JPH1163178A - Transmission lubrication system - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To ensure the viscosity of a working lubricating oil at a high temperature while ensuring the fluidity at a low temperature. At a high temperature, low-boiling low-viscosity oil in mixed working lubricating oil (7) in a transmission main chamber (1) evaporates to form a gas passage.
8 to gearbox subchamber 2 During the movement, the gaseous low-boiling low-viscosity oil is liquefied by the cooling pipe 3. At this time, the thermostat 6 is closed, and the low-boiling low-viscosity oil in the transmission sub-chamber 2 is transmitted through the liquid passage 5 to the transmission main chamber 1.
Can not move to Therefore, the working lubricating oil 7 in the transmission main chamber 1 has a high proportion of the high-boiling point high-viscosity oil, and the viscosity is appropriately secured. At low temperatures, the thermostat 6 opens. Therefore, the low-boiling-point low-viscosity oil in the transmission sub-chamber 2 moves to the transmission main chamber 1 via the liquid passage 5. Therefore, as for the working lubricating oil 7 in the transmission main chamber 1, the ratio of the low-boiling point, low-viscosity oil is increased, and the fluidity is appropriately secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lubricating device for a transmission.

[0002]

2. Description of the Related Art When transmitting power, a manual transmission, an automatic transmission, a continuously variable transmission, and the like are used to control the number of revolutions, torque, and the like. These transmissions use hydraulic and lubricating oil for operation and lubrication, for torque transmission, lubrication, hydraulic operation control, and the like. Among these transmissions, the traction drive type continuously variable transmission has little friction loss, and basically has advantages such as high efficiency, low noise, and high speed operation. Further, since the gear ratio of the transmission can be continuously controlled, the characteristics of the engine can be sufficiently utilized, and the exhaust gas and fuel efficiency can be improved. An example of this type of traction drive type continuously variable transmission is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-1932.
There is one described in Japanese Patent Publication No.

[0003]

The traction drive type continuously variable transmission described above has an operation and lubrication oil having higher traction characteristics than the operation and lubrication oil used in a manual transmission and an automatic transmission. Is used. Operating and lubricating oils with high traction properties tend to have too high a viscosity and too low a fluidity at low temperatures. As a result, the startability and hydraulic operability of the transmission at low temperature, that is, the operation and lubricating oil at low temperature, are reduced. In order to solve this problem, when using a low-viscosity operating and lubricating oil, conversely, when the operating and lubricating oil is at a high temperature, the viscosity is excessively low,
The fluidity becomes excessively high. As a result, poor lubrication such as seizure of the transmission and abrasion based on the lubrication oil film breakage,
In addition, there is a possibility that oil leakage occurs in the seal portion of the transmission.

[0004] In view of the above problems, the present invention prevents the deterioration of the startability and hydraulic operability of the transmission by securing the fluidity of the oil used for the operation or lubrication of the transmission at low temperatures. It is another object of the present invention to provide a lubricating device for a transmission that can prevent poor lubrication and oil leakage of the transmission by securing viscosity at high temperatures.

[0005]

According to the first aspect of the present invention, there is provided an operating lubricating oil including a low-boiling low-viscosity oil and a high-boiling high-viscosity oil for at least operating or lubricating a transmission. In a lubricating device for a transmission, a working lubricating oil chamber in which the working lubricating oil supplied to the transmission is stored, and a low boiling point, low viscosity evaporating due to a rise in the temperature of the working lubricating oil accompanying a rise in the temperature of the transmission. A low-boiling low-viscosity oil chamber for collecting and storing oil, and a return passage for returning the low-boiling low-viscosity oil stored in the low-boiling low-viscosity oil chamber to the working lubricating oil chamber in a liquefied state. A lubricating device for a transmission, wherein the lubricating device further comprises a control unit that controls a flow rate of the low-boiling-point low-viscosity oil returned into the working lubricating oil chamber based on a temperature of the working lubricating oil.

