US2152570A - Braking device - Google Patents

Description

March 28, 1939.

C. E. SCATES BRAKING DEVICE Filed June 2, 1958 I Illl Patented Mar. 28, 1939 PATENT lol-FICE 2,152,570 BEARING DEVICE Charles E. Scates, Hueneme, Calif.

Application June 2, 1938, Serial No. 211,458 4 claims. (cl. isa-92) This invention relates to an improved brake system adapted to operate on a rotary shaft.

It is an object of this invention to provide a brake adapted to be connected to the driven shaft r, of a motor and adapted to be manually actuated to control the speed of rotation of the driven shaft of a motor and the elements driven thereby.

More particularly, it is an object of this invention to provide a device adapted to be used on lo trucks or the like as an auxiliary brake, and to be connected to the main drive shaft whereby the speed of the truck may be checked by controlling the rotation of said shaft without the use of the conventional truck brakes. l More particularly it is an aim of this'invention to provide a iiuid pump adapted to be driven by a rotary shaft to impel liquid through a pipe line having means to control the passage of the liquid therethrough to create a back pressure to control the rotation of said shaft.

A particular advantage of this invention resides in the fact that in accordance with this construction the device will operate regardless of the direction in which the driven shaft is being turned ,to brake the speed of rotation of said shaft by the manual operation of a valve.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing which illustrates a preferred form of the invention, and

wherein:

Figure 1 is a side elevational view of the brake apparatus, and

Figure 2 is a vertical central sectional view of the same showing the pump casing partly in elevation.

Referring more particularly to the drawing wherein like reference characters designate like or corresponding parts throughout the different views, I designates generally a container adapted to contain any suitable brake fluid II as indicated by the dotted line in Figure 2.

A pipe line designated generally I2 has the two depending passages I3 and I4 extending downwardly and opening into the brake :duid II, the enlarged passages I5 and I6 disposed directly above passages I3 and I4 respectively, the upper passage I'I communicating at its opposite ends with corresponding ends of the passages I5 and I6 and the passage I8 disposed beneath passage I'I and likewise communicating at its opposite ends with passages I5 and I6.

A pump casing designated generally I9 is mounted in the pipe I8 intermediate of its ends 2,0 and 2I being connected to and communicating 'withthe pipe ends I8. Casing I9 is provided with the arcuately shaped ends 22 and 23 disposed above and beneath and substantially at right angles to the passage I8. Journaled in end 22 is an impeller or pump gear 24 and in end 23 is 5 a corresponding gear 25, gears 24 and 25 having their teeth 26 in mesh as seen in Figure 2. Yi driven shaft 21 such as the main drive shaft of an internal combustion engine, not shown,` extends through the container I0 and through 10 end 22 of casing I9 and has the gear 24 keyed thereto and adapted to be rotated thereby to rotate the gear 25, which is keyed to a stub-shaft 28 journaled in end 23.

Extending upwardly from the intermediate por- 15 tion of passage I 'I is an outlet 29 hav'mg a restricted portion 30 provided with a valve seat 3| and a pipe 32 formed integral with outlet 29 and communicating therewith. Pipe 32 is Aprovided with an enlarged portion 33 in which is remov- 20 ably mounted a housing 34 for a valve stem 35 adapted to be actuated by a hand wheel 36 to move a valve 31 into and out of engagement with Valve seat 3l. Pipe 32 has a depending portion 38 extending into container IIJ and opening into 25 the brake fluid II as best seen in Figure 2. One end of a U-shaped pipe line 39 is mounted in pipe 32 directly above th depending portion 3 8, and the opposite end is mounted in container I0 adjacent its bottom as seen at 40. Pipe line 39 30 is formed of sections, the free ends of which connect with a cooling unit or radiator 4I.

Passage I5 and I6 of the pipe line I2 are provided with the corresponding restricted portions forming valve seats, and designated 42 and 43. 35 Valve seats 42 are disposed at the lower end of the passages I5 and I6 and the valve seats 43 at the upper ends of said passages to receive the spherical shaped valves 44, 45, 46 and 41 which are normally seated by gravity in thevalve seats 40 42 and 43. Valves 44 and 45 are held in position by the cages 48 and the valves 46 and 41 are held in position by the cages 49, said cages being spaced sufficiently from the valve seats to permit the Valve to open as will hereinafter be described. 45 Pipe line I2 is provided with the removable plugs 50 at either end of the passage I1 for access to the interior of the pipe line. A small bored pipe 5I is removably mounted in the passage I1 in communication therewith and extends, upwardly 50 therefrom to have a pressure gauge 52 connected to its free end to indicate the iuid pressure in the passage I'I.

