Self-locking differential of wheeled transport facility

FIELD: transport.

SUBSTANCE: proposed differential comprises differential gearing with central gear wheels rigidly engaged with drive wheel semi-axles 16, 16', locking device including servo drive, coupler with its drive half-coupling 14 rigidly engaged with pinion frame 17 while driven half-coupling 13 is fitted in splines of one of said semi-axles to axially displace thereon and engaged with servo drive. Control member comprises angular speed transducers, measurement and comparison circuit with its output connected to servo drive, hydraulic pumps 3, 3' coupled with semi-axles and, via hydraulic lines, with double-sided hydraulic cylinder 7. Hydraulic cylinder pistons are coupled with spring-loaded rods 8, 8' coupled, in their turn, with control cylinders 9, 9' to shut off in turn said hydraulic lines 11, 11'. Note here that shut0ff hydraulic line communicates with control cylinder 12 of servo drive via check valve 20 and restrictor 21.

EFFECT: simplified automatic locking, faster operation.

1 dwg

 

The invention relates to vehicles and can be used in wheeled tractors, graders and road cars.

Known self-locking differential wheeled vehicles

[1], the principle of auto-lock control which is based on a comparison of the ratio of angular velocities of the leading axes (boards) with a given (critical) value of αkr=Rmin/rminwhere Rminand rmin- the minimum possible external and internal radii of the trajectories described by the leading wheel when maneuvering the machine.

The disadvantage of this differential is that it is blocked by reducing the speed of the machine, by reason of slippage of about 20%. The actuator continues to rotate at a speed corresponding to the speed of movement of the machine before the start of slippage. For this reason, the trigger lock is accompanied by significant dynamic loads in the transmission.

Currently the best solution of the considered problem can be proposed in the work [2] symmetric gear differential with automatic locking device, excluding the occurrence of the above-mentioned dynamic loads. This is achieved by the fact that the algorithm automatically lock control based on the compared and the angular acceleration of the slippery side of the critical value, commensurate with the values of εkraccelerations at high speed, pulling away, the acceleration and deceleration of the movement of the machine. This is because when the sliding Board from participation in transition processes falls the weight of the whole machine, in General, and a significant part of the rotating parts of the transmission and skidding of the wheels. In the wheel of the slippery side rotate with acceleration greater than the acceleration that occurs in these situations, the movement of the machine without slippage (3).

The study of equations describing the proposed control algorithm, showed that the acceleration of the wheels of the slippery side exceeds the acceleration εTrwheels in the absence of slippage in several (sometimes more than an order of magnitude) times. Thus the ratio of accelerations εbTr(and εbMAN) does not depend on the absolute values of the speed of the machine.

The disadvantage of the mentioned design differential is noncompactness. They are constructed from several separate systems, including electronic components (system speed measurement, system conversion speed in the acceleration signal, system comparison of velocities (accelerations) of the boards, time relay, system form the control signal acting on the actuator (drive clutch lock) etc).

The objective of the invention is simplified is in the automatic locking differential drive and improve its performance.

The technical result is to reduce the complexity of service management system, reducing the dynamic loads on the drive motor and transmission, improving the reliability and durability of the machine. This is achieved by the fact that in cambiocorsa differential wheeled vehicles, containing a differential gear, a Central wheel which is rigidly connected with the axles of drive wheels, and a locking device including a servo motor, coupling coupling, leading coupling which are rigidly connected to the planet carrier and the led mounted on the splines of one of the axes with the possibility of axial movement and kinematically connected with the servo, and the governing body containing the sensor of angular velocity and measurement scheme and comparison is managing Ornan contains hydraulic pumps, kinematically associated with the axes and hydraulically, through highways, two-way hydraulic cylinder, the pistons of which are connected with the spring-loaded rods, which are connected with the control cylinder is configured to alternately overlap of these highways. When this non-hedged line communicates with the cylinder control servo through parallel mounted check valve and choke.

Figure 1 shows the fundamental solution of the conventional prefilled auto-disable differential made with heromachine the institutions governing body of the lockup clutch. The proposed differential contains a differential gear 1, 2, 2' of the blocking device and the governing body. The governing body includes two hydraulic pumps 3, 3', kinematically connected with Cam mechanisms 19, 19' with pausetime the differential gears 2, 2' and forcing oil (tank 4) through the reverse (shutoff) valves 5, 5' highway 6, 6' on the comparator resistance. The latter is in the form of two-way hydraulic cylinder 7 and the two spring-loaded rods 8, 8', rigidly connected with the control cylinders 9, 9', overlapping railway 6,6'. Thus pumped oil through the choke 10, 10' is returned to the tank 4. The choke 10, 10' are configured to resist movement of the oil corresponding to the necessary pressure in the line 6, 6' and the time for actuation of the locking system.

