Self-locking differential with additional free satellites

FIELD: machine building.

SUBSTANCE: self-locking differential includes housing in which pin (2) with two main satellites (3) and two differential gears interacting with them and fixed on wheel semi-axles are arranged. Two locking satellites (7) fixed on common axle (8) are also arranged in the housing. Diameter of locking satellites (7) is less than diameter of the main satellites (3). Locking satellites (7) are constantly engaged with one of differential gears. Gears and satellites can be conical. Common axle (8) of locking satellites (7) is perpendicular to wheel semi-axles, that is perpendicular to differential symmetry axis and its ends are arranged in diametrically located openings (9) made in the housing. Axle (8) of locking satellites is equipped with the device restricting its turning angle.

EFFECT: invention allows improving reliability and combines the possibility of self-locking operating mode and standard operating mode.

3 cl, 5 dwg

 

The invention relates to the field of engineering, namely to a differential gear, and can be used in vehicles.

The well-known "classical" differential wheeled vehicles [see, for example, the description of the bevel gear differential in the Internet at the address http://tezcar.ru/u-differecial.html].

The differential is designed to transfer the torque from the main transmission to the axes of the pair of wheels drive axle and allows you to rotate the axes at different speeds when turning the car on a rough road. Gear-bevel differential has a half-shaft bevel gear fixed on the axes, and the satellites are mounted on a common axis (finger), installed in the housing, which is attached to covering his slave the gear.

When the rotation of the driving gear and driven gear torque is transmitted to the satellite axis, then through satellites to the half-shaft gears and shafts.

When driving on a straight and level road wheels meet the same resistance and rotate with the same frequency. The satellites around their axes do not rotate, and both wheels are the same torque. As soon as traffic conditions change, for example, by rotation, one axis starting the em to spin slower as the wheel to which it relates, meets with great resistance. The satellites come into rotation around its axis, objetivas by slowing polovoy gear and increasing the frequency of rotation of the second axis. As a result, the wheel accelerates its rotation and goes a long way along the arc of the outer radius.

This design is simple to manufacture and reliable, while the drive wheels are inextricably linked with the road. But when one wheel is in the air or on ice, spinning this wheel, while the other, standing on a solid floor, stops the car can not pull away.

These shortcomings are partly deprived of self locking gear differentials, known under the brand name TORSEN.

The TORSEN center differential of the first type [of information can be found on the Internet at the address http://ru.wikipedia.org/wiki/Detroit_Truetrac] gear leading axes and satellites are worm pairs. Each axis has its own satellites, which is a pair associated with satellites opposite axis normal spur gearing. The axis of the satellite perpendicular to the axis. During normal movement and equality transmitted on the half moments, worm pairs "satellite/leading gear" is either stopped or rotated, providing the angular difference near the positions of the axes in turn. Once the differential is trying to give time to one of the axes, the worm pair this axis begins to rasklinivanie and block with a Cup differential, which leads to a partial differential lock. This design works in a wide range of relations torque from 2.5/1 to 5.0/1. Actuation is governed by the angle of the teeth of the worm. Cambiocorsa differential TORSEN, in which a pair of friction acts worm gear described in the patents to the first inventor of such structures - Vernon of Glisman [US 2628508; US 2859641; US 3884096]. Despite a significant increase in the vehicle when using the self-blocking differential, the design has a number of disadvantages. This is because in normal conditions (with good traction) when moving along the arc of a limited-slip differential prevents the rotation of the wheels, causing the tire wear, increased fuel consumption and reducing the car's handling. The differential is quite difficult to make, consists of many parts and prone to wear and tear during operation.

As a prototype of the selected limited-slip differential [EN 2115852], comprising a housing, placed in it the finger with a tapered satellites and interacting with them half-shaft bevel gear, and having more the positive blocking the satellite, which is located between pausetime gears in their axial hole and is connected with one of the toothed clutch, and the other forms a gear transmission internal gear with a gear ratio that is close, but not equal to 1.

This transfer of internal gears with a certain gear ratio provides for movement of the vehicle along the arc of the difference in angular velocities of the axes (wheels) in the same ratio, which is optimal only for an arc of a specific radius. In all other cases, the design causes slippage of one of the wheels, which leads to increased wear, increased load on the transmission and adversely affect the controllability of the vehicle.

