WO2023035232A1 - Différentiel - Google Patents

Différentiel Download PDF

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Publication number
WO2023035232A1
WO2023035232A1 PCT/CN2021/117728 CN2021117728W WO2023035232A1 WO 2023035232 A1 WO2023035232 A1 WO 2023035232A1 CN 2021117728 W CN2021117728 W CN 2021117728W WO 2023035232 A1 WO2023035232 A1 WO 2023035232A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
differential
planetary
input gear
housing
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.)
Ceased
Application number
PCT/CN2021/117728
Other languages
English (en)
Chinese (zh)
Inventor
俞正才
张仁
余磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to PCT/CN2021/117728 priority Critical patent/WO2023035232A1/fr
Priority to CN202180100774.XA priority patent/CN117677519A/zh
Publication of WO2023035232A1 publication Critical patent/WO2023035232A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present application relates to the field of wheel differentials of vehicles, in particular to a differential.
  • the differential is usually used in the transmission mechanism of the vehicle to transmit the torque from the transmission of the vehicle to the wheels and enable different wheels to rotate at different rotational speeds when the vehicle is turning.
  • FIG. 1 shows a schematic cross-sectional view of a differential.
  • the differential includes a housing 10 , planetary shafts 20 , pins 30 , planetary gears 40 , output gears 50 , input gears 60 , bearings 70 and bolts 80 .
  • the housing 10 is a rotating body with a central axis, the cross-sectional shape of the rotating body at any position is substantially circular, and the housing 10 as a whole can rotate around the central axis.
  • An installation space S is formed inside the housing 10, and the gear transmission mechanism composed of the planetary gear 40 and the output gear 50 is accommodated in the installation space S.
  • Two planetary gears 40 and two output gears 50 constitute a gear transmission mechanism.
  • the output gear 50 is connected to the half shaft passing through the through hole extending along the axial direction A of the housing 10 .
  • Each planetary gear 40 meshes with two output gears 50 .
  • the two planetary gears 40 are mounted on the same planetary shaft 20 fixed to the housing 10 , so that the two planetary gears 40 can rotate around the planetary shaft 20 while rotating with the housing 10 as a whole.
  • the planetary shaft 20 is fixed to the housing 10 by a pin 30 passing through one end portion of the planetary shaft 20 in the longitudinal direction.
  • the input gear 60 is mounted and fixed to the casing 10 via a large number (for example, 10 or more) of bolts 80 .
  • the input gear 60 is capable of transmitting torque from the outside of the differential, such as the output shaft of the transmission, to the housing 10 via bolts.
  • the inner rings of the bearing 70 are fixedly mounted on both axial ends of the housing 10 in an interference fit manner. In this way, when the outer ring of the bearing 70 is supported by, for example, the case of the transmission, the bearing 70 can well support the case 10 so that the case 10 can rotate stably.
  • the torque from the outside will be sequentially transmitted to the axle shaft of the vehicle via the input gear 60 , the housing 10 , the planetary shaft 20 , the planetary gear 40 and the output gear 50 , and finally to the wheels of the vehicle.
  • the differential having the above structure has the following disadvantages. Since the torque from the outside will pass through the housing 10, the housing 10 needs to bear a considerable load, so the housing 10 usually made of cast iron needs to have a large geometric size and heavy weight. In addition, since the bolt 80 cannot bear the shearing force, the transmission of torque between the input gear 60 and the housing 10 depends on the friction torque between the two, and the magnitude of this friction torque depends on the predetermined force of the bolt 80.
  • the present application is made based on the defects of the above-mentioned prior art.
  • the purpose of the invention of the present application is to provide a new type of differential, which can avoid the problem that the geometric size of the housing is too large and the weight is heavy because the torque transmission path needs to be transmitted from the input gear to the housing, and can Alleviate the cost and installation problems associated with the excessive number of bolts used to connect the input gear to the housing.
  • the present application may adopt the following technical solutions.
  • the application provides a differential as follows, including:
  • an input gear capable of receiving torque from outside the differential
  • a planetary shaft extending radially along one of said input gears, said planetary shaft being in direct drive coupling with said input gear such that torque can be directly transmitted between said input gear and said planetary shaft;
  • An output gear which meshes with the planetary gears, is capable of transmitting torque to the outside of the differential.
  • installation parts are formed at both ends of the planetary gear shaft, installation grooves corresponding to the installation parts are formed on the input gear, and the installation parts are inserted into the corresponding installation grooves , so that the planetary shaft can rotate together with the input gear.
  • the profile of the installation groove is U-shaped, and the installation groove includes two planar side walls parallel to each other and an arc-shaped bottom wall connecting the two side walls.
  • the mounting portion includes a planar portion in contact with the two planar side walls, and the bottom wall restricts the axial movement of the planet wheel shaft.
