WO2009065315A1 - An electric starting flywheel for gasoline engine - Google Patents

An electric starting flywheel for gasoline engine Download PDF

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Publication number
WO2009065315A1
WO2009065315A1 PCT/CN2008/072144 CN2008072144W WO2009065315A1 WO 2009065315 A1 WO2009065315 A1 WO 2009065315A1 CN 2008072144 W CN2008072144 W CN 2008072144W WO 2009065315 A1 WO2009065315 A1 WO 2009065315A1
Authority
WO
WIPO (PCT)
Prior art keywords
flywheel
gasoline engine
disk
disc
engine according
Prior art date
Application number
PCT/CN2008/072144
Other languages
French (fr)
Chinese (zh)
Inventor
Huayang Jing
Bibo Che
Yong Luo
Mingsong Chen
Original Assignee
Loncin Industry Co., Ltd
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 Loncin Industry Co., Ltd filed Critical Loncin Industry Co., Ltd
Publication of WO2009065315A1 publication Critical patent/WO2009065315A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/30—Flywheels

Definitions

  • the present invention relates to a starter flywheel of an engine, and more particularly to an electric start flywheel of a gasoline engine.
  • a starter flywheel of a gasoline engine is typically mounted at one end of the crankshaft and has the function of initiating engine ignition and inertia reset.
  • the outer circumference of the flywheel disc of the existing electric starting flywheel needs to cooperate with a driven gear, and the driven gear meshes with the gear on the shaft of the starting motor, and the power of the starting motor drives the flywheel to rotate, thereby driving the crankshaft to start. engine.
  • the flywheel disk 20 of the electric starter flywheel of the conventional gasoline engine is generally cast iron.
  • the wall thickness of the flywheel disk must be 10 mm or more to ensure its strength and rigidity, so that it can form with the driven gear 21. A firm interference fit that does not distract from the torque when transmitting power.
  • the flywheel made of this cast iron requires strength and rigidity, resulting in heavy weight, large rotational inertia, long braking time, and can not be completely stopped within 3 seconds, so it cannot be used for machinery such as a lawnmower.
  • the braking of the small engine must be stopped within 3 seconds, and the flywheel disc of this cast iron structure also has the disadvantages of large machining allowance, poor heat dissipation, low production efficiency, and pollution of the environment, and its weak strength is easy. Cracking, scrapping the flywheel.
  • the object of the present invention is to provide an electric start flywheel for a gasoline engine, which has a flywheel disk formed by drawing a concave cavity and an electric starting driven tooth by deep drawing of a steel plate, in view of the deficiencies of the prior art.
  • the starting flywheel comprises a flywheel disc, an inner and outer magnet steel fixed on the flywheel disc, and a balance weight block, wherein the flywheel disc is formed by drawing and forming a concave moon and electric a flywheel disc that activates the driven tooth, the driven tooth being located at a ring extending outward from the mouth of the concave portion of the flywheel disc On the folded edge of the flywheel.
  • the flywheel disk has a wall thickness of 2 to 5 mm. Since the above scheme is adopted, the flywheel disk of the electric starting flywheel is a flywheel disk formed by drawing and forming a concave moon and an electric starting driven tooth by a steel plate, and the flywheel disk has a wall thickness of 2 to 5 mm. Compared with the existing cast iron or aluminum alloy flywheel, the flywheel disc made of steel plate has a wall thickness of 2 ⁇ 5mm, which reduces the weight of the entire flywheel, reduces the rotational inertia, and can brake within 3 seconds. It can be used for small general-purpose gasoline engines, especially for small machines that require full braking in a short period of time. It has a wide range of applications.
  • the electric starting driven tooth of the flywheel is a stamped and formed structure, and is formed integrally with the flywheel plate as a steel plate, avoiding the interference of the electric starting driven gear of the existing cast iron and aluminum alloy flywheel. Defects on the flywheel disc, even if the large torque does not detach the driven gear from the flywheel, the performance of the flywheel transmitting torque is guaranteed.
  • the flywheel disc with concave cavity and electric starting driven tooth is formed by drawing deep drawing with steel plate, and its strength and wear resistance are superior to those of cast iron and aluminum alloy. The service life of the flywheel is greatly extended.
  • the electric starting driven teeth on the flywheel disk are formed by stamping, and the processing technology is simple, the production efficiency is high, the use of raw materials is small, and the manufacturing cost of the flywheel is effectively reduced.
  • the shaft center of the flywheel shaft is a stepped cylinder with a tapered hole, and a small-diameter end is provided with a cutting surface.
  • the through hole of the flywheel shaft is a semi-circular hole, and the small diameter end of the sleeve is inserted into the flywheel. In the through hole provided by the disk shaft center, after the cutting surface of the bushing is formed in a circumferentially fixed connection with the chord side of the through hole, the bushing is welded and fixed to the flywheel disk.
  • connection between the sleeve and the flywheel is made stronger, and the circumferential direction of the chord of the arc-shaped semi-circular hole of the flywheel shaft is formed by the cutting plane of the sleeve, which can meet the transmission of large torque and make the torque transmission more reliable.
  • a circumferential limiting structure for the manual starting device is arranged on the outer side of the axial end wall of the flywheel disc, and the circumferential limiting structure can be artificial when the artificial starting device of the flywheel needs to be installed.
  • the starting device forms a circumferential limit transmission torque, so that the electric starting flywheel can also be equipped with a manual starting device for transmitting the starting torque for the manually activated gasoline engine, which increases the versatility of the flywheel.
