JPS6387325A - Two and four-wheel drive mode change-over device for automobile - Google Patents

Abstract

PURPOSE:To surely prevent an engine from blowing up, by providing an associating mechanism for changing over a free and lock change-over mechanism when the drive mode is changed over from the four-wheel drive mode into the two- wheel drive mode, so that the change-over operation is always carried out under the four-wheel drive lock condition. CONSTITUTION:When the drive mode is changed over from the two-wheel drive mode into the four-wheel drive mode, a slide shaft 46 in a 2-4 change-over mechanism 31 shifts rightward, and an associating lever 60 in an associating mechanism 68 is rotated clockwise. Further, an associating fork 62 in a free and lock change-over mechanism 56 is pushed leftward so that a shift fork 30 shifts rightward or toward the four-wheel drive side. Meanwhile, in association with the leftward movement of an associating sleeve 61 integrally incorporated with the associating fork 62, an engaging member 64 comes off from an engaging groove in a slide shaft 54 so that a shift fork 55 shifts leftward or toward the free side. As a result, the change-over from the two-wheel drive mode into the four-wheel drive mode is always made under the four-wheel drive lock condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a two-wheel/four-wheel drive switching device for an automobile.

(Prior Art and its Problems) The applicant of the present application has previously proposed a two-wheel/four-wheel drive switching device for this type of automobile that utilizes a differential device. This proposed example includes a differential device (hereinafter referred to as a center differential device) connected to the output shaft of a transmission, and a differential device connected to a first side gear of the center differential arrangement device to transmit its rotation to, for example, the rear wheels. 1 output shaft, a drive gear rotatably provided on the first output shaft, a second output shaft linked to the drive gear and transmitting its rotation to, for example, front wheels, and a differential case of the center differential device. A free lock switching mechanism connects and disconnects between the second side gear and the second side gear of the center differential device, and a 2/4 switching mechanism connects and disconnects between the second side gear and the drive gear. The combination of switching between the free/lock switching mechanism and the 2/4 switching mechanism results in two-wheel drive (hereinafter referred to as 2WD), four-wheel drive differential lock (hereinafter referred to as 4WD lock), and four-wheel drive differential free (hereinafter referred to as 4WD free). It is configured to selectively switch between three states. Here, 4WD lock means that the free/lock switching mechanism is in a locked state connecting the differential case and the second side gear, and
4 switching mechanism connects the second side gear and the drive gear; - In this case, the first output shaft and the second
It rotates integrally with the output shaft of the motor, providing four-wheel drive. On the other hand, 4WD free is when the free/lock switching mechanism is in the free state separating the differential case and the second side gear, and the 2/4 switching mechanism is connecting the second side gear and the drive gear. At this time, the first output shaft and the second output shaft are in a free relationship with each other, and four-wheel drive is performed by receiving the rotation of the differential case, and the rotation difference between the first output shaft and the second output shaft is is absorbed by the rotation of the center differential pinion. In 2WD, the free lock switching mechanism connects the differential case and the second side gear, and the 2/4 switching mechanism separates the second side gear from the drive gear, so that only the first output shaft rotates. do.

By the way, in the two-wheel/four-wheel drive switching device with the above configuration,
When switching from WD free to 2WD, before the free/lock switching mechanism shifts to the locked state that connects the differential case and the second side gear, if the 2/4 switching mechanism disconnects the 2' side gear and the drive gear. During this process, a no-load condition occurs in which the rotation of the differential case is not transmitted to either the first output shaft or the second output shaft, that is, the engine revs up, so some measures must be taken to avoid this situation. It is necessary to take measures.

(Objective of the Invention) This invention was made to solve the above-mentioned problem, and in a two-wheel/four-wheel drive switching device using a differential device, when switching from 4WD free to 2WD, the engine injection Two-wheel drive and four-wheel drive systems for automobiles that prevent bumps from occurring and allow smooth switching between two-wheel and four-wheel drive.
An object of the present invention is to provide a four-wheel drive switching device.

