JP2020175739A - Parking device - Google Patents

Abstract

To provide a parking device which can achieve downsizing and simplification of a structure.SOLUTION: A parking device 1 according to one aspect of the invention includes: a shaft 22 which is configured so as to be rotatable around an axis; a rotor 23 which is fixed to the shaft 22, integrally rotates with the shaft 22, and has a lock hole 73 opening to the axial outer side; and a lock mechanism 11 having a lock pin 114 which enters into the lock hole 73 and may move between a lock position, at which the lock pin 114 restricts rotation of the rotor 23, and a lock release position, at which the lock pin 114 retreats from the lock hole 73 to allow the rotation of the rotor 23, in an axial direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a parking device.

In an electric vehicle such as a hybrid vehicle, a traveling motor is used as a driving source when the vehicle is traveling. Therefore, the electric vehicle is equipped with a parking device that regulates the rotation of the shaft directly connected to the wheel when the shift position is in the P (parking) range.

For example, Patent Document 1 below discloses a configuration including a parking gear provided on an output shaft of a transmission and a parking pole that can be engaged in and disengaged from the parking gear. According to this configuration, the engagement and disengagement of the parking pole and the parking gear are switched by moving the parking pole by driving the actuator.

Japanese Unexamined Patent Publication No. 2000-8552

However, in the prior art, since it is necessary to provide a parking gear and a parking pole separately from the traveling motor, there is a problem that the device becomes large and the configuration becomes complicated.

An object of the present invention is to provide a parking device capable of downsizing and simplifying the configuration.

(1) In order to achieve the above object, the parking device according to one aspect of the present invention (for example, the parking device 1 in the embodiment) is configured to be rotatable around an axis (for example, the axis O in the embodiment). A rotor having a shaft (for example, the shaft 22 in the embodiment) and a hole portion (for example, the lock hole 73 in the embodiment) which is fixed to the shaft and rotates integrally with the shaft and opens outward in the axial direction. (For example, the rotor 23 in the embodiment), the lock position that enters the hole portion and restricts the rotation of the rotor, and the unlock position that retracts from the hole portion and allows the rotation of the rotor. It includes a locking mechanism (eg, locking mechanism 11 in the embodiment) having a locking pin (eg, the locking pin 114 in the embodiment) that is movable in the axial direction.

(2) The parking device according to the aspect (1) above includes a control unit (for example, the control unit 150 in the embodiment) that controls the movement of the lock pin, and the control unit has a rotation speed of the rotor of the rotor. The lock pin may be moved toward the lock position when the speed is 1 speed (for example, the first speed V1 in the embodiment) or less.

(3) The parking device according to the aspect (2) may include a pin position detecting unit (for example, a pin position detecting unit 126 in the embodiment) that detects the position of the lock pin in the axial direction.

(4) The parking device according to the aspect (3) above includes a rotation position detection unit (for example, a rotation position detection unit 161 in the embodiment) for detecting the rotation position of the rotor, and the control unit is the rotor. When the rotation speed becomes equal to or lower than the first speed, the operation start timing to the lock position may be set according to the relative position of the lock pin and the hole portion in the circumferential direction around the axis.

(5) In the parking device according to any one of the above (4), when the control unit determines that the lock pin is not in the lock position while the rotation of the rotor is stopped, the control unit determines that the lock pin is not in the lock position. The rotor may be rotated.

(6) In the parking device according to any one of the above (1) to (5), the lock mechanism moves the lock pin in the axial direction by hydraulic pressure to move an oil supply unit (for example, an oil supply unit in the embodiment). The oil provided with 112) and supplied to the oil supply unit may be cooling oil used for cooling the rotor.

(7) In the parking device according to the aspect (6), the oil supply unit is capable of supplying the cooling oil into the hole portion, and the lock pin is in the lock position according to the hydraulic pressure of the hole portion. May move to the unlocked position.

(8) In the parking device according to the aspect (7), the lock pin may be fitted into the hole at the lock position.

(9) In the parking device according to any one of the above (6) to (8), the oil supply unit may supply the cooling oil to the hole portion even when the rotor is rotating.

(10) In the parking device according to any one of the above (1) to (9), a plurality of the holes are provided at intervals in the circumferential direction around the axis, and the lock pins are provided in the circumferential direction. A plurality of holes may be provided at the same pitch as the pitches of the adjacent holes, or at a pitch that is an integral multiple of positive.

According to the aspect (1) above, the rotation of the rotor itself can be regulated and permitted by the lock pin. That is, by making the traveling motor itself function as a part of the parking device, the device can be downsized and the configuration can be simplified as compared with the conventional case where a parking gear or a parking pole is provided separately from the traveling motor. be able to.

According to the aspect (2) above, the lock pin can be moved to the lock position, for example, when the rotor is at low speed or stopped. As a result, for example, it is possible to prevent the lock pin 114 from suddenly moving toward the lock position during normal traveling of the electric vehicle, so that damage to the lock pin and rotor can be suppressed.

