AXIAL-PISTON PUMP AND VEHICLE HYDRAULIC TRANSMISSION WITH AXIAL- PISTON PUMP Russian patent published in 2001 - IPC

FIELD: transport engineering; vehicle transmissions. SUBSTANCE: invention is designed for use in vehicle transmission as transfer member between fluid and inertial accumulator of mechanical energy. Axial- piston pump is furnished with device to provide its operation as motor. This device is hydraulically coupled with third line 3/3 of distributor, with piston space of first hydraulic cylinder and with drain main line. This device is essentially a controllable check valve adapted for free passage of fluid medium flow from piston space of first hydraulic cylinder into third line 3/3 of distributor. It has control line and restrictor installed in distributor third line 3/3 and third hydraulic cylinder in space of which spring-loaded piston is installed for movement. Piston divides space into piston and spring chambers. Spring chamber communicates with drain main line, and piston chamber, with check valve control line which is connected with distributor third line 3/3 through restrictor. Piston space of second hydraulic cylinder communicates with pump pressure main line by means of distributor line 2/3. Plunger space communicates with drain main line by means of constant-section restrictor, and with pump pressure line by means of variable-section restrictor. Variable-capacity hydraulic machine in vehicle hydraulic transmission is essentially axial-piston pump described above whose drain main line communicates with drain, and pressure main line, with pressure main line of constant-capacity pump and, through shutoff, with inlet main line of second hydraulic machine. Its outlet main line communicates through check valve with pressure main line of constant - capacity pump. Drain main line of axial-piston pump or constant- capacity pump communicates through check valve with inlet main line of second hydraulic machine. It communicates also through controlled check valve with outlet main line of second hydraulic machine, while control line of controlled check valve communicates with pressure main line of constant - capacity pump through two-position three-line distributor communicating with drain. EFFECT: provision of operation of pump as motor, increased volumetric efficiency of transmission at reduced metal usage. 5 cl, 4 dwg