JP2020019443A - Parking mechanism - Google Patents

Abstract

To provide a parking mechanism which achieves reduction of the number of components to achieve space saving.SOLUTION: A parking mechanism 10 inhibits rotation of a parking gear 14 fixed to a gear shaft 12 to be in a lock state and includes: a cam member 20 attached to an outer periphery of a rod 30 and having cam teeth 25, which may engage with the parking gear, on an outer peripheral surface; and a rotation inhibition member 40 having an inhibition tooth 45 which engages with the cam teeth 25 to inhibit rotation of the cam member 20 around a rod axis. The cam member 20 moves a lock position, at which the cam member 20 engages with the parking gear 14 and the rotation inhibition member 40, and a lock release position, at which the cam member 20 engages with one of the parking gear 14 and the rotation inhibition member 40, in conjunction with movement of the rod 30.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a parking mechanism that suppresses movement of a vehicle during parking or the like.

  2. Description of the Related Art Conventionally, a parking mechanism that locks a part of a power transmission mechanism of a driving wheel when a vehicle such as an automobile is parked to restrain the vehicle from moving is known.

  The parking mechanism generally includes a parking gear fixed to an output shaft of a power transmission mechanism, and a lock mechanism for suppressing rotation of the parking gear. The lock mechanism meshes with the parking gear in a locked state, so that the parking gear (See, for example, Patent Document 1).

  9 and 10 are a front view and a perspective view of a conventional parking mechanism 100. FIG. The parking mechanism 100 includes a parking gear 114 fixed to the output shaft 112, and a lock mechanism having a parking powl 70 that can mesh with the parking gear 114. The parking powl 70 has one end pivotally mounted on the pawl shaft 72. A projection 71 that meshes with the gear teeth 115 of the parking gear 114 is provided at a position separated by a predetermined dimension from the powl shaft 72 in the length direction. Further, the parking powl 70 is biased in a direction in which the convex portion 71 is separated from the parking gear 114 by a pawl biasing member 74 attached to the pawl shaft 72, and a cam that contacts the other end of the parking powl 70. The rotational movement is regulated by the member 120.

  The cam member 120 is a cylindrical member attached to the outer periphery of the rod 130 and has a large-diameter portion 126 having a large radial dimension and a small-diameter portion 128 having a small radial dimension. Are slidably supported in the axial direction. The rod 130 is configured to be able to reciprocate in the axial direction, and the other end of the parking powl 120 contacts the large diameter portion 126 or the small diameter portion 128 of the cam member 120 by the reciprocation of the rod 130.

  In this parking mechanism 100, when the cam member 120 slides on the support member 150 as the rod 130 moves in the axial direction, and the large diameter portion 126 of the cam member 120 rides on the support member 150, the parking powl 70 is moved. , The shaft 71 pivots toward the parking gear 114 with the shaft shaft 72 as an axis, and the projection 71 of the parking powl 70 meshes with the parking gear 114. As a result, a locked state in which the rotation of the parking gear 114 is suppressed is obtained.

  On the other hand, when the small diameter portion 128 of the cam member 120 rides on the support member 150 along with the movement of the rod 130, the parking pawl 70 is moved from the parking gear 114 around the pawl shaft 72 by the urging force of the pawl urging member 74. It turns in the direction to separate, and the convex part 71 of the parking powl 70 and the engagement with the parking gear 114 are released. Thereby, the parking gear 114 enters an unlocked state in which the parking gear 114 can rotate.

JP 2013-209052 A

  In the above-described conventional parking mechanism 100, the parking powl 70 is swung by using the principle of leverage with the poul shaft 72 as a fulcrum and the contact position with the cam member 120 as a power point, so that the parking powl 70 and the parking The gear 114 is configured to be engaged and released. Therefore, it is necessary to provide the parking powl 70 with a sufficient length and a relatively large installation space is required, so that an improvement capable of saving space has been demanded.

  Further, in order to swing the parking powl 70, the powl shaft 72, the powl urging member 74, the cam member 120, the rod 130, the support member 150, and the like are required, and the number of parts is increased. Therefore, an improvement that can reduce the number of parts of the parking mechanism has been required.

