CN111536173A - Brake shoe mechanism and brake device - Google Patents
Brake shoe mechanism and brake device Download PDFInfo
- Publication number
- CN111536173A CN111536173A CN202010372084.7A CN202010372084A CN111536173A CN 111536173 A CN111536173 A CN 111536173A CN 202010372084 A CN202010372084 A CN 202010372084A CN 111536173 A CN111536173 A CN 111536173A
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- China
- Prior art keywords
- brake
- brake shoe
- shoe
- assembly
- alarm
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- 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
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
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- 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
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
- F16D65/22—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for pressing members apart, e.g. for drum brakes
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- 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
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D66/02—Apparatus for indicating wear
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- 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
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- 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
- F16D2125/30—Cams; Levers with cams acting on two or more cam followers, e.g. S-cams
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention belongs to the technical field of vehicles and discloses a brake shoe mechanism and a brake device. This brake shoe mechanism includes: a brake shoe assembly; the roller penetrates through the brake shoe component and is fixed on the brake shoe component through the elastic component; the cam shaft is configured to abut against the roller and push the brake shoe assembly to move through the roller, so that the outer side of the brake friction plate assembly abuts against the inner wall of the brake drum and the brake process is finished; and one end of the alarm elastic sheet is arranged on the side surface of the brake shoe assembly, the other end of the alarm elastic sheet is arranged on a preset position, and when the brake friction sheet assembly is abraded to the preset position, the alarm elastic sheet is configured to abut against the inner wall of the brake drum and generate a sound signal to alarm. This brake shoe mechanism adopts the alarm device of acoustics to report to the police, simple structure, and the assembly is simple, can report to the police in real time, and the warning accuracy is high.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a brake shoe mechanism and a brake device.
Background
With the development of the automobile industry, drum brakes are widely applied to commercial vehicles, and the requirements on the timeliness and convenience of maintenance and replacement of various parts of the vehicles are higher and higher. The drum brake shoe assembly needs to be replaced for multiple times according to the abrasion condition of a brake friction plate in the service life period of the whole vehicle, the replacement period is related to the use working condition of a user, and the replacement period cannot be unified. The brake friction plate is generally connected with the shoe through the rivet, if the friction plate is worn excessively and cannot be replaced in time, the rivet can rub with the brake drum, the working surface of the brake drum can be damaged, even the brake drum is damaged, the use cost of a user is increased, and even the driving safety is influenced. For this reason, in the relevant national standard, passenger cars, trucks and special work vehicles with a total mass of more than 3500kg, which are equipped with automatic brake clearance adjusting devices, should be warned to the driver in the driver's seat by an optical or acoustic warning device when the service brake linings need to be replaced.
At present, abrasion alarm wires or abrasion alarms are additionally arranged in drum brake shoe assemblies in the industry, and when a friction plate is abraded to a limit position, the abrasion alarm wires or the abrasion alarms give an alarm. The structural form of the abrasion alarm wire is adopted, the abrasion alarm wire is generally required to be arranged on a friction plate, the friction plate is in friction with a brake drum in the working process, the working temperature is higher than 500 ℃, the alarm wire is required to be made of high-temperature resistant materials, and the cost of raw materials is high. In addition, the alarm line moves along with the shoe plate assembly, is easy to interfere and wear with parts inside the brake, needs to be additionally provided with a fixed point for the alarm line, and has higher requirements on installation and fixation of the drum brake. Adopt the structural style of wearing and tearing alarm, through installing the alarm on the camshaft, the camshaft rotates along with the friction disc wearing and tearing, when rotating certain angle, the sensor reports to the police, and this scheme needs increase the camshaft extension mounted position, increase cost. Meanwhile, due to the fact that multiple parts are transmitted in the middle, interference of external factors such as camshaft deformation cannot be eliminated, and real-time alarming cannot be achieved.
Disclosure of Invention
The invention aims to provide a brake shoe mechanism and a brake device, which have the advantages of simple structure, convenience in assembly and lower production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a brake shoe mechanism, comprising:
a brake shoe assembly;
the roller penetrates through the brake shoe component and is fixed on the brake shoe component through an elastic piece;
the cam shaft is configured to abut against the roller and push the brake shoe assembly to move through the roller, so that the outer side of the brake friction plate assembly abuts against the inner wall of the brake drum;
and one end of the alarm elastic sheet is arranged on the side surface of the brake shoe assembly, the other end of the alarm elastic sheet is arranged on a preset position, and when the brake friction sheet assembly is abraded to the preset position, the alarm elastic sheet is configured to abut against the inner wall of the brake drum and generate a sound signal to alarm.
