JP2006300100A - Parking lock device of transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a parking lock device of a transmission easily assemblable and capable of holding a parking pole at a non-engaged position without impairing the feeling of smooth operation by an operator. <P>SOLUTION: This parking lock device 10 of the transmission comprises an energizing means 31 formed in a band plate shape supported, at its base end part 32, on a housing 3 and energizing the parking pole 21 in a lock releasing direction by the contact of its tip part 33 with the parking pole 21. Accordingly, since a mounting operation for mounting the energizing means 31 on the housing 3 can be performed separately from a mounting operation for the parking pole 21, the assemblability of the parking lock device 10 can be increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a parking lock device for a transmission, and more particularly to a parking lock that biases a parking pole of a parking lock device used in a transmission in a lock release direction away from a parking gear to maintain the parking lock released. Relates to the device.

  2. Description of the Related Art Conventionally, a parking lock device for a transmission used in a vehicle such as an automobile includes a parking gear coaxially connected to a rotation shaft of the transmission, a locking direction approaching the outer peripheral surface of the parking gear, and an outer peripheral surface of the parking gear. A parking pole that is supported by the transmission housing so as to be swingable in the unlocking direction away from the engagement and engages with a gear groove that is recessed in the outer peripheral surface of the parking gear by swinging in the locking direction. Have.

  A helical spring that is fitted on the swinging central axis of the parking pole and biases the parking pole in the unlocking direction, and a helical spring that moves the parking pole in a direction perpendicular to the swinging direction of the parking pole. And a cam mechanism for urging in the locking direction against the urging force.

  According to the above configuration, the parking pole is biased in the separating direction by the biasing force of the helical spring, and the engagement between the engagement pawl of the parking pole and the gear groove of the parking gear is released from the disengaged position. By moving the cam mechanism, the parking pole can be urged in the approaching direction to engage the engagement pawl of the parking pole with the gear groove of the parking gear, and the swing shaft of the transmission can be swung to the locked engagement position. .

  Then, the biasing of the parking pole due to the movement of the cam mechanism is released, and the parking pole is swung in the unlocking direction by the biasing force of the helical spring, so that the engaging pawl of the parking pole and the parking gear gear The disengaged position where the engagement with the groove is released can be achieved.

  Also, a plate spring is provided on a push rod that swings the locking arm toward the parking gear when the P range is selected, and the locking spring biases the locking arm away from the parking gear when the P range is not selected. A parking device for an automatic transmission having the above has been proposed (see, for example, Patent Document 1).

JP-A-62-110550

  In the case of the parking lock device using the above helical spring, the helical spring needs to be attached simultaneously with the operation of attaching the parking pole to the housing. Therefore, the assembly workability of the parking lock device is poor, it is difficult to increase the number of production, the manufacturing cost is increased, and it is difficult to reduce the product price.

  Further, the maintenance of the parking pole in the non-engagement position depends on the urging force of the helical spring provided on the swinging central axis of the parking pole. Therefore, if the biasing force of the helical spring is increased so that the parking pole is surely positioned at the non-engagement position, the biasing force of the helical spring is required to swing the parking pole from the non-engagement position to the engagement position. The parking pole must be swung against this, which increases the operating force of the parking lock, which may impair the smooth operation feeling of the operator.

  On the other hand, if the urging force of the helical spring is reduced in order to reduce the operating force of the parking lock, it becomes difficult to reliably place the parking pole in the non-engagement position. There is a possibility that the parking pole swings in the locking direction due to the transmitted vibration and the like, and the parking gear is hit by the engaging claw.

  Further, in the case of the parking lock device using the leaf spring disclosed in Patent Document 1, the pressing force of the leaf spring is released from the locking arm when the P range is selected, and the urging force that urges the locking arm in the separating direction disappears. Only the urging force in the approaching direction by the cam acts on the locking arm. Therefore, the locking arm may vibrate in the swing direction due to engine idling or the like, and noise may be generated due to contact with the parking gear. The leaf spring provided on the push rod moves in the axial direction along with the push rod by the stroke. Therefore, it is necessary to secure an occupied space for the leaf spring to move in the housing, which may increase the size of the entire device and increase the overall weight. Therefore, there are concerns about deterioration in mountability to automobiles and fuel consumption. Moreover, it is difficult to attach the leaf spring to the push rod, and the assembly workability is poor. Further, it is necessary to provide a plurality of movement restricting pins in order to urge the locking arm at the pressing portion of the leaf spring other than when the P range is selected and to release the urging by the pressing portion of the leaf spring when the P range is selected. Becomes complicated.

