JP2010269682A - Parking device - Google Patents

Abstract

To provide a parking device with improved assemblability.
A parking device includes a parking gear that rotates in conjunction with a motor, and includes a parking lock pawl that is engaged with the parking gear and is rotatably supported. The first gear 40 connected to the rotor 20, the second gear 50 that meshes with the first gear 40 and rotates in conjunction with the parking gear 60, and the parking lock pole 70 abuts to rotate the parking lock pole 70. A cogging torque rotational speed of the motor 30 is Ncg, the number of teeth of the parking gear 60 is Np, the number of teeth of the first gear 40 is Ndv, and the number of teeth of the second gear 50 is Ndn. , Ncg / Np = Ndv / Ndn so that the parking gear 60 and the par In ring pawl 70 and engages position, the parking gear 60 is stopped.
[Selection] Figure 3

Description

  The present invention relates to a relationship between a gear connected to a rotor meshing with a parking gear and cogging torque.

  A vehicle such as a hybrid car is a mechanism that serves as a stopper for a parking gear provided on any rotating shaft that rotates at a constant reduction ratio with respect to a drive shaft axis (tire axis), similarly to AT cars and CVT cars. The system that stops the movement of the car by meshing is adopted. In a hybrid car equipped with a motor for driving purposes, the motor rotor shaft also rotates at a constant reduction ratio with respect to the drive shaft shaft.

Patent Document 1 discloses a technique regarding a parking mechanism of an automatic transmission.
The ends of the parking pole are rotatably supported by the case and the side cover, and the parking pole is rotated by a rod that moves freely from the case. The rod is formed with a projecting engagement portion and engages with the parking gear.
The rotation of the rotor can be restricted by the engagement of the parking pole and the parking gear.

Regarding motor-related technologies, there are the following.
Patent Document 2 discloses a technique regarding a DC motor control device and a recording device.
The motor cogging torque information is stored in the nonvolatile memory of the motor controller, and the motor is stopped at a predetermined position based on the motor speed information and cogging phase information. For stopping the rotor, auxiliary electromagnetic means are used, and a large braking torque can be obtained.
Patent Document 3 discloses a technique relating to a structure for preventing rotation at rest of an electric motor.
In Patent Document 3, as in Patent Document 2, the rotor is stopped at a predetermined position using information on cogging torque.

JP-A-6-78132 JP 2005-132029 A JP 2007-174850 A

However, Patent Document 1 is considered to have the following problems.
In an automobile such as a hybrid car, the parking gear is housed in a gear case as shown in Patent Document 1.
Since the gear case is narrow and the parking brake and the parking gear interfere with each other, it is difficult to assemble.

  On the other hand, since it is linked to the movement of the rotor, it is affected by the cogging torque of the motor, but it does not stop only the motor, so it is stopped by a method using magnetic force as in Patent Document 2 and Patent Document 3. It is also difficult.

  Accordingly, an object of the present invention is to provide a parking apparatus with improved assemblability in order to solve such problems.

In order to achieve the above object, a parking apparatus according to the present invention has the following characteristics.
(1) In a parking device that includes a parking gear that rotates in conjunction with a motor and is used in a drive mechanism,
A parking lock pole that meshes with the parking gear and is rotatably supported, a first gear connected to a rotor of the motor, and a parking rod that abuts the parking lock pole and rotates the parking lock pole. And the gear ratio between the parking gear and the first gear is determined based on the cogging torque rotational speed of the motor, and the parking gear and the parking lock pole are engaged with each other, The parking gear is stopped.

(2) In the parking device according to (1),
A second gear that meshes with the first gear and rotates in conjunction with the parking gear is provided. The motor has a cogging torque rotational speed of Ncg, the parking gear has a number of teeth Np, and the first gear has a number of teeth. Ndv, where the number of teeth of the second gear is Ndn, Ncg / Np = Ndv / Ndn.

(3) In the parking device according to (1),
The first gear is connected to the motor and is configured to rotate in conjunction with the parking gear. The cogging torque rotation speed of the motor is Ncg, the number of teeth of the parking gear is Np, and the integer is L. , L × Ncg = Np.

With the parking device according to the present invention having such characteristics, the following operations and effects can be obtained.
The invention described in (1) above includes a parking gear that rotates in conjunction with a motor, and in a parking device that is used in a drive mechanism, a parking lock pole that meshes with the parking gear and is rotatably supported, A first gear connected to the rotor having a parking rod that contacts the parking lock pole and rotates the parking lock pole; and a gear ratio between the parking gear and the first gear is included in the motor. The parking gear is determined based on the cogging torque rotation speed, and the parking gear stops at a position where the parking gear and the parking lock pole mesh with each other.

