Gearbox sealing structure

Abstract

A gearbox sealing structure belongs to the technical field of gearboxes. Comprising a pump shell, a rubber sealing ring, a bearing bush, a driving chain wheel and a stamping outer ring needle bearing. The bearing bush, the punched outer ring needle roller bearing and the driving chain wheel are sequentially assembled on the pump shell, and the rubber sealing ring is arranged between the driving chain wheel and the bearing bush and located on the outer side of the punched outer ring needle roller bearing. According to the utility model, the existing single rubber sealing ring and steel sealing ring punched outer ring needle roller bearing is combined and changed into the punched outer ring needle roller bearing of the rubber sealing ring, so that a gasket is cancelled, the number of parts is small, the assembly process is simple, the structural rigidity is improved, the friction is reduced, the service life of the parts is prolonged, the matching relationship design difficulty is small, and the design can be completed without later test verification; the design type selection period is short, and the trial-and-error cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of gearbox technology, and specifically relates to a gearbox sealing structure. Background Technology

[0002] There is a direct relationship between transmission seals and oil pressure. The integrity of the seals directly affects the stability of the oil pressure inside the transmission, and thus affects the normal operation of the transmission.

[0003] The primary function of transmission seals is to prevent lubricating oil leakage and ensure stable internal pressure. Aging, damage, or improper installation of seals can all cause lubricating oil to leak from the transmission, leading to a drop in oil pressure. Specifically, transmission seals include two types: static seals and dynamic seals. Static seals mainly involve sealing pressure and non-pressure areas, while dynamic seals include sealing rotating and reciprocating components.

[0004] When transmission fluid pressure is too low, possible causes include insufficient fluid level in the oil pan, a clogged oil filter, a problem with the oil suction pipe seal, and severe wear of the transmission pump. These issues can all lead to a drop in fluid pressure, thus affecting the normal operation of the transmission.

[0005] Existing sealing structures mostly use individual rubber sealing rings, requiring gaskets to be installed on both sides during assembly, making the assembly process complex; or they use stamped outer ring needle roller bearings with steel sealing rings. This structure is simple to assemble, but the steel sealing ring, the bearing outer ring, and the mating shaft are all small clearance fits, while the bearing outer ring and the bearing housing are interference fits. After press-fitting, the inner diameter shrinks, making the design of the fit relationship of the steel sealing ring more difficult. Moreover, it is currently impossible to verify whether the fit relationship of the steel sealing ring meets the oil pressure control requirements of the gearbox from the design stage. It can only be deduced through whole-machine testing, resulting in a long design verification cycle and high cost. Utility Model Content

[0006] This utility model aims to solve the problems of existing gearbox sealing structures, such as a large number of parts, complex assembly processes, poor structural rigidity, difficulty in designing mating relationships, long design verification cycle, and high cost, and thus provides a gearbox sealing structure.

[0007] The technical solution adopted by this utility model is:

[0008] A gearbox sealing structure includes a pump housing, a rubber sealing ring, a bearing bushing, a drive sprocket, and a stamped outer ring needle roller bearing; the bearing bushing, the stamped outer ring needle roller bearing, and the drive sprocket are sequentially assembled onto the pump housing, and the rubber sealing ring is disposed between the drive sprocket and the bearing bushing, and located outside the stamped outer ring needle roller bearing.

[0009] Compared with the prior art, the present invention has the following advantages:

[0010] This utility model combines the existing single rubber sealing ring and steel sealing ring stamped outer ring needle roller bearings, and replaces them with a rubber sealing ring stamped outer ring needle roller bearing. It eliminates the need for gaskets, reduces the number of parts, simplifies the assembly process, improves structural rigidity, reduces friction, extends the life of parts, and makes the design of the mating relationship less difficult. It can be completed without the need for subsequent testing and verification, resulting in a short design and selection cycle and low trial and error costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] The components include: 1. Pump housing; 2. Rubber sealing ring; 3. Bearing bushing; 4. Drive sprocket; 5. Stamped outer ring needle roller bearing. Detailed Implementation

[0013] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model will be provided below with reference to the accompanying drawings.

[0014] like Figure 1 As shown, this utility model provides a gearbox sealing structure, including a pump housing 1, a rubber sealing ring 2, a bearing bushing 3, a drive sprocket 4, and a stamped outer ring needle roller bearing 5; the bearing bushing 3, the stamped outer ring needle roller bearing 5, and the drive sprocket 4 are sequentially assembled onto the pump housing 1, and the rubber sealing ring 2 is disposed between the drive sprocket 4 and the bearing bushing 3, and is located outside the stamped outer ring needle roller bearing 5.

[0015] The inner circumferential surface of the drive sprocket 4 is provided with a stepped structure that can accommodate the rubber sealing ring 2 and the stamped outer ring needle roller bearing 5.

[0016] The length of the bearing bushing 3 is longer than the sum of the lengths of the rubber sealing ring 2 and the stamped outer ring needle roller bearing 5.

[0017] The fit relationship of the stamped outer ring needle roller bearing 5 is designed based on the boundary conditions of the parts and the interference fit relationship, and the design and selection table of the rubber sealing ring 2 can be consulted, so the fit relationship design is not difficult.

[0018] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A gearbox sealing structure, characterized in that: The pump housing (1), rubber sealing ring (2), bearing bushing (3), drive sprocket (4) and stamped outer ring needle roller bearing (5) are included. The bearing bushing (3), stamped outer ring needle roller bearing (5) and drive sprocket (4) are sequentially assembled onto the pump housing (1). The rubber sealing ring (2) is located between the drive sprocket (4) and the bearing bushing (3) and is located outside the stamped outer ring needle roller bearing (5).

2. The gearbox sealing structure according to claim 1, characterized in that: The inner circumferential surface of the drive sprocket (4) is provided with a stepped structure that can accommodate the rubber sealing ring (2) and the stamped outer ring needle roller bearing (5).

3. The gearbox sealing structure according to claim 1, characterized in that: The length of the bearing bushing (3) is longer than the sum of the lengths of the rubber sealing ring (2) and the stamped outer ring needle roller bearing (5).

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