A motorcycle frame

Abstract

The present application relates to the field of motorcycle technology, and particularly relates to a motorcycle frame, comprising a front frame body, a rear frame body and an axle distance adjusting mechanism, wherein the frame is designed as a split structure of the front frame body and the rear frame body, and three synchronous driving units are arranged, respectively, inside a main beam at the upper part and inside two slide pipes at the lower part, to form an upper and lower double-plane three-point guiding system. When the axle distance is adjusted, the three synchronous driving units synchronously drive the slide beams to slide in the front and rear directions relative to the main beam, and the two slide rods are synchronously driven to slide in the front and rear directions relative to the corresponding slide pipes, so that the rear frame body as a whole is translated relative to the front frame body, thereby accurately changing the axle distance length. The structure enables the rider to flexibly adjust the axle distance according to different terrains, significantly improves the multi-scene adaptability of the off-road motorcycle, and solves the technical problem of fixed axle distance of the traditional integrated frame.

Description

Technical Field

[0001] This invention relates to the field of motorcycle technology, and more particularly to a motorcycle frame. Background Technology

[0002] As a type of motor vehicle used for riding and racing on unpaved roads, the frame structure of a motocross motorcycle directly affects the vehicle's handling, passability, and riding stability. As the core load-bearing component of the motorcycle, the frame must simultaneously withstand impact loads from the road surface, engine vibrations, and the rider's weight, thus placing high demands on the frame's strength, rigidity, and structural rationality.

[0003] Currently, existing off-road motorcycle frames typically employ a one-piece welded or integral cast structure, mainly comprising the front seat tube, main beam, subframe, and rear bracket. The front seat tube mounts the front fork steering column, the main beam extends from the front seat tube downwards and rearwards to form the main frame body, the subframe connects to the rear of the main beam to support the engine and rear wheel swingarm, and the rear bracket mounts the seat and rear fender. This type of one-piece frame structure is simple, has low manufacturing costs, and can meet the needs of regular off-road riding. However, in actual use, existing off-road motorcycle frames have a fixed wheelbase, which cannot be adjusted according to different riding scenarios, severely limiting the multi-scenario adaptability of off-road motorcycles. Summary of the Invention

[0004] The purpose of this invention is to provide a motorcycle frame that solves the problem that existing off-road motorcycle frames, due to their fixed wheelbase, cannot be adjusted according to different riding scenarios, severely limiting the multi-scenario adaptability of off-road motorcycles.

[0005] To achieve the above objectives, the present invention provides a motorcycle frame, which includes a front frame, a rear frame, and a wheelbase adjustment mechanism. A front stem mounting seat is provided at the front end of the front frame, a main beam is fixedly provided at the upper part of the rear end of the front frame, and two slide tubes are fixedly provided on both sides of the lower part of the rear end of the front frame. A sliding beam is fixedly installed on the upper part of the front end of the rear frame. The sliding beam is slidably fitted and installed inside the main beam. Both the sliding beam and the main beam are hollow tubes. Two sliding rods are fixedly installed on both sides of the lower part of the front end of the rear frame. Each sliding rod is slidably inserted into the corresponding slide tube. Both the sliding rod and the slide tube are hollow tubes. The wheelbase adjustment mechanism consists of three synchronous drive units. The synchronous drive units are installed inside the main beam and the two slide tubes. The synchronous drive units are used to drive the sliding beam to slide synchronously relative to the main beam and the sliding rod to slide synchronously relative to the slide tube, so as to change the axial distance between the front frame and the rear frame, and lock them after adjustment.

[0006] Each of the synchronous drive units includes a lead screw and a nut block. The lead screw is rotatably disposed inside the corresponding main beam or the slide tube in the front-back direction. The nut block is fixedly disposed on the corresponding sliding beam or sliding rod. The nut block is threadedly engaged with the lead screw. Each lead screw also has a drive component at one end facing the front frame. The drive component is used to receive external driving force to drive the lead screw to rotate.

[0007] The wheelbase adjustment mechanism further includes a power unit. A drive seat is installed between the main beam and the two slide tubes via a hollow connecting arm. The power unit is installed at the drive seat, and all three drive components are mechanically transmitted to the output end of the power unit.

