RU196020U1 - WEDDING VARIATOR - Google Patents

Abstract

The inventive utility model relates to agricultural engineering and can be used in the construction of mechanical transmission elements, in particular as part of the threshing drum drive as a driven variator. The technical result is achieved by the fact that the driven variator is mounted on the shaft of the threshing drum and connected to the leading variator by V-belt, including fixed and movable disks with coaxial hubs mutually spring-loaded due to the spring, while movable the disk is equipped with cams, two cams mounted on the fixed disk are introduced into the fixed disk, made in the form of interchangeable pads located at an angle of 180 degrees to each other relative to the axis of rotation of the driven variator, bushings made of polymeric materials and a guide axis, while the cams are fixed with pins and screws, the guide axis is bolted and forms a movable connection with the sleeve, providing synchronous rotation of the movable and fixed disks. The elements of the fixed and movable disks, a spring compressed by a cover that is fixed by a circlip on the hub of the fixed disc, form a block of discs that can rotate on the shaft of the threshing drum due to sliding bearings installed in the inner part of the hub of the fixed disc. rotation of the movable and fixed disks eliminates slipping and turning the belt; placing the guide axis on the big shoulder, ensuring the same clearance between the two teeth of the cam clutch and the cams, allows to reduce critically dangerous loads on the elements of the driven variator during operation and, thereby, increase the resource and increase the reliability of the design.

Description

The inventive utility model relates to agricultural engineering and can be used in the construction of mechanical transmission elements, in particular, as part of the threshing drum drive as a driven variator.

Known driven variator of the harvester RSM-161, which is used in conjunction with a force-controlled (by means of a hydraulic cylinder) leading variator [Combine harvester self-propelled RSM-161. - Manual. - Rostov-on-Don: Rostselmash Combine Plant LLC, 2017]. The driven variator contains fixed and movable disks with coaxial hubs, between which a guide is installed in the form of a key, which ensures synchronous rotation of the disks. The movable disk is spring-loaded relative to the stationary and is equipped with three cams. The elements of the fixed and movable discs with hubs, a spring, a key and overlays form a block of discs, which has the ability to rotate on the throttle drum counter-drive shaft due to sliding bearings installed in the inner part of the fixed disc hub. The movement of the disk block along the counter-drive shaft is limited by a cam clutch fixed on the counter-drive shaft, while the torque is transmitted from the drive variator to the driven disks by a belt, and the movable disk acts on the teeth of the cam clutch due to the cams, thereby rotating the threshing drum counter-drive shaft .

Known variator has the following disadvantages

high required manufacturing accuracy, which increases the cost of the variator;

the need for frequent lubrication with an expensive agent;

the need for a frequent and time-consuming operation of replacing the guide key due to its rapid wear (reducing its resource) from exposure to high loads due to the small location arm;

In the first hours of operation of the driven variator, due to inaccuracy in the manufacture of the elements included in it, the contact of the cams with the cam clutch occurs along one of its three teeth, which creates a significant bending moment acting on the throttle drum counter-drive shaft, as well as increased pressure on the cam.

Closest to the claimed technical solution is a pulley of a V-belt variator [Patent RU 61004 U1, priority 02/10/2007], consisting of mutually spring-loaded fixed and movable disks with coaxial hubs, while the movable disk contains cams, the spring is installed in the cavity of the glass-forming cam clutch installed on the hub of the fixed disk between the nut and the hub of the movable disk with the possibility of interaction with the cams, while the hub of the movable disk is equipped with a sleeve of antifriction material and dry friction.

The disadvantages of the prototype are: low reliability of the variator, since during operation the movable disk rotates relatively motionless, which leads to short-term slipping of the belt and reduces its life or leads to its failure; in the first hours of operation of the driven variator, due to inaccuracy in the manufacture of the elements included in it, the contact of the cams with the cam clutch occurs through one of its three teeth, which creates a significant bending moment that adversely affects the shaft of the threshing drum.

The objective of the utility model is to reduce critically dangerous loads on the structural elements of the driven variator, increase its life and increase reliability during operation.

