JP2008057681A - Belt transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt transmission device for an idle-stop adaptable vehicle mounted with a motor/generator, having a compact and lightweight figure. <P>SOLUTION: The belt transmission device comprises an armature 19 incorporated between the inner periphery of an outer ring 14 and the outer periphery of an inward member 12 in an axially movable manner and formed of a magnetic material, a roller 21 stored in a radial groove 20 formed in one side face of the armature 19 so as to be engaged with a cam face 18 on the outer periphery of the inward member 12 and a cylindrical face 17 on the inner periphery of the outer ring 14 when the armature 19 is joined to the outer ring 14 to give relative rotation to the outer ring 14 and the inward member 12, a switch spring 23 for elastically holding the armature 19 at an engaging position where the roller 21 contacts the cam face 18 of the inward member 12 and the cylindrical face 17 of the outer ring 14, a rotor 28 fixed to the inner periphery of the outer ring 14 and opposed to one side face of the armature 19 in the axial direction, and an electromagnet 32 opposed to the rotor 28 in the axial direction for attracting the armature 19 to the rotor 28 with energization. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a belt drive device for driving an auxiliary machine that drives an automobile auxiliary machine such as a water pump or a compressor of an air conditioner by rotating a crankshaft of an engine.

  In an automobile using an ISG (Integrated Starter Generator) system equipped with a motor / generator, the engine is started by the motor / generator, and after the engine is started, the motor / generator is switched to a power generation operation. The rotation is transmitted to the motor / generator and various auxiliary machines.

  Further, in an idling stop-compatible vehicle, when the engine is stopped, the motor / generator is switched to the starting operation, and various auxiliary machines are driven by the motor / generator.

  As a belt transmission device adopted in the above-described idle stop compatible vehicle, the one described in Patent Document 1 has been conventionally known. In this belt transmission, a crank pulley is provided on the crankshaft of the engine, the crank pulley, a generator pulley connected to the input / output shaft of the motor / generator, and an auxiliary pulley connected to the rotating shaft of the auxiliary machine. A rotation transmission device is provided between the crankshaft and the crank pulley to transmit and shut off power between the belt and the belt.

  Here, the rotation transmission device includes a roller clutch and an electromagnetic clutch that controls engagement and disengagement of the roller clutch. The rotation transmission device generates power transmitted from the motor / generator to the crank pulley by the engagement of the roller clutch. The engine is driven by transmitting it to the crankshaft.

  When the engine is driven, the rotation of the crankshaft is transmitted to the crank pulley via the roller clutch, and the rotation of the crank pulley is transmitted to the generator pulley and the auxiliary pulley via the belt. The auxiliary machine is driven.

  Further, by disengaging the roller clutch, the rotation transmission between the crankshaft and the crank pulley is interrupted to prevent the rotation of the generator pulley driven by the motor / generator from being transmitted to the crankshaft.

JP 2004-245316 A

  By the way, in the conventional rotation transmission device, since the mechanical type clutch and the electromagnetic clutch for controlling on / off of the mechanical clutch are arranged in parallel in the axial direction, The axial transmission is long and heavy, and by incorporating the rotation transmission device into the crank pulley, the belt transmission device becomes larger and heavier, reducing the size and weight of the belt transmission device. There were still points to be improved in planning.

  An object of the present invention is to reduce the size and weight of a belt transmission device of an idle stop-compatible vehicle equipped with a motor / generator.

  In order to solve the above problems, in the present invention, a crank pulley provided on the crankshaft of an engine, a generator pulley connected to an input / output shaft of a motor / generator having functions of activation and power generation, In a belt transmission device incorporating a rotation transmission device between a crankshaft and a crank pulley between a crankshaft and an auxiliary machine pulley connected to a rotation shaft of the machine, and transmitting and shutting off power. The rotation transmitting device is provided at the shaft end of the crankshaft and rotates in an integral manner with the crankshaft, an outer member fixed to the inner diameter surface of the crank pulley, an inner periphery and an inner periphery of the outer member. An armature made of a magnetic material which is incorporated between the outer peripheries of the side members and is movable in the axial direction, and is housed in a radial groove formed on one side of the armature. An engagement member coupled to one of the member and the outer member and engaged with the outer periphery of the inner member and the inner periphery of the outer member when the one member and the other member rotate relative to each other; A switch spring that elastically holds the armature at an engagement position that contacts the outer periphery of the inner member and the inner periphery of the outer member, and one of the armatures fixed to the inner periphery of the outer member or the outer periphery of the inner member. A structure comprising a rotor facing the side surface in the axial direction, and an electromagnet supported by a stationary member and facing the rotor in the axial direction and coupling the armature to one of the inner member and the outer member through the rotor when energized Was adopted.

