CN205327050U - Full hydraulic brake valve - Google Patents

Abstract

The utility model relates to a full hydraulic brake valve belongs to the hydraulic braking field. This full hydraulic brake valve includes valve body, lower valve body, footboard, spacer, support, goes up case, O type circle, bottom spool, last case and bottom spool linkage design, cooperate through the design rim of the mouth, upward the case diameter is greater than preferred being of diameter ratio xi of bottom spool, upper and lower case: 1 xi 1.3, make upper and lower case can not satisfy effective transmission pressure again because of the uneven separation of internal force. It is the same that upper and lower case seals oily length, ensures that the case opening time is the same, does benefit to before improving the loader, the distribution of rear axle brake force, improves the braking security. Support and last case between design the steel ball. Take embedded ball hole design between support and steel ball and the case, footboard, compression spring and support pass through steel ball by -pass roll wheel pressure, pressure that the steel ball can transmit through slight adjusting spring of endwise slip and support, the burden of case on lightening.

Description

A kind of Full hydraulic brake valve

Technical field

This utility model relates to a kind of Full hydraulic brake valve, particularly relates to two-way hydraulic brake valve, belongs to hydraulic braking field。

Background technology

The quality of wheeled loader braking ability, directly affects the work efficiency of complete machine, is more related to the safety of the person and machine。The structure of mechanical loader braking system and operation principle, be all very necessary to maintenance and use。

The Full hydraulic brake valve that current domestic loader uses there is problems in that

1, upper and lower valve core diameter is identical, due to internal force balance, easily occurs the situation that upper and lower spool separates during braking。The diameter of upper valve core and bottom spool, than needing controlling in certain scope, could guarantee when upper and lower spool moves within the scope of the pedal pressing force required, meets and namely occurs without braking and separate, can effectively realize again most powerful situation。

2, existing Full hydraulic brake valve, roller compression spring is by bearing and the straight surfaces brought into contact of spool, but it is time often because of spring-compressed, the applanation of bearing transmission is uneven, cause that bearing is unbalanced with the contact forces of spool, spool and valve opening there will be slight lack of balance resistance, affect braking effect。

For these problems, this utility model, upper and lower valve core diameter ratio is made that and further determines, and the contact surface of bearing Yu spool is made that improvement。

Utility model content

Occur that spool separates for preventing upper and lower spool from moving, and solve the uneven of the transmission of contact traction between spring fastening and spool, reduce spool and move frictional resistance, improve braking safety, this utility model has made following improvement, to regulate the internal force balance of brake valve, and solve when compressing spring-compressed, the harmonious problem of bearing and spool contact traction。

Technical solutions of the utility model are as follows: a kind of Full hydraulic brake valve, including spring B, bearing under described spring B, it is arranged with at described bearing, the upper valve body of lower linkage design and lower valve body, described upper valve body is outside equipped with sheath, described upper valve body is internally installed upper valve core, described lower valve inner is provided with bottom spool, described upper valve core and bottom spool are respectively provided with an annular groove, the height of described annular groove and pressure input, the distance between distance and pressure output and oil-out between delivery outlet all adapts, described bottom spool lower end is provided with spring A, it is characterized in that: described upper valve core diameter is more than the diameter of bottom spool, the diameter of described upper valve core and bottom spool is 1 < ξ < 1.3 than ξ, between described bearing and upper valve core, steel ball is set。

Upper and lower valve core diameter described in the technical solution of the utility model is calculated as follows than ξ:

(1) pedal moment is calculated as follows:

M_Pedal-Y=F_Pedal*cosα*L₁

Wherein M_{Pedal-Y is}The pedal calculated and the moment of the arm of force, F_PedalFor set pedal force, take maximum F herein_Pedal=400N, α are rotational angle during pedal brake, take maximum angle α=15 °, L herein₁For the pedal force center distance to pedal hinge, L herein₁=0.115m。

Substitute into above-mentioned formula

M_Pedal-Y=400*COS15 ° of * 0.115=42.92N M。

(2) spring force calculates

F_Spring=K*X_V

Wherein K is spring rate, herein K=150N/mm, X_VFor spring-compressed distance, herein X_V=4.3mm

Substitute into above-mentioned formula,

F_Spring=150*4.3=645N

(3) upper and lower spool calculation of balance force

P is the brake pressure of accumulator, herein P=6.9Mpa；D₁For upper valve core diameter, d₂For bottom spool diameter, herein d₁=15.9mm, d₂Numerical value is to be calculated。

