JP2011202791A - Power transmission device and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deformation of an input member in a power transmission device and a control method thereof.SOLUTION: The power transmission device is provided with a continuously variable transmission, wherein an input cone connected to an input shaft and an output cone connected to an output shaft are disposed in opposite directions to one another, and a ring is pinched with a pinching force, which increases as the torque that acts on the output shaft increases, according to a pinching force adjustment mechanism that converts the torque that acts on the output shaft into a force in the direction of the output shaft. When the ring position is at the maximum diameter of an output member, which is the large diameter end of the output cone, if the output torque Tout that acts on the output shaft is at or above a threshold value Tref (S120), the ring is made to slide to the small-diameter side of the output cone (S130, S140).

Description

  The present invention relates to a power transmission device and a control method thereof.

  Conventionally, as this kind of power transmission device, the input cone connected to the input shaft and the output cone connected to the output shaft are arranged in parallel opposite to each other, and the torque acting on the output shaft is adjusted with a narrow pressure. There has been proposed one provided with a continuously variable transmission that narrows a ring with both cones by converting it into an axial force by a mechanism and acting on an output cone (for example, see Patent Document 1). In the continuously variable transmission in this apparatus, the power input to the input shaft is output to the output shaft with a change in the gear ratio by sliding the ring.

JP 2009-243559 A

  In such a power transmission device, when the ring is located at the end of the output cone on the large diameter side (when the reduction ratio is maximum), a large torque is likely to act on the output shaft, and depending on the magnitude of the torque A large force acts on the input cone from the output shaft through the narrow pressure adjusting mechanism, the output cone, and the ring, and the input cone may be deformed, resulting in a decrease in power transmission performance. For this reason, it is desired to suppress the deformation of the input cone. However, if such deformation is suppressed by improving the strength of the input cone, the input cone is increased in size and weight.

  The power transmission device and the control method thereof according to the present invention are mainly intended to suppress deformation of the input member.

  The power transmission device and the control method thereof according to the present invention employ the following means in order to achieve the main object described above.

The power transmission device of the present invention is
A power transmission device having an input shaft and an output shaft arranged in parallel to the input shaft, and comprising a continuously variable transmission that continuously shifts the power input to the input shaft and outputs the power to the output shaft. There,
A conical input member connected to the input shaft;
A conical output member connected to the output shaft and disposed opposite to the input member;
An annular transmission member that is constricted by the input member and the output member and transmits power between the input member and the output member;
Slide means capable of changing a gear ratio by sliding the transmission member;
Narrow pressure adjusting means for adjusting the narrow pressure acting on the transmission member in a tendency to increase as the output torque, which is the torque acting on the output shaft, increases.
Position acquisition means for acquiring the position of the transmission member;
Output torque acquisition means for acquiring the output torque;
When the acquired position of the transmission member is within a predetermined range including the large-diameter side end of the output member and the acquired output torque is equal to or greater than a predetermined torque, the transmission member is placed on the small-diameter side of the output member. Slide control means for controlling the slide means to slide;
It is a summary to provide.

  In the power transmission device of the present invention, when the position of the transmission member is within a predetermined range including the large-diameter end of the output member and the output torque that is the torque acting on the output shaft is equal to or greater than the predetermined torque, the transmission member is The sliding means is controlled to slide to the small diameter side of the output member. As a result, the reduction ratio is reduced and the output torque is reduced, so that the force acting on the input member from the output shaft through the narrow pressure adjusting means, the output member, and the ring can be reduced, and the deformation of the input member is suppressed. can do. Here, the “predetermined torque” may be a torque that is predetermined as a lower limit of the output torque that may cause the input member to be deformed or a slightly smaller torque, or at least one of the transmission members. The lower limit of the torque that may cause the portion to protrude from the output member (the contact area between the transmission member and the output member becomes small) or a slightly smaller torque may be used. In addition, the “predetermined range” may be a range that is determined in advance as a range in which torque that may cause deformation of the input member can act on the output shaft, and at least a part of the transmission member outputs It is also possible to set a predetermined range as a range in which a torque that may protrude from the member can act on the output shaft.

