US2512211A - Velocity governor compensating device - Google Patents

Description

June 1950 H. c. MINNIEAR 1 VELOCITY GOVERNOR COMPENSATING DEVICE Filed March 10; 1944 Patented June 20, 1950 VELOCITY GOVERNOR COMPENSATIN G DEVICE Herbert G. liiinniear, Anderson, Ind, assignor ,to Pierce Governor Company, Anderson, Ind., a

corporation Application March 10, 19514, Serial No. 525,965

2 Claims.

This invention relates to a velocity governor and more particularly to compensating means for compensating for the variable forces imposed by the fuel mixture upon the control valve and its shaft.

Heretofore such compensating devices, if of mechanical type, usually have included wearable parts, cams and the like so that after some use, the compensation provided by the mechanism varies from the initial predetermined compensation and the greater the use, the greater will be this departure.

Also, heretofore compensation mechanism has been of difierential pressure operable type, but at best this is subject to well-known variations inherent in useof this counterforce even if no cam or wearable part be applied to the valve.

The chief object of the present invention is to .provide compensating means which are not wearable, as such parts are usually termed in the governor art.

The chief feature of thepresent invention consists in connecting a compensating load spring and rigid link in series and pivoting the other end of the link upon the valve shaft operable arm and associating therewith an abutment such that in arm rotation from open to closed valve positions the spring initially elongates linearly and substantially along the line of its position correspondingly tov open valve position. Dependent upon abutment adjustment, in the valve closing direction, the pivoted link and arm are then rigidized by the abutment and thereafter have no relative movement in further valve movement toward closed position.

This action 'is translated to the spring to progressively, according to a trigonometric function, vary-the force direction and rate of spring elongation.

I-Ierein the initiallineof thespring force relative to a plane including the shaft axis and link .pivotiis an acute or right angle relationship at .open valve position. .At closed .valve position the aforesaid .line .and .plane approach parallelism.

Other objects and features will be set forth more fully hereinafter.

The full nature of the invention will be understood from the accompanying drawings and the following description and claims.

In the drawings:

Fig. 1 is a central section through a conventional governor throttle body interposed between a carburetor and engine manifold.

Fig. 2 is a top plan view of the throttle body and compensating device cover.

Fig. 3 isa frontelevation of thecompensating device showing the parts in the open valve position.

Fig. 4 is a similar view of the same parts in the closed valve position.

In the drawings C designates the connecting flange of a carburetor and M the connecting flange. of an engine intake manifold. Inter-posed therebetween are the gaskets G and throttle body it with bolt holes ll therethrough and intake passage 12 as well. Bolts B secure the aforesaid together in the usual manner.

In passage 12 is elliptical valve l3 having shaft portions l4 and 140.. These are eccentric of the valve median and also are eccentric of the passage l2 as illustrated. Shaft end Mais suitably mounted in closed bearing Mb. Shaft portion 14 projects through plate 15, an integral portion of the body Ill.

The plate exposed end 11 of shaft 14 is squared or fiatted as at "5 and a T-shaped arm I8 having a complementarily 'socketed portion is rigidly secured to said shaft or end l1. Face plate l5 has holes 40 tapped to receive screws 41 by which cover 42 is secured to the said plate.

Naturally the cover may be of plate type and the base of box type but the form illustrated is preferred since it reduces casting cost for the cover can be of sheet stamped metal.

All the aforesaid is of general velocity governor design. Accordingly reference will now be had to Figs. 3 and 4 wherein the-novel compensating mechanism is illustrated.

In said figures the T-shaped lever arm I'8 has a lateral extension .l9 which is apertured at 190. and threaded to receive an abutment forming bolt 2!] adjustable therein and locked by nut 2| in adjusted position.

The-upper end 18a of the T-shaped lever arm is also apertured and mounts pivot member 22. A link member 23 is 'apertur ed at 24 to receive the hook end 25 o nsi n pr n '26- Th o e end of link arm 23 isslotted ,at 23a 10 straddle portion 18a and pivot member 22 pivotally connects the same together.

Pivotally mounted at 30 upon base (plate) [5 is link rod or arm 29. Its free end is apertured at 28 to receive the other hook end 2! of spring 26. A boss 3|, etc., upon the base I5 is apertured at 31a and threaded to adjustably mount bolt 32 locked in adjusted position by nut 33 as shown.

