Device for injecting medium, and exhaust gas after-treatment installation

An exhaust gas post-treatment and medium technology, which is applied in fuel injection devices, special fuel injection devices, exhaust gas treatment, etc., can solve the problems of increased loss, adhesion and abrasion, piston radial load, etc., and achieves low loss and small Force consumption, avoiding the effect of lateral forces

Inactive Publication Date: 2017-02-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, during the pressure build-up there may be forces which cause the piston to be radially loaded and therefore also radially acting, resulting in increased losses, especially adhesion and abrasion

Method used

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  • Device for injecting medium, and exhaust gas after-treatment installation

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Embodiment Construction

[0016] The drawing shows in a simplified longitudinal section a device 1 which is configured as a pump-nozzle system and is part of an exhaust gas aftertreatment device for exhaust gas aftertreatment of a motor vehicle internal combustion engine. The device 1 has a housing 2 which is currently constructed in multiple parts. Here, the housing 2 has a first housing part 3 placed outside and a second housing part 4 built in. The housing part 4 has a piston receiving portion 5, and the piston 6 is slidably supported in the piston receiving portion 5 in an axially movable manner. The piston receptacle 5 here has an inner diameter substantially corresponding to the outer diameter of the piston 6 so that an advantageous sliding support for the piston 6 is produced. The piston receiving portion 5 is configured as a pocket drilled hole or a pocket recessed portion, so that the piston receiving portion 5 has a contracted diameter at one end. This reduced diameter here forms an injectio...

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Abstract

The invention relates to a device (1), particularly a pump-nozzle system, for injecting a medium, particularly a liquid exhaust gas after-treatment agent, comprising a housing (2) in which a piston (6) is mounted so as to be axially displaceable, as well as an electromagnetic actuator (13) for displacing said piston (6) against a spring force, said actuator (13) comprising a magnet armature (15) that is associated with the piston (6) in order to displace, and be displaceable with, said piston. According to the invention, the magnet armature (15) only lies axially against the piston, and is held radially on said housing (2) in a guided manner.

Description

Technical field [0001] The present invention relates to a device, in particular a pump-nozzle system, for spraying a medium, especially a liquid exhaust gas aftertreatment agent. The device has a housing and an electromagnetic actuator, and a piston is axially movably arranged on the housing. In the body, the electromagnetic actuator is used to move the piston against the force of a spring, and the actuator has an armature that is allocated to the piston to move the piston and can move together. [0002] The present invention also relates to an exhaust gas aftertreatment device for a motor vehicle, which has a corresponding device for injecting an exhaust gas aftertreatment agent into the exhaust gas flow of an internal combustion engine of the motor vehicle. Background technique [0003] Devices and exhaust gas aftertreatment devices of the type mentioned at the beginning are known from the prior art. For motor vehicles with internal combustion engines, such as internal combustio...

Claims

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Application Information

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IPC IPC(8): F01N3/20F04B17/04
CPCF01N3/2066F01N2610/1433F01N2610/1453F04B17/04F02M57/027F02M51/061F02M2200/9007F02M2200/9069
Inventor R·黑贝尔T·斯托贝尔
Owner ROBERT BOSCH GMBH
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