DE1478885B1

DE1478885B1 - Motor-driven screwing tool for screwing in, unscrewing and tightening screws and nuts

Info

Publication number: DE1478885B1
Application number: DE19641478885
Authority: DE
Inventors: Friebel Dipl-Ing Jens P
Original assignee: Frankfurter Maschinenbau AG
Current assignee: Frankfurter Maschinenbau AG
Priority date: 1964-03-10
Filing date: 1964-03-10
Publication date: 1969-12-11

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 of screws and nuts with a ratchet to the clutch. The power of the

Speed change-over suitable, the on or open spring 28, the counter bearing of the pressure ring 29

screw is formed until the screw heads 5 and the axial ball bearing 30 start to run,

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

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

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

ratchet automatically when a certain turn 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, the drive shaft 4 is supported by the needle bearings 7 and 32, the power flow for the high speed is immediate Main spring-loaded slip clutch, with a 15 bearing of the output shaft 1 and is held by a rotating circlip 18 arranged for the reduced speed in the housing cover 15 b , gear transmission, the planetary gear carrier of which is designed as a spring-loaded overrunning clutch. the part 15 α, which contains the drive motor, and the disadvantage of this known screwing tool 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. Is the clutch 11, 11a as in the drawing

The invention is based on the object of a 25 shown, engaged, so the outer wheel 3 is over To create a screwdriving tool in which the above-mentioned toothing 13 and the coupling carrier 9 were rotated Disadvantages are eliminated. fixed to the planetary gear carrier 1 α and the output

This task is connected to a screwdriver shaft 1. As a result, the planes of the type discussed at the beginning can be solved in that ten wheels 2 no longer rotate around their shafts 35 in the planetary gear at the high speed in 30 wheel carriers 1 α , so that no relative movement is blocked and with the speed of the angels between the Drive shaft 4 and the output drive shaft rotates as a whole. wave can take place. So the whole thing works

An exemplary embodiment of the invention is geared to the planetary gear. 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 stand on the output shaft 1, the coupling screwing tool begins, which is displaceable on its one end designed as a multi-ling 11, 11 α at a certain torque to a splined shaft, which ratchets, the clutch carrier 9 executing 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 incline, whereby the spring force is overcome 22. 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 11 α is not yet supported by 20, held in the position shown. The fully disengage, 10 and 10 α 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 the planetary gear carrier 1 α and the transmission consists of the sun gear 27, the planetary clutch 11, 11a formed as an extension of the drive 50, the outer gear 3 with the clutch carrier 9, and the gears 2 , the outer gear 3 and the planet gear clutch 10, 10 α 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 lung support 9, which is canceled by its toothing 13, and it begins with the impeller transmission given by the reversal in the internal toothing 12 of the outer wheel 3 35 adapts to a 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 ring26 held ball guide5 "...
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 has 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, the speed changeover by optionally coupling its outer gear (3) with the planetary gear carrier (1 ä) 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 d) between the outer wheel (3) and the planet gear carrier (1 α) is disengaged and a clutch (10, 10 α) between the outer wheel (3) and the housing (15 ä) is engaged.

2. Screwing tool according to claim 1, characterized in that when disengaging the clutch between the outer wheel (3) and the planet carrier (1 a) and when engaging the clutch (10, 10 a) 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 occur.

3. Screwing tool according to claim 1, characterized in that the clutches (11, 11 a and 10, 10 a ) 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 gearing carries a ball guide (5) on its outer cylindrical surface, with the help of which it can simultaneously perform rotating and axially sliding movements in the housing (15).

1 sheet of drawings

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