DE1478885C

DE1478885C - Motor-driven screwing tool for screwing in, unscrewing and tightening screws and nuts

Info

Publication number: DE1478885C
Authority: DE
Inventors: Dipl.-Ing. Jens P. 6OOO Frankfurt Friebel
Original assignee: Frankfurter Maschinenbau AG
Current assignee: Frankfurter Maschinenbau AG

Claims

1 21 2

The invention relates to a motor-driven axial stroke movement that is carried out at the same time

Screwing tool for screwing in or unscrewing and the clutch carrier 9 with the outer wheel 3 the

Tightening bolts and nuts with a slip to clutch. The power of the

Suitable for speed switching, the on or on. Spring 28, the counter bearing of which is supported by the pressure ring 29

screw until the screw heads S and the axial ball bearing 30 come into contact with each other.

or nuts on the contact surface with high and that will be. The bias of the spring 28 is

Tightening with reduced speed of the output - the torque at which the teeth of the

wave causing epicyclic gears, which clutch 11 and 11 α slide on each other and

slip automatically when a certain rotation is reached. The coupling carrier 9 is

moments on the output shaft lower speed io against the input shaft 4 of the transmission through a

turns on. Needle bearing 8 of the planetary gear carrier 1 α against the

In a known screwdriver of this type, drive shaft4 through the needle bearing? and 32 stored. The power flow for the high speed is immediate The planet gears 2 run with bearing needles 6 to bar from the drive shaft via an engaging their shafts 35. The ball bearing 19 is the main spring-loaded slip clutch, with a 15 bearing of the output shaft 1 and is supported by one for the reduced speed arranged recirculating circlip 18 held in the housing cover 15 b , gear transmission, the planetary gear carrier of which is designed as a spring The housing of the screwing tool consists of a loaded overrunning clutch, runs with it. the part 15 a, which contains the drive motor, and the disadvantage of this known screwdriver the part 15, which has a mounting flange 15 c with that at the high speed the gear for the ao mounting holes 34 carries, and the housing cover runs with low speed and each a coupling 15 b, which serves as a bearing plate,
ratchets over the clutch teeth, which leads to a high The mode of action of the illustrated screwdriver wear and tear on these parts and an unnecessary tool is the following:
Loss of performance brings. If the clutch 11, U a, as in the drawing

The invention is based on the object of providing a 25 shown, engaged, so the outer wheel 3 is to be created by means of a screwing tool, in which the disadvantages mentioned above, the toothing 13 and the clutch carrier 9, are eliminated. fixed to the planetary gear carrier 1 α and the output

This task is connected to a screwdriver shaft 1. This allows the tarpaulin initially treated type solved in that ten wheels 2 no longer around their shafts 35 in the planetary Rotating epicyclic gears at the high speed in 30 wheel carriers 1 α, so that there is no relative movement is blocked and rotates as a whole at the speed of the angular position between the drive shaft 4 and the output drive shaft. wave can take place. So the whole thing works

One embodiment of the invention is in the epicyclic gearbox. The. Coupling carrier 9 is

The following description on the basis of the drawing initially through the pretensioning of the spring 28 in FIG

purifies. 35 held position so that the coupling

1 with the output shaft of Umlaufräder- is lung 11, 11 remains engaged α. If the counter gear is designated, which is at the same time the output shaft of the output shaft 1, the coupling screwing tool begins, which is displaceable on its one end designed as a multiple 11, 11 α at a certain torque to a splined shaft, which slip, The clutch carrier 9 executes a stroke against the Fe screw 24 as a result of the wrench socket of 28 held by the disk 23, the locking ring 25 and the 40 clutch tooth bevel, whereby the spring force is overcome 22 carries. The wrench socket 22 is and the couplings 10 and 10 α are brought into engagement by a spring 21, which is placed on the threaded ring. As long as 11 and Ha are not yet supported by 20, held in the position shown. The fully disengage, 10 and 10 a but already partial output shaft 4 of the Umlaufrädergebtieres is over 45 ™ engagement, the output shaft is blocked. With a square 16 from the output member 33 of the motor at the beginning of this blockage, however, the full drive comes. The output member 33 of the motor is in the reduction of the epicyclic gearing to the effect of the ball held by the locking ring 31 through the resulting torque bearing 17. The actual epicyclic gears increase between * v4em planetary gear carrier 1 α and transmission consists of the sun gear 27, the planetary clutch 11, 11a formed as an extension of the drive so the outer gear 3 with the clutch carrier 9, the shaft 4 is completely overcome, and the wheels 2, the outer gear 3 and the planet gear clutch 10, 10 a is fully engaged. In this ger 1 α with the output shaft 1 as well as the coupling moment, the blocking of the output shaft 1 is armature 9, which is lifted by its toothing 13, and it begins with the by-Umgenau in the internal toothing 12 of the outer wheel 3 55 running gear adapts given lower speed, and by means of a locking pin 14 tightly to the run. If the working torque decreases, the outer wheel 3 is connected. The outer wheel 3 is automatically with itself again in the drawing dardem clutch carrier 9 in the housing 15 on the state of the transmission set by a.
the retaining ring 26 held ball guide 5 _ ...
axially displaceable and rotatable. For the 60 fat claims:
Axial movements of parts 3 and 9 with one another are 1. Motor-driven screwing tool that alternately engages and loosens the couplings 11, 11 α and 10 for screwing in, unscrewing and tightening 10 α. The clutch 11, 11, screws and nuts with a sawtooth clutch changeover loaded by the spring 28 is suitable for the speed certain working torque on the or nuts on the contact surface with high and output shaft 1, which also acts between the clutch, the tightening with reduced speed of the carrier 9 and the planetary gear carrier 1 α, with the output shaft causing epicyclic gears,

which automatically switches on a lower speed when a certain torque is reached on the output shaft, characterized in that the epicyclic gearing with a planetary gear carrier (la) connected to the output shaft (1), planetary gears (2), an outer gear (3) and one with the drive shaft ( 4) connected sun gear (27) is formed, whereby the speed change takes place by optionally coupling its outer gear (3) with the planet carrier (1 d) to achieve a low speed by a helical tooth gear when a certain torque is reached on the output shaft (1) Slipping clutch (11, 11 a) between the outer wheel (3) and the planetary gear carrier (1 a) is disengaged and a clutch (10, 10 a) between the outer wheel (3) and the housing (15 a) is engaged.

2. Screwdriving tool according to claim 1, characterized in that when the coupling is disengaged between the outer wheel (3) and the planetary gear carrier (1 a) and when the coupling (10, 10 a) is engaged between the outer wheel (3) and the housing ( 15 a) the force of a spring (28) must be overcome, the bias of which determines the size of the output torque on the output shaft (1) at which the clutch movements take place.

3. Screwing tool according to claim 1, characterized in that the clutches (11, 11 a and 10, 10 d ) engage not directly on the outer wheel (3), but on a coupling carrier (9) firmly connected to this.

4. Screwing tool according to claim 1, characterized in that the outer wheel (3) of the epicyclic gear carries a ball guide (5) on its outer cylindrical surface the help of which it executes rotating and axially sliding movements in the housing (15) at the same time can.

1 sheet of CQPY drawings