Brakes – Operators – Spring
Patent
1989-03-16
1990-08-14
Reger, Duane A.
Brakes
Operators
Spring
188 723, 192 13A, F16D 6524
Patent
active
049479660
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a vehicle gearbox incorporating a brake. Such vehicle gearboxes have been disclosed, for instance, in DE-C-30 13 431. Therefrom a brake incorporated in the gearbox housing of a wheel head, having oil-wetted braking discs, has become known and in which a braking piston guided inside a ring gear support for the planetary gear enclosed by the housing allows a fluid-actuatable activation of a service brake by compressing the braking discs thereof For housing reasons, it did not seem possible to use said braking device as a parking brake on account of the predetermined dimensions of the housing. Thus, in order not to lengthen the housing, in those vehicles, it was necessary to provide separately arranged parking brakes outside the housing, such as on added axles, in addition to the service brake inside the housing. This resulted not only in additional construction costs and use of space but also in dangers of contamination and damage due to accumulation of slime, ground contacts, etc.
The problem now to be solved by the invention is to house, in the same gearbox housings where hitherto only one service brake was housed in the ring gear support of a planetary gear, an additional parking brake acting on the same braking discs without enlargement of the housing or complicated the manipulation, in a manner such that the installation of the parking brake can also be optionally offered without a fundamental change of construction.
The solution is obtained by the fact that a parking brake acting on the same braking discs also present is housed in an axial free space between a ring gear support and a brake, in addition to the service brake, within unchanged permanent dimensions of the housing and nearly radially covered by the service brake. In case of failure of the source of pressure fluid, a compression spring system pressing against the braking pressure plate and is capable of overcoming with certainty the force of the return springs that keep the brake disengaged during travel is, for this purpose, supported not only against the brake pressure plate but also, with a special saving of space, against a brake-lifting piston which upon activation of a brake-lifting cylinder provided on the hub of the ring gear support is capable, via its own fluid line, of again loosening and constantly keeping disengaged the parking brake until the brake-lifting line again relaxes. Here the arrangement of the brake-lifting cylinder and of the compression-spring system is such that both the braking piston and the ring gear support, in the design provided for the use of the parking brake, can optionally be used and limit the adaptation steps to a few bores and overwindings.
When a ring, externally enveloped by an annular brake-lifting piston and intermediate between the face end on the brake side of the hub collar of the ring gear support and a fastening bolt that simultaneously axially locks the ring gear support on the axle line, is suspended and non-rotatably retained on an inner surface of the hub collar designed as peripheral sealing surface, a configuration of the annular brake-lifting cylinder results that is especially favorable in manufacture and also space saving.
When as a result of the use of a wheel-shaped braking disc support, the inner braking discs receive a relatively larger inner diameter, another space-saving possibility for housing the compression spring set is offered radially beneath the annular braking piston, and the web of the braking disc support can be axially removed or offset according to the axial outlines of the annular brake-lifting cylinder.
By means of an outer rim of the braking disc support shaped to form a permanent oil ring beneath the braking discs upon rotation of the braking disc support and the radial oil-passage bores provided therein, which are uniformly distributed on the periphery, an intensive cooling of the braking discs is ensured despite reduced space conditions.
With an outer rim of the braking disc support projecting on the planetary side and axial bores in the
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Reger Duane A.
Zahnradfabrik Friedrichshafen AG
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