JPS63205402A - Rotational fluid pressure device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary fluid pressure device, and in particular, to a rotary fluid pressure device.
The present invention relates to such a device capable of multiple modes of operation, as well as an integrated pyloft control device that can be used to select between such modes.

BACKGROUND OF THE INVENTION Although the present invention can be used with rotary fluid pressure devices having a variety of evacuation mechanisms, it is particularly advantageous for use with devices having gerotor gear sets, and the invention will be described in that context. .

Furthermore, while those skilled in the art will appreciate that the pilot-operated control of the present invention can be used in connection with other types of mode selection, the present invention is particularly useful in connection with two-speed gerotor motors. Explain. As used herein, the term "two-speed" refers to the two ways fluid can flow into a motor at a given speed: high speed (with relatively low torque) and normal low speed (with relatively low torque). This means that the motor output speed can be selected from a wide range.

U.S. Pat. No. 4,480,971, assigned to the assignee of the present invention and incorporated herein by reference, discloses a two-speed gerotor motor of the type described herein. . With a motor like this, in addition to the normal rotary valve adjustment in the motor, some type of switched valve adjustment must be used so that the fluid is in communication with the contraction volume chamber rather than the fluid inlet. One or more expansion volume chambers can be arranged, thus effectively reducing the displacement of the gerotor gear set and increasing the output speed of the motor for a given speed of fluid flow to the motor. be able to.

In many gerotor motor applications where multi-mode (two-speed) operation is preferred, it is also desirable to be able to remotely control the switching valve. As is well known to those now familiar with the art, remote control systems of the type to which the present invention pertains require long hydraulic systems due to initial cost and maintenance considerations. It's much better to do all the systems.

It is therefore an object of the present invention to provide a relatively simple and low cost
It is an object of the present invention to provide a multi-mode hydraulic motor having a pilot type control device, which allows the motor to be easily controlled remotely without requiring a long hydraulic control system.
.

Another object of the present invention is to provide a motor and pilot control system that accomplishes the above objectives without the need for a separate auxiliary pilot pressure source, such as a fill pump.

Another object of the present invention is to provide a motor and a pilot control device in which the pilot control device is integral with the motor and achieves the above objects without substantially increasing the size or cost of the motor. That's true.

(Means/effects for solving the problem) The above and other objects of the present invention are at least 2: a.
This is achieved by providing a rotary fluid pressure device of the type having several modes of operation and further comprising housing means forming fluid inlet means and fluid outlet means. The evacuation means for transferring fluid energy forms an expansion/deflation fluid volume chamber. The main valve means
A button is provided to allow fluid to pass from the fluid inlet means to the inflation fluid volume chamber and from the deflation fluid volume chamber to the fluid outlet means, such fluid communication defining a main fluid flow path.

The switching valve means is movable between a first position in which the device operates in a first mode and a twenty position in which the device operates in a second mode. There are means for biasing the switching valve toward the first position, and the switching valve defines a pilot pressure chamber 7 and, in response to the presence of pilot fluid pressure in the pilot pressure chamber, biases the switching valve toward the first position. Move to the side of the position.

The apparatus features pilot valve means having an inlet in constant fluid communication with the main fluid flow path and an outlet in fluid communication with the pilot pressure chamber. The pilot valve means transmits pilot fluid pressure from the inlet to the outlet;
This makes it possible to control the operation of the switching valve means.

According to a more specific aspect of the invention, the pilot valve means comprises a shuttle valve having a pair of inlets and an outlet, one of which is connected to the fluid inlet means of the device. The main fluid flow path communicates with the fluid at a certain position between the main valve means, and the other inlet communicates with the main fluid flow path at a certain position between the main valve means and the ηε body η outlet means, The outlet of such a shuttle valve comprises an outlet of the pilot valve means in fluid communication with the pilot pressure chamber.

(Example) Here, the drawings will be explained, but the drawings do not limit the present invention. FIG. 1 is a partial axial sectional view of a healthy pressure operated motor of the type to which the present invention is applicable.

This motor is described in U.S. Patent No. 3,572,983.
No. 1, assigned to the present inventor, and incorporated herein by reference.

