US1489381A

US1489381A - Bevel-wheel shaper

Info

Publication number: US1489381A
Application number: US395417A
Authority: US
Inventors: Barth Curt
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-07-10
Filing date: 1920-07-10
Publication date: 1924-04-08
Anticipated expiration: 1941-04-08

Description

April 8, 1924.

- c; BARTH BEVEL WHEEL sHAPER 6 Sheets-Sheet l Filed July 10 V1920 6 Sheets-Sheet 2 Filed July 10 1920 pril 8 1924.

April s, 1924.

C. BARTH BEVEL WHEEL SHAPER 1o e sheets-sheet 's Aprils, 1924.l

cz.v BARTH BEVEL WHEEL sHAPsn Filed' July' 1o In ff 7))62 jm a@ `(-3 Sheets-Sheet 4.

April 8 1924.

c. BARTH BEVEL WHEEL SHAPER Filed- July 10 1920 6 Sheets-Sheet 5 LEA /5 EMM,

April 8 1924.

e sheets-sheet 6l C BARTH BEVEL WHEEL SHAPER Filed July 10 MHZ f2 Patented pr. 8, 1924.

UNITED STATES CURT BARTH, OF HAMBURG, GERMANY.

BEVEL-WI-IEEL SHAPER.

Application filed July` 10, 1920. Serial No. 395,417.

(GRANTED UNDER THE PROVISIONS F THE ACT 0F MARCH 3, 1921, 4l STAT. L., 1313.)

To all whom t may concern:

Be it known that I, Dr. CURT BARTH, a citizen of the German State, residing at Hamburg, Germany, Klostertor 8, have invented certain new and useful Improvements in or Relating to Bevel-Wheel Shapers (for which I have filed applications in Germany, B 87,501 I/49b, filed'Sept. 27, 1918, Patent No. 344,991, and Germany,

88,668, filed March 5, 1919), of which the following is a specification.

This invention relates to machines for shaping bevel gear wheels of the type operating on the generating principle, in which both the cutting tool and the wheel blank are rotated. In machines of this type, the

mutual rotation of the tool and work is` produced by either the motion of the tool being initiated by the main drive and the motion of the work heilig then derived from the motion of the tool, or vice versa. Now,

for the purpose of deriving the second motionl from the first, there has been devised heretofore special gearing mechanisms constituting a. yparticular feature of the respective commercial machine, as for example, the band of ythe Bilgram bevel gear Shaper and the oscillating strap of the Gleason bevel gear Shaper.

It has previously been proposed to derive both the motion of the .tool and' also that of the work directly from the main drive shaft or mechanism, a kdhange-speed gear being employed for the change of the gear ratios. But, such change-speed gears have,

however, been located at such a point in the driving train that the rotation of the wheel blank and of the tool couldY not be 'affected independently by the one from the 40 other, so that in ysuch machines the opera` tion of effecting the proper ratio between the rotations of the respective parts is a very dilicult and complicated one.

The movement ofthe blank and the movement of the tool must be modified from different points of view; the former movement depends on the number of teeth and the latter on the shape of a tooth section. Consequently it will generallyebe necessary to modify both movements during adjustment for a given blank, since bo-th t-he number of teeth and their shape change.

Now, according to the present invention two separate and distinct change-speed gears are provided, one arranged between the main drive and the tool 4and the other betweenthe main drive and the wheel blank, so that the speed of rotation ofthe tool may be varied independently of the speed of the blank or vice versa. The provision of this double changespeed gear renders it posnow made use of, in accordance with the present invention, in connection with bevel wheel shapers of the type in which both the cutting tool and the wheel blank are rotated.. A further feature of t-he invention consists, therefore, in adapting the tools to beset transversely to the direction in which they are toI work for the purpose of producing skew bevel gear wheels. p

Two embodiments of my invention are shown, by way of example, in the accompanying drawings, in which- Figure 1 shows a cross section through t-he machine, taken on line 1-1 of Fig. 2,

Eig. 1a is a similar cross section, the lower half being a side view of the machine,

Fig. 2 is a section taken on Ithe line 2 2 of Fig. 1,

Fig. 3 is a` plan view partly in section of the. machine shown in Fig. 1,

Fig. 4 illustrates a modified form of construction and is a longitudinal section of a machine,

Fig. 5 is a view looking to the left in the direction of the tool rest of the parts shown in Fig. 4, the lower tool post being omitted, and

- Fig. 6 is a top view of the parts shown in Fig. 5.. i

The kdriving shaft 2 together with the driving pulley4 3 are mounted in the frame 1 of the machine. Rigidly mounted on said shaft 2 is a gear wheel 4. LAn additional shaft 5 is co-axially disposed with shaft 2, this shaft 5 being mounted at one end in the frame, and at the other end in the shaft l other gear -10 is mounted.

