DE102013222635A1 - transmission device - Google Patents

Abstract

The invention has for its object to simplify the integration of a transmission device in a surrounding construction with a low manufacturing cost. For this purpose, a gear device 1 with two gears 5a, b, wherein the gears 5a, b arranged rotatably about a common axis of rotation R and wherein the gears 5a, b axially frontally opposite each other are aligned on the common axis of rotation R, with two shaft receiving portions 6a, b wherein on each of the shaft receiving portions 6a, b of one of the gears 5a, b is arranged and wherein each of the shaft receiving portions 6a, b has an axial through hole 7a, b for receiving a shaft 9a, b, wherein the through holes 7a, b each have an outer shaft side W and an inner transmission side G have, and proposed with two sealing elements 11a, b, wherein the sealing elements 11, b, the axial passage openings 7a, b seal sealingly on the transmission side.

Description

The invention relates to a transmission device with two gears, wherein the gears rotatably disposed about a common axis of rotation and wherein the gears are axially frontally opposite each other aligned on the common axis of rotation, and with two shaft receiving portions, wherein on each of the shaft receiving portions of the gears is arranged and each of the shaft receiving portions has an axial through hole for receiving a shaft, the through holes each having an outer shaft side and an inner gear side.

Gearboxes are used to distribute, combine or relay torque in machines or vehicles. In many cases gears are used in transmissions in order to transmit, translate or reduce torques within the transmission. The gears are usually located on shafts to forward or derive the respective torques.

A common example of a transmission is a spur gear differential, as in the document DE 10 2012 204 359 A1 which is probably the closest prior art. In this document, a spur gear differential for a motor vehicle is apparent, which is designed as a planetary gear. The spur gear differential has two sun gears, wherein the two sun gears can be coupled with output shafts. For this purpose, the sun gears each have a receiving section with a toothing running in the axial direction into which the output shafts can be inserted. The receiving sections have axially continuous openings for receiving the output shafts.

Field of the invention

The invention has for its object to simplify the integration of a transmission device in a surrounding construction with a low manufacturing cost.

This object is achieved by a transmission device having the features of claim 1. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the accompanying drawings.

In the context of the invention, a transmission device is proposed, which is particularly preferably suitable and / or designed for a vehicle. In particular, the transmission device is used for unification, separation, translation and / or reduction of a drive torque for the vehicle. The vehicle is in particular a motor vehicle, in particular a passenger car or a truck.

The transmission device includes (among others) two gears, the gears being rotatably disposed about a common axis of rotation. The gears can rotate at different angular velocities about the common axis of rotation. The gears are circumferentially toothed, the teeth are particularly preferably arranged on a circumferential, hollow cylindrical surface of the gears. The gears are arranged axially opposite each other end face. In particular, the gears are positioned parallel to one another and coaxially with the common axis of rotation. Particularly preferably, the gears are arranged directly adjacent to each other.

The transmission device has two shaft receiving portions, wherein on each of the shaft receiving portions of the gears is arranged. It is possible that at least one or both gears are rotatably mounted on the shaft receiving portion and the shaft receiving portions. However, it is preferred that the gears are rotatably positioned on the shaft receiving portions. In terms of manufacturing technology, it is even preferable for one of the gearwheels and one of the two shaft receiving sections to be formed as one-piece component. This one-piece component can be produced, for example, by forming technology.

Each of the shaft receiving portions has an axial passage opening for receiving a shaft and optionally in addition to the rotationally fixed coupling of the shaft receiving portion with the shaft. For the purpose of definition, it is established that the passage openings each have an outer shaft side and an inner transmission side. The transmission sides of the passage openings of the two shaft sections are thus arranged adjacent to one another or facing one another, the shaft sides of the passage openings enclose the transmission sides in the manner of a clip.

In the context of the invention it is proposed that the transmission device has two sealing elements, wherein the sealing elements are formed and / or arranged to seal the axial passage openings on the transmission side sealing. In particular, the sealing elements seal the axial passage openings lubricant-tight.

