JP6424779B2 - Parking lock mechanism and parking lock method - Google Patents

Description

  The present invention relates to a parking lock mechanism and a parking lock method.

  BACKGROUND Conventionally, a parking lock mechanism has been known that suppresses the drive of a reduction gear such as an electric vehicle (see, for example, Patent Document 1). The parking lock mechanism is integrally provided with a swinging member provided so as to be able to swing about a shaft and the swinging member, and provided so as to be engageable with the gear of the reduction gear by the swinging of the swinging member. An engagement member is provided, and rotation of the gear is suppressed by engaging the gear and the engagement member.

JP, 2006-217726, A

  In the parking lock mechanism, a regulating member is provided which abuts on the swinging member at a position where the engaging member engages with the gear to regulate swinging of the swinging member, and causes the swinging member to abut on the regulating member Thus, the position of the swinging member is grasped. In this configuration, when the swinging member abuts on the regulating member, the swinging member may swing in the direction opposite to the swinging direction due to the reaction. In this case, the engaging member and the gear may not be engaged sufficiently.

  According to the present invention, it is an object of the present invention to provide a parking lock mechanism and a parking lock method capable of reliably engaging an engagement member with a gear.

  The parking lock mechanism according to the present invention is integrally provided with a swinging member provided swingably around a shaft and the swinging member, and is provided so as to be engageable with the gear by the swinging of the swinging member. A locking portion having an engaging member, a regulating portion for contacting the swinging member at a position where the engaging member engages with the gear to limit swinging of the swinging member, and swinging the swinging member The control unit includes a motor and a control unit that controls the drive of the motor, and the control unit controls the drive of the motor so that the engaging member engages with the gear to swing the swinging member in one direction. The driving of the motor is stopped when the moving member and the regulating portion abut, and the driving of the motor is controlled such that the swinging member swings in one direction when a predetermined time has elapsed from the stopping.

  In this parking lock mechanism, the control unit stops driving of the motor when the rocking member and the regulating portion abut, and when it is determined that a predetermined time has elapsed from the stop, the rocking member is in one direction. The drive of the motor is controlled to swing. Thereby, in the parking lock mechanism, even if the swinging member swings in the other direction opposite to the one direction by reaction when the swinging member abuts on the regulating portion, the swinging member In order to control the drive of the motor so as to swing in one direction, the swinging member can be stopped at a position in contact with the regulating portion. Therefore, the engagement member provided on the rocking member stops at the position where it engages with the gear. Therefore, in the parking lock mechanism, the engagement member can be reliably engaged with the gear.

  In one embodiment, the control unit makes the current value for driving the motor when the predetermined time has elapsed smaller than the current value for driving the motor when the rocking member is brought into contact with the regulating unit. You may If the driving force for swinging the swinging member in one direction is too large, there is a possibility that the swinging member abuts on the regulating portion again. Therefore, in the parking lock mechanism, by reducing the current value for driving the motor, a suitable driving force can be realized by the motor in order to resist the reaction when the swinging member and the regulation portion abut. As a result, the engagement member can be stopped at the position where it engages with the gear.

  In one embodiment, the motor is a three-phase motor, and the control unit may supply current to one of the three phases when driving the motor when a predetermined time has elapsed. As described above, by supplying current to only one phase in the three-phase motor, it is possible to realize an appropriate driving force by the motor in order to resist a reaction when the swinging member and the regulation portion abut. As a result, the engagement member can be stopped at the position where it engages with the gear.

  In the parking lock method of the present invention, a swinging member provided so as to be able to swing around a shaft, and the swinging member are integrally provided, and are provided so as to be engageable with a gear by the swinging of the swinging member. A locking portion having an engaging member; a regulating portion which abuts against the swinging member at a position where the engaging member engages with the gear to limit swinging of the swinging member; and a motor for swinging the swinging member And a control unit for controlling the drive of the motor, wherein the control unit controls the drive of the motor to engage the engaging member with the gear to control the swing member Is rocked in one direction, and the driving of the motor is stopped when the rocking member and the regulation part abut, and the rocking member is rocked in one direction when a predetermined time has elapsed from the stop. Control the drive of the motor.

  In this parking lock method, the control unit controls the drive of the motor so that the engaging member is engaged with the gear to swing the swinging member in one direction, and the swinging member abuts against the regulating portion. In this case, when the drive of the motor is stopped and it is determined that the predetermined time has elapsed from the stop, the drive of the motor is controlled such that the swinging member swings in one direction. Thereby, in the parking lock method, even if the swinging member swings in the other direction opposite to the one direction due to reaction when the swinging member abuts on the regulating portion, the swinging member after a predetermined time has elapsed Controls the drive of the motor so that it swings in one direction. Therefore, in the parking lock method, the swinging member can be stopped at a position in contact with the regulating portion. Therefore, the engagement member provided on the rocking member stops at the position where it engages with the gear. Therefore, in the parking lock method, the engagement member can be reliably engaged with the gear.