  The present invention has been made in view of the above problems, and has as its object to provide a parking mechanism that can reduce the number of components and save space.

  In order to achieve the above object, a parking mechanism according to claim 1 is a parking mechanism that suppresses rotation of a parking gear fixed to a gear shaft to enter a parking state, wherein the parking mechanism extends parallel to the gear shaft. A cam member which is attached to an outer peripheral surface of a rod which can reciprocate in a direction, and has a cam tooth on the outer peripheral surface which can mesh with the parking gear; and a cam member which meshes with the cam tooth of the cam member, around a rod axis of the cam member. A rotation stopping member having a stopping tooth for stopping rotation, wherein the cam member, with the movement of the rod, engages with both the parking gear and the rotation stopping member, and a lock position; It is characterized in that it moves between at least one of the rotation stopping members and an unlocked position where it does not mesh.

  According to this configuration, when the cam member moves to the lock position, the cam member meshes with the parking gear and the rotation restraining member, so that the rotation of the cam member is restrained by the rotation restraining member. The rotation of the gear can be suppressed. On the other hand, when the cam member moves to the unlock position, the cam member does not mesh with at least one of the parking gear and the rotation stopping member, and the parking gear can rotate without being stopped by the rotation stopping member. As described above, by providing the cam teeth on the cam member conventionally used for swinging the parking powl and forming the meshing structure of the cam member and the parking gear, the conventionally required parking powl is not used. In addition, the rotation of the parking gear can be controlled. As a result, the number of parking pouls and the number of shafts can be reduced, and the space of the parking mechanism can be reduced.

  According to a second aspect of the present invention, in the parking mechanism according to the first aspect, the gear teeth mesh with the cam teeth by moving the cam teeth from the unlock position to the unlock position. And / or the stop teeth have a chamfered shape in which the tips facing each other at the unlocked position are tapered.

  According to this configuration, the tip of the cam tooth of the cam member and the gear tooth and / or the stop tooth meshing with the cam tooth by moving the cam member from the unlocked position to the locked position have a chamfered shape. Therefore, the teeth can be smoothly meshed when moved to the lock position.

  According to a third aspect of the present invention, in the parking mechanism according to the first or second aspect, the cam member is rotatable around a rod axis and always meshes with the parking gear. .

  According to this configuration, in the unlocked position, the cam member meshes with the parking gear and rotates around the axis of the rod together with the parking gear, so that the cam member moves from the unlocked position to the locked position and the rotation restricting member moves. When the gears mesh with each other, the cam teeth meshing with the stopping teeth of the rotation stopping member change almost every time. As a result, the use durability of the cam teeth can be increased as compared with the case where the same cam teeth mesh with the stopping teeth each time.

  According to a fourth aspect of the present invention, in the parking mechanism according to the first or second aspect, the cam member always meshes with the rotation stopping member.

  According to this configuration, it is not necessary to rotate the cam member around the axis of the rod, so that the number of cam teeth can be reduced and the member cost can be reduced.

  ADVANTAGE OF THE INVENTION According to the parking mechanism which concerns on this invention, space saving can be achieved by reducing the number of parts.

FIG. 1 is an explanatory diagram of a parking mechanism according to a first embodiment of the present invention. FIG. 4 is a side view showing an unlocked state of the parking mechanism. FIG. 4 is a side view showing a locked state of the parking mechanism. The figure explaining the mode that a cam tooth meshes with a stopping tooth. FIG. 4 is an explanatory diagram of a parking mechanism according to a second embodiment of the present invention. FIG. 4 is a side view showing an unlocked state of the parking mechanism. Side view showing the locked state of the parking mechanism FIG. 9 is an explanatory view of a modified example of the parking mechanism. FIG. 4 is an explanatory view of a conventional parking mechanism. FIG. 10 is a perspective view of the conventional parking mechanism shown in FIG. 9.