  • FIG. 1 is a schematic structural view of the present invention
  • FIG. 2 is a cross-sectional structural view taken along line AA of FIG. 1
  • 4 is a view showing an embodiment of the present invention for manual starting
  • FIG. 5 is another embodiment of the structure of the bracket of the present invention
  • FIG. 6 is an electric starting flywheel manufactured by the prior art cast iron.
  • a flywheel disk 1 of an electric starter flywheel of the present invention is a flywheel disk formed by drawing a concave cavity 7 and an electric starting driven tooth 5 by a steel plate.
  • the driven tooth 5 is located on the flange 14 of the flywheel disk which is folded outwardly from the mouth of the cavity 7 of the flywheel disk 1.
  • the flange 14 is integral with the flywheel disk 1 and perpendicular to the axis of the flywheel disk 1
  • the driven teeth 5 are press-formed on the circumference of the flange 14.
  • a groove is provided on the circumferential surface of the flywheel disk 1, and a bracket 10 for fixing the outer magnet steel is provided in the cavity of the flywheel disk 1 corresponding to the port.
  • the bracket 10 is bent into a groove and fixedly attached to the inner wall of the circumference of the flywheel disc 1, and the same effect can be achieved by welding or riveting on the inner wall of the circumference of the flywheel disc 1.
  • An outer magnetic steel is disposed in the groove of the bracket 10 corresponding to the opening on the circumferential surface of the flywheel disc 1, and is pressed by the pressing plate 6, and a screw 12 is fastened through the pressing plate 6 and the outer magnetic steel 2 to the bracket 10, and the outer portion is externally connected.
  • the magnet 2 is fixed to the bracket 10.
  • the pressure plate 6 has the same arc shape as the circumferential arc of the flywheel disc 1 and is installed in the mouth on the circumferential surface of the flywheel disc 1 to ensure the uniformity of the circumferential curved surface of the flywheel disc 1.
  • the circumferential inner wall of the flywheel disk 1 to which the outer magnet 2 is attached is fastened to a balance weight 13 by screws 9, and the weight 13 can be used with different weights according to the weight balance.
  • the two inner magnetic steels 4 are symmetrically mounted on the inner circumferential wall of the flywheel disc 1 and are respectively fixed to the flywheel disc by screws, and are disposed at 90 degrees with the mounting position of the outer magnet steel 2, respectively.
  • the flywheel disc 1 is axially fixedly connected to a sleeve 3 whose axis is a tapered hole.
  • the sleeve 3 is a stepped cylinder, and the small diameter end thereof is inserted into the through hole provided in the axial center of the flywheel disc 1 and is fixedly connected to the flywheel in the circumferential direction.
  • the through hole provided in the axial center of the flywheel 1 is a through hole which can be circumferentially positioned.
  • the through hole in this embodiment is a superior arc semicircular hole, and the chord 15 is a circumferential positioning edge, and the small diameter end of the sleeve 1 is provided.
  • the small diameter end of the sleeve 3 is inserted into the through hole provided in the axial center of the flywheel disc 1.
  • the shoulder is closely attached to the end wall of the flywheel 1 And welded and fixed.
  • the joint can be subjected to a large torque to ensure the stability of the torque transmission, and at the same time, the sleeve 3 and the flywheel 1 can be prevented from being relatively displaced during welding, and the welding is facilitated.
  • the sleeve 3 can be located in the cavity 7 of the flywheel 1 and welded to the flywheel 1 or the sleeve 3 can also be located on the flywheel 1 axis.
  • the flywheel disc 1 is welded and fixed to the outside of the end wall.
  • An impeller 18 is circumferentially fixed by four uniformly distributed bolts outside the axial end wall of the flywheel disc 1.
  • the outer side of the axial end wall of the flywheel disc 1 is provided with a circumferential limiting structure for the manual starting device 17 offset from the axial center.
  • the circumferential limiting structure of the pair of manual starting devices is a limiting block 16 formed by punching on the axial end wall of the flywheel disc 1.
  • the limiting block 16 and the flywheel disc 1 are integrated, and the axial end wall of the flywheel disc 1 is The outer fold is convex, forming a limitable block 16 for transmitting torque, the limit block 16 is located near the axial through hole of the flywheel 1; or the circumferential limit structure of the manual starting device 17 can also be set as a limit hole. Referring to FIG.
  • the eccentric pin 19 or the protrusion provided on the axial end surface of the manual starting device 17 can be in contact with the limiting block 16, or inserted into the limiting hole.
  • the limiting block 16 is formed by punching and folding the notched side of the chord edge 15 of the superior arc semi-circular through hole provided at the axial end wall of the flywheel disc 1 to ensure the strength of the torque.
  • the tapered hole wall of the sleeve 3 is provided with a key groove 11 which is circumferentially fixed when connected to the crankshaft, and is assembled to the crankshaft to form a circumferentially fixed connection with the crankshaft.
  • the flywheel disc has a wall thickness of 2 - 5 mm, and the thickness within the range is determined according to the size of the engine, so as to satisfy the start of the ignition and inertia reset of the flywheel of various types of small gasoline engines, and can be in 3 seconds.
  • the internal brake stops Referring to Fig.
  • the present invention is not limited to the above embodiment, and the bracket 10 for fixing the outer magnet 2 is bent into a groove and integrally formed with the port on the circumferential surface of the flywheel 1 so that the bracket 10 and the flywheel 1 are A monolithic structure that reduces assembly effort.
  • a protective sleeve 8 may be provided to protect the outer magnetic steel 2, and the protective sleeve 8 and the outer magnetic steel 2 are pressed together by the pressing block 6 in the groove of the bracket.
