JP5527295B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device that transmits rotational power of a drive source to a drive target, and in particular, a power transmission device including a clutch that intermittently transmits power between an output portion of a drive body and an input portion of a driven body. Related to.

[Conventional technology]
Conventionally, a power transmission device that transmits rotational power of a motor to a shaft that supports and fixes a valve body (valve) of an intake control valve is known (see, for example, Patent Documents 1 and 2).
The intake control valve constitutes a tumble control valve that generates a vertical intake vortex flow (tumble flow) in the combustion chamber of the internal combustion engine by restricting the cross-sectional area of the intake passage through which intake air sucked into the combustion chamber of the internal combustion engine flows. doing.
The power transmission device includes a speed reduction mechanism that reduces the rotation of the motor by two stages and transmits it to the valve shaft. The speed reduction mechanism includes a worm gear fixed to the output shaft of the motor, a helical gear meshing with the worm gear, a spur gear arranged on the same axis as the helical gear, and an output gear meshing with the spur gear.

Here, when the intake control valve is fully closed, power is supplied to the motor so that the opening of the valve is in the fully closed position (fully closed position) by the driving torque of the motor. ing. And the motor control apparatus which performs energization control of a motor sends holding current to a motor, after a valve | bulb reaches | attains a fully closed position. Thus, the valve is held in the fully closed position using the holding torque of the motor.
Further, when the valve of the intake control valve is fully opened, electric power is supplied to the motor so that the opening degree of the valve is in a fully opened position (fully opened position) by the driving torque of the motor. Then, the motor control device passes a holding current to the motor after the valve reaches the fully open position. As a result, the valve is held in the fully open position using the holding torque of the motor.

[Conventional technical problems]
However, the valves of the intake control valves described in Patent Documents 1 and 2 are installed in an intake passage where a large intake negative pressure and a small atmospheric pressure repeatedly act as the piston of the internal combustion engine moves up and down and the intake valve opens and closes. ing. That is, the intake load due to the intake pressure pulsation generated when the piston of the internal combustion engine is raised and lowered and the intake valve is opened and closed acts on the valve of the intake control valve.
For example, when an intake load acts on the valve while the intake control valve is fully open, intake pulsation torque is generated that rotates the valve toward the valve closing side about the shaft. As a result, the valve of the intake control valve flutters in the intake passage of the internal combustion engine, and the valve returns. When the valve returns, the passage cross-sectional area of the intake passage of the internal combustion engine is narrowed even when the valve is fully opened.

Here, if the passage cross-sectional area of the intake passage of the internal combustion engine becomes narrow as the valve returns, the flow rate of the intake air introduced into the combustion chamber of the internal combustion engine when the valve is fully opened decreases, and the necessary intake air flow rate can be obtained. Since it becomes impossible, the output of an internal combustion engine falls. There is also a problem that drivability deteriorates with a decrease in the output of the internal combustion engine.
Therefore, as a method of holding the valve of the intake control valve in the fully open position for the purpose of preventing the deterioration of drivability, it is necessary to constantly supply a holding current to the motor and generate a holding torque to the motor. Problems such as an increase in the size of the actuator including the power transmission device or an increase in power consumption of the motor occur. In addition, fuel consumption deteriorates as the power consumption of the motor increases.

On the other hand, a power transmission device that transmits the rotational power of a motor to a shaft that supports a valve of an intake control valve is known that includes a clutch that interrupts power transmission between a driving body and a driven body (for example, (See Patent Documents 3 and 4).
When the motor is energized, the driving body and the driven body are engaged, and rotational power is transmitted from the driving body to the driven body.
In addition, when the motor is energized, the rotational force transmitted to the driven body is transmitted to the case, which is a fixed member, and not to the driver, even if a rotational force is temporarily applied to the driven body. Has been. Thereby, energization of the motor can be stopped when the valve opening degree is constant (fully closed position, fully opened position, intermediate position).

As shown in FIG. 6, the power transmission devices described in Patent Documents 3 and 4 are rotationally driven body 101 fixed (connected) so as to be integrally rotatable with an output shaft of a motor, and rotationally driven by this rotationally driven body 101. Thus, the power transmission between the rotation driven body 102 fixed to (coupled to) the outer periphery of the input shaft (for example, the worm gear shaft) of the speed reduction mechanism so as to be integrally rotatable, and the rotation drive body 101 and the rotation driven body 102 is interrupted. The clutch includes a rotary drive body 101, a rotary follower 102, and a cylindrical housing 103 that houses the clutch.
The clutch is a roller 107 disposed in a radial gap formed between the engagement portion between the output portion 104 of the rotation drive body 101 and the input portion 105 of the rotation follower 102 and between the rotation follower 102 and the housing 103. And a retainer 108 that is supported so as to be movable in the circumferential direction around the rotation center point of the rotation drive body 101 and the rotation follower 102.

