JP4395486B2 - Automatic transmission parking structure - Google Patents

Description

  The present invention relates to a parking structure for an automatic transmission.

  The automatic transmission is provided with a parking structure that mechanically locks the output shaft of the transmission and prevents the vehicle from moving when the driver operates the select lever to the P range (stop position). .

  FIG. 5 shows a parking structure disclosed in Patent Document 1. When the driver operates the select lever to the P range, the lever 51 rotates to an angular position corresponding to the P range, and a base end portion 64 is rotatably connected to the parking lever 53 via the support hole 52. The joint portion 54 that is slidably supported moves in the right direction in the figure together with the parking rod 53 while being pressed against the joint receiving portion 65 by the rod spring 56.

  At this time, the cam portion 57 formed at the distal end portion of the parking rod 53 comes into contact with the inclined surface 59 formed inside the fixed shaft 58, and the enlarged diameter portion 60 sinks below the base end of the parking pole 61 and parks. Lift the proximal end of the pole 61. As a result, the parking pole 61 swings in the engagement direction (counterclockwise in the figure), and the locking claw 62 formed at the lower end of the parking pole 61 is fixed to the parking gear 63 fixed to the output shaft of the transmission. Engage with the tooth gap and lock the output shaft so that it cannot rotate (parking lock)

  If the locking claw 62 collides with the teeth of the parking gear 63 and cannot be engaged, the parking pole 61 is returned in the release direction (clockwise in the figure) and the parking rod 53 is pushed back in the release direction (left direction in the figure). The rod spring 56 is compressed. The urging force of the rod spring 56 urges the parking pole 61 in the engaging direction via the parking rod 53, whereby the parking pole 61 waits in a state where the locking claw 62 is pressed against the teeth of the parking gear 63. (Waiting action).

After that, when the vehicle moves slightly and the tooth groove of the parking gear 63 rotates to the position corresponding to the locking claw 62, the parking pole 61 swings again in the engaging direction, and the locking claw 62 engages with the tooth groove. Parking lock is performed.
JP 2001-30883 A

  According to the above configuration, when the parking lock is performed, the tip of the parking rod 53 rides on the inclined surface 59 of the fixed shaft 58, so that the entire parking rod 53 is inclined. For this reason, the base end portion 64 of the joint portion 54 is supported to be tiltable with respect to the lever 51 in order to cope with this inclination.

  However, if the degree of freedom of the inclination angle of the joint portion 54 is increased in order to prevent the joint portion 54 from being damaged, when the select lever is operated to the P range while the vehicle is moving at the time of parking or on a slope. There is a problem that the parking lock becomes difficult and the vehicle speed at which the parking lock is performed becomes lower than the design value.

This is because when the latching pawl 62 of the parking pole 53 hits the teeth of the parking gear 63 and is returned, and the parking rod 53 is pushed back in the releasing direction, as shown in FIG. joint portion 54 is tilted rotational moment M around the engagement portion P _a of the lever 51 to the joint portion 54 is generated, the open end P _B of the support hole 52, the parking rod 53 is in contact with the P _C This is thought to be due to the fact that a twist occurs and the frictional force increases. When the frictional force is increased, the movement of the parking rod 53 in the axial direction becomes dull and it becomes difficult for the locking claw 62 to engage with the parking gear 63.

  The present invention has been made in view of such technical problems, and prevents the vehicle speed at which the parking lock is performed from being lowered even when the joint portion is tilted by the urging force of the rod spring. With the goal.

A parking structure for an automatic transmission according to the present invention includes a parking rod that makes a distal end contact with a lower surface of a base end of a parking pole and swings in an engaging direction, a manual plate that rotates in response to a select lever position, The parking rod is supported to be slidable in the axial direction through the support hole and is supported to be tiltable on the manual plate, a joint receiving portion formed in the axial direction of the parking rod, and a parking rod It is interposed between the base end and the rod base end side end surface of the joint, and presses the joint against the joint receiving part. When the parking rod is displaced in the axial direction in response to the input from the parking pole, the joint is compressed. A rod spring that allows relative displacement in the axial direction of the parking rod with respect to the portion. And the inclined surface which inclines toward the radial direction outer side is formed in the opening end by the side of the rod tip of a support hole. Further, the inclined surface is formed so that the inclined surface and the outer peripheral surface of the parking rod are substantially parallel when the joint portion is tilted to the rod tip side by the urging force of the rod spring.

