Combined frame structure for motorcycle and manufacturing method thereof

Abstract

The invention relates to the technical field of motorcycle frames, and discloses a combined frame structure for a motorcycle and a manufacturing method thereof.The combined frame structure comprises a left reference frame, a right reference frame and a connecting unit, and the connecting unit comprises a front suspension steering connecting structure, a supporting structure and a rear suspension connecting structure; the left reference frame, the right reference frame, the front suspension steering connecting structure, the supporting structure and the rear suspension connecting structure are all of an integrated structure formed through die casting. The frame is divided into the left reference frame, the right reference frame and the multiple connecting units in the middle, rapid assembly and disassembly of the frame can be achieved through modular design, the left reference frame, the right reference frame and the connecting structures are all made of alloy materials through a high-precision die-casting process, and the stability of frame combination is improved; a unique steering main beam connecting structure is adopted in the front suspension position, the flexibility and stability of a vehicle head part are guaranteed, and the suspension supporting force of a vehicle tail part meets the stress requirement under the limiting working condition.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycle frames, in particular to a combined frame structure for a motorcycle and a manufacturing method thereof. Background Art

[0002] Traditional motorcycle frames are generally formed by welding steel pipes and steel plates or by casting aluminum alloys. Assembled steel frames have large available space and design freedom, but they have many parts, large welding volume, and large deformation. Aluminum alloy frames have the advantages of light weight, high strength, and few parts, but due to the integrated casting process, the design freedom is general, the available space is limited, and the production equipment requirements are high, and the mold investment is large. Therefore, assembled frames are still the mainstream form in the current motorcycle market. On this basis, how to improve the structural strength of the frame is a problem that needs to be solved urgently. Summary of the invention

[0003] In view of the deficiencies in the prior art, the technical solution adopted by the present invention to solve the technical problems is: a combined frame structure for a motorcycle, including a left reference frame, a right reference frame and a connecting unit arranged between the left reference frame and the right reference frame, the connecting unit including a front suspension steering connecting structure, a supporting structure and a rear suspension connecting structure, the left reference frame, the right reference frame, the front suspension steering connecting structure, the supporting structure and the rear suspension connecting structure are all integrated structures formed by die casting.

[0004] Preferably, the front suspension steering connection structure includes a main connecting tube, and an upper connecting plate and a lower connecting plate are respectively arranged on the outer sides of both ends of the main connecting tube, and the upper connecting plate and the lower connecting plate are connected to the left reference frame and the right reference frame by screws.

[0005] Preferably, a fixing plate is provided at the bottom of the main connecting pipe, and a reinforcement member is provided between the two upper connecting plates and the connecting plate, wherein one end of the reinforcement member is connected to the main connecting pipe, and the other end is connected to the fixing plate.

[0006] Preferably, the support structure comprises a transverse plate and wing plates, the wing plates are respectively arranged at both ends of the transverse plate, and ends of the two wing plates away from the transverse plate are respectively connected to the left reference frame and the right reference frame by screws.

[0007] Preferably, the rear suspension connection structure is arranged in an I-shaped structure, and screw holes for connecting the left reference frame and the right reference frame are respectively provided at both ends of the rear suspension connection structure.

[0008] Preferably, the bottom ends of the left reference frame and the right reference frame are connected by chassis beams respectively.

[0009] Preferably, the chassis beam is arranged in an arc-shaped structure, and a plurality of square grooves are opened at equal intervals on one side of the bottom of the chassis beam, the square grooves run through both sides of the chassis beam, the sides of the chassis beam are provided with through holes and weight-reducing grooves, and the top of the chassis beam is provided with a wavy pit. The weight-reducing groove design effectively improves the acceleration and braking performance of the vehicle by arranging through holes and assembling with the left and right reference frames respectively through screws.

[0010] Preferably, the left reference frame comprises a front suspension portion, a rear suspension portion and a connecting portion, wherein the connecting portion is located between the front suspension portion and the rear suspension portion, and the right reference frame has the same structure as the left reference frame.

[0011] Preferably, the front suspension part is arranged in a Y-shaped structure, the outer ends of the front suspension part heads of the left reference frame and the right reference frame are bent inwardly and assembled together by screws, and the end of the rear suspension part away from the connecting part is bent inwardly.

