Abstract: The invention relates to a fuel injector (10), in particular a common-rail injector, comprising a valve housing (11) which can be inserted into a first receiving bore section (107) of an internal combustion machine and which has a first valve housing section (12) that faces a combustion chamber (101) of an internal combustion engine in the assembled position, said valve housing section being in contact with the combustion chamber (101) at least in some regions. At least the first valve housing section (12) consists of metal, and the first valve housing section (12) is radially surrounded by a protective element (20) in the form of a protective sleeve (21). The protective sleeve (21) extends at least over a part of the axial length of the first valve housing section (12). According to the invention, the transition region between the protective sleeve (21) and the first valve housing section (12) is sealed on the protective sleeve (21) side paired with the combustion chamber (101).

Abstract: The invention relates to a fuel injector (10), particularly a common rail fuel injector, with a valve housing (11) that can be inserted into a receiving opening (106) of a cylinder head (100) in an internal combustion engine and, when in the installed position, has a first valve housing section (12) facing a combustion chamber (101) in the internal combustion engine. The first valve housing section (12) is made of metal and is radially surrounded on the side facing the combustion chamber (101) by a sealing element (20) that can be inserted into the annular space between the first valve housing section (12) and the receiving opening (106) in the region of a first receiving bore section (107).

Abstract: A tool head for use in machine tools, has a main body which can be rotated around an axis of rotation. The tool head has a slide. The slide can be moved by means of a pull rod axially oriented in the main body. The slide can be fitted with at least one tool or one tool holder. At least one adjustable toothed plate is fixedly arranged on the slide. The toothed plate has a helical gearing functioning as a gear means for engaging with a helical gearing of the pull rod which is complementary thereto. The slide has an adjustment unit for moving the at least one toothed plate and the helical gearing thereof into the complementary helical gearing of the pull rod.

Abstract: The invention relates to a fuel injector (10), particularly a common rail fuel injector, with a valve housing (11) that can be inserted into a receiving opening (106) of a cylinder head (100) in an internal combustion engine and, when in the installed position, has a first valve housing section (12) facing a combustion chamber (101) in the internal combustion engine. The first valve housing section (12) is made of metal and is radially surrounded on the side facing the combustion chamber (101) by a sealing element (20) that can be inserted into the annular space between the first valve housing section (12) and the receiving opening (106) in the region of a first receiving bore section (107).

Abstract: The invention relates to a tool head for use in machine tools, comprising a main body which can be rotated around an axis of rotation. The tool head has a slide. The slide can be moved by means of a pull rod axially oriented in the main body. The slide can be fitted with at least one tool or one tool holder. At least one adjustable toothed plate is fixedly arranged on the slide. The toothed plate comprises a helical gearing functioning as a gear means for engaging with a helical gearing of the pull rod which is complementary thereto. According to the invention, the slide has an adjustment unit for moving the at least one toothed plate and the helical gearing thereof into the complementary helical gearing of the pull rod.