JPH0242502Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a free-running 4-wheel drive vehicle in which the front and rear wheel drive systems are equipped with one-way clutches for forward and reverse movement. The present invention relates to a display device having a switching position.

[Conventional technology]

Conventionally, regarding this type of four-wheel drive vehicle, there is a prior art, for example, disclosed in Japanese Patent Application Laid-Open No. 15226/1983, in which one-way clutches for forward and reverse driving are installed in parallel in the middle of the drive system of the front and rear wheels, and automatic switching is performed. It is shown that either one is selected by the clutch and one-way 4WD driving is performed.

[Problem that the invention attempts to solve]

Therefore, in the above prior art, when the switching clutch is in the intermediate position and the forward and reverse one-way clutches are selected and engaged at the same time, the system becomes a direct-connection 4WD that directly connects the front and rear wheels, improving running performance on snowy roads, etc. obtain. In this case, direct 4WD is operated manually, and it is desirable to display it on a meter to distinguish it from one-way 4WD. Generally, when the direct 4WD switch is operated, the switch detects the intermediate direct 4WD position of the switching clutch.
Display the lamp on the meter.

In this way, if a direct 4WD detection switch is provided in the middle of the switching clutch, one-way 4WD
Even when switching between forward and backward positions in the case of
The switch turns on and off, causing the direct 4WD light to flash, potentially making the driver feel uneasy. Therefore, when there is a direct 4WD position between the front and rear switching positions of one-way 4WD, it is necessary to accurately display the information to the driver.

The present invention was developed in consideration of these points, and it is possible to change the forward and reverse positions of one-way 4WD
The object of the present invention is to provide a display device for a four-wheel drive vehicle that accurately displays information when operating a direct-coupled four-wheel drive vehicle.

[Means for solving problems]

In order to achieve the above object, the present invention provides a one-way clutch for forward and reverse movement in the middle of the drive system of the front and rear wheels, and the one-way clutch has a one-way 4WD forward and reverse position for selecting either one of them, and In the middle is a switching clutch with a direct 4WD position that selects both at the same time.
In a wheel drive vehicle, a direct-coupled 4WD switch that disables the switching and operates the direct-coupling 4WD position in the middle is connected to the circuit that switches the one-way 4WD of the switching clutch between forward and reverse, and the direct-coupling 4WD switch of the above-mentioned direct-coupling 4WD switch is operated. The side is configured to be connected to the meter indicator lamp via a direct-coupled 4WD position detection switch.

[Effect]

Based on the above configuration, in the case of normal one-way 4WD, the one-way
4WD switching is now possible, but even if the operating side of the switch is disconnected and the direct 4WD detection switch is turned on or off, the indicator lamp remains off. Then, operate the direct 4WD switch to connect directly.
When set to 4WD, the switch connects the indicator lamp, and when the detection switch is turned on, the indicator lamp lights up.

In this way, in this invention, for one-way 4WD,
Only when operating directly connected 4WD, it is possible to accurately display the information on the meter lamp.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.

In Fig. 1, to explain the transmission system and operation system of the four-wheel drive vehicle according to the present invention, an engine 1, a clutch 2, and a transmission 3 are arranged horizontally in the left-right direction of the vehicle body on the rear wheel side. A rear differential device 4, a transfer device 5, and a one-way clutch device 6 are arranged in sequence at the front, and power is transmitted from the one-way clutch device 6 to the front wheels 10 via a propeller shaft 7, a front differential device 8, and an axle 9. Part of the clutch 2, transmission 3, rear differential device 4, and transfer device 5 are housed in a transmission case 11 to form a transaxle type, and are connected to the transmission case 11 via an intermediate case 12. A one-way clutch device 6 is housed within the extension case 13.

The transmission 3 is configured to have a plurality of sets of shift gears 17 and a synchronizer 18 on an input shaft 15 and an output shaft 16 from the clutch 2 to obtain multiple gear stages, and the rear differential device 4 A drive gear 19 of the shaft 16 meshes with a final gear 20, and a differential device 21 attached to the final gear 20 is connected to a rear wheel 23 via an axle 22. The transfer device 5 is a full-time type in which a transfer gear 24 that meshes with the final gear 20 is integrally attached to a transfer shaft 25 in the left-right direction of the vehicle body, and the transfer shaft 25 has a pair of direction changers. It is connected to a drive shaft 28 in the longitudinal direction of the vehicle body via bevel gears 26 and 27.

