CN1058775C - Drum brake actuator - Google Patents
Drum brake actuator Download PDFInfo
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- CN1058775C CN1058775C CN92112497A CN92112497A CN1058775C CN 1058775 C CN1058775 C CN 1058775C CN 92112497 A CN92112497 A CN 92112497A CN 92112497 A CN92112497 A CN 92112497A CN 1058775 C CN1058775 C CN 1058775C
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Abstract
The present invention relates to an execution mechanism of a drum type brake, which has a structure for controlling the brake in a servo braking mode or a parking braking mode. The execution mechanism comprises a piston/cylinder assembly and a control rod installed in a rotary mode, wherein the piston/cylinder assembly is positioned between supporting feet on the corresponding end parts for placing of a braking shoe, and the two corresponding end parts for placing are separated so as to apply braking in the servo braking mode; in the parking braking mode, when rotated, the control rod and one of the feet of the braking take joint action to push the piston/cylinder assembly to be against the other feet. Thus, the piston/cylinder assembly is used as one part of the control rod in the parking braking mode so as to make the braking shoe unfold and apply the braking.
Description
The present invention relates to a kind of actuator that is used for the drum brake brake shoe.The present invention will to have neck serve as with reference to specifically describing from the drum brake of structure with a kind of.This drum brake has a rounded substantially single shoe plate.Yet, should be appreciated that the present invention also can be used for having the drum brake of different shoe plate structures.
Be used for the process of the break of motor vehicle or similar device in manufacturing, should make the component of brake assembly the least possible, can have many advantages for this reason, comprise the possibility that reduces assembly failure, shorten the assembling required time of break.Assembly cost is correspondingly descended.The hydraulic brake of aforementioned type is equipped with a piston/cylinder assembly usually at least, and this assembly has two pistons that move in the opposite direction in described cylinder, and these two pistons are arranged to contact with the opposed end of brake shoe assembly.This set need carry out independent sealing to each of two pistons, have further increased the required number of components and parts of whole assembly for this reason.The assembly of the single piston that the past continues to use always can not make the people satisfied fully, because the piston/cylinder assembly need slide with respect to the backboard that brake assembly is housed.And the surface of contact of described slip becomes the main root that goes wrong owing to producing corrosion and clamping stagnation.
Not only have servo brake but also have in the drum brake assembly of parking braking actuator, operated by rotary motion one parking braking bar, it is independent of hydraulic servo brake systematically by mechanical handling.There are many problems in the existing layout of this type break.A kind of layout wherein, the parking braking bar passes the break backboard along a plane that is roughly parallel to the rotation axis of brake drum, so that handle from the outside of brake assembly.Therefore this arrangement is referred to as the sliding operating handle, and its shortcoming is that described operating handle must pass backboard, must seal or add shroud respectively on it passes the position of backboard, enters brake assembly to prevent dust.This measure that adds the shroud sealing has increased the number of parts of brake assembly.Be called in the layout of vertical pull-type operating handle at another kind, the parking braking bar is handled in a relative brake drum rotation axis is horizontal plane substantially, the shortcoming of this layout is, described parking and braking mechanism on brake shoe point of action and the point of action of servo brake be separated, thereby increased the number of spare parts of parking and braking mechanism.In addition, the separation setting of this point of action is unpractical for single shoe plate break that the brake shoe of some structure particularly has a guide groove that the brake shoe body is separated.
U. S. Patent discloses a kind of drum brake assembly No. 2666504, and it comprises a pair of brake shoe, and they are pivotably connected in a pair of relative end, and relative end is acted at another by a piston-jar assembly.This drum brake also comprises a brake parking lever that acts between piston-cylinder assembly and brake shoe.The expansion of brake shoe is that the mechanism by the hydraulic pressure of piston-cylinder assembly or the brake parking lever by drag-line realizes that above-mentioned two kinds of effects are separate.This drum brake assembly has adopted sliding interface especially between each movable members, this can cause serious frictional loss, surface abrasion and mechanical efficiency low, and the input and output load of drum brake assembly all transmits by the piston-cylinder assembly, and this makes this assembly be subjected to great load effect.
In addition, should have exactly a requirement of current brake assembly and can regulate automatically so that compensate the mechanism of liner wearing and tearing in use.Another requirement is that this automatic controlling mechanism can be worked when servo brake is enabled, and irrelevant with whether enabling of parking braking.This mechanism also should relatively simply reach safety.
