Brake piping structure for straddle-type vehicle and motorcycle

Abstract

The present invention relates to a brake piping structure for a straddle-type vehicle and a motorcycle. The brake piping structure includes a vehicle frame, a swing arm, and brake piping. The vehicle frame is connected to a pivot. The swing arm has a cylindrical portion that is rotatably mounted on the pivot. A pipe fixing portion is provided on the surface of the cylindrical portion. The brake piping is used to transmit the hydraulic pressure generated by an ABS modulator to a rear brake caliper of a rear wheel. The brake piping includes a free pipe section and a fixed pipe section that are connected to each other. The free pipe section extends from the ABS modulator toward the pivot and is fixed to the pipe fixing portion. The fixed pipe section is fixed to the swing arm. The fixed pipe section extends in a curved manner from the cylindrical portion to the upper surface of the swing arm and is connected to the rear brake caliper from above the swing arm. The brake piping structure for a straddle-type vehicle and the motorcycle of the present invention can reduce contact friction or interference with other components and eliminate the need for a large number of restrictive components, thereby improving the appearance and aesthetics.

Description

Technical Field

[0001] The present invention relates to the technical field of straddle-type vehicles, and in particular to a brake piping structure of a straddle-type vehicle and a motorcycle. Background Art

[0002] In a known brake piping structure for a straddle-type vehicle, a structure is known in which an ABS modulator that generates brake fluid pressure and a brake caliper that generates braking force on wheels by supplying fluid pressure are connected via brake piping.

[0003] In existing brake piping structures, the piping runs along the rear frame and the surface of the swing arm. This causes the piping to swing with the arm, causing wear and possible interference with surrounding components. To prevent this undesirable contact and interference, numerous stoppers are required, increasing the number of parts and assembly time, while also compromising the aesthetics of the vehicle. Summary of the Invention

[0004] Based on this, a brake piping structure for a straddle-type vehicle and a motorcycle are provided to solve the problem of how to reduce contact friction or interference between the brake piping and other components and reduce the use of restrictive components to improve the appearance.

[0005] In one aspect, the present invention provides a brake piping structure for a straddle-type vehicle, comprising:

[0006] a frame connected with a pivot;

[0007] a swing arm having a cylindrical portion, the cylindrical portion being rotatably sleeved on the pivot shaft so that the swing arm can rotate relative to the frame about the pivot shaft, and a tube fixing portion being provided on a surface of the cylindrical portion;

[0008] A brake pipe is used to transmit the hydraulic pressure generated by the ABS modulator to the rear brake caliper of the rear wheel, the brake pipe including a free pipe section and a fixed pipe section connected to each other, the free pipe section extending from the ABS modulator to the pivot and fixed to the pipe fixing portion, the fixed pipe section fixed to the swing arm, the fixed pipe section extending in a curved manner from the cylindrical portion to the upper surface of the swing arm, and connected to the rear brake caliper from above the swing arm.

[0009] The brake piping structure of the above-mentioned straddle-type vehicle is characterized in that the swing arm is rotatably connected to the pivot on the frame through its cylindrical portion, and a pipe fixing portion is provided on the surface of the cylindrical portion. The brake piping includes a free pipe section and a fixed pipe section connected to each other, the free pipe section extends from the ABS modulator to the pivot and is fixed to the pipe fixing portion, and the fixed pipe section is fixed to the swing arm. The fixed pipe section extends from the cylindrical portion in a curved manner to the upper surface of the swing arm and is connected to the rear brake caliper from the top of the swing arm. Since the pipe fixing portion is located in the cylindrical portion corresponding to the pivot, during the rotation of the swing arm around the pivot, the free pipe section (with small displacement) connected to the pipe fixing section with the cylindrical portion and the fixed pipe section (with no relative movement relative to the swing arm) will not have a large relative displacement relative to the swing arm. In this way, the free pipe section of the brake piping will not have a large range of movement, and will not wear or interfere with the swing arm in movement. The fixed pipe section, since it is fixed to the swing arm, can move with the swing arm and will not wear or interfere with movement. Therefore, the brake piping structure of the present invention can reduce contact friction or interference with other components as a whole, and does not need to provide a large number of restricting components, thereby improving the aesthetic appearance.