The one-way clutch device 6 is connected to the drive shaft 28
Inner race shaft 29 coaxially arranged with respect to
A forward one-way clutch 30 and a reverse one-way clutch 31 are installed in parallel, and these drive shafts 28 and each one-way clutch 30, 3
1, an automatic switching clutch 32 is provided between the two. The automatic switching clutch 32 is configured such that a sleeve 34 that engages with a hub 33 that is integral with the drive shaft 28 moves in one or the other direction in the axial direction to switch between both one-way clutches 3.
The outer races 30a and 31a are configured to selectively engage with one or both of the outer races 30a and 31a at the same time.

Here, when the outer race 30a rotates in the direction of the solid arrow as shown in FIG. When the inner race shaft 29 rotates quickly in this direction, the engagement by the sprag 30b is released and this is allowed. Also, one-way clutch 31 for reverse
acts in exactly the same way when the direction of the sprag 31b is reversed and the outer race 31a and the inner race shaft 29 rotate in the opposite direction to the above, as shown in FIG. It engages when the race shaft 29 is faster.

On the other hand, the fork 38 of the rod 37 integrated with the diaphragm 36 of the negative pressure actuator 35 is
It is fitted into the sleeve 34 and the diaphragm 36
One negative pressure chamber 39a and the other negative pressure chamber 39b are,
Solenoid valve 41 via passages 40a, 40b
a, 41b, both solenoid valves 41a, 4
A negative pressure passage 42 from 1b communicates with the intake manifold of the engine 1 through a check valve 43 and the like. When one of the solenoid valves 41a, 41b is energized by a signal from the control circuit 44 and introduces negative pressure, the other is de-energized and operates so as to leak to the atmosphere, and thus the negative pressure chambers 39a, 39b
Applying negative pressure to one side of the diaphragm 36 displaces the sleeve 34 along with the rod 37 etc. to the front one-way 4WD forward position or the rear one-way forward position.
It is designed to move to the 4WD reverse position.

In addition, springs 45a and 45 are attached to the diaphragm 36 from both sides in the negative pressure chambers 39a and 39b.
b is energized, and both solenoid valves 41a, 41
When both the springs 45a and 45b are opened to the atmosphere due to de-energization, the springs 45a and 45b counterbore sleeves 34 are positioned in the middle and engaged with both one-way clutches 30 and 31 at the same time, resulting in a direct connection 4WD.

To explain the control system in Fig. 2, there is a reverse switch 50 that is turned on when shifting into reverse gear to detect forward or backward movement, a switch 51 that operates direct 4WD, a rod 37, etc., which are installed at an intermediate position of the switching operation system. It has a switch 52 that detects the direct 4WD position. Then, in the control circuit 44, the ignition switch 53 on the battery side is activated via the forward solenoid valve 41a to the contact 54a of the relay 54.
Then, the relay 5 is activated via the reverse solenoid valve 41b.
The contact point 54b of No. 4 is connected to the coil 54c of the relay 54 and the indicator lamp 55 via the reverse switch 50, respectively. The relay 54 switches the contact piece 54d to the contact point 54b when the coil 54 is energized during reversing, and this contact piece 54d is connected to the off contact 51a of the direct-coupled 4WD switch 51. Direct connection
The 4WD switch 51 switches the contact piece 51c to a contact point 51a to ground the contact piece 51c when the contact piece 51c is grounded and is off, and switches the contact piece 51c to a contact point 51b to disconnect the circuit of the relay 54 when the contact piece 51c is turned on. On contact 51 of this direct-coupled 4WD switch 51
b is connected to the indicator lamp 57 of the meter 56 via the direct 4WD detection switch 52.

Further, a lamp 59 that is turned on by a nighttime lighting switch 58 is incorporated into the direct-coupled 4WD switch 51. A forced 2WD switch 61 is connected to the circuit of the charge lamp 60 of the meter 56, so that when the vehicle is placed on a free roller for inspection or repair and is forced into a 2WD state, the charge lamp 60 displays the 2WD state. It's summery.

Next, the operation of the four-wheel drive vehicle and display device configured as described above will be explained.

