A gear assembly for a speed reducer

Abstract

The utility model discloses a gear assembly for speed reducer belongs to the technical field of speed reducer. The gear assembly includes the casing and the limiting component in its and contains, the limiting component includes the support cylinder fixedly connected in the casing inside, contains the bearing in the support cylinder, rotates the cooperation in the bearing inside center shaft and the gear fixed on center shaft. Its core lies in, the limiting component still includes the limiting disc coaxially fixed on center shaft, and this limiting disc abuts respectively in two opposite end surfaces of gear. In addition, the casing is the structure of opposite opening. The utility model through limiting disc accurately defined the axial position of gear, effectively prevented the gear from happening to shift when transmission, guaranteed transmission stability and meshing accuracy, simultaneously, the sealing structure of optimization improved the sealing reliability of casing, prevented lubricating material leakage, prolonged the life. The utility model structure is simple, and the assembly maintenance is convenient, and the reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and in particular to a gear assembly for a speed reducer. Background Technology

[0002] As a widely used power transmission mechanism, the speed reducer relies on its internal gear assembly to transmit torque and change speed. In a typical gear assembly, gears are mounted on a shaft and output power through meshing with other gears.

[0003] To improve transmission efficiency, achieve smooth meshing, or change the transmission direction, speed reducers often use helical or bevel gears. However, during meshing transmission, in addition to transmitting circumferential force, these gears inevitably generate an axial component force along the axis, which continuously acts on the gear itself.

[0004] In some existing designs, the axial positioning of the gear is usually achieved by relying on the interference fit between the gear and the shaft, or by using bearings at both ends of the shaft to indirectly bear and limit the axial force. This positioning method can maintain stability in the early stages of equipment operation, but with long-term heavy-load operation or frequent start-stop, the continuous and changing axial force can easily cause fretting wear on the mating surfaces of the gear and the shaft, or increase the bearing clearance.

[0005] Once the above situation occurs, it will cause the gear to move axially on the shaft. After the axial position of the gear is offset, it will directly affect the correct meshing state with the mating gear, resulting in a decrease in meshing accuracy, increased transmission noise and vibration, and in severe cases, even abnormal wear of the gear teeth, shortening the service life of the entire gear assembly and even the reducer.

[0006] Therefore, this utility model proposes a gear assembly for a speed reducer to overcome the shortcomings of the prior art. Utility Model Content

[0007] To overcome the above deficiencies, this utility model provides a gear assembly for a speed reducer, which aims to improve the problems in existing speed reducer gear assemblies, such as insufficient reliability of the housing sealing structure leading to easy leakage of lubricating materials, and axial movement of the internal gears affecting transmission stability.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a gear assembly for a speed reducer, comprising: a housing, and a limiting component housed inside the housing, the limiting component comprising a support cylinder fixedly connected inside the housing, the support cylinder housing a bearing, a central shaft rotatably fitted inside the bearing, and a gear fixed on the central shaft; and a limiting disc.

[0009] The number of the limiting disks is two, and they are respectively coaxially fixed on the central shaft.

[0010] Furthermore, the two limiting discs are respectively disposed at the two opposite end faces of the gear, and the inner side of the limiting disc abuts against the end face of the gear. Through this structural combination, a bidirectional and reliable axial limiting is formed on the central shaft for the gear.

[0011] Preferably, the gear assembly for the reducer further includes a sealing component, the housing has a split structure, and the sealing component is disposed at the split mating surface of the housing to improve the sealing performance of the housing.

[0012] Preferably, the sealing assembly includes a sealing strip that is clamped between the split mating surfaces of the housing.

[0013] Preferably, the sealing assembly further includes an extrusion strip, which is arranged side by side along the length of the sealing strip and works together with the sealing strip to enhance the sealing effect.

[0014] Preferably, the sealing assembly further includes bolts that pass through the housing and are used to fasten the split mating surfaces of the housing, so that the sealing strip and the extrusion strip are deformed under pressure, thereby filling the minute gaps between the mating surfaces.

[0015] Preferably, the connection between the bearing and the support cylinder is a press fit to achieve a stable fixation.

[0016] Preferably, the connection between the gear and the central shaft is a key connection to ensure reliable torque transmission.

