DE102017109014A1 - Hydrodynamic machine with side channel pump - Google Patents

Abstract

The invention relates to a hydrodynamic machine, in particular hydrodynamic retarder, with a bladed rotor and a bladed stator, which together form a toroidal working space, which can be filled with a working fluid to form therein a hydrodynamic circulation flow for transmitting a drive torque. In this case, the rotor is driven by a drive shaft of the hydrodynamic machine via an axis of rotation, which is mounted in the retarder housing via two bearings. To simplify the construction and to improve the assembly, it is proposed to make the drive shaft in several parts, this one main shaft part with a first bearing point, comprises a bearing support with a second bearing and a central screw, and the central screw has a bearing, which is suitable for the rotationally fixed coupling of a pump. In this simplified structure, the coupling piece can be omitted.

Description

The present invention relates to a hydrodynamic machine, in particular a hydrodynamic retarder according to the preamble of claim 1.

Hydrodynamic machines or hydrodynamic retarders generally include a housing, a rotor unit, a stator, an external working medium circuit and a cooling circuit. All components can be accommodated in one or the retarder housing, wherein the retarder housing can be composed of several housing parts.

The rotor unit of the retarder is rotatably mounted in the retarder housing and comprises a shaft on which a rotor is positioned. The rotor can be fixed on the shaft or alternatively arranged axially displaceable. The axial displacement is generally characterized in that the shaft and the rotor are coupled via a swirl toothing. The swirl toothing, in conjunction with a spring, causes the rotor to be moved into a braking position during braking operation and into an idling position during non-braking operation. Such a retarder is for example in the DE 10 2007 029 018 A1 disclosed.

The DE 10 2013 208 980 A1 for example, discloses a rotor unit which is preassembled and inserted into a retarder housing. To compensate for tolerances and to bias the bearings against each other a spring assembly is provided.

Another function of the drive shaft is the drive of a side channel pump. Usually, a coupling piece is provided, which is driven by means of the drive shaft. Such a coupling piece is for example from the DE 10 2014 202 366 A1 known. In this case, the coupling piece has a bearing point which can be inserted into a receiving bore of the pump wheel of the pump.

The side channel pump is provided to actively draw working fluid from the working space, with an active promotion of working fluid in the working space is conceivable.

One of the objects of the invention is to propose a simplified and less expensive construction, which facilitates the assembly of the hydrodynamic retarder.

According to the invention, this object is achieved with a hydrodynamic machine according to claim 1. Further advantageous embodiments and preferred variants of the solution are described in the subclaims dependent thereon.

According to the invention, a hydrodynamic machine, in particular a hydrodynamic retarder, with a bladed rotor and a bladed stator, which together form a toroidal working space which can be filled with a working medium in order to form a hydrodynamic circulation flow therein for transmitting a drive torque, is proposed. The rotor is driven by a drive shaft of the hydrodynamic machine via a rotation axis which is mounted in the retarder housing via two bearings.

To simplify the construction and to improve the assembly is proposed to perform the drive shaft in several parts, this comprises a main shaft part with a first bearing, a bearing carrier with a second bearing and a central screw, and the central screw has a bearing point for non-rotatable coupling of a pump suitable is. In this structure, the coupling piece can be omitted, which greatly simplify the construction and installation of the retarder.

In a preferred embodiment, the bearing adjoins the head end of the central screw, so that it can be inserted for coupling into a receiving bore of a pump wheel of the pump.

Furthermore, a pressure relief passage may pass through the drive shaft connecting a pressure relief space behind the working space to an inlet space in front of the working space, the passage having two radially extending passage portions. In particular, the outlet opening of a channel section may be provided in the screw head of the central screw or between the screw head and the bearing point.

Further features of the retarder according to the invention and further advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings.

The invention will be explained in more detail with reference to a sketch. In 1 a retarder is shown in section. The essential structure is identical to the structure of a retarder according to the StdT. Thus, the housing of the retarder consists of two parts, the rotor housing 4 and the stator housing 9 , In the stator housing 9 is the stator 3 and the bearing bell 21 used.

