GB1566047A - Hydraulic valve clearance compensating draulic valve clearance compensating device for internal combustion engines - Google Patents
Hydraulic valve clearance compensating draulic valve clearance compensating device for internal combustion engines Download PDFInfo
- Publication number
- GB1566047A GB1566047A GB4773677A GB4773677A GB1566047A GB 1566047 A GB1566047 A GB 1566047A GB 4773677 A GB4773677 A GB 4773677A GB 4773677 A GB4773677 A GB 4773677A GB 1566047 A GB1566047 A GB 1566047A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oil
- bore
- piston member
- disc
- valve
- 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.)
- Expired
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
- F01L1/20—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
- F01L1/2411—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the valve stem and rocker arm
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
(54) A HYDRAULIC VALVE CLEARANCE COMPENSATING
DEVICE FOR INTERNAL COMBUSTION ENGINES
(71) We, MOTOMAK, MOTORBNBAU, AtASCHINEN-UND W ERKZENGFABRLK. KON PRUKTIONBN, GmbH, a joint stock Company organised under the laws of Germany, of Inglostadt, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement ::
This invention relates to a hydraulic valve clearance compensating device for internal combustion engines, incorporated in a valve rocker and comprising an outer cylindrical member slidably guided in a bore in the valve rocker and within which is arranged for longitudinal sliding movement a piston member supported, at the end thereof which is remote from the valve clearance against a member closing the bore in the valve rocker, the piston member containing an oil supply chamber fed with oil via an oil feed passage leading from the shaft of the valve rocker and in communication via a non-return valve with a pressure chamber located between the piston member and the outer cylindrical member.
Valve clearance compensating devices of this kind are known. They have drawbacks in manufacture, fitting and operation, in some cases individually and in some cases also in combination. In many cases, the fitting of the valve clearance compensating device in the valve rocker involves manufacturing and fitting problems. The bore in the rocker accommodating the compensating device is frequently in the form of a blind bore against the end of which the compensating device is supported in operation. The machining of such blind bores is complicated and represents a considerable cost factor, in particular in the case of mass production.
It is also known to provide throughbores in the rockers, into which either the compensating device itself or separate retaining parts are screwed. The provision of screw threads and the possible need for supplementary retaining parts are likewise complicated as regards manufacture and fitting.
In those cases in which the compensating device is introduced into a blind bore, there is no possibility as a general rule of venting the air contained in the oil supplied to the compensating device, so that during operation air also reaches the pressure chamber of the valve clearance compensating device, thereby rendering it inoperative.
In the known valve clearance devices, the supply of the oil thereto requires extensive machining work, because on the one hand the walls of the two members guided one within the other, i.e. those of the piston member and the cylindrical member, must be provided with radial bores and, on the other hand, it is necessary to form in at least one of the tube members a circumferential groove, the axial width of which must match the relative longitudinal movement of the two members with respect to each other in order to ensure that sufficient oil will be introduced into the device in all operating positions.
The object of the invention is to provide a hydraulic valve clearance compensating device which is extremely simple in design as well as being simple and easy to fit in the rocker and which nevertheless does not have the operating drawbacks referred to above.
With this object in view, there is provided according to the present invention a hydraulic valve clearance compensating device for internal combustion engines incorporated in a valve rocker and comprising an outer cylindrical member slidably guided in a through bore in the valve rocker and within which is arranged for longitudinal sliding movement a piston member supported, at the end thereof which is remote from the valve clearance, against a member closing the bore in the valve rocker, the piston member containing an oil supply chamber fed with oil via an oil feed passage leading from the shaft of the valve rocker and in communication via a non-return valve with a pressure chamber located between the piston member and the cylindrical member, wherein the oil feed passage is arranged to discharge oil through an opening in the circumferential wall of the bore into that end portion of the bore which is closed by the bore closing member, the bore closing member is separated from the proximate end of the outer cylindrical member by an annular gap through which oil can directly reach the outer wall surface of the piston member and the piston member is formed at the end thereof which is supported against the bore closing member with orifices for the passage of oil from the annular gap into the oil supply chamber or cooperates with another member to permit such passage of oil.
