JPS58106254A - Automatic speed change gear for car - Google Patents

Abstract

PURPOSE:To speed up the rise of the operating oil temperature and reduce a power loss at the time of starting by stopping flowing of an operating oil into an oil cooler when the temperature of the operating oil of an automatic speed change gear is below a setpoint. CONSTITUTION:Operating oil is sucked up from an oil reservoir 1 by an oil pump 2 and discharged to an oil path 11 so as to be fed to an escape valve 51, the second escape valve 52, a direct-coupled clutch control device 6 and a torque coverter 3. An oil temperature sensor 81 is mounted in an oil flowing path 13 to an oil cooler 4, and when the temperatue of the operating oil is lower than a setpoint, a solenoid valve 83 is operated to flow the operating oil into the oil reservoir 1 through an oil path 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicular automatic transmission equipped with a hydraulic oil rapid temperature raising mechanism that can rapidly raise the temperature of hydraulic oil to an appropriate temperature.

An automatic transmission for a vehicle consists of a transmission device such as a planetary gear transmission mechanism operated by a hydraulic servo or a belt-type continuously variable transmission, a torque converter, fluid couplings such as a fluid coupling, and a system that connects these to the vehicle's operation ( The vehicle is equipped with a hydraulic control device that controls the vehicle according to driving conditions, and further includes an electric control device that electrically detects vehicle operating conditions and controls the hydraulic control device. In this automatic transmission, hydraulic oil is sucked up from an oil reservoir by an oil pump, the pressure is regulated by a hydraulic control device, and then supplied to the transmission and fluid coupling.
To prevent problems such as a drop in specific gravity, the oil is cooled in an oil cooler before being returned to the oil reservoir. In general, when the temperature of hydraulic oil is low, the viscosity is high and the loss of transmission efficiency due to friction becomes large, so it is desirable to quickly raise the temperature to an appropriate temperature of about 80 degrees Celsius at the time of cold start operation. However, in conventional automatic transmissions for vehicles, a portion of the hydraulic oil flows into the oil cooler even before the hydraulic oil reaches an appropriate temperature, which slows down the rise in hydraulic oil temperature and increases power loss, especially in cold regions. It was causing this.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic transmission for a vehicle that can quickly raise the temperature of hydraulic oil and reduce power loss during startup.

Next, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows the main parts of the hydraulic control circuit of an automatic transmission. 1 is an oil reservoir, 2 is an oil pump driven by the engine,
3 is a torque converter with a direct coupling clutch 31, 4 is an oil cooler, 5 is a hydraulic control device, 51 is a pressure regulating valve, 5
2 is a 211th pressure valve, 53 is a throttle valve, and 6 is a control device for the direct coupling clutch 31. Hydraulic oil is sucked up from the oil reservoir 1 by the oil pump 2 and discharged into the oil passage 11, and the pressure is regulated by the pressure regulating valve 51 to a line pressure according to the throttle opening, vehicle speed, or reduction ratio, and the hydraulic oil is transferred from the hydraulic control device to the transmission. is supplied to a hydraulic servo (not shown). The remaining surplus oil whose pressure has been regulated to the line pressure in the pressure regulating valve 51 is discharged to the oil passage 12, and is supplied from the oil passage 12 to the second pressure regulating valve 52, and is also connected to the oil passage 12A branched from the core oil passage 12. Directly coupled clutch control device through! 6, and is further supplied to the cough direct clutch control device l! 6, when the direct coupling clutch is disengaged (torque converter type B111?), it is supplied to the torque converter 3 via the oil path 12B, and from the torque converter, the oil is returned to the direct coupling clutch control @116 via the oil path 12C, and from the oil path 12D. Inflow oil passage 13 for hydraulic oil to oil cooler 4
When the direct coupling clutch is engaged (in a lock-up state), the oil flows from the oil passage 12G through the orifice 12E, the oil passage 12D and the oil passage 13, and flows into the oil cooler 4 from the oil cooler to the oil sump. Return to 1.

Reference numeral 7 denotes a relief valve provided in the inflow oil path 13 to the oil cooler 4, and when the oil pressure in the oil path 13 exceeds a set value, the hydraulic oil is directly discharged to the oil reservoir 1 without going through the oil cooler. The oil pressure supplied from the oil passage 12 to the second pressure regulating valve 52 is regulated according to the throttle opening degree, and is supplied from the oil passage 14 as lubricating oil to the parts that require lubrication of the automatic transmission.
Excess oil at the Il pressure valve returns directly to the oil sump 1 from the oil path 15. Reference numeral 8 denotes a hydraulic oil rapid temperature raising mechanism attached to the oil passage 13, which controls the hydraulic oil in the oil passage 13 to the oil cooler 4 when the oil temperature in the oil passage 13 is below a set value (for example, 70 degrees Celsius). Oil passage 16 without intervening
The hydraulic oil is returned directly to the oil reservoir 1 to prevent the hydraulic oil from being cooled in the oil cooler 4 and to increase the rate of temperature rise of the hydraulic oil.

FIG. 2 shows an embodiment of the hydraulic oil rapid temperature increase mechanism 8. 81
83 is an oil temperature sensor attached to the oil cooler inflow oil passage 13 for hydraulic oil and detects the oil temperature in the oil passage 13; 83 is an oil temperature sensor attached to the oil passage 13 when the oil temperature in the oil passage 13 is lower than a set value; 82 is a control circuit; 82 is a control circuit; 82 is an electromagnetic valve that opens a valve port by the output of 81 and causes hydraulic oil in oil passage 13 to flow into oil passage 16;

FIG. 3 shows another embodiment of the hydraulic oil rapid temperature increase mechanism 8.

84 is provided in an oil passage 85 provided to communicate the oil passage 13 and the oil passage 1B, and when the oil temperature in the oil passage 13 is below a set value, the oil inlet 18 of the oil passage 16 is opened, and the oil passage 16 is opened. This is a bimetallic valve that closes the oil inlet 18 of the oil passage 16 when the oil temperature 13 is above a set value.

As described above, the automatic transmission for a vehicle of the present invention includes a transmission operated by a hydraulic servo, a fluid coupling, and hydraulic oil sucked up from an oil reservoir by an oil pump to the transmission and fluid coupling, and is configured to operate under vehicle running conditions. A hydraulic control system for controlling the transmission and the integral joint according to the transmission, an oil reservoir for the hydraulic oil returned from the transmission, the fluid coupling, and the hydraulic control training, and an oil cooler for cooling the hydraulic oil. Automatic transmissions for vehicles equipped with this system are equipped with a hydraulic oil rapid temperature increase mechanism that stops the flow of hydraulic oil into the oil cooler when the hydraulic oil temperature is below a set value, so the hydraulic oil section can be heated quickly. , power loss during cold starting can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram showing an embodiment of the automatic transmission for vehicles of the present invention, Fig. 2 is a configuration diagram showing an embodiment of the hydraulic oil rapid temperature rise mechanism, and Fig. 3 is a hydraulic oil rapid rise mechanism 1lIII. FIG. 7 is a configuration diagram showing another embodiment of the structure. In the diagram 8... Hydraulic oil rapid temperature rise mechanism 2nd day

Claims (1)

[Scope of Claims] 1) A transmission operated by a hydraulic servo, a fluid coupling, and hydraulic oil sucked up from an oil reservoir by an oil pump to the transmission and fluid coupling, according to vehicle running conditions. Hydraulic control to control transmissions and fluid couplings @
In a vehicle automatic transmission equipped with a pupil, an oil reservoir for the hydraulic oil returned from the transmission, the fluid coupling, and the hydraulic control device, and an oil cooler for cooling the hydraulic oil, when the concentration of the hydraulic oil is below a set value. An automatic transmission for a vehicle, characterized by being provided with a hydraulic oil rapid temperature increase mechanism that stops hydraulic oil from flowing into an oil cooler. 2) The hydraulic oil rapid temperature increase mechanism consists of an oil temperature sensor and an electromagnetic solenoid valve that is attached to the hydraulic oil inflow path to the oil cooler and is activated by the sensor, and is activated when the hydraulic oil temperature is below a set value. 2. The automatic transmission for a vehicle according to claim 1, wherein the oil is returned directly to the oil reservoir from the valve port of the electromagnetic solenoid valve. 3) The hydraulic oil rapid temperature increase mechanism consists of a bimetal that deforms according to the temperature of the hydraulic oil, and a valve that is attached to the hydraulic oil inflow oil path to the oil cooler and opens and closes the valve opening by the deformation of the bimetal. 2. The automatic transmission for a vehicle according to claim 1, wherein the hydraulic oil is returned directly to the oil reservoir from the valve port when the oil temperature is below a set value.