Parking lock device

Abstract

The present invention may provide a parking lock device comprising: a braking motor comprising a first shaft; a rotary member disposed on the first shaft and including teeth; and a locking unit disposed on a housing of the motor, wherein the locking unit comprises a second shaft, a cam part coupled to the second shaft, and a stopper rotatably coupled to the housing and disposed between the rotary member and the cam part, and the stopper engages with the teeth by being linked to the cam part and thereby restricts the rotation of the first shaft.

Description

parking lock device

[0001] The present invention relates to a parking lock device.

[0002] The electronic brake system of a vehicle is a device that brakes the vehicle by the operation of a motor and a reducer. Compared to a mechanical brake system, it is lighter and has excellent responsiveness, and has the advantage of being less restricted in installation space. In addition, it is a device that operates automatically using an actuator according to the vehicle's operating status without the driver manually operating it.

[0003] Electronic braking systems may include an electric parking brake function. This parking brake function may be implemented by a configuration in which the braking motor rotates to pull the parking cable, thereby generating tension to expand the shoes inside the DIH (Drum In Hat) of the wheel, thereby securing braking power, or the motor rotates to advance the piston of the spindle, thereby pushing the pads, thereby bringing the disc and pads into close contact, thereby securing braking power.

[0004] However, in order to add a parking brake function to an electronic braking device, a separate configuration must be added, which requires a lot of installation space and complicates the configuration of related parts such as a reducer.

[0005] Accordingly, the present invention aims to provide a parking lock device capable of adding a parking brake function to an electronic braking device with a relatively simple configuration.

[0006] The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below.

[0007] The embodiment may provide a parking lock device including a braking motor including a first shaft, a rotating member disposed on the first shaft and including teeth, and a locking member disposed on a housing of the motor, wherein the locking member includes a second shaft, a cam portion coupled to the second shaft, and a stopper rotatably coupled to the housing and disposed between the rotating member and the cam portion, wherein the stopper is coupled to the cam portion and the teeth in conjunction with each other, thereby limiting rotation of the first shaft.

[0008] The stopper may include a first surface facing the rotating member and a second surface facing the cam portion, and the second surface may be a curved surface that contacts the cam portion.

[0009] An elastic member is disposed in the housing and is in contact with one side of the stopper, and the elastic member may be a member having a restoring force when contracted in the rotational direction.

[0010] The curvature of the second surface may be smaller than the curvature of the cam portion.

[0011] The housing includes a cam stopper that contacts the cam portion, and the cam stopper includes a first curved surface and a second curved surface that are arranged continuously, and when the cam portion contacts the first curved surface, the first surface contacts the rotating member, and when the cam portion contacts the second curved surface, the first surface can be spaced apart from the rotating member.

[0012] When the first surface is in contact with the rotating member, the top dead center of the cam portion may be arranged adjacent to the first curved surface, and when the first surface is spaced apart from the rotating member, the top dead center of the cam portion may be arranged adjacent to the second curved surface.

[0013] The stopper includes a projection facing the rotating member, and the first surface can be disposed on the projection.

[0014] The first surface includes a first surface, a first surface that is bent at a first angle at a first point of the first surface, and a first surface that is bent at a second angle at a second point of the first surface, and the first angle and the second angle are each obtuse angles and may be different from each other.

[0015] The tooth includes a third surface facing the stopper, the third surface includes a 3-1 surface, a 3-2 surface bent at a third angle at a third point of the 3-1 surface, and a 3-3 surface bent at a fourth angle at a fourth point of the 3-1 surface, the third angle and the fourth angle being different from each other, and the third angle may be an obtuse angle.

[0016] The first and second surfaces are arranged to correspond to the third and third surfaces, the first and third surfaces are arranged to correspond to the third and third surfaces, the second point may protrude further toward the rotating member than the first point, and the fourth point may protrude further toward the stopper than the third point.

[0017] The axial direction of the first shaft and the axial direction of the second shaft may be parallel to each other.

[0018] According to one embodiment of the present invention, a parking brake function is added to an electronic braking device, which has the advantage of simplifying the configuration of the entire braking device.

[0019] According to one embodiment of the present invention, by directly restraining the shaft of the braking motor, there is no need for a separate parking brake configuration, thereby reducing the installation space and the number of parts.

[0020] According to one embodiment of the present invention, since the cam portion is fixed to the housing by receiving a reaction force from the elastic member while the top dead center of the cam portion exceeds the position of the stopper, there is an advantage in that the stopper can restrain the shaft even when the power of the driving unit that moves the cam portion is turned off.

