JPH0248763B2 - NISOKUDOBENOYOBINIHOKOMOOTASOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a two-speed valve and two-way motor arrangement capable of operating at two speeds in at least one direction, particularly to avoid excessive pressure during movement. The present invention relates to a two-way motor system and a two-speed valve that can be moved without any interference and which are extremely safe for personnel and equipment.

DESCRIPTION OF THE PRIOR ART Bidirectional motor systems are well known in the art and are used in particular in the actuation of winches in lifting equipment, such as cranes. In such winches, it is common for the winch drum to be driven by two hydraulic motors with a common shaft, and the hydraulic motors are bidirectional for lifting and lowering operations. It is configured such that during descent operations, all fluids can be circulated through a single motor to enable high speed operation, or can be diverted for low speed operation. However, such devices had a number of problems. For example, Japanese Patent Application Laid-Open No. 49-307678 discloses a hydraulic motor device that is equipped with a pair of hydraulic motors and drives a winch at high or low speed for lifting and lowering cargo. Disclose.

However, this hydraulic motor device simply shuts off the hydraulic circuit to one hydraulic motor using the high/low side switching valve, and adjusts the rotational speed of the other hydraulic motor. Furthermore, for example, Japanese Patent Application Laid-Open No. 49-73584
No. 1 also discloses a hydraulic motor device for driving a winch at high or low speeds using a double motor having a common shaft, but the hydraulic motor device also has the ability to It is merely configured to actuate the sequence valve, which then automatically actuates the hydro-switching valve to simply shut off or open the hydraulic circuit for one of the hydraulic motors.

In this way, both of the above two conventional technologies have a method of cutting off the hydraulic circuit to one motor in order to transition from low-speed operation to high-speed operation, so communication is made only with the interrupted hydraulic circuit. Because it is coaxial with the other high-speed rotating motor in the motor housing, the motor rotating at the same speed becomes a pump and continues to generate high pressure within the housing, which may destroy the housing or shorten the life of the drive device. may be significantly reduced. This not only shortens the life of the equipment but also increases costs.
Furthermore, this poses a problem of increasing the danger to workers.

Furthermore, the hydraulic motor device shown in Utility Model Application Publication No. 51-45629 controls two hydraulic motors using a switching valve equipped with a spool valve that slides inside. The switching valve simply shuts off or communicates one hydraulic circuit, and the fluid directional switching valve is fitted and fixed inside the spool, and the poppet fitted to the valve is connected to the two motors. This is to prevent the hydraulic circuit of the motor on the non-operating side from temporarily closing during the process of switching the operation of the motor to the operation of only one motor, thereby preventing surge pressure from occurring. Therefore, when the switching process is completed and only one motor is in high-speed operation, the motor rotating at the same speed as the operating motor on the non-differential side becomes a pump and the high pressure generated in the housing. has not been solved before.

These problems mentioned above have existed for many years without a serious solution, and their solution has depended on skilled workers and the performance of excellent winch drum brakes.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a two-way motor device that solves the problems of the prior art devices as described above.

Arrangements and Effects of the Invention In accordance with the invention, (a) there is provided a pair of bidirectional motors having a common axis; (b) receiving fluid from a source of pressurized fluid and directing the fluid to a second motor of the motor; (c) between said directional valve means and the first side of said two motors; a counterbalance valve at and on a first side of the two motors; (d) for selectively distributing fluid from the directional valve means to the second side of at least one of the two motors; a first position, the two-speed valve means distributing the fluid equally between the two motors to provide low-speed rotary motion;
said two-speed valve means having a second position offset from said first position for distributing all of said fluid to one motor for high speed rotational movement; (e) said two-speed valve means is arranged between a housing; a first aperture in said housing; and intermediate said first aperture; a pair of spaced apart chambers intersecting the first hole at a location; an outlet port communicating with each chamber and each communicating with and thereby delivering fluid to a separate motor; an inlet port in one of said chambers for receiving working fluid from a source of pressurized fluid; (f) a valve spool 21 provided with a groove portion for connecting the two separated chambers and eliminating communication between the two chambers in a second position; A first side and a second side of the two motors are in communication via a check valve and further in communication with said two speed valve means, said two speed valve means being in said first position. speed valve means and a second side of said other motor and open to said other motor when said dual speed valve means is in said second position; (g) said flow detection valve means is spaced apart from said first hole of said two-speed valve means and said flow detection valve means for circulating fluid on said side and said second side; a first intermediate chamber and a second intermediate chamber disposed within the housing and having a chamber at each end and spaced apart, the chamber at one end communicating with the brake release port; a second hole; a second valve spool provided in the second hole; and a second valve spool provided in the second hole;
resilient means for causing the second hole to be placed in a first position, usually centered on the second hole; and connecting a chamber at one end of the second hole to a second side of the motor, thereby a passageway such that the valve spool is moved to a second position by fluid from the one chamber of the first hole; and a chamber at the other end of the second hole; a passageway coupled to a first side of the motor such that the second valve spool is moved to an opposite second position by fluid from the source of pressurized fluid; and the second valve. a check valve provided on the spool and connecting the first and second spaced apart intermediate chambers at the two second positions; connecting the first intermediate chamber to the other chamber of the first hole; A two-way motor device is provided, characterized in that it comprises: a connection means for connection to a source of pressurized fluid; and a port of said second intermediate chamber adapted to connect to a source of pressurized fluid.

