GB2463902A - Ring gear having notch and nose connection with differential carrier - Google Patents
Ring gear having notch and nose connection with differential carrier Download PDFInfo
- Publication number
- GB2463902A GB2463902A GB0817758A GB0817758A GB2463902A GB 2463902 A GB2463902 A GB 2463902A GB 0817758 A GB0817758 A GB 0817758A GB 0817758 A GB0817758 A GB 0817758A GB 2463902 A GB2463902 A GB 2463902A
- Authority
- GB
- United Kingdom
- Prior art keywords
- differential
- carrier
- ring gear
- notch
- nose
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 210000001331 nose Anatomy 0.000 claims abstract description 60
- 238000005242 forging Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000003801 milling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/16—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of differential gearing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/38—Constructional details
- F16H2048/385—Constructional details of the ring or crown gear
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H48/00—Differential gearings
- F16H48/06—Differential gearings with gears having orbital motion
- F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Retarders (AREA)
- General Details Of Gearings (AREA)
Abstract
A ring gear 10 comprises a central opening (18, fig 1) for receiving a differential carrier 24 and having an inner surface 16. The central opening (18) comprises at least one notch 20 and/or nose 22 which extends in a radial direction and inserts into a corresponding nose 22 and/or notch 20 of the differential carrier 24, thereby transferring torque from the ring gear 10 to the differential carrier 24. Screws 48 are screwed into an internal thread of a ring body 14 of the ring gear 10 so that a first carrier part 44 and a second carrier part 46 of the differential carrier 24 are connected to each other at their flanges 30. By connecting the ring gear 10 and differential carrier 24 with notches 20 and/or noses 22 the number of screws may be low which leads to simplified and faster assembling times and lower manufacturing costs. Forging may be used to manufacture the ring gear 10 and/or the differential carrier 24. Bearings 50 rotatably support the differential carrier 24 at an area of axle guiding 36.
Description
S Ring gear and differential carrier Descript ion The invention relates to a ring gear for a final drive of a differential gear box assembly as well as to a differential carrier for a differential of a differential gear box assembly. By means of the ring gear and the differential carrier a torque can be transferred between the final drive and the differential.
A differential gear box assembly is known wherein the ring gear of the final drive is fastened to a flange of the differential carrier by means of twelve screw connections. The torque flow between the ring gear and the differential carrier is divided to the twelve screw connection so that even high torques may be securely transferred.
It is a disadvantage of such kind of a differential gear box assembly that connecting the ring gear to the differential carrier takes a long time during assembling.
Particularly the screws have to fasten in a specific sequence ensuring a parallel arrangement of the ring gear to the flange for avoiding unnecessary shear forces to the screws.
It is the object of the invention to provide a ring gear for a final drive of a differential gear box assembly as well as to a differential carrier for a differential of a differential gear box assembly, by means of which an assembling is simplified.
The solution of the object is achieved by ring gear comprising the features of claim 1 as well as a differential carrier comprising the features of claim 6.
Preferred embodiments are given by the dependent claims.
The ring gear according to the invention is adapted for a final drive of a differential gear box assembly.
The ring gear comprises a central opening for receiving a part of a differential, particularly a differential carrier. According to the invention the central opening comprises at least one notch and/or nose in radial direction for inserting a corresponding nose and/or notch of the differential for torque transfer.
Due to the specific design of the central opening with notches and/or noses the ring gear may provide a positive-fit connection with a correspondingly shaped differential or a specific part of the differential like the differential carrier. Due to the nose inserted into the corresponding notch, a torque transfer between the notch and the nose is possible. Shear forces are mainly prevented. It is used the insight that mainly torque forces in circumferential direction and only negligible forces in axial direction occur between the ring gear of the final drive and the differential. Thus, mainly the whole torque may be transferred via the nose/notch-connection so that less screw connections, if so at all, may be provided. This leads to a simplified and faster assembling of the ring gear to the differential and less manufacturing costs. Due to the nose, which has to be inserted into its corresponding notch first during assembling, the ring gear and the differential are automatically accurately aligned with respect to each other so that the holes, provided in the ring gear and the differential, for receiving a screw are automatically arranged coaxial to each other. It is not necessary to find the correct angle in circumferential direction for screwing the ring gear to the differential. This further facilitates and speeds up the assembling. Particularly the ring gear may consist of a single ring body which comprises the specific designed central opening on a radial inner surface and a further torque transfer connection on a radial outer surface.
