Linkage brake assembly and electric tricycle

Abstract

The utility model relates to the technical field of electro-tricycle braking, in particular to a linkage braking assembly and an electro-tricycle. The linkage brake assembly comprises a linkage valve, the linkage valve comprises a valve body, a first elastic piece and a transmission structure, the valve body is provided with a first containing cavity used for containing hydraulic oil, and a plunger structure is connected into the first containing cavity in a sliding mode. According to the utility model, by treading the pedal plate, the pedal plate drives the plunger structure to move through the transmission structure, and hydraulic oil in the first chamber is extruded to finish pressure buildup from the first oil outlet pump to the oil path input port of the front disc brake; the hydraulic oil in the second cavity is extruded to complete pressure buildup from the second oil outlet pump to the oil way input port of the rear drum brake, due to the arrangement of the first sealing structure and the second sealing structure, the first cavity and the second cavity are not communicated with each other, even if pressure buildup of one oil way fails, operation of the other oil ways cannot be affected, and the service life of the rear drum brake is prolonged. And the safety is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric tricycle brake technical field, concretely relates to a linkage brake assembly and electric tricycle. BACKGROUND

[0002] At present, the electric tricycle has a footboard, a first hand brake, a second hand brake, a front disc brake, a rear drum brake and a linkage valve, the linkage valve includes a valve body, a cavity with one end opening is arranged in the valve body, a hydraulic plug is located in the cavity, the hydraulic plug seals the opening, hydraulic oil is injected in the cavity, an oil outlet is arranged on the side wall of the valve body and communicates with the cavity, three oil pipes are arranged on the oil outlet and are connected with the oil inlet of two rear drum brakes and the oil inlet of a front disc brake respectively, one end of the hydraulic plug is connected with the footboard through a jacking rod structure, the other end of the hydraulic plug is connected with an elastic element, when braking is needed, the user steps on the footboard, moves the hydraulic plug through the jacking rod structure, the elastic element is compressed, the hydraulic oil in the cavity is pumped into the three oil pipes, so that the rear drum brake and the front disc brake brake at the same time.

[0003] But the above-mentioned mode is through the same cavity to discharge oil, so when one of the oil paths fails to build pressure, the pressure in the cavity is affected, and then other oil paths are also likely to fail to build pressure, so that the front disc brake fails or the rear drum brake fails, thus having certain safety hazards. UTILITY MODEL CONTENTS

[0004] (I) The problem to be solved by the utility model is how to make the remaining oil paths not be affected when one of the oil paths fails, and improve safety.

[0005] (II) TECHNICAL SCHEME

[0006] The linkage brake assembly provided by the utility model is used for an electric tricycle, the electric tricycle includes a front disc brake, a rear drum brake, a first hand brake, a second hand brake, a jacking rod structure and a footboard, the linkage brake assembly includes a linkage valve, and the linkage valve includes a valve body, a first elastic element and a transmission structure.

[0007] The valve body has a first containing cavity for containing hydraulic oil, and a plunger structure is slidably connected in the first containing cavity.

[0008] One end of the plunger structure is provided with the first elastic element, and the other end of the plunger structure is connected with the footboard through the transmission structure.

[0009] The first sealing structure and the second sealing structure are arranged between the first accommodating cavity and the plunger structure, and are used for filling the gap between the plunger structure and the side wall of the first accommodating cavity, so as to divide the first accommodating cavity into a first chamber, a second chamber and a third chamber.

[0010] The first chamber is communicated with a first oil outlet on one side, which is used for being communicated with the oil path input port of the front disc brake.

[0011] According to an embodiment of the utility model, the plunger structure includes first plunger and second plunger which are arranged in sequence, and the transmission structure includes third plunger.

[0012] One end of the first plunger is abutted against the inner wall of the first chamber through the first elastic piece, and the first plunger and the second plunger are connected through the second elastic piece.

[0013] The first sealing structure is arranged on the first plunger, and the second sealing structure is arranged on the second plunger.

[0014] The third plunger is connected with the second plunger, and the third plunger is connected with the pedal through the top rod structure.

