CN2715490Y

CN2715490Y - Pressure distributor of wheel tractor

Info

Publication number: CN2715490Y
Application number: CN 200420011292
Authority: CN
Inventors: 吴锡璋; 吴琦; 吴振斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-16
Filing date: 2004-07-16
Publication date: 2005-08-10
Anticipated expiration: 2014-07-16

Abstract

A pressure distributor of wheel tractor applied to the high or medium power wheel tractor of the utility model, comprises a casing, a spill valve, a system safety valve, a main control valve, a descending speed adjusting valve, an oil cylinder safety valve, a one-way valve, etc. Under the premise of not changing the size of the tractor pressure distributor produced by the existing introduced technique, the technical measures of large pyramidal face spill valve and changing the method that the main control valve controls the spill valve are adopted to largely increase the functional reliability of this pressure distributor comparing to the distributor produced by the technology of Fiat, and the spill valve can not easily jam. The structure of the distributor is simplified and the number of the parts is reduce, in particular, the casing oil channels are manufactured by machine simplifing the casing casting technique and processing technique, which reduces the manufacture cost of the distributor and provides with convenient maintenance. This pressure distributor can be used to develop a novel high or medium power wheel tractor lifting device in the country to perfect the function, and can also be used to replace the tractor pressure distributor produced by the prior introduced technique.

Description

The wheel tractor pressure distributor

(1) technical field: the utility model belongs to the tractor field, relates to a kind of big, middle power wheeled tractor pressure distributor.

(2) background technology: at present, the pressure distributor big, that middle power wheeled tractor uses that China is 44～88 kilowatts has two types basically, and a kind of is exploitation 70～eighties of last century, is come by the improvement of small-power wheel tractor pressure distributor.Because it is less that the tractor lifter function of use of the type distributor is installed, control performance is simpler, is difficult to adapt to the instructions for use of existing big, middle power wheeled tractor; Another kind is to introduce the pressure distributor that Italian Fiat technology is produced, the tractor lifter function that the type distributor is installed is more perfect, its distributor adopts the adjustable partial discharge control technology of sensitivity, so it is better to regulate control performance, can satisfy instructions for use big, middle power wheeled tractor.But this dispensing arrangement is complicated, the technological requirement height, and manufacturing cost is higher.And the work oil cleanliness is had relatively high expectations, and oil return valve easily produces clamping stagnation.It is very inconvenient that this distributor keeps in repair the maintenance of oil return valve especially simultaneously.

(3) summary of the invention: the purpose of this utility model is to provide a kind of functional reliability good, simple in structure, and cost is lower, and is easy to maintenance, can satisfy full flow big, the middle power wheeled tractor instructions for use and regulate pressure distributor.The technical solution of the utility model is: the wheel tractor pressure distributor is mainly by housing, oil return valve, the security of system valve, main control valve, the decrease speed control valve, compositions such as oil cylinder safety valve and check valve, do not change the appearance and size of the tractor hydraulic distributor of the existing production of introducing technology, the big conical surface oil return valve of differential type is installed in the oil return valve pocket, change main control valve control oil return valve mode, the oil cylinder safety valve adopts low capacity Direct Action Type cone valve, the decrease speed control valve adopts handwheel to regulate ball valve, the security of system valve adopts the slit damping Direct Action Type cone valve of independent component, and the housing internal oil channel forms by machining.

The utility model wheel tractor pressure distributor adopts the good effect that produces after the technique scheme to be: (1) functional reliability increases.Because the big conical surface oil return valve of differential type substitutes sleeve valve formula oil return valve in the prior art, its power of closing is greatly increased, so oil return valve is difficult for clamping stagnation; The slit damp type cone valve that adopts independent component is as security of system valve, favorable working performance; Housing adopts the processing oil duct, and the oil duct cleannes are greatly increased, and the distributor functional reliability is increased.(2) designs simplification, component number reduces, and simplifies technology, reduces cost.Because the improvement of dispensing arrangement makes part number and Fiat's product reduce 30% approximately, and make processing technology simplify the especially processing of oil return valve; Housing adopts the processing oil duct to replace the casting oil duct of prior art, can greatly reduce the housing percent defective, has reduced cost; The employing of low capacity oil cylinder safety valve and ball-valve type decrease speed control valve also makes dispensing arrangement simplify, and part reduces.(3) easy to maintenance.Distributor is if the oil return valve fault occurs, need not resemble the prior art from the lifter dismounting down distributor keep in repair, stop up and only need outside machine, to turn on oil return valve, but just maintenance platoon removes, and does not destroy any adjustment of lifter.(4) the utility model distributor not only can substitute mutually with Fiat's like product, and because it has adorned a security of system valve more, so when this distributor is used for transforming at present homemade undesirable big, middle power wheeled tractor lifter, can make the structure of lifter simpler.

