JPS6349523A - Speed change gear equipped with power taking-out device - Google Patents

Abstract

PURPOSE:To prevent the generation of breakage and impact noise when each gear is in engagement by permitting a driving side gear and a trailing side gear to be meshed only in the case when the revolution speed of the driving side gear in a power taking-out device is below a prescribed value. CONSTITUTION:The driving power of an engine 10 is transmitted to a turbine shaft 14 through a torque converter 12, and further transmitted to an output shaft 18 through a speed change mechanism 16. If, in this case, the revolution speed of a driving side gear 20 which is input from a revolution speed detector 18 is below a prescribed value, a controller 36 outputs a signal for turning-ON a solenoid valve 34 only in the case when a power taking-out device operating switch 40 is turned ON. Therefore, when the driving side gear 20 revolves at the higher speed over a prescribed value, the solenoid valve 23 is kept in the turned-OFF state even if the operation switch 40 is turned ON. Therefore, an oil pressure is supplied into the oil chamber 32 of a hydraulic cylinder 26, and since a trailing side gear 22 is at the disengagement position with the driving side gear 20, a prescribed purpose can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a transmission with a power take-off device.

(b) Conventional technology For transmissions of automobiles or industrial vehicles, for example,
As shown in Japanese Patent No. 184024, some are equipped with a power take-off device. The power extraction device extracts a portion of the driving force of the engine and uses it for purposes other than propulsion of the vehicle.

A power extraction device generally has a drive side gear provided on a member driven by the engine and a driven side gear that can mesh with the drive side gear, and is configured so that the rotation of the driven side gear is extracted to the outside and used. Ru. When power extraction is not required, the engagement between the drive side gear and the driven side gear is released.

(c) Problems to be solved by the invention However, in the case of a conventional transmission with a power take-off device,
For example, by operating a lever, it is possible to always move the driven gear to the meshing position.
If you operate the lever to move the driven gear when the engine speed is high, such as when the engine is running, fast idling, or idling, a loud gear meshing noise may be generated, or the gear may be damaged. There is a problem that this problem occurs. The present invention aims to solve these problems.

(d) Means for Solving the Problems The present invention solves the above problems by enabling the driving gear and the driven gear to mesh only when the rotational speed of the driving gear of the power take-off device is low. Solve. That is,
The transmission with a power take-off device according to the present invention includes a rotation speed detector (3) that detects the rotation speed of the drive side gear (20) of the power take-off device.
8), and the drive side gear and driven side gear (22) of the power take-off device.
); and an actuator (26) that can switch between enabling and blocking power transmission between the actuator (26) and the actuator that can transmit power only when the rotational speed detected by the rotational speed detector is below a predetermined value. It has a control device (36) that allows the output of a signal to operate to the side. In addition,
The symbols in parentheses are the symbols of corresponding members in the embodiments described later.

(E) When the rotational speed of the driving gear of the working power extraction device is higher than a predetermined value, the control device outputs a signal that operates the actuator to the power extraction side, that is, the driven gear is changed to the driving gear. Preventing interlocking and enabling power transmission.

On the other hand, if the rotational speed of the drive side gear is below a predetermined value,
The control device allows a signal to be output that causes the driven gear to mesh with the driving gear. This makes it possible to take out the output from the power take-off device. Therefore, the operation of meshing the driven gear with the driving gear in a high-speed rotation state is not performed, and it is possible to prevent impact noise and damage to the gear.

(F) Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIG. 1 of the accompanying drawings.

The driving force of the engine 10 is transmitted to the turbine $1114 via the torque converter 12, and the rotation of the turbine shaft 14 is changed in speed by the planetary gear type transmission mechanism 16.
8. The output shaft 18 is connected to wheels via a differential gear (not shown). The turbine shaft 14 is provided with a driving gear 20 that rotates integrally therewith. A driven gear 22 that can mesh with the driving gear 20
is provided, and this driven gear 22 is connected to the power take-off shaft 2.
4, but are connected to each other by, for example, a spline so as to be movable in the axial direction. Power take-off shaft 2
4 is rotatably supported with respect to the casing. The driven gear 22 is connected to a piston 28 of a hydraulic cylinder 26 (actuator) that moves the driven gear 22 in the axial direction. When hydraulic pressure is applied to the oil chamber 30 side, the piston 28 moves to the left in FIG. When actuated, it moves rightward in FIG. 1 and moves the driven gear 22 to a position where it does not mesh with the driving gear 20. The oil pressure in the oil chambers 30 and 32 is controlled by a solenoid valve 34. The solenoid valve 34 supplies hydraulic pressure to the oil chamber 30 when it is on, and supplies hydraulic pressure to the oil chamber 32 when it is off.

The on/off state of the solenoid valve 34 is controlled by a signal from a control device 36. A signal from a rotation speed detector 38 that detects the rotation speed of the turbine axle load 4, that is, the rotation speed of the drive side gear 20, is manually input to the control device 36. Also,
A signal from a power extraction device operation switch 40 operated by the driver is also input to the control device 36.

Next, the operation of this embodiment will be explained. Control device 36
The electromagnetic circuit is activated only when the power take-off device operation switch 40 is turned on and the signal input from the rotation speed detector 38 indicates that the rotation speed of the drive side gear 20 is below a predetermined value. It is configured to output a signal that turns on the valve 34. Therefore, when the drive side gear 20 is rotating at a higher speed than a predetermined value, the solenoid valve 34 remains off even if the power take-off device operation switch 40 is turned on, and the oil pressure remains in the oil chamber 32 of the hydraulic cylinder 26. The driven gear 22 is in a non-meshing position with the driving gear 20. Therefore, when the driving gear 20 is rotating at high speed, the driven gear 22 cannot be moved to the meshing position. As a result, the driving side gear 20 and the driven side gear 22
Accidents such as damage to gears, or the occurrence of impact noise due to meshing of gears, etc., are prevented.

When the power take-off device operation switch 40 is turned on when the rotational speed of the drive side gear 20 is below a predetermined value, the control device 36
outputs a signal to the solenoid valve 34 to turn it on. Therefore, hydraulic pressure is supplied to the oil chamber 30 side of the hydraulic cylinder 26,
The driven gear 22 moves to a meshing position with the driving gear 20 as shown in FIG. As a result, the turbine shaft 1
A part of the rotational force of No. 4 is transmitted to the driving gear 20 and the driven gear 22.
is transmitted to the power take-off @24 via.

Therefore, a portion of the rotational force of the engine 10 can be extracted from the power extraction shaft 24, and thereby other devices such as a winch, a hydraulic pump, etc. can be driven. Note that once the driven gear 22 moves to the meshing position, the solenoid valve 34 is kept in the on state until the power take-off device operation switch 40 is turned off (that is, the driving gear 22 is moved to the meshing position).
Even if the rotational speed of 0 becomes higher than a predetermined value, the on state of the solenoid valve 34 is maintained).

In this embodiment, when the rotational speed of the drive side gear 20 is below a predetermined value, the solenoid valve 34 is not switched even if the power take-off device operation switch 40 is operated. If the rotation speed is below a predetermined value, the driver is informed that it is possible to operate the power take-off device by, for example, lighting a lamp on the driver's seat, and only in this case can the driver press the power take-off device operation switch. 40, and the solenoid valve 34 may be turned on immediately when the power take-off device operation switch 40 is operated. Further, in this embodiment, the hydraulic cylinder 26 is used as the drive source for moving the driven gear 22, but other actuators such as a combination of a motor and a screw mechanism may also be used.

(G) As described in detail, according to the present invention, the driving gear and the driven gear can be engaged only when the rotational speed of the driving gear of the power take-off device is below a predetermined value. It is possible to prevent the occurrence of problems such as damage to gears and the occurrence of thieves.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a transmission with a power take-off device according to the present invention. 20... Drive side gear, 22... Driven side gear, 26.
... Hydraulic cylinder (actuator), 36 ... Control device, 38 ... Rotation speed detector.

Claims (1)

[Claims] 1. A rotational speed detector that detects the rotational speed of the driving gear of the power extraction device, and a state that enables power transmission between the driving gear and the driven gear of the power extraction device. and a control device that allows output of a signal that operates the actuator to enable power transmission only when the rotational speed detected by the rotational speed detector is less than or equal to a predetermined value. A transmission with a power take-off device characterized by: 2. Claim 1, wherein the actuator is configured to operate to enable power transmission when the power take-off device operation switch is turned on in a state where the control device allows the output of the signal. Transmission with power take-off device. 3. When the control device is in a state that allows the output of the signal, a device for notifying the driver that the power take-off device can be operated is configured to operate. Transmission with power take-off device.