Bevel gear structure

Abstract

The utility model provides a bevel gear structure and belongs to the technical field of machinery. The problem that an existing bevel gear is poor in transmission precision is solved. The bevel gear structure comprises a bevel gear and a gear shaft which are coaxially arranged, a connecting column is integrally formed on the bottom wall of the bevel gear, a conical hole with the hole diameter gradually increasing from top to bottom is formed in the bottom wall of the connecting column, and the connecting column, the conical hole and the bevel gear are coaxially arranged; a circular-truncated-cone-shaped connecting part matched with the conical hole is integrally formed at the top of the gear shaft, and the connecting part is inserted into the conical hole; an annular groove coaxial with the bevel gear is formed among the connecting part, the bottom wall of the connecting column and the top wall of the gear shaft, and the annular groove is filled with welding fluid so that the connecting column and the gear shaft can form a whole. The bevel gear structure is high in transmission precision.

Description

Technical Field

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

[0002] Spiral bevel gears have a circular arc shape in their tooth profile, and they are generally conical, resembling an umbrella, hence the name spiral bevel gears. Spiral bevel gears are a type of transmission component that can smoothly transmit power at a stable transmission ratio with low noise. They have different names in different regions, such as spiral bevel gears, arc tooth bevel gears, arc tooth bevel gears, circular arc bevel gears, and spiral bevel gears.

[0003] Existing bevel gear structures, such as the low-noise automotive rear axle active bevel gear disclosed in the Chinese Patent Database (application number: 201921839068.3), include an active bevel gear. The active bevel gear has a threaded groove at its top, and a threaded rod is threadedly connected to the top of the threaded groove. A fixing rod is fixedly installed at the bottom of the active bevel gear, and a mesh-patterned fixing sleeve is fixedly installed on the fixing rod. A fixing shaft is provided on the left side of the active bevel gear, and a connecting shaft is fixedly installed on the fixing shaft. A driven bevel gear disk is fixedly installed on the outside of the connecting shaft, and one side of the driven bevel gear disk meshes with one side of the active bevel gear.

[0004] In the aforementioned bevel gears, the fixed rod and the driving bevel gear are fixed in direct surface contact. This type of assembly is prone to coaxiality deviation, which can compromise transmission accuracy and stability. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a bevel gear structure with high coaxiality.

[0006] The objective of this utility model can be achieved through the following technical solution: A bevel gear structure, comprising a bevel gear and a gear shaft arranged coaxially, characterized in that a connecting post is integrally formed on the bottom wall of the bevel gear, and a conical hole with a diameter gradually increasing from top to bottom is opened on the bottom wall of the connecting post, and the connecting post, the conical hole and the bevel gear are arranged coaxially; a connecting part in the shape of a frustum matching the conical hole is integrally formed on the top of the gear shaft, and the connecting part is inserted into the conical hole; an annular groove coaxial with the bevel gear is formed between the connecting part, the bottom wall of the connecting post and the top wall of the gear shaft, and the annular groove is filled with welding liquid to make the connecting post and the gear shaft form a whole.

[0007] The frustum-shaped connecting part is inserted into the conical hole so that the outer side of the connecting part is in close contact with the inner wall of the conical hole, thereby forcibly correcting the relative position of the bevel gear and the gear shaft, so that the two maintain a high degree of coaxiality and improve the overall transmission accuracy of the bevel gear.

[0008] In the aforementioned bevel gear structure, the upper end of the gear shaft and the connecting post are fitted with the same positioning sleeve, and the outer wall of the upper end of the gear shaft and the outer wall of the connecting post are in close contact with the inner wall of the positioning sleeve. The positioning sleeve not only conceals the welding location but also increases the connection methods between the gear shaft and the connecting post, further enhancing the connection strength and making the bevel gear structure more stable.

[0009] In the aforementioned bevel gear structure, an annular step coaxial with the bevel gear is formed between the connecting post and the bevel gear, and the outer side of the connecting post and the bottom surface of the bevel gear are the side and bottom surfaces of the annular step, respectively. The top surface of the positioning sleeve presses against the bottom surface of the bevel gear so that the positioning sleeve is pressed into place in one go, which facilitates assembly.

[0010] In the aforementioned bevel gear structure, the bottom surface of the connecting post is a tapered guide surface, and the diameter of the guide surface gradually decreases from top to bottom. The guide surface is designed to guide the welding slurry towards the inner side of the annular groove, allowing the welding slurry to fill the annular groove more evenly and enhancing the connection strength and stability between the connecting post and the bevel gear.

[0011] In the aforementioned bevel gear structure, the lower end of the gear shaft is provided with an external thread to facilitate the installation and positioning of the bevel gear.

[0012] Compared with existing technologies, this bevel gear structure has the following advantages:

[0013] 1. The frustum-shaped connecting part is inserted into the conical hole so that the outer side of the connecting part is in close contact with the inner wall of the conical hole, thereby forcibly correcting the relative position of the bevel gear and the gear shaft, so that the two maintain a high degree of coaxiality and improve the overall transmission accuracy of the bevel gear.

[0014] 2. The positioning sleeve is set up, which can not only hide the welding position, but also increase the connection between the gear shaft and the connecting column, so as to further enhance the connection strength between the gear shaft and the connecting column and make the bevel gear structure more stable. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the bevel gear structure.

[0016] Figure 2 This is a cross-sectional schematic diagram of the bevel gear structure.

[0017] Figure 3 This is a schematic diagram of the annular groove.

[0018] Figure 4 This is a schematic diagram of the bevel gear.