According to the aspect (3) above, by detecting the position of the lock pin, it is possible to accurately determine whether the lock pin is in the lock position or the unlock position. Therefore, the operation reliability can be improved.

According to the aspect (4) above, the lock pin can easily enter the hole. In particular, since the moving speed of the lock pin can be maintained constant, control can be simplified.

According to the aspect (5) above, even after the rotor is temporarily stopped, the hole portion and the lock pin can be aligned with each other, so that the lock pin can be reliably moved to the lock position. Therefore, the operation reliability can be improved.

According to the aspect (6) above, since it is not necessary to separately provide a drive source for the lock pin, it is possible to reduce the cost and simplify the configuration.

According to the aspect (7) above, the lock pin can be efficiently moved to the unlocked position as compared with a configuration in which the lock pin is pulled back to the unlocked position by hydraulic pressure, for example.

According to the aspect (8) above, at the lock position, the gap between the outer peripheral surface of the lock pin and the inner peripheral surface of the hole can be reduced, so that hydraulic pressure is efficiently supplied to the hole during the unlocking operation. Can be generated.

According to the aspect (9) above, the hole can be used as a cooling flow path for the rotor. As a result, the configuration can be simplified and the layout can be improved as compared with the case where the hole portion and the cooling flow path are separately provided.

According to the aspect (10) above, for example, even if one of a plurality of lock pins is damaged, the lock operation can be performed by the remaining lock pins. Therefore, the parking function can be maintained even when the lock pin is damaged.

It is a schematic block diagram of a parking device. It is sectional drawing of the parking device. It is an enlarged sectional view around the traction motor. It is a front view which looked at the rotor from the axial direction. It is a functional block diagram of a parking device. It is a flowchart for demonstrating the lock operation. It is explanatory drawing for demonstrating the alignment operation, and is the sectional view corresponding to FIG. It is a flowchart for demonstrating the unlocking operation. It is explanatory drawing for demonstrating the unlocking operation, and is the sectional view corresponding to FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Parking device]
FIG. 1 is a schematic configuration diagram of the parking device 1.
The parking device 1 shown in FIG. 1 is mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle. The parking device 1 includes a traveling motor 10 and a lock mechanism 11.

<Traveling motor>
FIG. 2 is a cross-sectional view of the parking device 1.
As shown in FIG. 2, the traveling motor 10 is connected to, for example, a wheel axle (wheel drive axle) via a speed reducer or the like. The traveling motor 10 includes a stator (not shown), a shaft 22, and a rotor 23. In the following description, the direction along the axis O of the shaft 22 is simply referred to as the axial direction, the direction intersecting the axis O in the front view from the axial direction is referred to as the radial direction, and the direction orbiting around the axis O is the circumferential direction. That is.

FIG. 3 is an enlarged cross-sectional view of the periphery of the traveling motor 10 including the lock mechanism 11.
As shown in FIG. 3, the traveling motor 10 is housed in the housing 24. Cooling oil (not shown) is housed in the housing 24. As the cooling oil, ATF (Automatic Transmission Fluid) or the like, which is a hydraulic oil used for lubrication of a transmission, power transmission, or the like, is preferably used.

In the housing 24 of the present embodiment, a bearing housing 32 that axially penetrates both side walls 31 is formed on both side walls 31 that face each other in the axial direction (only one side wall 31 is shown in FIG. 3). The bearing housing 32 is formed in a tubular shape extending in the axial direction. A bearing 33 is fitted in the bearing housing 32.

The shaft 22 penetrates the inside and outside of the housing 24 in the axial direction. Both ends of the shaft 22 are rotatably supported by the bearing 33 in the bearing housing 32. The shaft 22 is connected to the foot shaft outside the housing 32 via a speed reducer or the like.

As shown in FIG. 2, the shaft 22 is formed with a shaft flow path 35 through which cooling oil flows. The shaft flow path 35 has an axial center flow path 41 and a radial flow path 42.
The axial center flow path 41 penetrates the shaft 22 coaxially with the axis O.
The radial flow path 42 is provided at the central portion of the shaft 22 in the axial direction. The radial flow path 42 penetrates the shaft 22 in the radial direction and communicates with the inside and outside of the axial center flow path 41 in the radial direction. In the present embodiment, a plurality of radial flow paths 42 are provided in the circumferential direction.

The rotor 23 is formed in a tubular shape arranged coaxially with the axis O. The rotor 23 is fixed to the shaft 22 so that it can rotate integrally with the shaft 22. The rotor 23 of the present embodiment is a so-called SPM (Surface Permanent Magnet) type rotor 23 in which a permanent magnet 53 is arranged on the outer peripheral surfaces of the rotor cores 51 and 52. However, the rotor 23 may be of a so-called IPM (Interior permanent Magnet) type in which the permanent magnets 53 are provided inside the rotor cores 51 and 52.

The rotor 23 includes a first rotor core 51 and a second rotor core 52, a permanent magnet 53, a filament winding layer 54, an oil pass plate 55, a first end face plate 56, and a second end face plate 57. ..