The operation of the auxiliary brake device is as follows: the impeller gears 24 and 25 are re- 55 volved in opposite directions, as indicated by the arrows 53, by the driven shaft 21 to pump the brake fluid II through the pipe line I2. When gear 24 is rotated in a clockwise direction to revolve gear 25 in a counterclockwise direction, as indicated by the arrows 53, a suction will be created in side 20 of casing I9 to open valve 44, as seen in Figure 2, to permit the fluid Il tc be drawn through inlet I3 valve seat 42 and into the side 20 of casing I9, where the fluid will be pumped around the ends 22 and 23 of the casing by gears 24 and 25 respectively, and out through side 2l, up through passage I6 to open valve 46 so that the fluid may pass into passage I1 and through outlet 29. Valves 45 and 41 will be closed s0 that the fluid can not pass back into inlet I4 or passage I5, but will be directed through the restricted portion 30 into pipe 32 and, down through passage 38 or through the pipe line 39 back to the casing at the point 40. If the direction of rotation of shaft 21 is reversed,.gears 24 and 25 will turn in the opposite direction to draw the fluid in through inlet I4 and the valves 45 and 41 will be opened while valves 44 and 46 will close so that the fluid will pass in through side 2| and out through side 20 of casing I9 after having passed around the interior of ends 22 and 23 and then through passage I5 and valve seat 43 to passage I1 and outlet 29. Valve 31 will normally be open so that therewill be very little resistance to the rotation of gears 24 and 25, but when it is desirable to check the speed of shaft 21 valve 31 may be closedv or partly closed to build up a/pressure' in passage I1 and` tended for use on trucks with the device mounted behind the transmission of the truck with `the main drive shaft thereof keyed to the gear 24 to revolve it in either a clockwise or counterclockwise direction. Gauge 52 would be mounted in the dash board and .hand wheel 36 positioned to be readily accessible to the operator of the truck so that the device could be used to check the speed of the truck, while in gear, thereby saving wear on the conventional wheel brakes. The radiator 4I would be positioned in front of the truck so that the fluid passing through pipe line 39 could be cooled before returning to container I0. Obviously, other means for operating valve 31 could be substituted for the hand wheel 36, if desired, so that the brake could be actuated more rapidly thereby adapting it for use as a primary brake rather than an auxlliary brake to the conventional wheel brakes. As heretofore described; the brake may be actuated regardless of the direction in which the shaft 21 is turning so that the device will function regardless of whether the truck is moving forward or backward.

Othermodifications and changes in the invention may obviously be made and are contemplated and the right is reservedto make such variations and changes as do not depart from the spirit and scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

1. A brake system' comprising a pipe line having spaced perpendicularly disposed passages opening at their lower ends, spaced horizontal passages communicating with said perpendicular passages, a pump casing mounted in the lower horizontal passage, rotary impeller gears mounted in said pump casing having their teeth in mesh, one of said gears adapted to be keyed to a driven shaft, a common outlet communicating with the intermediate portion of the upper horizontal passage, and ball valves mounted in said perpendicular passages and seating beneath the opposite ends of said horizontal passages, said gears drawing a braking fluid through one of said open ends to unseat the valve at one end of the lower horizontal passage to permit the fluid to be impelled through the pump casing and upwardly through the other perpendicular passage to unseat the valve at the top thereof- 20 to permit the fluid to pass outwardly through said outlet, a shut-off valve mounted' in said outlet and adjustable to build up a pressure in said pipe line to resist the rotation of said impeller gears, means for returning the fluid from said outlet to the pipe line, and means for cooling a portion of said fluid as it is returned to the pipe line.

2. A hydraulic brake for driven shafts comprising a container adapted to be partially filled with a brake fluid, a pipe system including spaced perpendicular pipe sections, spaced horizontal pipe sections connecting said perpendicular pipe sections at their tops and intermediate of their ends, the lower ends of said perpendicular sections opening into the brake fluid, said perpendicular pipe sections having valve seats disposed beneath the ends of the horizontal pipe sections, b'all valves seating in said valve seats, said upper horizontal pipe section having a common outlet intermediate of its ends provided with a valve seat, a manually adjustable valve for said last mentioned outlet, said outlet having a return pipe communicating therewith and opening into said container; a pump casing disposed in the lower horizontal pipe section, meshing gears disposed in said pump casing, one of said gears being connected to a driven shaft whereby said gears will be driven in opposite directions thereby for opening one of the lower valves by suction to admit brake fluid to said pump casing, the brak'e fluid opening the upper valve at the opposite side of said pipe system so that the fluid may pass to said outlet and back through said return pipe to the container, said manually controlled valve being adjustable to limit the fluid passing through the outlet to create a back pressure in the pump casing for resisting the rotation of said driven shaft. l

3. A device as in claim 2, comprising means communicating with said return pipe and container for by-passing a portion of the brake fluid being returned to the container, and a radiator connected to said means for cooling the bypassed fluid.

4. A hydraulic brake comprising a gear casing, meshing gears disposed in said casing, one of said gears being adapted to be connected to and driven by a driven shaft for driving said gears in either direction, a pipe line communicating with opposite ends of said gear casing and provided with spaced depending open ends, a container for a brake fluid into whichsaid open ends extend, a common outlet for said pipe line, manually controlled valve means for said outlet,

and valves disposed in said pipe line above and beneath said gear casing and adapted to be alternately opened under pressure and suction, respectively, for conveying the braking uid from' said container through the-pipe line, a return pipe connected to seid outlet and opening into said. container for returning the brake fluid. thereto, and a cooling device connected to said return pipe and container whereby a portion of the brake uid being returned will be by-passed through said device tc be cooled, said manually controlled valve being adjustable to limit the opening of said outlet to create a back pressure in said pipe line and gear casing to resist the rotation of said gears and driven shaft.

CHARLES E. SCATES.

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