Electric bicycle machine liquid mixed brake control device

Abstract

The utility model discloses an electric bicycle machine liquid mixes brake control device, including control valve body, the upper portion of control valve body sets up entity, and the lower part is equipped with the installation cavity, and the first oil cavity of connecting component sets up inside one side of entity, and the first piston sets up in the first oil cavity, and the first piston rod of its lower part extends the first oil cavity, and disc brake assembly sets up inside the other side of entity, and the lower part of disc brake assembly's second oil cavity is connected with the lower part of first oil cavity through oil channel, and the second piston rod of disc brake assembly extends the second oil cavity, the brake end of drum brake assembly is connected with the lower wall of first piston rod, and the brake end of drum brake assembly is connected with the lower wall of second piston rod, advantage: no matter left, right hand alone or two hands pinch brake wrench simultaneously, can realize front wheel and rear wheel brake simultaneously, and the braking force that front wheel and rear wheel obtained always keeps preset ratio, makes full use of vehicle front wheel and rear wheel and ground adhesion, effectively reduces the security risk of braking, and greatly improves the braking safety.

Description

Technical Field

[0001] This utility model relates to a braking device, specifically a hydraulic-mechanical hybrid braking control device for electric bicycles. Background Technology

[0002] Electric bicycles are a very common mode of transportation, which is of great significance for facilitating people's travel and promoting the development of green transportation. Now, more and more electric bicycles are gradually changing to a hybrid braking system that combines disc brakes on the front wheel and drum brakes on the rear wheel. Disc brakes on the front wheel provide better braking performance, while drum brakes on the rear wheel reduce costs. Taking into account both the technical and economic aspects of braking, the market share of electric bicycles is growing.

[0003] However, existing braking methods typically involve using the right hand to operate the front wheel brake and the left hand to operate the rear wheel brake (the left and right hands can be interchanged without any substantial difference). This makes it impossible to apply the brakes simultaneously and cannot guarantee that the braking force received by the front and rear wheels will maintain the preset ratio. During emergency braking, this can easily cause safety hazards such as vehicle skidding, fishtailing, rollover, and overturning. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing braking method cannot brake the front and rear wheels at the same time, and the braking force received by the front and rear wheels cannot be kept in a preset ratio, which poses a safety hazard during emergency braking; in order to solve the above problem, an electric bicycle hydraulic-mechanical hybrid braking control device is proposed, including a control valve body, with a solid body at the top and a hollow mounting cavity at the bottom.

[0005] The first oil chamber of the connecting assembly is located inside the solid on one side. The first piston is located in the first oil chamber. The lower part of the first piston is connected to the first piston rod. The first piston rod extends out of the solid. The first pressure spring is sleeved on the first piston rod and located between the lower wall of the first oil chamber and the first piston. A limiting block is provided on the first piston. The first cap is located on the top of the first oil chamber.

[0006] The disc brake assembly is located on the other side of the interior of the solid body. The lower part of the second oil chamber of the disc brake assembly is connected to the lower part of the first oil chamber through an oil passage. The second piston rod of the disc brake assembly extends out of the solid body.

[0007] The drum brake assembly is used to connect the brake end of the handbrake wrench to the lower wall of the first piston rod, and to connect the brake end of the drum brake rocker arm to the lower wall of the second piston rod.

[0008] The technical solution of this utility model, through the structure of the connecting components, connects the disc brake assembly and the drum brake assembly respectively. Whether the brake lever is held by the left or right hand alone or by both hands at the same time, the front and rear wheels can be braked simultaneously, and the braking force received by the front and rear wheels always maintains a preset ratio. It makes full use of the adhesion between the front and rear wheels of the vehicle and the ground, effectively reduces the safety hazards of braking, and greatly improves braking safety. Through the structure of the nylon baffle strip, it fits the edges of the first pulley and the second pulley from both sides to prevent the brake cable of the disc brake assembly from coming off during braking.

[0009] In a preferred embodiment of the present invention, a cover plate is provided on the outside of the mounting cavity and connected by bolts. The cover plate is used to close the mounting cavity and prevent damage to the internal structure.

