Automotive self-locking differential gear

FIELD: mechanics, motor industry.

SUBSTANCE: invention relates to machine building and can be used in vehicles and wheeled tractors. The differential gear comprises two differential axles, differential gear throwing in the bevel pinion cage, satellites fitted on the differential axles, a pair of central gear wheels and two two-direction overrunning clutches. Every said clutch has a driven half-coupling rigidly fitted on the bevel pinion cage. The drive half-coupling of both overrunning clutches is rigidly fitted on the differential axle an accommodates a movable inertial plate, spring-loaded tangentially relative to the said axle. The said inertial plate accommodates rigidly fixed jamming elements interacting with the cage.

EFFECT: higher operating performances of vehicles.

3 dwg

 

The invention relates to mechanical engineering and can be used in cars and wheeled tractors.

Known differential of the vehicle containing the differential gear from the engine to the axles of drive wheels, in which the differential lock is the time from the forces of friction between the wheels of the differential gear and planet carrier [1]. A disadvantage of the known device is incomplete block, and decreases transmission efficiency, because of the presence of friction.

Let us assume the prototype is closest to the technical essence and the achieved result, a limited-slip differential wheeled vehicles [2]. It contains two shafts, differential gear, including carriers, satellites, fixed on the two Central axes of the wheels and two overrunning clutches are double-acting, in each of which the slave coupling is made with rigidly mounted on a drive rod glass with pine axis of the cylindrical surface, and the leading coupling rigidly mounted on the shafts with planted it with the possibility of rotation of the inertia disc, friction associated with the axis, the inertial disk is movable in the tangential direction is set in contact with the glass of the spring relative to the inertial disk zaklinivayuschey body.

Signs outside the private device (prototype), coinciding with declare the following. It contains two shafts, differential gear, including carriers, satellites, fixed on the two Central axes of the wheels and two overrunning clutches are double-acting, in each of which the slave coupling is made with rigidly mounted on a drive rod glass and lead coupling is rigidly fixed on the half-axis with planted it with the possibility of rotation of the inertia disc, and on the inertial disk is installed in contact with the glass zaklinivayuschey body.

In the prototype due to the presence of the frictional connection between the coupling halves samorasprostranenie differential is impossible, since for this purpose it is necessary to automatically return the coupling to its original position, which prevents the friction torque between the coupling halves. In addition, when driving on uneven roads due to the presence of bumps and jolts on the drive axle of the vehicle is possible spontaneous differential lock, since becoming jammed body have the ability to move in the tangential direction under the action of inertia forces.

The purpose of the invention is the improvement of operational characteristics of the vehicle.

Offer a limited-slip differential vehicle has the following essential features. It contains two shafts, a differential gear, comprising drove, sathe is lita attached to the two Central axes of the wheels and two overrunning clutches are double-acting, in each of which the slave coupling is made with rigidly mounted on a drive rod with an eccentric axis of the cylindrical surface of the Cup, and leading the coupling is rigidly fixed on the half-axis with planted it with the possibility of rotation and a spring-loaded in the tangential direction relative to the axis inertial drive, inertial disk rigidly fixed in contact with the glass zaklinivayuschey body.

Distinctive features of the prototype features of the invention are the following. The proposed device in the tangential direction of the inertial disk relative to the axis spring-loaded, zaklinivayuschey elements rigidly fixed to the inertia disk and the cylindrical surface of the glass eccentric axis.

The design of conventional prefilled auto-disable differential of the vehicle is given in figure 1-3.

The proposed design (figure 1-3) contains two shafts 1, associated with the leading wheels of the vehicle (not shown), a differential gear including kinematically associated with the engine (not shown) drove 2 satellites 3, attached to the two Central axes of the wheels 4 and two overrunning clutches bilateral actions. Each clutch consists of slave coupling is rigidly mounted on the dealers cylindrical Cup 5 with the eccentric axis of the cylindrical surface 6, e - the eccentricity. Axis planted with the possibility of rotation of the inertia disc 7, spring-loaded in the tangential direction of the two springs 8. On the inertial disk rigidly fixed in contact with the inner cylindrical surface of the Cup zaklinivayuschey body 9, α - angle of the wedge, 10 - adjusting screw spring 8A.

