US2213948A

US2213948A - Fluid pressure actuated motor

Info

Publication number: US2213948A
Application number: US244080A
Authority: US
Inventors: Herbert C Bowen
Original assignee: Hydraulic Brake Co
Current assignee: Hydraulic Brake Co
Priority date: 1938-12-05
Filing date: 1938-12-05
Publication date: 1940-09-10
Anticipated expiration: 1957-09-10

Description

Patented Sept. 10,1940 a 2,213,948

UNITED STATES PATENT orrics 2,213,948 'r'wrn rnnssunn ACTUATEDMOTOB Herbert 0. Bowen, Detroit, Mich., asslgnor to Bydraulic Brake Company, Detroit, Mich, a corporation of California Application December 5, 1938, Serial No. 244,080 '1 Claims. (01. Gil-54.6)

This invention relates to brakes. and more parpassage 48 concentrically disposed with relation ticularly to fluid pressure means for actuating to both chambers. An inlet passage 48 adapted brakes. to be connected as by a conduit 50 to a suitable Broadly the invention comprehends a fluid source of fluid pressure communicates with the I pressure actuated -motor operative to actuate passage 48, and a passage 52 providing a come I brakes in two phases, initially at low fluid presmunication between the intake passage 48 and sure, and thereafter at relatively high fluid presthe large chamber 44 is controlled as by a check sure without proportionately greater applied opvalve 54. erating Iorce. The end of the passage 46 opening into the An object of the invention is to provide a chamber 44 is enlarged to provide an annular fluid pressure actuated motor operative in two shoulder, and seated on this shoulder is an anphases. nular washer 56. A shell 58 threaded in the en- Another object of the invention is to provide larged end of the passage clamps the annular a fluid pressure actuated motor including low washer on its seat. This shell extends well into pressure actuated means, high pressure actuated the chamber 44, and the free end thereof. is 1 means, and pressure actuated means for render-- closed as by a head 60 provided with a port 62, ing the lowpressure means ineffective during and suitably arranged in the wall of the shell operation of the high pressure means. w is a port 64 providing a communication-between Other objects and advantages of the invention 1 the interior of the shell and the chamber 44. will appear from; the iollowing'description taken A piston 66 reciprocable in the shell 58 is seat 20 in connection with the drawing forming a part ed on aheavy spring 68 interposed betweenthe of this specification, and in whichback of the piston and the head of the shell. A

Fig. l is a vertical sectional view of a brake rod Ill is mounted concentrically in the head of taken just back of the head of the drum, illusthe piston, and a sealing cup 12 seated on the trating the invention as applied; and head of the piston embraces the rod. The rod 25 Fig. 2 is a sectional view substantially on line extends through the shell, the annular washer 2-2, Fig. 1. 56, and the passage 46 intothe small chamber Referring to the drawing for more specific de- 42, and a valve 14 is carried by the rod for contails of the invention, I0 represents a fixed suptrol of the communication between the passage port or backing plate. adapted to be secured to 46 and the shell. The valve 14 is normally held 30 an axle or to an axle housing, and associated with on .a flexible seat 16 supported on the annular the backing plate is a rotatable drum l2 adapted washer 56. The rod also has thereon within to besecured to a wheel. the chamber 42 a valve 18 adapted'to seat on a The backing plate has suitably arranged there'- fiexible washer 80 on the bottom of the chamon a pair of spaced anchors l4 and i6 and a ber 42. j

pair of adjustable retractile stops I8 and 20. A A piston 82 reciprocable in the chamber 42 has pair of corresponding friction elements or-shoes on its head a sealing cup 84. A light spring 86 22 and 24 have their'articulate ends pivoted on interposed between the cup 84 and the washer the anchors l4 and I6, and their force applying 80' serves to retain the cup andwasher 80 against ends normally rest on the adjustable stops I8 and displacement. The piston 82v also has a flange 4o 20. The shoes are of conventional type, each in- 81 adapted to abut the cylinder when he p cluding a web 26 supporting a rim 28 having setonis at rest so as to fix the retracted'position cured thereto a friction lining 3!! suitable for thereof, and arranged in the back of the piston is cooperation with the drum. a recess 88 for the reception of the thrust pin A compound fluid pressure actuated motor 32 34, and a dust shield 90 connects the thrust pin 45 slidably mounted on the backing plate is c'onto the open end of the chamber 42. nected as by

thrust pins

34 and 38 to the force A piston 92 reciprocable in the chamber 44 applying ends of the shoes, and a retractile spring has a concentric recess 94 receiving the shell 38 connecting the shoes adjacent their force ap- 58, and a port 96 in the bottom of the recess so plying end servesto return the shoes upon comopens to the atmosphere. The piston 92'has on pletion of a braking operation to their retracted its head an annuar sealing cup 98 embracing the positions on the stops l8 and 20. wall of the chamber and the shell 58, and the The motor 32 includes a cylinder 40 having a cup is held against displacement by a spring I00 small chamber 42 and a relatively largechaminterposed between the cup and the bottom of 5 her 44 communicating with one another as by a the chamber. The piston 92 alsdhas in its back 66 V t e fluid, the valve 14 cracks and admits enters the passage 48, thence passes through the passage 46, past the valve 18, into the chamber 42, resulting in an increase of pressure on the.

fluid in the chamber 42 and consequent movement of the piston 82 and the cylinder 40 in opposite directions. This movement of the piston and the cylinder efiectively moves the

shoes

22 and 2 into engagement with the drum l2.

