CN201082710Y

CN201082710Y - Brake master cylinder

Info

Publication number: CN201082710Y
Application number: CNU2007201138438U
Authority: CN
Inventors: 张柏青
Original assignee: 张柏青
Current assignee: Ningbo Anjie Brake Co., Ltd.
Priority date: 2007-08-28
Filing date: 2007-08-28
Publication date: 2008-07-09
Anticipated expiration: 2017-08-28

Abstract

The utility model relates to a brake master cylinder, which comprises a master brake cylinder body. A first piston assembly and a second piston assembly, and an outlet opening distributed on the cylinder body and connected with the front wheels and the rear wheels are distributed in the brake master cylinder body, and an oil cup assembly is connected between the front cavity and the back cavity of a brake valve cylinder. The utility model is characterized in that a connector on the outlet opening is connected with a proportioning valve. The structure is simple and reasonable, the delivery pressure of the brake valve can be adjusted, and the security is enhanced.

Description

A kind of master brake cylinder

Technical field

The utility model relates to a kind of master brake cylinder.

Background technology

The dynamic brake valve can reduce the strength of stretcher by hydraulic booster, and obtains bigger lock torque, thereby alleviates operator's labour intensity,, is widely used on a lot of automobiles or construction machinery and equipment for this reason.

Brake equipment as schematically shown in Figure 3, wherein master brake cylinder can suitably distribute the brake power of front and back wheel, because rear lock causes the vehicle get out of hand, on the brake system of miniature car, be widely used when preventing owing to emergency braking, turn inside diameter.

As the patent No. is that 02275292.7 Chinese patent, 98246256.5 Chinese patent have also been reported similar brake activation valve, but, their brake activation valve cylinder body outlet connectors still are traditional general joint, disproportional valve, can't adjust the hydraulic pressure of output, make the characteristic curve that the brake-pressure of front and back wheel braking mechanism can not the simulate ideal state, reduced the safety of braking, require further improvement design.

The utility model content

Technical problem to be solved in the utility model provide a kind of simple and reasonable, can adjust the brake activation valve delivery pressure, improve the master brake cylinder of safety.

The technical scheme that the utility model solve the technical problem employing is: a kind of master brake cylinder, it includes master cylinder body, be provided with in the master cylinder body and be distributed with the first piston assembly and second piston assembly, and be distributed in the outlet that cylinder body gets on to connect front-wheel or rear wheel brake mechanism, be connected with the lubricating cup assembly between the ante-chamber of brake activation valve cylinder body and the back cavity, it is characterized in that described outlet top connection installation is connected with apportioning valve.

Further improve, described apportioning valve is the valve body of proportional valve of being threaded on the outlet connector, valve seat again has been threaded on valve body, be built-in with spool between valve seat and the valve body, have the through hole that the outlet with the outlet of joint and valve seat is communicated with in the spool, simultaneously, the spool inner end has step surface, spool top and step surface cooperate with centre hole in the valve body, be supported with spring between spool and the valve interior wall, the valve end cavity is provided with damping plug and cooperates with the spool top, and the sealing surface between valve body and valve seat and valve seat and the spool is provided with sealing member, and it is simple and practical, assemble easy to use, and can regulate the hydraulic pressure of output, the actual braking characteristics curve that makes master brake cylinder improves the reliability and the safety of work as far as possible near desirable braking characteristics curve.

The described first piston assembly and second piston assembly are connected in series by spring and spring perch.

Compared with prior art, advantage of the present utility model is: owing on the outlet connector of brake cylinder casing apportioning valve is installed, pass through screw connection structure, can adjust the delivery pressure of master brake cylinder, thereby adjust the braking strength of trailing wheel, the actual braking characteristics curve that makes master brake cylinder is as far as possible near desirable braking characteristics curve, guaranteed maximum braking effect, the reliability of raising work and safety, structural manufacturing process realize that easily cost is not high, simple in structure, volume is little, can use on the brake system of roadlice widely, solves the big problem of safety.

Description of drawings

Fig. 1 is the structure cutaway view of master brake cylinder of the present utility model;

Fig. 2 is an apportioning valve structure cutaway view on the joint of the present utility model;

Fig. 3 is the connection diagram of master brake cylinder;