[0010] In a preferred embodiment of the present invention, the disc brake assembly includes a second oil chamber disposed within the solid body. A second piston is disposed within the second oil chamber, dividing the second oil chamber into upper and lower chambers. Both the oil inlet and outlet are connected to the lower chamber of the second oil chamber via oil passages. The lower part of the second piston is connected to a second piston rod, which extends out of the lower chamber. A second cap is disposed at the top of the second oil chamber. A second pressure spring is disposed within the upper chamber and located between the second piston and the second cap. Brake fluid from the disc brake master cylinder enters the lower chamber through the oil inlet and then enters the disc brake slave cylinder through the oil outlet to complete disc brake braking. Simultaneously, it also compresses the second piston to move upward, thereby driving the brake end of the drum brake assembly to move upward. The second pressure spring is compressed, tightening the brake cable to complete drum brake braking. After braking is completed, the second pressure spring returns to its original state.

[0011] In a preferred embodiment of the present invention, the brake end includes a first bracket connected to a first piston rod. The first bracket is in the shape of an inverted "U" with its opening facing downwards. A first pulley is rotatably connected between the openings of the first bracket. The brake cable is wound around the first pulley half a turn. One end of the brake cable is connected to a brake cable retainer, which is located inside the mounting cavity. The other end of the brake cable extends out of the mounting cavity and is connected to the handbrake lever. When the handbrake lever is squeezed, the brake cable is pulled downwards, causing the first piston rod to move downwards. The first pressure spring is compressed, squeezing the brake fluid in the first oil chamber into the second oil chamber. Then, the second piston is squeezed upwards, thereby causing the brake end to move upwards. The second pressure spring is compressed, and the brake cable is tightened, completing the drum brake braking. At the same time, some brake fluid enters the disc brake cylinder through the outlet, completing the disc brake braking. After braking is completed, both the second and first pressure springs return to their original positions.

[0012] In a preferred embodiment of the present invention, the braking end includes a second bracket connected to a second piston rod. The second bracket is in the shape of an "U" with its opening facing downwards. A second pulley is rotatably connected between the openings of the second bracket. The brake cable is wound around the second pulley half a turn. One end of the brake cable is connected to a brake cable fixing clip, which is located inside the mounting cavity. The other end of the brake cable extends out of the mounting cavity and is connected to the drum brake rocker arm. The braking end has the same structure as the brake end, thus reducing manufacturing costs.

[0013] In a preferred embodiment of the present invention, an L-shaped nylon baffle is provided between the brake end and the braking end of the drum brake assembly and the side wall of the mounting cavity, and a T-shaped nylon baffle is provided between the brake end and the braking end. The nylon baffle is used to press down on the end faces of the first pulley and the second pulley and fit their edges to prevent the brake cable and the braking line from coming off.

[0014] The advantages of this utility model compared with the prior art are:

[0015] The technical solution of this utility model, through the structure of the connecting components, connects the disc brake assembly and the drum brake assembly respectively. Whether the brake lever is held by the left or right hand alone or by both hands at the same time, the front and rear wheels can be braked simultaneously, and the braking force received by the front and rear wheels always maintains a preset ratio. It makes full use of the adhesion between the front and rear wheels of the vehicle and the ground, effectively reduces the safety hazards of braking, and greatly improves braking safety. Through the structure of the nylon baffle strip, it fits the edges of the first pulley and the second pulley from both sides to prevent the brake cable of the disc brake assembly from coming off during braking. Attached Figure Description

[0016] Figure 1 A three-dimensional schematic diagram of a hydraulic-mechanical hybrid brake control device for an electric bicycle;

[0017] Figure 2 A schematic diagram showing the opening of the cover of a hydraulic-mechanical hybrid brake control device for an electric bicycle;

[0018] Figure 3 An exploded cross-section of a partial structure of an electric bicycle's hydraulic-mechanical hybrid brake control device with the cover removed;

[0019] The components are: 1-control valve body, 11-solid body, 12-mounting cavity, 13-cover plate, 2-disc brake assembly, 21-second oil chamber, 22-second piston, 23-second piston rod, 24-second pressure spring, 25-oil inlet, 26-oil outlet, 27-second cap, 3-drum brake assembly, 31-brake cable, 32-first pulley, 33-first bracket, 34-brake cable fixing clip, 35-brake cable, 36-second pulley, 37-second bracket, 38-brake cable fixing clip, 4-connecting assembly, 41-first oil chamber, 42-first piston, 43-first piston rod, 44-first pressure spring, 45-limiting block, 46-first cap, 5-nylon retaining strip. Detailed Implementation

