RU2422297C1 - Clutch-reduction gear with hydraulic resilient member - Google Patents

Abstract

FIELD: transport. ^ SUBSTANCE: invention relates to machine building and can be used in drive lines of tractors and in road-building machines which work in transient modes of motion. Planetary clutch contains planetary gear group connected with engine, hydropneumatic accumulator, hydraulic pump mechanically connected with sun gear of the gear group, and hydraulic control valve. The clutch is equipped with additional hydraulic pump which is kinematically connected with crown gear. Both pumps are connected with hydropneumatic accumulator via hydraulic control valve, and carrier of the gear group is connected with engine. ^ EFFECT: enhancement of clutch kinematic capabilities, higher reliability and durability of powertrain parts operation, and improvement of vehicle characteristics by means of smooth variation of torsion torque transferred from engine to propellers. ^ 1 dwg

Description

The invention relates to transport engineering and can be used in transmissions of tractors and road-building machines operating in unsteady driving conditions.

Known hydrostatic creeper reducer of a self-propelled machine, containing a gear reduction gear, sequentially installed in the kinematic chain of the transmission, a constant-displacement hydraulic machine connected to the gearbox, in the pressure hydraulic line of which there is a flow regulator with a control, a hydraulic tank (copyright certificate SU No. 1482829 A1, M.cl. B60K 17/10 Hydro-volume creeper reducer of a self-propelled machine. Declared September 16, 1987; Publish. May 30, 1989, Bull No. 20).

A disadvantage of the known design is its complexity, the lack of damping and changes in the operating characteristics of the drive.

A transmission of a vehicle is known comprising a planetary gearbox associated with an engine, a hydraulic accumulator, a hydraulic pump mechanically coupled to one of the planetary gearbox links, and a distributor, the first line of which is connected to the discharge line of the hydraulic pump, and the second - with a drain (copyright certificate SU No. 1592173 A1, M.cl B60K 17/10. Transmission of a vehicle. - Declared 12/12/1988; Publish. 09/15/1990, Bull. No. 34).

The disadvantage of this design is the inability to protect the engine from a complete stop. A device for reducing the stiffness of a vehicle’s transmission is known, which is taken by us for the closest analogue containing a planetary gear, the reactive link of which is connected to an oil pump connected to a suction and pressure lines, pumping oil into a pneumatic accumulator, a gearbox connected to a driven shaft of a planetary gear, oil tank (copyright certificate SU No. 1062035 A, M.cl. B60K 17/10. Device for reducing the stiffness of a vehicle’s transmission. - Claimed 09/07/1982; Publish. 12/23/1983, Bull. No. 47).

The disadvantage of this device, adopted as the closest analogue, is the complexity of the design of the hydraulic system. The presence of three valves in one hydraulic line will not provide a smooth change in the fluid flow in the damper device. Slow emptying of the pneumohydraulic accumulator through the hydraulic pump sets it to reverse rotation, worsening the gear shift mode. The accumulated energy in the pneumatic-hydraulic accumulator does not return to the vehicle transmission.

The problem to which the claimed invention is directed is to simplify the design and increase durability by reducing the wear of transmission parts, eliminating dynamic loads in the power transmission by smoothly changing the transmitted torque and expanding the functionality when installing the gearbox clutch in the transmission.

The technical result consists in expanding the kinematic capabilities, increasing the durability of the coupling and improving the dynamic characteristics of the vehicle.

The specified technical result is achieved by the fact that an additional hydraulic pump is installed in the known planetary clutch, which is kinematically connected to the ring gear, while both pumps are connected to the pneumohydraulic accumulator by means of a hydraulic distributor, and a carrier is connected to the engine.

The invention is illustrated in the drawing, which schematically shows a coupling gear with a pneumohydraulic elastic element.

Information confirming the possibility of implementing the claimed invention are as follows. The clutch gear contains a planetary gear associated with the engine, the input link of which drove 2 is connected to the flywheel 1 of the engine. The main pump 5 is kinematically connected to the sun gear 4, and the additional pump 16 is kinematically connected to the ring gear 13. Both pumps have a common suction line 6 and separate discharge pipes 8 and 17 connected to the distributor 9. The distributor 9 has a drain line 10 connected to the tank 7, and pressure 11, connected to the pneumohydraulic accumulator 12.

The clutch gearbox operates as follows.

Torque from flywheel 1 is transmitted to carrier 2 of the planetary gear. It starts to rotate and transfers the rotation of the engine to satellites 3, which, rotating around its axis, drive the sun gear 4 and the drive of the hydraulic pump 5, which pumps oil into its suction line 6 from the vehicle fluid reservoir 7. Oil under operating pressure enters the pressure line 8 to the distributor 9. If the distributor is closed, the oil goes to the drain to the drain line 10 connected to the reservoir 7. When the distributor 9 is closed, the gearbox is in the off state, the vehicle is not driven in motion, even if the gear is engaged. If the lever of the distributor 9 is put in the “raise” position, the oil enters the pressure line 11 and the pneumohydraulic accumulator 12. The pump 5 delivers the oil until the oil pressure reaches the value balancing the moment of the sun gear acting from the engine side. In this case, the pump 5 will stop, the sun gear 4 of the planetary gear will also stop, but its satellites 3 will begin to rotate around its axis, running around the sun gear, and will transmit the moment to the ring gear 13 and the power transmission shaft 14 connected to the gearbox 15. The vehicle will begin to move forward.

With a significant increase in hook load by switching the distributor 9 to the "lower" position, we turn on the second circuit of the hydraulic system with an additional pump.

Torque from flywheel 1 is transmitted to carrier 2 of the planetary gear. It starts to rotate and transfers the rotation of the engine to satellites 3, which, rotating around its axis, drive the ring gear 13 and the hydraulic pump drive of the pump 16, which pumps oil into its suction line 6 from the vehicle fluid reservoir 7. Oil under operating pressure enters the pressure line 17 to the distributor 9, and along the line 11 to the pneumo-hydraulic accumulator 12. The pump 16 delivers the oil until the oil pressure reaches a value balancing the moment of the ring gear acting from the engine side. In this case, the pump 16 will stop, the ring gear 13 of the planetary gear will also stop, but its satellites 3 will begin to rotate around its axis, running around the ring gear, and will transmit torque to the sun gear 4 and the power transmission shaft 18 connected to the gearbox 15. The vehicle moves forward with a modified gear ratio.

Thus, the invention provides a technical solution for protecting the engine and transmission of a transport vehicle from peak dynamic loads not only at the beginning of acceleration, but also during steady-state movement, preventing the engine from completely stopping by changing the gear ratio.

Information sources

1. A.S. USSR No. 684215, class F16D 43/20. 1979. Planetary clutch with variable characteristic. Declared 07/11/77. Published on September 5th, 1979. Bull number 33.

2. A.S. USSR No. 1482829 A1, cl. B60K 17/10. 1989. Hydro-volume creeper reducer of a self-propelled machine. Declared September 16, 87. Published on May 30, 89. Bull number 20.

3. A.S. USSR No. 1592173 A1, class B60K 17/10. 1988. Transmission vehicle. Declared 12.12.88. Published on September 15th, 1990. Bull. Number 34.

Claims (1)

A planetary coupling comprising a planetary gearbox connected to the engine, a pneumatic hydraulic accumulator, a hydraulic pump mechanically connected to the sun gear of the gearbox, and a hydraulic control valve, characterized in that it is equipped with an additional hydraulic pump that is kinematically connected to the ring gear, while both pumps are connected to the pneumohydraulic valve via a hydraulic control valve a battery, and a gear carrier is connected to the engine.