CN118224207A - Drum brake, vehicle, and control method for vehicle - Google Patents

Abstract

The application provides a drum brake, a vehicle and a control method of the vehicle, and relates to the technical field of automobile brake systems, wherein the drum brake comprises: the brake comprises a brake drum, a brake bottom plate assembly, a first collar shoe assembly, a second collar shoe assembly, a transmission assembly and an electronic parking execution assembly, wherein the first collar shoe assembly and the second collar shoe assembly have initial positions far away from the brake drum, and the first collar shoe assembly and the second collar shoe assembly have parking positions matched with the brake drum; the electronic parking execution assembly comprises a power part, a speed reducing mechanism and a stay wire, wherein the power part drives the stay wire to pull the transmission assembly, and then drives the first collar-shoe assembly and the second collar-shoe assembly to move to a parking position.

Description

Drum brake, vehicle, and control method for vehicle

Technical Field

The application relates to the technical field of automobile brake systems, in particular to a drum brake, a vehicle and a control method of the vehicle.

Background

The automobile braking system is closely related to automobile driving safety. Currently, a brake type having an electronic parking function applied to a light truck is mainly a caliper EPB (vehicle electronic parking system), a cable EPB. The caliper type EPB integrates an electronic parking actuating mechanism into the disc brake and generally acts on the rear wheel brake, so that the EPB scheme has relatively high cost, and the disc brake structure has low parking efficiency, so that the high-efficiency requirement of the light truck is difficult to meet. The technical scheme of stay wire EPB is generally based on a central drum type parking brake system, and the traditional scheme of stay wire is driven by a motor to replace a handle to drive the stay wire.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The application mainly aims to provide a drum brake, a vehicle and a control method of the vehicle, so as to solve the problem that the drum brake of a light truck in the prior art does not meet the parking requirement.

In order to achieve the above object, according to one aspect of the present application, there is provided a drum brake comprising: a brake drum; the brake bottom plate assembly is arranged in the brake drum; the first collar shoe assembly is connected with the brake bottom plate assembly; the second collar shoe assembly is connected with the brake bottom plate assembly and is connected with the first collar shoe assembly; the first and second collar-shoe assemblies have an initial position away from the brake drum, and have a park position for engagement with the brake drum; the transmission assembly is arranged between the first collar-shoe assembly and the second collar-shoe assembly, and is movably arranged relative to the first collar-shoe assembly and the second collar-shoe assembly; the electronic parking execution assembly is connected with the brake bottom plate assembly and comprises a power part, a speed reducing mechanism and a stay wire, an output shaft of the power part is connected with an input end of the speed reducing mechanism, and an output end of the speed reducing mechanism is connected with the transmission assembly through the stay wire; the power part drives the stay wire to pull the transmission assembly, and then drives the first collar-shoe assembly and the second collar-shoe assembly to move to the parking position.

Further, the first collar-shoe assembly comprises: the first collar shoe is connected with the brake bottom plate assembly; and one end of the first return spring is connected with the brake bottom plate assembly, and the other end of the first return spring is connected with the first collar shoe.

Further, the second collar-shoe assembly comprises: the second collar shoe is connected with the brake bottom plate assembly and is connected with the first collar shoe; one end of the second return spring is connected with the brake bottom plate assembly, and the other end of the second return spring is connected with the second collar shoe; the first collar shoe and the second collar shoe are provided with an initial position and a parking position.

Further, the brake shoe assembly includes: the electronic parking execution assembly is connected with the brake bottom plate; the support pin is connected with the brake bottom plate, and the first collar shoe, the first return spring, the second collar shoe and the second return spring are all connected with the support pin.

Further, the electronic parking performing assembly includes: the output end of the speed reducing mechanism is connected with the stay wire through the screw, and the surface of the screw is provided with threads.

Further, the speed reducing mechanism includes: the worm is connected with the output shaft of the power part; a worm wheel engaged with the worm; the worm wheel is provided with a shaft hole, and the surface of the shaft hole is provided with internal threads matched with the screw rod.

Further, the transmission assembly includes a first transmission assembly, the first transmission assembly including: the transmission arm is connected with the stay wire and connected with the first collar shoe; the transmission rod is arranged adjacent to the transmission arm; the clamping spring is connected with the first collar shoe through the clamping spring; the second transmission assembly is arranged adjacent to the clamping spring, and two ends of the second transmission assembly are respectively abutted with the first collar shoe and the second collar shoe; the power part drives the stay wire to drive the transmission arm to rotate, so that the transmission rod is pushed to drive the first collar shoe and the second collar shoe to move to the parking position.

Further, the transmission assembly includes a second transmission assembly, the second transmission assembly including: the first push rod, one end of the first push rod is adjacent to the first collar shoe; one end of the third connecting piece is connected with the other end of the first push rod, and a ratchet wheel is arranged along the circumferential direction of the third connecting piece; and one end of the second push rod is adjacently arranged with the second collar shoe, and the other end of the second push rod is connected with the other end of the third connecting piece through threads.