In the lubricating device for a transmission according to the first aspect,
When the operating lubricating oil is at a high temperature, the low-boiling low-viscosity oil evaporated from the operating lubricating oil in the operating lubricating oil chamber is collected and stored in the low-boiling low-viscosity oil chamber. At this time, the flow rate of the low-boiling low-viscosity oil that is returned in a liquefied state into the working lubricating oil chamber is controlled to zero or a small amount. Is getting higher. As a result, the transmission is operated and lubricated by the operating lubricating oil having a high proportion of high-boiling high-viscosity oil, which has an appropriate viscosity even when the operating lubricating oil is at a high temperature, resulting in poor lubrication of the transmission and oil leakage. Can be prevented. On the other hand, when the operating lubricating oil is at a low temperature, the low-boiling low-viscosity oil does not evaporate much from the operating lubricating oil in the operating lubricating oil chamber. At this time, the flow rate of the low-boiling low-viscosity oil returned in a liquefied state into the working lubricating oil chamber is controlled so that the proportion of the low-boiling low-viscosity oil in the working lubricating oil is increased. As a result, the transmission is operated and lubricated by the operating lubricant having a high ratio of the low-boiling point and low-viscosity oil, which has appropriately secured fluidity even at a low temperature of the operating lubricating oil. A decrease in operability can be prevented.

According to a second aspect of the present invention, there is provided a lubricating device for a transmission including an operating lubricating oil including a low-boiling low-viscosity oil and a high-boiling high-viscosity oil for at least operating or lubricating the transmission. Collecting and storing a working lubricating oil chamber in which the working lubricating oil supplied to the transmission is stored, and a low-boiling low-viscosity oil evaporated due to a rise in the temperature of the working lubricating oil accompanying a rise in the temperature of the transmission. A low-boiling low-viscosity oil chamber, and a return passage for returning the low-boiling low-viscosity oil stored in the low-boiling low-viscosity oil chamber to the working lubricating oil chamber in a liquefied state. A lubricating device for a transmission, wherein a flow rate of a low-boiling low-viscosity oil returned into a working lubricating oil chamber is controlled based on the viscosity of the working lubricating oil.

In the lubricating device for a transmission according to claim 2,
When the viscosity of the working lubricating oil decreases, for example, when the temperature of the working lubricating oil rises or deteriorates, the flow rate of the low-boiling low-viscosity oil returned in a liquefied state in the working lubricating oil chamber becomes zero or a small amount. Controlled. Therefore, the working lubricating oil in the working lubricating oil chamber has a high proportion of high-boiling high-viscosity oil, and the viscosity does not decrease so much. As a result, the transmission is operationally lubricated with the operation lubricating oil having an appropriate viscosity and a high proportion of high-boiling point high-viscosity oil, and poor lubrication and oil leakage of the transmission can be prevented. On the other hand, for example, when the temperature of the working lubricating oil decreases or when the viscosity of the working lubricating oil increases, such as when the working lubricating oil is new, the low-boiling point low-viscosity oil returned in a liquefied state into the working lubricating oil chamber. The flow rate is controlled so that the proportion of the low-boiling low-viscosity oil in the working lubricating oil is high. as a result,
The transmission is operationally lubricated with an operation lubricant having a high flow rate of low boiling point and low viscosity oil, which has appropriately secured fluidity, and can prevent a decrease in startability and hydraulic operability of the transmission.
That is, the lubricating device for a transmission according to claim 2 operates regardless of the temperature of the working lubricant, that is, even when the working lubricant is deteriorated or the viscosity of the working lubricant varies. Claim 1 in that the viscosity of the lubricating oil can be appropriately adjusted.
Is more effective than the transmission lubrication device described in (1).