  Here, the engagement element may be a roller or a sprag. When a roller is used as an engagement element, a cylindrical surface is formed on one of the inner periphery of the outer member and the outer periphery of the inner member, and a wedge-shaped space whose both ends in the circumferential direction are narrow between the cylindrical surface and the other. A cam surface to be formed is provided, and a roller is assembled between the cam surface and the cylindrical surface.

  On the other hand, when the sprag is used as an engagement element, a cylindrical surface is formed on the inner periphery of the outer member and the outer periphery of the inner member, and the sprag is assembled between the pair of opposing cylindrical surfaces, and the armature that holds the sprag Divide inward and outward, fix one split armature to the inner or outer member, make the other split armature rotatable relative to one split armature, and elastic force of switch spring to the other split armature And the other split armature is elastically held at a position where the sprag is engaged with the pair of cylindrical surfaces.

  Costs can be reduced by adopting a metal plate press-molded product or an aluminum or synthetic resin molded product as the engagement element.

  In the belt transmission device configured as described above, when the engine is started or restarted after idle stop, the electromagnet is energized to switch the motor / generator to the starting operation. When the electromagnet is energized, the armature is attracted to the rotor, and the engagement causes the engagement member to rotate in either the forward or reverse direction of the outer member and the inner member. It will be in the state engaged with outer periphery.

  Therefore, when the generator pulley is rotated by driving the motor / generator and the rotation is transmitted from the generator pulley to the crank pulley, the engaging element engages with the inner periphery of the outer member and the outer periphery of the inner member. By the engagement, the rotation of the crank pulley is transmitted to the inner member, the crankshaft rotates, and the engine is driven.

  When the energization of the electromagnet is interrupted after the engine is driven, the engaging element engages with the inner circumference of the outer member and the outer circumference of the inner member by the restoring elasticity of the switch spring, and only the rotation of the inner member in one direction is performed. The rotation of the inner member that rotates with the crankshaft is transmitted to the outer member from the outer member to the crank pulley, and the rotation of the crank pulley is transmitted to the generator pulley and the auxiliary pulley. Then, the motor / generator and the auxiliary machine are driven.

  Further, in the state where the energization to the electromagnet is cut off, the engaging element is in a state of transmitting only rotation in one direction. Therefore, when the engine is idle-stopped and the motor / generator is driven, the generator pulley rotates from the generator pulley. Even if it is transmitted, it is not transmitted to the crankshaft, the crank pulley rotates freely, and the rotation is transmitted from the generator pulley to the accessory pulley to drive the accessory.

  Here, when the rotation transmission device is used under lubrication with oil, grease, etc., the viscosity of the lubricant interposed between the rotor and the armature may cause the armature to be held in the attracted state by the rotor, which may cause malfunction. There is. In order to prevent the occurrence of the malfunction, it is preferable to urge the armature in a direction away from the rotor by incorporating a separation spring between the opposed surfaces of the rotor and the armature. In this case, the axial length can be reduced by providing the rotor with a recess that accommodates a part of the separation spring.

  As described above, in the present invention, since the energization of the electromagnet is interrupted, the engagement element is in a state of transmitting only the rotation of the inner member in one direction to the outer member. And the auxiliary machine can be driven, and the energization of the electromagnet causes the engagement member to rotate in the forward or reverse direction of the outer member and the inner member, and the inner circumference of the outer member and the inner member of the inner member. Since the engine is engaged with the outer periphery, the engine can be driven by the motor / generator, and the accessory can be driven when the engine is idling.