[0019] In the figure, 1 is a bevel gear; 1a is a connecting post; 1a1 is an inlet surface; 1b is a conical hole; 1c is an annular step; 2 is a gear shaft; 2a is a helical gear; 2b is an external thread; 2c is a connecting part; 3 is an annular groove; and 4 is a positioning sleeve. 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] like Figure 1 As shown, this bevel gear structure includes a bevel gear 1 and a gear shaft 2 arranged coaxially, with the bevel gear 1 located above the gear shaft 2.

[0022] in,

[0023] A connecting post 1a is integrally formed on the bottom wall of the bevel gear 1, and the connecting post 1a and the bevel gear 1 are coaxially arranged. A conical hole 1b with a diameter that gradually increases from top to bottom is opened on the bottom wall of the connecting post 1a, and the conical hole 1b and the bevel gear 1 are coaxially arranged.

[0024] The gear shaft 2 is a one-piece structure. The upper end of the gear shaft 2 is a cylinder, the middle part of the gear shaft 2 is provided with a helical gear 2a, and the lower end of the gear shaft 2 is provided with an external thread 2b.

[0025] like Figure 2 and Figure 3 As shown, the top of the gear shaft 2 is integrally formed with a frustum-shaped connecting portion 2c that matches the conical bore 1b. Specifically, the outer diameter of the connecting portion 2c gradually increases from top to bottom. The connecting portion 2c is inserted into the conical bore 1b, and its outer surface is in close contact with the inner surface of the conical bore 1b. An annular groove 3, coaxial with the bevel gear 1, is formed between the connecting portion 2c, the bottom wall of the connecting post 1a, and the top wall of the gear shaft 2. This annular groove 3 is filled with welding flux to make the connecting post 1a and the gear shaft 2 a single unit.

[0026] The frustum-shaped connecting part 2c is inserted into the conical hole 1b so that the outer side of the connecting part 2c is in close contact with the inner wall of the conical hole 1b, thereby forcibly correcting the relative position of the bevel gear 1 and the gear shaft 2, so that the two maintain a high degree of coaxiality and improve the overall transmission accuracy of the bevel gear.

[0027] Preferably, the top surface of the connecting part 2c presses against the bottom surface of the conical hole 1b to increase the contact area between the connecting part 2c and the connecting post 1a, making the connection between the two more stable.

[0028] like Figure 2 and Figure 4As shown, the upper end of the gear shaft 2 and the connecting post 1a are fitted with the same positioning sleeve 4, and the outer wall of the upper end of the gear shaft 2 and the outer wall of the connecting post 1a are in close contact with the inner wall of the positioning sleeve 4. The positioning sleeve 4 not only conceals the welding position but also increases the connection methods between the gear shaft 2 and the connecting post 1a, further enhancing the connection strength and making the bevel gear structure more stable. Further explanation: the outer diameter of the connecting post 1a is smaller than the outer diameter of the bottom surface of the bevel gear 1, so that an annular step 1c coaxial with the bevel gear 1 is formed between the connecting post 1a and the bevel gear 1. The outer surface of the connecting post 1a and the bottom surface of the bevel gear 1 are the side surface and bottom surface of the annular step 1c, respectively. The top surface of the positioning sleeve 4 presses against the bottom surface of the bevel gear 1, allowing the positioning sleeve 4 to be pressed into place in one go, facilitating assembly.

[0029] In the actual product, the bottom surface of the connecting column 1a is a conical guide surface 1a1, and the diameter of the guide surface 1a1 gradually decreases from top to bottom. The guide surface 1a1 is set to guide the welding liquid to move into the inner side of the annular groove 3, so that the welding liquid fills the annular groove 3 more evenly, and strengthens the connection strength and stability between the connecting column 1a and the bevel gear 1.

[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 bevel gear structure comprising a bevel gear (1) and a pinion (2) arranged coaxially, characterized in that, The bottom wall of the bevel gear (1) is integrally formed with a connecting column (1a), the bottom wall of the connecting column (1a) is provided with a conical hole (1b) with a gradually increasing diameter from top to bottom, and the connecting column (1a), the conical hole (1b) and the bevel gear (1) are coaxially arranged; the top of the pinion shaft (2) is integrally formed with a connecting part (2c) matched with the conical hole (1b) and in the shape of a circular truncated cone, the connecting part (2c) is inserted into the conical hole (1b); the connecting part (2c), the bottom wall of the connecting column (1a) and the top wall of the pinion shaft (2) form an annular groove (3) coaxial with the bevel gear (1), and the annular groove (3) is filled with welding liquid to make the connecting column (1a) and the pinion shaft (2) form an integral whole.

2. The umbrella-tooth structure of claim 1, wherein, The upper end of the pinion shaft (2) and the connecting column (1a) are sleeved with the same positioning sleeve (4), and the outer side wall of the upper end of the pinion shaft (2) and the outer side wall of the connecting column (1a) are in close contact with the inner wall of the positioning sleeve (4).

3. The umbrella-tooth structure of claim 2, wherein, The connecting column (1a) and the bevel gear (1) form an annular step (1c) coaxial with the bevel gear (1), and the outer side of the connecting column (1a) and the bottom surface of the bevel gear (1) are the side and bottom of the annular step (1c) respectively, and the top surface of the above-mentioned positioning sleeve (4) is pressed on the bottom surface of the bevel gear (1).

4. The umbrella-tooth structure of claim 1, wherein The bottom surface of the connecting column (1a) is a tapered lead-in surface (1a1), and the diameter of the lead-in surface (1a1) gradually decreases from top to bottom.

5. The umbrella-tooth structure of claim 1, wherein The lower end of the pinion shaft (2) is provided with external threads (2b).

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