Cam-conical differential

FIELD: transport mechanical engineering.

SUBSTANCE: cam-conical differential comprises housing (1), pinion (2) of the differential, carrier (3) with conical satellites (4), two conical differential gears (5), and two braking mechanisms (6). Braking mechanisms (6) are composed of two cylinders (7) and (8). One face of cylinders (7) and (8) has three expansion cams (9), and the other face is flat. Three stop projections (10) are made over periphery of the cylinders of braking mechanisms (6). The cylinders arrest angular rotation and are arranged at an angle of 120° over the periphery of the cylinder. Cylinder (7) of each braking mechanism (6) is rigidly connected with housing (1) of the differential. The smooth face of second cylinder (8) is provided with friction coating (11) that slides over the rim of the differential gear. The expansion cams of the cylinders face each other.

EFFECT: expanded functional capabilities.

2 dwg

 

The invention relates to the field of transport engineering, in particular to mechanical transmissions of cars.

Known symmetric conical differential (Usachov CENTURIES, Frumkin, A. Car. Analysis of the structures, elements of calculation: Educational. a manual for students of the specialty "Automobiles and automobile economy". - M.: Mashinostroenie, 1989. - S), which is a planetary gear with two degrees of freedom and comprising a housing, gear differential, drove with installed tapered satellites and two half-shaft bevel gear.

The disadvantage of this differential is that when driving on the road with different coefficients of coupling leading to the road wheels are not ensured full implementation on the drive wheels torque supplied from the engine to the differential, there is a significant reduction of permeability of the car, his dynamism until the complete stop of the vehicle when one rotating (stalled) and the second stopped the wheels. This is because when you hit one wheel is on a surface with low coupling properties, such as ice, it starts to slip, and kinematically associated with the other wheel stops, as a design feature of the cone is about differential is both wheels is implemented is equal to the moment, and it is proportional in magnitude to the force of adhesion of the wheels with the road, in the worst of adhesion road conditions, i.e. stalled.

The technical result is aimed at expanding the functionality of the differential, automatic change of the ratio differential lock in range (0<Kb<1), respectively, and factor reallocation of time from 1 to ∞up to a full locking differential, depending on road conditions and coupling characteristics of the support surface, and, consequently, increase accessibility and responsiveness of the car while maintaining the positive properties of simple conical differential, such as high stability, controllability and safe braking "engine" in conditions of ice.

The technical result is achieved by the fact that the differential includes a housing, gear differential, drove with installed tapered satellites, two half-shaft bevel gear, two brake mechanism consisting of two cylinders, one end side of which has three expanding Cam having a sinusoidal profile of the ring section and the second end face is flat, while on the periphery of the cylinders of the brakes is made by Tr the hard ledge, limiting the angular rotation and disposed at angle 120° around the circumference of the cylinder, one cylinder of each brake mechanism is rigidly connected to the housing of the differential, and the second cylinder smooth front surface coated with a friction coating slips on the rim of polovoy gear, expander Cams cylinders of the brake mechanism are facing each other, with the tops of the expanding Cams one cylinder are in depressions expanding Cams of the other cylinder of the brake mechanism.

The hallmark of the prototype is that it is further provided with two brake mechanisms, consisting of two cylinders, one end side of which has three expanding Cam having a sinusoidal profile of the ring section and the second end face is flat, while on the periphery of the cylinders of the brakes is made by three of the thrust lug limiting the angular rotation and disposed at angle 120° around the circumference of the cylinder, one cylinder of each brake mechanism is rigidly connected to the housing of the differential, and the second cylinder smooth front surface coated with a friction coating slips on the rim of polovoy gear, expander Cams cylinders of the brake mechanism are facing each other, with peaks expanding Kul is ccov one cylinder are in depressions expanding Cams of the other cylinder of the brake mechanism.

Figure 1 shows the kinematic diagram of the inventive differential, figure 2 - shape of cylinders of the brakes.

The differential includes a housing 1, a gear differential 2, led 3 with installed tapered satellites 4, two half-shaft bevel gear 5, two brake mechanism 6, consisting of two cylinders 7 and 6, one end side of which has three expanding the Cam 9 having a sinusoidal profile of the ring section and the second end face is flat, while on the periphery of the cylinders 7 and 8 brake b is made of three resistant ledge 10, limiting the angular rotation and disposed at angle 120° the circumference of the cylinders 7 and 8, one the cylinder 7 of each of the brake mechanism 6 is rigidly connected with the housing 1 differential, and the second cylinder 6 smooth front surface coated with a friction coating 11 slides on the rim of polovoy gear 5, expander Cams 9 cylinders 7 and 8 of the brake mechanism 6 facing each other, with the tops of the expanding Cams 9 one cylinder are in depressions 12 expanding Cams 9 on the other cylinder of the brake mechanism 6.

Next, the index "1" marked items left branches of the power differential and, consequently, the index "2" is the right branch of the power differential.

Cam-bevel differential gear works the following way.

