JP2002087087A - Drive system change-over device for four wheel drive vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive system changeover device for a four wheel drive vehicle capable of immediately judging which condition (change-over position) the vehicle is currently by one glance or touching with a hand. SOLUTION: This drive system change-over device for the four wheel drive vehicle has a first selector switch 21 change-over between a 4WD condition and a 2WD condition, a second selector switch 22 changing over between a differential lock condition and the 4WD condition, and a shielding piece 23 movable to a first position where the first selector switch 21 is covered and the second selector switch 22 is exposed and a second position where the first selector switch 21 is exposed and the second selector switch 22 is covered. As for the shielding piece 23, its travel from the second position to the first position is prevented while the first selector switch 21 is changed over to a 2WD position, its travel from the second position to the first position is allowed while the first selector switch 21 is changed over to a 4WD position, its travel from the first position to the second position is prevented while the second selector switch 22 is changed over to a differential lock position, and its travel from the first position to the second position is allowed while the second selector switch 22 is changed over to the 4WD position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system switching device for a four-wheel drive vehicle provided with a changeover switch for switching between a differential lock state, a 4WD state, and a 2WD state on a handle portion.

[0002]

2. Description of the Related Art Conventionally, a four-wheel drive vehicle of this type has a two-wheel drive state (two-wheel drive state) in which the driving force of the engine is transmitted to a pair of left and right rear wheels, and two front wheels via a differential gear. In the 4WD state (four-wheel drive state) where the driving force of the engine is transmitted to the four wheels including the front and rear wheels by transmitting the driving force to the front and rear wheels, further, in the four-wheel drive state, the two front wheels are integrated. Some have a function of switching to a differential lock state to be driven, and a changeover switch for switching between them is provided near a grip portion of a handle like a motorcycle.

[0003]

However, in such a conventional device, the changeover switch is of a slide type which moves in a straight line, and the above-mentioned states are switched by changing the slide position. Therefore, in the determination method based on the slide position, it is difficult to determine at a glance or immediately by touching with a hand what state (switching position) is currently.

Accordingly, an object of the present invention is to provide a drive system switching device for a four-wheel drive vehicle that can determine at a glance or at a glance the current state (switching position) of the vehicle. .

[0005]

In order to achieve the above object, according to the present invention, a first switch for switching between a 4WD state and a 2WD state and a second switch for switching between a differential lock state and a 4WD state are provided. A changeover switch, a first position covering the first changeover switch and exposing the second changeover switch, and a second position exposing the first changeover switch and covering the second changeover switch. When the first switch is switched to the 2WD position, the shield is prevented from moving from the second position to the first position, and the first switch is Is switched to the 4WD position, the movement from the second position to the first position is allowed, and the second switch is switched to the differential lock position. The movement from the first position to the second position is prevented, and the movement from the first position to the second position when the second changeover switch is switched to the 4WD position. The drive system switching device for a four-wheel drive vehicle is adapted to allow the above.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, each of the first change-over switch and the second change-over switch is immersed in the switch base for each change-over operation. Projecting, while the shield moves in a direction intersecting the direction of immersion and projection of each switch,
When each of the switches is protruding from the switch base, the shield is configured to be prevented from moving by contacting the shield with a side portion of the switch.

According to a third aspect of the present invention, in addition to the configuration of the second aspect, the shield is rotatably supported at one end thereof around the axis with respect to the switch base. The direction along the axis and the immersion / projection directions of the respective switches are set to be substantially the same, and the other end of the shield is swingable, and the other end covers the respective switches. It is characterized by having done.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments.

1 to 8 show an embodiment of the present invention.

First, the structure will be described. Reference numeral 11 in FIG. 1 denotes a four-wheel drive vehicle. The four-wheel drive vehicle 11 has a pair of left and right front wheels 12 and rear wheels 13. The driving force from the engine 14 is transmitted in a switching manner, and the front wheels 12 are steered by the steering wheel 15.

As shown in FIG. 2, a drive system switching device 18 for switching the drive system of the front wheels 12 and the rear wheels 13 is provided near the grip portion 16 on the right side of the handle 15. . The drive system switching device 18 is integrally provided with a throttle lever 19.

The drive system switching device 18 includes a first switch 21 and a second switch 22 on a switch base 20.
And a shield 23 are provided.

The first changeover switch 21 switches between a 4WD state and a 2WD state, and a second changeover switch 22
Switches between a differential lock state and a 4WD state.

The first changeover switch 21 and the second changeover switch 22 are connected to the respective switches 21,
The switch 22 is disposed so as to be immersed or protruded from the switch base 20, and each of the switches 21 and 22 is structured to be held at the immersed position or the protruded position. The first changeover switch 21 has a projecting position of 2WD.
In the position, the immersion position is the 4WD position, and the second changeover switch 22 has the projection position in the differential lock position and the immersion position in the 4WD position.

As shown in FIG. 6, one end 23a of the shield 23 is rotatably supported on the switch base 20 around an axis 23b, and a direction along the axis 23b. The switches 21 and 22 are arranged so as to rotate in a direction intersecting the immersion / projection direction by setting the immersion / projection directions of the switches 21 and 22 to be substantially the same. With this, the other end 23c of the shield 23 is swingable.
2 is covered.

As a result, as shown in FIG. 5, the shield 23 covers the first switch 21 and the second switch 21.
As shown in FIG. 4, the first switch 21 is exposed and the second switch 22 is movably disposed between the first position where the switch 22 is exposed and the second position where the second switch 22 is covered. I have. The shield 23 is configured to be stopped and held at the first and second positions.

Further, the shield 23 is provided with each switch 2
When the switches 1 and 22 are protruding from the switch base 20, the rotation (movement) is prevented by contacting the side portions of the switches 21 and 22.

As a result, the shield 23 is connected to the first
When the changeover switch 21 is switched to the 2WD position, the movement from the second position to the first position is prevented, and when the first changeover switch 21 is switched to the 4WD position, the second position is switched to the second position. The movement from the position to the first position is allowed.

When the second changeover switch 22 is switched to the differential lock position, the shield 23 prevents movement from the first position to the second position, and the second changeover switch When 22 is switched to the 4WD position, movement from the first position to the second position is permitted.

Next, the case of switching between the 2WD state, the 4WD state and the differential lock state will be described.

In the case of switching from the 2WD state to the 4WD state In the 2WD state, the shield 23 is located at the second position shown in FIG. 4, and the shield 23 covers the second changeover switch 22 and is immersed (4WD position). And the first changeover switch 21 is in the protruding 2WD position. Then, the limit switch 25 of the actuator 24 is at a position shown by a solid line in FIG. 8, and the conductor 28 and the conductor 29 are in a conductive state.

In this state, when the first changeover switch 21 is immersed to the 4WD position, the code LR and the code Sb
Is conducted, a current flows through the exciting coil 35a of the second relay 35, and the relay contact piece 35b is excited to move to the position shown by the two-dot chain line in FIG.
Is conducted.

As a result, a current flows through the drive motor 26 of the actuator 24 and is rotated in a predetermined direction, whereby the limit switch 25 is translated downward in FIG. When the limit switch 25 is moved to a position (4WD position) indicated by a dashed line in FIG.
When the conduction between the conductor 8 and the conductor 29 is cut off and the energization state of the excitation coil 35a of the second relay 35 is released, the drive of the drive motor 26 is stopped.

By driving the drive motor 26, a differential gear (not shown) is operated to switch from the 2WD state to the 4WD state, and the motor 26 is stopped at the 4WD position by the movement of the limit switch 25, thereby causing the 4WD state. The state will be maintained.

In the 2WD state, since the first changeover switch 21 is in the protruding state as described above, the shield 2
3 cannot be moved to the first position, the second switch 22 is covered by the shield 23, only the first switch 21 can be operated, and the 2WD state is switched to the 4WD state. Since only the operation is possible, the reliability of the operation can be ensured.

When switching from the 4WD state to the differential lock state, in the 4WD state, the first and second changeover switches 2
Both 1 and 22 are in the immersion state (4WD position), and the shield 23 is in either the first position or the second position. Then, the limit switch 2 of the actuator 24
5 is located at a position indicated by a dashed line in FIG. 8, and the conductor 30 and the conductor 29 are in a conductive state.

From this state, if the shield 23 is at the second position, the shield 23 is rotated to the first position.
To the differential lock position.

In this state, the vehicle speed is detected by the speed sensor 38, and this signal is input to the control unit 39. When the vehicle speed is lower than a predetermined value, a current flows through the exciting coil 36a of the third relay 36, and the relay connection is established. Piece 36
b is excited to move as shown by the two-dot chain line in FIG. 8, and the terminals e and f are conducted, so that the code LR and the code GY
And the code Br conducts. As a result, a current flows through the exciting coil 35a of the second relay 35, and the relay contact piece 35b is excited and moved as shown by a two-dot chain line in FIG.
And the contact b are conducted.

As a result, a current flows through the drive motor 26,
By rotating in a predetermined direction, the limit switch 2
5 is translated downward in FIG. When the limit switch 25 is moved to the position indicated by the two-dot chain line in FIG. 8 (the differential lock position), the conduction between the conductor 30 and the conductor 29 is cut off, and the exciting coil 35a of the second relay 35 is turned off. The drive of the drive motor 26 is stopped by canceling the energized state.

