Integrally-formed motorcycle frame and preparation method thereof

Abstract

The invention relates to the technical field of motorcycle frames, and discloses an integrally formed motorcycle frame, the front ends of a left frame main body and a right frame main body are symmetrically connected to the two sides of a motorcycle head pipe, a connecting rod is connected between the rear ends of the left frame main body and the right frame main body, and the peripheral edge of each frame main body is provided with an edge reinforcing surrounding edge protruding towards one side of the outer surface of the frame main body; a plurality of reinforcing rib plates are distributed on the outer side face of the frame body, and the motorcycle frame is integrally formed by aluminum alloy materials in a die-casting mode. The invention further discloses a preparation method of the integrally-formed motorcycle frame. The preparation method comprises the steps that molten aluminum in a molten state is injected into a die-casting die; the molten aluminum enters a flow gate of the die-casting die at a low speed, accelerates in the flow gate and enters a cavity at a high speed, and the cavity is filled with the molten aluminum; after the die casting is solidified, the fixed die assembly and the movable die assembly are opened, and then the left sliding block assembly, the right sliding block assembly and the rear sliding block assembly are sequentially opened. The light weight of the motorcycle frame is achieved, meanwhile, the strength and rigidity of the frame can be improved, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motorcycle frames, and in particular to an integrally formed motorcycle frame and a preparation method thereof. Background Art

[0002] Traditional motorcycle frames are usually assembled from multiple parts through welding, bolting, etc. This manufacturing method has many disadvantages. The large number of parts leads to complex production processes and low production efficiency. Assembly errors are prone to occur during the assembly process, affecting the overall accuracy and performance of the frame. The numerous connection points reduce the structural strength and rigidity of the frame. During the driving of the motorcycle, the connections are prone to loosening, deformation or even breakage due to force, affecting driving safety. At the same time, the use of a large number of parts also increases costs. The nuts, bolts and other fasteners used in the assembly process increase the weight of the vehicle, and the product is not lightweight enough. In order to facilitate production and manufacturing, the lower rear side of the frame is an open structure. Due to the lack of a lower connection structure, if the above design is to be compatible with a multi-link rear suspension mechanism, additional parts will still need to be added to realize the function. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrally formed motorcycle frame and a preparation method thereof, so as to achieve lightweighting of the motorcycle frame while improving the strength and rigidity of the frame, simplifying the manufacturing process, reducing production costs and improving production efficiency.

[0004] In order to achieve the above-mentioned objectives, one aspect of the present invention provides an integrally formed motorcycle frame, comprising a head tube, a left frame body, a right frame body and a connecting rod, wherein the front end of the left frame body and the front end of the right frame body are symmetrically connected to both sides of the head tube, and the connecting rod is connected between the rear end of the left frame body and the rear end of the right frame body, the outer peripheral edges of the left frame body and the outer peripheral edges of the right frame body are provided with edge reinforcement edges protruding toward one side of the outer surface thereof, and a plurality of reinforcing ribs are arranged on the outer side surface of the left frame body and the outer side surface of the right frame body, and the motorcycle frame is integrally die-casted from an aluminum alloy material.

[0005] As a preferred solution of the present invention, the left frame body and the right frame body both include a frame front beam plate and a frame rear beam plate, the frame rear beam plate is connected to the rear end of the frame front beam plate and bends downward, an engine fixing portion extends below the middle portion of the frame front beam plate, an engine front mounting point is provided below the engine mounting portion, two sub-frame mounting points are provided on the top surface of the frame rear beam plate, a rear shock absorber mounting point, an engine middle mounting point, a rear fork shaft mounting point and an engine lower mounting point are provided from top to bottom on the front side of the frame rear beam plate, a rear suspension front mounting point and a rear suspension rear mounting point are provided at the bottom of the frame rear beam plate, and the rear suspension front mounting point is located between the engine lower mounting point and the rear suspension rear mounting point.

