Патент USA US2127740код для вставки
' Allg- 23, 1938‘ ‘ v ‘ ' L. E. LA BRIE ‘ 2,127,740 BRAKE‘ ' Filed Dec. 19. 1955 ‘ ' 4QSheetS-Sheet 1 v2.6. INVEN TOR. L (/0451? _ A’. LA BIZ/E BY ' )(nLdva/ A TTORNEY. ‘ Aug. 23, 1.938- . _ ‘ 1.; a. LA BRIE BRAKE v 2,127,740 ' Filed Dec.' 19. 1935 ' . 4 Sheets-Shéet 2 -INVENTOR. L 0045/? f. L ABE/E ATTORNEY _ Aug- 23, 193-3- ' L. E. LA BRIE ' ' 2,127,740 BRAKE Filed Dec. 19, 1935 4 Sheets-Sheet 3 59 20 £76.? INL/ENTOR. . - A (1045/2, 5. LA ER/E ATTORNEK ' Aug. 23, 1938. ' L. E.‘ LA BRIE ‘BRAKE ' > v 2,127,740 . Filed Dec. is, 1955 4 Sheets-Sheet 4 . INVENTOR. 41/0657? E LA?/EV: ‘ BY ‘ a ' ' ATTOR - E14 ‘ 2,127,740 Patented Aug. 23, 1938 UNITED STATES PATENT OFFICE ' 2,121,140 BRAKE udger E. La Brie, Detroit, .Mich., assignor to Bendix Products Corporation, South Bend, Ind, a corporation of Indiana Application December 19, '1935, Serial No. 55,218 12 Claims. (01. 188-140) ' It is expressly understood, however, that the This invention relates to‘ motor vehicle power brakes and more particularly to those known‘ drawings are employed for purposes of illus as mechanical servo brakes, wherein the power tration only and are not designed as a de?nition obtained for brake operation is derived from ‘of ‘the limits of the invention, reference being V 5 5 torque taken from a controllable friction device, had for this purpose to the appended claims. ' In the drawings, wherein like reference numer associated with a direct connection with the pro peller shaft of a vehicle or its equivalent, the ‘als indicate like parts: Fig. 1 is a longitudinal section taken through friction device being so arranged that brake en gagement is readily regulated by controlling the the friction and actuating mechanism of a. me ‘ V extent of frictional contact between a continu~ chanical servo; Fig. 2 is an end view of the servo of Fig. 1 illus ously rotating element and an element whose trating the linkage and connections to a. vehicle ~ rotation is adapted to operate the brakes. A dis tinguishing feature of the present invention is an brake operating cross-shaft; Fig. 3 is an end view of the mechanical servo arrangement whereby the degree of braking of Fig. 1 supplied with a modi?ed linkage for the i5 ' force and the degree of movement of the brak ing linkage affects the operation of the friction transmission of power to the brake operating cross-shaft; ' ‘ i in] i controlling member, so that the operator is en Fig. 4 is a top view of the linkage of Fig. 3; V abled to feel‘ the extent of braking action, the Fig. 5 is a side view of the mechanical servo operation of the controlling memberbeing gen taken on a plane passing through the line 5-5 20 20 erally proportional to the power effort transmit of Fig. d; ' ted to the brakes. Fig. 6 is an end view of a detail of a portion of Accordingly, it is an 'object of this invention to provide a new and improved mechanical servo the cross-shaft as viewed from a plane indicated V brake employing a friction brake operating at 6-6 in Fig. 3; Fig. '7 is a sectional view of the mechanical 25 torque device together with novel actuating 25 servo of Figs. 1 and 2 taken on the line 1-1 of means for the friction device. . Another object of the invention is to provide Fig. i; Fig. 8 is a top view of e. modi?ed form of me a new and improved mechanical servo brake of chanical servo with a different brakeoperating the friction type wherein the actuating means re cross-shaft linkage; , 30 quires a force in proportion to the brakeoperat Fig. 9 is an end elevation of the mechanical ing power developed by the mechanical servo. A further object of the invention is to provide servo of Fig. 8, portions being cut away, partic a new and improved mechanical servo brake of ularly as on the'line 9—9 of Fig. 10, and Fig. 10 is a side elevation of the same, a por the friction type wherein the actuating means re tion thereof being shown in section as indicated 35 35 quires a movement in proportion to the move _ ment of the brake operating linkage operated by the section line Ill-I0 of Fig. 9. Referring to the drawings and more particu- ' by the mechanical servo. larly to Figs. 1, 2 and 7, there is shown a trans Still another object of the invention is to pro vide a new and improved mechanical servo mission or gear box 20 having mounted on the back end thereof a casing 22 enclosing a shaft 40 brake of the friction type wherein the actuating means therefor requires a movement in propor tion to the movement of the brake operating linkage operated by the mechanical servo and requires an actuating force in proportion to the 45 brake operating power developed by the mechan ical servo. ' ' Other objects of the invention have to do with the constructions and modi?cations employed to obtain the results incident to the foregoing ‘ob 50 facts and to provide structures of simplicity, rug gedness, reliability and emcient operation. The above and other novel features of the in vention will appear more fully hereinafter from the following detailed description when taken in 65 conjunction with the accompanying drawings. extension 2!, the latter being provided with ‘a spiral gear 26 meshing with a second spiral gear 28 mounted on an axis at right anglesthereto and therebelow. The spiral gear 28 is splined to a. shaft 30 carried in and extending through a plain bearing 32 in one side of the casing 22 and in‘ a double thrust anti-friction bearing 3| rig idly ‘held in place between the bearing support plate 36 and a side cover plate 38. The casing 22 ‘is provided with a cylindrical outwardly facing cup or shell 3!