The driving pulley, the driven pulley and the drive belt together form a continuously variable transmission.

Continuously variable transmission mounting assembly

A snowmobile has a frame with an engine compartment and a tunnel, a front suspension, at least one ski, an engine, a bracket having a first portion joined to the engine and a second portion having an aperture defined therein, an output shaft, a countershaft passing through the aperture and being supported by the second portion of the bracket, a motion decoupler disposed in the aperture around the countershaft, the countershaft being rotationally supported in the motion decoupler, a driving pulley disposed on the output shaft, a driven pulley disposed on the countershaft, a drive belt looped around the driving and driven pulleys, and an endless drive track. The driving pulley, the driven pulley and the drive belt together form a continuously variable transmission.

A snowmobile is provided that includes a frame, an engine, an endless belt drive system, and an air intake system for the engine. The frame has a forward portion and an aft portion. The engine is mounted to the forward portion and the belt drive system is mounted to the aft portion and is operatively connected to the engine. The engine is a turbocharged four-stroke type engine.

Snowmobile with a turbocharged four-stroke engine

A snowmobile with arrangement of a four cycle engine is disclosed providing a relatively low center of gravity for improved handling and maneuverability. The engine comprises a cylinder unit slanted to the back of the snowmobile and an improved packaging of auxiliary components in order to optimize the location of the center of gravity on the snowmobile. The engine has a balancer shaft rotatably coupled to the crankshaft and the balancer shaft axis is positioned above the crankshaft axis.

Engine arrangement for a snowmobile

A four cycle engine having at least one cylinder unit is disclosed. The engine includes a continuously variable transmission (CVT) connected to the engine on one side of the engine. An air box is also provided that is located on the same side of the engine as the CVT. The engine further includes an intake manifold operatively connected to the air box for connecting the air box to each cylinder unit and a throttle assembly operatively connected to air box and the intake manifold. The intake manifold may have a generally Y-shaped manifold having a connector leg connected to the throttle assembly and a pair of branches. One branch is operatively connected to one of the cylinder units and another branch is connected to another of the cylinder units. The connector leg is generally parallel to the axis of the crankshaft. The intake manifold may further include a baffle assembly, which directs gas flow within the intake manifold.

Induction system for a four cycle engine

An arrangement of a four cycle engine is disclosed for use in a vehicle providing a relatively low center of gravity for improved handling and maneuverability. The engine components are located on opposing sides of the longitudinal axis of the vehicle and behind the axis of the crankshaft to move the center of gravity to the middle of the vehicle.

Engine arrangement for a four cycle engine

A dry sump lubrication system for a four cycle engine is disclosed. The dry sump lubrication system has at least two lubricant storage chambers. A first lubricant storage chamber stores a first volume of lubricant. The first lubricant storage chamber may be located in a lower part of the crankcase. A second lubricant storage chamber is an oil tank and stores a second volume of lubricant. The oil tank may be secured to the output end of the crankcase. The first lubricant storage chamber is capable of storing at least 30% of a total volume of lubricant within the dry sump lubrication system.

Lubrication system for a four cycle engine

A valve assembly located adjacent the cylinder structure of a two-stroke engine including a valve piston, a diaphragm and a restricting member. The valve assembly is adapted to vary the height of the exhaust port of this type of engine by moving a restricting member, located in a guide channel communicating with the exhaust port, from a full-flow height position to a restrictive height position (and vice versa). The force necessary to actuate the restricting member is a pressurized medium or a vacuum. A solenoid valve controls the pressurized medium or vacuum delivery to the valve assembly according to the engine speed N and throttle opening for optimum efficiency.

Valve assembly using pressurized medium for controlling operating conditions of a two-stroke engine

The air/fuel mixture ratio supplied to an internal combustion engine of a vehicle is modified to achieve a constant mass flow rate in spite of changes in atmospheric temperature and pressure conditions by employing an electronic compensation system. The system has sensors which detect air temperature and barometric pressure, from which signals are developed controlling the float bowl pressure in the engine carburettors, thus modifying the air/fuel mixture ratio as desired. The system also includes provision for enriching the fuel content of the mixture supplied to the engine to provide an oversupply of fuel in cold start situations.

Electronic compensation system

The invention relates to a variable venturi for a watercraft vehicle or similarly powered vehicle which allows the operator of the vehicle to selectively choose to operate a watercraft vehicle for achieving maximum acceleration or, alternatively, maximum top end speed. The venturi is comprised of a collar surrounding the venturi adjacent to a distal end of the venturi. At such time as the collar is activated, exposing the water flow exiting the venturi to atmospheric pressure, the diameter of the water flow exiting the venturi is reduced by approximately 1.0 mm. to 1.5 mm. in radius. This slight change in the surface area of the water flow provides a lower mass flow of the exiting water with an increased velocity of the water and top speed of the vehicle. Alternatively, a larger diameter venturi provides a higher mass flow with a decreased velocity and maximum acceleration. In a preferred embodiment, the vehicle comprises a means for allowing the rotation of the engine or the pressure of the water flow to activate an actuator means for altering the surface area of the water exiting the venturi. The preferred embodiment is comparable to automatic shifting of a transmission for a conventional land vehicle. In an alternative embodiment, the collar may be manually controlled by an operator of the vehicle to modify the surface area of the water flow exiting the venturi, thereby allowing the vehicle to achieve maximum acceleration.

Variable venturi

In an exhaust expansion chamber or tuned pipe of a two-cycle engine in a watercraft, variable amounts of water are injected, thus cooling the temperature within the expansion chamber and matching the sonic wave speed with that of the correct rpm of the motor. Thus, by regulating the temperature of the exhaust gases in the tuned pipe with water, the efficiency of the two-cycle engine at varying revolutions per minute, is improved.

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St-Denis de Brompton, Canada

Sylvain Matte