JPH11159545A - Control method for rotation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method to reduce consumption of a power during running through direct coupling 4WD of a rotation transmission device to manually select the running mode of a vehicle into 2WD running, direct coupling 4WD running, and automatic control running. SOLUTION: A rotation transmission device A comprises a two-way clutch 10 incorporating a roller 17 between an internal member 12 and an outer wheel 13 and performs transmission and disconnection of rotation between the internal member 12 and the outer wheel 13; and an electromagnetic clutch 11 to control engagement and disengagement of the clutch 10. When a direct coupling 4WD running mode is selected, through intermittent carrying to an electromagnetic coil 21 with a current, consumption of a power is reduced and the generation of heat is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a rotation transmission device that switches between transmission and interruption of a driving force on a driving path of a vehicle.

[0002]

2. Description of the Related Art When a 4WD vehicle having directly connected front and rear wheels turns on a paved road, a so-called tight corner braking phenomenon occurs. As a means for solving this problem, the present applicant has filed Japanese Patent Application No. 8-172598. And Japanese Patent Application No. 9-28001
Proposed a rotation transmission device using a roller type two-way clutch and an electromagnetic coil.

[0003] As shown in FIGS. 1 and 2, this rotation transmission device A is provided in a FR-based 4WD vehicle in which a hub clutch 2 is mounted at each end of a front wheel 1 in a transmission 4 connected to an engine 3. The output is transmitted directly to the propulsion shaft 8 of the rear wheel 7 via the input shaft 6 inside the transfer 5, and inside the transfer 5, the input shaft 6 and a chain sprocket 9 mounted coaxially with the input shaft 6 so as to be relatively rotatable.
A two-way clutch 10 of a roller engagement type for transmitting and interrupting the rotation of the two-way clutch, and an electromagnetic clutch 11 for controlling locking and free of the two-way clutch 10 are provided. in addition to the mode (2WD, 4WD-Hi, 4WD -L 0), the control mode of the 4WD is added.

FIG. 3 shows a specific structure of the two-way clutch 10 and the electromagnetic clutch 11 in the rotation transmitting device A. The two-way clutch 10 includes an inner member 12 and an outer ring 1.
3 are rotatably fitted coaxially via a bearing, a plurality of cam surfaces 14 are provided on one of the inner member 12 and the outer ring 13, and a cylindrical surface 15 is provided on the other, and a wedge-shaped space is formed between both surfaces. A cage 16 is provided in the wedge-shaped space, and a roller 17 as an engaging element is incorporated in a plurality of pockets formed in the cage 16, and the cage is moved to a neutral position where the roller 17 does not engage with the cylindrical surface 15 and the cam surface 14. Switch spring 18 for supporting and biasing 16
Is locked between the retainer 16 and the inner member 12 or the outer ring 13 having the cam surface 14.

The electromagnetic clutch 11 includes a friction flange 19 fixed to the outer race 13 or the inner member 12 and an armature 20 fitted to the end of the cage 16 so as to be slidable with the cage 16 but not to rotate relative thereto. Are overlapped with an appropriate gap therebetween, and an electromagnetic coil 21 for pressing the friction flange 19 and the armature 20 by magnetic force is provided. By turning on and off the current of the electromagnetic coil 21, the roller 17 is engaged or idled. It has become.

In the above system, the ECU 23 (controller) starts applying a voltage to the electromagnetic coil 21 when the mode changeover switch 22 is in the manual mode.
It is desired that the time (response time) until the lock is fast.

FIG. 6 shows the relationship between the energization of the electromagnetic clutch 11 and the locking of the two-way clutch 10 in the conventional system, at the time when the ECU 23 detects the slip of the rear wheel and starts applying a voltage to the electromagnetic coil 21. When an electromagnetic force is generated in the electromagnetic coil 21 with a slight delay from t ₀ and the electromagnetic force increases with the passage of time, the friction torque generated between the armature 20 and the friction flange 19 caused by the electromagnetic force also increases, When the friction torque exceeds the torque of the switch spring 18 in the two-way clutch 10, the two-way clutch 10 is locked.

