Dc-motor type parking actuator for a vehicle and a vehicle comprising the same

Abstract

A parking actuator for a DC motor type vehicle according to one embodiment of the present invention comprises: a DC motor; a first reduction unit for reducing the rotational speed of the DC motor; a second reduction unit for reducing the speed of the first reduction unit; and a third reduction unit for reducing the speed of the second reduction unit and including an output shaft.

Description

Technology Field

[0001] The present invention relates to a DC motor type parking actuator for a vehicle and the vehicle thereof. Background Technology

[0002] Generally, the reduction gear of an electric vehicle is equipped with a parking gear splined to its output shaft or input shaft and a parking pawl inserted into the parking groove of the parking gear to lock the rotation of the parking gear or to release the locking by disengaging from the parking groove.

[0003] A parking actuator is mounted on the reduction gear for the movement of the parking pawl between its locking and unlocking positions.

[0004] Generally, conventional parking actuators are configured to include a three-phase BLDC motor (Brushless DC electric motor), a reduction gear mechanism, and an output shaft.

[0005] BLDC motors have the advantage of being resistant to theft because they have high output power and are three-phase, making it difficult to rotate them by forcibly applying voltage from the outside, but they have the disadvantage of high cost. The problem to be solved

[0006] One embodiment of the present invention aims to provide a parking actuator and a vehicle using a DC motor instead of a BLDC motor.

[0007] In addition, one embodiment of the present invention aims to provide a parking actuator and a vehicle thereof that are structurally compact and have small installation space constraints, while compensating for the disadvantages of DC motors with low output power.

[0008] In addition, one embodiment of the present invention aims to provide a parking actuator and a vehicle that are resistant to theft by compensating for the disadvantages of a DC motor that can be easily rotated by forcibly applying voltage from the outside. means of solving the problem

[0009] A parking actuator for a DC motor type vehicle according to one embodiment of the present invention comprises: a DC motor; a first reduction unit for reducing the rotational speed of the DC motor; a second reduction unit for reducing the speed of the first reduction unit; and a third reduction unit for reducing the speed of the second reduction unit and including an output shaft.

[0010] In at least one embodiment of the present invention, the first reduction gear comprises a first worm rotated by the DC motor and a first worm wheel meshed with the first worm, the second reduction gear comprises a second worm rotated together with the first worm wheel and a second worm wheel meshed with the second worm, and the third reduction gear comprises a planetary gear set.

[0011] In at least one embodiment of the present invention, the invention further comprises a housing and a cover accommodating the DC motor, the first reduction unit, the second reduction unit, and the third reduction unit, wherein within the housing and the cover, the first worm is positioned in a first direction from the DC motor and the first worm wheel is positioned in a third direction perpendicular to the first direction from the first worm and is engaged, the second worm is positioned coaxially with the first worm wheel in a second direction perpendicular to the first direction and the third direction, the second worm wheel is positioned in a direction opposite to the first direction from the second worm and is engaged, and the output shaft extends in the third direction and is exposed so as to be connected outside the cover.

[0012] In at least one embodiment of the present invention, the third reduction gear comprises a sun gear that rotates together with the second worm wheel, a plurality of planetary gears surrounding the sun gear, a carrier on which the plurality of planetary gears are mounted, and a ring gear that surrounds and meshes with the plurality of planetary gears and whose rotation is fixed.

[0013] In at least one embodiment of the present invention, the output shaft is formed to extend integrally from the carrier in the third direction.

[0014] In at least one embodiment of the present invention, the housing includes a sensor receiving portion, and the carrier includes a sensor rod that penetrates the sun gear on the opposite side of the output shaft and extends in the opposite direction of the third direction and is exposed into the sensor receiving portion, and further includes a position sensing portion that is received inside the sensor receiving portion and senses the rotational position of the sensor rod.

[0015] In at least one embodiment of the present invention, the position sensing unit includes a magnet mounted on the sensor rod and a Hall sensor located within the sensor receiving unit spaced apart from the magnet.

[0016] In at least one embodiment of the present invention, a PCB assembly is further included in the housing, wherein the PCB assembly comprises an insulating board including a Hall sensor portion and an outer portion separated by a cut groove penetrating the perimeter wall of the sensor receiving portion, the Hall sensor portion and the outer portion are connected through an opening formed on one side of the perimeter wall of the sensor receiving portion, and the Hall sensor is mounted on the Hall sensor portion.

[0017] In at least one embodiment of the present invention, a power supply line for the DC motor is plated on the outer part.