The first rotor core 51 and the second rotor core 52 are each formed in a tubular shape in which, for example, electromagnetic steel plates are vertically laminated. The shafts 22 of the rotor cores 51 and 52 are press-fitted and fixed at intervals in the axial direction. In the present embodiment, the axial lengths of the rotor cores 51 and 52 are set to be the same.

The first rotor core 51 is formed with a first rotor flow path 61 that penetrates the first rotor core 51 in the axial direction. The second rotor core 52 is formed with a second rotor flow path 62 that penetrates the second rotor core 52 in the axial direction. A plurality of rotor flow paths 61 and 62 are formed at intervals in the circumferential direction in a state of being overlapped when viewed from the axial direction. In the present embodiment, the rotor flow paths 61 and 62 are formed in a circular shape when viewed from the front in the axial direction, respectively. An O-ring 65 is provided on the inner peripheral surface of the first rotor flow path 61 at a portion located at the outer end portion in the axial direction. A plurality of O-rings 65 may be provided at intervals in the axial direction.

A plurality of permanent magnets 53 are arranged in the circumferential direction on the outer peripheral surfaces of the rotor cores 51 and 52. The permanent magnet 53 is, for example, a rare earth magnet. Examples of rare earth magnets include neodymium magnets, samarium-cobalt magnets, and placeodium magnets. The outer peripheral surfaces of the rotor cores 51 and 52 may be provided with recesses or the like for positioning the permanent magnets 53 in the circumferential direction.

The filament winding layer 54 is provided on the outer peripheral portion of the permanent magnet 53. Specifically, the filament winding layer 54 is formed by spirally winding filament fibers obtained by forming a material such as glass fiber or resin into a thread shape along the circumferential direction of the rotor cores 51 and 52. The filament winding layer 54 is wound around the outer peripheral portion of the permanent magnet 53 to fix the permanent magnet 53 to the outer peripheral surfaces of the rotor cores 51 and 52. The filament winding layer 54 may be wound and laminated a plurality of times in the radial direction of the rotor cores 51 and 52.

As shown in FIG. 3, the oil pass plate 55 is formed in an annular shape arranged coaxially with the axis O. The oil pass plate 55 is fixed to the shaft 22 in a state of being sandwiched in the axial direction by the first rotor core 51 and the second rotor core 52. The outer peripheral surface of the oil pass plate 55 is arranged at a position equivalent to the outer peripheral surface of the filament winding layer 54 in the radial direction.

In the oil pass plate 55, an intermediate flow path 68 is defined at the central portion in the axial direction. The intermediate flow path 68 opens on the inner peripheral surface of the oil pass plate 55 and communicates with the above-mentioned radial flow path 42.

A first distribution flow path 69 is formed on an end surface of the oil pass plate 55 facing the first rotor core 51 in the axial direction. The upstream end of the first distribution flow path 69 communicates with the intermediate flow path 68. The downstream end of the first distribution flow path 69 communicates with each of the above-mentioned first rotor flow paths 61.
A second distribution flow path 70 is formed on the end face of the oil pass plate 55 facing the second rotor core 52 in the axial direction. The upstream end of the second distribution flow path 70 communicates with the intermediate flow path 68. The downstream end of the second distribution flow path 70 communicates with each of the above-mentioned second rotor flow paths 62.

The first end face plate 56 is fixed to a portion of the shaft 22 located outside in the axial direction with respect to the first rotor core 51. The first end face plate 56 sandwiches the first rotor core 51 in the axial direction with the oil pass plate 55. In the first end face plate 56, a first discharge hole 71 is formed at the same position in the circumferential direction as the first rotor flow path 61. The front view shape of the first discharge hole 71 is formed in a circular shape like the first rotor flow path 61. The first discharge hole 71 communicates the first rotor flow path 61 to the outside. The first rotor flow path 61 and the first discharge hole 71 form a lock hole 73 that penetrates the first rotor core 51 in the axial direction. At least the outer opening edge in the axial direction of the first discharge hole 71 is formed in a tapered shape.

As shown in FIG. 2, the second end face plate 57 is fixed to a portion of the shaft 22 located outside the second rotor core 52 in the axial direction. The second end face plate 57 axially sandwiches the second rotor core 52 with the oil pass plate 55. In the second end face plate 57, a second discharge hole 72 is formed at the same position in the circumferential direction as the second rotor flow path 62. The front view shape of the second discharge hole 72 is formed in a circular shape like the second rotor flow path 62.

The stator (not shown) is formed in a tubular shape arranged coaxially with the axis O. The stator surrounds the rotor 23 with a radial distance from the outer peripheral surface of the rotor 23. The stator is arranged inside the housing 24 in a state where a part of the stator is immersed in the cooling oil.

<Lock mechanism>
As shown in FIGS. 1 and 3, the lock mechanism 11 regulates the rotation of the rotor 23 when the shift position of the electric vehicle is in the P range. The lock mechanism 11 includes a cylinder 110, a piston 111, and an oil supply unit 112 (see FIG. 1).
As shown in FIG. The cylinder 110 surrounds the bearing housing 32 on one side wall 31 of the housing 32. Specifically, the cylinder 110 is formed in a tubular shape that projects inward in the axial direction from one side wall 31.

