CN116753252A - Automobile drum brake, braking method and automobile - Google Patents

Automobile drum brake, braking method and automobile Download PDF

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Publication number
CN116753252A
CN116753252A CN202311007462.1A CN202311007462A CN116753252A CN 116753252 A CN116753252 A CN 116753252A CN 202311007462 A CN202311007462 A CN 202311007462A CN 116753252 A CN116753252 A CN 116753252A
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CN
China
Prior art keywords
brake
shoe
cavity
drum
cam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202311007462.1A
Other languages
Chinese (zh)
Other versions
CN116753252B (en
Inventor
张敏
韩文辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhangjiagang Aachen Machinery Co ltd
Original Assignee
Zhangjiagang Aachen Machinery Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhangjiagang Aachen Machinery Co ltd filed Critical Zhangjiagang Aachen Machinery Co ltd
Priority to CN202311007462.1A priority Critical patent/CN116753252B/en
Publication of CN116753252A publication Critical patent/CN116753252A/en
Application granted granted Critical
Publication of CN116753252B publication Critical patent/CN116753252B/en
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/16—Brakes with two brake-blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/10—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as exclusively radially-movable brake-shoes
    • F16D51/14—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as exclusively radially-movable brake-shoes fluid actuated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/02—Fluid-pressure mechanisms
    • F16D2125/16—Devices for bleeding or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2125/00—Components of actuators
    • F16D2125/18—Mechanical mechanisms
    • F16D2125/20—Mechanical mechanisms converting rotation to linear movement or vice versa
    • F16D2125/22—Mechanical mechanisms converting rotation to linear movement or vice versa acting transversely to the axis of rotation
    • F16D2125/28—Cams; Levers with cams

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention discloses an automobile drum brake, a braking method and an automobile, and relates to the technical field of brake drums. A rotator is arranged between the outer shoe and the inner shoe, and the rotator drives the outer cam and the inner cam to rotate so as to push the outer shoe and the inner shoe to block the brake drum from rotating and brake. The rotator moves in a rotating mode, external impurities are not easy to invade the rotator, and the braking effect can be guaranteed. In addition, the rotator is internally provided with an arc-shaped hydraulic cavity and a cavity, the hydraulic cavity is filled with hydraulic oil to push the wheel plug to slide towards the cavity, the outer cam and the inner cam can be driven to rotate together, the hydraulic cavity is separated from the cavity, the wheel plug is contacted with the bottom of the cavity, the heads of the outer cam and the inner cam are propped against the outer shoe and the inner shoe, that is, the outer shoe and the inner shoe wear to the limit at the moment, the wheel plug is blocked through the bottom of the cavity, the outer cam and the inner cam can be prevented from continuing to rotate, and the braking effect is prevented from being lost.

Description

Automobile drum brake, braking method and automobile
Technical Field
The invention relates to the technical field of brake drums, in particular to an automobile drum brake.
Background
Automotive drum brakes are braking force components used to create a force that resists movement or movement tendencies of an automobile. The automobile drum brake includes: a brake drum which is cylindrical and is fixed to a drive shaft of an automobile and rotates together with a hub; and a brake member fixed to a non-rotating portion of the vehicle and having at least a brake shoe disposed therein, the brake shoe being concentrically disposed in the brake drum so as not to contact the brake drum, the brake shoe being controlled by the brake cylinder.
When a driver presses a brake pedal, the brake works, the brake pedal drives the hydraulic pump to charge hydraulic oil into the brake cylinder, the telescopic end of the brake cylinder stretches out to push the brake shoe to be in contact with the brake drum, friction force is generated between the brake drum and the brake shoe, and the brake drum and the wheel hub stop rotating to block the movement of the automobile.
The automobile running road condition and the environment are complex, objects such as wind sand and rainwater often invade the brake drum, and the brake cylinder in the brake drum is controlled by a telescopic mode, so that impurities such as rainwater and dust sand are extremely easy to adhere to the telescopic end of the brake cylinder, the impurities can be brought into the brake cylinder in the frequent telescopic process, hydraulic oil in the brake cylinder is mixed with the impurities (when the existing treatment mode is that the automobile is maintained or the braking effect is found to be reduced, a brake is replaced), and even the sealing between the brake cylinder and the telescopic end of the brake cylinder is damaged, so that the oil leakage of the brake cylinder is caused, and the braking effect is influenced.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, due to the adoption of a structure of a brake shoe controlled by expansion and contraction of a brake cylinder, impurities such as rainwater, dust and sand are easy to invade the brake cylinder, so that the braking effect of an automobile is reduced.