[0010] In one embodiment, the tube fixing portion is located approximately in the middle of the cylindrical portion. Thus, the ABS modulator is mounted on the vehicle frame in the middle of the cylindrical portion to maintain the frame's weight balance in the vehicle width direction. With this structural arrangement, the free section of the brake piping leading from the ABS modulator can be curved to facilitate connection with the tube fixing portion.

[0011] In one embodiment, at least one pipe clamp is included, and the fixed pipe section is fixed to the swing arm via the at least one pipe clamp, thereby improving the connection stability between the fixed pipe section and the swing arm by using the pipe clamp.

[0012] In one embodiment, the free tube section is a flexible tube. This allows the free tube section to adaptively deform in a flexible manner when subjected to force to reduce stress. As the swing arm rotates about the pivot, the free tube section can deform in a flexible manner to reduce stress generated by the cylindrical portion, thereby maintaining smooth movement of the swing arm.

[0013] In one embodiment, the free pipe section is a rubber hose. In this way, the free pipe section can be maintained in a certain bending shape without setting a limiting component, thereby compensating for the defect that it is difficult to set a limiting component on the free pipe section.

[0014] In one embodiment, the fixed pipe section is formed of a rubber hose. Thus, the fixed pipe section is easily bent. Therefore, when the swing arm swings about the pivot, the fixed pipe section fixed to the swing arm does not generate a load that hinders the movement of the swing arm, allowing the swing arm to swing smoothly about the pivot.

[0015] In one embodiment, the oil outlet of the ABS modulator is located at the upper rear portion of the cylindrical portion. One end of the free pipe segment is connected to the oil outlet, and the other end is connected to the pipe fixing portion. This arrangement allows the free pipe segment of the brake piping to be located substantially above and behind the pivot, occupying less space and being close to the pivot. This prevents the free pipe segment from significantly moving due to the swing arm's rotation around the pivot, resulting in better stability of the free pipe segment, less contact wear with structural components near the pivot, and reduced potential for motion interference.

[0016] In one embodiment, the tube fixing portion includes a hook and a tube connector. The hook secures the tube connector to the cylindrical portion, and the tube connector connects the free tube segment to the fixed tube segment. The hook conveniently connects the tube connector to the cylindrical portion, facilitating assembly and disassembly of the brake piping and reducing assembly time. Because the tube fixing portion is located on the cylindrical portion corresponding to the pivot, neither the free tube segment nor the fixed tube segment experiences significant relative displacement relative to the swing arm during pivotal rotation of the swing arm, minimizing wear or interference between the brake piping and the swing arm.

[0017] In one embodiment, the outlet directions of the two ends of the free pipe section are substantially parallel, resulting in a U-shaped bend. As a result, when the swing arm pivots, the location where the free pipe section connects to the cylindrical portion rotates slightly. Because the portion of the free pipe section corresponding to the cylindrical portion extends along the length of the cylindrical portion, the free pipe section does not deform significantly, significantly reducing contact wear and motion interference, thereby maintaining the stability of the brake piping.

[0018] In another aspect, the present invention provides a motorcycle including the above-mentioned brake piping structure for a straddle-type vehicle.

[0019] The above-mentioned motorcycle adopts the brake piping structure of the above-mentioned straddle-type vehicle. Therefore, during the rotation of the swing arm around the pivot, the free pipe section and the fixed pipe section connected to the cylindrical portion of the pipe fixing portion will not undergo large relative displacement relative to the swing arm, thereby reducing wear or movement interference between the brake piping and the swing arm, and eliminating the need for a large number of restrictive components, thereby improving the appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a motorcycle according to one embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the brake piping structure of a motorcycle according to one embodiment of the present invention;

[0022] Figure 3 A schematic diagram of a partial structure of a brake piping structure according to an embodiment of the present invention;

[0023] Figure 4 A schematic top view of a partial structure of a brake piping structure according to an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the brake piping structure in the related art;

[0025] Figure 6 FIG1 is a schematic diagram of the movement of the brake piping when the swing arm rotates around the pivot in the brake piping structure according to one embodiment of the present invention;

[0026] Figure 7 for Figure 6 A magnified schematic diagram of the local structure;

[0027] Figure 8 Schematic diagram of the brake piping structure according to one embodiment of the present invention when viewed from the front and rear sides.

[0028] Description of Figure Numbers:

[0029] 100. Straddle-type vehicle; 101. Frame; 102. Front fork; 103. Front wheel; 104. Handlebars; 105. Fuel tank; 106. Seat; 107. Engine; 108. Swing arm; 108a. Cylinder; 108b. Pipe fixing portion; 109. Carburetor; 110. Front fender; 111. Rear fender; 112. Rear wheel; 101a. Stem pipe; 101b. Pivot; 201. Brake pipe; 201a. Free pipe section; 201b. Fixed pipe section; 202. ABS modulator; 202a. Oil outlet; 203. Rear brake caliper; 204. Pipe clamp; 205. Pipe connector. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying 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 should not be understood as limiting the present invention.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0036] See Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a brake piping structure for a straddle-type vehicle 100 , where the straddle-type vehicle 100 includes but is not limited to a motorcycle and an electric motorcycle.

[0037] The straddle-type vehicle 100 includes a front fork 102 connected to a frame 101, a front wheel 103, and a handlebar 104. Specifically, the front wheel 103 is connected to the front fork 102, which is connected to a handlebar 104. The front fork 102 is connected to a stem tube 101a located at the front end of the frame 101. Operating the handlebar 104 allows the front fork 102 to rotate within the stem tube 101a, thereby steering the front wheel 103. A fuel tank 105 is mounted astride the upper portion of the frame 101, a seat 106 is mounted on the upper rear portion of the frame 101, an engine 107 is connected to the lower front portion of the frame 101, a swing arm 108 is connected to the lower rear portion of the frame 101, and is suspended from the frame 101 via a rear shock absorber (not shown). A rear wheel 112 is connected to the rear end of the swing arm 108.

[0038] The intake system of engine 107 includes a fuel-air metering device such as a carburetor 109, an intake pipe, and an air filter. The exhaust system of engine 107 consists of an exhaust pipe and a muffler. The straddle-type vehicle 100 is also equipped with side covers that cover the sides of the frame 101, a seat cover that covers the rear portion of the frame 101 below the seat 106, a front fender 110 that covers the top of the front wheel 103, and a rear fender 111 that covers the top of the rear wheel 112. Drive from engine 107 is transmitted from engine 107 to a driven wheel sprocket mounted on the rear wheel hub of the rear wheel 112 assembly.

[0039] The following describes the brake piping structure of the straddle-type vehicle 100, taking a motorcycle as an example.

[0040] The brake piping structure includes a brake piping 201 provided to the vehicle frame 101 and a swing arm 108. The vehicle frame 101 is connected to a pivot 101b. The swing arm 108 has a cylindrical portion 108a that is rotatably mounted on the pivot 101b, allowing the swing arm 108 to rotate relative to the vehicle frame 101 about the pivot 101b. In this manner, the swing arm 108 is supported by the pivot 101b and suspended from the vehicle frame 101 in a freely swingable manner.

[0041] Brake pipe 201 is used to transmit the hydraulic pressure generated by ABS modulator 202 to rear brake caliper 203 of rear wheel 112. The braking system of straddle-type vehicle 100 adopts an anti-lock brake system (hereinafter referred to as "ABS"). In this embodiment, ABS modulator 202 supplies hydraulic pressure to rear brake caliper 203 based on the transmitted hydraulic pressure and the driving state of the vehicle, thereby controlling the braking of rear wheel 112.

[0042] Combine Figures 2 to 4 As shown, a tube fixing portion 108b is provided on the surface of the cylindrical portion 108a. The brake piping 201 includes a free pipe section 201a and a fixed pipe section 201b, which are connected. The free pipe section 201a extends from the ABS modulator 202 toward the pivot 101b and is fixed to the tube fixing portion 108b. This fully utilizes the space above and behind the pivot 101b for piping, making the overall vehicle layout more compact. Furthermore, the free pipe section 201a is positioned as close as possible to the pivot 101b, which limits its range of motion and reduces contact friction or interference with other components. This eliminates the need for numerous stoppers to prevent unwanted contact and interference, thereby reducing the number of stoppers and improving the vehicle's aesthetics.

[0043] In this embodiment, the fixed pipe section 201b is fixed to the swing arm 108. The fixed pipe section 201b extends in a curved manner from the cylindrical portion 108a to the upper surface of the swing arm 108, and is connected to the rear brake caliper 203 from above the swing arm 108. This ensures that the fixed pipe section 201b is relatively fixed to the swing arm 108, and prevents contact wear between the fixed pipe section 201b and the swing arm 108 due to rotation of the swing arm 108 about the pivot 101b. Therefore, the brake piping structure of the straddle-type vehicle 100 of the present invention can reduce contact friction and interference between the brake pipe 201 and other components, and reduce the use of restrictive components, thereby improving the vehicle's aesthetic appearance.

[0044] In order to facilitate understanding of the superiority of the brake piping structure of the present invention in achieving the above-mentioned effects, a brake piping structure in the related art is used as a reference for explanation below.

[0045] For example, Figure 5In a related art brake piping structure shown, one end of brake piping 201 is fixed to a component that does not move relative to vehicle frame 101 (the vehicle frame 101 itself or a component fixedly assembled thereto), and the other end is fixed to swing arm 108, which is used to swing rear wheel 112. As swing arm 108 rotates about pivot 101b, brake piping 201 moves more widely due to its greater distance from pivot 101b. During this movement, brake piping 201 may come into contact with swing arm 108, causing wear, and may also interfere with surrounding components of swing arm 108. To prevent contact and interference, numerous stoppers are required to limit the position of brake piping 201, which restricts the layout of brake piping 201.

[0046] In the present invention, the cylindrical portion 108a of the swing arm 108 is provided with a pipe fixing portion 108b, and the free pipe section 201a and the fixed pipe section 201b of the brake pipe 201 are both connected to the pipe fixing portion 108b. Figure 6 and Figure 7 As shown, even if the swing arm 108 rotates around the pivot 101b, the movement amplitude of the free tube segment 201a and the fixed tube segment 201b near the pivot 101b is small. To be precise, when the swing arm 108 rotates around the pivot 101b in the first direction to the first extreme position in the normal position, and rotates in the second direction (opposite to the first direction) to the second extreme position, the movement amplitude generated by the free tube segment 201a is small enough to be negligible. Therefore, this small-amplitude movement of the free tube segment 201a is not prone to contact and wear with the swing arm 108, and there is no need to arrange a large number of limiting components, thereby achieving the effect of optimizing the overall appearance.

[0047] In some embodiments, the tube fixing portion 108b is located approximately in the middle of the cylindrical portion 108a. In other words, the tube fixing portion 108b can be located in the center of the cylindrical portion 108a or near the center of the cylindrical portion 108a, as long as the tube fixing portion 108b is located approximately in the center of the cylindrical portion 108a. In this manner, the ABS modulator 202 is positioned on the vehicle frame 101 in the center of the cylindrical portion 108a to maintain the weight balance of the frame 101 in the vehicle width direction. With this structural arrangement, the free section 201a of the brake piping 201 extending from the ABS modulator 202 can be curved to facilitate connection with the tube fixing portion 108b.

[0048] Combine Figure 8As shown, the outlet directions of the two ends of the free tube section 201a are substantially parallel, giving the free tube section 201a a U-shaped bend. Consequently, when the swing arm 108 rotates about the pivot 101b, the connection between the free tube section 201a and the cylindrical portion 108a rotates slightly. In other words, the portion of the free tube section 201a near the tube fixing portion 108b does not move significantly. Consequently, contact wear and motion interference between the free tube section 201a and the cylindrical portion 108a are significantly reduced, thereby maintaining the stability of the brake pipe 201.

[0049] In some embodiments, when viewed from the front and rear sides of the cylindrical portion 108a, the free tube section 201a is arranged in a sideways U-shape to fully utilize the small space above and behind the pivot 101b.

[0050] It should be noted that in some embodiments, the portion of the free tube section 201a connected to the cylindrical portion 108a extends along the axial direction of the cylindrical portion 108a, or the portion of the free tube section 201a connected to the cylindrical portion 108a extends in a direction that forms a certain angle with the axial direction of the cylindrical portion 108a. For example, the extension direction of the portion of the free tube section 201a connected to the cylindrical portion 108a forms an angle of 10° to 45° with the axial direction of the cylindrical portion 108a. The angle between the two can be 10°, 13°, 20°, 25°, 30°, 35°, 40°, or 45°, which is not limited here.

[0051] See again Figures 2 to 4 As shown, in some embodiments, the brake piping structure includes at least one pipe clamp 204. The fixed pipe section 201b is secured to the swing arm 108 via the at least one pipe clamp 204, thereby enhancing the connection stability between the fixed pipe section 201b and the swing arm 108. The number of pipe clamps 204 can be one, two, or three, and the number of pipe clamps 204 is not limited herein. In some embodiments, a pipe clamp 204 is positioned in the middle of the swing arm 108 to stably secure the fixed pipe section 201b to the swing arm 108. After being secured by the pipe clamp 204, the fixed pipe section 201b is connected to the rear brake caliper 203 from above the swing arm 108. This allows the brake piping 201 to fully utilize the space above the swing arm 108 for installation, resulting in a compact layout of the brake piping 201.

[0052] It should be noted that frame tubes and covers can be provided on both sides of the frame 101 to use the covers to shield the free pipe section 201a of the brake pipe 201 to prevent the free pipe section 201a from being observed from the outside of the motorcycle, thereby improving the overall aesthetics.

[0053] In some embodiments, the oil outlet 202a of the ABS modulator 202 is located at the upper rear portion of the cylindrical portion 108a. One end of the free pipe section 201a is connected to the oil outlet 202a, and the other end is connected to the pipe fixing portion 108b. This arrangement allows the free pipe section 201a of the brake piping 201 to be located substantially above and behind the pivot 101b, occupying less space and being close to the pivot 101b. This prevents the free pipe section 201a from significantly moving due to the swing arm 108 rotating about the pivot 101b. Consequently, the free pipe section 201a is more stable, less susceptible to contact and wear with structural components near the pivot 101b, and reduces the likelihood of motion interference.

[0054] In some embodiments, the free tube segment 201a is a flexible tube, so that the free tube segment 201a can adaptively produce flexible deformation when subjected to force to reduce stress. In this way, as the swing arm 108 rotates around the pivot 101b, the free tube segment 201a can produce flexible deformation to reduce the stress generated with the cylindrical portion 108a, thereby maintaining the smoothness of the movement of the swing arm 108.

[0055] In some embodiments, the free pipe section 201a is a rubber hose. In this way, the free pipe section 201a can be maintained in a certain bending shape without setting a limiting component, thereby compensating for the defect that it is not easy to set a limiting component at the free pipe section 201a.

[0056] In some embodiments, the fixed pipe section 201b is formed by a rubber hose, so that the fixed pipe section 201b is easy to bend. Therefore, when the swing arm 108 swings around the pivot 101b, the fixed pipe section 201b fixed to the swing arm 108 will not generate a load that hinders the movement of the swing arm 108, so that the swing arm 108 can swing smoothly around the pivot 101b.

[0057] like Figure 4 As shown, in some embodiments, the tube fixing portion 108b includes a hook and a tube connector 205. The tube connector 205 is fixed to the cylindrical portion 108a via the hook, and the free tube section 201a and the fixed tube section 201b are connected via the tube connector 205. The hook can conveniently connect the tube connector 205 to the cylindrical portion 108a, making it easier to assemble and disassemble the brake pipe 201 and reducing assembly time.

[0058] In addition, in this embodiment, the free pipe section 201a and the fixed pipe section 201b can be connected together by using the pipe connector 205. On the other hand, the connection between the pipe connector 205 and the pipe fixing portion 108b simultaneously realizes the installation and fixation of the free pipe section 201a and the fixed pipe section 201b. Since the pipe fixing portion 108b is located at the cylindrical portion 108a corresponding to the pivot 101b, during the rotation of the swing arm 108 around the pivot 101b, the free pipe section 201a and the fixed pipe section 201b will not have a large relative displacement relative to the swing arm 108. This is because the closer the object is to the rotation center line of the pivot 101b, the smaller the rotation displacement will be, thereby causing The smaller the relative displacement, the smaller the relative displacement. In this embodiment, since the connection point between the free pipe section 201a and the fixed pipe section 201b (i.e., the pipe connector 205) is connected to the cylindrical portion 108a via a hook, the free pipe section 201a does not move significantly during the rotation of the swing arm 108 about the pivot 101b, and thus does not experience wear or motion interference with the swing arm 108. Furthermore, since the fixed pipe section 201b is fixed to the swing arm 108, there is no relative movement between the fixed pipe section 201b and the swing arm 108. During the rotation of the swing arm 108 about the pivot 101b, the fixed pipe section 201b moves with the swing arm 108, thus also avoiding wear or motion interference. Overall, the brake piping structure of the present invention minimizes wear or interference between the brake piping 201 and other components, such as the swing arm 108.

[0059] It should be noted that the present invention is not limited to the above-described embodiment. For example, the straddle-type vehicle 100 is not limited to a configuration in which the driving source comprises only an internal combustion engine; a configuration in which the driving source also comprises an electric motor is also acceptable. The straddle-type vehicle 100 includes all vehicles in which a rider rides astride the vehicle, including not only two-wheeled motor vehicles (including bicycles with a prime mover and scooters), but also three-wheeled vehicles (including vehicles with two front wheels and one rear wheel, in addition to vehicles with one front wheel and two rear wheels) and four-wheeled vehicles.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A brake piping structure for a straddle-type vehicle, characterized in that: include: a frame connected with a pivot; a swing arm having a cylindrical portion, the cylindrical portion being rotatably sleeved on the pivot shaft so that the swing arm can rotate relative to the frame about the pivot shaft, and a tube fixing portion being provided on a surface of the cylindrical portion; A brake pipe for transmitting the hydraulic pressure generated by the ABS modulator to the rear brake caliper of the rear wheel, the brake pipe including a free pipe section and a fixed pipe section connected to each other, the free pipe section extending from the ABS modulator toward the pivot and fixed to the pipe fixing portion, the fixed pipe section fixed to the swing arm, the fixed pipe section extending in a curved manner from the cylindrical portion to the upper surface of the swing arm, and connected to the rear brake caliper from above the swing arm, the pipe fixing portion being located approximately in the middle of the cylindrical portion, and the pipe outlet directions of both ends of the free pipe section being approximately parallel, so that the free pipe section is bent in a U-shape.

2. The brake piping structure for a straddle-type vehicle according to claim 1, wherein: The portion of the free tube section connected to the cylindrical portion extends along the axial direction of the cylindrical portion.

3. The brake piping structure for a straddle-type vehicle according to claim 1 or 2, wherein: It includes at least one pipe clamp, and the fixed pipe section is fixed to the swing arm through the at least one pipe clamp.

4. The brake piping structure for a straddle-type vehicle according to claim 1, wherein: The free pipe section is a pipe with turbulence.

5. The brake piping structure for a straddle-type vehicle according to claim 1, wherein: The free pipe section is a rubber hose.

6. The brake piping structure for a straddle-type vehicle according to claim 1 or 5, wherein: The fixed pipe section is formed by a rubber hose.

7. The brake piping structure for a straddle-type vehicle according to claim 1, wherein: The oil outlet of the ABS regulator is arranged at the upper rear position of the cylindrical portion, one end of the free pipe section is connected to the oil outlet, and the other end is connected to the pipe fixing portion.

8. The brake piping structure for a straddle-type vehicle according to claim 1 or 7, wherein: The tube fixing portion includes a hook and a tube connector. The tube connector is fixed to the cylindrical portion via the hook, and the free tube segment and the fixed tube segment are connected via the tube connector.

9. The brake piping structure for a straddle-type vehicle according to claim 1, wherein: The extending direction of the portion of the free tube section connected to the cylindrical portion is arranged at an angle of 10° to 45° with the axial direction of the cylindrical portion.

10. A motorcycle, characterized in that: A brake piping structure for a straddle-type vehicle comprising the structure described in any one of claims 1 to 9.

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