DE3300032A1 - Roller tappet for a valve drive of a reciprocating piston internal combustion engine - Google Patents

Abstract

Roller tappet (1) for a valve drive of a reciprocating piston internal combustion engine, comprising a cylindrical plunger (2) and a roller (3) supported in a forked extension (8) by means of a pin (9). The return oil from the valve drive is led off by way of discharge apertures (13) in the forked extension (8), so that the return oil cannot lead either to the build-up of an excessive film of oil or to deposits of dirt particles on the surface of the roller (3). In addition the forked extension (8) has lunate oil pockets (10) for the reliable supply of lubricating oil to the roller bearing and to the end stop faces (15) of the roller (3) (Fig. 1). <IMAGE>

Description

. Klöcknor-Humboldt-Deuiz AG. Λλ fcr "& a, Sä SP.aA '

~ "5000 Cologne 80, December 21, 1982

Our reference: D 82/45 AE-ZPB Ca / Bi

• 3

Roller tappet for a valve train of a reciprocating piston combustion

engine

The invention relates to a roller tappet for a valve train of a reciprocating internal combustion engine, consisting of ■ ... "" from a in the housing of the reciprocating internal combustion engine ^; . displaceably mounted, cylindrical plunger that is attached to. 05 its upper end face a ball socket for receiving; "" of the shaft end of a valve drive driving and with

Comprising pressure oil-supplying push rod, wherein, the \ ball socket opposite, in a fork-shaped; -> -, - "'■ extension of the plunger a roller mounted on a bolt under;" 10 lubricant supply is arranged, which runs on ί £ ν "a cam, and the return oil from the ''% -_ ■' \ Valve drive along the outside of the push rod and through '■ -'- \ drainage openings in the plunger. Ρ? -.: · """■" - ■ ·

7 '\ * 15 In the case of a known roller tappet, the one in the generic term of ; -> v --- Y claim 1 listed genus is the return oil from the \ v '. *! / Valve train discharged via the plunger in such a way that it

Klöckner-Humboldl-Deutz AG Ζ ^ δ ^ ΕΓΰΕ ^ ν? v> U U U O ^

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D 82/45

flows onto the roll. This causes the dirt particles in the return oil to get onto the running surface of the roller and lead to the destruction of the running surfaces of the roller and of the cam of the camshaft that interacts with it. By the constant supply of large amounts of oil to the running surface of the roller is formed at the contact surface. of roller and Cam a thick film of oil that prevents the roller from slipping on the cam and thus interferes with the operation of the Roller tappet has the consequence. In addition, the roller is mounted on the bolt by means of lubricant bores and bushing having lubrication belts that allow lubricant to be supplied through bores in the plunger and in the Has bolts, very expensive. Another disadvantage is in it too. recognize · that the role at the fork-shaped extensions of the plunger starts up, creating a braking effect exercised on the role.

The object on which the invention is based is thus to remedy the deficiencies described above and thus to create a roller tappet with a simple structure and cheaper 'storage of the role, the. Roller wear should be kept as low as possible.

This task is carried out on a roller tappet of the type in question by the characterizing part of claim 1 listed features solved. .

The arrangement of the drainage openings in the fork-shaped Extensions of the plunger ensure that contaminated lubricating oil is no longer on the running surface of the

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Klöckner-Humbc'dl-Deutz AG ΔΑ IaNSi. a- ω ι: - * & *

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D 82/45

Role arrived. The roller is mounted on the bolt via the sickle-shaped oil pockets with small contact surfaces and a small friction radius is easily supplied with lubricating oil, while at the same time between the end faces Contact surfaces of the role and the fork-shaped extensions a lubricating film is applied so that the braking effect can be kept very small in this area can. Since there is only a small oil film on the running surface of the roller, applied by the in the crankcase of the Internal combustion engine oil mist, is present, and ' between the fork-shaped extension and the role only If there is a slight braking effect, slippage can occur the role on the cam can be avoided.

In a further embodiment of the invention it is proposed that the sickle-shaped recesses on the pressurized oil circulation system to connect the internal combustion engine. In this way it is ensured that no contaminated Lubricating oil gets into the bearing and the start-up of the roller. It can be a between the roller and the bolt self-priming storage can be provided, for example in the form of a roller bearing or a plain bearing. To the Creating a self-priming storage there is also the possibility of the roller on the bolt with a To store game, which as a result of the mechanical pressure loads and reliefs in the storage has a pumping effect brings about.

To further explain the invention, reference is made to the drawing, in which an exemplary embodiment is shown in a simplified manner.
Show it:

Klückner-Humboldi-Deufz AG

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D 82/45

Fig. 1 is a longitudinal section through an inventive Roller tappet and

2 shows a longitudinal section along line II-II through the Roller tappet according to FIG. 1.

