JP3087326B2 - Regulator valve for automatic transmission hydraulic control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regulator valve for a hydraulic control device in an automatic transmission for a vehicle.

[0002]

2. Description of the Related Art In a hydraulic control device of an automatic transmission for a vehicle, a pressure of a hydraulic oil discharged from a pump is controlled according to a vehicle speed and a throttle opening as a regulator valve.
A primary regulator valve for outputting a line pressure serving as a base pressure of an engagement pressure (a pressure corresponding to an engine torque) required for engagement of a friction engagement element of the transmission is provided. Such a line pressure must not be higher than necessary in order to prevent a shift shock at the time of engagement of the friction engagement element and improve fuel efficiency, and also prevent the friction engagement element from slipping. It must not be too low in a sense. Therefore, the line pressure is set so as to fall within a predetermined width in consideration of the pressure control fluctuation of the primary regulator valve. Conversely, if such a pressure fluctuation width can be suppressed to a small value, efficient control can be performed with the line pressure reduced to the minimum necessary, so that the pressure control fluctuation of the primary regulator valve is reduced as much as possible. It is desirable to be small.

The primary regulator valve has a structure in which the supplied pump discharge pressure is adjusted by increasing or decreasing the drain amount to obtain a line pressure. Therefore, when the throttle opening is small and a high line pressure is not required, the primary regulator valve is large. The drain amount must be secured, but if the valve diameter is small, the area of the drain opening is naturally restricted, and the required drain amount cannot be obtained even when the valve spool stroke is at the maximum, and the line pressure is increased more than necessary. This can result in rising. Further, when the opening area is increased to obtain the required drain amount, the stroke amount of the spool required to change the drain amount increases, and there is a problem that pulsation of the line pressure occurs.

Under these circumstances, in order to improve the pressure control performance of the primary regulator valve by preventing the line pressure from rising and pulsating as described above, it is necessary to increase the spool diameter without increasing the valve stroke. It is desirable to ensure a sufficient flow rate.

[0005]

However, increasing the diameter of the primary regulator valve results in an increase in the pressure receiving area of the spool, and a set of springs that opposes the line pressure applied to the spool end as a feedback signal. The load must also be large, necessitating the use of setting a long natural length coil spring to a high compression state. In other words, the set load must be increased without changing the spring constant. The reason why the natural length must be lengthened to increase the set load is that the absolute pressure of the signal is increased by increasing the diameter of the valve, but the change in the signal pressure is not increased.

Conventionally, a method of setting a coil spring of a primary regulator valve has been disclosed in
There is a technique disclosed in Japanese Patent No. 45154. In this setting method, the base end of the coil spring is simply supported on the end face of the spring receiver. If such a method is applied to a valve with an enlarged diameter as it is, a coil spring with a longer natural length and a higher set load will cause buckling as described above, and as a result, the coil peripheral surface will be in the valve hole. Sliding contact causes a change in the spring characteristics and an increase in the sliding resistance of the spool due to damage to the valve hole made of aluminum by a steel spring, resulting in a loss of the operating characteristics of the primary regulator valve. So, these problems
Japanese Patent Laid-Open No. 64-58861 discloses a technique for solving the problem.
There is a technique disclosed in the
A configuration that extends the outer circumference and supports the outer circumference of the coil spring
Is adopted. However, in such a configuration,
A plunger that applies signal pressure to the pool
The valve length must be arranged in series with the ring.
Becomes significantly longer.

In view of such circumstances, the present invention is regulated hydraulic Rising to push and a pulsation preventive Gutame, valve
Without increasing the length, increase the diameter of the valve and
Aims to improve the hydraulic control performance of the turbulator valve
And

[0008]

Means for Solving the Problems To solve the above problems, the present invention is provided in a hydraulic control device of an automatic transmission for a vehicle, receives feedback of pressure to be adjusted at one end, and receives the other end. A regulator valve that opens and closes a drain port by a sliding displacement in a valve hole of a spool that receives a spring load of a coil spring and another signal pressure through a plunger on the side, and regulates the pressure. Wherein the spring receiver and the plunger of the coil spring are disposed therein, the spring receiver includes a small-diameter portion having a reduced outer periphery, a step portion connecting the outer periphery and the small-diameter portion, and a sliding portion inside the small-diameter portion. A sleeve having an axial hole forming a moving surface, the coil spring having an operating end abutting on the spool, and a base end side abutting and supporting a step portion through an outer periphery of a small diameter portion of the sleeve. And the plunger is smaller in diameter than the coil spring.
Slidably inserted in the axial hole inside the leave
And at the inner diameter side of the coil spring abuts on the spool.

