CN2249204Y

CN2249204Y - Drum-type braking device

Info

Publication number: CN2249204Y
Application number: CN96201558U
Authority: CN
Inventors: 赖益泰
Original assignee: WENZAO INDUSTRIAL Co Ltd
Current assignee: WENZAO INDUSTRIAL Co Ltd
Priority date: 1996-01-22
Filing date: 1996-01-22
Publication date: 1997-03-12
Anticipated expiration: 2006-01-22
Also published as: NL1004913C2; FR2743773B3; ITTO960266U1; CA2192873A1; KR970049458U; IT239881Y1; FR2743773A3; NL1004913A1

Abstract

The utility model relates to a drum type brake device. A hollow circular body which is composed of three brake blocks is arranged on a shaft lever in a central hub head of a wheel, and a triangular lug is embedded in the hollow circular body. The triangular lug can be rotated due to the transmission of external force at the time of brake, so that the three-section brake blocks are braced to open and expand; the brake blocks can be uniformly butted and pressed on the inner ring surface of the hub head, so that the friction area for braking is increased. The braking sensitivity is enhanced, and accordingly, the optimal braking effect is obtained.

Description

Drum-type brake

The utility model relates to a kind of drum-type brake.

See also Fig. 1, conventional confguration site plan shown in Figure 2, the general brake of motorcycle on the market has multiple form, and wherein a kind of is the two sectional type brake structure 30 that is installed in the interior ring 211 of motorcycle flower hub head 20; Its main operating principle is in the ring 211 in colored hub head 20 1 sides of a two sectional type brake structure 30 being inserted in motorcycle, wherein spending hub head 20 is just like the wheel shaft that is installed in the motorcycle wheel center among Fig. 1 and is articulated with the forward and backward fork of motorcycle, it is for respectively being provided with the annulus disk body of an outer shroud 21 with pipe bearing two ends, wherein two outer shrouds, 21 anchor ring centers are provided with the circular groove of ring 211 in; And two sectional type drum brakes structure 30 is encircled in 211 in mainly being inserted in two brake facings 31, two brake facings 31 respectively are half circular lamellar body, and closing becomes slightly little than interior ring 211 a diameters oval hollow circle, the end that joins of two brake facings 31 articulates with a pivot 32, the other end then each closing is cut on two axial sections up and down of axle 34 at a circle, circle is cut axle 34 socket one plate 35 outside lamellar body, plate 35 connects a brake cable (figure do not show) again, again with two brake facings, 31 involutory back snapping two springs 33 at hollow inner edge two ends.

Tradition two sectional type brake structure 30 is to utilize brake cable to drive plate 35 from tension back, a car body place when brake, plate 35 is just taken advantage of a situation to drive with its lamellar body bonded assembly circle and is cut axle 34 rotations, when circle is cut axle 34 and is rotated just the pivot joint by pivot 32 form a rotating fulcrum and strut the position in axial section two brakes 31 expansion outward up and down, interior ring 211 anchor rings of the colored hub head 20 during the 31 expansion back contacts of two brake facings are rotated, behind urgent roof pressure, produce friction force and make colored hub head 20 be obstructed and stop operating, just form the brake of two sectional type brake structure 30, to brake when finishing, again the mat brake cable from the outside loosen and 33 tensions of two springs after the elastic force that produces make two brake facings 31 be returned to the initial position; But there is following shortcoming in this structure:

Two brake facings 31 are a half-elliptic circle, rotate one end location during expansion, the other end is expanded outward and interior ring 211 anchor rings of roof pressure flower hub head 20 reach brake, therefore brake facing 31 launch and with flower hub head 20 in ring 211 anchor ring contact surface positions (shown in solid line position among Fig. 2), only the local area with slightly little than ring in the flower hub head 20 211 an internal diameter semicircle contacts, and rubbing angle is an oblique angle, so, just in the time of can producing brake facing 31 brakes, 31 energy area of contact of brake facing are too small, the brake lining contact is inhomogeneous, and it is not good to be directed at braking effect, brake overlong time etc. has a strong impact on the shortcoming of brake safety.

Shortcoming at above-mentioned conventional confguration generation, the utility model is improved, the purpose of this utility model, provide a kind of drum-type brake, spend hub head inner ring surface to reach the effect of brake by the syllogic brake shoes by the expansion uniformly of rotation do and the roof pressure of triangle convex, thereby the frictional area in the time of can increasing brake improves sensitivity and braking effect, reduces because of the not enough contingent accident of brake sensitivity.

