JP2014152806A - Vehicular power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress abnormal wear on a specified gear tooth of a gear for changing the eccentricity of an eccentric member in a vehicular power transmission device including a crank-type continuously variable transmission.SOLUTION: The teeth number of a ring gear 19b is set to a value that is different by the integral multiple of the teeth number of a pinion 17. When a shift range detected by a shift range detection means is a non-running range, a change gear ratio control means U drives a shifting actuator 23 and rotates an eccentric disc 19 360° with respect to an eccentric cam 18. As a result, the gear teeth of the pinion 17 meshing with the gear teeth of the ring gear 19b can differ between before and after the rotation, which can prevent a gear tooth of a specified gear "a" of the pinion 17 from wearing. The eccentric disc 19 rotates 360° when the shift range is the non-running range and a vehicle is stopped, and there is therefore no problem even when a change gear ratio of a continuously variable transmission temporarily changes during the rotation.

Description

  The present invention relates to a vehicle power transmission device including a crank type continuously variable transmission that transmits a driving force from an input shaft to an output shaft via a connecting rod that reciprocates and a one-way clutch.

  In a vehicle power transmission device including a continuously variable transmission that converts rotation of an input shaft connected to an engine into reciprocating motion of a connecting rod, and converts reciprocating motion of the connecting rod into rotational motion of an output shaft by a one-way clutch. When continuously running the continuously variable transmission at a constant gear ratio, the pinion and ring gear for changing the eccentric amount of the eccentric member provided on the input shaft continue to mesh at the same position, causing specific gear teeth to malfunction In order to prevent wear, the gear ratio of the continuously variable transmission is temporarily changed to change the meshing position of the pinion and ring gear, and the engine output torque is changed accordingly, thereby Patent Document 1 below discloses that a specific gear tooth is prevented from being abnormally worn while avoiding a decrease.

JP 2012-215228 A

  By the way, a vehicle equipped with this type of continuously variable transmission controls the eccentric amount of the eccentric member to zero while the vehicle is stopped, and starts from this state by increasing the eccentric amount of the eccentric member. Yes. When the vehicle starts with the eccentric amount of the eccentric member increased from zero, a large load is applied to the portion where the gear teeth of the pinion and ring gear that change the eccentric amount of the eccentric member mesh, so the eccentric amount of the eccentric member is zero. At times, specific gear teeth that mesh with each other may wear abnormally, resulting in a decrease in durability.

  The present invention has been made in view of the above-described circumstances, and suppresses abnormal wear of specific gear teeth of a gear that changes an eccentric amount of an eccentric member in a vehicle power transmission device including a crank type continuously variable transmission. For the purpose.

  To achieve the above object, according to the first aspect of the present invention, a continuously variable transmission that shifts the rotation of the input shaft connected to the drive source and transmits the rotation to the output shaft is integrated with the input shaft. An eccentric cam formed on the outer periphery of the eccentric cam, an eccentric member formed with a ring gear that fits relative to the outer periphery of the eccentric cam, a transmission shaft that is arranged coaxially with the input shaft and rotated by a transmission actuator, and the transmission shaft A pinion that meshes with the ring gear; a one-way clutch that is provided on the output shaft; a connecting rod that is connected to the eccentric member and an outer member of the one-way clutch; To change the phase of the eccentric member relative to the eccentric cam, thereby changing the amount of eccentricity of the eccentric member from the axis of the input shaft. A gear ratio control means for changing a gear ratio, wherein the number of teeth of the ring gear is set to a value different from an integer multiple of the number of teeth of the pinion, and the shift range selected by the driver When the shift range detected by the shift range detection means is a non-traveling range, the speed ratio control means drives the speed change actuator to move the eccentric member relative to the eccentric cam. A vehicle power transmission device characterized by rotating 360 ° is proposed.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the continuously variable transmission can be shifted in shift range by shift-by-wire, and the shift range detecting means is not driven from the travel range. After detecting the switch to the travel range and starting the rotation of the eccentric member by 360 °, when the shift range detecting means detects the switch from the non-travel range to the travel range, the eccentric member A vehicular power transmission device is proposed in which the shift range of the continuously variable transmission is maintained in the non-traveling range until the phase returns.

  According to the invention described in claim 3, in addition to the configuration of claim 2, while the rotation angle θ of the eccentric member detected by the rotation angle detection means is 0 ° <θ ≦ 180 °, A vehicle power transmission device is proposed in which when the shift range detection means detects a switching from the non-travel range to the travel range, the speed ratio control means reverses the eccentric member to the phase at the start of rotation. The

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the continuously variable transmission is mechanically interlocked with the operation of the shift lever by the driver, and the ignition range is switched off. When the detecting means detects that the ignition is turned off by operating the ignition key, the speed ratio control means drives the speed change actuator to rotate the eccentric member 360 ° relative to the eccentric cam. A vehicle power transmission device is proposed.

