SU1004088A1 - Power nut driver - Google Patents

Description

The invention relates to a mechanized tool for assembling threaded connections and tightening them with tared torque, namely, nut wrenches, and can be used to mechanize the fitting and assembly work in various parts of the jets.

A wrench is known, comprising a housing located in a thruster, a three-stage planetary gearbox, a spindle with a working head and a spindle speed switching mechanism, including a cam clutch, the driving coupling half of which is rigidly fixed on the speed reducer of the second gear reducer, and the coupling coupling has been installed. is inserted on the spindle with the possibility of axial movement 11.

The disadvantage of this wrench is that when switching the spindle speed, when one of the clutches has not fully disengaged, and the second clutch is partially engaged, the spindle is wedged, as the second clutch is in engagement with the housing.

Its closest to the invention is a wrench, comprising a housing housed in it, a motor, a three-stage planetary gear, a spindle with a working head at the end, and a switching mechanism for the rotational speed of the spindle in the form of a clutch, which includes a rigidly mounted on the second stage carrier gearbox leading gear half coupling, spring-loaded driven gear half coupling, installed on

10 spindle, and the host drove. the third stage of the gearbox with spindle-lem when transmitting the limiting torque 2

The switching unit of the carrier of the third stage of the reducer with a spindle includes a separator with rolling elements that interact with annular grooves made on the outer surface of the driven coupling half and arc

20 grooves located on the inner surface of the carrier of the third stage of the gearbox.

The disadvantage of this wrench lies in the fact that when the maximum torque clutch is triggered. It is not ensured that the half couplings are fully disengaged, which leads to wear of the working surfaces of the coupling half teeth.

The purpose of the invention is to increase the torque of the wrench.

The goal is achieved by the fact that in a wrench containing a housing, a three-stage planetary gear spindle with a working head at the end, and a spindle speed switching mechanism in the form of a torque limiting clutch, including a fixed gear half-coupling fixed on a second gear stage, spring loaded the driven gear half coupling mounted on the spindle and the switch-on unit drove the third stage of the reducer with the spins in the transmission of the limiting torque, The coupling half is also rotatable relative to the spindle axis, and the switch-on unit has a one-sided torque limit clutch, the gear half of which is made in one piece with the carrier of the third stage of the gearbox, the gear half of the clutch which is installed on the driven half coupling with the possibility of axial displacement : Yushena in the direction of the spindle and has two diametrically positioned teeth on the free end, and in the form of a spring-loaded disk on the spindle with holes on the spindle tnym: the teeth of the driven coupling half way clutch torque limit.

FIG. 1 shows a wrench, a longitudinal section in FIG. 2 is a view A of FIG. one; in fig. 3 is a view B in FIG. 1} on. ({IG. 4 - view C in Fig. 1 in Fig. 5 - a wrench at the moment corresponding to the operation when transmitting a torque limit; Fig. B - view D in Fig. 5 in Fig. 7 D in Fig. 5.

The wrench contains a housing 1, in which the engine 2 is located, a three-stage gearbox 3, a spindle 4 with a working head 5 at the end and a switching mechanism for the rotational speeds of the spindle in the form of a torque limiting clutch, including a rigid gear on the second stage gearbox 3 of the leading toothed semi clutch 7, a spring-loaded driven gear half coupling 8, having a shank 9 with multiple threads 10, which is inserted into a reciprocal threaded hole 11, made in spindle 4, external splines 12, and a turn-on unit drove the third stage 13 unit 3 with spindle 4 when transmitting the limiting torque The switch-on unit drove 13 with spindle 4 has a one-way limit torque clutch, the leading gear coupling half 14 which is made in one piece with the carrier 13 of the third gear reducer 3, driven by the half coupling half 15 mounted on the driven half coupling 8 with the possibility of axial movement due to the splines 16, the response splines 12 of the driven half-coupling 8, is pressed by the spring 17 towards the spindle 4 and has two diametrically positioned teeth 18 on the free end, and in the form of disk 19 with end cavities 20, reciprocating teeth 18 m driven coupling half 15. disk 19 is preloaded by spring 21 in the direction of driven coupling 15, the force of which is more spring force 17. The disk 19 is fixed on spindle 4 by means of a pin 22 entering groove 23, made in the disk and limiting its axial movement. The driven gear coupling half 8 is pressed in the direction of the leading coupling half 7 by the pruzkina 24.

