CN108591313B

CN108591313B - Drum brake mechanism

Info

Publication number: CN108591313B
Application number: CN201810635282.0A
Authority: CN
Inventors: 许志明; 许文涛
Original assignee: Changxing Luola Electromechanical Co ltd
Current assignee: Changxing Luola Electromechanical Co ltd
Priority date: 2018-06-20
Filing date: 2018-06-20
Publication date: 2024-04-23
Anticipated expiration: 2038-06-20
Also published as: CN108591313A

Abstract

The invention discloses a drum brake mechanism, which belongs to the technical field of vehicle braking and comprises a shell, wherein a rocker arm used for connecting a brake pull wire is rotatably arranged on the shell, the rocker arm comprises a fixed hinged end and a free rotating end, the fixed hinged end is rotatably arranged on the shell, the drum brake mechanism further comprises a tension spring which generates restoring force for the rocker arm, one end of the tension spring is rotatably connected with the shell, the other end of the tension spring is connected with the free rotating end, the tension spring correspondingly rotates relative to the shell while rotating, and a brake cable mounting piece used for mounting the brake pull wire is rotatably arranged on the shell. According to the invention, the bending problem and the resetting problem of the brake stay wire are improved simultaneously by rotating the brake cable mounting part and the tension spring, so that the service life and the safety of the drum brake are prolonged.

Description

Drum brake mechanism

[ Field of technology ]

The invention relates to a drum brake mechanism, and belongs to the technical field of vehicle braking.

[ Background Art ]

The drum brake mechanism is a mature structure in the existing vehicle brake technology, and mainly comprises a shell and two brake shoes, wherein a rocker arm is rotatably arranged on the shell, the rocker arm is connected with a brake pull wire, and when the brake pull wire is pulled, the rocker arm rotates relative to the shell, so that the two brake shoes are driven to radially shrink or expand.

In a drum brake mechanism, the return of a brake shoe is very important, the return of the brake shoe is mainly realized through the return of a rocker arm, in the prior product, the return of the rocker arm is usually realized on two parts, one is realized through the rebound effect of a torsion spring which is additionally arranged at the rotating end of the rocker arm, and the return is realized through the rebound effect of the torsion spring, and the other is realized through the addition of a long pressure spring on a brake pull wire, wherein the long pressure spring is usually arranged between a shell and the rocker arm, and the two return structures at present have several defects: the return is realized by using the torsion spring and the pressure spring, the corresponding required pulling force is not linear enough, when a brake pull wire is pulled, the initial stage is loose, the later stage needs great pulling force, the hand feel of a user is poor, and when the pressure spring is used, the pressure spring can be compressed and simultaneously twisted after the rocker arm is pulled, and the twisting deformation amount is great after long-term use.

In addition, when the rocker rotates, a certain angle variable exists in the brake stay wire between the rocker and the brake cable mounting piece, when the angle is increased, the brake stay wire rubs in the brake cable tube, so that the resistance is increased, the return of the rocker is blocked, the brake cable is easily broken, and the brake is lost.

[ Invention ]

The invention aims to solve the technical problems of overcoming the defects of the prior art and providing the drum brake mechanism with better return effect, so that the return effect of the rocker arm is better and the service life is longer.

The technical problems are solved, and the invention adopts the following technical scheme:

The utility model provides a drum mechanism of stopping, includes the shell, rotates on the shell and installs the rocking arm that is used for connecting the brake to act as go-between, the rocking arm is including fixed articulated end and free rotation end, and fixed articulated end rotates and installs on the shell, and drum mechanism of stopping still includes the extension spring that produces the restoring effort to the rocking arm, and extension spring one end is connected for the shell rotation, and the other end and the free rotation end of extension spring are connected, and the rocking arm rotates simultaneously, and the extension spring is rotated for the shell is corresponding, still rotates on the shell and installs the brake cable installed part that is used for installing the brake to act as go-between.

According to the invention, the bending problem and the resetting problem of the brake stay wire are improved simultaneously by rotating the brake cable mounting part and the tension spring, so that the service life and the safety of the drum brake are prolonged.

The fixed hinge end is connected with a rotating shaft, the shell is provided with a shaft hole, the rotating shaft is rotatably arranged in the shaft hole, and the outer side of the rotating shaft is provided with a protection part for reducing sediment or water from entering the shaft hole.

The fixed hinge end is connected with a rotating shaft, the shell is provided with a shaft hole, the rotating shaft is rotatably arranged in the shaft hole and driven by the rocker arm to rotate, and a rust removing groove which is axially communicated along the shaft hole is arranged between the outer wall surface of the rotating shaft and the inner wall surface of the shaft hole.

The shell is provided with the bayonet side wall, the bayonet side wall is enclosed to form a bayonet for mounting the vehicle frame, and a buffer part for buffering the impact of the vehicle frame on the bayonet side wall is arranged in the bayonet.

The middle of the shell is provided with a central hole, the inner wall of the central hole is provided with a spacer sleeve, and the spacer sleeve is provided with a connecting shaft hole for installing a connecting shaft. The isolation sleeve is subjected to surface treatment. The isolating sleeve can be made of metal or nonmetal materials which are not easy to rust, such as silicon carbide or tungsten carbide.

The shell is rotatably provided with a first brake shoe and a second brake shoe, a first reset piece is arranged between one end of the first brake shoe and one end of the second brake shoe, the first reset piece comprises an annular spring rod with an opening, the annular spring rod comprises a first fixed end and a second fixed end, the opening is formed between the first fixed end and the second fixed end, the first fixed end is connected with the first brake shoe, and the second fixed end is connected with the second brake shoe.

The shell is provided with a first rotating hole, the rotating piece is rotatably arranged in the first rotating hole, and the tension spring is connected to the rotating piece.

The rotating piece comprises a rotating column, the rotating column is arranged in a first rotating hole, the rotating piece further comprises an adjusting component which is movably connected to the rotating column and used for adjusting the initial length of a tension spring, and the tension spring is connected with the adjusting component.

The protection part comprises a protection cover and a protection convex rib, wherein the protection cover is positioned at the outer side of the rotating shaft, the protection convex rib is arranged on the outer side surface of the shell, the protection cover is connected with the protection convex rib, and the protection cover is arranged on the shell through the protection convex rib.

A rocker arm movable opening is arranged between the protective cover and the outer side face of the shell, and is used for enabling a rocker arm to rotate, and the rocker arm movable opening is located below the shaft hole.

These features and advantages of the present invention will be disclosed in detail in the following detailed description and the accompanying drawings.

[ Description of the drawings ]

The invention is further described with reference to the accompanying drawings:

Fig. 1 is a schematic perspective view of a drum brake according to embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of an explosion structure of a drum brake according to embodiment 1 of the present invention.

Fig. 3 is a schematic diagram of an explosion structure of the drum brake according to embodiment 1 of the present invention.

Fig. 4 is a schematic perspective view of a brake cable mounting member according to embodiment 1 of the present invention.

Fig. 5 is a schematic diagram of the front view of the drum brake (without pulling the brake cable) according to embodiment 1 of the present invention.

Fig. 6 is a schematic diagram showing a front view of a drum brake (pulling a brake cable) according to embodiment 1 of the present invention.

Fig. 7 is a schematic diagram of an explosion structure of the drum brake according to embodiment 1 of the present invention.

Fig. 8 is a schematic perspective view of a rotary shaft according to embodiment 1 of the present invention.

Fig. 9 is a schematic diagram showing a front view of a structure of a rotary shaft and shaft hole in accordance with embodiment 1 of the present invention.

