Machine element or mechanism – Alternate manual or power operators
Patent
1987-01-28
1988-01-19
Herrmann, Allan D.
Machine element or mechanism
Alternate manual or power operators
74 1054, 74 8915, 74640, 74665D, 74805, F16H 3518, F16H 122
Patent
active
047198168
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for positioning of an actuator comprising a rotational part which is in engagement with the actuator for linear displacement of the latter when rotating the rotational part.
BACKGROUND OF THE INVENTION
Known such devices include either tapezoidal screw systems or ballscrew systems driven either fully manually or manually in combination with a motor as in several machine tools. In the last mentioned case the manual rotational motion is supplied by a separate shaft or spindle while th motor is set in engagement by an other spindle.
OBJECTS AND SUMMARY OF THE INVENTION
An object of this invention is to bring about a device in which the same spindle as is used for manual actuation can be used also for motorized actuation. From a functional point of view the manual motion should be considered as a fine or precision motion.
BRIEF DESCRIPTION OF DRAWING
The invention will be more particulary described in connection with the attached drawing, in which:
FIG. 1 is a partially cut away view of an embodiment of a positioning device according to the invention;
FIG. 2 is a schematic view showing the principle upon which the motor of the invention operates;
FIG. 3 is a schematic view showing the principle of FIG. 2;
FIG. 4 is an isolated view of the encircled portion of FIG. 3; and
FIG. 5 is a schematic view showing the principle upon which the motor of the invention operates wherein the elastic stator of the motor is in a rest position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 1 shows an embodiment of the device according to the invention for positioning of an actuator which consists of a piston 1 with circular cross section. The piston 1 is intended to be connected at its free end to a not shown load for controlled linear displacement of this load. The other end of the piston 1 is sleeve-shaped and provided with an internal trapezoidal thread 2 in mesh with a tapezoidal thread of a rotational stationary spindle 3. The actuator piston 1 is supported by a guide bearing 4 in a housing 5 which also contains an element 6 not shown in detail, e.g. a spline set, to prevent the piston 1 from rotating when the spindle 3 is rotated. The spindle 3 is in turn rotationally supported by a bearing 7 in the housing 5.
According to the invention the spindle 3 constitutes the output spindle of a motor known per se, which in the embodiment shown is a fluid pressure controlled rotary stepping motor in accordance with Swedish Pat. No. 7109362-9. The stepping motor 8 is arranged in the housing 5 and consists of a rotor in the form of a rigid circular ring gear 9 with internal teeth 13, FIG. 4, a stator in the form of an elastic strain gear 10 oriented co-axially to the rotor with external teeth 14, FIG. 4. The two gears 9 and 10 have different numbers of teeth and are arranged to have the teeth fully meshed at diametrically located portions of the gears. An even number of force supplying elements 16 are uniformly distributed around the periphery of the elastic strain gear 10 to bring this gear into mesh with the rigid ring gear 9 to rotate the latter in a manner known per se. The fluid pressure is supplied to the motor 8 via an air or hydralic hose 11 from a pressure source not shown.
The rigid ring gear 9 is firmly connected to the spindle 3 which extends freely through the elastic strain gear and at its other end carries a wheel 12 by which the spindle 3 can be rotated when the elastic gear 10 is out of mesh with the rigid ring gear 9. When the wheel 12 is rotated, the rigid gear 9, i.e. the rotor of the motor, will of course also rotate. By means of the wheel 12 the spindle 3 can thus be rotated quickly by hand for coarse positioning of the position of the piston 1. For precision positioning or fine control of the position of the piston 1 the motor 8 will however be driven by fluid pressure from the pressure source not shown.
The principle upon which the preferred motor operates is disclosed in the Swedish Patent mentioned above, and is shown in FI
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Herrmann Allan D.
Rotell AB
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