CN110925333B - Drum brake and vehicle braking system - Google Patents
Drum brake and vehicle braking system Download PDFInfo
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- CN110925333B CN110925333B CN201911046366.1A CN201911046366A CN110925333B CN 110925333 B CN110925333 B CN 110925333B CN 201911046366 A CN201911046366 A CN 201911046366A CN 110925333 B CN110925333 B CN 110925333B
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- Prior art keywords
- brake shoe
- brake
- shoe assembly
- camshaft
- assembly
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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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
- F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
- F16D51/24—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots fluid actuated
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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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/18—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes
- F16D51/20—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots
- F16D51/22—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with two brake-shoes extending in opposite directions from their pivots mechanically actuated
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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
- F16D65/02—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
- F16D65/09—Pivots or supporting members therefor
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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
- F16D2121/14—Mechanical
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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 relates to the field of vehicles and discloses a drum brake and a vehicle brake system. The drum brake includes: a brake shoe (1); the brake shoe assembly is mounted on the brake base plate (1) through a brake shoe pin shaft (4), and the diameter of the brake shoe pin shaft (4) is gradually increased along the axial direction; and a first elastic member (5), wherein the first elastic member (5) is arranged to provide a biasing force towards the diameter increasing direction of the brake shoe pin shaft (4) to the brake shoe assembly. The drum brake of the invention pushes the brake shoe assembly to move through the action of the first elastic element so as to automatically compensate the clearance between the brake shoe pin shaft and the brake shoe assembly caused by the abrasion between the brake shoe pin shaft and the brake shoe assembly, and realize zero clearance fit between the brake shoe pin shaft and the brake shoe assembly.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a drum brake and a vehicle brake system.
Background
The brake is an important part on an automobile axle and has a crucial influence on the driving safety, and the consistency of the clearance between a friction plate and a brake drum of a brake shoe assembly has the largest influence on the braking of the automobile.
At present, as shown in fig. 1, an air drum brake is provided, in which an upper brake shoe assembly 2 and a lower brake shoe assembly 3 are mounted on a brake base plate 1 through a brake shoe pin shaft 4 and a set screw 18, inner holes of the upper brake shoe assembly 2 and the lower brake shoe assembly 3 are in interference fit with a brake shoe bush 19, and an inner hole of the brake shoe bush 19 is in clearance fit with the outer diameter of the brake shoe pin shaft 4; return spring 20 connects upper brake shoe assembly 2 to lower brake shoe assembly 3, and wire locking cable 21 prevents set screw 18 from loosening.
The air chamber support assembly 22 is connected and assembled on the brake bottom plate 1, the air chamber assembly 24 is assembled with the air chamber support assembly 22 in a bolt connection mode, the adjusting arm assembly (automatic arm adjusting or manual arm adjusting) 17 is connected with the air chamber assembly 24 and the camshaft 11, a bottom plate bushing 25 and a support bushing 26 are sleeved at two ends of the camshaft 11, the outer diameter of the camshaft 11 is in clearance fit with an inner hole of the bottom plate bushing 25 and an inner hole of the support bushing 26, the outer diameters of the bottom plate bushing 25 and the support bushing 26 are in interference fit with the inner holes of the brake bottom plate 1 and the air chamber support assembly 22, and the force of the air chamber assembly 24 is transmitted to the rotating torque of the camshaft. The friction plate 27 is assembled with the upper brake shoe assembly 2 and the lower brake shoe assembly 3 by riveting with a plurality of rivets.
In the prior art, the camshaft 11 is in clearance fit with the brake base plate 1 and the brake shoe assembly is in clearance fit with the brake shoe pin shaft 4. In addition, abrasion inevitably occurs during the use of the brake, so that the brake shoe lining 19, the bottom plate lining 25 and the bracket lining 26 need to be replaced regularly for subsequent maintenance, which results in higher maintenance cost.
