JP2589342B2 - Controller for fluid actuator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid actuator, and more particularly, to a controller in an all-hydraulic power steering apparatus.

2. Description of the Related Art A housing having a tank port, a pump port, and a pair of control fluid ports coupled to a fluid actuator, an internal tooth member formed in a portion of the housing, and a A metering unit comprising an external tooth member that meshes with the valve and rotates and revolves, a valve that controls the flow of an object between the ports and the metering unit, and a valve that is inserted from one axial side of the housing, Controllers for object actuating devices having an input shaft for actuating are known.

By the way, in such a controller, the flow control valve for the object is often of a so-called rotary valve type comprising a control sleeve and a control spool. In order to prevent the fluid from leaking, precision machining is required so as not to form a gap between the two, and furthermore, in-situ polishing is required, so that there is a problem that the working efficiency is poor and the cost is high.

Problems to be Solved by the Invention In order to solve the problems of such a rotary valve type control valve, a controller provided with a so-called disk valve type control valve has been proposed. And those disclosed in JP-A-122070.

However, in such a controller, since all the ports are formed in the housing in the radial direction and open to the outer peripheral surface, the axial length of the disc valve becomes longer, and the entire length and width of the controller are increased. There is a problem that the dimensions in both directions are large and the volume is large, and the processing method is complicated and expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive controller which can reduce the entire volume and can be easily processed.

Means for Solving the Problems In order to achieve the above object, the present invention provides a housing having a tank port, a pump port, and a pair of control fluid ports connected to a fluid actuator, and one of the housings. The internal tooth member formed in the portion, the measuring portion composed of the external tooth member that is in the internal tooth member and meshes with the internal tooth member to rotate and revolve, and the flow of the fluid between the ports and the measuring portion. A controller for a fluid actuating device having a valve to control and an input shaft disposed axially within the housing to actuate the valve, wherein the housing has a front cap and an end cap; Each port is provided in the end cap in the axial direction, the control valve is constituted by first and second disc-shaped valves, and the measuring section and the second
The valve and the first valve are sequentially arranged in the axial direction from the front cap to the end cap of the housing, and the external tooth member and the second valve are interlocked by a drive shaft arranged in a center hole of the housing, and the input valve is connected to the input shaft. The axis is the front cap,
The drive shaft extends through the center hole of the drive shaft in the axial direction and is connected to the first valve.

Embodiment An embodiment shown in the drawings will be described. 1 is an end cap, 2 is an end plate portion, 5 is a valve casing,
Reference numeral 4 denotes a valve plate portion, 3 denotes a measuring portion, 8 denotes a front plate, and 9 denotes a front cap. These are sequentially arranged from right to left in FIG. 1 and are integrally formed by bolts 14 passing therethrough. Are linked together. A first valve 7 is provided on the right side in the valve casing 5,
The second valve 6 is provided on the left side.

As shown in FIG. 2, the end cap 1 is provided with a tank port 22 for outflow to the tank, a pump port 21 for inflow from the pump, and cylinder ports 23R and 23L respectively communicating with the right and left chambers of the power cylinder. The end plate 2, the first valve 7 and the second valve 6 in the valve casing 5, the valve plate 4, and the metering unit 3 are connected to the ports 21, 22, 23 R, and 23 L. Are provided respectively.

The end plate portion 2 includes an end plate 101, an intermediate plate 102, and a valve plate 103. The end plate 101 (FIG. 3) is provided with through holes 105, 106, 107R, 107L that communicate with the ports 21, 22, 23R, 23L of the end cap 1. The intermediate plate 102 (FIG. 4) has a through hole 1
A through-hole 109 communicating with the through-hole 06, an outer portion communicating with the through-hole 105, and a radius R1 portion, the side of the through-hole 109 extending to the diametrically opposite side without communicating with the through-hole 109, is bent. Hole 10
8, and an outer portion communicating with the through holes 107R and 107L, and through holes 110R and 110L extending in a fan shape toward the through hole 109 and having inner portions with radii R2 and R3, respectively. The valve plate 103 (FIG. 5) has fan-shaped through-holes 111, 111 'having a radius R1 and a portion communicating with a part of the through-holes 110R, 110L at symmetric positions in the vertical diameter communicating with a part of the through-hole 108. Through holes 112R, 112L of symmetrical positions and radii R2, R3 respectively,
And a through-hole 113 communicating with the through-hole 109 is provided.