[0008] The power unit includes a drive motor, three drive sprockets and three transmission chains. The three drive sprockets are coaxially arranged at the output end of the drive motor and rotate synchronously. Each of the drive components includes a drive sprocket and a universal joint. The drive sprocket is connected to the end of the corresponding lead screw facing the front frame via the universal joint. Each drive sprocket is connected to the corresponding drive sprocket via the corresponding drive chain. The drive motor transmits power to each of the lead screws through the drive sprocket, the transmission chain, and the transmission sprocket.

[0009] The drive motor is mounted outside the drive base, and a protective shell is also provided outside the drive base. The protective shell is located outside the drive motor and has heat dissipation grooves.

[0010] Each of the lead screws is mounted inside the corresponding main beam and the sliding tube via a mounting bearing seat.

[0011] The motorcycle frame also includes a rake angle adjustment assembly. A front seat tube is rotatably mounted on the front seat tube mounting base via a pivot. A front fork steering column is located inside the front seat tube. The rake angle adjustment assembly is mounted on the outer side of the front seat tube mounting base. The rake angle adjustment assembly is used to drive the front seat tube to swing around the pivot to adjust the tilt angle of the front fork steering column relative to the horizontal plane.

[0012] The forward tilting component includes a locking element and an operating handwheel. A mounting protrusion is fixedly provided on one side of the front riser mounting base. The operating handwheel is fixedly connected to the rotating shaft and is located on the side of the front riser mounting base where the mounting protrusion is provided. Multiple locking holes are provided on the outer side wall of the operating handwheel. The locking element is provided on the mounting protrusion and is adapted to the locking holes.

[0013] The locking component includes a locking screw, a rotating part, and a locking head. The locking screw is threadedly connected to the mounting protrusion. The rotating part is fixedly provided at one end of the locking screw, and the locking head is fixedly provided at the other end of the locking screw. The locking head is adapted to the locking hole.

[0014] This invention discloses a motorcycle frame comprising a front frame, a rear frame, and a wheelbase adjustment mechanism. The frame is designed as a split structure for the front and rear frames, with three synchronous drive units respectively arranged inside the upper main beam and two lower sliding tubes on either side, forming an upper and lower dual-plane three-point guide system. During wheelbase adjustment, the three synchronous drive units synchronously drive the sliding beam relative to the main beam and the two sliding rods relative to their corresponding sliding tubes to slide synchronously in the front-rear direction, causing the rear frame to translate relative to the front frame, thereby precisely changing the wheelbase length. This structure allows the rider to flexibly adjust the wheelbase according to different terrains (e.g., extending the wheelbase on highways to improve straight-line stability, and shortening the wheelbase on technical curves to enhance steering agility), significantly improving the multi-scenario adaptability of off-road motorcycles and solving the technical problem of fixed wheelbase in traditional one-piece frames. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the motorcycle frame provided by the present invention.

[0017] Figure 2 This invention provides Figure 1 A magnified view of the local structure at point A.

[0018] Figure 3 This invention provides Figure 1 A magnified view of the local structure at point B.

[0019] Figure 4This is a partial structural schematic diagram of the wheelbase adjustment mechanism provided by the present invention.

[0020] Figure 5 This invention provides Figure 4 A magnified view of the local structure at point C.

[0021] 101-Front frame, 102-Rear frame, 103-Front riser mounting base, 104-Main beam, 105-Slide rail, 106-Sliding beam, 107-Sliding rod, 108-Screw rod, 109-Nut block, 110-Hollow connecting arm, 111-Drive seat, 112-Drive motor, 113-Drive sprocket, 114-Drive chain, 115-Drive sprocket, 116-Universal joint, 117-Protective shell, 118-Heat sink, 119-Mounting bearing seat, 120-Shaft, 121-Front riser, 122-Front fork steering column, 123-Operating handwheel, 124-Mounting protrusion, 125-Locking hole, 126-Locking screw, 127-Rotating part, 128-Locking head. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] Please see Figures 1 to 5 The present invention provides a motorcycle frame, the motorcycle frame including a front frame 101, a rear frame 102 and a wheelbase adjustment mechanism. The front frame 101 is provided with a front stem mounting seat 103 at the front end, a main beam 104 is fixedly provided at the upper part of the rear end of the front frame 101, and two slide tubes 105 are fixedly provided on both sides of the lower part of the rear end of the front frame 101. A sliding beam 106 is fixedly installed on the upper part of the front end of the rear frame 102. The sliding beam 106 is slidably fitted and installed inside the main beam 104. Both the sliding beam 106 and the main beam 104 are hollow tubes. Two sliding rods 107 are fixedly installed on both sides of the lower part of the front end of the rear frame 102. Each sliding rod 107 is slidably inserted into the corresponding slide tube 105. Both the sliding rod 107 and the slide tube 105 are hollow tubes. The wheelbase adjustment mechanism consists of three synchronous drive units. The synchronous drive units are installed inside the main beam 104 and the two slide tubes 105. The synchronous drive units are used to drive the sliding beam 106 relative to the main beam 104 and the sliding rod 107 relative to the slide tube 105 to slide synchronously, so as to change the axial distance between the front frame 101 and the rear frame 102, and lock them after adjustment.

