CN2410195Y

CN2410195Y - Pressure sensing booster

Info

Publication number: CN2410195Y
Application number: CN 00205985
Authority: CN
Inventors: 汪沛华
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-02-29
Filing date: 2000-02-29
Publication date: 2000-12-13
Anticipated expiration: 2010-02-28

Abstract

The utility model discloses a pressure sensing booster for hydraulic systems, composed of an integral cylinder body provided with stepped holes of different cylinder diameters and pistons provided with a sealing device and inner holes by matching with the cylinder body. The utility model is provided with an oil inlet, an oil outlet, a pressure sensing booster, a plunger device, a spring, and an oil and gas storage chamber, wherein, the plunger device is provided with an oil outlet channel an oil passing channel, and a sealing device of a plunger rod. After pressure increasing to a set value, an oil inlet channel is closed by the plunger device to make the hydraulic systems pressurized. The utility model has the advantages of no need of other power source, larger pressurizing range, quick reaction, short working travel, simple structure, and long service life.

Description

The pressure-sensitive blwr

The utility model relates to the pressure-sensitive blwr that a kind of hydraulic efficiency pressure system is used, and is particularly useful for hydraulic brake system of motor vehicle.

To adopt hydraulic intensifier be hydraulic efficiency pressure system in order to one of usual practice of pressure boost.The general at present power actuated vehicle that adopts hydraulic brake system, in order to obtain enough braking forces, usually the method that adopts devices such as installing vacuum booster, vacuum booster, air pressure booster is in order to increase the pressure of braking liquid, these devices need propulsions source such as vacuum source, compressed air source, and its baroque shortcoming is conspicuous; And the general hydraulic intensifier that the hydraulic actuating cylinder that adopts stepped hole and piston by different cylinder diameters to constitute is in series, though simple in structure, the shortcoming of its its forced stroke proportional increase with the increase of pressure when supercharging makes its range of use be subjected to certain limitation.Utility model ZL96233931.8 " hydraulic vehicle brake blwr " is though done improvement to traditional hydraulic intensifier, but its supercharging multiple and supercharging actuating pressure all are subjected to the certain limitation of its structure, and the low pressure oil pocket of its splicing construction is too complicated and influence service life.

The purpose of this utility model, provide a kind of other propulsions source that do not need, can satisfy gap needed different supercharging actuating pressure requirement between bigger supercharging multiple of scope and elimination brake shoe brake cheek and the braking hub, can reduce forced stroke to greatest extent, and simple in structure, reliable operation, long service life, easy to install, fabrication properties good, cost is low novel pressure-sensitive blwr.

The utility model adopts such technical scheme to realize: the utility model pressure-sensitive blwr matches by the cylinder body of the stepped hole with different cylinder diameters and with it and piston that sealing arrangement and oil inlet passage be housed constitutes, be provided with oil inlet, oil outlet, be characterized in: have in the pressure-sensitive booster cavity of cylinder body left end of integral type cylinder barrel and be provided with plunger assembly and spring, plunger assembly left end and pressure-sensitive booster cavity endoporus match to merge and are provided with oil discharge passage and communicate with oil outlet, its right-hand member matches with oil inlet passage and slides therein, and be provided with the plunger rod sealing arrangement that constitutes by seal ring and cross oily passage, the spring left end withstands on the pressure-sensitive booster cavity left side, right-hand member heads on piston it is pushed away to the right, upper right side, left side in the bigger right chamber of diameter of cylinder, be provided with the inside and be marked with an amount of braking liquid, top is provided with the oil storage air storing cavity of the Open architecture of the air extractor vent that communicates with atmosphere and corresponding exclusion seal device, is connected by logical oily air extractor vent and the right chamber of cylinder body; In another embodiment, plunger assembly left end and pressure-sensitive booster cavity endoporus match to merge and are provided with oil discharge passage and communicate with oil outlet, and its right-hand member is provided with the plunger rod sealing arrangement that is made of conical seal ring that matches with oil inlet passage and slide therein during supercharging and reaches the oily passage of mistake that is made of the gap between this plunger rod sealing arrangement and the oil inlet passage; In yet another embodiment, the plunger rod left end of plunger assembly withstands on the plunger rod spring that is blocked by back-up ring in the oil inlet passage, its middle part diameter is provided with vertical oil groove right side than large part and is provided with the sealing surface that matches with the conical bore of oil inlet passage right-hand member, the conical bore that the oil inlet passage right-hand member is passed at the thin position of its right-hand member diameter withstands on the oil inlet left side, forms the oily passage of mistake that is made of the gap between vertical oil groove, sealing surface and the oil inlet passage; In another embodiment, the structure of plunger assembly is: plunger body slides in the interior pressure-sensitive chamber of piston left end by the plunger body sealing arrangement, the left end of plunger body is provided with shutoff and back-up ring, its right-hand member is established thrust spring, plunger rod spring and plunger rod, plunger rod slides in hole, an oil inlet passage left side and is sealed by the plunger rod sealing arrangement, its right-hand member matches with the sealing surface of oil inlet passage stepped hole joint, be provided with oily passage in the sealing surface left side, oil inlet passage is connected with the pressure-sensitive booster cavity, is made into and the extraneous enclosed construction that does not communicate at this oil storage air storing cavity.

