CN114523048A - Method for producing a rocker arm for a valve train and rocker arm for a valve train - Google Patents

Method for producing a rocker arm for a valve train and rocker arm for a valve train Download PDF

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Publication number
CN114523048A
CN114523048A CN202011319099.3A CN202011319099A CN114523048A CN 114523048 A CN114523048 A CN 114523048A CN 202011319099 A CN202011319099 A CN 202011319099A CN 114523048 A CN114523048 A CN 114523048A
Authority
CN
China
Prior art keywords
rocker arm
side walls
guide groove
valve train
blank
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.)
Pending
Application number
CN202011319099.3A
Other languages
Chinese (zh)
Inventor
高辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Holding China Co Ltd
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to CN202011319099.3A priority Critical patent/CN114523048A/en
Priority to DE102021123366.6A priority patent/DE102021123366A1/en
Publication of CN114523048A publication Critical patent/CN114523048A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/26—Perforating, i.e. punching holes in sheets or flat parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/006—Blanks having varying thickness, e.g. tailored blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/84—Making other particular articles other parts for engines, e.g. connecting-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
    • F01L1/181—Centre 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
    • F01L2301/00—Using particular materials
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The present invention relates to a method of manufacturing a rocker arm for a valve train and a rocker arm for a valve train. The rocker arm comprises a base plate and side walls (3) arranged opposite on both sides thereof, wherein the base plate forms a guide groove (1) at one longitudinal end of the rocker arm for engaging a valve push rod of a valve train, wherein the method comprises the following steps: s1) blanking out a sheet metal blank, wherein in regions (3 ') of the sheet metal blank in which side walls are to be formed, respective cutouts (31') are punched out; s2) folding the blank of sheet metal such that two regions (3 ') to be formed into side walls each form a side wall (3), wherein the cutouts (31') are arranged toward one another; s3) stamping the blank to form a guide groove (1), wherein the guide groove (1) and the sections of the two side walls (3) which are each provided with a recess (31') substantially form a W shape. The rocker arm is manufactured by the method described above.