The second object of the present invention is to provide a braking method.
The invention further provides an automobile.
In order to achieve one of the above purposes, the present invention adopts the following technical scheme: the automobile drum brake comprises a transmission shaft, a brake drum and a brake member, wherein the brake drum and the brake member are concentrically arranged on the transmission shaft, the brake drum is fixed with the transmission shaft, and the brake member is connected with the transmission shaft through a bearing.
The brake drum is fixedly connected with a brake cylinder, and a brake cavity is formed between the brake cylinder and the brake drum.
The brake component is provided with an outer chute and an inner chute, the brake component comprises an outer shoe and an inner shoe, the outer shoe is in sliding connection with the outer chute, the inner shoe is in sliding connection with the inner chute, the outer shoe and the inner shoe are concentrically arranged in the brake cavity, and the outer shoe and the inner shoe are not in contact with the wall surface of the brake cavity.
An extension spring is arranged between the outer shoe and the inner shoe.
The outer shoe comprises a brake member, wherein a rotor is arranged between the outer shoe and the inner shoe, the rotor is fixed on the brake member, the rotating end of the rotor is connected with an outer cam and an inner cam, the outer cam abuts against the outer shoe, the inner cam abuts against the inner shoe, and the outer cam and the inner cam are driven to rotate through the rotor so as to push the outer shoe to contact the brake drum and push the inner shoe to contact the brake drum.
Further, in an embodiment of the present invention, the brake drum and the brake cylinder are integrally connected, and the brake drum and the brake cylinder are concentric cylinder shapes.
Further, in the embodiment of the invention, a connecting disc is arranged at the front end of the transmission shaft, connecting holes are distributed on the connecting disc, a joint hole is arranged in a shaft hole in the brake cylinder, the transmission shaft and the connecting disc are arranged in the shaft hole, the connecting holes are aligned with the joint hole, and the connecting holes are connected with the joint hole through screw threads of bolts.
Further, in the embodiment of the invention, an outer magnetic ring is embedded at the outer bottom edge of the braking cavity, an inner magnetic ring is embedded at the inner bottom edge of the braking cavity, a first magnet sheet is arranged at the end surface of the outer shoe sheet opposite to the bottom of the braking cavity, a second magnet sheet is arranged at the end surface of the inner shoe sheet opposite to the bottom of the braking cavity, the first magnet sheet is staggered with the outer magnetic ring, and the second magnet sheet is staggered with the inner magnetic ring.
When the outer shoe is pushed to be in contact with the brake drum, the first magnet piece and the outer magnetic ring are staggered to be converted into corresponding parts, and the first magnet piece and the outer magnetic ring are attracted mutually.
When the inner shoe is pushed to be in contact with the brake cylinder, the second magnet piece and the inner magnetic ring are staggered from each other to be converted into corresponding, and the second magnet piece and the inner magnetic ring are attracted to each other.
The outer magnetic ring and the inner magnetic ring are attracted by non-rotational force to block the rotational movement of the brake drum, so that the braking effect is enhanced. Moreover, the reinforced braking effect can not increase the friction force between the outer shoe and the inner shoe, and can reduce the problems of abrasion and friction overheating.
Further, in the embodiment of the invention, the upper end and the lower end of the outer shoe are provided with external connection plates extending towards the inner shoe, the upper end and the lower end of the inner shoe are provided with internal connection plates extending towards the outer shoe, one end of the extension spring is fixed on the outer connection plate, and the other end of the extension spring is fixed on the internal connection plate.
The upper end and the lower end of the outer shoe plate extend out of the outer connecting plate, the upper end and the lower end of the inner shoe plate extend out of the inner connecting plate, connection of extension springs is facilitated, and the extension springs are distributed at the upper end and the lower end of the outer shoe plate and the upper end and the lower end of the inner shoe plate, so that stability of the outer shoe plate and the inner shoe plate during braking can be better, the heights of the outer shoe plate and the inner shoe plate can be higher, the contact area between the outer shoe plate and the brake drum and the brake cylinder is larger, and the braking effect is better.
Still further, in an embodiment of the present invention, a plurality of retainers are fixedly connected to the brake member, the retainers are connected to each other by a first ring and a second ring, the first ring and the second ring pass through a gap between the outer shoe and the inner shoe, and the rotator is clamped between the first ring and the second ring for fixation.
