JP2016033380A - Continuously variable transmission actuator and continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a configuration facilitating assembly and disassembly of an actuator, and improving durability of the actuator.SOLUTION: A continuously variable transmission actuator is configured so that an engagement shaft member 25 and an engagement portion 26 protruding radially from the engagement shaft element 25 are formed in one of a coupling member 24 driven axially by a driving force of a motor 10 and an arm 31 driving a movable sheave 4 of a pulley 2, the engagement shaft element 25 extending to face the other, i.e., the coupling member 24 or the arm 31, a guide groove 32 guiding the engagement portion 26 in an axial direction of the engagement shaft element 25 and a locking groove 33 communicating with a groove bottom of the guide groove 32 and extending in a direction in which the engagement shaft element 25 rotates about an axis are formed in the other, i.e., the coupling member 24 or the arm 31, and the coupling member 24 and the arm 31 rotate relatively about the axis so as to fit the engagement portion 26 into the locking groove 33 after inserting the engagement portion 26 into the guide groove 32 to reach the bottom groove.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a continuously variable transmission actuator and a continuously variable transmission used in a vehicle such as a small motorcycle.

  The continuously variable transmission has a driving pulley, a driven pulley, and a transmission belt wound between both pulleys, and changes the distance between a fixed sheave and a movable sheave that respectively constitute both pulleys. The gear ratio can be adjusted steplessly by continuously changing the winding diameter of the transmission belt wound around the pulley and the driven pulley.

  In order to bring this movable sheave into and out of contact with the fixed sheave, for example, as shown in Patent Document 1, a centrifugal roller type drive mechanism may be employed. In this drive mechanism, as shown in FIG. 3 and the like of this document, when the rotation of the output shaft increases, the centrifugal roller 3 moves outward by centrifugal force, and the clutch plate 8 is moved against the urging force of the spring 10. Press against the pulley 1a (movable sheave) side. By the pressing of the pulley 1a, the interval between the pulleys 1 (between the movable sheave and the fixed sheave) is narrowed, and the gear ratio is changed.

  Since this centrifugal roller type drive mechanism indirectly drives the pulley by the centrifugal roller moved by the action of centrifugal force, for example, if a malfunction such as being caught in the movement of the centrifugal roller occurs, high driving accuracy of the pulley can be obtained. I can't. In this case, there is a problem that the optimum gear ratio cannot be obtained in accordance with the engine speed and speed, and a sufficient fuel efficiency improvement effect in the drive system cannot be obtained. Therefore, Patent Documents 2 and 3 employ a configuration in which the movable sheave is not directly driven by a centrifugal roller, but directly driven by an actuator using a motor as a drive source.

  The continuously variable transmission according to Patent Document 2 rotates the nut member 107 by rotating the rotating shaft 102a of the motor 102 about the axis as described in FIG. When the nut member 107 is rotated, the screw shaft 111 that meshes with the nut member 107 is displaced in the axial direction. As the screw shaft 111 is displaced, the pressing member 117 is also displaced in the same direction, and the fork member 300 is rotated in a predetermined direction. With this rotation, the movable sheave 207 is pressed and the movable sheave 207 approaches the fixed sheave 203.

  As described in FIG. 4 and the like of this document, the continuously variable transmission according to Patent Document 3 drives the output shaft 91 by the actuator unit 90 and moves the arm member 120 in the driving direction to move the movable pulley. 62 is moved. The arm member 120 is connected to the output shaft 91 of the actuator unit 90 via the connecting member 130.

JP 2004-257458 A JP 2009-79759 A Japanese Patent No. 5241642

  In the configuration according to Patent Document 2, the screw shaft 111 is used for driving in the axial direction, and this screw shaft 111 prevents relative rotation while allowing relative movement in the axial direction in the screw shaft chamber 101b. In order to do so, a detent must be provided (see paragraph 0046 of this document). Therefore, there is a problem that the configuration of the actuator becomes complicated. Further, since the mechanism is driven by the rotation of the screw shaft 111, a moment accompanying the rotation is applied to the surrounding members, and there is a possibility that the life of the members may be shortened.