The radial gap includes a central gap 111 having a radial distance L1 and both circumferential gaps 112 having a radial distance L2 provided at both ends in the circumferential direction of the central gap 111. The both end gaps 112 are smaller than the central gap 111.
The diameter (radial dimension) L3 of the roller 107 is smaller than the central gap 111 and larger than both end gaps 112 (L1>L3> L2).
The rotary drive body 101 has a mesh release protrusion 109 that moves the roller 103 toward the central gap 111 in an engaged state in which the rotary drive body 102 abuts on the input part 105 of the rotary follower 102 in the circumferential direction.

The power transmission device including a clutch that intermittently transmits and receives power between the rotary drive body 101 and the rotary driven body 102 performs the following operation by including the above-described configuration.
When electric power is supplied to the motor and the output shaft of the motor rotates in the forward direction or the reverse direction, the mesh release protrusion 109 causes the roller 107 to move toward the central gap 111 side by the rotational power transmitted to the rotary drive body 101. Move. As a result, the rotary drive body 101 and the rotary follower body 102 can move freely with respect to the housing 103. Then, the output unit 104 of the rotational drive body 101 is engaged with the input unit 105 of the rotational follower 102. As a result, the rotational power of the rotational drive body 101 is transmitted to the rotational follower 102, and the rotational follower 102, the roller 107, and the retainer 108 rotate following the rotational drive body 101.

  On the other hand, in a state where the supply of electric power to the motor is stopped, an opening / closing member installed in a flow path in which pressure pulsation occurs (for example, a valve of an intake control valve installed in an intake passage of an internal combustion engine) flutters. Thus, when a rotational force is applied to the rotation follower 102 side, the roller 107 supported by the retainer 108 is sandwiched between the rotation follower 102 and the housing 103 by a slight change in rotation of the rotation follower 102. The rotary follower 102 and the housing 103 are engaged with each other via the roller 107. As a result, the rotation follower 102 is prevented from rotating.

However, in a power transmission device including a clutch that intermittently transmits power between the rotary drive body 101 and the rotary follower 102, the rotary follower 102 and the retainer 108 follow the rotary drive body 101 when driving force is transmitted. , The roller 107 is pushed radially outward by the centrifugal force F, and the sliding surface of the roller 107 is in sliding contact with the inner peripheral surface of the housing 103. As a result, the sliding surface of the roller 107 may be worn by the sliding contact of the roller 107, or the sliding surface of the roller 107 may be damaged.
In addition, when the driving force is transmitted, the inner peripheral surface of the housing 103 and the sliding surface of the roller 107 are in sliding contact with each other, which may cause an operating noise (sliding noise).

JP 2001-248449 A JP 2008-322424 A JP 2003-199290 A JP 2007-198584 A

An object of the present invention is to provide a power transmission device capable of improving the durability of a roller by preventing the roller from sliding and contacting with a housing at the time of transmitting a driving force, thereby reducing the wear and damage of the roller. There is.
It is another object of the present invention to provide a power transmission device capable of suppressing the generation of operating noise by preventing the sliding contact of the roller with the housing during transmission of the driving force.

According to the first aspect of the present invention, in the power transmission device that transmits the rotational power of the drive source to the drive target, the drive body that is rotationally driven by the drive source, and the rotational power of the drive source transmitted from the drive body A cylindrical fixed body that forms a radial clearance between a driven body that rotates following the drive body and an outer periphery of the driven body, and that surrounds the periphery of the drive body and the driven body in the circumferential direction; When the rotational power of the drive source is transmitted from the body, a retainer that rotates following the drive body and a roller that is supported so as to be movable in the radial direction with respect to the retainer are provided.
The follower is provided with a magnet that generates an attracting force that opposes the centrifugal force acting on the roller. The roller is made of a magnetic material that can be attracted by the magnet's attracting force.

According to the first aspect of the present invention, the driven body is provided with a magnet, and the roller is made of a magnetic body, so that when the driving force is transmitted, the driven body and the retainer receive rotational power from the driving body, When following and rotate, the roller supported by the retainer is attracted to the magnet provided on the driven body.
As a result, an attracting force in a direction opposite to the centrifugal force acts on the roller, so that the roller can be held on the opposite side (for example, the driven body side) with respect to the housing side even when driving force is transmitted. As a result, the driven body and the retainer rotate following the drive body that is rotationally driven by the drive source without the roller contacting the housing.
Therefore, when the driving force is transmitted, the roller is not pushed outward in the radial direction by centrifugal force, and the sliding contact of the roller with the housing is prevented, thereby reducing the wear and damage of the roller and improving the durability of the roller. Can be improved.
Further, since the sliding contact of the roller with the housing can be prevented at the time of driving force transmission, it is possible to suppress the generation of noise such as operating noise.

According to the second aspect of the present invention, the drive body having the output portion capable of reciprocating in the rotation direction of the drive body is provided in the annular circumferential area surrounding the periphery of the rotation center of the drive body in the circumferential direction. . The driven body and the retainer are arranged in an annular circumferential area where the output portion of the drive body can reciprocate so that the driven body and the retainer come into contact with (engage with) the output portion of the drive body when driving force is transmitted. Then, the rotational power of the drive source is transmitted from the output part of the drive body to the driven body and the retainer. At this time, the roller supported by the retainer also rotates integrally with the retainer.
According to the third aspect of the present invention, the driven body is provided with an input section that abuts (engages) in the circumferential direction of the drive body and receives the rotational power of the drive source from the drive body.
Then, by arranging the input part of the driven body in an annular circumferential area where the output part of the driving body can reciprocate, the input part of the driven body comes into contact with the output part of the driving body when the driving force is transmitted ( The rotational power of the drive source is transmitted from the output part of the driving body to the input part of the driven body.

