Brake transmission system of tricycle

Abstract

The invention discloses a tricycle brake transmission system, which relates to the technical field of tricycle brakes and comprises a rack, a bearing is fixedly mounted on the rack, a brake transmission shaft is fixedly mounted on an inner ring of the bearing, and an L-shaped driving arm and an L-shaped driven arm are mounted on the brake transmission shaft. The two driven arms are installed at the two ends of the brake transmission shaft correspondingly. The winding block is mounted on the brake transmission shaft in a sliding manner and is used for winding and connecting a brake cable; the protruding block is fixedly installed on the winding block and used for being connected with the brake cable in a matched mode. The inner moving block is elastically pulled to move through the connecting spring, and the winding block is driven to move through the pull rod along with movement of the inner moving block, so that the winding block synchronously pulls the rear wheel brake cable to move, and the rear wheel brake cable is prevented from being damaged during braking. And meanwhile, the rear wheel brake cables can be elastically pulled to move through the connecting springs, so that the brake conditions of the rear wheel brake cables on the two sides are adjusted in a self-adaptive mode.

Description

Technical Field

[0001] The invention relates to the technical field of tricycle brakes, and in particular to a tricycle brake transmission system. Background Art

[0002] A tricycle is a combination of a rickshaw and a bicycle, and can be divided into human-powered tricycles, electric tricycles, children's tricycles, and battery tricycles. A tricycle consists of two parts, the front part has a steerable wheel, handlebars, bells, brakes, pedals, and a seat, and the rear wheel is driven by a chain;

[0003] When a tricycle is in use, due to the wear of brake pads, looseness of brake lines and brake rods or other reasons, it is easy for when the brake pedal is stepped on, although the brake drive shaft rotates, when it brakes by pulling the brake mechanism on the rear wheel through the slave arm, it will cause the problem of biased braking, that is, when one rear wheel is braked, the other rear wheel has not been braked yet. At this time, the tricycle is prone to rollover and side bending, which may cause road accidents and endanger the driver. Summary of the invention

[0004] The object of the present invention is to provide a tricycle brake transmission system to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a tricycle brake transmission system, comprising a frame, a bearing is fixedly mounted on the frame, a brake transmission shaft is fixedly mounted on the inner ring of the bearing, an L-shaped active arm and a driven arm are mounted on the brake transmission shaft, and the two driven arms are respectively mounted at both ends of the brake transmission shaft; it also includes: a winding block, which is slidably mounted on the brake transmission shaft for winding and connecting the brake line; a protrusion, which is fixedly mounted on the winding block to cooperate with the connection of the brake line; a connecting rod, which is fixedly mounted on the protrusion and extends into the interior of the brake transmission shaft; an inner moving block and a connecting block, a connecting spring is fixedly mounted between the inner moving block and the connecting block, and the inner moving block and the connecting block are both slidably mounted in the brake transmission shaft, and the connecting rod is connected to the inner moving block through a locking mechanism; an inclined groove, which is opened on the active arm, and a roller is slidably mounted in the inclined groove; a slide plate, which is slidably mounted on the active arm and is located below the inclined groove, and an inward retraction mechanism is provided between the slide plate and the connecting block;

[0006] During the active braking process, as the pull rope pulls the roller to move, the roller will drive the driven arm to rotate through the active arm to brake the two rear wheels. At the same time, when the roller moves in the inclined groove, the brake lines on the two driven arms will be tightened again to coordinate braking, thereby avoiding biased braking.

[0007] Preferably, the adduction mechanism includes a bottom frame fixedly installed on the sliding plate. A connecting sleeve is fixedly installed on the bottom frame. A connecting bar is slidably installed on the brake transmission shaft along its radial direction. The connecting bar is inserted into the connecting sleeve so that the two are connected.

[0008] A top plate is fixedly installed on the connecting bar.

[0009] Pulling blocks are fixedly installed at one end of each of the two connecting blocks close to each other. The two ends of the top plate are respectively inserted into the two pulling blocks, and the pulling blocks are provided with bevel edges.

[0010] Preferably, the top plate is in a "concave" shape, and a first spring is fixedly installed between the upper surface of the top plate and the inner wall of the brake transmission shaft.