(First Embodiment)
FIG. 1 is a front view for explaining a parking mechanism according to a first embodiment of the present invention. FIGS. 2 and 3 are side views of the parking mechanism, respectively. FIG. FIG. 3 shows an allowed unlocked state, and FIG. 3 shows a locked state in which rotation of the parking gear is suppressed. The parking mechanism 10 according to the present invention is applied to, for example, a vehicle such as an automobile or a motorcycle, and locks a part of a power transmission mechanism of a driving wheel during parking or the like to suppress movement of the vehicle.

  The parking mechanism 10 of the present embodiment can be applied to, for example, an automatic transmission mounted on a vehicle such as an automobile. In the automatic transmission, when a driver selects a range position using a select lever installed in a vehicle cabin, an automatic shift operation according to the selected range position is performed. Generally, the range position includes forward (D), reverse (R), neutral (N), and parking (P). In the parking range, rotation of the parking gear 14 of the parking mechanism 10 provided in the transmission is locked. Is done.

  The parking mechanism 10 includes a gear shaft 12 constituting an output shaft of an automatic transmission of a vehicle, a parking gear 14 fixed to the gear shaft 12 and rotating around the axis of the gear shaft 12, and a cam meshable with the parking gear 14. It includes a member 20, a rod 30 to which the cam member 20 is attached, and a rotation stopping member 40 which meshes with the cam member 20 to stop the rotation of the cam member 20 around the rod axis.

  The cam member (that is, an engagement member that engages with the parking gear 14) 20 is attached to the outer periphery of the rod 30 at one end (hereinafter, referred to as a distal end) of the rod 30. In the present embodiment, the rod 30 is formed to have a smaller diameter than the gear shaft 12.

  The cam member 20 includes a cylindrical cam body (that is, a main body portion of an engaging member) 22 mounted on the outer periphery of the rod 30 and a plurality of cam teeth (that is, an engaging member) protruding from the outer peripheral surface of the cam body 22. Engagement teeth) 25. The cam teeth 25 are formed in a size and a shape that mesh with the gear teeth 15 of the parking gear 14, and a plurality of the cam teeth 25 are provided side by side in the circumferential direction of the cam body 22. A bearing (not shown) is provided between the inner peripheral surface of the cam body 22 and the outer peripheral surface of the rod 30, and the cam member 20 is supported on the rod 30 so as to be rotatable around the axis of the rod 30. I have.

  Further, the cam body 22 has one end 22a in the axial direction abutting against the urging means 32 for urging the cam member 20 in the axial direction, and the other end 22b has a stopper for restricting the movement in the axial direction. It is in contact with member 34. In the present embodiment, the biasing means 32 is a coil spring mounted on the outer periphery of the rod 30 and is disposed between the tip of the rod 30 and the cam member 20. The stopper member 34 is formed in a cylindrical shape, and is attached and fixed to the outer periphery of the rod 30. The stopper member 34 is not limited to this, and may be a protrusion projecting from the outer peripheral surface of the rod 30.

  In the illustrated example of the cam member 20, the cam main body 22 includes a large-diameter portion 26 provided with the cam teeth 25, a small-diameter portion 27 having a smaller diameter than the large-diameter portion 26, and a small-diameter portion from the large-diameter portion 26. The cam member 20 is not limited to this, and has a plurality of teeth on the outer peripheral surface like the parking gear 14. The formed disk-shaped gear shape may be used. In the present embodiment, the diameter of the cam body 22 (the diameter of the large diameter portion 26) is smaller than the diameter of the parking gear 14 (the diameter of the root circle), and the number of the cam teeth 25 is the number of the gear teeth 15 Less than the number.

  The rotation stopping member 40 has a main body 42 and stopping teeth 45 protruding from the outer peripheral surface of the main body 42 and capable of meshing with the cam teeth 25. The main body 42 has a substantially rectangular parallelepiped shape and is fixed inside the vehicle using a fastening member 44 such as a bolt and a nut. The shape of the main body 42 is not limited to this, and can be set to a shape that can be easily fixed depending on the installation location. In the present embodiment, one stopping tooth 45 is provided on the main body 42.