[0015] According to an embodiment of the utility model, one end of the third chamber is provided with a first opening, a ring groove is arranged at the first opening, a retaining ring is arranged in the ring groove, and one end of the third plunger, which is away from the second plunger, is abutted against the retaining ring.

[0016] According to an embodiment of the utility model, a third sealing structure is arranged on the third plunger, and the third sealing structure is used for filling the gap between the first opening and the third plunger.

[0017] The valve body further has a second accommodating cavity for accommodating hydraulic oil, and a fourth plunger is slidably connected in the second accommodating cavity.

[0018] The fourth plunger and the second accommodating cavity are provided with a fourth sealing structure and a fifth sealing structure, and the fourth sealing structure and the fifth sealing structure are used for filling the gap between the side wall of the fourth plunger and the side wall of the second accommodating cavity, so as to divide the second accommodating cavity into a fourth chamber, a fifth chamber and a sixth chamber.

[0019] One end of the fourth plunger is abutted against the inner wall of the sixth chamber, and the other end of the fourth plunger is provided with a third elastic piece, the third elastic piece is located in the fourth chamber, and the fourth chamber and the third chamber are communicated through a connecting hole.

[0020] The fifth chamber is communicated with a first oil inlet for communicating with an oil outlet of the first hand brake;

[0021] The sixth chamber is communicated with a second oil inlet for communicating with an oil outlet of the second hand brake.

[0022] According to an embodiment of the present application, the first plunger comprises a first cylinder and two first limiters;

[0023] The first sealing structure comprises a first sealing ring and a second sealing ring;

[0024] The two first limiters are respectively used for limiting the first sealing ring and the second sealing ring to move along the length direction of the first cylinder.

[0025] According to an embodiment of the present application, the linkage brake assembly comprises a first oil outlet pipe and a second oil outlet pipe;

[0026] The first oil outlet pipe is fixedly arranged on the first oil outlet through a first bolt, and a first through hole for communicating the first oil outlet pipe and the first oil outlet is arranged in the first bolt;

[0027] The second oil outlet pipe is fixedly arranged on the second oil outlet through a second bolt, and a second through hole for communicating the second oil outlet pipe and the second oil outlet is arranged in the second bolt.

[0028] According to an embodiment of the present application, the linkage valve further comprises a plug, one end of the fourth chamber is provided with a second opening, and the plug is sealingly connected at the second opening.

[0029] According to an embodiment of the present application, the valve body comprises a first machining opening, the first machining opening is communicated with the connecting hole, and a third bolt is screwed in the first machining opening.

[0030] According to an embodiment of the present application, an oil injection hole is arranged on the valve body for oil injection.

[0031] An electric tricycle comprises any one of the linkage brake assemblies.

[0032] The present application has the following beneficial effects:

[0033] Pedal, pedal through the transmission structure drives the plunger structure, the first chamber of hydraulic oil is extruded from the first oil outlet pump to the front disc brake oil path input port to complete the build pressure, the second chamber of hydraulic oil is extruded from the second oil outlet pump to the rear drum brake oil path input port to complete the build pressure, due to the setting of the first sealing structure and the second sealing structure, and the first chamber and the second chamber are not communicated with each other, even if one of the oil paths fails, it will not affect the operation of the other oil path, and the safety is higher. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0035] Figure 1 The three-dimensional view of the linkage brake assembly provided by the embodiment of the utility model is shown in the figure.

[0036] Figure 2 The cross-sectional view of the linkage brake assembly provided by the embodiment of the utility model is shown in the figure.

[0037] Figure 3 The cross-sectional view of the valve body provided by the embodiment of the utility model is shown in the figure.

[0038] Figure 4 The three-dimensional view of the plunger structure, the first sealing structure, the second sealing structure and the third plunger provided by the embodiment of the utility model is shown in the figure.

