SE450783B - DEVICE FOR TURNING A COMBUSTION ENGINE VALVE - Google Patents

Description

15 20 25 30 35 450 783 2 energy. A disadvantage of this design is the relatively large space requirement in the axial direction and the diameter direction, compared with conventional designs, since the space available in the engine is generally quite limited. Another possibility for valve rotation during the closing stroke is shown in DE-OS 30 04 320. A disc-shaped spring is used as a gear element for loading and unloading balls running in oblique pockets - so that the balls held by helical springs move the disc springs in such a way that a rotation of the disc-shaped spring element is obtained, which is used to turn the valve. It is true that the entire closing stroke of the valve is used for rotation, but even when the valve is opened, a rotation in the opposite direction occurs, as described on page 18, second paragraph in DE-OS 30_04 320, whereby the resulting rotation is obtained only as a difference between both rotational movements. which leads to an undesirable reduction of the rotation during the closing stroke.

The invention has been given to the object of providing a valve turning device with a relatively known embodiment of smaller space requirements, which rotates the valve during its closing movement and which does not cause any undesired rotation during the opening stroke. The solution according to the invention is characterized in that extra rolling elements are arranged on the base body, which support the spring element, which are concentric with the rolling bodies and in the area between them and the point of attack of the valve spring force on the spring element.

The spring element is thus further supported approximately in the middle between its inner and outer diameters by a number of rolling elements, for example balls, which run in a base cut concentrically arranged around the axis of the base body, so that it bends under load over the circular ball row thereby formed. The above-mentioned rolling bodies on the sloping plane of the pockets in the base body lie on the same side on the inner or outer edge of the spring element 10 15 zoo 30 30 1 p 450 785 3 as the rolling elements orbiting in the shallow, concentric notch in the base body and are relieved when the spring element is loaded . The inclination of the sloping planes must be such that the circumferential force derived by the spring element from the axial force of the valve spring can overcome all rotational resistances. The spring element, preferably a flat annular disc or a conical disc spring, the latter also known as disc spring, serves as a working magazine for the energy required during the rotation process. Further features for further developments of the inventive concept appear from the subclaims.

The special advantage of the invention compared with known, working according to the same principle consists in lower construction dimensions and simpler construction.

The accompanying drawing indicates two of several possible embodiments of the invention in a schematic manner, which are explained in more detail below. In this case, Fig. 1 shows a rotating device with the valve fully open, Fig. 2 a rotating device at the end of a torque and Fig. 3 a rotating device with the rolling bodies producing the rotation concentrically inside the running circuit of the supporting rolling elements.

A disc spring 1, according to Fig. 1, flat tensioned, rests on rolling bodies 2 and additional roller elements 6. The rolling bodies 2 are movable in pocket-shaped recesses in a, basic body 3. In the pockets there are running surfaces 4 with inclination relative to the plane of the tensioned disc spring 1, on which inclined surfaces they roll during their movements at an angle Oba A compression spring 8 ensures that the rolling bodies 2 are always pressed against the shallower part of the pocket-shaped recesses during unloading. A cover 7 transmits the forces P1 - P2 from the non-returned valve springs to the disc spring 1.

In addition to the rolling bodies 2, in the embodiment shown they consist of balls, on the base body 3 there are rolling elements 6, in the example shown also balls, con- 4 15 50 25 30 4-50 785 4 centrally placed relative to the rolling bodies 2. This concentric placement can be taken both radially outside and radially inside the rolling body running circle, if the force point of attack of the lid 7 on the disc spring 1 is changed to the required extent. In the example shown in Fig. 1, the force point of action of the lid 7 is located on the disc spring at the radially inner edge, with a position of the supporting balls 6 concentrically inside the running circuit of the rolling bodies. In Fig. 3, on the other hand, the force point of attack of the lid 7 lies on the radially outer edge of the disc spring 1, so that also the support balls 6 are placed outside the running circuit of the rolling bodies.

The roller elements 6 form support points 10, so that the disc spring has the effect of a double-armed lever. The point of contact of the rolling bodies 2 with the disc spring 1 has been denoted by 9.

To reduce the surface pressing in the base body, the roller elements 6 move in grooves 5. The running surfaces of the pocket-shaped recesses are also curved to reduce the surface pressing.

The abutment points 9 and 10 of the balls 2 and the ball row 6 against the disc spring 1 can also be advantageously designed as ball raceways, in order to achieve a good control of the disc spring 1 and a reduction of the rolling pressure between the balls 2 and the ball row 6 on the one hand and the disc spring on the other. side.

Fig. 1 shows a rotating device with a fully open valve with tensioned disc spring 1 and the rolling bodies 2 in the end position before the rotation begins. The sloping running surfaces 4 incorporated in the base body 3 with the angle of inclination are shown in cross section in Fig. 1.1, in plan view in Fig. 1.2 and in tangential unrolling on the ball sub-circuit with radius r in Fig. 1.3. The disc spring 1 rests at the open valve on the roller elements 6 guided in the insert 5 of the base body 3 and is loaded axially by the lid 7. The tangential springs 8 have previously pressed the balls 2 to the lowest intake depth on the sloping tracks 4, so that the 0 'Q l0 l5 20 25 30 35 450 783 5 touch both the disc spring 1 and the raceways 4.

If the concentric axial force P2 applied by the valve spring is reduced at the closing of the valve, towards the end down to P1, the tensioned disc spring 1 exerts forces on the balls 2, which then unroll accordingly in force direction in the circumferential direction on the raceways 4 and transmit its rolling movement to the disc spring 1, which thereby travels the double rolling distance of the balls 2 and thus rotates together with the lid 7 about the axis a - b of the base body.

Fig. 2 shows the position at the end of rotation. The balls 2 are located at the greatest achievable depth on the raceways 4. They have rolled from position 1, Figs. 1.2 and 1.3, to position 2, Fig. 2.1 and Fig. 2.3, and have performed a translation around the angle 'P, Fig. 2.2 , with, fig 2.3, so that the disc spring has been turned 2 .Y 'and the rolling distance 2r .ÜÛ has been covered.

Fig. 3 shows a turning device in the same initial position the rolling distance r. Y as in Fig. 1, however with inverted placement of the balls 2 which now sit on the inner edge of the base body 3. The ball row 6 is again located approximately in the middle of the solid cross-sectional part of the base body 3 and the disc spring 1. Corresponding to the lateral position of the balls 2, the disc spring 1 is loaded at its outer edge through the lid 7. A further possibility of holding the rolling presses comes from the balls 2 and the ball row 6 on the disc spring 1, away from it, offers the two ball ring rings 11 and 12. The function of these embodiments according to Fig. 3 is the same as according to Fig. 1. After completion of rotation, a representation analogous to Fig. 2 is obtained with correspondingly inverted inclination of the disc spring.

For both the embodiment according to Fig. 1 and according to Fig. 3, it can be advantageous to replace the rolling elements represented as ball row 6 with a complete axial rolling bearing of known design, for example an axial ball bearing, axial roller bearing or axial needle bearing. In addition, both embodiments of the rotating device can be equipped in a known manner by placing an inner cone in the base body 3 for receiving valve pieces for attaching the rotating device to the shaft end of the valve to be rotated.

Claims (8)

10 15 20 25 30 450 783 PATENT REQUIREMENTS 1. A device for rotating a valve for internal combustion engines during the closing movement of the valve, using rolling bodies (2), which pockets with a sloping plane (4) arranged concentrically around the axis of a base body (3) are biased by tangential under the load of the rolling bodies (2) compressible springs (8) in the direction of the shallower part (4) of the pockets and which cooperate with a spring element (1) located opposite the pockets, which is clamped at the opening movement of the valve under increasing load by the valve spring resp. the valve springs in the valve axial direction, the rolling bodies (2) in the valve axial direction being relieved by increasing tension of the spring element (1) while being further loaded at the relief of the spring element (1) for relative rotation of the base body (3) relative to the spring element (1). characterized in that concentrically relative to the rolling bodies (2) and in the area between them and the point of attack of the valve spring force (P1, P2) at the spring element (1) an extra roller element (6) supporting the spring element (1) is arranged on the base body (3). Device according to claim 1, characterized by a conical ring disc. from the fact that the spring element (1) is designed as Device according to claim 1, characterized in that the spring element (1) is designed as a leveling disc. n a d Device according to Claim 1, 2 or 3, - in that the spring element (1) has worked-in running surfaces for guiding the rolling bodies (2) and the rolling elements (6). Device according to claim 1, 2 or 3, characterized in that a running ring for the rolling bodies is arranged between the spring element (1) and the rolling bodies (2). k ä n - 10 450 783 8 Device according to one or more of Claims 1 to 3 and 5, the spring element (1) and the roller elements (6) are provided with a ball ring (12). k ä n n e t e c k n a d thereof, that between Device according to one or more of the preceding claims, characterized in that the roller elements (6) are summarized in an axial rolling bearing. Device according to one or more of the preceding claims, characterized in that the base body (3) has a central opening, the mantle surface of which has an inner cone for receiving pieces for attaching the device to the shaft end of the valve to be rotated. - rails. -w