USRE15013E - saurefi - Google Patents

Description

. H. SAURER. I APPARATUS FOR TESTING THE TEETH OF GEAR WHEELS. APPLICATION FILED APR. 10, 1920.

Reissud Dec. 21, 1920.

' 2 SHEETSSHEET I.

H. SAURER.

APPARATUS FOR TESTING THE TEETH 0F GEAR WHEELS.

APPLICATION FILED APR. 10, I920.

Reissued Dec. 21, 1920. i 1 5 ,0 1 3 2 SHEETS-SHEET 2- sirable results.

UNITED STATES PATENTTLTIOFFICEE.

HIIPPOIiYT SAURER, OF ARIBON, SWITZERLAND.

APPARATUS FOR TESTING THE TEETH GEAR-WHEELS.

' To all whom may concern Be it known that I, HIPPOLYT SAURER, a cltizen of Switzerland, residing at Arbon,

Switzerland, have invented new and useful Improvements in Apparatus for Testing the Teeth of Gear-Wheels, of which the followin is a specification.

yinvention relates to improvements. in apparatus for testing the teeth of gear wheels whereby the inaccuracies of the working faces of the teeth are indicated. If the teeth of one or both of a pair of intermeshing gears be inaccurately formed, one of the pair, for instance the driving gear, may be turned at any desired speed while the other, namely the driven gear, will have an irregular or jerky movement including successive accelerations and retardations in respect to the speed of the driving gear, as successive teeth come into or pass out of mesh. These comparatively slight speed variations of the driven gear above and be low the mean or average speed determined 'by the speed of the driving gear and the relative pitch diameters. cause noise, excess sive wear, frlction losses and other; unde- The object of my invention is to provide an apparatus in which commercially made pairs of gears of various different sizes and relative pitch diameters may be inserted and tested and'the ordinarily comparatively I slight inaccuracies be clearly shown and recorded on a greatly enlarged scale.

In carrying out my invention I provide an indicating member, preferably in the form of a stylus or other recording member movable in respect to two separate axes, and control its movement by two coaxial rotatable controlling members having separate driving connections from the separate gearsto be tested. The driving mechanism includes interchangeable part or parts so designed that'the coaxial controlling members for the stylus may be rotated at approximately the same speed even though the gears being tested have different pitch diameters and therefore rotate at different speeds.- Thus for perfectly formed teeth the two members may rotate at approximately the same uniform speed and the stylus will move in respect to only one of its axes and trace a smooth curve. ariations in the relative rates of rotation of the gears due to gear teeth inaccuracies orother cause will eration and retardation Specification of Reissued Letters Patent. Reissued B a 21 1920 Original'No. 1,263,472, dated April 23, 1918, Serial No. 33,?06, filed June issue filed A ril 10, 1920. Serial No. 372,983.

12, 1915. Application for regive to the stylus a secondary movement about its other axis due to alternate accelof the driven gear and its stylus controller.

As a preferred embodiment and as an lmportant structural feature I mount the two coaxial stylus controlling members 00- axial with the support for oneof the gears to be tested. This. permits one to be rigidly connected to one gear support. Motion is transmitted to the other stylus controlling member from the other gear support by a suitable pair of disks, the diameters of which may be in the same ratio as, the diams eters of the'pitch circles of the gears to be tested.-. Preferably they have the same diaineters as said pitch circles and are mounted coaxial with the gears with their peripheries in frictional driving engagement, one disk beingrigid with its corresponding gear and stylus controller and the other disk being rigidlyconnected to the other stylus controlling member but loose in respect of the gear coaxial therewith. Thus as the, gears rotate, motion will bedirectly communicated to one stylus controlling member fromthe gear coaxial therewith and motion will be communicated to the other stylus controlling member. from the other gear. through the friction disks. Any tooth inaccuracy causing relative speed variation .of one of the gear wheels therefore causes an irregular, zig-zag or secondary movement o fthe stylus which may be easily noted and recorded.