  • the cross section of the installation part is formed in a square shape.
  • the differential further includes a casing, the casing is coaxially fixed with the input gear, an installation space is formed inside the casing, and the planetary gear and the output gear are accommodated and installed in the installation space, and the planet wheel shaft passes through the housing and is relatively fixed with the housing.
  • the housing includes a main body portion and a peripheral portion fixed to each other, the installation space is located inside the main body portion, and the peripheral portion protrudes radially outward from the main body portion ,
  • the planetary shaft extends through the installation space along the radial direction, and both end portions of the planetary shaft protrude to the outside of the main body portion.
  • the input gear is sleeved on the outside of the main body, and the input gear is fixed to the peripheral portion.
  • the differential further includes a plurality of bolts, the input gear and the peripheral portion abut in the axial direction of the input gear, and are connected to each other through the plurality of bolts. Together, the number of the plurality of bolts is no greater than six.
  • the main body part is formed with lightening holes.
  • both the planetary gear and the output gear are bevel gears.
  • the present application provides a novel differential gear, which comprises an input gear, a planetary shaft, a planetary gear and an output gear.
  • the input gear is capable of receiving torque from the outside.
  • the planetary gear shaft extends along a radial direction of the input gear, and the planetary gear shaft is directly connected with the input gear, so that torque can be directly transmitted between the input gear and the planetary gear shaft.
  • the planetary gears are installed on the planetary shaft and can rotate around the planetary shaft.
  • the output gear meshes with the planetary gear and can transmit torque to the outside.
  • FIG. 1 is a schematic sectional view showing a conventional differential.
  • Fig. 2A is a schematic structural diagram showing a differential according to an embodiment of the present application.
  • FIG. 2B is a schematic cross-sectional view showing the differential in FIG. 2A .
  • transmission coupling refers to a connection between two components capable of transmitting torque
  • direct transmission coupling refers to a connection between two components capable of directly transmitting torque without passing through other components.
  • axial refers to the axial, radial and circumferential directions of the input gear, respectively.
  • a differential according to an embodiment of the present application includes a housing 1, a planetary shaft 2, two planetary gears 3, two output gears 4, an input gear 5, two bearings 6 and four bolts7.
  • the housing 1 is a rotating body with a central axis, the cross-sectional shape of the rotating body at any axial position is substantially circular, and the housing 1 as a whole can rotate around the central axis.
  • the housing 1 includes a main body portion 11 and a peripheral edge portion 12 .
  • the radial dimension of the main body portion 11 gradually increases from one axial side (right side in FIG. 2B ) toward the other axial side (left side in FIG. 2B ) and then gradually decreases.
  • An installation space S is formed inside the main body part 11 , and the gear transmission mechanism composed of the planetary gear 3 and the output gear 4 is accommodated in the installation space S.
  • An installation hole for inserting the planet wheel shaft 2 is formed in the axial central part of the casing 1 , and the two installation holes extend along the same radial direction R and penetrate through the casing 1 .
  • two axial through holes penetrating through the housing 1 in the axial direction A are also formed at both ends of the main body 11 in the axial direction. It is connected with the corresponding output gear 4 of the differential to realize transmission coupling.
  • the peripheral portion 12 and the main body portion 11 are fixed together.
  • the peripheral portion 12 protrudes radially outward from the main body portion 11 .
  • the peripheral portion 12 is also formed with mounting holes for mounting the bolts 7 distributed at intervals in the circumferential direction.
  • the planet wheel shaft 2 is detachably inserted into the mounting hole of the housing 1 along the radial direction R of the housing 1 and passes through the housing 1 .
  • the planetary gear shaft 2 is used for mounting the planetary gear 3 , so that the planetary gear 3 can rotate together with the planetary gear shaft 2 and the housing 1 as a whole, and at the same time the planetary gear 3 can also rotate around the planetary gear shaft 2 .
  • both ends of the planetary shaft 2 protrude from the main body 11 .
  • Both ends of the planetary gear shaft 2 are formed with mounting portions 21 that fit into the mounting groove 5 c of the input gear 5 .
  • the cross section of the installation part 21 is formed in a square shape.
  • two planetary gears 3 and two output gears 4 constitute a gear transmission mechanism.
  • Each planetary gear 3 meshes with two output gears 4 .
  • each output gear 4 meshes with two planetary gears 3 .
  • the centerline axis of each output gear 4 is consistent with the central axis of the housing 1, and each output gear 4 is directly connected with the half shaft passing through the axial through hole of the housing 1, thus realizing the transmission connection, so that the differential can pass through the output gear. 4 Output torque to the corresponding half shaft.
