Expansible chamber devices – Rectilinearly moving working member and coaxial or parallel... – Element extends through working member portion
Patent
1987-06-29
1989-01-10
Garrett, Robert E.
Expansible chamber devices
Rectilinearly moving working member and coaxial or parallel...
Element extends through working member portion
92 65, 92 69A, 92 69B, 92 70, 92 75, 92 76, 92150, 74102, F01B 300, F01B 710, F01B 702
Patent
active
047965142
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for converting linear motion to rotary motion and vice-versa. For example, the principles of this invention may be applied to a fluid operated engine or motor and particularly to such a device which is capable of producing rotary motion of a shaft to power motor vehicles, farm machinery, and stationary devices such as pumps, heat exchangers, generators and so on.
In particular, the engine or motor of this preferred application is capable of being operated by a wide range of fluids and in fact may be operated with any type of expandable fluid, whether or not prior ignition is required. Thus, the device may be operated with a compressed or pressurised fluid such as air, steam or helium which is allowed to expand, or alternatively the motor may be operated with fluids such as petrol, gas or other hydrocarbon or similar fuel which require ignition to cause the necessary expansion. Conversely, when operated as a pump, the device of this invention may be used to pump or compress both liquid and gaseous fluids.
In Australian Patent Specification No. 501555, there is described a fluid operated device comprising: a cylinder member, at least two mutually opposed piston members movable axially therein, a working chamber within said cylinder member defined by opposing ends of said piston members and the inner wall of said cylinder member, said cylinder member being provided with inlet and outlet means communicating with said working chamber for admission of working fluid to said chamber and for removal of spent working fluid from said chamber, respectively; a shaft member extending through said piston members and said cylinder member concentrically with said members; first coupling means coupling the piston members to one of the other mentioned members such that axial reciprocation of the piston member causes rotation of the piston members relative to said one of the other mentioned members, second coupling means coupling the piston members to the other mentioned members to prevent relative rotation of the piston members and said other one of the other mentioned members while permitting axial reciprocation of the piston members; and valve means in said working chamber operatively coupled to said shaft member for rotation with said shaft member relative to the cylinder member to control movement of working fluid into and out of said working chamber through said inlet and outlet means. In particular embodiments disclosed therein, the first coupling means comprises at least one continuous sinusoidal guidway formed in a surface of either the piston member or the cylinder member, and at least one associated cam follower mounted in a facing surface of the cylinder member or the piston member, respectively, to project therefrom and engage the guideway; and the second coupling means of these embodiments comprises at least one axially extending guideway formed in a surface of the piston member or the shaft member, and at least one associated cam follower mounted in a facing surface of the shaft member or the piston member, respectively, to project therefrom and engage the guideway. In alternative embodiments, the arrangement of the first and second coupling means is reversed in that the first coupling means comprises at least one continuous sinusoidal guideway formed in a surface of the piston member or the shaft member, and at least one associated cam follower mounted in a facing surface of the shaft member or the piston member, respectively, to project therefrom and engage the guideway; and the second coupling means comprises at least one axially extending guideway formed in a surface of the piston member or the cylinder member, and at least one associated cam follower mounted in a facing surface of the cylinder member or the piston member, respectively, to project therefrom and engage said guideway.
It is an object of the present invention to provide an improved rotary/linear convertor which is relatively simple in construction and more efficient. According to the present invention there i
REFERENCES:
patent: 1613116 (1927-01-01), Michell
patent: 3130592 (1964-04-01), Burrison
patent: 4090478 (1978-05-01), Trimble et al.
patent: 4180028 (1979-12-01), Richter
Garrett Robert E.
Williamson Mark A.
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