WO2021244393A1 - 一种分层扫气活塞 - Google Patents

一种分层扫气活塞 Download PDF

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Publication number
WO2021244393A1
WO2021244393A1 PCT/CN2021/096399 CN2021096399W WO2021244393A1 WO 2021244393 A1 WO2021244393 A1 WO 2021244393A1 CN 2021096399 W CN2021096399 W CN 2021096399W WO 2021244393 A1 WO2021244393 A1 WO 2021244393A1
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WIPO (PCT)
Prior art keywords
piston
scavenging
groove
recesses
piston body
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PCT/CN2021/096399
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English (en)
French (fr)
Inventor
杨慧明
刘晓庆
陈军
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浙江派尼尔科技股份有限公司
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Publication of WO2021244393A1 publication Critical patent/WO2021244393A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to the technical field of internal combustion engines, in particular to a stratified scavenging piston.
  • the working cycle of a two-stroke internal combustion engine is completed within the time of two piston strokes, that is, one revolution of the crankshaft.
  • the exhaust process and the intake process are often collectively referred to as the ventilation process.
  • the air exchange process refers to the process in which exhaust gas is swept and replaced by fresh air from the cylinder.
  • the difference between the working cycles of these two internal combustion engines is mainly in the air exchange process.
  • the emissions of two-stroke gasoline engines need to meet the national second-stage emission requirements, the second-stage EU emissions requirements and the North American EPA requirements.
  • the technical problem to be solved by the present invention is to overcome the existing shortcomings and provide a layered scavenging piston.
  • the unburned fuel mixture can be directly discharged with the exhaust gas to improve the fuel oil.
  • Efficiency thereby reducing the proportion of fuel consumption, reducing exhaust emissions, can also save catalysts, reduce costs, easy to use, can effectively solve the problems in the background technology.
  • a layered scavenging piston comprising a piston, the upper end of the side of the piston is provided with an annular groove, and the upper end of the side of the piston is provided with two symmetrically arranged auxiliary scavenging
  • the lower end of the side surface of the piston and the auxiliary scavenging groove is provided with two symmetrically arranged scavenging grooves.
  • the scavenging groove is provided with a cylindrical groove horizontally intersecting the piston and two scavenging grooves.
  • the air groove is communicated through the cylindrical groove, and the middle part of the cylindrical groove is communicated with the bottom of the piston, and a piston pin is movably inserted through the inside of the cylindrical groove.
  • the upper end of the side of the piston is provided with a second groove, and the lower end of the side of the piston is provided with two symmetrically arranged first grooves.
  • the first groove is in communication with the scavenging groove.
  • the first groove and the scavenging groove are located at the same height.
  • the second groove and the auxiliary scavenging groove are located at the same height.
  • the stratified scavenging piston illustrated in the present invention has a simple structure.
  • the unburned fuel mixture can be reduced to be discharged directly with the exhaust gas, and the fuel efficiency is improved, thereby reducing the fuel consumption ratio and reducing exhaust gas emissions. , It can also save catalyst, reduce cost, and is convenient to use.
  • Figure 1 is a schematic diagram of the structure of the present invention
  • Figure 2 is a schematic cross-sectional view of the bottom view of the present invention.
  • 1 scavenging channel 1 scavenging channel, 2 auxiliary scavenging groove, 3 piston pin, 4 scavenging groove, 5 first groove, 6 second groove, 7 annular groove, 8 piston.
  • a layered scavenging piston including a piston 8, the upper end of the side of the piston 8 is provided with an annular groove 7, and the upper end of the side of the piston 8 is provided with two symmetrically arranged Auxiliary scavenging groove 2, the lower end of the side of the piston 8 and the auxiliary scavenging groove 2 is provided with two symmetrical scavenging grooves 4, and the inside of the scavenging groove 4 is provided with a cylindrical groove horizontally intersecting the piston 8 , And the two scavenging grooves 4 are connected through a cylindrical groove, and the middle of the cylindrical groove is connected with the bottom of the piston 8, and a piston pin 3 is movably inserted through the cylindrical groove to connect the external connecting rod and the piston 8.
  • the upper end of the side of the piston 8 is provided with a second groove 6, and the second groove 6 and the auxiliary scavenging groove 2 are located at the same height.
  • the lower end of the side of the piston 8 is provided with two symmetrically arranged first grooves 5, the first groove 5 is connected with the scavenging groove 4, and the first groove 5 and the scavenging groove 4 are located at the same height.
  • the entire stratified scavenging piston has a simple structure.
  • the addition of the first groove 5 and the second groove 6 can reduce the unburned fuel mixture being directly discharged with the exhaust gas, which improves fuel efficiency, thereby reducing the fuel consumption ratio and reducing exhaust gas emissions. It can also save catalysts, reduce costs, and is convenient to use.
  • the unburned fuel mixture can be directly discharged with the exhaust gas to improve fuel efficiency, thereby reducing the fuel consumption ratio, reducing exhaust gas emissions, saving catalysts, and reducing costs. Easy to use.

