Combined gear and gear transmission device applying same

Abstract

The invention relates to the technical field of gears, in particular to a combined gear which comprises a first notched tooth and a second notched tooth which are mutually coupled, the first notched tooth and the second notched tooth are each provided with a disc-shaped main body part, and a connecting shaft through hole is axially formed in the middle of each main body part; a notch part penetrating to the connecting shaft through hole is formed in the side part of the main body part, a filling part matched with the notch part is formed in the position, axially symmetrical to the notch part, of the main body part in the normal direction, and half tooth structures which are evenly distributed are formed on the outer side of the main body part; in the operation process of the gear, the wedging structure of the filling part and the notch part can effectively disperse acting force generated during transmission, stress is prevented from being concentrated on local connecting points, the possibility of loss and loosening of the connecting structure is greatly reduced, the stability and reliability of the whole gear structure in the operation process are remarkably improved, and the service life of the gear is prolonged. And continuous and stable operation of a mechanical transmission system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of gears, and in particular to a combined gear and a gear transmission device using the same. Background Art

[0002] In the field of mechanical transmission, gears, as core components, play a crucial role in transmitting power and motion. Currently, the mainstream gears on the market are mostly of an integral structure. When assembling this type of integral gear, it can only be connected to the shaft from the end of the shaft and cannot be directly installed in the middle of the shaft, which greatly limits its application in some specific mechanical structures. For example, in some complex mechanical systems, gears need to be set at the middle position of the shaft to achieve specific transmission paths and functions, but the structural characteristics of the integral gear make it unable to meet this requirement. To solve the above problems, the prior art designs gears as two-piece structures. For example, in the invention patent "A semi-circular combined gear for easy disassembly and assembly" with the authorization announcement number CN217381506U, the connection is achieved by inserting convex blocks into grooves, cylinders into slots, then rotating a bidirectional threaded rod to adjust the distance between sliders, using clamping plates to clamp the convex blocks, and cooperating with inserting limit blocks into limit grooves. Another example is the invention patent "An assembled gear" with the authorization announcement number CN219796005U, which successfully realizes the disassembly and assembly of gears and can replace damaged parts separately, reducing the replacement cost. However, such two-piece gear structures have obvious defects. Due to the limited butt joint surfaces and connection structures of the two gears, during the operation of the gears, the connection structure needs to bear extremely large forces. Being in this high-load state for a long time, the connection structure is extremely prone to wear and loosening. Once the connection structure is damaged, it will not only affect the stability and accuracy of gear transmission, but may even lead to the failure of the entire mechanical transmission system, resulting in production stagnation and economic losses. In response to the problem of easy damage to the connection structure of two-piece gears, the prior art has also proposed some solutions. For example, in "A movable tooth sprocket structure" with the authorization announcement number CN209511061U, it consists of a hub, spokes, and teeth. The spokes are integrally connected to the hub, and the hub and spokes are surrounded by two symmetrical halves and fixed at the splicing point through an outward-expanded hub flange and hub bolts. This structure increases the contact area of the spoke connection through a special hub design and improves the connection stability to a certain extent. However, the disadvantages of this structure are also obvious. It causes a significant increase in the overall size. In practical application scenarios with strict requirements for space layout, such a large-sized structure is difficult to exert its advantages and may even cause new installation and adaptation problems and cannot meet the installation requirements in a compact space; In summary, the existing gear structures have deficiencies in terms of installation convenience, connection stability, and space adaptability, and there is an urgent need for a new gear structure to solve these problems to meet the increasingly complex and diverse mechanical transmission requirements. Summary of the Invention

[0003] The present invention aims to provide a technical solution to solve the above problems in order to overcome the above deficiencies.

