DE7613550U - Planetary gear, especially for driving several rollers or the like. With a small center distance - Google Patents

Description

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Patent application

"Planetary gear, especially for driving several

I rollers, or the like. with small center distance "

I Applicant: Rheinstahl AG, 43 Essen

I For systems in which several relatively close

I working devices of separate motors that are positioned one above the other

I have to be driven off, e.g. in rolling mills, calender

I work, bending machines or the like, it is often because of the

I small center distance of the work equipment (rollers)

ff difficult or impossible to move the gears or to-

I should at least accommodate their power amplifiers next to each other, so that}

ι it is necessary to arrange these axially offset to one another

f and the axial distance to the rollers or the like, in on-

i agile and space-consuming way through cardan shafts,

I to bridge flat spindles or the like. It is about

i mostly about gears that run relatively slowly.

The E.ri'igung has set itself the task of making this complex Measures to avoid and to create a transmission that has the smallest possible dimensions in the radial direction, in particular has a small outer diameter.

The invention is based on ;; from a planetary gear

the drive through the inner central wheel and the output

: takes place through the planet carrier, the inner central

wheel with double helical teeth and freely movable radially and axially is connected to the drive shaft.

- 2 -

The invention consists in that the inner central wheel consists of a double wheel with two opposite to each other directed helical gears, the associated planet carriers are connected to each other and to the output shaft by double joint couplings.

A special embodiment consists in that the double joint couplings are toothed couplings _{or the like}

The invention also consists in that the planet gears are mounted on roller bearings.

Herringbone planetary gears with load compensation, which have a mounted planet carrier, are known, for example. by the DT-PS 814 981 and the DT-PS 1 132 772. These gears are in the main-sso-tie £ üv the drive of high-speed enüer machines with large ÄriLtriebslciöLuugt suitable. Due to the high speed, your planetary gears are mounted on plain bearings, as hydrodynamic lubrication is possible *

Due to the bearing of the planet carrier in the housing, these gears are very long. Also owning they usually have an elaborate load compensation on the outer central wheel, which significantly increases the outer diameter of the gearbox.

Also herringbone planetary gears with load balancing, in which the inner central gear with the drive shaft and the Planet carriers are connected to the output shaft radially, axially and angularly, are already known, e.g. through DT-PS 1 173 305 «, This is also about high-speed gears that allow the use of sliding

7613550 31.8a 77

- 3-

allow storage at the planetary gears. This construction already leads to a relatively small outer diameter of the gear unit.

With the / slow-running planetary gears according to Invention lacks the prerequisites for hydrodynamic lubrication, which makes it even more difficult that the planetary axes, due to the necessary machining gap between the two gear sides, turn out to be very long and thin.

There is not enough space inside the planetary gears for the arrangement of roller bearings. They would too Deflections of the planetary axes are impermissibly large; on the other hand, if more than two bearings are arranged the storage can no longer be carried out statically determined.

If, however, according to the invention, two parallel planetary gear sets are provided, the one in the double-helical toothed inner one Engage the central gear, whereby the planet carriers can adjust independently of each other under load, so result surprisingly so favorable conditions that the radial dimensions of the gear with constant Tooth pressure can be kept significantly smaller. By dividing the planet gears into two helical halves, it is possible to change their axes to shorten and thus to reduce the deflections. This allows the diameter of the axes to be reduced, whereby the possibility of using roller bearings is given if necessary.

761355S 31.8 * 77

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On the whole, the inventive arrangement can be based on two parallel planetary gear sets with constant tooth pressure after the modified Hertz ¹ see \ formula

f W Md (i + 1)

■ V

A ₀₁ VB

the diameter of the gear can be kept smaller by yz than that of a planetary gear with straight or helical teeth and a one-piece planetary gear set, with a fixed ratio of diameter to width of the inner central gear being maintained.
In the formula:

ρ ^β specific pressure

f - constant «21.4

d _n , ■ diameter of the inner central wheel

Md = »torque

Λ J Λ _ · Λ_1__ ·· 1_ ι / Til ι Λ / -Ϊ

Central wheel)
B «Face width of the inner gear

An exemplary embodiment of the invention is shown in the drawing. She shows it

the gearbox in a schematic representation, where A is the drive side (motor or primary gearbox), and B is the drive side (roller).

It denotes 1 the drive shaft, which has a double tooth clutch 2 the non-supported inner central wheel 3, consisting of the two double-helical toothed parts 3a and 3b drives.

Two planetary sets engage in the toothings 3a and 3b the helically toothed planet gears 4a and 4b. The planet carriers 5a and 5b are mutually through a Double tooth clutch 6 connected; the right planet carrier 5b is also connected by a double toothed clutch 8 to the output shaft 7 (drive pin of the roller), which is in the Rolling bearings 13 is mounted.

The planet gears 4a and 4b are supported by ball bearings 9 on their axles. 10 are the outer central gears, which are firmly connected to the gear housing 11 and absorb the reaction torque. The gear case is with a Dreliroment support 12 connected. It can also have a lantern be screwed to the machine frame.

The gist of the invention is _? that dure-h the double helical toothing of the non-supported, axially frei.verschieblicheii inner central gear 3, the torque is evenly distributed to the two planetary sets arranged parallel to one another, the load balancing within the two planetary sets being effected by the fact that each planetary carrier 5a, 5b is also can freely adjust the wheels 4a, 4b radially independently of one another under load.

Expectations:

7613558 3 et al. 77

Claims (2)

"ι Protection claims 1, planetary gear, especially for the drive of several rollers, or the like _Q with a small center distance, in which the drive takes place through the inner central gear and the output through the planetary carrier, the inner central gear with double helical teeth and freely movable radially and axially with the Drive shaft (1) is connected, characterized in that the inner central wheel (3) consists of a double wheel with two oppositely directed helical gears (3a, 3b), the associated planetary carriers (5a, 5b) with each other and with the output shaft (7) are connected by double joint couplings (6, 8) _e 2. Planetary gear according to claim 1, characterized in that the double joint couplings (6, 8) are toothed couplings ο 3 _e planetary gear according to claims 1 and 2, characterized in that the planet gears (4a, 4b) are mounted on roller bearings. 7513550 31st I & 77