It is a consideration of the invention that the through-openings described are often production-related and only to avoid consuming. This raises the problem that on the one hand the waves, which are introduced into the shaft receiving portions, impurities in the shaft receiving portions and thus in the direction of the gears can bring in and on the other hand impurities from the range of gears escape via the shaft receiving portions in the direction of the waves. Through the use of the two sealing elements, it is achieved that the shaft receiving sections can still be produced in a simple manner with the axial through-opening in terms of manufacturing technology and, at the same time, a seal is made from the region of the shafts to the region of the toothed wheels. Since it is no longer necessary to pay attention to impurities that can propagate from the side of the shaft in the direction of the gears or in the opposite direction, the integration of the transmission device into the surrounding structure is significantly simplified.

In a preferred embodiment of the invention, the transmission device has a transmission interior, which is provided with a transmission oil. For example, the transmission oil may be present in the transmission interior as part of an oil sump lubrication or oil mist lubrication or other oil lubrication. The transmission interior thus forms a transmission oil chamber. Particularly preferably, at least the toothings of the gears are arranged in the transmission interior, since they should be lubricated to reduce friction with the transmission oil. Further, the transmission device has a shaft receiving space formed by the shaft receiving portions. The shaft receiving space is in particular at least two parts, since two shaft receiving portions are provided. The transmission interior is sealed by the sealing elements with respect to the shaft receiving space in particular gear oilproof. Particularly preferably, the shaft receiving space is formed by gear oil-dry or gear oil-free. It is also possible that different lubricants are used in the transmission interior and in the shaft receiving space. Thus, it is preferably provided that the transmission oil is used in the transmission interior, in the shaft receiving space, however, a grease, in particular a pasty grease, is used. In this embodiment, the advantage of the invention is particularly strong in the foreground, as ensured by the sealing elements that during installation, removal or reconstruction of the waves in the shaft sections no gear oil escape from the transmission interior and can lead to contamination outside of the transmission interior.

In a preferred embodiment of the invention, an intermediate ring is arranged in a space between the gears and / or the shaft sections. In particular, the intermediate ring is in contact with both gears or shaft sections and / or is in contact with these. In the embodiment as a one-piece component of the intermediate ring is applied to the one-piece component. The intermediate ring is arranged coaxially with the common axis of rotation. At least one of the sealing elements, preferably both sealing elements, form a centering surface for the intermediate ring. The centering surface is thus optionally formed jointly by one of the sealing elements or by both sealing elements. The centering surface is formed in particular cylinder jacket-shaped. The intermediate ring has a radially inwardly directed Gegenzentrierfläche. Particularly preferably, the centering surface and the Gegenzentrierfläche are both cylinder jacket-shaped and in particular in cross-section perpendicular to the axis of rotation circular. In this preferred embodiment, the one or more sealing elements thus assumes a dual function, wherein these seal on the one hand the transmission side of the through holes and on the other center the intermediate ring with the centering surface and optionally complementarily lead.

The intermediate ring may be formed as a bearing, in particular as a roller bearing, or as a plain bearing. Alternatively, the intermediate ring is realized as a spacer ring. In these embodiments, the intermediate ring ensures a minimum distance between the gears.

It is preferred that the axially mutually facing end faces of the toothed wheels or shaft sections are formed flat in the radial intermediate region between the centering surface and the intermediate ring. Compared to the conventional centering of intermediate rings, as described for example in the aforementioned prior art, can be dispensed with an additional stage in the gears or shaft sections for centering the intermediate ring. Thereby, the gears, the Wellenabschnite or possibly the one-piece components each comprising one of the gears and one of the shaft receiving portions are made particularly simple and therefore cost.

In a preferred structural embodiment, at least one of the sealing elements, preferably both sealing elements in each case, is designed as a sealing cap with an axially aligned annular section and at least one cover section connected to the annular section. The cover portion forms, together with the ring portion, a sealing contour which sealingly closes the transmission side of the passage opening. The ring portion is particularly preferably formed as a continuous circumferential pipe section or nozzle section, on the radial outer side particularly preferably the centering or a portion of the centering surface is formed. Of the Ring section may alternatively or optionally complementarily also form a circumferential sealing surface with the passage opening.