Further, the drum brake includes: the first end of the adjusting component is connected with the supporting pin, the second end of the adjusting component is connected with the first collar shoe, and the third end of the adjusting component is meshed with the ratchet wheel.

Further, the adjusting assembly includes: the tooth pulling plate is connected with the first collar shoe and meshed with the ratchet wheel; one end of the tooth plate push rod is connected with the supporting pin, and the other end of the tooth plate push rod is connected with the first collar; and the tooth plate shifting spring is arranged along the circumferential direction of the tooth plate shifting ejector rod.

Further, the drum brake includes: the wheel cylinder assembly is connected with the brake bottom plate and comprises a wheel cylinder, a piston and a push rod; the wheel cylinder is connected with the first collar hoof through the piston and the push rod, and the wheel cylinder is connected with the second collar hoof through the piston and the push rod.

According to another aspect of the present application there is provided a vehicle comprising a drum brake, the drum brake being as described above.

According to another aspect of the present application, there is provided a control method of a vehicle, including: acquiring working condition information, working state and parking request information of a target vehicle, wherein the working condition information at least comprises: fault information and normal operation information, and the working state at least comprises one of the following: the parking request information comprises at least one of the following information: requesting parking and requesting release of parking; under the condition that the working condition information, the working state and the parking request information meet preset conditions, controlling the target assembly to execute target actions until the working state of the target vehicle is the target working state; wherein the target component comprises at least one of: the brake drum, the first collar-shoe assembly, the second collar-shoe assembly, the transmission assembly and the electronic parking execution assembly.

Further, under the condition that the working condition information, the working state and the parking request information meet the preset conditions, controlling the target component to execute the target action until the working state of the target vehicle is the target working state, including: and under the condition that the working condition information is normal operation information, the working condition is in a non-parking state, and the parking request information is in a parking request condition, controlling the electronic parking execution assembly to drive the transmission assembly, and further driving the first collar and the second collar to move to the parking position until the working condition of the target vehicle is switched to the parking state.

Further, under the condition that the working condition information, the working state and the parking request information meet the preset conditions, controlling the target component to execute the target action until the working state of the target vehicle is the target working state, including: and under the condition that the working condition information is normal operation information and the working condition is parking, and the parking request information is parking release, controlling the electronic parking execution assembly to drive the transmission assembly so as to drive the first collar and the second collar to move to the initial position until the working condition of the target vehicle is switched to the non-parking condition.

By applying the technical scheme of the application, the transmission assembly and the electronic parking execution assembly are additionally arranged on the drum brake, the electronic parking execution assembly comprises the power part, the speed reducing mechanism and the stay wire, the power part drives the stay wire to pull the transmission assembly, and then the first collar shoe assembly and the second collar shoe assembly are driven to move to the parking position, the first collar shoe assembly and the second collar shoe assembly move along with the brake drum, and the reaction force of the transmission assembly on the first collar shoe assembly and the second collar shoe assembly increases the braking pressure of the first collar shoe assembly and the second collar shoe assembly.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

Fig. 1 shows a schematic structural view of a first embodiment of a drum brake according to the present application;

Fig. 2 shows a schematic structural view of a second embodiment of a drum brake according to the present application;

Fig. 3 shows a schematic structural view of a first embodiment of an electronic parking actuation assembly according to the application;

fig. 4 shows a schematic structural view of a second embodiment of an electronic parking actuation assembly according to the application;

Fig. 5 shows a schematic structural view of a third embodiment of an electronic parking actuation assembly according to the application;

fig. 6 shows a schematic structural view of a third embodiment of a drum brake according to the present application;

fig. 7 shows a schematic structural view of an embodiment of a second transmission assembly according to the application.

Wherein the above figures include the following reference numerals:

10. a first collar-foot assembly; 11. a first collar; 12. a first return spring;

20. a second collar-foot assembly; 21. a second collar; 22. a second return spring;

30. A transmission assembly;

31. A first transmission assembly;

311. A transmission arm; 3111. a first connector; 3112. a second connector;

312. A transmission rod;

313. A clamping spring;

32. A second transmission assembly;

321. A first push rod;

322. a third connecting member; 3221. a ratchet wheel;

323. A second push rod;

40. an electronic parking execution assembly;

41. A pull wire;

42. a power section;

43. a speed reducing mechanism; 431. a worm; 432. a worm wheel;

44. A screw;

50. an adjustment assembly; 51. a tooth pulling plate; 52. a tooth plate spring; 53. a tooth plate push rod;

60. A wheel cylinder assembly;

70. A brake shoe assembly; 71. a brake pad; 72. and a support pin.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

In a specific embodiment of the present application, as shown in connection with fig. 1-7, a drum brake is provided.

