DE7626371U1 - SCREWDRIVER WITH TORQUE MEASURING DEVICE - Google Patents

Description

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HOBEL OmbH. ft Oo
8000 million dollars 75

k. 210

(Jebrauohsmuster application Sohraubmasohlne with torque measuring device

Screw machine with a torque measuring device are known according to the DP 960289 »Die MaebMne has a torque display device in the force path between the adjustable coupling and the screw head,

the one prevailing during the Einohraubvorgang Indicates torque on a scale · The torque indicator is part of an epicyclic gear; it herden reaction forces on the planet carrier over a iPleuel made readable on a scale device. The Verdrehorgan ,, for the display determination is the Planetary gear carrier · The gear unit specially used for measuring is complex and expensive; in addition of considerable weight and space requirement

In general, screwdrivers with torque setting can only be loaded with spring pressure or oil pressure Slipping clutches equipped. The size of the pressure is measured and transmitted to a display device The display gives an indication of the presumably set torque value of the slipping clutch. This torque size is influenced by several circumstances Friction factor given as after the coupling parts have slid against each other · In addition, the coefficient of friction changes both the degree of roughness of the coupling surfaces, whether they run oil-wetted or dry, as well as the straight existing temperature. In addition, the gear parts fcis arranged after the clutch store towards the screw head through the

7626371 04/07/77

Rotational motion is a kinetic energy. This will be in the moment effective because the screw part suddenly turns tight. The more jerky the standstill of the screw spindle, the greater the force the kinetic energy that results in the clutch torque still in effect due to the slipping clutch parts added. These numerous, the coupling effect or the Allow the torque output on the screw head to influence circumstances no exact pre-torque setting and corresponding Torque output to.

The invention is based on the object of a torque measuring device to create, which is arranged at the end of the force-transmitting organs and the measurement result in real size indicates. For this purpose, the measuring device must be built robustly and in both directions of rotation be overloadable; The measurement result must also be read from all sides while turning and in the stopped position to be possible. Also the torque of a screw to be loosened should be ascertainable.

This object is achieved in that the Torque measuring device from a force-introducing flange, from one or more torsionally elastic or a rotary movement permissible intermediate parts and an output flange, and that one between the flange and the drive flange Corresponding ring with measuring marks is arranged, which the relative rotational movement occurring under the action of torque makes measurable. To all of the torque output influencing To be able to take into account factors is advantageously the torque measuring device after the torque adjustable slip clutch arranged. With a further advantage, the torque measuring device is at the end of the force-transmitting Organs, preferably installed between the screw spindle and screw head. For easy reading of the torque size, it is advantageous to have the corresponding ring and a flange around the whole To be provided with measuring marks around the circumference.

An exemplary embodiment is shown in two drawings and is described in more detail below:

7626371 07.0i.77

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Figure 1 screwdriver with adjustable torque Slipping clutch and a built-in torque measuring device at the end of the driven organs icht

Figure 2 sectional view of the torque measuring device

The screwdriver 1 has a slip clutch arranged in the gear housing 2, which by pressure elements 3 and Spring cylinder 4 is adjustable in clutch pressure. One A certain amount of spring pressure is set by pressing the clutch lever 5 down to the contact point the stop screw 6. The torque now transmitted by the slip clutch is on the way to the screw head 7 changed by numerous factors. Therefore, the torque measuring device 8 is interposed immediately in front of the screw head 7. It is installed between screw spindle 9 and screw head 7. The screw spindle 9 is with a tooth profile positively connected to the force-introducing flange 11, the over a torsionally elastic intermediate part-12, e.g. a rubber element, with the output flange 13 frictionally, but against each other rotatable, is connected. This combination can also be referred to as a torsionally flexible coupling. The under one Torque action occurring relative rotational movement between the flange 11 and the output flange 13 is through a KoriEspondierenden ring 14 made with measuring marks 15 measurable. The peak moment at the moment before the transition from one another stationary coupling parts in mutually sliding motion occurs, is determined by the torque measuring device completely, even if only displayed briefly. Then only that which is transmitted by the sliding coupling parts is transmitted Torque displayed. The additional short-term peak, which results in the clutch breakaway torque due to the release of the kinetic Energy of the stopped gear rotating parts is set by the torsionally elastic intermediate part 12 within the Torque measuring device made harmless or absorbed.

7626371 07.0477

The torque measuring device is provided by means of a split disk 16 axially attached to the screw spindle 9. On the screw head flange 17, the screw head is positively locked with a square 18 connected.

Claims (4)

".urT '. _r :, - i, p ™ -v / j, n.-ij>" t ·. "-i '* s» ■. * i * w / t ^ ~ .H> ■ f ■ n <ww | Q ^ M> ty ^^^ ιι. ■> p ■ tι ■ ^ ■■ ι ■ 3 ^ ^> ί · '''· ^ *' ^ ■ '' ^ i'rl · ι * ^ ■■ ^ i ^ ''»Ai'W'W" ¹ '' · 'W'"V ^ 'li'«" Λ ") κ.« -'- I ^>"MfSiIi ■ iV {i {l {Ut. (. FtJ kW '' KAIS '' 'MM »II <*? τ * ff Sayings 1 # screwdriver with torque ^ measuring device, thereby _; i; "'marked that the torque ^ measuring device 8 _{1 (} on a force-introducing flange 11, from one or more torsionally elastic or a rotary movement permitting intermediate parts 12 and an output flange 13, and that between the flange 11 and the output flange 13 corresponding ring 14 is arranged with measuring marks 15, which makes the relative rotational movement occurring under the action of a torque measurable. 2. Screwdriving machine according to claim T, characterized in that that the torque measuring device 8 after a the Adjustable torque slip clutch is arranged. ί 3. Screwdriver according to claim 1 and 2, characterized in that the rotary torque measuring device 8 towards the end of the force-transmitting organs, preferably installed between the screw spindle 9 and screw head 7. 4. Screwdriver according to claim 1 and 3, characterized in that the measuring marks % 5 of the kc corresponding ring 14 and the flange 11 are distributed around the entire circumference. 7616371 m