J1me 20, 1961 L. JAENTSCHKE ETAL 2,988,922 CENTRIFUGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES

Filed Sept. 21, 1956 2 Sheets-Sheet l

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June 20, 1961 |_. JAENTSCHKE ETAL 2,988,922 CENTRIF'UGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES

Filed Sept. 21, 1956 2 Sheets-Sheet 2

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2,988,922 - CENTRIFUGAL GOVERNOR FOR INTERNAL .

COMBUSTION ENGINES Leopold Jaentschke, Stuttgart-Bad Cannstatt, and Robert

Binder, Stuttgart-Zulfenhausen, Germany, assignors to Firma Dr. Ing. h.c. F. Porsche K.G., Stuttgart-Zul‘r‘en hausen, Germany

Filed Sept. 21, 1956, Ser. No. 611,112 Claims priority, application Germany Oct. 7, 1955 ..

'6 Claims. (Cl. 73—541)

‘The present invention relates to a centrifugal ~governor for internal combustion engines, especially stationary mo tors which comprises an adjusting spring for adjusting the centrifugal governor to any desired control responsiveness as regards the number of rotations.

In known prior art constructions the control sleeve which is actuated by the centrifugal weights is under the in?uence of a control spring which is formed by one or several helical pressure springs arranged concentrically to the sleeve. '

' In other known constructions a return spring opera tively connected with the adjusting lever is provided for purposes of setting the governor to the desired rotational speed of the engine. In order to obtain a su?icient spring volume, these types of springs, i.e., the coil springs, become necessarily long and wide whereby the protected accommodation thereof is not possible or possible only with the aid of a separate special spring bell-shaped member. _ o p "

Furthermore, the adjustment of the control member by means of helical springs requires several transmission members as Well as guiding and supporting members which must be machined accurately and which thereby increase the cost of manufacture thereof.

According to the present invention, these disadvantages are avoided in that the control spring is formed by a tor sion spring cooperating-with‘the adjustment lever. Such a construction renders it possible for the fly weights, to gether with the members associated therewith including the control spring, to be accommodated within a limited space whereby a handy adjusting control apparatus of relatively slight dimensions is obtained. The torsion rod spring is torsionally connected with an

adjusting fork actuating the control sleeve. Such a con struction provides a particularly simple and reliable ad justment of the controller in which expensive guide and transmission members are obviated. The torsion rod spring extends through the shifting fork and is secured therein in a readily detachable manner by a tensioning or locking pin whereby the torsion rod spring may be made '* relatively long without having any detrimental in?uence on the dimensions of the housing so that a sui?ci‘ent tor sion angle is available in operation. The most favorable spatial arrangement results if the torsion rod, spring is arranged in the axis of rotation of the adjusting lever and is rigidly connected therewith. An additional spring having an adjustable spring stiffness is coordinated to this torsion rod spring. As a result of such construction, larger rotational speed ranges may be adjusted. Pref erably the additional spring consists of a helical spring ‘which supports itself adjustably in the controller housing. This enables a ?ne adjustment of the controller which makes it possible to regulate aggregates such as genera tors and the like which are responsive and sensitive to variations in the rotational speed thereof.

Accordingly, it is an object of the present invention to provide a centrifugal governor, especially for stationary installations which is simple in construction and offers the possibility of favorable layouts as regards the spatial arrangement thereof.

Still another object of the present invention is the pro

2,988,922

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engines which provides a space-saving arrangement and, which obviates the need for expensive guide means and transmission members‘ requiring accurate machining. A still‘ further object of the present invention is the

provision of a centrifugal governor which is highly sensi~ tive to variations or deviations from a predetermined speed and which makes possible ?ne adjustments and reg-. ulations of the speed. 7

These and other objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawing which shows, for purposes of illustration only, one preferred embodiment in accord-v ance with the present invention and wherein: FIGURE 1 is a side view of a centrifugal governor of

an internal combustion engine provided with a control spring in accordance with the present invention, . FIGURE 2 is a cross-sectional view taken along line

II——II of FIGURE 1, and ' FIGURE 3 is a cross-sectional view vtaken along line,

line III-III of FIGURE 2. ‘ Referring now more particularly to the drawing, where

in like reference numerals designate like parts, reference numeral 1 designates a housing which simultaneously carries the generator 2 of the engine. A centrifugal gov- ernor 3 is arranged within the housing 1. The centrifugal governor 3 consists of two fly weights 4 which act over a sleeve 6 secured to the drive shaft 5 on a control pin 7,‘ as is well known? The control pin 7 is surrounded‘ by a control sleeve 8 and abuts with the free end thereof against a control member 9. The control member '9 which is under the in?uence of the return spring 10'is operatively connected with a shaft 11 which transmits the control movement to an adjusting rod 12. " A shifting fork 14 is operatively connected by means

of guide pins 13 withthe control sleeve 8. The shifting fork 14 is rotatably supported by ‘means of a bushing 15 in an eye 16 of the cover 17 closing the housing 1. The‘ bushing 15 as well as the shifting fork 14 is provided with a bore 18 extending therethrough in which is arranged 'a torsion-rod spring 19 which is secured thereto in a readily detachable manner by a tensioning or locking pin 20. The torsion rod spring 19: is provided with an enlarged

end 21 which is operatively connected with an adjusting lever 22 and is rotatably guided in the bearing bore 23 of the bushing 15 of the shifting fork 14. The shifting fork 14 further comprises a stop or abutment member 24 formed integrally therewith (FIGURE 3) which co-l operates with the additional spring 25. The additional spring 25 is formed by a helical spring which abuts'ad justably in a threaded bushing 26 within the housing 1. The threaded bushing 26 is secured with respect to the housing 1 by means of a nut 27.