[0009]

In the regulator valve according to the present invention having the above configuration, the outer circumference of the sleeve is reduced in diameter to form a small-diameter portion and a step connecting the outer circumference and the small-diameter portion. By supporting the base end side to the stepped portion through the outer periphery of the small diameter portion of the sleeve, a considerable portion of the entire length of the coil spring can be arranged in a form that cuts into the periphery of the sleeve.
The spool contacts the spool on the inner diameter side of the coil spring.
To slide in the axial hole inside the sleeve,
Since the operating area of the plunger sliding inside the small diameter portion and the operating area of the coil spring can be arranged to be wrapped in the radial direction, an increase in the valve length can be prevented.

Therefore, according to the present invention, the valve length
The diameter of the valve can be increased without increasing the
And tone push to pressure Rising and pulsating prevented by ensuring a sufficient drain amount by increasing the diameter of the valve, to improve pressure control performance of the regulator valve, and suppressed it by adjusting push to the variation range of the pressure, Efficient control of the automatic transmission can be performed. Also, even if
Coil spring buckling is about to occur
Even the small diameter of the sleeve can prevent it
You.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a primary regulator valve.

As shown in FIG. 1, this valve has a spool 2 slidably fitted into a valve hole 10 of a valve body 1 and a valve 2 fitted at one end of the valve hole 10 to prevent the valve from falling off. A sleeve 3 serving also as a spring receiver, a plunger 4 slidably fitted in the sleeve 3, and a coil spring 5 disposed in a compressed state between the spool 2 and the sleeve 3.

To explain the detailed structure of each part, the valve hole 10 of the valve body 1 is formed as a stepped hole whose upper part is reduced in diameter. The peripheral groove 11 formed at the uppermost part of the reduced diameter portion has a feedback port 11A that communicates with the line pressure oil passage via an orifice. A circumferential groove 12 is formed in the step portion of the small diameter portion and the large diameter portion, and communicates with the balance port 12A. In the upper half of the large-diameter portion, three adjacent circumferential grooves 13, 14, 1
5 are formed, and the uppermost circumferential groove 13 in them is formed.
Is the drain port 1 that leads to the oil passage on the suction side of the pump.
3A, and a peripheral groove 14 at the middle stage is provided with an inlet port 14A communicating with a discharge side oil passage (line pressure oil passage) of a pump (not shown).
And the lower peripheral groove 15 has an outlet port 15A communicating with the inlet oil passage of the secondary regulator valve. A throttle signal input port 16A communicating with the throttle pressure control valve via an orifice, a throttle signal output port 16B communicating with the pressure receiving chamber of the secondary regulator valve via the orifice, and a reverse pressure are provided in the lower half of the large diameter portion. A reverse signal input port 17A communicating with the oil passage via an orifice is formed.

The spool 2 is located at the small diameter portion and has a circumferential groove 11.
Land 21 which separates the peripheral groove 12 from the peripheral groove 12, a large land 22 which is located in a large diameter portion below the peripheral groove 12 and separates the peripheral groove 12 and the peripheral groove 13, A land 23 having a large diameter for separating and communicating the groove 13 and the circumferential groove 14 and a land 24 located at the lowest position for separating and communicating the circumferential groove 14 and the circumferential groove 15 are provided. Is
A generally frustoconical cone having a radial support peripheral surface that fits on the inner periphery of the working end side circulating portion of the coil spring 5 and that centers the working end side of the coil spring 5 and a contact end surface that contacts the upper end surface of the plunger 4. A block 25 is formed to extend.

The sleeve 3 is provided with a bottomed axial hole 31 along the center axis thereof, and the upper portion of the peripheral surface is reduced in diameter, so that the base portion of the coil spring 5 is closed at the outer periphery of the small diameter portion 32.
Through the sleeve 3 and cut into the sleeve 3
It has a configuration that. A circumferential groove 33 is formed at the center of the circumferential surface of the sleeve 3, and the groove 33 communicates with the reverse signal input port 17 </ b> A through the axial hole 10 through a small radial hole 34.

The upper end, which is the working end, of the coil spring 5 is supported in contact with the lower end surface of the land 24 of the spool 2, and the inner periphery of the revolving portion near the upper end is circumferentially supported by the supporting peripheral surface of the block 25. while being abutted supports the lower is proximal to the stepped portion 35 connecting the outer periphery 30 and a small diameter portion 32 of sleeve 3.

In the primary regulator valve configured as described above, the inner periphery of the circulating portion on the working end side of the coil spring 5 is supported in a centered state by the supporting peripheral surface. be set to, prevents cause buckling by circumferential inner peripheral support accurate centering and near both ends, as a result, the coil the coil spring 5 is stretch without its circumferential outer circumference is in sliding contact with the valve hole 10 It can be displaced.