In Figures 1 and 2, 1 denotes a roller tappet, which consists of a cylindrical plunger 2 and a roller 3. The plunger 2 is in a sleeve 4 slidably mounted in the only indicated housing of the Reciprocating internal combustion engine is attached. The plunger 2 has on its upper end face a ball socket 5 which is used for receiving the shaft end of a not shown

l -

The push rod is used, also not shown Drives the valve train of the reciprocating internal combustion engine. These The push rod also supplies the valve train at the same time Lubricating oil and for this purpose the plunger 2 has a radial bore 6, which is connected to a central bore 7 in the ball " pan 5 is connected. Furthermore, the plunger 2 has two fork-shaped extensions 8 in the lower region, in; which a bolt 9 is attached. Again on the bolt the roller 3 is rotatably mounted. In the fork-shaped extension 8 are above the bolt 9 and on both sides of • the end-face contact surfaces 15 of the roller 3 sickle-shaped arranged oil pockets 10, each with an oil channel 11

stay in contact. Both the oil channel 11 and the . radial bore 6 are cycled during the upward and downward movement of the plungers with one in the sleeve ■ 4 provided annular lubricating oil channel ·

. ' . ■ ■ "■■■ ·

Klöckner-HLimboldt-Deuiz AG

r \ f \ η r \ r \ -λ 's JO UUUOZ

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D 82/45

. ■ _ '■ -' ■■ 16 "in connection 2 also comprises the plunger in the loading ':' - ■ rich its fork-shaped extension 8 outflow openings 13, via which removed the Rückflußöl from the valve train back into the oil sump of the engine The »05 roller 3 is mounted on the bolt 9 with radial play 14.

As can be seen from FIGS. 1 and 2, the return oil from the valve train can through the special arrangement of the drainage openings 13 so flow through the plunger 2 that it

did not get onto roll 3. The dirt particles contained in the reflux oil thus no longer reach the roller 3, so that damage to the running surface of the roller 3 is prevented. Finally, the running surface of roller 3 is adequately lubricated by the oil mist in the crankcase of the reciprocating internal combustion engine, while the application of an excessively thick oil film on the running surface of "roller 3, which leads to the roller slipping on the cam, is avoided. The radial play 14 between roller 3 and pin 9 causes during loading -.... '^"j" t £ IEBS the reciprocating internal combustion engine, a pumping action in this bearing, is drawn in the lubricating oil from the crescent-shaped oil jackets 10 out into the bearing point this pumping operation is caused through the constant pressure loading and unloading of the bearing. In this way *.. "-,. the storage of the roller 3 on the bolt 9 at

Lubricate sufficiently with little effort in terms of production technology ^,? .; - ν '- and the axial friction effect due to the small J ;. ^ _, reduce the sickle-shaped run-up mirror to a minimum. ■ ""'30

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Claims (4)

Klörkner-Humboldt-Oeutz AG bOOü Cologne 60, December 21, 1982 Our reference: D 82/45 AE-ZPB Ca / Bi P ate η claims f 1.Roller tappet for a valve train of a reciprocating internal combustion engine, consisting of a cylindrical plunger which is slidably mounted in the housing of the reciprocating internal combustion engine and which has a ball socket on its upper end face for receiving the shaft end of a pushrod that drives the valve train and supplies it with lubricating oil, where the Opposite ball socket, in a fork-shaped extension of the plunger, a roller mounted on a bolt with a lubricant supply is arranged, which runs on a cam, and the return oil from the valve drive can be drained away from the valve drive along the outside of the push rod and through drainage openings in the plunger,
characterized in that the discharge openings (13) are arranged in the region of the fork-shaped extension (8) of the plunger (2) and that in the sides of the fork-shaped extension (8) facing the end-face contact surfaces (15) of the roller (3) above the bolt (9) sickle-shaped oil pockets (10) are provided for supplying lubricant to the roller bearings and for the floating bearing of the contact surfaces (15). KlöcknnM lumbddt-Deulz AG ^ rIOCi * '-, 50.UUUoZ '· -' 2 -. 12/21/1982 D 82/45 2. Roller tappet for a valve train of a reciprocating internal combustion engine according to claim 1, characterized; that the sickle-shaped oil pockets (10) to the pressure oil circulation system of the internal combustion engine are connected. 3. Roller tappet for a valve drive of a reciprocating internal combustion engine according to one of the preceding claims , characterized in that a self-priming roller bearing is provided between the roller (3) and the bolt (9). · 4. Roller tappet for a valve train of a reciprocating internal combustion engine according to one of the preceding claims, characterized in that the roller (3) is mounted on the bolt (9) 'with a radial play (14) so that as a result the mechanical pressure loads and reliefs in the roller bearing a pumping effect can be achieved. »WO« 81M - "' ^{F3C0 / 1}