DE1031053B - Low voltage sliding spark plug - Google Patents

Description

Low Voltage Sliding Spark Spark Plug The invention relates to a low-voltage sliding spark plug in the lower part of the spark plug body an insulating layer resistant to high temperatures is pressed in and also the Out of the plug body protruding insulator made of a heat-resistant pressed material consists, in which there is also an exchangeable electrode insert from the ignition-side end the plug is inserted into the spark plug body.

Low - voltage spark sunk gliding this basic type are known. In a known embodiment, the insert is screwed into the spark plug body. This type of fastening of the insert in the plug body has considerable disadvantages, which consist in the fact that the insert becomes loose over time due to the great stresses that occur in the combustion chamber of the internal combustion engine and, under certain circumstances, even falls into the combustion chamber. Hence, at spark plugs. Of this type, extensive safety devices are still required to prevent the insert from falling out or unscrewing.

There are also known low-voltage sliding spark plugs in which the replaceable insert is inserted into the spark plug body from above and rests on a ring heel. The insert is held in place by means of a screw ring.

Although with this type of design a low-voltage sliding spark spark plug there is no risk of the insert falling out or loosening towards him, however, a different one. significant disadvantage.

It is known that a spark plug is composed of several parts is required that it is absolutely gas-tight, otherwise the processes in the combustion chamber can be adversely affected, with spark plugs of the type described above gas tightness to the extent required for internal combustion engines is not to be achieved.

The invention provides a low-voltage sliding spark spark plug of basic design described above, which apart from its simplicity in construction and cheapness to manufacture that in view of practicality required E, requirement of easy interchangeability of the electrode insert without special equipment or specialist knowledge with ensuring gas tightness in particular Measures met.

The spark plug according to the invention is characterized screwed by one in the insulator and in the insulating layer of the spark plug body metal can used as well as a guided in the metal can pin on whose zündseitigem end of the electrode insert, which is screwed with the interposition of seals by on the f reien end of the bolt , on the metal bushing its abutment finding nuts is pressed against the insulating layer and the metal bushing.

The inventive design of a low-voltage sliding spark spark plug with exchangeable insert gives the advantage of absolute gas tightness and avoids the risk of the electrode insert falling out. The simple, reliable one The formation of the candle enables the replacement even by non-specialists can be made.

Further details and features of the invention can be found in the drawing in which an exemplary embodiment is shown.

The spark plug body 1 has the usual shape and is provided with a screw thread 2 at the lower end and a hexagon 3 at the upper end. An insulating material 4 which is resistant to high temperatures is pressed into the lower part of the spark plug body 1. The insulator 5 protruding from the plug body consists of a pressed material which is also sufficiently heat-resistant.

In the insulator 5 and in the insulating layer 4 there is a metal sleeve 6 through which the central bolt 7 is inserted. At the lower end of the bolt 7 , the electrode insert 8 is z. B. fastened by means of screw thread. The insert 8, which contains kiroden EIE the effective parts of and two by- rili, Eid-grained electrodes and eifiehi ZWL-ächd-n "IHD @ fi be - loan separating body which is därgestellt only schernatisEh order is the Mittelbolzen7 around. On the insert 8 there is a very thin capped sealing ring, 9 aiigeafdiiet, which is also surrounded by a thin asbestos finger 10 that extends over the insert 8 to the candle body 1 .

When assembling the spark plug, the central bolt 1 with the electrode insert 8 attached to it is inserted into the sleeve 6 from the underside. Then a copper sealing ring 11 is pushed against the upper edge of the sleeve 6 over the upper end of the central bolt. By means of two on the f ree E, the center pin walls screwed nuts 12, 13 will eventually the interchangeable electrode insert ini lZündkerzenkörper bkJestigt. The two sealing rings 9 and 11 are pressed firmly against their seat surfaces.

The construction parts used are easy to manufacture. To change the electrode insert only the nuts 12, 13 need to be unscrewed, whereupon the central bolt 7 with the electrode insert can be easily removed.

Claims (1)

PATENT CLAIM: Low-voltage sliding spark spark plug in which an insulating layer resistant to high temperatures is pressed into the lower part of the spark plug body and the insulator protruding from the plug body is made of a heat-resistant pressed material, in which an exchangeable electrode insert is inserted from the ignition-side end of the plug Spark plug body is inserted, characterized by a metal sleeve (6) inserted into the insulator (5) and into the insulating layer (4) of the spark plug body (1 ) as well as by a bolt (7) guided in the metal sleeve, on the ignition side of which the electrode insert (8 ) is screwed on, which, with the interposition of seals (9, 10), is pressed against the insulating layer and the metal bushing by nuts (12, 13) screwed onto the free end of the bolt and located on the metal bushing. Documents considered: German Patent Nos. 857 705, 570 508 French Patent No. 569 078; U.S. Patent Nt. 2,135,297.