JP7219067B2 - parking lock mechanism - Google Patents

Description

The present invention relates to a vehicle parking lock mechanism.

2. Description of the Related Art Vehicles such as automobiles are equipped with a transmission unit that shifts torque generated by a drive source such as an engine. The concept of a transmission unit includes not only a single transmission but also a transaxle that integrally includes a transmission and a differential gear.

JP 2013-209090 A

FIG. 3 is a side view showing part of the transmission unit 101 previously created by the applicant.

The transmission unit 101 is provided with a parking lock mechanism 103 that locks the output shaft 102 of the transmission when the shift lever (select lever) is at the P (parking) position.

Parking lock mechanism 103 includes parking gear 104 , parking pole 105 and parking rod 106 .

Parking gear 104 is provided so as not to rotate relative to output shaft 102 .

The parking pole 105 extends in the front-rear direction above the parking gear 104 . A base end portion of the parking pole 105 is rotatably supported by a unit case 108 forming an outer shell of the transmission unit 101 via a pole rotating shaft 107 extending in the left-right direction. A meshing portion 109 that protrudes toward the parking gear 104 is formed in an intermediate portion of the parking pole 105 . The parking pole 105 is urged by two return springs 110 and 111 in a direction in which the meshing portion 109 is separated from the parking gear 104 .

Parking rod 106 extends in the front-rear direction, and its tip faces the tip of parking pole 105 in the front-rear direction. A cam 112 is slidably provided on the parking rod 106 .

When a shift lever (select lever) provided in the passenger compartment of the vehicle is operated and the shift lever is operated from a position other than the P (parking) position to the P position, the shift operation force due to the operation is applied to the parking rod 106. As a result, the parking rod 106 advances toward the parking pole 105 . As parking rod 106 advances, cam 112 comes into contact with the tip of parking pole 105. When parking rod 106 advances further, cam 112 pushes the tip of parking pole 105 against the biasing force of return springs 110 and 111. is pushed down. As a result, the meshing portion 109 of the parking pole 105 fits into the tooth groove 116 of the parking gear 104, and the rotation of the parking gear 104 is restricted (parking lock).

When the shift lever is operated from the P position to a position other than the P position, the shift operation force due to that operation is transmitted to parking rod 106 , and parking rod 106 retreats from parking pole 105 . As the parking pole 105 is retracted, the biasing force of the return springs 110 and 111 causes the parking pole 105 to rotate about the pole rotating shaft 107 so that the tip of the parking pole 105 is lifted. As a result, the meshing portion 109 of the parking pole 105 is disengaged from the tooth groove 116 of the parking gear 104, and the rotation of the parking gear 104 is permitted (the parking lock is released).

A parking support 113 is provided above the parking pole 105 and the parking rod 106 so as to extend over them. The parking support 113 can prevent the cam 112 from escaping upward when the parking rod 106 advances and retreats. Parking support 113 also functions as a detent for parking pole 105 when meshing portion 109 of parking pole 105 is disengaged from tooth groove 116 of parking gear 104 .

Since the parking rod 106 enters between the parking pole 105 and the parking support 113, the parking support 113 must be positioned above the parking pole 105 and above the parking rod 106. I don't get it. Therefore, a part of the unit case 108 must bulge upward in order to secure a place for the parking support 113, which causes the problem that the transmission unit 101 becomes large and heavy. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a parking lock mechanism capable of reducing the size and weight of a transmission unit.

In order to achieve the above object, a parking lock mechanism according to the present invention is a parking lock mechanism housed in a unit case of a transmission unit, the parking lock mechanism comprising: a parking gear provided rotatably about a predetermined rotation axis; a parking pole provided swingably around a pole rotation axis parallel to the rotation axis, and having a meshing portion that engages and disengages with the tooth groove of the parking gear by the rocking; A return spring that biases in a direction of disengagement from the groove, and a return spring that is provided so as to be able to advance and retreat with respect to the parking pole, and advances toward the parking pole from a state in which the meshing portion is disengaged from the tooth groove, and attaches to one end of the parking pole. a parking rod that abuts and displaces the parking pole in a direction in which the meshing portion engages with the tooth groove of the parking gear; and a parking support provided to enter between and rub against the portion, the parking pole enters between the parking gear and the parking support and extends along the outer periphery of the parking gear, and one end portion is positioned on the upstream side in the separating direction with respect to the most downstream portion of the parking gear in the separating direction.