The technical result is achieved by the fact that in the driven variator mounted on the shaft of the threshing drum and connected to the leading variator by means of a V-belt, it includes a fixed and movable disc with coaxial hubs mutually spring-loaded due to the spring, while the movable disc is equipped with cams, which are stationary two cams mounted on a fixed disk are introduced, made in the form of interchangeable pads, located at an angle of 180 degrees to each other relative to the axis of rotation of the driven A hole, bushings made of polymeric materials and a guide axle, while the cams are fixed with pins and screws, the guide axle is bolted and forms a movable connection with the sleeve, providing synchronous rotation of the movable and fixed disks. The elements of the fixed and movable disks, a spring compressed by a cover, which is fixed by a circlip on the hub of the fixed disc, form a block of discs that can rotate on the shaft of the threshing drum due to sliding bearings installed in the inner part of the hub of the fixed disc. The movement of the disk block along the shaft is limited by two stops made of polymeric materials, a washer installed in the stop of the shaft shoulder, and a cam clutch fixed on the shaft and having two teeth located at an angle of 180 degrees to each other relative to the axis of rotation of the threshing drum shaft, while moving the disk through the cams is in contact with the teeth of the cam clutch, thereby driving the threshing drum shaft. The adjusting plates are made in the form of a U-shaped profile and installed under the cams, which ensures the same clearance between the two teeth of the cam clutch and the cams, while the load on the two teeth of the cam clutch is distributed evenly, which eliminates the impact of critically dangerous bending moments on the shaft of the threshing drum.

The use of a driven variator with synchronous rotation of the movable and fixed disks eliminates slippage and the possibility of a belt overturn. Placing the guide axis on the large arm and ensuring the same clearance between the two teeth of the cam clutch and the cams can reduce the critically dangerous loads on the elements of the driven variator during operation and, thereby, increase the resource and increase the reliability of the design.

The inventive utility model is illustrated by drawings:

FIG. 1 - CVT assembly, left view;

FIG. 2 - driven variator, section AA from FIG. 1;

FIG. 3 - driven variator, section BB of FIG. 1;

FIG. 4 - driven variator, section BB of FIG. 3;

FIG. 5 - U-shaped adjustment plate;

FIG. 6 - driven variator in axonometry (computer graphics).

The inventive device includes the following structural elements (Fig. 1-4): 1 - leading variator; 2 - V-belt; 3 - a shaft of a threshing drum; 4 - driven variator; 5 - a directing axis; 6 - cam clutch; 7 - a movable disk with a hub 8; 9 - a fixed disk with a hub 10; 11 - bolts; 12 - a cover; 13 - a lock ring; 14 - spring; 15 - plain bearing; 16 - disk block; 17 - washer; 18 - flange of the shaft of the threshing drum 3; 19, 20 - stops; 21 - washer; 22 - a nut; 23 - sleeve; 24 - cam; 25 - pins; 26 - screw; 27 - an adjusting plate; 28 - the gap between the tooth 29 of the cam clutch 6 and the cam 24.

The inventive driven variator 4 is mounted on the shaft of the threshing drum 3 and is connected by a V-belt 2 with the leading variator 1. The inventive driven variator 4 contains a movable 7 and a fixed 9 discs with hubs 8 and 10, while the hub 8 with a movable disc 7 can move along the hub 10 the fixed disk 9. On the movable disk 7 in the hole in which the guide axis 5 enters, a sleeve 23 is fixed, while the guide axis 5 is fixed on the fixed disk using bolts 11. The guide axis 5 and the sleeve 23 form a movable connection along the axis of the shaft of the threshing drum 3 and relative to it, the rotation of the movable disk 7 relative to the stationary 9 is limited. A spring is installed between the movable disk 7 and the cover 12, while the cover is fixed by the locking ring 13 on the hub 10. Thus, the movable disk 7 is spring-loaded relative to the fixed disk 9 and assembled they form a block of disks 16, which is mounted on the shaft of the threshing drum 3 using sliding bearings 15 installed in the hub 10. The block of disks 16 is limited in movement along the axis of the threshing shaft of the drum 3 on one side with a stop 19 and a ring 17, which abuts against the flange 18 of the shaft of the threshing drum 3, on the other hand, with a stop 20 and a cam clutch 6 fixed on the shaft of the threshing drum 3 with the washer 21 and nut 22. The angle the rotation of the disk block 16 around the shaft axis of the threshing drum 3 is provided by two teeth 29 of the cam clutch 6, which are in contact with two cams 24 mounted on the movable disk 7 using pins 25 and screws 26. The gap 28 between the teeth 29 and cams 24 is provided by the installation not the required number of adjusting plates 27 for the cams 24.