  According to the present invention, by forming the inclined surface inclined toward the radially outer side at the opening end on the rod front end side of the support hole, the support hole is supported even if the joint portion is tilted due to the urging force of the rod spring. It is possible to prevent the parking rod from being twisted at the opening end of the parking rod, and to ensure a good movement of the parking rod in the axial direction.

  Accordingly, the vehicle speed at which the parking lock is performed is prevented from being lower than the design value, and the moving distance of the vehicle until the parking lock is performed can be shortened to improve the safety of the vehicle.

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

  1 to 3 show a parking structure according to the present invention. FIG. 1 is a partial sectional view of a portion where the parking structure is provided, FIG. 2 is a sectional view taken along line XX of FIG. It is YY sectional drawing of FIG.

  The parking structure includes a parking gear 2 that is fixed to the output shaft 1 of the transmission, a parking pole 4 that has an engaging claw 3 that engages with the parking gear 2, a parking rod 5 that extends in a direction substantially orthogonal to the parking pole 4, A joint portion 6 that is fitted onto the parking rod 5 and a manual plate 7 that supports the joint portion 6 so as to tilt and rotate are provided. In the figure, 8 is an input shaft of the transmission, and an output shaft of the engine is connected via a torque converter (not shown).

  The parking pole 4 is swingably supported by a support shaft 9 extending substantially parallel to the output shaft 1 at a position separated from the output shaft 1, and a torsion spring 10 is wound around the outer periphery of the support shaft 9. In a compressed state, the torsion spring 10 has one end locked to the inner wall of the recess 11 formed in the transmission case, and the other end locked to the upper edge of the parking pole 4. 4 is urged in the release direction (clockwise direction in FIG. 1).

  A substantially rectangular locking claw 3 extending toward the parking gear 2 is formed on the lower surface of the front end of the parking pole 4. When the parking pole 4 swings in the engaging direction (counterclockwise direction in FIG. 1) against the urging force of the torsion spring 10, and the engaging claw 3 engages with the tooth groove of the parking gear 2, the output shaft 1 is mechanically locked (parking lock).

  Further, a support member 12 having a support concave surface in the center facing the lower surface of the base end is fixed to the transmission case below the base end of the parking pole 4. A parking rod 5 is disposed between the bottom surface of the base end of the parking pole 4 and the concave support surface of the support member 12 with the tip portion inserted.

  As shown in FIGS. 2 and 3, a cam portion 13 having a diameter gradually increasing from a position adjacent to the support member 12 toward the rod distal end side is formed at the distal end portion of the parking rod 5. Is formed with an enlarged diameter portion 14 having a diameter larger than the diameter of the center of the rod. The cam portion 13 functions as a cam surface that lifts the base end of the parking pole 4 by contacting the bottom surface of the parking pole 4 and the support concave surface of the support member 12 when performing parking lock. It functions as a support member that supports the base end of the pole 4.

  On the other hand, a sliding shaft portion 15 having a diameter smaller than the diameter of the center of the rod is provided on the proximal end side of the parking rod 5, and the parking rod 5 serves as a support hole for the joint portion 6. 16 is supported so as to be slidable in the axial direction.

  As shown in FIG. 4, the opening end of the support hole 16 on the rod front end side is inclined toward the radially outer side of the support hole 16 and is inclined at a predetermined inclination angle θ with respect to the center line of the support hole 16. An inclined surface 18 is formed. More specifically, when the joint portion 6 is tilted by the biasing force of the rod spring 21 and enters the state shown in FIG. It is formed so as to be substantially parallel to the outer periphery and in line contact with the outer periphery of the parking rod. Furthermore, the surface roughness (surface roughness) of the inclined surface 18 is a value smaller than the surface roughness of other portions (the constant diameter portion 17 on the rod base end side) of the inner peripheral surface of the support hole 16, that is, It is set to be smoother.