[0020] The following will refer to the appendix in the embodiments of this utility model. Figure 1-3 The technical solutions in the embodiments of this utility model will be described in detail below. Example 1

[0021] like Figure 1-3 As shown, this utility model is a hybrid hydraulic brake control device for electric bicycles, including a control valve body 1, a disc brake assembly 2, a drum brake assembly 3, and a connecting assembly 4. The disc brake assembly 2, the drum brake assembly 3, and the connecting assembly 4 are all installed inside the control valve body 1. The disc brake assembly 2 and the drum brake assembly 3 are connected by the connecting assembly 4. Whether the left or right hand squeezes the brake lever alone or both hands squeeze at the same time, the front and rear wheels can be braked simultaneously, and the braking force received by the front and rear wheels always maintains a preset ratio, improving the safety during braking.

[0022] The upper part of the control valve body 1 is a solid 11, and the lower part is recessed to form a hollow mounting cavity 12. A cover plate 13 is provided on the outside of the mounting cavity 12 and connected by bolts. The cover plate 13 is used to close the mounting cavity 12 to prevent its internal structure from being damaged. After the cover plate 13 is closed, the control valve body 1 is a square block with two protruding sides forming fixing ears. The fixing ears are recessed to form through holes. The control valve body can be fixed to the electric bicycle by bolts.

[0023] The control valve body 1 can be made of hard aluminum alloy by pressing, or it can be made of stainless steel or alloy carbon steel. The former can save costs, while the latter has higher strength and stability.

[0024] The first oil chamber 41 is formed inside the solid 11 of the control valve body 1 by machining. The first oil chamber 41 is cylindrical. The first cap 46 is threaded to the top of the first oil chamber 41 to seal the first oil chamber 41 from above. The bottom of the first oil chamber 41 is also threaded to the lower cap and sealed. The first piston 42 and the first piston rod 43 connected to its lower part are integrally formed. The first piston 42 is slidably connected in the first oil chamber 41. The first piston rod 43 passes through the lower cap and is located in the mounting cavity 12 below the solid 11. The first pressure spring 44 is sleeved on the first piston rod 43 and is in contact with the lower wall of the first oil chamber 41 and the first piston 42 respectively. A cylindrical limiting block 45 is placed between the first piston 42 and the first cap 46. The limiting block 45 is preferably made of rubber.

[0025] The other side of the body 11 of the control valve body 1 is machined by a machine tool to form a second oil chamber 21. The second oil chamber 21 is also cylindrical. The second cap 27 is threaded to the top of the second oil chamber 21 to close the second oil chamber 21 from above. The bottom of the second oil chamber 21 is also threaded to the bottom cover and closed. The second piston 22 and the second piston rod 23 connected to its lower part are integrally formed. The second piston 22 is slidably connected in the second oil chamber 21. The second piston rod 23 passes through the lower cover and is located in the mounting cavity 12 below the body 11.

[0026] The second piston 22 divides the second oil chamber 21 into upper and lower chambers, and the second pressure spring 24 is placed between the second piston 22 and the second cap 27.

[0027] A transverse oil passage is formed on the side of the control valve body 1 that is biased towards the second oil chamber 21 by machine tool processing. The transverse oil passage runs through and connects the lower chamber of the second oil chamber 21 and the lower part of the first oil chamber 41. The outer end of the transverse oil passage is locked and sealed by a threaded connection bolt to prevent brake fluid leakage. On the upper part of the control valve body 1, between the second oil chamber 21 and the first oil chamber 41, a vertical oil passage is formed by machine tool processing. This oil passage is connected to the transverse oil passage, and the outer end of this oil passage is threadedly connected to the oil inlet 25. The oil inlet 25 is connected to the disc brake master cylinder of the existing electric bicycle through a pipe. On the other side of the second oil chamber 21, another vertical oil passage is formed by machine tool processing. This oil passage is connected to the transverse oil passage, and the outer end of this oil passage is threadedly connected to the oil outlet 26. The oil outlet 26 is connected to the disc brake slave cylinder of the existing electric bicycle through a pipe.