[0024] In this embodiment, the frame is designed as a split structure of the front frame 101 and the rear frame 102, and three synchronous drive units are respectively arranged inside the upper main beam 104 and the two lower sliding tubes 105 on both sides, forming an upper and lower dual-plane three-point guide system. During wheelbase adjustment, the three synchronous drive units synchronously drive the sliding beam 106 relative to the main beam 104 and the two sliding rods 107 relative to their corresponding sliding tubes 105 to slide synchronously in the front-rear direction, causing the rear frame 102 to translate relative to the front frame 101, thereby precisely changing the wheelbase length. This structure allows the rider to flexibly adjust the wheelbase according to different terrains (e.g., extending the wheelbase on highways to improve straight-line stability, and shortening the wheelbase on technical curves to enhance steering agility), significantly improving the multi-scenario adaptability of off-road motorcycles and solving the technical problem of fixed wheelbase in traditional one-piece frames.

[0025] Furthermore, each of the synchronous drive units includes a lead screw 108 and a nut block 109. The lead screw 108 is rotatably disposed inside the corresponding main beam 104 or the slide tube 105 in the front-back direction. The nut block 109 is fixedly disposed on the corresponding sliding beam 106 or the sliding rod 107. The nut block 109 is threadedly engaged with the lead screw 108. Each lead screw 108 is also provided with a drive member at one end facing the front frame 101. The drive member is used to receive external driving force to drive the lead screw 108 to rotate.

[0026] In this embodiment, the lead screw 108 and the nut block 109 form a lead screw and nut transmission pair. When an external driving force drives the lead screw 108 to rotate through the driving member, the nut block 109 moves along the axial direction of the lead screw 108, thereby driving the sliding beam 106 or the sliding rod 107 fixedly connected to it to slide in the front-back direction.

[0027] In this design, the thread helix angle of the lead screw 108 is smaller than the equivalent friction angle between it and the nut block 109, thus forming a self-locking threaded pair between the lead screw 108 and the nut block 109. This self-locking threaded pair structure maintains wheelbase stability without the need for an additional locking device, preventing unexpected wheelbase changes due to vehicle vibration or impact after adjustment, and also simplifies the frame structure. Furthermore, the wheelbase adjustment mechanism also includes a power unit. A drive seat 111 is installed between the main beam 104 and the two slide tubes 105 via a hollow connecting arm 110. The power unit is installed at the drive seat 111, and all three drive components are mechanically transmitted to the output end of the power unit.

[0028] In this embodiment, the hollow connecting arm 110 is fixedly connected to the front frame 101, and its interior forms a hollow cavity for the transmission components to pass through. The drive seat 111 is fixedly installed between the three hollow connecting arms 110, and the output end of the power unit is simultaneously mechanically connected to the three drive components, thereby synchronously distributing the driving force output from a single power source to the three synchronous drive units, ensuring that the three lead screws 108 rotate synchronously at the same speed and in the same direction.

[0029] Furthermore, the power unit includes a drive motor 112, three drive sprockets 113 and three transmission chains 114. The three drive sprockets 113 are coaxially arranged at the output end of the drive motor 112 and rotate synchronously. Each of the drive components includes a drive sprocket 115 and a universal joint 116. The drive sprocket 115 is connected to the end of the corresponding lead screw 108 facing the front frame 101 through the universal joint 116. Each drive sprocket 115 is connected to the corresponding drive sprocket 113 through the corresponding drive chain 114. The drive motor 112 transmits power to each of the lead screws 108 through the drive sprocket 113, the transmission chain 114, and the transmission sprocket 115.

[0030] In this embodiment, after the drive motor 112 starts, its output end drives the three coaxially arranged drive sprockets 113 to rotate synchronously. Each drive sprocket 113 transmits power to its corresponding drive sprocket 115 through the corresponding transmission chain 114. Each drive sprocket 115 drives its corresponding lead screw 108 to rotate through the universal joint 116. While transmitting torque, the universal joint 116 can compensate for angular deviations and axial displacements between the lead screw 108 and the drive sprocket 115 caused by installation errors or frame deformation, ensuring the smoothness and reliability of power transmission.

[0031] Furthermore, the drive motor 112 is mounted outside the drive base 111, and a protective shell 117 is also provided outside the drive base 111. The protective shell 117 is located outside the drive motor 112, and a heat dissipation groove 118 is provided on the protective shell 117.

[0032] In this embodiment, the protective shell 117 covers the outside of the drive motor 112 to prevent external foreign objects such as mud, water, and sand from entering the drive motor 112 during driving, thus protecting the drive motor 112 from damage caused by off-road environments. The heat dissipation grooves 118 on the protective shell 117 facilitate the timely dissipation of heat generated by the drive motor 112 during operation, preventing overheating and ensuring the reliability and service life of the drive motor 112 under long-term operating conditions.

[0033] Furthermore, each of the lead screws 108 is mounted inside the corresponding main beam 104 and the sliding tube via a mounting bearing seat 119.

[0034] In this embodiment, the mounting bearing seat 119 provides stable rotational support for the lead screw 108, ensuring that the lead screw 108 remains coaxial with the main beam 104 or the slide tube 105 during rotation, preventing the lead screw 108 from jamming with the nut block 109 due to radial runout, and ensuring the smoothness and accuracy of the wheelbase adjustment action.

[0035] Furthermore, the motorcycle frame also includes a rake angle adjustment assembly. A front seat tube 121 is rotatably mounted on the front seat tube mounting base 103 via a pivot 120. A front fork steering column 122 is disposed inside the front seat tube 121. The rake angle adjustment assembly is mounted on the outer side of the front seat tube mounting base 103. The rake angle adjustment assembly is used to drive the front seat tube 121 to swing around the pivot 120 to adjust the tilt angle of the front fork steering column 122 relative to the horizontal plane.

[0036] In this embodiment, the front seat tube 121 is rotatably connected to the front seat tube mounting base 103 via the pivot 120. The front seat tube 121 can reciprocate within a certain angle range around the axis of the pivot 120. When the front seat tube 121 swings around the pivot 120, the front fork steering column 122, which passes through the front seat tube 121, swings synchronously with the front seat tube 121, thereby changing the tilt angle of the front fork steering column 122 relative to the horizontal plane, that is, changing the lean angle of the motorcycle. By adjusting the lean angle, the front wheel trail and steering feel can be changed, allowing the vehicle to obtain optimized handling characteristics in different riding scenarios.

[0037] Furthermore, the tilting angle assembly includes a locking element and an operating handwheel 123. A mounting protrusion 124 is fixedly provided on one side of the front riser mounting base 103. The operating handwheel 123 is fixedly connected to the rotating shaft 120 and is located on the side of the front riser mounting base 103 where the mounting protrusion 124 is provided. Multiple locking holes 125 are provided on the outer side wall of the operating handwheel 123. The locking element is provided on the mounting protrusion 124, and the locking element is adapted to the locking holes 125.

[0038] In this embodiment, the user can rotate the operating handwheel 123 to drive the rotating shaft 120 to rotate, thereby driving the front riser 121 to swing around the rotating shaft 120, thus achieving manual adjustment of the tilt angle. Multiple locking holes 125 are arranged at circumferential intervals along the operating handwheel 123, each corresponding to a different tilt angle adjustment angle. When the operating handwheel 123 is rotated to the target angle, the locking member is inserted into the corresponding locking hole 125, thereby locking the current swing angle of the front riser 121 and preventing the tilt angle from changing due to vibration during vehicle operation.

[0039] Furthermore, the locking component includes a locking screw 126, a rotating part 127, and a locking head 128. The locking screw 126 is threadedly connected to the mounting protrusion 124. One end of the locking screw 126 is fixedly provided with the rotating part 127, and the other end of the locking screw 126 is fixedly provided with the locking head 128. The locking head 128 is adapted to the locking hole 125.

[0040] In this embodiment, when locking is required, the rotating part 127 is rotated to move the locking screw 126 toward the operating handwheel 123 until the locking head 128 is inserted into the corresponding locking hole 125 to achieve locking; when adjusting the tilt angle is required, the rotating part 127 is rotated in the opposite direction to make the locking head 128 retract from the locking hole 125 to release the lock.

[0041] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A motorcycle frame, characterized in that, It includes a front frame, a rear frame, and a wheelbase adjustment mechanism. The front frame is provided with a front upright mounting seat at the front end, a main beam is fixedly provided at the upper part of the rear end of the front frame, and two slide tubes are fixedly provided on both sides of the lower part of the rear end of the front frame. A sliding beam is fixedly installed on the upper part of the front end of the rear frame. The sliding beam is slidably fitted and installed inside the main beam. Both the sliding beam and the main beam are hollow tubes. Two sliding rods are fixedly installed on both sides of the lower part of the front end of the rear frame. Each sliding rod is slidably inserted into the corresponding slide tube. Both the sliding rod and the slide tube are hollow tubes. The wheelbase adjustment mechanism consists of three synchronous drive units. The synchronous drive units are installed inside the main beam and the two slide tubes. The synchronous drive units are used to drive the sliding beam to slide synchronously relative to the main beam and the sliding rod to slide synchronously relative to the slide tube, so as to change the axial distance between the front frame and the rear frame, and lock them after adjustment.

2. The motorcycle frame as described in claim 1, characterized in that, Each of the synchronous drive units includes a lead screw and a nut block. The lead screw is rotatably disposed inside the corresponding main beam or the slide tube in the front-back direction. The nut block is fixedly disposed on the corresponding sliding beam or sliding rod. The nut block is threadedly engaged with the lead screw. Each lead screw also has a drive component at one end facing the front frame. The drive component is used to receive external driving force to drive the lead screw to rotate.

3. The motorcycle frame as described in claim 2, characterized in that, The wheelbase adjustment mechanism also includes a power unit. A drive seat is installed between the main beam and the two slide tubes through a hollow connecting arm. The power unit is installed at the drive seat, and the three drive components are all mechanically transmitted to the output end of the power unit.

4. The motorcycle frame as described in claim 3, characterized in that, The power unit includes a drive motor, three drive sprockets and three transmission chains. The three drive sprockets are coaxially arranged at the output end of the drive motor and rotate synchronously. Each of the drive components includes a drive sprocket and a universal joint. The drive sprocket is connected to the end of the corresponding lead screw facing the front frame via the universal joint. Each drive sprocket is connected to the corresponding drive sprocket via the corresponding drive chain. The drive motor transmits power to each of the lead screws through the drive sprocket, the transmission chain, and the transmission sprocket.

5. The motorcycle frame as described in claim 4, characterized in that, The drive motor is mounted outside the drive base, and a protective shell is also provided outside the drive base. The protective shell is located outside the drive motor and has heat dissipation grooves.

6. The motorcycle frame as described in claim 5, characterized in that, Each of the lead screws is mounted inside the corresponding main beam and the sliding tube via a mounting bearing housing.

7. The motorcycle frame as described in claim 1, characterized in that, The motorcycle frame also includes a rake angle adjustment assembly. A front seat tube is rotatably mounted on the front seat tube mounting base via a pivot. A front fork steering column is disposed inside the front seat tube. The rake angle adjustment assembly is mounted on the outer side of the front seat tube mounting base. The rake angle adjustment assembly is used to drive the front seat tube to swing around the pivot to adjust the tilt angle of the front fork steering column relative to the horizontal plane.

8. The motorcycle frame as described in claim 7, characterized in that, The tilting angle assembly includes a locking element and an operating handwheel. A mounting protrusion is fixedly provided on one side of the front riser mounting base. The operating handwheel is fixedly connected to the rotating shaft and is located on the side of the front riser mounting base where the mounting protrusion is provided. Multiple locking holes are provided on the outer side wall of the operating handwheel. The locking element is provided on the mounting protrusion, and the locking element is adapted to the locking holes.

9. The motorcycle frame as described in claim 8, characterized in that, The locking component includes a locking screw, a rotating part, and a locking head. The locking screw is threadedly connected to the mounting protrusion. The rotating part is fixedly provided at one end of the locking screw, and the locking head is fixedly provided at the other end of the locking screw. The locking head is adapted to the locking hole.

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