Engine brake device for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10731526-B2
Application number	US-201515315541-A
Country	US
Kind code	B2
Filing date	May 23, 2015
Priority date	Jun 5, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

An engine brake device is disclosed. The engine brake device includes at least one intake camshaft which includes at least one intake cam group having at least one firing cam and at least one braking cam, at least one intake cam follower that is assigned to the firing cam and is provided for actuating at least one intake valve in a firing mode, at least one braking intake cam follower that is assigned to the braking cam and is provided for actuating the at least one intake valve in a braking mode, and a switchover device that is assigned to the intake camshaft and is provided for the purpose of translating a torque of the intake camshaft into a force for switching between the firing mode and the braking mode.

First claim

The invention claimed is:

1. An engine brake device, comprising:
an intake camshaft which includes an intake cam group having a firing cam and a braking cam;
an intake cam follower that is assigned to the firing cam and actuates an intake valve in a firing mode;
a braking intake cam follower that is assigned to the braking cam and actuates the intake valve in a braking mode;
an intake switchover device that is assigned to the intake camshaft, the intake switchover device including a detent engagement element and a detent contour element having depressions into which the detent engagement element is biased, the intake switchover device translating a torque of the intake camshaft into a force pivoting the detent contour element for switching between the firing mode and the braking mode; and
a first rocker arm associated with the intake cam follower and a second braking rocker arm associated with the braking intake cam follower which are both pivotable about a respective rocker arm axis for actuating the intake valve;
wherein the intake switchover device includes a rocker arm mounting that defines the respective rocker arm axes and has a first end position assigned to the firing mode and a second braking end position assigned to the braking mode and wherein the rocker arm mounting is switchable between the first end position and the second braking end position by way of the torque of the intake camshaft.

2. The engine brake device according to claim 1 , wherein the intake switchover device includes a gate element that is non-rotatably but axially displaceably connected to the intake camshaft and has a slotted guide track which converts a rotational movement of the intake camshaft into a linear shifting movement of the gate element.

3. The engine brake device according to claim 1 , wherein the braking cam has at least two intake elevations.

4. The engine brake device according to claim 1 , wherein the second braking rocker arm actuates the first rocker arm.

5. The engine brake device according to claim 1 , further comprising:
an exhaust camshaft which includes an exhaust cam group having an exhaust firing cam and an exhaust braking cam;
an exhaust cam follower that is assigned to the exhaust firing cam and actuates an exhaust valve in a firing mode;
a braking exhaust cam follower that is assigned to the exhaust braking cam and actuates the exhaust valve in a braking mode; and
an exhaust switchover device that is assigned to the exhaust camshaft and translates a torque of the exhaust camshaft into a force for switching between the firing mode and the braking mode.

6. The engine brake device according to claim 5 , wherein the exhaust switchover device and the intake switchover device are activatable independently from one another.

7. The engine brake device according to claim 5 , wherein the exhaust cam follower that is assigned to the exhaust braking cam is a first exhaust cam follower, and the exhaust braking cam of the exhaust cam group is a first exhaust braking cam, wherein the engine brake device further comprises a second braking exhaust cam follower and a second exhaust braking cam, and wherein the second braking exhaust cam follower is assigned to the second exhaust braking cam and actuates a second exhaust valve in the braking mode.

8. The engine brake device according to claim 7 , wherein the first exhaust braking cam and the second exhaust braking cam have differing exhaust cam curves.

Assignees

• Daimler Ag

Inventors

• Lahr Matthias

Classifications

• F01L13/08

  for decompression, e.g. during starting; for changing compression ratio · CPC title

• F01L1/182 Primary

  the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft · CPC title

• F01L1/38

  for engines with other than four-stroke cycle, e.g. with two-stroke cycle (F01L1/26, F01L1/28 take precedence) · CPC title

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L13/065 Primary

  Compression release engine retarders of the "Jacobs Manufacturing" type · CPC title