Specifically, the drum brake comprises a brake drum, a brake bottom plate assembly 70, a first collar-shoe assembly 10, a second collar-shoe assembly 20, a transmission assembly 30, an electronic parking execution assembly 40, wherein the brake bottom plate assembly 70 is arranged in the brake drum, and the first collar-shoe assembly 10 is connected with the brake bottom plate assembly 70; the second collar assembly 20 is connected to the brake sole plate assembly 70, the second collar assembly 20 being connected to the first collar assembly 10; the first and second collar-shoe assemblies 10, 20 have an initial position away from the brake drum, and the first and second collar-shoe assemblies 10, 20 have a park position with the brake drum; the transmission assembly 30 is arranged between the first collar-shoe assembly 10 and the second collar-shoe assembly 20, and the transmission assembly 30 is movably arranged relative to the first collar-shoe assembly 10 and the second collar-shoe assembly 20; the electronic parking execution assembly 40 is connected with the brake bottom plate assembly 70, the electronic parking execution assembly 40 comprises a power part 42, a speed reducing mechanism 43 and a stay wire 41, an output shaft of the power part 42 is connected with an input end of the speed reducing mechanism 43, and an output end of the speed reducing mechanism 43 is connected with the transmission assembly 30 through the stay wire 41; the power portion 42 drives the pull wire 41 to pull the transmission assembly 30, and further drives the first collar-shoe assembly 10 and the second collar-shoe assembly 20 to move to the parking position.

As shown in connection with fig. 1,2 and 5, the drum brake includes a brake drum, a brake spider assembly 70; the first collar shoe assembly 10, the second collar shoe assembly 20, the transmission assembly 30, the electronic parking execution assembly 40 and the brake bottom plate assembly 70 are arranged in the brake drum, the first collar shoe assembly 10 and the second collar shoe assembly 20 are provided with initial positions far away from the brake bottom plate assembly 70, the first collar shoe assembly 10 and the second collar shoe assembly 20 are provided with parking positions matched with the brake drum, the electronic parking execution assembly 40 is connected with the brake drum through a bracket, the transmission assembly 30 is pulled by driving the stay wire 41 through the power part 42 of the electronic parking execution assembly 40, the first collar shoe assembly 10 and the second collar shoe assembly 20 are driven to move to the parking positions, and in the parking braking process, the transmission assembly 30 has reaction force on the first collar shoe assembly 10 and the second collar shoe assembly 20, so that the braking pressure during parking is enhanced. The parking system capable of being independently arranged in the light truck can be reduced, the parking stability is enhanced while the production cost is saved, the requirement of using the drum brake of the light truck for parking is met, and the problems of high cost, complex system structure and large number of parts of the existing electronic parking scheme are solved.

By applying the technical scheme of the application, the transmission assembly 30 and the electronic parking execution assembly 40 are additionally arranged on the drum brake, the electronic parking execution assembly 40 comprises the power part 42, the speed reducing mechanism 43 and the stay wire 41, the stay wire 41 is driven by the power part 42 to pull the transmission assembly 30, and then the first collar shoe assembly 10 and the second collar shoe assembly 20 are driven to move to the parking position, the first collar shoe assembly 10 and the second collar shoe assembly 20 move along with the brake drum, and at the moment, the reaction force of the transmission assembly 30 to the first collar shoe assembly 10 and the second collar shoe assembly 20 increases the braking pressure of the first collar shoe assembly 10 and the second collar shoe assembly 20.

Further, the first collar-shoe assembly 10 comprises a first collar-shoe 11 and a first return spring 12, the first collar-shoe 11 being connected to the brake shoe assembly 70; one end of the first return spring 12 is connected to the brake shoe assembly 70, and the other end of the first return spring 12 is connected to the first collar shoe 11.

Referring to fig. 1, the first collar-shoe assembly 10 includes a first collar-shoe 11 and a first return spring 12, when parking, the first collar-shoe 11 contacts with the brake pad assembly 70, and when parking is released, the first return spring 12 drives the first collar-shoe 11 to move to an initial position far away from the brake pad assembly 70, so that the first collar-shoe 11 can return to the initial position in time, and the practicability of the drum brake is improved.

Further, the second collar-shoe assembly 20 includes a second collar-shoe 21 and a second return spring 22, the second collar-shoe 21 being connected to the brake pad assembly 70, the second collar-shoe 21 being connected to the first collar-shoe 11; one end of the second return spring 22 is connected with the brake bottom plate assembly 70, and the other end of the second return spring 22 is connected with the second collar shoe 21; wherein the first and second collar shoes 11, 21 have the initial position and the parking position.

Referring to fig. 1, the second collar-shoe assembly 20 includes a second collar-shoe 21 and a second return spring 22, and the first collar-shoe 11 and the second collar-shoe 21 are in contact with the brake drum when parking, improving parking stability. When the parking is released, the second return spring 22 drives the second collar shoe 21 to move to an initial position far away from the brake drum, and the second collar shoe 21 can timely return to the initial position, so that the practicability of the drum brake is improved.