[0011] Preferably, the locking mechanism includes a block slidably installed on the connecting rod. The block is in an L shape, and a chamfer is provided at one end of the block away from the connecting rod.

[0012] The short arm end of the block extends out from the bottom end of the connecting rod and is inserted into the inner moving block. A plurality of card slots are opened on the inner moving block.

[0013] A second spring is fixedly installed between the bottom end of the block and the connecting rod.

[0014] Preferably, the winding block is in an "H" shape, and the convex block is in a "concave" shape.

[0015] A perforation is opened on the brake transmission shaft, and a locking screw is threadedly inserted into the convex block.

[0016] Preferably, a plug is slidably inserted into the connecting sleeve, and a slot adapted to the plug is opened on the connecting bar.

[0017] Preferably, both the active arm and the driven arm are hollow, and the inclined slot on the active arm is inclined at 45°.

[0018] Preferably, baffles are fixedly installed on the rear sides of both the active arm and the driven arm.

[0019] Preferably, mounting plates are fixedly installed on both the active arm, the driven arm and the bearing, and a threaded groove is opened on the brake transmission shaft.

[0020] In the above technical solution, the present invention provides a tricycle brake transmission system, which has the following beneficial effects: When braking, when the brake pedal is depressed, the pull rope drives the brake drive shaft to rotate through the active arm. While the brake drive shaft drives the two rear wheel brake wires to move through the driven arm for braking, the roller will pull the connecting sleeve and the connecting bar to move through the sliding plate, so that the top plate presses the pulling block, thereby causing the pulling block to drive the connecting block to move. At this time, the elastic pulling inner moving block is moved through the connecting spring. As the inner moving block moves, it will drive the winding block to move through the pull rod, so that the winding block also synchronously pulls the rear wheel brake wire to move. Therefore, when braking, the connecting spring can be used to elastically pull the rear wheel brake wire to move, so as to adaptively adjust the braking conditions of the rear wheel brake wires on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the three-dimensional structure provided by the embodiment of the present invention;

[0023] Figures 2 - 3 All are provided by the embodiment of the present invention Figure 1 Partial structure schematic diagram;

[0024] Figure 4 Partial structure schematic diagram of the inner moving block provided by the embodiment of the present invention;

[0025] Figure 5 Partial structure schematic diagram of the active arm provided by the embodiment of the present invention;

[0026] Figure 6 Partial structure schematic diagram of the winding block provided by the embodiment of the present invention;

[0027] Figure 7 Provided by the embodiment of the present invention Figure 4 Schematic diagram of the structure at position A;

[0028] Figure 8 Partial structure schematic diagram of the winding block provided by the embodiment of the present invention.

[0029] Description of the reference numerals:

[0030] 1. Frame; 2. Bearing; 3. Brake drive shaft; 31. Perforation; 4. Active arm; 41. Baffle; 5. Driven arm; 61. Winding block; 62. Bump; 63. Connecting rod; 64. Locking screw; 65. Block; 66. Inner moving block; 67. Connecting block; 68. Connecting spring; 69. Pulling block; 71. Top plate; 72. Connecting strip; 73. Connecting sleeve; 74. Insert block; 75. Bottom frame; 76. Slide plate; 77. Roller; 78. Pulling rope; 8. Mounting plate. Detailed implementation mode

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Please refer to Figures 1 - 8 , a tricycle brake drive system, including a frame 1, a bearing 2 is fixedly installed on the frame 1, an inner ring of the bearing 2 is fixedly installed with a brake drive shaft 3, an L-shaped active arm 4 and a driven arm 5 are installed on the brake drive shaft 3, and the two driven arms 5 are respectively installed at both ends of the brake drive shaft 3;

[0033] It also includes:

[0034] A winding block 61, which is slidably installed on the brake drive shaft 3 for winding and connecting the brake wire;

[0035] A bump 62, which is fixedly installed on the winding block 61 to cooperate with the connection of the brake wire;

[0036] A connecting rod 63, which is fixedly installed on the bump 62 and extends into the inside of the brake drive shaft 3;

[0037] An inner moving block 66 and a connecting block 67, a connecting spring 68 is fixedly installed between the inner moving block 66 and the connecting block 67, and both the inner moving block 66 and the connecting block 67 are slidably installed in the brake drive shaft 3, and the connecting rod 63 is connected to the inner moving block 66 through a locking mechanism;