According to the fourth aspect of the present invention, for example, when the driving force transmission is interrupted (when the driving force is interrupted), in the radial gap formed between the outer periphery of the driven body and the inner periphery of the fixed body, Alternatively, a retainer or a roller is disposed so as to be rotatable relative to the driven body.
According to the invention described in claim 5, the roller is rotatably supported by the retainer.
According to the invention described in claim 6, the radial gap has a central gap having a wide gap and an end gap having a narrower gap than the central gap. The end gap is formed at both ends in the circumferential direction of the central gap.

According to the seventh aspect of the present invention, the driving body having the meshing release protrusion that moves the roller from the end gap to the central gap side by pressing the retainer in the circumferential direction is provided.
When the driving force is transmitted, the meshing release protrusion of the driving body that is rotationally driven by the driving source presses the retainer in the circumferential direction, thereby moving the roller from the end clearance to the central clearance. As a result, the engagement by the roller is released, so that the driving body and the driven body come into contact (engagement), and the rotational power of the driving source is transmitted from the driving body to the driven body. Therefore, the driven body rotates following the driving body.

According to invention of Claim 8, the magnet which has the magnetic pole surface exposed by the surface (outer peripheral surface) of the follower is provided.
The magnet may have an axial dimension that is parallel to the rotational axis direction of the driving body or the driven body shorter, the same, or longer than the overall axial length of the roller.
According to invention of Claim 9, parts other than the magnet of a follower are comprised by the nonmagnetic material. The magnet is embedded and fixed inside the driven body.
That is, if the portion other than the magnet of the driven body is made of a non-magnetic material, the magnetic pole surface of the magnet does not need to be exposed on the surface (outer peripheral surface) of the driven body.

According to the tenth aspect of the present invention, the drive target is an opening / closing member that opens and closes a flow path in which pressure pulsation occurs.
The driving source is a motor that generates a driving force when supplied with electric power.
Further, the flow path in which pressure pulsation is generated is an intake passage through which intake air sucked into the internal combustion engine flows or an exhaust passage through which exhaust gas discharged from the internal combustion engine flows.
The opening / closing member is an intake control valve, an exhaust control valve, or an EGR control valve that controls intake or exhaust gas (EGR gas) by opening and closing an intake passage or an exhaust passage.

(A) is sectional drawing which showed the main structures of the power transmission device, (b) is explanatory drawing which showed the radial direction position of the roller at the time of driving force transmission (Example 1). It is sectional drawing which showed the main structures of the power transmission device (Example 1). (A), (b) is the side view seen from the arrow A direction of FIG. 2 (Example 1). (A) is explanatory drawing which showed the radial direction position of the roller at the time of driving force transmission, (b) is explanatory drawing which showed the position of the roller at the time of driving force interruption | blocking (Example 1). (A) is sectional drawing which showed the main structures of the power transmission device, (b) is explanatory drawing which showed the radial direction position of the roller at the time of drive force transmission (Example 2). (A) is sectional drawing which showed the main structures of a power transmission device, (b) is explanatory drawing which showed the radial direction position of the roller at the time of driving force transmission (conventional technique).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
An object of the present invention is to improve the durability of a roller by reducing the wear and damage of the roller by preventing the sliding contact of the roller with respect to the housing when the driving force is transmitted. The follower is provided with a magnet that generates an attractive force P that opposes the centrifugal force F acting on the roller for the purpose of suppressing the generation of operating noise by preventing the sliding contact of the roller with respect to the roller. This is realized by configuring the roller with a magnetic material that can be attracted by the magnet's attracting force P.

[Configuration of Example 1]
FIGS. 1 to 4 show Embodiment 1 of the present invention. FIGS. 1 (a) and 2 are diagrams showing the main structure of a power transmission device, and FIG. 1 (b) is a diagram when driving force is transmitted. FIGS. 3A and 3B are views showing the radial position of the roller, and FIGS. 3A and 3B are views showing the attachment position of the magnet with respect to the driven state.

The power transmission device of this embodiment is applied to an intake control device (for example, an intake vortex generator) mounted on an internal combustion engine (engine) having a plurality of cylinders.
The intake vortex generator is an intake duct that forms an intake passage through which intake air (intake) sucked into the combustion chamber of the engine flows, and an opening / closing operation of the intake air that flows through the intake passage (throttle the passage cross-sectional area of the intake passage) An intake control valve (tumble control valve: TCV) that generates a vertical intake vortex flow (tumble flow) in the combustion chamber of the engine, and an actuator that rotationally drives a shaft that supports and fixes the valve of the tumble control valve. Yes.

