CN2743573Y

CN2743573Y - Variable capacity booster pump

Info

Publication number: CN2743573Y
Application number: CN 200420068070
Authority: CN
Inventors: 韩昌求
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-08
Filing date: 2004-07-08
Publication date: 2005-11-30
Anticipated expiration: 2014-07-08

Abstract

The utility model discloses a variable capacity booster pump used for vehicle brake system. The master pump contains a pump body, on which a hydraulic cylinder and a pressure controlling cylinder are provided; the hydraulic cylinder is controlled via the pressure controlling cylinder, which can cause the fluid quantity needs to be supplied of the output low-pressure brake fluid to be randomly changed as the sizes and the quantities of the branch pumps of each vehicle type, and moreover, the pressure of the high-pressure fluid can be adjusted; therefore, the commonality is good; the variable capacity booster pump can be adapted to all classes of vehicle types; simultaneously the hydraulic cylinder has the major diameter segment and the minor diameter segment; the pressure increasing is visible; consequently, the pedal brake is easiest and labor-saving, and the steering pump is not needed.

Description

The variable boosting pump

Technical field:

The utility model relates to a kind of oil hydraulic pump, especially for the master cylinder of motor vehicle braking system.

Background technique:

The master cylinder that present motor vehicle braking system is used, structure is simpler, and the internal diameter of cylinder is equally big, and piston has only one, during work, by the pin push rod that touches on the brake piston is moved to wheel cylinder provides brake fluid, this master cylinder must carry out different size design according to various vehicle, needs the requirement of liquid measures to reach various different wheel cylinders, thereby interchangeability is poor, and when if master cylinder and wheel cylinder diameter are big, foot-operated often being difficult to of manpower bears a heavy burden, and needs to install boost pump.

The model utility content:

The purpose of this utility model is to provide a kind of interchangeability good, need not to pacify the motor vehicle braking system variable boosting pump of boost pump.

The utility model variable boosting pump comprises an oil hydraulic cylinder and a pressure control cylinder that a pump housing, this pump housing are provided with, wherein:

Oil hydraulic cylinder has a big footpath section, one path section, in the section of big footpath a piston by track bar control is arranged, other has a T type box type piston post, its head is in the section of the big footpath of oil hydraulic cylinder, bar portion stretches in the path section of oil hydraulic cylinder, big footpath chamber, annular cavity, path chamber have been formed between oil hydraulic cylinder and piston and the piston column, big footpath chamber and annular cavity respectively have a spring, the path chamber also is connected with a pressure regulating overflow valve and a safety check, and the brake fluid in the path chamber is exported by pressure regulating overflow valve pressure regulation overflow and by safety check;

Have a pressure control piston, a pressure controlled valve in the pressure control cylinder, this pressure controlled valve has valve pocket, spool, pressure adjusting spring and pressure regulating screw nut, described spool comprises bar portion and head, its king-rod portion is provided with the radial hole at center hole and center hole two ends, the pressure control piston left side is the feed liquor chamber, the right is the pressure control chamber, valve pocket the right of pressure regulator valve is the discharge opeing chamber, have big footpath chamber in an inlet opening one end and the oil hydraulic cylinder to communicate simultaneously on the pump housing and communicate with feed liquor chamber in the pressure control cylinder, the other end is by the one-way valve feed liquor.

Because the utility model has increased a pressure control cylinder on the prior art basis, pressure controlled valve in the pressure control cylinder can be regulated the low pressure brake fluid pressure, when the low pressure brake fluid pressure has arrived setting, the low pressure liquid measure has supplied foot, the outside discharge opeing of discharge opeing chamber of pressure control cylinder at this moment, when brake fluid pressure continues to raise and reaches setting, begin overflow with the pressure regulating overflow valve that links to each other of path chamber, the high hydraulic brake fluid of output is only pressed, to its brake fluid pressure difference that needs of dissimilar cars, this moment, the can regulate pressure regulating overflow valve made the high pressure brake fluid pressure in the path chamber obtain adjusting, to satisfy the needs of all kinds of vehicles.Since the low hydraulic brake fluid of the utility model variable boosting pump output can with the size of each vehicle wheel cylinder and how many change at random the liquid measure that should supply, and the adjustable in pressure of high pressure liquid, therefore versatility is good, testing the result who draws repeatedly through the inventor is: car is divided into Light-duty Vehicle and heavy goods vehicles two classes, the utility model product needs only two kinds and can meet the demands, a kind of general and Light-duty Vehicle, another kind of general and heavy goods vehicles, its braking force is big, and is reliable.Owing to oil hydraulic cylinder of the present utility model big footpath section and path section are arranged in addition, thereby footbrake is easily laborsaving, need not adorn boost pump.

Description of drawings:

Fig. 1 is a main sectional view of the present utility model.

