US3759283A

US3759283A - Vibration producing apparatus

Info

Publication number: US3759283A
Authority: US
Inventors: T Maeda
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-12-10
Filing date: 1971-11-29
Publication date: 1973-09-18
Anticipated expiration: 1990-09-18

Abstract

A vibration producing apparatus comprising a frame, a cylindrical space formed in said frame, a fluid supply port communicating with said cylindrical space, a vibratory member mounted in said cylindrical space for angular rotation, and two shield projections disposed at positions diametrically opposed to each other on an outer peripheral surface of said vibratory member and extending in opposite directions into sliding engagement with an inner peripheral surface of said cylindrical space. A vibration producing apparatus further comprises means for causing one of said shield projections to be disposed on the fluid supply port side and precluding angular rotation of said vibratory member over and above a predetermined angle, and ports adapted to maintain communication with said cylindrical space outside the range of movement of the other shield projection of said vibratory member.

Description

United States Patent 1 Maeda 3,759,283 [451 Sept. 18,1973

1 1 VIBRATION PRODUCING APPARATUS [76] Inventor: Teruyuki Maeda, 6-5, Kita-machi,

3-chome, Kichijoji, Musashino City, Tokyo, Japan [22] Filed: Nov. 29, 1971 21 Appl. No.: 202,861

[30] Foreign Application Priority Data Sept. 10, 1971 Japan 46/69764 Dec. 10, 1970 Japan 45/109891 [56] References Cited UNITED STATES PATENTS 264,975 9/1882 Nerden 91/339 212 9/ 2 Reynolds 91/ 3, ,250 12/ 9 Toby 91/ Primary Examiner-Paul E. Maslousky Attorney-Davidson C. Miller et a1.

[57] ABSTRACT A vibration producing apparatus comprising a frame, a cylindrical space formed in said frame, a fluid supply port communicating with said cylindrical ce, avibratory member mounted in said cylindric pace for angular rotation, and two shield projections disposed at positions diametrically opposed to each other on an outer peripheral surface of said vibratory member and extending in opposite directions into sliding engagement with an inner peripheral surface of said cylindrical space. A vibration producing apparatus further comprises means for causing one of said shield projections to be disposed on the fluid supply port side and precluding angular rotation of said vibratory member over and above a predetermined angle, and ports adapted to maintain communication with said cylindrical space outside the range of movement of the other shield projection of said vibratory member.

4 Claims, 3 Drawing Figures PATENTEU 86H 8 I975 SHEET 1 BF 2 FIG./

PAIENIED SHEET 2 UP 2 FIG.

VIBRATION PRODUCING APPARATUS This invention relates to a vibration producing apparatus which relies on hydraulic pressure for producing vibration.

Hitherto, there have been several types of vibration producing apparatus available for various purposes. In one type of mechanical vibration producing apparatus known in the art, an eccentric cam and other elements are used. Such apparatus have disadvantages in that adjustments of amplitudes of vibrations are not possible, and the apparatus require high mechanical rigidity and a large space for installation because their size is considerably great. Besides, the apparatus do not lend themselves to selectively causing any particular point to vibrate as required.

There are also electrically operated vibration producing apparatus. Such apparatus are capable of producing vibration at high frequency but not capable of developing a high output at a high amplitude. Vibration producing apparatus relying on internal combustion engines or pneumatic pressure devices give off large noises when exhausts are vented, thereby making a public nuisance of themselves. Vibration producing apparatus using a servo-valve of the electrohydraulic systern are capable of developing a high output at high precision but high in cost. Such apparatus are used only in laboratory and not fit for practical use.

This invention obviates the aforementioned disadvantages of the vibration producing apparatus of various types of the prior art.

Accordingly, this invention has as its object the provision of a vibration producing apparatus of the fluid pressure type which causes a vibratory member to vibrate in self-oscillation by hydraulic means.

