High-strength wear-resistant change gear set

Abstract

The utility model discloses a high-strength wear-resistant change gear set, and belongs to the technical field of gears. The gear set comprises a multi-stage speed change gear, a gear set center shaft and a speed regulation gear ring which are all made of carburized and quenched alloy steel. The gear tooth middle section of the change gear is provided with an oil passing groove to improve lubrication, tooth surface bevel angles are machined at the two ends of the tooth crest to reduce meshing impact, and a tooth bottom groove is plated with a hard chromium wear-resistant layer to improve wear resistance; shaft hole oblique angles are arranged on two sides of the central shaft hole and are matched with transition oblique angles of the central shaft to reduce assembly friction; and the contact area of the adjacent gears is reduced by the annular tooth surface grooves at the spokes. Through structural optimization and surface strengthening, the wear resistance and the contact strength of the gear are remarkably improved, the service life of a change gear set is prolonged, and the gear set is suitable for a high-load gearbox system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gear technical field, especially relate to a high strength wear -resisting gear change gear set. BACKGROUND

[0002] Gear is the wheel rim has tooth, can continuously mesh transmission motion and power mechanical element, its wide application in all walks of life, including gearbox. The core of gearbox is gear change gear set, these gear sets are arranged with different gear ratio, its working principle mainly depends on the switching of the speed regulating gear ring on the gear set, thereby realizing the transformation of gear ratio. But because the speed regulating gear ring is switched between the gear change gear set, the gear tooth and the gear tooth are constantly in collision and friction, therefore, after long time operation, the gear change gear set will appear obvious wear and deformation, thereby affecting the accuracy of gear ratio and transmission. SUMMARY

[0003] The utility model discloses a high strength wear -resisting gear change gear set to solve the above -mentioned technical problems in prior art.

[0004] The utility model discloses a high strength wear -resisting gear change gear set, including the multistage gear set of a plurality of gear change gears, wheel group center shaft and speed regulating gear ring, gear change gear, wheel group center shaft and speed regulating gear ring all adopt high -strength alloy steel, and are handled through carburizing, quenching,

[0005] The center of gear change gear is provided with a center shaft hole, which is sleeved on the wheel group center shaft, a plurality of gear teeth are uniformly arranged on the gear change gear, the number of gear teeth between the gear change gears in the same multistage gear set is different, and the arrangement mode of gradually increasing or decreasing is formed, an oil groove is arranged on the gear teeth at the middle section in the circumferential direction, a tooth surface bevel is arranged on the top of the front and rear ends in the axial direction, and a wear-resistant layer is arranged on the tooth bottom groove between the adjacent gear teeth by plating hard chromium coating technology.

[0006] In the high strength wear -resisting gear change gear set, the both ends of the wheel group center shaft are formed with the shaft end plug with large shaft diameter, and a transition bevel is formed at the joint of the shaft end plug and the wheel group center shaft.

[0007] In the high strength wear -resisting gear change gear set, the center shaft hole of the gear change gear is provided with a shaft hole bevel at the hole edge on both sides, and the shaft hole bevel and the transition bevel are matched to reduce the collision and wear.

[0008] In the high strength wear -resisting gear change gear set, a concave tooth surface groove is arranged on the spoke between the center shaft hole and the gear tooth of the gear change gear in the circumferential direction, and the friction contact area between the adjacent gear change gears is reduced.

[0009] Compared with existing technologies, the high-strength wear-resistant transmission gear set provided by this utility model has the following advantages: by opening the tooth surface helical angle, the collision friction during the meshing and switching of the transmission gear and the speed regulating gear ring is reduced; by opening the oil groove, the lubrication conditions are improved; by strengthening the surface treatment and adding a wear-resistant layer at the tooth root groove between the gear teeth; and by opening the shaft hole helical angle and the tooth surface groove, the frictional contact area between adjacent transmission gears or between the transmission gear and the central shaft of the gear set is reduced; through the above comprehensive measures, the contact strength and fatigue wear resistance of the transmission gear are effectively improved, and the service life of the transmission gear is effectively extended. Attached Figure Description

[0010] Fig. 1 This is a schematic diagram of the overall mating structure of this high-strength, wear-resistant transmission gear set;

[0011] Fig. 2 This is a schematic diagram of the gear structure in this high-strength, wear-resistant gear set;

[0012] Fig. 3 This is a structural cross-sectional view of this high-strength, wear-resistant transmission gear set.

[0013] In the above diagram, 100 is the gear; 110 is the central shaft hole; 111 is the shaft hole bevel angle; 120 is the gear tooth; 121 is the oil groove; 122 is the gear bevel angle; 123 is the wear-resistant layer; 130 is the tooth surface groove; 200 is the gear set central shaft; 210 is the shaft end plug; 211 is the transition bevel angle; and 300 is the speed regulating gear ring. Detailed Implementation

[0014] 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.

