JPH0958286A - Power takeoff device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items by incorporating a single coil into an electromagnetic actuator, mounting at the actuator side end of a shift rod a plunger which moves into and out of the coil, and switching freely the direction of current through the coil between normal and reverse directions. SOLUTION: An electromagnetic actuator 20 has a single solenoid coil 22 provided around the outer periphery of a plunger 21. The electromagnetic actuator 20 is designed so that by means of an operating switch the polarity of current passed through the solenoid coil 22 can be changed. By operation of a PTO switch, the direction of current through the solenoid coil 22 is switched between normal and reverse directions by means of a converter circuit. Therefore, the electromagnetic actuator 20 needs only one solenoid coil 22 provided therein, and the need for providing a shift rod 7 with a coil spring to restore it to its original position is eliminated, resulting in a decreased number of part items of a PTO device and in reduced weight and cost of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power take-off device having a function of electrically connecting a power take-off transmission clutch mechanism.

[0002]

2. Description of the Related Art In automobiles, engine power is sometimes used for purposes other than running, and a power take-off device for this purpose is called a power take-off device (hereinafter referred to as PTO device). Generally, the PTO device is mounted on the front portion, rear portion, or side surface of the transmission so as to extract the power from the auxiliary shaft gear of the transmission, and depending on the application, there are some that can switch between forward and reverse.

There are several types of switching mechanisms that use a PTO device to take out power or release power, using an electric motor, an electromagnetic solenoid or the like as a drive device. As an example of the PTO device, a case of an electromagnetic solenoid drive system mounted on the side surface will be described. As shown in FIG. 3, an idle shaft 2 fitted with an idle gear that meshes with an auxiliary shaft gear (not shown) of the transmission is installed. And a power take-off transmission flange 4 for attaching power take-off transmission for transmitting power to a purpose other than traveling, and a power take-out shaft 4 fitted with the drive gear 1 on the outer side thereof are arranged slightly apart from each other and coaxially arranged vertically. are doing.

A mesh gear 5 is attached to the end of the power take-off shaft 4 on the drive gear side.
A meshing sleeve gear 6 is slidably fitted on the outer side of the meshing gear, and a meshing gear 1a is provided on the end surface of the drive gear 1 on the power take-off shaft side. Is formed so as to project, and the meshing sleeve gear 6
Is slid in the axial direction, the two meshing gears 1a and 5 are connected to each other via the meshing sleeve gear 6, and power can be taken out.

A groove 6a is provided around the outer circumference of the meshing sleeve gear 6, and the tip of the shift lever 7a is inserted into this groove 6a so that the meshing sleeve gear 6 can be slid in the axial direction by the shift lever 7a. I have to. The shift lever 7 a is a shift rod 7 provided in parallel above the idle shaft 2 and the power takeoff shaft 4.
Further, the tip of the lever is arranged at a position where it can be inserted into the groove 6a of the meshing sleeve gear 6 and is externally fitted. Shift lever 7a
The shift rod 7 to which is attached is driven in the axial direction by an electromagnetic actuator 8 provided at the end of the shift rod 7.

The electromagnetic actuator 8 is composed of the shift rod 7
A stopper 9 for limiting the moving distance of the plunger 9 by providing a plunger 9 at the end of the electromagnetic actuator 8 side
0 is provided longitudinally and coaxially at a position slightly apart from the tip of the plunger 9, and the pulling coil 11 is coaxially wound around the outer periphery of the abutting position of the plunger 9 and the stopper 10 so as to straddle the plunger 9 and the stopper 10. The holding coil 12 is coaxially provided around the outer periphery of the stopper 10.

The pulling coil 11 and the holding coil 12 are provided with operating switches (not shown) for turning on and off the PTO on the driver's cab side, and the driver operates the operating switches from the driver's cab side to operate them. The circuit is energized to activate the electromagnetic actuator 8. A coil spring 13 for urging the shift rod 7 so as not to move to the power take-out side when not energized is wound around the shift rod 7 between the shift lever 7a and the inner surface of the gear case.

When the switch is operated from the driver's cab side, first, the pulling switch is turned on to energize the pulling coil 11, and the pulling coil 11 causes the plunger 9 and the stopper 1 to move.
The shift rod 7 is moved to the power take-out side by magnetizing 0 and 0 in the directions to attract each other. A few seconds later, the holding coil 12 is automatically energized to hold the shift rod 7 on the power take-out side, and even if the pulling switch is turned off, the shift rod 7 takes out the power against the biasing force of the coil spring 13. It will be possible to maintain the state of being located on the side.

[0009]

In the above-mentioned conventional technique, two coils, that is, a pulling coil 11 for pulling the shift rod 7 when the power is taken out and a holding coil 12 for maintaining the pulling state are provided. However, since the return spring 13 for returning is also required, the number of parts is increased and the weight is increased.

The present invention is intended to solve the above-mentioned problems in the prior art, and an object thereof is to reduce the number of parts and the weight by reducing the number of parts by using only one coil of the actuator to eliminate the return spring. To provide a power take-off device.

[0011]

[Means for Solving the Problems] Claim 1 in the present invention
The power take-off device described includes an electromagnetic actuator that moves the shift rod in the axial direction by the magnetic force of an electromagnetic coil, and operates the shift rod by the electromagnetic actuator to control connection / disconnection of a clutch mechanism for power transmission. In the power take-off device
A single coil is incorporated in the electromagnetic actuator, a plunger that moves in and out of the coil is formed by a permanent magnet, and the plunger is attached to the actuator-side end of the shift rod.
By providing a conversion circuit that reverses the direction of the current flowing through the coil, the shift rod can be pulled,
It is possible to return.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of the present invention, in the following example, a case where the return side is always energized will be described. However, portions that are the same as those in the related art are denoted by the same reference numerals, and description thereof is omitted. In addition, this example does not limit the present invention unless otherwise specified.

[Structure] FIG. 1 is a side sectional view showing the structure of a PTO device according to an embodiment. To the shift rod 7 provided in parallel with the drive shaft 4 to which the drive gear 1 is attached, a plunger 21 formed by molding a permanent magnet into a columnar shape is attached to the end portion on the electromagnetic actuator 20 side. The shift lever 7a is attached to the position where the meshing sleeve gear 6 that slides between the meshing gear 5 attached to the drive gear 1 and the meshing gear 1a protruding from the drive gear 1 is arranged.

In the electromagnetic actuator 20, a single electromagnetic coil 22 is provided around the outer circumference of the plunger 21. The electromagnetic coil 22 is arranged at a position most suitable for the movement of the plunger 21 in the power take-out direction and the power take-out releasing direction. The stoppers 10 are arranged vertically on the same axis of the plungers 21 at positions where the end surfaces on the abutting side are separated from each other by the plunger movement distance.

The electromagnetic actuator 20 is configured so that the polarity of the current supplied to the electromagnetic coil 22 can be changed by the operation switch. To change the polarity of the current,
For example, as shown in FIG. 2, a conversion circuit 23 including a relay circuit is used. Here, 24 is a PTO switch, and by operating this switch, the electric power from the battery 25 is supplied to the electromagnetic coil 22 via the conversion circuit 23, and the plunger 2
1 can be moved.

[Operation and Effect] In the PTO device configured as described above, by operating the PTO switch 24, the direction of the electric current of the electromagnetic coil 22 is reversed by the conversion circuit 23, so that the electromagnetic actuator 20 is operated. Need only be provided with a single electromagnetic coil 22, and the coil spring 13 for position return conventionally provided on the shift rod 7 is not required, and the number of parts of the PTO device can be reduced. In addition to the above, the weight can be reduced and the cost can be reduced.

[Alternative Embodiment] This embodiment is specifically described for better understanding of the present invention, and does not limit the alternative embodiment. Therefore, it can be changed without changing the gist of the invention. For example, the conversion circuit 23 may be replaced with a relay circuit by rotating a switch terminal that comes into contact with the connection terminal of the electromagnetic coil 22 by a rotary switch, or may be a transistor type switching circuit. In addition, although this PTO device is of a type in which the electromagnetic circuit is always energized,
In particular, since a load in the axial direction is not applied to the shift rod 7, it is possible to adopt a type in which the energization is performed only during the shift and the energization is cut off after the shift is completed. In this case, the PTO switch 24 may be a three-point contact type, or a circuit in which a delay circuit is incorporated in the conversion circuit 23 may be configured as a circuit that energizes for a fixed time.

[0018]

As described above, in the power take-off device according to the first aspect of the present invention, when the clutch mechanism is operated to the connection side during power take-out, the conversion circuit sets the direction of current to the power take-out side. Energize the coil incorporated in the electromagnetic actuator, and the energized coil operates the plunger to move the shift rod to the power take-off side, and when the power take-off is released, the clutch mechanism is operated to release the clutch. , The conversion circuit sets the direction of current to the power take-off release side and energizes the coil, and the energized coil moves the shift rod to the power take-off release side by moving the plunger in the opposite direction, and incorporates it into the electromagnetic actuator. Since the function of the coil that has been created can be reversed by the conversion circuit, the coil in the electromagnetic actuator can be With better in one of the coils, it is not necessary to provide a return spring in the shift rod, the number of parts becomes smaller it is possible to simplify the device configuration, it is possible to reduce the weight of it is possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a power take-off device according to an embodiment of the present invention.

FIG. 2 is a circuit explanatory diagram showing an electromagnetic circuit in the example.

FIG. 3 is a side sectional view showing a conventional power take-off device.

[Explanation of symbols]

 1 Drive Gear 1a Meshing Gear 2 Idle Shaft 3 Power Extraction Transmission Flange 4 Power Extraction Shaft 5 Meshing Gear 6 Meshing Sleeve Gear 7 Shift Rod 7a Shift Lever 10 Stopper 20 Electromagnetic Actuator 21 Plunger 22 Electromagnetic Coil 23 Conversion Circuit 24 PTO Switch 25 Battery

Claims (1)

[Claims] 1. A power for driving a shift rod in the axial direction by a magnetic force of an electromagnetic coil, the power for operating the shift rod by the electromagnetic actuator to control connection / disconnection of a clutch mechanism for transmission of power output. In the take-off device, a single coil is incorporated in the electromagnetic actuator, a plunger that moves in and out of the coil is formed by a permanent magnet, and the plunger is attached to the actuator-side end of the shift rod.
A power take-off device comprising a conversion circuit for converting the direction of a current passing through the coil in a forward and reverse direction.