WO2024027445A1 - 一种曲轴箱的通风结构 - Google Patents

一种曲轴箱的通风结构 Download PDF

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Publication number
WO2024027445A1
WO2024027445A1 PCT/CN2023/105633 CN2023105633W WO2024027445A1 WO 2024027445 A1 WO2024027445 A1 WO 2024027445A1 CN 2023105633 W CN2023105633 W CN 2023105633W WO 2024027445 A1 WO2024027445 A1 WO 2024027445A1
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WIPO (PCT)
Prior art keywords
way valve
crankcase
valve plate
chamber
ventilation
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PCT/CN2023/105633
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English (en)
French (fr)
Inventor
莫康鑫
潘江伟
陈琦
王清
张立成
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浙江钱江摩托股份有限公司
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Publication of WO2024027445A1 publication Critical patent/WO2024027445A1/zh

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    • 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
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/0011—Breather valves
    • 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
    • F01M13/00—Crankcase ventilating or breathing

Definitions

  • the invention belongs to the technical field of engines and relates to a ventilation structure of a crankcase.
  • blowby gas When the engine is running, the high-pressure combustible mixture and burned gas in the combustion chamber will more or less leak into the crankcase through the gap between the piston group and the cylinder, causing blow-by.
  • the components of blowby gas are unburned fuel gas, water vapor and exhaust gas, etc., which will dilute the engine oil, reduce the performance of the engine oil, and accelerate the oxidation and deterioration of the engine oil.
  • Water vapor condenses in the engine oil, forming sludge and blocking the oil circuit; the acidic gases in the exhaust gas mix into the lubrication system, causing corrosion and accelerated wear of engine parts; blow-by gas can also cause the crankcase pressure to be too high and damage the crankcase seal. , causing oil leakage and loss.
  • crankcase ventilation In order to prevent excessive crankcase pressure, extend the service life of engine oil, reduce wear and corrosion of parts, and prevent engine oil leakage, crankcase ventilation must be implemented.
  • the patent document with application publication number CN102042055A discloses an engine equipped with a ventilation mechanism.
  • the ventilation mechanism includes: a ventilation passage leading to the crankcase; a ventilation chamber communicating with the crankcase via the ventilation passage; and a ventilation valve disposed in the ventilation chamber and once When the internal pressure of the crankcase exceeds a predetermined value, the breather valve can be opened to allow blowby gas to flow from the crankcase into the breather chamber.
  • the above ventilation mechanism can achieve the ventilation effect of the crankcase, but when the engine is operating normally, the oil containing impurities driven by the air flow will flow back to the oil pan of the crankcase through the one-way valve, affecting the quality of the circulating oil.
  • the present invention provides a crankcase Ventilation structure, the technical problem to be solved by the present invention is to achieve stable air pressure while ensuring the quality of engine oil.
  • a ventilation structure of a crankcase The crankcase includes a crankshaft chamber and a ventilation chamber.
  • the ventilation structure includes a one-way valve that can only allow gas in the crankshaft chamber to flow into the ventilation chamber. It is characterized in that the inner side wall of the ventilation chamber has a backflow groove, the inner cavity of the return groove is connected to the crankshaft chamber, the one-way valve plate is arranged in the up and down direction to seal the open mouth of the return groove, and the upper end of the one-way valve plate is the free end, The lower end of the one-way valve piece is fixed to the open end of the return groove.
  • the crankshaft chamber is a chamber that accommodates the crankshaft body and connecting rod components.
  • the breather chamber is arranged adjacent to the crankshaft chamber to guide and utilize the gas discharged by increasing the pressure in the crankshaft chamber.
  • the crankshaft chamber and the breather chamber are connected to achieve pressure relief and smooth flow of gas.
  • the one-way valve disc ensures the sealing of the internal environment of the crankshaft chamber; the one-way valve disc can be a metal shrapnel or a rubber valve disc, etc.
  • the free end of the one-way valve plate is located at the upper end, and the lower end of the one-way valve plate is fixedly connected to the backflow groove.
  • the open end of the groove so that the pressurized gas in the crankcase will push the upper end of the one-way valve plate open, and the oil mist condensed on the one-way valve plate from bottom to top will slide to the lower end of the return groove and be affected by the single It is gathered to the constraints of the valve plate and slowly flows back.
  • the metal shavings and other impurities generated during the engine running-in will also stick to the one-way valve plate when the pressurized gas is discharged, and then the random oil will be deposited at the lower end of the return groove to avoid
  • the flow into the lubricating oil circuit causes mechanical damage, and the quality of the oil circulation is ensured under the condition of stable crankshaft chamber pressure.
  • a sedimentation groove extending to the one-way valve plate is provided on the bottom surface of the inner cavity of the return groove.
  • the bottom of the inner cavity of the return groove is the lower end of the return groove.
  • the inner wall of the return groove has a There is a through opening communicating with the crankshaft chamber, and the through opening is arranged opposite to the sedimentation groove located below the through opening.
  • the oil mist gas flowing from the crankshaft chamber into the return groove will first contact downward with the cooled engine oil in the sedimentation groove, and is pre-cooled, and then enter the return groove to flow upward and contact the one-way valve plate and the inner wall of the return groove over a long stroke. Further condense the reflux to improve the reflux and deposition effects.
  • a pressure baffle is connected to the opening of the return groove, and the one-way valve plate is clamped between the pressure baffle and the open end surface of the return groove.
  • the pressure baffle is strip-shaped and the upper end of the pressure baffle is bent toward the side away from the one-way valve plate. In this way, the pressure baffle can effectively restrict the deformation range of the one-way valve plate, avoid warping deformation in other positions of the one-way valve plate, and ensure stable pressure relief and stable impurity deposition.
  • the bottom surface of the sedimentation tank is inclined toward the side where the one-way valve plate is located. In this way, the impurities deposited in the sedimentation groove will gather on the side close to the one-way valve plate, which can prevent the impurities from flowing out of the return groove with the oil when the oil overflows the return groove, ensuring the deposition effect.
  • the pressure baffle is fixedly connected to the open end surface of the return groove through bolts arranged around the circumference of the pressure baffle.
  • the fixed points of the one-way valve plate are arranged around the circumference, which is beneficial to improving the sealing effect of the one-way valve plate.
  • the return groove can be easily cleaned after disassembling the one-way valve plate during maintenance.
  • the pressure baffle has a plurality of relief through holes. This will help reduce the probability of leakage of the one-way valve disc due to insufficient flatness of the pressure baffle and ensure the sealing effect of the one-way valve disc.
  • the inner wall of the ventilation chamber has a protruding convex ring, the inner cavity of the convex ring forms the return groove, and the one-way valve piece is fixed on the convex ring. This improves the heat exchange efficiency between the oil mist in the return groove and the cooler gas in the ventilation chamber, thereby promoting the condensation speed.
  • the crankcase is provided with a combustion cylinder block and a balance cylinder block, and the return groove is located below the balance cylinder block.
  • the grooves are arranged under the balanced cylinder that does not participate in combustion and heating, which is beneficial to reducing the ambient temperature in the channel and improving the condensation effect.
  • the pressurized gas in the crankcase will push the upper end of the one-way valve plate open for ventilation, and the oil mist condensed on the one-way valve plate will slide to the lower end of the return groove as the liquid level rises. High and slow return flow.
  • metal chips and other impurities generated during engine running-in will also adhere and collect at the one-way valve when the pressurized gas is discharged, and then random oil will be deposited at the lower end of the return groove to avoid flowing into the lubricating oil circuit and causing mechanical damage.
  • the groove can be easily cleaned after disassembling the one-way valve plate during maintenance, so as to ensure the oil circulation quality under the condition of stable crankshaft chamber pressure.
  • Figure 1 is a schematic three-dimensional structural diagram of the engine in this embodiment.
  • Figure 2 is a schematic cross-sectional structural diagram along the P-P direction in Figure 1.
  • FIG. 3 is an enlarged view of part A in FIG. 2 .
  • Figure 4 is a schematic diagram of a three-dimensional explosion structure in which part of the structure is hidden in this embodiment.
  • FIG. 5 is an enlarged view of part B in FIG. 4 .
  • crankshaft chamber 2. breather chamber;
  • the crankcase 10 in the ventilation structure of the crankcase, includes a crank chamber 1 and a ventilation chamber 2, and the crank chamber 1 and the ventilation chamber 2 are connected.
  • the crankshaft chamber 1 is a chamber that accommodates the crankshaft body and connecting rod components.
  • the breather chamber 2 is arranged adjacent to the crankshaft chamber 1 and is used to guide and utilize the gas discharged from the crankshaft chamber 1 by increasing the air pressure, and connects the crankshaft chamber 1 and the breather chamber 2 , to achieve smooth flow of gas pressure relief.
  • the ventilation structure includes a one-way valve plate 4 that can only allow gas in the crank chamber 1 to flow into the ventilation chamber 2 .
  • the one-way valve piece 4 is a strip-shaped metal spring piece or a rubber valve piece.
  • the return groove 3 has an opening 33.
  • the inner wall of the ventilation chamber 2 has an open end face 34 at the opening 33.
  • the inner cavity of the return groove 3 is connected with the crankshaft chamber 1. .
  • the one-way valve plate 4 is arranged in the up and down direction and can seal the opening 33 of the return groove 3.
  • the upper end of the one-way valve plate 4 is the free end 41, and the lower end of the one-way valve plate 4 is fixedly connected to the opening 33 of the return groove 3.
  • a sedimentation groove 31 extending to the one-way valve plate 4 is provided on the bottom surface of the inner cavity of the return groove 3.
  • the one-way valve plate 4 is detachably fixed on the open end surface 34 of the return groove 3 .
  • the one-way valve plate 4 ensures the sealing of the internal environment of the crankcase 1; by setting the upper end of the one-way valve plate 4 as the free end 41, and opening a sedimentation groove 31 at the lower end of the return groove 3, the belt in the crankcase 10 is
  • the pressurized gas enters the return groove 3 from the crankshaft chamber 1, contacts and acts on the one-way valve plate 4.
  • the pressurized gas will push open and discharge the upper end of the one-way valve plate 4 to achieve ventilation.
  • it will The oil in the form of oil mist coming from the compressed air will condense when it contacts the one-way valve plate 4.
  • the oil mist condensed on the one-way valve plate 4 will fall into the sedimentation tank 31 under the action of its own gravity.
  • the open end surface 34 of the return groove 3 is connected to the pressure baffle 5, and the one-way valve plate 4 is clamped between the pressure baffle 5 and the open end surface of the return groove 3.
  • the pressure baffle 5 is strip-shaped and the upper end of the pressure baffle 5 faces The side away from the one-way valve plate 4 is bent.
  • pressurized gas acts on the upper end of the one-way valve plate 4, the upper end of the one-way valve plate 4 deforms toward the upper end of the pressure baffle 5, opening the upper side of the opening 33 to relieve pressure.
  • the pressure baffle 5 can effectively restrict the deformation range of the one-way valve plate 4, avoid warping deformation at other positions of the one-way valve plate 4, and ensure stable pressure relief and stable impurity deposition.
  • the pressure baffle 5 is fixedly connected to the crankcase 10 through three bolts 6 arranged along the circumferential direction of the pressure baffle 5 .
  • the fixed points of the one-way valve plate 4 are arranged around the circumference, which is beneficial to improving the sealing effect of the one-way valve plate 4.
  • the pressure baffle 5 has three relief through holes 51 . This will help reduce the probability of leakage of the one-way valve plate 4 due to insufficient flatness of the pressure baffle 5 and ensure the sealing effect of the one-way valve plate 4.
  • the bottom surface of the sedimentation tank 31 is inclined from top to bottom toward the side where the one-way valve plate 4 is located.
  • the impurities deposited in the sedimentation tank 31 will gather on the side close to the one-way valve plate 4, which can prevent the impurities from flowing out of the sedimentation tank 31 with the oil when the engine oil overflows the sedimentation tank 31, thus ensuring the deposition effect.