[0021] Figure 1 is a drawing showing a parking lock device according to an embodiment;

[0022] Figure 2 is a drawing showing the locking part of the parking lock device shown in Figure 1;

[0023] Figure 3 is an exploded view of the parking lock device illustrated in Figure 1.

[0024] Figure 4 is a drawing showing the teeth of a rotating member.

[0025] Figure 5 is a drawing showing the teeth of a rotating member.

[0026] Figure 6 is a drawing showing a stopper,

[0027] Figure 7 is a plan view of the stopper;

[0028] Fig. 8 is a drawing showing a stopper engaged with a rotating member;

[0029] Figure 9 is a drawing showing a cam and a stopper.

[0030] Figure 10 is a drawing showing a locking part in a state where there is no restraint on the shaft.

[0031] Figure 11 is a drawing showing a locking part in a state where the shaft is restrained.

[0032] Figure 12 is a drawing showing an example of the process in which the protrusion of the stopper and the tooth of the rotating member are engaged.

[0033] Figure 13 is a drawing showing another example of the process in which the protrusion of the stopper and the tooth of the rotating member are engaged.

[0034] Figure 14 is a drawing showing the locking part with the parking brake function released and no restraint on the shaft.

[0035] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0036] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0037] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0038] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0039] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0040] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0041] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0042] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0043] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," it can include the meaning of a downward direction as well as an upward direction based on one component.

[0044] FIG. 1 is a drawing illustrating a parking lock device according to an embodiment, FIG. 2 is a drawing illustrating a locking part (600) of the parking lock device illustrated in FIG. 1, FIG. 3 is an exploded view of the locking part (600) illustrated in FIG. 1, and FIG. 4 is an enlarged drawing illustrating the locking part (600).

[0045] Referring to FIGS. 1 to 4, a parking lock device according to an embodiment may include a braking motor, a rotating member (400), a housing (500), and a locking member (600). The braking motor may include a first shaft (100), a rotor (200), a stator (300), and a housing (500).

[0046] Hereinafter, the inner side means a direction toward the shaft (100) based on the radial direction of the motor, and the outer side means a direction opposite to the inner side. In addition, the circumferential direction and the radial direction are based on the axis center of the motor.

[0047] Below, the parking lock device has the characteristic of having a parking brake function in addition to the vehicle's braking function.

[0048] The shaft (100) can be rotatably supported by a bearing.

[0049] The rotor (200) rotates through electrical interaction with the stator (300). The rotor (200) may be arranged to correspond to the stator (300) and may be arranged inside the stator (300). The rotor (200) may include a rotor core (210) and a magnet (220) arranged on the rotor core (210).

[0050] The stator (300) is disposed on the outside of the rotor (200). The stator (300) may include a stator core (310), an insulator (320), and a coil (330). The insulator (320) is mounted on the stator core (310). The coil (330) may be wound around the insulator (320). The insulator (320) is disposed between the coil (330) and the stator core (310), thereby electrically insulating the stator core (310) and the coil (330) from each other. The coil (330) induces an electromagnetic interaction with the magnet (220) of the rotor (200).

[0051] A rotating member (400) is coupled to a shaft (100). The rotating member (400) is disposed on the outside of a first housing (500A) of a housing (500). The rotating member (400) rotates integrally with the shaft (100) as the shaft (100) rotates. The rotating member (400) is coupled to a locking member (600) and serves to selectively restrain the shaft (100) depending on the position of a stopper (620) of the locking member (600). The rotating member (400) is disposed to overlap the rotor (200) in the axial direction.

[0052] The housing (500) may include a first housing (500A) and a second housing (500B). The first housing (500A) forms a space on the inside for accommodating a rotor (200) and a stator (300). A locking member (600) is disposed on the outside of the first housing (500A). The second housing (500B) forms a space for accommodating the locking member (600). The second housing (500B) may be coupled to the first housing (500A).

[0053] The second housing (500B) may include a cover (CV) covering one open side. A sealing member (SE) may be arranged on the cover (CV).

[0054] The locking unit (600) is a device that implements a parking brake function by restraining the shaft (100) from rotating when a signal is applied when the vehicle is stopped. The locking unit (600) can receive power and signals from the outside.

[0055] The locking part (600) may include a second shaft (610), a cam part (620), a stopper (630), and a driving part (640).