Embodiment:

The utlity model has the pump housing 1 as can be seen from Figure 1, this pump housing bottom is an oil hydraulic cylinder 2, and top is pressure control cylinder 3.

Oil hydraulic cylinder 2 has a big footpath section, one path section, in the section of big footpath a piston 5 by track bar 4 controls is arranged, other has a T type box type piston post 6, its head is in the section of the big footpath of oil hydraulic cylinder 2, bar portion stretches in the path section of oil hydraulic cylinder, formed big footpath chamber 21 between oil hydraulic cylinder 2 and piston 5 and the piston column 6, annular cavity 22, path chamber 23, big footpath chamber 21 and annular cavity 22 respectively have a spring 7, the afterbody of path chamber 23 links to each other with a pressure regulating overflow valve 9 and a safety check 8, when the hydraulic pressure in the path chamber 23 reaches setting, the spool 91 that brake fluid backs down pressure regulating overflow valve makes brake fluid flow out from flow-off 92, safety effect is played in the beginning overflow, when the utility model is used for different vehicles, to the different pressure that can regulate path chamber mesohigh brake fluid by pressure regulating overflow valve 9 of the pressure requirement of brake fluid, export the brake fluid that meets the demands by safety check 8 according to vehicle then.

Have a pressure control piston 31, a pressure controlled valve 34 in the pressure control cylinder 3, this valve has valve pocket 32, spool 33, pressure adjusting spring 35 and pressure regulating screw nut 36, described spool comprises bar portion 37 and head 38, its bar portion is provided with the radial hole 40 at center hole 39 and center hole two ends, pressure control piston 31 left sides are feed liquor chamber 41, and the right is control sap cavity chamber 42, and valve pocket 32 the right of pressure controlled valve are discharge opeing chambers 43, when the low pressure brake fluid pressure arrives setting, discharge from this discharge opeing chamber.The pressore setting of low hydraulic brake fluid is regulated by pressure adjusting spring 35 and pressure regulating screw nut 36 and is determined.

Working procedure of the present utility model is divided into two stages, phase I is earlier for the low hydraulic brake fluid of foot: driver's pin is stepped on brake pushrod 4, piston 5 moves right, liquid in the chamber 21 of the big footpath of compressing is carried to each wheel cylinder through path chamber 23 through the center hole of T type box type piston post 6 earlier again, the car different according to the type that varies in size, it needs liquid measure to have difference, but can both step on brake pushrod by driver's pin realizes, it is push rod stroke difference, this moment, each chamber pressure of oil hydraulic cylinder equated, T type box type piston post 6 transfixions, when fluid pressure reaches certain value, the liquid on the pressure control piston left side makes it to move to right, thereby the spool 33 of pressure regulator valve is moved to right, the radial hole 40 of center spool hole right-hand member enters discharge opeing chamber 43, pressure control liquid in the annular cavity 22 is discharged from, supply high hydraulic brake fluid so enter second stage: piston 5 continues to move to right, chamber 21 constancies of volume of big footpath, annular cavity 22 is discharged pressure control liquid, big footpath chamber 21 raises simultaneously with fluid pressure in the path chamber 23 and equates, carries high hydraulic brake fluid by the path chamber to motor vehicle braking system.

Claims

1, a kind of variable boosting pump comprises the oil hydraulic cylinder (2) that a pump housing (1), this pump housing are provided with, and it is characterized in that also comprising a pressure control cylinder (3), wherein:

Oil hydraulic cylinder (2) has a big footpath section, one path section, in the section of big footpath a piston (5) by track bar (4) control is arranged, other has a T type box type piston post (6), its head is in the section of the big footpath of oil hydraulic cylinder, bar portion stretches in the path section of oil hydraulic cylinder, formed big footpath chamber (21) between oil hydraulic cylinder and piston and the piston column, annular cavity (22), the path chamber, respectively there is a spring (7) big footpath chamber (21) and annular chamber (22) chamber, path chamber (23) also is connected with a pressure regulating overflow valve (9) and a safety check (8), and the brake fluid in the path chamber is by pressure regulating overflow valve (9) pressure regulation overflow and by safety check (8) output;

Has a pressure control piston (31) in the pressure control cylinder (3), one pressure controlled valve (34), this pressure controlled valve has valve pocket (32), spool (33), pressure adjusting spring (35) and pressure regulating screw nut (36), described spool comprises bar portion (37) and head (38), its king-rod portion is provided with the radial hole (40) at center hole and center hole (39) two ends, the pressure control piston left side is feed liquor chamber (41), the right is pressure control chamber (42), the valve pocket of pressure controlled valve (32) the right is discharge opeing chamber (43), have big footpath chamber (21) in an inlet opening (44) one end and the oil hydraulic cylinder (2) to communicate simultaneously on the pump housing and communicate with feed liquor chamber (41) in the pressure control cylinder (3), the other end is by the one-way valve feed liquor.