A detachable shoe-drum brake

Abstract

The application discloses detachable coupling piece type drum brake, aims at solving the low braking efficiency and poor heat dissipation performance of the drum brake in the prior art, and discloses the following technical scheme to solve the above technical problems, comprising: a brake drum and a brake bottom plate matched with the brake drum, a plurality of brake discs are arranged on the side of the brake bottom plate close to the brake drum in the circumferential direction, and a pushing mechanism and a reset mechanism are arranged on the brake bottom plate; the application is different from the traditional drum brake, the brake disc is matched with the brake drum in the radial direction through the pushing mechanism to realize braking, the outer circumferential surface of the brake disc is completely contacted with the inner side surface of the brake drum, the contact area between the brake disc and the brake drum is increased, and the braking efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of automotive drum brake technology, and more specifically, to a detachable disc-type drum brake. Background Technology

[0002] Brake discs are an essential part of the braking system. Drum brakes are inexpensive and conform to traditional design. During braking, due to inertia, the front wheels of a four-wheeled car typically bear 70%-80% of the total load. The braking force of the front wheels is greater than that of the rear wheels, and the rear wheels play an auxiliary braking role. Therefore, in order to save costs, car manufacturers use a front disc and rear drum braking system.

[0003] In existing drum brakes, such as the lead-follower shoe brake, which is an unbalanced brake, the lifespan of the two shoes is unequal. Because the normal forces applied by the brake shoes to the brake drum are unbalanced, the sum of the normal forces of the two shoes can only be balanced by the resultant force of the wheel hub bearings. This causes an additional radial load on the wheel hub bearings, which shortens their lifespan.

[0004] Other balanced brakes, such as cam-type brakes, single-direction double-leading-shoe brakes, and double-direction leading-shoe brakes, also have many problems. Their braking efficiency and heat dissipation are much worse, making them prone to deformation, brake fade, and vibration, leading to a decrease in braking efficiency. Furthermore, drum brakes require periodic adjustment of the brake shoe clearance after a period of use, and sometimes even the entire brake drum needs to be disassembled to clean the accumulated brake dust. This is inconsistent with the user's requirement for "still as a virgin, swift as a rabbit," as shorter braking distances are the preferred method of stopping.

[0005] Chinese Patent Publication No. CN111075859B, published on December 26, 2019, discloses an invention entitled "A Bidirectional Double-Leading Shoe Drum Brake." This application reveals the following technical features: a rear housing. The bidirectional double-leading shoe drum brake has connecting end blocks installed at both ends of the brake shoe, with U-shaped grooves on the connecting end blocks. The rotation of the outer ring drives the rotation of the support arm, allowing the support column to engage in the U-shaped groove. This makes the support column the rotation fulcrum of the brake shoe. At this time, the side column also rises and abuts against one side of the support column. Thus, the brake shoe's relative position is effectively fixed at one end through the connecting end blocks. Compared to traditional floating structure designs, this design provides a stable fulcrum for the brake shoe when braking under the push of the brake wheel cylinder, ensuring the stability of the brake shoe during braking and significantly reducing the probability of failure during braking. However, in use, the contact area between the brake shoe and the rear housing is small, resulting in poor braking performance. Summary of the Invention

[0006] This invention overcomes the shortcomings of existing drum brakes, such as low braking efficiency and poor heat dissipation, and provides a detachable disc-type drum brake, which has the advantages of low braking efficiency, good braking effect and long service life.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a detachable disc-type drum brake, comprising: a brake drum and a brake base plate that cooperates with the brake drum; a plurality of brake discs are arranged in the circumferential direction on the side of the brake base plate near the brake drum; a pushing mechanism and a resetting mechanism are provided on the brake base plate; the pushing mechanism pushes the brake discs to move in the radial direction of the brake base plate to cooperate with the brake drum for braking; the resetting mechanism pushes the brake discs to move in the radial direction of the brake base plate to separate from the brake drum and stop braking.

