RU63869U1 - MECHANISM FOR CHANGING THE HEIGHT OF THE LIFTING VALVES OF THE GAS DISTRIBUTION MECHANISM OF THE INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

The mechanism for changing the lift height of the valves of the gas distribution mechanism of an internal combustion engine is intended for use in internal combustion engines. The mechanism contains rockers (5), resting at the ends of the first side on the corresponding valve stems (6), at the other ends of the first side resting on the cams of the camshaft (7). It is equipped with a support shaft (2), which is connected via gears to the second sides of the rockers (5), the end of the support shaft (2) is connected to the drive shaft for moving the support shaft (1). The support shaft (2) is pressed with the possibility of movement through the gearing to the support strips (4) with the toothed surface by means of clamping strips (3) acting on the support shaft via bearings (13) placed on it. The drive movement of the support shaft (1) can either be made hydraulic or electric with a gear or worm gear. 2 s.p. f-ly, 14 ill.

Description

The utility model relates to mechanical engineering and can be used in internal combustion engines.

Known analogues containing a camshaft with cams, rocker arms interacting with camshaft cams and resting on valve stems of a gas distribution mechanism of an internal combustion engine (see, for example, descriptions of inventions to patents RU 2046964, 6 F01L 1/18, publication date 1995.10.27; RU 2183749, 7 F01L 1/18, F02F 1/24, publication date 2002.06.20; US 3422803, F01L 1/18, F02B 1/06, publication date 1969.01.21).

The closest analogue is a mechanism containing rockers, one ends of the first side resting on the corresponding valve stems, the other ends of the first side resting on followers transmitting movements from the camshaft cams (see, for example, the description of the invention to the patent US 3422803, F01L 1/18, F02B 1/06, publication date 1969.01.21). The height of the valve is controlled by moving along the second side of the rocker a movable thrust element that rotates around an axis, and thereby changing the position of the rocker rocking point. The second side of the rocker has a curvature corresponding to the distance from the axis of rotation of the movable thrust element to the surface of the second side of the rocker.

The disadvantage of the closest analogue is the low reliability of the mechanism. This is due to the fact that it is fundamentally impossible to get rid of the efforts directed along the axis of the rockers that arise in the process of regulation, acting perpendicular to the axes of the valve rods, and the regulating element, the surface of the rocker, arising due to friction in each pair. The longitudinal force transmitted to each valve stem sharply increases the friction between the guide sleeve and the valve stem, which reduces the reliability of the engine timing at high speeds. In addition, the second surface of each rocker can only be made concave in principle, which reduces the rigidity of the structure.

The technical result of the claimed utility model is to increase the reliability of the mechanism at high speeds by reducing friction between the support shaft, rockers and valve stems and the ability to reduce the mass of each rocker by optimizing its shape.

The technical result is achieved by the fact that the mechanism is equipped with a support shaft, which is connected via gears to the second sides of the rockers, the end of the support shaft is connected to the drive shaft of the support shaft, the support shaft is pressed to move through the gears to the support bars with a toothed surface by means of clamping bars, acting on the support shaft through bearings placed on it.

The essence of the utility model is illustrated by drawings, where

figure 1 shows a top view;

figure 2 shows a side view in section aa with the first embodiment of the rocker;

figure 3 shows a top view with locking plates;

figure 4 shows a side view in section CC with locking plates;

figure 5 shows a top view with chevron engagement;

figure 6 shows a side view in section D-D;

7 shows a side view in section aa with a second embodiment of the rocker;

on Fig shows a side view in section aa with the third embodiment of the rocker;

figure 9 shows a side view in section aa with the fourth embodiment of the rocker;

figure 10 shows a side view in section aa with a fifth embodiment of a rocker;

11 shows a side view in section aa with a sixth embodiment of the rocker;

on Fig shows a side view in section aa with the position of the support shaft closer to the valve stem;

on Fig shows a side view in section aa with the position of the support shaft closer to the cams of the camshaft;

on Fig shows a side view in section bb.