  In such a power transmission device of the present invention, the slide control means is a means for controlling the slide means so that the transmission member slides toward the small diameter side of the output member by a distance equal to or greater than the movable distance of the output member. It can also be. In this way, it is possible to more reliably suppress at least a part of the transmission member from protruding from the output member due to deformation of the input member.

  In the power transmission device of the present invention, the slide control means controls the slide means so that the transmission member slides toward the smaller diameter side of the output member by a distance that tends to increase as the acquired output torque increases. It can also be a means to do. By doing so, the transmission member can be slid by a distance corresponding to the output torque.

The power transmission device control method of the present invention includes:
A conical input member connected to the input shaft, a conical output member connected to the output shaft and disposed in the direction opposite to the input member, and the input member and the output member are subjected to a narrow pressure. An annular transmission member that transmits power between the member and the output member, slide means that can change a gear ratio by sliding the transmission member, and output torque that is torque acting on the output shaft A narrow pressure adjusting means for adjusting a narrow pressure acting on the transmission member so as to increase as it increases, continuously changing the power input to the input shaft and outputting it to the output shaft. A method for controlling a power transmission device including a transmission,
When the position of the transmission member is within a predetermined range including the large-diameter end of the output member and the output torque is equal to or greater than a predetermined torque, the sliding means is configured to slide the transmission member to the small-diameter side of the output member. To control the
It is characterized by that.

  In the control method of the power transmission device of the present invention, when the position of the transmission member is within a predetermined range including the large-diameter side end of the output member and the output torque that is the torque acting on the output shaft is equal to or greater than the predetermined torque, The sliding means is controlled so that the transmission member slides to the small diameter side of the output member. As a result, the reduction ratio is reduced and the output torque is reduced, so that the force acting on the input member from the output shaft through the narrow pressure adjusting means, the output member, and the ring can be reduced, and the deformation of the input member is suppressed. can do. Here, the “predetermined torque” may be a torque that is predetermined as a lower limit of the output torque that may cause the input member to be deformed or a slightly smaller torque, or at least one of the transmission members. The lower limit of the torque that may cause the portion to protrude from the output member (the contact area between the transmission member and the output member becomes small) or a slightly smaller torque may be used. In addition, the “predetermined range” may be a range that is determined in advance as a range in which torque that may cause deformation of the input member can act on the output shaft, and at least a part of the transmission member outputs It is also possible to set a predetermined range as a range in which a torque that may protrude from the member can act on the output shaft.

It is a block diagram which shows the outline of a structure of the motor vehicle 10 in which the power transmission device 20 as one Example of this invention was integrated. It is a block diagram which shows the outline of a structure of the power transmission mechanism 20a of an Example. It is explanatory drawing which shows the mode of the transmission of CVT30. 3 is a configuration diagram showing an outline of a configuration of a slide mechanism 62. FIG. 2 is a configuration diagram showing an outline of a configuration of a narrow pressure adjusting mechanism 50. FIG. It is the elements on larger scale which expanded the narrow pressure adjustment mechanism 50 partially. 4 is a flowchart illustrating an example of a control routine for an output member maximum diameter executed by an electronic control unit 90. It is explanatory drawing which shows an example of the map for target slide distance setting.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of an automobile 10 equipped with a power transmission device 20 as an embodiment of the present invention. As shown in the figure, an automobile 10 according to the embodiment includes an engine 12 as an internal combustion engine that outputs power by explosion combustion of a hydrocarbon-based fuel such as gasoline or light oil, and left and right wheels by shifting power from the engine 12. A power transmission mechanism 20a for transmitting to 88a and 88b and an electronic control unit 90 for controlling the entire vehicle are provided. Here, the power transmission device 20 of the embodiment corresponds to the power transmission mechanism 20a and the electronic control unit 90.

