SU729042A1 - Set-torque wrench head - Google Patents

Description

one

The invention relates to the field of engineering, in particular to the design and manufacture of screw-screwing tools with limited torque.

A known calibrated head, which is a shaft for transmitting torque, is mounted in bearings. On the eccentric shaft journal, there is an additional bearing between the bearings, abutting against the mounting movable stops located in the housing and moved by a tapered ring screwed onto the housing .1.

- However, the specified calibrated head can transmit small torques.

The closest to the technical essence of the invention is a calibrated head, comprising a housing and a shaft mounted therein with sockets for rolling bodies and a turnkey square on one of the forges 2). .

However, when a known head is in operation, the moment of reaching the adjusted torque is intermittent, so; How depends on the number of contacting

tel kacheni In addition, in order for the key to operate, the key needs a movement of the key at an angle, which is necessary for rolling the rolling bodies out of the slots available for them. This leads to difficulties in operation, especially in hard-to-reach places, when the angle of the handle's cuff is small and not enough to pull the rolling body out of the slot, or the angle of the handle's rotation is such that it inevitably leads to the handle striking the product when it is worn. body rolling in the nest, when it gets a jerk in the direction of the application of force. This leads to emergency situations.

The aim of the invention is to improve the operating conditions with a calibrated head.

 This is achieved by the fact that, in the calibrated head, the shaft is made with a cavity filled with hydroplastics, and with a loose end, the turnkey square is made with a side opening

2 (; with the cavity of the shaft, the head is equipped with a piston installed in this hole, and a screw plug screwed into the shaft thread, and the rolling bodies interact with the hydraulic plastic and the housing.

In addition, the rolling bodies can interact with the housing and hydro-plastic, respectively, through elastic elements and plungers.

FIG. 1 shows a calibrated head, a slit; in fig. 2 shows section A-A in FIG. one; in fig. 3 - section B - B in FIG. I; in fig. 4 shows a section B-B in FIG. one.

In case 1 (see Fig. 1) there is a hollow shaft 2, filled with hydroplastic 3. A plug 4 with a lock nut 5 is screwed into the end of shaft 2. Sockets 6 are made in the outer surface of shaft 2 in the form of annular grooves, the sockets are filled with balls 7 (see Fig. 3). At the other end of the shaft 2 there is a square 8, on one side of which nopujeHb 9 is mounted, which through the channel 10 contacts the hydroplastic 3. The shaft 2 is prevented from falling out of the housing 1 with the threaded ring 11.

In the embodiment, the nests for the balls are holes in which the plunger is inserted, the chambers 12, and the balls 13 are in contact with elastic elements that are attached to the body so that the mount eliminates turning the ring 14 relative to the body I, for example, using a pin 15 and groove made on the ring 14 (see Fig. 4). The head works as follows. . When screwing in the plug 4 inside the shaft 2, a pressure is created which, by increasing the diameter of the shaft 2, forces the balls 7 (Fig. 3) to press against the case 1. By creating a different pressure value, we obtain various torques that need to be applied to turn shaft 2 relative to housing 1. The head is working only in elastic deformations: the tool worn on square 8 (see fig. 2) may not affect piston 9, then the torque setting is performed by screwing in plug 4, and the moment the tarry trigger This head is traced by movement, for example, the risks applied at the shaft 2 end are relative: to the scale applied to the ring 11 end. The head design also permits automatic torque adjustment, which is achieved due to the dimensions of the groove made aside from the square hole of the working tool.

At the moment of putting the tool on the square 8, the bottom of the groove re-piston 9, and since the latter is in the tank with hydraulic plastic, the pressure in the shaft 2 will change. Changing the size from the side of the square hole to the bottom of the groove, made on the opposite side of the square hole, we get different torques. In this case, plug 4 serves to pre-tune.

To create heavy torques, the pressure that occurs inside the shaft 2 acts on the plungers 12 (Fig. 4), which move the balls 13 from the center, and since the balls 13 are in contact with elastic rings 14, they deform them,

tends to transform from a ring to a polyhedron. The rings 14 are installed so that they cannot rotate relative to the housing 1, and therefore a certain torque is required to turn the shaft 2.

By creating, using a plug 4 or a piston 9, a different pressure inside the shaft 2, we obtain the various torques needed to turn the shaft 2 relative to the housing 1.

The calibrated head has no starting position. Such an implementation of the calibrated head ensures the Permanent readiness for operation, since the intermittent nature of the achievement of torque is eliminated. This improves the performance characteristics of the head, since it allows it to be used to work in hard-to-reach places, without damaging the product with the key handle, which improves the quality of the manufactured products.

Claims (2)

1. A wrapped headboard, containing a housing and a shaft installed in it, with nests for Rolling bodies and a turnkey square at one of the ends, characterized in that, in order to improve the operating conditions, the shaft is made with a cavity filled with hydroplastic, threaded on a free butt end, a turnkey square is made with a piston installed in this hole, and a threaded plug screwed into the shaft thread, and the rolling bodies interact with the hydraulic plastic and the housing. 2. The head according to claim 1, characterized in that the rolling bodies interact with the body and the hydroplastic mass, respectively, through elastic elements and plungers. Sources of information taken into account in the examination 1. USSR author's certificate number 468774, cl. B 25 B 23/00, 1975. 2. Author's certificate of S.СХ.Р No. 436187, cl. B 25 B 23/14, 1974 (fipototip).