Due to the above-described configuration of the bidirectional motor device of the present invention, even when the hydraulic fluid is cut off during operation in a high-speed descending mode, a portion of the fluid is returned to the motor, thereby continuously lubricating the motor. It produces the effect that can be achieved.

This also prevents excessive pressure from building up within the motor, which in conventional systems could destroy the motor and seriously harm the operator and other equipment, as discussed above.

DESCRIPTION OF THE EMBODIMENTS Referring to the drawings, motors 10 and 11 are illustrated, which are preferably geared motors mounted within a single housing 13 and on a common shaft.

The two-speed valve 14, which attaches the housing 15 to the motor housing 13, has two outlet ports 16.
and 17 are provided. The two outlet ports are spaced apart chambers 18 and 19 along the longitudinal bore 20.
is communicated with each motor 10 and 11. The valve spool 21 is moved from a low speed position where the chambers 18 and 19 are in communication via the groove 21' of the spool 21, as shown in FIGS.
and 19, and is thereby movable into a raised position separating chambers 18 and 19. A fluid input port 22 in housing 15 communicates with chamber 18 and with an inlet line 23 from directional control valve 24 between pump 25 and valve 14. Motor housing 1
A second fluid inlet port on the opposite side of 3 connects both motors 10 and 11 via lines 58 and 59 as well as control valve 24, line 24', counterbalance valve 27 and bypass line 28. A second hole 30 is provided within the housing 15 generally parallel to and spaced apart from the hole 20.
is provided. Hollow valve spool 31 is normally in hole 3
The hole 30 is centered by springs 32 and 33 placed in chambers 34 and 35 provided at both ends of the hole 30. The spool 31 is provided with a radial passageway 36 at the center of the spool, which radial passageway communicates with an interior chamber 37 within the spool through the spool wall. Radial passages 38 and 39 are provided adjacent both ends of spool 31 and are closed by check valves 40 and 41. The check valve has springs 42 and 4
3 into a closed position closing said passages 38 and 39. The bore 30 is provided with two spaced chambers 44 and 45. Chamber 44 is connected to chamber 19 by passage 46 . Chamber 45 is connected to inlet port 47, which is connected to line 48. Line 48 is also line 24'
connected to. Brake release port 50 is normally connected to the engaged brake application motor by line 51 so that when chamber 18 is pressurized, fluid flows through line 56 to chamber 34, port 50 and line 51. , releases the brakes in the system when motors 10 and 11 are energized. At the same time, the spool 31 is moved to the right side in FIG.
8 is connected to chamber 44 and passage 36 is connected to chamber 45. Check valves 52 and 53 are provided in housing 15 and connect bore 20 to chambers 34 and 35 at opposite ends thereof.
Connect to. Check valve 52 connects counterbalance valve 27 to bore 20 by line 54, and check valve 53 connects to the motor shield drain by line 55.

Check valves 53 and 52 are provided to allow excess fluid to escape from the associated chamber. Therefore, the check valve 52 is closed to the valve 2 by the counterbalance valve 27.
prevent excessive pressure from building up at the end of 1;
It also prevents reflux from the brake actuation motor.
Similarly, check valve 53 allows excess fluid to flow from the motor shield drain and prevents excessive pressure from building up.

The brakes also assist in holding each motor stationary when fluid is not supplied to the motor. The brake is a spring-loaded brake that is normally in an engaged state, and is activated automatically when the fluid supply to each motor is cut off by the control valve, and therefore when the supply to the brake motor 51a is also cut off. configured to function as intended. Once the control valves are actuated and fluid is distributed to each motor,
Chamber 18 is pressurized so that fluid flows through line 51 and activates brake motor 51a. The brake motor 51a consists of a fluid pressure cylinder and a piston. The piston also moves to disengage the normally engaged brake from the motor. The brake acts both as a safety device and as a means of reducing the load on the motor when it is not in operation.

