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WO2007037647A1 - Différentiel à glissement limité pour véhicule - Google Patents

Différentiel à glissement limité pour véhicule Download PDF

Info

Publication number
WO2007037647A1
WO2007037647A1 PCT/KR2006/003916 KR2006003916W WO2007037647A1 WO 2007037647 A1 WO2007037647 A1 WO 2007037647A1 KR 2006003916 W KR2006003916 W KR 2006003916W WO 2007037647 A1 WO2007037647 A1 WO 2007037647A1
Authority
WO
WIPO (PCT)
Prior art keywords
differential
differential case
limited slip
gears
friction
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/KR2006/003916
Other languages
English (en)
Inventor
Young-Shik Pyoun
Jeong-Hyeon Park
Young-Choon Lee
Ho-Tae Kim
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.)
TIC JINHEUNG CO Ltd
Industry University Cooperation Foundation of Sun Moon University
Original Assignee
TIC JINHEUNG CO Ltd
Industry University Cooperation Foundation of Sun Moon University
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 TIC JINHEUNG CO Ltd, Industry University Cooperation Foundation of Sun Moon University filed Critical TIC JINHEUNG CO Ltd
Publication of WO2007037647A1 publication Critical patent/WO2007037647A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
    • F16H48/22—Arrangements for suppressing or influencing the differential action, e.g. locking devices using friction clutches or brakes
    • 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
    • B60K17/18—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location or kind of gearing of differential gearing in which the differential movement is obtained by resilient means
    • 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
    • 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
    • F16H2048/085—Differential gearings with gears having orbital motion comprising bevel gears characterised by shafts or gear carriers for orbital gears
    • 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
    • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
    • F16H2048/204—Control of arrangements for suppressing differential actions
    • 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
    • F16H48/38—Constructional details
    • F16H48/40—Constructional details characterised by features of the rotating cases