[0028] During the movement of the first piston 42 and the second piston 22, the lateral oil passage is always located below its lower wall, so it will not be blocked or clogged, causing the brake fluid to be unable to flow and affecting the normal operation of the device.

[0029] The integral molding of the piston rod and the piston can be made of alloy steel. Its cylindrical surface requires high machining precision and roughness to ensure a certain airtightness. A sealing ring can also be provided on the side wall of the piston to further enhance the airtightness. A sealing ring is also provided on the side wall surface where the piston rod fits with the lower cover to enhance the airtightness. And the lower cover has a proper thickness to ensure that the piston rod does not sway left and right when moving up and down; the oil inlet 25 and the oil outlet 26 are both connecting pipe fittings, and the material is preferably carbon steel or stainless steel, which are existing products.

[0030] The drum brake assembly 3 includes a braking end connected to the handbrake wrench and a braking end connected to the drum brake rocker arm. The braking end includes a first bracket 33. The first bracket 33 is threadedly connected to the bottom of the first piston rod 43. The specific connection method is as follows: A slotted hole can be opened at the upper end of the first piston 42, and the first bracket 33 is clamped to the first piston rod 43. Then, hold down the first bracket 33, insert a tool such as a screwdriver from the upper part of the first oil cavity 41 and catch the slotted hole to twist, and fix and lock the first piston rod 43 to the first bracket by threading.

[0031] The first bracket 33 is in a "C" shape, with its opening facing downwards. The first pulley 32 is rotatably connected between the openings of the first bracket 33. The end face of the first pulley 32 faces outwards. The brake cable 31 winds around the first pulley 32 for half a turn. One end of the brake cable 31 is connected to the brake cable fixed clamp 34 fixed to the bottom of the installation cavity 12, and the other end of the brake cable 31 extends out of the installation cavity 12 and is connected to the handbrake wrench.

[0032] The braking end has the same structure as the braking end, and the structures of each part are only distinguished in name. The braking end includes a second bracket 37. The second bracket 37 is threadedly connected and locked to the second piston rod 23. The specific connection method is the same as the above method. The second bracket 37 is in a "C" shape, with its opening facing downwards. The cross-section of the second pulley 36 faces outwards and is rotatably connected to the second bracket 37. The brake line 35 winds around the second pulley 36 for half a turn. One end of the brake line 35 is connected to the brake line fixed clamp 38. The brake line fixed clamp 38 is fixed to the lower side inside the installation cavity 12. The other end of the brake line 35 extends out of the installation cavity 12 and is connected to the drum brake rocker arm. The above brake cable 31 and brake line 35 are standard brake flexible cables, which are existing products. The pulleys and fixed clamps all belong to the conventional technologies in this field and can be directly purchased from the market.

[0033] Such as Figure 3As shown, when the handbrake lever is squeezed to complete braking, brake fluid flows through the second oil chamber 21 in the transverse oil passage, squeezing the second piston 22 upwards. The second piston rod 23 then moves upwards, tightening the brake cable 35 to complete drum brake braking. Simultaneously, some brake fluid enters the disc brake caliper through the outlet 26, pushing the disc brake caliper piston to complete disc brake braking. Only when the rear wheel drum brake is activated, i.e., when the brake cable 35 is taut and the second piston 22 stops moving, can the oil pressure in the second oil chamber 21 increase as the handbrake lever is further squeezed. At this time, the oil pressure is P. The same principle applies when squeezing the left and right handbrake levers.

[0034] Because the center of gravity of an electric bicycle is slightly rearward and the seat is also positioned far back, the positive pressure on the rear wheel is greater. When braking, the braking force distributed to the rear wheel is greater than that of the front wheel. This allows for full utilization of the adhesion between the rear wheel and the ground, improving braking efficiency and increasing safety during braking.

[0035] The rear wheel drum brake is braked by the tension of the brake cable 35, which is f. As can be seen from the figure, the tension of the brake cable 35 pulled by the second piston rod 23 is F1=2f, and F1=PS2, where S2 is the area of ​​the lower ring of the second piston 22. The front wheel disc brake completes disc brake braking by pulling the piston of the disc brake caliper, with a tension of F2=PS1, where S1 is the piston area of ​​the disc brake caliper. The braking force of the rear wheel is greater than that of the front wheel, so S2>2S1, that is, the area of ​​the lower ring of the second piston 22 is greater than twice the piston area of ​​the disc brake caliper.

