JP2598476Y2 - Drive control device for transfer device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a transfer device, and more particularly, to a transfer device capable of selecting a drive system of a fixed split torque split (hereinafter referred to as "soft 4WD") in addition to 2WD and rigid 4WD. A drive control device.

[0002]

2. Description of the Related Art As a transfer device, for example, there is a transfer device which switches between 2WD and 4WD by a wet multi-plate clutch mechanism.

FIG. 4 shows a drive control device of a transfer device for controlling the wet multi-plate clutch mechanism. This drive control device includes a first oil pump 52 provided on a main shaft 51 of a transfer device (not shown), a DC motor 53 externally attached to the transfer device, and a second oil pump 52 driven by the DC motor 53. An oil pump 54, first and second oil pumps 52, 5
A regulator valve 61 for adjusting the hydraulic pressure of the hydraulic oil pressurized by 4; an on / off switch in response to an electric signal; a discharge port described later is sealed when the switch is off; A solenoid valve 63,
Shift valve 6 that supplies hydraulic oil of a predetermined hydraulic pressure to wet-type multi-plate clutch mechanism 65 when solenoid valve 63 is off.
2.

A first oil pump 52 and a second oil pump 54 draw in hydraulic oil from an oil reservoir 55 via an oil strainer 56 and a regulator valve 61 from oil passages 57, 58 via one-way valves 59, 60. , And the shift valve 62 is supplied with hydraulic oil of a predetermined hydraulic pressure.

The shift valve 62 includes a spring 62b
And a shift spool 62a biased by the shift spool 62a. The shift spool 62a is configured to move up and down depending on whether the solenoid valve 63 is on or off, that is, whether or not hydraulic oil is drained from the discharge port. I have.

FIG. 5 shows a sectional structure of the solenoid valve 63. The solenoid valve 63 supplies a supply port 71 to which the hydraulic oil is supplied, a discharge port 72 for draining the hydraulic oil, a ball 70 for appropriately opening and closing the supply port 71 and the discharge port 72, and moves the ball 70 up and down. A first wire that has an electromagnetic coil 73 and a lead wire 74 that supplies an electric signal to the electromagnetic coil 73 from a control device (not shown), and that seals the supply port 71 with a ball body 70 and receives no hydraulic oil; And a second mode in which the hydraulic fluid supplied from the supply port 71 by floating the ball 70 is discharged from the discharge port 72.

In the above configuration, when a switch (not shown) is switched to “2WD”, the control device causes the solenoid valve 63 to select the second mode. That is,
The electromagnetic coil 73 is excited to cause the ball 70 to float, and the outlet 72 is opened. When the discharge port 72 is opened, the hydraulic oil supplied to the solenoid valve 63 drains from the supply port 71 through the discharge port 72, so that no hydraulic pressure is applied to the shift spool 62a of the shift valve 62. As a result, the shift spool 62a Is lifted by the spring 62b to close the oil passage 64. Therefore, the hydraulic oil is not supplied from the oil passage 64 to the wet-type multi-plate clutch mechanism 65, and the wet-type multi-plate clutch mechanism 65 is set to the 2WD position.

On the other hand, when the switch is switched to "4WD", the control device causes the solenoid valve 63 to select the first mode. That is, the excitation of the electromagnetic coil 73 is stopped, the ball 70 is lowered by the elastic force of a spring (not shown), and the supply port 71 is sealed. When the supply port 71 is sealed, the oil pressure from the oil pumps 52 and 54 is applied to the shift spool 62a of the shift valve 62, and as a result, the shift spool 62a descends against the elastic force of the spring 62b to move down the oil passage 64. To release. For this reason, hydraulic oil of a predetermined hydraulic pressure is supplied from the oil passage 64 to the wet-type multi-plate clutch mechanism 65, and the wet-type multi-plate clutch mechanism 65 is set to the 4WD position. In addition, the drive control of the conventional transfer device
As the control device, for example, JP-A-3-121937
And JP-A-60-11439
There is. The tiger disclosed in JP-A-3-121937 is disclosed.
The drive control device of the transfer device supplies oil at a predetermined pressure.
The oil pump to be supplied and the motor that drives the oil pump
And a system that opens and closes the oil passage to the clutch with a rod.
Shift regulator valve and rod for spring force
First and second solenoid valves for shifting against resistance
And turning on / off the first and second solenoid valves.
Controls the opening of the oil path to the clutch by the combination of off
To select 2WD, rigid 4WD, and soft 4WD
Things. JP-A-60-11439
The drive control device of the transfer device
Oil pump that supplies oil and drives the oil pump
Opening / closing of oil passage to motor and clutch by spool
Change valve to rotate and solenoid to shift the spool
Id S2 and supplied from the oil pump to the change valve
And a solenoid S1 for controlling the pressure of the oil to be supplied.
The combination of ON / OFF of solenoids S1 and S2
By controlling the oil pressure supplied to the latch, 2WD
4WD and software 4WD. the above
JP-A-3-121937 and JP-A-60-11
No. 439, the drive control device of the transfer device.
According to the installation, 2WD, rigid 4WD, and soft 4W
D can be selected.