[0012] The present invention also discloses a method for manufacturing a combined frame structure for a motorcycle, comprising the following steps:

[0013] S1. Manufacturing a mold according to the shapes of the left reference frame, the right reference frame, the front suspension steering connection structure, the support structure, the rear suspension connection structure and the chassis beam;

[0014] S2, preheat the upper and lower molds to 150-200°C, introduce compressed air, nitrogen or argon into the closed aluminum alloy liquid holding furnace, hydraulically fill the mold cavity with aluminum alloy, increase pressure to compensate for shrinkage and maintain pressure for solidification;

[0015] S3, cool the mold to 260-380°C, open the mold, take out the frame blank, and cool it to below 60°C;

[0016] S4, remove the process residue, put it into a heat treatment furnace, heat it to 520-540℃ at a heating rate of less than 150℃ / h, keep it warm for 4-8h, take it out of the furnace and put it into 60-95℃ hot water to cool it for 5min, take it out and cool it for 1-10h, put it into a heat treatment furnace at 150-170℃ for heat treatment again, keep it warm for 6-10h, then take it out of the furnace and cool it to room temperature;

[0017] S5. After surface treatment, the left reference frame and the right reference frame are assembled together by screws, and then the front suspension steering connection structure, the support structure, the rear suspension connection structure and the chassis beam are connected and fixed to the frames on both sides in sequence.

[0018] The beneficial effects of the present invention are as follows: the modular design can realize the rapid assembly and disassembly of the frame, which is convenient for transportation, storage and maintenance, and effectively reduces the cost of use; the left reference frame, the right reference frame and each connecting structure are manufactured by a high-precision die-casting process using alloy materials, which increases the stability of the frame combination, while ensuring accurate dimensions and high surface finish, which is beneficial to reducing wind resistance; the front suspension position adopts a unique steering main beam intersection structure to ensure that the front part of the vehicle has both flexibility and stability, and the suspension support strength of the rear part meets the force requirements under extreme working conditions, and all components are connected by standardized screws, which are easy to install and disassemble, while ensuring the firmness of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is the structural schematic diagram of the left reference frame;

[0021] Figure 3 It is a structural schematic diagram of the chassis beam;

[0022] Figure 4 It is a schematic diagram of the front suspension steering connection structure;

[0023] Figure 5 is a schematic diagram of the supporting structure;

[0024] Figure 6 Schematic diagram of the rear suspension connection structure.

[0025] In the figure: 1. Left reference frame; 11. Front suspension part; 12. Rear suspension part; 13. Connection part; 2. Right reference frame; 3. Front suspension steering connection structure; 31. Main connecting pipe; 32. Upper connecting plate; 33. Lower connecting plate; 34. Fixed plate; 35. Reinforcement; 4. Support structure; 41. Cross plate; 42. Wing plate; 5. Rear suspension connection structure; 51. Screw hole; 6. Chassis beam; 61. Square groove; 62. Through hole; 63. Weight reduction groove; 64. Wave-shaped pit. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0027] like Figure 1As shown, a combined frame structure for motorcycles is mainly composed of a left reference frame 1, a right reference frame 2 and a connecting unit. The modular design can realize rapid assembly and disassembly of the frame, which is convenient for transportation, storage and maintenance, and effectively reduces the cost of use; the left reference frame 1, the right reference frame 2 and the connecting unit are all made of aluminum alloy or magnesium alloy materials through high-precision die-casting process, which increases the stability of the frame combination, while ensuring dimensional accuracy and high surface finish, which is beneficial to reducing wind resistance. Although the cost of alloy materials is higher than that of traditional materials, in the long run, due to the fuel savings and maintenance cost reduction brought by its lightweight, the overall cost of ownership is lower, and in order to extend the service life of the frame, the corrosion resistance of the alloy is enhanced by surface treatment technology, and the frame is used as part of the exterior decoration to reduce the use of plastic products. Aluminum alloy and magnesium alloy are also easy to recycle, melt and reuse, which is in line with the concept of green manufacturing and helps to reduce environmental pollution.

[0028] like Figure 2-3As shown, the left reference frame 1 and the right reference frame 2 have the same structure. The left reference frame 1 includes a front suspension portion 11, a rear suspension portion 12 and a connecting portion 13. The connecting portion 13 is located between the front suspension portion 11 and the rear suspension portion 12, wherein the front suspension portion 11 is arranged in a Y-shaped structure. The outer ends of the heads of the front suspension portions 11 of the left reference frame 1 and the right reference frame 2 are bent inwardly, and the ends of the rear suspension portions 12 away from the connecting portion 13 are bent inwardly, and are assembled together by screws respectively; at the same time, the bottom ends of the left reference frame 1 and the right reference frame 2 are respectively connected by a chassis beam 6 for placing an engine device. The chassis beam 6 is arranged in an arc structure, and a plurality of square grooves 61 are evenly spaced on one side of the bottom of the chassis beam 6. The square grooves 61 pass through both sides of the chassis beam 6. At the same time, a through hole 62 and a weight-reducing groove 63 are arranged on the side of the chassis beam 6, and a wave-shaped pit 64 is also arranged on the top of the chassis beam 6. Due to the unique driving characteristics and force direction of two or three wheels, a simple combined frame cannot ensure that the force of the frame steering structure is reasonably transmitted to the rear of the vehicle body during driving. The frame CAE model is established by using the hypermesh software of Altiar Company in the United States. The frame model scale is: 1224077 units, 414611 nodes, the motor and battery are simulated by mass unit and rigid unit, the passenger mass is 80Kg×2 people=160Kg, and it is simulated by mass unit and rigid unit, and the bolts are Beam units and rigid units are used for simulation, and spring units are used for simulation of front and rear vibration damping. The strength and stiffness of the frame are analyzed under static load vertical conditions, static load bending and torsion conditions, and extreme impact conditions. After many experiments and CAE (computer-aided engineering) simulation analysis, the frame structure is optimized through finite element analysis. A unique steering main beam intersection structure is used at the front suspension position to ensure that the front part has both flexibility and stability. The suspension support strength of the rear part meets the force requirements under extreme conditions, thereby achieving high strength and good seismic performance while reducing weight.

[0029] like Figure 4-6As shown, the connection unit is arranged between the left reference frame 1 and the right reference frame 2, and includes a front suspension steering connection structure 3, a support structure 4 and a rear suspension connection structure 5. The left reference frame 1, the right reference frame 2, the front suspension steering connection structure 3, the support structure 4 and the rear suspension connection structure 5 are all integral structures formed by die casting; the front suspension steering connection structure 3 includes a main connection pipe 31, and an upper connecting plate 32 and a lower connecting plate 33 are respectively arranged on the outer sides of both ends of the main connection pipe 31. The upper connecting plate 32 and the lower connecting plate 33 are connected to the left reference frame 1 and the right reference frame 2 by screws. A fixing plate 34 is provided in the part, and a reinforcement 35 is provided between the two upper connecting plates 32 and the connecting plate 33. One end of the reinforcement 35 is connected to the main connecting pipe 31, and the other end is connected to the fixing plate 34; the supporting structure 4 is used to support the seat cushion, and is composed of a transverse plate 41 and a wing plate 42. The wing plates 42 are respectively arranged at both ends of the transverse plate 41, and the ends of the two wing plates 42 away from the transverse plate 41 are respectively connected to the left reference frame 1 and the right reference frame 2 by screws; the rear suspension connection structure 5 is arranged in an I-shaped structure, and screw holes 51 for connecting the left reference frame 1 and the right reference frame 2 are respectively opened at both ends of the rear suspension connection structure 5.

[0030] All parts are connected by standardized screws, which are easy to install and disassemble, while ensuring the firmness of the overall structure.

[0031] Regarding the manufacturing method of the above-mentioned combined frame structure for motorcycle, the specific steps are as follows:

[0032] S1, manufacturing a mold according to the shapes of the left reference frame 1, the right reference frame 2, the front suspension steering connection structure 3, the support structure 4, the rear suspension connection structure 5 and the chassis beam 6;

[0033] S2, preheat the upper and lower molds to 150-200°C, introduce compressed air, nitrogen or argon into the closed aluminum alloy liquid holding furnace, hydraulically fill the mold cavity with aluminum alloy, increase pressure to compensate for shrinkage and maintain pressure for solidification;

[0034] S3, cool the mold to 260-380°C, open the mold, take out the frame blank, and cool it to below 60°C;

[0035] S4, remove the process residue, put it into a heat treatment furnace, heat it to 520-540℃ at a heating rate of less than 150℃ / h, keep it warm for 4-8h, take it out of the furnace and put it into 60-95℃ hot water to cool it for 5min, take it out and cool it for 1-10h, put it into a heat treatment furnace at 150-170℃ for heat treatment again, keep it warm for 6-10h, then take it out of the furnace and cool it to room temperature;

[0036] S5. After surface treatment, assemble the left reference frame 1 and the right reference frame 2 together with screws, and then sequentially connect and fix the front suspension steering connection structure 3, the support structure 4, the rear suspension connection structure 5 and the chassis beam 6 to the two side frames.

