JPH0112984Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a display device for a four-wheel drive vehicle that displays the state of transmission of driving force of the four-wheel drive vehicle.

(Prior Art) In a four-wheel drive vehicle, engine output, which has been switched to an appropriate gear position by a transmission, is distributed and transmitted to the front and rear wheels by a front and rear wheel switching mechanism. When the vehicle is in two-wheel drive, the wheel on the side to which no driving force is applied is not restrained to prevent unnecessary consumption of driving force. This mechanism is commonly called a freewheel mechanism. When driving in two-wheel drive, it is desirable to leave the freewheel mechanism in the unlocked state so that the wheels can rotate freely, but sometimes the freewheel mechanism is left in the locked state when driving in two-wheel drive, causing unnecessary parts to rotate. This may worsen fuel efficiency.

(Objective of the invention) An object of the present invention is to provide a device that displays the transmission state of driving force, in order to solve the problems of the above-mentioned prior art.

(Structure of the invention) In order to achieve the above object, the present invention is a four-wheel drive vehicle equipped with a freewheel mechanism on the wheel on the side to which driving force is not applied during two-wheel drive. A sub-transmission that switches and transmits the rotational output of the transmission to the front and rear wheels is provided with a gear that rotates together with the front wheels and rear wheels that rotate when the sub-transmission is switched, and that is opposed to each of the rotating gears. Sensors are provided at each position and at a position facing the switching shaft, and the state of transmission of the driving force is displayed based on detection signals from the plurality of sensors. This allows you to instantly know the status by looking at the display, making it possible to prevent erroneous operations.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. First, in FIG. 1, 1 is an engine, 2 is a transmission, and 3 is an auxiliary transmission. The output of the engine 1 is shifted to an appropriate gear by the transmission 2, and is transmitted via the auxiliary transmission 3 to the front and rear final reduction gears 6, 7 by propulsion shafts 4, 5. 8 is the front wheel, 9
is a rear wheel, and a freewheel mechanism 11 is provided on a drive shaft 10 that connects the front wheel 8 and the final reduction gear 6. 12 is the output shaft 13 of the sub-transmission 3 and the propulsion shaft 4
It is a flange that connects the

FIG. 2 shows details of the main parts in FIG. 1. In this figure, 14 is the rear wheel drive shaft,
It is supported by a bearing 15, receives rotational force from a portion not shown, and is connected at the right end to a rear wheel propulsion shaft 5 (see FIG. 1). At the left end of the rear wheel drive shaft 14 in the figure, an output shaft 13 is supported by bearings 16 and 17 and is provided on the same axis, and is connected to the front wheel propulsion shaft 4 by the flange 12 as described above. .

A clutch hub 18 is attached to the end of the rear wheel drive shaft 14, and a sleeve 19 meshes with a dog 18a on the outer periphery of the clutch hub 18. On the other hand, the output shaft 13
A dog 13a is also provided on the sleeve 19.
When the two move to the left and engage with each other, they rotate together with the rear wheel drive shaft 14. Sleeve 19
The tip of the fork 20 fits into the groove 19a. The fork 20 is attached at its base by a shaft 21 to a switching shaft 22.

A gear 23 for rotation detection is provided on one side of the sleeve 19.
is provided, and a first sensor 24 is provided opposite thereto. This first sensor 24
is from the rotating or stopped state of the gear 23 to the rear wheel 9
This is to detect the state of. On the other hand, the output shaft 13
A gear 25 for detecting rotation is also provided, and a second sensor 26 is provided opposite to this gear. This second sensor 26 detects the state of the front wheel 8. A third sensor 27 is provided opposite the switching shaft 22 to detect movement of the switching shaft 22, that is, whether or not the front wheels 8 are in a driving state.

Next, the operation of the apparatus described above will be explained. In the state shown in FIG. 2, the sleeve 19 is attached to the output shaft 13.
Since it does not mesh with the side dog 13a, there is no driving force transmitted from the rear wheel drive shaft 14 to the front wheel 8 side. Therefore, if the freewheel mechanism 11 of the front wheel 8 is in a locked state, the output shaft 13 is driven from the front wheel 8 side and rotates, and if the freewheel mechanism 11 is released, it is in a non-rotating state. These conditions are
It is detected by the second sensor 26. The first sensor 24 detects the rotation status of the sleeve 19, that is, the rotation and stop status of the rear wheel drive shaft 14, and the third sensor 27 detects the status of the sleeve 19.

From the combination of the output signals of the three sensors 24, 26, and 27, it is possible to distinguish between locking and unlocking of the freewheel mechanism 11 during two-wheel drive driving, and between these and four-wheel drive driving. These are arranged by a control circuit (not shown) and displayed by lamps on an instrument panel or the like. Note that among the three modes described above, the state when the freewheel mechanism 11 is released in two-wheel drive driving does not necessarily have to be displayed.

(Effects of the invention) Since the present invention is configured as explained above, the driver can accurately grasp the power transmission situation and the freewheel mechanism situation.
There is an advantage that the freewheel mechanism is locked during two-wheel drive driving, thereby eliminating wasteful fuel consumption.

By installing sensors to obtain this kind of operation in a position facing the gear inside the auxiliary transmission and a position facing the switching shaft, it is possible to accurately detect the rotation of the front and rear wheels. A display device that is reliable and free from malfunctions can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the drive mechanism of an automobile to which the present invention is applied, and FIG. 2 is a cross-sectional view showing the main parts of FIG. 1 in detail. 8...front wheel, 9...rear wheel, 24...first sensor, 26...second sensor, 27...third sensor.

Claims (1)

[Scope of utility model registration request] In a four-wheel drive vehicle equipped with a freewheel mechanism on the wheel on the side to which no driving force is applied during two-wheel drive, a sub-transmission that is connected to a transmission and switches and transmits the rotational output of the transmission to the front and rear wheels, A gear is provided that rotates together with the front wheels and rear wheels that rotate when the sub-transmission is switched, and a sensor is provided at a position facing each of the rotating gears and a position facing the switching shaft, and the plurality of 1. A display device for a four-wheel drive vehicle, characterized in that the display device is configured to display a transmission state of driving force based on a detection signal from a sensor.