The first valve (FIG. 6) is disposed adjacent to the valve plate 103 of the end plate portion 2, and has a substantially elliptical center hole 117 having oil passages 115, 115 'communicating vertically on the left side in FIG. And an output unit 121 having a central hole 120 at the upper and lower parts of which an oil passage 119, 119 'communicates.

On the left side (A) of the input unit 118, on the same radius,
A pair of sector-shaped recesses 122R and 122L are located at the upper left and right symmetric positions with the horizontal diameter as the base, and the sector recesses 123 and 123 'are located at the lower left and right symmetric positions below the horizontal diameter.
16, 116 'are provided respectively, and the recesses 116, 116' communicate with the center hole 117 through oil passages 115, 115 ', and the recesses 116, 116'
The upper part is open outward.

The right side (C) of the output portion 121 is provided with concentric ring grooves 124, 124 ', 124''having radii R1, R2, R3, and a through hole communicating the ring groove 124 with the sector-shaped concave portions 122R, 122L. 125R, 1
25L is a through hole 1 communicating the ring groove 124 'and the sector-shaped recess 123.
26, and a through hole 127 communicating the ring groove 124 '' with the sector-shaped recess 123 '' is provided.

As shown in FIG. 7, the second valve 6 has an outflow portion 129 having a large diameter splined center hole 128 on the left side thereof.
And an inflow portion 131 having a center hole 130 composed of a small-diameter deformed hole.
It consists of

On the left side surface (A) of the outflow portion 129, a plurality of (six in this embodiment) concave portions 132,
132 ′ are provided alternately, and concentric ring grooves 133 and 133 ′ are provided on the right side surface.
Through holes 134 and 13 that communicate the 2 ′ and the ring groove 133 ′ respectively
4 'is provided.

On the right side surface (C) of the inflow portion, a pair of recesses 136, 136 'are provided at symmetric positions above the horizontal diameter on the same radius.
And a pair of recesses 137, 137 'at the lower left-right symmetric position close to the horizontal diameter, and further a ring groove 133, 133' and a recess 13
There are provided through holes 139, 139 'communicating with 7,137',
In addition, an opening recess 140 cut inward is provided in the vertical upper part.

FIG. 8 shows a retaining ring 146 connecting the two valves 6, 7, which is connected to the inlet 131 of the valve 6.
(FIG. 7B) step portion 143 and the step portion of the output portion 121 of the valve 7
144 (FIG. 6B), which is held by the holding ring 146, surrounds the outside of the inflow portion 131 and the input portion 118, and further has a bent portion 148 fitted to the openings 140, 135 thereof. It comprises a spring 13.

The valve plate portion 4 is composed of a valve plate 35 (FIG. 10) adjacent to the outlet portion 129 of the second valve 6 and a measuring portion plate 34 (FIG. 11) adjacent thereto. , 34 are provided with through holes 148, 149 communicating with the pressure chamber 33 described later, and central holes 151, 152, respectively.

A measuring section 3 is provided adjacent to the measuring section plate 34, the details of which are shown in FIG.
30 and an external tooth member 31 eccentrically provided therein and having one less tooth than the internal tooth member 30.
A spline is formed in 32, and a spacer 17 is disposed at the tip of this center hole, and communicates with each port 21, 22, 23R, 23L between both members 30, 31, and an external tooth member Although five pressure chambers 33 are formed which repeat expansion and contraction with the rotation of 31, the number of pressure chambers 33 can be increased as required.

