JPS592648B2 - automobile clutch control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch control device that senses the presence or absence of gear shifting movement of a shift lever of a manual transmission of an automobile and supplies pressure oil to a clutch release servo to release the clutch.

An example of an application of this type of device is one in which a fluid coupling (for example, a torque converter) is installed between an engine and a clutch to complete a transmission relationship via fluid.

Fluid coupling (explained below using a torque converter as an example)
In the case where a torque converter is provided, pressurized oil is supplied to the torque converter, which is a working fluid that controls transmission and also acts as lubricating oil.

The pressure oil supplied to this torque converter and the pressure oil supplied to the clutch release servo are derived from one hydraulic source, and the pressure oil is constantly supplied to the torque converter. is common.

In such a device, if a predetermined flow rate sufficient to supply the clutch release servo is secured, the oil pump serving as the hydraulic pressure source discharges the predetermined flow rate even when pressure oil is not being supplied to the clutch release servo. This results in power loss.

On the other hand, when the flow rate of the oil pump is set in consideration of power loss, it is inevitable that the flow rate of the pressure oil supplied to the clutch release servo will be insufficient and the clutch release operation will be delayed.

The present invention has been made in view of the above points, and is intended to quickly release the clutch while taking power loss into consideration.When the clutch is released, the supply of pressure oil to the torque converter is cut off. This is what I did.

The present invention will be described below with reference to the drawings.

In FIG. 1, numeral 1 at the upper right is an input shaft of a manual transmission, which is connected to an output shaft 4 of an engine via a clutch 2 and a torque converter 3 in sequence.

The clutch 2 is released by a clutch release servo 5.

The clutch release servo 5 has a piston rod 5a connected to a clutch release fork 6, and is operated by hydraulic pressure supplied through an oil passage 7 to release the clutch 2.

Reference numeral 8 on the lower left side of FIG. 1 is an oil pump, which communicates with an oil tank 11 via an oil suction passage 9 and an oil strainer 10 in sequence, and its discharge port is connected to the body of a regulator valve 13 via an oil passage 12. 14 ports 14a.

The oil pump 8 is operated by the engine and pumps oil from the oil tank 11 to the port 14a of the regulator valve 13.

The regulator valve 13 supplies the pressure oil fed from the oil pump 8 to the oil passages 15 and 16, and regulates the oil pressure to a low first set pressure or a high second set pressure.

The body 14 has five ports 14 in addition to the port 14a.
b to 14f, the port 14b communicates with the oil passage 15, the port 14c communicates with the oil passage 16, and the port 14d
communicates with the oil passage 9 via an oil passage 17, and the port N4c communicates with the oil passage 15 via an oil passage 19 provided with a fixed orifice 18.
The port 14f communicates with an oil passage 20 to which the oil pressure of the oil passage 15 is selectively supplied.

The spool 21 fitted into the body 14 so as to be vertically slidable has four lands 21a to 21d.

The land 21a at the upper end of the spool 21 is connected to another land 21b.
, 21c, and 21d, and forms an oil chamber 22 that communicates with the port 14f.

The lands 21a and 21b are in the oil chamber 2 communicating with the port 14e.
form 3.

A snap ring 24 is attached to the lower end of the land 21d and the body 14.
A spring 26 is stretched between the retainer 25 and the retainer 25 .

When oil pump 8 is not operating, spool 2
1 is held in the illustrated position by a spring 26, the land 21c blocks the port 14a from 14d, and the land 21d blocks the port 14C from 14a. When the oil pump 8 is operating, hydraulic pressure is generated in the oil passage 15. .

When this hydraulic pressure is supplied only to the oil chamber 23, the spool 2
1 slides downward from the illustrated position, communicates port N4c with port 14a, and balances the downward biasing force due to the oil pressure in the oil chamber 23 with the force of the spring 26.
The degree of communication between a and 14d is controlled to adjust the oil pressure in the oil passages 15 and 16 to the second set pressure.

Furthermore, when the oil pressure in the oil passage 15 is supplied to both the oil chambers 22 and 23, the spool 21 slides downward from the illustrated position,
The port 14c is communicated with the port 14a, and the degree of communication between the ports N4a and 14d is controlled so as to balance the downward biasing force due to the hydraulic pressure in the oil chambers 22 and 23 with the force of the spring 26, thereby controlling the hydraulic pressure in the oil passages 15 and 16. Adjust the pressure to 1 set pressure.

The shift valve 27 switches the oil passage 7 to either the oil passage 15 or the oil passage 28 and connects it to the fixed orifice 41.
A supply control means is interlocked with the oil passage 16 to connect and cut off an oil passage 29 that supplies pressure oil, which is the working fluid for the torque converter provided with the hydraulic oil and for lubricating purposes. When the communication is established and pressure oil is supplied to the clutch release servo 5, the oil passage 29 is cut off from the oil passage 16, and the supply of pressure oil (hereinafter referred to as lubricating oil) to the torque converter 3 is cut off.

The body 30 has eight ports 30a to 30h, the port 30a communicates with the oil passage 15, and the port 30a communicates with the oil passage 15.
0b communicates with the oil passage 7, port 30c communicates with the oil passage 28, port 30d communicates with the oil passage 16, port 30e communicates with the oil passage 29, port 30f communicates with the reservoir,
The port 30g is an oil passage 3 provided with a fixed orifice 31.
The port 30h communicates with the oil passage 15 through the oil passage 33.
It communicates with

This oil passage 33 is communicated with and shut off from the reservoir 11 by a normally closed solenoid valve 34, and is communicated with the oil passage 20.

The solenoid valve 34 is a shift lever of the manual transmission.
The normally open type shift lever switch 36 incorporated in 35 and the normally closed type accelerator pedal linked to the accelerator pedal)
The oil passage 33 is operated by closing both of the reswitches 37 and communicates the oil passage 33 with the reservoir 11.

A spool 38 that is vertically slidably fitted into the body 30
．． are three lands 38a.

38b and 38c, and an oil chamber 39 communicating with the ports 30g and 30h is formed by the land 38a at the upper end.

A spring 40 stretched between the lower end of the land 38c and the lower end of the body 30 urges the spool 38 upward, and the oil chamber 3
The spool 38 is held at the upward movement position shown in the figure when the hydraulic pressure equal to or higher than the first set pressure is not supplied to the spool 38.

Thus, the land 38c of the spool 38 and the ports 30e and 30d of the body 30 serve as supply control means for controlling the supply of pressure oil to the torque converter 3.

42 is a discharge oil passage control valve, and its body 43 has four ports 43a to 43d, the port 43a communicates with the oil passage 28, and the port 43b communicates with an oil passage 45 in which a fixed orifice 44 is provided. The ports 43c and 43d communicate with the reservoir 11.

A spool 46 that is vertically slidably fitted into the body 43
has two lands 4a and 46b, and the cross-sectional area of the oil passage from port 43a to port 43c changes as the spool 46 slides.

A spring 47 installed between the upper end walls of the body 43 at the upper end of the land 46a of the spool 46 biases the spool 46 downward to maintain contact between the lower end of the spool 46 and the upper side 48a of the bimetal 48. .

The lower side portion 48b of the bimetal 48 is received by an adjustment screw 49 screwed into the lower end wall of the body 43, and the bimetal 48 causes the spool 46 to slide in one direction in response to a rise in temperature.

50 is a bimetal holding pin.

The operation of the above configuration will be explained next.

During non-shifting, the solenoid valve 34 is closed when the shift lever switch 36 is opened, so the hydraulic pressure generated in the oil passage 15 due to the operation of the oil pump 8 is transferred to the regulator valve 1.
The oil is supplied to oil chambers 22 and 23 of No. 3.

Therefore, the regulator valve 13 is connected to the oil passages 15 and 16.
Supply set pressure.

In addition, in the shift y<) rev 27, the first set pressure is supplied to the oil chamber 39, so that the spool 38 slides to the lower movement position, cutting off the oil passage 7 from the oil passage 15 and closing the oil passage 7. 28 and also connects the oil passages 16 and 29.

Since no oil pressure is supplied to the clutch release servo 5, the clutch 2 is engaged.

Also, lubricating oil is supplied to the torque converter 3.

When changing gears, the shift lever switch 36 is closed and the accelerator pedal switch 37 is also closed, which opens the solenoid valve 34 and opens the oil chamber 3 of the shift valve 27.
9 and the oil chamber 22 of the regulator valve 13 are no longer supplied with the oil pressure of the oil passage 15.

Therefore, in the shift valve 27, the spool 38 slides to the upward position shown in the figure, switching the oil passage 7 from the oil passage 28 to the oil passage 15, and cutting off the oil passages 16 and 29.

On the other hand, the regulator valve 13 supplies the second regulating pressure to the oil passages 15 and 16, and the clutch release servo 5 receives the second regulating pressure.
The set hydraulic pressure is supplied, and the clutch release servo 5 operates to release the clutch 2.

Additionally, the supply of lubricating oil to the torque converter 2 is interrupted.

At the end of the shift, the shift lever switch 36 opens, so the solenoid valve 34 closes again, and the oil pressure in the oil passage 15 is transferred to the oil chamber 39 of the shift valve 27 and the regulator valve 1.
The oil is again supplied to the oil chamber 22 of No. 3.

Therefore, in the shift valve 27, the spool 38 slides to the lower position, switching the oil passage 7 from the oil passage 15 to the oil passage 28, and communicating the oil passages 16 and 29. A first set pressure is supplied to lines 15 and 16.

Therefore, the oil in the clutch release servo 5 is transferred to the reservoir 11.
When the clutch release servo 5 is pulled back, the clutch 2 is engaged.

Also, the supply of lubricating oil to the torque converter 3 is restarted.

The cross-sectional area of the oil discharge passage from the clutch release servo 5 to the reservoir 11 is steplessly decreased or increased according to the rise or fall in temperature by the discharge oil passage control valve 42, thereby causing a change in the viscosity of the oil as the temperature changes. Therefore, the return speed of the clutch release servo 5 hardly changes even if the temperature changes.

Note that the oil passage 45 provided with the fixed orifice 44 is essential if the design is such that the ports 43a and 43C are shut off at the highest temperature, but if the design is such that the ports 43a and 43c are in communication even at the highest temperature. It is not necessary if you do this.

In addition, the upper end of the spring 47 of the discharge oil path control valve 42 is no longer supported by the upper end wall of the body 43, but is supported by a member that can move up and down, and this member is linked to the accelerator pedal, so that the amount of depression of the accelerator pedal can be adjusted more or less. port 4 according to
If the cross-sectional area of the oil passage from 3a to 43C is increased or decreased, the clutch engagement timing can be changed suddenly or gradually depending on how much the accelerator pedal is depressed even at the same temperature.

As described in detail above, according to the present invention, there is provided a hydraulic source, and a clutch release that releases a clutch that connects and disconnects the transmission relationship between the engine and the manual transmission in response to the supply of pressure oil from the hydraulic source. A servo, a shift valve that supplies and discharges pressure oil from a hydraulic source to the clutch release servo, a shift valve control means that senses the presence or absence of gear shifting movement of the shift lever of a manual transmission and controls the switching operation of the shift valve, and an engine. It has a supply control means for appropriately supplying pressure oil from a hydraulic source to a fluid coupling that completes a transmission relationship through fluid between the clutch and the clutch, and a supply control means for appropriately supplying pressure oil from a hydraulic source to the fluid coupling when the shift valve supplies pressure oil to the clutch release servo. By using an automobile clutch control device in which the supply control means is linked to a shift valve to cut off the supply of pressure oil, the lubricating oil supply path to the torque converter is cut off when the clutch is released, so the clutch release servo is not turned on. The amount of oil supplied is increased compared to the conventional method, and as a result, the clutch can be released more quickly than the conventional method, and the structure is also extremely simple.

In addition, as in the example, when the clutch is not released, the oil pump's discharge oil pressure is regulated to a low pressure to reduce power loss due to the oil pump and improve the durability of each part, and when the clutch is released, the oil pump's discharge oil pressure is adjusted to a high pressure. When the pressure is regulated, this high pressure does not act on the torque converter, so there is no need to provide high rigidity to the torque converter, and a lightweight and inexpensive torque converter can be used.

[Brief explanation of drawings]

The drawing is a circuit diagram of an embodiment of the present invention. 1... Input shaft of manual transmission, 2... Clutch, 3... Torque converter, 4...
...Engine output shaft, 5...Clutch release servo, 8...Oil pump, 13...
...Regulator valve, 27-°...Shift valve, 35...Shift lever-136...
Shift lever switch, 16, 29...Lubricating oil supply circuit to torque converter.

Claims (1)

[Claims] 1 a hydraulic source, a clutch release servo that releases a clutch that connects and disconnects the transmission relationship between the engine and the manual transmission in response to the supply of pressure oil from the hydraulic source; a shift valve for supplying and discharging pressure oil; a shift valve control means for sensing the presence or absence of a shift movement of the shift lever of the manual transmission to control the switching operation of the shift valve; (1) supplying fluid between the engine and the clutch; supply control means for appropriately supplying pressure oil from the hydraulic source to the fluid coupling that completes the transmission relationship through the fluid coupling; A clutch control device for an automobile, characterized in that the supply control means is linked to the shift valve so as to cut off the supply of the clutch.