RU2815177C1 - Tensioning device for transmission with flexible traction - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to tensioners of flexible transmissions. Tensioner for transfer with flexible rod comprises adjusting working eccentric with longitudinal hole, working eccentric, rolling bearing, tensioning roller, spring. In addition, the working eccentric is based in the inner hole of the sliding bearing and provides sliding along the outer surface of the adjusting eccentric, tensioning roller is made together with rolling bearing with formation of two flanges and cylindrical keys. Support plate is made in the form of an adjusting washer made with a round mounting hole, and is fixed on the external surface of the adjusting eccentric by press fit. In addition, it is stamped against displacement in four points, one end of the spring is fixed in the groove of the working eccentric, and the second end is in the hole of the adjusting washer.

EFFECT: improved operating properties of the tensioning device.

1 cl, 5 dwg

Description

The invention relates to a tensioning device for transmissions with flexible traction, in particular to internal combustion engines (ICE).

A tensioning device for a transmission with a flexible rod is known (RF patent No. 2395020, IPC F16H 7/12, published on July 20, 2010), including a spring means, which is fixed at one end in place on the working eccentric, and at the other end on the base plate . For this purpose, the base plate is non-rotating and fixed in place by a connecting element with an adjusting eccentric. For smooth operation, the tensioner is equipped with a plain bearing shell, a ring with an internal groove and an extension.

A tension mechanism is known (RF patent No. 2560207, IPC F16H 7/12, published on August 20, 2015), containing a coupling, a regulator jointly connected to the inner surface of the coupling, a hinged lever pivotally connected to the coupling, a pulley mounted on one axis with an articulating arm, a torsion spring engaged with the clutch to displace the articulating arm, and a locking element attached to the adjuster and cooperatively engaging with the clutch. In addition, the tensioning mechanism includes an elastomeric damping ring connected to the lever and in compressed frictional contact between the clutch and the lever.

In known tensioning devices, the working eccentric is made of metal by casting and subsequent machining. Moreover, another part is installed between the working eccentric and the adjusting eccentric - an insert in the form of a split metal fluoroplastic bushing, which acts as a sliding bearing and prevents friction between metal surfaces. Additional parts in devices complicate the design, increase the cost, increase the complexity of the product and reduce the reliability of their operation.

The technical objective of the invention is to improve its performance properties while simultaneously reducing labor costs and the cost of its production.

The essence of the proposed device is as follows.

The invention claims a tensioning device for a transmission with a flexible rod, containing an adjusting working eccentric with a longitudinal hole, a working eccentric, a rolling bearing, a tension roller, a spring, characterized in that the working eccentric is based in the inner hole of the plain bearing and ensures sliding along the outer surface of the adjusting eccentric, tension the roller is made together with a rolling bearing to form two flanges and cylindrical keys, the support plate is made in the form of an adjusting washer made with a round mounting hole and is fixed on the outer surface of the adjusting eccentric by a press fit and caulked against displacement at four points, the spring is fixed at one end in groove of the working eccentric, and the other end into the hole of the adjusting washer.

In addition, the working eccentric and tension roller are made of engineering plastics by injection molding using a thermoplastic machine and do not require further machining. At the same time, the working eccentric, made of engineering plastic, eliminates friction of metal surfaces and, accordingly, eliminates the use of a sliding bearing.

The use of the proposed invention provides the following technical result: improving its operational properties while simultaneously reducing labor costs and the cost of its production.

The design of the tensioning device is shown in the figures.

Fig. 1 - design of the tension device;

Fig. 2 - adjusting eccentric of the tension device;

Fig. 3 - adjusting plate of the tension device;

Fig. 4 - working eccentric assembly;

Fig. 5 - working eccentric.

In the figures, the following elements are designated by positions:

1 - car body.

2 - flexible rod.

3 - adjusting eccentric.

4 - longitudinal hole of the adjusting eccentric.

5 - fixing screw.

6 - flanging.

7 - cylindrical key.

8 - groove for fixing the spring.

9 - end surface of the car body.

10 - end surface of the adjusting eccentric.

11 - working eccentric.

12 - rolling bearing.

13 - tension roller.

14 - spring.

15 - end of the spring.

16 - end of the spring.

17 - adjusting washer.

18 - outer landing surface.

19 - places of caulking.

20 - hole of the adjusting washer.

21 - hole for fixing the spring.

The manufacture of the device is carried out as follows. First, the tension roller 13 is made from engineering plastics by injection molding on a thermoplastic machine together with a rolling bearing 12. Then a working eccentric is made on a thermoplastic machine. The spring 14 is made using the winding method. The adjusting washer 17 and the adjusting eccentric 3 are made using the stamping method.

The assembly of the device is carried out as follows.

A working eccentric 11 is installed in the tension roller 13, and an adjusting eccentric 3 is inserted into the hole of the working eccentric. The resulting assembly is installed on a special assembly device on the table of a hydraulic press. A spring 14 is attached to the working eccentric, the end of the spring 15 is installed in the groove for fixing the spring 8. The adjusting washer 17 is attached to the spring, while the end of the spring 16 is installed in the hole for fixing the spring 21. Next, the adjusting washer 17, with a press, is pre-pressed towards the adjusting eccentric 3, pressing spring 14. Using a special assembly device, the adjusting washer 17 is rotated until the outer seating surface 18 of the adjusting eccentric 3 is aligned with the hole of the adjusting washer 20, while the adjusting washer 17, based on the hole 20 along the outer seating surface 1 8 of the adjusting eccentric 3, is pressed onto adjusting eccentric 3. The resulting assembly is caulked against displacement in the caulking areas 19.

The device works as follows. The assembled tension device is installed on the car body with the end surface of the adjusting eccentric 10 to the end surface of the car body 9 using a fastening screw 5 inserted through the longitudinal hole of the adjusting eccentric 4. In this case, the fastening screw 5 is not pre-tightened. Using a special key, you turn the adjusting washer 17, which is connected to the adjusting eccentric 3 and turns the adjusting eccentric 3 behind itself. The adjusting eccentric 3 moves the working eccentric 11, and the working eccentric 11 moves the tension roller 13, tensioning the flexible rod 2 to the required level. After this, the mounting screw 5 is tightened. The tension roller 13 rolls along the flexible rod 2 due to the rolling bearing 12, and is not subject to axial displacement due to the flanges 6 and cylindrical keys 7.

The proposed design makes it possible to improve the operational properties of the tensioning device, reduce the cost of the product, reduce labor costs and the total time for its manufacture.

Claims (2)

1. A tensioning device for a transmission with a flexible rod, containing an adjusting working eccentric with a longitudinal hole, a working eccentric, a rolling bearing, a tension roller, a spring, characterized in that the working eccentric is based in the inner hole of the plain bearing and ensures sliding along the outer surface of the adjusting eccentric, the tension roller is made together with a rolling bearing to form two flanges and cylindrical keys, the support plate is made in the form of an adjusting washer made with a round mounting hole, and is fixed on the outer surface of the adjusting eccentric by a press fit, and is caulked against displacement at four points, the spring is one the end is fixed in the groove of the working eccentric, and the other end - in the hole of the adjusting washer. 2. Tensioner according to claim 1, characterized in that the working eccentric and tension roller are made of engineering plastics by injection molding using a thermoplastic machine and do not require further machining.

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