WO2018177475A1

WO2018177475A1 - Multi-gearwheel and transmission arrangement having said multi-gearwheel

Info

Publication number: WO2018177475A1
Application number: PCT/DE2018/100277
Authority: WO
Inventors: Franz Kurth
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2017-03-29
Filing date: 2018-03-27
Publication date: 2018-10-04
Also published as: DE102017106699A1

Abstract

The invention relates to a multi-gearwheel (4) for a transmission arrangement (1) having a first transmission gearwheel portion (6) and having a second transmission gearwheel portion (7), wherein the first and the second gearwheel portion (6, 7) are connected to each other in a rotationally fixed manner by an intermediate portion (9), wherein the first and the second transmission gearwheel portion (6, 7) are produced from a metallic material, having a damping portion (12) arranged between the first transmission gearwheel portion (6) and the intermediate portion (9), wherein the damping portion (12) is designed as a damping ring, wherein the damping ring is formed concentrically between the first transmission gearwheel portion (6) and the intermediate portion (9) and mechanically separates and/or spaces apart and/or insulates them from each other.

Description

Multiple gear and gear arrangement with the multiple gear

The invention relates to a multiple gear for a transmission assembly having a first Getrieberadabschnitt and with a second Getrieberadabschnitt, wherein the first and the second Getrieberadabschnitt are rotatably connected to each other via an intermediate portion, wherein the first and the second Getrieberadabschnitt are made of a metallic material. The invention also relates to a gear arrangement with the multiple gear.

In conventional transmission applications, the transmission components are metallic. This makes it possible to rigidly transmit torques, for example for driving vehicles. In some applications, however, it may be useful to integrate resilient and / or damping elements in the torque path.

For example, the article "Verbundzahnräder mit Hochleistungspolymeren" from the ATZ - Automobiltechnische Zeitschrift, issue 2/2012 by the authors: Prof. Dr.-Ing. Bernd-Robert Höhn, Prof. Dr.-Ing. Karsten Stahl, Dr.-Ing Michael Otto, Dipl.-Ing. (FH) Christoph Nitschein A gear which has a hub made of a metallic material, an intermediate ring made of a polymer and an outer ring made of a metallic material This can have a positive effect on the vibration behavior and thus on the noise behavior.

The document WO 200248580 A1 discloses a gearwheel with a hub and an outer ring made of metal and with a plastic layer arranged therebetween.

The document EP 1595089 A1, which probably forms the closest prior art discloses a tandem gear, wherein the tandem gear two Gear portions, wherein the gear portions are rotatably connected to each other via a plastic hub.

US 2 307 129 A describes a double gear with a damping ring which is connected to an outer ring and an inner body.

DE 102 46 71 1 A1 describes a double gear with a damping element.

It is an object of the present invention to propose a multiple gear for a gear assembly, which has a different operating behavior. This object is achieved by a multiple gear with the feature of claim 1 and by a gear assembly having the features of claim 6.

The invention relates to a multiple gear, which is suitable and / or designed for a gear arrangement. In the general embodiment of the invention, the gear assembly may be formed for any application. However, the transmission arrangement is preferably designed for a vehicle, in particular for a drive train of a vehicle.

The multiple gear has first and second gear portions. The first and second Getrieberadabschnitt may have a same pitch circle diameter. However, it is preferred that the first of the second gear portion has different Teilkreismesser. If appropriate, the first and / or the second gear wheel section each have a circumferential toothing, in particular a spur gear toothing. In operation, the multiple gear and / or the first gear portion and / or the second gear portion may be rotated about a common axis of rotation. The first and second Getrieberadabschnitt are made of a metallic material, preferably steel. In particular, the toothing is made of the metallic material. The multiple gear has an intermediate portion, the intermediate portion non-rotatably connecting the first gear portion and the second gear portion. Preferably, the intermediate portion bridges an axial distance between the first gear portion and the second gear portion. The intermediate portion preferably includes a tubular portion disposed between the first and second gear portions.

The multiple gear has a damper portion, wherein the damper portion is disposed between the first gear portion and the intermediate portion. In particular, the damping section is arranged such that a torque, in particular a torque, in particular a traction torque, which is introduced via the first Getrieberadabschnitt, is passed via the damping section to the intermediate section.

In the context of the invention it is proposed that the damping section is formed as a damping ring. In particular, the damping ring is arranged coaxially with the axis of rotation. The damping ring is formed concentrically between the first gear portion and the intermediate portion. The damping ring separates, objects and / or isolates the first gear portion from the intermediate portion so that direct contact between the materials of the first gear portion and the intermediate portion is avoided. Considering the multiple gear as a kinematic chain, the damping portion is serially disposed between the first gear portion and the intermediate portion.

