WO2014201952A1 - 四冲程发动机 - Google Patents

四冲程发动机 Download PDF

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Publication number
WO2014201952A1
WO2014201952A1 PCT/CN2014/079236 CN2014079236W WO2014201952A1 WO 2014201952 A1 WO2014201952 A1 WO 2014201952A1 CN 2014079236 W CN2014079236 W CN 2014079236W WO 2014201952 A1 WO2014201952 A1 WO 2014201952A1
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WO
WIPO (PCT)
Prior art keywords
chamber
oil
crankshaft
stroke engine
cam
Prior art date
Application number
PCT/CN2014/079236
Other languages
English (en)
French (fr)
Inventor
孔钊
郭宁
冯可亚
Original Assignee
苏州科瓴精密机械科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 苏州科瓴精密机械科技有限公司 filed Critical 苏州科瓴精密机械科技有限公司
Priority to US14/899,068 priority Critical patent/US9797281B2/en
Priority to EP14813125.3A priority patent/EP3012423A4/en
Publication of WO2014201952A1 publication Critical patent/WO2014201952A1/zh

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/105—Lubrication of valve gear or auxiliaries using distribution conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/06—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like the cams, or the like, rotating at a higher speed than that corresponding to the valve cycle, e.g. operating fourstroke engine valves directly from crankshaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/12—Closed-circuit lubricating systems not provided for in groups F01M1/02 - F01M1/10
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/106—Oil reservoirs
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • 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
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four

Definitions

  • the invention relates to a four-stroke engine.
  • An object of the present invention is to provide an improved four-stroke engine which is not only easy to set up in a lubrication system but also has good running stability, low noise, and simple structure in view of the above-mentioned drawbacks in the prior art.
  • a four-stroke engine includes a fuel tank, a crank chamber, a distribution chamber, a rocker chamber, a combustion chamber, and a lubrication system
  • the lubrication system is: a fuel tank and a crank chamber
  • the oil passage is connected;
  • the crank chamber communicates with the distribution chamber through the first oil passage, and a check valve is disposed in the first oil passage;
  • the rock chamber and the crank chamber communicate with each other through at least one oil return passage, and are back a check valve is disposed in the oil passage;
  • a distribution chamber communicating with the oil tank and configured to separate the oil and gas mixture into an oil mist and a liquid oil
  • the stroke engine further includes a cam and a cam and a crank chamber
  • a transmission mechanism between the crankshafts that mates with the rocker arm of the rocker chamber and is located above the combustion chamber.
  • the present invention also proposes the following technical solutions:
  • the transmission mechanism includes a large pulley, a small pulley, and a belt that is sleeved on the large pulley and the small pulley.
  • the large pulley is integrally formed with the cam and rotatable about a rotational axis.
  • the small pulley is mated with a crankshaft of the crank chamber.
  • the transmission mechanism is disposed in a transmission chamber, and the transmission chamber is in communication with the rocker arm chamber.
  • the lubrication system also includes a second oil transfer passage disposed between the distribution chamber and the transmission chamber.
  • the cam and the rocker arm are in direct contact with each other.
  • a check valve is disposed in the oil supply passage.
  • the invention has the advantages that: the four-stroke engine provided by the invention has a lubricating system which is arranged by comparing a plurality of specific oil passages and a single valve located in the oil passage to make the arrangement of the lubrication system The simplification and lubrication effect is better.
  • the cam inside the rocker arm by arranging the cam inside the rocker arm, the overall structure is simplified while achieving good running stability, low noise and low vibration. Description
  • FIG. 1 is a cross-sectional view of a four-stroke engine corresponding to a preferred embodiment of the present invention.
  • Figure 2 is a cross-sectional view taken along line E-E of Figure 1.
  • Figure 3 is a partial elevation view of the engine of Figure 1.
  • Figure 4 is a schematic illustration of the overall layout of the engine of Figure 1 and its lubrication system.
  • a four-stroke engine of the present invention includes a crank chamber 1, a fuel tank 2, a rocker chamber 4, a distribution chamber 5, an air filter 6, a combustion chamber 9 located above the rocker chamber 4, and each of the above A lubrication system (not numbered) between the components, wherein the crank chamber 1, the mailbox 2, the distribution chamber 5, and the air filter 6 are substantially similar to the two reference patent applications 201210198826. 4 and 2013102076373 of the present patent application, The detailed description is omitted, and only the innovations are explained in detail below.
  • the above four-stroke engine further includes a cam 7 and a transmission mechanism 8 disposed between the cam 7 and the crank chamber 1.
  • the transmission mechanism 8 includes a small pulley 82, a large pulley 84, and a belt 86 that is sleeved on the large pulley 84 and the small pulley 82.
  • the cam 7 is integrally formed with the large pulley 84 and simultaneously sleeved on the same rotating shaft 88, and the cam 7 is located above the combustion chamber 9, that is, the cam 7 is placed overhead.
  • the cam 7 can also be manufactured separately from the large pulley 84.
  • the transmission mechanism 8 is located inside the transmission chamber 80 and communicates with the rocker chamber 4.
  • the rocker arm rotating shaft 42 and the rocker arm 44 mounted on the rocker arm rotating shaft 42 are disposed inside the rocker arm chamber 4. Since the cam 7 of the present invention is placed upside down, it is in direct contact with the rocker arm 44 to transmit Force, canceled the tappet in the prior art. Thus, the power distribution of the present invention is transmitted from the crankshaft 12 to the cam 7 through the transmission mechanism 8, and then the cam 7 is directly transmitted to the rocker arm 44 to control the opening and closing of the valve.
  • the present invention eliminates the prior art cam chamber by arranging the cam 7 above the combustion chamber 9, simplifies its overall structure, and is removed by direct mating between the cam 7 and the rocker arm 44.
  • the negative effects brought about by the tappet in the prior art are that good running stability, low noise and low vibration are obtained.
  • the above-described lubrication system is generally arranged in the same manner as the two reference patent applications of the present patent application, including: an oil supply passage 21 disposed between the oil tank 2 and the crank chamber 1 and a check valve 211 disposed in the oil supply passage 21. a first oil passage 15 disposed between the crank chamber 1 and the distribution chamber 5, a check valve 151 disposed in the first oil passage 15, and a second disposed between the distribution chamber 5 and the transmission chamber 80 An oil passage 53 and at least one oil return passage 41 disposed between the rocker chamber 4 and the crank chamber 1 and a check valve 413 disposed in the at least one oil return passage 41. Corresponding to the preferred embodiment of the invention, the number of oil return passages 41 is substantially parallel to each other.
  • the lubrication system provided by the present invention makes the structure of the lubrication system relatively simple by setting a plurality of oil passages 21, 15, 53, and 41 and a one-way valve located in the oil passage. Better lubrication, good lubrication at any location, reduced pollutant emissions and manufacturing costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

