JPS6219455Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a part-time type 4 that normally drives two wheels using either the front or rear wheels, and when necessary, runs in four-wheel drive by operating a switch. The present invention relates to a four-wheel drive switching display device for checking the actual switching operation of a four-wheel drive switching operation using a switch in a wheel drive vehicle.

[Prior art and problems] As such a part-time four-wheel drive vehicle, a solenoid valve is operated by operating a switch on the driver's seat and a transfer clutch in the transmission system is engaged, thereby electrically driving four-wheel drive. The applicant has already proposed a method of switching to . By the way, in this case, it is necessary to inform the driver of the operating state of the switch, that is, the switching state of 2-wheel drive or 4-wheel drive, by lighting a pilot lamp or the like. It is now used to display information using pilot lamps.

By the way, since such display means only displays whether or not the 2- and 4-wheel drive changeover switch has been operated, an abnormality such as a disconnection may occur in the 4-wheel drive electric circuit that includes the switch, and the 4-wheel drive changeover switch may actually be switched off. Even if the drive is not switched to normal mode, the pilot lamp lights up to indicate that the switch is normal. As a result, the driver may be slow to notice such an abnormality, leading to problems such as a situation where the four-wheel drive vehicle is driven without achieving its original performance. In order to eliminate this inconvenience, it is conceivable to add a separate means to detect and display the actual four-wheel drive switching state in addition to the above-mentioned display based on only the switch operation, but this would complicate the display means. , the driver may end up making a mistake. Here, abnormalities in the four-wheel drive switching operation are very rarely caused by mechanical parts such as the transfer clutch, and are most likely caused by disconnection of the electric circuit including the switch and solenoid valve due to vibration, etc. For this reason, it is actually more effective to check the status of electrical circuits such as switches.

In addition, since the driver always drives while looking ahead, the pilot lamp on the instrument panel alone does not allow the driver to immediately confirm when switching between 2-wheel drive and 4-wheel drive. hard. Therefore, it is impossible to detect erroneous operations, especially when a switch is touched by mistake, and in this respect as well, it is insufficient as a display means.

As a prior art, there is Japanese Patent Application Laid-Open No. 15019/1983.

In view of these circumstances, the present invention prevents erroneous display in the event of an abnormality such as a break in the electric circuit of the 2- and 4-wheel drive selector switch, and also provides a system for drivers who constantly look ahead while driving. On the other hand, the 4-wheel drive vehicle's 4-wheel-drive vehicle has a system that not only makes it easy to confirm by immediately informing the user of the switch operation, but also prevents erroneous operation.
An object of the present invention is to provide a wheel drive switching display device.

[Means for Solving the Problems] For this purpose, the device according to the present invention is provided with a reed switch in an electric circuit having a 2- and 4-wheel drive changeover switch and a solenoid valve. The switching operation state is detected and displayed, and a predetermined oscillation sound is emitted at the time of switching so that it can be immediately confirmed audibly.

[Example] Hereinafter, an example of the present invention will be specifically described with reference to the drawings. First, in the drawings, 4 according to the present invention is shown.
To explain the transmission system of a wheel drive vehicle, there are two types of FF.
It is based on wheel drive, where 1 is the engine crankshaft, 2 is the clutch, 3 is the input shaft,
4 is a manual transmission. The transmission 4 is of a constant mesh type, with an output shaft 5 installed parallel to the input shaft 3, and four sets of gears for shifting from 1st speed to 4th speed on both shafts 3 and 5. 6 to 9 are provided, and each gear change is performed by selecting these gears 6 to 9 via two sets of synchronizing mechanisms 10 and 11 by operating a change lever. Also, one synchronizing mechanism 10 is connected to the reverse gear 12 provided on the input shaft 3.
Reverse speed is obtained by meshing the gear 13 on the sleeve side with an idler gear (not shown).

In addition, an input shaft 3 between the clutch 2 and the transmission 4
A front wheel final reduction device 14 is disposed at the bottom, and one drive pinion 16 of the output shaft 5 meshes with the crown gear 15 of this device 14.
Wheel drive is provided.

The side of the output shaft 5 of the transmission 4 opposite to the drive pinion 16 extends rearward;
A transfer device 17 is attached to the rear of the
The output shaft 5 and the rear drive shaft 20 are configured to be transmitted by the transfer drive and driven gears 18 and 19 of this device 17. Here, the gear 18 is integrally connected to the output shaft 5, while the gear 19 is rotatably fitted to the rear drive shaft 20, and these gears 19 and the rear drive shaft 20 are connected to the hydraulic pressure for switching between 2 and 4 wheel drive. The rear drive shaft 20 is connected by a clutch type transfer clutch 21, and the rear drive shaft 20 is further connected to the propeller shaft 2.
2 to the rear wheel final reduction gear 23.

