WO2013029292A1 - 割草机刹车结构 - Google Patents

割草机刹车结构 Download PDF

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Publication number
WO2013029292A1
WO2013029292A1 PCT/CN2011/080724 CN2011080724W WO2013029292A1 WO 2013029292 A1 WO2013029292 A1 WO 2013029292A1 CN 2011080724 W CN2011080724 W CN 2011080724W WO 2013029292 A1 WO2013029292 A1 WO 2013029292A1
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Prior art keywords
pulley
belt pulley
friction
liner
lining
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PCT/CN2011/080724
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English (en)
French (fr)
Inventor
张文兵
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嘉兴亚特园林机械研究所
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Publication of WO2013029292A1 publication Critical patent/WO2013029292A1/zh

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D69/00Driving mechanisms or parts thereof for harvesters or mowers
    • A01D69/10Brakes

Definitions

  • the invention relates to a lawn mower brake device.
  • a lawn mower is a commonly used garden tool that is suitable for trimming grass.
  • the mechanical brake structure of the existing lawn mower has the disadvantages of unstable instability and large fluctuations in braking time.
  • the technical problem to be solved by the present invention is to provide a lawn mower brake structure which is simple in structure, low in cost, and reliable in braking.
  • the lawn mower brake structure includes a base, a motor is fixed on the base and is rotationally connected to an output shaft, and a pulley is arranged on the output shaft and the motor is driven by a belt.
  • the utility model is characterized in that: a pulley inner lining is arranged between the pulley and the output shaft, wherein the pulley inner lining is fixed with the output shaft, and a locking structure is arranged between the pulley and the inner lining of the pulley, the locking structure enables the pulley to rotate
  • the pulley inner lining rotates, and the pulley and the inner lining of the pulley are further provided with a spring
  • the locking structure is provided with a rotation margin for enabling the pulley to rotate relative to the pulley lining, and the rotation margin causes the locking structure to act on the pulley and the belt Before the wheel lining, the spring is pressed.
  • the locking structure comprises at least one convex locking head uniformly disposed on the inner circumferential surface of the pulley, and the outer circumferential surface of the pulley inner liner is provided with a locking groove corresponding to the locking head.
  • the lock head has an obtuse-angled triangular shape
  • the lock groove is an obtuse-angled triangular groove corresponding to the lock head.
  • the friction structure comprises at least one friction block rotatably connected to the pulley inner liner
  • the base is provided with a cylindrical portion extending to the pulley
  • a friction sleeve is fixed on the outer circumference of the cylindrical portion
  • the corresponding friction block is provided with a protrusion. After the pulley loses power, the spring releases the elastic force, and the pulley inner lining drives the friction block to rotate, and the protrusion applies pressure to press the friction block against the friction sleeve.
  • the friction block has a circular arc-shaped structure, and one end of the friction block is rotatably connected to the pulley inner lining through a pin shaft, and a circular arc groove is arranged on the inner arc surface of the friction block, and a circular arc-shaped friction plate is mounted.
  • the inner arc surface of the friction plate protrudes from the groove and frictionally engages with the friction sleeve.
  • the outer curved surface of the friction block is provided with a chamfered surface
  • the convex portion is a wedge structure
  • the inclined wedge surface cooperates with the chamfered surface
  • the pulley and the pulley inner lining of the invention are equipped with a compression spring, and the pulley and the pulley inner lining can realize relative rotation of a certain displacement.
  • the inner protruding portion of the pulley is paired with the movable friction block mounted on the pulley inner lining.
  • Figure 1 is a schematic view of the structure of the present invention (brake state);
  • Figure 2 is a schematic view of the friction structure of the present invention (brake state);
  • Figure 3 is a schematic diagram of contact between the pulley, the pulley lining and the spring (brake state);
  • Figure 4 is a schematic view of the friction structure of the present invention (working state);
  • Figure 5 is a schematic diagram of the contact between the pulley, the pulley lining and the spring (operating state).
  • FIG. 1 to FIG. 5 The embodiment of the brake structure of the lawn mower of the present invention is specifically described below with reference to FIG. 1 to FIG. 5, including a base 1.
  • a motor 7 is fixed on the base and is electrically connected to an output shaft 41.
  • the output shaft is provided with a pulley 2 and a motor.
  • a pulley inner liner 4 is disposed between the pulley and the output shaft, wherein the pulley inner liner is fixed with the output shaft, and a locking structure is arranged between the pulley and the pulley inner liner, the locking structure rotates the pulley
  • the pulley lining can be driven to rotate, and a spring 5 is further disposed between the pulley and the pulley inner lining, and the locking structure is provided with a rotation margin for enabling the pulley to rotate relative to the pulley lining, and the rotation allowance enables the locking structure to function.
  • the locking structure comprises at least one raised locking head 21 uniformly disposed on the inner circumferential surface of the pulley, and the locking circumferential groove is provided on the outer circumferential surface of the pulley inner liner corresponding to the locking head.
  • the lock head has an obtuse-angled triangular shape, and the lock groove is an obtuse-angled triangular groove corresponding to the lock head.
  • the friction structure includes at least one friction block 3 rotatably coupled to the pulley inner liner, the base is provided with a cylindrical portion extending toward the pulley, and a friction sleeve 11 is fixed on the outer circumference of the cylindrical portion, and the inner circumference of the pulley corresponds to
  • the friction block is provided with a protrusion 22, and after the pulley loses power, the spring releases the elastic force, and the pulley inner lining drives the friction block to rotate, and the protrusion applies pressure to press the friction block against the friction sleeve.
  • the friction block has a circular arc-shaped structure, and one end of the friction block is rotatably connected to the pulley inner liner through a pin shaft 42.
  • a circular arc groove 32 is arranged on the inner arc surface of the friction block, and a circular arc-shaped friction plate 31 is mounted.
  • the inner arc surface of the friction plate protrudes from the groove and frictionally engages with the friction sleeve.
  • a chamfered surface 33 is disposed on the outer arc surface of the friction block, and the protrusion 22 is a wedge structure, and the inclined wedge surface cooperates with the chamfered surface.
  • the lock acts to drive the pulley lining together, and the pulley no longer presses the movable friction block, and the movable friction block is in the centrifugal force. Under the action of disengagement from the friction sleeve, the blade on the inner lining of the pulley starts to move.
  • the spring between the pulley and the inner liner of the pulley is compressed; after the power is turned off, the pulley loses power, and the pulley and the pulley lining Relative motion caused by the elastic force released by the compressed spring (the speed difference between the pulley and the inner liner of the pulley), the pulley pushes the friction friction sleeve of the movable friction block, and the pulley liner stops moving, thereby The blade stops moving and the mower is in the brake state.

