Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1994-02-03
1995-08-15
Kamen, Noah
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
F02B 7700
Patent
active
054410258
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an electromagnetic device for starting and stopping a diesel engine, comprising a solenoid with means for mounting the same relative to the engine injection pump housing and an armature cooperating with a starting/stopping means having a lever element carried on a shaft rotatably mounted in said housing.
BACKGROUND OF THE INVENTION
A electromagnetic device of this type is used in diesel engines to either cut off or start the supply of fuel from the engine injection pump in order to kill or start the engine. In one case the supply of fuel is open when the circuit is completed thereby activating the solenoid and in the second case the supply of fuel is cut off when the circuit is completed. Different applications will in this case require different design arrangements.
A known device for starting and stopping uses a pulling solenoid with an armature, which via a ball joint and an extendible linkage arm acts on a lever which is fixed to a shaft rotatable in the fuel pump housing, and this will affect the fuel supply regulating element in the regulator. The linkage arm is joined to the lever via a pivot pin extending into an opening in the lever. The solenoid has two coils, one for pulling and one for holding. Devices of this type are susceptible to reliability problems due to sluggighness in the mechanical linkage system in combination with weak magnets and this can result in burned windings.
SUMMARY OF THE INVENTION
The purpose of the present invention is to provide an electromagnetic starting and stopping device of the type described by way of introduction, which is small and compact, has high reliability and can be mounted directly on a fuel pump housing.
This is achieved according to the invention by virtue of the fact that the lever element has a cam surface and is spring biased to press the cam surface against a surface on the armature or an element joined to the armature and that the solenoid is disposed when actuated to provide a force acting between the armature and the lever element to pivot the lever element.
The arrangement with interacting cam elements which are pressed into contact by the springs, eliminates the need for linkages, the links of which must be carefully adapted to the installation in question. The present invention does not require precision in installation and makes possible low resistance to operating movement.
In a preferred embodiment of the invention the armature exerts a pulling force when actuated and is spring biased towards the lever element with the spring force which is greater than the force with which the spring force biasing the lever element loads the armature in the opposite direction. For example, the spring force on the armature acting opposite to its actuation direction can be about twice the force provided via the spring biased lever in the opposite direction, and this means that the magnet must in principle be dimensioned to provide slightly more than half of the spring force acting against the lever element.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to an example shown in the accompanying drawings, where FIG. 1 shows a perspective view of a portion of a fuel pump housing with a start/stop device in a first mounting configuration and FIG. 2 shows a view corresponding to FIG. 1 with the start/stop device in an alternative mounting configuration.
DETAILED DESCRIPTION OF THE INVENTION
In the Figures, 1 designates a portion of the injection pump housing of a diesel engine. The injection pump is of a type known per se and since the design is not crucial to the present invention it will not be described in more detail here. Suffice to say the injection pump has a shaft 2 pivotably mounted in the housing and the shaft acts on means (not shown) arranged in the housing which increase or decrease the flow of fuel from the pump to the engine cylinders depending on the setting of the shaft 2. A double lever 3 is fixed to the shaft and has two arm
REFERENCES:
patent: 4388900 (1983-06-01), Hoshi
patent: 4424782 (1984-01-01), Emmerich
patent: 4594980 (1986-06-01), Detweiler
patent: 4757791 (1988-07-01), Hachitani et al.
patent: 4922873 (1990-05-01), Gaeti
patent: 4924827 (1990-05-01), Minegishi
patent: 5131361 (1992-07-01), Hartman et al.
AB Volvo Penta
Kamen Noah
LandOfFree
Device for starting and stopping a diesel engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for starting and stopping a diesel engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for starting and stopping a diesel engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2175360