By driving the drive motor 26, a differential gear (not shown) is operated to switch from the 4WD state to the differential lock state, and the motor 26 is stopped at the differential lock position by the movement of the limit switch 25. The differential lock state will be maintained.

In the case of switching from the differential lock state to the 4WD state In the differential lock state, the first changeover switch 21 is in the immersion state (4WD position), and the shield 23 covers the first changeover switch 21 at the first position. At the same time, the second changeover switch 22 is in a protruding state (diff lock position). And the limit switch 25 of the actuator 24 is
At the position shown by the two-dot chain line in FIG. 8, the conductor 31 and the conductor 29 are in a conductive state.

From this state, the second changeover switch 22 is pressed to be immersed to the 4WD position. As a result, when the code LG and the code LB are conducted, a current flows through the exciting coil 34a of the first relay 34, and the relay contact piece 34a is excited to move to the position shown by the two-dot chain line in FIG. c and the contact d are conducted.

As a result, a current flows through the drive motor 26 in the direction opposite to the above, and the drive motor 26 is rotated in the direction opposite to the above, so that the limit switch 25 is translated upward in FIG. When the limit switch 25 is moved to a position (4WD position) indicated by a dashed line in FIG. 8, the conduction between the conductor 31 and the conductor 29 is cut off, and the excitation coil 34a of the first relay 34 is turned off. When the excitation is released, the drive of the drive motor 26 is stopped.

By driving the drive motor 26, a differential gear (not shown) is operated to switch from the differential lock state to the 4WD state, and the motor 26 is stopped at the 4WD position by the movement of the limit switch 25. The 4WD state is maintained.

In the differential lock state, since the second changeover switch 22 is in the protruding state as described above, the shield 2
3 cannot be moved to the second position, the first switch 21 is covered by the shield 23, only the second switch 22 can be operated, and the switch from the differential lock state to the 4WD state is performed. Since only the operation is possible, the reliability of the operation can be ensured.

When switching from the 4WD state to the 2WD state In the 4WD state, as in the above, both the first and second changeover switches 21 and 22 are in the immersion state (4WD position).
The shield 23 is located at either the first position or the second position. The limit switch 25 of the actuator 24 is located at the position indicated by the one-dot chain line in FIG.
0 and the conductor 29 are in a conductive state.

In this state, if the shield 23 is at the first position, the shield 23 is rotated to the second position. If the shield 23 is at the second position in advance, the state is maintained.
To the 2WD position.

As a result, when the code LG and the code Br are conducted, a current flows through the exciting coil 34a of the first relay 34, and the relay contact piece 34a is excited to rotate as shown by a two-dot chain line in FIG. As a result, the contact c and the contact d are conducted.

As a result, a current flows through the drive motor 26 in the direction opposite to the above, and the drive motor 26 is rotated in the direction opposite to the above, so that the limit switch 25 is translated upward in FIG. And this limit switch 25 is
When the conductor 30 is moved to the position shown by the solid line (2WD position), the conduction between the conductor 30 and the conductor 29 is interrupted, and the first
When the energization of the exciting coil 34a of the relay 34 is released, the drive of the drive motor 26 is stopped.

By driving the drive motor 26, a differential gear (not shown) is operated to switch from the 4WD state to the 2WD state, and the motor 26 is stopped at the 2WD position by the movement of the limit switch 25. The 2WD state will be maintained.

As described above, the first and second changeover switches 2
In addition to providing the shields 23 and 22 and providing the shields 23 for covering them, depending on the position of the shields 23 and the projecting / retracting positions of the first and second changeover switches 21 and 22,
Which state (2WD, 4WD or differential lock state) is at a glance or immediately touched by hand can be immediately identified.

The shield 23 is connected to the first changeover switch 2.
When 1 is switched to the 2WD position, since the movement from the second position to the first position is prevented, 2WD
Only switching between the state and the 4WD state is possible, and
When the second changeover switch 22 is switched to the differential lock position, the movement from the first position to the second position is prevented, so that the differential lock state and the 4WD
Since only switching to the state is possible, it is possible to ensure the reliability of the operation.

Further, first and second changeover switches 21 and
Reference numeral 2 denotes a structure which can be immersed and protruded from the switch base 20, and the shield 23 moves in a direction intersecting the immersion and protruding directions of the switches 21 and 22. When the switches 21 and 22 are in a state of protruding from the switch base 20, the switches 21 and 22 are
The shield 23 is in contact with the side of the
Is configured so as to prevent the movement of the vehicle, the state (2WD, 4WD or the differential lock state) at present can be determined at a glance or immediately by touching with a simple structure. At the same time, it is possible to ensure the reliability of the operation for each state.

