A front-to-rear linked anti-lock braking system

Abstract

This invention provides a front-to-rear linked anti-lock braking system. The braking system includes a first brake lever, a second brake lever, a drum brake assembly, a hydraulic brake assembly, and a lever assembly. The lever assembly is connected to both the drum brake assembly and the hydraulic brake assembly. The first and second brake levers are respectively connected to the lever assembly via cables, so that either the first or second brake lever, or both, can drive the lever assembly to move, thereby causing the drum brake assembly and the hydraulic brake assembly to brake in tandem. The hydraulic brake assembly includes a brake upper pump driven by the lever assembly, a brake caliper for performing braking actions, and a pressure regulating device disposed in the hydraulic oil flow path between the brake upper pump and the brake caliper. The pressure regulating device is configured to be driven from an initial state to a terminated state by the hydraulic oil supplied by the brake upper pump, thereby limiting the pressure of the hydraulic oil supplied by the brake upper pump to the brake caliper and preventing the brake caliper from locking up.

Description

Technical Field

[0001] This utility model relates to the field of cycling vehicle technology, and in particular to an anti-lock braking system that links the front and rear brakes. Background Technology

[0002] The reliability of the braking system is crucial for ensuring the safety of bicycles, motorcycles, and other motorized vehicles. Currently, drum brakes (sometimes called hub brakes) and hydraulic disc brakes (also known as oil brakes) are the mainstream braking methods, each with its own advantages and disadvantages: drum brakes have a simple structure but poor heat dissipation, while hydraulic brakes have strong braking force but are prone to lock-up due to excessive hydraulic pressure. Existing technology lacks a linkage system that effectively integrates these two braking methods and achieves anti-lock braking functionality, making it difficult to guarantee the braking stability and safety of motorized vehicles under complex conditions such as slippery roads, long downhill slopes, and emergency braking. Furthermore, traditional braking systems typically control the front and rear wheels independently, requiring riders to operate the front and rear brake levers separately to control the braking of the front and rear wheels. In emergency braking scenarios, riders often lack reaction time or have poor coordination, making it difficult to accurately distribute braking force between the front and rear wheels. This can easily lead to single-wheel lock-up causing a forward rollover or a skid, or insufficient braking force resulting in a long braking distance, seriously affecting riding safety.

[0003] Therefore, it is necessary to propose a new technical solution to overcome the above-mentioned shortcomings. Utility Model Content

[0004] This invention provides a front-to-rear linkage anti-lock braking system to enhance the stability and safety of the braking system during braking.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a front-to-rear linkage anti-lock braking system for braking bicycles, comprising a first brake lever, a second brake lever, a drum brake assembly, and a hydraulic brake assembly. The braking system further comprises a lever device, which is associated with the drum brake assembly and the hydraulic brake assembly. The first brake lever and the second brake lever are respectively connected to the lever device via cables, so that either the first brake lever or the second brake lever, or both, drive the lever device to move, thereby causing the drum brake assembly and the hydraulic brake assembly to brake in linkage. The hydraulic brake assembly includes a brake upper pump driven by the lever device, a brake caliper for performing braking actions, and a pressure regulating device disposed on the hydraulic oil flow path between the brake upper pump and the brake caliper. The pressure regulating device is configured to be driven by the hydraulic oil supplied by the brake upper pump from an initial state to a terminated state, thereby limiting the pressure of the hydraulic oil supplied by the brake upper pump to the brake caliper and preventing the brake caliper from locking up.

[0006] Optionally, the lever device and the upper brake pump are configured on the drum brake assembly.

[0007] Optionally, the lever device is configured to swing about a predetermined pivot axis, the lever device including a first actuation part coaxially disposed with respect to the pivot axis, the first actuation part rotating about the pivot axis to drive the drum brake assembly to brake.

[0008] Optionally, the drum brake assembly includes a brake drum, a brake block, and an elastic reset member that applies an elastic force to the brake block, wherein the first actuating part rotates about the pivot axis to drive the brake block to press against the brake drum.

[0009] Optionally, the lever assembly includes a second actuating part that oscillates about the pivot axis and abuts against the piston of the brake upper pump.

