A linkage brake assembly and electric tricycle

Abstract

The present invention relates to the technical field of electric tricycle brakes, and in particular to a linkage brake assembly and an electric tricycle. The present invention provides a linkage brake assembly, comprising a linkage valve, the linkage valve comprising a valve body, a first elastic member and a transmission structure, the valve body having a first accommodating chamber for accommodating hydraulic oil, and a plunger structure slidably connected in the first accommodating chamber. The invention drives the plunger structure to move by stepping on a foot pedal, and the foot pedal drives the plunger structure to move through the transmission structure, and the hydraulic oil in the first chamber is squeezed and pumped from the first oil outlet to the oil circuit input port of the front disc brake to complete the pressure building, and the hydraulic oil in the second chamber is squeezed and pumped from the second oil outlet to the oil circuit input port of the rear drum brake to complete the pressure building. Due to the first sealing structure and the second sealing structure, the first chamber and the second chamber are not connected to each other, even if the pressure building of one of the oil circuits fails, it will not affect the operation of the other oil circuit, and the safety is higher.

Description

Technical Field

[0001] The invention relates to the technical field of electric tricycle brakes, and in particular to a linkage brake assembly and an electric tricycle. Background Art

[0002] At present, electric tricycles are provided with foot pedals, 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 an opening at one end is provided in the valve body. The hydraulic plug is located in the cavity. The hydraulic plug seals the opening. The cavity is filled with hydraulic oil. An oil outlet communicating with the cavity is provided on the side wall of the valve body. Three oil pipes are provided on the oil outlet, which are respectively connected to two rear drum brake oil circuit input ports and one front disc brake oil circuit input port. One end of the hydraulic plug is transmission-connected to the foot pedal through a push rod structure, and the other end of the hydraulic plug is connected to the elastic member. When braking is needed, the user steps on the foot pedal, and the hydraulic plug is driven to move through the push rod structure, the elastic member is compressed, and the hydraulic oil in the cavity is pumped into the three oil pipes, so that the rear drum brake and the front disc brake are braked at the same time.

[0003] However, since the above methods all output oil through the same cavity, when one of the oil circuits fails to build pressure, it affects the pressure in the cavity, which in turn may easily cause the pressure building of other oil circuits to fail, causing the front disc brake to fail or the rear drum brake to fail, thus posing certain safety hazards. Summary of the invention

[0004] (I) The problem to be solved by the present invention is: how to ensure that when one oil circuit fails, the other oil circuits will not be affected, thereby improving safety.

[0005] (II) Technical solution

[0006] The present invention provides a linkage brake assembly for an electric tricycle, wherein the electric tricycle comprises a front disc brake, a rear drum brake, a first hand brake, a second hand brake, a push rod structure and a foot pedal, wherein the linkage brake assembly comprises a linkage valve, wherein the linkage valve comprises a valve body, a first elastic member and a transmission structure;

[0007] The valve body has a first accommodating chamber for accommodating hydraulic oil, and a plunger structure is slidably connected in the first accommodating chamber;

[0008] A first elastic member is provided at one end of the plunger structure, and the other end thereof is transmission-connected to the pedal via the transmission structure;

[0009] A first sealing structure and a second sealing structure are provided between the first accommodating cavity and the plunger structure, and the first sealing structure and the second sealing structure are both used to fill the gap between the plunger structure and the side wall of the first accommodating cavity, so as to separate the first accommodating cavity into a first chamber, a second chamber and a third chamber;

[0010] One side of the first chamber is connected to a first oil outlet for connecting to the oil circuit input port of the front disc brake, and one side of the second chamber is connected to a second oil outlet for connecting to the oil circuit input port of the rear drum brake.

[0011] According to one embodiment of the present invention, the plunger structure includes a first plunger and a second plunger arranged in sequence, and the transmission structure includes a third plunger;

[0012] One end of the first plunger abuts against the inner wall of the first chamber through a first elastic member, and the first plunger and the second plunger are connected through a second elastic member;

[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 to the second plunger, and the third plunger is transmission-connected to the foot pedal via the push rod structure.