By the way, in order to increase the response from the time when the ECU 23 detects a slip to the time when the two-way clutch 10 is locked, a large amount of current must flow through the electromagnetic coil. Design is inevitable.

[0009]

In the conventional control method, when the driving mode is switched to the lock mode, the voltage (12 V) is kept applied to the electromagnetic coil, so that the power consumption is large in the lock mode. In addition, there is a problem that heat generation is large.

An object of the present invention is to provide a control method of a rotation transmission device that can reduce power consumption in a lock mode, turn off current during parking brake, and suppress wasteful power consumption. It is in.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the first aspect of the present invention, an engagement element is incorporated between an inner member and an outer ring to transmit rotation between the inner member and the outer ring. In a control method of a rotation transmission device including a clutch that performs disconnection and a control device that controls lock and free of the clutch, a configuration is set such that a current to the control device is intermittently supplied when lock control is always performed. Is adopted.

According to a second aspect of the present invention, in the first aspect, the clutch is rotatably fitted coaxially via the inner member and the outer ring, and a plurality of cam surfaces are provided on one of the inner member and the outer ring. Is provided, a cylindrical surface is provided on the other side, a wedge-shaped space is formed between both surfaces, a retainer is provided in the wedge-shaped space, and a roller as an engaging element is incorporated in a plurality of pockets formed in the retainer, and the roller has a cylindrical surface. An elastic member that supports and urges the retainer to a neutral position that does not engage with the cam surface is formed by locking the elastic member between the retainer and the inner member or the outer ring having the cam surface. A friction flange fixed to the member and an armature slidably and non-rotatably fitted with the cage at the end of the cage through an appropriate gap are overlapped, and the friction flange and the armature are pressed by magnetic force. Provide an electromagnetic coil for It is obtained by employing the structure being formed.

According to a third aspect of the present invention, in the second aspect of the present invention, the power to the electromagnetic coil is limited by a pulse width modulation control of a power supply voltage, and a friction force generated between the friction flange and the amateur by the current value. Adopts a configuration in which the current is set to a level that slightly overcomes the torque of the elastic member of the clutch.

According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the parking brake signal is inputted, and when the parking brake is operating, the current to the control means is turned off even in the direct connection 4WD mode. It was done.

According to a fifth aspect of the present invention, an engaging element is incorporated between the inner member and the outer ring to control transmission and cutoff of rotation between the inner member and the outer ring, and control locking and freeing of the clutch. In a vehicle rotation transmission control method which includes a control means and in which a traveling mode of the vehicle can be manually selected, a configuration is employed in which a current to the control means is set to flow intermittently when lock control is always performed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

The structure of the rotation transmitting device A is as shown in FIGS. 1 to 3, and the control method of the present invention is such that when the mode changeover switch 22 is selected for the direct connection 4WD traveling, the electromagnetic clutch 11 as the control means is controlled. The current is set to flow intermittently through the electromagnetic coil 21, and the power of this current is limited by pulse width modulation means PWM, as shown in FIG. 5, and the current value is generated between the friction flange 19 and the armature 20. The frictional force is set to a level that slightly overcomes the torque of the switch spring 18.

That is, since the response does not matter during the direct connection 4WD running (lock mode), it is sufficient that the voltage is generated such that the suction force is such that a friction force slightly larger than that of the switch spring 18 can be obtained. By controlling the pulse width modulation means, the duty ratio of the pulse is reduced, which is equivalent to reducing the voltage.

Therefore, the power consumption is less than the voltage of 12 V, and for example, the power consumption can be halved by adjusting the pulse, and the power consumption can be substantially 6 V.

As shown in FIG. 4, in the above control method, a parking brake signal is input to the controller, and when the parking brake is operating, the current to the electromagnetic coil 21 is turned off even in the direct connection 4WD mode. Thus, wasteful consumption of power can be suppressed.

The control method of the present invention is configured as described above. When the mode changeover switch 22 is switched to the direct connection 4WD driving mode during running of the vehicle, a pulse current is supplied to the electromagnetic coil 21 via pulse modulation means. When the frictional force generated between the friction flange 19 and the amateur 20 by the current value overcomes the torque of the switch spring 18, the mode is switched to the 4WD mode in which the front and rear wheels are directly connected. Although the electromagnetic coil 21 is always energized, the power consumption can be substantially reduced by applying a pulse current, and the generation of heat can also be suppressed.

[0022]

As described above, according to the present invention, when the direct connection 4WD running of the rotation transmitting device is selected, the current is set to intermittently flow to the control means for controlling the lock and free of the clutch. This is equivalent to lowering the voltage of the current, thereby improving the economic efficiency by reducing the power consumption and suppressing the generation of heat.

[Brief description of the drawings]

FIG. 1 is a plan view showing a layout of a 4WD drive vehicle incorporating a rotation transmission device.

FIG. 2 is a cross-sectional view of a transfer incorporating a rotation transmission device.

3A is a longitudinal sectional view of a rotation transmitting device, and FIG. 3B is a longitudinal sectional view of the same.

FIG. 4 is a block diagram showing a control method of the rotation transmission device.

FIG. 5 is an explanatory diagram showing a relationship between energization of an electromagnetic coil and torque in a control method.

FIG. 6 is an explanatory diagram showing a relationship between energization of an electromagnetic coil and torque in a conventional control method.

[Description of Signs] 5 Transfer 6 Input shaft 10 Two-way clutch 11 Electromagnetic clutch 12 Inner member 13 Outer ring 14 Cam surface 15 Cylindrical surface 16 Cage 17 Roller 18 Switch spring 19 Friction flange 20 Amateur 21 Electromagnetic coil

Claims (5)

[Claims] 1. A clutch that incorporates an engagement element between an inner member and an outer ring to transmit and cut off rotation between the inner member and the outer ring, and control means that controls locking and freeing of the clutch. A method for controlling a rotation transmission device, wherein a current is supplied to a control means intermittently when constant lock control is performed. 2. A clutch, wherein the clutch is rotatably fitted coaxially via an inner member and an outer ring, a plurality of cam surfaces are provided on one of the inner member and the outer ring, and a cylindrical surface is provided on the other. A wedge-shaped space is formed in the wedge-shaped space, a cage is provided in the wedge-shaped space, a roller as an engaging element is incorporated in a plurality of pockets formed in the cage, and the cage is moved to a neutral position where the roller does not engage with the cylindrical surface and the cam surface. An elastic member for supporting and urging is formed by locking between the retainer and the inner member or the outer ring having the cam surface, and the control means includes: a friction flange fixed to the outer ring or the inner member; An armature slidably and non-rotatably fitted with the retainer at an end thereof is overlapped through an appropriate gap, and an electromagnetic coil is provided for pressing the friction flange and the armature by magnetic force. Item 6. The control method according to Item 1. 3. The current to the electromagnetic coil limits the power to the power supply voltage by pulse width modulation control, and the current value causes the frictional force generated between the friction flange and the armature to slightly overcome the torque of the elastic member of the clutch. 3. The method according to claim 2, wherein the current is set to a level. 4. The system according to claim 1, wherein a parking brake signal is input, and when the parking brake is operating, the current to the control means is turned off even when the parking brake is constantly locked. A method for controlling a rotation transmission device. 5. A clutch which incorporates an engagement element between an inner member and an outer ring to transmit and cut off rotation between the inner member and the outer ring, and control means for controlling locking and free of the clutch, In the vehicle rotation transmission control method in which the traveling mode of the vehicle can be manually selected, when always performing lock control,
A method for controlling rotation transmission of a vehicle, characterized in that current is supplied to the control means intermittently.