[0039] Icon: 1, valve body; 101, first oil outlet; 102, second oil outlet; 103, first oil inlet; 104, second oil inlet; 105, oil injection hole; 2, first containing cavity; 3, first elastic member; 4, first sealing structure; 401, first sealing ring; 402, second sealing ring; 5, second sealing structure; 6, first chamber; 7, second chamber; 8, third chamber; 9, first plunger; 901, first cylinder; 902, first limiting member; 10, second plunger; 11, third plunger; 12, second elastic member; 13, ring groove; 14, second containing cavity; 15, fourth plunger; 16, third elastic member; 17, fourth sealing structure; 18, fifth sealing structure; 19, fourth chamber; 20, fifth chamber; 21, sixth chamber; 22, connecting hole; 23, plug; 24, third bolt; 25, first oil outlet pipe; 26, second oil outlet pipe. DETAILED DESCRIPTION

[0040] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] Example 1:

[0042] like Figures 1-4 As shown, one embodiment of the present invention provides a linkage braking assembly for an electric tricycle. The electric tricycle includes a front disc brake, a rear drum brake, a first handbrake, a second handbrake, a push rod structure, and a foot pedal. The linkage braking assembly includes a linkage valve, which includes a valve body 1, a first elastic element 3, and a transmission structure.

[0043] The valve body 1 has a first receiving cavity 2 for receiving hydraulic oil, and a plunger structure is slidably connected in the first receiving cavity 2;

[0044] One end of the plunger structure is provided with a first elastic element 3, and the other end is connected to the foot pedal through a transmission structure.

[0045] A first sealing structure 4 and a second sealing structure 5 are provided between the first receiving cavity 2 and the plunger structure. Both the first sealing structure 4 and the second sealing structure 5 are used to fill the gap between the plunger structure and the side wall of the first receiving cavity 2, so as to divide the first receiving cavity 2 into a first chamber 6, a second chamber 7 and a third chamber 8.

[0046] The first chamber 6 has a first oil outlet 101 connected to the oil inlet of the front disc brake on one side, and the second chamber 7 has a second oil outlet 102 connected to the oil inlet of the rear drum brake on one side.

[0047] When the foot pedal is pressed, the foot pedal drives the plunger structure to move through the transmission structure. The hydraulic oil in the first chamber 6 is compressed and pumped from the first oil outlet 101 to the oil inlet of the front disc brake to build up pressure. The hydraulic oil in the second chamber 7 is compressed and pumped from the second oil outlet 102 to the oil inlet of the rear drum brake to build up pressure. Due to the first sealing structure 4 and the second sealing structure 5, the first chamber 6 and the second chamber 7 are not connected to each other. Even if the pressure building of one oil circuit fails, it will not affect the operation of the other oil circuit, thus improving safety.

[0048] It should be noted that there are two rear drum brakes, and the oil inlet of both rear drum brakes is connected to the second oil outlet 102.

[0049] According to one embodiment of the utility model, the plunger structure includes first plunger 9 and second plunger 10 set successively, and the transmission structure includes third plunger 11.

[0050] One end of first plunger 9 is abutted with the inner wall of first chamber 6 through first elastic piece 3, and first plunger 9 and second plunger 10 are connected through second elastic piece 12.

[0051] First sealing structure 4 is arranged on first plunger 9, and second sealing structure 5 is arranged on second plunger 10.

[0052] Third plunger 11 is connected with second plunger 10, and third plunger 11 is connected with foot pedal through the jacking rod structure.

[0053] It should be noted that the transmission structure includes third plunger 11 and the jacking rod structure, a groove is formed in third plunger 11, and the end of the jacking rod structure away from the foot pedal is movably connected in the groove, wherein the jacking rod structure is prior art, and will not be described in detail here.