[0018] In at least one embodiment of the present invention, a PCB assembly providing a power supply line for the DC motor is further included, and the PCB assembly includes a bidirectional switch provided on the power supply line and a logic circuit that receives a signal transmitted from a vehicle controller and outputs a voltage set to the gate of the bidirectional switch through a logic operation.

[0019] Meanwhile, a vehicle according to one embodiment of the present invention includes the aforementioned DC motor type parking actuator. Effects of the invention

[0020] According to one embodiment of the present invention, a cost-reduced parking actuator and the vehicle thereof can be obtained because a DC motor is applied instead of a BLDC motor.

[0021] In addition, according to one embodiment of the present invention, by applying a three-stage reduction, it is possible to obtain a parking actuator and a vehicle that are structurally compact and have small installation space constraints while compensating for the disadvantages of a DC motor with low output power.

[0022] In addition, according to one embodiment of the present invention, by applying an anti-theft circuit, the disadvantage of a DC motor that can be easily rotated by forcibly applying voltage from the outside is compensated for, thereby obtaining a parking actuator and a vehicle that are resistant to theft. Brief explanation of the drawing

[0023] FIG. 1 shows a parking actuator according to one embodiment of the present invention. Figure 2 shows a partial assembly diagram of the actuator of Figure 1. Figure 3 shows an assembly diagram of some parts of the actuator of Figure 1. Figure 4 shows the circuit configuration of the PCB assembly of the actuator of Figure 1. Specific details for implementing the invention

[0024] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0025] The suffixes "module" and "part" used in this specification are used merely for nominal distinction between components and should not be interpreted as presupposing that they are physically or chemically distinguished or separated, or that they can be distinguished or separated in this way.

[0026] Terms containing ordinal numbers, such as “first,” “second,” etc., may be used to describe various components, but said components are not limited by said terms. These terms may be used solely in a nominal sense to distinguish one component from another, and their sequential meaning is determined not by such nomenclature but by the context of the description.

[0027] The term “and / or” is used to include all cases of any combination of the multiple items in question. For example, “A and / or B” means including all three cases, such as “A,” “B,” and “A and B.”

[0028] When it is stated that one component is "connected" or "joined" to another component, it should be understood that while it may be directly connected or joined to that other component, there may also be other components in between.

[0029] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0030] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0031] Hereinafter, a parking actuator according to one embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

[0032] The actuator of this embodiment uses a DC motor (10) instead of a BLDC motor (10), and applies a three-stage reduction to compensate for the reduced output power.

[0033] And, despite such three-stage reduction, the components are compactly arranged so that the external size can be kept small.

[0034] To explain such a compact arrangement and assembly relationship of the components, the x direction (first direction), y direction (second direction), and z direction (third direction) are referenced as shown in FIG. 1.

[0035] First, the actuator of the present embodiment includes a housing (1) and a cover (2) coupled to the housing (1) in a third direction.

[0036] A DC motor (10) is installed in a first direction along one side of the housing (1), and a first worm (11) is positioned in a first direction from the DC motor (10) and connected to the rotation axis of the DC motor (10).

[0037] The first worm wheel (22) is engaged with the first worm (11) in the third direction, and the second worm (21) is positioned in the second direction, rotated coaxially with the first worm wheel (22).

[0038] The first worm wheel (22) and the second worm (21) are connected by the same shaft, and the shaft is supported at one end by a brush and rotated supported at the other end by a bearing.

[0039] The second worm wheel (31) is engaged with the second worm (21) in the opposite direction of the first direction (i.e., - x direction).

[0040] The sun gear (32) is coupled and positioned so that it rotates integrally from the second worm wheel (31) in the third direction.

[0041] And, a plurality of planetary gears (33) are arranged around the sun gear (32), and a ring gear (35) is engaged around the planetary gears (33).

[0042] Here, the ring gear (35) is fixed to the cover (2) so that its rotation is suppressed.

[0043] The planetary gears (33) are mounted on a carrier (34), and the carrier (34) is rotated by the revolution of the planetary gears (33).

[0044] Additionally, the carrier (34) includes an output shaft (34a) that is rotatably supported on the cover (2) and extends in a third direction to connect outside the cover (2).

[0045] Additionally, the carrier (34) includes a sensor rod (34b) that is inserted into the sensor receiving portion (1a) described later, which is extended through the sun gear (32) in the opposite direction of the third direction on the opposite side of the output shaft (34a).

