KR0174190B1 - Hydraulic flowing control device for a/t - Google Patents

Abstract

In order to improve the operating performance of the transmission by reducing the amount of oil flowing to the oil cooler at a low temperature and allowing the oil to flow at a high temperature to reduce the trouble such as air inflow at a low temperature and increase the cooling efficiency at a high temperature, An oil pump for generating a hydraulic pressure by a drive gear; The oil pressure discharged from the oil pump is drawn into a plurality of control valves through a conduit, and the oil pressure is supplied to a plurality of friction elements, thereby selectively activating / deactivating the friction elements. And an automatic transmission shifted to the lubrication side. The automatic transmission shifts from the torque converter side to the oil cooler, and is installed on the branch pipe. The automatic transmission shifts the amount of oil flowing into the oil cooler A hydraulic control device for a hydraulic fluid for an automatic transmission is provided.

Description

Hydraulic flow control device for automatic transmission

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic fluid control apparatus for an automatic transmission, and more particularly, to a hydraulic fluid control apparatus for an automatic transmission that increases a cooling efficiency by controlling a hydraulic pressure discharged to a oil cooler after being introduced into a torque converter of an automatic transmission, To a hydraulic flow control device for an automatic transmission.

Generally, an automobile is divided into a chassis constituted by an appearance body and a body including the power generation device, the power transmission device, the steering device, the suspension device, and the braking device. Particularly, the power transmission device of the above-described chassis is disposed between the engine and the propelling shaft so that the driving force of the engine is appropriately changed according to the traveling speed of the vehicle and transmitted to the driving wheel side. These transmissions are categorized into a manual transmission that changes the driving force of the engine by operating according to the driver's intention, and an automatic transmission that automatically changes the driving force of the engine by determining the driving conditions and conditions by various sensors. The above-described automatic transmission is currently widely used due to its convenient operation as well as its relatively inefficient operation.

The automatic transmission includes a torque converter and a multistage transmission mechanism connected to the torque converter and includes a hydraulic operation friction element for selecting one of the gear stages of the transmission mechanism according to the running state of the vehicle . The hydraulic control system of such an automatic transmission for an automobile has a function of automatically selecting an appropriate shift according to the running state of the vehicle by selecting a friction element through a control valve and operating the hydraulic pressure generated from the oil pump. The hydraulic pressure control system includes pressure control means for controlling the hydraulic pressure generated from the oil pump, manual and automatic transmission control means for forming a transmission mode, and transmission speed and response control means A hydraulic control means, a damper clutch control means for a damper clutch operation of the torque converter, and a hydraulic pressure distributing means for distributing an appropriate hydraulic pressure supply to each friction element. The automotive automatic transmission generally used includes a pump impeller connected to the output shaft of the engine and driven together, a turbine runner connected to the input shaft of the transmission and operating together, and a stator disposed between the impeller and the turbine runner It has a fluid torque converter.

With this arrangement, the fluid is circulated by the pump impeller driven by the engine with the auxiliary action of the stator that allows the fluid to flow in the direction that does not interfere with the rotation of the pump impeller when the fluid enters the impeller from the turbine runner. The automatic transmission is made by changing the transmission ratio in the planetary gear unit by the operation of a friction element such as a clutch or kick-down brake for each gear position. In addition, the friction element is selectively operated by changing the direction of flow of the hydraulic pressure by a plurality of valves of the hydraulic control apparatus. The manual valve performs port conversion at the selected position of the shift lever of the driver, And is connected to a conduit through which the fluid pressure can be supplied to the shift control valve. On the other hand, the hydraulic pressure drawn into the torque converter side is drawn into the oil cooler side at the time of discharging to cool the oil, and the cooled oil is lubricated by flowing into the lubricating part such as a transaxle.

In the conventional automatic transmission, when the hydraulic pressure is discharged to the cooler side, the automatic transmission enters the cooler regardless of the oil temperature. However, in such a case, when the temperature of the oil is low, an excessive flow occurs to the cooler side to increase the viscosity. Accordingly, the amount of oil supplied to each lubricating portion is reduced to cause air inflow or the like, So that the operating performance of the transmission is reduced. Further, when the temperature of the oil is high, the amount of oil to be drawn into the cooler is lower than that required for the cooler, resulting in low heat generation performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to reduce the amount of oil flowing to the oil cooler side at a low temperature and to flow a large amount at a high temperature to reduce troubles such as air inflow at a low temperature, And to provide a hydraulic flow control device for an automatic transmission that improves the operating performance of the transmission by increasing the cooling efficiency.

In order to achieve the object of the present invention, there is provided an oil pump comprising: an oil pump for generating a hydraulic pressure by a drive gear rotating together with an engine; The oil pressure discharged from the oil pump is drawn into a plurality of control valves through a conduit, and the oil pressure is supplied to a plurality of friction elements, thereby selectively activating / deactivating the friction elements. And an automatic transmission shifted to the lubrication side. The automatic transmission shifts from the torque converter side to the oil cooler, and is installed on the branch pipe. The automatic transmission shifts the amount of oil flowing into the oil cooler A hydraulic control device for a hydraulic fluid for an automatic transmission is provided.

The hydraulic fluid control device for an automatic transmission controls the amount of oil introduced into the oil cooler side in accordance with the temperature.

FIG. 1 is a hydraulic circuit diagram for explaining an application state of an embodiment according to the present invention. FIG.

FIG. 2 is a schematic view showing a structure of a main part according to a first embodiment of the present invention; FIG.

FIG. 3 is a perspective view showing in detail the main part of FIG. 2; FIG.

FIG. 4 is a configuration diagram showing a main part of a second embodiment according to the present invention. FIG.

FIG. 5 is a side view showing the main part of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a hydraulic circuit diagram for explaining an embodiment according to the present invention. The torque converter 2 is disposed between the crankshaft of the engine and the transmission and transmits power. An oil pump 4 installed in the pump drive hub of the torque converter 2 and having a drive gear that rotates together and a driven gear that is gear-engaged with the drive gear; A pressure regulating valve 6 for converting the hydraulic pressure generated by the oil pump 4 into a constant pressure for controlling the friction element; And a damper clutch control valve 8 for selectively controlling the damper clutch in the torque converter 2 by the hydraulic pressure supplied through the pressure regulating valve 6 described above. The oil cooler 10 is connected to the duct by discharging the supplied oil pressure to return the oil pressure supplied from the oil pump through another damper clutch control valve 8 or to operate the damper clutch. A channel 12 connecting the damper clutch control valve 8 and the oil cooler 10 is branched and a new channel is formed by connecting the branched channel 14 with the channel 12 again . The branch conduit (14) is provided with a flow rate control means for varying the flow rate of the flow rate to the oil cooler (10) side depending on the temperature.

FIG. 2 is an enlarged view of part A of FIG. 1, showing the first embodiment. In the first embodiment described above, the channel 12 flowing to the oil cooler 10 side is branched so that a predetermined storage space 16 is formed on one side of the branched channel 14. 3, a flow controller 20 in which a plurality of through holes 18 are formed is interposed in the above-mentioned storage space 16. [ The flow controller 20 has a structure in which the oil from the side of the torque converter 2 can pass through the fine holes 18 and the flow resistance of the fluid is increased at a low temperature, And at the high temperature, it becomes smaller in the fluid flow resistance, and the passing flow rate is increased. The pipe connecting the damper clutch control valve 8 and the oil cooler 10 is preferably provided with an orifice pipe 22 so that the oil can flow into the branch pipe side.

When the temperature of the oil flowing to the oil cooler 10 side is low, the viscosity of the oil increases and the fluid flow resistance increases when passing through the fine holes of the flow controller 20 And the amount of oil introduced into the oil cooler 10 side is reduced. At the high temperature, the viscosity of the fluid becomes small, so that the flow resistance becomes small when passing through the fine holes of the flow controller 20, and the amount of oil flowing toward the oil cooler 10 is increased.

4 shows a second embodiment according to the present invention in which a branch pipe line 14 is installed in a pipeline 12 to which a damper clutch control valve 8 and an oil cooler 10 are connected, A bimetal 24 is provided inside the branch pipe 14 on the inner side of the branch pipe 14 for reducing or enlarging the flow path according to the temperature of the oil. As shown in FIG. 5, the above-described bimetallic structure is formed by adhering thin plate members made of a common dissimilar metallic material so as to overlap one another and fixing one end thereof to the valve body 26. It is preferable that the bimetal is fixed by caulking, but the operation and effects of the present invention are the same even if they are combined by various methods such as screwing.

In the hydraulic fluid control device for an automatic transmission as described above, when the high-temperature oil passes, the channel 14 is expanded by the bimetal, and when the low-temperature oil passes, the channel 14 is also reduced by the bimetal, 10 can be controlled.

In the hydraulic fluid control device for an automatic transmission according to the present invention, the amount of oil flowing from the torque converter to the oil cooler is controlled according to the temperature, so that an error that bubble formation occurs at a low temperature can be reduced. The operating performance of the automatic transmission can be improved.

Claims (3)

An oil pump for generating a hydraulic pressure by a drive gear rotating together with the engine; The oil pressure discharged from the oil pump is drawn into a plurality of control valves through a conduit, and the oil pressure is supplied to a plurality of friction elements, thereby selectively activating / deactivating the friction elements. And an automatic transmission shifted to the lubrication side. The automatic transmission shifts from the torque converter side to the oil cooler, and is installed on the branch pipe. The automatic transmission shifts the amount of oil flowing into the oil cooler And a flow control means for controlling the flow of the hydraulic fluid. The flow control device according to claim 1, wherein the flow rate control means comprises a flow controller which has a plurality of minute through-holes formed therein to allow the flow resistance of the fluid to be reduced at a low temperature to reduce the flow rate thereof, Hydraulic flow control device for transmission. [2] The apparatus according to claim 1, wherein the flow control means comprises a bimetal which is fixed to one side of the conduit in a state where metal materials of different materials are overlapped to reduce the conduit when the temperature of the oil is low, Hydraulic control device for automatic transmission.