  • the through hole for circumferentially positioning the sleeve provided by the axial end wall of the flywheel disc 1 may also be a spline hole, a square hole, or the like, and the small diameter end of the sleeve 3 Corresponding to the external splines, square heads, etc., which are matched with them, the circumferential positioning connection between the sleeve and the flywheel can also be achieved, and a large torque is transmitted.
  • the flywheel of the invention is usually mounted on the crankshaft of the electrically activated gasoline engine, and the driven teeth on the flywheel disk mesh with the gears on the engine starter motor shaft, so that the power of the starter motor can be transmitted to the flywheel disk, and the flywheel disk drives the crankshaft to start.
  • the engine which realizes the electric start of the gasoline engine. Referring to Figure 4, if the flywheel needs to be used on a manually activated gasoline engine, only the eccentric pin or the raised manual starting device on the end face of the shaft is required to face the axial end face of the flywheel, and the flywheel, impeller and manual starting device are installed in sequence.
  • the eccentric pin or protrusion of the manual starting device is in contact with the limit block of the end face of the flywheel disc, or inserted into the limit hole of the end face of the flywheel shaft to form a circumferential limit, and the torque is transmitted. .
  • the flywheel can be rotated, and the flywheel drives the crankshaft to start the engine, thereby realizing the manual starting of the gasoline engine.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

An electric starting flywheel for gasoline engine includes a flywheel disc (1), inner magnetic steels (4), an outer magnetic steel (2) and a balance block (13) mounted on the flywheel disc (1), wherein the flywheel disc (1) with a concave chamber (7) and electric starting driven gear teeth (5) is formed by stretching and pressing a steel plate, the driven gear teeth (5) are arranged on a hem (14) of a ring flywheel disc, which is on the edge of the flywheel disc concave chamber (7) extending and folding outwards, and the hem (14) is integrated with the flywheel disc (1). Not only it can reduce the weight of the flywheel, decrease the rotation inertia of the flywheel and stop totally the rotation of the flywheel in three seconds, but also it can make the torque transmitted by the electric starting driven gear teeth (5) steady and reliable and prolong the service lifetime of the flywheel.

Description

汽油发动机的电启动飞轮  Electric start flywheel for gasoline engine
技术领域 本发明涉及一种发动机的启动飞轮，特别涉及一种汽油发动机的电启动 飞轮。 背景技术 汽油发动机的启动飞轮通常安装在曲轴一端 ,具有启动发动机点火和惯 性复位的功能。 现有的电启动飞轮的飞轮盘的外圓周上需过盈配合一个从动 齿轮， 从动齿轮与启动电机轴上的齿轮啮合， 由启动电机的动力带动飞轮盘 旋转， 由此带动曲轴转动启动发动机。 参见图 6, 而现有的汽油发动机的电 启动飞轮的飞轮盘 20一般为铸铁制作件， 飞轮盘的壁厚须在 10mm以上， 以保证其强度和刚度， 使其能够与从动齿轮 21 形成牢固的过盈配合， 在传 递动力时， 不会因扭矩较大而脱离。 但是这种铸铁制作的飞轮盘因需要保证 强度和刚度， 导致重量重， 旋转惯性大， 制动时间长， 不能在 3秒钟内完全 停止， 因此就不能满足用于如剪草机这样的机械的小型发动机的制动必须在 3 秒钟内停止的要求， 而且这种铸铁结构的飞轮盘还存在加工余量大， 散热 差， 生产效率低， 加工污染环境等不足， 其强度薄弱的部位容易崩裂， 使飞 轮报废。 为减轻飞轮盘的重量， 减小其惯性， 也有的飞轮盘釆用铝合金铸造 制作， 但是铝合金制作的飞轮强度低， 其关键部位易磨损， 存在使用寿命不 长的问题， 尤其是铝合金材料的成本高， 增加了企业或用户的负担。 发明内容 本发明的目的是针对现有技术的不足，提供一种汽油发动机的电启动飞 轮， 它的飞轮盘釆用由钢板拉深冲压成形有凹腔和电启动从动齿的飞轮盘， 既减轻了飞轮的重量， 能减小飞轮旋转惯性， 实现制动时在 3秒钟内就能完 全停止转动， 又能保证电启动从动齿传递扭矩的稳定可靠性， 延长飞轮的使 用寿命。 本发明的目的是这样实现的： 该启动飞轮包括飞轮盘、 固定在飞轮盘上 的内、 外磁钢和平衡配重块， 所述飞轮盘为由钢板拉深冲压成形有凹月空和电 启动从动齿的飞轮盘， 所述从动齿位于由飞轮盘凹腔口部向外折转延伸的环 飞轮盘的折边上。 所述飞轮盘的壁厚为 2 ~ 5mm。 由于釆用了上述方案，本电启动飞轮的飞轮盘为由钢板拉深冲压成形有 凹月空和电启动从动齿的飞轮盘， 飞轮盘的壁厚为 2 ~ 5mm。 与现有的铸铁或 铝合金制作的飞轮相比较， 釆用钢板制作的飞轮盘的壁厚为 2 ~ 5mm, 使整 个飞轮的重量减轻， 旋转惯性减小， 制动时能在 3秒钟内完全停止转动， 能 适用于小型通用汽油机， 尤其是适用于草坪机这样的要求在短时间内完全制 动的小型机械上， 具有广泛的适用范围。 所述飞轮的电启动从动齿为冲压成 形的结构， 与飞轮盘为钢板一体制作而成， 避开了现有的铸铁和铝合金制作 的飞轮的电启动从动齿轮釆用过盈配合在飞轮盘上的缺陷， 即使较大的扭矩 也不能使从动齿轮与飞轮盘脱离， 飞轮传递扭矩的性能得到保证。 同时用钢 板拉深冲压成形有凹腔和电启动从动齿的飞轮盘， 其强度和耐磨性都优于铸 铁和铝合金制作的飞轮， 飞轮的使用寿命大大延长。 飞轮盘上的电启动从动 齿为冲压形成， 其加工工艺简单， 生产效率高， 原材料使用少， 有效降 ^^了 飞轮的制造成本。 并且， 飞轮盘轴心固接的轴心为锥孔的轴套釆用阶梯圓柱， 其小径端设有切面， 飞轮盘轴心设置的通孔为优弧半圓孔， 轴套的小径端插 入飞轮盘轴心设置的通孔中， 轴套的切面与通孔的弦边对应形成周向固定连 接后， 轴套与飞轮盘焊接固定。 使轴套与飞轮盘的连接更加牢固， 而且， 通 过轴套的切面与飞轮盘轴心优弧半圓孔的弦边形成周向定位， 能够满足大扭 矩的传递， 使扭矩的传递更加可靠。 同时， 在所述飞轮盘轴向端壁外侧偏于 轴心设有对人工启动装置的周向限位结构， 该周向限位结构能够在本电启动 飞轮需安装人工启动装置时， 对人工启动装置形成周向限位传递扭矩， 使本 电启动飞轮还可以安装上传递启动扭矩的人工启动装置， 用于人工启动的汽 油发动机， 增加了本飞轮的通用性。 下面结合附图和实施例对本发明作进一步说明。 附图说明 图 1为本发明的结构示意图； 图 2为图 1的 A-A向剖面结构图； 图 3为本发明安装上叶轮的示意图； 图 4为本发明用于人工启动的实施例图； 图 5为本发明中支架结构的另一实施例； 图 6为现有铸铁制作的电启动飞轮。 附图中， 1为飞轮盘， 2为夕卜磁 1 , 3为轴套， 4为内磁 1 , 5为从动齿， 6为压块， 7为凹腔， 8为保护套， 9为螺钉， 10为支架， 11为键槽， 12为 螺钉， 13为配重块， 14为折边， 15为弦边， 16为限位块， 17为人工启动装 置， 18为叶轮， 19为偏心销钉。 