An advantage of the invention is that with the multiple gear a transmission component is proposed, which has a modified damping behavior compared to the prior art. Further, the multiple gear is enabled to improve load sharing between the first gear portion and the second gear portion. Due to this technical effect, the load capacity of both Getrieberadabschnitte improved. In particular, the multiple gear has the advantage that this is executed vibration damping and noise damping. In particular, a structure-borne sound transmission can be reduced by the multiple gear. Furthermore, the multiple gear allows to improve a backlash in the transmission assembly. By or in addition to the improved backlash, torsional vibrations in the transmission assembly are reduced.

In a preferred embodiment of the invention, the damping portion is formed as a plastic part. The plastic may in particular be thermoplastics, thermosets or elastomers. Particularly preferably, the damping section is formed from a polymeric material and / or from polymer. Alternatively or additionally, the damping section is formed from a glass fiber reinforced polyphthalamide (PPA). This material is also referred to as a high performance polymer.

In a preferred embodiment of the invention, the intermediate portion and the second Getrieberadabschnitt are integrally formed, in particular integrally. In particular, the intermediate portion and the second gear portion are realized as a common material portion. By this development, a particularly rigid transition between the intermediate portion and the second Getrieberadabschnitt is formed. By contrast, the transition from the intermediate section to the first gear section is formed elastically and / or resiliently via the damping section.

In a preferred realization of the invention, the damping section forms an inner interface with the intermediate section. In addition, the damping portion forms an outer interface with the first Getrieberadabschnitt. Both interfaces are realized so that they are positively formed in the direction of rotation about the axis of rotation. For example, it can be provided that the first gear portion has an internal toothing and the damping portion has a corresponding, in particular complementary thereto formed external toothing. Alternatively or additionally may be provided be that the damping portion has a further internal toothing and the intermediate portion has a further external toothing, which is designed corresponding, in particular complementary to the further internal toothing. Optionally, it may be provided that the damping section has side ring sections, so that the toothing of the first gear wheel section or of the intermediate section are positively caught in the damping section with respect to an axial direction with respect to the axis of rotation.

In principle, the multiple gear still have a third, fourth or further Getrieberadabschnitt. However, it is particularly preferred that the multiple gear has exactly two Getrieberadabschnitt. In particular, the multiple gear is formed as a double gear and / or as a tandem gear.

In a preferred embodiment, the multiple gear is formed as a double planetary gear, wherein the multiple gear has a through hole extending along the axis of rotation, which is suitable and / or formed for receiving a shaft or axle.

Another object of the invention is formed by a gear assembly, as previously described. The gear assembly has at least one multiple gear, as previously described. Optionally, the gear assembly may also include a plurality of such multiple gears.

It is particularly preferred that in the gear arrangement, a torque path is guided via the first gear portion, the damping portion, the intermediate portion to the second gear portion or in the opposite direction. In particular, the torque path is formed as a power path. In the event that the gear assembly is designed as a transmission arrangement for driving a vehicle, a traction torque, in particular a main traction torque of the vehicle is passed over the torque path. In a preferred embodiment of the invention, the gear arrangement is designed as a transmission gear and / or reduction gear.

In a first possible embodiment, the gear arrangement is formed in an electric drive for a vehicle. The electric drive can be designed, for example, as an electrical axis or as a wheel hub drive. In particular, an input of the transmission assembly is operatively connected to an electric motor as a traction motor so that the transmission assembly translates a high speed of the electric motor into a low speed at the output of the transmission assembly.

In a second possible embodiment, the gear arrangement is arranged in a starter unit for an internal combustion engine. Especially in this application, the damping section is particularly advantageous because switching noise when coupling the starter are reduced by the damping section.

A possible constructive embodiment of the gear arrangement provides that this is designed as a planetary drive. The gear arrangement has an input sun gear, a planet carrier, a plurality of multiple gears as planet gears, wherein the multiple gears are rotatably mounted on the planet carrier, on. The first gear portion of the multiple gears meshes with the input sun gear. Furthermore, the gear arrangement has a ring gear, which is arranged stationary. The second gear portion of the multiple gears meshes with the ring gear. The planet carrier is rotatably connected to an output shaft. Thus, the Eingangsonnenrad forms an input to the gear assembly and the output shaft an output from the gear assembly. The pitch diameter of the first gear portion is larger than the pitch diameter of the second gear portion, so that the reduction gear is formed by the gear assembly. The input sun gear and the output shaft are arranged coaxially with each other. Thus, the gear assembly is particularly suitable for use in an electrical axis for a vehicle. Further features, advantages and effects of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Showing:

Figure 1 is a schematic representation of a gear arrangement as an embodiment of the invention;

Figure 2 is a schematic three-dimensional representation of a multiple gear in the figure 1;

FIG. 3 is a schematic sectional view of the multiple gear wheel in FIG. 2.