The differential operates as follows. With a stationary axis 1 or even the rotation of the inertia disc 7 occupies a middle position under the action of springs 8 (2), wherein between zaklinivayuschey bodies 9 and the cylindrical surface of the Cup there are gaps δ1and δ2. When an angular acceleration ε drive wheel, mounted on the axle 1, the inertial disk 7, overcoming the efforts of the spring 8, is rotated relative to the axis under the action of inertia forces MIN. While gap δ1or δ2depending on the direction of acceleration is selected, zaklinivayuschey body 9a is in contact with the surface 6 of the cylindrical Cup 5 at the point (figure 3). When you do this you have two options:

if the shaft is ahead of the carrier, the coupling of the coupling Salineville body and the differential is locked;

b) if the axle behind drove, locking differential does not occur.

For car or tra is a torus with a diesel engine, provided with a fuel high-pressure pump (injection pump), you have the following options.

The parameters of the diesel engine:

ωn- nominal rotational speed of a crankshaft of the engine;

δpthe degree of irregularity of the pump regulator (δp≅0,07 0,03...);

ε - the load factor of the engine torque (ε≅0,80);

MNthe torque on a shaft of the engine at rated speed;

I refer to the crankshaft of the engine moment of inertia of the system: engine - transmission - wheel:

,

where Id- moment of inertia of the engine;

ITR- converted to the motor shaft moment of inertia powertrain;

ITo- moment of inertia slipping of the wheels relative to the wheel axis.

The parameters of conventional prefilled auto-disable differential:

f is the coefficient of sliding friction,

P - total tangential force acting on the inertial drive from the springs,

Ψ - the angle of rotation of the disk, in which there is differential lock,

Io- the inertia moment of inertia of the disk about its axis of rotation,

R is the inner radius of the inertial disk;

Rpis the radius of the application of a spring force.

Operational parameters:

ρ - coefficient of intensity reducing coupling properties of acwy (ρ ≅2,74);

γSP- the ratio of the relative decline in clutch:where ϕnand ϕxthe coefficients of the clutch wheels, respectively, in good and bad conditions (γSP≅0,20 0,50...);

λ - the distribution coefficient of the vehicle weight on the leading axle,

G - the weight of the car,

RKis the radius of the rolling wheels,

id- the gear ratio of the differential; in this case, when the slippage of one wheel;

i - gear ratio transmission of the vehicle;

η - transmission efficiency.

To select a stiffer spring gpit is necessary to determine the frequency of oscillations in the R inertial drive. The above parameters associated with the parameter p by the following relations:

p=u+ν,

where,,

D=q23>0,

,

,

,,

.

Spring stiffness

.

Unlocking differential occurs automatically when the set difference of the moments of the tractor driving wheels, while the force from the springs Preodolenie the tangential force of friction on the surfaces becoming jammed phone To ensure personal turn off the differential lock when the set difference of the moments of the clutch wheels, dependent γSP, the angle of wedging clutch

,

where.

During movement of the vehicle acceleration axes occurs when starting the acceleration slippage of drive wheels, maneuvering and braking, and the parameters of conventional prefilled auto-disable differential should be chosen from the condition of the differential lock when the slippage of drive wheels. This is achieved by selection of the spring when the specified value of the moment of inertia Iaboutthe inertial drive and the adjusting screw 10 is used to set the optimum ratio of clearances δ1and δ2.

This device can be used in various devices as automatic coupling for coupling or uncoupling of the two shafts when the maximum angular accelerations.

Sources of information

1. Krainev A.F. Mechanics of machines. Fundamental guide. - 2nd ed. M: engineering, 2001 (str, Fig. b).

2. Pat. Of the Russian Federation No. 2089409, UK 17/16 (26.10.94).

A limited-slip differential of a motor vehicle comprising two shafts, a differential gear, comprising a carrier, satellites, fixed on the two Central axes of the wheels and two overrunning clutches doctoron the th action each slave coupling is made with rigidly mounted on a drive rod glass and lead coupling is rigidly fixed on the half-axis with planted it with the possibility of rotation of the inertia disc, and on the inertial disk is installed in contact with the glass zaklinivayuschey body, characterized in that in the tangential direction of the inertial disk relative to the axis spring-loaded, zaklinivayuschey elements rigidly fixed to the inertia disk and the cylindrical surface of the glass eccentric axis.



 

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