The fluid motor shown in FIG. 1 is comprised of several parts identified together, such as by a plurality of bolts 11 (shown only in FIG. 2). The motor includes a shaft support casing 13, a wear plate 15, a gerotor evacuation mechanism 17, a port plate 19, and a valve housing portion 21.

Gerotor evacuation mechanisms 17 are well known in the art and will only be briefly described here. In this embodiment, this ejection mechanism 17 is constructed of a Gero
Within each opening, consisting of a lerω′ gear set,
A cylindrical roll member 25, which is well known in the art, is arranged in an N-type configuration. A VCU externally toothed rotor (star) 27 within the ring 23 is arranged eccentrically, typically one more than the number of rolls 25.
Since it has one fewer external tooth, star 27 is ring 2.
Compared to 3, it is so different that it can orbit and rotate.

Due to the relative orbital and rotational motion between the ring 23 and the star 27, a plurality of expansion volume chambers 29E and a plurality of storage chambers 29C are created.
(See Figure 2; in Figure 1 the volume chamber is simply referred to as 29.
) is formed.

Once again, mainly FIG. 1 will be explained. The motor holder includes an output shaft 31 rotatably supported within a shaft support casing 13 by suitable bearing sets 33 and 35. The output shaft 31 has a set of straight internal splines 37 engaged by a set of crowned external splines 39 formed at one end of the main drive shaft 41 .

Another set of crown external splines 43 is arranged at the opposite end of the main drive shaft 41 and engages with a set of straight internal splines 45 formed inside the star 27. In this embodiment, since the star 27 has eight external teeth, the eight orbits of the star 27 provide
It makes one complete rotation, which allows the main drive shaft 41 and output shaft 31 to make one complete rotation.

Also engaged with the internal spline 45 is a pair of external splines 47 formed around one end of the valve lIJAmtmaq, and another set of external splines 47 formed around one end of the valve drive shaft 49 on the opposite side.
A set of external splines 51 are attached to the valve member 55.
(See FIGS. 1 and 3). Valve member 55
is rotatably disposed within the valve housing 21, and the valve drive shaft 49 is keyed to both the star 27 and the valve member 55 to maintain proper valve timing, as is generally known in the art. There is.

The port plate 19 forms a plurality of fluid passages 57, and each of the passages is arranged so that the adjacent volume chamber 29r (see FIGS. 1 and 2) is in continuous fluid communication with the adjacent volume chamber 29r. As is well known to those skilled in the art, as the star 27 orbits and rotates and the valve member 55 rotates, each of the fluid passages 57 alternately closes its respective chamber (29E) when the volume chamber is expanding. ), and when the volumetric chamber is contracting, its volumetric weight (29C)
The discharge (return) fluid is discharged from.

Valve Housing Portion - FIG. 3 Valve housing portion 21 includes a fluid inlet port 61 that communicates with valve member 55 through passageway 63 . The valve housing 21 also includes a fluid outlet port 65 that communicates with an annular chamber 67 surrounding the valve member 55. As is well known to those skilled in the art, if the inlet port 61 and outlet port 65 are reversed, the direction of rotation of the output @31 will be reversed. Valve member 55 defines a plurality of valve passages 69 in constant fluid communication with annular chamber 67 . Valve member 55 also defines a plurality of valve passageways 71 in constant fluid communication with passageway 63. The above ports, chambers,
The passageways (components 61-71) are well known in the art.

A typical fluid motor with only a sluggish, high torque operating mode has eight valve passages 71 and eight valve passages 71 arranged in communication with nine fluid passages 57 and commutating fluid. There will be a valve passage 69. However, a two-speed motor of the type described in the aforementioned U.S. Pat. A control valve passage 73 (shown only by dotted lines in FIG. 3) is formed. Valve member 55 also defines an annular groove 75 through which each of the control valve passages 73 communicates.

Further, the valve housing 21 defines a multi-staged lumen 77 in which a valve seat mechanism (indicated generally at 79) comprising a mating ring member 81 is disposed. The stepped lumen 77 and the counterbalancing ring member 81 cooperate to form an annular chamber 83 which is similar to the ring member 8.
1 by an axial passage 85 formed by an annular groove 7
5 and is in constant fluid communication. Valve housing portion 21 and counter-ring member 81 also cooperate to form an annular chamber 87 which is connected by drain passages 89 and 91 to the case drain of the motor.

Next, FIG. 4 will be explained together with FIG. 5.

Valve housing portion 21 defines a stepped lumen 93 within which a shuttle valve assembly 95 is disposed. The left end of the lumen 93 is sealed with a threaded plug member 97 to form a left pressure chamber 99, and the right end of the lumen 93 is sealed with a threaded plug member 101 to form a right pressure chamber 103. The left pressure chamber 99' is in fluid communication with the fluid inlet port 61 and the passage 63 through a passage 105, and the right pressure chamber 106 is in fluid communication with the fluid outlet port 65 and the annular chamber 67 through a passage 107. The reason for this connection will be explained in detail later.

Further, FIGS. 3 and 4 will be explained. Valve housing portion 21 defines a threaded lumen 109 that communicates with a central reduced diameter portion of stepped lumen 93 . The lower end of the lumen 109 is sealed with a threaded plug member 111. Disposed within the bore 109 is a poppet relief valve 113 which is biased toward the home position shown in FIGS. 3 and 4 by a compression spring member 115. The lumen 109 communicates with the motor case drain by a passageway 117 which communicates from the lumen 109 to the drain passageway 89.

As seen only in FIG. 3, the reduced diameter central portion of the stepped lumen 93 opens unrestrictedly into another stepped and threaded lumen 119, which has an attachment point. A fitting 121 is screwed in. Although only schematically shown in FIG. 3, a pilot pressure system line 123 is connected to the fitting 121 in this installation. The function of the conduit is
The inlet attachment of a solenoid valve (indicated generally at 127) transmits fluid pressure within stepped lumen 93 to fixture 125. This will be explained in detail later. It should be appreciated that instead of providing an external pilot pressure system line 123, an internal passage defined by the valve housing portion 21 interconnects the lumen 93 and the inlet of the solenoid valve 127.

Once again, mainly FIG. 4 will be explained. The valve housing portion 21 defines a lateral stool lumen 129 whose left end is sealed with a threaded plug member 131 and whose right end is 'aided with a threaded plug member 135. This spool lumen 129 has a left annular groove 135,
A plurality of annular grooves including a left annular groove 167 and a center annular groove 139 are provided.

In conjunction with FIG. 4, FIG. 3 will be explained. Multi-fluid inlet port 6 through left annular groove 135 core passage 141
1, and the right annular groove 137 communicates with the core passage 1 without restriction.
43 provides unrestricted communication with fluid outlet port 65.

The central annular groove 139 also communicates with the annular chamber 83 without restriction through the core passage 145.

A valve spool (switching valve) 147 is disposed within the spool lumen 129, which is connected to a compression spring 149.
Therefore, it is shifted to the right at the position shown in FIG. Since the valve spool 147 includes a left land portion 151 and a right land portion 153, when the spool 147 is in the position shown in FIG. 4, the left land portion 151 blocks the flow between the grooves 135 and 139. However, the right land portion 153 has grooves 137 and 13.
Enables distribution between 9 and 9.

At the right end of the spool bore 129, the valve nozzle 1 housing portion 21 forms an annular pilot pressure chamber 155.
It is in unrestricted communication with the outlet side of the solenoid valve 127 by a lumen 157.

This solenoid valve 127 has an upper electromagnetic coil section 161.
(only the external appearance is shown in FIG. 3), and a pair of lead wires 163 are connected to this coil portion. Additionally, 127 solenoid valves and 169 solid axial passages
There is also a lower valve section (indicated generally at 165) having a valve spool 167 having a shape J>3E and a pair of radial passages 171.

A drain passageway 173 communicates with the lumen that receives the valve spool 167, which passageway preferably
It is in unrestricted communication with a relatively low pressure fluid source, such as a motor case drain.

Operation Next, referring to FIG. 6 and FIG. 4 together with FIG.
The operation of a preferred embodiment of the invention will now be described. For the following explanation, high pressure fluid is sent to the inlet port 61 and the outlet port 65 is connected to the system reservoir R through the throttle hole 159.
, which restricts the outflow flow into the reservoir and creates a predetermined desired amount of backpressure at the outflow port 65 and annular groove 67. Alternatively, if the motor of the present invention is used in a closed-loop system of the type with a fill pump or other source of fill pressure, the return line to the system reservoir may be provided with a positive-acting throttle hole. It probably won't be necessary. When high pressure is in communication with inlet port 61, passageway 63, passageway 105, and pressure chamber 99 will also be at high pressure, biasing shuttle valve 95 to the right in the position shown in FIG.

One aspect of the present invention is that the back pressure generated in the annular chamber 67 is utilized as pilot fluid pressure in the pilot type control device of the present invention.

Although it will be apparent to those skilled in the art that the pilot pressure can be selected to be greater than or less than 1 o psi, in this example the pilot pressure will generally be about 100 psi. . Pilot pressure is transmitted from the annular chamber 67 to the right pressure chamber 103 through a passage 107. Shuttle valve 95 is the fourth
In the position shown, the pilot pressure is in the pressure chamber 103.
From there, through lumens 93 and 119, the attachment is communicated to fixture 121 and thence by pilot pressure system line 123 to the inlet of solenoid valve 127.

For the following explanation of operation, solenoid valve 12
7 is in the inoperative position shown in FIG. 3, and the pilot pressure chamber 155 communicates with the system reservoir through a central passage 169, a lower radial passage 171, and a drain passage 173. When solenoid valve 127 is not activated, valve spool 147 is biased to the position shown in FIG.

This will be described later as a first position of switching valve 147 for selecting a first operating mode of the motor. In the first position of the switching valve 147, the left land portion 1
51 blocks fluid communication from annular groove 135 to annular groove 139 so that pressurized fluid is routed from fluid inlet port 61 through passage 63 only. Therefore, as best seen in FIG. 2, high pressure fluid is directed only to valve passage 71, only two of which are in instantaneous fluid communication with expansion volume chamber 29E.

At the same time, the fluid is returned from the contraction 'Mfjt chamber 29C through the valve passage 69 to the annular chamber 67, and further through the core passage 143 to the right annular groove 137. When the diverter valve 147 is in the position shown in FIG. 85 through the annular groove 75 and the rotary valve member 55
flows to The low pressure fluid then flows from the annular groove 75 to the control valve passage 7.
3 to two of the expansion volume chambers 29B.

As a result of this first position of the switching valve 147, the motor operates in a high speed, low torque mode (first mode), as described in more detail in the aforementioned U.S. Pat. No. 4,480,971. do.

If the machine operator desires to select the second mode of operation, an appropriate electrical signal is communicated to solenoid valve 127 to direct pilot pressure from inlet fitting 125 to upper radial passage 171 and central passage 169. and then actuates the valve to a position where it is communicated through lumen 157 to pilot pressure chamber 155 . As is obvious to those familiar with the present technology, the pilot pressure in the pilot pressure chamber 155 overcomes the bias force of the spring 149, causing the right land portion 153 to cut off the flow between the grooves 137 and 139, and the left land Throttle hole 1 is large enough to move switching valve 147 into a position such that section 151 moves into a position allowing communication between grooves 135 and 139.
59 must be selected.

When the switching valve 147 is in the second position, high pressure fluid flows from the previously described inflow port 61 to the passageway 63.
The high pressure fluid is sent to the valve passage 71 through the
It passes through core passage 141 to left groove groove 135, then to central annular groove 139, then through core passage 145, etc. to control valve passage 75. For this reason, as best seen in Figure 2, the high-pressure fluid flows through the four expansion volume chambers 2.
Sent to all 9B. At the same time, the low pressure discharge fluid
From all four contraction volume chambers 29C, it returns to and passes through valve passage 69 and annular chamber 67, and is routed through core passage 143 to right groove 137. However, since right land 153 blocks any flow out of groove 167, all low pressure exhaust fluid is directed out of outlet port 65. As detailed in the aforementioned U.S. Pat. No. 4,480,971, this second position of the switching valve 147 results in:
The motor operates in a low speed/high torque mode (second mode).

Although the pilot type control device of the present invention has been described in connection with the selection between the low speed/high torque operation mode and the cylinder speed/low torque production mode, the control device of the present invention can be used in various other motor modes. It will be obvious to those skilled in the art that it can be used in conjunction with selection. For example, it is possible for the motor to be equipped with a switching valve that has two positions, one that allows operation in a normal operating mode and one that allows operation in a dump mode.

Another Embodiment Referring now to FIG. The figure shows an alternative embodiment in which the pilot control device of the invention is the same, but in place of the switching valve 147, which allows selection of two operating modes, an infinitely variable control valve is used. It is shown.

In the embodiment of FIG. 5, the same components as in the embodiment of FIGS. 3 and 4 are provided with the same reference numerals, and components that have been changed are provided with reference numerals greater than 180. Fifth
The figure shows another embodiment of the switching valve (generally designated 181).

Although FIG. 5 shows the switching valve 18, this alternative embodiment of the gerotor motor is described in US Pat.
It should be understood that a conventional gerotor motor of the type described in No. 572.983 would operate only in the low speed, cylinder torque mode.

In connection with this embodiment, the portion of the invention previously described that provides pilot pressure for the solenoid valve may be the same. However, although this solenoid valve 127 has been described as an on-off type, in this embodiment it could instead provide an infinitely variable pyrobot pressure within the pilot pressure chamber 155 in response to an external electrical signal. . Such solenoid valve operation can be achieved by pulse width modulating the solenoid valve, making the duty cycle of the signal proportional to the desired pressure in chamber 155, as is well known to those skilled in the art. Probably.

Next, FIG. 5 will be explained. Valve housing part 21
form left and right annular grooves 135 and 137, and the previously described through holes, @ 135 communicate with the inlet port 61, and $ 15
7 communicates with the outflow port 65.

In this embodiment, there is no central annular groove because the gerotor motor operates only in a low speed, high torque mode.

The switching valve 181 has a left land portion 183 and a right land portion 18.
5, which may be substantially the same as the land portions 151 and 153 shown in the embodiment of FIG.

In the embodiment of FIG. 5, each left land 183 is provided with one or more flow adjustment notches 187, and the right land 185Fi is similarly provided with one or more flow adjustment notches 189. Therefore, high pressure is applied to the inlet port 6
1, a remote electrical signal sent to the solenoid valve provides a variable pilot pressure within chamber 155,
Change the position of the switching valve 181. As a result, the diverter valve 181 operates in a flow-neutral manner, with the annular groove 137 regulating the high pressure fluid within the groove 135 from the flow regulating notch 187 to the outlet port 65. - By way of example only, the embodiment shown in FIG. 5 can be used as part of an apparatus for providing closed-loop speed control of remote motors. It will be appreciated by those skilled in the art that the structure shown in FIG. 5 is included primarily to illustrate an alternative use of the pilot-operated controller of the present invention.

(Effects of the Invention) The present invention provides a rotary fluid pressure device with a pilot valve means having a main fluid flow path, an inlet through which fluid always flows, and an outlet through which fluid communicates with a pilot pressure chamber. Fluid pressure is transmitted from the inlet to the outlet, thereby controlling the operation of the switching valve means, making it possible to easily remotely control the motor without increasing the length of the hydraulic control system, as well as simplifying the configuration. It is possible to realize a small and low cost device.

[Brief explanation of the drawing]

FIG. 1 is a partial axial cross-sectional view of a hydraulic motor of the type in which the invention may be utilized; FIG.
3 is an axial sectional view similar to but larger in size than that of FIG. 1, showing the valve housing portion of the hydraulic motor of FIG. 1; FIG. 4 is a partial cross-sectional view of #4-4 of FIG. 6 with the same dimensions as FIG. 3; FIG. 5 is a partial cross-sectional view similar to FIG. 4 showing another embodiment of the invention; It is a front view. 17・Ejection mechanism 19・Port plate 21・
... Valve housing 29 Hiiragi Danya 55
・Valve member 61 ・Fluid inflow port 65 Fluid outflow port 95 Shuttle valve 107...
・Passage 119...Inner cavity 149...Spring 1
55...Pilot pressure chamber (#2 idiots)

