Brake transmission brake axle structure of tricycle

Abstract

The utility model discloses a tricycle brake transmission brake axle structure, which relates to the technical field of tricycle brake axles, has the advantage that a bearing body can be mounted on the outer wall of a transmission shaft without mounting a positioning block, and is characterized by comprising the transmission shaft with a polygonal longitudinal section and bearing components symmetrically arranged at two ends of the transmission shaft, the bearing assembly comprises a bearing seat fixed on the frame, a bearing body is mounted in the bearing seat, and the inner wall of an inner ring of the bearing body is a polygonal hole matched with the outer wall of the transmission shaft.

Description

Technical Field

[0001] This utility model relates to the field of tricycle brake shaft technology, specifically a tricycle brake transmission brake shaft structure. Background Technology

[0002] A tricycle is a combination of a human-powered vehicle and a bicycle, and can be divided into human-powered tricycles, electric tricycles, children's tricycles, and battery-powered tricycles. A tricycle consists of two parts: a front wheel that can be turned, a handlebar, a bell, brakes, pedals, and a seat, and a chain that drives the rear wheel.

[0003] Electric tricycles, as a means of transportation for carrying people and goods, are widely used in various short-distance transportation scenarios such as daily commuting, field transport, express mail delivery, and factory relocation due to their energy-saving, environmentally friendly, and maneuverable characteristics. In these applications, the braking system needs to be used frequently due to factors such as riding conditions and operating environment, making the brake axle a crucial component of the braking system.

[0004] Chinese Patent CN221163183U discloses a novel detachable bearing-driven brake shaft for a tricycle. The shaft includes a brake drive shaft with concentric components symmetrically arranged on its outer edge. Each concentric component includes a hollow bearing housing. An inner ring is positioned at the axial center of the bearing housing. A bearing body is positioned between the outer edge of the inner ring and the inner edge of the bearing housing, and the inner ring is fitted onto the outer edge of the brake drive shaft. Trapezoidal positioning grooves are arranged in a ring array on the inner edge of the inner ring. Positioning blocks are arranged in a ring array on the outer edge of the brake drive shaft corresponding to the concentric components. These positioning blocks are locatingly inserted into the positioning grooves. A fixing plate is connected to one end of the bearing housing, and fixing holes are symmetrically arranged within the fixing plate.

[0005] However, the existing structure requires an inner ring when installing the bearing body, and a positioning groove needs to be made on the inner ring. A positioning block needs to be set on the outer wall of the drive shaft to install the inner ring shaft and the bearing body. Therefore, positioning blocks need to be set on the outer wall of the corresponding bearing body on the drive shaft. Setting multiple positioning blocks on the drive shaft requires welding or machining. Furthermore, if the positioning block does not correspond to the positioning groove, the bearing body cannot be installed on the drive shaft.

[0006] Therefore, the applicant has developed a new technical solution in the actual production process to solve the above-mentioned technical problems. Utility Model Content

[0007] To address the aforementioned technical shortcomings, the purpose of this utility model is to provide a brake transmission brake shaft structure for a tricycle, which has the advantage of allowing the bearing body to be installed without the need for a positioning block on the outer wall of the transmission shaft.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This utility model provides a brake transmission brake shaft structure for a three-wheeled vehicle, including a transmission shaft with a polygonal longitudinal section and bearing assemblies symmetrically arranged at both ends of the transmission shaft;

[0010] The bearing assembly includes a bearing housing fixed to the vehicle frame, and a bearing body is installed inside the bearing housing. The inner wall of the inner ring of the bearing body is a polygonal hole that mates with the outer wall of the drive shaft.

[0011] By adopting the above technical solution, the polygonal hole in the inner ring of the bearing body matches the polygonal drive shaft, allowing the bearing body to be installed on the drive shaft without the need for positioning blocks, i.e., without drilling holes or setting other structures on the drive shaft. The bearing body can be installed on the drive shaft without any machining of the drive shaft, thus preventing damage to the drive shaft caused by grooving or drilling, which would affect the life of the drive shaft and ensure the torque force of the drive shaft.

[0012] Preferably, the outer wall of the bearing housing is provided with a rectangular plate, the side of which is welded to the vehicle frame or the plate surface is bolted to the vehicle frame.