Abstract

一种割草机刹车结构,包括基座(1),基座(1)上固定一电机(7)并转动连接一输出轴(41),输出轴(41)上设有一皮带轮(2)与电机(7)之间通过皮带传动,皮带轮(2)与输出轴(41)之间设有一带轮内衬(4),带轮内衬(4)与输出轴(41)固定,皮带轮(2)与带轮内衬(4)间设有锁定结构,该锁定结构使皮带轮(2)转动时能够带动带轮内衬(4)转动,皮带轮(2)与带轮内衬(4)间设有弹簧(5),皮带轮(2)与带轮内衬(4)间还设有摩擦结构,皮带轮(2)失去动力后,弹簧(5)释放弹力使带轮内衬(4)相对皮带轮(2)反转从而摩擦结构作用。皮带轮(2)和带轮内衬(4)可实现一定位移的相对转动,在转动的过程中,皮带轮(2)内侧凸出部对装配于带轮内衬(4)上的活动摩擦块(3)提供压力或释放压力,从而有效的保证刹车结构可靠的运行,因而结构紧凑,操作方便,系统稳定可靠。

Description

_ - 割草机刹车结构 技术领域
本发明涉及割草机刹车装置。
背景技术
割草机是一种普遍使用园林工具, 适用于对草进行修剪。 但由于结构原因, 现有割草机的机械刹车结构存在着不稳定, 刹车时间波动大的弊端。
发明内容
本发明所要解决的技术问题就是提供一种结构简单, 成本低廉, 刹车可靠 稳定的割草机刹车结构。
为解决上述技术问题, 本发明采用如下技术方案: 割草机刹车结构, 包括 基座, 基座上固定一电机并转动连接一输出轴, 输出轴上设有一皮带轮与电机 之间通过皮带传动, 其特征在于: 所述皮带轮与输出轴之间设有一带轮内衬, 其中带轮内衬与输出轴固定, 皮带轮与带轮内衬间设有锁定结构, 该锁定结构 使皮带轮转动时能够带动带轮内衬转动, 而且皮带轮与带轮内衬间还设有弹簧, 锁定结构设有使皮带轮能够相对带轮内衬做转动的转动余量, 该转动余量使锁 定结构作用在皮带轮与带轮内衬前, 弹簧被压^ :带轮与带轮内衬间还设有 摩擦结构, 皮带轮失去动力后, 弹簧释放弹力使带轮内衬相对皮带轮反转, 从 而摩擦结构作用使带轮内衬停止转动。
作为优选, 所述锁定结构包括皮带轮内圆周面上均匀设置的至少一个凸起 的锁头, 带轮内衬外圆周面上对应所述锁头设置有锁槽。
作为优选, 所述锁头呈钝角三角形凸起状, 所述锁槽为对应所述锁头的钝 角三角形槽。 作为优选, 所述摩擦结构包括转动连接在带轮内衬上的至少一个摩擦块, 所述基座设有伸向皮带轮的筒状部, 筒状部外圆周上固定有摩擦套, 皮带轮内 圆周对应摩擦块设有凸起, 带轮失去动力后, 弹簧释放弹力, 带轮内衬带动摩 擦块转动, 凸起施压使摩擦块压向摩擦套。
作为优选, 所述摩擦块为圆弧形结构, 摩擦块一端通过一销轴转动连接在 带轮内衬上, 摩擦块内弧面上设有一圆弧凹槽, 一圆弧形的摩擦片安装于所述 凹槽内, 摩擦片内弧面突出于所述凹槽并与摩擦套摩擦配合。
作为优选, 所述摩擦块外弧面上设有斜切面, 所述凸起为一斜楔结构, 斜 楔斜面与所述斜切面配合。
