Injection-molded bicycle hub hub and injection mold thereof
Through injection molding and the design of pre-embedded metal lining, the problems of large weight and high production cost of bicycle drum shafts are solved, lightweight and cost reduction are achieved, and the appearance quality and strength of the product are improved.
Patent Information
- Application Number
- CN202420681858.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-04-03
AI Technical Summary
The existing bicycle hub axle skin has problems of large weight and high production costs, which is difficult to meet the needs of lightweight vehicles.
The bicycle drum shaft skin is manufactured using injection molding process, and metal linings are embedded in the drum trays at both ends of the shaft skin. Through the innovative design of the injection mold, the shaft tare weight is reduced and the production cost is reduced.
It achieves lightweight and cost reduction of bicycle hub axle leather, while improving the appearance quality and strength of the product, meeting the requirements of lightweighting of the vehicle body.
Smart Images
Figure CN222663072U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of bicycles, in particular to an injection-molded bicycle hub axle skin and an injection mold thereof. Background Art
[0002] The bicycle hub is a component that connects the frame and the wheel spokes, including bearings and axles (the axles are the shells of the hubs). The axles are in the shape of a sleeve that is thick at both ends and thin in the middle. The wheel axle passes through the axles, and the bearings are embedded in the annular structure between the two ends of the axles and the wheel axle. There are drums for installing spokes at both ends of the axles. At present, most bicycle hubs use iron axles or aluminum alloy axles. Iron axles are generally used in ordinary household bicycles. They have the advantages of low production cost and good crack resistance, but they have the disadvantage of being heavy and do not conform to the concept of lightweight body. Aluminum alloy axles are usually used in mountain bikes. They are light in weight, but their production cost is high. Utility Model Content
[0003] The utility model provides an injection-molded bicycle hub axle skin and an injection mold thereof, aiming to solve the problems of heavy weight of the iron axle skin and high production cost of the aluminum alloy axle skin by improving the structure of the injection-molded bicycle hub axle skin and innovatively designing the injection molding mold, so as to achieve the purpose of ensuring product quality, reducing production costs and meeting the requirements for lightweight vehicle bodies.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] The invention discloses an injection-molded bicycle hub axle skin, which is in the shape of a sleeve with thick ends and a thin middle, and drum discs for mounting spokes are arranged at both ends of the bicycle hub axle skin; the bicycle hub axle skin is formed by an injection molding process, and metal linings are embedded in the drum discs at both ends of the bicycle hub axle skin, and the metal linings are wrapped in injection molding material; a plurality of spoke mounting holes penetrating the metal linings are evenly arranged in the circumferential direction of the drum disc.
[0006] The above-mentioned injection-molded bicycle hub axle skin, the metal lining is in the shape of a circular ring, and the central axis thereof coincides with the central axis of the bicycle hub axle skin.
[0007] The above-mentioned injection-molded bicycle hub axle skin, the metal lining is an iron sheet.
[0008] The injection-molded bicycle hub axle skin has an outer surface of a middle portion of a sleeve that is an inwardly concave arc surface, and a fillet transition is provided between the arc surface and the hub disc.
[0009] A bicycle hub axle skin injection mold is used to complete the injection molding of the above-mentioned bicycle hub axle skin blank, and it comprises an end mold, a fixed mold, a movable mold, a mold core and a mandrel; the mandrel is assembled with the mold base of the injection mold, and the mold core is mounted outside the mandrel; the outer surface of the mold core matches the inner shape of the bicycle hub axle skin; the fixed mold and the movable mold are arranged relatively, and a gate is provided on the fixed mold; the end mold is arranged on both sides of the fixed mold and the movable mold, and the end mold, the fixed mold and the movable mold are enclosed to form a mold cavity matching the outer shape of the bicycle hub axle skin, and the mold core is located in the mold cavity; its special feature is that: metal linings are embedded at the two ends of the mold cavity at the positions corresponding to the drum disc in the bicycle hub axle skin, and metal lining positioning columns are provided on the inner side surface of the end mold; the number and position of the metal lining positioning columns are consistent with the spoke mounting holes on the drum disc of the bicycle hub axle skin.
[0010] The above-mentioned bicycle hub axle skin injection mold, the metal lining positioning column is a stepped cylindrical structure with different diameters at both ends, the large diameter end is connected to the inner side of the end mold as a whole, the large diameter end size matches the diameter size of the elbow end of the spoke, and the small diameter end size is larger than the spoke diameter size.
[0011] The above-mentioned bicycle hub axle skin injection mold has a plurality of magnet assembly holes symmetrically arranged on the outer side surface of the end mold, and strong magnets are embedded in the magnet assembly holes; the magnet assembly holes and the strong magnets are distributed around the core positioning axis, located in the area opposite to the metal lining, and staggered with the metal lining positioning column.
[0012] In the above-mentioned bicycle hub axle skin injection mold, the number of the metal lining positioning columns is six groups; the number of the strong magnets is four groups.
