JPS62139909A - Control mechanism adjusting four-cycle internal combustion engine during operation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control mechanism that allows the length of opening time of an engine valve to be changed during operation.

Conventional technical control mechanisms are well known, for example the BLF construction is described in Hungarian Patent No. 68538, in which separate cam discs are provided for forward and reverse rotation respectively; The rollers moving the control valve in the two rotational directions are rigidly connected and guided through a common path in such a way that they are brought into contact alternately with the corresponding cam discs.

The rollers are arranged along the displacement path and their task is to adjust the magnitude of the opening of the valve, ie to perform the so-called resteer J.

This technical solution requires the adjustment of all control valves and flushing valves, and moreover, several components
resulting in significant potential for failure.

Due to the relatively complex structure, this solution has not been widely used in the vehicle industry.

The structure according to Hungarian Patent No. 81566 shows another development trend. The patent discloses a "resteer" structure for a combustion powered machine that is allowed to travel in one direction or the other. In these combustion powered machines, two groups of cams serve to control the valves and are necessary to actuate the valves in the proper sequence when the direction of rotation of the machine is changed.

In the above-mentioned technical solution, the connecting arm penetrates from the transverse axis into a ring arranged on the cam shaft, so that the cams arranged in pairs in groups are rendered inoperable prior to displacement. The cams are displaceable in such a manner that they are operative when the cams of a single cam pair occupying the same position are displaced. There are two groups of cams on the camshaft, and in both groups the cams are arranged in pairs. A group of cams controls the valves when the engine is rotated in one direction. The remaining cams become operational when the engine is rotated in the opposite direction.

This structure also has some disadvantageous features.

In sequence, opening the valve for a relatively short length of time will result in an engine with economical operation but with reasonable power, whereas a longer length of time opening will result in a higher rpm and power output. It must be stated that this makes it possible.

A further significant drawback lies in the relatively high consumption, which in practice
The drive moment begins to increase with good efficiency only at higher rotational speeds. Another disadvantage lies in the increased contamination of the exhaust gases due to the longer period when the valves are in communication, and fresh, unburned gases are discharged to the atmosphere through the exhaust system.

To summarize the above, the known technical solutions are:
It can be said that it forces the designer to take certain steps.

OBJECTS AND SUMMARY OF THE INVENTION The object of the invention is to develop a control mechanism for regulating during operation a four-stroke internal combustion engine, with the aid of which an ideal opening time of the valves can be achieved approximately according to the rotational speed and which does not have the disadvantages mentioned above. It is. As a result, the drive moment increases evenly starting from a low rotational speed, and a sudden increase when reaching a certain rotational speed can be eliminated.

According to the invention, the above object is achieved by a control mechanism which may be characterized in that it comprises a camshaft fitted with a cam having a longitudinally conically shaped lifting snub. The width of the cam is equal to at least half the height taken in any longitudinal section, and the camshaft is mounted on a pipe-illuminated gear having a toothed internal bore.

In a preferred embodiment of the invention, the pipe-lighted gear is coupled to a mechanism having a governor weight.

In a preferred embodiment, the pipe gear is coupled to the lifting magnet by inserting a lever.

The invention therefore relates to a control mechanism whose camshaft is movable longitudinally during operation. Compared to normal dimensions,
The cam of the control mechanism is wide and the lifting snub is conically shaped in the longitudinal direction. Thus, in the forward part of the structure, the valve is kept open at a degree of 200' displacement of the main shaft, while in the rearward part of the structure, the valve is kept open at a degree of displacement of 200' of the main axis.
It is achievable that a length of time of release corresponding to 50° is maintained.

The trunnion, which rotates in the bearing of the camshaft due to the longitudinal movement, is also six wider than usual.

The camshaft with opposite teeth can be easily displaced in the longitudinal direction, taking into account that the drive is transmitted by a toothed gearwheel in which a toothed bore is formed.

With the control mechanism configured in this way, the length of the opening time of the valve can be varied depending on the rotation of the engine during operation.

The invention will be described in detail below with respect to preferred embodiments thereof and with reference to the accompanying drawings.

EMBODIMENT OF THE INVENTION As is clear from FIGS. 1 and 2, the camshaft 2 is fitted with a cam 1 formed with a lifting snub having a conical shape in the longitudinal direction. The width (S) of the cam 1 is equal to at least half the height m> taken in any longitudinal section, and the camshaft 2 is mounted on a gear wheel 4 with a toothed internal bore 3.

The cams 1 are not placed close to each other on the camshaft 2, thus making it possible to form a wide-medium cam, creating significant variation possibilities.

As can be seen in FIG. 2, the trunnion of the cam 'Nl 2, which rotates in a sliding bearing, which is known per se, is suitably formed.

Figures 3a and 3b show a gear 4 with vibrations suitable for transmitting moments. The outer mantle of the pipes also rotates in plain bearings. The displacement of the gear in the longitudinal direction is closed by a ring (not shown) arranged in the groove. ) to adjust the displacement.

As can be seen in FIG. 4, the mechanism 5 may be constructed in such a way that, upon an increase in rotational speed, a known governor weight displaces the camshaft against a spring force, while the desired opening The length of time is controlled by the conical snub of the cam by adjustment υ11.

An arrangement is also possible in which the compression spring is configured to press the camshaft 2 into its basic position. The lever 6 is connected to an electromagnet 7 at the end of the short axis.

A current controlled by an electronic rotation counter is increased depending on the rotational speed to activate the electromagnet, which therefore places the camshaft 2 in the appropriate position.

When applying the mechanism according to the invention, the legs of the swinging arms have to be modified, namely FIGS. 6a, 6b, 7a,
Must be modified according to FIG. 7b. The legs of the swinging arms must each be rounded and the surface of the cantilever block 9 that contacts the cam is advantageously formed with a curvature in such a way that the contact surface is reduced.

[Brief explanation of drawings]

Figures 1a and 1b are diagrams of the conical cam, Figure 2 is a diagram of the camshaft, Figures 3a and 3b are diagrams of the drive gear, Figure 4 is a diagram of the device for opening the valve, and Figure 5 is a diagram of the device for opening the valve. Figures 6a and 6b show the mode of operation of the electromagnet; Figures 6a and 6b show the mode of lifting the valve; Figures 7a and 7b show the legs of the swinging arm. 1...Cam 2...Cam shaft 3...Toothed inner bore 4...#wheel m...Cam height S
...Cam width 5...Mechanism 6...Lever 7...Electromagnet

Claims (3)

[Claims] (1) In a control mechanism for regulating a four-stroke internal combustion engine during operation by means of a longitudinal conical shape, a cam (1)
The width (S) of is the height (
Control mechanism, characterized in that the camshaft (2) is mounted on a pipe-necked gear (4) with a toothed inner bore (3) equal to at least half of m). (2) The control mechanism according to claim 1, wherein the pipe neck gear (4) is coupled to a mechanism (5) having a speed governor weight. (3) A control mechanism according to claim 1, characterized in that the pipe-necked gear (4) is coupled to an electromagnet (7) by a lever (6) inserted therebetween.