Preferably, the brake shoe assembly comprises:
the side surface of the brake shoe rib plate is provided with the roller and the alarm elastic sheet respectively;
and the brake shoe web plate is arranged on the peripheral surface of the brake shoe rib plate and is positioned between the brake shoe rib plate and the brake friction plate assembly.
Preferably, the brake shoe web is provided with an installation hole, the outer circumferential surface of the brake shoe rib plate is provided with a wedge block corresponding to the installation hole, and the wedge block is clamped in the installation hole.
Preferably, a rivet hole is formed in the web of the brake shoe, and a rivet penetrates through the brake friction plate assembly and the rivet hole.
Preferably, the preset position is a position which is greater than a preset distance of 1mm in the radial direction of the brake drum, wherein the preset distance is a maximum distance between the center of the brake drum and the rivet head.
Preferably, the alarm elastic sheet comprises:
a first fixing part and a second fixing part which are respectively and symmetrically arranged at two sides of the brake horseshoe rib plate,
the two ends of the connecting part are respectively connected to the first fixing part and the second fixing part and are abutted against the outer peripheral surface of the brake shoe rib plate;
the extension part is arranged on one side, away from the first fixing part, of the connecting part, and one end, away from the connecting part, of the extension part is arranged on the preset position.
Preferably, a limiting groove is formed in the outer peripheral surface of the brake shoe rib plate, the connecting portion is arranged in the limiting groove, a threaded hole is formed in one side, away from the roller, of the side surface of the brake shoe rib plate, and a connecting bolt penetrates through the first fixing portion, the second fixing portion and the threaded hole respectively.
Preferably, the brake pad assembly includes:
the first brake friction plate is arranged on the lower side of the brake shoe assembly, and the thickness of the first brake friction plate along the radial direction of the brake drum is gradually reduced from the roller to the alarm elastic sheet;
the second brake friction plate is arranged on the upper side of the brake shoe assembly, the outer side of the second brake friction plate can abut against the inner wall of the brake drum, and the thickness of the second brake friction plate along the radial direction of the brake drum is gradually reduced from the roller to the alarm elastic sheet.
In order to achieve the above object, the present invention further provides a brake apparatus, which includes a brake chamber, an adjusting arm, a cam shaft, a brake drum, a shoe shaft, and the above brake shoe mechanism, wherein the brake shoe mechanism is rotatably connected to the brake drum through the shoe shaft, the brake chamber is configured to convert high-pressure gas of a brake system into thrust, and the brake chamber is configured to push the cam shaft to rotate through the adjusting arm, so that the brake shoe mechanism is opened and attached to the brake drum.
Preferably, the brake shoe mechanism further comprises a first reset member and a second reset member, the number of the brake shoe mechanisms is two, the two brake shoe mechanisms are symmetrically arranged on two sides of the brake base plate, two ends of the first reset member are respectively connected to one side, close to the shoe shaft, of each of the two brake shoe mechanisms, and two ends of the second reset member are respectively connected to one side, far away from the shoe shaft, of each of the two brake shoe mechanisms.
The invention has the beneficial effects that:
according to the brake shoe mechanism provided by the invention, the contact resistance between the cam shaft and the brake shoe component is reduced by arranging the roller and utilizing rolling friction. The roller is fixed on the brake shoe component through the elastic component, and the fixing effect is good. The cam shaft pushes the brake shoe component to move by abutting against the roller and pushing the roller, so that the outer side of the brake friction plate component abuts against the inner wall of the brake drum, at the moment, the brake friction plate component is expanded and attached to the inner wall of the brake drum, friction is generated, and the braking process is finished. The alarm elastic sheet is arranged on the side face of the brake shoe sheet assembly, the other end of the alarm elastic sheet is arranged on a preset position, when the brake friction sheet assembly is abraded to the preset position, if the brake process occurs again, the alarm elastic sheet can abut against the inner wall of the brake drum, and the alarm elastic sheet is in contact with the brake drum to generate mechanical collision, so that a sound signal is sent out to alarm and prompt a driver to replace the brake friction sheet assembly.
Compared with the structure form of adopting the abrasion alarm wire in the prior art, the brake device provided by the invention can realize alarm without adopting expensive high-temperature-resistant materials, has low cost of original materials, does not need to be close to other internal parts to generate interference, simplifies the assembly difficulty, saves the assembly time and improves the production efficiency.
