Split type brake bottom plate and drum brake assembly

Abstract

The invention relates to a split type brake bottom plate and a drum brake assembly, the split type brake bottom plate comprises a bottom plate shell and a mounting plate, and the bottom plate shell is of a disc-shaped structure with one open end; the mounting plate is located in the bottom plate shell and detachably connected with the bottom plate shell, a first mounting hole used for being connected with a brake wheel cylinder and a second mounting hole used for being connected with an axle are formed in the mounting plate, and the thickness of the mounting plate is larger than that of the bottom plate shell. The mounting plate is arranged in the bottom plate shell, so that the brake bottom plate forms an inward concave height, the thickness of the mounting plate is larger than that of the bottom plate shell, the axial impact resistance of the brake bottom plate is guaranteed, meanwhile, the brake bottom plate is lightened, split type arrangement of the brake bottom plate is achieved, damaged parts are convenient to replace, and the maintenance cost is reduced; the technical problems that in the prior art, after bearing large impact force and vibration for a long time, a brake bottom plate is prone to fatigue damage, and due to the fact that the structure of the brake bottom plate needs overall replacement, the maintenance cost is high, and time and labor are consumed are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brakes, in particular to a split brake bottom plate and drum brake assembly. BACKGROUND

[0002] The current brake is a device with the function of making the moving parts decelerate, stop or keep static state, etc. The brake mainly has disc type and drum type two forms. The drum brake is usually applied to commercial vehicles due to its low cost and high durability. In the brake assembly, the brake bottom plate is used to fix the brake and keep it in a relatively static state, which is the key supporting component of the vehicle brake.

[0003] In the related art, the brake generates a large impact force and vibration when working. After long-term bearing of such force, the brake bottom plate is prone to fatigue damage, affecting the reliability and safety of the brake system. The brake bottom plate often needs to be replaced as a whole due to its structure, which is time-consuming and laborious.

[0004] Therefore, it is necessary to design a new split brake bottom plate to overcome the above problems. SUMMARY

[0005] The present application provides a split brake bottom plate and drum brake assembly, which can solve the technical problem that the brake bottom plate in the related art is prone to fatigue damage after long-term bearing of a large impact force and vibration, and often needs to be replaced as a whole due to its structure, which is time-consuming and laborious.

[0006] In a first aspect, the embodiments of the present application provide a split brake bottom plate, which comprises a bottom plate shell and a mounting plate. The bottom plate shell is a disc-shaped structure with one end open. The mounting plate is located in the bottom plate shell and is detachably connected with the bottom plate shell. The mounting plate is provided with a first mounting hole for connecting a brake cylinder and a second mounting hole for connecting an axle. The thickness of the mounting plate is greater than that of the bottom plate shell.

[0007] The bottom plate shell and the mounting plate are made of hot-rolled steel plates. The mounting plate is arranged in the bottom plate shell to form an inwardly recessed height. The thickness of the mounting plate is greater than that of the bottom plate shell. The mounting plate with large stress is made of thick plate, and the bottom plate shell with small stress is made of thin plate. The split brake bottom plate has good axial impact resistance and is lightweight. When the split brake bottom plate is damaged, only the damaged part needs to be replaced, without the need for overall replacement, which greatly shortens the repair time and effectively reduces the repair cost.

[0008] In combination with the first aspect, in an embodiment, the thickness of the bottom shell is set to 1-2mm, and the thickness of the mounting plate is set to 8-11mm. In combination with the first aspect, in an embodiment, the thickness of the bottom shell is set to 1-2mm, and the thickness of the mounting plate is set to 8-11mm.

[0009] In combination with the first aspect, in an embodiment, the outer periphery of the bottom shell is provided with a plurality of bosses.

[0010] In combination with the first aspect, in an embodiment, the outer periphery of the bottom shell is provided with a plurality of bosses.

[0011] In combination with the first aspect, in an embodiment, the first mounting holes are arranged in a rectangular array at both ends of the mounting plate.

[0012] In combination with the first aspect, in an embodiment, the first mounting holes are arranged in a rectangular array at both ends of the mounting plate.

[0013] In combination with the first aspect, in an embodiment, the bottom shell is provided with third mounting holes corresponding to the first mounting holes, and the bottom shell and the mounting plate are fixed by bolts passing through the first mounting holes and the third mounting holes.