When slipping, for example, the right side in the rotational speed of the wheels of the right side is accelerated to a value several times larger than the value of having a place to slippage. Oil consumption (pump capacity 3') increases several times, and increases the pressure (resistance to fluid motion in a right line, by the way, is proportional to the square of the velocity of the oil in the right cavity of the control cylinder 7. The cylinder piston 7 moves to the left, through the rods 8, 8' moves in the Evo pistons driven cylinder 9, 9. The right hand line 11' is connected with the cylinder of the servo control 12 through parallel mounted check valve 20 and the orifice 21. The left line 11 remains closed. The servo moves the coupling block 13 in the direction of coupling with the coupling 14. Due to the presence of slots in the hub of the coupling 13 and the axis 16 of the latter is deprived of mobility relative to the pinion carrier 17 of the differential, and the differential is locked. Nebukawa and skidding the wheels begin to rotate with the same speed, thereby and provided increased tyagovostsepnym properties of the bridge and cross machine as a whole.

It is not difficult to verify that you are slipping the left wheel (side) the rotational speed of the left wheel is accelerated to a value several times larger than the value that occurs during the movement without slippage. Oil consumption (performance left pump 3) increases several times and increases the pressure (resistance to movement of the oil in the left cavity of the cylinder 7. The cylinder piston 7 moves to the right, through the rods 8, 8' moves the control pistons of the cylinders 9, 9'. Thus overlaps the right line 11' and reportedly left the line 11 with the cylinder servo control 12 through parallel mounted check valve 20 and the orifice 21. Right line 11' is blocked by the. The servo moves the coupling block 13 in the direction of engagement with the coupling 14 and locks the differential, just as it was when slipping starboard side.

When locked, the differential rotation speed of the left 16 and right 16' axes, and the left and right pumps 3, 3' are identical, and the latter implement the same oil supply. As a result, the pressure oil in the left and right cavities of the cylinder 7 is aligned. Under the pressure of the springs 18, the piston cylinder 7 is neutral, and hydraulic 6 6', 11, 11' are returned in the original (neutral) condition. The piston 12, and hence the coupling 13 is also returned to its original position under the influence of spring 22, and the coupling 13 disengages from the coupling 14. When this differential is unlocked and the drive becomes differential properties. In the remaining situation of slippage, the differential will immediately be blocked and re-unlocked, i.e. it will be "bell effect". In order to avoid such phenomenon, the resistance of the inductor 21 is the (configurable) so that the oil from the cylinder 12 was spent in the process of unlocking differential slow, for some (specified) time. This will avoid the "bell"effect, and differential axle in complex traffic situations will periodically the key (after a specified period of time) to become unblocked and, if necessary, blocked, yet will remain complex traffic situation.

Feature of the proposed system automatic lock is that it can have an arbitrarily high speed, because instantly reacts to changes in pressure in the oil line. Therefore, it is instantly responsive to the acceleration of the slipping wheel in several (sometimes on the order) times higher than any acceleration in the absence of slippage (when changing speeds while maneuvering the machine).

The performance of the pumps connected kinematically with wheels is directly proportional to the rotation frequency, and the resistance line movement of the fluid is directly proportional to the square of the speed (flow) of the fluid. It follows that the pressure in the arteries of the system will vary in direct proportion to the square of the change of frequency of rotation of the wheels of the vehicle, and control system lock will have reliable high-speed signals automatic control.

Sources of information

[1] U.S. Pat. 2162974. Russia. A limited-slip differential wheeled vehicles / Vdesign, Vasander, the VP Lunjevich; JSC "Bryansk Arsenal". - Declared 22.03.99. Publ. 12.11.2000. - 5 S.

[2] U.S. Pat. 2265766. Russia, C1 IPC F16H 48/30, UK 17/16. A limited-slip differential wheel transportnogo the tools / Vdesign, Niesel, Dlginit, Anikeenko, Ahollow; Bran. Ingen.-technology. Acad. Publ. 10.12.05. - 5 S.

[3] Mishagin E Algorithm of automatic control differential lock axle wheeled vehicles /. Vdesign, Niesel, And, Kumkov., Dlginit, Anikeenko, Schekotov // the Contribution of scientists and specialists in the national economy. Proceedings of the regional scientific and technical conference (may 16-18, 2002).

