Hydraulic rotary motor

Abstract

A hydraulic rotary motor, in particular to a stewing gear for elevating plant such as excavator grabs, etc., comprising a housing in which a rotor is rotatably received as well as a ring piston having an inner toothed arrangement and an outer toothed arrangement which is seated between the rotor and the housing so that displacement chambers are formed between the ring piston and an outer toothed arrangement of the rotor and / or an inner toothed arrangement of the housing, with a first motor connector being rotatably fixedly connected to the housing and a second motor connector being rotatably fixedly connected to the rotor. The hydraulic rotary motor is characterized in that the rotor is axially and radially supported at the housing via plain bearings and the second motor connector connected to the rotor is solely supported via the plain bearings at the housing.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a hydraulic rotary motor, in particular to a slewing gear for elevating plant such as excavator grabs, etc., comprising a housing in which a rotor is rotatably received as well as a ring piston having an inner toothed arrangement and an outer toothed arrangement which is seated between the rotor and the housing so that displacement chambers which can be filled with pressure fluid are formed between the ring piston and an outer toothed arrangement of the rotor and / or an inner toothed arrangement of the housing, with a first motor connector being rotatably fixedly connected to the housing and a second motor connector being rotatably fixedly connected to the rotor.[0003]2. Description of the Prior Art[0004]Such a hydraulic rotary motor is known from DE 33 42 131 A1. DE 37 29 049 C1, DE 2 365 057 or DE 196 05 879 A1 also show hydraulic rotary motors of this type in which a ring piston orbits...

AI Technical Summary

Benefits of technology

[0006]The present invention wants to provide a remedy here. It has the underlying object of providing an improved rotary motor of the said kind which avoids disadvantages of the prior art and further develops the latter in an advantageous manner. A compact rotary motor of simple construction and short axial design should preferably be provided which can be manufactured in a cost-favorable manner by a low production effort and use of material.

[0008]In the rotary motor in accordance with the invention, a separate support of the motor shaft by the known tapered roller bearings is omitted. It is rather the case that the forces and torques introduced from the motor connector connected to the respective elevating plant are directly intercepted via the rotor itself. In accordance with the invention, the rotor is supported axially via plain bearings and radially at the housing. The second motor connector connected to the rotor for the fastening of the elevating plant is supported via the rotor and the plain bearings at the housing supporting it. By the omission of separate shaft bearings in the form of tapered roller bearings or other roller bearings and by the interception of the forces and torques via the rotor itself and corresponding plain bearings free of roller bearings, the axial construction length of the motor can be substantially shortened, on the one hand. On the other hand, the production effort and the use of material are reduced by the dispensing with of the separate roller bearings for the motor shaft, whereby cost savings can be achieved. The second motor connector connected to the rotor can in particular be rigidly connected to the rotor and be supported exclusively via the plain bearings engaging at the rotor.

[0014]The bearing of the rotor advantageously dispenses with the conventional distributor plates or pressing plates which are guided movably in the housing and are known, for example, from the construction in accordance with DE 33 42 131. The production effort and use of material can thereby be further reduced.

[0021]It has proved to be particularly advantageous for the lubrication of the axial plain bearing surfaces for transverse bores to be provided in the meshing noses of the rotor which open onto the axial plain bearing surfaces of the rotor. Oil can thereby flow from the one side of the rotor to the other in order to ensure a sufficient oil supply on both sides of the meshing noses of the rotor on which the axial plain bearing surfaces are provided.

[0025]An oil guiding system or passage system is advantageously also provided for the lubrication of the ring piston for this. To transport the oil onto the axial surfaces of the ring piston, the ring piston thickness can reduce toward the edges of the outer toothed arrangement, with bevels, for example in the form of a chamfer toward the outer meshing noses, in particular being provided at the rims of the axial plain bearing surfaces of the ring piston. This facilitates the oil being able to move onto the plain bearing surfaces of the ring piston. The outwardly conical shape of the piston moreover ensures a flooding and centering of the ring piston. Furthermore, the parallelism and angle defects have a smaller effect.

Problems solved by technology

However, what is disadvantageous with this support of the motor shaft via tapered roller bearings is, however, the large axial construction length of the motor which hereby arises.

In addition, the production and assembly effort is relatively high due to the corresponding components.

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