  A rod spring 21 is interposed in a compressed state between an end surface of the joint base 6 on the rod base end side and a spring presser 20 fixed to the base end of the parking rod 5. The urging force of the spring 21 is pressed against the joint receiving portion 30 formed in the middle of the parking rod 5 in the axial direction. Here, the joint portion 30 is formed by forming a step portion in the middle of the parking rod 5 in the axial direction using the difference between the diameter of the center of the rod and the diameter of the sliding shaft portion 15. You may form by fixing an annular receiving member to the outer periphery of this by crimping etc.

  The base portion 23 extending downward from the joint portion 6 is supported so as to be tiltable and rotatable with respect to the manual plate 7. A locking member 24 is fixed to the lower end of the base portion 23 so that the joint portion 6 does not come out of the manual plate 7.

  As shown in FIG. 2, the manual plate 7 is fixed to a rotating shaft 25 that rotates in response to a driver's select lever operation. When the rotary shaft 25 rotates in response to the driver's operation of the select lever, the manual plate 7 rotates to an angular position corresponding to the position of the select lever (ranges L, D, N, R, and P). A plurality of valleys 26 are formed on the outer edge of the manual plate 7 corresponding to the position of the select lever, and when the holding pins 28 urged by the detent plate 27 are fitted into the valleys 26, the manual plate 7 is It is held at an angular position corresponding to the position of the select lever.

  Next, the operation of the parking structure will be described.

  When the driver operates the select lever from a range other than the P range to the P range, the manual plate 7 rotates clockwise in FIG. 2 about the rotation shaft 25 and is moved to an angular position corresponding to the P range by the detent plate 27. Retained. At this time, the joint portion 6 moves upward in FIG. 2 together with the parking rod 5 while being pressed against the joint receiving portion 30.

  As a result, the cam portion 13 provided at the distal end of the parking rod 5 enters between the lower surface on the proximal end side of the parking pole 4 and the support concave surface of the support member 12 and lifts the proximal end of the parking pole 4. The parking pole 4 swings in the engaging direction (counterclockwise in FIG. 1) against the urging force of the torsion spring 10, and engages the locking claw 3 formed at the tip with the tooth groove of the parking gear 2. The output shaft 1 is locked so as not to rotate. When the locking claw 3 hits the teeth of the parking gear 2 and cannot be engaged, the parking pole 4 is returned in the releasing direction (clockwise in FIG. 1) and waits until it can be engaged (waiting operation). .

  In this waiting operation, in response to an input from the parking pole 4, the parking rod 5 is pushed back in the releasing direction (downward in the drawing in FIG. 2, leftward in the drawing in FIG. 3). The rod spring 21 is compressed away from. The biasing force of the rod spring 21 at this time biases the parking pole 4 in the engaging direction via the parking rod 5, and the parking pole 4 waits in a state where the engaging pawl 3 is pressed against the teeth of the parking gear 2. To do.

If the urging force of the rod spring 21 acts on the rod base end side end surface of the joint portion 6 in a state where the joint portion 6 is separated from the joint receiving portion 30, the engagement with the manual plate 7 is applied to the joint portion 6 as shown in FIG. 4. A rotational moment M around the joint P ₁ is generated, and the joint 6 tilts toward the rod tip side. However, as described above, the inclined surface 18 is formed at the opening end on the rod front end side of the support hole 16 of the joint portion 6, and when the joint portion 6 is inclined due to the urging force of the rod spring 21. Since the inclined surface 18 is substantially parallel to the outer periphery of the parking rod 5 and the inclined surface 18 is smoother than the other parts, no twisting occurs between the parking rod 5 and the opening on the rod tip side. The frictional force decreases. Thus, although the embodiment of the contact at the open end P ₂ of the rod base end side is not the same as the prior art, it decreases the overall frictional force acting on the parking rod 5, ensure the movement of the good axial parking rod 5 can do.