Description

Method for producing a rocker arm for a valve train and rocker arm for a valve train
Technical Field
The invention relates to the technical field of vehicles. The invention relates in particular to a method of manufacturing a rocker arm for a valve train and to the rocker arm itself for a valve train.
Background
Valve trains are usually provided in the internal combustion engines of modern vehicles. Rocker arms of the valve train serve to convert the rotary motion of the cams at the camshaft into a linear motion that drives the valve push rods. At present, rocker arms, particularly roller rocker arms, are often manufactured by press forming a steel plate.
For example, chinese patent application CN 109944654 a discloses a roller rocker arm. In this solution, the body of the roller rocker arm is constructed from a stamped steel plate. The body of the rocker arm is here substantially U-shaped in cross section, comprising a base plate and two side walls. The cam on the camshaft is in contact with a roller in the longitudinal center region of the valve rocker, wherein the roller is rotatably mounted on the two side walls. The valve rocker arm is formed at its longitudinal ends with a tappet seat for contacting a tappet of a valve train and a tappet seat for contacting a valve tappet of the valve train, wherein a guide groove is provided at the tappet seat. In this case, the guide groove and the side wall of the rocker arm body substantially constitute a W shape in cross section.
However, it has been found that in roller rocker arms of the above-mentioned type, the rocker arm body, in particular at its W-shaped configuration, is susceptible to damage.
Disclosure of Invention
It is therefore an object of the present invention to provide a method of manufacturing a rocker arm for a valve train and a rocker arm for a valve train, which rocker arm should have a long service life.
The above object is achieved by a method of manufacturing a rocker arm for a valve train. The rocker arm mentioned comprises a bottom plate and side walls arranged opposite on both sides thereof, wherein the bottom plate forms a guide groove for engaging a valve push rod of the valve mechanism at one longitudinal end of the rocker arm.
Here, the rocker arm preferably comprises a body made of a plate, in particular a steel plate. The main body of the rocker arm comprises a base plate and two side walls, wherein the base plate and the two side walls enclose a U-shaped structure extending substantially in the longitudinal direction of the rocker arm. Advantageously, the two side walls of the rocker arm extend from the two sides of the base plate in a direction perpendicular to the plane of extension of the base plate. Advantageously and alternatively, the two side walls of the rocker arm extend preferably symmetrically from both sides of the base plate in a direction inclined to the plane of extension of the base plate. However, it should be noted that the extending directions of the bottom plate and the side wall in the respective local areas are not limited herein, that is, the bottom plate and the side wall may have a local bending structure.
In this case, the rocker is particularly preferably designed as a roller rocker. In this case, the rocker arm also comprises a roller, preferably in the form of a roller. The rollers are rotatably supported on the main body of the rocker arm, in particular on both side walls of the main body. The axis of rotation of the roller is here perpendicular to the longitudinal direction of the rocker arm. After mounting the rocker arm in the valve train, the cam at the camshaft can abut against the roller.
In this case, it is particularly preferred that the body of the rocker arm, in particular the base plate, forms a tappet seat at one longitudinal end for contacting a tappet of a valve train. The tappet seat is, for example, dome-shaped.
In this case, it is particularly preferred that the body of the rocker arm, in particular the base plate, forms a tappet seat at the other longitudinal end for contacting a valve tappet of a valve train, wherein a guide groove is provided at the tappet seat.
The manufacturing method provided by the invention comprises the following steps:
s1) blanking out a sheet metal blank, wherein a recess is respectively stamped out in the region of the sheet metal blank in which the side wall is to be formed;
s2) folding the sheet blank such that the two regions in which the side walls are to be formed each form a side wall of the rocker arm, wherein the cutouts in the two side walls are arranged toward one another;
s3) punching the plate blank to form a guide groove, wherein the guide groove and a section of the two side walls of the rocker arm, each provided with a clearance, substantially form a W-shape.
The recess is preferably configured as a recess recessed from the plate surface of the plate blank. In this case, the plate thickness of the sheet metal part at the recess is smaller than the plate thickness of the remaining part thereof in the region of the side wall to be formed. In this way, when the side walls of the rocker arm extending toward one another are formed by bending the sheet metal blank, thin-walled regions of the side walls are formed by the cutouts. Thus, after the guide groove is formed by stamping, the distance between the side wall of the guide groove extending along the longitudinal direction and the two side walls of the rocker arm is larger due to the arrangement of the hollow part. In this case, the stresses are lower than in the known solutions, in particular at the connection of the side walls of the guide groove and the thin-walled regions of the respective side walls of the rocker arm, thereby contributing to an improvement in the fatigue strength of the rocker arm body.
In addition, since the provision of the clearance in the region of the side wall to be formed eliminates the need to increase the total width of the rocker arm, i.e. the distance between the side wall surfaces of the two side walls of the rocker arm that face away from each other, in order to increase the distance between the side wall of the guide groove and the respective side wall of the rocker arm. Likewise, there is no need to reduce the inner width of the guide groove for this purpose. Therefore, the scheme of the invention can be suitable for more application schemes, the structural design of the existing valve mechanism is slightly changed, and the additional design cost can be saved.
Furthermore, since the recess is provided in the region of the side wall to be formed, the strength in the region of the blank to be formed with the guide groove is not affected, and therefore the manufacturing process, in particular the stamping process in step S3), is not adversely affected. The strength of the guide groove is not reduced accordingly, and therefore the engagement of the guide groove with the valve tappet during operation is not adversely affected.
