# US 2018/0323582 A1 · Spark plug having an increased tightening torque

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- Number: US 2018/0323582 A1
- Document ID: US20180323582A1
- Status: Published application
- Kind: A1
- Application number: 15/771,881
- Filed: 2016-10-20
- Published: 2018-11-08
- Earliest claimed: 2015-11-02
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Ba Thien Chuong Vo; Chris Schimmel
- Web page: https://patentgrep.com/patent/US20180323582A1

## CPC

- H01T 13/08: Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
- H01T 13/20: characterised by features of the electrodes or insulation
- H01T: SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (overvoltage protection circuits H02H)

## Abstract

A spark plug, including an insulator, a casing including a sealing surface, and a gasket which rests against the sealing surface, the sealing surface including a plurality of recesses.

## Claims

### Claim at position 1

1-11. (canceled)

### Claim 12

A spark plug, comprising:
an insulator;
a casing including a sealing surface; and
a gasket which rests against the sealing surface;
wherein the sealing surface includes a plurality of recesses.

### Claim 13 (depends on 12)

The spark plug of claim 12, wherein the recesses are open toward an outer periphery of the casing.

### Claim 14 (depends on 12)

The spark plug of claim 12, wherein the sealing surface is provided on the casing at a peripheral projection of the casing.

### Claim 15 (depends on 12)

The spark plug of claim 12, wherein the sealing surface is situated at a shell area of the casing provided perpendicularly to the axial direction of the spark plug.

### Claim 16 (depends on 12)

The spark plug of claim 12, wherein the recesses are situated at uniform distances in the peripheral direction.

### Claim 17 (depends on 12)

The spark plug of claim 12, wherein a thickness of the gasket in the axial direction of the spark plug is greater than a depth of the recesses in the axial direction of the spark plug.

### Claim 18 (depends on 12)

The spark plug of claim 12, wherein an outer periphery of the sealing surface corresponds to the greatest diameter of the casing.

### Claim 19 (depends on 12)

The spark plug of claim 12, wherein an abrupt transition is provided between the recesses and the sealing surface.

### Claim 20 (depends on 12)

The spark plug of claim 12, wherein the number of the recesses is an even number.

### Claim 21 (depends on 12)

The spark plug of claim 12, wherein a male thread is provided on the casing as a metric thread M10 or M8.

### Claim 22 (depends on 12)

The spark plug of claim 12, wherein the number of the recesses is an even number, in a range from 4 to 10 recesses.

### Claim 23

An internal combustion engine, comprising:
a spark plug, including:
an insulator;
a casing including a sealing surface; and
a gasket which rests against the sealing surface;
wherein the sealing surface includes a plurality of recesses; and
a metric M8 thread connection or a metric M10 thread connection between the spark plug and the cylinder head.