The technical solution of the utility model is: a kind of drum-type brake, and it is to embed a syllogic brake structure on the screw axostylus axostyle in the ring in the first side of wheel center flower hub of bicycle, it is characterized in that:

It includes three brake shoes, a triangle convex, a lamellar body, a spanner, a cover plate, wherein:

This triangle convex is a convex body, and an end is extended with a couple axle and pullover, and a perforation is offered at the center, and wherein the triangle convex profile is that the hollow profile of the circle formed with brake shoes is identical;

These three brake shoes are formed the circular arc block of a hollow circle, all be provided with a conduit of offering along cambered surface on its cambered surface, the hollow part embeds this triangle convex, outside conduit then is inserted in a clasp, then be provided with the guide hole that runs through on the side, the perforation at this triangle convex center embeds in the flower hub head and locatees in the screw axis hole in the ring, between two structures and penetrated a pad;

This lamellar body is a fixed plate, this has a baffle ring, a trepanning and several trepanning, locking holes and three position guiding rods on the lamellar body, this lamellar body covers the opposite side of colored hub head, the trepanning of its median plate body passes for the trace of triangle convex, pullover and screw axostylus axostyle, and three position guiding rods then are inserted in the guide hole of brake shoes;

This spanner is a crooked plate body, and an end is provided with the pullover socket of a grooving and triangle convex, and an end then connects exterior brake cable;

This cover plate is that a tool protrudes the plate in space and offers an opening at the protrusion place, the cover plate outside is provided with several locking holes, the center is provided with a perforation and passes for the screw guide rod, integral cap is combined in a side of spanner, spanner is passed on the opening that protrudes the space, and fasten a torque spring on spanner and aperture position;

Be locked together in hold-doun nut and Locking screw on the locking holes of screw axostylus axostyle, each element and locate.

The wherein expansion of brake facing and triangle convex body design, can cooperate required condition make with four or more the required angle of brake shoes fit brake facing number projection and carry out the brake structure that the central term companding is opened with above-mentioned structural group dress, acting characteristic.

The utility model has the advantages that:

One, brake of the present utility model is pushed brake shoes 11 for utilizing triangle convex 112 with circumferencial direction, it reaches brake with 3 application of forces and with the interior ring 211 ring limits of uniform expansion embossing hub head 20 mat, make the friction drag area of the utility model structure when brake big more than traditional two sectional type brake facing, and the point of application that produces is also good with uneven 2 force mechanisms than conventional confguration, reaches with the bigger brake strength and the average application of force to produce braking effect preferably.

Two, this reality has new structure to open the roof pressure mode with triadic mean when brake, so brake shoes 11 can evenly absorb each position inertia strength of spending hub head 20 to be produced of rotating and braked with the time in interior ring 211 when brake, can the shortest time reach the brake purpose when making brake, the generation of attenuating personnel accident, and improve the brake under-sensitive shortcoming that traditional two sectional type brake structure 30 produces significantly.

In sum, drum-type brake of the present utility model not only can improve critical defects such as the conventional confguration braking effect is relatively poor, brake sensitivity deficiency, issuable accident in the time of more can reducing personnel because of brake.

The drawing brief description:

Fig. 1 is traditional two sectional type brake structure installation site scheme drawing.

Fig. 2 is the operating principle scheme drawing of traditional two sectional type brake structure.

Fig. 3 is the unitized construction schematic perspective view of a kind of preferred embodiment of the utility model.

Fig. 4 is the structural upright decomposing schematic representation of the utility model preferred embodiment.

Fig. 5 is the brake shoes in the foregoing description and the schematic perspective view of triangle convex.

Fig. 6 is the operating principle scheme drawing of the foregoing description.

Fig. 7 is the local location action form cutaway view of the foregoing description.

The utility model will be described in further detail as follows in conjunction with the accompanying drawings:

