JPS6243320A - Driving-power distribution switching controller for four-wheel drive car - Google Patents

Abstract

PURPOSE:To prevent each abrasion of a shift fork lever and a dog clutch by constituting a control means so that an actuator is driven in the reverse direction by a lock signal and a fork rod is positioned at a regular position, in the captioned device in part time system. CONSTITUTION:When a drive selecting switch 52 is closed, in order to perform the switching from 2-drive state to 4-drive state, a 4-driving motor relay switch 54 is closed by the 4-drive signal (b) of a controller 50, and a motor 21 is driven to the 4-drive side. Therefore, a driving piece 26 turns to tilt an actuator 23. Then, a sift lever 22 tilts through a connecting rod 24, and a fork rod 31 shifts to the 4-drive side, and engages a stopper ball 32 with a stopper groove 31. Then, the driving piece 26 revolves reversely to revolve the motor 21 reversely, and an actuator lever 23 is set free. Therefore, each abrasion of a shift fork lever and a dog clutch can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a four-wheel drive vehicle, which is generally called a part-time system, and which is capable of switching drive power distribution between two-wheel drive mode and four-wheel drive mode. The present invention relates to a driving force distribution switching control device.

(Prior Art) As a conventional drive force distribution switching control device for a four-wheel drive vehicle, one shown in FIG. 6, for example, is known.

This conventional device has a waiting mechanism added to the device equipped with a dog clutch as described in Japanese Utility Model Application Publication No. 59-30725, and has the configuration described below.

This conventional device transfers 02.0 as shown in the figure.
Actuator 04. A waiting mechanism 06° and a control device 08 are provided.

The transfer 02 is provided in the drive transmission system to the front and rear wheels, and is equipped with 1,010 spikes.

The dog clutch O1O is always engaged with a first crunch rod 012 to which drive is constantly transmitted from the front wheel side.
It is provided so as to be able to slide and engage with a second clutch rod 014 which is provided with the same axis as the clutch rod 012.

The actuator 04 is connected to the motor 01 around the axis 016.
The transfer device 02 is provided with a shift lever 020 that is tilted by a lever 8, and the transfer 02 is switched by tilting the shift lever 020.

The waiting mechanism 06 is provided between the shift lever 020 and the dog clutch 010, and elastically transmits the operation of the shift lever 020 to the dog clutch O1O. It is equipped with

The fork rod 022 is provided so as to be slidable by tilting the shift lever 020, and the position is regulated between the two-wheel drive position and the four-wheel drive position by the stopper means 024. 0
32 (4WD) is formed.

The stopper means 024 is provided on the fork rod 022 and includes a stopper pole 034 that is engaged with the stopper IMO 30, 032 and a spring 036 that biases the stopper pole 034 toward the fork rod 022.

The shift fork 026 transmits the movement of the fork rod 022 by the actuator 04 to the dog clutch 010.The shift fork 026 transmits the movement of the fork rod 022 by the actuator 04 to the dog clutch 010. A shift fork lever 046 is formed that is elastically supported by the fork rod 022 and is engaged with the dog clutch 010.

The control device O8 is connected to the motor 018, and outputs a driving force distribution switching signal a and a drive stop signal S to the motor 018 by switching a changeover switch 048, and at the same time detects the long drive state of the actuator 04. The lock sensor 050 is connected to a lock sensor 050 that outputs a lock signal C.

Therefore, this conventional device operates as follows.

First, when switching from 2-wheel drive to 4-wheel drive.

When the changeover switch 048 is turned on, the 4-drive signal al is sent from the control device 08 to the motor 018 as the drive distribution switching signal a.
is output.

The motor 018 is driven by this 4-wheel drive signal al, and the shift lever 020 is tilted toward the 4-wheel drive side around the shaft 016.
Accordingly, the fork rod 022 has a stopper pole 0
34 and the stopper groove 032 are engaged (4-wheel drive position)
(hereinafter referred to as 4WD position), and at that position, the position is regulated by a stopper pole 034.

When the fork rod 022 is restricted to the 4WD position,
The actuator 04 enters the drive lock state, the lock sensor 050 outputs a lock signal C to the control device 08, the control device 08 outputs a drive stop signal to the motor 018, and the driving of the motor O18 and the actuator 04 is stopped. .