For the purpose ofexplaining the invention an example embodying the same has been shown in the accompanying drawing, in which Figure 1 is a vertical cross-section of the apparatus with a pair of gear wheels mounted thereon. Fig. 2 is a side elevation partly in section, the recording mechanism eing omitted. Fig. 3 is a detail sectional view of the spindle bearing, and Fig. 4 is a view of a record made by the use of the ap aratus.

n theexample shown in the drawing my improved apparatus includes a pair of spindles, 1 and 2 which are mounted on a common frame .or bed 21 so as to be shiftable relative toward and from each other but preferably held against rotation. The particular means employed for effecting the relative adjustment of the spindles is comparatively unimportant but is shown as including slides 22, both of which are shiftable in a suitable guide-way 23 formed on the bed 21. The two spindles are carried by the two slides and the latter are adapted to be moved toward and away from each other by means of a screw threaded spindle 24 mounted in a bracket on the bed and having a crank 25.

I On the spindle 1 there is rotatably mountposed between these parts. Encirclmg the I I sleeve-1 is a second sleeve 11, the two sleeves being provided with an interposed ball bearingl 10. The two sleeves 3 and 11 constitute t I to be tested. I have shown apair of gears and at approximately the same speed as the,

6 and 9 detachabl secured to these sleeves, the two spindles eing adjusted in respect to each other so that the gears properly.

mesh. I

For rotating the sleeve 7 from the gear 6 sleeve 11 which carries the gear 9 I provide a pair of disks .5 and. 8. These are preferably friction disks having their petwo disks being removable an of the same pitch diameters as the gears to be tested and held co-axial with the gears. The disk 5 is shown as rigidly but detachably secured to the sleeve 3, while the disk 8 is shown as rigidly but detachablysecured 1to' the sleeve I I The two co-axial sleeves 7 and 11 constitute parts of or serve to carry two controling members for the indicating member. In

the specificv form illustrated the upper end of the sleeve 7 has a casing ri 'dly secured thereto and rotatable therewit The casing, adjacent to the peripheral wall thereof,

has a pivot bolt 14 parallel to the spindle 2 and serving asa pivot'f'or an arm 15 extending across the casing. This arm termis nates ina segment 16 provided with ear teeth meshing with a pinion 17 carried y a pivot member 28 mountedin the casing and.

also parallel to the spindle.- This pivot member has rigidly connected thereto an arm 18.carryin at its end a stylus 26 which serves as an in 'icating member, it being so mounted as to trace indications on a record blank 19.. This record blank is shown as non-rotatably'secured'to the upper end of the fixed spindle 2. To the upper end of the sleeve 11 there is keyed an arm 12'which I is provided at its outer end with 'a finger 13 engaging in the bifurcated part 27 of the arm 15 which projects-through a slot in the wall of the casing 20. I

The operation of he apparatus is as follows:

The pair of gear wheels 6 and 9 to be tested are'rigidly secured to the " sleeves 3 and 11. Friction disks 5 and 8 having the "6 and 9 will be in proper mesh. The

Rotatably wheel 6, its supporting sleeve 3 and the rice supports for the pair of gears the two co-axial sleeves -7 and 11.

same diameters as the pitch diameters of the ar wheels are secured to the sleeves 3- and 7. The spindles are then brought to the proper adjustment by means of the screw threaded spindle 24. The friction disks 5 and 8 will then be in direct driving engagement with each other and the gears e'ar tion disk 5 are then slowly rotated in any suitable manner as, for.instance, by hand.

- tion disk 8 are exactly alike and there is,

therefore, 110 relative rotary movement of The casing'2O and the arm 12 which control the movement, of the stylus rotate together and there is no relative. movement of the segment 16 and pinion 17, and the stylus follows a direct path and draws a circle on the of the ears are incorrect, the uniform rotation 0 the gear wheel 6 will, impart non- I uniform or irregular movements to the gear wheel 9. As t friction disk 8., sleeve 7 and casing 20 are rotatedby the gear 6, and the arm 12 is rotated by the gear 9, the non-uniform movement of the gear 9 in re- Spect to thegear 6 will cause slight relative rotary movements of the arm 12 and the casing 20 and, therefore, the stylus 26 will be caused to move not only in a circular.

patharound the spindle 2 but also in a curved path about the pivot member 28. Any slight accelerations and retardations of the gear 9 in respect to the gear 6 will cause oscillations or back and forth movev ments of the stylus. This oscillatory or back and forth movement of the stylus about the pivot member 28 will be recorded on the record blank 19 as a zig-zag line.