The device operates as follows. By means of the V-belt 2 (see Fig. 1), the torque is transmitted from the drive variator 1 to the driven variator 4. With increasing torque on the shaft of the threshing drum 3 during operation, the teeth 29 of the cam clutch 6 come into interaction with the cams 24 (see Fig. 3), which creates axial force on the movable disk 7 and drives the block of disks 16 (see Fig. . 2). In this case, the disk block 16 is limited in axial movement by the stop 19 and the ring 17 installed in the flange 18, but rotates relative to the axis of the shaft of the threshing drum 3 by an amount proportional to the movement of the teeth 29 of the cam clutch 6 along the cams 24. The V-belt 2 does not slip due to axial clamping between the movable 7 and the stationary 9 disks, and also due to the absence of their rotation relative to each other by means of the guide axis 5 and the sleeve 23, forming a movable connection along the axis of the threshing shaft about drum 3 (see Fig. 1-4).

To ensure the same clearance 28 (see Fig. 3) between the cams 24 and the teeth 29 of the cam clutch 6, the shaft of the threshing drum 3 is fixed, preventing its rotation. When the disk block 16 is rotated around the axis of the shaft of the threshing drum 3, one of the two contacts of the tooth 29 of the cam clutch 6 and the cam 24 takes place. At the same time, at the place where the second contact between the tooth 29 of the cam clutch 6 and the cam 24 does not occur, the gap 28 is measured. , and its value determines the number of necessary adjusting plates 27, which are further placed under the cam 24 (see Fig. 3, 4).

The technical result consists in the fact that the use of a driven variator with synchronous rotation of the movable and fixed disks eliminates slipping and turning the belt; placing the guide axis on the big shoulder, ensuring the same clearance between the two teeth of the cam clutch and the cams, allows to reduce critically dangerous loads on the elements of the driven variator during operation and, thereby, increase the resource and increase the reliability of the design.

Claims (4)

1. V-belt variator, including a driven variator mounted on the shaft of the threshing drum and connected to the leading variator by means of a V-belt, including a fixed and movable disc with coaxial hubs mutually spring-loaded due to the spring, while the movable disk is equipped with cams, characterized in that in the composition of the fixed disk two cams fixed on the fixed disk are made, made in the form of interchangeable pads, located at an angle of 180 degrees to each other relative to the axis of rotation The drive variator, bushings made of polymeric materials and a guide axis, while the cams are fixed with pins and screws, the guide axis is bolted and forms a movable connection with the sleeve, providing synchronous rotation of the movable and fixed disks. 2. V-belt variator according to claim 1, characterized in that the elements of the fixed and movable disks, a spring compressed by a cover, fixed by a locking ring on the hub of the fixed disk, form a disk block that can rotate on the threshing drum shaft, due to the installed sliding bearings in the inside of the hub of the fixed disk. 3. V-belt variator according to claim 1, characterized in that the movement of the disk block along the shaft is limited by two stops made of polymeric materials, a washer mounted against the shaft shoulder, and a cam clutch fixed on the shaft and having two teeth located at an angle of 180 degrees to each other relative to the axis of rotation of the shaft of the threshing drum. 4. V-belt variator according to claim 1, characterized in that the adjustment plates are made in the form of a U-shaped profile and installed under the cams, providing the same clearance between the two teeth of the cam clutch and the cams.

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