  The power transmission mechanism 20a is configured as a transaxle device that shifts the power input from the engine 12 via a starter (not shown) (for example, a torque converter) and transmits the power to the left and right wheels 88a, 88b. 2, a forward / reverse switching mechanism 24 connected to the output shaft 22 of the starting device and outputting power from the starting device with switching between forward rotation and reverse rotation, and an input connected to the forward / backward switching mechanism 24. A CVT 30 as a continuously variable transmission that has a shaft 32 and an output shaft 38 disposed in parallel to the input shaft 32 and continuously outputs the power input to the input shaft 32 and outputs it to the output shaft 38; It is connected to the output shaft 38 of the CVT 30 via the reduction gear 26 and to the left and right front wheels. And a differential gear 28, which are accommodated in a case 21 made of a transaxle housing 21a and the converter housing 21b and the rear case 21c. In addition, a partition plate 21d that partitions a space in which the forward / reverse switching mechanism 24 and the differential gear 28 are disposed from a space in which the CVT 30 is disposed is provided inside the case 21.

  The forward / reverse switching mechanism 24 includes a double pinion planetary gear mechanism, a brake B1, and a clutch C1. The planetary gear mechanism of the double pinion includes an external gear sun gear 24a, an internal gear ring gear 24b arranged concentrically with the sun gear 24a, a plurality of first pinion gears meshed with the sun gear 24a, and the first pinion gear. A plurality of second pinion gears that mesh with each other and mesh with the ring gear 24b are coupled to each other and a carrier 24c that rotates and revolves freely. The sun gear 24a has an output shaft 22, and the carrier 24c has an input shaft 32 of the CVT 30. Each is connected. The ring gear 24b of the planetary gear mechanism is connected to the case 21 by a brake B1, and the ring gear 24b can be freely rotated or prohibited from rotating by turning on and off the brake B1. The sun gear 24a and the carrier 24c of the planetary gear mechanism are connected by a clutch C1, and the sun gear 24a and the carrier 24c are connected or disconnected by turning on and off the clutch C1. The forward / reverse switching mechanism 24 turns off the brake B1 and turns on the clutch C1 to transmit the rotation of the output shaft 22 to the input shaft 32 of the CVT 30 as it is to advance the vehicle or turn on the brake B1 and turn on the clutch C1. Is turned off, the rotation of the output shaft 22 is converted in the reverse direction and transmitted to the input shaft 32 of the CVT 30 to reverse the vehicle. Further, the output shaft 22 and the input shaft 32 of the CVT 30 can be disconnected by turning off the brake B1 and turning off the clutch C1. In the embodiment, the forward / reverse switching mechanism 24 is constituted by a double-pinion planetary gear mechanism, a brake B1, and a clutch C1, but is constituted by a single-pinion planetary gear mechanism instead of the double-pinion planetary gear mechanism. It is good also as what shall be carried out and it is good also as what shall be set as another structure.

  The CVT 30 includes a conical input cone 34 integrally formed with an input shaft 32, and an output cone 36 that is substantially the same shape as the input cone 34 and is connected to the output shaft 38 so as to be opposite to the input cone 34. The ring 60 is inserted into the input cone 34 and is sandwiched between the input cone 34 and the output cone 36, and a slide mechanism 62 (see FIG. 4) that supports the ring 60 rotatably and allows the ring 60 to slide. And a narrow pressure adjusting mechanism 50 for adjusting the narrow pressure applied to the ring 60 between the input cone 34 and the output cone 36, and the power from the input shaft 32 is generated by sliding the ring 60 by the slide mechanism 62. Change the output speed steplessly And outputs it to the door 38. FIG. 3 shows how the CVT 30 shifts. As shown in the figure, the ring 60 is slid to the front side (left side in FIG. 2) to shift the power from the input cone 34 with a relatively small reduction ratio and transmit it to the output cone 36. By sliding to the back side in the figure (right side in FIG. 2), the power from the input cone 34 is shifted with a relatively large reduction ratio and transmitted to the output cone 36.

