WO2015109627A1 - 一种内燃机启动装置 - Google Patents

一种内燃机启动装置 Download PDF

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Publication number
WO2015109627A1
WO2015109627A1 PCT/CN2014/072354 CN2014072354W WO2015109627A1 WO 2015109627 A1 WO2015109627 A1 WO 2015109627A1 CN 2014072354 W CN2014072354 W CN 2014072354W WO 2015109627 A1 WO2015109627 A1 WO 2015109627A1
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WO
WIPO (PCT)
Prior art keywords
wheel
sheave
internal combustion
combustion engine
pawl
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PCT/CN2014/072354
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English (en)
French (fr)
Inventor
覃继明
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台州市伊牧精密机械有限公司
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Publication of WO2015109627A1 publication Critical patent/WO2015109627A1/zh

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    • 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
    • F02N3/00—Other muscle-operated starting apparatus
    • F02N3/02—Other muscle-operated starting apparatus having pull-cords
    • 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
    • F02N15/022—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch
    • F02N15/026—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch of the centrifugal type
    • 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
    • F02N15/022—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch
    • F02N15/027—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch of the pawl type
    • 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
    • F02N5/00—Starting apparatus having mechanical power storage
    • F02N5/02—Starting apparatus having mechanical power storage of spring type

Definitions

  • the present invention relates to an internal combustion engine structure, and more particularly to an internal combustion engine starting device.
  • the small internal combustion engine is widely used as a power source due to its strong power, compact structure, light weight, and easy carrying.
  • Most small internal combustion engines use a self-resetting and starting system with a simple structure.
  • the starter of the internal combustion engine drives the starter disc to rotate by manually pulling the rotary sheave.
  • the end face of the starter disc is on the end face of the internal combustion engine. Because the instantaneous explosive force is required to pull the sheave, the starter disc can be rotated quickly and instantaneously. This makes it easy for the end face of the starter disk to be damaged by instantaneous collision of the end face of the internal combustion engine, and the internal combustion engine is prone to generate a shock force to the reverse force of the drawstring during the quick start process, which may cause rebound damage to the human hand.
  • the existing internal combustion engine starting structure has a unidirectional driving structure which is complicated, and a limit column and a rotating column must be provided to realize the function of the one-way driving structure, and a protruding limit column and a turn are arranged on the upper surface of the sheave.
  • the column undoubtedly increases the complexity of the production process, and the limit column and the rotating column are very easy to be damaged during operation, so that the sheave is scrapped; the pawl often derails during the swinging motion, and the starter needs to be disassembled and reinstalled. use.
  • the present invention provides an internal combustion engine starting device.
  • the technical problem to be solved by the present invention is to provide a buffer capable of being activated when the starting disk is instantaneously activated, and the one-way driving structure is relatively simple and has high stability.
  • An internal combustion engine starting device that is not easily damaged. It can eliminate the additional impact force of the internal force of the internal combustion engine on the pulling rope during the starting process, thus avoiding the rebound damage caused to the human hand.
  • an internal combustion engine starting device comprising: a chassis, a sheave, an intermediate wheel above the sheave, and a starting wheel above the intermediate wheel;
  • the chassis is provided with an intermediate shaft,
  • the sheave, the intermediate wheel and the starting wheel are sequentially sleeved on the intermediate shaft, the bottom of the sheave is provided with a reset coil spring, and a unidirectional driving structure is arranged between the sheave and the intermediate wheel, and the intermediate wheel is A unidirectional structure is disposed between the intermediate shafts, and a buffer structure is disposed between the intermediate wheels and the starting wheels.
  • the one-way structure is a first one-way bearing.
  • the buffer structure is a helical torsion spring
  • the spiral torsion spring is vertically disposed, and the upper end thereof is axially extended upward and inserted into the hole in the starting wheel, and the lower end thereof is axially extended downward and inserted into the intermediate wheel. Inside the hole.
