CN102971549B - The protection sheath of disc brake piston-piston-cylinder unit - Google Patents

Abstract

Provide the protection sheath of disc brake piston piston-cylinder unit.This protection sheath may be arranged in collapsed state and extended configuration; piston has the outer surface being suitable to coordinate with cylinder surfaces, and described outer surface has predetermined piston diameter, and cylinder surfaces has predetermined cylinder bore; wherein, piston includes piston only and head.This sheath includes: sheath body, and in the collapsed state of piston, this sheath body is the disk-shaped structure extending to external diameter from internal diameter；Described external diameter is more than described cylinder bore；Described internal diameter is less than piston diameter；First shackle, arranges along outer diameter sheath, is adapted to secure to caliper body；Second shackle, along sheath internal diameter arrange, be adapted to secure to piston；Multiple wrinkle, are folded such that its surface region be directly facing each other, and allow sheath to extend during the cylinder of caliper body moves out at piston.Additionally provide the piston being combined with this flexible shroud and the clamp being combined with this piston.

Description

The protection sheath of disc brake piston-piston-cylinder unit

The present invention relates to flexible shroud, it is also designed to dust cover, can be at disc type brake for protection The piston-cylinder unit used in device.

Generally, in disk brake, by being arranged in suitable clamp (caliper) and including cylinder Piston-cylinder unit produce braking maneuver, piston can slide in the cylinder such that it is able to by rotation Liner (pad) on the apparent surface of rotating disk and work.

Typically, piston-cylinder unit is provided with flexible shroud, and this flexible shroud is used for preventing outside (such as, dust, dirt, dampness, they may stop piston dynamic in braking for material and/or caustic Suitably slide in cylinder during work, and/or cause the corrosion of the slidingsurface of piston and cylinder) Penetrate into cylinder and piston (particularly its slidingsurface).

Currently used flexible shroud is bellows form, and by its one end being fixed on piston week Enclose and the other end is fixed on around cylinder and at cylinder opening, surround piston-cylinder unit to provide Protective barrier, thus and it is applied to piston-cylinder unit.

When during flexible protective sheaths remains static or when being installed in disk brake (wherein, piston is fully located in cylinder, situation about such as unworn liner occurring), it is adopted Using such structure, according to this structure, its several being partially around is gone up each other, to provide a circle or many Circle (or wrinkle (fold)).It is noted that when flexible shroud is arranged on disk brake, These wrinkle have a convex surface towards liner, specifically towards the gripper shoe of friction washer of liner.By In the abrasion of liner friction washer, piston stretches towards disc, and flexible shroud is elongated, so that Their own is adapted to the new position occupied by piston.

It is known that in order to provide the disk brake with flexible protective sheaths, need suitably Seat portion accommodate sheath, particularly accommodate its wrinkle, when it is in collapsed state, such as, place Time in non-wear washer state, in a state, piston is completely accommodated in cylinder.

It is also known that this portion is arranged in cylinder, piston, the interface of liner can cause total chi Very little increase, this is because, owing to brake caliper size is equal, so, when piston is complete When being contained in cylinder, need between liner and piston, leave suitable gap, and it is further desired that There is between piston and cylinder side body.Therefore, the overall size of brake caliper increases, to pass through Flexible protective sheaths provide housing to guarantee the same performance of clamp.

Known from EP1340001 patent between cylinder and liner, keep suitable interval, in order to When protecting sheath to pack up, protection sheath is contained in this space.

Accordingly, it would be desirable to increase the overall size of brake caliper, thus this housing can be arranged in clamp.

As known to from US4809821 patent, can wait to hold to being formed near cylinder and piston head The wrinkle being contained in flexible shroud therein arrange suitable annular groove.

But, it was observed that, this solution can make the stop cross section (resisting section) of cylinder Die down, and thus make the stop cross section of caliper body die down, thus reduce rigidity, and the most usual Reduce its performance.

At US4, in 524,677 patents, it is proposed that a kind of similar solution proposed with US4809821 Certainly scheme, wherein, is contained in flexible shroud in the annular seats being arranged in caliper body.

But, the most in this case, housing can damage the material of composition caliper body, thus causes The mechanical property (such as, its stiffness) of assembly is deteriorated.

The key issue of the present invention is to propose a kind of housing for flexible shroud, and this flexible shroud is used for The piston-cylinder unit that protection can use in disk brake, this housing is not above with reference to existing The shortcoming that technology is mentioned.