See also the structure assembling morphology shown in Fig. 3,4,5, drum-type brake of the present utility model is mainly based on a syllogic brake structure 10, again main body is embedded in the interior ring 211 of 21 central concave of flower hub head 20 side rings, wherein colored hub head 20 centers are provided with a screw axostylus axostyle 22, and it is inserted in ball bearing of main shaft in the central siphon that encircles in the colored hub head 20 in 211 after running through cover unification ball bearing of main shaft (the figure end shows) again; And a syllogic brake structure 10 is inserted in being assembled into a circular gasket 13 central circular perforation 131 is inserted in and arriving side by side on the screw axostylus axostyle 22 in the flower hub head 20 behind ring 211 bottoms of body again on screw axostylus axostyle 22; Syllogic brake structure 10 is formed a triangle hollow circle by three circular arc brake shoes 11, and at triangle hollow part cover unification triangle convex 112, outer ring surface then is provided with a conduit 115 along anchor ring, and in conduit hitch one circular clasp 113, then respectively be provided with a guide hole 111 on brake shoes 11 two sides, and triangle convex 112 is a triangle body, it simultaneously is protruding with a round bar shape couple axle 1121, Xiang Duanzai is convexly equipped with a square pullover 1122, offer the perforation 114 before and after running through again again at triangle convex 112 centers, and utilize perforation 114 to be inserted in the screw axostylus axostyle 22, syllogic brake structure 10 is inserted in the interior ring 211 of colored hub head 20; After be inserted in again at syllogic brake structure 10 relatively at opposite side fit one lamellar bodies 12 of flower hub head 20 directions, lamellar body 12 is a difform fixed plate 121, be connected with a baffle ring 123 and three road position guiding rods 124 on the one side, and offer a trepanning 125 on the baffle ring 123 formed inner ring surfaces, one end of fixed plate 121 offers several circular fixed orifices 122, wherein trepanning 125 is the couple axle 1121 for protrusion in the triangle convex 112, pullover 1122 and screw axostylus axostyle 22 pass, position guiding rod 124 on the fixed plate 121 then embeds in the guide hole 111 of brake shoes 11, to the ring limit that embeds back fixed plate 121 upper baffle rings 123 outer ring positions and flower hub head side ring 21 mutually by touching; And couple axle 1121 is after passing fixed plate 121, square grooving 141 fits of offering at sheet 14 centers are pulled in pullover 1122 of its top is connected brake cable with one rectangular curved district, and screw in again a hold-doun nut 221 on screw axostylus axostyle 22 with sealed location, be inserted in a torque spring 15 behind the location, close with fixed plate 121 1 side covers of a cover plate 16 that cooperates fixed plate 121 sizes again lamellar body 12, and with several Locking screw 17 sealed two lamellar bodies; Wherein cover plate 16 is a projection one circular convex body 161 circle section bodies, locating to be provided with a perforation 162 in the middle of convex body 161 discs passes for screw axostylus axostyle 22, the below also forms a breach, convex body 161 is for providing the space that covers, its below indentation, there is then bent with one of torque spring 15 and is fastened, the curved button of another of torque spring 15 then is fastened on an end of pulling sheet 14, to cover plate 16 cover locks again in that to revolve several hold-doun nuts 221 on the screw axostylus axostyle 22 sealed on convex body 161 lateral surfaces, even if form a complete drum-type brake of the present utility model.

See also Fig. 6, shown in the structure partial action diagram of Fig. 7, action feature of the present utility model be utilize integral structure to be installed in the wheel center of motorcycle and with body construction affixed after, utilize the pulling of the brake cable application of force and drive and pull sheet 14 displacements, the grooving 141 of pulling sheet 14 this moment and be its center of mat rotates pullover 1122 on triangle convexs 112 in the lamellar bodies 12 and will have torsion bullet rings 15 extruding of elastic force, triangle convex 112 is pulled sheet 14 and is rotated the brake shoes 11 that just makes after the rotation its three projections can circular movement jack-up be fitted in triangle convex 112 edges originally and expand (operating position shown in Fig. 6 solid line position) outward, and an end of brake shoes 11 to be the position guiding rod 124 of mat fixed plate 121 penetrate guide hole 111 forms rotating fulcrums, one end then struts with the expansion of circular arc direction and the clasp 113 that will be set on syllogic brake structure 10 outer shrouds of taking advantage of a situation, when ring 211 encircles limits in brake shoes 11 is expanded to colored hub head 20, just its ring limit of urgent roof pressure and produce a huge friction force and make the colored hub head 20 in rotating stop operating, and brake shoes 11 all is subjected to the location of position guiding rod 124 and can not produce slip; After stopping operating to flower hub head 20, just mat loosens brake cable and the utility model structure Central Plains herbal classic is pulled the torque spring 15 of sheet 14 crimps and the clasp 113 that draws back through brake shoes 11 expansions is produced bounce is pushed spanner 14, syllogic brake shoes 11 and in-to-in triangle convex 112 thereof get back to original position to finish whole brake.

Claims

1, a kind of drum-type brake, it is to embed a syllogic brake structure on the screw axostylus axostyle in the ring in the first side of wheel center flower hub of bicycle, it is characterized in that:

2, drum-type brake as claimed in claim 1, it is characterized in that: the wherein expansion of brake facing and triangle convex body design, can cooperate required condition make with four or more the required angle of brake shoes fit brake facing number projection and carry out the brake structure that the central term companding is opened with above-mentioned structural group dress, acting characteristic.