[0056] The second shaft (610) may be a rotation axis of the driving unit (640). The axial direction of the second shaft (610) may be arranged parallel to the axial direction of the first shaft (100). The second shaft (610) is arranged spaced apart from the first shaft (100).

[0057] The cam (620) is coupled to the second shaft (610). The cam (620) rotates as the second shaft (610) rotates.

[0058] The stopper (630) is rotatably coupled to the first housing (500A). The axial direction of the stopper (630) may be parallel to the axial direction of the first shaft (100). It may be radially arranged between the rotating member (400) and the cam portion (620). The stopper (630) engages with the rotating member (400) to restrain the first shaft (100). The stopper (630) moves in conjunction with the cam portion (620).

[0059] A flange bush (FB) can be coupled to the stopper (630).

[0060] The driving unit (640) may be a motor.

[0061] The elastic member (650) is fixed to the second housing (500B). The elastic member (650) may be a torsion spring having a restoring force when contracted in the rotational direction. One end of the elastic member (650) is connected to one side of the stopper (630), and the other end of the elastic member (650) is fixed to the second housing (500B) to constantly provide a force for rotating the stopper (630).

[0062] Figure 5 is a drawing showing a tooth (410) of a rotating member (400).

[0063] Referring to FIGS. 4 and 5, the rotating member (400) includes a plurality of teeth (410). The teeth (410) may be arranged on the outer surface of the rotating member (400).

[0064] The tooth (410) may include a third surface (S3) facing the stopper (630).

[0065] The third side (S3) may include the third-first side (S3a), the third-second side (S3b), and the third-third side (S3c).

[0066] The third-second surface (S3b) is bent at a third angle (R3) at the third point (P3) of the third-first surface (S3a) when viewed in the axial direction. The third-third surface (S3c) is bent at a fourth angle (R4) at the fourth point (P4) of the third-first surface (S3a) when viewed in the axial direction. The third angle (R3) and the fourth angle (R4) may be different from each other. The third angle (R3) may be an acute angle, and the fourth angle (R4) may be an obtuse angle.

[0067] The structure of this tooth (410) is to induce alignment between the protrusion (631) of the stopper (630) and the tooth (410).

[0068] Figure 6 is a drawing showing a stopper (630), and Figure 7 is a plan view of the stopper (630).

[0069] Referring to FIGS. 6 and 7, the stopper (630) may include a first surface (S1) and a second surface (S2). The first surface (S1) is positioned facing the rotating member (400). The second surface (S2) is positioned facing the cam portion (620).

[0070] The stopper (630) includes a protrusion (631) facing the rotating member (400). The first surface (S1) is arranged on the protrusion (631).

[0071] The first side (S1) may include a first-first side (S1a), a first-second side (S1b), and a first-third side (S1c).

[0072] The first-second surface (S1b) is bent at a first angle (R1) at a first point (P1) of the first-first surface (S1a) when viewed in the axial direction. The first-third surface (S1c) is bent at a second angle (R2) at a second point (P2) of the first-first surface (S1a) when viewed in the axial direction. The first angle (R1) and the second angle (R2) may be different from each other. The first angle (R1) and the second angle (R2) may be obtuse angles.

[0073] The structure of this protrusion (631) is to induce alignment between the protrusion (631) of the stopper (630) and the tooth (410).

[0074] The stopper (630) may include a first hole (632) into which a rotation axis is inserted. The stopper (630) may rotate about the first hole (632). In addition, the stopper (630) may include a second hole (633) into which one end of an elastic member (650) is inserted and connected. A protrusion (631) may be arranged on one side of the stopper (630) with respect to the first hole (632), and a second hole (633) may be arranged on the other side of the stopper (630).

[0075] Figure 8 is a drawing showing a stopper (630) engaged with a rotating member (400).

[0076] Referring to FIG. 8, when the protrusion (631) of the stopper (630) is engaged between the teeth (410) of the rotary member (400), the first-second surface (S1b) is arranged to face the third-second surface (S3b), and the first-third surface (S1c) is arranged to face the third-third surface (S3c). In this way, when the stopper (630) is engaged with the rotary member (400), the rotation of the rotary member (400) is restricted, thereby limiting the rotation of the first shaft (100).

[0077] Figure 9 is a drawing showing a cam (620) and a stopper (630).

[0078] Referring to Fig. 9, the cam (620) rotates around the first axis (C1). The stopper (630) rotates around the second axis (C2). The outer surface of the cam (620) is in contact with the second surface (S2) of the stopper (630), and the cam (620) rotates around the first axis (C1).

