US2014625A - Pumping power - Google Patents

Description

Patented Sept. 17, 1935 PATENT OFFICE PUMPING POWER fCharles McLane, Lufkin, Tex, assignor to Lufkin' Foundry & Machine Company, Lufkin, Tex., a

corporation Application August 13, 1932, Serial No. 628,653

4 Claims.

The invention relates to an improvement in a mechanism known as a pumping power which is used in connection with the production of oil from wells. 1

The present invention is in the nature of an improvement over the structure disclosed in application Serial No. 314,117, filed October 22, 1928, by Walter C. Trout.

It is one of the objects of the invention to provide a, pumping power wherein there is great stability obtained for the eccentric stresses that are applied to the machine.

Another object of the invention is to construct a pumping power wherein all of the gearing is enclosed in an oil bath and wherein the gearing is rigidly supported by an extended stub shaft carried by the housing of the machine.

Another object of the invention is to provide in combination with a pumping power an insertable stub shaft which is adapted to extend beyond the normal base of the pumping power so that the shaft will be sufficiently braced to withstand the bending stresses applied thereto.

Another object of the invention is to provide a cantilever construction for the stub shaft in oil well pumping powers.

Other and further objects of the invention will be readily apparent when the following description is considered in connection with the accompanying drawing wherein Fig. 1 is a central vertical sectional View of a pumping power constructed in accordance with the invention.

Fig. 2 is a top plan view of the pumping power shown in Fig. 1.

The general construction of the entire machine is similar to that shown in my co-pending application hereinabove referred to and includes the housing 2, which includes the base portion 3, the

sides 4, and the top or cover 5. These parts in combination with the crank table 6 make a completely closed housing which is adapted to retain a quantity of lubricating material in which the main drive gear 8 is arranged for rotation. The power will be applied to the machine by means of a drive wheel 9, which is best seen in Fig. 2. This drive wheel serves to rotate the worm shaft II, which is mounted in suitable bearings in the portion [2 of the housing 2. The shaft II has teeth formed thereon which mesh with the teeth !3 on the periphery of the drive wheel 8.

In this manner the drive wheel Bis caused to rotate and causes an eccentric movement to the crank arm l5, which is formed integral with or is carried by the crank table 6. r A suitable concentric wheel i6 is mounted on the crank arm I by means of the bearings I'l, so that the same may be carried around with the crank I 5. A plurality of openings !8 are formed in the wheel Hi to receive the rod or cable connections to the wells which 5iv are to be pumped.

It is to be understood that there may be one or more of the wheels I6 mounted on the crank table 6, one being shown in the present drawing,

whereas two are illustrated in my co-pending 10- application.

The crank table 6 is attached to the top of thedrive gear Bby means of the bolts 20. The crank table 6 serves to close the cover 5 of the housing and the packing 2| makes a leak-proof seal at the edge of the crank table so that the lubricant from within the housing can not escape and. dust and dirt from the exterior of the housing can not contaminate the lubricant.

One of the features of novelty of the present invention is the particular mounting of the stub shaft indicated generally in Fig. l at 25. This shaft is subjected to enormous bending moments due to the stresses applied to the crank wheels I6 in event the wells are not evenly balanced in their connection to the pumping power. With this in mind the shaft 25 has been changed from its general construction shown in my copending application and now embodies the lower or cantilever portion 26, which is formed integral with the upper or gear supporting portion 21.

The shaft 25 is shown as hollow and provided with a plurality of internal ribs 31, which eliminates excessive weight in the shaft and at the same time provides sufficient strength to withstand the bending moments. 7

Intermediate the ends of the shaft 25 is shown a holddown portion 28, in the form of a flange. This flange is arranged to seat in the depression 29 in the base 3 of the housing 2 and is held in position by suitable cap screws or bolts 30. The lower portion 26 of the shaft is of particular importance because it serves to withstand the bending moments applied to the portion 21 of the shaft, and in this manner takes an enormous strain from the base 3 of the housing. In order to properly support the lower portion 26 of the shaft 25 so that it will withstand the stresses, a

dation member by which it is connected to the housing 2.

Spaced radially of the well 34 are the braces or webs 36, which serve to absorb the stresses applied to the end by the lower portion of the stub shaft.

It will be readily apparent that from the foregoing description a cantilever construction has been provided in connection with the stub shaft so that the stresses will be evenly distributed. There will be no breakage of the parts and the service obtainable from the power is materially extended because there is no whipping or vibra-' tion of the parts as they operate and this, in turn, eliminates excessive stresses to the various parts of the machine. While a flange on the shaft has been shown as a hold down, it is contemplated that other structures may be used if desired.

What is claimed is:

1. An oil bath pumping power including a housing, an opening in the base of said housing, a gear support shaft positioned to extend through said opening, a flange on said shaft to seat inside of the opening in said housing to support the shaft, and a cap to fit the bottom of said base to enclose the lower end of the shaft projecting through the opening, and means to fix said flange and cap to the base to hold said shaft in aligned position.

2. An oil bath pumping power including a housing, an opening in the base of said housing, a gear support shaft positioned to extend through said opening, a flange on said shaft to seat inside of the opening in said housing to support the shaft, and a cap to fit the bottom of said base to enclose the lower end of the shaft projecting through the opening, means to flx said flange and cap to the base to hold said shaft in aligned position, and a gear rotatable on said shaft so that the shaft is the only support therefor.

3. An enclosed pumping power including in combination a housing, a stationary shaft projecting through the base of said housing, a rotatable gear on said shaft, means on said gear to cooperate with said housing to form an oil bath chamber for said gear, and to carry an eccentric load, and means to fix said shaft to said housing to resist the lateral stresses of the eccentric load applied to said shaft and gear including a flange fixed on the shaft and on the base of the housing, and a cap below the base of the housing to form a bearing for the projecting end of said shaft.

4. An enclosed pumping power including in combination a housing, a stationary shaft projecting through the base of said housing, a rotatable gear on said shaft, means on said gear to cooperate with said housing to form an oil bath chamber for said gear, and to carry an eccentric load, and means to fix said shaft to said housing to resist the lateral stresses of the eccentric load applied to said shaft and gear including a flange fixed on the shaft and on the base of the housing, and a cap below the base of the housing to form a bearing for the projecting end of said shaft, said shaft being hollow and formed with internal ribs to resist bending.

CHARLES McLANE.

Images