DE102021207254A1 - Shaft arrangement and compressor - Google Patents

Abstract

The present invention relates to a shaft arrangement comprising a shaft (1), an eccentric body (2), a counterweight (3) and a bearing (4), the counterweight (3) being accommodated in the bearing (4), and the use of a Shaft arrangement according to at least one of the preceding claims in a compressor, preferably of radial piston design.

Description

The present invention relates to a shaft arrangement according to the preamble of claim 1 and a compressor, in particular a radial piston compressor, according to the preamble of claim 5.

A shaft arrangement essentially comprises a shaft, an eccentric body, a counterweight and a bearing.

It is known in the prior art that the balancing weight, similar to crankshafts, is attached outside of the bearing or next to the bearing.

Accordingly, due to the counterweight attached next to the bearing, it can be assumed that the bearing and counterweight will require axial space. There is also the risk that a freely oscillating, oscillating mass will arise if a balancing weight is arranged outside of the bearing or bearing.

The object of the present invention is to propose an improved shaft arrangement, in particular to propose a space-saving shaft arrangement and/or to avoid or largely exclude a freely swinging, oscillating mass.

According to the invention, this object is achieved by a shaft arrangement having the characterizing features of claim 1. Because the balancing weight is accommodated in the bearing, the problems outlined above can be overcome, or at least mitigated. In particular, less installation space, in particular axial installation space, is required since the bearing and the counterweight share the installation space. Also, no or at least a few freely vibrating, oscillating masses are to be expected. In other words, a main bearing of the eccentric shaft is mounted on a balance weight, which sits on the eccentric shaft.

Further advantageous refinements of the proposed invention result in particular from the features of the dependent claims. The objects or features of the various claims can in principle be combined with one another as desired.

In a further advantageous embodiment of the invention, it can be provided that the bearing is a roller bearing, in particular a ball bearing, comprising an inner ring and an outer ring, with the balancing weight being accommodated in the inner ring. The length and position of the counterweight is basically specified by design and calculation.

In a further advantageous embodiment of the invention it can be provided that a channel is arranged in the counterweight. In this way, for example, an intake gas flow can be passed through, so that, for example, additional bores in the crankcase can be saved. In other words, the counterweight is additionally used for the throughflow of the intake gas flow. This can result in better flow through the engine parts and better cooling of the components. A flow can generally be made possible or a better flow in the compressor can be made possible.

In a further advantageous embodiment of the invention, it can be provided that the counterweight is designed in one piece with the shaft. One advantage is the ease of manufacture. The processes, such as kneading and compressing, are known per se to those skilled in the art.

A further object of the present invention lies in particular in proposing an advantageous compressor, in particular a radial piston compressor.

According to the invention, this object is achieved by a compressor having the characterizing features of claim 5. In particular when the proposed shaft arrangement is used in a compressor, preferably in a radial piston design, the advantages of the shaft arrangement outlined above can become particularly advantageous.

Further advantageous refinements of the proposed invention result in particular from the features of the dependent claims. The objects or features of the various claims can in principle be combined with one another as desired.

In an advantageous embodiment of the invention, it can be provided that the counterweight is arranged in the axial direction between the electric motor and the piston/working chamber combination.

• 1 eine erfindungsgemäße Wellenanordnung, insbesondere Exzenterwellenanordnung, in einer Ansicht von Vorne;
• 2 ein Schnitt „A-A“ gemäß 1;
• 3 eine perspektivische Ansicht auf eine erfindungsgemäße Wellenanordnung;
• 4 eine geschnittene perspektivische Ansicht auf eine erfindungsgemäße Wellenanordnung;
• 5 ein erfindungsgemäßer Kompressor, insbesondere in Radialkolbenbauweise, mit einer erfindungsgemäßen Wellenanordnung.

Further features and advantages of the present invention become clear from the following description of preferred exemplary embodiments with reference to the attached figures. show in it

• 1 a shaft arrangement according to the invention, in particular an eccentric shaft arrangement, in a front view;
• 2 a cut “AA” according to 1 ;
• 3 a perspective view of a shaft assembly according to the invention;
• 4 a sectional perspective view of a shaft assembly according to the invention;
• 5 a compressor according to the invention, in particular in a radial piston design, with a shaft arrangement according to the invention.

reference list

1

Wave

2

eccentric body

3

counterweight

4

warehouse

5

Piston-working chamber combination

6

lid

7

Housing

8th

electric motor

9

compressor

31

fluid channel

41

inner ring

42

outer ring

43

rolling elements

f

fluid flow

First, reference is made to FIG.