  The present invention has been made to solve at least one of the above-mentioned problems, and its purpose is to facilitate assembly work and to disengage the parking pole without impairing the smooth operation feeling of the operator. An object of the present invention is to provide a parking lock device for a transmission that can be held in position.

  A parking lock device for a transmission according to a first aspect of the present invention includes a parking gear coupled to a rotation shaft rotatably supported by a housing of the transmission and having a gear groove formed in the outer peripheral surface thereof; A parking pole supported by the housing so as to be swingable in a locking direction approaching the outer peripheral surface and a unlocking direction separating from the outer peripheral surface of the parking gear, and a gear provided by the swinging of the parking pole in the locking direction. An engaging claw that engages with the groove and a non-engaging state in which the engaging pawl and the gear groove are disengaged by urging the parking pawl in the locking direction by moving in a direction perpendicular to the swinging direction of the parking pawl. The cam mechanism swings from the mating position to the engagement position where the engagement claw engages with the gear groove, and has a band plate shape with the base end supported by the housing, and the distal end is And having a biasing means in contact with the king pole urges the parking pole in the unlocking direction.

  According to a second aspect of the present invention, in the parking lock device for a transmission according to the first aspect, the urging means is folded at the first base portion where the base end portion extends in a straight line and at one end of the first base portion. The housing has a substantially L-shape having a second base portion that is bent and extends in a straight line, and the housing has a first slit portion into which the first base portion can be inserted and a second slit into which the second base portion can be inserted. A support part in which the part is cut out, and the base part is supported by the support part by inserting the first base part into the first slit part and inserting the second base part into the second slit part. It is characterized by.

  According to a third aspect of the present invention, in the parking lock device for a transmission according to the first or second aspect, the biasing means is a lever that can be bent and elastically deformed between a base end portion and a tip end portion of the biasing means. And the parking pole is urged in the unlocking direction by a restoring force accompanying the bending elastic deformation of the lever portion.

  According to a fourth aspect of the present invention, in the parking lock device for a transmission according to any one of the first to third aspects, the parking pawl is in contact with the tip of the urging means so that the parking pawl is engaged. A contact surface that guides the tip of the urging means over a swinging position between the contact point and the non-engagement position, and a tip of the urging means that is provided on the contact surface and engages at the non-engagement position. And an urging means for entering.

  According to a fifth aspect of the present invention, in the parking lock device for a transmission according to the fourth aspect, the biasing means has a roller that rolls on the contact surface of the parking pole at the tip.

  According to a sixth aspect of the present invention, in the parking lock device for a transmission according to the fifth aspect, the engaging means includes a concave portion that is recessed in the contact surface and into which a part of the roller is retracted in the non-engagement position. It is characterized by having.

  According to the first aspect of the present invention, the parking lock device of the transmission has a band plate shape in which the base end portion is supported by the housing, and the front end portion abuts on the parking pawl to bias the parking pawl in the unlocking direction. Urging means is provided. Therefore, the work for attaching the biasing means to the housing can be performed separately from the work for attaching the parking pole, and the assembly workability of the parking lock device can be improved as compared with the conventional helical spring. Therefore, the number of production can be increased, the manufacturing cost can be reduced, and the product price can be reduced.

  Further, since the urging means always urges the parking pole in the unlocking direction, the parking pole can be prevented from rattling. Therefore, it is possible to prevent the occurrence of noise due to the hitting of the parking gear by the engaging claw at the engaging position.

  According to the invention of claim 2, the first base portion is inserted into the first slit portion, and the second base portion is inserted into the second slit portion, whereby the base end portion of the biasing means is attached to the support portion of the housing. Can be supported. Therefore, the work for attaching the biasing means to the housing can be facilitated, and the assembly workability of the parking lock device can be improved.