具体实施方式 参见图 1至图 3 , 本发明电启动飞轮的飞轮盘 1为由钢板拉深冲压成形 有凹腔 7和电启动从动齿 5的飞轮盘。 所述从动齿 5位于由飞轮盘 1的凹腔 7 口部向外折转延伸的环飞轮盘的折边 14上， 折边 14与飞轮盘 1为一体结 构， 垂直于飞轮盘 1轴线， 从动齿 5经冲压成形于该折边 14的圓周。 飞轮 盘 1的圓周面上设有一口， 飞轮盘 1的凹腔内设有用于固定外磁钢的支架 10 与该口对应。 该支架 10弯曲成凹槽固定连接在飞轮盘 1 的圓周内壁上， 通 过焊接或铆接在飞轮盘 1的圓周内壁均能达到相同效果。 一个外磁钢设于支 架 10的凹槽中对应飞轮盘 1的圓周面上的口， 用压板 6压住， 一个螺钉 12 穿过压板 6和外磁钢 2与支架 10紧固连接， 将外磁钢 2固定在支架 10上。 压板 6为与飞轮盘 1 圓周弧形相同弧形状， 安装在飞轮盘 1的圓周面上的口 中， 保证飞轮盘 1 圓周曲面的一致性。 外磁钢 2所对的飞轮盘 1的圓周内壁 通过螺钉 9紧固连接一平衡配重块 13 , 配重块 13可以才艮据配重平衡的需要 釆用不同重量的配重块。 两个内磁钢 4呈对称安装在飞轮盘 1的圓周内壁， 分别用螺钉固定在飞轮盘上， 与外磁钢 2的安装位置分别呈 90度设置。 所 述飞轮盘 1轴心固定连接一轴心为锥孔的轴套 3。 所述轴套 3为阶梯圓柱， 其小径端插入飞轮盘 1轴心设置的通孔中与飞轮盘周向固定连接。 飞轮盘 1 轴心设置的通孔为可周向定位的通孔， 本实施例的通孔为优弧半圓孔， 其弦 边 15为周向定位边， 所述轴套 1 的小径端设有切面， 轴套 3的小径端插入 飞轮盘 1轴心设置的通孔中， 轴套 3的切面与通孔的弦边 15对应形成周向 固定连接后， 轴肩与飞轮盘 1端壁紧贴并焊接固定。 釆用这种周向定位的嵌 接方式， 能够使结合部承受大的扭矩， 保证扭矩传递的稳定性， 同时也能保 证焊接时轴套 3和飞轮盘 1不会产生相对位移， 方便焊接。 轴套 3可位于飞 轮盘 1的凹腔 7内与飞轮盘 1焊接固定， 或者轴套 3也可以位于飞轮盘 1轴 向端壁外与飞轮盘 1焊接固定。 飞轮盘 1轴向端壁外通过四个均布的螺栓周 向固定一叶轮 18。所述飞轮盘 1轴向端壁外侧偏于轴心设有对人工启动装置 17的周向限位结构。该对人工启动装置的周向限位结构为飞轮盘 1轴向端壁 上冲压形成的限位块 16 , 该限位块 16与飞轮盘 1 为一体结构， 由飞轮盘 1 轴向端壁向外折转凸出， 形成可传递扭矩的限位块 16 , 该限位块 16位于飞 轮盘 1 的轴心通孔附近； 或者对人工启动装置 17 的周向限位结构也可以设 置为限位孔。 参见图 4 , 当人工启动装置 17与叶轮 18、 飞轮盘 1一起安装 在曲轴上时， 人工启动装置 17轴端面设置的偏心销钉 19或凸起能够与限位 块 16接触， 或插入限位孔中， 形成周向限位， 且传递扭矩。 所述限位块 16 由位于飞轮盘 1 轴向端壁轴心设有的优弧半圓通孔的弦边 15上缺口边冲压 折转形成， 能够保证承受扭矩的强度。 轴套 3的锥孔壁上设有与曲轴连接时 周向固定的键槽 11 , 装配在曲轴上时， 通过键与曲轴形成周向固定连接。 所 述飞轮盘的壁厚为 2 - 5mm, 其在此范围内的厚度根据发动机的大小确定， 以能够满足各种型号的小型汽油发动机的飞轮完成启动点火和惯性复位， 并 能在 3秒钟内完全制动停止。 参见图 5 , 本发明不仅仅局限于上述实施例， 所述用于固定外磁钢 2的 支架 10弯曲成槽， 与飞轮盘 1 圓周面的口一体冲压成形， 使支架 10与飞轮 盘 1为一个整体结构， 可减少装配工作量。 支架 10的凹槽中在装配外磁钢 2 后， 还可以设置保护套 8对外磁钢 2进行保护， 该保护套 8和外磁钢 2一道 被压块 6压在支架的凹槽中。 本发明不仅仅局限于上述实施例，所述飞轮盘 1轴向端壁轴心设置的对 轴套周向定位的通孔， 也可以为花键孔、 方形孔等， 轴套 3的小径端也相应 设置为与其配合的外花键、 方头等， 也同样能够实现轴套与飞轮盘的周向定 位连接， 传递较大扭矩。 本发明飞轮通常安装在电启动的汽油发动机的曲轴上，通过飞轮盘上的 从动齿与发动机启动电机轴上的齿轮啮合， 使启动电机的动力能够传递给飞 轮盘， 飞轮盘带动曲轴转动启动发动机， 实现汽油发动机的电启动。 参见图 4 , 如果需将本飞轮使用在人工启动的汽油发动机上， 只需 轴端面设有偏 心销钉或凸起的人工启动装置对着飞轮盘轴向端面， 飞轮、 叶轮和人工启动 装置依次安装在曲轴上用螺母压装紧， 人工启动装置的偏心销钉或凸起与飞 轮盘轴端面的限位块接触， 或者插入飞轮盘轴端面的限位孔中， 形成周向限 位， 且传递扭矩。 只要通过人工启动拉索带动人工启动装置转动， 就能够带 动飞轮盘转动， 飞轮盘带动曲轴转动启动发动机， 实现汽油发动机的人工启 动。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter flywheel of an engine, and more particularly to an electric start flywheel of a gasoline engine. BACKGROUND OF THE INVENTION A starter flywheel of a gasoline engine is typically mounted at one end of the crankshaft and has the function of initiating engine ignition and inertia reset. The outer circumference of the flywheel disc of the existing electric starting flywheel needs to cooperate with a driven gear, and the driven gear meshes with the gear on the shaft of the starting motor, and the power of the starting motor drives the flywheel to rotate, thereby driving the crankshaft to start. engine. Referring to Fig. 6, the flywheel disk 20 of the electric starter flywheel of the conventional gasoline engine is generally cast iron. The wall thickness of the flywheel disk must be 10 mm or more to ensure its strength and rigidity, so that it can form with the driven gear 21. A firm interference fit that does not distract from the torque when transmitting power. However, the flywheel made of this cast iron requires strength and rigidity, resulting in heavy weight, large rotational inertia, long braking time, and can not be completely stopped within 3 seconds, so it cannot be used for machinery such as a lawnmower. The braking of the small engine must be stopped within 3 seconds, and the flywheel disc of this cast iron structure also has the disadvantages of large machining allowance, poor heat dissipation, low production efficiency, and pollution of the environment, and its weak strength is easy. Cracking, scrapping the flywheel. In order to reduce the weight of the flywheel disc and reduce its inertia, some flywheel discs are made of aluminum alloy casting, but the flywheel made of aluminum alloy has low strength, and its key parts are easy to wear, and there is a problem that the service life is not long, especially the aluminum alloy. The high cost of materials increases the burden on businesses or users. SUMMARY OF THE INVENTION The object of the present invention is to provide an electric start flywheel for a gasoline engine, which has a flywheel disk formed by drawing a concave cavity and an electric starting driven tooth by deep drawing of a steel plate, in view of the deficiencies of the prior art. The weight of the flywheel is reduced, the inertia of the flywheel can be reduced, the rotation can be completely stopped within 3 seconds when the brake is realized, and the stable reliability of the torque