阅读说明：本技术 一种轨道工程车用走行液压系统 (Walking hydraulic system for rail engineering vehicle ) 是由 曾继萍 杨飞 齐育鹏 李艳妮 胡伟伟 王鹏 钟岳坤 冯建昌 李华伟 张高锋 朱红 于 2021-10-20 设计创作，主要内容包括：提供一种轨道工程车用走行液压系统,属于轨道车技术领域,作业泵的出油口通过管路与换向阀进油口相连,换向阀的出油口通过油管与先导油控制阀组的P1口连通,先导油控制阀组与走行液压马达一、走行液压马达二的变量机构控制油口连接,在整个行车过程中起到控制走行马达变量的作用,先导油控制阀组与走行液压马达一、走行液压马达二的台口连接,用于冲洗走行马达轴承,起到降温延长轴承寿命的作用。本发明不仅可以辅助进行行车制动,稳定车速,保证车辆反拖扭矩不超过发动机承受范围；而且还可以起到降温延长轴承寿命的作用；同时在运行及制动过程中起到控制走行马达变量的作用,增加了走行系统的功能。(The utility model provides a walking hydraulic system for rail engineering vehicle, belong to railcar technical field, the oil-out of operation pump links to each other with the switching-over valve oil inlet through the pipeline, the oil-out of switching-over valve passes through oil pipe and the P1 mouth intercommunication of pilot oil control valves, pilot oil control valves and walk hydraulic motor one, walk the hydraulic motor two variable mechanism control hydraulic fluid port and be connected, play the effect of controlling walking motor variable in whole driving process, pilot oil control valves and walk hydraulic motor one, walk the platform mouth of hydraulic motor two and be connected for washing walking motor bearing, play the effect of cooling extension bearing life. The invention can not only assist the service braking, stabilize the speed, ensure the back-dragging torque of the vehicle not to exceed the bearing range of the engine; but also can play a role in reducing the temperature and prolonging the service life of the bearing; meanwhile, the variable of the running motor is controlled in the running and braking processes, and the function of the running system is added.)

1. The utility model provides a track machineshop car is with walking hydraulic system which characterized in that: the hydraulic control system comprises a hydraulic oil tank (1), an operation pump (2), a first traveling hydraulic pump (3), a second traveling hydraulic pump (4), a reversing valve (5), a pilot oil control valve group (6), a brake valve group (7), a first traveling hydraulic motor (8) and a second traveling hydraulic motor (9); an oil inlet of the operation pump (2) is communicated with the hydraulic oil tank (1) through a pipeline, an oil outlet of the operation pump (2) is connected with an oil inlet of a reversing valve (5) through a pipeline, an oil outlet of the reversing valve (5) is communicated with a port P1 of a pilot oil control valve group (6) through an oil pipe, one path of oil processed by the pilot oil control valve group (6) is connected with variable mechanism control oil ports of a first traveling hydraulic motor (8) and a second traveling hydraulic motor (9) to play a role in controlling the variable of the traveling motors in the whole traveling process, and the other path of oil processed by the pilot oil control valve group (6) is connected with ports G of the first traveling hydraulic motor (8) and the second traveling hydraulic motor (9) to be used for washing the bearings of the traveling motors and playing a role in reducing the temperature and prolonging the service life of the bearings; ports A of the first traveling hydraulic pump (3) and the second traveling hydraulic pump (4) are connected with an port AM1 of the brake valve bank (7) through high-pressure oil pipes, ports B of the first traveling hydraulic pump (3) and the second traveling hydraulic pump (4) are connected with a port BM1 of the brake valve bank (7) through high-pressure oil pipes, and ports AP1 and AP2 and ports BP1 and BP2 of the brake valve bank (7) are connected with a port A and a port B of the first traveling hydraulic motor (8) and the second traveling hydraulic motor (9) through high-pressure oil pipes respectively; the first traveling hydraulic motor (8) and the second traveling hydraulic motor (9) are connected with the axle gear box (11) through the gear engaging device (10).

