JP2762518B2 - Lubricating device for power take-off mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a lubrication device for a transmission mounted on a general vehicle, a large industrial vehicle or a large special vehicle, and more particularly to The present invention relates to an invention for controlling a lubricating oil amount to a power take-off mechanism of a transmission.

(Prior Art) FIG. 3 shows a conventional technique relating to the present invention.

In this prior art, the pressure oil output from the oil pump 10 is guided through an oil passage 11 to a primary regulator valve 13, which is a first pressure regulating valve. At this time, the pressure oil excessively pressurized by the oil pump 10 can be discharged to the outside of the oil passage 11 by the relief valve 12.

The pressure oil regulated by the primary regulator valve 13 is input to a secondary regulator valve 15 as a second pressure regulating valve via a second oil passage 14, and a part of the pressure is branched. And input to the torque converter T / C. And the secondary regulator valve
The pressure oil input to 15 communicates with the third oil passage 17 via the orifice valve 16. The third oil passage 17 is connected to a lubrication circuit PTOlub. Of a power take-off mechanism,
It is also connected to the transmission lubrication circuit T / Mlub.

The supply amount of the lubricating oil from the secondary regulator valve 15 to each lubrication circuit (PTOlub. And T / Mlub.) Is determined as follows. That is, the fourth signal output from the lower port 13a of the primary regulator valve 13
The pressure oil output through the oil passage 18 of the second oil passage acts on the secondary regulator valve 15 to move the spool 15a up and down, so that the second oil passage 14 and the third oil passage 17 It is determined by adjusting the degree of communication.

(Problems to be Solved by the Invention) Such a conventional hydraulic circuit has the following problems when a power take-off mechanism is attached to an automatic transmission. That is, since the supply amount of the lubricating oil to the hydraulic circuit is the same as when the power take-off mechanism is not provided, when the power take-off mechanism operates,
A part of the lubricating oil supplied to the transmission lubrication circuit T / Mlub. Is supplied to the power take-off mechanism lubrication circuit PTOlub. There was a problem that it was not possible to secure enough.

An object of the present invention is to provide a hydraulic circuit that can supply a lubricating oil amount required by the power take-off mechanism when the power take-off mechanism is operating.

[Configuration of the invention]

(Means for Solving the Problems) The technical means taken to solve such technical problems is to supply the lubricating oil to the lubricating circuit of the power take-off mechanism by adjusting the pressure oil from the hydraulic source. A first pressure regulating valve that generates a control pressure for controlling the pressure and outputs pressure oil to the lubrication circuit; and a pressure regulator that regulates output pressure oil from the first pressure regulation valve to lubricate the lubrication circuit of the power take-off mechanism. A second pressure regulating valve for supplying oil, a lubricating pressure regulating valve to which the control pressure is input to connect and disconnect the supply of lubricating oil to a lubricating circuit of the power take-off mechanism, and an output from the first pressure regulating valve. A first oil passage that guides the control pressure, a second oil passage that connects the first pressure regulating valve and the second pressure regulating valve, and a connection between the second pressure regulating valve and the lubricating pressure regulating valve. A lubricating device for a power take-off mechanism comprising a third oil passage, A solenoid valve connected to the second oil pressure control valve and capable of discharging the control pressure in the first oil passage to the outside by following the operation of the power take-off mechanism. The lubricating pressure regulating valve is disposed in the first oil passage and the third oil passage.
The oil path of the vehicle.

(Operation) By taking such technical means, even when the power take-off mechanism is operating, the amount of lubricating oil required by the power take-off mechanism can be supplied.

(Embodiment) An embodiment in which the technical means of the present invention is adopted will be described below with reference to the drawings.

FIG. 1 is a hydraulic circuit diagram of an automatic transmission according to the present invention.

The parts for supplying the pressure oil of the oil pump 10 serving as a hydraulic pressure source, the primary regulator valve 13 serving as a first pressure regulating valve, and the secondary regulator valve 15 serving as a second pressure regulating valve are described in the related art section. Since this is the same as the description, the description is omitted. In the drawings, the same portions are denoted by the same reference numerals.