  Further, since the rotational torque is transmitted through the engagement element, a rotation transmission device having a large torque capacity can be obtained.

  In particular, the rotation transmission device incorporated in the crank pulley has an armature with a small number of parts in which the armature holding the engaging element and the rotor are arranged opposite to each other in the axial direction, and the electromagnet is arranged opposite to the rotor in the axial direction. Since it is a small, compact and lightweight construction with a short directional length, a lightweight belt transmission device with a compact axial length can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 (a) and 1 (b) schematically show a belt transmission device according to the present invention. As shown in the figure, a crank pulley 3 is provided coaxially with the crankshaft 2 of the engine 1, and a generator pulley 6 attached to the crank pulley 3 and the input / output shaft 5 of the motor / generator 4 and a compressor or the like are supplemented. A belt 10 is stretched between pulleys 9 attached to the rotary shaft 8 of the machine 7.

  As shown in FIGS. 2 (c) and 2 (d), between the crankshaft 2 and the crank pulley 3, there is a rotation transmission device 11 that transmits and blocks rotational torque between the crankshaft 2 and the crank pulley 3. It is incorporated.

  As shown in FIGS. 2 and 3, the rotation transmission device 11 has a shaft-shaped inner member 12 connected to the shaft end portion of the crankshaft 2, and a large-diameter portion provided on the inner member 12. An outer ring 14 as an outer member is provided so as to cover 13.

  The outer ring 14 has an end plate 15. The outer ring 14 is press-fitted into the inner diameter surface of the crank pulley 3 and arranged coaxially with the inner member 12 and is rotatably supported by a bearing 16 provided at the end of the inner member 12.

  A cylindrical surface 17 is formed on the inner periphery of the outer ring 14. On the other hand, a narrow wedge-shaped space is formed on the outer periphery of the large-diameter portion 13 of the inner member 12 between the cylindrical surface 17 and both ends in the circumferential direction. A plurality of cam surfaces 18 are provided at equal intervals in the circumferential direction.

  An armature 19 is incorporated between the outer periphery of the large diameter portion 13 and the inner periphery of the outer ring 14. The armature 19 is made of a magnetic material, and a plurality of radial grooves 20 are formed at equal intervals on one side surface of the armature 19, and a roller 21 as an engaging element is incorporated in each radial groove 20.

  The roller 21 has a disk shape. Since this roller 21 transmits rotational torque between the inner member 12 and the outer ring 14 by engaging the cylindrical surface 17 of the outer ring 14 and the cam surface 18 of the large-diameter portion 13, depending on the magnitude of the transmitted torque. The material is determined appropriately.

  For example, when a large torque is transmitted, a high hardness is required, and therefore, it is formed of a magnetic material such as iron. At this time, the roller 21 may be formed by cutting. Or you may form by press punching.

  On the other hand, when transmitting a small torque, the roller 21 may be formed of a nonmagnetic material such as aluminum or synthetic resin. In this case, since the roller 21 can be formed by molding, a low-cost roller 21 can be obtained.

  In the large diameter portion 13, a spring accommodating recess 22 is formed on the side surface on the shaft end side of the inner member 12, and a switch spring 23 is incorporated in the spring accommodating recess 22.

  The switch spring 23 has a C shape, and a pair of pressing pieces 23 a and 23 b are provided outward at both ends. One pressing piece 23 a is inserted into a notch 24 formed in the peripheral wall of the spring housing recess 22. The one end surface of the notch 24 is pressed toward one side in the circumferential direction.

  The other pressing piece 23b is inserted into the notch 25 provided in the armature 19 from the notch 24 and presses the other end surface of the notch 25 toward the other in the circumferential direction. Thus, the armature 19 is elastically held so that the roller 21 is engaged with the cylindrical surface 17 and the cam surface 18.