transmitted by the driven teeth can be ensured, and the service life of the flywheel is prolonged. The object of the present invention is achieved as follows: The starting flywheel comprises a flywheel disc, an inner and outer magnet steel fixed on the flywheel disc, and a balance weight block, wherein the flywheel disc is formed by drawing and forming a concave moon and electric a flywheel disc that activates the driven tooth, the driven tooth being located at a ring extending outward from the mouth of the concave portion of the flywheel disc On the folded edge of the flywheel. The flywheel disk has a wall thickness of 2 to 5 mm. Since the above scheme is adopted, the flywheel disk of the electric starting flywheel is a flywheel disk formed by drawing and forming a concave moon and an electric starting driven tooth by a steel plate, and the flywheel disk has a wall thickness of 2 to 5 mm. Compared with the existing cast iron or aluminum alloy flywheel, the flywheel disc made of steel plate has a wall thickness of 2 ~ 5mm, which reduces the weight of the entire flywheel, reduces the rotational inertia, and can brake within 3 seconds. It can be used for small general-purpose gasoline engines, especially for small machines that require full braking in a short period of time. It has a wide range of applications. The electric starting driven tooth of the flywheel is a stamped and formed structure, and is formed integrally with the flywheel plate as a steel plate, avoiding the interference of the electric starting driven gear of the existing cast iron and aluminum alloy flywheel. Defects on the flywheel disc, even if the large torque does not detach the driven gear from the flywheel, the performance of the flywheel transmitting torque is guaranteed. At the same time, the flywheel disc with concave cavity and electric starting driven tooth is formed by drawing deep drawing with steel plate, and its strength and wear resistance are superior to those of cast iron and aluminum alloy. The service life of the flywheel is greatly extended. The electric starting driven teeth on the flywheel disk are formed by stamping, and the processing technology is simple, the production efficiency is high, the use of raw materials is small, and the manufacturing cost of the flywheel is effectively reduced. Moreover, the shaft center of the flywheel shaft is a stepped cylinder with a tapered hole, and a small-diameter end is provided with a cutting surface. The through hole of the flywheel shaft is a semi-circular hole, and the small diameter end of the sleeve is inserted into the flywheel. In the through hole provided by the disk shaft center, after the cutting surface of the bushing is formed in a circumferentially fixed connection with the chord side of the through hole, the bushing is welded and fixed to the flywheel disk. The connection between the sleeve and the flywheel is made stronger, and the circumferential direction of the chord of the arc-shaped semi-circular hole of the flywheel shaft is formed by the cutting plane of the sleeve, which can meet the transmission of large torque and make the torque transmission more reliable. At the same time, a circumferential limiting structure for the manual starting device is arranged on the outer side of the axial end wall of the flywheel disc, and the circumferential limiting structure can be artificial when the artificial starting device of the flywheel needs to be installed. The starting device forms a circumferential limit transmission torque, so that the electric starting flywheel can also be equipped with a manual starting device for transmitting the starting torque for the manually activated gasoline engine, which increases the versatility of the flywheel. The invention will now be further described with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural view of the present invention; FIG. 2 is a cross-sectional structural view taken along line AA of FIG. 1; 4 is a view showing an embodiment of the present invention for manual starting; FIG. 5 is another embodiment of the structure of the bracket of the present invention; and FIG. 6 is an electric starting flywheel manufactured by the prior art cast iron. In the drawing, 1 is a flywheel disk, 2 is a magnetic disk 1, 3 is a bushing, 4 is an inner magnet 1, 5 is a driven tooth, 6 is a pressing block, 7 is a concave cavity, 8 is a protective sleeve, 9 is Screw, 10 is the bracket, 11 is the keyway, 12 is the screw, 13 is the weight, 14 is the flange, 15 is the chord, 16 is the limit block, 17 is the manual start device, 18 is the impeller, 19 is the eccentric pin . 