In the present invention, the provision of the lubricating pressure regulating valve 19 connected to the third passage 17 and the provision of the lubricating pressure regulating valve 19 in the first oil passage 20 output from the upper port 13b of the primary regulator valve 13 Each oil passage communicating with the port 19a is provided. Further, the first oil passage 20 is provided with an electromagnetic valve 23 which opens and closes in conjunction with an operation switch 22 of a power take-off mechanism (PTO mechanism). As the solenoid valve 23, a normally open type solenoid valve (opened in a non-energized state) is used.

When the operation switch 22 of the power take-off mechanism is open, the solenoid valve 23 is in a non-conductive state, so that the first oil passage 20
The pressure oil inside is discharged out of the oil passage. At this time, the spool 19b of the lubrication pressure regulating valve 19 is located on the upper side as shown on the left side in the figure. In this state, the land 19c of the spool 19b is connected to the port 19
No lubricating oil is supplied to the lubrication circuit PTOlub. of the power take-off mechanism for closing the port d and the port 19e.

On the other hand, when the operation switch 22 of the power take-off mechanism is closed, the solenoid valve 23 is energized, so that the hydraulic circuit is closed, and the pressure oil in the first oil passage 20 is not discharged. That is, since the spool 19b of the lubricating pressure regulating valve 19 is located on the lower side as shown on the right side in the drawing, the port 19d and the port 19e communicate to supply lubricating oil to the lubricating circuit PTOlub. Of the power take-off mechanism. Become so.

When the power take-off mechanism is in the operating state, the pressure oil is supplied to the lower oil chamber 15a of the secondary regulator valve 15 via the first oil passage 20. Since the pressure acting on the land 15f is higher than the pressure acting on the land 15e, the spool 15b slides upward in the drawing. With this operation, the end of the spool 15b comes into contact with the end of the spool 15c to press the spool 15c upward. That is, since the land 15d moves upward, the second oil passage 14 and the third oil passage 17 communicate with each other to increase the amount of oil supplied to the lubrication adjusting valve 19.

FIG. 2 shows the relationship between the pressure oil controlled in the secondary regulator valve 15 as the second pressure regulating valve and the throttle opening. Changes in throttle pressure, changes in oil pressure when the power take-off mechanism is not operating,
Indicates pressure oil changes when the power take-off mechanism is operating.

〔The invention's effect〕

According to the present invention, when the power take-off mechanism is operated, the lubricating oil amount required by the lubricating circuit of the power take-off mechanism can be sufficiently supplied, and this has a great effect in practical use.

[Brief description of the drawings]

FIG. 1 shows a hydraulic circuit diagram of an automatic transmission according to the present invention,
FIG. 2 is a diagram showing a relationship between a change in hydraulic pressure in a second pressure regulating valve and a throttle opening, and FIG. 3 is a hydraulic circuit diagram of an automatic transmission according to the prior art. Hydraulic pressure source ... 10, first pressure regulator ... 13, second pressure regulator ... 15, lubrication pressure regulator ... 19, first oil passage ... 20, second oil passage ... 14, 3 oil passage ... 17, solenoid valve ... 23.

Claims (1)

(57) [Claims] A first pressure generating means for controlling a supply of lubricating oil to a lubricating circuit of a power take-off mechanism by adjusting a pressure oil from a hydraulic pressure source, and outputting a pressure oil to the lubricating circuit; A pressure regulating valve, a second pressure regulating valve which regulates output pressure oil from the first pressure regulating valve to supply lubricating oil to a lubricating circuit of the power take-off mechanism, and the power take-off mechanism which receives the control pressure and receives the control pressure. A lubricating pressure regulating valve for connecting and disconnecting the supply of lubricating oil to the lubricating circuit, a first oil passage which is output from the first pressure regulating valve and guides the control pressure, the first pressure regulating valve and the second pressure regulating valve.
A lubricating device for a power take-off mechanism comprising a second oil passage connecting the second pressure regulating valve and a third oil passage connecting the second pressure regulating valve and the lubricating pressure regulating valve. Is connected to the second pressure regulating valve, and an electromagnetic valve that enables the control pressure in the first oil passage to be discharged to the outside following the operation of the power take-off mechanism is arranged in the first oil passage. A lubricating device for a power take-off mechanism, wherein the lubricating pressure regulating valve is connected to the first oil passage and the third oil passage.