JPH0452530Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a power extraction device for a mechanical automatic transmission of an automobile or the like.

<Prior art> In an automobile transmission, a clutch is disengaged and engaged by an actuator such as a hydraulic or pneumatic cylinder controlled by a computer that inputs select lever position, accelerator, vehicle speed, engine rotation signal, etc.
Mechanical automatic transmissions in which gears are changed are known.

Furthermore, in the case of work vehicles such as mixer trucks and pump trucks that are driven by an engine, it is also known to drive the mixer or pump from a countershaft of a transmission via a power extraction mechanism.

<Problem that the invention seeks to solve> A mechanical manual transmission equipped with a power take-off mechanism has a mechanism in which the clutch is engaged when the gear position is set to neutral and the foot is released from the clutch pedal. With a mechanical automatic transmission, the engine rotation is transmitted from the input shaft to the countershaft, making it possible to extract power. However, with a mechanical automatic transmission, when the gear position is set to neutral, the clutch is automatically operated to the disengaged state. , engine rotation is not transmitted to the countershaft. Therefore, it has not been possible to use a power take-off device in conventional mechanical automatic transmissions.

<Means for solving the problem> The present invention enables the use of a power take-off device even in a mechanical automatic transmission when the transmission gear is in a neutral state, and its configuration is such that a hydraulic or pneumatic cylinder is used. A clutch that is connected and disconnected by an actuator such as a clutch, a clutch control valve that controls the actuator in response to a command signal such as a gear shift, and a shift and select unit that uses hydraulic or pneumatic pressure that is controlled in response to a shift command signal to change gears. A mechanical automatic transmission comprising a transmission gear section, a power extraction mechanism output from a countershaft of the transmission gear section, and a clutch control valve controlled at a neutral gear position of the transmission gear section to disengage the clutch. , and a manually operated clutch switch.

<Operation> The present invention extracts power from the countershaft by operating the clutch switch in the neutral gear position and connecting the clutch.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, reference numeral 1 denotes a mechanical automatic transmission, which includes a clutch 2 which is engaged and disconnected by a hydraulic or pneumatic cylinder, and a transmission gear part which is shifted by hydraulic or pneumatic pressure and gears are changed by a select unit 5. It is composed of 3 and 3. 4 indicates a clutch control valve.

These operations of the clutch 2 and transmission gear section 3 are as follows:
It is controlled by a computer 6. In addition to the signal from the select lever 7, signals such as the accelerator, vehicle speed, and engine rotation are input to the computer 6. Reference numeral 8 denotes a gear position indicator, which displays the gear position from a gear position sensor 12 provided in the shift/select unit 5 via the computer 6. 1
A clutch sensor 3 detects whether the clutch 2 is in a disengaged or engaged state.

In the present invention, the transmission gear section 3 is provided with a power extraction mechanism 9 for extracting engine rotation from the countershaft. As is well known, this power take-off mechanism is provided with a dog clutch between the countershaft and the output shaft, and is controlled by opening and closing the dog clutch. The on/off operation of the dog clutch is performed by manually operating the operating lever 10 as shown in FIG.
4, and is automatically turned on by air or vacuum cylinder. In this case, a sensor 16 is provided in the power extraction mechanism 9, and an indicator lamp 17 indicates the power extraction state. Although not shown, the dog clutch can also be turned on and off using an electric actuator such as a solenoid controlled by an electric switch.

Furthermore, as shown in FIGS. 1 and 2, the present invention is provided with a clutch switch 11 for the power take-off mechanism which disconnects and engages the clutch at the neutral gear position, and is electrically connected to the computer 6.

The invention works as follows. First, the selector lever 7 is placed in neutral to set the gear position of the transmission gear section 3 in neutral, and this is confirmed on the gear position indicator 8. At this time, the clutch 2 is in the disengaged state. Next, the power take-off device is used by operating the operating lever 10 to engage the dog clutch of the power take-off mechanism 9, turning on the clutch switch 11, and connecting the clutch 2. In the case of FIG. 2, by turning on the clutch switch 11, an opening signal is sent from the computer 6 to the solenoid valve 15, and the power take-off mechanism 9 is
The dog clutch is automatically connected and power is extracted.

<Effects of the invention> As described above, according to the invention, by providing a clutch switch that disconnects and engages the clutch at the neutral gear position, engine power is extracted from the countershaft of the mechanical automatic transmission via the power extraction mechanism. This makes it possible to apply mechanical automatic transmissions to work vehicles such as mixer trucks and pump trucks.

[Brief explanation of drawings]

FIGS. 1 and 2 are configuration diagrams showing an embodiment of the present invention. 1... Mechanical automatic transmission, 2... Clutch, 3
...Transmission gear section, 4...Clutch control valve, 5...Shift, select unit, 6...
Computer, 7... Select lever, 9... Power take-off mechanism, 11... Clutch switch.

Claims (1)

[Scope of utility model registration request] A clutch that is disengaged or engaged by an actuator such as a hydraulic or pneumatic cylinder, a clutch control valve that controls the actuator in response to a command signal such as a gear shift, and a shift or select that is controlled by hydraulic or pneumatic pressure in response to a shift command signal. In a mechanical automatic transmission, the clutch control valve is controlled by a power take-off mechanism outputted from a counter shaft of the transmission gear and a neutral gear position of the transmission gear, in a mechanical automatic transmission comprising a transmission gear that changes gears by a unit. A power take-off device for a mechanical automatic transmission, characterized in that it is equipped with a manual clutch switch that disengages and engages a clutch.