CN202266615U

CN202266615U - Novel drum brake

Info

Publication number: CN202266615U
Application number: CN2011203340168U
Authority: CN
Inventors: 许志明; 许文涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-09-07
Filing date: 2011-09-07
Publication date: 2012-06-06
Anticipated expiration: 2021-09-07

Abstract

The utility model discloses a novel drum brake, which comprises a casing, a pair of brake shoes arranged in the casing, a reset element and a brake arm assembly, wherein the reset element and the brake arm assembly are connected between the pair of brake shoes. One ends of the brake shoes are rotatably located in the casing, a brake wheel driven by the brake arm to rotate is arranged between the end gaps at the other ends of the pair of brake shoes, a roller is respectively in butting connection between the brake wheel and the end faces of the brake shoes on two sides of the brake wheel, and a limit structure preventing the roller form dislocating is arranged on the brake wheel. The novel drum brake improves the structure driving the brake shoes to expand and arranged in the drum brake, changes the working method that an original drum brake adopts a cam to directly drive the brake shoes to expand, effectively reduces abrasion, prolongs service life and improves brake effect and brake safety of vehicles.

Description

A kind of novel drum is stopped

Technical field

The utility model relates to a kind of drum and stops.

Background technique

Drum is stopped and has been applied in above the automobile nearly centurial history, but because its reliability and powerful braking force make drum brakes still be configured on many vehicles now.As shown in Figure 1, the most existing drum is stopped and mainly is made up of shell 01, a pair of brake shoes 02, brake cam 05, brake rocker 03 and reset components 04.During braking, brake rocker drives brake cam and rotates, and brake cam forces brake shoes 02 expansion and contacts with shell 01, produces friction and then realizes brake, after the end of braking, relies on reset components that brake shoes 02 is retracted original position.In the braking process; Between brake shoes 02 and shell 01, produce the wearing and tearing, can produce wearing and tearing equally between brake cam and the brake shoes, and these wearing and tearing concentrate on all the time on the several points or face of brake cam; Greatly shortened the working life of brake cam; In addition, existing drum is stopped and is also existed braking moment little, the shortcoming that braking effect is poor, the car brakeing coasting distance is big.Technician's improvement of stopping to drum at present mainly concentrates on brake shoes and the shell, to brake cam and to drive the architecture advances of brake shoes expansion very few for it, therefore rouses the existing above-mentioned defective of stopping and fails effectively to be solved always.

Summary of the invention

The utility model problem to be solved just provides a kind of novel drum and stops; Structure to rousing the internal drive brake shoes expansion of stopping is improved; Changing original drum stops and adopts cam directly to drive the working method of brake shoes expansion; Effectively reduce wear, prolong its working life, improve car brakeing effect and braking safety.

For solving the problems of the technologies described above; The utility model adopts following technological scheme: a kind of novel drum is stopped; Comprise shell, be located at the interior a pair of brake shoes of shell, be connected this reposition element between the brake shoes and brake arm assembly; This to an end rotating position of brake shoes in the enclosure; It is characterized in that: be provided with the brake wheel by brake arm assembly rotary driving between this end gap to the brake shoes the other end, each butt has roller between the brake shoes end face of brake wheel and both sides, and brake wheel is provided with the limit structure that prevents the roller dislocation.

Further, said limit structure comprises the positioning plate that is located at respectively on the axial both ends of the surface of brake wheel, and the two ends of said roller are provided with axial raised roll pin, and said positioning plate is provided with the spacing hole that supplies roll pin to radially slide along brake wheel; The edge of said brake wheel is provided with the spacing edge face that cooperates the butt roller with the brake shoes end face.

Further, said spacing edge face comprises the rotational slide edge face that rotation that roller rotates drives the edge face and supplies roller to roll that promotes, and said rotation drives that arc transition is connected between edge face and the rotational slide edge face.

Further, it is the arc surface of indent that said rotation drives the edge face, and said rotational slide edge face is the arc surface of evagination.

Further, connect through axial connecting plate between two positioning plates.

Further, said spacing hole is a waist shaped hole.

Further, said brake arm assembly comprises brake rocker and the live axle that is connected with brake rocker, and said live axle one end runs through and connects brake wheel and two positioning plates.

Further; The part that said live axle runs through brake wheel and two positioning plates is a cuboid; The positioning plate center has two fan-shaped positioning holes that communicate and is used to cooperate cuboid to realize the spacing rotation of two positioning plates, wherein is provided with the elastic reset structure between a positioning plate and the driveshaft end; In braking or the braking releasing process, the elastic reset structure acts on roller through positioning plate, makes to have the restoring force that the rotation pointed to drives the edge face on the roller all the time.