  As shown in FIGS. 2 and 3, the rod 30 is arranged to extend in parallel with the gear shaft 12, and transmits power in the axial direction to a base end, which is the other end of the rod 30. Drive mechanism is not connected. With this driving mechanism, the rod 30 is configured to be able to reciprocate in the axial direction. The rod 30 is slidably supported in the axial direction by a support member (not shown). This support member can be formed integrally with the rotation stopping member 40. In the present embodiment, as shown in FIG. 2, the rod 30 moves to the distal end side, and the cam member 20 is moved to the unlocked position where only the parking gear 14 of the parking gear 14 and the rotation restraining member 40 meshes. As shown in FIG. 3, the rod 30 moves to the proximal end side, and the cam member 20 reciprocates between the locking position where it meshes with both the parking gear 14 and the rotation stopping member 40.

  FIG. 4 is a view for explaining the state in which the cam teeth 25 mesh with the stopping teeth 45. FIG. 4A is a view in which the tooth surfaces are developed in the circumferential direction. FIG. FIG. 4B shows a state in which the cam teeth 25 are in the locked position. As shown in FIG. 4A, the cam teeth 25 and the stopping teeth 45 have chamfer shapes in which the tips 25a and 45a facing each other in a non-meshing state are tapered. Further, as shown in FIG. 2, the cam teeth 25 and the stopping teeth 45 have a chamfered shape in which the height of the opposing tooth tips 25a, 45a decreases toward the tip. When the cam member 20 moves to the lock position, as shown in FIG. 1 and FIG. 4B, the stop teeth 45 enter between two adjacent cam teeth 25 and mesh with them.

  Next, the operation of the above-described parking mechanism 10 will be described.

  First, in the automatic transmission of the vehicle, when the range position selected by the select lever is forward (D), reverse (R), or neutral (N), the rod 30 is unlocked as shown in FIG. Set to position. At the unlocked position, the cam teeth 25 of the cam member 20 and the gear teeth 15 of the parking gear 14 mesh with each other, and the cam member 20 and the rotation stopping member 40 are in a non-meshing state. The parking gear 14 and the cam member 20 are rotatable around their respective axes with the rotation of the gear shaft 12 as the output shaft, and the parking mechanism 10 is unlocked.

  When the parking range is selected by the select lever, the driving mechanism moves the rod 30 from the unlocked position to the locked position shown in FIG. Then, the stopping teeth 45 of the rotation stopping member 40 enter between the two adjacent cam teeth 25 of the cam member 20 to be in the meshing state. At this time, the meshing state between the cam teeth 25 and the gear teeth 15 is maintained. The cam member 20 is prevented from rotating by meshing with a rotation stopping member 40 fixed to the vehicle body, and the parking gear 14 meshing with the cam member 20 and the gear shaft 12 to which the parking gear 14 is fixed are prevented from rotating. Is done. As a result, the parking mechanism 10 enters a locked state in which the rotation of the output shaft is restricted.

  If the tip 25a of the cam teeth 25 does not mesh with the tip 45a of the stopping teeth 45 when the rod 30 moves from the unlocking position to the locking position, the cam member 20 will be Due to the pressing force of 45, the rod 30 moves toward the distal end of the rod 30 against the urging force of the urging means 32. Thereafter, when the parking gear 14 slightly rotates and the contact between the tooth tips 25a and 45a is released, the cam member 20 moves to the base end side of the rod 30 by the urging force of the urging means 32, and The teeth 25 and the stopping teeth 45 mesh with each other.

  As described above, the parking mechanism 10 can control the rotation of the parking gear 14 by meshing the parking gear 14, the cam member 20, and the rotation restraining member 40. 10, the number of components of the parking mechanism 10 can be reduced, and the space can be saved by reducing the length of the parking pawl 70 shown in FIG. Can be planned.

  Further, since the tips 25a, 45a of the cam teeth 25 and the stopping teeth 45 have chamfer shapes, respectively, the cam teeth 25 move from the non-meshing state with the stopping teeth 45 shown in FIG. When shifting to the meshing state with the stopping teeth 45 shown in b), the cam teeth 25 and the stopping teeth 45 can be smoothly meshed.