The actuator that the purpose of this invention is to provide a kind of improved drum brake, it has better simply structural type and utilizes less component.Another object of the present invention is, in an optimum structure form, provides a kind of mechanism, and it can use with a monolithic brake shoe, and can overcome or reduce at least the part of above-mentioned shortcoming.Another purpose of the present invention is in an optimum structure, to provide a kind of like this mechanism with single piston hydraulic pressure actuating device.A further object of the present invention is, in an optimum structure, provides a mechanism with simple and effective automatic control tegulatingdevice.
According to an aspect of the present invention, provide the actuator of a drum brake at this, it comprises-the piston/cylinder assembly that this assembly has constituted the part of main brake actuator; One constitutes an auxiliary braking actuator part and links to each other with described assembly and around the executive component of pivotal line rotation, described pivotal line is with respect to the longitudinal axis horizontal expansion of described assembly; Reaction device has constituted the part of described executive component, and with described pivotal line spaced along this axis; Described assembly and executive component acting in conjunction and become a composite structure, it is between two of a brake shoe relative and alternate legs, so that described reaction device and a described leg acting in conjunction, and described assembly and another described leg acting in conjunction; At this, described composite structure is steerable so that increase the spacing between described leg, and when described executive component along a certain direction when described pivotal line moves, brake shoe is radially opened; And described assembly can be independent of described composite structure ground and handles, and describedly radially opens thereby produce.
According to a further aspect in the invention, provide the actuator of a drum brake at this, it comprises that one constitutes the piston/cylinder assembly of a main brake actuator part; One constitutes an auxiliary braking actuator part and links to each other with described assembly and around the executive component of pivotal line rotation, described pivotal line is with respect to the longitudinal axis horizontal expansion of described assembly; Constitute the reaction device of a described executive component part, it and described pivotal line are spaced along this axis; Described assembly and executive component acting in conjunction constitute a composite structure, it is between two of a brake shoe relative and alternate legs, so that the acting in conjunction of one of described assembly and described leg and can with another acting in conjunction of described leg, described reaction device and another above-mentioned leg acting in conjunction; At this, described main brake actuator is steerable, thereby makes described assembly and above-mentioned two leg actings in conjunction and extend vertically, so that increase the spacing between described leg thus, and brake shoe is radially opened and meshes with brake drum; Described auxiliary braking actuator is steerable, thereby described executive component can be moved along a certain direction around described pivotal line, thus described reaction device is pushed against a described leg place, and described assembly is pushed against described another leg place, described spacing is increased with this.
In aforementioned, touch upon with the coefficient problem of leg, should be understood that the non-direct coefficient situation that also includes with leg, promptly can finish by intermediate member with the acting in conjunction of leg.
In a best mode of the present invention, the piston/cylinder assembly is hydraulic operated and constitutes the part of servo brake actuator.For this reason, the piston/cylinder assembly to brake shoe open with the influence of shrinking may be to a great extent with irrelevant by the similar influence that pivoting action produced of the executive component of described auxiliary actuator.That is to say the respective leg acting in conjunction that the opposed end of described piston/cylinder assembly may be handled with servo brake, and the leg acting in conjunction that unique end of described assembly may be handled with parking braking.On the other hand, above the main actuating mechanism of being touched upon be generally the actuator of servo brake, and auxiliary actuator is the actuator of parking braking.
The executive component of described auxiliary actuator is preferably an operating handle, and it can move in roughly with respect to the horizontal plane of the rotation axis of corresponding brake drum one.Above-mentioned reaction device is positioned at an end of described bar, and a wire rope or other force transfering device can link to each other with the relative the other end of described bar.Setting and piston/cylinder assembly is pivotally connected between described two end part, and this connection can be the layout of balance pivot formula.
Embodiments of the invention will give detailed description in reference to the description of the drawings book paragraph following.Yet these accompanying drawings have only schematically shown the mode that may implement of the present invention, therefore not should with shown in the concrete structure and the setting type of each feature be interpreted as limitation of the invention.
