EP3164580A1 - Valve train having a sliding cam element - Google Patents
Valve train having a sliding cam elementInfo
- Publication number
- EP3164580A1 EP3164580A1 EP15732716.4A EP15732716A EP3164580A1 EP 3164580 A1 EP3164580 A1 EP 3164580A1 EP 15732716 A EP15732716 A EP 15732716A EP 3164580 A1 EP3164580 A1 EP 3164580A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam profile
- cam
- valve
- sliding
- valve drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010079 rubber tapping Methods 0.000 claims description 28
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/042—Cam discs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
- F01L2013/0052—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the present invention relates to a valve train with a sliding cam element which is axially displaceably received on a support shaft in an axis of rotation of the support shaft and having at least one cam profile group with mutually differently shaped cam profile sections and a tapping element, via which a control movement tapped from the cam profile sections and a Valve is transferable.
- DE 10 2007 010 155 A1 shows a valve drive with a sliding cam element in an arrangement on a carrier shaft and the sliding cam element can be axially displaced in the axis of rotation of the carrier shaft.
- a cam profile group is applied, which has different cam profile sections.
- a tapping element represented as a roller rocker arm, can interact with differently contoured cam profile sections of the cam profile group, so that the valve is actuated in dependence on the selected cam profile section.
- the cam profile sections may be contoured differently so that the valve can perform different sized or different long opening strokes.
- the roller rocker arm has a roller, and on the side facing away from the valve, the roller rocker arm is supported via a valve clearance compensation element.
- the switching times between different cam profile sections extend in operative connection with the tapping element due to a widely-executed displacement element, with the fundamental intention of providing a valve drive in which the cam profile sections can be changed as quickly as possible in contact with the tapping element.
- the sliding cam element must be moved in very short times axially between at least two positions, so that a narrow-build design of a sliding cam element would be effective.
- the object of the invention is the development of a valve train with a sliding cam element, on a support shaft which can be moved in the rotational axis direction of the carrier shaft with short switching times between different axial positions.
- the displacement length should be shortened in the direction of rotation axis, without premature wear of the valve train occurs.
- the invention includes the technical teaching that at least two mutually identical cam profile groups are formed on the sliding cam element, which cooperate for the common control of a valve with a single tap element.
- the invention is based on the idea of dividing a required contact width between the cam profile sections of a cam profile group with a tapping element in two individual widths.
- a twin sliding cam member is formed, and the displacement speed of the sliding cam member in the rotation axis direction is considerably increased due to the shortened path.
- the switching of the sliding cam element can also take place at higher rotational speeds of the camshaft, since the displacement length of the sliding cam element on the carrier shaft is shortened.
- the paired cam profile sections need not necessarily have half the width, which has a common cam profile section with a single contact between the cam profile section and a tap element for controlling a valve.
- An approximate halving is, however, possible because it allows the width of the cam profile group can be approximately halved, while always two individual lines of contact between the Abgriffselement and the sliding cam element on separately arranged cam profile sections are present, so that each transferable with a contact forces per cam profile section are approximately halved.
- Over the line contact between the cam profile section and the tap element results in a line load, which is approximately equal to a conventional tap by a tap element with a continuous, single contact line.
- the tapping element may comprise at least two rollers, wherein a first roller cooperates with the cam profile sections of a first cam profile group and wherein a second roller cooperates with the cam profile sections of a second cam profile group.
- the cam profile groups can be formed adjacent and adjacent to each other on the sliding cam element, so that the sliding cam element does not widen unnecessarily.
- the rollers on the tapping element can be received in a common roller axis and have a same diameter to each other.
- the tapping element can be designed as a drag lever, in particular as a roller finger follower, and the two rollers can be mounted parallel to one another on a common axis.
- the rollers may cooperate with cam profile sections which have a cam contour which is identical to one another, and a clearance which is so large that it corresponds at least to the width of one cam profile section or two cam profile sections of a cam profile group may be formed between the rollers on the tapping element. For example, if the cam profile group has three different cam profile sections, then the gap between the rollers must be at least so wide that two further cam profile sections that are temporarily out of contact with the tapping element can not fall between the rollers.
- cam profile sections can share a common
- Cam base circle portion having in particular a same over the width of the sliding cam member diameter.
- the sliding cam member may be integrally formed with the two cam profile groups, wherein the two cam profile groups also form a first contact portion with a first tapping member, and another pair of cam profile groups may be mounted on the same sliding cam member which controls another valve via another tappet member.
- FIG. 1 shows a side view of a valve train with the features of the present invention
- FIG 2 is a perspective view of the valve gear according to Figure 1 and
- FIG. 3 shows a further side view of the valve drive according to FIGS. 1 and 2.
- valve train 1 is shown with the features essential to the invention in second side views and in a perspective view.
- the valve drive 1 has a sliding cam element 10, which is designed in one piece and is received on a support shaft 1 1 in an axis of rotation 12 axially displaceable.
- the carrier shaft 1 1 is shown only in sections, and the sliding cam member 10 may be provided not shown in detail means to move it in the rotation axis direction.
- cam profile groups 13 On sliding cam element 10, two mutually identically formed cam profile groups 13 are formed.
- the cam profile groups 13 point for example, three cam profile sections 14, wherein a cam profile section 14 are designed as Nullhubnocke and two other cam profile sections 14 with different lifting heights.
- the cam profile sections 14 adjoin one another in the axial direction.
- a tapping element 15 cooperates, which transmits the lifting information of the cam profile groups 13 to a valve 16.
- the valve 16 is further shown with a valve spring 21, and on the opposite side of the valve 16 of the Abgriffsiatas 15 is a support member 20 which can serve as a valve clearance compensation element and on which the tapping element 15 is supported.
