CN2346646Y - Low pressure air boosting hydraulic brake driving gear - Google Patents

Abstract

The utility model provides a hydraulic break driving gear which can directly produce brake by pedal effort and can produce boosting action by low-pressure air, comprising an air shutoff valve, an air booster, a brake master cylinder and a wheel braking cylinder. Lower air pressure which (0.2 to 0.3 Mpa) can be easily obtained due to the boosting action acts on the maximum braking pedal effort, and both hydraulic braking signals and pedal travel braking signals are provided simultaneously, so that labor intensity for drivers can be relieved, and the safety for driving and braking can be increased.

Description

Low-pressure air booster type hydraulic braking driving device

The utility model relates to the dual circuit booster type brake transsmission device of domestic and international small and medium-sized car, particularly a kind of low-pressure air booster type hydraulic braking driving device.

Small and medium-sized car sets up power-assisted dress power apparatus, as vacuum servo formula and vacuum pressure charged etc. for the brake pedal force that reduces chaufeur improves braking force in the hydraulic braking driving device at present.Because the vacuum pressure difference is generally 0.075-0.05MPa (being difficult to reach 0.1MPa), so power-assisted is less.In order to obtain bigger power-assisted effect, do servo-unit (diaphragm) greatlyyer usually.Obtaining vacuum in engine petrol is easier to, diesel motor is carried out because of no vacuum source (field) then needs addition of vacuum equipment, as vacuum pump and electrical generator are combined into one, or directly drive vacuum pump (as EQ1061 type car) by bent axle and produce vacuum source.Use air-assisted formula structure in heavy motor vehicle, its pressure reaches 0.45-0.6MPa, this structure is used acquire a certain degree of difficulty on small and medium-sized car, and low pressure air source and vacuum source are similar to be easier to realization and establish.

The purpose of this utility model then is the problem that exists at above-mentioned prior art, providing a kind of makes the certain brake fluid pressure of master brake cylinder (hydraulic pressure) generation export front and back brake wheel cylinder generation braking to earlier by the pedal brake pedal, then by low-pressure gas source (0.2-0.3MPa) input air servo-unit, produce the low-pressure air booster type hydraulic braking driving device that the thrust bigger than pedal force promotes master brake cylinder.

Technical solution of the present utility model:

A kind of automobile double pipeline hydraulic brake low-pressure air booster type hydraulic braking driving device is characterized in that:

A, this device valve body (left side) 3, valve body (right side) 9 sealed by threaded connection, valve body (left side) 3 has knock hole Φ 6, intake interface Z1, valve body (right side) 9 right sides have the bolt 11 on four holes and the housing 12 to be connected and to seal through nut 10, also have breather pipe 8 sealings to link, and hole Φ 1 who communicates with atmosphere, multistage trapezoidal push rod 38 is by valve body 3,9 inner chambers, sealed at both ends with valve body, the spring 5 of inner chamber, 34,35 make air inlet valve 4, blow off valve 7 is in respectively closes and opening, be B, C, the D chamber communicates with atmosphere, and push rod 38 upper stop pieces 2 make the running light conducting with switch (left side) 1 simultaneously, and push rod 38 has dust protecting cap 36 with valve body (left side) 3;

B, these device left and right sides housing 12,17 linking portion flange are linked through bolt 11, nut 10 by anchor ear 16, housing two inner end surfaces in the left and right sides are welded with bolt 11 respectively, the left shell linking portion is sealing, the porose sealing with pipeline 8 links on the left shell, the bolt 18 that right shell body 17 has a screw and adjustment piston 13 strokes to use cooperates by nut 10 lockings, inner chamber has piston 13, pull back spring 15, and piston 13 and inner walls are for being sealed and matched;

C, this device valve body 23 has 2 knock hole Φ 6, left end has four holes and housing 17 bolts to link through nut 10, there are three oil-feed interface Z2 the valve body top, Z3, Z4 links with oil-storing cup by the road, Z3 wherein, fuel feed hole Φ 3 is respectively arranged in the Z4 mouth, there are 2 output interface Z6 compensation orifice Φ 2 belows, Z7 links through delivery valve and front and back brake piping, left end cap 24 is linked by thread seal with valve body, end cap interface Z5 and hydraulic efficiency pressure switch link, inner chamber has piston 31,27,22, push rod 28, pull back spring 25,26, the location snap ring 21 of piston 22, piston 27 right projections have groove width to be H4 deeply and communicate with medium pore Φ 5, in its right-hand member Z8 interface delivery valve is housed, piston 31,27,22 cooperate with valve interior wall leather package are housed, and opening is towards improving in order to sealing property to the right.

