A multi-cavity integrated stroller frame

Abstract

The utility model discloses a kind of multi-cavity integrated baby carriage frame, it includes five-cavity head pipe portion, middle pipe shaped in the rear end of five-cavity head pipe portion and two symmetrical bifurcated pipes;The five-cavity head pipe portion includes the first cavity portion distributed in upside, the first cavity short pipe that is pressed in the bottom side of first cavity portion, the second cavity short pipe that is pressed in the bottom side center of first cavity short pipe and two second cavity portions that are symmetrically pressed in the bottom side of first cavity short pipe and the two sides of second cavity short pipe;The middle pipe is formed to the rear extension of first cavity portion, two the bifurcated pipe is formed to the rear extension of two second cavity portions.The utility model is integrally extruded using five-cavity special-shaped pipe material, process is simple, and structure strength is higher, can satisfy lightweight and high rigid demand simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of bicycle manufacturing technology, and in particular to a multi-cavity integrated children's bicycle frame. Background Technology

[0002] Currently, in the bicycle manufacturing industry, especially in traditional children's bicycle frames, a modular welded structure is often used, where the head tube, bottom tube, and fork are welded together to form a single frame. This method is prone to stress concentration at the welded areas, affecting structural strength and posing risks of weld fatigue fracture and structural failure, as well as poor impact resistance. Furthermore, due to the large number of tubes, multiple positioning welds are required, making the production process complex. Additionally, the tube cross-section is limited, meaning strength can only be increased by increasing the thickness of individual tubes, making it difficult to balance lightweight and rigidity requirements. Moreover, the headset installation requires additional sleeves, increasing assembly steps and weight. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a multi-cavity integrated children's stroller frame. It adopts a five-cavity irregular-shaped tube integral extrusion molding, which is simple in process, has higher structural strength, and can simultaneously meet the requirements of lightweight and high rigidity.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A multi-cavity integrated stroller frame includes a five-cavity head tube, a middle tube formed at the rear end of the five-cavity head tube, and two symmetrical branch tubes. The five-cavity head tube section includes a first cavity section distributed on the upper side, a first cavity short tube pressed against the bottom side of the first cavity section, a second cavity short tube pressed against the center of the bottom side of the first cavity short tube, and two second cavity sections symmetrically pressed against both sides of the second cavity short tube and the bottom side of the first cavity short tube. The central tube is formed by extending the first cavity portion backward, and the two branch tubes are formed by extending the second cavity portion backward.

[0005] Furthermore, the five-cavity head tube section is integrally extruded from the front part of the middle tube, the first cavity short tube, the second cavity short tube, and the front parts of the two branch tubes.

[0006] Furthermore, the five-cavity head tube section is provided with bearing mounting holes.

[0007] Furthermore, the bearing mounting hole is stepped.

[0008] Furthermore, a baffle is welded to the front end of the five-cavity head tube.

[0009] Furthermore, the side walls of the first cavity short tube extend rearward to form reinforcing ribs that connect the central tube and the branch tube.

[0010] Furthermore, the bifurcated tube has two perpendicular sidewalls.

[0011] Furthermore, the cross-sectional area of ​​the five-cavity head tube section accounts for 15%-25% of the total area.

[0012] Furthermore, the length of the five-cavity head tube is 100mm-200mm.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects: 1. This utility model adopts a five-cavity irregular-shaped tube integral extrusion molding. Specifically, the first cavity part, the first cavity short tube, the second cavity short tube, and the second cavity part at the front of the two branch tubes are integrally extruded to form a five-cavity head tube part. This overcomes the risk of weld fatigue fracture in traditional welded frames, avoids welding failure, and improves structural strength and impact resistance.

[0014] 2. This utility model differs from the traditional split welding method, eliminating the need for multiple positioning welds, simplifying the production process, and also eliminating the need for additional sleeves for bowl assembly installation, thus simplifying the assembly process and reducing the overall structural weight.

[0015] 3. This utility model, through the integrated design of the five-cavity head tube, the middle tube, and the branch tube, improves the structural strength without the need to thicken the tube material, thus simultaneously meeting the requirements of lightweight and rigidity.

[0016] 4. The bifurcated pipe and the middle pipe at the rear end of the five-cavity head tube of this utility model can be designed into various shapes, thus adapting to more types of vehicles. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the head tube section in Embodiment 5 of this utility model; Figure 2 This is a schematic cross-sectional view of the head tube portion in Embodiment 5 of this utility model; Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this utility model; Figure 5 This is a structural schematic diagram of Embodiment 3 of the present invention; Among them, 1. Five-cavity head tube; 11. First cavity short tube; 12. Second cavity short tube; 100. Bearing mounting hole; 2. Middle tube; 20. First cavity section; 3. Branch tube; 30. Second cavity section; 4. Baffle; 5. Reinforcing rib; 6. Five-way connector. Detailed Implementation

[0018] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Example 1: like Figure 1-3 As shown in this embodiment, a multi-cavity integrated children's stroller frame is provided, which is mainly composed of a five-cavity head tube 1, a middle tube 2, and two branch tubes 3. The middle tube 2 and the two branch tubes 3 are integrally formed at the rear end of the five-cavity head tube 1. The two branch tubes 3 are symmetrically distributed at the bottom and have a bent structure with the branching angle widened to 20°-30°. The middle tube 2 remains straight at the top, and a bottom bracket 6 is welded to the bottom for assembling vehicle parts.