  • the one-way driving structure comprises a second one-way bearing fixed coaxially on the sheave and a downwardly extending cylindrical structure disposed on the lower end surface of the intermediate wheel, the second one-way bearing sleeve Connected to the cylindrical structure.
  • the one-way driving structure includes a pawl mounting seat disposed on the upper end surface of the sheave and coaxially fixed with the sheave, and the pawl mounting seat is provided with at least one pawl in the circumferential direction;
  • the lower end surface of the intermediate wheel is provided with a recessed structure, and the inner peripheral surface of the recessed structure is provided with a plurality of ratchets uniformly distributed in the circumferential direction; the pawl is coupled to the ratchet by the action of the torsion spring.
  • the pawl mount is provided with a mounting groove for mounting the pawl, the inside of the mounting groove has a circular arc shape, and a blocking surface is disposed at an end located outside the mounting groove; the pawl is disposed There is a circular arc end that cooperates with the mounting groove.
  • the two pawls are symmetrically disposed in the circumferential direction of the pawl mount.
  • the two pawls are symmetrically disposed in the mounting groove on the pawl mount.
  • the internal combustion engine starting device of the invention can effectively buffer the starting disk during starting, and prevent the rapid impact damage of the starting disk; at the same time, the one-way structure can eliminate the additional impact force of the internal force of the internal combustion engine on the pulling rope during the starting process, Thereby avoiding the rebound damage caused to the human hand.
  • Figure 1 is a schematic view of the structure of the present invention.
  • Figure 2 is a top exploded view of Embodiment 1 of the present invention.
  • Figure 3 is a bottom view exploded view of Embodiment 1 of the present invention.
  • FIG. 4 is a schematic perspective view showing the upper end surface of the sheave of the embodiment 1 of the present invention.
  • Fig. 5 is a top plan view showing the upper end surface of the sheave of the first embodiment of the present invention.
  • Fig. 6 is a perspective view showing the structure of the lower end surface of the intermediate wheel according to Embodiment 1 of the present invention.
  • Fig. 7 is a bottom plan view showing the lower end surface of the intermediate wheel according to Embodiment 1 of the present invention.
  • Figure 8 is a bottom view exploded view of Embodiment 2 of the present invention.
  • Figure 9 is a schematic exploded view of a sheave and an intermediate wheel according to Embodiment 2 of the present invention.
  • Figure 10 is a cross-sectional structural view showing a second embodiment of the present invention.
  • the present invention is an internal combustion engine starting device comprising a chassis 9, a sheave 1, an intermediate wheel 2 located above the sheave 1, and a starting wheel 3 located above the intermediate wheel 2;
  • the shaft 4, the sheave 1, the intermediate wheel 2, and the starting wheel 3 are sequentially sleeved on the intermediate shaft 4, and at the bottom of the sheave 1 is provided a reset coil spring 11 (see Fig.
  • the one-way structure is shown as a first one-way bearing 5; a buffer structure is disposed between the intermediate wheel 2 and the starter wheel 3, and the buffer structure is a helical torsion spring 6 as shown in FIG.
  • the spiral torsion spring 6 is vertically disposed, the upper end of which protrudes axially upward and is inserted into the hole 30 in the starter disc 3, and the lower end thereof extends axially downward and is inserted into the hole in the intermediate wheel 2 (not shown in the drawing) )Inside.
  • the one-way driving structure between the sheave 1 and the intermediate wheel 2 includes a pawl mount 71 located at the upper end surface of the sheave 1 and coaxially fixed to the sheave 1, the pawl mounting At least one pawl 72 is disposed on the seat 71 in the circumferential direction; and a recessed structure 73 is disposed on the lower end surface of the intermediate wheel 2, and the inner peripheral surface of the recessed structure 73 is provided with a plurality of ratchets 74 uniformly distributed in the circumferential direction.
  • the pawl 72 has its free end snapped onto the ratchet 74 by the action of the torsion spring 75.