Further, the brake pad assembly 70 includes a brake pad 71 and a support pin 72, and the electronic parking actuation assembly 40 is connected to the brake pad 71; the support pin 72 is connected to the brake bottom plate 71, and the first collar shoe 11, the first return spring 12, the second collar shoe 21, and the second return spring 22 are connected to the support pin 72.

As shown in fig. 1 and 2, the brake bottom plate assembly 70 includes a brake bottom plate 71 and a supporting pin 72, the electronic parking execution assembly 40 is connected with the brake bottom plate 71, the power portion 42 of the electronic parking execution assembly 40 drives the stay wire 41 to pull the transmission assembly 30, and then drives the first collar shoe 11 and the second collar shoe 21 to move to the parking position, and electronic parking is realized through the drum brake, so that the problems of high cost, complex system structure and large number of parts of the existing electronic parking scheme are solved, and the lightweight of the parking system is realized.

Further, the electronic parking executing assembly 40 includes a screw 44, an output end of the speed reducing mechanism 43 is connected with the stay wire 41 through the screw 44, and a thread is provided on a surface of the screw 44.

Referring to fig. 3 to 5, in this embodiment, the electronic parking executing assembly 40 includes a pull wire 41, a power portion 42, a speed reducing mechanism 43 and a screw 44, an output shaft of the power portion 42 is connected with an input end of the speed reducing mechanism 43, an output end of the speed reducing mechanism 43 is connected with one end of the screw 44, the other end of the screw 44 is connected with a pull wire connector through a screw connecting pin, the pull wire connector is connected with the pull wire 41 through press fitting, and the other end of the pull wire 41 is connected with the transmission assembly 30, so as to further realize power transmission of electronic parking, so as to drive the first collar shoe 11 and the second collar shoe 21 to move to a parking position matched with a brake drum.

Further, the speed reduction mechanism 43 includes a worm 431 and a worm wheel 432, the worm 431 being connected to the output shaft of the power section 42; the worm wheel 432 is meshed with the worm 431; the worm wheel 432 has a shaft hole, and the surface of the shaft hole is provided with an internal thread which is matched with the screw 44.

In this embodiment, as shown in fig. 4, the speed reducing mechanism 43 includes a worm 431 and a worm wheel 432, the worm wheel 432 has a shaft hole, and the surface of the shaft hole is provided with an internal thread matched with the screw 44, so that the shaft hole of the worm wheel 432 and the inner core of the screw 44 are arranged, and thus the speed change of the power output by the output shaft of the power part 42 is realized, so that the power finally transmitted to the transmission assembly 30 meets the requirements in different scenes, and the practicability of the drum brake is improved.

Further, the transmission assembly 30 includes a first transmission assembly 31, the first transmission assembly 31 includes a transmission arm 311, a transmission rod 312, a clamping spring 313, and a second transmission assembly 32, and the transmission arm 311 is connected to the pull wire 41; the transmission lever 312 is disposed adjacent to the transmission arm 311; the first collar-shoe 11 is connected to the second collar-shoe 21 by means of a clamping spring 313; the second transmission assembly 32 is arranged adjacent to the clamping spring 313, and two ends of the second transmission assembly 32 are respectively abutted with the first collar shoe 11 and the second collar shoe 21; the power portion 42 drives the pull wire 41 to drive the transmission arm 311 to rotate, so as to push the transmission rod 312 to drive the first collar shoe 11 and the second collar shoe 21 to move to the parking position.

As shown in connection with fig. 1 and 6, in the present embodiment, the transmission assembly 30 includes a first transmission assembly 31, and the first transmission assembly 31 includes a transmission arm 311, a transmission rod 312, a clamping spring 313, and a second transmission assembly 32, and the transmission arm 311 is connected to the first collar 11 through a first connector 3111 and a second connector 3112, wherein the first connector 3111 may be a locking tab and the second connector 3112 may be a connecting pin in a preferred embodiment of the present application. Wherein, in another preferred embodiment of the present application, the first connector 3111 may be a nut and the second connector 3112 may be a bolt. The power part 42 drives the stay wire 41 to drive the transmission arm 311 to rotate, so as to push the transmission rod 312 to drive the first collar shoe 11 and the second collar shoe 21 to move to the parking position. The first collar shoe 11 is connected with the second collar shoe 21 through the clamping spring 313, and the second transmission assembly 32 is disposed adjacent to the clamping spring 313 so that the first collar shoe 11 and the second collar shoe 21 are abutted against both sides of the second transmission assembly 32 in order to increase the parking pressure during parking, thus improving the reliability of the drum brake.

Further, the second transmission assembly 32 includes a first push rod 321, a third connecting piece 322, and a second push rod 323, one end of the first push rod 321 being disposed adjacent to the first collar-shoe 11; one end of the third connecting piece 322 is connected with the other end of the first push rod 321, and a ratchet 3221 is arranged along the circumferential direction of the third connecting piece 322; one end of the second push rod 323 is disposed adjacent to the second collar shoe 21, and the other end of the second push rod 323 is connected to the other end of the third connecting member 322 by screw threads.

