公开(公告)号：US5632474A

公开(公告)日：1997-05-27

申请号：US539157

申请日：1995-10-04

申请人： Hisashi Hayakawa ,  Kazuki Kawashima ,  Norio Yamazaki ,  Ken Yamamoto ,  Satoshi Kitano

发明人： Hisashi Hayakawa ,  Kazuki Kawashima ,  Norio Yamazaki ,  Ken Yamamoto ,  Satoshi Kitano

IPC分类号： F16H7/08 ,  F16H7/12

CPC分类号： F16H7/1236 ,  F16H2007/0806 ,  F16H2007/0859 ,  F16H2007/0891

摘要： A hydraulic autotensioner has a cylinder having a closed bottom end, a sleeve mounted in the cylinder and a plunger slidably mounted in the sleeve. The interior of the cylinder is divided into a reservoir chamber and a pressure chamber by the plunger which is formed with a passage through which the reservoir chamber and the pressure chamber communicate with each other. A check valve is provided in the passage to close the passage if the pressure of hydraulic oil in the pressure chamber increases above the pressure of hydraulic oil in the reservoir chamber. A return spring is mounted in the cylinder to bias a rod which is axially movable together with the plunger in such a direction as to protrude from an upper opening of the cylinder. The return spring is mounted in a space formed between the outer peripheral surface of the sleeve and the inner peripheral surface of the cylinder.

摘要翻译： 液压自动张紧器具有一个具有封闭的底端的圆柱体，安装在圆柱体中的套筒和可滑动地安装在套筒中的柱塞。 气缸的内部通过柱塞分成储存室和压力室，柱塞形成有通道，储存室和压力室通过该通道相互连通。 如果压力室中的液压油的压力升高到储存室中的液压油的压力，则在通道中设置止回阀以关闭通道。 回转弹簧安装在气缸中以偏压杆，该杆可以与柱塞一起沿着从气缸的上部开口突出的方向轴向移动。 复位弹簧安装在形成于套筒的外周面与气缸的内周面之间的空间中。

公开(公告)号：US5482262A

公开(公告)日：1996-01-09

申请号：US310994

申请日：1994-09-23

申请人： Hisashi Hayakawa ,  Kazuki Kawashima ,  Norio Yamazaki ,  Ken Yamamoto ,  Satoshi Kitano

发明人： Hisashi Hayakawa ,  Kazuki Kawashima ,  Norio Yamazaki ,  Ken Yamamoto ,  Satoshi Kitano

IPC分类号： F16H7/08 ,  F16H7/12

CPC分类号： F16H7/1236 ,  F16H2007/0806 ,  F16H2007/0859 ,  F16H2007/0891

摘要： A hydraulic autotensioner has a cylinder having a closed bottom end, a sleeve mounted in the cylinder and a plunger slidably mounted in the sleeve. The interior of the cylinder is divided into a reservoir chamber and a pressure chamber by the plunger which is formed with a passage through which the reservoir chamber and the pressure chamber communicate with each other. A check valve is provided in the passage to close the passage if the pressure of hydraulic oil in the pressure chamber increases above the pressure of hydraulic oil in the reservoir chamber. A return spring is mounted in the cylinder to bias a rod which is axially movable together with the plunger in such a direction as to protrude from an upper opening of the cylinder. The return spring is mounted in a space formed between the outer peripheral surface of the sleeve and the inner peripheral surface of the cylinder.

摘要翻译： 液压自动张紧器具有一个具有封闭的底端的圆柱体，安装在圆柱体中的套筒和可滑动地安装在套筒中的柱塞。 气缸的内部通过柱塞分成储存室和压力室，柱塞形成有通道，储存室和压力室通过该通道相互连通。 如果压力室中的液压油的压力升高到储存室中的液压油的压力，则在通道中设置止回阀以关闭通道。 回转弹簧安装在气缸中以偏压杆，该杆可以与柱塞一起沿着从气缸的上部开口突出的方向轴向移动。 复位弹簧安装在形成于套筒的外周面与气缸的内周面之间的空间中。