[0013] The utility model provides an injection-molded bicycle hub axle skin and an injection mold thereof. The bicycle hub axle skin is molded by an injection molding process, which not only reduces the weight of the axle skin, but also makes the outer contour of the axle skin smooth and full by designing the injection mold structure, thereby improving the appearance quality of the bicycle hub axle skin; because the bicycle hub axle skin of the utility model has metal linings embedded in the drum discs at both ends thereof, the strength of the drum discs made of injection molding material is improved by the metal linings. In short, the utility model achieves the purpose of ensuring the product quality of the bicycle hub axle skin, reducing production costs, and meeting the requirements for lightweight vehicle bodies. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the structure of the injection-molded bicycle hub axle skin of the utility model;
[0015] Figure 2 yes Figure 1 Schematic diagram of the AA section structure;
[0016] Figure 3This is a schematic diagram (partial) of the structure of the injection mold for the bicycle hub axle skin of the utility model;
[0017] Figure 4 yes Figure 3 Schematic diagram of the structure of the middle BB section;
[0018] Figure 5 yes Figure 3 Schematic diagram of the CC cross-section structure;
[0019] Figure 6 yes Figure 3 Enlarged view of the structure at position Ⅰ in the middle.
[0020] Explanation of the symbols in the figure:
[0021] 1 is a bicycle hub axle skin, 1-1 is a metal lining, 1-2 is a spoke mounting hole, and 1-3 is an arc surface;
[0022] 2 is an injection mold for a bicycle hub skin, 2-1 is an end mold, 2-2 is a fixed mold, 2-3 is a movable mold, 2-4 is a gate, 2-5 is a mold core, 2-6 is a core shaft, 2-7 is a strong magnet, 2-8 is a mold cavity, and 2-9 is a metal lining positioning column. DETAILED DESCRIPTION
[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.
[0024] See Figure 1. Figure 2 The utility model provides an injection-molded bicycle hub axle skin, wherein the bicycle hub axle skin 1 is in the shape of a sleeve with thick ends and a thin middle, and is formed by an injection molding process. Drum discs for installing bicycle spokes are arranged at both ends of the bicycle hub axle skin, and the outer wall of the middle part of the sleeve is an arc surface 1-3, and the arc surface 1-3 is formed by a concave curve generatrix, and the arc surface 1-3 and the drum disc are transitioned by a fillet; the bicycle hub axle skin 1 has metal linings 1-1 embedded in the drum discs at both ends of the bicycle hub axle skin 1, and the metal lining 1-1 is a ring-shaped iron sheet wrapped in an injection molding material, and the central axis of the metal lining 1-1 coincides with the central axis of the bicycle hub axle skin 1; a plurality of spoke mounting holes 1-2 penetrating the metal lining are evenly arranged in the circumference of the drum disc. The bicycle hub axle skin 1 described in the utility model can be applied to baby carriages. By adding different pigments to the injection molding material, a colorful bicycle hub axle skin 1 product can be directly formed to keep the color coordinated with the baby carriage frame. Different colors or patterns can also be coated on its surface through a baking paint process to mobilize childishness and bring a happy experience to children.
[0025] See also Figure 3 , Figure 4 , Figure 5The utility model also provides a bicycle hub axle skin injection mold, the bicycle hub axle skin injection mold 2 comprises an end mold 2-1, a fixed mold 2-2, a movable mold 2-3, a mold core 2-5 and a mandrel 2-6; the mandrel 2-6 is assembled with a mold base of the injection mold, and the mold core 2-5 is mounted outside the mandrel 2-6; the outer surface of the mold core 2-5 matches the inner shape of the bicycle hub axle skin 1; the fixed mold 2-2 and the movable mold 2-3 are arranged oppositely, and a gate 2-4 is provided on the fixed mold 2-2; the end mold 2-1 is arranged on the fixed mold 2-2 and both sides of the movable mold 2-3, the end mold 2-1, the fixed mold 2-2, and the movable mold 2-3 enclose a mold cavity 2-8 that matches the outer contour shape of the bicycle hub shaft skin 1, and the mold core 2-5 is located in the mold cavity 2-8; its special feature is that: a metal lining 1-1 made of iron sheet material is embedded at both ends of the mold cavity 2-8 at the corresponding positions of the drum disc in the bicycle hub shaft skin 1, and a metal lining positioning column 2-9 is arranged on the inner side surface of the end mold 2-1; the number and position of the metal lining positioning columns 2-9 are consistent with the spoke mounting holes 1-2 on the drum disc of the bicycle hub shaft skin 1.
[0026] See also Figure 3 , Figure 6 The bicycle hub axle skin injection mold described in the utility model has a metal lining positioning column 2-9 which is a stepped cylindrical structure with different diameters at both ends. The large diameter end of the metal lining positioning column 2-9 is connected to the inner side surface of the end mold 2-1 as a whole. The size of the large diameter end matches the diameter size of the elbow end of the bicycle spoke, and the size of the small diameter end is larger than the diameter size of the bicycle spoke.
