COUPLING DEVICE

• US 20100258085A1
• Filed: 04/12/2010
• Published: 10/14/2010
• Est. Priority Date: 04/14/2009
• Status: Abandoned Application

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Giorgetti, Edoardo, Serra, Giandomenico
• Application Number:
  US12/758,516
• Publication Number:
  US 20100258085A1
• Time in Patent Office: Days
• US Class Current: 123/470
• CPC Class Codes: F02M 2200/16 Sealing of fuel injection apparatus not otherwise provided for
• CPC Class Codes: F02M 2200/856 characterised by mounting injector to fuel or common rail, or vice versa
• CPC Class Codes: F02M 55/02 Conduits between injection pumps and injectors , e.g. conduits between pump and common-rail or conduits between common-rail and injectors
• CPC Class Codes: F02M 61/14 Arrangements of injectors with respect to engines; Mounting of injectors
• CPC Class Codes: F02M 69/462 Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A coupling device for hydraulically and mechanically coupling an injection valve to a fuel rail of a combustion engine has a fuel injector cup with a central longitudinal axis and can be hydraulically coupled to the fuel rail and engages a fuel inlet tube of the injection valve, a first retaining element is fixedly coupled to the cup, a second retaining element is fixedly coupled to the valve, the second element being coupled to the first element to prevent a movement of the second element relative to the first element in a first direction of the central longitudinal axis to retain the valve in the cup, and a damper element which is arranged axially between the cup and the valve body. The damper element limits a movement of the valve relative to the cup in a second direction of the central longitudinal axis opposing the first direction.

Claims

1. A coupling device for hydraulically and mechanically coupling an injection valve to a fuel rail of a combustion engine, the injection valve comprising a valve body and a fuel inlet tube being arranged in the valve body, the coupling device comprising:

a fuel injector cup having a central longitudinal axis and being designed to be hydraulically coupled to the fuel rail and to engage the fuel inlet tube of the injection valve,

a first retaining element being fixedly coupled to the fuel injector cup, a second retaining element being fixedly coupled to the injection valve, the second retaining element being coupled to the first retaining element to prevent a movement of the second retaining element relative to the first retaining element in a first direction of the central longitudinal axis to retain the injection valve in the fuel injector cup, and

a damper element being arranged axially between the fuel injector cup and the valve body and being designed to limit a movement of the injection valve relative to the fuel injector cup in a second direction of the central longitudinal axis opposing the first direction.

2. The coupling device according to claim 1, wherein the damper element is a spring.

3. The coupling device according to claim 1, wherein the damper element is a ring of a frustoconical shape.

4. The coupling device according to claim 1, wherein the fuel injector cup has an inner wall comprising a step facing the valve body and being designed to support the damper element in axial direction.

5. A coupling device for hydraulically and mechanically coupling an injection valve to a fuel rail of a combustion engine, the coupling device comprising:

a fuel injector cup having a central longitudinal axis and being designed to be hydraulically coupled to the fuel rail and to engage a fuel inlet tube of the injection valve, wherein the fuel inlet tube is arranged in a valve body,

a first retaining element being fixedly coupled to the fuel injector cup, a second retaining element being fixedly coupled to the injection valve, the second retaining element being coupled to the first retaining element to prevent a movement of the second retaining element relative to the first retaining element in a first direction of the central longitudinal axis to retain the injection valve in the fuel injector cup, and

a damper element being arranged axially between the fuel injector cup and the valve body and being designed to limit a movement of the injection valve relative to the fuel injector cup in a second direction of the central longitudinal axis opposing the first direction.

6. The coupling device according to claim 5, wherein the damper element is a spring.

7. The coupling device according to claim 5, wherein the damper element is a ring of a frustoconical shape.

8. The coupling device according to claim 5, wherein the fuel injector cup has an inner wall comprising a step facing the valve body and being designed to support the damper element in axial direction.

9. A method for hydraulically and mechanically coupling an injection valve to a fuel rail of a combustion engine, the injection valve comprising a valve body and a fuel inlet tube being arranged in the valve body, the method comprising the steps of:

providing a fuel injector cup having a central longitudinal axis and being designed to be hydraulically coupled to the fuel rail and to engage the fuel inlet tube of the injection valve,

coupling a first retaining element fixedly to the fuel injector cup, and a second retaining element fixedly to the injection valve, wherein the second retaining element being coupled to the first retaining element to prevent a movement of the second retaining element relative to the first retaining element in a first direction of the central longitudinal axis to retain the injection valve in the fuel injector cup, and

arranging a damper element axially between the fuel injector cup and the valve body to limit a movement of the injection valve relative to the fuel injector cup in a second direction of the central longitudinal axis opposing the first direction.

10. The method according to claim 9, wherein the damper element is a spring.

11. The method according to claim 9, wherein the damper element is a ring of a frustoconical shape.

12. The method according to claim 9, wherein the fuel injector cup has an inner wall comprising a step facing the valve body and being designed to support the damper element in axial direction.