Referring to fig. 7, in this embodiment, taking a brake drum having a counterclockwise rotation tendency as an example, during parking braking, the power portion 42 drives the pull wire 41 to drive the driving arm 311 to rotate, so as to push the driving rod 312 to drive the first collar shoe 11, the first collar shoe 11 rotates counterclockwise around the contact point between the first collar shoe 11 and the second driving assembly 32, and when the first collar shoe 11 contacts the brake drum, the friction force generated between the first collar shoe 11 further causes the first collar shoe 11 to generate a counterclockwise rotation tendency, and the friction force generated by the first collar shoe 11 is greater due to the tendency; the acting force between the first collar shoe 11 and the second transmission assembly 32 is transmitted to the lower end of the second collar shoe 21 through the second transmission assembly 32, and the acting force acts as an actuating force of the second collar shoe 21, so that the second collar shoe 21 rotates anticlockwise around the supporting pin 72 and contacts with the brake drum, and the friction force between the two friction forces also promote the second collar shoe 21 to generate an energizing effect, so that the friction force is increased, and the reliability of the drum brake is enhanced.

Further, the drum brake includes an adjustment assembly 50, a first end of the adjustment assembly 50 is coupled to the support pin 72, a second end of the adjustment assembly 50 is coupled to the first collar shoe 11, and a third end of the adjustment assembly 50 is engaged with the ratchet 3221.

In this embodiment, as shown in fig. 1 and 7, the ratchet wheel 3221 is adjusted by the adjusting component 50, so that the third connecting piece 322 is driven to move relative to the second push rod 323, so that the overall length of the second transmission component 32 is increased, and the initial open state of the first collar-shoe 11 and the second collar-shoe 21 is changed, so that the gap between the first collar-shoe 11, the second collar-shoe 21 and the brake drum is adjusted.

Further, the adjusting assembly 50 comprises a tooth plate 51, a tooth plate spring 52 and a tooth plate push rod 53, the tooth plate 51 is connected with the first collar shoe 11, and the tooth plate 51 is meshed with the ratchet 3221; one end of the tooth-pulling plate ejector rod 53 is connected with the supporting pin 72, and the other end of the tooth-pulling plate ejector rod 53 is connected with the first collar shoe 11; the pinion plate spring 52 is provided along the circumferential direction of the pinion plate jack 53.

In the present embodiment, when the gap between the first collar 11 and the brake drum exceeds the set value, the tooth pulling plate 51 pulls the ratchet 3221 on the third connecting member 322 to rotate, which increases the length of the second transmission assembly 32, and further reduces the gap between the first collar 11 and the brake drum to the set range, and simultaneously reduces the gap between the second collar 21 and the brake drum.

Further, the drum brake includes a wheel cylinder assembly 60, the wheel cylinder assembly 60 is connected to the brake pad 71, and the wheel cylinder assembly 60 includes a wheel cylinder, a piston, and a push rod; wherein, the wheel cylinder is connected with the first collar shoe 11 through a piston and a push rod, and the wheel cylinder is connected with the second collar shoe 21 through a piston and a push rod. This arrangement provides for urging the first and second collar shoes 11, 21 into contact with the brake drum via the wheel cylinder assembly 60, providing for braking of the drum brake.

In another embodiment of the present application, there is also provided a vehicle including a drum brake, which is the drum brake in the above embodiment. Wherein the vehicle comprises a commercial vehicle and a household vehicle, in one of the preferred embodiments of the application the vehicle is a light truck.

In another embodiment of the present application, taking a counterclockwise rotation trend of the brake drum as an example, during parking braking, the electronic parking execution assembly 40 works, so that the stay wire 41 pulls the transmission arm 311, the transmission arm 311 rotates around a connection point between the transmission arm 311 and the first collar shoe 11 and pushes the transmission rod 312, the transmission rod 312 pushes the first collar shoe 11, the first collar shoe 11 rotates counterclockwise around a contact point between the first collar shoe 11 and the second transmission assembly 32, and when the first collar shoe 11 contacts the brake drum, the friction force generated between the first collar shoe 11 further promotes the counterclockwise rotation trend of the first collar shoe 11, and the friction force generated by the first collar shoe 11 is larger due to the trend; the acting force between the first collar shoe 11 and the second transmission assembly 32 is transmitted to the lower end of the second collar shoe 21 through the second transmission assembly 32, and acts as an actuating force of the second collar shoe 21, so that the second collar shoe 21 rotates anticlockwise around the supporting pin 72 and contacts with the brake drum, and the friction force between the two causes the second collar shoe 21 to generate an energizing effect due to the anticlockwise rotation direction of the brake drum, so that the friction force is increased; friction generated by the contact of the first collar shoe 11 and the second collar shoe 21 with the brake drum respectively causes the brake drum to generate a moment opposite to the direction of the rotation trend, so that the vehicle is stopped. The braking operation is similar when there is a clockwise rotation tendency to the brake as there is a counter-clockwise rotation tendency.

In another embodiment of the present application, taking the brake drum rotating counterclockwise as an example, during braking, the wheel cylinder assembly 60 pushes the first collar shoe 11 and the second collar shoe 21 under the action of hydraulic force, the first collar shoe 11 rotates counterclockwise around the contact point between the first collar shoe 11 and the second transmission assembly 32, and when the first collar shoe 11 contacts the brake drum, the friction force generated between the first collar shoe 11 further promotes the tendency of the first collar shoe 11 to rotate counterclockwise, and the tendency makes the friction force generated by the first collar shoe 11 larger, abbreviated as the potential increasing effect; the acting force between the first collar shoe 11 and the second transmission assembly 32 is transmitted to the lower end of the second collar shoe 21 through the second transmission assembly 32, and acts as an actuating force of the second collar shoe 21, so that the second collar shoe rotates anticlockwise around the supporting pin 72 and contacts with the brake drum, and the friction force between the two causes the second collar shoe 21 to generate an energizing effect due to the anticlockwise rotation direction of the brake drum, so that the friction force is increased; friction generated by the contact of the first collar shoe 11 and the second collar shoe 21 with the brake drum respectively causes the brake drum to generate a moment opposite to the rotation direction, thereby decelerating the vehicle. The braking operation in clockwise rotation is similar to that in counterclockwise rotation.

In another embodiment of the present application, the first and second collar shoes 11, 21 wear as the drum brake is operated, increasing the gap between them and the brake drum, and when this gap exceeds a set value, the gap needs to be adjusted to maintain the performance of the drum brake. The tooth plate 51 is in pin connection with the first collar shoe 11, the tooth plate 51 can rotate relatively to the first collar shoe 11 around the connecting pin, the upper end of the tooth plate 51 is connected with the tooth plate ejector rod 53, the tooth plate spring 52 tightly pulls the upper end of the tooth plate 51 and the supporting pin 72, and the contact point between the upper end of the tooth plate 51 and the tooth plate ejector rod 53 can be considered to be fixed relative to the brake bottom plate 71; during braking, the first collar shoe 11 rotates anticlockwise around the contact point of the first collar shoe 11 and the second transmission assembly 32, and the connection point between the first collar shoe 11 and the tooth shifting plate 51 also rotates anticlockwise around the contact point of the first collar shoe 11 and the second transmission assembly 32, so that the tooth shifting plate 51 is driven to rotate clockwise around the contact point between the first collar shoe and the tooth shifting plate push rod 53; when the gap between the first collar 11 and the brake drum exceeds the set value, the tooth pulling plate 51 will pull the ratchet wheel 3221 on the third connecting piece 322 to rotate, which increases the length of the second transmission assembly 32, and further reduces the gap between the first collar 11 and the brake drum, so that the gap between the second collar 21 and the brake drum is returned to the set range, and simultaneously the gap between the second collar 21 and the brake drum is also reduced.

In another embodiment of the present application, there is also provided a control method of a vehicle, including the steps of:

Step S1: acquiring working condition information, working state and parking request information of a target vehicle, wherein the working condition information at least comprises: fault information and normal operation information, and the working state at least comprises one of the following: the parking request information comprises at least one of the following information: requesting parking and requesting release of parking;

Step S2: under the condition that the working condition information, the working state and the parking request information meet preset conditions, controlling the target assembly to execute target actions until the working state of the target vehicle is the target working state; wherein the target component comprises at least one of: the brake drum, the first collar-shoe assembly, the second collar-shoe assembly, the transmission assembly and the electronic parking execution assembly.

Through the steps, the target vehicle can park and release parking through the drum brake, a parking system which is arranged independently is saved, the arrangement of parts is reduced, and the lightweight design of the vehicle is realized.

Further, under the condition that the working condition information, the working state and the parking request information meet preset conditions, the target component is controlled to execute target actions until the working state of the target vehicle is the target working state, and the method comprises the following steps:

Step S21: and under the condition that the working condition information is normal operation information, the working condition is in a non-parking state, and the parking request information is in a parking request condition, controlling the electronic parking execution assembly to drive the transmission assembly, and further driving the first collar and the second collar to move to the parking position until the working condition of the target vehicle is switched to the parking state. Step S22: and under the conditions that the working condition information is normal operation information, the working condition is a parking condition and the parking request information is parking release, controlling the electronic parking execution assembly to drive the transmission assembly, and further driving the first collar and the second collar to move to the initial positions until the working condition of the target vehicle is switched to a non-parking condition.