Drawings
FIG. 1 is a schematic view of the construction of the braking apparatus of the present invention;
FIG. 2 is a schematic structural view of the brake shoe mechanism of the present invention;
FIG. 3 is a schematic view of a brake shoe assembly of the brake shoe mechanism of the present invention from one perspective;
FIG. 4 is a schematic structural view of another perspective of a brake shoe assembly of the brake shoe mechanism of the present invention;
FIG. 5 is a schematic view of a brake shoe web in the brake shoe mechanism of the present invention;
FIG. 6 is a schematic view of another perspective of a brake shoe web in the brake shoe mechanism of the present invention;
FIG. 7 is a schematic structural view of a brake shoe rib plate in the brake shoe mechanism of the present invention;
FIG. 8 is a schematic view of the structure of the roller of the brake shoe mechanism of the present invention;
FIG. 9 is a schematic view of a perspective view of a resilient member of the brake shoe mechanism of the present invention;
FIG. 10 is a schematic view of an alternate perspective of the resilient member of the brake shoe mechanism of the present invention;
FIG. 11 is a schematic view of a further perspective of the resilient member of the brake shoe mechanism of the present invention;
FIG. 12 is a schematic view of the structure of the alarm striking plate in the brake shoe mechanism according to the present invention;
FIG. 13 is a schematic structural view of another perspective of the alarm resilient tab of the brake shoe mechanism of the present invention;
FIG. 14 is a schematic structural view of another perspective of the alarm resilient plate of the brake shoe mechanism of the present invention;
FIG. 15 is a perspective view of the interaction of the alarm clip and the brake drum of the brake shoe mechanism of the present invention;
FIG. 16 is a schematic illustration of the construction of the brake pad assembly of the brake shoe mechanism of the present invention;
fig. 17 is a cross-sectional view at a-a of fig. 16.
In the figure:
10. a brake shoe mechanism; 20. a brake chamber; 30. an adjusting arm; 40. a camshaft; 50. braking the bottom plate; 60. a hoof sheet axis; 70. a cam bracket; 80. a first reset member; 90. a second reset member;
01. presetting a position; 02. the center of the outer diameter of the friction plate; 03. a brake center; 04. a gap;
1. a brake shoe assembly; 2. a roller; 3. a brake pad assembly; 4. an alarm spring plate; 5. an elastic member; 6. riveting; 7. a connecting bolt;
11. a brake shoe rib plate; 12. a brake shoe web; 121. mounting holes; 122. rivet holes;
111. a wedge block; 112. a first through hole; 113. a second through hole; 114. a third through hole; 115. a limiting groove; 116. a threaded hole;
21. a large end portion; 22. a small end portion;
31. a first brake pad; 32. a second brake pad;
41. a first fixed part; 42. a second fixed part; 43. a connecting portion; 44. an extension portion;
51. a tail portion; 52. a tip portion; 53. an intermediate portion.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment provides a brake device which is used in the field of vehicles such as commercial vehicles. As shown in fig. 1, the brake apparatus includes a brake shoe mechanism 10, a brake chamber 20, an adjusting arm 30, a cam shaft 40, a brake base plate 50, a shoe shaft 60 and a cam bracket 70, wherein the cam shaft 40 is supported on the adjusting arm 30 through the cam bracket 70, the brake shoe mechanism 10 is rotatably connected to a brake drum through the shoe shaft 60, the brake chamber 20 is used for containing high-pressure gas, and when the high-pressure gas enters the brake chamber 20 as a whole, the brake chamber 20 is configured to push the cam shaft 40 to rotate through the adjusting arm 30, so that the brake shoe mechanism 10 is opened and attached to the brake drum to generate friction, thereby completing a braking process.
Compared with the structure form of adopting a wear alarm line in the prior art, the braking device provided by the embodiment can realize alarm without adopting expensive high-temperature-resistant materials, has low cost of raw materials, does not need to be close to other parts inside to generate interference, simplifies the assembly difficulty, saves the assembly time and improves the production efficiency.