  • the two planetary gears 3 are respectively mounted on the planetary shaft 2 in a rotatable manner, so that the two planetary gears 3 can rotate together with the housing 1 and the planetary shaft 2 and can also rotate around the planetary shaft 2 .
  • the two planetary gears 3 and the two output gears 4 are all bevel gears.
  • the input gear 5 is arranged coaxially with the housing 1 .
  • the input gear 5 is sleeved on the outside of the main body portion 11 of the housing 1 , and is fixedly mounted on the peripheral portion 12 of the housing 1 via four bolts 7 .
  • the input gear 5 can, for example, be drivingly coupled with the output shaft of the transmission of the vehicle (more specifically, the output gear on the output shaft) so that torque from the outside of the differential (such as the transmission) can be transmitted to the input gear 5 .
  • two mounting grooves 5c corresponding to the mounting portion 21 of the planetary gear shaft 2 are formed on the inner peripheral portion of the input gear 5 .
  • the two mounting grooves 5c are separated by a central angle of 180 degrees and have the same shape.
  • each mounting groove 5c corresponds to the mounting portion 21 of the planetary wheel shaft 2 .
  • each mounting groove 5c includes a square groove portion corresponding to the mounting portion 21 of the planetary wheel shaft 2 (including two plane side walls parallel to each other) and a square groove portion communicating with the square groove portion.
  • the semicircular groove portion (including the arc-shaped bottom wall connecting the above two side walls) makes the profile of the installation groove 5c U-shaped, which is favorable for machining.
  • the use of the square groove and the mounting part 21 cooperates with each other, on the one hand, the contact area between the input gear 5 and the planetary shaft 2 is large enough to facilitate the transmission of large torque; on the other hand, it can prevent the planetary shaft 2 from contacting the input.
  • Gear 5 produces relative rotation.
  • the mounting part 21 includes a plane part in contact with two plane side walls, and the arc-shaped bottom wall restricts the axial movement of the planetary wheel shaft 2 so that the mounting part 21 of the planetary wheel shaft 2 will not enter into the semicircle Therefore, the relative movement of the planetary gear shaft 2 relative to the output gear 4 in its axial direction is avoided.
  • two bearings 6 are installed on the housing 1 in such a way that their respective inner rings are fixed to the axial ends of the housing 1, and the two bearings 6 are used to ensure that the housing 1 is relative to the bearing used to support the differential speed.
  • the transmission housing 1 of the transmission works in normal rotation.
  • the planetary gear shaft 2 passes through the housing 1 and the mounting portion 21 of the planetary gear shaft 2 matches the mounting groove 5c of the input gear 5, the planetary gear shaft 2 and the input gear 5 and the housing can be realized
  • the body 1 is relatively fixed, so the pin 30 described in the background art is omitted, thereby simplifying the structure and saving costs.
  • the case 1 of the differential only plays a supporting role, and compared with the case 10 described in the background art, the volume and weight can be reduced (for example, the wall thickness of the case 1 can be reduced).
  • the housing 1 no longer needs to transmit torque, there is no need to use a large number of bolts 7 to fix the input gear 5 to the housing 1 and no need to apply a large tightening torque to the input gear 5, Therefore, the number of bolts 7 can be correspondingly reduced, the installation process of the bolts 7 can be simplified while the cost is reduced, and the installation problems involved in the background art can be avoided.
  • the joint surface between the input gear 5 and the peripheral portion 12 can be positioned at the approximate axial center of the housing 1 so that there is no impact on the housing 1. In addition, it is easy to adjust the axial position of the input gear 5 and improve the flexibility of the structural layout.
  • the differential according to the present application has one planetary shaft 2 and two corresponding planetary gears 3 , the present application is not limited thereto.
  • the differential according to the present application can have a plurality of planetary gears and a planetary gear 3 respectively corresponding to each planetary gear shaft.
  • a weight reduction hole 11h can also be formed on both sides of the main body part 11 of the housing 1, and the weight reduction holes 11h can also be used for each in the differential. Gears are lubricated, etc.
  • the cross-section of the mounting part 21 is formed into a square shape.
  • the square shape includes a shape whose four sides are straight lines, and also includes two sides matching the installation groove 5c being straight lines and the other two sides being arcs. shape.
  • the planetary shaft 2 is inserted through the corresponding hole of the housing 1, and the shape of the planetary shaft 2 matches the corresponding hole of the housing 1, so that the planetary shaft 2 will not shake after being installed in the housing 1 .
  • an appropriate fit can be adopted between the planet wheel shaft 2 and the corresponding hole of the housing 1 as required, for example, a transition fit can be adopted.
  • the number of bolts 7 used to fix the input gear 5 to the housing 1 is described as four in the above specific embodiments, but the application is not limited thereto. An appropriate number can be selected according to needs, and in an optional solution, the number of bolts 7 is not more than six.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Retarders (AREA)