The actuator includes a motor that drives a valve to be driven, a power transmission device that transmits rotational power (driving force) of the motor to the shaft of the valve, and the like.
A motor that rotationally drives a shaft to open and close a valve is electrically connected to a battery mounted on a vehicle such as an automobile through a motor drive circuit electronically controlled by a motor control unit (engine control unit: hereinafter referred to as ECU). Connected. That is, the motor is a drive source (power source) that generates rotational power when supplied with electric power, and is configured to be electronically controlled by the ECU.
The ECU includes functions such as a CPU that performs control processing and arithmetic processing, a control program or control logic and a storage device (memory such as ROM and RAM) that stores various data, an input circuit, an output circuit, a power supply circuit, a timer, and the like. There is provided a microcomputer having a well-known structure.

The ECU has an operation state detection unit that detects an operation state (operation state) of the engine. The operating state of the engine can be detected by the engine speed, the engine load (accelerator opening or throttle opening), the intake air amount, the TCV opening, the engine coolant temperature, the intake air temperature, and the like.
In addition, the ECU converts the output signals from various sensors such as a crank angle sensor, an accelerator opening sensor, a throttle opening sensor, an air flow meter, a TCV opening sensor, and a cooling water temperature sensor into A / D conversion by an A / D conversion circuit. And then input to the microcomputer.

The power transmission device is connected to a motor output shaft via a bi-directional clutch for intermittently transmitting / receiving driving force between a rotary drive (drive) 1 and a rotary follower (driven) 2, and to the motor output shaft via the bi-directional clutch. And a speed reduction mechanism that transmits the speed to a shaft that supports and fixes the valve.
The speed reduction mechanism has a worm gear fixed to the output portion of the driven 2 of the two-way clutch, a helical gear meshing with the worm gear, a spur gear arranged on the same axis as the helical gear, an output gear meshing with the spur gear, and the like.
The reduction mechanism may be configured by a first gear (pinion gear) connected to the output portion of the two-way clutch, a second gear (intermediate gear) meshing with the first gear, a third gear meshing with the second gear, and the like. good.

Next, details of the two-way clutch incorporated in the power transmission device of this embodiment will be described with reference to FIGS.
The two-way clutch of the present embodiment includes a non-magnetic drive 1 fixed to the output shaft of the motor, a magnetic driven 2 that rotates following the drive 1, and the periphery of the drive 1 and the driven 2. A cylindrical fixed body (a non-magnetic housing) 3 that surrounds the circumferential direction and a plurality of radial gaps formed between the outer peripheral surface of the driven 2 and the inner peripheral surface of the housing 3 are arranged. A plurality of retainers 4, a plurality of rollers 5 rotatably supported by these retainers 4, and a plurality of magnets (magnets) that generate an adsorption force P that opposes the centrifugal force F acting on the plurality of rollers 5 during power transmission 6).

The drive 1 is made of metal. The drive 1 is arranged in a circumferential clearance of one input portion (not shown) coupled to the output shaft of the motor and an outer peripheral ridge (the outer peripheral ridge 20 of the driven 2) adjacent to the driven 2 in the circumferential direction. A plurality of driving fan portions (radial ridges) 10 are provided.
The plurality of driving fans 10 are provided at predetermined circumferential intervals (equal intervals: for example, 120 ° intervals) at a predetermined circumferential distance in the circumferential direction of the drive 1. These driving fan units 10 are output units (engaging units) that can reciprocate (rotate) in the rotation direction of the drive 1 in an annular circumferential area surrounding the periphery of the rotation center of the drive 1 in the circumferential direction. 11 and 12.
Engagement release protrusions 13 and 14 projecting in the rotational direction of the drive 1 are integrally provided on the outer peripheral side in the radial direction of the output parts 11 and 12 of the plurality of drive fans 10. The meshing release protrusions 13 and 14 of the plurality of drive fans 10 have inclined surfaces that are larger in the rotational direction than the output units 11 and 12 with respect to the radial direction extending radially from the rotation center of the drive 1. Yes.

The output units 11 and 12 of the drive 1 are formed on the side surfaces on both sides in the circumferential direction of the plurality of drive fans 10. Each output unit 11, 12 has an inclined surface slightly inclined in the rotational direction with respect to the radial direction extending radially from the rotational center of the drive 1.
The output unit 11 abuts (engages) with the input unit 21 of the driven 2 when the drive 1 rotates in the forward rotation direction (left rotation in the drawing). The output unit 12 contacts (engages) with the input unit 22 of the driven 2 when the drive 1 rotates in the reverse direction (right rotation in the drawing).
Thus, when the drive 1 is driven to rotate by the motor, the output units 11 and 12 come into contact (engagement) with the input units 21 and 22 of the driven 2, and the rotational power of the motor is transmitted from the drive 1 to the driven 2. The
Details of the drive 1 will be described later.

