Loader gearbox output shaft sealing structure

Abstract

The utility model discloses a loader gearbox output shaft sealing structure. An outer ring of a bearing is matched with a box body, an inner ring of the bearing is fixed on an output shaft, and the end face of the bearing is flatly attached to a gear; the flange is installed on the output shaft through a spline, an O-shaped ring is arranged in an inner hole, close to the right end, of the flange, and the flange is locked on the output shaft through threaded fit of a gasket and a nylon nut through the output shaft. Two O-shaped rings are arranged on the outer circle of the oil seal seat assembly, an oil seal is arranged in an inner hole, the outer circle of the oil seal seat assembly is matched with the box body, and the oil seal in the inner hole is matched with the shaft sleeve; an inner hole of the shaft sleeve is matched with the output shaft, an outer circle is matched with an oil seal of the oil seal seat assembly, and the left end of the shaft sleeve is tightly attached to the right end of the bearing. The gearbox output shaft sealing structure is simple and compact in structure, convenient and efficient to install and low in maintenance cost, and solves the problem that in the prior art, due to the fact that an oil seal matching position is compounded on a flange, when the oil seal matching position is abraded by small sand, sealing is not tight, the flange needs to be replaced, and maintenance cost is high.

Description

Technical Field

[0001] The utility model relates to the technical field of loader gearbox assemblies, in particular to a loader gearbox output shaft sealing structure. Background Art

[0002] Oil leakage from the output shaft of the loader's gearbox and wear on the flange oil seal are common faults in the loader's after-sales service. The main reasons for this fault are: on the one hand, when the loader is operating, the output shaft of the gearbox is in a high-speed rotational motion state, and there is relative movement between its oil seal and the oil seal mating position. When the gearbox continues to work, the oil temperature of the internal transmission oil will continue to rise. At this time, the oil seal will be affected by the oil temperature of the transmission oil and will wrap in the direction of the oil seal mating position. Since there is relative movement between the oil seal and the oil seal mating position, wear will occur between the two at this time. Over time, the matching clearance between the oil seal and the oil seal mating position will become larger and larger, resulting in oil leakage; on the other hand, since loaders usually work outdoors and the working conditions are relatively harsh, small sand and gravel can easily enter the oil seal and the oil seal mating position. Since the output shaft is in a high-speed rotational motion state, it is easy to cause wear on the oil seal and the oil seal mating position, resulting in oil leakage from the output shaft.

[0003] When the oil seal is aged or worn, it needs to be replaced. When the oil seal is worn by small sand and gravel, resulting in poor sealing, the flange needs to be replaced. Since the flange involves the installation of splines and brake discs, its manufacturing precision requirements are high, which makes the production cost high, which will greatly increase the maintenance cost. In order to overcome the problem of replacing the flange due to the wear of the oil seal, it is necessary to develop a loader gearbox output shaft sealing structure with good sealing effect. Summary of the invention

[0004] The utility model aims to solve the above defects and provide a loader gearbox output shaft sealing structure with simple and compact structure, convenient and efficient installation and low maintenance cost, so as to solve the problem that the gearbox output shaft sealing structure in the prior art has high maintenance cost because the oil seal matching position is compounded on the flange and when the oil seal matching position is worn by small sand and gravel and the sealing is not tight, the flange needs to be replaced.

[0005] To achieve the above purpose, the utility model loader gearbox output shaft sealing structure includes a gear 1, a bearing 2, an oil seal seat assembly 3, a sleeve 4, a flange 5, a nylon nut 6, a gasket 7, an O-ring 8, and an output shaft 9; the gear 1 is mounted on the output shaft 9 through a spline fit; the outer ring of the bearing 2 is matched with the housing, and the inner ring is fixed on the output shaft 9, and the end face of the bearing 2 is flush with the gear 1; the outer circle of the oil seal seat assembly 3 is provided with two O-rings, and the inner hole is provided with an oil seal; the flange 5 is mounted on the output shaft 9 through a spline fit, and the flange 5 is provided with an O-ring 8 in the inner hole near the right end face, and the flange 5 is locked on the output shaft 9 by using a gasket 7 and a nylon nut 6 through the output shaft thread fit; the inner hole of the sleeve 4 is matched with the output shaft 9, and the outer circle is matched with the oil seal of the oil seal seat assembly 3, and its left end is close to the right end of the bearing 2, and the right end is close to the left end of the flange 5; the outer circle of the oil seal seat assembly 3 is matched with the housing, and the oil seal of the inner hole is matched with the sleeve 4.