In operation, motors 10 and 11 are connected to a common drive shaft, which is connected to a driven winch drum or similar device. Assuming a crane winch or cable drum is being driven, motors 10 and 11 are coupled and fluid exiting directional control valve 24 flows through line 24' to motors 10 and 11, which Equally divided between the drums will rotate and lift the load. This is the normal mode of operation.
When lowering the load, directional control valve 24 moves in the opposite direction, distributing fluid to line 23 and chamber 18, where it is separated by chamber 19 and directed to the motor for slow lowering. It flows. Fluid is in chamber 1
8; the fluid passes through passage 56, chamber 54 and line 51, releases the brake, and also causes the middle chamber spool 31 to move to the right in FIG. If the operator wishes to lower the load at a high speed, move the valve spool 21 to the left against the centering spring 60 to close the communication from chamber 18 to chamber 19 and divert all fluid to the motor. Let it flow to 10. This causes motor 10 to operate at twice the speed. At the same time, fluid flows from line 48 to chamber 45, opening 36, chamber 37, check valve 40, opening 3
8. Circulate through the passage 46 to the chamber 19 and the motor 11 to ensure that the lubrication for the motor 11 remains intact and that excessive pressure is not created.

In order to provide a clear understanding of the operation of the present invention, the fluid flow in each of the four operating states of operating the cable winch will be described.

FIG. 7 schematically illustrates the fluid pressure circuit in a low speed drop condition. Fluid flow from pump 25 enters valve 14 from line 23. The pressure signal is transmitted from line 23 to chamber 34 via line 51. The pressure signal causes spool 31 to move to the right in FIG. 4, thereby causing check valve 40 to direct fluid between chambers 44 and 45 as valve 14 continues to move into the high velocity drop condition. They are placed in a position to encourage them. The pressure signal is then transmitted to the brake actuation motor 51a and the chamber 34, port 50
and opening a winch (not shown) via line 51. The inlet flow from line 23 splits and enters motor 10 via chamber 18 and into motor 11 via chamber 19. The fluid is connected to motors 10 and 1
1 to the counterbalance valve 27,
The counterbalance valve has a positive signal pressure on line 5.
1, 54 and 23, the fluid is returned to the tank.

The check valves 40 and 41 are not essential to the device of the invention, i.e. the device of the invention can operate without the check valves 40 and 41, but the pressure in the passage 37 may It should be understood that this is to prevent backflow in the event of a decrease in

FIG. 8 illustrates a fluid pressure circuit in a high-speed descending state. In this state, the spool 21 is placed on the left side (third
), port 22
Fluid entering the chamber 19 is prevented from flowing into the chamber 19. When this condition occurs, pressure from line 23 pushes flow sensing spool 31 to the right, causing fluid to circulate from counterbalance valve 27 to line 48, check valve 40, and chamber 19. line 58
The flows from both motors coming from and 59 are mixed into a counterbalance valve 27, through which the flow is metered. The inlet pressure in chambers 18 and 19 is reduced by the load acting on the winch to lines 58 and 5.
9, and the winch load attempts to convert the motor into a pump on descent.

The circuit for low speed ascent or lifting is illustrated in FIG. Fluid is supplied to the directional control valve 4 via line 24'.
into the system through both motors 10 and 11, line 28, check valve 28a and line 5.
8 and 59, then flows out through chambers 18, 19 and is then returned to the sump via line 23 and valve 24. Flow sensing spool 31 is moved to the left (as viewed in FIG. 4) by the inlet pressure of line 24' operating through line 48, bleed 35a and chamber 35. Movement of the spool 31 places the check valve 41 in communication with the line 46 and the chamber 45.

FIG. 10 illustrates the circuit in a fast rise and lift state. In this state, spool 21 has been moved to the left (as viewed in FIGS. 3 and 4) such that communication between port 22 and chamber 19 is prevented. Flow sensing spool 31 is moved by the inlet pressure in line 24' so that check valve 41 is placed in communication between line 46 and chamber 45. Fluid enters the motor from line 24' and is transferred to motor 1 by chamber 19, line 46, check valve 41 and chamber 45.
1 and combined with the circulating fluid flow from 1. The combined flow flows through check valve 28a and lines 58,59. Flow through line 58 returns via motor 10, chamber 18, and line 23 to the sump. The flow through the line 59 flows through the motor 11 and has a lubricating effect, which flow then circulates through the chamber 19, the line 46, the check valve 41 and the chamber 45.

The speed of the motor is increased by providing a means for circulating fluid within the motor during high speed descents and ascents.

Although the above description describes preferred embodiments of the invention, it should be understood that other embodiments are possible.