When the upper end and the lower end of the outer shoe extend out of the outer connecting plate, the upper end and the lower end of the inner shoe extend out of the inner connecting plate, the upper direction and the lower direction of the outer shoe and the inner shoe are not beneficial to fixing the rotator, the fixator is arranged outside the outer shoe and the inner shoe, and the first circular ring and the second circular ring of the fixator can pass through a side gap between the outer shoe and the inner shoe, so that the rotator is beneficial to fixing.
Further, in the embodiment of the present invention, an arc-shaped pressure chamber is provided in the rotator, the pressure chamber has a rotating wheel, the rotating wheel is a rotating end of the rotator, and the rotating wheel connects the outer cam and the inner cam.
The pressure cavity is also internally provided with a wheel plug connected with the rotating wheel, the wheel plug divides the pressure cavity into a hydraulic cavity and a cavity, the hydraulic cavity is separated from the cavity, and the wheel plug slides along the hydraulic cavity or the cavity so as to drive the rotating wheel to rotate.
The rotator is provided with an oil inlet nozzle, and the oil inlet nozzle is communicated with the hydraulic cavity.
The beneficial effects of the invention are as follows:
the invention is provided with a rotator between the outer shoe and the inner shoe, and the rotator drives the outer cam and the inner cam to rotate so as to push the outer shoe to contact the brake drum and push the inner shoe to contact the brake cylinder, thereby preventing the brake drum from rotating and braking. The rotator moves in a rotating mode, foreign matters such as external rainwater, dust and sand and the like are not easy to invade the rotator, and the automobile braking effect can be guaranteed.
And the hydraulic cavity and the cavity in the rotator are arc-shaped structures, and hydraulic oil is filled in the hydraulic cavity to push the wheel plug to perform arc-shaped sliding to the cavity, so that the rotating wheel, the outer cam and the inner cam can be driven to rotate together. After the wheel plug contacts with the bottom of the cavity, the top heads of the outer cam and the inner cam respectively prop against the outer shoe and the inner shoe (the maximum propping length of the outer cam and the inner cam to the outer shoe and the inner shoe), that is, the outer shoe and the inner shoe wear to the limit, and the outer cam and the inner cam can be prevented from continuing to rotate through the blocking of the wheel plug at the bottom of the cavity, if the outer cam and the inner cam continue to rotate, the outer shoe and the inner shoe can be pulled back under the tensile force of the extension spring, and the braking effect is lost.
In addition, the bottom of the cavity is provided with a sensor, and when the wheel plug is contacted with the bottom of the cavity, a driver can be informed of the fact that the brake performance reaches the limit through the sensor.
In order to achieve the second purpose, the invention adopts the following technical scheme: a braking method based on the automotive drum brake described in one of the above objects, comprising the steps of:
during braking, hydraulic oil enters a hydraulic cavity of the rotator through an oil inlet nozzle of the rotator, hydraulic oil in the hydraulic cavity pushes a wheel plug to perform arc sliding to the cavity, the wheel plug slides and drives a rotating wheel to rotate, and then an outer cam and an inner cam are driven to rotate together, the outer cam rotates to push an outer shoe to be close to the inner wall of the brake drum, and the inner cam rotates to push an inner shoe to be close to the outer wall of the brake drum.
The outer shoe slides along the outer chute of the brake member when moving, and the inner shoe slides along the inner chute of the brake member when moving.
When the outer shoe contacts with the inner wall of the brake drum, friction force is generated between the outer shoe and the brake drum to limit the rotation movement of the brake drum so as to brake.
When the inner shoe contacts with the outer wall of the brake cylinder, friction force is generated between the inner shoe and the brake cylinder to limit the rotation of the brake cylinder (the brake drum is limited quite) so as to brake.
Further, in the embodiment of the invention, in the step, when the outer shoe is pushed to contact with the inner wall of the brake drum, the first magnet sheet arranged on the outer shoe is shifted from the outer magnetic ring at the bottom of the brake cavity to be corresponding to the outer magnetic ring, and the first magnet sheet and the outer magnetic ring are attracted mutually.
When the inner shoe is pushed to contact with the outer wall of the brake cylinder, the second magnet sheet arranged on the inner shoe is staggered and converted into corresponding with the inner magnetic ring at the bottom of the brake cavity, and the second magnet sheet and the inner magnetic ring are attracted mutually.
