CN1609435A - Screw expanding spring double-leaf combined piston ring for internal combustion engine - Google Patents

Abstract

The combined piston ring with staying spring for internal combustion engine contains upper ring, low ring and spiral staying spring, which is installed inside the staying spring slot the upper ring and the low ring form. After the combined ring is installed, the spiral staying spring applies one force to each of the upper ring and the low ring, and the force has a radial component to increase the specific pressure of the ring to the cylinder wall and raise oil scraping capacity and an axial component to raise the sealing of the ring and prevent the axial motion of the ring. Compared with common spiral oil ring with staying spring, the combined piston ring of the present invention has small friction force. powerful oil scraping capacity, no 'oil pumping' effect and excellent sealing to the gas inside the cylinder.

Description

Internal-combustion engine helical supporting spring biplate compound piston ring

(1) technical field

The present invention relates to the piston ring group in the internal-combustion engines crank-connecting rod mechanism, be specially adapted to the compound piston ring of quartastroke engine.

(2) technical background

What existing internal-combustion engine piston ring extensively adopted is two to three road compression rings, the ring group structure of one helical supporting spring oil ring.When work, oil ring moving axially in piston ring groove is easy to generate " pump oil " effect, and at this moment machine oil causes engine oil consumption to rise by scurrying to the firing chamber on the sideshake between piston ring and the piston ring groove.Because the twice scraping land of helical supporting spring oil ring is on the same ring body, the per pass scraping land can not be done radial motion separately during work, make oil ring have only last scraping land to play knife-type oil stripping action, and scraping land is less to the engine oil consumption influence down, but has increased the surface friction drag of internal-combustion engine.In addition, eight to 12 spill ports that on helical supporting spring oil ring ring body, distributing usually, these spill ports have not only increased the manufacturing difficulty of oil ring, and have reduced ring body intensity, make the oil ring body occur the phenomenon that fractures easily when installing and work.

(3) summary of the invention

The object of the present invention is to provide a kind of new-type compound piston ring, the ring body of this compound piston ring is divided into upper ring body and lower ring body, and upper and lower ring body respectively has scraping land one.The characteristics of utilizing upper ring body and lower ring body to work simultaneously reach the purpose that improves this associative ring sealing, frizing and heat-transfer capability.

Compound piston ring of the present invention is made up of a slice upper ring body, a slice lower ring body, helical supporting spring and support spring rod bolt.Described helical supporting spring connects two ends by a support spring rod bolt, forms a circle shape spring body.After the compound piston ring of the present invention installation, the upper side plane of upper ring body is pressed on the piston ring groove on the plane by helical supporting spring, and the following side plane of lower ring body is pressed on the piston ring groove lower plane by helical supporting spring; Support spring groove of the common composition of the downside of this compound piston ring upper ring body and the upper side of lower ring body, circular helical supporting spring promptly is pressed in this support spring groove by upper ring body and lower ring body.Helical supporting spring after the compression applies a reaction force respectively to upper ring body and lower ring body.The radial component of this reaction force is pressed on the periphery of upper ring body and lower ring body on the cylinder jacket wall, and axial thrust load then struts upper ring body and lower ring body, and upper and lower ring body is pressed on respectively on the piston ring groove on the plane and piston ring groove lower plane.Therefore, the radial component that helical supporting spring applies has improved the pressure of upper and lower ring body to cylinder wall, strengthens the frizing ability; The axial thrust load that helical supporting spring applies has improved the pressure of upper and lower ring body to the upper and lower plane of piston ring groove, and stops moving axially of ring body.

In compound piston ring of the present invention, the transverse shape of support spring groove has material impact to the axial thrust load that helical supporting spring imposes on upper and lower ring body.When designing the transverse shape of support spring groove, guarantee the tangent line of helical supporting spring and upper ring body point of contact and the angle γ of upper ring body upper side plane ₁Value in 0 ° to 60 ° scope; The angle γ of side plane under the tangent line of helical supporting spring and lower ring body point of contact and the lower ring body ₂Also should be in 0 ° to 60 ° scope value; And γ ₁With γ ₂Sum should be in 30 ° to 90 ° scopes value.The transverse shape of support spring groove is V-shaped or U type structure usually.

When compound piston ring of the present invention was subjected to the bigger responsive to axial force of in-cylinder combustion gas, upper and lower ring body can produce axial displacement, and excessive for preventing axial displacement, this compound piston ring will be determined the minimum axial direction size.During design, determine that the method for minimum axial direction size has two kinds, first kind is the minimum axial direction size of determining compound piston ring with the maximal axial extension sum of the maximal axial extension of upper ring body and lower ring body.Second kind is in the minimum axial direction size at support spring groove place, the minimum axial direction size that lower ring body is determined compound piston ring in the minimum axial direction size and the support spring external diameter three sum at support spring groove place with upper ring body.The upper and lower ring body of first method manufacturing is more or less freely, but upper and lower ring body axial dimension is bigger, low speed internal-combustion engine in being applicable to; The upper and lower ring body axial dimension of second method is less, is applicable to the high speed internal-combustion engine.

Its upper and lower ring body of compound piston ring of the present invention can adopt made such as alloy cast iron, spheroidal graphite cast iron and steel, and its outer surface can adopt measure raising wear resistancies such as chromium plating.

