JP4830897B2 - Hydraulic adjustment valve - Google Patents

Description

  The present invention relates to a hydraulic pressure adjusting valve suitable for an application in which the hydraulic pressure supplied from a hydraulic pressure source is adjusted and supplied to an automatic transmission for an automobile or the like.

  2. Description of the Related Art A hydraulic pressure control valve mounted on an automatic transmission accommodates a spool-like valve element in a valve body having a cylindrical valve hole so as to be freely stroked (slidable). The valve body is urged by the spring load of the arranged spring and is urged by the attractive force of the electromagnetic solenoid to stroke. The hydraulic pressure is adjusted by increasing or decreasing the stroke amount of the valve body in proportion to the suction force that increases or decreases according to the increase or decrease of the energization amount to the electromagnetic solenoid, and the land provided on the valve body is an input port or output port provided on the valve body. And by adjusting the opening of the oil discharge port (see Patent Document 1).

  In this hydraulic control valve, the stroke range of the valve body is such that the energization amount increases from the valve closing position where the energization to the electromagnetic solenoid is stopped (non-energized) and the stroke of the valve body is zero, and the suction force is loaded with a spring load. The valve opening starts to increase and the valve opening is increased or decreased (proportional) according to the non-pressure-regulating range from the zero opening to the opening of the valve. It is a constant pressure region that maintains the maximum output hydraulic pressure in the pressure adjustment region and the pressure adjustment region.

  A first spring 3 for biasing the valve body 2 in the valve closing direction with a spring load F1 and an electromagnetic solenoid for attracting the valve body 2 in the valve opening direction with a suction force Fs corresponding to the energization amount shown in FIG. 4, the spring constant k1 of the first spring 3 is increased, and the initial spring load F1 at a position where the stroke of the valve body 2 is zero, as shown by the characteristic curve A in FIG. By setting (0) to be small, the attractive force Fs can exceed the spring load F1 even in a state where the energization amount to the electromagnetic solenoid 4 is small. For this reason, the valve body 2 can start a stroke rapidly, and it is possible to improve the initial response of hydraulic pressure adjustment.

  However, if the spring constant k1 is large, the change (increase / decrease rate) of the spring load F1 with respect to the change in energization amount (increase / decrease rate of the attractive force Fs) increases. The increase / decrease rate of the stroke amount becomes small. As a result, the response of the output hydraulic pressure that is substantially equivalent to the stroke of the valve body 2 with respect to the change in the energization amount, that is, the pressure regulation response in the pressure regulation region is lowered.

In order to improve the response in the pressure adjustment region, the pressure adjustment response is improved if the spring constant k1 of the first spring 3 is set small as shown by the characteristic curve B in FIG. However, since the spring load F1 of a certain value or more is required in the pressure adjustment region, the initial spring load F1 (0) at the position where the stroke of the valve body 2 is zero becomes large. The time required for the suction force Fs to become larger than the large initial spring load F1 (0) becomes longer, and the initial response of pressure regulation is lowered. The spring constant k1 and responsiveness of the first spring 3 are the characteristics shown in the table of FIG.
JP 2002-222710 A

  In order to improve the initial responsiveness, as shown in FIGS. 5A and 5B, a second spring constant k2 that applies the spring load F2 to the valve body 2 opposite to the spring load F1 of the first spring 3 is used. As shown in FIG. 5C, a hydraulic control valve 1B is used in which the spring 5 is disposed and the combined initial load F0 is reduced to F0 = F1 (0) −F2 (0). F2 (0) is an initial spring load of the second spring 5 at a position where the stroke is zero. In this hydraulic control valve 1B, the initial response of pressure regulation is improved, but a spring load F2 in the direction opposite to the non-pressure regulation region acts on the valve body 2 in the pressure regulation region. For this reason, the composite spring constant k1-k2 in the pressure adjustment region has a large slope, and there arises a problem that the response of the pressure adjustment region cannot be sufficiently improved.

  In the specification of a hydraulic control valve of a general automatic transmission for automobiles, the attractive force Fs (0.2 A)> F1 (0) when the energization amount to the electromagnetic solenoid 4 is 0.2 A (ampere). Therefore, the attractive force Fs of the electromagnetic solenoid varies within a range of 0.5 N (Newton) when 0.2 A is energized.

An object of the present invention is to provide a hydraulic pressure regulating valve that can simultaneously achieve an improvement in initial response and an improvement in response in a pressure adjustment region with a simple configuration.
An object of the invention described in claim 2 or claim 3 is to provide a hydraulic pressure regulating valve that can appropriately improve the optimum initial response and the response in the pressure adjustment region with a simple configuration.
The object of the invention described in claim 4 is to provide a hydraulic pressure regulating valve in which the pressure regulating start position is set to a position where the valve element opens .