本发明皮带轮和带轮内衬装配有压簧, 皮带轮和带轮内衬可实现一定位移 的相对转动, 在转动的过程中, 皮带轮内侧凸出部对装配于带轮内衬上的活动 摩擦块提供压力或释放压力, 从而有效的保证刹车结构可靠的运行, 因而结构 紧凑, 操作方便, 系统稳定可靠, 有效地实现了相关的功能。
附图说明
下面结合附图和具体实施方式对本发明作进一步描述:
图 1为本发明的结构示意图 (刹车状态);
图 2为本发明摩擦结构示意图 (刹车状态);
图 3为皮带轮、 带轮内衬、 弹簧的接触示意图 (刹车状态);
图 4为本发明摩擦结构示意图 (工作状态);
图 5为皮带轮、 带轮内衬、 弹簧的接触示意图 (工作状态)。
具体实施方式
下面结合图 1至图 5具体说明本发明割草机刹车结构的实施例,包括基座 1, 基座上固定一电机 7并转动连接一输出轴 41, 输出轴上设有一皮带轮 2与电机 之间通过皮带传动, 所述皮带轮与输出轴之间设有一带轮内衬 4, 其中带轮内衬 与输出轴固定, 皮带轮与带轮内衬间设有锁定结构, 该锁定结构使皮带轮转动 时能够带动带轮内衬转动, 而且皮带轮与带轮内衬间还设有弹簧 5, 锁定结构设 有使皮带轮能够相对带轮内衬做转动的转动余量, 该转动余量使锁定结构作用 在皮带轮与带轮内衬前, 弹簧被压缩, 皮带轮与带轮内衬间还设有摩擦结构, 皮带轮失去动力后, 弹簧释放弹力使带轮内衬相对皮带轮反转, 从而摩擦结构 作用使带轮内衬停止转动。 所述锁定结构包括皮带轮内圆周面上均匀设置的至 少一个凸起的锁头 21, 带轮内衬外圆周面上对应所述锁头设置有锁槽 43。 所述 锁头呈钝角三角形凸起状, 所述锁槽为对应所述锁头的钝角三角形槽。 所述摩 擦结构包括转动连接在带轮内衬上的至少一个摩擦块 3,所述基座设有伸向皮带 轮的筒状部, 筒状部外圆周上固定有摩擦套 11, 皮带轮内圆周对应摩擦块设有 凸起 22, 带轮失去动力后, 弹簧释放弹力, 带轮内衬带动摩擦块转动, 凸起施 压使摩擦块压向摩擦套。 所述摩擦块为圆弧形结构, 摩擦块一端通过一销轴 42 转动连接在带轮内衬上, 摩擦块内弧面上设有一圆弧凹槽 32, 一圆弧形的摩擦 片 31安装于所述凹槽内, 摩擦片内弧面突出于所述凹槽并与摩擦套摩擦配合。 所述摩擦块外弧面上设有斜切面 33, 所述凸起 22为一斜楔结构, 斜楔斜面与所 述斜切面配合。
割草机通电启动后, 皮带轮运动, 运动到带轮内衬的锁槽边缘处时, 锁头 作用带动带轮内衬一起运动, 此时皮带轮不再压住活动摩擦块, 活动摩擦块在 离心力的作用下与摩擦套脱开, 带轮内衬上的刀片开始运动, 此过程中, 皮带 轮与带轮内衬间的弹簧被压缩; 关断电源后, 皮带轮失去动力, 皮带轮与带轮 内衬在被压缩的弹簧释放的弹力作用下产生相对运动 (皮带轮与带轮内衬间产 生速度差), 皮带轮推动活动摩擦块摩擦摩擦套, 促使带轮内衬停止运动, 从而 实现刀片停止运动, 割草机处于刹车状态。
除上述优选实施例外, 本发明还有其他的实施方式, 本领域技术人员可以 根据本发明作出各种改变和变形, 只要不脱离本发明的精神, 均应属于本发明 所附权利要求所定义的范围。

Claims

权 利 要 求 书
1、 割草机刹车结构, 包括基座 (1 ), 基座上固定一电机 (7 ) 并转动连接一 m 出轴 (41 ), 输出轴与电机之间通过皮带轮 (2) 皮带传动, 其特征在于: 所述 皮带轮与输出轴之间设有一带轮内衬 (4), 其中带轮内衬与输出轴固定, 皮带 轮与带轮内衬间设有锁定结构, 该锁定结构使皮带轮转动时能够带动带轮内衬 转动, 而且皮带轮与带轮内衬间还设有弹簧 (5 ), 锁定结构设有使皮带轮能够 相对带轮内衬做转动的转动余量, 该转动余量使锁定结构作用在皮带轮与带轮 内衬前, 弹簧被压^ :带轮与带轮内衬间还设有摩 :带轮失去动力 后, 弹簧释放弹力使带轮内衬相对皮带轮反转, 从而摩擦结构作用使带轮内衬 停止转动。
2、 根据权利要求 1所述的割草机刹车结构, 其特征在于: 所述锁定结构包括皮 带轮内圆周面上均匀设置的至少一个凸起的锁头 (21 ), 带轮内衬外圆周面上对 应所述锁头设置有锁槽 (43 )。
3、 根据权利要求 2所述的割草机刹车结构, 其特征在于: 所述锁头 (21 ) 呈钝 角三角形凸起状, 所述锁槽 (43 ) 为对应所述锁头的钝角三角形槽。
4、 根据权利要求 1至 3任一项所述的割草机刹车结构, 其特征在于: 所述摩擦 结构包括转动连接在带轮内衬上的至少一个摩擦块 (3 ), 所述基座设有伸向皮 带轮的筒状部, 筒状部外圆周上固定有摩擦套 (11 ), 皮带轮内圆周对应摩擦块 设有凸起 (22), 带轮失去动力后, 弹簧释放弹力, 带轮内衬带动摩擦块转动, 凸起施压使摩擦块压向摩擦套。
5、 根据权利要求 4所述的割草机刹车结构, 其特征在于: 所述摩擦块 (3 ) 为 圆弧形结构, 摩擦块一端通过一销轴 (42) 转动连接在带轮内衬上, 摩擦块内 弧面上设有一圆弧凹槽 (32), 一圆弧形的摩擦片 (31 ) 安装于所述凹槽内, 摩 擦片内弧面突出于所述凹槽并与摩擦套摩擦配合。 权 利 要 求 书
6、 根据权利要求 5所述的割草机刹车结构, 其特征在于: 所述摩擦块 (3 ) 外 弧面上设有斜切面 (33 ), 所述凸起 (22) 为一斜楔结构, 斜楔斜面与所述斜切 面配合。
PCT/CN2011/080724 2011-08-30 2011-10-13 割草机刹车结构 WO2013029292A1 (zh)

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