The number of the brake shoe mechanisms 10 is preferably two, the two brake shoe mechanisms 10 are symmetrically arranged on two sides of the brake drum, and the two brake shoe mechanisms 10 can rotate towards a direction close to or away from each other to realize braking and brake releasing of the brake drum. In order to enable the two brake shoe mechanisms 10 to be reset in time after the brake is released, the brake device further includes a first reset member 80 and a second reset member 90, the first reset member 80 is specifically a shoe axle spring, and two ends of the first reset member 80 are respectively connected to one side of the two brake shoe mechanisms 10 close to the shoe axle 60, and are used for resetting the two brake shoe mechanisms 10 near the shoe axle 60. The second reset member 90 is specifically a return spring, and two ends of the second reset member 90 are respectively connected to one side of the two brake shoe mechanisms 10 away from the shoe axle 60, so as to reset the two brake shoe mechanisms 10 at a position near the position away from the shoe axle 60. Therefore, the two brake shoe mechanisms 10 are connected to the brake base plate 50 through the first and second reset members 80 and 90, wherein the mounting through holes on the brake shoe rib plate 11 are clamped to the shoe shafts 60 of the brake base plate 50.
The present embodiment further provides a brake shoe mechanism 10, as shown in fig. 2, the brake shoe mechanism 10 includes: brake shoe subassembly 1, gyro wheel 2, brake friction disc subassembly 3 and warning shell fragment 4, gyro wheel 2 wears to locate brake shoe subassembly 1 and fixes on brake shoe subassembly 1 through elastic component 5, and brake friction disc subassembly 3 sets up in the outside of the 1 outer peripheral face of brake shoe subassembly. Meanwhile, the maximum included angle between the outer edge of the installed brake friction plate assembly 3 and the center of the brake shoe assembly 1 is less than 120 degrees. One end of the alarm elastic sheet 4 is arranged on the side surface of the brake shoe component 1, and the other end of the alarm elastic sheet is arranged on the preset position 01. The cam shaft 40 is configured to abut against the roller 2 and push the brake shoe assembly 1 to move through the roller 2, so that the outer side of the brake pad assembly 3 abuts against the inner wall of the brake drum 50 for completing the braking process. When the brake friction plate assembly 3 is worn to the preset position 01, the alarm elastic sheet 4 is configured to abut against the inner wall of the brake drum 50 and generate a sound signal to alarm.
The brake shoe mechanism 10 that this embodiment provided, through setting up gyro wheel 2, utilize rolling friction, the contact resistance between camshaft 40 and the brake shoe subassembly 1 has been reduced, fix gyro wheel 2 on the brake shoe subassembly 1 through elastic component 5, it is fixed effectual, camshaft 40 passes through the butt in gyro wheel 2 and promotes the motion of brake shoe subassembly 1 through gyro wheel 2, with the outside butt with brake friction disc subassembly 3 in the inner wall of brake drum 50, brake friction disc subassembly 3 opens and laminates mutually with the inner wall of brake drum this moment, produce friction, thereby accomplish braking process. Through being provided with warning shell fragment 4 in the side of brake shoe piece subassembly 1, the other end of warning shell fragment 4 sets up on presetting position 01, when brake friction disc subassembly 3 wearing and tearing to presetting position 01, if the braking process appears once more, warning shell fragment 4 can the butt in the inner wall of brake drum 50, and warning shell fragment 4 and brake drum 50 contact and produce mechanical collision to the audible signal who sends is reported to the police and is indicateed the driver and change brake friction disc subassembly 3.
This brake shoe mechanism 10, when brake friction disc subassembly 3 need be changed, adopts the alarm device of acoustics to report to the police to the driver on the driver's seat, compares with prior art adoption wearing and tearing alarm's structural style, need not to reform transform camshaft 40, simple structure, simultaneously, for mechanical collision contact between warning shell fragment 4 and the brake drum 50, need not to consider middle transmission part deformation and assembly problem, can report to the police in real time, and the warning accuracy is high.
Further, as shown in fig. 3-4, the brake shoe assembly 1 includes a brake shoe rib plate 11 and a brake shoe web 12, and the brake shoe rib plate 11 and the brake shoe web 12 are welded into an integral structure, so that the connectivity is good and the structure is stable. The brake shoe rib plate 11 and the brake shoe web 12 are both arc-shaped structures, and optionally, the inner diameter R3 of the brake shoe web 12 is the same as the radius R4 of the outer arc surface of the brake shoe rib plate 11 (as shown in fig. 6 and 7), so that the brake shoe rib plate 11 and the brake shoe web 12 are attached to each other, and the structural tightness is good.
