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    • 6. 发明授权
    • Tensioner device for chain drive mechanism
    • 链条驱动机构的张紧装置
    • US6146300A
    • 2000-11-14
    • US300996
    • 1999-04-28
    • Tadasu SuzukiKatsuya NakakuboShigekazu Fukuda
    • Tadasu SuzukiKatsuya NakakuboShigekazu Fukuda
    • F16H7/08F16H7/00
    • F16H7/08F16H2007/0806F16H2007/0812F16H2007/0853F16H2007/0859F16H2007/0893
    • A tensioner device for adjusting a tension in a chain wound around two sprockets includes a tensioner lever held in sliding contact with a slack run of the chain, an oil-filled tensioner provided on a stationary member, and a ratchet tensioner provided on the tensioner lever. The oil-filled tensioner includes a piston movable back and forth relatively to a housing attached to the stationary member, and a spring urging the piston in the forward direction. The ratchet tensioner includes a plunger movable in the forward direction relative to a housing formed integrally with the tensioner lever, and a spring urging the plunger in the forward direction. The piston and the plunger are held in face-to-face abutment with each other. The spring of the oil-filled tensioner has a larger spring coefficient than the spring of the ratchet tensioner. With this construction, when a sag of the chain is in excess of the forward stroke of the piston of the oil-filled tensioner, the plunger of the ratchet tensioner moves forward to cover a shortage of forward stroke of the piston. The tensioner device can continue proper tension-adjusting operation over a long period of use of a chain drive mechanism in which it is incorporated.
    • 用于调节缠绕在两个链轮上的链条中的张力的张紧器装置包括与链条的松弛行程滑动接触的张紧器杆,设置在固定构件上的充油张紧器和设置在张紧器杆上的棘轮张紧器 。 充油张紧器包括可相对于附接到固定构件的壳体来回移动的活塞,以及沿向前方向推动活塞的弹簧。 棘轮张紧器包括可相对于与张紧器杆一体地形成的壳体向前方移动的柱塞和沿向前方向推动柱塞的弹簧。 活塞和柱塞彼此面对面地抵接。 充油张紧器的弹簧具有比棘轮张紧器的弹簧更大的弹簧系数。 利用这种结构,当链条的下垂超过充满油的张紧器的活塞的向前冲程时,棘轮张紧器的柱塞向前移动以覆盖活塞向前冲程的不足。 张紧器装置可以在其被并入的链条驱动机构的长时间使用中继续适当的张力调节操作。
    • 7. 发明授权
    • Hydraulic tensioner
    • 液压张紧器
    • US5709625A
    • 1998-01-20
    • US641080
    • 1996-04-26
    • Katsuya NakakuboSumio Watanabe
    • Katsuya NakakuboSumio Watanabe
    • F02B67/06F01L1/02F15B15/14F16H7/08F16H7/12
    • F01L1/024F01L1/02F01L1/022F15B15/14F02B67/06F16H2007/0859
    • A hydraulic tensioner 10 includes a hollow housing 14 having formed therewith an intermediate partition wall 12, a circular hollow cylinder 16 disposed concentrically in the housing 14, and a piston rod 18 slidably received in the cylinder 16 with a small gap or clearance therebetween. The cylinder 16 and the piston rod 18 jointly define therebetween a high pressure oil chamber 20. The pressure in the high pressure oil chamber 20 counteracts the force tending to retract the piston rod 18. The piston rod 18 projects from an open end of the housing 14, and a seal 24 surrounds the piston rod 18 to seal or close the end of the housing 14. The piston rod 18 has secured thereto a rod guide 28 disposed within the low pressure oil chamber 26. A spring 36 is disposed in a compressed condition between the housing 14 and the rod guide 28 to urge the piston rod 18 in the advancing direction. The rod guide 28 has radially elongated oil holes or passages 38 formed in its surface which engages the spring 36. The oil passages 38 extend radially outwardly from an inner peripheral surface of the rod guide 28 press fitted with the piston rod 18 and also extends axially through the rod guide 28, and are positioned so that they are not closed by the end of the spring.
    • 液压张紧器10包括中空壳体14,其中形成有中间分隔壁12,同心地设置在壳体14中的圆形中空圆柱体16和可滑动地容纳在气缸16中的活塞杆18,其间具有小的间隙或间隙。 气缸16和活塞杆18在其间共同限定高压油室20.高压油室20中的压力抵抗倾向于缩回活塞杆18的力。活塞杆18从壳体的开口端突出 并且密封件24围绕活塞杆18以密封或关闭壳体14的端部。活塞杆18固定到其上,设置在低压油室26内的杆引导件28.弹簧36设置在压缩 在壳体14和杆导向件28之间的状态,以便沿前进方向推动活塞杆18。 杆导向件28具有形成在其表面上的径向细长的油孔或通道38,其与弹簧36接合。油通道38从压杆配合活塞杆18的杆导向器28的内周表面径向向外延伸, 通过杆导向件28定位,使得它们不被弹簧的端部封闭。