[0017] Preferably, the connection between the limiting plate and the central shaft is an interference fit to ensure that the limiting plate will not shift when subjected to axial force.

[0018] This utility model has the following beneficial effects:

[0019] 1. This utility model solves the problem of unstable meshing caused by gears moving due to axial force during transmission by fixing a limiting disc coaxially on the central shaft and having the limiting disc abut against the two end faces of the gear. It achieves the technical effect of accurately limiting the axial position of the gear, ensuring gear meshing accuracy, and thus improving the smoothness and reliability of transmission.

[0020] 2. This utility model solves the problems of existing reducer housings having a single sealing structure, poor sealing effect, and easy leakage of lubricating materials and intrusion of external contaminants by setting a sealing strip and a compression strip between the split joint surfaces of the housing and using the pressure generated when the housing is tightened by bolts to deform the two together. This achieves the technical effect of forming a double reliable seal, effectively preventing the leakage of lubricating materials, and extending the service life of the gear assembly. Attached Figure Description

[0021] Figure 1 This is a perspective view of a gear assembly for a speed reducer proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the inner wall structure of the housing of a gear assembly for a speed reducer proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the inner wall structure of the housing of a gear assembly for a speed reducer proposed in this utility model;

[0024] Figure 4 This is a schematic diagram of the outer wall structure of the sealing component of a gear assembly for a speed reducer proposed in this utility model;

[0025] Figure 5 This is a schematic diagram of the outer wall structure of the limiting component of a gear assembly for a speed reducer proposed in this utility model.

[0026] Legend:

[0027] 1. Housing; 2. Sealing assembly; 201. Sealing strip; 202. Bolt; 203. Extrusion strip; 3. Limiting assembly; 301. Support cylinder; 302. Bearing; 303. Gear; 304. Limiting plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figures 1-5 The present invention provides an embodiment of a gear assembly for a speed reducer, comprising a housing 1 and a limiting component 3 housed inside the housing 1. The housing 1 serves as the mounting base for the entire device and provides protection and support for the internal components. The limiting component 3 is used to transmit power and precisely limit the gears during the transmission process.

[0030] Specifically, the limiting component 3 includes a support cylinder 301 fixedly connected inside the housing 1. A bearing 302 is fixed on the inner peripheral wall of the support cylinder 301 by press fitting. A central shaft (305) is rotatably fitted inside the bearing 302. A gear 303 is fixed on the outer periphery of the central shaft (305) by key connection. The gear 303 rotates synchronously with the central shaft (305) to transmit torque.

[0031] As the core improved structure of this solution, the limiting component 3 also includes a limiting disk 304. The limiting disk 304 is coaxially fixed on the central shaft (305), and there are two limiting disks 304. The two limiting disks 304 are fixed on the central shaft (305) by interference fit. In terms of position, the two limiting disks 304 are respectively set at the two opposite end faces of the gear 303, and the inner side of each limiting disk 304 abuts against the corresponding end face of the gear 303. Through this structure, the axial position of the gear 303 on the central shaft (305) is completely limited by the two limiting disks 304. When the gear 303 is subjected to axial force during transmission, the axial force will be transmitted to the limiting disk 304, thereby effectively preventing the gear 303 from axially moving and ensuring the accuracy of gear meshing and the smoothness of the transmission process.

[0032] In this embodiment, the outer shell 1 has a split structure, which facilitates the installation and maintenance of the internal limiting component 3. A sealing component 2 is provided at the split joint surface of the outer shell 1 with the split structure; the sealing component 2 includes a sealing strip 201, a bolt 202 and a compression strip 203.

[0033] Specifically, the sealing strip 201 is clamped between the split mating surfaces of the housing 1, and the extrusion strip 203 is arranged side by side along the length of the sealing strip 201 and is also clamped between the split mating surfaces of the housing 1; the bolt 202 passes through the housing 1 and is used to fasten the split structure housing 1 together; during the fastening process, the fastening force generated by the bolt 202 will apply pressure to the split mating surfaces of the housing 1, and this pressure will cause the sealing strip 201 and the extrusion strip 203 to be compressed and elastically deformed at the same time, thereby tightly filling any micro gaps that may exist between the mating surfaces, forming a reliable sealing barrier, effectively preventing the lubricating material inside the housing 1 from leaking out, and also preventing external dust and moisture from entering the interior of the housing 1;

[0034] In a preferred embodiment, in order to achieve a more stable fixation between the support cylinder 301 and the bearing 302, the bearing 302 is fixed to the inner peripheral wall of the support cylinder 301 by press fitting, and the interference fit ensures that there will be no relative rotation or axial movement between the two.