Since the gear ratio between the parking gear and the first gear is determined based on the cogging torque rotation speed, the parking lock pawl meshes with the stationary position of the parking gear corresponding to the stationary position of the rotor in relation to the cogging phase. It will be.
Therefore, when the parking lock pole is assembled, the parking lock pole and the parking gear or the parking rod can be assembled without interference. For this reason, it becomes possible to implement | achieve the structure which improved the assembly | attachment property of the parking apparatus.

  The invention described in (2) above is the parking device described in (1), further including a second gear that meshes with the first gear and rotates in conjunction with the parking gear, and the motor has a cogging torque rotational speed. Is Ncg, the number of teeth of the parking gear is Np, the number of teeth of the first gear is Ndv, and the number of teeth of the second gear is Ndn, Ncg / Np = Ndv / Ndn. .

The cogging torque rotation speed (Ncg), the number of teeth of the parking gear (Np), the number of teeth of the first gear (Ndv), and the number of teeth of the second gear (Ndn) shall be Ncg / Np = Ndv / Ndn. Thus, the parking lock pawl is engaged with the stationary position of the parking gear corresponding to the stationary position of the rotor in relation to the cogging phase.
Therefore, when the parking lock pole is assembled, the parking lock pole and the parking gear or the parking rod can be assembled without interference. For this reason, it becomes possible to implement | achieve the structure which improved the assembly | attachment property of the parking apparatus.

  The invention described in (3) above is the parking device described in (1), wherein the first gear is configured to be connected to the motor and rotate in conjunction with the parking gear, and the cogging torque of the motor. When the rotation speed is Ncg, the number of teeth of the parking gear is Np, and the integer is L, the relationship is L × Ncg = Np.

Unlike the configuration (1) described above, when the parking lock pole is assembled, the parking gear or the parking rod and the parking lock pole can be used even when the first gear is directly connected to and interlocked with the parking gear and the rotor. There is a risk of interference.
However, by satisfying the relationship of L × Ncg = Np, the parking gear stops at a position where it engages with the parking lock pole due to the cogging phase relationship between the rotor and the stator. For this reason, it is possible to prevent the parking lock pole from interfering with the parking gear or the parking rod during assembly.

It is a model perspective view of the parking apparatus of 1st Embodiment. It is a schematic plan view of the parking apparatus of 1st Embodiment. It is a perspective view of a parking device of a 1st embodiment. It is a model perspective view of the parking apparatus of 2nd Embodiment.

First, a first embodiment of the present invention will be described.
(First embodiment)
FIG. 1 is a schematic perspective view of the parking apparatus according to the first embodiment.
FIG. 2 shows a schematic plan view of the parking apparatus.
FIG. 3 is a perspective view of the parking apparatus.
The parking apparatus 100 includes a stator 10, a rotor 20, a first gear 40, a second gear 50, a parking gear 60, and a parking lock pole 70.
The stator 10 and the rotor 20 are components of a motor 30 that is a driving device for an automobile (not shown). The parking apparatus 100 of 1st Embodiment is used for the motor 30 as a driving force used for a hybrid car.

The motor 30 is a three-phase concentrated winding coil, and the rotor 20 is provided with eight rotor magnets 22.
The rotor 20 and the first gear 40 are connected by a shaft 25 and are configured to be interlocked. The second gear 50 is coupled to the parking gear 60 and is configured to be interlocked. The first gear 40 and the second gear 50 are arranged so as to mesh with each other.
Parking lock pole 70 is arranged to engage with parking gear 60.
The first gear 40 and the second gear 50 are bevel gears, and the parking gear 60 is a gear provided with an engaging groove 60 a and an engaging tooth portion 60 b that engage with the parking lock pole 70. The tooth thickness of the engaging tooth portion 60b is set to be thick enough to withstand the load for stopping the automobile.

The parking lock pole 70 is formed using a thick plate-like steel material so that it can withstand the load for stopping the automobile, like the engaging tooth portion 60b. As shown in FIG. 2, one end is rotatably supported by a support portion 102 formed in a part of the case 101. Further, a projection 70 a is formed at the other end, and engages with an engagement groove 60 a formed between adjacent engagement teeth 60 b of the parking gear 60.
The parking lock pole 70 is formed with an engaging portion 70b. The engaging portion 70b engages with a parking rod 77 that protrudes from the case 101 and is removably attached. A sleeve 75 for guiding the parking rod 77 is also provided in the case 101, and the tip of the parking rod 77 is guided through the sleeve 75.