Fig. 10 is a schematic diagram showing an explosion structure of the drum brake according to embodiment 1 of the present invention.

Fig. 11 is a schematic diagram showing an explosion structure of the drum brake according to embodiment 1 of the present invention.

Fig. 12 is a schematic perspective view of a drum brake according to embodiment 2 of the present invention.

Fig. 13 is a schematic diagram showing a front view of a drum brake according to embodiment 2 of the present invention.

Fig. 14 is a schematic diagram of an exploded structure of a drum brake according to embodiment 2 of the present invention.

1. A housing; 11. a shaft hole; 12. a central bore; 121. a boss; 13. a bayonet sidewall; 131. a bayonet; 132. a first side wall; 133. a second side wall; 134. a third side wall; 2. a rocker arm; 21. fixing the hinged end; 211. a connection hole; 22. a free rotating end; 3. a rotation shaft; 31. a connection part; 32. a rotating part; 4. a brake pull line; 5. a brake cable mount; 6. a telescoping sheath; 7. a support sleeve; a1, a tension spring; a2, turning the hole I; a3, a rotating piece; a4, rotating the column; a5, an adjusting part; a6, a screw hole; a7, fastening a nut; a8, a screw rod; a9, connecting the flat position; a10, hanging holes; a11, a first hook; a12, hanging grooves; a13, a second hook; a14, extending lugs; b1, a stay wire rotating part; b2, an installation part; b3, turning the hole II; b4, limiting plates; b5, limiting ports; c1, a buffer piece; c2, a first buffer part; c3, a second buffer part; a buffer C4 and a buffer III; c5, a reinforcement; d1, a rust removing groove; e1, a protective cover; e2, protecting the convex ribs; e3, a protective groove; e4, a straight line segment; e5, a curve section; e6, a rocker arm movable port; e7, limiting walls; f1, a spacer sleeve; f2, an oil storage part; f3, an oil storage port; f4, an oil storage sleeve; f5, a second limiting piece; g1, a first brake shoe; g2, a second brake shoe; g3, a ring spring rod; g4, a first fixed end; g5, a second fixed end; g6, a first jack; g7, a second jack; g8, a limit groove; g9, limiting sheets; g10, a brake shoe body; g11, U-shaped part; g12, limiting flanks; g13, inner bulge; g14, fastening pieces; g15, a second reset piece.

[ Detailed description ] of the invention

The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.

In the following description, the terms such as "inner", "outer", "upper", "lower", "left", "right", etc. are used to indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description of the embodiments and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Example 1.

See fig. 1-11.

The embodiment discloses a drum brake mechanism, which comprises a shell 1, a rocker arm 2 and a brake cable mounting piece 5. The shell 1 is provided with a shaft hole 11 and a central hole 12, and the shell 1 is provided with a bayonet side wall 13, and the bayonet side wall 13 is enclosed to form a bayonet 131. The edge of the central hole 12 is provided with a boss 121, and the boss 121 and the bayonet side wall 13 are both positioned on the outer side surface of the shell 1. The rocker arm 2 includes a fixed hinge end 21 and a free rotation end 22, the fixed hinge end 21 is connected with the rotation shaft 3, and the rotation shaft 3 is rotatably installed in the shaft hole 11, so that the rocker arm 2 is rotatably installed on the housing 1.

In the use state of the drum brake, the frame is installed in the bayonet 131, so that the drum brake is installed on the frame, and the connecting shaft is installed in the central hole 12. The brake cable mounting member 5 mounts the brake cable 4 thereon, thereby mounting the end of the brake cable 4 to the free rotating end 22.

This embodiment provides six independent improvements over the prior art. All the six improvements can be independently implemented, and are not mutually restricted or influenced.

The first improvement scheme is as follows: the drum brake mechanism further comprises a tension spring A1 which generates restoring force to the rocker arm 2, one end of the tension spring A1 is rotationally connected with the shell 1, the other end of the tension spring A1 is connected with the free rotation end 22, and the tension spring A1 correspondingly rotates relative to the shell 1 while the rocker arm 2 rotates.

In this embodiment, the return of the rocker arm 2 is achieved by means of the tension spring A1, and meanwhile, one end of the tension spring A1 in this embodiment can rotate relative to the housing 1, when the rocker arm 2 is pulled by the brake wire 4 and rotates, the tension spring A1 itself will also follow to rotate, in the process that the tension spring A1 rotates and is gradually elongated, although the total resilience force of the tension spring A1 itself tends to increase along the length direction of the tension spring A1, because the angle of the tension spring A1 itself also changes, in the pulling direction of the brake wire 4, the change of the resilience force of the total resilience force of the tension spring A1 in the pulling direction is not large, in other words, the change of the required tension force of the user in the whole process of pulling the brake wire 4 is not large, the whole tension force tends to be linear, so that the problem that the former stroke is pulled loose and the latter stroke is pulled tightly is avoided as much as possible as in the conventional structure, the tension spring A1 plays an automatic adjusting role in this embodiment, so that the whole return effect of the rocker arm 2 is better.

The specific preferred structure is as follows:

In order to realize the relative rotation between the tension spring A1 and the housing 1, in this embodiment, the first rotation hole A2 is preferably formed in the housing 1, and the rotating member A3 is rotatably mounted in the first rotation hole A2, the tension spring A1 is connected to the rotating member A3, in this embodiment, an extension lug a14 is preferably extended from a side portion of the housing 1, and the first rotation hole A2 is formed in the extension lug a 14. So designed, when the free rotating end 22 of the rocker arm 2 rotates in the right direction in fig. 5, the rotating member A3 correspondingly rotates to the right.

In addition, in order to better adjust the initial length of the tension spring A1, the embodiment optimally designs the rotating member A3, and a structure capable of adjusting the initial length of the tension spring A1 is arranged on the rotating member A3, specifically as follows: the rotating member A3 comprises a rotating column A4, the rotating column A4 is rotatably arranged in a first rotating hole A2, the rotating member A3 further comprises an adjusting component A5 which is movably connected to the rotating column A4 and used for adjusting the initial length of the tension spring A1, the tension spring A1 is connected with the adjusting component A5, relative displacement can be generated between the adjusting component A5 and the rotating member A3 along the radial direction of the first rotating hole A2 in the embodiment, the adjusting component A5 is adjusted in the radial direction of the first rotating hole A2, and initial length adjustment of the tension spring A1 is realized, so that initial pretightening force of the tension spring A1 can be adjusted.

The movable connection between the adjusting component A5 and the rotating column A4 in this embodiment is preferably threaded connection, the rotating column A4 is provided with a screw hole A6, the axial direction of the screw hole A6 is consistent with the radial direction of the first rotating hole A2, and the adjusting component A5 is in threaded connection with the rotating column A4 through the screw hole A6 and is fastened through a fastening nut A7. It should be noted that, in other embodiments, the connection between the adjusting member A5 and the rotating post A4 is not limited to a threaded connection, and may be implemented by inserting bolts into a plurality of jacks, and the connection falls within the scope of the present invention.

In this embodiment, the specific structure of the adjusting component A5 includes a screw A8 and a connection flat position A9, a hanging hole a10 is formed in the connection flat position A9, a first hook a11 is formed at one end of the tension spring A1, and the first hook a11 is hung on the hanging hole a10, because the hanging mode is completely rigidly connected, even if the rotating member A3 does not rotate, the first hook a11 of the tension spring A1 can rotate in the hanging hole a 10. Of course, in this embodiment, on the premise that the rotating member A3 can rotate, the rotation frequency of the first hook a11 in the hanging hole a10 can be reduced, so that the wear degree between the first hook a11 and the hanging hole a10 can be reduced.

