JPH0439457A - Lubricating device for automatic transmission - Google Patents

Abstract

PURPOSE:To enhance lubricating performance at towed running time by utilizing a negative pressure difference due to a peripheral speed difference between delivery and suction oil holes on a transmission shaft rotated according to rotation of wheels, sucking up oil in an oil pan and supplying the oil to a lubrication necessary part from the delivery oil hole. CONSTITUTION:Since an engine 1 is stopped at tractive running time, an oil pump 3 is not operated, but a transmission shaft 6 is rotated according to rotation of wheels by towing a vehicle. Here, a negative pressure is generated in a suction oil hole 8 and delivery oil holes 10, 11 provided in the transmission shaft, but the negative pressure in the delivery oil hole exceeds the negative pressure in the suction oil hole to display pump action of sucking up oil by a differential negative pressure because shaft peripheral speed in the delivery oil hole is set larger than the shaft peripheral speed in a position of the suction oil hole. Accordingly, oil in an oil pan 2 is sucked up by opening a one-way valve 17 through a sublubricating oil path 16 and supplied to a lubrication necessary part from the suction oil hole, shaft center passage 9 and the delivery oil hole.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lubrication device for an automatic transmission that ensures lubrication performance when being towed by a vehicle.

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

■ ff TOYOTA A340E Service Manual'' ■ Publication of Utility Model Application No. 57-109361 ■ Publication of Utility Model Application No. 57-110359 (Invention or problem to be solved) However, the above-mentioned conventional techniques each have the problems listed below. have

In the conventional technology (1) (■), when a vehicle is towed at high speed with the engine stopped and the oil pump not operating, oil is not supplied to the planetary gears directly connected to the transmission shaft, resulting in seizure. or occur.

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

In the conventional technology (3) (2), the running load increases due to the agitation resistance caused by transmission gears and oil splashers found in general-purpose engines, resulting in loss of horsepower.

The present invention has been made with attention to the above-mentioned problems, and is a lubrication system for automatic transmissions that is advantageous in terms of space and cost, and that can be used to lubricate a towed vehicle without impairing the lubrication performance during normal driving. The challenge is to ensure high lubrication performance during driving.

(Means for Solving the Problems) In order to solve the above problems, in the lubricating device of the present invention, a discharge oil hole and a suction hole on the transmission shaft that rotate with the rotation of the wheels during towed driving are provided. A negative pressure difference is generated due to the speed difference, and this negative pressure is used to suck up oil from the oil pan and supply the oil from the discharge oil hole to the parts that require lubrication.

That is, an oil pump that is operated by engine driving force to suck up oil from an oil pan, a main lubricating oil passage that supplies oil from the oil pump to a predetermined position on the transmission shaft via a control valve, and the main lubricating oil. a suction hole that communicates with the transmission shaft and is provided in the radial direction of the transmission shaft; an axial oil passage that communicates with the suction hole and is provided in the direction of the central axis of the transmission shaft; In a lubrication system for an automatic transmission that includes a discharge oil hole that communicates with the transmission shaft and is provided in a radial direction on the transmission shaft at a position corresponding to a portion that requires lubrication, the position of the discharge oil hole when the transmission shaft is rotated by a wheel. The shaft circumferential speed at the suction oil hole position is made larger than the shaft circumferential speed at the suction oil hole position, and a sub-lubricating oil passage that supplies oil from the oil pan is connected to the main lubricating oil passage, and the sub-lubricating oil passage supplies oil from the oil pan. The lubricating oil passage is provided with a directional valve that allows oil to flow only into the main lubricating oil passage.

(Function) When the engine is running, the oil pump operates to suck up oil from the oil pan, and the pressurized oil from the oil pump is supplied to a predetermined position on the transmission shaft via the main lubricating oil path via the control pulp unit. The lubricating oil is fed from this main lubricating oil passage into the suction hole provided in the radial direction of the transmission shaft, and then passes through the shaft center oil passage provided in the direction of the transmission output center axis, and is fed into the suction hole provided in the radial direction of the transmission shaft. The oil is supplied to parts that require lubrication from the discharge oil hole, ensuring lubrication performance during normal driving.

At this time, the directional valve is closed by the oil flowing toward the sub-lubricating oil path, so no oil leaks into the sub-lubricating oil path.

When the vehicle is being towed, the oil pump does not operate because the engine is stopped, but since the vehicle is being towed,
As the wheels rotate, the transmission shaft rotates.

At this time, negative pressure is generated at the suction oil hole position and the discharge oil hole position provided on the transmission shaft, but the shaft circumferential speed at the discharge oil hole position is made larger than the shaft circumferential speed at the suction oil hole position. Because of this, the negative pressure at the discharge oil hole position exceeds the negative pressure at the suction oil hole position, indicating a pump action that sucks up oil due to the negative pressure difference.

