CN201771014U

CN201771014U - Tire type hydraulic excavator traveling automatic speed changing device

Info

Publication number: CN201771014U
Application number: CN2010202814637U
Authority: CN
Inventors: 仲英维; 王健; 高山铁; 夏强; 刘鑫
Original assignee: Guizhou Jonyang Kinetics Co Ltd
Current assignee: Guizhou Jonyang Kinetics Co Ltd
Priority date: 2010-08-04
Filing date: 2010-08-04
Publication date: 2011-03-23
Anticipated expiration: 2020-08-04

Abstract

The utility model discloses a tire type hydraulic excavator traveling automatic speed changing device, which belongs to a speed changing device and comprises a hydraulic motor and a main pump. The main pump (1) is communicated with a main valve (6), oil openings a of two valve blocks are connected in parallel prior to being communicated with an oil opening of a rear axle hydraulic motor (12) and an oil opening of a double-speed valve (15), an oil opening of the front axle hydraulic motor (13) is communicated with the oil opening of the double-speed valve (15), a hydraulic control end of the double-speed valve is communicated with a gear shifting valve (8), two steering valves (9) are communicated with hydraulic control ends of the front axle valve block (5) and the rear axle valve block (10), oil openings c and d of the two valve blocks, a middle oil opening of the double-speed valve (15), oil releasing openings of the two hydraulic motors, the steering valve (9) and the gear shifting valve (8) are communicated with an oil tank (7), and pressure sensors (2) arranged on two oil outlet pipes of the main pump (1) are respectively electrically connected with an electromagnetic end of the gear shifting valve (8). The speed changing device has the advantages of short gear shifting response time and fine cross-country capacity.

Description

Travelling automatic transmission of hydraulic wheel excavator

Technical field: the utility model relates to a kind of hydraulic crawler excavator walking speed change gear, relates in particular to a kind of hydraulic wheel excavator double motor walking automatic transimission.

Background technology: at present, the walking speed change gear of hydraulic wheel excavator is to be made of the front propeller shaft that drives propons and back axle respectively and the inter-axle shaft that are fixed on the gearbox on the chassis, the hydraulic motor that is connected with this gearbox and draw from gearbox mostly; Its shortcoming is gearbox designs complexity, gearshift slow motion, therefore not only influences the rideability of vehicle by complicated location, and maintenance is also relatively more difficult.

Summary of the invention: at the above-mentioned defective that exists in the prior art, the utility model aims to provide a kind of dispense with parking gearshift and short travelling automatic transmission of hydraulic wheel excavator of gearshift time.

To achieve these goals, the utility model is by the following technical solutions: it comprises hydraulic motor and main pump, be provided with propons valve piece and back axle valve piece in the main valve, main pump is communicated with the e hydraulic fluid port of this two valves piece respectively by the oil duct that is located in the main valve, be communicated with the A hydraulic fluid port and the double speed valve lower end left oil port of back axle hydraulic motor respectively after a hydraulic fluid port parallel connection of two described valve pieces, be communicated with the B hydraulic fluid port and the double speed valve lower end right oil port of back axle hydraulic motor respectively after the b hydraulic fluid port parallel connection of two described valve pieces, the A of propons hydraulic motor, B hydraulic fluid port are communicated with two hydraulic fluid ports of double speed valve upper end respectively; The hydraulic control end of double speed valve is communicated with the oil-out of shift valve, and the actuator port of two reversal valves is communicated with the hydraulic control end of propons valve piece, back axle valve piece respectively; The middle road binders mouth of the drain tap of the c hydraulic fluid port of two described valve pieces and d hydraulic fluid port, two described hydraulic motors, double speed valve, the drain tap of reversal valve and the drain tap of shift valve are communicated with fuel tank respectively; The pressure sensor that is located at respectively on main pump two flowlines is electrically connected with the electromagnetism end of shift valve.

Be provided with decompressor between described two flowlines of main pump, this decompressor constitutes by being serially connected in two one way valves between two flowlines and the reducing valve that this two one way valve is communicated with fuel tank.