Through the steps, the target vehicle is parked and released through the drum brake, and the practicability and reliability of the drum brake are improved.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1. The transmission assembly 30 and the electronic parking execution assembly 40 are additionally arranged on the drum brake, the electronic parking execution assembly 40 comprises a power part 42, a speed reducing mechanism 43 and a pull wire 41, the power part 42 drives the pull wire 41 to pull the transmission assembly 30, and then the first collar shoe assembly 10 and the second collar shoe assembly 20 are driven to move to a parking position, the first collar shoe assembly 10 and the second collar shoe assembly 20 move along with the brake bottom plate assembly 70, at the moment, the reaction force of the transmission assembly 30 to the first collar shoe assembly 10 and the second collar shoe assembly 20 increases the braking pressure of the first collar shoe assembly 10 and the second collar shoe assembly 20, and the scheme can simultaneously realize parking and braking only through one set of brake, so that the problem that the drum brake of a light truck in the prior art does not meet the parking requirement is solved.

2. When the parking brake is applied, the power part 42 drives the stay wire 41 to drive the transmission arm 311 to rotate, so as to push the transmission rod 312 to drive the first collar shoe 11 to rotate anticlockwise around the contact point of the first collar shoe 11 and the second transmission assembly 32, and when the first collar shoe 11 contacts the brake drum, the friction force generated between the first collar shoe 11 further promotes the first collar shoe 11 to rotate anticlockwise, and the friction force generated by the first collar shoe 11 is larger due to the trend; the acting force between the first collar shoe 11 and the second transmission assembly 32 is transmitted to the lower end of the second collar shoe 21 through the second transmission assembly 32, and the acting force acts as an actuating force of the second collar shoe 21, so that the second collar shoe 21 rotates anticlockwise around the supporting pin 72 and contacts with the brake drum, and the friction force between the two friction forces also promote the second collar shoe 21 to generate an energizing effect, so that the friction force is increased, and the reliability of the drum brake is enhanced.

3. When the gap between the first collar 11 and the brake drum exceeds the set value, the tooth pulling plate 51 will pull the ratchet wheel 3221 on the third connecting piece 322 to rotate, which increases the length of the second transmission assembly 32, and further reduces the gap between the first collar 11 and the brake drum, so that the gap between the second collar 21 and the brake drum is returned to the set range, and simultaneously the gap between the second collar 21 and the brake drum is also reduced.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application, as generally described. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the application.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (15)

1. A drum brake, comprising:

A brake drum;

-a brake shoe assembly (70), the brake shoe assembly (70) being disposed within the brake drum;

a first collar-shoe assembly (10), said first collar-shoe assembly (10) being connected to said brake floor assembly (70);

A second collar-shoe assembly (20), said second collar-shoe assembly (20) being connected to said brake drum, said second collar-shoe assembly (20) being connected to said first collar-shoe assembly (10); -the first and second collar-shoe assemblies (10, 20) have an initial position away from the brake drum, and-the first and second collar-shoe assemblies (10, 20) have a parking position cooperating with the brake drum;

The transmission assembly (30) is arranged between the first collar-shoe assembly (10) and the second collar-shoe assembly (20), and the transmission assembly (30) is movably arranged relative to the first collar-shoe assembly (10) and the second collar-shoe assembly (20);

The electronic parking execution assembly (40), the electronic parking execution assembly (40) is connected with the brake bottom plate assembly (70), the electronic parking execution assembly (40) comprises a power part (42), a speed reducing mechanism (43) and a stay wire (41), an output shaft of the power part (42) is connected with an input end of the speed reducing mechanism (43), and an output end of the speed reducing mechanism (43) is connected with the transmission assembly (30) through the stay wire (41);

The power part (42) drives the stay wire (41) to pull the transmission assembly (30), so that the first collar-shoe assembly (10) and the second collar-shoe assembly (20) are driven to move to the parking position.

2. Drum brake according to claim 1, characterized in that the first collar-shoe assembly (10) comprises:

A first collar shoe (11), the first collar shoe (11) being connected to the brake floor assembly (70);

And one end of the first return spring (12) is connected with the brake bottom plate assembly (70), and the other end of the first return spring (12) is connected with the first collar shoe (11).

3. Drum brake according to claim 2, characterized in that the second collar-shoe assembly (20) comprises:

A second collar shoe (21), the second collar shoe (21) being connected to the brake pad assembly (70), the second collar shoe (21) being connected to the first collar shoe (11);

A second return spring (22), one end of the second return spring (22) is connected with the brake bottom plate assembly (70), and the other end of the second return spring (22) is connected with the second collar shoe (21);

wherein the first collar shoe (11) and the second collar shoe (21) have the initial position and the parking position.

4. A drum brake according to claim 3, wherein the brake spider assembly (70) comprises:

A brake pad (71), the electronic parking execution assembly (40) being connected to the brake pad (71);

The support pin (72), the support pin (72) with braking bottom plate (71) is connected, first leading shoe (11), first return spring (12), second leading shoe (21), second return spring (22) all with support pin (72) are connected.

5. The drum brake according to claim 4, wherein the electronic parking actuation assembly (40) comprises:

The output end of the speed reducing mechanism (43) is connected with the stay wire (41) through the screw (44), and threads are arranged on the surface of the screw (44).

