Valve seat finishing devices

Abstract

A valve seat finishing device for use with a spindle having a drive is provided. The valve seat finishing device includes a driver, a valve seat finishing tool, an annular finishing surface on the tool, and a non-dressable super abrasive on the annular finishing surface. The driver has a centering portion and a drive portion. The centering portion is received in a receiving portion of the drive and the drive portion is received in the drive so that rotation of the spindle causes the socket drive to concentrically rotate the driver. The valve seat finishing tool is threadably secured to the driver. The non-dressable super abrasive provides a lapped finish to the valve seat.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present disclosure is related to internal combustion engines. More particularly, the present disclosure is related to devices for finishing the surface of valve seats in such internal combustion engines.[0003]2. Description of Related Art[0004]Internal combustion engines include an intake valve assembly and an exhaust valve assembly. During operation of the engine, the valve assemblies allow air-fuel mixtures and combustion by-products to selectively enter and exit the combustion chamber of the engine in a known manner.[0005]The valve assemblies include a poppet valve received in the cylinder head of the internal combustion engine. The poppet valve has a sealing face and a valve stem. The cylinder head includes a valve seat and a valve guide. The valve stem is slideably received in the valve guide so that the sealing face can selectively seal against and unseal from the valve seat.[0006]In internal combustion engine...

AI Technical Summary

Benefits of technology

[0013]In some embodiments, the valve seat finishing device includes a ball driver and a valve seat finishing tool threadably secured to the ball driver. The ball driver has a centering surface and a drive pin. The centering surface is received in a receiving surface of the socket drive and the drive pin received in a drive pin slot of the socket drive so that rotation of the spindle causes the socket drive to concentrically rotate the ball driver. The valve seat finishing tool provides a lapped finish to the valve seat.

[0014]In other embodiments, the valve seat finishing device includes a cone driver and a valve seat finishing tool threadably secured to the cone driver. The cone driver has a cone-shaped surface and a key. The cone-shaped surface is received in a receiving surface of the tapered drive and the key is received in a keyway of the tapered drive so that rotation of the spindle causes the tapered drive to concentrically rotate the cone driver. The valve seat finishing tool provides a lapped finish to the valve seat.

Problems solved by technology

However, machining and / or grinding operations on the valve seat are made difficult by the size and weight of the cylinder head.

Unfortunately, the machining and / or grinding operation alone usually does not provide sufficient surface finish to the valve seat.

Thus, after machining and / or grinding the valve seats, it is required that the valve seat be manually finished to the desired surface finish, which requires removal of the cylinder head from the machine and, thus, increases the cost and time associated with such repairs.

Moreover, the machine tools used in such machine operations require frequent re-sharpening, while the grinding tools used in such grinding operations require frequent re-dressing.

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