Parking lock apparatus

Abstract

The present invention may provide a parking lock apparatus comprising: a braking motor including a first shaft; and a locking unit disposed at one side of the motor, wherein: a portion of the first shaft, exposed out of the motor, is at least partially formed in a non-circular shape; the locking unit includes a stopper which reciprocates toward the non-circular portion of the first shaft, as necessary; and the stopper of the locking unit is brought into contact with the non-circular portion of the first shaft to restrain 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. It is a device that operates automatically using an actuator according to the vehicle's operating status without the driver manually operating it.

[0003] These electronic braking devices 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 contact, thereby securing braking power.

[0004] However, in order to add a parking brake function to an electronic braking device, a separate component 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 is intended to solve the above-mentioned problem, and its purpose is to provide a parking lock braking device in which a parking brake function is added to the parking lock braking device, thereby simplifying the configuration of the entire braking device.

[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 and a locking part arranged on one side of the motor, wherein the first shaft has at least a part of a portion exposed to the outside of the motor formed non-circular, and the locking part has a stopper that reciprocates toward the non-circular portion of the first shaft when necessary, and the stopper of the locking part contacts the non-circular portion of the first shaft to restrict rotation of the first shaft.

[0008] The above locking member may include a second shaft provided with the stopper at one end and a driving member for reciprocating the second shaft.

[0009] The driving member includes a nut member and a fixing member arranged radially outside the nut member, the nut member rotates due to electromagnetic interaction between the nut member and the fixing member, and the second shaft is coupled to the nut member and can reciprocate toward the first shaft according to the rotational direction of the nut member.

[0010] The stopper may include a first protrusion and a second protrusion that contact the non-circular portion of the first shaft, and the first protrusion may be formed to protrude toward the first shaft more than the second protrusion.

[0011] The first protrusion includes the first surface, the second protrusion includes the second surface, and the first surface and the second surface are formed to form an angle with each other, thereby forming a groove into which a non-circular portion of the first shaft is inserted.

[0012] When the first shaft rotates in the first direction, the first shaft may first contact the first protrusion or the second protrusion, and when the first shaft rotates in the second direction opposite to the first direction, the first shaft may first contact the first protrusion.

[0013] The above locking member may include a cover coupled to the upper surface.

[0014] The non-circular portion of the first shaft may include a third face, a fourth face, and a fifth face that are arranged to form an angle with each other.

[0015] The first surface of the stopper may be in contact with one of the third surface, the fourth surface, and the fifth surface of the first shaft, and the second surface of the stopper may be in contact with another of the third surface, the fourth surface, and the fifth surface of the first shaft.

[0016] The non-circular portion of the first shaft may include a plurality of convex portions, the plurality of convex portions may form a groove therebetween, and the stopper may include a spherical portion in contact with the groove.

[0017] 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.

[0018] 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.

[0019] Figure 1 is a drawing showing a parking lock device according to an embodiment;

[0020] Figure 2 is a side cross-sectional view of the parking lock device illustrated in Figure 1;

[0021] Figure 3 is a drawing showing the first shaft;

[0022] Fig. 4 is a cross-sectional view of the first shaft based on AA of Fig. 3;

[0023] Figure 5 is a drawing showing a locking part placed on the cover of the housing;

[0024] Figure 6 is an exploded view of the locking part.

[0025] Figure 7 is a side cross-sectional view of the locking part;

[0026] Figure 8 is a drawing showing a state in which the first shaft is restrained by a stopper.

[0027] Figure 9 is a drawing showing a state in which the restraint on the first shaft is released.

[0028] Fig. 10 is a drawing showing one example of a process in which a stopper and a first shaft are coupled;

[0029] Fig. 11 is a drawing showing another example of the process of combining the stopper and the first shaft;

[0030] Figure 12 is a drawing showing another example of the process of combining the stopper and the first shaft.

[0031] Fig. 13 is a drawing showing a stopper of a locking part included in a parking lock device according to another embodiment;

[0032] FIG. 14 is a drawing showing a first shaft included in a parking lock device according to another embodiment;

[0033] Fig. 15 is a drawing showing a state in which the first shaft is restrained by the stopper of the locking part shown in Fig. 13.

[0034] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Fig. 1 is a drawing illustrating a parking lock device according to an embodiment, and Fig. 2 is a side cross-sectional view of the parking lock device illustrated in Fig. 1.