  • the pawl mount 71 is provided with a mounting groove 711 for mounting the pawl 72.
  • the mounting groove 711 has a circular arc shape inside, and a blocking surface 712 is disposed at an end located outside the mounting groove 711; the pawl 72 A circular arc-shaped end portion 721 that cooperates with the mounting groove 711 is provided.
  • the pawls 72 are two and are symmetrically disposed in the circumferential direction of the pawl mount 71.
  • the pawl mount 71 can be integrally formed with the sheave 1 and the mounting groove 711 is directly opened on the pawl mount 71, and the blocking surface 712 is provided at the end outside the mounting groove 711, both production and assembly are very
  • the utility model has the advantages of convenient and simple structure, and the pawl 72 is extended and retracted by the torsion spring 75 and the ratchet teeth 74, and the operation is stable, and the derailment phenomenon does not occur.
  • the pulling sheave 1 is rotated in the forward direction, and the return coil spring 11 at the bottom of the sheave 1 is simultaneously stretched to accumulate the elastic potential energy.
  • the pawl 72 is in the extended state, and the pawl 72 is embedded in the ratchet 74 of the intermediate wheel 2.
  • the intermediate wheel 2 is rotated in the same direction as the sheave 1 , and the rotation of the intermediate wheel 2 is transmitted to the starter wheel 3 through the helical torsion spring 6, so that the starter wheel 3 also rotates in the same direction, thereby starting the internal combustion engine;
  • the explosive force when the end face of the starting disk 3 is in contact with the driving end face of the internal combustion engine, the speed and the impact force are very large.
  • the starting disk 3 can be provided with a rotary buffer so as not to be damaged by a hard impact;
  • the helical torsion spring 6 also transmits the rotation downward to the intermediate wheel 2, but since the first one-way bearing 5 is provided between the intermediate wheel 2 and the intermediate shaft 4, the first one-way bearing 5 can only allow the intermediate wheel 2 to be unidirectional Rotating, so the intermediate wheel 2 does not reverse rotation, thus blocking the transmission back to the steering sheave 1; when the internal combustion engine is started, the rope in the sheave 1 needs to be returned, and the return coil spring provided at the bottom of the sheave 1 11 contraction recovery, driven Reversing wheel, the return cord, the pawl 72 is in a contracted state, exits from the ratchet teeth 74 in the intermediate wheel 2, thereby driving the intermediate wheel 2 is not reversed.
  • the one-way driving structure between the sheave 1 and the intermediate wheel 2 may be another structure including a second one-way bearing 8 fixed to the sheave 1 and the intermediate wheel.
  • a downwardly extending cylindrical structure 81 is disposed on the lower end surface, and the second one-way bearing 8 is sleeved outside the cylindrical structure 81.
  • the pulling sheave 1 rotates in the forward direction. Due to the action of the second one-way bearing 8, the cylindrical structure 81 and the second one-way bearing 8 are engaged with each other, thereby driving the intermediate wheel 2 to rotate; when the pulling of the sheave is stopped At 1 o'clock, the return coil spring 11 drives the sheave 1 to rotate in the reverse direction, and the second one-way bearing 8 rotates in the opposite direction at the same time. At this time, the second one-way bearing 8 is disengaged from the cylindrical structure 81, so the intermediate wheel 2 is not reversed.