‘ on the, plain bearing side thereof to which is secured a‘ cover plate 40 integral with stub shaft bearing sup port 42. The shaft 30 extending through the -‘ plain bearing 32 in the side of the casing 22 is 55 2 2,127,740 provided with a ?ange 44 to which is secured a cup-shaped spider 40, the latter substantially ?lling the outwardly facing cup or shell 39 and carrying an annular rotatable friction disc 40, the same being splined to the spider40 by inter engaging slots and teeth 00. The annular friction disc with friction linings 02 and 04 is adapted to be engaged by relatively of linkage connecting the power servo with the cross-shaft is illustrated wherein the '“feel” trans mitted to the actuating lever or pedal through link I02 is a combination of the rotation of the stationary although slightly rotatable friction of, the other end'of which is connected through a link I00 to the actuating lever 04', which is 10 offset as shown to bring it somewhat in line with lever arm 80'. The cable 94' is then connected 10 plates 00 and 00 located on either side of friction disc 40 and supported from and splined on a stub shaft 00 rotatably carried in the stub shaft bearing support 42, the stub shaft being aligned with the shaft 00. The stub shaft 00 is provided 15 with a shoulder 02 on its end adapted to limit the axial movement of one'of the plates 00 and 00, and a helical compression spring 00 is located around the shaft 00 between the plates to nor mally separate the plates from engagement with to .the ?oating lever .at any suitable point such as I06, it being understood that the point may‘ be varied in its distance from the connection I08 between the ?oating lever and the arm 88' de pending upon the extent of the desired torque reaction desired on the actuating cable I02, the greater the distance, the greater the reaction. It will also be understood that the torque reac '20 the friction disc 40. Located on the shaft 00 and between the bear tion of this particular modi?cation applies only ing support 42 and the friction plates 00 and 00 for brake actuation wherein the cable 94' is ‘under tension and thus operates for one direc tion of rotation of the shaft 00, although a similar are a pair of rock levers 04 and 00, each of which has a hub portion 00 and ‘I0 having conical re 26 cesses ‘I2 in the adjacent faces thereof which contain thrust balls ‘I4. Relative rotation of the ' levers thus produces an axial spreading action which reacts upon a threaded adjustment sleeve 10 and forces the friction plate 00' towards the 30 friction plate 00 thereby frictionally engaging the annular friction disc 40. The lever 04 reacts through a thrust bearing 00 which may be, if desired, keyed to the sleeve ‘I0 and which also contains grease retaining washer 00. The 35 lever- 00 likewise acts through a thrust bearing v0‘I which may, if desired, be keyed to a thrust sleeve ‘I0 and the plate 00. Grease retaining washers ‘II and ‘I0 are also provided, the washers _00, 'II and "being necessary in view of the open slot 4| in the casing 42 through the levers ex tend and the provision for greasing from a grease ?tting 00, rather than the lubricant in the trans mission. The position of the sleeve ‘I0 may be variedat will for adjustment purposes and locked 45 cross-shaft and the torque applied thereto. For this purpose, the lever arm 88' is not directly connected to the cross-shaft lever 96’ but is ' connected to a ?oating lever I04 at one end there in place by the clamping bolt 02 acting 'on the split end of the casing 42. ' - I In Fig. 2, there is shown a wheel brake operating cross-shaft 04' from which the vehicle brakes ' a may be operated. The shaft 00 which is splined to the friction plates 00 and 00 is provided at its exposed end with a lever having oppositely ex tending arms 00 and“ and a splft hub 00 with a clamp bolt II.