[0014] In combination with the first aspect, in an embodiment, the bottom shell is provided with third mounting holes corresponding to the first mounting holes, and the bottom shell and the mounting plate are fixed by bolts passing through the first mounting holes and the third mounting holes.

[0015] In combination with the first aspect, in an embodiment, the mounting plate is provided with a first shaft hole, and the bottom shell is provided with a second shaft hole corresponding to the first shaft hole, and the area of the second shaft hole is greater than the area of the first shaft hole.

[0016] The first shaft hole and the second shaft hole are used for mounting a knuckle or a rear axle, the second shaft hole is a lightening hole, and the second shaft hole is hexagonal in shape, so that redundant material is removed from the middle of the bottom shell.

[0017] In combination with the first aspect, in an implementation, the second mounting holes are uniformly distributed on the outer periphery of the first shaft hole.

[0018] The second mounting holes are used for connecting a knuckle or a rear axle, and the number of the second mounting holes is four, and the four second mounting holes are uniformly distributed on the outer periphery of the first shaft hole, and the knuckle is fixed to the mounting plate through the second mounting holes by bolts.

[0019] In combination with the first aspect, in an implementation, the mounting plate is shaped.

[0020] The mounting plate is shaped according to the mounting requirements of a brake, and the mounting plate is shaped, so that the mounting position of the mounting plate is ensured, the use area of the mounting plate is reduced, the use of material of the mounting plate is minimized on the premise of ensuring the use strength, and the light weight of the split brake bottom plate is realized.

[0021] In the second aspect, an embodiment of the present application provides a drum brake assembly, which comprises the split brake bottom plate and a brake cylinder.

[0022] The mounting base of the brake cylinder is provided with a plurality of threaded holes, the bolts pass through the threaded holes, the first mounting hole and the third mounting hole, and the brake cylinder, the mounting plate and the bottom shell are fixed together, so that the material is saved and no additional connecting components are needed.

[0023] In combination with the second aspect, in an implementation, the drum brake assembly further comprises a brake shoe assembly, the outer periphery of the bottom shell is provided with a plurality of bosses, the brake shoe assembly is in contact with the bosses, and is fixed to the bottom shell by a positioning spring pin.

[0024] The outer periphery of the bottom plate shell is provided with a fourth mounting hole, the fourth mounting hole is used for mounting the positioning spring pin, the positioning spring pin is used for limiting the relative position of the brake shoe assembly in the drum brake assembly, the brake shoe assembly includes a left brake shoe and a right brake shoe, the left brake shoe and the right brake shoe are connected through a return spring, and the top surface of the boss is in contact with the bottom surface of the brake shoe assembly, so that the brake shoe assembly is prevented from moving axially, the surface of the boss is coated with lubricating grease, the friction between the brake shoe assembly and the bottom plate shell is reduced, and the noise and wear generated by the drum brake assembly during operation are effectively reduced.

[0025] The technical scheme provided by the embodiment of the application has the beneficial effects that: By arranging the mounting plate in the bottom plate shell, the brake bottom plate is formed to be concave inward, the thickness of the mounting plate is greater than the thickness of the bottom plate shell, the axial impact resistance of the brake bottom plate is ensured, the brake bottom plate is lightened, the brake bottom plate is arranged in a split mode, damaged parts are convenient to replace, the maintenance cost is reduced, and the technical problem that the brake bottom plate is prone to fatigue damage after long-term bearing of a large impact force and vibration, and the brake bottom plate needs to be replaced as a whole due to the structure, the maintenance cost is high, and time and labor are consumed is solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiment of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 A front view of a split brake bottom plate provided by the embodiment of the application; Figure 2 An explosion view of a split brake bottom plate provided by the embodiment of the application; Figure 3 A schematic view of a bottom plate shell provided by the embodiment of the application; Figure 4 A schematic view of a mounting plate provided by the embodiment of the application; Figure 5 A front view of a drum brake assembly provided by the embodiment of the application; Figure 6 A back view of a drum brake assembly provided by the embodiment of the application; Figure 7 An explosion view of a drum brake assembly provided by the embodiment of the application.

[0028] Fig. 1, bottom plate shell; 11, boss; 12, third mounting hole; 13, second shaft hole; 14, fourth mounting hole; 2, mounting plate; 21, first mounting hole; 22, second mounting hole; 23, first shaft hole; 3, brake cylinder; 4, brake shoe assembly; 5, positioning spring pin; 6, return spring; 7, knuckle. DETAILED DESCRIPTION

[0029] In order for those skilled in the art to better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] The embodiment of the present application provides a split brake bottom plate and drum brake assembly, which can solve the technical problem that the brake bottom plate is prone to fatigue damage after long-term bearing of a large impact force and vibration, and the brake bottom plate often needs to be replaced as a whole, resulting in high maintenance cost and time-consuming and laborious.

