GB2156471A - A cup-shaped casing for a self-adjusting hydraulic tappet for overhead camshaft internal combustion engines and a method of producing the casing - Google Patents

A cup-shaped casing for a self-adjusting hydraulic tappet for overhead camshaft internal combustion engines and a method of producing the casing Download PDF

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Publication number
GB2156471A
GB2156471A GB08508504A GB8508504A GB2156471A GB 2156471 A GB2156471 A GB 2156471A GB 08508504 A GB08508504 A GB 08508504A GB 8508504 A GB8508504 A GB 8508504A GB 2156471 A GB2156471 A GB 2156471A
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GB
United Kingdom
Prior art keywords
bore
casing
outer part
flange part
wall
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
Application number
GB08508504A
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GB2156471B (en
GB8508504D0 (en
Inventor
Walter Speil
Horst Doppling
Franz Gotz
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MOTOMAK
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MOTOMAK
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 MOTOMAK filed Critical MOTOMAK
Publication of GB8508504D0 publication Critical patent/GB8508504D0/en
Publication of GB2156471A publication Critical patent/GB2156471A/en
Application granted granted Critical
Publication of GB2156471B publication Critical patent/GB2156471B/en
Expired legal-status Critical Current

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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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem

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

Abstract

A cup-shaped casing for a self- adjusting hydraulic tappet for an overhead camshaft internal combustion engine comprises a hollow cylindrical outer part (1) closed at one end by an end wall (2) and, disposed concentrically in the outlet part (1), a hollow cylindrical inner part (3) connected in fluid-tight relationship at one end to the bore in the outer part (1) by means of an annular, flat or funnel- shaped, flange part (4). The actual play-compensating assembly (5) is slidably guided in the hollow cylindrical inner part (3). To secure the flange part (4) the latter bears, by way of the end face of its edge facing the end wall (2), against a shoulder (6) in the bore in the outer part (1). A bead (8) bounding a peripheral groove (7) in the outer surface of the outer part (1) is roll- formed to bear against the other end face of edge of the flange part (4). <IMAGE>