In a preferred embodiment, the plate thickness of the sheet-blank piece at the clearance is 50% to 75% of the plate thickness at the rest of the area where the side wall is to be formed, this preferred arrangement taking into account the advantages in terms of fatigue strength and space size. It has been found that a recess configured in this way advantageously reduces stresses, in particular at the connection of the side walls of the guide groove and the corresponding side walls of the rocker arm.
Particularly preferably, the plate thickness of the plate blank at the recess is 60% of the plate thickness at the rest of the region in which the side wall is to be formed. It has been found that a recess configured in this way advantageously reduces stresses, in particular at the connection of the side walls of the guide groove and the corresponding side walls of the rocker arm.
In a preferred embodiment, the longitudinal extent of the recess matches the longitudinal extent of the guide groove. Thus, the gap formed by the side wall of the guide groove and the two side walls of the rocker arm is always larger in the entire longitudinal extension of the guide groove, so that the stress at the connecting portion of the side wall of the guide groove and the corresponding side wall of the rocker arm is always smaller, which is beneficial to improving the fatigue strength of the rocker arm.
The above object is also achieved by a rocker arm for a valve train, which rocker arm is manufactured by a method according to the above embodiment.
Drawings
Preferred embodiments of the present invention are schematically illustrated in the following with reference to the accompanying drawings. The attached drawings are as follows:
FIG. 1 is a perspective view of a main body of a rocker arm according to a preferred embodiment;
FIG. 2 is a longitudinal cross-sectional view of the body of the rocker arm according to FIG. 1;
FIG. 3 is a side view of the body of the rocker arm according to FIG. 1; and
fig. 4 is a blank of plate punched out during the manufacture of the rocker arm according to fig. 1.
Detailed Description
FIG. 1 illustrates a perspective view of a main body of a rocker arm according to a preferred embodiment. The rocker arm is configured in the present embodiment as a roller rocker arm. The rocker arm here comprises, in addition to the body shown in fig. 1, a roller (not shown), for example in the form of a roller. After mounting the rocker arm in the valve train, the cam at the camshaft can abut against the roller.
As shown in fig. 1, the main body of the rocker arm is made of a steel plate. The body of the rocker arm here comprises a bottom plate and two side walls 3. The bottom plate and the two side walls 3 enclose a U-shaped structure extending substantially in the longitudinal direction of the rocker arm. In the present embodiment, the two side walls 3 of the rocker arm extend parallel to each other. Through holes are formed in both side walls 3, in which through holes the rollers of the rocker arm can be rotatably mounted by means of shafts or pins in the two side walls 3.
Fig. 2 shows a longitudinal section through the body of the rocker arm according to fig. 1. As can be seen in connection with fig. 1 and 2, the body of the rocker arm forms a tappet seat 2 at one longitudinal end of the base plate for contact with a tappet of a valve mechanism. The tappet seat 2 is configured as a dome portion in the present embodiment. The main body of the rocker arm forms a pushrod seat for contact with a valve pushrod of a valve train at the other longitudinal end of the base plate.
Fig. 3 shows a side view of the body of the rocker arm according to fig. 1 on the side of the tappet seat. As can be seen in fig. 1 and 3, a guide groove 1 is provided at the plunger seat. The two side walls 3 of the rocker arm and the guide groove 1 form a W-shape in the side view shown in fig. 3 and in the corresponding cross section.
The rocker arms shown here can be produced, for example, by a method for producing rocker arms according to a preferred embodiment. The manufacturing method comprises the steps of:
s1) blanking out a plate blank. Fig. 4 shows the blank sheet punched out in step S1). As shown in fig. 4, a recess 31 'is punched out in each case in the region 3' of the plate blank in which the side wall is to be formed. The vacant part 31' is configured as a concave part recessed from the plate surface of the plate blank. In the present embodiment, the plate thickness of the plate blank at the clearance 31 'is 50% to 75%, particularly preferably 60%, of the plate thickness at the remaining part of the region 3' where the side wall is to be formed.
S2) folding the blank so that the two regions 3' to be formed into side walls each form a side wall 3 of the rocker arm. The recesses 31' in the two side walls 3 are arranged facing one another. Thin-walled regions 31 in the two side walls 3 are thereby formed by the recesses 31'.
S3) punching the plate blank to form the guide groove 1. The guide groove 1 and the sections or thin sections 31 of the two side walls 3 of the rocker arm, which are each provided with a recess 31', are substantially W-shaped.
It is conceivable that the manufacturing method of the rocker arm comprises the other necessary steps: such as the profiling of the roller pockets, the pressing of the dome-shaped tappet housing 2 and the configuration of the through-hole in the side wall 3.
With the rocker arm and the method of manufacturing the rocker arm provided according to the present embodiment, the distance between the longitudinally extending side wall of the guide groove 1 and the thin-walled regions 31 of the two side walls 3 of the rocker arm is larger due to the provision of the clearance 31', and therefore the stress at the connection of the side wall of the guide groove 1 and the thin-walled regions 31 of the respective side walls 3 of the rocker arm is smaller than in the known solutions, thereby contributing to an improvement in the fatigue strength of the body of the rocker arm. In addition, there is no need to increase the total width W of the rocker arm in order to increase the distance between the side wall of the guide groove 1 and the corresponding side wall 3 of the rocker arm1(see FIG. 3) and/or reducing the inner width W of the guide groove 12(see FIG. 3). Therefore, the scheme of the invention can be suitable for more application schemes, the structural design of the existing valve mechanism is slightly changed, and the additional design cost can be saved. Furthermore, since the recess 31 ' is provided only in the region 3 ' where the side wall is to be formed, the strength in the region 1 ' of the blank to be formed with the guide groove is not affected, and therefore, the blank is not aligned with the guide grooveThe press process in step S3) causes adverse effects. The strength of the guide groove 1 is also not reduced accordingly, so that the engagement of the guide groove 1 with the valve tappet during operation is not adversely affected.
Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.
List of reference numerals
1 guide groove
2 dome part
3 side wall
31 thin wall region of side wall
1' region of guide groove to be formed
3' region of sidewall to be formed
31' hollow part
W1Total width of rocker arm
W2Inner width of guide groove

