WO2024027444A1 - 一种摩托车的发动机 - Google Patents

一种摩托车的发动机 Download PDF

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Publication number
WO2024027444A1
WO2024027444A1 PCT/CN2023/105632 CN2023105632W WO2024027444A1 WO 2024027444 A1 WO2024027444 A1 WO 2024027444A1 CN 2023105632 W CN2023105632 W CN 2023105632W WO 2024027444 A1 WO2024027444 A1 WO 2024027444A1
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WO
WIPO (PCT)
Prior art keywords
cylinder
piston
connecting rod
flange
motorcycle engine
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PCT/CN2023/105632
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English (en)
French (fr)
Inventor
张立成
金潮
高乐
姜龙
张林江
Original Assignee
浙江钱江摩托股份有限公司
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Publication of WO2024027444A1 publication Critical patent/WO2024027444A1/zh

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Classifications

    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • 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
    • F02B75/06—Engines with means for equalising torque
    • 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
    • F02B75/32—Engines characterised by connections between pistons and main shafts and not specific to preceding main groups

Definitions

  • the invention belongs to the technical field and relates to a motorcycle engine.
  • the commonly used reciprocating inertia force balance mechanism of single-cylinder engines is achieved by setting a balance shaft.
  • Balance purpose The balance shaft is parallel to the crankshaft, and the angular velocity of the balance shaft is equal to the angular velocity of the crankshaft.
  • the balance shaft is equipped with a balance weight; the balance shaft is connected to the crankshaft through a gear.
  • the component of the centrifugal force of the balance weight of the balance shaft in the direction parallel to its center line is combined into a force acting along the direction of the cylinder center line. Its magnitude is equal to the reciprocating inertial force but opposite in direction, thus achieving balance.
  • the patent application publication number CN114483361A discloses a crankshaft balancing device, which includes a crankshaft, a connecting rod, a functional piston and a balancing piston.
  • the functional piston is assembled in a corresponding cylinder to form a functional cylinder, which performs four strokes of intake-compression-power-exhaust. operation to achieve power output.
  • the balance piston is assembled in the corresponding cylinder barrel to form a balance cylinder. When the balance piston follows the crankshaft, it makes reciprocating motion in the corresponding cylinder barrel.
  • a through-ventilation hole is provided in the balance piston so that the top surface of the balance piston is connected with the crankcase to avoid large pumping losses during the intake and exhaust strokes of the engine and the accumulation of oil on the top surface of the piston.
  • the above structure can achieve multi-cylinder balanced small-displacement engine design by setting a balancing piston on the multi-cylinder crankcase, that is, setting a balancing piston on one of the functional cylinders on the multi-cylinder crankcase and changing it to a balancing cylinder.
  • the functional cylinders that originally perform work have great differences in structure and counterweight stress. Therefore, it is often difficult for the balance cylinder to maintain true balance after assembly.
  • the present invention provides a motorcycle engine.
  • the technical problem to be solved by the present invention is to control the cost while improving the balance effect.
  • a motorcycle engine includes a crankcase.
  • the crankcase is provided with two cylinder bores. The outer ends of the two cylinder bores are each connected to a combustion cylinder and a balance cylinder.
  • the combustion cylinder includes a cylinder. Barrel one and a piston one that slides in the cylinder barrel one.
  • the balance cylinder includes a cylinder barrel two and a piston two that slides in the cylinder barrel two.
  • the piston two has a vent hole that passes up and down.
  • the axis line of the combustion cylinder block and the axis line of the balance cylinder block are arranged crosswise to form a V shape
  • the second cylinder tube is arranged crosswise in the axial direction with the arrangement direction of the cylinder bore channel where the second cylinder tube is located
  • the cylinder tube The lower end of the second cylinder is inclined toward the side of the first cylinder relative to the direction in which the cylinder bore is located.
  • the crankcase is used to accommodate the crankshaft and connecting rod components.
  • Piston one is connected to the crankshaft, and piston two is also connected to the crankshaft.
  • a combustion cylinder block and a balance cylinder block that do not participate in work are provided at the two cylinder bores.
  • the combustion cylinder block can pass through The combustion work drives the piston 1 to drive the movement of the connecting rod and crankshaft.