Description

SPECIFICATION A cup-shaped casing for a self-adjusting hydraulic tappet for overhead camshaft internal combustion engines and a method of producing the casing The invention relates to a cup-shaped casing for a selfadjusting hydraulic tappet for overhead-camshaft internal combustion engines, the casing comprising a hollow cylindrical outer part closed at one end by an end wall and, disposed concentrically in the outer part, a hollow cylindrical inner part for guiding a play-compensating element, the inner part being connected in fluid-tight relationship at one end to the bore in the outer part by way of an annular, for example funnel-shaped, flange part, in the hollow cylindrical inner part. The invention also relates to a method of producing such a casing.
Various methods have been tried in the production of known casings of this kind. One method has been to connect the flange part, once it has been placed in the bore in the casing, by way of its outer edge to the casing bore wall by soldering or welding. This method results in the risk of cracks and fractures occurring in the soldered or welded joints as a result of vibrations in service, leading in the extreme case to destruction of the tappet.
Another method has been to secure the flanges positively in the cup-shaped casing bore wall by applying the flange part against a step or shoulder of the bore wall and displacing material from the inner wall of the bore chiplessly on the opposite side of the flange, such material bearing against the guide part.
In all cases the outer surface of the side wall of the cup-shaped casing must also be formed with a peripheral groove for supplying oil to the tappet interior. Forming this peripheral groove requires an additional working step.
It is the object of the invention, using very few working steps, to provide a satisfactory fluid-tight connection of the flange part in the casing bore and to form the required peripheral groove in the casing outer surface.
According to the invention, the flange part bears, by way of the face of its edge facing the end wall, against a shoulder in the bore in the outer part, while a bead bounding a periphcral groove in the outer surface of the outer part bears against the othcr end face of the edge of the flange. Thus, a bead which also bounds the peripheral groove in the outer surface serves to secure the flange part in the direction remote from the end wall.
To produce such a cup-shaped casing in accordance with the invention, after the flange part has been introduced into the bore of the outer part and bears against the step-shaped shoulder in the originally plain cylindrical wall of the outer part, a peripheral groove is formed by a chipless deformation, advantaye- ously by roll forming in the outer surface. a bead thereby being formed in the bore wall of the outer part and bearing sealingly against the flange part.The joint between these parts can additionally be sealed by soldering o welding to achieve complete fluid-tightn"s between the flange part and the outer pa t The invention will now be further descr bed by way of example with reference to the drawings in which the two figures show In longitudinal two stages in the formation of a valve tappet.
The self-adjusting hydraulic valve tappet shown in the drawings comprises a hollow cylindrical outer part 1 closed at one end by an end wall 2. An inner part 3 is disposed in the outer part 1 concentrically thereto and has, at its end remote from the end wall 2, a flange part 4 by which it is connected in fluidtight relationship to the side wall of the bore in the outer part 1. The actual play-compensating element 5 is slidably guided for longitudinal movement in the hollow cylindrical inner part 3.
Referring to Figure 1, as a first step, the inner part 3 with the flange part 4 is so introduced into the outer part 1 as to bear on a step-shaped shoulder 6 in the side wall of the bore in the outer part 1. Figure 2 shows how a bead 8 forms in the side wall of the bore as a result of the next step which consists in forming a peripheral groove 7 in the outer side wall of the outer part 2, for instance by roll forming. The bead 8 bears sealingly against the flange part 4 and thus locates the same positively relatively to the outer part 1.
For the sake of complete fluid-tightness between the outer part 1 and the flange part 4, the joint between them can additionally be sealed, in a manner which is not shown, by soldering or welding.
In this construction an annular oil reservoir 9 is supplied with oil from the peripheral groove 7 by way of at least one longitudinal groove 10 which extends from the peripheral groove 7 to the region of the reservoir 9 and from which a through-bore 11 extends into the reservoir 9.
The annular flange part 4 can be flat and on the lower end of the hollow cylindrical sleeve part 3, as shown in Figures 1 and 2 In a modified construction however it can be frusto-conical or funnel-shaped, as indicated by chain-lines and reference 1 2 on the lefthand side of Figure 2 and merge with the upper end of the hollow cylindrical sleeve.
1. A cup-shaped casing for a self-adjusting hydraulic tappet for an overhead-camshaft internal combustion engine, the casing comprising a hollow cylindrical outer part closed at
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A cup-shaped casing for a self-adjusting hydraulic tappet for overhead camshaft internal combustion engines and a method of producing the casing The invention relates to a cup-shaped casing for a selfadjusting hydraulic tappet for overhead-camshaft internal combustion engines, the casing comprising a hollow cylindrical outer part closed at one end by an end wall and, disposed concentrically in the outer part, a hollow cylindrical inner part for guiding a play-compensating element, the inner part being connected in fluid-tight relationship at one end to the bore in the outer part by way of an annular, for example funnel-shaped, flange part, in the hollow cylindrical inner part. The invention also relates to a method of producing such a casing. Various methods have been tried in the production of known casings of this kind. One method has been to connect the flange part, once it has been placed in the bore in the casing, by way of its outer edge to the casing bore wall by soldering or welding. This method results in the risk of cracks and fractures occurring in the soldered or welded joints as a result of vibrations in service, leading in the extreme case to destruction of the tappet. Another method has been to secure the flanges positively in the cup-shaped casing bore wall by applying the flange part against a step or shoulder of the bore wall and displacing material from the inner wall of the bore chiplessly on the opposite side of the flange, such material bearing against the guide part. In all cases the outer surface of the side wall of the cup-shaped casing must also be formed with a peripheral groove for supplying oil to the tappet interior. Forming this peripheral groove requires an additional working step. It is the object of the invention, using very few working steps, to provide a satisfactory fluid-tight connection of the flange part in the casing bore and to form the required peripheral groove in the casing outer surface. According to the invention, the flange part bears, by way of the face of its edge facing the end wall, against a shoulder in the bore in the outer part, while a bead bounding a periphcral groove in the outer surface of the outer part bears against the othcr end face of the edge of the flange. Thus, a bead which also bounds the peripheral groove in the outer surface serves to secure the flange part in the direction remote from the end wall. To produce such a cup-shaped casing in accordance with the invention, after the flange part has been introduced into the bore of the outer part and bears against the step-shaped shoulder in the originally plain cylindrical wall of the outer part, a peripheral groove is formed by a chipless deformation, advantaye- ously by roll forming in the outer surface. a bead thereby being formed in the bore wall of the outer part and bearing sealingly against the flange part.The joint between these parts can additionally be sealed by soldering o welding to achieve complete fluid-tightn"s between the flange part and the outer pa t The invention will now be further descr bed by way of example with reference to the drawings in which the two figures show In longitudinal two stages in the formation of a valve tappet. The self-adjusting hydraulic valve tappet shown in the drawings comprises a hollow cylindrical outer part 1 closed at one end by an end wall 2. An inner part 3 is disposed in the outer part 1 concentrically thereto and has, at its end remote from the end wall 2, a flange part 4 by which it is connected in fluidtight relationship to the side wall of the bore in the outer part 1. The actual play-compensating element 5 is slidably guided for longitudinal movement in the hollow cylindrical inner part 3. Referring to Figure 1, as a first step, the inner part 3 with the flange part 4 is so introduced into the outer part 1 as to bear on a step-shaped shoulder 6 in the side wall of the bore in the outer part 1. Figure 2 shows how a bead 8 forms in the side wall of the bore as a result of the next step which consists in forming a peripheral groove 7 in the outer side wall of the outer part 2, for instance by roll forming. The bead 8 bears sealingly against the flange part 4 and thus locates the same positively relatively to the outer part 1. For the sake of complete fluid-tightness between the outer part 1 and the flange part 4, the joint between them can additionally be sealed, in a manner which is not shown, by soldering or welding. In this construction an annular oil reservoir 9 is supplied with oil from the peripheral groove 7 by way of at least one longitudinal groove 10 which extends from the peripheral groove 7 to the region of the reservoir 9 and from which a through-bore 11 extends into the reservoir 9. The annular flange part 4 can be flat and on the lower end of the hollow cylindrical sleeve part 3, as shown in Figures 1 and 2 In a modified construction however it can be frusto-conical or funnel-shaped, as indicated by chain-lines and reference 1 2 on the lefthand side of Figure 2 and merge with the upper end of the hollow cylindrical sleeve. CLAIMS
1. A cup-shaped casing for a self-adjusting hydraulic tappet for an overhead-camshaft internal combustion engine, the casing comprising a hollow cylindrical outer part closed at one end by an end wall and, disposed concentrically in the outer part, a hollow cylindrical inner part for guiding a play-compensating element, the inner part being connected in fluid-tight relationship at one end to the bore in the outer part by way of an annular flange part, characterised in that the flange part bears, by way of the end face of its edge facing the end wall, against a shoulder in the bore in the outer part, while a bead bounding a peripheral groove in the outer surface of the outer part bears against the other end face of the edge of the flange part.
2. A cup-shaped casing for a self-adjusting hydraulic tappet substantially as described with reference to the drawings.
3. A method of producing a cup-shaped casing according to claim 1 or 2, characterised in that after the flange part has been introduced into the bore of the outer part to bear against the shoulder in the cylindrical wall of the outer part, a peripheral groove is formed in the outer surface of the cylindrical wall by chipless deformation and a bead is thereby formed in the side wall of the bore and bears sealingly against the flange part.
4. A method according to claim 3, wherein the peripheral groove and the bead are formed by roll-forming.
GB08508504A 1984-03-31 1985-04-01 A cup-shaped casing for a self-adjusting hydraulic tappet for overhead camshaft internal combustion engines and a method of producing the casing Expired GB2156471B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843412176 DE3412176A1 (en) 1984-03-31 1984-03-31 CUP-SHAPED HOUSING OF A SELF-ACTUATING HYDRAULICALLY ADJUSTING VALVE TOLDER FOR INTERNAL COMBUSTION ENGINES WITH OVERHEAD CAMSHAFT AND METHOD FOR THE PRODUCTION THEREOF

Publications (3)

Publication Number Publication Date
GB8508504D0 GB8508504D0 (en) 1985-05-09
GB2156471A true GB2156471A (en) 1985-10-09
GB2156471B GB2156471B (en) 1987-07-29

Family

ID=6232327

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08508504A Expired GB2156471B (en) 1984-03-31 1985-04-01 A cup-shaped casing for a self-adjusting hydraulic tappet for overhead camshaft internal combustion engines and a method of producing the casing

Country Status (5)

Country Link
JP (1) JPS60224907A (en)
BR (1) BR8501452A (en)
DE (1) DE3412176A1 (en)
GB (1) GB2156471B (en)
IT (1) IT1184343B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0266685A1 (en) * 1986-11-06 1988-05-11 INA Wälzlager Schaeffler KG Self-adjusting hydraulic valve tappet

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01313561A (en) * 1988-06-13 1989-12-19 Mitsui Toatsu Chem Inc Aromatic polyether-imide resin composition
DE4325610A1 (en) * 1993-07-30 1995-02-02 Schaeffler Waelzlager Kg Cup-shaped valve lifter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2941084A1 (en) * 1979-10-10 1981-04-23 Fritz Gotthold 6453 Seligenstadt Rottluff Hydraulic tappet with hydrodynamic venting - has sleeve with control passage and valve seat venting and sealing chambers
US4367701A (en) * 1979-12-05 1983-01-11 Eaton Corporation Acting valve gear

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0266685A1 (en) * 1986-11-06 1988-05-11 INA Wälzlager Schaeffler KG Self-adjusting hydraulic valve tappet

Also Published As

Publication number Publication date
JPH0544526B2 (en) 1993-07-06
BR8501452A (en) 1985-11-26
DE3412176A1 (en) 1985-10-10
DE3412176C2 (en) 1991-07-25
GB2156471B (en) 1987-07-29
GB8508504D0 (en) 1985-05-09
JPS60224907A (en) 1985-11-09
IT8519684A0 (en) 1985-02-27
IT1184343B (en) 1987-10-28

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940401