Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1989-08-18
1990-03-06
Hill, Mitchell J.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
91375A, 13762521, 180149, B62D 508, F16F 114
Patent
active
049057820
DESCRIPTION:
BRIEF SUMMARY
The invention is concerned with a steering valve for vehicles with torque input member for connecting to a steering column, and an output member for connection to a steering linkage through a torsion rod and being rotative between motion limit stops. The torsion rod has an average torsion area with a reduced cross section and connects at its ends.
BACKGROUND OF THE INVENTION
A steering control valve of the type described is shown in DE-PS 27 39 405, the U.S. counterpart being Tobias U.S. Pat. No. 4,387,737.
The operation is conventional in that friction of the vehicle front, or steered wheels on the ground result in torsional twist of the torque rod which causes relative rotation between valve elements to permit pressure flow to one side of a double acting servomotor, while exhausting the other side, dependent on direction of steering, to actuate a steering mechanism.
Another arrangement for operation is shown in Elser U.S. Pat. No. 4,198,898 (DE PS 27 39 405).
The torsion section of the torsion rod primarily determines the overall length of the steering valve. However, since the respective ends of the torsion rod must connect with the torsion area, the overall length necessarily becomes larger. A specific length is necessary in order to take into account the input shaft or member and the output shaft.
BRIEF DESCRIPTION OF THE INVENTION
It is an object of the present invention to provide a steering valve with a torsion rod of the kind described hereinabove, as in the U.S. Pat. No. 4,387,737 to Tobias, but which provides for a shorter valve construct8on.
The object is achieved by having a torque rod of reduced cross section between end portions, which is not novel, per se, but wherein each end portion has a connecting member for connection to an input member at one end of the torque rod and to an output shaft at the other end of the torque member.
In particular, one of the connecting members is radially spaced from the torque rod to effect a bearing for the rotor of the rotary valve.
Another object of the invention is to take advantage of the spacing by having a throttle bore through the bearing which receives flow from a return passage in the valve rotor. The throttle bore reduces return pressure and quiets the operation of the valve. By such an arrangement, the construction herein differs from the Tobias patent and has an advantage thereover by way of valve size reduction, all as will be made clear from the detailed description subsequently to follow.
Thus, by using end portions which are very short and serve only for connection of the torsion rod to the connecting members, such connecting members take over the function of hitherto existing shafts. Economy in production is effected, since end portions and connecting members can be made from cheaper materials than the torsion rod itself, and which are easily machined and shaped. Additionally, torsion rods with a small initial diameter can be used.
A detailed description of the invention now follows, in conjunction with the appended drawing, which shows a longitudinal section through a rotary steering valve comprising an outer sleeve with an inner rotor, having suitable coacting grooves for flow control of a servomotor upon relative rotation of the two valve components.
The details of the invention are illustrated in the aforementioned connecting ends, particularly the connecting end at the output shaft, which is extended inwardly over a portion of the torsion area of the torsion rod spacedly.
In general, rotary steering valves of the kind shown are basically known, comprising inner and outer relatively rotative components, and their operation is ell known.
Referring now to the drawing, a rotary valve 1 is shown, comprising the outer sleeve 2 which encompasses a rotor R and an output shaft 3, or other member to actuate steering such as can be supplied with pinion (not shown) for operating a steering rack (not shown),. The pump 4 provides pressure oil to the valve housing 6 encompassing the above components with an annular channel 16. Channel 16 distri
REFERENCES:
patent: 4198898 (1980-04-01), Elser
patent: 4294325 (1981-10-01), Nomura
patent: 4387737 (1983-06-01), Tobiasz
patent: 4678052 (1987-07-01), Suzuki et al.
patent: 4715464 (1987-12-01), Nakamura et al.
patent: 4796715 (1989-01-01), Futaba et al.
Breitweg Werner
Rieger Wolfgang
Hill Mitchell J.
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
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