Further, the shield 23 is rotatably supported about the axis 23b with respect to the switch base 20, and the direction along the axis 23b and the immersion / projection directions of the switches 21 and 22 are determined. Are set to be substantially the same, and the other end 23c of the shield 23 is swingable, and the other end 23c covers each of the switches 21 and 22.
In addition, since the operating portions of the switches 21 and 22 can be arranged at positions near each other, operability can be improved.

[0045]

As described above, according to the first aspect of the present invention, by providing the first and second changeover switches and providing the shield for covering them, the position of the shield and the position of the shield can be improved. The current state (2WD, 4WD or differential lock state) can be determined at a glance or immediately by touching with the hand by the projecting / retracting position of the first and second changeover switches. Further, when the first changeover switch is switched to the 2WD position, the shield moves to the second position.
Is prevented from moving from the second position to the first position, and only the switching between the 2WD state and the 4WD state is possible.
When the changeover switch is switched to the differential lock position, movement from the first position to the second position is prevented, so that only switching between the differential lock state and the 4WD state is possible. Therefore, the reliability of the operation can be ensured.

According to the second aspect of the present invention, the first and second changeover switches have a structure that can be immersed and protruded from the switch base, and the first and second changeover switches can be immersed and protruded in the direction of immersion and protrusion of each switch. The shield is configured to move in an intersecting direction, and further, when each switch is protruding from the switch base, the shield is prevented from moving by abutting the shield on the side of the switch. With such a configuration, it is possible to determine which state (2WD, 4WD)
(Differential lock state) can be determined at a glance or immediately by touching with hands, and the certainty of operation to each state can be ensured.

According to the third aspect of the present invention, in addition to the above effects, the shield is rotatably supported around the axis with respect to the switch base. The immersion / projection directions of the shield are set to be substantially the same, and the other end of the shield is swingable, and the other end covers each switch. Since it can be arranged in the vicinity, operability can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a four-wheel drive vehicle according to an embodiment of the present invention.

FIG. 2 is a plan view of a handle portion of the four-wheel drive vehicle according to the embodiment.

FIG. 3 is a plan view of the switching device for the four-wheel drive vehicle according to the embodiment.

FIG. 4 is a front view of FIG. 3 according to the embodiment viewed from the direction of arrow A;

FIG. 5 is a diagram showing a state where the shield according to the embodiment is switched to a first position.

FIG. 6 is a partially broken view of the switching device according to the embodiment.

FIG. 7 is a sectional view taken along the line BB of FIG. 4 according to the embodiment;

FIG. 8 is an electric circuit diagram including a drive system switching device for a four-wheel drive vehicle according to the embodiment.

[Explanation of symbols]

 11 Four-wheel drive vehicle 12 Front wheel 13 Rear wheel 14 Engine 15 Handle 16 Grip section 18 Drive system switching device 20 Switch base 21 First switch 22 Second switch 23 Shield 23a One end 23b Shaft core 23c Other end

Claims (3)

[Claims] A first switch that switches between a 4WD state and a 2WD state; a second switch that switches between a differential lock state and a 4WD state; and a second switch that covers the first switch and exposes the second switch. 1 and a shield movable to a second position exposing the first changeover switch and covering the second changeover switch, wherein the shield is configured such that the first changeover switch is in a 2WD position. When the switch is switched to the first position, the movement from the second position to the first position is prevented. When the first switch is switched to the 4WD position, the second position is switched to the first position. And when the second changeover switch is switched to the differential lock position, the movement from the first position to the second position is prevented,
A drive system switching device for a four-wheel drive vehicle, wherein movement from the first position to the second position is permitted when the second switch is switched to the 4WD position. . 2. The first changeover switch and the second changeover switch, wherein each switch is immersed or protruded from a switch base every time a changeover operation is performed, and a direction intersecting the immersion or protruded direction of each switch. When the shield moves, and when each of the switches is protruding from the switch base, the shield contacts the side of the switch so that the shield is prevented from moving. The driving system switching device for a four-wheel drive vehicle according to claim 1, wherein the driving system switching device is configured. 3. An end of the shield is rotatably supported on the switch base about an axis with respect to the switch base, and a direction along the axis and an immersion / projection direction of each switch are defined. The four-wheel drive vehicle according to claim 2, wherein the shield is set to be substantially the same, and the other end of the shield is swingable, and the other end covers each of the switches. Drive system switching device.