The mechanism for varying the lift height of the valves of the gas distribution mechanism of the internal combustion engine comprises rockers 5, resting on the valve stems 6 at one end of the first side, and camshafts 7 resting on the other ends of the first side, a support shaft 2, which is connected to the second sides of the rockers 5 via gears, the support shaft 2 is connected to the drive movement 1 (Fig.1, 2). The gears provide a fixation of the position of the rockers 5 in the longitudinal direction. The fixation of the position of the rockers 5 in the direction parallel to the axis of the support shaft 2 is provided, for example, by fixing plates 8 (Figs. 3 and 4), mounted on the cylinder head housing, entering the slots at the ends of the rockers 5, or by performing gearing in the form of chevron gearing ( figure 5). On the cylinder head 14 of the internal combustion engine parallel to the axis of the rockers 5 fixed gear fixed support strips 4 included in the gearing with the support shaft 2 (1, 3, 5, 14). The gear parameters are the same in all the details of the mechanism. The support shaft 2 is pressed against the gear support strips 4 by means of clamping strips 3 fixed to the cylinder head housing 14 and acting on the support shaft 2 through bearings 13 placed on it (Fig. 6). The surface of the rockers 5 can be given the curvature optimal from the point of view of their strength in a particular layout (Fig. 7, 8, 9, 10, 11,). The corresponding curvature is attached to the gear support strips 4 and the clamping strips 3 (Fig.7, 8, 9, 10, 11,). Rockers 5 on the first side above the valve stems 6 may have a cylindrical convex 9 with a generatrix radius equal to the distance from the center of the support shaft (when it is positioned strictly above the valve axis) to the upper end of the valve stem 6, to ensure a constant position of the valve stem 6 in the position of the support shaft 2 above the axis of the valve 6 (Fig.8). Above the end of the valve stem 6, a hydraulic compensator of the gap 10 can be located (Fig. 9), or an adjustment cam 11 (Fig. 10). At the end of the rocker 5 above the cam of the camshaft 7, a bearing 12 is possible to reduce friction (Fig. 11).

The drive movement 1 of the support shaft 2 can be made either hydraulic or electric with a gear or worm gear.

The mechanism of changing the height of the lift valves of the gas distribution mechanism of an internal combustion engine is as follows. When the camshaft 7 rotates, its cams act on the ends of the rockers 5, causing them to move and rotate the rockers 5

relative to the point of contact in the gear engagement of the rockers 5 with the support shaft 2. At the same time, the other ends of the rockers 5 will move together with the valve stems 6 resting on them. If necessary, change the height of the valves 6 when adjusting the operation of the internal combustion engine, the actuator 1 moves the support shaft 2 along the surfaces of the rockers 5. In this case, gearing between the support shaft 2 and the fixed gear support plates 4 ensures that the support shaft 2 rotates by an angle corresponding to its linear remescheniyu. When the support shaft 2 moves along the surfaces of the rockers 5, the ratio of the swing arms changes from the contact point of the support shaft 2 and the surface of the rocker 5 to the ends of the rocker 5, which are affected by the cam of the camshaft 7 and the end of the rocker 5, which acts on the valve follower 6. Due to the correspondence the angle of rotation of the support shaft 2 to its linear movement, there is no longitudinal effort in the gearing between the support shaft 2 and the rocker 5, as a result of which there is no longitudinal movement of the rocker 5, causing transverse the load when the rocker 5 acts on the valve stem 6. In the process, the contact between all gear surfaces is provided by the clamping plates 3. Work at different positions of the support shaft 2 is illustrated by drawings (Fig.1, 2, 3, 12, 13, 14, fifteen). When moving the support shaft 2 to the side of the valve rods 6, the stroke of the latter during operation of the gas distribution mechanism decreases, up to zero when the position of the support shaft 2 is strictly above the axis of the valve stem 6 (Fig. 12). When moving the support shaft 2 towards the camshaft 7, the stroke of the valve 6 increases (Fig.13).

A study of publicly available sources of information confirms compliance with patentability criteria.

Claims (3)

1. The mechanism of changing the height of the valve lift of the gas distribution mechanism of an internal combustion engine, comprising rockers, resting on the corresponding valve stems at one end of the first side and resting on the camshaft cams at the other ends, characterized in that it is provided with a support shaft that is connected to by the second sides of the rockers, the end of the support shaft is connected to the drive drive to move the support shaft, the support shaft is pressed to move through the gear pin Leniye to the support strips with a toothed surface means of clamps acting on the support shaft through bearings located thereon. 2. The mechanism according to claim 1, characterized in that the drive movement of the support shaft is made hydraulic. 3. The mechanism according to claim 1, characterized in that the drive movement of the support shaft is made electric with a gear or worm gear.