RU2281426C2 - Internal combustion engine camshaft chain tension adjuster - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engines.

SUBSTANCE: invention relates to camshaft drive tension adjusters. Proposed chain tension adjuster of engine camshaft has housing, drive axle with spring, and lock. Housing accommodates movable adjusting screw whose inner space is provided with movable axle of drove with spring. Lock is made in form of cap nut turned onto cover. Ball-lock resting of drive axle is installed inside nut. Movable axle of drive is sectional, it upper part has cylindrical form, and lower part is made flat. In operating condition axle of drive is moved under action of rotating spring, one end of which is secured on upper part of drive axle. Flat clock spring is installed in tension adjuster.

EFFECT: provision of automation of chain tensioning, improved reliability of operation of chain tension adjuster.

3 cl, 3 dwg

Description

The invention relates to various structural elements of internal combustion engines of cars and, in particular, to a camshaft and is intended for tensioning its chain.

Known chain tensioner of the camshaft of the internal combustion engine of a mechanical principle of operation, comprising a housing, a spring, a backstop limiting device with a check valve / 1 /.

The main significant disadvantage of the known chain tensioner is its low reliability due to the frequent sagging of the chain.

A mechanical type chain tensioner is also known, comprising a housing, at one end of which there is an adjusting cap lock nut. Inside the housing, on the drive axis, a spring of cylindrical section / 2 / is installed.

The main significant drawback of this technical solution chosen by the author for the prototype of the claimed invention is the frequent need to control the chain tension, which affects the reliability of the device.

The main task solved by this invention is the elimination of the above disadvantages, improving the reliability of the tensioner, automation of the chain tension process.

The camshaft chain tensioner of an internal combustion engine comprising a housing, an actuator axis with a spring and a latch according to the invention is characterized in that a movable adjusting screw is installed inside the housing, the inner cavity of which is provided with a movable axis of the actuator with a spring. The latch is made in the form of a cap nut, screwed onto the housing cover; inside the nut, a locking ball is mounted, resting on the axis of the drive. The movable axis of the drive is made of a composite section, the upper part of which is cylindrical and the lower part is flat, in the working state, the axis of the drive moves from the rotation of the spring, one of the ends of which is fixed to the tensioner housing, and the other end of the spring is mounted on the upper part of the axis of the drive. A tension spring of a flat-type watch type is installed in the tensioner.

The new significant features described above are not found in well-known chain tensioners of a similar purpose either in the practice of the automotive industry or in patent technical sources. All the inherent features of this invention are sufficient to implement the invention, and each separately is necessary.

It is legitimate to conclude that the claimed technical solution meets the criteria of novelty and inventive step.

All inherent essential features of the claimed technical solution provide its repeated use, which fully meets the criterion of industrial applicability.

Thus, the conclusion about the conformity of the claimed technical solution to the invention is valid.

The proposed technical essence of the new technical solution is illustrated in the drawing, where:

- figure 1 shows a General view of the tensioner (in section),

- figure 2 shows a section of the lower part of the axis of the drive tensioner,

- figure 3 shows the tensioner in the working position (in section).

The tensioner consists of a housing 1 (Fig. 1), inside of which a movable adjusting screw 2 is installed. The internal cavity of the movable screw is provided with a movable axis of the drive 3. A spring 5 is installed in the expanded upper part of the housing 4, one end of which is fixed to the housing and the other to drive axis 3. The clock-type spring 5 has a flat section. The axis of the actuator 3 (Fig. 1 and Fig. 2) is made of a composite section and has a cylindrical shape in the upper part and a flat one in the lower part (Fig. 2). To limit the movement of the axis of the drive, it is based on a support washer 6 (figures 1 and 3). In the upper part of the housing, a latch is installed, made in the form of a cap nut 7 (Fig. 1), turned onto the threaded part of the neck 8 of the tensioner body until it stops against the locking ball 9 located in the cap nut, with the end part of the drive axis 3.

The tensioner works as follows.

Turning the adjusting screw 2 (Fig. 3) through the axis of the actuator 3, a spring 5 is twisted, which is locked with a cap nut 7, which presses on the ball-retainer 9. The latch, in turn, presses on the end of the axis of the actuator 3, the axis loses its mobility, pressing against the protrusion to the supporting washer 6 (figure 3). After installing the tensioner, the retainer ball is removed, and the cap nut is screwed into place, eliminating oil leakage. Without a retaining ball, the twisted cap nut with its bottom does not reach the drive axis. The released axis of the actuator 3, driven by a spring 5, loosens the screw, choosing a clearance. A spring 5 of large length unscrews the screw with almost the same force for a given distance. The spring force, thread pitch and vibration of a working internal combustion engine create on the screw the required force and reliable operation of the tensioner, which practically works in automatic mode.

The work of the tensioner of the claimed design is tested in the form of a prototype on a passenger car brand "Lada". Received positive results. During operation, no wear of the tensioner parts was revealed.

Information sources

1. A.E. Khrulev. Engine repair of foreign cars. M., “At the wheel”, 1998, p.76.

2. Cars "Lada" VAZ-2104, 2105, 2107. Device, repair. M., Transport, 1991, p.29.

Claims (3)

1. The camshaft chain tensioner of an internal combustion engine, comprising a housing, an actuator axis with a spring and a latch, characterized in that a movable adjusting screw is installed inside the housing, the inner cavity of which is provided with a movable axis of the actuator with a spring, and the latch is made in the form of a cap nut screwed on the housing cover, inside the nut, a locking ball is mounted, resting on the axis of the drive. 2. The tensioner according to claim 1, characterized in that the movable axis of the drive is made of a composite section, the upper part of which is cylindrical, and the lower is flat, in the working state the axis of the drive moves from the rotation of the spring, one of the ends of which is fixed to the tensioner housing, and the other end of the spring is mounted on the top of the drive axis. 3. The tensioner according to claim 1, characterized in that a watch-type spring of a flat shape is installed in it.

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