‘ The lever arms are connected .by ?exible cables 02 and 04 to a lever 00 fixed to the cross-shaft 04, so that-rotation of the shaft 00 in either direction will tension one cable and buckle the other to always rock the cross-shaft in one direction only. The lever arm 00 is shown vas slightly shorter than arm 00, thus permitting the attachment of cable 02 on lever 00 at a point 20 arrangement may be inserted in the link 92' to - make the apparatus torque responsive for either direction of rotation. In Figs. -8, 9. and 10 a modi?ed form of the present invention'is illustrated, the same how ever comprising a transmission power take-oh" having a casing I20 secured to the rear of the usual transmission casing I22. The transmission drive shaft I24 which extends into the power take-oi! casing I20 is provided with an exten sion sleeve I20 splined thereon which emerges with a universal joint ?ange I20 from the rear of the housing I20. The usual universal joint I00 connecting the transmission to the propeller shaft is secured to the ?ange I20, and the sleeve is held on the drive shaft I24 by an extension 40 nut I00 and washer I00 engaging an internal shoulder I00 in the sleevetand threaded con centrically on the end I01 of the drive shaft I24. The‘ sleeve is provided with a worm I32 for driving a worm wheel I04, and also a speedom eter worm I00. A packing I20 and oil slinger I40 are associated. with the sleeve where it emerges from the casing I20 to prevent the loss of lubricant. ' The worm wheel I04 is splined and ?xed in 50' position on a shaft I42 having bearings I44 and I40 in the housing I20, the shaft extending out side the housing as at I40 and being provided with a spline I00 for slidably carrying a friction disc I02. Adjacent-the friction disc I02 is av 55 relatively stationary friction plate "4' mounted on a'sleeve I00 rotatably supported on a cylin drical bearing I01 surrounding the shaft bearing I40 and concentric‘ therewith. The friction disc I02 is adapted to slide on the spline I00 and a spring I00 on the shaft I42 urges the'disc I02 It will be understood that one of the operating to the left or away from the plate I04. On the levers 04 or 00 could be ?xed and the other actu- - extreme end of the shaft I42 are a pair of ated to apply the brake. but to provide a measure nuts I00 forming a reaction shoulder vagainst of “feei" in the actuation of the brake, one of which the thrust or actuating levers I00 and I02 65 the levers, for example 00, is connected to a‘ may bear whenoperating to move the disc I02 second lever 00 on the cross-shaft 04 by a cable to the right and into frictional contact with the I00, and thus as the cross-shaft rocks, the lever plate I04. As in the modi?cation of Fig. ‘1, 00 is permitted to follow the movement of lever the levers I00 and I02 have collar parts I04 70 04 which is suitably connected to a hand lever and I00 with facing conical recesses I00 in which 70 or pedal through cable I02, so that the extent' are placed balls I00, so that relative rotation of of movement of the cross-shaft can always be the levers I00 and I02 causes a spreading action. felt by the extent of movement of the actuating As before thrust bearings I10 and "2 are pro lever 04 due to the follow-up action of lever 00. vided together with suitable packing I14, I10 In Figs. 3 to 6 inclusive, a slightlymo'di?ed form and I" so as to totally enclose the bearings and 75 70 short of the end. ‘ 2,127,740 protect them from the elements. Likewise the friction disc I52 is provided with a dust guard I53 so that the exposed parts may be protected. A stiff spring I18 tensioned between the casing and an eye I18 secured to the plate I58 main tains its supporting sleeve I88 against a shoulder I88 at the end of the cylindrical bearing I51. A felt dust guard I82 is likewise provided at the , shoulder I88 to prevent entrance of dirt. To deliver the' torque transmitted to the 10 fric , 3 thereto but may be embodied in other mechanical arrangements and forms. For example, the va rious features of any one of the modi?cations might be substituted for those of the other modi fications. As such and other changes inv con struction and arrangement may be made with out departing from the spirit of the invention as will be apparent to those skilled in the art, reference will be .had to the appended claims for a definition of the limits of the invention.‘ 10 tion disc. I58, the same is provided with a pair What is claimed is: . of studs I84 and I88 forming crank pins and a 1. In a mechanical servo power brake, a fric pair of links I88 and I98 which extend there tion disc driven from an automotive vehicle drive from to a sector or bell crank lever I92 ?xed to shaft and rotatable therewith, a friction plate en a wheel brake operating cross-shaft I94. The . gageable with said friction disc, means for trans 15 link I88 connected to the pin I84 located above‘ mitting torque from said plate to wheel brakes in center is provided with a pin and slot connection cluding a coaxial shaft having levers at oneend and said plate at the other, a pair of relatively I98 to the bell crank I82 so that clockwise rota tion of the friction plate I54 will cause clock rotatable control levers coaxially arranged with respect to said disc, plate and shaft and between 20 20 wise rotation of. the sector. The link I88 is con nected to the sector or bell crank lever I82 and to said first named levers and plate, and means for the pin I88 through an overrunning slot