JP2020085223A - Parking lock mechanism - Google Patents

Abstract

To provide a parking lock mechanism that can miniaturize and reduce weight of a transmission unit.SOLUTION: A parking lock mechanism is provided with a parking support 71 on an opposite side to a parking gear 12 relative to a parking pole 13. The parking pole 13 enters between the parking gear 12 and the parking support 71 and extends along an outer periphery of the parking gear 12. A tip 72 of a body part 32 is positioned on a lower side relative to an uppermost part in the parking gear 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle parking lock mechanism.

A vehicle such as an automobile is equipped with a transmission unit that shifts the torque generated by a drive source such as an engine. The concept of the speed change unit includes not only a transmission (transmission) but also a transaxle integrally including a transmission and a differential gear (differential device).

JP, 2013-209090, A

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

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 located at the P (parking) position.

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

The parking gear 104 is provided so as not to rotate relative to the 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 that forms an outer shell of the transmission unit 101 via a pole rotation shaft 107 that extends in the left-right direction. A meshing portion 109 that projects toward the parking gear 104 is formed in the middle 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.

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

When the shift lever (select lever) provided in the vehicle interior of the vehicle is operated to operate the shift lever from a position other than the P (parking) position to the P position, the shift operation force by the operation is applied to the parking rod 106. After being transmitted, the parking rod 106 advances to the parking pole 105 side. When the parking rod 106 further advances after the cam 112 contacts the tip of the parking pole 105 due to the advance of the parking rod 106, the tip of the parking pole 105 is resisted by the cam 112 against the biasing force of the return springs 110 and 111. Is pushed down. As a result, the meshing portion 109 of the parking pole 105 is fitted 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 by the operation is transmitted to the parking rod 106, and the parking rod 106 retracts from the parking pole 105. As the parking pole 105 retreats, the parking pole 105 is rotated about the pole rotation shaft 107 so that its tip is lifted by the biasing force of the return springs 110 and 111. 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 rotation of the parking gear 104 is allowed (parking lock is released).

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

Since the parking rod 106 enters between the parking pole 105 and the parking support 113, the parking support 113 has to be disposed 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 be bulged upward in order to secure a place for arranging the parking support 113, which causes a problem that the outer shape of the transmission unit 101 is large and the transmission unit 101 becomes heavy. ..

An object of the present invention is to provide a parking lock mechanism that can reduce the size and weight of a transmission unit.

In order to achieve the above-mentioned 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 gear being rotatably provided around a predetermined rotation axis. A parking pole that is swingably provided about a pole rotation axis that is parallel to the rotation axis and that engages and disengages with the tooth groove of the parking gear due to the swing, and A return spring that urges in the direction of separation from the groove and a parking spring that can be advanced and retracted with respect to the parking pole, and advances toward the parking pole from the state where the meshing part is disengaged from the tooth groove. The parking rod disposes on the side opposite to the parking gear with respect to the parking pole by abutting and displacing the parking pole in the direction in which the meshing part engages with the tooth groove of the parking gear. A parking support that is provided so as to enter and slide between the parking gear and the parking gear, and the parking pole extends between the parking gear and the parking support and extends along the outer periphery of the parking gear. Is located on the upstream side in the detaching direction with respect to the most downstream portion of the parking gear in the detaching direction.

With this configuration, when the parking rod advances toward the parking pole, the parking rod abuts the parking pole, and the parking rod engages the parking pole with the meshing portion of the parking pole in the tooth groove of the parking gear. Shift to. When the meshing portion of the parking pole is fitted into the tooth groove of the parking gear, the rotation of the parking gear is restricted (parking lock).

When the parking rod retracts from the parking pole from that state, the parking pole is rotated in the disengagement direction about the pole rotation shaft as a fulcrum by the urging force of the return spring, and the meshing portion of the parking pole disengages from the tooth groove of the parking gear. As a result, the rotation of the parking gear is allowed (the parking lock is released).

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

Then, 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 of the parking pole is located upstream of the most downstream side portion of the parking gear in the detaching direction. positioned. Since one end portion of the parking pole is retracted and arranged on the upstream side in the detaching direction with respect to the most downstream side portion of the parking gear in the detaching direction, the position of the parking support can be moved to the upstream side in the detaching direction. As a result, it is possible to reduce the amount of bulging of a part of the unit case that is required to secure a place for arranging the parking support, and thus it is possible to reduce the size and weight of the transmission unit.

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

As a result, it is not necessary to bulge a part of the unit case in the detaching direction in order to secure a place for disposing the parking support, and it is possible to further reduce the size and weight of the transmission unit.

The parking support may be provided so that the parking pole comes into contact with the rotating pole in the separating direction.

In this case, the parking support also functions as a detent for the parking pole due to the collision of the parking pole when the parking pole rotates in the detaching direction.

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

FIG. 3 is a side view showing a part of the transmission unit to which the parking lock mechanism according to the embodiment of the present invention is applied, showing a parking lock state. FIG. 6 is a side view showing a part of the transmission unit, showing a state in which a parking lock is released. It is a side view which shows some transmission units which the applicant created first.

Hereinafter, 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 a part of a transmission unit 1 to which a parking lock mechanism 11 according to an embodiment of the present invention is applied.

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

A parking lock mechanism 11 that locks the output shaft 3 of the transmission when the shift lever (select lever) is located at the P (parking) position is provided in the unit case 2 that forms the outer shell of the transmission unit 1. Although not shown, the shift lever is provided at a position where the driver can operate it in the passenger compartment of the vehicle.

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

The parking gear 12 is provided so as not to rotate relative to the output shaft 3. The parking gear 12 may be directly spline-coupled to the output shaft 3, or may be integrally provided with another gear that is supported by the output shaft 3 so as not to be relatively rotatable. 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 the tooth spaces 22 are alternately arranged.

A pole rotation shaft 31 is provided on the front side (left side in FIG. 1) in the front-rear direction orthogonal to the rotation axis of the output shaft 3 with respect to the parking gear 12. The pole rotation 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 pole rotation 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 is swingable about the pole rotation shaft 31. The parking pole 13 includes a main body portion 32 extending from the pole rotation shaft 31 to a position beyond the parking gear 12 above the parking gear 12, and an extension extending from the pole rotation shaft 31 to the side opposite to the parking gear 12 side, that is, to the front side. The portion 33 and the meshing portion 34 that protrudes downward from the central portion of the main body portion 32 in the front-rear direction toward the parking gear 12 are integrally provided. A notch 35 having a substantially triangular shape in a side view is formed in the extending portion 33.

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

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

The return spring 14 is supported by the spring support shaft 41 by inserting the spring support shaft 41 into 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 in 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 portion 42 of the return spring 14 to the extension 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. Being 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 44 of the return spring 15 extends rearward from a portion wound in a coil shape and is hooked from below on the main body 32 of the parking pole 13. 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 the one end portion 44 of the return spring 15 to the main body portion 32 of the parking pole 13, and the parking pole 13 is biased in the detaching 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 front end 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. The cam 52 has a conical cam surface 53 whose diameter decreases as it approaches the tip of the parking rod 51. A coil spring 54 is wound around the parking rod 51 at a position rearward 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 in the unit case 2. The control shaft 61 extends in the vertical direction. An upper end portion of the control shaft 61 projects above the unit case 2, and an outer lever (not shown) is attached to the upper end portion thereof. A control cable (not shown) extending from the shift lever is connected to the outer lever, and force for operating the shift lever (shift operation force) is input via the control cable. Further, an inner lever 62 is attached to the control shaft 61 in the unit case 2 so as not to rotate relative to each other. The base end portion of the parking rod 51 is bent and extends downward, and is rotatably inserted in the inner lever 62.

When the shift lever is operated from a position other than the P position to the P position, the shift operation force by the operation is input to the outer lever, the outer lever rotates, and the control shaft 61 and the inner lever 62 rotate integrally with the outer lever. .. The rotation of the inner lever 62 causes the parking rod 51 to advance to the parking pole 13 side. When the parking rod 51 advances, the cam surface 53 of the cam 52 contacts the main body portion 32 of the parking pole 13, and when the parking rod 51 further advances, the main surface portion 32 of the parking pole 13 is pushed down by the cam surface 53. As a result, the meshing portion 34 of the parking pole 13 is fitted into one of the tooth spaces 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 the operation is input to the outer lever, and the outer lever rotates by a movement opposite to that at the time of parking lock, and the outer lever is integrated with the outer lever. The control shaft 61 and the inner lever 62 rotate. The rotation of the inner lever 62 causes the parking rod 51 to retract from the parking pole 13. As the parking pole 13 is retracted, the parking pole 13 is rotated about the pole rotation shaft 31 so that its tip end is lifted by the biasing force of the return springs 14 and 15. 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 rotation of the parking gear 12 is allowed (parking lock is released).

Above the parking pole 13 and the parking rod 51, an iron parking support 71 is provided so as to straddle above them. The parking support 71 is formed in a block shape. By providing the parking support 71, when the parking rod 51 moves forward and backward, the cam 52 abuts against the parking support 71 from below and rubs against it, and the cam 52 is prevented from escaping upward. Further, 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 moves. 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, and the parking gear 12 Extends downward along the outer periphery of the. In the parking lock state, the tip portion 72 of the main body portion 32 is located at a position lower than the uppermost portion of the outer periphery of the parking gear 12, and substantially at the same position as the uppermost portion of the outer periphery of the output shaft 3 in the vertical direction. To do. The parking support 71 opposes a portion of the main body portion 32 of the parking pole 13 arranged above the parking gear 12 in the front-rear direction, and an uppermost portion of the parking support 71 is vertically aligned with an uppermost portion of the main body portion 32 in the parking lock state. Located in the same position.

<Effect>
As described above, when the parking rod 51 advances to the parking pole 13 side, the parking rod 51 abuts on the parking pole 13, and the parking rod 51 causes the parking pole 13 to engage with the meshing portion 34 of the parking pole 13. Is displaced in the direction in which it engages with the tooth space 22 of the. By fitting the meshing portion 34 of the parking pole 13 into the tooth groove 22 of the parking gear 12, the rotation of the parking gear 12 is restricted (parking lock).

When the parking rod 51 is retracted from the parking pole 13 from that state, the parking pole 13 is rotated in the disengagement direction with the pole rotation shaft 31 as a fulcrum by the urging force of the return springs 14 and 15, and the meshing portion 34 of the parking pole 13 is moved. The parking gear 12 is disengaged from the tooth groove 22. As a result, the rotation of the parking gear 12 is allowed (parking lock is released).

A parking support 71 is provided on the side opposite to the parking gear 12 with respect to the parking pole 13. The parking support 71 can prevent the parking rod 51 from escaping from the parking pole 13 when the parking rod 51 moves back and forth.

The parking pole 13 enters between the parking gear 12 and the parking support 71 and extends along the outer periphery of the parking gear 12, and the tip portion 72 of the main body portion 32 is the most downstream side of the parking gear 12 in the detaching direction. It is located on the lower side which is the upstream side in the detaching direction with respect to the uppermost portion which is the portion. The position of the parking support 71 can be moved to the lower side by the amount that the front end portion 72 is retracted and arranged below the uppermost portion of the parking gear 12. As a result, it is possible to reduce the amount of bulging of a part of the unit case 2 that is necessary to secure a place for arranging the parking support 71, and thereby to reduce the size and weight of the transmission unit 1. it can.

The uppermost portion of the parking support 71 may be located at the same position in the up-down direction as the uppermost portion of the parking rod 51 in the disengagement direction when the meshing portion 34 is engaged with the tooth groove 22 of the parking gear 12.

As a result, it is possible to eliminate the need to bulge a part of the unit case 2 upward in order to secure a place for disposing the parking support 71, and it is possible to further reduce the size and weight of the transmission unit 1. it can.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can be implemented in other forms, and the above-described configuration may be modified in various ways within the scope of the matters described in the claims. 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 shaft 34: Engagement part 51: Parking rod 71: Parking support 72: Tip part (one end part) )

Claims (1)

A parking lock mechanism housed in the unit case of the transmission unit,
A parking gear rotatably provided around a predetermined rotation axis,
A parking pole having a meshing portion that is swingably provided about a pole rotation axis parallel to the rotation axis and that engages and disengages with a tooth groove of the parking gear by the swinging,
A return spring for urging the parking pole in a disengagement direction in which the meshing part disengages from the tooth groove;
The parking pole is provided so as to be able to advance and retract with respect to the parking pole, advances toward the parking pole from a state where the meshing portion is disengaged from the tooth groove, and abuts on one end of the parking pole to move the parking pole to the above-mentioned position. A parking rod for displacing a meshing portion in a direction of engaging 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, the parking rod being provided so as to slide into and rub against the one end of the parking pole when the parking rod advances and retreats;
The parking pole is inserted between the parking gear and the parking support and extends along the outer periphery of the parking gear, and the one end is located at the most downstream side portion of the parking gear in the disengagement direction. A parking lock mechanism located on the upstream side in the detaching direction.