  According to the invention described in claim 5, in addition to the configuration of claim 4, the eccentricity detected by the rotation angle detecting means after the transmission ratio control means starts to rotate the eccentric member by 360 °. While the rotation angle θ of the member is 0 ° <θ ≦ 180 °, the gear ratio control means detects the eccentric member when the ignition off detection means detects that the ignition is turned on by operating the ignition key. A vehicle power transmission device is proposed that reverses the phase to the phase at the start of rotation.

  The eccentric disk 19 of the embodiment corresponds to the eccentric member of the present invention, the engine E of the embodiment corresponds to the drive source of the present invention, and the crank rotation angle detection means Sb and pinion rotation angle detection of the embodiment. The means Sc corresponds to the rotation angle detection means of the present invention, and the electronic control unit U of the embodiment corresponds to the transmission ratio control means of the present invention.

  According to the configuration of the first aspect, the continuously variable transmission of the vehicle power transmission device includes an eccentric member that is variable in eccentricity from the axis of the input shaft and rotates together with the input shaft, and a one-way provided on the output shaft. Since it is configured by connecting the outer member of the clutch with a connecting rod, when the input shaft rotates and the connecting rod reciprocates, the one-way clutch is intermittently engaged and the output shaft rotates intermittently. Power is transmitted. At that time, the transmission ratio control means rotates the transmission shaft relative to the input shaft with the transmission actuator and rotates the ring gear with the pinion to change the phase of the eccentric member with respect to the eccentric cam, thereby changing the axis from the axis of the input shaft. The gear ratio can be changed by changing the amount of eccentricity of the eccentric member.

  When the number of teeth of the ring gear is set to a value different from an integer multiple of the number of teeth of the pinion, and the shift range detected by the shift range detecting means is a non-traveling range, the gear ratio control means drives the speed change actuator to perform eccentricity. Since the member is rotated 360 ° with respect to the eccentric cam, the gear teeth of the pinion meshing with the gear teeth of the ring gear can be made different before and after the rotation, thereby preventing the specific gear teeth of the pinion from being worn. can do. Moreover, the 360 ° rotation of the eccentric disk is performed when the shift range is the non-traveling range and the vehicle is stopped, so there is no problem even if the gear ratio of the continuously variable transmission changes temporarily during that time. Absent.

  According to the second aspect of the present invention, since the continuously variable transmission can change the shift range by shift-by-wire, the timing of switching the continuously variable transmission from the non-traveling range to the traveling range is delayed to restrict the start of the vehicle. can do. After the shift range detection means detects the switching from the travel range to the non-travel range and the eccentric member starts to rotate 360 °, the shift range detection means detects the switch from the non-travel range to the travel range. The shift range of the continuously variable transmission is held in the non-traveling range by shift-by-wire until the member returns to the phase at the start of rotation, so that the driving range immediately after the driver operates the shift lever to the non-traveling range. In such a case, it is possible to avoid a situation in which the vehicle starts in a state where the eccentric member is in the middle of 360 ° rotation and the gear ratio is changing.

  According to the third aspect of the present invention, the shift range detecting means switches from the non-traveling range to the traveling range while the rotational angle θ of the eccentric member detected by the rotational angle detecting means is 0 ° <θ ≦ 180 °. Since the gear ratio control means reverses the eccentric member to the phase at the start of rotation, the eccentric member can be returned to the phase at the start of rotation in a shorter time than rotating the eccentric member as it is 360 °, The delay in starting the vehicle can be minimized.

  According to the fourth aspect of the present invention, since the continuously variable transmission is mechanically interlocked with the operation of the shift lever by the driver, the shift range is switched, so the timing for switching the continuously variable transmission from the non-traveling range to the traveling range. May not be delayed by the control, and the vehicle may start in a state where the eccentric member is in the middle of 360 ° rotation and the gear ratio is changing. However, when the ignition-off detection means detects that the ignition is turned off by operating the ignition key, the speed ratio control means drives the speed change actuator to rotate the eccentric member 360 ° with respect to the eccentric cam. Even when the shift range of the step transmission is switched to the travel range, it is possible to avoid the situation where the vehicle starts.

