JP2019190515A - Parking lock mechanism - Google Patents

Abstract

To effectively release residual torque remaining in a shaft member at which a lock gear member of a parking lock mechanism is arranged when a parking lock is performed by the parking lock mechanism.SOLUTION: A parking lock mechanism 10 related to one embodiment of a technology in this disclosure is constituted so as to make a parking pole 20 engaged with a parking gear 16 arranged at an output shaft 7B of an automatic transmission 7 when a parking range is selected. Then, the parking lock mechanism 10 comprises a torsional torque release mechanism 50 between the parking gear 10 and the output shaft 7B.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a parking lock mechanism.

  Generally, in an automatic transmission or the like mounted on a vehicle, ranges of P (parking), R (reverse), N (neutral), and D (drive) are set. In such an automatic transmission or the like, a parking lock mechanism is provided. The parking lock mechanism generally operates when the select lever is shifted and the P range (parking range) is selected to lock the rotation of the output shaft of the transmission. An example of this parking lock mechanism is disclosed in Patent Document 1, and includes a parking gear fixed to an output shaft of a transmission, a parking pawl having a pawl portion that can selectively mesh with the parking gear, and a parking pawl. A parking rod having a cam that presses against the parking gear. These are related to lock the rotation of the output shaft by the cam pressing the parking pole as the parking rod moves in the axial direction and engaging the parking gear and the claw portion.

  By the way, in a select operation device widely used in general, the above ranges are arranged in the order of P, R, N, and D, and the select lever is moved in this order. Therefore, in the parking lock mechanism, a strong torque, that is, a torsional torque (torsional force) is applied to the output shaft of the transmission immediately after the selection lever is shifted from the selected state of the R range (reverse lens) to the P range. In some cases, the parking pole may mesh with the parking gear. In this case, such a force is stored as a residual torque on the output shaft of the transmission by the parking lock by the parking lock mechanism. Thereafter, when a shift operation is performed from the P range to the R range, for example, the parking pole is separated from the parking gear and the parking lock is released. However, at this time, the parking pole may be strongly repelled by the above-described residual torque and the parking pole may move rapidly. In this case, when the parking pole that has been disengaged from the parking gear moves in the direction of reengagement with the parking gear and the members collide with each other, an abnormal noise that causes discomfort to passengers including the driver is generated. There is. Patent Document 1 discloses that the idling speed when the R range is selected and when the vehicle is stopped is reduced in order to prevent the occurrence of such abnormal noise.

Japanese Unexamined Patent Publication No. 7-32915

  The technology of Patent Document 1 is directed to reducing the residual torque itself when the R range is shifted to the P range by reducing the idle speed when the R range is selected and when the vehicle is stopped. However, this cannot cope with the case where there is residual torque on the output shaft of the transmission when the parking lock mechanism is operated by shifting from the R range to the P range, and abnormal noise is generated in such a case. There is still potential.

  When the parking lock is performed by the parking lock mechanism, the technology of the present disclosure effectively releases the residual torque if there is residual torque on the shaft member provided with the locking gear member of the parking lock mechanism. The purpose is to do.

  In order to achieve the above object, the technology of the present disclosure includes a locking gear member provided on a shaft member that transmits a rotational driving force from a power source, and a locking arm member, and the arm is attached to the gear member. Provided is a parking lock mechanism configured to perform parking lock by engaging a member, and including a torsion torque release mechanism between the gear member and the shaft member.

  Preferably, the torsion torque releasing mechanism is configured to allow relative rotation of the shaft member relative to the gear member by a predetermined amount or more when the arm member is engaged with the gear member.

  Preferably, the torsion torque releasing mechanism includes a rolling element that is movably provided in a region at least partially defined by the shaft member and the gear member, and the rolling member is attached to the unlocked position in the region. Having an elastic member. In this case, it is preferable that an inclined portion capable of meshing with the rolling elements is formed at each of both end portions of the region in the circumferential direction around the axis of the shaft member. The torsion torque releasing mechanism may further include a pressing mechanism for pressing the rolling element against the shaft member.

  According to the above technique of the present disclosure, when the parking lock is performed by the parking lock mechanism, if there is residual torque on the shaft member provided with the locking gear member of the parking lock mechanism, the residual torque is effective. Can be released.