  • the piston 2 in the balance cylinder is equipped with a vent hole and is driven by the crankshaft. It does not participate in work but is only used to balance the cylinder force of the combustion cylinder, realizing the design of a small displacement engine.
  • cylinder one and cylinder two are used to provide guidance for the movement of piston one and piston two respectively.
  • the lower end of the cylinder barrel 2 is tilted toward the side of the cylinder barrel 1 relative to the direction of the cylinder hole where the cylinder barrel 2 is located.
  • the arrangement direction of the second cylinder makes the angle between the movement direction of the second piston in the balance cylinder and the movement direction of the first piston in the combustion cylinder larger, realizing the original combustion
  • the effect of vibration is adaptively eliminated, and the vibration balance effect is improved while controlling production costs.
  • the balance cylinder further includes a cylindrical shape with an upper A connecting seat with a closed end, the second cylinder is connected to the connecting seat, the outer periphery of the connecting seat has a flange arranged around the circumference, the flange and the port surface of the cylinder hole where the second cylinder is located Solid connection.
  • the edge of the flange plate has a flange arranged around the circumference and extending downward.
  • the bottom surface of the flange is in contact with the port surface of the cylinder bore where the second cylinder is located.
  • the flange is fixedly connected to the crankcase through bolts arranged along the circumferential direction of the flange. In this way, when it is necessary to adjust the angle of the second cylinder, it can be achieved by grinding and turning the edge. The difficulty of grinding is lower, which reduces the requirements for process equipment and improves efficiency.
  • the outer diameter of the second cylinder is smaller than the minimum inner diameter of the cylinder hole where the second cylinder is located, and the lower end of the second cylinder is inserted into the cylinder hole where the second cylinder is located. This ensures that the second cylinder can provide sufficient guide stroke for the second piston, ensuring stable movement and balance effects.
  • crankshaft arm is connected to the crankcase.
  • the crankshaft arm includes a rocker arm and an axially arranged connecting rod neck.
  • the outer circumferential surface of the connecting rod neck is covered with a connecting rod and a connecting rod.
  • the end of the connecting rod is rotatably connected to the piston that can slide back and forth in the cylinder.
  • the end of the connecting rod is rotatably connected to the piston.
  • the outer diameter of the piston is the same as the piston.
  • the inner diameter of the second cylinder is adapted to fit the second cylinder, and the outer circumferential surface of the second piston is a straight cylindrical surface.
  • the first connecting rod and the second connecting rod are sleeved on the same connecting rod neck. This will help ensure the compact structure of the V-shaped engine, while reducing the influence of lateral unbalanced load between connecting rod one and connecting rod two, ensuring the balance effect.
  • the outer diameter of the second piston is smaller than the outer diameter of the first piston. This can reduce the structural size and inertial force of piston two, and improve While increasing the compactness of the structure, it also improves the balance effect.
  • the surface of the connecting seat has protruding and spaced-apart heat dissipation ribs.
  • the heat dissipation ribs can improve the heat accumulation inside the balance cylinder and ensure the heat dissipation effect of the balance cylinder.
  • the axis line of the first cylinder tube is perpendicular to the axis line of the second cylinder tube. In this way, a better vibration balancing effect of the balanced cylinder can be achieved while ensuring that the original crankcase can be used.
  • the original crankcase components can be used during the engine assembly process of this motorcycle, and the arrangement direction of the second cylinder makes the angle between the movement direction of the second piston in the balance cylinder and the movement direction of the first piston in the combustion cylinder larger, achieving
  • the original combustion cylinder is replaced with a balanced cylinder to adaptively eliminate the vibration effect, thereby improving the vibration balance effect while controlling production costs.
  • Figure 1 is a schematic three-dimensional structural diagram of this embodiment.
  • Figure 2 is a schematic cross-sectional structural diagram of this embodiment.
  • FIG. 3 is an enlarged view of part A in FIG. 2 .
  • Figure 4 is a schematic three-dimensional structural diagram of the partial structure of this embodiment.
  • Figure 5 is an exploded schematic diagram of the structure of the crankshaft arm and connecting rod piston in this embodiment.
