Planetary transmission

Abstract

A planetary transmission for transmitting drive power to a work machine, comprising a plurality of planetary gearwheels, a plurality of planetary shafts and at least one planetary carrier, the planetary gearwheels being arranged in each case rotatably on one of the planetary shafts, and the planetary shafts being fastened in each case to the planetary carrier, characterized in that the planetary carrier is configured for a releasable connection to a work machine shaft.

Claims

1. A method for assembling a system comprising a planetary transmission and a work machine, wherein the planetary transmission comprises a first module including a plurality of planetary gearwheels, a plurality of planetary shafts and at least one planetary carrier, wherein each of the plurality of planetary shafts are fastened to the planetary carrier only at precisely one end of the respective planetary shaft, and a second module including an internal gearwheel and a sun gearwheel, and wherein the work machine is a press that includes a press shaft having a distal end, the method comprising the following steps: releasably fastening the first module to the press shaft such that the planetary carrier is mounted on the distal end of the press shaft in a floating manner without radial support of a bearing; and thereafter, releasably fastening the first module to the second module.

2. A planetary transmission for transmitting drive power to a work machine having a work machine shaft with a distal end, comprising: a first module including a plurality of planetary gearwheels, a planetary carrier, and a plurality of planetary shafts; and a second module including an internal gearwheel and a sun gearwheel, wherein the planetary carrier is first mounted on the distal end of the work machine shaft in a floating manner without radial support of a bearing and configured for a releasable connection to the work machine shaft, and thereafter, the first module is releasably fastened to the second module; wherein each of the plurality of planetary shafts is fastened to the planetary carrier only at precisely one end of the respective planetary shaft, wherein each of the planetary gearwheels is arranged in each case rotatably on a respective one of the planetary shafts, and wherein the work machine is a press.

3. The planetary transmission of claim 2, wherein the planetary carrier is configured for a positively locking or non-positive connection to the work machine shaft.

4. The planetary transmission of claim 2, wherein the planetary carrier has an internal toothing system, the internal toothing system being configured to engage into an external toothing system of the work machine shaft.

5. The planetary transmission of claim 2, wherein the planetary transmission has a securing means, the planetary carrier being secured by way of the securing means against an axial displacement relative to the work machine shaft.

6. The planetary transmission of claim 2, wherein the planetary transmission has a clamping means, the clamping means being configured for fastening the planetary carrier to the work machine shaft.

7. The planetary transmission of claim 6, wherein the clamping means is configured as a clamping set.

8. The planetary transmission of claim 2, wherein an end of the respective planetary shaft, at which the planetary carrier is fastened, faces the work machine in an installed state.

9. The planetary transmission of claim 2, wherein the planetary transmission comprises a housing, the planetary carrier being arranged at least partially outside the housing.

10. The planetary transmission of claim 2, wherein the planetary carrier is configured as an output shaft or comprises an output shaft, the output shaft being configured to transmit the drive power to the work machine.

11. A system, comprising: a drive means; and the work machine and the planetary transmission according to claim 2, the planetary transmission being configured to transmit a power output provided by the drive means to the work machine.

12. The system of claim 11, wherein the system comprises a flywheel, a clutch and a brake, which system is configured to be driven by the drive means and to transmit the power output which is provided by the drive means to the planetary transmission.

13. The system of claim 12, wherein the system is configured to transmit the power output via the clutch.

14. The planetary transmission of claim 9, wherein the planetary carrier is arranged mostly outside the housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further features and advantages of the present invention will become clear using the following description of preferred exemplary embodiments with reference to the appended figures. Here, the same designations are used for identical or similar components and for components with identical or similar functions. In the figures:

(2) FIG. 1 shows a diagrammatic simplified sectional illustration of a planetary transmission from the prior art,

(3) FIG. 2 shows a diagrammatic sectional drawing of a planetary transmission from the prior art,

(4) FIG. 3 shows a diagrammatic simplified sectional illustration of a planetary transmission according to one embodiment of the invention,

(5) FIG. 4 shows a diagrammatic sectional illustration of a planetary transmission according to one embodiment of the invention, and

(6) FIG. 5 shows a diagrammatic sectional drawing of the planetary transmission from FIG. 4 in the partially dismantled state.

DETAILED DESCRIPTION OF THE INVENTION

(7) The planetary transmission 100 from the prior art (see FIGS. 1 and 2) serves to transmit drive power to a work machine 101 which can be a press, for example. The planetary transmission 100 comprises a sun gearwheel 103, an internal gearwheel 104, a plurality of planetary gearwheels 105, a plurality of planetary shafts 106 and a planetary carrier 107. Here, the planetary shafts 106 are fastened at their two ends (on the right and left in FIG. 1 and FIG. 2) to the planetary carrier 107.

(8) Drive power is transmitted via a drive shaft 102 from a drive means (not shown) to the sun gearwheel 103 which is in engagement with the planetary gearwheels 105. It is also possible that the sun gearwheel 103 and the drive shaft 102 are configured integrally or in one piece. The planetary gearwheels 105 are in turn in engagement with the internal gearwheel 104. Upon rotation of the sun gearwheel, the planetary gearwheels 105 are set in rotation about the respective planetary shaft 106. On account of their engagement with the internal gearwheel 104 and the fastening of the planetary shafts 106 to the planetary carrier 107, the planetary carrier 107 then rotates coaxially with respect to the drive shaft 102 and with respect to the sun gearwheel 103. The planetary carrier 107 serves as an output shaft of the planetary transmission 100 and transmits the drive power to the work machine 101.