The piston 111 includes a piston body 113 and a lock pin 114.
The piston body 113 is formed in an annular shape centered on the axis O. The piston body 113 closes the opening defined by the bearing housing 32 and the cylinder 110. The piston body 113 is configured to be movable in the axial direction according to the cooling oil supplied from the oil supply unit 112. Specifically, the outer peripheral surface of the piston body 113 is slidably fitted to the inner peripheral surface of the cylinder 110 via an O-ring 116. The inner peripheral surface of the piston 111 is slidably fitted to the outer peripheral surface of the bearing housing 32 via an O-ring 117. The space surrounded by one side wall 31, the bearing housing 32, the cylinder 110, and the piston 111 defines a cylinder chamber 115 that expands or contracts as the piston 111 moves.

The lock pin 114 is provided on the surface of the piston body 113 facing inward in the axial direction (hereinafter, referred to as an inner surface) in a state of projecting inward in the axial direction. The lock pin 114 is configured to be able to advance and retreat into the lock hole 73 as the piston body 113 moves. Specifically, the piston 111 has a lock position (see FIG. 3) in which the lock pin 114 enters the lock hole 73 to restrict the rotation of the rotor 23 with respect to the lock pin 114, and the lock pin 114 retracts from the lock hole 73. The rotor 23 moves axially between the unlocked position (see FIG. 2) that allows the rotor 23 to rotate with respect to the lock pin 114.

The lock pin 114 includes an urging member 120 and an engaging portion 121. The urging member 120 is provided on the inner surface of the piston body 113 so as to be expandable and contractible in the axial direction.

The engaging portion 121 is provided at the tip end portion (inner end portion in the radial direction) of the urging member 120 in a state of projecting inward in the axial direction. The engaging portion 121 is formed in a columnar shape extending along the axial direction. Specifically, the engaging portion 121 includes a fitting portion 121a and an approaching portion 121b.
The fitting portion 121a has a uniform outer diameter. In the present embodiment, the outer diameter of the fitting portion 121a is slightly smaller than the inner diameter (minimum inner diameter portion) of the lock hole 73. The fitting portion 121a is fitted in the lock hole 73 when the piston 111 is in the locked position. In the present embodiment, the fitting portion 121a is in close contact with the inner surface of the lock hole 73 via the O-ring 65.

The approach portion 121b is connected to the tip end portion of the fitting portion 121a. The tip surface of the approach portion 121b is formed in a hemispherical shape that is convex inward in the axial direction. The approach portion 121b may be formed in a tapered shape that gradually tapers toward the inside in the axial direction.

FIG. 4 is a front view of the rotor 23 as viewed from the axial direction.
As shown in FIG. 4, a plurality of the above-mentioned lock pins 114 are formed in the piston main body 113 at intervals in the circumferential direction. In this embodiment, the number of lock pins 114 is the same as that of the lock holes 73. In this case, the pitch (distance in the circumferential direction) of the lock pins 114 is set to the same pitch as the lock holes 73. The number of lock pins 114 may be smaller than the number of lock holes 73. In this case, the pitch of the lock pin 114 is preferably set to a positive integer multiple of the pitch of the lock hole 73. Further, the lock pin 114 may have a guide cylinder or the like that surrounds the urging member 120 and the engaging portion 121 and guides the deformation of the urging member 120 and the movement of the engaging portion 121.

As shown in FIG. 2, the lock mechanism 11 of the present embodiment includes a pin position detecting unit 126 that detects the axial position of the engaging unit 121. The pin position detection unit 126 is, for example, a magnetic sensor. However, the pin position detection unit 126 may use a sensor other than the magnetic sensor.

As shown in FIG. 1, the oil supply unit 112 includes a pump 130, a supply flow path 131, and a discharge flow path 132.
The pump 130 is configured so that, for example, the cooling oil stored in the housing 24 can be pumped up and supplied into the traveling motor 10 and the cylinder chamber 115.

The supply flow path 131 includes a main flow path 135, a motor supply path 136, and a cylinder supply path 137.
The upstream end of the main flow path 135 is connected to the pump 130.

The motor supply path 136 connects the main flow path 135 and the traveling motor 10. Specifically, the downstream end of the motor supply path 136 is connected to the axial center flow path 41 described above. A motor on-off valve 138 is provided on the motor supply path 136. The motor on-off valve 138 adjusts the flow rate of the cooling oil flowing in the motor supply path 136.
The cylinder supply path 137 connects the main flow path 135 and the inside of the cylinder chamber 115. Specifically, the downstream end of the cylinder supply path 137 is connected to the cylinder chamber 115 through a supply hole (not shown) that communicates inside and outside the cylinder chamber 115. A cylinder on-off valve 139 is provided on the cylinder supply path 137. The cylinder on-off valve 139 adjusts the flow rate of the cooling oil flowing in the cylinder supply path 137.