  Further, the base end portion of the urging means is substantially L-shaped by the first base portion and the second base portion, and the support portion of the housing includes the first slit portion and the second base portion corresponding to the first base portion and the second base portion. Since the slit portion is notched, the attachment position of the urging means with respect to the housing can be positioned with high accuracy, and the urging means having a strip shape can be prevented from being displaced in the longitudinal direction. .

  The invention of claim 3 is an example of a specific configuration of the urging means, and according to this, the urging means is a lever that can be bent and elastically deformed between the proximal end portion and the distal end portion of the urging means. Since the parking pole is biased in the unlocking direction by the restoring force accompanying the bending elastic deformation of the lever portion, the structure can be simplified.

  Therefore, if the urging means is easily manufactured, the manufacturing cost can be reduced. In addition, with a simple structure, it is not necessary to secure a large space occupied by the urging means, the entire parking lock device can be reduced in size, and the weight of the entire transmission can be reduced.

  According to the invention of claim 4, since the parking pole is held in the non-engagement position by the holding means, even if the urging means is changed to one having a small urging force, the inertial force such as the lateral G during turning of the vehicle, etc. Therefore, the parking pole can be prevented from swinging in the locking direction from the non-engagement position. Also, by changing the urging force of the urging means to a smaller one, the parking lock operating force can be reduced, and the pole entry force, which is the force with which the engagement pawl of the parking pole enters the gear groove of the parking gear, is improved. Can do.

  In addition, compared with a conventional helical spring, the operating friction for swinging the parking pole from the non-engagement position toward the lock direction can be reduced, and the engagement pawl of the parking pole can be used as the parking gear gear. The engaging force that engages with the groove can be stabilized.

  According to the fifth aspect of the present invention, since the roller that rolls the contact surface of the parking pole is provided at the tip of the urging means, the tip of the urging means is brought into contact with the swing of the parking pole. It can be moved smoothly on the surface. Accordingly, the parking pole that swings between the engagement position and the non-engagement position can always be urged toward the unlocking direction with a predetermined urging force, so that the parking pole can be smoothly oscillated. it can.

  According to the invention of claim 6, when the parking pawl is located at the non-engagement position, the engaging means is configured to immerse a part of the roller into the concave portion of the abutting surface and to displace the tip of the urging means. Can be enrolled. Therefore, the parking pole can be reliably held at the non-engagement position.

  Then, by applying a biasing force that biases the parking pole in the locking direction by the cam mechanism, the roller is pulled out of the recess to release the engagement of the tip and release the parking pole from being held in the non-engagement position. can do.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 is an overall view of the transmission, FIG. 2 is a diagram showing a partial cross-section of FIG. 1 as viewed from the direction A, FIG. 3 is a diagram showing an enlarged main part of FIG. 2, and FIG. FIG. 5 is an enlarged view of the distal end portion of the parking pole, and FIG. 5 is a view in the direction of arrow B in FIG.

  The transmission 1 to which the parking lock device of the present invention is applied is a so-called vertical type automatic transmission that is disposed along the longitudinal direction of the vehicle body at the lower part of the vehicle body. As shown in FIGS. 1 and 3, the rotary shaft 2 is rotatably provided.

  The parking lock device 10 includes a parking gear 11 that is integrally coupled to the rotary shaft 2. The parking gear 11 is spline-fitted to an end portion on the rear portion side of the rotary shaft 2 protruding from the housing rear portion 3B, and a gear groove 11a having a predetermined depth is formed on the outer circumferential surface at equal intervals in the circumferential direction. And is recessed.

  A parking pole 21 is swingably provided at a position facing the outer peripheral surface of the parking gear 11. The configuration of the parking pole 21 will be described below.

  The parking pole 21 extends in a direction perpendicular to the center of rotation of the rotary shaft 2 at the housing rear portion 3B, and swings in a locking direction approaching the outer peripheral surface of the parking gear 11 and in an unlocking direction separating from the outer peripheral surface of the parking gear 11. It is supported movably. In the parking pole 21, the swing center shaft 21 a is supported at a position lower than the rotation center of the rotating shaft 2, extends upward along the outer peripheral surface of the parking gear 11, and the tip 21 b of the rotating shaft 2. It is provided so as to protrude to a height position above the rotation center.

  An engaging claw 22 is projected from the parking pole 21. The engaging claw 22 protrudes from a facing surface 23 of the parking pole 21 facing the outer peripheral surface of the parking gear 11 at a height position substantially the same as the center of rotation of the parking gear 11 by a predetermined amount of protrusion. The rotation of the parking gear 11 is locked by engaging with the gear groove 11a of the parking gear 11 at the engagement position indicated by the dotted line, and radially outward from the outer peripheral surface of the parking gear 11 at the non-engagement position indicated by the solid line in FIG. The parking gear 11 is formed so as to release the rotation lock.

  A contact surface 24 is formed at the tip 21 b of the parking pole 21. The abutting surface 24 abuts on a roller 35 provided at a distal end portion of a return spring 31 to be described later, and abuts while the parking pole 21 swings between the engaging position and the non-engaging position. The roller 35 is rolled and guided on the surface 24. As shown in FIG. 4, the roller 35 is continuously formed on the end portion 21b side of the facing surface 23, and in the swinging direction of the parking pole 21. It has a planar shape that extends in an orthogonal direction and gradually inclines in a direction away from the parking gear 11 as the parking pole 21 moves from the swinging central axis 21a side toward the tip end 21b side. ing.

  A recess 25 is provided in the contact surface 24. The recess 25 constitutes an engaging means in which the tip of the return spring 31 is engaged at the non-engagement position, and is recessed at the end position of the contact surface 24 on the facing surface 23 side. It has an arc shape having a certain curvature and is recessed so as to extend in a direction orthogonal to the swinging direction of the parking pole 21.

  The parking pole 21 having the above configuration is urged toward the unlocking direction by a return spring 31 which is an urging means. Below, the structure of the return spring 31 is demonstrated.

  The return spring 31 has a band plate shape in which the base end portion 32 is supported by the support portion 6 of the housing rear portion 3B, and the distal end portion 33 abuts on the parking pole 21 to attach the parking pole 21 in the unlocking direction. It is a force.

  The base end portion 32 of the return spring 31 has a substantially L shape having a first base portion 32a that extends in a straight line and a second base portion 32b that is bent at one end of the first base portion 32a and extends in a straight line shape. The first base portion 32a is notched at a predetermined depth along the direction orthogonal to the swinging direction of the parking pole 21 from the mounting surface portion 5 of the housing rear portion 3B, and extends along the outer peripheral surface of the parking gear 11. The second base portion 32b is notched at a predetermined depth in the mounting surface portion 5 of the housing rear portion 3B, and is inserted substantially into the first slit portion 6a. It is attached and supported by being inserted into the second slit portion 6b of the support portion 6 extending at an angle of 90 °.

  As described above, the return spring 31 includes the first base portion 32a and the second base portion 32b having the substantially L-shaped base end portion 32, and the first slit portion 6a and the second slit portion of the support portion 6 from the rear of the housing rear portion 3B. Since it can be attached to the housing rear portion 3B by being respectively inserted into 6b, the attaching work of the return spring 31 to the housing can be easily performed, and as a result, the assembling workability of the parking lock device 10 can be improved. it can.

  In addition, the return spring 31 has a base end portion 32 that is substantially L-shaped by a first base portion 32a and a second base portion 32b, and the first base portion 32a and the second base portion 32b are inserted into the support portion 6 of the housing rear portion 3B. Since the first slit portion 6a and the second slit portion 6b that can be attached are notched, the attachment position of the return spring 31 to the housing 3 can be positioned with high accuracy, and the belt-like plate member can be bent. It is possible to prevent the formed return spring 31 from being displaced in the direction perpendicular to the rotation axis 2 including the longitudinal direction thereof.

  The return spring 31 has a lever portion 34 between the proximal end portion 32 and the distal end portion 33. The lever portion 34 extends continuously to one end of the second base portion 32 b, and has a length such that the distal end portion 33 abuts against the abutment surface 24 of the parking pole 21. The distal end portion 33 can be bent and elastically deformed in a direction away from the contact surface 24 along the swinging direction of the parking pole 21, and the parking pole 21 is attached in the unlocking direction by the restoring force accompanying the bending elastic deformation. It is configured to force.

