High-wear-resistance small-modulus helical gear

Abstract

The utility model discloses a high-wear-resistance small-modulus helical gear which comprises a hub. A gear ring is arranged on the outer surface of the hub, two oil storage grooves are formed in the hub, a plurality of first thin grooves are formed in the positions, corresponding to the oil storage grooves, in the hub, a plurality of second thin grooves are formed in the positions, corresponding to the first thin grooves, of the gear ring, and first bolts are in threaded connection with the upper side and the lower side of the hub respectively. Lubricating oil needs to be injected into the two oil storage grooves in the hub respectively before the hub is used, when equipment runs, under the action of centrifugal force, the lubricating oil is evenly thrown out through the first thin groove and the second thin groove designed in the hub to form an oil film covering the meshing face of the gear ring, continuous lubrication is achieved, and the service life of the gear ring is prolonged. By means of the design, the problem that a small-modulus helical tooth gear depends on regular lubrication maintenance is effectively solved, the phenomenon that abrasion is intensified due to instantaneous oil shortage of a tooth surface caused by splashing and loss of a lubricating agent in high-speed operation in a traditional lubricating mode is avoided, and meanwhile the use cost and the downtime caused by frequent filling of the lubricating agent are reduced.

Description

Technical Field

[0001] This utility model relates to the field of small module helical gears, and more particularly to small module helical gears with high wear resistance. Background Technology

[0002] Existing high-wear-resistant, small-module helical gears are typically made of high-strength alloy steels such as 20CrMnTi and 42CrMo, or special engineering plastics such as PEEK and PI. They undergo advanced carburizing and quenching, surface nitriding, or PVD coating processes such as TiN and CrN for reinforcement. The gears employ an optimized helix angle design, combined with precision grinding techniques such as CNC profile grinding or worm wheel grinding, ensuring high accuracy and effectively reducing meshing noise and vibration. Their unique helical tooth structure significantly improves load distribution within a small module range, through the simultaneous operation of multiple teeth. Meshing reduces the force on a single tooth, and precise shaping techniques, such as shaped teeth or thinning of tooth ends, further alleviate stress concentration at the tooth root. To adapt to harsh working conditions, some high-end models also adopt composite lubrication solutions, such as laser-processing micro-textures on the tooth surface and embedding molybdenum disulfide or graphene solid lubricants, so that the gears can maintain their service life even in high-speed operation, heavy load and high dust environment. These high-performance gears have been successfully applied in fields with stringent reliability requirements, such as micro planetary gear motors, aerospace servos and medical precision transmission systems, significantly improving the service life and operational stability of the equipment.

[0003] While common small-module helical gears have excellent load-bearing capacity and long service life, their reliance on manual lubrication for maintenance not only increases operating costs and downtime but also affects the reliability of equipment operation. Especially at high speeds, lubricant is prone to splashing or loss, leading to momentary oil shortage on the tooth surface, which exacerbates wear and may even cause premature failure. This problem is more prominent in maintenance-free scenarios with high cleanliness and long service life requirements, such as medical equipment, often forcing manufacturers to adopt more expensive solid lubricants or self-lubricating composite material alternatives, thereby further increasing the overall manufacturing cost.

[0004] Therefore, while the aforementioned common small-module helical gears have excellent load-bearing capacity and long service life, they rely on regular lubrication maintenance. Frequent lubrication replenishment increases operating costs and downtime. Furthermore, lubricant splashing or loss can easily occur during high-speed operation, leading to instantaneous oil shortage on the tooth surface and exacerbating wear. Therefore, high-wear-resistant small-module helical gears can be designed. Utility Model Content

[0005] To overcome the common problem that while small-module helical gears have excellent load-bearing capacity and long service life, they rely on regular lubrication maintenance. Frequent lubrication replenishment increases operating costs and downtime. Furthermore, lubricant splashing or loss can easily occur during high-speed operation, leading to instantaneous oil shortage on the tooth surface and aggravating wear.

[0006] The technical solution of this utility model is as follows: a high wear-resistant small module helical gear, including a hub; and a gear ring provided on the outer surface of the hub, two oil storage grooves are opened inside the hub, and multiple fine grooves are opened inside the hub corresponding to the positions of the oil storage grooves, and multiple fine grooves are opened on the gear ring corresponding to the positions of the fine grooves, and bolts are threadedly connected to the upper and lower sides of the hub respectively.

[0007] Preferably, before use, lubricating oil should be injected into the two oil reservoirs on the hub, and the bolts with pre-applied thread sealant should be screwed into the threaded holes of the hub and tightened to the specified torque. When the equipment is running, under the action of centrifugal force, the lubricating oil is evenly thrown out through the fine grooves one and two designed inside the hub to form an oil film covering the meshing surface of the gear ring, thereby achieving continuous lubrication.