The utlity model has following advantage:

1, do the time spent losing power-assisted, pedal force still directly the delivery pressure braking liquid produce braking;

2, by adjusting the piston stroke of booster piston forced stroke modulated pressure brake activation valve, reach the purpose that output brake fluid pressure (braking force) changes;

3, brake activation valve is provided with three oil suction chambers and links to each other with oil-storing cup, produces with brake off all more steady;

4, except that fluid control speed-slackening signal (switch), being provided with two groups, to control the speed-slackening signal of driving, braking and the tailstock in the operator's compartment by pedal (push rod) stroke synchronous, and service brake is safer;

5, low-pressure air is easy to obtain from additional air pump (machinery or electronic), and structure and cost and vacuum pump are similar, also can obtain from the waste gas (through cooling and purifying treatment) of energy brake;

6, general part simple in structure is many, produces and uses with easy to maintenance, is suitable for the servo link of small and medium-sized car, and the particularly suitable diesel-engined vehicle also can be used for heavy motor vehicle, but pressure and sealing property will improve.

Fig. 1 is a cutaway view of the present utility model.

The utility model will be further described below in conjunction with accompanying drawing:

This device is made of integrated low-pressure air control cock, servo-unit and two-chamber braking main valve with three oil suction chambers, link use through brake piping and brake wheel cylinder again, former three is by respectively there being four dowel bolts 11 to connect through nut 10 on the housing two ends, the servo-unit left and right sides, two valve bodies 3,23 all have knock hole Φ 6 fixing.The former has admission port Z1 by valve body 3, with valve body 9 through thread segment be connected and U type groove in valve body left and right sides both ends of the surface in place seal ring 6,32, guarantee the sealing of two connecting bridges.There is a breather pipe 8 to communicate between the shell of valve body 9 an and servo-unit left side and seals, have a hole Φ 1 to communicate on the valve body 9 with atmosphere.Push rod 38 is by valve body 3; the seal ring 30 at 9 two ends; 29 and valve body in air inlet valve 4; the seal ring 30 of blow off valve 7 central authorities; 29; and spring 5; 35; 34; spring 5 is pushed air inlet valve to left end makes it be in closed condition; the rigidity of spring 35 is big than spring 34; spring 34 is blow off valve 7; spring 35; push rod is pushed left end (spring 35 quarters be stressed and do not compress) together to; blow off valve 7 is opened; be C; D communicates with atmosphere through Φ 1 hole; the cleaning that dust protecting cap 36 each journey of protection pushrod movement row are arranged between the push rod valve body 3; the push rod left end is equipped with catch 2 through snap ring 37 location; initial condition catch 2 contacts with the travel switch 1 (left end) of two groups of contacts; and making one group of contact conducting, another organizes disconnection.

Low pressure servo-unit left and right sides upper casing 12,17 connects through bolt 11, nut 10 through anchor ear 16, piston 13 and pull back spring 15 are housed in the shell, respectively there are two U type grooves that the sealing that seal ring 29,14 guarantees piston internal and external parts when moving is housed by adjusting lever 33 and inside and outside circle part in the middle of the piston, three uniform bolts 18, nut 10 are arranged on the left shell.That regulates that bolt 18 can change piston 13 moves right stroke (needing by nut 10 lockings), promptly changes peak output oil pressure (braking force).

The dual-chamber brake of three chamber oil-feeds also has oil inlet Z2,3,4 (being connected with cistern) on the sealed valve body by valve body 23, end cap 24 through being threaded, oil outlet Z6,7 and locate two hole Φ 6, oil inlet Z3,4 all has fuel feed hole Φ 2, compensation orifice Φ 3, oil outlet Z6,7 all is equipped with delivery valve (not drawing), and end cap Z5 mouth is equipped with hydraulic efficiency pressure switch (not drawing).This valve is except that having the fluid pressure linkage characteristics, right-hand member piston 22 is by snap ring 21 location, making in piston 22 motion processes is subjected to circumferential force more even, avoided the monolateral phenomenon of wiping mutually, the trough of belt push rod 28 groove depth groove widths that increase are H4, communicate with the hole Φ 5 of piston 27 central authorities, and the Z8 mouth (not drawing) that is connected to check valve connects, piston 22,27 pull back spring is 26,25, the trough of belt push rod is by long handle piston 31 and seal ring 29 is arranged, and the long handle piston is by valve body left end central part and seal ring 30 is arranged, piston 31,27,22 all have fuel feed hole Φ 4, leather cup 19 is arranged between piston and the valve body, 20 sealings, leather cup 19 has the one-way sealing effect with Φ 4 holes.

When brake pedal force P is zero, as Fig. 1 institute, 1 one groups of contact conductings of left lateral journey switch, indication lamp for vehicle running shows.