[0015] According to an embodiment of the present invention, one end of the third chamber has a first opening, an annular groove is provided at the first opening, a retaining ring is provided in the annular groove, and an end of the third plunger away from the second plunger abuts against the retaining ring.

[0016] According to one embodiment of the present invention, a third sealing structure is provided on the third plunger, and the third sealing structure is used to fill the gap between the first opening and the third plunger;

[0017] The valve body also has a second accommodating chamber for accommodating hydraulic oil, and a fourth plunger is slidably connected in the second accommodating chamber;

[0018] A fourth sealing structure and a fifth sealing structure are provided between the fourth plunger and the second accommodating chamber, and the fourth sealing structure and the fifth sealing structure are both used to fill the gap between the side wall of the fourth plunger and the side wall of the second accommodating chamber, so as to separate the second accommodating chamber into a fourth chamber, a fifth chamber and a sixth chamber;

[0019] One end of the fourth plunger abuts against the inner wall of the sixth chamber, and the other end of the fourth plunger is provided with a third elastic member, the third elastic member is located in the fourth chamber, and the fourth chamber and the third chamber are connected through a connecting hole;

[0020] One side of the fifth chamber is connected to a first oil inlet for communicating with the oil circuit output port of the first hand brake;

[0021] One side of the sixth chamber is connected to a second oil inlet for connecting with the oil circuit output port of the second hand brake.

[0022] According to one embodiment of the present invention, the first plunger includes a first cylinder and two first stoppers;

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

[0024] The two first limiting members are used to limit the movement of the first sealing ring and the second sealing ring along the length direction of the first column respectively.

[0025] According to one embodiment of the present invention, the linkage brake assembly includes a first oil outlet pipe and a second oil outlet pipe;

[0026] The first oil outlet pipe is fixed to the first oil outlet by a first bolt, and a first through hole for connecting the first oil outlet pipe and the first oil outlet is formed in the first bolt;

[0027] The second oil outlet pipe is fixed to the second oil outlet port by a second bolt, and a second through hole for connecting the second oil outlet pipe and the second oil outlet port is formed in the second bolt.

[0028] According to one embodiment of the present invention, the linkage valve further includes a plug, one end of the fourth chamber has a second opening, and the plug is sealingly connected to the second opening.

[0029] According to an embodiment of the present invention, the valve body comprises a first processed opening, the first processed opening is communicated with the connecting hole, and a third bolt is threadedly connected in the first processed opening.

[0030] According to an embodiment of the present invention, an oil filling hole for oil filling is provided on the valve body.

[0031] An electric tricycle comprises any one of the linkage brake components described above.

[0032] Beneficial effects of the present invention:

[0033] When the foot pedal is stepped on, the foot pedal drives the plunger structure to move through the transmission structure, and the hydraulic oil in the first chamber is squeezed and pumped from the first oil outlet to the oil circuit input port of the front disc brake to build up pressure. The hydraulic oil in the second chamber is squeezed and pumped from the second oil outlet to the oil circuit input port of the rear drum brake to build up pressure. Due to the first sealing structure and the second sealing structure, the first chamber and the second chamber are not connected to each other. Even if the pressure building of one of the oil circuits fails, it will not affect the operation of the other oil circuits, and the safety is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A three-dimensional diagram of a linkage brake assembly provided in an embodiment of the present invention;

[0036] Figure 2 A cross-sectional view of a linkage brake assembly provided by an embodiment of the present invention;

[0037] Figure 3 A cross-sectional view of a valve body provided by an embodiment of the present invention;

[0038] Figure 4 A stereoscopic diagram of a plunger structure, a first sealing structure, a second sealing structure and a third plunger provided in an embodiment of the present invention.