It should be noted that, the first hook a11 of the tension spring A1 and the rotating member A3 are connected through a hanging hole a10, and in other embodiments, the hanging hole a10 may be a hanging groove a 12.

Meanwhile, in this embodiment, the free rotating end 22 of the rocker arm 2 is provided with a second hanging position, the other end of the tension spring A1 is provided with a second hook a13, the second hook a13 is hung on the second hanging position, and the second hook a13 is connected in a hanging manner, so that the tension spring A1 and the free rotating end 22 of the rocker arm 2 are not completely rigidly connected, and certain rotation can be allowed to occur, and in this embodiment, the second hanging position is preferably in a hanging groove a12 manner, so that the installation is convenient.

The second improvement scheme is as follows: the brake cable mount 5 in this embodiment is rotatably mounted to the housing 1.

Preferably, the mounting member 5 in this embodiment includes a limiting portion, a stay wire rotating portion B1 and a mounting portion B2. The stay wire rotating portion B1 is rotatably mounted on the housing 1, and the mounting portion B2 is rotatably mounted on the housing 1 through the stay wire rotating portion B1. The brake cable 4 is mounted on the mounting portion B2, while the mounting portion B2 and the rocker arm 2 are located on the same side of the housing 1. The limiting part, the stay wire rotating part B1 and the mounting part B2 can be generally connected in an integrated mode. The brake cable 4 is mounted in the mounting portion B2.

Further preferably, in this embodiment, the housing 1 is provided with a second rotation hole B3, the stay wire rotating portion B1 is a rotation shaft, the rotation shaft is rotatably installed in the second rotation hole B3, and the installation portion B2 and the rocker arm 2 are located on the same side of the housing 1. Through the cooperation of No. two commentaries on classics holes B3 and pivot for the stay wire rotation portion B1 is fixed a position in shell 1, in order to stabilize the rotation process of installation department B2, will be when pulling brake and act as go-between 4 the deformation force that brake was acted as go-between 4 and is produced and give installation department B2 in order to adjust the position of installation department B2 as far as possible, thereby promotes the straightness accuracy of brake and act as go-between 4 in rocking arm 2 rotation process.

The mounting part B2 is provided with a support sleeve mounting opening, and a support sleeve 7 is arranged in the support sleeve mounting opening. The brake cable 4 in the mounting portion B2 is disposed in the support sleeve 7. The deformation range of the brake pull wire 4 is limited in the support sleeve 7 by the support sleeve mounting opening so as to increase the straightness of the brake pull wire 4 in the mounting part B2.

The structure and the mounted position of the limiting portion are various, and the limiting portion is used for fixing the brake cable mounting piece 5 on the housing 1 along the direction perpendicular to the housing 1.

Preferably, the limiting part comprises a limiting plate B4 and a limiting opening B5. The limiting plate B4 and the limiting opening B5 are arranged on the stay wire rotating part B1.

The limiting plate B4 is located on a side surface of the housing 1, and the limiting plate B4 can be always extruded on an inner side surface or an outer side surface of the housing 1, or when the stay wire rotating portion B1 generates a trend of being separated from the housing 1, the limiting plate B4 is extruded on the inner side surface or the outer side surface of the housing 1, so that the limiting plate B4 cooperates with the inner side surface or the outer side surface of the housing 1 to face the stay wire rotating portion B1 to play a limiting role.

The limiting opening B5 is positioned outside the shell 1, a limiting piece is arranged on the limiting opening B5, and the stay wire rotating part B1 is limited on the shell 1 through the limiting piece.

Specifically, in this embodiment, the limiting plate B4 is located at the outer end of the rotating shaft, and the limiting opening B5 is located at the inner end of the rotating shaft. The limiting plate B4 limits the stay wire rotating part B1 in the second rotating hole B3 from outside to inside, and after the stay wire rotating part B1 is installed in the second rotating hole B3, a limiting piece is installed, and the limiting piece limits the stay wire rotating part B1 in the second rotating hole B3 from outside to inside. The double-end positioning of the stay wire rotating part B1 is achieved, so that the brake stay wire 4 in the mounting part B2 is not easy to bend in the direction perpendicular to the shell 1. Meanwhile, the limit opening B5 is matched with the limit plate B4, so that the process of installing the stay wire rotating part B1 into the second rotating hole B3 is not influenced.

In addition, the brake cable 4 between the free rotating end 22 and the mounting portion B2 is easy to be contaminated with silt due to exposure, and is brought into the supporting sleeve 7, so that the friction force of the brake cable 4 during moving in the supporting sleeve 7 is increased, and the risk of breaking the brake cable 4 is also increased. Therefore, in this embodiment, the dustproof member 6 is disposed between the free rotation end 22 and the mounting portion B2, and the brake cable 4 between the free rotation end 22 and the mounting portion B2 is disposed in the dustproof member 6, so that the risk of contamination of the brake cable 4 with silt is reduced, and the service life of the brake cable 4 is prolonged.

Preferably, the dust guard 6 is selected to be a corrugated sheath. The complete protection of the brake cable 4 between the free rotating end 22 and the mounting portion B2 is achieved by the corrugated sheath. Meanwhile, the space between the free rotating end 22 and the mounting part B2 can be changed, and the corrugated sheath with better elasticity can be also suitable for the working state without additional influence on the rotation of the rocker arm 2. In addition, the inner space of the corrugated sheath is larger, the brake pull wire 4 is thinner, and the movement of the brake pull wire 4 cannot be influenced.

A complete brake cable 4 is now mounted from the side of the mounting portion B2 remote from the rocker arm 2 via the mounting portion B2 to the free rotating end 22. The brake cable 4 is pulled from the side of the mounting portion B2 away from the rocker arm 2 in the arrow direction in fig. 5, and the rocker arm 2 is driven to rotate. The brake cable 4 between the opposite mounting portion B2 and the free rotating end 22 is disposed substantially along the connecting line direction of the mounting portion B2 and the free rotating end 22. At this time, an included angle is formed between the brake cable 4 between the mounting portion B2 and the free rotating end 22 and the brake cable 4 in the mounting portion B2, so that the whole brake cable 4 bends or tends to bend at the end of the mounting portion B2 close to the rocker arm 2. At this time, the deformation force generated by the brake stay 4 acts on the mounting part B2, so that the mounting part B2 rotates relative to the rocker arm 2, the brake stay 4 in the mounting part B2 correspondingly rotates, the brake stay 4 in the mounting part B2 and the brake stay 4 between the mounting part B2 and the lower end of the rocker arm 2 are positioned on the same straight line as much as possible, and compared with the non-rotatably mounted mounting part B2, the wear of the brake stay 4 at the position close to the end part of the rocker arm 2 of the mounting part B2 is reduced, the aging of the brake stay 4 is reduced, and the service life of the brake stay 4 is prolonged.

The third improvement scheme is as follows: a buffer C1 for buffering the collision of the vehicle frame against the bayonet sidewall 13 is provided in the bayonet 131.

It is generally believed in the art that the primary cause of the breaking of the bayonet sidewall 13 is due to the tangential forces from the carriage to which the ends are subjected. However, the present embodiment has been found by analysis that the main cause of the breaking of the bayonet side wall 13 is not due to the tangential force from the carriage at the end of the bayonet side wall 13, but due to the impact of the carriage on the intermediate position of the bayonet side wall 13 within the bayonet 131. The buffer C1 in this embodiment is therefore disposed in the gap between the bayonet sidewall 13 and the frame. The buffer C1 can fill the gap between the bayonet sidewall 13 and the carriage on the one hand, and can buffer the collision of the carriage on the bayonet sidewall 13 during vibration on the other hand.