[0004] A combined gear includes a first notched tooth and a second notched tooth that are coupled to each other. Both the first notched tooth and the second notched tooth have a disc-shaped main body portion. An axial through hole for the shaft is provided in the middle of the main body portion. A notch portion penetrating through to the axial through hole is provided on the side portion of the main body portion. And at a position axially symmetric to the notch portion on the main body portion, a filling portion matching the notch portion is formed normally. Uniformly distributed semi-tooth structures are formed on the outer side of the main body portion. And the semi-tooth structures at the position corresponding to the filling portion on the main body portion extend along the filling portion to form a complete tooth structure. The first notched tooth and the second notched tooth are axially butted and coupled to each other through the cooperation of the filling portion and the notch portion. On the butting surfaces of the first notched tooth and the second notched tooth, a plurality of uniformly distributed connection holes are correspondingly provided. The first notched tooth and the second notched tooth are screwed together through the connection holes.

[0005] Preferably, the semi-tooth structures on the first notched tooth and the second notched tooth are divided into two groups with staggered distribution. Among them, a jack hole is normally provided on one group of semi-tooth structures, and a pin matching the jack hole is formed normally on the other group of semi-tooth structures. After the first notched tooth and the second notched tooth are combined, the opposite semi-tooth structures are cooperated through the docking of the pin and the jack hole.

[0006] Preferably, the connection holes have countersunk holes and threaded holes. The countersunk holes and the threaded holes are arranged in a staggered manner. And after the first notched tooth and the second notched tooth are combined, the threaded hole of the first notched tooth corresponds to the countersunk hole of the second notched tooth, and the countersunk hole of the first notched tooth corresponds to the threaded hole of the second notched tooth.

[0007] Preferably, at least one convex portion is formed on the main body portion of the first notched tooth, and at least one concave portion matching the convex portion is provided on the main body portion of the second notched tooth. After the first notched tooth and the second notched tooth are combined, the convex portion and the concave portion are butted and cooperated with each other.

[0008] Preferably, both the convex portion and the concave portion are arc-shaped structures, and the center of the circle corresponding to the arc-shaped structure coincides with the axis of the main body portion.

[0009] Preferably, on the first notched tooth, a convex portion is formed between every two adjacent connection holes. On the second notched tooth, a concave portion is formed between every two adjacent connection holes.

[0010] Preferably, both the first notched tooth and the second notched tooth have a complete tooth structure, and the complete tooth structure is centrally distributed outside the filling portion.

[0011] Preferably, both the notch portion and the filling portion are enlarged so that the position of the filling portion corresponding to the connection through hole can be thickened.

[0012] A gear transmission device includes a combined gear as described above, wherein the inner sides of the connecting shaft through holes corresponding to the first notched teeth and the second notched teeth are both provided with first flat key grooves, and also includes a power output shaft, on which two second flat key grooves are provided, the combined gear is assembled on the power output shaft, and the combined gear and the power output shaft are key-connected via the first flat key groove and the second flat key groove.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By innovatively setting the gears to have a first notch tooth and a second notch tooth that are axially docked, mutual coupling is achieved with the help of the precise matching of the filling part and the notch part; this coupling method is different from the simple docking of traditional two-petal gears, and it enables the two components to form a tighter and more stable connection after splicing; during the operation of the gears, the fitting structure of the filling part and the notch part can effectively disperse the force generated during transmission, avoid stress concentration at local connection points, greatly reduce the possibility of wear and loosening of the connection structure, significantly improve the stability and reliability of the entire gear structure during operation, and ensure the continuous and stable operation of the mechanical transmission system.

[0014] The use of the filling portion and the notch portion makes the first notch tooth and the second notch tooth present an arc-shaped structure as a whole. When combined, the overlapping area of ​​the two is greatly increased, which provides favorable conditions for the setting of the connecting holes. Compared with the limited docking surface of the traditional two-petal gear, it is difficult to arrange enough connection points. The present design can evenly open multiple connection holes on a larger contact surface. The connection strength between the first notch tooth and the second notch tooth is greatly enhanced by tightening through the screws through these connection holes. The uniform distribution of multiple connection points makes the connection force more balanced, further improving the overall fatigue resistance of the gear, so that it can still maintain a good connection state when subjected to high loads and long-term operation, reducing the occurrence rate of failures caused by loose connections.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a structural schematic diagram of the combined gear in the present invention; Figure 2It is a schematic structural view of the first notched tooth in the present invention; Figure 3 It is a schematic structural view of the second notched tooth in the present invention; Figure 4 It is a schematic structural view of the gear transmission device in the present invention; Figure 5 It is a schematic exploded structural view of the gear transmission device in the present invention.

