US1674973A - Grinding machine - Google Patents

Description

June 26, 1928. v 1,674,973

A. L. KLINE ET AL 25 57 as 2 f 6 c I a W" II 11/1 June 2%, 11928.

KLINE ET AL GRINDING MACHINE F iled May 26, 1925 4 Sheets-Sheet 2 June 26, 11928, 1,674,973 A. L. KLINE ET AL v GRINDING MACHINE Filed Mdy 26, 1925 4 Sheets-Sheet 3 June 26, 1928. 1,674,973

A. L. KLINE ET AL GRIN'D'I Ne MACHINE led May 26, 1925 4 Sheets-Sheet 4 Suva-1N0;

. finhurL. Klime Char/es fC/ark 8 By 7 7 M (3H0: H114 4-5 STE Patent ARTHUR L.

MESNE ASSIGNMENTS, TO PRATT &

CORPORATION OF NEW JERSEY.

KLINE AND CHARLES E. CLARK, or mi'rnorr, MICHIGAN, assisnons, 3 y WHITNEY COMPANY, or NEW YORK, N. at, a

GRINDING MACHINE.

Application filed May 26,

I I This invention relates to grinding machines, and particularly to machines which the simultaneous grinding of spaced bores,

5 ternal combustion engines.

In such finish grinding operations, it has been heretofore proposed to simultaneously grind the various cylinders by a row of ro tary grinding wheels, mounted on parallel spindles above the cylinder block. Apparatus of this nature is disclosed in U. S. Patent No. 1,241,964, granted October 2, 1917 to Cyrus M. Grow and James M. Courtney, in which the cylinder block is mounted on a platen or table which is adapted for movement in a circular path in a horizontal plane, and which is driven by cranks mounted beneath and arranged along its axis. It is somewhat diflicult tov maintain the requisite accuracy in such arrangements, because of the multiplication of errors in either crank by the distance between the cranks, introduced principally by wear in the crank bearings.

Such devices are also complicated, and additional errors are introduced because it is necessary that the cranks, or other driving means, operate in perfect synchronism. lhe

construction to secure such action is expensive, and greatly increases the cost of apparatusof this type.

One of the objects of the present inven tion is to provide a machine of this character in which the platen is driven by a single means connected at one point.

Another object of the invention is to provide a simple .and highly accurate mechanism for maintaining the axis of the platen always parallel to a given'line in the horizontal plane of its circular movement,

Another object of the invention is to provide simple and accurate means for adjusting the throw of the platen driving means without interrupting the motion thereof.

Another object of the invention is to provide apparatus of the character described which shall be inexpensive to build and accessibly arranged for adjustment and repair.

Other objects of the invention will appear from the'following description taken in connection with the drawings, which form a part of this specification, and in which:

Fig. 1 is a view in side elevation, partially in section and partially broken away, of a 1925. Serial No. 32,913.

grinding machine constructed in accordance with this invention;

Fig. 2 is a view in section, substantially on the line 2-2 of Fig. 1, showing the controlling linkage for the-platen motion in plan;

' Fig. 3 is a diagrammatic representation of the platen and its guiding mechanism in plan, showing the parts in several successive positions in thecircular path of the platen;

Fig. 4 is a view in section substantially on the line 4-4 of Fig. 1;

Fig. 5 is a view, partially in elevation, and

partially in vertical section through the platen and the driving mechanism thereof;

Fig. 6 is a view in vertical section through the platen driving mechanism, taken at right angles to the section of Fig. 5;

Fig. 7 is a fragmentary section taken substantially on the line 7-7of Fig. 6;

Fi 8 is a fragmentary section taken substantially on the line 88 of Fig. 6;

Fig. 9 is a view in front elevation of the platen supporting table, the platen being shown partially in verticalsection thereon;

Fig. 10 is a detail View showing the bearings for the grinding spindles, and

Fig. 11 is a detail view showing the construction of the pivot pins of the platen control linkage.

Referring to the drawings. at 10 is shown a base casting or support for the machine having parallel sides 11, and parallel transverse partitions 12 and 13. surmounted by a top portion forming a table 14 which overhangs the partitions 12 and 13 at the front and the rear of the machine respectively. Mountedon the table 14 is a tool supporting pedestal 16 having spaced feet 17 which may be secured to the support in any suitable manner. On the forward portion of the table 14 is a work supporting bed or platen 18, which is mounted to slide in a horizontal plane thereon. To this platen 18, the cylinder block 19, or other work to be ground, is securely fastened by clamps (not shown) or in any other convenient manner. The cylinder block 19, herein illustrated by way of example, is provided with parallel cylindrical bores 21, which have been cast in the block and rough machined. and which are ready for grinding to finished size. In the embodiment illustrated, the machine is shown as adapted for the grinding of a 7 1 row, but it is to be understood that any num her of cylinders may beground on machines constructed in accordance with this invention.