Preferably, the buffer member C1 is made of a material which is wear-resistant, pressure-resistant and elastic. Meanwhile, in order to facilitate the installation of the buffer member C1, the buffer member C1 may be provided on the bayonet sidewall 13. For example, the buffer C1 is fixed to the bayonet sidewall 13 in the present embodiment.

As a specific structure of the bayonet sidewall 13, the bayonet sidewall 13 in this embodiment includes a first sidewall 132 and a second sidewall 133, where the first sidewall 132 and the second sidewall 133 are disposed opposite to each other. Preferably, the first sidewall 132 and the second sidewall 133 are disposed parallel to each other in the present embodiment, and are disposed along the up-down direction during operation. In this embodiment, the bayonet 131 is located between the first sidewall 132 and the second sidewall 133. The buffer C1 may be provided on the first sidewall 132 or the second sidewall 133. Generally, after the frame is installed between the first side wall 132 and the second side wall 133, the first side wall 132 and the second side wall 133 are impacted along opposite directions of the first side wall 132 and the second side wall 133 during traveling of the frame. In this embodiment, if the buffer member C1 is disposed on the first sidewall 132, the buffer member C1 buffers the impact of the vehicle frame from bottom to top, and if the buffer member C1 is disposed on the second sidewall 133, the buffer member C1 buffers the impact of the vehicle frame from top to bottom.

Preferably, the cushion member C1 of the present embodiment includes a first cushion member C2 and a second cushion member C3. The first buffer member C2 is disposed on the first sidewall 132, the second buffer member C3 is disposed on the second sidewall 133, and the first buffer member C2 and the second buffer member C3 are both disposed in the bayonet 131. The first cushion C2 protects the first side wall 132 in the up-down direction, and the second cushion C3 protects the second side wall 133 in the up-down direction. The frame vibrates from top to bottom along advancing the in-process, receives the cushioning effect of a bolster C2 and No. two bolster C3 simultaneously for the vibrations of frame form damping vibration, in order to play the guard action to No. one lateral wall 132 and No. two lateral walls 133.

The bayonet sidewall 13 in this embodiment further includes a third sidewall 134, where the third sidewall 134 is located between the first sidewall 132 and the second sidewall 133. The housing 1 is a substantially disc body, the third side wall 134 is substantially parallel or parallel to the outer side surface of the housing 1, and the third side wall 134 is integrally formed with the housing 1. The housing 1 is mounted parallel to the wheels. After the frame is mounted between the first side wall 132 and the second side wall 133, the inner side surface of the frame (i.e., the surface of the frame parallel or substantially parallel to the wheels) is parallel or substantially parallel to the third side wall 134, and a gap is left between the third side wall 134 and the frame.

Correspondingly, the buffer member C1 further comprises a third buffer member C4, the third buffer member C4 is arranged on the third side wall 134, and the third buffer member C4 fills a gap between the third side wall 134 and the frame. The third cushion C4 is used to cushion the impact of the frame against the third side wall 134. Because the frame mainly vibrates up and down, but not along the direction vertical to the shell 1, the third buffer piece C4 can play a role in assisting the protection of the shell 1.

Preferably, the first buffer member C2, the second buffer member C3 and the third buffer member C4 are rubber pads.

Further, the first cushion member C2, the second cushion member C3, and the third cushion member C4 are integrally formed. The rubber pad is easy to mold and convenient to install. Meanwhile, the buffer C4 is arranged, and the buffer C2 and the buffer C3 are more conveniently integrally formed.

In this embodiment, the buffer member C1 is adopted to make the connection mode between the bayonet sidewall 13 and the frame have the advantages of both moving fit and rigid connection.

In addition, a gap is left between the boss 121 and the bayonet sidewall 13. This structural design can be implemented independently of the structural design of the bumper C1 and bayonet sidewall 13 in this embodiment.

The clearance between the boss 121 and the bayonet sidewall 13 is such that the impact of the vibration of the carriage on the end of the bayonet sidewall 13 remote from the central bore 12 is reduced compared to the prior art.

The housing 1 is increased in volume due to the clearance created between the boss 121 and the bayonet sidewall 13 relative to the prior art. The reinforcement C5 is thus provided in this embodiment between the boss 121 and the bayonet sidewall 13 to enhance the strength of the housing 1. The stiffener C5 fills the gap between the boss 121 and the bayonet sidewall 13.

Preferably, the stiffener C5 in this embodiment is a stiffener, and the stiffener is integrally formed with the housing 1. The reinforcing ribs utilize the bayonet side wall 13 structure on the housing 1 in the prior art, and the production of the housing 1 in this embodiment can be realized by slightly modifying the mold for producing the existing housing 1.

The fourth improvement scheme is as follows: the rotary shaft 3 is driven to rotate by the rocker arm 2, and a rust removing groove D1 penetrating in the axial direction of the shaft hole is provided between the outer wall surface of the rotary shaft 3 and the inner wall surface of the shaft hole 11.

Preferably, the rotation shaft 3 in this embodiment includes a connection portion 31 and a rotation portion 32. In this embodiment, the fixed hinge end 21 is provided with a connecting hole 211, and the connecting portion 31 is inserted and fixed in the connecting hole 211, so that the rocker arm 2 and the connecting portion 31 are fixed to each other, and the rocker arm 2 drives the connecting portion 31 to rotate. The connecting part 31 and the rotating part 32 are fixed, so that the rotating part 32 is driven to rotate when the connecting part 31 rotates. The rotating portion 32 is rotatably mounted in the shaft hole 11. The fixing manner between the connecting portion 31 and the rotating portion 32 may be an integrally formed manner, an assembled manner, or the like, and in this embodiment, the connecting portion 31 and the rotating portion 32 are integrally formed.

The shape of the connection portion 31 is matched with the shape of the connection hole 211, and is, for example, rectangular parallelepiped. The connecting portion 31 is inserted and fixed in the connecting hole 211, at this time, since the connecting hole 211 is different from the circular design in the prior art, there is no problem of relative rotation between the rectangular connecting hole 211 and the rectangular connecting portion 31, and thus the connection mode between the connecting portion 31 and the connecting hole 211 can be simplified appropriately.

Wherein, part of the outer wall surface of the rotating part 32 is clamped on the inner wall surface of the shaft hole 11, so that the rotating part 32 can stably rotate in the shaft hole 11. The outer wall surface of the rotating portion 32 which is not bonded to the inner wall surface of the shaft hole 11 forms a rust removing groove D1 with the inner wall surface of the shaft hole 11, and the rust removing groove D1 penetrates in the axial direction of the shaft hole 11. Rust on the outer wall surface of the rotating portion 32 and the inner wall surface of the shaft hole 11 falls into the rust discharging groove D1, and is then discharged out of the shaft hole 11.

The shape, size and position of the rust discharging groove D1 may be set according to the shape and size of the regulation shaft hole 11 and the rotating portion 32 as required. However, it should be satisfied that the rotating portion 32 can rotate stably in the shaft hole 11, and that the rotating portion 32 does not shake or translate in the shaft hole 11.

As a specific matching relationship between the shaft hole 11 and the rotating portion 32, the shaft hole 11 is a circular hole in this embodiment, the shape of the rotating portion 32 is selected to be a rectangular prism, and the side edges of the rotating portion 32 are parallel to the central axis of the shaft hole 11. The bottom surface of the turning portion 32 in this embodiment is a fourteen-sided shape.

