JPWO2011118529A1 - Power transmission device - Google Patents

Abstract

The output cone is located at a predetermined distance L1 away from the position of the large diameter side end portion of the output cone 36 when no torque is applied to the output shaft 38 to the small diameter side of the output cone 36. A range on the small diameter side of 36 is defined as a slide range. Then, the slide mechanism 62 is controlled so that the ring 60 slides within the slide range. Thereby, deformation of the input cone 34 can be suppressed, and even if the input cone 34 is deformed and the output cone 36 moves further to the smaller diameter side, a part of the ring 60 is prevented from protruding from the output cone 36. Can be suppressed.

Description

  The present invention relates to a power transmission device, and more specifically, has an input shaft and an output shaft arranged in parallel with the input shaft, and continuously rotates the rotation input to the input shaft to the output shaft. The present invention relates to a power transmission device including a continuously variable transmission for output.

  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 on the relatively large diameter side of the output cone (when the reduction ratio is relatively large), 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 is deformed, and at least a part of the ring may protrude from the output cone due to the deformation. For this reason, it is conceivable to improve the strength of the input cone in order to suppress the deformation of the input cone. However, in this case, the input cone is increased in size and weight.

  The main purpose of the power transmission device of the present invention is to suppress the deformation of the input member and the protrusion of the transmission member from the output member due to the deformation.

  The power transmission device of the present invention employs 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 including a continuously variable transmission that has an input shaft and an output shaft disposed in parallel to the input shaft, and that continuously changes the rotation input to the input shaft and outputs the same 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;
A slide mechanism capable of changing a gear ratio by sliding the transmission member;
A narrow pressure adjusting mechanism that adjusts the narrow pressure acting on the transmission member in a tendency to increase as the output torque that is the torque acting on the output shaft increases.
With
The output member is a member that moves in the axial direction of the input member in the axial direction due to the narrow pressure generated by the narrow pressure adjusting mechanism,
Furthermore, the small diameter side of the output member is located at a predetermined distance from the position of the large diameter side end portion of the output member when the torque is not applied to the output shaft to the small diameter side of the output member. Slide range setting means for setting a range as a slide range of the transmission member;
It is a summary to provide.

  In the power transmission device according to the present invention, the output shaft from a predetermined position which is a predetermined distance away from the position of the large-diameter side end portion of the output member when the torque is not applied to the output shaft to the small-diameter side of the output member. The range on the small diameter side is set as the slide range of the transmission member. As a result, even if the input member is deformed and the output member moves in the axial direction (smaller diameter direction), a part of the transmission member protrudes from the output member (the contact area between the transmission member and the output member is reduced). Can be suppressed.

  In such a power transmission device of the present invention, the predetermined distance may be a distance that is not less than a movable distance of the output member. If it carries out like this, it can suppress more reliably that at least one part of a transmission member protrudes from an output member.

  In the power transmission device of the present invention, the slide range setting means may be means for setting the slide range by a mechanical mechanism. The power transmission device of the present invention may further include a slide control means for controlling the slide mechanism so that the transmission member slides within the slide range.

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. 6 is an explanatory diagram showing an example of a slide range of the ring 60. FIG.

  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 back side. Slide to the right (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 the CPU 90a. In addition to the CPU 90a, the electronic control unit 90 includes a ROM 90b for storing processing programs, a RAM 90c for temporarily storing data, an input / output port, and a communication port. 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 A vehicle speed V from a vehicle 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.

  In the power transmission device 20 of the embodiment thus configured, the position (reduction ratio) of the ring 60 of the CVT 30 is controlled by the electronic control unit 90 based on the accelerator opening Acc from the accelerator pedal position sensor 94 and the vehicle speed V from the vehicle speed sensor 98. ) Is adjusted. Specifically, the target position Pr * of the ring 60 corresponding to the target reduction ratio of the CVT 30 is set within the slide range of the ring 60 based on the accelerator opening Acc and the vehicle speed V, and the ring from the position detection sensor 72 is set. The slide mechanism 62 is controlled so that the position Pr matches the target position Pr *. In the embodiment, the torque is not applied to the output shaft 38 (the output cone 36 is not pushed out by the narrow pressure adjusting mechanism 50), and the output is started from the position of the large-diameter side end portion of the output cone 36 when not operating. A range on the small diameter side of the output cone 36 from a position (predetermined position) separated from the small diameter side of the cone 36 by a predetermined distance L1, that is, from the position of the small diameter side end portion of the output cone 36 to the predetermined position when not operating. The range is defined as the slide range of the ring 60 and stored in the ROM 90b. An example of the slide range is shown in FIG. In the example of FIG. 7, the position of the output cone 36 at the time of non-operation (including the position of the end portion on the large diameter side and a predetermined position) is shown. In the embodiment, the predetermined distance L1 is a distance that is equal to or greater than the movable distance Lomax of the output cone 36. Here, the movable distance Lomax is the maximum distance that the output cone 36 can move by receiving a force from the narrow pressure adjusting mechanism 50 with respect to the position (reference position) of the output cone 36 when not acting. Based on the positional relationship between the output cone 36 and the case 21, the bearing 46, etc., the distance that the output cone 36 can be moved by the narrow pressure adjusting mechanism 50, and the like, a distance determined in advance by experiment or analysis is used. Can be used. When the ring position Pr is on the relatively large diameter side of the output cone 36 (when the reduction ratio is relatively large), a large torque is likely to act on the output shaft 38, and depending on the magnitude of the torque, the output shaft 38 A large force acts on the input cone 34 through the narrow pressure adjusting mechanism 50, the output cone 36, and the ring 60 to deform the input cone 34, and at least a part of the ring 60 protrudes from the output cone 34 due to the deformation. there is a possibility. For this reason, it is conceivable to improve the strength of the input cone in order to suppress the deformation of the input cone. However, in this case, the input cone is increased in size and weight. Therefore, in the embodiment, the range on the smaller diameter side of the output cone 36 from the predetermined position is determined as the slide range and stored in the ROM 90b, and the ring 60 slides within the slide range based on the accelerator opening Acc and the vehicle speed V. The slide mechanism 62 was controlled. Thereby, even if the input cone 34 is deformed and the output cone 36 is moved to the small diameter side, it is possible to suppress a part of the ring 60 from protruding from the output cone 36. Moreover, since the predetermined distance L1 is equal to or greater than the movable distance Lomax of the output cone 36, it is possible to more reliably suppress the ring 60 from protruding from the output cone 36.

  According to the power transmission device 20 of the embodiment described above, a predetermined distance from the position of the large diameter side end portion of the output cone 36 when no torque is applied to the output shaft 38 to the small diameter side of the output cone 36 is predetermined. A range on the smaller diameter side of the output cone 36 from a predetermined position that is a distance L1 is determined as a slide range of the ring 60 and stored in the ROM 90b, and the slide mechanism 62 is moved so that the ring 60 slides within the slide range. Therefore, even if the input cone 34 is deformed and the output cone 36 is moved to the smaller diameter side, it is possible to prevent a part of the ring 60 from protruding from the output cone 36. Moreover, since the predetermined distance L1 is equal to or greater than the movable distance Lomax of the output cone 36, it is possible to more reliably suppress the ring 60 from protruding from the output cone 36.

  In the power transmission device 20 according to the embodiment, the output cone 36 is located at a predetermined distance L1 away from the position of the large diameter side end portion of the output cone 36 at the time of non-operation to the small diameter side of the output cone 36. However, the predetermined distance L1 may be a distance shorter than the movable distance Lomax of the output cone 36, for example, a distance slightly shorter than the movable distance Lomax. Even in this case, the protrusion of the ring 60 from the output cone 36 due to the deformation of the input cone 34 is suppressed as compared with the case where the position up to the end of the large diameter side of the output cone 36 at the time of non-operation is included in the slide range. can do.

  In the power transmission device 20 of the embodiment, the range on the smaller diameter side of the output cone 36 from the predetermined position is determined as the slide range of the ring 60 and stored in the ROM 90b, and the slide mechanism 62 is configured so that the ring 60 slides within the slide range. However, instead of or in addition to storing in the ROM 90b, the range on the smaller diameter side of the output cone 36 from the predetermined position may be set as the slide range of the ring 60 by a mechanical mechanism. Good. In this case, for example, the slide range may be set by limiting the movement of the slider 66 by providing a convex portion or the like at a position corresponding to the boundary of the slide range in the guide rail 64.

  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, the hydraulic pressure or the pressure is increased so that the greater the torque acting on the output shaft 38 estimated by the torque input to the input shaft 32 and the transmission ratio of the CVT 30 (the position of the ring 60), the greater the narrow pressure applied to the ring 60. You may comprise as a mechanism which adjusts the narrow pressure to the ring 60 using electric power.

  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 summary section of the invention 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 the “slide mechanism”, the narrow pressure adjustment mechanism 50 corresponds to the “narrow pressure adjustment mechanism”, and the output cone 36 is large when the output shaft 38 is not in operation. The ROM 90b that stores and stores a range on the small diameter side of the output cone 36 from a predetermined position that is a position separated by a predetermined distance L1 from the position of the diameter side end to the small diameter side of the output cone 36 as a slide range. It corresponds to “means”. Further, a mechanical mechanism for setting the slide range of the ring 60 (for example, a convex portion provided on the slider 66) corresponds to the “slide range setting means”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the summary section of the invention is a specific form of the embodiment for carrying out the invention described in the summary section of the invention. Since this is an example for explanation, the elements of the invention described in the summary section of the invention are not limited. That is, the interpretation of the invention described in the Summary of Invention column should be made based on the description in that column, and the examples are only specific examples of the invention described in the Summary of Invention column. It is.

  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.

Claims (4)

A power transmission device including a continuously variable transmission that has an input shaft and an output shaft disposed in parallel to the input shaft, and that continuously changes the rotation input to the input shaft and outputs the same 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;
A slide mechanism capable of changing a gear ratio by sliding the transmission member;
A narrow pressure adjusting mechanism that adjusts the narrow pressure acting on the transmission member in a tendency to increase as the output torque that is the torque acting on the output shaft increases.
With
The output member is a member that moves in the axial direction of the input member in the axial direction due to the narrow pressure generated by the narrow pressure adjusting mechanism,
Furthermore, the small diameter side of the output member is located at a predetermined distance from the position of the large diameter side end portion of the output member when the torque is not applied to the output shaft to the small diameter side of the output member. Slide range setting means for setting a range as a slide range of the transmission member;
A power transmission device comprising: The power transmission device according to claim 1,
The predetermined distance is a distance greater than or equal to the movable distance of the output member.
Power transmission device. The power transmission device according to claim 1 or 2,
The slide range setting means is means for setting the slide range of the transmission member by a mechanical mechanism.
Power transmission device. The power transmission device according to any one of claims 1 to 3,
Slide control means for controlling the slide mechanism so that the transmission member slides within the slide range;
A power transmission device comprising:

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