CN201651220U - Hydraulic limited slip differential - Google Patents
Hydraulic limited slip differential Download PDFInfo
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- CN201651220U CN201651220U CN2010201505689U CN201020150568U CN201651220U CN 201651220 U CN201651220 U CN 201651220U CN 2010201505689 U CN2010201505689 U CN 2010201505689U CN 201020150568 U CN201020150568 U CN 201020150568U CN 201651220 U CN201651220 U CN 201651220U
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- friction pair
- limited slip
- hydraulic
- oil
- differential
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- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 238000009434 installation Methods 0.000 claims description 10
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 39
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 230000009699 differential effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006798 ring closing metathesis reaction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
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Abstract
The utility model discloses a hydraulic limited slip differential, mainly comprising a shell, a planet wheel train and a hydraulic limited slip mechanism. The hydraulic limited slip mechanism comprises a limited slip friction pair, a hydraulic device and an oil transport tray, wherein the hydraulic limited slip mechanism is arranged at one side or two sides of the planet wheel train and the planet wheel train, the limited slip friction pair and the hydraulic device are arranged in the shell; a gear back of a half-axle gear of the planet wheel train is separated from the limited slip friction pair; an active friction slice of the limited slip friction pair is coupled with the shell by a spline tooth; a driven friction slice of the limited slip friction pair is coupled with the half-axle gear at the same side by the spline tooth. The hydraulic device comprises an annular oil cylinder and an annular piston, wherein the annular oil cylinder is separated from the limited slip friction pair by the annular piston. The oil transport tray is arranged on the axle neck of the shell and an oil groove is arranged on the oil transport tray and communicated with the annular oil cylinder. The advantages are that: while in operation, the counterforce of the friction pair on the annular piston only acts on the differential shell and does not acts on other parts and the operation is stable.
Description
Technical field
The utility model relates to a kind of hydraulic limited slip differential, is mainly used in automobile, agricultural transportation vehicle, industrial wheeled equipment and other wheel machine, belongs to mechanical engineering and Vehicle Engineering field.
Background technique
The differential mechanism of vehicle drive axle is the important component part of vehicle driveline, and the plain edition differential mechanism mainly is made up of planetary pinion, cross axle, differential gear and housing.The effect of differential mechanism is when ransaxle both sides vehicle wheel rotational speed inconsistent (as turn inside diameter), realizes differential action, avoids wheel to drag cunning, reduces running resistance and tire wear.But the shortcoming of this open differential not poor the turning round that be differential, if ignore the frictional force of differential mechanism inside, the driving force of left and right sides driving wheel equates, when vehicle travels on the asymmetric road surface that coefficient of attachment separates, when the coefficient of attachment on both sides wheel and ground is inconsistent, the driving force of vehicle is attached the little dypass face of coefficient and limits, cause the little single wheel original place of coefficient of attachment significantly to be trackslipped, and the opposite side wheel is slack, the tractive force of motor can't normally be brought into play, vehicle can't advance, even because wheel slip, the horizontal adhesion on ground reduces, and the horizontal slippage of driving wheel takes place, vehicle takes place to break away out of control, causes the accident.The advanced vehicle of technology mostly adopts traction control system (TCS) or claims vehicle limited slip control system (ASR) at present, TCS (or ASR) is mainly by reducing engine power (as reducing throttle, less fuel injection quantity) and taking measure such as suitable braking to reduce driving force, avoid excessively trackslipping of wheel, but these methods have reduced the driving force of wheel, the situation that vehicle can't advance may occur.Some high capacity waggon and engineering machinery are then installed differential lock on differential mechanism, in case of necessity differential mechanism is pinned, allow two side drive wheel with the speed rotation, improved the driving force of vehicle, the differential mechanism of the complete self-locking of mechanical type needs manually to operate under vehicle stop state, in case forget the releasing self-locking, will increase running resistance, increase oil consumption, tire wear is serious.
For fear of above-mentioned situation, people have developed the friction disk type limited-slip differential, increased limit sliding/friction pair in differential mechanism inside, when trackslipping appears in the both sides wheel, limit sliding/friction pair is compacted, produce to stop the frictional force of trackslipping, the wheel drive power of the side of trackslipping is partly transferred on the wheel that opposite side do not trackslip, thereby improved the driving force of car load.But the sliding effect of this passive limit has a shortcoming, and when the vehicle normal turn, the sliding effect of the limit of friction pair takes place in the same old way, is unfavorable for the turning driving of vehicle, and differential mechanism can not be controlled locking coefficient according to pavement behavior.
Newest form of active limited-slip differential can in time be regulated the pressure of limit sliding/friction pair according to the wheel slip situation, has avoided the invalid friction of limit sliding/friction pair.But, at present the friction disk type that occurs initiatively the pressure of the limit sliding/friction pair of limited-slip differential be mostly to drive, apply by thrust-bearing from the differential carrier external body by motor driving or fluid power, can cause vibration and abnormal sound so undoubtedly; Simultaneously, the pressure of limit sliding/friction pair can produce reaction force to the supporting structure of outside, causes the supporting structure distortion, and fatigue crack can appear in long-term use.Therefore, need develop a kind of new limited-slip differential, can realize that sliding effect control effectively to its limit, avoid occurring defectives such as vibration, abnormal sound and structural fatigue again.
The model utility content
Technical problem to be solved in the utility model provides a kind of new hydraulic limited slip differential.
The technical scheme in the invention for solving the technical problem is: this hydraulic limited slip differential is characterized in that: comprise housing, planetary gear train and the sliding mechanism of hydraulic pressure limit; The sliding mechanism of described hydraulic pressure limit comprises limit sliding/friction pair, hydraulic pressure installation and oil transportation dish, the sliding mechanism of hydraulic pressure limit places the one or both sides of planetary gear train, planetary gear train, limit sliding/friction pair and hydraulic pressure installation place in the housing, and the back of tooth of the differential gear of planetary gear train and limit sliding/friction pair are separated by housing; The active friction plate of limit sliding/friction pair connects by spline tooth with housing, and the differential gear from movable friction plate and homonymy of limit sliding/friction pair connects by spline tooth; Hydraulic pressure installation comprises annular cylinder and annular piston, and described annular cylinder and limit sliding/friction pair are separated by annular piston; Described oil transportation dish is located on the axle journal of housing, and described oil transportation dish is provided with oil groove, and this oil groove is communicated with annular cylinder.
Further, housing described in the utility model is provided with oil duct, and the oil groove of oil transportation dish is communicated with annular cylinder by this oil duct.
Compared with prior art, the utility model has the advantages that: (1) differential mechanism can be regulated the friction torque of friction pair on demand by the sliding mechanism of hydraulic pressure limit, realize effective control of differential mechanism locking coefficient, satisfy power character and stability requirement under the different driving conditions of vehicle.(2) with hydraulic fluid pressure as controlled quentity controlled variable, control piston is to the impacting force of limit sliding/friction pair, the friction torque of change limit sliding/friction pair, the mode of this kind hydraulic control friction torque is applicable to various vehicles, for the application of limited-slip differential on various vehicles provides precondition.(3) hydraulic jack places differential casing inside, when annular piston compresses limit sliding/friction pair, friction pair only acts on the differential casing to the reaction force of annular piston, can not constitute influence to outside other component, therefore, this pressure actuated device that will limit the sliding/friction pair is located at the structure of enclosure interior, can avoid occurring defectives such as vibration, abnormal sound and structural fatigue again to the sliding effect of the limit achieve effective control of limit sliding/friction pair.(4) based on above advantage, the utility model can be realized the smooth transfer of moment of torsion, guarantees that vehicle transmission system stable working, vibration are little, the control accuracy height.
Description of drawings
Fig. 1 is the structural representation of the utility model differential mechanism;
Fig. 2 is the right elevation of the right axle shaft gear of planetary gear train among Fig. 1;
Fig. 3 is the A-A sectional view of Fig. 2;
Fig. 4 is the right elevation of the annular piston of hydraulic pressure installation among Fig. 1;
Fig. 5 is the B-B sectional view of Fig. 4;
Fig. 6 is that enlarged view is looked on the left side of the oil transportation dish of the sliding mechanism of hydraulic pressure limit among Fig. 1;
Fig. 7 is the C-C sectional view of Fig. 6;
Fig. 8 is that the left side of right shell body is looked and dwindled figure among Fig. 1;
Fig. 9 is the D-D sectional view of Fig. 8;
Figure 10 is the right elevation of the middle casing among Fig. 1;
Figure 11 is the E-E sectional view of Figure 10;
Figure 12 is that the right side of left shell is looked and dwindled figure among Fig. 1;
Figure 13 is the F-F sectional view of Figure 12;
Figure 14 is that enlarged view is looked on the right side from movable friction plate of limit sliding/friction pair among Fig. 1;
Figure 15 is the G-G sectional view of Figure 14;
Figure 16 is that enlarged view is looked on the right side of the active friction plate of limit sliding/friction pair among Fig. 1;
Figure 17 is the H-H sectional view of Figure 16.
Wherein, 1-left shell, 2-middle casing, the 3-right shell body, 4-bolt, 5-bolt, the 6-cross axle, 7-planetary pinion, 8-left half axle gear, 9-right axle shaft gear, the 10-active friction plate, 11-is from movable friction plate, the 12-annular cylinder, 13-annular piston, 14-oil transportation dish, the 15-oil groove, 16-oil duct, 17-hanger, the 18-rotating seal ring, 19-axial seal ring, 20-tapered roller bearing, the spline tooth of 21-right axle shaft gear, the back of tooth of 22-right axle shaft gear, the outer ring closure gasket groove of 23-annular piston, the inner ring closure gasket groove of 24-annular piston, the axle journal of 25-right shell body, 26-rotary seal annular groove, the spline tooth of 27-middle casing, the circular groove of 28-middle casing, the circular groove of 29-left shell, 30-be from the spline tooth of movable friction plate, the spline tooth of 31-active friction plate.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Hydraulic limited slip differential of the present utility model mainly comprises housing, planetary gear train and the sliding mechanism of hydraulic pressure limit.Fig. 1 to Figure 17 shows the structure of a kind of mode of execution of the present utility model.
As shown in Figure 1, for ease of assembly and disassembly, housing can be made of left shell 1, middle casing 2 and right shell body 3, and wherein, left shell 1 is fixedly connected by bolt 4 with middle casing 2, and middle casing 2 is fixedly connected by bolt 5 with right shell body 3.
Planetary gear train comprises cross axle 6, planetary pinion 7, left half axle gear 8 and right axle shaft gear 9.Four axial end portion of cross axle 6 place the circular groove 30 of left shell 1 and the circular groove 29 of middle casing 2 to form in the circumferential equally distributed hole, make planetary gear train integral body be positioned at the cavity of left shell 1 and middle casing 2 formations.As shown in Figure 1, left half axle gear 8 and right axle shaft gear 9 are inequality, and left half axle gear 8 is conventional differential gears, and the axle journal of right axle shaft gear 9 prolongs relatively, as shown in Figures 2 and 3, is processed with spline tooth 21 on right axle shaft gear 9 axle journals.
The sliding mechanism of hydraulic pressure limit comprises limit sliding/friction pair, hydraulic pressure installation and oil transportation dish, as shown in Figure 1, the sliding mechanism of hydraulic pressure limit places the right side of planetary gear train, limit sliding/friction pair and hydraulic pressure installation are positioned at housing, limit sliding/friction pair is separated by the back of tooth 22 of the right axle shaft gear 9 of housing and planetary gear train, be under pressure in limit sliding/friction pair and do the time spent, housing plays a supportive role to it, can the smooth transfer friction torque when guaranteeing its pressurized, can not cause vibration and abnormal sound, thereby guarantee the control accuracy and the reliably working of limited-slip differential because of reasons such as distortion.As Fig. 1 to Fig. 3, Figure 10, Figure 11, Figure 14 to shown in Figure 17, the spline tooth 31 of the active friction plate 10 of limit sliding/friction pair forms splined with the spline tooth 27 of middle casing 2, and that limits the sliding/friction pair forms splined from the spline tooth 30 of movable friction plate 11 and the spline tooth 21 of right axle shaft gear.As another kind of mode of execution of the present utility model, can be provided with the sliding mechanism of hydraulic pressure limit (not shown) in the and arranged on left and right sides of planetary gear train.
Hydraulic pressure installation comprises annular cylinder 12 and annular piston 13.Wherein, as Fig. 8 and shown in Figure 9, on right shell body 3, directly process a circular groove, and this circular groove is formed annular cylinder 12 with secondary separation of limit sliding/friction by annular piston 13, thereby annular cylinder 12 and limit sliding/friction pair are separated by annular piston 13, and annular cylinder 12 and annular piston 13 are by axial seal ring 19 sealing hydraulic oil.Oil transportation dish 14 is located on the axle journal 25 of right shell body 3, as Fig. 6, shown in Figure 7, oil transportation dish 14 is provided with oil groove 15, and this oil groove 15 is communicated with the oil duct 16 of annular cylinder 12 by right shell body 3, and the axle journal 25 of oil transportation dish 14 and right shell body 3 is by rotating seal ring 18 sealing hydraulic oil.As shown in Figure 8, can be inner along circumferentially being evenly distributed with three oil ducts 16 at right shell body 3, when three oil ducts 16 are communicated with the circumference oil groove 15 of a complete circle, can realize the hydraulic oil conveying and the oil return of quick, big flow, reduced the response time of hydraulic system, can avoid simultaneously losing efficacy, improve the reliability of hydraulic system because of the part obstruction of oil duct 16.
The main effect of oil transportation dish 14 is the annular cylinders 12 that are communicated with the differential casing inside of fixing hydraulic circuit in the outside and rotation.When differential mechanism is worked, as Fig. 6, shown in Figure 7, two hangers 17 of the symmetrical distribution on the oil transportation dish 14 constrain in oil transportation dish 14 on the parts of outer, stationary, make oil transportation dish 14 can not follow the differential casing rotation, seal hydraulic oil by rotating seal ring 18 between oil transportation dish 14 and the limited-slip differential right shell body 3.The fixation of 17 pairs of oil transportation dishes 14 of hanger just limits rotatablely moving of its circumferencial direction, its axial motion on the right side of limited-slip differential right shell body 3 axle journal 25 is not limited, the motion state of oil transportation dish 14 on axle journal 25 is exactly axial float like this, thereby the variation that can guarantee input torque in the differential mechanism working procedure vibration, the distortion that cause, can not injure rotating seal ring 18, increase the working life of rotating seal ring 18.
The working procedure of the utility model hydraulic limited slip differential is: when the vehicle normal turn is travelled, the utility model hydraulic limited slip differential is identical with the working method of open differential, because the not compacted combination of limit sliding/friction pair, differential mechanism only plays differential action and does not play the sliding effect of limit, and main reducing gear is passed to moment of torsion mean allocation between the semiaxis of both sides of differential carrier.When in vehicle straight-line travelling or the turning driving process because road surface, the left and right sides adheres to that condition is asymmetric to make single wheel take place excessively to trackslip, the sliding mechanism of hydraulic pressure limit starts working, high pressure oil enters annular cylinder 12 through oil transportation dish 14 along oil duct 16, promote annular piston 13 and compress limit sliding/friction pair, when pressure is eliminated movement clearance and extrude in the friction pair most of lubricant oil, active friction plate 10 and between movable friction plate 11, enter boundary lubrication condition, begin to form bigger friction torque, at this moment, frictional force becomes the resistance of the relative rotary motion that stops the both sides differential gear, the driving torque of the single wheel that trackslips is shifted to the non-wheel that trackslips of opposite side, make the good wheel of surface friction coefficient can obtain bigger moment of torsion, thereby increased the driving force of the non-wheel that trackslips, improved the driving force of vehicle integral body.
In this mechanism, the annular piston that the increase of oil pressure brings has a upper limit to the increase of friction pair pressure, that is to say, in the state that changes differential mechanism input torque mean allocation on the wheel of both sides, must guarantee active friction plate 10 and be unlikely to because pressure is excessive locked fully from movable friction plate 11, desirable operation point is to be on sliding wear and the locked boundary line, so both can limit excessively trackslipping of single wheel, in time realize both sides wheel differential action in the time of guaranteeing again to change, avoid dragging cunning at the Vehicular turn angle.
The pressure of annular cylinder 12 is regulated by automatical control system in the hydraulic mechanism, automatical control system is judged the travelling state of vehicle by the wheel speed sensors signal, when the friction condition on both sides tire and road surface changes on a large scale, wheel speed is inevitable significantly to be changed, automatical control system is simultaneously with reference to turn signal, in time by the oil pressure in the regulation of hydraulic system annular cylinder 12, increase or reduce the pressure of 13 pairs of limits of annular piston sliding/friction pair, change limited-slip differential to the allocation proportion of input torque between the wheel of both sides, change the drive condition of vehicle, guarantee the power character and the riding stability of vehicle.
Claims (2)
1. a hydraulic limited slip differential is characterized in that: comprise housing, planetary gear train and the sliding mechanism of hydraulic pressure limit; The sliding mechanism of described hydraulic pressure limit comprises limit sliding/friction pair, hydraulic pressure installation and oil transportation dish, the sliding mechanism of hydraulic pressure limit places the one or both sides of planetary gear train, planetary gear train, limit sliding/friction pair and hydraulic pressure installation place in the housing, and the back of tooth of the differential gear of planetary gear train and limit sliding/friction pair are separated by housing; The active friction plate of limit sliding/friction pair connects by spline tooth with housing, and the differential gear from movable friction plate and homonymy of limit sliding/friction pair connects by spline tooth; Hydraulic pressure installation comprises annular cylinder and annular piston, and described annular cylinder and limit sliding/friction pair are separated by annular piston; Described oil transportation dish is located on the axle journal of housing, and described oil transportation dish is provided with oil groove, and this oil groove is communicated with annular cylinder.
2. hydraulic limited slip differential according to claim 1 is characterized in that: described housing is provided with oil duct, and the oil groove of oil transportation dish is communicated with annular cylinder by this oil duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201505689U CN201651220U (en) | 2010-04-02 | 2010-04-02 | Hydraulic limited slip differential |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201505689U CN201651220U (en) | 2010-04-02 | 2010-04-02 | Hydraulic limited slip differential |
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| CN201651220U true CN201651220U (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201505689U Expired - Fee Related CN201651220U (en) | 2010-04-02 | 2010-04-02 | Hydraulic limited slip differential |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793317A (en) * | 2010-04-02 | 2010-08-04 | 浙江理工大学 | Hydraulic limited slip differential |
| CN102829152A (en) * | 2012-09-15 | 2012-12-19 | 浙江理工大学 | Turn flow type hydraulic limited slip differential |
| CN103344365A (en) * | 2013-06-27 | 2013-10-09 | 中国南方航空工业(集团)有限公司 | Torque measuring device |
| WO2017124371A1 (en) * | 2016-01-21 | 2017-07-27 | Volvo Construction Equipment Ab | Differential locking system in inboard wet brake axle |
| CN108713117A (en) * | 2016-02-23 | 2018-10-26 | 伊顿智能动力有限公司 | Hydraulic control unit with charging port |
| CN115451098A (en) * | 2022-08-17 | 2022-12-09 | 西北工业大学 | Limited slip differential based on face gear pair |
-
2010
- 2010-04-02 CN CN2010201505689U patent/CN201651220U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793317A (en) * | 2010-04-02 | 2010-08-04 | 浙江理工大学 | Hydraulic limited slip differential |
| CN101793317B (en) * | 2010-04-02 | 2012-07-25 | 浙江理工大学 | Hydraulic limited slip differential |
| CN102829152A (en) * | 2012-09-15 | 2012-12-19 | 浙江理工大学 | Turn flow type hydraulic limited slip differential |
| CN102829152B (en) * | 2012-09-15 | 2016-08-17 | 浙江理工大学 | A kind of reverse-flow type hydraulic limited slip differential |
| CN103344365A (en) * | 2013-06-27 | 2013-10-09 | 中国南方航空工业(集团)有限公司 | Torque measuring device |
| WO2017124371A1 (en) * | 2016-01-21 | 2017-07-27 | Volvo Construction Equipment Ab | Differential locking system in inboard wet brake axle |
| CN108713117A (en) * | 2016-02-23 | 2018-10-26 | 伊顿智能动力有限公司 | Hydraulic control unit with charging port |
| CN108713117B (en) * | 2016-02-23 | 2022-05-10 | 伊顿智能动力有限公司 | Hydraulic control unit with filling opening |
| CN115451098A (en) * | 2022-08-17 | 2022-12-09 | 西北工业大学 | Limited slip differential based on face gear pair |
| CN115451098B (en) * | 2022-08-17 | 2024-04-26 | 西北工业大学 | Limited slip differential based on face gear pair |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20130402 |