  The input cone 34 and the input shaft 32 are rotatable by a bearing 41 formed as a cylindrical roller bearing which is attached to the partition plate 21d at the right end in FIG. 2 and cannot receive a thrust force but can receive a relatively large radial force. And at the left end is rotatably supported by a bearing 42 formed as a tapered roller bearing attached to the transaxle housing 21a and capable of receiving a thrust force. On the other hand, the output cone 36 is rotatably supported by a bearing 45 which is attached to the partition plate 21d and formed as a cylindrical roller bearing at the right end in FIG. 2, and is attached to the transaxle housing 21a and formed as a cylindrical roller bearing at the left end. The bearing 46 is rotatably supported. Further, the output shaft 38 connected to the output cone 36 is rotatably supported by a bearing 49 which is attached to the converter housing 21b and formed as a tapered roller bearing at the right end in FIG.

  As shown in FIG. 4, the slide mechanism 62 extends substantially parallel to the sliding direction of the ring 60 and is fitted to the guide rail 64 as a feed screw that is rotatably supported by the transaxle housing 21a. A slider 66 that has a fitting portion to be fitted and can move along the guide rail 64 without rotating when the guide rail 64 rotates, and is attached to the slider 66 so as to be swingable in the extending direction of the guide rail 64 and U A holding portion 68 that rotatably holds the ring 60 from the side surface by a U-shaped portion having a letter shape, and a motor 70 that rotates the guide rail 64 with a rotating shaft connected to one end of the guide rail 64. In this slide mechanism 62, the guide rail 64 is rotated by the rotational drive of the motor 70, and the slider 66 is moved along the guide rail 64, whereby the ring 60 is moved to the front side (left side in FIG. 2) or the rear side in the figure. Slide to the side (right side in FIG. 2).

  As shown in FIG. 2, the narrow pressure adjusting mechanism 50 is built in the output cone 36, and adjusts the narrow pressure acting on the ring 60 by the input cone 34 and the output cone 36 by a mechanical mechanism. FIG. 5 is a block diagram showing an outline of the configuration of the narrow pressure adjusting mechanism 50, and FIG. 6 is a partially enlarged view of the narrow pressure adjusting mechanism 50 partially enlarged. As shown in FIGS. 5 and 6, the narrow pressure adjusting mechanism 50 is a fixing member that is spline-fitted to a spline formed at the tip of the output shaft 38 and fixed to the output shaft 38 so as not to move in the axial direction. 52, a moving member 54 that is spline-fitted to a spline formed on the inner peripheral surface of the output cone 36 and is formed so as to be movable in the axial direction together with the output cone 36, and a fixed member 52. Between the plurality of hemispherical ball receivers 52 a formed and the plurality of hemispherical ball receivers 54 a formed on the moving member 54, between the fixed member 52 and the moving member 54 And a spring 58 for urging the moving member 54 in the axial direction with the fixing member 52 as a spring receiver, and attached to the output cone 36 And a support member 59 that supports the output cone 36 so as to be movable in the axial direction with respect to the output shaft 38, and converts the torque acting on the output shaft 38 into an axial force to act on the output cone 36. As a result, the narrow pressure of the ring 60 is adjusted. As shown in FIG. 6, when no torque is applied to the output shaft 38, the ball receiver 52 a of the fixing member 52 and the ball receiver 54 b of the moving member 54 are just opposite to each other. Although no force is received (see FIG. 6A), when a torque is applied to the output shaft 38, a twist is generated between the ball receiver 52a of the fixing member 52 and the ball receiver 54a of the moving member 54, thereby fixing the member 52. A force for pushing out the moving member 54 with the ball 56 is generated using the reaction force from (see FIG. 6B). As described above, since the output cone 36 is attached to the moving member 54, the output cone 36 is pushed out as the moving member 54 moves. At this time, the force that pushes out the output cone 36 increases as the torque acting on the output shaft 38 increases, whereby the narrow pressure of the ring 60 is adjusted. Therefore, since the torque acting on the output shaft 38 increases as the speed reduction ratio with respect to the torque input to the input shaft 32 increases, the CVT 30 is adjusted so that the narrow pressure of the ring 60 increases as the speed reduction ratio increases. Will be.