[0008] Unlike traditional drum brakes, this invention uses a pushing mechanism to engage the brake disc radially with the brake drum to achieve braking. Because the outer circumferential surface of the brake disc is in complete contact with the inner surface of the brake drum, the contact area between the brake disc and the brake drum is increased, improving braking efficiency. Furthermore, compared to leading-shoe brakes, the brake disc in this invention is a single, fan-shaped unit, which improves the overall rigidity of the brake disc and allows heat to be conducted to the entire brake disc area, improving the overall heat dissipation effect and thus extending the overall service life of the brake disc.

[0009] Preferably, the pushing mechanism includes a pushing head, which is located at the center of the brake base plate and moves along the axial direction of the brake base plate. The pushing head has an inclined surface in the circumferential direction. The brake disc has a pushing surface that cooperates with the inclined surface at a position near the center of the brake base plate.

[0010] When braking is required, the push head is pushed to move in the axial direction. The inclined surface of the push head cooperates with the push surface at the center of the brake disc, so that it can push the brake disc to move in the radial direction closer to the side wall of the brake drum, so that the brake disc contacts the side wall of the brake drum to achieve the braking effect.

[0011] Preferably, the reset mechanism includes a reset head, a protrusion extending axially from the center of the brake disc on the side away from the brake base plate, an inclined reset surface being provided on the outer circumferential surface of the protrusion, a reset recess being provided on the reset head, and a circular groove reset surface being provided on the circumferential direction of the reset recess to cooperate with the inclined reset surface; a reset spring is provided on the side of the reset head away from the brake base plate.

[0012] After braking ends, in order to separate the brake disc from the brake drum, a circular groove reset surface is provided on the protrusion. The action of the reset spring on the protrusion allows the protrusion to move in the axial direction of the brake disc. During the movement of the protrusion, the interaction between the circular groove reset surface and the inclined reset surface allows the circular groove reset surface to guide the inclined reset surface to the center position of the brake disc, thereby separating the brake disc from the drum brake and stopping the braking.

[0013] Preferably, the reset mechanism includes a reset head, a protrusion extending axially from the center of the brake disc near the brake base plate, an inclined reset surface being provided on the outer circumferential surface of the protrusion, a reset recess being provided on the reset head, and a circular groove reset surface being provided in the circumferential direction of the reset recess to cooperate with the inclined reset surface; a reset spring being provided on the side of the reset head away from the brake base plate.

[0014] After braking ends, in order to separate the brake disc from the brake drum, a circular groove reset surface is provided on the protrusion. The action of the reset spring on the protrusion allows the protrusion to move in the axial direction of the brake disc. During the movement of the protrusion, the interaction between the circular groove reset surface and the inclined reset surface allows the circular groove reset surface to guide the inclined reset surface to the center position of the brake disc, thereby separating the brake disc from the drum brake and stopping the braking.

[0015] Preferably, the reset head and the push head are connected by a connecting rod.

[0016] The reset head and the push head are connected by a connecting rod, so that the push head and the reset head form an integral connecting rod, which facilitates the processing of the integral connecting rod.

[0017] Preferably, the brake disc and the brake base plate are connected by a radial sliding mechanism.

[0018] The radial sliding mechanism allows the brake disc to move freely along the radial direction of the brake base plate.

[0019] Preferably, the radial sliding mechanism includes: a radial groove on the brake disc, and a pin hole provided on the brake base plate; the pin hole and the radial groove are connected by a pin.

[0020] The brake disc is axially fixed to the brake base plate by a pin. Since the pin is set in a radial groove, the brake disc can move in the radial direction through the cooperation between the radial groove and the pin.

[0021] Preferably, the brake disc is provided with a slider, the slider is arranged along the radial direction of the brake base plate, and the brake base plate is provided with a slide rail that cooperates with the slider.

[0022] The slider and slide rail configuration allows the brake disc to slide along the direction of the brake base plate.

[0023] Preferably, the brake disc is a sector-shaped brake disc.

