CN1777529A - Plunger-type master cylinder - Google Patents
Plunger-type master cylinder Download PDFInfo
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- CN1777529A CN1777529A CN 200480010751 CN200480010751A CN1777529A CN 1777529 A CN1777529 A CN 1777529A CN 200480010751 CN200480010751 CN 200480010751 CN 200480010751 A CN200480010751 A CN 200480010751A CN 1777529 A CN1777529 A CN 1777529A
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Abstract
The present invention provides a plunger-type master cylinder where, without impairing the durability of a seal ring (70), an ineffective stroke is reduced and residual pressure is prevented from remaining. A piston (91) of a master cylinder has a recess (93) in its outer periphery and a relief port (900) in the recess (93). The seal ring (70) has a seal joint portion (70s) on the inner periphery of the tip portion of an inner peripheral lip (701). When a brake is in non-operation state, the seal joint portion (70s) is positioned at an opening of the relief port (900) on the piston (91) side. The distance from the seal joint portion (70s) to the relief port (900) is small. Further, the seal ring (70) has a first and a second projection (7006, 7002) on the inner periphery of the inner peripheral lip (701). The projections (7006, 7002) establish an operating liquid flow passage on the inner peripheral side of the inner peripheral lip (701).
Description
Technical field
The present invention relates to employed plunger-type master cylinders such as a kind of hydraulic vehicle brake system, the master cylinder technology of the control of braking that carries out respectively about the control of braking that is suitable for carrying out (when for example, the autobrake control used of vehicle ability of posture control or vehicle quicken the tractive force control of control drive wheel braking force etc.) particularly with the driver.
Background technology
As this plunger-type master cylinder, be the high cylinder of durability that so-calledly on through the piston that moves along axis direction in the cylinder hole of cylinder body, is provided with outgate, is used to open and close the seal ring of outgate.
As the major technique problem of this plunger-type master cylinder, the 1st is the invalid stroke that operation produced that reduces along with braking; The 2nd is to prevent that non-braking work schedule hydrodynamic pressure from remaining in the thing generation of hydraulic pressure chamber (so-called residual hydraulic pressure).Relevant prior art for example has: DE19536325A1 communique (particularly with reference to its Fig. 1), it is technology as the invalid stroke of minimizing of realization the 1st, front end at the piston 13 with outgate 20 is provided with path part 40, disposes seal ring 11 on this path part.In addition, the spy opens 2000-108878 communique (particularly with reference to its Fig. 2), still is the technology as the invalid stroke of minimizing of realization the 1st, and the peristome rear side of the outgate 56 on the outer peripheral face of piston 13 is provided with the control conical surface 86, utilize this conical surface 86, the interior week of sealing cup seal 46.Further, the spy opens 2001-146157 communique (particularly with reference to its Fig. 2), be as the technology that prevents excess pressure that realizes the 2nd, relative piston 4, except being provided with outgate 4c, rear side at this outgate also is provided with safety vent 4e, by means of this safety vent, opens the pressure of hydraulic pressure chamber reliably.
The present inventor notices plunger-type master cylinder up to the present reducing invalid stroke and the technological development stage that prevent two problems of excess pressure in order to solve, and all interosculates.Realize the common ground that piston and the position that seals its seal ring on every side concern.In other words, when master cylinder was in off working state, interior all lips of seal ring its leading section are at least seen the front side that is positioned at outgate from axis direction, and were relative therewith, and when master cylinder was in running order, interior all lips of sealing ring were positioned at the rear side of outgate.Therefore, when master cylinder carries out the various state of inoperative-work repeatedly, interior all lips of seal ring, at least should in two edge of the 1st edge of open back side of the 2nd edge of open front side of leading section crosscut outgate of all lips and outgate.From axis direction, the front side of outgate is the side near hydraulic pressure chamber, and rear side is the side near cylinder hole opening.
At the outgate that opens wide on the piston for example is that diameter is the hole about 2mm, processing aspect, hole, and the edge of outgate peristome has corner angle.Therefore, this edge of crosscut, otherwise several times, As time goes on the sealing lip that elastomeric material is made will produce fatigue phenomenon and deterioration.The problem of the durability of seal ring has appearred impairing as a result.In addition, safety vent is set on piston, though prevent that the excess pressure aspect is better,, if possible, people wish that still the hole that relative piston carries out processes and should lack as much as possible.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of durability that can not damage seal ring, can solve the plunger-type master cylinder that reduces invalid stroke and prevent two problems of excess pressure.
Another object of the present invention is that the hole that provides a kind of relative piston to carry out adds the technology that prevents that trade union carries out excess pressure as much as possible less and effectively.
Other purpose of the present invention will be better appreciated by from the following description.