[0036] Preferably, S2 and S1 can be designed in a certain proportion to meet the above requirements, so that the braking force received by the front and rear wheels is also in a certain proportion.

[0037] Multiple nylon baffles 5 are also provided inside the mounting cavity 12. The nylon baffles 5 should preferably be made of materials such as nylon 6. The nylon baffles 5 between the brake end and the side wall of the mounting cavity 12 and between the brake end and the side wall of the mounting cavity 12 have an "L" shaped cross section with a slight interference in their vertical length. They are inserted into the mounting cavity 12. One side of the "L" shaped nylon baffle 5 is attached to the end face of the pulley, and the other side is attached to the edge of the side wall of the pulley. The nylon baffle 5 between the brake end and the brake end has a "T" shaped cross section with a slight interference in its vertical length. The two side walls of the middle part of the "T" shaped nylon baffle 5 are attached to the side wall of the pulley, and the upper part is attached to the end face of the pulley. Before installing the cover plate 13, the nylon baffles 5 are inserted into it to prevent the brake line 31 or brake line 35 from coming off the pulley when the drum brake is applied.

[0038] The method of using the electric bicycle hydraulic-mechanical hybrid brake control device in this embodiment is as follows:

[0039] Since there is no substantial difference in which side of the handbrake wrench controls the braking of the front and rear wheels, this explanation will focus on the right disc brake and the left drum brake. The control valve body 1 is fixed to the existing electric bicycle with bolts. The existing disc brake master cylinder is connected to the oil inlet 25 through a pipe, and the existing disc brake slave cylinder is connected to the oil outlet 26 through a pipe. The standard brake cable of the existing drum brake assembly 3 is removed. The brake cable 31 is connected to the handbrake wrench that controls the drum brake assembly 3, and the brake cable 35 is connected to the drum brake rocker arm controlled by the drum brake assembly 3.

[0040] When the right-side handbrake lever is squeezed, it activates the disc brake master cylinder. Brake fluid from the master cylinder enters the oil passage through inlet 25. Since the piston in the first oil chamber 41 is in close contact with the limit block 45, the brake fluid can only enter the lower chamber of the second oil chamber 21. Then, it passes through the oil passage and enters the disc brake slave cylinder through outlet 26, thus completing the disc brake braking process. Simultaneously, the increased brake fluid in the second oil chamber 21 compresses the second piston 22, causing it to move upward and compress the second pressure spring 24. The second piston rod 23 moves upward, which in turn moves the brake end upward, tightening the brake cable 35. The drum brake rocker arm rotates, simultaneously completing the drum brake braking. After braking is complete, the handbrake lever is released, the brake fluid returns to its original position, and the second pressure spring 24 also returns to its original position.

[0041] When the left-handbrake lever is squeezed, the brake cable 31 is tightened, causing the brake end to move downwards. The first pressure spring 44 is compressed, and the first piston 42 squeezes the brake fluid in the first oil chamber 41 into the second oil chamber 22, increasing the amount of brake fluid in the second oil chamber 21. Then, the second piston 22 is squeezed upwards, at which point the second pressure spring 24 is compressed, and the second piston 23 also moves upwards, thereby causing the brake end to move upwards. The brake cable 35 is tightened, and the drum brake rocker arm rotates, completing the drum brake braking. Meanwhile, some brake fluid enters the disc brake cylinder through the oil passage from the oil outlet 26, thus completing the disc brake braking process. After braking is completed, the handbrake lever is released, the first pressure spring 44 returns to its original position, and the brake end also returns to its original position. The squeezed-out brake fluid returns to the first oil chamber 41, the second pressure spring 24 returns to its original position, and the second oil chamber 22 and the brake end also return to their original state.

[0042] When both brake levers are squeezed simultaneously, the working principle is the superposition of the individual actions mentioned above, and the braking force and braking efficiency are both the sum of the individual actions. Therefore, whether the left or right hand squeezes the brake levers alone or both hands squeeze them simultaneously, the front and rear wheels can be braked at the same time. Furthermore, since both the disc brake assembly 2 and the drum brake assembly 3 are controlled synchronously by hydraulic pressure, the braking force received by the front and rear wheels always maintains a preset ratio, making braking safer and reducing safety hazards.

