CN2036225U - Double circuit braking system with vacuum booster - Google Patents

Abstract

The utility model relates to a double circuit braking system with a vacuum booster, comprising a cylinder body, a plunger, a conical spring, a disk spring, a sliding sleeve, a vacuum valve, an air valve, an oil cup, etc.; the vacuum booster adopts the disk spring and the sliding sleeve structure, and the initial elastic force of the back spring arranged in a master cylinder oil reservoir is larger than the initial elastic force of the front spring; a screw is provided for spacing. Compared with the like hydraulic braking system, the utility model has the advantages of high reliability, convenient operation, low cost, convenient operation; no master cylinder is needed, the pipe joints are a few, and the braking is sensitive; the double circuit braking system with a vacuum booster is suitable for the braking system of the automobile.

Description

Double circuit braking system with vacuum booster

The utility model belongs to the brake system of car technical field, is a kind of double-circuit braking system with vacuum booster.

In recent years, in order to improve running safety, in Hydraulic braking system, extensively adopt the double circuit hydraulic braking system that has vacuum booster, " automobile construction " volume two, teaching and research room writes by the Jilin Industry University automobile, and the piston of the vacuum booster of the dual circuit brake system of introduction and piston rod are directly fixing, and piston and piston rod move simultaneously.When vacuum servo was arranged, piston played the power-assisted effect, and during no vacuum servo, piston need overcome the frictional force between piston and cylinder body, the inertial force of the elastic force of return spring and piston, spring.Thereby make piston play the obstruction braking action.In addition, the plunger return spring in two oil pockets of connecting in the main pump is a free state, does not have any restriction, and during brake, two chambeies, front and back are almost simultaneously fuel-displaced, the brake less stable.

The purpose of this utility model be to provide a kind of easy to use, simple in structure, braking effect is good, the double-circuit braking system of band vacuum booster.

The purpose of this utility model is achieved in that the utility model is made up of parts such as cylinder body, sliding sleeve, volute spring, belleville spring, vacuum valve, Air valves, big piston, pushing rod sleeve, lubricating cup, the pump housing, plug screw, preceding spring, back spring, preceding plunger, back-plunger, leather cup, spools.Rear cylinder seat has filter screen in the hole, and its both sides are fixed with snap ring.Sliding sleeve is arranged in the cylinder body, the pushing rod sleeve that has axial taper hole is housed in the sliding sleeve, the Air valves bar of Air valves and trough of belt, the Air valves bar is fixed with screw by vacuum valve, and an end of Air valves bar is the push rod of total pump plunger.One end of sliding sleeve leans against on the snap ring, and the other end of sliding sleeve leans against on the belleville spring.The belleville spring inner plane is a ring, and excircle has the wing of three inclinations, and a side exterior edge face of belleville spring leans against on the big piston screw rod cover front-end face, and interior edge face leans against on the front-end face of sliding sleeve; The opposite side inner plane leans against on the vacuum valve load dish, and is fixed on the vacuum valve with nut, and big piston is fixed on screw rod with nut and puts, and makes between big piston and casing wall with big leather cup to seal.The big end of big volute spring withstands on the big piston, goes into the bottom that end withstands on cylinder body.Connect in former and later two chambeies of master cylinder, all there are filler opening and oil outlet in each chamber, and filler opening is communicated with lubricating cup, the wheel cylinder of the break of bridge before and after oil outlet is communicated with respectively, two different springs of initial elastic force are arranged in two chambeies of master cylinder, the initial elastic force of back spring is slightly larger than preceding spring, and back spring coil number is more, and rigidity is slightly less than preceding spring, back spring has stop screw and block seat spacing, screw screws in the plunger, and the series connection two-chamber master cylinder is connected with bolt with vacuum booster, and with imitating the circle sealing.Owing to adopt said structure, so have reliable operation, easy to use, advantage that cost is low.

Describe structure of the present utility model and operating process in detail below in conjunction with accompanying drawing:

Fig. 1 is a structural drawing of the present utility model.

Fig. 2 is the A-A sectional drawing of Fig. 1.