The driven 2 is a cylindrical output portion (fitting portion) 19 that is fixed to the outer periphery of a worm gear shaft that is an input shaft of the speed reduction mechanism, and projects from the outer peripheral surface of the output portion 19 toward the outer peripheral side in the radial direction. A plurality of outer peripheral ridges 20 are provided.
A press-fitting hole (fitting hole) 18 into which the worm gear shaft is press-fitted and fixed is formed inside the output unit 19.
The plurality of outer peripheral ridges 20 are provided at predetermined circumferential intervals (equal intervals: for example, 120 ° intervals) at a predetermined circumferential distance in the circumferential direction of the driven 2. These outer peripheral ridges 20 are installed between adjacent drive fan portions 10 of the drive 1. Thereby, the outer periphery protrusion 20 and the drive fan part 10 are alternately arrange | positioned in the circumferential direction area.
The plurality of outer peripheral ridges 20 are in contact (engaged) in the circumferential direction of the output portions 11 and 12 of the drive 1 and receive the rotational power of the motor from the plurality of driving fans 10 when the driving force is transmitted. 21 and 22. The input portions 21 and 22 of the driven 2 are inclined surfaces slightly inclined in the rotational direction with respect to the radial direction extending radially from the rotation center of the driven 2 (for example, the same as the inclined surfaces of the output portions 11 and 12 of the drive 1). An inclined surface having an angle (which allows surface contact).

The input units 21 and 22 of the driven 2 are arranged in a circumferential area in which the output units 11 and 12 of the drive 1 can reciprocate in the rotation direction, so that the input units of the driven 2 can be transmitted during driving force transmission. 21 and 22 come into contact (engagement) with the output units 11 and 12 of the drive 1, and the rotational power of the motor is transmitted from the output units 11 and 12 of the drive 1 to the input units 21 and 22 of the driven 2. The
A flat surface 23 parallel to the tangential direction of the inner peripheral surface 31 of the housing 3 is formed on the outer peripheral surface of the driven 2, that is, the radially outer surface of the plurality of outer peripheral ridges 20.
A plurality of magnets 6 having magnetic pole surfaces 25 exposed on the flat surface 23 are embedded and fixed inside the plurality of outer peripheral protrusions 20.
Details of the driven 2 and the magnet 6 will be described later.

The housing 3 is integral with the casing of the power transmission device, or is connected and fixed to the casing so that it cannot rotate. The housing 3 is a cylindrical case that covers the outer periphery of the drive 1 and the driven 2, and is a cylindrical body that extends straight in the axial direction parallel to the rotational axis direction of the drive 1 or the driven 2. The housing 3 has a cylindrical cross section perpendicular to the axial direction thereof.
The housing 3 has a concave curved inner peripheral surface 31 having a predetermined radius of curvature centering on the rotation shaft of the motor output shaft, the rotation shaft of the drive 1, and the rotation shaft of the driven 2. An inner peripheral surface 31 of the housing 3 is a meshing surface with the roller 5. The center of curvature of the inner peripheral surface 31 of the housing 3 coincides with the rotational center of the drive 1 and the rotational center of the driven 2.

Incidentally, the housing 3 constituting the two-way clutch is provided with an inner peripheral surface 31 that meshes with the roller 5 when the driving force is interrupted. The inner peripheral surface 31 is provided with a plurality of depressions that prevent the roller 5 from moving and rotating while the roller 5 is pressed.
In the present embodiment, a groove 32 in which each roller 5 can be fitted shallowly is employed as the recess. The plurality of grooves 32 have an arcuate meshing surface and are provided parallel to the axial direction of the roller 5. The plurality of grooves 32 are formed on the inner peripheral surface 31 of the housing 3 at equal intervals (for example, 120 ° intervals). The plurality of grooves 32 may not be provided.

Here, in the bidirectional clutch of this embodiment, both end gaps 33 and center gap 34 are formed in a radial gap formed between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3. .
Both end gaps 33 are one end gaps formed between the intersecting ridge line or R chamfered portion of the inclined surface of the input portion 21 of the driven 2 and the flat surface 23, and the inner peripheral surface 31 of the housing 3, and the driven 2 A gap between the inclined surface of the input portion 22 and the flat surface 23 or an R chamfered portion and an inner peripheral surface 31 of the housing 3 is provided.

Both end clearances 33 are formed on both sides of the central clearance 34 in the circumferential direction (rotation direction). Further, the gaps 33 at both ends are narrower in the radial direction than the gaps 34 at the center.
The central gap 34 is formed between the adjacent gaps 33 at both ends. The central gap 34 is wider in the radial direction than the both-end gap 33. In other words, the radial distance (L1) between the plane 23 of the driven 2 and the inner peripheral surface 31 of the housing 3 in the central gap 34 is equal to the plane 23 of the driven 2 and the inner peripheral surface of the housing 3 in the gaps 33 at both ends. It is larger (longer) than the radial distance (L2) from 31.

The plurality of retainers 4 are made of a nonmagnetic material such as a synthetic resin. These retainers 4 are rotatably supported with respect to the rotation centers of the drive 1 and the driven 2. Further, the plurality of retainers 4 are in contact (engaged) in the circumferential direction of the meshing release protrusions 13 and 14 of the drive 1 and receive the rotational power of the motor from the plurality of driving fan units 10 when the driving force is transmitted. It has the parts 41 and 42.
The plurality of retainers 4 are provided with concave grooves 43 and 44 that rotatably support (hold) each roller 5 and also support (hold) each roller 5 so as to be movable in the radial direction. The concave grooves 43, 44 are formed with concave curved sliding surfaces having a radius of curvature slightly larger than the diameter L 3 of each roller 5. The sliding surfaces of the concave grooves 43 and 44 are arranged to face each other with a rolling space of the roller 5 therebetween.