The first operating mode (initial position).

At equal values of coupling the right and left wheels with the ground as straight-line and curvilinear motion with regard to road irregularities under pure rolling wheels on the road is provided with high maneuverability, fuel efficiency as when using conventional conical differential small friction /1/, since the relative speed of rotation of the half-shaft gears 51and 52relatively small, while the ratio of redistribution of moments is very small and similar in magnitude to the unit. Brake mechanisms in this mode, do not enter.

The second operating mode (differential lock).

For dierent values of the coupling of the right and left wheels with the ground wheel, falling on a surface with less friction, for example the left on the ice, it begins to stall, and the rotational speed of the opposite wheel decreases, while the relative speed is kinematically connected to the driving wheels of half-shaft gears 51and 52increases, and with it the speed of rotation of polovoy gear 51"stalled" wheels on the differential housing 1. The frictional force produced by the rotation of polovoy gear 51relative to the cylinder 8 1the brake mechanism 61that drags in the direction of rotation of polovoy gear 51the cylinder 81that is, moving in a sinusoidal profile expanding Cams 91and getting jammed between polovoy gear 51and the cylinder 71rigidly connected to the housing of the differential gear 1, inhibits half-shaft gear 51regarding the differential housing 1, thus automatically locking the Cam-bevel differential. When this torque applied to the differential case 1 and transmitted through the half-shaft gear 51to the right leading wheel, fully implemented on the right wheel when slipping the left.

The third mode (unlock differential).

Overcoming a difficult stretch of road, skidding the wheel lands on a section of road with good coupling properties, the drag torque on polovoy gear 51increases, which leads to turning polovoy gear 51relative to the housing 1 in the opposite direction relative to the rotation of the differential housing 1, while the cylinder 81the brake mechanism 61carried a polovoy gear 51return to the starting position (first operating mode), the differential is unlocked.

The axial projections 10, the implementation is built on the cylinders 7 and 8, limit their angular turn, excluding the turn of the cylinders 7 and 8 relative to each other by an angle greater 120°.

When the vehicle does not require driver intervention in the operation of conventional prefilled auto-disable Cam-bevel differential, locking and unlocking of the differential is brakes automatically, depending on road conditions and friction wheels with the road, thus determining the optimal characteristics of a Cam bevel differential. The value of the coefficient of the differential lock when this varies, corresponding to the driving mode of the vehicle depending on road conditions, namely from 0 to 1, respectively, and the values of coefficient of redistribution of moments also vary within wide limits from 1 to ∞. The braking torque developed brake mechanisms 6, is in the range from zero to the value that allows you to stop half-shaft gear 51slipping wheel on the differential housing 1 and lock the differential. When this braking torque proportional to the angular velocity of rotation of polovoy gear 51slipping wheel on the differential housing 1 and the force pressing the friction surface 11 Rethimno Cup 81to polovoy gear 51, to the which also is a function of the relative angular velocity, summed axial force occurring in mesh half-shaft bevel gears 5 and satellites 4.

Thus, when the operation of the vehicle equipped with Cam-bevel differential on paved roads, the brake mechanisms are inactive, only playing the role of support washers half-shaft gears, and the differential operates as a simple small conical friction. Brake mechanisms involved in the work at slipping one of the leading wheels and automatically lock the differential. Unlock differential occurs automatically when you hit "stalled" wheels on the surface with satisfactory properties clutch drive wheel with the road.

Cam-bevel differential, comprising a housing, gear differential, drove installed on it tapered satellites and two half-shaft bevel gear, characterized in that it further provided with two brake mechanisms, consisting of two cylinders, the end face of which has three expanding Cam having a sinusoidal profile of the ring section and the second end face is flat, while on the periphery of the cylinders of the brakes is made by three of the thrust lug limiting the angular rotation and disposed at angle 120° around the circumference of the cylinder, and od is the cylinder of each brake mechanism is rigidly connected to the housing of the differential, and the second cylinder smooth front surface coated with a friction coating slips on the rim of polovoy gear, expander Cams cylinders of the brake mechanism are facing each other, with the tops of the expanding Cams one cylinder are in depressions expanding Cams of the other cylinder of the brake mechanism.



 

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SUBSTANCE: cam-conical differential comprises housing (1), pinion (2) of the differential, carrier (3) with conical satellites (4), two conical differential gears (5), and two braking mechanisms (6). Braking mechanisms (6) are composed of two cylinders (7) and (8). One face of cylinders (7) and (8) has three expansion cams (9), and the other face is flat. Three stop projections (10) are made over periphery of the cylinders of braking mechanisms (6). The cylinders arrest angular rotation and are arranged at an angle of 120° over the periphery of the cylinder. Cylinder (7) of each braking mechanism (6) is rigidly connected with housing (1) of the differential. The smooth face of second cylinder (8) is provided with friction coating (11) that slides over the rim of the differential gear. The expansion cams of the cylinders face each other.

EFFECT: expanded functional capabilities.

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