Nittan Valve Co., Ltd.

Akifumi Tanaka

Yukio Kubota

Michihiro Kameda

The method of the present invention comprises the steps of inserting, the plunger having in the side wall thereof a lower open end and an oil recycling hole in the side wall thereof and provided with a seal member, supplying pressurized air to the plunger through a port formed in the top end of the plunger, testing the internal air tightness of the sealed lash adjuster with the lower end of the plunger and with the oil recycling hole closed when the plunger is inserted in the body, opening the oil recycling hole and further inserting the plunger in the body if the seal member is verified to have satisfactory sealability; and testing the internal air tightness of the lash adjuster to test the sealability of the seal member with the seal member and with the oil recycling hole positioned not to reach the seal member.

Method of testing air tightness of sealed lash adjuster

A hydraulic lash adjuster capable of retaining a Large amount of hydraulic oil in a reservoir communicated with a high-pressure chamber when the engine is stopped. The hydraulic lash adjuster including: a cylindrical body (24) having an upper open end, a closed bottom, and a second oil supply hole (27a) formed in the sidewall of the cylindrical body; and a plunger having a top end serving as a plunging end, a sidewall, a bottom end, a high pressure chamber (29) at the lower bottom, and a first oil supply hole (24b) formed in the sidewall, the plunger being slidabic on the inner wall of the body. The plunger has a reservoir (28) that communicates with an external oil supply line (32) via the first oil supply hole (24b) and the second oil supply hole (27a).

Hydraulic lash adjuster for internal combustion engine

A mechanical adjuster that automatically increases or decreases or decreases valve clearance is provided that includes: a housing () having threaded portions (); a threaded member () thread-coupled with the threaded portion (); a threaded member () connected to the threaded member () via mutual rotation prevention-couplings () and thread-coupled with the threaded portion (). When a load acting on the threaded member () is equal to or less than a valve closing load, valve clearance is decreased by an integrated rotation of the threaded members (). with a slip torque of the threaded member ()&#x3e;a self-locking torque of the threaded member (). When a load acting on the threaded member () is close to or exceeds a valve opening load, valve clearance is increased by an integral rotation of the threaded members () with the absolute value of a slip torque of the threaded member ()&#x3e;a self-locking torque of the threaded member ().

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Hadano, Japan

Akifumi Tanaka