BG60825B1 - Hydromechanical stepless gear box - Google Patents

Abstract

The gear box can be used basically in the motor-car industry. It has simplified design and reduced cost. It performs stepless two-way transfer of a changing torque in forward driving and its one-way constant transfer in rear driving, smooth switching and stepless changing in forward drive of the transmitted torque and sufficiently big range between the maximum and minimum gear ratio. The gear box includes a pump (12) of a torque converter, connected, on one side, across a lamella clutch (8) to a shaft (4) carrying a small central gear (12) of the double planetary mechanism, and on the other side - across shaft (7) of the turbine (1) of the torque conveter to a second big central gear (14) of the same double planetary mechanism. The two central gears (12 & 14) are coaxially positioned and have the same number of satellite gears (10 & 13). Each of gears (12, 14) is meshed to a satellite gear of the other group which is found under/over it, and the satellite gears (10) of the big central gear (14) are also meshed to a crown gear (11) fitted to the outlet shaft (15) of the box. The axes of the two groups of satellite gears are fixed to a common pinion carrier (17) connected to mechanism (9) which locks it or releases it to/from the housing (16) of the box.

Description

TECHNICAL FIELD

The proposed gearbox applies. to heavy machinery and more specifically to the production of hydromechanical gearboxes designed, in particular. for use in the automotive industry.

PREVIOUS BACKGROUND OF THE INVENTION

A single-stage hydromechanical gearbox is known, comprising an inlet shaft connected to a two-flow hydrotransformer, to which the pump is connected to a gear wheel by a planetary mechanism. The central gear is engaged with a set of satellite gears, which are also engaged with a gear wheel connected to the turbine of the transformer, and the satellite gears are guided by an output shaft / 1 /.

A known box provides one forward gear.

It is an object of the invention to provide a hydromechanical stepless gearbox that is structurally simplified, with ease of operation and providing smooth start-up, a steady change in the transmitted torque with a sufficiently large range between maximum and minimum gear ratios.

SUMMARY OF THE INVENTION

The hydromechanical stepless gearbox includes an inlet and outlet shaft, a torque converter, a locking clutch and a brake. The pump of the hydrotransformer is connected by a locking clutch to a central gear wheel of a planetary mechanism. The center gear is engaged by two sets of satellite gear wheels with a crown gear on the output shaft at the same time as a second central gear which is connected to the turbine of the hydraulic transformer. The two sets of satellite gears are located on a guide connected to the brake

The claimed gearbox provides stepless two-speed front-end torque and one-way reverse. In addition, the box is of a simplified construction since known assemblies and elements are used and complex hydropneumatic controls are avoided.

DESCRIPTION AND THE FIGURES Attached

The invention is better illustrated in the accompanying drawings, where:

FIGURE 1 is a basic kinematic diagram of the box;

FIGURE 2 is a schematic view of the twin satellite gear sets.

EXAMPLES FOR THE IMPLEMENTATION OF THE INVENTION

The hydromechanical stepless gearbox consists of an input shaft 1, a hydrotransformer and a planetary mechanism with dual satellite gears. The inlet shaft 1 is connected to the pump 2 of the hydrotransformer, wherein the pump 2 is connected to a central gear 3 of the planetary mechanism. A locking clutch 4 is mounted between the pump 2 of the transformer and the central gear 3. The central gear 3 is engaged with a set of satellite gears 5 which are engaged with a second set of satellite gears 6. The second set of satellite gears 6 is a gear unit 6. side is a second central gear 7 and on the other side is a crown gear 8, which is connected to an output shaft 9. The second central gear 7 is connected to the turbine 10 of the transformer. The first 5 and second 6 sets of satellite gears are located on a common guide 11 which is connected to the brake 12.

The construction described in this way is as follows:

- When idling, clutch 4 and brake 12 are off. The motor drives the pump 2 of the hydraulic transformer. Mechanically, the pump does not transmit further rotation, since clutch 4 is switched off. By increasing the speed, the pump 2 hydraulically rotates the turbine 10 and, through its shaft, the central gear wheel 7. The latter in turn rotates a set of satellite gears 6, a set of satellite gears 5 and the connected gear wheel 3 and associated with the latter. clutch part 4. Since the brake 12 is not engaged, the guide 11 also rotates and does not transmit rotary motion to the crown gear 8 and to the output shaft 9.

- In the forward travel, clutch 4 is engaged, brake 12 is not engaged. As the pump 2 is rotated, through the clutch 4 and its shaft, a central gear wheel 3 is rotated, which, through satellite gears 5 and 6, guide 11 rotates in the opposite direction a central gear wheel 7 and a turbine 10 pa of the hydraulic transformer. Until some point, the crown 8 and the output shaft 9 remain stationary. By increasing the speed of pump 2, through the said transfer of rotational motion, the speed of the turbine 10 increases and the difference in their angular rotational speed increases until the pump 2 hydraulically begins to stop the turbine 10 and central gear 7 until they stop and rotate in the direction of rotation of pump 2 until their rotation is equal. The summed rotary motion of the central gears 3 and 7 cc transmits via a guide 11 and satellite gears 5 and 6 a gear wheel c. Respectively to an output shaft 9, which from time to time rotates in the direction of rotation of the pump 2 and smoothly reaches the speed on the input shaft or respectively. of the engine.

- D1 reversing clutch 4 is off, brake 12 is on. The rotational motion of the pump 2 ee transmits by hydraulic means to the turbine 10 and the central gear 7, which rotates the crown (gear 8 and the output shaft 9 in the opposite direction to the rotation of the pump 2 or the inlet shaft through the satellite gears 6). 1. Satellite gears 5 and center gear 3 rotate spuriously.

BACKGROUND OF THE INVENTION The invention can find application in a large majority of self-propelled machines, except those which have to work equally in front and back (front wheel loaders, rollers and forklifts)

Claims (1)

E is a chromoshapic stepless gearbox, including an inlet and outlet shaft, wherein the inlet shaft is connected to a hydrotransformer, the pump of which is connected to a central gear wheel by a planetary mechanism, which the central gear wheel is engaged by a set of gear wheels with a gear wheel Characterized in that a locking clutch (4) is mounted between the pump (2) of the torque converter and the central gear (3), and a set of satellite gears (5) are engaged with both the central gear (3) and p a second set of satellite gears (6), the second set of satellite gears (6) being secured on one side with a second central gear (7) and on the other with a crown gear (8) connected to the output shaft (9) , wherein the first (5) and second (6) satellite gear sets are located on a common guide (11) connected to a brake (12) and the second central gear (7) is connected to the turbine (10) of the hydraulic transformer.