'In Fi 4 I have shown a record blank with such a zig-zag line thereon as may be produced by irregularity in the shape of I the .gear t'eeth faces. If the relative diameters of the disks and the" ears be exactly the same, the line, after a single rotation of the gear 9, willcome back to the starting point. If there be a very slight difference in the relative pitch diameters of the disks and the gears, the spiral willresult as shown in Fig. 4.

In descrlbing the invention referencgjilhas been made to an example in which'th'friction disks are mounted concentrically of the corresponding gear wheels. While I preferthis construction by reason of its sim-,

plicity and the exact operation, I wish it to be understood that mylinvention isnot lim-. I

ited to this feature, and that various record blank 19. ,If the said'working faces ripheries in directdriving en agement, the

I changes may be made in the general arrangement of the apparatus and the construction of its parts within the glst of my invention.

I claim herein as my invention:

1. In an apparatus for testing pairs ofgear wheels, the combination with a pair of supports for said gear wheels for rotation thereof in engagement with each other, of a pair of friction disks the diameters of which are of the same ratio as the diameters of the pitch lines of the gear wheels and adapted for correct driving engagement with each other and one connected with one of the gear wheels for rotation in harmony therewith and the other one loose relatively to the other gear wheel, means to shift one of said supports to bring disks of different size into driving enga ement, "and means to record the relative splacements of the disk and gear wheel which are loosely mounted relatively toeach other.

2. In an apparatus for testing pairs of gear wheels, the combination with a pair of supports for said gear wheels for rotation thereof in engagement with each other, of a pair of friction disks the diameters of which are respectively the same as those of the pitch lines of the gear wheels andadapted for correct driving engagement with each other and one connected with one of the gear wheels for rotation in harmony therewith and the other one loose relatively to the 1 other gear .wheel, means to shift one of said supports to bring disks of different size into drlvlng engagement, and means torecord the relative displacements of the, disk and gear wheel which are loosely mounted relatively to each other. v

3. In an apparatus for testing pairs of gear wheels, the combination with afpair of supports for said gear wheels for rotation thereof in engagement with each other, of a pair of friction disks the diameters of which are respectively the same as those of the pitch lines of the gear wheels and incorrect driving engagement with each other and mounted respectively coaxially of the corresponding gear wheels and one connected with one of the gear wheels for rotation in harmony therewith and the other one loose relatively to the other. gear wheel, means to shift one of said supports to bring disks of different size into driving engagement, and means to record the relative displacements of the disk and gear wheel which are loosely mounted relatively to each other.

4. In an apparatus for testing pairs of gear wheels, the combination with a pair of supports for said gear wheels for rotation thereof in engagement with each other, of a pair of disks the.diameters of which are of the same ratio as the diameters of the pitch lines of the gear wheels and adapted for correct driving engagement with each other and oneconnected with one of the gear wheels for rotation in harmony therewith and the other one loose re'Iatively to the other gear wheel, means to' shift said gear wheels and disks into engagement with each other, and means to ascertain the relative displacements of the disk and gear wheel which are loosely mounted relatively to each other.' 1 r 5. In an apparatus for testing the working faces of pairs of gear wheels, thecombination with a pair of rotary members, and a sleeve rotatably mounted concentrically of one of said members, the other of said rotary members and the sleeve being adapted to have the gear wheels to be tested secured thereto in position for engagement with each other, of a pair of friction disks the diameters of-which correspond respectively to the diameters of the pitch lines of the gear wheels and secured respectively to the rothe corresponding gear wheels, and means to ascertain the relative displacements of the gear wheel which is mounted on the sleeve and the friction disk which is mounted on the concentric rotary member.-

6. In an apparatus for testing the working faces of pairs of gear wheels, the combination with a pair of rotary members, and a sleeve rotatably mounted concentrically of one of said members, the other of said rotarymembers and the sleeve being adapted to have the gear wheels to be tested secured thereto in position for engagement with each other, of a pair of friction disks the diameters of which correspond respectively to the diameters of the pitch lines of the gear wheels and secured respectively to the rotary supports concentrically respectively of the corresponding gear wheels, a casing and an operating arm taking part respectively in the rotation of the'sleeve and the support which is concentric thereof, and a rocking indicating member mounted on said casing and engage by said arm.