  • crankcase 11. cylinder bore;
  • Combustion cylinder 21. Cylinder one; 22. Connecting rod one; 23. Piston one;
  • the engine of this motorcycle includes a crankcase 1.
  • the crankcase 1 has two cylinder bores 11 arranged in a V-shape with an included angle of 80 degrees.
  • the two cylinder bores 11 are connected respectively.
  • the combustion cylinder 2 includes a cylinder barrel 21 and a piston 23 that is slidably fitted in the cylinder barrel 21 .
  • the balance cylinder 3 includes a cylinder barrel 2 31 and a piston 2 that is slidably fitted in the cylinder barrel 2 31 . 33.
  • the lower end of the second cylinder 31 is inclined toward the side where the first cylinder 21 is located relative to the arrangement direction of the cylinder bore 11 where the second cylinder 31 is located.
  • the crankcase 1 is used to accommodate the crankshaft arm 4, connecting rod one 22 and connecting rod two 32.
  • the first piston 23 is connected to the crankshaft arm 4 through the connecting rod 22, and the second piston 33 is connected to the crankshaft arm 4 through the connecting rod.
  • 2 32 is connected to the crankshaft arm 4, and the two cylinder bores 11 are arranged in a V shape, and are respectively provided with a combustion cylinder 2 and a balance cylinder 3 that do not participate in work.
  • the combustion cylinder 2 can drive the piston 21 to drive the connecting rod through combustion work.
  • Rod one 22 and crankshaft arm 4 move, and piston two 33 in the balance cylinder 3 is provided with a vent hole 331 and is driven by the crankshaft arm 4. It does not participate in doing work but is only used to balance the cylinder force of the combustion cylinder 2 to achieve small displacement. Quantity engine design.
  • Cylinder one 21 and cylinder two 31 are used to provide guidance for the movement of piston one 23 and piston two 33 respectively; by setting the lower end of cylinder two 31 relative to the setting direction of cylinder bore 11 where cylinder two 31 is located, toward cylinder one The side where 21 is located is deflected, so that the original crankcase 1 part can be used during the engine assembly process, and the setting direction of the cylinder barrel 2 31 balances the movement direction of the piston 2 33 in the cylinder 3 with the direction of the piston 23 in the combustion cylinder 2.
  • the included angle between the movement directions is larger, achieving the effect of adaptively eliminating vibration after replacing the original combustion cylinder 2 with the balancing cylinder 3, and improving the vibration balance effect while controlling production costs.
  • a crankshaft arm 4 is connected to the crankcase 1.
  • the outer peripheral surface of the crankshaft arm 4 is covered with a connecting rod 22 and a connecting rod 32.
  • the end of the connecting rod 22 is connected to the connecting rod 22.
  • the piston one 23 that can slide back and forth in the cylinder tube 21 is rotatably connected, and the end of the connecting rod 32 is rotationally connected with the piston two 33 that can slide back and forth in the cylinder tube two 31.
  • the piston The end surface of the second piston 33 has a through ventilation hole 331.
  • the outer diameter of the second piston 33 matches the inner diameter of the second cylinder 31.
  • the second piston 33 The outer peripheral surface is a straight cylinder.
  • the crankshaft arm 4 includes a rocker arm 42 and an axially arranged connecting rod neck 41.
  • the first connecting rod 22 and the second connecting rod 32 are sleeved on the same connecting rod neck 41. This will help ensure the compact structure of the V-shaped engine, while reducing the influence of the lateral unbalanced load between the first connecting rod 22 and the second connecting rod 32 to ensure the balance effect.
  • the outer diameter of piston two 33 is smaller than the outer diameter of piston one 23 . This can reduce the structural size and inertial force of piston two 33, improve the compactness of the structure, and improve the balance effect.
  • the axis line of cylinder one 21 is perpendicular to the axis line of cylinder two 31. In this way, a better vibration balancing effect of the balanced cylinder 3 can be achieved while ensuring that the original crankcase 1 can be used.
  • the balance cylinder 3 also includes a connecting seat 34 that is cylindrical and has a closed upper end.
  • the second cylinder 31 is connected to the connecting seat 34.
  • the outer periphery of the connecting seat 34 has a circumferential arrangement.
  • the flange 35 is fixedly connected to the port surface of the cylinder bore 11 where the second cylinder 31 is located.
  • the edge of the flange 35 has a flange 351 arranged around the circumference and extending downward, and the bottom surface of the flange 351 Fitted with the port surface of the cylinder bore 11 where the second cylinder 31 is located, the flange 35 is fixedly connected to the crankcase 1 through bolts 5 arranged along the circumferential direction of the flange 351 .
  • the outer periphery of the connecting base 34 has heat dissipation ribs 36 arranged circumferentially and spaced up and down. In this way, the heat dissipation ribs 36 can improve the heat accumulation inside the balance cylinder 3 and ensure the heat dissipation effect of the balance cylinder 3 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

本发明提供了一种摩托车的发动机，属于摩托车技术领域。它解决了现有摩托车的发动机直改小排量后不易保持振动平衡的技术问题。本摩托车的发动机包括曲轴箱(1)，曲轴箱(1)上具有两个缸体孔道(11)，两个缸体孔道(11)的外端处各连接有燃烧缸体(2)和平衡缸体(3)，燃烧缸体(2)包括缸筒一(21)，平衡缸体(3)包括缸筒二(31)和滑动配合于缸筒二(31)内的活塞二(33)，活塞二(33)上具有上下贯通的通气孔(331)，燃烧缸体(2)的轴心线和平衡缸体(3)的轴心线交叉布置呈V形，缸筒二(31)沿轴向与其所在缸体孔道(11)的设置方向交叉布置，且该缸筒二(31)的下端相对该缸体孔道(11)的设置方向朝缸筒一(21)所在的一侧偏斜。摩托车发动机在控制设计成本的同时能保证振动平衡效果。

Description

一种摩托车的发动机 技术领域
本发明属于技术领域，涉及一种摩托车的发动机。
背景技术
随着国家排放及油耗的法规不断加严，小排量发动机的研发需求增加，单缸发动机排量小但其振动明显，常用的单缸发动机的往复惯性力平衡机构是通过设置平衡轴来达到平衡的目的。平衡轴平行于曲轴，平衡轴的角速度等于曲轴的角速度，平衡轴上装有平衡重；平衡轴通过齿轮与曲轴联接。平衡轴的平衡重离心力在平行于其中心线方向的分力则合成一个沿气缸中心线方向作用的力，其大小与往复惯性力相等而方向相反，这样就达到了平衡。
申请公布号为CN114483361A的专利公开了一种曲轴平衡装置，包括曲轴、连杆、功能活塞和平衡活塞，功能活塞装配在对应缸筒中形成功能缸，进行进气-压缩-做功-排气四冲程运转，实现动力输出。平衡活塞装配在对应缸筒中形成平衡缸，平衡活塞跟随曲轴运转时在对应的缸筒中做往复运动。平衡活塞中设置贯通的通气孔，使得平衡活塞顶面与曲轴箱相通，避免发动机进气及排气冲程产生较大的泵气损失以及机油在活塞顶面堆积。
