Double-bearing tooth piece and injection mold
By introducing transition rings and give way holes into the double bearing teeth, the problems of low processing efficiency and high cost of the double bearing teeth in the prior art are solved, and efficient one-time injection molding is achieved, reducing production costs and extending the mold life.
Patent Information
- Application Number
- CN202421838037.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-31
AI Technical Summary
During the processing process, the existing double bearing gears require secondary injection molding and positioning, resulting in low processing efficiency and high cost.
By introducing a transition ring into the double bearing tooth, the spacing between the first bearing member and the second bearing member is achieved by using the give way holes and the limiting convex ring portion of the transition ring, and the spacing arrangement between the first bearing member and the second bearing member is achieved, and the teething body is positioned and formed simultaneously during one injection molding process.
It improves the processing efficiency of double bearing teeth, reduces production costs, and extends the service life of injection molds.
Smart Images
Figure CN222836203U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transmission component manufacturing, in particular to a double-bearing gear component and an injection mold. Background Art
[0002] The double-bearing gear is a driving component, which is installed on the central shaft and has two bearings between the central shaft. It is commonly found in the driving part of bicycles and electric vehicles and is used to achieve power transmission.
[0003] Traditional dual-bearing gears mostly adopt an all-metal machined structure. Although this manufacturing method can ensure its structural strength, the overall cost is high and its weight is large, which makes the overall weight of the transmission structure large. Therefore, some existing dual-bearing gears adopt a solution of injection molding the gear body on the bearing part, thereby reducing processing costs and component weight.
[0004] Since there are two bearing parts and there is a gap between the two bearing parts, in order to ensure the relative position of the two bearing parts and the tooth part body in the double-bearing tooth part, most of the current processing solutions are secondary injection molding, so as to realize the positioning of the two bearing parts separately, which not only affects the processing efficiency, but also increases the processing cost. Summary of the invention
[0005] In view of the deficiencies in the prior art, the utility model provides a double-bearing gear part and an injection mold with high processing efficiency and strong working stability.
[0006] In order to achieve the above objectives, the utility model is implemented through the following technical solutions.
[0007] The present application provides a dual-bearing gear, comprising:
[0008] The tooth body is provided with a connecting hole along the axial direction;
[0009] The first bearing member has an outer ring fixedly connected to the inner wall of the connecting hole;
[0010] The second bearing member has an outer ring fixedly connected to the inner wall of the connecting hole;
[0011] The transition ring is provided with a clearance hole in the axial direction, is located between the first bearing component and the second bearing component, and the two side end surfaces along the axial direction of the gear component body are respectively in contact with the corresponding side end surfaces of the outer rings of the first bearing component and the second bearing component;
[0012] Wherein, the gear body is injection molded on the first bearing component, the second bearing component and the transition ring, and the inner diameter of the clearance hole is not less than the inner diameter of the inner ring of the first bearing component and the second bearing component.
[0013] It is further defined that in the above-mentioned dual-bearing gear, a limiting convex ring portion is fixedly provided on the end surface of the transition ring away from the second bearing member, and the outer ring of the first bearing member is embedded in the limiting convex ring portion;
[0014] Wherein, the inner diameter of the clearance hole is larger than the inner diameter of the inner ring of the first bearing component.
[0015] It is further defined that in the above-mentioned dual-bearing gear, a limiting convex ring portion is fixedly provided on the end surface of the transition ring away from the first bearing member, and the outer ring of the second bearing member is embedded in the limiting convex ring portion;
[0016] Wherein, the inner diameter of the clearance hole is larger than the inner diameter of the inner ring of the second bearing component.
[0017] The present application also provides an injection mold, wherein the dual-bearing gear member described in any one of the above items comprises a lower mold, an upper mold capable of being pressed together with the lower mold, and an injection unit;
[0018] Among them, the lower mold and the upper mold are pressed together to form a sealed injection cavity, and a positioning shaft that can be plugged with the first bearing component, the second bearing component, and the transition ring is fixed on the inner wall of the injection cavity. The injection unit can inject glue into the injection cavity to form the tooth component body.
[0019] Further defined, in the above-mentioned injection mold, a first cavity is provided on an end surface of the lower mold near the upper mold, and a second cavity is provided on an end surface of the upper mold near the lower mold, and the first cavity and the second cavity can be buckled to form a sealed injection cavity;
[0020] The positioning shaft is fixedly arranged on the inner wall of the first cavity away from the upper die, and a positioning hole capable of being plugged with the positioning shaft is provided on the inner wall of the second cavity away from the lower die.