In the present invention, consider to adopt following proposal, promptly the interior all lips by making seal ring and the outgate of piston side are in the certain location relation, improve the durability of seal ring, solve two problems that reduce invalid stroke and prevent excess pressure simultaneously effectively.The essential characteristic of this consideration scheme is following feature 1,2 and 3 each points, and further supplementary features are feature 4 described later and 5.
Feature 1. is on the outer peripheral face of piston, be provided with from axis direction and see 1st edge (leave the edge of hydraulic pressure chamber side one side) of the 2nd edge from the outgate opening (near the edge of hydraulic pressure chamber side one side) to the outgate opening, and then the 1st end side from the 1st edge of this outgate opening to distance cylinder hole opening has the part to set a distance, and spreads all over all recesses of piston circumferencial direction.
The medial lip of feature 2. seal rings is to be in the diameter of the diameter of free-ended leading section one side less than the root of base portion one side, therefore, seal ring is the week that the seal junction that combines with the periphery wall face sealing of piston is positioned at the leading section of the little medial lip of diameter, and, the periphery wall of interior week of medial lip and piston, be provided with above-mentioned recess the space that combines, outgate is communicated with communication paths from the sealing joint portion to root.
The seal junction of the medial lip leading section of feature 3. seal rings, when master cylinder was in off-position, its part in the face of the outgate of piston side entered the opening of this outgate.
Owing to be provided with the recess of the piston peripheral part of feature 1; Being provided with seal junction and the interior week of medial lip and the space between the piston periphery wall of the seal ring of feature 2, so, when master cylinder is in inoperative, hydraulic pressure chamber can be communicated with tank side.And, because the master cylinder of feature 3 seal junction (or leading section of seal ring medial lip) when being in off-position the brand-new and configuration of characteristics is arranged, so, can realize the raising of seal durability and the minimizing of invalid stroke.Particularly, feature 1～3 can not damaged other features each other, and cooperation helps to solve 3 problems mutually.
Particularly, when master cylinder was in inoperative, the leading section of seal ring medial lip was arranged in the outgate opening, this means the carrying out along with the inoperative-work of master cylinder, and the seal junction of seal ring is the edge of the 1st edge one side in the crosscut outgate opening edge only.Thereby when carrying out inoperative-work repeatedly, the number of times of crosscut edge can reduce by half, and only this awaits improving the durability of seal ring.
The bore of outgate (diameter of the axis direction of opening) for example is about 2mm, in contrast to this, change along with relative motion (distance of the axis direction) action of master cylinder, seal ring and piston though because of the mode of braking, but the stroke amount of axis direction is for for example counting about mm～10mm.Therefore, when working usually, the seal junction of seal ring is positioned on the periphery of the piston of crossing recess, and still, when slight braking work, the seal junction also is arranged in recess.
Though the recess of piston periphery spreads all over piston on the circumferencial direction of piston all,, on axis direction, only spread all over outgate limited area on every side, therefore, piston has the big part of diameter before and after recess.In better form, the two parts before and after these recesses of piston are by the piston guide portion guiding of cylinder body side.If at recess front side plunger guide part, then since be outgate with the seal junction of the seal ring that enters its opening near the position, so, be actv. making aspect the sealing force uniformization along the circumferential direction of seal ring.
Owing between the periphery wall of week and piston the space is arranged in the medial lip of seal ring, by this space and communication paths, excess pressure that can be when tank side discharges inoperative can also prevent excess pressure usually thus.But, during autobrake work, the effect of pump is by hydraulic pressure chamber during with wheel cylinder one side of the operating fluid supply brake equipment of tank side, because the hydraulic pressure change of operating fluid etc., the medial lip of seal ring swingingly is out of shape, the space that constitutes path narrows down, liquid supply deficiency, and this should consider.In order to guarantee this liquid supply effectively, in best form of implementation of the present invention, following feature 4 and/or feature 5 have further been adopted for seal ring.
Feature 4. seal rings are between the root and seal junction on the inner peripheral surface of medial lip, be provided with from the inner peripheral surface of medial lip the 1st jut to the outer peripheral face protuberance of piston, the 1st jut is provided with to devices spaced apart a plurality of in a circumferential direction, thereby, be provided with the stream of axis direction between the 1st adjacent in a circumferential direction jut.
Feature 5. seal rings can with medial lip with above-mentioned root be the center to radially inner side and outside the mode of side oscillation be out of shape, and on base portion, the inner side of one side of extending at medial lip and lateral lip, be provided with the bump of the wall thickness of medial lip one side that makes the base portion axis direction greater than the wall thickness of lateral lip side, compare with the situation that this bump is not set, the center of oscillation of medial lip is positioned at the position near the 2nd end one side on the axis direction.