[0020] refer to Figure 1 , 2 As shown, to improve the strength of the frame, in this embodiment, the five-cavity head tube section 1 is specifically composed of a first cavity section 20 distributed on the upper side, a first cavity short tube 11 pressed against the bottom side of the first cavity section 20, a second cavity short tube 12 pressed against the center of the bottom side of the first cavity short tube 11, and two second cavity sections 30 symmetrically pressed against both sides of the second cavity short tube 12 and the bottom side of the first cavity short tube 11. Combined with... Figure 3 As shown, specifically, the central tube 2 is formed by extending the first cavity portion 20 rearward, and the two branch tubes 3 are formed by extending the second cavity portion 30 rearward.

[0021] To be precise, in this embodiment, the five-cavity head tube section 1 is integrally extruded from the front part of the middle tube 2, the first cavity short tube 11, the second cavity short tube 12, and the front parts of the two branch tubes 3. This design can overcome the risk of weld fatigue fracture present in traditional welded frames, avoid welding failure, improve structural strength and impact resistance, and, while improving structural strength, eliminate the need to thicken the tube material, thus simultaneously meeting the requirements of lightweighting and rigidity.

[0022] To accommodate the bearing cup assembly, a bearing mounting hole 100 is provided on the five-cavity head tube section 1 in this embodiment. The bearing mounting hole 100 is stepped. This design differs from the traditional split welding method, eliminating the need for multiple positioning welds, simplifying the production process. Furthermore, the cup assembly installation does not require additional sleeves, simplifying the assembly process and reducing the overall structural weight.

[0023] Specifically, to block wind and water, a baffle 4 is welded to the front end of the five-cavity head tube 1 in this embodiment. To further improve the structural strength, the two side walls of the first cavity short tube 11 in this embodiment extend backward to form reinforcing ribs 5 that connect the middle tube 2 and the branch tube 3, and the branch tube 3 has two perpendicular side walls, so the branch tube 3 has higher structural strength and the load-bearing capacity of the five-cavity head tube 1 after pressing is stronger.

[0024] To maintain the requirements of lightweight and rigidity and to be compatible with most vehicle models, the cross-sectional area of ​​the five-cavity head tube section 1 in this embodiment accounts for 15%-25% of the total area, and the length of the five-cavity head tube section 1 is optimally 100mm-200mm.

[0025] Example 2: refer to Figure 1 , 2 As shown in Figure 4, this second embodiment provides a multi-cavity integrated children's bicycle frame. While retaining most of the features and performance of the first embodiment, only the shapes of the center tube 2 and the two branch tubes 3 are adjusted. The five-cavity head tube 1 is installed inverted, with the two branch tubes 3 on top and in a straight line, while the center tube 2 is bent at the bottom with a bending angle of 105°-115°. A bottom bracket 6 is welded to the bottom for assembling vehicle components. This structure in this second embodiment possesses the aforementioned excellent structural strength performance and can be used to match other bicycle models.

[0026] Example 3: refer to Figure 1 , 2 As shown in Figure 5, in this third embodiment, a multi-cavity integrated children's bicycle frame is provided. While retaining most of the features and performance of the first embodiment, only the shapes of the center tube 2 and the two branch tubes 3 are adjusted. The five-cavity head tube 1 is installed inverted, with the two branch tubes 3 on top and arched, the branching angle gradually increasing to 20°-30°. The center tube 2 is bent at the bottom, and after two bends, a bottom bracket 6 is welded to the bottom for assembling vehicle components. This structure in this third embodiment possesses the aforementioned excellent structural strength performance and can be used to match other bicycle models.

[0027] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The above specific embodiments further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-cavity, one-piece stroller frame, characterized by: It includes a five-lumen head tube (1), a middle tube (2) formed at the rear end of the five-lumen head tube (1), and two symmetrical bifurcated tubes (3). The five-cavity head tube section (1) includes a first cavity section (20) distributed on the upper side, a first cavity short tube (11) pressed against the bottom side of the first cavity section (20), a second cavity short tube (12) pressed against the center of the bottom side of the first cavity short tube (11), and two second cavity sections (30) symmetrically pressed against both sides of the second cavity short tube (12) and the bottom side of the first cavity short tube (11). The central tube (2) is formed by extending the first cavity (20) backward, and the two branch tubes (3) are formed by extending the second cavity (30) backward.

2. The multi-cavity, one-piece stroller frame of claim 1, wherein: The five-cavity head tube section (1) is formed by extruding the front part of the middle tube (2), the first cavity short tube (11), the second cavity short tube (12), and the front parts of the two branch tubes (3) as a single unit.

3. The multi-cavity, one-piece stroller frame of claim 1, wherein: The five-cavity head tube (1) is provided with a bearing mounting hole (100).

4. The multi-cavity integrated stroller frame according to claim 3, characterized in that: The bearing mounting hole (100) is stepped.

5. The multi-cavity integrated stroller frame according to claim 1, characterized in that: The front end of the five-cavity head tube (1) is welded with a baffle (4).

6. The multi-cavity integrated stroller frame according to claim 1, characterized in that: The first cavity short tube (11) has reinforcing ribs (5) extending backward on both sides of its side walls to connect the middle tube (2) and the branch tube (3).

7. The multi-cavity integrated stroller frame according to claim 1, characterized in that: The bifurcation tube (3) has two perpendicular sidewalls.

8. The multi-cavity integrated stroller frame according to claim 1, characterized in that: The cross-sectional area of ​​the five-cavity head tube section (1) accounts for 15%-25% of the total area.

9. The multi-cavity integrated stroller frame according to claim 1, characterized in that: The length of the five-cavity head tube (1) is 100mm-200mm.

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