In the accompanying drawing:
Fig. 1 for will be according to an embodiment of the invention actuator install to the local end sectional view of this assembly on the brake assembly;
Fig. 2 is the top view of brake assembly shown in Figure 1, shows the sectional drawing of piston/cylinder assembly for ease of instruction card;
Fig. 3 be among Fig. 1 along the sectional view of III-III line, omitted the part parts for ease of description;
Fig. 4 and Fig. 3 are similar, and the section that it has represented the cylinder body of piston/cylinder assembly has wherein omitted some parts for ease of explanation:
Fig. 5 be among Fig. 1 along the sectional view of V-V line:
Fig. 6,7 and 8 schematic diagrams according to actuator of the present invention working method.
In the layout shown in Fig. 1, the actuator 1 of drum brake is installed on the backboard 2 that is fixed on the Motor Vehicle (not shown), and fixes with respect to described rotatable brake drum.Brake shoe 3 is preferably roughly rounded as shown in the figure, and is installed on the backboard 2 with radially opposed position.Brake shoe body 4 has the relative and alternate end that separates 5 and 6, and actuator 1 is set between these two end part, and these two end part are separated, thereby the friction material 7 on brake shoe body 4 radially-outer surfaces is contacted with corresponding internal surface on the brake drum.Hoof end 5 and 6 can suitable arbitrarily mode remain against on the backboard 2, as the biasing spring 8 of effect between the piston/cylinder assembly 9 of backboard 2 and floating support.Brake shoe 3 can link to each other with a stand bar seat 10 of bearing braking torque with actuator 1 a radially opposed side, and this side can keep it to lean against on the backboard 2 as spring clip 11 in any suitable manner.
Actuator 1 comprises: piston/cylinder assembly 9, this assembly 9 is provided with in the mode that its longitudinal axis extends between the end 5 and 6 of brake shoe 3.Described mechanism 1 preferably has an automatic control regulator, and this regulator can comprise a screw rod 12, and screw rod 12 contacts with the leg 13 that constitutes at the end of brake shoe end 6.Screw rod 12 is arranged at an end place of piston/cylinder assembly 9, and links to each other with the cylinder body 14 of assembly 9 as description hereinafter.In the shown arrangement, make another respective end and leg 15 acting in conjunction indirectly of assembly 9, this leg 15 is positioned at hoof end 5 places.This indirect acting in conjunction is to be undertaken by the extension 16 of hoof end 5.
When described break was handled with the pattern of servo brake, compression fluid was forced into cylinder body 14, thereby the piston 17 that makes assembly 9 16 moves towards the extension; Should mobile piston rod 18 be pressed against on the extension 16, and force the end 5 and 6 of brake shoe 3 to be separated thus.Show this separation to Fig. 7 principle, compare with Fig. 6, this separation increases the spacing between hoof end 5 and 6.Piston rod 18 and adjusting screw rod 12 each have a notch, and extension 16 and leg 13 are set respectively in the notch.Assembly 9 with under the backboard 2 contacted situations is not being supported by hoof end 5 and 6 thus.
Actuator comprises the executive component of an auxiliary actuator 1, shown in arrangement in be an operating handle 19, this bar 19 can be independent of piston/cylinder assembly 9 ground and carry out work.This bar 19 is preferably handled by mechanical linkage of band drag-line 20, so that still can handle break when assembly 9 or corresponding hydraulic system break down.Shown in the arrangement, an end 21 of operating handle 19 is arranged in the groove 22 that forms on the extension 16 of brake shoe heel, and its corresponding the other end 23 has a hook 24, drag-line 20 is on it, so that handle described bar 19.Described rod end 21 constitutes reaction device, leg 15 actings in conjunction of this device and described hoof.
Operating handle 19 links to each other with a certain position of assembly 9 between the end 21 and 23 of described bar rotationally.Shown in the arrangement, this parts that are connected to a kind of balance pivot Connecting format.Preferably as shown in Figure 2, operating handle 19 is installed between the two spaced arms 25 of member 26, member 26 be connected on the cylinder body 14 or with its formation one integral body.The part of groove 27 (Fig. 2) receiving member 26 that the edge of operating handle 19 constitutes, matching with the fulcrum edge 28 (Fig. 2) of member 26 in the bottom of this groove 27, thereby forms turnable the connection.Obviously, operating handle 19 and member 26 will keep suitable relation by above-mentioned structure.In addition, the operating handle 19 of this layout can rotate around a pivotal line with respect to member 26, and this axis is horizontal with respect to the longitudinal axis of assembly 9, and is roughly parallel to the rotation axis of corresponding brake drum.
