JP2922587B2 - Automatic transmission lubrication system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lubricating device for an automatic transmission that ensures lubrication performance when the vehicle is towed.

(Prior Art) Conventionally, the following devices are known as lubrication devices for automatic transmissions.

"TOYOTA A340E Service Manual" Japanese Utility Model Application Laid-Open No. 57-109361 Japanese Utility Model Application Publication No. 57-110359 (Problems to be Solved by the Invention) However, the above-described conventional techniques have the following problems.

In the prior art (1), when the vehicle is towed at high speed with the engine stopped and the oil pump not operating, no oil is supplied to the planetary gears directly connected to the transmission shaft, so that seizure occurs. Occur.

In the prior art (2), the oil chamber must be set above the center line of the transmission, which is disadvantageous in terms of layout and space.

In the prior art (3), the running load increases due to agitation resistance caused by an oil splasher found in a transmission gear or a general-purpose engine, resulting in a loss horsepower.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and is advantageous in terms of space and cost in a lubricating apparatus for an automatic transmission. An object is to ensure high lubrication performance during running.

(Means for Solving the Problems) In order to solve the above problems, in the lubricating device of the present invention, each of the discharge oil hole and the suction oil hole on the transmission shaft that rotates with the rotation of the wheels during towing travel. A negative pressure difference is generated at the position of the outer opening end by a peripheral speed difference, and the negative pressure is used to suck up oil from an oil pan and supply the oil to a portion requiring lubrication from a discharge oil hole.

That is, an oil pump that is operated by an engine driving force and sucks oil from an oil pan, a main lubricating oil passage that supplies oil from the oil pump to a predetermined position on a transmission shaft via a control valve unit, and a main lubricating oil passage. , A suction oil hole radially provided in the transmission shaft, a communication with the suction oil hole, a shaft oil passage provided in the center axis direction of the transmission shaft, and a communication with the shaft oil passage. And a lubricating device for an automatic transmission having a transmission oil hole radially provided on a transmission shaft at a position corresponding to a portion requiring lubrication, wherein when the transmission shaft is rotated by a wheel, the lubrication device is positioned outside the discharge oil hole. The configuration is such that a shaft peripheral speed at an open end position is higher than a shaft peripheral speed at an outer open end position of the suction oil hole, and a sub-lubricating oil that supplies oil from an oil pan to the main lubricating oil passage. Connect the road The said sub-lubricating oil passage has a means which is characterized in that a one-way valve permitting only flow of oil to the main lubricating oil passage.

(Operation) When the engine is driven, the oil pump that sucks oil from the oil pan operates, and pressurized oil from the oil pump is supplied to a predetermined position on the transmission shaft through the control valve unit through the main lubricating oil passage. The main lubricating oil passage is fed into a suction oil hole provided in the radial direction of the transmission shaft, and is further provided in the radial direction of the transmission shaft through a shaft oil passage provided in the transmission output central axis direction. The lubrication performance during normal running is ensured by supplying the lubrication required from the discharged oil hole. At this time, since the one-way valve is closed by the oil flowing to the sub-lubricating oil passage side, there is no oil outflow to the sub-lubricating oil passage.

During towing travel, the oil pump does not operate because the engine is stopped, but the transmission shaft rotates with the rotation of the wheels as the vehicle is being towed.

At this time, a negative pressure is generated at the outer open end position of the suction oil hole and the outer open end position of the discharge oil hole provided in the transmission shaft.
Since the shaft peripheral speed at the outer opening end position of the discharge oil hole is set higher than the shaft peripheral speed at the outer opening end position of the suction oil hole, the negative pressure at the outer opening end position of the discharge oil hole reduces the suction oil. A pump action that exceeds the negative pressure at the outer open end position of the hole and sucks up oil by the negative pressure difference.

Therefore, the oil in the oil pan is sucked up by opening the one-way valve through the sub-lubricating oil passage, passing through the shaft oil passage from the suction oil hole, and being supplied to the portion requiring lubrication from the discharge oil hole, thereby providing lubrication performance during towing travel. Is secured. In addition, the higher the speed of the transmission shaft, the greater the difference in the peripheral speed between the outer opening end position of the discharge oil hole and the outer opening end position of the suction oil hole, and the greater the negative pressure difference. The amount of oil supplied from the holes to the parts that require lubrication increases as the speed of the towed vehicle increases, and effectively prevents seizure of gears and bearings even during high-speed towed operations. Shows a lubricating action.

First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

 First, the configuration will be described.

FIG. 1 is an overall view showing the structure of a lubricating device for an automatic transmission according to a first embodiment of the present invention.

The lubricating device for an automatic transmission according to the first embodiment is operated by a driving force of an engine 1 to pump oil from an oil pan 2, an oil from the oil pump 3, a pump discharge oil passage 4, and a control valve unit. 5, a main lubricating oil passage 7 that supplies a predetermined position of the transmission output shaft 6 via a transmission oil passage 5, a suction oil hole 8 that communicates with the main lubricating oil passage 7, and is provided in the transmission output shaft 6 in a radial direction. A shaft oil passage 9 communicating with the suction oil hole 8 and provided in the center axis direction of the transmission output shaft 6; and a shaft oil passage 9 communicating with the shaft oil passage 9 and having two positions corresponding to portions requiring lubrication. The transmission output shaft 6 includes discharge oil holes 10 and 11 provided in a radial direction.

The communication between the main lubricating oil passage 7 and the suction oil hole 8 is as follows:
An outlet port of the main lubricating oil passage 7 is provided in a space 15 formed between the two oil seals 13 and 14 provided in the bearing member 12.
This is achieved by opening the inlet port 7a of the suction oil hole 8 and the inlet port 7a.

In the control valve unit 5, the excess circulation amount of the operating oil of the converter pressure sent to the torque converter is cooled via the oil cooler and supplied to the main lubricating oil passage 7 as lubricating oil.

Among the oil holes provided in the transmission output shaft 6, a small shaft diameter
D _S partial suction oil hole 8 is formed in the are discharge oil holes 10 and 11 formed in a portion of the Daijiku径D _L, when the transmission output shaft 6 is rotated by the wheel, the discharge oil holes 10, 11 The output shaft peripheral speed at the outlet ports 10a and 11a is higher than the output shaft peripheral speed at the inlet port 8a of the suction oil hole 8.

The main lubricating oil passage 7 is connected to a sub-lubricating oil passage 16 for supplying oil from the oil pan 2.
Flow from the oil pan 2 to the main lubricating oil passage 7
A one-way valve 17 is provided that allows only flow to

 Next, the operation will be described.

(A) When the engine is driven When the engine 1 is driven, the oil pump 3 for sucking oil from the oil pan 2 is operated, and pressurized oil from the oil pump 3 is sent to the control valve unit 5 via the pump discharge oil passage 4. It is supplied from the control valve unit 5 to the position of the suction oil hole 8 of the transmission output shaft 6 via the main lubricating oil passage 7.

Then, the oil fed into the suction oil hole 8 provided in the radial direction of the transmission output shaft 6 further passes through the shaft oil passage 9 provided in the transmission output center axis direction, and the transmission output shaft 6.
The lubricating oil is supplied to the portions requiring lubrication from the discharge oil holes 10 and 11 provided in the radial direction, and the lubrication performance during normal running is ensured.

At this time, since the one-way valve 17 is closed by the oil flowing from the main lubricating oil passage 7 to the sub-lubricating oil passage 16, there is no oil outflow through the sub-lubricating oil passage 16.

(B) When the vehicle is being towed While the vehicle is being towed, the oil pump 3 does not operate because the engine 1 is stopped. However, since the vehicle is being towed, the transmission output shaft 6 is rotated with the rotation of the wheels. Rotates.

At this time, a negative pressure is generated between the position of the suction oil hole 8 provided on the transmission output shaft 6 and the position of the discharge oil holes 10 and 11, but the output shaft peripheral speed at the position of the discharge oil holes 10 and 11 is reduced. Since the output shaft peripheral speed at the position of the suction oil hole 8 is larger than the negative pressure at the position of the discharge oil hole 8, the negative pressure at the position of the discharge oil hole 10 is higher than the negative pressure at the position of the suction oil hole 8. Pump action.

Accordingly, the oil in the oil pan 2 is sucked up by opening the one-way valve 17 through the sub-lubricating oil passage 16, passing through the suction oil hole 8, passing through the shaft oil passage 9, and being supplied from the discharge oil holes 10, 11 to portions requiring lubrication. As a result, lubrication performance during towing is ensured.

In addition, the higher the speed of the transmission output shaft 6, the greater the difference between the peripheral speeds of the output shaft at the positions of the discharge oil holes 10 and 11 and the position of the suction oil hole 8 and the negative pressure difference. The amount of oil supplied from the discharge oil holes 10 and 11 to the parts requiring lubrication increases as the speed of the towed vehicle increases, and even when the vehicle is towed at high speed, the gears and bearings can be effectively used. It shows a lubricating action to prevent seizures such as.