  The electronic control unit 90 is configured as a microprocessor centered on a CPU. In addition to the CPU, a ROM that stores a processing program, a RAM that temporarily stores data, an input / output port, and a communication port are provided. Prepare. The electronic control unit 90 includes signals from various sensors that detect the operating state of the engine 12, and ring positions Pr from a position detection sensor 72 (see FIG. 4) that is attached to the slider 66 and detects the position of the ring 60. Shift position sensor for detecting the rotational speed of the input shaft 32 from the rotational speed sensor attached to the input shaft 32, the rotational speed of the output shaft 38 from the rotational speed sensor attached to the output shaft 38, and the operating position of the shift lever 91 The shift position SP from 92, the accelerator opening Acc from the accelerator pedal position sensor 94 that detects the depression amount of the accelerator pedal 93, and the brake pedal position BP from the brake pedal position sensor 96 that detects the depression amount of the brake pedal 95 And a vehicle speed V from a speed sensor 98 is input through the input port. From the electronic control unit 90, a control signal to the engine 12, a control signal to the clutch C1 and the brake B1 of the forward / reverse switching mechanism 24, a control signal to the motor 70 of the slide mechanism 62 of the CVT 30, and the like are output via the output port. It is output.

  Next, the operation of the power transmission device 20 of the embodiment configured as described above, particularly when the output member has the maximum diameter when the position of the ring 60 is the large-diameter side end of the output cone 36 (position corresponding to the maximum reduction ratio). Will be described. FIG. 7 is a flowchart illustrating an example of the control routine for the maximum output member diameter executed by the electronic control unit 90. This routine is repeatedly executed at predetermined time intervals (for example, every several msec) when the change of the transmission ratio of the CVT 30 is not requested at the maximum output member diameter. Whether or not the maximum diameter of the output member is reached can be determined using the ring position Pr from the position detection sensor 72.

  When the output member maximum diameter time control routine is executed, the CPU of the electronic control unit 90 first inputs an input torque Tin as a torque input to the input shaft 32 (step S100), and based on the input torque Tin. An output torque Tout as a torque acting on the output shaft 38 is estimated (step S110). Here, as the input torque Tin, a value estimated based on the operating state of the engine 12 (rotation speed, intake air amount, etc.) is used. Further, the output torque Tout is determined in advance by experiment or analysis and stored in a ROM (not shown) as a map in relation to the reduction ratio of the input torque Tin and the CVT 30 and the output torque Tout. When the ratio is given, the corresponding output torque Tout is derived and set from the stored map. Since the maximum diameter of the output member is considered now, the maximum reduction ratio can be used as the reduction ratio.

  Subsequently, the output torque Tout is compared with a threshold value Tref (step S120). Here, the threshold value Tref is set so that at least a part of the ring 60 has a lower limit of the output torque Tout at which the input cone 34 may be deformed or slightly smaller than the output torque Tout, deformation of the input cone 34, etc. A lower limit of the output torque Tout that may protrude from the ring 60 (the contact area between the ring 60 and the output cone 36 is reduced) or a torque slightly smaller than that may be determined and used in advance by experimentation or analysis. When the output member has the maximum diameter, a large torque is likely to act on the output shaft 38. Depending on the magnitude of the output torque Tout, a large force is applied to the input cone 34 from the output shaft 38 via the narrow pressure adjusting mechanism 50, the output cone 36, and the ring 60. May cause the input cone 34 to be deformed, leading to a reduction in power transmission performance, or at least a part of the ring 60 to protrude from the output cone 36. The comparison between the output torque Tout and the threshold value Tref in step S120 is processing for determining whether or not there is such a possibility. In order to solve these problems, the strength of the input cone 34 may be improved. In this case, however, the input cone 34 is increased in size and weight.