(Means for Achieving the Object) This invention connects a center differential device to the output shaft of a speed change example, and transmits the rotation to one of front wheels and rear wheels to a first side gear of this center differential device. A first output shaft is connected to the first output shaft, a drive gear is rotatably provided on the first output shaft, and the rotation is transmitted to the front wheel.

A second output shaft that transmits data to the other of the rear wheels is linked, while a free-lock switching mechanism connects and disconnects between the differential case of the center differential device and the second side gear of the center differential device; 2 between the second side gear and the drive gear
・2W0.4W by connecting/disconnecting with the 4-switching mechanism and switching between the free/lock switching mechanism and the 2/4-switching mechanism
In order to achieve the above object, the 2-wheel/4-wheel drive switching device for an automobile is configured to switch between three states: D-lock and 4WD-free.
A linking mechanism interlocking with the 2/4 switching mechanism is interposed between the lock switching mechanism and the 2/4 switching mechanism disconnects the second side gear from the drive gear when switching from 4WD free to 2WD. , by switching the free lock switching mechanism via the linkage mechanism, the differential case and the second side gear are connected, and the 2W
The vehicle is configured to go through a 4WD lock state during the transition to D, thereby preventing the engine from revving up.

(Example) Figures 1(a) to (d) show the main parts of a two-wheel/four-wheel drive switching device for an automobile, which is an embodiment of the present invention, and Figure 2 is an overall outline of the embodiment. Figure 3 (a), (b
) are the 4 Ws of the center differential device.
A schematic diagram of the D-lock and 4WD free states is shown.

In FIG. 2, the engine 1 is connected to the transmission 1fi2,
The output shaft 3 of the transmission 2 is a center differential device 4
It is connected to the differential case 5. The differential case 5 has a cylindrical shape, and inside thereof there is a pinion 7 rotatably provided on a trunnion shaft 6 protruding from the inner wall surface, and a first pinion 7 which is an output element of the center differential device 4. and a second side gear 8.9. The first side gear 8 is fixed to a rear export force shaft 10 disposed coaxially with the output shaft 3 of the transmission 2, and is configured to rotate while meshing with the pinion 7. On the other hand, the second side gear 9 is fixed to the front end of a cylindrical shaft 11 that is rotatably fitted onto the rear export force shaft 10, and is configured to rotate while meshing with the pinion 7. A spline wheel 12 is fixed to the rear portion of the cylinder shaft 11.

Top&l! At the rear of the cylinder shaft 11, there is also the rear export force shaft 1.
A cylindrical shaft 13 that is rotatably fitted to the outside of the cylindrical shaft 13 is arranged, and a front drive gear 14 is fixed to the rear of this cylindrical shaft 13. Further, a spline wheel 15 is fixed to the front portion of the cylinder shaft 13.

On the other hand, a front export force shaft 16 is arranged parallel to the rear export force shaft 10, and an output gear 17 having the same number of teeth as the front drive gear 14 is fixed to the rear end of the front export force shaft 16. Output gear 17 and the above front drive gear 14
are connected to each other via a chain 18, and are configured to transmit the rotation of the front drive gear 14 to the front export force shaft 16. A free-lock switching sleeve 19 is provided between the differential case 5 and the spline wheel 12, which is connected and disconnected by a shifting operation. Further, there is also a shift mechanism between the spline wheel 12 and the other spline wheel 15, which connects and disconnects the spline wheel 12 and the other spline wheel 15.
- A 4-switching sleeve 20 is provided. The center differential device 4, the spline wheel 12°15, the front drive gear 14, and the sleeve 1
9.degree. 20 and the like constitute a transfer 24 that transmits the power of the engine 1 to the rear wheels 22 via the rear wheel differential 21 or to both the rear wheels 22 and the front wheels 23. Note that the rotation of the front wheel output shaft 16 is transmitted to the front wheel 23 via the front wheel output shaft @24'.

Further, a carburetor 25 is connected to the intake side of the engine 1, and a supercharger 26 is connected to the carburetor 25. The supercharger 26 has a turbine 27 driven by the exhaust energy of the engine 1, and a compressor 28 that is directly connected to the turbine 27 and pressurizes intake air. A tank 29 is interposed.

2/4 switching sleeve 20 of the transfer 24 described above
A diaphragm transfer actuator 32 is connected to the diaphragm type transfer actuator 32 via a 2/4 switching mechanism 31 including a shift fork 30 shown in FIG. 1(a). The inside of this transfer actuator 32 is partitioned into two compartments 32a and 32b by a diaphragm, one of which is the compartment 32a.
is communicated with the first on-off valve 33. This first on-off valve 3
3 consists of a 3-boat, 2-position solenoid valve, and in FIG. 2, the OFF state of the solenoid is shown by a solid line, and the on state is shown by a phantom line. A second boat of the first on-off valve 33 is connected to the downstream side of the vaporizer 25 via a check valve 34, and a third boat is opened to the atmosphere via a filter 35.

Further, the other branch chamber 32b of the transfer actuator 32 is communicated with the second on-off valve 36.

This second on-off valve 36 is also composed of a 3-boat, 2-position solenoid valve, and the state in which the solenoid is turned off is shown by a solid line, and the state in which the solenoid is turned on is shown by a phantom line. In this case as well, the second boat is connected to the downstream side of the vaporizer 25, and the third boat is opened to the atmosphere via the filter 35. The solenoids of the first on-off valve 33 and the second on-off valve 36 are both
It is connected to a first power source 38 via a 4WD changeover contact 37a of a 2/4 changeover switch 37.

On the other hand, the side gear 39 of the front wheel differential 24' described above
A freewheel clutch 41 is provided between the shaft portion of the vehicle and the front axle 40 and is in contact therewith. A diaphragm freewheel actuator 42 is connected to the freewheel clutch 41 . This freewheel actuator 42 has a diaphragm with two parts 'J42a
, 42b, one of which, J42a, is in communication with a third quantity closing valve 43. This third on-off valve 43 is also composed of a 3-boat, 2-position solenoid valve, and the state in which the solenoid is turned off is shown by a solid line, and the state in which the solenoid is turned on is shown by a phantom line. The second boat of this third on-off valve 43 is also connected to the downstream side of the carburetor 25 via the check valve 34, and
The boat is open to the atmosphere through a filter 35. Further, the other branch chamber 42b of the freewheel actuator 42 is communicated with the first valve 33 described above.

- This sleeve 72 is located near the 2/4 switching sleeve 20.
A position switch 44 that turns on when detecting that the position switch 0 is displaced to the shift position connecting between the two spline wheels 12 and 15, that is, the shift position during four-wheel drive.
is located. The solenoid of the third on-off valve 43 is connected to a second power source 45 via the position switch 44.

