JPS5928908Y2 - Transfer control device for all-wheel drive vehicles - Google Patents

Description

[Detailed Description of the Invention] For all-wheel drive vehicles, a transfer control device has been developed that allows selection of high and low, rear wheel drive, and all wheel drive to be performed with a single operation.

This includes one that performs the above two Q selections using a purely mechanical interlocking system, and...A.

Low selection is done mechanically, and rear-wheel drive and all-wheel drive selection is made using an air cylinder.

The latter has the advantage of requiring less operating force than the former, but on the other hand, a mechanical system and an air cylinder operating system coexist, and depending on the phase relationship between the teeth to be meshed, Since there is a delay in the operation of the air cylinder side, the condition that the all-wheel drive state is always established in the low state may not be met.

The purpose of this proposal is to easily avoid the above-mentioned inconveniences that occur when a mechanical operation system and an air cylinder operation system are combined. .

In the figure, reference numeral 1 denotes a transfer control lever. When moved to the H side, the clutch sleeve 3 is powered to the left via the control rod 2 to select high (high speed), and the transfer control lever 2 is moved to the L side.
Power and pull the clutch sleeve 3 to the right through the
low speed).

4U) An air cylinder that restricts the operation of the transfer control lever 1 to the low side, 5 (/i Tank as a compressed air source, 6 a flow path between the working chamber of the air cylinder 4 and the tank 5, 7 is a solenoid valve provided on the flow path 6.

When the energization of the electromagnetic valve 7 is stopped, the operating chamber of the air cylinder 4 is changed from communicating with the tank 5 to being open to the atmosphere, thereby rendering the air cylinder 4 inactive.

The reason why the air cylinder 4 restricts the operation of the transfer control lever 1 toward the low side is due to the step provided on the control rod 2, and this step restricts the operation toward the high side. Do not add.

On the operating circuit of the electromagnetic valve 7, a switch 11 is provided which closes when the piston rod 9 of the air cylinder 8, which engages and engages the front drive clutch, reaches the end of the stroke which causes the clutch sleeve 10 to move in the disengagement direction. It will be done.

12 (/'i Working chamber 13 of tank 5 and air cylinder 8
A solenoid valve 15I/i provided on the flow path 14 connecting the
This is a switch on the operating circuit of the solenoid valve 12.

The switch 15 closes at the beginning of a stroke to move the transfer control lever 1 from the neutral position to the low direction, and opens at a position close to the neutral position when the transfer control lever 1 is returned from the low position to the neutral position.

A switch 11 that closes when the piston rod 9 of the air cylinder 8 that connects and disconnects the front drive clutch reaches the end of the stroke in the forward direction, and a solenoid valve 7 provided on the operating circuit to connect this switch. When the valve 7 is energized, the air cylinder 4 loses its ability to restrict the operation of the transfer control lever 1 in one direction. It provides a clear difference between the time when the front drive clutch is selected and the time when the front drive clutch is reliably engaged, and works to prevent the former from preceding the latter.

This action is achieved by the provision of an air cylinder 4 that restricts the movement of the transfer control lever 1 in one direction, and the restriction of this air cylinder 4 ensures that the front drive clutch is engaged. This is due to the fact that it has to be released after waiting.

In most cases, the time required for the front drive gear to shift to the meshed state is extremely short and short, so the resistance given by the air cylinder 4 when operating the transfer control lever to the low side is practically a problem. Not.

As explained in the explanation of the soil, the device according to the present invention uses an air cylinder to select between rear-wheel drive and all-wheel drive, and the front drive must always be engaged in the low state. This completely protects the rear gear.

[Brief explanation of the drawing]

The figure is a diagram showing the configuration of a transfer control device according to the present invention. 1...Transfer control lever, 2...
... Control Rondo, 3 ... Clutch sleeve for selecting low and high, 4 ... Air cylinder that restricts the movement of the transfer control lever in one direction, 5 ...Tank, 6.
...Flow path, 7...Restriction release solenoid valve for transfer control lever, 8...
・Front drive intermittent air cylinder, 9...
...Front drive clutch clutch sleeve, 11...Front drive Q pile state detection switch, 12...Front drive solenoid valve,
13... Working chamber of air cylinder 8, 14...
...Flow path, 15...Switch for operating the solenoid valve 12.

Claims (1)

[Scope of utility model registration request] Purely mechanical shifting between high and low, all-wheel drive,
In a type in which rear wheel drive is switched by a power shift operation using an air cylinder, among the movements given to the transfer control lever 1,
An air cylinder 4 that prevents the stroke reaching the low selection position in the middle of the stroke, and a solenoid valve that deactivates the air cylinder 4 so that the transfer control lever can reach the low selection position. 7 and 1. A switch 11 that closes when the piston rod 9 of the air cylinder 8 that connects and disconnects the front drive clutch reaches the end of the stroke in the forward direction is provided on the operating circuit of the solenoid valve 7. Transfer control device for wheel drive vehicles.