Further, the clearance fit is influenced by gravity, which causes the clearance between the friction plate 27 and the brake drum 23 to be inconsistent, specifically, as shown in fig. 2, the clearance between the friction plate 27 and the brake drum 23 on the upper brake shoe assembly 2 is larger than the clearance between the friction plate 27 and the brake drum 23 on the lower brake shoe assembly 3, which causes the braking torque of the left brake and the right brake of the vehicle to be inconsistent, and the braking of the vehicle is deviated. In the braking process, the friction plate 27 with a small gap and the brake drum 23 generate dragging and rubbing phenomena, so that the tire is ignited due to high braking temperature, and the driving safety is influenced.
In addition, if the clearance between the friction plate 27 and the brake drum 23 is too small (smaller than the design requirement), the automatic adjustment of the adjustment arm assembly is also affected, and the over-adjustment of the adjustment arm assembly is easily caused, so that the braking temperature is higher when the vehicle is braked. Moreover, because the inner hole of the brake shoe bush 19 is in clearance fit with the outer diameter of the brake shoe pin shaft 4, under the action of the return spring 20, a taper is formed on the cylindrical surface where the friction plate 27 of the brake shoe assembly is located, and the gap between the friction plate 27 and the brake drum 23 is also inconsistent, so that the brake drum 23 is not fully contacted with the friction plate 27, the braking torque is unstable, the fluctuation is large, and the braking effect is finally influenced.
Disclosure of Invention
The invention aims to provide a drum brake which can always maintain zero clearance fit between a brake shoe pin shaft and a brake shoe assembly and between a cam shaft and a brake bottom plate, and further effectively prevent the friction phenomenon between a friction plate and a brake drum in the use process of a vehicle in the prior art.
In order to achieve the above object, the present invention provides a drum brake including:
braking the bottom plate;
the brake shoe assembly is arranged on the brake bottom plate through a brake shoe pin shaft, and the diameter of the brake shoe pin shaft is gradually increased along the axial direction; and
a first resilient member configured to provide a biasing force to the brake shoe assembly in a direction toward an increase in the diameter of the brake shoe pin shaft.
Optionally, the brake shoe assembly comprises an upper brake shoe assembly and a lower brake shoe assembly, and the upper brake shoe assembly and the lower brake shoe assembly are respectively mounted on the brake base plate through a brake shoe pin shaft.
Optionally, be equipped with on the backing plate and be used for passing the first hole of brake shoe round pin axle, go up the brake shoe assembly with lower brake shoe assembly includes the installation department respectively, be equipped with on the installation department run through in being used for of installation department passes the second hole of brake shoe round pin axle, the second hole with form conical surface cooperation between the brake shoe round pin axle, first elastic component cover is established on the brake shoe round pin axle, follow in the middle part of the first hole radial direction outwards extends in order to form and is used for holding first elastic component with the chamber that holds of installation department.
Optionally, one end of the first elastic member abuts against the brake shoe assembly, and the other end of the first elastic member abuts against the brake base plate.
Optionally, the brake bottom plate includes a flat plate, the brake shoe assembly is located on one side of the flat plate, the flat plate is provided with a support member extending towards the other side, a mounting hole penetrating through a cam shaft is formed in the support member, an end portion, close to the flat plate, of the cam shaft is arranged to be gradually reduced along the flat plate towards a direction diameter of the other side facing away from the brake shoe assembly, and a second elastic member providing a biasing force towards the direction of reducing the diameter of the cam shaft is arranged in the mounting hole.
Optionally, an adjustment arm assembly is connected to the camshaft.
Optionally, the second elastic member is sleeved on the cam shaft, a stop member is detachably disposed on the cam shaft, one end of the second elastic member abuts against the stop member, and the other end of the second elastic member abuts against the inner wall of the support member.
Optionally, the stop member is sleeved on the cam shaft, and an annular mounting groove extending along the circumferential direction of the cam shaft for clamping the stop member is formed in the cam shaft.
Optionally, the mounting hole at least comprises a cam section and a transition section which are sequentially connected along the axial direction, the cam section is configured to match with the shape of the end of the camshaft, and the transition section is configured to extend outwards along the radial direction of the camshaft so as to accommodate the second elastic piece and the stop piece.
A second aspect of the invention provides a vehicle brake system including a drum brake according to any of the above aspects.
