DE102017109027A1 - Bearing fixation in a hydrodynamic machine - Google Patents

Abstract

The invention relates to a hydrodynamic machine comprising a structural unit for mounting in a stator housing. This assembly essentially consists of a first unit, comprising a rotor housing, a rotor, a main shaft part with a stop surface in a first parting plane and a bearing arranged between the rotor housing and main shaft part bearings, and a second unit comprising a bearing bell, a bearing carrier with a stop surface in a second parting plane, and arranged between bearing bell and bearing support bearing.
To ensure the function is intended to screw the units by means of a central screw and to arrange an intermediate ring between the units, which space the units so that a required bearing clearance is ensured.

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.

However, the spring assembly also allows limited axial movement of the bearing or the drive shaft and all coupled to the drive shaft components. The mobility thus enabled can lead to the preload of the bearings not being optimal in all operating conditions.

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.

One of the objects of the invention is to propose a simplified structure which facilitates the assembly of the hydrodynamic retarder and ensures the function.

According to the invention this object is achieved with a hydrodynamic machine according to claim 1 and the assembly method according to claim 5. Further advantageous embodiments and preferred variants of the solution are described in the subclaims dependent thereon.

According to the invention, a hydrodynamic machine is proposed, comprising a structural unit for mounting in a stator housing. This assembly essentially consists of a first unit comprising a rotor housing, a rotor, a main shaft part with a stop surface in a first parting plane and a bearing arranged between the rotor housing and the main shaft part bearing, and a second unit comprising a bearing bell, a bearing carrier with a stop surface in a second parting plane, and arranged between bearing bell and bearing support bearing. To ensure the function is intended to screw the units by means of a central screw and to arrange an intermediate ring between the units, which spaces the units so that a required bearing clearance is ensured. By using a matched to the tolerances of the assemblies intermediate ring the installation situation of the bearings is precisely defined and it can be set a certain clearance or a required preload.

Furthermore, centering lugs can be provided on the stator and bearing carrier, which ensures radial centering of the units relative to one another.

In one embodiment, the main shaft part may have a threaded portion on which a rotor is rotatably mounted and axially movable. Furthermore, the bearings can be designed as a tapered roller bearing.

• - Vormontage einer ersten Einheit, umfassend ein Rotorgehäuse, ein Rotor, ein Hauptwellenteil mit einer Anschlagfläche in einer ersten Trennebene und ein zwischen Rotorgehäuse und Hauptwellenteil angeordneten Lager;
• - Vormontage einer zweiten Einheit, umfassend eine Lagerglocke, ein Lagerträger mit Anschlagfläche in einer zweiten Trennebene und ein zwischen Lagerglocke und Lagerträger angeordneten Lager;
• - bestimmen des Spaltesmaßes, für den montierten Zustand der Einheiten, zwischen der ersten und zweiten Trennebene bzw. Anschlagflächen;
• - Verschrauben der ersten und zweiten Einheit mittels einer Zentralschraube, wobei ein Zwischenring zwischen Hauptwelle und Lagerträger angeordnet wird, wobei dessen Dicke auf Basis des bestimmten Spaltmaßes gewählt wird, so dass ein definiertes Lagerspiel erreicht wird.

The advantageous assembly method according to the invention of a hydrodynamic machine, in which a structural unit is pre-assembled for mounting in the stator housing, comprises the following steps:

• - Pre-assembly of a first unit, comprising a rotor housing, a rotor, a main shaft part having a stop surface in a first parting plane and a bearing arranged between the rotor housing and the main shaft part bearing;
• - Pre-assembly of a second unit, comprising a bearing bell, a bearing carrier with abutment surface in a second parting plane and arranged between bearing bell and bearing support bearing;
• determining the gap dimension, for the mounted state of the units, between the first and second parting planes or abutment surfaces;
• - Screwing the first and second unit by means of a central screw, wherein a Intermediate ring between the main shaft and bearing carrier is arranged, wherein the thickness is selected based on the specific gap dimension, so that a defined bearing clearance is achieved.