According to this configuration, the parking rod is brought into contact with the parking pole by advancing the parking rod toward the parking pole, and the parking rod engages the parking pole with the tooth groove of the parking gear. is displaced to The rotation of the parking gear is restricted (parking lock) by fitting the meshing portion of the parking pole into the tooth groove of the parking gear.

When the parking rod is retracted from the parking pole from this state, the biasing force of the return spring causes the parking pole to rotate about the pole rotating shaft in the disengagement direction, and the meshing portion of the parking pole disengages from the tooth groove of the parking gear. As a result, rotation of the parking gear is allowed (parking lock is released).

A parking support is provided on the opposite side of the parking pole from the parking gear. This parking support prevents the parking rod from escaping from the parking pole when the parking rod advances and retreats.

The parking pole extends between the parking gear and the parking support and extends along the outer circumference of the parking gear, and one end of the parking pole extends upstream in the separating direction with respect to the most downstream portion of the parking gear in the separating direction. positioned. Since one end portion of the parking pole is retracted upstream in the separating direction from the most downstream portion of the parking gear in the separating direction, the position of the parking support can be moved upstream in the separating direction. As a result, it is possible to reduce the amount of bulging of the part of the unit case that is necessary to secure the location for the parking support, thereby making it possible to reduce the size and weight of the transmission unit.

The most downstream portion of the parking support in the disengagement direction may be located at the same position in the disengagement direction as the most downstream portion of the parking rod in the disengagement direction when the meshing portion is engaged with the tooth groove of the parking gear. .

As a result, it is possible to eliminate the need to bulge out a part of the unit case in the direction of detachment in order to secure a place for the parking support, and to achieve further miniaturization and weight reduction of the transmission unit.

The parking support may be provided so that the parking pole comes into contact with it when it rotates in the detachment direction.

In this case, the parking support also functions as a detent of the parking pole by colliding with the parking pole when the parking pole rotates in the leaving direction.

According to the present invention, it is possible to reduce the size and weight of the transmission unit.

1 is a side view showing part of a transmission unit to which a parking lock mechanism according to an embodiment of the invention is applied, showing a parking lock state; FIG. FIG. 4 is a side view showing part of the transmission unit, showing a state in which the parking lock is released; FIG. 4 is a side view showing a portion of the shift unit previously created by the applicant.

BEST MODE FOR CARRYING OUT THE INVENTION Below, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Structure of transmission unit>
1 and 2 are side views showing part of a transmission unit 1 to which a parking lock mechanism 11 according to one embodiment of the invention is applied.

The transmission unit 1 is mounted on a vehicle together with a drive source such as an engine or a motor, and is a unit that shifts the torque generated by the drive source.

A unit case 2 forming an outer shell of the transmission unit 1 is provided with a parking lock mechanism 11 that locks the output shaft 3 of the transmission when the shift lever (select lever) is at the P (parking) position. Although not shown, the shift lever is provided in a vehicle interior at a position that can be operated by the driver.

The parking lock mechanism 11 includes a parking gear 12, a parking pole 13 and two return springs 14,15.

The parking gear 12 is provided so as not to rotate relative to the output shaft 3 . Parking gear 12 may, for example, be spline-coupled directly with output shaft 3 or may be provided integrally with another gear supported by output shaft 3 so as not to rotate relative to it. A large number of teeth 21 are formed on the outer peripheral surface of the parking gear 12 at regular intervals, so that the teeth 21 and tooth grooves 22 are alternately arranged.

A pole rotation shaft 31 is provided on the front side (left side in FIG. 1) of the parking gear 12 in the front-rear direction perpendicular to the rotation axis of the output shaft 3 . The pole rotating shaft 31 is fixed to the unit case 2 and extends parallel to the output shaft 3 .

The parking pole 13 extends in the front-rear direction, and the pawl rotating shaft 31 is loosely inserted at a position closer to the front than the center in the front-rear direction, so that the parking pole 13 can swing about the pawl rotating shaft 31 as a fulcrum. The parking pole 13 includes a main body portion 32 extending from the pole rotating shaft 31 to a position rearward beyond the parking gear 12 above the parking gear 12, and an extension extending from the pole rotating shaft 31 to the opposite side of the parking gear 12 side, that is, to the front side. A portion 33 and a meshing portion 34 that protrudes downward toward the parking gear 12 from the central portion of the main body portion 32 in the front-rear direction. A notch 35 having a substantially triangular shape when viewed from the side is formed in the extended portion 33 .

A spring support shaft 41 is provided on the lower front side of the pole rotating shaft 31 . The spring support shaft 41 is fixed to the unit case 2 and extends parallel to the output shaft 3 and the pole rotation shaft 31 .

The return springs 14 and 15 are torsion springs formed by winding and bending a single metal wire.

The return spring 14 is supported by the spring support shaft 41 by inserting the spring support shaft 41 through the coiled portion of the return spring 14 . One end 42 of the return spring 14 extends forward from the coiled portion and is hooked on the notch 35 of the extension 33 of the parking pole 13 . The other end 43 of the return spring 14 is fixed to the unit case 2 . Due to the elasticity of the return spring 14 , a downward load is applied from the one end 42 of the return spring 14 to the extended portion 33 of the parking pole 13 , and the parking pole 13 moves in the disengagement direction in which the meshing portion 34 disengages from the parking gear 12 . energized.

The return spring 15 is supported by the spring support shaft 41 by inserting the spring support shaft 41 into the coiled portion of the return spring 15 . One end portion 44 of the return spring 15 extends rearward from the coiled portion and is hooked to the main body portion 32 of the parking pole 13 from below. The other end 45 of the return spring 15 is fixed to the unit case 2 . Due to the elasticity of the return spring 15, an upward load is applied from one end portion 44 of the return spring 15 to the body portion 32 of the parking pole 13, and the parking pole 13 is biased in the detachment direction.

A parking rod 51 is provided on the rear side of the parking pole 13 . The parking rod 51 extends in the front-rear direction, and its tip faces the main body portion 32 of the parking pole 13 in the front-rear direction. A cam 52 is provided at the tip of the parking rod 51 . Cam 52 has a conical cam surface 53 whose diameter decreases as it approaches the tip of parking rod 51 . A coil spring 54 is wound around the parking rod 51 at a position on the rear side of the cam 52 . One end of a coil spring 54 is connected to the cam 52 . The other end of the coil spring 54 is fixed to the parking rod 51 .

A control shaft 61 is inserted into the unit case 2 . The control shaft 61 extends vertically. An upper end portion of the control shaft 61 projects upward from the unit case 2, and an outer lever (not shown) is attached to the upper end portion. A control cable (not shown) extending from the shift lever is connected to the outer lever, and a force for operating the shift lever (shift operation force) is input via the control cable. An inner lever 62 is attached to the control shaft 61 within the unit case 2 so as not to rotate relative to the control shaft 61 . A base end portion of the parking rod 51 is bent downward and extends, and is rotatably inserted through the inner lever 62 .

When the shift lever is operated from a position other than the P position to the P position, a shift operation force due to the operation is input to the outer lever to rotate the outer lever, thereby rotating the control shaft 61 and the inner lever 62 integrally with the outer lever. . The rotation of the inner lever 62 advances the parking rod 51 toward the parking pole 13 . When the parking rod 51 advances, the cam surface 53 of the cam 52 comes into contact with the main body portion 32 of the parking pole 13 , and when the parking rod 51 further advances, the cam surface 53 pushes down the main body portion 32 of the parking pole 13 . As a result, the meshing portion 34 of the parking pole 13 fits into one of the tooth grooves 22 of the parking gear 12, and the rotation of the parking gear 12 is restricted (parking lock).

When the shift lever is operated from the P position to a position other than the P position, the shift operation force due to that operation is input to the outer lever, and the movement of the outer lever is opposite to that when the parking lock is applied. Control shaft 61 and inner lever 62 rotate accordingly. The rotation of the inner lever 62 retracts the parking rod 51 from the parking pole 13 . As the parking pole 13 is retracted, the biasing force of the return springs 14 and 15 rotates the parking pole 13 about the pole rotating shaft 31 so that the tip thereof is lifted. As a result, the meshing portion 34 of the parking pole 13 is disengaged from the tooth groove 22 of the parking gear 12, and the rotation of the parking gear 12 is permitted (the parking lock is released).

A steel parking support 71 is provided above the parking pole 13 and the parking rod 51 so as to extend over them. Parking support 71 is formed in a block shape. Since the parking support 71 is provided, when the parking rod 51 advances and retreats, the cam 52 abuts and rubs against the parking support 71 from below, preventing the cam 52 from escaping upward. When the parking pole 13 rotates in the disengagement direction and the meshing portion 34 of the parking pole 13 disengages from the tooth groove 22 of the parking gear 12, the parking pole 13 collides with the parking support 71, and the parking support 71 disengages. It functions as a detent for the parking pole 13 .