Compared with the prior art, the utility model is owing to adopted technique scheme, therefore vehicle is in the process by complicated location, can regulate the discharge capacity of main pump automatically by pressure sensor and the platform number of the hydraulic motor of working according to the variation of load, realize the vehicle to run automatic stepless speed change; In addition, owing to omitted complicated gearbox, thereby increased the distance on chassis and ground, thus strengthened the cross-country ability of vehicle.The utlity model has simple in structure, easy to operate, be convenient to plurality of advantages such as maintenance, dispense with parking gearshift, gearshift response time be short.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structure for amplifying schematic diagram of the forward and backward bridge hydraulic motor in the utility model;

Fig. 3 is the shift valve in the utility model, the structure for amplifying schematic diagram of reversal valve.

Among the figure: main pump 1 pressure sensor 2 one way valves 3 reducing valve 4 propons valve pieces 5 main valves 6 fuel tanks 7 shift valves 8 reversal valves 9 back axle valve pieces 10 back axles 11 back axle hydraulic motors 12 propons hydraulic motors 13 propons 14 double speed valves 15

The specific embodiment: the utility model is described in further detail below in conjunction with accompanying drawing and specific embodiment:

In Fig. 1～3, be provided with propons valve piece 5 and back axle valve piece 10 in the main valve 6, this propons valve piece and back axle valve piece are three six logical pilot operated valve device; Main pump 1 is the duplex variable pump.Two flowlines of main pump 1 are communicated with the e hydraulic fluid port of propons valve piece 5, back axle valve piece 10 separately by the oil duct that is located in the main valve 6 respectively, be communicated with the A hydraulic fluid port of back axle hydraulic motor 12, the left oil port of double speed valve 15 lower ends by oil pipe respectively after a hydraulic fluid port parallel connection of propons valve piece 5, back axle valve piece 10, be communicated with the B hydraulic fluid port of back axle hydraulic motor 12, the right oil port of double speed valve 15 lower ends by oil pipe respectively after the b hydraulic fluid port parallel connection of propons valve piece 5, back axle valve piece 10, the A of propons hydraulic motor 13, B hydraulic fluid port are communicated with by two hydraulic fluid ports of oil pipe with double speed valve 15 upper ends respectively; The hydraulic control end of double speed valve 15 is communicated with the oil-out of shift valve 8, and the actuator port of two reversal valves 9 is communicated with (not shown) by oil pipe with the hydraulic control end of propons valve piece 5, back axle valve piece 10 respectively; The drain tap of the middle road binders mouth of the drain tap of the c hydraulic fluid port of the c hydraulic fluid port of propons valve piece 5 and d hydraulic fluid port, back axle valve piece 10 and d hydraulic fluid port, back axle hydraulic motor 12, the drain tap of propons hydraulic motor 13, double speed valve 15, the drain tap of reversal valve 9 and shift valve 8 is communicated with fuel tank 7 by oil pipe respectively; The pressure sensor 2 that is located at respectively on 1 liang of flowline of main pump is connected with the electromagnetism end of shift valve 8 by controller.Back axle hydraulic motor 12 by shaft coupling be connected with back axle 11, propons hydraulic motor 13 is connected with propons 14 by shaft coupling.Damage because of hypertonia for fear of main valve 6, between two flowlines of main pump 1, be provided with decompressor; This decompressor is made of with the reducing valve 4 that two one way valves, the 3 outlets other end in parallel is communicated with fuel tank 7 two one way valves 3, the end that are serially connected between described two flowlines.

Operating principle: when the vehicle high-speed forward was travelled, double speed valve 15 (two five-way valves) was in right position, and propons valve piece 5 and back axle valve piece 10 all are in upper.At this moment, because double speed valve 15 has cut off the working oil path of propons hydraulic motor 13, the a hydraulic fluid port of the pressure oil that main pump 1 provides by propons valve piece 5 and back axle valve piece 10 is jointly to the fuel feeding of back axle hydraulic motor 12, pressure oil enters, flows out from the B hydraulic fluid port through the A hydraulic fluid port from back axle hydraulic motor 12, and b, the d hydraulic fluid port of process propons valve piece 5 and back axle valve piece 10 flow back to fuel tank 7 respectively then; Therefore have only the 12 forward work of back axle hydraulic motor, propons hydraulic motor 13 is not worked.The middle road binders mouth of double speed valve 15 is communicated with fuel tank 7, not only can prevent that propons hydraulic motor 13 from inhaling empty, but also the required hydraulic oil of the above-mentioned hydraulic motor of balance.