The side surface of the brake horseshoe rib plate 11 is respectively provided with a roller 2 and an alarm elastic sheet 4, and the brake horseshoe rib plate 11 is used for installing and fixing the roller 2 and the alarm elastic sheet 4. The brake shoe web 12 is arranged on the outer circumferential surface of the brake shoe rib plate 11 and is positioned between the brake shoe rib plate 11 and the brake friction plate assembly 3. The brake shoe web 12 plays a role in connecting the brake shoe rib plate 11 and the brake friction plate assembly 3, and supports the brake friction plate assembly 3. Under the mutual cooperation of the brake shoe rib plate 11 and the brake shoe web 12, the structural strength is enhanced, the supporting effect is good, and the bearing capacity is strong.
Alternatively, as shown in fig. 3, the number of the brake shoe rib plates 11 is two, and the two brake shoe rib plates 11 are arranged in parallel at intervals and symmetrically arranged on the inner circumferential surface of the brake shoe web 12. An installation groove is formed in the circumferential direction of the inner side circumferential surface of the brake shoe web 12 in a stamping mode, and the installation groove is used for installing the brake shoe rib plate 11. Preferably, the thickness F of the brake shoe rib plate 11 is smaller than the width E of the mounting groove, which facilitates the positioning of the initial mounting of the brake shoe rib plate 11 and the brake shoe web 12.
In order to ensure the installation stability of the brake shoe rib plate 11 and the brake shoe web 12, as shown in fig. 4-7, an installation hole 121 is formed in the brake shoe web 12, the installation hole 121 is specifically a rectangular through hole structure, a wedge block 111 is arranged on the outer circumferential surface of the brake shoe rib plate 11 corresponding to the installation hole 121, the wedge block 111 is clamped in the installation hole 121, and the connection strength between the brake shoe rib plate 11 and the brake shoe web 12 is ensured through the mutual matching of the wedge block 111 and the installation hole 121. By using the inclined surface structure of the wedge-shaped block 111, a guiding function can be achieved during installation, and convenience is provided for installation of the wedge-shaped block 111 and the installation hole 121.
Further, a rivet hole 122 is formed in the brake shoe web 12, and the rivet 6 is inserted through the brake friction plate assembly 3 and the rivet hole 122, so as to fix the brake friction plate assembly 3 to the brake shoe web 12. Optionally, the number of the rivet holes 122 is multiple, two circles of symmetrical rivet holes 122 are punched in the brake shoe web 12, and each circle of rivet holes 122 is uniformly arranged along the circumferential direction of the brake shoe web 12, so as to ensure the stability of the overall structure.
Because the brake friction disc assembly 3 is worn excessively and cannot be replaced in time, the rivet 6 rubs with the brake drum, the working surface of the brake drum can be damaged, the brake drum is even damaged, the use cost of a user is increased, and the driving safety is even affected. The distance of the preset distance is slightly larger than the distance of the head of the rivet 6, the alarm elastic sheet 4 reaches the preset position 01 before the brake drum and the rivet 6 are contacted, an alarm is given, the condition that the brake drum is damaged due to the contact of the rivet 6 and the working surface of the brake drum is avoided, the service life of the brake drum is guaranteed, the production cost is saved, and the safety is good.
Further, as shown in fig. 7, a first through hole 112 is formed in one side of the brake shoe rib plate 11, which is close to the roller 2, the first through hole 112 is of a circular hole structure, and the first through hole 112 is used for mounting the roller 2. As shown in fig. 8, the roller 2 includes a large end portion 21 and a small end portion 22, the two small end portions 22 are symmetrically disposed on two sides of the large end portion 21 along the axial direction, the large end portion 21 is used for abutting and pushing the camshaft 40, the small end portion 22 is a mounting position of the roller 2, and the small end portion 22 is used for being fixed on the first through hole 112 and the outer circumferential surface of the brake shoe rib plate 11 through the elastic member 5.
The elastic member 5 is specifically a connection spring, as shown in fig. 9-11, the connection spring includes two tail portions 51, two tip portions 52 and a middle portion 53, the tail portions 51 and the tip portions 52 are connected to each other, the two tip portions 52 are symmetrically disposed on two sides of the middle portion 53, the two tail portions 51 are symmetrically disposed on two sides of the middle portion 53, the tip portions 52 are respectively connected to the tail portions 51 and the middle portion 53, an arc diameter Φ 1 of the tail portions 51 of the connection spring is smaller than an outer diameter Φ 2 of the small end portions 22 (as shown in fig. 8 and 9), the connection spring is sleeved on the small end portions 22 of the roller 2 and then is expanded and fastened to the small end portions 22, then the connection spring and the roller 2 are integrally installed in the first through hole 112 of the brake shoe rib plate 11, at this time, the tip portions 52 of the connection spring abut against an inner wall of. Preferably, the intermediate portion 53 has a circular arc structure, and the transition effect is good.