Preferably several notches and/or noses are provided, wherein neighboring notches and/or noses are spaced to each other by mainly the same angle in circumferential direction. The notches and/or noses may be evenly distributed at mainly the same diameter. Due to this arrangement of the notches and/or noses the ring gear may be attached on the differential at different angle positions in circumferential direction.
Most preferred the ring gear is mainly formed by forging. Due to the cost efficient forging it is not necessary to apply a milling to the ring gear. Further the design of the notch and/or the nose may be provided during the forging process. Particularly the design of the notch and/or the nose may be taken into account at a subsequent heat treatment. Due to the forging different shapes of the notch and/or the nose is possible. The notch and/or the nose may be provided for instance like a spline, like a puzzle piece or like a tooth of a cogwheel.
Particularly the ring gear may comprise only notches, only noses or notches and noses at the same time. Preferably the central opening comprises a nominal diameter, wherein at least one notch protrudes radially outwards with respect to the nominal diameter and at least one nose protrudes radially inwards with respect to the nominal diameter, wherein particularly several notches and several noses are arranged in an alternating manner.
Particularly at least one fastening means, particularly a screw opening with an internal thread and/or a through hole, is provided for fixing the differential with the ring gear in axial direction. One or a few more screws are sufficient to provide a fixation in axial direction. The thickness of the ring gear in axial direction is sufficient to fasten a screw by means of an internal thread. A nut for fastening the corresponding screw is not necessary reducing the risk that a nut may fall into the gear box during assembling.
Further only one hand is sufficient to fasten the screw.
The invention further relates to a differential carrier which is adapted for a differential of a differential gear box assembly. The differential carrier comprises a carrier body for being received by a final drive, particularly a ring gear of the final drive.
According to the invention the carrier body comprises at least one nose and/or notch in radial direction for inserting a corresponding notch and/or nose of the final drive for torque transfer.
Due to the specific design of the carrier body with notches and/or noses the differential carrier may provide a positive-fit connection with a correspondingly shaped final drive or a specific part of the final drive like the ring gear. This leads to a simplified and faster assembling of the ring gear to the differential and less manufacturing costs. The differential carrier may comprise the same corresponding advantages as described above with respect to the ring gear. Further the carrier body may be further designed as mentioned above with respect to the ring gear.
Preferably the carrier body comprises several noses and/or notches, wherein neighboring noses and/or notches are spaced to each other by mainly the same angle in circumferential direction for attaching the final drive at different angle positions to the differential carrier.
ost preferred the differential carrier is mainly formed by forging. A milling is not necessary.
Particularly the carrier body may comprise only notches, only noses or notches and noses at the same time. Preferably the carrier body comprises a nominal diameter, wherein at least one nose protrudes radially outwards with respect to the nominal diameter and at least one notch protrudes radially inwards with respect to the nominal diameter, wherein particularly several noses and several notches are arranged in an alternating manner.
Particularly at least one fastening means, particularly a through hole and/or a screw opening with an internal thread, is provided for fixing the final drive with the differential carrier in axial direction.
For instance a screw may be led through the carrier body and fastened with the internal thread of the ring gear or another part of the final drive.
The invention further relates to a differential gear box assembly for a motor vehicle comprising a ring gear and a differential carrier. The ring gear and/or the differential carrier may be designed as previously described. The ring gear is connected to the differential carrier for torque transfer via at least one nose inserted into at least one notch. Due to the specific design of connection by means of noses inserted into corresponding notches the ring gear may be positive-fit connected with a correspondingly shaped differential carrier. This leads to a simplified and faster assembling of the differential gear box assembly and less manufacturing costs. The differential gear box assembly may comprise the same corresponding advantages as described above with respect to the ring gear and/or the differential carrier.
