Internal-combustion engines – Two-cycle – Pump and cylinder adjacent
Patent
1998-07-16
2000-01-11
Moulis, Thomas N.
Internal-combustion engines
Two-cycle
Pump and cylinder adjacent
123531, 123456, F02M 3704
Patent
active
060124180
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a distributor device for fuel injection systems of internal combustion engines for supplying gas and electrically contacting at least two of the fuel injection valves according to the definition of the species of the main claim that serve to inject a mixture of fuel and gas.
Unexamined German Patent DE-OS 44 31 044 has already disclosed a distributor device for fuel injection systems, where several bushings to accommodate plugs arranged on the fuel injection valves are molded onto a gas supply line to the common gas supply of the fuel injection valves. The gas supply line has connecting parts with a branch opening that opens into the supply opening of the gas supply line. Gas inlet channels of the fuel injection valves can be inserted into the branch openings. A bushing strip on which are arranged the bushings for electrically contacting the fuel injection valves runs parallel to the gas supply line. However, in dismantling the known distributor device for maintenance purposes, it has the disadvantage that no easily handled means for releasing the connection between the bushings and the plugs of the injection valves are provided. In comparison with a conventional bushing-plug connection, releasing the connection between the bushings and plugs is subject to special problems inasmuch as the connection between the gas inlet channels of the fuel injection valves and the connecting parts of the gas supply line must also be separated at the same time. Furthermore, no means are provided for compensation of the manufacturing tolerance in the distance between the plugs and the gas inlet channels of the fuel injection valves on the one hand and the bushings and connecting parts of the distributor device on the other hand, although this distance varies only to a very slight extent. This further interferes with handling in both assembly and dismantling.
European Patent 0 530 337 has disclosed a fuel distributor for supplying fuel to the fuel injection valves. The electric supply lines for electrically contacting the fuel injection valves are arranged inside a contact strip which can be placed on the fuel distributor by a snap connection. However, the bushings to be placed on the plugs of the fuel injection valves are not integrated into the fuel distributor but instead are connected to the supply lines running in the contact strip by an external cable. Therefore, connecting the plugs to the bushings does not take place simultaneously with the fuel injection valves being connected to the fuel supply line, but instead it requires an additional assembly step.
ADVANTAGES OF THE INVENTION
The distributor device according to this invention with the characterizing features of the main claim, however, has the advantage that it guarantees simple, inexpensive and easily handled gas supply with integrated electrical contacting of fuel injection valves for injection of a fuel-gas mixture. The distributor device is a very compact component which can be assembled and dismantled very easily. In dismantling the distributor device, the locking connection of the bushing with the plug of the respective fuel injection valves is released by loosening a locking spring. An operating device for loosening the locking spring is arranged on the side of the gas supply line facing away from the bushings. This has the advantage that accessibility of the operating device is not hindered by the fuel injection valve. The arrangement of the operating device directly on the gas supply line has the additional advantage that the operating device is in the immediate vicinity of the connection of the gas inlet channel of the fuel injection valve to the respective connecting part of the gas supply line which must be released at the same time in dismantling the distributor device. In this way the connection between the bushing and the plug and that between the gas inlet channels and the distributor device can be released at the same time with a simple measure, which greatly simplifies handling.
Advantageous refinements and improve
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Bodenhausen Eckhard
Gregorius Thomas
Moulis Thomas N.
Robert & Bosch GmbH
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