Oil pump 2 is attached to transfer clutch 21.
A hydraulic circuit is constructed from 4 through a solenoid valve 26 in an oil passage 25, and this valve 26 connects the clutch 21 side of the oil passage 25 to the drain port 28 to drain oil when the solenoid 27 is de-energized as shown in the figure. When the solenoid 27 is energized, the plunger 29
the spool 30 through the return spring 31
By moving against the
Close the oil passage 25 and open the clutch 21.
It is configured to refuel the A two- and four-wheel drive selector switch 32, an ignition switch 33, and a battery 34 on the driver's seat side are electrically connected to the solenoid 27 of the solenoid valve 26 in series.

In this configuration, according to the present invention, the coil 35a of the reed switch 35 is connected to an electric circuit including the switch 32 and the solenoid 27, and one of its contacts 35b is connected to the battery 34 side. On the other hand, the other contact 35b is connected to a tone indicator 37 as well as a pilot lamp 36 on the instrument panel. This tone indicator 37
The device includes a ringing time setting circuit 38 and an oscillation circuit 39, and a predetermined oscillation sound is emitted from the speaker 40 for a certain period of time using a signal generated by the ringing time setting circuit 38 and an oscillation circuit 39.

With this configuration, when the 2- and 4-wheel drive switching switch 32 is turned off, the solenoid 27 of the solenoid valve 26 is de-energized, causing the transfer clutch 21 to drain oil and become released. Therefore, the power taken out to the output shaft 5 of the transmission 4 is not transmitted to the rear wheels but is transferred to the front final reduction gear 1.
The power is transmitted only to the front wheels via the front wheels, and two-wheel drive driving using the front wheels is thus performed. In this case, the coil 35a of the reed switch 35 is also demagnetized and its contact 35b is turned off, so that the speaker 4
0 does not sound and the pilot lamp 36 is also off.

On the other hand, when the switch 32 is turned on to change to four-wheel drive, if the electric circuit is normal, the solenoid 27 of the solenoid valve 26 is energized to supply oil to the transfer clutch 21; is engaged, and the power from the output shaft 5 of the transmission 4 is transmitted to the rear wheels via the clutch 21 and the rear wheel final reduction gear 23. In this way, four-wheel drive driving using the front and rear wheels is possible. It will be done. And at this time, solenoid valve 2
Coil 3 of reed switch 35 when energizing 6
5a is also excited by energization to turn on contact 35b. Then, the tone indicator 37 is energized, and its circuits 38 and 39 generate an oscillating sound of, for example, 80 m/sec, 2 KHz from the speaker 40, and at the same time, the pilot lamp 36 continues to light up due to the energization during this four-wheel drive. .

However, if the solenoid valve 26 does not switch due to a break in the electric circuit or the like when operating the switch 32, the transfer clutch 21 will also be drained of oil and will remain in two-wheel drive mode, and will actually be in four-wheel drive mode. It has not switched to drive. At this time, the reed switch 35 is also inactive, the speaker 40 does not sound, and the pilot lamp 36 also does not light up, so that the driver can immediately notice this abnormality.

[Effects of the invention] As is clear from the above explanation, according to the invention, the actual four-wheel drive switching state resulting from the operation is detected and displayed, rather than the operation itself of the two-wheel drive/four-wheel drive switching switch 32. , it is possible to prevent erroneous display in the event of an abnormality such as a wire breakage. In addition, the pilot lamp 36 is used as a display means to enable arbitrary confirmation, and in addition to this, the speaker 40 generates an oscillating sound, so that it can be audibly confirmed when the switching operation is normal. This makes it possible to reliably notify drivers who are constantly looking ahead. Furthermore, since the driver can be immediately notified of the switching operation in this way, erroneous operations can be prevented and reliability and safety can be improved.

[Brief explanation of drawings]

The drawing is a configuration diagram showing one embodiment of the device of the present invention. 4...Transmission, 14...Front wheel final reduction gear, 21
... Transfer clutch, 23 ... Rear wheel final reduction gear, 26 ... Solenoid valve, 32 ... 2,
4-wheel drive switching switch, 35... Reed switch, 36... Pilot lamp, 37... Tone indicator, 38... Sounding time setting circuit, 39
...Oscillation circuit, 40...Speaker.

Claims (1)

[Scope of utility model registration request] The power is transmitted directly to one of the front and rear wheels, and if necessary, the power is transmitted to the other of the front and rear wheels by engaging a transfer clutch. In a four-wheel drive vehicle in which the transfer clutch is engaged by operating a solenoid valve by operating a changeover switch, the above-mentioned 2.
A reed switch is provided in the electric circuit having the four-wheel drive switching switch and the solenoid valve to detect whether or not the solenoid valve is energized, and the operation of the reed switch generates a predetermined oscillating sound during the four-wheel drive switching operation. A four-wheel drive switching display device for a four-wheel drive vehicle, characterized in that it is configured as follows.