192 clutches and power-stop control – Transmission and brake – Motor vehicle
Reexamination Certificate
1999-11-29
2001-11-20
Oberleitner, Robert J. (Department: 3613)
192 clutches and power-stop control
Transmission and brake
Motor vehicle
C188S071100, C074S607000
Reexamination Certificate
active
06318535
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention resides in an arrangement for transferring braking torques particularly in commercial vehicles with a drive axle including a differential transmission having a driving pinion and two drive shafts and a braking device associated with the differential transmission.
In an arrangement of this type known in the art, the brake torque is generated by a cone wheel mounted in the axle housing and driven by the differential transmission. The cone wheel is engaged by a brake drum, which is axially movably in the differential transmission housing into engagement with the cone wheel for frictional engagement therewith (DE 828 639). Such a supplemental brake arrangement requires a large installation space in axial direction of the cone wheel. Furthermore, because of the relatively small transmission ratio of the torque entering the cone wheel relative to the vehicle wheels, relatively large brake operating forces are required.
It is the object of the present invention to provide a simple braking arrangement of the above type, which provides large braking effects with small operating forces.
SUMMARY OF THE INVENTION
In an arrangement for transferring brake torques of a vehicle drive line including a differential transmission having a housing, a driving pinion and two wheel shafts supported in the housing and a brake structure arranged adjacent the housing, a brake member is provided for rotation with the driving pinion and a braking member is supported by the housing of the differential transmission for engaging the brake member when the brake structure is actuated.
In this arrangement, the brake torque is transferred to the driving pinion of the differential transmission so that the braking torque of the brake member associated with the pinion is transmitted at the transmission ratio of the differential transmission. As a result, high braking effects can be achieved with relatively low brake operating forces. The brake member, that is a brake drum or a brake disc, is for example, mounted on the pinion in form-locking or frictional engagement therewith, whereby a compact rigid and simple brake device is formed.
The driving pinion in this case is mounted on a shaft so as to be rotatable therewith, for example, by an elastic or rigid coupling or by way of a flange. The brake member is rotatable with the shaft, particularly in a friction- or form-locking manner. The brake member is supported by the axle housing propped up by a structure outside, for example, at a distance from, the differential transmission. The support arrangement outside the differential transmission by a support structure provides for a particularly effective embodiment, which is rigidly supported but can be easily installed and removed. With the large leverage obtained by such a prop-up arrangement, large torques can be generated and transferred without affecting the mounting structure for the differential transmission or the axle.
In a particular embodiment of the invention, the brake arrangement is in the form of a drum brake, particularly a dual power drum brake. In this way, conventional brake structures which are manufactured in large numbers can be utilized. They have also all the well-known advantages of dual power drum brakes such as low operating forces.
In another embodiment of the invention, the braking arrangement includes an axially movable operating mechanism.
This provides for a simple arrangement for an operating cable and the guide structure therefore. Also, the cable is relatively short and can be supported and guided with low friction. With an axial operating mechanism, it is further possible to use known brake arrangements, which have a symmetrical braking effect that is they generate the same braking force in either direction of rotation of the drive pinion.
Preferably, the brake arrangement is provided in addition to the wheel brakes of a vehicle to be used as a parking brake. In this way, redundancy is provided whereby the safety is increased. Also, the arrangement, acting in cooperation with the wheel brakes, can increase the brake holding torque.
The prop-up arrangement preferably includes an arm, which extends from the brake body and is connected to a strut mounted, for example, to the differential transmission housing or the axle by way of a pivot connection. In this way, the arm and the strut can be arranged in different planes. Relative movements between the components involved can be accommodated so that movements of the brake arrangement relative to the housing or the axle are possible. The arrangement also permits a selection of the installation spaces for additional components such as the location of the brake cable.
Advantageous embodiments of the invention will be described below on the basis of the accompanying drawings.
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Herffurth Rainer
Mierisch Uwe
Mosler Christian
Spielmann Werner
Bach Klaus J.
Daimler-Chrysler AG
Nguyen Xuan Lan
Oberleitner Robert J.
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