Abstract

一种分层扫气活塞，包括活塞(8)，活塞（8）的侧面上端设有环形槽（7），活塞（8）的侧面上端设有两个对称设置的辅助扫气凹槽（2），活塞（8）与辅助扫气凹槽（2）对应的侧面下端设有两个对称设置的扫气凹槽（4），扫气凹槽（4）的内部设有水平穿插活塞（8）的柱形槽，且两个扫气凹槽（4）通过柱形槽连通，且柱形槽的中部与活塞底部连通，且柱形槽的内部活动穿插有活塞销（3），活塞（8）的侧面上端设有第二凹槽（6），且活塞（8）的侧面下端设有两个对称设置的第一凹槽（5）。该分层扫气活塞，结构简单，通过增加第一凹槽（5）和第二凹槽（6）可以减少未燃烧的燃油混合气直接随排气排出，提高燃油效率，从而降低油耗比例，降低废气排放，还可以节省催化剂，降低成本，使用方便。

Description

一种分层扫气活塞 技术领域
本发明涉及内燃机技术领域，具体为一种分层扫气活塞。
背景技术
二冲程内燃机的工作循环式在两个活塞行程即曲轴旋转一周的时间内完成的。在四冲程内燃机中，常把排气过程和进气过程合称为换气过程。在二冲程内燃机中换气过程是指废气从气缸内被新气扫除并取代的过程。这两种内燃机的工作循环的不同之处主要在于换气过程。二冲程汽油发动机的排放需要满足国家二阶段排放要求和欧盟二阶段排放要求及北美地区EPA要求。
随着现有法规对排放要求日益提高，传统进气扫气方式发动机排放值较高，一般通过使用催化剂来降低排放值。但是这种方式发动机工作时，燃油消耗比例大，而且需要催化剂较多，从而增加了成本。
发明内容
本发明要解决的技术问题是克服现有的缺陷，提供一种分层扫气活塞，通过增加第一凹槽和第二凹槽可以减少未燃烧的燃油混合气直接随排气排出，提高燃油效率，从而降低油耗比例，降低废气排放，还可以节省催化剂，降低成本，使用方便，可以有效解决背景技术中的问题。
为实现上述目的，本发明提供如下技术方案：一种分层扫气活塞，包括活塞，所述活塞的侧面上端设有环形槽，所述活塞的侧面上端设有两个对称设置的辅助扫气凹槽，所述活塞与辅助扫气凹槽对应的侧面下端设有两个对称设置的扫气凹槽，所述扫气凹槽的内部设有水平穿插活塞的柱形槽，且两个扫气凹槽通过柱形槽连通，且柱形槽的中部与活塞底部连通，且柱形槽的内部活动穿插有活塞销。
所述活塞的侧面上端设有第二凹槽，且活塞的侧面下端设有两个对称设置的第一凹槽。
作为本发明的一种优选技术方案，所述第一凹槽与扫气凹槽连通。
作为本发明的一种优选技术方案，所述第一凹槽与扫气凹槽位于同一高度。
作为本发明的一种优选技术方案，所述第二凹槽与辅助扫气凹槽位于同一高度。
与现有技术相比，本发明的有益效果是：
本发明示例的分层扫气活塞，结构简单，通过增加第一凹槽和第二凹槽可以减少未燃烧的燃油混合气直接随排气排出，提高燃油效率，从而降低油耗比例，降低废气排放，还可以节省催化剂，降低成本，使用方便。
附图说明
图1为本发明结构示意图；
图2为本发明仰视图的剖视结构示意图。
图中：1扫气通道、2辅助扫气凹槽、3活塞销、4扫气凹槽、5第一凹槽、6第二凹槽、7环形槽、8活塞。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1-2，本发明提供一种技术方案：一种分层扫气活塞，包括活塞8，活塞8的侧面上端设有环形槽7，活塞8的侧面上端设有两个对称设置的辅助扫气凹槽2，活塞8与辅助扫气凹槽2对应的侧面下端设有两个对称设置的扫气凹槽4，扫气凹槽4的内部设有水平穿插活塞8的柱形槽，且两个扫气凹槽4通过柱形槽连通，且柱形槽的中部与活塞8底部连通，且柱形槽的内部活动穿插有活塞销3，用于连接外部连杆和活塞8。
活塞8的侧面上端设有第二凹槽6，第二凹槽6与辅助扫气凹槽2位于同一高度。
且活塞8的侧面下端设有两个对称设置的第一凹槽5，第一凹槽5与扫气凹槽4连通，第一凹槽5与扫气凹槽4位于同一高度。
通过第二凹槽6、第一凹槽5、一对扫气凹槽4和一对辅助扫气凹槽2的配合使新鲜空气参与到发动机扫气，从而实现空气扫气与燃油混合气的分层扫气。
整个分层扫气活塞，结构简单，通过增加第一凹槽5和第二凹槽6可以减少未燃烧的燃油混合气直接随排气排出，提高燃油效率，从而降低油耗比例，降低废气排放，还可以节省催化剂，降低成本，使用方便。
本发明通过增加第一凹槽5和第二凹槽6可以减少未燃烧的燃油混合气直接随排气排出，提高燃油效率，从而降低油耗比例，降低废气排放，还可以节省催化剂，降低成本，使用方便。
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同物限定。

Claims (4)

  1. 一种分层扫气活塞，包括活塞(8)，所述活塞(8)的侧面上端设有环形槽(7)，其特征在于：所述活塞(8)的侧面上端设有两个对称设置的辅助扫气凹槽(2)，所述活塞(8)与辅助扫气凹槽(2)对应的侧面下端设有两个对称设置的扫气凹槽(4)，所述扫气凹槽(4)的内部设有水平穿插活塞(8)的柱形槽，且两个扫气凹槽(4)通过柱形槽连通，且柱形槽的中部与活塞(8)底部连通，且柱形槽的内部活动穿插有活塞销(3)；
    所述活塞(8)的侧面上端设有第二凹槽(6)，且活塞(8)的侧面下端设有两个对称设置的第一凹槽(5)。
  2. 根据权利要求1所述的分层扫气活塞，其特征在于：所述第一凹槽(5)与扫气凹槽(4)连通。
  3. 根据权利要求1所述的分层扫气活塞，其特征在于：所述第一凹槽(5)与扫气凹槽(4)位于同一高度。
  4. 根据权利要求1所述的分层扫气活塞，其特征在于：所述第二凹槽(6)与辅助扫气凹槽(2)位于同一高度。
PCT/CN2021/096399 2020-06-02 2021-05-27 一种分层扫气活塞 WO2021244393A1 (zh)

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CN111810313A (zh) * 2020-06-02 2020-10-23 浙江派尼尔科技股份有限公司 一种分层扫气活塞

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EP2348208A2 (en) * 2010-01-22 2011-07-27 Yamabiko Corporation Two-stroke internal combustion engine and its scavenging method
CN102162395A (zh) * 2010-02-17 2011-08-24 安德烈亚斯·斯蒂尔两合公司 两冲程发动机
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CN1661213A (zh) * 2004-02-23 2005-08-31 伊莱克斯家用产品有限公司 采用气流进行分层空气清扫的两冲程发动机
US20100147252A1 (en) * 2007-07-06 2010-06-17 Mahle Konig Kommanditgesellschaft Gmbh & Co. Piston, Cylinder and Piston Assembly and Piston Ring for a Piston
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