The side edges of the rotating portion 32 are located on the inner wall surface of the shaft hole 11 so that the rotating portion 32 can rotate within the shaft hole 11. Specifically, it is only necessary to ensure that at least three side edges of the rotating portion 32 are on the inner wall surface of the shaft hole 11, or that the side surface of the rotating portion 32 where two side edges are located is the central axis surface of the shaft hole 11, so that the rotating portion 32 can stably rotate in the shaft hole 11. In this embodiment, fourteen side edges of the rotating portion 32 are disposed on the inner wall surface of the shaft hole 11, so as to increase the holding force between the rotating portion 32 and the shaft hole 11 and prevent the side edges of the rotating portion 32 from slipping.

In this case, the side surfaces of the rotating portion 32 and the inner wall surface of the shaft hole 11 may serve as the rust removing groove D1. Meanwhile, during the rotation of the rotating part 32, the side edges of the rotating part 32 can also scrape the rust generated on the inner wall surface of the shaft hole 11 into the rust discharging groove D1, or the inner wall surface of the shaft hole 11 scrapes part of the rust on the outer wall surface of the rotating part 32 into the rust discharging groove D1.

Preferably, the shape of the rotation portion 32 is a straight prism other than a regular prism, that is, a non-regular prism. The bottom surface of the turning portion 32 in this embodiment is a non-regular fourteen-sided shape. The purpose is to make the stress of each side edge of the rotating part 32 in the shaft hole 11 uneven so as to enhance the friction force between a specific side edge and the shaft hole 11, so that the rotating part 32 is not easy to slip in the shaft hole 11, and meanwhile, the specific side edge can scrape rust into the rust discharging groove D1 with a larger force.

In addition, the rust discharging groove D1 can also be used as a space for storing lubricant, and lubricant is stored in the rust discharging groove D1. When the drum brake is used, the two ends of the shaft hole 11 are sealed, so that the lubricant cannot overflow. Both ends of the shaft hole 11 may be sealed by a sealing member.

The fifth improvement scheme is as follows: the outside of the rotating shaft 3 is provided with a guard portion for reducing the entry of silt or water into the shaft hole 11.

The rotary shaft 3 is rotatably mounted in the shaft hole 11 around its own axis so that the rocker arm 2 is rotatably connected with respect to the shaft hole 11. In order to achieve this connection, the portion of the rotating shaft 3 located outside the housing 1 is exposed to the air, which causes sediment and water to enter the shaft hole 11 along the rotating shaft 3, so that the shaft hole 11 is blocked by the sediment, or the rotating shaft 3 is rusted under the action of the water, which causes the rotation ability of the rocker arm 2 to be weakened, easily causes a safety accident, and causes the service life of the drum brake to be reduced.

In order to solve the above-mentioned problem, the present embodiment protects the rotating shaft 3 in a part direction outside the housing 1 by the protecting portion, and blocks in a part direction in which it is possible to splash sediment or water into the rotating shaft 3, so as to reduce the sediment or water from entering the shaft hole 11, thereby increasing the service lives of the shaft hole 11 and the rotating shaft 3. Meanwhile, in the use state of the drum brake, the main sources of sediment and water entering the shaft hole 11 through the rotating shaft 3 are located on the outer side of the shell 1 instead of the inner side of the shell 1, so that the protection part located on the outer side of the rotating shaft 3 can separate most of sediment and water, the protection effect of the protection part is ideal, and the practical requirement can be met.

The protection part in this embodiment includes a protection cover E1, and the protection cover E1 is located outside the rotation shaft 3. The part of the rotating shaft 3 outside the shell 1 is protected by the protecting cover E1, so that sediment and water cannot splash onto the rotating shaft 3. Considering that the outer end of the rotating shaft 3 is generally located in the connection hole 211, the present embodiment provides the protection cover E1 outside the outer end of the rotating shaft 3. The exposed part of the rotating shaft 3 is generally between the shaft hole 11 and the connecting hole 211, so that the protecting cover E1 blocks the sediment and the water from the outer side of the outer end of the rotating shaft 3 (the side of the outer end of the rotating shaft 3 away from the shell 1), and can effectively intercept the sediment and the water from multiple angles and multiple directions by matching the characteristics of large interception area and wide direction of the protecting cover E1. In addition, most of the sediment and water pass through the connection part of the rocker arm 2 and the rotating shaft 3, namely enter the shaft hole 11 through the outer end of the rotating shaft 3, so that the protective cover E1 can block on the main travelling path of the sediment and water so as to reduce the accumulation of the sediment and water in the shaft hole 11.

As the structural supplement of the protective cover E1, the protective part in this embodiment further includes a protective rib E2, and plays a protective role by matching the protective rib E2 with the protective cover E1 to intercept silt and water.

The protection convex rib E2 is arranged on the outer side face of the shell 1, and the protection convex rib E2 can play a role in reducing sediment or water from entering the shaft hole 11. The shape, size, material and other parameters of the protection rib E2 can be selected according to practical requirements, but the protection rib E2 should not hinder the swing arm 2 from rotating. In the opposite direction of the protection rib E2 and the shaft hole 11, the protection rib E2 protects the shaft hole 11, or in the opposite direction of the protection rib E2 and the part of the rotating shaft 3 located outside the housing 1, the protection rib E2 protects the rotating shaft 3.

The protection rib E2 can also enhance the strength of the housing 1. In order to maximize the strength enhancement effect of the protection convex rib E2, and the connection strength and the sealing effect of the protection convex rib E2 and the outer side surface of the shell 1 are best, the protection convex rib E2 and the shell 1 are fixed by adopting integrated forming.

Furthermore, in this embodiment, the bottom edge of the protection rib E2 is completely disposed on the outer side surface of the housing 1, so that the strength enhancement effect of the protection rib E2 on the housing 1 is maximized, and meanwhile, no gap is left between the side edge of the protection rib E2 and the outer side surface of the housing 1 due to the integrated protection rib E2 and the housing 1. In the drum brake use state, all or a part of the protection convex rib E2 is positioned above the shaft hole 11, so that sediment and water cannot flow to the shaft hole 11 and the rotating shaft 3 from top to bottom from the outer side surface of the shell 1 under the action of gravity, and are far away from the shaft hole 11 and the rotating shaft 3 along the protection convex rib E2.

In addition, the protective cover E1 is connected with the protective convex rib E2, so that the protective convex rib E2 plays a role of an installation table, and the protective cover E1 is installed on the shell 1 through the protective convex rib E2. At this time, the protection cover E1 and the protection convex rib E2 form a common protection surface, so that the part of the rotating shaft 3 exposed out of the shell 1 can be protected, and sediment and water are effectively prevented from being sputtered onto the rotating shaft 3.

In order to further improve the protection effect of the protection cover E1 and the protection rib E2, in this embodiment, a protection groove E3 is formed in a space between the protection rib E2 and the protection cover E1, and a portion of the shaft hole 11 and the rotation shaft 3 located outside the housing 1 is disposed in the protection groove E3. At this time, the protection ribs E2 and the protection cover E1 can protect the shaft hole 11 and the exposed part of the rotating shaft 3 within a larger limit range and block silt and water, so that the utilization rate of the protection ribs E2 and the protection cover E1 reaches a higher level.

The edge of the protection cover E1 is attached to the side surface of the boss 121. The boss 121 is utilized to support the installation of the protective cover E1, meanwhile, the protective cover E1 is matched with the boss 121 together to form a travel route blocking for sediment and water, and at the moment, the side face of the boss 121 forms one side wall of the protective groove E3. In addition, the side surface of the boss 121 can reduce the volume of the protective cover E1, and the boss 121 can also play a certain role in positioning the installation of the protective cover E1.