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.

• 1 Retarder im Schnitt
• 2 Detail der Schnittstelle

These show in

• 1 Retarder on average
• 2 Detail of the interface

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 It is not difficult to deduce, a certain sequence must be observed during assembly to allow assembly. The drive shaft 5 is 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 braced in the installed state against each other or positioned so that no axial play, a bias or a desired game 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 comprises 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 be used to measure the required thickness of the intermediate ring from the masses 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 the distance of the bearings 7 . 8th determines each other.

In 2 the interface between the units is shown in detail. The intermediate ring 22 is between the stop surfaces 24 and 25 arranged.

The stop surface forms 24 at the main shaft part 10 the first parting plane and the abutment surface 25 on the bearing carrier 12 the second parting plane. The distance 26 between the stop surfaces 24 . 25 is the measure for the intermediate ring 22 , In order to determine this distance, a method for assembling the hydrodynamic machine is provided, wherein a first unit comprising the rotor housing 4 , the rotor 1 , the main shaft part 10 with the stop surface 24 in the first parting plane and between the rotor housing 4 and main shaft part 10 arranged bearings 7 to assemble. Thereafter, the pre-assembly of a second unit, comprising the bearing bell takes place 2 , the bearing carrier 12 with the stop surface 25 in a second parting plane and one between bearing bell 21 and bearing carrier 12 arranged bearings 8th ,

Subsequently, the necessary Spaltesmaß 26 determined or calculated by the units as described pre-assembled in a device are measured and then from the measured values a measure of the assembled state of the units, between the first and second parting plane or abutment surfaces 24 . 25 is calculated.

The first and second unit is then connected by means of a central screw 5 bolted to a unit or rotor group, wherein the intermediate ring 22 between main shaft 10 and bearing carrier 12 is arranged, whose thickness based on the specific gap dimension 26 is selected, so that a defined bearing clearance is achieved. The rotor group can then into the stator housing 4 be used.

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

26

clearance

27

centering

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 [0006]

Claims (5)

Hydrodynamic machine, in particular hydrodynamic retarder, comprising a structural unit for mounting in a stator housing (9), comprising a first unit, comprising a rotor housing (4), a rotor (1), a main shaft part (10) with a stop surface (24) in one first parting plane and a between rotor housing (4) and main shaft part (10) arranged bearing (7), comprising a second unit comprising a bearing bell (21), a bearing support (12) with a stop surface (25) in a second parting plane and between Bearing (21) and bearing support (12) arranged bearing (8), wherein the units are screwed by means of a central screw (5) and between the units an intermediate ring (22) is arranged, which spaces the units such that a required bearing clearance is ensured , Hydrodynamic machine according to Claim 1 , characterized in that on the stator (2) and bearing support (21) centering lugs are provided which ensures a radial centering of the units to each other. Hydrodynamic machine according to Claim 1 , characterized in that the main shaft part (10) has a threaded portion (26) on which a rotor (1) is rotatably mounted and axially movable. Hydrodynamic machine according to Claim 1 , characterized in that the bearings (7, 8) are tapered roller bearings. Method for mounting a hydrodynamic machine, in particular a hydrodynamic retarder, in which a structural unit for mounting in a stator housing (9) is pre-assembled, with the following steps: Pre-assembly of a first unit comprising a rotor housing (4), a rotor (1), a main shaft part (10) with a stop face (24) in a first parting plane and a bearing (7) between the rotor housing (4) and main shaft part (10) ); - Pre-assembly of a second unit, comprising a bearing bell (21), a bearing support (12) with stop surface (25) in a second parting plane and between bearing bell (21) and bearing support (12) arranged bearing (8); - Determine the necessary Spaltesmaßes (26), for the assembled state of the units, between the first and second parting plane or the abutment surfaces (24, 25); - Screwing the first and second units by means of a central screw (5), wherein an intermediate ring (22) between the main shaft (10) and bearing support (12) is arranged, the thickness of which is selected based on the specific gap dimension (26), so that a defined bearing clearance is achieved.

Images