End face sealing structure of hydraulic torque converter of loading machine

Abstract

The utility model discloses an end face sealing structure of a hydraulic torque converter of a loading machine. The end face sealing structure comprises a nut, a spring washer, a cover wheel, an O-shaped ring, a pump wheel and a bolt. An inner circle limiting spigot boss is arranged on the end face, matched with the pump impeller, of the cover wheel, and the O-shaped ring is installed on an inner circle spigot. A limiting spigot groove is formed in the inner circle of the pump wheel, and a chamfer is arranged at the position, in contact fit with the O-shaped ring, of the pump wheel. The inner circle limiting spigot boss of the cover wheel and the inner circle limiting spigot groove of the pump wheel are matched and ensured to be coaxial, and then the cover wheel and the pump wheel are locked through the nut, the spring washer and the bolt, so that the O-shaped ring and the end face chamfer of the pump wheel form a triangular tight sealing structure. The sealing device is simple and compact in structure, low in manufacturing and maintenance cost, good in sealing effect and reliable to use.

Description

Technical Field

[0001] The utility model relates to the technical field of a hydraulic torque converter for a loader, in particular to an end face sealing structure of a hydraulic torque converter for a loader. Background Art

[0002] The hydraulic torque converter of the loader is one of the key components of the loader's power transmission. It includes a cover wheel, a pump wheel, a turbine and a guide wheel. The hydraulic torque converter is connected to the engine. It can automatically adjust the output torque and speed, so that the loader can automatically change the speed and traction according to the road conditions and the size of the resistance to adapt to the ever-changing various working conditions. Its working principle is: when the engine is started, the crankshaft drives the flywheel to rotate, and the flywheel drives the pump wheel to rotate. The centrifugal force generated by the rotation causes the working fluid between the pump wheel blades to be thrown out from the inner edge to the outer edge along the blade surface. This part of the thrown working fluid impacts the turbine blades and drives the turbine to rotate. The direction of the torque converter oil will change after it flows from the turbine to the guide wheel. When the oil flows back to the pump wheel, its flow direction is the same as the direction of the pump wheel movement, forming a closed-loop oil circuit transmission. After the operation is engaged, the maximum speed from the start to the highest gear can be automatically and continuously changed, with the characteristics of smooth starting and good acceleration performance. When encountering a slope or road obstacle during driving, it can automatically slow down to increase traction and travel at any speed and cross the obstacle without changing gears. When the external resistance decreases, it can quickly and automatically increase the speed to improve the working efficiency. When shoveling materials, it can cut into the pile at a higher speed and automatically slow down to increase the wheel traction as the resistance increases to ensure cutting. Due to the complex working conditions of the torque converter, the sealing of its internal structure is highly required.

[0003] The end face sealing structure of the existing loader torque converter is generally adopted Figure 1 The structure is that a rectangular groove for installing an O-ring 4 is provided on the mating end faces of the cover wheel 3 and the pump wheel 5, and a limit stop boss is provided on the outer circle of the cover wheel 3. The outer circle limit stop is matched with the outer circle of the pump wheel 5 to ensure that the two are coaxial, and then the cover wheel 3 and the pump wheel 5 are locked by bolts 6, and the rubber O-ring 4 installed on the mating end face of the cover wheel 3 is squeezed to seal the mating surface of the cover wheel 3 and the pump wheel 5. The defects of this end face sealing structure are: this sealing structure has high requirements on the flatness and roughness of the end faces of the cover wheel 3 and the pump wheel 5, and when the torque converter rotates at high speed, the sealing performance of the O-ring 4 will be reduced, resulting in excessive oil throwing and poor sealing effect, which reduces the overall transmission efficiency of the hydraulic torque converter. Summary of the invention

[0004] The utility model aims to provide a loader hydraulic torque converter end face sealing structure which has the advantages of simple and compact structure, low manufacturing and maintenance costs, good sealing effect and reliable use.

[0005] To achieve the above purpose, the utility model loader torque converter end face sealing structure comprises a nut 1, a spring washer 2, a cover wheel 3, an O-ring 4, a pump wheel 5 and a bolt 6; the cover wheel 3 is provided with an inner circle limit stop boss on the end face matching with the pump wheel 5, and the O-ring 4 is installed on the inner circle stop; the inner circle of the pump wheel 5 is provided with a limit stop groove, and a chamfer is provided at the contact and matching position with the O-ring 4; the inner circle limit stop boss of the cover wheel 3 is matched with the inner circle limit stop groove of the pump wheel 5 to ensure that the two are coaxial, and then the cover wheel 3 and the pump wheel 5 are locked by the nut 1, the spring washer 2 and the bolt 6, so that the O-ring 4 and the end face chamfer of the pump wheel 5 form a triangular tight sealing structure.

[0006] The utility model loader hydraulic torque converter end face sealing structure has the following characteristics and beneficial effects:

[0007] 1. By changing the outer limit stop boss of the cover wheel in the prior art to an inner limit stop boss, the O-ring is installed on the inner stop, the limit stop groove is processed on the inner circle of the pump wheel, and a chamfer is set at the contact and matching position with the O-ring 4, so that the end chamfer of the O-ring 4 and the pump wheel 5 form a triangle to form a tight seal, and the sealing effect is good;

[0008] 2. The structure is simple and compact, the production and maintenance costs are low, the sealing effect is good, and the use is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The invention is a cross-sectional schematic diagram of the end face sealing structure of a hydraulic torque converter of a loader in the prior art.

[0010] Figure 2 The utility model is a cross-sectional schematic diagram of the end face sealing structure of the hydraulic torque converter of a loader.

[0011] Reference numerals: nut 1, spring washer 2, cover wheel 3, O-ring 4, pump wheel 5, bolt 6. DETAILED DESCRIPTION

[0012] The specific implementation of the end face sealing structure of the torque converter of a loader according to the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] Figure 2 As shown, the utility model loader torque converter end face sealing structure comprises a nut 1, a spring washer 2, a cover wheel 3, an O-ring 4, a pump wheel 5 and a bolt 6; the cover wheel 3 is provided with an inner circle limit stop boss on the end face matching with the pump wheel 5, and the O-ring 4 is installed on the inner circle stop; the inner circle of the pump wheel 5 is provided with a limit stop groove, and a chamfer is provided at the contact and matching position with the O-ring 4; the inner circle limit stop boss of the cover wheel 3 is matched with the inner circle limit stop groove of the pump wheel 5 to ensure that the two are coaxial, and then the cover wheel 3 and the pump wheel 5 are locked by the nut 1, the spring washer 2 and the bolt 6, so that the O-ring 4 and the end face chamfer of the pump wheel 5 form a triangular tight sealing structure.

[0014] During assembly, first install the O-ring 4 on the limit stop of the cover wheel to form a cover wheel assembly, then match the inner circle limit stop of the cover wheel assembly with the inner circle of the pump wheel 5 and ensure that the two are coaxial, the matching end face of the cover wheel 3 is tightly fitted with the matching end face of the pump wheel 5, and then the cover wheel 3 and the pump wheel 5 are locked by the nut 1, the spring washer 2 and the bolt 6. At this time, the end face chamfers of the O-ring 4 and the pump wheel 5 form a triangle and a tight seal, and the inner and outer stoppers are matched close to the inside, so that the torque converter is not easy to throw out the oil during high-speed rotation, reducing the amount of oil unloading to ensure the pressure of the transmission system.

Claims

1. A loader torque converter end face sealing structure, comprising a nut (1), a spring washer (2), a cover wheel (3), an O-ring (4), a pump wheel (5) and a bolt (6); wherein: The cover wheel (3) is provided with an inner circle stop boss on the end face matching with the pump wheel (5), and the O-ring (4) is installed on the inner circle stop; the inner circle of the pump wheel (5) is provided with a stop groove, and a chamfer is provided at the contact and matching position with the O-ring (4); the inner circle stop boss of the cover wheel (3) is matched with the inner circle stop groove of the pump wheel (5) to ensure that the two are coaxial, and then the cover wheel (3) and the pump wheel (5) are locked by nuts (1), spring washers (2) and bolts (6), so that the O-ring (4) and the end face chamfer of the pump wheel (5) form a triangular tight sealing structure.

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