JPS5912490B2 - Air control device for power take-off device in automobiles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air control device for a power take-off device in an automobile, which allows the power take-off device to be connected and disconnected safely and reliably.

Recently, power extraction devices such as dump trucks are connected and disconnected using electrical or pneumatic control devices, and the operations are performed using a main operating valve provided in the driver's cab.

However, this main operating valve may be operated carelessly. For example, if only the main operating valve is operated without operating the clutch pedal, it may cause gear noise or gear damage in the power take-off device. Also, even if the main operating valve is operated after operating the clutch pedal, if the vehicle is traveling at a speed of 30 to 60 km/h, the gears of the power take-off device and the gears on the transmission side will not mesh smoothly, causing the above-mentioned problem. This may cause gear noise and gear damage.

In view of the above points, the present invention provides an auxiliary pulp that is switched between an air cylinder and an air tank connected to a shifter part of a power extraction device in conjunction with a main operating valve and a clutch pedal, and further includes an auxiliary pulp that is switched between an air cylinder and an air tank that are connected to a shifter part of a power extraction device, and further includes an auxiliary pulp that is switched in conjunction with a main operation valve and a clutch pedal. By providing an air circuit that connects the solenoid valve in series with a solenoid valve that switches to the open position when the speed is high and switches to the closed position when the speed is higher, gear noise and noise will be avoided even if the main operation valve is operated carelessly This is designed to prevent gear damage.

1 is a power take-off device attached to the transmission of an automobile engine, and the power taken out by this power take-off device 1 is used to
For example, a hydraulic pump is driven and pressure oil generated from the hydraulic pump is sent to a hydraulic cylinder or a hydraulic motor.

2 is an air cylinder connected to the shifter part 3 of the power extraction device 1 and operates the connection/disconnection between the transmission and the power extraction device 1; 4 is an air tank equipped to be used for air brake; A pipe 5 communicating with the air cylinder 2 is attached to the tank 4, and this pipe 5 branches into two directions in the middle, one pipe 6 communicating with the base chamber 7 of the air cylinder 20, and the other pipe 8 communicating with the base chamber 7 of the air cylinder 20. It communicates with the tip chamber 9 of the air cylinder 2.

A main operating pulp 11 and a clutch pedal 12 are provided in the middle of the piping 6 so as to be able to be switched within the driver's cab 10.
An auxiliary pulp 13 that switches in conjunction with the switch and connects or closes the piping 6, and a solenoid pulp 15 that is energized and switched by connecting or disconnecting a speed detection switch 14, which will be described later, and connects or closes the piping 6, respectively. It has been intervened.

The speed detection switch 14 is activated when the traveling speed of the automobile is approximately 20
It is connected at speeds below km/h and disconnected at speeds higher than that, and is interposed in the middle of the wiring 17 that connects the battery 16 and the solenoid pulp 15.

In addition, 18 is a safety valve provided at the connection part where the piping 5 is connected to the air tank 4, and when the air pressure in the air tank 4 falls below a certain level, the air in the tank 4 flows into the air cylinder 2.
This prevents the air from flowing to the side and gives priority to the air brake side.

The present invention has the above configuration, and in the state shown in FIGS. 1 and 2, the inside of the base chamber 7 of the air cylinder 20 is open to the atmosphere, and the inside of the tip chamber 9 of the air cylinder 2 is connected to piping. 8 is in constant communication and at high pressure, air pressure acts only on the upper surface of the piston, retracting the air cylinder 2 and cutting off power transmission between the transmission and the power extraction device 1.

Next, when bringing the power take-off device 1 into contact, first switch the main operation valve 11 to the communicating position, then switch the auxiliary pulp 13, which is switched in conjunction with the clutch pedal 12, to the communicating position, and the vehicle will stop. When the vehicle is running at low speed or when the vehicle is running at low speed, the speed detection switch 14 is turned off, cutting off the power to the solenoid pulp 15 and switching the solenoid pulp 15 to the open position, so that the air in the air tank 4 is The air flows into the base chamber 7 of the air cylinder 20 through the main operation valve 11, the auxiliary pulp 13, and the solenoid pulp 15, which are installed in the pipe 6.

Therefore, air pressure acts on the lower and upper surfaces of the piston, but since the pressure receiving area on the lower surface of the piston is larger than the pressure receiving area on the upper surface, the air cylinder 2 expands, and due to the operation of the air cylinder 2, The shifter section 3 is operated and the power take-off device 1 is brought into contact.

Incidentally, when the automobile is traveling at a speed of 20 km/h or more, even if the main operation valve 11 and the auxiliary valve 13 are switched to the communicating position, the speed detection switch 14 is closed and the solenoid pulp 15 is not energized. However, since the solenoid pulp 15 is switched to the closed position and operated, the air cylinder 2 is operated and the shifter section 3 of the power extraction device 1 is not operated.

As described above, the present invention provides an auxiliary valve, which is switched in conjunction with the clutch pedal, in addition to the main operating valve, in the middle of the piping that connects the air cylinder that operates the shifter part of the power extraction device and the air tank. By providing a solenoid pulp that switches between below and above a certain level, the power take-off device can be connected and disconnected reliably, and even if the main operation valve is carelessly operated as in the past, The air cylinder operates without causing gear noise or gear damage.

[Brief explanation of drawings]

1 and 2 are diagrams showing the apparatus of the present invention. 1 is a power take-off device, 2 is an air cylinder, 4 is an air tank, 5 is piping, 11 is a main operation valve, 12 is a clutch pedal, 13 is an auxiliary pulp, and 15 is a solenoid pulp.

Claims (1)

[Claims] 1. A main operation valve is installed in the piping that connects the air tank and the air cylinder connected to the power extraction device, and air pressure flows into and out of the air cylinder by switching the main operation valve to connect the power extraction device. , an air control device capable of disconnecting the air, including an auxiliary valve in the middle of the piping that switches between an open position and a closed position in conjunction with a clutch pedal, and when the speed of the vehicle is below a certain level and when the speed is above a certain level. An air control device for a power take-off device in an automobile, comprising a speed detection switch that is connected or disconnected by a speed detection switch, and a solenoid pulp that is switched to a communicating position or a closed position by connecting or disconnecting the speed detection switch. .