Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1997-07-28
1999-02-02
Bonck, Rodney H.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74570, 1231974, F16H 2136
Patent
active
058650601
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a mechanism for interconnecting a rotary component and at least one linearly reciprocable member.
There has been a great number of proposals for mechanisms arranged to interconnect a rotary component and at least one linearly reciprocable member, whereby rotation of the component causes the member to reciprocate, or reciprocation of the member causes the component to rotate. The simplest of such mechanisms comprises a rotatable crank linked by a connecting rod to the reciprocable member which, in the case of a reciprocating piston engine or pump, comprises a piston sliding within a cylinder. The connecting rod is journalled one end to the crank and at its other end to the piston, or to a piston rod in turn connected to the piston. Such an arrangement is very widely employed, but has the disadvantage that the piston movement is a complex function of connecting rod length; the piston movement is only truly sinusoidal with a connecting rod of infinite length.
An alternative interconnecting mechanism comprises an eccentric device. Here, a disc (the "eccentric") is mounted eccentrically on a shaft and an eccentric strap fits slidingly therearound, the eccentric strap being linked to the reciprocable member by a connecting rod rigidly secured at one end to that strap. Movement of the member again is only truly sinusoidal with an infinitely long connecting rod.
True sinusoidal member reciprocation may be achieved with a mechanism including rotatable component having a pin which follows a circular locus and running in a slot provided in the reciprocable member, with the slot extending at right angles to both the direction of reciprocation and axis of rotation. It is however difficult to manufacture such a mechanism without introducing relatively large clearances and so significant backlash. Though there are innumerable other mechanisms for linking a rotatable component and a reciprocable member, mention here may be made of the Maltese Cross mechanism, wherein up to four reciprocable members, arranged in a cross-like formation, are caused to reciprocate by means of a respective pin on each member engaging in a curved cam surface formed on the rotatable component. Such a mechanism does not smoothly and continuously drive the reciprocable members and can be operated only relatively slowly.
The present invention aims at providing an interconnecting mechanism for at least one linearly reciprocable member, but possibly up to four such members, which mechanism may be smoothly-operating and have a predictable function for the linear movement of the or each reciprocable member relative to component rotation.
According to the present invention, there is provided a mechanism for interconnecting a rotary component and at least one linearly reciprocable member, which mechanism comprises; external eccentric surface off-centre with respect to the axis of the bore, the toothed surface of the first rotary component being rotatably received within said bore with the respective teeth meshed; the external eccentric surface; and path normal to the axis of the first rotary component.
The mechanism of this invention may be regarded as a kind of double-eccentric mechanism, the first eccentric being defined by the first rotary component and the second rotary component which orbits therearound. The second rotary component has at least one but preferably pair of second eccentrics mounted thereon, which are directly coupled to at least one but preferably a pair of reciprocable members, whereby rotation of the first rotary component in one sense causes rotation of the second rotary component therearound, in the same sense, and the action of both rotary components causes linear sliding movement of the or each reciprocable member. Conversely, reciprocation of the or each reciprocable member will cause rotation of both the second and first rotary components, whereby a rotary output is obtained from the first rotary component of mechanism.
The eccentricity of the second rotary component with respect to the first rotary c
REFERENCES:
patent: 2506110 (1950-05-01), Rzepela
patent: 4173151 (1979-11-01), Grundy
patent: 4850313 (1989-07-01), Gibbons
patent: 5158046 (1992-10-01), Rucker
patent: 5503038 (1996-04-01), Aquino et al.
Bonck Rodney H.
Joyce William C.
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