Also, by sliding the fork rod 022 to the 4WD position, the collar 038.040 of the shift fork 026
The spring 044 between the shift fork 0 is shortened and the shift fork 0
26 to the second clutch rod 014 of the dog clutch 010
The slide is biased in the direction of engagement.

The spring 044 remains in place for a short period of 1 hour until the dog clutch 010 is engaged with the second clutch rod 014, urging the shift fork 026 to slide. This is called a waiting state, and the dog clutch 010 is engaged with the second clutch rod 014. When the shift fork 014 and the shift fork 026 are aligned, the shift fork 026 is extended and the sliding force applied to the shift fork 026 is eliminated.

Next, when switching from 4-wheel drive to 2-wheel drive.

When the switching switch 048 is opened, the control device 08 outputs the 2-short signal a2 as the drive distribution switching signal a to the motor 018.

The motor 018 is driven by this 2-short signal a2, and the shift lever 020 is tilted toward the 2-drive side around the shaft 016.
Accordingly, the fork rod 022 has a stopper pole 0
34 and the stopper groove 030 are engaged in the two-wheel drive position (
(hereinafter referred to as the 2-wheel drive position), and the position is regulated by the stopper pole 034 at that position.

When the position of the fork rod 022 is restricted, the actuator 04 enters a drive lock state and the drive of the actuator 04 is stopped.

Furthermore, the sliding of the fork rod 022 shortens the spring 044 between the collars 038 and 040 of the shift fork 026, thereby urging the shift fork 026 to slide in the direction of disengaging from the second clutch rod 014 of the dog clutch 010.

Note that the spring 044 remains shortened and biases the shift fork 026 to slide until the dog clutch 010 is disengaged from the second clutch rod 014.

Then, when the clutch rod 014 is disengaged from the second clutch rod 014, it expands, and the force that urges the shift fork 026 to slide is lost.

(Problem to be Solved by the Invention) However, in such a conventional drive force distribution switching control device for a four-wheel drive vehicle, the drive is stopped by the control device when the actuator is in a drive lock state. Therefore, there were the following problems.

This will be explained using the above-mentioned conventional device as shown in FIGS. 7 to 9.

When the waiting mechanism 06 is in the waiting state, the shift fork 0
26 is biased to slide by a spring 044, and due to the biasing force, the shift fork lever 046 is pressed against the dog clutch 010 rotating together with the first clutch rod O12, and the shift fork lever 046 is rubbed against the dog clutch 010.

By the way, this pressing force of shift forfre/<-046 is determined by the amount of contraction of the spring 044, and also,
The amount of contraction is determined by the fork rod o22 being the stopper means 0.
24 is determined by the slide stroke of the 2nd drive position H4 drive position.

Therefore, the wear strength of the shift fork lever 046 is set based on the pressing force obtained by a predetermined sliding stroke of the fork rod 022.

However, the stopper means 024 has a so-called "play", and the slide stroke of the fork rod 022 may differ by the "play".

In the case of the conventional device shown in FIG. 6 above, for example, the seventh
If you overstroke as shown by the imaginary line with respect to the regular 4WD position shown by the solid line in the figure, or overstroke as shown by the imaginary line with respect to the regular 2WD position shown by the solid line in Figure FIJ8. or

This overstroke occurs when the drive force of the actuator 04 exceeds the reaction force from the stopper means 024's standard force and the transfer o2 side, causing the drive lock position to shift. In this case, the first position restriction is not performed by the stopper means o24, but is performed by the actuator o4.

Such an overstroke of the fork rod 022 causes the slide biasing force of the spring 044 to increase more than the set value, and as a result, the pressing force of the shift fork lever 046 also increases more than the set value.
As a result, the shift fork lever 046 and dog clutch OL.

The FrIJ abrasion strength of the IJJ was insufficient, and a problem occurred in that the shift fork lever 046 and the dog clutch 010 were worn out at the 5-contact portion.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned conventional problems, and to achieve this purpose, the present invention provides a driving force distribution switching control for a four-wheel drive vehicle. The equipment used the following methods.