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram of a transmission lubrication device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a transmission main chamber in which a transmission (not shown) is disposed, 2 denotes a transmission sub-chamber, 3 denotes a cooling pipe, 4 denotes a radiator, 5 denotes a liquid passage, 6 denotes a thermostat, and 7 denotes a shift. An operating lubricating oil obtained by mixing a low-boiling low-viscosity oil and a high-boiling high-viscosity oil for at least operating or lubricating the machine, 8 denotes a gas passage, and 9 denotes a low-boiling low-viscosity oil. It is preferable to arrange a continuously variable transmission in the transmission main chamber 1, but it is also possible to arrange a manual transmission, an automatic transmission, and the like.

As shown in FIG. 1, in the transmission main chamber 1,
An operating lubricating oil 7 in which a low-boiling low-viscosity oil and a high-boiling high-viscosity oil are mixed is stored. In the transmission main chamber 1, the working lubricating oil lubricates a transmission (not shown) and, if necessary, controls the hydraulic operation of the transmission. After starting the transmission,
When the temperature of the mixed working lubricating oil 7 rises due to the heat generated by the stirring of the mixed working lubricating oil 7, the sliding of the transmission, and the like, the low-boiling low-viscosity oil in the mixed working lubricating oil 7 evaporates. The gaseous low-boiling low-viscosity oil moves in the direction of arrow A via the gas passage 8. Subsequently, the gaseous low-boiling low-viscosity oil is supplied to the cooling pipe 3
Is liquefied. The cooling pipe 3 is cooled by cooling water of the radiator 4. Liquefied low-boiling low-viscosity oil 9
Moves into the transmission sub-chamber 2 and is accommodated therein. When the temperature of the mixed working lubricating oil 7 in the transmission main chamber 1 is high, the thermostat 6 is expanded and closes the liquid passage 5 between the transmission main chamber 1 and the transmission sub-chamber 2. . Therefore, the low-boiling low-viscosity oil in the transmission sub-chamber 2 cannot move in the arrow B direction through the liquid passage 5 into the transmission main chamber 1. Therefore, the mixed working lubricating oil 7 in the transmission main chamber 1
The proportion of high boiling high viscosity oils is high. As a result, the transmission is operated and lubricated by the mixed operating lubricating oil 7 having a high ratio of high-boiling high-viscosity oil, which has an appropriate viscosity even at a high temperature, and prevents poor lubrication of the transmission and oil leakage. can do.

On the other hand, when the temperature of the mixed working lubricating oil 7 decreases, for example, after the transmission stops, the thermostat 6 contracts, and the liquid passage 5 between the transmission main chamber 1 and the transmission sub-chamber 2 is closed. Open. Therefore, the low-boiling low-viscosity oil in the transmission sub-chamber 2 moves through the liquid passage 5 into the transmission main chamber 1 in the direction of arrow B. Therefore, the ratio of the low-boiling-point low-viscosity oil in the mixed working lubricating oil 7 in the transmission main chamber 1 increases. as a result,
The transmission is operated and lubricated by a mixed operating lubricating oil 7 having a high ratio of low boiling point and low viscosity oil, which has a proper fluidity even at a low temperature, and reduces the startability and hydraulic operability of the transmission. Can be prevented.

As described above, both when the temperature of the working lubricating oil 7 in the transmission main chamber 1 is low and when it is high,
The transmission is properly operated and lubricated. As a result, the life of each component of the transmission is extended, and at the same time, the life of the working lubricant is also extended.

Further, when the temperature of the mixed working lubricating oil 7 rises as the temperature of the transmission increases, the low-boiling low-viscosity oil is vaporized.
Heat is taken away. As a result, the temperature rise of the transmission and the mixed working lubricating oil 7 can be suppressed.