Adopt such scheme, compare with devices such as adopting vacuum booster, it does not need other propulsions source, and structure is simpler, installation is more convenient, the reaction is faster, more reliable; Compare with the general hydraulic intensifier of employing, it can satisfy wider supercharging multiple and eliminate brake shoe brake cheek and the requirement of braking the needed different supercharging actuating pressures in gap between the hub, and reach at identical treadle effort under the condition of identical supercharging value, react faster, forced stroke is shorter, structure is simpler, processing is more convenient, longer service life, cost are lower.

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

Fig. 1 is the schematic diagram that adopts the hydraulic brake system of motor vehicle of the utility model pressure-sensitive blwr.

Fig. 2 is the cutaway view of an embodiment of the utility model pressure-sensitive blwr.

Fig. 3 is the cutaway view of another embodiment of the utility model pressure-sensitive blwr.

Fig. 4 is the cutaway view of another embodiment of the utility model pressure-sensitive blwr.

Fig. 5 is the cutaway view of another embodiment of the utility model pressure-sensitive blwr.

Adopt in the hydraulic brake system of motor vehicle of the utility model pressure-sensitive blwr at Fig. 1, to receive on the oil inlet 31 of this pressure-sensitive blwr 4 from the transport pipe 3 of master brake cylinder master cylinder 2 outputs, the transport pipe 5 of transporting to brake cylinder 6 is connected with the oil outlet 37 of pressure-sensitive blwr 4, and its brake operation course is identical with general hydraulic brake system of motor vehicle.Glancing impact depresses brake pedal 1, and the braking liquid of output is imported pressure-sensitive blwrs 4 through transport pipe 3 from master brake cylinder master cylinder 2, transports to brake cylinder 6 through transport pipe 5 again, and promotion brake shoe brake cheek 7 is eliminated gap generation braking force near braking hubs 8 and made car brakeing.

In an embodiment of Fig. 2 hydraulic intensifier, pressure-sensitive blwr 4 matches by the cylinder body 9 of the stepped hole with different cylinder diameters and with it and piston 10 that sealing arrangement and oil inlet passage 32 be housed constitutes, its right-hand member is provided with oil inlet 31, left end is provided with oil outlet 37, be characterized in: have in the pressure-sensitive booster cavity 35 of cylinder body 9 left ends of integral type cylinder barrel and be provided with plunger assembly 13 and spring 12, plunger assembly 13 left ends and pressure-sensitive booster cavity 35 endoporus match to merge and are provided with oil discharge passage 36 and are connected with oil outlet 37, its right-hand member matches with oil inlet passage 32 and slides therein, and be provided with the plunger rod sealing arrangement 15 that constitutes by seal ring and cross oily passage 34, spring 12 left ends withstand on pressure-sensitive booster cavity 35 left sides, right-hand member heads on piston 10 it is pushed away to the right, upper right side in the bigger left side, right chamber of cylinder body 9 diameters, be provided with the inside and be marked with the open oil storage air storing cavity 11 that an amount of braking liquid and top are provided with air extractor vent and corresponding exclusion seal device, be connected with cylinder body 9 right chambeies by logical oily air extractor vent 33.At the beginning of braking procedure, the braking liquid that enters from oil inlet 31, enter pressure-sensitive booster cavity 35 through oil inlet passage 32, the oily passage 34 of mistake, again through oil discharge passage 36, directly carry the braking liquid of non-intensified to brake cylinder 6 from oil outlet 37, promote brake shoe brake cheek 7 eliminate its with braking hub 8 between the gap, this process is faster by the later braking liquid promotion antibacklash process reaction of supercharging fully at the very start than adopting general hydraulic intensifier, forced stroke is shorter; After the gap between brake shoe brake cheek 7 and the braking hub 8 is eliminated, brake shoe brake cheek 7 suffered resistances increase, the pressure of the braking liquid in the pressure-sensitive booster cavity 35 also increases thereupon, when the increased pressure of braking liquid arrives the setting value of supercharging actuating pressure, the thrust that overcomes spring 12 under the piston 10 at both ends action of pressure is moved to the left, after the plunger rod sealing arrangement 15 on the plunger assembly 13 is with oil inlet passage 32 sealings, from then on braking liquid can not directly continue to be moved to the left by promoting piston 10, the braking liquid supercharging under the effect of piston 10 in the pressure-sensitive booster cavity 35.When piston 10 was moved to the left, the space between the left side in the right chamber of the left side of its big end and cylinder body was compressed, exclusion seal device and air extractor vent exhaust to atmosphere by oil storage air storing cavity 11 tops behind the air pressurized wherein.

