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Piston ring and method for manufacturing a piston ring

A technology of piston ring and piston ring matrix, which is applied in the field of piston rings, can solve the problems of increasing workload and cost, and achieve the effect of preventing degradation

Pending Publication Date: 2021-01-01
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cutting chamfers on each ring increases effort and expense during production

Method used

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  • Piston ring and method for manufacturing a piston ring
  • Piston ring and method for manufacturing a piston ring
  • Piston ring and method for manufacturing a piston ring

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Effect test

Embodiment Construction

[0025] Referring now to the accompanying drawings in detail, figure 1 A piston ring 10 according to the invention is shown. The ring 10 has a front surface 11 , a top surface 12 and a gap 13 . The front surface 11 is treated by grit blasting, typically by sand grains of various sizes, to produce a surface with a series of peaks 14 and valleys 15, such as figure 2 and image 3 shown. Coating 20 is applied to the blasted surface to the desired depth via physical vapor deposition (PVD). Peaks 24 and valleys 25 are also in the coating. Then, if image 3 As shown, peaks 24 of the coating are cut away via a grinding process to form plateaus 26 separated by valleys 25 . By finding the optimum grit combination and blasting angle, the piston rings of the present invention can be manufactured to exhibit high durability during high pressure situations and also exhibit high lubricity due to the porosity of the coating. The coating allows further geometric changes to the ring gap t...

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Abstract

An unchamfered piston ring that is pre-treated by grit blasting to a defined roughness, followed by PVD coating with a metal nitride to a thickness of at least 10pm, leaving peaks and valleys in the coated piston ring. The coated piston ring is then lapped to remove the peaks without penetrating the coating, so that valleys and plateaus remain in the coated surface. The resulting piston ring exhibits superior coating retention due to the increased surface area created by the grit blasting, and yet also superior performance, as the cavities remaining increase the porosity of the coating and thus enhance the lubrication of the ring.

Description

technical field [0001] The present invention relates to a piston ring which is coated by a deposition process, usually with a metal nitride coating. In particular, the present invention relates to a non-chamfered piston ring which is pretreated by sandblasting to roughen the face and surface of the ring and then coated via PVD treatment There are metal nitride coatings or other coatings. Pretreatment increases the adhesion of the coating to prevent chipping and spalling during high pressure events such as LSPI (Low Speed ​​Pre-Ignition). The new treatment allows the ring not to be chamfered, as the additional adhesion of the coating reduces the risk of the edge of the ring chipping at the ring gap. By eliminating chamfers, additional processing steps are eliminated and piston rings can be manufactured faster and more economically. In addition, the reduced area of ​​the ring gap that is not chamfered leads to a reduction in blowby and reduces fuel consumption due to the smal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/02C23C14/58F16J9/26C23C14/06
CPCC23C14/028C23C14/588F16J9/26C23C14/0641C23C14/0605C23C14/5886B23P15/06C23C14/0611F16J9/20F16J9/22
Inventor 亚历山大·S·库珀托马斯·J·史密斯托马斯·斯通安德烈·C·保罗
Owner MAHLE INT GMBH