Particularly the differential carrier comprises an inner volume for receiving a differential drive, wherein the differential carrier is split into at least a first carrier part and a second carrier part. Due to the split design of the differential carrier the inner volume is accessible for providing parts of the differential drive.
The first carrier part and the second carrier part may be detachably connected to each other, for instance by means of at least one screw connection.
Preferably the first carrier part as well as the second carrier part are connected to the ring gear via at least one nose inserted into at least one notch. Thus the ring gear may apply a torque to the first carrier part as well as the second carrier part at the same time. This leads to an improved torque flow. For instance the first carrier part as well as the second carrier part comprise each a nose, wherein both noses are arranged into the same notch. For that purpose the nose of the one carrier part may overhang the nose of the other carrier part so that both noses may take up the forces of the ring gear in the corresponding notch. In addition or in the alternate the first carrier part and the second carrier part each comprise a notch into which one nose of the ring gear is inserted for providing torque transfer to the first carrier part and the second carrier part at the same time.
Particularly the first carrier part is fixed in axial direction by clamping the first carrier part between the ring gear and the second carrier part. Since the axial forces are low with respect the forces in circumferential direction it is sufficient to hold the first carrier part in position by clamping. It is sufficient to fasten the second carrier part to the ring gear, when the first carrier part is at least partially arranged between the ring gear and the second carrier part.
Preferably the differential carrier is connected to the ring gear for axial fixation by a number n of screw connections, wherein the number n is 1 �= n �= 10, particularly 2 �= n �= 8 and preferably 4 �= n �= 6. This leads to a low number of screw connections and a low number of screws, which have to fastened during assembling, leading to a fast assembling and lower manufacturing costs.
These and other aspects of the invention will be apparent from and elucidated with reference to a preferred embodiment described hereinafter.
In the drawings: Fig. 1 is a schematic simplified top view of ring gear according to the invention in connection with a differential carrier according to the invention, Fig. 2 is a schematic top view of a differential gear box assembly as illustrated in Fig. 1 in direction of arrows II in Fig. 3 and Fig. 3 is a schematic sectional view of the differential gear box assembly as illustrated in Fig. 2.
The ring gear 10 as illustrated in Fig. 1 comprises a ring body 12 with a radial outer surface 14 and a radial inner surface 16. By means of the inner surface 16, which is closed in circumferential direction, a central opening 18 is defined. In the illustrated embodiment the central opening 18 comprises six notches 20, which are evenly distributed in circumferential direction on the same diameter. By means of the inner parts of the central opening 18 a nominal diameter of the ring gear 10 is defined.
Into the notches 20 correspondingly shaped noses 22 of a differential carrier 24 are inserted, wherein the noses protrude in radial direction from a carrier body 26. Due to the noses 22 inserted into the notches 20 a torque transfer in circumferential direction between the ring gear 10 and the differential carrier 24 is provided.
In the illustrated embodiment the ring body 12 comprises six screw openings 28 with an internal thread for fastening the ring gear 10 to the differential carrier 24 via a flange 30 of the differential carrier 24.
In assembled state as illustrated in Fig. 2 a sun wheel 32 of a differential drive 34 is provided coaxial with respect to the ring gear 10 and the differential carrier 24. The sun wheel 32 is accessible for a not illustrated axle via an axle guiding 36.
The differential gear box assembly 38 as illustrated in Fig. 3 comprises a final drive, from which only the ring gear 10 is illustrated. The differential gear box assembly further comprises a differential 40, which comprises the differential carrier 24 as well as the differential drive 34, which is located inside an inner volume 42 provided by the differential carrier 24.The ring gear 10 and the differential carrier 24 are connected to each other for transferring torque by means of noses 22 inserted into corresponding notches 20. In the illustrated embodiment the nose 22 is provided as a step-like protrusion at the transition from the nominal diameter of the differential body 26 to its flange 30, which could be easily provided by forging.