The hydraulic control valve according to claim 1 has a valve body that adjusts the opening degree of the input port, the output port, and the oil discharge port. In the present invention, the first spring that urges the valve body in the direction in which the valve opening is reduced by the spring load F1, the electromagnetic solenoid that urges the valve body in the direction in which the valve opening increases by the suction force Fs proportional to the energization amount, and the valve body Is stroked to the non-pressure-regulating region, the pressure-regulating region, and the constant-pressure region by the second spring that urges the spring in the direction of increasing the valve opening degree with the spring load F2. The second spring biases the valve body in the valve opening increasing direction only in the non-pressure-regulating region.
As a result, the spring constant of the first spring is set small to improve the response in the pressure adjustment region, and at the same time, the initial response can be maintained well by the effect of the spring load of the second spring that acts only in the non-pressure adjustment region. .

In the invention of claim 2, the second spring has a free length in the vicinity of the boundary between the non-pressure adjusting region and the pressure adjusting region, and does not act on the valve body in the pressure adjusting region. As a result, it is possible to obtain optimum initial response improvement and pressure regulation response in the pressure regulation region with a simple configuration.
In the invention of claim 3, the second spring is locked by the stopper in the vicinity of the boundary between the non-pressure adjusting region and the pressure adjusting region, and does not act on the valve body in the pressure adjusting region. Thereby, the same effect as that attained by the 2nd aspect can be attained.
In the invention of claim 4 , the pressure adjustment start position is a position where the valve element opens .

  In the best mode of the present invention, a valve body is unidirectionally (valve-controlled) by a first spring that urges the valve body in the other direction (valve opening reduction direction) with a spring load F1 and a suction force Fs proportional to the energization amount. And a second spring for urging the valve body in one direction (valve opening increasing direction) with a spring load F2, wherein the second spring The valve body is urged in the valve opening increasing direction only in the non-pressure-regulating range.

  The present invention will be described together with Example 1 shown in the drawings. In the hydraulic control valve 1, a spool-shaped valve body 2 is slidably disposed in an axial direction in a cylinder 11 provided in a cylindrical valve body 10. The valve body 10 is formed with an input port 12, an output port 13, an oil discharge port 14, and a feedback port 15 that communicates with the output port 13 on the outside. The valve body 2 is provided with a first spring 3 at one end (the left end in the figure), and a plurality of lands 21 that increase or decrease the opening degree of the input port 12 and the oil discharge port 14 according to the stroke of the valve body 2 are predetermined. In the position.

  An electromagnetic solenoid 4 is attached to the other end of the valve body 10. The electromagnetic solenoid 4 has a structure in which an electromagnetic coil 42 is fixed in a cylindrical housing 41, one end is closed with a fixed core 43, and the other end is covered with a cover 44. A plunger 45 is housed in a central part on the other end side in the electromagnetic coil 42 so as to be displaceable, and a rod 46 is housed in one end side so as to be slidable in the axial direction. The plunger 45 is provided with the second spring 5. One end of the rod 46 is in contact with the other end of the valve body 2, and the other end is in contact with one end of the plunger 45.

  The valve body 2 is urged in the other direction (valve opening reduction direction) by the spring load F1 of the first spring 3 having a small spring constant k1, and is unidirectionally (valve-controlled) by the attractive force Fs of the electromagnetic solenoid 4 proportional to the energization amount. Is biased in one direction (valve opening increasing direction) by the spring load F2 of the second spring 5 having the spring constant k2. In this embodiment, spring load F1> spring load F2 is set, and (a) in FIG. 1 shows the position of the valve element 2 when the electromagnetic solenoid 4 is not energized when not energized.

  When the electromagnetic solenoid 4 is energized, the spring load F1 <attraction force Fs + spring load F2 is set when the energization amount exceeds 0.2 A, and (B) in FIG. Indicates the position of the valve body 2 when the electromagnetic solenoid 4 is energized at 0.2A. In this position, the valve body 2 is not subjected to the action of the spring load F2 of the second spring 5, and the spring load F1 and the feedback load are stroked by the action of Ffb and the attractive force Fs of the electromagnetic solenoid 4.

  The graph of FIG. 2 shows the displacement (stroke) of the valve body 2 due to the spring load F1, the attractive force Fs, and the spring load F2. The valve body 2 is in a non-pressure-regulating region from the position where the stroke during non-energization is 0 (valve closing position) to the time when pressure regulation is started, and the pressure regulation in which the output hydraulic pressure is proportional to the amount of energization to the electromagnetic solenoid 4 Displacement to a region (valve opening 0 to fully open) and a constant pressure region (fully opened) in which the maximum output oil pressure in the pressure adjusting region is maintained.

  In this embodiment, one end 51 of the second spring 5 is in contact with the other end of the plunger 45, and the other end 52 is fixed inside the cover 44 of the electromagnetic solenoid 4. The spring load F2 is compressed at the position where the stroke is 0 and has a maximum value. The spring load F2 is set to have a free length at the boundary between the non-pressure-adjusting region and the pressure-adjusting region, and F2 = 0. The other end 52 of the second spring 5 may be engaged, welded, or other fixing method by an engaging means, but may be a free end that is not fixed.