[0018] The reference numerals and names in the figure are as follows: The first notched tooth 10, the second notched tooth 20, the main body 30, the coupling through hole 31, the notch 32, the filling part 33, the semi-tooth structure 34, the jack 341, the plug 342, the integral tooth structure 35, the connection hole 36, the countersunk hole 361, the threaded hole 362, the protrusion 37, the depression 38, the power output shaft 40, the first keyway 41, and the second keyway 42. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-3 , in the embodiment of the present invention, a combined gear includes a mutually coupled first notched tooth 10 and a second notched tooth 20. Both the first notched tooth 10 and the second notched tooth 20 have a disk-shaped main body 30. An axial coupling through hole 31 is formed in the middle of the main body 30. A notch 32 penetrating to the coupling through hole 31 is formed in the side of the main body 30. And a filling part 33 matching the notch 32 is formed normally at a position axially symmetric to the notch 32 on the main body 30. Uniformly distributed semi-tooth structures 34 are formed on the outside of the main body 30. And the semi-tooth structures 34 at the positions corresponding to the filling part 33 on the main body 30 extend along the filling part 33 to form an integral tooth structure 35. The first notched tooth 10 and the second notched tooth 20 are axially butted and mutually coupled through the cooperation of the filling part 33 and the notch 32; A plurality of uniformly distributed connection holes 36 are correspondingly formed on the butting surfaces of the first notched tooth 10 and the second notched tooth 20. The first notched tooth 10 and the second notched tooth 20 are screwed through the connection holes 36.

[0021] In the above technical solution, since both the first notched tooth 10 and the second notched tooth 20 have a disc-shaped main body portion 30, and there is a connecting shaft through hole 31 in the middle of the main body portion 30 for connecting to the shaft; when the two are axially butted, the filling portion 33 on the first notched tooth 10 and the notch portion 32 on the second notched tooth 20 are mutually matched, and the filling portion 33 on the second notched tooth 20 and the notch portion 32 on the first notched tooth 10 are mutually matched to achieve preliminary coupling and positioning; this design enables the two components to fit accurately when butted, providing a basis for subsequent connection; on the butting surfaces of the first notched tooth 10 and the second notched tooth 20, a plurality of uniformly distributed connecting holes 36 are correspondingly opened; by passing screws through these connecting holes 36 and tightening the screws, the first notched tooth 10 and the second notched tooth 20 are tightly connected together to form a complete gear structure.

[0022] Through the above technical solution, different from the traditional integral gear that can only be connected to the shaft from the shaft end, the combined gear can be disassembled into the first notched tooth 10 and the second notched tooth 20; during installation, the two parts can be sleeved onto the shaft from both sides of the shaft respectively and then butted and assembled, realizing the direct installation of the gear in the middle of the shaft, greatly improving the flexibility and convenience of gear installation, and being able to better adapt to the requirements of complex mechanical structure layouts.

[0023] On this basis, by innovatively setting the gear as the axially butted first notched tooth 10 and second notched tooth 20, mutual coupling is achieved through the precise cooperation of the filling portion 33 and the notch portion 32; this coupling method is different from the simple butt joint of traditional two-piece gears, and it enables the two components to form a more compact and stable connection after splicing; during the operation of the gear, the fitting structure of the filling portion 33 and the notch portion 32 can effectively disperse the acting force generated during transmission, avoiding stress concentration at local connection points, greatly reducing the possibility of wear and loosening of the connection structure, and significantly improving the stability and reliability of the entire gear structure during operation, ensuring the continuous and stable operation of the mechanical transmission system.

[0024] This structure in which the filling portion 33 and the notch portion 32 are used in cooperation makes the first notched tooth 10 and the second notched tooth 20 as a whole present an excellent arc shape. During combination, the overlapping area of the two is greatly increased, providing favorable conditions for the setting of the connecting holes 36; compared with the limited butt joint surface of traditional two-piece gears that is difficult to arrange enough connection points, this design can uniformly open a plurality of connecting holes 36 on a larger contact surface; by passing screws through these connecting holes 36 for fastening, the connection strength between the first notched tooth 10 and the second notched tooth 20 is greatly enhanced; and the uniform distribution of multiple connection points makes the connection force more balanced, further improving the anti-fatigue performance of the overall gear, enabling it to still maintain a good connection state when bearing high loads and running for a long time, and reducing the failure rate caused by connection loosening.

[0025] Please refer to Figures 1-3 , based on the above technical solution, it is further proposed that the semi-tooth structures 34 on the first notched tooth 10 and the second notched tooth 20 are divided into two groups with staggered distributions. Among them, a jack 341 is formed normally on one group of semi-tooth structures 34, and a pin 342 that matches the jack 341 is formed normally on the other group of semi-tooth structures 34. After the first notched tooth 10 and the second notched tooth 20 are combined, the opposite semi-tooth structures 34 are matched through the docking of the pin 342 and the jack 341. Through this setting, in terms of connection stability, when the first notched tooth 10 and the second notched tooth 20 are combined, the opposite semi-tooth structures 34 are tightly docked through the pin 342 and the jack 341, adding multiple additional connection points on the basis of the original filling part 33, the notch part 32, and the screw connection. This not only further disperses the acting force during gear operation but also greatly enhances the connection strength between the two parts, effectively reducing the risk of loosening at the connection part. Secondly, from the perspective of transmission accuracy, the precise matching of the pin 342 and the jack 341 can ensure that during gear transmission, the first notched tooth 10 and the second notched tooth 20 always rotate synchronously, reducing the transmission error caused by the small displacement between components, improving the working accuracy of the entire transmission system, and enabling it to operate stably and efficiently in equipment with high requirements for transmission accuracy.

[0026] Please refer to Figures 1-3 , based on the above technical solution, it is further proposed that the connection hole 36 has a countersunk hole 361 and a threaded hole 362, and the countersunk hole 361 and the threaded hole 362 are arranged in a staggered manner. After the first notched tooth 10 and the second notched tooth 20 are combined, the threaded hole 362 of the first notched tooth 10 corresponds to the countersunk hole 361 of the second notched tooth 20, and the countersunk hole 361 of the first notched tooth 10 corresponds to the threaded hole 362 of the second notched tooth 20. Through this setting, in terms of installation convenience, the staggered design of the countersunk hole 361 and the threaded hole 362 facilitates the fastening operation of the screw in a more flexible manner during installation, avoiding the inconvenience caused by the overly concentrated or same-direction screw installation positions. In terms of connection stability, this cross-corresponding design allows the screw to connect the two parts from different angles and positions during fastening, making the connection force distribution of the first notched tooth 10 and the second notched tooth 20 more uniform, greatly enhancing the overall connection firmness, and further reducing the possibility of loosening caused by uneven connection force during operation. At the same time, this ingenious design also optimizes the overall structural layout of the gear to a certain extent, improves the reliability of the gear under complex working conditions, and provides a more solid guarantee for its wide application in various mechanical equipment.

[0027] Please refer to Figures 1-3, on the basis of the above technical solution, it is further proposed that at least one protrusion 37 is formed on the main body 30 of the first notched tooth 10, and at least one recess 38 matching the protrusion 37 is provided on the main body 30 of the second notched tooth 20. After the first notched tooth 10 and the second notched tooth 20 are combined, the protrusion 37 and the recess 38 are butt-jointed and matched with each other; both the protrusion 37 and the recess 38 are arc-shaped structures, and the center of the circle corresponding to the arc-shaped structure coincides with the axis of the main body 30; on the first notched tooth 10, a protrusion 37 is formed between every two adjacent connecting holes 36, and on the second notched tooth 20, a recess 38 is formed between every two adjacent connecting holes 36. Through this setting, in terms of positioning accuracy, when the first notched tooth 10 and the second notched tooth are combined, the protrusion 37 and the recess 38 are butt-jointed and matched with each other, which can achieve preliminary precise positioning before the filling part 33 is coupled with the notch part 32 and the pin 342 is docked with the jack 341, greatly reducing the alignment difficulty during installation and ensuring that the two parts can be assembled quickly and accurately; in terms of connection stability, the protrusion 37 and the recess 38 are tightly fitted, and on the basis of screw connection, an additional circumferential limiting effect is provided to prevent relative rotation of the two parts during operation, and together with the pin 342 and the jack 341, the connection strength is enhanced in all directions, further reducing the possibility of loosening at the connection part; moreover, the protrusion 37 and the recess 38 adopt an arc-shaped structure with the center of the circle coinciding with the axis of the main body 30, which can better adapt to the circumferential movement characteristics of the gear and make the force on each part more uniform; the protrusion 37 and the recess 38 are respectively arranged between every two adjacent connecting holes 36, and this layout makes clever use of space, improves the connection structure without increasing the overall size, and comprehensively improves the performance of the gear, providing a solid guarantee for its stable operation under complex working conditions.

[0028] Please refer to Figures 1-3 , on the basis of the above technical solution, it is further proposed that both the first notched tooth 10 and the second notched tooth 20 have a whole tooth structure 35, so that both sides of the notch part 32 and the filling part 33 are located between two adjacent teeth, and the whole tooth structure 35 is centrally distributed outside the filling part 33, optimizing the tooth distribution of the gear, making the force more balanced during the meshing transmission of the gear, effectively reducing the risk of local wear of the teeth, and improving the overall service life of the gear; both the notch part 32 and the filling part 33 are enlarged so that the position of the filling part 33 corresponding to the connecting through hole can be thickened; the thickened part forms a more reliable support structure around the connecting through hole, which helps to disperse the load transmitted by the shaft and reduce the damage to the connecting through hole and its surrounding area caused by stress concentration, comprehensively improving the stability and reliability of the gear during operation under complex working conditions.

[0029] Please refer to Figures 4-5, in order to further elaborate on the structural features of the present technical solution, the present technical solution further proposes a gear transmission device, including the above-mentioned combined gear. Among them, first flat key grooves 41 are provided on the inner sides of the coupling through holes 31 corresponding to the first notched teeth 10 and the second notched teeth 20. It also includes a power output shaft 40, on which two second flat key grooves 42 are provided. The combined gear is assembled on the power output shaft 40, and a key connection is made between the combined gear and the power output shaft 40 through the first flat key grooves 41 and the second flat key grooves 42; the first flat key grooves 41 on the inner sides of the coupling through holes 31 of the first notched teeth 10 and the second notched teeth 20 are key-connected to the second flat key grooves 42 on the power output shaft 40. This design can ensure efficient and stable torque transmission between the combined gear and the power output shaft 40, effectively avoiding power transmission interruption or slipping caused by loose connection, and greatly improving the accuracy and reliability of power transmission; from the perspective of the overall structural stability, the flat key connection provides reliable limit in the circumferential direction, and together with the connection structure of the combined gear itself, further enhances the installation firmness of the gear on the power output shaft 40, enabling the gear to maintain a stable working state even during high-speed operation and under complex loads, reducing the risk of failures caused by unstable structure, and comprehensively improving the applicability and durability of the gear transmission device in various application scenarios.