- the tapping element 15 is executed in the illustrated embodiment as a roller cam followers with rollers 17 which are received in a common roller axle 18 on the main body of the tapping element 15.
- the rollers 17 are received at a distance from each other on the tapping element 15 and the distance corresponds to the distance of two equally executed cam profile sections 14 from the respective cam profile groups 13 of the sliding cam element 10. This creates a twin contact between the tapping element 15 and the sliding cam element 10th
- the cam profile sections 14 of the cam profile groups 13 are designed with a width B which is smaller than a required width of cam profile sections 14 when they form the tap contact for controlling a valve 16 with one of the two rollers 17.
- the width B of the cam profile sections 14 may be about half as large as a width of cam profile sections that form a single contact with a tapping element 15.
- the rollers 17 may have a width which is about half as large as a width that would be required if only one roller 17 of a tapping element 15 is in contact with a cam profile section 14 and picks up a lifting movement thereof.
- the sliding cam member 10 has an overall width substantially equal to a total width of a sliding cam member 10 having conventionally formed cam profile groups 13, the required axial displacement of the sliding cam member 10 in the rotational axis direction is smaller since the cam profile portions 14 are narrower and thus reduced also the way in the direction of rotation axis, by which the sliding cam member 10 must be displaced to make a change of the tap of the rollers 17 between different cam profile sections 14.
- the actuating forces of the tapping element 15, which are caused by the cam profiles of the cam profile sections 14, are divided into equally formed cam profile sections 14 in contact with the two rollers 17 in equal parts. This creates a line load in the line of contact between the rollers 17 and the cam profile sections 14 which is the same as if only one roller 17 were made wider, and cooperated with a single cam profile section 14 of an individual cam contour.
- Sliding cam element 10 is present.
- the sliding cam member 10 can be adjusted even at higher speeds of the valve train 1, for example, above 4000 1 / min.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014109243.0A DE102014109243B3 (en) | 2014-07-02 | 2014-07-02 | Valve drive with a sliding cam element |
PCT/EP2015/064930 WO2016001274A1 (en) | 2014-07-02 | 2015-07-01 | Valve train having a sliding cam element |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3164580A1 true EP3164580A1 (en) | 2017-05-10 |
EP3164580B1 EP3164580B1 (en) | 2018-09-12 |
Family
ID=53496722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15732716.4A Active EP3164580B1 (en) | 2014-07-02 | 2015-07-01 | Valve train with sliding cam element |
Country Status (5)
Country | Link |
---|---|
US (1) | US10711664B2 (en) |
EP (1) | EP3164580B1 (en) |
CN (1) | CN106471223B (en) |
DE (1) | DE102014109243B3 (en) |
WO (1) | WO2016001274A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016204889A1 (en) * | 2016-03-23 | 2017-09-28 | Mahle International Gmbh | Valve train for an internal combustion engine |
DE102016204892A1 (en) * | 2016-03-23 | 2017-09-28 | Mahle International Gmbh | Valve train for an internal combustion engine |
DE102018123030A1 (en) * | 2018-09-19 | 2020-03-19 | Thyssenkrupp Ag | Sliding cam element, valve train, internal combustion engine, use and method for controlling valves |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2753197A1 (en) | 1976-12-15 | 1978-06-22 | Eaton Corp | VALVE CONTROL DEVICE |
US4516542A (en) * | 1982-06-02 | 1985-05-14 | Nissan Motor Co., Ltd. | Valve operation changing system of internal combustion engine |
DE4142197A1 (en) * | 1991-12-20 | 1993-04-08 | Daimler Benz Ag | Rocker for valve drive - has cylindrical lock to connect independently movable rocker arms |
DE102006058093A1 (en) * | 2006-12-09 | 2008-06-12 | Schaeffler Kg | valve train |
DE102007010155A1 (en) * | 2007-03-02 | 2008-09-04 | Audi Ag | Camshaft for IC engine has two cam followers plus a circular cam which slides axially into the cam bearing for the non operating valve setting |
DE102007020128A1 (en) * | 2007-04-28 | 2008-10-30 | Schaeffler Kg | Cylinder valve cam drive, for an internal combustion motor, has a release mounting between the supports and the cam follower to equalize tolerances automatically on installation |
DE102010005790B4 (en) * | 2010-01-25 | 2012-03-15 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Valve gear for actuating gas exchange valves of internal combustion engines |
DE102010011828A1 (en) * | 2010-03-18 | 2011-09-22 | Schaeffler Technologies Gmbh & Co. Kg | Switchable lever for a valve train of an internal combustion engine |
DE102012103751B4 (en) * | 2012-04-27 | 2023-06-15 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Internal combustion engine and valve train for an internal combustion engine |
-
2014
- 2014-07-02 DE DE102014109243.0A patent/DE102014109243B3/en active Active
-
2015
- 2015-07-01 CN CN201580036299.9A patent/CN106471223B/en active Active
- 2015-07-01 US US15/320,382 patent/US10711664B2/en active Active
- 2015-07-01 EP EP15732716.4A patent/EP3164580B1/en active Active
- 2015-07-01 WO PCT/EP2015/064930 patent/WO2016001274A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
CN106471223B (en) | 2020-03-24 |
US20170138231A1 (en) | 2017-05-18 |
WO2016001274A1 (en) | 2016-01-07 |
US10711664B2 (en) | 2020-07-14 |
CN106471223A (en) | 2017-03-01 |
EP3164580B1 (en) | 2018-09-12 |
DE102014109243B3 (en) | 2015-11-12 |
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