The aim of the invention is to improve the reliability of operation of the differential.

Technical result achieved is a combination of the possibility of mode-locking and works in the classical (free) mode.

This goal is achieved by the fact that a limited-slip differential has a housing in which is placed a finger with the main satellites and interacting with them half-shaft gear and blocking the satellite. The prototype differs in that it further comprises a second blocking satellite, fixed on a common axis with the first blocking satellite, the diameter of the block is the dominant satellites less than the diameter of the main satellites, and blocking the satellites are in constant engagement with one of the half-shaft gears, the common axis of the blocking of the satellite perpendicular to the axis of rotation of the differential, and its ends are placed in diametrically located Windows, additionally executed in the housing, with the axis of the blocking satellites equipped with means for limiting its rotation angle.

Means limiting the angle of rotation axis of the blocking satellites may be in the form of a locking clutch, installed on the housing to provide axial movement, a locking sleeve provided with slots for the passage axis of the blocking satellites, each slot has a trapezoid shape, a larger base of which has a size not less than the width of the window casing, and the lower - less than the width of the window.

Means limiting the angle of rotation axis of the blocking satellites may be in the form of springs, the locking position of the free ends of the axis of the blocking of the satellites relative to the body.

In order to better demonstrate the distinctive features of the invention, as examples, do not have any limiting character, the following describes the preferred options for implementation. Examples of implementation is illustrated in the drawings, on which:

Figure 1 - differential, General view, option and is filled with locking spring,

Figure 2 - internal elements with spatial separation,

Figure 3 - differential, General view, a variant with a blocking clutch,

4 is a cross-section (free standing),

5 is the same (locked position).

A limited-slip differential includes a housing 1 in which is placed a finger 2 with two main satellites 3 and interacting with them two half-shaft gears 4 and 5, mounted on the wheel axles 6. The case also has two blocking satellite 7, mounted on a common axis 8, and the diameter of the blocking satellites 7 is smaller than the diameter of the main satellites 3 and block 7 satellites are in constant engagement with one of the half-shaft gears (on the figures with the gear 5). Gear and the satellites can be made conical. Common axis 8 of the blocking satellites 7 perpendicular to the wheel axes 6, that is, perpendicular to the axis of symmetry of the differential and its ends are placed in diametrically located Windows 9, additionally made in the housing 1, with the axis 8 of the blocking satellites equipped with means for limiting its rotation angle.

The common axis of the blocking satellites are limited in movement to the height of the window 9 of the housing or finger 2, as it is above it (in the presented example, the term "on" used in relation to polovoy sisterna, which satellites interact).

The means of limiting the angle of rotation axis 8 of the blocking satellites 7 may be made in the form of springs 10 (Figure 4 and Figure 5), located in the Windows 9 and cooperating with the housing 1 and the axle 8 and the locking position, the free ends of the axis 8 of the blocking satellites 7 Windows 9 (for example, each end in the center of the window).

The means of limiting the angle of rotation axis 8 can be configured otherwise, for example in the form of a locking clutch 11 (3), freely mounted on the housing 1 (covering case 1) with the possibility of axial movement along the body 1. The locking sleeve 11 provided with slots (figure Windows) 12 for the passage of the axis 8 of the blocking satellites. Each slot has mainly the form of an isosceles trapezium. In the context of this description, the term "mainly" means that the line can be rounded angles or slightly curved (concave) side. Greater base of trapezium has a size of not less than (equal to or greater than) the width of the window 12 of the housing and a lower base is less than the width of the window. The axial displacement of the blocking clutch 11 provides the control lever 13, which allows the driver of the vehicle to remotely control the differential operation (rotation). In this performance differential, depending on the position of the lever upravleniya can be brought into a state of auto-lock or function classic (free).

Presented on figures from the construction works as follows.

When the vehicle is straight and the same forces of adhesion of the wheels rotation of the housing 1 is transmitted through the finger 2 main satellites 3 Pelusium the gears 4 and 5 and respectively associated splined connections to the axes 6, the rotating wheel.