上述结构通过在多缸曲轴箱上设置平衡活塞，即将多缸曲轴箱上的其中一个功能缸设置平衡活塞后改为平衡缸使用，可实现多缸平衡的小排量发动机设计，但平衡缸与原本做功的功能缸在结构和配重受力等方面都具有较大差别，因此平衡缸在装配后往往难以保持真正的平衡。
发明内容
本发明针对现有的技术存在的上述问题，提供一种摩托车的发动机，本发明所要解决的技术问题是：实现控制成本的同时改善平衡效果。
本发明的目的可通过下列技术方案来实现：
一种摩托车的发动机，包括曲轴箱，所述曲轴箱上具有两个缸体孔道，两个缸体孔道的外端处各连接有燃烧缸体和平衡缸体，所述燃烧缸体包括缸筒一和滑动配合于缸筒一内的活塞一，所述平衡缸体包括缸筒二和滑动配合于缸筒二内的活塞二，所述活塞二上具有上下贯通的通气孔，其特征在于，所述燃烧缸体的轴心线和平衡缸体的轴心线交叉布置呈V形，所述缸筒二沿轴向与缸筒二所在缸体孔道的设置方向交叉布置，且该缸筒二的下端相对于缸筒二所在缸体孔道的设置方向朝所述缸筒一所在的一侧偏斜。
曲轴箱用于容置曲轴和连杆部件，活塞一与曲轴连接，活塞二也与曲轴连接，两个缸体孔道处各设置燃烧缸体和不参与做功的平衡缸体，燃烧缸体可通过燃烧做功驱动活塞一带动连杆和曲轴运动，平衡缸体中的活塞二设有通气孔由曲轴带动运动，不参与做功而仅用于平衡燃烧缸体的缸力，实现小排量发动机的设计，缸筒一和缸筒二分别用于为活塞一和活塞二的运动提供导向。通过设置燃烧缸体的轴心线和平衡缸体的轴心线交叉布置呈V形，使缸筒二的下端相对于缸筒二所在缸体孔道的设置方向朝缸筒一所在一侧偏斜，这样发动机组装过程中可利用原有曲轴箱部件，而缸筒二的设置方向使平衡缸体中的活塞二运动方向与燃烧缸体活塞一的运动方向之间夹角更大，实现原燃烧缸体替换为平衡缸体后适应性消解振动的效果，在控制生产成本的同时改善振动平衡效果。
在上述摩托车的发动机中，所述平衡缸体还包括呈筒状且上 端封闭的连接座，所述缸筒二连接于所述连接座内，该连接座的外周具有绕周向设置的法兰盘，所述法兰盘与缸筒二所在缸体孔道的端口面固连。这样平衡缸体可稳定连接在原有的曲轴箱部件上，而连接座在安装调试时可根据缸筒二的角度需求进行适用性打磨修正，保证平衡效果。
在上述摩托车的发动机中，所述法兰盘的边沿处具有绕周向布置且朝下延伸的翻沿，所述翻沿的底面与缸筒二所在缸体孔道的端口面贴合，该法兰盘通过沿所述翻沿的环绕方向布置的螺栓与所述曲轴箱固连。这样当需要调试缸筒二的角度时通过打磨翻沿即可实现，打磨的难度更低，降低对工艺设备的要求，提高效率。
在上述摩托车的发动机中，所述缸筒二的外径尺寸小于缸筒二所在缸体孔道的最小内径尺寸，该缸筒二的下端插设于缸筒二所在的缸体孔道内。这样保证缸筒二能为活塞二提供足够的导向行程，保证运动及平衡效果稳定。
在上述摩托车的发动机中，所述曲轴箱内连接有曲轴臂，所述曲轴臂包括摇臂和轴向设置的连杆颈，所述连杆颈外周面套设有连杆一和连杆二，所述连杆一的端部与可在所述缸筒一内往复滑动的活塞一转动连接，所述连杆二的端部与活塞二转动连接，该活塞二的外径尺寸与所述缸筒二的内径尺寸相适配，所述活塞二的外周面为直柱面。这样平衡缸体中的活塞二外周未设置活塞环结构，降低了活塞二的运动阻力，进而更精准地平衡燃烧缸体产生的缸力，保证发动机振动状态稳定。
在上述摩托车的发动机中，所述连杆一和所述连杆二套设于同一所述连杆颈上。这样利于保证V型发动机的结构紧凑性，同时降低连杆一和连杆二之间横向偏载的影响，保证平衡效果。
在上述摩托车的发动机中，所述活塞二的外径尺寸小于所述活塞一的外径尺寸。这样可降低活塞二的结构尺寸和惯性力，提 升结构紧凑性的同时，改善平衡效果。
在上述摩托车的发动机中，所述连接座的表面具有凸出且间隔布置的散热筋。这样散热筋可改善平衡缸体内部积热的现象，保证平衡缸体的散热效果。