Substitute into above-mentioned formula:

(4) upper and lower valve core diameter calculates than ξ

Balance according to power draws M_Pedal-Y=(F_Spring+F_Spool)*L₂

Wherein L₂For the step roller distance to pedal hinge, universal experience valueL in cause formula before₁Value 0.115m, herein L₂Value is 0.0356m。

Equation of equilibrium according to power draws:

$42.92=\{6.9*3.14*\left(\frac{15.9*15.9-{d_2}^2}{4}\right)+645\}*0.0356$

D is calculated according to above formula₂=12.25mm, it is known that d1=15.9mm。Take under the designing requirement of maximum in pedal force, ξ=d₁/d₂=1.298 ≈ 1.3。

Consider internal balance power, d₁Need to more than d₂, then show that upper and lower valve core diameter is than ξ scope: 1 < ξ < 1.3。Then two spools keep linkage, when upper and lower valve core diameter ranges for 1 < ξ < 1.3 than ξ, may insure that when braking supercharging, upper and lower spool will not separate because of interior force unbalance, can meet again and effectively transmit pressure, reach most powerful requirement。

The technical solution of the utility model also includes: described upper valve core is identical with bottom spool Oil sealing length。Guarantee that the spool opening time is identical, be beneficial to the distribution improving the forward and backward bridge brake force of loader, improve braking safety。

The technical solution of the utility model also includes: described upper valve body design rim of the mouth, and upper valve body coordinates by designing rim of the mouth with lower valve body, can be positioned by rim of the mouth, improve the accuracy of assembling, reduce assembly difficulty during valve body assembling。

The technical solution of the utility model also includes: described bearing takes embedded ball to design with steel ball and upper valve core。Pedal, compression spring transmit roller pressure with bearing by steel ball, and steel ball can pass through to slide axially and slightly adjust the pressure that spring transmits with bearing, alleviates the burden of upper valve core。

The technical solution of the utility model also includes, and devises guide ring, star circle and dust ring between described sheath and valve body successively, solves guiding and slides easy to wear and seal bad problem。

Accompanying drawing explanation

Fig. 1 is double loop Full hydraulic brake valve structural representation。

Fig. 2 is double loop Full hydraulic brake valve system structure schematic diagram。

Fig. 3 is that upper and lower valve body rim of the mouth coordinates and sealing means schematic diagram。

Fig. 4 is upper valve core oil sealing position view。

Fig. 5 is bottom spool oil sealing position view。

Fig. 6 is embedded steel ball design structural representation。

In figure, 1, plug screw, 2, spring A, 3, lower valve body, 4 upper valve bodies, 5, back-up ring, 6, pad, 7, fixed support, 8, bolt, 9, sheath, 10, roller, 11, pedal, 12, short pin shaft, 13, long pin shaft, 14, spacer, 15, spring B, 16, dust ring, 17, star is enclosed, 18, guide ring, 19, spring C, 20, spring D, 21, bearing, 22, steel ball, 23, partition, 24, upper valve core, 25, O, 26, bottom spool, 27, accumulator, 28, wheel cylinder, T1, oil return opening, T2, oil return opening, P1, pressure introduction port, P2, pressure introduction port, A1, pressure output, A2, pressure output, h1, feedback oilhole, h2, feedback oilhole, A, the Oil sealing length of the logical wheel cylinder of pressure introduction port in upper valve core, B, the Oil sealing length of the logical wheel cylinder of pressure introduction port in bottom spool, C, the Oil sealing length of the logical oil return opening of pressure output in upper valve core, D, the Oil sealing length of the logical oil return opening of the pressure output of bottom spool。

Detailed description of the invention

By the examples below and in conjunction with accompanying drawing this utility model is described further。

A kind of Full hydraulic brake valve, including spring B 15, bearing 21 under described spring B 15, it is arranged with at described bearing 21, the upper valve body 4 of lower linkage design and lower valve body 3, described upper valve body 4 is outside equipped with sheath 9, described upper valve body 4 is internal exists upper valve core 24, described lower valve body 3 is internal exists bottom spool 26, described upper valve core 24 is respectively provided with an annular groove with bottom spool 26, the height of described annular groove and pressure input, the distance between distance and pressure output and oil-out between delivery outlet all adapts, described bottom spool 26 lower end is provided with spring A2, described upper valve core 24 diameter is more than the diameter of bottom spool 26, the diameter of described upper valve core 24 and bottom spool 26 is 1 < ξ < 1.3 than ξ, between described bearing 21 and upper valve core 24, steel ball 22 is set, as shown in Figure 1。

