SU1232471A1 - Rotary-percussive mechanism - Google Patents

Description

The invention relates to a handheld mechanized tool of a shock-rotational effect, in particular to wrenches, and can be used in various industrial fields during fitting and assembly work.

The purpose of the invention is to increase reliability and durability by reducing the contact stresses on the surfaces of the cams.

1 shows a rotary impact mechanism, longitudinal section; figure 2 - scan cams drummer, stationary gears and balls; on fig.Z - the same, at the time of the transfer of the shock pulse from the drummer to the balls.

The rotary percussion mechanism comprises a housing 1, a drive shaft 2 housed therein, a drummer 3 rigidly connected with it with face working cams 4, a spindle 5, an anvil, filled in the form of a carrier 6, and an immovable gear wheel 7, encompassing Spindle 5 and rigidly fixed in the housing 1. The carrier 6 has balls 8 evenly spaced around the circumference. The working cams 4 of the striker 3 have a circumferential pitch T and are made stepped in height. The pitch T of each of the steps 9–12 is equal to the pitch of the placement of the balls 8 in the carrier 6. The central stage 1.2 of each of the cams 4 has a triangular shape with equal angles of inclination of the side faces. The same angle of inclination has the side faces of the other stages 9-11, while the identical stages of the cams 4 are located at the same height and symmetrically with respect to the central stage 12. This ensures the reversibility of the mechanism and reduces the noise level.

The stationary gear wheel 7 is made with end teeth 13, interacting with balls 8. The number of teeth 4, 4cfBO, is arranged against each of the working cams 4

drummer 3, different from the number of its steps, for example, by one.

The difference in the number of stages of each of the working cams 4 and the number of teeth 13 affects the gear ratio of the shock-rotary mechanism in the mode of its operation of the planetary gear.

The rotation mechanism works in the following way.

When the drive shaft 2 rotates, the drummer 3 rotates along with it, during this stage 9 - 12, its working cams 4 simultaneously strike the balls 8, which transmit to the anvil a total shock pulse, which through the spindle 5 is transmitted to the tightenable threaded connection ( ).

Under the action of a shock pulse, the balls 8 move both in the circumferential direction and in the axial direction. However, the axial direction of movement of the balls 8 is limited by the side surfaces of the teeth 13. By moving in the circumferential direction, the balls 8 carry the carrier 6 along with the spindle 5.

In the process of transmitting a shock pulse, each of the steps 9–12 of the working cams 4 moves the balls 8 in the circumferential and axial directions, moving the latter into the hollows between the teeth 13. At this time, the hammer 3 accelerates, the steps 9–12 of the cams 4 catch up 8, interacting with the previous step of a lower level, moves it to the next trough between the teeth 13 and applies another shock pulse to it, which is again transmitted to the tightened threaded connection in the specified sequence. In the process of rotation of the striker 3, each of the steps 9-12 pushes the ball 8 in front, which simultaneously rolls along the inclined faces of the steps and the side surfaces of the teeth 13.

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Fig, 1 7 8 1Z P y

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12 v

Editor A. Shandor

Compiled by Y. Sereyev

Tehred I.Gaydosh Proofreader M.Samborska

Order 2730/16 Circulation 1031 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4,5

Production and printing company, Uzhgorod, ul, Proektna, 4

Fig.Z

Claims (1)

SHOCK-ROTARY MECHANISM, comprising a housing, a drive shaft placed therein, a drummer kinematically associated with it, end cams, a threaded rod, anvil associated with it and second end cams interacting with end drum cams, characterized in that, for the purpose of innovation reliability and durability beyond. by reducing contact stresses on the surfaces of the cams, the anvil is made in the form of a carrier with balls, each hammer of the hammer is made stepwise in height, and the second end cams are a fixed gear, the number of teeth of which is different from the number of balls. Fig! 1232471.