In another embodiment of Fig. 3 pressure-sensitive blwr, plunger assembly 13 left ends and pressure-sensitive booster cavity 35 endoporus match to merge and are provided with oil discharge passage 36 and are connected with oil outlet 37, and its right-hand member is provided with the plunger rod sealing arrangement 15 that is made of conical seal ring that matches with oil inlet passage 32 and slide therein during supercharging and reaches the oily passage 34 of mistake that is made of the gap between this plunger rod sealing arrangement 15 and the oil inlet passage 32.

In another embodiment of Fig. 4 pressure-sensitive blwr, plunger rod 14 left ends of plunger assembly 13 withstand on the plunger rod spring 17 that is blocked by back-up ring 21 in the oil inlet passage 32, its bigger position of diameter, middle part is provided with vertical oil groove right side and is provided with the sealing surface that matches with the conical bore of oil inlet passage 32 right sides, the conical bore that oil inlet passage 32 right-hand members are passed at the thin position of its right-hand member diameter withstands on the left side of oil inlet 31, forms the oily passage 34 of mistake that is made of the gap between the conical bore of vertical oil groove and sealing surface and oil inlet passage 32 right sides.At the beginning of braking procedure, the braking liquid that enters from oil inlet 31, passed through oily passage 34, oil inlet passage 32 enters pressure-sensitive booster cavity 35, directly carries the braking liquid of non-intensified from oil outlet 37 to brake cylinder 6 again, promote brake shoe brake cheek 7 and eliminate and the gap of braking between the hub 8; After the gap between brake shoe brake cheek 7 and the braking hub 8 is eliminated, brake shoe brake cheek 7 suffered resistances increase, the pressure of the braking liquid in the pressure-sensitive booster cavity 35 increases thereupon, when the increased pressure of braking liquid arrives the setting value of supercharging actuating pressure, under the piston 10 at both ends action of pressure, the thrust that overcomes spring 12 is moved to the left, when plunger rod 14 is moving right mistake after oily passage 34 sealings under the effect of plunger rod spring 17, from then on braking liquid can not directly continue to be moved to the left by promoting piston 10, the braking liquid supercharging under the effect of piston 10 in the pressure-sensitive booster cavity 35.

In another embodiment of Fig. 5 pressure-sensitive blwr, the structure of plunger assembly 13 is: plunger body 18 slides in the interior pressure-sensitive chamber 38 of piston 10 left ends by plunger body sealing arrangement 19, the left end of plunger body 18 is provided with shutoff 20 and back-up ring 21, its right-hand member is provided with thrust spring 16, plunger rod spring 17 and plunger rod 14, plunger rod 14 slides in oil inlet passage 32 left holes and is sealed by plunger rod sealing arrangement 15, its right-hand member matches with the sealing surface of oil inlet passage 32 stepped hole joints, be provided with oily passage 34 in the sealing surface left side, oil inlet passage 32 is connected with pressure-sensitive booster cavity 35, makes and the extraneous enclosed construction that does not communicate at the cavity of this oil storage air storing cavity 11.At the beginning of braking procedure, braking liquid from oil inlet 31 enters enters pressure-sensitive booster cavity 35 through oil inlet passage 32 from crossing oily passage 34, again through oil discharge passage 36, directly carry the braking liquid of non-intensified to brake cylinder 6, promote brake shoe brake cheek 7 and eliminate itself and the gap of braking between the hub 8 from oil outlet 37; After the gap between brake shoe brake cheek 7 and the braking hub 8 is eliminated, brake shoe brake cheek 7 suffered resistances increase, the increased pressure of the braking liquid in the pressure-sensitive booster cavity 35, after increased pressure arrives the setting value of supercharging actuating pressure, plunger body 18 overcomes thrust spring 16 under the effect of brake fluid pressure resistance moves right, force the increased pressure in the interior pressure-sensitive chamber 38 and promote plunger rod 14 and move right oil inlet passage 32 sealings, make braking liquid can not be directly from then on be moved to the left the braking liquid supercharging under the effect of piston 10 in the pressure-sensitive booster cavity 35 by promoting the thrust that piston 10 overcomes spring 12.When piston 10 was moved to the left, the space between its big end left side and the left side, cylinder body 9 right chamber was compressed, air wherein by logical oily air extractor vent 33 with closed oil storage air storing cavity 11 that the external world does not communicate in be compressed.

