Expansible chamber devices – Cylinder detail – With reinforcing member
Patent
1998-02-23
2000-04-18
Lopez, F. Daniel
Expansible chamber devices
Cylinder detail
With reinforcing member
60403, F01B 2516, F01B 1900
Patent
active
06050174&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a vacuum brake booster for motor vehicles with a booster shell comprising two opposing shell halves, with at least one moveable wall that subdivides the interior space of the booster shell, as well as with two transmission pins that extend in parallel to the longitudinal axis of the vacuum brake booster from one shell half to the shell half located on the other side of the moveable wall, with the shell halves being sealed against the moveable wall and having at their ends fastening elements for the body wall or a master brake cylinder, which is connected to the vacuum brake booster.
This type of vacuum brake booster is known from published German patent application DE 28 45 794. A disadvantageous characteristic of this known vacuum brake booster is its unfavorable deformation behavior during accidents that lead to distortion of the front section of the vehicle. This is caused by transmission pins which increase the stiffness of the booster shell, are of a relatively large diameter, and offer excessive resistance to deformation during accidents.
Consequently, the object of this invention is to propose measures specific to a vacuum brake booster of the type mentioned initially that allow for substantial improvement in deformation behavior during accidents.
SUMMARY OF THE INVENTION
Initially, this object is achieved by equipping the transmission pins with at least one predetermined breaking point.
A second solution of the underlying object of the invention consists in the transmission pins having at least one segment with a smaller cross-section.
Finally, a third solution of the underlying object of the invention consists in the fact that the transmission pins are designed as having two parts and that each transmission pin consists of two telescoping parts linked by a connecting piece that transmits both compressive and tensile forces and is detachable by application of pressure in excess of a predetermined value.
Additional attributes and advantages of the invention follow from the description of five illustrative examples based on the enclosed drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings,
FIG. 1 shows a first embodiment of the vacuum brake booster according to the invention.
FIGS. 2 to 5 show a second, a third, a fourth, and a fifth embodiment of the subject of the invention.
FIG. 6 shows the unlocking procedure for the electromagnetic locking mechanism acting between the two parts of the transmission pin depicted in FIG. 5.
FIG. 7 shows a sixth embodiment of the subject of the invention.
DETAILED DESCRIPTION OF THE DRAWINGS
The vacuum brake booster 1 according to invention depicted in the drawing includes a booster shell 2 formed by two interconnected shell halves 20, 21, with the half depicted on the left 20 in FIGS. 1 and 2 being connected to a master brake cylinder, which is not shown, while the shell half depicted on the right 21 is connected to the body wall a motor vehicle, which is also not shown in the figure. A control valve 9 positioned inside a timing case 8 which glides inside a floating ring seal 3 in a cylindrical extension of the right shell half 21 can be activated by an input element 4 linked to a brake pedal not depicted in the figure. At its ends facing away from the input element 4, the timing case 8 bears a moveable wall 5 which consists of a disk membrane 22 and an adjacent rolling membrane 23 and which divides the interior of the brake booster shell 2 into a vacuum chamber 6 capable of being evacuated and a working chamber 7, with the control valve 9 establishing the connection between the working chamber 7 and the vacuum chamber 6 or the atmosphere. Preferably, the control valve 9 consists of two concentrically positioned ring-shaped sealing seats 10, 11 that interact with a rotationally symmetrical elastic valve unit 12, such as a disk valve, or come into contact with the vacuum brake booster 1 when the latter is in its release position. The first sealing seat 1 which, when opened, allows for a connection
REFERENCES:
patent: 4256016 (1981-03-01), Thomas
patent: 4270438 (1981-06-01), Thomas et al.
patent: 5570622 (1996-11-01), Heinrichs et al.
patent: 5588349 (1996-12-01), Gautier et al.
Graichen Kai-Michael
Saalbach Kurt
Schonlau Jurgen
Wagner Wilfried
ITT Manufacturing Enterprises Inc.
Lopez F. Daniel
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