[0031] Referring to Figures 1-4 As shown in the drawings, the embodiment of the present application provides a split brake bottom plate, which comprises a bottom plate shell 1 and a mounting plate 2, the bottom plate shell 1 is a disc-shaped structure with one end open; the mounting plate 2 is located in the bottom plate shell 1 and detachably connected with the bottom plate shell 1, the mounting plate 2 is provided with a first mounting hole 21 for connecting a brake cylinder 3 and a second mounting hole 22 for connecting an axle, and the thickness of the mounting plate 2 is greater than the thickness of the bottom plate shell 1.

[0032] In the embodiment, the bottom plate shell 1 and the mounting plate 2 are both made of hot-rolled steel plate, the mounting plate 2 is arranged in the bottom plate shell 1, so that the brake bottom plate is formed to be inwardly recessed, and the thickness of the mounting plate 2 is greater than the thickness of the bottom plate shell 1, the mounting plate 2 with large stress is arranged as a thick plate, and the bottom plate shell 1 with small stress is arranged as a thin plate, so as to ensure the axial impact resistance of the brake bottom plate, make the brake bottom plate lightweight, realize the split arrangement of the brake bottom plate, and when the split brake bottom plate is damaged, only the damaged part needs to be replaced, without the need for overall replacement, thereby greatly shortening the maintenance time and effectively reducing the maintenance cost.

[0033] The embodiment sets the mounting plate 2 in the bottom plate shell 1 to form an inwardly recessed height of the brake bottom plate, wherein the thickness of the mounting plate 2 is greater than the thickness of the bottom plate shell 1, which ensures the axial impact resistance of the brake bottom plate while lightening the brake bottom plate, realizes the split setting of the brake bottom plate, facilitates the replacement of damaged parts, reduces the maintenance cost, and solves the technical problems in the related art that the brake bottom plate is prone to fatigue damage after long-term bearing of a large impact force and vibration, and the brake bottom plate often needs to be replaced as a whole due to its structure, which is time-consuming and laborious.

[0034] Further, referring to Figures 1-4 In some embodiments, the thickness of the bottom plate shell 1 is set to 1-2 mm, and the thickness of the mounting plate 2 is set to 8-11 mm.

[0035] In the embodiment, the thickness of the bottom plate shell 1 can be set to 1-2 mm, and the thickness of the mounting plate 2 can be set to 8-11 mm. Preferably, the thickness of the bottom plate shell 1 is set to 1.5 mm, and the thickness of the mounting plate 2 is set to 10 mm. The split brake bottom plate mainly bears the braking torque generated by the brake shoe assembly 4. The braking torque is generated by the brake drum being pressed and tightened by the brake cylinder 3 pushing the shoe to open. Through geometric relationship and mechanical balance, the braking torque is equivalent to the push rod force generated by the brake cylinder 3. The position of the split brake bottom plate where the maximum stress occurs is near the first mounting hole 21. According to the actual stress condition of the split brake bottom plate, the maximum stress near the first mounting hole 21 corresponding to Example 1, Example 2 and Comparative Example 1 is simulated and analyzed by finite element. The results show that the maximum stress near the first mounting hole 21 corresponding to Example 1 is 820 MPa, the maximum stress near the first mounting hole 21 corresponding to Example 2 is 630 MPa, and the maximum stress near the first mounting hole 21 corresponding to Comparative Example 1 is 720 MPa. The service strength of Example 2 meets the requirements.

[0036] Load: The maximum braking torque of the brake drum is set to 6000 N·m, and the distance between the two brake cylinders is set to 230 mm, which is converted to a brake cylinder push rod force of 26000 N. The calculation formula of the brake cylinder push rod force is: , F is the brake cylinder push rod force, Mr is the maximum brake torque of the brake drum, L is the distance between the two brake cylinder push rod shafts, Embodiment I: the thickness of the bottom plate shell 1 is set to 1.5mm, the thickness of the mounting plate 2 is set to 8mm, and the weight of the brake bottom plate is 2.85kg, Embodiment II: the thickness of the bottom plate shell 1 is set to 1.5mm, the thickness of the mounting plate 2 is set to 10mm, and the weight of the brake bottom plate is 3.3kg, Comparative Example I: the brake bottom plate is an integral structure, and the thickness is set to 5mm, and the weight of the brake bottom plate is 4.75kg, the weight of the split brake bottom plate is more than 33% lighter than the weight of the integral brake bottom plate, effectively reducing the weight of the whole vehicle, thereby reducing the energy consumption of the whole vehicle.