In addition, as the variation with feature 4, and the 1st jut is provided with the 2nd jut (that is to say that the jut between root and the seal junction is two row) side by side, therefore, can guarantee the space of interior all sides of medial lip reliably.In addition, feature 4 and feature 5 are even effect separately also can act on aspect the liquid supply effectively guaranteeing.But also the form of usefulness can be better for both.
In master cylinder of the present invention, owing to seal ring is installed in the cylinder body side, therefore, slip ring is inserted the interior week in cylinder hole, can support leak free one side by means of an end of this slip ring, but, preferably, on the internal perisporium face in the cylinder hole of cylinder body, directly be provided for assembling, installing the mounting groove of seal ring.This is owing to can reduce the number of parts, and the position of the outgate that can guarantee piston side more accurately and the seal ring of cylinder body side concerns.Seal ring is in such mounting groove, and base portion enters in this mounting groove, and the seal junction in week is outwards outstanding from this mounting groove in the leading section of interior all lips.
The present invention is not only applicable to general series connection form, and is applicable to the single cylinder form.In addition, when being used to connect form, be applicable to the both sides (being the both sides of plunger piston type) of main side and secondary side, also be applicable to one side's (being a side of plunger piston type).
Description of drawings
Fig. 1 is the cross sectional drawing along axis of the tandem plunger-type master cylinder of one embodiment of the invention.
Fig. 2 is near the amplification profile diagram the master cylinder outgate shown in Figure 1, is the scheme drawing of the non-braking mode of operation of expression.
Fig. 3 is near the amplification profile diagram the master cylinder outgate shown in Figure 1, is the scheme drawing of expression along with the stroke midvoyage condition of braking work.
Fig. 4 is near the amplification profile diagram the master cylinder outgate shown in Figure 1, is the scheme drawing of expression along with the stroke SOT state of termination of braking work.
Fig. 5 A is the cross sectional drawing of leak free the 1st form used in the present invention.
Fig. 5 B is a leak free scheme drawing of observing Fig. 5 A from axis direction.
Fig. 6 A is the cross sectional drawing of leak free the 2nd form used in the present invention.
Fig. 6 B is a leak free scheme drawing of observing Fig. 6 A from axis direction.
Fig. 7 is the amplification profile diagram of leak free the 3rd form used in the present invention.
Fig. 8 is the amplification profile diagram of leak free the 4th form used in the present invention.
The specific embodiment
Fig. 1 is an embodiment who adopts tandem plunger-type master cylinder of the present invention.Tandem master cylinder 10 has separate main portion 101 and slave part 102.In illustrated embodiment, these two parts 101,102 have adopted the scheme that the present invention considered.
All formations of tandem master cylinder 10 at first, are described with reference to Fig. 1.The cylinder body 20 that the shell of master cylinder 10 is made up of aluminum alloy.Cylinder body 20 tops are provided with the boss portion 201 that is used to support fuel tank 30, and inside is provided with cylinder hole 22, and extend along axis direction to mouth osed top the 2nd end 20b from the 1st end 20h that mouth opens wide in this cylinder hole 22.Boss portion 201 is supported the part of the fuel tank 30 of storage operating fluid, its inboard adaptor union 301,302 that is connecting fuel tank 30 with embedding.With each adaptor union 301,302 bonded assembly stream be separate in main side and secondary side.
When the 1st end 20h that opens wide along axis direction from mouth observes cylinder hole 22 to mouth osed top the 2nd end 20b, the 1st path hole 221s is positioned at the part near the 1st end 20h, diameter is positioned at the inside of the 1st path hole 221s greater than the 1st big footpath hole 221b of the 1st path hole 221s, the 2nd path hole 222s identical with the 1st path hole 221s diameter, more the inside at the 1st big footpath hole 221b, be positioned on the limit of boss portion 201 inboards, and the 2nd big footpath hole 222b identical with hole, the 1st big footpath 221b diameter is positioned at the inside in cylinder hole 22.The 1st big footpath hole 221b that diameter is big and the each several part of the 2nd big footpath hole 222b are its inboard parts that constitutes hydraulic pressure chamber.Because diameter is big, so, cylinder body 20 can be made small-scale structure, and mark off the bigger hydraulic pressure chamber of volume ratio.On the other hand, the 1st path hole 221s that diameter is little and the each several part of the 2nd path hole 222s are to be provided with the part that is used to install the leak free mounting groove, also are the part of formation to the piston guide portion of the mobile guide of piston.Owing to be positioned at week, so, can process or carry out surface treatment the internal perisporium face of the each several part of these the 1st paths hole 221s and the 2nd path hole 222s.Therefore, can obtain being suitable for the form of guide function.Certainly, constitute the each several part in cylinder hole 22, the part each other that it adjoins each other, the tapering of relatively relaxing by the angle of inclination links together.