The 2/4 switching mechanism 31 shown in FIG. 1(a) is provided with a slide shaft 46 parallel to the rear export force axis 10 of the transfer 24, and this slide shaft 46 has the 2/4 switching mechanism 31 shown in FIG. The aforementioned shift fork 30 that engages with the 4-switching sleeve 20 is slidably inserted. Figure 1 (
In Fig. 1(b), which shows a view from direction B of a),
The slide shaft 46 is supported by a transfer housing 47 so as to be movable back and forth, and a link fork 48 is integrally fixed to the slide shaft 46. Further, a frame 49 is slidably inserted into the slide shaft 46, and the mounting base 30a of the shift fork 30 is disposed between the mounting base 48a of the linking fork 48 and the right end of the frame 49. . The shift fork 30 is biased to the left in FIG. 1(b) via the frame 49 by a coil spring 50 interposed between the mounting base 48a of the linking fork 48 and the left end of the frame 49. has been done. In FIG. 1(C), which is a view seen from direction C in FIG. 1(a), a locking lever 52 is pivotally attached to the mounting base 30a of the shift fork 30 via a pin 51, and this locking lever 52 is The extension part 50a of the coil spring 50 is locked on the tip side of the lever 52,
As a result, the locking lever 52 is biased clockwise. Therefore, in the state shown in FIG. 1(C) in which the slide shaft 46 is shifted to the right, the tip of the locking lever 52 is locked to the left end of the transfer housing 47, and the shift fork 30 is shifted to the right. are doing. This shift position is determined by the 2/4 switching sleeve 20 in FIG.
corresponds to the 4WD shift position connecting between the two spline wheels 12° and 15. Further, a guide bin 53 is protruded from the mounting base 48a of the linking fork 48, as shown in FIG. 1(C), and the slide shaft 46 is As the locking lever 52 moves forward and backward, the locking lever 52
It is configured to swing around the fulcrum to engage and disengage from the left end side of the trunk housing 47.

On the other hand, another slide shaft 54 is arranged parallel to the slide shaft 46 of the switching mechanism 31 of 2 and 4, and this slide shaft 54 is provided with a free/lock switch shown in FIG. Shift fork 55 engaging sleeve 19
is inserted so that it can slide freely. This slide shaft 54. A free/lock switching mechanism 56 is configured by the shift fork 55 and the like. The above slide shaft 54
A coil spring 5 is fixed to the transfer housing 47 and is interposed between the left end of the frame 57 fitted on the slide shaft 54 and the mounting base 55a of the shift fork 55.
8, the shift fork 55 is shifted to the left in FIG. 1(b). At this time, the shift position is
In FIG. 2, the free/lock switching sleeve 19 corresponds to a free shift position where the differential case 5 and the spline wheel 12 are separated.

The 2/4 switching rock structure 31 and the free lock switching mechanism 56
A linking lever 60 pivotally supported on a shaft 59 is swingably provided between the linking lever 60 and one arm 6 of the linking lever 60.
0a is engaged with the linking fork 48 on the 2/4 switching mechanism 31 side. On the other hand, free lock switching I! A linking sleeve 61 is slidably inserted into the slide shaft 54 on the side of the mechanism 56, and the linking fork 6 engaged with the other arm 60b of the linking lever 60 is inserted into this sleeve 61.
2 is formed. In FIG. 1(d), which shows a view seen from direction D in FIG. 1(a), an engaging piece 63 is formed on the mounting base 55a of the shift fork 55.
3 engages with the linking fork 62, and is configured to push the shift fork 55 to the right against the biasing force of the coil spring 58 as the linking fork 62 moves to the right.

Further, the mounting base 55a of the shift fork 55 is formed with a cylindrical portion 65 in which an engaging body 64 is placed.
is pressed against the circumferential surface of the slide shaft 54 by a spring 66. On the other hand, an engagement groove 67 in which the engagement body 64 engages is formed in a part of the circumferential surface of the slide shaft 54.
When the shift fork 55 engages with the engagement groove 67, the shift fork 55 is shifted to the right side, that is, to the lock position. The coupling sleeve 61 is formed so as to be able to enter into the inner peripheral side of the mounting base 55a of the shift fork 55, and the sleeve 61 pushes the engagement body 64 so that the engagement body 64 is engaged with the engagement groove 67. It is configured to solve the problem. These link levers 60. sleeve 61
．． The engaging body 64 and the like constitute a linking mechanism @68 that switches the free lock switching mechanism 56 in conjunction with the 2/4 switching mechanism 31.

Next, the switching operation between two-wheel drive and four-wheel drive based on the above configuration will be explained.

As shown by the solid line in FIG. 2, in the 2WD state where the 2/4 changeover switch 37 is turned on to the 2WD changeover contact 37b side, the first on-off valve 33. Both solenoids of the second on-off valve 36 are turned off (shape R shown by a solid line). Therefore, one compartment 32a of the transfer actuator 32 is opened to the downstream side of the carburetor 25, and the other compartment 32b
is open to the atmosphere, and the transfer actuator 32
Shifts the slide shaft 46 of the 2/4 switch side 31 to the 2WD side, and thereby the 2/4 switch sleeve 20 moves to the 2WD side.
The spline wheels 12.15 are placed in a shift position that separates the two spline wheels 12.15. The operation of the 2/4 switching mechanism 31 at this time and the associated operations of the linkage mechanism 68 and the free/lock switching mechanism 56 will be described later. Furthermore, this 2W
In state D, the position switch 44 does not detect displacement of the sleeve 20 toward the 4WD side, so it is off.
The solenoid of the third lever 43 is also off (the state shown by the solid line). For this reason, the freewheel actuator 4
The second compartment 42a is open to the atmosphere, while the first on-off valve 33 is connected to the carburetor 25 side as described in 1)a, so the other compartment 42b becomes negative pressure, and the freewheel clutch 41 is placed at a shift position that separates the side gear 39 of the front wheel differential 24' from the front axle 40, as shown by the solid line in FIG.

On the other hand, the 2/4 changeover switch 37 is turned on to the 4WD changeover contact 37a side as shown by the imaginary line in FIG.
In this state, the solenoids of the first on-off valve 33 and the second on-off valve 36 are both turned on (state shown by imaginary lines), and the branch chamber 32a of the transfer actuator 32 is switched to atmospheric pressure, and the other branch chamber 32b is switched to negative pressure. In turn, the slide shaft 46 of the 2/4 switching mechanism 31 is shifted to the 4WD side, thereby placing the 2/4 switching sleeve 20 at a shift position connecting between the two spline wheels 12.15. The operation of the 2/4 switching mechanism 31 at this time and the associated operations of the linkage mechanism 68 and the free/lock switching mechanism 56 will be described later.

In this 4WD state, the position switch 44 detects the displacement of the sleeve 20 toward the 4WD side and turns on, so the solenoid of the third on-off valve 43 turns on (the state shown by the imaginary line), and the freewheel 7 The branch chamber 42b of the tuator 42 is switched to atmospheric pressure, and the other molecule f42a is switched to negative and positive, and the freewheel clutch 41 is displaced as shown by the imaginary line in FIG. 2, and the side gear of the front wheel differential 24' is 39 and the front axle 40.

As shown by the solid line in FIG. 2, in the 2WD state where the free/lock switching sleeve 19 is shifted to the lock side and the 2/4 switching sleeve 20 is shifted to the 2WD side, the engine 1 rotates. is transmission 2. Differential case 5. The force is transmitted to the pinion 7 and the first side gear 8, the rear export force shaft 10 rotates, and the rear wheels 22 are driven. Since the rotation of the differential case 5 is not transmitted to the front drive gear 14,
There is no front-wheel drive. That is, driving is performed by the rear wheels 22.

Further, as shown in FIG. 3(a), in the 4WDO state where the free/lock switching sleeve 19 is shifted to the lock side and the 2/4 switching sleeve 20 is shifted to the 4WD side, the differential case 5 The rotation of the sleeve 19. spline wheel 12
．． It is transmitted to the front drive gear 14 via the sleeve 20 and extends to the front export force shaft 16. In this way, both the front wheels 23 and the rear wheels 22 are driven.

Furthermore, as shown in FIG. 3(b), in the 4WD free state where the free/lock switching sleeve 19 is shifted to the free side and the 2/4 switching sleeve 20 is shifted to the 4WD side, the differential case 5 The rotation of the first. The rotation of the first side gear 8 is transmitted to the rear export force shaft 10, and the rotation of the first side gear 8 is transmitted to the second side gear 8.9.
The rotation of the side gear 9 is transmitted through the sleeve 20 to the front drive gear 14. The front export force is transmitted to the shaft 16, and the front wheel 2
3 and rear wheel 22 are both driven. Then, the difference in rotation between the front wheel 23 and the rear wheel 22 at this time is absorbed by the rotation of the nion 7.

As mentioned earlier, Figures 1 (a) to (d) are 2/4 cut 3A
This shows the state when the shift fork 30 on the mechanism 31 side is shifted to the 4WD side, and in this state, when another operation system for free/lock switching (not shown) is operated to the free side, the shift fork 30 on the side of the mechanism 31 is shifted to the 4WD side. Since the shift fork 55 on the lock switching mechanism 56 side is shifted to the lock side shift position by the free/lock switching operation system, ALI and II are released.
It is placed in a state where it is shifted to the free side by the biasing force of the coil spring 58. In other words, it is in a 4WD free state. When the 2/4 selector switch 37 is switched from this 4WD free state to the 2WD side, the transfer 24 is switched to the 2WD state shown in FIG. 2 by the following operation.

From the state shown in Fig. 1(b), turn the 2/4 selector switch 37 to 2W.
When switched to the D side, the transfer actuator 32 operates as described above, and the slide shaft 46 moves as shown in FIG.
) is pushed to the left. At this time, since the locking lever 52 is locked to one end of the transfer housing 47 as shown in FIG. 1(C), the shift fork 30 does not move, and only the slide shaft 46 moves. Along with this, 2.
Since the linking fork 48 on the 4-switching mechanism 31 side moves to the left in FIG. 1(b), the linking lever 60 rotates counterclockwise. As a result, the arm 60a of the link lever 60
The linking fork 62 on the side of the free lock switching mechanism 56 that is engaged is pushed to the right in FIG. The shift fork 55 on the switching mechanism 56 side shifts to the right, that is, to the lock side. Then, several engaging bodies 64 placed on the cylindrical portion 65 of the mounting base 55a of the shift fork 55 engage with the engaging groove 67 of the slide shaft 54, and the shift fork 55 is held at the lock side shift position. On the other hand, as the slide shaft 46 moves toward the 2WD side, the cam edge 52a of the locking lever 52 is guided by the guide pin 53 protruding from the mounting base 48a of the linking fork 48, and the locking lever 52 is moved to the 2WD side. As shown by the imaginary line in FIG. 1(C), the transfer housing 47 swings away from one end, and the locking lever 52 is unlocked. Then,
The frame body 49 is pushed leftward by the biasing force of the coil spring 50, and the shift fork 30 moves to the left side together with the frame body 49, and settles in the 2WD shift position. That is, the shift fork 30 is moved to the 2WD side after the shift fork 55 on the free/lock switching mechanism 56 side has been shifted to the lock side. In other words, switching from 4WD free to 2WD is always performed after the 4WD is locked. Therefore, during this switching, between the differential case 5 and the spline wheel 12, and between the spline wheel 12 and the spline wheel 15,
They do not fall into a state of separation from each other. In other words, the rotation of the engine 1 is the rotation of the front wheel 23. This prevents the engine 1 from erupting, which is not transmitted to any of the rear wheels 22.

On the other hand, when switching from the 2WD state to 4WD free, the transfer actuator 32 is operated by switching the 2/4 switching switch 37 to the 4WD side, and the 2/4 switching switch 37 is switched to the 4WD side.
The slide shaft 46 on the 4-switching mechanism 31 side is pushed rightward from the position shown by the imaginary line in FIG. 1(b) to the position shown by the solid line. Along with this, the linking lever 60 that the arm 60a engages with the linking fork 48 rotates clockwise, and the arm 60a rotates clockwise.
The linking fork 62 on the free lock switching mechanism 56 side that 0b engages with is pushed leftward. The shift fork 30 on the 2/4 switching mechanism 31 side shifts to the right, that is, to the 4WD side, as the slide shaft 46 moves. On the other hand, when the linking sleeve 61 integrated with the linking fork 62 moves to the left, the engagement groove 6 of the slide shaft 54 of the 2WD
The sleeve 61 pushes the engagement body 64 that was engaged with the locking mechanism 7, and the engagement is released, and the shift fork 55 on the free lock switching mechanism 56 side is shifted to the left, that is, to the free side by the biasing force of the coil spring 58. . In other words, free
Lock switching! The shift fork 55 on the fif 156 side is shifted to the free side after the shift fork 30 on the 2/4 switching Isohashi 31 side moves to the 4WD shift position. In other words, switching from 2WD to 4WD free is always performed after the 4WD is locked. In addition, in this switching operation, when the 2/4 switching sleeve 20 shifts to the lock side, the position switch 44 detects this as described above, and the freewheel clutch 41 shifts the side gear 39 of the front wheel differential 24'. The shaft portion of the shift fork 55 is connected to the front axle 40, but the timing for shifting the shift fork 55 to the free side is set after the locking operation of the freewheel clutch 41. The switching operation is performed through a process of 2WD → 4WD lock → freewheel clutch lock → 4WD free. Therefore, engine 1 does not rev up during this switching operation.

Note that switching from 2WD to 4WD lock is performed by regulating the shift fork 55 on the free-lock switching mechanism 56 side to the lock side by a free-lock switching operation system (not shown). As a result, the slide shaft 46 of the 2/4 switching mechanism 31 shifts to the 4WD side, and this movement causes the engagement between the engagement body 64 and the engagement groove 67 on the free lock switching mechanism 56 side via the linkage mechanism 68. Even if the shift fork 55 is released, the shift fork 55 is maintained at the lock side shift position.

(Effects of the Invention) As described above, according to the 2-wheel/4-wheel drive switching device for an automobile of the present invention, the 4WD When switching from free to 2WD, the free/lock switching mechanism is switched from the free state to the locked state before the 2/4 switching mechanism switches from 4WD to 2WD, so the switching operation is performed midway through. This is always done after the 4WD lock is activated, and this has the effect of reliably preventing the engine from revving up.

[Brief explanation of the drawing]

1(a) to 1(d) are diagrams showing the main parts of a two-wheel/four-wheel drive switching device for an automobile which is an embodiment of the present invention, FIG. 2 is a schematic diagram of the entire embodiment, and FIG. 3(a) and 1(b) are schematic diagrams showing the 4WD locked and 4WD free states of the transfer, respectively. 2...Transmission, 3...Output shaft, 4
... Center differential device, 5... Differential case, 8... First side gear, 9... Second side gear, 10... Rear export force shaft (first output shaft), 14...・Front drive gear, 16...front export force shaft (second output shaft), 31...2
・4 switching mechanism, 56...Free/lock switching mechanism, 68...Linkage mechanism

Claims (1)

[Claims] (1) A center differential device connected to the output shaft of the transmission, and a first center differential device of the center differential device.
a first output shaft that is connected to a side gear and transmits its rotation to one of the front wheels and rear wheels; a second output shaft that transmits transmission to the other of the wheels; a free lock switching mechanism that connects and disconnects between the differential case of the center differential device and a second side gear of the center differential device; It is equipped with a 2/4 switching mechanism that connects and disconnects between the side gear and the drive gear, and the combination of switching between the free lock switching mechanism and the 2/4 switching mechanism enables 2-wheel drive, 4-wheel drive differential lock,
A two-wheel/four-wheel drive switching device for an automobile configured to switch between three states of four-wheel drive differential free, wherein the 2/4 switching mechanism switches between the second and four-wheel drive states when switching from four-wheel drive differential free to two-wheel drive. Before separating the side gear and drive gear, the free switch is linked to this 2/4 switching mechanism.
The lock switching mechanism is operated to switch between the differential case and the second
The linkage mechanism that connects the side gear of the
A two-wheel/four-wheel drive switching device for an automobile, characterized in that it is interposed between a four-wheel switching mechanism and a free/lock switching mechanism.