Further, said elastic reset structure is the torsion spring of cross-under between positioning plate and driveshaft end.

Further, a side of said brake shoes end is provided with spacing block teeth, and the interior edge face of spacing block teeth is the circular arc of indent.Prevent that roller is extruded between brake wheel and brake shoes end face.

The beneficial effect of the utility model:

Original drum is stopped and is adopted cam directly to drive the brake shoes expansion, produces sliding friction between cam and the brake shoes, and friction concentrates on the several points or face of cam all the time, causes cam wear serious, thereby shortens its working life; The principle of the utility model is: the brake arm assembly drives the brake wheel rotation; Brake wheel outwards pushes against roller; Drive the brake shoes expansion by roller, the friction that produces between roller and brake wheel and the brake shoes end face belongs to rolling friction, and it is much smaller that its frictional force is compared sliding friction; And fretting wear is not concentrated on certain several point or face of roller; Thereby reduced the wearing and tearing of component, made drum stop and still have insensitivity preferably after the use for a long time, prolonged the working life that drum is stopped; In addition, adopt roller to drive brake shoes, increased braking moment, the vehicle braked effect is strengthened, and the braking coasting distance shortens greatly.

Description of drawings

Below in conjunction with accompanying drawing the utility model is done further explanation:

The structural representation that Fig. 1 stops for existing drum;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is the assembling schematic representation of brake wheel, the gaily decorated basket, roller;

Fig. 4 is the preferred structure schematic representation of the utility model;

Fig. 5 is the principle schematic one of the utility model;

Fig. 6 is the principle schematic two of the utility model.

Embodiment

With reference to Fig. 2-3; A kind of novel drum is stopped; Comprise shell 1, be located at a pair of brake shoes 2 in the shell 1, be connected this to reposition element between the brake shoes 23 and brake arm assembly, this in shell 1, is provided with the brake wheel 7 by brake arm assembly rotary driving to an end rotating position of brake shoes 2 between this end gap to brake shoes 2 the other ends; Each butt has roller 71 between brake shoes 2 end faces of brake wheel 7 and both sides, and brake wheel 7 is provided with the limit structure that prevents roller 71 dislocations.Limit structure comprises the positioning plate 50 that is located at respectively on the brake wheel 7 axial both ends of the surface, and the two ends of said roller 71 are provided with axial raised roll pin 711, and said positioning plate 50 is provided with the spacing hole 51 that supplies roll pin 711 to radially slide along brake wheel 7; The edge of said brake wheel 7 is provided with the spacing edge face that cooperates butt roller 71 with brake shoes 2 end faces; Spacing edge face comprises the rotational slide edge face 73 that rotation that roller 71 rotates drives edge face 72 and supplies roller 71 to roll that promotes, and said rotation drives that arc transition is connected between edge face 72 and the rotational slide edge face 73; Wherein rotation driving edge face 72 is the arc surface of indent, and said rotational slide edge face 73 is the arc surface of evagination; Connect through axial connecting plate 53 between the piece positioning plate 50, spacing hole 51 adopts waist shaped hole.

The brake arm assembly comprises brake rocker 41 and the live axle 42 that is connected with brake rocker 41, and said live axle 42 1 ends run through and connect brake wheel 7 and two positioning plates 50.

The part that live axle 42 runs through brake wheel 7 and two positioning plates 50 is a cuboid 421; Positioning plate 50 centers have two fan-shaped positioning holes 52 that communicate and are used to cooperate cuboid 421 to realize the spacing rotation of two positioning plates 50, wherein are provided with the elastic reset structure between a positioning plate 50 and live axle 42 ends; In braking or the braking releasing process, the elastic reset structure acts on roller 71 through positioning plate 50, makes to have the restoring force that the rotation pointed to drives edge face 72 on the roller 71 all the time; The elastic reset structure is the torsion spring 6 of cross-under between positioning plate 50 and live axle 42 ends.

With reference to Fig. 4, the vehicle of running at high speed needs powerful braking moment when carrying out braking; Be prone to cause roller 71 to be extruded internally; For avoiding this situation to take place, a side of brake shoes 2 ends is provided with spacing block teeth 21, and the interior edge face of spacing block teeth 21 is the circular arc of indent; Can prevent effectively that roller 71 is extruded between brake wheel 7 and brake shoes 2 end faces, thereby guarantee braking safety.

