Intermediate frequency quenched gear

Abstract

This utility model belongs to the technical field of gear transmission devices and discloses a medium-frequency quenched gear, including a gear body (1) with a quenching layer on its surface, a shaft hole (2) and gear teeth (3) on the gear body (1); the quenching layer is a graphite quenching layer (4), a convex ring (6) is provided on one side of the graphite quenching layer (4), the convex ring (6) is arranged around the outer edge of the shaft hole (2); a right-angled triangular reinforcing block (5) is provided on one side of the graphite quenching layer (4), the reinforcing block (5) is evenly arranged around the convex ring (6), and the thickness of the reinforcing block (5) is 2-3 times the thickness of the quenching layer; symmetrical weight-reducing holes (7) are provided through the gear body (1), and the weight-reducing holes (7) are circular. The triangular reinforcing blocks and the graphite quenching layer of this utility model work together to significantly improve the bending strength of the gear and increase the service life of the gear, and the symmetrical weight-reducing holes are easy to drill, reducing production costs.

Description

Technical Field

[0001] This utility model belongs to the technical field of gear transmission devices, specifically medium-frequency quenched gears. Background Technology

[0002] The structure of pneumatic drills used in mining typically includes gear assemblies, with power transmission and speed regulation achieved through a gearbox. Mining pneumatic drills need to withstand high-frequency impact loads, resulting in heavy gear loads and making the gear assembly prone to overload damage.

[0003] Reference CN211117442U discloses a powder metallurgy gear, including a gear body, a shaft hole, and at least two weight-reducing cavities. The gear body has teeth evenly distributed around its perimeter. The at least two weight-reducing cavities are respectively located on both sides of the gear body, with no overlapping projections on their cross-sections. Furthermore, the projections are symmetrically distributed with the center of the shaft hole as the symmetry point, thus reducing the weight of the gear body. However, the weight-reducing cavities are blind holes, requiring material to be retained at the bottom, necessitating milling or the use of a special deep-hole drill, resulting in higher production costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a medium-frequency quenched gear that improves the bending strength of gears, extends the service life of gears, and reduces production costs.

[0005] To solve the above technical problems, this utility model provides a medium-frequency quenched gear, including a gear body with a quenching layer on its surface, a shaft hole and gear teeth on the gear body; the quenching layer is a graphite quenching layer, a convex ring is provided on one side of the graphite quenching layer, the convex ring is arranged around the outer edge of the shaft hole; a right-angled triangular reinforcing block is provided on one side of the graphite quenching layer, the reinforcing block is evenly arranged around the convex ring, and the thickness of the reinforcing block is 2-3 times the thickness of the quenching layer; symmetrical weight-reducing holes are provided through the gear on the gear body, and the weight-reducing holes are circular.

[0006] By adopting the above technical solution, the triangular reinforcing block and the graphite quenching layer work together to significantly improve the bending strength of the gear and increase its service life. Moreover, the drilling of the through symmetrical weight-reducing hole does not require milling or special deep hole drills, thus reducing production costs.

[0007] Preferably, the thickness of the graphite quenching layer is 15%-20% of the gear module.

[0008] By adopting the above technical solution, a graphite quenching layer with a thickness of 15%-20% of the gear module ensures wear resistance on the gear surface while enhancing the overall toughness of the gear.

[0009] Preferably, the long side of the reinforcing block is attached to the graphite quenched layer, the short side of the reinforcing block is attached to the convex ring, the end of the long side away from the convex ring extends towards the tooth root, the distance from the outer wall of the convex ring to the tooth root is A, the length of the long side is greater than or equal to half of A, and the size of the short side is 1 / 2 to 2 / 3 of the size of the long side.

[0010] By adopting the above technical solution, the two right-angled sides of the reinforcing block are respectively bonded to the graphite quenching layer and the convex ring, thereby improving the strength and durability of the gear.