  According to the present invention, the engagement member can be reliably engaged with the gear.

FIG. 1 is a view showing the configuration of a parking lock mechanism according to an embodiment. FIG. 2 is a view showing the positional relationship between the swinging member and the restricting portion. FIG. 3 is a block diagram showing the configuration of the parking lock mechanism. FIG. 4 is a diagram showing the relationship between the current supplied to the motor and time. FIG. 5 is a flowchart for explaining the operation of the control unit. FIG. 6 is a diagram showing the relationship between the current supplied to the motor and time in the parking lock mechanism according to another embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

  FIG. 1 is a view showing the configuration of a parking lock mechanism according to an embodiment. The parking lock mechanism 1 shown in FIG. 1 mechanically fixes an output shaft of an in-wheel motor of a vehicle such as an electric vehicle. The parking lock mechanism 1 suppresses, for example, the rotation of the gear 100 fixed to the output shaft in the reduction gear in the in-wheel motor. As shown in FIGS. 1 to 3, the parking lock mechanism 1 includes a lock 3, a restrictor 5, a motor 7, and a controller 9.

  The lock unit 3 suppresses the rotation of the gear 100. The lock portion 3 includes a swing member 10 and an engagement member 12. The swinging member 10 has, for example, a trapezoidal shape. The swing member 10 is fixed to the output shaft 7 a of the motor 7 at one end (the side with a smaller width). The swinging member 10 is swingably provided around the output shaft 7a.

  The engagement member 12 is fixed to the rocking member 10 and integrally provided with the rocking member 10. The engagement member 12 moves in synchronization with the swing of the swing member 10. The engagement member 12 is provided to be engageable with the gear 100. Specifically, the engagement member 12 has a main body portion 12a and an engagement portion 12b. The main body 12 a is an elongated member, and one end thereof is fixed to the swinging member 10. The engaging portion 12 b is provided at the other end of the main body portion 12 a. The engaging portion 12 b is provided, for example, in the main body portion 12 a so that the extending direction thereof is orthogonal to the extending direction of the main body portion 12 a. That is, the engagement member 12 has a substantially L-shape. The engagement portion 12 b enters between the teeth 102 and the teeth 102 of the gear 100 and engages with the gear 100 in response to the swing of the swing member 10.

  The restricting portion 5 restricts the swinging of the swinging member 10 of the lock portion 3. As shown in FIG. 2, the restricting portion 5 includes a first restricting member 14 and a second restricting member 16. The first restricting member 14 and the second restricting member 16 restrict the swing range of the swing member 10. The first restricting member 14 restricts the swinging of the swinging member 10 when the swinging member 10 swings in one direction (counterclockwise direction in the present embodiment). The first restricting member 14 abuts on the rocking member 10 at a position where the engaging member 12 engages with the gear 100 to restrict the rocking of the rocking member 10. The first restricting member 14 restricts the rocking of the rocking member 10 by contacting the side surface 10 a of the rocking member 10.

  The second regulating member 16 regulates the swinging of the swinging member 10 when the swinging member 10 swings in the other direction (clockwise direction in this embodiment) opposite to the one direction. The second restricting member 16 abuts on the rocking member 10 at a position where the engagement member 12 is disengaged from the gear 100 and restricts the rocking of the rocking member 10. The second regulating member 16 regulates the swinging of the swinging member 10 by coming into contact with the other side surface 10 b of the swinging member 10. The first restricting member 14 and the second restricting member 16 are fixed to a motor case (not shown).

  The motor 7 is a drive source that causes the swinging member 10 to swing. In the present embodiment, the motor 7 is a three-phase (V-phase, U-phase, W-phase) motor. The output shaft 7 a of the motor 7 is fixed to one end of the swing member 10. Driving of the motor 7 is controlled by the control unit 9.

  The controller 9 controls the drive of the motor 7. The control unit 9 is configured of a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a hard disk, and the like. The control unit 9 loads a program stored in the ROM into the RAM and executes the program by the CPU to execute various processes.

  The control unit 9 controls the drive (torque) of the motor 7 by controlling the supply of current to the motor 7. Specifically, control unit 9 controls the current value in the DC power supplied to inverter 18 (see FIG. 3). The inverter 18 converts the DC power supplied from the power supply into AC power different in phase from each other by 120 ° and outputs the AC power to the motor 7.