  An annular stopper plate 26 is fitted to the shaft end portion of the inner member 12, and the stopper plate 26 abuts against the side surface of the large-diameter portion 13 by a retaining ring 27 attached to the shaft end portion of the inner member 12. Held in a state. The stopper plate 26 closes the opening of the spring housing recess 22 to prevent the switch spring 23 from coming out of the opening of the spring housing recess 22. In addition, the stopper plate 26 separates the armature 19 from the rotor 28 so that a gap less than the thickness of the roller 21 is secured between the armature 19 and the rotor 28 in a state where the armature 19 is separated from the rotor 28 described later. Is limiting.

  A rotor 28 made of a magnetic material is provided on the other side of the armature 19. The rotor 28 has cylindrical portions 28 a and 28 b facing in the same direction on the outer periphery and the inner periphery, and the outer cylindrical portion 28 a is press-fitted into the opening end portion of the outer ring 14 and integrated with the outer ring 14.

  Here, when the outer ring 14 is made of a magnetic material, a cylindrical rotor guide made of a non-magnetic material is connected to the opening end of the outer ring 14, and the outer cylindrical portion 28a of the rotor 28 is press-fitted into the rotor guide. Magnetic leakage from the rotor 28 to the outer ring 14 may be prevented.

  The inner cylindrical portion 28 b of the rotor 28 is rotatably supported by a bearing 29 provided outside the inner member 12.

  An annular recess 30 is formed on the surface of the rotor 28 facing the armature 19, and a separation spring 31 incorporated in the recess 30 urges the armature 19 in a direction away from the rotor 28.

  An electromagnet 32 is incorporated between the outer cylindrical portion 28 a and the inner cylindrical portion 28 b of the rotor 28. The electromagnet 32 includes an electromagnetic coil 32a and a core 32b that supports the electromagnetic coil 32a. The core 32b is supported by a stationary member 33 and is fixedly arranged.

  The belt transmission apparatus shown in the embodiment has the above-described structure, and when the engine 1 is started or restarted after an idle stop, the electromagnetic coil 32a of the electromagnet 32 is energized to switch the motor / generator 4 to the starting operation. When the electromagnetic coil 32a is energized, a magnetic flux flows through the core 32b, the armature 19 and the rotor 28 as shown by a chain line (a) in FIG. By the suction, the roller 21 is engaged with the cylindrical surface 17 of the outer ring 14 and the cam surface 18 of the inner member 12 even if the outer ring 14 and the inner member 12 are rotated relative to each other.

  Therefore, when the motor / generator 4 is driven, the generator pulley 6 is rotated in the direction of the arrow shown in FIG. 1A, and when rotation is transmitted from the generator pulley 6 to the crank pulley 3, the generator pulley 6 is press-fitted into the crank pulley 3. The relative rotation between the outer ring 14 and the inner member 12 causes the roller 21 to engage the cylindrical surface 17 of the outer ring 14 and the cam surface 18 of the inner member 12 as shown in FIG. By the engagement, the rotation of the crank pulley 3 is transmitted to the inner member 12, the crankshaft 2 is rotated, and the engine is driven.

  Further, when the outer ring 14 and the inner member 12 are relatively rotated, the switch spring 23 is elastically deformed to reduce the diameter.

  When the energization of the electromagnetic coil 32a of the electromagnet 32 is interrupted after the engine 1 is driven, the armature 19 rotates relative to the inner member 12 by the restoring elasticity of the switch spring 23, and as shown in FIG. 21 is engaged with the cylindrical surface 17 of the outer ring 14 and the cam surface 18 of the inner member 12, and only the rotation of the inner member 12 in the direction indicated by the arrow is transmitted to the outer ring 14 and rotates together with the crankshaft 2. The rotation of the inner member 12 is transmitted to the outer ring 14 and the crank pulley 3 via the roller 21, and the rotation of the crank pulley 3 is transmitted to the generator pulley 6 and the auxiliary pulley 9. 7 is driven.

  In the state where the energization of the electromagnet 32 to the electromagnetic coil 32a is interrupted, the roller 21 is in a state of transmitting only rotation in one direction. Therefore, when the engine 1 is idled and the motor / generator 4 is driven, the generator pulley is driven. 6, even if rotation is transmitted to the crank pulley 3, it is not transmitted to the crankshaft 2, the crank pulley 3 rotates freely, and rotation is transmitted from the generator pulley 6 to the auxiliary pulley 9 to drive the auxiliary 7. Is done.

  As described above, since the roller 21 is in a state of transmitting only the rotation of the inner member 12 in one direction to the outer ring 14 by cutting off the energization of the electromagnetic coil 32a of the electromagnet 32, the rotation of the crankshaft 2 causes the motor The generator 4 and auxiliary equipment can be driven. Further, by energizing the electromagnetic coil 32 a, the roller 21 engages with the cylindrical surface 17 of the outer ring 14 and the cam surface 18 of the inner member 12 even if the roller 21 rotates relative to the forward or reverse direction of the outer ring 14 and the inner member 12. Therefore, the engine 1 can be driven by the motor / generator 4 and the auxiliary machine 7 can be driven when the engine 1 is idling.

  Further, since the rotational torque is transmitted via the roller 21, the rotational transmission device 11 having a large torque capacity can be obtained.

  Further, the rotation transmission device 11 incorporated in the crank pulley 3 arranges the armature 19 holding the roller 21 and the rotor 28 in the axial direction, and arranges the electromagnet 32 in the axial direction with respect to the rotor 28. Since it is a small, compact and lightweight configuration with a small number of parts and a short axial length, a belt transmission device having a compact axial length and a light weight can be obtained.

  FIGS. 6E and 6F show another example of the rotation transmission device 11. In this example, a cam surface 34 is provided on the inner periphery of the outer ring 14, and a cylindrical surface 35 is formed on the outer periphery of the large-diameter portion 13. In this case, the inner cylindrical portion 28 b of the rotor 28 is press-fitted into the inner member 12, the rotor 28 is fixed to the inner member 12, and the outer cylindrical portion 28 a of the rotor 28 is incorporated into the opening end portion of the outer ring 14. The bearing 36 is rotatably supported.

  Further, the switch spring 23 is accommodated in a recess 37 formed on the surface of the armature 19 facing the stopper plate 26, and one of the pair of pressing pieces 23a and 23b provided at both ends of the switch spring 23 is provided with one pressing piece 23a. Inserted into the notch 38 formed in the armature 19 and pressed one end surface of the notch 38 in the circumferential direction, and the other pressing piece 23b was formed from the notch 38 to the inner periphery of the outer ring 14. The armature 19 is inserted into the notch 39 and the other end surface of the notch 39 is pressed toward the other end in the circumferential direction so that the roller 21 is engaged with the cam surface 34 and the cylindrical surface 35. Holds elastic.

  In the rotation transmission device 11 configured as described above, the electromagnetic coil 32a of the electromagnet 32 is energized and the armature 19 is attracted to the rotor 28, and the motor / generator 4 is driven to connect the crank pulley 3 to the arrow in FIG. When the outer ring 14 and the armature 19 rotate relative to each other, the switch spring 23 is elastically deformed and the roller 21 is engaged with the cam surface 34 and the cylindrical surface 35. By the engagement, the rotation of the crank pulley 3 is transmitted to the inner member 12, the crankshaft 2 is rotated, and the engine 1 is driven.

  When the energization of the electromagnetic coil 32a is released after the engine 1 is started, the armature 19 is rotated by the restoring elasticity of the switch spring 23, so that the roller 21 is one of the inner members 12 as shown in FIG. Only the rotation in the direction can be transmitted to the crank pulley 3, and the rotation of the inner member 12 is transmitted to the outer ring 14 and the crank pulley 3 through the roller 21, and the motor / generator 4 and the auxiliary machine 7 are driven. Is done.

  FIGS. 7G and 7H show still another example of the rotation transmission device 11. In this example, the outer periphery of the large-diameter portion 13 and the inner periphery of the outer ring 14 are cylindrical surfaces 40 and 41, and a sprag 42 as an engaging element is incorporated between the cylindrical surfaces 40 and 41.

  Here, the sprag 42 is made of a plate, has a low height in the standing state, and gradually increases in height by rotating around the center of gravity, and arc-shaped surfaces 42 a and 42 b provided at both ends are formed on the cylindrical surfaces 40 and 41. It is designed to engage. Further, the arcuate surfaces 42 a and 42 b at both ends in the standing state are in a neutral position where they are not engaged with the cylindrical surfaces 40 and 41.

  Further, the armature 19 is divided into two split armatures 19a and 9b having different diameters, and the split armature 19b on the small diameter side is fixed to the large diameter portion 13, and the split armature 19b on the large diameter side is fixed to the split armature 19b on the small diameter side. The split armature 19a is rotatable.

  Further, one pressing piece 23a of the pressing pieces 23a and 23b provided at both ends of the switch spring 23 is inserted into the notch 43 formed in the small-diameter side split armature 19b, and one end surface of the notch 43 is inserted. The other pressing piece 23b is inserted into the notch 44 provided in the split armature 19a on the large diameter side from the notch 43, and the other end surface of the notch 44 is circumferentially pressed. The split armature 19a on the large diameter side is elastically held at a position where the arc-shaped surfaces 42a and 42b of the sprag 42 are engaged with the cylindrical surfaces 40 and 41 by the pressing.

  In the rotation transmission device configured as described above, when the engine 1 is started or restarted after an idle stop, the electromagnetic coil 32a of the electromagnet 32 is energized, and the motor / generator 4 is switched to the starting operation.

  When the electromagnetic coil 32 a is energized, the large-diameter divided armature 19 a is attracted to the rotor 28. When the crank pulley 3 is rotated in the direction indicated by the arrow in FIG. 7 by driving the motor / generator 4 in the attracted state, the large-diameter divided armature 19a and the small-diameter-side divided fixed to the inner member 12 are used. The relative rotation of the armature 19b causes the sprag 42 to rotate and tilt around the center of gravity, and the arcuate surfaces 42a and 42b at both ends engage with the cylindrical surfaces 40 and 41 as shown in FIG. By the engagement, the rotation of the crank pulley 3 is transmitted to the inner member 12, the crankshaft 2 is rotated, and the engine is driven.

  Further, when the large-diameter-side split armature 19a and the small-diameter-side split armature 19b rotate relative to each other, the switch spring 23 is elastically deformed to reduce the diameter.

  When the energization of the electromagnetic coil 32a of the electromagnet 32 is interrupted after the engine 1 is driven, the split armature 19a on the large diameter side rotates relative to the split armature 19b on the small diameter side due to the restoring elasticity of the switch spring 23, and the sprag 42 As shown in FIG. 7 (h), the arcuate surfaces 42a and 42b at both ends engage with the cylindrical surfaces 40 and 41, and only the rotation of the inner member 12 in the direction indicated by the arrow is performed. 14, and the rotation of the inner member 12 rotating together with the crankshaft 2 is transmitted to the outer ring 14 and the crank pulley 3 via the sprag 42, and the rotation of the crank pulley 3 is generated by the generator pulley 6 and the auxiliary machine. Transmission to the pulley 9 drives the motor / generator 4 and the auxiliary machine 7.

  Further, in a state where the energization of the electromagnet 32 to the electromagnetic coil 32a is interrupted, the sprag 42 is in a state in which only the rotation of the inner member 12 in one direction is transmitted to the crank pulley 3. Therefore, the engine 1 is idled and the motor / generator is stopped. 4 is driven, even if rotation is transmitted from the generator pulley 6 to the crank pulley 3, it is not transmitted to the crankshaft 2, the crank pulley 3 rotates freely, and the generator pulley 6 rotates to the auxiliary pulley 9. Then, the auxiliary machine 7 is driven.

  Each of the rotation transmission devices 11 shown in FIG. 6 and FIG. 7 is configured to hold the roller 21 and the sprag 42 as the engaging members by the armature 19 that is attracted to the rotor 28, and thus is small and compact with a short axial length. A lightweight rotation transmission device can be obtained. For this reason, by incorporating the rotation transmission device 11 into the crank pulley 3, it is possible to obtain a belt transmission device having a small axial length and a light weight.

  In the rotation transmission device shown in FIG. 7, the split armature 19a on the large diameter side may be fixed to the outer ring 14, and the split armature 19b on the small diameter side may be rotated to lock the switch spring 23. In this case, the rotor 28 is fixed to the inner member 12.