When paying close attention to the each several part of the 1st path hole 221s and the 2nd path hole 222s, on these parts, respectively along the axis direction partition distance be provided with 2 the sealing mounting grooves 40,42, in the centre of these mounting grooves 40,42, be provided with the communication paths (or constituting this a part of path) that is communicated with fuel tank 30.The communication paths 52 of slave part 102 comprises around the annular groove 522 in weeks Monday in the cylinder hole 22 and connects the wall of cylinder body 20 and be communicated with the perforation path 524 of annular groove 522 and boss portion 201 inboards.In addition, the communication paths 50 of main portion 101 is except having with the same annular groove 502 of slave part 102 and connecting the path 504, also comprises with cylinder hole 22 parallel tendencies, is communicated with the fuel tank intercommunicating pore 506 of annular groove 502 and boss portion 201 inboards.The part of peristome that is used for the 1st end 20h side of closed fuel tank intercommunicating pore 506 is the blind bolt 508 that is made of ball.In addition, the periphery of surrounding the cylinder body 20 of fuel tank intercommunicating pore 506 is provided with and is used for master cylinder 10 is installed in mounting flange 203 on the blwr (not shown).In addition, the valve body 60 of the gyro shape of boss portion 201 inboards is made of the resin material that is suspended on the operating fluid, is provided with throttling path 602 in the above.Valve body 60 constitutes valve gear with the sleeve-like valve seat constituting body 66 of boss portion 201 inboards.This valve gear has the function of cutting off this path or keeping being communicated with under throttle in hydraulic pressure chamber that is communicated with master cylinder 10 and the way of the path between the fuel tank 30.
The seal ring 70,72 that is made of the sealing of cup type is installed and supported to have to each mounting groove 40,42.In addition, the inside in cylinder hole 22 towards opening, is inserted with spring-assisted reduction 82, auxiliary piston 92, main retracing spring 81 and main piston 91 from the inside in turn.Whereby, auxiliary piston 92 marks off the 2nd hydraulic pressure chamber 1020 with the seal ring 72 of the 2nd path hole 222s part in the inside in cylinder hole 22, in addition, main piston 91 marks off the 1st hydraulic pressure chamber 1010 with the seal ring 72 of the 1st path hole 221s part between main piston 91 and auxiliary piston 92.Here, main retracing spring 81 and spring-assisted reduction 82 are entangled by a pair of spring bearing 83,84 and bar 85 respectively, therefore, can prevent under the effect of spring force, and each piston 91,92 flies out from cylinder hole 22.Though it is not shown in the figures,, on each several part, be provided with the delivery port that hydraulic pressure is just exported to brake circuit in the face of the 1st path hole 221s of each hydraulic pressure chamber 1010,1020 and the 2nd path hole 222s.Even be under the off working state at master cylinder 10, for this delivery port and hydraulic pressure chamber being linked together sleekly, can on the inner wall section in the cylinder hole 22 of the 1st path hole 221s and the 2nd path hole 222s, the groove (scheme that groove is set is with reference to the USP4524585 patent) that extends along axis direction be set.The groove that extends along axis direction is the screw-shaped groove preferably.
Master cylinder 10 is characterised in that the formation around the outgate 900.Fig. 2～Fig. 4 is near the scheme drawing of representing enlargedly the outgate 900, Fig. 2 shows the off working state of braking (being driver's braking), Fig. 3 shows the state in the stroke way of carrying out along with braking work, and Fig. 4 shows the state that carries out the stroke terminal along with braking work.Except Fig. 1,, be appreciated that the feature of master cylinder 10 with reference to Fig. 2～Fig. 4.
On each piston 91,92, on the outer peripheral face of outgate 900 openings, be provided with the annular recessed portion 93 that rounds.The degree of depth of recess 93 for example is the degree of 0.2～0.3mm, is the degree of 4～5mm for example along the width of axis direction.The both ends of the axis direction of recess 93 are provided with the conical surface 951,952 about 30 ° respectively.The outer peripheral portion 911,922 of the piston 91,92 that the bottom of the recess 93 that the conical surface 951,952 is little with diameter and diameter are big; 921, couple together to 922 smoother.One end of recess 93 (i.e. the conical surface 952 of the end of the 2nd end 20b side) is than the 2nd edge 902 close the 2nd end 20b of the 2nd end 20b side of the opening of outgate 900.On the other hand, the other end of recess 93 (i.e. the conical surface 951 of the end of the 1st end 20h side) is crossed the 1st edge 901 of the 1st end 20h side of outgate 900 openings to give set a distance near the 1st end 20h.Should be to increase the resistance to flow ground of recess 93 can be communicated with communication paths 50,52 with outgate 900 distance to set a distance.Here, though recess 93 has certain-length on axis direction,, an end diameter of the leading section of each piston the 91,92 to the 2nd end 20b side is diminished.Each piston 91,92 is crossed recess 93 and at least two of another position that axis direction leaves, the motion of its axis direction is successfully led at each leading section with from this leading section.This smooth guiding also helps each piston 91,92 to combine with effective leak free between the seal ring 70.In addition, because that recess 93 spreads all over piston 91,92 circumferential direction is all, therefore, can make the sealing surface pressure uniformization of seal ring 70 circumferencial directions.