[0006] As a preferred solution of the present invention, the reinforcing rib is connected to the edge reinforcement surround.

[0007] As a preferred solution of the present invention, two adjacent reinforcing rib plates in the front beam plate of the frame are connected to form a triangular structure.

[0008] As a preferred solution of the present invention, the reinforcing rib plate is provided between the rear shock absorber mounting point and the middle mounting point of the engine, the reinforcing rib plate is provided between the middle mounting point of the engine and the rear fork shaft mounting point, the reinforcing rib plate is provided between the rear fork shaft mounting point and the front mounting point of the rear suspension, the reinforcing rib plate is provided between the lower mounting point of the engine and the front mounting point of the rear suspension, and the reinforcing rib plate is provided between the lower mounting point of the engine and the rear mounting point of the rear suspension.

[0009] As a preferred solution of the present invention, the two reinforcing ribs on the upper portion of the frame rear beam are arranged in an X shape.

[0010] As a preferred solution of the present invention, a through hole is provided in the front beam plate of the frame, and an outer peripheral edge of the through hole is provided with a through hole reinforcement edge protruding toward one side of the outer surface of the front beam plate of the frame.

[0011] As a preferred solution of the present invention, a plurality of via reinforcement ribs are provided on the periphery of the via reinforcement surround, and the via reinforcement ribs are connected between the via reinforcement surround and the edge reinforcement surround.

[0012] Another aspect of the present invention further discloses a method for preparing an integrally formed motorcycle frame, comprising the following steps:

[0013] Step 1: injecting molten aluminum into a die-casting mold, wherein the die-casting mold includes a fixed mold assembly, a movable mold assembly, a left slider assembly, a right slider assembly, and a rear slider assembly. A motorcycle frame cavity is formed between the fixed mold assembly, the movable mold assembly, the left slider assembly, the right slider assembly, and the rear slider assembly. The fixed mold assembly and the movable mold assembly are respectively located on the upper and lower sides of the motorcycle frame cavity, the left slider assembly and the right slider assembly are respectively located on the left and right sides of the motorcycle frame cavity, and the rear slider assembly is located on the rear side of the motorcycle frame cavity.

[0014] Step 2: Push the molten aluminum into the ingate of the die-casting mold at a speed of 0.2 m / s to 0.3 m / s, open the vacuum valve in the die-casting mold, and then push the molten aluminum at an injection speed of 4.5 m / s to 5 m / s. The molten aluminum is accelerated to 60 m / s to 80 m / s in the ingate of the die-casting mold and enters and fills the motorcycle frame cavity. Close the vacuum valve before the molten aluminum is about to fill the motorcycle frame cavity, completing the molten aluminum injection process.

[0015] In step 3, after the motorcycle frame die-casting in the motorcycle frame cavity solidifies, the fixed mold assembly and the movable mold assembly are opened, and then the left slider assembly, the right slider assembly and the rear slider assembly are opened in sequence, and the ejection mechanism of the movable mold assembly ejects the motorcycle frame die-casting.

[0016] As a preferred solution of the present invention, the vacuum valve is located on the rear slider assembly, and the material cake of the die-casting mold is located on the front side of the head pipe of the motorcycle frame die-casting.

[0017] Compared with the prior art, the one-piece motorcycle frame according to the embodiment of the present invention has the following advantages:

[0018] The motorcycle frame of the present invention is an integrated die-cast thin-walled aluminum alloy frame, which saves the assembly process of the frame. Compared with the spliced ​​frame, the integrated frame has high overall precision and stability, improves production efficiency, and achieves lightweight structure. Moreover, the edge reinforcement edges and reinforcement ribs are arranged on the outer sides of the left and right frame bodies to ensure that the frame has sufficient strength and rigidity in all directions. Moreover, the edge reinforcement edges and reinforcement ribs are located in the demoulding direction of the motorcycle frame, which is convenient for rapid demoulding, reduces the difficulty of the die-casting mold structure, and is convenient for setting weight-reducing holes in different directions of the frame to achieve lightweight frame. Moreover, the connecting rod is connected between the rear ends of the left and right frame bodies, so that the motorcycle frame forms a closed frame structure, which not only enhances the rigidity of the entire frame, but also can directly install the engine, subframe, rear fork rear suspension and other components on the frame. It can be seen that the present invention can improve the strength and rigidity of the frame while achieving lightweight motorcycle frame, simplify the manufacturing process, reduce production cost and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0020] Figure 1 A schematic structural diagram of an integrally formed motorcycle frame provided by the present invention;