公开(公告)号：US4986796A

公开(公告)日：1991-01-22

申请号：US485664

申请日：1990-02-27

申请人： Kazuki Kawashima ,  Hisashi Hayakawa

发明人： Kazuki Kawashima ,  Hisashi Hayakawa

IPC分类号： F16H7/08 ,  F16H7/12

CPC分类号： F16H7/1236 ,  F16H2007/0806 ,  F16H2007/0859 ,  F16H2007/0891

摘要： An autotensioner for controlling the tension of a belt. It is filled with a hydraulic oil containing poly-.alpha.-olefin as a basic ingredient. Since such an oil has excellent viscosity-temperature properties as well as good lubricating properties, a body and a piston slidably mounted in the body are abraded less at their sliding surface than with a prior art autotensioner and thus the size of an oil leakage gap formed therebetween is less subject to change. This will prevent cavitation in a pressure chamber formed in the body.

摘要翻译： 用于控制皮带张力的自动张紧器。 充满含有聚α-烯烃作为基本成分的液压油。 由于这种油具有优异的粘度 - 温度特性以及良好的润滑性能，所以与现有技术的自动张紧器相比，可滑动地安装在本体中的主体和活塞在滑动面上磨损较少，因此形成了漏油间隙的尺寸 其间不太可能改变。 这将防止在体内形成的压力室中发生气蚀。

公开(公告)号：US4950209A

公开(公告)日：1990-08-21

申请号：US394032

申请日：1989-08-15

申请人： Kazuki Kawashima ,  Hisashi Hayakawa

发明人： Kazuki Kawashima ,  Hisashi Hayakawa

IPC分类号： F16F3/07 ,  F16H7/08 ,  F16H7/12

CPC分类号： F16H7/1236 ,  F16H2007/0806 ,  F16H2007/0859 ,  F16H2007/0891

摘要： An autotensioner includes a cylinder having its bottom closed and filled with a hydraulic oil and air, an oil seal mounted in the cylinder to seal the hydraulic oil and air, a rod slidably extending through the oil seal, and a piston slidably mounted in the cylinder with its top end abutting the bottom of the rod. The interior of the cylinder is separated into an upper reservoir chamber and a lower pressure chamber by the piston. Both chambers communicate with each other through a channel formed in the piston. The rod is biased by a spring mounted in the reservoir chamber in such a direction as to protrude from the cylinder. A check valve is provided in the pressure chamber near the bottom of the piston to open the channel in the piston only when the pressure in the pressure chamber is lower than the pressure in the reservoir chamber. The cylinder may have an outer casing and an inner sleeve so that the piston can slide on the inner surface of the sleeve.

摘要翻译： 自动张紧器包括其底部封闭并充满液压油和空气的气缸，安装在气缸中以密封液压油和空气的油封，可滑动地延伸穿过油封的杆，以及可滑动地安装在气缸中的活塞 其顶端邻接杆的底部。 气缸的内部通过活塞被分离成上储存室和下压室。 两个腔室通过形成在活塞中的通道相互连通。 杆被安装在储存室中的弹簧以从气缸突出的方向被偏压。 止回阀设置在靠近活塞底部的压力室中，仅当压力室中的压力低于储存室中的压力时才能打开活塞中的通道。 气缸可以具有外壳和内套筒，使得活塞可以在套筒的内表面上滑动。