Other and additional objects of the invention are those inherent in the invention hereinafter shown, described and claimed and will become evident as the description proceeds.

in the drawings:

FIG. 1 is a vertical sectional view of the vibration producing apparatus comprising one embodiment of this invention;

FIG. 2 is a sectional view taken along the line X-X of FIG. 1; and

FIG. 3 is a sectional view of the apparatus comprising another embodiment.

In FIG. l and FIG. 2, the numeral 1 designates a frame of the vibration producing apparatus A which is formed at one end thereof with a cylindrical space 2 and a bearing housing recess 4 contiguous with each other with an ofiset portion 3 being formed therebetween. A fluid supply port 5 is formed at one side of an outer periphery of frame 1 to communicate with cylindrical space 2, and

ports

6, 6a, 7, 7a, 8 and 8a communicating with cylindrical space 2 are formed at a side of the outer periphery of frame 1 which is opposite to the side at which fluid supply port 5 is located.

Ports

6, 6a, 7, 7a, 8 and 8a are disposed symmetrically relative to each other with respect to a diametrical line passing through the center of frame 1 and fluid supply port 5.

Throttle valves

9 and 9a are mounted midway in ports 6 and 6a respectively, and adjusting rods 10 and Ma are slidably mounted in ports 7 and 70 respectively for movement into and out of cylindrical space 2.

The numeral iii designates a vibratory member comprising a discal portion 12 which is of a diameter greater than the diameter of bearing housing recess 4 but smaller than the diameter of cylindrical space 2 Discal portion 12 is formed, at positions on the outer periphery thereof whichare diametrically opposed to each other, with

shield projections

13 and 14 maintained in sliding contact at their front ends with an inner peripheral surface of cylindrical space 2. Discal portion 12 is also formed with shafts H5 and 16 integral with discal portion 12 and projecting upwardly and downwardly respectively.

The upper shaft i5 is rotatably journalled by a bearing l7 which is fitted in bearing recess 4. A cover 18 includes a columnar projection 19 which is fitted in cylindrical space 2, and the lower shaft 16 of vibratory member 11 is journalled by a bearing 22 which is fitted in a bearing recess 20 formed in columnar projection 19.

The cylindrical space 2 of frame ll, the discal portion 12 of vibratory member ll 1, the columnar projection 19 of cover 18, and the

shield projections

13 and 14 of vibratory member 11 define therebetween left and right

arcuate spaces

22 and 23. Two stoppers 24 and 24a are attached to one side of an upper surface of columnar projection 19 and disposed at the side opposite to the side of frame I at which fluid supply port 5 is disposed. One shield projection 14 of vibratory member ll 1 is disposed between two stoppers 24 and 24a.

The columnar projection 19 of cover 1% is formed with

ducts

25 and 25a maintained in communication left and right

arcuate recesses

22 and 23 respectively.

B designates a fluid power amplifying apparatus provided with a frame 26 formed with a cylindrical bore 27 receiving therein a spool valve 311 formed with

lands

29, 28 and 30 at a center and opposite ends thereof respectively.

Springs

32 and 33 are mounted on opposite ends of spool vave 31, and cylindrical bore 27 is closed by a cover 34.

Spool valve 31 divides cylindrical bore 27 into a left chamber 35 and a right chamber 350 which are maintained in communication with the

ducts

25 and 25a formed at the arcuate spaces of vibration producing apparatus A through ducts a4 and 44a respectively which are formed in frame 26. Frame 26 is also formed therein with a fluid outlet duct 36 which is connected to cylindrical bore'27 between the

spool lands

28 and 30 at the opposite ends of spool valve 31. A high pressure fluid supply duct 37 connected at one end to a high pressure fluid source is connected at other end to the central portion of cylindrical bore 27. Bent ducts 38 and 380 are formed in frame 26 and connected at one end to a portion of cylindrical bore 27 between the

spool lands

28 and 29, and 29 and 30 at the opposite ends of spool valve 31.

C designates an output producing apparatus formed with a cylindrical bore 39 receiving therein a piston 40 supported by rods 41 and Ma integrally connected to opposite ends of piston 40 and extending out of output producing apparatus C to serve as an output shaft. Apparatus C is formed therein with

ducts

43 and 43a which maintain a left chamber 42 and a right chamber 42a of cylindrical bore 39 divided by piston 4th with the other end of bent ducts 38 and 380 formed in apparatus 8.