In addition, the seal ring 70 relevant with outgate 900, in the interior week of medial lip 701 leading sections, be provided with the periphery wall face sealing of piston 91 (92) the seal junction 70s that combines.Cup seal ring 70 all is made of elastomeric material, the medial lip 701 and the lateral lip 702 that have the base portion 700 of wall thickness, extend respectively from these base portion 700 inside and outside circumferentially hydraulic pressure chamber 1010 (1020) sides.Lateral lip 702 is provided with magnitude of interference 702b on periphery, its diameter is the same, relative therewith basically to free-ended leading section from the root of base portion 700 sides, medial lip 701, and the diameter of free-ended leading section side is compared smaller with the root of base portion 700 sides.Therefore, the medial lip 701 of seal ring 70 has from root to the downward-sloping forward form of free-ended leading section.Therefore, seal ring 70 is along between the periphery wall of interior week of the medial lip 701 of root and piston 91 (92), begins to mark off annular spaces 75 from the seal junction 70s of leading section.This space 75 has the function as the intermediate connection road that outgate 900 is communicated with communication paths 50 (52).
In master cylinder 10, when master cylinder 10 is in off-position (position of Figure 1 and Figure 2), the seal junction 70s of seal ring 70 is configured in the opening portion of outgates 900 on the axis direction, piston 91 (92) sides, this means that seal junction 70s is between the 2nd edge 902 and the 1st edge 901 of outgate 900.In order to increase space 75, preferably seal junction 70s is configured near the 2nd edge 902, in addition,, preferably seal junction 70s is configured near the 1st edge 901 in order to dwindle the invalid stroke of braking.The size in space 75 when driver's brake operating (being people's brake operating), can directly not influence this operation.But when autobrake was worked, when under the effect of master cylinder 10 external pump the operating fluid of fuel tank 30 sides being supplied with brake circuits by outgate 900 and hydraulic pressure chamber 1010 (1020), the size in space 75 was easy to directly influence the supply of operating fluid.In order successfully to carry out autobrake work, space 75 is made as to more than the sizing, so that the resistance to flow when reducing operating fluid and supplying with.The recess 93 of piston 90 (92) peripheries is increasing space 75 effectively, and dwindling on the resistance to flow of operating fluid is unusual actv..In addition, the loop of autobrake itself is known, for example special the shown in Figure 7 of 2002-154420 communique of opening.
The excess pressure of space 75 when preventing to brake inoperative also is actv..Have only the distortion of the medial lip 701 of seal ring 70 can hinder preventing of excess pressure.This is because the hydraulic action in the hydraulic pressure chamber 1010 (1020) that returns after the braking work, makes the 1st edge 901 sides distortion of medial lip 701 to outgate 900 at the back side of the medial lip 701 of facing lateral lip 702, reduces the reason in space 75.
Therefore, in master cylinder 10, the countermeasure that prevents as excess pressure is in the form of seal ring 70, particularly work hard on the inner peripheral surface in the face of the medial lip 701 of the outer peripheral face of piston 91 (92).This method is, the 1st jut of protuberance is set on a plurality of positions that circumferencial direction separates each other, and guarantees the inflow of axis direction between the 1st jut of circumferencial direction adjacency all the time.By this measure, when the driver brakes work, piston 91 (92) turns back to when the off-position or (is being under the state of the seal junction 70s of the medial lip 701 leading sections part that is positioned at outgate 900 openings when the autobrake work, autobrake is carried out when the work), even medial lip 701 self produces the thing on the outer peripheral face that sticks to piston 91 (92), also can guarantee the flowing of operating fluid of all sides in the medial lip 701.
Fig. 5 A and Fig. 5 B are the examples that uses the outstanding mountain shaped protrusions 7006 of part as the 1st jut.Mountain shaped protrusions 7006 separates equal distance in a circumferential direction and is provided with for example 6.These projections 7006 are on the inner peripheral surface of medial lip 701, when the axis direction that extends from lip is observed, between the seal junction 70s of the root of base portion 700 sides and leading section.And, at the root of base portion 700 sides or on interior week, in bight in the face of space 75 or piston 91 (92) sides, equally spaced in a circumferential direction position, for example be provided with the 2nd jut 7002, be manufactured with the groove (stream) 7003 of axis direction between the 2nd jut 7002 that adjoins each other with the same position of projection 7006.In addition, cut, produce groove (stream) 7003 by bight with base portion 700.These grooves (stream) 7003 combines with stream between the mountain shaped protrusions 7006, can make operating fluid from outgate 900 to communication paths 50 (52) side flow.Thereupon, can prevent the generation of excess pressure, accomplish to prevent trouble before it happens.In addition, being communicated with reliably with stream between the mountain shaped protrusions 7006 in order to make the adjacent groove of axis direction (stream) 7003, preferably staggers mutually in the position of the circumferencial direction of the mountain shaped protrusions 7006 that the 2nd jut 7002 in bight is inboard with it.