[0015] like Figs. 1 to 3 As shown, this high-strength, wear-resistant transmission gear set includes a multi-stage transmission gear 100, a gear set center shaft 200, and a speed-regulating gear ring 300. All components are made of high-strength alloy steel (such as 20CrMnTi) and undergo carburizing, quenching, and low-temperature tempering treatments, achieving a surface hardness of HRC58-62 while maintaining core toughness.

[0016] The gear 100 has a central shaft hole 110 for fitting onto the central shaft 200 of the gear set. The central shaft hole 110 has beveled edges 111 (inclination angle 15°-30°) on both sides to engage with the transition bevel 211 of the central shaft 200, reducing collision friction during axial assembly. The gear teeth 120 are evenly distributed circumferentially, and the number of teeth in each gear of the same multi-stage gear set increases or decreases progressively (e.g., the first stage gear has 20 teeth, the second stage has 25, and the third stage has 30) to achieve the speed change function.

[0017] A middle section of each gear tooth 120 is circumferentially provided with an oil groove 121 (0.5-1mm in depth and 2-3mm in width) for storing lubricating oil and improving lubrication condition of the meshing surface. The top of the axial ends of the gear tooth 120 is provided with a tooth surface bevel 122 (5°-10° in inclination angle) to reduce impact friction when switching meshing with the speed regulating gear ring 300. A hard chrome wear-resistant layer 123 (0.05-0.1mm in thickness) is formed on the tooth bottom groove between adjacent gear teeth 120 by electroplating process, which significantly improves the wear resistance.

[0018] The wheel set center shaft 200 is provided with shaft end plugs 210 with increased shaft diameter at both ends for limiting the axial displacement of the variable speed gear 100. The connection between the shaft end plug 210 and the center shaft is provided with a transition bevel 211 which is matched with the shaft hole bevel 111 in angle to ensure smooth contact during assembly.

[0019] The variable speed gear 100 is provided with a concave tooth surface groove 130 (1-2mm in depth) radially between the center shaft hole 110 and the gear tooth 120, so that the contact area between adjacent variable speed gears 100 is reduced by 30%-40%, thereby reducing friction loss.

[0020] The working principle of the utility model is as follows: the speed regulating gear ring 300 moves axially along the wheel set center shaft 200 to mesh with the variable speed gears 100 with different numbers of teeth to realize speed change. During the meshing process, the oil groove 121 continuously releases lubricating oil, the tooth surface bevel 122 reduces the collision stress, and the hard chrome wear-resistant layer 123 resists tooth bottom wear. The cooperation of the shaft hole bevel 111 and the transition bevel 211 further reduces assembly friction, and the tooth surface groove 130 reduces the contact friction between the multi-stage gears.

[0021] The specific embodiments described herein are merely illustrative of the spirit of the utility model. Those skilled in the art to which the utility model belongs can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the utility model or exceed the scope defined by the appended claims.

[0022] Although various terms are used frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the utility model; any kind of additional limitation by interpreting them is contrary to the spirit of the utility model.

Claims

1. A high-strength, wear-resistant transmission gear set, characterized in that, The gear set includes a multi-stage gear set composed of several variable speed gears (100), a gear set central shaft (200), and a speed regulating gear ring (300). The variable speed gears (100), gear set central shaft (200), and speed regulating gear ring (300) are all made of high-strength alloy steel and have undergone carburizing and quenching treatments. Each variable speed gear (100) has a central shaft hole (110) at its center, through which it is fitted onto the gear set central shaft (200). The gear teeth (120) are evenly distributed in the circumferential direction. The number of gear teeth (120) in the gear set (100) is different for each gear, forming a progressively increasing or decreasing arrangement. The gear teeth (120) have an oil groove (121) in the middle section along the circumferential direction. The tooth surface bevel is provided at the top of the front and rear ends in the axial direction. The tooth bottom groove between adjacent gear teeth (120) is provided with a wear-resistant layer (123) using hard chrome plating technology.

2. The high-strength wear-resistant transmission gear set according to claim 1, characterized in that, Both ends of the wheel set center axle (200) have axle end plugs (210) with axle diameter larger than the main axle diameter of the wheel set center axle (200). A transition angle (211) is formed at the junction of the axle end plugs (210) and the wheel set center axle (200).

3. The high-strength wear-resistant transmission gear set according to claim 2, characterized in that, The central shaft hole (110) of the speed-changing gear (100) has a shaft hole chamfer (111) on both sides of the hole edge. The shaft hole chamfer (111) and the transition chamfer (211) work together to reduce collision wear.

4. The high-strength, wear-resistant transmission gear set according to claim 1, characterized in that, The gear (100) has a recessed tooth surface groove (130) circumferentially opened on the spokes between the central shaft hole (110) and the gear teeth (120).

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