The wrench works as follows.

When taiki (not shown) of the assembled threaded joint is tapped, the torque is small and is transmitted from the engine 2 through the first and second stages of the gearbox 3 to the spindle 4 (via the torque limit clutch) at a higher speed.

With further tightening of the nut, the torque increases, and the clutch of the limiting moment due to the inclination of the teeth begins to disengage. In this case, her knowledge of the coupling half B / overcoming the resistance of the spindle 24, with its shank 9 is screwed into the threaded hole 11 of the spindle 4, together with the driven gear coupling half 8 also begins to turn the driven half coupling 15, the end teeth of which 18 begin to slide relative to their corresponding depressions 20, as a result, the driven coupling half 15 begins to move toward the leading coupling half 14, compressing the spring 17 until their teeth engage. At the same time, the driven gear half coupling 8 completely disengages from the leading coupling half 7, and the end teeth 1B of the driven half coupling 15 are in contact with the face depressions 20 of the disk 19. As a result, the spindle 4 begins to rotate at a reduced speed, getting rotation from engine 2 through the first, second stage of the gearbox 3 and drove 13 of its third stage, through a one-way clutch of the limit ms tape and a disk 19 meshed with the front teeth 18 of the driven half-coupling 15.

Upon reaching the limiting tightening torque of the threaded joint, the end hollows 20 of dal1sk 19 begin to slide relative to the end teeth 18 of the driven half coupling 15, as a result of which the disk 19, compressing the spring 21, begins to move

in the direction of the spindle 4 to the full exit of the teeth 18 from its end depressions 20. The rotation of the spindle stops. Then, the next nut is screwed in the sequence described.

By changing the design of the switching unit of the third stage gearbox with a spindle and installing the driven coupling half in the spindle, the durability of the wrench can also be rotated about its axis. Invention Formula

A wrench comprising a housing, an engine housed therein, a three hundred foam planetary gearbox, a spindle with a working head at the end, and a mechanism for switching the speeds of rotation of the spindle in the form of a torque limiting coupling including

mounted on the carrier of the second step of the reducer, a leading gear half coupling, a spring-loaded driven gear half coupling installed on

a spindle, and a turn-on node of the carrier of the third stage of the reducer with a spindle during the transmission of the limiting torque, characterized in that, in order to increase the dol- the wrench, the knowledge of the coupling half is also installed with the possibility of rotation about the axis

the spindle, and the switch-on unit has a one-sided clutch of the limiting moment, the leading gear coupling of which is made in one piece with the carrier of the third stage of the reducer,

the driven half-coupling of which is mounted on the driven half-coupling with the possibility of axial movement, is spring-loaded in the direction of the spindle and has two diametrically arranged teeth on the free end, in the form of a spring loaded disk mounted on the spindle, . .

Sources of information taken into account 11pri expertise

1. The patent of Germany 1478885, cl. B 25 B 21/00, 1970.

2. USSR author's certificate №..837840 ,, class. B 25 B 21/00, 1979 (prototype).

Suss

7

Claims (1)

Claim A wrench containing a housing, an engine housed in it, a three-speed planetary gearbox, a spindle with a working head at the end, and a spindle speed switching mechanism in the form of a torque limit clutch including a drive gear coupling half, rigidly mounted on a carrier of the second gear stage, a spring-loaded driven gear coupling mounted on the spindle, and at the green side of the carrier, the third stage of the gearbox with the spindle when transmitting the maximum torque, characterized in that, in order to increase the the durability of the wrench, the driven coupling half is also mounted with the possibility of rotation relative to the axis of the spindle, and the switching unit has a one-way coupling of the limiting moment, the leading gear coupling of the cotter is made integrally with the carrier of the third gear stage, the driven gear coupling of which is mounted on the driven coupling with the possibility of axial movement , spring-loaded towards the spindle and> has on its free end · two diametrically spaced teeth, th in the form of a spring-loaded disc mounted on the spindle with face hollows, mating teeth of the driven coupling half-way clutch torque limit.