In the illustrated embodiment the differential carrier comprises a first carrier part 44 and a second carrier part 46 so that the differential carrier 24 may be split for assembling the differential drive 34. The first carrier part 44 and the second carrier part 46 are connected to each other at the area of their flanges 30 by means of screws 48, which are screwed with an internal thread of the ring body 14 of the ring gear 10. The differential carrier 24 is rotatably supported at the area of the axle guidings 36 by means of bearings 50.
Referencesigns 10 ring gear 12 ring body 14 outer surface 16 inner surface 18 central opening 20 notch 22 nose 24 differential carrier 26 carrier body 28 screw opening 30 flange 32 sun wheel 34 differential drive 36 axle guiding 38 differential gear box assembly 40 differential 42 inner volume 44 first carrier part 46 second carrier part 48 screw 50 bearing
Claims (15)
- Claims 1. Ring gear for a final drive of a differential gear box assembly (38), comprising a central opening (18) for receiving a part of a differential (40), particularly a differential carrier (24), characterized in that the central opening (18) comprises at least one notch (20) and/or nose (22) in radial direction for inserting a corresponding nose (22) and/or notch (20) of the differential (40) for torque transfer.
- 2. Ring gear according to claim 1 whereby several notches (20) and/or noses (22) are provided, wherein neighboring notches (20) and/or noses (22) are spaced to each other by mainly the same angle in circumferential direction.
- 3. Ring gear according to claim 1 or 2 whereby the ring gear (10) is mainly formed by forging.
- 4. Ring gear according to anyone of claims 1 to 3 whereby the central opening (18) comprises a nominal diameter, wherein at least one notch (20) protrudes radially outwards with respect to the nominal diameter and at least one nose (22) protrudes radially inwards with respect to the nominal diameter, wherein particularly several notches (20) and several noses (22) are arranged in an alternating manner.
- 5. Ring gear according to anyone of claims 1 to 4 whereby at least one fastening means, particularly a screw opening (28) with an internal thread and/or a through hole, is provided for fixing the differential (40) with the ring gear (10) in axial direction.
- 6. Differential carrier for a differential (40) of a differential gear box assembly (10), comprising a carrier body (26) for being received by a final drive, particularly a ring gear (10) of the final drive, characterized in that the carrier body (26) comprises at least one nose (22) and/or notch (20) in radial direction for inserting a corresponding notch (20) and/or nose (22) of the final drive for torque transfer.
- 7. Differential carrier according to claim 6 whereby several noses (22) and/or notches (20) are provided, wherein neighboring noses (22) and/or notches (20) are spaced to each other by mainly the same angle in circumferential direction.
- 8. Differential carrier according to claim 6 or 7 whereby the differential carrier (24) is mainly formed by forging.
- 9. Differential carrier according to anyone of claims 6 to 8 whereby the carrier body (26) comprises a nominal diameter, wherein at least one nose (22) protrudes radially outwards with respect to the nominal diameter and at least one notch (20) protrudes radially inwards with respect to the nominal diameter, wherein particularly several noses (22) and several notches (20) are arranged in an alternating manner.
- 10. Differential carrier according to anyone of claims 6 to 9 whereby at least one fastening means, particularly a through hole and/or a screw opening with an internal thread, is provided for fixing the final drive with the differential carrier (24) in axial direction.
- 11. Differential gear box assembly for a motor vehicle comprising a ring gear (10) according to anyone of claims 1 to 5 and a differential carrier (24) according to anyone of claims 6 to 10, whereby the ring gear (10) is connected to the differential carrier (24) for torque transfer via at least one nose (22) inserted into at least one notch (20)
- 12. Differential gear box assembly according to claim 11 whereby the differential carrier (24) comprises an inner volume (42) for receiving a differential drive (34), wherein the differential carrier (24) is split into at least a first carrier part (44) and a second carrier part (46).