Regarding the position of the parking support 71, more specifically, the main body portion 32 of the parking pole 13 enters between the parking gear 12 and the parking support 71 from a position beyond the parking gear 12 to the rear side. extends downward along the outer circumference of the In the parking lock state, the distal end portion 72 of the main body portion 32 is positioned below the uppermost portion of the outer periphery of the parking gear 12 and substantially at the same position in the vertical direction as the uppermost portion of the outer periphery of the output shaft 3 . do. The parking support 71 faces the portion of the main body portion 32 of the parking pole 13 disposed above the parking gear 12 in the longitudinal direction, and the uppermost portion of the parking support 71 faces the uppermost portion of the main portion 32 in the parking lock state. are located in the same position.

<Effect>
As described above, when the parking rod 51 advances toward the parking pole 13 , the parking rod 51 comes into contact with the parking pole 13 , and the parking rod 51 engages the parking pole 13 and the meshing portion 34 of the parking pole 13 engages the parking gear 12 . is displaced in the direction of engagement with the tooth spaces 22 of the . The engagement of the meshing portion 34 of the parking pole 13 with the tooth groove 22 of the parking gear 12 restricts the rotation of the parking gear 12 (parking lock).

When the parking rod 51 withdraws from the parking pole 13 from this state, the biasing force of the return springs 14 and 15 causes the parking pole 13 to rotate about the pole rotating shaft 31 in the separating direction, and the meshing portion 34 of the parking pole 13 is disengaged. It separates from the tooth space 22 of the parking gear 12 . As a result, the rotation of the parking gear 12 is allowed (the parking lock is released).

A parking support 71 is provided on the side of the parking pole 13 opposite to the parking gear 12 . The parking support 71 can prevent the parking rod 51 from escaping from the parking pole 13 when the parking rod 51 advances and retreats.

The parking pole 13 enters between the parking gear 12 and the parking support 71 and extends along the outer circumference of the parking gear 12, and the distal end portion 72 of the main body portion 32 is located on the most downstream side of the parking gear 12 in the separation direction. It is located on the lower side, which is the upstream side in the detachment direction, with respect to the uppermost portion, which is the portion. Since the distal end portion 72 is retracted downward from the uppermost portion of the parking gear 12, the position of the parking support 71 can be moved downward. As a result, it is possible to reduce the bulging amount of a part of the unit case 2 that is necessary to secure the location for the parking support 71, thereby making it possible to reduce the size and weight of the transmission unit 1. can.

The uppermost portion of the parking support 71 may be positioned vertically at the same position as the uppermost portion of the parking rod 51 in the disengaging direction when the meshing portion 34 is engaged with the tooth groove 22 of the parking gear 12 .

As a result, there is no need to bulge a portion of the unit case 2 upward in order to secure a place for the parking support 71, so that the transmission unit 1 can be further reduced in size and weight. can.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other forms. It is possible to apply

1: Transmission Unit 2: Unit Case 12: Parking Gear 13: Parking Pole 14, 15: Return Spring 22: Tooth Groove 31: Pole Rotation Axis 34: Engaging Portion 51: Parking Rod 71: Parking Support 72: Tip (One End )

Claims (1)

A parking lock mechanism housed in a unit case of a transmission unit,
a parking gear provided so as not to rotate relative to a rotating shaft rotatable about a predetermined rotation axis;
a parking pole provided swingably around a pole rotation shaft parallel to the rotation axis, and having a meshing portion that engages and disengages from the tooth groove of the parking gear by swinging;
a return spring that biases the parking pole in a detachment direction in which the meshing portion is detached from the tooth space;
It is provided so as to be able to advance and retreat with respect to the parking pole, and advances to the parking pole side from a state in which the meshing portion is disengaged from the tooth space, contacts one end portion of the parking pole, and moves the parking pole to the above. a parking rod displaced in an engagement direction in which the meshing portion engages with the tooth groove of the parking gear;
a parking support disposed on the side opposite to the parking gear with respect to the parking pole, and provided so as to enter between and rub against the one end of the parking pole when the parking rod advances or retreats,
The parking pole enters between the parking gear and the parking support and extends along the outer circumference of the parking gear, and with the meshing portion engaged with the tooth space, the engagement portion at the one end portion is extended. A parking lock mechanism, wherein an endmost portion in the connecting direction is located at the same position in the detaching direction as an endmost portion in the detaching direction on the outer circumference of the rotating shaft or located closer to the rotational axis than the same position .

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