Further, as shown in fig. 7, a second through hole 113 is formed in one side of the brake shoe rib plate 11, which is close to the roller 2, the second through hole 113 is used for connecting the second reset piece 90, and a hook of the second reset piece 90 is hooked in the second through hole 113. A third through hole 114 is formed in one side, close to the roller 2, of the brake shoe rib plate 11, the third through hole 114 is used for being connected with a first resetting piece 80, and a hook of the first resetting piece 80 is hooked in the third through hole 114.
Furthermore, a limiting groove 115 is formed in the outer peripheral surface of the brake shoe rib plate 11, the limiting groove 115 is used for limiting the alarm spring plate 4, a threaded hole 116 is formed in one side, away from the roller 2, of the side surface of the brake shoe rib plate 11, and the threaded hole 116 is used for fixing the alarm spring plate 4.
Specifically, in order to realize that the alarm dome 4 is mounted on the brake shoe rib plate 11, as shown in fig. 12-14, the alarm dome 4 includes a first fixing portion 41, a second fixing portion 42, a connecting portion 43 and an extending portion 44, the cross sections of the first fixing portion 41 and the second fixing portion 42 are approximately semicircular structures, the first fixing portion 41 and the second fixing portion 42 are respectively symmetrically disposed at two sides of the brake shoe rib plate 11, and two ends of the connecting portion 43 are respectively connected to the first fixing portion 41 and the second fixing portion 42 and abut against the outer circumferential surface of the brake shoe rib plate 11.
Specifically, the connecting bolts 7 are respectively inserted through the first fixing portion 41, the second fixing portion 42, and the threaded holes 116. The distance B between the first fixing portion 41 and the second fixing portion 42 is greater than the distance a between the outer side surfaces of the two brake shoe rib plates 11 (as shown in fig. 13 and 3). Under the matching action of the first fixing part 41, the second fixing part 42 and the connecting part 43, the first fixing part 41, the connecting part 43 and the second fixing part 42 wrap the side face, the outer peripheral face and the side face of one side of the brake shoe rib plate 11 in sequence, and the fixing effect is good.
It will be appreciated that the minimum distance b between the threaded bore 116 and the centre of the shoe axle 60, as shown in figure 15, should be greater than the maximum profile radius a of the brake shoe 50 of the brake drum at this location to avoid the connecting bolt 7 interfering and failing to fit. Because the limiting groove 115 is arranged on the outer peripheral surface of the brake horseshoe rib plate 11, the connecting part 43 is arranged in the limiting groove 115, and the limiting groove 115 plays a role in limiting the connecting part 43. In order to ensure that the connecting part 43 is limited by the limiting groove 115, the minimum distance e from the threaded hole 116 to the limiting groove 115 is 0mm-1mm smaller than the distance d from the center of the threaded hole 116 for installing the alarm spring piece 4 to the lower surface of the connecting part 43.
Further, the extension portion 44 can also be referred to as a free end, the extension portion 44 is disposed on a side of the connecting portion 43 away from the first fixing portion 41, and a tail end of the extension portion 44 needs to ensure a straight line segment D (as shown in fig. 14) of about 1.5mm to 2.5 mm. The extension 44 and the connection 43 are designed with a semicircular transition structure, and the radius R5 of the semicircular transition structure should be increased as much as possible. The end of the extension 44 remote from the connection 43 is located at a predetermined position 01, i.e. a position where it can make mechanical contact with the brake drum, thus providing an alarm.
Further, as shown in fig. 16 to 17, the brake pad assembly 3 includes a first brake pad 31 and a second brake pad 32, the first brake pad 31 is disposed at a lower side of the outer peripheral surface of the brake shoe assembly 1, the second brake pad 32 is disposed at an upper side, and outer sides of the first and second brake pads 31 and 32 can abut against an inner wall of the brake drum. Specifically, the outer surfaces of the first brake friction plate 31 and the second brake friction plate 32 which are arranged up and down still form an arc, and the radius R2 of the inner circular surface of the first brake friction plate 31 is the same as the radius R1 of the outer circular surface of the brake shoe web 12 in the brake shoe assembly 1, so as to ensure that the first brake friction plate 31 and the brake shoe web 12 are tightly attached. Meanwhile, the outer diameter center 02 of the friction plate is not concentric with the brake center 03, so that the first brake friction plate 31 and the second brake friction plate 32 are both eccentrically arranged relative to the center of the brake base plate 50, and the brake friction plate assembly 3 and the working surface of the brake drum are in contact with each other.
