JPH0437307B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is provided in a hydraulic control device that controls a vehicle automatic transmission according to driving conditions, and adjusts the hydraulic pressure supplied to each part of the automatic transmission. It relates to a hydraulic adjustment device.

[Prior Art] A hydraulic control device for an automatic transmission for a vehicle includes an oil pump as a hydraulic pressure source, a governor valve that generates a governor pressure corresponding to the vehicle speed, a throttle valve that outputs a throttle pressure that corresponds to the throttle opening, and a governor. By inputting oil pressure that changes according to vehicle running conditions such as pressure and throttle pressure, the oil pump discharges into the line pressure oil passage and adjusts it to a predetermined line pressure for supplying the hydraulic oil to the hydraulic servo of the automatic transmission. a secondary regulator valve that regulates the pressure of a lubricating oil passage to which excess oil from the regulator valve is supplied; a secondary regulator valve that is operated by a shift lever installed in the driver's seat to set a shift position; It consists of a manual valve, a shift valve that supplies and discharges line pressure to the hydraulic servo of the automatic transmission, etc.

The oil pressure in the lubricating oil passage is regulated by the secondary regulator valve to a constant pressure or oil pressure depending on the throttle opening, and the oil pressure in the lubricating oil passage is supplied to parts of the automatic transmission that require lubrication.

[Problems to be Solved by the Invention] During high-speed travel in which each part of the automatic transmission rotates at high speed, a large amount of lubricating oil must be supplied to the parts of the automatic transmission that require lubrication.

However, with conventional oil pressure adjustment devices, if the pressure regulation level of the lubricating oil pressure is set by the secondary regulator valve so that a large amount of lubricating oil is obtained when driving at high speeds, even when driving at low speeds when the oil pump's discharge amount is relatively small. A larger amount of lubricating oil than necessary is supplied to the parts that require lubrication, and there is a risk that the amount of lubricating oil supplied to the line pressure oil path will be insufficient and the required level of line pressure adjusted by the regulator valve will not be obtained. In order to satisfy both requirements, it is necessary to use a large-capacity oil pump as a hydraulic power source, which has the disadvantage that the fuel consumption of the vehicle deteriorates due to the increase in the driving torque of the oil pump.

The present invention provides an automatic transmission that can supply a predetermined hydraulic pressure to each part of an automatic transmission without increasing the capacity of the oil pump by optimally adjusting the amount of lubricating oil supplied to the parts of the automatic transmission that require lubrication. The purpose of the present invention is to provide a hydraulic adjustment device for a transmission.

[Means for solving the problems] The hydraulic pressure adjustment device for a vehicle automatic transmission of the present invention has the following features:
A hydraulic pressure source, a line pressure oil passage to which pressure oil is supplied from the hydraulic pressure source, and a predetermined line disposed in the line pressure oil passage for supplying hydraulic pressure in the line pressure oil passage to a hydraulic servo of an automatic transmission. a regulator valve that regulates the pressure; a lubricating oil passage connected to the line pressure oil passage via an orifice; a secondary regulator valve disposed in the lubricating oil passage that regulates the oil pressure of the lubricating oil passage; and a governor pressure that generates a hydraulic pressure corresponding to the vehicle speed, and the governor pressure is applied to the secondary regulator valve so that the hydraulic pressure in the lubricating oil passage increases as the vehicle speed increases.

[Operation and Effects of the Invention] According to the present invention, by connecting the line pressure oil path and the lubricating oil path through the orifice, the amount of oil in the lubricating oil path can be maintained regardless of the level of line pressure regulation by the regulator valve. is ensured, and the governor pressure corresponding to the vehicle speed is applied to the secondary regulator valve to increase the oil pressure in the lubricating oil path as the vehicle speed increases, so that the lubricant is supplied to the parts of the automatic transmission that require lubrication. The amount of oil can be small at low vehicle speeds and almost large at high vehicle speeds.

As a result, when running at low speeds when the oil pump's output is low, the amount of lubricating oil is kept small to maintain the specified line pressure, and when driving at high speeds when the oil pump's output is high, the amount of lubricating oil is increased, allowing small-capacity oil pumps to This makes it possible to supply a predetermined oil pressure to parts that require lubrication and the hydraulic servo, thereby improving the durability of the automatic transmission, and reducing the consumption of engine output by the oil pump, thereby improving fuel efficiency.

[Embodiment] FIG. 1 shows a hydraulic control system for a vehicular automatic transmission with four forward speeds and one reverse speed.

1 is an oil reservoir; 2 is an oil pump that is driven by the engine and discharges oil into the oil passage 101; 3 is a throttle valve that outputs throttle pressure according to the throttle opening; 4 is attached to the output shaft of the automatic transmission;
A governor valve 5 is provided in the oil passage 101 to generate a governor pressure corresponding to the rotational speed of the output shaft or the vehicle speed, and uses the pressure oil discharged from the oil pump 2 to the oil passage 101 as throttle pressure or line pressure as input oil pressure. A regulator valve 6 for regulating line pressure to a predetermined line pressure is provided in a lubricating oil passage 102 connected to a line pressure oil passage 101 via an orifice 51.
A secondary regulator valve that regulates the hydraulic pressure to a predetermined secondary line pressure (lubricating hydraulic pressure) using the governor pressure as input hydraulic pressure, and 7 is manually operated via a shift lever installed in the driver's seat. Frictional engagement between the automatic transmission and the oil passage 101 where line pressure is generated when the shift positions are set to (reverse), N (neutral), D (drive), S (second), and L (low). Line pressure supply oil lines 104, 105, 10 to hydraulic servos that operate elements
6,107, a manual valve that selectively communicates with
8 is the 1-2 shift valve, 9 is the 2-3 shift valve, 10
is a 3-4 shift valve, 11 is a low coast modulator valve, 12 is a second coast modulator valve, 13 is a 3-4 shift switch valve, 14 is a reservoir electromagnetic solenoid valve that controls the shift switch valve 13, 15 is a cutback valve, 16 is a throttle modulator valve, 17 is an accumulator control valve, 18 is a lockup relay valve, 19
is a lock-up switch valve, 20 is a hydraulic torque converter equipped with a lock-up clutch 21,
22, 23, 24, 25, 26 are accumulators, C1, C2, C3 are multi-disc clutch hydraulic servos that are frictional engagement elements of automatic transmission, B1, B
2, B3, B4 are multi-disk clutch hydraulic servos which are also frictional engagement elements, B1, B2, B3, B4
is the hydraulic servo of the multi-disc brake, which is also a frictional engagement element.

The throttle valve 3 has a plunger 32 in contact with a cam 31 that rotates according to the throttle opening degree, and a spool 34 connected in series with the plunger 32 via a spring 33. The throttle pressure is regulated according to the opening degree and is output to the oil passage 108.

The governor pressure 4 regulates the line pressure supplied from the oil passage 104 according to the output shaft rotation speed, and outputs the governor pressure Pg shown in FIG. 2 to the oil passage 103.

The regulator valve 5 inputs throttle modulator pressure, which is a modified throttle pressure, from an oil passage 109 connected to an oil passage 108 via a throttle modulator valve 16, and inputs line pressure from an oil passage 107 during reverse operation. to adjust the discharge pressure of the oil pump 2, and output the line pressure PL shown in FIG. 3 to the oil passage 101.

In the secondary regulator valve 6, the spool 61 receives the governor pressure Pg input from the oil passage 103 to the land 62 at the lower end in the figure and the spring load of the spring 63, and the oil passage 102 receives the spring load from the spring 63 from the upper side in the figure. The opening area of the drain port 65 is adjusted by receiving the feedback of the secondary line pressure. As a result, as shown in FIG. 4, the secondary line pressure _Ps is output to the oil passage 102, which increases as the governor pressure increases, that is, the vehicle speed increases. Secondary line pressure P _s of this oil passage 102
is supplied to the torque converter via the lock-up relay valve 18, and at the same time, the orifice 52,
53 to the parts of the automatic transmission that require lubrication.

[Brief explanation of drawings]

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 according to the present invention, FIG. 2 is a graph showing governor pressure characteristics, and FIG. 3 is a graph showing line pressure characteristics. FIG. 4 is a graph showing secondary line pressure characteristics. In the figure, 2... oil pump, 4... governor valve, 5...
Regulator valve, 6... Secondary regulator valve, 101... Line pressure oil path, 102... Lubricating oil path.

Claims (1)

[Scope of Claims] 1. A hydraulic source, a line pressure oil passage to which pressure oil is supplied from the oil pressure source, and a line pressure oil passage disposed in the line pressure oil passage to supply the oil pressure of the line pressure oil passage to a hydraulic servo of an automatic transmission. a regulator valve that regulates the pressure to a predetermined line pressure for supply; a lubricating oil passage connected to the line pressure oil passage via an orifice; and a secondary valve disposed in the lubricating oil passage that regulates the oil pressure of the lubricating oil passage. It includes a regulator valve and a governor valve that generates oil pressure corresponding to the vehicle speed, and the governor pressure is applied to the secondary regulator valve so that the oil pressure in the lubricating oil path increases as the vehicle speed increases. A hydraulic adjustment device for a vehicle automatic transmission, which is characterized by: 2. The secondary regulator valve has a spool on which the governor pressure and the oil pressure of the lubricating oil passage act oppositely, and the area where the lubricating oil passage opens to the drain port is adjusted by displacement of the spool. A hydraulic pressure adjustment device for an automatic transmission for a vehicle as set forth in claim 1.