[0046] The actuator of the present embodiment has a structure in which the first worm (11) and the first worm wheel (22) form a first reduction unit that reduces the speed of the DC motor (10), the second worm (21) and the second worm wheel (31) form a second reduction unit, and the planetary gear set (33) forms a third reduction unit.

[0047] Accordingly, when the DC motor (10) rotates, the first worm (11) rotates, and accordingly, the first worm wheel (22) rotates, and the second worm (21), which is coaxially connected to rotate integrally with the first worm wheel (22), rotates, and the second worm wheel (31), which is meshed with the second worm (21), rotates, and as the second worm wheel (31) rotates, the sun gear (32), which is connected to rotate integrally with it, rotates.

[0048] The rotation of the sun gear (32) is transmitted to the planetary gears (33) meshed with it. Since the ring gear (35) is fixed, the planetary gears (33) rotate while rotating, and the carrier (34) rotates due to this rotation, and the rotational force is output to the outside through the output shaft (34a).

[0049] Below, with reference to FIG. 3, the sensing of the rotational position of the output shaft (34a) will be described.

[0050] First, as shown in FIG. 3, the housing (1) is provided with a sensor receiving portion (1a) including a perimeter wall having an opening (1b) formed on one side.

[0051] In addition, the actuator of the present embodiment includes a PCB assembly (40), and the insulating board (44) of the PCB assembly (40) is separated by a cut groove (44a) through which the perimeter wall of the sensor receiving portion (1a) penetrates, and includes a Hall sensor portion (43) (42a) and an outer portion (42b) connected to each other through an opening (1b) formed on one side of the perimeter wall.

[0052] A magnet (41) is mounted on the sensor rod (34b), and a Hall sensor (43) is mounted on the Hall sensor (43) part (42a) to sense the rotational position of the sensor rod (34b) according to the change in the magnetic field caused by the magnet (41).

[0053] In this embodiment, a position sensing unit is configured to sense the rotational position of the sensor rod (34b), i.e., the output shaft (34a), by means of a magnet (41) and a Hall sensor (43).

[0054] The outer part (42b) of the insulating board (44) includes a power supply line for the DC motor (10) plated thereon.

[0055] The insulating board (44) of the PCB assembly (40) includes terminals for electrical connection to the outside as shown in FIG. 4, among which is a motor terminal (T) for power supply to the DC motor (10). M Since ) has two terminals, plus and minus, those terminals (T) from the outside M When power is forcibly supplied to the DC motor (10), the DC motor (10) rotates.

[0056] Because of this, the DC motor (10) may be vulnerable to theft, but in this embodiment, an anti-theft circuit is additionally included to prevent this, and this is described in detail below.

[0057] Referring to FIG. 4, the insulating board (44) has motor terminals (T) for supplying power to the DC motor (10). M ) is included, and a bidirectional switch (50) is provided on the negative line of the power supply line.

[0058] And, the insulation board (44) has controller terminals (T) for receiving a signal from the vehicle controller. V ) is provided, and the controller terminals (T V A logic circuit (51) is included between the gate of the ) and the bidirectional switch (50).

[0059] The logic circuit (51) performs a hardware-encrypted logic operation on the signals transmitted from the vehicle controller and outputs the voltage set accordingly to the gate of the bidirectional switch (50).

[0060] Therefore, the motor terminals (T) are forcibly connected externally. MEven if power is supplied to ), if a normal signal is not received from the vehicle controller, the logic circuit (51) does not output the corresponding voltage to the gate of the bidirectional switch (50), thus providing the effect of preventing theft.

[0061] Meanwhile, a vehicle according to one embodiment of the present invention includes the aforementioned parking actuator.

[0062] For example, although not illustrated, the vehicle of the present embodiment is an electric vehicle, and its reduction gear is equipped with a parking gear splined to an output shaft or an input shaft, and a parking pawl inserted into a parking groove of the parking gear to lock the rotation of the parking gear or disengaged from the parking groove to release the locking. Furthermore, it includes the aforementioned actuator to operate the parking pawl between locking and releasing. Explanation of the symbols

[0063] 1 : Housing 2 : Cover 10: DC motor 11: 1st worm 21: 2nd worm 22: 1st worm wheel 31: Second worm wheel 32: Sun gear 33 : Planetary gear 34 : Carrier 34a: Output shaft 40: PCB assembly 41: Magnet 42a: Hall sensor part 42b : Outer part 43 : Hall sensor 44: Insulation board 50: Bidirectional switch 51: Logic Circuits