The outer magnetic ring and the inner magnetic ring are attracted by non-rotational force to block the rotational movement of the brake drum, so that the braking effect is enhanced.
In order to achieve the third purpose, the invention adopts the following technical scheme: an automobile having the automobile drum brake described in one of the above objects.
Drawings
Fig. 1 is a perspective exploded view of an automotive drum brake according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a brake drum according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an arrangement structure of a brake member and a brake drum according to an embodiment of the present invention.
Fig. 4 is a schematic plan view of a rotator according to an embodiment of the present invention.
10. The transmission shaft, 11, the connecting disc, 12, the connecting hole, 13 and the bolt;
20. the brake drum, 21, the brake cylinder, 22, the brake cavity, 23, the shaft hole, 24, the joint hole, 25, the outer magnetic ring, 26 and the inner magnetic ring;
30. a bearing;
40. a brake member 41, an outer runner 42, an inner runner 43, an outer shoe 431, an outer joint plate 44, an inner shoe 441, an inner joint plate 45, and an extension spring;
50. the rotary device comprises a rotator, 51, an outer cam, 52, an inner cam, 53, a rotating wheel, 54, a wheel plug, 55, a hydraulic cavity, 56, a cavity, 57, an oil inlet nozzle, 58 and a sensor;
60. a holder 61, a first ring, 62, a second ring.
Detailed Description
In order to make the objects, technical solutions, and advantages of the present invention more apparent, the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are some, but not all, embodiments of the present invention, are intended to be illustrative only and not limiting of the embodiments of the present invention, and that all other embodiments obtained by persons of ordinary skill in the art without making any inventive effort are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "a," an, "" the first, "" the second, "" the third, "" the fourth, "" the fifth, "and the sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
For purposes of brevity and description, the principles of the embodiments are described primarily by reference to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. However, it is apparent that. It will be apparent to one of ordinary skill in the art that the embodiments may be practiced without limitation to these specific details. In some instances, well known braking methods and structures have not been described in detail in order to avoid unnecessarily obscuring such embodiments. In addition, all embodiments may be used in combination with each other.
Example 1
The drawings of the specification are taken as the content of the specification, and the structural shapes, connection relationships, coordination relationships and positional relationships which can be obtained unambiguously in the drawings of the specification are understood as the content of the specification.
As shown in fig. 1, the drum brake for the automobile comprises a transmission shaft 10, a brake drum 20 and a brake member 40, wherein the brake drum 20 and the brake member 40 are concentrically arranged on the transmission shaft 10, the brake drum 20 is fixed with the transmission shaft 10, and the brake member 40 is connected with the transmission shaft 10 through a bearing 30.
As shown in fig. 2, a brake cylinder 21 is fixedly connected to the inside of the brake drum 20, and a brake chamber 22 is formed between the brake cylinder 21 and the brake drum 20.
As shown in fig. 1, the brake member 40 is provided with an outer runner 41 and an inner runner 42, the brake member 40 includes an outer shoe 43 and an inner shoe 44, the outer shoe 43 is slidably connected with the outer runner 41, the inner shoe 44 is slidably connected with the inner runner 42, the outer shoe 43 and the inner shoe 44 are concentrically arranged in the brake chamber 22, and neither the outer shoe 43 nor the inner shoe 44 is in contact with a wall surface of the brake chamber 22.
As shown in fig. 3, an extension spring 45 is provided between the outer shoe 43 and the inner shoe 44.
A rotator 50 is arranged between the outer shoe 43 and the inner shoe 44, the rotator 50 is fixed on the braking member 40, the rotating end of the rotator 50 is connected with an outer cam 51 and an inner cam 52, the outer cam 51 is propped against the outer shoe 43, the inner cam 52 is propped against the inner shoe 44, and the rotator 50 drives the outer cam 51 and the inner cam 52 to rotate so as to push the outer shoe 43 to contact the brake drum 20 and push the inner shoe 44 to contact the brake cylinder 21.
Specifically, as shown in fig. 2, the brake drum 20 and the brake cylinder 21 are integrally connected, and the brake drum 20 and the brake cylinder 21 are in a concentric cylindrical shape.