Preferably, the protection rib E2 in this embodiment includes a straight line segment E4 and a curved line segment E5, the curved line segment E5 is located at the left side of the straight line segment E4, and the left end of the straight line segment E4 is connected to the upper end of the curved line segment E5. The straight line segment E4 is disposed above the shaft hole 11, the curved line segment E5 is disposed substantially along the circumferential direction of the shaft hole 11, the shaft hole 11 is located at the left side of the boss 121, and both the straight line segment E4 and the curved line segment E5 are perpendicular to the outer side surface of the housing 1. The right end of the straight line segment E4 is attached to the side surface of the boss 121. At this time, the straight line segment E4, the curved line segment E5, the boss 121, and the outer side surface of the housing 1 form a structure for protecting along the circumferential direction of the shaft hole 11 and the circumferential direction of the rotating shaft 3. Through the structure, the boss 121 in the prior art is fully utilized for the second time, and meanwhile, the length requirement of the protection convex rib E2 is reduced by utilizing the boss 121, and the production cost required by the protection convex rib E2 is reduced.

Based on the fact that the shape of the casing 1 is approximately a disc, and most of sediment and water are splashed to the outer surface of the casing 1 from the outer side of the casing 1, the protecting cover E1 can be in various forms such as an arc cover, a flat plate cover and the like, so that the protecting cover E1 is arranged towards the casing 1, that is, the installing direction of the protecting cover E1 is that the outer side of the casing 1 points to the inner side of the casing 1.

For example, in this embodiment, the protecting cover E1 is selected as a flat cover, the protecting cover E1 is disposed parallel to the housing 1, and the edge of the protecting cover E1 is mounted on the side of the protecting rib E2 away from the housing 1 and the side of the boss 121. The protection cover E1 is a main protection piece, and blocks most of silt and water along the normal direction of the housing 1, the protection ribs E2 and the boss 121 block a small amount, and the use loss of the protection cover E1 is strongest, and the loss of the protection ribs E2 is smaller. Therefore, the service life of the drum brake can be prolonged by replacing the protective cover E1. The protecting cover E1 is mounted on the protecting rib E2 by using a mounting method such as screws, buckles, etc. that is convenient to detach, so that the protecting cover E1 is detachably mounted with respect to the protecting rib E2. The protection convex rib E2 and the shell 1 are fixed in an integrated forming mode, so that the disassembly type installation of the protection cover E1 is facilitated, and the production of the shell 1 is facilitated.

A rocker arm movable opening E6 is arranged between the protective cover E1 and the outer side surface of the shell 1, and the rocker arm movable opening E6 provides a space for rotating the rocker arm 2. The rocker arm movable opening E6 enables the arrangement of the protective cover E1 not to influence the rotation of the rocker arm 2, and further normal work of the drum brake is not influenced.

In addition, since the straight line segment E4 is located above the shaft hole 11 in the present embodiment, the corresponding rocker arm moving port E6 is located below the shaft hole 11. Under the working state, sediment and water are difficult to splash to the rotating shaft 3 from the rocker arm movable opening E6 positioned below the shaft hole 11 under the action of gravity, so that the rocker arm movable opening E6 cannot have excessive influence on the protection action of the protection convex rib E2.

In this embodiment, the shape and size of the curved section E5 are further adjusted, so that the edge of the lower end of the curved section E5 is a limiting wall E7, and the limiting wall E7 can limit the rocker arm 2, so as to prevent the rocker arm 2 from over-rotating. When the rocker arm 2 excessively rotates clockwise, the protection convex rib E2 clamps the rocker arm 2 by using the limiting wall E7.

The sixth improvement scheme is: the inner wall of the center hole 12 is provided with a spacer F1, the outer wall of the spacer F1 is arranged on the inner wall of the center hole 12, and the spacer F1 is provided with a connecting shaft hole for installing a connecting shaft, so that the later-stage connecting shaft is prevented from rusting to cause difficult disassembly from the center hole 12. The side wall of the connecting shaft hole is the inner wall of the isolation sleeve F1.

Because the shape of the isolation sleeve F1 and the shape of the central hole 12 are both cylindrical, and the diameter of the outer wall of the isolation sleeve F1 is equal to or slightly larger than the diameter of the inner wall of the central hole 12, the outer wall of the isolation sleeve F1 is attached to the inner wall of the central hole 12, and then the connecting shaft is installed in the middle of the isolation sleeve F1, so that the isolation sleeve F1 can isolate the inner wall of the central hole 12 from the outer wall of the connecting shaft.

At present, the materials of the shell 1 and the connecting shaft are relatively fixed, and rust is easy to generate in the using process. In contrast, the isolation sleeve F1 is independent of the shell 1 and the connecting shaft, so that the isolation sleeve F1 is free in material selection and easy in shape design, and is easy to replace. The isolation sleeve F1 is made of a material which is not easy to rust, and the inner wall (high resistance surface) of the central hole 12 contacted with the connecting shaft is replaced by the inner wall (low resistance surface) of the isolation sleeve F1, so that the dismounting difficulty of the connecting shaft after rust can be greatly reduced.

In order to further reduce the dismounting resistance of the spacer F1 to the connecting shaft, in this embodiment, the inner wall of the spacer F1 and even the whole is further surface-treated, so that the spacer F1 is more difficult to rust. Since the connecting shaft and the housing 1 are large in volume, it is difficult to perform the surface treatment of the center hole 12 and the middle small section of the connecting shaft in a fine small range, so that if the surface treatment is performed on the connecting shaft and the housing 1, the overall treatment is often required, the cost and the material consumption are huge, and the waste of the material is generated in many positions where the surface treatment is not required. In contrast, the spacer F1 requires less material and cost for surface treatment, and saves cost. Meanwhile, the inner wall of the isolation sleeve F1 is attached to the outer wall of the connecting shaft, and the outer wall of the isolation sleeve F1 is attached to the inner wall of the central hole 12, so that the overall surface treatment cost performance of the isolation sleeve F1 is high.

Preferably, an oil storage member F2 is disposed inside the inner wall of the isolation sleeve F1 in this embodiment, and an oil storage port F3 is formed in the oil storage member F2. The connecting shaft is arranged in the oil storage part F2, and the oil storage port F3 is matched with the inner wall of the isolation sleeve F1 to store the lubricant, so that the lubricant is guided to lubricate the connecting shaft, and the connecting shaft is convenient to detach.

Preferably, the oil storage part F2 of the present embodiment includes an oil storage sleeve F4 and a second limiting part F5 disposed on the oil storage sleeve F4. The outer wall laminating of oil storage cover F4 is on the inner wall of isolation cover F1, and oil storage cover F4 is located the shaft hole. The oil storage port F3 is arranged on the oil storage sleeve F4, meanwhile, the oil storage port F3 penetrates through the inner wall and the outer wall of the oil storage sleeve F4, and the outer wall of the connecting shaft is attached to the inner wall of the oil storage sleeve F4. The second limiting part F5 is positioned on the outer side surface of the shell 1 and prevents the oil storage sleeve F4 from being separated from the central hole 12.

In addition, no. two locating parts F5 set up in the tip of oil storage cover F4, and the tip and the No. two locating parts F5 cooperation of spacer F1 prevent that spacer F1 breaks away from centre bore 12.

Preferably, in this embodiment, the second limiting member F5 is a limiting ring, the limiting ring is attached to the outer surface of the housing 1, and the end portion of the spacer sleeve F1 is extruded on the limiting ring.

The six solutions in this embodiment are independent of each other, and do not affect each other, and a person skilled in the art may select one or more solutions from the six solutions according to actual needs to implement the method.