It is a typical whole lineblock diagram showing an example of vehicles provided with a parking lock mechanism concerning a 1st embodiment of this indication. It is a typical perspective view showing the parking lock mechanism of FIG. It is a figure for demonstrating the example of a connection of a parking gear and the output shaft of an automatic transmission. FIG. 3 is a diagram showing a part of a torsion torque releasing mechanism in the parking lock mechanism of FIG. 2. It is explanatory drawing of the torsion torque release mechanism of FIG. It is a figure showing a part of torsion torque release mechanism in the parking lock mechanism concerning a 2nd embodiment of this indication.

  Hereinafter, an embodiment according to the present disclosure will be described based on the accompanying drawings. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  FIG. 1 is a schematic overall configuration diagram showing a vehicle 1 on which a parking lock mechanism 10 according to the first embodiment is mounted. An output shaft (not shown) of the engine 3 as a power source is connected to the automatic transmission 7 via the torque converter 5. The output shaft 7B of the automatic transmission 7 is connected to left and right rear wheels (drive wheels) RL and RR via a propeller shaft 9A, a differential 9B, and a drive shaft 9C. In FIG. 1, symbols FL and FR indicate steered wheels (front left and right wheels). Note that the configuration of the vehicle 1 does not limit the vehicle to which the technology of the present disclosure is applied.

  Although a detailed description of the automatic transmission 7 is omitted, in the automatic transmission 7, ranges of P (parking), R (reverse), N (neutral), and D (drive) are set. In response to this, the engagement of the clutch or the like is connected or released. The engaging operation of the clutch and the like is performed by a hydraulic system (not shown). The driver operates the select lever (or shift lever) 14 of the select operation device (or shift operation device) 12 shown in FIG. 2 in any range of P, R, N, and D (not shown) (corresponding lever position). The desired range is selected by shifting to. In the select operation device 12, lever positions corresponding to the ranges of P, R, N, and D are determined in this order. Note that the selectable range in the select operation device 12 is not limited to P, R, N, and D. For example, the D range is an H (high) range, and a gear stage having a larger gear ratio than the gear range of the H range. And an L (low) range corresponding to.

  In this automatic transmission 7, when the select lever 14 of the select operating device 12 is shifted and the P range (parking range) is selected, the rotation of the output shaft 7B of the automatic transmission 7 is locked and the vehicle A mechanism for preventing unintended movement, that is, a parking lock mechanism 10 is provided. A schematic perspective view of the parking lock mechanism 10 is shown in FIG.

  The parking lock mechanism 10 is swingable via a support shaft 18 to a parking gear 16 provided on the output shaft 7B of the automatic transmission 7 and a transmission case (not shown) of the automatic transmission 7, that is, a fixing member. A parking rod 20 having a pawl 20 provided with a pawl portion 20A that selectively engages with the parking gear 16 and a cam 22 for pressing the parking pawl 20 against the parking gear 16 when the parking range is selected. 24, a spring 26 that biases the cam 22, and a block 28 that supports the cam 22. Further, the operating lever 14 of the shift operating device 12 is connected to the base end side of the parking rod 24 via a swingable intermediate lever mechanism 30 and a wire 32. The parking gear 16 corresponds to a locking gear member, the parking pole 20 corresponds to a locking arm member, the pawl portion 20A of the parking pole 20 corresponds to a meshing portion, and the output shaft 7B of the automatic transmission 7 is powered. It corresponds to a shaft member that transmits the rotational driving force from the source.

  When the P range is selected, the parking lock mechanism 10 is configured to lock the parking pole 16 by engaging the parking pole 16 with the parking gear 16 provided on the output shaft 7B of the automatic transmission 7. . When the driver selects and operates the shift lever 14 at the lever position corresponding to the P range, the parking rod 24 and the cam 22 are shown in the axial direction of the parking rod 24 as the intermediate lever mechanism 30 rotates. 2 is moved in the direction of the arrow AR1, and the parking pole 20 is pressed against the parking gear 16 by the cam 22. Accordingly, the pawl portion 20A of the parking pole 20 meshes with the tooth groove 16s (between the teeth 16t) of the parking gear 16 to lock the rotation of the parking gear 16, that is, the output shaft 7B of the automatic transmission 7, thereby The state is to be established.