When break was worked with the parking braking pattern, as Fig. 8 schematically represented, operating handle 19 rotated with respect to member 26.Consequently, reaction device 21 presses against on the leg 15, and assembly 9 moves in opposite direction and presses against on the leg 13.This rightabout moving produced by the reaction that acts on fulcrum edge 28 places.Thereby operating handle 19 combines with assembly 9 and constituted composite structure, and the break applied force is reacted on the two end part 5 and 6 of brake shoe.Particularly, operating handle 19 directly acts on end 5, and by assembly 9 indirectly-actings in the other end 6.
Operating handle end or reaction device 21 can be remained in the groove 22 by any suitable mode, for example, are obtained or are born by the protrusion 29 (Fig. 2) from the part excision of a side horizontal expansion of described bar 19.And being moved further of bar 19 can be prevented just as " key " by the localization part of groove 22 median claws 30.
As shown in the figure, operating handle 19 is preferably in the open plane of brake shoe, promptly works in the plane with respect to the spin axis extending transversely of brake drum.This arrangement has many advantages, and at first operating handle 19 does not need to pass backboard 2 as sliding parking braking bar, thereby also need not to add the enclosure individually as described sliding bar is desired; Secondly can adopt and operate better simply automatic control tegulatingdevice comparatively speaking.
Utilize cylinder body 14 to have many advantages as a series of one of the parts that break works that make when the parking braking, its more important advantage is that brake shoe leg used in the servo brake pattern also can be used for the parking braking pattern.Therefore, only need a single leg at an end place of brake shoe, and a single leg with extension is set at the other end place.Thereby for the actuator of break provides a better simply relatively leg arrangement.
As previously mentioned, the present invention is specially adapted to use with rounded substantially monolithic brake shoe.Such brake shoe has the many advantages that comprise less component number, and it also has is convenient to apply that the position returns to brake releasing position and the intrinsic resilience that need not independent return spring from braking.In an optimum scheme.Brake shoe body 4 is that the metallic material of guide groove shape or U-shaped is made by the cross section.It is not too easily that leg (block) is set on the metal section of channel section, generally need extra welding or machining, shown in optimal placement in, thereby the problems referred to above are avoided by the scheme that constitutes leg that the guide groove former at end 5 and 6 places or base plate are bent inwards.
Mechanism 1 preferably has an automatic control regulator, and can have any suitable form.A kind of gratifying regulator has been shown in the accompanying drawing.This regulator have be positioned at cylinder body 14 sleeve 31 (Fig. 2) so that can be around the rotational of described cylinder body, sleeve 31 has a tapped hole that matches with the threaded body part 32 of screw rod 12.One ratchet or gear 33 are fixed on the sleeve 31 and can rotate together.This regulator also comprises ratchet 30, and it links to each other with the upper end of operating handle 19 rotationally, also links to each other with cylinder body 14 simultaneously.Ratchet 30 forces it to lean against on the ratchet 33 by a stretched spring 34 (Fig. 1).
When actuator 1 works with the servo brake pattern with the parking braking pattern, and the two end part 5 of brake shoe are when 6 separate excessively, and ratchet 30 will rotate with respect to ratchet 33, therefore can not take place with ratchet 33 peripheries on tooth situation about being separated.When braking was removed, ratchet 30 was swung backward and is got back to its home position, and ratchet 33 is rotated.And sleeve 31 is rotated relative to screw rod 12, because screw rod 12 and 31 in sleeve are screw-thread fit, so make screw rod 12 vertically towards the outer side shifting of jacket casing 31.The result increases the effective length of assembly 19, thereby when liner 7 wearing and tearing, brake shoe 3 is remained unchanged to the stroke that applies braking substantially by brake off.
Corresponding with above-mentioned situation, spring 34 acts between ratchet 30 and cylinder body 14 by this way, promptly forces ratchet 30 to rotate along a suitable direction.In this respect, ratchet 30 can be formed in around one and handle rod end 21 places or near the axle this end swings to a limit position.As previously mentioned, ratchet 30 parts are arranged in the groove 22.