[0010] Optionally, the lever device includes a lever body and a swing block. The swing block includes a pivot portion and two cable connection portions disposed on both sides of the pivot portion. The swing block is pivotally connected to the lever body through the pivot portion, and the first brake lever and the second brake lever are respectively connected to the cable connection portions through cables, so that the swing block can swing relative to the lever body within a set angle range.

[0011] Optionally, the pressure regulating device is disposed on the drum brake assembly, and the pressure regulating device is connected to the cylinder of the brake upper pump.

[0012] Optionally, the pressure regulating device is configured to: maintain the initial state when the pressure of the hydraulic oil supplied by the brake upper pump does not reach a preset threshold; and move from the initial state to the termination state when the pressure of the hydraulic oil supplied by the brake upper pump reaches the preset threshold.

[0013] Optionally, the pressure regulating device includes a pressure regulating chamber, a pressure regulating spring disposed in the pressure regulating chamber, and a pressure regulating piston movably disposed in the pressure regulating chamber. The pressure regulating spring elastically abuts against the pressure regulating piston, and the hydraulic oil supplied by the brake pump can act on the pressure regulating piston to overcome the elastic force of the pressure regulating spring and move within the pressure regulating chamber.

[0014] Optionally, the pressure regulating chamber contains gas, and the pressure regulating device includes a flow regulating valve that communicates with the pressure regulating chamber and can adjust the gas flow rate.

[0015] The anti-lock braking system provided by this utility model is a front and rear linkage system. The linkage mechanism can be activated by pulling the lever on either brake lever to achieve coordinated braking between the front and rear brakes. The front and rear brakes combine drum brakes and hydraulic brakes, combining the advantages of both. Furthermore, a pressure regulating device is used to achieve pressure regulation anti-lock design for the hydraulic brakes. When the hydraulic oil pressure output by the brake pump exceeds the threshold, the pressure regulating device moves from the initial state to the terminated state, automatically limiting the transmission of oil pressure to the brake calipers and preventing the calipers from locking the wheels due to excessive pressure. This solution improves the ease of operation, provides reasonable distribution of braking force, and significantly enhances braking safety while improving braking efficiency. It can adapt to complex working conditions such as emergency braking, slippery roads, and long downhill slopes. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only involve some embodiments of this utility model, and are not intended to limit this utility model.

[0017] Figure 1 This is a three-dimensional assembly diagram of an embodiment of the anti-lock braking system with front and rear linkage of this utility model.

[0018] Figure 2 This is another perspective view of an embodiment of the anti-lock braking system with front and rear linkage of this utility model.

[0019] Figure 3 This is a schematic diagram of the system connection of an embodiment of the anti-lock braking system with front and rear linkage of this utility model.

[0020] Figure 4 This is a side view of the rear brake in one embodiment of the anti-lock braking system with front and rear linkage of this utility model.

[0021] Figure 5 This is an exploded view of the rear brake in one embodiment of the front-rear linkage anti-lock braking system of this utility model.

[0022] Figure 6 This is a diagram showing the brake grip force versus oil outlet pressure curve in one embodiment of the front-to-rear linkage anti-lock braking system of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. First brake lever; 11. First cable; 2. Second brake lever; 21. Second cable; 31. Oil reservoir; 32. Upper brake pump; 321. Piston; 322. Return spring; 33. Brake caliper; 34. Brake disc; 35. Oil pipe; 4. Pressure regulating device; 40. Pressure regulating chamber; 41. Pressure regulating piston; 42. Pressure regulating spring; 43. Flow regulating valve; 5. Drum brake assembly; 51. Drum; 52. Drum cover; 53. Brake pad; 54. Friction pad; 55. Elastic return element; 6. Pull rod device; 61. Pull rod body; 62. Swing block; 621. Pivot part; 622. Cable connection part; 63. First actuating part; 64. Second actuating part. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] Unless otherwise defined, the technical or scientific terms used in this patent document shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an," "a," or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or its equivalents, and do not exclude other elements or objects. Terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] This utility model provides a front-to-rear linkage anti-lock braking system. Its core innovation lies in achieving coordinated braking of drum brakes and hydraulic brakes through mechanical linkage, combined with hydraulic pressure adjustment technology to achieve the anti-lock function. The following detailed description of some embodiments of this utility model is provided with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0029] Please see Figures 1 to 6 As shown, this utility model provides a front-to-rear linked anti-lock braking system for braking bicycles, electric bicycles, motorcycles, etc. The braking system includes a first brake lever 1, a second brake lever 2, a drum brake assembly 5, a hydraulic brake assembly, and a lever device 6. The lever device 6 is associated with the drum brake assembly 5 and the hydraulic brake assembly. The first brake lever 1 and the second brake lever 2 are respectively connected to the lever device 6 via cables, so that the lever device 6 can be driven by either the first brake lever 1 or the second brake lever 2, or by both, to cause the drum brake assembly 5 and the hydraulic brake assembly to brake in a linked manner. The hydraulic brake assembly includes a brake upper pump 32 driven by the lever device 6, a brake caliper 33 for performing braking actions, and a pressure regulating device 4 disposed on the hydraulic oil flow path between the brake upper pump 32 and the brake caliper 33. The pressure regulating device 4 is configured to be driven by the hydraulic oil supplied by the brake upper pump 32 from an initial state to a terminated state, so as to limit the pressure of the hydraulic oil supplied by the brake upper pump 32 to the brake caliper 33 and prevent the brake caliper 33 from locking up.

