WO1998011327A1 - Schlepphebel für einen ventiltrieb einer hubkolbenbrennkraftmaschine - Google Patents
Schlepphebel für einen ventiltrieb einer hubkolbenbrennkraftmaschine Download PDFInfo
- Publication number
- WO1998011327A1 WO1998011327A1 PCT/EP1997/003088 EP9703088W WO9811327A1 WO 1998011327 A1 WO1998011327 A1 WO 1998011327A1 EP 9703088 W EP9703088 W EP 9703088W WO 9811327 A1 WO9811327 A1 WO 9811327A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rocker arm
- roller
- side walls
- radius
- sheet metal
- Prior art date
Links
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
- F01L1/10—Valve drive by means of crank-or eccentric-driven rods
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the invention relates to a rocker arm manufactured as a sheet metal part without cutting for a valve train of a reciprocating piston internal combustion engine, which, seen in cross section, has a U-shaped profile whose upper transverse wall facing a cam in a central section of the rocker arm has a substantially rectangular opening in plan view for receiving has a roller which rolls on the circumference of the cam, and whose side walls which extend downward from the transverse wall receive a bolt for mounting the roller, the side walls being convex at their edges delimiting the opening.
- rocker arms for the valve train of reciprocating piston internal combustion engines were mostly designed as castings and, in order to reduce the friction occurring at the point of application of the cam on the rocker arm, were provided with a roller-mounted roller.
- This design of the rocker arm could also be adhered to during its manufacture from sheet metal, this sheet metal finger follower being produced without cutting by cold forming the sheet metal.
- the invention is therefore based on the object of stiffening the rocker arm produced from a sheet-metal process without the width of the rocker arm being influenced thereby.
- this object is achieved by changing the vertical extent of the side walls, which is enlarged to such an extent that the roller lies within this extent of the side walls.
- the stiffness of the rocker arm can thus be increased by increasing the side walls in the direction of the cam. All other dimensions of the rocker arm do not change, so that this structural change does not affect the other structural dimensions of the rocker arm.
- a radius of the convex edges should correspond to a radius of the roller.
- the side walls, the convex edges of which have an apex in the region of a plane through a longitudinal central axis of the bolt, would end with the radius of the roller.
- the cam would have to dip into the rectangular opening.
- recesses should be present in surfaces of the edges which are adjacent to the two end faces of the roller. By means of these recesses can be safely prevented that the cam lever actuating cam starts up on its side walls due to slight axial movements of the rocker arm. These recesses also have the advantage that spray oil can collect in them, which is directed to the end faces of the roller and thus into the rolling bearing.
- the side walls can also run in a Z-shaped manner in the region of the opening above the bolt arrangement.
- a Z-shaped course means that, starting from their vertical course, the side walls are first angled horizontally and then angled vertically again. This Z-shaped course prevents a weakening of the cross section that would occur if the recess were arranged.
- the Z-shaped course of the side walls creates ribs on the outside thereof, these ribs do not have the disadvantage of the ribs provided according to the prior art at the lower edge of the rocker arm.
- the side walls have a curvature on their outer surface in the region of the upper edges, so that even in the case of this proposed deformation there is no risk that immediately adjacent rocker arms are arranged at a greater distance due to these ribs in the upper region of the side walls Need to become.
- FIG. 1 shows a side view of a rocker arm according to the invention
- FIG. 2 shows a longitudinal section through the rocker arm according to FIG. 1,
- Figure 4 shows a further embodiment of a rocker arm with a section through this rocker arm in the region of a roller arranged therein.
- FIG. 1 denotes a rocker arm which can be supported in a first end region 2 on a support element (not shown), which receives a roller 3 in a central region and which engages in a second end region 4 on a valve stem end of a gas exchange valve (also not shown).
- the roller 3 is rotatably supported by a pin 5 in the rocker arm 1 and can be acted upon by a cam 6 of a camshaft.
- the entire rocker arm is U-shaped, i. that is, the U-shaped profile is open in this preferred embodiment on the side facing away from the cam 6.
- the rocker arm 1 is an upper transverse wall 7 and side walls 8, 9, which can be seen in detail in the other Figure 3.
- the transverse wall 7 is provided in the central section of the rocker arm 1 with a rectangular opening 10.