Running down this bolt lowers the spring connected end of link arm 29 and hence increases the initial loading force of spring 26 to be overcome by the valve. Backing off said bolt reduces this force.

In normal operation link rod 23 initially does not contact abutment in initial clockwise rotation of arm l8. Hence spring 26 elongates linearly and in this way has straight line extension and at its normal rate of extension.

When the valve is further moved toward the closed position, the link 23 contacts the abutment 20, and thereafter same are unitized. When this occurs, not only is the spring extended further, but since the apertured end of link or arm 23 now elevates, as well as moves to the right, this changes (accelerates) the rate of spring extension and direction of application.

Note that as arm l3 moves from open valve position the line of spring action slightly rotates clockwise about pivot (aperture) 28 and toward the valve axis. This is because arm 23 is pivoted at 22. Now when arm 23 engages the abutment 2D, spring end elevates as it were so that while the spring further extends toward the right, the actual line of spring force recedes counter-clockwise because end 25 gradually elevates. Hence a compound action results and the usual straight line function of the spring upon extension is modified.

The foregoing, accordingly, provides a very simple compensating structure devoid of Wearing parts, cams or spring contacting deforming slides,

etc., all or which progressively wear in use and progressively become more and more erroneous in application incident to continued use. Cam wear is difiicult to adjust or compensate for.

However any abutment wear is readily compensatable obviously by advancing bolt 20 the requisite amount.

The two adjustments provided have been found ample to accommodate this device for wide ranges. Of course springs can be interchanged when greater or lesser capacities are desired or required. Since commercially identical springs vary, the adjustment 32 permits variation in initial spring adjustment so that all identical governors can be calibrated to the master governor.

A boss 50 on base 15 is apertured and threaded at El to receive adjustable stop bolt 52 locked by nut 53 in adjusted position. The depending tail portion I32) of the T-shaped lever l8 engages stop 52, see Fig. 2, when in open valve or substantially open valve position as shown in Fig. 2. It, of course, is to be understood, as is the usual practice valve I3 is, at open valve position a few degrees clockwise from the vertical. Stop 52 prevents overcenter positioning of the valve at open valve position.

While the invention has been illustrated and described in great detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character.

The several modifications described herein as well as others which will readily suggest themselves to persons skilled in this art, all are considered to be within the broad scope of the invention, reference being had to the appended claims.

The invention claimed is:

A rate varying yielding resistance unit for the velocity-variable, force-subjected, unbalanced valve of a velocity governor including in combination, a pivotally supported arm subject to variable force and tending to pivot when subject thereto and in accordance therewith, an anchorage appreciably spaced from the arm pivot axis, a rigid member pivoted to the arm remote from the arm pivotal axis and bodily movable with the arm, a single tension spring connected at opposite ends to the free end of the rigid member and the anchorage and constituting the sole movable connection therebetween, and always subject to linear modification, and abutment means juxtapositioned to the connection between the member and the arm and carried by one of the member and arm and contactable by the other thereof only when the member and its supporting arm have had an initial movement, the anchorage comprising a rigid member pivoted at on end and having its other end connected to an end of the spring, and adjustable stop means for limiting pivotal movement and determining the initial position of the anchorage member.

2. A rate varying yielding resistance unit for the velocity-variable, force-subjected, unbalanced valve of a velocity governor including in combination, a pivotally supported arm subject to variable force and tending to pivot when subject thereto and in accordance therewith, an anchorage appreciably spaced from the arm pivot axis, a rigid member pivoted to the arm remote from the arm pivotal axis and bodily movable with the arm, a single tension spring connected at opposite ends to the free end of the rigid member and the anchorage and constituting the sole movable connection-therebetween, and always subject to linear modification, and abutment means juxtaposi tioned to the connection between the member and the arm and carried by one of the member and arm and contactable by the other thereof only when the member and its supporting arm have had an initial movement, the arm being substantially T-shaped, the member being connected to an end of the head of the T, and adjustable stop means spaced from the axis of the arm and engageable by the other end of the head of the T for arm initial position determination when the spring is not extended by the variable force.

HERBERT C. MINNIEAR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,915,188 Klemm June 20, 1933 2,024,296 Larsen Dec. 17, 1935 2,127,521 Kemp Aug. 23, 1938 2,242,832 Mennesson May 20, 1941 2,356,202 Benjamin Aug. 22, 1944

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