US-12624757-B2 - Parking lock device

US12624757B2US 12624757 B2US12624757 B2US 12624757B2US-12624757-B2

Abstract

A parking lock device includes: an electric motor; and a mechanism including a lock member configured to detachably engage with a parking gear and operate based on output from the electric motor. The mechanism includes a first mechanism part configured to switch a state of the parking gear between a locked state and an unlocked state by moving the lock member based on output from the electric motor, and a second mechanism part configured to switch a state of the parking gear from a locked state to an unlocked state by moving the lock member based on an external input generated manually. When the parking gear is in a locked state, in the first mechanism part, a relation between the second mechanism part and the electric motor is switchable between connection and disconnection with the second mechanism part on the basis of an output from the electric motor.

Inventors

Koichi Asano
Masahiro TSURUTA
Yasuhiro Tominaga
Motoki Ogata

Assignees

AISIN CORPORATION

Dates

Publication Date: 20260512
Application Date: 20250513
Priority Date: 20240530

Claims (4)

1 . A parking lock device comprising: an electric motor; and a mechanism including a lock member configured to detachably engage with a parking gear and operate on the basis of an output from the electric motor, wherein the mechanism includes a first mechanism part configured to switch a state of the parking gear between a locked state and an unlocked state by moving the lock member on the basis of the output from the electric motor, and a second mechanism part configured to switch the state of the parking gear from the locked state to the unlocked state by moving the lock member on the basis of an external input generated manually, when the parking gear is in the locked state, in the first mechanism part, a relation between the second mechanism part and the electric motor is switchable between connection and disconnection with the second mechanism part on the basis of the output from the electric motor, the first mechanism part includes a linear motion mechanism configured to convert a rotational output from the electric motor into a linear motion in a first direction, and a movable member facing an output member of the linear motion mechanism in the first direction and configured to linearly move in the first direction on the basis of an input in the first direction received from the linear motion mechanism, the lock member operates on the basis of a linear motion of the movable member in the first direction, the second mechanism part is configured to cause the movable member to generate a linear motion in the first direction on the basis of the external input, and when the parking gear is in the locked state, a gap for making a relation between the second mechanism part and the electric motor disconnected is formed between the movable member and the output member of the linear motion mechanism in the first direction on the basis of the output from the electric motor.
2 . The parking lock device according to claim 1 , wherein the first mechanism part is configured to change, on the basis of the linear motion of the movable member in the first direction, force in a second direction intersecting in the first direction, the force acting on the lock member, and the lock member is configured to switch a state of the parking gear from the unlocked state to the locked state on the basis of a change in force in the second direction.
3 . The parking lock device according to claim 2 , further comprising a control device configured to control the electric motor, wherein the control device is configured to eliminate the gap and apply an input to the movable member in the first direction by moving the output member of the linear motion mechanism along the first direction via the electric motor, in a case of switching the state of the parking gear from the locked state to the unlocked state.
4 . The parking lock device according to claim 1 , further comprising a control device configured to control the electric motor, wherein the control device is configured to eliminate the gap and apply an input to the movable member in the first direction by moving the output member of the linear motion mechanism along the first direction via the electric motor, in a case of switching the state of the parking gear from the locked state to the unlocked state.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is based on and claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2024-087602, filed on May 30, 2024, the entire content of which is incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to a parking lock device. BACKGROUND DISCUSSION There is known a technique of, in a parking lock device, separating power transmission between an actuator (electric motor) and a mechanism part by using a clutch provided between the actuator and the mechanism part, in order to reduce operation force required when manually switching from a locked state to an unlocked state (for example, JP 2008-174188 A). However, in a conventional technique as described above, a clutch is required, and thus may have a problem of an increase in the number of parts. A need thus exists for a parking lock device which is not susceptible to the drawback mentioned above. SUMMARY A parking lock device includes: an electric motor; and a mechanism including a lock member configured to detachably engage with a parking gear and operate on the basis of an output from the electric motor. The mechanism includes a first mechanism part configured to switch a state of the parking gear between a locked state and an unlocked state by moving the lock member on the basis of an output from the electric motor, and a second mechanism part configured to switch a state of the parking gear from a locked state to an unlocked state by moving the lock member on the basis of an external input generated manually. When the parking gear is in a locked state, in the first mechanism part, a relation between the second mechanism part and the electric motor is switchable between connection and disconnection with the second mechanism part on the basis of an output from the electric motor. BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and additional features and characteristics of this disclosure will become more apparent from the following detailed description considered with the reference to the accompanying drawings, wherein: FIG. 1 is a diagram schematically showing a main part of a parking lock device according to the present embodiment (locked state); FIG. 2 is a diagram schematically showing the main part of the parking lock device according to the present embodiment (unlocked state); FIG. 3 is a view showing an example of a first mechanism part according to a first embodiment (locked state); FIG. 4 is a plan view of a main part of the first mechanism part according to the first embodiment, as viewed from below; FIG. 5 is a view showing an example of the first mechanism part according to the first embodiment (unlocked state); FIG. 6 is a diagram showing an example of a configuration of hardware of a control device of the parking lock device; FIG. 7 is an explanatory diagram showing an example of preferable drive (example of control) of an electric motor at a time of transition from the locked state to the unlocked state; FIG. 8A is a view showing an example of a first mechanism part according to a second embodiment (locked state); FIG. 8B is an enlarged view of a portion Q8 in FIG. 8A; FIG. 9 is a plan view of a main part of the first mechanism part according to the second embodiment, as viewed from top; FIG. 10 is a view showing an example of a first mechanism part according to a third embodiment (locked state); and FIG. 11 is a plan view of a main part of the first mechanism part according to the third embodiment, as viewed from below. DESCRIPTION OF EMBODIMENTS Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Dimension ratios in the drawings are merely examples and are not limited thereto, and shapes and the like in the drawings may be partially exaggerated for convenience of description. Furthermore, in the drawings, simply some of a plurality of parts having the same attribute may be denoted by reference signs for the sake of clarity. In the following description, “connection” means “mechanical connection” and means connection in a connection form capable of power transmission unless otherwise specified. FIGS. 1 and 2 are diagrams schematically showing a main part of a parking lock device 1 according to the present embodiment. FIG. 1 shows a locked state, and FIG. 2 shows an unlocked state. In FIGS. 1 and 2, a mechanism 20 described below is shown very schematically. The parking lock device 1 includes an electric motor 10 and the mechanism 20. The electric motor 10 is controlled by a control device (not shown). The electric motor 10 generates a rotational output at a time of driving. The electric motor 10 is connected to the mechanism 20 so that the rotational output can be transmitted to the mechanism 20. The mechanism 20 includes a first mechanism part 21 and a second mechanism part 22. The first mechanism part 21 switches a state of a parking gear 41 between the locked state (FIG. 1) and the unlocked state