SU1524993A1 - Impact nut-driver - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to a handheld mechanized tool. The aim of the invention is to increase the reliability and improve the weight and size characteristics of the wrench. The goal is achieved by reducing the size of the wrench in cross section. Impact wrench includes a housing 1, a drive 2 with a drive shaft 3, anvil spindle 4 with working cams 6, a drummer comprising a holder 7, a lead 8 and fingers 9 with shock cams 10, each of the fingers 9 is made with an arched lip 15 forming with its cylindrical surface is ledges 16, 17, and a central hole 18 in which abutments 19 are located. Abutments 19 are a rod with a head 20. The uncoupling mechanism is made in the form of V-shaped grooves, which are directed to the opposite sides, and balls. The lead 8 is mounted on the drive shaft 3 with a gap. 5 il.

Description

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with

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the stops 19 are located. The stops 19 are a rod with a head 20. The uncoupling mechanism is made in the form of V-shaped grooves, which are directed to the opposite sides, and balls. The lead 8 is mounted on the drive shaft 3 with a gap. 5 il.

The invention relates to mechanical engineering, in particular to a handheld mechanized tool, and can be used in various types of space when tightening threaded connections.

The purpose of the invention is to increase the reliability and improve the weight and size characteristics of the wrench.

reducing the size of the Wrenches in cross section.

FIG. 1 shows a longitudinal section of the impact wrench; FIG. 2 shows section A-A in FIG. 1 (turned on

90); in fig. 3 shows a section BB in FIG. 1 in FIG. 4 shows a section B-B in FIG. 2; in fig. 5 is a section of YYD in FIG. 2

The impact wrench includes a housing 1, a drive 2 with a drive shaft 3, an anvil spindle 4 with a head 5 at one end and working cams 6 at the other. On the drive shaft 3 there is a composite drummer, including a holder 7, accommodated therein with the possibility of a joint rotation and relative movement of the leash 8 and pins 9 with impact jaws 10 at the end. The fingers 9 are spring-loaded in the direction of the spindle anvil 4 springs 11 and 12, respectively. The obog a 7 is made with a central hole 13 and parallel to it and intersecting it along the generatrix by two openings 14, in which the lead 8 and the fingers 9, respectively, are arranged. Each of the fingers 9 is made with an arcuate lip 15 forming with its cylindrical surface along the ends of the ledges 16 and 17, and the central hole 18, in which the stop 19 is located, the springs 12. The stop 19 is made in the form of a rod with a round head 20. The leash 8 is made with a diametrical groove 21, in which the heads 20 and the ledges 16 of the fingers 9 and interaction They form 22 and 23 lateral sides of groove 21, respectively.

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five

0, about 5 Q

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The leash 8 is kinematically connected to the drive shaft 3 by means of an uncoupling mechanism, embodied in the form of V-shaped grooves 24 and 25, which are placed respectively on the drive shaft 3 and the leash 8 and are directed to the vertices. in opposite directions, and the balls 26, interacting with the V-shaped grooves 24 and 25.

On the outer cylindrical surface of the driver 8 is fixed a key, 27. The key 27 is simultaneously placed in the groove 28 of the yoke 7, fixed on the drive shaft 3 from axial movement by the stopper 29.

The lead 8 is mounted on the drive shaft 3 with a gap.

The impact wrench works as follows.

After installing an allen key (not shown) on the nut of the tightening threaded joint (not shown), the actuator 2 is turned on, the rotation through the drive shaft 3, the V-shaped groove 24, the ball 26 and the V-shaped groove 25 is transmitted to the leash 8 and through key 27 on the yoke 7. Together with the yoke 7 and the leash 8, the fingers 9 rotate. Since the impact cams, 10 fingers 9 interact with the working cams 6 of the spindle anvil 4, the latter rotates the torque through the head 5 to nut of tightening compound (not shown). As the nut is tightened, the resistance to rotation in the threaded connection increases and the anvil spindle 4 is braked.

In connection with this, the fingers 9, the yoke 7 and the leash 8 are braked in the rotational movement.

As the drive shaft 3 continues to rotate, as a result of the interaction of the V-shaped groove 24) of the ball 26 and the V-shaped groove 25, the leash 8 moves axially away from the anvil spindle

five,.,

4, the spatzk 27 slides along the groove 28 of the sleeve 7, and the spring 11 contracts, with the generators 23 acting on the shoulders 16 of the fingers 9 and the latter moving together with the driver 8 in the axial direction away from the anvil spindle 4; The shock cams 10 fingers 9 are disengaged from the working cams 6 of the anvil spindle 4.

After this, the leash 8 and the yoke 7 begin to rotate together with the driving shaft 3, however, the axial movement of the leash 8 fingers 9 towards the spindle of the anvil 4 due to inertia continues until the rotation speed of the leash 8 and the yoke 7 is equal to the speed of rotation of the drive shaft 3. Then, under the action of the spring 11, the leash 8 begins to move to its original position, while the surfaces 22 of the leash 8 act on the heads 20 of the stops 19 of the fingers 9 and move them together with the leash 8. When the leash 8 is moved under the action By means of a spring 11, the potential energy of the spring 11 is converted into the kinetic energy of rotation of the driver 8, the holder 7 and the fingers 9 relative to the drive shaft 3.

In its rotational movement and axial movement of the leash 8 rolls the ball 26, interacting with the V-shaped grooves 24 and 2-5. The axial movement of the driver 8 and the fingers 9 continues until the end surfaces of the shock cams 10 of the fingers 9 are in contact with the ends of the working cams 6 of the spindle anvil 4. At this moment the leash 8, the fingers 9 and the yoke 7, and axial movement towards the anvil spindle 4 makes the leash

8 and the stops are compressed spring 12, and shock cams 10 fingers

9. Slip the ends over the ends (working cams 6 of the anvil spindle. 4. This continues until then.

until the ends of the working cams 6 of the spindle anvils 4 come out of contact with the ends of the impact cams 10 fingers 9. After that, the carrying impact cams 10 fingers 9 under the action of the springs 12 move in the axial direction until their ledges 16 contact the surfaces 23 of the leash 8. Subsequently, the fingers 9 move together with the leash 8, having a total rotation with the yoke 7 until a shock occurs at which the full kinetic energy of the accelerated masses is transmitted through the impact jaws 10 of the fingers 9 to the working cams of 6 pins l-anvil 4 and further on the threaded connection (not shown). Further to those

as long as the actuator 2 is turned on, the blows are periodically repeated and the wrench operates in the sequence described.

Claims (1)

Invention Formula Impact wrench, comprising a housing, a drive shaft with a drive shaft, anvil spindle with with a turnkey head, at one end and working cams at the other, a hammer mounted on the drive shaft, including a holder with central and parallel two holes and accommodated in them with the possibility of joint rotation and relative axial movement and spring-loaded in the direction of the spindle - anvil leash and pins 1 with shock cams on co-fats, and an uncoupling mechanism, kinematically linking the leash to the drive shaft, characterized in that, in order to increase reliability and improve weight and size characteristics, each of the fingers is made with a flat pattern that forms a shoulder at the ends of the finger, the leash is made with a diametrical groove, the surfaces of which are designed to interact with the shoulders of the fingers, and the leash is basified along the inner surface of the cage hole. A-A Rotated f / IS 1b 14 1 eight FIG. H Fi.Z FIG. five