According to a general embodiment, for protecting the piston-cylinder unit of disk brake Flexible shroud can be arranged in collapsed state (wherein, piston is completely accommodated in cylinder), and cloth Put in extended configuration (wherein, piston is fully drawn out), described work from the caliper body limiting cylinder Plug has the outer surface of piston that the cylinder surfaces of the caliper body be suitable to and accommodate piston coordinates, described Outer surface has predetermined piston diameter, and described cylinder surfaces has predetermined cylinder bore, Wherein, described piston includes piston only and the head being adapted to press against on the liner of disk brake, this Sheath includes:

-sheath body, it uses the structure of substantially dish type in collapsed state, the structure of this dish type External diameter is extended to from internal diameter；

-described external diameter is more than described cylinder bore；

-described internal diameter is less than piston diameter, and limits and extend to described piston diameter from described internal diameter Jacket portions；

-the first shackle, arranges along outer diameter sheath, and is adapted to secure to caliper body；

-the second shackle, the internal diameter along sheath is arranged, and is adapted to secure to piston；

-multiple wrinkle, are formed by the wrinkle limited by each several part of described sheath body, described many Individual wrinkle are folded into and make its surface region be directly facing each other, and are adapted to allow for sheath at piston from caliper body Cylinder stretches during moving out.

Preferably, the plurality of wrinkle are fully disposed in the described sheath extending to piston diameter from internal diameter In part.

According to a general embodiment, disc brake piston is suitable to by the clamp of disk brake Body cylinder accommodates, and is suitable for being pressed on brake rim, and described piston has and is suitable to and accommodates piston The outer surface of piston that the cylinder surfaces of caliper body coordinates, it is straight that described outer surface has predetermined piston Footpath, and described cylinder surfaces has predetermined cylinder bore, and wherein, described piston includes piston Body and the head being adapted to press against on liner, this piston includes:

-sheath shell, is arranged on piston crown, has housing wall portion, is suitable for directly facing cylinder The first opening and be suitable for directly facing the second opening of brake rim,

-described piston is suitable to be associated with the sheath with multiple wrinkle, and the plurality of wrinkle are by described The each several part of sheath is formed, and the plurality of wrinkle are folded such that its surface region be directly facing each other, and Sheath is allowed to stretch during caliper body cylinder moves out at piston.

Preferably, this sheath shell is suitable to accommodate completely the plurality of wrinkle of sheath.

According to a general embodiment, the clamp of disk brake include being contained in disk brake Caliper body cylinder in piston, can be pressed on brake rim, described piston have with accommodate The outer surface of piston that the inner surface of the caliper body cylinder of piston coordinates, described outer surface has predetermined Piston diameter, and described cylinder surfaces has predetermined cylinder bore, wherein, described piston bag Including piston only and the head can being pressed on liner, these clamp include:

-sheath shell, is arranged on piston crown, has housing wall portion, region be directly facing the of cylinder One opening and region be directly facing the second opening of brake rim,

-described piston is associated with the sheath with multiple wrinkle, and the plurality of wrinkle are by described sheath Each several part formed, the plurality of wrinkle are folded such that its surface region be directly facing each other, and allow Sheath stretches during caliper body cylinder moves out at piston.

Preferably, this sheath shell accommodates the plurality of wrinkle of sheath completely, from without being used for The housing being arranged in caliper body of multiple wrinkle.

With reference to accompanying drawing, it is considered real to symbolic and nonrestrictive preferred illustrative from given below Executing in the description of mode, other features and advantages of the present invention will be apparent to, in accompanying drawing:

Fig. 1 is the shaft side projection drawing of the disk brake according to the present invention；

Fig. 2 is the partial cross plane graph of the disk brake according to the present invention；

Fig. 3 is another part sectional plain-view drawing of the disk brake according to the present invention, wherein at piston In the operating mode different from Fig. 2；

Fig. 4 is the amplifier section of the disk brake in Fig. 2；

Fig. 5 is the amplifier section of the disk brake in Fig. 3；

Fig. 6 is the shaft side projection drawing of the flexible shroud according to the present invention；And

Fig. 7 is another shaft side projection drawing of the flexible shroud of Fig. 6.

According to a general embodiment, for protecting the piston-cylinder unit of disk brake Flexible shroud 100 may be arranged in collapsed state and in extended configuration, this flexible shroud includes:

-sheath body 100, extends to outer diameter D e from internal diameter Di, and limit axial direction I-I and Radial direction that axial direction is orthogonal and circumferential direction.

According to an embodiment, described sheath body includes arranging along outer diameter D e of sheath 100 The first shackle 101, it is prominent in the axial direction and is adapted to secure to caliper body 4.

According to an embodiment, described sheath body includes arranging along the internal diameter Di of sheath 100 The second shackle 102, it is prominent in the axial direction and is adapted to secure to piston 10.

According to an embodiment, described sheath body includes the sheath section extended from described internal diameter Di Divide Pg.

According to an embodiment, described sheath body includes multiple wrinkle 114, these wrinkle and institute State the second shackle 101 separate and formed by the wrinkle limited by each several part of described sheath body, this A little wrinkle are folded such that its surface region be directly facing each other, and allow sheath 100 piston 10 from The cylinder 9 of caliper body 4 stretches during moving out.The plurality of wrinkle 114 are all arranged In described jacket portions Pg that internal diameter Di extends.

According to an embodiment, described sheath body includes the first shackle 101 is connected to multiple folding The connection band 115 of wrinkle 114.Advantageously, described connection is keeping concordant with the packing ring packed up with 115 While fully extend, or the most fully extend in the way of disc.

