Sealing ring structure of fixed shaft type gearbox of loading machine

Abstract

The utility model discloses a sealing ring structure of a fixed shaft type gearbox of a loading machine. One end of a shaft is supported on a shaft sleeve hole of an oil inlet end cover through a shaft sleeve, and the shaft sleeve is in interference fit with the oil inlet end cover. An oil inlet hole is formed in the oil inlet end cover; annular oil grooves and radial through holes are formed in the shaft sleeve; an annular oil groove, a radial through oil hole, an axial oil hole and two sealing ring grooves are formed in the shaft, and the annular oil groove and the radial through oil hole are communicated with the axial oil hole; the shaft sleeve is in clearance fit with the shaft; a closed space is formed among the sealing rings arranged on the two sides of the shaft annular oil groove, the shaft sleeve and the shaft; the screwed plug is assembled on the right side of the axial oil hole of the shaft; the two sealing rings are of a closed full-circle structure and are assembled in the two sealing ring grooves of the shaft. The sealing ring is simple and compact in structure, low in manufacturing and maintenance cost and reliable in sealing performance, and solves the problem that a friction plate of a clutch is burnt out due to the fact that the sealing performance is affected by contraction deformation of a lap-joint type sealing ring of a fixed-shaft gearbox in the prior art in a low-temperature environment.

Description

Technical Field

[0001] The utility model relates to the technical field of a loader gearbox assembly, in particular to a sealing ring structure of a loader fixed-axis gearbox. Background Art

[0002] Wheel loaders play a very important role in the development of infrastructure at home and abroad. With the gradual development of wheel loader technology at home and abroad, the gearbox, as the core component of the loader transmission, has basically formed two schools: planetary gearbox and fixed-axis gearbox. Among them, the fixed-axis gearbox has always occupied a stable share in the wheel loader market due to its reliable structure and high transmission efficiency. The gear sealing ring of the existing loader fixed-axis gearbox generally adopts a non-closed circle overlapping structure, which has the defect that during the winter in high-cold areas, the overlapping sealing ring is affected by the temperature, and the overlapping sealing ring shrinks and deforms due to thermal expansion and contraction, which affects its sealing performance, makes the gear oil pressure low, and causes the clutch friction plate to burn out. Summary of the invention

[0003] The utility model aims to provide a loader fixed-axis gearbox sealing ring structure with simple and compact structure, low manufacturing and maintenance costs and reliable sealing performance, so as to solve the problem that the fixed-axis gearbox overlapping sealing ring of the prior art shrinks and deforms in a low-temperature environment, thereby affecting the sealing performance and causing the clutch friction plate to burn out.

[0004] In order to solve the shrinkage problem of the overlapping sealing ring in the prior art, it is verified through analysis that the sealing ring with a closed circular structure is less affected by temperature and shrinks less in a low temperature environment, thereby ensuring good sealing performance. This can effectively solve the problem that the overlapping sealing ring in the prior art shrinks in a low temperature environment, affecting the sealing performance and causing the clutch friction plate to burn out.

[0005] In order to achieve the above purpose, the utility model loader fixed shaft type gearbox sealing ring structure comprises an oil inlet cover 1, a sleeve 2, a shaft 3, a plug 4 and a sealing ring 5, one end of the shaft 3 is supported on the sleeve hole of the oil inlet cover 1 through the sleeve 2, and an interference fit is adopted between the sleeve 2 and the oil inlet cover 1; the oil inlet cover 1 is provided with an oil inlet hole 1.1; the sleeve 2 is provided with an annular oil groove 2.1 and a radial through hole 2.2; the shaft 3 is provided with an annular oil groove 3.1, a radial through oil hole 3.2, an axial oil hole 3.3 and two sealing ring grooves 3.4, the annular oil groove 3.1 and the radial through oil hole 3.2 are connected with the axial oil hole 3.3; the sleeve 2 and the shaft 3 are clearance-fitted, and the sealing rings 5 ​​arranged on both sides of the annular oil groove 3.1 of the shaft 3 form an effective closed space between the sleeve 2 and the shaft 3; the wire plug 4 is assembled on the right side of the axial oil hole 3.3 of the shaft 3; the sealing ring 5 is a closed full-circle structure, and two sealing rings 5 ​​are provided, which are respectively assembled in the two sealing ring grooves 3.4 of the shaft 3 by using special tooling.

[0006] When the gearbox is in driving gear, the pressure oil flows from the oil inlet hole 1.1 of the oil inlet cover 1 to the annular oil groove 2.1 of the sleeve 2, then flows through the radial through hole 2.2 of the sleeve 2 to the annular oil groove 3.1 of the shaft 3, and then passes through the axial oil hole 3.3 of the shaft 3 to reach the inside of the clutch.

[0007] The utility model of the loader fixed-axis gearbox sealing ring structure has the following technical characteristics and beneficial effects:

[0008] 1. By adopting a closed circular sealing ring, the problem that the overlapping sealing ring of the prior art shrinks in a low temperature environment, thus affecting the sealing performance and causing the clutch friction plate to burn out can be effectively solved;

[0009] 2. Simple and compact structure, low manufacturing and maintenance costs, and reliable sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The utility model is a main cross-sectional schematic diagram of a sealing ring structure of a fixed-axis gearbox of a loader.

[0011] Figure 2 yes Figure 1 Schematic diagram of the middle sealing ring structure.

[0012] Figure numerals: oil inlet cover 1, shaft sleeve 2, shaft 3, screw plug 4, sealing ring 5, oil inlet hole 1.1, annular oil groove 2.1, radial through hole 2.2, annular oil groove 3.1, radial through oil hole 3.2, axial oil hole 3.3, sealing ring groove 3.4. DETAILED DESCRIPTION

[0013] The specific implementation of the fixed-axis gearbox sealing ring structure for a loader of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0014] Figure 1-Figure 2As shown, the utility model loader fixed shaft type gearbox sealing ring structure comprises an oil inlet cover 1, a shaft sleeve 2, a shaft 3, a plug 4 and a sealing ring 5. One end of the shaft 3 is supported on the shaft sleeve hole of the oil inlet cover 1 through the shaft sleeve 2, and an interference fit is adopted between the shaft sleeve 2 and the oil inlet cover 1; the oil inlet cover 1 is provided with an oil inlet hole 1.1; the shaft sleeve 2 is provided with an annular oil groove 2.1 and a radial through hole 2.2; the shaft 3 is provided with an annular oil groove 3.1, a radial through oil hole 3.2, and an axial oil hole 3. 3 and two sealing ring grooves 3.4, the annular oil groove 3.1 and the radial through oil hole 3.2 are connected with the axial oil hole 3.3; the sleeve 2 and the shaft 3 are clearance-fitted, and the sealing rings 5 ​​arranged on both sides of the annular oil groove 3.1 of the shaft 3 form an effective closed space between the sleeve 2 and the shaft 3; the wire plug 4 is assembled on the right side of the axial oil hole 3.3 of the shaft 3; the sealing ring 5 is a closed full-circle structure, and two sealing rings 5 ​​are provided, which are respectively assembled in the two sealing ring grooves 3.4 of the shaft 3 by using special tooling.

[0015] The utility model discloses a sealing ring structure for a loader fixed-axis gearbox, which has a simple and compact structure, low manufacturing and maintenance costs, and reliable sealing performance, and effectively solves the problem that the overlapping sealing rings in the prior art shrink in a low temperature environment, thereby affecting the sealing performance and causing the clutch friction plate to burn out.

Claims

1. A sealing ring structure of a fixed-axis gearbox of a loader, comprising an oil inlet cover (1), a shaft sleeve (2), a shaft (3), a plug (4) and a sealing ring (5); one end of the shaft (3) is supported on the shaft sleeve hole of the oil inlet cover (1) through the shaft sleeve (2); an interference fit is adopted between the shaft sleeve (2) and the oil inlet cover (1); the oil inlet cover (1) is provided with an oil inlet hole (1.1); the shaft sleeve (2) is provided with an annular oil groove (2.1) and a radial through hole (2.2); the shaft (3) is provided with an annular oil groove (3.1), a radial through oil hole (3.2), an axial oil hole (3.3) and two sealing ring grooves (3.4), the annular oil groove (3.1) and the radial through oil hole (3.2) are connected with the axial oil hole (3.3); the shaft sleeve (2) and the shaft (3) are clearance-matched, and the sealing rings (5) arranged on both sides of the annular oil groove (3.1) of the shaft (3) and the shaft sleeve (2) and the shaft (3) form an effective closed space; the thread plug (4) is assembled on the right side of the axial oil hole (3.3) of the shaft (3); the characteristics are: The sealing ring (5) is a closed full-circle structure. Two sealing rings (5) are provided and are respectively assembled in two sealing ring grooves (3.4) of the shaft (3) using special tooling.

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