SU1294595A1 - Percussion-action nut driver - Google Patents

Abstract

The invention relates to a handheld mechanized percussion instrument and can be used in various industries in tightening threaded connections. The purpose of the invention is to increase reliability and simplify the design by reducing the friction losses in the clutch of the torque limit. The impact wrench includes a housing 1, a drive shaft 2 located therein with a central hole 3 and radial holes 4 emerging into it, anvil spindle 5, a composite drummer, the leading part 7 of which is made with an axial boring 8 under the drive shaft 2 and eccentric arc grooves 9. The drive shaft 2 is connected to the leading part 7 through the clutch of the limiting moment. The clutch includes balls 12 placed in the radial holes 4 of the drive shaft 2 and interacting with the forming arc grooves 9. The pressure element 13 is spring-loaded to the balls 12. 2 Il. (L with f GS CD 4 SL SO SD

Description

one

The invention relates to a handheld mechanized percussion instrument and can be used in various industries in tightening threaded connections.

The purpose of the invention is to increase reliability and simplify the design, which is achieved by reducing friction losses in the coupling of the limiting moment.

FIG. 1 shows a shock wrench, a general view in longitudinal section; FIG. 2 shows section A-A in FIG. one.

The impact wrench includes a housing 1, a drive shaft 2 disposed therein with a central bore 3 and radial bores 4 extending into the latter, anvil spindle 5 with face cams 6, a drummer comprising a driving part 7 with an axial boring 8 under the drive shaft 2 and eccentric arc grooves 9 on the cylindrical surface of the bore 8, installed in the driving part 7 with the possibility of joint rotation and spring-loaded relative to the spindle of the anvil 5, the driven part 10 with counter-working cams 11, placed ezhdu driving and driven portions 9 and 10 respectively centrifugal weights (not shown) and a clutch limit

moment in the form of balls 12 ..

The balls 12 are placed in the radial holes 4 of the drive shaft 2 and interacting with the forming arc grooves 9, the pressure element 13 is in the central hole 3 of the drive shaft 2 and is spring loaded to the balls 12 by a spring 14. The number of radial holes 4 and balls 12 is at least equal to two, and the number of arc grooves 9 is a multiple of the number of balls 12. The follower part 10 of the striker is pressed from the spindle of the anvil 5 by the spring 15.

 wrench-works as follows.

After turning on the motor of the nut driver (not shown), the drive shaft 2 and balls 12 begin to rotate. The force of the spring 15 through the pressure element 13 and the balls 12 are transferred to the forming arc grooves 9, while the driving torque 7 is transmitted to the driving part 7 of the impactor.

0

five

0

cop Along with the leading part 7 of the striker, its driven part 10 rotates, while due to the impact of centrifugal weights (not shown), the driven part 10 of the striker periodically moves in the direction of the spindle - anvil 5 for the working cams 11 to engage with face cams

6 spindle 5g anvil 5.

With the engagement of the cams 11 and 6. a shock occurs in which the accumulated kinetic energy of a rotating drummer is transferred to a threaded connection. At the moment of impact, the drummer is fully braked at. In this case, the balls 12 are rotated along the forming surfaces of the grooves 9, reliably protecting the motor from overload. Due to the fact that the number of balls 12 is a multiple of the number of forming surfaces of the grooves 9, the leading part)

The strikes are not warped, and therefore there is no jamming and nadirs on the interacting surfaces of the drive shaft 2 and the leading part 7 of the striker.

After the impact, the spring 15 returns the driven part 10 of the striker and the centrifugal weights (not shown) to their original position, and the blows periodically repeat as long as the engine is turned on, while the mechanism operates in the specified sequence.

Claims (1)

Invention Formula A impact wrench, comprising a housing, a drive shaft with a central hole and radial holes extending into it, a spindle hammer with face cams, a composite hammer including a drive part with an axial boring under the drive shaft having intersecting eccentric arc grooves on it a cylindrical surface, installed in the leading part with the possibility of joint rotation and a spindle-spring-loaded led part with counter face cams, centrifugal gr PS, located between the driving and driven parts, and the coupling torque limit in the form of balls housed in radial holes of the drive shaft and cooperating with obrazzdoschimi arc grooves, and pressure element, spring-loaded to the balls, characterized in that, in order to increase reliability and simplify the design, 12945954 radial holes and balls are chosen at least equal to two, and the number of arc grooves is a multiple of the number of balls. 12 Editor V.Danko Compiled by Y.Sergeev, Tehred IT. Serdazhova Order 430/15 Circulation 95ASubscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader M. Demchik