JPS5983865A - Lubricating oil pressure regulating device in automatic transmission for vehicle - Google Patents

Abstract

PURPOSE:To make it possible to use an oil pump having a small capacity, in a lubricating oil pressure regulating device for feeding the secondary pressure oil to an automatic transmission as lubricating oil therefor, by introducing governor pressure into a secondary regulator to raise the pressure of lubricating oil in accordance with vehicle speeds. CONSTITUTION:A spool 61 in a secondary regulator valve 6 is subjected to, in the upward direction from a rand 62, governor pressure Pg from a governor 4 and the load by a spring 63, and also subjected to, in the downward direction from a rand 64, the feed-back of the secondary line pressure through a passage 102 so that the spool 61 displaces in accordance with the relative relation between both pressures to regulate the opening area of a drain port 65 for delivering the secondary pressure Ps to the passage 102, thereby pressure oil is fed to a torque converter through a lock-up relay valve 18, and as well fed to sections to be lubricated in a transmission, through orifices 52, 53. With this arrangement, lubrication may be satisfactorily made by using an oil pump having a small capacity in accordance with vehicle speeds, thereby fuel consumption may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating oil supply device that is installed in a hydraulic control device that controls an automatic transmission for a vehicle according to driving conditions, and supplies lubricating oil to the automatic transmission.

The hydraulic control device includes an oil pump that is a hydraulic source, a governor valve that generates governor pressure corresponding to the vehicle speed, a throttle valve that outputs throttle opening corresponding to 1 liter, governor pressure, A regulator valve that manually regulates the oil pressure discharged from the oil pump and outputs line pressure by adjusting the hydraulic pressure that changes depending on vehicle running conditions such as throttle pressure, and from the line pressure supplied through an orifice or the regulator valve. The discharged surplus oil is pressure regulated according to vehicle running conditions, and the secondary line pressure, which is mainly the supply pressure to the torque converter, is output, and the secondary line pressure or/and the surplus when the secondary line pressure is output is a secondary regulator valve that supplies oil as a lubricant;
It is operated by a shift lever installed in the driver's seat, and consists of a manual valve for setting vehicle driving conditions, a shift valve for supplying and discharging hydraulic servo line pressure for the automatic transmission, etc.

The lubricating oil supplied to the parts that require lubrication in an automatic transmission is usually surplus oil discharged from the secondary regulator valve or/and canary line pressure oil via the A refit. Conventionally, lubricating oil pressure is Because it was not related to the rotational speed of the automatic transmission, there were problems with the durability of automatic transmission clutches, brakes, gears, etc., which tend to run out of lubricant at high speeds when a large amount of lubricant is required. Ta.

This lack of lubricating oil can be solved by using Daikan 1's oil pump as a hydraulic power source, but this comes with the drawback of poor fuel efficiency.

An object of the present invention is to enable the lubricating oil pressure to change according to the vehicle speed or the output shaft rotation speed of an automatic transmission, and to use a small-capacity oil pump to supply a small amount of lubricating oil at low vehicle speeds. The supply amount of lubricating oil increases as the rotational speed increases, and a large amount of lubricating oil can be supplied especially at high rotational speeds, which require a large amount of lubricating oil. A lubricating oil for vehicle automatic transmissions that can improve durability, reduce engine output consumption in the oil pump, and improve fuel efficiency! l
! ! The purpose is to provide equipment.

FIG. 1 shows a hydraulic control system for a vehicle with four forward speeds and one reverse speed automatic transmission.

1 is an oil reservoir, 2 is an oil pump driven by the engine, 3 is a throttle valve that outputs the throttle pressure according to the throttle opening, and 4 is attached to the output shaft of the automatic transmission. The governor valve generates governor pressure in response to the rotational speed of the output shaft or the vehicle speed. ) is a regulator valve that receives the throttle valve or line pressure as input, regulates the pressure oil discharged from the oil pump 2, and outputs the line pressure to the oil passage 101; 6 is the regulator valve that inputs the governor pressure; 51
An oil passage 102 connected to the line pressure generation oil passage 101 via
The secondary regulator valve regulates the hydraulic pressure of the cylinder and sets the pressure in the secondary blade.L is manually operated via the shift lever installed in the driver's seat, and the valve is operated manually through the shift lever installed in the driver's seat.
N (neutral), L) (drive), S (second)
, oil passage 101 in which line pressure is generated when set to each shift position of LOW (low), oil Lrg'J--Boheno line pressure supply oil passage 104, 105, which operates the frictional engagement element of the automatic transmission. , IOG, manual valve that selectively communicates with 107, 8 is a 1-2 shift valve, 9 is 2
-3 jitsuto valve, 1o is 3-4 jino 1~valve, 11 is modulator valve to low course 1, 12 is modulator valve to rononondo course 1, 13 is 3-4 si 1 ~ switch valve, 14
1 is an electromagnetic solenoid valve that controls the shift switch valve 13, 15 is a cut-back valve, 1G is a throttle modulator valve, 17 is a roll valve, 18 is a lock-up relay valve, and 19 is a lock. upswitch valve, 2o is a hydraulic 1-lux converter equipped with a lock-up clutch 21, 22.23.24.25.
26 is an accumulator; C1, C2, and C3 are hydraulic servos of a multi-disc clutch which are frictional engagement elements of an automatic transmission; 81
．． 82.83, B4 is a multi-disc brake hydraulic servo which is also a friction engagement element.

The throttle valve 3 has a plunger R32 in contact with a cam 31 that rotates depending on the throttle angle to the throttle angle, a spool 34 connected in series to the plunger 32 via a spring 33, and is supplied from an oil path 101. Adjust the line pressure and
Output to oa.

The governor valve 4 adjusts the line pressure supplied from the oil passage 104 according to the output shaft rotation speed, and adjusts the line pressure to the J governor pressure PG shown in FIG.
is outputted to the oil passage 103.

The regulator valve 5 inputs a throttle modulator valve that corrects the throttle pressure through the HL+ passage 109 which communicates with the oil passage 108 via the throttle modulator valve 16, and when in reverse, inputs the line pressure from the oil passage 107 and discharges the oil pump 2. Adjust the line pressure PL as shown in Figure 3.
Output.

The spool 61 of the tzb secondary regulator valve 6 is connected to the oil path 1.
03 to the land 62 at the lower end in the figure and the spring load of the spring 63 (
J, is displaced from the upper end land 64 in response to the feedback of the secondary line pressure of the oil passage 102, and adjusts the area L1 of the drain boat 65 to apply the secondary line pressure Ps to the oil passage 102 as shown in FIG. Output. The secondary line pressure 1)s of this oil passage 102 is supplied to the (-) lux converter via the lock-up relay valve 18, and at the same time is supplied via the orifice 52, 53 to the parts that require lubrication of the automatic transmission. .

As described above, the lubrication oil pressure adjustment device for a vehicle automatic transmission of the present invention changes the oil pressure supplied from the oil pressure source according to the vehicle running conditions, such as the governor pressure corresponding to the vehicle speed and the throttle pressure corresponding to the throttle adjustment. The hydraulic pressure is adjusted as input,
A regulator valve outputs line pressure, and the line pressure supplied through the orifice or excess oil discharged from the regulator valve is regulated by inputting oil pressure that changes depending on vehicle running conditions and outputs secondary line pressure. In a hydraulic control device that is equipped with a secondary regulator valve that uses secondary line pressure oil and/or surplus oil discharged from the secondary regulator valve as lubricating oil for an automatic transmission, the secondary regulator valve receives governor pressure as input. , the lubricating oil pressure is increased to ν according to the vehicle speed, so
The lubricating oil pressure can be changed in response to the vehicle speed or the output shaft rotational speed of the automatic transmission, and by using a small-capacity oil pump, a small amount of lubricating oil can be supplied at low vehicle speeds, and the rotational speed can be increased. As the amount of lubricating oil increases, the amount of lubricating oil supplied increases.
In particular, a large amount of lubricating oil can be supplied at high speeds, which require a large amount of lubricating oil, which improves the durability of automatic transmission clutches, brakes, gears, etc., and reduces engine output consumption by the oil pump. It is possible to improve fuel efficiency.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram of a hydraulic control device equipped with a lubricating oil pressure adjustment device for a vehicle automatic transmission of the present invention, Fig. 2 is a graph showing governor pressure characteristics, and Fig. 3 is a J graph showing line pressure characteristics. , FIG. 4 is a graph showing secondary line pressure characteristics. In the diagram 2...Oil pump 3...Thrower 1 to 1 valve 4...Governor valve 5...Regulator valve 6...
Secantor blade regulator valve (IcllCrT?) Figure 3 Figure 2 Figure 4 Cause

Claims (1)

[Claims] 1) A regulator valve that regulates the hydraulic pressure supplied from a hydraulic source by inputting the hydraulic pressure that changes according to vehicle running conditions, such as governor pressure corresponding to vehicle speed and throttle pressure corresponding to throttle size, and outputs line pressure. and a secondary regulator valve that regulates the line pressure supplied via the orifice or excess oil discharged from the regulator valve by inputting oil pressure that changes depending on vehicle running conditions, and outputs a secondary line pressure. , secondary line pressure oil or/and secondary regulator valve to I
In a hydraulic control device that uses excess oil discharged from JI as lubricating oil for an automatic transmission, the secondary regulator valve receives governor pressure as input and increases the lubricating oil pressure according to vehicle speed. Machine lubrication hydraulic adjustment device.