Further, the first brake pad 31 and the second brake pad 32 are of a variable cross-section structure, the thickness of the first brake pad 31 in the radial direction of the brake drum is gradually reduced from the roller 2 to the alarm elastic piece 4 (i.e., gradually reduced from the right side to the left side in fig. 16), and the thickness of the second brake pad 32 in the radial direction of the brake drum is gradually reduced from the roller 2 to the alarm elastic piece 4 (i.e., gradually reduced from the right side to the left side in fig. 16). By adopting the mode, the fitting degree of the brake friction plate assembly 3 and the working surface of the brake drum is ensured.
Preferably, the first brake friction plate 31 and the second brake friction plate 32 are both of a split structure, and a certain gap 04 is reserved between the first brake friction plate 31 and the second brake friction plate 32 when the first brake friction plate 31 and the second brake friction plate 32 are mounted to the brake shoe assembly 1, wherein the gap 04 is about 3mm-5 mm. Through setting up this clearance 04, when keeping certain surplus for expend with heat and contract with cold, avoid the brake lining to be whole piece structure when carrying out rivet 6 and connect, the phenomenon of fracture appears easily, and joint strength is good.
It should be particularly noted that the brake shoe mechanism 10 is divided into a leading shoe and a trailing shoe according to the installation position, specifically, since the roller 2 is cooperatively connected with the cam shaft 40, it is defined that the leading shoe is the same as the rotation direction of the roller 2 in the advancing direction of the whole vehicle, and the trailing shoe is the opposite in the advancing direction of the whole vehicle and the rotation direction of the roller 2, and according to the actual situation and design experience, the wear of the leading shoe is generally larger than that of the trailing shoe, so the alarm elastic sheet 4 is preferably only connected to the brake shoe mechanism 10 at the leading shoe position, and the brake shoe mechanism 10 at the trailing shoe position is not provided with the alarm elastic sheet 4. By means of the arrangement, the best alarm effect can be achieved under the condition that the production cost is controlled as far as possible.
In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A brake shoe mechanism, comprising:
a brake shoe assembly (1);
the roller (2) penetrates through the brake shoe component (1) and is fixed on the brake shoe component (1) through an elastic piece (5);
the brake friction plate assembly (3) is arranged on the outer side of the outer peripheral surface of the brake shoe assembly (1), the cam shaft (40) is configured to abut against the roller (2) and push the brake shoe assembly (1) to move through the roller (2), and the outer side of the brake friction plate assembly (3) abuts against the inner wall of the brake drum;
and one end of the alarm elastic sheet (4) is arranged on the side surface of the brake shoe assembly (1), the other end of the alarm elastic sheet is arranged on a preset position (01), and when the brake friction sheet assembly (3) is abraded to the preset position (01), the alarm elastic sheet (4) is configured to abut against the inner wall of the brake drum and generate a sound signal to give an alarm.
2. A brake shoe mechanism according to claim 1, characterized in that the brake shoe assembly (1) comprises:
the side surface of the brake shoe rib plate (11) is respectively provided with the roller (2) and the alarm elastic sheet (4);
and the brake shoe web plate (12) is arranged on the outer peripheral surface of the brake shoe rib plate (11) and is positioned between the brake shoe rib plate (11) and the brake friction plate assembly (3).
3. The brake shoe mechanism according to claim 2, wherein a mounting hole (121) is formed in the brake shoe web (12), a wedge block (111) is arranged on the outer circumferential surface of the brake shoe rib plate (11) corresponding to the mounting hole (121), and the wedge block (111) is clamped in the mounting hole (121).
4. A brake shoe mechanism according to claim 2 or 3, characterized in that a rivet hole (122) is provided in the brake shoe web (12), a rivet (6) being provided through the brake friction plate pack (3) and the rivet hole (122).
5. A brake shoe mechanism according to claim 4, characterized in that said preset position (01) is a position which is greater than a preset distance of 1mm in the radial direction of the brake drum, wherein said preset distance is the maximum distance between the centre of the brake drum and the head of the rivet (6).