FIG. 1 shows, in a schematic block diagram, a gear arrangement 1 as a first exemplary embodiment of the invention. The gear arrangement 1 can be used for example in an electrical axis to implement a speed reduction. For example, the gear assembly 1 is preferably directly operatively connected to an electric motor as a traction motor. Alternatively, the transmission assembly 1 may be used in a starter unit to reduce the rotational speed of an electric motor.

The gear arrangement 1 has an input sun gear 2, which is optionally directly or indirectly operatively connected to the electric motor. Particularly preferably, the Eingangsonnenrad 2 is rotatably connected to a rotor shaft of the electric motor. The gear assembly 1 is formed as a planetary gear and has, in addition to the Eingangsonnenrad 2 a planet carrier 3, on which a plurality of multiple gears 4 are rotatably arranged as planetary gears. Each of the multiple gears 4 can be rotated about its own axis of rotation R. The axis of rotation R are preferably distributed in a pitch circle diameter about a main axis H of the gear arrangement 1 regularly in the circumferential direction. The planet carrier 3 is rotatably connected to an output shaft 5 connected. The input sun gear 2 and the output shaft 5 are arranged coaxially with the main axis H.

Each of the multiple gears 4 has a first gear portion 6 and a second gear portion 7. The first and second Getrieberadabschnitt 6, 7 are each formed as gear portions. The first gear portion 6 meshes with the Eingangsonnenrad 2. The gear assembly 1 has a ring gear 8, which is arranged stationary. The ring gear 8 meshes with the second gear portion 7 of the multiple gears 4. The first gear portion 6 and the second gear portion 7 are rotatably connected to each other via an intermediate portion 9. The multiple gear 4 has a through hole or at least one blind hole, wherein in the bore a bolt 10 is received, which is fixed to the planet carrier 3. For a detailed description of the multiple gear 4 reference is made to Figures 2 and 3.

2 shows a three-dimensional exploded view of the multiple gear 4 from the gear assembly 1 of the preceding figure. From the illustration it can be seen that the first gear portion 6 is formed as a Stirnzahnradabschnitt with a circumferential toothing, in this example, a circumferential helical toothing. The first gear portion 6 has a receiving opening 1 1, wherein on the radial inside of the first gear portion 6, an internal toothing is formed. The first gear portion 6 is made of a metallic material.

The multiple gear 4 has a damping portion 12, wherein the damping portion 12 is disposed in the receiving opening 1 1. In particular, the damping portion 12 and the first gear portion 6 are arranged coaxially and / or concentrically with each other. The damping portion 12 has an annular shape, wherein on the radial outer side outer toothing is arranged, which is complementary to the internal toothing of the first Getrieberadabschnitts 6, so that the outer toothing of the damping portion 12 and the Internal teeth of the first Getrieberadabschnitts 6 form an outer interface, which leads to a positive coupling between the damping portion 12 and the first Getrieberadabschnitt 6. The first damping portion 12 is formed of a high-performance polymer.

The second gear portion 7 is also formed as a Stirnzahnradabschnitt with a circumferential toothing, in this case a circumferential helical toothing. The second gear portion 7 is formed integrally with the intermediate portion 9. The intermediate section 9 is designed in particular as a hub section.

The damping section 12 has a coupling opening 13, wherein the intermediate section 13 is inserted into the coupling opening 13. In particular, the intermediate section 9 has a further external toothing and the radial inner side of the damping section 12 has a further internal toothing, wherein the further outer toothing and the further inner toothing together form an inner interface. The inner interface forms a positive connection in the circumferential direction between the intermediate portion 9 and the damping portion 12. The further internal toothing is formed complementary to the other external teeth. The inner interface and the outer interface are arranged concentrically with the first gear portion 6.

