Ratchet type tensioner

Abstract

The invention provides a ratchet type tensioner. A ratchet mechanism comprising a plunger and a ratchet is simply and conveniently disengaged when the tensioner is maintained and repaired, the ratchet mechanism reliably and stably operates when an engine operates, malfunction is avoided, so that shaking sound is reduced, and hot sticking of the plunger is prevented. In the ratchet type tensioner (100), a ratchet removing mechanism for disengaging ratchet teeth (151) of the ratchet (150) from rack teeth (122) of the plunger (120) by a tool pin (T) comprises a tool pin clamping portion (154) and a pin inserting hole (114), the tool pin clamping portion (154) is arranged in a front end area of a plunger side of the ratchet (150) and used for abutting and clamping the front end (T1) of the tool pin (T), the pin inserting hole (114) is formed in a shell body (110) and faces the tool pin clamping portion (154), and the tool pin (T) is inserted into the pin inserting hole (114).

Description

technical field [0001] The present invention relates to a ratchet type tensioner that applies tension to a timing chain such as a camshaft that drives an engine. Background technique [0002] In the prior art, there is known a tensioner used for a timing chain that drives a camshaft of an engine, etc., which acts on a spring and a protruding force generated by external hydraulic pressure to slidably insert into a The plunger of the oil chamber is formed between the housing and the housing, thereby imparting tension to the timing chain. [0003] Such as Figure 16 As shown, as such a conventional tensioner, for example, a tensioner 500 having the following structure can be used. The tensioner 500 includes: a piston 526, which is slidably inserted into the housing 512 in a direction perpendicular to the sliding direction of the plunger 514, thereby forming an auxiliary oil chamber 520 with the housing 512; an oil passage 544, It is used to make the external hydraulic pressur...

AI Technical Summary

Problems solved by technology

[0008] Moreover, in the above-mentioned existing tensioner 500, since the plunger 514 and the piston 526 have a cylindrical structure, there is the following problem: the rack of the plunger 514 is damaged in response to the vibration of the plunger 514 when the engine is driven. 538 and the meshing teeth 536 of the piston 526 present an excessively locked state, and the meshing teeth 536 of the piston 526 are prone to lack of teeth, and soon distort throughout the entire area of ​​the tooth width and become meshing mismatches, resulting in The ratchet mechanism composed of the meshing teeth 536 and the rack 538 produces malfunctions; in addition, during the manufacture and maintenance of the tensioner, the plunger 514 and the piston 526 rotate around their respective axes, resulting in misassembly of each other

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