RU199405U1 - CAMSHAFT SPROCKET WITH PHASE ADJUSTMENT - Google Patents

Abstract

The utility model relates to mechanical engineering, in particular to a device for setting the valve timing of an internal combustion engine with a chain drive of a camshaft. The technical result is simplicity in manufacture, simplification of use and the ability to make the adjustment as accurately as possible. The camshaft sprocket (1) with the possibility of adjusting the phases contains teeth (3) and is designed to be mounted on the toe of the camshaft. The sprocket has a separate perforated flange. The sprocket has a groove (2) and is made in the form of a one-piece round piece with teeth, in the central part of which there are circular recesses (4, 7) on both sides. In the center of the round grooves there is a hole (5) for attaching to the camshaft nose and a hole (6) for a key. Moreover, the holes (5, 6) in the sprocket are made in the area of the recesses. The perforated flange is made in the form of a removable pressure washer (8). The pressure washer has a central hole (10) and a hole (9) for a key, and is also designed to be inserted into the recess (4) and positioned along the groove in the sprocket.

Description

The utility model relates to mechanical engineering, in particular to a device for setting the valve timing of an internal combustion engine with a camshaft chain drive.

Known device for setting valve timing with a chain drive of the camshaft, containing an adjusting clutch with threaded holes around the circumference. By means of the clutch, the sprocket of the chain drive is attached to the camshaft by pressing it with the clutch using bolts to its end. Due to the retainers screwed into the threaded holes of the coupling and entering the holes of the sprocket located circumferentially inside its gear rim, the sprocket is fixed [US3734073, publ .: 05/22/1973.].

The disadvantage of such a device is that it does not allow to perform, if necessary, an asterisk with small dimensions in diameter, because this is limited to the latch holes.

In addition, due to the presence of separate elements for attaching the sprocket to the camshaft and its fixation and adjustment, the operation of adjusting and setting the valve timing is complicated. To carry it out, it is necessary to unscrew the clamps and unscrew the bolts.

Known camshaft split stars, for example, [http://bon74.ru/Razreznye-zvezdy-raspredvala-transportir-faz-ZMZ-409-PRO].

A technical problem with this kind of stars is the potential for slippage and cranking.

These problems are eliminated in the patent RU2063522, publ .: 10.07.1996., Which describes a device for setting the valve timing of an internal combustion engine, containing a camshaft, a chain drive sprocket mounted on the toe of the camshaft, and a clutch with adjusting holes, characterized by that the sprocket is equipped with a separate flange with adjusting holes, through which it is connected to the clutch, and the latter is directly attached to the camshaft.

This decision was made for a prototype.

The technical problem of the prototype is the complexity of manufacture (the need for multiple holes), and the complexity of use, which is due to the fact that step adjustment is carried out (it is impossible to make the adjustment as accurate as possible). Errors can occur when adjusting the phases when trying to bolt through the wrong holes, which seem to be the same, but de facto are not.

The task of the utility model is to eliminate the shortcomings of the prototype and other known solutions.

The technical result is ease of manufacture, ease of use and the ability to make the adjustment as accurately as possible.

The specified technical result is achieved due to the fact that the claimed camshaft sprocket with the possibility of adjusting the phases, containing teeth and made with the possibility of installation on the toe of the camshaft, while the sprocket is equipped with a separate flange with holes, characterized in that the sprocket has a groove and is made in the form a one-piece round part with teeth, in the central part of which there are circular recesses on both sides, in the center of which there is a hole for mounting on the toe of the camshaft and a hole for the key, and these holes in the sprocket are made in the area of the recesses, and the flange with holes is made in the form a removable hold-down washer, which has a central hole and a key hole, and is also designed to be inserted into the recess area and positioned along the groove in the sprocket.

The key hole in the sprocket can be made round.

The key hole in the sprocket can be made in the form of a rectangular slot. In this case, the edges of the rectangular slot can be rounded.

Brief description of the drawings.

Figure 1 shows a disassembled camshaft sprocket device (views in different projections).

Figure 2 shows a disassembled camshaft sprocket device with a rectangular hole for a key, where the edges of the slot are rounded (volume view).

Figure 3 shows the camshaft sprocket device without a pressure washer with other examples of the shape of the holes for the key (a - view with a rectangular hole for the key; b - view with a round hole for the key).