FIG. 2 is a configuration diagram of a transmission lubrication device according to a second embodiment of the present invention. 2, the same reference numerals as those in FIG. 1 indicate the same parts as those in FIG.
Denotes a cooling device, 21 denotes a viscometer, 22 denotes an electromagnetic valve, 23 denotes an electromagnetic valve driving unit, and 24 denotes an ECU. As shown in FIG. 2, the transmission main chamber 1 contains a working lubricating oil 7 in which a high-boiling high-viscosity oil as a main component is mixed with a low-boiling low-viscosity oil. Contains a low boiling low viscosity oil. In the transmission main chamber 1, the working lubricating oil lubricates a transmission (not shown) and, if necessary, controls the hydraulic operation of the transmission.

For example, when the mixed working lubricant 7 is new,
The viscosity of the mixed working lubricating oil 7 is higher than when the mixed working lubricating oil 7 is old. Further, for example, when the transmission is started, the temperature of the mixed working oil 7 is low because the temperature of the transmission is low,
The viscosity of the mixed working lubricating oil 7 is high. The viscometer 21 detects the viscosity of the mixed working lubricating oil 7 and transmits this information to the ECU 2.
4 The ECU 24 determines that the viscosity of the mixed working lubricating oil 7 is high based on this information, and transmits a valve opening signal to the solenoid valve driving unit 23. The solenoid valve driving unit 23 is
, The low-boiling low-viscosity oil in the transmission sub-chamber 2 moves in the arrow B direction through the liquid passage 5 into the transmission main chamber 1. Therefore, in the mixed working lubricating oil 7 in the transmission main chamber 1, the ratio of the low-boiling low-viscosity oil increases, and the viscosity decreases. As a result, even when the viscosity of the mixed working lubricating oil 7 is high, the transmission can appropriately maintain fluidity by increasing the ratio of the low boiling point low viscosity oil in the mixed working lubricating oil 7. The operation is lubricated by the mixed operation lubricating oil 7, so that the startability and hydraulic operability of the transmission can be prevented from lowering.

On the other hand, for example, when the mixed working lubricating oil 7 is old, the viscosity of the mixed working lubricating oil 7 is lower than when the mixed working lubricating oil 7 is new. Also, for example, after starting the transmission,
The temperature of the mixed working lubricating oil 7 rises due to heat generated by the stirring of the mixed working lubricating oil 7, sliding of the transmission, and the like, and the viscosity of the mixed working lubricating oil 7 in the transmission main chamber 1 decreases. The low-boiling low-viscosity oil evaporated from the mixed working lubricating oil 7 as the temperature of the mixed working lubricating oil 7 rises is increased by an arrow A through the gas passage 8.
, And then liquefied in the cooling pipe 3 cooled by the cooling device 14, moved to the inside of the transmission sub-chamber 2, and housed therein. The viscometer 21 detects the viscosity of the mixed working lubricating oil 7 and transmits this information to the ECU 24. The ECU 24 determines that the viscosity of the mixed working lubricating oil 7 is low based on this information, and sends a valve closing signal to the solenoid valve driving unit 23.
To communicate. When the solenoid valve drive unit 23 closes the solenoid valve 22, the low-boiling low-viscosity oil in the transmission sub-chamber 2 cannot move through the liquid passage 5 into the transmission main chamber 1 in the arrow B direction. Therefore, the ratio of the high-boiling point high-viscosity oil in the mixed working lubricating oil 7 in the transmission main chamber 1 increases. as a result,
The transmission is operated and lubricated by the mixed working lubricating oil 7 whose viscosity is appropriately secured by increasing the proportion of the high boiling point high viscosity oil even when the viscosity of the mixed working lubricating oil 7 is low. Poor lubrication and oil leakage can be prevented.