Definitions

  • the present invention relates to a limited slip differential for a vehicle and, particularly, to a limited slip differential for a vehicle that limits differential action by using friction force resulting from a difference in the number of revolution between side gears and friction rings and is also capable of varying force for limiting differential action even after it is assembled.
  • vehicles travel by transmitting power generated from an engine to a driving shaft through a power transmission, and by rotating wheels.
  • Such power transmissions transmitting engine power are composed of a clutch that selectively transmits engine power, a transmission that changes rotational force of the engine transmitted from the clutch depending on the travel speed of a vehicle, and a differential that receives the rotational force outputted from the transmission through a propeller shaft and appropriately adjusts the number of revolution of wheels at both sides.
  • the differential compensates a difference in the number of revolution of inner and outer wheels and allows the vehicle to smoothly turn by decreasing the number of revolution of the inner wheel and increasing the number of revolution of the outer wheel, that is, changes the number of revolution of each of the wheels in consideration of different moving distances of the wheels.
  • a differential case 10 that has a ring gear 2 rotated by an input shaft 1, two side gears 3,4 which are mounted in the differential case 10 and are inserted in left/ right axle shafts 20,20' connected with left/right wheels, pinion gears 5 that are rotatably fitted to a pinion shaft fixed to the differential case 10 and also rotate by engaging with the side gears 3,4, and a limiting means that limits differential action in the gears 3,4 and the differential case 10.
  • the limiting means includes a preload spring 30 that is disposed between the side gears 3,4 under a predetermined pressure and a multiple disc clutch 40 that limits differential action, in which the inner plates connected to the side gears 3,4 and outer plates connected to the inside of the differential case 10, respectively, are pushed to each other by the preload spring 30, when a difference in revolution appears in both plates.
  • the multiple plate clutch 40 in a limiting means limits differential action by a difference in number of revolution of the left/right side gears 3,4 and recovers driving force by rotating both wheels at the same speed.
  • Korean Patent Registration No. 295863 titled "limited slip differential of vehicle,” is disclosed.
  • a preload spring 42 is provided and a counterload spring 36 that is formed in a dish shape by forming an incline 36S with a predetermined angle at the rear surface to provide elastic force against thrust of a side gear 32 in the limited slip differential 30 is mounted.
  • the reference numeral 38 represents a pinion gear.
  • friction force of the limited slip differential 30 is generated depending on the magnitude of elastic force of the counterload spring 36 and thrust of the side gear 32, and when thrust of the side gear 32 that is generated by load transmitted through an axle shaft 35 is larger than elastic force of the counterload spring 36, the angle of inclination of the counterload spring 36 changes into verticality by the thrust of the side gear 32 and a cone clutch 40 contacts with the inner side of a housing 34 (differential case) by pushing of the outer periphery of the counterload spring 36 and friction force is generated; as a result, differential action is limited.
  • force for limiting differential action is generated by combination of the elastic force of the preload spring and counterload spring, but noise is made by friction with the housing, and not only a driver cannot adjust desired limiting force due to the above combination of the elastic force, but it is difficult to change the elastic force after assembly of the springs is completed.
  • the invention is designed to overcome the problems, and it is an object of the invention to provide a limited slip differential for a vehicle that has simple structure and small volume and makes little noise, and also is improved in the structure to improve force for limiting differential action and capable of varying the above force even after assembling is completed.
  • a limited slip differential includes a differential case that has a ring gear rotated by an input shaft; two side gears which are rotatably mounted in the differential case and are respectively connected to left/right axle shafts that are respectively connected with left/ right wheels; pinion gears that are rotatably fitted to a pinion shaft fixed to the differential case and also rotate by engaging with the side gears; and a limiting means that limits differential action generated in the side gears and the differential case.
  • the side gear is tapered to have an incline on its one side
  • the limiting means includes the incline of the side gear and the friction rings having the inner side tapered to be in face contact with the tapered side of the side gear, rotating with the differential case by connecting with the differential case using fastening means, and pushed to the side gear by elastic force of one or more springs provided between the side gear and the differential case.
  • an elasticity control part is disposed at one side of the spring and adjusts friction force between the side gear and the friction ring by transmitting variable pressure to the spring side, and the incline of the side gear and the inner side of the friction ring have a dimple structure by surface treatment.
  • the limited slip differential generates force for limiting differential action by using friction force between side gears and friction rings and is capable of varying the force for limiting differential action after assembly.
  • the limited slip differential is capable of varying the force for limiting differential action according to the pressing amount of springs due to fastening force of bolts, even after the side gears and the friction rings are in face contact with each other by pre-pressure of the springs. Accordingly, it has an advantage of improving facility in use and saving components because combination of the springs are not needed.
  • FIG. 1 is a view showing configuration of a typical limited slip differential.
  • FIG. 2 is a cross-sectional view of an example of a conventional limited slip differential.
  • FIG. 3 is a perspective view of a limited slip differential for a vehicle according to an embodiment of the invention.
  • FIG. 4 is a perspective partial cross-sectional view of main parts according to the embodiment of the invention.
