Motorcycle frame

Abstract

The utility model discloses a motorcycle frame, including frame riser, main beam pipe, two riser down bracing pipe, two main beam down bracing pipe and two frame tail pipe, main beam pipe front end is connected with frame riser rear top fixedly, and middle part is inclined to rear lower side and is bent after, and the lower extreme forms the middle riser that sets up rearwardly inclined, two riser down bracing pipe is parallel with middle riser, and upper end is fixedly connected with frame riser rear lower side, two main beam down bracing pipe is horizontally set up, and front end is fixedly connected with corresponding side riser down bracing pipe middle part, and rear end is fixedly connected with middle riser upper end after bending to inboard side, there is a cross pipe in two riser down bracing pipe lower end connection, and two fixed lugs for being used for connecting with engine front lower side fixedly are arranged on the cross pipe with interval, there is an engine suspension seat in middle riser lower end fixed connection, and two connecting through -holes for being used for connecting with engine rear lower side fixedly are arranged on the left and right sides of engine suspension seat.

Description

Technical Field

[0001] This utility model relates to the field of motorcycles, specifically to a motorcycle frame. Background Technology

[0002] The motorcycle frame is the main load-bearing component of a motorcycle, and the motorcycle engine is the primary load-bearing component on the frame. The motorcycle engine is suspended at the front of the motorcycle frame and is connected to the frame through multiple fixed points. For example, Chinese Patent No. 101708752 discloses a motorcycle frame including a frame top tube, a frame main beam tube, an engine diagonal support tube, a frame center tube, a frame top tube, a frame front support tube, and a frame rear support tube. The front end of the frame main beam tube is connected to the frame top tube, and the rear end of the frame main beam tube is connected to both the frame center tube and the frame front support tube. The rear end of the frame center tube is connected to the frame top tube, and the frame front support tube and the frame rear support tube are connected at the lower end. The frame center tube, frame front support tube, and frame rear support tube, when connected, form an inverted triangular structure when viewed from the side. The frame rear support tube and the frame top tube are integrally formed parts. Upper and lower support tubes for auxiliary foot rests are welded to the lower part of the frame front support tube and the frame rear support tube. The aforementioned chassis uses a single main frame beam and engine strut tube, resulting in an overall structurally unstable design. This makes it insufficient for the robust installation of larger engines. Furthermore, to ensure compact assembly of components, existing chassis are designed to mount specific engines, limiting the available space for the engine. When the model needs to be modified to accommodate other engines, space constraints often necessitate a redesign of the chassis structure to ensure strength and rigidity suitable for the new engine model. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a motorcycle frame that solves the problems of insufficient frame strength and limited engine installation space in the existing technology, which can only be adapted to the installation of one type of engine.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A motorcycle frame includes a frame top tube, a main beam tube, a top tube support tube, a main beam support tube, and a frame tail tube. Each of the top tube support tubes, main beam support tubes, and frame tail tubes has two tubes, arranged symmetrically from left to right. The front end of the main beam tube is fixedly connected to the upper rear of the frame top tube, and its middle section is inclined downwards and backwards, forming a middle top tube with its lower end inclined backwards. The two top tube support tubes are parallel to the middle top tube, and their upper ends are fixedly connected to the lower rear of the frame top tube. The two main beam support tubes are horizontally arranged, with their front ends fixedly connected to the middle of the corresponding side top tube support tube, and their rear ends bent inwards, forming a middle top tube with its lower end inclined backwards. The upper end of the central riser is fixedly connected; a horizontal tube is connected to the lower end of the two riser support tubes, and two fixing lugs for fixing to the lower front of the engine are provided on the horizontal tube at intervals. An engine suspension seat is fixedly connected to the lower end of the central riser, and two connecting through holes for fixing to the lower rear of the engine are provided on both sides of the engine suspension seat; the semi-enclosed space formed from the starting point of the bend in the middle of the main beam tube to the lower end of the two riser support tubes and the lower end of the engine suspension seat is the suspension space of the vertical engine, and the vertical distance between the upper and lower ends of the suspension space is between 445-455mm. In this way, there are two riser support tubes, two main beam support tubes, and two frame tail tubes. After the middle of the main beam tube is bent downward, the rear end forms the central riser tube, so that the central riser tube and the main beam tube are integrally formed, and the overall structure is more stable. The engine mounting points are designed with multiple locations, including two fixed lugs mounted under the riser tubes and four connecting holes on the engine suspension mount. This means there are two connection points between the engine and the frame, with each side arranged in a triangular pattern, ensuring a stable mounting structure. Furthermore, the engine has ample suspension space. The lower end is positioned between the lower ends of the two riser tubes and the engine suspension mount, while the upper cylinder head is positioned between the upper ends of the two riser tubes and the main beam tube, extending even above the main beam tube (i.e., below the starting point of the main beam tube bend). This vertical distance of engine suspension space ranges from 445-155mm, accommodating the mounting height of most vertical engines. Therefore, during vehicle modifications, the frame does not need to be replaced, and the modified engine can be installed to meet the new requirements, effectively saving modification costs.

