RU46320U1 - POWER SHAFT DRIVING CLUTCH - Google Patents

Abstract

The utility model relates to the field of mechanical engineering and tractor engineering and is used in complex machines and machine assemblies in which engine power is distributed among individual working bodies and auxiliary mechanisms.

The clutch for engaging the drive of the power take-off shaft contains a driven and leading coupling half with splines on the inner surface and a movable connecting link. The connecting link is made in the form of a spline shaft, at one end of which at least two annular grooves are made. The coupling halves consist of bushings and hubs with dampers located between them. Moreover, in one of the bushings, conjugated with the end of the shaft, on which the annular grooves are made, at least one fixing ball is placed. And on the sleeve is installed, with the possibility of rotation, a ring with grooves on the inner diameter. The ring fixes, under the action of the elastic element, at least one ball in the annular groove of the splined shaft.

Description

The utility model relates to the field of mechanical engineering and tractor engineering and is used in complex machines and machine assemblies in which engine power is distributed among individual working bodies and auxiliary mechanisms. The most widely used are couplings designed for direct connection of shafts for transmitting torque.

Known clutch switching drive PTO ("Tractors" Belarus "MTZ-100, MTZ-102, MTZ-80A, MTZ-82A: Technical description and instruction manual / Compiled by E.A. Bomberov and others. - Mn. :

Urajay, 1987, pp. 88, 95, Fig. 54, 58). The coupling is a splined shaft of the planetary gearbox ring gear with three annular grooves and a spline sleeve mounted on it, in the hole of which a ball is placed, which is pressed from the outside by a coil spring. The clutch has three fixed positions (synchronous, independent drive and off position). When moving the sleeve, the ball under the influence of the spring is fixed in the grooves of the spline shaft in the specified positions. Depending on the included position, the clutch connects the shaft of the planetary gear reducer to the synchronous drive gear or the gearbox internal shaft for an independent drive.

The disadvantage of this design is that due to various reasons, most often due to manufacturing inaccuracies, or incorrect installation, the alignment of the mating shafts may be impaired. In addition, with increased misalignment of the shafts, and transmission, torque arising large axial forces lead to self-clutch.

The absence of compensating elements (dampers) in the coupling design and the uncontrolled force of pressing the ball with a spiral spring exclude the possibility of using this coupling when connecting shafts when their axles deviate from the coaxial position.

Known safety clutch (USSR patent No. 786929, class F 16 D 9/00, published 07.12.80, Bulletin No. 45) containing a driven and leading coupling half with splines on the inner surface and a movable connecting link made in the form of a splined shaft. Moreover, the driven half-coupling contains a chamber in which a glass with a piston with a shank located in it is placed, and a fusible element is placed between the glass and the piston. This coupling serves to transmit torque from the output shaft, while the fusible element is solid. When the permissible torque value is exceeded, the driven clutch stops abruptly, which causes the release of a large amount of heat, which melts the fusible element, which leads to the clutch shutdown.

This design does not allow it to be used to drive the power take-off shaft when large axial forces occur. In addition, this design does not take into account the possibility of increased misalignment of the shafts.

To eliminate the existing disadvantages, a clutch for turning on the drive of the power take-off shaft is proposed. The connecting link is made in the form of a spline shaft, at one end of which at least two annular grooves are made. The coupling halves consist of bushings and hubs with dampers located between them. Moreover, in one of the bushings, paired with the end of the shaft on which the annular grooves are made, at least one fixing

ball. And on the sleeve is installed, with the possibility of rotation, a ring with grooves on the inner diameter. The ring fixes, under the action of the elastic element, at least one ball in the annular groove of the splined shaft.

New in this design is that at least two annular grooves are made at one end of the spline shaft. The coupling halves consist of bushings and hubs with dampers located between them. Moreover, in one of the bushings, conjugated with the end of the shaft, on which the annular grooves are made, at least one fixing ball is placed. And on the sleeve is installed, with the possibility of rotation, a ring with grooves on the inner diameter. The ring fixes, under the action of the elastic element, at least one ball in the annular groove of the splined shaft.

The proposed design has the following advantages:

- between the bushings and hubs of the coupling halves there are rubber dampers that compensate for the misalignment of the shafts and soften the shocks that occur in the parts during uneven operation of the mechanisms;

- reliable fixation of the balls in the grooves of the splined shaft is carried out by a rigid ring mounted on one of the hubs of the coupling halves and having the ability to rotate to release the ball and return to its original position to fix the ball under the action of an elastic element in the form of a spring ring.

Figure 1 shows the main view in section of the clutch inclusion drive the power take-off shaft.

Figure 2 in a view And shows the device of the fixing element of the balls.

The clutch for turning on the drive of the power take-off shaft (Fig. 1) consists of a leading 1 and a driven 2 half-couplings, consisting of bushings 3, hubs 4 and rubber dampers 5 located between them, as well as a splined shaft half-coupling installed in the splines of the sleeve of the driving 1 half-clutch 6 s

two annular grooves B and C at the end associated with the sleeve 3 of the leading 1 coupling half. The locking element is located on the sleeve 3 of the driving 1 coupling half and is made in the form of a retaining ring 7 mounted on the sleeve 3 of the driving 1 coupling half, an elastic element in the form of a spring ring 8 and two balls 9 located in the holes of the sleeve 3 of the driving 1 coupling half. The leading 1 coupling half on the drive shaft is mounted on the splines and fixed by the locking ring 10.

The device operates as follows.

In the initial position (figure 1), when operation with the drive is not required, the splined shaft 6 is disengaged from the driven 2 coupling half and fixed by balls 9 in the groove B.

To enter the shaft 6 into engagement with the driven 2 coupling half, it is necessary to rotate the ring 7 (figure 2) clockwise by 20 ... 25 ° until the grooves on the inner diameter of the ring 7 align with the axes of the balls 9. In this case, the balls are released, and, therefore, there is the possibility of axial movement of the splined shaft 6. The shaft 6 (Fig. 1) is moved in the axial direction until the groove B coincides with the axes of the balls 9. When combining groove B with the axes of the balls 9, ring 7, under the action of the spring ring 8, returns to its original position and fixes the balls 9 into the groove B. In this case, is provided rigid fixation of the driven shaft 6 in the coupling half 2, which excludes its spontaneous disconnection.

The presence of elastic elements in expansion joints, as well as gaps in spline joints, allows coupling of the driving and driven shafts when their axes deviate from the coaxial position.

Claims (1)

A clutch for engaging a power take-off shaft drive, comprising a driven and driving coupling half with splines on the inner surface and a movable connecting link made in the form of a splined shaft, characterized in that at least two annular grooves are made at one end of the splined shaft, and the coupling halves consist of bushings and hubs with dampers located between them, and at least one fixing ball is placed in one of the bushings mating with the end of the shaft on which the annular grooves are made, and it is possible to install on the bush with awn rotation ring with the grooves on the inner diameter, the fixing by the action of the elastic element, at least one annular groove in the ball spline shaft.