  Further, since the cam member 20 is always engaged with the parking gear 14 and rotates around the axis of the rod 30 with the rotation of the parking gear 14 in the unlocked position, the cam member 20 is locked from the unlocked position. When moving to the position and meshing with the rotation stopping member 40, the cam teeth 25 meshing with the stopping teeth 45 change almost every time. Thereby, the use durability of the cam teeth 25 can be enhanced as compared with the case where the same cam teeth 25 mesh with the locking 45 teeth every time.

(Second embodiment)
Next, a parking mechanism 10 according to a second embodiment of the present invention will be described with reference to FIGS. In each of the drawings, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

  The parking mechanism 10 of the present embodiment includes a gear shaft 12, a parking gear 14 fixed to the gear shaft 12 and rotating around the axis of the gear shaft 12, a cam member 20 meshable with the parking gear 14, a cam member 20, The cam includes a rod 30 to which the cam member 20 is attached, and a rotation stopping member 40 that has a stopping tooth 45 that meshes with the cam member 20 and that stops rotation of the cam member 20 around the rod axis.

  A cam member (that is, an engagement member that engages with the parking gear 14) 20 is attached to the distal end of the rod 30, and includes a cylindrical cam body (an engagement member body) 22 and a cam body 22. It has a plurality of cam teeth (engaging teeth of the engaging member) 25 protruding from the outer peripheral surface. No bearing is provided between the main body 22 and the rod 30. In the cam member 20, the cam teeth 25 have the first cam teeth 23 meshing with the gear teeth 15 of the parking gear 14, and the second cam teeth 24 meshing with the stopping teeth 45 of the rotation stopping member 40. . In the present embodiment, each of the first cam teeth 23 and the second cam teeth 24 is provided one by one. In the present embodiment, the first cam teeth 23 and the second cam teeth 24 have the same shape, but may have different shapes.

  The rotation stopping member 40 has a main body 42 fixed inside the vehicle, and a pair of stopping teeth 45 projecting from the outer peripheral surface of the main body 42 and always meshing with the second cam teeth 24.

  The rod 30 is configured to be able to reciprocate between a lock position moved to the distal end side shown in FIG. 6 and a lock release position moved to the base end side shown in FIG. 7 by a drive mechanism (not shown).

  As shown in FIGS. 6 and 7, the first cam teeth 23 and the gear teeth 15 are in a non-meshing state in the unlocked position, and the first cam teeth 23 and the gear teeth 15 are in the locked position. Are engaged.

  The first cam teeth 23 and the gear teeth 15 have chamfered shapes in which the tips 25a and 15a facing each other in a non-meshing state are tapered. Further, the first cam teeth 23 and the gear teeth 15 have a chamfered shape in which the height of the tooth tips 25a, 15a facing each other decreases toward the tip. When the cam member 20 moves to the lock position, as shown in FIG. 5, the first cam teeth 23 enter between two adjacent gear teeth 15 and mesh with them.

  In the parking mechanism 10 of the present embodiment, when the range position selected by the select lever is forward (D), reverse (R), or neutral (N), the rod 30 is set to the unlocked position by the drive mechanism. As a result, the cam member 20 and the parking gear 14 are disengaged. As a result, the parking gear 14 becomes rotatable with the rotation of the gear shaft 12, which is the output shaft, and the parking mechanism 10 enters the unlocked state.

  On the other hand, when the parking range is selected by the select lever, the rod 30 is moved from the unlocked position to the locked position by the drive mechanism. Then, the first cam teeth 23 of the cam member 20 mesh with the gear teeth 15 of the parking gear 14. The cam member 20 meshes with the rotation stopping member 40, and rotation around the axis of the rod 30 is suppressed, and the rotation of the parking gear 14 meshing with this is also suppressed. The parking mechanism 10 is in a locked state in which the rotation of the output shaft is restricted.