Claims

1 one kinds of pressure-sensitive blwrs that hydraulic efficiency pressure system is used, match by the cylinder body (9) of stepped hole and with it and sealing arrangement is housed and is provided with piston (10) formation of oil inlet passage (32) with different cylinder diameters, be provided with oil inlet (31), oil outlet (37), it is characterized in that: have the plunger assembly (13) and the spring (12) that are provided with in the pressure-sensitive booster cavity (35) of cylinder body (9) left end of integral type cylinder barrel, be provided with oil storage air storing cavity (11) in upper right side, left side, the right chamber of cylinder body (9).

2 pressure-sensitive blwrs according to claim 1, it is characterized in that: described plunger assembly (13), its left end and pressure-sensitive booster cavity (35) endoporus match to merge and are provided with oil discharge passage (36), its right-hand member matches with oil inlet passage (32) and slides therein, is provided with the plunger rod sealing arrangement (15) that is made of seal ring and crosses oily passage (34).

3 pressure-sensitive blwrs according to claim 1, it is characterized in that: its left end of described plunger assembly (13) and pressure-sensitive booster cavity (35) endoporus match to merge and are provided with oil discharge passage (36), its right-hand member matches with oil inlet passage (32) and slides therein during supercharging, is provided with the plunger rod sealing arrangement (15) that is made of conical seal ring and by the oily passage of mistake (34) of the formation of the gap between this plunger rod sealing arrangement (15) and the oil inlet passage (32).

4 pressure-sensitive blwrs according to claim 1, it is characterized in that: its left end of plunger rod (14) of described plunger assembly (13) withstands on the plunger rod spring (17) that is blocked by back-up ring (21) in the oil inlet passage (32), its bigger position of diameter, middle part is provided with vertical oil groove right side and is provided with the sealing surface that matches with the conical bore of oil inlet passage (32) right-hand member, the right-hand member that its diameter is thinner passes on the left side that conical bore withstands on oil inlet (31), forms the oily passage of mistake (34) by the formation of the gap between vertical oil groove, sealing surface and the oil inlet passage (32).

5 pressure-sensitive blwrs according to claim 1, it is characterized in that: the plunger body (18) in the pressure-sensitive chamber (38) matches by the endoporus of plunger body sealing arrangement (19) with interior pressure-sensitive chamber (38) described plunger assembly (13) in piston (10) left end by being arranged on, its left end is provided with shutoff (20) and back-up ring (21), its right-hand member is provided with thrust spring (16), plunger rod spring (17) and plunger rod (14), the right-hand member of plunger rod (14) slides in the left hole of oil inlet passage (32) and is sealed by plunger rod sealing arrangement (15), its right-hand member matches with the sealing surface of the junction of oil inlet passage (32) stepped hole, be provided with oily passage (34) in the sealing surface left side, oil inlet passage (32) was connected with pressure-sensitive booster cavity (35).

6 pressure-sensitive blwrs according to claim 1, it is characterized in that: described oil storage air storing cavity (11), be located at the upper right side of the bigger left side, right chamber of cylinder body (9) diameter, the inside is marked with an amount of braking liquid, be connected with the right chamber of cylinder body (9) by logical oily air extractor vent (33), it can be made into the Open architecture that top is provided with the air extractor vent that communicates with atmosphere and corresponding exclusion seal device and also can be made into and the extraneous enclosed construction that does not communicate.