Machine element or mechanism – Mechanical movements – Oscillation or reciprocation to intermittent unidirectional...
Patent
1994-08-26
1996-11-26
Marmor, Charles A.
Machine element or mechanism
Mechanical movements
Oscillation or reciprocation to intermittent unidirectional...
74143, 280244, F16H 2508
Patent
active
055774121
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the art of transmitting rotation to objects, and more particularly to an apparatus for converting a reciprocating motion into unidirectional rotation.
BACKGROUND OF THE INVENTION
There is known a device for converting a reciprocating motion into unidirectional rotation (PCT/SU90/00280) in the form of a non-self-braking helical mechanism housed in a casing. The helical mechanism has a driving member in the form of a screw with a unit for applying an axial force, and a driven member in the form of a nut journaled in bearings inside the casing and connected to the driving member through rolling bodies. The driven and driving members make up a helical rolling transmission. Connected to the unit for applying an axial force is a mechanism for generating and varying this force fashioned either as a controllable power cylinder, or as a hinged-lever system capable of smoothly varying the ratio between the lever arms.
However, the known hinged-lever mechanisms for generating and varying an axial force produce radial component forces that negatively affect the efficiency of the axial force application unit in operation by causing its deformation and skewing. Also, the power elements of such systems, for example, the casing taking up the forces of reaction from forces exerted on the driven member must have substantial dimensions and weight to provide the required rigidity.
SUMMARY OF THE INVENTION
This invention is directed toward the provision of an apparatus for converting a reciprocating motion into unidirectional rotation in which by virtue of varying the engagement of a mechanism for generating an axial force, unit for applying an axial force, driving and driven members it would be possible to ensure the movement, smooth braking, reversing, free inertia rotation in one direction through preventing rotation in the opposite direction, and free rotation in any direction.
The object of the invention has been attained by that in an apparatus for converting a reciprocating motion into unidirectional rotation in the form of a non-self-braking helical mechanism housed in a casing and having a driving member with a unit for applying an axial force connected to this driving member and to a mechanism for generating an axial force and provided with a mechanism for varying this force, the driving member being connected to the unit for applying an axial force for free axial displacement, free rotation, locking, and engagement by its two surfaces, of which one is a locking surface and the other is a sliding surface, with corresponding identical surfaces of the unit for applying an axial force, and also having a driven member connected to the driving member through rolling bodies and capable of rotating about its own axis, according to the invention, the mechanism for generating an axial force has the form of a helical transmission providing a torque to change the turning angle of the driven member, the driving member of the helical transmission being positioned coaxially with the driven member and rigidly connected to the unit for applying an axial force for engagement with the driving and driven members.
Provision of the mechanism for generating an axial force in the form of a helical transmission allows to prevent the appearance of parasitic components of the axial force causing deformation and skewing of the unit for applying the axial force and reducing the general efficiency of the apparatus. The driving force acts in a plane parallel with the plane of rotation of the driving member. Forces of reaction resulting from the forces applied to the driven member are closed up inside the apparatus, therefore allowing to substantially reduce the mass and linear dimensions of the power members taking up these forces, such as the casing. In addition, the driving and motion-converting helical transmissions can be arranged coaxially to still further reduce the size of the mechanism.
The unit for applying an axial force engages both with the driving and driven members of the helic
REFERENCES:
patent: 4762332 (1988-08-01), Seol
patent: 4829841 (1989-05-01), Ogawa
patent: 4865344 (1989-09-01), Romero, Sr. et al.
patent: 5362081 (1994-11-01), Beidler et al.
Grabow Troy
Marmor Charles A.
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