  When the output torque Tout is less than the threshold value Tref, it is determined that there is no possibility described above, and this routine is terminated as it is. On the other hand, when the output torque Tout is equal to or greater than the threshold value Tref, it is determined that there is the possibility described above, and a predetermined distance Ls1 is set as the target slide distance Ls * of the ring 60 (step S130), and the set target slide distance Ls *. Only the ring 60 is slid to the small diameter side of the output cone 36 to execute the slide processing for rotating the motor 70 (step S140), and this routine is finished. Here, as the predetermined distance Ls1, a distance longer than the movable distance Lomax of the output cone 36 can be used. Here, the movable distance Lomax is set to the position (reference position) of the output cone 36 when no torque acts on the output shaft 38 (when the output cone 36 is not pushed out by the narrow pressure adjusting mechanism 50). On the other hand, this is the maximum distance that the output cone 36 can move by receiving the force from the narrow pressure adjusting mechanism 50, and the positional relationship between the output cone 36 and the case 21, the bearing 46, etc. A distance determined in advance through experiments, analysis, or the like based on the distance that the toe cone 36 can be moved can be used. Thus, when the output torque Tout is equal to or greater than the threshold Tref at the maximum diameter of the output member, sliding the ring 60 to the smaller diameter side of the output cone 36 reduces the reduction ratio and decreases the output torque Tout. The force acting on the input cone 34 from the shaft 38 via the narrow pressure adjusting mechanism 50, the output cone 36, and the ring 60 can be reduced, and deformation of the input cone 34 can be suppressed. As a result, it is possible to suppress a decrease in power transmission performance due to the deformation of the input cone 34, at least a part of the ring 60 protruding from the output cone 36, and a further decrease in power transmission performance due to this.

  According to the power transmission device 20 of the embodiment described above, the output torque Tout as the torque acting on the output shaft 38 when the position of the ring 60 is the maximum diameter of the output member that is the large diameter side end of the output cone 36 is as follows. When the value is equal to or greater than the threshold value Tref, the ring 60 is slid to the smaller diameter side of the output cone 36, so that the deformation of the input cone 34 can be suppressed. In addition, at this time, the ring 60 is slid to the smaller diameter side of the output cone 36 by a predetermined distance Ls1 longer than the movable distance Lomax of the output cone 36, so that the ring 60 is more sure to protrude from the output cone 36. Can be suppressed.

  In the power transmission device 20 of the embodiment, the operation when the position of the ring 60 is the large diameter side end portion of the output cone 36 has been described. However, the operation is not limited to this, and the position of the ring 60 is the large size of the output cone 36. When it is within a predetermined range including the radial end, the same processing as in the embodiment may be performed. Here, the predetermined range is a range in which a torque that may cause deformation of the input cone 34 can act on the output shaft 38, or at least a part of the ring 60 can protrude from the output cone 36 due to deformation of the input cone 34. A range in which a characteristic torque can act on the output shaft 38 can be determined and used in advance by experiment or analysis. For example, the ring 60 obtained based on the specifications of the engine 12 or the reduction ratio at each position of the ring 60 can be used. Can be determined based on the maximum value of the output torque Tout for each of these positions, the specifications of the input cone 34, the output cone 36, the narrow pressure adjusting mechanism 50, the ring 60, and the like. Further, in this case, when the position of the ring 60 is within a predetermined range and the output torque Tout is equal to or greater than the threshold value Tref, the position of the ring 60 tends to become shorter from the predetermined distance Ls1 as it is farther from the large-diameter side end of the output cone 36. The ring 60 may be slid to the smaller diameter side of the output cone 36 by the distance.