[0024] Preferably, the brake disc is provided with heat dissipation grooves along the radial direction of the brake base plate.

[0025] Heat dissipation grooves can improve the heat dissipation efficiency of brake discs, thereby increasing the service life of brake discs.

[0026] Compared with the prior art, the beneficial effects of the present invention are: (1) it increases the contact area between the brake disc and the brake drum, thereby improving the braking efficiency; (2) the brake disc is in the form of an integral fan shape, which improves the overall rigidity of the brake disc; (3) the heat is conducted to the entire brake disc area through the brake disc, thereby improving the overall heat dissipation effect of the brake disc and thus improving the overall service life of the brake disc; (4) the structure is simple, easy to disassemble and assemble, and convenient to repair and replace parts. Attached Figure Description

[0027] Figure 1 This is a structural diagram of the first embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view and a partially enlarged view of the first embodiment of the present invention;

[0029] Figure 3 This is an exploded view of the first embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the brake disc and brake base plate according to the first embodiment of the present invention;

[0031] Figure 5 This is a cross-sectional view of the integral connecting rod of the present invention;

[0032] Figure 6 This is a cross-sectional view and a partially enlarged view of the second embodiment of the present invention;

[0033] Figure 7 This is an exploded view of the second embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the brake disc structure according to the third embodiment of the present invention.

[0035] Figure 9 This is a schematic diagram of the brake base plate according to the third embodiment of the present invention.

[0036] In the diagram: 1. Brake drum, 2. Brake base plate, 21. Pin hole, 22. Slide rail, 3. Brake disc, 31. Pushing surface, 32. Protrusion, 321. Inclined reset surface, 33. Radial groove, 34. Heat dissipation groove, 35. Slider, 4. Pushing head, 41. Inclined surface, 5. Reset head, 51. Circular groove reset surface, 6. Reset spring, 7. Pin, 71. Locking plate, 8. Limiting and fixing sleeve. Detailed Implementation

[0037] The technical solution of the present invention will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0038] Example 1: Refer to Figures 1 to 5 As shown, a detachable disc-type drum brake includes: a brake drum 1 fixedly connected to a wheel hub and a brake base plate 2 that cooperates with the brake drum 1. Several brake discs 3 are arranged circumferentially on the side of the brake base plate 2 near the brake drum 1. The brake discs 3 are fan-shaped brake discs. In this embodiment, the number of brake discs 3 is four. A pushing mechanism and a resetting mechanism are provided on the brake base plate 2. The pushing mechanism pushes the brake discs 3 to move radially along the brake base plate 2 to cooperate with the brake drum 1 for braking. The resetting mechanism pushes the brake discs 3 to move radially along the brake base plate 2 to separate from the brake drum 1 and stop braking.

[0039] The pushing mechanism includes a pushing head 4, which is located at the center of the brake base plate 2 and moves along the axial direction of the brake base plate 2. An inclined surface 41 is provided on the outer circumference of the pushing head 4. In this embodiment, the pushing head 4 is set in a conical shape, and the conical surface is the inclined surface 41. A pushing surface 31 that cooperates with the inclined surface 41 is provided near the center of the brake base plate 2 on the brake disc 3. The pushing surfaces 31 of the four brake discs 3 are arranged in the circumferential direction of the inclined surface 41.

[0040] The reset mechanism includes a reset head 5. A protrusion 32 extends axially from the center of the brake disc 3 on the side away from the brake base plate 2. An inclined reset surface 321 is provided on the outer circumferential surface of the protrusion 32. The inclined reset surface 321 is a partial conical surface. The inclined reset surfaces 321 on the four protrusions 32 cooperate to form an outer conical surface. A reset recess is provided on the reset head 5. A circular groove reset surface 51 is provided on the circumference of the reset recess to cooperate with the inclined reset surface 321. The circular groove reset surface 51 is an inner conical surface. A reset spring 6 is provided on the side of the reset head 5 away from the brake base plate 2. The reset spring 6 provides support force to the reset head 5.

