JPS5986739A - Constant pressure valve - Google Patents

Abstract

PURPOSE:To surely prevent a valve from sticking by a method wherein the form and dimensions of a spool is set to have specified relationships to an inlet port an outlet port, and a drain port in a constant pressure valve most suitable for the hydraulic control device of a vehicular automatic transmission. CONSTITUTION:A constant pressure valve consists in slidably housing a spool 4, which has a first land 6 to open and close an inlet port 1 and a second land 7 with the diameter larger than that of the land 6 to adjust the amount of oil discharged from a drain port 5, in a bore, within which the inlet port 1, the outlet port 2, and the drain port 3 are provided, and energizing said spool 4 downwards by means of a spring 5. In this case, the drain port 3 is covered by the second land 7 at all times and the discharge of pressure oil through said port 3 is contrived to be performed through a clearance between the outer peripheral wall of the second land 7 and the inner peripheral wall of the bore. Furthermore, the increase and decrease of the amount of said discharged oil can be controlled by changing the distance L laying between the end of the second land 7 and the end of the drain port 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a constant valve installed in a hydraulic circuit that lowers the level of supplied pressure oil to a constant value set by a spring and outputs the same.

Conventionally, as shown in FIG. 1, there are an inboard 101, outboards 1 to 102, a drain boat 103, etc., a first land 104 for opening and opening the inboard 101, a second land 105 for opening and closing the drain boat 102, and the above-mentioned Arara. 1-
1st land 104 contacted boat 7iV 11,'l
has an oil chamber 10G between the land 105 and the second land 105;
It receives the spring catch type of the spring 107 which is applied from the upper part of the figure, and receives the output hydraulic pressure of the outboards 1 to 102 or the pressure oil supplied to the inboards 1 to 101 from the other J. It has a spool 108 that changes l'l+, and inboard 101. A constant pressure valve is used that adjusts the opening area of t3 and drain 1-103 to maintain a constant pressure from Ara 1-Small I/102 and outputs hydraulic pressure or pressure oil.

However, in the conventional constant pressure valve of this type, the ratio tL/oil j1 supplied from the invoices 1 to 101 is ﾾ, and therefore the oil chamber 10
6a5 Lisbourg 1 () 8, which has a high hydraulic pressure, is displaced upward in the figure, and the inboard 101 is closed by the first land 104, and the drains I to 103 are connected to the second land 1.
Between 11 and 05! Ruyo Land J3. J: Bibo 1
The location and size were set. For this reason, solids such as cutting chips that exist in the pressure oil are removed from the drain boat 1 when it is opened.
() 3, and when the drain 1- closes and moves, the sentence pal 1 gets caught between the boat edge and the land edge.
When the stick is activated, the U1 output oil pressure suddenly drops in level.
This was causing the problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a constant pressure valve that can reliably prevent such valve leakage by keeping the flow passage cross-sectional area of the drain portion constant at all times.

Next, the present invention will be explained based on one embodiment shown in Section A.

Δ indicates such a constant pressure valve of the present invention, 1 indicates inbow 1-,
2 is the port to the side 1, 3 is the drain boat, 4 is the spool, 5 is the spring installed in front, 6 is the first land of the spool 4 that closes the inboard 1 to 1, 7 is the first land 6J
: The second land 8 has a large diameter and adjusts the amount of oil discharged from the drain boat 3, and is an oil chamber between the first land 6 and the second land 7, and is always in communication with the outboard 1-2. There is a C.

This constant J] two valves △ (J, the oil pressure supplied from the inboard 1-1 becomes higher, which causes the oil pressure in the oil chamber 8 to become higher,
For example, if the spool 4 moves from the position shown by the dashed line to 1 of the solid line,
The first land 6 is firmly blocking the inboard 1, and the drain port 1-3G is still blocked by the second land 7. Changes in oil output from Trembaugh 1 to 3 on October 11 are as follows:
-, non-door 0) Between the oil chamber 8 side end 7B of the second land 7 and the drain port 1 in the gap S between the inner wall 7△ and the inner peripheral wall 98 of the pal f hole 9 into which the spool 4 is inserted. edge of ~; one
This is done by changing the distance 11111L between 3 and 3. When the size of the gap S is constant and does not change, it is possible to prevent solid objects such as cutting chips, which cause a burnout suction, from becoming trapped and causing the valve to fail.

The above invention (') adjusts the output section by increasing/decreasing the supply pressure parts from the inboard 1 and from the drains 1-3.

No. 1" 1 Adjust the oil pressure to increase or decrease, and set the output oil pressure of □ from the Ara 1 port (I try to keep it at Bi 1, but
Oh! -Po 1~/p l's output oil! ■ key v? In order to do this, it is also possible to increase or decrease the load of the IN oil at the drain boat, and to determine whether the output pressure oil is supplied at the first point or the other. The explanation will be based on the hydraulic control of automatic transmission.

10 is a fluid type 1-luke converter 11, forward 4 stages, reverse 1
A vehicular automatic transmission 30 is a hydraulic control device that automatically shifts the speed of the vehicular automatic transmission in accordance with vehicle running conditions.

1 to the transmission 12 are equipped with a multi-disc clutch CO operated by a hydraulic servo 13 and a multi-disc brake E30 operated by a hydraulic servo 14, an overdrive device 15 for obtaining the fourth speed, and a hydraulic servo A multi-disc clutch C1 operated by 1G, a multi-disc clutch C2 operated by hydraulic servos 17 and 18, a multi-disc brake B1 operated by hydraulic servo 19, and a multi-disc brake B1 operated by hydraulic regulator 20 and 21. The hydraulic control device 30 includes a plate brake B3 and an underdrive device F122 for shifting three forward speeds and one reverse speed (!).
Oil sump 31.1 is driven by the engine and discharges pressure oil from the oil sump 31 to the oil passage 201 according to the vehicle running condition 1'1, such as medium speed and thrower distance. Adjust the oil pressure in the oil passage 201 and take the line pressure/-Huff 7 regulator valve 33, primary oil +) Adjust r according to '+, [sit torque converter 1
1, supply of lubricating oil to the transmission 12, and circulate the hydraulic oil to the Jj and A oil coolers.Secondary line regulator valve 34, oil passage 201
The line pressure is adjusted according to the engine's torque level, and the line pressure is outputted to the oil line 203. et4t/
ζJino] - Spool 3G1 linked to the lever (JL,
P (Park), R (Reverse), N Corral), D (1~Live), 2 (Recando), set by the Ministry of Driving.
At each position of L(o-), the line pressure supply oil kll 2+1 to the oil passage 2()1 and the hydraulic servo, etc. +-・
208, the manual valve 3G is connected to the output shaft 23 of the automatic transmission, and the line pressure is supplied from the oil line 20G to the governor pressure corresponding to the output shaft rotation speed to supply oil. Governor valve 31 outputs to passage 204, oil passage 2 from one side
The manual valve 36 has a spool 381 to which the governor pressure of 04 and the throttle pressure of the oil passage 203 are applied from the other side.
When the range and 2 range are set to 1c, when the spool 381 is set six positions downward in the figure due to the equilibrium between the governor pressure and the throttle pressure, the oil J1 of the brake B1] servo 1
Pressure is discharged from the oil passage 210 connected to the oil passage 209 through the 2-3 shift valve 39J3 and the oil passage 209 to set the first speed. The 1-2 shift valve 38 engages B1 to set the second speed, and also inputs the governor pressure and throttle pressure to maintain the oil passage 210 at line pressure when the spool 391 is set to the downward direction as shown, and also maintains the oil pressure of the clutch C2. Discharge the communication oil passage 211 to the servo 18 and return to second gear, and when the spool is set upward in the figure, connect the oil passage 209 and the oil passage 211, etc., engage the clutch C2, and release the brake B1.
The 2-3 shift valve 39, which releases the 3rd gear and changes the balance between the governor pressure and the throttle pressure, also changes the balance between the governor pressure and the throttle pressure. drains the connecting oil passage 212 of the hydraulic servo 14/\ of the brake [30, and drains the oil J1 of the clutch Go
The communication oil pressure 213 to 3 is connected to the oil 'JR201' to which line pressure is supplied via the manual valve 33, and the spool is set to the upward direction in the figure. The contact is made to engage the play 1130, exhaust the pressure in the oil passage 213 and release the clutch 00, and the 4th gear and J
3-4 jet valve 40.2-(T-1~Timing valve 41.3-2 kickdown Δrenoise control)・Roll valve 42, low speed IT, router valve 43, reverse spray 4 - Seek l system valve 44, gear modulator valve 45, cutback valve 46.1] -2 Down timing valve 47, exhausts pressure from hydraulic servo 13 of clutch CO.

Upper chisel 1 to valve 48, reverse clutch seek Lance valve 49, Aki comb regulator 5o for Clap 01, Brake 131 River No. I: 1-1-Mouret-'251, Cry'f
- Inner piston no' for C2 = t- Neemulator b2
, control switch 53, electromagnetic solenoid valve 54J
3J: Consists of a detent regulator valve 10.

Deten 1 to regulator valve 70 have the configuration of a pressure regulating valve according to the present invention, and connect to oil passage 201 and are supplied with line pressure.
I contacted / Udobo 1-12, Drain Port 73,
A spool 74, a spring 15 installed in front on one side, a first land 7G that opens and closes 11 to the inlet 1, a second land 77 that opens the drain 1-73, and a constant contact with the rear boat 72. 11 land 1G and an intermediate oil chamber 78 between the second land 77, the spool 74 receives the spring load of the spring 15 from one side, receives the dip pressure of the oil chamber 78 from another force, and is displaced at 207 is high, and as a result, when the pressure increases, the spool 74 is displaced upward as shown in the figure, the first land IG closes the inboard 11, and the line pressure is no longer supplied to the oil chamber 18. Even in the reduced state, the second land 77 has a drain 1
-73 is not shown in Fig. 2, but as in the embodiment, the outer periphery of the second land 77 and the inner periphery of the valve hole are closed with two parts remaining, and the amount of oil discharged from the drain 1-73 (, I , is determined by the length of the above-mentioned middle and return distance. When the pull-down plug 351 is displaced upward in the figure, the oil passage 221 connects the kick-down plug 3j)1 to the pressure supply oil passage 222. Contact 1-2 Jinodobu 1゛, 2-3 Jet valve 3), 3-4 Shift 1-Valve 40, each slide 381, 3
91, 401, 1" dipunto L in the same direction as the throttle pressure.
1 to 14 is applied to suppress a sudden downshift, and accordingly, the output shaft torque of the automatic transmission is rapidly increased. In this state, the dipunto pressure is
・In addition to 1 no 1 oil h1 from 73 - (throttle valve kickdown plug, pal hole, gap, 1-2 shift 1~
The spools of the valve, 2-3 shift valve HLJ, and 3-4 valve HLJ and these mails are fitted.1. :The set oil pressure is determined by the leakage of oil from the gap with the valve hole.

As described above, the constant pressure valve of the present invention has an import port, a first land for opening and closing the outboard, and a second land for opening and closing the outboard port, and the spring load from the pre-installed spring is applied from one side to the other in an alternating manner. From the usage, it has an output hydraulic pressure output from the inbow 1- or a spool that is displaced by applying hydraulic pressure to the inbow 1-.
~A3 J: In a constant pressure valve that adjusts the pressure oil supply and discharge from outboard 1 and drain 1 to cover the output of the hydraulic pressure for a given month from outboard 1, drain 1 is always closed by the second land. The setting is as follows, and the discharge of pressure oil from drain 1 is as follows.
This is done through the gap between the outer peripheral wall of the second land and the inner peripheral wall of the valve hole, and the increase or decrease in the drained oil m is performed by changing the distance between the end of the second land and the end of the drain 1. The flow path cross section of the drain section can always be kept constant, and valve sticking can be reliably prevented.

4. Accurate drawings 47 ijJ Akira Figure 1 is a top view of a conventional constant pressure valve, Figure 2 is a top view of a constant pressure valve of the present invention, and Figure 3 shows an embodiment of a related invention. This is a hydraulic circuit diagram of a hydraulic control device for a dual-purpose OJ transmission (not shown).

In the diagram: 1, 11...r board 1-, 2, 72...outboard 1, 3, 73-...- 1'board, 4
, 74-...Spool, 5, 75...Spring, 6
, 76... 1st land, 1, 77... 2nd non-t, 8, 78... Oil chamber between the 1st land and the 2nd land.

Claims (1)

[Scope of Claims] 1) It has a first land for opening and closing the importer, an outboard 1-, a drain boat, and a second land for opening and closing the inboard 1-, and - -n to V
g Tosasa ty K Receives the spring load from the suge ring, and the output oil pressure output from the boat from the other side.
The hydraulic pressure supplied to the import is applied to the spool, which is displaced, and the amount of pressure oil supplied and discharged from the inboard and drain boats is adjusted to maintain a constant level of oil JJ (!j'Udbo I~ Drain 1 is set so that it is always closed by the second land 1), and the pressure oil from drain 1 is discharged through the outer peripheral wall of the second land and the valve hole. A constant 11 valve, characterized in that the amount of discharged oil is increased or decreased by changing the distance between the second land end and the drain end. 2) Inboard, Arara 1-Port, and Drainbow 1
・The first land a to import ll1lI3J]
3 and a second land for opening and closing the drain 1.
Receives a spring load from a spring installed backwards from one side,
The output oil pressure output from the outboard 1 or the inboard (-) is applied to the spool to cover the displacement, and the inboard and the drain 1 to
Adjust the pressure oil supply from IJI and output a constant oil pressure from the boat to the constant pressure valve Δ3, and set the drain boat so that it is always closed to the second land. , the discharge of pressure oil from drain 1- is as follows:
The amount of drained oil is increased or decreased by changing the distance between the end of the second land and the end of the drain boat. A constant pressure valve characterized by forming a partial discharge port for output pressure oil downstream. 3) The constant pressure valve is installed in the hydraulic control circuit of the vehicle automatic transmission 1jlt, and is equipped with a detent 1 equipped with an inboard to which line pressure is supplied and an outboard that outputs dipunto pressure to the 1st shift valve via the throttle valve. -It is a regulator valve, and Ara 1~
A partial discharge port for the output pressure oil formed downstream of the boat is characterized by being a gap between each spool of the throttle valve and shift valve and each valve hole into which each spool is fitted. A constant pressure valve according to claim 2.