Fig. 3 is the utility model belleville spring planimetric map.

Fig. 4 is the B-B sectional drawing of Fig. 3.

With reference to Fig. 1～4, in the cylinder body 1 back seat hole of the utility model vacuum booster filter screen 9 is arranged, its both sides are fixing with snap ring 10, and sliding sleeve 12 is arranged in the cylinder body 1, and the Air valves bar 6 of the pushing rod sleeve 13, Air valves 7 and the trough of belt that have axial taper hole is housed in the sliding sleeve 12.Air valves bar 6 is fixing by vacuum valve 24 usefulness nuts 27, and an end of Air valves bar 6 is push rods of total pump plunger, and an end of sliding sleeve 12 is by ending on snap ring 10, and the other end of sliding sleeve 12 leans against on the belleville spring 23.Belleville spring 23 inner planes are ring, and excircle has the wing of three inclinations, and a side exterior edge face of belleville spring 23 leans against on the front-end face of screw rod cover 22 of big piston 19, and interior edge face leans against on the front-end face of sliding sleeve 12.The opposite side inner plane leans against on the load dish of vacuum valve 24 and is fixed on the vacuum valve 24 with nut 27, and the elastic force of belleville spring 23 can make vacuum valve 24 unlatchings and Air valves 7 close.Simultaneously, belleville spring 23 plays a leverage again, by the effect of belleville spring 23, the thrust of big piston 19 and the thrust of brake petal is synthesized, and promotes the plunger 46 of master cylinder jointly, finishes the braking task.Big piston 19 usefulness nuts 21 are fixed on the screw rod cover 22, big leather cup 18 is used for sealing between big piston 19 and casing wall, vacuum reservoir is divided into former and later two chambeies, the big end of big volute spring 58 withstands on the big piston 19, small end withstands on the bottom of cylinder body 1, and its elastic force makes big piston 19 returns, makes big piston 19 lean against an end of cylinder cap 2, the series connection two-chamber master cylinder is connected with bolt 59 with vacuum booster, and seals with O shape cushion rubber 57.Connect in former and later two chambeies of master cylinder, all there are filler opening and oil outlet in each chamber, and filler opening is communicated with lubricating cup 28,29.Oil outlet leads to the wheel cylinder of front and back bridge break respectively, makes full car braking line be divided into two independent loops, becomes double-circuit braking system.The rigidity of two springs and initial elastic force are different in master cylinder two chambeies, and back spring 43 has screw 44 and block seat 42 restrictions, and screw 44 screws in the plunger 46, and spring 37 before spring 43 number of turns, rigidity are slightly less than thereafter can make the first active chamber oil pressure raise earlier so on the one hand.Oil outlet is earlier fuel-displaced, makes the slightly preferential braking of propons break, before and after can making again in the break braking oil pressure suitable substantially, the stability of automobile when improving braking improves braking effect.