[0043] The above embodiments are only for illustrating the technical concept of this utility model and should not be used to limit the protection scope of this utility model. Any modifications made to the technical solution based on the technical concept proposed by this utility model shall fall within the protection scope of this utility model.

Claims

1. A hybrid hydraulic brake control device for electric bicycles, characterized in that: It includes a control valve body (1). An entity (11) is provided at the upper part of the control valve body (1), and a hollow installation cavity (12) is provided at the lower part. The first oil chamber (41) of the connection component (4) is arranged on one inner side of the entity (11). The first piston (42) is arranged in the first oil chamber (41). The lower part of the first piston (42) is connected to the first piston rod (43). The first piston rod (43) extends out of the entity (11). The first pressure spring (44) is sleeved on the first piston rod (43) and is located between the lower wall of the first oil chamber (41) and the first piston (42). A limiting block (45) is arranged on the first piston (42), and the first cap (46) is arranged at the top of the first oil chamber (41). The disc brake assembly (2) is arranged on the other inner side of the entity (11). The lower part of the second oil chamber (21) of the disc brake assembly (2) is connected to the lower part of the first oil chamber (41) through an oil passage. The second piston rod (23) of the disc brake assembly (2) extends out of the entity (11). The drum brake assembly (3) is used to connect the braking end of the handbrake wrench to the lower wall of the first piston rod (43), and is used to connect the braking end of the drum brake rocker arm to the lower wall of the second piston rod (23).

2. The electric bicycle hydraulic-mechanical hybrid brake control device according to claim 1, characterized in that: A cover plate (13) is arranged on the outer side of the installation cavity (12) and is connected by bolts.

3. The electric bicycle hydraulic-mechanical hybrid brake control device according to claim 1, characterized in that: The disc brake assembly (2) includes a second oil chamber (21). The second oil chamber (21) is arranged in the entity (11). The second piston (22) is arranged in the second oil chamber (21). The second piston (22) divides the second oil chamber (21) into upper and lower cavities. The oil inlet (25) and the oil outlet (26) are both connected to the lower cavity of the second oil chamber (21) through an oil passage. The lower part of the second piston (22) is connected to the second piston rod (23). The second piston rod (23) extends out of the lower cavity. The second cap (27) is arranged at the top of the second oil chamber (21). The second pressure spring (24) is arranged in the upper cavity and is located between the second piston (22) and the second cap (27).

4. The electric bicycle hydraulic-mechanical hybrid brake control device according to claim 1, characterized in that: The braking end includes a first bracket (33). The first bracket (33) is connected to the first piston rod (43). The first bracket (33) is in an "L" shape with the opening facing downwards. The first pulley (32) is rotatably connected between the openings of the first bracket (33). The brake wire (31) winds around the first pulley (32) for half a turn. One end of the brake wire (31) is connected to the brake wire fixed clamp (34). The brake wire fixed clamp (34) is arranged in the installation cavity (12). The other end of the brake wire (31) extends out of the installation cavity (12) and is connected to the handbrake wrench.

5. The electric bicycle hydraulic-mechanical hybrid brake control device according to claim 1, characterized in that: The braking end includes a second bracket (37). The second bracket (37) is connected to the second piston rod (23). The second bracket (37) is in an "L" shape with the opening facing downwards. The second pulley (36) is rotatably connected between the openings of the second bracket (37). The brake cable (35) winds around the second pulley (36) for half a turn. One end of the brake cable (35) is connected to the brake cable fixed clamp (38). The brake cable fixed clamp (38) is arranged in the installation cavity (12). The other end of the brake cable (35) extends out of the installation cavity (12) and is connected to the drum brake rocker arm.

6. The electric bicycle hydraulic-mechanical hybrid brake control device according to claim 1, characterized in that: The drum brake assembly (3) has "L" shaped nylon baffles (5) between the brake end and the side wall of the mounting cavity (12), and "T" shaped nylon baffles (5) between the brake end and the side wall of the mounting cavity (12).

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