公开(公告)号：US4940447A

公开(公告)日：1990-07-10

申请号：US351129

申请日：1989-05-12

申请人： Kazuki Kawashima ,  Makoto Yasui ,  Hisashi Hayakawa ,  Masayuki Imoto

发明人： Kazuki Kawashima ,  Makoto Yasui ,  Hisashi Hayakawa ,  Masayuki Imoto

IPC分类号： F02B67/06 ,  F16F13/00 ,  F16H7/08 ,  F16H7/12

CPC分类号： F16H7/0836 ,  F16F13/00 ,  F16H7/0848 ,  F16H2007/0806 ,  F16H2007/0859 ,  F16H2007/0891

摘要： An autotensioner for adjusting the tension of a timing belt used with an automotive engine. It includes a cylinder case filled with a hydraulic oil, a piston partitioning the interior of the cylinder case into a pressure chamber and a reservoir chamber and a push rod having its bottom end coupled to the piston and the top end adapted to protrude from the cylinder case. A spring is provided to bias the piston and the push rod upwardly. The pressure chamber communicates with the reservoir chamber through a channel formed through the piston. A plate-shaped check valve is provided in the pressure chamber to open and close the bottom of the channel. The plate-shaped valve can respond quickly to the fluctuation of pressure in the pressure chamber because of its reduced mass. Thus, when the piston and the push rod rise biased by the spring, the valve can move quickly to such a position as to open the channel, thus allowing the hydraulic oil in the reservoir chamber to flow quickly and smoothly back into the pressure chamber. This will prevent cavitation in the pressure chamber. The responsiveness of the valve will be improved further by providing another spring for biassing the valve in such a direction as to open the channel.

摘要翻译： 用于调节与汽车发动机一起使用的同步皮带张力的自动张紧器。 它包括装有液压油的气缸壳体，将气缸壳体的内部分隔成压力室和储存室的活塞和其底端联接到活塞的推杆，并且顶端适于从气缸突出 案件。 提供弹簧以向上偏压活塞和推杆。 压力室通过穿过活塞形成的通道与贮存室连通。 在压力室中设置有一个板形止回阀，以打开和关闭通道的底部。 板状阀由于质量下降而能够快速响应压力室内的压力波动。 因此，当活塞和推杆被弹簧上升时，阀可快速移动到打开通道的位置，从而允许储存室中的液压油快速平稳地流回压力室。 这将防止压力室中的气蚀。 阀门的响应性将进一步提高，方法是提供另一个弹簧，用于沿打开通道的方向偏压阀门。

公开(公告)号：US4904230A

公开(公告)日：1990-02-27

申请号：US382938

申请日：1989-07-21

申请人： Kazuki Kawashima ,  Hisashi Hayakawa

发明人： Kazuki Kawashima ,  Hisashi Hayakawa

IPC分类号： F16H7/08 ,  F16H7/12

CPC分类号： F16H7/1236 ,  F16H2007/0806 ,  F16H2007/081 ,  F16H2007/0844 ,  F16H2007/0859 ,  F16H2007/0878 ,  F16H2007/0891

摘要： A belt autotensioner for giving a desired tension to a belt. It includes a tension pulley pressed against the belt, an eccentric shaft extending through the tension pulley to rotatably support it and formed with a hole arranged eccentrically from the axis of the tension pulley, an actuator having a cylinder and a push rod silidably mounted in the cylinder and having its one end protruding from the cylinder and butting a projection fixed to the eccentric shaft, a bolt extending through the hole in the eccentric shaft and the cylinder of the actuator to pivotally support the eccentric shaft and a spring for biasing the eccentric shaft to pivot it in such a direction as to increase the tension of the belt. The spring may be a torsion coil spring mounted around the eccentric shaft with its one end fixed to the outer periphery of the eccentric shaft and the other end fixed to the cylinder of the actuator.

摘要翻译： 一种用于给皮带提供所需张力的皮带自动张紧器。 其包括被压靠在皮带上的张力滑轮，偏心轴延伸穿过张力滑轮以可旋转地支撑并形成有从张力皮带轮的轴线偏心布置的孔;致动器，具有可滑动地安装在 气缸，其一端从气缸突出并且对接固定到偏心轴的突起，延伸穿过偏心轴中的孔和致动器的气缸的螺栓枢转地支撑偏心轴和用于偏置偏心轴的弹簧 以使其沿着增加带的张力的方向枢转。 弹簧可以是围绕偏心轴安装的扭力螺旋弹簧，其一端固定在偏心轴的外周，另一端固定在致动器的气缸上。

公开(公告)号：US20060116229A1

公开(公告)日：2006-06-01

申请号：US11283751

申请日：2005-11-22

申请人： Seiji Sato ,  Satoshi Kitano ,  Hisashi Hayakawa

发明人： Seiji Sato ,  Satoshi Kitano ,  Hisashi Hayakawa

IPC分类号： F16H7/08 ,  F16H7/22

CPC分类号： F16H7/0848 ,  F16H2007/0806 ,  F16H2007/0812 ,  F16H2007/0814 ,  F16H2007/0853 ,  F16H2007/0855 ,  F16H2007/0859

摘要： A chain tensioner includes a housing formed with a cylinder chamber in which a plunger is slidably mounted. A return spring, also mounted in the cylinder chamber, biases the plunger outwardly of the cylinder chamber. The housing is formed with an oil supply passage communicating with a pressure chamber defined in the cylinder chamber by the plunger. A check valve is provided at the outlet of the oil supply passage. An oil filter is mounted in the inlet of the oil supply passage. The oil filter removes foreign objects contained in hydraulic oil supplied into the oil supply passage, thereby preventing malfunction of the chain tensioner due to foreign objects getting stuck in moving parts of the chain tensioner.

摘要翻译： 链条张紧器包括形成有气缸室的壳体，柱塞可滑动地安装在该气缸室中。 也安装在气缸室中的复位弹簧将柱塞向气缸室向外偏压。 壳体形成有通过柱塞连通于限定在气缸室中的压力室的供油通道。 在供油通道的出口处设有止回阀。 油过滤器安装在供油通道的入口处。 油过滤器去除供给到供油通道中的液压油中所含的异物，由此防止由于异物卡在链条张紧器的移动部分而导致的链条张紧器的故障。

公开(公告)号：US20100099529A1

公开(公告)日：2010-04-22

申请号：US12581945

申请日：2009-10-20

申请人： Seiji SATO ,  Satoshi Kitano ,  Hisashi Hayakawa ,  Tasuku Furukawa

发明人： Seiji SATO ,  Satoshi Kitano ,  Hisashi Hayakawa ,  Tasuku Furukawa

IPC分类号： F16H7/08

CPC分类号： F16H7/0836 ,  F16H7/0848 ,  F16H2007/0806 ,  F16H2007/0812 ,  F16H2007/0857 ,  F16H2007/0859

摘要： A chain tensioner includes a cylinder having a closed end, a plunger axially slidably inserted in the cylinder and having an internal thread on the inner periphery thereof, a return spring biasing the plunger in the protruding direction from the cylinder, and a screw rod having an external thread that is in threaded engagement with the internal thread of the plunger. The portion of the screw rod protruding from the plunger abuts a rod seat provided in the cylinder. The external thread of the screw rod is formed by rolling. The screw rod has an intermediate portion protruding from the plunger and having an outer diameter smaller than the diameter of the root of the external thread. A contact surface contact surface of the screw rod to be brought into contact with the rod seat is formed on the axial end face of the intermediate portion by forging. The internal thread may be formed by pressing, and a pressed recess may be formed on the outer circumference of the plunger, corresponding to the internal thread.

摘要翻译： 链条张紧器包括具有闭合端的圆柱体，柱塞可轴向滑动地插入圆柱体中，并且在其内周上具有内螺纹;沿柱向突出方向偏置柱塞的复位弹簧，以及具有 与柱塞的内螺纹螺纹接合的外螺纹。 从柱塞突出的螺杆的部分邻接设置在气缸中的杆座。 螺杆的外螺纹由轧制形成。 螺杆具有从柱塞突出并具有小于外螺纹根部直径的外径的中间部分。 通过锻造在中间部的轴向端面上形成与杆座接触的螺杆的接触面接触面。 内螺纹可以通过按压形成，并且可以在对应于内螺纹的柱塞的外周上形成压制凹部。

公开(公告)号：US07677999B2

公开(公告)日：2010-03-16

申请号：US11247254

申请日：2005-10-12

申请人： Seiji Sato ,  Satoshi Kitano ,  Hisashi Hayakawa

发明人： Seiji Sato ,  Satoshi Kitano ,  Hisashi Hayakawa

IPC分类号： F16H7/08 ,  F16H7/22

CPC分类号： F16H7/0848 ,  F16H2007/0806 ,  F16H2007/0812 ,  F16H2007/0853 ,  F16H2007/0855 ,  F16H2007/0859 ,  F16H2007/0878

摘要： A chain tensioner includes a housing defining a cylinder chamber, and a plunger having a small-diameter end and a spring both mounted in the cylinder chamber. A register ring is fitted in a ring-receiving groove formed in the inner periphery of the cylinder chamber near its open end. A plurality of annular grooves are formed in the outer periphery of the plunger so as to be axially spaced from each other at equal intervals. The register ring is adapted to be press-fitted in one of the annular grooves. With the register ring trapped between an engaging surface of a first annular groove which is one of the annular grooves located nearest to the front end of the plunger and a locking surface of the ring-receiving groove, an outer cylindrical surface of the plunger extending forwardly from the first annular groove has its front portion supported by an inner cylindrical surface of the cylinder chamber extending forwardly from the ring-receiving groove.

摘要翻译： 链条张紧器包括限定气缸室的壳体和具有安装在气缸室中的小直径端和弹簧的柱塞。 定位环安装在形成在气缸室的内周的靠近其开口端的环形容纳槽中。 在柱塞的外周形成有多个环形槽，以相等的间隔彼此轴向间隔开。 定位环适于压配合在一个环形槽中。 在第一环形槽的接合表面之间的定位环被捕获在位于最接近柱塞的前端的环形槽中的一个和接纳环的锁定表面之间的柱塞的外圆柱表面向前延伸 该第一环形槽的前部由从环形容纳槽向前延伸的气缸室的内圆柱表面支撑。

公开(公告)号：US07037229B2

公开(公告)日：2006-05-02

申请号：US10693503

申请日：2003-10-27

申请人： Hisashi Hayakawa ,  Satoshi Kitano ,  Tomoyoshi Izutsu ,  Kazuo Komori

发明人： Hisashi Hayakawa ,  Satoshi Kitano ,  Tomoyoshi Izutsu ,  Kazuo Komori

IPC分类号： F16H7/08

CPC分类号： F01L1/02 ,  F01L1/022 ,  F01L1/024 ,  F01L2101/00 ,  F16H7/0836 ,  F16H2007/0806 ,  F16H2007/0859

摘要： A hydraulic tensioner includes a cylinder having a hollow space filled with hydraulic oil. A plunger is slidably mounted in the cylinder. A pushrod is mounted in the hollow space so as to be axially movable together with the plunger with one end thereof protruding from the cylinder. A spring is mounted in the cylinder to bias the plunger and pushrod outwardly of the cylinder. The plunger is formed with a passage through which a pressure chamber and reservoir chamber communicate with each other. The passage is formed with a valve seat. A check ball is arranged so as to be moved into and out of contact with the valve seat. The check ball is adapted to contact the valve seat when pressure in the pressure chamber exceeds pressure in the reservoir chamber, thereby closing the passage. The valve seat is formed of a steel for carburizing and has a surface carbon concentration of 0.55–0.75% to reduce deposition of carbides and to have a surface hardness at least equal to that of the check ball.

摘要翻译： 液压张紧器包括具有充满液压油的中空空间的气缸。 柱塞可滑动地安装在气缸中。 推杆安装在中空空间中，以便与柱塞一起轴向移动，其一端从气缸突出。 弹簧安装在气缸中以将柱塞偏压到气缸的外侧。 柱塞形成有通道，压力室和储存室通过该通道彼此连通。 通道形成有阀座。 一个止回球被布置成与阀座移动和脱离接触。 当压力室中的压力超过储存室中的压力时，止回球适于接触阀座，从而关闭通道。 阀座由用于渗碳的钢形成，并且具有0.55-0.75％的表面碳浓度以减少碳化物的沉积并且具有至少等于止回球的表面硬度。