The discharge flow path 132 is connected to the inside of the cylinder chamber 115 through a discharge hole (not shown) that communicates the inside and outside of the cylinder chamber 115. A discharge valve 140 is provided on the discharge flow path 132. The discharge valve 140 adjusts the flow rate of the cooling oil flowing in the discharge flow path 132.

The oil supply unit 112 of the present embodiment always constitutes cooling oil in the traveling motor 10 when the traveling motor 10 is rotating (when the electric vehicle is traveling). Specifically, when the electric vehicle is traveling, the cooling oil is sent out by the pump 130 with the motor on-off valve 138 opened, the cylinder on-off valve 139 closed, and the discharge valve 140 opened.

The cooling oil delivered by the pump 130 passes through the main flow path 135 and then flows into the motor supply path 136. The cooling oil flows into the shaft center flow path 41 after flowing through the motor supply path 136. The refrigerant flowing in the axial center flow path 41 flows into the intermediate flow path 68 through the radial flow path 42, and then flows into the lock hole 73 through the first distribution flow path 69. The cooling oil that has flowed into the lock hole 73 is discharged to the outside of the rotor 23 through the outer opening in the axial direction. The cooling oil discharged to the outside of the rotor 23 is returned to the inside of the housing 24.

<Control unit>
FIG. 5 is a functional block diagram of the parking device 1.
The parking device 1 of the present embodiment includes a control unit 150 that comprehensively controls the operation of the lock mechanism 11 described above. The control unit 150 is mounted on, for example, an ECU (Electronic Control Unit) of an electric vehicle. The control unit 150 realizes a functional unit of each component by, for example, a processor such as a CPU (Central Processing Unit) executes a program (software) stored in the storage unit.

The control unit 150 of the present embodiment includes a range acquisition unit 151, a pin position acquisition unit 152, a rotation position acquisition unit 153, a determination unit 154, and a drive control unit 155.
The range acquisition unit 151 acquires a range signal transmitted from the range switch 160 provided in the electric vehicle. The range switch 160 is operated, for example, when the occupant changes the shift position. That is, the range signal contains information about the shift position.

The pin position acquisition unit 152 acquires a pin position signal transmitted from the pin position detection unit 126.
The rotation position acquisition unit 153 acquires a rotation position signal transmitted from the rotation position detection unit 161 provided in the traveling motor 10. The rotation position detection unit 161 is, for example, a resolver or the like, and detects the rotation angle and the rotation speed Va of the rotor 23. That is, the rotation position signal includes information on the rotation angle and the rotation speed Va of the rotor 23.

The determination unit 154 determines the shift position, the rotor 23, and the lock pin 114 based on the signals received by the acquisition units 151 to 153 described above.
For example, the determination unit 154 determines whether or not an input command to the P range has been issued, and whether or not an input command has been issued from the P range to another range (for example, the D range) based on the range signal.
The determination unit 154 determines whether the piston 111 (lock pin 114) is in the lock position or the unlock position based on the pin position signal.
Based on the rotation position signal, the determination unit 154 determines whether or not the rotation speed Va of the rotor 23 is equal to or less than the first speed V1 and whether or not the rotation of the rotor 23 is stopped (rotation speed Va is 0s ^-1 ). judge.

The drive control unit 155 operates the rotor 23 and the lock mechanism 11 based on the information acquired by each acquisition unit 151 to 153 and the determination result of the determination unit 154.
For example, the drive control unit 155 moves the lock pin 114 toward the lock position when the following conditions are satisfied (lock operation).
(1) An input command to the P range has been issued.
(2) The rotation speed Va of the rotor 23 is equal to or less than the first speed V1.

After the lock operation, the drive control unit 155 rotates the rotor 23 by a predetermined amount when the following conditions are satisfied (alignment operation).
(1) After the lock operation is started, the rotation of the rotor 23 is stopped (a predetermined time has elapsed).
(2) The lock pin 114 is in the unlocked position.

The drive control unit 155 moves the lock pin 114 toward the unlock position (unlock operation) when the following conditions are satisfied.
(1) The lock pin 114 is in the locked position.
(2) An input command was given to a range other than the P range.

The drive control unit 155 sets the operation start timing of the piston 111 based on the rotation position (position of the lock hole 73) of the rotor 23 obtained by the rotation position acquisition unit 153 and the rotation speed of the rotor 23. In this embodiment, the moving speed of the piston 111 (the output of the pump 130) is constant. Then, the drive control unit 155 determines the lock hole 73 at the timing when the tip end portion of the lock pin 114 intersects the first end face plate 56 based on the relative position of the lock pin 114 and the lock hole 73 in the circumferential direction and the rotation speed of the rotor 23. The operation start timing of the piston 111 is set so that the lock pin 114 and the lock pin 114 overlap each other in the front view.

[How to operate the parking device]
Next, the operation method of the parking device 1 described above will be described.
<Transition from unlocked position to locked position>
First, a case of shifting from the unlocked position to the locked position will be described based on the flowchart shown in FIG. In the following description, a state in which the lock pin 114 is in the unlocked position will be described as an initial state.
As shown in FIG. 6, in step S1, it is determined whether or not the input operation to the P range has been performed by operating the range switch 160.

If the determination result in step S1 is "NO", step S1 is repeated.
If the determination result in step S1 is "YES", it is determined that the input operation to the P range has been performed, and the process proceeds to step S2.

In step S2, it is determined whether or not the rotation speed Va of the rotor 23 is equal to or less than the first speed V1.

If the determination result in step S2 is "NO", it is determined that the rotor 23 has not yet decelerated, and step S2 is repeated.
If the determination result in step S2 is "YES", it is determined that the rotor 23 has decelerated to a speed at which the lock pin 114 can enter the lock hole 73, and the process proceeds to step S3.

In step S3, the lock operation is performed. In the locking operation, by supplying cooling oil into the cylinder chamber 115, the piston 111 is moved to the locked position by the hydraulic pressure in the cylinder chamber 115. Specifically, the drive control unit 155 closes the motor on-off valve 138 shown in FIG. 1, opens the cylinder on-off valve 139, and closes the discharge valve 140. Then, the drive control unit 155 outputs an operation signal to the pump 130 in accordance with the operation start timing of the piston 111. As a result, the pump 130 starts delivering the coolant.

As shown by the solid arrow in FIG. 1, the cooling oil delivered by the pump 130 flows into the cylinder supply path 137 after passing through the main flow path 135. The cooling oil flows into the cylinder chamber 115 after flowing through the cylinder supply path 137.

As shown in FIGS. 2 and 3, when the cooling oil flows into the cylinder chamber 115, the hydraulic pressure in the cylinder chamber 115 rises. As a result, the piston 111 moves inward in the axial direction while sliding on the inner peripheral surface of the cylinder 110 and the outer peripheral surface of the bearing housing 32. After that, each lock pin 114 enters the corresponding lock hole 73.

As shown in FIG. 6, in step S4, it is determined whether or not the lock pin 114 is in the locked position.
If the determination result in step S4 is "YES", it is determined that the lock pin 114 has reached the lock position. That is, when the lock pin 114 enters the lock hole 73, the rotation of the rotor 23 is restricted. In this case, this routine ends.

FIG. 7 is an explanatory view for explaining the alignment operation, and is a cross-sectional view corresponding to FIG.
If the determination result in step S4 is "NO", it is determined that the lock pin 114 has not yet reached the lock position, and the process proceeds to step S5. In this case, as shown in FIGS. 4 and 7, the tip of the lock pin 114 is on the outer end surface in the axial direction of the first end face plate 56 with the lock pin 114 and the lock hole 73 displaced in the circumferential direction. It is possible that they are in contact with each other. In this state, when the hydraulic pressure in the cylinder chamber 115 further rises, the urging member 120 elastically deforms, so that only the piston body 113 moves inward in the axial direction with respect to the engaging portion 121. As a result, it is possible to prevent the engaging portion 121 from being excessively pressed against the first end face plate 56.

In step S5, it is determined whether or not the rotation of the rotor 23 is stopped.
If the determination result in step S5 is "NO", the process returns to step S4. That is, when the rotor 23 is still rotating, there is a possibility that the distal positions of the lock pin 114 and the lock hole 73 coincide with each other after the tip of the lock pin 114 slides on the first end face plate 56. is there. When the circumferential positions of the lock pin 114 and the lock hole 73 match, the lock pin 114 moves again toward the lock position by the hydraulic pressure in the cylinder chamber 115 or the restoring force of the urging member 120. As a result, the lock pin 114 enters the lock hole 73.

If the determination result in step S5 is "YES", it is determined that the rotation of the rotor 23 has stopped, and the process proceeds to step S6.

In step S6, the rotor 23 is rotated to align the lock hole 73 and the lock pin 114. The rotation speed Va at this time is preferably set to the second speed V2, which is slower than the first speed V1. As the rotor 23 rotates at the second speed V2, the positions of the lock pin 114 and the lock hole 73 in the circumferential direction coincide with each other after a lapse of a predetermined time. Then, the lock pin 114 moves again toward the lock position by the hydraulic pressure in the cylinder chamber 115 or the restoring force of the urging member 120. As a result, the lock pin 114 enters the lock hole 73. After that, when the determination result in step S4 becomes "YES", this routine ends.

<Transition from unlocked position to locked position>
Next, the case of shifting from the locked position to the unlocked position will be described with reference to the flowchart shown in FIG. In the following description, a state in which the lock pin 114 is in the locked position will be described as an initial state.
As shown in FIG. 8, in step S11, it is determined whether or not an input operation to a range other than the P range has been performed by operating the range switch 160.

If the determination result in step S11 is "NO", step S11 is repeated.
If the determination result in step S11 is "YES", the process proceeds to step S12.

In step S12, the unlock operation is performed. In the unlocking operation, the cooling oil is supplied into the lock hole 73 and the cooling oil is discharged from the cylinder chamber 115 to move the piston 111 to the unlocked position by the hydraulic pressure in the lock hole 73. Specifically, as shown by the broken line arrow in FIG. 1, the cooling oil is delivered by the pump 130 in a state where the motor on-off valve 138 is opened, the cylinder on-off valve 139 is closed, and the discharge valve 140 is opened. To do.