[0021] It is further defined that in the above-mentioned injection mold, the positioning shaft includes a base fixedly connected to the lower mold and a guide shaft portion fixedly arranged on the base near one end of the upper mold, and the diameter of the base is larger than the diameter of the guide shaft portion;
[0022] Among them, the first bearing component, the second bearing component and the transition ring are arranged on the guide shaft part, and the base is fixed with a supporting convex ring part coaxial with the guide shaft part at one end close to the guide shaft part, and the end face of the supporting convex ring part away from the base is in contact with the corresponding side end face of the outer ring of the second bearing component.
[0023] It is further defined that, in the above-mentioned injection mold, a plurality of first cavities are provided on an end surface of the lower mold close to the upper mold, and a plurality of second cavities are provided on an end surface of the upper mold close to the lower mold;
[0024] The positions of the plurality of first cavities and the plurality of second cavities correspond to each other and can be respectively buckled to form sealed injection molding cavities.
[0025] It is further defined that in the above-mentioned injection mold, the injection unit includes an injection device, a glue feeding part and a glue distribution channel arranged on the upper mold;
[0026] The feeding end of the glue feeding part is connected to the injection molding device, and the discharging end is connected to the glue distributing channel, and the glue distributing channel includes a main pipe connected to the discharging end of the glue feeding part and a plurality of branch pipes respectively connected to the main pipe;
[0027] The ends of the multiple branch pipes away from the main pipe respectively correspond to the positions of the multiple injection cavities and can inject glue into the injection cavities at the corresponding positions.
[0028] It is further defined that the above-mentioned injection mold further includes a top mold assembly arranged on the upper mold and / or the lower mold.
[0029] It is further defined that the above-mentioned injection mold further includes a cooling component arranged on the upper mold and / or the lower mold.
[0030] The utility model has at least the following beneficial effects:
[0031] 1. The interval setting between the first bearing component and the second bearing component is realized by the transition ring, and the first bearing component and the second bearing component can be positioned at the same time when the gear body is injected, that is, the product can be formed by one injection, which greatly improves the product production efficiency;
[0032] 2. When the first bearing component is positioned in the injection mold of the gear body, the limiting convex ring is sleeved on the outer ring of the first bearing component, that is, the first bearing component is positioned with the positioning shaft as the reference, and the transition ring is positioned with the first bearing component as the reference. Since the inner diameter of the clearance hole is larger than the inner diameter of the inner ring of the first bearing component, when the transition ring is positioned, its relative position with the first bearing component is fixed, avoiding the transition ring from shaking so that the inner wall of the clearance hole contacts the outer cylindrical surface of the positioning shaft, that is, preventing the transition ring from scratching the positioning shaft, thereby extending the service life of the injection mold. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 This is a schematic diagram of the structure of a dual-bearing gear according to an embodiment of the present application;
[0034] Figure 2 This is a structural cross-sectional view of a dual-bearing gear member according to an embodiment of the present application;
[0035] Figure 3 This is a schematic diagram of the structure of the injection mold of an embodiment of the present application;
[0036] Figure 4This is a schematic structural diagram of the "lower mold 200" part of the injection mold in the embodiment of the present application;
[0037] Figure 5 This is a schematic structural diagram of the "upper mold 300" part of the injection mold of the embodiment of the present application;
[0038] Figure 6 This is a schematic diagram of the structure of the "injection unit 400" in the injection mold of the embodiment of the present application.
[0039] Figure 7 This is an enlarged schematic diagram of the structure of the "positioning shaft 220" part in the injection mold of the embodiment of the present application;
[0040] Figure 8 This is a structural cross-sectional view of the "positioning shaft 220" portion in the injection mold of the embodiment of the present application.
[0041] Reference numerals
[0042] Gear body 110, connecting hole 111, first bearing member 120, second bearing member 130, transition ring 140, clearance hole 141, limiting convex ring portion 142, lower mold 200, first cavity 210, positioning shaft 220, base 221, guide shaft portion 222, supporting convex ring portion 223, upper mold 300, second cavity 310, positioning hole 320, injection unit 400, glue inlet member 410, glue distribution channel 420. DETAILED DESCRIPTION
[0043] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.
[0044] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0045] The dual-bearing gear and injection mold provided in the embodiment of the present application are described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.
[0046] like Figure 1 , Figure 2 As shown, an embodiment of the present application provides a dual-bearing gear, including a gear body 110, the gear body 110 having a connecting hole 111 extending axially therethrough, and a first bearing member 120, a second bearing member 130, and a transition ring 140 fixedly disposed on the inner wall of the connecting hole 111.
[0047] The transition ring 140 is located between the first bearing component 120 and the second bearing component 130 , and the two side end surfaces along the axial direction of the gear body 110 abut against the corresponding side end surfaces of the outer rings of the first bearing component 120 and the second bearing component 130 .
[0048] Among them, the gear body 110 is injection molded on the first bearing component 120, the second bearing component 130, and the transition ring 140, and the inner wall of the connecting hole 111 is fixedly connected to the outer rings of the first bearing component 120 and the second bearing component 130 respectively. A clearance hole 141 is axially penetrated on the transition ring 140, and the inner diameter of the clearance hole 141 is not less than the inner diameter of the inner ring of the first bearing component 120 and the second bearing component 130.
[0049] In an embodiment of the present application, a dual-bearing tooth component as described above is adopted, and the spacing between the first bearing component 120 and the second bearing component 130 is realized by a transition ring 140. When the tooth component body 110 is injection molded, the first bearing component 120 and the second bearing component 130 can be positioned at the same time, that is, the product can be formed by one injection molding, thereby greatly improving the product production efficiency.
[0050] In a preferred embodiment, Figure 1 , Figure 2 , Figure 8 As shown, a limiting convex ring portion 142 is fixedly provided on the end surface of the transition ring 140 away from the second bearing component 130 , and the outer ring of the first bearing component 120 is embedded in the limiting convex ring portion 142 .
[0051] The inner diameter of the clearance hole 141 is larger than the inner diameter of the inner ring of the first bearing component 120 .
[0052] In an embodiment of the present application, a dual-bearing gear component as described above is adopted. When the first bearing component 120 is positioned in the injection mold of the gear component body 110, the limiting convex ring portion 142 is sleeved on the outer ring of the first bearing component 120, that is, the first bearing component 120 is positioned with the positioning shaft as a reference, and the transition ring 140 is positioned with the first bearing component 120 as a reference. Since the inner diameter of the clearance hole 141 is larger than the inner diameter of the inner ring of the first bearing component 120, when the transition ring 140 is positioned, its relative position with the first bearing component 120 is fixed, thereby preventing the transition ring 140 from shaking so that the inner wall of the clearance hole 141 contacts the outer cylindrical surface of the positioning shaft, thereby preventing the transition ring 140 from scratching the positioning shaft, thereby extending the service life of the injection mold.
[0053] It can be understood that the positioning form of the transition ring 140 is not limited to the above-mentioned one. For example, the limiting convex ring portion 142 can also be set on the end face of the transition ring 140 away from the first bearing component 120, so that the outer ring of the second bearing component 130 is embedded in the limiting convex ring portion 142. At this time, the transition ring 140 is positioned with the second bearing component 130 as a reference; or the limiting convex ring portions 142 can also be respectively set on the end faces on both sides of the transition ring 140, so that the outer rings of the first bearing component 120 and the second bearing component 130 are respectively embedded in the limiting convex ring portions 142 at corresponding positions. At this time, the transition ring 140 is positioned with the first bearing component 120 and the second bearing component 130 as a reference. As long as the indirect positioning of the transition ring 140 and the positioning shaft can be achieved, it will not be elaborated here.
[0054] like Figures 3 to 8 As shown, an embodiment of the present application provides an injection mold for the dual-bearing gear in the above embodiment, including a lower mold 200, an upper mold 300 that can be pressed with the lower mold 200, and an injection unit 400 arranged on the upper mold 300.
[0055] A first cavity 210 is provided on the end surface of the lower mold 200 close to the upper mold 300, and a positioning shaft 220 that can be plugged into the first bearing component 120, the second bearing component 130, and the transition ring 140 is fixed on the inner wall of the first cavity 210 away from the upper mold 300.
[0056] A second cavity 310 is disposed on the end surface of the upper mold 300 close to the lower mold 200 , and a positioning hole 320 capable of being plugged with the positioning shaft 220 is disposed on the inner wall of the second cavity 310 away from the lower mold 200 .