  • FIG. 5 is a perspective exploded view according to the embodiment of the invention.
  • FIGS. 6 and 7 are a perspective view and a cross-sectional view of a friction ring according to the embodiment of the invention.
  • FIG. 8 is a cross-sectional view illustrating combination conditions according to the embodiment of the invention.
  • FIG. 9 is a perspective expanded view showing a part of the surface of a side gear and a friction ring that cause friction according to the embodiment of the invention.
  • a limited slip differential includes a differential case 110 that has a ring gear (not shown) engaged with an input shaft (not shown) so that it rotates together with the input shaft to transmit driving force of an engine, side gears 210,220 that are disposed at both sides in the differential case 110 and connected with left/right axle shaft for left/right wheels, pinion gears 410,420 that are engaged with the side gears 210,220 such that they rotate together with the side gears, a pinion shaft 405 that is fitted in the pinion gears 410,420, a limiting means that limits differential action generated from the pinion gears 410,420, side gears 210,220, and differential case 110 by using friction force between the side gears 210,220 and the friction rings 310,320.
  • the limiting means is designed such that a frictional surface where inclines 210a,220a of the side gears 210,220 are in face contact with the inner side 310a, 320a of the friction ring 310,320 is tapered and the friction rings 310,320 are elastically biased in one direction and pushed to the side gears 210,220 by elasticity control part having a plurality of spring 510,520.
  • the friction rings 310,320 and the side gears 210,220 are formed in a cone clutch type. When the friction rings and side gears rotate at the same speed, friction is not caused; however, when they have different number of revolution, friction is caused.
  • one or more of springs 510,520 are arranged in parallel and stuck to each other, and bolts 710,720 are fastened through the differential case 110 at the outside of the springs to push the springs 510,520.
  • the springs 510,520 may be a dish-typed spring whose inner peripheral surface is tapered.
  • the washers 530,540 are preferably a ring-shaped thrust washer to correspond to the shape of the springs 510,520.
  • the bolts 710,720 for pushing the washers 530,540 against the spring 510,520 are fastened through the differential case 110 from the outside and the ends of the bolts 710, 720 passing through the differential case 110 are in contact with the washers 530,540.
  • the bolts 710,720 are fastened into the through holes 115,116 through the thread at the inner side of the holes, so that pre-pressure applied to the springs 510,520 is variable depending on tightening force of the bolts 710,720.
  • An angle of inclination ⁇ formed by a side of the side gears 210,220 and the inner side of the spring 510,512 may be about 1 to 89°. However, as the angle of inclination gets closer to 1°, the side of side gear gets closer to perpendicularity, and as it gets closer to 89°, the side of gear gets closer to horizontality, so that it is preferable that the angle of inclination ⁇ ranges from 10 to 80°. [47] As the angle of inclination increases within the above range, the contact area of the side gears and springs and friction force increases. As the angle of inclination decreases, friction force decreases.
  • a plurality of fastening holes 312,322 are formed through the outer side of the friction ring 310,320 facing and opposite to the ring gears to combine the friction rings 310,320 to the differential case 110.
  • Locking pins 610 are fitted into the fastening holes 312,322 or through holes 114, 112 are formed through the differential case 110 to fasten fixing bolts 620.
  • fitting holes 114a where anti-releasing pins 615 are inserted are horizontally formed on the outside of the differential case 110 to prevent the locking pins 610 from releasing after the friction ring 310 being fitted in the fastening holes 312.
  • the fixing bolt 620 passes through the through hole 112 of the differential case 110, and is inserted into the fastening hole 322 of the friction ring 320.
  • spiral oil grooves 314,324 are formed on the one incline 210a, 220a of the side gears 210,220 or the inner sides 310a,320a of the friction rings 310,320.
  • the grooves may be formed in any shape of a radial shape, a strait line shape, or etc.
  • a center latch that is fitted to the pinion shaft 405 and fixed to the pinion shaft 405 by a fastening member 455 is further provided between the side gears 210,220 at both sides and the pinion gears 410,420.
  • the center latch 450 contacts with the side gears 210,220 that are elastically supported by the springs 510,520 and prepares for pressure of the springs 510,520, so that it makes assembly easy and limits the maximum contact between gear teeth of the side gears 210,220 and the pinion gears 410,420.
  • the fastening member 455 (a bolt or a pin whose periphery is tapped) is fastened through a fastening hole 452 of the center latch 450 and a fastening hole 450b of the pinion shaft 405 to prevent the center latch 450 from sliding on the periphery of the pinion shaft 405.
  • reference numeral 405a represents a fixing pin for fixing the pinion shaft 405 to the differential case 110 and a reference numeral 625 represents a fixing washer for fastening a fixing bolt 620 in the through hole 112.
  • the pulsation range is determined depending on a ratio of number of revolution of the side gears 210,220 and the friction rings 310,320, but it is preferable to determine the pulsation range in consideration of relationship of the type of vehicle and friction force.
  • the friction force acts as force for limiting differential action that is transferred toward the side gears 210,220 at the opposite side through the differential case 110.
  • friction force for limiting differential action can be easily controlled without large changes in size and weight through the number of the spring 510,520, spring coefficient, displacement of variable adjustment using a bolt, as well as the size of the friction rings 310,320, angle of inclination of frictional portion, friction area, nano-surface layer dimple- structuring of the frictional portion.
  • friction force i.e. force for limiting differential action
  • force for limiting differential action can be easily controlled by controlling the elasticity of the springs 510,520 using the bolts 710,720 depending on the type of vehicle or road conditions, thus the force for limiting differential action can be easily adjusted.

