US1308634A - Driving mechanism - Google Patents

Description

M. C. INDAHL.

DRIVING MECHANISM.

APPLICATION Hm) AUG.24, 1915.

1,308,634. Patented July 1, 1919.

4 SHEETS-SHEET I.

M. C INDAHL.

DRIVING MECHANISM.

APPLICATION FILED AUG.24. 19x6 Patented July 1, 1919.

M, C. QNDAHL.

BRWING MECHANISM.

APPLICATION man AUG-M916.

1,308,634. Patented J uly 1, 1919.

4 SHEETS--SHEET 3 i iii 42 M. CJINDAHL.

DRIVENG MECHANISM. APPLICATION FILED 16.24. I916.

1,308,634. Patented July 1, 1919.

4 SNEETSSHEEI 4.

MAURITZ C. INDAHL, 0F PHILADELPHIA, PENNSYLVANIA.

DRIVING MECHANISM.

Specification of Letters Patent.

Application filed August 24, 1916. Serial No. 116.683.

To all whom it may concern lle it known that I, Mnunrrz INDAHL, a. citizen of the United States, residing at; Philadelphia. in the county of Philadelphia and. State of Pennsylvania, have invented certain .new and useful Improvements in Driving Mechanism; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being bad to the accompanying drawings, forming part of this specifici'ition.

This invention relates to driving mechanism wherein a pair of driven members are adapted to be driven at ditterential speeds, and the primary object in view is the provision of an improved and novel means for arbitrarily causing said members to be positively driven at variable ratios of differentiation.

With the above and other objects in view the invention consists in certain novel eonstructions, combinations and arrangements of parts hereinafter described in a preferred form and pointed out in the claims at the end oi the specification.

In the drawings Figure 1 is a top plan view of one type of balanced differential gearing provided with the present improvements, the top wall of the gear box or casing being partially broken away to show the interior construction.

Fig. 2 is a horizontal longitudinal sectional view of the same.

Fig. 3 is a rear elevation of Fig. 1 with the rear wall of the gear box partially broken away.

Fig. at is a detailed vertical sectional view taken on the line 4-4 of Fig. 2.

Fig. iris a detailed vertical sectional view taken on the line 5--5 of Fig. 1.

Fig. 6 is a front elevation of the gear box.

Fi 7 is a side elevation of the same.

Fig. 8 is a rear elevation.

Fig. 9 is a diagrammatic plan view of the front and rear wheels of a motor driven vehicle illustrating the present improved differential mechanlsm controlled by steering gear of one type.

Fig. 10 is a diagrammatic side elevation of the arrangement illustratedin Fig. 9.

Fig. 11 is another diagrammatic pla n view illustrating the differential mechanism controlled by a different type of steering gear.

Fig. 12 is a diagraimnatic side elevation of the arrangement illustrated in Fig. 11.

Fig. 13 is a detail view hereinafter more fully described.

Like characters of reference in the sev eral figures indicate the same parts.

Although it will be understood that the invention is capable of broad application and many different uses, its utility is strilo ingly illustrated when employed in connec tion with difierontial gears for motor driven vehicles, such as automobiles, and, hence, for convenience. the present description will be confined to this mirtieular use of the invention. The purpose of a diilbrential gear as commonly employed, by an automo ile, is to divide the power from the motor equally to the two driven members of a lil" vided wheel axle, and in such manner that the relative speeds of the two driven members may be varied by outside conditions without allecting the motor. Thus. in elfeet. a dil ferential gear is a means for permitting aeceleration in speed of one driven member accompanied by a reduction in speed of the other driven member, the reduction in speed in some instances being proportionate to the acceleration.

According to the present in ention, two members adapted to be driven at di tfercntial speeds, as in the above set forth manner, may be positively driven at variable ratios of diflerentiation arbitrarily selected. for example, at the will of the driver of a motor car. This variation of differential action may be advantageously utilized for steering purposes, since the driver will be enabled by proper manipulation to positively accelerate the speed of one driven member and concurrently to positively diminish the speed of the other driven member. As this acceleration and diminution in speed of the driven menr bers at the opposite sides of a motor car can. be effected at any desired ratio of differentiation within the limits of differential action, it is obvious that the *ar an quickly be turned on a long or short radius determined solely by the ratio of dilierentiation at which the driven members are driven. In this way, steering may in some instances be effected by the power of the motor itself; and with little effort on the part of the driver of the car. If the driven members support the rear driving wheels and steering is effected through front steering wheels, as is common in automobiles, the principle of my invention may advantageously be utilized by controlling the ratio of differenlaiented July I. w th".

