RU206360U1 - CAR ENGINE CHAIN TENSIONER DOGGER - Google Patents

Abstract

The utility model relates to the constituent elements of devices that ensure the normal operation of machines and installations, namely, to the constituent parts of devices for changing the tension of the chains (tensioner pawls), and can be used in automobile engines. The technical result of the utility model is a more reliable prevention of displacement of the compression spring from the specified technical result is achieved due to the fact that the declared pawl of the car engine chain tensioner, which is a swinging two-armed lever with a through hole for the swing axis, and in the the second end of the pawl has teeth, characterized in that the end of the pawl, intended for abutting against the compression spring, has at least two spring displacement stops located outside the outer diameter of the pawl compression spring.

Description

The utility model refers to the constituent elements of devices that ensure the normal operation of machines and installations, namely, to the constituent parts of devices for changing the tension of chains (tensioner pawls), and can be used in car engines.

The main types of tensioners are known: hydraulic, mechanical and hydromechanical.

Known car engine chain tensioner (RF patent for utility model No. 104268 IPC F16H 7/08, publ. 05/10/2011), characterized in that it contains a cylindrical body with a flange for attaching the tensioner to the engine, in the central hole of the body is movably installed along it the rod, in the middle part of the rod along its length, a recess is made with teeth interacting with a rotary spring-loaded dog installed on the axis in the slot of the body, one end of the rod has a thickening for its interaction with the chain tensioning element, the other end of the rod interacts with the slider installed in the central hole of the body , on which the tensioner spring is located with the possibility of movement of the slider in it, the slider and the spring are located in a nest formed by the central hole of the body between the end of the rod and the shoulder, which is made at the end of the central hole, and the spring rests against this shoulder with one end of the spring, the other end of which abuts against the annular stop, made on races the end of the slider placed in the housing, and at the end of the slide extending beyond the housing in the idle position of the tensioner, a hole is made in which a removable check is movably installed.

The closest technical solution is the solution for patent No. 2511764, publ. 04/10/2014, in which the chain tensioner of the car engine contains a cylindrical body with a central hole, a rod with a longitudinal recess with many teeth installed in the central hole, and a slider with an annular protrusion, a working spring and a rotary spring-loaded pawl located in the body and interacting with the teeth of the rod, while one of the ends of the body has a ledge that reduces the diameter of the central hole, the slider interacts with the latter by means of an annular protrusion, and the spring is located on the slider between the ledge of the body and the annular protrusion of the slider with the possibility of moving the slider in it, at the end of which is inoperative the condition of the tensioner has a retainer, the slider has a wear indicator made in the form of the end part of the slider extending beyond the housing, and the wear indicator at a zero degree of chain stretching has a length: l≥lw, where l is the length of the wear indicator; lш is the length of the working stroke of the rod.

The principle of operation of any known tensioner is based on the fact that in order to recharge the tensioner, it is necessary to press on the top of the pawl with a finger and, overcoming the resistance of the compression spring, disengage the teeth of the pawl.

The technical problem of all known solutions is that at the moment the pawl is pressed down to the rod, the compression spring can move to the left, right, down or up, which will not allow the pawl to stand with the pawl's teeth in the teeth of the rod flats, and disrupt the normal operation of the tensioner.

The task of the utility model is to eliminate the indicated technical problems.

The technical result of the utility model is a more reliable prevention of displacement of the compression spring from the end of the pawl in the process of reloading the tensioner.

The specified technical result is achieved due to the fact that the declared dog of the chain tensioner of the car engine, which is a swinging two-armed lever, with a through hole for the swing axis, and in the lever of the dog, one end is made to abut against the compression spring, and teeth are made at the second end of the dog, characterized in that the end of the pawl, intended to abut against the compression spring, has at least two spring bias stops located outside the outer diameter of the pawl compression spring.

It is permissible that the displacement limiters of the compression spring are arranged horizontally.

It is permissible that the displacement limiters of the compression spring are vertically arranged.

It is possible that the compression spring displacement limiters are arranged horizontally and vertically, forming a rectangular contour of the spring displacement limitation.

Brief Description of Drawings

FIG. 1 shows an assembled car engine chain tensioner.

FIG. 2 shows the position of the pawl on the rod teeth in close-up with the pawl spring and the rod spring, with an example of the pawl with horizontal spring displacement limiters.

FIG. 3 shows a cross-sectional view of the chain tensioner of a car engine (side view).

FIG. 4 shows an example of a pawl with vertical spring displacement limiters.

FIG. 5 shows an example of a pawl with horizontal and vertical spring displacement stops.

In the drawings: 1 - flange, 2 - body, 3 - stem, 4 - teeth, 5 - pawl, 6 - pawl axis, 7.1 and 7.2 - horizontal and vertical displacement limiters of the pawl spring, respectively, 8 - pawl compression spring, 9 - tensioner spring, 10 - dog teeth, 11 - bracket.