[0009]

[Problems to be solved by the invention] However, FIGS.
According to the drive control device of the conventional transfer device shown in FIG. 5, even after selecting the rigid 4WD, the oil pump 54
The driving motor 53 must be operated to continue supplying oil.
This leads to waste of power consumption and the like. Also,
JP-A-3-121937 and JP-A-60-114
No. 39, the drive control of a conventional transfer device.
According to the control device, rigid 4WD and soft 4WD
After selecting, run the motor that drives the oil pump
Oil must be supplied continuously, and waste of power consumption etc.
Was invited.

[0010] Therefore, the object of the present invention is 2WD and 4W.
D mode can be selected and the hydraulic pump
An object of the present invention is to provide a drive control device for a transfer device, which can suppress power consumption of a moving motor .

[0011]

The present invention achieves the above object.
Drive torque from the prime mover
Having a multi-plate clutch provided in a drive system transmitting to the wheels,
Applying a predetermined operating pressure to the multi-plate clutch,
The drive torque from the motor according to the predetermined operating pressure
In a transfer device for transmitting hydraulic fluid to the front and rear wheels at a predetermined ratio, hydraulic fluid is transmitted through a hydraulic fluid passage to the multi-plate clutch.
And a hydraulic pump for supplying oil to the
The hydraulic oil is interposed in the branched oil passage according to the drive mode.
A valve mechanism that generates a control oil pressure by reducing the pressure by exhausting the oil, and the control oil pressure and the oil that are interposed in the hydraulic oil passage.
Shift according to the oil pressure and pressure difference of the working oil passage on the pressure pump side.
A shift member that shifts the operation of the multi-disc clutch.
The hydraulic oil supplied to the hydraulic oil passage reaches the predetermined operating pressure.
When the shift member shifts,
The hydraulic oil passage on the latch side is connected to the hydraulic pump on the operation side.
Shift valve that shuts off the oil passage and the branch oil passage to form a closed circuit
And a drive control device for a transfer device, comprising:

[0012]

[0013]

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a drive control device for a transfer device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a drive control device for a transfer device according to the present invention. In this figure, the same parts as those in FIG. 4 are denoted by the same reference numerals and symbols, and a detailed description thereof will be omitted.

The drive control device of this transfer device is as follows:
An accumulator 75 for increasing the line pressure (circuit internal pressure) by compressing the piston 76, a shift valve 68 having a feedback circuit 66, and solenoid valves 63a, 63b for opening and closing the shift valve 68, that is, raising and lowering the shift spool 68a. The pressure control valve mechanism 69 and the one-way valve 67 control the flow of hydraulic oil in the direction of the arrow, and have a shock buffering passage 77 that applies a hydraulic pressure to the wet multi-plate clutch mechanism 65 in a stepwise manner.

The shift valve 68 is supplied via a shift spool 68a which moves up and down by a control oil pressure, a spring 68b for urging the shift spool 68 toward the control oil pressure, and a control oil pressure and a feedback circuit 66. And a sub-spool 68c that moves up and down based on the line pressure.

The solenoid valves 63a and 63b are shown in FIG.
In the first mode in which the supply port 71 is sealed by the ball 70 and the supply of hydraulic oil is not performed, the first mode has exactly the same configuration as the solenoid valve 63 described above.
In a second mode in which the hydraulic fluid supplied from the supply port 71 is discharged from the discharge port 72 by floating the liquid.

The solenoid valves 63a and 63b are
It is controlled as shown in Table 1 by a control device (not shown).

[Table 1]

The pressure regulating valve mechanism 69 is disposed in a branch oil passage 78 communicating with the supply port 71 of the solenoid valve 63b.
A regulator spool 69a for adjusting the degree of opening of the branch oil passage 78 according to the moving position;
Of the branch oil passage 78 by the control oil pressure of the branch oil passage 78 and the elastic force of the regulator spring 69b, that is, discharged from the solenoid valve 63b. It is configured to adjust the discharge amount of the hydraulic oil and adjust the control oil pressure applied to the shift spool 68a of the shift valve 68 to a predetermined value.

Next, the structure of the shift valve 68 will be described in detail with reference to FIGS. 2 (a), 2 (b) and 2 (c).

FIG. 2 (a) shows that 4D from the 2WD position.
W D operating state of the shift valve 68 at the time of transition to port Jishon is shown. When the shift spool 68a is a predetermined control oil pressure P _s are added, shifting the spool 68a is lowered while resisting the spring 68b, to open the oil passage 64 while closing the outlet 79. As a result, the hydraulic oil in the oil passage 64 flows in the direction of the arrow and is supplied to the wet multi-plate clutch mechanism 65 and the feedback circuit 66.

[0024] in FIG. 2 (b), the operating state of 4W D mode when the shift valve 68 is shown. The wet multi-plate clutch mechanism 65 switches to 4WD, and the shift spool 68
a control oil pressure P _s which is added to a, the line pressure P _r which is added to the sub-spool 68c are equal, the shift spool 68a and the sub-spool 68c is slightly increased, the oil passage in a state of closing the discharge port 79 64 Close. as a result,
Hydraulic oil is no longer supplied to the wet multi-plate clutch mechanism 65, and the supply path leading to the wet multi-plate clutch mechanism 65 is closed. Therefore, wet multi-plate clutch mechanism 65 is 4W D port Jishon is maintained at a constant line pressure P _r (= P _s).

FIG. 2C shows the operation state of the shift valve 68 in the 2WD mode. When the control oil pressure P _s to shift the spool 68a is no longer added, shifting the spool 68a is increased by the elastic force of the spring 68b, to open the discharge port 79 in a state that closes the oil passage 64. As a result, the hydraulic oil supplied to the wet multi-plate clutch mechanism 65 flows in the direction of the arrow and is discharged from the discharge port 79, and the wet multi-plate clutch mechanism 65 is at the 2WD position.

FIG. 3 shows a detailed structure of the pressure regulating valve mechanism 69. The pressure regulating valve mechanism 69, as described above, the regulator spool 69a, have a regulator spring 69b, braking the movement position of the regulator spool 69a which is determined by the elastic force of the control pressure P _s and regulator spring 69b, i.e., the branch oil Road 78
And adjusts the control pressure P _s to a predetermined value based on the opening.

Next, the operation of the present invention will be described. First, when a switch (not shown) is switched to “2WD”, the solenoid valve 63a is set to the second position by the control device.
Mode is controlled. That is, the electromagnetic coil 73
Are excited, and the ball 70 floats to open the discharge port 72.

In the above state, the hydraulic oil supplied to the solenoid valve 63a is drained from the supply port 71 through the discharge port 72, so that the shift valve 68
No control oil pressure is applied to the shift spool 68a, and as a result, the shift spool 68a floats by the spring 68b and closes the oil passage 64. For this reason, the oil passage 6
No hydraulic oil is supplied to the wet-type multi-plate clutch mechanism 65 from 4 and the wet-type multi-plate clutch mechanism 65 is a 2WD pojosin.

Next, when the switch is switched to "4WD", the control device controls the two solenoid valves 63a and 63b.
To select the first mode. That is, the electromagnetic coil 7
3, the ball body 70 is lowered by the elastic force of a spring (not shown), and the supply port 71 is sealed.

When the solenoid valves 63a and 63b take the first mode, the shift spool 6 of the shift valve 68
As a result, the shift spool 68a descends against the elastic force of the spring 68b to open the oil passage 64, and the wet multi-plate clutch mechanism 6
5 is supplied with hydraulic oil having a predetermined line pressure to set the wet multiple disc clutch mechanism 65 to the 4WD position. When the wet multi-plate clutch mechanism 65 switches to the 4WD position, the oil passage 6
Then, the supply of the hydraulic oil is cut off, and the supply path to the wet-type multi-plate clutch mechanism 65 is closed.

[0031]

[0032]

As described above, the drive control device of the transfer device according to the present invention includes two solenoid valves,
Because you perform shift control of the shift valve by the pressure regulating valve to control the emissions of arranged solenoid valve to the shift valve side, 2WD, so the 4WD Position emissions <br/> can be selected. In addition, since the shift valve is provided with a feedback circuit, after switching to 4WD, the 4WD position can be maintained without supplying hydraulic oil, and power consumption of the motor driving the oil pump is suppressed. be able to.

[0034]

[Effect of the Invention] As described above, according to the drive control device of the transfer device of the present invention, the operation up to the multi-plate clutch is achieved.
2WD and 4WD due to opening and closing hydraulic oil passage
It is possible to select the driving mode. In addition, multi-plate
After applying the specified operating pressure to the clutch, close the multi-disc clutch side.
The circuit is used to turn off the motor that drives the hydraulic pump.
Power consumption and the like can be suppressed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an operation state of a shift valve in one embodiment.

FIG. 3 is a sectional view showing a pressure adjusting valve mechanism according to one embodiment.

FIG. 4 is an explanatory view showing a drive control device of a conventional transfer device.

FIG. 5 is a cross-sectional view showing a solenoid valve used in a conventional drive control device.

[Explanation of symbols]

51 Main shaft 52, 54
Oil pump 53 DC motor 55, 55a,
55b Oil sump 56, 56a, 56b Oil strainer 57, 58 Oil passage 59, 60
One-way valve 61 Regulator valve 62 Shift valve 62a Shift spool 62b Spring 63, 63a, 63b Solenoid valve 64 Oil passage 65 Wet multi-plate clutch mechanism 66 Feedback circuit 67 One-way valve 68 Shift valve 68a Shift spool 68b Spring 68c Subspool 69 Pressure adjusting valve Mechanism 69a Regulator spool 69b Regulator spring 70 Ball 71 Supply port 72 Discharge port 73 Electromagnetic coil 74 Lead wire 75 Accumulator 76 Piston 77 Shock buffer path 78 Branch oil path 79 Discharge port

Claims (2)

(57) [Scope of request for utility model registration] The driving torque from the prime mover is controlled by the front wheels or
Equipped with a multi-plate clutch provided in the drive train that transmits to the rear wheels
Then, a predetermined operating pressure is applied to the multi-plate clutch,
The drive torque from the motive is determined according to the predetermined operating pressure.
In a transfer device for transmitting the distribution oil to the front wheels and the rear wheels at a distribution ratio, a hydraulic pump for supplying hydraulic oil to the multi-plate clutch via a hydraulic oil passage and a branch oil passage branched from the hydraulic oil passage are provided. And said
Pressure is reduced by discharging hydraulic oil according to the drive mode.
A valve mechanism for generating a control oil pressure, and the control oil pressure and the hydraulic pump
Shift according to the hydraulic pressure and pressure difference of the hydraulic oil passage on the pump side
A hydraulic fluid passage having a shift member on the side of the multi-plate clutch;
When the hydraulic oil supplied to the cylinder reaches the predetermined operating pressure.
And the multi-plate clutch is shifted by shifting the shift member.
And the hydraulic oil passage on the hydraulic pump side.
A shift valve mechanism that cuts off from the branch oil passage to make a closed circuit;
Drive control device of the transfer device characterized by comprising a. 2. The method according to claim 1, wherein the shift valve mechanism is a hydraulic pump.
Hydraulic oil introducing the hydraulic oil through the hydraulic oil passage
Inlet and the hydraulic oil introduced from the hydraulic oil inlet
Supply port for supplying to the working oil passage on the side of the multiple disc clutch
A control oil for introducing the control oil of the control oil pressure from the valve mechanism.
From the oil inlet and the hydraulic oil passage on the multi-plate clutch side
Introducing the hydraulic oil through a feedback circuit
Feedback that causes the pressure difference with the control oil
Port and supplied to the hydraulic oil passage on the side of the multi-plate clutch.
A discharge port for discharging the hydraulic oil, wherein the shift member
Closes the discharge port and the hydraulic oil introduction port.
And a first position for opening the supply port, and the discharge port and
And closing the hydraulic oil introduction port, and closing the supply port
Opening the second position, the outlet and the supply port,
A third opening and closing the hydraulic oil inlet
2. The drive control device for a transfer device according to claim 1, wherein the drive control device shifts to a position according to an operation mode .