  The control unit 9 controls driving of the motor 7 based on a stop signal output from, for example, an ECU (Electric Control Unit), a signal instructing stop of the rotation of the output shaft in the reduction gear of the in-wheel motor. When the control unit 9 receives the stop signal, the control unit 9 controls the drive of the motor 7 so that the engaging member 12 is engaged with the gear 100 to swing the swinging member 10 in one direction. Specifically, the control unit 9 controls so that alternating current power is supplied to two phases of the motor 7. At this time, as shown in FIG. 4, the current value of the current supplied to the motor 7 is the first current value S1.

  The controller 9 controls the driving of the motor 7 to rock the rocking member 10, and then stops the driving of the motor 7 when the rocking member 10 and the first regulating member 14 abut on each other. . Specifically, based on the signal output from the detection unit 20 (see FIG. 3) that detects the rotation of the output shaft 7 a of the motor 7, the control unit 9 controls the swinging member 10 to contact the first restricting member 14. Get the contact. The detection unit 20 is, for example, an encoder. The detection unit 20 detects the rotation (rotational speed, position) of the output shaft 7 a and outputs a signal corresponding to the rotation to the control unit 9. When the controller 9 indicates that the rotation of the output shaft 7 a of the motor 7 is stopped in the signal output from the detector 20 (for example, when the signal indicating the rotation becomes “0”) It is determined that the swinging member 10 and the first regulating member 14 are in contact with each other, and the driving of the motor 7 is stopped.

  The control unit 9 controls the drive of the motor 7 so that the swinging member 10 swings in one direction when a predetermined time has elapsed since the drive of the motor 7 was stopped. Specifically, as shown in FIG. 4, assuming that the time when the operation of motor 7 is stopped is “t0,” control unit 9 determines whether or not first predetermined time t1 has elapsed from time t0. Do. The first predetermined time t1 is a time appropriately set in accordance with the configurations of the lock unit 3 and the restriction unit 5.

  When the control unit 9 determines that the first predetermined time t1 has elapsed from the time t0, the driving of the motor 7 is performed such that the swinging member 10 swings in one direction (counterclockwise direction in the present embodiment). Control. Specifically, the control unit 9 controls so that AC power is supplied to one phase of the motor 7. At this time, as shown in FIG. 4, the current value of the current supplied to the motor 7 is the second current value S2. The second current value S2 is a constant value, which is about half of the first current value S1. As a result of the control unit 9 controlling the drive of the motor 7 so that the swinging member 10 swings in one direction, the swinging member 10 may not swing in one direction. When the swinging member 10 tries to swing in the other direction opposite to the one direction by the reaction when the swinging member 10 abuts on the first regulating member 14, the swinging member 10 swings in one direction. As a result of controlling the drive of the motor 7 to move and exerting a force in a direction against reaction, the rocking member 10 may be stopped without rocking. That is, even when the motor 7 is controlled by the control unit 9 so that the swinging member 10 swings in one direction, the swinging member 10 may not actually swing.

  The control unit 9 determines whether the second predetermined time t2 has elapsed since the drive of the motor 7 is restarted. Specifically, the control unit 9 determines whether a second predetermined time t2 has elapsed from the first predetermined time t1. The second predetermined time t2 is a time appropriately set according to the configurations of the lock unit 3 and the restriction unit 5. When the controller 9 determines that the second predetermined time t2 has elapsed from the first predetermined time t1, the control unit 9 stops the driving of the motor 7.

  Subsequently, the operation (parking lock method) of the control unit 9 will be described with reference to FIG. FIG. 5 is a flowchart for explaining the operation of the control unit 9.

  As shown in FIG. 4, the control unit 9 determines whether the rocking member 10 abuts on the first restricting member 14 based on the signal output from the detection unit 20 (step S 01). When the control unit 9 determines that the rocking member 10 abuts on the first regulating member 14, as shown in FIG. 5, the control unit 9 stops the supply of current to the motor 7 to drive the motor 7. It is stopped (step S02). On the other hand, when the controller 9 does not determine that the rocking member 10 is in contact with the first restricting member 14, the controller 9 repeats the process of step S 01.

  Subsequently, the control unit 9 determines whether the first predetermined time t1 has elapsed since the driving of the motor 7 is stopped (step S03). When determining that the first predetermined time t1 has elapsed, the control unit 9 drives the motor 7 again (step S04). On the other hand, when the controller 9 does not determine that the first predetermined time t1 has elapsed, the control unit 9 repeats the same processing until the first predetermined time t1 elapses.

  After driving motor 7 (after supply of current to motor 7 is started), controller 9 determines whether or not second predetermined time t2 has elapsed (step S05). If it is determined that the second predetermined time t2 has elapsed, the control unit 9 stops the supply of current to the motor 7 and stops the driving of the motor 7 (step S06). On the other hand, when the controller 9 does not determine that the second predetermined time t2 has elapsed, the control unit 9 repeats the same processing until the second predetermined time t2 elapses.