[0008] Preferably, the surface of bolt one is provided with thread sealant, and a support ring is fixedly connected to the bottom of the wheel hub.

[0009] Preferably, the gear ring and the support ring are movably connected, and three circular grooves are provided on the top of the wheel hub.

[0010] Preferably, a pressure plate is provided on the top of the wheel hub, and two bolts are connected to the internal thread of the pressure plate.

[0011] As a preferred embodiment, bolt two is threaded to the wheel hub, and the pressure plate has a slot corresponding to the position of bolt one.

[0012] Preferably, the outer surface of the gear ring is coated with a diamond-like carbon material, and a slider is fixedly connected to the inner side of the gear ring.

[0013] Preferably, the outer surface of the wheel hub is provided with a groove, and the slider is slidably connected to the groove.

[0014] The beneficial effects of this utility model are:

[0015] Before use, lubricating oil needs to be injected into the two oil reservoirs on the hub, and the bolts with pre-applied thread sealant should be screwed into the threaded holes of the hub and tightened to the specified torque. When the equipment is running, under the action of centrifugal force, the lubricating oil is evenly thrown out through the fine grooves one and two designed inside the hub to form an oil film covering the meshing surface of the gear ring, achieving continuous lubrication. This design effectively improves the problem that although small module helical gears have excellent load-bearing capacity and long service life, they rely on regular lubrication maintenance. It avoids the phenomenon of instantaneous oil shortage on the tooth surface, which is prone to occur when traditional lubrication methods are running at high speeds, due to lubricant splashing and loss, which exacerbates wear. At the same time, it reduces the operating costs and downtime caused by frequent lubrication. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0017] Figure 2 The diagram shown is a three-dimensional lower cross-sectional view of the wheel hub of this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional side sectional view of the present invention.

[0019] Figure 4 The diagram shown is a three-dimensional front cross-sectional view of the present invention.

[0020] Figure 5 The diagram shown is a three-dimensional lower cross-sectional view of the present invention.

[0021] Explanation of reference numerals in the attached diagram: 1. Hub; 2. Oil reservoir; 3. Slot 1; 4. Slot 2; 5. Bolt 1; 6. Support ring; 7. Gear ring; 8. Circular groove; 9. Bolt 2; 10. Pressure plate; 11. Empty groove; 12. Slider; 13. Slide groove. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figures 1-5 This utility model provides an embodiment: a high wear-resistant, small-module helical gear includes a hub 1; it also includes a gear ring 7 disposed on the outer surface of the hub 1, two oil reservoirs 2 are formed inside the hub 1, and multiple fine grooves 3 are formed inside the hub 1 corresponding to the positions of the oil reservoirs 2. Multiple fine grooves 4 are formed on the gear ring 7 corresponding to the positions of the fine grooves 3. Bolts 5 are threadedly connected to the upper and lower sides of the hub 1, respectively. Before use, lubricating oil needs to be injected into the two oil reservoirs 2 on the hub 1, and the bolts pre-coated with thread sealant are screwed into the threaded holes of the hub 1 and then... When the specified torque is used for tightening, under the action of centrifugal force, the lubricating oil is evenly thrown out through the fine grooves 3 and 4 designed inside the hub 1 to form an oil film covering the meshing surface of the gear ring 7, thus achieving continuous lubrication. This design effectively improves the problem that although small module helical gears have excellent load-bearing capacity and long service life, they rely on regular lubrication maintenance. It avoids the phenomenon of instantaneous oil shortage on the tooth surface, which is prone to occur when traditional lubrication methods are used at high speeds, due to lubricant splashing and loss, which exacerbates wear. At the same time, it reduces the operating costs and downtime caused by frequent lubrication.

[0024] Please see Figures 1-3In this embodiment, the surface of bolt 5 is provided with thread sealant, and the bottom of hub 1 is fixedly connected with support ring 6. The thread sealant can effectively fill the thread fit gap, significantly improve the sealing performance between bolt 5 and the threaded hole of hub 1, and prevent lubricating oil from leaking from the oil injection hole on the side of hub 1 due to centrifugal force when the gearbox is running. It also has an anti-loosening function and is suitable for vibration conditions. Gear ring 7 is movably connected to support ring 6. Three circular grooves 8 are opened on the top of hub 1. During installation, gear ring 7 is precisely nested on support ring 6 using a special clamp. A pressure plate 10 is provided on the top of hub 1. Bolt 9 is threadedly connected inside pressure plate 10. After bolt 9 is inserted into the circular groove 8, pressure plate 10 is rigidly connected to hub 1 through three evenly distributed bolts 9.

