RU9914U1 - HYDRAULIC DEVICE FOR TENSIONING A CHAIN OR BELT OF THE ENGINE GAS DISTRIBUTION - Google Patents

Abstract

Abstract to the certificate on PM No.

Hydraulic device for tensioning the value or belt of the engine timing mechanism.

The utility model relates to engine building, but it can be used in gas distribution mechanisms of internal combustion engines (ICE), in shock absorbers of transport means.

The objective of the utility model is to simplify the design, reduce its cost, as well as increase the efficiency and reliability of the device.

The device comprises a housing 1 with a connecting flange 2 and a channel 6 for the supply of working fluid, in the inner cavity of which a spring-loaded plunger 3 is installed with means for fixing in the axial direction 5.

A distinctive feature of the utility model is that inside the cavity of the device body 1, which communicates with the working fluid supply channel 6, a compensation chamber A is formed, communicating with the working chamber B through the valve assembly 7, in the axial channel 8 of which a spring-loaded spherical locking element 9 is installed, supply the working fluid to the galling organ is made of two communicating axial 8 and radial 9 channels, the compensation chamber A is provided with a drainage channel 12, and a displacer is located in the working nostrum of the plunger 3 b 13.

The main area of application is passenger cars.

Description

Hydraulic device for tensioning the value or belt of the engine timing mechanism.

The utility model relates to mechanical engineering, in particular engine manufacturing, and can be used in devices for changing the tension of the drive element (price, belt) of the distribution mechanism of the internal combustion engine (ICE), in shock absorbers of transiortion devices.

A device is known for tensioning the drive element (chain or belt) of the gas distribution mechanism of the internal combustion engine of cars produced by AvtoVAZ, see V. Vershigora et al. Automobiles VAZ, M., Transnort, 1973, p. 43, comprising a housing, in the inner nostrum of which a spring-loaded plunger with an internal recess is installed, and a spring-loaded rod located in the plunger, equipped with a bulge and a washer mounted on the rod.

In the known device, the absorption of the disturbing force from the drive element (chain or belt) at the first stage occurs due to compression of the plunger spring, at the second stage - due to compression of the rod spring by the size of the gap between the end of the shaft thickening and the bottom of the plunger, at the third stage, the bottom of the plunger hits but end

thickening of the rod, from which the end of the thickening of the rod is always brilliant from impacts.

The spring of the rod, compressing by the size of the buffer stroke, according to the operating characteristics of the spring, has practically no strength growth, and to absorb the shock of the drive element, it is necessary that the force that counteracts the shock automatically reaches a value equal to the impact force of the drive element at the moment.

For soft shock absorption, it is necessary that the buffer stroke should be more than 1 mm, but not more than 2.5 mm, in order to prevent the drive element from slipping through the sprockets, which would lead to an unregulated timing mechanism and engine failure.

The spring of the rod, returning from the compressed state to its original initial position, through the washer, plunger, shoe supplies a disturbing vibrational impulse to the drive element, enhancing its vibrations. The time for applying a disturbing pulse to the drive element directly depends on the size of the buffer stroke: with an increase in the buffer stroke, the operation of the device deteriorates. The known device, instead of damping the vibrations of the drive element, delivers a disturbing vibrational pulse to the drive element, amplifying the vibrations.

At the moment when the perturbing pulse supplied to the drive element from the working engine (the frequency of the supplied pulse depends on the engine speed) coincides in frequency with the frequency of the natural vibrations supplied from the tensioner (each engine has its own specific speed range), a resonant phenomenon arises, which sharply increases the oscillation amplitude of the drive element, enhances shock, increases the wear rate of timing parts, destruction of individual parts is possible, the amount of harmful engine operation

the engine noise and the uneven rotation of the cam shaft increase and amplify, which increases the offset from the nominal location of the timing phases,

The resonance phenomenon in the timing drive element always occurs when the engine speed in the stage of decrease or increase passes through the resonant speed range.

As a prototype of the utility model, the tensioner of the drive element of the gas distribution mechanism of the internal combustion engine, described in A.S. : €€ Ife 1038657, MKI F16H 7/08, nyiJt. 08/30/83, bull. No. 32, comprising a housing, in the inner cavity of which a spring-loaded plunger with an internal recess is installed, and a rod located in the plunger of a working shaft with a thickening and a washer mounted on the rod. The housing is equipped with a channel for supplying fluid to its internal cavity, and the washer is made stepped in internal diameter, and the larger diameter of the stepped surface covers the thickening with the formation of an annular gap.

