US1974858A - Centrifugal governor for internal combustion engines - Google Patents

Description

SepLZS, 1934. o. BAUR. ET AL CENTRIFUGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES 1932 2 Sheets-Sheet 1 Filed April 25 CENTRIFUGAL GOVERNOR FOR INTERNAL COMBUSTION ENGINES Sgpt. 25, I934. 0. BAUR ET AL.

Filed April 25, 1952 2 Sheets-Sheet 2 Patented Sept. 25', I934 1,914,858 I CENTRJFUGAL oovnaNoa" Foa cormns'non nNGnmsI Ottmar Baur, Stuttgart, and Johannes wet,

Feuerbach, Germany; ',assignors W Robert Bosch Aktiengesellschaft, Stuttgart, Germany Application April 23, 1932, Serial No'. 607,134 In GermanyApril 28, 1931 6 Claims. (o1. 1239-149 f The present invention relates to centrifugal governors for internal combustion engines, more especially solid injection Diesel motors, which are designed to prevent a maximum speed being ex- I ceeded as well as to prevent the speed of the motor dropping below a minimum speed. The object of the invention is to improve on the centrifugal governors hitherto employed.

One example of construction of a governor ac- 10 cording to the invention is illustrated in the accompanying drawings, in which:--,

Figure 1 is a longitudinal sectional view of the governor with its operating rods, a partial elevational view of a fuel pump with which the governor is shown as used, and pedal-operated mechanism for an adjustment of the fuel control member of the pump in addition to the governor adjustment.

Figure 2 a sectional view of the bearings of the 2o eccentric shaft in the governor casing. v

Figure 3 is a perspective view of the eccentric shaft and associated partsshowing a lever connected with the governor sleeve.

The centrifugal governor is mounted on the conical stub a of the shaft of the fuel pump, and secured by means of a locked nut or the like. The governor consists of a governor body b, which carries on its periphery two centrifugal weights 0.,

These weights stand under the influence of two springs d1 and dz,-the tensions of which are designed to correspond to the extent of control required for running idle and under full load respectively. The initial compressions andconsequent tensions of the governor springscan be adjusted by adjustable spring plates e. The relatively weak springs d1 engage between the adjustable spring plates e and the bottoms of the weights .0 so that the springs 111 are always operative on the weights but the relatively strong springs (12 engage between the spring plates 8 and apertured spring plates u loosely mounted on the stay bolts and engaging fixed collars on those bolts, as shown in Fig. 1, so that the stronger springs da do not begin to operate on the weights until the idling speed has been exceeded and the weights have moved radially outward sufficiently for their apertured bottoms to' clear the collars on the bolts and engage .the spring plates u. Each governor weight is connected by a bellcrank lever, which for the sake of cleamessis only indicated in Fig. 1 in broken lines, to the axially guided cross pin or bolt ,f. This cross-pin is connected with the governor sleeve i by a slide a which is axially guided in the bush h, and to this sleeve is pivoted the twoarmed lever is by means of a pivot block 1.

The two-armed lever k is revoluble on an eccentric disc m, the axis of which is mounted in bearing bushes m, n: screwed from the outside in the wall of the governor casing. To the upper arm of the two-armed lever k is connected the connecting rod p which connects the governor with the controlling rod-jqof the fuel pump.

A casinjg'o enclgtes both the governor as well as the transmissiohparts between the governor and-the controllii'i'g'rod of the pump in such a manner as to 'be dust aiid water-tight. The casing is-divided in. such a .way that after taking off the cover the whole of the transmission members are freely accessible from all sides. A flexible sleeve! is ins'ertediu the space between the point where the coupling rod p emerges from the governor casing and the guide for the controllingirod q so as toenclose said space.

As Figurez'shows, a 'lever t is fastened on the eccentricshatt 8 outside the governor casing o, to which lever'therod of the fuel pedal is connected.

The governor device hereinbefore described and shown in the drawings works as follows:

When the engine is running idle, in which case 30 the fuel pedal is in the position shown, that is, at rest, then the-centrifugal weights 0, under the slight compression of thegovernor springs d1 intended. for running light, fly out to a small extent, whereby the controlling rod q is so adjusted 5 through the" parts I, g, i, l, k, 11, that the fuel pump only feeds as much fuel as is necessary for the maintenance ofthe low engine speed. As the speed when running light increases, the throw of the centrifugal weights increases and the governor sleeve is drawn to the right. The twoarmed lever is is thereby turned about the eccentric disc m as the fixed pivot point and moves the regulating rod q to the left, that is in the closing or stopping direction. The injection of fuel is diminished and thus the engine speed becomes lower.

By stepping on the fuel pedal, the eccentric disc m is rotated by the rods connected with it and the lever t to such an extent that the lever k displaces thecontrolling rod q to the right, that I is, into the opening, or accelerating direction. In this voluntary adjustment the pins serving for the pivotal connection of the pivotal block I and the two-armed lever is thus form the fixed 10 axis of rotation.

If the fuel pedal is depressed more or for a longer period correspondingto the lmatd on the engine, the'speed of the engine and thus the energy of the centrifugal weights 0 increases in such a way that it overcomes the strong governor springs (12, and moves the governor sleeve to the right, whereby an adjustment of the controlling rod (1 is effected in the closing or decelerating direction.

Of course, the various parts can be otherwise constructed and arranged; thus, for example, instead of the governor being arranged on the shaft of the fuel pump it may also be arranged on the engine (not shown). Furthermore, if desired, the connecting rod 1) could be arranged to be adjustable in length, so that at a certain position of the governor the suitable position of the controlling rod q of the fuel pump, that is to say, for the corresponding quantity of fuel sprayed in, can be adjusted. Also the invention is not limited to a certain form of the centrifugal weights. Finally, it is optional to connect that arm of each bellcrank lever which is directed towards the axis of the governor directly with the governor sleeve 1', and the latter may then be arranged axially displaceable on a shaft end.

