JP2010270775A - Cooling type lubricating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a breather blow at the high rotation of a rotary member, in a cooling type circulating device applied to an automatic transmission. <P>SOLUTION: When the rotary member reaches a rotating speed A of causing the breather blow, and only when an allowance exists in the oil temperature when the oil temperature at its time is the preset temperature T or lower, the supply of lubricating oil is stopped by stopping the drive of an electric oil pump. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cooling lubrication apparatus applied to, for example, an automatic transmission.

  For example, Patent Document 1 discloses that a plate for shielding oil sprayed on a rotating member of an automatic transmission is provided to reduce breather blowing.

  Patent Document 2 discloses that in order to suppress breather blowing, the degree of oil agitation is estimated from the engine speed and the oil temperature, and the speed of the automatic transmission is controlled in accordance with the degree. ing.

JP 2004-68971 A JP 2008-75850 A

  By the way, in a cooling circulation device applied to an automatic transmission or the like, when the breather blowing frequency is increased, oil adheres to the surface of the case, which is disadvantageous because it looks like oil leakage.

  If an up-cooling structure in which oil is returned from above to improve cooling performance, there is a problem that the breather frequency is higher than that in the down-cooling structure. This is because the oil is returned from the top in addition to the stirring of the oil by the rotating member in the structure in which the oil is applied to the rotating member in the case by the reverse cooling type, so that the oil can easily go to the vicinity of the breather.

  The present invention has been made in view of such a technical background, and an object of the present invention is to provide a cooling-type circulation device that can reduce breather blowing during high rotation of a rotating member.

  In order to achieve the above-mentioned object, the inventors of the present invention are configured to use an electric oil pump to return oil into a case having a breather at the top, and to cool the rotating member in the case. The idea was that the electric oil pump should be stopped in a condition where breather blowing occurs in the oil lubrication device.

  The specific invention based on this idea is as follows.

  A cooling type lubricating device according to the present invention is a cooling type lubricating device configured to return oil into a case provided with a breather by an electric oil pump and to apply oil to a rotating member in the case. A rotational speed determination means for determining whether or not the rotating member has reached a rotational speed at which breather blowing occurs, an oil temperature determination means for determining whether or not the oil temperature is equal to or lower than a set temperature, and the rotational speed The drive of the electric oil pump is stopped on the condition that it is determined by the determining means that the rotating member has reached the rotational speed at which breather blow occurs and the oil temperature determining means determines that the oil temperature is equal to or lower than the set temperature. And control means for stopping the supply of the lubricating oil.

  According to the above configuration, the electric oil pump is driven only when the rotating member reaches the rotational speed at which breather blowing occurs and the oil temperature at that time is below the set temperature and the oil temperature is sufficient. The supply of lubricating oil is stopped. Therefore, breather blowing during high rotation of the rotating member can be reduced without causing a decrease in output torque due to a temperature increase of the rotating member.

  According to the present invention, it is possible to provide a cooling type circulation device that can reduce breather blowing during high rotation of the rotating member.

It is a figure which simplifies and shows the structure of the reverse cooling type | formula circulation apparatus concerning embodiment of this invention. It is a flowchart which shows the flow of control of a return cooling type | formula circulation apparatus same as the above.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Configuration>
FIG. 1 is a diagram showing a simplified configuration of a reverse cooling type circulation device 10 according to an embodiment of the present invention.

  Referring to FIG. 1, an upward cooling type circulation device 10 of the present embodiment is applied to an automatic transmission, and is an electric oil pump with an oil cooler (hereinafter simply referred to as “electric oil pump”). In FIG. 12, the oil is returned to the case 16 having the breather 14 at the top, and the rotating member 18 in the case 16 is oiled.

  The reverse cooling type circulation device 10 includes a rotation speed sensor 20 for determining whether or not the rotation member 18 has reached a rotation speed A at which breather blowing occurs, and whether or not the oil temperature is equal to or lower than a set temperature T. An oil temperature sensor 22 for determination is included, and detection signals of these sensors 20 and 22 are input to an electronic control unit (hereinafter referred to as “ECU”) 24.