[0030] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A combined gear, characterized in that, It includes a first notched tooth (10) and a second notched tooth (20) which are mutually coupled. Both the first notched tooth (10) and the second notched tooth (20) have a disc-shaped main body portion (30). An axial through-hole for the shaft connection (31) is axially formed in the middle of the main body portion (30). A notch portion (32) penetrating through to the axial through-hole for the shaft connection (31) is formed in the side portion of the main body portion (30). And a filling portion (33) matching the notch portion (32) is formed normally at a position axially symmetrical to the notch portion (32) on the main body portion (30). A uniformly distributed semi-tooth structure (34) is formed on the outer side of the main body portion (30). And the semi-tooth structure (34) at the position corresponding to the filling portion (33) on the main body portion (30) extends along the filling portion (33) to form a complete tooth structure (35). The first notched tooth (10) and the second notched tooth (20) are axially butted and mutually coupled through the cooperation of the filling portion (33) and the notch portion (32). On the butting surfaces of the first notched tooth (10) and the second notched tooth (20), a plurality of uniformly distributed connection holes (36) are correspondingly formed. The first notched tooth (10) and the second notched tooth (20) are screwed together through the connection holes (36).

2. The combined gear according to claim 1, characterized in that, The semi-tooth structures (34) on the first notched tooth (10) and the second notched tooth (20) are divided into two groups with staggered distribution. Among them, a jack hole (341) is formed normally on one group of semi-tooth structures (34), and a plug (342) matching the jack hole (341) is formed normally on the other group of semi-tooth structures (34). After the first notched tooth (10) and the second notched tooth (20) are combined, the opposite semi-tooth structures (34) are cooperated through the docking of the plug (342) and the jack hole (341).

3. A combined gear according to claim 1, characterized in that, The connection hole (36) has a countersunk hole (361) and a threaded hole (362). The countersunk hole (361) and the threaded hole (362) are arranged in a staggered manner. And after the first notched tooth (10) and the second notched tooth (20) are combined, the threaded hole (362) of the first notched tooth (10) corresponds to the countersunk hole (361) of the second notched tooth (20), and the countersunk hole (361) of the first notched tooth (10) corresponds to the threaded hole (362) of the second notched tooth (20).

4. A combined gear according to claim 1, characterized in that, At least one convex portion (37) is formed on the main body portion (30) of the first notched tooth (10), and at least one concave portion (38) matching the convex portion (37) is formed in the main body portion (30) of the second notched tooth (20). After the first notched tooth (10) and the second notched tooth (20) are combined, the convex portion (37) and the concave portion (38) are mutually butted and cooperated with each other.

5. A combined gear according to claim 4, characterized in that, Both the convex portion (37) and the concave portion (38) are arc-shaped structures, and the center of the circle corresponding to the arc-shaped structure coincides with the axis of the main body portion (30).

6. A combined gear according to claim 4, characterized in that, On the first notched tooth (10), a convex portion (37) is formed between every two adjacent connection holes (36). On the second notched tooth (20), a concave portion (38) is formed between every two adjacent connection holes (36).

7. A combined gear according to claim 1, characterized in that, Both the first notched tooth (10) and the second notched tooth (20) have a complete tooth structure (35), and the complete tooth structure (35) is centrally distributed outside the filling part (33).

8. A combined gear according to claim 1, characterized in that, Both the notched part (32) and the filling part (33) are enlarged so that the position of the filling part (33) corresponding to the connecting through-hole can be thickened.

9. A gear transmission device, comprising a combined gear according to any one of claims 1-8, characterized in that, A first flat keyway (41) is provided inside the connecting shaft through-holes (31) corresponding to the first notched tooth (10) and the second notched tooth (20). A power output shaft (40) is further included. Two second flat keyways (42) are provided on the power output shaft (40). The combined gear is assembled on the power output shaft (40), and the combined gear and the power output shaft (40) are key-connected through the first flat keyway (41) and the second flat keyway (42).

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