In FIG. 1, reference numeral 29 denotes a drive shaft. The drive shaft 29 has a hollow cylindrical shape and is disposed in the central hole 128 of the external tooth member 31, the valve plate portion 4, and the outlet portion 129 of the second valve 6. At both ends thereof, spline external teeth are provided, and these spline external teeth are respectively provided in the center holes 32 of the external tooth member 31.
And the spline internal teeth of the center hole 128 of the outflow portion 129 of the second valve 6.

The input shaft 10 includes the front cap 9, the front plate 8, the spacer 17, the drive shaft 29, and the inflow portion 131 of the second valve 6.
And extends through the center hole 130 of the first valve 7.
Is fixedly fitted to the center hole 117.

 The operation of this embodiment will be described.

(1) Basic operation When the input shaft 10 is turned by operating the steering handle, the first valve 7 is turned together with the input shaft 10, and the centering spring 13 is bent, so that the first valve 7 is moved between the valve 7 and the second valve 6. And the second valve 6 also rotates.

By switching the valve interface between the first and second valves 7 and 6, oil from the pump port 21 is supplied to the measuring section 3 as described later.
Of the power cylinder from one of the cylinder ports 23R or 23L and flows into one of the chambers of the power cylinder, and the oil in the other chamber passes through the tank port 22 from the cylinder port 23L or 23R. Spills out of equipment.

Due to such a flow of oil, the external teeth member 31 of the measuring section 3 rotates as a hydraulic motor, and the rotation rotates the second valve 6 via the drive shaft 29 to cancel the angular displacement. . By such a series of operations, oil is discharged from the cylinder port 23R or 23L in proportion to the rotation of the input shaft 10, and the power cylinder is operated.

(2) Operation when the valve is neutral At this time, the oil flowing from the bomb port 21 flows through the through-hole 105 of the end plate 101, the through-hole 108 of the intermediate plate 102, and the through-holes 111 and 111 'of the valve plate 103 to the right side of the first valve 7. Flows into the ring groove 124.

And this oil is from here through hole 125R, 125L of the valve 7
Through the recesses 122R and 122L on the left side, and as shown in FIG. 9 (A), the recesses 122R and 122L
Since it is in communication with 6 ′, 136, the oil flows through the recesses 136 ′, 136 to the oil passages 116, 115 of the first valve 7 and to the oil passage 119.

Next, this oil is applied to each plate 103 of the end plate part 2,
It flows through the through holes 113, 109, 106 of 102, 101 to the tank port 22 and flows out therefrom, during which the cylinder ports 23R, 23L
Are blocked, and no oil flows through the power cylinder.

(3) Operation when the valve is displaced to the right In this case, the oil that has flowed in from the pump port 21 flows in the same way as when the oil is in a neutral state, and is recessed on the left side surface of the first valve 7.
It flows to 122R and 122L. FIG. 9 (B) shows the positional relationship between the two valves 6 and 7 at this time. In this case, the oil flowing into the concave portion 122L of the first valve 7 has the concave portion 137 of the second valve 6 and the through-hole 13
9, flows through the concave groove 132 through the ring groove 133 and the through hole 134, and from there through holes 148, 149 of both plates 35, 34 of the valve plate portion 4.
Through the pressure chamber 33 of the measuring section 3. The oil measured by the measuring section 3 is supplied to the through holes 149,
148, and flows into the recess 132 'of the second valve 6, and the through hole 13
4 ′, ring groove 133 ′, through hole 139 ′, right side recess 13
Flows to 7 '.

The recess 137 'communicates with the recess 123 on the left side of the first valve 7 as shown in FIG.
Further, the through hole 126, the ring groove 124 ', the through hole 112R, the oil passage 110R, and the through hole 107R of each of the plates 103, 102, 101 of the end plate 2 are provided.
And flows into one chamber of the power cylinder via one cylinder port 23R.