[0057] When the lower mold 200 and the upper mold 300 are pressed together, the first cavity 210 and the second cavity 310 are buckled together to form a sealed injection cavity, and the injection unit 400 can inject glue into the injection cavity to form the tooth body 110 .
[0058] When performing injection molding, the second bearing component 130, the transition ring 140, and the first bearing component 120 are first sleeved on the positioning shaft 220 in sequence, the outer ring of the first bearing component 120 is embedded in the limiting convex ring portion 142, and the transition ring 140 is respectively abutted against the corresponding side end faces of the outer rings of the first bearing component 120 and the second bearing component 130 at both ends in the axial direction. After the first bearing component 120, the second bearing component 130, and the transition ring 140 are positioned, the upper mold 300 moves toward the side close to the lower mold 200 until it is pressed together, and the first cavity 210 and the second cavity 310 are buckled to form a sealed injection cavity, and the positioning shaft 220 is plugged into the positioning hole 320 at one end away from the lower mold 200. When the lower mold 200 and the upper mold 300 are completely pressed together, the injection unit 400 is started and glue is injected into the injection cavity, thereby realizing the injection molding of the tooth body 110 on the first bearing component 120, the second bearing component 130, and the transition ring 140.
[0059] In a preferred embodiment, Figure 8 As shown, the positioning shaft 220 includes a base 221 fixedly connected to the lower mold 200 and a guide shaft portion 222 fixedly arranged at one end of the base 221 close to the upper mold 300 , and the diameter of the base 221 is larger than the diameter of the guide shaft portion 222 .
[0060] Among them, the first bearing component 120, the second bearing component 130, and the transition ring 140 are sleeved on the guide shaft portion 222, and a supporting convex ring portion 223 coaxial with the guide shaft portion 222 is fixedly provided at one end of the base 221 close to the guide shaft portion 222, and the end face of the supporting convex ring portion 223 away from the base 221 abuts against the corresponding side end face of the outer ring of the second bearing component 130.
[0061] It can be understood that the supporting convex ring portion 223 can realize the axial positioning of the first bearing component 120, the second bearing component 130, and the transition ring 140 on the guide shaft portion 222, thereby ensuring the matching accuracy of the first bearing component 120, the second bearing component 130, the transition ring 140 and the gear body 110.
[0062] In a preferred embodiment, Figures 4 to 6 As shown, a plurality of first cavities 210 are provided on the end surface of the lower mold 200 close to the upper mold 300, and a plurality of second cavities 310 are provided on the end surface of the upper mold 300 close to the lower mold 200. The positions of the plurality of first cavities 210 and the plurality of second cavities 310 correspond to each other and can be respectively buckled to form a sealed injection cavity.
[0063] It is understandable that after a plurality of injection cavities are provided on the injection mold, the lower mold 200 and the upper mold 300 can be pressed together once to produce a plurality of dual-bearing gears at the same time, thereby further improving the production efficiency.
[0064] In a preferred embodiment, Figure 7As shown, the injection unit 400 includes an injection device, a glue feeding member 410 and a glue distribution channel 420 arranged on the upper mold 300.
[0065] Among them, the feeding end of the glue feeding part 410 is connected to the injection molding device, and the discharging end is connected to the glue distribution channel 420. The glue distribution channel 420 includes a main pipe connected to the discharging end of the glue feeding part 410 and multiple branch pipes respectively connected to the main pipe. The multiple branch pipes are away from one end of the main pipe and correspond to the positions of multiple injection cavities respectively and can inject glue into the injection cavities at the corresponding positions.
[0066] It is understandable that the setting form of the injection unit is not limited to the above-mentioned one. For example, the injection molding device and the glue feeding part 410 and the glue distribution channel 420 can be set on the lower mold 200. At this time, the outflow direction of the glue will change, but the glue injection inside the injection cavity can also be performed, which will not be elaborated here.
[0067] In a preferred embodiment, it also includes a top mold assembly disposed on the lower mold 200 and / or the upper mold 300 .
[0068] It is understandable that after the injection molding of the tooth body 110 is completed, the double-bearing tooth can be pushed out of the injection molding cavity by the top mold assembly, so as to facilitate the demolding and unloading of the finished double-bearing tooth.
[0069] In a preferred embodiment, a cooling assembly is further included which is arranged on the lower mold 200 and / or the upper mold 300 .