  The parking mechanism 10 of the present embodiment can control the rotation of the parking gear 14 by meshing the parking gear 14, the cam member 20, and the rotation suppressing member 40, as in the first embodiment. It is possible to reduce the number of the parking powl 70, the powl shaft 72, and the poul urging member 74, which are conventionally required, and it is possible to reduce the number of components of the parking mechanism 10 and to save space.

  Further, in the parking mechanism 10 of the present embodiment, since it is not necessary to rotate the cam member 20 around the axis of the rod 30, the number of the cam teeth 25 can be reduced, and the member cost can be reduced. In the present embodiment, no bearing is provided between the cam member 20 and the rod 30. However, even in such a case, the rotation of the cam member 20 is suppressed by the rotation stopping member 40, so that the cam member The rotation of the parking gear 14 around the rod axis can be reliably suppressed, and the rotation of the parking gear 14 can be reliably suppressed in the locked state.

  In addition, the first cam teeth 23 and the gear teeth 15 that mesh with each other by moving from the unlock position to the lock position have chamfered tips 25a and 15a, respectively. The teeth can be smoothly meshed.

  FIG. 8 shows a modification of the parking mechanism 10 according to the second embodiment. As shown in the illustrated example, the first cam teeth 23 of the cam member 20 can be a pair of teeth that sandwich one gear tooth 15 and mesh with the same. In addition, the second cam teeth 24 can be a pair of teeth that sandwich one stopping tooth 45 and mesh therewith. In the first embodiment, the stop teeth 45 of the rotation stop member 40 may be a pair of teeth as shown in FIG.

  Further, the present invention is not limited to the above-described embodiments and modified examples, and various changes can be made without departing from the spirit of the invention.

  For example, in each embodiment, the rotation stopping member 40 is disposed at a position facing the parking gear 14 with the cam member 20 interposed therebetween, but the position of the rotation stopping member 40 is not limited to this. For example, as shown by an alternate long and short dash line in FIG. 8, in a state where the parking gear 14 is engaged with the cam member 20, any position may be used as long as the rotation of the cam member 20 can be suppressed without inhibiting the rotation of the parking gear 14.

  In the above-described embodiment, the position where the rod 30 has moved to the distal end is the lock position, and the position where the rod 30 has moved to the proximal end is the unlock position. However, the distal end is the unlock position and the proximal end is the lock position. Thus, the arrangement positions of the parking gear 12, the cam member 20, and the rotation stopping member 40 may be changed.

  In the above-described embodiment, the cam member 20 meshes with one of the parking gear 14 and the rotation restraining member 40 at the unlocked position. 40 may be in a non-meshing state, and may be in a meshing state with both at the lock position.

Reference Signs List 10 parking mechanism 12 gear shaft 14 parking gear 15 gear teeth 20 cam member 25 cam teeth 30 rod 40 rotation stopping member 45 stopping teeth

Claims (4)

In a parking mechanism that suppresses rotation of a parking gear fixed to a gear shaft and sets a parking state,
A cam member attached to an outer peripheral surface of a rod extending in parallel with the gear shaft and capable of reciprocating in the axial direction, having a cam tooth on the outer peripheral surface capable of meshing with the parking gear;
A rotation stopping member having a stopping tooth that meshes with a cam tooth of the cam member to stop rotation of the cam member around a rod axis,
The cam member moves between a lock position in which the parking gear meshes with both the parking gear and the rotation restraining member with the movement of the rod, and a lock release position in which at least one of the parking gear and the rotation restraining member does not mesh. A parking mechanism characterized by moving.   By moving the cam teeth and the gear teeth and / or the stopping teeth meshing with the cam teeth by moving from the unlocked position to the unlocked position, the tooth tips facing each other in the unlocked position are tapered. The parking mechanism according to claim 1, wherein the parking mechanism has a chamfer shape formed on the vehicle.   The parking mechanism according to claim 1, wherein the cam member is rotatable around a rod axis and constantly meshes with the parking gear.   The parking mechanism according to claim 1, wherein the cam member constantly meshes with the rotation stopping member.

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