A shaft arrangement according to the invention essentially comprises a shaft 1, an eccentric body 2, a counterweight 3 and a bearing 4. The axial direction is defined by the longitudinal axis of the shaft 1.

Provision can preferably be made for the counterweight 3 to be designed in one piece with the shaft 1 . However, a separate configuration is also conceivable.

The bearing 4 can be, for example, a rolling element, in particular a ball bearing, comprising an inner ring 41, an outer ring 42 and a rolling element 43 arranged correspondingly between the inner ring 41 and the outer ring 42.

According to the invention, it is provided that the counterweight 3 is accommodated in the bearing 4 . In particular, it is provided that the counterweight 3 is almost flush with the bearing 4 in the axial direction. As a result, the counterweight 3 can be integrated into the bearing 4 to a certain extent or can be flush with the bearing 4 axially, ie it cannot protrude beyond the bearing 4 in the axial direction. Less installation space, in particular axial installation space, is also required and/or no or at least little freely oscillating, oscillating mass is to be expected which would be due to the counterweight 3 as such. Completing the balancing weight with the bearing is particularly advantageous, but not mandatory. A length of the shaft can be specified in particular by FE calculation in order to achieve mass balancing, for example.

With regard to the roller bearing outlined above, provision can advantageously be made for the counterweight 3 to be accommodated in the inner ring 41 , in particular not protruding beyond the inner ring 41 of the bearing 4 in the axial direction.

In an advantageous embodiment of the shaft arrangement, provision can be made for the counterweight 3 to be equipped with at least one channel 31 or a recess, which allows fluid to flow through in the axial direction. In this way, for example, an intake gas flow can be passed through, so that, for example, additional bores in the crankcase can be saved. In the area of the counterweight in which the channel is formed, the counterweight can have only one web which ensures that the bearing is fastened/supported on the shaft.

The shaft arrangement can preferably be used in a compressor 9, preferably of radial piston construction. This is where the advantages of the shaft arrangement come to light in a particularly advantageous manner. In 5 such a compressor 9 is shown, for example. The compressor 9 has, for example, a shaft 1 with an eccentric 2 , the eccentric 2 driving pistons of a piston-working chamber combination 5 . A fluid F is compressed in the piston-working chamber combination 5 . The shaft 1 is rotatably accommodated in bearings 4 . At least one of the bearings 4 is preferably designed as a roller bearing. An imbalance occurring during operation of the compressor 9 or vibrations occurring in the compressor 9 can be at least partially compensated for or offset by at least one balancing weight 3 arranged on the shaft 1 . The compressor 9 is closed off by a cover 6 and a housing 7 . The fluid F guided or circulated within the compressor can advantageously flow through the channel 31 through the counterweight 3, whereby the fluid flow of the compressor is improved. If the fluid F is used, for example, to lubricate or cool the compressor 9 or its components, this can now be optimized. Also the flow against a piston valve the piston-working chamber combination can be improved in this way. The optimal position of the balancing weight 3 is preferably determined by simulation or calculation. An electric motor 8 arranged within the housing 7 drives the compressor 9 .

6 shows a further embodiment of the compressor 9, the counterweight 3 here, seen axially along the shaft 1, being arranged between the electric motor 8 and the piston/working chamber combination 5. Especially with such an arrangement of the balancing weight, it is evident that the formation of a channel 31 through which the fluid F can flow is particularly advantageous for the fluid flow in the compressor.

Features and details that are described in connection with a method also apply, of course, in connection with the device according to the invention and vice versa, so that with regard to the disclosure of the individual aspects of the invention, mutual reference is or can always be made. In addition, an optionally described method according to the invention can be carried out with the device according to the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprises" and/or "comprising" when used in this specification specify the presence, but not the presence, of the recited features, integers, steps, operations, elements, and/or components or exclude the addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Claims (6)

Shaft arrangement comprising a shaft (1), an eccentric body (2), a counterweight (3) and a bearing (4), characterized in that the counterweight (3) is accommodated in the bearing (4). wave arrangement claim 1 , characterized in that the bearing is a roller bearing, in particular a ball bearing, comprising an inner ring (41) and an outer ring (42), the counterweight (3) being accommodated in the inner ring (41). Shaft arrangement according to at least one of the preceding claims, characterized in that a channel (31) is arranged in the counterweight (3). Shaft arrangement according to at least one of the preceding claims, characterized in that the balancing weight (3) is designed in one piece with the shaft (1). Compressor, in particular radial piston compressor, characterized by at least one shaft arrangement according to at least one of the preceding claims. compressor after claim 5 , comprising an electric motor and at least one of the piston-working space combination, characterized in that the balancing weight is arranged in the axial direction between the electric motor (8) and the piston-working space combination (5).

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