  In the power transmission device 20 of the embodiment, when the output torque Tout is equal to or greater than the threshold Tref at the maximum output member diameter, the predetermined distance Ls1 is set to the target slide distance Ls * and the ring 60 is output for the set target slide distance Ls *. Although the slide is made to slide toward the small diameter side of the cone 36, a distance other than the predetermined distance Ls1 (a distance longer or shorter than the predetermined distance Ls1) may be set as the target slide distance Ls *, or the output torque Tout or the ring A distance corresponding to 60 narrow pressure or the like may be set as the target slide distance Ls *. When the target slide distance Ls * is set based on the output torque Tout, the relationship between the output torque Tout and the target slide distance Ls * is determined in advance and stored in the ROM as a target slide distance setting map. If given, the corresponding target slide distance Ls * may be derived from the map and set. An example of the target slide distance setting map is shown in FIG. In the example of FIG. 8, the target slide distance Ls * is set to a predetermined distance Ls1 in the region where the output torque Tout is greater than or equal to the threshold Tref2 greater than the threshold Tref, and in the region where the output torque Tout is greater than or equal to the threshold Tref and less than the threshold Tref2. The larger Tout, the larger the distance toward the predetermined distance Ls1. Here, the threshold value Tref2 is determined based on the lower limit value of the output torque Tout that is assumed that the movement distance from the reference position of the output cone 36 is equal to the movable distance Lomax, a torque slightly smaller than the output torque Tout, or the like. Can be used. The target slide distance Ls * is set in this way when the output torque Tout is equal to or greater than the threshold value Tref and less than the threshold value Tref2. The input cone 34 is deformed as the output torque Tout increases and the ring 60 further moves in the axial direction. This is based on the reason that at least part of the ring 60 moves and easily protrudes from the output cone 36. By setting the target slide distance Ls * in this way, when the output torque Tout is greater than or equal to the threshold Tref and less than the threshold Tref2, the ring 60 can be prevented from sliding more than necessary, and the reduction ratio of the CVT 30 can be reduced. A large change can be suppressed.

  In the power transmission device 20 of the embodiment, the output torque Tout is estimated based on the input torque Tin. However, any device that acquires the output torque Tout may be used. For example, the output torque Tout itself is detected. It is good also as what to do.

  In the power transmission device 20 according to the embodiment, the position detection sensor 72 is attached to the slider 66 and detects the position of the ring 60. However, the position detection sensor 72 may be any apparatus that acquires the position of the ring 60. For example, it is attached to the transaxle housing 21a, the holding portion 68, etc. to detect the position of the ring 60, or is attached to the guide rail 64 to estimate the position of the ring 60 by detecting the position of the slider 66. The detection method may be any method such as a mechanical method or an optical method.

  In the power transmission device 20 of the embodiment, the slide mechanism 62 includes a guide rail 64 that is rotatably attached to the transaxle housing 21a, and can slide along the guide rail 64 without rotating when the guide rail 64 rotates. The slider 66, the holding portion 68 that is attached to the slider 66 and rotatably holds the ring 60, and the motor 70 that rotates the guide rail 64 are configured. However, the reduction ratio can be reduced by sliding the ring 60. Any mechanism can be used as long as it can be changed.

  In the power transmission device 20 of the embodiment, the narrow pressure adjusting mechanism 50 includes a fixing member 52 attached to the output shaft 38, a moving member 54 attached to the output cone 36, and a plurality of members formed on the fixing member 52. The hemispherical ball receiver 52a and the plurality of balls 56 arranged between the plurality of hemispherical ball receivers 54a formed on the moving member 54, the torque acting on the output shaft 38 Any mechanism can be used as long as it can be converted into a force in the direction of the output shaft 38 and applied to the output cone 36. Further, as the torque (output torque Tout) acting on the output shaft 38 estimated from the torque input to the input shaft 32 (input torque Tin) and the transmission ratio of the CVT 30 (the position of the ring 60) increases, It may be configured by a mechanism that adjusts the narrow pressure to the ring 60 using hydraulic pressure or electric power so that the narrow pressure is increased.

  In the power transmission device 20 of the embodiment, the input shaft 32 and the input cone 34 are integrally formed, but may be formed separately.

  In the power transmission device 20 of the embodiment, the power transmission mechanism 20a shifts the power from the engine 12 as a power source and transmits it to the left and right wheels 88a and 88b. Instead of or in addition, a motor may be used. When a motor is used as the power source instead of the engine, the power transmission mechanism 20a may not include the forward / reverse switching mechanism 24.

  In the power transmission device 20 of the embodiment, the power transmission device 20 is mounted on the automobile 10, but may be mounted on a moving body other than the automobile 10, or may be incorporated in a non-moving facility such as a construction facility. .

