US2988922A

US2988922A - Centrifugal governor for internal combustion engines

Info

Publication number: US2988922A
Application number: US611112A
Authority: US
Inventors: Jaentschke Leopold; Binder Robert
Original assignee: Dr Ing HCF Porsche AG
Current assignee: Dr Ing HCF Porsche AG
Priority date: 1955-10-07
Filing date: 1956-09-21
Publication date: 1961-06-20
Anticipated expiration: 1978-06-20

Description

J1me 1961 L. JAENTSCHKE ETAL 2,988,922

CENTRIFUGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES Filed Sept. 21, 1956 2 Sheets-Sheet l 29 Fig. 7

III 11 June 1961 JAENTSCHKE ETAL 2,988,922

CENTRIF'UGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES Filed Sept. 21, 1956 2 Sheets-Sheet 2 Fig. 3

a 3 o o 4 b /N VE N TOPS LEO/70427 J34N75CHK AND FOBEYT amps? B) and Un t d ta s, g am" 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-Zulrenhausen, Germany Filed Sept. 21, 1956, Ser. No. 611,112 Claims priority, application Germany Oct. 7, 1955 '6 Claims. (Cl. 73541) The present invention relates to a centrifugal -governor for internal combustion engines, especially stationary motors 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 influence 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 operatively 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 sufiicient 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 torsion spring cooperating-withthe adjustment lever. Such a construction renders it possible for the fly weights, together 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 construction provides a particularly simple and reliable adjustment 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 influence on the dimensions of the housing so that a suificient torsion 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. Preferably the additional spring consists of a helical spring which supports itself adjustably in the controller housing.

This enables a fine adjustment of the controller which makes it possible to regulate aggregates such as generators 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 provision of a centrifugal governor for internal combustio 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 sensitive to variations or deviations from a predetermined speed and which makes possible fine 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 accordance 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 IIII of FIGURE 1, and

FIGURE 3 is a cross-sectional view taken along line, line III-III of FIGURE 2.

Referring now more particularly to the drawing, wherein 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 influence 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 cooperates with the additional spring 25. The additional spring 25 is formed by a helical spring which abuts'adjustably 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 rotational 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 influences over the shifting fork 14 and the control sleeve 8 the effect of the fly 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 ents-9 Jam 961.

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 fixed by a clamping bolt 30.

While we have shown and described one preferred embodiment 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. Furthermore, 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-responsive means operatively connected with said output memher to control the position thereof in dependence on the rotary speed of said speed-responsive means, said speedresponsive 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 further comprising an adjusting lever supported in said governor, 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 position of said adjusting lever, the axis of the said means mounting; said output member for pivotal movement being spaced from the axis of said torsion spring, said speed-responsive means comprising. fly 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 being coaxial, and said. means including a torsion rod Spring,

further including ashifting fork actuating said control sleeve, additional spring means coordinated to said torsion rod spring, and an abutment member extending outwardly from said fork cooperating with said additional spring means.

2. A centrifugal governor according to claim 1, wherein said additional 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 member, a rotatable shaft supporting said output member,

speed responsive means comprising flyweights and a movable control sleeve operatively connected to said flyweights, said movable control sleeve having a control pin, said control pin being in contact with said output member, said governor further comprising means for opposing movement of. said control sleeve in one direction, said last-named means comprising a shifting fork in operative 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 rod 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, wherein 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, wherein 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-responsive rneansoperatively' connected with said output member to control the position thereof in dependence on the rotary speed of said speed-responsive means, said governor 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 responsiveness 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 being. spaced from. the axis of said torsion spring, said speed-responsive means comprising fiy weights and a control. sleeve operatively connected to said fly weights, said control. sleeve having a pin thereon in contact with said output member, said means including a torsion rod spring further includinga 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.

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