Actuating device for an exhaust flap

Patent metadata

Field	Value
Publication number	US-9243549-B2
Application number	US-201113880886-A
Country	US
Kind code	B2
Filing date	Oct 11, 2011
Priority date	Oct 23, 2010
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

An actuating device includes an exhaust flap of a supercharging pressure control of turbocharged internal combustion engines. The exhaust flap is arranged pivotably in an exhaust pipe, in particular in the housing of a turbine of an exhaust-gas turbocharger, and controls in dependence on the compressor-side supercharging pressure the opening cross section of a bypass line which circumvents the turbine. The exhaust flap is arranged on an actuator arm which is fastened on a shaft mounted rotatably in the exhaust pipe and adjustable from outside the exhaust pipe via an adjustment lever and a control rod which is articulated thereto and via a linear control motor. In order to avoid vibration-induced buzzing noise in the actuating device, a friction damper is connected into the force flow between the shaft and the control rod, in particular for system damping in the region of the exhaust flap.

First claim

The invention claimed is:

1. An actuating device, comprising:
a control rod;
a shaft rotatably mounted in an exhaust pipe and adjustable from outside the exhaust pipe via the control rod;
an actuator arm secured on the shaft;
an exhaust flap forming part of a supercharging pressure control of a turbocharged internal combustion engine and arranged pivotally in the exhaust pipe for controlling an opening cross section of a bypass line in dependence on a compressor-side supercharging pressure, said exhaust flap being mounted on the actuator arm;
an adjustment lever to which the control rod is articulated at a joint connection; and
a friction damper connected in a force flow between the shaft and the control rod and formed by a spring arranged at the joint connection between the adjustment lever and the control rod and acting on the control rod and the adjustment lever in a region of the joint connection,
wherein the spring is formed by a U-shaped leg spring having legs acting on the control rod and on the adjustment lever,
wherein the leg spring is held non-pivotally in a defined position at the joint connection, and
wherein at least one of the legs of the leg spring has two border-side bevels which embrace a flattened portion of the control rod or the adjustment lever on both sides.

2. The actuating device of claim 1 , wherein the exhaust gas flap is arranged in a housing of a turbine of an exhaust gas turbocharger, with the bypass line circumventing the turbine.

3. The actuating device of claim 1 , wherein the joint connection comprises a bearing pin on which at least one of the control rod and the adjustment lever is mounted, said spring interacting with the bearing pin.

4. The actuating device of claim 1 , wherein the spring is attached to a bearing pin via a one-sided open oblong hole on at least one of the leg of the leg spring in transverse relationship to a joint axis of the joint connection and held in a form-fitting manner in a pull-off direction.

5. The actuating device of claim 1 , wherein the spring has at least one leg provided with a recess for positioning on a bearing pin, and further comprising at least one retaining ring secured on the bearing pin for holding the spring in place.

6. The actuating device of claim 3 , further comprising at least one friction disk attached to the bearing pin and inserted between the control rod and the adjustment lever.

7. The actuating device of claim 1 , wherein the leg spring has a semi-circular base portion provided with a slot-shaped recess for passage of the control rod.

8. The actuating device of claim 7 , wherein the recess has a width substantially corresponding to a diameter of the control rod.

9. The actuating device of claim 3 , wherein the bearing pin of the joint connection is secured by a rivet connection on the control rod or on the adjustment lever and has a shank defined by a diameter which is greater than a remaining portion of the bearing pin for insertion in a bearing bore of the adjustment lever or the control rod, and further comprising at least one retaining ring for holding the shank of the bearing pin in place.

10. An actuating device comprising:
a control rod;
a shaft rotatably mounted in an exhaust pipe and adjustable from outside the exhaust pipe via the control rod;
an actuator arm secured on the shaft;
an exhaust flap forming part of a supercharging pressure control of a turbocharged internal combustion engine and arranged pivotally in the exhaust pipe for controlling an opening cross section of a bypass line in dependence on a compressor-side supercharging pressure, said exhaust flap being mounted on the actuator arm;
an adjustment lever to which the control rod is articulated at a joint connection;
a friction damper connected in a force flow between the shaft and the control rod and formed by a spring arranged at the joint connection between the adjustment lever and the control rod and acting on the control rod and the adjustment lever in a region of the joint connection; and
at least one retaining ring secured on the bearing pin for holding the spring in place, said spring being formed by at least one disk spring which is maintained under tension by the retaining ring.

Assignees

• Hinkelmann Achim Hans
• Staneff Michael-Stefan
• SEIDEL RüDIGER
• Audi Ag
• Scherdel Innotec Forschungs—Und Entwicklungs Gmbh

Inventors

• Hinkelmann Achim Hans
• Staneff Michael-Stefan
• SEIDEL RüDIGER

Classifications

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F05D2220/40

  in turbochargers · CPC title

• F02B37/00 Primary

  Engines characterised by provision of pumps driven at least for part of the time by exhaust · CPC title

• F01D17/105 Primary

  by passing part of the fluid · CPC title

• F02B37/186

  Arrangements of actuators or linkage for bypass valves · CPC title