Preferably, however, the various parts are arranged as shown in the drawings as certain advantages arise from that arrangement. The apertures in the casing walls, through which the bearing bushes n1 n2 extend are, as shown in Fig. 2, of such diameter as to allow passage of the eccentric m as well as the shaft 3 there'- through in assembling the parts. As also shown in Fig. 1, the casing is a two-part or divided casing with a rear portion, to the right inFig. 1, and a front portion or cover. This arrangement not only provides a dust and moisture proof casing about the governor and its connections with the fuel-control member of the pump, but also enables the pump with all the governor parts to be initially assembled as a whole and attached as a unit to the engine, and likewise as a unit disengaged from the engine for inspection and the pump as shown in that view, and then the governor body or hub b secured on the projecting end a of the pump shaft and the weights mounted in position and the springs adjusted. Before the cover portion of the casing is placed in position, the governor is thus sufficiently exposed for the ready connection thereto of the remaining parts. The bell crank levers may then be connected to the fly weights c and to the cross pin or bolt 1', the governor sleeve i mounted on the end of the slide 9 and the latter threaded through the bushing it and the bushing secured in place on the governor body, the floating lever k pivotally mounted on the governor sleeve 1' through the pivot block 1, and the upper end of that lever connected, through link rod p. to the fuel control rod 1; of the pump. Then all that remains to be done, is the placing of the cover portion of the casing in position, with one of the bushings m 11.2 in its sides removed, and the endwise insertion through the exposed aperture and through the hub portion of the lever it (see Fig. 3) of the shaft s with the eccentr c 1n thereon until the far end of the shaft extends into the bearing apertm'e of the opposite bushing and the eccentric m is properly located in the hub portion of the lever k, and finally, the external pedal rod is connected, by the arm t, Fig. 2, to the end of the shaft s projecting from one side of the governor casing.

We declare that what we claim is:

-1. A speed regulator for solid injection internal combustion engines comprising an adjustably movable fuel control member, a floating lever mechanically connected to said fuel control member for adjustably moving the same, manual means for voluntarily operating said lever to adjust the fuel supply, said means being connected at a point on said lever spaced from the connection between said lever and said fuel control member, and a centrifugal governor connected at another point on said lever spaced from said first-mentioned point and adapted to control the fuel supply'to prevent the engine speed from ris ing above a given maximum value and from descending below a given minimum value, said lever being adapted to pivot about an axis passing through either one of its points of connection to said manual and centrifugal controls according to the operation of said controls.

2. A speed regulator for solid injection internal combustion engines comprising. the combination, with a fuel pump having a movably adjustable fuel control member and a shaft projecting beyond the pump casing, of .a floating lever mechanically connected to said fuel control member and having a journal bearing spaced from said connection, a manually displaceable control member, a rotatable shaft connected to said manually displaceable control member, an eccentric on said shaft journalled in said bearing formed in said lever, and a centrifugal govemcr mounted on the projecting end of said pump shaft and driven thereby and connected to said lever at a point displaced from the bearing for said eccentric.

3. A speed regulator for solid injection internal combustion engines comprising the combination, with a fuel pump having a movably adjustable fuel control member and a pump shaft projecting outwardly of the pump casing, of a governor mounted on the outer end portion of said pump shaft and driven thereby, a removable casing supported by said pump casing about the outwardly projecting portion of said pump shaft and entirely enclosing said governor, connection means wholly within said casing operatively com nesting said governor with said fuel control member for movement of said member, and means for voluntarily adjusting said fuel control member comprising a shaft rotatably journaled in side walls of said casing, manually operable means detachably connected to said shaft outside said casing for turning said shaft, and an element on said shaft within said casingoperating on said connection means to adjustably move said control member independently of said governor.

4. A speed regulator for solid injection internal combustion engines comprising the combination, with a fuel pump having a movably adjustable fuel control member and a pump shaft projecting outwardly of the pump casing, of a governor 14o mounted on the outer end portion of said pump shaft and driven thereby, means connecting said govemcr with said fuel control member comprising a lever having a journal bearing intermediate its length and means connecting one end of said lever to said governor and the other end of said lever to said control member, a removable casing supported on said pump casing about the outwardly projecting portion of said pump shaft and enclosing said governor, lever and connecting means, a shaft rotatably journaled in side walls of said casing and an eccentric on said shaft engaging in said lever bearing, and manually operable means detachablysecured to said shaft outside said casing for turning said shaft.

5. A speed regulator as in claim. 4 and in which said casing is provided with aligned openings in opposite walls thereof adapted to receive bearings for said rotatable shaft, said openings being sufliciently large for the endwise insertion therethrough into operative relation with said leger within the casing of said shaft with said eccentric thereon.

6. A speed regulator for solid injection internal combustion engines comprising an adjustably movable fuel control member, a floating lever mechanically connected to said fuel control member for adjustably moving the same, manually actuated mechanism and a centrifugal governor so connected to said lever at points spaced from each other'and from the connection of said lever to said fuel control member as to render said mechanism operable to move said lever about the point of connection thereto of said governor as a pivot and said governor operable to move said lever about the point of connection thereto of said mechanism as a pivot, saidm'echanism being adapted upon actuation to move said control member through said lever to adjust the fuel supply forthe entire range of engine speeds from idling to full load running and said governor having centrifugal-weight and spring means operating on said control member through said lever at idling and full load running to prevent the engine speed from rising above a given maximum value for idle running and above a given maximum value for full load running and inoperative on said control member at an intermediate range of speed.

OTIMAR BAUR.

JOHANNES WEBER.

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