Vehicle brake system having a brake pedal unit
A technology of brake pedal and input piston, which is applied in the direction of brake transmission device, brake action activation device, hydraulic brake transmission device, etc., and can solve undesired problems
Pending Publication Date: 2020-08-07
ZF主动安全美国股份公司
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
While the brake pedal unit 10 may be suitable for use in trucks or larger vehicles, it may not be desirable for smaller passenger vehicles.
Method used
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Embodiment Construction
[0028] Referring now to the accompanying drawings, figure 2 An embodiment of a vehicle braking system (generally designated 100) is schematically shown. The braking system 100 is a hydraulically assisted braking system in which booster fluid pressure is utilized to apply a braking force to the braking system 100 . The braking system 100 may suitably be used on a ground vehicle, such as a motor vehicle having four wheels and a wheel brake associated with each wheel. Additionally, the braking system 100 may be provided with other braking functions, such as anti-lock braking (ABS) and other anti-skid control features, to effectively brake the vehicle, as discussed below. The components of braking system 100 may be housed in one or more blocks or housings. The block or housing may be made of a solid material, such as aluminum, that has been drilled, machined, or otherwise formed to accommodate the various components. Fluid conduits can also be formed in blocks or housings.
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A brake pedal unit includes a housing defining a bore formed therein. An input piston is slidably disposed in the bore. The input piston is connected to a brake pedal such that engagement of the brakepedal causes movement of the input piston within the bore of the housing of the brake pedal unit. The brake pedal unit is defined to be in an at rest position when the brake pedal in not engaged causing movement of the input piston. A primary piston is slidably disposed in the bore for pressurizing a primary chamber. A primary passageway permits fluid communication between the primary chamber andthe reservoir, wherein fluid flow through the primary passageway is blocked when the brake pedal unit is in the rest position. A secondary piston is slidably disposed in the bore for pressurizing a secondary chamber. A secondary passageway permits fluid communication between the secondary chamber and the reservoir, wherein fluid flow through the secondary passageway is blocked when the brake pedal unit is in the rest position.
Description
[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of US Provisional Application No. 62 / 592,929, filed November 30, 2017, the disclosure of which is incorporated herein by reference. [0003] Background of the Invention [0004] The present invention generally relates to vehicle braking systems. Vehicles typically use hydraulic braking systems to slow and stop. The complexity of these systems varies, but a basic braking system typically includes a brake pedal, a tandem master cylinder, fluid conduits arranged in two similar but separate brake circuits, and wheels in each circuit brake. The driver of the vehicle operates a brake pedal connected to the master cylinder. When the brake pedal is depressed, the master cylinder generates hydraulic pressure in both brake circuits by pressurizing the brake fluid. Pressurized fluid travels through the fluid conduits in these two circuits to actuate the brake cylinders at the wheels, thereby de...
Claims
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IPC IPC(8): B60T13/14B60T8/40B60T11/236B60T7/04
CPCB60T7/042B60T8/40B60T11/16B60T11/232B60T11/236B60T13/146B60T13/662B60T13/686B60T13/745B60T8/38B60T8/4018B60T8/4081B60T13/12B60T13/145B60T13/62B60T2270/82
Inventor B·J·甘泽尔
Owner ZF主动安全美国股份公司