Figure 4 shows the camshaft sprocket device assembled with the installed pressure washer (volume view).

In the drawings: 1 - sprocket, 2 - groove, 3 - teeth, 4 - notch on the side of the pressure washer, 5 - central hole in the sprocket, 6 - hole for the key in the sprocket, 7 - notch on the opposite side of the pressure washer, 8 - hold-down washer, 9 - key hole in the hold-down washer, 10 - central hole in the hold-down washer.

Implementation of the utility model.

The declared sprocket consists of two parts - the sprocket itself 1 and the pressure washer 8 (see Fig. 1).

The camshaft sprocket has the ability to adjust the phases and contains a flange with holes.

What is new is that the sprocket 1 has a groove 2 and is made in the form of a round part with teeth 3. In the central part of the sprocket 1 there are round recesses 4 and 7 on both sides, in the center of which there is a hole 5 for mounting on the camshaft toe and hole 6 under the key. Holes 5 and 6 in the sprocket 1 are made in the area of the recesses 4 and 7.

And the flange with holes is made in the form of a removable pressure washer 8, which has a central hole 10 and a hole 9 for a key. In addition, the pressure washer 8 is designed to be inserted into the recess area 4 and positioned along the recess 2 in the sprocket 1.

The principle of operation of the device is as follows.

Sprocket 1 is put on by hole 5 on the camshaft nose. In the place where the key is located on the camshaft, a groove 2 is made on the sprocket 1, which is sufficient so that the sprocket 1 can rotate about the axis of the hole 5 within the key by at least an angle equal to the angle of the tooth 3 of the sprocket.

Further, a pressure washer 8 is inserted into the recess 4 as shown in Fig. 4. Washer 8 is made in such a way that it is positioned along the groove 2 in the sprocket 1 and at the same time also has a hole 9 for the key.

The recess 4 is necessary for the possibility of laying the pressure washer 8. And the recess 7 on the opposite side of the sprocket 1 is needed for the possibility of a snug fit to the toe of the camshaft, the possibility of axial positioning and at the same time free rotation on it.

With the camshaft fastening bolt, the pressure washer 8 presses the sprocket 1 to the camshaft (not shown in the drawings). The sprocket is installed on the camshaft at the mark. If, after tensioning the chain or after stretching the chain, the phase needs to be adjusted, the sprocket mounting bolt is loosened and it becomes possible to turn the camshaft within the slot 6 for the key on the sprocket. This is sufficient for the optimum setting of the camshaft position.

Thus, in comparison with the prototype, the process of adjusting the phases in the sprocket is simpler and faster than in the prototype and allows you to make the adjustment as accurately as possible, eliminating the errors that may occur when adjusting the phases when they try to bolt through the wrongly selected holes, which seem to be the same, but de facto they are not.

Based on this, depending on the goals and objectives of adjusting the offset angle, the size and shape of the key, the hole 6 for the key in the sprocket can be made round, as shown in Fig. 3 (b) or in the form of a rectangular slot as shown in Fig. 3 (and). In this case, the edges of the rectangular slot can be rounded, as shown in Fig. 1 or Fig. 2.

Due to the fact that, in contrast to the prototype, it is possible to replace the production of a plurality of adjusting holes with only one slot 6, a simple part is provided.

Claims (4)

1. A camshaft sprocket with the possibility of adjusting the phases, containing teeth and made with the possibility of installation on the toe of the camshaft, while the sprocket is equipped with a separate flange with holes, characterized in that the sprocket has a groove and is made in the form of a one-piece round piece with teeth, in the central parts of which there are circular recesses on both sides, in the center of which there is a hole for mounting on the toe of the camshaft and a hole for the key, and these holes in the sprocket are made in the area of the recesses, and the flange with holes is made in the form of a removable pressure washer, which has a central hole and a hole for a key, and also made with the possibility of insertion into the notch zone and positioning along the groove in the sprocket. 2. The camshaft sprocket according to claim 1, characterized in that the key hole is made round. 3. The camshaft sprocket according to claim 1, characterized in that the key hole is made in the form of a rectangular slot. 4. A camshaft sprocket according to claim 3, characterized in that the edges of the rectangular slot are rounded.

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