Motorcycle frame structure
By adding cast steel components and using high-strength steel in key parts of the motorcycle frame, the issues of strength and flexibility of the motorcycle frame were solved, achieving high strength and stable connection of the frame and improving the overall performance of the frame.
Patent Information
- Application Number
- CN202423312442.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-31
AI Technical Summary
The steel tube structure of motorcycle frames is low in cost but has large welding deformation, which affects strength. On the other hand, aluminum alloy frames are expensive and lack flexibility. Furthermore, the flatness and contact area of the bearing mounting surface of traditional head tubes are difficult to guarantee, which leads to directional swaying problems when riding.
Cast steel components are installed at key stress points of the motorcycle frame, including cast steel components for the lower main tube, connecting tube, shock absorber bracket, and side bracket. Mounting holes are added to the cast steel components to reduce tube welding and drilling. High-strength steel is used, and the head tube is a seamless tube to ensure the flatness of the installation and the contact area.
It improves the overall strength and stability of the frame, enhances the connection firmness of the frame, increases the strength by about 30%, and meets the stability requirements of bearing installation.
Smart Images
Figure CN223658341U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motorcycle technical field, concretely relates to a motorcycle frame structure. BACKGROUND
[0002] The frame of general motorcycle is divided into steel pipe type and aluminum alloy frame, the former is low in cost, but welding lug and more punching position on the frame are needed, welding deformation is big, influences the frame strength, the aluminum alloy frame is high in integration, and is die casting forming, but the cost is high, and the frame is insufficient in flexibility.
[0003] The bearing mounting surface of the traditional head pipe is expanded pipe, this mode cannot guarantee the flatness of bearing mounting surface and the contact area of bearing seat surface, and this problem will lead to the problems such as direction swing when the whole vehicle drives. UTILITARIAN CONTENT
[0004] To solve the above technical problem, the utility model provides a high-strength motorcycle frame structure.
[0005] Its technical scheme is as follows: a motorcycle frame structure, including frame, its gist lies in: the lower main pipe cast steel piece is arranged at the engine front suspension mounting position of the frame, the connecting pipe cast steel piece is arranged at the engine rear mounting position, and the shock support cast steel piece is arranged at the rear shock mounting position of the frame, and the shock support cast steel piece is located above the connecting pipe cast steel piece.
[0006] As preferred: one end of the lower main pipe cast steel piece is connected to one end of the front inclined pipe of the frame, the other end is connected to one end of the lower body pipe piece of the frame, and an engine mounting position is further formed in the lower main pipe cast steel piece.
[0007] As preferred: one end of the connecting pipe cast steel piece is connected to the other end of the lower body pipe piece, the other end of the connecting pipe cast steel piece is connected to the upper body pipe piece of the frame, and a rear fork mounting position is formed in the connecting pipe cast steel piece.
[0008] As preferred: a side bracket mounting cast steel plate is connected on one side of the lower body pipe fitting, and the side bracket mounting cast steel plate is close to one side of the connecting pipe cast steel fitting. With the above structure, the side bracket mounting cast steel plate is welded with the lower body pipe fitting, which ensures stable connection and can increase strength.
[0009] As preferred: the damping bracket cast steel fitting is arranged at the middle part of the frame, the front end of the damping bracket cast steel fitting is connected with the front main pipe of the frame, the rear end of the damping bracket cast steel fitting is connected with the rear main pipe of the frame, and the lower body pipe fitting is arranged on the damping bracket cast steel fitting and connected with the damping bracket cast steel fitting. With the above structure, the damping bracket cast steel fitting integrates the connecting support welding points of the middle part of the frame and the lower body of the frame.
[0010] As preferred: the frame further comprises a head pipe, the head pipe is connected with the front inclined pipe and the front main pipe respectively, and the head pipe is a turned seamless pipe. With the above structure, the required installation flatness and contact area of the pressure bearing seat can be effectively met.
[0011] Compared with the prior art, the utility model has the advantages that: under the premise of the frame main body frame, the formed cast steel fitting is increased, and the mounting hole and other characteristics required by the vehicle body are increased on the cast steel fitting, the welding and punching on the pipe fitting are reduced, the strength of the frame is ensured, the steel pipes of most stress parts of the frame are high-strength steel materials, the strength is improved by about 30%, and the main stress points of the frame are cast steel fittings, so that the connection between the tail part of the frame and the front part of the frame is more firm and reliable. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is a structural schematic view of the utility model. DETAILED DESCRIPTION
[0013] The utility model will be further described below in combination with embodiments and drawings.
[0014] As Figure 1 shown, a motorcycle frame structure mainly comprises a frame 1, a lower main pipe cast steel fitting 2 is arranged at an engine front suspension mounting position of the frame 1, a connecting pipe cast steel fitting 3 is arranged at an engine rear mounting position, a damping bracket cast steel fitting 4 is arranged at a rear damping mounting position of the frame 1, and the damping bracket cast steel fitting 4 is located above the connecting pipe cast steel fitting 3.
[0015] One end of the lower main pipe cast steel fitting 2 is connected to one end of a front inclined pipe 1b of the frame 1, and the other end is connected to one end of a lower body pipe fitting 1c of the frame 1, an engine mounting position is further formed in the lower main pipe cast steel fitting 2, and the lower main pipe cast steel fitting 2 not only bears the stress point of the engine, but also bears the stress point of the radiator.