[0039] Icons: 1. Valve body; 101. First oil outlet; 102. Second oil outlet; 103. First oil inlet; 104. Second oil inlet; 105. Oil filling hole; 2. First accommodating chamber; 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 column; 9 02. First limit member; 10. Second plunger; 11. Third plunger; 12. Second elastic member; 13. Ring groove; 14. Second accommodating chamber; 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 the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Embodiment 1:

[0042] like Figure 1-Figure 4As shown, one embodiment of the present invention provides a linkage brake assembly for an electric tricycle, the electric tricycle comprising a front disc brake, a rear drum brake, a first hand brake, a second hand brake, a push rod structure and a foot pedal, the linkage brake assembly comprising a linkage valve, the linkage valve comprising a valve body 1, a first elastic member 3 and a transmission structure;

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

[0044] A first elastic member 3 is provided at one end of the plunger structure, and the other end thereof is transmission-connected to the pedal via a transmission structure;

[0045] A first sealing structure 4 and a second sealing structure 5 are provided between the first accommodating cavity 2 and the plunger structure, and 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 accommodating cavity 2, so as to separate the first accommodating cavity 2 into a first chamber 6, a second chamber 7 and a third chamber 8;

[0046] One side of the first chamber 6 is connected to a first oil outlet 101 for connecting to the oil circuit input port of the front disc brake, and one side of the second chamber 7 is connected to a second oil outlet 102 for connecting to the oil circuit input port of the rear drum brake.

[0047] When the foot pedal is stepped on, the foot pedal drives the plunger structure to move through the transmission structure, and the hydraulic oil in the first chamber 6 is squeezed and pumped from the first oil outlet 101 to the oil circuit input port of the front disc brake to complete the pressure building. The hydraulic oil in the second chamber 7 is squeezed and pumped from the second oil outlet 102 to the oil circuit input port of the rear drum brake to complete the pressure building. 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 of the oil circuits fails, it will not affect the operation of the other oil circuits, and the safety is higher.

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

[0049] According to one embodiment of the present invention, the plunger structure includes a first plunger 9 and a second plunger 10 arranged in sequence, and the transmission structure includes a third plunger 11;

[0050] One end of the first plunger 9 abuts against the inner wall of the first chamber 6 via the first elastic member 3, and the first plunger 9 and the second plunger 10 are connected via the second elastic member 12;

[0051] The first sealing structure 4 is arranged on the first plunger 9, and the second sealing structure 5 is arranged on the second plunger 10;

[0052] The third plunger 11 is connected to the second plunger 10, and the third plunger 11 is transmission-connected to the pedal via a push rod structure.

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

[0054] By pressing the foot pedal through the third plunger 11, the third plunger 11 is driven to move toward the first plunger 9 through the push rod structure, so that the second plunger 10 moves toward the first plunger 9 driven by the third plunger 11. Since the second chamber 7 is not connected with the first chamber 6 and the third chamber 8, the hydraulic oil in the second chamber 7 is pumped from the second oil outlet 102 to the oil circuit input port of the rear drum brake to complete the pressure building. The movement of the second plunger 10 causes the second elastic member 12 to be compressed first, giving a force to the first plunger 9. The first plunger 9 then moves and the first elastic member 3 is compressed. At this time, the hydraulic oil in the first chamber 6 is under pressure and pumped from the first oil outlet 101 to the oil circuit input port of the front disc brake to complete the pressure building. Due to the arrangement of the second elastic member 12, the first plunger 9 and the second plunger 10 move in a sequence, and then the second chamber 7 builds pressure first, and the first chamber 6 builds pressure later. The braking force is evenly distributed, the load ratio and the braking output are reasonable, the rear wheels of the electric tricycle are braked first, and the front wheels are braked later, thereby reducing the probability of braking skidding and tilting the head.

[0055] According to an embodiment of the present invention, one end of the third chamber 8 has a first opening, an annular groove 13 is provided at the first opening, a retaining ring is provided in the annular groove 13, and one end of the third plunger 11 away from the second plunger 10 abuts against the retaining ring.

[0056] The retaining ring can prevent the third plunger 11 from being separated from the third chamber 8 , and the retaining ring can be quickly and conveniently used to disassemble and replace the plunger structure, the first elastic member 3 and the third plunger 11 .

[0057] According to one embodiment of the present invention, a third sealing structure is provided on the third plunger 11, and the third sealing structure is used to fill the gap between the first opening and the third plunger 11;

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

[0059] A fourth sealing structure 17 and a fifth sealing structure 18 are provided between the fourth plunger 15 and the second accommodating chamber 14. The fourth sealing structure 17 and the fifth sealing structure 18 are used to fill the gap between the side wall of the fourth plunger 15 and the side wall of the second accommodating chamber 14, so as to separate the second accommodating chamber 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 thereof is provided with a third elastic member 16, the third elastic member 16 is located in the fourth chamber 19, and the fourth chamber 19 and the third chamber 8 are connected through a connecting hole 22;

[0061] One side of the fifth chamber 20 is connected to a first oil inlet 103 for communicating with an oil outlet of the first hand brake;

[0062] One side of the sixth chamber 21 is connected to a second oil inlet 104 for communicating with an oil outlet of a second hand brake.

[0063] Among them, the first oil inlet 103 is connected to the oil circuit output port of the first hand brake through the first connecting pipe. When the first hand brake is grasped, the hydraulic oil is pumped to the first oil inlet 103 through the first connecting pipe, pushing the fourth plunger 15 to move. At this time, the elastic force of the third elastic member 16 is less than the pressure in the fourth chamber 19, the third elastic member 16 is compressed, and the hydraulic oil in the fourth chamber 19 is pumped into the third chamber 8 through the connecting hole 22. Since one end of the third plunger 11 in the third chamber 8 abuts against the retaining ring and cannot move, after the hydraulic oil enters the third chamber 8, it can push the second plunger 10 to move toward the direction of the first plunger 9, thereby allowing the second chamber 7 and the first chamber 6 to complete the pressure build-up in sequence. When the pedal and the push rod structure fail, the first hand brake can still complete the pressure build-up alone, so that the rear drum brake and the front disc brake can operate normally. Among them, the third plunger 11 abuts against the second plunger 10.

[0064] When the second hand brake is grasped, the hydraulic oil is pumped to the second oil inlet 104 through the second connecting pipe, pushing the fourth plunger 15 to move toward the third elastic member 16. The remaining pressure building process is consistent with the pressure building process of grasping the first hand brake, eliminating the oil circuit conflict problem, without hedging, and improving the operating feel.

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

[0066] In addition, compared with the traditional braking method of front hydraulic disc brake and rear mechanical drum brake, the rear mechanical drum brake has the problem of low steel cable efficiency and poor overall braking effect. In this embodiment, both the rear drum brake and the front disc brake are hydraulically braked, which has high efficiency and better braking effect.

[0067] Furthermore, due to the provision of the fifth sealing structure 18, the oil circuits in the fifth chamber 20 and the sixth chamber 21 do not interfere with each other. Even if one of the oil circuits fails, the other oil circuit can still complete the normal pressure building work, driving the two rear drum brakes and one front disc brake to brake, which is safer.

[0068] By setting the fourth sealing structure 17, when the third plunger 11 moves, the hydraulic oil in the third chamber 8 will not flow into the fifth chamber 20, and the stability is better.

[0069] By providing the third sealing structure, the third sealing structure can seal the gap between the third plunger 11 and the first opening, thereby preventing the hydraulic oil in the third chamber 8 from leaking from the first opening.

[0070] It should be noted that an oil return hole is provided on the linkage valve to prevent the oil from expanding and is used for pressure relief. The oil return hole is a prior art and will not be described in detail here.

[0071] According to one embodiment of the present invention, the first plunger 9 includes a first cylinder 901 and two first stoppers 902;

[0072] The first sealing structure 4 includes a first sealing ring 401 and a second sealing ring 402;

[0073] The two first limiting members 902 are used to limit the movement of the first sealing ring 401 and the second sealing ring 402 along the length direction of the first column 901 , respectively.

[0074] The first stopper 902 includes a first ring plate and a second ring plate which are parallel to each other. An annular groove is formed between the first ring plate and the second ring plate. The first sealing ring 401 and the second sealing ring 402 are located in the annular grooves formed by the corresponding first stopper 902 .

[0075] The diameter of the first ring plate is smaller than that of the second ring plate, the two first limiting members 902 are symmetrically arranged, and the distance from the first ring plate in the first limiting member 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 limiting member 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, and the opening directions of the first sealing ring 401 and the second sealing ring 402 are opposite. The opening of the first sealing ring 401 faces the first elastic member 3, and the openings of the first sealing ring 401 and the second sealing ring 402 face the first ring plates corresponding to each other. When the pedal is not stepped on or the first hand brake and the second hand brake are not grasped, the first elastic member 3 and the second elastic member 12 are reset, and the plunger structure is reset under the drive of the first elastic member 3 and the second elastic member 12, and the third plunger 11 is reset, and the hydraulic oil refluxes and resets, preparing for the next braking. After the hydraulic oil in the first chamber 6 contacts the first sealing ring 401, even if it enters the opening of the first sealing ring 401, the first sealing ring 401 can make the side wall of the first accommodating chamber 2 more closely fitted and more tightly sealed, thereby preventing the hydraulic oil in the first chamber 6 from entering the second chamber 7. Similarly, the setting of the second sealing ring 402 can prevent the hydraulic oil in the second chamber 7 from entering the first chamber 6.

[0077] Furthermore, the second sealing structure 5 has the same structure as the first sealing structure 4 , and 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 structure and principle of the fifth sealing structure 18 are the same as those of the first sealing structure 4, and will not be described in detail.

[0079] The first plunger 9 and the second plunger 10 have the same structure. The second plunger 10 includes a second column and two second stoppers. 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 column 901 of the first plunger 9, one end of which abuts against the first stopper 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 column 901 of the first plunger 9 and abuts against the first stopper 902 away from the first elastic member 3, and the other end of the second elastic member 12 is sleeved on the second column of the second plunger 10 and abuts against a second stopper close to the first plunger 9. Such a design enables the first elastic member 3 and the second elastic member 12 to be able to extend and retract along the length direction of the first accommodating chamber 2 when extending and retracting, and the stability during extension and retraction is better.

[0080] According to one embodiment of the present invention, the linkage brake assembly includes a first oil outlet pipe 25 and a second oil outlet pipe 26;

[0081] The first oil outlet pipe 25 is fixed to the first oil outlet 101 by 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 for connecting the second oil outlet pipe 26 and the second oil outlet 102 is defined in the second bolt.

[0083] It should be noted that there are two rear drum brakes, and therefore, the side of the second oil outlet pipe 26 away from the second oil outlet port 102 is connected to two hydraulic oil pipes, which are respectively connected to the oil circuit input ports of the two rear drum brakes.

[0084] The first oil outlet 101 and the second oil outlet 102 have the same structure. The first oil outlet 101 includes a first flow hole and a first screw hole that are connected to each other. The first bolt is screwed in the first screw hole. A first annular hole is opened at the end of the first oil outlet pipe 25. The first bolt passes through the first gasket, the first annular hole, and the second gasket in sequence and is screwed to the first screw hole.

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

[0086] According to one embodiment of the present invention, the linkage valve further includes a plug 23, one end of the fourth chamber 19 has a second opening, and the plug 23 is sealed and connected to the second opening.

[0087] The plug 23 is provided to quickly and conveniently disassemble the fourth plunger 15 and the third elastic member 16. The plug 23 is screwed at the second opening, and a rubber ring is provided between the plug 23 and the side wall of the second opening to increase the sealing performance.

[0088] According to an embodiment of the present invention, the valve body 1 comprises a first processed opening, the first processed opening is communicated with the connecting hole 22, and a third bolt 24 is threadedly connected in the first processed opening.

[0089] It should be noted here that the first processing port is set to be able to process the connecting hole 22. The first processing port is sealed by screwing the third bolt 24. The third bolt 24 is an exhaust bolt that can discharge excess gas when hydraulic oil is injected into the first accommodating chamber 2 and the second accommodating chamber 14.

[0090] In addition, the setting of the first processing port enables the linkage valve to be connected to other hydraulic oil circuits for application on four-wheel vehicles or sidecars that require individually designed braking force.

[0091] According to one embodiment of the present invention, an oil filling hole 105 for filling oil is provided on the valve body 1 .

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

[0093] Embodiment 2:

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

[0095] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0096] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A linkage brake assembly for an electric tricycle, the electric tricycle comprising a front disc brake, a rear drum brake, a first hand brake, a second hand brake, a push rod structure and a foot pedal, characterized in that: The linkage brake assembly comprises a linkage valve, and the linkage valve comprises a valve body (1), a first elastic member (3) and a transmission structure; The valve body (1) has a first accommodating chamber (2) for accommodating hydraulic oil, and a plunger structure is slidably connected in the first accommodating chamber (2); A first elastic member (3) is provided at one end of the plunger structure, and the other end thereof is transmission-connected to the pedal via the transmission structure; A first sealing structure (4) and a second sealing structure (5) are provided between the first accommodating cavity (2) and the plunger structure, and 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 accommodating cavity (2), so as to separate the first accommodating cavity (2) into a first chamber (6), a second chamber (7) and a third chamber (8); One side of the first chamber (6) is connected to a first oil outlet (101) for connecting to the oil circuit input port of the front disc brake, and one side of the second chamber (7) is connected to a second oil outlet (102) for connecting to the oil circuit input port of the rear drum brake.

2. A linkage brake assembly according to claim 1, characterized in that: The plunger structure comprises a first plunger (9) and a second plunger (10) which are arranged in sequence, and the transmission structure comprises a third plunger (11); One end of the first plunger (9) abuts against the inner wall of the first chamber (6) via a first elastic member (3), and the first plunger (9) and the second plunger (10) are connected via a second elastic member (12); The first sealing structure (4) is arranged on the first plunger (9), and the second sealing structure (5) is arranged on the second plunger (10); The third plunger (11) is connected to the second plunger (10), and the third plunger (11) is transmission-connected to the foot pedal via the push rod structure.

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

4. A linkage brake assembly according to claim 3, characterized in that: The third plunger (11) is provided with a third sealing structure, and the third sealing structure is used to fill the gap between the first opening and the third plunger (11); The valve body (1) further comprises a second accommodating chamber (14) for accommodating hydraulic oil, and a fourth plunger (15) is slidably connected in the second accommodating chamber (14); A fourth sealing structure (17) and a fifth sealing structure (18) are provided between the fourth plunger (15) and the second accommodating chamber (14), and the fourth sealing structure (17) and the fifth sealing structure (18) are used to fill the gap between the side wall of the fourth plunger (15) and the side wall of the second accommodating chamber (14), so as to separate the second accommodating chamber (14) into a fourth chamber (19), a fifth chamber (20) and a sixth chamber (21); One end of the fourth plunger (15) is in contact with the inner wall of the sixth chamber (21), and the other end thereof is provided with a third elastic member (16), the third elastic member (16) is located in the fourth chamber (19), and the fourth chamber (19) and the third chamber (8) are connected via a connecting hole (22); One side of the fifth chamber (20) is connected to a first oil inlet (103) for communicating with an oil outlet of the first hand brake; One side of the sixth chamber (21) is connected to a second oil inlet (104) for communicating with the oil outlet of the second hand brake.

5. A linkage brake assembly according to claim 2, characterized in that: The first plunger (9) comprises a first column (901) and two first stoppers (902); The first sealing structure (4) comprises a first sealing ring (401) and a second sealing ring (402); The two first limiting members (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 column (901).

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

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

8. A linkage brake assembly according to claim 4, characterized in that: The valve body (1) comprises a first processed opening, the first processed opening is connected to the connecting hole (22), and a third bolt (24) is threadedly connected in the first processed opening.

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

10. An electric tricycle, characterized in that: A linkage brake assembly comprising any one of claims 1-9.

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