In the simplest case, this is achieved in that the end of the piston member which is supported against the member closing the bore projects above the cylindrical member. The projecting end part of the piston member may then be provided with a radial bore or with a plurality of circumferentially distributed radial bores through which the oil can enter the oil supply chamber. Further supplementary bores in the cylindrical member and supplementary annular grooves are not necessary. No close tolerances of any kind have to be observed as regards the position of the radial bores in the said projecting end part of the piston member. On the contrary, it is merely necessary for some orifices leading into the oil supply chamber to be present in this region.
The bore accommodating the valve clearance compensating device can be formed in the valve rocker in a simple manner as a plain through bore which is closed at its end by an inserted disc against which the free end of the piston member bears. This disc may be fixed in the bore, for example, by means of a spring ring inserted in a peripheral groove, by swaging or by other retaining means.
Advantageously, the diameter of the disc is so chosen in relation to the diameter of the bore that its periphery forms with the bore a narrow annular gap through which air entrained in the flow of oil can escape to the outside. In contrast to the known compensating devices, a venting facility for the oil supply chamber is provided in this case in a very simple manner and without additional expenditure on machining work.
The disc closing the bore may have a plane bearing surface, in which case, to provide the orifices for the passage of oil into the oil supply chamber, the end of the piston member which is supported against the disc may be formed with a plurality of radial slots. These slots can be produced, for example, by a simple punching, stamping or embossing operation.
It is also possible, however, to save this additional slot-forming operation on the piston member by providing the end of the piston member which is supported against the disc with a planar surface and forming grooves for the passage of oil in the adjacent surface of the disc closing the bore. These grooves in the disc may be formed by a stamping operation. The stamping of such grooves in the disc does not represent any substantial manufacturing expenditure, because these discs can be punched out of sheet metal in simple manner and be provided with the necessary stamped grooves in a subsequent operation.
In a particular case, however, it may also prove to be appropriate not to make the end of the piston member which is adjacent the member closing the bore project beyond that of the cylindrical member, but, on the contrary, to make the said end of the cylindrical member project beyond that of the piston member. In this case, likewise, the advantages of the invention can be obtained by providing the disc closing the bore with a central projection against which the adjacent end of the piston member is supported. The design of this end of the piston member and of the bearing surface of the disc may be similar to that of the corresponding parts in the above-described embodiments.
Embodiments of the invention are illustrated in the accompanying drawings, in which: Figure 1 is a partial section through a rocker with an inserted valve clearance compensating device;
Figures 2, 3 and 5 are fragmentary sections through embodiments modified in comparison with Figure 1; and
Figure 4 is a plan view of a disc according to Figure 3.
The rocker 1 shown in Figure 1 has at its valve stem actuating end a bore 2 in which a valve clearance compensating device is inserted. This compensating device comprises an outer cylindrical member 3 which is slidably guided in the bore 2 and accommodates a piston member 4. The upper end of this piston member 4 projects above the upper end of the cylindrical member 3 and is supported at this end against a disc 5 fixed in the bore 2 by means of a spring ring 6.
The piston member 4 contains an oil supply chamber 7 which is closed at the bottom by a non-return ball valve 8. This non-return valve 8 separates the oil supply chamber 7 from a pressure chamber 9 which is defined on the one hand by the cylindrical member 3 and on the other hand by the piston member 4. The cylindrical member 3 acts on the valve stem 10 by means of its bottom face.
The oil feed to the valve clearance compensating device takes place via an oil passage 11 which starts in known manner from the rocker shaft and opens into the upper end part of the bore 2 in the region where the piston member 4 projects above the cylindrical member 3. In this region there is an annular gap between the upper end of the cylindrical member 3 and the disc 5 through which oil can directly reach the outer wall surface of the piston member 4 and the piston member 4 is provided with radial bores 12 through which the oil can enter the oil supply chamber 7.
The diameter of the disc 5 is so chosen in relation to the diameter of the bore 2 that a narrow annular gap (not shown) is left between them through which entrained air can escape to the outside.