Abstract

L'invention concerne un différentiel, comprenant : un engrenage d'entrée (5) apte à recevoir un couple externe à partir du différentiel ; un arbre planétaire (2) s'étendant le long d'une direction radiale (R) de l'engrenage d'entrée (5) et présentant un couplage de transmission directe à l'engrenage d'entrée (5) ; un engrenage planétaire (3) monté sur l'arbre planétaire (2) et apte à tourner autour de l'arbre planétaire (2) ; et un engrenage de sortie (4) qui s'engrène avec l'engrenage planétaire (3) et est apte à transmettre un couple à l'extérieur du différentiel. De cette manière, le problème de la géométrie de boîtier surdimensionnée et du poids lourd dû à la nécessité d'un transfert de couple à travers un boîtier du différentiel est évité, un nombre de boulons utilisés pour la fixation entre l'engrenage d'entrée et le boîtier est réduit, les coûts correspondants sont diminués et le problème de l'installation de boulon est éliminé.
PCT/CN2021/117728 2021-09-10 2021-09-10 Différentiel Ceased WO2023035232A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2021/117728 WO2023035232A1 (fr) 2021-09-10 2021-09-10 Différentiel
CN202180100774.XA CN117677519A (zh) 2021-09-10 2021-09-10 差速器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/117728 WO2023035232A1 (fr) 2021-09-10 2021-09-10 Différentiel

Publications (1)

Publication Number Publication Date
WO2023035232A1 true WO2023035232A1 (fr) 2023-03-16

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PCT/CN2021/117728 Ceased WO2023035232A1 (fr) 2021-09-10 2021-09-10 Différentiel

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CN (1) CN117677519A (fr)
WO (1) WO2023035232A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117759703A (zh) * 2024-02-06 2024-03-26 上海汽车变速器有限公司 一种行星架结构、输出半轴以及减速装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030144107A1 (en) * 2002-01-31 2003-07-31 Orr Brian Christian Differential gear assembly
CN1488527A (zh) * 2003-08-30 2004-04-14 柳青松 新型差速器
CN2723772Y (zh) * 2004-08-06 2005-09-07 文登市东风车桥厂 小型卡车的四行星齿轮差速器
CN101590810A (zh) * 2009-07-02 2009-12-02 浙江理工大学 行星齿轮轴与从动齿轮直接装配的车辆主传动总成

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014000430B4 (de) * 2014-01-16 2017-07-13 Audi Ag Differenzialgetriebe
CN108799443A (zh) * 2018-07-10 2018-11-13 重庆青山工业有限责任公司 一种汽车变速器的差速组件

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030144107A1 (en) * 2002-01-31 2003-07-31 Orr Brian Christian Differential gear assembly
CN1488527A (zh) * 2003-08-30 2004-04-14 柳青松 新型差速器
CN2723772Y (zh) * 2004-08-06 2005-09-07 文登市东风车桥厂 小型卡车的四行星齿轮差速器
CN101590810A (zh) * 2009-07-02 2009-12-02 浙江理工大学 行星齿轮轴与从动齿轮直接装配的车辆主传动总成

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117759703A (zh) * 2024-02-06 2024-03-26 上海汽车变速器有限公司 一种行星架结构、输出半轴以及减速装置

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