Operation of the vibration producing apparatus constructed as aforementioned will now be described. The fluid under pressure supplied through fluid supply port 5 passes into right arcuate space 23 shown in FIG. 2

and is discharged through duct 8a. This flow of fluid under pressure acts on one shield projection 14 and moves the same clockwise in FIG. 2 by the energy of the fluid, so that vibratory member lll angularly rotates clockwise in FIG. 2 till shield projection 14 strikes against one stopper 24 and is stopped thereby.

At this time, the other shield projection 13 of vibratory member llll is disposed rightwardly of fluid supply port in FIG. 2, so that the fluid under pressure introduced through port 5 into the apparatus A passes into left arcuate space 2.2 in H6. 2 and is discharged through port 8. This flow of fluid under pressure acts on shield projector l4 and moves the same counterclockwise in FIG. 2 by the energy of the fluid, so that vibrator member ill angularly rotates counterclockwise in Fl'G. 2 till shield projection 14 strikes against the other stopper 24a and is stopped thereby.

This process is repeated over and over again so that vibratory member il moves in vibratory motion.

The quantity of fluid under pressure introduced into left and right

arcuate spaces

22 and 23 can be adjusted by moving backwardly or forwardly adjusting rods lb and ltla or turning

throttle valves

9 and 9a so as to set the number of vibrations of vibratory member til at any level as desired.

If fluid under pressure is supplied to the vibration producing apparatus A as aforesaid to cause the vibratory member if to vibrate, fluid pressure of left and right

arcuate spaces

22 and 23 are applied respectively through

ducts

25 and 25a to the cylindrical bore 27 of the fluid power amplifying apparatus B, so as to move spool valve 31 to right and left.

Fluid under high pressure is supplied through high pressure fluid supply duct 37 to cylindrical bore 27 when spool valve 31 is moving to left and right as aforementioned. Thus, when a quantity of fluid under pres sure is supplied to the right arcuate space 23 of the vibration producing apparatus A and introduced into the right chamber 35a of the cylindrical bore 27 of the fluid power amplifying apparatus B so as to move spool valve 31 to left, a quantity of fluid under high pressure passes through a space in bore 27 between the spool lands 29 and 3b of spool valve 31 and ducts 38a and @311 into the right chamber 42a of the cylindrical bore 39 of the output producing apparatus C, so that piston oh and piston rods 41 and 41a move to left as a unit.

On the other hand, when a quantity of fluid under pressure is supplied to the left arcuate space 23 of the vibration producing apparatus A and introduced into the left chamber 35 of the cylindrical bore 27 of the fluid power amplifying apparatus B so as to move spool valve 31 to right a quantity of fluid under high pressure passes through a space in bore 27 between the

spool lands

23 and 29 of spool valve fill and ducts 3b and 43 into the left chamber d2 of the cylindrical bore 39 of the output producing apparatus C, so that piston so and piston rods lll and dis move to right as a unit.

FIG. 3 shows a modified form of the vibration producing apparatus A according to this invention. The apparatus of FlG. 3 is substantially similar in construction to the apparatus shown in FIG. l and F16. 2. except for the fact that the former is provided with two

fluid supply ports

5a and 5b connected to a cylindrical space formed in frame ll instead of the fluid supply port 5 of the latter which fluid supply ports 5a and 51'; may be of any shape as desired and disposed at any angle 9 with each other. The provision of fluid supply ports $12 and Sb permits vibratory member if to continuously move in self-oscillation without the aid of stoppers 2d and 2411. Combined with the aforementioned hydraulic pressure increasing apparatus 5 and the output producing apparatus C, the vibration producing apparatus formed with fluid supply ports as shown in Fit 3 can function in the same manner as the apparatus shown in FIG. 3 and FIG. 2.