tinted speeds at which the driven members are driven directly by the steering gear. By

this, the steering operation will be greatly V illustrated in the accompanying drawings is one well known type of balanced diflFer ential gearing employed in motor cars wherein the power from the motor is normall equally distriggted to the two driven members of a divid wheel axle or shaft. In the form shown, the differential gearing is of the bevel gear type and is inclosed within the stationary gear box or casing 1.

box is provided with suitable sleeve bearings 2, 3,1oattd respectively in the right and left hand walls of the box and in which are journaled the right and left hand driven members 4, 5, of a divided wheel axle or shaft. It will be understood that, in the present embodiment, each driven member is adapted at its outer end to support and drive a wheel. A shell 6 is provided at its right and left hand ends with sleeves 7, 8, the latter being journaled for rotation on the driven members 4, 5, and also within right and left hand bearing sleeves 9, 10, supported by the gear box 1, as shown in Fig. 2. This rotary shell 6 is rovided with a large worm gear 11 in mes with a worm 12 carried by the end of the driving member or shaft 13 which is suitably journaled. in the upper wall of the gear box, as shown in Fig. 7. 1n the present embodiment of the invention, the shaft 13 is the Cardan or transmission shaft of a motor Fixed respectively to "the right and left hand driven members 4, 5 and located within the rotary shell 6 are the right and left hand bevel drive gears 14, 15. Journaled for rotation on fixed stud shafts 16 mounted within shell 6 are the bevel differential pinions 17, the latter being in the present embodiment four in number, as shown in Fig. 4. These pinions 17 are in mesh with the right and left hand gears 14 and 15. The operation of differential gearing of this type is well known in the art, it being sufficient to state that the several p-inions 17 serve normally, to distribute power from the rotary shell 6 equally to the respective driven members 4, 5, through the intermediary gears 14, 1B, and also permit one driven member to revolve with a greater speed than the normal drive accompanied by This gear yoke a proportional reduction in speed of the other driven member, and this, without in any way disturbing the Cardan or transmission shaft 13.

The present invention has particular reference to the means for arbitrarily causing the driven members 4, 5 to be driven at variable ratios of differentiation, or, in other words, by the present invention, the speed of one driven member may be accelerated through manual manipulation and concurrently the speed of the other driven member may be diminished. driven members are under the manual control of the driver of the car, it is obvious that they may be positively driven at any desired predetermined ratios of differentiated speeds, for example, one driven member can be accelerated to any predetermined extent within the limits of the capacity for differentiation and concurrently the speed of the other driven member can be proportionately diminished. The means for apilying this rinciple in the operation of a riving mec anism will now be described.

Fixed respectively to the driven members 4,5 are bevel gears gears are respectively in mesh with bevel pinions 20, 21, on shafts 22, 23, disposed at right angles to the driven members 4, 5. The shafts 22, 23, are journaled for rotation in bearings 24, 25 formed in the side walls of the gear box 1 and project into a chamber 26 located at the inner end of said gear box and-'inclosed by extensions of the walls thereof. Within the chamber 26 and fixed respectively to the projecting ends of shafts 22, 23, are friction disks 27,28. Extendi lon itudinally of the chamber 28 is a fix sha 29 on which is slidably and rockably mounted a iokefifl. The lower'arms 31, 32 of said yo e are provided with journals as shown in Fig. 3, supporting the spindle 33' of a roller 34. R01 er 34 is provided with opposite engagin peripheral surfaces 35, 36, adapted to be t rown into frictional contact with the respective friction disks 27, 28, as will hereinafter appear. Above the fixed shaft 29 the yoke 30 is formed with a rack 37 in mesh with a pinion 38 on the steering shaft 39, the latter extending transversely within chamber 26 and being supported by suitable bearings 40, 41., as shown in Fig. 5.