Therefore, according to the primary regulator valve of the above embodiment, the pressure control performance of the primary regulator valve can be improved by preventing the rising and pulsation of the line pressure, whereby the pressure fluctuation range of the line pressure can be reduced. It is possible to perform efficient control of the automatic transmission while keeping it small. In addition, since a sufficient opening area can be secured by increasing the valve diameter, the stroke of the spool can be reduced, and a considerable portion of the entire length of the coil spring can be arranged in a form in which it is cut into the periphery of the spring receiver. Together with this, it has the effect of shortening the valve length.

Although the operation of the primary regulator valve of the above embodiment is not particularly different from that of the conventionally known valve, it will be briefly described with reference to the circuit diagrams shown in FIGS. 2 and 3 for reference. The operation is as follows.

In the hydraulic control circuit shown in the figure, the oil sucked up from the oil pan via the strainer is discharged from the pump P, supplied to the manual valve M through the line pressure oil passage L, and switches the range of the manual valve M. Is supplied to the hydraulic servos C-0 to C-3, B-1, and B-2 from the ports corresponding to the respective ranges via shift valves S1 to S3, accumulators A1 to A4, and the like.

By the way, for the above-mentioned reason, the line pressure must not be too high or too low. Therefore,
A primary regulator valve R1 for controlling the pressure of hydraulic oil discharged from the pump P according to the vehicle speed and the throttle opening is connected to the line pressure oil passage L.

As shown in FIG. 1, the spool 2 of the primary regulator valve R1 is provided with a feedback pressure of a line pressure applied to an end face of a land 21 at an upper end thereof and a coil applied to a lower end of a land 24 opposed thereto. Depending on the balance between the spring load of the spring 5 and the throttle signal pressure output from the throttle pressure control valve T, between the lowest position shown in the left half of the drawing and the highest position shown in the right half of the drawing, It moves up and down according to the balance of force to take an appropriate position. By this action, the land 23
And the land 24 adjust the flow passage area between the circumferential groove 14 and the circumferential groove 13 and between the circumferential groove 14 and the circumferential groove 15. When the feedback pressure is high or the throttle signal pressure is low, the drain oil amount and the secondary The line pressure is decreased by increasing the amount of oil to the regulator valve R2, and in the opposite case, the oil amount is decreased to increase the line pressure and to maintain a predetermined value.

The plunger 4 rises when reverse pressure is input by switching the range of the manual valve M, contacts the lower end surface of the spool 2 and increases the upward force to increase the line pressure. Act like.

Although the present invention has been described in detail based on an embodiment in which the concept of the present invention is applied to a primary regulator valve, the present invention is not limited to the application to the above-mentioned valve, but is applied to another regulator valve, that is, a pressure regulating valve. It is needless to say that the present invention can be implemented by changing the specific configuration of various details within the scope of the matters described in the claims.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a primary regulator valve.

FIG. 2 is a circuit diagram showing one half of a circuit of a hydraulic control device incorporating the primary regulator valve.

FIG. 3 is a circuit diagram showing another half of the circuit of the hydraulic control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Valve body 2 Spool 3 Sleeve (spring support) 4 Plunger 5 Coil spring 10 Valve hole 13A Drain port 30 Outer periphery 31 Axial hole 32 Small diameter portion 35 Step

Continuation of the front page (56) References JP-A-64-12180 (JP, A) JP-A-4-113066 (JP, A) JP-A 64-58861 (JP, A) JP-A 64-55465 (JP) JP-A-61-109955 (JP, A) JP-A-61-45154 (JP, A) JP-A-2-110749 (JP, U) JP-A-63-30652 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (1)

(57) [Claims] An automatic transmission for a vehicle, which is disposed in a hydraulic control device, receives feedback of pressure to be adjusted at one end, and receives a spring load of a coil spring and another signal pressure via a plunger at the other end. A regulator valve that opens and closes a drain port by sliding displacement in a valve hole of a spool that receives the pressure and regulates the pressure, wherein a spring receiver of a coil spring and a plunger are disposed in the valve hole. In the above, the spring receiver is a sleeve having a small-diameter portion whose outer circumference is reduced, a step connecting the outer circumference and the small-diameter portion, and an axial hole forming a sliding surface inside the small-diameter portion, coil spring, the spool is brought into contact with working end in and the base end is contact supporting a stepped portion through the outer periphery of the small-diameter portion of the sleeve disposed within the valve bore, said plunger, said Koirusu Smaller diameter than pulling
Slidable in an axial hole inside the sleeve
And abutment against the spool on the inner diameter side of the coil spring.