JPS6047446B2 - valve rotation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rolling arrangement supported on a base body, for the guidance of a rolling body, a spring element with a race, and a valve spring force that allows the rolling arrangement to move into a pocket of the base body. The present invention relates to a valve rotating device, particularly for an internal combustion engine, which uses a rolling body that rolls on a rolling path arranged in a rotary shaft.

A valve rotation device that utilizes the force of a valve spring acting in the axial direction of the valve to cause the valve to rotate during the opening or closing movement of the valve cannot be used in an automatic engine or a diesel engine. Known.

In that case, the rolling bodies in the path of the base body are loaded by the valve spring via a disc-shaped intermediate element.
Since the running path has a component force inclined in the horizontal plane, the rolling body loaded by the valve spring may perform a rolling movement in the circumferential direction causing rotation of the valve. Various forms of valve rotation devices as described above are disclosed, for example, in German Patent Nos. 1 and 9.
No. 55,8 and the same patent application nos. P2llO7O8 and P263O296. A disc spring is inserted as the disc-shaped intermediate element, which is placed directly on the rolling object and has one running groove cut in it to alleviate impact contact. There is.

Instead of providing running grooves on the disk spring, it is also possible to use races with running grooves. Whether the rotating device works perfectly or not depends largely on how the rolling body moves in the width direction, that is, the radial direction.

Generally, the rolling object is arranged approximately midway between the outer diameter and the inner diameter of the disk spring. By using the running grooves in the discs, the running path of the ball rolling is precisely determined and, if the diameter of the running path is precisely selected, the rotating device can work reliably. The above-mentioned rotating device must create a rotational moment for the rotation of the valve plate that is transmitted to the valve as easily as possible.

One of the reasons for this is that the valve plate must be rotated by overcoming the significant frictional moment generated in the valve guide, in the rocking lever base, or caused by the cylinder being tightly closed. This is because it cannot. It must also be ensured that the braking moment generated within the rotating device itself is as small as possible. However, experience has shown that when the valve spring is pressed downward, the lateral forces exerted by the valve spring cause the intermediate element, or countersunk, and the valve spring to rest against each other. As a result, the valve guide installed thereon moves while being exposed to friction and impact. This is,
This results in a deterioration of the rotational movement and, in some cases, a stoppage of the rotating device, thereby causing damage and even destruction of the sliding parts. The object of the present invention is to provide a valve rotating device of the type mentioned at the beginning so that its internal braking loss is as small as possible.
It consists in giving form.

This object is solved by the invention, which is characterized in that a fit is provided between the parts of the rotating device, which transmits the rotational movement of the rolling body to the valve.

According to the present invention, the spring element located between the cover on which the valve spring is mounted and the rolling object is fitted into the cover, so that the combination of the spring element and the cover does not shift from their center. guaranteed.

In another aspect of the present invention, a rolling object race (ball bearing race) is used between the spring element and the rolling object, but in this case as well, the race cover is fitted into the small bar, so that the same effect can be achieved. The effect of this can be obtained. When only the spring element, that is, a disc spring, is used, the deepest part of the cross section of the running groove should be separated from the outer edge of the disc spring by 35 to 65% of its width in the width direction of the disc spring. is advantageous. With the above configuration, the force that attempts to move the cover laterally is absorbed by the operation of the rolling object.

This is because the disc spring is fitted into the cover and has a circular running groove for guiding the rolling object. All rotating parts of the rotating device that transmit the rotation of the rolling body to the valve are held in a central position without rolling friction. All adverse sliding friction is thus avoided. Next, the present invention will be described in more detail with reference to drawings showing embodiments of the present invention.

The illustrated valve arrangement produces a rotational movement in the valve during its opening movement.

During the opening movement, when the spring force P of the valve increases, the cover 5
through which a load is applied to the spring element or disc spring 1, so that the sphere 2, which is arranged in the inclined track 4 of the base body 3, rolls towards the lowest part of this track 4. This rotation is then transmitted to the spring element 1 through the cover 5 of the device to the valve spring 6 and from this to the valve. In this embodiment, the spring element, which is configured as a countersunk, is provided with a running groove 7, so that the spring element has the following features:
It is guided by a ball rolling in the inclined running path 4 while maintaining a predetermined center position. A lateral component P1 of the spring force P that is always present acts on the cover 5, and this component tends to cause eccentric movement, but due to the fitting 8, the force par 5 is also maintained at a predetermined level. held in the center position. Splash element 1
Even when a spherical race 9 is provided between the spherical body 2 and the spherical body 2, the same effect as in the above case can be achieved if a fit 10 is provided between the race 9 and the cover 5. In the embodiment of FIG. 1, concentric guidance of the rolling sphere is achieved by means of the running groove 7 in the spring element 1, but the third
As shown in the figure, the spherical race 9, with its incised running groove 11, takes over this function.

In this case, the spring element 1 is not provided with a running groove.

[Brief explanation of drawings]

FIG. 1 is a radial cross-sectional view of a valve rotation device without a ball race, FIG. 2 is a cross-sectional view of a ball running path along line A-B in FIG. 1, and FIG. 1 is a radial cross-sectional view of a valve rotation device with a

Claims (1)

[Scope of Claims] 1. A valve rotation device using a rolling object, which is used particularly in an internal combustion engine with a valve spring, which (1) houses the aforementioned rolling object and a spring means for biasing the rolling object. a base object comprising a pocket; (2) located on said base object;
(3) a spring element having an annular running groove on the bottom surface to guide the rolling object; and (3) a cover positioned over the spring element to which the force of the valve spring is applied. a cover in a mating relationship with said spring element, thereby preventing relative movement therebetween in a direction transverse to an axis of the valve rotation apparatus. 2. In a valve rotating device using a rolling object, which is particularly used in an internal combustion engine with a valve spring, (1) a base object provided with a pocket for accommodating the aforementioned rolling object and spring means for biasing the rolling object; and (2) located on the base object,
an annular ball receiving race having an annular running groove on the bottom surface and guiding the rolling object; (3) a spring element located on the ball receiving race and supported by the ball receiving race; and (4) a cover positioned over the spring element and to which the force of the valve spring is applied, the cover being in a mating relationship with the ball catch race, thereby a valve rotating device adapted to prevent relative movement with respect to each other in a direction transverse to the axis of the valve rotating device;