[0025] Please see Figures 2-5 In this embodiment, bolt 29 is threadedly connected to hub 1. The pressure plate 10 has a slot 11 corresponding to the position of bolt 15. The slot 11 allows the pressure plate 10 to not interfere with the installation and removal of bolt 15 when tightening. At the same time, the pressure plate 10 axially presses and fixes the gear ring 7. The outer surface of the gear ring 7 is coated with diamond-like carbon. A slider 12 is fixedly connected to the inner side of the gear ring 7. The diamond-like carbon coating increases the strength of the gear ring 7. A groove 13 is provided on the outer surface of hub 1. The slider 12 is slidably connected to the groove 13. The slider 12 and the groove 13 adopt a transition fit. Molybdenum disulfide grease is applied during assembly. The two can precisely constrain the circumferential position of the gear ring 7 and help fix the gear ring 7 in the correct position on hub 1.

[0026] Before operation, lubricating oil needs to be injected into the two oil reservoirs 2 on the hub 1. Then, the bolt 5, pre-coated with thread sealant, is screwed into the threaded hole of the hub 1 and tightened to the specified torque. When the equipment is running, under the action of centrifugal force, the lubricating oil is evenly thrown out through the fine grooves 3 and 4 designed inside the hub 1, forming an oil film covering the meshing surface of the gear ring 7 to achieve continuous lubrication. The thread sealant can effectively fill the thread fit clearance, which can not only prevent lubricating oil from leaking from the oil injection hole, but also inhibit the loosening tendency of the bolt 5 under vibration conditions. During installation, the gear ring 7 is first precisely nested into the bottom of the hub 1 using a special clamp. On the support ring 6, ensure that the mating surface is not misaligned; then cover the top of the hub 1 with the pressure plate 10, so that the three bolts 9 inside the pressure plate 10 are inserted into the circular grooves 8 of the hub 1 to form a rigid connection. The hollow groove 11 designed in the pressure plate 10 avoids the head of the bolt 5, ensuring that the two do not interfere with each other during assembly. At the same time, the uniform pressure of the pressure plate 10 keeps the gear ring 7 axially fixed without movement. The outer surface of the gear ring 7 is coated with a diamond-like coating to improve the tooth surface's resistance to abrasive wear. The inner slider 12 and the hub 1 groove 13 together constrain the circumferential position of the gear ring 7 to prevent wobbling during operation and ensure that the gear always stays in the correct meshing position on the hub 1.

[0027] Through the above steps, before use, lubricating oil needs to be injected into the two oil reservoirs 2 on the hub 1 respectively. Then, the bolt 5 with pre-applied thread sealant is screwed into the threaded hole of the hub 1 and tightened to the specified torque. When the equipment is running, under the action of centrifugal force, the lubricating oil is evenly thrown out through the fine grooves 3 and 4 designed inside the hub 1, forming an oil film covering the meshing surface of the gear ring 7 to achieve continuous lubrication. This solves the problem that although common small module helical gears have excellent load-bearing capacity and long service life, they rely on regular lubrication maintenance. Frequent lubricant addition increases the cost of use and downtime. Moreover, lubricant splashing or loss is prone to occur during high-speed operation, resulting in instantaneous oil shortage on the tooth surface, which aggravates wear and further increases the overall manufacturing cost.

Claims

1. High wear resistance small module helical gear, comprising a hub (1); characterized in that: It also includes a toothed ring (7) on the outer surface of the hub (1), two oil storage grooves (2) are opened inside the hub (1), a number of grooves (3) are opened inside the hub (1) corresponding to the oil storage grooves (2), a number of grooves (4) are opened on the toothed ring (7) corresponding to the grooves (3), and bolts (5) are threadedly connected to the upper and lower sides of the hub (1).

2. The high wear resistance small module helical gear according to claim 1, characterized in that: The surface of bolt 1 (5) is provided with thread sealant, and the bottom of the hub (1) is fixedly connected with a support ring (6).

3. The high wear resistance small module helical gear according to claim 2, characterized in that: The gear ring (7) is movably connected to the support ring (6), and the top of the hub (1) has three circular grooves (8).

4. The high wear resistance small module helical gear according to claim 1, characterized in that: A pressure plate (10) is provided on the top of the hub (1), and the internal thread of the pressure plate (10) is connected to bolt two (9).

5. The high wear resistance small module helical gear according to claim 4, characterized in that: Bolt 2 (9) is threaded to hub (1), and the pressure plate (10) has a slot (11) corresponding to the position of bolt 1 (5).

6. The high wear-resistant small-module helical gear according to claim 3, characterized in that: The outer surface of the gear ring (7) is coated with diamond-like carbon, and the inner side of the gear ring (7) is fixedly connected to a slider (12).

7. A high wear resistance small module helically toothed gear according to claim 6, characterized in that: The outer surface of the hub (1) is provided with a groove (13), and the slider (12) is slidably connected to the groove (13).

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