  • the intermediate wheel 2 can not be reversely rotated, and the second one-way bearing 8 and the cylindrical structure 81 are relatively rotated, thereby realizing the sheave 1 to the intermediate wheel 2 One-way drive.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pulleys (AREA)

Abstract

一种内燃机启动装置，包括底盘（9）、绳轮（1）、位于绳轮（1）上方的中间轮（2）以及位于中间轮（2）上方的启动轮（3）；底盘（9）上设有中间轴（4），绳轮（1）、中间轮（2）、启动轮（3）依次套接在中间轴（4）上，绳轮（1）底部设置有复位卷簧（11），绳轮（1）与中间轮（2）之间设有单向驱动结构，中间轮（2）与中间轴（4）之间设有单向结构，中间轮（2）与启动轮（3）之间设置有缓冲结构。该内燃机启动装置能够有效在启动时对启动装置进行缓冲，防止启动装置的快速撞击毁损；同时，单向结构能够避免在复位卷簧拉动绳轮复位时内燃机反向力作用的附加冲击；并且结构及生产、组装工艺简单，运行稳定。

Description

一种内燃机启动装置 技术领域
本发明涉及一种内燃机结构，尤其涉及一种内燃机启动装置。
背景技术
小型内燃机由于其动力强劲、结构紧凑、重量轻、携带方便等优点而作为动力源广泛使用。小型内燃机大多采用结构简单的手拉自复位启动系统。内燃机启动器，在启动时，通过手动拉转绳轮带动启动盘转动，启动盘的端面顶在内燃机的传动端面上，由于需要瞬间巨大的爆发力来拉动绳轮，因此启动盘能够瞬间快速转动，这就容易使启动盘的端面因瞬间快速碰撞内燃机传动端面而毁损，而且内燃机在快速启动过程中容易产生对拉绳的反向力作用附加冲击力，会对人手造成的反弹伤害。
并且，现有的内燃机启动结构，其单向驱动结构较为复杂，必须要设置限位柱以及转柱才能实现单向驱动结构的功能，而在绳轮上表面设置凸起的限位柱以及转柱，无疑增加了生产工艺的复杂性，同时该限位柱和转柱在运行中非常容易损坏，从而使绳轮报废；棘爪在摆动运动中经常脱轨，需要将启动器拆开重新安装才能使用。
 技术问题
为了解决上述技术问题，本发明提供了一种内燃机启动装置，本发明要解决的技术问题是：提供一种在启动盘瞬间启动时能够进行缓冲，并且单向驱动结构较为简单，稳定性高，不易毁损的内燃机启动装置。能够消除内燃机在启动过程中对拉绳的反向力作用附加冲击力，从而避免对人手造成的反弹伤害。
技术解决方案
为实现上述技术目的，本发明的技术方案为：一种内燃机启动装置，包括底盘、绳轮、位于绳轮上方的中间轮以及位于中间轮上方的启动轮；所述底盘上设有中间轴，所述绳轮、中间轮、启动轮依次套接在中间轴上，所述绳轮底部设置有复位卷簧，所述绳轮与中间轮之间设有单向驱动结构，所述中间轮与中间轴之间设有单向结构，所述中间轮与启动轮之间设置有缓冲结构。
上述方案中，所述单向结构为第一单向轴承。
上述方案中，所述缓冲结构为螺旋扭转弹簧，该螺旋扭转弹簧竖直设置，其上端轴向向上伸出并插入启动轮上的孔内，其下端轴向向下伸出并插入中间轮上的孔内。
上述方案中，所述单向驱动结构包括同轴配合固定在绳轮上的第二单向轴承和所述中间轮下端面设置的向下延伸的筒状结构，所述第二单向轴承套接所述筒状结构。
上述方案中，所述单向驱动结构包括位于绳轮上端面并且与绳轮同轴配合固定设置的棘爪安装座，所述棘爪安装座上沿周向设置有至少一个棘爪；以及所述中间轮下端面设置有凹进结构，该凹进结构的内周面上设有沿周向均布的若干棘齿；所述棘爪通过扭簧的作用使其自由端卡接在棘齿上。