The pedestal 16 has a forwardly projecting portion 22, arranged to overhang the platen 18, and this portion has a vertically dispose forward face 23, which is provided at its sides with guide ribs 27, on which a tool carrier or slide 24 is mounted for reciprocating motion in a vertical plane. The slide 24 is constrained to motion in the vertical plane ofthe face 23 by guide me1nhers 26, removably secured to the slide 24 and co-operating with the ribs 27.

Mounted in the slide 24 is a row of parallel tool spindles 28, one for each of the cylinders of the cylinder block to be ground, and these spindles are spaced in accordance with the spacing of the said cylinder bores 21. Each oft-he spindles 28 is journaled for rotation on its own axis in bearings 29 which are appropriately mounted within bores 30 in the tool slide in any suitable manner, as clearly indicated in Fig. 10. The spindles are provided at their lower ends with grinding wheels 31, arranged in a horizontal plane, and attheir upper ends with drive gears 32 by means of which they may be rotated on their respective axes.

provided with suitable motorbrackets 33-on which are mount-ed suitable motors 34.

Each of these motors is provided at its upper end with a gear 36, adapted to mesh with two of the drive gears 32, so that'each motor supplies the power for the rotation of two of the spindles 28.

The slide 24 is adapted to be raised and lowered in the, plane of its guides 26 by any convenient mechanism, such as the screw 37, co-operating with a nut 38 formed in the body of the slide 24. The screw 37 is preferably provided with a suitable power drive which is under the control of the operator of the machine. As illustrated, this drive consists of a gear 39 secured to the upper end of the screw shaft anddriven by a reversible control motor 40. Automatic reversing switches and other control mechanism (not shown) for the motor 40 may be provided if desired, and as such control apparatus is well known to theart to which this invention relates it will not be described further. By means of the screw mechanism just described, the slide 24 may be fed steadily and smoothly toward or from the cylinder-block 19, carrying the grinding wheels 31 along the walls 21 of the cylinders being ground.

The lower surface of the platen 18 is provided with downwardly disposed edge portions 41 on which it is sli ably supported on the upper surface of the table 14, and at the center of the platen is a downwardly The I forwardlydisposed face of the slide 24 is projecting lug 42 which is provided with a bushing 43 to receive the driving end of an eccentric shaft 44 which has an integral flange 46 secured to the table, as by screws 47. The shaft 44 is journaled in concentric bushings 48 mounted in an eccentric sleeve 49, which is in turn journaled in concentric bushings 51 in an eccentric sleeve 52. This outer sleeve 52 is mounted for rotation in bearings 53 and 54 which are preferably in tegral with the support 10 and which are 'split as indicated iii-Figs. 5 and 7. Each of the members 49, 51 and 52 is provided at its upper end with an outwardly disposed flange, which flanges are arranged in series and are supported on the upper bearing 53 {)0 take the axial thrust of the driving mem- A worm wheel 56 is rigidly'keyed to the outer eccentric sleeve 52 intermediate the bearings 53 and 54 and is adapted to be driven by a worm 57 mounted upon the shaft 58. An annular worm wheel 61, of similar size, is mounted in a groove formed at the lower end of thesleeve 52 between a shoulder 62 secured thereon, and a washer 63 secured by an annular nut 64. This worm wheel'61 is not directly connected to the sleeve,52, and it may be rotated independently thereof. It is driven, during normal operation of the machine, in the same direction and at the same speed as the prises a differential gear 68, keyed to the shaft 58, and'an aligned differential gear 69 kc ed to a spur gear 70 which is connected by a spur idler 71 to a gear 72 on the shaft 67. The gears ,68- and 69 are adapted to mesh with differential bevel pinions 73 and 74 mounted respectively on shafts 75 and 7 6 in a differential cage 77 to which is keyed a worm gear 78. This gear 78, and accordingly the differential cage and its shafts,.is normally held from rotation about the axis of the shaft 58 by means of an interm'eshing worm 79, suitably secured to an adjustment shaft 81. The shaft 81 projects through the transverse partitions to the forward portion of the machine where it is provided with suitable means for manual adjustment, such as the hand crank 82 which may, if desired, be provided with suitable indicating dials 83. The shaft 58 may be driven in any convenient way, as by a pulley 84 on its rear end, connected by a belt 85 to a suitable motor, or other source of power (not shown). i

The inner s face of the annular worm wheel 61 is ci cumferentially threaded as at 86, and these threads 86 are in operative encured to a shaft 88 which is suita y,- 10111- 'naled in a recess 89 formed in the thicker .tial gear 69 side of the eccentric sleeve 52. A worm'91 is keyed to the shaft 88 and is in operative engagement with a worm wheel 92 which is rigidly keyed to the inner eccentric sleeve 49.

The operation of the drive gear just described will be apparent. During the normal running of the machine, the Worm wheel 61 is rotated at the same speed as the worm wheel 56by means of the differential gear 69, the gear train 70, 71 and 7 2, and the worm 66. During such rotation the inner eccentric sleeve 49 is carried around with the outer or driving sleeve 52, and having no rotation on its own axis, ac ts simply as a bushing between the outer sleeve and the shaft or pin 44. If, however, it is desired to adjust the eccentricity of the platen drive and the shaft 81 is rotated accordingly by the hand crank 82, then the diiferential cage will he correspondingly moved through the worm 79' and the worm wheel 78, so, that the difierenis either accelerated or retarded withrespect to the differential gear 68 to a new position with respect thereto. This movement is communicated through the connectinggear to the worm 61, which is thereby rotated with respect to the sleeve 52, and accordingly actuates the gear 87 and the worm 91. Movement of the worm 91 is directly communicated through the worm wheel 92 to the inner .sleeve 48, and movement ofthis sleeve with respect to the outer sleeve results in a .variation of the eccentricity of the driving means, and a corresponding change in the radius of movement in the crank pin or shaft 44, as will be readil understood. In this way means are provided whereby the throw of the work supporting platen 18 may be varied at will within limits, and during motion thereof.

Slidably mounted on the rear portion of the table 14 between the spaced feet 17 of the pedestal 16 is a floating frame or member 93, preferably of the triangular form shown, and of any construction adapted to combine lightness with rigidity. The apex A and the center B of the base of this floating member are connected, as by the pivoted links 94 and 95 respectively, to anchor blocks 96, adjustably secured to the table 14 in any suit-able manner as by the screws 97. In this way the points A and B are constrained to move in the arcs cm and 66 respectively, as will be evident. The other apices G and D of the floating member are pivotally connected by similar parallel links 98 and 99 to the ends of the platen 18, on whichlugs 101 are provided for this pur ose. The pivotal connections at the oints B, C and D, and at the anchor bloc s96 and at the lugs 101, may be of any suitable construction, but preferably each comprises a tapered pin 102 adapted to be drawn into engagement on its taper-with the associated parts by a suit able spring 103, as clearly shown in Figrll.

In this way all looseness and lost motion in the pivotal connection caused by Wear of the pin and the connected members is automatically taken up.

It will be evident that the linkage just described controls the motion of the platen 18. Thus, if a point in the center of the platen is moved through the are of a circle, as by means of the eccentric 52 and the shaft 44 actuated thereby, the ends of the platen will be constrained to motion in similar and equal arcs, since the parallel links 98 and 99 maintain the,axis of the platen always parallel to a line connecting C and D. And since the points (3 and I), together with all other points on the member 93 are constrained to motion along arcs similar to the arcs am and bb, the platen 18 is driven with acircular motion in a horizontal plane, during which its axis always remains parallel to a given line on the stationary table of the machine.

This movement of the various parts of thev control linkage and of the platen, is diagrammatically shown in Fig. 3, in which the parts have been shown in several successive positions through one revolution of the eccentric 52.

It will be evident that this invention provides a cylinder grinding machine in which highly accurate results are obtained in a simple and relatively inexpensive structure. Since only a single driving eccentric is employed, no errors caused by inexact synchronization of dual driving means can atfect the work, and because of the location of the driving point at the center of the cyljustment. This adjustment also provides a convenient means for compensating for wear on the grinding wheels.

What is claimed is:

1. The combination in a machine having a work supporting platen adapted for motion in a horizontal plane, of means to move one point of the platen in a circular path in said plane, and means to maintain the platen parallel to a given line in said plane,

said means including a floating member and two pairs of parallel links normally disposed relative to each other and said pairs, pivotally connected respectively to said member Hill and a fixed support and to the platen and member.

2. The combination in a grinding machine having av Work supporting platen mounted for motion on a fixed table, an adjustable eccentric for driving said platen so that a point of the platen will move in a circular path, a floating member, and pairs of parallel links pivotally connecting the memher to the platen and table respectively, said pairs of links being disposed substantially at right angles to each other in one position of sad platen.

3. The combination in. a grinding machine fixed with respect to the platen, parallel links pivot-ally connected to" the abutments and to one apex and the opposite side of said member respectively, and parallel links pivotally connected to the other apices of the member and to the ends of the platen respectively.

-]In testimony whereof tures.

ARTHUR L. KLKNE. .CHARLES E. CLARK.

we afiix our sigma 25

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