DE1954834A1 - Centrifugal governor for internal combustion engines - Google Patents

Description

R. 9662
October 28, 1969 Ks / IO)

Attachment to

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HUBERT BOSCH GMBH, 7 Stuttgart 1, Breitscheidstrasse 4-

centrifugal speed refi'ler for fuel injection

machinery

The invention "relates to a centrifugal governor for Injection internal combustion engines with a speed-dependent adjusting control element (control sleeve), its control movements on one with the delivery line adjustment member of the injection pump connected and pivotable about an axis fixed to the housing intermediate lever are transferred and that against a return spring under the force of at least one standing force transmission member acts.

109819/0958

Robert Bosch GmbH R. 9662 Es / Kb

Stuttgart

Injection engines, especially those for driving Motor vehicles work in a wide speed range. The injection pumps attached to these engines are in In many cases, they are provided with controllers that, in addition to speed control, have the task of those set in full load operation Maximum fuel quantity over the largest possible speed range to change so that they demanded the engine and for a smoke-free combustion or for a special one Use case corresponds to the flow rate curve specified or very close (approximation).

Known speed controller of the type described at the beginning (German patent specification 1 011 225 and 1 080 814) have for Adaptation of the amount of fuel delivered by the injection pump to the full load characteristics of the engine a spring capsule existing leveling device between Power transmission link and regulator sleeve. This device works so that with increasing speed depending on the bias and stiffness of the spring built into this spring capsule the delivery rate adjustment member of the injection pump in the direction "Stop" is moved. This increases the delivery \ ing of the injection pump decreased by a predetermined amount.

However, this device has the disadvantage that the maximum amount of fuel with increasing speed it can only be changed in the direction of a smaller amount, while increasing or kinked, i.e. first rising and then falling or first falling and then rising flow rate curve cannot be achieved with this facility.

109819 / 09B8

Eobert Bosell GmbH E. 9662 Ks / Kb

Stuttgart

There are already devices "known" that allow the control of any flow rate curve, for example by means of a cam (USA-Pat ent writing 2 259 693 and German patent 1 010 321) with controllers of a different design than the one described. These facilities can not be applied ohcT for controllers of the above-described type.

The invention is now based on the object of a centrifugal force governor of the type described at the beginning with a To provide device that makes it possible to track the flow rate to control the injection pump so that when the speed changes the maximum fuel quantity can be changed in any direction and size within a specified speed range is, if necessary, the direction of the flow rate change within the speed range reversible at least once is.

This object is achieved according to the invention in that as Adjustment device between control element and power transmission element a rocker arm which transmits the movements of the control element to the intermediate lever and which is connected to at least two stop surfaces is pressed against corresponding stops arranged on the force transmission member, from at least one of which is resilient and of which one serves as a fixed point during tilting movements of the rocker arm, and that the rocker arm is articulated with its one end remote from the stop surfaces on the intermediate lever.

A particular embodiment of the invention is such that the rocker arm between the pivot axis of the intermediate lever and its connection point with the delivery rate adjustment member is hinged to the intermediate lever.

109819/0958

.4-

Robert Bosch GmbH R. 9662 Ks / Kb

Stuttgart

Another embodiment of the invention is such that a first resilient stop in extension of the control element axis is arranged and that above this first stop as a fixed point, a second stop serves as a screw bolt can be determined in any desired position. With such a controller, the full-load delivery rate can be controlled so that it increases or decreases with increasing speeds, or first decreases and then increases again in the upper speed range.

However, if the full-load delivery rate is to first increase and then decrease with increasing speed, are in a further embodiment According to the invention, a first resilient stop as an extension of the control element axis, a second resilient stop above the first between the control element axis and the connection of the rocker arm and intermediate lever and a third fixed stop adjustable below the first. ".

A particularly advantageous embodiment of the invention is achieved in that the rocker arm has two stop surfaces has, which are arranged above or below the control element axis and against two also above or below the control member axis arranged stops act. With this controller, all desired alignment processes can be implemented.

In the drawing, three exemplary embodiments of the subject matter of the invention are shown.

Fig. 1 shows the first

Fig. 2 the second and

3 shows the third example, each in a schematic representation;

4 and 5 show diagrams with possible adjustment or Control curves.

—5—

109819/0958

Robert Bosch GmbH E. 9662 Ks / Kb

Stuttgart

In the first exemplary embodiment, there is 10 on the camshaft an injection pump, not shown, for internal combustion engines a driver part 11 attached to the Fliehgexd.ch.te 12 are pivotably mounted. These attack with arms 13 the running surface 14 - a regulator sleeve 15 serving as a regulating member, which has an inner bore 16 on a cylindrical Pin 17 of the camshaft 10 is guided. On the end face 20 of the regulator sleeve 15 opposite the running surface 14 An intermediate lever 22 is supported via a roller 21 and is pivotable on a bearing pin 26 fastened in the controller housing 15 is stored. The roller 21 is mounted on a rocker arm 27, articulated by a bolt 28 with the Zxri.schenh.ebel 22 is connected and by the force of a spring 29 in its rest position on a stop pin 30 of the intermediate lever 22 is present. The intermediate lever 22 is connected via a bracket 31 a control rod 32 of an injection pump serving as a feed quantity adjustment member. One at the end of the intermediate lever 22 acting tension spring 35 serves as a backlash compensation spring and at the same time strives to the control rod 32 in the To adjust a larger injection quantity and therefore also acts as a starting spring.

Pivoting movements of the rocker arm 27 about its pivot point 28 take place against the return force of the spring 29 and are limited by an attached to the intermediate lever 22. Limiting nose 33 »which prevent the motor from running away should if the spring 29 breaks. The starting spring 35 would namely in the absence of a spring 29, the intermediate lever 22 in the sense of a Shift the flow rate increase. The limiting nose 33 is attached so that the rocker arm 27 to adjust tilt angle required for the delivery rate. The effect of this tilting or pivoting movement is further below described in more detail.

10981 9/0958

Robert Bosch GmbH E. 9662 Its / Kb

Stuttgart

On the bearing pin 26 is outside? the intermediate lever 22 still a one-armed support lever 37 pivotally mounted, which the power transmission member for a return spring 38 serving as a speed control spring. The return spring 38 is a tension spring and is at one end on the support lever 37 and with her the other end is hung on a pivot lever 39, which with a in the controller housing 25 rotatably mounted shaft 40 is connected. The pivot lever 39 is connected via the shaft 40 to an operating lever 41 located outside the controller housing 25, whose end position is marked by a screw 4-2 and determines the maximum speed regulated by the controller. The position of the support lever 37 when the Eegelfeder is pretensioned 38 is fixed by an adjusting screw 4-3. In order to the suspension point 44 of the control spring 38 is determined and also, as described in more detail below, the full-load starting position of the control rod 32.

An additional idle control spring adjustable in the controller housing 25 45 protrudes through a recess 46 in the support lever 3V through and influences the movements of the intermediate lever in the idle control range via a surface 47 on the rocker arm 27 22nd

The support lever 37 has two protruding dimensions "a" and "b" set stops 49.51? of which the upper one from one There is screw 50 with lock nut 52 and 'a fixed stop 49 forms for a stop surface 53 of the rocker arm 27, while the lower one is arranged as an extension of the camshaft 10 and essentially consists of a stop bolt 55 and one i'eder 56 and as a resilient stop 51 for a stop surface 57 is used, which is formed by the outer diameter of the roller 21 mounted on the rocker arm 27.

—V—

109819/0958

_ ₇ "195 A 834

Robert Bosch GmWI R. 9662 Ks / Kb

Stuttgart

Projecting dimension "a" of the stop 49 and projecting dimension "b" and spring force of the stop 51 and the effective range of the idle control spring 45 can be closed by a cover 58 with a Opening 59 of the regulator housing 25 can be adjusted.

The protrusion dimension "a" is adjusted by turning the screw 50 is rotated accordingly and secured by the nut 52. The protrusion dimension "b" can vary in strength by exchanging it Discs 54- can be adjusted, or the stop 51 can be in known, not shown V / iron in a screw sleeve are installed, which in turn is adjustably mounted in the support lever 37 and secured by a lock nut can.

The second embodiment according to FIG. 2 differs of the first as follows: The support lever 37 has next to the resilient stop 51 instead of the fixed stop 49 of the first example a second resilient stop 60 which, like stop 51, has a stop pin 61 and a spring 62. Below the axis of the camshaft 10 and below the resilient stop 51 is a third and fixed stop 63 a screw 65 secured by a lock nut 64 is attached. This third stop 63 cooperates with a stop surface 66 on the rocker arm 27 '. The attacks 51 * 60 and 63 can be adjusted to the protruding dimensions "b, d, e".

In the third embodiment shown in Fig. 3, the support lever 37 ″ is on a special bearing pin 70 in the upper part of the control housing 25 ″, while the intermediate lever 22 ″ like the lever 22 in FIGS. 1 and 2 in the lower Housing part on the bearing pin 26 is pivotable. Deviating from the embodiment according to Fig. 1 or 2, the rocker arm 27 "

-8th-

1 0 9 8 1 9/0 9 B 8

Robert Bosch GmbH E. 9662 Ks / Kb

Stuttgart

articulated both to the intermediate lever 22 ″ and to the kegler sleeve 15 ″ by means of a bolt 71. An elongated hole 72 · in the lower Part of the intermediate hoist 22 ″ allows this little vertical Perform evasive movements, including when the Rocker arm 2? » tilts about the bolt 71. The rocker arm 27 ″ has two stop surfaces 75 »76, one above and the other below the center of the camshaft 10. These stop surfaces 75} 76 are two stops 77-78 in intermediate lever 22 ″ opposite.

The three embodiments of the subject invention according to "Figures 1 to 3 make it possible to use the full-load fuel quantity of the injection pump through speed-dependent control path changes the maximum amount of fuel that can be burned smoke-free by the engine or is required for a special application to match.

To adjust the full load quantity, for example, the following adjustment processes controlled by the controller are required or possible:

I. With increasing speed, the delivery rate decreases, i.e. shift the control rod position in the "stop" direction by a predetermined amount within a specified speed range,

II. With increasing speed, increasing delivery rate,

III. with increasing speed first decreasing and then increasing and

IV. With increasing speed, first increasing and then decreasing delivery rate .

10981 9/0958

Robert Bosch GmbH R. 9662 Ks / Kb

Stuttgart

These four possible matching curves are shown in the diagrams according to FIGS. 4 and 5, the speed "n" being plotted on the abscissa and the delivery rate "Q" or the position of the control rod "R" being plotted on the ordinate. It is assumed that the position of the control rod ¹¹ R "is a measure of the amount of fuel delivered by the injection pump. ¹¹ Q". These equalization curves then represent the delivery rate as a function of the speed. The equalization curve I is shown in FIG. 4 by the thick line AB, the equalization curve II by CB, the equalization curve III in FIG. 5 by DEF and the equalization curve IV by DGF . The dashed lines HED or HKA, HKL or HKC show the control path curve in the lower speed range when the controller controls the excess fuel required for starting. If no start quantity is required, the control rod follows, for example, the line ΓΙ-Α (Fig. 4).

The length of the route H-K is determined by the preload of the starting spring 35 given.

If the controller does not carry out any adjustment movements, its follows Control curve, for example, the line H-K-L-B in Fig. A-. The control curve for limiting the maximum speed is denoted by B-P and F-P in FIGS. 4 and 5, respectively.

The operation of the controller is described below, whereby especially the operation of the essentially consisting of the rocker arm 27,27 ', 2? » and the stops 4-9,51,60,63,77,78 existing Adjustment device is explained.

-10-

109819/0958 _BAD

Robert Bosch GmbH R. 9662 Ks / Kb

Stuttgart

In Fig. 1, the flyweights 12 are drawn in the rest position, the operating lever 41 rests against the stop 4-2 and over the Swivel lever 39 is the control spring 38 to limit the preloaded at maximum speed. By the force of the control spring 38, the support lever 37 is against the head 43a of the adjusting screw 43 pulled and held in this position. The S-Gartfeder 35 has the intermediate lever 22 and the tab 31 brought the control rod 32 into the position in which the Injection pump delivers the maximum amount of fuel required to start the internal combustion engine (H in Figs. 4 and 5) ™ Has the engine started after starting and runs with the Speed n1 to, then the flyweights 12 have shifted the regulator sleeve 15 and the roller 21 so far that the roller

21 with its stop surface 57 on the face 51a of the Stop 51 is applied. Sleeve 15 and roller 21 have the path "c" run through and the control rod 32 is, for example, in Point C (Fig. 4). There roller 21 and rocker arm 27 via the spring 29 and stop pin 30 frictionally with the intermediate lever

22 are connected, each movement of the roller 21 caused by the sleeve is corresponding to the effective lever ratio transferred to the control rod 32.

