A brake booster for a brake system of a vehicle, having a first input piston component, and a valve body. The brake booster has a second input piston component, which is pushed away from the first input piston component in the braking direction using a compression spring, and a locking mechanism is embodied such that when the differential travel between the booster travel and the input travel is smaller than a predefined first limit value, the second input piston component is adjustable using the compression spring together with the valve body away from the first input piston component, and when the differential travel exceeds the first limit differential travel, the second input piston component is locked in place on the first input piston component.

A support element for positioning a first element, in particular a cover, on a second element, in particular a housing, includes an annular disk-shaped base body that can be positioned on a support rod fastened on the second element, the base body having on a first end face a support surface for making supporting contact with the first element, where the support element has, on the first end face, a plastically deformable projection forming the support surface.

An actuating unit for a brake booster of a vehicle is disclosed, the actuating unit having a housing and a force transmission module which is received displaceably in the housing. The force transmission module has a first force transmission element, a second force transmission element which is couplable or coupled to the first force transmission element so as to transmit force, a spring device which is couplable or coupled to the second force transmission element so as to transmit force and an actuating element which is couplable or coupled to the first force transmission element. The spring device is configured to exert a spring force on the first and/or second force transmission element such that the first and/or second force transmission element is able to be held at least temporarily in a predetermined initial position. The first and/or second force transmission element is adjustable from the initial position counter to the spring force of the spring device by an adjustment path by a force exerted and/or transmitted onto the first force transmission element. The force transmission module is configured to decouple the first force transmission element from the spring device after a defined adjustment path, as well as a brake booster, vehicle brake system and subassembly therefor.

A valve mechanism of this negative pressure type booster device has: a negative pressure valve seat provided on a valve body; an atmospheric valve seat provided on a plunger; and a valve part provided with a negative pressure valve section constituting a negative pressure valve together with the negative pressure valve seat and an atmospheric valve section constituting an atmospheric valve together with the atmospheric valve seat. The valve mechanism is provided with a tilting part which is provided on at least one of the valve body and the valve part and tilts the atmospheric valve section relative to a first plane formed when the negative pressure valve section and the negative pressure valve seat are brought into contact with each other to put the negative pressure valve in a closed state.

A valve mechanism of this negative pressure type booster device has: a negative pressure valve seat provided on a valve body; an atmospheric valve seat provided on a plunger; and a valve part provided with a negative pressure valve section constituting a negative pressure valve together with the negative pressure valve seat and an atmospheric valve section constituting an atmospheric valve together with the atmospheric valve seat. The valve mechanism is provided with a tilting part which is provided on at least one of the valve body and the valve part and tilts the atmospheric valve section relative to a first plane formed when the negative pressure valve section and the negative pressure valve seat are brought into contact with each other to put the negative pressure valve in a closed state.

A vehicle driving device includes: an engine; a brake booster including a negative pressure chamber, the brake booster amplifying a brake pressure by a negative pressure determined corresponding to a pressure inside the negative pressure chamber; a power transmission clutch disposed between the engine and a driving wheel; and a negative pressure pump configured to drive by using at least one of a torque from the engine and a torque from the driving wheel, the negative pressure pump being configured to vary the negative pressure inside the negative pressure chamber. In the vehicle driving device included in a vehicle that performs freewheeling in a state where the power transmission clutch is released and the engine is stopped, the negative pressure pump includes a control chamber configured to reduce a capacity of the negative pressure pump as a magnitude of the negative pressure inside the negative pressure chamber increases.

A vehicle driving device includes: an engine; a brake booster including a negative pressure chamber, the brake booster amplifying a brake pressure by a negative pressure determined corresponding to a pressure inside the negative pressure chamber; a power transmission clutch disposed between the engine and a driving wheel; and a negative pressure pump configured to drive by using at least one of a torque from the engine and a torque from the driving wheel, the negative pressure pump being configured to vary the negative pressure inside the negative pressure chamber. In the vehicle driving device included in a vehicle that performs freewheeling in a state where the power transmission clutch is released and the engine is stopped, the negative pressure pump includes a control chamber configured to reduce a capacity of the negative pressure pump as a magnitude of the negative pressure inside the negative pressure chamber increases.

A brake booster for a braking system of a vehicle including: a valve body to which a booster force is transmittable, a reaction disk, and an output rod, situated on the reaction disk in such a way that the booster force is at least partially transmittable to the output rod via the reaction disk so that the output rod is displaceable in the braking direction, the output rod being pressable counter to the braking direction due to a counter force of a master brake cylinder of the braking system, and the valve body and/or the output rod being formed in such a way that a relative movement of the output rod, aligned counter to the braking direction with respect to the valve body, is limited by an impact of at least one first contact surface of the output rod on at least one second contact surface of the valve body.

A brake booster for a braking system of a vehicle including: a valve body to which a booster force is transmittable, a reaction disk, and an output rod, situated on the reaction disk in such a way that the booster force is at least partially transmittable to the output rod via the reaction disk so that the output rod is displaceable in the braking direction, the output rod being pressable counter to the braking direction due to a counter force of a master brake cylinder of the braking system, and the valve body and/or the output rod being formed in such a way that a relative movement of the output rod, aligned counter to the braking direction with respect to the valve body, is limited by an impact of at least one first contact surface of the output rod on at least one second contact surface of the valve body.

A vehicle braking system includes an assistance device having a vacuum pump driven by an engine for communicating vacuum to a chamber of the assistance device. A control valve is interposed along a fluid line between the pump and the chamber. The control valve is in its first operative condition, where the inlet side of the vacuum pump communicates with the chamber, when pressure within the chamber is above a predetermined value; and is in its second operative condition, where the inlet side of the vacuum pump communicates with the atmosphere, when pressure within the chamber is below a predetermined value. In this second condition the pump intakes air from and feeds air into the atmosphere, thereby reducing the energy consumption by the engine required for driving the pump during stages where, within the chamber, there is a vacuum sufficient for the regular operation of the braking system.