The upper end portion of brake shoe 3 is installed on the backboard 2 by means of the stretched spring 8 that cylinder body 14 is connected on the backboard 2.Shown in the arrangement, stretched spring 8 is connected on the lug 35, this lug 35 is laterally projecting near the brake drum rotation axiss from cylinder body 14.Described connection makes cylinder body 14 have the trend of rotating along the direction of stretched spring 8 applied forces.Operating handle 19 rests on one on the raised platform 36 (Fig. 1) that forms on the backboard 2, limits the rotatable scope of cylinder body 14 thus.Thereby spring 8 plays upper end portion with brake shoe 3 and remains against effect on the backboard 2, also operating handle 19 remained against on the position of backboard 2 simultaneously.Above-mentioned arrangement guarantees that operating handle 19 can not produce undesirable vibration or mobile in vehicle operating.
Above-mentioned spring 8 is an example only, and being installed in other positions, to finish the other forms of biasing spring of similar functions also be feasible.
As Fig. 4 institute clearly expression like that, cylinder body 14 has one to enter the mouth 37, by this mouth under pressure fluid be transported within the described cylinder.Cylinder body 14 also has one with the outlet 38 of fluid from described cylinder body discharge, and described entrance and exit all is arranged on the protuberance 39 of cylinder body 14, and this protuberance 39 passes the hole 40 on the backboard 2.One rubber sleeve 41 (Fig. 3) is installed in the groove 42 (Fig. 2) that forms on the cylinder body 14 around cylinder body 14.Cover 41 links to each other with backboard 2 around hole 40 formed grooves through a series of, and overlaps 41 and can prevent basically that at least dust from entering in the brake assembly from this.The high-pressure liquid that enters described cylinder is preferably supplied with by a flexible hose or metal tube 43 (Fig. 3), and described pipe 43 is linked to each other with inlet by standard nut 44.Under a kind of situation in back, pipe 43 (metals) preferably are installed between a pair of finger-like locating piece 45 (Fig. 3) that is positioned on the cylinder body 14, so that supporting supplying pipe 43, and prevent that it from rotating when fastening nut 44.
When need with brake drum when car removes, at first possibly by inwardly screwing screw rod 12 to reduce the effective length of piston/cylinder assembly 9.For this reason, need to pull down cover 41, thereby just may make ratchet 30 and ratchet 33 break away from engagement and ratchet 33 is rotated in opposite direction, so that reduce the effective length of assembly 9 from backboard 2.
Because hydraulic system only utilized a single piston, thus cylinder body 14 in the working procedure of break and the whole length of life of liner 7 must be able to move with respect to backboard 2, must be enough greatly so run through the hole 40 of backboard 2 so that allow above-mentioned mobile.Yet in fact described cylinder body 14 does not preferably directly contact backboard 2.Shown in layout in, the realization of above-mentioned purpose is to finish by brake shoe 3 go up to be slided at platform 46 (Fig. 5), platform 46 is outwards extruded by backboard 2 and the projection that produces constitutes, and the degree of each projection is along the radial direction unanimity.When brake shoe 3 was made by the profile material of channel section, two side plates 47 (Fig. 5) preferably were inclined to splayed shape a little, so that be radially inside from the outer edge of backboard 2 with the surface of contact of brake shoe 3 on the backboard platform 46.
Because cylinder body 14 does not contact with backboard 2, exist cylinder body 14 to block the possibility that leans against on the backboard 2 hardly.Before this, this card is a big shortcoming that has the break existence of sliding contact between this cylinder body and backboard by showing.For the upside of avoiding above-mentioned brake assembly is broken away from backboard 2 by pull-up by accident, cylinder body 14 preferably has a lip 48 (Fig. 4), and this lip 48 is positioned at after the hole 40 of passing backboard 2.When brake assembly from backboard 2 rising time-outs, this lip 48 contacts with the back side of backboard 2, otherwise will not have contact between them.
The present invention is except that the preceding advantage of having addressed, also have other various advantages, particularly, because the simplification that leg is provided with, no longer need special operating handle or additional stand bar seat, the inside radial space of brake shoe 3 is well-to-do for the component of break, and the exceptional space in the brake assembly that is produced can be used for being provided with antilock braking system (ABS) or similarly device as required thus.The component number purpose reduces the overall cost that also will make break and reduces, and simplifies assembling and shorten installation time.
At this, the layout of described component and structure can have various remodeling, augment or conversion under the situation of the spirit or scope that do not break away from claims of the present invention and limited.In addition, corresponding term " left hand " and " right hand " used in the specification are not to be that these terms only are used for simple description of the present invention on the arrangement shown in desire is limited to the present invention specifically, and other structure also is fully feasible.
Claims (11)
1. the drum brake assembly has
One backboard (2);
One brake shoe (3) that links to each other with backboard (2), two relative isolated ends (5 are arranged, 6), one first leg (15) and second leg (13) at brake shoe (3) the other end (6) at brake shoe (3) one ends (5), this brake shoe (3) comprise body (4) and the lining friction material (7) attached to it that a single-piece constitutes;
There is a piston-cylinder assembly (9) in one main brake actuator, it has first and second ends, described first end is supported on first end (6) of brake shoe (3) movably through being rotationally connected, second end of described piston-cylinder assembly is supported on second end (5) of brake shoe (3) movably through being rotationally connected by an auxiliary braking actuator, piston-cylinder assembly (9) can move relative to above-mentioned backboard (2) like this, at least can radially move with respect to the rotational axis of brake drum, above-mentioned piston-cylinder assembly (9) has a piston element (18) and cylinder parts (14), they can handle separately with above-mentioned one each above-mentioned leg (13,15) acting in conjunction;
There is an executive component (19) that is included in the brake component assembly in described auxiliary braking actuator, and above-mentioned executive component (19) has a reaction device (21), through rotating second end (5) of described executive component (19) being linked brake shoe (3);
Above-mentioned executive component (19) is linked wherein above-mentioned piston-cylinder assembly parts (14 rotationally, 18) one of device, be used for doing relative movement around the pivotal axis that parallel brake drum rotational axis extends, above-mentioned pivotal axis and above-mentioned reaction device (21) are spaced apart at the horizontal direction of above-mentioned pivotal axis;
Wherein, in first operating pattern of above-mentioned brake assembly, above-mentioned piston-cylinder assembly parts (14,18) one of coordinate and form a composite structure with above-mentioned executive component (19), above-mentioned reaction device (21) and (6) acting in conjunction of brake shoe second end and above-mentioned piston-cylinder assembly parts (14,18) one of with the leg acting in conjunction of brake shoe first end (5), like this when above-mentioned executive component (19) when above-mentioned pivotal axis moves with first direction, above-mentioned composite structure can be handled with the interval that increases above-mentioned brake shoe (3) two ends (5,6) and make the brake shoe radial expansion;
Wherein in above-mentioned second operating pattern, above-mentioned piston-cylinder assembly (9) can be independent of above-mentioned executive component (19) and handle, and increase interval between the brake shoe two ends (5,6) so that brake shoe (3) radial dilatation with above-mentioned brake shoe two ends (5,6) acting in conjunction.
2. drum brake assembly according to claim 1 is characterized in that, above-mentioned cylinder parts (14) constitute parts of above-mentioned piston-cylinder assembly (9).
3. drum brake assembly according to claim 1 is characterized in that, also comprises the extension (16) that also has above-mentioned first leg;
Wherein, above-mentioned piston-cylinder assembly and above-mentioned second leg (13) and above-mentioned extension (16) acting in conjunction when above-mentioned piston-cylinder assembly (9) is independent of the operation of above-mentioned composite structure, thus make brake shoe (3) radial dilatation.
4. drum brake assembly according to claim 1, it is characterized in that, be used for moving the operation equipment (20) of above-mentioned executive component (19) in addition, above-mentioned executive component (19) is the form with bar, above-mentioned reaction device (21) is positioned at the first end of executive component (19), aforesaid operations device (20) and above-mentioned executive component (19) are located to link to each other in the face of the second end (24) of first end and above-mentioned piston-cylinder assembly parts (14,18) link to each other with above-mentioned executive component (19) between above-mentioned first and second ends at executive component (19).
5. drum brake assembly according to claim 1 is characterized in that, above-mentioned piston-cylinder assembly (9) passes perforate (40) on the backboard (2) and do not contact with backboard (2) and extend.
6. drum brake assembly according to claim 1, it is characterized in that, above-mentioned reaction device (21) on above-mentioned executive component (19) and above-mentioned first leg (15) are by the first trochoid joint acting in conjunction and above-mentioned piston-cylinder assembly parts (14,18) extend in the direction that is being parallel to the brake drum rotational axis with the pivot of above-mentioned second leg (13) by the second trochoid joint acting in conjunction and the above-mentioned first and second trochoid joints.
7. drum brake assembly according to claim 1 is characterized in that, a spring part (8) is linked above-mentioned backboard (2) and above-mentioned piston-cylinder assembly (9), and above-mentioned spring part (8) is pressed to above-mentioned backboard (2) to above-mentioned brake shoe end (5,6).
