• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An exhaust port intended to reduce noise, improve fuel economy and produce a rotary charge movement in the cylinder upon commencement of a compression stroke has a convex upper wall 10 which at its boundary 9 with cylinder 2 forms an angle of not more than 30 DEG with the longitudinal axis of the cylinder. The outer side wall 17 of the port when viewed in the section of Fig. 2 forms an angle of 60 DEG or less with the transverse cylinder axis 18. The port is opened progressively as a function of the piston stroke and has a cross-section which does not change abruptly in the direction of gas flow from the cylinder. <IMAGE>
    公开号:SU1717856A1
    申请号:SU877774484
    申请日:1987-04-06
    公开日:1992-03-07
    发明作者:Удо Катцула；Волфрам Гербит
    申请人:Феб Фарцойг-Унд Ягдварффенверк "Эрнст Тельман" (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to a two-stroke internal combustion engine and can be applied to motorcycle engines in which for the entire range of speed and loads a reduction in exhaust noise, improved gas exchange and charge movement in the cylinder around its longitudinal axis at the beginning of the compression phase should be achieved.
    In the patent of the GDR No. 248169, class. F 02 B 25/00, published. 1987, due to the inclined arrangement of the outlet channel, the ratio of the opening area of the outlet window opened by the piston to the channel cross-sectional area remains almost constant. Opportunities for creating a rotational motion of a charge in a cylinder around its longitudinal axis due to the corresponding location of the outlet channel are not used.
    The aim of the invention is to reduce exhaust noise in combination with a time-dependent pressure dependence of the pressure in the exhaust channel and providing rotational movement of the charge around the longitudinal axis of the cylinder at the beginning of the compression phase in order to combine the combustible mixture.
    The objective of the invention is to prevent sudden expansion of exhaust gases in the exhaust channel and, without using additional details, to achieve such a pressure dependence on time in the exhaust channel at which gas exchange is improved, as well as to use the kinetic energy of the shock wave returning to the cylinder to create a rotational the movement of the charge around the longitudinal axis of the cylinder at the beginning of the compression phase.
    The outer side wall of the outlet channel is located with respect to the transverse axis of the cylinder at an acute angle formed from the side of the outlet channel. In addition, the exhaust window at the outer side wall is made with lateral expansion combined with the expansion at the upper wall of the channel.
    The lateral expansion generatrix is located tangent to the inner surface of the cylinder liner and at an angle to the transverse axis of the cylinder, smaller than the angle formed by the latter with the outer side wall.
    The lower-restriction of the outlet window is located below the upper reporting edge of the piston at its bottom dead center position.
    Due to this arrangement and arrangement of the exhaust channel in two-stroke internal combustion engines with valveless gas distribution, the process of expansion of exhaust gases in the exhaust channel is stretched over time ^ such a dependence of pressure on time is provided that gas exchange efficiency increases and rotational charge movement in the cylinder is created due to the use of kinetic energy reverse shock wave.
    Since the known device of the exhaust channel does not increase the resistance to flow and does not require a significant advance in the beginning of the opening of the outlet, the proposed device extends to engines of high specific power, the exhaust noise of which should be reduced in combination with a significant reduction in fuel consumption.
    Figure 1 shows a cylinder of a two-pin internal combustion engine, a longitudinal section; figure 2 is a section aa in figure 1; in Fig.3 is a view of B in Fig.2.
    In the cylinder housing 1 there is a sleeve 2 with a lip 3 of the sleeve. An inlet window 4 located in the cylinder liner 2 connects the inlet channel 5 to the engine crank chamber, while at least one bypass window 6 connects the crank chamber to the combustion chamber. The exhaust window 7 connects the combustion chamber to the exhaust channel 8.
    The exhaust channel 8 is adjacent to the upper restriction 9 of the exhaust window 7 in the direction of the exhaust gas flow. The upper wall 10 of which is convexly curved and forms a uniform, non-linear expansion of the exhaust channel in the place with the inner 16 and outer 17 side walls
    8.
    The lower restriction 11 of the outlet window 7 is located under the upper cut-off edge of the piston 12. At the bottom dead center. The lower restriction 11 of the outlet window 7 is adjacent to the lower wall 13 of the channel, which has a rectilinear shape. The piston 12 together with the upper wall 10 of the channel, the outer side wall 17 and the lower wall 13 of the channel forms an expansion section, the cross section of which changes near the outlet window by the piston 12 depending on its stroke. The position of the upper wall 10 of the channel is such that at the upper limit 9 of the outlet window 7, it forms an angle to the longitudinal axis of the cylinder not exceeding 30 °. The outer side wall 17 forms an angle of not more than 60 ° with the transverse axis 18 of the cylinder. The axis 14 of the exhaust channel 8, in the immediate vicinity of its entrance 15 into the combustion chamber, forms an angle of the order of 0 ° with the longitudinal axis of the cylinder and an angle of about 60 ° with the transverse axis of 18. The outlet window 7 can expand at the upper wall 10 of the channel and the outer side wall 17 of the channel beyond the top 'expansion at the upper wall of the channel, about l
    I and the fact that the outer side wall 17 of the channel 8 is located in relation to the transverse axis 18 of the cylinder at an acute angle formed from the side of the outlet window 7.
    Its lateral restriction 19 is usually a rectangular I-section of the outlet window. The lateral extension 20 thus comes almost tangentially into the inner side '10 of the cylinder liner 2 and forms a smaller angle with respect to the transverse axis 18 of the cylinder than the outer side wall 17.
    权利要求:
    Claims (4)
    [1]
    Claim
    [2]
    2. The engine according to claim 1, characterized in that the exhaust window 7 at the outer side wall 17 is made with a lateral extension 20, combined with the extension at the upper wall 10.
    [3]
    3. The engine according to claims 1. and 2, about t and h and y-
    The formula of the invention is that the generatrix of the lateral
    1. The two-stroke engine of internal 15, extension 20 is located on the tangent-combustion. comprising at least one cylinder, in the sleeve of which the piston is arranged for reciprocating movement and is configured to periodically shut off the inlet window, at least one bypass window and an outlet window periodically in communication with the outlet channel. formed by the walls, and having a cylinder liner 2 adjacent to the inner surface and at an angle to the transverse axis 18 of the cylinder smaller than the angle formed by the latter with the outer side wall 17.
    [4]
    4. The engine according to claims 1 to 3, characterized in that the lower restriction 11 of the exhaust window 7 is located below the upper cut-off edge of the piston 12 at its position at bottom dead center.
    类似技术:
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    US7389755B2|2008-06-24|Tandem-piston engine
    US4307687A|1981-12-29|Internal combustion engines
    US5203288A|1993-04-20|Two-stroke internal combustion engines with a compression-ignition of diesel type
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    SU1717856A1|1992-03-07|Two-stroke internal combustion engine
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    GB2149006A|1985-06-05|Engine and compressor valve gear
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    SU947449A1|1982-07-30|Combustion chamber
    同族专利:
    公开号 | 公开日
    FR2597924A1|1987-10-30|
    GB8704863D0|1987-04-08|
    DE3702193A1|1987-10-29|
    CS255987A1|1989-05-12|
    FR2597924B1|1989-12-22|
    GB2189839A|1987-11-04|
    DD260410A3|1988-09-28|
    GB2189839B|1990-07-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB270225A|1926-01-25|1927-04-25|David Mccrorie Shannon|Improvements in internal combustion engines|
    GB457304A|1935-03-28|1936-11-25|Audi Ag|Improvements in and relating to the scavenging of the cylinders of two-stroke internal combustion engines|
    GB549900A|1942-04-14|1942-12-14|Nydqvist & Holm Akticbolag|Improvements in two-stroke cycle internal combustion engines|
    GB618745A|1946-11-28|1949-02-25|Warsop Petrol Drill & Tools Lt|Improvements relating to percussive tools operated by internal combustion of gases|
    GB730348A|1953-05-11|1955-05-18|Johann List|Two-stroke internal-combustion engine|
    GB1529925A|1976-01-17|1978-10-25|Textron Inc|Exhaust port of two-stroke engines|
    JPS6232345B2|1979-09-27|1987-07-14|Yamaha Motor Co Ltd|
    DE3430477A1|1984-08-04|1986-02-13|Sachs Systemtechnik Gmbh, 8720 Schweinfurt|High-speed two-stroke internal combustion engine with crankcase scavenging|
    DD260409A3|1986-04-17|1988-09-28|Thaelmann Fahrzeug Jagdwaffen|EXHAUST CHANNEL FOR SLOTTED TWO-STROKE ENGINES|JPH04330329A|1991-04-30|1992-11-18|Sanshin Ind Co Ltd|Crank chamber pre-compression type 2-cycle internal combustion engine|
    AT402323B|1992-01-16|1997-04-25|Avl Verbrennungskraft Messtech|TWO-STROKE INTERNAL COMBUSTION ENGINE|
    SE504202C2|1995-04-07|1996-12-09|Electrolux Ab|Cylinder for a two-stroke internal combustion engine|
    US7694658B2|2005-07-06|2010-04-13|Team Orion Europe Sa|Two-stroke engine, especially for landcraft, watercraft, or aircraft models|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DD28964286A|DD260410A3|1986-04-28|1986-04-28|ARRANGEMENT AND DESIGN OF EXHAUST CHANNELS FOR TWO-STROKE INTERNAL COMBUSTION ENGINES|
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