The oil discharged from the other chamber of the power cylinder flows in from the other cylinder port 23L, and the through holes 107L of the plates 101, 102, 103 of the end plate portion 2 and the oil passage 110
L flows into the through hole 112L. From the through hole 112L, through the ring groove 124 'of the first valve 7b and the through hole 127, the concave portion 12 on the left side surface is formed.
3 ', through the recess 138 of the second valve 6 communicating therewith, again to the oil passage 116' of the first valve 7b, and further to the oil passages 115 'and 119', and each plate of the end plate 2 From 103, 102, 101 through holes 113, 109, 106 to tank port 22
Is leaked through.

That is, the oil flowing from the pump port 21 is
, And flows into one chamber of the power cylinder from the cylinder port 23R, and the oil in the other chamber flows into the device via the cylinder port 23L and flows out from the tank port 22.

(4) Operation at the time of displacement of the valve to the left FIG. 9 (C) shows the relative positional relationship between the two valves 6 and 7 at this time. Since the member moves and the oil flows only, the detailed description is omitted.

The present invention is as described above, and in the controller for a fluid operating device, the housing includes a front cap,
An end cap, each port is provided in the end cap in the axial direction, the control valve is configured by a disk-shaped first and second valves, and the metering unit, the second valve, and the first valve are: The external teeth member and the second valve are sequentially arranged in the axial direction from the front cap to the end cap of the housing, and the external tooth member and the second valve are interlocked by a drive shaft arranged in a center hole thereof, and the input shaft is a front cap, a drive shaft. Each port extends in the axial direction through the center hole and communicates with the first valve, so that each port is formed in the housing in the radial direction and has a higher height in the vertical direction than that which is opened in the outer periphery. And the axial dimension of the control valve can be reduced, so that the overall axial length can be reduced, and as a result, the overall volume can be reduced. Is easily processed without the need for precision machining as in the valve, there is an effect that can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention, and FIG.
FIG. 3 is a side view taken along line III-III in FIG. 1, FIG. 4 is a side view taken along line IV-IV in FIG. 1, and FIG. FIG. 6 is a drawing of the first valve of FIG. 1, wherein FIG. 6A is a left side view, FIG. 6B is a vertical sectional front view, and FIG. 6C is a right side view. View, 7th
The figure is a drawing of the second valve of FIG. 1, (A) is a left side view, (B) is a left half of the line (B) along line BB, and a right half is (C). FIG. 8C is a cross-sectional view taken along the line BB, FIG. 8C is a right side view, and FIG.
FIG. 9 is a side view taken along the line VIII, and FIG. 9 is (A) neutral, (B) right displacement, and (C) of the switching surface of each valve in FIGS.
FIG. 10 is an explanatory view showing the state at the time of leftward displacement, and FIG.
FIG. 11 is a side view taken along line XI-XI in FIG. 1, and FIG. 12 is a side view taken along line XII-XII in FIG. DESCRIPTION OF SYMBOLS 1 ... End cap 2 ... End plate part 3 ... Measurement part 4 ... Valve plate part 5 ... Valve casing 6 ... Second valve 7 ... First valve 8 ... Front plate 9 ... Front cap 10 … Input shaft 13… Centering spring 14… Bolt 21… Pump port 22… Tank port 23R, 23L… Cylinder port 29… Drive shaft 30… Internal tooth member 31… External tooth member

Claims (1)

(57) [Claims] 1. A housing having a tant port, a pump port, and a pair of control fluid ports connected to a fluid actuator, an internal tooth member formed in a portion of the housing, and a housing within the internal tooth member. There is a measuring portion comprising an external tooth member that engages with this and rotates and revolves, a valve that controls the flow of fluid between the ports and the measuring portion, and is disposed in the housing in the axial direction, In a controller for a fluid actuator having an input shaft for operating the valve, the housing has a front cap and an end cap, and each of the ports is provided in the end cap in an axial direction, and the control valve is The measuring unit, the second valve, and the first valve are sequentially arranged in the axial direction from the front cap to the end cap of the housing. The external tooth member and the second valve are interlocked by a drive shaft disposed in their central holes, and the input shaft extends axially through the front cap and the central hole of the drive shaft to be connected to the first valve. A controller for a fluid actuating device, comprising: