US3659570A

US3659570A - Centrifugal governor for injection internal combustion engines

Info

Publication number: US3659570A
Application number: US60222A
Authority: US
Inventors: Masao Yoshino
Original assignee: Diesel Kiki Co Ltd
Current assignee: Bosch Corp
Priority date: 1970-08-03
Filing date: 1970-08-03
Publication date: 1972-05-02
Anticipated expiration: 1989-05-02

Abstract

A centrifugal governor for an injection internal combustion engines of the supercharging type. A lever is connected to an interlocking rod to be axially thrusted by the centrifugal force of governor weights, and an oscillating lever opposes the thrust of the interlocking rod and is subjected to the force of a spring. An auxiliary lever has as a supporting point an engaging point with a stopper bolt disposed in the oscillating lever and as acting points first and second pins pivotally connecting the oscillating lever to said interlocking rod. A follower lever displaces a control rod and a spring stretched between the first mentioned lever and the auxiliary lever so that in the supercharged rotation limits of an engine, the control rod is displaceable through the follower lever by means of the thrust of the interlocking rod and the oscillation of the auxiliary lever with respect to the force of the spring acting on the second pin.

Description

United States Patent [151 3,659,570

Yoshino [4 1 May 2, 1972 54 CENTRIFUGAL GOVERNOR FOR 2,767,700 10/1956 Parks ..123/14o INJECTION INTERNAL COMBUSTION ENGINES Primary Examiner-Manuel A. Antonakas Attorney-Larson, Taylor and Hinds [57] ABSTRACT A centrifugal governor for an injection internal combustion engines of the supercharging type. A lever is connected to an interlocking rod to be axially thrusted by the centrifugal force of governor weights, and an oscillating lever opposes the thrust of the interlocking rod and is subjected to the force of a spring. An auxiliary lever has as a supporting point an engaging point with a stopper bolt disposed in the oscillating lever and as acting points first and second pins pivotally connecting the oscillating lever to said interlocking rod. A follower lever displaces a control rod and a spring stretched between the first mentioned lever and the auxiliary lever so that in the supercharged rotation limits of an engine, the control rod is displaceable through the follower lever by means of the thrust of the interlocking rod andthe oscillation of the auxiliary lever with respect to the force of the spring acting on the second 2 Claims, 3 Drawing Figures Patented May 2, 1972 7 3,659,570

2 SheetsSheet l FIG.I

IIIIIIIIIIIIIIIII 7 A 8 a-i Patented May 2, 1972 2 Sheets-Sheet Z FIGZ CENTRIFUGAL GOVERNOR FOR INJECTION INTERNAL COMBUSTION ENGINES This invention relates to a centrifugal governor for injection internal combustion engines with a fuel supercharger, utilizing a conventional centrifugal governer mechanism for increasing supply of fuel corresponding to the supercharged air amount in a diesel engine having a supercharger.

Generally the governors with a supercharger are a compression type governor in use of supercharging pressure in the suction pipe of air (Refer to Japanese Utility Model Publication SHO 35-16401) and a centrifugal governor effecting mechanical supercharging to be operated by a centrifugal force of governor spindle variable with rotation speed (Refer to Japanese Pat. application Sl-IO 40-22394). However, the compression type of the centrifugal governor has had the drawback of delay of response caused from intermediary gas, while the mechanical supercharging system involves the problems of exceedingly large space of installation, high cost, and instability of performance due to complicated construction.

This invention has for its object to provide a centrifugal governor with a mechanical supercharger, which utilized a conventional centrifugal governor, eliminated such delay of response by full mechanical operation and simplifies procedure of operation with very small construction, whereby a very accurate operation can be obtained.

The invention will be illustrated with reference to the drawings, in which FIG. 1 shows a vertical sectional elevation view of a conventional centrifugal governor,

FIG. 2 shows a similar view to FIG. 1 to the governor of which is applied a governor according to this invention, and

FIG. 3 shows an illustrative view of operation of the governot of FIG. 2.

