DuRoWe 552

 
DuRoWe 552

DuRoWe 552

Description

In the early 1952ies, the production of selfwinding movements started in Germany. Although is was not the first one on the market, the Durowe 552 marked the start of the extremely successful series of selfwinding movements from the Deutsche UhrenRohwerke, which were improved many times in important details. The Durowe 552 shown here is the forefather, born in 1952.

base plate

base plate

The base plate is the same as on the manual wind movement Durowe 522, which itself is nothing but a Durowe 422 with a larger base plate. And a relative of this one is (with date indication) the Durowe 435, which is already in the archive.

minute wheel bridge

minute wheel bridge

As usual in these times, the directly driven minute wheel is beared under its own bridge, in the specimen show here even ruby-beared.

gear train

gear train

Of course, all further bearings are also equipped with synthetic rubies, so this is clearly an upper class movement.

The directly driven center second was up-to-date that time.

side view of the gear train

side view of the gear train

The shock protected screw balance is beared in two inhouse Duroswing shock protections and beats contemporarily slow with 18000 A/h. It regulares a conventional lever movement of swiss type.

base plate of the selfwinding module

base plate of the selfwinding module

The selfwinding module is attached with three screws on the base movement and can be released easily. The connectin between ratchet wheel and first reduction wheel is realized by a vertical breguet clutch, sitting on the reduction wheel. It works exactly like the breguet clutch of the yoke winding system:

lower part of breguet clutch, connected with the ratchet wheel

lower part of breguet clutch, connected with the ratchet wheel

With that clutch, the sensitive selfwinding mechanism is decoupled on manual wind. How delicate that mechanism is, can be seen on the first reduction wheel, whose outer gears are already damaged, probably by a blocking. You can see this problem on several old Duromats.

gear train of the selfwinding module

gear train of the selfwinding module

The gear train consists or two reductions wheels with a rocking bar changer, which ensured, that no matter in which direction the oscillating weight turns, the reduction wheels always turn in only one direction and so wind the movement. The difficult to mount clutch is always under (spring-) tension and avoids backward turning of the oscillating weight.

In later movements, the rocking bar changer got a second bearing (both with rubies then) and was located under an own bridge. This makes servicing much easier!

selfwinding module, top

selfwinding module, top

The oscillating weight is axle beared.

bottom of the oscillating weight

bottom of the oscillating weight

Without the mounted selfwinding module, you can easily see the relationshop to the related manual wind movements from Durowe. The additional ruby next to the ratchet wheel for connection of the selfwinding module is the only visible difference.

Durowe 552 without selfwinding module

Durowe 552 without selfwinding module

A final viel with attached selfwinding module but missing oscillating weight, which is secured by a chock with two screws. The movement is almost fully covered.

movement without oscillating weight

movement without oscillating weight

On the dial side, you can see the yoke winding system. On the specimen shown here, the setting lever spring is broken. You can also see the cap jewels for escapement- and third wheel. Theoretically, it is even possible to cover the lever bearing with a cap jewel, since the recess on the main plate is already there.

Durowe 552 dial side

Durowe 552 dial side

In the lab

The specimen shown here was house in a very dirty case and suffered from a blocked selfwinding system and poor rates. After a service, the rates are much better now, only the damaged wheel on the selfwinding system could not be repaired.

Timegrapher result



horizontal positions
dial up +5 s/d 223° 3.0ms
dial down +12 s/d 226° 3.3ms
vertical positions
crown right (12 up) -30 s/d 180° 4.3ms
crown up (3 up) +47 s/d 175° 4.6ms
crown left (6 up) +36 s/d 170° 4.8ms
crown down (9 up) +29 s/d 176° 3.8ms

Technical data

Manufacturer:DuRoWe
Caliber:552
Number of jewels:25
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): Duro-Swing
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel
  • center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:rocking bar winding system
Setting lever spring:3 hole(s)
Features:SCD,AUT
Functions:hour, minute, second, selfwinding
A/h:18000
Size:11 1/2'''
Production period:1952 - 1956
Literature: Flume: 1952 65

Usage gallery

EBS gents watch

EBS gents watch

Licht Automatic gents watch

Licht Automatic gents watch