[0054] Through the third plunger 11, the foot pedal is pressed, the third plunger 11 is driven by the jacking rod structure to move towards the first plunger 9, so that the second plunger 10 is driven by the third plunger 11 to move towards the first plunger 9, and because the second chamber 7 is not communicated with the first chamber 6 and the third chamber 8, the hydraulic oil in the second chamber 7 is pumped to the oil path input port of the rear drum brake actuator from the second oil outlet 102 to complete the pressure building, the second elastic piece 12 is first compressed by the movement of the second plunger 10, a force is given to the first plunger 9, the first plunger 9 is then moved, and the first elastic piece 3 is compressed, at this time, the hydraulic oil in the first chamber 6 is pumped to the oil path input port of the front disc brake actuator from the first oil outlet 101 to complete the pressure building, because of the setting of the second elastic piece 12, the first plunger 9 and the second plunger 10 move in sequence, and then the second chamber 7 is first built pressure, the first chamber 6 is built pressure later, the braking force is evenly distributed, the load ratio and the braking output are reasonable, the rear wheel of the electric tricycle brakes first, and the front wheel brakes later, so that the probability of the situation that the brake swings and the head is raised is reduced.

[0055] According to one embodiment of the utility model, one end of the third chamber 8 has a first opening, the first opening is provided with a ring groove 13, the ring groove 13 is provided with a check ring, and one end of the third plunger 11 away from the second plunger 10 is abutted with the check ring.

[0056] The check ring can make the third plunger 11 not separate from the third chamber 8, and the check ring can be quickly and conveniently disassembled and replaced with the plunger structure, the first elastic piece 3 and the third plunger 11.

[0057] According to one embodiment of the utility model, third plunger 11 is provided with third sealing structure, third sealing structure is used for filling the gap between first opening and third plunger 11,

[0058] The valve body 1 further has a second accommodating cavity 14 for accommodating hydraulic oil, and a fourth plunger 15 is slidably connected in the second accommodating cavity 14;

[0059] A fourth sealing structure 17 and a fifth sealing structure 18 are arranged between the fourth plunger 15 and the second accommodating cavity 14, and the fourth sealing structure 17 and the fifth sealing structure 18 are both used for filling the gap between the side wall of the fourth plunger 15 and the side wall of the second accommodating cavity 14, so as to divide the second accommodating cavity 14 into a fourth chamber 19, a fifth chamber 20 and a sixth chamber 21;

[0060] One end of the fourth plunger 15 abuts against the inner wall of the sixth chamber 21, and the other end of the fourth plunger 15 is provided with a third elastic element 16, the third elastic element 16 is located in the fourth chamber 19, and the fourth chamber 19 and the third chamber 8 are connected in communication through a connecting hole 22;

[0061] The fifth chamber 20 is communicated with a first oil inlet 103 for communicating with the oil outlet of the first hand brake on one side;

[0062] The sixth chamber 21 is communicated with a second oil inlet 104 for communicating with the oil outlet of the second hand brake on one side.

[0063] The first oil inlet 103 is communicated with the oil outlet of the first hand brake through a first connecting pipe, when the first hand brake is gripped, the hydraulic oil is pumped to the first oil inlet 103 through the first connecting pipe, the fourth plunger 15 is driven to move, at this time, the elastic force of the third elastic element 16 is smaller than the pressure in the fourth chamber 19, the third elastic element 16 is compressed, the hydraulic oil in the fourth chamber 19 is pumped into the third chamber 8 through the connecting hole 22, because one end of the third plunger 11 in the third chamber 8 abuts against the check ring and cannot move, therefore, after the hydraulic oil enters the third chamber 8, the second plunger 10 can be driven to move towards the first plunger 9, and then the second chamber 7 and the first chamber 6 complete the pressure building in turn. When the foot pedal and the top rod structure fail, the first hand brake can still complete the pressure building alone, so that the rear drum brake and the front disc brake can operate normally. The third plunger 11 abuts against the second plunger 10.

[0064] When the second hand brake is gripped, the hydraulic oil is pumped to the second oil inlet 104 through the second connecting pipe, the fourth plunger 15 is driven to move towards the third elastic element 16, the remaining pressure building process is consistent with the pressure building process when the first hand brake is gripped, the oil circuit conflict problem is eliminated, there is no offset, and the operation feeling is improved.

[0065] The first hand brake, the second hand brake and the foot pedal can all control two rear drum brakes and one front disc brake, and the safety is higher.