A limited-slip differential wheeled vehicles, containing a differential gear, a Central wheel which is connected rigidly with the axes of the drive wheel, and a locking device including a servo motor, coupling coupling, leading coupling which are rigidly connected to the planet carrier and the led mounted on the splines of one of the axes with the possibility of axial movement and kinematically connected with the servo, and the governing body containing the sensor of angular velocity and the scheme of measurement and comparison, the output of which is connected to the actuator, characterized in that the governing body also contains hydraulic pumps, kinematically associated with the axes and hydraulically, through highways, two-way hydraulic cylinder, the piston is connected with the spring-loaded rods, which are connected with the control cylinder is configured to alternately overlap the specified master of the lei, when this non-hedged line communicates with the cylinder control servo through parallel mounted check valve and choke.



 

Same patents:

FIELD: machine building.

SUBSTANCE: improved differential mechanism consists of locking mechanism connected with mechanism (53) of centrifugal load or with lock member interacting with mechanism (53) of centrifugal load to decelerate differential action in differential mechanism.

EFFECT: improved design.

22 cl, 20 dwg

FIELD: machine building.

SUBSTANCE: invention relates to automobile production field, and also transportation equipment. Controllable interwheel (interaxial) differential contains casing (1), in which there are located input shaft (2) with toothed wheel (3), intermediate shaft (4), output shafts (7,8), controlling drive, shaft (5) of controlling drive with toothed wheel (6), lock-up clutch, shaft (9) of blocking mechanism with bevel gear (10), installed on inetrmidiate shaft (4) follower gear (11) of main drive and transmission toothed wheels (12, 13), connected to follower gear of main gear, two symmetric cycloidal reducer (CR), drive pinions (14, 15) of which are implemented at one with driving heliac wheels of these CR and are installed on controlling shafts. Intermediate bodies of revolution consists of duplex in pairs satellites (26, 27), which are installed on eccentrics (22, 23) controlling shafts and connected to each other by means of conical enveloping toothed wheels (24, 25), blocking toothed wheel and control drive (8). In the second version of implementation of controllable inter-wheel (inter-axial) differential it is used one control shaft, on which there are installed stages of front and back CR.

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3 cl, 2 dwg

FIELD: transport mechanical engineering.

SUBSTANCE: differential comprises housing (1) with spider (2) and satellites (3), differential gears (4) and (5), locking hydraulic clutch, planet gear, and control system. The locking hydraulic clutch has housing (6) provided with driving friction disks (7) and driven friction disks (8) connected with housing (1). The control system comprises control unit (14), electric motor (15), pickups (16) of angular velocity, pickups (17) of torque, pickups (18) of linear velocity, and pickups (19) of angle of rotation of the steering wheel. The planet gear has carrier (12) provided with two rows of satellites (10) and (11), solar gear (13), and epicycloid gear (9). Solar gear (13) is connected with one of the differential gears (9), carrier (12) is connected with electric motor (15), and epicycloid gear (9) is connected with housing (6).

EFFECT: enhanced efficiency.

1 dwg

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EFFECT: decreasing of dynamic loads on transmission and drive and increasing reliability and longevity of a vehicle.

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FIELD: transport engineering; transmissions of wheeled vehicles.

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FIELD: transport engineering; transmissions of wheeled vehicles.

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EFFECT: increased capacity owing to automatic reduction of locking at cornering of vehicle and decreased skidding of leading wheel.

2 dwg

FIELD: the invention refers to transport machinery.

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EFFECT: decreasing of dynamic loads on transmission and drive and increasing reliability and longevity of a vehicle.

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FIELD: transport mechanical engineering.

SUBSTANCE: differential comprises housing (1) with spider (2) and satellites (3), differential gears (4) and (5), locking hydraulic clutch, planet gear, and control system. The locking hydraulic clutch has housing (6) provided with driving friction disks (7) and driven friction disks (8) connected with housing (1). The control system comprises control unit (14), electric motor (15), pickups (16) of angular velocity, pickups (17) of torque, pickups (18) of linear velocity, and pickups (19) of angle of rotation of the steering wheel. The planet gear has carrier (12) provided with two rows of satellites (10) and (11), solar gear (13), and epicycloid gear (9). Solar gear (13) is connected with one of the differential gears (9), carrier (12) is connected with electric motor (15), and epicycloid gear (9) is connected with housing (6).

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FIELD: electricity.

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20 cl, 3 dwg

FIELD: electricity.

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EFFECT: simplification of design and improvement of reliability is attained.

18 cl, 4 dwg

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