In FIG. 1 is shown a full speed governor for non-supercharging engines of the conventional type. Due to variation of rotation speed of cam shaft 1 in an injection pump not shown, tension force of a governor spring 2 applied on an oscillating lever 3 and thrust by centrifugal force of the governor weight 4 are in equilibrium, so that displacement is caused in the axial direction (horizontally) of a connecting rod 5 which is an intermediary member. The connecting rod 5 is connected by pin 9 with a lower end of a lever 8 suspended revolvably by an upper fixed pin 7 on a cover 6 of the governor. In an intermediate portion of the lever 8 is affixed a pin 10, which is engaged with an intermediate portion ofa follower lever 12 having its lower end pivoted on a lower fixed pin 11 of the cover 6. A link 13 is connected to an upper end of the follower lever 12 and is further connected to a fuel control rod 14. The governor spring 2 is suspended between the middle part of the oscillating lever 3 and an end of a control lever 16 pivotally mounted on a fixed pin 15 of the governor cover 6. The other end of the control lever 16 is connected to an axle pedal 17 through linkage. There is obtained therefore a tension force of the spring 2 equivalent to a stepped amount of the axle pedal 17, whereby operation of a full speed governor can be effected. Thus, the control system comprises a control mechanism in which the above described displacement of the connecting rod 5 due to equilibrium of the thrust of the governor weight 4 produced by rotation and the tension force of the spring 2 revolves simultaneously the lever 8 by pin 10 in the intermediate portion of the lever 8, and control the fuel control rod 14 through a link 13.

The governor according to the present invention compared with the above described mechanism, includes the following features. As shown in FIG. 2, a connecting rod 5a is attached revolvably to a lower end of an auxiliary lever 18 with pin 19. Spring 20 is mounted in tension between upper part 18b of the auxiliary lever 18 and an intermediate portion of the lever 8a so that the upper end 18a of the auxiliary lever 18 and the lever 8a will not separate until the force of the auxiliary lever 18 revolved counterclockwise reaches a predetermined value due to the right hand movement in the drawing of the rod 50 and engages the intermediate portion of the auxiliary lever 18 revolvably with the intermediate portion of said follower lever 12 by a pin 10a. Accordingly, the pin 10 of the lever 8 is omitted and the lever 8a is interlocked with the follower lever 12 through the spring 20, auxiliary lever 18 and pin 100. On the other hand, a boss 3b at the lower end of the oscillating lever 3a is screwed with a stopper bolt 21 abutting the boss 18c between the pin 10a of the auxiliary lever 18 and the intermediate portion of the pin 19 said stopper bolt being affixed at a desired position by a nut 22.

In FIG. 3, point a shows an acting point on the pin 19 of FIG.2; point 12 a fulcrum of the auxiliary lever 18 by stopper bolt 21; point c a fulcrum for the pin 10a; point d a fulcrum for the fixed pin 11; and point e an acting point for the link 13 of the follower lever 12.

Operation of the governor according to the present invention will now be illustrated. Assume that a force produced by the initial tension of the spring 20 pulling the pin 1011 at point e to the right in the drawing is F,, an interval between the forward end 5b of the connecting rod 5a and the oscillating lever 3 when the forward end of the stopper bolt 21 abuts the boss is l; and thrust of the governor weight in the same position is P In FIG.3, the interval 1 in the rotation range of H5 F 55' F 1 is not variable but is constant. When by further rotation, there is produced a relationship of F5 F E- F the connecting rod 5a moves in the direction such that I may diminish and is displaced until l=0. As the auxiliary lever 18 connected to the connecting rod 5a is supported at the point 12 by the stopper bolt 21, the pin 19 is displaced in the distance 1 from the point a to the point 0 when l=0, whereby the auxiliary lever 18 revolves counterclockwise on the fulcrum b. The point c is moved to the point e, on the auxiliary lever 18, then the follower lever 12 revolves counterclockwise as fulcrum on the point d at the lower end thereof and the point e at the upper end is displaced to the point (2,. Therefore, the displacement from the point e to the point e shows the displacement of the fuel control rod 14 corresponding to the supercharged air and the fuel is so much supercharged. The ratio of displacement e of the connecting rod 5a and the fuel control rod 14 at the time of supercharging can nearly be set up as obtained in the formula:

JjE 63715 As hereinbefore described, the centrifugal governor of the present invention is featured by the construction provided only with one auxiliary lever 18, a spring 20, an oscillating lever 3, and a stopper bolt 21. The governor can be manufactured at low cost, spacially same as the conventional governors for non-supercharging engines, and sure in operation because of the simple mechanism. Though the above described embodiment relates only to the full speed governor, the invention, comprises a mechanism for displacing the fulcrum c of the follower lever 12, so that it may have a wider application either in high or low speed governor.

I claim:

1. A centrifugal governor for a fuel injection internal combustion engine of the supercharging type comprising:

a housing,

a connecting rod axially movably mounted in the housing,

governor weights movable outwardly under centrifugal force, such weights mounted to move the said connecting rod axially as the weights move outwardly,

a first lever connected at a point to the connecting rod, said point on the first lever being movable axially with the connecting rod,

an oscillating lever mounted on a pivot axis which is fixed with respect to the housing, said oscillating lever positioned in the path of the connecting rod, a spring attached to theoscillating rod and urging the same in opposition to the axial movement of the connecting rod,

a follower lever mounted for pivoting movement about an axis which isfixed with respect to the housing, a control rod connected to and movable in response to movements of the follower lever,

and an auxiliary lever pivotably connected to both the connecting rod and the follower lever, a second spring urging the auxiliary lever against the first lever in opposition to the force of the governor weights acting on the auxiliary lever through the connecting rod, and a stop element fixed to the oscillating lever and arranged to abut the auxiliary lever at a fulcrum point between the auxiliary lever pivot points before the control rod engages the oscillating lever,

the force of the second spring being such that a predeterstop element comprises a bolt threadedly engaged in the oscillating lever and engaging said auxiliary lever such that the axial position of the bolt relative to the oscillating lever and the fulcrum is adjustable.

Claims

1. A centrifugal governor for a fuel injection internal combustion engine of the supercharging type comprising: a housing, a connecting rod axially movably mounted in the housing, governor weights movable outwardly under centrifugal force, such weights mounted to move the said connecting rod axially as the weights move outwardly, a first lever connected at a point to the connecting rod, said point on the first lever being movable axially with the connecting rod, an oscillating lever mounted on a pivot axis which is fixed with respect to the housing, said oscillating lever positioned in the path of the connecting rod, a spring attached to the oscillating rod and urging the same in opposition to the axial movement of the connecting rod, a follower lever mounted for pivoting movement about an axis which is fixed with respect to the housing, a control rod connected to and movable in response to movements of the follower lever, and an auxiliary lever pivotably connected to both the connecting rod and the follower lever, a second spring urging the auxiliary lever against the first lever in opposition to the force of the governor weights acting on the auxiliary lever through the connecting rod, and a stop element fixed to the oscillating lever and arranged to abut the auxiliary lever at a fulcrum point between the auxiliary lever pivot points before the control rod engages the oscillating lever, the force of the second spring being such that a predetermined force of the governor weights applied to move the control rod axially, the auxiliary lever will turn about said fulcrum against the force of the second spring and thus through its pivot connection to the follower lever, turn the follower lever to move the control rod to supercharge the engine.

2. A centrifugal governor according to claim 1 in which said stop element comprises a bolt threadedly engaged in the oscillating lever and engaging said auxiliary lever such that the axial position of the bolt relative to the oscillating lever and the fulcrum is adjustable.