[0006] The utility model discloses a loader gearbox output shaft sealing structure, which eliminates the integral structure of the oil seal seat assembly and the flange, and has the following technical features and beneficial effects:

[0007] 1. By compounding the oil seal fitting position on the shaft sleeve 4, the sealing effect is good; when the seal is not tight after a long period of operation and needs to be repaired and replaced, only the shaft sleeve 4 needs to be replaced, which greatly reduces the maintenance cost and solves the problem of high maintenance cost in the prior art gearbox output shaft sealing structure because the oil seal fitting position is compounded on the flange and when the oil seal fitting position is worn by small sand and gravel and the seal is not tight, the flange needs to be replaced.

[0008] 2. The structure is simple and compact, and the installation is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The utility model is a main sectional structural schematic diagram of a loader gearbox output shaft sealing structure.

[0010] Reference numerals: gear 1, bearing 2, oil seal seat assembly 3, sleeve 4, flange 5, nylon nut 6, gasket 7, O-ring 8, output shaft 9. DETAILED DESCRIPTION

[0011] The specific implementation of the loader gearbox output shaft sealing structure of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0012] Figure 1As shown, the utility model loader gearbox output shaft sealing structure comprises a gear 1, a bearing 2, an oil seal seat assembly 3, a sleeve 4, a flange 5, a nylon nut 6, a gasket 7, an O-ring 8, and an output shaft 9; the gear 1 is mounted on the output shaft 9 by spline matching; the outer ring of the bearing 2 is matched with the housing, and the inner ring is fixed on the output shaft 9, and the end face of the bearing 2 is flush with the gear 1; the outer circle of the oil seal seat assembly 3 is provided with two O-rings, and the inner hole is provided with an oil seal; the flange 5 is mounted on the output shaft 9 by spline matching, and the flange 5 is provided with an O-ring 8 in the inner hole close to the right end face, and the flange 5 is locked on the output shaft 9 by using a gasket 7 and a nylon nut 6 through the output shaft thread matching; the inner hole of the sleeve 4 is matched with the output shaft 9, and the outer circle is matched with the oil seal of the oil seal seat assembly 3, and its left end is close to the right end of the bearing 2, and the right end is close to the left end of the flange 5; the outer circle of the oil seal seat assembly 3 is matched with the housing, and the oil seal of the inner hole is matched with the sleeve 4.

[0013] The replacement operation steps of the utility model loader gearbox output shaft seal structure when the seal is not tight are as follows:

[0014] When the oil seal is worn by small sand and gravel, resulting in poor sealing, first use a jackhammer to dismantle the nylon nut 6, take out the gasket 7, O-ring 8, and flange 5; then use a special tool to take out the oil seal seat assembly 3 (including two outer O-rings and inner oil seal) and the shaft sleeve 4, and replace the shaft sleeve 4. This maintenance operation greatly reduces the after-sales maintenance cost of the loader, and has a simple structure, convenient and efficient installation.

Claims

1. A loader gearbox output shaft sealing structure, comprising a gear (1), a bearing (2), an oil seal seat assembly (3), a flange (5), a nylon nut (6), a gasket (7), an O-ring (8), and an output shaft (9); the gear (1) is mounted on the output shaft (9) by spline fitting; the outer ring of the bearing (2) is matched with the housing, the inner ring is fixed on the output shaft (9), and the end face of the bearing (2) is flush with the gear (1); the outer circle of the oil seal seat assembly (3) is provided with two O-rings, and the inner hole is provided with an oil seal; the flange (5) is mounted on the output shaft (9) by spline fitting, the inner hole of the flange (5) near the right end face is provided with an O-ring (8), and the flange (5) is locked on the output shaft (9) by using a gasket (7) and a nylon nut (6) through the output shaft thread fitting; the characteristics are: It also includes a shaft sleeve (4); the inner hole of the shaft sleeve (4) cooperates with the output shaft (9), the outer circle cooperates with the oil seal of the oil seal seat assembly (3), the left end of the shaft sleeve (4) is tightly against the right end of the bearing (2), and the right end is tightly against the left end of the flange (5); the outer circle of the oil seal seat assembly (3) cooperates with the box body, and the oil seal of the inner hole cooperates with the shaft sleeve (4).

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