[0066] In addition, compared with the traditional brake mode of hydraulic front disc brake and mechanical rear drum brake, the rear mechanical drum brake has the problems of low efficiency of the steel cable and poor overall braking effect, while in the embodiment, the rear drum brake and the front disc brake are both hydraulic braking, which has high efficiency and better braking effect.

[0067] Further, due to the fifth sealing structure 18, the oil paths in the fifth chamber 20 and the sixth chamber 21 do not interfere with each other, so that even if one of the oil paths fails, the other oil path can still complete the normal pressure building work to drive two rear drum brakes and one front disc brake to brake, which is safer.

[0068] The fourth sealing structure 17 can prevent the hydraulic oil in the third chamber 8 from flowing into the fifth chamber 20 when the third plunger 11 moves, which is more stable.

[0069] The third sealing structure can seal the gap between the third plunger 11 and the first opening, so that the hydraulic oil in the third chamber 8 cannot leak from the first opening.

[0070] It should be noted that the linkage valve is provided with an oil return hole for preventing oil from expanding and for pressure relief, which is a prior art and will not be described in detail here.

[0071] According to an embodiment of the present application, the first plunger 9 comprises a first plunger body 901 and two first limiters 902.

[0072] The first sealing structure 4 comprises a first sealing ring 401 and a second sealing ring 402.

[0073] The two first limiters 902 are respectively used to limit the movement of the first sealing ring 401 and the second sealing ring 402 along the length direction of the first plunger body 901.

[0074] The first limiter 902 comprises a first ring plate and a second ring plate which are parallel to each other, and an annular groove is formed between the first ring plate and the second ring plate, and the first sealing ring 401 and the second sealing ring 402 are located in the annular groove formed by the corresponding first limiter 902.

[0075] The diameter of the first ring plate is smaller than that of the second ring plate, and the two first limiters 902 are symmetrically arranged, and the distance from the first ring plate in the first limiter 902 close to the first elastic member 3 to the first elastic member 3 is smaller than the distance from the second ring plate in the first limiter 902 to the first elastic member 3.

[0076] It should be noted that the first sealing ring 401 and the second sealing ring 402 are both C-shaped sealing rings, the opening directions of the first sealing ring 401 and the second sealing ring 402 are opposite, the first sealing ring 401 opens towards the first elastic member 3, and the openings of the first sealing ring 401 and the second sealing ring 402 both open towards the corresponding first ring plate, when the pedal is not stepped on or the first hand brake and the second hand brake are not gripped, the first elastic member 3 and the second elastic member 12 reset, the plunger structure resets under the driving of the first elastic member 3 and the second elastic member 12, the third plunger 11 resets, the hydraulic oil returns to reset, and preparation is made for the next braking. After the hydraulic oil in the first chamber 6 contacts the first sealing ring 401, the hydraulic oil enters the opening of the first sealing ring 401, the first sealing ring 401 can be more closely attached to the side wall of the first containing cavity 2, the sealing performance is better, and the hydraulic oil in the first chamber 6 is prevented from entering the second chamber 7, and the second sealing ring 402 can prevent the hydraulic oil in the second chamber 7 from entering the first chamber 6.

[0077] Further, the second sealing structure 5 and the first sealing structure 4 are the same in structure, therefore, the second sealing structure 5 can prevent the hydraulic oil in the third chamber 8 from entering the second chamber 7, and the hydraulic oil in the second chamber 7 from flowing into the third chamber 8.

[0078] The fifth sealing structure 18 is the same in structure and principle as the first sealing structure 4, and excessive description is not given here.

[0079] The first plunger 9 and the second plunger 10 are the same in structure, the second plunger 10 comprises a second plunger body and two second limiters, preferably, the first elastic member 3, the second elastic member 12 and the third elastic member 16 are all springs, one end of the first elastic member 3 is sleeved on the first plunger body 901 of the first plunger 9, the one end abuts against the first limiter 902 close to the first elastic member 3, and the other end abuts against the inner wall of the first chamber 6, one end of the second elastic member 12 is sleeved on the first plunger body 901 of the first plunger 9 and abuts against the first limiter 902 away from the first elastic member 3, and the other end is sleeved on the second plunger body of the second plunger 10 and abuts against one second limiter close to the first plunger 9. Such a design can make the first elastic member 3 and the second elastic member 12 stretch and retract along the length direction of the first containing cavity 2, and the stability during stretching and retracting is better.