[0044] Referring to FIGS. 1 and 2, a parking lock device according to an embodiment may include a braking motor and a locking unit (400). The braking motor may include a first shaft (100), a rotor (200), and a housing (500).

[0045] Hereinafter, the inner side means a direction arranged toward the first shaft (100) based on the radial direction of the parking lock device, 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 axial center of the parking lock device.

[0046] Below, the parking lock device has the characteristic of having a parking brake function in addition to the vehicle's braking function.

[0047] The first shaft (100) is rotatably supported by a bearing arranged in the housing (500).

[0048] The rotor (200) rotates through electromagnetic interaction with the stator (300). The rotor (200) may be arranged in correspondence with the stator (300) and may be arranged inside the stator (300). The rotor (200) may include a magnet.

[0049] 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 a magnet of the rotor (200).

[0050] The locking unit (400) is placed in the housing (500). The locking unit (400) is a device that implements a parking brake function by restraining the first shaft (100) from rotating when a signal is applied when the vehicle is stopped. The locking unit (400) can receive power and signals from the outside.

[0051] The housing (500) may include a housing body (510) and a cover (520). The housing body (510) has a cylindrical shape with an open top. The cover (520) covers the open top of the housing body (510).

[0052] FIG. 3 is a drawing illustrating a first shaft (100), and FIG. 4 is a cross-sectional view of the first shaft (100) based on AA of FIG. 3.

[0053] Referring to FIGS. 3 and 4, the first shaft (100) includes an area that comes into contact with the stopper (420) of the locking portion (400), and this area is hereinafter referred to as a non-circular portion (110). The non-circular portion (110) is a portion of the outer surface of the first shaft (100), and may be provided in a portion of the first shaft (100) that is exposed outside the housing (500).

[0054] This non-circular portion (110) is positioned in the axial direction of the first shaft (100) to correspond to the stopper (420). The non-circular portion (110) may be a separate component from the first shaft (100) and may be coupled to the first shaft (100). Alternatively, the non-circular portion (110) may be formed integrally with the first shaft (100) and may be a part of the first shaft (100).

[0055] The non-circular portion (110) may have a polygonal prism shape. For example, the non-circular portion (110) may include a third face (S3), a fourth face (S4), and a fifth face (S5). The third face (S3), the fourth face (S4), and the fifth face (S5) may be arranged to form a triangle when viewed in the axial direction of the first shaft (100). For example, the third face (S3), the fourth face (S4), and the fifth face (S5) may be arranged to form an equilateral triangle when viewed in the axial direction of the first shaft (100).

[0056] The corners (CN) of the triangle formed by the third side (S3), the fourth side (S4), and the fifth side (S5) may have a round shape.

[0057] This non-circular portion (110) can be formed in the radial direction of the first shaft (100) so as not to protrude beyond the outer surface of the first shaft (100).

[0058] FIG. 5 is a drawing showing a locking part (400) placed on a cover (520) of a housing (500), and FIG. 6 is an exploded view of the locking part (400).

[0059] Referring to FIGS. 5 and 6, the locking portion (400) can be placed on the cover (520) of the housing (500). The locking portion (400) can be assembled to the bracket (460). The plate (450) can be coupled to the cover (520) of the housing (500). The bracket (460) can be coupled to the plate (450). The locking portion (400) can be coupled to the cover (520) of the housing (500) via the bracket (460) and the plate (450).

[0060] The locking member (400) may include a driving member (440), a second shaft (410), and a stopper (420).

[0061] The driving unit (440) may include a nut member (430) into which a second shaft (410) is movably inserted, a fixing member (450) disposed radially outside the nut member (430), a bearing (B) disposed between the nut member (430) and the second shaft (410), and a housing (470) surrounding them. The nut member (430) may be a rotor disposed opposite to a stator of the driving unit (440). When a signal is applied to the driving unit (440), the nut member (430) may rotate by electromagnetic interaction between the nut member (430) and the fixing member (450). Screw threads may be formed on the inner circumferential surface of the nut member (430).

[0062] The second shaft (410) is placed on the inside of the nut member (430). A screw thread may be formed on the outer circumferential surface of the second shaft (410).

[0063] A bearing (B) may be arranged between the nut member (430) and the second shaft (410). The bearing (B) may be a ball bearing arranged between the screw threads of the nut member (430) and the screw threads of the second shaft (410).

[0064] A stopper (420) is placed at the end of the first shaft (100). The stopper (420) comes into contact with the first shaft (100) and serves to restrict the rotation of the first shaft (100).