Operation of the apparatus shown in H6. 3 wil now be described. When a right end of one shield projection 13 of vibratory member illl passes on one fluid supply port 51; in its counterclockwise angular movement, the area of the port 5b communicating with chamber 23 varies with time, so that vibratory member it receives a supply of energy of vibration from the fluid (or subjected to negative damping in an academic term) and angularly rotates counter clockwise. if the right end of shield projection i3 is released from engagement with fluid supply port 5b by the angular rotation of vibratory member ill, then no energy of vibration is supplied to vibratory member ill because there is no change in the area of port Sb with time, so that vibratory member M is only moved by inertia. This movement of vibratory member ii is damped by the hydraulic pressure ap plied to shield projector 34 and the force of viscous resistance exerted thereon, so that vibratory member ll stops in a position shown in FIG. 3. Since hydraulic pressure is applied to the shield projection 14 of vibratory member Ill now standing still, vibratory member llll is pushed back to move clockwise. This opens the other fluid supply port 5a, and the aforementioned process is repeated. As a result, the embodiment of the vibration producing apparatus A shown in FllG. 3 can function satisfactorily without using the stoppers.

In the embodiment shown in FIG. 3, two limiters dd and 4140 may be provided on an upper surface of columnar projection T9 to project upwardly therefrom so that one shield projector lid may be interposed between the two

limiters

44 and 44a. The provision of such limiters is effective to prevent vibratory member Ill from being disposed in an undesirable position when it stands still. The limiters 34 and dda are positioned such that they are spaced apart from each other as much as possible and yet they can prevent the two fluid supply ports from communicating with each other through

arcuate space

22 or 23.

Thus, the piston rods 4i and dla or output shaft of the output producing apparatus C will be caused to move in vibratory motion by high pressure fluid at the same number of vibrations as the vibratory member iii of the vibration producing apparatus A for operating a vibrating screen, vibratory feeder, vibratory pile-driver, vibratory tarnping machine and the like.

From the foregoing description, it will be appreciated that the vibration producing apparatus according to this invention is simple in construction and yet capable of causing a vibratory member to vibrate in selfoscillation by a spring force of fluid. The apparatus can readily vary the number of vibrations of the vibratory member by effecting adjustments of the flow rate of fluid. if the fluid amplifying apparatus and the like can be driven by the vibratory motion of the vibratory member, it will be possible to employ this vibration producing apparatus in a wide range of operation machines.

What is claimed is:

1. A vibration producing apparatus comprising a frame, a cylindrical space formed in said frame, a fluid supply port communicating with said cylindrical space, a vibratory member mounted in said cylindrical space for angular rotation, two shield projections disposed at positions diametrically opposed to each other on an outer peripheral surface of said vibratory member and extending in opposite directions into sliding engagement with an inner peripheral surface of said cylindrical space, means for causing one of said shield projections to be disposed on the fluid supply port side and precluding angular rotation of said vibratory member over a predetermined angle, fluid discharge ports adapted to maintain communication with said cylindrical space outside the range of movement of the shield projections of said vibratory member, and output ports adapted to maintain communication with said cylindrical space outside the range of movement of the shield projections of said vibratory member in order to take out a fluid pressure from the cylindrical space as an output.

2. A vibration producing apparatus as defined in claim 1 wherein said means for precluding angular rotation of said vibratory member over and above a predetermined angle comprises a pair of stoppers faced to opposite sides of the other shield projection of said vibratory member.

3. A vibration producing apparatus as defined in claim 1 wherein said fluid supply port is formed as a plurality of inclined fluid supply ports maintained in communication with the cylindrical space formed in the frame.

4. A vibration producing apparatus as defined in claim 1 wherein said fluid supply port is formed as a plurality of inclined fluid supply ports maintained in communication with the cylindrical space formed in the frame, and said means for precluding angular rotation of said vibratory member over and above a predetermined angle comprises a pair of limiters for regulating the angular rotation of the vibratory member such that the two inclined fluid supply ports are prevented from communicating with each other through one of arcuate spaces formed by dividing the cylindrical space by the two shield projections of the rotary member.