The cooling oil delivered by the pump 130 passes through the main flow path 135 and then flows into the motor supply path 136. The cooling oil flows into the shaft center flow path 41 after flowing through the motor supply path 136.

FIG. 9 is an explanatory view for explaining the unlocking operation, and is a cross-sectional view corresponding to FIG.
As shown in FIG. 9, the refrigerant flowing in the axial center flow path 41 flows into the intermediate flow path 68 through the radial flow path 42, and then flows into the lock hole 73 through the first distribution flow path 69. When the cooling oil flows into the lock hole 73, the hydraulic pressure in the lock hole 73 rises. As a result, the lock pin 114 is pushed back so as to retract from the lock hole 73. When the lock pin 114 is pushed back toward the unlocked position, the hydraulic pressure in the cylinder chamber 115 rises. Then, the cooling oil in the cylinder chamber 115 is discharged through the discharge flow path 132. As a result, as the hydraulic pressure of the lock hole 73 rises, the piston 111 moves outward in the axial direction while sliding on the inner peripheral surface of the cylinder 110 and the outer peripheral surface of the bearing housing 32. As a result, the lock pin 114 retracts from the lock hole 73. The cooling oil discharged through the discharge flow path 132 is returned to the housing 24.

In step S13, it is determined whether or not the lock pin 114 is in the unlocked position.
If the determination result in step S13 is "NO", it is determined that the lock pin 114 has not yet reached the unlocked position, and step S14 is repeated.
If the determination result in step S13 is "YES", it is determined that the lock pin 114 has reached the unlocked position. That is, when the lock pin 114 retracts from the inside of the lock hole 73, the rotation of the rotor 23 is allowed.
This completes this routine.

As described above, in the present embodiment, the lock mechanism 11 for switching the rotation and stop of the rotor 23 by moving back and forth in the lock hole 73 formed in the rotor 23 is provided.
According to this configuration, the lock pin 114 can regulate and allow the rotation of the rotor 23 itself. That is, by making the traveling motor 10 itself function as a part of the parking device 1, the device can be downsized and the configuration can be simplified as compared with the conventional case where the parking gear and the parking pole are provided separately from the traveling motor. Can be planned.

In the present embodiment, the lock pin 114 moves toward the lock position when the rotation speed Va of the rotor 23 is equal to or less than the first speed V1.
According to this configuration, for example, the lock pin 114 can be moved to the lock position while the rotor 23 is at low speed or stopped. As a result, for example, it is possible to prevent the lock pin 114 from suddenly moving toward the lock position during normal traveling of the electric vehicle, so that damage to the lock pin 114 and the rotor 23 can be suppressed.

In the present embodiment, the pin position detecting unit 126 for detecting the axial position of the lock pin 114 is provided.
According to this configuration, by detecting the position of the lock pin 114, it is possible to accurately determine whether the lock pin 114 is in the lock position or the unlock position. Therefore, the operation reliability can be improved.

In the present embodiment, the rotor 23 is rotated at the second rotation speed V2 when it is determined that the lock pin 114 is not in the locked position while the rotation of the rotor 23 is stopped.
According to this configuration, the lock hole 73 and the lock pin 114 can be aligned even after the rotor is temporarily stopped, so that the lock pin 114 can be reliably moved to the lock position. Therefore, the operation reliability can be improved.

In the present embodiment, the operation start timing of the piston 111 is set based on the rotation position of the rotor 23 (the position of the lock hole 73) and the rotation speed of the rotor 23.
According to this configuration, the lock pin 114 can easily enter the lock hole 73. In particular, since the moving speed of the piston 111 can be maintained constant, control can be simplified.

In the present embodiment, the lock pin 114 is moved by using the cooling oil used for cooling the rotor 23.
According to this configuration, it is not necessary to separately provide a drive source for the lock pin 114, so that cost reduction and simplification of the configuration can be achieved.

In the present embodiment, in the unlocking operation, the lock pin 114 is moved to the unlocking position according to the hydraulic pressure in the lock hole 73.
According to this configuration, for example, the lock pin 114 can be efficiently moved to the unlocked position as compared with the configuration in which the lock pin 114 is pulled back by hydraulic pressure.

In the present embodiment, the lock pin 114 is fitted in the lock hole 73 at the lock position.
According to this configuration, the gap between the outer peripheral surface of the lock pin 114 and the inner peripheral surface of the lock hole 73 can be reduced at the lock position, so that the hydraulic pressure in the lock hole 73 can be efficiently reduced during the unlock operation. Can be generated.

In the present embodiment, the lock hole 73 is configured to supply cooling oil even when the rotor 23 is rotating.
According to this configuration, the lock hole 73 can be used as a cooling flow path for the rotor 23. As a result, the configuration can be simplified and the layout can be improved as compared with the case where the lock hole 73 and the cooling flow path are separately provided.