[0030] The anti-lock braking system provided by this utility model is a front and rear linkage system. The lever device 6 can be moved by pulling any brake lever to achieve front and rear linkage braking. The front and rear brakes adopt a combination of drum brakes and hydraulic brakes, which combines the advantages of drum brakes and hydraulic brakes. Furthermore, a pressure regulating device 4 is used to realize the pressure regulating anti-lock design. When the hydraulic oil pressure output by the brake pump 32 exceeds the threshold, the pressure regulating device 4 moves from the initial state to the terminated state, automatically limiting the transmission of oil pressure to the brake caliper 33, preventing the caliper from locking the wheel due to excessive pressure. This solution improves the convenience of operation, the reasonable distribution of braking force, and significantly improves braking safety while improving braking efficiency. It can adapt to complex working conditions such as emergency braking, wet and slippery roads, and long downhill slopes.

[0031] Please see Figures 1 to 3 As shown, this braking system mainly includes a first brake lever 1, a second brake lever 2, a drum brake assembly 5, a hydraulic brake assembly, and a lever device 6. The first brake lever 1 and the second brake lever 2 are connected to the lever device 6 via a first cable 11 and a second cable 21, respectively. The lever device 6 is also connected to the brake pads 53 of the drum brake assembly 5 and the brake booster 32 of the hydraulic brake assembly. This design allows the rider to simultaneously trigger the coordinated braking of the front and rear wheels by operating either brake lever with one hand, significantly improving operational efficiency in emergency situations.

[0032] In one specific embodiment, the first brake lever 1 and the second brake lever 2 are, respectively, the left brake lever and the right brake lever of the bicycle. The drum brake assembly 5 is installed at the rear wheel hub of the bicycle as the rear brake, and the hydraulic brake is used as the front brake of the bicycle.

[0033] Please see Figure 4 and Figure 5 As shown, the hydraulic brake assembly includes a reservoir 31, a brake booster 32, a brake caliper 33, a brake disc 34, and a pressure regulating device 4. The reservoir 31 supplies hydraulic oil to the system and stores hydraulic oil during the hydraulic oil return phase. In this embodiment, the reservoir 31 is transparent, allowing for easy observation of the hydraulic oil level inside. The outlet chamber of the brake booster 32 is connected to the brake caliper 33 via an oil pipe 35. The brake booster 32 has a cylinder containing a piston 321 and a return spring 322. When the piston 321 is pushed by the pull rod device 6, the brake booster 32 delivers hydraulic oil to the brake caliper 33 via the oil pipe 35, driving the brake caliper 33 to clamp the brake disc 34, generating braking force.

[0034] The voltage regulating device 4 is a core component of the anti-lock braking function; its structure is detailed in the following section. Figure 3 As shown, the device includes a pressure regulating chamber 40, a pressure regulating piston 41, a pressure regulating spring 42, and a flow regulating valve 43. The pressure regulating device 4 has an initial state and a termination state. The pressure regulating device 4 is configured to: maintain the initial state when the pressure of the hydraulic oil supplied by the brake upper pump 32 does not reach a preset threshold; and move from the initial state to the termination state when the pressure of the hydraulic oil supplied by the brake upper pump 32 reaches the preset threshold, to prevent seizure. Specifically, the pressure regulating piston 41 is movably disposed within the pressure regulating chamber 40 and is elastically abutted by the pressure regulating spring 42. The hydraulic oil supplied by the brake upper pump 32 acts on the pressure regulating piston 41, and when its force can overcome the elastic force of the pressure regulating spring 42, the pressure regulating piston 41 moves within the pressure regulating chamber 40.