  On the other hand, when the driver operates the shift lever 14 from the P range to a position corresponding to another range (for example, N range, R range, or D range), the parking rod 24 and the intermediate lever mechanism 30 are rotated. The cam 22 is moved in the direction of the arrow AR2 in FIG. 2 (out of the axial direction of the parking rod 24), and the parking pole 20 is released from being pressed by the cam 22. As a result, the parking pole 20 is separated from the parking gear 16 by its own weight, and the engagement between the pawl portion 20A of the parking pole 20 and the tooth groove 16s of the parking gear 16 is released, so that the parking state is released. ing. The parking pole 20 may be always urged in a direction away from the parking gear 16 by a return spring (not shown). In this case, the parking pole 20 is released from being pressed by the cam 22, whereby the parking pole 20 is separated from the parking gear 16 by the urging force of the return spring, that is, the spring force.

  By the way, as described above, in the select operation device 12, the range, that is, the lever position is set in the order of P, R, N, and D, and the select lever 14 is moved in this order. Therefore, in the parking lock mechanism 10, when the select lever is shifted from the selected state of the R range to the P range, a strong torque, that is, a torsion torque (torsional force) is applied to the output shaft 7B of the automatic transmission 7. In some cases, the parking pole 20 may mesh with the parking gear 16. In this case, such a force is stored as a residual torque on the output shaft 7B of the automatic transmission 7 when the parking lock mechanism 10 locks the parking. Thereafter, when the select lever 14 is shifted from the P range to the R range, for example, the parking pole 20 is separated from the parking gear 16 and the parking lock is released. However, at this time, if the residual torque is stored in the output shaft 7B, the parking pole 20 is strongly repelled by the residual torque and the parking pole 20 moves rapidly. May move in the direction of re-engagement with the parking gear 16 and the members may collide, so that there is a possibility that an abnormal noise that causes discomfort to the occupant may occur. In order to prevent the occurrence of such abnormal noise, the parking lock mechanism 10 is provided with a mechanism for releasing such a torsion torque, that is, a torsion torque releasing mechanism 50.

  The torsion torque releasing mechanism 50 is provided between the parking gear 16 and the output shaft 7 </ b> B that is a shaft member of the automatic transmission 7. In the parking lock mechanism 10 according to this embodiment, the parking gear 16 is not fixed to the output shaft 7B so that the torsion torque releasing mechanism 50 can be provided. In other words, the parking gear 16 is provided with respect to the output shaft 7B so as to be relatively rotatable around the axis (center axis) 7C of the output shaft 7B. The inner peripheral surface 16A (which defines the through hole) of the parking gear 16 is smooth and is configured to slide along the outer peripheral surface 7E of the output shaft 7B. In order to position the parking gear 16 at a predetermined position in the direction of the axis 7C of the output shaft 7B, a holding member H for holding the parking gear 16 and holding it here (schematically shown in FIG. 2) is provided. Provided. However, the present invention is not limited to such a holding member H, and various members or mechanisms may be employed. For example, an engagement step (not shown) or the like may be provided on the output shaft 7B. The relative rotation between the parking gear 16 and the output shaft 7B around the axis 7C (circumferential direction) of the output shaft 7B in the torsion torque releasing mechanism 50 is performed when the parking pole 20 is engaged with the parking gear 16. It is only necessary that the remaining torsional torque can be released to some extent on the basis of the meshed state, that is, at least a predetermined amount (that is, a predetermined amount or more). Therefore, if the relative rotation of the predetermined amount or more is possible in such a case, a convex portion 16B is provided on the inner peripheral surface 16A of the parking gear 16, as schematically shown in FIG. May be provided on the outer peripheral surface 7E of the output shaft 7B. Of course, a concave portion may be provided on the parking gear 16 side and a convex portion may be provided on the output shaft 7B side. . The parking gear 16 is coaxially disposed on the radially outer side of the output shaft 7B of the automatic transmission 7.

  The torsion torque releasing mechanism 50 is a ball that is movably provided in a region MS partially defined by a recess 52 formed on the inner peripheral surface 16A of the parking gear 16 (forming a part of the inner peripheral surface 16A). A member 54 and a spring member 56 (56A, 56B) for urging the ball member 54 in the region MS are provided. The region MS is partly formed by the parking gear 16 and the output shaft 7B, and both ends of the output shaft 7B in the direction of the axis 7C are partitioned by the holding member H. However, the region MS may be entirely defined by the parking gear 16 and the output shaft 7B.

  In the present embodiment, the torsion torque releasing mechanism 50 has three relative rotation allowance sets S including a ball member 54 and a spring member 56. The three sets S are arranged at equal intervals in the circumferential direction, that is, at intervals of about 120 °. In FIG. 2, only two sets S of the three sets S are shown in a simplified manner. The number of sets S may be one or more, and the plurality of sets S is not limited to being arranged at equal intervals, and may be arranged at unequal intervals.

  Each set S in the torsion torque releasing mechanism 50 has the same configuration. Therefore, in the following, one set S ′ (see FIG. 2) of the three sets S in the torsion torque releasing mechanism 50 will be described.

  FIG. 4 is a diagram illustrating the set S ′ from the direction along the axis 7C of the output shaft 7B. The concave portion 52 provided in the inner peripheral surface 16A of the parking gear 16 extends in the circumferential direction along the inner peripheral surface 16A, and inclined portions (cam portions) 52a, 52b at both ends in the circumferential direction, and these inclined portions 52a, 52b and an intermediate portion 52c extending substantially parallel to the outer peripheral surface 7E of the output shaft 7B facing each other. The two inclined portions 52a and 52b are formed substantially symmetrically with respect to each other. Each of the two inclined portions 52a and 52b defines an inclined surface. Unlike the intermediate portion 52c, the inclined portions 52a and 52b are formed so that the ball member 54 can be engaged as described below. In each of the inclined portions 52a and 52b, holes 58a and 58b as spring fixing portions are formed so as not to prevent the engagement of the ball member 54. The spring fixing portion may be formed to open to the inner peripheral surface 16A, that is, as a groove portion, in addition to being provided as the hole portions 58a and 58b so as to open to the inclined portions 52a and 52b. When the spring fixing portion is formed as a groove portion, the attachment of the spring member 56 becomes easier.

  The ball member 54 is provided as a rolling element. The ball member 54 is movable in the circumferential direction mainly in an area SA defined by the intermediate portion 52c in the recess 52 and the outer peripheral surface 7E of the output shaft 7B, and the outer periphery of the inclined portions 52a, 52b in the recess 52 and the output shaft 7B. In a substantially wedge-shaped region SB that is mainly partitioned by the surface 7E, it is formed so as to be able to fit between them. Accordingly, when the ball member 54 is in the region SA, relative rotation between the parking gear 16 and the output shaft 7B is allowed, and when the ball member 54 is in meshing state in the region SB, the parking gear 16 and the output shaft 7B are Can move together in an engaged state, that is, a locked state. Therefore, the area SA may be referred to as a non-lock area, and the area SB may be referred to as a lock area. The area MS including these areas SA and SB is an area in which the ball member 54 is movably accommodated, and may be referred to as a movable accommodation area.

  The spring member 56 is an elastic member and includes two spring members 56A and 56B. Here, the two spring members 56A and 56B are each configured as a coil spring. However, the spring member 56 may be configured as another elastic member, for example, an accordion spring. The two spring members 56 </ b> A and 56 </ b> B are provided in the recess 52 so as to hold the ball member 54 from both sides in the circumferential direction thereof. The spring members 56A and 56B are provided in the corresponding holes 58a and 58b, respectively. One end of each of the spring members 56A and 56B is simply provided so as to be in contact with the bottom of the corresponding hole 58a or 58b, but may be fixed to the bottom. A ball member 54 is disposed between the other end of one spring member 56A and the other end of the other spring member 56B so as to be pressed by them. When the rotational drive force is not transmitted to the special output shaft 7B, the ball member 54 is positioned in the non-lock region SA, that is, in the neutral non-lock position in the non-lock region SA by the urging force of the spring members 56A and 56B. Can be.

  Now, the operation of the torsion torque releasing mechanism 50 having the above-described configuration will be described based on the schematic diagram of FIG. FIG. 5A corresponds to FIG. 4 and shows a state where the ball member 54 is in the area SA, that is, the non-locking area, and the parking gear 16 and the output shaft 7B of the automatic transmission 7 can be rotated relative to each other. An arrow A11 in FIG. 5A indicates that the parking gear 16 can move in both directions in the circumferential direction with respect to the output shaft 7B, and an arrow A21 in FIG. On the other hand, it represents that it can move in both directions in the circumferential direction.

  FIG. 5B shows a state example of the torsion torque releasing mechanism 50 when the select lever 14 is shifted to the R range. In this case, the output shaft 7B of the automatic transmission 7 rotates in the direction of arrow A22 in FIG. As a result, the ball member 54 is rotated by a frictional force with the output shaft 7B as the output shaft 7B rotates, and the lock region SB on the left side in FIG. 5B on the rotation direction side (FIGS. 4 and 5). (B) (see reference numeral “SB1” in FIG. 2), and it comes to mesh between the inclined portion 52a and the outer peripheral surface 7E of the output shaft 7B. Therefore, the parking gear 16 and the output shaft 7B are locked due to the wedge action of the ball member 54 in the lock region SB1. Thereby, the parking gear 16 rotates integrally with the output shaft 7B. Thus, when in the meshing state in the lock region SB1, the ball member 54 functions as a torque transmission member. When the select lever 14 is selected to the D range, although not shown, the output shaft 7B rotates in the direction opposite to the arrow A22 direction in FIG. 5B, and the lock region SB ( 4 and FIG. 5B, the ball member 54 moves to lock the parking gear 16 integrally with the output shaft 7B.

  As shown in FIG. 5B, in a state where the R range is selected, the driver depresses a brake pedal (not shown) to stop the vehicle 1, and the select lever 14 is shifted to the P range. Then, as described above, the claw portion 20A of the parking pole 20 meshes with the tooth groove 16s of the parking gear 16 as shown in FIG. As a result, the rotation of the parking gear 16 is locked.

  When the state shown in FIG. 5C is reached, since the R range has been selected so far, the torsion torque in the direction of arrow A22 in FIG. 5B on the output shaft 7B due to the hydraulic pressure of the automatic transmission 7 Will be described below as a residual torque. In this case, in the direction of releasing the residual torque, that is, in the direction of the arrow A23 in FIG. 5C opposite to the arrow A22 in FIG. 5B, the output shaft 7B moves relative to the locked parking gear 16. Try to move. As a result, as shown in FIG. 5 (d), the output shaft 7B rotates while the parking gear 16 is locked, and the ball member 54 is rotated along with the rotation so that the engagement state in the lock region SB1 is released. It moves to the non-lock area SA. That is, the output shaft 7B rotates relative to the parking gear 16 so as to release the residual torsion torque. Thereby, the residual torque of the output shaft 7B is released, or the residual torque that causes the noise is released. As shown in FIG. 5D, the circumferential length of the recess 52, that is, the region MS is designed so that the ball member 54 can move in the recess 52, that is, the region MS to such an extent that the residual torsion torque can be sufficiently released. Has been. The circumferential length corresponds to the predetermined amount. However, due to this relative rotation, the ball member 54 moves from the region SB1 at one end of the concave portion 52 when the P range is selected to the region SB2 at the other end, and the output shaft 7B is returned to the parking gear 16 again. May be locked.

  Thereafter, FIG. 5E shows the time when the select lever 14 is moved from the P range to another range, for example, the N range. By operating the select lever 14, the claw portion 20 </ b> A of the parking pole 20 is separated from the tooth gap 16 s of the parking gear 16. As a result, the parking gear 16 can move relative to the output shaft 7B. In the case of FIG. 5E, since the ball member 54 is in a sliding state on the outer peripheral surface 7E of the output shaft 7B, the ball member 54 can be moved to the neutral position by the urging force of the spring members 56A and 56B. However, it is also possible that the parking gear 16 is relatively rotated in the direction of the arrow A12 in FIG. 5 (e) so that the ball member 54 is positioned at the unlocked position of the region MS. The state after the relative rotation of the parking gear 16 is shown in FIG. In the state of FIG. 5 (f), the parking gear 16 can move in both directions in the circumferential direction with respect to the output shaft 7 B (see arrow A 13 in FIG. 5 (f)). Thus, it can move in both directions in the circumferential direction (see arrow A24 in FIG. 5 (f)).