[0041] The reset head 5 and the push head 4 are connected by a connecting rod to form an integral connecting rod. The integral connecting rod is integrally molded, which is convenient for processing.

[0042] The brake disc 3 and the brake base plate 2 are connected by a radial sliding mechanism, which allows the brake disc to move freely along the radial direction of the brake base plate. In this embodiment, the radial sliding mechanism includes: a radial groove 33 on the brake disc 3 and a pin hole 21 on the brake base plate 2; the pin hole 21 and the radial groove 33 are connected by a pin 7; one end of the pin 7 is provided with a limiting head, and the other end is provided with a locking plate 71. The locking plate 71 cooperates with the limiting head to connect the brake disc 3 and the brake base plate 2, thereby limiting the brake disc 3 in the axial direction. Since the pin 7 is located in the radial groove 33, the brake disc 3 can move in the radial direction through the cooperation of the radial groove 33 and the pin 7.

[0043] To improve the heat dissipation efficiency of the brake disc 3, multiple heat dissipation grooves 34 are provided on the brake disc 4 along the radial direction of the brake backing plate 3. The heat dissipation grooves 34 can improve the heat dissipation efficiency of the brake disc 3, thereby increasing the service life of the brake disc 3.

[0044] The working principle of this invention is as follows: In this embodiment, a detachable disc-type drum brake is installed on one side of the wheel hub. The brake drum 1 is fixed to the wheel hub by bolts. The brake base plate 2 is welded to the axle tube on the axle of the vehicle axle. When the vehicle is moving, the brake drum 1 rotates with the wheel hub, while the brake base plate 2 remains stationary. When braking the wheel hub is required, an integrated connecting rod is pushed axially (the pushing can be accomplished by mechanical structure, hydraulic push, or pneumatic push, and the specific structure is not limited) towards the brake disc 1. This causes the inclined surface on the push head 4 to cooperate with the push surface at the center of the brake disc 2, so that the inclined surface 41 on the push head 4 interacts with the push surface 31. As a result, the push head 31 pushes the brake disc 3 to move radially towards the brake base plate 2. The outer arc surface of the brake disc 3... The brake disc 3 generates braking force by contacting the inner wall of the brake drum 1, thereby braking the wheel hub. When braking is completed and braking of the brake drum 1 is no longer required, the pushing force acting on the push head 4 is eliminated. Through the force of the return spring 6 on the return head 5, the return head 5 can move axially towards the protrusion 32. During the movement of the protrusion 32, the circular groove return surface 51 and the inclined return surface 321 interact with each other, so that the circular groove return surface 51 can guide the inclined return surface 321, and the inner conical surface of the circular groove return surface 51 can form a contraction effect on the outer conical surface of the inclined return surface 321. This allows the brake disc 3 to move radially away from the inner wall of the brake drum 1, so that the outer arc surface of the brake disc 3 separates from the inner wall of the brake drum 1, thereby eliminating the braking force.

[0045] Example 2: Refer to Figures 6 to 7As shown, this embodiment is similar in structure to embodiment 1, except that in this embodiment, there are two detachable disc-type drum brakes that are symmetrically arranged on both sides of the inside of the wheel hub. The brake drum 1 is connected to the wheel hub by bolts. The brake base plates 2 of the two detachable disc-type drum brakes are arranged facing each other. At the same time, the brake base plates 2 of the two detachable disc-type drum brakes are fixedly connected by a limiting sleeve. The reset head 5 is arranged in the limiting fixing sleeve 8, and the reset spring 6 abuts between the reset heads 5 of the two detachable disc-type drum brakes.

