US520995A - Machine for finishing gears - Google Patents

Description

;No Model.) y 2 Sheets-Sheet 1.

J. L. KUNZ. MACHINE IE'OR FINISHING GEARS.

No. 520,995.. Patented Julie 5,1894.

2 Sheets--Sheet 2.

(No Model.)

J. L. KUNZ. MACHINE FOR FINISHING GEARS.

Patented June. 5, 1894.

l l/i In E55 55, (SW gm U IT D STATES PATENT OFFICE.

JOHN L. KUNZ, OF MILWAUKEE, WISCONSIN.

MACHINE FOR FINISHING GEARS.

SPECIFICATION forming part of Letters lPatont No. 520,995, dated June 5, 189%.

Application filed August 21, 1893. Serial No. 483,595. (No model.)

To all whom it may concern:

Be it known that 1, JOHN L. KUNZ, a citizen of the United States, residing at Milwaukee, county of Milwaukee, State of Wisconsin, have invented a certain new and useful Improvement in Machines for Finishing Gears; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which forma part of this specification.

My invention relates to an improved method of cutting the teeth on gear wheels, and also to an improved machine for use in carrying out my improved method.

The object of my invention is to provide suitable means whereby all the teeth upon a gear wheel may be cut simultaneously.

In the accompanying drawings illustrating my invention, Figure 1 is a side elevation of my improved gearcutting machine. Fig. 2 is a horizontal sectional view of the same taken on line 22 of Fig. 1. Fig. 3 is a vertical sectional view of the same taken on line 3-3 of Fig. 1. Fig. 4: is a horizontal sectional view taken on line 4 4. of Fig. 3. Fig. 5 is a vertical sectional view illustrating a somewhat difierent form of construction of die holding device. Fig. 6 is a sectional view of the valve for governing the operation of the machine. 1

Referring by letter tosaid drawings, A designates a suitable base, which is conveniently made in the form of a suitable cylinder for the reception of water. A piston B is fitted within the cylinder A and is arranged to reciprocate vertically therein, said piston carrying at its upper end a suitable table B. Adjacent to the sides of the table B are arranged any desired number of guides O O, which are arranged to engage in any desired manner with the said table, so as to guide it in its vertical movement up or down.

' A socket D is formed centrally in the table B for the reception of an arbor or spindle d, in the manner shown more particularly in Fig. 3. This arbor or spindle is arranged to support the rough casting of a gear wheel, while the operation of finishing the teeth thereon is being performed.

In the particular form of construction illustrated in Figs. 1, 3 and 4 of the drawings, the

device for shaping the outsideof the gear, carried at the upper end of the frame, comprises a suitable casting'F whichis approximately of the same shape as the die proper F, and to which said die is secured, in any desired manner, as by means of screws or bolts f f. i

In the operation of cutting or finishing the teeth of gear wheels by myimproved method, the rough casting G of the gear wheel is arranged upon the arboror spindle d, in the manner illustrated in the drawings, being preferably arranged upon the upper side of a supporting block G, which is preferably of the same external contour as the finished gear, and is arranged upon the table B in such position as to register with the die F in. the head block, so that by a vertical upward movement of the piston and the table, the said supporting block G will pass into mesh with the die F. In adjusting the casting G of the gear in position upon the supporting block G, the said casting is arranged with its teeth in register with the teeth of said supporting block, and it follows that by the described upward movement of the table, the

casting being thereby shaped so as to conform to the teeth in the die.

Water isintroduced into the cylinder in base A, through a suitable pipe H which leads to a force pump and is controlled by a valve H by means of which the supply ofwate'r may be shut off, when themov'ement of the piston has progressed to the desired point, so

as tocarry the gear entirely through the die.

A second pipe I communicates with the interior of the cylinder, and is arranged to carry when the table B has reached a predetermined level, when the piston, the table carried thereby and the work upon the table will be permitted to descend by gravity.

