Cranking device for internal combustion engines

Details Cranking device for internal combustion engines Cranking device for internal combustion engines

1990-12-28

1992-11-03

Dolinar, Andrew M.

Internal-combustion engines

Starting device

Auxiliary fuel supply device

290 38R, F02N 1108

Patent

active

051599082

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention relates to a cranking device for internal combustion engines and comprising a permanently excited cranking motor and a run-down brake.
Cranking devices of this kind are known. They have the disadvantage, particularly in the case of a rapid starting succession, that although the starter pinion disengages in good time from the associated gear of the internal combustion engine, it does not come to a stop rapidly enough, with the result that the subsequent meshing procedure cannot proceed correctly, and the starter pinion does not mesh correctly in the associated gear of the internal combustion engine. This results in a high mechanical loading of the gears and severe noise generation. Starters are known in which, on completion of the starting procedure, the meshing mechanism or the armature is pressed against a buffer disc or brake disc by a return spring, resulting in a frictional force which shortens the run-down phase of the cranking motors. A disadvantage of this run-down brake is its wear. In addition, abrasion residues can impair the functions of the cranking device. Furthermore, a constant friction or braking torque cannot be achieved due to dirt and any moisture which may penetrate.


SUMMARY OF THE INVENTION

The object of the invention is a cranking device in which even in the case of a rapid starting succession, an optimum meshing operation is guaranteed, with the result that mechanical loads and noises, whatever disturbances of electrical and/or electronic loads connected to the vehicle electrical system, are reduced to a minimum. The object of the invention is achieved by providing an electric run-down brake with a switching device which brakes the cranking motor after the starting procedure, by connecting the connecting leads of the brushes of the cranking motor to one another via an impedance element. It is particularly advantageous here that braking occurs without mechanical intervention in the cranking motor. The run-down brake is therefore very hard-wearing and maintenance-free. Furthermore, a uniform friction or braking torque is guaranteed.
In a preferred embodiment, the brushes of the cranking device are connected to one another via a brake winding which is provided as an additional winding to the excitation winding of an engaging relay. The run-down brake is therefore particularly simple and economical in construction because no additional components are required.
In a further preferred illustrative embodiment, the brake winding is of bifilar design so that no forces act on the armature of the engaging relay in the run-down phase of the cranking motor.
In a further embodiment, the brushes of the motor of the cranking device are connected to one another via a wire jumper. Due to the low resistance of this connection, the cranking motor comes to a stop particular quick. Admittedly, very high currents also flow in this case.
Furthermore, preferred is an embodiment of the cranking device in which the switching device has a changeover contact which is actuable by the engaging relay of the cranking device and, during the run-down phase of the cranking motor, connects the feed lines of the brushes to one another via an impedance element. In this way, a particularly simple construction of the switching device is guaranteed.
In a further preferred illustrative embodiment, the contact bridge of an engaging relay of a cranking device is used as changeover contact, which, in a first position, during the starting phase, connects the cranking motor to a voltage supply and, in a second position, during the run-down phase of the cranking motor, connects the brushes of the latter to a resistor. The advantage of this construction is that existing contacts are used for the switching device, as a result of which the construction is very simple.
In a further preferred illustrative embodiment of the cranking device, contacts which are arranged in the magnetic core of the engaging relay are connected to one another electrically via the contact bridge in the rundown phase of the cranking

REFERENCES:
patent: 2353900 (1944-07-01), Janes
patent: 2429388 (1947-10-01), Buxton
Patent Abstracts of Japan, vol. 10, No. 295 (M-523)(2351) Oct. 7, 1986 & JP-A-61-108870.
Patent Abstracts of Japan, vol. 11, No. 397 (M-655)(2844) Dec. 25, 1987 & JP-A-62-162772.

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