(4) description of drawings

Fig. 1 is the plan view of compound piston ring of the present invention;

When the support spring groove that Fig. 2 forms for upper and lower ring body among Fig. 1 is the U type, the A-A sectional view of amplification;

Fig. 3 is upper and lower ring body is formed among Fig. 1 support spring groove when V-shaped, the A-A sectional view of amplification.

Among the figure: 1 is that upper ring body, 2 is that lower ring body, 3 is that helical supporting spring, 4 is the support spring rod bolt.γ ₁Be the tangent line of helical supporting spring and upper ring body point of contact and the angle of upper ring body upper side plane, γ ₂Angle for side plane under the tangent line of helical supporting spring and lower ring body point of contact and the lower ring body; F ₁, F ₂Be respectively helical supporting spring and be applied to positive pressure on the upper and lower ring body; Δ is the end-gaps of upper ring body.

(5) embodiment

Describe specific embodiments of the present invention and working principle in detail below with reference to above-mentioned accompanying drawing.

In upper ring body 1 shown in Fig. 1, Fig. 2 and Fig. 3, lower ring body 2, helical supporting spring 3 and the support spring rod bolt 4 installation backs position relation in piston ring groove.Installation rear screw support spring 3 is subjected to the compression of upper ring body 1 and lower ring body 2, and upper and lower ring body is applied a positive pressure F respectively ₁And F ₂Power F ₁Radial component and self elastic force of upper ring body 1 periphery of upper ring body 1 is pressed on the cylinder sleeve wall, form sealing and scrape pasta; Power F ₁Axial thrust load the upper side plane of upper ring body is pressed on the piston ring groove on the plane, stop moving axially of upper ring body, and form sealing surface.In like manner, power F ₂Radial component and self elastic force of lower ring body 2 periphery of lower ring body 2 is pressed on the cylinder sleeve wall, form sealing and scrape pasta; Power F ₂Axial thrust load the following side plane of lower ring body 2 is pressed on the piston ring groove lower plane, stop moving axially of lower ring body, and form sealing surface.Obviously, the tangent direction and the power F of helical supporting spring 3 and upper ring body 1 point of contact ₁Direction vertical, the tangent direction and the power F of helical supporting spring 3 and lower ring body 2 point of contact ₂Direction vertical.Can change power F by the position that changes helical supporting spring 3 and upper ring body 1 or lower ring body 2 point of contact ₁Or power F ₂Direction, thereby change the size be applied to the axial force on upper ring body 1 or the lower ring body 2, improving the sealing on upper and lower ring body and the upper and lower plane of piston ring groove, and stop moving axially of upper and lower ring body.During design support spring groove, guarantee γ ₁And γ ₂Span be: 0 °≤γ ₁≤ 60 °, 0 °≤γ ₂≤ 60 °, and 30 °≤γ ₁+ γ ₂≤ 90 °.

The minimum axial direction size of compound piston ring is the maximal axial extension H by upper ring body among Fig. 2 ₁Maximal axial extension H with lower ring body ₂Sum is determined.The minimum axial direction size of compound piston ring is by the minimum axial direction size h of upper ring body at support spring groove place among Fig. 3 ₁, lower ring body is at the minimum axial direction size h at support spring groove place ₂Determine with support spring external diameter three sum.When compound piston ring of the present invention was installed, the opening of upper and lower ring body will stagger, and the angle that staggers is greater than 60 °.

Compare with common helical supporting spring oil ring, multipiece ring of the present invention has strengthened gas in the jar Sealability, to the frizing ability of cylinder sleeve wall with to the heat-transfer capability of piston. Therefore of the present invention Multipiece ring has following characteristics:

(1) upper ring body and lower ring body can be done separately radial motion, and be good to the distortion adaptability of cylinder sleeve wall, Strengthen the frizing ability of piston ring, and can stop upper ring body and lower ring body generation to move axially, reduced internal combustion Machine consumption of lubricating oil, minimizing exhaust pollution.

(2) axial thrust load of helical supporting spring is pressed on upper and lower ring body respectively the upper and lower plane of piston ring groove On, improved exponentially the heat-transfer capability of piston ring.

(3) upper ring body separately with piston ring groove on plane, cylinder sleeve wall form and seal oil-scraper face, lower ring body is also Independent and piston ring groove lower plane, cylinder sleeve wall form the sealing oil-scraper face. Associative ring therefore of the present invention simultaneously Effect with sealing gas and frizing.

Claims (3)

1, a kind of internal-combustion engine helical supporting spring biplate compound piston ring, comprise a slice upper ring body, a slice lower ring body and a helical supporting spring, it is characterized in that the upper side of upper ring body and the downside of lower ring body all are the planes, and the common support spring groove of forming of upper ring body and lower ring body, helical supporting spring promptly is arranged in this support spring groove.

2, compound piston ring according to claim 1 is characterized in that the minimum axial direction size of compound piston ring or equals upper ring body and the maximal axial extension sum of lower ring body; Perhaps equal upper ring body in the minimum axial direction size at support spring groove place, lower ring body minimum axial direction size and helical supporting spring external diameter three sum at support spring groove place.

3, compound piston ring according to claim 1 is characterized in that the transverse shape of support spring groove makes the tangent line of helical supporting spring and upper ring body point of contact and the angle γ of upper ring body upper side plane ₁, the angle γ of side plane under the tangent line of helical supporting spring and lower ring body point of contact and the lower ring body ₂Value satisfy following condition: 0 °≤γ ₁≤ 60 °, 0 °≤γ ₂≤ 60 °, and 30 °≤γ ₁+ γ ₂≤ 90 °.

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