[0035] As another preferred embodiment, in order to ensure that the torque between the gear 303 and the central shaft (305) can be reliably transmitted without relative slippage, the gear 303 is fixed to the outer periphery of the central shaft (305) by a key connection. This connection method has a simple structure, is easy to install and disassemble, and reliably transmits torque.

[0036] As another preferred embodiment, in order to ensure that the limiting disk 304 is accurately positioned and firmly fixed on the central shaft (305), the limiting disk 304 is fixed on the central shaft (305) by an interference fit. Through the tight fit, the limiting disk 304 can withstand the axial force from the gear 303 without displacement.

[0037] Working principle: When external power is input to the central shaft (305), the central shaft (305) starts to rotate. Since the gear 303 is fixed on the central shaft (305) by key connection, the gear 303 rotates synchronously with the central shaft (305) and realizes the transmission of power and the change of speed by meshing with other gears in the reducer.

[0038] During transmission, especially when helical or bevel gears are used, gear 303 will be subjected to an axial force along the axis of the central shaft (305), which attempts to drive gear 303 to move axially. Since the two limiting discs 304 are firmly fixed to the central shaft (305) by interference fit and abut against the two end faces of gear 303 respectively, the axial force of gear 303 will be directly transmitted to one of the limiting discs 304. The limiting disc 304 locks the force on the central shaft (305), thereby preventing any axial displacement of gear 303, ensuring the constant meshing position of the gears, and guaranteeing the smoothness and reliability of the transmission.

[0039] Meanwhile, the split mating surfaces of the housing 1 are fastened by bolts 202. The tightening force of the bolts 202 acts on the sealing strip 201 and the compression strip 203, causing them to undergo elastic deformation and tightly fill all gaps in the mating surfaces. This structure forms a reliable static seal, effectively preventing leakage of lubricating oil or grease used for lubricating gears and bearings inside the housing 1, and preventing external contaminants from entering, thus ensuring the long-term stable operation of the gear assembly for the reducer.

Claims

1. A gear assembly for a speed reducer, comprising: Outer shell (1); and a limiting component (3) housed inside the outer casing (1); The limiting component (3) includes a support cylinder (301) fixedly connected inside the outer shell (1). The support cylinder (301) contains a bearing (302). A central shaft (305) is rotatably fitted inside the bearing (302). A gear (303) is fixed on the central shaft (305). Its features are, The limiting component (3) further includes a limiting disk (304), which is coaxially fixed on the central shaft (305) and abuts against two opposite end faces of the gear (303).

2. The gear assembly for a speed reducer according to claim 1, characterized in that, The gear assembly for the reducer also includes a sealing component (2), the housing (1) has a split structure, and the sealing component (2) is disposed at the split mating surface of the housing (1).

3. The gear assembly for a speed reducer according to claim 2, characterized in that, The sealing assembly (2) includes a sealing strip (201) which is held between the split mating surfaces of the housing (1).

4. The gear assembly for a speed reducer according to claim 3, characterized in that, The sealing assembly (2) further includes an extrusion strip (203), which is arranged side by side along the length of the sealing strip (201).

5. The gear assembly for a speed reducer according to claim 4, characterized in that, The sealing assembly (2) further includes a bolt (202) which passes through the housing (1) and is used to fasten the split mating surfaces of the housing (1) so that the sealing strip (201) and the extrusion strip (203) are deformed under pressure.

6. The gear assembly for a speed reducer according to claim 1, characterized in that, The bearing (302) is fixed to the inner circumferential wall of the support cylinder (301) by press fitting.

7. The gear assembly for a speed reducer according to claim 1, characterized in that, The gear (303) is fixed to the outer periphery of the central shaft (305) by a key connection.

8. The gear assembly for a speed reducer according to claim 1, characterized in that, The limiting plate (304) is fixed to the central shaft (305) by an interference fit.

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