In possible structural embodiments of the invention, the sealing cap is formed of metal. In this case, this can be produced inexpensively, for example, by a forming process. However, it is also possible and particularly preferred that the sealing cap is made of plastic. Thus, the sealing cap is a very cost-effective mass-produced, so that the implementation of the transmission device manufacturing technology can be easily and therefore realized cost.

In a first possible embodiment of the invention, both sealing elements are designed as sealing caps, wherein the annular portions of the sealing caps facing each other. Thus, the lid portions of the sealing caps are recessed particularly deep in the through holes, so that the mechanical attachment of the sealing caps in the through holes is particularly resilient.

In an alternative embodiment of the invention, both sealing elements are also formed as sealing caps, but the lid portions of the sealing caps facing each other. In this embodiment, it is advantageous that the centering surface are supported by the lid portion, so that they form a higher stability for the intermediate ring.

In a further embodiment, it is also possible that on one side of the sealing cap, the lid portion is arranged and on the other axial side of the sealing cap, a circumferential support web or another cover portion is realized in order to increase the mechanical stability. Also in this structural embodiment, it is possible that the lid portions facing each other or facing away from each other.

In a particularly preferred embodiment of the invention, the transmission device is designed as a differential device for a vehicle. Particularly preferably, the gears form together with the shaft receiving portions, the outputs from the differential device. Particularly preferably, not only the sun gears are realized as gears, but also the other components as gears, in particular spur gears realized. In particular, the differential device is designed as a planetary gear. In this embodiment, the transmission device comprises a planet carrier, on which two sets of planetary gears are arranged, wherein in each case a set of planetary gears meshes with one of the gears and the planet gears mesh with each other in pairs. Such planetary gear, designed as differential devices, are known for example from the document mentioned above.

In a preferred embodiment of the invention, the intermediate ring is formed as a friction ring, which applies a friction torque between the gears and / or determines the locking value of the differential device.

Further features, advantages and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the accompanying figures. Showing:

1 a transmission device in a schematic longitudinal section as a first embodiment of the invention;

2 an enlarged detail in the area of the sun gears of the transmission device in the 1 ;

3 the same detail as in the 2 but in a modified embodiment;

4 in the same representation as the 2 and 3 another alternative;

5a , b is a schematic three-dimensional representation of sealing caps in the transmission device in the 1 or in the 2 - 4 ,

The 1 shows a schematic longitudinal section of a transmission device 1 , which is suitable and / or designed for a vehicle. The transmission device 1 is designed as a differential, in particular as a transverse differential. The transmission device 1 distributed in the drive train of the vehicle, the drive torque from an input E of the transmission device 1 on two outputs A of the transmission device 1 ,

The transmission device 1 is designed as a planetary gear and has a planet carrier 2 on which a circumferential toothing 3 carries, wherein the planet carrier 2 the input E in the transmission device 1 forms. On the planet carrier 2 are two sets of planet wheels 3a , b rotatably mounted. The planet wheels 3a , b each comb with a sun gear 4a , b, where the planetary gears 3a with the sun wheel 4a and the planet wheels 3b with the sun wheel 4b comb. In addition, each comb one of the planetary gears 3a with one of the planet wheels 3b so the planetary gears 3a Combine b in pairs.

The sun wheels 4a , b each have a gear 5a , B and a shaft receiving section 6a , b on. gear 5a and shaft receiving section 6a are as a one-piece component as the sun gear 4a educated. In the same way is the gear 5b and the shaft receiving section 6b as a common component in the form of the sun gear 4b educated. The gears 5a , b are circumferentially interlocked on the radial outside. The shaft receiving sections 6a , b or inserted therein output shafts 9a , b form the outputs from the transmission device 1 , The shaft receiving sections 6a , B are formed like a hollow cylinder and have an axially to a common axis of rotation R axially extending passage opening 7a , b on. Radially inside are the shaft receiving sections 6a , B each provided with a toothing, wherein the teeth of the toothing extend in the axial direction. The toothing is designed such that the output shafts 9a , b as plug-in waves in the through hole 7a , b and rotatably in the shaft receiving portions by the teeth in the circumferential direction 7a , b, however, are arranged axially displaceable.