Example 2.

See fig. 12-14.

The difference between the drum brake mechanism disclosed in this embodiment and the drum brake mechanism disclosed in embodiment 1 is that this embodiment discloses a seventh improvement, and similarly, the seventh improvement and the sixth improvement in embodiment 1 are independent of each other, and can be implemented independently or by any combination.

The shell 1 is rotatably provided with a first brake shoe G1 and a second brake shoe G2, a first reset piece is arranged between one end of the first brake shoe G1 and one end of the second brake shoe G2, the first reset piece comprises an annular spring rod G3 with an opening, the annular spring rod G3 comprises a first fixed end G4 and a second fixed end G5, an opening is formed between the first fixed end G4 and the second fixed end G5, the first fixed end G4 is connected with the first brake shoe G1, and the second fixed end G5 is connected with the second brake shoe G2.

In this embodiment, one end of the annular spring rod G3 is connected with the first brake shoe G1, and the other end is connected with the second brake shoe G2, when resetting, the deformation resetting function of the annular spring rod G3 is utilized to reset, and long-term test and use processes show that the fracture resistance of the annular spring rod G3 is far greater than that of the tension spring, so that the annular spring rod G3 is not easy to fracture when long-term use, and the probability of falling into the shell 1 after the resetting piece fracture is reduced, so that the resetting capability of the brake shoe in the drum brake mechanism is more reliable, and meanwhile, the safety of the drum brake mechanism is enhanced.

The specific structure is as follows:

in this embodiment, the annular spring rod G3 is substantially circular and has an opening, the annular spring rod G3 forms two bending sections at the opening, namely a first bending section and a second bending section, the first bending section forms a first fixed end G4, the second bending section forms a second fixed end G5, the first brake shoe G1 is provided with a first insertion hole G6 into which the first bending section is inserted, the second brake shoe G2 is provided with a second insertion hole G7 into which the second bending section is inserted, and the characteristics of the first insertion hole G6 and the second insertion hole G7 can also be used to connect the two ends of the tension spring, so that compared with the conventional brake shoe, the structure of this part does not need to be improved, and the improvement cost is reduced.

In this embodiment, the outer shape of the annular spring rod G3 is substantially similar to the inner ring wall formed by the first brake shoe G1 and the second brake shoe G2, and in order to enhance the positioning effect on the annular spring rod G3, the first brake shoe G1 and/or the second brake shoe G2 are provided with a limiting groove G8 for axially limiting the annular spring rod G3, and it should be noted that, in the radial direction and the axial direction, both refer to the central hole 12 of the housing 1. In this embodiment, the first brake shoe G1 and the second brake shoe G2 are preferably provided with the limiting groove G8, and in other embodiments, only one of the limiting grooves G8 may be provided, which also falls within the scope of the present invention.

After the limiting groove G8 is formed in the embodiment, the annular spring rod G3 can be prevented from moving along the axial direction, so that the first fixing end G4 and the second fixing end G5 are separated from the corresponding first inserting hole G6 and second inserting hole G7, meanwhile, the limiting groove G8 has the effect that the relative positions between the annular spring rod G3 and the first brake shoe G1 and the second brake shoe G2 are relatively fixed, and the deformation space quantity of each time is relatively fixed, so that the restoring force of the annular spring rod G3 is relatively uniform.

For the limit groove G8, taking the first brake shoe G1 as an example, the first brake shoe G1 comprises a brake shoe body G10 and a limit plate G9 arranged on the brake shoe body G10, the limit groove G8 is formed between the limit plate G9 and the brake shoe body G10, and the limit plate G9 is independently arranged for installation, so that the limit groove G8 is formed on the basis of not changing the axial thickness of the original brake shoe body G10 as much as possible, and the modification cost is smaller. In other embodiments, the limiting groove G8 may be integrally formed directly on the brake shoe body G10.

The limiting piece G9 comprises a U-shaped part G11 and limiting flanks G12 extending from the U-shaped part G11 to two sides, the U-shaped part G11 is arranged on the brake shoe body G10 through a fastening piece G14, and limiting grooves G8 are formed between the limiting flanks G12 and the brake shoe body G10. The limiting piece G9 is designed into the structure, so that the brake shoe is convenient to install with the brake shoe body G10, and meanwhile limiting flanks G12 on two sides can realize limiting.

In addition, for light weight design, the brake shoe body G10 radially extends toward the center with an inner protrusion G13, and the inner protrusion G13 and the limiting piece G9 form a limiting groove G8. After the inner bulge G13 is designed, the radial thickness of the original brake shoe body G10 is not increased as much as possible, and only the radial thickness of the position below the limiting piece G9 is increased, so that the improvement cost is reduced, and the weight reduction of the brake shoe body G10 is ensured.

In this embodiment, the limiting groove G8 on the second brake shoe G2 and the first brake shoe G1 are symmetrically disposed, and will not be described again.

In order to increase the return capability between the first brake shoe G1 and the second brake shoe G2, a second return member G15 is provided between the other end of the first brake shoe G1 and the other end of the second brake shoe G2 in this embodiment.

In this embodiment, one end of the first brake shoe G1 and the second brake shoe G2 only rotate, but do not displace in the radial direction, the other end of the first brake shoe G1 and the other end of the second brake shoe G2 can freely rotate, referring to fig. 13, the right side ends of the first brake shoe G1 and the second brake shoe G2 only rotate, and the left side ends can freely rotate, while in this embodiment, preferably, the annular spring rod G3 is connected between the two left side ends, so that the left side ends are radially displaced, and therefore, the elastic deformation amount between the two left side ends is larger, and therefore, it is suitable to provide a first reset member with better fracture resistance between the two left side ends. In other embodiments, the annular spring rod G3 may be connected to a position near the right end, and such embodiments fall within the scope of the present invention.

Example 3.

The difference between this embodiment and embodiment 1 is that in this embodiment, the casing is not provided with a rotating member, the casing is provided with a mounting column, the mounting column and the casing are relatively fixed, and may be fixedly connected or may be an integral structure, the mounting column is provided with a first hanging position, one end of the tension spring is provided with a first hook, the first hook is hung in the first hanging position, and the first hanging position may be a hanging hole or a hanging slot.

Because the connection mode of the hanging connection is not completely rigid connection, the relative rotation between the tension spring and the shell in the embodiment is realized by the rotation of the first hanging hook in the hanging hole.

Example 4.

The difference between this embodiment and embodiment 1 is that the first, second and third cushioning members are springs.

Example 5.

The difference between this embodiment and embodiment 1 is that the shaft hole is a circular hole, the shape of the rotating portion is selected to be a straight prism, and the side edges of the rotating portion are parallel to the central axis of the shaft hole. The bottom surface of the rotating part is triangular in this embodiment.

The side edges of the rotating part are positioned on the inner wall surface of the shaft hole, so that the rotating part can rotate in the shaft hole. Specifically, as long as three side edges of the rotating part are all on the inner wall surface of the shaft hole, or one side surface of the rotating part is the middle shaft surface of the shaft hole, the condition that the rotating part can stably rotate in the shaft hole can be met. In this embodiment, two side edges of the rotating portion are disposed on an inner wall surface of the shaft hole, and a side surface of the rotating portion where the two side edges are located is a middle shaft surface of the shaft hole. At this time, the rotating part can stably rotate in the shaft hole.

The outer wall surface of the rotating part and the inner wall surface of the shaft hole can be used as a rust discharging groove. Meanwhile, in the rotation process of the rotating part, the side edges of the rotating part on the inner wall surface of the shaft hole can also scrape rust generated on the inner wall surface of the shaft hole into the rust discharging groove. Meanwhile, the contact surface between the rotating part and the shaft hole is relatively smaller, so that the space of the rust discharging groove is larger.