  As described above, the parking lock mechanism 10 is provided with the torsion torque releasing mechanism 50 having the above-described configuration, so that when the P range is selected and the parking port 20 is engaged with the parking gear 16, the parking gear 16 is automatically engaged. Relative rotation of the output shaft 7B of the transmission 7 over a predetermined amount is allowed. Therefore, when the residual torsion torque is stored in the output shaft 7B, the torque can be sufficiently released by the relative rotation of the output shaft 7B with respect to the parking gear 16 in the locked state. Therefore, after that, when the select lever 14 is shifted from the P range to another range, it is possible to prevent the noise from being generated due to the operation.

  Further, the torsion torque releasing mechanism 50 is configured to be able to release torsion torque, and on the other hand, lock regions SB (SB1, SB2) partitioned by the inclined portions 52a, 52b and the like at both ends of each set S. ) Is formed. Therefore, when the P range is selected, the relative rotation of the output shaft 7B is allowed to release the residual torque that may cause abnormal noise, but more than that, that is, the second predetermined amount equal to or greater than the predetermined amount. The relative rotation of the output shaft 7B is prevented. Therefore, according to the torsion torque release mechanism 50, the residual torsion torque can be released, but the rotation of the output shaft 7B of the automatic transmission 7 by the parking lock mechanism 10 is locked to prevent unintended movement of the vehicle. The initial effect can be firmly secured.

  In the torsion torque releasing mechanism 50 in the first embodiment, the ball member 54 is used as the rolling element, but the rolling element is not limited to being a ball member, that is, a ball body. For example, the rolling element may be a roller member.

  Next, a parking lock mechanism according to a second embodiment of the present disclosure will be described. The parking lock mechanism of the second embodiment is different from the parking lock mechanism 10 of the first embodiment in the configuration of each set S of the torsion torque releasing mechanism 50. Hereinafter, only the difference will be described with reference to FIG. FIG. 6 is a view showing one set S ′ of the three sets S of the torsion torque releasing mechanism 50 of the parking lock mechanism in the second embodiment, and corresponds to FIG. 4 in the first embodiment. In the second embodiment, the changes described with respect to the first embodiment can be similarly applied.

  In the second embodiment, one set S (S ′) is in a region MS partially defined by the recess 52 formed on the inner peripheral surface 16A of the parking gear 16 and the outer peripheral surface 7E of the output shaft 7B. In addition to the movable ball member 54 and the spring member 56 for biasing the ball member 54 in the region MS, a pressing mechanism 70 is provided. The pressing mechanism 70 includes a plate member 72 as a pressing member and rubber members 74 (74A, 74B) as second elastic members.

  Here, in the second embodiment, the spring member 56 includes spring members 56C and 56D. The spring members 56C and 56D are each configured as an accordion spring. One end of each of the spring members 56C, 56D is fixed to the corresponding spring holding member 76A, 76B. The ball member 54 is sandwiched and held between the other ends of the spring members 56C and 56D. The spring holding members 76A and 76B are fitted between the inclined portions 52a and 52b of the recess 52 and the outer peripheral surface 7E of the output shaft 7B. However, the region where the spring holding members 76A and 76B are fitted so as to sufficiently enable the engagement in the lock regions SB (SB1 and SB2) of the ball members 54 ′ and 54 ″ shown by broken lines in FIG. It is stipulated not to interfere with.

  The pressing mechanism 70, in other words, the above-described plate, presses the ball member 54 movably provided between the spring members 56C and 56D thus provided against the outer peripheral surface 7E of the output shaft 7B while maintaining the movement in the circumferential direction. A member 72 and the rubber member 74 (74A, 74B) are provided. The plate member 72 is provided so as to extend substantially parallel to the outer peripheral surface 7E of the output shaft 7B over the entire region substantially corresponding to the non-lock region SA, and is fixed to the recess 52. The plate member 72 is fixed via a rubber member 74. The rubber member 74 can be slightly elastically deformed in the direction indicated by the arrow AP in FIG. The rubber member 74 is provided through the plate member 72 so as to press the spherical member 54 against the curved outer peripheral surface 7E of the output shaft 7B. In FIG. 6, two rubber members 74A and 74B are shown, but the number of rubber members in each set S may be one or three or more.