The drive shaft 5 is about the camp 7 in the rotor housing 4 and about the camp 8th , the bearing bell 21 and the stator 2 in the stator housing 9 stored. The drive is via the drive wheel 23 , which engages in the transmission of the motor vehicle. How out 1 is not difficult to find, must be the assembly is followed a certain order to allow the assembly. To enable the construction is the drive shaft 5 constructed in several parts, consisting of main shaft part 10 a bearing carrier 12 and a central screw 14 ,

The two camps 7 . 8th are tapered roller bearings which are clamped in the installed state against each other or positioned so that no axial play is present.

For assembly, in a first step, two units are assembled and measured. In this case, the first unit substantially comprises the rotor housing 4 , the rotor 1 , the main shaft part 10 and that between the rotor housing 4 and main shaft part 10 arranged bearings 7 , as well as the drive wheel 23 ,

The second unit encloses the bearing bell 21 , the stator 2 and the bearing carrier with the between bearing bell 21 and bearing carrier 12 arranged bearings 8th ,

Once these units have been assembled, they will measure to the required thickness of the intermediate ring 22 to investigate. Thus, in a simple way, the bearing clearance or the bearing preload for the bearings 7 . 8th be determined taking into account the manufacturing tolerances.

From the two units, the rotor group is assembled and by means of the central screw 14 screwed, with the intermediate ring 22 determines the distance between the bearings to each other.

The rotor unit is then inserted into the stator housing 3 used. The impeller of the pump 20 can easily with this structure on the bearing 19 the central screw 14 be deferred. Alternatively, the pump may already be in the stator housing 3 be mounted and the bearing point 6 at the screw head 18 can be plugged into the impeller.

By eliminating the previously used intermediate piece assembly is much easier. The pressure relief channel 15 through the drive shaft 5 now connects directly the pressure relief space 16 behind the workroom 3 with the inlet room 17 in front of the workroom 3 wherein the channel has two radially extending channel sections 15.1 . 15.2 having.

LIST OF REFERENCE NUMBERS

1

rotor

2

stator

3

working space

4

rotor housing

5

drive shaft

6

axis of rotation

7

camp

8th

camp

9

stator

10

Main shaft part

11

depository

12

bearing bracket

13

depository

14

central screw

15

Pressure relief duct

15.1, 15.2

channel sections

16

Pressure relief chamber

17

inlet space

18

screw head

19

depository

20

pump

21

bearing bell

22

intermediate ring

23

drive wheel

24

stop surface

25

stop surface

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007029018 A1 [0003]
• DE 102013208980 A1 [0004]
• DE 102014202366 A1 [0005]

Claims (6)

Hydrodynamic machine, in particular hydrodynamic retarder, with a bladed rotor (1) and a bladed stator (2) which together form a toroidal working space (3) which can be filled with a working medium to form therein a hydrodynamic circulation flow for transmitting a drive torque, wherein the rotor (1) is driven by a drive shaft (5) of the hydrodynamic machine via an axis of rotation (6) which is mounted in the stator housing (9) via two bearings (7, 8), characterized in that the drive shaft (5) comprising a plurality of main shaft part (10) with a first bearing point (11), a bearing carrier (12) with a second bearing point (13) and a central screw (14), wherein the central screw (14) has a bearing point (19), which is suitable for the rotationally fixed coupling of a pump (20). Hydrodynamic machine according to Claim 1 , characterized in that the bearing point (19) adjoins the head end of the central screw (14) and can be inserted for coupling into a receiving bore of a pump wheel of the pump. Hydrodynamic machine according to Claim 1 characterized in that a pressure relief passage (15) passes through the drive shaft (5) connecting a pressure relief space (16) behind the work space (3) to an inlet space (17) in front of the work space (3), the passage being two radially extending ones Channel sections (15.1, 15.2) has. Hydrodynamic machine according to Claim 2 , characterized in that the outlet opening of a channel section (15.2) in the screw head (18) of the central screw (14) or between the screw head and bearing (19) is provided. Hydrodynamic machine according to Claim 1 , characterized in that the bearings (7, 8) are tapered roller bearings. Hydrodynamic machine according to Claim 4 , characterized in that the bearing point (19) is designed such that the impeller is mounted axially displaceably on the bearing point (19).

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