  The tip 33 of the return spring 31 is provided with a roller 35 that abuts on the abutment surface 24 and can roll on the abutment surface 24 in response to the swing of the parking pole 21. In this embodiment, a part of the roller 35 is formed in a cylindrical shape having an outer diameter that can be inserted into the concave portion 25 of the contact surface 24 and can be engaged therewith, and is rotatably supported at the tip of the lever portion 34. Has been.

  When the parking pole 21 is in the non-engagement position, the roller 35 is partially engaged with the concave portion 25 of the abutment surface 24, while the parking pole 21 is disengaged by a cam mechanism 51 described later. By being urged toward the locking direction from the mating position, it comes out of the recessed portion 25 to release the engagement to the recessed portion 25, and further rolls on the contact surface 24 in accordance with the movement of the parking pole 21 in the locking direction. On the other hand, the parking pole 21 is configured to be urged in the unlocking direction by pressing the contact surface 24 by the restoring force accompanying the bending elastic deformation of the lever portion 34. Therefore, the initial swing force that swings the parking pole 21 from the non-engagement position toward the lock direction is increased more than the swing force that swings toward the lock direction on the engagement position side of the non-engagement position. .

  A parking support 41 is attached to the attachment surface portion 5 of the housing rear portion 3B. The configuration of the parking support 41 will be described below.

  The parking support 41 interposes the slide cam 52 of the cam mechanism 51 between the parking pole 21 and moves the interposed slide cam 52 in a direction substantially perpendicular to the swinging direction of the parking pole 21. The parking pawl 21 is urged toward the locking direction, and the engaging pawl 22 is moved from the disengaged position where the engaging pawl 22 of the parking pawl 21 and the gear groove 11a of the parking gear 11 are disengaged. It is comprised so that it may rock | fluctuate to the engagement position engaged with 11a.

  The parking support 41 has a plate shape having a predetermined thickness extending along the mounting surface portion 5 of the housing rear portion 3B, and is fixed to mounting holes 42 and 43 drilled at both ends of the parking support 41. The bolts 44 and 45 are inserted and screwed into the bolt holes 5a and 5b of the housing rear portion 3B to be fixed to the mounting surface portion 5. In the figure, reference numeral 47 denotes a knock pin that positions the parking support 41 with respect to the mounting surface portion 5.

  A protrusion 46 is provided at one end of the parking support 41. The protrusion 46 extends along the attachment surface portion 5 by fixing the parking support 41 to the housing rear portion 3B, closes the opening portion of the first slit portion 6a that opens to the attachment surface portion 5, and the first base portion 32a. Is prevented from coming out of the opening of the first slit portion 6a, and the return spring 31 is positioned in a direction perpendicular to the swinging direction of the parking pole 21.

  Reference numeral 61 in FIG. 2 denotes a parking rod. The parking rod 61 is provided so as to extend in the front-rear direction of the housing 3 at the housing lower portion 3C, and the base end portion 61a of the parking rod 61 is swingable in the front-rear direction on the housing front portion 3A side. It is connected to a supported manual plate 62.

  The manual plate 62 is attached to and supported by one end of a shaft 63 that extends in the vehicle width direction and is rotatably supported by the housing front portion 3A. A lock arm 64 is attached to the other end of the shaft 63, and the tip of the lock arm 64 is connected to an AT select lever (not shown).

  Then, by selecting the P range from a position other than the P range by operating the AT select lever, the lock arm 64 is swung, and the parking rod 61 is moved in front of the housing by the manual plate 62 that swings in conjunction with the lock arm 64. The parking rod 61 is moved from the housing rear part 3B side to the housing front part by moving from the non-parking position to the parking position and selecting a position other than the P range from the P range. It is configured to move from the parking position to the non-parking position by moving toward the 3A side.

  The front end 61 b of the parking rod 61 passes between the parking support 41 and the parking pole 21 and protrudes rearward from the parking support 41 and the parking pole 21. A slide cam 52 is provided at a location interposed therebetween.

  The slide cam 52 has a cylindrical shape into which the front end portion 61b of the parking rod 61 can be fitted. The small diameter portion 52a is disposed on the housing rear portion 3B side, and the large diameter portion 52b is disposed on the housing front portion 3A side. In the state, it is inserted along the parking rod 61 so as to be movable.

  The small-diameter portion 52 a has a cylindrical shape having a constant diameter and extending in the axial direction, and is sandwiched between the parking support 41 and the parking pole 21, whereby the engaging claw 22 of the parking pole 21. Is formed in such a size that the parking pole 21 is arranged at a non-engagement position located radially outside the outer peripheral surface of the parking gear 11.

  The large-diameter portion 52b has a tapered inclined surface that gradually increases in diameter as it moves away from the small-diameter portion 52a in the axial direction, and is sandwiched between the parking support 41 and the parking pole 21. When the parking pawl 21 is moved in the diameter increasing direction, the parking pawl 21 is moved away from the parking support 41 in the locking direction so as to approach the parking gear 11, and the engaging pawl 22 of the parking pawl 21 is moved in the parking lock position. Can be engaged with the gear groove 11 a of the parking gear 11.

  The slide cam 52 having the above-described configuration is inserted into the distal end portion 61 b of the parking rod 61 so as to be movable in the axial direction, and is urged toward the distal end side of the parking rod 61 by a spring 53. The spring 53 is externally fitted to the parking rod 61 on the housing front portion 3 </ b> A side with respect to the slide cam 52, and one end is supported by a spring receiver 65 provided on the parking rod 61.

  In the parking lock device 10 having the above configuration, when a position other than the P range is selected by the operation of the AT select lever, the parking rod 61 is disposed at the non-parking position, and the parking support 41 and the parking pole 21 are A small diameter portion 52a of the slide cam 52 is interposed therebetween.

  Accordingly, the parking pole 21 is urged in the unlocking direction by the urging force of the return spring 31 and is swung to the non-engagement position, and a part of the roller 35 of the return spring 31 is immersed in the recess 25 of the contact surface 24. And is held in the disengaged position. In the non-engagement position, the engagement claw 22 is brought into a non-engagement state in which the engagement claw 22 is separated from the outer peripheral surface of the parking gear 11 to the radially outer position, and the rotation of the rotary shaft 2 is allowed.

  On the other hand, when the P range is selected from a range other than the P range by operating the AT select lever, the parking rod 61 is moved from the non-parking position to the parking position, and a large diameter is provided between the parking support 41 and the parking pole 21. The slide cam 52 is moved in the direction in which the portion 52b is interposed.

  When the slide cam 52 moves, the large-diameter portion 52b of the slide cam 52 is interposed between the parking support 41 and the parking pole 21, and the parking pole 21 is urged toward the locking direction from the disengaged position. Then, the roller 35 comes out of the recess 25 and the engagement with the recess 25 is released (for example, shown by a two-dot chain line in FIG. 4), and the roller 35 moves on the contact surface 24 according to the swinging of the parking pole 21 in the lock direction. 35 rolls. As a result, the parking pole 21 is swung in the locking direction against the urging force in the unlocking direction by the return spring 31.

  Here, when the position of the gear groove 11a of the parking gear 11 coincides with the position of the engaging claw 22 of the parking pawl 21, the parking pawl 21 is swung in the locking direction as it is to the engagement completion position. The engaging claw 22 is moved into the engaged state where the engaging claw 22 is completely engaged with the gear groove 11a of the parking gear 11, and the rotation of the rotating shaft 2 is locked.

  Further, when the position of the gear groove 11a of the parking gear 11 does not coincide with the position of the engaging claw 22 of the parking pole 21, the engagement standby position where the engaging claw 22 is pressed against the outer peripheral surface of the parking gear 11 is set. The gap is not formed so that the large diameter portion 52b is completely interposed between the parking support 41 and the parking pole 21. Accordingly, the slide cam 52 moves toward the housing front portion 3A side of the parking rod 61 while pressing and contracting the spring 53, and biases the parking pole 21 in the locking direction by the biasing force of the spring 53, thereby engaging the parking pawl 21 with an engaging claw. A so-called parking waiting state in which 22 is pressed against the outer peripheral surface of the parking gear 11 can be achieved. Accordingly, in this state, for example, when the rotary shaft 2 is slightly rotated and the position of the gear groove 11a of the parking gear 11 and the position of the engaging claw 22 of the parking pole 21 coincide with each other, the slide cam 52 causes the parking pole 21 to move. Is swung in a direction away from the parking support 41 to move from the engagement standby position to the engagement completion position, and the engagement claw 22 is brought into the engagement state in which the gear claw 11a of the parking gear 11 is completely engaged. The rotation of the rotating shaft 2 is locked.

  When a range other than the P range is selected from the P range by the operation of the AT select lever, the parking rod 61 is moved from the parking position to the non-parking position, and a small diameter portion is provided between the parking support 41 and the parking pole 21. The slide cam 52 is moved in the direction in which 52a is interposed.

  When the slide cam 52 moves and the small-diameter portion 52 a of the slide cam 52 is interposed between the parking support 41 and the parking pole 21, the parking pole 21 is moved to the engagement completion position or engaged by the urging force of the return spring 31. It swings from the standby position toward the unlocking direction.

  The roller 35 rolls on the contact surface 24 in response to the swinging of the parking pole 21 in the unlocking direction, and fits into the recess 25 from the contact surface 24 when the parking pole 21 reaches the non-engagement position. And a part thereof is immersed in the recess 25 (for example, shown by a solid line in FIG. 4). As a result, the parking pole 21 is held at the non-engagement position, the engagement between the engagement claw 22 and the gear groove 11a is released, and the rotation of the rotary shaft 2 is allowed.

  According to the parking lock device 10 having the above configuration, the return spring 31 is inserted into the first slit portion 6a and the second slit portion 6b of the support portion 6 by inserting the first base portion 32a and the second base portion 32b of the return spring 31 into the return spring 31. Since 31 can be attached to the attachment surface portion 4 of the housing rear portion 3B, the attachment work of the return spring 31 can be facilitated. In particular, the attachment work of the return spring 31 to the housing rear portion 3B can be performed separately from the attachment work of the parking pole 21. Therefore, the assembling workability of the parking lock device can be improved as compared with the conventional helical spring. Therefore, the number of production can be increased, the manufacturing cost can be reduced, and the product price can be reduced.

  The first base portion 32a and the second base portion 32b of the return spring 31 are substantially L-shaped, and are inserted into the first slit portion 6a and the second slit portion 6b of the support portion 6 formed in the housing rear portion 3B. As a result, the return spring 31 is attached to the housing 3 with high accuracy, and the return spring 31 formed by bending the belt-shaped plate member has its longitudinal direction. Including the displacement in the direction perpendicular to the rotation axis 2 can be prevented.

  Further, the parking support 41 is fixed to the housing rear portion 3B in a state where the first base portion 32a and the second base portion 32b of the return spring 31 are inserted and attached to the first slit portion 6a and the second slit portion 6b of the attachment surface portion 4. Accordingly, the projection 46 of the parking support 41 can close the opening of the first slit portion 6a. Therefore, the first base portion 32a is prevented from coming out of the opening of the first slit portion 6a, and the parking pole 21 is swung. The return spring 31 can be positioned in the same direction as the axial direction of the moving center shaft 21a.

  Therefore, the return spring 31 can be positioned easily and with high accuracy, and the assembly work of the parking lock device 10 can be facilitated. The first slit portion 6a and the second slit portion 6b of the support portion 6 can be formed by processing from the rear side of the housing rear portion 3B, and the support portion 6 can be easily provided on the mounting surface portion 4. .

  Further, according to the parking lock device 10 having the above configuration, when a range other than the P range is selected by the operation of the AT select lever, the parking pole 21 is positioned at the non-engagement position, and the return spring 31 Since a part of the roller 35 is inserted into the concave portion 25 of the contact surface 24 and engaged therewith, the parking pole 21 can be reliably held at the non-engagement position. Therefore, for example, the parking pole 21 can be prevented from swinging from the disengaged position toward the lock direction due to inertial force such as lateral G when the vehicle is turning.

  Therefore, it is possible to change the return spring 31 to have a small urging force. As a result, the operating force of the parking lock device 10 can be reduced, and the engagement pawl 22 of the parking pole 21 is connected to the gear groove 11a of the parking gear 11. It is possible to improve the power to enter the pole, which is the power to enter.

  Further, as compared with a conventional helical spring, the operating friction for swinging the parking pole 21 from the non-engagement position toward the lock direction can be reduced, and the engagement pawl 22 of the parking pole 21 can be parked. The engaging force that engages with the gear groove 11a of the gear 11 can be stabilized.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the return spring 31 has been described as an example in which the restoring force due to the bending elastic deformation of the lever portion 34 is an urging force. However, the base end portion 32 and the lever portion 34 are pin-coupled. The lever portion 34 is swingably supported by the housing rear portion 3B, and the lever portion 34 is urged by a separately provided urging means so that the distal end portion 33 is brought into contact with the contact surface 24 of the parking pole 21. The parking pole 21 may be urged toward the unlocking direction.

1 is an overall view of a transmission. It is a figure which shows FIG. 1 by the partial cross section which looked at from the A direction. It is a figure which expands and shows the principal part of FIG. It is a figure which expands and shows the front-end | tip part of a parking pole. It is a B direction arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic transmission 2 Rotating shaft 3 Housing 3B Housing rear part 5 Mounting surface part 6 Support part 6a 1st slit part 6b 2nd slit part 10 Parking lock apparatus 11 Parking gear 11a Gear groove 21 Parking pole 22 Engagement claw 25 Recessed part (holding means) )
31 Return spring (biasing means)
32 base end portion 32a first base portion 32b second base portion 33 front end portion 34 lever portion 35 roller 51 cam mechanism 52 slide cam

Claims (6)

A parking gear coupled to a rotary shaft rotatably supported by the transmission housing and having a gear groove formed in the outer peripheral surface;
A parking pole supported by the housing so as to be swingable in a locking direction approaching the outer peripheral surface of the parking gear and in an unlocking direction separating from the outer peripheral surface of the parking gear;
An engaging claw provided on the parking pole and engaged with the gear groove by swinging the parking pole in the locking direction;
By moving the parking pole in a direction perpendicular to the swinging direction of the parking pole, the parking pole is urged in the locking direction, and the engagement claw and the gear groove are disengaged from the disengaged position. A cam mechanism that swings to a position where the pawl engages with the gear groove;
It has a strip shape in which a base end portion is supported by the housing, and has a biasing means for biasing the parking pole in the unlocking direction with a distal end abutting the parking pole. Parking lock device for transmission. The biasing means has a substantially L shape having a first base portion in which the base end portion extends in a straight line and a second base portion which is bent at one end of the first base portion and extends in a straight line shape. Have
The housing has a support part in which a first slit part into which the first base part can be inserted and a second slit part into which the second base part can be inserted are cut out.
2. The base end portion is supported by the support portion by inserting the first base portion into the first slit portion and inserting the second base portion into the second slit portion. A parking lock device for a transmission as described in 1.   The biasing means has a lever portion that can be bent elastically deformed between a base end portion and a tip end portion of the biasing means, and the parking pole is unlocked by a restoring force accompanying the bending elastic deformation of the lever portion. The parking lock device for a transmission according to claim 1, wherein the parking lock device is biased in a direction. The parking pole
An abutting surface that abuts the tip of the biasing means and guides the tip of the biasing means while the parking pole swings between the engagement position and the non-engagement position; ,
The transmission according to any one of claims 1 to 3, further comprising engagement means provided on the contact surface and engaged with a front end portion of the urging means at the non-engagement position. Parking lock device.   The parking lock device for a transmission according to claim 4, wherein a tip portion of the urging means has a roller that rolls on a contact surface of the parking pole. 6. The parking lock device for a transmission according to claim 5, wherein the engaging means has a recess that is recessed in the abutting surface and into which a part of the roller is retracted in the non-engagement position.

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