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the CVT 30 corresponds to a “continuously variable transmission”, the input cone 34 corresponds to an “input member”, the output cone 36 corresponds to an “output member”, and the ring 60 corresponds to a “transmission member”. The slide mechanism 62 corresponds to “slide means”, the narrow pressure adjustment mechanism 50 corresponds to “narrow pressure adjustment means”, the position detection sensor 72 corresponds to “position acquisition means”, and is based on the input torque Tin. The electronic control unit 90 that executes the process of step S110 of the output member maximum diameter control routine of FIG. 7 for estimating the output torque Tout corresponds to the “output torque acquisition means”, and the position of the ring 60 is the size of the output cone 36. When the output torque Tout is greater than or equal to the threshold Tref at the maximum diameter of the output member that is the diameter side end, the ring 60 is slid to the small diameter side of the output cone 36. Electronic control unit 90 executing the processing in steps S130, S140 of the output member up 径時 control routine of FIG. 7 that performs a sliding process corresponds to "slide control means."

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the power transmission device manufacturing industry.

  10 automobiles, 12 engines, 20 power transmission devices, 20a power transmission mechanisms, 21 cases, 21a transaxle housings, 21b converter housings, 21c rear cases, 21d partition plates, 22 output shafts, 24 forward / reverse switching mechanisms, 24a sun gears, 24b Ring gear, 24c carrier, 26 reduction gear, 28 differential gear, 30 CVT, 32 input shaft, 34 input cone, 36 output cone, 38 output shaft, 41, 42, 45, 46, 49 bearing, 50 narrow pressure adjustment mechanism, 52 Fixed member, 52a, 54a Ball receiver, 54 Moving member, 56 Ball, 58 Spring, 59 Support member, 60 Ring, 62 Slide mechanism, 64 Guide rail, 66 Slider, 68 Part, 70 motor, 72 position detection sensor, 88a, 88b wheel, 90 electronic control unit, 91 shift lever, 92 shift position sensor, 93 shift position SP, accelerator pedal, 94 accelerator pedal position sensor, 95 brake pedal, 96 brake pedal Position sensor, 98 vehicle speed sensor, B1 brake, C1 clutch.

Claims (4)

A power transmission device having an input shaft and an output shaft arranged in parallel to the input shaft, and comprising a continuously variable transmission that continuously shifts the power input to the input shaft and outputs the power to the output shaft. There,
A conical input member connected to the input shaft;
A conical output member connected to the output shaft and disposed opposite to the input member;
An annular transmission member that is constricted by the input member and the output member and transmits power between the input member and the output member;
Slide means capable of changing a gear ratio by sliding the transmission member;
Narrow pressure adjusting means for adjusting the narrow pressure acting on the transmission member in a tendency to increase as the output torque, which is the torque acting on the output shaft, increases.
Position acquisition means for acquiring the position of the transmission member;
Output torque acquisition means for acquiring the output torque;
When the acquired position of the transmission member is within a predetermined range including the large-diameter side end of the output member and the acquired output torque is equal to or greater than a predetermined torque, the transmission member is placed on the small-diameter side of the output member. Slide control means for controlling the slide means to slide;
A power transmission device comprising: The power transmission device according to claim 1,
The slide control means is means for controlling the slide means so that the transmission member slides toward the small diameter side of the output member by a distance that is not less than the movable distance of the output member.
Power transmission device. The power transmission device according to claim 1,
The slide control means is means for controlling the slide means so that the transmission member slides toward the small diameter side of the output member by a distance that tends to increase as the acquired output torque increases.
Power transmission device. A conical input member connected to the input shaft, a conical output member connected to the output shaft and disposed in the direction opposite to the input member, and the input member and the output member are subjected to a narrow pressure. An annular transmission member that transmits power between the member and the output member, slide means that can change a gear ratio by sliding the transmission member, and output torque that is torque acting on the output shaft A narrow pressure adjusting means for adjusting a narrow pressure acting on the transmission member so as to increase as it increases, continuously changing the power input to the input shaft and outputting it to the output shaft. A method for controlling a power transmission device including a transmission,
When the position of the transmission member is within a predetermined range including the large-diameter end of the output member and the output torque is equal to or greater than a predetermined torque, the sliding means is configured to slide the transmission member to the small-diameter side of the output member. To control the
A control method for a power transmission device.

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