The following describes working procedure of the present utility model, during engine running, the one-way valve 55 that is connected with admission line is inhaled to be opened, the driver is brake-apply not as yet, Air valves 7 is closed, and vacuum valve 24 is opened, and ante-chamber and back cavity are communicated with, two chambeies all produce certain degree of vacuum, and big piston 19 leans against the rear end of cylinder body 1 under the effect of big volute spring.In the automobile running way, when the driver depresses brake petal, braking mandril promotes sliding sleeve 12 reaches, push down belleville spring 23 interior edge faces, belleville spring 23 compressive deformations, prop up on the front-end face of screw rod cover 22 exterior edge face of belleville spring 23, and belleville spring 23 opposite side inner planes lean against on the load dish of vacuum valve 24, promotes the master cylinder plunger advancement.When pedaling force reached certain certain degree, vacuum valve 24 was closed.Then, Air valves 7 is opened, air enters in the back cavity by suction port air passageways 13, big piston 19 is under the effect of forward and backward two cavity pressure differences, the elastic force that has overcome big volute spring 58 moves forward, and the front end of screw rod cover 22 promotes belleville spring 23 exterior edge faces, and sliding sleeve 12 promotes the interior edge face of belleville spring 23, the two pushes away total pump plunger 38 jointly advances, and has increased braking force.When brake petal was parked in a certain position, big piston 19 slightly advanced one section, and Air valves 7 is closed, push rod places the equilibrium position, it is certain that braking force keeps, and big piston 19 is parked on the corresponding position, when brake pedal force increases again, sliding sleeve 12 moves forward once more, Air valves 7 is opened, and back cavity pressure increases again, and big piston 19 pressure at two ends differences increase, big piston moves forward again, power-assisted is bigger, and until reaching a new equilibrium position, air intake valve is closed again, when driver's pin lifts, brake pedal force is zero, moves behind the sliding sleeve 12, and Air valves 7 is closed, vacuum valve 24 is opened then, air in the back cavity is sucked out, and big piston 19 pressure at two ends differences descend, and big piston 19 is under big volute spring 58 effects of return, total pump piston retreats under the effect of spring and return pressure, brake off.The ante-chamber of vacuum booster pump is through one-way valve and start the suction tude normal open, and when engine running, ante-chamber is a vacuum.Back cavity has a degree of vacuum when not braking, when the vacuum power-assisted worked, the air intake valve of back cavity was opened, logical atmosphere.Air intake valve aperture size is with the pedaling force size variation, and pedaling force increases, and belleville spring 23 distortion increase, and the aperture of Air valves just strengthens, and the back cavity aeration quantity just increases, and the power that big piston 19 promotes plunger just increases.

The utility model and similar hydraulic braking servo-system relatively reliable operation, easy to use, cost is low, this system needn't be equipped with a cover master cylinder, pipe coupling is less, when in the brake circuit air being arranged, only venting get final product at the wheel cylinder place, uses very convenient.Vacuum booster is directly controlled by brake petal, and braking is sensitive reliable.Each serial number name is as follows in the accompanying drawing: 1 cylinder body, 2 cylinder caps, 3 sealing gaskets, 4 seal rings, 5 cushion rubbers, 6 Air valves bars, 7 Air valvess, 8 back seats, 9 nets, 10 snap rings, 11 packing rings, 12 sliding sleeves, 13 pushing rod sleeves, 14 nuts, 15 bolts, 16 packing rings, 17 clips, 18 big leather cups, 19 big pistons, 20 packing rings, 21 nuts, 22 screw rod covers, 23 belleville springs, 24 vacuum valves, 25 retaining pads, 26 nuts, 27 lubricating cups, 28 lubricating cups, 29 oil cup caps, 30 lubricating cups lining lid, 32 swivel nuts, 33 rubber cushions, 34 pump housings, 35 copper packings, 36 plug screws, spring before 37,38 plungers, 39 pads, 40 leather cups, 41 catch, 42 spring block seats, 43 back springs, 44 screws, 45 back-up rings, 46 plungers, 47 plain cushions, 48 leather cups, 49O shape circle, 50 snap rings, 51 nonreturn valve cores, 52 packing rings, 53 valve seats, 54 volute springs, 55 spools, 56 rubber cushions, 57O shape cushion rubber, 58 big volute springs, 59 bolts, 60 nuts, 61 spring washers.

Claims (1)

1, a kind of double-circuit braking system with vacuum booster, it is made up of cylinder body, piston, volute spring, lubricating cup, the pump housing, preceding spring, back spring, it is characterized in that sliding sleeve is arranged in cylinder body, tape spool is housed in the sliding sleeve to be leaned against on the snap ring to the Air valves bar of pushing rod sleeve, Air valves and the trough of belt of taper hole, an end of sliding sleeve, the other end of sliding sleeve leans against on the belleville spring, the belleville spring inner plane is a ring, excircle has three oblique just wings, one side exterior edge face of belleville spring leans against on the front-end face of screw rod cover of big piston, and interior edge face leans against on the front-end face of sliding sleeve; The opposite side inner plane leans against on the load dish of vacuum valve, and the initial elastic force of the preceding spring of initial elasticity rate of back spring is big in two chambeies of master cylinder, and back spring has stop screw.

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