Machine element or mechanism – Mechanical movements – Reciprocating to or from oscillating
Patent
1996-11-27
1999-05-04
Marmor, Charles A.
Machine element or mechanism
Mechanical movements
Reciprocating to or from oscillating
74 20, 74 89, 74102, 92 31, 92 33, F16H 2150, F16H 2152, F16H 2154
Patent
active
058991123
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for converting linear motion to rotary motion and vice versa. The invention is applicable to a wide variety of uses and may for example be operated by fluids arranged to act on or transmit fluids. Examples of such uses include engines, motors, pumps, generators, compressors and the like. The fluid may be of a compressible or expandable nature such as for example a gas or gas mixture or may be in the form of an incompressible fluid where it may be used in hydraulic applications.
In U.S. Pat. No. 4,796,514 there is described a device for converting rotary motion into linear motion and vice versa wherein a unique coupling mechanism was provided for the motion conversion. In the device described in the aforementioned US patent there is provided a piston arranged for linear movement within a cylinder and a rotatable disc with a connecting mechanism operatively connecting the piston to the disc so that respective linear or rotational movement of one member causes the respective linear or rotational movement of the other member. The connecting mechanism comprises a sleeve which is operatively connected to the piston for reciprocating movement therewith. The sleeve is arranged for sliding movement on a shaft operatively connected to the disc. Both the sleeve and shaft are offset from the central axis of the piston and disc. A control link is operatively connected to the sleeve so as to cause orbital movement of the shaft about the central axis in response to movement of one of either the piston or the disc.
Whilst the device described in this patent specification has been found to operate satisfactorily it contains a relatively large number of moving parts and as such is relatively complicated in construction. One problem of the device described in the aforementioned patent is that the part connected to the piston is axially offset from the central axis. This can cause forces to be applied to the parts resulting in undesirable friction between the moving parts.
An object of the present invention is to provide an improved rotary/linear converter which is relatively simple in construction.
According to one aspect of the present invention there is provided a rotary/linear converter comprising a reciprocator having a main axis and being adapted for reciprocating movement in the direction of the main axis and a rotator adapted for rotating movement about the main axis, the converter further including converter means which operatively interconnects the reciprocator and the rotator and comprising a reciprocating section operatively connected to the reciprocator and substantially co-axial with the main axis thereof, a rotating section operatively connected to the rotator and a control section, a control link having one end portion thereof pivotally connected to said control section with its pivot axis offset with respect to said main axis and the other end portion pivotally connected to a mounting, said link adapted to pivotally oscillate about said mounting in response to movement of one of either said rotator or said reciprocator thereby causing movement of the other of said rotator or said reciprocator. As used within this specification the term pivot connection includes within its scope generally universal movement at the connection point between the two parts.
Preferably the reciprocating section of the converter means has a longitudinal axis which is co-axial with the main axis of the reciprocator. The rotating section of the converter means has a longitudinal axis which may in one form be co-axial with the main axis of the reciprocator or in another form be offset from that main axis.
The reciprocator may be in the form of a piston disposed within a cylinder for reciprocating movement relative thereto. The piston/cylinder assembly may be provided for use in an internal or external combustion engine or used for hydraulic fluids and the like. It may further find application in gearing arrangements or other equipment and industrial apparatus. It is not necessary that the reciprocato
REFERENCES:
patent: 4133215 (1979-01-01), Norris et al.
patent: 4796514 (1989-01-01), Richter
Marmor Charles A.
Parekh Ankur
Richter Technology Limited
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