The disadvantages of the described prototype in the first place include the complexity of its design, which is due to a significant number of its constituent elements. In addition, the supply of oil to the tensioner housing is not provided by special means, but is carried out due to the ingress of oil into the channel during engine operation by gravity, while at the initial moment of engine operation, oil may be absent in the tensioner housing or its quantity may be insignificant, which at the initial stage starting and running the engine inevitably leads to a hard contact of the rod with the plunger (hammer effect), which ultimately leads to increased noise of the drive and progressive wear of engine parts i. For the above reasons, the described design of the tensioner could not be found

industrial applications in engine production at the Volga Automobile Plant.

The objective of the utility model is to simplify the design, reduce its cost, and even improve efficiency and iia / c.Kio. : device operation.

The problem is solved in that in the hydraulic device for tensioning the value or the belt of the gas distribution mechanism of the internal combustion engine, it contains a housing with a connecting flange and a working fluid supply channel, in the internal cavity of which a spring-loaded plunger is installed with fixation means in the axial direction, inside the housing cavity , communication; ayush; adjacent to the working fluid supply channel, a compensation chamber is formed, communication, ayush; connected to the working chamber by means of a valve assembly, in the axial channel A spring-loaded spherical closure is installed. The supply of the working fluid to the shut-off element is made in two communicating ways: by axial and radial channels, however, they allow the maximum use of the volume of the compensation chamber. The compensation chamber is equipped with a drainage channel, soysh; ayush, it has its cavity with the external environment. A displacer in the form of a rod is located in the working cavity, which allows to minimize the volume of the working cavity.

The design of the utility model is shown in FIG. 1.

The device comprises a housing 1 with a connecting flange 2, in the inner cavity of which a plunger 3 is installed with a spring 4 and with fixing means in the axial direction 5. A channel 6 is made in the housing 1 of the device for supplying a working fluid (oil) to its internal cavity, inside of which is formed compensation chamber A, communicating with the working chamber B by means of a valve assembly 7, in the axial channel 8 of which a spherical locking element 9 with a spring 10 is installed. Supply of working fluid to the locking body

made by two communicating axial 8 and radial 11 channels. Compensation chamber A is equipped with a drainage channel 12, communicating its cavity with the external environment. In the working cavity of the plunger 3 is a displacer 13 in the form of a rod.

The spring 4 at one end abuts against the end of the plunger 3, and at the other into a cup 14, pinched in the conical recess of the valve assembly 7. To improve the oil supply to the chamber A, the sealing element 15 is axially mounted on the housing 1 of the device.

The device operates as follows.

At the time of start-up after assembly of the device (when there is no working fluid in the device case), oil from the channels of the engine lubrication system under pressure enters through the channel 6 into the compensation chamber A. By exerting pressure on the shut-off element 9 of the valve assembly 7, the oil flows through channels 8 and 11 into the working chamber B. The air contained in the oil is removed from the chamber A through the drainage channel 12, and from the chamber B through the gap between the housing 1 and the plunger 3. In order to accelerate the filling of the chamber B and bring the device into working condition, it is placed inside 3 lunzhera propellant 13 having a shape of a rod.

The working process. The drive circuit of the internal combustion engine mechanisms acts on the plunger 3, moving it in the housing 1 of the device. When the plunger 3 is compressed, the chamber B is locked by the organ 9 of the valve assembly 7 and shock damping occurs due to oil leaks through the gap between the plunger 3 and the housing 1. When the chain moves away from the tensioner, the spring 4 moves the plunger 3 after the chain when the plunger exits 3 from the housing 1, the locking member 9 opens, since the force of the spring 10 pressing the locking member 9 is incomparably small with respect to the force of the spring 4 of the plunger 3, and oil under pressure fills the working chamber B.

When the engine is stopped for a long time, oil flows out of chamber B, but in chamber A, the amount of oil that is needed to start up before the oil arrives under operating pressure from the oil pump is stored. With axial vibrations of the plunger 3, the oil from the chamber A iostuates into the chamber B and fills it, displacing the air. Next, the nlunger 3 works in working mode.

In order to fully utilize the buffer volume of camera A, channel 11 for communication with camera B is made at the bottom of camera A.

Claims (1)

A hydraulic device for tensioning a chain or a belt of the engine gas distribution mechanism, comprising a housing with a connecting flange and a working fluid supply channel, in the inner cavity of which a spring-loaded plunger with axial locking means is installed, characterized in that inside the housing cavity communicating with the working fluid supply channel , a compensation chamber is formed, communicating with the working chamber by means of a valve assembly, in the axial channel of which a spring-loaded spherical s closure member, a supply of hydraulic fluid to the shut-off body is formed by two communicating axial and radial channels, a compensation chamber is provided with drainage channels communicating with the outside it, and in the working chamber is located in a displacer rod.