Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1983-08-11
1986-09-30
Husar, Stephen F.
Machine element or mechanism
Gearing
Directly cooperating gears
744248R, 74 8915, F16H 110
Patent
active
046141286
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a linear-drive device with two motors, in the case of which one motor drives a nut and the other motor drives a threaded rod. Such a device has the advantage of a much larger regulation range for thrust velocity compared with a device which works only with one motor, which for example drives the spindle.
A crawling, very slow thrust can be achieved if both motors have the same rotational direction, but are operated with a slight revolution speed difference.
A rapid thrust can be achieved if only one motor is operated and the other motor stands still and finally, a very rapid thrust can be achieved if the motors are operated contrarotating.
STATE OF THE ART
U.S. Pat. No. 2,630,022 (Terdina) shows a linear drive device with two motors in open design. The motor axes run vertical to the spindle axle and drive the spindle or the nut each over their own worm gear. Due to this, the design effort is relatively great and no clean compact design of the device can be achieved. The use of the drive in aircraft is proposed in the invention, whereby it is pointed out as special advantage that the drive still remains operational if one of the two motors fails. Of course this applies for all such linear drive devices, if these are operated with two motors.
U.S. Pat. No. 2,481,477 (Peery) shows a double-motored linear drive mechanism, in the case of which one motor directly drives the spindle. The motor, which drive the nut, lies beside the spindle and drives the nut over a drive gear.
OBJECT OF THE INVENTION
It is the object of the invention to procure a linear drive device with two motors, which exhibits an esthetic, mechanically clear, simple design and one which is inexpensive to manufacture. The mechanical parts should be located in a closed housing and they should be protected from getting dirty. In order that each thrust movement can take place free of clearance and without delay, intermediate gears such as gear wheels or worm gears are to be avoided if possible.
The device should exhibit as small friction losses as possible and should be able to exert full thrust force or propelling force immediately from a standstill.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of a two electromotor assembly.
FIG. 2 is a partial cut-away view of FIG. 1.
FIG. 3 is a side view of a single motor unit.
FIG. 4 is a partial cut-away view of FIG. 3.
FIG. 5 is a side view with a partial cut-away section of a unit having a motor at each end thereof.
FIG. 6 is a side view of the ball rotating nut assembly.
FIG. 7 is a cross-sectional view along line 7--7 of FIG. 5.
FIG. 8 is a sectional view of the telescoping assembly of a modification of FIG. 5 employing a wedge.
FIG. 9 is a cross-sectional view of a telescoping tube assembly in which ball elements are used.
FIG. 10 is a cross-sectional view of another modification showing in cross-section the telescoping tubes inward lengthwise grooves are employed .
THE INVENTION
The invention solves the set object with a linear thrust device. Different design forms are possible. The nut can be mounted non-rotating, but axially shiftable in the drive tube. It then drives a connecting rod extending out of the housing. But the nut can also be arranged firmly on the end of the drive tube and then drives two housing parts which can be moved telescopically into each other.
In the following, some design examples will be described concerning the object of the invention on the basis of the drawing:
DESCRIPTION OF THE INVENTION
The linear thrust device shown in FIG. 1 has two electromotors 10 and 50 which are designed on housing part 20, in which a gear unit 20 is housed. Another housing part 30 is connected to housing 20, in which there is the actual thrust device with nut and threaded rod. The connecting rod 40 extends out of housing 30, and this connecting rod 40 is provided with a rotatable head 41. Head 41 and housing 30 are both provided with pivots 42 and 31 in order to be able to mount the linear thrust device in a rotatable manner
REFERENCES:
patent: 2481477 (1949-09-01), Peery
patent: 2630022 (1953-03-01), Terdina
patent: 2860266 (1958-11-01), Schrader
patent: 3407680 (1968-10-01), Westmoreland
Husar Stephen F.
Lars International S.A., Luxembourg
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