- the roller 3 is mounted above the pin 5 in corresponding holes 13 and 14, a needle bearing, not shown, being arranged between the pin 5 and the roller 3 is.
- the roller 3 lies within the vertical extent of the side walls 8 and 9. This allows the rocker arm to be stiffened in an advantageous manner.
- the side walls are deformed parallel to the outside by a certain amount, so that there is an overall Z-shaped course.
- a radius R 2 at the base of the recesses This results in sickle-shaped recesses 15 and 16 in longitudinal section.
- side walls 17 and 18 are provided with recesses 19 and 20 which are formed in these side walls 17 and 18 by means of a non-cutting stamping process.
- These recesses 19 and 20 have the same function as the recesses of FIG. 3 produced by the Z-shaped deformation of the rocker arm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/242,965 US6021750A (en) | 1996-09-12 | 1997-06-13 | Finger lever for a valve drive of an internal combustion piston engine |
JP10513178A JP2001500207A (ja) | 1996-09-12 | 1997-06-13 | 往復行程ピストン内燃機関の弁駆動装置のためのロッカーアーム |
DE19780946T DE19780946D2 (de) | 1996-09-12 | 1997-06-13 | Schlepphebel für einen Ventiltrieb einer Hubkolbenbrennkraftmaschine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19637069A DE19637069A1 (de) | 1996-09-12 | 1996-09-12 | Schlepphebel für einen Ventiltrieb einer Hubkolbenbrennkraftmaschine |
DE19637069.8 | 1996-09-12 | ||
US2779396P | 1996-10-01 | 1996-10-01 | |
US60/027,793 | 1996-10-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998011327A1 true WO1998011327A1 (de) | 1998-03-19 |
Family
ID=26029291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/003088 WO1998011327A1 (de) | 1996-09-12 | 1997-06-13 | Schlepphebel für einen ventiltrieb einer hubkolbenbrennkraftmaschine |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP2001500207A (de) |
KR (1) | KR20000036004A (de) |
DE (1) | DE19780946D2 (de) |
WO (1) | WO1998011327A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6199527B1 (en) | 1998-03-12 | 2001-03-13 | Nsk Ltd. | Sheet metal rocker arm, manufacturing method thereof, cam follower with said rocker arm, and assembling method thereof |
EP1923546B1 (de) | 2005-09-08 | 2012-06-06 | Honda Motor Co., Ltd. | Ventilansteuervorrichtung für motor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1954365A1 (de) * | 1969-10-29 | 1971-05-06 | Burgdorf Maerten Dr Ing | Verfahren zur Verminderung des Querschnittes von hohlen,insbesondere rohrfoermigen Werkstuecken |
US4872429A (en) * | 1987-12-14 | 1989-10-10 | Ford Motor Company | Method of making low friction finger follower rocker arms |
DE3929486A1 (de) * | 1988-09-12 | 1990-03-15 | Henley Mfg Co | Nockenstoessel-kipphebel |
US5048475A (en) * | 1991-01-17 | 1991-09-17 | Henley Manufacturing Holding Company, Inc. | Rocker arm |
-
1997
- 1997-06-13 KR KR1019997001961A patent/KR20000036004A/ko not_active Application Discontinuation
- 1997-06-13 DE DE19780946T patent/DE19780946D2/de not_active Ceased
- 1997-06-13 WO PCT/EP1997/003088 patent/WO1998011327A1/de not_active Application Discontinuation
- 1997-06-13 JP JP10513178A patent/JP2001500207A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1954365A1 (de) * | 1969-10-29 | 1971-05-06 | Burgdorf Maerten Dr Ing | Verfahren zur Verminderung des Querschnittes von hohlen,insbesondere rohrfoermigen Werkstuecken |
US4872429A (en) * | 1987-12-14 | 1989-10-10 | Ford Motor Company | Method of making low friction finger follower rocker arms |
DE3929486A1 (de) * | 1988-09-12 | 1990-03-15 | Henley Mfg Co | Nockenstoessel-kipphebel |
US5048475A (en) * | 1991-01-17 | 1991-09-17 | Henley Manufacturing Holding Company, Inc. | Rocker arm |
Also Published As
Publication number | Publication date |
---|---|
DE19780946D2 (de) | 1999-05-27 |
KR20000036004A (ko) | 2000-06-26 |
JP2001500207A (ja) | 2001-01-09 |
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