) If the controller is to control alignment curve II (increasing Delivery rate), the stop 49 is set to such a protrusion "a" that it touches the stop surface 53 on the rocker arm 27 is touched when the path "c" has been traversed. If the speed increases beyond n1, then overcomes the sleeve force is the bias of the spring 56 of the stop 51, the stop bolt 55 gives way to the right and the protrusion dimension "b" is shortened. Simultaneously with the bias of the spring 56, the increasing sleeve force also overcomes the force the spring 29 and the rocker arm 27 tilts about the momentary pivot point that of the stop surface 53 and of the fixed stop 50 is formed. Because the rocker arm 27 is above the two

-11-

109819/0 958

Eobert Bosch GmbH R. 9662 Ks / Kb

Stuttgart

Attachment surfaces 53 "and 57 through the bolt 28 on the intermediate lever 22 is articulated, the pivot point moves in this case 28 according to your lever law to the left and the control rod 32 is in the sense of an enlargement of the Displacement shifted (see curve C-B in Fig. 4).

A softer spring 56 with a higher bias can with the described arrangement of the stop also achieve an alignment curve according to C-S-T-B in FIG. 4.

If an adjustment is to take place according to the adjustment curve I (falling delivery rate), the stop 49 is removed or so far back that it no longer has any effect. Only the stop faces work with this setting 57 and the stop 51 together and the socket force can compress the stop 51 by the distance "b". The rocker arm 27 remains connected to the intermediate lever 22 in the position shown, the intermediate lever 22 follows the Movements of the roller 21 and the delivery rate are reduced in accordance with the curve profile A-B in FIG. 4.

In order to achieve a matching curve III (only falling then rising), the protruding dimension "a" of the stop 49 becomes like this set that first a partial path of the protrusion dimension "b" is passed through, then the surface 53 strikes the stop 49 and then the remaining path of "b" is overcome at simultaneous tilting of the rocker arm 27 about its point of contact with the stop 49 «This alignment follows the Line D-E-F in Fig. 5

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109819/0958

Robert Bosch GmbH E. 9662 Ks / Kb

Stuttgart

The alignment curve IV (see line D-G-F in Fig. 5) is achieved with the controller design according to Fig. 2. the Projecting dimensions "b" and "d" of the stops 51 and 60 are like this set that after taking back the starting amount (K-D in Fig. 5) or after going through the path "c" both stop surfaces 53 and 57 at the same time on the stops 51 and 60 are applied. Between the fixed stop 63 and the However, stop surface 66 is reduced by a distance "f" by a partial route corresponding to the route C covered. In addition, the biasing force of the spring 56 is lower than that of the spring 62. If the speed now increases beyond n1, then first the spring 56 gives way, the stop 60 acts as a fixed stop, and the rocker arm 27 ' tilts about from the stop surface 53 and from the stop formed momentary pivot point, the delivery rate increases (D-G). Is in point G of the diagram of FIG Speed n3 reaches the maximum permissible full load quantity, the rocker arm 27 'has the V / eg in the area of the stop 63 "f" covered and the stop surface 66 strikes the fixed stop 63. When the speed is increased further, the sleeve works against both resilient stops 51 and 60 and the Rocker arm 27 'tilts around the new current pivot point formed by stop 63, with the delivery rate again decreases. At the final speed n2 (point f in Fig. 5) the alignment ended.

With the embodiment of FIG. 3 can all set the four described alignment curves I-IV and steer.