[0065] When the driving unit (440) operates and the nut member (430) rotates, the second shaft (410) moves linearly. As the second shaft (410) moves linearly, the stopper (420) moves linearly back and forth.

[0066] Figure 7 is a side cross-sectional view of the locking part (400).

[0067] Referring to Fig. 7, a stopper (420) is coupled to an end of a second shaft (410). The stopper (420) may include a first protrusion (P1) and a second protrusion (P2). The first protrusion (P1) and the second protrusion (P2) have a shape that is spaced apart from each other to form a groove (G). The first protrusion (P1) may include a first surface (S1) that is flat. The second protrusion (P2) may include a second surface (S2) that is flat. The first surface (S1) and the second surface (S2) are surfaces that contact the non-circular portion (110) of the first shaft (100). When viewed in the axial direction of the first shaft (100), the first surface (S1) and the second surface (S2) may be arranged to face each other. When viewed from the axial direction of the first shaft (100), the angle (R) formed by the first surface (S1) and the second surface (S2) may be an acute angle.

[0068] The first protrusion (P1) may be formed to protrude a predetermined distance (d) toward the first shaft (100) more than the second protrusion (P2).

[0069] Figure 8 is a drawing showing a state in which the first shaft (100) is restrained by a stopper (420).

[0070] Referring to Fig. 8, when the vehicle is parked and a signal related to the parking brake is input to the driving unit (440 of Fig. 6), the driving unit (440) operates. When the driving unit (440) operates, the nut member (430) rotates. When the nut member (430) rotates, the second shaft (410) moves forward toward the first shaft (100). When the second shaft (410) moves forward, the first surface (S1) of the stopper (420) contacts the fourth surface (S4) of the non-circular portion (110), and the second surface (S2) of the stopper (420) contacts the third surface (S3) of the non-circular portion (110), thereby engaging the first shaft (100) and the stopper (420).

[0071] In this way, since the first shaft (100) is restrained by the first surface (S1) and the second surface (S2) of the stopper (420), the first shaft (100) is restrained by the stopper (420) and does not rotate, thereby performing a parking brake function.

[0072] Figure 9 is a drawing showing a state in which the restraint on the first shaft (100) is released.

[0073] Referring to Fig. 9, when the parking brake function is released and a signal related to the parking brake is input to the driving unit (440), the driving unit (440) operates in the opposite direction. When the driving unit (440) operates in the opposite direction, the nut member (430) rotates in the opposite direction. When the nut member (430) rotates in the opposite direction, the second shaft (410) moves away from the first shaft (100), and the stopper (420) is separated from the non-circular portion (110). When the second shaft (410) moves backward in this way, the constraint of the first shaft (100) is released, and the first shaft (100) is converted to a rotatable state.

[0074] Figure 10 is a drawing showing an example of a process in which a stopper (420) and a first shaft (100) are combined.

[0075] Referring to FIGS. 4 and 10, when the second shaft (410) moves forward, if the end of the first surface (S1) of the second shaft (410) that protrudes more than the second surface (S2) of the second shaft (410) first touches the third surface (S3) of the first shaft (100), the end of the first surface (S1) pushes the first shaft (100), causing the first shaft (100) to rotate counterclockwise, and if the fourth surface (S4) of the first shaft (100) contacts the second surface (S2) of the stopper (420), and the third surface (S3) of the first shaft (100) contacts the first surface (S1) of the stopper (420), the first shaft (100) naturally engages the groove (G) of the stopper (420).

[0076] Since the edge of the first shaft (100) is formed into a curved surface, the first shaft (100) can naturally engage with the groove (G) of the stopper (420) as the stopper (420) moves forward.

[0077] Fig. 11 is a drawing showing another example of the process in which the stopper (420) and the first shaft (100) are coupled.

[0078] Referring to FIG. 4 and FIG. 11, when the second shaft (410) moves forward, if the end of the first surface (S1) of the second shaft (410) that protrudes more than the second surface (S2) of the second shaft (410) first touches the fourth surface (S4) of the first shaft (100), the end of the first surface (S1) pushes the first shaft (100), the first shaft (100) rotates clockwise, and the fourth surface (S4) of the first shaft (100) contacts the first surface (S1) of the stopper (420), and the third surface (S3) of the first shaft (100) contacts the second surface (S2) of the stopper (420), the first shaft (100) naturally engages with the groove (G) of the stopper (420).