Claims (5)

1. A method of manufacturing a rocker arm for a valve train, the rocker arm comprising a base plate and side walls (3) arranged opposite on both sides thereof, wherein the base plate forms a guide groove (1) at one longitudinal end of the rocker arm for engaging a valve push rod of the valve train,
characterized in that the method comprises the following steps:
s1) blanking out a plate blank, wherein in regions (3 ') of the plate blank in which the side walls are to be formed, respective cutouts (31') are punched out;
s2) bending the panel blank such that two regions (3 ') to be formed into the side walls each form the side wall (3), wherein the cutouts (31') are arranged toward one another;
s3) pressing the sheet metal blank to form the guide groove (1), wherein the guide groove (1) and the sections of the two side walls (3) which are each provided with the recess (31') substantially form a W shape.
2. The method of claim 1,
the plate thickness of the plate blank at the clearance (31 ') is 50% to 75% of the plate thickness at the remaining part of the region (3') where the side wall is to be formed.
3. The method of claim 2,
the plate thickness of the plate blank at the clearance (31 ') is 60% of the plate thickness at the remaining part of the area (3') where the side wall is to be formed.
4. The method according to any one of claims 1 to 3,
the longitudinal extent of the recess (31') is adapted to the longitudinal extent of the guide groove (1).
5. A rocker arm for a valve train, the rocker arm being manufactured by a method according to any one of claims 1 to 4.
CN202011319099.3A 2020-11-23 2020-11-23 Method for producing a rocker arm for a valve train and rocker arm for a valve train Pending CN114523048A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202011319099.3A CN114523048A (en) 2020-11-23 2020-11-23 Method for producing a rocker arm for a valve train and rocker arm for a valve train
DE102021123366.6A DE102021123366A1 (en) 2020-11-23 2021-09-09 Method of manufacturing a rocker arm for a valve train and rocker arm for a valve train

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011319099.3A CN114523048A (en) 2020-11-23 2020-11-23 Method for producing a rocker arm for a valve train and rocker arm for a valve train

Publications (1)

Publication Number Publication Date
CN114523048A true CN114523048A (en) 2022-05-24

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Application Number Title Priority Date Filing Date
CN202011319099.3A Pending CN114523048A (en) 2020-11-23 2020-11-23 Method for producing a rocker arm for a valve train and rocker arm for a valve train

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CN (1) CN114523048A (en)
DE (1) DE102021123366A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109944654A (en) 2018-12-25 2019-06-28 舍弗勒技术股份两合公司 Valve rocker arm, internal combustion engine and method for manufacturing valve rocker arm

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DE102021123366A1 (en) 2022-05-25

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Effective date of registration: 20240320

Address after: 1st Floor, Building 2, No. 1 Antuo Road, Anting Town, Jiading District, Shanghai

Applicant after: SCHAEFFLER HOLDING(CHINA) Co.,Ltd.

Country or region after: China

Address before: German Herzogenaurach

Applicant before: SCHAEFFLER TECHNOLOGIES AG & CO.KG

Country or region before: Germany