According to an embodiment, multiple wrinkle 114 extend predetermined of wrinkle in radial directions One extension or radial extension.

According to an embodiment, connect band 115 and extend in radial directions and connect predetermined the carried Two extensions or radial extension.

According to an embodiment, described the second predetermined extension is equal to or more than described predetermined the One extension.

According to an embodiment, the plurality of wrinkle 114 extend wrinkle on axial direction I-I The 3rd predetermined extension or axially-extending portion.

According to an embodiment, described first shackle 101 extends the first hook on axial direction I-I The 4th predetermined extension or the axially-extending portion of ring.

According to an embodiment, described the 4th predetermined extension is more than or equal to described predetermined the Three extensions.

In Fig. 1, Fig. 2 and Fig. 3, it is shown that be suitable to the disc type acting on the brake band of disc 2 Brake 1, especially for motor vehicles (not shown).

According to the particular instance shown in Fig. 1, disk brake 1 is fixed caliper type, but, It is can also be applied to different types of disk brake, such as, floating caliper disc brake.

Disk brake 1 includes: disc 2, is suitable to the wheel with motor vehicles and is associated；And bag Include the clamp 3 of caliper body 4.

It is adapted to secure to the caliper body 4 of the spline (splinder) of suspension of motor vehicle, including first With the second half bodies 16,40, they face each other are also arranged in relative relative to disk brake On part.

Two half-unit body 16,40 can be threaded connection device and be connected with each other, or caliper body A component can be fabricated to.

Caliper body 4 has the first bridging element 6 and the second bridging element 7, the first bridging element and Second bridging element is substantially U-shaped, arranges across disc 2, and lays respectively at disk brake On the right side of the axis I-I of 1 and left side.Additionally, be formed with two in caliper body 4 for accordingly The casing base portion 11 and 12 of liner 13 and 14.Liner 13 and 14 includes for corresponding friction The relevant gripper shoe 25 and 26 of packing ring 35 and 36.

In examples detailed above embodiment, every in the two half-unit body 16,40 of caliper body 4 One all includes two piston-cylinder units 19, the most only it can be seen that one of them. Each piston-cylinder unit 19 includes: limits the hydraulic cylinder 9 of axis a-a in inside and has face To the part 45 of the opening 27 in seat portion 12 and have the piston 10 of head 29, this piston can be Axially slide in cylinder 9, with movable on liner 14.

According to an embodiment, described piston 10 has the caliper body 4 being suitable to accommodating piston Cylinder surfaces 9 coordinate outer surface of piston, described outer surface has predetermined piston diameter Dp, And described cylinder surfaces 9 has predetermined cylinder bore Dc.

According to an embodiment, the piston 10 of cylinder shape has piston diameter Dp, this piston diameter Define along with the axes intersect of piston and be perpendicular to a straight line of this axis piston outer surface it Between distance.Similarly, cylinder 9 has cylinder bore Dc, and this cylinder bore defines along process The axis a-a of cylinder and be perpendicular to the straight line of the axis a-a distance between the outer surface of cylinder.

In the way of completely conventional for being supplied to the brake fluid of cylinder 9, at caliper body 4 Passage is inside set.Cylinder 9 is provided with the annular groove 18 for seal washer 28 of traditional type.

Additionally, piston-cylinder unit 19 is provided with flexible shroud 100, this flexible shroud is used for preventing Any exterior materials and/or caustic penetrate into cylinder 9 and the particularly corresponding slidingsurface of piston 10().

According to an embodiment, sheath 100 is dish type in collapsed state, and from internal diameter Di Extend to outer diameter D e.

According to an embodiment, outer diameter D e of sheath 100 is more than cylinder bore Dc, and protects The internal diameter Di of set 100 is less than piston diameter Dp.

This flexible shroud 100 has the shape of bellows type, and has winding arrangement, when it is quiet Time only or when connected piston 10 is positioned at cylinder 9, this structure includes one or more folding Wrinkle (or circle).Additionally, when piston 10 flexes outward towards disc 2 from cylinder 9, flexibility is protected Overlap 100 extending, until it obtains the substantially cylinder-shaped or shape of truncated cone shape.

Especially, be in news at liner 13 and 14, i.e. when friction washer 35,36 not During abrasion (such as, be figure 4 illustrates by example), flexible shroud 100 uses winding arrangement, And when piston 10 stretches due to the abrasion of friction washer 35,36, flexible shroud 100 extends. Fig. 5 shows a part for the disk brake of the Fig. 3 being in following state, wherein, piston 9 Forward extend out due to the most completely worn out of friction washer 35,36.It should be observed that, Fig. 5's In diagram, flexible shroud 100 in a linear fashion in cylinder 9 and piston 10 in two anchor points Between stretch, but, in the case of the piston 9 turned forward, flexible shroud 100 also can pass through There is such as waveform configuration and stretch.

In figure 6 and figure 7, it is shown that the flexible shroud when flexible shroud 100 is in winding arrangement Phantom.

Flexible shroud 100 has in its one end and is intended to be fixed to limit the first of the part 45 of cylinder 9 Annular region or the first shackle 101, and there is the second annular being intended to be fixed to piston 10 in opposite end Region or the second shackle 102.

In order to allow fixing flexible sheath 100, part 45 is provided with receiving the first ring at opening 27 The groove 20 of 101, and piston 10 be provided with at head 29 accommodate the second ring 102 groove 21. Such as, shackle 101 and 102 has the thickness and shape that can engage in groove 20 and 21, recessed The shape that groove has is to guarantee the fixing of flexible shroud 100.In any situation, can use any Other suitable devices for flexible shroud 100 being fixed to piston-cylinder unit 19.

Additionally, in part 45, at opening 27, be provided with optional toroidal shell 22, with When flexible shroud is in winding arrangement, accommodate at least some of of flexible shroud 100.

Flexible shroud 100 has outer surface 103 and an inner surface 104, and includes multiple having concentric ring The part of shape band, described endless belt is connected to each other, and has the diameter of various sizes.

According to an embodiment, flexible shroud includes that the first shackle 101 connecting sheath 100 is with many The connection band 115 of individual wrinkle 114.

According to an embodiment, the second shackle 102 has and intersects along the axis a-a with cylinder 9 The cross section of sagittal plane, including the several protuberances contacted with the groove 21 of piston.

Advantageously, the protuberance of the second shackle 102 allows to reduce the surface with piston contact, in order to subtract Few heat transfer to sheath, thus extend the life cycle of sheath.

According to an embodiment, multiple wrinkle 114 constitute the extendable portion of sheath 100, to work as When piston stretches out outside cylinder 9, sheath is made to stretch together with piston 10.

Especially, connect in band 115 is intended to a portion that is contained in 22 and be radially disposed, i.e. when During to piston-cylinder unit 19 application flexibility sheath 100, connect band and be positioned at the axis a-a with cylinder 9 Substantially orthogonal to plane in.

First shackle 101 is connected with the first wrinkle 108 of multiple wrinkle 114 by this connection with 115.

These first wrinkle 108 are connected with the second wrinkle 109, the second wrinkle 109 and the second shackle 102 Connect.

According to an embodiment, the first wrinkle 108 and the second wrinkle 109 are along the axle with cylinder 9 The sagittal plane that line a-a intersects has U-shaped cross section, in order to each several part is constituted region be directly facing each other These wrinkle that mode folds.

According to an embodiment, the first wrinkle 108 and the second wrinkle 109 have relative to each other base The part of 180 ° is folded in basis.

According to an embodiment, form multiple wrinkle 114 by each several part of described sheath body Each wrinkle, these wrinkle are folded into and make its surface region be directly facing each other, and allow sheath 100 to exist Piston 10 stretches during the cylinder 9 of caliper body 4 moves out.

These wrinkle are folded such that the outer surface 103 of sheath 100 region be directly facing the folding of inner surface 104 Wrinkle part.

First wrinkle 108 and the second wrinkle 109 are respectively provided with two annular convex surface 111 and 112, it Be connected to each other by loop concave 113.

It should be observed that, one or more parts of outer surface 103 can be made towards liner 14, i.e. Make these parts towards this liner, especially, when to piston-cylinder unit 19 application flexibility sheath When 100, towards the wall portion 30 of plate 25.Especially, as shown in Figure 4, annular convex surface 111 can be made With 112 towards liner 14.

Advantageously, flexible shroud 100 is provided with at least one spacer element 105,105 ', described between Allow to keep at least some of of surface 103 being properly separated from liner 14 every element, particularly with The wall portion 30 of plate 25 separates.

In the example of accompanying drawing, spacer element 105 is arranged in annular convex surface 111 and connects at band 115.

Advantageously, spacer element 105 is intended to by between outer surface 103 and plate 25 and wall Portion 30 contacts, thus avoids each several part (such as, the annular convex surface of described plate and flexible shroud 100 111 and connect band 115) between directly contact, thus allow reduce due to braking action generation Heat exchange between liner 14 and flexible shroud 100.

According to an embodiment, spacer element 105 includes being arranged in and connects with other on 115 Every element 105 ', these other spacer elements are to be arranged at the projection on the outer surface 103 of sheath 100 Form be arranged in connection band 115 on.

According to an embodiment, these other spacer elements 105 ' are the shape of linear protrusion, tool There is radial direction and be spaced apart, being arranged in connection with on the surface of 115.

Advantageously, in addition to avoiding connecting the above-mentioned advantage that band directly contacts with liner 14, arrange In connect with 115 on spacer element 105 by assuring that the flatness on its surface and guarantee connect carry The rigidity of 115.

According to an embodiment, these spacer elements 105 are the protuberance being arranged in sheath 100, And can have variously-shaped.About this point, it should be appreciated that according to an embodiment, those make Contact surface between these projection and wall portions 30 of plate 25 is minimized (it is desirable that be reduced to one Individual point) shape be particularly suitable for this purpose.In figure 6, the interval in annular convex surface 111 it is positioned at Element 105 is the projection substantially with spherical dome shape, and is positioned at the interval connected with on 115 Element 105 is to be arranged in this appropriately apart from each other with on the surface 103 of 115 in radial directions Protruding.

According to an embodiment, sheath 100 can include being only located at the spacer element connected with on 115 105, separate with liner 14 so that connecting band and avoid damaging sheath.On the other hand, sheath 100 Remainder causes separating with thermal source, because it is contained in the seat portion of piston 10, and following institute State.

But, other shapes in addition to those shown herein shape can be used, such as, cut rib Cone-shaped or irregular section (it extends the most in one or more directions).

Can obtain the flexible shroud 100 being provided with spacer element 105 in a conventional manner, such as, By being expelled to be provided with in the mould of cavity by melted material, this cavity has and is in winding arrangement In the contrary structure of sheath.Sheath typically resisted by the material that can be used for manufacturing flexible shroud 100 Suffered brake fluid and the type of temperature.Preferably, in braking procedure, accessible temperature increases Time, in order to manufacture flexible shroud 100, SBR(butadiene-styrene rubber can be used), EPDM(EPDM Rubber) or silicone rubber and NBR rubber (butadiene acrylonitrile), with said sequence, it is used for depositing In the environment of mineral oil.

As it has been described above, flexible shroud 100 is shaped such that, when it is static, it has and works as application Winding arrangement identical (in the case of new liner 13 and 14) when piston-cylinder unit 19.

According to an embodiment, with reference to Fig. 4, piston 10 includes sheath shell 31, this sheath shell Body is arranged as the annular groove including accommodating the identical piston of the groove 21 of the second shackle 102.

When protecting sheath to be in stowed position in described groove, such as, this sheath shell 31 base Whole protection sheath 100 is accommodated in basis.

According to an embodiment, this sheath shell 31 is arranged on the head 29 of piston 10, with Just first wrinkle the 108, second wrinkle 109 constituting multiple wrinkle 114, and the second shackle are accommodated 102。

According to an embodiment, sheath shell 31 accommodates a part for protection sheath 100, this portion Divide the length including that those mutually fold on itself, to be substantially facing each other, and be adapted to allow for Sheath 100 extends as follows, in order to even all protect piston-cylinder list when piston 10 stretches Unit 19.

Length 100 is folded into the statement that region be directly facing each other and means they face each other, at it Any other material part, such as, the material part of piston 10 or caliper body 4 is not had between.

In other words, packing up in the case of sheath, sheath shell 31 includes whole jacket portions 100, These jacket portions are in folding over each other so that the outer surface 103 of sheath 100 is towards sheath 100 Inner surface 104.

According to an embodiment, multiple wrinkle 114 are all arranged in and extend to piston from internal diameter Di In the jacket portions of diameter Dp, and, the plurality of wrinkle 114 are suitable to be contained in and are arranged at piston In the seat portion compressed in head 29 of 10.

According to an embodiment, this sheath shell 31 includes lower surface 32, and this lower surface is towards lining Pad 14 and be substantially perpendicular to the axis a-a of piston 10, from the appearance towards cylinder 9 of piston 10 Face extends to groove 21.

Additionally, described sheath shell 31 includes bottom surface 33, this bottom surface is also the bottom surface of groove 21, This bottom surface is vertically arranged with lower surface 31, and from the beginning of lower surface, hook-shaped convex with groove 21 Play the point of intersection termination of 34.

According to an embodiment, this hooked projection 34 is perpendicular to the axis a-a of piston 10 from bottom surface 33 highlight, and are positioned partially in sheath shell 31.

Especially, hooked projection 34 includes towards the hook-shaped surface 37 of groove 21 and relative adjoining Surface 38, this abutment surface is the part on the surface of the head 29 of piston 10 and adjacent with liner 14 Connect.

According to an embodiment, sheath shell 31 include housing wall portion, towards cylinder 9 first Opening 41 and the second opening 42 towards liner 14, so as to accommodate sheath 100, and permit Permitted sheath and arrived its of piston 10 by the groove 20 being wherein disposed with the first shackle 101 of cylinder 9 In be disposed with the groove 21 of the second shackle 102.

According to an embodiment, packing up in the case of sheath 100, the connection band of sheath 100 In 115 toroidal shells 22 being contained in the caliper body 4 limiting cylinder 9, in order to be substantially perpendicular to The axis a-a of piston 10 and extend, the first shackle 101 is contained in the First portion 20 of cylinder 9, And the remainder of sheath 100 is contained in the sheath shell 31 of piston 10.