When vehicle is in climbing state, because the tractive force that needs requires to increase, the flow of main pump 1 increases with tractive force and reduces, hydraulic system working pressure increases, pressure sensor 2 is converted into the electromagnetism end of passing to shift valve 8 behind the signal of telecommunication with the pressure signal that collects by controller, shift valve 8 switches to hydraulic control end the next and connection double speed valve 15, and double speed valve 15 switches to position, a left side (bottom gear) and the working oil path of connection propons hydraulic motor 13; At this moment, propons valve piece 5 and back axle valve piece 10 still are in upper, the pressure oil that main pump 1 provides passes through double speed valve 15 to propons hydraulic motor 13 fuel feeding by fuel feeding, another road of a hydraulic fluid port one road direction back axle hydraulic motor 12 of propons valve piece 5 and back axle valve piece 10, back axle hydraulic motor 12, propons hydraulic motor 13 are worked simultaneously, and vehicle is climbed up the slope smoothly because of tractive force increases.After vehicle is climbed up the slope, because the tractive force that needs requires to reduce, the flow of main pump 1 reduces with tractive force and increases, hydraulic system working pressure reduces, pressure sensor 2 is gathered less than pressure signal, shift valve 8 switches to upper, and double speed valve 15 returns to right position (top gear) and cuts off propons hydraulic motor 13 working oil path again; So the speed of a motor vehicle is run at high speed again.

Be in when the next when reversal valve 9 drives propons valve pieces 5 and back axle valve piece 10, the b hydraulic fluid port of the pressure oil that main pump 1 provides by propons valve piece 5 and back axle valve piece 10 to back axle hydraulic motor 12 or (with) propons hydraulic motor 13 fuel feeding; At this moment, pressure oil through from back axle hydraulic motor 12 or (with) the B hydraulic fluid port of propons hydraulic motor 13 enters, flows out from the A hydraulic fluid port, flows back to fuel tank 7 through a, the d hydraulic fluid port of propons valve piece 5 and back axle valve piece 10 respectively then; Vehicle falls back and travels.

When propons valve piece 5 and back axle valve piece 10 still were in meta, the pressure oil that main pump 1 provides directly flowed back to fuel tank 7 through the C hydraulic fluid port of propons valve piece 5 and back axle valve piece 10, and vehicle is in neutral gear position.

Claims

1. travelling automatic transmission of hydraulic wheel excavator, comprise hydraulic motor and main pump, it is characterized in that: be provided with propons valve piece (5) and back axle valve piece (10) in the main valve (6), main pump (1) is communicated with the e hydraulic fluid port of this two valves piece respectively by the oil duct that is located in the main valve (6), be communicated with the A hydraulic fluid port and double speed valve (15) the lower end left oil port of back axle hydraulic motor (12) respectively after a hydraulic fluid port parallel connection of two described valve pieces, be communicated with the A of propons hydraulic motor (13) with the B hydraulic fluid port and double speed valve (15) the lower end right oil port of back axle hydraulic motor (12) respectively after the b hydraulic fluid port parallel connection of two described valve pieces, the B hydraulic fluid port is communicated with two hydraulic fluid ports of double speed valve (15) upper end respectively; The hydraulic control end of double speed valve (15) is communicated with the oil-out of shift valve (8), and the actuator port of two reversal valves (9) is communicated with the hydraulic control end of propons valve piece (5), back axle valve piece (10) respectively; The drain tap of the middle road binders mouth of the drain tap of the c hydraulic fluid port of two described valve pieces and d hydraulic fluid port, two described hydraulic motors, double speed valve (15), the drain tap of reversal valve (9) and shift valve (8) is communicated with fuel tank (7) respectively; The pressure sensor (2) that is located at respectively on main pump (1) two flowline is electrically connected with the electromagnetism end of shift valve (8).

2. travelling automatic transmission of hydraulic wheel excavator according to claim 1, it is characterized in that: be provided with decompressor between described two flowlines of main pump (1), this decompressor is by reducing valve (4) formation that is serially connected in two one way valves (3) between two flowlines and this two one way valve is communicated with fuel tank (7).