Bulk transport vehicle hydraulic transmission

 

(57) Abstract:

Usage: in General engineering is applied to small-sized tractors and other transport vehicles to drive propulsion. The inventive source of recharge volume hydraulic transmission uses a hydraulic accumulator, with the working cavity which is communicated to the outlet of the drain hose to the pump and the hydraulic motor and the input of hydroline recharge. Hydraulic accumulator contains a spring-loaded piston associated with the control handle charging, the working volume of the hydraulic accumulator communicated with hydroline recharge through check valve in series with which the filter is installed parallel to the free output. The output of the drain hose is in communication with the working space of the hydraulic accumulator through a hole in the piston, and the entrance of hydroline recharge communicated with the working cavity of the hydraulic accumulator through a hole in its bottom. 2 C.p. f-crystals, 1 Il.

The invention relates to mechanical engineering and is intended for use on compact tractors and other transport vehicles to drive propulsion.

Known volumetric hydraulic transmission vehicles (prototype) having a power circuit with her fluids [1] cooling system, purification and recharge uses an auxiliary pump, Sipper working fluid through the filter and then into the management system displacement of the pump and through the check valves in hydroline low pressure power path, creating the necessary pressure feed from the hydraulic machines (usually in the range of 0.4 to 1.5 MPa). Excess fluid flow auxiliary pump is not spent on the management and compensation of leakage through a special valve goes into the body of the hydraulic transmission, then, mingling with leaks, flows into the cooling radiator and the reservoir, where again climbs auxiliary pump.

Auxiliary pump degrades the energy characteristics of the drive due to power loss on the transfer liquid and on the throttle the excess water in the tank.

The invention aims to improve energy performance volume hydraulic transmission.

This is achieved by the fact that as a source of recharge used hydraulic accumulator, with the working cavity which is communicated to the outlet of the drain hose and the inlet of hydroline recharge.

In addition, the accumulator contains a spring-loaded piston associated with rumely check valve, consistently with which the filter is installed parallel to the free output.

In addition, the output of the drain hose is in communication with the working space of the hydraulic accumulator through a hole in the piston, and the entrance of hydroline recharge communicated with the working cavity of hydroaccumulator through the hole in its bottom.

The specified technical solution can be implemented in connection with the fact that the number of vehicles (in particular, small-sized agricultural tractors) are required to solve the problem of cooling volume hydraulic transmission with auxiliary pump recharge. It is defined as a relatively low intensity modes of loading of the hydraulic transmission, and cooling of hydraulic machines by direct blowing ambient air. These circumstances allow us to abandon the intensive mass transfer between the cavities of the hydraulic transmission and hydraulic tank, limiting the system recharge only compensation internal leakage of the pump and the hydraulic motor. In addition, note that for small tractors used pumps small working volume, not using servo-hydraulic mechanisms change the feed rate and does not require the mA volume hydraulic transmission.

Volumetric hydraulic transmission includes a pump 1 and the hydraulic motor 2, the message of the power hose 3 and 4. In the power hydroline included safety valves 5 and 6. Volumetric hydraulic transmission has hydroline 7 recharge, the output of which is connected with a power hose 3 and 4 through the check valves 8 and 9, and the entrance is in communication with the working space of the hydraulic accumulator 10 through the hole in her bottom. In the hydroline 7 recharge consistently, there are additional non-return valve 11 and the filter 12. In parallel with additional non-return valve 11 has an open port 13 with a check valve 14. The output of the drain hose 15 of the pump 1 and the hydraulic motor 2 flexible sleeve 16 is in communication with the bore 17 in the spring loaded piston 18 of the hydraulic accumulator. The piston 18 is connected with the arm 19 of the charging of the hydraulic accumulator.

Volumetric hydraulic transmission works as follows.

Open port 13 through the check valve 14 is a fuel hose (not shown) is connected to the vessel with the working fluid. By pulling the handle 19 of the piston 18, compressing the spring, means in the upper position (the handle 19 occupies the position indicated by the dotted line). The fluid sucked from the tank fills the working cavity hydroaccumulators flow through the filter 12. After disconnecting the refueling hose turns on pump 1 and is the drive of the hydraulic motor 2 through the power hydroline 3 and 4. In the event of an overload relief valves 5 and 6 perform the bypass fluid from the high pressure power hydroline in low-pressure.

Internal leakage of hydraulic machines via drain hose 15 and the flexible sleeve 16 are received in the hole 17 of the piston 18 and later in the upper part of the working cavity of the accumulator 10. From the lower part of the working cavity of the accumulator 10, the working fluid in the hydroline 7 recharge through the filter 12 under the pressure created by the spring accumulator flows through the check valves 8 or 9 in the corresponding power (low-pressure) hydroline.

Supply of the working fluid in the upper zone of the working cavity of the hydraulic accumulator, and transport it from the bottom area allows you to provide the mass transfer in the accumulator and further use of heat transfer for cooling of the hydraulic transmission.

The frequency of charging of the hydraulic accumulator is determined by the ratio of its working volume and value of the external leakage of the hydraulic transmission. Given the insignificance of the latter in proper hydraulic transmission, to meet the requirement of the ora.

From the above it follows that this volume hydraulic transmission allows you to minimize the power losses in the system recharge, to provide the necessary pressure feeding and cleaning of the working fluid and, in addition, allows to mechanize the charging of the hydraulic transmission fluid without the use of special filling devices.

1. Volumetric hydraulic transmission transport machines, mainly small-sized tractor, containing the pump and the hydraulic motor drive propulsion, drainage hydroline, power hydroline and communicated with them through the check valves of hydroline recharge, characterized in that the source of recharge is a hydraulic accumulator, with the working cavity which is communicated to the outlet of the drain hose and the inlet of hydroline recharge.

2. Hydraulic transmission under item 1, wherein the accumulator comprises a spring-loaded piston associated with the control handle charging, the working volume of the hydraulic accumulator communicated with hydroline recharge through check valve in series with which the filter is installed and parallel to the free output.

3. Hydraulic transmission for PP. 1 and 2, characterized in that the connection of the drain hose with Raben with the working cavity of the hydraulic accumulator through a hole in its bottom.

 

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