According to an embodiment, sheath shell 31 includes wrinkle seat portion 23, and this wrinkle seat portion is complete Accommodating multiple wrinkle 114, this portion opens on both sides, and wherein side is suitable to towards liner 14, separately Side is suitable to when piston 10 is completely accommodated in cylinder 9 towards cylinder 9, and, housing 31 enters One step is included in the groove 21 of the undercutting caliper body 4 opened on side, and only this side is to the first wrinkle Seat portion 23, and be suitable to comprise the second shackle 102 of sheath 100.

Advantageously, sheath shell 31 allows to reduce the overall size of caliper assembly in being arranged in piston 10, This is because, owing to sheath 100 is fully accommodated in described sheath shell 31, so need not Suitable seat portion is arranged between piston-cylinder and liner.

Advantageously, because sheath shell 31 is arranged in piston 10, so can avoid increasing cylinder 9 The opening 27 towards liner 14 and liner 14 between distance so that this distance with do not use guarantor It is substantially the same that the clamp of the disk brake of sheath 100 are used.

Advantageously, because sheath shell 31 is arranged in piston 10, so can avoid at cylinder 9 A portion is inside set and accommodates the sheath 100 packed up, to avoid the stop cross section of cylinder to die down, Yi Jiyou This is avoided the stop cross section of caliper body to die down, and dies down its rigidity of reduction, and thus reduces its performance.

Advantageously, in order to avoid sheath shell 31 may reduce the mechanical property of piston 31, piston can It is made up of the material with higher mechanical property so that in spite of providing housing 31, if size Equal, then piston efficiency is identical.

Especially, the material being used for manufacturing piston 10 can be in addition to for manufacturing caliper body 4 Material beyond material, thus use the most when needed and there is higher mechanical property and the most expensive Material.

According to an embodiment, protection sheath 100 includes the outlet arranged along the first shackle 101 117, to allow air during being arranged on piston-cylinder unit 19 by protection sheath 100 Flow out.

According to an embodiment, outlet 117 is the shape in semi-cylindrical nest portion, has and piston The axis parallel for axis a-a of 10, is arranged on the inner surface 104 of the first shackle 101.

In other words, what these outlets 117 were arranged in the first shackle 101 is suitable to the groove at cylinder 9 On surface adjacent in 21.

According to an embodiment, the first shackle 101 includes the metal being arranged in the first shackle 101 Ring bracing means 116, to guarantee rigidity, mechanical resistance and shape to dust cover sheath 100.

Especially, becket bracing means 116 causes being immersed in the material constituting protection sheath 100, Particularly constitute the material of the first shackle 101.

Advantageously, this becket bracing means 116 is easy to be hooked on cylinder 9 sheath 100, and really Protection correctly positions in being enclosed within its whole life cycle, thus when sheath is by from disk brake The heat of operation time, it is to avoid any warpage of sheath.

For the embodiment of said apparatus, in order to meet possible demand, those skilled in the art can To be changed on the premise of without departing substantially from scope of the following claims, to adapt to, and use other functions The element of equivalent replaces.Can perform to belong to possible reality independently with other embodiments described herein Execute each described characteristic of mode.

Such as, the flexible shroud 100 being used for protecting the piston-cylinder unit of disk brake can be such Arrange so that it is one end is fixed to limit the piston only 4 of cylinder 9, and opposite end is fixed to piston 10, With avoid foreign particle possibly into piston-cylinder interface, wherein, in collapsed state, piston 10 Being completely accommodated in cylinder 9, in extended configuration, piston 10 is from the caliper body 4 limiting cylinder 9 Be fully drawn out, described piston 10 have the respective surfaces towards cylinder 9 exterior cylindrical surfaces and Constituting the surface of the one end of the cylindrical surface being adapted to press against on liner 14, wherein, piston is in addition Cylindrical surface and this end face limit substantially cylindrical in shape piston overall size volume, this sheath 100 include:

The sheath body 100 of-substantially dish type, extends to outer diameter D e from internal diameter Di；

-the first shackle 101, outer diameter D e along sheath 100 is arranged, is adapted to secure to clamp originally Body 4；

-the second shackle 102, remaining internal diameter Di along sheath 100 arranges, is adapted to secure to live Plug 10；

-multiple wrinkle 114, are formed by the wrinkle limited by each several part of described sheath body, institute State multiple wrinkle and be folded such that its surface region be directly facing each other, and to allow sheath 100 at piston 10 extend during the cylinder 9 of caliper body 4 moves out；

It is characterized in that:

The plurality of wrinkle 114 are all arranged in this jacket portions, in piston is in stowed position Time, the plurality of wrinkle are suitable to be arranged in the overall size volume of piston.