The gears 5a , b and thus the sun gears 4a , B can rotate at different angular velocities or at the same angular velocities about the common axis of rotation R. They have axially aligned end faces, wherein the gears 5a , B axially frontally opposite each other are aligned. In particular, the gears are 6a , B arranged immediately adjacent to each other.

In the transmission device 1 is a transmission interior 8th formed, which is supplied with a transmission oil, not shown. The gear oil serves to friction losses between the gears 5a , b and the planet wheels 3a to decrease b.

Around the transmission interior 8th , which is thus designed as a transmission oil space to complete against the environment, are the output shafts 9a , b opposite a housing 15 , which is shown only in sections, via a storage facility 16a , b sealed.

Through the passage opening 7a , b becomes a two-piece wave receiving space 10a , b formed by means of sealing caps 11a , b trained sealing elements relative to the transmission interior 8th is sealed. At the passage openings 7a , B can be defined an outer shaft side W and an inner transmission side G. The exit openings of through-holes 7a , b on the transmission side G are greater in diameter than the free diameter of the teeth in the through holes 7a , b trained.

In the 2 is the area of the shaft receiving sections 6a , b with the sealing caps 11a , b shown enlarged. For one thing, it should be noted that the passage openings 7a , B manufacturing technology are easy to produce, since they are made starting from the shaft side W from a funnel-shaped section, then the teeth and on the transmission side G from the circular outlet opening.

The sealing caps 11a , b are in a schematic three-dimensional representation in the 5a It should be noted that these are designed as very simple components which comprise a cover section 12 have, which is flat in a simple manner and with a ring portion 13 is connected, which extends as a hollow cylinder portion or pipe section coaxial with the axis of rotation R. The sealing caps 11a , b may be made of metal, but particularly preferably and inexpensively made of plastic. The side of the ring section 13 is hereinafter referred to as the ring side, the side of the lid portion 12 referred to as cover page.

In the 2 it can be seen that the sealing caps 11a , b with its ring side to the outside and the cover side inwards into the receiving contour of the through holes 7a , b are tightly inserted. The ring sections 13 form circumferentially radially outside a cylinder jacket-shaped sealing surface, which together with a circumferential, hollow cylindrical sealing surface in the sun gears 4a , b or shaft receiving sections 6a , b or the passage openings 7a , b the passage openings 7a , b on the gearbox side to prevent the lubricant from passing out of the gearbox interior 8th in the wave reception room 10a , b secures.

In addition, the ring sections form 13 with its radial outer side a common centering Z, through which an intermediate ring 14 , which is arranged coaxially to the axis of rotation R and which is axially on both sides of the sun gears 4a , b, in particular on the gears 5a , b is supported, centered. For this purpose, the intermediate ring 14 a radially inner Gegenzentrierfläche GZ. The axially aligned end faces of the sun gears 4a , b or the gears 5a , b are in the area between the centering surface Z and the radial extent of the intermediate ring 14 plan or aligned in a radial plane to the axis of rotation R, so that these manufacturing technology can be made very easily. The sealing caps 11a , b thus take over the function, the transmission interior 8th against the wave reception room 10a , B and second seal a centering Z for the intermediate ring 14 provide.

The intermediate ring 14 is designed as a friction ring, which by the introduced friction torque on the sun gears 4a , b for a locking value in the transmission device designed as a differential gear 1 provides.

Due to the installation position shown with the inwardly facing lid sections 13 is the centering Z through the lid sections 13 mechanically very stiff supported.

In the 3 is shown a further embodiment of the invention, wherein the sealing caps 11a , B are now mounted so that the ring sides facing each other and the lid sides are facing away from each other. Thus, the free ends of the ring sections 13 facing each other and together with their radial outer side form the centering surface Z. This embodiment has the advantage that the seals through the continuous cover sections 13 are formed mechanically very stable and also the seat of the sealing caps 11a , b in the through holes 7a , b is improved.