In order to facilitate the rust discharging of the rust discharging groove, the side wall of the rust discharging groove is provided with a rust discharging thread which is used for assisting the discharge of the rust in the rust discharging groove. The rust removing thread should not affect the relative rotation between the shaft hole and the rotating part.

Specifically, in this embodiment, the rust removing thread is disposed on the side wall of the shaft surface in the shaft hole at the rotating portion.

Example 6.

The difference between this embodiment and embodiment 1 is that in this embodiment, the shaft hole is a straight-edged hole, the shape of the rotating portion is selected to be cylindrical, and the side edges of the shaft hole are parallel to the central axis of the rotating portion. In this embodiment, the bottom surface of the shaft hole is fourteen-sided.

The outer wall surface of the rotating part is tangential to the inner wall surface of the shaft hole, so that the rotating part can rotate in the shaft hole.

Preferably, in this embodiment, the shaft hole is in a regular fourteen prism shape, and the outer wall surface of the rotating portion is tangent to all the inner wall surfaces of the shaft hole, so that the rotating portion and the shaft hole can maintain high friction force under the condition of a small contact surface, and slipping during rotation of the rotating portion is prevented.

The outer wall surface of the rotating part and the inner wall surface of the shaft hole can be used as a rust discharging groove. In the rotating process of the rotating part, the outer wall surface of the rotating part can scrape rust generated on the inner wall surface of the shaft hole into the rust discharging groove, and rust is discharged through the rust discharging groove.

Specifically, in this embodiment, the rust removing thread is disposed on the apex of the shaft hole.

Example 7.

The difference between this embodiment and embodiment 1 is that the shaft hole is a circular hole, and the shape of the rotating portion is a curved cylinder. The curved column is a column with a bottom surface shaped to include a curve, and a side wall or side edge of the curved column is perpendicular to the bottom surface. For example, a cylinder is a special curved cylinder.

The side wall surface of the curved surface column body comprises an arc surface and a plane.

The arc surface is matched with the inner wall surface of the shaft hole, such as tangent or coincident. Preferably, the arc surface is attached to the inner wall surface of the shaft hole, so that the rotating part can be attached to the shaft hole more tightly, and the rotating part can rotate in the shaft hole stably.

The space between the plane and the inner wall surface of the shaft hole can be used as a rust discharging groove. Meanwhile, in the rotating process of the rotating part, the arc surface can also scrape rust generated on the inner wall surface of the shaft hole into the rust discharging groove.

Example 8.

The side wall surface of the curved surface cylinder comprises an arc surface and a tooth surface.

The tooth surface and the inner wall surface of the shaft hole can be used as a rust removing groove. Meanwhile, in the rotating process of the rotating part, the arc surface can also scrape rust generated on the inner wall surface of the shaft hole into the rust discharging groove. The tooth surface can be designed to be spiral along the axial direction of the shaft hole, which is beneficial to the discharge of rust.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that the present invention includes but is not limited to the accompanying drawings and the description of the above specific embodiment. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.

Claims

1. The utility model provides a drum mechanism of stopping, includes the shell, rotates on the shell and installs the rocking arm that is used for connecting the brake to act as go-between, its characterized in that: the rocker arm comprises a fixed hinge end and a free rotating end, the fixed hinge end is rotatably mounted on the shell, the drum brake mechanism further comprises a tension spring which generates restoring force for the rocker arm, one end of the tension spring is rotatably connected with the shell, the other end of the tension spring is connected with the free rotating end, the tension spring correspondingly rotates relative to the shell while the rocker arm rotates, a brake cable mounting piece for mounting a brake cable is rotatably mounted on the shell, a first rotating hole is formed in the shell, a rotating piece is rotatably mounted in the first rotating hole, the tension spring is connected to the rotating piece, and the rotating piece and the brake cable mounting piece are respectively positioned on two sides of the rocker arm; when the rocker arm is pulled by the brake pull wire and rotates, the tension spring can rotate along with the rocker arm, the angle of the tension spring is also changed, and the total resilience force of the tension spring is not greatly changed when being shared to the pulling direction in the pulling direction of the brake pull wire;

The shell is rotatably provided with a first brake shoe and a second brake shoe, a first reset piece is arranged between one end of the first brake shoe and one end of the second brake shoe, the first reset piece comprises an annular spring rod with an opening, the annular spring rod comprises a first fixed end and a second fixed end, the opening is formed between the first fixed end and the second fixed end, the first fixed end is connected with the first brake shoe, and the second fixed end is connected with the second brake shoe; the annular spring rod is approximately circular and is provided with an opening, the annular spring rod forms two bending sections at the opening position, namely a first bending section and a second bending section, the first bending section forms a first fixed end, the second bending section forms a second fixed end, a first insertion hole for the first bending section to be inserted is formed in the first brake shoe, a second insertion hole for the second bending section to be inserted is formed in the second brake shoe, a limiting groove for axially limiting the annular spring rod is formed in the first brake shoe and/or the second brake shoe, the first brake shoe comprises a brake shoe body and a limiting piece mounted on the brake shoe body, a limiting groove is formed between the limiting piece and the brake shoe body, a second reset piece is arranged between the other end of the first brake shoe and the other end of the second brake shoe, the limiting piece comprises a U-shaped part and limiting flanks extending from the U-shaped part to two sides, the U-shaped part is mounted on the brake shoe body through a fastener, and the limiting groove is formed between the limiting flanks and the brake shoe body.

2. The drum brake mechanism of claim 1, wherein: the fixed hinge end is connected with a rotating shaft, the shell is provided with a shaft hole, the rotating shaft is rotatably arranged in the shaft hole, and the outer side of the rotating shaft is provided with a protection part for reducing sediment or water from entering the shaft hole.

3. The drum brake mechanism of claim 1, wherein: the fixed hinge end is connected with a rotating shaft, the shell is provided with a shaft hole, the rotating shaft is rotatably arranged in the shaft hole and driven by the rocker arm to rotate, and a rust discharging groove which axially penetrates along the shaft hole is arranged between the outer wall surface of the rotating shaft and the inner wall surface of the shaft hole.

4. The drum brake mechanism of claim 1, wherein: the shell is provided with a bayonet side wall, the bayonet side wall is enclosed to form a bayonet for installing the frame, and a buffer part for buffering the collision of the frame to the bayonet side wall is arranged in the bayonet.

5. The drum brake mechanism of claim 1, wherein: the middle of the shell is provided with a central hole, the inner wall of the central hole is provided with a spacer sleeve, and the spacer sleeve is provided with a connecting shaft hole for installing a connecting shaft.

6. The drum brake mechanism of claim 1, wherein: the rotating piece comprises a rotating column, the rotating column is arranged in a first rotating hole, the rotating piece further comprises an adjusting part which is movably connected to the rotating column and used for adjusting the initial length of a tension spring, and the tension spring is connected with the adjusting part.

7. The drum brake mechanism of claim 2, wherein: the protection part comprises a protection cover and a protection convex rib, the protection cover is located on the outer side of the rotating shaft, the protection convex rib is installed on the outer side face of the shell, the protection cover is connected with the protection convex rib, and the protection cover is installed on the shell through the protection convex rib.

8. The drum brake mechanism of claim 7, wherein: and a rocker arm movable opening is arranged between the protective cover and the outer side surface of the shell and used for allowing the rocker arm to rotate, and the rocker arm movable opening is positioned below the shaft hole.