JP2016194361A - Selectable one-way clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a selectable one-way clutch that can suppress occurrence of malfunction of unintended rotation of a selector plate.SOLUTION: A selectable one-way clutch 1 includes: a selector plate 4 that is disposed adjacent to a holding plate 2 and is relatively rotatable to the holding plate 2 between a lock position in which a claw member 11 can project from the holding plate 2 and a release position in which the claw member 11 is maintained to be accommodated on the holding plate 2 side; and an addition plate 5 that is disposed between the selector plate 4 and a rotating plate 3 while the relative rotation to the selector plate 4 is restricted to reduce an area of a surface in which the selector plate 4 and the rotating plate 3 face each other.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a selectable one-way clutch capable of selectively exerting the function of a one-way clutch.

  As a selectable one-way clutch, a plate in which a claw member can be protruded and a plate in which a claw member is engaged are formed on the same axis, and the claw member is provided between two plates. Can be selected between a lock mode that allows torque transmission between the two plates only when rotating in a predetermined direction and a release mode that blocks torque transmission between the two plates when rotating in both directions. One is known (Patent Document 1).

JP 2002-514292 A

  The selectable one-way clutch of Patent Document 1 switches between a lock mode and a release mode by rotating a selector plate. Therefore, when the selectable one-way clutch is in an environment immersed in gear oil, it is affected by the viscosity of the gear oil interposed between the plate in which the recess is formed and the selector plate. In particular, when the temperature of the gear oil is low, the viscosity of the gear oil becomes high, so that it is easily affected by the viscosity. When the viscosity of the gear oil increases, the shearing force of the gear oil interposed between the plate in which the recess is formed and the selector plate increases. For this reason, the torque acting on the selector plate due to the rotation of the plate exceeds the torque for holding the selector plate in the release mode, and the selector plate may rotate unintentionally and cause a malfunction that switches from the release mode to the lock mode.

  Therefore, an object of the present invention is to provide a selectable one-way clutch that can suppress the occurrence of malfunctions in which the selector plate rotates unintentionally.

  The selectable one-way clutch of the present invention is provided on the first plate in a state in which the first plate and the second plate arranged on the same axis line can project from the first plate toward the second plate, A claw member that engages with a recess formed in the second plate only when the second plate is in a predetermined rotational direction when protruding from the first plate, and is disposed adjacent to the first plate, and the claw A selector plate that can rotate relative to the first plate between a lock position where the member can protrude from the first plate and a release position where the claw member is kept stored on the first plate side. And between the selector plate and the second plate in a state where relative rotation with respect to the selector plate is restricted, and the selector plate An intervening member and the rate and the second plate to reduce the area facing are those comprising (claim 1).

  According to this selectable one-way clutch, the interposition member provided in a state in which relative rotation with respect to the selector plate is restricted is disposed between the selector plate and the second plate. Since the area where the selector plate and the second plate face each other is reduced by the interposition member, the influence of the viscosity of the gear oil can be reduced even in an environment where the selectable one-way clutch is immersed in the gear oil. That is, the torque acting on the selector plate is reduced by the rotation of the second plate as compared with the case where no interposition member is present. Thereby, generation | occurrence | production of the malfunctioning which a selector plate rotates unintentionally can be suppressed.

  In one aspect of the selectable one-way clutch of the present invention, the selector plate is formed with a through hole that allows the claw member to pass in the locked position, and the selector plate serves as the locking member. An additional plate may be provided in which an opening is formed at a position that coincides with the through-hole in a position and allows the claw member to pass therethrough (Claim 2). According to this aspect, the range in which the facing of the second plate and the selector plate is blocked by the additional plate can be increased to a limit that does not hinder the operation of the claw member, so that the influence of the viscosity of the gear oil can be further reduced. .

  One aspect of the selectable one-way clutch of the present invention is applied to a power transmission device including a planetary gear mechanism housed in a case supplied with gear oil and having at least three rotating elements, and the first plate is fixed to the case. The second plate may be coupled in a state where it can rotate integrally with any one of the three rotating elements of the planetary gear mechanism (Claim 3). According to this aspect, the operation mode is set between the mode in which any one of the three rotating elements of the planetary gear mechanism is fixed to the case by the selectable one-way clutch and the mode in which the rotating element is released. Can be switched. Also, even when maintaining the mode in which the rotating element is released under a condition where the temperature of the gear oil is low, the influence of the viscosity of the gear oil is reduced by the interposition member, so that the selector plate rotates unintentionally and the rotating element becomes the case. The malfunction which switches to the mode fixed with respect to can be suppressed.

  As described above, according to the selectable one-way clutch of the present invention, since the area where the selector plate and the second plate face each other is reduced by the interposed member, even if the selectable one-way clutch is immersed in gear oil, The influence of gear oil viscosity can be reduced. Thereby, generation | occurrence | production of the malfunctioning which a selector plate rotates unintentionally can be suppressed.

The figure which showed the usage example in which the selectable one-way clutch which concerns on one form of this invention was integrated. The figure which showed the selectable one-way clutch of FIG. The figure which showed typically the component of the selectable one-way clutch. The figure which showed a part of holding plate. The figure which showed a part of additional plate. Sectional drawing at the time of the lock mode regarding the VI-VI line of FIG. Sectional drawing at the time of the release mode regarding the VI-VI line of FIG. The figure which showed the speed diagram of the power split mechanism. The figure which showed a part of mesh-shaped member. The figure which showed a part of wheel-shaped member. Sectional drawing regarding the XI-XI line of FIG.

  As shown in FIG. 1, a selectable one-way clutch (hereinafter referred to as a clutch) 1 is incorporated in a hybrid transaxle (hereinafter referred to as a transaxle) TA mounted on a hybrid vehicle. A transaxle TA as a power transmission device includes a power split mechanism 103 in which two planetary gear mechanisms 101 and 102 of a single pinion type are combined, two motor generators 104 and 105, a power split mechanism 103, and each motor And generators 104 and 105 as well as a case 106 for housing other transmission elements.

  The power split mechanism 103 is connected to the sun gear S1 of the first planetary gear mechanism 101 and the sun gear S2 of the second planetary gear mechanism 102, and the carrier C1 of the first planetary gear mechanism 101 and the ring of the second planetary gear mechanism 102. It is configured by being connected to the gear R2. As a result, the power split mechanism 103 has four rotating elements that are differentially rotated with each other. A crankshaft 108a of the internal combustion engine 108 is coupled to the carrier C1 of the first planetary gear mechanism 101. The first motor / generator 104 is connected to the sun gear S1 of the first planetary gear mechanism 101 and the sun gear S2 of the second planetary gear mechanism 102, and the second motor / generator 105 is connected to the ring gear R1 of the first planetary gear mechanism 101. The An output unit 109 for outputting torque to a driving wheel (not shown) is connected to the ring gear R1.

  The clutch 1 functions as a brake that is interposed between the carrier C2 that is one rotating element of the power split mechanism 103 and the case 106. As shown in FIG. 2, when the rotation direction of the carrier C2 is Ra, the clutch 1 allows torque transmission from the carrier C2 to the case 106 to fix the carrier C2 and when the rotation direction is opposite Rb. The lock mode in which the torque transmission is interrupted and the state in which the carrier C2 is released is switched, and the torque transmission from the carrier C2 to the case 106 is interrupted in any of the rotation directions Ra and Rb of the carrier C2, and the carrier C2 The operation mode can be selected between the release mode for maintaining the release state.

  As shown in FIGS. 2 and 3, the clutch 1 includes a holding plate 2 provided on a fixed shaft 110 fixed to the case 106 so as not to rotate around the axis Ax, and a carrier C2 around the axis Ax. A rotating plate 3 provided so as to be integrally rotatable, a selector plate 4 provided between the holding plate 2 and the rotating plate 3 and provided so as to be rotatable around an axis Ax, and the rotating plate 3 and the selector plate 4. And an additional plate 5 as an interposed member disposed between the two plates and fixed to the case 106. The holding plate 2 corresponds to the first plate according to the present invention, and the rotating plate 3 corresponds to the second plate according to the present invention.

  As shown in FIGS. 2, 4, and 6, the holding plate 2 is formed with a plurality of holding chambers 10 that are open on the side facing the rotating plate 3 and are arranged in the circumferential direction. Each holding chamber 10 is provided with one claw member 11 that meshes with the rotating plate 3. Each claw member 11 is attached to the holding plate 2 via a support shaft P so that its base end portion 11a can rotate around an axis Ax1 extending in the radial direction of the holding plate 2 and protrudes toward the rotary plate 3 It is biased by a spring 12. Thereby, each claw member 11 can operate between a state in which it is retracted to the holding plate 2 side and is accommodated in the holding chamber 10 and a state in which it projects from the holding plate 2 toward the rotating plate 3. That is, each claw member 11 is provided on the holding plate 2 so as to be able to protrude.

  As shown in FIGS. 2 and 6, the rotating plate 3 is formed with a plurality of concave portions 15 that are open on the side facing the holding plate 2 and are arranged in the circumferential direction. Each recess 15 has a wall portion 15a against which the tip portion 11b of the claw member 11 abuts when the protruding claw member 11 meshes. Although not shown, the number of the recesses 15 is larger than the number of the claw members 11, and the phase of each recess 15 and the phase of each claw member 11 are different from each other (see FIG. 6). Therefore, a part of the protruding plurality of claw members 11 meshes with a part of the plurality of recesses 15.

  The selector plate 4 is formed with a plurality of through holes 16 in the same phase as each claw member 11 through which a part of the claw members 11 that are arranged in the circumferential direction and project can be passed. Further, the additional plate 5 adjacent to the selector plate 4 and fixed to the case 106 is formed with a plurality of openings 17 that allow passage of the claw members 11 arranged in the circumferential direction and projecting as shown in FIG. Each opening 17 of the additional plate 5 is opened at a position that coincides with each through hole 16 in a state where the selector plate 4 is in the locked position. Therefore, the range in which the additional plate 5 blocks the facing of the rotating plate 3 and the selector plate 4 can be increased to a limit that does not hinder the operation of the claw member 11. Thereby, the influence of the viscosity of the gear oil mentioned later can be reduced further.

  The rotation position of the selector plate 4 is the locking position in FIG. 6 where the claw member 11 can pass through the through hole 16 of the selector plate 4 and the opening 17 of the additional plate 5 and engage with the recess 15 of the rotation plate 3. When the tip 11b of the claw member 11 abuts against the selector plate 4, the projection of the claw member 11 is limited, and the claw member 11 is switched between the release positions in FIG. 7 that can be maintained while being stored on the holding plate 2 side. be able to. Thereby, the lock mode and the release mode described above are selectively performed.

  As shown in FIG. 2, the selector plate 4 is provided with an operating arm 4 a extending in the radial direction. By driving the operating arm 4 a with the drive device 20, the rotational position of the selector plate 4 can be adjusted. Can be switched. The drive device 20 includes an actuator 21 and a transmission mechanism 22 that transmits the operation of the actuator 21 to the operating arm 4 a of the selector plate 4. The actuator 21 includes a main body 23 fixed to the case 106, and a drive rod 24 that can be moved back and forth with respect to the main body 23 and linked to the operating arm 4a. The transmission mechanism 22 is fixed to the case 106 and is compressed between the guide member 25 that guides the drive rod 24 of the actuator 21, the spring seat 26 that is fixed to the drive rod 24, and the guide member 25 and the spring seat 26. And a return spring 27 mounted in

  The state shown by the solid line in FIG. 2 is that the actuator 21 of the driving device 20 is actuated so that the driving rod 24 protrudes from the main body 23 against the elastic force of the turn spring 27 and the selector plate 4 is switched to the locked position. It is a state that has been. The clutch 1 in this state is in the lock mode described above. On the other hand, when the actuator 21 of the drive device 20 is switched from the state shown by the solid line in FIG. 2 to the non-operation state, the drive rod 24 is moved back to the main body 23 side by the elastic force of the return spring 27 and the operation arm 4a is moved. The selector plate 4 is switched to the release position by moving to the position indicated by the two-dot chain line. As a result, the clutch 1 enters the release mode.

  In the lock mode of FIG. 6, the tip portion 11 b of the claw member 11 abuts against the wall portion 15 a of the recess 15 when the rotation direction of the rotary plate 3 is Ra. Therefore, the claw member 11 meshes with the recess 15 of the rotating plate 3 so that the holding plate 2 and the rotating plate 3 are joined to transmit these torques, and the carrier C2 is fixed to the case 106. On the other hand, when the rotation direction of the rotation plate 3 is Rb, the claw member 11 is inclined toward the direction Rb. Therefore, even if the claw member 11 interferes with the recess 15 of the rotation plate 3, the claw member 11 remains in the holding plate 2. It is only pushed back to the side. Therefore, the claw member 11 does not mesh with the recess 15. Therefore, when the clutch 1 is in the lock mode, torque transmission between the holding plate 2 and the rotating plate 3 is cut off and the rotating plate 3 is released when the rotating direction of the rotating plate 3 is Rb.

  On the other hand, in the release mode of FIG. 7, each claw member 11 remains stored on the holding plate 2 side by the selector plate 4 and does not reach the concave portion 15 of the rotating plate 3. Therefore, in the rotating plate 3, torque transmission from the rotating plate 3 to the holding plate 2 is cut off regardless of the rotation direction of Ra and Rb, and the rotating plate 3 is released. The state of the release mode in FIG. 7 is maintained by the elastic force of the return spring 27 described above.

  The clutch 1 is in an environment immersed in gear oil in the case 106, and the gear oil is interposed between the plates 2, 3, 4, and 5. Since the gear oil has viscosity, when the rotating plate 3 rotates, a part of the torque is transmitted to the other plate via the gear oil, so that the clutch 1 is affected by the viscosity of the gear oil.

  When the internal combustion engine 108 is started, the clutch 1 is maintained in the release mode by the return spring 27. As indicated by a broken line in FIG. 8, when starting the internal combustion engine 108 with the vehicle stopped, the carrier C <b> 2 that rotates integrally with the rotating plate 3 rotates forward. Therefore, a torque in a direction from the release position to the lock position acts on the selector plate 4 as the rotary plate 3 rotates. In particular, when the viscosity of the gear oil is high, such as when the internal combustion engine 108 is started for the first time in a low temperature environment, the torque becomes larger than in other environments.

  In such a situation, when the torque acting on the selector plate 4 exceeds the torque generated by the elastic force of the return spring 27, the selector plate 4 rotates unintentionally even though the actuator 21 of the drive device 20 is inactive. As a result, a malfunction that switches to the lock position may occur. Therefore, as the return spring 27, in order to suppress the occurrence of such a malfunction in the release mode, a return spring 27 that generates a torque that can be counteracted with the torque that can be transmitted to the selector plate 4 by the rotation of the rotary plate 3 is adopted. There is a need.

  In the clutch 1, an additional plate 5 fixed to the case 106 is interposed between the rotating plate 3 and the selector plate 4. Therefore, compared to the case where the rotating plate 3 and the selector plate 4 face each other without the additional plate 5, the area where the rotating plate 3 and the selector plate 4 face each other in the clutch 1 is reduced by the additional plate 5. Therefore, the influence of the viscosity of the gear oil can be reduced even in an environment where the clutch 1 is immersed in the gear oil. That is, the torque transmitted to the selector plate 4 by the rotation of the rotating plate 3 is reduced. Thereby, generation | occurrence | production of the malfunction mentioned above in the case of release mode can be suppressed. In addition, since it is possible to adopt a spring having a small spring constant as the return spring 27 compared with the case where the additional plate 5 is not present, the actuator 21 that operates against the elastic force of the return spring 27 has a small output. Can be adopted. Thereby, the energy for operating the actuator 21 can be reduced.

  This invention is not limited to the said form, It can implement with a various form within the range of the summary of this invention. Although the clutch of the said form is incorporated in the transaxle TA which is a power transmission device, and is used as a brake which selectively fixes one element of the planetary gear mechanism, it is only one application example. For example, the clutch of the present invention may be used by being incorporated in an automatic transmission of a power transmission device.

  Although the additional plate 5 of the said form has the advantage which can increase the range in which the facing of the rotation plate 3 and the selector plate 4 is interrupted to the limit which does not interfere with operation | movement of the nail | claw member 11, it is only an example of an interposition member. . For example, the present invention can be implemented by providing the interposition member shown in FIGS. 9 to 11 instead of the additional plate 5.

  FIG. 9 shows a part of a mesh member 30 as an interposition member, and the mesh member 30 is formed of a mesh material in which a plurality of through portions 30a formed in a rectangular shape are regularly arranged. Has been. A plurality of openings 31 that allow passage of the claw member 11 are formed in the mesh-like member 30 in the same manner as the additional plate 5. The mesh member 30 is arranged in a state of being fixed to the case 106 between the rotating plate 3 and the selector plate 4 instead of the additional plate 5, so that the gear oil from the rotating plate 3 to the selector plate 4 is passed through. Torque transmission is limited by the mesh member 30. Therefore, the mesh-like member 30 functions in the same manner as the additional plate 5 and the torque acting on the selector plate 4 with the rotation of the rotary plate 3 is reduced, so that the influence of the viscosity of the gear oil can be reduced.

  FIG. 10 shows a part of a wheel-shaped member 32 as an interposed member. The wheel-shaped member 32 includes a hub 32a located at the center and a plurality of rod-shaped members that extend radially from the hub 32a. A spoke 32b and a rim 32c to which the tip of each spoke 32b is connected are provided. A plurality of window portions 33 that allow passage of the claw member 11 are formed in the wheel-shaped member 32, similarly to the additional plate 5. Each window portion 33 is formed in a frame shape and divides a part of the spokes 32b. By disposing the wheel-shaped member 32 in a state of being fixed to the case 106 between the rotating plate 3 and the selector plate 4 instead of the additional plate 5, the spokes 32 b extending in the radial direction can be connected to the rotating plate 3. Is transmitted to the selector plate 4 via the gear oil by the wheel member 32. Accordingly, the wheel member 32 functions in the same manner as the additional plate 5, and the torque acting on the selector plate 4 with the rotation of the rotating plate 3 is reduced, so that the influence of the viscosity of the gear oil can be reduced. The cross-sectional shape of each spoke 32b may be rectangular or circular. Further, as shown in FIG. 11, the height h of the spoke 32b in the axis Ax direction is preferably closer to the height H of the hub 32a and the rim 32c in the axis Ax direction because torque transmission by gear oil is more easily limited.

  In each of the above embodiments, each of the additional plate 5, the mesh member 30, and the wheel member 32 is formed in a hollow disk shape as a whole, but each interposed member may be a non-circular shape such as a semicircular shape or a rectangular shape. It is also possible to configure a circular shape. Further, the additional plate 5 or the mesh-like member 30 and the wheel-like member 32 are fixed to the case 106 so that the relative rotation with respect to the selector plate 4 is restricted. However, if the free rotation of the additional plate 5 or the like is limited, it may not be completely fixed.

1 Clutch 2 Holding plate (first plate)
3 Rotating plate (second plate)
4 Selector plate 5 Additional plate (intervening member)
11 Claw member 15 Concave portion 16 Through hole 17 Opening portion 30 Mesh member (intervening member)
32 Wheel-shaped member (intervening member)
101 First planetary gear mechanism (planetary gear mechanism)
102 Second planetary gear mechanism (planetary gear mechanism)
106 Case Ax Axis TA Transaxle (Power transmission device)

Claims (3)

A first plate and a second plate disposed on the same axis, and
The second plate is provided on the first plate so as to be able to protrude from the first plate toward the second plate, and when the second plate is in a predetermined rotation direction when protruding from the first plate, the second plate is provided. A claw member that meshes with a recess formed in the plate;
Between the lock position, which is disposed adjacent to the first plate and from which the claw member can protrude from the first plate, and the release position in which the claw member is kept stored on the first plate side. A selector plate rotatable relative to the first plate;
An interposition member disposed between the selector plate and the second plate in a state in which relative rotation with respect to the selector plate is restricted, and reducing an area where the selector plate and the second plate face each other;
Selectable one-way clutch with The selector plate is formed with a through hole that allows the claw member to pass in the locked position.
2. The additional plate is provided with the selector plate having an opening that opens to a position that coincides with the through-hole in the locked position and allows the claw member to pass therethrough. Selectable one-way clutch described in 1. Applied to a power transmission device including a planetary gear mechanism housed in a case supplied with gear oil and having at least three rotating elements;
The first plate is fixed to the case, and the second plate is connected in a state where the first plate can rotate integrally with any one of the three rotating elements of the planetary gear mechanism. Selectable one-way clutch as described.

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