According to the technical scheme, the diameters of the brake shoe pin shafts are sequentially increased along the axial direction, and the first elastic parts which can always provide biasing force towards the direction of increasing the diameters of the brake shoe pin shafts for the brake shoe assemblies are arranged, so that in the service life cycle of the brake, the brake shoe assemblies are pushed to move under the action of the first elastic parts so as to automatically compensate the gaps between the brake shoe pin shafts and the brake shoe assemblies caused by abrasion between the brake shoe pin shafts and the brake shoe assemblies, and zero-gap matching between the brake shoe pin shafts and the brake shoe assemblies is realized.
Furthermore, on the basis of eliminating the clearance, the same clearance between the friction plates of the upper brake shoe assembly and the lower brake shoe assembly and the brake drum can be ensured even under the action of gravity, so that the brake torques of the left brake and the right brake of the vehicle can be ensured to be consistent, and the brake deviation can be prevented. Meanwhile, because the clearance is consistent, overlarge or undersize clearance can not occur, the dragging and friction phenomenon between the friction plate and the brake drum in the use process of the vehicle in the prior art can be effectively prevented, the phenomenon of overhigh temperature of the brake drum in the braking process is further prevented, and the driving safety is ensured.
Even under the action of the return spring, the cylindrical surface where the friction plate is located cannot form taper, so that the brake drum and the friction plate are fully contacted, and the brake torque is stable. Of course, the over-adjustment of the adjustment arm assembly can be prevented. In addition, the drum brake of the invention also omits the arrangement of a lining, can avoid the need of replacing the lining during maintenance in the prior art, and reduces the maintenance cost.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a cross-sectional view of a prior art drum brake;
FIG. 2 is a front view of the drum brake of FIG. 1;
FIG. 3 is a cross-sectional view of a drum brake according to one embodiment of the present invention;
FIG. 4 is a front view of the drum brake of FIG. 3;
FIG. 5 is a schematic view of the construction of a camshaft in the drum brake of FIG. 3;
FIG. 6 is a side view of the camshaft of FIG. 5;
FIG. 7 is a schematic structural view of a brake shoe pin in the drum brake of FIG. 3;
FIG. 8 is a schematic view of a drum brake according to an embodiment of the present invention subjected to an axial force.
Description of the reference numerals
1-brake bottom plate, 2-upper brake shoe assembly, 3-lower brake shoe assembly, 4-brake shoe pin shaft, 5-first elastic element, 6-first inner hole, 7-mounting part, 8-second inner hole, 9-flat plate, 10-supporting part, 11-camshaft, 12-second elastic element, 13-stop part, 14-annular mounting groove, 15-cam section, 16-transition section, 17-adjusting arm assembly, 18-set screw, 19-brake shoe bush, 20-return spring, 21-steel wire locking wire, 22-air chamber support assembly, 23-brake drum, 24-air chamber assembly, 25-bottom plate bush, 26-support bush and 27-friction plate.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
With reference to fig. 3-8, according to one aspect of the present invention, there is provided a drum brake comprising:
a brake shoe 1;
the brake shoe assembly is arranged on the brake bottom plate 1 through a brake shoe pin shaft 4, and the diameter of the brake shoe pin shaft 4 is gradually increased along the axial direction; and
a first resilient member 5, said first resilient member 5 being arranged to provide a biasing force to said brake shoe assembly in a direction towards an increase in the diameter of said brake shoe pin 4.
According to the technical scheme, the diameters of the brake shoe pin shafts are sequentially increased along the axial direction, and the first elastic parts which can always provide biasing force towards the direction of increasing the diameters of the brake shoe pin shafts for the brake shoe assemblies are arranged, so that in the service life cycle of the brake, the brake shoe assemblies are pushed to move under the action of the first elastic parts so as to automatically compensate the gaps between the brake shoe pin shafts and the brake shoe assemblies caused by abrasion between the brake shoe pin shafts and the brake shoe assemblies, and zero-gap matching between the brake shoe pin shafts and the brake shoe assemblies is realized.
