# US 4,393,835 A · RPM Governor for a fuel injection pump

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- Number: US 4,393,835 A
- Document ID: US4393835A
- Status: Granted
- Kind: A
- Application number: 06/334,715
- Filed: 1981-12-28
- Granted: 1983-07-19
- Earliest claimed: 1978-10-17
- Assignees: Robert Bosch GmbH
- Inventors: Franz Eheim; Gerald Hofer
- Web page: https://patentgrep.com/patent/US4393835A

## CPC

- F02D 1/08: Transmission of control impulse to pump control, e.g. with power drive or power assistance
- F02M 41/126: {valves being mechanically or electrically adjustable sleeves slidably mounted on rotary piston}
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

An rpm governor is proposed, in which intervention into the regulation process can be made directly via a magnet, so that the degree of proportionality, particularly with isostatic governors, can be lowered to a minimum.

## Claims

### Claim 1

In an rpm governor for a fuel injection pump of an internal combustion engine which includes
a quantity adjustment means for determining the quantity of fuel injected, said quantity adjustment means being movable along a predetermined path between a first position at which a maximum quantity of fuel is injected and a second position at which a minimum quantity of fuel is injected,
a first shaft,
a governor lever means for positioning said quantity adjustment means, said governor lever means being pivotable about said first shaft and coupled to said quantity adjustment means,
an rpm adjuster means for exerting a force on said governor lever means proportional to the rpm of the internal combustion engine,
restoring force means for exerting a force on said governor lever means counter to the force exerted on said governor lever means by said rpm adjuster means,
a second shaft having opposite ends defining an axis therebetween, said second shaft being pivotably mounted for rotation about its axis;
a first pin, disposed eccentrically on said second shaft;
an adjustment lever means, connected to said second shaft for arbitrary pivotal movement of said second shaft; and
a governor spring, connected at one end to said first pin and at an opposite end to said governor lever means; and a rotary electromagnet having an armature which is engaged with said second shaft to vary the setting of said rpm governor.

### Claim 2 (depends on 1)

An improved rpm governor, as described in claim 1, wherein said adjustment lever means is connected to said second shaft by an elastic coupling.

### Claim 3 (depends on 2)

An improved rpm governor, as described in claim 2, wherein said adjustment lever means comprises:
a third shaft, coaxially disposed adjacent said second shaft, and pivotably mounted for rotation about the common axis of said second and third shafts, said third shaft including an adjustment lever affixed thereon;
a spiral spring, having an inner end affixed to one end of the two adjacent ends of said second and third shafts, and having an outer end;
a cup shaped housing for said spiral spring, which is coaxially connected to the other end of the two adjacent ends of said second and third shafts, the outer end of said spiral spring being connected to said cup shaped spring housing.

### Claim 4 (depends on 1)

An improved rpm governor, as described in claim 1, which further comprises a transducer means for measuring the rotary position of said second shaft.