In the present embodiment, a plurality of lock pins 114 and a plurality of lock holes 73 are provided.
According to this configuration, for example, even if one of the plurality of lock pins 114 is damaged, the lock operation can be performed by the remaining lock pins 114. Therefore, the parking function can be maintained even when the lock pin 114 is damaged.

(Other variants)
Although preferable examples of the present invention have been described above, the present invention is not limited to these examples. Configurations can be added, omitted, replaced, and other modifications without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the appended claims.
For example, in the above-described embodiment, the configuration in which the rotor cooling flow path (first rotor flow path 61 and first discharge hole 71) functions as the lock hole 73 has been described, but the configuration is not limited to this configuration. For example, a flux barrier provided to suppress the leakage flux may be used for the lock hole. Further, the lock hole 73 is not limited to the case where it is also used for other functions, and may be provided separately. In this case, the lock hole 73 is not limited to the configuration that penetrates the first rotor core 51, and may be a configuration that allows the lock pin 114 to enter.
In the above-described embodiment, the case where the front view shapes of the lock hole 73 and the lock pin 114 are formed in a circular shape is described, but the present invention is not limited to this configuration. For example, the front view shape of the lock hole 73 and the lock pin 114 may be formed in a triangular system shape or a rectangular shape. Further, the front view shapes of the lock hole 73 and the lock pin 114 may be different from each other.

In the above-described embodiment, the configuration in which the lock pin 114 is moved by switching the hydraulic pressure generation source (inside the cylinder chamber 115 and the lock hole 73) with respect to one pump 130 has been described, but the configuration is not limited to this configuration. For example, the lock pin 114 may be moved by increasing or decreasing the hydraulic pressure of the cylinder chamber 115 by the supply pump and the discharge pump.
In the above-described embodiment, the configuration in which the lock pin 114 is moved by hydraulic pressure has been described, but the configuration is not limited to this configuration. For example, the lock pin 114 may be moved by using a magnetic force such as a solenoid mechanism or a ball screw mechanism or the like. Further, the oil supply unit 112 may be provided separately from the cooling of the traveling motor 10.

In the above-described embodiment, the configuration for setting the operation start timing of the lock pin 114 after keeping the moving speed of the lock pin 114 constant has been described, but the present invention is not limited to this configuration. For example, the moving speed of the lock pin 114 may be adjusted according to the rotation position of the rotor 23 or the like. Further, the lock pin 114 may be moved after the rotor 23 is stopped.
In the above-described embodiment, the configuration in which the lock pin 114 is fitted in the lock hole 73 has been described, but the configuration is not limited to this configuration. For example, the lock pin 114 may be inserted into the lock hole 73 with a gap.

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-mentioned modified examples may be appropriately combined.

1 ... Parking device 11 ... Lock mechanism 22 ... Shaft 23 ... Rotor 73 ... Lock hole (hole)
112 ... Oil supply unit 114 ... Lock pin 126 ... Pin position detection unit 150 ... Control unit 161 ... Rotational position detection unit

Claims (10)

A shaft configured to rotate around the axis and
A rotor that is fixed to the shaft, rotates integrally with the shaft, and has a hole that opens outward in the axial direction.
A lock having a lock pin that can move in the axial direction between a lock position that enters the hole and restricts the rotation of the rotor and an unlock position that retracts from the hole and allows the rotor to rotate. A parking device equipped with a mechanism. A control unit for controlling the movement of the lock pin is provided.
The parking device according to claim 1, wherein the control unit moves the lock pin toward the lock position when the rotation speed of the rotor is equal to or lower than the first speed. The parking device according to claim 2, further comprising a pin position detecting unit for detecting the position of the lock pin in the axial direction. A rotation position detection unit for detecting the rotation position of the rotor is provided.
When the rotation speed of the rotor becomes equal to or lower than the first speed, the control unit starts operating to the lock position according to the relative position of the lock pin and the hole in the circumferential direction around the axis. The parking device according to claim 3, wherein the timing is set. The parking device according to claim 4, wherein the control unit rotates the rotor when it determines that the lock pin is not in the locked position while the rotation of the rotor is stopped. The lock mechanism includes an oil supply unit that hydraulically moves the lock pin in the axial direction.
The parking device according to any one of claims 1 to 5, wherein the oil supplied to the oil supply unit is cooling oil used for cooling the rotor. The oil supply unit is capable of supplying the cooling oil into the hole portion.
The parking device according to claim 6, wherein the lock pin moves from the lock position to the unlock position according to the hydraulic pressure of the hole. The parking device according to claim 7, wherein the lock pin is fitted into the hole at the lock position. The parking device according to any one of claims 6 to 8, wherein the oil supply unit supplies the cooling oil to the hole even when the rotor is rotating. A plurality of the holes are provided at intervals in the circumferential direction around the axis.
The parking device according to any one of claims 1 to 9, wherein a plurality of the lock pins are provided at the same pitch as the pitches of the holes adjacent to each other in the circumferential direction or at a pitch of an integral multiple of positive. ..

Images