  • the inner wall of the return groove 3 has a through hole 32 that communicates with the crankshaft chamber 1 from bottom to top.
  • the inner cavity of the return groove 3 is connected with the crankshaft chamber 1 through the through hole 32 .
  • the through hole 32 communicates with the sediment located below the through hole 32
  • the grooves 31 are arranged opposite each other.
  • the crankcase 10 is provided with a combustion cylinder block 8 and a balance cylinder block 9.
  • the combustion cylinder block 8 and the balance cylinder block 9 can be existing assemblies, and the return groove 3 is located below the balance cylinder block 9. In this way, the return groove 3 is arranged under the balance cylinder 9 which does not participate in the combustion temperature rise, which is beneficial to reducing the ambient temperature in the return groove 3 and improving the condensation effect.
  • the inner wall of the ventilation chamber 2 has a protruding convex ring 7.
  • the inner cavity of the convex ring 7 forms a return groove 3.
  • An opening 33 is provided at one end of the convex ring 7 facing away from the crankshaft chamber 1.
  • the end surface of the convex ring 7 with the opening 33 is the open end surface 34 . This improves the heat exchange efficiency between the oil mist in the return groove 3 and the cooler air in the ventilation chamber 2, thereby promoting the condensation speed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

本发明提供了一种曲轴箱的通风结构，属于发动机技术领域。它解决了现有曲轴箱的通风结构在发动机正常工作时，受气流带动而含有杂质的机油会通过单向阀流回油底壳，影响循环机油质量的技术问题。本曲轴箱的通风结构中，曲轴箱包括曲轴室(1)和通气室(2)，通风结构包括仅能使曲轴室(1)内的气体流入通气室(2)的单向阀片(4)，通气室(2)的内侧壁上具有回流凹槽(3)，回流凹槽(3)的内腔与曲轴室(1)连通，单向阀片(4)上下方向设置能将回流凹槽(3)的敞口封闭，该单向阀片(4)的上端为自由端，单向阀片(4)的下端固连于回流凹槽(3)的敞口端面上。本通风结构用于在实现曲轴室压力稳定的条件下保证机油循环质量。

Description

一种曲轴箱的通风结构 技术领域
本发明属于发动机技术领域，涉及一种曲轴箱的通风结构。
背景技术
在发动机工作时，燃烧室的高压可燃混合气和已燃气体，或多或少会通过活塞组与气缸之间的间隙漏入曲轴箱内，造成窜气。窜气的成分为未燃的燃油气、水蒸气和废气等，这会稀释机油，降低机油的使用性能，加速机油的氧化、变质。水汽凝结在机油中，会形成油泥，阻塞油路；废气中的酸性气体混入润滑系统，会导致发动机零件的腐蚀和加速磨损；窜气还会使曲轴箱的压力过高而破坏曲轴箱的密封，使机油渗漏流失。为防止曲轴箱压力过高，延长机油使用期限，减少零件磨损和腐蚀，防止发动机漏油，必须实行曲轴箱通风。
申请公布号为CN102042055A的专利文献公开了一种配备有通气机构的发动机。所述通气机构包括：通向曲轴箱的通气通道；通气室，所述通气室经由所述通气通道与所述曲轴箱连通；以及通气阀，所述通气阀设置在所述通气室内，并且一旦所述曲轴箱的内压超过预定值，所述通气阀就可打开，以使得窜气能够从所述曲轴箱流入所述通气室。
上述通气机构可实现曲轴箱的通风效果，但在发动机正常工作时，受气流带动而含有杂质的机油会通过单向阀流回曲轴箱的油底壳，影响循环机油的质量。
发明内容
本发明针对现有的技术存在的上述问题，提供一种曲轴箱的 通风结构，本发明所要解决的技术问题是：实现气压稳定同时保证机油质量。
本发明的目的可通过下列技术方案来实现：
一种曲轴箱的通风结构，曲轴箱包括曲轴室和通气室，通风结构包括仅能使曲轴室内的气体流入通气室的单向阀片，其特征在于，所述通气室的内侧壁上具有回流凹槽，所述回流凹槽的内腔与所述曲轴室连通，所述单向阀片上下方向设置能将所述回流凹槽的敞口封闭，该单向阀片的上端为自由端，所述单向阀片的下端固连于回流凹槽的敞口端面上。
曲轴室为容纳曲轴本体及连杆部件的腔室，通气室与曲轴室相邻布置，用于将曲轴室内气压增加排出的气体导流利用，曲轴室和通气室连通，实现气体泄压顺畅流动，单向阀片保证曲轴室内部环境的封闭性；单向阀片可为金属弹片或橡胶阀片等。通过在通气室的内侧壁设置回流凹槽，上下方向设置的单向阀片将回流凹槽的敞口封闭，单向阀片的自由端位于上端，单向阀片的下端固连于回流凹槽的敞口端面，这样曲轴箱内的带压气体会将单向阀片的上端顶开，而自下而上冷凝在单向阀片上的油雾则会滑落至回流凹槽的下端，受到单向阀片的约束而汇集并缓慢回流，同时发动机磨合时产生的金属屑和其他杂质也会随带压气体排出时黏附汇集至单向阀片处，进而随机油沉积至回流凹槽下端处，避免流入润滑油路造成机械损伤，实现曲轴室压力稳定的条件下保证机油循环质量。
在上述曲轴箱的通风结构中，所述回流凹槽的内腔底面开设有延伸至单向阀片处的沉积槽。回流凹槽的内腔底部即回流凹槽的下端处。这样设置沉积槽能够增加积垢深度，进一步保证金属屑和其他杂质能沉积在沉积槽内，使积垢集中且不会随机油回流，保证维护便捷性和机油循环质量。
在上述曲轴箱的通风结构中，所述回流凹槽的内壁具有自下 而上与所述曲轴室连通的通口，所述通口与位于通口下方的所述沉积槽相对布置。这样自曲轴室流入回流凹槽的油雾气体会先向下与沉积槽处冷却的机油液接触，预先降温，再进入回流凹槽向上流动并与单向阀片及回流凹槽内壁长行程接触，进一步冷凝回流，提升回流和沉积效果。
在上述曲轴箱的通风结构中，所述回流凹槽的敞口处连接有压力挡板，所述单向阀片夹持于所述压力挡板和所述回流凹槽的敞口端面之间，该压力挡板呈条形且压力挡板的上端朝远离单向阀片的一侧弯曲。这样压力挡板可有效约束单向阀片的形变范围，避免单向阀片的其他位置产生翘起形变，保证泄压稳定和杂质的沉积效果稳定。
在上述曲轴箱的通风结构中，所述沉积槽的底面朝所述单向阀片所在一侧倾斜。这样沉积在沉积槽的杂质会聚集在靠近单向阀片的一侧，可避免机油溢出回流凹槽时杂质随机油流出回流凹槽，保证沉积效果。
在上述曲轴箱的通风结构中，所述压力挡板通过绕压力挡板的周向布置的螺栓与所述回流凹槽的敞口端面固连。这样使单向阀片的固定点绕周向布置，利于提升单向阀片的密封效果。而且在维护时将单向阀片拆卸后可便捷清洗回流凹槽。
在上述曲轴箱的通风结构中，所述压力挡板上具有若干让位通孔。这样利于降低因压力挡板平整度不足导致单向阀片泄露的概率，保证单向阀片的密封效果。
在上述曲轴箱的通风结构中，所述通气室的内侧壁具有凸出的凸环，所述凸环的内腔形成所述回流凹槽，所述单向阀片固设于凸环上。这样提升回流凹槽内的油雾与通气室内较冷气体的换热效率，进而促进冷凝速度。
在上述曲轴箱的通风结构中，所述曲轴箱上设置有燃烧缸体和平衡缸体，所述回流凹槽位于所述平衡缸体的下方。这样回流 凹槽布置在不参与燃烧升温的平衡缸体下，利于降低通道内的环境温度，提升冷凝效果。
与现有技术相比，本发明的优点如下：
本曲轴箱的通风结构中曲轴箱内的带压气体会将单向阀片的上端顶开进行通气，而冷凝在单向阀片上的油雾则会滑落至回流凹槽下端处随着液面抬高缓慢回流，同时发动机磨合时产生的金属屑和其他杂质也会随带压气体排出时黏附汇集至单向阀片处，进而随机油沉积至回流凹槽下端处，避免流入润滑油路造成机械损伤，同时在维护时将单向阀片拆卸后可便捷清洗凹槽，实现曲轴室压力稳定的条件下保证机油循环质量。
附图说明
图1是本实施例中发动机的立体结构示意图。
图2是图1中P-P方向的剖面结构示意图。
图3是图2中的A部放大图。
图4是本实施例隐藏部分结构的立体爆炸结构示意图。
图5是图4中的B部放大图。
图中，1、曲轴室；2、通气室；
3、回流凹槽；31、沉积槽；32、通口；33、敞口；34、敞口端面；
4、单向阀片；41、自由端；
5、压力挡板；51、让位通孔；
6、螺栓；7、凸环；8、燃烧缸体；9、平衡缸体；10、曲轴箱。
具体实施方式
以下是本发明的具体实施例并结合附图，对本发明的技术方案作进一步的描述，但本发明并不限于这些实施例。
如图1和图2所示，本曲轴箱的通风结构中，曲轴箱10包括曲轴室1和通气室2，曲轴室1和通气室2连通。曲轴室1为容纳曲轴本体及连杆部件的腔室，通气室2与曲轴室1相邻布置，用于将曲轴室1内气压增加排出的气体导流利用，连通曲轴室1和通气室2，实现气体泄压顺畅流动。
如图2和图3所示，通风结构包括仅能使曲轴室1内的气体流入通气室2的单向阀片4。单向阀片4为条形的金属弹片或橡胶阀片。通气室2内侧壁上具有回流凹槽3，回流凹槽3具有敞口33，通气室2内侧壁上位于敞口33处具有敞口端面34，回流凹槽3的内腔与曲轴室1连通。单向阀片4上下方向设置并能将回流凹槽3的敞口33封闭，该单向阀片4的上端为自由端41，单向阀片4的下端固连于回流凹槽3的敞口端面34上，回流凹槽3的内腔底面开设有延伸至单向阀片4处的沉积槽31。单向阀片4可拆卸地固连在回流凹槽3的敞口端面34上。单向阀片4保证曲轴室1内部环境的封闭性；通过设置单向阀片4的上端为自由端41，并在回流凹槽3的下端处开设沉积槽31，这样曲轴箱10内的带压气体从曲轴室1进入到回流凹槽3内，接触并作用在单向阀片4上，一方面带压气体会将单向阀片4的上端顶开并排出，实现通气，另一方面随带压气体而来的呈油雾状的机油则会在接触单向阀片4时发生冷凝，冷凝在单向阀片4上的油雾则会在自身重力作用下滑落至沉积槽31内，同时发动机磨合时产生的金属屑和其他杂质也会随带压气体排出时黏附汇集至单向阀片4处，进而随机油沉积至沉积槽31内，避免流入润滑油路造成机械损伤，同时在维护时将单向阀片4拆卸后可便捷清洗沉积槽31，实现曲轴室1压力稳定的条件下保证机油循环质量。
进一步来讲，如图2-图5所示，回流凹槽3的敞口端面34连接有压力挡板5，单向阀片4夹持于压力挡板5和回流凹槽3的敞口端面34之间，该压力挡板5呈条形且压力挡板5的上端朝 远离单向阀片4的一侧弯曲。带压气体作用在单向阀片4的上端时，单向阀片4的上端朝压力挡板5的上端变形，将敞口33上侧部打开进行泄压。这样压力挡板5可有效约束单向阀片4的形变范围，避免单向阀片4的其他位置产生翘起形变，保证泄压稳定和杂质的沉积效果稳定。压力挡板5通过沿压力挡板5的周向布置的三个螺栓6与曲轴箱10固连。这样使单向阀片4的固定点绕周向布置，利于提升单向阀片4的密封效果。压力挡板5上具有三个让位通孔51。这样利于降低因压力挡板5平整度不足导致单向阀片4泄露的概率，保证单向阀片4的密封效果。作为优选，沉积槽31的底面自上而下朝单向阀片4所在一侧倾斜。这样沉积在沉积槽31的杂质会聚集在靠近单向阀片4的一侧，可避免机油溢出沉积槽31时杂质随机油流出沉积槽31，保证沉积效果。回流凹槽3的内壁具有自下而上与曲轴室1连通的通口32，通过通口32使回流凹槽3的内腔与曲轴室1连通，通口32与位于通口32下方的沉积槽31相对布置。曲轴箱10上设置有燃烧缸体8和平衡缸体9，燃烧缸体8和平衡缸体9可为现有总成，回流凹槽3位于平衡缸体9的下方。这样回流凹槽3布置在不参与燃烧升温的平衡缸体9下，利于降低回流凹槽3内的环境温度，提升冷凝效果。
如图4、图5所示，通气室2的内侧壁具有凸出的凸环7，凸环7的内腔形成回流凹槽3，凸环7背向曲轴室1的一端设置敞口33，凸环7上设有敞口33的端面为敞口端面34。这样提升回流凹槽3内的油雾与通气室2内较冷空气的换热效率，进而促进冷凝速度。
本文中所描述的具体实施例仅是对本发明精神作举例说明。本发明所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。

Claims (9)

  1. 一种曲轴箱的通风结构，曲轴箱(10)包括曲轴室(1)和通气室(2)，通风结构包括仅能使曲轴室(1)内气体流入通气室(2)的单向阀片(4)，其特征在于，所述通气室(2)的内侧壁上具有回流凹槽(3)，所述回流凹槽(3)的内腔与所述曲轴室(1)连通，所述单向阀片(4)上下方向设置且能将所述回流凹槽(3)的敞口(33)封闭，该单向阀片(4)的上端为自由端(41)，所述单向阀片(4)的下端固连于回流凹槽(3)的敞口端面(34)上。
  2. 根据权利要求1所述的曲轴箱的通风结构，其特征在于，所述回流凹槽(3)的内腔底面开设有延伸至单向阀片(4)处的沉积槽(31)。
  3. 根据权利要求2所述的曲轴箱的通风结构，其特征在于，所述沉积槽(31)的底面朝所述单向阀片(4)所在一侧倾斜设置。
  4. 根据权利要求2所述的曲轴箱的通风结构，其特征在于，所述回流凹槽(3)的内壁具有自下而上与所述曲轴室(1)连通的通口(32)，所述通口(32)与位于通口(32)下方的所述沉积槽(31)相对布置。
  5. 根据权利要求1或2或3或4所述的曲轴箱的通风结构，其特征在于，所述回流凹槽(3)的敞口(33)处连接有压力挡板(5)，所述单向阀片(4)夹持于所述压力挡板(5)和所述回流凹槽(3)的敞口端面(34)之间，该压力挡板(5)呈条形且压力挡板(5)的上端朝远离单向阀片(4)的一侧弯曲。
  6. 根据权利要求5所述的曲轴箱的通风结构，其特征在于，所述压力挡板(5)通过绕压力挡板(5)周向布置的螺栓(6)与所述回流凹槽(3)的敞口端面(34)固连。
  7. 根据权利要求5所述的曲轴箱的通风结构，其特征在于，所述压力挡板(5)上具有若干让位通孔(51)。
  8. 根据权利要求1或2或3或4所述的曲轴箱的通风结构， 其特征在于，所述通气室(2)的内侧壁具有凸出的凸环(7)，所述凸环(7)的内腔形成所述回流凹槽(3)，所述单向阀片(4)固设于凸环(7)上。
  9. 根据权利要求1所述的曲轴箱的通风结构，其特征在于，所述曲轴箱(10)上设置有燃烧缸体(8)和平衡缸体(9)，所述回流凹槽(3)位于所述平衡缸体(9)的下方。
PCT/CN2023/105633 2022-08-02 2023-07-04 一种曲轴箱的通风结构 WO2024027445A1 (zh)

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