DE3233798A1 - ACTUATING LEVER FOR EXHAUST GAS VALVES OF INTERNAL COMBUSTION ENGINES - Google Patents

Description

Operating lever for gas exchange valves of internal combustion engines

The invention relates to an operating lever for gas exchange valves of internal combustion engines of the type according to the preamble of claim 1.

In a known operating lever of this type (DE-OS 28 19 356) the adjusting element is on the screw bolt rotatably arranged eccentric, which can be rotated to adjust the valve clearance. This type of valve clearance adjustment leads to a change in the kinematic conditions, because at the same time as the game change the distance between the support line of the contact surface of the eccentric and the bearing point of the actuating lever is changed. Depending on the design, this results in considerable deviations from the theoretical valve lift curve. This is the setting range is limited.

The invention is based on the object of an operating lever of the type according to the preamble of claim 1 so that when adjusting the valve clearance the change in the kinematic conditions is limited to a minimum.

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This object is achieved by the features specified in the characterizing part of claim 1. Through the invention is the adjusting element resting on the valve stem end essentially only in the direction of the valve axis movable and the position of the line contact on the setting element is retained.

Embodiments and further developments of the invention are characterized in claims 2 to 8.

Exemplary embodiments of the invention are shown in the drawing. Show it:

Fig. 1 is a plan view of an operating lever for gas exchange valves of internal combustion engines,

Fig. 2 is a side view of the operating lever according to

Fig. 1, wherein one side of the forked valve stem side The end of the lever has broken off, 20

3 is an enlarged side view of the valve stem side Lever end of the operating lever according to Fig. 1,

FIG. 4 shows a section along the line IV-IV of FIG. 3,

Fig. 5 is a supplement with stop surfaces for an eccentric attached to the screw bolt and for

Secure the attachment in position at the end of the lever 30

6 shows a section corresponding to FIG. 4

modified operating lever with the supplement according to Fig. 5,

7 shows a further embodiment of the actuating lever,

FIG. 8 shows a section along the line VIII-VIII in FIG. 7,

9 shows the lever end on the valve stem side of a further exemplary embodiment and

FIG. 10 shows a modification of the exemplary embodiment according to FIG. 9.

An actuating lever 1 designed as a rocker arm made of sheet metal for gas exchange valves of internal combustion engines, the is U-shaped in plan view, has two spaced apart and essentially each in one In the plane of the plane parallel to its oscillation plane, legs 2 are arranged. In the web area, the legs 2 and the web 3 form a spherical cap 4 for storage. At the lever end 5 on the valve stem side, a concentric annular disk 6 is formed Adjusting element jammed. The annular disk 6 has a cylinder jacket-shaped contact surface 7, which rests against the end face 8 of a valve stem end 9. The clamping force is provided by a screw bolt 10 with a nut 11 applied, which with its shaft 12 perpendicular to the plane of oscillation of the actuating lever 1 at the lever end 5 through elongated holes 13 in the legs 2 and protrudes through the annular disk 6. The elongated holes 13 are formed and arranged so that the line of contact on the Face 8 when adjusting the valve clearance by changing the position of the screw bolt 10 in the elongated holes is changed as little as possible. Thus, the elongated holes 13 extend essentially in the axial direction of the Valve stem end 9.

A collar is formed on the head 14 of the screw bolt 10, which is designed as an eccentric 15. It can also

the entire head 14 can be designed as an eccentric. According to FIGS. 1 to 4, 7 and 8, the head 14 or 114 is with a hexagon socket 16 or 116.

g One of the legs has at the lever end 5 on the valve stem side 2 on the outside of a projection 17, which by a bent back and resting on the leg 2 extension this leg 2 is formed. The side of the projection 17 facing the elongated hole 13 represents a stop - ^ q area 18. The eccentric 15 is supported with his Circumferential surface 19 on the stop surface 18 from.

To adjust the valve clearance, the nut 11 is only loosened to such an extent that the screw bolt does not move 10 in the elongated holes 13, but tilting is not possible because the eccentric 15 rests firmly on the leg 2. Then it will be the screw bolt 10 rotated. The eccentric 15 slides with its peripheral surface 19 on the stop surface 18 along, causes a sliding movement of the screw bolt 10 in the elongated holes 13 by being supported thereon and thus a displacement of the annular disk 6 between the legs 2.

Instead of the projection 17 formed by a bent extension, a Z-shaped insert 20 (FIG. 5 and 6) are used, the web 21 of which has an elongated hole 22 congruent to the elongated holes 13 and on the outside one of the legs 2 is applied. On one of the legs 23 of the insert 20 there is a stop surface 24 for the eccentric 15 formed and the other leg 25 is as a stop to secure the rotational position on a stop surface 26 of the Lever end 5 'on.