[Brief explanation of drawings]

FIG. 1 is a plan view of a two-way motor assembly according to the present invention. 2 is an end view of the assembly of FIG. 1; FIG. FIG. 3 is a schematic plan view, partially in section, of the twin motor and two speed valve assembly used in FIGS. 1 and 2. FIG. FIG. 4 is a sectional view taken along the line - in FIG. 3. FIG. 5 is a sectional view taken along line - in FIG. 4. FIG. 6 is a sectional view taken along line - in FIG. 4. FIG. 7 is a schematic hydraulic circuit diagram of a two-speed motor according to the present invention operating in a low speed drop condition. FIG. 8 is a schematic fluid pressure circuit diagram, similar to FIG. 7, of the motor in a high speed descent condition. FIG. 9 is a schematic fluid pressure circuit diagram, similar to FIG. 7, of the motor in a low speed up condition. FIG. 10 is a schematic fluid pressure circuit diagram similar to FIG. 7, with the motor in a high-speed lift condition. 10, 11: Motor, 14: Two-speed valve, 16,
17: Outlet port, 18, 19: Chamber, 20: First
hole, 21: valve spool, 22: fluid input port, 27: counterbalance valve, 30: second hole, 31: flow sensing hollow valve spool, 34,3
5: Chamber, 40, 41: Check valve.

Claims (1)

Claims: 1. (a) a pair of bidirectional motors 10, 11 having a common axis; (b) receiving fluid from a source of pressurized fluid and directing the fluid to a first side of the motor; (c) directional valve means 24 for distributing selectively to either side of the second side or the other; (c) said directional valve means 24 and the first of said two motors;
(d) providing a counterbalance valve 27 between said directional valve means 24 and said second side of said two motors; a first two-speed valve means 14 for selectively distributing the fluid to the two motors to equally distribute the fluid to the two motors for low-speed rotary motion;
and a second position offset from the first position for distributing all of the fluid to one motor 10 for high speed rotational motion. between the directional valve means 24 and said two motors 10, 11 and on a second side of said two motors;
a first hole 20 in the housing; and a first hole 20 in the housing.
a pair of spaced apart chambers 18, 19 intersecting the first hole 20 at an intermediate position between the holes; communicating with each chamber and each communicating with a separate motor, thereby supplying fluid to the motor; an inlet port 22 in one of said chambers for receiving working fluid from a source of pressurized fluid; an inlet port 22 in said first hole 20; In the first position said both outlet ports 16,
A valve spool 21 is provided with a groove portion for connecting the two separated chambers 18 and 19 and for eliminating communication between the two chambers in a second position for supplying fluid to the valve spool 17. (f) communicating the first side and the second side of said two motors via a check valve and further communicating with said two-speed valve means 14, said two-speed valve means 14 communicating with said second side; closed to said two-speed valve means 14 and a second side of said other motor 11 when said two-speed valve means 14 is in said second position; flow sensing valve means for circulating fluid between the first side and the second side of the other motor; (g) said flow sensing valve means comprising: said two-speed valve means; A first intermediate chamber 44 and a second intermediate chamber 45 are provided in the housing 15 apart from the first holes 20 of 14 and have chambers 34 and 35 at each end, and are further separated from each other. The chamber 34 at one end has a second hole 30 communicating with the brake release port 50, and a second valve spool 3 provided in the second hole 30.
1 and the second valve spool 31 in the second hole 30, usually in the first center of the second hole 30.
resilient means 32, 33 for bringing the second valve spool 31 into position and connecting the chamber 34 at one end of the second hole 30 to the second side of the motor so that the second valve spool 31 The fluid from the one chamber 18 of the first hole 20 causes one second
a passageway 56 adapted to be moved into position and a chamber 35 at the other end of the second hole 30 connected to the first side of the motor so that the second valve spool 31 is moved into the a passageway 35a adapted to be moved to the other second position by fluid from a pressure fluid source; a check valve 40 connecting the first and second intermediate chambers 44, 45;
41; and a connecting means 46 for connecting the first intermediate chamber 44 to the other chamber 19 of the first hole 20.
and; a port 47 in said second intermediate chamber adapted to be connected to a source of pressurized fluid. 2. The counterbalance valve is normally spring biased to a closed position and in both positions of said two speed valve means distributes fluid from said two speed valve means to said counterbalance valve to overcome said biasing force and 2. A two-way motor system as claimed in claim 1, further comprising means for connecting said two-speed valve means and said counterbalance valve for opening said counterbalance valve. 3. A two-way motor system according to claim 1, wherein the outlet port from one end chamber is connected to an auxiliary fluid actuation mechanism for simultaneous operation with two-speed valve means. 4 brake means acting on the motor shaft and normally engaged; fluid actuation means for releasing said brake; and fluid actuation from said two speed valve means to said fluid actuation means in both positions of said two speed valve means. 2. A two-way motor device according to claim 1, further comprising means for connecting the two for distribution. 5 braking means acting on the motor shaft and normally engaged; fluid actuating means provided on said braking means releasing said brake and said counterbalance valve opening said braking means to release said braking means; 2. A two-way motor apparatus as claimed in claim 1, characterized in that a common coupling means is connected to said counterbalance valve for simultaneously supplying fluid to said balance valve and said fluid actuating means.