Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1986-12-02
1989-05-16
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
239288, 239600, F02M 6114
Patent
active
048299650
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an injection valve according to the construction of the introductory part of the main claim.
In the case of this known construction, the O-ring arranged on the nozzle of the injection valve is pressed radially during the insertion into the receiving bore in the suction pipe wall. On the insertion side, the receiving bore has a bevel by means of which the pressing of the O-ring is introduced during the insertion into the receiving bore. For structural reasons, this bevel, in the area around the receiving bore, as a rule is relatively low in inserting direction and is formed at a relatively large cone angle. At the transition from the receiving bore to the bevel, this results in a relatively sharp edge which, when the nozzle part of the injection nozzle is connected eccentrically with respect to the receiving bore, may result in damage to the O-ring.
In the case of the simultaneous mounting of several injection valves at the single suction pipes of a suction system for in-line cylinders of an internal-combustion engine, this danger is particularly great when the injection valves, on the fuel supply side, are arranged at a joint fuel distributor pipe (DE-OS No. 29 26 490). In this case, for the tuning-out of noise between the injection valves and the fuel distributor pipe, a respective insertion arrangement is provided with an inserted sealing ring, similar to the above-described insertion arrangement on the side of the suction pipe. By means of this insertion arrangement, each injection valve to a certain degree can be removed relative to the fuel distributor pipe so that during the simultaneous mounting of the injection valves, eccentric positions of some injection valves with respect to their receiving bores must be expected.
The invention is based on the objective of indicating a development of an injection valve of the initially mentioned construction by means of which, when the injection valve is inserted into the receiving bore of the suction pipe, damage to the sealing ring is avoided.
This objective is achieved by the characterizing part of the main claim containing a centering device arranged in the free end area of the nozzle. Advantageous developments of the invention are described in claims 2 and 3. In the case of both developments, the invention is in each case carried out on the basis of a protective cap for the nozzle piece of the injection valve known in the state of the art. The inventive development of the protective caps that are preferably made of plastic consists of the elastically flexible outside contour provided by additional arrangements. As a result, the automatic centering of the injection nozzle is advantageously supported. In addition, this outside contour provided by means of elastically flexible tongues or flexible lips at webs, with its dimensions with respect to the receiving bores, combines an automatic advancing of the nozzle piece of the injection valve into the receiving bore with the avoidance of damage to the sealing ring at the processing edges.
Embodiments of the invention are shown in the drawing.
FIG. 1 is a partially shown injection valve having a protective cap that has an approximately semispherical elastic outside contour formed by flexible tongues;
FIG. 2 is a partially shown injection valve having a protective cap that has webs distributed at the outer circumference that, in each case, in the area of the large outer diameter taper off into lips that are elastically flexible in circumferential direction.
An injection valve 1 for a mixture-compressing internal-combustion engine that is not shown carries an O-ring on a nozzle piece 2. The O-ring 3 is arranged on the nozzle piece 2 between a shoulder 4 of the injection valve 1 and a protective cap 5 in the free end area of the nozzle piece 2. For the holding of the injection valve 1 in a suction pipe 6, the injection valve 1, with its nozzle piece 2, is inserted into a wall breakthrough 7 of the suction pipe 6, the holding of the injection valve 1 being achieved essentially by the compress
REFERENCES:
patent: 4589596 (1986-05-01), Stumpp et al.
patent: 4647012 (1987-03-01), Gartner
Gartner Jurij
Kaindl Wolfgang
Argenbright Tony M.
Bayerische Motoren Werke A.G.
Carlberg Eric R.
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