Prechamber system

Abstract

A prechamber system for an internal combustion engine has a prechamber, a fuel introduction device, a dead space which connects the fuel introduction device to the prechamber. A channel is provided which connects the prechamber to the dead space.

Claims

1. A prechamber system for an internal combustion engine, comprising: a prechamber; a fuel introduction device; a dead space connecting said fuel introduction device with said prechamber; and a channel directly connecting said prechamber with said dead space.

2. The prechamber system of claim 1, further comprising a fixing segment formed as a thread to fix a spark plug to said prechamber, said channel being configured to open into said prechamber in a region of said fixing segment.

3. The prechamber system of claim 1, wherein said prechamber has an overflow channel, said channel being configured to directly connect said overflow channel of said prechamber to said dead space.

4. An internal combustion engine comprising: a main combustion chamber; and a prechamber system including: a prechamber; a fuel introduction device; a dead space connecting said fuel introduction device with said prechamber; and a channel directly connecting said prechamber with said dead space.

5. The internal combustion engine of claim 4, wherein said prechamber system further includes a fixing segment formed as a thread to fix a spark plug to said prechamber, said channel being configured to open into said prechamber in a region of said fixing segment.

6. The internal combustion engine of claim 4, wherein said prechamber has an overflow channel, said channel being configured to directly connect said overflow channel of said prechamber to said dead space.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIGS. 1a, 1b and 2 show diagrammatically a section of an internal combustion engine in the region of a cylinder head.

DETAILED DESCRIPTION OF THE INVENTION

(2) On FIG. 1b (variant according to the invention):

(3) Here, the channel 3 opens into the prechamber 10 in the region of a fixing segment, which in this case is a thread (extending over region a) of the spark plug 12. This variant is more favorable for production than that the configurations of FIG. 1a or FIG. 2.

(4) On FIG. 2 (variant according to the invention):

(5) The channel 3 connects the dead space 2 (corresponding to the description above) with the overflow channel 4 of the prechamber 10. As can be seen from FIG. 2, the channel 3 forms a direct connection between the dead space 2 and the overflow channel 4 of the prechamber 10, meaning that only the channel 3 is located between the dead space 2 and the overflow channel 4 of the prechamber 10. On the compression stroke, high flow speeds occur in the overflow channel 4. Corresponding to the Venturi effect therefore, in the overflow channel 4 a reduced pressure occurs in comparison with the dead space 2. Thus, a rich mixture is extracted from the dead space 2 and mixed into the lean mixture flowing from the main combustion chamber 5 into the prechamber 10. This mixing has a positive effect on the mixing homogeneity in the prechamber 10. At the same time, lean mixture is drawn out of the prechamber 10 into the dead space 2, so that there at the time of ignition largely lean mixture is achieved which is above the soot formation limit. 1 Fuel introduction device, for example gas valve 2 Dead space 3 Channel for dead space flushing 4 Overflow channel 5 Main combustion chamber 6 Piston 7 Cylinder lining 8 Prechamber wall 9 Cylinder head 10 Prechamber 11 Spark plug sleeve 12 Spark plug