[0035] The pressure regulating chamber 40 is filled with a fluid medium, which can be discharged in a restricted manner through the flow regulating valve 43 to regulate the pressure of the oil outlet chamber of the brake pump 32. In this embodiment, the fluid in the pressure regulating chamber 40 can be a gas, such as air, and the opening of the flow regulating valve 43 is adjustable, thus changing the gas discharge rate and thereby changing the pressure holding time.

[0036] Please see Figure 6 As shown, when the user operates any brake lever, the hydraulic oil pressure output by the brake upper pump 32 begins to increase but does not reach the preset threshold. The pressure regulating piston 41 remains in its initial position under the action of the pressure regulating spring 42. During this process, all the hydraulic oil squeezed out by the brake upper pump 32 flows to the brake caliper 33. The gripping force of the brake lever and the pressure of the brake caliper 33 have a positive linear relationship, as shown... Figure 6 As shown in the first sloping segment of the curve; when the pressure reaches a threshold sufficient to overcome the elastic force of the pressure regulating spring 42, the hydraulic oil will push the pressure regulating piston 41 to move within the pressure regulating chamber 40. During this process, the hydraulic oil supplied by the brake upper pump 32 replenishes the space vacated by the downward movement of the pressure regulating piston 41, and is not further applied to the brake caliper 33. Therefore, the braking force remains unchanged, achieving a relatively stable pressure holding pressure and preventing the brake caliper 33 from over-braking. Figure 6 The middle horizontal line segment of the curve is shown; when the pressure regulating piston 41 moves to contact the end face of the pressure regulating chamber 40 and can no longer move, this is the terminated state. After this, if the brake lever is gripped tightly again, the hydraulic oil supplied by the brake pump 32 is squeezed out and flows to the brake caliper 33. The gripping force of the brake lever and the braking force are again in a positive linear relationship, as shown in the figure. Figure 6 The second oblique segment of the middle curve is shown.

[0037] Please see Figure 5 As shown, the drum brake assembly 5 is mounted on the rear wheel. The drum brake assembly 5 includes a brake drum, brake blocks 53, and an elastic return member 55 that applies elastic force to the brake blocks 53. The brake drum includes a drum cylinder 51 and a drum cylinder cover 52. The drum cylinder cover 52 covers the drum cylinder 51 to form a hollow space. The brake blocks 53, friction pads 54, and elastic return member 55 are disposed within the hollow space of the brake drum. In this embodiment, there are two brake blocks 53 with an arc-shaped structure. One end of each brake block 53 is pivotally connected to the drum cylinder cover 52, and the other end can rotate relative to the pivoting end to achieve relative expansion and contraction movement of the two brake blocks 53. There are also two friction pads 54, which are disposed between the brake blocks 53 and the inner wall surface of the drum cylinder 51. The elastic return member 55 applies a pulling force between the two brake blocks 53 so that when the two brake blocks 53 are not actuated by the pull rod device 6, they are in a contracted state and remain detached from the inner wall surface of the drum cylinder 51.

[0038] Please see Figures 3 to 5As shown, the lever device 6 is configured to swing about a predetermined pivot axis. The lever device 6 includes a first actuating part 63 coaxially disposed with the pivot axis, which rotates about the pivot axis to drive the drum brake assembly 5 to brake. The lever device 6 also includes a second actuating part 64 that swings about the pivot axis, and the second actuating part 64 abuts against the piston 321 of the brake upper pump 32 to drive the hydraulic brake assembly to brake.

[0039] Specifically, the first actuating part 63 is a cam shaft fixedly connected to the pull rod body 61. The end of the cam shaft is flat and extends through the drum cover 52 into the brake drum, where it is clamped between the separable ends of the two brake blocks 53. When the pull rod body 61 is pulled to swing, the first actuating part 63 rotates around the pivot axis, driving the brake blocks 53 to squeeze the brake drum. Specifically, the cam shaft rotates around its own axis, i.e., the set axis, causing the flat end of the cam shaft to move from a horizontally flattened position to a vertically flattened position, thereby opening the two brake blocks 53 and causing the brake blocks 53 to expand to squeeze the drum 51 through the friction pads 54 to achieve friction braking. The second actuating part 64 is a push rod connected to the pull rod body 61. When the pull rod body 61 is pulled to swing, the push rod swings around the pivot axis to press against the piston 321 of the brake upper pump 32 to drive the hydraulic brake assembly to brake.

[0040] In this embodiment, the lever device 6 includes a lever body 61 and a swing block 62. The swing block 62 includes a pivot portion 621 and two cable connection portions 622 respectively disposed on both sides of the pivot portion 621. The swing block 62 is pivotally connected to the lever body 61 via the pivot portion 621. The first brake lever 1 and the second brake lever 2 are respectively connected to the cable connection portions 622 via cables, allowing the swing block 62 to swing relative to the lever body 61 within a set angle range. That is, the swing block 62 is pivotally connected to the lever body 61 via the pivot portion 621, and two cable connection portions 622 are symmetrically arranged on both sides of the pivot portion 621. The first cable 11 and the second cable 21 are respectively fixed to the two cable connection portions 622, allowing the swing block 62 to swing relative to the lever body 61 within a certain angle range. The oscillating block 62 reduces the impact on the tension of the other cable when one of the first cable 11 or the second cable 21 pulls the lever body 61. That is, when only one of the first cable 11 or the second cable 21 is tensioned, the oscillating block 62 can oscillate at a small angle relative to the lever body 61 to reduce interference with the state of the other cable. Understandably, the cable structure used in bicycle braking systems is a well-known technology in the art, typically a Bowden cable, which transmits motion over long distances by having an internal metal core slide within an external protective sheath.

[0041] In this embodiment, the lever device 6, the brake upper pump 32, and the pressure regulating device 4 are all mounted on the drum brake assembly 5. Specifically, the cylinders of the brake upper pump 32 and the pressure regulating device 4 are both formed on the drum cover 52 of the drum brake assembly 5 and are interconnected. The pistons, springs, and other components of the brake upper pump 32 and the pressure regulating device 4 are correspondingly assembled in their respective cylinders. Of course, in other embodiments, the cylinders of the brake upper pump 32 and the pressure regulating device 4 can also be mounted on the drum cover 52. This embodiment integrates the lever device 6 and the brake upper pump 32 onto the drum cover 52 of the drum brake assembly 5. This compact design significantly reduces the space occupied by the system, making it particularly suitable for bicycles, motorcycles, electric vehicles, and other models where installation size is sensitive. At the same time, the pressure regulating device 4 is directly fixed to the drum cover 52, and its oil circuit is integrated with the cylinder of the brake upper pump 32, avoiding the complex layout of external pipelines and reducing the risk of hydraulic oil leakage.

[0042] In use, when the rider holds either brake lever or both brake levers simultaneously, the cable pulls the lever body 61 to rotate, causing the first actuator 63 and the second actuator 64 connected to the lever body 61 to move. The first actuator 63 is driven to the brake block 53 of the drum brake assembly 5, while the second actuator 64 abuts against the piston 321 of the brake upper pump 32. This dual-actuator design ensures high efficiency of mechanical transmission. The rotation of the first actuator 63 directly drives the drum brake, while the movement of the second actuator 64 triggers the hydraulic braking of the oil brake system, realizing coordinated braking of the front and rear wheels, enabling fast and smooth braking.

[0043] When the vehicle speed is too high or during a long downhill slope, when the braking force reaches the set threshold, the pressure regulating device 4 automatically intervenes. Specifically, the pressure regulating piston 41 is driven by hydraulic oil to move within the pressure regulating chamber 40. The piston 41 compresses the air within the chamber and discharges it through the flow regulating valve 43. Changing the outlet size of the flow regulating valve 43 controls the air discharge speed, thereby adjusting the movement speed of the piston 41. This, in turn, changes the time it takes for the piston 41 to move from its initial position to the bottom wall of the chamber 40, creating a delay time. During this delay, the pressure of the brake caliper 33 remains stable due to the movement of the piston 41. This prevents a rapid increase in pressure caused by excessive grip on the brake lever, which could lead to excessive braking force and wheel lock-up, resulting in dangerous situations such as wheel spin or skidding. Once the piston 41 reaches its lowest point, the pressure supplied to the brake caliper 33 by the brake booster 32 returns to a linear relationship with the user's grip on the brake lever. Each braking process involves a three-stage braking force profile: "hard-soft-hard," which avoids excessive gripping force during emergency braking, thus improving braking smoothness and safety.