[0021] Figure 2 A side view of an integrally formed motorcycle frame provided by the present invention;

[0022] Figure 3 A top view of an integrally formed motorcycle frame provided by the present invention;

[0023] Figure 4 A schematic diagram of a left slider assembly, a right slider assembly, and a rear slider assembly provided by the present invention;

[0024] Figure 5 A schematic diagram of the fixed mold assembly and the movable mold assembly provided by the present invention;

[0025] Figure 6 A schematic diagram of filling the die-casting aluminum liquid provided by the present invention;

[0026] Figure 7 A schematic diagram of the location of the ingate provided by the present invention;

[0027] In the figure, the head tube 1; the left frame body (the right frame body) 2; the edge reinforcement surround 21; the reinforcing rib plate 22; the frame front beam plate 23; the engine fixing part 231; the engine front mounting point 232; the through hole 233; the through hole reinforcement surround 234; the through hole reinforcement rib 235; the frame rear beam plate 24; the subframe mounting point 241; the rear shock absorber mounting point 242; the engine middle mounting point 243; the rear fork shaft mounting point 244; the engine lower mounting point 245; the rear suspension front mounting point 246; the rear suspension rear mounting point 247; the connecting rod 3; the die-casting mold 4; the fixed mold assembly 41; the movable mold assembly 42; the left slider assembly 43; the right slider assembly 44; the rear slider assembly 45; the ingate 46; the vacuum valve 47; the injection punch 48; the material cake 49; the aluminum liquid 5. DETAILED DESCRIPTION

[0028] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figures 1 to 3 As shown, an integrally formed motorcycle frame according to a preferred embodiment of the present invention comprises a head tube 1, a left frame body 2, a right frame body 2 and a connecting rod 3, wherein the front end of the left frame body 2 and the front end of the right frame body 2 are symmetrically connected to both sides of the head tube 1, and the front ends of the left and right frame bodies 2 are arranged around the outer periphery of the head tube 1, and the connecting rod 3 is connected between the rear end of the left frame body 2 and the rear end of the right frame body 2. The outer peripheral edges of the left frame body 2 and the right frame body 2 are both provided with an edge reinforcement surround 21 protruding toward one side of the outer surface thereof, and a plurality of reinforcing ribs 22 are arranged on the outer side surface of the left frame body 2 and the outer side surface of the right frame body 2. The motorcycle frame is integrally die-casted from an aluminum alloy material.

[0031] The motorcycle frame of the present invention is an integrated die-cast thin-walled aluminum alloy frame, which saves the assembly process of the frame. Compared with the spliced ​​frame, the integrated frame has high overall precision and stability, improves production efficiency, and achieves lightweight structure. Moreover, the edge reinforcement rim 21 and the reinforcement rib 22 are both arranged on the outer sides of the left and right frame bodies 2 to ensure that the frame has sufficient strength and rigidity in all directions. Moreover, the edge reinforcement rim 21 and the reinforcement rib 22 are located in the demoulding direction of the motorcycle frame, which is convenient for rapid demoulding, reduces the structural difficulty of the die-casting mold 4, and is convenient for setting weight-reducing holes in different directions of the frame to achieve lightweight frame. Moreover, the connecting rod 3 is connected between the rear ends of the left and right frame bodies 2, so that the motorcycle frame forms a closed frame structure, which not only enhances the rigidity of the entire frame, but also can directly install the engine, subframe, rear fork rear suspension and other components on the frame. It can be seen that the present invention can improve the strength and rigidity of the frame while achieving lightweight motorcycle frame, simplify the manufacturing process, reduce production costs, and improve production efficiency.

[0032] In this embodiment, the left frame body 2 and the right frame body 2 both include a frame front beam plate 23 and a frame rear beam plate 24. The frame rear beam plate 24 is connected to the rear end of the frame front beam plate 23 and bends downward. An engine fixing portion 231 extends below the middle portion of the frame front beam plate 23. An engine front mounting point 232 is provided below the engine mounting portion. Two subframe mounting points 241 are provided on the top surface of the frame rear beam plate 24. A rear shock absorber mounting point 242, an engine middle mounting point 243, a rear fork shaft mounting point 244 and an engine lower mounting point 245 are provided on the front side of the frame rear beam plate 24 from top to bottom. A rear suspension front mounting point 246 and a rear suspension rear mounting point 247 are provided at the bottom of the frame rear beam plate 24. The rear suspension front mounting point 246 is located between the engine lower mounting point 245 and the rear suspension rear mounting point 247.

[0033] Exemplarily, a plurality of the reinforcing ribs 22 are arranged along the length direction of the left (right) frame body, and the reinforcing ribs 22 are connected to the edge reinforcement surround 21 to improve the structural strength of the frame body.

[0034] For example, two adjacent reinforcing rib plates 22 in the front beam plate 23 of the frame are connected to form a triangular structure, which can reduce the weight of the frame as much as possible while ensuring the structural strength and rigidity of the frame.

[0035] Exemplarily, the reinforcing rib plate 22 is provided between the rear shock absorber mounting point 242 and the engine middle mounting point 243, the reinforcing rib plate 22 is provided between the engine middle mounting point 243 and the rear fork shaft mounting point 244, the reinforcing rib plate 22 is provided between the rear fork shaft mounting point 244 and the rear suspension front mounting point 246, the reinforcing rib plate 22 is provided between the engine lower mounting point 245 and the rear suspension front mounting point 246, and the reinforcing rib plate 22 is provided between the engine lower mounting point 245 and the rear suspension rear mounting point 247, so as to improve the structural strength and rigidity of the frame rear beam plate 24 and effectively carry the engine and suspension system of the motorcycle.

[0036] Exemplarily, the two reinforcing ribs 22 on the upper portion of the frame rear beam plate 24 are arranged in an X shape, further improving the structural strength of the frame rear beam plate 24 .

[0037] Specifically, a through hole 233 is provided in the front beam plate 23 of the frame, and a through hole reinforcement edge 234 is provided on the outer edge of the through hole 233 which protrudes toward one side of the outer surface of the front beam plate 23 of the frame to reduce local stress concentration and improve overall rigidity.

[0038] In order to further improve the structural strength, a plurality of via reinforcement ribs 235 are provided on the periphery of the via reinforcement surround 234 , and the via reinforcement ribs 235 are connected between the via reinforcement surround 234 and the edge reinforcement surround 21 .

[0039] like Figures 4 to 7 As shown, the present invention also provides a method for preparing the integrally formed motorcycle frame, comprising the following steps:

[0040] Step 1: Inject molten aluminum into a die-casting mold 4. The die-casting mold 4 includes a fixed mold assembly 41, a movable mold assembly 42, a left slider assembly 43, a right slider assembly 44, and a rear slider assembly 45. A motorcycle frame cavity is formed between the fixed mold assembly 41, the movable mold assembly 42, the left slider assembly 43, the right slider assembly 44, and the rear slider assembly 45. The fixed mold assembly 41 and the movable mold assembly 42 are respectively located on the upper and lower sides of the motorcycle frame cavity. The left slider assembly 43 and the right slider assembly 44 are located on the upper and lower sides of the motorcycle frame cavity. The components 44 are respectively located on the left and right sides of the motorcycle frame cavity, and the rear slider assembly 45 is located on the rear side of the motorcycle frame cavity. The die-casting mold 4 requires a high degree of vacuum sealing, and the mating and moving parts such as the insert pins, ejector pins, and sleeves are all equipped with sealing elements. The fixed mold assembly 41, movable mold assembly 42, left slider assembly 43, right slider assembly 44, and rear slider assembly 45 contain the same components as the existing fixed mold assembly 41, movable mold assembly 42, and slider assembly, and will not be repeated here.

[0041] Step 2: The aluminum liquid is pushed into the gate 46 of the die-casting mold 4 at a slow speed of 0.2m / s to 0.3m / s (the aluminum liquid is poured into the barrel and then slowly pushed to the gate position). The vacuum valve 47 in the die-casting mold 4 is opened, and then the injection punch 48 pushes the aluminum liquid at an injection speed of 4.5m / s to 5m / s. The aluminum liquid is accelerated to 60m / s to 80m / s in the gate 46 of the die-casting mold 4 and enters and fills the motorcycle frame cavity. The vacuum valve 47 is closed before the aluminum liquid is about to fill the motorcycle frame cavity, completing the aluminum liquid injection process.

[0042] In step 3, after the motorcycle frame die-casting solidifies within the motorcycle frame cavity, the fixed mold assembly 41 and movable mold assembly 42 are opened. Then, the left slider assembly 43, the right slider assembly 44, and the rear slider assembly 45 are sequentially opened. The ejection mechanism of the movable mold assembly 42 ejects the motorcycle frame die-casting, allowing the motorcycle frame die-casting to be die-casted and ejected from the mold in one step. The motorcycle frame die-casting will subsequently undergo other processes such as despruing, heat treatment, deburring, shot blasting, painting, and machining.

[0043] Specifically, the vacuum valve 47 is located on the rear slider assembly 45 , and the material cake 49 of the die-casting mold 4 is located on the front side of the head pipe 1 of the motorcycle frame die-casting.

[0044] In summary, the motorcycle frame in the present invention is an integrated die-cast thin-walled aluminum alloy frame, which saves the assembly process of the frame. Compared with the spliced ​​frame, the integrated frame has high overall precision and stability, improves production efficiency, and achieves lightweight structure. Moreover, the edge reinforcement rim 21 and the reinforcement rib 22 are both arranged on the outer side of the frame body to ensure that the frame has sufficient strength and rigidity in all directions. Moreover, the edge reinforcement rim 21 and the reinforcement rib 22 are located in the demoulding direction of the motorcycle frame, which is convenient for rapid demoulding, reduces the structural difficulty of the die-casting mold 4, and is convenient for setting weight-reducing holes in different directions of the frame to achieve lightweight frame. Moreover, the connecting rod 3 is connected between the rear ends of the two frame bodies, so that the motorcycle frame forms a closed frame structure, which not only enhances the rigidity of the entire frame, but also can directly install the engine, subframe, rear fork rear suspension and other components on the frame. It can be seen that the present invention can improve the strength and rigidity of the frame while achieving lightweight motorcycle frame, simplify the manufacturing process, reduce production costs, and improve production efficiency.

[0045] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An integrally formed motorcycle frame, characterized in that: The motorcycle frame comprises a head tube, a left frame body, a right frame body and a connecting rod, wherein the front end of the left frame body and the front end of the right frame body are symmetrically connected to both sides of the head tube, and the connecting rod is connected between the rear ends of the left frame body and the right frame body, and the outer peripheral edges of the left frame body and the right frame body are provided with edge reinforcement edges protruding toward one side of the outer surface thereof, and a plurality of reinforcing ribs are arranged on the outer side surface of the left frame body and the outer side surface of the right frame body, and the motorcycle frame is integrally die-casted from an aluminum alloy material.