在上述摩托车的发动机中，所述缸筒一的轴心线和缸筒二的轴心线相垂直。这样在保证原曲轴箱可利用的条件下，实现平衡缸体更优的振动平衡效果。
与现有技术相比，本发明的优点如下：
本摩托车的发动机组装过程中可利用原有曲轴箱部件，而缸筒二的设置方向使平衡缸体中的活塞二运动方向与燃烧缸体活塞一的运动方向之间夹角更大，实现原燃烧缸体替换为平衡缸体后适应性消解振动的效果，在控制生产成本的同时改善振动平衡效果。
附图说明
图1是本实施例的立体结构示意图。
图2是本实施例的剖面结构示意图。
图3是图2中的A部放大图。
图4是本实施例局部结构的立体结构示意图。
图5是本实施例中曲轴臂与连杆活塞结构的爆炸示意图。
图中，1、曲轴箱；11、缸体孔道；
2、燃烧缸体；21、缸筒一；22、连杆一；23、活塞一；
3、平衡缸体；31、缸筒二；32、连杆二；33、活塞二；331、通气孔；34、连接座；35法兰盘；351、翻沿；36、散热筋；
4、曲轴臂；41、连杆颈、42、摇臂；5、螺栓。
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，本摩托车的发动机包括曲轴箱1，曲轴箱1上具有两个夹角为80度而V形布置的缸体孔道11，两个缸体孔道11处分别连接有燃烧缸体2和不参与做功的平衡缸体3。结合图3所示，燃烧缸体2包括缸筒一21和滑动配合于缸筒一21内的活塞一23，平衡缸体3包括缸筒二31和滑动配合于缸筒二31内的活塞二33，缸筒二31的下端相对缸筒二31所在缸体孔道11的设置方向朝缸筒一21所在一侧偏斜。结合图4和图5所示，曲轴箱1用于容置曲轴臂4、连杆一22和连杆二32，活塞一23通过连杆一22与曲轴臂4连接，活塞二33通过连杆二32与曲轴臂4连接，两个缸体孔道11呈V形布置，并分别设置燃烧缸体2和不参与做功的平衡缸体3，燃烧缸体2可通过燃烧做功驱动活塞一21带动连杆一22和曲轴臂4运动，平衡缸体3中的活塞二33设有通气孔331并由曲轴臂4带动运动，不参与做功而仅用于平衡燃烧缸体2的缸力，实现小排量发动机的设计。缸筒一21和缸筒二31用于分别为活塞一23和活塞二33的运动提供导向；通过设置缸筒二31的下端相对缸筒二31所在缸体孔道11的设置方向朝缸筒一21所在一侧偏斜，这样发动机组装过程中可利用原有曲轴箱1部件，而缸筒二31的设置方向使平衡缸体3中的活塞二33运动方向与燃烧缸体2活塞一23的运动方向之间夹角更大，实现原燃烧缸体2替换为平衡缸体3后适应性消解振动的效果，在控制生产成本的同时改善振动平衡效果。
具体来讲，如图4和图5所示，曲轴箱1内连接有曲轴臂4，曲轴臂4的外周面套设有连杆一22和连杆二32，连杆一22的端部与可在缸筒一21内往复滑动的活塞一23转动连接，连杆二32的端部与可在缸筒二31内往复滑动的活塞二33转动连接，结合图2和图3所示，活塞二33的端面具有贯通的通气孔331，该活塞二33的外径尺寸与缸筒二31的内径尺寸相适配，活塞二33 的外周面为直柱面。这样平衡缸体3中的活塞二33外周未设置活塞环结构，降低了活塞二33的运动阻力，进而更精准地平衡燃烧缸体2产生的缸力，保证发动机振动状态稳定。如图2所示，缸筒二31的外径尺寸小于缸筒二31所在缸体孔道11的最小内径尺寸，该缸筒二31的下端插设于缸筒二31所在的缸体孔道11内。如图4和图5所示，曲轴臂4包括摇臂42和轴向设置的连杆颈41，连杆一22和连杆二32套设于同一连杆颈41上。这样利于保证V型发动机的结构紧凑性，同时降低连杆一22和连杆二32之间横向偏载的影响，保证平衡效果。作为优选，活塞二33的外径尺寸小于活塞一23的外径尺寸。这样可降低活塞二33的结构尺寸和惯性力，提升结构紧凑性的同时，改善平衡效果。缸筒一21的轴心线和缸筒二31的轴心线相垂直。这样在保证原曲轴箱1可利用的条件下，实现平衡缸体3更优的振动平衡效果。