The utility model principle:

With reference to Fig. 5,6, it is initial to implement braking, and the brake arm assembly drives brake wheel 7 rotations; Rotation drives edge face 72 and promotes roller 71 rotations, and roller 71 is a turning point with fulcrum A, rolls gradually to get into rotational slide edge face 73; After roller 71 got into rotational slide edge face 73 fully, along with the increase of rotational slide edge face 73 radians, roller 71 strutted to both sides gradually; Arc until reaching rotational slide edge face 73 ejects, and reaches maximum braking moment.Can know from above-mentioned principle: the friction that produces between roller 71 and brake wheel 7 and brake shoes 2 end faces belongs to rolling friction; It is much smaller that its frictional force is compared sliding friction; And fretting wear is not concentrated on certain several point or face of roller 71; Thereby reduced the wearing and tearing of component, made drum stop and still have insensitivity preferably after the use for a long time, prolonged the working life that drum is stopped; In addition, adopt roller 71 to drive brake shoes 2, increased braking moment, the vehicle braked effect is strengthened, and the braking coasting distance shortens greatly.

Outside the above-mentioned preferred embodiment; The utility model also has other mode of execution; Those skilled in the art can make various changes and distortion according to the utility model, only otherwise break away from the spirit of the utility model, all should belong to the defined scope of the utility model accompanying claims.

Claims

1. a novel drum is stopped; Comprise shell (1), be located at the interior a pair of brake shoes (2) of shell (1), be connected this reposition element (3) and brake arm assembly between the brake shoes (2); This to an end rotating position of brake shoes (2) in shell (1); It is characterized in that: be provided with brake wheel (7) between this end gap by brake arm assembly rotary driving to brake shoes (2) the other end; Each butt has roller (71) between brake shoes (2) end face of brake wheel (7) and both sides, and brake wheel (7) is provided with the limit structure that prevents roller (71) dislocation.

2. a kind of novel drum according to claim 1 is stopped; It is characterized in that: said limit structure comprises the positioning plate (50) that is located at respectively on the axial both ends of the surface of brake wheel (7); The two ends of said roller (71) are provided with axial raised roll pin (711), and said positioning plate (50) is provided with the spacing hole (51) that supplies roll pin (711) to radially slide along brake wheel (7); The edge of said brake wheel (7) is provided with the spacing edge face that cooperates butt roller (71) with brake shoes (2) end face.

3. a kind of novel drum according to claim 2 is stopped; It is characterized in that: said spacing edge face comprises the rotational slide edge face (73) that rotation that roller (71) rotates drives edge face (72) and supplies roller (71) to roll that promotes, and said rotation drives that arc transition is connected between edge face (72) and the rotational slide edge face (73).

4. a kind of novel drum according to claim 3 is stopped, and it is characterized in that: said rotation drives edge face (72) and is the arc surface of indent, and said rotational slide edge face (73) is the arc surface of evagination.

5. stop according to claim 2 or 3 or 4 described a kind of novel drums, it is characterized in that: connect through axial connecting plate (53) between two positioning plates (50).

6. stop according to claim 2 or 3 or 4 described a kind of novel drums, it is characterized in that: said spacing hole (51) is a waist shaped hole.

7. stop according to claim 2 or 3 or 4 described a kind of novel drums; It is characterized in that: said brake arm assembly comprises brake rocker (41) and the live axle (42) that is connected with brake rocker (41), and said live axle (42) one ends run through and connect brake wheel (7) and two positioning plates (50).

8. a kind of novel drum according to claim 7 is stopped; It is characterized in that: the part that said live axle (42) runs through brake wheel (7) and two positioning plates (50) is cuboid (421); Positioning plate (50) center has two fan-shaped positioning holes (52) that communicate and is used to cooperate cuboid (421) to realize the spacing rotation of two positioning plates (50), wherein is provided with the elastic reset structure between a positioning plate (50) and live axle (42) end; In braking or the braking releasing process, the elastic reset structure acts on roller (71) through positioning plate (50), makes to have the restoring force that the rotation pointed to drives edge face (72) on the roller (71) all the time.

9. a kind of novel drum according to claim 8 is stopped, and it is characterized in that: said elastic reset structure is the torsion spring (6) of cross-under between positioning plate (50) and live axle (42) end.

10. stop according to claim 2 or 3 or 4 described a kind of novel drums, it is characterized in that: a side of said brake shoes (2) end is provided with spacing block teeth (21), and the interior edge face of spacing block teeth (21) is the circular arc of indent.