When turning the vehicle half-shaft gears 4 and 5 due to major satellites 3 start to rotate in the housing 1 in opposite directions. Blocking the satellites 7 also start to rotate in opposite directions on the axis 8, while the inertia blocking satellites and their force of friction on the axis 8 to tend to rotate the axis 8 in the direction of rotation being in engagement with the locking satellites 7 polovoy gear 5. When the rotation axis 8 of the blocking satellites 7 in the direction of rotation of polovoy gear 5 blocking satellites 7 engages with the main satellites 3, while being in engagement with polovoy gear 5, causing an instant stop of rotation of the half-shafts of the gears 4 and 5 relative to the housing of the differential 1 differential is locked, the shafts rotate as a continuous axis.

To control the operation of the differential lock design has the above-described means of limiting the angle of rotation axis of the blocking satellite of the century

If it is made in the form of springs 10 (Figure 1), placed in boxes 9 and cooperating with the housing 1 and the axis 8, the differential lock will alarm automatically. When turning vehicle speed of rotation of polovoy gear 5 in the case of low inertia and friction tends to turn the axle 8, is insufficient to compress the springs 10 - axis cannot be rotated by an angle required for engagement of the blocking satellites 7 basic 3 satellites. Blocking the satellites 7 freely revolve on the axis 8. The differential works like a classic (free), keeping manageability and transmitting torque to the wheels without a loss.

When the slippage of one of the wheels increases the speed of rotation of polovoy gear 5, the inertial force of the blocking of the 7 satellites capable of overcoming the resistance of the spring 10, to rotate the axle 8 on the angle at which the blocking satellites 7 engages with the main 3 satellites. The differential is locked, slipping of the wheel is stopped. Upon termination of the spin (rotation of polovoy gear 5 in the case 1) of the spring 10 returns the axis 8 in the middle position, moving out of engagement with each other satellites 3 and 7, the differential will return to its original (free) state.

If the means of limiting the rotation is made in the form of a remotely controlled locking clutch 11 (Phi is .3), the construction works as follows.

When raised, the locking sleeve 11 axis 8 of the blocking satellites 7 deals with the short base of the trapezoid of the slots 12, and since it is less than the width of the window 9, the rotation axis 8 is not limited by the width of the window 9, and the sides of the trapezoidal slots 12 of the coupling 11. Therefore, blocking the satellites 7 can't engage with the main 3 satellites. The differential works as a free, blocking the satellites 7 when the slip of the wheels freely rotate on its axis 8.

If necessary, enable the automatic differential lock the driver of the vehicle actuates the control lever 13, which moves the sleeve 11 along the body. In our example, the clutch 11 is omitted, and in its extreme lower position, the axis 8 of the blocking satellites 7 for the top of the long base of the trapezoid of the slots 12. In this position, the angle of the rotation axis 8 is now not limited to the sides of the slots, and is limited only by the width of the window 9 of the housing 1 differential. This allows blocking the satellites 7 to engage with the main satellites 3 when the slippage of one of the wheels, thereby blocking differential.

The advantage of this design is the ability to control the differential lock on the move and under load and the fact that p is loose locks tightly, without slipping. A useful property of the design is the possibility of free rotation axes at some angle (defined by the angle of the rotation axis 8 of the blocking satellites 7 prior to their entrance into engagement with satellites 3) even with the lowered locking sleeve 11. This reduces the additional load on the wheels and axis, inevitable when the differential is locked.

The differential lock can be activated when the vehicle forward and backwards. If the vehicle is alternately slippage of the wheels, axle 8 with the locking satellites 7 will oscillate, blocking slipping wheels alternately.

1. A limited-slip differential having a housing in which is placed a finger with the main satellites and interacting with them half-shaft gear and blocking the satellite, characterized in that it further comprises a second blocking satellite, fixed on a common axis with the first blocking satellite, the diameter of the blocking of satellites is less than the diameter of the main satellites, and blocking the satellites are in constant engagement with one of the half-shaft gears, the common axis of the blocking of the satellite perpendicular to the axis of rotation of the differential, and its ends are placed in diametrically location is different boxes, additionally executed in the housing, with the axis of the blocking satellites equipped with means for limiting its rotation angle.