(9) The driveshaft 102 can be connected via a clutch K to a flywheel 108, with the result that drive power which is generated by a motor can be transmitted via the flywheel 108 to the driveshaft 102. Here, the motor can be, in particular, a synchronous motor (servomotor) or an asynchronous motor.

(10) Moreover, the planetary transmission 100 comprises a bearing means 200 which serves to mount the planetary carrier 107.

(11) A comparison of FIG. 3 with FIG. 1 and a comparison of FIG. 4 with FIG. 2 are recommended in order to compare the embodiments of the invention which are shown in FIGS. 3 and 4 with the prior art.

(12) The planetary transmission 300 which is shown in FIGS. 3 and 4 is of similar construction to the planetary transmission 100 from FIGS. 1 and 2. One difference consists in that the planetary transmission 300 comprises planetary shafts 301 instead of the planetary shafts 106 and a planetary carrier 302 instead of the planetary carrier 107. One special feature is that the planetary shafts 301 are fastened in each case only with precisely one end 400 to the planetary carrier 302. That end of the planetary shafts 301 which lies opposite the end 400 lies freely. The bearing means 200 is therefore dispensed with in the case of the planetary transmission 300. The planetary carrier 302 is therefore mounted in a freely floating manner on the work machine shaft 303.

(13) The planetary carrier 302 therefore has a lower weight in comparison with the planetary carrier 107 which is known from the prior art. This is advantageous, in particular, since the weight which is saved in the case of the planetary carrier 107 lies very far to the outside during a rotation. The moment of inertia of the planetary carrier 302 is therefore much lower than the moment of inertia of the known planetary carrier 107, which makes itself felt advantageously, for example, in a braking angle reduction of the work machine shaft 303. Moreover, the assembly of the planetary transmission 300 is simplified and production costs are lowered.

(14) The planetary carrier 302 has an internal toothing system which is in engagement with an external toothing system of a work machine shaft 303 of the work machine 101. This achieves a reliable positively locking fastening. Moreover, a reduction of radial movements in the planetary carrier 302 is achieved by way of a low construction-induced play of the toothing system.

(15) Securing rings 401 are used to secure the planetary carrier 302 against an axial displacement relative to the work machine shaft 303. The planetary carrier 302 is therefore mounted on the work machine shaft 303 in a floating manner. Mounting of the planetary carrier 302 via the bearing means 200 is dispensed with in comparison with the planetary carrier 107 which is known from the prior art (see FIGS. 1 and 2).

(16) It can be seen in FIG. 4, moreover, that the planetary carrier 302 is arranged outside a housing of the planetary transmission 300, as a result of which assembly and maintenance of the planetary transmission 300 are simplified. Moreover, the planetary gearwheels 105, the planetary shafts 301 and the planetary carrier 302 form a first module which can be plugged into the cavity which is surrounded by the internal gearwheel 104. In the plugged-in-state, the internal toothing system of the internal gearwheel 104 engages into the external toothing systems of the planetary gearwheels 105, as a result of which positively locking connection is achieved.

(17) The planetary carrier 302 can be fastened releasably to the work machine shaft 303. Both assembly and dismantling of the planetary transmission are simplified as a result. In a first step, the planetary carrier 302 with the planetary shaft 301 fastened thereto and the planetary gearwheels 105 can be fastened as a first module to the work machine shaft in a releasable manner. Subsequently, the remaining components of the planetary transmission 300 can be fastened to the first module. Said modular design simplifies, in particular, the maintenance of the planetary transmission 300.

(18) The first module which is fastened to the work machine shaft 303 can be removed from the planetary transmission 300 in a simple way, since the positively locking connection of the planetary gearwheels 105 to the internal gearwheel 104 can be released. The assembly, maintenance and repair of the planetary transmission 300 are therefore simplified considerably, since the plug-in connection between the first module and the internal gearwheel 104 can be released without great complexity.

(19) FIG. 5 shows the planetary transmission 300 in a state, in which the connection between the first module, which comprises the planetary gearwheels 105, the planetary shafts 301 and the planetary carrier 302, and the internal gearwheel 104 is released. The first module can thus be removed easily from the cavity which is surrounded by the internal gearwheel 104. Since the connection between the first module and the internal gearwheel 104 is a plug-in connection, the release of said connection can be carried out particularly simply. The maintenance, repair, assembly and dismantling of the first module can thus be carried out without great complexity.

(20) The system comprising the work machine and the planetary transmission can be assembled in the following way. First of all, the planetary gearwheels 105, the planetary shafts 301 and the planetary carrier 302 are assembled as a first module. The first module is then fastened releasably to the work machine shaft 303. Subsequently, the first module is fastened releasably to the internal gearwheel 104. Said assembly can be carried out particularly easily, since the first module can simply be pushed partially into the cavity which is surrounded by the internal gearwheel 104, and configures a positively locking connection to the internal gearwheel 104 there. It goes without saying that, as an alternative, the internal gearwheel 104 with the remaining components of the planetary transmission 300 which are fastened thereto can also be pushed over the first module. A positively locking connection between the first module and the internal gearwheel 104 can also then be configured, by the external toothing systems of the planetary gearwheels 105 engaging into the internal toothing system of the internal gearwheel 104.

LIST OF DESIGNATIONS

(21) 100 Planetary transmission (prior art) 101 Work machine 102 Drive shaft 103 Sun gearwheel 104 Internal gearwheel 105 Planetary gearwheel 106 Planetary shaft 107 Planetary carrier 108 Flywheel 200 Bearing means 300 Planetary transmission 301 Planetary shaft 302 Planetary carrier 303 Work machine shaft 400 End 401 Securing ring K Clutch B Brake