[0037] Further, referring to Figures 1-3 In some embodiments, the outer periphery of the bottom plate shell 1 is provided with a plurality of bosses 11.

[0038] In this embodiment, the bottom plate shell 1 is provided with a first protruding portion towards the side close to the mounting plate 2, the outer shape of the first protruding portion is circular, and a gap is provided between the edge of the first protruding portion and the edge of the brake drum, the bosses 11 are located on the outer periphery of the first protruding portion, the bosses 11 are in contact with the side surface of the brake shoe assembly 4 to resist the axial impact transmitted by the front axle or the rear axle, and the stiffness of the bottom plate shell 1 is improved, and the number of bosses 11 is set to six, and the six bosses 11 are evenly distributed on the outer periphery of the bottom plate shell 1, the first protruding portion is provided with a second protruding portion towards the side close to the mounting plate 2, the outer shape of the second protruding portion is adapted to the outer shape of the mounting plate 2, and the mounting plate 2 is mounted on the second protruding portion.

[0039] Further, referring to Figure 4 In some embodiments, the first mounting holes 21 are arranged in a rectangular array at both ends of the mounting plate 2.

[0040] In this embodiment, the number of first mounting holes 21 is set to eight, four first mounting holes 21 form a group and are arranged in a rectangular array, and the eight first mounting holes 21 are symmetrically arranged at both ends of the mounting plate 2.

[0041] Further, referring to Figures 1-4 In some embodiments, the bottom plate shell 1 is provided with a third mounting hole 12 corresponding to the first mounting hole 21, and the bottom plate shell 1 and the mounting plate 2 are fixed by bolts passing through the first mounting hole 21 and the third mounting hole 12.

[0042] In the embodiment, the third mounting hole 12 is arranged opposite to the first mounting hole 21, and the bolt passes through the first mounting hole 21 and the third mounting hole 12 to connect the bottom plate shell 1 and the mounting plate 2, so that the bottom plate shell 1 and the mounting plate 2 are detachably connected.

[0043] Further, referring to Figures 3-6 , in some embodiments, the mounting plate 2 is provided with a first shaft hole 23, and the bottom plate shell 1 is provided with a second shaft hole 13 corresponding to the first shaft hole 23, and the area of the second shaft hole 13 is greater than the area of the first shaft hole 23.

[0044] In the embodiment, the first shaft hole 23 and the second shaft hole 13 are used to mount a knuckle 7 or a rear axle, the second shaft hole 13 is a weight-reducing hole, and the second shaft hole 13 is hexagonal, so that the redundant material in the middle of the bottom plate shell 1 is removed to the maximum extent, the knuckle 7 includes a knuckle body and a shaft rod connected to each other, the knuckle body is fixed to the mounting plate 2, and the shaft rod passes through the first shaft hole 23 and the second shaft hole 13.

[0045] Further, referring to Figure 4 , in some embodiments, the second mounting holes 22 are uniformly distributed on the periphery of the first shaft hole 23.

[0046] In the embodiment, the second mounting holes 22 are used to connect the knuckle 7 or the rear axle, and the number of the second mounting holes 22 is four, the four second mounting holes 22 are uniformly distributed on the periphery of the first shaft hole 23, and the knuckle 7 is fixed to the mounting plate 2 by passing through the second mounting holes 22.

[0047] Further, referring to Figure 1 , Figure 2 and Figure 4 , in some embodiments, the mounting plate 2 is provided in a special shape.

[0048] In the embodiment, the shape of the mounting plate 2 is optimized according to the mounting requirements of the brake, the mounting plate 2 is provided in a special shape, the mounting position of the mounting plate 2 is ensured, the use area of the mounting plate 2 is reduced, the material use of the mounting plate 2 is reduced to the maximum extent under the premise of ensuring the use strength, and the split brake bottom plate is lightened.