Claims

Claim 1 DC motor; a first reduction unit for reducing the rotational speed of the DC motor; a second reduction unit for reducing the first reduction unit; a third reduction unit for reducing the second reduction unit and including an output shaft; The apparatus comprises a housing and a cover accommodating the DC motor, the first reduction unit, the second reduction unit, and the third reduction unit, wherein the first reduction unit comprises a first worm rotated by the DC motor and a first worm wheel meshed with the first worm, the second reduction unit comprises a second worm rotating together with the first worm wheel and a second worm wheel meshed with the second worm, and the third reduction unit comprises a planetary gear set, wherein within the housing and the cover, the first worm is positioned in a first direction from the DC motor, the first worm wheel is positioned in a third direction perpendicular to the first direction from the first worm and meshed, the second worm is positioned coaxially with the first worm wheel in a second direction perpendicular to the first and third directions, the second worm wheel is positioned in a direction opposite to the first direction from the second worm and meshed, and the output shaft extends in the third direction and is connectable outside the cover. Exposed, DC motor type vehicle parking actuator. Claim 2 delete Claim 3 delete Claim 4 A parking actuator for a DC motor type vehicle according to claim 1, wherein the third reduction unit comprises a sun gear that rotates together with the second worm wheel, a plurality of planetary gears surrounding the sun gear, a carrier on which the plurality of planetary gears are mounted, and a ring gear that surrounds and meshes with the plurality of planetary gears and whose rotation is fixed. Claim 5 A parking actuator for a DC motor type vehicle according to claim 4, wherein the output shaft is formed by extending integrally from the carrier in the third direction. Claim 6 A parking actuator for a DC motor type vehicle according to claim 5, wherein the housing includes a sensor receiving portion, the carrier includes a sensor rod that penetrates the sun gear on the opposite side of the output shaft and extends in the opposite direction of the third direction and is exposed into the sensor receiving portion, and further includes a position sensing portion that is received inside the sensor receiving portion and senses the rotational position of the sensor rod. Claim 7 In claim 6, the position sensing unit comprises a magnet mounted on the sensor rod and a Hall sensor located within the sensor receiving unit spaced apart from the magnet, in a DC motor type parking actuator for a vehicle. Claim 8 A DC motor type parking actuator for a vehicle according to claim 7, further comprising a PCB assembly accommodated in the housing, wherein the PCB assembly comprises an insulating board including a Hall sensor portion and an outer portion separated by a cut groove penetrating the perimeter wall of the sensor receiving portion, the Hall sensor portion and the outer portion are connected through an opening formed on one side of the perimeter wall of the sensor receiving portion, and the Hall sensor is mounted in the Hall sensor portion. Claim 9 In claim 8, a DC motor type vehicle parking actuator, wherein a power supply line for the DC motor is plated on the outer part. Claim 10 A parking actuator for a DC motor type vehicle comprising: a DC motor; a first reduction unit for reducing the rotational speed of the DC motor; a second reduction unit for reducing the first reduction unit; a third reduction unit for reducing the second reduction unit and including an output shaft; and a PCB assembly for providing a power supply line for the DC motor, wherein the PCB assembly comprises a bidirectional switch provided on the power supply line and a logic circuit that receives a signal transmitted from a vehicle controller and outputs a voltage set to the gate of the bidirectional switch through a logic operation. Claim 11 In a vehicle comprising a parking actuator, the parking actuator comprises: a DC motor; a first reduction unit for reducing the rotational speed of the DC motor; a second reduction unit for reducing the first reduction unit; and a third reduction unit for reducing the second reduction unit and including an output shaft. The apparatus comprises a housing and a cover accommodating the DC motor, the first reduction unit, the second reduction unit, and the third reduction unit, wherein the first reduction unit comprises a first worm rotated by the DC motor and a first worm wheel meshed with the first worm, the second reduction unit comprises a second worm rotating together with the first worm wheel and a second worm wheel meshed with the second worm, and the third reduction unit comprises a planetary gear set, wherein within the housing and the cover, the first worm is positioned in a first direction from the DC motor, the first worm wheel is positioned in a third direction perpendicular to the first direction from the first worm and meshed, the second worm is positioned coaxially with the first worm wheel in a second direction perpendicular to the first and third directions, the second worm wheel is positioned in a direction opposite to the first direction from the second worm and meshed, and the output shaft extends in the third direction and is connectable outside the cover. A vehicle equipped with an exposed DC motor type parking actuator.

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