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Piston ring of automobile hydraulic assistance steering device

A technology of hydraulic power steering and piston ring, which is applied to power steering mechanism, steering mechanism, fluid steering mechanism, etc., can solve the problems of power drop of hydraulic power steering system, increase of leakage of hydraulic power steering gear, wear of inner wall of oil cylinder, etc. The effect of quality improvement, low friction, and avoidance of excessive wear

Inactive Publication Date: 2017-10-20
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low hardness of the cylinder made of aluminum alloy, if this kind of piston ring is used, the inner wall of the cylinder will wear faster, resulting in increased leakage in the hydraulic power steering, which in turn will cause the power assist of the hydraulic power steering system to decrease, resulting in steering failure. heavy

Method used

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  • Piston ring of automobile hydraulic assistance steering device
  • Piston ring of automobile hydraulic assistance steering device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Manufacturing of automotive hydraulic power steering piston rings using the following material composition:

[0028] Content name

Composition ratio (weight percent)

PTFE

65％

carbon fiber

18％

graphite

14％

Molybdenum disulfide

3％

[0029] The grain size of the polytetrafluoroethylene material mentioned in the above table is above 220 mesh, the purity is 99%, the tensile strength is 30-35Mpa, the carbon fiber is selected with a grain size of 300 mesh, the aspect ratio is about 8:1, and the purity is 99 % PAN-based carbon fiber; the particle size of graphite is 320 mesh, the particle size of molybdenum disulfide is 300 mesh, and the purity is 99%.

[0030] The above components are made into piston rings according to injection molding process steps such as batching-mixing-filling-holding pressure-cooling-demolding.

[0031] The piston ring was assembled on the hydraulic power steering gear of a certain model to carry...

Embodiment 2

[0034] Manufacturing of automotive hydraulic power steering piston rings using the following material composition:

[0035]

[0036]

[0037] The PTFE material mentioned in the above table has a grain size above 220 mesh, a purity of 99%, a tensile strength of 20-25Mpa, and a carbon fiber with a grain size of 200 mesh, an aspect ratio of 5:1, and a purity of 99%. PAN-based carbon fiber; the particle size of graphite is 250 mesh, the particle size of molybdenum disulfide is 300 mesh, and the purity is 99%.

[0038] The above materials are made into piston rings according to the injection molding process steps such as batching-mixing-filling-pressure holding-cooling-demolding.

[0039] The piston ring was assembled on the hydraulic power steering gear of a certain model to carry out corresponding experiments, and the friction force was detected to be 115N, while the friction force of the original piston ring was about 150N. The hydraulic power steering gear was mounted on...

Embodiment 3

[0041] Manufacturing of automotive hydraulic power steering piston rings using the following material composition:

[0042] Content name

Composition ratio (weight percent)

PTFE

69％

carbon fiber

20％

graphite

10％

Molybdenum disulfide

1％

[0043] The PTFE material mentioned in the above table has a grain size above 220 mesh, a purity of 99%, a tensile strength of 25-30Mpa, and a carbon fiber with a grain size of 400 mesh, an aspect ratio of 10:1, and a purity of 99%. PAN-based carbon fiber; the particle size of graphite is 300 mesh, the particle size of molybdenum disulfide is 300 mesh, and the purity is 99%.

[0044] The above materials are made into piston rings according to the injection molding process steps such as batching-mixing-filling-pressure holding-cooling-demolding.

[0045] The corresponding experiment was carried out by assembling the piston ring on the hydraulic power steering gear of a certain model, and ...

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Abstract

The invention discloses a piston ring of an automobile hydraulic assistance steering device. The piston ring of the automobile hydraulic assistance steering device comprises, by mass, 60%-70% of polytetrafluoroethylene, 15%-20% of carbon fiber, 10%-15% of graphite and 1%-5% of lubricant. According to the injection molding technological process, the piston ring is manufactured through the technological steps of sequentially conducting ingredient preparation, mixing, filling, pressure maintaining, cooling and demolding on the ingredients. By the adoption of the piston ring, the automobile hydraulic assistance steering device can be resistant to high pressure, low in friction and long in service life, and the fault that due to the fact that the inner wall of an oil cylinder is worn too rapidly, leakage in the steering device is increased, and then steering is hard can be effectively avoided.

Description

technical field [0001] The invention belongs to the technical field of an automobile rack and pinion steering gear, and in particular relates to a piston ring of an automobile hydraulic power steering gear. Background technique [0002] The hydraulic power steering system is a common configuration of automobiles. It drives the steering oil pump through the engine. The steering oil pump sucks the steering oil and discharges high-pressure oil to the power steering cylinder. The piston drives the rack to provide power, and the rack transmits the power to the wheels through the tie rod. , so as to realize the power steering of the vehicle. [0003] The piston ring is an important part in the cylinder of the hydraulic power steering. It has an interference fit with the inner wall of the cylinder. There is an O-ring between the piston ring and the piston. The steering oil will enter the gap between the cylinder and the piston, and will squeeze the O-ring and the piston ring, caus...

Claims

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Application Information

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IPC IPC(8): F04B53/02B62D5/12
CPCB62D5/063B62D5/12F04B53/02
Inventor 刘慧建伍和龙黄伟章余发高家兵
Owner CHERY AUTOMOBILE CO LTD
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