8. drum brake assembly according to claim 1 is characterized in that, above-mentioned pivotal axis is extended along the direction that the longitudinal axis of above-mentioned piston-cylinder assembly (9) moves at above-mentioned executive component.
9. drum brake assembly according to claim 1 is characterized in that, above-mentioned piston-cylinder assembly (9) includes the device of adjusting its effective length automatically and weares and teares to compensate a relevant brake shoe.
10. drum brake assembly according to claim 9, it is characterized in that, above-mentioned regulating device comprises that one has the adjusting screw rod (12) of screw thread, this adjusting screw rod has a gear (33) and acting in conjunction in the spring bias voltage pawl (30) of this gear (33), above-mentioned adjusting screw rod (12) is positioned at the termination of above-mentioned piston-cylinder assembly, contiguous above-mentioned second leg (13).
11. drum brake assembly according to claim 1 is characterized in that, above-mentioned brake shoe body (4) has channel shape cross-section, and each of above-mentioned leg (13,15) is to form by the end at the bottom of this flute profile is radially curved inwardly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92112497A CN1058775C (en) | 1992-09-30 | 1992-09-30 | Drum brake actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92112497A CN1058775C (en) | 1992-09-30 | 1992-09-30 | Drum brake actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085170A CN1085170A (en) | 1994-04-13 |
| CN1058775C true CN1058775C (en) | 2000-11-22 |
Family
ID=4945967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92112497A Expired - Fee Related CN1058775C (en) | 1992-09-30 | 1992-09-30 | Drum brake actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058775C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101271508B1 (en) * | 2011-09-16 | 2013-06-05 | 주식회사 만도 | Wheel cylinder and drum brake with the same |
| CN103991438B (en) * | 2014-05-23 | 2016-08-24 | 宁波如意股份有限公司 | The arrestment mechanism of hoolivan |
| DE102014212897B4 (en) * | 2014-07-03 | 2016-02-04 | Saf-Holland Gmbh | braking system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2281150A (en) * | 1939-08-17 | 1942-04-28 | Bendix Aviat Corp | Brake |
| US2316450A (en) * | 1940-10-28 | 1943-04-13 | Automotive Prod Co Ltd | Brake for vehicles |
| US2666504A (en) * | 1949-10-07 | 1954-01-19 | Edward H Berno | Brake |
| US3199639A (en) * | 1962-03-16 | 1965-08-10 | Girling Ltd | Shoe drum brakes |
| US3316450A (en) * | 1963-08-26 | 1967-04-25 | Troubetzkoi Michel | Adjustable flash for photography |
| US3722635A (en) * | 1970-02-02 | 1973-03-27 | Aisin Seiki | Automotive wheel brake mechanism fitted with automatic brake gap adjuster |
| US4148379A (en) * | 1977-02-28 | 1979-04-10 | Tokico Ltd. | Brake shoe clearance adjusting device |
| US4588052A (en) * | 1981-07-10 | 1986-05-13 | Societe Anonyme D.B.A. | Drum brake |
-
1992
- 1992-09-30 CN CN92112497A patent/CN1058775C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2281150A (en) * | 1939-08-17 | 1942-04-28 | Bendix Aviat Corp | Brake |
| US2316450A (en) * | 1940-10-28 | 1943-04-13 | Automotive Prod Co Ltd | Brake for vehicles |
| US2666504A (en) * | 1949-10-07 | 1954-01-19 | Edward H Berno | Brake |
| US3199639A (en) * | 1962-03-16 | 1965-08-10 | Girling Ltd | Shoe drum brakes |
| US3316450A (en) * | 1963-08-26 | 1967-04-25 | Troubetzkoi Michel | Adjustable flash for photography |
| US3722635A (en) * | 1970-02-02 | 1973-03-27 | Aisin Seiki | Automotive wheel brake mechanism fitted with automatic brake gap adjuster |
| US4148379A (en) * | 1977-02-28 | 1979-04-10 | Tokico Ltd. | Brake shoe clearance adjusting device |
| US4588052A (en) * | 1981-07-10 | 1986-05-13 | Societe Anonyme D.B.A. | Drum brake |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085170A (en) | 1994-04-13 |
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Granted publication date: 20001122 Termination date: 20091030 |