Although the transmission is arranged in the transmission main chamber 1 in the above-described embodiment, the transmission lubrication oil is supplied from the transmission main chamber to the transmission for the operation lubrication, and the transmission is operated. It may be located anywhere as long as the working lubricant can be returned from the transmission to the transmission main chamber after lubrication. In the above embodiment, the operating lubricating oil performs the operation and lubrication of the transmission. However, the operating lubricating oil may perform only one of the operation and lubrication. Further, the working lubricating oil is cooled during the movement from the transmission main chamber 1 to the transmission sub-chamber 2 in the above-described embodiment, but may be cooled before returning to the transmission main chamber. It can be cooled anywhere.
In addition, the working lubricating oil is a mixture of a low-boiling low-viscosity oil and a high-boiling high-viscosity oil in the above-described embodiment, provided that it contains a low-boiling low-viscosity component and a high-boiling high viscosity. The mixing step may not be performed.

In the above-described embodiment, the thermostat and the solenoid valve open and close the fluid passage 5. However, by controlling the return flow rate of the low-boiling low-viscosity oil from the transmission sub-chamber to the transmission main chamber. As long as the viscosity of the working lubricating oil in the transmission main chamber can be adjusted, it may not be possible to completely close it. Further, in the first embodiment, the control of the return flow rate of the low-boiling low-viscosity oil based on the temperature of the working lubricating oil in the transmission main chamber is performed by the thermostat 6, but in other embodiments, the return flow is detected by a thermometer. The return flow rate of the low-boiling low-viscosity oil may be controlled by a known valve such as an electromagnetic valve, based on the temperature of the working lubricating oil in the transmission main chamber.
Further, in the above-described embodiment, the return flow rate is controlled based on the temperature or viscosity of the working lubricant, but in other embodiments, the return flow rate is controlled based on both the temperature and the viscosity of the working lubricant. May be.

[0020]

According to the first aspect of the present invention, the start-up and hydraulic operability of the transmission are prevented from deteriorating by ensuring the fluidity of the working lubricating oil at low temperatures, and the operation at high temperatures is prevented. By ensuring the viscosity of the lubricating oil, poor lubrication of the transmission and oil leakage can be prevented.

According to the second aspect of the invention, irrespective of the temperature of the working lubricating oil, that is, even when the working lubricating oil is deteriorated or when the viscosity of the working lubricating oil varies.
It is possible to prevent poor lubrication and oil leakage of the transmission, while preventing the startability and hydraulic operability of the transmission from lowering.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a transmission lubrication device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a transmission lubrication device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transmission main room 2 ... Transmission sub-room 3 ... Cooling pipe 5 ... Liquid passage 6 ... Thermostat 7 ... Mixed working lubrication oil 8 ... Gas passage 9 ... Low boiling point low viscosity oil

Claims (2)

[Claims] 1. A lubrication system for a transmission provided with an operating lubricating oil including a low-boiling low-viscosity oil and a high-boiling high-viscosity oil for at least operating or lubricating the transmission, wherein the operation supplied to the transmission is provided. An operating lubricating oil chamber in which lubricating oil is stored;
A low-boiling low-viscosity oil chamber that collects and stores the low-boiling low-viscosity oil evaporated by the temperature rise of the working lubricating oil accompanying the temperature rise of the transmission, and is stored in the low-boiling low-viscosity oil chamber. A return passage for returning the low-boiling low-viscosity oil in a state liquefied into the working lubricating oil chamber, and further comprising: a flow rate of the low-boiling low-viscosity oil returned into the working lubricating oil chamber; A lubricating device for a transmission, wherein the lubricating device is controlled based on: 2. A lubrication system for a transmission including an operating lubricating oil including a low-boiling low-viscosity oil and a high-boiling high-viscosity oil for at least operating or lubricating the transmission, wherein the operation supplied to the transmission is performed. An operating lubricating oil chamber in which lubricating oil is stored;
A low-boiling low-viscosity oil chamber that collects and stores the low-boiling low-viscosity oil evaporated by the temperature rise of the working lubricating oil accompanying the temperature rise of the transmission, and is stored in the low-boiling low-viscosity oil chamber. A return passage for returning the low-boiling low-viscosity oil in a state of being liquefied into the working lubricating oil chamber, further comprising: A lubricating device for a transmission, wherein the lubricating device is controlled based on: