Fuel injector

Patent metadata

Field	Value
Publication number	US-9822749-B2
Application number	US-201214365989-A
Country	US
Kind code	B2
Filing date	Oct 23, 2012
Priority date	Dec 20, 2011
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A fuel injector for an internal combustion engine includes: an electromagnetic actuating element having a solenoid coil, a core and a valve casing as the outer solenoid circuit component, and a movable valve-closure body, which cooperates with a valve-seat surface assigned to a valve-seat body. The core and a connection pipe are fixedly connected in an inner opening of a thin-walled valve sleeve and the valve casing at the outer circumference of the valve sleeve is fixedly connected to the valve sleeve by being pressed in/on.

First claim

What is claimed is:

1. A fuel injector for a fuel injection system of an internal combustion engine, the fuel injector having a longitudinal valve axis, comprising: a valve-closure body; a valve-seat surface provided on a valve-seat body, wherein the valve-closure body cooperates with the valve-seat surface; an excitable actuator for operating the valve-closure body; at least one spray-discharge orifice; and at least two metallic components which are fixedly connected to one another by press-fitting, wherein for the press-fitting of the at least two metallic components, both of the metallic components have completely metallic press-fitting regions, wherein at least one of the press-fitting regions has at least two successive zones disposed on a same side of one of the metallic components, wherein: the successive zones are successive with respect to one another along a direction that is parallel to the longitudinal valve axis, each zone has a structure including grooves, a profile depth of the grooves of a first zone differs from a profile depth of the grooves of a second zone, and the grooves of the first zone and the grooves of the second zone are disposed on the same side of the one of the metallic components.

2. The fuel injector as recited in claim 1 , wherein the grooves extend all the way around the press-fitting region.

3. The fuel injector as recited in claim 1 , wherein the at least one of press-fitting regions includes the following successively contiguous portions: an insertion bevel; a cylindrical press-fitting section; and a welding region.

4. The fuel injector as recited in claim 3 , wherein one of: (i) the welding region extends inclined at an angle relative to the press-fitting section; or (ii) the welding region is set back via a shoulder with respect to the press-fitting section.

5. The fuel injector as recited in claim 3 , wherein the grooves in the welding region have the smallest profile depth among the grooves of the press-fitting region.

6. The fuel injector as recited in claim 5 , wherein the profile depth of the grooves in the press-fitting section is greater than the profile depth of the grooves in the welding region.

7. The fuel injector as recited in claim 6 , wherein the press-fitting section is subdivided into two subzones, the profile depth of the grooves in the first subzone in the direction towards the insertion bevel being greater than the profile depth of the grooves in the second subzone in the direction towards the welding region.

8. The fuel injector as recited in claim 6 , wherein the grooves in the insertion bevel have the largest profile depth among the grooves of the press-fitting region.

9. The fuel injector as recited in claim 8 , wherein the at least two metallic components are fixedly connected to each other in the welding region by a continuous material.

10. The fuel injector as recited in claim 8 , wherein a transition from a coarse profiling to a finer profiling of the profile depth of the grooves in the press-fitting region is carried out tangentially.

11. The fuel injector as recited in claim 8 , wherein:
the at least two metallic components include a thin-walled valve sleeve and at least one of a valve casing, a connection pipe and a core; and
at least one of (i) the valve casing is pressed into place on the thin-walled valve sleeve, and (ii) at least one of the connection pipe and the core is pressed in place into the thin-walled valve sleeve.

Assignees

• Derenthal Marc-Jean
• Bayer Johann
• Ittlinger Ralph
• Bosch Gmbh Robert

Inventors

• Derenthal Marc-Jean
• Bayer Johann
• Ittlinger Ralph

Classifications

• F02M51/0682 Primary

  the body being hollow and its interior communicating with the fuel flow (F02M51/0675 takes precedence) · CPC title

• F02M61/168 Primary

  Assembling; Disassembling; Manufacturing; Adjusting · CPC title

• F02M2200/8061

  involving press-fit, i.e. interference or friction fit · CPC title

• F02M51/061

  using electromagnetic operating means · CPC title

• F02M2200/8084

  involving welding or soldering · CPC title