2. The integrally formed motorcycle frame according to claim 1, wherein: The left frame body and the right frame body both include a frame front beam plate and a frame rear beam plate, the frame rear beam plate is connected to the rear end of the frame front beam plate and bends downward, an engine fixing portion extends below the middle portion of the frame front beam plate, an engine front mounting point is provided below the engine mounting portion, two sub-frame mounting points are provided on the top surface of the frame rear beam plate, a rear shock absorber mounting point, an engine middle mounting point, a rear fork shaft mounting point and an engine lower mounting point are provided from top to bottom on the front side of the frame rear beam plate, a rear suspension front mounting point and a rear suspension rear mounting point are provided at the bottom of the frame rear beam plate, and the rear suspension front mounting point is located between the engine lower mounting point and the rear suspension rear mounting point.

3. The integrally formed motorcycle frame according to claim 2, wherein: The reinforcing rib plate is connected to the edge reinforcement surround.

4. The integrally formed motorcycle frame according to claim 3, wherein: Two adjacent reinforcing rib plates in the front beam plate of the frame are connected to form a triangular structure.

5. The integrally formed motorcycle frame according to claim 2, wherein: The reinforcing rib plate is provided between the rear shock absorber mounting point and the middle mounting point of the engine, the reinforcing rib plate is provided between the middle mounting point of the engine and the rear fork shaft mounting point, the reinforcing rib plate is provided between the rear fork shaft mounting point and the front mounting point of the rear suspension, the reinforcing rib plate is provided between the lower mounting point of the engine and the front mounting point of the rear suspension, and the reinforcing rib plate is provided between the lower mounting point of the engine and the rear mounting point of the rear suspension.

6. The integrally formed motorcycle frame according to claim 5, wherein: The two reinforcing ribs on the upper portion of the frame rear beam plate are arranged in an X shape.

7. The integrally formed motorcycle frame according to claim 2, wherein: A through hole is provided in the front beam plate of the vehicle frame, and an outer peripheral edge of the through hole is provided with a through hole reinforcement edge protruding toward one side of the outer surface of the front beam plate of the vehicle frame.

8. The integrally formed motorcycle frame according to claim 7, wherein: A plurality of via reinforcement ribs are provided on the periphery of the via reinforcement surround, and the via reinforcement ribs are connected between the via reinforcement surround and the edge reinforcement surround.

9. A method for preparing an integrally formed motorcycle frame according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: injecting molten aluminum into a die-casting mold, wherein the die-casting mold includes a fixed mold assembly, a movable mold assembly, a left slider assembly, a right slider assembly, and a rear slider assembly. A motorcycle frame cavity is formed between the fixed mold assembly, the movable mold assembly, the left slider assembly, the right slider assembly, and the rear slider assembly. The fixed mold assembly and the movable mold assembly are respectively located on the upper and lower sides of the motorcycle frame cavity, the left slider assembly and the right slider assembly are respectively located on the left and right sides of the motorcycle frame cavity, and the rear slider assembly is located on the rear side of the motorcycle frame cavity. Step 2: Push the molten aluminum into the ingate of the die-casting mold at a speed of 0.2 m / s to 0.3 m / s, open the vacuum valve in the die-casting mold, and then push the molten aluminum at an injection speed of 4.5 m / s to 5 m / s. The molten aluminum is accelerated to 60 m / s to 80 m / s in the ingate of the die-casting mold and enters and fills the motorcycle frame cavity. Close the vacuum valve before the molten aluminum is about to fill the motorcycle frame cavity, completing the molten aluminum injection process. In step 3, after the motorcycle frame die-casting in the motorcycle frame cavity solidifies, the fixed mold assembly and the movable mold assembly are opened, and then the left slider assembly, the right slider assembly and the rear slider assembly are opened in sequence, and the ejection mechanism of the movable mold assembly ejects the motorcycle frame die-casting.

10. The method for preparing an integrally formed motorcycle frame according to claim 9, wherein: The vacuum valve is located on the rear slider assembly, and the material cake of the die-casting mold is located on the front side of the head pipe of the motorcycle frame die-casting part.

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