The modified construction shown in Figure 2 differs from the construction according to Figure 1 solely in that the piston member 4 has in its upper end part a plurality of circumferentially distributed slots 13 through which the oil feed into the oil supply chamber 7 takes place.
In the modified construction shown in
Figure 3, these slots are dispensed with and the piston member 4 does not contain passages of any kind for the entry of oil.
Instead, grooves 14 are provided in the bottom surface of the disc 15 closing the bore 2, which grooves are arranged to cooperate with the upper end of the piston member 4. In this way, a particularly simple piston member 4 is obtained. Figure 4 shows in plan view a possible arrangement for the grooves 14 which may be formed by stamping in the bottom surface of the disc 15.
Finally, Figure 5 shows another modified construction in which the piston member 16 is made shorter than the cylindrical member 3 and the upper part of the piston member 16 is formed with a plurality of circumferentially distributed slots. In order nevertheless to provide the possibility of access for the oil fed through the bore 11, there is employed for supporting the compensating element a disc 17 having a central projection 18 against which the slotted upper end of the piston member 16 is supported.
WHAT WE CLAIM IS:- 1. A hydraulic valve clearance compensating device for internal combustion engines incorporated in a valve rocker and comprising an outer cylindrical member slidably guided in a through bore in the valve rocker and within which is arranged for longitudinal sliding movement a piston member supported at the end thereof which is remote from the valve clearance, against a member closing the bore in the valve rocker, the piston member containing an oil supply chamber fed with oil via an oil feed passage leading from the shaft of the valve rocker and in communication via a non-return valve with a pressure chamber located between the piston member and the outer cylindrical member, wherein the oil feed passage is arranged to discharge oil through an opening in the circumferential wall of the bore into that end portion of the bore which is closed by the bore closing member, the bore closing member is separated from the proximate end of the outer cylindrical member by an annular gap through which oil can directly reach the outer wall surface of the piston member and the piston member is formed at the end thereof which is supported against the bore closing member with orifices for the passage of oil from the annular gap into the oil supply chamber or cooperates with another member to permit such passage of oil.
2. A valve clearance compensating device according to claim 1, wherein the end of the piston member which is supported against the bore closing member projects above the outer cylindrical member.
3. A valve clearance compensating device according to claim 1 or 2, wherein the bore closing member consists of an inserted disc against which the free end of the piston member bears and a clearance is provided between the periphery of the disc and the wall surface of the bore to permit the escape of air entrained with the oil.
4. A valve clearance compensating device according to claim 3, wherein the disc has a plane bearing surface on the side thereof facing the piston member and the end of the piston member which is supported against the disc is provided with radial slots.
5. A valve clearance compensating device according to claim 3, wherein the end of the piston member which is supported against the disc has a planar surface and the adjacent surface of the disc has grooves for the passage of oil formed therein.
6. A valve clearance compensating device according to claim 5, wherein the grooves in the disc are formed therein by a stamping operation.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
1. A hydraulic valve clearance compensating device for internal combustion engines incorporated in a valve rocker and comprising an outer cylindrical member slidably guided in a through bore in the valve rocker and within which is arranged for longitudinal sliding movement a piston member supported at the end thereof which is remote from the valve clearance, against a member closing the bore in the valve rocker, the piston member containing an oil supply chamber fed with oil via an oil feed passage leading from the shaft of the valve rocker and in communication via a non-return valve with a pressure chamber located between the piston member and the outer cylindrical member, wherein the oil feed passage is arranged to discharge oil through an opening in the circumferential wall of the bore into that end portion of the bore which is closed by the bore closing member, the bore closing member is separated from the proximate end of the outer cylindrical member by an annular gap through which oil can directly reach the outer wall surface of the piston member and the piston member is formed at the end thereof which is supported against the bore closing member with orifices for the passage of oil from the annular gap into the oil supply chamber or cooperates with another member to permit such passage of oil.
2. A valve clearance compensating device according to claim 1, wherein the end of the piston member which is supported against the bore closing member projects above the outer cylindrical member.
3. A valve clearance compensating device according to claim 1 or 2, wherein the bore closing member consists of an inserted disc against which the free end of the piston member bears and a clearance is provided between the periphery of the disc and the wall surface of the bore to permit the escape of air entrained with the oil.
4. A valve clearance compensating device according to claim 3, wherein the disc has a plane bearing surface on the side thereof facing the piston member and the end of the piston member which is supported against the disc is provided with radial slots.
5. A valve clearance compensating device according to claim 3, wherein the end of the piston member which is supported against the disc has a planar surface and the adjacent surface of the disc has grooves for the passage of oil formed therein.
6. A valve clearance compensating device according to claim 5, wherein the grooves in the disc are formed therein by a stamping operation.
7. A valve clearance compensating de
vice according to claim 1, wherein the end of the outer cylindrical member adjacent the bore closing member projects beyond the corresponding end of the piston mem
ber and the bore closing member is pro
vided with a central projection against
which the adjacent end of the piston mem
ber is supported.
8. A valve clearance compensating device, substantially as described with reference to and as shown in Figure I or Figure 2 or Figures 3 and 4 or Figure 5 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762652154 DE2652154A1 (en) | 1976-11-16 | 1976-11-16 | HYDRAULIC BACKLASH ADJUSTMENT FOR COMBUSTION ENGINES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1566047A true GB1566047A (en) | 1980-04-30 |
Family
ID=5993272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4773677A Expired GB1566047A (en) | 1976-11-16 | 1977-11-16 | Hydraulic valve clearance compensating draulic valve clearance compensating device for internal combustion engines |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2652154A1 (en) |
| FR (1) | FR2370858A1 (en) |
| GB (1) | GB1566047A (en) |
| IT (1) | IT1087318B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6178946B1 (en) * | 1998-07-20 | 2001-01-30 | Jeff A. Matthews | Compression engine braking system |
| EP1213447A1 (en) * | 2000-12-06 | 2002-06-12 | Eaton Corporation | Hydraulic lash adjuster |
| CN105765182A (en) * | 2013-08-21 | 2016-07-13 | 日锻汽门株式会社 | Hydraulic lash adjuster |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4419977A (en) * | 1979-03-23 | 1983-12-13 | Eaton Corporation | Fuel injection system and timing advance device therefor |
| US4254749A (en) * | 1979-03-23 | 1981-03-10 | Eaton Corporation | Fuel injection system and timing advance device therefor |
| US4373477A (en) * | 1980-12-29 | 1983-02-15 | Eaton Corporation | Lash adjuster with plunger retainer |
| EP0375792B1 (en) * | 1982-03-29 | 1995-01-18 | Alfred Anthony Black | Adjustable valve spring retainer for internal combustion engine |
| DE3215766C2 (en) * | 1982-04-28 | 1984-06-07 | Daimler-Benz Ag, 7000 Stuttgart | Lubricating oil circuit for reciprocating internal combustion engines |
| DE3304398A1 (en) * | 1983-02-09 | 1984-08-09 | Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt | INTERNAL ELEMENT FOR A HYDRAULIC VALVE COMPENSATION COMPENSATING ELEMENT FOR COMBUSTION ENGINES |
| JPS6047806A (en) * | 1983-08-24 | 1985-03-15 | Aisin Seiki Co Ltd | Hydraulic lifter for internal-combustion engine |
| FR2566838B1 (en) * | 1984-07-02 | 1988-12-02 | Peugeot | DEVICE FOR CONTROLLING VALVES FOR SEALING INTAKE OR EXHAUST DUCTS IN AN INTERNAL COMBUSTION ENGINE |
| JPH029046Y2 (en) * | 1984-08-29 | 1990-03-06 | ||
| US4699094A (en) * | 1986-05-27 | 1987-10-13 | General Motors Corporation | Rocker arm and hydraulic lash adjuster with load/motion control button |
| DE3706006A1 (en) * | 1987-02-25 | 1988-09-08 | Schaeffler Waelzlager Kg | HYDRAULIC GAME COMPENSATION ELEMENT FOR VALVE CONTROLS ON COMBUSTION ENGINES |