6. Drum brake according to claim 5, characterized in that the reduction mechanism (43) comprises:

a worm (431), the worm (431) being connected to an output shaft of the power section (42);

-a worm wheel (432), said worm wheel (432) being in engagement with said worm (431);

The worm wheel (432) is provided with a shaft hole, and the surface of the shaft hole is provided with internal threads matched with the screw rod (44).

7. Drum brake according to claim 5 or 6, characterized in that the transmission assembly (30) comprises

-A first transmission assembly (31), the first transmission assembly (31) comprising:

A transmission arm (311), wherein the transmission arm (311) is connected with the stay wire (41), and the transmission arm (311) is connected with the first collar shoe (11);

A transmission rod (312), the transmission rod (312) being arranged adjacent to the transmission arm (311);

-a clamping spring (313), said first collar-shoe (11) being connected to said second collar-shoe (21) by means of said clamping spring (313);

a second transmission assembly (32), wherein the second transmission assembly (32) is arranged adjacent to the clamping spring (313), and two ends of the second transmission assembly (32) are respectively abutted with the first collar shoe (11) and the second collar shoe (21);

The power part (42) drives the stay wire (41) to drive the transmission arm (311) to rotate, so that the transmission rod (312) is pushed to drive the first collar shoe (11) and the second collar shoe (21) to move to the parking position.

8. Drum brake according to claim 7, characterized in that the second transmission assembly (32) comprises:

A first push rod (321), wherein one end of the first push rod (321) is arranged adjacent to the first collar shoe (11);

A third connecting member (322), wherein one end of the third connecting member (322) is connected with the other end of the first push rod (321), and a ratchet wheel (3221) is arranged along the circumferential direction of the third connecting member (322);

And one end of the second push rod (323) is arranged adjacent to the second collar shoe (21), and the other end of the second push rod (323) is connected with the other end of the third connecting piece (322) through threads.

9. The drum brake according to claim 8, wherein the drum brake comprises:

The first end of the adjusting component (50) is connected with the supporting pin (72), the second end of the adjusting component (50) is connected with the first collar shoe (11), and the third end of the adjusting component (50) is meshed with the ratchet wheel (3221).

10. Drum brake according to claim 9, characterized in that the adjustment assembly (50) comprises:

A tooth-pulling plate (51), wherein the tooth-pulling plate (51) is connected with the first collar (11), and the tooth-pulling plate (51) is meshed with the ratchet wheel (3221);

One end of the tooth shifting plate ejector rod (53) is connected with the supporting pin (72), and the other end of the tooth shifting plate ejector rod (53) is connected with the first collar shoe (11);

and the tooth poking plate spring (52) is arranged along the circumferential direction of the tooth poking plate ejector rod (53).

11. The drum brake according to claim 10, wherein the drum brake comprises:

A wheel cylinder assembly (60), the wheel cylinder assembly (60) being connected to the brake pad (71), the wheel cylinder assembly (60) comprising a wheel cylinder, a piston and a push rod;

Wherein the wheel cylinder is connected with the first collar shoe (11) through the piston and the push rod, and the wheel cylinder is connected with the second collar shoe (21) through the piston and the push rod.

12. A vehicle comprising a drum brake, wherein the drum brake is a drum brake as claimed in any one of claims 1 to 11.

13. A control method of a vehicle, characterized by comprising:

Acquiring working condition information, working state and parking request information of a target vehicle, wherein the working condition information at least comprises: fault information and normal operation information, wherein the working state at least comprises one of the following: a parking state and a non-parking state, wherein the parking request information at least comprises one of the following: requesting parking and requesting release of parking;

under the condition that the working condition information, the working state and the parking request information meet preset conditions, controlling a target component to execute target actions until the working state of the target vehicle is a target working state;

wherein the target assembly comprises at least one of: the brake drum, the first collar-shoe assembly, the second collar-shoe assembly, the transmission assembly and the electronic parking execution assembly.

14. The control method according to claim 13, characterized in that, in a case where the operating condition information, the operating state, and the parking request information satisfy the preset condition, controlling the target component to execute the target action until the operating state of the target vehicle is the target operating state, includes:

And under the condition that the working condition information is determined to be the normal operation information, the working condition is determined to be the non-parking condition, and the parking request information is determined to be the parking request condition, controlling an electronic parking execution assembly to drive the transmission assembly, and further driving the first collar and the second collar to move to the parking position until the working condition of the target vehicle is switched to the parking condition.

15. The control method according to claim 13 or 14, characterized in that, in a case where the operating condition information, the operating state, and the parking request information satisfy the preset condition, controlling the target component to execute the target action until the operating state of the target vehicle is the target operating state, includes:

and under the condition that the working condition information is determined to be the normal operation information, the working condition is determined to be the parking condition, and the parking request information is determined to be the parking release condition, controlling an electronic parking execution assembly to drive the transmission assembly, and further driving the first collar and the second collar to move to the initial position until the working condition of the target vehicle is switched to the non-parking condition.