一种四冲程发动机，包括油箱（2）、曲轴室（1）、分配室（5）、摇臂室（4）、燃烧室（9）以及润滑***。油箱（2）与曲轴室（1）通过供油通道（21）连通；曲轴室（1）与分配室（5）通过第一输油通道（15）相连通，并在第一输油通道（15）中设置单向阀（151）；摇臂室（4）与曲轴室（1）通过至少一个回油通道（41）连通，并在回油通道（41）中设置单向阀（413）；以及分配室（5）与油箱（2）相连通并用于将油气混合物分离成油雾和液态油。所述四冲程发动机还包括凸轮（7）和配接在凸轮（7）与曲轴室（1）的曲轴之间的传动机构（8），所述凸轮（7）与摇臂室（4）的摇臂（44）相配接且位于燃烧室（9）的上方。上述四冲程发动机的润滑***简单、运行稳定性好且噪音低。

Description

四抻程发动机 本专利申请可参考本专利申请人之前所提交的两个发明专利申请，其申请号 分别为： 201210198826. 4以及 2013102076373。
技术领域
本发明涉及一种四冲程发动机。
^ 四 程发动机如今也已经被广泛的应用在各种小型工具上， 比如手提式割 草机、 剪切机或其他背负式作业机等。 所以， 发动机除了在运行稳定性、 低振 动以及润滑***的要求比较严格之外， 在其整体结构上的零部件简化、 质量轻 便的需求也变得日益强烈。
现有的四冲程发动机， 大致存在两个方面的问题： 一方面是润滑***的油 路管道比较复杂， 使得加工复杂， 成本提高； 另一方面是零部件的结构比较复 杂， 质量不够轻便， 比如， 现有四冲程发动机的凸轮室与摇臂室是单独分开设 置的而且距离比较远， 这样凸轮室的凸轮需要通过一根比较长的金属挺杆传递 动力给摇臂室的摇臂， 故而高速运转的挺杆会产生比较大的^动性而负面影响 发动机的运行稳定性和噪音性能， 而且， 单独设置的凸轮室和摇臂室也会使得 发动机的零部件较多， 增加了其自身的重量， 制造成本较高。
、 本发明的目的在于针对现有技术中的上述缺陷， 提供一种改进的四冲程发 动机， 其不仅润滑***设置简单， 而 i运行稳定性良好、 噪音低以及结构简单。
为实现上述发明目的， 本发明采用了如下主要技术方案： 一种四冲程发动 机， 包括油箱、 曲轴室、 分配室、 摇臂室、 燃烧室以及润滑***， 所述润滑系 统为： 油箱与曲轴室通过供油通道连通； 曲轴室与分配室通过第一输油通道相 连通， 并在第一输油通道中设置单向阀； 摇臂室与曲轴室通过至少一个回油通 道连通， 并在回油通道中设置单向阀； 以及分配室， 其与油箱相连通并用于将 油气混合物分离成油雾和液态油， 其特征在于； 所述 冲程发动机还包括凸轮 和配接在凸轮与曲轴室的曲轴之间的传动机构， 所述凸轮与摇臂室的摇臂相配 接且位于燃烧室的上方。 此外， 本发明还提出如下^属技术方案：
所述传动机构包括大带轮、 小带轮以及套设在大带轮和小带轮上的皮带。 所述大带轮与凸轮一体成型并可绕着一旋转轴旋转。
所述小带轮与曲轴室的曲轴相配接。
所述传动机构设置在一传动室内， 所述传动室与摇臂室相连通。
所述润滑***还包括设置在分配室与传动室之间的第二输油通道。
所述凸轮与摇臂直接相互接触。
所述供油通道中设置单向阀。
相比于现有技术， 本发明的优点在于： 本发明所提供的四冲程发动机， 其 润滑***通过设置数个具体的油路通道和位于油路通道中的单 阀， 使得润滑 ***的布置比较简洁且润滑效果更佳， 另一方面， 通过将凸轮设置在摇臂室内 部， 简化了其整体结构的同时获得了良好的运行稳定性、 低噪音性和低振动性。 酎图说明