  The rotation speed sensor 20 is provided in association with the rotation axis 26 of the rotation member 18. On the other hand, the oil temperature sensor 22 is provided near the bottom surface in the case 16.

  The ECU 24 includes a CPU, a ROM, a RAM, a backup RAM, and the like (not shown), and is connected to the electric oil pump 12 via an oil pump switch 28.

<Control flow>
FIG. 2 is a flowchart showing a flow of control of the reverse cooling type circulation device 10.

  Referring to FIG. 2, first, ECU 24 determines whether or not electric oil pump 12 is operating based on a switching signal from oil pump switch 28 (step S10). When the oil pump switch 28 is turned off and the electric oil pump 12 is not operating, the ECU 24 returns the control without performing any control. On the other hand, when the oil pump 12 is turned on and the electric oil pump 12 is operating, the ECU 24 advances the control to step S12.

  When the control proceeds to step S12, the ECU 24 determines whether or not the rotation member 18 has reached the rotation speed A at which the breather blow occurs based on the detection signal from the rotation speed sensor 20. If the rotational speed of the rotating member 18 has not reached the rotational speed A at which breather blowing occurs, the ECU 24 returns the control without performing any control. On the other hand, when the rotational speed of the rotating member 18 has reached the rotational speed A at which breather blowing occurs, the ECU 24 advances the control to step S14.

  When the control proceeds to step S14, the ECU 24 determines whether or not the oil temperature is equal to or lower than the set temperature T based on the detection signal from the oil temperature sensor 22. If the oil temperature exceeds the set temperature T and there is no room for the oil temperature, the control is returned without performing any control. On the other hand, when the oil temperature is equal to or lower than the set temperature T and the oil temperature has a margin, the ECU 24 turns off the oil pump switch 28 and stops driving the electric oil pump 12 (step S16). Thereafter, the ECU 24 returns the control.

  These series of controls are repeatedly executed until the engine is stopped.

<Action and effect>
According to the present embodiment, the following operations and effects are achieved.

  The drive of the electric oil pump 12 is stopped only when the rotating member 18 reaches the rotational speed A at which breather blowing occurs and the oil temperature at that time is equal to or lower than the set temperature T. Since the supply of the lubricating oil is stopped, the breather blowing during the high rotation of the rotating member 18 can be reduced without causing a decrease in the output torque due to the temperature increase of the rotating member 18.

  The present invention is not limited to the above embodiment.

  In the said embodiment, the example which integrated the oil cooler with the electric oil pump was described. However, the present invention is not limited to such a configuration. Even if the electric oil pump and the oil cooler are separated, the same operation and effect can be obtained. In this case, the oil cooler may be arranged on the upstream side of the electric oil pump, or may be arranged on the downstream side. The oil cooler may be eliminated.

  In addition, it goes without saying that various design changes and modifications can be made within the scope of the claims attached to this specification.

DESCRIPTION OF SYMBOLS 10 Upward cooling type circulator 12 Electric oil pump 14 Breather 16 Case 18 Rotating member 20 Rotational speed sensor 22 Oil temperature sensor 24 ECU

Claims (1)

A cooling lubrication device configured to return oil into a case equipped with a breather with an electric oil pump and to apply oil to a rotating member in the case,
A rotational speed determination means for determining whether or not the rotational member has reached a rotational speed at which breather blowing occurs;
Oil temperature determination means for determining whether the oil temperature is equal to or lower than a set temperature;
On condition that the rotational speed determining means determines that the rotating member has reached the rotational speed at which breather blowing occurs, and the oil temperature determining means determines that the oil temperature is equal to or lower than a preset temperature, the electric oil pump And a control means for stopping the drive and stopping the supply of the lubricating oil.

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