First, during normal driving, direct 4WD switch 5
1 is turned off, the contact piece 54d of the relay 54 is connected to the ground and automatic switching becomes possible. Therefore, when the reverse switch 50 is turned off during forward movement, the contact piece 54d of the relay 54 contacts the contact point 54a to energize the forward movement solenoid valve 41a. Therefore, negative pressure is introduced into one negative pressure chamber 39a of the actuator 35 to move the sleeve 34 forward and engage the outer race 30a of the forward one-way clutch 30. As a result, the inner race shaft 29 is configured to transmit power to the drive shaft 28 via the forward one-way clutch 30, and the drive shaft 29 is connected to the drive shaft 28 during straight traveling.
If 8 rotates faster, one-way clutch 30
, and power is also transmitted to the front wheels 10. On the other hand, when the inner race shaft 29 rotates faster together with the front wheel 10 during turning, the engagement of the one-way clutch 30 is released, and the vehicle turns smoothly without causing the booking phenomenon, thus performing one-way 4WD driving.

When reverse switch 50 is turned on when reversing,
The contact piece 54d is switched to the contact point 54b by the relay 54, and the reverse solenoid valve 41b is energized to introduce negative pressure into the negative pressure chamber 39b. Therefore, the sleeve 34 now moves rearward to select the one-way clutch 31 for reversing, and when the drive shaft 28 rotates in the opposite direction, it acts in the same manner as described above, and in this case as well, one-way 4WD travel is achieved.

In the case of one-way 4WD driving, the on contact 51b of the direct-coupled 4WD switch 51 is disconnected, so that the direct-coupled 4WD switch automatically switches between forward and reverse.
Even if the detection switch 52 is turned on or off, the indicator lamp 57 remains off.

On the other hand, on snowy roads etc., the direct 4WD switch 51
When the switch is turned on, the contact piece 51c switches to the contact 51b, and the contact 51a is disconnected instead, and the relay 5 is turned on.
Automatic switching of the circuit 4 becomes a subordinate function. Then, the solenoid valves 41a and 41b are both de-energized and the negative pressure chambers 39a and 39b are opened to the atmosphere, so that the sleeve 34 is moved to the intermediate position by the springs 45a and 45b, and the outer races 30a and 31a of both one-way clutches 30 and 31 are mesh at the same time. Therefore, when turning when moving forward, under the condition that the one-way clutch 30 is released, the other one-way clutch 3
1 will be engaged, resulting in full-time direct 4WD driving.

And only in this case, the direct 4WD switch 5
The on-contact 51b of 1 is connected to the ground via the contact piece 51c, and a lamp display is possible.The direct-coupled 4WD detection switch 52
When it is detected and turned on, the lamp 57 is turned on and displayed by energization.

Although one embodiment of the present invention has been described above, it is not limited thereto. That is, the present invention can be applied to other free-running systems, and can also be applied to circuits that perform complex switching control.

[Effect of idea]

As described above, according to the present invention, when controlling one-way 4WD and direct-coupled 4WD in a free-running type, the meter lights up only when direct-coupling 4WD is operated, so there is no risk of causing a sense of anxiety to the driver. You can perform accurate operations without any problems.

It detects the direct 4WD position and lights up to display it.
Display is accurate.

The direct 4WD switch performs direct 4WD operation and lighting display function at the same time, simplifying the circuit.
There is no fear of malfunction or time delay.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing an embodiment of the display device of the present invention, Fig. 2 is a circuit diagram of the control system, Fig. 3 a shows a one-way clutch for forward movement, and Fig. 3 b shows a one-way clutch for reverse movement. be. 6... One-way clutch device, 30... One-way clutch for forward movement, 31... One-way clutch for reverse movement, 32... Switching clutch, 35... Actuator, 44... Control circuit, 50... Reverse switch, 51... Direct connection 4WD switch, 5
2... Direct 4WD detection switch, 57... Display lamp.

Claims (1)

[Scope of claim for utility model registration] One-way 4WD in which a one-way clutch for forward and reverse movement is provided in the middle of the drive system of the front and rear wheels, and one of the two is selected for the one-way clutch.
In a four-wheel drive vehicle equipped with a switching clutch that has forward and reverse positions, and a direct 4WD position in between that selects both at the same time, the circuit for switching between forward and reverse of the one-way 4WD of the switching clutch does not allow the switching. Connect the direct-coupled 4WD switch to the intermediate direct-coupling 4WD position, and then connect the direct-coupling 4WD operation side of the direct-coupling 4WD switch to the
A display device for 4WD vehicles that connects to the meter display lamp via a direct 4WD position detection switch.