2. The traveling hydraulic system for a rail-bound work vehicle according to claim 1, characterized in that: the pilot oil control valve group (6) comprises a pressure reducing valve (6-1), a high-pressure oil filter (6-2), an overflow valve (6-3), an energy accumulator (6-4), a two-position two-way electromagnetic switch valve (6-5) and a pressure sensor (6-6); a P1 port of the pilot oil control valve group (6) is communicated with an inlet of a pressure reducing valve (6-1), an outlet of the pressure reducing valve (6-1) is communicated with an inlet of a high-pressure oil filter (6-2), an outlet of the high-pressure oil filter (6-2) is communicated with three oil ports P2, U1 and U2 of the pilot oil control valve group (6), oil of a P2 port of the pilot oil control valve group (6) is connected with variable mechanism control oil ports of a traveling hydraulic motor I (8) and a traveling hydraulic motor II (9), and U1 and U2 ports of the pilot oil control valve group (6) are respectively connected with a G port of the traveling hydraulic motor I (8) and a G port of the traveling hydraulic motor II (9); meanwhile, the outlet of the high-pressure oil filter (6-2) is connected with the inlet of the overflow valve (6-3), when the pressure of the inlet oil exceeds the set pressure value of the overflow valve (6-3), the overflow valve (6-3) is opened to enable the high-pressure oil to be reserved back to the hydraulic oil tank (1) through the outlet of the overflow valve (6-3), the outlet of the high-pressure oil filter (6-2) is simultaneously connected with the inlet of the energy accumulator (6-4) and enables the energy accumulator to be stamped, and when the inlet of the pilot oil control valve group (6) is free of pressure oil, the energy accumulator (6-4) plays a pressure maintaining effect and maintains the variable of a traveling motor; the outlet of the high-pressure oil filter (6-2) is connected with a pressure sensor (6-6) to monitor the pressure of the pilot oil control valve group (6) in real time.

3. The traveling hydraulic system for a track-laying vehicle according to claim 1 or 2, characterized in that: the first traveling hydraulic pump (3), the second traveling hydraulic pump (4), the first traveling hydraulic motor (8) and the second traveling hydraulic motor (9) all adopt an electric proportional variable control structure.

Technical Field

The invention belongs to the technical field of railway vehicles, and particularly relates to a traveling hydraulic system for a railway engineering vehicle.

Background

With the development of large-scale and heavy-duty engineering machinery and the increasingly complex use conditions, the requirements on the traveling speed and accuracy of the traveling driving system of the engineering machinery are higher and higher, and a trend is toward adopting a pump-controlled motor closed loop as the traveling driving system of the engineering machinery. In order to meet the market demand, the key elements for improving the performance of the whole vehicle are to improve the speed, the efficiency and the high precision of a running system. In particular, patent No. CN202010256253.0 discloses a vehicle power system and a railway engineering mechanical vehicle, in which although the technical characteristics of using a hydraulic system to drive a wheel pair to rotate and hydraulically brake the wheel pair in the railway engineering vehicle are disclosed, the service performance of the bearing is greatly affected by high friction temperature during the working process of the traveling motor bearing, thereby reducing the service life of the bearing. There is therefore a need for improvements.

Disclosure of Invention

The technical problems solved by the invention are as follows: the invention provides a traveling hydraulic system for a rail engineering vehicle, which can ensure that the rail engineering vehicle runs at the speed of 80 km/h; the device not only can assist in service braking, stabilize the speed of the vehicle and ensure that the anti-drag torque of the vehicle does not exceed the bearing range of an engine, but also can wash the bearings of the traveling motor, thereby playing the roles of reducing the temperature and prolonging the service life of the bearings; and simultaneously plays a role in controlling the variable of the traveling motor in the running and braking processes.

The technical scheme adopted by the invention is as follows: a traveling hydraulic system for a rail engineering vehicle comprises a hydraulic oil tank, an operation pump, a first traveling hydraulic pump, a second traveling hydraulic pump, a reversing valve, a pilot oil control valve group, a brake valve group, a first traveling hydraulic motor and a second traveling hydraulic motor; an oil inlet of the operation pump is communicated with a hydraulic oil tank through a pipeline, an oil outlet of the operation pump is connected with an oil inlet of a reversing valve through a pipeline, an oil outlet of the reversing valve is communicated with a P1 port of a pilot oil control valve group through an oil pipe, one path of oil processed by the pilot oil control valve group is connected with variable mechanism control oil ports of a traveling hydraulic motor I and a traveling hydraulic motor II to play a role in controlling the variable of the traveling motor in the whole traveling process, and the other path of oil processed by the pilot oil control valve group is connected with a G port of the traveling hydraulic motor I and the traveling hydraulic motor II to be used for washing the bearings of the traveling motor and playing a role in reducing the temperature and prolonging the service life of the bearings; ports A of the first traveling hydraulic pump and the second traveling hydraulic pump are connected with ports AM1 of the brake valve bank through high-pressure oil pipes, ports B of the first traveling hydraulic pump and the second traveling hydraulic pump are connected with ports BM1 of the brake valve bank through high-pressure oil pipes, and ports AP1 and AP2, ports BP1 and ports BP2 of the brake valve bank are connected with ports A and ports B of the first traveling hydraulic motor and the second traveling hydraulic motor through high-pressure oil pipes respectively; the first traveling hydraulic motor and the second traveling hydraulic motor are connected with the axle gear box through the gear engaging device.

The technical scheme is further limited, wherein the pilot oil control valve group comprises a pressure reducing valve, a high-pressure oil filter, an overflow valve, an energy accumulator, a two-position two-way electromagnetic switch valve and a pressure sensor; a P1 port of the pilot oil control valve group is communicated with an inlet of a pressure reducing valve, an outlet of the pressure reducing valve is communicated with an inlet of a high-pressure oil filter, an outlet of the high-pressure oil filter is communicated with three oil ports P2, U1 and U2 of the pilot oil control valve group, oil of the P2 port of the pilot oil control valve group is connected with control oil ports of a variable mechanism of a first traveling hydraulic motor and a second traveling hydraulic motor, and U1 and U2 ports of the pilot oil control valve group are respectively connected with a G port of the first traveling hydraulic motor and a G port of the second traveling hydraulic motor; meanwhile, the outlet of the high-pressure oil filter is connected with the inlet of an overflow valve, when the pressure of inlet pressure oil exceeds the set pressure value of the overflow valve, the overflow valve is opened to enable the high-pressure oil to pass through the outlet of the overflow valve and to be reserved in a hydraulic oil tank, the outlet of the high-pressure oil filter is simultaneously connected with the inlet of an energy accumulator and enables the energy accumulator to be stamped, and when no pressure oil exists at the inlet of the pilot oil control valve group, the energy accumulator plays a pressure maintaining effect and maintains the variable of a traveling motor; and the outlet of the high-pressure oil filter is connected with a pressure sensor to monitor the pressure of the first-come oil control valve group in real time.

In addition, the technical scheme is further limited, and the first traveling hydraulic pump, the second traveling hydraulic pump, the first traveling hydraulic motor and the second traveling hydraulic motor all adopt an electric proportional variable control structure.

Compared with the prior art, the invention has the advantages that:

1. the hydraulic system drives the rail vehicle to run through the hydraulic system, so that the rail engineering vehicle can be ensured to run at the speed of 80 km/h;

2. the brake valve set is arranged in the scheme, so that service braking can be assisted, the speed of the vehicle is stabilized, and the anti-drag torque of the vehicle is ensured not to exceed the bearing range of an engine;

3. the scheme is provided with the pilot oil control valve group, so that the bearings of the traveling motor can be washed, and the effects of reducing the temperature and prolonging the service life of the bearings are achieved; and simultaneously plays a role in controlling the variable of the traveling motor in the running and braking processes.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the engagement of the gear engaging device with the bogie according to the present invention;

FIG. 3 is an internal structural view of a pilot oil control valve assembly according to the present invention;

fig. 4 is a schematic block diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements" does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Referring to fig. 1-4, embodiments of the present invention are described in detail.

A traveling hydraulic system for a railway engineering vehicle comprises a hydraulic oil tank 1, a working pump 2, a traveling hydraulic pump I3, a traveling hydraulic pump II 4, a reversing valve 5, a pilot oil control valve group 6, a brake valve group 7, a traveling hydraulic motor I8 and a traveling hydraulic motor II 9, as shown in figure 1.

The pilot oil control valve group 6 is arranged in the traveling hydraulic system, so that a traveling motor bearing can be washed, and the effects of reducing temperature and prolonging the service life of the bearing are achieved; and simultaneously plays a role in controlling the variable of the traveling motor in the running and braking processes. The concrete connection structure is as follows: an oil inlet of the working pump 2 is communicated with the hydraulic oil tank 1 through a pipeline, high-pressure oil at an oil outlet of the working pump 2 is connected with an oil inlet of a reversing valve 5 through a pipeline, an oil outlet of the reversing valve 5 is communicated with a P1 port of a pilot oil control valve group 6 through an oil pipe, one path of oil processed by the pilot oil control valve group 6 is connected with variable mechanism control oil ports of a traveling hydraulic motor I8 and a traveling hydraulic motor II 9 to play a role in controlling the variable of the traveling motor in the whole traveling process, and the other path of oil processed by the pilot oil control valve group 6 is connected with G ports of the traveling hydraulic motor I8 and the traveling hydraulic motor II 9 to be used for washing the bearings of the traveling motor and playing a role in reducing the temperature and prolonging the service life of the bearings.