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

Abstract

La présente invention concerne un différentiel à glissement limité qui comprend un carter de différentiel qui possède une couronne tournée par un arbre d’entrée ; deux planétaires de différentiel qui sont montés de façon rotative dans le carter de différentiel et sont respectivement reliés à des arbres de roue gauche/droit qui sont respectivement reliés à des roues gauche/droite ; des engrenages à pignon qui sont installés de façon rotative sur un arbre de pignon fixé au carter de différentiel et tournent également en entrant en prise avec les planétaires de différentiel ; et un moyen limiteur qui limite l’action différentielle générée dans les planétaires de différentiel et le carter de différentiel. Selon l’invention, même après que les planétaires de différentiel et anneaux de friction sont assemblés dans une condition de contact de face par la pré-pression du ressort, la force pour limiter l’action différentielle est réglable selon la quantité de compression du ressort. Ainsi, grâce à l’invention, la commodité durant l’utilisation peut être augmentée considérablement et le bruit est également réduit en grande partie en appliquant un traitement de surface de couche nano de structure d’encoche sur des surfaces de friction pour améliorer la durabilité et réduire le bruit.
PCT/KR2006/003916 2005-09-30 2006-09-29 Différentiel à glissement limité pour véhicule Ceased WO2007037647A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020050091793A KR100628840B1 (ko) 2005-09-30 2005-09-30 차량용 차동제한장치
KR10-2005-0091793 2005-09-30

Publications (1)

Publication Number Publication Date
WO2007037647A1 true WO2007037647A1 (fr) 2007-04-05

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PCT/KR2006/003916 Ceased WO2007037647A1 (fr) 2005-09-30 2006-09-29 Différentiel à glissement limité pour véhicule

Country Status (2)

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WO (1) WO2007037647A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116357715A (zh) * 2023-04-03 2023-06-30 博格华纳汽车零部件(北京)有限公司 一种机械锁止式限滑差速器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101070021B1 (ko) 2007-08-31 2011-10-04 (주)세고스 예압 상태의 탄성 스프링이 부착된 자동폐쇄장치
KR101896525B1 (ko) * 2014-09-26 2018-09-10 (주)이큐브시스템 차동 제한 장치

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0814362A (ja) * 1994-06-30 1996-01-16 Suzuki Motor Corp 差動制限装置
US5520589A (en) * 1993-10-14 1996-05-28 Clark Equipment Company Differential
KR20030082047A (ko) * 2002-04-16 2003-10-22 (주) 엠엔테크 마찰판식 자동차용 차동 제한 장치
KR20040023042A (ko) * 2002-09-10 2004-03-18 현대자동차주식회사 차량용 차동제한장치
JP2005098385A (ja) * 2003-09-25 2005-04-14 Ikeya Formula Kk デファレンシャル装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520589A (en) * 1993-10-14 1996-05-28 Clark Equipment Company Differential
JPH0814362A (ja) * 1994-06-30 1996-01-16 Suzuki Motor Corp 差動制限装置
KR20030082047A (ko) * 2002-04-16 2003-10-22 (주) 엠엔테크 마찰판식 자동차용 차동 제한 장치
KR20040023042A (ko) * 2002-09-10 2004-03-18 현대자동차주식회사 차량용 차동제한장치
JP2005098385A (ja) * 2003-09-25 2005-04-14 Ikeya Formula Kk デファレンシャル装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116357715A (zh) * 2023-04-03 2023-06-30 博格华纳汽车零部件(北京)有限公司 一种机械锁止式限滑差速器

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