[0013] Preferably, the polygonal drive shaft is a drive shaft with a hexagonal or hexagonal cross-section, and the polygonal hole is a hexagonal hole;

[0014] The number of bearing assemblies is three, located at both ends and the middle of the drive shaft, respectively.

[0015] Preferably, both ends of the drive shaft are provided with driven brake rocker arms, each bearing assembly is located between two driven brake rocker arms, and the bearing assemblies of the driven brake rocker arms are distributed near the ends of the drive shaft. The driven brake rocker arms are detachably connected to the drive shaft, and polygonal mounting holes are provided on the driven brake rocker arms for the drive shaft to pass through.

[0016] The driven brake rocker arm has a notch above the drive shaft, and the driven brake rocker arm has protrusions at opposite ends of the notch. The two protrusions are connected by bolts, and the notch communicates with the mounting hole.

[0017] Preferably, the drive shaft has an active brake rocker arm between the two driven brake rocker arms. The active brake rocker arm has a through hole for the drive shaft to pass through. The inner wall of the through hole fits with the outer wall of the drive shaft. The active brake rocker arm has a notch two above the drive shaft. The active brake rocker arm has protrusions two that are relatively distributed at opposite ends of the notch two. The two protrusions two are connected by bolts two. The notch two communicates with the through hole.

[0018] Preferably, after the bearing body is installed on the drive shaft, a plurality of locking holes are provided in the polygonal hole, and a compression spring is provided at the bottom of each locking hole. Each compression spring has an abutting ball at the end away from the locking hole that abuts against the outer wall of the drive shaft. The abutting ball is slidably connected in the locking hole and is located in the locking hole when it abuts against the outer wall of the drive shaft.

[0019] Preferably, the outer wall of the drive shaft, the outer surface of the driven brake rocker arm, and the outer surface of the active brake rocker arm are all provided with a galvanized layer.

[0020] Preferably, the inner ring of the bearing body is coaxially provided with an extension cylinder that is sleeved on the outer wall of the transmission shaft, and in this case, the locking hole, compression spring, and abutment ball are arranged on the extension cylinder.

[0021] Preferably, the structure of the driven brake rocker arm and the active brake rocker arm is replaced with an integrally formed sheet metal part. The driven brake rocker arm includes two oppositely distributed plates. The upper ends of the two opposite plates are connected by two arc-shaped connecting rings. There is a gap between the two connecting rings and bolts pass through the two connecting rings. The mounting hole is opened on the two opposite plates and the mounting hole communicates with the gap between the two arc-shaped connecting rings.

[0022] Two opposing plates are provided with a connecting arm 1 and a connecting arm 2. The connecting arm 1 and the connecting arm 2 are distributed at a certain angle. The ends of the connecting arm 1 and the connecting arm 2 that are distributed oppositely are close to each other on the opposing plate 1, while the other ends are distributed away from each other. The two oppositely distributed connecting arms 1 or connecting arm 2 are connected by bolts 3 at the part that is close to each other.

[0023] The active braking rocker arm includes two opposing plates, the upper ends of which are connected by two arc-shaped connecting rings. There is a gap between the two connecting rings and bolts pass through the two connecting rings. The through hole is opened on the two opposing plates and is connected to the gap between the two arc-shaped connecting rings.

[0024] Each of the two opposing plates is provided with a connecting arm three. The two oppositely distributed connecting arms three are close to each other at one end and far apart at the other end. The two oppositely distributed connecting arms three are connected by bolts four at the part where they are close to each other.

[0025] Preferably, the connecting arm 1 or connecting arm 2 has two threaded holes for the bolt 3 to pass through, and the diameter of the threaded hole 1 closer to the opposite plate 1 is smaller than the diameter of the other threaded hole 1; the connecting arm 3 has two threaded holes for the bolt 3 to pass through, and the diameter of the threaded hole 2 closer to the opposite plate 2 is smaller than the diameter of the other threaded hole 2.

[0026] The beneficial effects of this utility model are as follows: the polygonal hole in the inner ring of the bearing body cooperates with the polygonal drive shaft, so that the bearing body can be installed on the drive shaft without setting a positioning block, that is, without drilling holes or setting other structures on the drive shaft. The bearing body can be installed on the drive shaft without any machining of the drive shaft, thus preventing damage to the drive shaft caused by grooving or drilling, affecting the life of the drive shaft, and ensuring the torque force of the drive shaft. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0029] Figure 2 This is a schematic diagram illustrating the structure of the polygonal hole in this embodiment;

[0030] Figure 3 This is a schematic diagram illustrating the structure of the contact ball in this embodiment;

[0031] Figure 4 and Figure 5 This is a schematic diagram illustrating the structure of the driven brake rocker arm in this embodiment;

[0032] Figure 6 This is a schematic diagram illustrating the structure of the active braking rocker arm in this embodiment.

[0033] Explanation of reference numerals in the attached figures:

[0034] In the diagram: 1. Drive shaft; 11. Bearing housing; 12. Bearing body; 121. Polygonal hole; 13. Rectangular plate; 14. Driven brake rocker arm; 141. Mounting hole; 142. Notch 1; 143. Protrusion 1; 144. Bolt 1; 15. Active brake rocker arm; 151. Through hole; 152. Notch 2; 153. Protrusion 2; 154. Bolt 2; 16. Locking hole; 161. Compression spring; 162. Abutting ball; 17. Extension cylinder; 18. Opposite plate 1; 181. Connecting ring 1; 182. Connecting arm 1; 183. Connecting arm 2; 184. Opposite plate 2; 185. Connecting ring 2; 186. Connecting arm 3; 187. Threaded hole 1; 188. Threaded hole 2. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] A brake transmission brake shaft structure for a three-wheeled vehicle, such as Figure 1 and Figure 2 It includes a drive shaft 1 with a polygonal longitudinal section and bearing assemblies symmetrically arranged at both ends of the drive shaft 1;

[0037] like Figure 1 and Figure 2 The bearing assembly includes a bearing housing 11 fixed on the frame, and a bearing body 12 coaxially mounted inside the bearing housing 11. The inner wall of the inner ring of the bearing body 12 is a polygonal hole 121 that mates with the outer wall of the drive shaft 1.

[0038] like Figure 1 and Figure 2 The polygonal hole 121 in the inner ring of the bearing body 12 mates with the polygonal drive shaft 1, allowing the bearing body 12 to be mounted on the drive shaft 1 without the need for positioning blocks, i.e., without drilling holes or other structures on the drive shaft 1. This ingenious structure ensures the drive shaft 1 remains unprocessed, preventing damage from slotting or drilling that could affect its lifespan and guaranteeing its torque capacity. The outer wall of the drive shaft 1, the outer surface of the driven brake rocker arm 14, and the outer surface of the active brake rocker arm 15 are all galvanized. This galvanizing improves the lifespan and corrosion resistance of the drive shaft 1, driven brake rocker arm 14, and active brake rocker arm 15, making them particularly suitable for outdoor and humid environments. The driven brake rocker arm 14 and active brake rocker arm 15 can be sheet metal parts formed by stamping and bending, facilitating mass production.

[0039] like Figure 1 and Figure 2 The bearing housing 11 has a rectangular plate 13 on its outer wall. The sides of the rectangular plate 13 are welded to the frame, or the plate surface is bolted to the frame. This rectangular plate 13 facilitates welding the bearing housing 11 to the frame. Alternatively, the rectangular plate 13 can also be bolted to the frame, in which case the plate surface is bolted to the frame body. Therefore, the installation method of the rectangular plate 13 and the frame can be selected according to requirements.

[0040] like Figure 1 and Figure 2Preferably, the polygonal drive shaft 1 is a drive shaft 1 with a hexagonal or hexagonal cross section, and the polygonal hole 121 is a hexagonal hole; the drive shaft 1 with a hexagonal cross section is a hollow shaft, and the two ends of the hollow shaft can be sealed by sealing blocks; the drive shaft 1 with a hexagonal cross section is a solid shaft.

[0041] like Figure 1 and Figure 2 There are three bearing assemblies, located at both ends and the middle of driveshaft 1. Compared to two bearing assemblies, the three bearing assemblies increase the connection strength between driveshaft 1 and the frame, resulting in more stable braking.

