SU1315276A1 - Percussive nut driver - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to impact wrenches, and is used for mechanized tightening of threaded connections. The purpose of the invention is to increase efficiency and reduce overall dimensions. The goal is achieved by changing the design of the hammer. Drummer made composite. In the leading part of the drummer are made from the side of the spindle - anvil 4 under (L with SP oo O5

Description

13

There are symmetrical holes 15 at an angle to the axis. The driven part of the firing pin is the pins 16 mounted on the intermediate shaft 18. The intermediate shaft 18 is located in the driving part 6 of the firing pin. In the fingers 16, the grooves 19 are provided in which the rotation bodies 20 are mounted. The intermediate shaft 18 and the fingers 16 rotate together and can move axially toward the spins1.

The invention relates to mechanical engineering, in particular to impact wrenches, and can be used in various industries and construction for mechanized tightening of threaded connections.

The purpose of the invention is to increase the efficiency and reduce the overall dimensions of the wrench.

FIG. 1 shows a impact wrench, a longitudinal section in FIG. 2 shows section A-A in FIG. one; on fig.Z - section bb in fig. one; in fig. 4 is a sectional view of FIG. 1, in FIG. 5 - section G-Y. in fig. one; in fig. 6 is a view of D in FIG. 5. The impact wrench includes a housing 1, a drive 2 therein with a drive shaft 3 and an anvil spindle 4 with a turnkey head 5. On the drive shaft 3 there is installed the leading part 6 of the striker with supports in the hole 7 of the spindle anvil 4 and in the bearing 8. In the leading part 6 of the striker there are curved surfaces 9, in the drive shaft 3 there are holes 10 in which the balls 11 are mounted, which interact with ball 12, spring loaded 13 placed in the axial bore 14 of the drive shaft 3. Curved surfaces 9, balls 11 and 12, as well as spring 13 play the role of a coupling preventing operation of, for example, an electric motor in short-circuit mode. When using other engine types, such as pneumatic, a clutch is not required. In the leading part 6 of the striker from the side of the spindle anvil 4, at an acute angle to the axis, symmetrical holes are filled

5276

cutting anvil 4. A sleeve 22 is installed on the intermediate shaft 18. Between the anvil spindle 4 and, respectively, the bushings of the sleeve 22 and the intermediate shaft 18, the power and return springs 29 and 30 are mounted coaxially to each other. impactor and relative axial movement. 6 Il.

15, in which fingers 16 are installed with working cams 17. Fingers 16 are the driven part of a firing pin. In the driving part 6 of the striker, an intermediate shaft 18 is placed, which is connected to the fingers 16 by means of grooves 19, made in the fingers 16, and rotation bodies 20 installed therein, contacting the surface 21 of the intermediate shaft 18.

The intermediate shaft 18 / and the fingers 16 rotate together and can move axially towards the anvil spindle 4. At the end of the intermediate shaft 18, a sleeve 22 is installed with a flange 23 and a radial bore 24, opposite the spring-loaded stop 25 installed in the drive shaft 18. In hole 24

the sleeve 22 is installed the ball 26. In the spindle-anvil 4 is made a hole 27, in which is placed the ball 28. Between the spindle-anvil 4 and, with

Responsibly, flange 23 sleeve 22 and

the intermediate shaft 18 coaxially installed force 29 and returnable 30 springs. The sleeve 22 is mounted for rotation with the outer part 6 of the striker and relative axial movement. To do this, the protrusions 31 are made in the sleeve 22, and in the leading part 6 of the striker - the response grooves 32. On the spindle anvil 4 there are made impact surfaces 33 in the form of radius grooves.

Impact wrench works as follows.

After turning on the engine nut / h

Verta (not shown; drive shaft 3 and balls 11 begin to rotate.

The spring 13 is transmitted through the balls 12 and 11 to the curved surfaces 9, while the dynamic torque is transmitted to the driver 6 of the impactor. Together with the leading part 6 of the striker, the driven part of the striker, imprinted in the form of fingers 16, the intermediate shaft 18 and the sleeve 22 rotate. As these elements rotate, the centrifugal force component directed along the axis of the fingers 16 moves them along. towards the spindle-anvil 4, while the interaction of the rotation bodies 20 with the surface 21 in the direction of the spindle-anvil 4 also moves the intermediate shaft 18 and the sleeve 22, and the springs 29 and 30 are compressed. After the leading part 6 of the striker accelerates to a certain speed and the sleeve 22 moves by a certain amount, the ball 26 interacts with the ball 28, as a result of which the stop is retracted

25, and the sleeve 22 disengages the intermediate shaft from the slot 25, the female shaft 18 as it moves towards the spindle-anvil 4. In connection with this, the force of the power spring 29 no longer counteracts the movement of the fingers 16 and the intermediate M, in the leading parts of the striker from Steel 18 in the direction of the spindle-anvil 4. This causes accelerated movement (firing) of the fingers 16 for their engagement by the impact cams 17. With the anvil spindle 4 along the impact surfaces 33 - a shock occurs at which the accumulated The inertial energy of the rotating mass is transferred to the threaded connection. Subsequently, the springs 29 and 30 return the details of the percussion mechanism to their original position, and the impacts are periodically repeated until

while the engine is on, the mechanism operates in the sequence described.

I

Due to the fact that the ball 26 is oriented relative to the fingers 16, and the ball 28 is relative to the impact surfaces 33, the movement of the fingers 16 to engage their impact cams 17 with the impact surfaces 33 occurs at a strictly oriented position, which eliminates edge shocks.

Claims (1)

Invention Formula A impact wrench containing a drive, a housing, a drive shaft housed in a housing, a composite drummer with working cams, an anvil spindle with counter working cams, mounted in the driver’s main part with the possibility of joint rotation and relative axial displacement of its bushing and a power and return spring that differs the fact that, in order to increase efficiency and reduce overall dimensions, the anvils of the anvil, symmetrically at an acute angle to the axis, the through-holes are made, and the driven part is in the form of In the latter, with the possibility of longitudinal movement of the fingers fixed at one end on the intermediate shaft, the force and return springs are mounted coaxially to each other, the first of which grows between the ends of the anchor pin and the sleeve, and the second between the ends of the intermediate shaft and the spindle - anvils. I sixteen 9и.г.2 in-in 33 Compiled by V.Matvienko Editor I.Nikolaychuk Tehred M.Hodanich Proofreader T.Kolb Order 2257/16 Circulation 953 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod ,, ul, Project, 4 ig.