上述方案中，所述棘爪安装座上设置有用于安装棘爪的安装槽，该安装槽内部呈圆弧形结构，在位于该安装槽外侧的端部设置有阻挡面；所述棘爪设置有与该安装槽相配合的圆弧形端部。
上述方案中，所述棘爪为两个，对称设置在棘爪安装座的周向上。
上述方案中，所述棘爪为两个，对称设置在棘爪安装座上的安装槽内。
 有益效果
本发明的内燃机启动装置，能够有效在启动时对启动盘进行缓冲，防止启动盘的快速撞击毁损；同时，单向结构能够消除内燃机在启动过程中对拉绳的反向力作用附加冲击力，从而避免对人手造成的反弹伤害。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明的结构示意图。
图2为本发明实施例1的俯视爆炸图。
图3为本发明实施例1的仰视爆炸图。
图4为本发明实施例1的绳轮上端面的立体结构示意图。
图5为本发明实施例1的绳轮上端面的俯视结构示意图。
图6为本发明实施例1的中间轮下端面的立体结构示意图。
图7为本发明实施例1的中间轮下端面的仰视结构示意图。
图8为本发明实施例2的仰视爆炸图。
图9为本发明实施例2绳轮和中间轮分解结构示意图。
图10为本发明实施例2的剖视结构示意图。
图中：1、绳轮；11、复位卷簧；2、中间轮；3、启动轮；30、螺旋扭转弹簧安装孔；4、中间轴；5、第一单向轴承；6、螺旋扭转弹簧；71、棘爪安装座；711、棘爪安装槽；712、阻挡面；72、棘爪；721、棘爪的圆弧形端部；73、凹进结构；74、棘齿；75、扭簧；8、第二单向轴承；81、筒状结构；9、底盘。
 本发明的最佳实施方式
本发明的实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。
如图1所示，本发明是一种内燃机启动装置，包括底盘9、绳轮1、位于绳轮1上方的中间轮2以及位于中间轮2上方的启动轮3；在底盘9上设有中间轴4，绳轮1、中间轮2、启动轮3依次套接在中间轴4上，在绳轮1的底部设置有复位卷簧11（见图2），该复位卷簧11在拉动绳轮正向旋转时积蓄势能，所积蓄的势能用于复位绳轮1旋转会初始状态；绳轮1与中间轮2之间设有单向驱动结构，中间轮2与中间轴4之间设有单向结构，所述单向结构如图2所示为第一单向轴承5；中间轮2与启动轮3之间设置有缓冲结构，所述缓冲结构如图2所示，为螺旋扭转弹簧6，该螺旋扭转弹簧6竖直设置，其上端轴向向上伸出并插入启动盘3上的孔30内，其下端轴向向下伸出并插入中间轮2上的孔（图中未示出）内。
实施例1：
如图2至7所示，绳轮1和中间轮2之间的单向驱动结构包括位于绳轮1上端面并且与绳轮1同轴线固定设置的棘爪安装座71，该棘爪安装座71上沿周向设置有至少一个棘爪72；和在所述中间轮2下端面设置有凹进结构73，该凹进结构73的内周面上设有沿周向均布的若干棘齿74；所述棘爪72通过扭簧75的作用使其自由端卡接在棘齿74上。
棘爪安装座71上设置有用于安装棘爪72的安装槽711，该安装槽711内部呈圆弧形结构，在位于该安装槽711外侧的端部设置有阻挡面712；所述棘爪72设置有与该安装槽711相配合的圆弧形端部721。
所述棘爪72为两个，对称设置在棘爪安装座71的周向上。
由于棘爪安装座71可以与绳轮1一体成型制造，并且棘爪安装座71上直接开设安装槽711，以及在安装槽711外侧的端部设置有阻挡面712，无论是生产还是组装都非常方便，并且结构简单，棘爪72在扭簧75以及棘齿74的作用下做伸出、收起的摆动运动，运行稳定，不会发生脱轨现象。
