GB2285664A

GB2285664A - Hydraulic brake system

Info

Publication number: GB2285664A
Application number: GB9400006A
Authority: GB
Inventors: Rui Yang Hsiao; Ping Hui Hsiao
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-24
Filing date: 1994-01-04
Publication date: 1995-07-19
Anticipated expiration: 2014-01-04
Also published as: GB2285664B; FR2701910A3; FR2701910B3; GB9400006D0

Description

2285664 Hydraulic 13rake Sys-Ee This invention relates to a hydraulic

brake system.

Vehicles are increasingly important f or transportation in modern societies. Hydraulic brakes are commonly used by vehicles for safety, however, these brakes sometimes fail. The major reason for the failure of hydraulic brakes is theleakage of hydraulic medium.

To solve the above-mentioned problem, there has been a hydraulic brake system consisting of a first hydraulic brake assembly and a second hydraulic brake assembly. The first hydraulic brake assembly is actuatable by pressing a first pedal, and the second hydraulic brake assembly is actuatable by pressing a second pedal. In normal conditions, the first pedal is pressed for actuating the first hydraulic brake assembly. When the first hydraulic brake assembly fails, the second pedal has to be pressed in order to actuate the second hydraulic brake assembly. However, it takes time to. realize that the first brake assembly has failed. It also takes time to move one of a driver's feet from the first pedal to the second pedal. It takes further time to press the second pedal. During such a period of time, vehicles might have traveled far enough to cause accidents. That is, such an approach does not provide sufficient safety. Therefore, this invention is intended to solve the abovementioned problem.

It is an object of this invention to provide a hydraulic brake' system employing two hydraulic brake assemblies. The first hydraulic brake assembly includes a f irst master hydraulic cylinder f or actuating a number of brakes. The second hydraulic brake assembly includes a second master hydraulic cylinder for actuating a number of brakes. The first master hydraulic cylinder has a first mandrel extending therefrom. The second master hydraulic cylinder has a second mandrel extending therefrom. A.pedal. links to a first rod extending from a pump from which a second rod also extends. The second-rod links to the first and second mandrels. Thus, the first and second hydraulic brake assemblies are simultaneously actuated when the pedal is pressed. In the case that one of the hydraulic brake assemblies fails, the remaining of the hydraulic brake assemblies still functions for braking.

For a better understanding of this invention and objects thereof, a study of the detailed description of the embodiments described hereinafter should be made in relation to the accompanying drawings.

In the drawings:

Figure I is a schematic view of a hydraulic brake system in accordance with the preferred embodiment of this invention; Figure 2 is a perspective view of a driving device used in a hydraulic brake system in accordance with the preferred embodiment of this invention; and Figure 3 is a perspective view of a brake incorporated in a hydraulic brake system in accordance with the preferred embodiment of this invention.

This invention will be described in detail with i reference to the drawings showing the preferred embodiment thereof.

Referring to Figures 1 and 2, a hydraulic brake system has a pedal 80 pivotally mounted in a car (not shown) for actuating the hydraulic brake system when pressed.

A pump 10 having a first rod 11 and a second rod (not shown) extending in opposite directions therefrom is used for increasing hydraulic pressure for braking. Details of the pump 10 will not be given as being conventional. The pump 10 is firmly mounted in the car while the first rod 11 and the second rod are permitted to slide relative thereto. The first rod 11 operatively links to the pedal 80 so that the first rod 11 is pushed into the pump 10 when the pedal 80 is pressed. As the first rod 11 is pushed into the pump 10, the second rod 12 is pushed out of the pump 10.

The second rod is sited between two guides 12 and 13. The guides 12 and 13 connect the pump 10 with a plate 20. The tip of the second rod connects with a middle point of a bar 14. The guides 12 and 13 ensures that the second rod and the bar 14 slide without rotating.

The bar 14 has a first end linking to a first mandrel 15 extending from a first master hydraulic cylinder 21 and a second end linking to a second mandrel 16 extending from a second master hydraulic cylinder 22. The plate 20 defines two holes through which the first mandrel 15 and the second mandrel 16 respectively extend. The first master hydraulic cylinder 21 and the second master hydraulic cylinder 22 are firmly mounted on the plate 20. The first master hydraulic 1 cylinder 21 communicates a first reservoir 26 and a second reservoir 27 respectively with a first pipe 23 and a second pipe 24. The first pipe 23 leads to the brakes 30 and the second pipe 24 leads to the brakes 40. The second iftaster' hydraulic cylinder 22 communicates a third reservoir 28 with a third pipe 25 leading to two brakes 30 for two front wheels (not shown) and two brakes 40 for two rear wheels (not shown).

Generally, the brakes 30 are disk brakes, and the brakes 40 are drum brakes. However, the brakes 30 and 40 can both be disk brakes or drum brakes.

Referring to Figure 3, each of the brakes 30 has one first minor hydraulic cylinder 50 communicating with the first pipe 23. The first minor hydraulic cylinder 50 can actuate one lining 51 for engaging with the disk 70. - Each of the brakes 30 also has one second minor hydraulic cylinder 60 communicating with the third pipe 25. The second minor hydraulic cylinder 60 can actuate one lining 61 for engaging with a disk 70 firmly linkihg to a corresponding one of the front wheels.

As well known, the first pipe 23, the second pipe 24 and the third pipe 25 are filled with hydraulic medium. When the pedal 80 is pressed, by means of the pump 10, more hydraulic medium is urged from the first reservoir 26 to the first minor hydraulic cylinders 50 through the first pipe 23 for driving the linings 51 to engage with the two disks 70.. At that instant, more hydraulic medium is urged from the third reservoir 28 to the second minor hydraulic cylinders through the third pipe 25 for driving the linings 61 to engage with the disks 70.

As stated above, the hydraulic brake system according to the preferred embodiment of the present invention employs two hydraulic brake assemblies. The first hydraulic brake. assembly includes the first master hydraulic cylinder 21, the first reservoir 26, the second reservoir 27, thefirst pipe 23, the second pipe 24. the brakes 30 and the brakes 40. The second hydraulic brake assembly includes the second master hydraulic cylinder 22, the third reservoir 28, the third pipe 25, the brakes 30 and the brakes 40. In he case that one of the hydraulic brake assemblies fails, the remaining of the hydraulic brake assemblies still functions normally for braking. Thus, the hydraulic brake system in accordance with the present invention provides more security than conventional hydraulic brake systems.

While this invention has been explained in relation to its preferred embodiment, it is to be understood-that. variations thereof will be apparent to those skilled in the art upon reading.this specification. Therefore, this invention is intended to cover all such variations as shall fall within the scope of the appended claims.

Claims

CLAIMS:

1. A master hydraulic brake system comprising: a pump comprising a first rod and a second rod extending in opposite directions therefrom, said first rod operatively linking to a pedal pivotally mounted in a vehicle, said second rod operatively linking to a bar; two guides connecting said pump with a plate, and sandwiching said second rod so that said first rod and said bar slide without rotating; a first master hydraulic cylinder linking to said plate and comprising a first mandrel penetrating said 'Plate and linking to said bar, said first master hydraulic cylinder driving a number of brakes; and a second master hydraulic cylinder linking to said plate and comprising a second mandrel penetrating said plate and linking to said bar, said second master hydraulic cylinder driving a number of brakes.