F01L 1/344
Changing the angular relationship between crankshaft and camshaft
Official title: changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
F01L1/344 (Changing the angular relationship between crankshaft and camshaft) appears on 3,679 US grants and 3,333 published applications in this corpus.
Search patents in F01L- Granted patents
- 3,679
- Published applications
- 3,333
- Assignees
- 415
- Inventors
- 3,579
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 4 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 9 | 0 |
| 1985 | 14 | 0 |
| 1986 | 14 | 0 |
| 1987 | 8 | 0 |
| 1988 | 13 | 0 |
| 1989 | 18 | 0 |
| 1990 | 16 | 0 |
| 1991 | 30 | 0 |
| 1992 | 58 | 0 |
| 1993 | 49 | 0 |
| 1994 | 37 | 0 |
| 1995 | 21 | 0 |
| 1996 | 38 | 0 |
| 1997 | 44 | 0 |
| 1998 | 63 | 0 |
| 1999 | 57 | 0 |
| 2000 | 59 | 0 |
| 2001 | 101 | 45 |
| 2002 | 104 | 103 |
| 2003 | 97 | 132 |
| 2004 | 121 | 95 |
| 2005 | 114 | 166 |
| 2006 | 117 | 136 |
| 2007 | 126 | 177 |
| 2008 | 113 | 167 |
| 2009 | 84 | 178 |
| 2010 | 124 | 169 |
| 2011 | 115 | 155 |
| 2012 | 147 | 163 |
| 2013 | 140 | 195 |
| 2014 | 213 | 151 |
| 2015 | 187 | 185 |
| 2016 | 136 | 206 |
| 2017 | 155 | 223 |
| 2018 | 202 | 167 |
| 2019 | 188 | 139 |
| 2020 | 168 | 132 |
| 2021 | 113 | 74 |
| 2022 | 76 | 77 |
| 2023 | 55 | 37 |
| 2024 | 66 | 25 |
| 2025 | 27 | 21 |
| 2026 | 14 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01L 1/3442Using hydraulic chambers with variable volume to transmit the rotating force2,363
- F01L 1/352Using bevel or epicyclic gear549
- F01L 1/34403Using helically teethed sleeve or gear moving axially between crankshaft and camshaft331
- F01L 1/34409By torque-responsive means253
- F01L 2001/34486Location and number of the means for changing the angular relationshipIndexing code234
- F01L 1/356Making the angular relationship oscillate178
- F01L 1/34413Using composite camshafts110
- F01L 1/348By means acting on timing belts or chains67
All 9 subgroupsShow fewer
Recent patents
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- Valve opening-closing timing control device30 Jun 2026US 12,669,072 B2Aisin Corporation
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- Vane seal spring8 Oct 2026US 2026/0309060 A1
- Variable cam timing phaser8 Oct 2026US 2026/0309061 A1
- Variable cam timing phaser and method of assembling the same8 Oct 2026US 2026/0309062 A1
- Carrier-less spring loaded planetary gearset used with evct8 Oct 2026US 2026/0309063 A1BorgWarner Inc.
- Hydraulic camshaft phaser for variable valve control of a combustion engine and method for operating a hydraulic camshaft phaser13 Aug 2026US 2026/0235054 A1Schaeffler Technologies AG & Co. KG
Most cited
By later US patents
- Premixed charge compression ignition engine with optimal combustion control196US 6,276,334 B1Cummins Engine Company, Inc. · 2001
- System and method for engine fuel blend control110US 7,287,492 B2Ford Global Technologies, LLC · 2007
- Internal combustion engine102US 4,805,571 AHumphrey Cycle Engine Partners, L.P. · 1989
- Device for adjusting an angular phase difference between two elements100US 4,858,572 AAisin Seiki Kabushiki Kaisha · 1989
- Variable camshaft timing for internal combustion engine95US 5,107,804 ABorg-Warner Automotive Transmission & Engine Components Corporation · 1992