  Further, in the configuration according to Patent Document 3, the actuator unit 90 and the arm member 120 must be attached and detached each time assembly is performed and parts are replaced. This attachment / detachment is performed by hooking or removing the hook part 133 provided at the tip of the output shaft 91 of the actuator unit 90 to or from the pin 124 attached to the arm member 120 side. It must be slid from the side (from the right side of FIG. 4 of this document), and in order to perform this operation, it is necessary to provide a certain gap between the pin 124 and the hook portion 133. For this reason, the actuator unit 90 may be hindered in size.

  A configuration in which the pin 124 and the hook portion 133 are integrated from the beginning is also conceivable. In this case, although the ease of assembly is improved, there is a problem that it takes time to work when it is necessary to disassemble the actuator during maintenance. .

  Accordingly, an object of the present invention is to make it possible to easily assemble and disassemble the actuator and to improve its durability.

  In order to solve this problem, in the present invention, a pulley having a fixed sheave and a movable sheave paired with the fixed sheave, an actuator that makes the movable sheave contact and separate in the axial direction with respect to the fixed sheave, An actuator for continuously variable transmission comprising: a rotating member that is rotated by a driving force of a motor; a displacement member that is axially displaced by the rotation of the rotating member; and a connecting member that is attached to the displacement member. A guide member that guides the connecting member in an axial direction while preventing the connecting member from rotating about an axis, and an arm connected between the connecting member and the movable sheave, and one side of the connecting member or the arm. Is an engagement shaft extending so as to face the other side of the connecting member or the arm, and a engagement projecting radially from the engagement shaft. And the other side of the connecting member or the arm communicates with a guide groove for guiding the engaging portion in the axial direction of the engaging shaft body and a groove bottom of the guiding groove, and A locking groove extending in the rotational direction around the axis of the coaxial body, and inserting the engaging portion to the groove bottom of the guide groove, and then connecting the connecting member and the arm around the axis. The actuator for a continuously variable transmission is configured such that the engaging portion fits into the locking groove by relative rotation.

  In this way, by guiding the connecting member attached with the displacement member with the guide member so as not to rotate around the axis, it is not necessary to separately provide a member for preventing rotation. For this reason, the structure of an actuator can be simplified. In addition, the engaging member on the other side is fitted into the locking groove on one side of the connecting member or the arm, so that the connecting member and the arm are reliably engaged. For this reason, the movable sheave can be smoothly brought into and out of contact with the fixed sheave by driving the actuator.

  The engagement between the connecting member and the arm is performed by relatively rotating both of them around the axis by a predetermined angle. Further, the engagement is released by relatively rotating the two by a predetermined angle in the opposite directions around the axis. Thus, since both can be attached and detached only by relatively rotating around the axis, the assembly and disassembly of the actuator can be performed smoothly.

  In the above configuration, it is preferable that the rotating member is a ball screw shaft and the displacement member is a ball screw nut. This actuator is required to have high controllability to accurately stop at a predetermined position within the range of this linear motion in response to ON / OFF of the driving force of the motor while converting the rotational motion to linear motion. By using a ball screw shaft as the rotating member and using a ball screw nut as the displacing member, it is possible to achieve both conversion of rotational motion into linear motion and high controllability of the stop position.

  In each of the above-described configurations, it is preferable that two or more engagement portions are formed in a rotationally symmetrical manner around the axis of the engagement shaft body. By forming two or more engaging portions, the connecting member and the arm can be reliably connected without rattling.

  In each of the above configurations, it is preferable to further include a planetary speed reducer or a parallel shaft speed reducer that decelerates the rotation of the motor and transmits it to the rotating member. Thus, by using various reduction gears, the speed change ratio of the pulley can be changed smoothly by rotating the rotating member around the axis at an appropriate speed.

  In each of the above configurations, it is preferable that a double-row angular ball bearing or a deep groove ball bearing is provided between the movable sheave and the arm. As described above, by providing various bearings, the movable sheave can be freely rotated around the axis while applying a pressing force for moving the movable sheave to the fixed sheave from the arm to the movable sheave. The number of bearings is preferably 1 to 2, but the number can be changed as appropriate.

  In each said structure, it is preferable to set it as the structure which supports the said rotation member with a 4-point contact ball bearing or a deep groove ball bearing. Thus, by providing various bearings, the rotating member can be stably rotated around its axis. The number of bearings is preferably 1 to 2, but the number can be changed as appropriate.

  By applying the continuously variable transmission actuator according to each of the above configurations to a continuously variable transmission, it is possible to achieve an optimal gear ratio corresponding to the rotational speed and speed of the engine mounted on the vehicle, which is high in the drive system. A fuel efficiency improvement effect can be obtained.

  According to the present invention, an actuator for continuously variable transmission, comprising: a pulley having a fixed sheave and a movable sheave that forms a pair with the fixed sheave; and an actuator that makes the movable sheave contact and separate in the axial direction with respect to the fixed sheave. The actuator includes: a rotating member that rotates about an axis by a driving force of a motor; a displacement member that converts a rotation amount of the rotating member into an axial displacement amount; A connecting member to be attached; a guide member that guides the connecting member in an axial direction while preventing the connecting member from rotating about an axis; and an arm that is fixed to the connecting member and biases the movable sheave toward the fixed sheave. An actuator for continuously variable transmission was constructed.

  Further, an engagement shaft body extending on one side of the connection member or the arm so as to face the other side of the connection member or the arm, and a rotationally symmetric shape projecting radially from the engagement shaft body An engaging portion, and communicated with a guide groove for guiding the engaging portion in the axial direction of the engaging shaft body on the other side of the connecting member or the arm, and a groove bottom of the guiding groove, And a locking groove extending in the rotational direction around the axis of the engagement shaft body.

  According to this configuration, since the connecting member to which the displacement member is attached is guided by the guide member so as not to rotate around the axis, it is not necessary to separately provide a member for preventing the connecting member from rotating. For this reason, the structure of an actuator can be simplified. In addition, this guide member takes a moment to rotate the displacement member (and the connecting member) and does not affect the surrounding members. For this reason, the lifetime of this member can be extended, and the actuator can be stably operated over a long period of time.

  In addition, by inserting the engaging portion to the bottom of the guide groove, the connecting member and the arm are rotated relative to each other around the axis so that the engaging portion is fitted in the locking groove. Both can be easily and reliably connected. Furthermore, the connection can be easily released by relatively rotating both in the opposite directions around the axis. For this reason, the assembly and disassembly of the actuator can be easily performed.

A longitudinal sectional view showing a continuously variable transmission according to the present invention 1A and 1B show connection members used in the actuator of the continuously variable transmission shown in FIG. 1, (a) is a front view, (b) is a left side view, (c) is a right side view, and (d) is a plan view. 2 is a longitudinal sectional view showing a state in which the connecting member shown in FIG. 2 is fixed to the ball screw nut. The guide member used for the actuator of the continuously variable transmission shown in FIG. 1 is shown, (a) is a bottom view, (b) is sectional drawing which follows the bb line in (a). The connection member and arm which are shown in FIG. 2 are shown, (a) is an exploded perspective view, (b) is a side view of the main part.

  A longitudinal sectional view of a continuously variable transmission according to the present invention is shown in FIG. The continuously variable transmission includes a main driving shaft 1 connected to the output shaft side of the engine, a main driving side pulley 2 provided on the main driving shaft 1, and a fixed sheave 3 and a movable sheave 4 that constitute the main driving side pulley 2. An actuator 5 that is separated, a driven shaft 6 that transmits power to the wheels, a driven pulley 7 provided on the driven shaft 6, and a transmission belt 8 that transmits the rotational force of the driven pulley 2 to the driven pulley 7. It is a major component.

  Opposed tapered surfaces are respectively formed on the fixed sheave 3 and the movable sheave 4 that constitute the main pulley 2. By moving the movable sheave 4 in the axial direction with respect to the fixed sheave 3, the distance between the sheaves 3 and 4 changes, and the rotation radius of the transmission belt 8 driven by the main driving pulley 2 is continuously changed. Can be changed.

  The configuration of the actuator 5 will be described. A motor 10 is provided in the motor case 9 of the continuously variable transmission, and an output gear 11 provided on the output shaft of the motor 10 meshes with a gear of a parallel shaft reducer 13 housed in a reducer case 12. Yes. The parallel shaft speed reducer 13 includes a first gear 14 that meshes with the output gear 11, a second gear 16 that is attached to the same rotation shaft 15 as the first gear 14, and a third gear 17 that meshes with the second gear 16. Consists of The first gear 14, the second gear 16, and the third gear 17 are all spur gears. The rotating shaft 15 to which the first gear 14 and the second gear 16 are attached is supported by a shell bearing 18 so as to be rotatable around the shaft.

  A holding shaft body 19 is fitted in the center of the third gear 17. The holding shaft body 19 is supported by two four-point contact ball bearings 20 and 20 so as to be rotatable around the axis. Instead of using the four-point contact ball bearing 20, a deep groove ball bearing can also be used. Further, the number of bearings 20 is not limited to two, and may be one. A ball screw shaft 21 a as a rotating member 21 is fitted into the end of the holding shaft 19 opposite to the end fitted into the third gear 17. A fixing member 22 is inserted into the ball screw shaft 21a in a direction perpendicular to the axial direction of the ball screw shaft 21a, and the holding shaft body 19 and the ball screw shaft 21a rotate together around the axis by the fixing member 22. ing.

  The ball screw shaft 21 a is provided with a ball screw nut 23 a as a displacement member 23. A male screw groove is formed on the outer peripheral surface of the ball screw shaft 21a, and a female screw groove is formed on the inner peripheral surface of the ball screw nut 23a at the same pitch as that of the male screw groove. Yes. Further, a circulation path (not shown) is formed in the ball screw nut 23a from one end side to the other end side of the ball screw nut 23a and facing both the grooves at both ends. As the ball circulates through the gap between the grooves and the circulation path, the ball screw nut 23a is displaced relative to the ball screw shaft 21a in the axial direction as the ball screw shaft 21a rotates. To do.

  Thus, by adopting the ball screw shaft 21a as the rotating member 21 and the ball screw nut 23a as the displacing member 23, it is possible to achieve both the conversion of the rotary motion to the linear motion and the high controllability of the stop position. However, instead of the ball screw shaft 21a and the ball screw nut 23a, a sliding screw may be used as the rotating member 21, and a sliding nut may be used as the displacement member 23, respectively.

  A connecting member 24 shown in FIG. 2 is fixed to the ball screw nut 23a. The connecting member 24 is a U-shaped plate-like member, and an engagement shaft body 25 is extended so as to face an arm 31 described later. On the peripheral surface of the engagement shaft body 25, three 120 degree rotationally symmetric engagement portions 26 protrude outward in the radial direction.

  As shown in FIG. 3, the ball screw nut 23 a is integrally fixed with a screw 28 screwed into a screw hole 27 formed in the connecting member 24. The connecting member 24 is fitted into a notch groove 30 formed in the guide member 29 shown in FIG. The guide member 29 is fixed to the speed reducer case 12.

  When the ball screw shaft 21a is rotated around the axis by driving the motor 10, the ball screw nut 23a provided on the ball screw shaft 21a rotates relative to the ball screw shaft 21a around the axis. The ball screw nut 23 a is fixed by a connecting member 24, and the connecting member 24 is fitted into a guide member 27 fixed to the speed reducer case 12, and the ball screw nut 23 a is attached to the speed reducer case 12. On the other hand, it advances and retreats in the axial direction (the direction of the arrow shown in FIG. 1) without rotating around the axis.

  As shown in FIG. 5, a guide groove 32 that guides the engaging portion 26 in the axial direction of the engaging shaft body 25 is formed on one end side of the arm 31. Further, a locking groove 33 is formed which communicates with the groove bottom of the guide groove 32 and extends in the rotation direction around the axis of the engagement shaft body 25. When the engaging portion 26 is inserted to the bottom of the guide groove 32 and the connecting member 24 and the arm 31 are rotated relative to each other around the axis, the engaging portion 26 is fitted into the locking groove 33, The arm 31 is connected and integrated.

  On the other hand, when the connecting member 24 and the arm 31 are rotated relative to each other in the reverse direction, the engagement portion 26 is not fitted into the locking groove 33 and the connecting member 24 and the arm 31 are separated. State. Thus, since the connection member 24 and the arm 31 can be connected and separated by relative rotation, the assembly and disassembly of the actuator 5 can be performed smoothly. Moreover, since it is not necessary to secure a space around the connecting member 24 and the arm 31 in order to perform this operation, the actuator 5 can be downsized.

  Although FIG. 5 etc. showed about the example which formed the three engaging parts 26 in the surrounding surface of the engagement shaft 25, if the number of the engaging parts 26 is two or more, it will not specifically limit. In addition, each engagement portion 26 is preferably formed at a rotationally symmetric position on the peripheral surface of the engagement shaft body 25 as shown in this figure in terms of coupling stability, but is shifted from this rotationally symmetric position. It is also allowed to be formed.

  Two double-row angular ball bearings 34 and 34 are provided on the other end side of the arm 31 as release bearings for the main pulley 2, and the arm 31 is connected to the movable sheave 4 via the bearings 34 and 34. Is urged toward the fixed sheave 3 side. By interposing the bearing 34 in this way, it is possible to apply an urging force to the movable sheave 4 that rotates about the axis by the arm 31 that does not rotate relative to the movable sheave 4. Instead of using the double row angular ball bearing 34, a deep groove ball bearing can also be used. Further, the number of bearings 34 is not limited to two, and may be one.

  The above embodiment is merely an example, and it is possible to easily assemble and disassemble the actuator 5, and to solve the problem of the present invention of improving the durability, the shape of each member and The arrangement, material, etc. can be changed as appropriate.

1 Drive shaft 2 Drive pulley (pulley)
3 fixed sheave 4 movable sheave 5 actuator 6 driven shaft 7 driven pulley 8 transmission belt 9 motor case 10 motor 11 output gear 12 reduction gear case 13 parallel shaft reduction gear (reduction gear)
14 First gear 15 Rotating shaft 16 Second gear 17 Third gear 18 Shell bearing 19 Holding shaft body 20 Four-point contact ball bearing (bearing)
21 Rotating member 21a Ball screw shaft 22 Fixing member 23 Displacement member 23a Ball screw nut 24 Connecting member 25 Engaging shaft body 26 Engaging portion 27 Screw hole 28 Screw 29 Guide member 30 Notch groove 31 Arm 32 Guide groove 33 Locking groove 34 Double row angular contact ball bearings (bearings)

Claims (7)

A pulley (2) having a fixed sheave (3) and a movable sheave (4) that is paired with the fixed sheave (3), and the movable sheave (4) are in axial contact with the fixed sheave (3). An actuator for a continuously variable transmission comprising an actuator (5) to be separated;
The actuator (5) is a rotating member (21) rotated by the driving force of the motor (10), a displacement member (23) displaced in the axial direction by the rotation of the rotating member (21), and the displacement member (23 ), A guide member (29) for guiding the connection member (24) in the axial direction while preventing the connection member (24) from rotating about an axis, the connection member (24), and the movable sheave (4). An arm (31) connected between
One side of the connecting member (24) or the arm (31) has an engaging shaft (25) extending so as to face the other side of the connecting member (24) or the arm (31), and this An engagement portion (26) projecting in the radial direction from the engagement shaft body (25),
The other side of the connecting member (24) or the arm (31) has a guide groove (32) for guiding the engaging portion (26) in the axial direction of the engaging shaft body (25), and the guide groove ( 32), and a locking groove (33) extending in the rotation direction around the axis of the engaging shaft body (25).
After the engaging portion (26) is inserted to the groove bottom of the guide groove (32), the connecting member (24) and the arm (31) are rotated relative to each other around the axis, thereby the locking groove (33). ), The engaging portion (26) is fitted into the continuously variable transmission actuator.   The continuously variable transmission actuator according to claim 1, wherein the rotating member (21) is a ball screw shaft (21a) and the displacement member (23) is a ball screw nut (23a).   3. The continuously variable transmission according to claim 1, wherein two or more of the engaging portions (26) are formed rotationally symmetrically around the axis of the engaging shaft body (25). Actuator.   The planetary speed reducer or the parallel shaft speed reducer (13) that decelerates the rotation of the motor (10) and transmits it to the rotating member (21), further comprising a planetary speed reducer (13). An actuator for a continuously variable transmission as described in 1.   The double-row angular contact ball bearing (34) or the deep groove ball bearing is provided between the movable sheave (4) and the arm (31), according to any one of claims 1 to 4. Actuator for continuously variable transmission.   The continuously variable transmission actuator according to any one of claims 1 to 5, wherein the rotating member (21) is supported by a four-point contact ball bearing (20) or a deep groove ball bearing.   A continuously variable transmission in which the movable sheave (4) is moved by the continuously variable transmission actuator according to any one of claims 1 to 6.

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