  Therefore, after that, if the vehicle moves and the output shaft 1 rotates and the tooth gap of the parking gear 2 rotates to a position corresponding to the locking claw 3 of the parking pole 4, the parking rod 5 quickly moves in the engaging direction. The parking rod 4 is moved again to swing in the engaging direction, and the parking pawl 4 is engaged with the tooth gap of the parking gear 2 to engage the parking rod.

  As described above, according to the present invention, even when the degree of freedom of the inclination angle of the joint portion 6 is increased, it is possible to avoid that the vehicle speed to be parked locked is lower than the design value. Thus, the parking lock can be performed even when the driver operates the select lever to the P range while the vehicle is moving. That is, according to the present invention, the distance that the vehicle moves from when the driver operates the select lever to the P range until the parking lock is completed is reduced, and the safety of the vehicle can be improved.

  As mentioned above, although embodiment of this invention was described, the said embodiment only showed an example of the structure to which this invention was applied, and is not the meaning which limits the application range of this invention to the said structure. The above configuration can be modified without departing from the gist of the present invention, and these modified examples are of course included in the technical scope of the present invention.

  For example, although the parking structure shown here is used for a belt-type continuously variable transmission, it is used for an automatic transmission of another configuration such as a stepped automatic transmission using a planetary gear or a toroidal continuously variable transmission. This is also applicable.

  Further, in the above configuration, the inclined surface 18 is formed over the entire opening end on the rod tip side, but the inclined surface 18 is close to the parking rod 5 and the inner peripheral surface of the support hole when at least the joint portion 6 is inclined. It is only necessary to be provided at the site, and a configuration in which such an inclined surface 18 is partially formed at the opening end on the rod tip side is also included in the technical scope of the present invention.

It is a fragmentary sectional view of an automatic transmission provided with the parking structure concerning the present invention. It is sectional drawing which shows the XX cross section of FIG. It is sectional drawing which shows the YY cross section of FIG. It is a schematic block diagram for demonstrating the structure of a joint part. It is the schematic which shows the conventional parking structure. It is a schematic block diagram for demonstrating the structure of the joint part of the conventional parking structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Output shaft 2 Parking gear 3 Locking claw 4 Parking pole 5 Parking rod 6 Joint part 7 Manual plate 8 Input shaft 9 Support shaft 10 Torsion spring 12 Support member 13 Cam part 14 Expanded part 15 Slide shaft part 16 Support hole 18 Inclined surface 20 Spring retainer 21 Rod spring 25 Rotating shaft 27 Detent plate 30 Joint receiving part

Claims (2)

A parking gear fixed to the output shaft of the automatic transmission;
A parking pawl having an engaging claw that engages with the parking gear at the tip, and supported swingably on a support shaft that is disposed apart from the output shaft;
A support member disposed to face the lower surface of the base end of the parking pole;
The distal end portion is disposed between the lower surface of the proximal end of the parking pole and the support member, and the distal end portion comes into contact with the lower surface of the proximal end of the parking pole and the support member when displaced in the axial direction. A parking rod that lifts the base end of the parking pole;
A manual plate that rotates according to the position of the select lever;
A joint portion that supports the parking rod so as to be slidable in the axial direction through a support hole and is supported to be tiltable to the manual plate;
A joint receiving part formed in the axial direction of the parking rod;
The parking rod is interposed between a base end portion of the parking rod and a rod base end side end surface of the joint portion and presses the joint portion against the joint receiving portion, and the parking rod receives an input from the parking pole and receives a shaft. A rod spring that is compressed when displaced in the direction to allow relative displacement in the axial direction of the parking rod with respect to the joint portion;
An inclined surface inclined toward the radially outer side is formed at the opening end of the support hole on the rod tip side, and the inclined surface is inclined when the joint portion is tilted toward the rod tip side by the biasing force of the rod spring. A parking structure for a transmission, wherein the inclined surface and the outer peripheral surface of the parking rod are formed substantially parallel to each other . The parking structure for a transmission according to claim 1 , wherein the inclined surface is made smoother than other portions of the inner peripheral surface of the support hole.

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