3 shows the multiple gear 4 in a schematic sectional view in an assembled state. It can be seen that the toothings of the first and second Getrieberadabschnitt 6, 7 are arranged axially offset from one another. The inner interface and the outer interface are disposed at the same axial position as the teeth of the first gear portion 6. In the illustration it can also be seen that the damping portion 12 has side bars 14 a, b, which laterally surround the internal teeth of the first gear portion 6 and the external teeth of the intermediate portion 9, so that the assembly comprising the first gear portion 6, the damping portion 12 and the Intermediate section 9 in the axial direction is positively secured. In particular, it can be seen in FIG. 3 that the intermediate section 9 is formed in one piece with the second gear wheel section 7.

In the synopsis of Figures 2, 3 it can be seen that the damping portion 12 is formed as a ring, in particular as a damping ring. In the embodiment, the axial width of the damping portion 12 is equal to or even smaller than the axial width of the first Getrieberadabschnitts 6 is selected. The second gear portion 7 and the intermediate portion 9 form a one-piece component with a common passage opening for receiving the bolt 10. Thus, the second gear portion 7 and the intermediate portion 9 have a common, free inner diameter. On the radial outer side, on the other hand, the toothing of the second gear wheel portion 7 and the further outer toothing of the intermediate portion 9 are arranged axially adjacent to one another and / or adjacent to one another.

In the gear arrangement 1, it is provided that a torque path extends from the first gear portion 6 via the damping portion 12 to the intermediate portion 9 and then further to the second gear portion 7. In the specific embodiment shown in FIG. 1, the torque path begins at the input sun gear 2 and ends at the output shaft 5.

The advantages of the multiple gear 4 are in particular that this performs the gear assembly 1 vibration damping and noise damping, so that in particular structure-borne noise is reduced. Furthermore, torsional vibrations are reduced and the freedom from play is increased. LIST OF REFERENCE NUMBERS

1 gear arrangement

2 input sun gear

3 planet carrier

4 multiple gear

5 output shaft

6 first gear section

7 second gear section

8 ring gear

9 intermediate section

10 bolts

1 1 receiving opening

12 damping section

13 coupling opening

14a, b side bars

R rotation axis

H main axis

Claims

claims

1 . A multiple gear (4) for a gear assembly (1) having a first gear portion (6) and a second gear portion (7), said first and second gear portions (6, 7) being non-rotatably interconnected via an intermediate portion (9) the first and second gear portions (6,7) are made of a metallic material having a damping portion (12), the damping portion (12) being disposed between the first gear portion (6) and the intermediate portion (9), the damping portion (12) is formed as a damping ring, wherein the damping ring concentrically between the first gear portion (6) and the intermediate portion (9) is formed so that the material of the first gear portion (6) and material from which the intermediate portion is formed, through the damping ring separated from each other and / or spaced and / or insulated, characterized in that the Dämpfungsabschnit t (12) forms an inner interface with the intermediate section (9) and an outer interface with the first gear section (6), wherein the inner and / or the outer interfaces are each designed as an interface acting in the circumferential direction, wherein

the outer interface is formed by the first one

Gear portion (6) has an internal toothing and the damping portion (12) has a complementary thereto formed external toothing and

the inner interface is formed by the fact that the intermediate section (9) has an outer toothing and the damping section (12) has an inner toothing formed complementary thereto and in that the damping section (12) has side webs (14a, 14b) which laterally surround the outer toothing of the intermediate section (9).

2. multiple gear (4) according to claim 1, characterized in that the damping portion (12) is formed as a plastic part.

3. multiple gear (4) according to claim 1 or 2, characterized in that the intermediate portion (9) and the second Getrieberadabschnitt (7) are integrally formed.

4. multiple gear (4) according to any one of the preceding claims, characterized in that the multiple gear (4) is designed as a double gear and / or as a tandem gear.

5. gear arrangement (1), characterized by a multiple gear (4) according to one of the preceding claims.

6. gear arrangement (1) according to claim 5, characterized in that the gear arrangement (1) is designed as a planetary gear and that the

Multiple gear (4) is formed as a planetary gear in the planetary gear.

7. Gear arrangement (1) according to claim 5 or 6, characterized in that a torque path via the first gear portion (6), the damping portion (12), the intermediate portion (9) to the second Getrieberadabschnitt (7) or in the opposite direction.

8. gear arrangement (1) according to one of claims 5 to 7, characterized in that the gear arrangement (1) is designed as a reduction gear and / or reduction gear in an electric drive for a vehicle.

9. gear arrangement (1) according to one of claims 5 to 7, characterized in that the gear arrangement (1) is designed as a reduction gear and / or reduction gear in a starter unit for a vehicle.