[0080] According to an embodiment of the utility model, the linkage brake assembly comprises a first oil outlet pipe 25 and a second oil outlet pipe 26;

[0081] The first oil outlet pipe 25 is fixedly provided on the first oil outlet 101 through a first bolt, and a first through hole for connecting the first oil outlet pipe 25 and the first oil outlet 101 is formed in the first bolt;

[0082] The second oil outlet pipe 26 is fixed to the second oil outlet 102 by a second bolt, and a second through hole is formed in the second bolt to connect the second oil outlet pipe 26 and the second oil outlet 102.

[0083] It should be noted that the rear drum brake has two, therefore, the second oil outlet pipe 26 is connected with two hydraulic oil pipes on the side away from the second oil outlet 102, and the two hydraulic oil pipes are connected with the oil inlet of the two rear drum brakes respectively.

[0084] The first oil outlet 101 and the second oil outlet 102 have the same structure, the first oil outlet 101 comprises a first through hole and a first screw hole which are connected, a first bolt is screwed in the first screw hole, and the end of the first oil outlet pipe 25 is provided with a first ring hole, the first bolt is screwed with the first screw hole through the first gasket, the first ring hole and the second gasket in sequence.

[0085] In order not to affect the normal pressure building of the oil circuit, therefore, the first bolt and the second bolt are respectively provided with a first through hole and a second through hole.

[0086] According to an embodiment of the utility model, the linkage valve further comprises a plug 23, one end of the fourth chamber 19 is provided with a second opening, and the plug 23 is sealingly connected to the second opening.

[0087] The plug 23 is screwed in the second opening, and a rubber ring is arranged between the plug 23 and the side wall of the second opening to increase the sealing performance.

[0088] According to an embodiment of the utility model, the valve body 1 comprises a first machining port, the first machining port is connected with the connecting hole 22, and a third bolt 24 is screwed in the first machining port.

[0089] It should be noted that the first machining port is arranged to enable the machining of the connecting hole 22, the first machining port is sealed by screwing the third bolt 24, the third bolt 24 is an exhaust bolt, and the third bolt 24 can exhaust excess gas when hydraulic oil is injected into the first accommodating cavity 2 and the second accommodating cavity 14.

[0090] In addition, the arrangement of the first machining port enables the linkage valve to be connected with other hydraulic oil circuits and applied to a four-wheeled vehicle or a side three-wheeled vehicle which needs to be separately designed for braking force.

[0091] According to an embodiment of the utility model, an oil injection hole 105 is formed in the valve body 1 for oil injection.

[0092] The oil injection hole 105 can facilitate the injection of hydraulic oil into the first accommodating cavity 2.

[0093] Embodiment two:

[0094] An electric tricycle includes a linkage brake assembly.

[0095] In the description of the utility model, it is explained that, the position or location relation indicated by the terms "upper", "lower" and the like is based on the position or location relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0096] In the description of the utility model, it is explained that, unless otherwise explicitly specified and limited, the terms "mounting", "communication" and "connection" should be broadly understood, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly communicated, can be indirectly communicated through an intermediate medium, and can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, in the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0097] The above is only the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A linkage braking assembly for an electric tricycle, the electric tricycle comprising a front disc brake, a rear drum brake, a first handbrake, a second handbrake, a push rod structure, and a foot pedal, characterized in that, The linkage braking assembly includes a linkage valve, which includes a valve body (1), a first elastic element (3), and a transmission structure; The valve body (1) has a first receiving cavity (2) for receiving hydraulic oil, and a plunger structure is slidably connected in the first receiving cavity (2); One end of the plunger structure is provided with a first elastic element (3), and the other end is connected to the foot pedal through the transmission structure. A first sealing structure (4) and a second sealing structure (5) are provided between the first receiving cavity (2) and the plunger structure. The first sealing structure (4) and the second sealing structure (5) are both used to fill the gap between the plunger structure and the side wall of the first receiving cavity (2) to divide the first receiving cavity (2) into a first chamber (6), a second chamber (7) and a third chamber (8). The first chamber (6) has a first oil outlet (101) connected to the oil inlet of the front disc brake on one side, and the second chamber (7) has a second oil outlet (102) connected to the oil inlet of the rear drum brake on one side.