[0037] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A combined frame structure for a motorcycle, characterized in that: The invention comprises a left reference frame (1), a right reference frame (2) and a connection unit arranged between the left reference frame (1) and the right reference frame (2); the connection unit comprises a front suspension steering connection structure (3), a support structure (4) and a rear suspension connection structure (5); the left reference frame (1), the right reference frame (2), the front suspension steering connection structure (3), the support structure (4) and the rear suspension connection structure (5) are all integral structures formed by die casting.

2. The combined frame structure for a motorcycle according to claim 1, characterized in that: The front suspension steering connection structure (3) comprises a main connection tube (31), and an upper connection plate (32) and a lower connection plate (33) are respectively arranged on the outer sides of both ends of the main connection tube (31) in a relative manner, and the upper connection plate (32) and the lower connection plate (33) are connected to the left reference frame (1) and the right reference frame (2) by screws.

3. A motorcycle combined frame structure according to claim 2, characterized in that: A fixing plate (34) is provided at the bottom of the main connecting pipe (31), and a reinforcing member (35) is provided between the two upper connecting plates (32) and the connecting plate (33). One end of the reinforcing member (35) is connected to the main connecting pipe (31), and the other end is connected to the fixing plate (34).

4. The combined frame structure for a motorcycle according to claim 1, characterized in that: The support structure (4) comprises a transverse plate (41) and a wing plate (42), wherein the wing plates (42) are respectively arranged at two ends of the transverse plate (41), and ends of the two wing plates (42) away from the transverse plate (41) are respectively connected to the left reference frame (1) and the right reference frame (2) by screws.

5. The combined frame structure for motorcycle according to claim 1, characterized in that: The rear suspension connection structure (5) is arranged in an I-shaped structure, and screw holes (51) for connecting the left reference frame (1) and the right reference frame (2) are respectively provided at both ends of the rear suspension connection structure (5).

6. The combined frame structure for a motorcycle according to claim 1, characterized in that: The bottom ends of the left reference frame (1) and the right reference frame (2) are respectively connected via chassis beams (6).

7. The combined frame structure for motorcycle according to claim 6, characterized in that: The chassis beam (6) is arranged in an arc-shaped structure, and a plurality of square grooves (61) are provided at equal intervals on one side of the bottom of the chassis beam (6), the square grooves (61) penetrate both sides of the chassis beam (6), a through hole (62) and a weight-reducing groove (63) are provided on the side of the chassis beam (6), and a wave-shaped concave pit (64) is provided on the top of the chassis beam (6).

8. The combined frame structure for a motorcycle according to claim 1, characterized in that: The left reference frame (1) comprises a front suspension part (11), a rear suspension part (12) and a connecting part (13), wherein the connecting part (13) is located between the front suspension part (11) and the rear suspension part (12), and the right reference frame (2) has the same structure as the left reference frame (1).

9. The combined frame structure for a motorcycle according to claim 8, characterized in that: The front suspension part (11) is arranged in a Y-shaped structure, the outer ends of the heads of the front suspension parts (11) of the left reference frame (1) and the right reference frame (2) are bent inwardly and assembled together by screws, and the end of the rear suspension part (12) away from the connecting part (13) is bent inwardly.

10. A method for manufacturing a motorcycle assembled frame structure, comprising the motorcycle assembled frame structure according to claim 1, characterized in that: The following steps are involved: S1, manufacturing a mold according to the shapes of the left reference frame (1), the right reference frame (2), the front suspension steering connection structure (3), the support structure (4), the rear suspension connection structure (5) and the chassis beam (6); S2, preheat the upper and lower molds to 150-200°C, introduce compressed air, nitrogen or argon into the closed aluminum alloy liquid holding furnace, hydraulically fill the mold cavity with aluminum alloy, increase pressure to compensate for shrinkage and maintain pressure for solidification; S3, cool the mold to 260-380°C, open the mold, take out the frame blank, and cool it to below 60°C; S4, remove the process residue, put it into a heat treatment furnace, heat it to 520-540℃ at a heating rate of less than 150℃ / h, keep it warm for 4-8h, take it out of the furnace and put it into 60-95℃ hot water to cool it for 5min, take it out and cool it for 1-10h, put it into a heat treatment furnace at 150-170℃ for heat treatment again, keep it warm for 6-10h, then take it out of the furnace and cool it to room temperature; S5. The left reference frame (1) and the right reference frame (2) are assembled together by screws after surface treatment, and the front suspension steering connection structure (3), the support structure (4), the rear suspension connection structure (5) and the chassis beam (6) are connected and fixed to the vehicle frames on both sides in sequence.

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