[0079] The second surface (S2) of the stopper (630) may be a concave curved surface facing the cam portion (620). The curvature of the second surface (S2) may be greater than that of the cam portion (620).

[0080] When the cam (620) rotates counterclockwise in the drawing, the top dead center (T) of the cam (620) begins to contact the starting point (ST) of the second surface (S2) and moves along the second surface (S2) to the ending point (ED) of the second surface (S2). When the cam (620) rotates along the second surface (S2) in this way, the stopper (630) rotates counterclockwise around the second axis (C2).

[0081] Fig. 10 is a drawing showing a locking part (600) in a state where there is no restraint on the shaft (100).

[0082] Referring to Fig. 10, when the vehicle is running or stopped and there is no separate signal, power is not applied to the driving unit (640), and the stopper (630) is maintained in a state of not being engaged with the rotating member (400) by the restoring force of the elastic member (650). Then, one end of the stopper (630) contacts the cam member (620). For example, the end of the second surface (S2) may contact the cam member (620).

[0083] The cam member (620) may include a cam stopper (510) disposed on a wall surface of the housing (500). The cam stopper (510) may include a first curved surface (CV1) and a second curved surface (CV2). The first curved surface (CV1) is disposed closer to the rotating member (400) than the second curved surface (CV2). In addition, the first curved surface (CV1) and the second curved surface (CV2) are disposed continuously. A step (D) is located between the first curved surface (CV1) and the second curved surface (CV2).

[0084] Fig. 11 is a drawing showing a locking part (600) in a state where the shaft (100) is restrained.

[0085] Referring to FIG. 11, when the vehicle is in a parked state and a signal related to the parking brake is input and power is applied to the driving unit (640), the second shaft (610) rotates, and when the second shaft (610) rotates, the cam unit (620) rotates. As the cam unit (620) rotates counterclockwise in the drawing, the cam unit (620) moves along the second surface (S2) of the stopper (630), and pushes the stopper (630) toward the rotating member (400) while overcoming the restoring force of the elastic member (650).

[0086] The cam (620) is positioned on the first curved surface (CV1), and the top point (T) of the cam (620) is located between the second surface (S2) and the first curved surface (CV1) when viewed in the axial direction.

[0087] The protrusion (631) of the stopper (630) is positioned between the teeth (410) of the rotating member (400), and the stopper (630) and the rotating member (400) are engaged to prevent the first shaft (100) from rotating.

[0088] Since the top dead center (T) of the cam (620) is fixed to the housing by receiving the reaction force of the elastic member (650) while exceeding the position of the stopper (630), there is an advantage in that the stopper (630) can restrain the first shaft (100) even when the power of the driving unit (640) that moves the cam (620) is turned off.

[0089] The process of interlocking the stopper (630) and the rotating member (400) is as follows.

[0090] Figure 12 is a drawing showing an example of a process in which a protrusion (631) of a stopper (630) and a tooth (410) of a rotating member (400) are engaged.

[0091] Referring to Fig. 12, when the cam (620) rotates and pushes the stopper (630), the protrusion (631) comes into contact with the tooth (410).

[0092] During the process of the protrusion (631) contacting the tooth (410), if the second point (P2) of the protrusion (631) first contacts the 3-1 surface (S3a) of the tooth (410), the protrusion (631) moves along the 3-1 surface (S3a) of the tooth (410) toward the 4th point (P4). When the tooth (410) pushes the 3-1 surface (S3a), since the 3rd point (P3) of the tooth (410) protrudes radially more than the 4th point (P4), the rotary member (400) rotates counterclockwise in the drawing, and the protrusion (631) enters the space (SP1) between the teeth (410) and the teeth (410), so that the stopper (630) and the rotary member (400) engage. Here, the third point (P3) may correspond to one edge of the tooth (310) when viewed in the axial direction, and the fourth point (P4) may correspond to the other edge of the tooth (310) when viewed in the axial direction.

[0093] Fig. 13 is a drawing showing another example of the process in which the protrusion (631) of the stopper (630) and the tooth (410) of the rotating member (400) are engaged.

[0094] Referring to Fig. 13, when the cam (620) rotates and pushes the stopper (630), the protrusion (631) comes into contact with the tooth (410).