[0016] The one end of the connecting pipe cast steel piece 3 is connected to the other end of the lower body pipe piece 1c, the other end of the connecting pipe cast steel piece 3 is connected to the upper body pipe piece 1d of the frame 1, a rear fork mounting position is formed on the connecting pipe cast steel piece 3, and the piece bears the engine rear mounting point and the main support stress point.
[0017] The side support mounting cast steel plate 5 is connected to one side of the lower body pipe piece 1c, and the side support mounting cast steel plate 5 is close to one side of the connecting pipe cast steel piece 3.
[0018] The shock support cast steel piece 4 is arranged in the middle of the frame 1, the front end of the shock support cast steel piece 4 is connected to the front main pipe 1e of the frame 1, the rear end of the shock support cast steel piece 4 is connected to the rear main pipe 1f of the frame 1, and the lower body pipe piece 1c is arranged in and connected to the shock support cast steel piece 4, and the shock support cast steel piece integrates the connecting support welding points of the middle of the frame and the lower body of the frame.
[0019] The main pipe cast steel piece 2, the connecting pipe cast steel piece 3, the shock support cast steel piece 4 and the side support mounting cast steel plate 5 are added to the steel pipe frame as the main frame, mounting hole positions and other features required by the vehicle body are added to the cast steel pieces, welding and punching on the pipe pieces are reduced, the strength of the frame is ensured, high integration is realized, and high-strength steel is used for most of the stress parts of the frame instead of traditional welded pipes, which is beneficial to improve the strength.
[0020] The frame 1 further comprises a head pipe 1a connected to the front inclined pipe 1b and the front main pipe 1e, respectively, the head pipe 1a is a turned seamless pipe machined integrally, which can effectively meet the installation flatness and contact area required by the pressure bearing seat, so as to meet the installation stability of the pressure bearing seat.
[0021] The frame with the above-mentioned additional formed cast steel pieces is tested, and the CAE analysis results are as follows:
[0022] Passenger condition - side tail box weight 60kg
[0023] Under the passenger condition, the maximum stress 258.7MPa appears on the pipe piece (20CrMo), the yield safety factor is 2.65, the maximum stress of the sheet metal piece is 90.8MPa, the yield safety factor is about 3.74, the maximum stress of the cast piece is 74.2MPa, and the yield safety factor is 3.10. It can be determined that the strength of the frame under the passenger condition meets the analysis requirements.
[0024] Under the condition of the rear load, the maximum stress 313.7MPa appears on the pipe (20CrMo), the yield safety factor is 2.18; the maximum stress of the sheet metal part is 186.7MPa, the yield safety factor is about 1.82, the maximum stress of the casting is 167.9MPa, the yield safety factor is 1.37, and the strength of the frame under the rear load condition meets the analysis requirements.
[0025] Finally, it should be noted that the above description is only the preferred embodiments of the present application, and those skilled in the art can make various similar expressions under the inspiration of the present application without deviating from the purpose and claims of the present application. Such changes fall within the scope of the present application.
Claims
1. A motorcycle frame structure comprising a frame (1), characterized in that: The lower main pipe cast steel piece (2) is arranged at the engine front suspension mounting position of the frame (1), the connecting pipe cast steel piece (3) is arranged at the engine rear mounting position, and the shock absorbing support cast steel piece (4) is arranged at the rear shock absorbing mounting position of the frame (1), and the shock absorbing support cast steel piece (4) is arranged above the connecting pipe cast steel piece (3).
2. A motorcycle frame structure according to claim 1, characterized in that: One end of the lower main pipe cast steel piece (2) is connected to one end of the front inclined pipe (1b) of the frame (1), and the other end is connected to one end of the lower body pipe piece (1c) of the frame (1), and an engine mounting position is further arranged on the lower main pipe cast steel piece (2).
3. A motorcycle frame structure according to claim 2, characterized in that: One end of the connecting pipe cast steel piece (3) is connected to the other end of the lower body pipe piece (1c), and the other end of the connecting pipe cast steel piece (3) is connected to the upper body pipe piece (1d) of the frame (1), and a rear flat fork mounting position is arranged on the connecting pipe cast steel piece (3).
4. A motorcycle frame structure according to claim 2 or 3, characterized in that: A side support mounting cast steel plate (5) is connected to one side of the lower body pipe piece (1c), and the side support mounting cast steel plate (5) is arranged close to one side of the connecting pipe cast steel piece (3).
5. A motorcycle frame structure according to claim 2, characterized in that: The shock absorbing support cast steel piece (4) is arranged at the middle part of the frame (1), the front end of the shock absorbing support cast steel piece (4) is connected to the front main pipe (1e) of the frame (1), the rear end of the shock absorbing support cast steel piece (4) is connected to the rear main pipe (1f) of the frame (1), and the lower body pipe piece (1c) is arranged on and connected to the shock absorbing support cast steel piece (4).
6. A motorcycle frame structure according to claim 5, characterized in that: The frame (1) further comprises a head pipe (1a), the head pipe (1a) is connected to the front inclined pipe (1b) and the front main pipe (1e) respectively, and the head pipe (1a) is a turned seamless pipe.