[0046] In this embodiment, the brake backing plate 2 is welded to the axle tube at the end of the axle on the axle. Specifically, the axle tube needs to be bent and fixed to the brake disc 1 (the specific structural form is not described in detail here). When braking the wheel hub is required, the integrated connecting rods of two detachable disc-type drum brakes are moved towards the brake disc 3 by pushing along the axial direction (the pushing can be accomplished by mechanical, hydraulic, or pneumatic methods, and the specific structure is not limited). This causes the inclined surface 41 on the pushing head 4 to engage with the pushing surface 31 at the center of the brake disc 3, so that the inclined surface 41 on the pushing head 4 interacts with the pushing surface 31. This pushes the brake disc 3 radially towards the brake backing plate 2, and the outer arc surface of the pushing disc 3 contacts the inner wall of the brake drum 1. The contact generates braking force, thereby braking the wheel hub. When braking is complete and braking of the brake drum 1 is no longer required, the pushing force acting on the push head 4 is eliminated. Through the force exerted by the return spring 6 on the return heads 5 at both ends, the return heads 5 can move axially towards the protrusion 32. During the movement of the protrusion 32, the interaction between the circular groove return surface 51 and the inclined return surface 321 allows the circular groove return surface 51 to guide the inclined return surface 321, so that the inner conical surface of the circular groove return surface 51 can form a contraction effect on the outer conical surface of the inclined return surface 321. This allows the brake disc 3 to move radially away from the side of the brake drum 1, so that the outer arc surface of the brake disc 3 separates from the inner wall of the brake drum 1, thereby eliminating the braking force.

[0047] Example 3: Reference Figures 8 to 9 As shown, this embodiment is structurally similar to Embodiment 1 or Embodiment 2, except that the radial sliding mechanism connecting the brake disc 3 and the brake base plate 2 is different. In this embodiment, the radial sliding mechanism includes a slider 35 disposed on the brake disc 3, which is arranged along the radial direction of the brake base plate 2. The brake base plate 2 is provided with a slide rail 22 that cooperates with the slider 35. To reduce the friction between the two, a linear bearing is provided inside the slide rail 22.

[0048] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A detachable disc-type drum brake, characterized in that, include: The system includes a brake drum and a brake base plate that mates with the brake drum. The brake base plate has several brake discs arranged circumferentially on its side near the brake drum. The brake base plate is equipped with a pushing mechanism and a resetting mechanism. The pushing mechanism pushes the brake discs to move radially along the brake base plate to engage with the brake drum for braking. The resetting mechanism pushes the brake discs to move radially along the brake base plate to separate from the brake drum and stop braking. The pushing mechanism includes a pushing head, which is located at the center of the brake base plate and moves along the axial direction of the brake base plate. The pushing head has an inclined surface in the circumferential direction. The brake disc has a pushing surface that cooperates with the inclined surface at a position near the center of the brake base plate. The reset mechanism includes a reset head, a protrusion extending axially from the center of the brake disc on the side away from the brake base plate, an inclined reset surface on the outer circumferential surface of the protrusion, a reset recess on the reset head, a circular groove reset surface that mates with the inclined reset surface on the circumferential direction of the reset recess, and a reset spring on the side of the reset head away from the brake base plate. The reset head and the push head are connected by a connecting rod.

2. The detachable disc-type drum brake according to claim 1, characterized in that, The brake disc and the brake base plate are connected by a radial sliding mechanism.

3. The detachable disc-type drum brake according to claim 2, characterized in that, The radial sliding mechanism includes a radial groove on the brake disc.

4. The detachable disc-type drum brake according to claim 3, characterized in that, The brake base plate is provided with pin holes.

5. The detachable disc-type drum brake according to claim 4, characterized in that, The pin hole and the radial groove are connected by a pin.

6. The detachable disc-type drum brake according to claim 2, characterized in that, The brake disc is equipped with a slider.

7. The detachable disc-type drum brake according to claim 6, characterized in that, The slider is arranged along the radial direction of the brake base plate, and the brake base plate is provided with a slide rail that cooperates with the slider.

8. The detachable disc-type drum brake according to any one of claims 1 to 7, characterized in that, The brake disc is a sector-shaped brake disc.

9. The detachable disc-type drum brake according to claim 8, characterized in that, The brake disc has heat dissipation grooves arranged along the radial direction of the brake base plate.

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