[0011] Preferably, one end of the long side of the reinforcing block is provided with an arc surface, which fits against the outer wall of the convex ring.

[0012] By adopting the above technical solution, the reinforcing block 5 is tightly connected to the arc surface and the convex ring 6, which effectively reduces the gear meshing impact stress and further extends the service life of the gear.

[0013] Preferably, the number of reinforcement blocks is at least two.

[0014] By adopting the above technical solution, the reinforcing blocks are evenly arranged in at least two circumferential directions around the shaft hole to provide uniform support.

[0015] Preferably, the diameter of the weight-reducing holes is 5%-10% of the outer diameter of the gear, and the number is 4-12.

[0016] By adopting the above technical solution, weight-reducing holes are drilled on the gear body to achieve a balance between lightweight gears and high strength.

[0017] Preferably, the spacing between the weight-reducing holes is greater than or equal to twice the hole diameter.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The triangular reinforcing block and graphite quenching layer of this utility model work together to significantly improve the bending strength of the gear and increase its service life. Moreover, the symmetrical weight reduction hole that runs through the gear does not require milling or a special deep hole drill, thus reducing production costs.

[0020] 2. The weight-reducing through-hole gear of this utility model has a large amount of material removed, which improves the weight reduction effect of the gear, reduces the rotational inertia after weight reduction, and improves the transmission efficiency.

[0021] 3. The long side of the reinforcing block of this utility model is attached to the graphite quenched layer, the short side of the reinforcing block is attached to the convex ring, and the end of the long side away from the convex ring extends towards the tooth root. The length of the long side is half the distance from the outer wall of the convex ring to the tooth root, and the length of the short side is 1 / 2 to 2 / 3 of the length of the long side, which improves the strength and durability of the gear. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a perspective view of the present utility model;

[0024] Figure 3 This is a side view of the present invention;

[0025] Figure 4 A schematic diagram showing the reinforcement block on the outer wall of the convex ring of this utility model.

[0026] Drawing numbers: 1. Gear body, 2. Shaft hole, 3. Gear tooth, 4. Graphite hardened layer, 5. Reinforcing block, 6. Convex ring, 7. Weight reduction hole, 8. Keyway, 9. Base plate. Detailed Implementation

[0027] like Figure 1 As shown, a medium-frequency quenched gear includes a gear body 1 with a quenching layer on its surface, a shaft hole 2 and gear teeth 3 on the gear body 1; a keyway 8 is provided on the inner wall of the shaft hole 2. The quenching layer is a graphite quenching layer 4, the thickness of which is 15%-20% of the gear module (in millimeters), ensuring wear resistance of the gear surface while enhancing the overall toughness of the gear. A raised ring 6 is provided on one side of the graphite quenching layer 4, surrounding the outer edge of the shaft hole 2. A right-angled triangular reinforcing block 5 is provided on one side of the graphite quenching layer 4, evenly arranged around the circumference of the raised ring 6. Symmetrical, circular weight-reducing holes 7 penetrate the gear on the gear body 1. The triangular reinforcing blocks 5 and the graphite quenching layer 4 work together to significantly improve the gear's bending strength and increase its service life. Moreover, the symmetrical weight-reducing holes 7 do not require milling or a special deep-hole drill when drilling, reducing production costs. The weight reduction hole 7 passes through the gear, which removes a significant amount of material, thus improving the weight reduction effect of the gear. After weight reduction, the rotational inertia is reduced, and the transmission efficiency is improved.

[0028] like Figure 2 As shown, the diameter of the weight reduction hole 7 is 5%-10% of the outer diameter of the gear, and the number is 4-12, so as to achieve a balance between the lightweight and high strength of the gear.

[0029] The spacing between the weight reduction holes 7 is greater than or equal to twice the diameter of the weight reduction holes. The weight reduction holes 7 should be located away from high stress areas, such as the tooth root and the shaft hole 2.