When doing the time spent at slipper power P, push rod 38 is pushed to the right, first compression spring 34, and when push rod moves right when reaching H2, blow off valve is closed fully, has cut off Φ 1 hole in B, D chamber and C chamber, promptly cuts off communicating with atmosphere.Adjusting lever 33 trough of belt push rods 28, piston 31 also are pushed to right-hand member displacement H2 at this moment, spring 26 is compressed, and b chamber volume increases pressure and reduces, and a chamber oil enters through hole Φ 4, b chamber volume reduces pressure and increases, owing to fluid pressure linkage structure Z7, Z6 pressure oil output--produce braking.The e cavity pressure increases the demonstration of Z5 mouth hydraulic efficiency pressure switch conducting stop, tail and number plate light simultaneously, disconnects (indicator lamp extinguishes) when push rod 38 catch 2 when moving breaks away from left lateral journey switches 1 indication lamp for vehicle running switch, and another group contact conducting--speed-slackening signal demonstration.1, one group of contact conducting of right lateral journey switch--exhaust valve closure signal aspect and indication when displacement H2.

Continue to increase treadle effort P, push rod 38 continues to move right, when displacement reaches H1 (during H1＞H2), push rod directly contacts with the air inlet valve left side, increasing treadle effort P inlet open low-pressure air again enters the B chamber from Z1 mouth A chamber through the space of air inlet valve and valve body and all enters the D chamber through breather pipe 8, thereby promote piston 13 compression springs 15, and promotion long handle piston 31 moves right, b chamber volume reduces pressure and raises, when pressure during greater than the d chamber through groove H4, hole Φ 5 enters the d chamber by the delivery valve of Z8 mouth, and the d cavity pressure raises, and is same because the fluid pressure linkage structure makes Z6, the Z7 delivery pressure raises.Moving to＞long handle piston right side directly contacts with the trough of belt push rod during H2, just move right compression spring 26, make rising of Z7 delivery port pressure and fluid pressure linkage constructional feature that Z6 mouth output oil pressure is further raise and reach the further power-assisted purpose of increase of braking force by piston promotion long handle piston trough of belt push rod and piston 27.

Export maximum oil pressure (braking force) and decided by air pressure and piston 13 areas, but the adjustment of the effective travel H3 by piston 13 can limit certain braking liquid delivery pressure, adjustable bolt 18 needs nuts 10 lockings.

Claims (1)

1. A kind of B automobile double pipeline hydraulic brake low-pressure air booster type hydraulic braking driving device is characterized in that:

   A, this installs valve body (left side) (3), valve body (right side) (9) is sealed by threaded connection, valve body (left side) 3 has knock hole Φ 6, intake interface Z1, valve body (right side) (9) right side has the bolt (11) on four holes and the housing (12) to be connected and to seal through nut (10), also have breather pipe (8) sealing to link, and hole Φ 1 who communicates with atmosphere, multistage trapezoidal push rod (38) is by valve body (3), (9) inner chamber, sealed at both ends with valve body, the spring of inner chamber (5), (34), (35) make air inlet valve (4), blow off valve (7) is in respectively closes and opening, be B, C, the D chamber communicates with atmosphere, push rod (38) upper stop piece (2) makes the running light conducting with switch (left side) (1) simultaneously, and push rod (38) has dust protecting cap (36) with valve body (left side) (3);

   B, this installs left and right housing (12), (17) linking portion flange and is linked through bolt (11), nut (10) by anchor ear (16), left and right housing two inner end surfaces are welded with bolt (11) respectively, the left shell linking portion is sealing, the porose sealing with pipeline (8) links on the left shell, the bolt (18) that right shell body (17) has a screw and adjustment piston (13) stroke to use cooperates by nut (10) locks, inner chamber has piston (13), pull back spring (15), and piston (13) and inner walls are for being sealed and matched;

   C, this device valve body (23) has 2 knock hole Φ 6, left end has four holes and housing (17) bolt to link through nut (10), there are three oil-feed interface Z2 the valve body top, Z3, Z4 links with oil-storing cup by the road, Z3 wherein, fuel feed hole Φ 3 is respectively arranged in the Z4 mouth, there are 2 output interface Z6 compensation orifice Φ 2 belows, Z7 links through delivery valve and front and back brake piping, left end cap (24) is linked by thread seal with valve body, end cap interface Z5 and hydraulic efficiency pressure switch link, inner chamber has piston (31), (27), (22), push rod (28), pull back spring (25), (26), the location snap ring (21) of piston (22), the right projection of piston (27) has groove width to be H4 deeply and communicates with medium pore Φ 5, in its right-hand member Z8 interface delivery valve is housed, piston (31), (27), (22) cooperate with valve interior wall leather package is housed, opening is towards improving in order to sealing property to the right.