In an apparatus for testing the working faces of pairs of gear wheels. the combination with a pair of rotarv members adapted to have the gear wheels to be tested secured thereto in position for proper meshing engagement with each other, of a support and an operating arm rotatable about the same axis, a rocking indicating member mounted on sald support and engaged v by saidarm, means for rotating said support from one of said gears, and means for rotating said operating arm from the other of said gears and at approximately the same speed as the speed of rotation of the casing.

8. In an apparatus for testing the working faces of pairs of gear wheels, the combination with a pair of rotary members adapted to have the gear wheels to be tested detachably secured thereto in position for meshing engagement with each other, of an indicating member mounted for movement about two independent'axes, and a pair of rotatable co-axial controllers for said indlcating member, one of said controllers being driven by 'one of said rotary members and e the other of said controllers being driven by the other member at approximately the same speed whereby uniform rotation of 4 said gears and controllers eflects movement of said indicating member about one of its axes and non-uniform rotation of said gears and controllers efi'ects movement of said indicating member about both of its axes.

- 9. In .an apparatus for testing pairs of gear wheels, the combination with a pair of .members forsupporting gear wheels to be tested, of means to effect a relative movement of said members toward and from each other tobring gears of different sizes into driving engagement, a stationary record blank support, a stylus, driving connections between said stylus and one of said members for moving said stylus in respect to the axis of said'record blank, and'means connecting said stylus with the other gear support for imparting a secondary movement to the stylus upon 'relative rotary movements of said supports other than uniform movements at. rates inversely proportional to the diameters of thepitch lines of the gears to be tested.

10. In an apparatus for testing pairs of gears whee1s,"thecombination with a pair of supports for said gear wheels forrotation of the latterin mes ing engagement, of a stationary record blank, a stylus carrying member rotated by one of said supports and a member rotated by the other of said supports at approximately the same speed as said first mentioned member and engaging with said stylus to move the latter in respect to the first mentioned member upon a variation in the relative rates of rotation of said gear and their supports.

11. In an apparatus for testin the working faces of pairs 'of-gear whee s, the combination with a pair of rotary members adapted to have the gear wheels to be tested secured thereto, a record blank co-axial with oneflof said members, a stylus, a carrier therefor secured to one of said supports and means driven by'the other support and rotatable with said stylus carrier for eifecting a movement of the stylus in respect to its carrier upon accelerations or retardations of the speed of one support in respect to the speed ofthe other.

nation of means to support rotatively and in mesh the gears to be tested, a pair of rotating members mounted coaxially, one' 13. In a gear testing machine, the combination of means to support rotatively and in mesh the gears to be tested, a pair of rotating members mounted coaxially, one rigid with one gear and the other driven from the other gear, and an indicating mechanism carried by one of said members and influenced by the other.

' 14. In a gear testing machine, the combi- -/nation of means to support rotatively and in mesh the gears to be tested, a pair of rotating members mounted coaxially, one rotated in harmony with one gear and the other driven from'the other gear at approximately the same speed as that at which said members and influenced by the other.

15. In a gear testing machine, the combination of means to support rotatively and in'mesh the gears to be tested, a pair of ro-.

tating members mounted coaxially, one rotated in harmon with one gear, driving means between t eother member and the 1 other gear and including a pair of disks having diameters of the same ratio as those of the pitch circles of the ears, and an indicating mechanism having diflerent movements produced by constant or varying relative movements of said members.

Signed at St. Gall, Switzerland, this 12m day of March, 1920.

HIPPOLYT SAURER.

12. In a gear testing machine, the combi-

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