(A) is a schematic front view which shows embodiment of the belt transmission apparatus which concerns on this invention, (b) is a side view of (a). (c) is a sectional view showing a rotation transmission device incorporated in a crank pulley, (d) is a sectional view taken along line II-II in (c). Sectional drawing which expands and shows a part of FIG.2 (c) Sectional view showing armature adsorption state Sectional drawing which shows the engagement state of the roller at the time of engine starting (E) is sectional drawing which shows the other example of a rotation transmission apparatus, (f) is sectional drawing along the VI-VI line of (e). (G) is a sectional view showing still another example of the rotation transmission device, (h) is a sectional view taken along line VII-VII in (g). Sectional view showing engagement state of sprag at engine start

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Crankshaft 3 Crank pulley 4 Motor generator 5 Input / output shaft 6 Generator pulley 7 Auxiliary machine 8 Rotating shaft 9 Auxiliary machine pulley 10 Belt 11 Rotation transmission device 12 Inner member 14 Outer ring (outer member)
17 cylindrical surface 18 cam surface 19 armature 19a split armature 19b split armature 20 radial groove 21 roller (engagement element)
23 Switch spring 28 Rotor 30 Recess 31 Separation spring 32 Electromagnet 33 Static member 34 Cam surface 35 Cylindrical surface 40 Cylindrical surface 41 Cylindrical surface 42 Sprag

Claims (7)

A belt between a crank pulley provided on the crankshaft of the engine, a generator pulley connected to an input / output shaft of a motor / generator having functions of generating and generating power, and an auxiliary pulley connected to a rotating shaft of the auxiliary machine In a belt transmission device incorporating a rotation transmission device that performs transmission and interruption of power between the crankshaft and the crank pulley,
The rotation transmission device is provided at the shaft end of the crankshaft and rotates integrally with the crankshaft, an outer member fixed to the inner diameter surface of the crank pulley, an inner periphery of the outer member, An armature made of a magnetic material that is incorporated between the outer peripheries of the inner members and movable in the axial direction, and is housed in a radial groove formed on one side of the armature, and the armatures are inner members and outer members. An engaging member that engages with the outer periphery of the inner member and the inner periphery of the outer member when the one member and the other member rotate relative to each other, and the engaging member of the inner member A switch spring that elastically holds the armature in an engagement position that contacts the outer periphery and the inner periphery of the outer member, and is fixed to the inner periphery of the outer member or the outer periphery of the inner member so as to be axially aligned with one side surface of the armature Opposed rotor and supported by stationary member Are opposite in the rotor in the axial direction, belt drive system, characterized in that it consists an electromagnet to couple the armature one to the inner member and the outer member through the rotor by energizing.   A cylindrical surface is formed on one of the outer periphery of the inner member and the inner periphery of the outer member, and a cam surface is formed on the other side to form a narrow wedge-shaped space between both ends of the cylindrical surface. The belt transmission device according to claim 1, wherein an engaging member made of a roller is engaged and disengaged with respect to the cam surface and the cylindrical surface.   A cylindrical surface is formed on each of the outer periphery of the inner member and the inner periphery of the outer member, and an engagement element that engages and disengages from both cylindrical surfaces is a sprag, and the radial direction for accommodating the sprag The armature having a groove is divided inward and outward, one split armature is fixed to the inner member or the outer member, the other split armature is rotatable with respect to one split armature, and the other split 2. The belt transmission device according to claim 1, wherein an elastic force of a switch spring is applied to the armature, and the other split armature is elastically held at a position where the sprag is engaged with the cylindrical surface.   The belt transmission device according to any one of claims 1 to 3, wherein the engagement element is formed of a press-formed product.   The belt transmission device according to claim 1, wherein the engagement element is formed of a molded product of aluminum or synthetic resin.   The belt transmission device according to any one of claims 1 to 5, wherein a separation spring is provided between the opposing surfaces of the armature and the rotor to urge the armature in a direction away from the rotor.   The belt transmission device according to claim 6, wherein the rotor is provided with a recess for accommodating a part of the separation spring.

Images