As explained above. In the lubricating device for an automatic transmission according to the first embodiment, the lubricating device is formed around the discharge oil holes 10 and 11 and the suction oil hole 8 on the transmission output shaft 6 which rotates with the rotation of the wheels during towing travel. A negative pressure difference is generated due to the speed difference, and using this negative pressure, the oil in the oil pan 2 is sucked up and the discharge oil hole 1 is discharged.
Since the oil is supplied from 0, 11 to the parts requiring lubrication, the sub-lubricating oil passage 16 and the one-way valve 17 can be added to the existing lubricating device. However, without impairing the lubrication performance during normal driving,
High lubrication performance can be ensured during towing travel.

Second Embodiment Next, a second embodiment will be described.

FIG. 2 is a view showing a lubricating device for an automatic transmission according to a second embodiment. In the first embodiment, an output port 10a of discharge oil holes 10, 11 provided on a single transmission output shaft 6 is shown. , 11a and the outlet port 8a of the suction oil hole 8 have a difference in peripheral speed by setting a diameter difference. In the second embodiment, the transmission shaft is connected to the input shaft 18, the intermediate shaft 19, The output shaft 20 is composed of three shafts, and the difference between the shaft diameters is also set slightly, but the outlet ports 21a, 22a of the discharge oil holes 21, 22, 23, 24 mainly depend on the rotational speed difference of each shaft. , 2
This is an example in which there is a peripheral speed difference between 3a, 24a and the inlet port 8a of the suction oil hole 8.

In FIG. 2, reference numerals 9a, 9b, and 9c denote shaft oil passages formed in the input shaft 18, the intermediate shaft 19, and the output shaft 20, respectively.

Since the other configuration is the same as that of the first embodiment, the corresponding components are denoted by the same reference numerals and description thereof is omitted.

Operationally, during towing travel, the rotation speed N of the input shaft 18 connected to the turbine runner of the torque converter
And _I, the rotational speed N _M of the intermediate shaft 19 to planetary gears are provided, between the rotational speed N _O of the output shaft 20 coupled to the wheels, the relationship of N _I <N _M <N _O There is a difference in peripheral speed between the outlet ports 21a, 22a, 23a, 24a of the discharge oil holes 21, 22, 23, 24 and the inlet port 8a of the suction oil hole 8, thereby ensuring lubrication during towing travel. Is done.

That is, the second embodiment has the same operation and effect as the first embodiment.

As described above, the embodiments have been described based on the drawings. However, the specific configuration is not limited to the embodiments, and even if there is a design change without departing from the gist of the present invention, it is included in the present invention. .

(Effects of the Invention) As described above, according to the present invention, in a lubricating device for an automatic transmission, a discharge oil hole and a suction oil on a transmission shaft that rotates with rotation of a wheel during towing travel. Since a negative pressure difference is generated at each outer opening end position of the hole due to a peripheral speed difference, the negative pressure is used to suck up oil in an oil pan and supply oil from a discharge oil hole to a portion requiring lubrication, This is advantageous in terms of space and cost, and has an effect that high lubrication performance can be secured during towing travel without impairing the lubrication performance during normal traveling.

[Brief description of the drawings]

FIG. 1 is an overall view showing a configuration of a lubricating device for an automatic transmission according to a first embodiment of the present invention, and FIG. 2 is an overall view showing a configuration of a lubricating device for an automatic transmission according to a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Engine 2 ... Oil pan 3 ... Oil pump 4 ... Pump discharge oil path 5 ... Control valve unit 6 ... Transmission output shaft 7 ... Main lubricating oil path 8 ... Suction oil hole 9 ... Shaft center oil passage 10, 11… Discharge oil hole 16… Sub-lubrication oil passage 17… One-way valve

Claims (1)

(57) [Claims] An oil pump that is operated by an engine driving force and sucks oil from an oil pan; a main lubricating oil passage that supplies oil from the oil pump to a predetermined position on a transmission shaft via a control valve unit; A suction oil hole communicating with the lubricating oil passage and provided in the transmission shaft in a radial direction, a shaft oil passage communicating with the suction oil hole and provided in a center axis direction of the transmission shaft, and the shaft oil; A lubricating device for an automatic transmission, the lubricating device being provided with a discharge oil hole radially provided in a transmission shaft at a position corresponding to a portion requiring lubrication, the discharge oil being provided when the transmission shaft is rotated by wheels. The shaft peripheral speed at the outer opening end position of the hole is set to be higher than the shaft peripheral speed at the outer opening end position of the suction oil hole, and oil from an oil pan is supplied to the main lubricating oil passage. Connect sub lubrication oil passage A lubricating device for an automatic transmission, wherein the sub-lubricating oil passage is provided with a one-way valve that allows only oil flow to the main lubricating oil passage.