From the foregoing description, it is obvious that by rotatin' steering shaft 39 fl330 is shifted longitudinally along fixed s a f ces 35, 36 of the roller 34 are moved across the faces of the disks 27, 28. Assum' that yoke -30 is shifted toward the right iif Fig. 3, the engaging surface 35 of disk 34 1s 29, and, as a result, the engaging sur- As the speeds of both 18,19, (Fig. 2). These moved toward the center of friction disk I toward the periphery of disk 98. Accordingly, it the said engaging surfaces 35, 30 are brought into frictitirnal contact with the disks :27, 255, the driven members 4-, 5 will be positively driven at dittcrential speeds, the ratio f ditterontiation depending upon the distance which engaging snrface 35 has been moved toward the center of disk 27 and, concurrently, the distant: which engaging surface 36 has been mm at toward the periphery of disk 28. When the parts are in this position, the speed of driven member 5 is diminished and the speed of driven member ,4 accelerated. By shifting yoke 30 reversely, 27. 6., toward the left of Fig. 3, the speed of driven member 5 may be accelerated and that of driven memher at diminished. It will be noted that the above described positive drive of the me1nbers, 4, 5, at, variable ratios of differentiated speeds is efi'ected by simply turning the steering shaft 39 in one direction or the other, and by bringing the engaging surfaces of the roller 34 into ictional Contact with the disks. As soon agsuch frictional contact is established, the mbmbers 4, 5, are connected together and positively driven at the predetermined difi'erentiated speeds, the roller 34 forming a governing member for positively effecting this result. The ratio of differentiation at which the members 4, 5 are driven may be any ratio within the limits of dificrential action of the gearing, it being possible to drive the members i. at a great difference in speed, for example, when turning the motor car around a sharp curve, or at a very small difference in speed when the amount of steering to be done is relatively slight.

The longitudinal adjustment of yoke an to vary the ratio of differentiation of the driven members may be effected, while the. en aging surfaces 35, 36 are in contact with dis 5 27, 28, or said engaging surfaces may be moved out of contact with said disks and the longitudinal adjustment then el'l'ected. The mechanism for moving the engaging surfaces of the roller 34 into and. out of frictional contact with disks 27, 2 will now be described: Pivoted at 4:2 to the top plate of the casing is a lever arm 43, the latter supporting substantially midway its ends a roller 4.4 (Figs. 1 and Roller 44 is adapted to bear against the opposing face of the longitudinal bar 45 (Figs. 1. t and ti} of an open frame. 46 supported by the yoke 30 above the fixed shaft 29. A rod which, in the present embodiment, is mlaph ed to have an operative (utiliflvtie with a foot pedal of any preferred eonstruation, and indicated diagrammatieally by the reference character 48'' in Figs. ii. 1'3. is slidably journaled in a bearing termed in the front wall of the chamber :26. The inner ,cnd of said rod 48 is provided with yoke 47 adapted to embrace the yoke 49 of an alin-ed rod 49" slidably journaled-in the rear wall of the chamber :36 (Fig. 13). An adjustable head it) on rod it" and bearing against the outer face of the rear wall of the chamber limits the movement. of rod 49". Yoke 47 is provided with circular openings and yoke it? with slotted openings, as shown in Fig. 1; and a pin 47 passed through the openings in the respective yokes and the free end of bar 45, whereby the latter is pivoted to the yokes between the two alined shafts 48, 49". A spring 50 encircling rod -15) and interposed between the rear chamber wall and yoke $9 is adapted to yieldingly swing the. lever arm 43 in a direction to force. roller it into contact with bar 45 and thereby rock the yoke 30 on its sup porting shaft 29 to bring the engaging surfaces 35, 36 of the roller into frictional contact with disks 27, 28. \Vhcn operating rod 48 is moved in one direction so as toeompress the spring 50, arm 43 will be swung to move roller it away from bar 45. The arms 31 and 32 of the yoke are 50 disposed as to swing the roller 3- away from the disks 2?,

28, when this movement of rod 48 is effected.

The bar 45 is provided with a notch 51 in which the roller i-lis adapted to enter when the yoke is in neutral position, i. (a, when the driven members i, 5 are being driven at equalized speeds. in the normal operation of the motor -ar. The engagementof the roller H with the notch 51 permits the yoke ill) to swing roller 34 out of engagement with the disks 2'7, and the diiterential gearing hereinbefore described is thus free to act and permit auton'lat-ie acceleration of? one driven member accompanied by a proportionately diminished speed of the other driven member in the ordinary way.

liy reason of the slots in yoke -19, rod 48 may be shifted relatively to rod 49" in the reyerse direction to that. previously described. This movement will, of course, be accon'iplished by a reverse movement of the foot pedal 48, and when so done, eflects shifting of the yoke 30 tobring the engaging surfaces 35, 36 into contact with the, disks :27, 28, even when the yoke 30 is in neutral position, '1'. (a, with the roller 44 in notch 51. Thus, if one of the. wheels begins to slip when the differential gearing is free to act, both wheels may be driven positively at equalized speeds.

