# US 11,898,526 B2 · Fuel injector valve seat assembly including insert locating and retention features

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- Number: US 11,898,526 B2
- Document ID: US11898526B2
- Status: Granted
- Kind: B2
- Application number: 17/049,713
- Filed: 2019-04-23
- Published: 2021-05-13
- Granted: 2024-02-13
- Earliest claimed: 2018-04-25
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Guenter Dantes; Todd Wallace Helsel; Manoj Menon; John Seifert; Thomas Stach; Ryan Cary; Sudhir Srinivasan; Fabian Lischke; Juergen Lander; Sebastian Wieschollek; James Doetsch; Peter Glibota
- Web page: https://patentgrep.com/patent/US11898526B2

## CPC

- F02M 61/168: {Assembling; Disassembling; Manufacturing; Adjusting}
- F02M 61/18: Injection nozzles, e.g. having valve seats; {Details of valve member seated ends, not otherwise provided for}
- F02M 61/1853: {Orifice plates}
- F02M 61/1886: {Details of valve seats not covered by groups F02M61/1866 - F02M61/188}
- F02M 2200/8015: Provisions for assembly of fuel injection apparatus in a certain orientation, e.g. markings, notches or specially shaped sleeves other than a clip
- F02M 2200/8023: the assembly involving use of quick-acting mechanisms, e.g. clips
- F02M 2200/8061: involving press-fit, i.e. interference or friction fit
- F02M 2200/8084: involving welding or soldering
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A fuel injector (1) including a fuel injector housing (2), a valve seat (4) formed at one end of the fuel injector housing, and a valve body (10) disposed in the fuel injector housing and operable to open and close a spray hole (20) in the valve seat. The valve seat includes a base portion (16) and insert portion (26) having spray holes (8) that is secured to the base portion (16).

## Claims

### Claim 1

A fuel injector comprising
a fuel injector housing;
a valve seat disposed in the fuel injector housing, the valve seat including
a base that is mechanically connected to an end of the fuel injector housing and includes an inner surface, and
an insert that cooperates with the base to define a spray hole that extends between the inner surface and an exterior of the valve seat; and
a valve body disposed in the fuel injector housing and operable to move along a longitudinal axis of the fuel injector housing between a first position in which the valve body abuts the inner surface and in which fluid is prevented from passing through the spray hole, and a second position in which the valve body is spaced apart from the inner surface and in which fluid is permitted to pass through the spray hole, wherein
a surface of the insert includes surface features that engage with corresponding surface features formed on a surface of the base so as to retain the insert in a predetermined rotational orientation about the longitudinal axis relative to the base,
the insert has a polygonal peripheral shape when viewed in a cross section that is transverse to the longitudinal axis, a corner of the polygonal peripheral shape of the insert corresponding to one of the surface features of the insert, and
the insert is disposed in a vacancy of the base that has a corresponding peripheral shape, a corner of the polygonal peripheral shape of the vacancy corresponding to one of the surface features of the base.

### Claim 2

A fuel injector comprising:
a fuel injector housing
a valve seat disposed in the fuel injector housing, the valve seat including a base that is mechanically connected to an end of the fuel injector housing and includes a concave inner surface, and an insert that cooperates with the base to define a spray hole that extends between the concave inner surface and an exterior of the valve seat; and a valve body disposed in the fuel injector housing and operable to move along a longitudinal axis of the fuel injector housing between a first position in which the valve body abuts the concave inner surface and in which fluid is prevented from passing through the spray hole, and a second position in which the valve body is spaced apart from the concave inner surface and in which fluid is permitted to pass through the spray hole; wherein a surface of the insert includes surface features that engage with corresponding surface features formed on a surface of the base so as to retain the insert in an assembled configuration with and in direct contact with the base, and the insert is received within a vacancy that is formed in the base, and wherein the surface features of the insert include a clip portion that engages the corresponding surface features formed on the surface of the base, and the corresponding surface features formed on the surface of the base include one of a shoulder, a groove, a recess and a protrusion.