Fig. 6 A and Fig. 6 B are another examples of the 1st jut.Be to use the example in groove that circumferencial direction extends and weir track shape zone 7008 arranged side by side.Track shape zone 7008 is designed to lower than the height of mountain shaped protrusions 7006, and area is big.But track shape zone 7008 is also same with mountain shaped protrusions 7006, makes the stream that axis direction is arranged, and can prevent the generation of excess pressure effectively.
During the non-braking mode of operation of Fig. 2, the seal junction 70s of seal ring 70 is positioned at the opening portion of the outgate 900 of piston 91 (92) sides on the axis direction.And, brake operating along with the driver, piston 91 (92) is when the 2nd end 20b side shifting, as shown in Figure 3, when seal junction 70s arrives the 1st edge 901 of outgate 900, the hydraulic pressure of hydraulic pressure chamber 1010 (1020) begins to rise, and thereupon, the pressure open state during from non-braking work begins to become very little to the invalid stroke that hydraulic pressure rises.In addition, as shown in Figure 4, stroke terminal in braking work, the seal junction 70s of seal ring 70 crosses the conical surface 951 of recess 93, be positioned at the outer peripheral portion of piston 91 (92), therefore, can make the sealing function of seal junction 70s more reliable, produce fully high hydraulic pressure at hydraulic pressure chamber 1010 (1020).
When driver's brake operating stopped, each piston 91 (92) was subjected to the effect of the restoring force of retracing spring 81 (82), turned back to the state of Fig. 2.Under this return state, the seal junction 70s of seal ring 70 becomes the in-to-in form of spying on outgate 900 openings once more.At this home position, promptly non-braking mode of operation, seal ring 70 enter in the mounting groove 42 base portion 700, and the seal junction 70s in week is slightly outwards outstanding from mounting groove 42 in the leading section of medial lip 701.Afterwards, when the driver carried out brake operating once again, with above-mentioned same, the seal junction 70s of seal ring 70 only crossed the 1st edge 901 of outgate 900, and the hydraulic pressure of hydraulic pressure chamber 1010 (1020) rises.In addition, when stopping brake operating, only cross the 1st edge 901 (not by the 2nd edge 902) of outgate 900, return original state.
Further, in master cylinder 10, in order to prevent excess pressure, in form working hard also at seal ring 70.Fig. 7 shows the free state before seal ring 70 is installed.From as can be seen aforementioned, seal ring 70 comprises base portion 700 and the medial lip 701 and lateral lip 702 that extend to a side of hydraulic pressure chamber 1010 (1020) from the interior outer peripheral portion of this base portion 700.Lateral lip 702 is provided with the tapering that becomes magnitude of interference 702b on outside circumference.In addition, medial lip 701 is at the protuberance that becomes seal junction 70s that is provided with in interior week of leading section.In addition, base portion 700 is in the bight in the face of space 75 or piston 91 (92) sides, and for example 6 positions equally spaced at circumferencial direction are provided with the 2nd jut 7002, are manufactured with the groove (stream) 7003 of axis direction between the 2nd jut 7002 that adjoins each other.In addition, cut, produce groove (stream) 7003 by bight with base portion 700.These grooves (stream) 7003 combines with space 75, perhaps space 75 enlarged, and outgate 900 sides successfully are communicated with communication paths 50 (52) sides.
Pay close attention to the inner side (medial lip 701 and lateral lip 702 extend the side of a side) of the base portion 700 of seal ring 70 here.Be provided with the convex camber 7005 of the wall thickness of medial lip 701 1 sides that make base portion 700 axis directions greater than the wall thickness of lateral lip 702 1 sides in this side.This convex camber 7005 spreads all over the full weeks in week in the base portion 700, compares with the situation that convex camber 7005 is not set, the center of oscillation that makes medial lip 701 on axis direction to the side shifting of the 2nd end 20b.For example, the wall thickness near lateral lip 702 parts of base portion 700 axis directions is roughly the degree of 1mm, and in contrast to this, near the wall thickness medial lip 701 roots is roughly 1.5mm.Therefore, owing to be provided with convex camber 7005, the physical length of medial lip 701 lips is reduced more than the 0.5mm.And, because the convex camber 7005 that becomes one, compare with the situation that this convex camber 7005 is not set, the center of oscillation of medial lip 701 is to the side shifting of the 2nd end 20b, and, lip is in the inboard very difficult distortion that produces of radial direction, therefore, when the seal ring 70 with convex camber 7005 is subjected on every side the hydraulic pressure influence of change, space 75 is narrowed down significantly, outgate 900 sides and communication paths 50 (52) sides are under the off working state at master cylinder 10, can be communicated with by space 75 reliably.Therefore, can prevent the generation of excess pressure effectively.As a result, also can omit a side of the 1st or the 2nd jut.Though the section form of convex camber 7005 is chevrons,, also can change its height or shape according to the hardness of seal ring 70.Mainly be not allow medial lip 701 cause space 75 to narrow down excessively because of the hydraulic pressure that changes is out of shape excessively.