Figs. 5) to 12, inclusive, are diagrammatic representations of applications of the invention to different types of steering: gear em- }iiioyed in automobiles. Referring particularly to Figs. 5) and 10, the rear driven wheels of an automobile are indicated at 5:. said wheels being supported by the driven members 4, 5 of the present improved driv-- lug mechanism. The drive shaft 13 from the motor M enters the casing: l, and drives the shell of the differential gearing, as heretofore explained. Pivoted to turn in vertical axes on the front axle 53 are the front steering wheels 54, the latter having the usual steering knuckles 55 connected by a transverse bar 56. One of said knuckles has a steering mm 57 pivoted at its free end to a link 58 jointed to an arm 58 fixed on a small shaft 59. The link is operated to move the steering arm and turn the front Wheels by: turning the shaft 59 and the latter op eration is efl'ected the usual steering wheel 60 on a steering post 61 having a worm 62 in mesh with a worm gear 63 fixed on the shaft 59. Also fixed on shaft 59 is a bevel pinion 64 in mesh. with a bevel pinion 65 on a Cardan shaft 66, connected with the shaft 39 for operating the governing member 34.

\Vith this arrangement, turning of the wheel 60 to the left, will through the steering gear turn the front Wheels to the left. The motion of the shaft 59, in efi'ectin this nwvenient, is communicated to sba t 39, which, as has previously been stated, shifts the governing member. Accordingly, the latter will be shifted toward the right side of the machine, bringing the peripheral surface 35 of the governing member toward the periphery of disk 27 and peripheral surface 36 toward the center of disk 28. This movement of the governing member will be effective to positively drive the left hand rear wheel at a diminished speed and the speed of the right. hand rear wheel will be proportionately accelerated, thereby greatly assisting in the steering operation. The amount of difl'erentiation at which the rear wheels may be driven is dependent upon the degree of movement of the steering wheel 60; in other words, the ratio of differential action is directly proportionate tothc turning radius of the vehicle. On taming the front steering wheels to the right, the action of the governing member is the reverse of that described.

In the arrangement shown in Figs. 11 and 12, the operation of the governing membar is the same. A difl'erent type of steering gear is employed however. One of the steer ing knuckles 67 of the front wheels is elon gated beyond the connecting bar 68, and is pivoted to a steering rod 69. The latter in turn is pivoted to a link 70 on a longitudinal shaft 71. connected by a universal joint with the shaft 39. The steering post 61 is provided with a worm 7'2 meshing with a worm gear 73 on shaft 71, the turning movement imparted to the shaft 71 by this intermediate gearing on turning the steerin wheel 60, acts to o erate the link 70 to shift knuckle 67 and e ect steering. Simultaneously, the governing member controlling diflerential action is shifted the turning movement of shaft 71.

hat is claimed is:-

1. The combination of a driving member, a pair of members driven thereby through mechanism permitting said driven members to dilfercntiate in speed, and means independent of the driving member for arbitrarily causing said members to be driven positively at variable ratios of differentiation.

The combination with a driving member, a pair of driven members and means for permitting acceleration in speed of one of said driven members accompanied by a proportionately diminished speed of the other driven member, of means inde )endent of the driving members for a rbitrnrily causing said members to be driven positively at variable ratios of differentiation.

3. The combination of a pair of driven members, a driving member, gearing connections between said driven members and the driving member for driving said driven members normally at equalized speeds and also permitting an acceleration in speed of one of said driven members accompanied by a. proportionately diminished speed of the other driven member, and means independent of the driving member for. arbitrarily causing said driven ,gcmbers to be driven msitivcly at variable -ratios of difi'erentiation.

4. The combination of a pair of driven members, a driving m ber, differential gearing interposed betw the. driven members and the driving me lhB't'aiOl' permitting acceleration in speed of 'of said driven members accompanied by a proportionately diminished speed of the other driven member, and means independent of the driving member for arbitrarily causing said driven members to be driven positively at variable ratios of differentiation.

SLThe combination of a driving member, a pair of membcrsd-riven thereby through mechanism permitting said driven members to differentiate in speed, and manually operated controlling means for arbitrarily causing said driven members to be driven one by the other positively at variable ratios of dili'erentiation.