  According to the fifth aspect of the present invention, the rotation angle θ of the eccentric member detected by the rotation angle detecting unit is 0 ° <θ ≦ 180 ° after the transmission ratio control unit starts to rotate the eccentric member by 360 °. In the meantime, when the ignition-off detecting means detects that the ignition is turned on by operating the ignition key, the transmission ratio control means reverses the eccentric member to the phase at the start of rotation, so the eccentric member is rotated 360 ° as it is. It is possible to return the eccentric member to the phase at the start of rotation in a shorter time than that, and when the vehicle can start due to the ignition ON, the delay in starting the vehicle can be minimized.

The whole view of a continuously variable transmission. (First embodiment) The partially broken perspective view of the principal part of a continuously variable transmission. (First embodiment) FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. (First embodiment) FIG. 4 is an enlarged view of part 4 of FIG. 3. (First embodiment) FIG. 5 is a sectional view taken along line 5-5 of FIG. (First embodiment) The figure which shows the shape of an eccentric disk. (First embodiment) The figure which shows the relationship between the eccentric amount of an eccentric disk, and a gear ratio. (First embodiment) The figure which shows the state of the eccentric disk in TD gear ratio and UD gear ratio. (First embodiment) Action explanatory drawing of 360 degree rotation of an eccentric disk. (First embodiment) The block diagram of the control system of the electric motor of a speed change actuator. (First embodiment) The flowchart of 360 degree rotation control of an eccentric disk. (First embodiment) The figure which shows the comparative example corresponding to FIG. (First embodiment) The flowchart of 360 degree rotation control of an eccentric disk. (Second Embodiment) The block diagram of the control system of the electric motor of a speed change actuator. (Third embodiment) The flowchart of 360 degree rotation control of an eccentric disk. (Third embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 5, an input shaft 12 and an output shaft 13 are supported in parallel with each other on a pair of side walls 11 a and 11 b of a transmission case 11 of a continuously variable transmission T for an automobile. The rotation of the connected input shaft 12 is transmitted to the drive wheels via the six transmission units 14..., The output shaft 13 and the differential gear D. A variable speed shaft 15 sharing an axis L with the input shaft 12 is fitted into the hollow formed input shaft 12 via seven needle bearings 16 so as to be relatively rotatable. Since the structure of the six transmission units 14 is substantially the same, the structure will be described below with one transmission unit 14 as a representative.

  The transmission unit 14 includes a pinion 17 provided on the outer peripheral surface of the transmission shaft 15, and the pinion 17 is exposed from an opening 12 a formed in the input shaft 12. A disc-shaped eccentric cam 18 divided into two in the direction of the axis L is splined to the outer periphery of the input shaft 12 so as to sandwich the pinion 17. The center O1 of the eccentric cam 18 is eccentric with respect to the axis L of the input shaft 12 by a distance d. In addition, the six eccentric cams 18 of the six transmission units 14 are offset in phase by 60 ° from each other.

  On the outer peripheral surface of the eccentric cam 18, a pair of eccentric recesses 19 a and 19 a formed on both end surfaces in the axis L direction of the disc-shaped eccentric disk 19 are rotatably supported via a pair of needle bearings 20 and 20. . The center O1 of the eccentric recesses 19a, 19a (that is, the center O1 of the eccentric cam 18) is shifted from the center O2 of the eccentric disk 19 by a distance d. That is, the distance d between the axis L of the input shaft 12 and the center O1 of the eccentric cam 18 and the distance d between the center O1 of the eccentric cam 18 and the center O2 of the eccentric disk 19 are the same.

  A pair of crescent-shaped guide portions 18a and 18a are provided on the split surface of the eccentric cam 18 divided into two in the direction of the axis L so as to be coaxial with the center O1 of the eccentric cam 18. The tooth tips of the ring gear 19b formed so as to communicate between the bottoms of the recesses 19a and 19a slidably contact the outer peripheral surfaces of the guide portions 18a and 18a of the eccentric cam 18. Then, the pinion 17 of the transmission shaft 15 meshes with the ring gear 19b of the eccentric disk 19 through the opening 12a of the input shaft 12.

  In the present embodiment, the number of teeth of the pinion 17 is 18, the number of teeth of the ring gear 19b is 32, and the number of teeth 32 of the ring gear 19b is set so as not to be an integral multiple of the number of teeth 18 of the pinion 17. (See FIG. 9).

  One end side of the input shaft 12 is directly supported on one side wall 11 a of the mission case 11 via a ball bearing 21. A cylindrical portion 18b provided integrally with one eccentric cam 18 located on the other end side of the input shaft 12 is supported on the side wall 11b on the other end side of the mission case 11 via a ball bearing 22. The other end side of the input shaft 12 splined to the inner periphery of the eccentric cam 18 is indirectly supported by the mission case 11.

  The speed change actuator 23 that changes the speed ratio of the continuously variable transmission T by rotating the speed change shaft 15 relative to the input shaft 12 is supported by the transmission case 11 so that the motor shaft 24a is coaxial with the axis L. A motor 24 and a planetary gear mechanism 25 connected to the electric motor 24 are provided. The planetary gear mechanism 25 includes a carrier 27 that is rotatably supported by an electric motor 24 via a needle bearing 26, a sun gear 28 that is fixed to the motor shaft 24a, and a plurality of two stations that are rotatably supported by the carrier 27. The pinion 29..., The first ring gear 30 splined to the shaft end of the hollow input shaft 12 (strictly speaking, the shaft end of the cylindrical portion 18 b of the one eccentric cam 18), and the transmission shaft 15 to the spline And a second ring gear 31 coupled thereto. Each double pinion 29 includes a first pinion 29a having a large diameter and a second pinion 29b having a small diameter. The first pinion 29a meshes with the sun gear 28 and the first ring gear 30, and the second pinion 29b has a second ring gear. Mesh with 31.

  On the outer periphery of the eccentric disk 19, an annular portion 33 a on one end side of the connecting rod 33 is supported via a roller bearing 32 so as to be relatively rotatable.

  The output shaft 13 is supported by a pair of ball bearings 34 and 35 on a pair of side walls 11a and 11b of the mission case 11, and a one-way clutch 36 is provided on the outer periphery thereof. The one-way clutch 36 includes a ring-shaped outer member 38 pivotally supported at the tip of the rod portion 33 b of the connecting rod 33 via a connecting pin 37, and an inner member disposed inside the outer member 38 and fixed to the output shaft 13. A plurality of rollers arranged in a wedge-shaped space formed between the member 39 and an arcuate surface of the inner periphery of the outer member 38 and a plane of the outer periphery of the inner member 39 and biased by a plurality of springs 40. 41...

  As shown in FIGS. 6 and 8, since the center O1 of the eccentric recesses 19a and 19a (that is, the center O1 of the eccentric cam 18) is shifted from the center O2 of the eccentric disk 19 by a distance d, the outer circumference of the eccentric disk 19 And the inner periphery of the eccentric recesses 19a, 19a are non-uniform in the circumferential direction, and crescent-shaped thinning recesses 19c, 19c are formed at portions where the interval is large.

  Next, the operation of one transmission unit 14 of the continuously variable transmission T will be described.

  As is clear from FIGS. 5 and 7A to 7D, when the input shaft 12 is rotated by the engine E when the center O2 of the eccentric disk 19 is eccentric with respect to the axis L of the input shaft 12. As the annular portion 33a of the connecting rod 33 rotates eccentrically around the axis L, the rod portion 33b of the connecting rod 33 reciprocates.

  As a result, in FIG. 5, when the connecting rod 33 is reciprocated and pushed to the right in the figure, the rollers 41 urged by the springs 40 engage the wedge-shaped space between the outer member 38 and the inner member 39. The outer member 38 and the inner member 39 are coupled via the rollers 41... So that the one-way clutch 36 is engaged and the movement of the connecting rod 33 is transmitted to the output shaft 13. On the other hand, when the connecting rod 33 is reciprocated, the rollers 41 are pushed out of the wedge-shaped space between the outer member 38 and the inner member 39 while compressing the springs 40. As the inner members 39 slip each other, the one-way clutch 36 is disengaged and the movement of the connecting rod 33 is not transmitted to the output shaft 13.

  Thus, since the rotation of the input shaft 12 is transmitted to the output shaft 13 for a predetermined time while the input shaft 12 rotates once, the output shaft 13 rotates intermittently when the input shaft 12 rotates continuously. Since the eccentric discs 19 of the six transmission units 14 are out of phase with each other by 60 °, the six transmission units 14 alternately transmit the rotation of the input shaft 12 to the output shaft 13. Thus, the output shaft 13 rotates continuously.

  At this time, as the eccentric amount ε of the eccentric disk 19 increases, the reciprocating stroke of the connecting rod 33 increases, and the one-time rotation angle of the output shaft 13 increases, and the transmission ratio of the continuously variable transmission T decreases. Conversely, the smaller the eccentric amount ε of the eccentric disk 19, the smaller the reciprocating stroke of the connecting rod 33, the smaller the rotation angle of the output shaft 13, and the higher the gear ratio of the continuously variable transmission T. When the eccentric amount ε of the eccentric disk 19 becomes zero, the connecting rod 33 stops moving even when the input shaft 12 rotates, so the output shaft 13 does not rotate, and the gear ratio of the continuously variable transmission T is maximized ( Infinity).

  When the transmission shaft 15 does not rotate relative to the input shaft 12, that is, when the input shaft 12 and the transmission shaft 15 rotate at the same speed, the transmission ratio of the continuously variable transmission T is maintained constant. In order to rotate the input shaft 12 and the transmission shaft 15 at the same speed, the electric motor 24 may be rotationally driven at the same speed as the input shaft 12. The reason is that the first ring gear 30 of the planetary gear mechanism 25 is connected to the input shaft 12 and rotates at the same speed as the input shaft 12. When the electric motor 24 is driven at the same speed, the sun gear 28 and the first ring gear 30 are driven. Rotate at the same speed, the planetary gear mechanism 25 is locked and rotates as a whole. As a result, the input shaft 12 and the transmission shaft 15 connected to the first ring gear 30 and the second ring gear 31 that rotate integrally are integrated and rotate at the same speed without relative rotation.

  When the rotational speed of the electric motor 24 is increased or decreased with respect to the rotational speed of the input shaft 12, the first ring gear 30 coupled to the input shaft 12 and the sun gear 28 connected to the electric motor 24 rotate relative to each other. The carrier 27 rotates relative to the first ring gear 30. At this time, the gear ratio of the first ring gear 30 and the first pinion 29a meshing with each other is slightly different from the gear ratio of the second ring gear 31 and the second pinion 29b meshing with each other. And the transmission shaft 15 connected to the second ring gear 31 rotate relative to each other.

  When the transmission shaft 15 rotates relative to the input shaft 12 in this manner, the eccentric recesses 19 a and 19 a of the eccentric disk 19 in which the ring gear 19 b is engaged with the pinion 17 of each transmission unit 14 are integrated with the input shaft 12. The cam 18 rotates while being guided by the guide portions 18a, 18a, and the eccentric amount ε of the center O2 of the eccentric disk 19 with respect to the axis L of the input shaft 12 changes.

  FIG. 7A shows a state where the speed ratio is minimum (speed ratio: TD). At this time, the eccentric amount ε of the center O2 of the eccentric disk 19 with respect to the axis L of the input shaft 12 is the axis L of the input shaft 12. To a center O1 of the eccentric cam 18 and a maximum value equal to 2d, which is the sum of the distance d from the center O1 of the eccentric cam 18 to the center O2 of the eccentric disk 19. As shown in FIGS. 7B and 7C, when the transmission shaft 15 rotates relative to the input shaft 12, the eccentric disk 19 rotates relative to the eccentric cam 18 integral with the input shaft 12. Furthermore, the eccentric amount ε of the center O2 of the eccentric disk 19 with respect to the axis L of the input shaft 12 is gradually decreased from the maximum value 2d, and the transmission ratio is increased. When the transmission shaft 15 further rotates relative to the input shaft 12, the eccentric disk 19 further rotates relative to the eccentric cam 18 integral with the input shaft 12, and finally, as shown in FIG. The center O2 of the eccentric disk 19 overlaps the axis L of the input shaft 12, the eccentricity ε becomes zero, the transmission gear ratio is maximized (infinite) (transmission ratio: UD), and power is transmitted to the output shaft 13. Blocked.

  FIG. 10 shows a control system of the electric motor 24 that drives the speed change actuator 23. The electronic control unit U comprising a microcomputer has a shift range detection that detects the shift range selected by the driver by operating the shift lever. The means Sa, the crank rotation angle detection means Sb for detecting the crank rotation angle of the engine E, and the pinion rotation angle detection means Sc for detecting the rotation angle of the pinions 17 provided on the transmission shaft 15 are connected.

  The crank rotation angle detection means Sb and the pinion rotation angle detection means Sc constitute a rotation angle detection means for detecting the rotation angle of the eccentric disk 19. This is because the rotation angle of the crankshaft coincides with the rotation angle of the input shaft 12, and therefore the rotation angle of the input shaft 12 detected by the crank rotation angle detection means Sb and the rotation angle of the pinion 17 detected by the pinion rotation angle detection means Sc. Is a relative rotation angle of the pinion 17 with respect to the eccentric cam 18 that rotates integrally with the input shaft 12. If the relative rotation angle of the pinion 17 is known, the rotation angle of the ring gear 19b relative to the eccentric cam 18, that is, the rotation angle of the eccentric disk 19, can be known from the number of teeth of the pinion 17 and the number of teeth of the ring gear 19b. As the rotation angle detecting means, a device that directly detects the rotation angle of the ring gear 19b with respect to the eccentric cam 18 may be used.

  Next, control for preventing abnormal wear of specific gear teeth of the pinions 17 will be described based on the flowchart of FIG.

  First, in step S1, when the shift range detecting means Sa detects that the driver has operated the shift lever to select the parking range, the electric motor 24 is driven by a command from the electronic control unit U in step S2, and the pinion 17 Rotates, and the eccentric disk 19 in which the ring gear 19 b is engaged with the pinion 17 starts to rotate around the eccentric cam 18. In step S3, the rotation angle θ of the eccentric disk 19 is calculated from the rotation speed of the input shaft 12 detected by the crank rotation angle detection means Sb and the rotation speed of the pinion 17 detected by the pinion rotation angle detection means Sc. When reaching 360 °, the electric motor 24 stops. In this way, every time the parking range is selected by the shift lever, the eccentric disk 19 makes one rotation around the eccentric cam 18.

  As shown in FIG. 9 (A), when the vehicle stops, the transmission ratio of the continuously variable transmission T is returned to the infinite UD, so that the eccentric amount ε of the eccentric disk 19 becomes zero, and at this time, the pinion 17 It is assumed that one gear tooth a engages with the ring gear 19b. FIG. 9B shows a state in which the eccentric disk 19 driven by the pinion 17 is rotated 90 ° (eight gear teeth) from the state of FIG. 9A, and FIG. The eccentric disk 19 driven by the pinion 17 from the state of FIG. 9B further rotates clockwise by 90 ° (eight gear teeth), and the eccentric amount ε of the eccentric disk 19 reaches the maximum TD. Show. At this time, the gear teeth a of the pinion 17 are in a state of being rotated by an angle that is two teeth less than one rotation.

  FIG. 9 (D) shows a state in which the eccentric disk 19 driven by the pinion 17 further rotates 90 ° (eight gear teeth) from the state of FIG. 9 (C). FIG. 9 (E) 9B, the eccentric disk 19 driven by the pinion 17 further rotates clockwise by 90 ° (eight gear teeth), and the eccentric amount ε of the eccentric disk 19 is zero before the rotation starts. The state is returned to UD and becomes UD. At this time, the gear teeth a of the pinion 17 are in a state of being rotated by an angle that is four teeth less than two rotations.

  In this way, the pinion 17 rotates only slightly less than two rotations while the eccentric disk 19 makes one rotation, and instead of the gear tooth a initially meshed with the ring gear 19b, another gear tooth b (FIG. 9E). Is in a state of meshing with the ring gear 19b. Therefore, every time the shift lever is operated to the parking range, a different gear tooth of the pinion 17 meshes with the ring gear 19b, so that only a specific gear tooth of the pinion 17 is abnormally worn and durability is lowered. It can be avoided. In addition, the 360 ° rotation of the eccentric disk 19 is performed when the shift range is the parking range and the vehicle is stopped, so there is no problem even if the gear ratio of the continuously variable transmission T changes temporarily during that time. There is no.

  On the other hand, in the comparative example shown in FIG. 12, the number of teeth of the ring gear 19b is set to 24, the number of teeth of the pinion 17 is set to 12, and the number of teeth of the ring gear 19b is an integral multiple of the number of teeth of the pinion 17 ( 2 times). Therefore, when the pinion 17 rotates twice and the eccentric disk 19 rotates once from the state of FIG. 12A to the state of FIG. 12E, the same gear teeth a of the pinion 17 mesh with the ring gear 19b. Therefore, the gear teeth a may be abnormally worn and the durability may be reduced.

Second embodiment

  Next, a second embodiment of the present invention will be described based on the flowchart of FIG.

  The continuously variable transmission T according to the second embodiment is controlled by shift-by-wire. That is, the continuously variable transmission T includes a range switching means (not shown) that switches between a forward travel range, a reverse travel range, a parking range, and a neutral range, and converts a driver's shift lever operation into an electrical signal. By driving an actuator (not shown) based on the electrical signal, the range switching means can be operated to switch the forward travel range, the reverse travel range, the parking range, and the neutral range.

  After the eccentric disk 19 starts rotating in the parking range, it takes 1 to 2 seconds for the eccentric disk 19 to rotate 360 ° and return to the original phase. After the driver operates the shift lever from the forward travel range to the parking range and the eccentric disk 19 starts to rotate, the driver moves the shift lever forward from the parking range before the 360 ° rotation of the eccentric disk 19 is completed. If the vehicle is operated to the travel range or the reverse travel range, the vehicle may start unexpectedly with a large gear ratio. This embodiment is for avoiding such a situation.

  When the shift lever is operated to the parking range in step S11 of the flowchart of FIG. 13, switching to a range other than the parking range of the continuously variable transmission T is prohibited by shift-by-wire in step S12, and eccentricity is performed in step S13. The rotation of 360 ° of the disk 19 is started. If the rotation angle θ of the eccentric disk 19 is already 180 ° (half rotation) or more in step S14, the rotation of the eccentric disk 19 is continued as it is in step S15, and the rotation angle θ of the eccentric disk 19 is 360 in step S16. If it reaches °, rotation of the eccentric disk 19 is stopped in step S17, and switching to a range other than the parking range of the continuously variable transmission T is permitted by shift-by-wire in step S18, so that the vehicle can start. Become.

  On the other hand, when the rotation angle θ of the eccentric disk 19 is less than 180 ° (half rotation) in step S14 and the shift lever is operated to a range other than the parking range in step S19, the rotation of the eccentric disk 19 is performed in step S20. When the direction is switched to the reverse direction and the rotation angle θ of the eccentric disk 19 returns to 0 ° in step S21, the rotation of the eccentric disk 19 is stopped in step S22, and in step S23, the continuously variable transmission T is operated by shift-by-wire. Switching to a range other than the parking range is permitted, and the vehicle can be started.

  As described above, after the driver operates the shift lever from the forward travel range to the parking range and the eccentric disk 19 starts to rotate, the driver moves the shift lever before the 360 ° rotation of the eccentric disk 19 is completed. Is operated from the parking range to the forward travel range or the reverse travel range, if the rotational angle θ of the eccentric disk 19 is 180 ° or more, it is rotated as it is to return to the UD state, and the rotational angle θ of the eccentric disk 19 is 180. If it is less than 0 °, it is reversed and returned to the UD state, so that the eccentric disk 19 can be returned to the UD state in the shortest time to minimize the delay in starting the vehicle.

Third embodiment

  Next, a third embodiment of the present invention will be described based on FIG. 14 and FIG.

  The continuously variable transmission T of the first and second embodiments has a shift range that is switched by shift-by-wire. The continuously variable transmission T of the third embodiment has a shift range that is manually operated. Can be switched. That is, when the driver operates the shift lever, the movement is mechanically transmitted to the manual valve of the hydraulic control device via a wire or a link, and the forward travel range of the continuously variable transmission T is actuated by an actuator that is operated by hydraulic pressure. The reverse drive range, the parking range, and the neutral range are switched. Therefore, if the driver operates the shift lever from the parking range to the forward travel range or the reverse travel range while the eccentric disk 19 is rotated by 360 ° in the parking range, the continuously variable transmission T travels forward. Since it is not possible to electrically restrict switching to the range or the reverse travel range, the vehicle may start with a large gear ratio. The third embodiment is for avoiding such a situation.

  FIG. 14 shows a control system of the electric motor 24 of the speed change actuator 23 according to the third embodiment. In contrast to the first embodiment shown in FIG. An ignition-off detection means Sd is added.

  When the shift lever is operated to the parking range in step S31 of the flowchart of FIG. 15 and the ignition key off operation is detected by the ignition off detection means Sd in step S32, the eccentric disk 19 is rotated 360 ° in step S33. Be started. If the rotation angle θ of the eccentric disk 19 is already 180 ° (half rotation) or more in step S34, the rotation of the eccentric disk 19 is continued as it is in step S35, and the rotation angle θ of the eccentric disk 19 is 360 in step S36. If it reaches 0 °, the rotation of the eccentric disk 19 is stopped in step S37.

  On the other hand, if the rotation angle θ of the eccentric disk 19 is less than 180 ° (half rotation) in step S34 and the ignition key ON operation is detected by the ignition off detection means Sd in step S38, the eccentric disk is detected in step S39. If the rotation direction θ of the eccentric disk 19 returns to 0 ° in step S40, the rotation of the eccentric disk 19 is stopped in step S31.

  As described above, when the continuously variable transmission T is manually operated to change the shift range, the eccentric disk 19 starts rotating 360 ° on the condition that the ignition key is turned off. It is guaranteed that the engine E will not start in a short period of 1 second to 2 seconds, in which the driver completes the 360 ° rotation, and the driver removes the shift lever from the parking range before the 360 ° rotation of the eccentric disk 19 is completed. Even if the vehicle is operated to the forward travel range or the reverse travel range, the vehicle can be prevented from starting unexpectedly.

