Internal-combustion engines – Starting device – Auxiliary fuel supply device
Patent
1990-11-28
1992-03-17
Dolinar, Andrew M.
Internal-combustion engines
Starting device
Auxiliary fuel supply device
290 38R, F02N 1108
Patent
active
050958640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a starting device for internal combustion engines, in particular of large combustion engines having two starters operating in parallel mode each of which has a starting pinion which can be driven by an electrical drive motor, a starting relay which engages in a gear wheel of the internal combustion engine when the starting pinion is excited, and a switch which closes at the end of the engagement process. A starter switch connects the starting relay to a power supply and has switching means for connecting the drive motors to the power supply only after engagement of both starting pinions has occurred.
In a known starting device with double starter of this kind, the switching means for supplying the two drive motors with power, after the starting pinions of both starters have been engaged in the gear ring of the internal combustion engine, includes a double starting relay the two switching contacts of which produce a direct electrical connection of the drive motors to the electrical system of the vehicle. The switches actuated by the two starting pinions or starting relay at the end of the engagement process each have a switching contact. With the closing of the starter switch, the starting relay of the one starter is connected to the vehicle electrical system. If its drive pinion is engaged, the switching contact of the associated switch closes and ensures a DC current flow in the starting relay of the other starter. The starting relay engages the starting pinion likewise into the gear ring of the internal combustion engine. If this starting pinion is also engaged, the two excitation windings of the double starting relay connected in parallel are supplied with DC current via the switching contact of the associated switch which is now also closed, so that the two relay contacts of said double starting relay close. Via the relay contacts, each drive motor of the two starters is now connected to the vehicle electrical system.
SUMMARY OF THE INVENTION
The object of the invention is a starting device in which the double starting relay and corresponding line connections can be dispense with. The object of the invention is achieved by providing a starting device in which the relay windings of the starting relays are parallel to one another and are connected in such a way that they are excited simultaneously when the starter switch is actuated. The switching means is formed by switching contacts of the switches, of which in each case switching contacts associated with two different starters are series-connected and connected in series to, in each case, one drive motor. In addition, there is a shorter switching time in the event of mimic connections, since the actuation of both starters occurs at the same time and not successively.
In a further embodiment of the invention, the hitherto conventional switches with a single switching contact are replaced by, in each case, one switch with a double contact, while in the still another embodiment of the invention the single switching contacts of the two switches associated in each case with one starter must be designed for twice the current load, since the current for both drive motors connected in parallel is directed via the two switching contacts arranged in series.
The present invention both as to its construction so to its mode of operation, together with additional objects and advantages thereof, will be best understood from the following detailed description of preferred embodiments when read with reference to the appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 and 2 show, respectively, first and second embodiments of a circuit diagram of a starting device having two starters, operated in parallel, for an internal combustion engine according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The starting device, illustrated in the circuit diagram in FIG. 1, for an internal combustion engine of a motor vehicle has two starters 11,12 operating in parallel mode. The motor vehicle batter
REFERENCES:
patent: 1279907 (1918-09-01), Reinhold
patent: 2115671 (1938-04-01), Pfister
patent: 2930901 (1960-03-01), Freeman
Bolenz Klaus
Wuerth Hans
Dolinar Andrew M.
Robert & Bosch GmbH
Striker Michael J.
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