  As described above, in the parking lock mechanism 1 according to the present embodiment, the control unit 9 stops the driving of the motor 7 when the swinging member 10 and the first restricting member 14 abut each other, and the stop is performed. If it is determined that a predetermined time has elapsed since the time t1, the drive of the motor 7 is controlled so that the swinging member 10 swings in one direction. Thereby, in the parking lock mechanism 1, even if the swinging member 10 swings in the other direction opposite to the one direction by the reaction when the swinging member 10 abuts on the first regulating member 14, the predetermined time In order to control the drive of the motor 7 so that the swinging member 10 swings in one direction after progress, the swinging member 10 can be stopped at a position in contact with the first regulating member 14. Therefore, the engagement member 12 provided on the rocking member 10 stops at a position where it engages with the gear 100. Therefore, in the parking lock mechanism 1, the engagement member 12 can be reliably engaged with the gear 100.

  In the present embodiment, the motor 7 is a three-phase motor. When driving the motor 7 when the first predetermined time t1 has elapsed, the control unit 9 supplies current to one of the three phases. If the driving force for swinging the swinging member 10 in one direction is too large, there is a possibility that the swinging member 10 and the first restricting member 14 abut again. Therefore, in the parking lock mechanism 1, by supplying current to only one phase in the three-phase motor 7, the parking lock mechanism 1 is suitable for resisting reaction when the swinging member 10 and the first regulating member 14 abut. The driving force can be realized by the motor 7. As a result, the engagement member 12 can be stopped at the position where it engages with the gear 100.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the contact between the rocking member 10 and the first restricting member 14 is obtained based on the output signal of the detection unit 20 that detects the rotation of the output shaft 7a. The abutment between the member 10 and the first regulating member 14 may be obtained by other means. As a detection part, contact of the rocking member 10 and the 1st control member 14 may be detected mechanically or optically, for example.

  In the above embodiment, as shown in FIG. 5, the control unit 9 controls so that a current of a constant second current value S2 is supplied from the first predetermined time t1 to the second predetermined time t2. However, as shown in FIG. 6, the control unit 9 may control so that the current value gradually decreases from the first predetermined time t1 to the second predetermined time t2.

  In the above embodiment, the rocking member 10 has a trapezoidal shape, and the engaging member 12 has a substantially L-shaped shape as an example. However, the shapes of the rocking member 10 and the engaging member 12 are It is not limited to this. The shapes of the swinging member 10 and the engagement member 12 may be appropriately set according to the design.

  Although the embodiment in which the motor 7 is a three-phase motor has been described by way of example in the above embodiment, the form of the motor is not limited to this.

  DESCRIPTION OF SYMBOLS 1 parking lock mechanism, 3 ... lock part, 5 ... control part, 7 ... motor, 9 ... control part, 10 ... rocking member, 12 ... engaging member, 14 ... 1st control member (control part).

Claims (4)

It has a swinging member provided swingably around a shaft, and an engaging member provided integrally with the swinging member and provided to be able to engage with the gear by the swinging of the swinging member. The lock and
A restricting portion which abuts on the rocking member at a position where the engaging member engages with the gear to restrict rocking of the rocking member;
A motor for swinging the swinging member;
A control unit that controls driving of the motor;
The control unit controls the drive of the motor so that the engaging member engages with the gear to swing the swinging member in one direction, and the swinging member and the restricting portion are in contact with each other. A parking lock mechanism for stopping the drive of the motor and controlling the drive of the motor such that the swing member swings in the one direction when a predetermined time has elapsed from the stop;   The control unit sets a current value for driving the motor when the predetermined time has elapsed, and a current value for driving the motor when bringing the swing member into contact with the regulating unit. The parking lock mechanism according to claim 1. The motor is a three phase motor,
3. The parking lock mechanism according to claim 1, wherein the control unit supplies a current to one of three phases when driving the motor when the predetermined time has elapsed. 4. It has a swinging member provided swingably around a shaft, and an engaging member provided integrally with the swinging member and provided to be able to engage with the gear by the swinging of the swinging member. The lock and
A restricting portion which abuts on the rocking member at a position where the engaging member engages with the gear to restrict rocking of the rocking member;
A motor for swinging the swinging member;
And a control unit for controlling the driving of the motor.
The control unit controls the drive of the motor so that the engaging member is engaged with the gear to swing the swinging member in one direction, and the swinging member and the restricting portion are in contact with each other. In the parking lock method, the drive of the motor is stopped and the drive of the motor is controlled such that the swing member swings in the one direction when a predetermined time has elapsed from the stop.

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