Split type gear shaft

Abstract

The utility model provides a split type gear shaft, and belongs to the technical field of machinery. The problem that an existing gear shaft is not stable in structure is solved. The split type gear shaft comprises a gear and a shaft body arranged below the gear, a barrel-shaped connecting part is formed on the bottom wall of the gear, a connecting column is arranged at the upper end of the shaft body and inserted into the connecting part, the connecting column and the connecting part are connected in a matched mode through a spline, a circle of through holes are formed in the side wall of the connecting part in a radial penetrating mode, and a first threaded hole is formed in the connecting column in the radial direction. The number of the first threaded holes is the same as that of the through holes, a bolt is arranged in each through hole, the rod portion of each bolt is screwed into the corresponding first threaded hole, and a positioning column is further formed on the bottom wall of the gear and located in the connecting portion. An inserting hole is vertically formed in the top wall of the connecting column, the positioning column is inserted into the inserting hole, the first threaded holes are in a penetrating shape, second threaded holes are formed in the side wall of the positioning column, the second threaded holes and the first threaded holes are the same in number and correspond in position in a one-to-one mode, and the rod portion of the bolt is further screwed into the corresponding second threaded holes. The split type gear shaft is stable in structure.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical technology and relates to a gear shaft, particularly a split gear shaft. Background Technology

[0002] A gear shaft is a mechanical part that supports rotating parts and rotates with them to transmit motion, torque, or bending moment. It is generally a round metal rod, and each section can have a different diameter. The rotating parts in a machine are mounted on the shaft.

[0003] Existing gear shaft structures, such as the high coaxiality gear shaft disclosed in the Chinese Patent Database (application number: 202421886610.1), include a gear body, a fixed cylinder fixedly connected to one outer wall of the gear body, a limiting block fixedly connected to the inner wall of the fixed cylinder, a shaft body inserted inside the fixed cylinder, a limiting groove formed on the outer wall of the shaft body facing the limiting block, the limiting block engaging inside the limiting groove, and bolts threaded through both sides of the fixed cylinder and threadedly connected to the shaft body.

[0004] In the aforementioned gear shaft, the shaft body is connected to the gear body by bolts passing through the fixed cylinder. Since the bolts are only threaded to the shaft body, when the bolts make slight axial movements, the shaft body and the gear body will become loose, affecting the operation of the gear shaft. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a structurally stable split gear shaft.

[0006] The objective of this utility model can be achieved through the following technical solution: A split gear shaft includes a gear and a shaft body disposed below the gear, with the shaft body and gear coaxially arranged. A cylindrical connecting part coaxial with the gear is formed on the bottom wall of the gear. The upper end of the shaft body is a connecting post that matches the inner hole of the connecting part. The connecting post is inserted into the connecting part, and the two are connected by a spline fit. A ring of through holes is radially penetrating the side wall of the connecting part. A threaded hole is radially provided on the connecting post. The number of threaded holes and through holes are the same, and their positions correspond one-to-one. Each through hole... Each part is equipped with bolts, and the bolt shank is screwed into the corresponding threaded hole one. The characteristic is that a positioning post is also formed on the bottom wall of the gear, the positioning post and the gear are coaxially arranged, and the positioning post is located inside the connecting part; the top wall of the connecting post is vertically provided with an insertion hole, the positioning post is inserted into the insertion hole, and the inner and outer walls of the connecting post are in contact with the positioning post and the connecting part respectively; the aforementioned threaded hole one is through-hole, and the side wall of the positioning post is provided with threaded hole two, the number of threaded hole two and threaded hole one are the same and their positions correspond one-to-one, and the shank of the aforementioned bolt is also screwed into the corresponding threaded hole two.

[0007] One ring of threaded hole 2 and one ring of threaded hole 1 are respectively set on the positioning post and the connecting post. When the same bolt is screwed into the corresponding threaded hole 1 and threaded hole 2, the positioning post and the connecting post tend to move towards each other, thus fitting together more tightly to form a self-locking mechanism, effectively reducing the probability of loosening and improving the overall structural stability of the split gear shaft.

[0008] In the aforementioned split-type gear shaft, the axial length of the insertion hole is greater than the axial length of the positioning pin, and there is a gap between the bottom wall of the insertion hole and the bottom wall of the positioning pin. This gap not only accelerates heat dissipation but also distributes the load, reduces stress concentration, and further enhances the structural stability of the gear shaft.

[0009] In the aforementioned split gear shaft, the connecting part is provided with a limiting structure to restrict the upward movement distance of the connecting column, so that the shaft can be moved into place in one go, which is convenient for assembly.