- In operation if the shaft 5 rotates, the fly weights 4 are moved radially outwardly as a result of the centrifugal forces, whereby the control pin 7 is forced against the control member 9, as is well known. By the adjustment of the pin 7 and of the control member 9 the control rod 12 is adjusted correspondingly which in turn adjusts over a rod linkage 28 the throttle valve 29 corresponding to the desired rotational speed of the internal combustion engine. For purposes of adjusting a desired preselected rota

tional speed to which the controller is responsive the adjusting lever 22 is actuated whereby the tension of the control spring constituted by the torsion rod spring 19 is changed. The torsion rod spring 19 in?uences over the shifting fork 14 and the control sleeve 8 the effect of the ?y weights 4 on the control member 9 which in turn determines the position of the throttle valve 29. In order to adjust a larger rotational speed adjusting

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range as accurately as possible the additional spring 25 becomes effective over the abutment member 24 after a predetermined annular displacement of the torsion rod spring ‘19. The strength of the additional spring may be changed by loosening the nut 27 and adjustment of the threaded bushing 26. For purposes of adjusting a constant engine speed of

rotation, as is required, for example, with generators, the position of the adjusting lever 22 may be ?xed by a clamping bolt 30. While we have shown and described one preferred em

bodiment in accordance with the present invention, it is understood that the same is not limited thereto. For example, instead of a separate additional spring, the torsion rod spring which forms the control spring may be provided with corresponding abutments. Further more, the controller may be formed as an independent aggregate and may be arranged at any suitable place on the internal‘ combustion engine. We claim:

' l. A centrifugal governor for internal combustion engines comprising an output member, means mounting said output member for pivotal movement, speed-respon sive means operatively connected with said output mem her to control the position thereof in dependence on the rotary speed of said speed-responsive means, said speed responsive means comprising an axially movable member including means having an abutment surface thereon, said abutment surface intersecting the axis of said axially movable member, said output member having a portion intersecting the axis of said axially movable member and abutting said, abutment surface, said governor fur ther comprising an adjusting lever supported in said gov~ ernor, and means including a torsion rod spring torsional. Iy connecting said speed-responsive means with said ad- justing lever to adjustably control the responsiveness of said speed-responsive means in dependence on the posi tion of said adjusting lever, the axis of the said means mounting; said output member for pivotal movement be ing spaced from, the axis of said torsion spring, said speed-responsive means comprising. ?y weights and a control sleeve operatively connected to said fly weights, said. means having an abutment surface thereon being comprised by a projecting pin on said axially movable member, said pin and said axially movable member be ing coaxial, and said. means including a torsion rod Spring, further including a- shifting fork actuating said control sleeve, additional spring means coordinated to said tor sion‘ rod, spring, and an abutment member extending out wardly from said fork cooperating with said additional spring means.

2. A centrifugal governor according to claim 1, where in said additionalv spring means is formed. by a coil spring, and means within said centrifugal governor for adjustably supporting said coil spring, the axis of said coil spring being disposed transverse to the axis: of said speed responsive means.

3. A centrifugal governor comprising an output mem ber, a rotatable shaft supporting said output member,

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4 speed responsive means comprising ?yweights and a movable control sleeve operatively ‘connected to said ?yweights, said movable control sleeve having a control pin, said control pin being in contact with said output member, said governor further comprising means for _op posing movement of. said control sleeve in one direction, said last-named means‘ comprising a shifting fork in opera tive connection with said control sleeve and having a hollow shaft, a torsion rod spring in said hollow shaft and secured to one end thereof, an adjusting lever on said torsion rodi spring, the axis of said torsion rod spring being spaced. from the axis of said rotatable shaft.

4. A centrifugal governor according to claim 3, where in said means for opposing movement of said control sleeve in one direction further comprises a coil spring, adjustable means for supporting said coil spring, and an abutment member on said shifting fork for cooperating with said coil spring. ‘

5. A centrifugal governor according to claim 4, where in said adjustable means comprises a threaded bushing receiving said coil spring.

6'. A centrifugal governor for internal combustion engines comprising an output member, means mounting said output member for pivotal movement, speed-respon sive rneans- operatively' connected‘ with said output mem ber to control the position thereof in dependence on the rotary speed of said speed-responsive means, said gov ernor further comprising. an adjusting lever supported in said governor, and means including a torsion rod spring torsionally connecting said speed-responsive means with said adjusting lever to adjustably control the responsive ness ofv said speed-responsive means in dependence on. the position of said adjusting. lever, the axis of said means mounting said output member for pivotal movement be ing. spaced from. the axis of said torsion spring, said speed-responsive means comprising ?y weights and a control. sleeve operatively connected to said ?y weights, said control. sleeve having a pin thereon in. contact with said output member, said means including a torsion rod spring further including- a shifting fork actuating said control. sleeve, said torsion rod spring extending through said shifting fork, and means for securing said torsion rod to said shifting. fork in. a readily detachable manner.

References Cited in the ?le of this patent

UNITED STATES PATENTS

770,146 Arrasmith ___________ _._ Sept. 13, 1904 1,003,198 Pascall _______________ __ Sept. 12, 1911 ‘1,201,821 Hobart et a1. _________ __ Oct. 17, 1916 1,442,885 Hinkley- _____________ .._ Jan. 23, 1923 2,009,995 Engel et a1. __________ _._ Aug. 6, 1935 2,358,894 Volet _______________ _._ Sept. 26, 1944 2,503,946 Hallett ______________ __ Apr. 11, 1950 2,656,174 Crookston __________ ..- Oct. 20, 1953 2,664,749 Jones _______________ __ Jan. 5, 1954 2,782,881 Roller ______________ __ Feb. 26, 1957