Pressure accumulator

Details Pressure accumulator Pressure accumulator

2000-04-14

2001-04-03

Brinson, Patrick (Department: 3752)

Pipes and tubular conduits

With pressure compensators

Variable capacity chambers

C138S026000, C220S721000

Reexamination Certificate

active

06209583

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an electronically controllable vehicle braking system for a motor vehicle with a cylinder/piston arrangement providing a brake fluid, which, by actuating a brake pedal, is caused to provide brake fluid acting on the brake of the motor vehicle, with the cylinder/piston arrangement being connectable with a pump arrangement and a pressure accumulator with the pressure accumulator having a housing which comprises a fluid connection for a fluid flowing into and out of the housing as well as a spring arrangement against whose force brake fluid flowing through the fluid connection is acting, characterised in that at least one part of the spring arrangement is formed by at least one part of the housing wall.
The invention also relates to a pressure accumulator, in particular for such an electronically controllable vehicle braking system. comprising a housing, a fluid connection for fluid flowing into and out of the housing, as well as a spring arrangement against whose force brake fluid flowing in through the fluid connection is acting.
From the state of the art pressure accumulators are known which are designed as gas piston accumulators, as gas diaphragm accumulators or as gas multilayer diaphragm accumulators or as spring piston accumulators. Such pressure accumulators are schematically depicted in
FIGS. 1
a
,
1
b
,
1
c
and
1
d
, respectively. In the variants shown in
FIGS. 1
a
to
1
d
the usable volume at 20° C. is identical. As is apparent, the respective size varies considerably. In addition, problems exist in the case of gas-filled pressure accumulators with respect to the temperature dependency and the tightness over the endurance performance. In the case of gas multilayer diaphragm accumulators, further drawbacks are their considerable weight and high costs. In the case of spring piston accumulators the problem exists in the wear of the seal between the cylinder and the piston.
BRIEF DESCRIPTION OF THE INVENTION
The invention is based on the object to provide a pressure accumulator, in particular for the initially mentioned vehicle braking system, which does not have these drawbacks.
In order to solve this problem, at least one part of the spring arrangement is formed by at least one part of the housing wall.
In this manner, a considerable weight saving is achieved on the one hand. On the other hand, the integration of two functions (storage of potential energy and enclosing of the fluid) in a single component enables a considerable simplification of the overall arrangement. Moreover, seals which can wear due to friction are avoided.
The part of the spring arrangement which forms a part of the housing wall is preferably at least sectionally formed by bellows, preferably consisting of metal.
In order to obtain a pressure level which is as high as possible, a further part of the spring arrangement acts parallel to the spring arrangement which is formed by a part of the housing wall, which is preferably arranged inside the housing. This further part of the spring arrangement can be designed as a coil, elastomer or spiral spring or as a disk spring pack. There is also, however, the possibility to arrange the further part of the spring arrangement outside of the housing, for example, surrounding the housing.
The further part of the spring arrangement is preferably formed by a spring element which pulls two rigid wall sections of the housing towards each other. For this purpose, the spring element is preferably designed as a compression spring. It is, however, also possible to design the spring element as a tension spring. If the spring element is designed as a compression spring, it is preferably clamped between a first housing wall and an intermediate wall which is connected with a second housing wall. The spring element thereby bears against the first housing wall via a bolt whose effective length is adjustable and which protrudes through the intermediate wall. Thereby, the intermediate wall is part of a sleeve which is connected with the second housing wall.
Further advantages, properties and possible modifications will become apparent from the following description of the figures.


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