图 1是对应于本发明较佳实施例的四冲程发动机的剖视图。
图 2是沿着图 1中 E- E线的剖视图。
图 3是图 1中发动机的局部立偉图。
图 4是图 1中发动机的整偉布局及其润滑***的示意图。
、 以下结 较佳实施例及其附图对本发明技术方案作进一步非限制性的详细
1 参照图 1至图 4 , 本发明的四冲程发动机包括曲轴室 1、 油箱 2、 摇臂室 4、 分配室 5、 空滤器 6、 位于摇臂室 4上方的燃烧室 9以及设置于上述各部件之间 的润滑*** （未标号）， 其中的曲轴室 1、 邮箱 2、 分配室 5以及空滤器 6的构 造与本发明专利申请的两个参考专利申请 201210198826. 4 以及 2013102076373 大致类似， 在此省略其详细描述， 以下仅对其创新之处做详细解释说明。
上述四冲程发动机还包括凸轮 7和设置在凸轮 7与曲轴室 1之间的传动机 构 8。 所述传动机构 8包括小带轮 82、 大带轮 84以及套设在大带轮 84和小带 轮 82上的皮带 86。凸轮 7与大带轮 84—体成型并同时套设在同一旋转轴 88上， 并且凸轮 7位于燃烧室 9的上方， 即相当于将凸轮 7进行顶置。 当然， 凸轮 7 也可以与大带轮 84分开制造。上述传动机构 8位于传动室 80内部并与摇臂室 4 相互连通。 摇臂室 4的内部设置摇臂旋转轴 42和安装在摇臂旋转轴 42上的摇 臂 44。 因本发明的凸轮 7进行了顶置， 故而其与摇臂 44直接相互接触以传递动 力， 取消了现有技术中的挺杆。 这样， 本发明的配气动力是由曲轴 12通过传动 机构 8传递给凸轮 7,然后凸轮 7直接传递给摇臂 44以控制气门的打开和关闭。 因而， 本发明通过将凸轮 7设置在燃烧室 9的上方， 而去除了现有技术中的凸 轮室， 简化了其整体结构， 而且通过凸轮 7与摇臂 44之间的直接配接， 去除了 现有技术中挺杆所带来的负面作用， 即获得了良好的运行稳定性、 低噪音性和 低振动性。
上述润滑***的设置大体与本发明专利申请的两个参考专利申请相同， 即 包括： 设置在油箱 2与曲轴室 1之间的供油通道 21和设置在供油通道 21 内的 单向阀 211、 设置在曲轴室 1与分配室 5之间的第一输油通道 15和设置在该第 一输油通道 15内的单向阀 151、设置在分配室 5与传动室 80之间的第二输油通 道 53、以及设置在摇臂室 4与曲轴室 1之间的至少一个回油通道 41和设置在该 至少一个回油通道 41内的单向阀 413。 对应于本发明较佳实施例， 回油通道 41 的数量为两个 ϋ大致相互平行。 可见， 本发明所提供的润滑***， 其通过设置 布局更合理的数个油路通道 21、 15、 53 以及 41和数个位于油路通道内的单向 阀， 使得润滑***的结构比较简洁 i润滑效果更佳， 在任何位置都能保持良好 润滑效果的， 降低了污染物的排放和制造成本。
需要指出的是， 上述较佳实施例仅为说明本发明的技术构思及特点， 其目的 在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制 本发明的保护范围。凡裉据本发明精神实质所作的等效变化或修饰， 都应涵盖在 本发明的保护范围之内。

Claims

1、 一种四冲程发动机， 包括油箱、 曲轴室、 分配室、 摇臂室、 燃烧室以及 润滑***， 所述润滑***为： 油箱与曲轴室通过供油通道连通； 曲轴室与分配 室通过第一输油通道相连通， 并在第一输油通道中设置单向阛； 摇臂室与曲轴 室通过至少一个回油通道连通， 并在回油通道中设置单向阀； 以及分配室， 其 与油箱相连通并用于将油气混合物分离成油雾和液态油， 其特征在于： 所述四 冲程发动机还包括凸轮和配接在凸轮与曲轴室的曲轴之间的传动机构， 所述凸 轮与摇臂室的摇臂相配接 ϋ位于燃烧室的上方。
2、 根据权利要求 1所述的四冲程发动机， 其特征在于： 所述传动机构包括 大带轮、 小带轮以及套设在大带轮和小带轮上的皮带。
3、 根据权利要求 2所述的四冲程发动机， 其特征在于： 所述大带轮与凸轮 一体成型并可绕着一旋转轴旋转。
4、 根据权利要求 2所述的四冲程发动机， 其特征在于： 所述小带轮与曲轴 室的曲轴相配接。
5、 根据权利要求 2所述的四冲程发动机， 其特征在于： 所述传动机构位于 传动室内， 所述传动室与摇臂室相连通。
6、 根据权利要求 5所述的四冲程发动机， 其特征在于： 所述润滑***还包 括设置在分配室与传动室之间的第二输油通道。
7、 根据权利要求 1所述的四冲程发动机， 其特征在于： 所述凸轮与摇臂直 接相互接蝕。
8、 根据权利要求 1所述的四冲程发动机， 其特征在于： 所述供油通道中设 置单向阀。
PCT/CN2014/079236 2013-06-17 2014-06-05 四冲程发动机 WO2014201952A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/899,068 US9797281B2 (en) 2013-06-17 2014-06-05 Four-stroke engine
EP14813125.3A EP3012423A4 (en) 2013-06-17 2014-06-05 Four-stroke engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310239152.2 2013-06-17
CN201310239152.2A CN103277166B (zh) 2013-06-17 2013-06-17 四冲程发动机

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WO2014201952A1 true WO2014201952A1 (zh) 2014-12-24

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EP3012423A1 (en) 2016-04-27
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US20160130994A1 (en) 2016-05-12
US9797281B2 (en) 2017-10-24
CN103277166A (zh) 2013-09-04

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