(4) description of drawings:

Fig. 1 is the utility model wheel tractor pressure distributor vertical view;

Fig. 2 is the utility model wheel tractor pressure distributor A-A profile;

Fig. 3 is the utility model wheel tractor pressure distributor B-B profile;

Fig. 4 is the utility model wheel tractor pressure distributor asphalt principle figure.

(5) embodiment: by Fig. 2 and shown in Figure 3, this pressure distributor mainly transfers valve 5, oil cylinder safety valve 6, check valve 7 etc. to form by housing 1, oil return valve 2, security of system valve 3, main control valve 4, decrease speed.The main control valve that has valve pocket 4 that pairing is chosen is loaded onto O-ring seals and back-up ring earlier, pack into from the distributor body 1 top then main control valve pocket of distributor body, until that main control valve pocket shoulder and housing shoulder are collided is spacing, refill the obstruction of main spool spring and main valve; The oil return valve 2 that pairing the is chosen housing oil return valve pocket of packing into refills return spring and oil return valve and stops up; Pack into the opposite of oil return valve 2 of the security of system valve 3 that adjusted is good; The then ball valve of decrease speed control valve 5 and the return spring housing 1 of packing into, the oil cylinder safety valve 6 that the adjusted of screwing on then is good is screwed into the regulating valve stem that has O-ring seals and handwheel from the distributor end face again, refills back-up ring; Last unidirectional valve seat threading that earlier will the band O-ring seals is screwed on the check valve delivery connection after putting into check valve 7 and one-way valve spring and spring base.When distributor was used for substituting the product of prior art Fiat technology production, security of system valve 3 can not adorned, and changes this valve into obstruction and gets final product.The utility model distributor can be realized descending, neutral, three kinds of functions of lifting.

1) descend and outwards to move under its return spring effect when main control valve 4, the fluid among the oil cylinder T is closed check valve 7 and is flowed to fuel tank 0 by the port for drawdown that decrease speed is regulated ball valve 5 and main control valve 4, and farm implements descend.This moment, main control valve 4 was linked up the fluid and the fuel tank 0 in oil return valve 2 back of the body chambeies, and oil pump comes oily P just to back down oil return valve 2 inflow fuel tanks 0, oil pump off-load.

2) neutrality is moved inward by down position when main control valve 4 overcomes return spring power, closes up to the main control valve port for drawdown, and the fluid among the oil cylinder T is cut off, and farm implements just maintain static.This moment main control valve 4 will oil return valve the fluid in 2 back of the body chambeies link up with fuel tank 0, oil pump comes oily P still to back down oil return valve 2 inflow fuel tanks 0, oil pump off-load.

3) promote when main control valve 4 and continued to move inward by the neutral position, the main control valve port for drawdown continues to close.This moment, main control valve 4 came oily P to introduce oil return valve back of the body chamber in oil pump.Oil return valve 2 just cuts out under the effect of hydraulic oil, because the hydraulic action area in oil return valve back of the body chamber is greater than the ante-chamber area, so, oil return valve 2 is added return spring power under the action of hydraulic force that differential area produced effect is closed oil return valve 2, the next oily P of oil pump this moment just backs down check valve 7 and enters among the oil cylinder T, and farm implements are promoted.

The logical pasta that can change 5 declines of decrease speed adjusting ball valve with handwheel is long-pending, thus the decrease speed of control farm implements.When the handwheel inhour withdrawed from, decrease speed was regulated ball valve 5 and is taken a seat, and just can be used as hydraulic lock, and farm implements are fixed motionless.

Claims

1, a kind of being used for greatly, the pressure distributor of middle power wheeled tractor, mainly by housing, oil return valve, the security of system valve, main control valve, the decrease speed control valve, compositions such as oil cylinder safety valve and check valve, it is characterized in that: the appearance and size that does not change the tractor hydraulic distributor of the existing production of introducing technology, the big conical surface oil return valve of differential type is installed in the oil return valve pocket, change main control valve control oil return valve mode, the oil cylinder safety valve adopts low capacity Direct Action Type cone valve, the decrease speed control valve adopts handwheel to regulate ball valve, the security of system valve adopts the slit damping Direct Action Type cone valve of independent component, and the housing internal oil channel forms by machining.