In order to eifect the stoppage of the piston and the parts carried thereby automatically, I find it convenient to employ an upwardly extending rod J, which is operatively connected with the lever h upon the stem of the valve H, upon which rod is arranged an adjustable collar j adapted for engagement with a shoulder J upon the table 13', whereby the rod J maybe operated to adjust the valve H to cut oif the supply of water at the instant when the vertical movement of the piston has carried the gear entirely through the die. As a matter of convenience I prefer to construct the valve H in the form of a three-way valve, the arrangement being such that when the lever h is actuated to cut off the supply of water, the water from the pump will be permitted to discharge through a relief pipe h, and the operation of the machine thereby automatically stopped without the necessity of stopping the motion of the pump. By the adjustable arrangement of the collar j upon the rod J, said collar maybe placed at a point upon said rod necessary to stop the movement of the machine at any desired level.

As a further and separate improvement, I prefer to arrange a suitable lever t' 011 the stem of the valve 1 and to connect the lower end of arod K with said lever and to provide, upon said rod a collar is, adapted for engagement with a shoulder or stop L, upon the table B at the instant when the table has reached the limit of its upward movement, so as to instantly open the valve 1 for the escape of the water from the cylinder. This collar is conveniently made adjustable in the same manner as the collarj. If desired, also, a second collark may be arranged upon the rod K, in such a manner as to be engaged by a shoulder or stop L upon the table so as to automatically close the valve 1 when the limit of the downward movement of the table is reached, so as to prevent the escape of water from the cylinder.

In the particular form of construction illustrated in Figs. 3 and 4 of the drawings, the die F is shown as of the same diameter upon its outside as the supporting block F, to which it is secured, and simply fastened to the lower face of said supporting block by screws or bolts f f, the block F being also held in engagement with the head blockE by means of the same bolts or screws. In some cases, however, it may be preferable to form the supporting block for the die in the form shown in Fig. 5 in which a casting M is provided upon its upper side with a central stud m, adapted to pass through a central aperture e in the head block E, and screw-threaded at its upper end as at m for engagement with a retaining nut. The lower side of this casting M is recessed as at M and provided with internal teeth in like manner to the block F, and is counterbored as at m for the reception of the die N. By this construction, the die and its support may be readily placed in position in the head block by inserting the stud m in the aperture e, and securing the same by a suitable nut. The recess M is of sufficient depth to permit the gear to pass bodily through the die N as the cutting operation is performed. By the insertion of the die into the annular opening in the lower side of the supporting block M, a very firm support is afforded for the die against lateral strain, and said die may therefore be made much lighter than would be practicable if it were unsupported against such lateral strain.

In the usual methods of cutting gear teeth, the teeth are finished separately, and the operation is necessarily rendered slow and todious, by reason of the necessity of the frequent adjustment of the gear during the pro cess of cutting the teeth, while by my improvement I am enabled to out or finish all of the teeth upon a gear wheel simultaneously, at a given stroke or movement of the piston. I am therefore enabled to provide a machine for this class of work having a much greater capacity for work than any of the ordinary types of gear cutting machines.

My improved machine is of much simpler construction, and is much cheaper to manufacture, than any of the usual forms of gear cutting machines.

By the employment of hydraulic power for actuating the machine, all the pressure necessary to cut all of the teeth simultaneously in any desired size of gear wheel may be obtained.

It will be observed that with the particular arrangement of parts illustrated in the drawin gs and herein described, the induction valve will remain closed after the piston has been returned to its initial position, so that in order to again startthe machine it becomes necessary for the operator to elevate the rod J so as to open the induction valve for the admis sion of water to the cylinder. If desired, any suitable device might be employed for enabling the operator to adjust the rod, al though said adjustment may be readily effected by the operator directly grasping the rod and moving the same longitudinally, and it is not deemed necessary to illustrate such operating device in the drawings, as the same forms no essential part of my present invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is-

A machine for cutting or finishing the teeth upon gear wheels comprising a suitable base,

a plunger movably engaged therewith, and

carrying a supporting table for the rough casting or blank of a gear, a head block opposed to said plunger, a die shaped upon its inside to conform to the outside of the finished gear, and supported in said head block finish all of the teeth, substantially as de- 10 scribed.

p In testimony whereof I sign this specification in the presence of two witnesses.

JOHN L. KUNZ.

Witnesses:

JOHN E. WILES, E. W. STOUT.

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