Furthermore, on the basis of eliminating the clearance, the same clearance between the friction plates of the upper brake shoe assembly and the lower brake shoe assembly and the brake drum can be ensured even under the action of gravity, so that the brake torques of the left brake and the right brake of the vehicle can be ensured to be consistent, and the brake deviation can be prevented. Meanwhile, because the clearance is consistent, overlarge or undersize clearance can not occur, the dragging and friction phenomenon between the friction plate and the brake drum in the use process of the vehicle in the prior art can be effectively prevented, the phenomenon of overhigh temperature of the brake drum in the braking process is further prevented, and the driving safety is ensured.
Even under the action of the return spring, the cylindrical surface where the friction plate is located cannot form taper, so that the brake drum and the friction plate are fully contacted, and the brake torque is stable. Of course, the over-adjustment of the adjustment arm assembly can be prevented. In addition, the drum brake of the invention also omits the arrangement of a lining, can avoid the need of replacing the lining during maintenance in the prior art, and reduces the maintenance cost.
Generally, the brake shoe assembly includes an upper brake shoe assembly 2 and a lower brake shoe assembly 3, and the upper brake shoe assembly 2 and the lower brake shoe assembly 3 are respectively mounted on the backing plate 1 by a brake shoe pin 4.
For realizing the above-mentioned connection, in this embodiment, be equipped with on backing plate 1 and be used for passing brake shoe round pin axle 4's first hole 6, go up brake shoe assembly 2 with brake shoe assembly 3 includes installation department 7 respectively down, be equipped with on installation department 7 run through in installation department 7 be used for passing brake shoe round pin axle 4's second hole 8, second hole 8 with form conical surface cooperation between brake shoe round pin axle 4, 5 covers of first elastic component are established on brake shoe round pin axle 4, 6 middle parts of first hole are followed the outside extension of 6 radial directions in first hole is used for holding in order to form first elastic component 5 with installation department 7 hold the chamber.
Further, the end portion of the brake bottom plate 1 is provided with plates arranged in parallel, two pairs of through holes are correspondingly formed in the plates, a space between each pair of through holes and each pair of plates forms one first inner hole 6, the tops of the plates are connected through a connecting plate, the bottoms of the plates are in an open state, a common brake shoe assembly is of an arc-shaped structure, the end portion of the arc-shaped structure is provided with an installation portion 7, in the installation process of the brake shoe assembly, the installation portion 7 extends into the first inner hole 6 from the bottom of each plate, then the second inner hole 8 corresponds to the first inner hole 6, and the brake shoe pin shaft 4 penetrates through the first inner hole 6 and the second inner hole 8, so that the brake shoe assembly is installed on the brake bottom. The upper brake shoe assembly 2 and the lower brake shoe assembly 3 are mounted on the brake spider 1 in the manner described above.
Wherein, in order to ensure zero clearance fit between the brake shoe pin shaft 4 and the brake shoe assembly, the diameter of the brake shoe pin shaft 4 is gradually increased along the axial direction, preferably, the second inner hole 8 is matched with the brake shoe pin shaft 4 to form a conical surface, and as the braking process is carried out, the brake shoe pin shaft 4 and the brake shoe assembly are continuously abraded, so that a clearance is generated between the brake shoe pin shaft 4 and the brake shoe assembly, because the friction plate 27 is arranged on the brake shoe assembly, the brake shoe assembly and the friction plate 27 are both arranged in the brake drum 23, and the friction plate 27 and the brake drum 23 are arranged at intervals, therefore, if the clearance generated by abrasion is not timely compensated, the clearance between the friction plate of the upper brake shoe assembly and the friction plate of the lower brake shoe assembly and the brake drum is unequal, dragging friction phenomenon is easily generated between the friction plate 27 and the brake drum 23, and accordingly, the phenomenon that the temperature of the brake drum, influencing traffic safety. In the embodiment, the first elastic part 5 is arranged, and the first elastic part 5 is in an extrusion state after being installed, so that biasing force towards the diameter increasing direction of the brake shoe pin shaft 4 can be provided for the brake shoe assembly, and when a gap appears after abrasion, the first elastic part 5 can push the brake shoe assembly to move towards the diameter increasing direction, so that the second inner hole 8 of the brake shoe assembly is contacted with the brake shoe pin shaft 4 again, the gap is eliminated, zero-gap fit between the brake shoe assembly and the brake shoe pin shaft 4 is always ensured, and the problem is solved. It will be appreciated that a first resilient member 5 is disposed within each of the second inner bores 8 of the upper and lower brake shoe assemblies 2 and 3, respectively, to accommodate engagement between the upper and lower brake shoe assemblies 2 and 3, respectively, and the respective brake shoe pin 4.
