Braking circuit for at least one hydraulic motor.

摘要

1. Braking circuit for at least one fluid motor (1, 2), consisting of : - the said fluid motor (1, 2) equipped with a first main connection (4, 6) and with a second main connection (3, 5), - a main pressurized-fluid source (7) equipped with a delivery connection (8), - a first main conduit (48, 50) connecting the said delivery connection (8) to the said first main connection (4, 6) of the motor, - a second main conduit (49, 51) branching off from the second main connection (3, 5) of the motor, - a main fluid distribution device (17-11-10) capable of occupying at least first and second positions, in its first position ensuring the feeding of the first main connection (4, 6) of the motor (1, 2) with pressurized fluid coming from the delivery connection (8) of the said main source (7) and in its second position cutting off the said feeding of the first main connection (4, 6) with pressurized fluid coming from the said delivery connection (8), - a selective fluid stop means (9) which is arranged on the second main conduit (51, 49) and which, when the main fluid distribution device is put in its second position, forms a restriction relative to the flow of the fluid in this second main conduit, thus forming a hydrostatic brake of the motor, and - a brake (26, 27) which is independent of the motor and is coupled to it (28, 29) and which is equipped with a pressurized-fluid control device (30, 31) capable of being connected selectively to a pressurized-fluid source, characterized in that it possesses : - a brake valve (36; 45) with at least two positions, which is equipped with a control (37; 44) for adjusting its position, - a brake conduit (54-74-73) comprising two portions (54 and 74-73), of which a first portion (54) connects the second main conduit (51, 49) to the brake valve (36; 45) and the second portion (74-73) connects the brake valve (36; 45) to the control device (30, 31) of the independent brake (26, 27), and - a discharge conduit (77) connecting the brake valve (36; 45) to a pressureless discharge tank (25), - of the at least two positions of the brake valve (36; 45), the first position corresponding to the putting in communication of the second portion (74-73) of the brake conduit with the discharge conduit (77) and the second position corresponding to the putting in communication of the first portion (54) and second portion (74-73) of the said brake conduit and to their isolation from the discharge conduit (77), and in that the main fluid distribution device (17-11-10) is equipped with a control (18-19-20) for adjusting its position, whilst there is a means for synchronizing the controls (40-83-42; 43-46) for adjusting the positions of the main fluid distribution device and of the brake valve, this synchronization means (40-83-42; 43-46) ensuring, in response to the configuration in which the main fluid distribution device and the brake valve are placed in their respective first positions, the controls for the subsequent placing of this main fluid distribution device and this brake valve in their respective second positions.