A transfer equipped with a Dogura Sochi that transmits driving force between two wheels and four wheels is installed in the drive transmission system for the front and rear wheels, and an actuator equipped with a shift lever and a motor performs a switching operation of the transfer. A waiting mechanism is provided between the shift lever and the dog clutch to elastically transmit the operation of the shift lever to the dog clutch by a fork rod, a stopper means, a shift fork, and an elastic body, and the fork rod is configured to It is provided so that it can be slid by a shift lever, and
The shift fork is regulated between a two-wheel drive position and a four-wheel drive position by the shift means, and the shift fork is elastically supported by a fork rod and engaged with a dog clutch, and detects a drive lock state of the actuator. A driving force distribution switching control device for a four-wheel drive vehicle, wherein a lock detection means for outputting a lock signal to the control means is provided in the motor drive circuit, and a control means for outputting a driving force distribution switching signal to the actuator is provided. The control means is a control means that, when a lock signal is input, drives the motor in the opposite direction to position the fork rod at a normal position regulated by the stopper means.

(Function) Therefore, in the drive force distribution switching control device for a four-wheel drive vehicle of the present invention, since the above-mentioned means are used, when the drive distribution switching operation is performed, the operation is as follows.

The actuator slides the fork rod and the fork rod between the 2WD position and the 4WD position to enter the locked state, and then the fork rod is not restricted in position by the actuator at the lock position of the actuator, but is restricted in position by the stopper means. The actuator is driven by the control means in the opposite direction to the previous driving direction so that the actuator is positioned at the normal position.

Therefore, the pressing force of the shift fork lever on the dog clutch does not become excessive, and the force according to the set value can be obtained.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment shown in FIGS. 1 to 5 will be described.

A is a driving force distribution switching control device for a four-wheel drive vehicle according to an embodiment of the present invention, and transfer 10. Actuator 20
．． Waiting mechanism 30. Lock detection device (lock detection means) 4
0. A control device M (control means) 50 is provided.

The transfer 10 distributes the engine driving force to the front and rear wheels, and operates in a two-wheel drive state (hereinafter referred to as a two-wheel drive state) or a four-wheel drive state.
It puts the vehicle in wheel drive mode (hereinafter referred to as 4WD mode).
This transfer lO is connected to the first clutch rod 11. Second clutch rod 12. It is equipped with a dog clutch 13.

The first clutch rod 11 is connected to a constantly driven front wheel drive shaft (not shown) via gears 111 and 112.
It is constantly rotating and has a first spline external tooth 11 at one end.
3 is formed.

The second clutch rod 12 is connected to the first clutch rod 1.
1 and connected to the propeller shaft 14 that transmits drive to the rear wheels via bevel gears 15 and 16, and second spline external teeth 121 are formed at the end on the first clutch rod 11 side. has been done.

The dog clutch 13 has both clutch rods 11 and 12.
Depending on the meshing state with the
This dog clutch 13 has a cylindrical shape with spline internal teeth (not shown) formed on the inner periphery, and is meshed with the first spline external teeth 113 of the first clutch iron 11. At the same time, it is provided so that it can slide and mesh with the second spline external teeth 121 of the second clutch rod 12.

The transfer 10 is in a two-wheel drive state when the dog clutch 13 is engaged only with the first clutch rod 11, and is in a four-wheel drive state when it is engaged with both clutch rods 11 and 12.

Incidentally, the dog clutch 13 has an engagement groove 131 formed on its outer periphery.

The actuator 20 switches the drive state of the transfer 10 via a waiting mechanism 30, and includes an electric motor 21 and a shift lever 22.

The electric motor 21 serves as a drive source for the actuator 20, and the electric motor 21 is connected to the control device 50.
This is a forward/reverse motor driven by control signals from the

The shift lever 22 operates the waiting mechanism 30 by driving the electric motor 21.
2 is pivotally supported at one end by a bin 221 in a tilting and rotational manner,
Further, the other end is connected to an actuator lever 23 that is tilted by an electric motor 21 by a connecting rod 24 .

The actuator lever 23 is provided in the actuator case 25 so as to be tiltable about the bin 231.

This actuator lever 23 is tilted by a drive piece 26 provided inside the actuator case 25, shown in FIG.

The drive piece 26 is driven by the electric motor 21 to drive the bin 231.
It is rotatable about the same axis as the actuator lever 23, and is provided with protrusions 261 and 262 that engage with the actuator lever 23 and a notch 263 therebetween.

Then, the actuator lever 23 is tilted as the drive of the electric motor 21 is transmitted from the drive piece 26 while being engaged with the projections 261 and 262 of the drive piece 26.

The waiting mechanism 30 slides and urges the dog clutch 13 until the dog clutch 13 is engaged with the second clutch rod 12, or until the dog clutch 13 is disengaged from the second clutch rod 12 at t±, when the transfer 10 is switched to 2WD or 4WD. This waiting mechanism 30 includes a fork rod 31. Stopper pole as a means of stopping 32. Shift fork 33. A spring 34 is provided.

The fork rod 31 is slidably provided,
The fork rod 31 is slid by the shift lever/height 22 of the actuator 20 and is regulated between the 2-wheel drive position and the 4-wheel drive position by the stopper pawl 32. is fixed, and a 2-drive stopper groove 313 and a 4-drive stopper groove 314, which are engaged with the stopper pole 32, are formed at one end.

Incidentally, a retaining portion 315 that is engaged with the shift lever 22 is formed in the large diameter portion 311 .

Further, the stopper pole 32 is connected to the fork rod 31.
provided so as to be movable in a direction orthogonal to the axis of the
A spring 321 biases the fork rod 31 in the axial direction.

The shift fork 33 slides the dog clutch 13 to put the transfer lO in the 2-drive state and the 4-drive state. The fork rod 31 is provided between the large diameter portion 311 and the stopper portion 312 of the fork rod 31, and is elastically supported by the fork rod 31.

This elastic support of the shift fork 33 is provided by the collar 35.3.
6 and spring 34.

The collars 35 and 36 are slidably inserted into the shift fork 33 between the stopper rings 332 and 333, and are slidably and loosely fitted into the fork rod 31 between the large diameter portion 311 and the stopper portion 312. There is.

Further, a spring 34 is provided between the collars 35, 36 to bias the collars 35, 36 away from each other.

Therefore, when the fork rod 31 is slid, the space between the collars 35 and 36 is shortened, and the spring 34 is also shortened, and the elastic force of the spring 34 is applied to the stop/pull ring 3.
Collar 35.3 in contact with either 32.333
6 to the shift fork 33 and the shift fork 3
3 is urged to slide, and the slide urging force is transmitted from the shift fork lever 331 to the dog clutch 13, causing the dog clutch 13 to slide.

The lock detection device 40 detects that the actuator 20 is in the drive lock state, and activates the control device ff15.
This lock detection device 40 is provided in the current path to the electric motor 21,
The current value to the electric motor 21 is detected, and when the current value becomes excessive, the electric motor 21 (actuator 20)
Detected as locked state.

The control device 50 controls driving, stopping, and switching of the driving direction of the electric motor 21, and controls the operation of the actuator 20. The control device 2t50 controls the lock detection device 40. Power supply 51° drive selector switch 52. 2nd drive motor relay switch 53. 4th drive motor relay relay switch 549 position switch 55. It is connected to the reverse rotation stop switch 56.

Further, when the lock signal a is input, the control device 50 reverses the electric motor 21 and operates the actuator 20 so that the fork rod 31 is positioned in the normal position whose position is regulated by the stopper pole 32. Performs control to drive in the opposite direction.

The power source 51 is a vehicle-mounted battery.

The drive changeover switch 52 is provided in the vehicle interior and is used to switch the transfer 10 to a 2WD state or a 4WD state. When the drive changeover switch 52 is turned on, the control device 50 switches the 4WD motor relay switch 54. Outputs a 4-wheel drive signal as a drive distribution switching signal to ? by opening? 2 as a drive distribution switching signal to the drive motor relay switch 53
Output signal t)C.

The 2WD and 4WD motor relay switches 53 and 54 are provided between the power source 51 and the electric motor 21, and when the 2WD motor relay switch 53 is turned on, the electric motor 21 is driven to the 2WD side, and the 4WD motor is When the relay switch 54 is turned on, the electric motor 21 is driven to the 4WD side.

The position switch 55 and reverse rotation stop F switch 56 are
It is provided within the actuator case 25.

This position switch 55 is set so that the actuator lever 23 is
The control device 5 detects whether it is in the drive position or every fourth drive position.
As shown in FIGS. 2 and 3, it is fixed to the actuator case 25 and connected to the power source 51 via the control device 50. A fixed 2-drive position contact 551, a fixed 4-drive position contact 552, and a movable position contact 553 provided on a rotating plate 57 that rotates in conjunction with the drive piece 26 and grounded via a terminal 58. There is.

In the position switch 55, when the rotary plate 57 is rotated to the 2-drive position together with the drive piece 26, the fixed 2-drive position contact 551 and the movable contact 553 come into contact and the 2-drive position signal d is output. , when rotated to the 4WD position side, the fixed 4WD position contact 552 and the movable contact 553 come into contact and the 4WD position signal e
is output.

The reverse rotation stop switch 56 reverses the electric motor 21 after the electric motor 21 is locked under the control of the control device 50 described above, and then stops the reverse rotation stop switch 56. As shown in FIG. 2.3, the reverse rotation stop switch 56 also The position switch 5
5, a fixed two-drive reverse contact 561 and a fixed four-drive reverse contact 562 are fixed to the actuator case 25 and connected to the power source 51 via the control device 50, and a terminal 58 is provided on the rotary plate 57. A movable reversing contact 563 that is grounded through.

Note that when switching the transfer 10 from the 4-drive state to the 2-drive state, the reverse rotation stop switch 56 is activated as the drive piece 26 is rotated and the actuator lever 23 is tilted toward the 2-drive side. Fixed by rotating the rotating plate 57 2
The driving and reversing contact 561 and the movable reversing contact 563 are in contact with each other.
After the drive/reverse signal f is output and the actuator 20 is in a locked state, the electric motor 20 (rotating plate 57) is reversed until both contacts 561 and 563 are separated.

Further, when switching the transfer 10 from the 2-wheel drive state to the 4-wheel drive state, the reverse rotation stop switch 56
The fixed 4-drive reverse contact 562 and the movable reverse contact 563 come into contact with each other due to the rotation of the rotary plate 57 in conjunction with the rotation of the actuator lever 23 and the tilting of the actuator lever 23, thereby outputting the 4-drive reverse signal g, and the actuator 20 is locked. After that, the electric motor 20 (rotating plate 57) is reversed until both contacts 562 and 563 are separated.

Next, the operation of the embodiment will be explained.

First, the case of switching from the 2WD state to the 4WD state will be described.

When the drive changeover switch 52 which is in the open state is closed,
A 4-wheel drive signal is output from the control device 50 to the 4-wheel drive motor relay switch 54, the switch 54 is closed, and the electric motor 21 is driven to the 4-wheel drive side.

When the electric motor 21 is driven, first, the drive piece 26 is rotated, and after the protrusion 262 of the drive piece 26 contacts the actuator lever 23, the actuator 23 is tilted.

The tilting of the actuator lever 23 causes the shift lever 22 to tilt via the connecting rod 24, thereby moving the fork rod 31 into the 2WD position whose position is regulated by the engagement between the 2WD stopper groove 313 and the 2WD stopper groove 313 and the 2WD stopper groove 313. Slide it from the position to the 4WD side.

When the fork rod 31 is slid to the 4WD position where the position is regulated by engagement between the 4WD stator 2 bar groove 314 and the stopper pole 32, the actuator 20 is driven by the load from the shift fork 33 side and the stopper pole 32. When the lock state is reached, the moving motor 21
As a result, the lock detection bag q40 detects the lock state, and the control device 50 outputs the lock signal a, and the motor is stopped by the output of the 4-drive signal S, and the drive of the electric motor 21 is stopped. will be played.

By the way, when the drive piece 26 is rotated toward the 4-wheel drive side, the rotation plate 57 is accordingly rotated from the position shown by the solid line in FIG. 3 to the position shown by the imaginary line in FIG. ,
The position switch 55 and the reverse rotation stop switch 56 have a movable position contact 553 in contact with a fixed 4-wheel drive position contact 552, a movable reverse contact 563 in contact with a fixed 4-wheel drive reverse contact 562,
It will be in a state where it is thrown into the 4WD side.

Then, when the drive of the electric motor 21 is stopped and discharged once as described in L, the drive piece 26 and the rotating plate 57 rotate in the opposite direction, and the movable reversing contact 563 becomes the fixed 4-drive reversing contact. 562, the electric motor 21 is reversed. The solid line in FIG. 2 shows the relationship between the drive piece 26 and the actuator lever 23 at this time, and as shown in the figure, the seven actuator lever 23 is in a free state with respect to the drive piece 26.

In this way, when the actuator lever 23 is in the free state, there is no restraining force on the fork rod 31 by the shift lever 22, and the fork rod 31 is only positioned by the engagement between the stopper pole 32 and the 4WD stopper groove 314. It is located in the regular 4WD position.

The above-mentioned sliding of the fork rod 31 to the 4WD position is as follows:
From the large diameter portion 311 to the collar 36. Spring 34. Color 35. This is transmitted to the shift fork 33 and slides the dog clutch 13 which is engaged by the shift fork lever 331, but at this time the dog clutch 13 may not engage with the second clutch rod 12 immediately.

This is shown in FIG. 4, where the dog clutch 13 is in a position where it is in contact with the second clutch rod 12 without meshing with it.

In this way, the shift fork 33 and the fork rod 31
The difference in sliding amount is absorbed by shortening the spring 34, and the elastic force of the spring 34 urges the shift fork 33 to slide until the dog clutch 13 and the second clutch rod 12 are engaged. This state is called the wait state of the wait mechanism.

Thereafter, when the dog clutch 13 and the second clutch rod 12 are engaged, the transfer 10 as shown in FIG.
is in 4WD mode and drive power is transmitted to the front and rear wheels.

Next, the case of switching from the 4WD state to the 2WD state will be described.

When the drive selector switch 52, which is in the closed state, is closed,
A 2-short signal C is output from the control device 50 to the 2-drive motor relay switch 53, the relay inch 53 is closed, and the electric motor 21 is driven to the 2-drive side.

When the electric motor 21 is driven, first, the drive piece 26 is rotated, and after the protrusion 261 of the drive piece 26 contacts the actuator lever 23, the actuator lever 23 is tilted.

Tilting of the actuator lever 23 causes the shift lever 22 to tilt via the connecting rod 24, thereby moving the fork rod 31 from the regular 4WD position where the position is regulated by the engagement of the 4WD stopper groove 314 and the stopper pole 32. Slide it to the 2WD side.

When the fork rod 31 is slid to the 2WD position where the position is regulated by engagement between the 2WD stopper groove 313 and the stopper pole 32, the actuator 20 is in a drive locked state due to the load from the shift fork 33 side and the stopper pole 32. Then, the lock signal a is output from the lock detection device 40 and the driving of the electric motor 21 is stopped.

By the way, when the drive piece 26 is rotated toward the 2-drive side, the rotation plate 57 is rotated from the solid line position in FIG. 2 to the imaginary line position in FIG. In the switch 55 and the reverse rotation stop switch 56, the movable position contact 553 contacts the fixed 2-wheel drive position contact 551, and the movable reverse rotation contact 563 is also fixed? It comes into contact with the drive/reverse contact 561 and is in a state where it is turned on to the 2nd drive side.

Then, in the same manner as in the case of 4WD switching, the electric motor 21
Once the drive of
until the electric motor 21 separates from the fixed 2-drive reverse contact 561.
is reversed. The relationship between the drive piece 26 and the actuator lever 23 at this time is shown in FIG.
The cutter lever 23 becomes free with respect to the drive piece 26.

In this way, when the actuator lever 23 is in the free state, the restraining force on the fork rod 31 by the shift lever 23 is lost, and the position of the fork rod 31 is regulated only by the engagement between the stopper pole 32 and the 2-wheel drive stopper groove 313. It is located in the regular 2WD position.

The above-mentioned sliding of the fork rod 31 to the 2WD position is as follows:
From the stopper part 312 to the collar 35. Spring 34. Color 36. The dog clutch 13 is transmitted to the shift fork 33 and engaged by the shift fork lever 331, but at this time, the dog clutch 13 and the second clutch rod 12 may not be immediately disengaged from each other.

At this time as well, the waiting mechanism 30 is in a waiting state, and the shift fork 33 is urged to slide by the elastic force of the spring 34 until the dog clutch 13 and the second clutch rod 12 are disengaged.

Thereafter, when the dog clutch 13 and the second clutch rod 12 are disengaged, the transfer 10 enters a two-wheel drive state, as shown in FIG. 1, and driving force is transmitted only to the front wheels.

As described above, in the driving force distribution switching control system ff1A for a four-wheel drive vehicle according to the embodiment, when the waiting mechanism 30 is in the waiting state, the fork rod 31 is not positionally restricted by the actuator 20 and the stopper poles 32 and・
The spring 3 in the standby state is positioned at the normal position whose position is regulated by the 4WD stopper grooves 313 and 314.
The elastic force of No. 4 is obtained as set, so that the shift fork lever 331 does not press the dog clutch 13 with a pushing force higher than the set value, causing wear between the shift fork lever 331 and the dog clutch 13. .

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention may be modified without departing from the gist of the present invention. included.

For example, the lock detection means may be detected from actual movement of the actuator.

Further, the stopper means is not limited to a stopper pole as long as it restricts the sliding of the fork rod.

Further, in the embodiment, the fork rod is positioned at the normal position by freeing the shift lever, but the fork rod may be positioned at the normal position by tilting the shift lever.

Further, the transfer may be always rear-wheel drive.

(Effects of the Invention) As described above, in the driving force distribution switching control device for a four-wheel drive vehicle of the present invention, when a lock signal is input to the control means, the actuator is driven in the opposite direction and the fork rod is moved by the stopper means. By using a control means that positions the shift fork lever at the correct position where the position is regulated, the force applied to the dog clutch by the shift fork lever does not become excessive and the force as set is obtained, resulting in wear and tear on the shift fork lever and dog clutch. The effect of this is that you will not have to worry about it.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing a driving force distribution switching control device for a four-wheel drive vehicle according to an embodiment of the present invention, and FIGS. 2 and 3 are explanations showing switching operations of a position switch and a reverse rotation stop switch of the embodiment device. 4 and 5 are operation explanatory diagrams showing the waiting mechanism of the embodiment device, FIG. 6 is an overall view showing the conventional example device, and FIG.
8 and 8 are side views showing the main parts of the conventional device. 10... Transfer 13... Dog clutch 20... Actuator 21... Electric motor (motor) 22... Shift lever 30... Waiting mechanism 31... Fork rod 32... Stopper pole (stopper pole) Means) 33...
Shift fork 34...Spring (elastic body) 40...Lock detection device 50...Control device a...Lock signal b...4 short signal (drive distribution switching signal) C...2 short signal (Drive distribution switching signal) Patent application Nissan Shatai Co., Ltd. Figure 2

Claims (1)

[Scope of Claims] 1) A transfer equipped with a dog clutch for switching drive force distribution between two-wheel and four-wheel drive distribution states is provided in the drive transmission system for the front and rear wheels, and the transfer is switched between the shift lever and the motor. An actuator is provided between the shift lever and the dog clutch, and a waiting mechanism is provided between the shift lever and the dog clutch to elastically transmit the operation of the shift lever to the dog clutch by a fork rod, a stopper means, a shift fork, and an elastic body. , the fork rod is provided to be slidable by a shift lever, and
The stopper means positions the shift fork in a two-wheel drive position and a four-wheel drive position, and the shift fork is elastically supported by a fork rod and engaged with a dog clutch to detect and control the drive lock state of the actuator. A driving force distribution switching control device for a four-wheel drive vehicle, comprising: a lock detecting means for outputting a lock signal to the actuator; and a control means for outputting a driving force distribution switching signal to the actuator. A driving force distribution switching control device for a four-wheel drive vehicle, characterized in that when a signal is input, the control means drives the motor in the opposite direction to position the fork rod in a normal position regulated by a stopper means. .