I88, the pin I86 being below the center of the plate I88, _ counter clockwise rotation thereof will produce '30 clockwise rotation of the cross-shaft. It. will also appear obvious that. active transmission through one of the links I88 or I88 causes the other to overrun by reason of the slots therein. The cross-shaft is provided with one or more levers such as 288 which may be connected to causing relative axial movement between said , control levers on relative rotation thereof to en gage said disc and plate, means for operating one of the control levers, and means for permitting the other control lever to move in direct propor tion to the rotationof said‘plate. . ‘ 2. In a mechanical servo power brake, a fric tion disc driven from an automotive vehicle drive shaft and rotatable therewith, a friction plate en 30 the wheel brakes. In order that the extent gageable with said friction disc, means for trans of operation of the brakes may be “felt” at the mitting torque from said plate to wheel brakes, a foot pedal, the cross-shaft may be provided with pair of relatively rotatable levers coaxially ar another lever 284 which is connected by a link ranged with respect to said disc and plate, and 35 288 to the lever I 82,'so that follow-up lever l?t means for causing relative axial movement be-. 35 tends to follow the movement of operating lever tween said levers on relative rotation thereof to I88 connected to the usual foot pedal by a engage said disc and plate, and means interposed cable 288. ’ ' in said transmitting means and associated with The operation of either modi?cation should means for operating one of the levers to impose on said operating means a reactive force propor 40 be readily understood from “the foregoing de scription, and may be brie?y stated as follows. tional to the force transmitted by said torque The main transmission drive shaft is such that it always must rotate so long as the car is in motion and the drive wheels rotating, and hence the power take-o? cross-shaft geared direct transmitting means. movement in the control lever and its operating of said transmitting means. ‘ 4. In a mechanical servo power, brake, a brake 40 . 3. In a mechanical servo power brake, a fric tion disc driven from an automotive vehicle drive shaft and rotatable therewith, a friction plate en 45 thereto will always rotatewhen braking is de 'gageable with said friction disc, means for trans sired. By rotating‘the operating lever relative mitting torque from said plate to wheel brakes, a to the follow-up lever causes engagement of the. pair of relatively rotatable levers coaxially ar friction disc and plate to a more or less degree ranged with respect to said disc and plate, and 50 depending on the will of the operator, thereby means for causing relative axial movement be 50 setting up a torque in the friction plate tending tween said levers on relative rotation thereof to to cause rotation thereof. Through the suitable engage said disc and plate, means interposedin linkage set forth, this torque is transmitted to the said transmitting means and associated with means for operating one of the levers to impose . wheel brakes. The amount of movement and on said operating means a reactive force propor 55 in Figs. 3, 4,, 5 and 6 the amount of effort trans mitted to the wheel brakes is transmitted to the _ tional to the force transmitted by said torque operating lever so that movement and braking transmitting means, and meansfor moving the force will always givea proportional feel or other lever in direct proportion to the movement 60 foot pedal. ‘ - - , There has thus been described two embodi operating cross-shaft, a shaft rotatable in either ments of a mechanical servo power brake unit readily adapted for installation on the usual direction and adapted, to have varying degrees of torque applied thereto, oppositely extending automotive vehicle without necessitating rede levers on said torque shaft and connections there 65 sign or reorganization of the parts,‘ it being from to a lever on said cross-‘shaft, means for 65 merely, necessary to substitute certain parts and controlling the degree of torque in said torque apply a housing to the rear of the transmission. shaft, and means connected to a lever on the cross shaft for producing a movement in said con trolling means proportlon'al to the movement of Where the universal joint is moved rearwardly to accommodate this apparatus, the propeller shaft 70 is usually;v built of telescoping splined sections,‘ which may usually be conveniently telescoped to provide the extra room required.