With an alignment according to A-B in Fig. 4 (alignment curve I) the upper stop 77 yields resiliently (spring travel "h"),

109819/0958

EoTdert Bosch GmbH R. 9662 Ks / Kb

Stuttgart

"and the lower stop 78 acts as a fixed pivot point. Er can in this case be very highly preloaded and blocked or replaced by a fixed bolt.

An alignment according to C-B in Fig. 4- (alignment curve II) can be realized if the lower stop 78 gives way (Spring travel "g") and the upper stop 77 acts as a fixed pivot point.

Does the controller equal the delivery rate according to the bent curve D-E--]? in Fig. 5 (alignment curve III) when between the Speeds n1 undr ^ first the stop 77 by the distance "h" evades, and then the stop 78 around between n3 and n2 the V / eg "g".

A reverse flow rate curve according to D-G-F in Fig. 5 (Matching curve IV) is achieved when the resilient stops 77 and 78 in reverse order as straight work described. First the stop 78 gives way and then the stop 77 off.

By using two springs instead of one spring 56,62 in the resilient stops 51 »60,77» 78 the alignment process can also be adjusted.

In all cases described, the controller regulates after reaching the final speed n2, because then the Sleeve force on the control element 15 * 15 'the preload of the control spring 38 and the support lever 37.37 "moves to the right

109819/0958

1354834

Robert Bosch GmbH W ' R. 9662 Ks / Kb Stuttgart

away from the head 43a of the adjusting screw 4-3. This evasive movement is followed by the intermediate lever 22, 22 ", since it is carried along by the rocker arm 27, 27 ', 27", which is articulated against the support lever by a hoof force, and the intermediate lever 22, 22 "pulls the control rod 32 to" stop "(line BP in Fig. 4- or PP in Fig. 5). '-

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BATH

109819/0958

Claims (5)

Bcbert Bosch GmbH ™ E. 9662 Ks / Kb Stuttgart Expectations [Loan speed governors for fuel injection engines - With a speed-dependent adjusting Eegel member (Eegler sleeve), whose Eegel movements on one with the Flow rate adjustment element of the injection pump in connection standing and pivotable about an axis fixed to the housing intermediate lever are transferred and this against a under the force of at least one return spring Force transmission member acts, characterized in that that as an adjustment device zv / ischen Eegel member (15.15 ") and power transmission member (37.37") a d-ie movements of the Eegel member (15,15 ") on the intermediate lever (22,22") transmitting rocker arm (27,27 ', 27 ") is arranged, the with at least two stop surfaces (53,57,66,75,76) arranged against corresponding ones on the power transmission member (37,37 ") Stops (49,51,60,63,77,78) is pressed, of which at least one is resilient and of which one each as a fixed point for tilting movements of the rocker arm (27.27 *, 27 ") serves, and that the rocker arm (27,27 ', 27 ") with its one remote from the stop faces end is hinged to the intermediate lever (22,22 "). -16- 109819/0958 Robert Bosch GmbH E. 9662 Ks / Kb Stuttgart 2. centrifugal governor according to claim 1, characterized in that that the rocker arm (27,27 ', 2? ") between the Pivot axis (26) of the intermediate lever (22,22 ") and its Connection point with the delivery rate adjustment element (32) lever
is hinged to the intermediate / (22.22 "). 3. Centrifugal governor according to one of claims 1 or 2, characterized in that a first resilient stop (51) is arranged as an extension of the control element axis is and that above this first stop (51) as a fixed point, a second stop (49) serves as Screw bolt (50) can be locked in any desired position (Fig. 1). 4-. Centrifugal governor according to one of the. Claims 1 or 2, characterized in that a first resilient stop (51) in extension of the control element axis, a second resilient stop (60) above the first between the control element axis and the connection of the rocker arm (27 ¹ ) and intermediate lever (22) and a third fixed stop (63) are arranged adjustable below the first (Fig. 2). 109819/0958 Robert Bosch GmbH R. 9662 Ks / Kb Stuttgart 5. Centrifugal governor according to one of claims 1 or 2, characterized in that the rocker arm (27 ") has two stop surfaces (75-76) which are arranged above or below the control element axis and against two also above or below the . control element axis arranged stops (77,78) act (FIG. 3) _iy, l / h. 109819/0958