A portal gear box assembly for an all-terrain vehicle includes a sealed portal gear box housing having an interior housing space that contains a set of gears for linking an axle to an output shaft. An expandable space is in fluid communication with the interior housing space, and is adapted to allow pressurized fluid contained in the interior housing space to flow into the expandable space, thus expanding the volume of the expandable space and reducing the pressure within the interior housing space. The expandable space may be provided in the form of a bellows whose volume can be changed by expansion or contraction of a fluid contained therein. A fluid is contained within the portal gear box housing and within the expandable space.

The expandable space may be mounted externally to the portal gear box housing, and may be connected to the portal gear box housing by a conduit effective for allowing fluid to pass between the portal gear box housing and the expandable space. The expandable space and its connecting conduit are effective for allowing air to flow from within the portal gear box housing to the expandable space when an increased air pressure within the portal gear box is encountered, thus mitigating against a build-up of air pressure within the portal gear box housing.

All-terrain vehicle systems and methods configured for attachable tools and implements are disclosed. An example embodiment includes: an All-Terrain Vehicle (ATV) frame configured with a void; a modular Power Take-Off (PTO) system removably installable in the ATV frame in the void; and a cargo bed removably installable at a rear portion of the ATV frame.

All-terrain vehicle systems and methods configured for attachable tools and implements are disclosed. An example embodiment includes: an All-Terrain Vehicle (ATV) frame configured with a void; a modular Power Take-Off (PTO) system removably installable in the ATV frame in the void; and a cargo bed removably installable at a rear portion of the ATV frame.

Steering and roll control systems to counteract yaw and/or roll forces during operation of a vehicle having first and second wheeled members coupled together by an articulating joint mechanism that is configured to pivot in a yaw direction and/or a roll direction. The steering assistance systems include a biasing unit configured to apply a counteracting force to bias the first and second wheeled members toward a straight-line arrangement thereof. The roll control systems include an additional biasing unit configured to apply a counteracting force to bias the first and second wheeled members toward a level alignment arrangement of the vehicle.

Steering and roll control systems to counteract yaw and/or roll forces during operation of a vehicle having first and second wheeled members coupled together by an articulating joint mechanism that is configured to pivot in a yaw direction and/or a roll direction. The steering assistance systems include a biasing unit configured to apply a counteracting force to bias the first and second wheeled members toward a straight-line arrangement thereof. The roll control systems include an additional biasing unit configured to apply a counteracting force to bias the first and second wheeled members toward a level alignment arrangement of the vehicle.

Embodiments include an off-road vehicle with a straddle seat, a plurality of ground engaging members, a prime mover and a frame having a removable frame portion overlying the prime mover, wherein at least a portion of the engine extends above at least a portion of the removable frame portion, and wherein at least a portion of the straddle seat extends over the removable frame portion and the prime mover.

A vehicle includes a body frame including an upper frame, a front frame, and a rear frame. On a front-wheel side, a first end of a shock absorber of a suspension and a stabilizer are supported by the body frame via a bracket adjacent to a connection between the upper frame and the front frame. On a rear-wheel side, a first end of a shock absorber of a suspension and a stabilizer are supported by the body frame via a bracket adjacent to a connection between the upper frame and the rear frame.

A vehicle includes a body frame including an upper frame, a front frame, and a rear frame. On a front-wheel side, a first end of a shock absorber of a suspension and a stabilizer are supported by the body frame via a bracket adjacent to a connection between the upper frame and the front frame. On a rear-wheel side, a first end of a shock absorber of a suspension and a stabilizer are supported by the body frame via a bracket adjacent to a connection between the upper frame and the rear frame.

A utility vehicle includes an electric powertrain assembly. The electric powertrain assembly includes at least a battery and a motor for controlling torque at various ground-engaging members of the vehicle. The configuration of the electric powertrain assembly allows for increased storage on the utility vehicle.

A utility vehicle includes an electric powertrain assembly. The electric powertrain assembly includes at least a battery and a motor for controlling torque at various ground-engaging members of the vehicle. The configuration of the electric powertrain assembly allows for increased storage on the utility vehicle.