Hydraulic drum brake

Abstract

The utility model relates to the technical field of drum brakes, and discloses a hydraulic drum brake which comprises a drum brake shell and brake shoes symmetrically arranged on the inner side of the drum brake shell, one ends of the brake shoes are arranged on a fixed core shaft in a pivoted mode, and the other ends of the brake shoes abut against driving ejector rods symmetrically arranged on the two sides of a hydraulic driving assembly. A reset spring is arranged on the brake shoe, so that the two driving ejector rods drive the brake shoe to open and close for braking to have reset driving potential, and the hydraulic driving assembly is composed of a driving base, the driving ejector rods which are telescopically arranged above the driving base and abut against the opening and closing ends of the brake shoe in a matched mode, and an oil inlet structure arranged at the bottom of the driving base. An abutting limiting structure is further arranged between the driving ejector rod and the opening and closing end of the brake shoe. The problem that after an existing drum brake device is used for a long time, manual adjustment is inconvenient due to the fact that the brake clearance is increased is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to drum brake technology field, concretely relates to a hydraulic drum brake. BACKGROUND

[0002] Most of the hub brakes of electric motorcycles adopt mechanical drum brake devices, for example, CN219927903U discloses a novel electric vehicle hub brake structure, which mainly drives the shoe block to open and tightly abut on the brake drum through a cam and a rocker lever, so that the brake shoe block and the brake drum produce friction to form a braking force, and the electric motorcycle achieves the purpose of speed reduction and parking;

[0003] However, after long-term use of the drum brake with the above structure, the brake line will be elongated under the action of the elastic force, and the gap between the shoe block assembly and the hub will be enlarged after long-term wear, at this time, the braking performance will be reduced and the brake will fail, and the gap between the brake shoe block and the brake drum is usually manually adjusted, which is very inconvenient and difficult to ensure the timeliness and accuracy of the adjustment. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a hydraulic drum brake, which overcomes the problem of inconvenient manual adjustment due to the increase of the brake gap after long-term use of the existing drum brake.

[0005] In order to achieve the above purpose, the following technical scheme is adopted in the present application.

[0006] The utility model relates to a hydraulic drum brake, which comprises a drum brake shell and brake shoes symmetrically arranged on the inner side of the drum brake shell, one end of the brake shoe is pivotally arranged on a fixed core shaft, the other end abuts on the driving top rod symmetrically arranged on the two sides of the hydraulic drive assembly, a return spring is arranged on the brake shoe to drive the two driving top rods to drive the brake shoe to open and close, the hydraulic drive assembly comprises a driving seat, a driving top rod telescopically arranged above the driving seat and abutting on the opening and closing end of the brake shoe, and an oil inlet structure arranged at the bottom of the driving seat, and an abutting limiting structure is further arranged between the driving top rod and the opening and closing end of the brake shoe.

[0007] Preferably, the abutting limiting structure comprises a limiting groove arranged at the top of the driving top rod and a limiting protrusion arranged at the opening and closing end of the brake shoe and adapted to the limiting groove.

[0008] Preferably, the limiting groove and the limiting protrusion are adapted to the one-dot or cross-shaped structure.

[0009] Preferably: the driving seat is an integral structure, the driving seat is provided with a driving top rod and an oil inlet structure adapted to communicate with a hydraulic cavity, the driving seat is provided with a driving hole adapted to the driving top rod, the driving seat is symmetrically provided with a connecting seat below, the connecting seat is provided with a threaded hole, the driving seat is fixedly connected with the drum brake shell through the threaded hole, the driving seat is further provided with an oil inlet connecting seat at the bottom, the oil inlet connecting seat is provided with an oil inlet hole adapted to the oil inlet structure, and the hydraulic cavity is composed of the driving hole and the oil inlet hole.

[0010] Preferably: the oil inlet connecting seat is vertically arranged outside the connecting seat, is adapted to be worn in the connecting hole of the drum brake shell, and is sealingly connected with the oil inlet structure outside the drum brake shell.

[0011] Preferably: the oil inlet structure is adapted to be connected with the oil inlet connecting seat through an oil pipe connecting piece and a sealing ring, and the oil pipe connecting piece is provided with an inner hole and a side hole communicating with the oil inlet connecting hole and the oil inlet structure.

[0012] Preferably: the hydraulic drive assembly further comprises a reset member connecting the two driving top rods, one side of the driving top rod is provided with a connecting boss adapted to an annular groove and a reset structure, and the annular groove is provided with a sealing structure adapted to be sleeved therein.