[0079] Fig. 12 is a drawing showing another example of the process in which the stopper (420) and the first shaft (100) are coupled.

[0080] Referring to FIG. 4 and FIG. 12, when the second shaft (410) moves forward, if the end of the second surface (S2) of the second shaft (410) which is shorter than the first surface (S1) of the second shaft (410) first touches the third surface (S3) of the first shaft (100), the end of the second surface (S2) pushes the first shaft (100), and the first shaft (100) rotates counterclockwise, and the third surface (S3) of the first shaft (100) contacts the second surface (S2) of the stopper (420), and the fourth surface (S4) of the first shaft (100) contacts the first surface (S1) of the stopper (420), the first shaft (100) naturally engages the groove (G) of the stopper (420).

[0081] FIG. 13 is a drawing showing a stopper (420) of a locking part (400) included in a parking lock device according to another embodiment, and FIG. 14 is a drawing showing a first shaft (100) included in a parking lock device according to another embodiment.

[0082] Referring to FIG. 13, the stopper (420) of the locking part (400) included in the parking lock device according to another embodiment includes a spherical part (P).

[0083] Referring to Fig. 14, a non-circular portion (110) of a first shaft (100) of a parking lock device according to another embodiment may include a plurality of convex portions (CN). A groove (G) is formed between the convex portions (CN) and the spherical portion (P) is in contact with the groove. Each of the several convex portions (CN) may include a curved surface.

[0084] FIG. 15 is a drawing showing a state in which the first shaft (100) is restrained by the stopper (420) of the locking part (400) shown in FIG. 13.

[0085] Referring to Fig. 15, the second shaft (410) moves forward toward the first shaft (100). When the second shaft (410) moves forward, the spherical portion (P) of the stopper (420) moves forward. As the spherical portion (P) moves forward, the spherical portion (P) is positioned in the concave groove (G) between the convex portions (CN) of the first shaft (100). When the spherical portion (P) is positioned between the convex portions (CN) and the convex portions (CN), the first shaft (100) is naturally engaged with the stopper (420). When the first shaft (100) is restrained by the stopper (420), a parking brake function can be implemented.

[0086] Above, a parking lock device according to a preferred embodiment of the present invention has been specifically examined with reference to the attached drawings.

[0087] 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; and Including a locking part arranged on one side of the above motor, The first shaft is formed such that at least a portion of the exposed portion of the motor is non-circular, The above locking member has a stopper that reciprocates toward the non-circular portion of the first shaft when necessary, A parking lock device in which the stopper of the locking part contacts the non-circular portion of the first shaft to restrict rotation of the first shaft.

2. In paragraph 1, A parking lock device including a second shaft provided with the stopper at one end and a driving unit for reciprocating the second shaft.

3. In paragraph 2, The above driving part, Nut absence; Including a fixing member arranged radially outside the above nut member, The above nut member rotates due to the electromagnetic interaction between the nut member and the fixed member, A parking lock device in which the second shaft is coupled to the nut member and reciprocates toward the first shaft in the rotational direction of the nut member.

4. In paragraph 1, The stopper includes a first projection and a second projection that contact the non-circular portion of the first shaft, A parking lock device in which the first protrusion is formed to protrude further toward the first shaft than the second protrusion.

5. In paragraph 4, The first protrusion includes the first surface, The second protrusion includes the second surface, A parking lock device in which the first surface and the second surface are formed to form an angle with each other, thereby forming a groove into which a non-circular portion of the first shaft is inserted.

6. In paragraph 1, When the first shaft rotates in the first direction, the first shaft first contacts the first protrusion or the second protrusion, A parking lock device in which, when the first shaft rotates in a second direction opposite to the first direction, the first shaft first contacts the first projection.

7. In paragraph 1, A parking lock device including a cover with the locking portion coupled to the upper surface.

8. In paragraph 7, A parking lock device wherein the non-circular portion of the first shaft includes a third face, a fourth face, and a fifth face arranged to form an angle with each other.

9. In paragraph 8, The first surface of the stopper is in contact with one of the third surface, fourth surface and fifth surface of the first shaft, A parking lock device in which the second surface of the stopper is in contact with another one of the third surface, fourth surface and fifth surface of the first shaft.

10. In paragraph 1, A parking lock device in which the non-circular portion of the first shaft includes a plurality of convex portions, the plurality of convex portions forming a groove therebetween, and the stopper includes a spherical portion in contact with the groove.

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