6. The combination with a pair of driven members and means for permitting acceleration in speed of one of said driven members accompanied by a. proportionately diminished speedof the other driven member, of a manually operated controlling means in arbitrarily causing said driven members to be driven one by the other positively at-variable ratios of differentiation.

7. The combination of a pair of driven members, a driving member, gearing cornice-- tions between said driven members and the driving member for driving said driven members normally at equalized speeds and also permitti an acceleration in speed of one of said driven members accompanied by pleportiona'tcly diminished speed of the other driven member. and a manually o.-

cvated controlling means for arbitrarily causing said driven members as be driven one by the other positively at variable ratios of d i liferentiatimi.

a. The combination of a pair of driven members, a driving member, dili'crential gearing interposed between thedriven momla-rs and the driving member for permitting accclerrmon in speed of one of said driven nwmbers accompanied by a proportionately diminished speed of the other driven member, and a mamially operated controlling means for arbitrarily causin said driven members to be driven one by t e other positively at variable ratios of difi'erentiation.

The combination. with a pair of driven members and means for permitting aceeleralion in speed of one of said members acconrpauird by a proportionately diminished spm-(l uf the other driven member, of a governing member for causing said driven men'ibers to differentiate at a predetermined ratiofand means for manually effecting an operative engagement or disengagement of said governing member and the driven memours.

ll). The combination of a pair of driven members, a. driving member, gearing connections between said driven members and the driving member for drivin said driven members i'iormally at equalize speeds and also permitting an acceleration in speed of one (it-said driven members accompanied by a proportionately diminished speed of the other driven member, a governing member for causing said driven members to diiterentiatc at a predetermined ratio, and means For manually effecting an operative engagement or disengagement of said governing member and the driven members.

11. The combination of a pair of driven members. driving member, differential gearing interposed between the driven members and the driving member for permitting acceleration in speed of one of said driven members accompanied by a proportionately diminished speed of the other driven member, a governing member for causing said driven members to difi'erentiate at a predetermined ratio, and means for manually effecting an operative engagement or disengagement of said governing member and the driven members.

15:. The combination of a pair of driven members adapted to be driven at difierentia s ends a governing member for causing said driven members to difi'crentiate at a predetermined ratio and normally in inoperative rrlution thereto, means for adjusting said governing member to vary the prcdcten mined ratio, and spring means for connecting said governing member with the driven nmnbri's.

13. The combination of a pair of driven members adapted to be driven at differential I speeds, a governing member for causing said driven members to difl'erentiate at a predetermined ratio normally in inoperative relation thereto, means for manually adjusting said governing membento vary the predetermined ratio, and sprmg means for connecting said governing member with the driven members.

ll. The combination of a pair of driven membe s, a drivin member, gearing connections between sai driven members and the driving member for driving said driven members normally at equalized speeds and also permitting an acceleration in speed of one of said driven members acc0mpanied by a roportionately diminished speed of the ot er driven member, a. governing member for causing said driven members to differentiate at a predetermined ratio normally in inoperative relation thereto, means for manually adjusting said governing member to vary the predetermined ratio, and spring means for connecting said governing member with the driven member.

15. The combination of a pair of driven members adapted to be driven at difi'erential speeds, a governing member for cansing said driven members to differentiate at a predetermined ratio normally in inoperative relation thereto, means for manually adjusting said governing member to vary the predetermined ratio, and means for automatically connecting said governing member With-the driven members when adjusted to drive the latter at a predetermined ratio of differentiation.

16. The combination with a pair of driven members adapted to be driven at differential speeds, a governing member for causing said driven members to differentiate at a predetermined ratio, means for manually adjusting said governing member to vary the pro determined ratio, and also to permit the driven members to be driven at equalized speeds, and means for automatically connecting the governing member with the driven members when adjusted to drive the letter at a predetermined ratio of differentietion and for disconnecting said governing member from the driven members when the latter are driven at equalized speeds.

17. The 'oombina-tion of a pair of driven members. a driving member, gearing oon nections between said driven members and the driving member for driving said driven members normally atsaid equalized speeds and also permitting an acceleration in speed of one of said driven members accompanied by a proportionately diminished speed of the other driven member, a gove ing member for causing said driven mem ers to differentiate at a predetermined ratio, means for manually adjusting said governing member to vary the prevletermined ratio, and also to permit the driven members to be driven at equalized speeds, and means for automatically connecting the governing member with the driven members when adjusted to drive the latter at a predetermined ratio of differentiation and for disconnecting said governing member from the driven members when the latter are driven at equalized speeds.