[0005] Furthermore, the maximum spacing between the lower support tubes of the two main beams is between 230-240mm. This spacing is moderate, allowing the engine cylinder head to pass through and providing protection for the engine.

[0006] Furthermore, two fuel tank mounting lugs are provided on the main beam tube near the frame riser tube, respectively welded and fixed to the left and right sides of the main beam tube. This allows for the installation of the fuel tank above the engine, facilitating fuel supply to the engine. The fuel tank is placed on top of the engine and secured by the two fuel tank mounting lugs, resulting in a compact installation.

[0007] Furthermore, a reinforcing guard plate is fixedly connected to the upper end of each of the two riser support pipes. The reinforcing guard plate is in the shape of an inverted V. A reinforcing plate is also fixedly connected to the connection between the two main beam support pipes and the two riser support pipes. In this way, the reinforcing guard plate and the reinforcing plate can increase the strength of the riser support pipes and the connection strength at the connection between the riser support pipes and the main beam support pipes.

[0008] Furthermore, the main beam tube, main beam under-support tube, and riser under-support tube are all made of Q195 straight seam welded steel pipe, with the main beam tube having a larger diameter and wall thickness than the riser under-support tube and the main beam under-support tube. This results in the Q195 straight seam welded steel pipe having a yield strength of approximately 195 MPa, moderate strength, and excellent welding performance, meeting the load-bearing requirements of the vehicle frame. Simultaneously, the larger wall thickness and diameter of the main beam tube effectively ensure its strength, providing suspension support for the engine.

[0009] Furthermore, two rear frame support tubes with their ends positioned on either side of the engine suspension mount are welded and fixed to the rear ends of the two frame tail tubes. A connecting horizontal tube, with both ends penetrating the side plates and welded and fixed to the corresponding rear frame support tube, is located in the middle of the engine suspension mount. Reinforcing bars are also connected and fixed between the two frame rear support tubes and their corresponding rear frame tail tubes. In this way, the frame rear support tubes, the center tube, and the two frame tail tubes form a triangular support, resulting in a stable overall structure. The reinforcing bars further enhance the support for the frame tail tubes.

[0010] Furthermore, a battery mounting plate is provided on one side of the central riser tube, and a battery mounting lug is provided on the rear support tube of the frame on the same side as the battery mounting plate. The battery mounting plate is U-shaped and includes an outer riser plate and riser tube connecting plates connected to both sides of the outer riser plate. Two mounting holes are provided on the outer riser plate at intervals, arranged vertically. In this way, the battery mounting plate and the battery mounting lug can be used to install a battery to supply power to components such as the oil pump.

[0011] Furthermore, two rack mounting brackets are installed at intervals above the rear end of each frame tail tube, with corresponding rack mounting brackets on both sides. This provides four rack mounting positions at the rear end of the frame tail tube, ensuring stable support for the racks.

[0012] Furthermore, a rack support plate is installed between the two rear support tubes of the frame. The rear side of the rack support plate is bent downward to form a bent upright plate. Two mudguard mounting holes are spaced apart on the bent upright plate, and a mudguard mounting buckle is provided in the middle of each of the two rear support tubes of the frame. In this way, the mudguards on both sides are installed through the mudguard mounting holes and mudguard mounting buckles on the same side, making mudguard installation convenient.

[0013] Furthermore, a footrest mounting plate is installed in the middle of the rear support tubes of both frames, below the rear support tubes. This secondary footrest mounting plate can be used to install motorcycle secondary feet without interfering with other mounting components. Attached Figure Description

[0014] Figure 1 This is a rear axle side view of the motorcycle frame in the embodiment; Figure 2 This is a front axle side view of the motorcycle frame in the embodiment; Figure 3 This is a side view of the motorcycle frame in the embodiment. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0016] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] Existing motorcycle frames, in order to ensure their compact structure, have limited space for engine mounting, accommodating only one type of engine. If an engine needs to be replaced during modification, the frame must be redesigned, resulting in waste. Therefore, this embodiment improves the existing motorcycle frame, making it compact while still providing sufficient engine mounting space to accommodate different engine models.

[0018] like Figures 1-3As shown, the motorcycle frame provided in this embodiment includes a frame riser tube 1, a main beam tube 3, a riser lower support tube 2, a main beam lower support tube 4, and a frame tail tube 6. Each of the riser lower support tubes 2, main beam lower support tubes 4, and frame tail tubes 6 has two tubes, arranged symmetrically from left to right. The front end of the main beam tube 3 is fixedly connected to the upper rear of the frame riser tube 1, and its middle section is inclined downwards and backwards, forming a middle riser tube 31 with its lower end inclined backwards. The two riser lower support tubes 2 are parallel to the middle riser tube 31, and their upper ends are fixedly connected to the lower rear of the frame riser tube 1 (both the upper and lower ends of the riser lower support tube 2 are bent inwards towards the frame, arranged at an angle, and a reinforcing rib or reinforcing cross tube is connected between the two riser lower support tubes 2). The two main beam lower support tubes 4 are arranged horizontally, with their front ends connected to the middle of the corresponding side riser lower support tube 2. The main beam tube 3 is fixedly connected to the lower end of the central upright tube 31 after being bent inward at the rear end. A horizontal tube is connected to the lower end of the two upright tubes 2. Two fixed lugs for fixing to the lower front of the engine are provided on the horizontal tube at intervals. An engine suspension seat 5 (including a top plate, a left side plate, a right side plate and a back plate connected to the left side plate and the right side plate) is fixedly connected to the lower end of the central upright tube 31. Two connecting through holes 51 for fixing to the lower rear of the engine are provided on both the left and right sides of the engine suspension seat 5. The semi-enclosed space formed from the starting point of the bend in the middle of the main beam tube 3 to the lower end of the two upright tubes 2 and the lower end of the engine suspension seat 5 is the suspension space of the vertical engine. The vertical distance between the upper and lower ends of the suspension space is between 445-455mm. In this way, two riser support tubes 2, two main beam support tubes 4, and two frame tail tubes 6 are provided. Furthermore, the main beam tube 3 is bent downwards in the middle, forming a central riser tube 31 at the rear end, making the central riser tube 31 and the main beam tube 3 integrally formed, resulting in a more stable overall structure. Multiple engine mounting points are provided, including two fixed lugs installed under the riser support tube 2 and four connecting through holes 51 on the engine suspension mount 5. This means there are two connection points between the engine and the frame, with each side's connection points arranged in a triangular pattern, ensuring a stable fixing structure. In addition, the engine has ample suspension space. The lower end is located between the lower end of the two riser tubes 2 and the engine suspension seat 5, while the upper end of the cylinder head is located between the upper end of the two riser tubes 2 and the main beam tube 3. It can also extend above the main beam tube 4 (i.e. below the starting position of the bend of the main beam tube 3). The vertical distance of this engine suspension space is between 445-155mm, which can accommodate the installation height of most vertical engines. Therefore, when the vehicle is modified, there is no need to replace the frame, and it can also accommodate the installation needs of the modified engine, which can effectively save modification costs.

[0019] Furthermore, the maximum distance between the two main beam lower support tubes 4 is between 230-240mm. This appropriate distance allows the engine cylinder head to pass through, thus protecting the engine.

[0020] Furthermore, two fuel tank mounting lugs 33 are provided on the main beam tube 3 near the frame riser tube 1, and are welded and fixed to the left and right sides of the main beam tube 3 respectively. This allows for the installation of a fuel tank above the engine, facilitating fuel supply to the engine. The fuel tank is placed on the engine and secured by the two fuel tank mounting lugs 33, resulting in a compact installation.

[0021] Furthermore, a reinforcing guard plate is fixedly connected to the upper end of each of the two vertical support pipes 2, and the reinforcing guard plate is in the shape of an inverted V; a reinforcing plate is also fixedly connected to the connection between the two main beam support pipes 4 and the two vertical support pipes 2. In this way, the reinforcing guard plate and the reinforcing plate can increase the strength of the vertical support pipe 2 and the connection strength at the connection between the vertical support pipe 2 and the main beam support pipe 4 to a certain extent.

[0022] Furthermore, the main beam tube 3 is made of Q195 48x3.0 straight seam welded steel pipe, while the two vertical support tubes 2 and the main beam support tube 4 are made of Q195 25x1.5 straight seam welded steel pipe. Thus, the yield strength of the Q195 straight seam welded steel pipe is approximately 195 MPa, which is moderate in strength and has excellent welding performance, meeting the load-bearing requirements of the frame. At the same time, the main beam tube 3 has a relatively large wall thickness and diameter, effectively ensuring its strength and providing suspension support for the engine.

[0023] Furthermore, two frame rear support tubes 7, with their ends positioned on either side of the engine suspension mount 5, are welded and fixed to the rear ends of the two frame tail tubes 6. A connecting horizontal tube 8, with both ends penetrating the side plates of the engine suspension mount 5 and welded and fixed to the corresponding frame rear support tube 7, is located in the middle of the engine suspension mount 5 (the lower end of the central riser tube 31 penetrates the top plate of the engine suspension mount 5 and is welded and fixed to the connecting horizontal tube 8). Reinforcing rods are also connected and fixed between the two frame rear support tubes 7 and their corresponding frame tail tubes 6. In this way, the frame rear support tubes 7, the central riser tube 31, and the two frame tail tubes 6 form a triangular support, resulting in a stable overall structure. The reinforcing rods further enhance the support for the frame tail tubes 6.

[0024] Furthermore, a battery mounting plate 32 is provided on one side of the central riser tube 31, and a battery mounting lug 72 is provided on the rear support tube 7 of the frame on the same side as the battery mounting plate 32. The battery mounting plate 32 is U-shaped and includes an outer riser plate and riser tube connecting plates connected to both sides of the outer riser plate. Two mounting holes are provided on the outer riser plate at intervals and distributed vertically. In this way, the battery mounting plate 32 and the battery mounting lug 72 can be used to install a battery to supply power to components such as the oil pump.

[0025] Furthermore, two rack mounting pieces 61 are installed at intervals above the rear end of each frame tail tube 6, with the rack mounting pieces 61 on both sides corresponding one-to-one. In this way, there are four rack mounting positions at the rear end of the frame tail tube 6 for installing racks and providing stable support for the racks.

[0026] Furthermore, a rack support plate 9 is installed between the two rear support tubes 6 of the frame. The rear side of the rack support plate 9 is bent downward to form a bent upright plate. Two mudguard mounting holes 91 are spaced apart on the bent upright plate, and a mudguard mounting buckle 71 is provided in the middle of each of the two rear support tubes 7 of the frame. In this way, the mudguards on the left and right sides are installed through the mudguard mounting holes 91 and mudguard mounting buckles 71 on the same side, making mudguard installation convenient.

[0027] Furthermore, a footrest mounting plate 73 is provided in the middle of the rear support tube 7 of both frames and below the rear support tube 7. Thus, the provided footrest mounting plate 73 can be used to install motorcycle auxiliary feet, and it does not interfere with other mounting components. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit the technical solution. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solution of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A motorcycle frame, comprising a frame top tube, a main beam tube, a bottom support tube for the top tube, a bottom support tube for the main beam, and a frame tail tube, characterized in that, Each of the riser lower support tubes, main beam lower support tubes, and frame tail tubes has two tubes, arranged symmetrically from left to right. The front end of the main beam tube is fixedly connected to the upper rear of the frame riser tube, and the middle part is inclined downwards and backwards, forming a middle riser tube with the lower end inclined backwards. The two riser lower support tubes are parallel to the middle riser tube, and their upper ends are fixedly connected to the lower rear of the frame riser tube. The two main beam lower support tubes are horizontally arranged, with their front ends fixedly connected to the middle of the corresponding side riser lower support tube, and their rear ends bent inwards and fixedly connected to the upper end of the middle riser tube. Below the two riser lower support tubes... A horizontal tube is connected to the end, and two fixing lugs are provided at intervals on the horizontal tube for fixing to the lower front of the engine. An engine suspension seat is fixedly connected to the lower end of the middle upright tube. Two connecting through holes are provided on the left and right sides of the engine suspension seat for fixing to the lower rear of the engine. The semi-enclosed space formed from the starting point of the bend in the middle of the main beam tube to the lower end of the two upright tubes and the lower end of the engine suspension seat is the suspension space of the vertical engine. The vertical distance between the upper and lower ends of the suspension space is between 445-455mm.

2. The motorcycle frame according to claim 1, characterized in that, The maximum spacing between the under-bracing pipes of the two main beams is between 230-240mm.

3. The motorcycle frame according to claim 1 or 2, characterized in that, Two fuel tank mounting lugs are provided near the frame riser tube on the main beam tube, and are welded and fixed to the left and right sides of the main beam tube respectively.

4. The motorcycle frame according to claim 3, characterized in that, A reinforcing guard plate is fixedly connected to the upper end of the two vertical support pipes. The reinforcing guard plate is in the shape of an inverted V. A reinforcing plate is also fixedly connected to the connection between the two main beam support pipes and the two vertical support pipes.

5. The motorcycle frame according to claim 1, 2, or 4, characterized in that, The main beam pipe, the main beam under-support pipe, and the riser under-support pipe are all made of Q195 straight seam electric welded steel pipe, wherein the diameter and wall thickness of the main beam pipe are greater than those of the riser under-support pipe and the main beam under-support pipe.

6. The motorcycle frame according to claim 5, characterized in that, Two frame rear support tubes with their ends placed on both sides of the engine suspension mount are welded and fixed to the rear end of the two frame tail tubes. A connecting horizontal tube with its two ends passing through the side plates and welded and fixed to the corresponding frame rear support tube is provided in the middle of the engine suspension mount. A reinforcing rod is also connected and fixed between the two frame rear support tubes and the frame tail tubes on their corresponding sides.

7. The motorcycle frame according to claim 6, characterized in that, A battery mounting plate is provided on one side of the central riser tube, and a battery mounting lug is provided on the rear support tube of the frame on the same side as the battery mounting plate; the battery mounting plate is U-shaped and includes an outer riser plate and riser tube connecting plates connected to both sides of the outer riser plate, and two mounting holes are provided on the outer riser plate at intervals and distributed vertically.

8. The motorcycle frame according to claim 6 or 7, characterized in that, Two rack mounting brackets are installed at intervals above the rear end of each frame tail tube, with the rack mounting brackets on both sides corresponding to each other.

9. The motorcycle frame according to claim 8, characterized in that, A rack support plate is also installed between the two rear tubes of the frame. The rear side of the rack support plate is bent downward to form a bent upright plate. Two mudguard mounting holes are provided at intervals on the bent upright plate. A mudguard mounting buckle is provided in the middle of the rear support tubes of the two frames.

10. The motorcycle frame according to claim 8, characterized in that, A footrest mounting plate is also installed in the middle of the rear support tubes of the two frames and below the rear support tubes of the frames.

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