Implementation of the utility model

The tensioner contains a cylindrical body 2, to which the flange 1 is rigidly connected (see Fig. 1). In the central hole of the body 2, a rod 3 is movably mounted along the body, in the middle part of which a recess is made along the length of the rod, in which a flat is formed with a plurality of teeth 4 of the rod, which, during the operation of the tensioner, interact with the pawl 5 located on the axis 6 (see Fig. 2) turning the dog. The dog 5 is located in the longitudinal, parallel to the axis of the body 2, the slot of the body. The pawl 5 forms a swinging two-armed lever, one end of which is spring-loaded by a compression spring 8 in such a way that the second end of the pawl 5 is constantly pressed against the teeth 4 of the rod 3. The teeth 4 are located between the pawl's pivot axis 6 and the longitudinal axis of the housing 2.

The tensioner slider can be made, for example, in the form of a bracket 11 (see Fig. 3), the ends of the whiskers of which are bent and hooked over the edges of the tensioner spring 9. In this case, the ends of the mustache staples 11 abut against the end of the rod 3.

The slider bracket 11 can be made, for example, in the form of a shape-retaining wire. Thus, the fixation of the staples 11 at the edges of the spring 9 will be more stable.

During the operation of the tensioner, during the movement of the rod 3 from left to right, its teeth 4 act on the pawl 5, which rotates at a small angle around the axis 6 counterclockwise, compressing the spring 8 (see Fig. 3). The movement of the rod 2 in the opposite direction is blocked by the tensioner spring 9, which constantly presses the end of the pawl 5 against the rod 3 and brings this end into engagement with the teeth 4 of the rod.

What is new is that the end of the pawl 5, which is spring-loaded by the compression spring 8, has at least two spring bias stops 7.1 and / or 7.2, located at a distance from each other greater than the outer diameter of the pawl compression spring 8.

Displacement limiters of the compression spring 8 can be made horizontally disposed 7.1 (see Fig. 2), or vertically disposed 7.2 (see Fig. 4), or both can be present at the same time, as shown in Fig. 5, forming a rectangular contour of limiting the displacement of the spring 8.

The principle of operation of the tensioner is based on the fact that to recharge the tensioner, you must press your finger on the upper part of the pawl 5 and, overcoming the resistance of the compression spring 8, disengage the teeth 4 of the pawl 5.

At the moment of pressing the pawl 5 down to the rod 3, the compression spring 8 without the presence of stops 7.1 and / or 7.2 can move to the left, right, down or up, which will not allow the pawl to stand with the teeth 10 of the pawl 5 in the teeth 4 of the flats of the rod 3, and will break normal operation of the tensioner. The displacement of the spring 8 (without the presence of stops 7.1 and / or 7.2) occurs when it is bent by an arc at the moment of pressing with a finger on the upper part of the pawl 5. The top of the bend of the spring 8 in the absence of a stop can spring the end (also without a stop) in any direction: top , bottom, right, left.

Horizontally 7.1 and vertically 7.2 positioned limiters located outside the outer diameter of the compression spring 8 of the pawl 5 create a coverage of the end of the spring 8, which makes it possible to provide either the stop of the top of the bend of the spring 8, or the stop of the end of the spring against them.

In this case, the horizontally located stops 7.1 prevent the full displacement of the compression spring 8 up and down and partially prevent the displacement of the spring 8 to the left and to the right. And the vertically located stops 7.2 prevent the full displacement of the compression spring 8 to the left and right and partially prevent the spring 8 from displacing up and down. When used in the pawl 5 and horizontally disposed 7.1 and vertically disposed 7.2 displacement limiters of the compression spring 8, forming a rectangular contour to limit displacement of the spring 8, complete prevention of displacement of the spring 8 in all directions is ensured.

Thus, due to the fact that the end of the pawl intended to abut against the compression spring 8 has at least two spring displacement stops 7.1 or 7.2 located outside the outer diameter of the compression spring 8 of the pawl 5, a more reliable prevention of the compression spring 8 from displacing end of the pawl in the process of reloading the tensioner.

Claims (4)

1. The dog of the chain tensioner of the car engine, which is a swinging two-armed lever with a through hole for the swing axis, and in the lever of the dog, one end is made to rest against the compression spring, and teeth are made at the second end of the dog, characterized in that the end of the dog is intended for the stop in the compression spring has at least two spring displacement stops located outside the outer diameter of the pawl compression spring. 2. The pawl according to claim. 1, characterized in that the displacement limiters of the compression spring are arranged horizontally. 3. The pawl according to claim 1, characterized in that the compression spring displacement limiters are vertically arranged. 4. The pawl according to claim 1, characterized in that the compression spring displacement limiters are arranged horizontally and vertically, forming a rectangular contour of the spring displacement limit.

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