It should be noted that, in order to meet the above requirement, the first elastic element 5 may adopt a spring or other elastic component, further, the first elastic element 5 is sleeved on the brake shoe pin shaft 4, one end of the first elastic element 5 abuts against the brake shoe assembly, and the other end of the first elastic element 5 abuts against the brake base plate 1. In the installation, stretch into first hole 6 with the installation department 7 of first elastic component 5 and brake shoe assembly from the plate bottom, let first elastic component 5 one end butt in installation department 7, the other end butt in braking bottom plate 1, correspond second hole 8 and first hole 6 equally, utilize brake shoe round pin axle 4 to pass first hole 6 and second hole 8, from this, satisfy in the use first elastic component 5 can be right the brake shoe assembly provides the orientation the requirement of the biasing force of 4 diameter increase directions of brake shoe round pin axle. Of course, the first elastic member 5 may be provided at one side of the brake shoe assembly to apply the above-mentioned biasing force to the brake shoe assembly.
It should be noted that the brake bottom plate 1 includes a flat plate 9, the brake shoe assembly is located on one side of the flat plate 9, the flat plate 9 is provided with a support member 10 extending towards the other side, and a mounting hole penetrating through a camshaft 11 is formed inside the support member 10.
In order to further compensate the clearance and solve the problems of friction, over-high temperature of the brake drum, over-adjustment of the adjusting arm assembly and the like caused by the clearance, the end part of the camshaft 11 close to the flat plate 9 is arranged to be gradually reduced in diameter along the other side of the flat plate 9 towards the direction departing from the brake shoe assembly, and a second elastic part 12 for providing a biasing force to the camshaft 11 towards the diameter reduction direction of the camshaft 11 is arranged in the mounting hole.
It is understood that the shape of the mounting hole is configured to be adapted to the camshaft 11, and thus, when there is a gap between the camshaft 11 and the mounting hole, the second elastic member 12 provides the camshaft 11 with a biasing force in a direction of decreasing the diameter of the camshaft 11, so that the gap generated by the large diameter portion of the camshaft 11 is compensated, and the camshaft 11 and the mounting hole are ensured to be in a close fit state, and a zero-gap fit therebetween is achieved.
In the present embodiment, the direction of the axial force provided by the first elastic element 5 and the second elastic element 12, i.e. the direction of the biasing force, is shown in fig. 8, and it can be seen that the design of the camshaft 11 and the brake shoe pin 4, in cooperation with the use of the first elastic element 5 and the second elastic element 12, can solve the problem of the clearance generated during the use of the drum brake.
In addition, an adjusting arm assembly 17 is connected to the camshaft 11, and the adjusting arm assembly 17 automatically adjusts the camshaft 11 in the use process, so as to ensure accurate adjustment, it is required to ensure that the gaps between the friction plates 27 of the upper brake shoe assembly 2 and the lower brake shoe assembly 3 and the brake drum 23 are equal, that is, when the gaps between the two are uneven, the gap between one side is too large, and the gap between the other side is too small, the adjusting arm assembly may overshoot, and thus, when a vehicle brakes, the braking temperature is too high. In the present embodiment, zero clearance fit between the brake shoe assembly and the brake shoe pin 4 and zero clearance fit between the camshaft 11 and the mounting hole are achieved, so that the gap between the friction plate 27 and the brake drum 23 is prevented from being unequal due to the influence of gravity after the gap occurs, that is, in the present embodiment, the gaps between the friction plate 27 and the brake drum 23 of the upper brake shoe assembly 2 and the lower brake shoe assembly 3 can be further ensured to be equal, and thus the normal adjustment operation of the adjustment arm assembly 17 is maintained.
As an embodiment, the second elastic member 12 is sleeved on the camshaft 11, a stop member 13 is detachably disposed on the camshaft 11, one end of the second elastic member 12 abuts against the stop member 13, and the other end of the second elastic member 12 abuts against the inner wall of the support member 10, so that the second elastic member 12 can provide a biasing force to the camshaft 11 in a direction toward the diameter of the camshaft 11.