Claims (14)

1. the flexible shroud being used for protecting the piston-cylinder unit of disk brake, it is possible to be arranged in In collapsed state, and being arranged in extended configuration, this sheath includes:

Sheath body, extends radially to external diameter from internal diameter, and limits axial direction with described Radial direction that axial direction is orthogonal and circumferential direction；Described sheath body includes:

First shackle, the external diameter along described sheath is arranged, on described axial direction Highlighting and be adapted to secure to caliper body, described first shackle includes being arranged in described Becket bracing means in one shackle, described becket bracing means is immersed in composition institute State in the material of the first shackle；

Second shackle, the internal diameter along described sheath is arranged, on described axial direction Highlight and be adapted to secure to piston；

Jacket portions, extends from described internal diameter；

Multiple wrinkle, separate with described second shackle and by by described sheath body The wrinkle that each several part limits are formed, and the plurality of wrinkle are folded such that its surface is direct Face each other, and allow described sheath at described piston from the gas of described caliper body Cylinder extends during moving out；The plurality of wrinkle are all arranged in described In the described jacket portions that footpath extends；

Described body includes the connection band that described first shackle is connected to the plurality of wrinkle, Described connection band the most fully prolongs described with the shape of disc Stretch；

Wherein,

The plurality of wrinkle are at described the first predetermined extension extending wrinkle in the radial direction Or radial extension；

Described connection band connects, described extension in the radial direction, the second predetermined extension carried Or radial extension；

And wherein, described the second predetermined extension is equal to or more than described predetermined first Extension.

Flexible shroud the most according to claim 1,

Wherein, the plurality of wrinkle extend predetermined the 3rd of wrinkle on described axial direction Extension or axially-extending portion；

Wherein, described first shackle extends the predetermined of the first shackle on described axial direction 4th extension or axially-extending portion；

And wherein, described the 4th predetermined extension is more than described the 3rd predetermined extension.

Flexible shroud the most according to claim 1, wherein, the plurality of wrinkle are suitable to be contained in It is arranged in the groove compressing in head of described piston, and/or wherein, is provided with connection band, So that described first shackle to be connected to the plurality of wrinkle, and described connection band is straight from cylinder Footpath extends to described external diameter, and wherein, the described connection band of described sheath is suitable to be contained in restriction In the seat portion of the described caliper body of described cylinder, described connection band is radially disposed, with To described piston-cylinder unit apply described flexible shroud time, described connection band be suitable to be positioned at The axis a-a of described cylinder substantially orthogonal to plane in.

Flexible shroud the most according to claim 1, wherein, is provided with at least one spacer element, It is suitable to keep the liner of at least some of of jacket surface and described disk brake suitably Separate.

Flexible shroud the most according to claim 1, wherein, described protection sheath includes outlet, Described outlet is arranged along described first shackle, to allow be arranged on described protection sheath During on described piston-cylinder unit, air flows out.

6., for protecting a flexible shroud for the piston-cylinder unit of disk brake, described flexibility is protected Set can be arranged in piston and be fully accommodated in the collapsed state in cylinder, and is arranged in described Piston from the extended configuration that is fully drawn out of caliper body limiting described cylinder, described piston There is the piston that the cylinder surfaces of the described caliper body be suitable to and accommodate described piston coordinates Outer surface, described outer surface has predetermined piston diameter, and described cylinder surfaces tool Having predetermined cylinder bore, wherein, described piston includes piston only and is adapted to press against described Head on the liner of disk brake, this sheath includes:

Sheath body, it has the substantially dish extending to external diameter from internal diameter in collapsed state The structure of shape；

Described external diameter is more than described cylinder bore；

Described internal diameter is less than piston diameter, and limits that to extend to described piston from described internal diameter straight The jacket portions in footpath；

First shackle, the external diameter along described sheath is arranged, is adapted to secure to described clamp originally Body, described first shackle includes the becket bracing means being arranged in described first shackle, Described becket bracing means is immersed in the material constituting described first shackle；

Second shackle, the internal diameter along described sheath is arranged, is adapted to secure to described piston；

Multiple wrinkle, are formed by the wrinkle limited by each several part of described sheath body, institute State multiple wrinkle and be folded such that its surface region be directly facing each other, and protect described in being adapted to allow for It is enclosed within described piston to extend during the cylinder of described caliper body moves out；

Wherein, the plurality of wrinkle are all arranged in that to extend to described piston from described internal diameter straight In the described jacket portions in footpath.

7. a piston for disk brake, is suitable to be contained in the caliper body of described disk brake In cylinder, can be pressed on brake rim, described piston have be suitable to accommodate described The outer surface of piston that the cylinder surfaces of the described caliper body of piston coordinates, described outer surface There is predetermined piston diameter, and described cylinder surfaces have predetermined cylinder bore, Wherein, described piston includes piston only and is suitable to the head being pressed on described liner, institute State piston to include:

Sheath shell, is arranged on the head of described piston, has housing wall portion, is suitable to directly Junction is to the first opening of described cylinder and is suitable for directly facing the of described brake rim Two openings,

Described piston is suitable to be associated with the sheath with multiple wrinkle, the plurality of wrinkle by The each several part of described sheath is formed, and the plurality of wrinkle are folded such that its surface region be directly facing Each other, and allow described sheath at described piston from the cylinder of described caliper body to outward transport Extend during Dong,

Wherein,

Described sheath shell is suitable to accommodate completely the plurality of wrinkle of described sheath,

Described sheath includes: the first shackle, and the external diameter along described sheath is arranged, axially Side projects upwards and is adapted to secure to caliper body, and described first shackle includes being arranged in described Becket bracing means in first shackle, it is described that described becket bracing means is immersed in composition In the material of the first shackle.