‘ “ _ the cross-shaft. . I r 70 5. In a mechanical servo power brake, a brake operating cross-shaft, a shaft rotatable in either Although two embodiments of the invention direction ‘and adapted to have varying degrees of has been illustrated and described, it ‘is to be torquev applied thereto, oppositely extending le P75 ‘understood that the invention is not to be limited vers on said torque shaft, a controlling lever for 75 4 2,127,740 controlling the degree of torque in said torque shaft, a connection from one of said oppositely extending levers to a cross-shaft lever, a second connection from the other oppositely extending lever through a floating lever‘ to the cross-shaft lever, and a connection from the ?oating lever to connections having a ‘floating lever interposed therein, said lever being connected to one of said pair of relatively rotatable levers, and means for operating the one of said pair of levers connected to the ?oating lever. ' 10. In a mechanical servo power brake, a torque operating cross-shaft, a shaft rotatable in either direction and adapted to have varying degrees of shaft having a slidable friction plate splined thereon, a stationary housing for said torque shaft forming a support therefor, a sleeve around said shaft threaded in said housing and forming 10 torque applied thereto, oppositely extendingv le an adjustable thrust abutment, and an axial said controlling lever. _ 6. In a mechanical servo power brake, a brake vers on said torque ‘shaft, a pair of relatively ro tatable levers, relative rotation between which controls the degree of torque in said torque shaft, overrunning connections from said oppositely ex tending levers to a cross-shaft lever and a con nection from a lever on the cross-shaft to one of said relatively rotative levers. '7. In a mechanical servo power brake, a brake operating cross-shaft, a shaft rotatable in either direction and adapted to have varying degrees of thrust producing means adapted to bear against said sleeve and move said friction plate. 11. In a mechanical servoI power brake, a ve hicle driven power shaft having a friction disc 15 splined thereon, means for moving the friction disc axially into engagement with a relatively stationary rocking torque plate, a pair of crank pins on said plate disposed at an obtuse angle from each other, a brake operating cross shaft 20 torque applied thereto, oppositely extending le closely adjacent said plate and having a lever with pivots thereon, and links with overrunning vers on said torque shaft, a pair of relatively ro slots connecting said lever pivots with each of _ , tending levers to a cross-shaft lever, a connection from a lever on the cross-shaft to one of said rel brake operating means, a rotational source of power, means for deriving a torque from said tatable levers, relative rotation between which said pins, said links extending in a tangential di controls the degree of torque in said torque shaft, . rection from their respective pivots and pins. 12. In a mechanical servo power brake, a wheel overrunning connections from said oppositely ex atively rotative levers. and means for operating .the other lever. B. In a mechanical servo power brake, a brake. - operating cross-shaft, a shaft rotatable in either means and said operating means for assuring a torque applied thereto, oppositely extending le movement of said control means directly propor tional to the movement of said operating means, and means independent of said ‘torque deriving means for assuring a constant ratio between ‘the force applied to the control means and the force transmitted from the source of power to the op vers on said torque shaft, a pairof relatively ro vers and a brake cross-shaft lever, one of said connections having a ?oating lever interposed therein, said lever being connected to one of said ’ pair of relatively rotatable levers, and a connec uon from the other of said pair of levers to a lever on said cross-shaft. ' . i . - I. ‘In a mechanical servo power brake, a brake operating cross-shaft, a shaft rotatable in either direction and adapted to have varying degrees of torque applied thereto. oppositely extending le vers on said torque shaft, a pair of relativelyv ro 50 trolling the amount of torque derived from said source and meansassociated with said control direction and adapted to have varying degrees of tatable levers. relative rotation between which controls the degree of‘torque in said torque shaft, connections between said oppositely extending le 40 source of power and for actuating said wheel brake operating means, control means for con 30 erating means. ' , trolling the amount of torque derived from said source and means independent of said torque de riving means and associated with said control means and said operating means for assuring a tatable .levers. relative rotation between which constant ratio between the force applied to the oonnectionsbetweensaid oppoaiteiyextending le the source of power to the operating means. controlsthedeareeoftorqueinsaidtorqueshaft, controlling means and the force transmitted from versand-abrakemahaftlevenoneofsaid 40 13. In a mechanical servo power brake, a wheel brake operating means, a rotational source of power, means for deriving a torque from said source of power and for actuating said wheel brake operating means, control means for con 45 ‘ LUDGEB E. LA BRIE.