The parking lock pole 70 is urged so as to contact the parking rod 77 by a torsion spring (not shown).
A cover guide 72 is provided on the upper portion of the engaging portion 70b, and regulates the width of movement of the parking lock pole 70.
The parking rod 77 has a cam surface 77 a formed in a conical shape in the vicinity of the tip, and is in contact with the engaging portion 70 b of the parking lock pole 70. The parking rod 77 is connected to the actuator 110, and is configured to advance and retract inside the sleeve 75 by the actuator 110.

The cam surface 77a of the parking rod 77 is at the lower end and is guided by the inner peripheral surface of the sleeve 75 on the lower side of the drawing in FIG. 2, and the cam surface 77a moves to the upper side of the drawing in FIG. The pole 70 is moved.
Then, the cam surface 77a moves in the direction of jumping out of the sleeve 75, so that the slope of the cam surface 77a interferes with the engaging portion 70b of the parking lock pole 70 and rotates the parking lock pole 70.
When the parking rod 77 moves to the upper end side, the parking lock pole 70 is riding on the parking gear 60, and if the parking gear 60 turns a little, it is bitten and enters the parking state.

The detent spring 80 has one end fixed to the case 101 and the other end engaged with a lock lever (not shown) connected to the actuator 110. This lock lever is connected to the actuator 110 and the parking rod 77, and engages with the detent spring 80 to act so that the parking rod 77 is at the rising end when the actuator 110 does not operate.
By operating the actuator 110, the detent spring 80 is extended by the torque of the actuator 110, and the parking rod 77 is lowered.

As described above, since the motor 30 has eight poles, the cogging torque rotational speed Ncg is 8 × 3 = 24.
The parking gear tooth number Np of the parking gear 60 is 15, and the first gear tooth number Ndv of the first gear 40 and the second gear tooth number Ndn of the second gear 50 are the first gear tooth number Ndv / The second gear teeth number Ndn = 8/5.
The number of poles of the motor 30, the first gear tooth number Ndv, the first gear tooth number Ndv, and the parking gear tooth number Np can be appropriately changed as long as the relationship Ncg / Np = Ndv / Ndn is maintained.

Since 1st Embodiment becomes the structure demonstrated above, there exists an effect | action and effect which are demonstrated below.
First, the effect is that the assembling property of the parking apparatus 100 can be improved.
The parking device 100 according to the first embodiment includes a parking gear 60 that rotates in conjunction with the motor 30, and in the structure of the parking device 100 used in the drive mechanism, the parking lock that meshes with the parking gear 60 and is supported so as to be rotatable. The first gear 40 connected to the pole 70, the rotor 20 of the motor 30, the second gear 50 that meshes with the first gear 40 and rotates in conjunction with the parking gear 60, and the parking lock pole 70. A parking rod 77 for rotating the parking lock pole 70, the cogging torque rotation speed of the motor 30 as the cogging torque rotation speed Ncg, the parking gear 60 as the number of teeth, the parking gear teeth number Np, and the first gear 40 as The number of teeth is the first gear tooth number Ndv, and the number of teeth of the second gear 50 is the second gear tooth number Ndn. When, by being configured so as to be in the relationship of Ncg / Np = Ndv / Ndn, at a position where meshing with the parking gear 60 and the parking lock pole 70, in which the parking gear 60 is stopped.

Since the parking device 100 needs to be combined with parts such as the parking lock pole 70 inside the case 101, the parking device 100 needs to be assembled in a narrow space and has poor assemblability. The parking lock pole 70 rotatably supported by the case 101 meshes with the parking gear 60 and is pressed by the cam surface 77a of the parking rod 77 to rotate.
For this reason, when the parking rod 77 is at the rising end, the parking lock pole 70 needs to move to the position depicted by the solid line in FIG. 3 by interfering with the parking lock pole 70 and the protrusion 70a.

However, the protrusion 70 a provided on the parking lock pole 70 needs to be engaged with the engagement groove 60 a of the parking gear 60.
The parking rod 77 is configured to be pulled down to the lower end by the actuator 110, and is arranged so that the cam surface 77a is at the upper end by the retainer spring 80 when the actuator is stopped.
For this reason, if the parking gear 60 is displaced and the engaging tooth portion 60 b of the parking gear 60 exists at a position where it cannot engage with the parking rod 77, the parking rod 77 cannot be simply assembled from the upper surface side of the case 101.

  However, the cogging torque rotation speed of the motor 30 is the cogging torque rotation speed Ncg, the parking gear 60 teeth is the parking gear teeth Np, the first gear 40 is the first gear teeth Ndv, and the second gear 50 is When the number of teeth is the second gear tooth number Ndn, the configuration is such that Ncg / Np = Ndv / Ndn, so that the parking gear 60 stops in an unloaded state due to the influence of the cogging phase of the motor 30. As for the position, the engaging groove 60a and the engaging tooth portion 60b are arranged at a position where the protruding portion 70a of the parking lock pole 70 is engaged.