The roller 5 is made of a magnetic material (for example, iron-based metal). The roller 5 is disposed in a radial gap between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3.
The roller 5 is a cylindrical body that extends straight in the axial direction parallel to the rotational axis direction of the drive 1 or the driven 2. The roller 5 has a circular cross section perpendicular to the axial direction.
The roller 5 is supported (held) so as to be movable in the radial direction of the drive 1 or the driven 2 with respect to the sliding surfaces of the concave grooves 43 and 44 of the retainer 4. Further, both sides in the circumferential direction of the roller 5 are rotatably supported (held) by the concave grooves 43 and 44 of the retainer 4.

The diameter L3 of the roller 5 is smaller in the radial dimension than the central gap 34 and larger in the radial dimension than both end gaps 33.
That is, they are provided in a relationship of L1>L3> L2.
As a result, the roller 5 is always disposed in the radial gap between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3.
When the roller 5 exists at a position where the radial distance between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3 is larger than the diameter L3 of the roller 5, the driven 2 can rotate with respect to the housing 3. When the radial distance between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3 matches the diameter L3 of the roller 5, the roller 5 is located between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3. It will be in a state of being sandwiched between. That is, the driven 2 is engaged with the housing 3 via the roller 5, and the rotation of the driven 2 is prevented by the housing 3.

Next, the details of the drive 1 of the present embodiment will be briefly described with reference to FIGS.
Each of the meshing release protrusions 13 and 14 of the drive 1 moves the roller 5 from the gaps 33 at both ends to the center gap 34 side during transmission of the driving force, so that the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3 The roller 5 is moved to a position where the radial distance is larger than the diameter L3 of the roller 5.
Specifically, as described above, the roller 5 is held on both sides in the circumferential direction by the concave grooves 43 and 44 of the retainer 4, and the mesh release protrusions 13 and 14 press the retainer 4 in the circumferential direction. Then, the roller 5 is moved to the center gap 34 side, and the rotation of the roller 5 (centering on the rotation axis of the roller 5) in the radial gap between the flat surface 23 of the driven 2 and the inner peripheral surface 31 of the housing 3 is performed. Free rotation.

Next, details of the driven 2 and the magnet 6 of this embodiment will be briefly described with reference to FIGS.
The driven 2 is made of a magnetic material such as an iron-based metal. On the outer peripheral surface of the driven 2, that is, the central portion of the radial outer surface (plane 23) of the plurality of outer peripheral ridges 20 (for example, the portion where the radial distance from the inner peripheral surface 31 of the housing 3 is L 1) An axial groove 24 parallel to the axial direction is formed. This axial groove 24 opens at the plane 23 of the driven 2.
A rectangular parallelepiped magnet 6 is fixed to the axial groove 24 (adsorption fixing or fixing using an adhesive or the like).

The plurality of magnets 6 are provided in a number corresponding to the plurality of outer peripheral ridges 20, and are configured as separate parts with respect to the magnetic body constituting the driven 2. These magnets 6 are fitted into the axial grooves 24 of the plurality of outer peripheral ridges 20.
The magnetic pole surfaces 25 of the plurality of magnets 6 are exposed on the plane 23 of the driven 2.
As the plurality of magnets 6, permanent magnets that generate an attractive force (magnetic force) P that opposes the centrifugal force F acting on each roller 5 at the time of driving force transmission are used.

For example, rare earth magnets such as samarium-cobalt (Sm-Co) magnets and neodymium (Nd) magnets, alnico magnets, ferrite magnets, and resin magnets are used as the permanent magnets.
The plurality of magnets 6 may have the same dimension in the axial direction parallel to the rotational axis direction of the drive 1 or the driven 2 even if they are shorter than the total axial length of each roller 5 (see FIG. 3A) or the same (see FIG. 3 (b)), and may be long.
The magnet 6 may be an electromagnet having a coil that generates magnetic force when supplied with electric power, instead of a permanent magnet.

[Operation of Example 1]
Next, the operation of the two-way clutch incorporated in the power transmission device of this embodiment will be briefly described with reference to FIGS.

(A) When driving force is transmitted When electric power is supplied to the motor by the ECU, the output shaft of the motor rotates in the forward direction (for example, left rotation direction) or in the reverse direction (for example, right rotation direction). At this time, the drive 1 connected to the output shaft of the motor so as to be integrally rotatable rotates around the rotation center. Accordingly, the plurality of drive fans 10 move (rotate) in the rotational direction in an annular circumferential area that surrounds the periphery of the rotation center of the drive 1 in the circumferential direction.

  And since each input part 41 and 42 of the retainer 4 is arrange | positioned in the circumferential direction area where each output part 11 and 12 of the drive 1 moves to a rotation direction, with the rotational power of the motor transmitted to the drive 1, The mesh release protrusion 13 or the mesh release protrusion 14 of the drive 1 moves the roller 5 from the gaps 33 at both ends toward the center gap 34 side. As a result, the drive 1, the driven 2, and the retainer 4 are in a state of being freely movable with respect to the inner peripheral surface 31 of the housing 3.

  And since each input part 21 and 22 of the driven 2 is arrange | positioned in the circumferential direction area where each output part 11 and 12 of the drive 1 moves to a rotation direction, each output part 11 and 12 of the drive 1 is driven 2 , The rotational power of the output shaft of the motor is transmitted from the drive 1 to the driven 2 and the retainer 4, so that the drive 1 Following this, the driven 2 and the retainer 4 rotate.

In this way, when the driven 2 and the retainer 4 rotate following the drive 1 that is rotationally driven by the output shaft of the motor, the rollers 5 that are held movably in the radial direction by the concave grooves 43 and 44 of the retainer 4 are moved. It is attracted to the magnet 6. Accordingly, the roller 5 is held on the opposite side (for example, the driven 2 side) to the inner peripheral surface 31 side of the housing 3.
Then, the rotation of the driven 2 is decelerated by the speed reduction mechanism, and the opening degree of the valve arranged in the intake passage where the pressure pulsation is generated is a target position (for example, a fully open position, a fully closed position, or an intermediate position) Position).

(B) When driving force is cut off When the opening position of the valve is set to the target opening degree, the ECU stops supplying power to the motor. In this state, when a rotational force is applied to the driven 2, the roller 5 is rotated by a slight rotational change of the driven 2, so that the roller 5 has the outer peripheral surface of the driven 2, that is, the radial outer surface (plane 23) of the plurality of outer peripheral protrusions 20 The driven 2 and the housing 3 mesh with each other via the roller 5. As a result, the driven 2 cannot be rotated.

  Here, in the bidirectional clutch incorporated in the power transmission device of the present embodiment, the groove 32 is provided on the inner peripheral surface 31 of the housing 3. As a result, even when the high vibration, high load, and high pressure pulsation applied to the valve are transmitted to the driven 2 in a state where the power supply to the motor is stopped (when the driving force is cut off), Since the fitted roller 5 is prevented from moving with respect to the inner peripheral surface 31 of the housing 3 and the roller 5 meshes strongly with the housing 3, the driven 2 does not depend on the frictional force between the housing 3 and the roller 5. Can be prevented. As a result, since the rotation of the valve is blocked, it is possible to prevent a problem that the opening position of the valve changes.

[Effect of Example 1]
As described above, in the bidirectional clutch incorporated in the power transmission device of the present embodiment, the magnet 6 is installed on the radially outer surface of each outer peripheral protrusion 20 of the driven 2, and the diameter is set by the concave grooves 43 and 44 of the retainer 4. Since the roller 5 that is movably held in the direction is made of a magnetic material, each input unit 21 and 22 of the driven 2 and each input unit of the retainer 4 from each output unit 11 and 12 of the drive 1 when driving force is transmitted. When the driven 2 and the retainer 4 rotate following the drive 1 that is rotationally driven by the output shaft of the motor by receiving rotational power, the grooves 4 can be moved in the radial direction by the concave grooves 43 and 44 of the retainer 4. The roller 5 to be held is attracted to the magnet 6.

As a result, an attracting force P in a direction opposite to the centrifugal force F acts on the roller 5, so even when driving force is transmitted, the roller 5 is on the opposite side (for example, the driven 2 side) to the inner peripheral surface 31 side. The roller 5 can be held. As a result, the driven 2 and the retainer 4 smoothly rotate following the drive 1 that is rotationally driven by the output shaft of the motor without the roller 5 slidingly contacting the inner peripheral surface 31 of the housing 3.
Therefore, when the driving force is transmitted, the roller 5 is not pushed radially outward by the centrifugal force F, and the sliding contact of the roller 5 with the inner peripheral surface 31 of the housing 3 can be prevented. Further, the durability of the roller 5 can be improved by reducing the damage. Moreover, generation | occurrence | production of noises, such as an operating sound, can be suppressed.

  FIG. 5 shows a second embodiment of the present invention, FIG. 5 (a) shows the main structure of the power transmission device, and FIG. 5 (b) shows the radial position of the roller during driving force transmission. FIG.

In the two-way clutch incorporated in the power transmission device of the present embodiment, parts other than the magnet 6 of the driven 2 are made of a non-magnetic material. An axial hole 26 parallel to the axial direction of the roller 5 is formed inside each outer peripheral ridge 20 of the driven 2.
The magnet 6 is formed in a rectangular parallelepiped shape and is embedded and fixed in the axial hole 26 using an adhesive or the like.
That is, if the portion other than the magnet 6 of the driven 2 is made of a non-magnetic material, the magnetic pole surface of the magnet 6 does not need to be exposed on the surface of the driven 2 (outer peripheral surface, flat surface 23).
As described above, in the bidirectional clutch incorporated in the power transmission device of the present embodiment, the same effects as those of the first embodiment can be achieved.