[0044] As can be seen from the above description of specific embodiments, this utility model solves the core pain points of traditional braking systems, such as complex operation, unreasonable distribution of braking force, and easy lock-up, through the deep integration of mechanical linkage and hydraulic pressure adjustment technology, and provides a highly efficient, safe, and adaptable braking solution for cycling vehicles.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An antilock braking system for braking a riding vehicle, comprising a front brake lever, a rear brake lever, a drum brake assembly and an oil brake assembly, characterized in that, The braking system further includes a lever assembly associated with the drum brake assembly and the hydraulic brake assembly. A first brake lever and a second brake lever are respectively connected to the lever assembly via cables, so that either the first brake lever or the second brake lever, or both, drive the lever assembly to move, thereby causing the drum brake assembly and the hydraulic brake assembly to brake in tandem. The hydraulic brake assembly includes a brake upper pump driven by the lever assembly, a brake caliper for performing braking actions, and a pressure regulating device disposed in the hydraulic oil flow path between the brake upper pump and the brake caliper. The pressure regulating device is configured to be driven from an initial state to a terminated state by the hydraulic oil supplied by the brake upper pump, thereby limiting the pressure of the hydraulic oil supplied by the brake upper pump to the brake caliper and preventing the brake caliper from locking up.

2. The antilock braking system according to claim 1, wherein The tie rod device and the upper brake pump are mounted on the drum brake assembly.

3. The anti-lock braking system with front and rear linkage as described in claim 2, characterized in that, The lever device is configured to swing about a set pivot axis, and the lever device includes a first actuation part coaxially disposed with the pivot axis, the first actuation part rotating about the pivot axis to drive the drum brake assembly to brake.

4. The anti-lock braking system with front and rear linkage as described in claim 3, characterized in that, The drum brake assembly includes a brake drum, a brake block, and an elastic reset member that applies an elastic force to the brake block. The first actuating part rotates about the pivot axis to drive the brake block to press against the brake drum.

5. The anti-lock braking system with front and rear linkage as described in claim 3, characterized in that, The lever assembly includes a second actuating part that oscillates about the pivot axis and abuts against the piston of the brake upper pump.

6. The anti-lock braking system with front and rear linkage as described in any one of claims 1 to 5, characterized in that, The lever device includes a lever body and a swing block. The swing block includes a pivot portion and two cable connection portions located on both sides of the pivot portion. The swing block is pivotally connected to the lever body through the pivot portion. The first brake lever and the second brake lever are respectively connected to the cable connection portions through cables, so that the swing block can swing relative to the lever body within a set angle range.

7. The anti-lock braking system with front and rear linkage as described in any one of claims 1 to 5, characterized in that, The pressure regulating device is configured on the drum brake assembly, and the pressure regulating device is connected to the cylinder of the brake upper pump.

8. The anti-lock braking system with front and rear linkage as described in any one of claims 1 to 5, characterized in that, The pressure regulating device is configured to: maintain the initial state when the pressure of the hydraulic oil supplied by the brake pump does not reach a preset threshold; and move from the initial state to the termination state when the pressure of the hydraulic oil supplied by the brake pump reaches the preset threshold.

9. The anti-lock braking system with front and rear linkage as described in claim 8, characterized in that, The pressure regulating device includes a pressure regulating chamber, a pressure regulating spring disposed in the pressure regulating chamber, and a pressure regulating piston movably disposed in the pressure regulating chamber. The pressure regulating spring elastically abuts against the pressure regulating piston, and the hydraulic oil supplied by the brake pump can drive the pressure regulating piston to move within the pressure regulating chamber against the elastic force of the pressure regulating spring.

10. The anti-lock braking system with front and rear linkage as described in claim 9, characterized in that, The pressure regulating chamber contains gas, and the pressure regulating device includes a flow regulating valve that connects to the pressure regulating chamber and can be used to regulate the gas flow rate.

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