Upon attaining a predetermined pressure1 or;

in der pressure into the shell 58, thence through t e port 64, into the chamber 44. As the pressure on the fluid in the shell 58 and the chamber 44 builds up, the valve 18 moves to its seat and closes off communication between the chamber 42 and the passage 46. This results in trappingfluid in the chamber 42 and thereafter the-pressure on the fluid acting on the piston 66 and on the head of the valve 18 maintains the valve 18 closed while the pressure on the fluid in the chamber 44 acting, on the piston 92 causes further movement of the piston 92 and movement of the cylinder 40 in the opposite direction, resulting in.

applying the shoes with increased force and less efiort on the part of the operator.

Upon concluding a braking operation, pressure on'the fluid is released, whereupon the valve 14 is urged to its seat by the spring 68, and the valve 18 opens to establish communication between the chamber 42 and the passage 46. This results in opening the chamber 42 directly to the inlet passage 48, and return of thefluid from the chamber 42 to the source of supply, and the fluid in the chamber 44 is displaced therefrom past the check valve 54 to the source of supply.

While this invention has been described in connection with certain specific embodiments, the

principle involved is susceptible of numerous other applications that will readily occur to persons skilled in the art. The invention is, therefore, to be limited only as indicated by the scope of theappended claims.

Having thus described the various features of the invention, what I claim as new and desire to secure by Letters Patent is:

1. A fluid pressure actuated motor comprising a floating cylinder having a small chamber and a relatively large chamber arranged in spaced relation to one another, a passage connecting the chambers and an intake port communicating with the passage, a piston reciprocable in each of the chambers, and a double end valve in the passage'normally open to establish communication between the small chamber and the passage and to close communication between the large chamberand the passage and operative under a predetermined pressure to close communication between the small chamber and the passage so as to trap 'fluidin the small chamber and to establish communication between the large chamber and the passage. v

2. A fluid pressure actuated motor comprising a floating cylinder'having a small chamber and a relatively large chamber, a passage connecting the chambers and an inlet port communicating with'the passage, a piston reciprocable in each of the chambers, and valve mechanism in the passage operative upon attaining a predetermined pressure to close communication between the small chamber and the passage so as to trap fluid in the small chamber and to establish communication between the large chamber and the passage.

3. A fluid pressm'e actuated motor comprising a shiftably mounted cylinder having a small chamber and a relatively large chamber, a passage connecting the chambers and a fluid inlet communicating with the passage, a piston reciprocable in each of the chambers, and a fluid pressure actuated valve for control of the passage operative upon attaining a predetermined pressure to close communication between the small chamber and the passage so as to trap fluid in the small chamber and to establish communication between the large chamber and the passage.

4. A fluid pressure actuated motor comprising a shiitably mounted cylinder having a small chamber and a relatively large chamber, a passage connecting the chambers and an intake port communicating with the passage, a controlled passage between the intake port and the large chamber, a piston reciprocable in'each of the chambers, and a fluid pressure actuated valve for control of the passage connecting the chambers operative upon attaining a predetermined pressure to close communication between the small chamber and the passage so as to trap fluid in the small chamber and to establish communication between the large chamber and the passage.

5. A fluid pressure actuated motor comprising a shiftably mounted cylinder having a small chamber and a relatively large chamber and a passage connecting the chambers, an intake passage communicating with the passage connecting the chambers, a controlled passage connecting the intake passage to the large chamber, a piston reciprocable in each of the chambers, and a springpressed fluid actuated double-end valve for control of the passage connecting the chambers operative upon attaining a predetermined pressure to close the small chamber and. open the large chamber.

6. A fluid pressure actuated motor comprising a floating cylinder including a small chamber, a relatively large chamber arranged in spaced concentric relation to the small chamber, a passage connecting the chambers, a fluid inlet communicating with the passage and a controlled passage connecting the inlet with the large chamber, a piston reciprocable in each of the chambers, a double-end valve in the passage having a part subjected to the initial pressure on the fluid in the motor tending to close communication between the small chamber and the passage and to establish communication between the large chamber and the passage, and another part subjected to pressure on the fluid in the small chamber upon closing the communication between the small.

chamber and the passage.

'7. A fluid pressure actuated motor comprising a floating cylinder having a. small chamber, a relatively large chamber, a passage connecting the chambers, a fluid inlet communicating with the passage and a controlled passage connecting the inlet to the large chamber, a piston reciprocable in each of the chambers, a double-end valve in the passage for control of communication between the small and large chambers with the passage, and a spring-pressed piston attached to the valve and arranged in concentric relation to the piston complementary to the large chamber and exposed to pressure in the large chamber.

HERBERT C. BOWEN.