Specifically, as shown in fig. 1 and 2, the front end of the transmission shaft 10 is provided with a connection disc 11, connection holes 12 are distributed on the connection disc 11, an engagement hole 24 is provided in a shaft hole 23 in the brake cylinder 21, the transmission shaft 10 and the connection disc 11 are arranged in the shaft hole 23, the connection hole 12 is aligned with the engagement hole 24, and the connection hole 12 and the engagement hole 24 are connected by screw threads of the bolt 13.
Specifically, as shown in fig. 1 and 2, an outer magnetic ring 25 is embedded at the outer bottom of the brake chamber 22, an inner magnetic ring 26 is embedded at the inner bottom of the brake chamber 22, a first magnet sheet (not shown) is arranged at the end surface of the outer shoe 43 opposite to the bottom of the brake chamber 22, a second magnet sheet (not shown) is arranged at the end surface of the inner shoe 44 opposite to the bottom of the brake chamber 22, the first magnet sheet is staggered with the outer magnetic ring 25, and the second magnet sheet is staggered with the inner magnetic ring 26.
When the outer shoe 43 is pushed to contact with the brake drum 20, the first magnet piece is shifted from phase to correspond to the outer magnetic ring 25, and the first magnet piece and the outer magnetic ring 25 are attracted to each other.
When the inner shoe 44 is pushed to contact the brake cylinder 21, the second magnet piece is shifted from being staggered to be corresponding to the inner magnetic ring 26, and the second magnet piece and the inner magnetic ring 26 are attracted to each other.
The outer magnet ring 25 and the inner magnet ring 26 receive attractive force of non-rotational force to block rotational movement of the brake drum 20 so as to enhance braking effect. Moreover, the enhanced braking effect does not increase the friction force between the outer shoe 43 and the inner shoe 44, and can reduce the problems of abrasion and friction overheating.
Specifically, as shown in fig. 1, the outer shoe 43 is provided at the upper and lower ends thereof with external plates 431 extending in the direction of the inner shoe 44, the inner shoe 44 is provided at the upper and lower ends thereof with internal plates 441 extending in the direction of the outer shoe 43, one end of the extension spring 45 is fixed to the external plates 431, and the other end of the extension spring 45 is fixed to the internal plates 441.
The upper and lower ends of the outer shoe 43 extend out of the outer connecting plate 431, the upper and lower ends of the inner shoe 44 extend out of the inner connecting plate 441, connection of the extension springs 45 is facilitated, the extension springs 45 are distributed at the upper and lower ends of the outer shoe 43 and the upper and lower ends of the inner shoe 44, so that stability of the outer shoe 43 and the inner shoe 44 during braking can be better, the heights of the outer shoe 43 and the inner shoe 44 can be higher, the contact area between the outer shoe 43 and the brake drum 20 and the brake cylinder 21 is larger, and the braking effect is better.
More specifically, as shown in fig. 1, a plurality of retainers 60 are fixedly connected to the brake member 40, the retainers 60 are connected to each other by a first ring 61 and a second ring 62, the first ring 61 and the second ring 62 pass through the gaps between the outer shoes 43 and the inner shoes 44, and the rotator 50 is clamped between the first ring 61 and the second ring 62 for fixation.
When the upper and lower ends of the outer shoes 43 extend out of the outer plate 431 and the upper and lower ends of the inner shoes 44 extend out of the inner plate 441, the rotator 50 is not easily fixed in the vertical direction of the outer shoes 43 and the inner shoes 44, and the fixator 60 is arranged outside the outer shoes 43 and the inner shoes 44, and the first and second rings 61 and 62 of the fixator 60 can pass through the side gap between the outer shoes 43 and the inner shoes 44, so as to facilitate the fixation of the rotator 50.
Specifically, as shown in fig. 3 and 4, an arc-shaped pressure chamber is provided in the rotator 50, a rotating wheel 53 is provided in the pressure chamber, the rotating wheel 53 is a rotating end of the rotator 50, and the rotating wheel 53 connects the outer cam 51 and the inner cam 52.
The pressure chamber is also provided with a wheel plug 54 connected with the rotating wheel 53, the wheel plug 54 divides the pressure chamber into a hydraulic chamber 55 and a cavity 56, the hydraulic chamber 55 is separated from the cavity 56, and the wheel plug 54 slides along the hydraulic chamber 55 or the cavity 56 to drive the rotating wheel 53 to rotate.
The rotator 50 is provided with an oil inlet nozzle 57, and the oil inlet nozzle 57 communicates with the hydraulic chamber 55.
The invention has the advantages that the rotator 50 is arranged between the outer shoe 43 and the inner shoe 44, the rotator 50 drives the outer cam 51 and the inner cam 52 to rotate, the outer shoe 43 is pushed to contact the brake drum 20, the inner shoe 44 is pushed to contact the brake drum 21, and the brake drum 20 is prevented from rotating to brake. The rotator 50 moves in a rotating manner, foreign matters such as external rainwater and dust and sand are not easy to invade into the rotator 50, and the braking effect of the automobile can be ensured.
And, the hydraulic chamber 55 and the cavity 56 in the rotator 50 are arc-shaped structures, and the hydraulic oil filled in the hydraulic chamber 55 pushes the wheel plug 54 to perform arc-shaped sliding towards the cavity 56, so that the rotating wheel 53, the outer cam 51 and the inner cam 52 can be driven to rotate together. After the hydraulic cavity 55 is separated from the cavity 56, the wheel plug 54 contacts the bottom of the cavity 56, the top ends of the outer cam 51 and the inner cam 52 respectively support against the outer shoe 43 and the inner shoe 44 (the maximum supporting lengths of the outer cam 51 and the inner cam 52 against the outer shoe 43 and the inner shoe 44), that is, the outer shoe 43 and the inner shoe 44 wear to the limit at this time, and the outer cam 51 and the inner cam 52 can be prevented from rotating continuously by blocking the wheel plug 54 by the bottom of the cavity 56, if the outer cam 51 and the inner cam 52 rotate continuously, the outer shoe 43 and the inner shoe 44 will be pulled back under the pull of the tension spring 45, and the braking effect is lost.
In addition, a sensor 58 is arranged at the bottom of the cavity 56, and when the wheel plug 54 is contacted with the bottom of the cavity 56, a driver can be informed of the fact that the braking performance reaches the limit through the sensor 58.
Example 2
A braking method based on the automotive drum brake in the above embodiment 1, comprising the steps of:
during braking, hydraulic oil enters the hydraulic cavity 55 of the rotator 50 through the oil inlet 57 of the rotator 50, hydraulic oil in the hydraulic cavity 55 pushes the wheel plug 54 to perform arc sliding towards the cavity 56, the wheel plug 54 slides and drives the rotating wheel 53 to rotate, and then the outer cam 51 and the inner cam 52 are driven to rotate together, the outer cam 51 rotates to push the outer shoe 43 to be close to the inner wall of the brake drum 20, and the inner cam 52 rotates to push the inner shoe 44 to be close to the outer wall of the brake drum 21.
The outer shoes 43 slide along the outer slide grooves 41 of the brake member 40 when moving, and the inner shoes 44 slide along the inner slide grooves 42 of the brake member 40 when moving.
When the outer shoes 43 contact the inner wall of the brake drum 20, friction is generated between the outer shoes 43 and the brake drum 20, and the rotational movement of the brake drum 20 is restricted to perform braking.
When the inner shoes 44 contact the outer wall of the brake drum 21, friction is generated between the inner shoes 44 and the brake drum 21, and the rotational movement of the brake drum 21 (which considerably restricts the brake drum 20) is restricted to perform braking.
The rotator 50 is rotated, and foreign substances such as wind, rain, dust and the like are not easily introduced into the rotator 50, so that a braking effect can be secured. The rotator 50 has an arc-shaped hydraulic chamber 55 and a cavity 56, but the hydraulic chamber 55 is separated from the cavity 56, the wheel plug 54 contacts with the bottom of the cavity 56, the heads of the outer cam 51 and the inner cam 52 abut against the outer shoe 43 and the inner shoe 44 (refer to fig. 3, after the outer cam 51 and the inner cam 52 rotate 90 degrees, the heads of the outer cam 51 and the inner cam 52 abut against the outer shoe 43 and the inner shoe 44), that is, the outer shoe 43 and the inner shoe 44 wear to the limit at this time, the wheel plug 54 is blocked by the bottom of the cavity 56, so that the outer cam 51 and the inner cam 52 can be prevented from rotating continuously, and the braking effect is avoided.
Specifically, in the above steps, when the outer shoe 43 is pushed to contact the inner wall of the brake drum 20, the first magnet piece provided on the outer shoe 43 is shifted from being in correspondence with the outer magnetic ring 25 at the bottom of the brake chamber 22, and the first magnet piece and the outer magnetic ring 25 attract each other.