The stop element 13 is fixedly disposed on the camshaft 11, which is equivalent to the second elastic element 12 applying an acting force to the camshaft 11, but the stop element 13 may be disposed on the camshaft 11 by any suitable method, such as welding. Considering easy dismounting's purpose, stop part 13 cover is established on camshaft 11, be equipped with on camshaft 11 along camshaft 11 circumference extends with the joint annular mounting groove 14 of stop part 13, as shown in fig. 5. Specifically, the stop part 13 may be a circlip, and the stop part 13 is sleeved on the camshaft 11 and then clamped in the annular mounting groove 14, so as to position the stop part 13, thereby playing a role in stably limiting the second elastic part 12.
In the present embodiment, the mounting hole at least includes a cam section 15 and a transition section 16 connected in sequence along the axial direction, the cam section 15 is configured to match with the end shape of the camshaft 11, and the transition section 16 is configured to extend outward along the radial direction of the camshaft 11 to accommodate the second elastic member 12 and the stop member 13. The cam section 15 is directly connected with the flat plate 9, and in the braking process, the section is most easily worn and further easily has a gap with the cam shaft 11, so that the cam section 15 and the part of the cam shaft 11 matched with the cam section 15 are gradually reduced in diameter along the direction departing from the brake shoe assembly, specifically, the cam shaft 11 and the cam section 15 can be in conical surface fit, and therefore, zero gap fit between the cam section 15 and the cam shaft 11 can be achieved under the biasing force action of the second elastic part 12. It will be appreciated that, in order to facilitate the installation of the second elastic element 12, the inner wall of the installation hole is formed with an end face capable of stopping the second elastic element 12 at the junction of the cam section 15 and the transition section 16.
A second aspect of the invention provides a vehicle brake system including a drum brake according to any of the above aspects. The vehicle braking system has all the advantages of the drum brake by adopting the drum brake, and the zero clearance fit between the brake shoe assembly and the brake shoe pin shaft 4 and the zero clearance fit between the cam shaft 11 and the brake bottom plate 1 can ensure that the clearances between the friction plates of the upper brake shoe assembly and the lower brake shoe assembly and the brake drum are equal even under the action of gravity, so that the braking moments of the left brake and the right brake of the vehicle are consistent, and the braking deviation can be prevented. Meanwhile, because the clearance between the friction plate and the brake drum is consistent, the clearance which is too large or too small cannot occur, the dragging and friction phenomenon between the friction plate and the brake drum in the use process of the vehicle in the prior art can be effectively prevented, the phenomenon that the temperature of the brake drum is too high in the braking process is further prevented, and the driving safety is ensured.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A drum brake, comprising:
a brake shoe (1);
the brake shoe assembly is mounted on the brake base plate (1) through a brake shoe pin shaft (4), and the diameter of the brake shoe pin shaft (4) is gradually increased along the axial direction; and
a first resilient member (5), said first resilient member (5) being arranged to provide a biasing force to said brake shoe assembly in a direction towards an increase in the diameter of said brake shoe pin (4);
the brake shoe assembly comprises an upper brake shoe assembly (2) and a lower brake shoe assembly (3), wherein the upper brake shoe assembly (2) and the lower brake shoe assembly (3) are respectively installed on the brake base plate (1) through brake shoe pin shafts (4)
Wherein, be equipped with on backing plate (1) and be used for passing first hole (6) of brake shoe round pin axle (4), go up brake shoe assembly (2) with brake shoe assembly (3) include installation department (7) respectively down, be equipped with on installation department (7) run through in being used for of installation department (7) passes second hole (8) of brake shoe round pin axle (4), second hole (8) with form conical surface cooperation between brake shoe round pin axle (4), first elastic component (5) cover is established on brake shoe round pin axle (4), first hole (6) middle part is followed first hole (6) radial direction outwards extends in order to form and is used for holding first elastic component (5) with the chamber that holds of installation department (7).
2. A drum brake according to claim 1, in which one end of said first resilient member (5) abuts against said brake shoe assembly and the other end of said first resilient member (5) abuts against said backing plate (1).
3. A drum brake according to claim 1, in which said brake spider (1) comprises a flat plate (9), said brake shoe assembly being located on one side of said flat plate (9), said flat plate (9) being provided with a support (10) extending towards the other side, said support (10) being internally provided with a mounting hole through which a camshaft (11) is inserted, the end of said camshaft (11) close to said flat plate (9) being arranged with a diameter decreasing towards the direction away from said brake shoe assembly along said other side of said flat plate (9), said mounting hole being internally provided with a second resilient member (12) providing said camshaft (11) with a biasing force in the direction of decreasing diameter of said camshaft (11).
4. A drum brake according to claim 3, in which an adjustment arm assembly (17) is connected to the cam shaft (11).
5. A drum brake according to claim 3, characterized in that said second elastic element (12) is fitted around said camshaft (11), said camshaft (11) being removably provided with a stop element (13), one end of said second elastic element (12) abutting against said stop element (13), the other end of said second elastic element (12) abutting against the inner wall of said support element (10).
6. A drum brake according to claim 5, in which said stop member (13) is fitted over said cam shaft (11), said cam shaft (11) being provided with an annular mounting groove (14) extending circumferentially along said cam shaft (11) for snap-fitting said stop member (13).
7. A drum brake according to claim 5, in which the mounting hole comprises at least a cam section (15) and a transition section (16) which are connected in series in the axial direction, the cam section (15) being arranged to form fit with an end of the camshaft (11), the transition section (16) being arranged to extend outwards in the radial direction of the camshaft (11) to accommodate the second resilient member (12) and the stop member (13).
8. A vehicle brake system comprising a drum brake according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911046366.1A CN110925333B (en) | 2019-10-30 | 2019-10-30 | Drum brake and vehicle braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911046366.1A CN110925333B (en) | 2019-10-30 | 2019-10-30 | Drum brake and vehicle braking system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110925333A CN110925333A (en) | 2020-03-27 |
| CN110925333B true CN110925333B (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911046366.1A Active CN110925333B (en) | 2019-10-30 | 2019-10-30 | Drum brake and vehicle braking system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110925333B (en) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1585757A (en) * | 1978-02-28 | 1981-03-11 | Automotive Prod Co Ltd | Internal shoe drum brakes |
| KR19990016156U (en) * | 1997-10-22 | 1999-05-15 | 이관기 | Shoe Holder Pin for Automobile Drum Brake |
| CN201053462Y (en) * | 2007-06-01 | 2008-04-30 | 美驰华阳汽车制动器有限公司 | Automobile drum type brake |
| JP2009168177A (en) * | 2008-01-17 | 2009-07-30 | Nisshinbo Holdings Inc | Shoe-hold apparatus for drum brake |
| CN102954080A (en) * | 2011-08-26 | 2013-03-06 | 苏州市烨铭塑胶制品厂 | Taper pin |
| CN202326593U (en) * | 2011-11-23 | 2012-07-11 | 重庆大江美利信压铸有限责任公司 | Floating diamond positioning pin for machining |
| CN202790242U (en) * | 2012-08-25 | 2013-03-13 | 湖南运达机械制造有限公司 | Automobile cam drum-type brake suitable for muddy environment |
| CN105782200A (en) * | 2014-12-24 | 2016-07-20 | 芜湖东大汽车工业有限公司 | Water pump body machining dowel pin structure |
| CN205371408U (en) * | 2015-12-18 | 2016-07-06 | 重庆泽田汽车部件有限责任公司 | Drum brake's braking clearance adjustment structure |
| CN205371215U (en) * | 2015-12-18 | 2016-07-06 | 中国石油天然气股份有限公司 | Semi-fastening early warning type horse head pin |
| CN206487737U (en) * | 2017-01-19 | 2017-09-12 | 洛阳Lyc轴承有限公司 | A kind of locking circular cone latch structure |
| CN207728688U (en) * | 2017-12-29 | 2018-08-14 | 上海久浩机械有限公司 | A kind of flexibly positioned taper bolt |
-
2019
- 2019-10-30 CN CN201911046366.1A patent/CN110925333B/en active Active
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