Therefore, the oil in the oil pan is sucked up through the sub-lubricating oil passage by opening the one-way valve, passes through the suction hole through the axial oil passage, and is supplied from the discharge oil hole to the parts that require lubrication. Lubrication performance is ensured.

Moreover, the higher the speed changer shaft rotates, the larger the difference in shaft circumference between the discharge oil hole position and the suction oil hole position, and the larger the negative pressure difference, making it difficult for the discharge oil hole to supply lubrication to the parts that need it. The higher the towing speed, the greater the amount of oil, and even when the vehicle is being towed at high speed, it exhibits a lubricating effect that effectively prevents seizure of gears, bearings, etc.

(First example) Embodiments of the present invention will be described below based on the drawings.

First, I will explain the configuration.

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 automatic transmission lubrication system of the first embodiment includes an oil pump 3 that is operated by the driving force of an engine 1 to suck up oil from an oil pan 2, a pump discharge oil passage 4, and a control valve unit 5 for discharging the oil from the oil pump 3. A main lubricating oil path Y that supplies the transmission output shaft 6 to a predetermined position via
, a suction oil hole 8 that communicates with the main lubricating oil passage 7 and is provided in the radial direction of the transmission output shaft 6; A shaft center oil passage 9 is provided, and discharge oil holes 10 and 11 are provided in the transmission output shaft 6 in the radial direction at two positions communicating with the shaft center oil passage 9 and corresponding to parts requiring lubrication. We are prepared.

Communication between the main lubricating oil passage 7 and the suction oil hole 8 is achieved through two oil seals 43 and 14 provided on the bearing member 12.
This is achieved by opening the outlet port 7 of the main lubricating oil passage 7 and the inlet port 8a of the suction oil hole 8 into the space 15 formed between the two.

In the control valve unit 5, an excess circulating portion of converter-pressure hydraulic oil sent to the torque converter is cooled via an oil cooler and supplied to the main lubricating oil path 7 as lubricating oil.

Among the oil chambers provided in the transmission output shaft 6, the small shaft diameter D
A suction oil hole 8 is formed in the S part, and discharge oil holes 10 and 11 are formed in the large shaft diameter part, and when the transmission output shaft 6 is rotated by the wheel, the outlet of the discharge oil hole 10, 11 is formed. Port 1
It is configured such that the circumferential speed of the 8-force shaft at the positions 0a and 11a is greater than the circumferential speed of the output shaft at the position of the inlet port 8a of the suction oil hole 8.

A sub-lubricating oil passage 16 that supplies oil from the oil pan 2 is connected to the main lubricating oil passage A, and a flow of oil from the main lubricating oil passage A to the oil pan 2 is connected to the sub-lubricating oil passage 16. A one-way valve 17 is provided that prevents oil from flowing from the oil pan 2 and only allows flow from the oil pan 2 to the main lubricating oil path γ.

Next, the effect will be explained.

(a) When the engine is running When the engine 1 is running, the oil pump 3 operates to suck up oil from the oil pan 2, and the pressurized oil from the oil pump 3 is delivered to the control valve unit 5 via the pump discharge oil passage 4. The lubricating oil is supplied from the control valve unit 5 via the main lubricating oil passage 7 to the position of the suction oil hole 8 of the transmission output shaft 6 .

The oil fed into the suction oil hole 8 provided in the radial direction of the transmission output shaft 6 further passes through an axial oil passage 9 provided in the direction of the transmission output center axis, and passes through the transmission output shaft 6. The oil is supplied to the parts that require lubrication from the discharge oil holes 10 and 11 provided in the radial direction of the engine, thereby ensuring lubrication performance during normal driving.

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 side, no oil leaks through the sub lubricating oil passage 16.

(b) When traveling while being towed When traveling while being towed, the oil pump 3 does not operate because the engine 1 is stopped, or the oil pump 3 does not operate because the vehicle is being towed, and as the wheels rotate, the transmission output shaft 6 rotates.

At this time, negative pressure is generated at the position of the suction oil hole 8 and the position of the discharge oil hole 10.1+ provided on the transmission output shaft 6, but the circumferential speed of the output shaft at the position of the discharge oil hole +0.11 is Since the circumferential speed of the output shaft is higher than the position of the suction oil hole 8, the discharge oil hole 1
The negative pressure at the 0.11 position exceeds the negative pressure at the suction oil hole 8, indicating a pumping action that sucks up oil due to the negative pressure difference.

Therefore, the oil in the oil pan 2 is sucked up through the sub-lubrication oil passage 16 by opening the one-way valve 1a, passes through the suction oil hole 8 through the shaft center oil passage 9, and is supplied from the discharge oil hole 011 to the parts that require lubrication. , lubrication performance is ensured during towed driving.

Moreover, if the transmission output shaft 6 rotates at a high speed (the difference in circumferential speed of the output shaft between the position of the discharge oil hole 10.11 and the position of the suction oil hole 8 becomes large, the negative pressure difference also becomes large). The amount of oil supplied to parts that require lubrication from the discharge oil holes 1o and 11 increases as the speed of towed vehicle increases, and even when traveling at high speed, the amount of oil supplied to parts that require lubrication increases. It has a lubricating effect that prevents seizure of bearings, etc.

As explained above. In the automatic transmission lubricating device of the first embodiment, the oil discharge hole 10.11 and the suction hole 8 on the transmission output shaft 6, which rotate with the rotation of the wheels during towed driving, are provided in the circumferential direction. A negative pressure difference is generated due to the speed difference, and this negative pressure is used to suck up oil from the oil pan 2 and supply oil from the discharge oil holes 10 and 11 to parts that require lubrication. To provide a one-way valve 17 that is advantageous in terms of space and cost by simply adding it to an existing lubrication device, while ensuring high lubrication performance during towed driving without compromising lubrication performance during normal driving. I can do it.

(Second example) Next, a second example will be described.

FIG. 2 is a diagram showing a lubricating system for an automatic transmission according to a second embodiment. , 1+
In the second embodiment, the transmission shaft is connected to the input shaft 18.a. Intermediate shaft 19. The output shaft 2o is composed of three shafts, and although the difference in shaft diameter is set slightly, the discharge oil holes 21, 22.2 are mainly due to the difference in rotational speed of each shaft.
3.24 respective outlet ports 21a, 22a.

This is an example in which a peripheral speed difference is provided between 23a, 24a and the inlet boat 8a of the suction hole 8.

In FIG. 2, 9a, 9b, 9c are the input shaft 18, the intermediate shaft 19. This is an axial oil passage formed in each of the output shafts 2o.

Note that the other configurations are the same as those in the first embodiment, so corresponding configurations are given the same reference numerals and explanations will be omitted.

Operationally, during towed driving, the rotational speed N of the input shaft 18 connected to the turbine runner of the torque converter,
There is a relationship of N, <N, <No between the rotation speed Nv & of the intermediate shaft 19 on which a planetary gear etc. is provided, and the rotation speed N0 of the output shaft 20 connected to the wheel. 2
Each outlet port 21a, 22a, 1, 22, 23, 24,
By creating a circumferential speed difference between 23a, 24a and the inlet port 8a of the suction hole 8, lubricity during towed travel is ensured.

That is, the second embodiment also exhibits the same functions and effects as the first embodiment.

Although the embodiment has been described above based on the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change within the scope of the gist of the present invention, it is included in the present invention. .

(Effects of the Invention) As described above, in the lubrication device for an automatic transmission, the present invention provides a lubricating system for an automatic transmission that has a discharge oil hole on a transmission shaft that rotates with the rotation of wheels during towed driving, and a suction oil hole. A negative pressure difference is created between the holes and the peripheral speed difference, and this negative pressure is used to suck up oil from the oil pan and supply oil from the discharge oil hole to parts that require lubrication, which saves space and costs. This is advantageous in that it is possible to ensure high lubrication performance during towed driving without impairing the lubrication performance during normal driving.

[Brief explanation of drawings]

FIG. 1 is an overall view showing the structure of a lubricating system for an automatic transmission according to a seventh embodiment of the present invention, and FIG. 2 is a general view showing the structure of a lubricating system for an automatic transmission according to a second embodiment of the present invention. 1... Engine 2... Oil pan 3... Oil pump 4... Pump discharge oil path 5... Control valve unit 6... Transmission output shaft Y... Main lubricating oil path 8. ...Suction hole 9...Axis oil passage 10.11...Discharge oil hole 16...Sub-lubrication oil passage 17...-One-way valve

Claims (1)

[Claims] 1) An oil pump that is operated by engine driving power to suck up oil from the oil pan, a main lubricating oil passage that supplies oil from the oil pump to a predetermined position on the transmission shaft via a control pulp unit, and the main lubricating oil passage. A suction oil hole that communicates with the transmission shaft and is provided in the radial direction of the transmission shaft, and an axial oil passage that communicates with the suction oil hole and is provided in the direction of the center axis of the transmission shaft, and that communicates with the axial oil passage. In the lubrication device for an automatic transmission, which is provided with a discharge oil hole provided in the radial direction on the transmission shaft at a position corresponding to a portion that requires lubrication, when the transmission shaft is rotated by a wheel, The circumferential speed of the shaft is larger than the circumferential speed of the shaft at the suction oil hole position, and a sub-lubricating oil passage that supplies oil from the oil pan is connected to the main lubricating oil passage. A lubricating device for an automatic transmission, characterized in that an oil passage is provided with a one-way valve that allows oil to flow only to a main lubricating oil passage.