[0038] An inclined groove, which is opened on the active arm 4, and a roller 77 is slidably installed in the inclined groove;

[0039] A slide plate 76, which is slidably installed on the active arm 4 and is located below the inclined groove, and an inward retracting mechanism is provided between the slide plate 76 and the connecting block 67;

[0040] During the active braking process, when the pulling rope 78 pulls the roller 77 to move, the roller 77 will drive the driven arm 5 to rotate through the active arm 4 to brake the two rear wheels. At the same time, when the roller 77 moves in the inclined groove, the brake wires on the two driven arms 5 will be tightened again to coordinate the braking, so as to avoid uneven braking.

[0041] In another embodiment of the present invention: The adduction mechanism includes a bottom frame 75 fixedly installed on the sliding plate 76. A connecting sleeve 73 is fixedly installed on the bottom frame 75. A connecting bar 72 is slidably installed along the radial direction of the brake transmission shaft 3. The connecting bar 72 is inserted into the connecting sleeve 73 so that the two are connected;

[0042] A top plate 71 is fixedly installed on the connecting bar 72;

[0043] Pulling blocks 69 are fixedly installed at one end of the two connecting blocks 67 close to each other. The two ends of the top plate 71 are respectively inserted into the two pulling blocks 69, and the pulling blocks 69 are provided with bevel edges;

[0044] When the skateboard 76 moves downward, as it moves downward, it will drive the connecting bar 72 to move through the connecting sleeve 73. At this time, the connecting bar 72 will drive the top plate 71 to move. At this time, both ends of the top plate 71 will move along the hypotenuse of the pulling block 69. At this time, the top plate 71 will drive the two pulling blocks 69 to move towards each other. When the pulling block 69 moves, it will drive the connecting block 67 to move. At this time, the connecting block 67 will pull the inner moving block 66 to move through the connecting spring 68. The inner moving block 66 will drive the connecting rod 63 to move. At this time, the connecting rod 63 will pull the winding block 61 and the convex block 62 to move. At this time, the winding block 61 will axially slide in the brake transmission shaft 3. At this time, the winding block 61 will pull the brake wire to move. At this time, the brake wire moves not only by the rotation of the brake transmission shaft 3 but also under the pull of the winding block 61. Since the connecting block 67 drives the inner moving block 66 to slide through the connecting spring 68, at this time, the inner moving block 66 and the connecting block 67 are elastically connected. In this way, when one side of the two rear wheels has a brake response, the other side adjusts the rear wheel brake wire for braking by itself. That is, when the brake transmission shaft 3 pulls the rear wheel brake wire through the two driven arms 5 at the same time, when the rear wheel brake wire on one side is pulled to the braking mechanism on the rear wheel and the brake pads on it contact the wheel to generate braking, at this time, the rear wheel brake wire on this side will have a reverse acting force. And when the connecting block 67 on this side pulls the inner moving block 66 through the connecting spring 68, the inner moving block 66 and the connecting rod 63 will have a certain reverse resistance. At this time, the displacement trend of the inner moving block 66 will be lower. At this time, the connecting spring 68 on this side will be stretched first. And when the rear wheel brake wire on the other side moves synchronously through the rotation of the brake transmission shaft 3 and the brake pads on the rear wheel braking mechanism it is connected to contact the wheel, at this time, the resistance generated by the rear wheel brake wire on the other side is smaller. Therefore, when the connecting block 67 on the other side pulls the inner moving block 66 through the connecting spring 68, the inner moving block 66 will be more likely to move. Thus, the inner moving block 66 on the other side pulls the connecting rod 63 on it to move. In this way, the winding block 61 on the other side drives the rear wheel brake wire to move. Thus, the rear wheel brake wire on the other side further pulls the braking mechanism on the rear wheel to start, so as to ensure that the brake pads on the other side contact the wheel for braking, so as to ensure that the two rear wheels brake as synchronously as possible. The braking mechanism on the rear wheel can be a drum brake, which is a mature existing technology and will not be specifically described here.

[0045] In another embodiment of the present invention: The top plate 71 is in a "concave" shape, and a first spring is fixedly installed between the upper surface of the top plate 71 and the inner wall of the brake transmission shaft 3;

[0046] The "concave" - shaped top plate 71 is inverted. Thus, when the connecting bar 72 pulls the top plate 71 to move, the two protruding parts of the "concave" - shaped top plate 71 abut against the hypotenuse of the pulling block 69 to drive the pulling block 69 to move. When the sliding plate 76 resets, the first spring raises the pulling top plate 71, so that it no longer abuts against the pulling block 69.

[0047] In another embodiment of the present invention: The locking mechanism includes a clamping block 65 slidably mounted on the connecting rod 63. The clamping block 65 is L - shaped, and a chamfer is provided at the end of the clamping block 65 away from the connecting rod 63.

[0048] The short - arm end of the clamping block 65 extends from the bottom end of the connecting rod 63 and is inserted into the inner moving block 66. A number of card slots are provided on the inner moving block 66.

[0049] A second spring is fixedly installed between the bottom end of the clamping block 65 and the connecting rod 63.

[0050] Among them, the card slot is right - angled triangular. After the tip of the clamping block 65 is inserted into the card slot, it will limit the outward movement of the connecting rod 63. And the second spring will always pull the clamping block 65 and the connecting rod 63 to fit tightly, so as to ensure that the clamping block 65 is always inserted into the card slot.

[0051] The connecting rod 63 can be directly slid, so that the connecting rod 63 moves inward on the brake transmission shaft 3. At this time, the hypotenuse of the clamping block 65 abuts against the hypotenuse of the card slot, and the clamping block 65 will rise, thus not affecting the movement of the connecting rod 63. As the connecting rod 63 moves, it will pull the winding block 61 to move. At this time, the winding block 61 will drive the rear - wheel brake wire to move, so as to adjust the length of the rear - wheel brake wire to adjust the braking force after the brake pads are worn. And the adjustment is simple, which is suitable for most users of tricycles.

[0052] A limiting block is fixedly installed on the inner wall of the brake transmission shaft 3. It is arranged at one end of the inner moving block 66 away from the connecting block 67 to fix the position of the inner moving block 66 so that it will not move randomly. A magnet is installed on the inner wall of the limiting block, and an iron sheet is installed in the inner moving block 66, so as to adsorb the inner moving block 66, but the suction force is weak, only used for positioning and preventing the inner moving block 66 from moving when the tricycle shakes.

[0053] In another embodiment of the present invention: The winding block 61 is "H" - shaped, and the convex block 62 is "concave" - shaped.

[0054] A perforation 31 is provided on the brake transmission shaft 3, and a locking screw 64 is threadedly inserted into the convex block 62.

[0055] Among them, the groove end of the convex block 62 is fixed on the winding block 61, and the outer end of the winding block 61 is arc - shaped, and the outer dimension of the winding block 61 is adapted to the inner - wall dimension of the brake transmission shaft 3.

[0056] Wherein, the perforation 31 is arranged below the brake drive shaft 3. After the brake wire is inserted into the perforation 31 through the driven shaft, refer to Figure 8 , at this time, the brake wire is wound around the winding block 61 and then enters the inner groove of the convex block 62. At this time, the locking screw 64 on the convex block 62 is tightened. At this time, the locking screw 64 will tightly connect and lock the brake wire. When the brake wire passes through the winding block 61, it will generate a large frictional resistance when contacting the perforation 31 and the winding block 61, thereby reducing the possibility of the brake wire falling off the winding block 61 and also making the brake wire more tightly installed on the winding block 61.

[0057] In another embodiment of the present invention: A plug 74 is slidably inserted into the connecting sleeve 73, and a slot adapted to the plug 74 is provided on the connecting bar 72;

[0058] Wherein, the plug 74 is in a T shape, and a third spring is fixedly installed between the short arm end of the plug 74 and the connecting sleeve 73. When the active arm 4 is sleeved on the brake drive shaft 3, first, the connecting bar 72 is pressed into the brake drive shaft 3, then the active arm 4 can be smoothly sleeved on the brake drive shaft 3. Then, the connecting bar 72 is released. At this time, the first spring on the top plate 71 will push the connecting sleeve 73 to extend out of the brake drive shaft 3. At this time, the connecting bar 72 can be inserted into the connecting sleeve 73, and at the same time, the plug 74 is inserted into the slot. At this time, the connecting sleeve 73 and the connecting bar 72 will be connected together, and the third spring will always pull the plug 74 to be inserted into the slot, thereby preventing the plug 74 from falling off.

[0059] In another embodiment of the present invention: Both the active arm 4 and the driven arm 5 are hollow, and the inclined slot on the active arm 4 is inclined at 45°;

[0060] Wherein, the roller 77 is arranged in the inclined slot. When the brake is stepped on, the brake pedal will pull the pull rope 78 to move. At this time, the pull rope 78 will pull the roller 77 to move in the inclined slot. Due to the inclined setting of the inclined slot, the roller 77 will move downward in the inclined slot at this time. However, at the same time, the roller 77 will abut against the upper inclined wall surface of the inclined slot, thereby pulling the active arm 4 to rotate synchronously. However, at this time, since the roller 77 will initially move, the rotation amplitude of the active arm 4 is relatively small. After the roller 77 reaches the lower end of the inclined slot, the roller 77 will pull the active arm 4 to rotate significantly. At the same time, when the roller 77 moves downward, it will push the sliding plate 76 to move. At this time, the sliding plate 76 will drive the connecting sleeve 73 and the connecting bar 72 to move through the bottom frame 75. At this time, the connecting bar 72 will drive the top plate 71 to move, thereby driving the pulling block 69, the connecting block 67, and the inner moving block 66 to move, so that the inner moving block 66 can pull the winding block 61 to move through the latch 65 and the connecting rod 63;

[0061] When a tricycle driver makes an emergency brake, they usually quickly step on the brake pedal. At this time, the tricycle will brake urgently and quickly. However, in rural use scenarios, tricycle drivers rarely use protective measures such as wearing seat belts. When making an emergency brake, it is easy for the driver on the vehicle to be in danger. But in this application, when the driver subconsciously quickly steps on the pedal, when the pull rope 78 pulls the roller 77 to move, when the roller 77 drives the active arm 4 to rotate through the upper inclined wall of the inclined groove, since the roller 77 itself needs to displace within the inclined groove, the influence of the roller 77 on the rotation angle of the active arm 4 through the upper inclined wall of the inclined groove will be reduced at this time. As a result, in the initial stage of braking, the rotation amplitude of the active arm 4 is relatively small. At this time, the angle by which the active arm 4 drives the brake drive shaft 3 to rotate is relatively small, so that the braking wires connecting the rear wheels on the two driven arms 5 move a relatively small distance. In this way, the braking force of the brake disc is reduced, so that the braking force in the initial stage of emergency braking is relatively small. In this way, it brakes slightly first, and then after the vehicle has braked and the speed has decreased, subsequent large-scale braking is carried out, so as to reduce the impact of emergency braking on the driver and passengers in the vehicle;

[0062] A return spring is fixedly installed between the bottom end of the sliding plate 76 and the active arm 4, so that after the brake pedal is released, the return spring can push the sliding plate 76 to rise and reset.

[0063] In another embodiment of the present invention: baffles 41 are fixedly installed on the rear sides of both the active arm 4 and the driven arm 5;

[0064] The rear wheel braking wire passes through below the baffle 41 and is inserted into the through hole 31, so that the rear wheel braking wire is arranged in an L shape, so that the connection part between the rear wheel braking wire and the rear wheel braking component is as horizontal as possible, so that it is easier for the driven arm 5 to drive the rear wheel braking component to start when rotating;

[0065] The traditional connecting rod is replaced by the rear wheel braking wire, and both the rear wheel braking wire and the pull rope 78 are made of steel wire ropes. The connection between the pull rope 78 and the roller 77 can be connected by screws and nuts or other fixable methods;

[0066] A connecting groove is installed at the bottom end of one of the driven arms 5. A round wheel is installed in the connecting groove, and a handbrake wire is installed on the round wheel. The handbrake wire is connected to the handbrake component to facilitate the use of the handbrake, which is common in the braking system and will not be described further.

[0067] In another embodiment of the present invention: mounting plates 8 are fixedly installed on the active arm 4, the driven arm 5, and the bearing 2, and a threaded groove is provided on the brake drive shaft 3;

[0068] After the driving arm 4, the driven arm 5 and the bearing 2 are sleeved on the brake transmission shaft 3, the screw grooves are aligned with the screw grooves on the mounting plate 8. At this time, the driving arm 4, the driven arm 5 and the bearing 2 can be connected to the brake transmission shaft 3 by using screws.

[0069] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A brake transmission system for a tricycle, comprising a frame (1), a bearing (2) fixedly mounted on the frame (1), a brake transmission shaft (3) fixedly mounted on the inner ring of the bearing (2), characterized in that: An L-shaped active arm (4) and a driven arm (5) are mounted on the brake transmission shaft (3), and the two driven arms (5) are respectively mounted on both ends of the brake transmission shaft (3); Also includes: A winding block (61) is slidably mounted on the brake transmission shaft (3) and is used to wind and connect the brake line; A protrusion (62) is fixedly mounted on the winding block (61) to cooperate with the connection of the brake line; A connecting rod (63) is fixedly mounted on the protrusion (62) and extends into the interior of the brake transmission shaft (3); An inner moving block (66) and a connecting block (67), wherein a connecting spring (68) is fixedly installed between the inner moving block (66) and the connecting block (67), and the inner moving block (66) and the connecting block (67) are both slidably installed in the brake transmission shaft (3), and the connecting rod (63) is connected to the inner moving block (66) through a locking mechanism; An inclined groove is provided on the active arm (4), and a roller (77) is slidably mounted in the inclined groove; A slide plate (76) is slidably mounted on the active arm (4) and is located below the inclined slot, and an inward-retracting mechanism is provided between the slide plate (76) and the connecting block (67); During the active braking process, as the pull rope (78) pulls the roller (77) to move, the roller (77) will drive the driven arm (5) to rotate through the active arm (4) to brake the two rear wheels. At the same time, when the roller (77) moves in the inclined groove, it will tighten the brake lines on the two driven arms (5) again to coordinate braking, thereby avoiding biased braking.

2. A tricycle brake transmission system according to claim 1, characterized in that: The retracting mechanism comprises a bottom frame (75) fixedly mounted on a slide plate (76), a connecting sleeve (73) fixedly mounted on the bottom frame (75), a connecting strip (72) slidably mounted along a radial direction of the brake transmission shaft (3), and the connecting strip (72) is inserted into the connecting sleeve (73) so that the two are connected; A top plate (71) is fixedly mounted on the connecting strip (72); A pulling block (69) is fixedly mounted on one end of the two connecting blocks (67) close to each other, and both ends of the top plate (71) are respectively inserted into the two pulling blocks (69), and the pulling blocks (69) are provided with a bevel.

3. A tricycle brake transmission system according to claim 2, characterized in that: The top plate (71) is in a concave shape, and a first spring is fixedly installed between the upper surface of the top plate (71) and the inner wall of the brake transmission shaft (3).

4. A tricycle brake transmission system according to claim 1, characterized in that: The locking mechanism comprises a clamping block (65) slidably mounted on the connecting rod (63); the clamping block (65) is L-shaped, and one end of the clamping block (65) away from the connecting rod (63) is provided with a chamfer; The short arm end of the clamping block (65) extends from the bottom end of the connecting rod (63) and is inserted into the inner moving block (66). The inner moving block (66) is provided with a plurality of clamping grooves. A second spring is fixedly installed between the bottom end of the clamping block (65) and the connecting rod (63).

5. A tricycle brake transmission system according to claim 1, characterized in that: The winding block (61) is in an "H" shape, and the protrusion (62) is in a "concave" shape; The brake transmission shaft (3) is provided with a through hole (31), and a locking screw (64) is threadedly inserted into the protrusion (62).

6. A tricycle brake transmission system according to claim 2, characterized in that: An insert block (74) is slidably inserted on the connecting sleeve (73), and a slot matching the insert block (74) is provided on the connecting strip (72).

7. A tricycle brake transmission system according to claim 1, characterized in that: The active arm (4) and the driven arm (5) are both hollow, and the inclined groove on the active arm (4) is inclined at 45 degrees.

8. A tricycle brake transmission system according to claim 1, characterized in that: Baffles (41) are fixedly mounted on the rear sides of the active arm (4) and the driven arm (5).

9. A tricycle brake transmission system according to claim 1, characterized in that: The active arm (4), the driven arm (5) and the bearing (2) are all fixedly mounted with mounting plates (8), and a screw groove is provided on the brake transmission shaft (3).

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