[0095] During the process in which the protrusion (631) contacts the tooth (410), when the third point (P3) of the tooth (410) first contacts the 1-1 surface (S1a) of the tooth (410), the protrusion (631) pushes the tooth (410) so that the rotary member (400) rotates clockwise in the drawing. As the rotary member (400) rotates clockwise in the drawing, the protrusion (631) enters the space (SP2) between the teeth (410) and the teeth (410), so that the stopper (630) and the rotary member (400) engage.

[0096] Fig. 14 is a drawing showing the locking part (600) in a state where the parking brake function is released and there is no restraint on the shaft (100).

[0097] Referring to Fig. 14, when the parking brake function is released, a signal related to the parking brake is input, and power is applied to the driving unit (640), the second shaft (610) rotates in reverse. When the second shaft (610) rotates in reverse, the cam unit (620) rotates in reverse. As the cam unit (620) rotates clockwise in the drawing, the cam unit (620) rotates along the second surface (S2) of the stopper (630) so that the top dead center (T) is positioned adjacent to the second curved surface (CV2). Therefore, the pressure of the cam unit (620) on the stopper (630) is released, and the stopper (630) rotates counterclockwise by the restoring force of the elastic member (650), thereby releasing the engagement between the rotating member (400) and the stopper (630). The cam unit (620) is mounted on the second curved surface (CV2). And the cam (620) is pressed by the stopper (630) by the restoring force of the elastic member (650) while mounted on the second curved surface (CV2).

[0098] Above, a parking lock device according to a preferred embodiment of the present invention has been specifically examined with reference to the attached drawings.

[0099] It should be understood that the above-described embodiments of the present invention are illustrative in all respects and not restrictive. The scope of the present invention will be determined by the claims that follow, rather than by the detailed description set forth above. Furthermore, the meaning and scope of these claims, as well as all possible modifications or variations derived from their equivalent concepts, should be construed as encompassing the scope of the present invention.

Claims

1. A braking motor including a first shaft A rotating member disposed on the first shaft and including a tooth; and Including a locking part arranged in the housing of the above motor, The above locking member includes a second shaft, a cam coupled to the second shaft, and a stopper rotatably coupled to the housing and positioned between the rotating member and the cam. A parking lock device in which the stopper is coupled with the cam and the tooth to limit the rotation of the first shaft.

2. In paragraph 1, The above stopper includes a first surface positioned opposite the rotating member and a second surface positioned opposite the cam portion, A parking lock device wherein the second surface is a curved surface that comes into contact with the cam.

3. In paragraph 1, Including an elastic member arranged in the housing and in contact with one side of the stopper, A parking lock device in which the above elastic member is a member having restoring force when contracted in the direction of rotation.

4. In paragraph 3, A parking lock device in which the curvature of the second surface is smaller than the curvature of the cam portion.

5. In paragraph 3, The above housing includes a cam stopper in contact with the cam portion, The above cam stopper comprises a first curved surface and a second curved surface which are arranged sequentially, When the above cam contacts the first curved surface, the first surface contacts the rotating member, A parking lock device in which the first surface is separated from the rotating member when the cam contacts the second surface.

6. In paragraph 5, When the first surface is in contact with the rotating member, the top dead center of the cam is positioned adjacent to the first curved surface, A parking lock device in which the top dead center of the cam is positioned adjacent to the second curved surface when the first surface is spaced apart from the rotating member.

7. In paragraph 1, The above stopper includes a projection facing the rotating member, The above first surface is a parking lock device arranged on the above projection.

8. In paragraph 7, The first surface includes a first surface, a first surface that is bent at a first angle at a first point of the first surface, and a first surface that is bent at a second angle at a second point of the first surface. A parking lock device in which the first angle and the second angle are each obtuse angles and different from each other.

9. In paragraph 8, The above tooth includes a third surface facing the stopper, The third side includes the third-1 side, the third-2 side bent at a third angle at the third point of the third side of the third-1 side, and the third-3 side bent at a fourth angle at the fourth point of the third-1 side. The third angle and the fourth angle are different from each other, The third angle above is an obtuse parking lock device.

10. In paragraph 9, It is arranged in correspondence with the above 1-2 pages and the above 3-3 pages, It is arranged in correspondence with the above 1-3 pages and the above 3-2 pages, The second point protrudes further toward the rotating member than the first point, A parking lock device in which the fourth point protrudes further toward the stopper than the third point.

11. In paragraph 1, A parking lock device in which the axial direction of the first shaft and the axial direction of the second shaft are parallel to each other.

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