Machine element or mechanism – Elements – Cams
Patent
1987-07-17
1989-06-13
Aschenbrenner, Peter A.
Machine element or mechanism
Elements
Cams
74567, 74569, F16H 5300
Patent
active
048381144
DESCRIPTION:
BRIEF SUMMARY
This invention relates to arrangements for converting rotary motion to linear motion, which arrangements find application inter alia, but not exclusively, in the instigational timing and motive forces necessary for the eventual linear operational movements of Poppet Valves. Such valves are commonly used in the intake and exhaust systems of internal combustion engines.
The invention can also be used to provide a variable instigation, from rotary to linear motion, or movement, for any type of lever or pulsed action device; for example; metering systems; pumps (particularly those of the Peristaltic type, wherein flow-rate, as against pressure, can be varied); hammer-action drills and devices etc.; pressure loading devices are used to fill, or form, containers (e.g.; the material content of say, a Tooth-paste tube, or the plastic injection device as used in the manufacturing process of the tube itself, etc;); reciprocation couplings of all kinds, especially internal combustion engines; timing devices etc.
The description, herein contained, is concerned with the uses involved with the gas flow to, and form, an internal combustion engine cylinder, however, the basic principles hold good for any other application, and the simplicity of the device can be well illustrated within this context.
Internal Combustion Engines, used as they are, in a variety of ways; e.g. Cars; Lorries; Trains; Aeroplanes; Boats; Motor Cycles; Generators; Pumping Units; etc. etc., are all able to benefit from an ability to vary the valve timing, especially if this can be accomplished while the engine is running and at any engine revolutionary speed.
The control system for this invention, can be of any suitable type, however, it would seem logical to include a micro-processor in order that maximum effect, at all times, can be realised.
In order that the invention may be readily understood, embodiments thereof will now be described, by way of example, with reference to the accompanying drawings, in which:
FIGS. 1 to 3 illustrate a first arrangement embodying the present invention;
FIG. 4 illustrates a modification of the arrangement of FIGS. 1 to 3;
FIG. 5 illustrates another modification of the arrangement of FIGS. 1 to 3;
FIGS. 6 and 7 illustrate a further modification of the arrangement of FIGS. 1 to 3;
FIGS. 8 and 9 show a second arrangement embodying the present invention; and
FIGS. 10 to 15 illustrate the application of arrangements embodying the invention to poppet valves.
It will be seen that th Roller (3) is a free-running component, and is situated at the radial tip of the Follower (4) and is in contact with the Internal, Concentric Annular Surface (2). This Roller (3) may be of any suitable type, and in some embodiments, may be dispensed with altogether with the tip of the Follower (4), being in direct, or indirect (i.e., via some other suitable bearing device or item) with the Internal, Concentric Annular Surface (2).
It is assumed, in this particular embodiment, that Main-Shaft (1) is able to rotate in either direction and that it's centre datum remains constant.
The concentric centre of the Internal Concentric Surface (4) being the same as the Main-Shaft Centre Datum.
Throughout this description, all `solid` black areas are representative of bearing surfaces and/or devices etc.
Therefore, it will be seen, that the internal Guide-Walls (4a and 4b) of the free moving Follower (4) are in bearing contact with the parallel side surfaces of the Main-Shaft (1).
The cross-section of the Main-Shaft is indicated as being basically square in profile, however, this section can be of any suitable cross-section capable of providing a rotary drive bond between the Shaft (1) and the Follower (4) i.e.; this can, if required, be a multi-shaft component etc.
FIG. 2 indicates that Follower (4) is restricted in any lateral movement along the Main-Shaft (1) by the Spacers (9 and 9a). FIG. 2 is a cutaway side elevation of the device depicted in both FIGS. 1 and 3. FIG. 3 being a `top` or plan view of said device.
Follower (4) is, therefore, able to
REFERENCES:
patent: 1785736 (1930-12-01), Hess
patent: 1980527 (1934-11-01), Hewton
patent: 2072990 (1937-03-01), Phillips
patent: 3045503 (1962-07-01), Kiessling
patent: 3800621 (1974-04-01), Hoglund
patent: 3977263 (1976-08-01), Nara
patent: 4193321 (1980-03-01), King
patent: 4687425 (1987-08-01), Takano et al.
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