| DE3708676A1 (en) * | 1987-03-17 | 1988-09-29 | Bayerische Motoren Werke Ag | Actuating lever for inlet and exhaust valves of internal combustion engines |
| DE19502497A1 (en) * | 1995-01-27 | 1996-08-01 | Schaeffler Waelzlager Kg | Hydraulic compensator for vehicle valve in IC engine |
| DE19502500A1 (en) * | 1995-01-27 | 1996-08-01 | Schaeffler Waelzlager Kg | Hydraulically working insert element for IC engine valve gear rocker lever |
| DE19515434A1 (en) * | 1995-04-27 | 1996-10-31 | Schaeffler Waelzlager Kg | Hydraulic lash adjuster |
| DE19610107A1 (en) * | 1996-03-15 | 1997-09-18 | Schaeffler Waelzlager Kg | Rocker arm or rocker arm with a valve lash adjuster |
| DE19629203B4 (en) * | 1996-07-19 | 2014-05-22 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic lash adjuster |
| DE19748162A1 (en) * | 1997-10-31 | 1999-05-06 | Audi Ag | Valve tappet with hydraulic valve clearance leveling element |
| DE102005059701A1 (en) * | 2005-12-14 | 2007-06-21 | Schaeffler Kg | Component of valve gear of internal combustion engine in particular guide for rocker arm, comprises support disk with raised outer surface |
| DE102008005768A1 (en) | 2008-01-24 | 2009-07-30 | Schaeffler Kg | Supporting element for valve impulse lever, such as tilting or rocker lever, is formed as hydraulic clearance compensation element for valve gear of internal-combustion engine |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2036936A (en) * | 1932-04-04 | 1936-04-07 | Halford Frank Bernard | Valve gear for internal combustion engines |
| FR767992A (en) * | 1933-11-25 | 1934-07-27 | Wilcox Rich Corp | Valve control mechanism |
| GB538952A (en) * | 1940-02-17 | 1941-08-22 | Eaton Mfg Co | Improvements in or relating to hydraulic means for automatically taking up clearance in valve-actuating tappets |
| US2874685A (en) * | 1955-08-26 | 1959-02-24 | Eaton Mfg Co | Hydraulic valve lifter |
| FR1178812A (en) * | 1957-07-12 | 1959-05-15 | Renault | Hydraulic backlash adjustment rocker arm for controlling engine valves |
| FR1191125A (en) * | 1958-02-05 | 1959-10-16 | Renault | Hydraulic device for taking up play for push-button controls or the like |
| US3170446A (en) * | 1963-08-07 | 1965-02-23 | Dolza John | Valve actuating mechanism |
| US3509858A (en) * | 1968-05-20 | 1970-05-05 | Gen Motors Corp | Overhead cam valve lifter |
| GB1254044A (en) * | 1968-05-25 | 1971-11-17 | Motomak | Hydraulically self-adjusting play-compensating element |
| FR2159798A5 (en) * | 1971-11-12 | 1973-06-22 | Johnson Products Inc |
-
1976
- 1976-11-16 DE DE19762652154 patent/DE2652154A1/en not_active Ceased
-
1977
- 1977-11-09 FR FR7733732A patent/FR2370858A1/en active Granted
- 1977-11-16 GB GB4773677A patent/GB1566047A/en not_active Expired
- 1977-11-16 IT IT2971377A patent/IT1087318B/en active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6178946B1 (en) * | 1998-07-20 | 2001-01-30 | Jeff A. Matthews | Compression engine braking system |
| EP1213447A1 (en) * | 2000-12-06 | 2002-06-12 | Eaton Corporation | Hydraulic lash adjuster |
| CN105765182A (en) * | 2013-08-21 | 2016-07-13 | 日锻汽门株式会社 | Hydraulic lash adjuster |
| US10301979B2 (en) | 2013-08-21 | 2019-05-28 | Nittan Valve Co., Ltd. | Hydraulic lash adjuster |
| CN105765182B (en) * | 2013-08-21 | 2019-12-03 | 日锻汽门株式会社 | Fluid pressure type clearance adjuster |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2652154A1 (en) | 1978-05-18 |
| FR2370858A1 (en) | 1978-06-09 |
| IT1087318B (en) | 1985-06-04 |
| FR2370858B1 (en) | 1984-05-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19971115 |