- 13. Differential gear box assembly according to claim 12 whereby the first carrier part (44) as well as the second carrier part (46) are connected to the ring gear (10) via at least one nose (22) inserted into at least one notch (20).
- 14. Differential gear box assembly according to claim 12 or 13 whereby the first carrier part (44) is fixed in axial direction by clamping the first carrier part (44) between the ring gear (10) and the second carrier part (46)
- 15. Differential gear box assembly according to anyone of claims 11 or 14 whereby the differential carrier (24) is connected to the ring gear (10) for axial fixation by a number n of screw connections, wherein the number n is 1 �= n �= 10, particularly 2 �= ri �= 8 and preferably 4 �= n �= 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0817758A GB2463902A (en) | 2008-09-27 | 2008-09-27 | Ring gear having notch and nose connection with differential carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0817758A GB2463902A (en) | 2008-09-27 | 2008-09-27 | Ring gear having notch and nose connection with differential carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0817758D0 GB0817758D0 (en) | 2008-11-05 |
| GB2463902A true GB2463902A (en) | 2010-03-31 |
Family
ID=40019694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0817758A Withdrawn GB2463902A (en) | 2008-09-27 | 2008-09-27 | Ring gear having notch and nose connection with differential carrier |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2463902A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047389A (en) * | 2013-01-25 | 2013-04-17 | 优必胜(福建)机械工业有限公司 | Improved differential mechanism device |
| US11946531B2 (en) | 2019-12-02 | 2024-04-02 | American Axle & Manufacturing, Inc. | Electric drive module with transmission having parallel twin gear pairs sharing load to a final drive gear |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2069411A (en) * | 1933-12-02 | 1937-02-02 | Timken Axle Co Detroit | Gear mounting for axle drives and the like |
| FR2580349A1 (en) * | 1985-04-16 | 1986-10-17 | Renault | Mechanical component with two integral elements |
| US5320587A (en) * | 1993-02-17 | 1994-06-14 | General Motors Corporation | Differential case with ring gear attachment |
| DE10030901A1 (en) * | 2000-06-23 | 2002-01-03 | Zahnradfabrik Friedrichshafen | Differential for driving axle of vehicle has crown wheel with synchronizing gearing acting as cutting gearing and pressed into counter-piece on differential cage |
-
2008
- 2008-09-27 GB GB0817758A patent/GB2463902A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2069411A (en) * | 1933-12-02 | 1937-02-02 | Timken Axle Co Detroit | Gear mounting for axle drives and the like |
| FR2580349A1 (en) * | 1985-04-16 | 1986-10-17 | Renault | Mechanical component with two integral elements |
| US5320587A (en) * | 1993-02-17 | 1994-06-14 | General Motors Corporation | Differential case with ring gear attachment |
| DE10030901A1 (en) * | 2000-06-23 | 2002-01-03 | Zahnradfabrik Friedrichshafen | Differential for driving axle of vehicle has crown wheel with synchronizing gearing acting as cutting gearing and pressed into counter-piece on differential cage |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047389A (en) * | 2013-01-25 | 2013-04-17 | 优必胜(福建)机械工业有限公司 | Improved differential mechanism device |
| CN103047389B (en) * | 2013-01-25 | 2015-06-10 | 优必胜(福建)机械工业有限公司 | Improved differential mechanism device |
| US11946531B2 (en) | 2019-12-02 | 2024-04-02 | American Axle & Manufacturing, Inc. | Electric drive module with transmission having parallel twin gear pairs sharing load to a final drive gear |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0817758D0 (en) | 2008-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S30Z | Assignments for licence or security reasons |
Free format text: APPLICANT GM GLOBAL TECHNOLOGY OPERATIONS, INC SECURITY TO THE UNITED STATES DEPARTMENT OF THE TREASURY |
|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |