192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1989-09-08
1991-07-09
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
475 28, B60K 4126
Patent
active
050296825
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a brake system for full-track vehicles.
DE-C 21 14 951 disclosed such a brake system for a tracked vehicle including a superimposed steering gear consisting of one hydrodynamic brake, hereinafter in the specification designated as retarder, and two friction brakes, wherein the hydrodynamic brake/retarder is situated in the power path before the superimposed steering gear and the friction brakes behind the superimposed steering gear.
The periodical "Soldat und Technik", Apr. 4, 1967, pages 187-188, disclosed a brake system for a tracked vehicle having a superimposed steering gear and a foot and hand brake, wherein the so-called partial disc brake is situated between the transmission and the lateral countershaft and the foot brake is hydraulically operated with motor oil and the hand brake, which is at the same time parking brake, is mechanically operated.
Finally, DE-OS 35 38 002 disclosed a modern transmission system for full-track vehicles having assemblies that had been previously made and tested where, for instance, the retarder combined with the gear shift and both summing transmissions with the respective lateral covers are designed as assemblies. The friction brakes, not shown in this publication, are, as disclosed above, situated between the lateral countershaft upon which the caterpillar tracks are mounted and the transmission housing, that is, outside the lateral cover of the assembly with summing transmission.
All said designs have proved satisfactory, but require a high cost of construction based on the whole brake system and all designs impair the steering behavior when fully braking and when parking in the range of low speeds.
Starting with DE-DC 21 14 951, the problem to be solved by the invention is to improve and design, in relation construction cost, a brake system in a manner such that the actuation of the brake causes absolutely no impairment in the steering.
By supporting the friction brakes before the respective summing transmissions, it is possible to remove the steering impairment. The improvement is very effective specially in the range of low travelling speeds, since in this range the share of the friction brake in the total brake torque is very high. If there are provided two friction brakes directly connected with the driving wheel of the corresponding summing transmission, the dimensions can be such that the friction brake be situated in the lateral cover of the assembly with summing transmission. The difficulty in accessibility to the friction brake which results in such a system within the transmission housing is thus removed again. The lateral cover of the assembly with summing transmission and friction brake is very easily removable from the whole transmission housing and the access to the brake is thereby easily possible. If the brake discs of the friction brake also used for the parking brake and if the latter is also accommodated in the lateral cover of the assembly, a specially advantageous arrangement results and also a good accessibility for the parking brake. Except for the oil passage no construction expense is needed outside the transmission system for the necessary parking brake. If in addition to the secondary retarder known in such transmission systems there is also disposed a primary retarder, it is possible to brake down to almost modulation rate over a substantially broader speed range. At a speed below 6 km/h, for instance, the shift brakes present in a gear can then be also used as friction brakes. Primary and secondary retarders are specially favorably situated in the gear shift of the assembly.
The invention is not limited to the combination of features of the claims. Other logically possible combinations result for the expert from the claims and individual features of the claims in accordance with the stated problem.
Other details of the invention are explained with reference to drawings and embodiments. In the drawings:
FIG. 1 shows diagrammatically a transmission system with a secondary retarder and two friction brakes respective
REFERENCES:
patent: 3044320 (1962-07-01), Oudry
patent: 3425296 (1969-02-01), Livezey
patent: 3601211 (1971-08-01), Finke
patent: 4235320 (1980-11-01), Polak et al.
patent: 4377094 (1983-03-01), Thompson et al.
patent: 4480728 (1984-11-01), Bailey et al.
patent: 4497219 (1985-02-01), Elsner
patent: 4796486 (1989-01-01), Binger et al.
Binger Bernhard
Kontny Horst
Maurer Norbert
Bonck Rodney H.
Zahnradfabrik Friedrichshafen AG
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