Conventionally, the number of teeth of the parking gear 60 and the number of cogging torques have been designed based on the strength requirements regardless of the number of teeth, but in this way, by utilizing the characteristics of the cogging torque generated by the motor 30, the gear ratio is matched. Since the parking gear 60 and the parking lock pole 70 are stopped at the position where they are engaged, the degree of freedom of the assembly order of the assembly parts is increased. This simplifies the assembly process and is effective for automatic assembly.
For this reason, the cost at the time of the assembly of the parking apparatus 100 can be reduced.

Next, a second embodiment of the present invention will be described.
(Second Embodiment)
FIG. 4 shows a schematic perspective view of the parking apparatus.
The configuration of the parking apparatus 100 according to the second embodiment is different from the configuration of the parking apparatus 100 according to the first embodiment in that the first gear 40 and the parking gear 60 are directly coupled without the second gear 50. .
The shaft 25 of the rotor 20 is connected to the first gear 40. Therefore, the rotor 20 and the first gear 40 are configured to be interlocked.

And the parking gear 60 is arrange | positioned at the upper part of the 1st gear 40, and it is comprised so that the 1st gear 40 and the parking gear 60 may interlock | cooperate.
Since the parking gear 60 and the parking lock pole 70 are arranged to engage with each other and the parking lock pole 70 is rotatably held in the case 101 as in the first embodiment, The parking gear 60 and the parking lock pole 70 are engaged with each other.

The gear ratio between the first gear 40 and the parking gear 60 of the second embodiment is such that the cogging torque rotational speed of the motor 30 is the cogging torque rotational speed Ncg, the number of teeth of the parking gear 60 is the parking gear tooth number Np, and the integer is When an integer L is set, L × Ncg = Np.
By configuring the parking device 100 in this way, the stop position of the parking gear 60 in the unloaded state is disposed at a position where it engages with the parking lock pole 70.
The assembly condition of the parking lock pole 70 needs to be assembled inside the case 101 as in the first embodiment, and there is also interference with the parking rod 77. For this reason, it becomes possible to improve the assembling property of the parking lock pole 70 by stopping the parking gear 60 at a position where it engages with the parking lock pole 70.

Although the invention has been described according to the present embodiment, the invention is not limited to the embodiment, and by appropriately changing a part of the configuration without departing from the spirit of the invention. It can also be implemented.
For example, changing the number of poles of the motor 30 is not prevented. Moreover, it does not prevent changing within the range of design matters.

  Further, it is desirable that the gear relationship of the first embodiment is Ncg / Np = Ndv / Ndn, but even if the values on the right side and the left side of the equation are not completely equal, if the values are close, the same effect can be obtained. It is done. Further, the relationship of the gear ratio in the second embodiment is desirably L × Ncg = Np. Similarly, even if the values on the right side and the left side of the equation are not completely equal, if the values are close, the same effect can be obtained. can get.

DESCRIPTION OF SYMBOLS 10 Stator 20 Rotor 22 Rotor magnet 25 Shaft 30 Motor 40 1st gear 50 2nd gear 60 Parking gear 60a Engaging groove 60b Engaging tooth part 70 Parking lock pole 70a Protruding part 70b Engaging part 72 Cover guide 75 Sleeve 77 Parking rod 77a Cam surface 80 Detent spring 100 Parking device 101 Case 102 Supporting part 110 Actuator

Claims (3)

In a parking device that includes a parking gear that rotates in conjunction with a motor and is used in a drive mechanism,
A parking lock pole which is supported so as to be able to mesh with the parking gear and rotate;
A first gear connected to a rotor of the motor;
A parking rod for rotating the parking lock pole in contact with the parking lock pole;
With
The gear ratio between the parking gear and the first gear is determined based on the cogging torque rotation speed of the motor,
The parking device, wherein the parking gear stops at a position where the parking gear and the parking lock pole mesh with each other. The parking apparatus according to claim 1, wherein
A second gear that meshes with the first gear and rotates in conjunction with the parking gear;
If the cogging torque rotation speed of the motor is Ncg, the number of teeth of the parking gear is Np, the number of teeth of the first gear is Ndv, and the number of teeth of the second gear is Ndn,
A parking apparatus configured to have a relationship of Ncg / Np = Ndv / Ndn. The parking apparatus according to claim 1, wherein
The first gear is connected to the motor and is configured to rotate in conjunction with the parking gear;
If the cogging torque rotation speed of the motor is Ncg, the number of teeth of the parking gear is Np, and the integer is L,
A parking apparatus configured to have a relationship of L × Ncg = Np.

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