When the inner shoe 44 is pushed to contact with the outer wall of the brake cylinder 21, the second magnet piece arranged on the inner shoe 44 is staggered from the inner magnetic ring 26 at the bottom of the brake cavity 22 to correspond to the inner magnetic ring 26, and the second magnet piece and the inner magnetic ring 26 are attracted to each other.
The outer magnet ring 25 and the inner magnet ring 26 receive attractive force of non-rotational force to block rotational movement of the brake drum 20 so as to enhance braking effect.
Example 3
An automobile having the automobile drum brake in embodiment 1 described above.
While the foregoing describes the illustrative embodiments of the present invention so that those skilled in the art may understand the present invention, the present invention is not limited to the specific embodiments, and all inventive innovations utilizing the inventive concepts are herein within the scope of the present invention as defined and defined by the appended claims, as long as the various changes are within the spirit and scope of the present invention.

Claims (10)

1. The automobile drum brake is characterized by comprising a transmission shaft, a brake drum and a brake member, wherein the brake drum and the brake member are concentrically arranged on the transmission shaft, the brake drum is fixed with the transmission shaft, and the brake member is connected with the transmission shaft through a bearing;
a brake cylinder is fixedly connected in the brake drum, and a brake cavity is formed between the brake cylinder and the brake drum;
the brake component is provided with an outer chute and an inner chute, the brake component comprises an outer shoe and an inner shoe, the outer shoe is in sliding connection with the outer chute, the inner shoe is in sliding connection with the inner chute, the outer shoe and the inner shoe are concentrically arranged in the brake cavity, and neither the outer shoe nor the inner shoe is in contact with the wall surface of the brake cavity;
an extension spring is arranged between the outer shoe and the inner shoe;
the outer shoe comprises a brake member, wherein a rotor is arranged between the outer shoe and the inner shoe, the rotor is fixed on the brake member, the rotating end of the rotor is connected with an outer cam and an inner cam, the outer cam abuts against the outer shoe, the inner cam abuts against the inner shoe, and the outer cam and the inner cam are driven to rotate through the rotor so as to push the outer shoe to contact the brake drum and push the inner shoe to contact the brake drum.
2. The automotive drum brake of claim 1, wherein the brake drum and the brake cylinder are of an integral connection structure and the brake drum and the brake cylinder are of a concentric cylindrical shape.
3. The drum brake of claim 1, wherein the front end of the transmission shaft is provided with a connection disc, connection holes are distributed on the connection disc, joint holes are arranged in shaft holes in the brake cylinder, the transmission shaft and the connection disc are arranged in the shaft holes, the connection holes are aligned with the joint holes, and the connection holes and the joint holes are connected through screw threads.
4. The automobile drum brake of claim 1, wherein an outer magnetic ring is embedded at the outer bottom edge of the brake cavity, an inner magnetic ring is embedded at the inner bottom edge of the brake cavity, a first magnet sheet is arranged at the end surface of the outer shoe, which is opposite to the bottom of the brake cavity, a second magnet sheet is arranged at the end surface of the inner shoe, which is opposite to the bottom of the brake cavity, and the first magnet sheet is staggered with the outer magnetic ring, and the second magnet sheet is staggered with the inner magnetic ring;
when the outer shoe is pushed to be in contact with the brake drum, the first magnet piece and the outer magnetic ring are staggered to be converted into corresponding positions, and the first magnet piece and the outer magnetic ring are attracted to each other;
when the inner shoe is pushed to be in contact with the brake cylinder, the second magnet piece and the inner magnetic ring are staggered from each other to be converted into corresponding, and the second magnet piece and the inner magnetic ring are attracted to each other.
5. The automobile drum brake of claim 1, wherein the outer shoe upper and lower ends are provided with external plates extending in the inner shoe direction, the inner shoe upper and lower ends are provided with internal plates extending in the outer shoe direction, one end of the extension spring is fixed on the outer plate, and the other end of the extension spring is fixed on the inner plate.
6. The automotive drum brake of claim 5, wherein a plurality of retainers are fixedly connected to the brake member, the retainers are connected to each other by a first ring and a second ring, the first ring and the second ring pass through a side gap between the outer shoe and the inner shoe, and the rotator is clamped between the first ring and the second ring for fixation.