Full hydraulic brake valve described in technical solutions of the utility model, specific works process is as follows: when needs are braked, pedal 11 promotes upper valve core 24 to move down via spring B 15, upper valve core 24 hydraulic power produced promotes bottom spool 26 to move down simultaneously, and two spools are first shut off oil return inlet T 1, T2。, then accumulator 27 pressure introduction port P1, P2 are connected with pressure output A1, A2 of output to wheel cylinder；The pressure acting on two spool lower ends via two spools feedback oilhole h1, h2 also constantly raises。Promote spool to move upward and cut off accumulator 27 pressure introduction port P1, P2 and output to wheel cylinder 28 pressure output A1, A2 between connection, now spool continues to keep brake pressure, and the balance of pedal 11 and brake pressure determines the size of brake pressure。When braking procedure terminates, upper and lower spool return makes pressure output A1, A2 and oil return inlet T 1, T2 reclose, and P1, P2 mouth, because of the movement of spool, is re-closing off, as shown in Figure 2。

Upper valve body 4 designs rim of the mouth, can be positioned by rim of the mouth, improve the accuracy of assembling, reduce assembly difficulty during valve body assembling。Upper and lower valve body carries out Butt sealing by O 25 simultaneously, such as Fig. 3。

It addition, shown by Fig. 2, the pressure input channel of accumulator 27 pressure output channel of the present utility model and wheel cylinder 28 is arranged vertically, not in the same plane。

In upper valve core 24 described in the utility model, the Oil sealing length B length of the logical wheel cylinder 28 of Oil sealing length A and pressure introduction port P2 in bottom spool 26 of the logical wheel cylinder 28 of pressure introduction port P1 is identical；After starting braking, the Oil sealing length C of the logical oil return inlet T 1 of pressure output A1 in upper valve core 24, equivalently-sized with the Oil sealing length D of the logical oil return inlet T 2 of the pressure output A2 of bottom spool 26, referring specifically to Fig. 4 and Fig. 5。

Bearing described in the technical solution of the utility model takes embedded ball to design with steel ball and upper valve core, such as Fig. 6。Pedal, compression spring transmit roller pressure with bearing by steel ball, and steel ball can pass through to slide axially and slightly adjust the pressure that spring transmits with bearing, alleviates the burden of upper valve core。

The above; it it is only preferred embodiment of the present utility model; not this utility model is done any pro forma restriction, all within spirit of the present utility model and principle, is made any amendment, equivalent replacement and improvement etc., should be included within protection domain of the present utility model。

Claims (5)

1. a Full hydraulic brake valve, including spring B (15), bearing (21) under described spring B (15), it is arranged with at described bearing (21), the upper valve body (4) of lower linkage design and lower valve body (3), described upper valve body (4) is outside equipped with sheath (9), described upper valve body (4) is internally installed upper valve core (24), described lower valve body (3) is internally installed bottom spool (26), described upper valve core (24) and bottom spool (26) are respectively provided with an annular groove, the height of described annular groove and pressure input, the distance between distance and pressure output and oil-out between delivery outlet all adapts, described bottom spool (26) lower end is provided with spring A(2), it is characterized in that: described upper valve core (24) diameter is more than the diameter of bottom spool (26), the diameter of described upper valve core (24) and bottom spool (26) is 1 < ξ < 1.3 than ξ, steel ball (22) is set between described bearing (21) and upper valve core (24)。

2. a kind of Full hydraulic brake valve as claimed in claim 1, it is characterised in that: described upper valve core (24) is identical with bottom spool (26) Oil sealing length。

3. a kind of Full hydraulic brake valve as claimed in claim 2, it is characterised in that: described upper valve body (4) coordinates by designing rim of the mouth with lower valve body (3)。

4. a kind of Full hydraulic brake valve as described in as arbitrary in claims 1 to 3, it is characterised in that: described bearing (21) takes embedded ball to design with steel ball (22) and upper valve core (24)。

5. a kind of Full hydraulic brake valve as claimed in claim 4, it is characterised in that: devise guide ring (18), star circle (17) and dust ring (16) between described sheath (9) and valve body successively。