In the 4 is shown a further embodiment of the invention, wherein the sealing caps 11a , b in the axial direction are chosen so wide that it forms a form-fitting manner on a shoulder S, which also forms the beginning of the toothing for the plug-in shafts. In this embodiment, the sealing caps 11a , b particularly easy to assemble, as these are up to the stop in the passage opening 7a , b can be pressed, so that always sufficient supernatant on the ring side of the sealing caps 11a , B is available to provide the centering Z available.

LIST OF REFERENCE NUMBERS

1

 transmission device

2

 planet carrier

3

 gearing

3a, b

 planetary gears

4a, b

 sun gears

5a, b

 gears

6a, b

 Wave receiving portions

7a, b

 Through openings

8th

 Transmission interior space

9a, b

 output shafts

10a, b

 Shaft receiving space

11a, b

 sealing caps

12

 cover section

13

 ring section

14

 intermediate ring

15

 casing

16 a, b

 Storage facility

A

 outputs

e

 entrance

G

 transmission side

GZ

 Gegenzentrierfläche

R

 axis of rotation

S

 shoulder

W

 shaft side

Z

 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 102012204359 A1 [0003]

Claims (10)

Transmission device ( 1 ) with two gears ( 5a , b), the gears ( 5a , b) arranged rotatably about a common axis of rotation (R) and wherein the gears ( 5a , b) are aligned axially opposite one another on the common axis of rotation (R), with two shaft receiving sections ( 6a , b), wherein on each of the shaft receiving sections ( 6a , b) one of the gears ( 5a , b) is arranged and wherein each of the shaft receiving sections ( 6a , b) an axial passage opening ( 7a , b) for receiving a wave ( 9a , b), wherein the passage openings ( 7a , b) each having an outer shaft side (W) and an inner transmission side (G), characterized by two sealing elements ( 11a , b), wherein the sealing elements ( 11 , b) the axial passage openings ( 7a , b) sealingly seal on the transmission side (g). Transmission device ( 1 ) according to claim 1, characterized by a transmission interior ( 8th ) with a transmission oil so that it forms a transmission oil space, and a shaft receiving space ( 10a , b) through the shaft receiving sections ( 6a , b), wherein the transmission interior ( 8th ) through which the sealing elements ( 11a , b) opposite the wave receiving space ( 10a , b) is sealed. Transmission device ( 1 ) according to claim 1 or 2, characterized in that between the gears ( 5a , b) and / or the shaft sections ( 6a , b) an intermediate ring ( 14 ), wherein at least one of the sealing elements ( 11a , b) or both sealing elements ( 11a , b) together a centering surface (Z) for the intermediate ring ( 14 ) form. Transmission device ( 1 ) according to one of the preceding claims, characterized in that at least one of the sealing elements ( 11a , b) as a sealing cap with an axially aligned annular portion ( 13 ) and at least one cover portion connected to the ring portion (US Pat. 12 ) is trained. Transmission device ( 1 ) according to claim 4, characterized in that the ring section ( 13 ) of the sealing cap ( 11a , b) the centering surface (Z) forms or at least forms. Transmission device ( 1 ) according to claim 4 or 5, characterized in that the sealing cap ( 11a , b) is formed of metal or plastic. Transmission device ( 1 ) according to one of claims 4 to 6, characterized in that both sealing elements ( 11a , b) as sealing caps ( 11a , b) are formed, wherein the ring sections ( 13 ) of the sealing caps ( 11a , b) face each other. Transmission device ( 1 ) according to one of claims 4 to 6, characterized in that both sealing elements ( 11a , b) as sealing caps ( 11a , b) are formed, wherein the cover sections ( 13 ) of the sealing caps ( 11a , b) face each other. Transmission device ( 1 ) according to one of the preceding claims, characterized in that the transmission device ( 1 ) is formed as a differential device for a vehicle. Transmission device ( 1 ) according to claim 9, characterized in that the intermediate ring ( 14 ) is designed as a friction ring.

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