In the embodiment shown in FIGS. 7 and 8, the actuating lever 101, which is designed as a rocker arm, has at its lever end 105 on the valve stem side has a cast-on projection 117 aaf on which a stop surface 118

is designed for an eccentric 115. Otherwise points the actuating lever 101 has the same design as the actuating lever with regard to the valve lash adjustment 1 according to FIGS. 1 to 6.

The valve stem-side lever ends 205 and 305 of the actuating levers 201 and 301 shown in FIGS. 9 and 10, in each of which one of the legs 202 or 302 and the shank 212 or 312 of the screw bolt are omitted 210 and 310, respectively, are shown in section, each have an essentially rectangular, to the adjusting element Small plates 206 and 306 rounded on the narrow sides. One of the narrow sides forms the contact surface 207 or 307 for the face of a valve stem end.

The plates 206 and 306 are each on one long side by embossed projections 230 and 330 and on the opposite Side passed through the shaft 212 or 312 of the screw bolt 210 or 310. You stand with that the latter in each case by means of a form-fitting driving connection in engagement. In a recess 231 of the plate 206 a tooth-like projection 232 is arranged for this purpose, which in a longitudinal groove 233 in the shaft 212 of the screw bolt 210 intervenes. In the case of the plate 306, on the other hand, there is a tooth gap-like groove 333 in a recess 331 formed, in which a tooth-like radial projection of the shaft 312 of the screw bolt 310 engages.

When the clamping force of the screw bolts 210 and 310 through Loosening the nuts, not shown, is sufficiently reduced by turning the screw bolts 210 and A sliding movement of the plates 206 and 306 for adjusting the valve clearance is generated about their axes. After this Adjusting the clamping force is increased until the plates 206 and 306 are again secured in an operationally reliable manner.

Claims (1)

Δ 30 I ΌΟ Patent claims: My operating lever for gas exchange valves of internal combustion engines, - with a valve clearance adjustment device on the valve stem side Lever end, - The one of the lever end transversely to the lever swing plane penetrating screw bolts with a nut and - consists of a clampable adjusting element, characterized in that - That the screw bolt (10; 10 '; 110; 210; 310), the Adjusting element (ring disk 6; 106; plate 206; 306) and the lever end (5, 5 ', 105) mutually in this way are guided and supported, - That when turning the screw bolt (10; 10 '; 110; 210; 310) a relative movement between the setting element (washer 6; 106; plate 206; 306) and Lever end (5, 5 ', 105) arises, - Which lies essentially in the axial direction of the valve stem end (9, 9 ^!, 109). 2, actuating lever according to claim 1, characterized in that - That the screw bolt (10; 10 '; 110) has a non-rotatably connected eccentric (15; 15'; 115), - the Uinfangs surface (19, 19 ') on the side facing away from the valve stem end (9; 9'; 109) rests on a stop surface (18; 2k; 118) on the lever end (5; 5 '; 105), -that the shaft (11; 11 »; 111) of the screw bolt (10; 10 '; 110 ^{) protrudes through an elongated hole (13; 13'; 113) at the lever end (5, 5 f} , 105), - Which extends approximately in the direction of the valve stem end (9, 9 ', 109), and - That the adjusting element (6, 106; 206; 306) consists of a concentric annular disk (6, 6 ', 106), - whose Urafangfläche (19, 19 ') the contact surface (7, 7 *, 107) for the valve stem end (9, 9 ', 109). 3. Actuating lever according to claim 2, characterized in that - That the stop surface (18; 118) on a with the lever end (5; 105) integral shoulder (17; 117) is trained. 4. Actuating lever according to claim 2, characterized in that - That the stop surface (24) is formed on a leg (23) of a Z-shaped insert (20), - their other legs (25) as a stop for securing the position on a stop surface (26) at the end of the lever {5 *} and - whose web (21) is arranged between the eccentric (15 ') and the lever end (5 ^T ) and - Has an elongated hole (22) which is congruent to the elongated hole (13 ^{!) in the lever end (5 ').} 5. Actuating lever according to claim 2, characterized ^ou , - That the eccentric (15; 15 '; 115) is formed on the head (14; 14'; 114) of the screw bolt (10; 10 '; 110) Federal government is trained. 6. Actuating lever according to claim 2, characterized in that - That the eccentric forms the head of the screw bolt and has a hexagon socket. 7- actuating lever according to claim 1, characterized in that - That the shaft (212) has a longitudinal groove (233) and the adjusting element (Plate 206) one in the longitudinal groove (233) engaging complementary tooth-like pre-5 has jump (232). 8. Actuating lever according to claim 1, characterized in that - That the shaft (312) has a radial tooth-like projection (332) and the adjusting element (plate 306) a groove (333) receiving the projection (332).