[0070] The cooling assembly includes a cooling liquid flow channel disposed in the lower mold 200 and / or the upper mold 300, and the interior of the injection cavity can be cooled by the cooling liquid flowing in the cooling liquid flow channel.
[0071] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0072] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. A dual-bearing gear, characterized in that: include: The tooth body is provided with a connecting hole along the axial direction; The first bearing member has an outer ring fixedly connected to the inner wall of the connecting hole; The second bearing member has an outer ring fixedly connected to the inner wall of the connecting hole; The transition ring is provided with a clearance hole in the axial direction, is located between the first bearing component and the second bearing component, and the two side end surfaces along the axial direction of the gear component body are respectively in contact with the corresponding side end surfaces of the outer rings of the first bearing component and the second bearing component; Wherein, the gear body is injection molded on the first bearing component, the second bearing component and the transition ring, and the inner diameter of the clearance hole is not less than the inner diameter of the inner ring of the first bearing component and the second bearing component.
2. A dual-bearing gear according to claim 1, characterized in that: A limiting convex ring portion is fixedly provided on the end surface of the transition ring away from the second bearing component, and the outer ring of the first bearing component is embedded in the limiting convex ring portion; Wherein, the inner diameter of the clearance hole is larger than the inner diameter of the inner ring of the first bearing component.
3. A dual-bearing gear according to claim 1, characterized in that: A limiting convex ring portion is fixedly provided on the end surface of the transition ring away from the first bearing component, and the outer ring of the second bearing component is embedded in the limiting convex ring portion; Wherein, the inner diameter of the clearance hole is larger than the inner diameter of the inner ring of the second bearing component.
4. An injection mold, characterized in that: A dual-bearing gear according to any one of claims 1 to 3, comprising a lower die, an upper die capable of being pressed together with the lower die, and an injection molding unit; Among them, the lower mold and the upper mold are pressed together to form a sealed injection cavity, and a positioning shaft that can be plugged with the first bearing component, the second bearing component, and the transition ring is fixed on the inner wall of the injection cavity. The injection unit can inject glue into the injection cavity to form the tooth component body.
5. An injection mold according to claim 4, characterized in that: A first cavity is provided on the end surface of the lower mold close to the upper mold, and a second cavity is provided on the end surface of the upper mold close to the lower mold. The first cavity and the second cavity can be buckled to form a sealed injection cavity; The positioning shaft is fixedly arranged on the inner wall of the first cavity away from the upper die, and a positioning hole capable of being plugged with the positioning shaft is provided on the inner wall of the second cavity away from the lower die.
6. An injection mold according to claim 4, characterized in that: The positioning shaft comprises a base portion fixedly connected to the lower die and a guide shaft portion fixedly arranged on one end of the base portion close to the upper die, wherein the diameter of the base portion is larger than the diameter of the guide shaft portion; Among them, the first bearing component, the second bearing component and the transition ring are arranged on the guide shaft part, and the base is fixed with a supporting convex ring part coaxial with the guide shaft part at one end close to the guide shaft part, and the end face of the supporting convex ring part away from the base is in contact with the corresponding side end face of the outer ring of the second bearing component.
7. An injection mold according to any one of claims 4 to 6, characterized in that: The lower mold has a plurality of first cavities on its end surface close to the upper mold, and the upper mold has a plurality of second cavities on its end surface close to the lower mold; The positions of the plurality of first cavities and the plurality of second cavities correspond to each other and can be respectively buckled to form sealed injection molding cavities.
8. An injection mold according to claim 7, characterized in that: The injection unit comprises an injection device, a glue feeding part and a glue dispensing channel arranged on the upper mold; The feeding end of the glue feeding part is connected to the injection molding device, and the discharging end is connected to the glue distributing channel, and the glue distributing channel includes a main pipe connected to the discharging end of the glue feeding part and a plurality of branch pipes respectively connected to the main pipe; The ends of the multiple branch pipes away from the main pipe respectively correspond to the positions of the multiple injection cavities and can inject glue into the injection cavities at the corresponding positions.
9. The injection mold according to claim 4, characterized in that: Also included is a top mold assembly disposed on the upper mold and / or the lower mold.
10. The injection mold according to claim 4, characterized in that: Also included is a cooling assembly disposed on the upper mold and / or the lower mold.