[0049] Referring to Figures 5-7As shown, the drum brake assembly provided by the embodiments of the present application comprises the split brake backing plate and the brake cylinder 3, the split brake backing plate comprises the backing plate shell 1 and the mounting plate 2, the bottom of the brake cylinder 3 is provided with a threaded hole, and the brake cylinder 3 is fixed with the backing plate shell 1 and the mounting plate 2 by a bolt passing through the threaded hole.

[0050] In the embodiments, the mounting base of the brake cylinder 3 is provided with a plurality of threaded holes, the bolt passes through the threaded hole, the first mounting hole 21 and the third mounting hole 12, and the brake cylinder 3, the mounting plate 2 and the backing plate shell 1 are fixed together, thereby saving materials and without additional connection components.

[0051] Further, as shown in Figure 3 、 Figure 5 and Figure 7 , in some embodiments, the drum brake assembly further comprises a brake shoe assembly 4, the outer periphery of the backing plate shell 1 is provided with a plurality of bosses 11, the brake shoe assembly 4 is in contact with the bosses 11 and is fixed with the backing plate shell 1 by a positioning spring pin 5.

[0052] In the embodiments, the outer periphery of the backing plate shell 1 is provided with a fourth mounting hole 14, the fourth mounting hole 14 is used for mounting the positioning spring pin 5, the positioning spring pin 5 is used for limiting the relative position of the brake shoe assembly 4 in the drum brake assembly, the brake shoe assembly 4 comprises a left brake shoe and a right brake shoe, the left brake shoe and the right brake shoe are connected by a return spring 6, and the outer periphery of the backing plate shell 1 is provided with six bosses 11, the top surface of the boss 11 is in contact with the bottom surface of the brake shoe assembly 4, the brake shoe assembly 4 is prevented from moving axially, the bosses 11 are coated with lubricating grease, the friction between the brake shoe assembly 4 and the backing plate shell 1 is reduced, and the noise and wear generated by the drum brake assembly during operation are effectively reduced.

[0053] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] It has to be noted that, in the present application, the terms "first", "second", etc. are used only to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0055] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the scope of the application is intended to be defined only as set forth in the claims.

Claims

1. A split brake backing plate characterized by, It includes: The bottom plate shell (1) is a disc-shaped structure with one end open; The mounting plate (2) is located in the bottom plate shell (1) and is detachably connected with the bottom plate shell (1), the mounting plate (2) is provided with first mounting holes (21) for connecting brake wheel cylinders (3) and second mounting holes (22) for connecting axles, and the thickness of the mounting plate (2) is greater than the thickness of the bottom plate shell (1).

2. The split brake backing plate of claim 1, wherein, The thickness of the bottom plate shell (1) is set to 1-2mm, and the thickness of the mounting plate (2) is set to 8-11mm.

3. The split brake backing plate of claim 1, wherein, The outer periphery of the bottom plate shell (1) is provided with a plurality of bosses (11).

4. The split brake backing plate of claim 1, wherein, The first mounting holes (21) are arranged in a rectangular array at both ends of the mounting plate (2).

5. The split brake backing plate of claim 1, wherein, The bottom plate shell (1) is provided with third mounting holes (12) corresponding to the first mounting holes (21), and the bottom plate shell (1) and the mounting plate (2) are fixed by bolts passing through the first mounting holes (21) and the third mounting holes (12).

6. The split brake backing plate of claim 1, wherein, The mounting plate (2) is provided with first shaft holes (23), and the bottom plate shell (1) is provided with second shaft holes (13) corresponding to the first shaft holes (23), and the area of the second shaft holes (13) is greater than the area of the first shaft holes (23).

7. The split brake backing plate of claim 6, wherein, The second mounting holes (22) are uniformly distributed around the first shaft holes (23).

8. The split brake backing plate of claim 1, wherein, The mounting plate (2) is provided as a special shape.

9. A drum brake assembly characterized by, It includes the split brake bottom plate and the brake wheel cylinder (3) as claimed in any one of claims 1-7, the split brake bottom plate includes the bottom plate shell (1) and the mounting plate (2), the bottom of the brake wheel cylinder (3) is provided with a threaded hole, and the brake wheel cylinder (3) is fixed with the bottom plate shell (1) and the mounting plate (2) by bolts passing through the threaded hole.

10. The drum brake assembly of claim 9 wherein, It also includes a brake shoe assembly (4), the outer periphery of the bottom plate shell (1) is provided with a plurality of bosses (11), the brake shoe assembly (4) is in contact with the bosses (11) and is fixed with the bottom plate shell (1) by a positioning spring pin (5).

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