US1891460A - Method of and means for renewing valve seats - Google Patents

Description

Dec. 20, c D VLAHEK METHOD OF AND MEANS FOR RENEWING VALVE SEATS Filed Aug. 9. 1929 Anne/wrea- C. 0. l/LAHEK.

QTTOENEY.

Patented Dec. 20, 1932 PATENT OFFICE CHARLES D. VLAHEK, EAST ST. LOUIS, ILLINOIS man or am) mums FOR ammwme'vnvr: sears Application filed August 9, 1928. Serial No. 884,737.

This invention relates to valve seats and ing the valve seat and aportion of the valve methods of making the same, and more spe cifically to the renewing ofworn valve seats in internal combustion engines.

In large internal combustion engines, such as are used in trucks, buses, etc., the valve seats are subject to intense wear, and in the course of time the valve seats will no longer perform their function. Itis then necessary. to renew the worn valve seats. This is usually done by removing the cylinder head containing the worn valve seats and substituting a new cylinder head with its new valve seats. This practice, however, is extremely expensive, and as a result various attempts have been made to replace the worn valve seats with new valve seats. However, prior to this invention these attempts have not proved entirely successful because the new valve seats were not properly held in place.- The strain on the valve seats is so intense that the new valve seats would be jarred out of place and in some cases cause serious damage by falling into the moving parts of the engine. Consequently the expensive ractice of replacing the cylinder block, the ead, or at least the valve chamber, has been regarded as the only safe method.

The main object of this invention is to re lace a worn valve seat with a simple and .re atively inexpensive new valve seat which is securely and positively held in lace, so that it will not be loosened during t eoper; ation of the engine.

With the foregoing and other object's'in' view, the invention comprises the novel method, construction, combination. and arrangement of parts hereinafter more specifically 4 described and illustrated in the accom anying drawing, wherein is shownthe re erred embodiment of the invention.

owever, it is to be understoodjthat the invention comprehends changes, variatiorfs and modifications which come withinthe 'scope of the claims hereunto appended.-

Fig. 1 is a section illustrating a-portion of ;an internal combustion engine equipped with a valve seat embodying t e features of this invention.

Fig. atop view on a larger scale showchamber. I

Fig. 3 is an enlarged section taken on the line 33 in Fig. 2.

Fig. 4 is a top view of the valve seat.

Fig. 5 is a top view of the locking member which secures the valve seat.

1 designates the valve chamber of an internal combustion engine. The valve stem 2 'is located in a guide 3 and the head 4 of the valve is adapted to rest on a. valve seat member 5 which has a face 6 to receive the head 4.

The valve chamber 1 is provided with a I circular recess providing a circular wall 7 and an abutment shoulder 8. The valve seat member 5 is in the form of a ring seated up n the abutment shoulder 8 and has its perip eral face 9 in' frictional engagement with the circular wall 7 of the recess. The peripheral face of the valve-seat memberand the,

circular wall .7 of the recess are provided with annular grooves 10 and 11 which register with each other and have substantiallyflat parallel upper and lower walls. A flexible locking member 12 in the form of a spring ring having substantially flat upper and lower faces is located in the grooves 10 and 11 to secure the valve seat 5 in the recess. This ring is cut transversely to rovide the separated ends shown in Fig. 5. ince the valve seat member 5 contacts with abutment shoulder 8, the shocks resultthe locking means in the valve chamber will .now be described. -The worn valve seat (not shown) is removed to form a circular recess. This may be accomplished by boring out the'old valve seat.

The annular groove 11 is then formed in the circular wall of the recess.-- The valve seat member 5 is formed in the shape of a ring to conform to the recess, and the annular groove 10 is formed in the peripheral face of the valve seat member.

The portion of the valve chamber surrounding the circular recess is heated to expand the metal and thus enlarge the recess.'

The valve chamber is preferably heated by steam because there is no danger of overheating the metal of the valve chamber when steam at its ordinary temperature is used for this purpose.

The'spring ring is placed in the annular groove 10 in the peripheral face of the valve seat, and contracted to be entirely within the annular groove. The valve seat while relatively cold with the contracted spring ring is then located in the recess, and the spring ring will expand when it registers with the annular groove 11 so that it will be locked in both of the annular grooves. The valve seat will then be securely held in place.

I claim:

1. The method of renewing a worn valve seat in a valve chamber which comprises forming a recess in the valve chamber at the worn valve seat, heating that portion of the valve chamber surrounding said recess, with steam at substantially its ordinary temperature, placing a relatively cold valve seat in said recess, and at the same time locatinga yieldable locking member between the wall of said recess and said valve seat to secure said valve seat in said recess.

2. The method of renewing a worn valve seat in a valve chamber which comprises removing the worn valve seat to form a circular recess, forming a valve seat in the shape of a ring, forming annular grooves in the circular wall of said recess and in the peripheral face of said valve seat, locating a spring ring in the annular groove in said valve seat, heating that portion of the valvechamber surrounding the circular recess with steam at substantially its ordinary temperature, and placing the valve seat, while relatively cold, with the spring ring in said recess'so that the spring ring is locked in said annular grooves.

3'. A valve chamber having a circular re cess, a valve seat in the form of a ring having its peripheral face in frictional engagement ,with the circular wall of said recess, said peripheral face and circular wall being provided with annular grooves registering with each other and having substantially flat parallel upper and lower walls, and a spring ring located in said grooves to secure the valve seat in said recess, said spring ring having substantially flat upper and .lower faces in contact with the respective flat upper and lower walls of said annular grooves.

In testimony that I claim the foregoing I hereunto aifix my signature.

CHARLES D; VLAHEK.

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