2. The linkage braking assembly according to claim 1, characterized in that, The plunger structure includes a first plunger (9) and a second plunger (10) arranged sequentially, and the transmission structure includes a third plunger (11); One end of the first plunger (9) abuts against the inner wall of the first chamber (6) through the first elastic element (3), and the first plunger (9) and the second plunger (10) are connected by the second elastic element (12); The first sealing structure (4) is disposed on the first plunger (9), and the second sealing structure (5) is disposed on the second plunger (10); The third plunger (11) is connected to the second plunger (10), and the third plunger (11) is connected to the foot pedal through the push rod structure.

3. The linkage braking assembly according to claim 2, characterized in that, The third chamber (8) has a first opening at one end, and an annular groove (13) is provided at the first opening. A retaining ring is provided in the annular groove (13), and the end of the third plunger (11) away from the second plunger (10) abuts against the retaining ring.

4. The linkage braking assembly according to claim 3, characterized in that, The third plunger (11) is provided with a third sealing structure, which is used to fill the gap between the first opening and the third plunger (11); The valve body (1) also has a second receiving cavity (14) for receiving hydraulic oil, and a fourth plunger (15) is slidably connected in the second receiving cavity (14); A fourth sealing structure (17) and a fifth sealing structure (18) are provided between the fourth plunger (15) and the second receiving cavity (14). The fourth sealing structure (17) and the fifth sealing structure (18) are both used to fill the gap between the side wall of the fourth plunger (15) and the side wall of the second receiving cavity (14) to divide the second receiving cavity (14) into a fourth chamber (19), a fifth chamber (20) and a sixth chamber (21). One end of the fourth plunger (15) abuts against the inner wall of the sixth chamber (21), and the other end is provided with a third elastic element (16). The third elastic element (16) is located in the fourth chamber (19), and the fourth chamber (19) and the third chamber (8) are connected by a connecting hole (22). The fifth chamber (20) has a first oil inlet (103) connected to one side for connecting with the oil circuit output port of the first handbrake; The sixth chamber (21) has a second oil inlet (104) connected to one side for connecting to the oil circuit output port of the second handbrake.

5. A linkage braking assembly according to claim 2, characterized in that, The first plunger (9) includes a first pillar (901) and two first limiting members (902); The first sealing structure (4) includes a first sealing ring (401) and a second sealing ring (402); The two first limiting members (902) are respectively used to restrict the movement of the first sealing ring (401) and the second sealing ring (402) along the length direction of the first column (901).

6. A linkage braking assembly according to claim 1, characterized in that, The linkage braking assembly includes a first oil outlet pipe (25) and a second oil outlet pipe (26); The first oil outlet pipe (25) is fixed to the first oil outlet (101) by a first bolt, and a first through hole is provided in the first bolt for connecting the first oil outlet pipe (25) and the first oil outlet (101). The second oil outlet pipe (26) is fixed to the second oil outlet (102) by a second bolt, and a second through hole is provided in the second bolt for connecting the second oil outlet pipe (26) and the second oil outlet (102).

7. A linkage braking assembly according to claim 4, characterized in that, The linkage valve also includes a plug (23), one end of the fourth chamber (19) has a second opening, and the plug (23) is sealed to the second opening.

8. A linkage braking assembly according to claim 4, characterized in that, The valve body (1) includes a first machining port, which is connected to the connecting hole (22), and a third bolt (24) is screwed into the first machining port.

9. A linkage braking assembly according to claim 1, characterized in that, The valve body (1) is provided with an oil injection hole (105) for oil injection.

10. An electric tricycle, characterized in that, Includes a linkage braking assembly as described in any one of claims 1-9.

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