如图1-图4所示，平衡缸体3还包括呈筒状且上端封闭的连接座34，缸筒二31连接于连接座34内，该连接座34的外周具有绕周向设置的法兰盘35，法兰盘35与缸筒二31所在缸体孔道11的端口面固连，法兰盘35的边沿处具有绕周向布置且朝下延伸的翻沿351，翻沿351的底面与缸筒二31所在缸体孔道11的端口面贴合，该法兰盘35通过沿翻沿351的环绕方向布置的螺栓5与所述曲轴箱1固连。这样螺栓5与连接座34之间具有更大的配合长度，避免在连接处产生形变导致尺寸偏差，保证平衡缸体3的位置精度，保证平衡效果。连接座34的外周具有绕周向布置且上下间隔布置的散热筋36。这样散热筋36可改善平衡缸体3内部积热的现象，保证平衡缸体3的散热效果。
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. 一种摩托车的发动机，包括曲轴箱(1)，所述曲轴箱(1)上具有两个缸体孔道(11)，两个缸体孔道(11)的外端处分别连接有燃烧缸体(2)和平衡缸体(3)，所述燃烧缸体(2)包括缸筒一(21)和滑动配合于缸筒一(21)内的活塞一(23)，所述平衡缸体(3)包括缸筒二(31)和滑动配合于缸筒二(31)内的活塞二(33)，所述活塞二(33)上具有上下贯通的通气孔(331)，其特征在于，所述燃烧缸体(2)的轴心线和平衡缸体(3)的轴心线交叉布置呈V形，所述缸筒二(31)沿轴向与缸筒二(31)所在缸体孔道(11)的设置方向交叉布置，且该缸筒二(31)的下端相对于缸筒二(31)所在缸体孔道(11)的设置方向朝所述缸筒一(21)所在的一侧偏斜。
  2. 根据权利要求1所述的摩托车的发动机，其特征在于，所述平衡缸体(3)还包括呈筒状且上端封闭的连接座(34)，所述缸筒二(31)连接于所述连接座(34)内，该连接座(34)的外周具有绕周向设置的法兰盘(35)，所述法兰盘(35)与缸筒二(31)所在缸体孔道(11)的端口面固连。
  3. 根据权利要求2所述的摩托车的发动机，其特征在于，所述法兰盘(35)的边沿处具有绕周向布置且朝下延伸的翻沿(351)，所述翻沿(351)的底面与缸筒二(31)所在缸体孔道(11)的端口面贴合，该法兰盘(35)通过沿所述翻沿(351)的环绕方向布置的螺栓(5)与所述曲轴箱(1)固连。
  4. 根据权利要求1或2或3所述的摩托车的发动机，其特征在于，所述缸筒二(31)的外径尺寸小于缸筒二(31)所在缸体孔道(11)的最小内径尺寸，该缸筒二(31)的下端插设于缸筒二(31)所在的缸体孔道(11)内。
  5. 根据权利要求2或3所述的摩托车的发动机，其特征在于，所述连接座(34)的外周面具有若干绕周向设置的散热筋(36)，若干所述散热筋(36)沿连接座(34)的轴向上下间隔。
  6. 根据权利要求1或2或3所述的摩托车的发动机，其特征在于，所述缸筒一(21)的轴心线和缸筒二(31)的轴心线相垂直。
  7. 根据权利要求1或2或3所述的摩托车的发动机，其特征在于，所述曲轴箱(1)内连接有曲轴臂(4)，所述曲轴臂(4)包括摇臂(42)和轴向设置的连杆颈(41)，所述连杆颈(41)的外周面套设有连杆一(22)和连杆二(32)，所述连杆一(22)的端部与可在所述缸筒一(21)内往复滑动的活塞一(23)转动连接，所述活塞二(33)转动连接于连杆二(32)的端部，该活塞二(33)的外径尺寸与所述缸筒二(31)的内径尺寸相适配，所述活塞二(33)的外周面为直柱面。
  8. 根据权利要求7所述的摩托车的发动机，其特征在于，所述连杆一(22)和所述连杆二(32)套设于同一所述连杆颈(41)上。
  9. 根据权利要求7所述的摩托车的发动机，其特征在于，所述活塞二(33)的外径尺寸小于所述活塞一(23)的外径尺寸。
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