US 2020/0400047 A1Published application

Valve train including engine braking system

AssigneeSchaeffler Technologies AG & Co. KG

InventorEric Berndt

Life of this patent

Estimating the term…

Loading patent…

Abstract

A valve train arrangement including at least one exhaust valve and a reverse-spring hydraulic lash adjuster (RSHLA) is provided. The RSHLA has a predetermined closing velocity. An engine brake system is configured to engage the exhaust valve, such that: (i) upon activation of the engine brake system, the engine brake system engages the at least one exhaust valve to open the at least one exhaust valve; and (ii) upon deactivation of the engine brake system, the engine brake system disengages the at least one exhaust valve such that the at least one exhaust valve is closed. A deactivation velocity of the engine brake system is less than the predetermined closing velocity of the RSHLA.

Claims18

Dependent claims

A valve train arrangement comprising:

at least one exhaust valve;
a support arranged adjacent to the at least one exhaust valve and configured to engage a lobe defined on a camshaft, the support defining a cavity;
a reverse-spring hydraulic lash adjuster (RSHLA) positioned within the cavity of the support, the RSHLA configured to adjust lash between the support and the at least one exhaust valve, and the RSHLA having a predetermined closing velocity;
and
an engine brake system configured to engage the exhaust valve, such that:
(i) upon activation of the engine brake system, the engine brake system engages the at least one exhaust valve to open the at least one exhaust valve;
(ii) upon deactivation of the engine brake system, the engine brake system disengages the at least one exhaust valve such that the at least one exhaust valve is closed;
wherein a deactivation velocity of the engine brake system is lower than the predetermined closing velocity of the RSHLA.

5 more elements

A method of accommodating lash in a valve train including an engine braking system, the method comprising:

arranging a reverse-spring hydraulic lash adjuster (RSHLA) between (i) a support engaging a lobe defined on a camshaft, and (ii) at least one exhaust valve;
activating an engine brake system to drive the at least one exhaust valve to an open position, wherein the RSHLA expands to maintain contact with the support and the at least one exhaust valve;
and
deactivating the engine brake system such that engine brake system disengages from the at least one exhaust valve, and the RSHLA compresses as the at least one exhaust valve returns to a closed position while the RSHLA maintains contact with the support and the at least one exhaust valve.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/449,642Filed 24 Jun 2019
Published: 24 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F01L 13/06
Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations: for braking
F01L 13/065
For braking: compression release engine retarders of the "Jacobs Manufacturing" type
F01L 1/2411
By fluid means, e.g. hydraulically: by means of a hydraulic adjusting device located between the valve stem and rocker arm
F01L 1/2416
By fluid means, e.g. hydraulically: by means of a hydraulic adjusting device attached to an articulated rocker

Family

US 11,060,427 B2Related patent
US 2020/0400047 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key