18. The combination of a drive shaft, a pair of rear wheels driven by said drive shaft through mechanism permitting said rear wheels to differentiate in speed. a pair of front steering wheels. manually operated steering gear for turning the latter. and means responsive to manual manipulation of the steering gear for arbitrarily causing said rear wheels to be driven positively at variable ratios of dilferentiation.

19. The combination with a. pair of rear driven wheels and means for pern'iitting ac celeration in speed of one of said driven. wheels accompanied by a proportionately diminished speed of the other driven wheel, of a pair of front steering wheels, manually operated steering gear for turning the latter. and means responsive to manual manipu lation of the steering: gear for arbitrarily causing said rear driven wheels to be driven positively at variable ratios of differentiation.

20. The (Oll'lbllltltlflll with a pair of rear driven wheels, adrive shaft. gearins connections between said driven whee and drive shaft for driving said wheels normally at equalized speeds and also permitting an acceleration in speed of one of said rear wheels accompanied by a proportionately diminished speed of the other rear wheel, a groverninn member for causing said rear wheels to differentiate at a predetermined. ratio, a pair of front steering wheels, manuallyoperated steering gear for turning the latter. and means responsive to manual manipulation of the steering gear for adjusting said governing member to vary the predetermined ratio.

21. The combination of a pair of driven members, a drive member, differential gearing between the driven members, and gearing positively connecting the driven members independently of the drive member so that one of said members-will be driven at a definite ratio to the speed of the other driven member.

22. The combination of a pair of driven members, a drive member, differential gearing between the driven members, and gearing inclflding a governing member positively connecting the driven members independently of the drive member, so that the speed of one of the driven members will bear a definite ratio of the speed of the other driven member for each position of the govtllllll'.

23. The combination of a pair of driven members, a drive member. dilterential gean ing between the driven members. and gearing including a governing member posi tively connecting the driven members indeptuidently of the drive member so that the speed of one of the driven members will. bea a definite ratio to the speed of the other driven member for each position of the governor, and means for moving the governor to any of a plurality of positions.

24. The combination of a pair of driven. members, a drive member, dilfcrential gearing between the driven members, a. friction wheel driven by each driven member, a means for causing the friction wheels to drive one of the driven members by power derived from the other driven member.

The combination of a pair of driven nien'ibers, in between the driven members, a friction wheel driven by each driven member, and means for causin the friction wheels to drive one of the t riven members by power derived from the other and at a definite ratio with respect to the speed of the other driven member.

26. The combination of a. pair of driven mei'nbers, a drive member, differential gearing between the driven members, a friction wheel driven by each driven member, and means for causing the friction wheels to drive one of the driven members by power derived from the other and at any one of a plurality of ratios with respect, to the speed of the other driven member.

127. The combination with a pair of driven members. a drive member, differential gearing between the driven members, and gearing adapted to be thrown into and out of connection with the driven members for cstablishing at will a positive drive between said driven members, whereby either may be controlled by the other.

.28. The combination with a pair of, riven members, a drive member, dilferenti gearing between the driven members, and gearing adapted to be thrown into and out of connection with the driven members for establishing at will a positive drive between Said driven members at any one of a plurality of difi'eient ratios.

29. In. a motor driven four-wheeled vehiele, drive mechanism for the rear wheels including a differential gear, steering means for the front. wheels, and means controlled by said steering means for positively con- .necting said rear wheels so as to assist in the steering by the front wheels.

30. The combination of a pair of driven members, a drive member, differential geab. lag between the driven members and through which the power of the.drive mema drive member, differential gearhm is communicated thereto, and manually ooh-oiled earing connecting the driven nn'mlmrs and operating to transfer :1 p0r- Lion of the power delivered to one driven 5 memhrr through the difi'vrrni in! to be trnnS' erred in the other driven member.

ill. In a IlliitQ' driven vehicle, drive IlifNlHliliHH] therefor, molnding a differential o gearing, steering means for the vehicle, and

means controlled by said steering means 10 whereby a portion of the power delivered through one side of the difl'erentinl will he. trzmsl'e'rrod to the other side themof for efferting :1 desired ratio of dillerentinticm.

MAURITZ C. INDAHL.

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