1 to 3, a flywheel disk 1 of an electric starter flywheel of the present invention is a flywheel disk formed by drawing a concave cavity 7 and an electric starting driven tooth 5 by a steel plate. The driven tooth 5 is located on the flange 14 of the flywheel disk which is folded outwardly from the mouth of the cavity 7 of the flywheel disk 1. The flange 14 is integral with the flywheel disk 1 and perpendicular to the axis of the flywheel disk 1 The driven teeth 5 are press-formed on the circumference of the flange 14. A groove is provided on the circumferential surface of the flywheel disk 1, and a bracket 10 for fixing the outer magnet steel is provided in the cavity of the flywheel disk 1 corresponding to the port. The bracket 10 is bent into a groove and fixedly attached to the inner wall of the circumference of the flywheel disc 1, and the same effect can be achieved by welding or riveting on the inner wall of the circumference of the flywheel disc 1. An outer magnetic steel is disposed in the groove of the bracket 10 corresponding to the opening on the circumferential surface of the flywheel disc 1, and is pressed by the pressing plate 6, and a screw 12 is fastened through the pressing plate 6 and the outer magnetic steel 2 to the bracket 10, and the outer portion is externally connected. The magnet 2 is fixed to the bracket 10. The pressure plate 6 has the same arc shape as the circumferential arc of the flywheel disc 1 and is installed in the mouth on the circumferential surface of the flywheel disc 1 to ensure the uniformity of the circumferential curved surface of the flywheel disc 1. The circumferential inner wall of the flywheel disk 1 to which the outer magnet 2 is attached is fastened to a balance weight 13 by screws 9, and the weight 13 can be used with different weights according to the weight balance. The two inner magnetic steels 4 are symmetrically mounted on the inner circumferential wall of the flywheel disc 1 and are respectively fixed to the flywheel disc by screws, and are disposed at 90 degrees with the mounting position of the outer magnet steel 2, respectively. The flywheel disc 1 is axially fixedly connected to a sleeve 3 whose axis is a tapered hole. The sleeve 3 is a stepped cylinder, and the small diameter end thereof is inserted into the through hole provided in the axial center of the flywheel disc 1 and is fixedly connected to the flywheel in the circumferential direction. The through hole provided in the axial center of the flywheel 1 is a through hole which can be circumferentially positioned. The through hole in this embodiment is a superior arc semicircular hole, and the chord 15 is a circumferential positioning edge, and the small diameter end of the sleeve 1 is provided. In the cut surface, the small diameter end of the sleeve 3 is inserted into the through hole provided in the axial center of the flywheel disc 1. After the cut surface of the sleeve 3 is formed into a circumferential fixed connection with the chord side 15 of the through hole, the shoulder is closely attached to the end wall of the flywheel 1 And welded and fixed. With this circumferentially positioned engagement method, the joint can be subjected to a large torque to ensure the stability of the torque transmission, and at the same time, the sleeve 3 and the flywheel 1 can be prevented from being relatively displaced during welding, and the welding is facilitated. The sleeve 3 can be located in the cavity 7 of the flywheel 1 and welded to the flywheel 1 or the sleeve 3 can also be located on the flywheel 1 axis. The flywheel disc 1 is welded and fixed to the outside of the end wall. An impeller 18 is circumferentially fixed by four uniformly distributed bolts outside the axial end wall of the flywheel disc 1. The outer side of the axial end wall of the flywheel disc 1 is provided with a circumferential limiting structure for the manual starting device 17 offset from the axial center. The circumferential limiting structure of the pair of manual starting devices is a limiting block 16 formed by punching on the axial end wall of the flywheel disc 1. The limiting block 16 and the flywheel disc 1 are integrated, and the axial end wall of the flywheel disc 1 is The outer fold is convex, forming a limitable block 16 for transmitting torque, the limit block 16 is located near the axial through hole of the flywheel 1; or the circumferential limit structure of the manual starting device 17 can also be set as a