A double hydraulic automatic tensioner

Abstract

The invention discloses a double-hydraulic automatic tensioner, and relates to the field of transmission devices. The double-hydraulic automatic tensioner comprises a cylinder body, a channel is formed in the cylinder body, a damping liquid is arranged in the channel, a movable retainer is arranged in the middle of the channel, two pistons and two springs are arranged in the channel, the two endsof the channel are provide with a piston rod in a insert mode respectively, one end of each piston rod is connected with one piston, and the other end of each piston rod is rotationally connected witha tensioning wheel, the pistons are provided with one-way channels, and each one-way channel is internally provided with a steel bead matched with the one-way channel, an extrusion spring is arrangedin each one-way channel, and through holes are formed in the sides, close to the adjacent piston rods, of the pistons, throttling channels are formed in the sides, close to the adjacent piston rods,of the pistons, and throttling valves are arranged in the throttling channels. According to the double-hydraulic automatic tensioner, hydraulic devices are adopted, the kinetic energy is converted into the heat energy of the damping liquid, and meanwhile, the movable retainer is additionally arranged, the damping force between the two tensioning wheels is distributed, and the double-hydraulic automatic tensioner with good damping performance is provided.

Description

technical field [0001] The invention belongs to the field of transmission devices, in particular to a dual-hydraulic automatic tensioner. Background technique [0002] The tensioner is a commonly used holding device on the belt and chain transmission system. Its characteristic is to keep the belt and chain with proper tension during the transmission process, so as to avoid the belt slipping, or to prevent the synchronous belt from skipping teeth or detaching the teeth. Drag out; in the prior art, the damping is easy to attenuate. [0003] China Patent Authorization Announcement No. CN201818744U, authorized announcement date 20110504, discloses "a kind of tapered friction belt automatic tensioner"; including automatic tensioner body, friction damping system and belt transmission system, said friction damping system includes cone shaped bushing, tapered friction plate and tension arm; the belt drive system includes pulleys, bolts, rolling bearings, and dust covers; the spring...

AI Technical Summary

Problems solved by technology

[0002] The tensioner is a commonly used holding device on the belt and chain transmission system. Its characteristic is to keep the belt and chain with proper tension during the transmission process, so as to avoid the belt slipping, or to prevent the synchronous belt from skipping teeth or detaching the teeth. Drag out; in the prior art, the damping is easy to attenuate

[0003] China Patent Authorization Announcement No. CN201818744U, authorized announcement date 20110504, discloses "a kind of tapered friction belt automatic tensioner"; including automatic tensioner body, friction damping system and belt transmission system, said friction damping system includes cone shaped bushing, tapered friction plate and tension arm; the belt drive system includes pulleys, bolts, rolling bearings, and dust covers; the spring chamber is fixed on the engine as a base, and the tension arm takes the bolt as the center of rotation Rotation, the tension arm is connected to one end of the spring, and the other end of the spring is connected to the spring chamber; the working principle is that the damping member slides relative to other contact surfaces, thereby converting kinetic energy into heat energy. Gradually wear out due to long-term sliding friction

When the working condition of FEAD changes drastically, the worn damping parts are difficult to normally attenuate the vibration of the system due to the reduced damping, so the swing angle of the tensioning arm increases, which further aggravates the wear of the damping parts, resulting in a continued decrease in damping. Dampers quickly lose their usefulness

Not only the damping parts, but the drastic change of the swing angle of the tensioning arm may also cause problems such as system noise and aggravated impact between the tensioning arm and the limit block, which will cause the tensioner to fail prematurely

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