US 12,188,420 B2Granted

Combined engine braking and positive power engine lost motion valve actuation system

AssigneeJacobs Vehicle Systems, Inc.

InventorsKevin P. Groth, Brian L. Ruggiero, Shengqiang Huang, Neil E. Fuchs, John J. Lester, Steven N. Ernest, Joseph Paturzo

Life of this patent

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Abstract

A system for actuating one or more engine valves for positive power operation and engine braking operation is disclosed. In a preferred embodiment, an exhaust valve bridge and intake valve bridge each receive valve actuations from two sets of rocker arms. Each valve bridge includes a sliding pin for actuating a single engine valve and an outer plunger disposed in the center of the valve bridge to actuate two engine valves through the bridge. The outer plunger of each valve bridge may be selectively locked to its valve bridge to provide positive power valve actuation. During engine braking, application of hydraulic pressure to the outer plungers may cause the respective valve bridges and outer plungers to unlock so that all engine braking valve actuations are provided from a rocker arm acting on one engine valve through the sliding pin.

Claims10

Dependent claims

A valve bridge for use in an internal combustion engine comprising a plurality of cylinders, the valve bridge comprising:

a valve bridge body configured to extend between two valves for a cylinder of the plurality of cylinders, the valve bridge body having a central opening extending through a thickness of the valve bridge body at a location between the two valves;
and
a first lost motion assembly disposed within the central opening and selectively operable to lose all valve actuation motions applied to the first lost motion assembly,
wherein the valve bridge body further comprises a side opening having a sliding pin disposed therein, the side opening and sliding pin configured to align with a first valve of the two valves,
wherein engine braking events are imparted to the first valve of the two valves via the sliding pin and a second lost motion assembly that is capable of selective actuation according to different operating conditions of the internal combustion engine.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/689,937Filed 20 Nov 2019 · division
Priority: 27 Jul 2010
Published: US 2020/0141335 A17 May 2020
Granted: 7 Jan 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F02D 13/04
During engine operation: using engine as brake
F01L 1/18
Transmitting gear between valve drive and valve: rocking arms or levers
F01L 1/26
Valve-gear or valve arrangements, e.g. lift-valve gear: characterised by the provision of two or more valves operated simultaneously by same…
F01L 13/0005
Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations: deactivating valves

Family

Application61/368,248Us provisional application · filed 27 Jul 2010
Application13/192,330Parent of this continuation · filed 27 Jul 2011
Application14/274,899Parent of this division · filed 12 May 2014
US 8,936,006 B2Parent of this continuation · filed 20 Jan 2015
US 2020/0141335 A1Pre-grant publication · published 7 May 2020
Application14/274,899Parent of this continuation
US 10,851,717 B2Related patent
US 2012/0024260 A1Published application
US 2014/0245992 A1Published application
US 12,188,420 B2This patent

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