7. The automobile drum brake of claim 1, wherein an arc-shaped pressure chamber is arranged in the rotator, a rotating wheel is arranged in the pressure chamber, the rotating wheel is a rotating end of the rotator, and the rotating wheel is connected with the outer cam and the inner cam;
the pressure cavity is also internally provided with a wheel plug connected with the rotating wheel, the wheel plug divides the pressure cavity into a hydraulic cavity and a cavity, the hydraulic cavity is separated from the cavity, and the wheel plug slides along the hydraulic cavity or the cavity to drive the rotating wheel to rotate;
the rotator is provided with an oil inlet nozzle, and the oil inlet nozzle is communicated with the hydraulic cavity.
8. A braking method, characterized in that it is based on the automotive drum brake as described in claim 7, comprising the steps of:
during braking, hydraulic oil enters a hydraulic cavity of the rotator through an oil inlet nozzle of the rotator, hydraulic oil in the hydraulic cavity pushes a wheel plug to perform arc sliding towards the cavity, the wheel plug slides and drives a rotating wheel to rotate, and then an outer cam and an inner cam are driven to rotate together, the outer cam rotates to push an outer shoe to be close to the inner wall of the brake drum, and the inner cam rotates to push an inner shoe to be close to the outer wall of the brake drum;
the outer shoe slides along the outer chute of the brake member when moving, and the inner shoe slides along the inner chute of the brake member when moving;
when the outer shoe is contacted with the inner wall of the brake drum, friction force is generated between the outer shoe and the brake drum, and the rotation movement of the brake drum is limited so as to brake;
when the inner shoe is contacted with the outer wall of the brake cylinder, the inner shoe and the brake cylinder generate friction force to limit the rotation movement of the brake cylinder so as to brake.
9. The braking method according to claim 8, wherein in the step, when the outer shoe is pushed to contact with the inner wall of the brake drum, the first magnet piece provided on the outer shoe is shifted from the outer magnet ring at the bottom of the brake chamber to correspond to the outer magnet ring, and the first magnet piece and the outer magnet ring are attracted to each other;
when the inner shoe is pushed to contact with the outer wall of the brake cylinder, the second magnet sheet arranged on the inner shoe is staggered from the inner magnetic ring at the bottom of the brake cavity to be corresponding to the inner magnetic ring, and the second magnet sheet and the inner magnetic ring are attracted to each other;
the outer magnetic ring and the inner magnetic ring are attracted by non-rotational force to block the rotational movement of the brake drum, so that the braking effect is enhanced.
10. An automobile, characterized in that it has an automobile drum brake according to any one of the preceding claims 1-7.
CN202311007462.1A 2023-08-11 2023-08-11 Automobile drum brake, braking method and automobile Active CN116753252B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1511976A (en) * 1924-04-03 1924-10-14 Lorenzo O Markham Vehicle brake
FR595915A (en) * 1924-04-03 1925-10-12 Brake for vehicles
GB573242A (en) * 1943-06-22 1945-11-13 Alfred Augustus Thornton Improvements in friction brakes
US3205978A (en) * 1963-01-22 1965-09-14 John H Broseke Brake having concentrically mounted shoes
DE1201194B (en) * 1962-12-07 1965-09-16 Teves Kg Alfred Brake with brake shoes acting in pairs on the outer circumference and on the inner circumference of the brake drum, in particular for motor vehicles
US20140116819A1 (en) * 2012-11-01 2014-05-01 Bendix Spicer Foundation Brake Llc Brake having lever and idler brake shoes
CN110617286A (en) * 2019-10-17 2019-12-27 吉林大学 Electronic parking brake drum brake

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1511976A (en) * 1924-04-03 1924-10-14 Lorenzo O Markham Vehicle brake
FR595915A (en) * 1924-04-03 1925-10-12 Brake for vehicles
GB573242A (en) * 1943-06-22 1945-11-13 Alfred Augustus Thornton Improvements in friction brakes
DE1201194B (en) * 1962-12-07 1965-09-16 Teves Kg Alfred Brake with brake shoes acting in pairs on the outer circumference and on the inner circumference of the brake drum, in particular for motor vehicles
US3205978A (en) * 1963-01-22 1965-09-14 John H Broseke Brake having concentrically mounted shoes
US20140116819A1 (en) * 2012-11-01 2014-05-01 Bendix Spicer Foundation Brake Llc Brake having lever and idler brake shoes
CN110617286A (en) * 2019-10-17 2019-12-27 吉林大学 Electronic parking brake drum brake

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