使用时，拉动绳轮1正向转动，绳轮1底部的复位卷簧11同时被拉伸，积蓄弹性势能，此时棘爪72处于伸出状态，棘爪72嵌入中间轮2的棘齿74中，带动中间轮2与绳轮1同向转动，中间轮2的转动通过螺旋扭转弹簧6传递到启动轮3，使启动轮3也作同向转动，从而启动内燃机；由于启动内燃机需要瞬间巨大的爆发力，启动盘3的端面与内燃机的传动端面接触时，速度和冲击力非常巨大，由于设有螺旋扭转弹簧6，能够为启动盘3提供回转缓冲，使其不至于发生硬性撞击而损坏；螺旋扭转弹簧6也将回转向下传递至中间轮2，但由于中间轮2与中间轴4之间设有第一单向轴承5，该第一单向轴承5只能允许中间轮2单向转动，因此中间轮2并不反向回转，因此就阻断了缓冲回转向绳轮1传递；当内燃机发动完成，绳轮1内的拉绳需回位，绳轮1底部设置的复位卷簧11收缩复原，带动绳轮1反转，拉绳回位，棘爪72处于收缩状态，从中间轮2的棘齿74中退出，因而并不带动中间轮2反转。
实施例2：
如图8~10所示，绳轮1和中间轮2之间的单向驱动结构还可以为另一种结构，包括固定在绳轮1上的第二单向轴承8和在所述中间轮2下端面设置的向下延伸的筒状结构81，该第二单向轴承8套接在所述筒状结构81外。
使用时，拉动绳轮1正向转动，由于第二单向轴承8的作用，使得筒状结构81与第二单向轴承8之间相互咬合，从而带动中间轮2转动；当停止拉动绳轮1时，复位卷簧11带动绳轮1反向转动，第二单向轴承8同时反向转动，此时第二单向轴承8与筒状结构81解除咬合，因此不带动中间轮2反向转动；而同时由于第一单向轴承5的作用，使得中间轮2也无法反向转动，第二单向轴承8与筒状结构81之间发生相对旋转，从而实现绳轮1对中间轮2的单向驱动。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
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Claims (8)

  1. 一种内燃机启动装置，其特征在于：包括底盘、绳轮、位于绳轮上方的中间轮以及位于中间轮上方的启动轮；所述底盘上设有中间轴，所述绳轮、中间轮、启动轮依次套接在中间轴上，所述绳轮底部设置有复位卷簧，所述绳轮与中间轮之间设有单向驱动结构，所述中间轮与中间轴之间设有单向结构，所述中间轮与启动轮之间设置有缓冲结构。
  2. 如权利要求1所述的内燃机启动装置，其特征在于：所述单向结构为第一单向轴承。
  3. 如权利要求1所述的内燃机启动装置，其特征在于：所述缓冲结构为螺旋扭转弹簧，该螺旋扭转弹簧竖直设置，其上端轴向向上伸出并插入启动轮上的孔内，其下端轴向向下伸出并插入中间轮上的孔内。
  4. 如权利要求1-3任一所述的内燃机启动装置，其特征在于：所述单向驱动结构包括同轴配合固定在绳轮上的第二单向轴承和所述中间轮下端面设置的向下延伸的筒状结构，所述第二单向轴承套接所述筒状结构。
  5. 如权利要求1-3任一所述的内燃机启动装置，其特征在于：所述单向驱动结构包括位于绳轮上端面并且与绳轮同轴配合固定设置的棘爪安装座，所述棘爪安装座上沿周向设置有至少一个棘爪；在所述中间轮下端面设置有凹进结构，该凹进结构的内周面上设有沿周向均布的若干棘齿；所述棘爪通过扭簧的作用使其自由端卡接在棘齿上。
  6. 如权利要求5所述的内燃机启动装置，其特征在于：所述棘爪安装座上设置有用于安装棘爪的安装槽，该安装槽内部呈圆弧形结构，在位于该安装槽外侧的端部设置有阻挡面；所述棘爪设置有与该安装槽相配合的圆弧形端部。
  7. 如权利要求5所述的内燃机启动装置，其特征在于：所述棘爪为两个，对称设置在棘爪安装座的周向上。
  8. 如权利要求6所述的内燃机启动装置，其特征在于：所述棘爪为两个，对称设置在棘爪安装座上的安装槽内。
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