Specifically, the internal structure of the pilot oil control valve group 6 is shown in fig. 3, and the pilot oil control valve group 6 comprises a pressure reducing valve 6-1, a high-pressure oil filter 6-2, an overflow valve 6-3, an energy accumulator 6-4, a two-position two-way electromagnetic switch valve 6-5 and a pressure sensor 6-6; the port P1 of the pilot oil control valve group 6 is communicated with the inlet of a pressure reducing valve 6-1, the outlet of the pressure reducing valve 6-1 is communicated with the inlet of a high-pressure oil filter 6-2, the outlet of the high-pressure oil filter 6-2 is communicated with the three oil ports P2, U1 and U2 of the pilot oil control valve group 6, the oil pressure is reduced through the pressure reducing valve 6-1, then the oil is filtered through the high-pressure oil filter 6-2, the oil cleanliness is guaranteed to be above NAS 16387 level, and finally the oil is divided into the three oil ports P2, U1 and U2. The oil liquid at the P2 port of the pilot oil control valve group 6 is connected with the variable mechanism control oil ports of the first traveling hydraulic motor 8 and the second traveling hydraulic motor 9, so that the variable mechanism control oil ports can control the variable of the traveling motors in the whole traveling process, and the U1 and the U2 ports of the pilot oil control valve group 6 are respectively connected with the G ports of the first traveling hydraulic motor 8 and the second traveling hydraulic motor 9, so that the traveling motor bearings are washed, and the effects of reducing the temperature and prolonging the service life of the bearings are achieved.

The outlet of the high-pressure oil filter 6-2 is connected with the inlet of the overflow valve 6-3, when the pressure of inlet oil exceeds the set pressure value of the overflow valve 6-3, the overflow valve 6-3 is opened, and high-pressure oil is reserved back to the hydraulic oil tank through the outlet of the overflow valve 6-3; the overflow valve 6-3 is a safety valve, and the pressure of the system is protected from exceeding the pressure resistance value of the shell of the traveling motor. The outlet of the high-pressure oil filter 6-2 is simultaneously connected with the inlet of the energy accumulator 6-4, so that the energy accumulator is stamped, and when no pressure oil exists at the inlet of the pilot oil control valve group 6, the energy accumulator 6-4 plays a pressure maintaining effect and maintains the variable of the traveling motor; the accumulator 6-4 serves as an auxiliary power source to provide a certain amount of pressurized oil for controlling the motor variables. The outlet of the high-pressure oil filter 6-2 is connected with the pressure sensor 6-6, the pressure of the first-come oil control valve group 6 is monitored in real time, and the pressure sensor 6-6 has the functions of system self-diagnosis and fault alarm.

The traveling hydraulic system is provided with a brake valve group 7, so that service braking can be assisted, the speed of the vehicle is stabilized, and the anti-dragging torque of the vehicle is ensured not to exceed the bearing range of an engine. The brake valve group 7 is integrated with a high-pressure ball valve 7-1, so that oil paths of a fault traveling pump and a fault traveling motor can be cut off, and the vehicle can still continue to travel. The high-speed traveling hydraulic system is characterized in that two traveling motors are driven by adopting double-pump confluence. The specific connection structure is as follows: the oil of the A ports of the first traveling hydraulic pump 3 and the second traveling hydraulic pump 4 is gathered and then is connected with the AM1 port of the brake valve group 7 through high-pressure oil pipes, the oil of the B ports of the first traveling hydraulic pump 3 and the second traveling hydraulic pump 4 is gathered and then is connected with the BM1 port of the brake valve group 7 through high-pressure oil pipes, and the oil of the AP1 port and the AP2 port of the brake valve group 7 and the oil of the BP1 port and the oil of the BP2 port are respectively connected with the A port and the B port of the first traveling hydraulic motor 8 and the second traveling hydraulic motor 9 through high-pressure oil pipes.

The first traveling hydraulic motor 8 and the second traveling hydraulic motor 9 are connected with an axle gear box 11 through a gear engaging device 10, as shown in fig. 2. When the engaging device 10 is in the engaging position, the traveling hydraulic system outputs power to the axle gear box 11, and when the engaging device 10 is in the disengaging position, the traveling hydraulic system does not output power to the axle gear box 11.

The first traveling hydraulic pump 3, the second traveling hydraulic pump 4, the first traveling hydraulic motor 8 and the second traveling hydraulic motor 9 all adopt an electric proportional variable control valve structure, and stepless regulation of the vehicle speed can be realized by changing the displacement of the pumps and the motors.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.