[Modification]
In this embodiment, the present invention is applied to a power transmission device that transmits the rotational power of a motor that is a drive source to the shaft of a valve that is a drive target. You may apply to the power transmission device which transmits the rotational power of an engine) or a motor to the shaft of the rotating device (compressor, blower, pump, etc.) to be driven.
In this embodiment, the present invention is applied to an intake vortex generator that generates a vertical swirling flow (tumble flow) in a combustion chamber of an internal combustion engine (engine). However, the present invention is applied to the internal combustion engine (engine). The present invention may be applied to an intake vortex generator that generates a lateral swirl flow (swirl flow) in the combustion chamber. Moreover, you may apply to the intake device which can produce | generate the squish vortex for promoting combustion of an internal combustion engine (engine).

In the present embodiment, the present invention is applied to an intake vortex generator, but the present invention is applied to a throttle device that adjusts the flow rate of intake air sucked into a combustion chamber of an internal combustion engine (engine) by opening and closing operations of a throttle valve, Further, the present invention may be applied to a variable intake device that changes the length of the intake passage or the cross-sectional area of the intake passage of the internal combustion engine.
In this embodiment, the present invention is applied to a power transmission device that drives a valve body (valve to be driven) of an intake control valve that controls intake air supplied to a combustion chamber of an internal combustion engine (engine). The present invention is applied to a power transmission device that drives a valve body (valve to be driven) of an exhaust control valve that controls exhaust gas (including EGR gas) discharged from a combustion chamber of an internal combustion engine (engine). May be.

In this embodiment, the drive (driving body) 1 is constituted by a plurality (three) of driving fan sections (radial ridges) 10, but the driving body is one, two, or four or more driving fans. You may comprise by a part (radial direction protrusion).
In this embodiment, the driven (driven body) 2 is constituted by a plurality (three) of outer peripheral ridges (driven fan sections) 20, but the driven body is one, two, or four or more outer peripheral ridges. You may comprise by (follower fan part).
A plurality of driving fan portions (radial ridges) 10 and a plurality of outer peripheral ridges (driven fan portions) 20 are arranged at predetermined intervals (annular circumferential areas surrounding the periphery of the rotation center of the drive 1 in the circumferential direction). For example, it may be installed irregularly).

1 Drive (Driver)
2 Driven (follower)
3 Housing (fixed body)
4 Retainer 5 Roller 6 Magnet (magnet)
DESCRIPTION OF SYMBOLS 11 Output part of drive 12 Output part of drive 13 Engagement release protrusion 14 Engagement release protrusion 21 Driven input part 22 Driven input part 23 Driven plane (outer peripheral surface)
25 Magnetic pole surface of magnet 31 Inner peripheral surface of housing 32 Groove (dent)
33 Clearance at both ends 34 Clearance at the center 41 Input part of the retainer 42 Input part of the retainer 43 Recessed groove of the retainer 44 Recessed groove of the retainer

Claims (10)

In the power transmission device that transmits the rotational power of the drive source to the drive target,
(A) a driving body rotated by the driving source;
(B) When the rotational power of the driving source is transmitted from the driving body, a driven body that rotates following the driving body;
(C) a cylindrical fixed body that forms a radial gap between the outer periphery of the driven body and surrounds the drive body and the driven body in the circumferential direction;
(D) when the rotational power of the drive source is transmitted from the drive body, a retainer that rotates following the drive body;
(E) a roller supported so as to be movable in a radial direction with respect to the retainer,
The follower has a magnet that generates an attractive force that opposes the centrifugal force acting on the roller;
The power transmission device, wherein the roller is made of a magnetic material that can be attracted by an attracting force of the magnet. The power transmission device according to claim 1,
The drive body has an output section capable of reciprocating in an annular circumferential area surrounding the rotation center in the circumferential direction in the rotational direction of the drive body. In the power transmission device according to claim 1 or 2,
The power transmission device according to claim 1, wherein the driven body has an input unit that abuts in a circumferential direction of the driving body and receives rotational power of the driving source from the driving body. In the power transmission device according to any one of claims 1 to 3,
The power transmission device, wherein the retainer or the roller is disposed so as to be relatively rotatable with respect to the driving body or the driven body in the radial gap. In the power transmission device according to any one of claims 1 to 4,
The power transmission device, wherein the roller is rotatably supported by the retainer. In the power transmission device according to any one of claims 1 to 5,
The radial gap is characterized by having a wide central gap and an end gap that is formed at both ends in the circumferential direction of the central gap and is narrower than the central gap. Power transmission device. The power transmission device according to claim 6,
The power transmission device according to claim 1, wherein the drive body includes a mesh release protrusion that moves the roller from the end gap to the center gap by pressing the retainer in the circumferential direction. In the power transmission device according to any one of claims 1 to 7,
The power transmission device, wherein the magnet has a magnetic pole surface exposed on a surface of the follower. In the power transmission device according to any one of claims 1 to 7,
The follower is configured by a non-magnetic part other than the magnet,
The power transmission device according to claim 1, wherein the magnet is embedded and fixed in the driven body. In the power transmission device according to any one of claims 1 to 9,
The drive target is an open / close member that opens and closes a flow path in which pressure pulsation occurs.

Images