[0027] See also Figure 3 , Figure 4 The bicycle hub axle skin injection mold described in the utility model has a plurality of magnet assembly holes symmetrically arranged on the outer side surface of its end mold 2-1, and strong magnets 2-7 are embedded in the magnet assembly holes; the magnet assembly holes and the strong magnets 2-7 are distributed around the core shaft 2-6, located in the area opposite to the metal lining 1-1, and staggered with the metal lining positioning columns 2-9. In a preferred embodiment of the utility model, the number of the metal lining positioning columns 2-9 is six groups, and the number of the strong magnets 2-7 is four groups.
[0028] See also Figures 3 to 6When the bicycle hub axle skin injection mold of the utility model is used for injection molding of the bicycle hub axle skin 1, a metal lining 1-1 (iron sheet) corresponding to the size and model of the bicycle hub axle skin 1 is selected, and the metal lining 1-1 is assembled with the metal lining positioning columns 2-9 in the end molds 2-1 on both sides, and the metal lining 1-1 is adsorbed and fixed by the strong magnet 2-7; the rear end mold 2-1, the fixed mold 2-2, the movable mold 2-3 and the mold core are combined to form a mold cavity 2-8, wherein the end mold 2-1, the fixed mold 2-2, and the movable mold 2-3 are enclosed to form an outer wall of the mold cavity 2-8 matching the outer contour shape of the bicycle hub axle skin 1 product, and the outer surface of the mold core 2-5 forms an inner wall of the mold cavity matching the inner cavity shape of the bicycle hub axle skin 1 product; the molten rubber and plastic material is injected into the mold cavity 2-8 through the gate 2-4, and the pressure is maintained and cooled for a set time; the mold is opened, and the injection-molded bicycle hub axle skin 1 is taken out to complete the injection molding of the bicycle hub axle skin 1 blank.
Claims
1. An injection molded bicycle hub axle skin, characterized in that: The bicycle hub axle skin (1) is in the shape of a sleeve that is thick at both ends and thin in the middle, and is provided with drum discs for mounting spokes at both ends; the bicycle hub axle skin is formed by an injection molding process, and metal linings (1-1) are pre-embedded in the drum discs at both ends, and the metal linings (1-1) are wrapped in an injection molding material; and a plurality of spoke mounting holes (1-2) that penetrate the metal linings are evenly arranged in the circumference of the drum disc.
2. The injection molded bicycle hub axle skin according to claim 1, characterized in that: The metal lining (1-1) is in the shape of a circular ring, and its central axis coincides with the central axis of the bicycle hub axle skin (1).
3. The injection molded bicycle hub axle skin according to claim 2, characterized in that: The metal lining (1-1) is an iron sheet.
4. The injection molded bicycle hub axle skin according to claim 1, 2 or 3, characterized in that: The outer surface of the middle part of the sleeve is an inwardly concave arc surface (1-3), and a rounded transition is provided between the arc surface (1-3) and the drum plate.
5. A bicycle hub axle skin injection mold, used for completing the injection molding of the bicycle hub axle skin blank as claimed in any one of claims 1 to 4, comprising an end mold (2-1), a fixed mold (2-2), a movable mold (2-3), a mold core (2-5) and a mandrel (2-6); the mandrel (2-6) is assembled with a mold base of the injection mold, and the mold core (2-5) is mounted outside the mandrel (2-6); the outer surface of the mold core (2-5) is aligned with the inner cavity of the bicycle hub axle skin (1) The fixed mold (2-2) and the movable mold (2-3) are arranged relative to each other, and a gate (2-4) is provided on the fixed mold (2-2); the end mold (2-1) is arranged on both sides of the fixed mold (2-2) and the movable mold (2-3); the end mold (2-1), the fixed mold (2-2), and the movable mold (2-3) enclose a mold cavity (2-8) that matches the outer shape of the bicycle hub axle skin (1); and the mold core (2-5) is located in the mold cavity (2-8); the characteristics are: Metal linings (1-1) are embedded at the two ends of the mold cavity (2-8) at positions corresponding to the drum disc of the bicycle hub axle skin (1), and metal lining positioning columns (2-9) are arranged on the inner side surface of the end mold (2-1); the number and positions of the metal lining positioning columns (2-9) are consistent with the spoke mounting holes (1-2) on the drum disc of the bicycle hub axle skin (1).
6. The bicycle hub axle skin injection mold according to claim 5, characterized in that: The metal lining positioning column (2-9) is a stepped cylindrical structure with different diameters at both ends, wherein the large diameter end is integrally connected to the inner side surface of the end mold (2-1), the size of the large diameter end matches the diameter size of the elbow end of the spoke, and the size of the small diameter end is larger than the diameter size of the spoke.
7. The bicycle hub axle skin injection mold according to claim 5 or 6, characterized in that: A plurality of magnet assembly holes are symmetrically arranged on the outer side surface of the end mold (2-1), and strong magnets (2-7) are embedded in the magnet assembly holes; the magnet assembly holes and the strong magnets (2-7) are distributed around the core shaft (2-6), are located in a region opposite to the metal lining (1-1), and are staggered with the metal lining positioning columns (2-9).
8. The bicycle hub axle skin injection mold according to claim 7, characterized in that: The number of the metal lining positioning columns (2-9) is six groups; the number of the strong magnets (2-7) is four groups.