Output gear set structure
Through the limit structure design of metal output gears and plastic pulleys, the problem of insufficient rigidity of the output gear material in the prior art is solved, and the effect of stable connection and weight reduction is achieved, and the effect of reducing costs is achieved.
Patent Information
- Application Number
- CN202420590012.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The output gears in existing small gear boxes are not rigid enough, especially the output gears made of pure plastic materials that easily cause deformation or cracking of the plastic pulley when connecting the output shaft.
Using a combined structure of metal output gear and plastic pulley, the design of limiting projections at the rubber-encapsulated end and annular limit grooves combined with hollow sections and gear sections to achieve a stable connection between metal gear and plastic pulley, and through D-shaped The shaft hole does not require a key pin to fix the output shaft.
The deformation prevention and connection stability of the plastic pulley is achieved, weight and processing processes are reduced, cost is reduced, and transmission performance is improved.
Smart Images
Figure CN222277424U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a transmission accessory of a toy gear box, in particular to an output gear set structure. Background Art
[0002] The output gear in a small gearbox is a key component that affects the transmission performance. The output gear is directly connected to the output shaft. Existing output gears are generally made of pure plastic or semi-plastic materials. The pure plastic output gear is not rigid enough when connected to the output shaft; and the semi-plastic material is composed of a metal gear and a plastic pulley. When assembled, it is connected by an interference fit, with one end of the metal gear pressed on the plastic pulley. The interference fit easily causes the plastic pulley to deform or break. Summary of the invention
[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide an output gear set structure.
[0004] The purpose of the utility model is achieved through the following technical solutions: an output gear set structure, including a metal output gear and a plastic pulley, the metal output gear has a rubber-coated end, the edge of the rubber-coated end is provided with a plurality of limiting protrusions at intervals, the rubber-coated end is provided with a limiting hole corresponding to the position of each limiting protrusion, the middle part of the plastic pulley has a sleeve hole, the side wall of the sleeve hole is provided with an annular limiting groove, the rubber-coated end is inserted into the plastic pulley from the sleeve hole, and the limiting protrusion of the rubber-coated end is embedded in the annular limiting groove and fixed. The metal output gear is an integrated structure formed by metal powder casting and sintering, the plastic pulley has a limiting structure connected and fixed to the metal output gear, the plastic pulley is connected to the transmission belt, and the transmission belt is connected to the drive.
[0005] As an improvement of the output gear set structure of the utility model, a plurality of side grooves are arranged on the side wall of the annular limiting groove at intervals, and the number of the side grooves is the same as the number of the limiting protrusions, and each limiting protrusion is embedded in one of the side grooves. The annular limiting groove can be wrapped around the rubber-coated end of the metal output gear, and can be fixedly connected through the limiting protrusion, the limiting column and the limiting hole to limit the relative movement of the metal gear and the plastic pulley.
[0006] As an improvement to the output gear set structure of the utility model, the annular limit groove has a bottom and a top, and a plurality of limit columns are arranged at intervals at the bottom of the annular limit groove. The limit columns correspond to the limit holes one by one, and when the plastic pulley is wrapped around the rubber-coated end, the limit columns are inserted into the limit holes.
[0007] As an improvement to the output gear set structure of the utility model, the end of the limiting column extends all the way to the top of the annular limiting groove, and the edge of the rubber-coated end is embedded between the limiting column and the top of the annular limiting groove.
[0008] As an improvement to the output gear set structure of the utility model, tooth grooves are arranged at intervals on the outer edge contour of the plastic belt wheel, and position limiting side plates are arranged on the side surfaces of the plastic belt wheel at positions corresponding to the tooth grooves.
[0009] As an improvement of the output gear set structure of the utility model, the metal output gear is further provided with an axial hole, the cross section of which is D-shaped. The axial hole is used to plug in the output shaft, and the plug-in end of the output shaft is arranged in a D-shape, which cooperates with the D-shaped axial hole, and does not need to be fixedly connected with a key or a pin.
[0010] As an improvement of the output gear set structure of the utility model, the metal output gear also has a hollow section and a gear section, the hollow section has an intermediate hole in the axial direction, and the intermediate hole is provided with multiple hollow holes at intervals on the circumference, and the intermediate hole is connected to the shaft hole. The internal hollow design of the hollow section can reduce weight.
[0011] As an improvement to the output gear set structure of the utility model, the hollow section is located between the gear section and the rubber-coated end, and the shaft hole is arranged in the gear section.