[0030] A base plate 9 is provided at one end of the keyway 8 near the convex ring 6, which is beneficial for key positioning.

[0031] like Figure 3As shown, the long side of the reinforcing block 5 is attached to the graphite quenched layer 4, and the short side of the reinforcing block 5 is attached to the convex ring 6. The end of the long side away from the convex ring 6 extends towards the tooth root. The distance from the outer wall of the convex ring 6 to the tooth root is A. The length of the long side is greater than or equal to half of A, and the size of the short side is 1 / 2 to 2 / 3 of the size of the long side, which improves the strength and durability of the gear.

[0032] The thickness of reinforcing block 5 is 2-3 times the thickness of the quenched layer, which improves the bending strength of the gear and increases its service life.

[0033] The number of reinforcing blocks 5 is at least two. At least two reinforcing blocks 5 are evenly arranged circumferentially around the shaft hole 2 to provide uniform support.

[0034] like Figure 4 As shown, one end of the long side of the reinforcing block 5 has an arc surface, which fits snugly against the outer wall of the convex ring 6. The reinforcing block 5 is tightly connected to the convex ring 6 through the arc surface, which effectively reduces the gear meshing impact stress and further extends the service life of the gear.

[0035] In another embodiment, the keyway 8 is a through-hole design, which is convenient for manufacturing and is not shown in the figure. The convex ring 6 is welded and installed on the outer edge of the shaft hole 2.

[0036] During the process of mounting the gear on the shaft, the gear and the shaft are connected by a key, resulting in good synchronous transmission. The weight-reducing hole 7 through the gear body 1 can be machined by ordinary milling, reducing production costs. The convex ring 6 is fitted onto the shaft. One long side of the right-angled triangular reinforcing block 5 is attached to the graphite hardened layer 4, and one short side is attached to the convex ring 6. The two work together to improve the bending strength of the gear and increase its service life.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. An intermediate frequency quenching gear, comprising a gear body (1) provided with a quenching layer on the surface, the gear body (1) being provided with a rotating shaft hole (2) and gear teeth (3); characterized in that: The quenching layer is a graphite quenching layer (4). A convex ring (6) is provided on one side of the graphite quenching layer (4). The convex ring (6) is arranged around the outer edge of the rotating shaft hole (2). A right-angled triangular reinforcing block (5) is provided on one side of the graphite quenching layer (4). The reinforcing block (5) is evenly arranged around the convex ring (6) in the circumference. The thickness of the reinforcing block (5) is 2-3 times the thickness of the quenching layer. A weight-reducing hole (7) is symmetrically arranged through the gear body (1). The weight-reducing hole (7) is circular.

2. The medium-frequency quenched gear according to claim 1, characterized in that: The thickness of the graphite quenched layer (4) is 15%-20% of the gear module.

3. The medium-frequency quenched gear according to claim 1, characterized in that: The long side of the reinforcing block (5) is attached to the graphite quenched layer (4), the short side of the reinforcing block (5) is attached to the convex ring (6), the end of the long side away from the convex ring (6) extends towards the tooth root, the distance from the outer wall of the convex ring (6) to the tooth root is A, the length of the long side is greater than or equal to half of A, and the size of the short side is 1 / 2 to 2 / 3 of the size of the long side.

4. The medium-frequency quenched gear according to claim 1, characterized in that: The long side of the reinforcing block (5) is provided with an arc surface, which is in contact with the outer wall of the convex ring (6).

5. The medium-frequency quenched gear according to claim 1, characterized in that: The number of the enhancement blocks (5) is at least two.

6. The medium-frequency quenched gear according to claim 1, characterized in that: The diameter of the weight reduction hole (7) is 5%-10% of the outer diameter of the gear, and the number is 4-12.

7. The medium-frequency quenched gear according to claim 1, characterized in that: The spacing between the weight-reducing holes (7) is greater than or equal to twice the hole diameter.

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