  With this configuration, at the beginning of energization of the electromagnetic solenoid 4, since the spring load F2 is large and the spring load F1 is small, the combined spring load F1-F2 is small. For this reason, the valve body 2 can quickly start moving with respect to the rising of the attractive force Fs of the electromagnetic solenoid 4, and the initial response of the hydraulic pressure adjustment is excellent. Further, in the pressure adjusting region, F2 = 0, the spring load acting on the valve body 2 is only F1, and the spring constant k1 of the first spring 3 is small. The followability (responsiveness) of the valve body 2 is also great.

  FIG. 3 shows a hydraulic pressure regulating valve 1C according to the second embodiment. In this embodiment, a plate spring (disc spring) is used as the second spring 5. The second spring 5 has an outer peripheral end (one end) 53 fixed to the housing 41 together with the outer periphery of the cover 44, and an inner peripheral end (other end) 54 is loosely fitted to a small diameter portion 47 provided at the other end of the plunger 45. It abuts as a free end. In this embodiment, an annular protrusion 60 is provided concentrically on the other end surface 48 of the housing 41 to serve as a stopper 6 for the second spring 5. In the second spring 5, the intermediate position of the leaf spring (disc spring) abuts against the stopper 6 at the boundary between the non-pressure-adjusting region and the pressure-adjusting region, and the inner peripheral end 54 is displaced (deformed) to the other end side. Be blocked.

  For this reason, in the hydraulic pressure regulating valve 1C, the inner peripheral end 54 is in contact with one end of the valve body 2 in the non-pressure regulating region and is biased in the valve opening increasing direction. The second spring 5 abuts against the stopper 6 at the boundary, and the inner peripheral end 54 is separated from the other end of the plunger 45 in the pressure adjustment region and the constant pressure region, and a gap 61 is generated. Also in this embodiment, the spring load characteristic is the same as that of the embodiment 1 shown in FIG. 2 (a), and the improvement of the initial response and the improvement of the pressure adjustment response in the pressure adjustment region can be achieved simultaneously. The structure in which the stopper 6 is integrally formed with the other end surface 48 of the housing 41 is advantageous from the viewpoint of manufacturing cost, but other methods may be used.

  FIGS. 2B and 2C show the relationship between the energization amount to the electromagnetic solenoid 4 and the combined initial spring load of the first spring 3 and the second spring 5. In this embodiment, when the energization amount to the electromagnetic solenoid 4 is 0.2 A, the attractive force Fs (0.2 A)> spring load F1 (0) −F2 (0) is set. Thereby, the initial responsiveness of the valve body can be improved reliably and smoothly regardless of variations in the attractive force Fs of the electromagnetic solenoid 4.

(Example 1) which is sectional drawing of a hydraulic control valve. It is a graph which shows the relationship between the stroke of a valve body, and the attractive force of an electromagnetic solenoid. (Example 2) which is sectional drawing of a hydraulic control valve. It is sectional drawing of a conventional hydraulic pressure regulation valve, a characteristic graph, and a table | surface characteristic. It is sectional drawing and the characteristic graph of the other conventional hydraulic control valve.

Explanation of symbols

1 Hydraulic adjustment valve (Example 1)
1C Hydraulic adjustment valve (Example 2)
2 Valve body 3 First spring 4 Electromagnetic solenoid 5 Second spring 6 Stopper 11 Cylinder 12 Input port 13 Output port 14 Oil draining port Fs Electromagnetic solenoid suction force F1 Spring load of the first spring F2 Spring load of the second spring

Claims (4)

A cylinder provided with an input port, an output port, and an oil discharge port; and a valve body that is disposed in the cylinder so as to freely stroke in the axial direction and adjusts the opening degree of the input port, the output port, and the oil discharge port; A first spring that urges the valve body in the direction of decreasing the valve opening with the spring load F1, an electromagnetic solenoid that urges the valve body in the direction of increasing the valve opening with a suction force Fs proportional to the energization amount, and the valve body And a valve body driving means for causing a stroke by a second spring that urges the valve in a valve opening increasing direction with a spring load F2,
The valve body is an output adjusted in accordance with a non-pressure regulation region from a valve closing position where energization to the electromagnetic solenoid is stopped to a pressure regulation start position, and a stroke amount corresponding to the energization amount to the electromagnetic solenoid. In a hydraulic pressure regulating valve that strokes to a pressure regulation region that generates hydraulic pressure and a constant pressure region that maintains a predetermined output hydraulic pressure,
The hydraulic control valve according to claim 2, wherein the second spring biases the valve body in the valve opening increasing direction only within the non-pressure regulating region.   2. The hydraulic pressure regulating valve according to claim 1, wherein the second spring has a free length near a boundary between the non-pressure regulating region and the pressure regulating region.   2. The hydraulic pressure regulating valve according to claim 1, wherein the second spring is locked by a stopper in the vicinity of a boundary between the non-pressure regulating area and the pressure regulating area. The hydraulic pressure regulating valve according to any one of claims 1 to 3, wherein the pressure regulation starting position is a position where the valve body opens .

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