[0013] Preferably: the hydraulic drive assembly further comprises an exhaust structure, the exhaust structure is composed of an exhaust nozzle arranged at the top end of the oil pipe connecting piece and a cap adapted to cover the exhaust nozzle.

[0014] Preferably: the top of the oil pipe connecting piece is provided with a connecting hole communicating with the inner hole, and the connecting hole is adapted to be connected with the exhaust nozzle.

[0015] Compared with the prior art, the utility model has the beneficial effects that:

[0016] The utility model discloses a hydraulic drive assembly is arranged at one end of the brake shoe of the drum brake shell, and the brake shoe is driven to open and close the brake to the two sides, the driving top rod that the hydraulic drive assembly synchronously drives is symmetrically arranged and is in abutment with the opening and closing end of the brake shoe, and the brake shoe opening and closing end is synchronously opened to brake by the synchronous ejection of the two sides, so that the driving force is large and uniform, the brake hand feeling is soft, and the brake effect is good.

[0017] The connecting seat is fastened and connected with the drum brake shell through the symmetrical connecting seat arranged below the driving seat, and the fastening is firm; the driving through hole for the symmetrical synchronous extension and contraction of the two driving jacks is arranged above the driving seat, the opening and closing ends of the brake shoe abut on the two driving jacks, and the lower part is placed on the connecting seat, so that the brake shoe opening and closing movement has a guide support, and the brake shoe opening and closing movement is stable and reliable in support.

[0018] The oil inlet structure is arranged outside the drum brake shell and separated from the brake shoe arranged inside the drum brake shell, so that the oil way connection is facilitated, and the brake failure caused by the oil pollution of the brake shoe is prevented.

[0019] The connecting hole in communication with the inner hole is arranged on the top of the oil pipe connecting piece to directly connect the exhaust nozzle, so that the driving seat structure and the machining process are simplified, and the machining cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a three-dimensional structure schematic diagram of the utility model;

[0021] Figure 2 is an assembly explosion schematic diagram of the utility model;

[0022] Figure 3 is a hydraulic drive assembly explosion diagram of the utility model;

[0023] Figure 4 is a hydraulic drive assembly cross section schematic diagram of the utility model.

[0024] The drawings are as follows: drum brake shell 1, brake shoe 2, return spring 3, fixed core shaft 4, hydraulic drive assembly 5, driving seat 51, driving through hole 511, oil inlet through hole 512, connecting seat 513, threaded connection hole 514, oil inlet connecting seat 515, driving jack 52, annular groove 521, connecting boss 522, sealing structure 53, return member 54, oil pipe connecting piece 55, sealing ring 56, abutting limiting structure 6, limiting groove 61, limiting protrusion 62, oil inlet structure 7, exhaust structure 8, exhaust nozzle 81, cap 82. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the utility model, the utility model will be further described in detail below in combination with the drawings, and the embodiment is only used for explaining the utility model and does not constitute the limitation on the protection scope of the utility model.

[0026] In the description of the utility model, it is understood that the directions or position relations indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right" and the like are the directions or position relations shown based on the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated combination or element must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as a limitation on the utility model.

[0027] The utility model will be further described below according to the drawings and in conjunction with embodiments.

[0028] Figures 1-4 As shown is a kind of hydraulic drum brake, including drum brake shell 1 and the brake shoe 2 of symmetrical setting in the inside of drum brake shell 1, brake shoe 2 one end is pivotally arranged on fixed core shaft 4, the other end is abutted in the drive top rod 52 of symmetrical setting in the two sides of hydraulic drive assembly 5, brake shoe 2 is equipped with reset spring 3 to make two drive top rod 52 drive brake shoe 2 open and close brake has reset drive potential, hydraulic drive assembly 5 is by drive seat 51, the drive top rod 52 of being telescopically arranged in drive seat 51 top and the oil inlet structure 7 of being arranged in the bottom of drive seat 51 are adapted to abut brake shoe 2 open and close end, drive top rod 52 and brake shoe 2 open and close end between still be equipped with abutment limiting structure 6;Abutment limiting structure 6 is by the limiting groove 61 of being arranged in the top of drive top rod 52 and the limiting protrusion 62 of being arranged in brake shoe 2 open and close end and limiting groove 61 adaptation is made of;Limiting groove 61 and limiting protrusion 62 are equipped with adaptation character or cross type structure;By the one end of brake shoe 2 of setting drive brake shoe 2 to the two sides open and close brake of one side of drum brake shell 1, by hydraulic drive assembly 5 synchronous drive the drive top rod 52 of being symmetrically arranged and abutting brake shoe 2 open and close end, make brake shoe open and close end synchronous opening for brake by the synchronous ejection of the two sides of drive top rod 52, pushing force is big and uniform, brake hand feeling is soft, and brake effect is good;The ejection distance of two drive top rod 52 is dynamically regulated by the wear gap between brake shoe and brake hub, without artificial adjustment, with the function of self-centering, there is no partial brake, drag brake, can still guarantee the sensitivity of brake when shoe brake pad wears;By setting abutment limiting structure 6 between drive top rod 52 and brake shoe 2 abutting open and close end, ensure that brake shoe 2 is adjusted flexibly, reliably and stably in abutting force transmission part during open and close brake, effectively prevent slipping;Wherein limiting groove 61 and limiting protrusion 62 can also be arranged in other, such as composite groove or plum blossom type structure.

[0029] An alternative embodiment: as Figures 3-4As shown, the drive seat 51 is an integral structure, the drive seat 51 is provided with a hydraulic cavity communicating with the drive top rod 52 and the oil inlet structure 7, the drive seat 51 is provided with a drive hole 511 communicating with the drive top rod 52, the drive seat 51 is provided with a connecting seat 513, the connecting seat 513 is provided with a threaded hole 514, the drive seat 51 is fixedly connected with the drum brake shell 1 through the threaded hole 514, and the drive seat 51 is further provided with an oil inlet connecting seat 515, the oil inlet connecting seat 515 is provided with an oil inlet hole 512 communicating with the oil inlet structure 7, and the hydraulic cavity is composed of the drive hole 511 and the oil inlet hole 512;

[0030] The connecting seat 513 is provided below the drive seat 51 and is fixedly connected with the drum brake shell 1 through bolts, and the connection is firm; the drive hole 511 is provided above the drive seat 51 and is used for the symmetric synchronous extension and retraction of the two drive top rods 52, the two sides of the opening and closing end of the brake shoe 2 abut against the two drive top rods 52, and the lower part is placed on the connecting seat 513, so that the brake shoe 2 has a guide support during opening and closing movement, and the opening and closing movement of the brake shoe is stable and reliable.

[0031] An optional embodiment is shown in Figure 3 , 4 The oil inlet connecting seat 515 is vertically arranged at the bottom of the connecting seat 513, is adapted to be worn in the connecting hole of the drum brake shell 1, and is sealingly connected with the oil inlet structure 7 outside the drum brake shell 1. By vertically arranging the oil inlet connecting seat 515 at the bottom of the connecting seat 513, the oil inlet structure 7 is arranged outside the drum brake shell 1 and is separated from the brake shoe 2 arranged inside the drum brake shell 1, so that the oil circuit connection is facilitated, and the brake failure caused by oil pollution of the brake shoe is prevented; the oil inlet connecting seat 515 can also be arranged on one side of the connecting seat 513 and is led out from the side of the shell.

[0032] An optional embodiment is shown in Figure 3 , 4 The oil inlet structure 7 is connected with the oil inlet connecting seat 515 through the oil pipe connecting piece 55 and the sealing ring 56, the oil pipe connecting piece 55 is provided with an inner hole and a side hole communicating with the oil inlet connecting hole 512 and the oil inlet structure 7; preferably, the oil pipe connecting piece 55 is provided as a connecting bolt structure, one end of the oil pipe connecting piece 55 is connected with the threaded hole provided on the oil inlet connecting seat 515 through threads, the threaded hole is communicated with the oil inlet connecting hole 512, and the other end of the oil pipe connecting piece 55 is provided as a flange face hexagonal structure; the threaded rod of the oil pipe connecting piece 55 is provided with a central inner hole and a side hole communicated with the central inner hole for the entry and circulation of hydraulic oil.

[0033] An optional embodiment is shown in Figure 3 , 4As shown, the hydraulic drive assembly 5 further comprises a reset member 54 connecting the two drive jacks 52, and the drive jack 52 is provided with an annular groove 521 and a connecting boss 522 adapted to the reset structure 54, and the annular groove 521 is provided with a sealing structure 53 adapted and sleeved. By arranging the reset member 54 connected inside the two drive jacks 52, the two drive jacks 52 can be quickly reset after ejection braking.

[0034] An optional embodiment is as follows: Figures 1-4 As shown, the hydraulic drive assembly 5 further comprises an exhaust structure 8, which comprises an exhaust nozzle 81 arranged at the top end of the oil pipe connecting piece 55 and a cap 82 adapted to cover the exhaust nozzle 81; preferably, the top of the oil pipe connecting piece 55 is provided with a connecting hole communicated with the inner hole, and the connecting hole is adapted to connect the exhaust nozzle 81; by arranging the connecting hole communicated with the inner hole at the top of the oil pipe connecting piece 55 to directly connect the exhaust nozzle 81, the structure and processing technology of the drive seat 51 are simplified, and the processing cost is saved; wherein the exhaust structure 8 can also be arranged on one side of the drive seat 51 to achieve the effect of exhaust, liquid addition and pressure relief.

[0035] The embodiments of the utility model discloses the preferable embodiment, but is not limited to this, the ordinary skill in the art, the person, easily according to the above-mentioned embodiment, the spirit of the utility model is appreciated, and different extension and change are made, but as long as not departing from the spirit of the utility model, all are within the protection scope of the utility model.

Claims

1. A hydraulic drum brake comprising a drum brake housing (1) and a brake shoe (2) symmetrically arranged inside the drum brake housing (1), characterized in that: The brake shoe (2) is pivotally arranged at one end of the fixed core shaft (4), and the other end is abutted on the drive top rod (52) symmetrically arranged on both sides of the hydraulic drive assembly (5). The brake shoe (2) is provided with a reset spring (3) to drive the two drive top rods (52) to drive the brake shoe (2) to open and close the brake with reset drive potential. The hydraulic drive assembly (5) is composed of a drive seat (51), a drive top rod (52) which is telescopically arranged above the drive seat (51) and abuts on the opening and closing end of the brake shoe (2), and an oil inlet structure (7) arranged at the bottom of the drive seat (51). The drive top rod (52) and the opening and closing end of the brake shoe (2) are further provided with an abutting limiting structure (6).

2. The hydraulic drum brake of claim 1 wherein: The abutting limiting structure (6) is composed of a limiting groove (61) arranged at the top of the drive top rod (52) and a limiting protrusion (62) arranged at the opening and closing end of the brake shoe (2) and matched with the limiting groove (61).

3. The hydraulic drum brake of claim 2 wherein: The limiting groove (61) and the limiting protrusion (62) are adapted to the shape of a straight line or a cross.

4. The hydraulic drum brake of claim 1 wherein: The drive seat (51) is an integral structure. The drive seat (51) is provided with a hydraulic cavity communicating with the drive top rod (52) and the oil inlet structure (7). The top of the drive seat (51) is provided with a drive through hole (511) matched with the drive top rod (52). The bottom of the drive seat (51) is symmetrically provided with a connecting seat (513). The connecting seat (513) is provided with a threaded connecting hole (514). The drive seat (51) is fixedly connected with the drum brake shell (1) through the threaded connecting hole (514). The bottom of the drive seat (51) is further provided with an oil inlet connecting seat (515). The oil inlet connecting seat (515) is provided with an oil inlet through hole (512) matched with the oil inlet structure (7). The hydraulic cavity is composed of the drive through hole (511) and the oil inlet through hole (512).

5. The hydraulic drum brake of claim 4 wherein: The oil inlet connecting seat (515) is vertically arranged outside the connecting seat (513) at the bottom. It is matched with the connecting hole of the drum brake shell (1) and is sealingly connected with the oil inlet structure (7) outside the drum brake shell (1).

6. The hydraulic drum brake of claim 5 wherein: The oil inlet structure (7) is connected with the oil inlet connecting seat (515) through the oil pipe connecting piece (55) and the sealing ring (56). The oil pipe connecting piece (55) is provided with an inner hole and a side hole communicating with the oil inlet connecting hole (512) and the oil inlet structure (7).

7. The hydraulic drum brake of any one of claims 1-6, wherein: The hydraulic drive assembly (5) further comprises a reset member (54) connecting the two drive top rods (52). One side of the drive top rod (52) is provided with a connecting boss (522) matched with the annular groove (521) and the reset structure (54). The annular groove (521) is provided with a sealing structure (53) matched and sleeved inside.

8. The hydraulic drum brake of claim 7 wherein: The hydraulic drive assembly (5) further comprises an exhaust structure (8). The exhaust structure (8) is composed of an exhaust nozzle (81) arranged at the top of the oil pipe connecting piece (55) and a cap (82) matched and arranged on the exhaust nozzle (81).

9. The hydraulic drum brake of claim 8 wherein: The top of the oil pipe connecting piece (55) is provided with a connecting hole communicating with the inner hole. The connecting hole is connected with the exhaust nozzle (81).

Images