A brake booster is provided. The brake booster includes a poppet valve body configured to open a path for atmospheric pressure to be introduced into a variable pressure chamber by an operation rod linked with a brake pedal, and a return spring structure disposed on an outer side of the poppet valve body and configured to adjust an elastic force provided to the poppet valve body when an input of the brake pedal is released.

A brake booster is provided. The brake booster includes a poppet valve body configured to open a path for atmospheric pressure to be introduced into a variable pressure chamber by an operation rod linked with a brake pedal, and a return spring structure disposed on an outer side of the poppet valve body and configured to adjust an elastic force provided to the poppet valve body when an input of the brake pedal is released.

A method of controlling an aspirator valve of a vacuum assisted braking system that rapidly fully opens and closes the aspirator valve when an engine of a motor vehicle has been shut-down and the current conditions indicate that ice is likely to have formed in the aspirator valve. The rapid opening and closing of the aspirator valve breaks up any ice buildup thereby de-icing the aspirator valve and allowing normal aspirator valve operation.

A manually adjustable aspirator is disclosed for use in a vacuum system for a vehicle having a vacuum source. The aspirator includes a passageway having a diameter that can be adjusted by a vehicle operator for different altitudes. The aspirator includes a body, a passageway having a narrowed aperture defined by opposed cones, and a manually adjustable flow adjuster having an adjustment knob. A brake booster is connected to the aspirator. An air intake is connected with a vacuum source and the aspirator. The cones include first and second cones each having a narrowed end. The narrowed ends are joined at a narrow aperture that defines an inner diameter. The flow rate adjuster regulates the size of the inner diameter. Adjustment of the knob allows operator selection between a high boost in a high altitude location and a low boost in a low altitude location having a higher source vacuum.

A manually adjustable aspirator is disclosed for use in a vacuum system for a vehicle having a vacuum source. The aspirator includes a passageway having a diameter that can be adjusted by a vehicle operator for different altitudes. The aspirator includes a body, a passageway having a narrowed aperture defined by opposed cones, and a manually adjustable flow adjuster having an adjustment knob. A brake booster is connected to the aspirator. An air intake is connected with a vacuum source and the aspirator. The cones include first and second cones each having a narrowed end. The narrowed ends are joined at a narrow aperture that defines an inner diameter. The flow rate adjuster regulates the size of the inner diameter. Adjustment of the knob allows operator selection between a high boost in a high altitude location and a low boost in a low altitude location having a higher source vacuum.

A pneumatic booster capable of suppressing braking force from becoming excessive relative to an input force applied to a brake pedal. A valve mechanism (13) includes a poppet valve (14) movably attached to a small-diameter cylindrical portion of a valve body (6), an annular abutment portion formed on a plunger body of a plunger (20) to bring a variable-pressure chamber B into and out of communication with the atmosphere by unseating from and seating on the poppet valve, respectively, a movable seat member (29) movably guided by the valve body to bring a negative-pressure chamber A and the variable-pressure chamber B into and out of communication with each other, and a transmitting member (31) having one end abutting against the movable seat member and the other end disposed to surround a stepped piston of the plunger so as to be abuttable against a reaction disk (27).

A pneumatic booster capable of suppressing braking force from becoming excessive relative to an input force applied to a brake pedal. A valve mechanism (13) includes a poppet valve (14) movably attached to a small-diameter cylindrical portion of a valve body (6), an annular abutment portion formed on a plunger body of a plunger (20) to bring a variable-pressure chamber B into and out of communication with the atmosphere by unseating from and seating on the poppet valve, respectively, a movable seat member (29) movably guided by the valve body to bring a negative-pressure chamber A and the variable-pressure chamber B into and out of communication with each other, and a transmitting member (31) having one end abutting against the movable seat member and the other end disposed to surround a stepped piston of the plunger so as to be abuttable against a reaction disk (27).

A device for varying a pedal resistance of a hydraulic brake system includes at least one electroactive polymer actuator. The device further includes a reaction disc. The reaction disc has at least two polymer actuators. The at least two polymer actuators are independently controllable. Additionally, the at least two polymer actuators are arranged coaxially relative to one another.

Methods and systems are provided for providing vacuum to a brake booster via an aspirator system. In one example, a system may include an aspirator system fluidly coupled with a brake booster with no intervening components located therebetween.

Methods and systems are provided for providing vacuum to a brake booster via an aspirator system. In one example, a system may include an aspirator system fluidly coupled with a brake booster with no intervening components located therebetween.