[0012] The beneficial effect of the utility model is that the utility model reduces weight and reduces processing steps to achieve the purpose of reducing costs by optimizing the structural design while maintaining the same function and appearance. The metal output gear is connected and fixed to the plastic pulley by rubber coating, which can prevent the plastic pulley from deforming and ensure stable connection. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a three-dimensional diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the first direction of the metal output gear and the plastic pulley of the utility model in a separated state;
[0015] Figure 3 It is a schematic diagram of the second direction of the metal output gear and the plastic pulley of the utility model in a separated state;
[0016] The accompanying drawings are marked as follows: 1. Metal output gear, 2. Plastic pulley, 11. Rubber-coated end, 12. Limiting protrusion, 13. Limiting hole, 14. Shaft hole, 15. Hollow section, 16. Gear section, 17. Middle hole, 18. Hollow hole, 21. Sleeve hole, 22. Annular limiting groove, 23. Limiting column, 24. Tooth groove, 25. Limiting side plate. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0019] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0020] like Figure 1 , Figure 2 and Figure 3 As shown, an output gear set structure includes a metal output gear 1 and a plastic pulley 2. The metal output gear 1 has a rubber-coated end 11, and a plurality of limiting protrusions 12 are arranged at intervals on the edge of the rubber-coated end 11. The rubber-coated end 11 is provided with limiting holes 13 at the position corresponding to each limiting protrusion 12. The middle part of the plastic pulley 2 has a sleeve hole 21, and the side wall of the sleeve hole 21 is provided with an annular limiting groove 22. The rubber-coated end 11 penetrates into the plastic pulley 2 from the sleeve hole 21, and the limiting protrusion 12 of the rubber-coated end 11 is embedded in the annular limiting groove 22 and fixed. The metal output gear 1 is an integrated structure formed by casting and sintering of metal powder, and the plastic pulley 2 has a limiting structure connected and fixed to the metal output gear. The plastic pulley is connected to the transmission belt, and the transmission belt is connected to the drive.
[0021] Preferably, a plurality of side grooves are provided at intervals on the side wall of the annular limiting groove 22, and the number of the side grooves is the same as the number of the limiting protrusions 12, and each limiting protrusion 12 is embedded in a side groove. The annular limiting groove 22 can be wrapped around the rubber-coated end 11 of the metal output gear 1, and can be fixedly connected through the limiting protrusion 12, the limiting column and the limiting hole to limit the relative movement of the metal gear and the plastic pulley.
[0022] Preferably, the annular limiting groove 22 has a bottom and a top, and a plurality of limiting columns 23 are arranged at intervals at the bottom of the annular limiting groove 22. The limiting columns 23 correspond one-to-one to the limiting holes 13. When the plastic pulley 2 is wrapped around the rubber-coated end 11, the limiting columns 23 are inserted into the limiting holes 13.
[0023] Preferably, the end of the limiting column 23 extends all the way to the top of the annular limiting groove 22 , and the edge of the rubber-coated end 11 is embedded between the limiting column 23 and the top of the annular limiting groove 22 .
[0024] Preferably, teeth grooves 24 are provided at intervals on the outer edge profile of the plastic belt wheel 2 , and position limiting side plates 25 are provided on the side surfaces of the plastic belt wheel 2 at positions corresponding to the teeth grooves 24 .
[0025] Preferably, the metal output gear 1 is further provided with an axial hole 14, and the cross section of the axial hole 14 is D-shaped. The axial hole 14 is used to plug the output shaft, and the plug-in end of the output shaft is arranged in a D shape, which cooperates with the D-shaped axial hole, and does not need to be fixedly connected with a key or pin.
[0026] Preferably, the metal output gear 1 further has a hollow section 15 and a gear section 16. The hollow section 15 has an axial middle hole 17. The middle hole 17 has a plurality of hollow holes 18 at intervals around the circumference. The middle hole 17 is connected to the shaft hole 14. The hollow design inside the hollow section 15 can reduce weight.
[0027] Preferably, the hollow section 15 is located between the gear section 16 and the rubber-coated end 11 , and the shaft hole 14 is arranged in the gear section 16 .
[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and structures of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An output gear set structure, comprising a metal output gear and a plastic pulley, characterized in that: The metal output gear has a rubber-coated end, and a plurality of limiting protrusions are arranged at intervals on the edge of the rubber-coated end. The rubber-coated end is provided with limiting holes corresponding to the position of each limiting protrusion. The middle part of the plastic pulley has a sleeve hole, and the side wall of the sleeve hole is provided with an annular limiting groove. The rubber-coated end is inserted into the plastic pulley from the sleeve hole, and the limiting protrusion of the rubber-coated end is embedded in the annular limiting groove and fixed.
2. The output gear set structure according to claim 1, characterized in that: A plurality of side grooves are arranged at intervals on the side wall of the annular limiting groove, the number of the side grooves is the same as the number of the limiting protrusions, and each of the limiting protrusions is embedded in one of the side grooves.
3. The output gear set structure according to claim 2, characterized in that: The annular limiting groove has a bottom and a top, and a plurality of limiting columns are arranged at intervals at the bottom of the annular limiting groove. The limiting columns correspond to the limiting holes one by one, and when the plastic pulley is wrapped around the rubber-coated end, the limiting columns are inserted into the limiting holes.
4. The output gear set structure according to claim 3, characterized in that: The end of the limiting column extends all the way to the top of the annular limiting groove, and the edge of the rubber-coated end is embedded between the limiting column and the top of the annular limiting groove.
5. The output gear set structure according to claim 1, characterized in that: Tooth grooves are arranged at intervals on the outer edge contour of the plastic belt wheel, and position limiting side plates are arranged at positions corresponding to the tooth grooves on the side surfaces of the plastic belt wheel.
6. The output gear set structure according to claim 1, characterized in that: The metal output gear is also provided with an axial hole, and the cross section of the axial hole is D-shaped.
7. The output gear set structure according to claim 6, characterized in that: The metal output gear also has a hollow section and a gear section. The hollow section has a middle hole in the axial direction. A plurality of hollow holes are arranged at intervals on the circumference of the middle hole. The middle hole is connected to the shaft hole.
8. The output gear set structure according to claim 7, characterized in that: The hollow section is located between the gear section and the rubber-coated end, and the shaft hole is arranged in the gear section.