Expansible chamber devices – Plural unitarily mounted cylinders or frame therefor – With casing or support for rotary shaft
Patent
1995-07-19
1998-11-24
Lopez, F. Daniel
Expansible chamber devices
Plural unitarily mounted cylinders or frame therefor
With casing or support for rotary shaft
92129, 92 84, 92148, 384536, 417273, 417313, 4174101, F01B 100
Patent
active
058393498
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to pumps, and more particularly relates to radial piston pumps, in particular of a high-pressure piston pump, and of a driving motor.
BACKGROUND OF THE INVENTION
Radial piston pumps are inter alia used in controlled brake systems of automotive vehicles, e.g., in order to prevent the wheels from locking (ABS) or spinning (anti-lock) during the process of braking or starting. Pumps used in ABS and anti-lock systems tend to be noisy, and the noise therefrom is particularly noticeable because these systems are activated relatively infrequently and their accompanying noises are often misinterpreted by the driver.
Referring to anti-lock-controlled and traction-slip-controlled brake systems, this is particularly true of the electric-motor-driven high-pressure pumps used with these systems where the noises of the high-pressure pump can make themselves noticed in a rather disagreeable manner.
There have been suggestions to provide the pump housing with an insulating coating or to encapsulate it in some other way so as to make it noiseproof. However, the cost of doing so along with the space needed by such a pump are considerable.
From DE-OS No. 38 08 901 it is further known to provide special silencing chambers for abating the pump noises. A further description of such radial piston pumps becomes evident from DE-OS No. 37 22 988.
SUMMARY OF THE INVENTION
It is an object of this invention to provide measures for the driving motor and the piston pump which will result in a noise abatement of the drive-and-pump unit.
This invention includes supporting at least one point of the shaft of the driving motor in the pump housing itself, with the bearing being arranged as near as possible to the range of impact of the drive shaft on the pump pistons. Due to the silencing action of the bearing this arrangement will reduce the transmission travel of the sound waves emanating from the range of impact of the shaft on the pump piston, at the same time the strain of the shaft over its length being reduced since the bearing and, thus, the pump housing absorb the forces of the pump pistons in the immediate vicinity of their range of impact.
A particularly simple embodiment introducing the shaft end of the driving motor into the bearing of the pump housing.
The absorption of the piston forces in the pump housing will be particularly efficient if antifriction bearings are used.
In a preferred embodiment the drive shaft is supported exclusively in the pump housing. This means that there is no bearing for the drive shaft in the housing of the driving motor so that there are no vibration-transmitting points of contact between the drive shaft and this housing. Such an arrangement is also referred to as free floating in the motor housing.
In developing this invention further, the outer bearing bush of at least one bearing is supported on the pump housing by way of a silencing layer in order to increase even further the pump noise silencing achieved by the absorption of the piston forces in the pump housing. In accordance therewith the forces taken up by the shaft are transmitted via the bearings in the pump housing and thence to the pump housing via a silencing layer. On the one hand, this silencing layer serves to reduce the force gradient, i.e., the change of the force active in the bearings per time unit, in that the bearings are elastically held in the pump housing. At the same time, however, the silencing layer also provides a stop to the sound transmission from the bearings into the pump housing.
A suitable way of fastening the silencing layer is by gluing or vulcanizing. In order to reduce the sound transmission from the shaft into the housing of the driving motor it is possible to support the shaft in the drive housing by means of but one sole bearing. It is possible to use the silencing layer described further above with this bearing of the driving motor.
An even increased abatement of the sound transmission from the pump into the motor housing is achievable by supporting the bearing p
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ITT Automotive Europe GmbH
Lewis J. Gordon
Lopez F. Daniel
Twomey Thomas N.
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