6. A brake shoe mechanism according to claim 2, characterized in that said alarm dome (4) comprises:
a first fixing part (41) and a second fixing part (42) which are respectively and symmetrically arranged at two sides of the brake horseshoe rib plate (11),
a connecting part (43) having both ends connected to the first fixing part (41) and the second fixing part (42) and abutting against the outer circumferential surface of the brake shoe rib plate (11);
an extension portion (44) disposed on a side of the connection portion (43) away from the first fixing portion (41), wherein an end of the extension portion (44) away from the connection portion (43) is disposed on the preset position (01).
7. The brake shoe mechanism according to claim 6, wherein a limiting groove (115) is formed in an outer circumferential surface of the brake shoe rib plate (11), the connecting portion (43) is disposed in the limiting groove (115), a threaded hole (116) is formed in a side surface of the brake shoe rib plate (11) and a side surface of the brake shoe rib plate away from the roller (2), and a connecting bolt (7) is respectively inserted into the first fixing portion (41), the second fixing portion (42) and the threaded hole (116).
8. A brake shoe mechanism according to claim 1, characterized in that said brake pad assembly (3) comprises:
the first brake friction plate (31) is arranged on the lower side of the brake shoe assembly (1), and the thickness of the first brake friction plate (31) along the radial direction of the brake drum is gradually reduced from the roller (2) to the alarm elastic sheet (4);
the second brake friction plate (32) is arranged on the upper side of the brake shoe assembly (1), the outer side of the second brake friction plate (32) can abut against the inner wall of a brake drum, and the thickness of the second brake friction plate (32) in the radial direction of the brake drum is gradually reduced from the roller (2) to the alarm elastic sheet (4).
9. A brake apparatus, comprising a brake chamber (20), an adjusting arm (30), a cam shaft (40), a brake drum (50), a shoe shaft (60), and the brake shoe mechanism (10) according to any one of claims 1-8, wherein the brake shoe mechanism (10) is rotatably connected to the brake drum through the shoe shaft (60), the brake chamber (20) is used for converting high-pressure gas of a brake system into thrust, and the brake chamber (20) is configured to push the cam shaft (40) to rotate through the adjusting arm (30), so that the brake shoe mechanism (10) is opened and attached to the brake drum (50).
10. The brake device according to claim 9, further comprising a first reset member (80) and a second reset member (90), wherein the number of the brake shoe mechanisms (10) is two, the two brake shoe mechanisms (10) are symmetrically arranged on two sides of the brake base plate (50), two ends of the first reset member (80) are respectively connected to one side of the two brake shoe mechanisms (10) close to the shoe axle (60), and two ends of the second reset member (90) are respectively connected to one side of the two brake shoe mechanisms (10) far away from the shoe axle (60).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372084.7A CN111536173A (en) | 2020-05-06 | 2020-05-06 | Brake shoe mechanism and brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010372084.7A CN111536173A (en) | 2020-05-06 | 2020-05-06 | Brake shoe mechanism and brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111536173A true CN111536173A (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010372084.7A Pending CN111536173A (en) | 2020-05-06 | 2020-05-06 | Brake shoe mechanism and brake device |
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| Country | Link |
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| CN (1) | CN111536173A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112797093A (en) * | 2021-01-29 | 2021-05-14 | 徐州九阳机械制造有限公司 | Brake drum braking device for engineering truck |
| CN113915253A (en) * | 2021-11-03 | 2022-01-11 | 清华大学 | Drum brake |
| CN115524248A (en) * | 2022-10-28 | 2022-12-27 | 湖南元天检测技术有限公司 | Concrete strength intellectual detection system device |
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| CN105465237A (en) * | 2015-12-20 | 2016-04-06 | 重庆泽田汽车部件有限责任公司 | Drum brake with automatic alarm function |
| CN211259428U (en) * | 2019-10-30 | 2020-08-14 | 一汽解放汽车有限公司 | Brake shoe assembly with abrasion alarm function |
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| GB1513740A (en) * | 1975-12-18 | 1978-06-07 | Automotive Prod Co Ltd | Brake actuating cylinder with autoadjuster |
| EP1255055A1 (en) * | 2001-04-25 | 2002-11-06 | Delphi Technologies, Inc. | Drum brake and wear sensor therefor |
| CN2542883Y (en) * | 2001-06-13 | 2003-04-02 | 李能 | Brake for slide balancing tractor wheel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112797093A (en) * | 2021-01-29 | 2021-05-14 | 徐州九阳机械制造有限公司 | Brake drum braking device for engineering truck |
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| CN115524248B (en) * | 2022-10-28 | 2023-08-04 | 湖南元天检测技术有限公司 | Concrete intensity intelligent detection device |
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