Claims (10)

[Claims] (1) A type that has at least two operating modes,
Further, a fluid inflow means (61) and a fluid outflow means (65)
housing means (21) forming an inflation/deflation fluid volume chamber (29); evacuation means (17) for transferring fluid energy forming an inflation/deflation fluid volume chamber (29); a main valve adapted to allow fluid to flow from the fluid volume chamber to the fluid outlet means, the fluid flow from the fluid inlet means through the fluid volume chamber to the fluid outlet means forming a main fluid flow path; Means (19, 5
5), a switching valve means (147) movable between a first position for operating in a first mode and a second position for operating in a second mode; biased toward said first position, said switching valve forming a pilot pressure chamber (155) opposing a biasing force thereof and shifting to said second position in response to pilot fluid pressure in said pilot pressure chamber. (a) the pilot valve means (95) has an inlet (107) in constant fluid communication with the main fluid flow path and in fluid communication with the pilot pressure chamber; (b) the pilot valve means is adapted to convey the fluid pressure from the inlet to the outlet, thereby controlling operation of the switching valve means; A rotary fluid pressure device characterized by: (2) the housing means defines a valve lumen (129), the switching valve means comprises a valve spool (147) disposed within the valve lumen, and the housing means and the valve spool cooperate; The rotary fluid pressure device according to claim 1, characterized in that the pilot pressure chamber is formed by a rotary fluid pressure device. (3) Means (121, 123, 127, 157) are adapted to ensure that the outlet (119) of the pilot valve means (95)
) and the pilot pressure chamber, the device further includes a flow control valve (127) disposed within the pilot fluid flow path.
A rotary fluid pressure device according to claim 1, characterized in that it is comprised of: (4) the flow control valve (127) is responsive to an external control signal (163) to a first position (FIG. 3) that prevents transmission of the pilot fluid pressure to the pilot pressure chamber; a valve member movable between a second position and a second position allowing transmission of said pilot fluid pressure to a pilot pressure chamber;
67) The rotary fluid pressure device according to claim 3, characterized in that it comprises: (5) the flow control valve comprises an electromagnetically actuated valve member (167), the external control signal comprises a remote electrical signal (163), and the valve member is in the first position (Fig. 5. A rotary fluid pressure device according to claim 4, characterized in that the pilot pressure chamber allows communication of the pilot pressure chamber with a fluid supply at a relatively low fluid pressure. (6) The inlet (107) of the pilot valve means (95) is in fluid communication with the main fluid flow path at a position (67) downstream of the fluid discharge means (17). A rotary fluid pressure device according to claim 1. (7) Said housing means (21) forms a pair of fluid ports (61, 65), one of which can be constituted by said fluid inlet means and the other can be constituted by said fluid outlet means, whereby said A rotary fluid pressure device according to claim 1, characterized in that the main fluid flow path is reversible, allowing the device to move forward or backward. (8) The pilot valve means (95) comprises a shuttle valve means (95) having a pair of inlets (105, 107) and one outlet (119), one of the inlets being connected to the the main fluid flow path is in fluid communication at a location between the fluid inlet means and the main valve means; the other inlet is at a location between the main valve means and the fluid outlet means; and wherein the outlet of the shuttle valve means is in fluid communication with the pilot pressure chamber. A rotary fluid pressure device according to claim 1. (9) A patent claim characterized in that the first mode (FIG. 4) consists of a high-speed/low-torque mode of operation, and the second mode consists of a low-speed/high-torque mode of operation. A rotary fluid pressure device according to item 1. (10) said housing means (21) forming control fluid passage means (145), said rotary valve means (55) being configured to rotate said control fluid passage means (145) in response to said rotational movement of said rotary valve member; ) and the fixed fluid passage means (57
), the first position (FIG. 4) of the switching valve means forming a control valve passage means (73) arranged in fluid communication with the control fluid passage means (145).
) is in communication with the fluid outlet means, and the second position of the switching valve means communicates the control fluid passage means with the fluid inlet means.
The rotary fluid pressure device described in Section.