  The size and elastic force of the rubber member 74 enable the parking gear 16 and the output shaft 7B to rotate relative to each other, and the ball member 54 is moved by the frictional force between the output shaft 7B and the output shaft 7B. Designed to make it easier to carry around. Therefore, according to the second embodiment of the present disclosure, when the R range or the D range, that is, the travel range is selected, the ball member 54 is more preferably moved to the lock region SB, and the parking gear 16 is moved to the output shaft 7B. Can be locked. Further, for example, when the shifting operation is performed from the R range to the P range, the parking lock mechanism is activated, and the parking pole 20 is engaged with the parking gear 16, if the output shaft 7B has a residual torsion torque, the torque As the output shaft 7B rotates due to the above, the ball member 54 can move to the non-lock region SA more quickly.

  Thus, according to the second embodiment, the ball member 54 is maintained in a state of being pressed against the outer peripheral surface 7E of the output shaft 7B with an appropriate force (pressure equal to or lower than a predetermined pressure). The ball member 54 can be moved more suitably with the rotation. Therefore, the responsiveness of the torsion torque release mechanism can be improved more suitably.

  In addition, this indication is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this indication, it can change suitably and can implement. For example, a partial combination of the first embodiment and the second embodiment is possible. For example, the torsion torque release mechanism in the first embodiment can be provided with the pressing mechanism 70 in the second embodiment.

  Further, for example, the parking lock mechanism 10 is not limited to the structure shown in FIG. 2, and may have another known structure. Further, in the parking lock mechanism 10, the engagement operation of the parking pole with respect to the parking gear when the P range is selected is performed by a mechanical mechanism. However, the parking lock mechanism 10 is not limited thereto, and is performed by, for example, an electric mechanism with motor driving. Also good.

  Moreover, in the said embodiment, although the shaft member which transmits the rotational drive force from a motive power source was the output shaft of the automatic transmission, it is not limited to this. For example, the parking lock mechanism according to the present disclosure may be applied to a shaft member of a transmission such as an automatic manual transmission (AMT), for example, an output shaft.

  In the above embodiment, the recess 52 is provided on the inner peripheral surface 16 </ b> A of the parking gear 16. However, the recess 52 may be formed on the outer peripheral surface 7E of the output shaft 7B of the automatic transmission 7. In addition, a concave portion is formed on the inner peripheral surface 16A of the parking gear 16, and a concave portion is formed on the outer peripheral surface 7E of the output shaft 7B of the automatic transmission 7. By combining these, the region MS in which the ball member 54 is movable is provided. (SA, SB) may be partitioned.

1 Vehicle 3 Engine 5 Torque converter 7 Automatic transmission 7B Output shaft (shaft member)
DESCRIPTION OF SYMBOLS 10 Parking lock mechanism 12 Select operating device 14 Select lever 16 Parking gear (locking gear member)
20 Parking pole (arm member for lock)
20A Claw 22 Cam 24 Parking rod 26 Spring 28 Block 50 Torsion torque release mechanism 52 Recess 54 Ball member (rolling element)
56, 56A, 56B Spring member (elastic member)
70 pressing mechanism 72 plate member (pressing member)
74, 74A, 74B Rubber member (second elastic member)

Claims (5)

A locking gear member provided on a shaft member for transmitting a rotational driving force from a power source and a locking arm member are provided, and the parking lock is performed by engaging the arm member with the gear member. A parking lock mechanism,
A torsion torque release mechanism is provided between the gear member and the shaft member;
Parking lock mechanism. The torsion torque releasing mechanism is configured to allow relative rotation of the shaft member relative to the gear member by a predetermined amount or more when the arm member is engaged with the gear member.
The parking lock mechanism according to claim 1. The torsion torque releasing mechanism includes a rolling element that is movably provided in a region at least partially defined by the shaft member and the gear member, and an elastic force that biases the rolling member to an unlocked position in the region. Having a member,
The parking lock mechanism according to claim 1 or 2. In each of both end portions of the region in the circumferential direction around the axis of the shaft member, an inclined portion that can mesh with the rolling elements is formed,
The barking lock mechanism according to claim 3. The torsion torque release mechanism further includes a pressing mechanism for pressing the rolling element against the shaft member.
The parking lock mechanism according to claim 3 or 4.

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