F01L 13/0015
Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or
Official title: {for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque}
F01L13/0015 (Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or) appears on 2,642 US grants and 2,374 published applications in this corpus.
Search patents in F01L- Granted patents
- 2,642
- Published applications
- 2,374
- Assignees
- 372
- Inventors
- 2,910
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 7 | 0 |
| 1980 | 8 | 0 |
| 1981 | 7 | 0 |
| 1982 | 7 | 0 |
| 1983 | 10 | 0 |
| 1984 | 12 | 0 |
| 1985 | 21 | 0 |
| 1986 | 11 | 0 |
| 1987 | 14 | 0 |
| 1988 | 22 | 0 |
| 1989 | 21 | 0 |
| 1990 | 17 | 0 |
| 1991 | 18 | 0 |
| 1992 | 27 | 0 |
| 1993 | 25 | 0 |
| 1994 | 26 | 0 |
| 1995 | 25 | 0 |
| 1996 | 17 | 0 |
| 1997 | 23 | 0 |
| 1998 | 35 | 0 |
| 1999 | 34 | 0 |
| 2000 | 39 | 0 |
| 2001 | 37 | 25 |
| 2002 | 68 | 68 |
| 2003 | 70 | 75 |
| 2004 | 70 | 99 |
| 2005 | 90 | 136 |
| 2006 | 112 | 145 |
| 2007 | 125 | 165 |
| 2008 | 125 | 139 |
| 2009 | 78 | 165 |
| 2010 | 111 | 129 |
| 2011 | 116 | 92 |
| 2012 | 118 | 92 |
| 2013 | 92 | 92 |
| 2014 | 94 | 102 |
| 2015 | 122 | 116 |
| 2016 | 79 | 117 |
| 2017 | 102 | 141 |
| 2018 | 119 | 128 |
| 2019 | 128 | 97 |
| 2020 | 135 | 76 |
| 2021 | 70 | 55 |
| 2022 | 48 | 42 |
| 2023 | 25 | 20 |
| 2024 | 36 | 28 |
| 2025 | 27 | 20 |
| 2026 | 8 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01L 13/0036The valves being driven by two or more cams with different shape1,161
- F01L 13/0021By modification of rocker arm ratio662
- F01L 13/0063By modification of cam contact point by displacing an intermediate lever or576
- F01L 13/0031By modification of tappet or pushrod length228
- F01L 13/0057By splittable or deformable cams63
- F01L 2013/0089With means for delaying valve closingIndexing code63
- F01L 2013/0078By modification of cam contact point by axially displacing the camshaftIndexing code35
- F01L 2013/0084By modification of cam contact point by radially displacing the camshaftIndexing code23
Recent patents
- Variable duration valve train9 Jun 2026US 12,650,087 B1
- Rocker arm for brake with integrated hydraulic capsule7 Apr 2026US 12,595,755 B2Eaton Intelligent Power Limited
- Engine valve control system and method24 Mar 2026US 12,584,425 B1
- Variable valve device24 Mar 2026US 12,584,426 B2Suzuki Motor Corporation
- Internal combustion engine with optimized intake system24 Feb 2026US 12,560,108 B2Dumarey Automotive Italia S.p.A.
- Engine13 Aug 2026US 2026/0235053 A1Ishikawa Energy Research Co., Ltd.
- Engine braking device with returning and limiting functions and engine30 Jul 2026US 2026/0218633 A1Zhejiang Liming Intelligent Manufacturing Co., Ltd.
- Deactivation mechanism and associated valve events for divided exhaust boost (deb) engine23 Jul 2026US 2026/0210303 A1Aramco Services Company
- Valve lift conversion control mechanism and valve system of engine9 Jul 2026US 2026/0193997 A1Weichai Power Co., Ltd.
- Cylinder deactivation system25 Jun 2026US 2026/0176991 A1
Most cited
By later US patents
- Vehicle operating method and system115US 6,223,846 B12001
- System for controlling a valve mechanism for an internal combustion engine104US 5,398,502 AFuji Jukogyo Kabushiki Kaisha · 1995
- Internal combustion engine102US 4,805,571 AHumphrey Cycle Engine Partners, L.P. · 1989
- Method for shutting down and restarting individual cylinders of an engine100US 5,803,040 AMercedes-Benz AG · 1998
- Multipositional lift rocker arm assembly97US 6,532,920 B1Ford Global Technologies, LLC · 2003