limit hole. Referring to FIG. 4, when the manual starting device 17 is mounted on the crankshaft together with the impeller 18 and the flywheel 1, the eccentric pin 19 or the protrusion provided on the axial end surface of the manual starting device 17 can be in contact with the limiting block 16, or inserted into the limiting hole. Medium, forming a circumferential limit and transmitting torque. The limiting block 16 is formed by punching and folding the notched side of the chord edge 15 of the superior arc semi-circular through hole provided at the axial end wall of the flywheel disc 1 to ensure the strength of the torque. The tapered hole wall of the sleeve 3 is provided with a key groove 11 which is circumferentially fixed when connected to the crankshaft, and is assembled to the crankshaft to form a circumferentially fixed connection with the crankshaft. The flywheel disc has a wall thickness of 2 - 5 mm, and the thickness within the range is determined according to the size of the engine, so as to satisfy the start of the ignition and inertia reset of the flywheel of various types of small gasoline engines, and can be in 3 seconds. The internal brake stops. Referring to Fig. 5, the present invention is not limited to the above embodiment, and the bracket 10 for fixing the outer magnet 2 is bent into a groove and integrally formed with the port on the circumferential surface of the flywheel 1 so that the bracket 10 and the flywheel 1 are A monolithic structure that reduces assembly effort. After the outer magnet 2 is assembled in the groove of the bracket 10, a protective sleeve 8 may be provided to protect the outer magnetic steel 2, and the protective sleeve 8 and the outer magnetic steel 2 are pressed together by the pressing block 6 in the groove of the bracket. The present invention is not limited to the above embodiment, and the through hole for circumferentially positioning the sleeve provided by the axial end wall of the flywheel disc 1 may also be a spline hole, a square hole, or the like, and the small diameter end of the sleeve 3 Corresponding to the external splines, square heads, etc., which are matched with them, the circumferential positioning connection between the sleeve and the flywheel can also be achieved, and a large torque is transmitted. The flywheel of the invention is usually mounted on the crankshaft of the electrically activated gasoline engine, and the driven teeth on the flywheel disk mesh with the gears on the engine starter motor shaft, so that the power of the starter motor can be transmitted to the flywheel disk, and the flywheel disk drives the crankshaft to start. The engine, which realizes the electric start of the gasoline engine. Referring to Figure 4, if the flywheel needs to be used on a manually activated gasoline engine, only the eccentric pin or the raised manual starting device on the end face of the shaft is required to face the axial end face of the flywheel, and the flywheel, impeller and manual starting device are installed in sequence. Pressing on the crankshaft with a nut, the eccentric pin or protrusion of the manual starting device is in contact with the limit block of the end face of the flywheel disc, or inserted into the limit hole of the end face of the flywheel shaft to form a circumferential limit, and the torque is transmitted. . As long as the manual starting device is rotated by the manual starting cable, the flywheel can be rotated, and the flywheel drives the crankshaft to start the engine, thereby realizing the manual starting of the gasoline engine.

Claims

权 利 要 求 书 Claim
1. 一种汽油发动机的电启动飞轮， 包括飞轮盘、 固定在飞轮盘上的内、 外磁钢和平衡配重块， 其特征在于： 所述飞轮盘为由钢板拉深冲压成 形有凹空和电启动从动齿的飞轮盘， 所述从动齿位于由飞轮盘凹月空口 部向外折转延伸的环飞轮盘的折边上， 折边与飞轮盘为一体结构。 1. An electric start flywheel of a gasoline engine, comprising a flywheel disc, an inner and outer magnet steel fixed on the flywheel disc, and a balance weight, wherein: the flywheel disc is formed by drawing deep-drawn by a steel plate And a flywheel disk that electrically activates the driven tooth, the driven tooth is located on a folded edge of the ring flywheel disk that is folded outwardly from the concave portion of the flywheel disk, and the folded edge and the flywheel disk are integrated.
2. 根据权利要求 1所述的汽油发动机的电启动飞轮， 其特征在于： 所述 环飞轮盘的折边垂直于飞轮盘轴线， 从动齿经冲压成形于该折边的圓 周。 2. The electric starter flywheel of a gasoline engine according to claim 1, wherein: the flange of the flywheel disk is perpendicular to the axis of the flywheel, and the driven teeth are stamped and formed on the circumference of the flange.
3. 根据权利要求 1或 2所述的汽油发动机的电启动飞轮， 其特征在于： 所述飞轮盘轴心固定连接一轴心为锥孔的轴套。 3. The electric starting flywheel of a gasoline engine according to claim 1 or 2, wherein: the flywheel disk shaft is fixedly coupled to a bushing having a shaft center.
4. 根据权利要求 3所述的汽油发动机的电启动飞轮， 其特征在于： 所述 轴套为阶梯圓柱， 其小径端插入飞轮盘轴心设置的通孔中与飞轮盘周 向固定连接。 4. The electric starter flywheel of a gasoline engine according to claim 3, wherein: the sleeve is a stepped cylinder, and the small-diameter end is inserted into the through hole provided in the axis of the flywheel and fixedly connected to the flywheel in the circumferential direction.
5. 根据权利要求 4所述的汽油发动机的电启动飞轮， 其特征在于： 所述 轴套的小径端设有切面， 飞轮盘轴心设置的通孔为优弧半圓孔， 轴套 的小径端插入飞轮盘轴心设置的通孔中， 轴套的切面与通孔的弦边对 应形成周向固定连接后， 轴套与飞轮盘悍接固定。 5. The electric starter flywheel of a gasoline engine according to claim 4, wherein: the small diameter end of the sleeve is provided with a cutting surface, and the through hole provided by the axis of the flywheel is a semi-circular hole of the arc, and the small diameter end of the sleeve Inserted into the through hole provided by the axis of the flywheel disc, the bushing is fixedly connected with the chord of the through hole to form a circumferential fixed connection, and the sleeve is fastened to the flywheel.
6. 根据权利要求 1或 2所述的汽油发动机的电启动飞轮， 其特征在于： 所述飞轮盘轴向端壁外侧偏于轴心设有对人工启动装置的周向限位结 构。 The electric starting flywheel of a gasoline engine according to claim 1 or 2, wherein: the outer side of the axial end wall of the flywheel is biased to the axial center to provide a circumferential limiting structure for the manual starting device.
7. 根据权利要求 6所述的汽油发动机的电启动飞轮， 其特征在于： 所述 对人工启动装置的周向限位结构为飞轮盘轴向端壁上冲压形成的限位 块， 该限位块与飞轮盘为一体结构， 由飞轮盘轴向端壁向外折转凸出。 The electric starting flywheel of a gasoline engine according to claim 6, wherein: the circumferential limiting structure of the manual starting device is a limiting block formed by punching on an axial end wall of the flywheel, the limit The block and the flywheel are integrated and protruded outward from the axial end wall of the flywheel.
8. 根据权利要求 1所述的汽油发动机的电启动飞轮， 其特征在于： 所述 飞轮盘的圓周面上设有一口， 飞轮盘的凹腔内设有用于固定外磁钢的 支架与该口对应， 外磁钢用压板和螺钉固定在支架上。 8. The electric starter flywheel of a gasoline engine according to claim 1, wherein: a surface of the flywheel disk is provided on a circumference of the flywheel, and a cavity for fixing the outer magnet is provided in the cavity of the flywheel disk. Correspondingly, the outer magnetic steel is fixed on the bracket by a pressure plate and a screw.
9. #居权利要求 7所述的汽油发动机的电启动飞轮， 其特征在于： 所述 用于固定外磁钢的支架弯曲成槽固定连接在飞轮盘的圓周内壁上， 或 者用于固定外磁钢的支架与飞轮盘圓周面的口一体冲压成形。 9. The electric starter flywheel of the gasoline engine according to claim 7, wherein: the bracket for fixing the outer magnet is bent into a groove fixedly connected to the inner circumferential wall of the flywheel, or used for fixing the outer magnet. The bracket of the steel is integrally formed with the mouth of the circumferential surface of the flywheel.
10. 根据权利要求 1 所述的汽油发动机的电启动飞轮， 其特征在于： 所述 飞轮盘的壁厚为 2 ~ 5mm。 10. The electric start flywheel of a gasoline engine according to claim 1, wherein: the flywheel disk has a wall thickness of 2 to 5 mm.
PCT/CN2008/072144 2007-11-23 2008-08-26 An electric starting flywheel for gasoline engine WO2009065315A1 (en)

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CN2007100930316A CN101169092B (en) 2007-11-23 2007-11-23 Gasoline engine electric-starting flywheel
CN200710093031.6 2007-11-23

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US20140260781A1 (en) * 2013-03-15 2014-09-18 General Electric Company Torsional mode shifting
CN109353526A (en) * 2018-11-29 2019-02-19 吉林大学 A kind of extended-range energy transfer mechanism for light-weight electric aircraft
CN111855079A (en) * 2020-06-22 2020-10-30 芜湖东光大华机械制造有限公司 Flexible flywheel dynamic balance detection and processing equipment

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CN101169092B (en) * 2007-11-23 2010-09-08 隆鑫工业有限公司 Gasoline engine electric-starting flywheel
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CN201125821Y (en) * 2007-11-29 2008-10-01 隆鑫工业有限公司 Dual-purpose start-up fly wheel of carburettor
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CN109353526A (en) * 2018-11-29 2019-02-19 吉林大学 A kind of extended-range energy transfer mechanism for light-weight electric aircraft
CN109353526B (en) * 2018-11-29 2024-05-14 吉林大学 Range-extending energy conversion mechanism for light electric aircraft
CN111855079A (en) * 2020-06-22 2020-10-30 芜湖东光大华机械制造有限公司 Flexible flywheel dynamic balance detection and processing equipment

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