  Further, when the ignition key is turned on and the engine E starts when the rotational angle θ of the eccentric disk 19 is less than 180 °, the eccentric disk 19 is reversely rotated to quickly return to the UD state, thereby delaying the start of the vehicle. Can be minimized.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the drive source of the present invention is not limited to the engine E of the embodiment, and may be another drive source such as an electric motor.

  In the embodiment, the number of teeth of the ring gear 19b is set to 32, and the number of teeth of the pinion 17 is set to 18. However, the number of teeth of the ring gear 19b and the pinion 17 is not limited to this, and the number of teeth of the ring gear 19b. Is not an integral multiple of the number of teeth of the pinion 17.

12 Input shaft 13 Output shaft 15 Transmission shaft 17 Pinion 18 Eccentric cam 19 Eccentric disc (eccentric member)
19b Ring gear 23 Transmission actuator 33 Connecting rod 36 One-way clutch 38 Outer member E Engine (drive source)
L Axis of input shaft Sa Shift range detection means Sb Crank rotation angle detection means (rotation angle detection means)
Sc pinion rotation angle detection means (rotation angle detection means)
Sd Ignition off detection means U Electronic control unit (speed ratio control means)
T Continuously variable transmission ε Eccentricity

Claims (5)

A continuously variable transmission (T) for shifting the rotation of the input shaft (12) connected to the drive source (E) and transmitting it to the output shaft (13),
An eccentric cam (18) provided integrally with the input shaft (12);
An eccentric member (19) formed with a ring gear (19b) that fits on the outer periphery of the eccentric cam (18) in a relatively rotatable manner;
A transmission shaft (15) disposed coaxially with the input shaft (12) and rotated by a transmission actuator (23);
A pinion (17) provided on the transmission shaft (15) and meshing with the ring gear (19b);
A one-way clutch (36) provided on the output shaft (13);
A connecting rod (33) connected to the eccentric member (19) and an outer member (38) of the one-way clutch (36) to reciprocate;
By rotating the transmission shaft (15) relative to the input shaft (12) to change the phase of the eccentric member (19) with respect to the eccentric cam (18), the axis of the input shaft (12) ( L) gear ratio control means (U) for changing the gear ratio by changing the amount of eccentricity (ε) of the eccentric member (19) from L), and the number of teeth of the ring gear (19b) is the pinion (17) Vehicle power transmission device set to a value different from an integral multiple of the number of teeth of
A shift range detection means (Sa) for detecting a shift range selected by the driver is provided, and when the shift range detected by the shift range detection means (Sa) is a non-traveling range, the transmission ratio control means (U) A vehicle power transmission device that drives the speed change actuator (23) to rotate the eccentric member (19) 360 ° relative to the eccentric cam (18).   In the continuously variable transmission (T), the shift range is switched by shift-by-wire, and the shift range detecting means (Sa) detects the switching from the travel range to the non-travel range, and the eccentric member (19) After the 360 ° rotation is started, when the shift range detecting means (Sa) detects the switching from the non-traveling range to the traveling range, the non-running member (19) does not operate until the eccentric member (19) returns to the phase at the start of rotation. The power transmission device for a vehicle according to claim 1, wherein a shift range of the step transmission (T) is maintained in a non-traveling range.   While the rotation angle θ of the eccentric member (19) detected by the rotation angle detection means (Sb, Sc) is 0 ° <θ ≦ 180 °, the shift range detection means (Sa) moves from the non-travel range to the travel range. 3. The vehicle power transmission device according to claim 2, wherein when the switching to is detected, the transmission ratio control means (U) reverses the eccentric member (19) to the phase at the start of rotation. 4.   The continuously variable transmission (T) is mechanically interlocked with the operation of the shift lever by the driver, and the shift range is switched, and the ignition-off detection means (Sd) detects that the ignition is turned off by operating the ignition key. Then, the transmission ratio control means (U) drives the transmission actuator (23) to rotate the eccentric member (19) 360 ° relative to the eccentric cam (18). Item 4. The vehicle power transmission device according to Item 1.   After the gear ratio control means (U) starts to rotate the eccentric member (19) by 360 °, the rotation angle θ of the eccentric member (19) detected by the rotation angle detecting means (Sb, Sc) is 0 °. When the ignition-off detecting means (Sd) detects that the ignition is turned on by operating the ignition key while <θ ≦ 180 °, the transmission ratio control means (U) The vehicle power transmission device according to claim 4, wherein the rotation is reversed to a phase at the time of starting rotation.

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