2. Samolocie differential according to claim 1, characterized in that the means limiting the angle of rotation axis of the blocking satellites, made in the form of a locking clutch, installed on the housing to provide axial movement, a locking sleeve provided with slots for the passage axis of the blocking satellites, each slot has a trapezoid shape, a larger base of which has a size not less than the width of the window casing, and the smaller base is less than the width of the window.

3. A limited-slip differential according to claim 1, characterized in that the means limiting the angle of rotation axis of the blocking satellites, made in the form of springs, the locking position of the free ends of the axis of the blocking of the satellites relative to the housing.



 

Same patents:

FIELD: machine building.

SUBSTANCE: proposed differential comprises annular housing 1 accommodating two coaxial axle helical gears 2, 3 with equal and unilateral inclination of teeth, and sun gears 5, 6 meshed there between and with axle gears 2, 3. Spur pinions with conical faces are arranged in housing dead inclined cylindrical holes arranged in pairs on housing opposite sides and communicated in zone of gearing of every pair of pinions. Inclination of pinions in housing equals axle gear teeth inclination to equal locking angle β. Pinion conical faces are arranged to make obtuse cone base angle equal locking angle β on one side of pinions while, on opposite side, angle at taper face vertex equals or differs from that of dead hole conical end by ±3 degrees.

EFFECT: increased locking factor, simplified design, lower costs.

5 cl, 3 dwg

The invention relates to a transport machine-building and for the establishment of mechanisms of the drive wheels of vehicles

The invention relates to transport machinery and can be used to lock the cross-axle and inter-axle differentials

The invention relates to the transport industry, in particular for use in tractors and cars

The invention relates to transport machinery and can be used as a conventional prefilled auto-disable differential

The invention relates to mechanical engineering and can be used in vehicles

The invention relates to mechanical engineering and can be used as a differential mounted in the driving axles of vehicles

FIELD: machine building.

SUBSTANCE: proposed differential comprises annular housing 1 accommodating two coaxial axle helical gears 2, 3 with equal and unilateral inclination of teeth, and sun gears 5, 6 meshed there between and with axle gears 2, 3. Spur pinions with conical faces are arranged in housing dead inclined cylindrical holes arranged in pairs on housing opposite sides and communicated in zone of gearing of every pair of pinions. Inclination of pinions in housing equals axle gear teeth inclination to equal locking angle β. Pinion conical faces are arranged to make obtuse cone base angle equal locking angle β on one side of pinions while, on opposite side, angle at taper face vertex equals or differs from that of dead hole conical end by ±3 degrees.

EFFECT: increased locking factor, simplified design, lower costs.

5 cl, 3 dwg

FIELD: machine building.

SUBSTANCE: self-locking differential includes housing in which pin (2) with two main satellites (3) and two differential gears interacting with them and fixed on wheel semi-axles are arranged. Two locking satellites (7) fixed on common axle (8) are also arranged in the housing. Diameter of locking satellites (7) is less than diameter of the main satellites (3). Locking satellites (7) are constantly engaged with one of differential gears. Gears and satellites can be conical. Common axle (8) of locking satellites (7) is perpendicular to wheel semi-axles, that is perpendicular to differential symmetry axis and its ends are arranged in diametrically located openings (9) made in the housing. Axle (8) of locking satellites is equipped with the device restricting its turning angle.

EFFECT: invention allows improving reliability and combines the possibility of self-locking operating mode and standard operating mode.

3 cl, 5 dwg

FIELD: transport.

SUBSTANCE: differential mechanism comprises crankcase (1), main gear, simple differential gear, planetary gearbox and friction control clutch. Main gear consists of drive gear (2) and driven gear (3). Driven gear (3) is composed by planet carrier (4) wherein fitted is said simple differential including planet gears (6, 7). Every planet gear (6, 7) is engaged via shaft (15) with planet gear (9) engaged with epicycle (16) and sun gear (8). Every friction control clutch (10, 11) is composed by the set of clutches. Inner drive drum (13) of friction clutch (10) is rigidly engaged with epicycle (16). Inner drive drum (12) of friction clutch (11) is engaged via hollow shaft (17) with sun gear (8). Every outer drum (14) is composed of a unit shared by gears of every planetary gearbox and fitted on fight or left output shaft of differential mechanism.

EFFECT: redistribution of torques at output shafts ratio defined by vehicle running conditions.

4 cl, 2 dwg

Up!