Fig. 8 shows another form of the seal ring that prevents excess pressure effectively.The the 1st or the 2nd jut the 7006, the 7002nd of base portion 700 inner peripheral surfaces shown in Figure 8 makes the form of the roughly the same lifting of internal diameter of base portion 700.According to this form, the 1st or the 2nd jut the 7006, the 7002nd, the structure of swelling with point-like from the surface of base portion 700, therefore, base portion 700 is difficult to distortion, by means of forming the failure-free stream between each jut 7006,7002.For example, 8 the 1st juts 7006 equally spaced are set, in addition, 16 the 2nd juts 7002 equally spaced are set at circumferencial direction at circumferencial direction.But as above-mentioned, two juts 7006,7002 are observed preferably phase non-overlapping copies from axis direction.Such configuration can be guaranteed effective stream, and also is good aspect seal molding.
Claims (10)
1. plunger-type master cylinder comprises: have from the 1st end that mouth opens wide along axis direction and extend to the cylinder hole of mouthful osed top the 2nd end and be communicated to the cylinder body of the communication paths of tank side; Be entrenched in the cylinder hole of this cylinder body, the side in described mouthful osed top the 2nd end marks off hydraulic pressure chamber, the piston that moves along described axis direction; Be positioned at a side of described cylinder body, be used for, have base portion and the medial lip that extends to a side of described hydraulic pressure chamber respectively from the interior outer peripheral portion of this base portion and the seal ring of lateral lip the sealing of the periphery of described piston; And a side that is in described piston, as with described communication paths and the path that described hydraulic pressure chamber is communicated with, make the opening of this path be positioned at the outgate of the periphery wall of described piston, the feature of this plunger-type master cylinder comprises following each feature:
Feature 1. is provided with from described axis direction and sees the 1st edge from the 2nd edge of described the 2nd end side of described outgate opening to described the 1st end side of described outgate opening at least on the outer peripheral face that is in described piston, and then part to set a distance is arranged from the 1st edge of this outgate opening to described the 1st end side of distance, and spread all over all recesses of described piston circumferencial direction;
The medial lip of feature 2. described seal rings is to be in the diameter of the diameter of free-ended leading section one side less than the root of described base portion one side, therefore, described seal ring is on the week of the seal junction that combines with the periphery wall face sealing of the described piston leading section that is positioned at the little described medial lip of diameter, and, the periphery wall of interior week of described medial lip and described piston, be provided with described recess the space that combines, described outgate is communicated with described communication paths from the sealing joint portion to described root;
The seal junction of the medial lip leading section of feature 3. described seal rings when described master cylinder is in off-position, is positioned at the part of the outgate opening of the described piston side on the described axis direction.
2. according to the master cylinder of claim 1 record, it is characterized in that, the seal junction of described seal ring medial lip, carrying out along with the work of described master cylinder, the edge of described the 1st edge one side in the described outgate opening edge of crosscut only, with than the 1st edge near the periphery wall face sealing of the described piston of described the 1st end combine.
3. according to the master cylinder of claim 1 record, it is characterized in that, also comprise following characteristics 4:
Feature 4. described seal rings are between the described root and described seal junction on the inner peripheral surface of described medial lip, be provided with from the inner peripheral surface of described medial lip the 1st jut to the outer peripheral face protuberance of described piston, the 1st jut is provided with to devices spaced apart a plurality of in a circumferential direction, thereby, be provided with the stream of axis direction between the 1st adjacent in a circumferential direction jut.
4. according to the master cylinder of claim 3 record, it is characterized in that, described seal ring also is provided with the 2nd jut at more described the 1st jut on the inner peripheral surface of described medial lip near on the position of base portion, the 2nd jut also is provided with the 2nd stream that is provided with axis direction between the 2nd a plurality of, the adjacent in a circumferential direction juts in a circumferential direction.
5. according to the master cylinder of claim 4 record, it is characterized in that described the 1st jut and described the 2nd jut are configured to when axis direction is observed, each jut does not overlap each other.