Fig. 4 is the performance diagram of load sensing valve.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As Fig. 1,2 signals, a kind of master brake cylinder, it includes master cylinder body 1, master cylinder body 1 is divided into ante-chamber 1a and back cavity 1b, ante-chamber and back cavity connect into single-piece cylinder body 1, be provided with the first piston assembly 2 and second piston assembly 3 in the ante-chamber of master cylinder body 1 and the back cavity respectively, the first piston assembly 2 and second piston assembly 3 are that serial connection couples together by spring perch and support spring 4, simultaneously, be distributed with the outlet 5 that connects the front-wheel braking mechanism and the outlet 6 of rear wheel brake mechanism on the cylinder body 1, the first piston assembly 2 and second piston assembly 3 after compressing by spring 4 are exported the braking liquid in the pressure chamber, incompressibility because of braking liquid, so set up hydraulic pressure in brake circuit, brake fluid pressure remakes with wheel cylinder in the drg or brake clamp and makes its work, realizes braking thereby play the locking wheel.See Fig. 3, be connected with lubricating cup assembly 7 between the ante-chamber of brake activation valve cylinder body and the back cavity, the master brake cylinder structure that these are traditional, master brake cylinder can suitably be distributed the brake power of front and back wheel, prevent since emergency braking, turn inside diameter the time because rear lock causes the vehicle get out of hand, these principles and structure are just no longer in depth launched to be described here, see also relevant traditional product and document.Crucial part of the present invention is to export top connection 9 and also installs and be connected with apportioning valve 8, make it can adjust the delivery pressure of master brake cylinder according to the needs of reality braking, apportioning valve 8 concrete structures are the valve bodies 10 of proportional valve of being threaded on the joint 9 of brake outlet port, be lined with sealing member 11 on the sealing surface between the valve body 10 of apportioning valve and the joint 9, it generally is the O RunddichtringO, valve seat 12 also has been threaded on the valve body 10 of apportioning valve, cavity between valve seat 12 and the valve body 10 is built-in with spool 13, have through hole in the spool 13, the outlet of joint 9 and the outlet of valve seat 12 are communicated with, simultaneously, spool 13 inner ends have step surface, top 14 and step surface in the spool can be cooperated with the centre hole 15 in the valve body, be supported with spring 16 between spool 13 and valve body 10 inwalls, valve body 10 end cavitys are provided with damping plug 17 and cooperate with spool top 14, also be provided with sealing member 18 as the O RunddichtringO on the sealing surface between spool 13 and the valve seat 12, so just constituted apportioning valve 8, when the delivery pressure of master brake cylinder is in than lower-order section, because spool 13 two ends areas are in different size, cause in the apportioning valve, top 14 in the spool withstands on 15 li of centre holes in the valve body, step surface is being fitted on valve body 10 inner ends, and damping plug 17 stops spool top 14 part through holes, so, only rely on the partial cross section through hole that has in the spool 13, the outlet of joint 9 and the outlet of valve seat 12 are communicated with, apportioning valve output is with smaller ratio output hydraulic pressure, being linear increases, and after having crossed flex point, the delivery pressure of master brake cylinder is in and compares higher stage, because spool 13 pressure at two ends are in different size, cause in the apportioning valve, the top 14 that spool is 13 li is promoted by hydraulic coupling, be separated from damping plug 17, the through hole in 14 whole cross sections, spool top is communicated with the outlet of joint 9 and the outlet of valve seat 12, apportioning valve output is with bigger ratio output hydraulic pressure, also being linear increases, as long as suitable regulating valve seat 12, initial tension of spring amount between regulating spool 13 and the valve seat 12, flex point is occurred in place, the actual braking characteristics curve that makes master brake cylinder is as far as possible near desirable braking characteristics curve, thereby improve the reliability and the safety of work, realize effectively braking, see Fig. 4, wherein 1 is ideal brake force characteristic curve under the full load conditions; The 2nd, the braking force characteristic curve that is provided with under the full load conditions; 3 under idle condition the ideal brake force characteristic curve; 4 '-the braking force characteristic curve that is provided with under the idle condition; 5 ' be break; Pf is a front wheel brake power; Pf is a rear-wheel braking force.

Claims

1. master brake cylinder, it includes master cylinder body, be provided with in the master cylinder body and be distributed with the first piston assembly and second piston assembly, and be distributed in the outlet that cylinder body gets on to connect front-wheel or rear wheel brake mechanism, be connected with the lubricating cup assembly between the ante-chamber of brake activation valve cylinder body and the back cavity, it is characterized in that described outlet top connection installation is connected with apportioning valve.

2. master brake cylinder according to claim 1, it is characterized in that described apportioning valve is the valve body of proportional valve of being threaded on the outlet connector, valve seat again has been threaded on valve body, be built-in with spool between valve seat and the valve body, have the through hole that the outlet with the outlet of joint and valve seat is communicated with in the spool, simultaneously, the spool inner end has step surface, spool top and step surface cooperate with centre hole in the valve body, be supported with spring between spool and the valve interior wall, the valve end cavity is provided with damping plug and cooperates with the spool top, and the sealing surface between valve body and valve seat and valve seat and the spool is provided with sealing member.

3. master brake cylinder according to claim 1 and 2 is characterized in that the described first piston assembly and second piston assembly are connected in series by spring and spring perch.