[0010] In the aforementioned split-type gear shaft, the outer surface of the positioning post is a tapered surface one with a diameter that gradually decreases from top to bottom. The limiting structure consists of tapered surface one and tapered surface two, which is formed on the inner wall of the connecting post and matches tapered surface one. Tapered surface one is tightly attached to tapered surface two. The connecting post and the positioning post are engaged through tapered surface contact, which not only enhances the coaxiality of their connection and improves the transmission accuracy of the gear shaft, but also increases their contact area, making the connection between the shaft and the gear more stable and further improving the structural stability of the gear shaft.

[0011] As another option, in the aforementioned split gear shaft, the limiting structure includes a shoulder surface formed on the outer wall of the positioning post and in an annular shape, and the top surface of the connecting post presses against the shoulder surface.

[0012] In the aforementioned split gear shaft, the gear is a single cast component.

[0013] Compared with existing technologies, this split gear shaft has the following advantages:

[0014] 1. A second threaded hole and a first threaded hole are respectively set on the positioning post and the connecting post. When the same bolt is screwed into the corresponding threaded hole one and threaded hole two, the positioning post and the connecting post tend to move towards each other, thus fitting together more tightly to form a self-locking mechanism, effectively reducing the probability of loosening and improving the overall structural stability of the split gear shaft.

[0015] 2. The connecting column and the positioning column are fitted with a tapered surface, which can enhance the coaxiality of the connection between the two and improve the transmission accuracy of the gear shaft. It can also increase the contact area between the two, making the connection between the shaft and the gear more stable and further improving the structural stability of the gear shaft. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the split gear shaft.

[0017] Figure 2 This is a cross-sectional schematic diagram of the split gear shaft.

[0018] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0019] In the diagram, 1 is a gear; 1a is a connecting part; 1b is a through hole; 1c is a positioning pin; 1d is a second conical surface; 1e is a keyway; 2 is a shaft; 2a is a connecting pin; 2b is a socket; 2c is a first conical surface; and 3 is a bolt. Detailed Implementation

[0020] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0021] Example 1: This split gear shaft includes a gear 1 and a shaft 2 disposed below the gear 1, and the shaft 2 and the gear 1 are coaxially arranged.

[0022] Among them, gear 1 is a one-piece structure, and preferably gear 1 is a cast one-piece part. For example Figure 1 and Figure 2 As shown, a cylindrical connecting part 1a is formed on the bottom wall of gear 1 and is coaxial with gear 1.

[0023] The upper end of the shaft 2 is a connecting post 2a that matches the inner hole of the connecting part 1a. The connecting post 2a is inserted into the connecting part 1a and the two are connected by a spline fit. Specifically, a ring of key blocks is formed on the outer wall of the connecting post 2a, evenly distributed around its circumference, and the length of the key blocks extends axially along the connecting post 2a. The inner wall of the connecting cylinder has a keyway 1e that matches the key blocks, and the lower end of the keyway 1e is open. The number of keyways 1e and key blocks is the same and their positions correspond one-to-one. The key blocks are inserted into the corresponding keyways 1e, so that a stable circumferential fit is formed between the connecting post 2a and the connecting part 1a.

[0024] To further explain, a ring of through holes 1b is radially penetrating the side wall of the connecting part 1a, and the ring of through holes 1b is evenly distributed along the circumference of the connecting part 1a. A threaded hole 1 is radially provided on the connecting post 2a. The number of threaded holes 1 and through holes 1b are the same, and their positions correspond one-to-one. Each through hole 1b contains a bolt 3, and the shank of the bolt 3 is screwed into the corresponding threaded hole 1. Preferably, the through hole 1b is a stepped hole, with the head of the bolt 3 completely inside the through hole 1b and pressed against the inner wall of the through hole 1b.

[0025] like Figure 2 and Figure 3As shown, a positioning post 1c is also formed on the bottom wall of gear 1. The positioning post 1c is coaxial with gear 1 and is located inside the connecting part 1a. A vertical insertion hole 2b is provided on the top wall of the connecting post 2a, and the insertion hole 2b is coaxial with the connecting post 2a. The positioning post 1c is inserted into the insertion hole 2b, and the inner and outer walls of the connecting post 2a respectively contact and engage with the positioning post 1c and the connecting part 1a. The aforementioned threaded hole one is through-hole, and a threaded hole two is provided on the side wall of the positioning post 1c. The number of threaded holes two and threaded holes one are the same and their positions correspond one-to-one. The shank of the bolt 3 is also screwed into the corresponding threaded hole two. Preferably, the outer wall of the connecting post 2a and the inner wall of the connecting part 1a are in contact and engage through a circumferential surface.

[0026] A second threaded hole and a first threaded hole are respectively provided on the positioning post 1c and the connecting post 2a. When the same bolt 3 is screwed into the corresponding threaded hole 1 and threaded hole 2, the positioning post 1c and the connecting post 2a tend to move towards each other, thus fitting together more tightly to form a self-locking mechanism, effectively reducing the probability of loosening and improving the overall structural stability of the split gear 1 shaft.

[0027] In the actual product, the axial length of the insertion hole 2b is greater than the axial length of the positioning post 1c, and there is a gap between the bottom wall of the insertion hole 2b and the bottom wall of the positioning post 1c. The gap can accelerate heat dissipation, distribute the load, reduce stress concentration, and further enhance the structural stability of gear 1 shaft.

[0028] To further explain, such as Figure 2 and Figure 3 As shown, the connecting part 1a is provided with a limiting structure to restrict the upward movement distance of the connecting post 2a, so that the shaft 2 can be moved into place in one go, facilitating assembly. Specifically, the outer surface of the positioning post 1c is a conical surface 2c whose diameter gradually decreases from top to bottom. The aforementioned limiting structure consists of conical surface 2c and a second conical surface 1d formed on the inner wall of the connecting post 2a and matching conical surface 2c, with conical surface 2c tightly attached to conical surface 1d. The connecting post 2a and the positioning post 1c are engaged through conical surface contact, which not only enhances the coaxiality of their connection and improves the transmission accuracy of gear 1 shaft, but also increases their contact area, making the connection between shaft 2 and gear 1 more stable and further improving the structural stability of gear 1 shaft.

[0029] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1. The difference is that the limiting structure includes a shoulder surface formed on the outer wall of the positioning post 1c and is in the shape of an annular shape, and the top surface of the connecting post 2a presses against the shoulder surface.

[0030] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A split gear shaft, comprising a gear (1) and a shaft body (2) disposed below the gear (1), wherein the shaft body (2) and the gear (1) are coaxially arranged, a cylindrical connecting part (1a) is formed on the bottom wall of the gear (1) and is coaxial with the gear (1), the upper end of the shaft body (2) is a connecting post (2a) that matches the inner hole of the connecting part (1a), the connecting post (2a) is inserted into the connecting part (1a) and the two are connected by spline engagement, a ring of through holes (1b) is radially penetrating on the side wall of the connecting part (1a), a threaded hole is radially provided on the connecting post (2a), the number of threaded holes and through holes (1b) are the same and their positions correspond one-to-one, a bolt (3) is provided in each through hole (1b), and the shank of the bolt (3) is screwed into the corresponding threaded hole, characterized in that, A positioning post (1c) is also formed on the bottom wall of the gear (1). The positioning post (1c) and the gear (1) are coaxially arranged, and the positioning post (1c) is located inside the connecting part (1a). A vertical insertion hole (2b) is provided on the top wall of the connecting post (2a). The positioning post (1c) is inserted into the insertion hole (2b), and the inner and outer walls of the connecting post (2a) are in contact with the positioning post (1c) and the connecting part (1a) respectively. The threaded hole one is through-hole, and a threaded hole two is provided on the side wall of the positioning post (1c). The number of threaded holes two and threaded holes one are the same and their positions correspond one to one. The shank of the bolt (3) is also screwed into the corresponding threaded hole two.

2. The split gear shaft according to claim 1, characterized in that, The axial length of the insertion hole (2b) is greater than the axial length of the positioning post (1c), and there is a gap between the bottom wall of the insertion hole (2b) and the bottom wall of the positioning post (1c).

3. The split gear shaft according to claim 2, characterized in that, The connecting part (1a) is provided with a limiting structure for limiting the upward movement distance of the connecting post (2a).

4. The split gear shaft according to claim 3, characterized in that, The outer side of the positioning post (1c) is a cone surface one (2c) whose diameter gradually decreases from top to bottom. The limiting structure is a cone surface one (2c) and a cone surface two (1d) formed on the inner wall of the connecting post (2a) and matching the cone surface one (2c). The cone surface one (2c) is attached to the cone surface two (1d).

5. The split gear shaft according to claim 3, characterized in that, The limiting structure includes an annular shoulder surface formed on the outer wall of the positioning post (1c), and the top surface of the connecting post (2a) presses against the shoulder surface.

6. The split gear shaft according to claim 1, characterized in that, The gear (1) is a cast integral part.

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