' two shiftable clutch members 6 and 7 slidable on, but not rotatable-with respect to, the said sleeve 8. .lilhen the clutch 6 is brought into engagement with 'a corre-r sponding clutch portion a" operatively connected with the gear wheel 4, shaft 2 and sleeve 8 will be directly coupled for high speed, and by closing the coupling 7 there will be effected a connection between the sleeve 8 and a clutch member 9 fixed to the shaft 5. This latter drives, by means of shaft 5, a gear 10 meshing with a gear 10L on an intermediate shaft 10b on which an- This gear 10 meshes with a gear 100 ou a second intermediate shaft 5a. Both intermediate shafts are journaled in the fra-me 1 parallel to the

shafts

2 and 5. On the shaft 5 there is fixed a second gear la meshing with the gear wheel a for the purpose of driving the shaft 5 by means of theV main shaft 2, when members 7 and 9 are coupled.

`The clutch members G and 7 are engaged, in known manner, by clutch arms not shown on the drawings and adapted to be commonly operated.

A gear wheel 11, which is keyed on the sleeve 8, meshes with gear wheel 12 mounted on a sleeve 98 rotatably arranged on shaft 13.

The sleeve 98 has a clutch member 117 axially rmovably, but not rotatably mounted thereon, said clutch being adapted to engage the hub 111 of a gear controlling an automatic shifting device not shown but of known construction.

The shaft 13 has a spur Wheel 14C fixed to one of its ends by means of which, with therinterposition of change speed wheels 15 the worm 1G is driven. The said worm gears with a wheel 17 which is rigi ily connected to the face plate 18. This latter carriesV the adjustable planing tools, of

known construction, disposed in tool posts 19. These posts possess a reciprocatory motion, and are driven by a rack gear 13 and a crank 20, the motion of which latter may be derived from the mam drive,'as instance a toothed wheel 80, bevel gear 81, f 82 crank 83 and connecting link 84. (Fig.

3). rlhe work is attached to a face plate or a chuck 21 mounted on a shaft 22. This latter obtains its rotation by the intervention of a worm gear 23 and bevel gears 2a from a shaft 25. The latter is connected by means of three spur wheels 26, 26a, 26b to a spindle 27 on which there is mounted a bevel wheel`28 which is adapted to engage a longitudinal bevel wheel 29 meshing with a bevel wheel 30 co-axially arranged and fixed on the same axle 30a with a toothed wheel 31. rlhis wheel is connected by means if he chuck is mounted on a bearing 33 which is adapted to be rotated around the centre of the machine traversing the axis of the bevel wheel 29. Each. time the machine is set the bearing must be rotated Vso that the pitch cone of the tooth to be cut contacts with the pitch plane of therface plate 18.

'lf he operation of the machine, the parts being` in the position in which the clutch members 7 and 9 and the clutch members 117 and 111 are in engagement with each other, respectively, is as follows:

Ey means of driving pulley 3 and by intewention of the gears 4 and f1, shaft 5a, gears 1 O and 10', shaft 10b, gears 10a and 10, shaft 5, gears 11 and 12, shaft 13, gears 14 and 15, worm 1G and worm wheel 17, the face plate 18 carrying the planing tools and by intervention of the gears 4c and 4a, shaft 5, gears 100 andlO, shaft 10", gears 10a and 10, shaft 5, gears 11 and SI1, shaft 93, change speed gears 32, gear 31, bevel gears 30, 29 and 28, spindle 27, spur wheels 26, 26EL and 26", shaft 25, bevel gears 24, worm gear 23 and shaft 22, the chuck 21 carrying the work piece are caused to `be rotatedV simultaneously. By the interposition of

suitable change wheels

32 and 15,

respectively, this rotation will be in conrocating motion carried out by the tool posts 19 supporting the planing tools. The machining operation is continued until the tooth about to be cnt has completely generated from the tooth formed by the planing tools. As soon as the shaping operation has been completed the automatic shifting de vice mentioned above moves the clutch members 6 and 7 2) to the right hand side, hereby constituting a direct connection of

shaft

2 and 5 by means of the clutch 6 and reversingthe machine for the quick return.

In a similar manne-r, when the quick'return.

comes to an end the automatic shifting device causes the movement of clutch members 6 and 7 to the `left hand'side. ln this way couplings 7 and 9 are again engaged and couplings d and 6 are disengaged. In this way the automatic working of the ma- Y chine i" `oerformed.

Y wheel 12.

While the rotating movement of the tools -has been interrupted, the shitting or feeding is performed, the speed change wheels 32 being so adjusted, that one revolution of wheel 12 corresponds t-o the movement of the work piece for one tooth space.

In the embodiment shown in Figs.' 4 to 6, and relating to the application of the subject matter of this invention to a process of manufacturing screw bevel wheels, the numeral 21, described with respect to Figs. 1 to 3, denotes the chuck in which the work to be machined is fixed. Opposite this chuck is disposed the face plate, which, however, consists of two parts. On the worm wheel 17, driven by the worm 16 there is rigidly mounted a guide plate 38 provided with a dovetailed guide, along which the portion 34 of the face plate supporting the tool posts 19 for the planing tools is adapted to be adjusted. The conjoint displacement of the plate portion 34 with the tool posts 19 is effected by means of a screw 35 mounted to rotate in the part 33 and providedwith a nut fixed to the part 34. Set screws 3G, adapted to bear against a spacing wedge 3T, serve to secure the said parts in their position.

By means of the described device it is possible to displace the two tool posts 19 supporting the shaping tools relatively to the face plate so that, during the mutual generating action effected by the face plate and the work, the tools will be prevented from describinga path in the direction toward the center of the wheel, but will describe a path tangential toan imaginary circle drawn from the center of the said wheel, thus producing screw bevel wheels.

In order to secure the eccentric adjustment of part 34 with the shaping tools, the drive is effected from the toothed wheel 38, driven by the main shaft, across a toothed wheel 39 and the shaft 40 to a toothed wheel 41 which latter meshes with tfhe tooth Wheels 43. In order to enable the toothed wheel 41 to engage with the toothed wheel 43, even when part 34 which carries the tool posts 19 is shifted, the shaft 40 which connects the toothed wheel 41 with the toothed wheel 39 is movable. The said shaft is provided with two universal joints 44, and is divided, one part engaging with the other by means of a pin 45, which enables a longitudinal movement of the two parts of the shaft but not a reciprocal movement.

The drive hereinbefore described enibodies the special advantage over and above that disclosed in connection with Figs. 1 to 3, in that the oscillating movement required for the reciprocating motion of the cutting tools is only effected directly on their supporting post while up to that point there prevails merely a rotary motion, so that the machine will be able to work free from all shocks.

I claim as my invention:

1. In a machine for shaping bevel wheels of the type described, the combination of a rotating chuck for t-he work piece; a rotating face plate; reciprocating tools supported by said face plate; a main drive from which the rotation of said chuck and face plate is derived; and two separate change-speed gear trains, the one of which being arranged between the main drive and the rotating chuck and the other being arranged between the main drive and the rotating face plate.

2. In a machine for sha-ping bevel wheels of the type described, in combination a rotating chuck for the work piece; a rotating face-plate; reciprocating tools, supported by said face plate; a main drive from which the rotation of the chuck and face plate is derived; and two separate change-speed gear trains, the one of which being arranged between the main drive and the rotating chuck and the other between the main drive and the rotating face plate, the two gear trains being adjustable independently the one from the other.

3. In a machine for shaping bevel wheels of the type described, in combination a rotating chuck for the work piece; reciprocating cutting tools; a face plate: supporting said tools; a main drive; two separate gear trains connecting said main drive with the chuck and face plate respectively; and means for adjusting said cutting tools transversely to the direction in which they are to work for the purpose specified.

4. In a. machine for shaping bevel wheels of the type described, in combination a rotating chuck for the work piece; reciprocating cutting tools; a face plate supporting said tools; a main drive; and two separate gear trains connecting said main drive with the chuck and face plate respectively; said face plate being divided into two parts the one of said parts which is adapted to carry the tools being adjustable with respect to the other part which is connected to the Vdrive to permit the adjustment of said tools transversely to the direction in which they are to work.

5. In a machine for shaping bevel wheels of the type described, in combination a rotating chuck for the work piece; reciprocating tool posts; a face plate supporting said tool posts; a main drive; and two separate gear trains connecting said main drive with the chuck and the face plate respectively, the gearing connecting the main drive with the face plate consisting of a reciprocating part immediately connected to the said tool posts and a revolving part connecting the said reciprocating part to the main drive.

6. In a machine for shaping bevel wheels of the type described, in combination a rotating chuck for the Work piece; reciprocating tool posts; a face plate supporting said tool posts and being divided into tWo parts the one carrying the tool parts being adgustable with respect to the other; a main drive;

a gear train connecting said niain drive with the chuck; a second gear train connecting the inain drive With the face plate, and coinprisiug a reciprocating part immediately connected to the said tool posts and a revolving part connecting the Said reciprocat-v ing part to the main drive and means Whereby rotary movement may be transmitted to the cutting tools at any adjusted position of said face plate parts.

'7. In machine for shaping bevel Wheels of tlie type described, the combination of a rotating chuck for the Work piece; a. rotating tool carrying element; a c oninion drive for said chuck and element; and means whereby the chuck may be angularly adjusted with relation to the tool carrying element.

In testimony whereof l have affixed my signature.

DR, oUR'r BARTH.