The piston of disk brake the most according to claim 7, wherein, is arranged in described piston Head on described sheath shell be suitable to:

It is positioned at the second opening being suitable for directly facing described brake rim, is constituted institute to accommodate State the first wrinkle of the described sheath of multiple wrinkle, the second wrinkle,

Further, it is positioned at described first opening (41) being suitable for directly facing described cylinder, To accommodate the second shackle (102) allowing that described sheath is fixed to described piston.

9. according to the piston of the disk brake according to any one of claim 7 to 8, wherein, institute State sheath shell to include: the first wrinkle seat portion opened on both sides, wherein side is suitable to face To described liner, and opposite side is suitable to when described piston is completely accommodated in described cylinder Towards described cylinder；The undercut groove only opened on side, this side is to described first folding Wrinkle seat portion, and be suitable to comprise one end of described sheath.

10., for clamp for disk brake, described disk brake includes being contained in described disc type Piston in the cylinder of the caliper body of brake, can be pressed on described brake rim, Described piston has what the cylinder surfaces with the described caliper body accommodating described piston coordinated Outer surface of piston, described outer surface has table in predetermined piston diameter, and described cylinder Mask has predetermined cylinder bore, and wherein, described piston includes piston only and is pressed on institute Stating the head on liner, described clamp include:

Sheath shell, is arranged on the head of described piston, and described sheath shell has housing Wall portion, region be directly facing the first opening of described cylinder and region be directly facing described brake rim The second opening,

Sheath, has multiple wrinkle, and the plurality of wrinkle are formed by each several part of described sheath, The plurality of wrinkle are folded such that its surface region be directly facing each other, and allow described sheath Extend during the cylinder of described caliper body moves out at described piston,

It is characterized in that,

This sheath shell accommodates the plurality of wrinkle of described sheath completely, thus avoids in institute The housing of the plurality of wrinkle it is provided in stating caliper body

Described sheath includes: the first shackle, and the external diameter along described sheath is arranged, axially Side projects upwards and is adapted to secure to caliper body, and described first shackle includes being arranged in described Becket bracing means in first shackle, it is described that described becket bracing means is immersed in composition In the material of the first shackle.

11. clamp for disk brake according to claim 10, wherein, described clamp bag Include:

Flexible shroud, for protecting the piston-cylinder unit of disk brake, described flexibility is protected Set can be arranged in collapsed state and in extended configuration, this sheath includes:

Sheath body, described sheath body extends radially to external diameter from internal diameter, and limits axially Radial direction that direction is orthogonal with described axial direction and circumferential direction；Described sheath Body includes:

Described first shackle；

Second shackle, the internal diameter along described sheath is arranged, on described axial direction Highlight and be adapted to secure to described piston；

Jacket portions, extends from described internal diameter；

Multiple wrinkle, separate with described second shackle, and by by described sheath originally The wrinkle that each several part of body limits are formed, and the plurality of wrinkle are folded such that its surface Region be directly facing each other, and allow described sheath at described piston from described caliper body Cylinder move out during extend；The plurality of wrinkle are all arranged in from institute State in the described jacket portions that internal diameter extends；

Described body includes the connection band that described first shackle is connected to the plurality of wrinkle, Described connection band prolongs described in the radial direction by the shape of disc in the way of substantially planar Stretch；

Wherein,

The plurality of wrinkle are at described the first predetermined extension extending wrinkle in the radial direction Or radial extension；

Described connection band connects, described extension in the radial direction, the second predetermined extension carried Or radial extension；

And wherein, described the second predetermined extension is equal to or more than described predetermined first Extension；

And/or wherein,

Described flexible shroud includes,

The plurality of wrinkle extend the 3rd predetermined extension of wrinkle on described axial direction Or axially-extending portion；

Described first shackle extends predetermined the 4th of the first shackle on described axial direction and prolongs Extending portion or axially-extending portion；

And wherein, described the 4th predetermined extension is more than or equal to the described predetermined 3rd Extension.

12. according to the clamp for disk brake described in claim 10 or 11, wherein, described Clamp include:

Caliper body, limits cylinder, so that the piston being intended to act on brake rim slides,

According to any one of claim 1 to 6 for protecting piston-cylinder unit Flexible shroud；

According to the piston according to any one of claim 7 to 9.

13. clamp for disk brake according to claim 10, wherein, limit described gas The described caliper body of cylinder includes the First portion accommodating described first shackle.

14. clamp for disk brake according to claim 10, wherein, protecting of packing up In the state of set, the band that connects of described sheath is contained in the described clamp of the described cylinder of restriction originally In the toroidal shell of body, substantially perpendicularly extend with the axis with described piston, described One shackle is contained in the First portion of described cylinder, and the remainder of described sheath holds It is contained in the sheath shell of described piston.