[0042] like Figure 1 and Figure 2 Both ends of the drive shaft 1 are provided with driven brake rocker arms 14, and each bearing assembly is located between the two driven brake rocker arms 14. The bearing assemblies of the driven brake rocker arms 14 are distributed near the end of the drive shaft 1. The driven brake rocker arms 14 are detachably connected to the drive shaft 1. A polygonal mounting hole 141 for the drive shaft 1 to pass through is provided on the driven brake rocker arms 14.

[0043] like Figure 1 and Figure 2 The driven brake rocker arm 14 has a notch 142 above the drive shaft 1, and each end of the driven brake rocker arm 14 has a protrusion 143 that is relatively distributed. The two protrusions 143 are connected by bolts 144, and the notch 142 communicates with the mounting hole 141. The protrusions 143, the notch 142, and the mounting hole 141 form a clamp. After the drive shaft 1 is inserted into the mounting hole 141, the bolts 144 connect the two protrusions 143 together, thereby fixing the driven brake rocker arm 14 to the drive shaft 1. At this time, the nut and bolt of the bolt 144 are located on opposite sides of the two protrusions 143 and are in contact with the two protrusions 143. Tightening the nut will squeeze the two protrusions 143 closer together, and the drive shaft 1 will be stably installed in the mounting hole 141. At this time, the polygonal shape of the drive shaft 1 also cooperates with the installation of the driven brake rocker arm 14, making the installation of the driven brake rocker arm 14 simple and convenient.

[0044] like Figure 1 and Figure 2The drive shaft 1 has an active brake rocker arm 15 between two driven brake rocker arms 14. The active brake rocker arm 15 has a through hole 151 for the drive shaft 1 to pass through. The inner wall of the through hole 151 fits with the outer wall of the drive shaft 1. The active brake rocker arm 15 has a notch 152 above the drive shaft 1. The active brake rocker arm 15 has protrusions 153 that are relatively distributed at opposite ends of the notch 152. The two protrusions 153 are connected by bolts 154. The notch 152 communicates with the through hole 151. The notch 152, the through hole 151, and the two protrusions 153 form a clamp, which facilitates the installation of the active brake rocker arm 15 on the drive shaft 1 after the drive shaft 1 is inserted through the through hole 151. The nut and bolt 154 are located on opposite sides of the two protrusions 153 and abut against the two protrusions 153. Tightening the nut at this time will reduce the distance between the two protrusions 153, thereby allowing the active brake rocker arm 15 to be installed on the drive shaft 1. The installation is simple and convenient.

[0045] like Figure 1 and Figure 2 and Figure 3 After the bearing body 12 is installed on the drive shaft 1, several locking holes 16 are opened in the polygonal hole 121. Each locking hole 16 has a compression spring 161 at its bottom. Each compression spring 161 has an abutting ball 162 at its end away from the locking hole 16, which abuts against the outer wall of the drive shaft 1. The abutting ball 162 is slidably connected in the locking hole 16, and when the abutting ball 162 abuts against the outer wall of the drive shaft 1, the abutting ball 162 is located in the locking hole 16. When the drive shaft 1 passes through the inner ring of the bearing, the abutting ball 162 abuts against the outer wall of the drive shaft 1 under the action of the compression spring 161. At this time, the compression spring 161 is in a compressed state, which makes the connection between the drive shaft 1 and the bearing body 12 stable. When the compression spring 161 is in its original state, and the drive shaft 1 has not entered the inner ring of the bearing body 12, the outer wall of the contact ball 162 extends out of the outer wall of the locking hole 16, and the extended part is less than half the size of the contact ball 162, so that the drive shaft 1 can squeeze the contact ball 162 into the locking hole 16, and then abut against the outer wall of the drive shaft 1 under the action of the compression spring 161.

[0046] like Figure 1 and Figure 3Furthermore, an extension cylinder 17, which is coaxially fitted onto the outer wall of the drive shaft 1, is provided on the inner ring of the bearing body 12. At this time, the locking hole 16, the compression spring 161, and the abutment ball 162 are all provided on the extension cylinder 17, and the inner wall of the extension cylinder 17 mates with the outer wall of the drive shaft 1. In addition, one end of the locking hole 16 can extend out of the outer wall of the extension cylinder 17, which facilitates the internal thread connection of the locking hole 16 to the adjusting block. The end of the compression spring 161 away from the abutment ball 162 is fixedly connected to the adjusting block. By changing the position of the adjusting block in the locking hole 16, the compressive force applied by the compression spring 161 to the abutment ball 162 can be changed, thereby facilitating the adjustment of the locking force applied to the outer wall of the drive shaft 1.

[0047] Or, such as Figure 4 and Figure 5 and Figure 6 The structure of the driven brake rocker arm and the active brake rocker arm is replaced with a one-piece sheet metal part. The driven brake rocker arm includes two oppositely distributed plates. The upper ends of the two opposite plates are connected by two arc-shaped connecting rings. The two connecting rings are located at the two ends of the opposite plates respectively. There is a gap between the two connecting rings and the bolts pass through the two connecting rings. The mounting holes are opened on the two opposite plates and are connected to the gap between the two arc-shaped connecting rings. At this time, the bolts pass through the two connecting rings, so that the nuts and bolts on the bolts abut against the opposite sides of the two connecting rings respectively. Tighten the nuts. Since the mounting holes are connected to the gap between the two arc-shaped connecting rings, it is easy to press the opposite plates onto the drive shaft.

[0048] like Figure 4 and Figure 5 and Figure 6 Each of the two opposing plates has a connecting arm 1 and a connecting arm 2, which are distributed at a certain angle. The ends of the two opposing connecting arms 1 and 2, which are close to the opposing plate 1, are pressed together, while the other ends are distributed away from each other. The two opposing connecting arms 1 or 2 are connected by bolts 3 at the points where they are pressed together. The connecting arm 1, connecting arm 2, connecting ring 1, and opposing plate 1 are manufactured as a single piece by stamping and bending. After the connecting arm 2 of one of the two driven brake rocker arms is pressed together at the end close to the opposing plate 1, it is not distributed away from each other, which is convenient for practical connection applications.

[0049] like Figure 4 and Figure 5 and Figure 6 The active braking rocker arm includes two opposing plates, the upper ends of which are connected by two arc-shaped connecting rings. There is a gap between the two connecting rings and bolts pass through the two connecting rings. Through holes are opened on the two opposing plates and the through holes communicate with the gap between the two arc-shaped connecting rings.

[0050] like Figure 4 and Figure 5 and Figure 6 Each of the two opposing plates has a connecting arm three. The ends of the connecting arms three, which are relatively close to each other on the opposing plates, are in contact with each other, while the other ends are far apart from each other. The two opposing connecting arms three are connected at the contacting part by bolts four. The connecting arms three facilitate connection with the foot brake cable.

[0051] like Figure 4 and Figure 5 and Figure 6 Two threaded holes are provided on connecting arm one or connecting arm two for bolt three to pass through. The diameter of the threaded hole one closer to the opposite plate one is smaller than the diameter of the other threaded hole one. The purpose of this design is to increase the strength of connecting arm one or connecting arm two, making the connection more stable and facilitating the transmission of force between connecting arm one and connecting arm two. Two threaded holes are provided on connecting arm three for bolt three to pass through. The diameter of the threaded hole two closer to the opposite plate two is smaller than the diameter of the other threaded hole two. The function is the same as the above effect, and will not be elaborated here.

[0052] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A brake transmission brake shaft structure for a three-wheeled vehicle, characterized in that, It includes a drive shaft (1) with a polygonal longitudinal section and bearing assemblies symmetrically arranged at both ends of the drive shaft (1); The bearing assembly includes a bearing housing (11) fixed on the frame, and a bearing body (12) is installed inside the bearing housing (11). The inner wall of the inner ring of the bearing body (12) is a polygonal hole (121) that mates with the outer wall of the drive shaft (1).

2. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 1, characterized in that, The outer wall of the bearing seat (11) is provided with a rectangular plate (13), the side of the rectangular plate (13) is welded to the frame or the plate surface is bolted to the frame.

3. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 1, characterized in that, The polygonal drive shaft (1) is a drive shaft (1) with a hexagonal or hexagonal cross section, and the polygonal hole (121) is a hexagonal hole; The number of bearing assemblies is three, located at both ends and the middle of the drive shaft (1).

4. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 1, characterized in that, Both ends of the drive shaft (1) are provided with driven brake rocker arms (14), each bearing assembly is located between the two driven brake rocker arms (14), and the driven brake rocker arms (14) are distributed close to the bearing assemblies at the end of the drive shaft (1). The driven brake rocker arms (14) are detachably connected to the drive shaft (1), and the driven brake rocker arms (14) are provided with polygonal mounting holes (141) for the drive shaft (1) to pass through. The driven brake rocker arm (14) has a notch (142) above the drive shaft (1), and the driven brake rocker arm (14) has protrusions (143) distributed at opposite ends of the notch (142). The two protrusions (143) are connected by bolts (144), and the notch (142) is connected to the mounting hole (141).

5. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 4, characterized in that, The drive shaft (1) has an active brake rocker arm (15) between two driven brake rocker arms (14). The active brake rocker arm (15) has a through hole (151) for the drive shaft (1) to pass through. The inner wall of the through hole (151) is in contact with the outer wall of the drive shaft (1). The active brake rocker arm (15) has a notch (152) above the drive shaft (1). The active brake rocker arm (15) has two protrusions (153) that are relatively distributed at opposite ends of the notch (152). The two protrusions (153) are connected by bolts (154). The notch (152) is connected to the through hole (151).

6. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 1, characterized in that, After the bearing body (12) is installed on the drive shaft (1), a plurality of locking holes (16) are provided in the polygonal hole (121). Each locking hole (16) has a compression spring (161) at the bottom. Each compression spring (161) has a contact ball (162) at one end away from the locking hole (16) that abuts against the outer wall of the drive shaft (1). The contact ball (162) is slidably connected in the locking hole (16) and when the contact ball (162) abuts against the outer wall of the drive shaft (1), the contact ball (162) is located in the locking hole (16).

7. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 1, characterized in that, The outer wall of the drive shaft (1), the outer surface of the driven brake rocker arm (14), and the outer surface of the active brake rocker arm (15) are all provided with a galvanized layer.

8. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 6, characterized in that, An extension cylinder (17) is coaxially provided on the inner ring of the bearing body (12) and sleeved on the outer wall of the transmission shaft (1). At this time, the locking hole (16), compression spring (161), and abutment ball (162) are provided on the extension cylinder (17).

9. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 5, characterized in that, The structure of the driven brake rocker arm (14) and the active brake rocker arm (15) is replaced by an integrally formed sheet metal part. The driven brake rocker arm (14) includes two oppositely distributed plates. The upper ends of the two opposite plates are connected by two arc-shaped connecting rings. There is a gap between the two connecting rings and the bolts (144) pass through the two connecting rings. The mounting hole (141) is opened on the two opposite plates and the mounting hole (141) is connected to the gap between the two arc-shaped connecting rings. Two opposing plates are provided with a connecting arm 1 and a connecting arm 2. The connecting arm 1 and the connecting arm 2 are distributed at a certain angle. The ends of the connecting arm 1 and the connecting arm 2 that are distributed oppositely are close to each other on the opposing plate 1, while the other ends are distributed away from each other. The two oppositely distributed connecting arms 1 or connecting arm 2 are connected by bolts 3 at the part that is close to each other. The active braking rocker arm (15) includes two opposing plates, the upper ends of which are connected by two arc-shaped connecting rings. There is a gap between the two connecting rings and bolts (154) pass through the two connecting rings. The through hole (151) is opened on the two opposing plates and the through hole (151) is connected to the gap between the two arc-shaped connecting rings. Each of the two opposing plates is provided with a connecting arm three. The two oppositely distributed connecting arms three are close to each other at one end and far apart at the other end. The two oppositely distributed connecting arms three are connected by bolts four at the part where they are close to each other.

10. The brake transmission brake shaft structure for a three-wheeled vehicle as described in claim 9, characterized in that, The connecting arm 1 or connecting arm 2 has two threaded holes for bolt 3 to pass through, and the diameter of the threaded hole 1 closer to the opposite plate 1 is smaller than the diameter of the other threaded hole 1; the connecting arm 3 has two threaded holes for bolt 3 to pass through, and the diameter of the threaded hole 2 closer to the opposite plate 2 is smaller than the diameter of the other threaded hole 2.

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