6. according to the master cylinder of claim 1 record, it is characterized in that, also comprise following characteristics 5:
Feature 5. described seal rings can with described medial lip with described root be the center to radially inner side and outside the mode of side oscillation be out of shape, and on described base portion, the inner side of one side of extending at described medial lip and described lateral lip, be provided with the bump of the wall thickness of medial lip one side that makes described base portion axis direction greater than the wall thickness of described lateral lip side, compare with the situation that this bump is not set, the center of oscillation of described medial lip is positioned at the position of approaching described the 2nd end one side on the axis direction.
7. according to the master cylinder of claim 1 record, it is characterized in that described seal junction constitutes by spreading all over the protuberance in full week on the described medial lip leading section.
8. according to the master cylinder of claim 1 record, it is characterized in that the partial sum of periphery wall in the recess that is in described piston periphery that the described piston of tight connection is carried out in described seal junction crossed between the part of close described the 1st end of this recess.
9. according to the master cylinder of claim 1 record, it is characterized in that described cylinder body has from axis direction and sees the part that is led in the recess front and back of described piston respectively, is used for the mobile of described piston led.
10. according to the master cylinder of claim 1 record, it is characterized in that, on the internal perisporium face in the cylinder hole of described cylinder body, be provided with the mounting groove that is used to assemble, install described seal ring, described seal ring is in the described mounting groove, described base portion enters in this mounting groove, and the seal junction of the leading section of described medial lip is outwards outstanding from this mounting groove.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP118944/2003 | 2003-04-23 | ||
| JP2003118945 | 2003-04-23 | ||
| JP118945/2003 | 2003-04-23 | ||
| JP118943/2003 | 2003-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1777529A true CN1777529A (en) | 2006-05-24 |
Family
ID=36766617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480010751 Pending CN1777529A (en) | 2003-04-23 | 2004-04-21 | Plunger-type master cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1777529A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092378A (en) * | 2009-11-20 | 2011-06-15 | 株式会社万都 | Sealing element used for main cylinder and main cylinder provided with sealing element |
| CN101134460B (en) * | 2006-08-31 | 2011-12-14 | 株式会社日立制作所 | Master cylinder, master cylinder body, and method for producing master cylinder |
| CN101909958B (en) * | 2008-01-22 | 2013-11-06 | 韩国德尔福汽车***公司 | Master cylinder for a vehicle |
| CN103813951A (en) * | 2011-09-06 | 2014-05-21 | 克诺尔-布里姆斯轨道车辆***有限公司 | Control valve seal and control valve comprising control valve seal |
| CN104470776B (en) * | 2012-07-19 | 2017-03-15 | 卢卡斯汽车股份有限公司 | Master cylinder for the pressure piston with configuration profile of automobile braking system |
| CN107000719A (en) * | 2014-11-28 | 2017-08-01 | 怡来汽车零部件***株式会社 | The master cylinder of vehicle |
| CN109476294A (en) * | 2016-10-04 | 2019-03-15 | 日立汽车***株式会社 | Master cylinder |
-
2004
- 2004-04-21 CN CN 200480010751 patent/CN1777529A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134460B (en) * | 2006-08-31 | 2011-12-14 | 株式会社日立制作所 | Master cylinder, master cylinder body, and method for producing master cylinder |
| CN101909958B (en) * | 2008-01-22 | 2013-11-06 | 韩国德尔福汽车***公司 | Master cylinder for a vehicle |
| CN102092378A (en) * | 2009-11-20 | 2011-06-15 | 株式会社万都 | Sealing element used for main cylinder and main cylinder provided with sealing element |
| CN103813951A (en) * | 2011-09-06 | 2014-05-21 | 克诺尔-布里姆斯轨道车辆***有限公司 | Control valve seal and control valve comprising control valve seal |
| CN103813951B (en) * | 2011-09-06 | 2016-10-05 | 克诺尔-布里姆斯轨道车辆***有限公司 | Control valve sealing member and the control valve being furnished with this control valve sealing member |
| CN104470776B (en) * | 2012-07-19 | 2017-03-15 | 卢卡斯汽车股份有限公司 | Master cylinder for the pressure piston with configuration profile of automobile braking system |
| CN107000719A (en) * | 2014-11-28 | 2017-08-01 | 怡来汽车零部件***株式会社 | The master cylinder of vehicle |
| US10252706B2 (en) | 2014-11-28 | 2019-04-09 | Erae Ams Co., Ltd. | Master cylinder for vehicle |
| CN109476294A (en) * | 2016-10-04 | 2019-03-15 | 日立汽车***株式会社 | Master cylinder |
| CN109476294B (en) * | 2016-10-04 | 2022-06-03 | 日立安斯泰莫株式会社 | Master cylinder |
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