Stepless brake device for car seat

Abstract

The present invention relates to a stepless brake device of an automobile seat, in which a coupling piece formed on a plate cover disposed at an outermost back surface is coupled to a housing cover disposed at an outermost front surface in a caulking manner. Accordingly, coupling between parts can be firmly achieved, and an axial gap between the parts can not be generated. In addition, since tolerance accumulation of the parts does not occur, inclination of a roller is reduced, so that collision noise of the roller can be prevented at the time of release operation.

Description

Technical Field

[0001] This invention relates to a continuously variable braking device installed on a car seat, and more specifically, to a continuously variable braking device for a car seat capable of maintaining or releasing the locked state of an adjustable height seat. Background Technology

[0002] The continuously variable braking system (CVT) of a car seat is part of the seat height adjustment system. The seat has an upward-moving unit that, when unlocked, will always move upward unless an external force is applied downwards. The CVT maintains the seat in a locked state by resisting the movement of the upward-moving unit and the passenger's weight, and releases the seat lock as needed.

[0003] like Figure 1 As shown, the continuously variable braking device for a car seat according to the prior art includes a housing 200, an input part 300, a control part 400, a fixing part 500, a braking part 600, a braking component 700, and a cover 800.

[0004] The input unit 300 is rotatably connected to one side of the housing 200, and the control unit 400 is disposed between the housing 200 and the input unit 300, elastically supported axially by a spring 440. An operating lever is disposed on the input unit 300 to allow the passenger to perform rotational operation.

[0005] The fixing part 500 and the cover 800 are combined on the other side of the housing 200, and the fixing part 500 and the cover 800 are fixed to the side of the seat cushion frame by bolts.

[0006] A braking part 600 with a toothed portion 610 is provided between the housing 200 and the cover plate 800. A braking member 700 composed of a roller 710 and an elastic member 720 is provided between the braking surface 620 of the braking part 600 and the inner peripheral surface 520 of the fixing part 500.

[0007] A wedge-shaped inclined surface 521 and a static friction surface 522 are formed on the inner peripheral surface 520 of the fixed part 500, thereby limiting or releasing the rotation of the braking part 600 according to the position of the roller 710.

[0008] On the other hand, when the input section 300 is rotated, the control section 400 compresses the spring 440 and moves to the housing 200 side according to its internal contact shape. At this time, the control protrusion 430 of the control section 400 pushes the roller 710 along the circumferential direction of the inner peripheral surface 520 of the fixing section 500. The roller 710 moves from the static friction surface 522 to the wedge slope 521, thereby releasing the state of the roller 710 restricting the braking section 600.

[0009] Therefore, the seat can be moved upward via the seat lifting unit, and in this state, the seat height can be adjusted as follows: if the passenger raises their buttocks, the seat rises accordingly, increasing the height; if the passenger sits down while bearing weight, the seat lowers, decreasing the height.

[0010] If the operating lever is released after the seat height is adjusted, the input unit 300 returns to the initial position, and the control unit 400 also returns to the input unit 300 side. As a result, the roller 710 returns to the static friction surface 522 and restricts the braking unit 600, which becomes a fixed state that cannot be rotated.

[0011] In the braking unit 600, since the gear tooth portion 610 formed on one side of the main body engages with the rack that is linked to the aforementioned seat lifting unit, as described above, when the rotation of the braking unit 600 is restricted, the seat lifting unit also becomes unable to move, thereby placing the seat in a locked state where it cannot move up or down. Therefore, the seat height adjusted by the passenger can remain constant.

[0012] On the other hand, such as Figure 2 As shown, in the existing continuously variable braking device described above, the input part 300 is connected to the housing 200 through hook structures 221 and 351. Therefore, the connection strength between the input part 300 and the housing 200 is low, resulting in a problem of reduced separation strength of the input part 300, i.e., reduced separation strength of the operating lever.

[0013] Furthermore, since multiple components such as the fixing part 500, housing 200, control part 400 and input part 300 are combined in a structure that is stacked in the axial direction, the dimensional tolerances of the components are accumulated. In addition, the dimensional tolerance of the bolt B used to combine the housing 200 with the fixing part 500 is also added. Therefore, the components cannot be precisely and securely combined, and the gap between the components may be too large, which results in the problem of the operating lever moving in the axial direction.

[0014] Furthermore, due to the component gaps generated as described above, the roller 710 also moves in the assembled state, therefore, as Figure 3 As shown, in the initial stage of the release operation, the roller 710 is tilted by the inclined surface 431 of the control protrusion 430. Figure 3 (a)), and when the release operation is completed, it returns to the normal state and collides with the cover 800, producing a "click" collision noise. Figure 3 (b) That is, there is a problem of operating noise whenever the user operates the continuously variable brake to adjust the seat height.

[0015] Existing technical documents

[0016] Patent documents

[0017] Patent Document 1: Korean Patent Publication No. 2021-0067586 (June 8, 2021) Summary of the Invention

[0018] Technical problems to be solved

[0019] The present invention is proposed to solve the problems mentioned above, and its purpose is to provide a continuously variable braking device for automobile seats. This device improves the release strength of the operating lever, prevents the operating lever from moving along the axial direction, and does not generate operating noise when releasing the operation.

[0020] Problem-solving methods

[0021] To achieve the above objectives, the present invention is characterized in that an input component and an unlocking component are provided on one side of the housing, and a braking component, a fixing component, and a gear component are provided on the other side of the housing. A housing cover surrounding the input component is provided on one side of the housing, and a plate cover preventing the braking component and the gear component from disengaging is provided on the other side of the housing. When the housing cover and the plate cover are pressurized in a direction facing each other, a plurality of connecting pieces formed on the plate cover are connected to the housing cover in a filling manner.

[0022] A pair of filling protrusions are formed at the end of the connecting piece, and the same number of locking platform pairs as the connecting piece are formed on the outer peripheral surface of the housing cover. Locking surfaces are formed at an incline on the inner side of the locking platforms on both sides of the pair. The connecting piece is inserted between the locking platforms on both sides, and the filling protrusions on both sides fill in the opening direction and lock onto the corresponding locking surfaces.

[0023] A protrusion is formed on the outer peripheral surface of the housing, and the connecting piece is engaged with the protrusion in the circumferential direction.

[0024] The unlocking component has multiple unlocking protrusions formed axially around the main body. The two corners of the ends of the unlocking protrusions are formed as inclined surfaces, and circular grooves that are recessed inward are formed on each inclined surface.

[0025] A straight guide groove is formed on the outer side of the unlocking component along the direction of movement of the unlocking component, and a straight guide protrusion inserted into the guide groove is formed on the inner side of the edge of the housing.

[0026] A stop protrusion is formed on the front side of the input component, and an arc-shaped stop hole is formed on the front side of the housing cover. The stop protrusion is inserted into the stop hole to limit the rotation range of the input component.

[0027] The inner circumferential surface of the fixing component is formed with a wedge surface and a release surface in a continuous and repetitive manner. The radius distance between the wedge surface and the center is relatively short, and the radius distance between the release surface and the center is longer than that of the wedge surface.

[0028] Invention Effects

[0029] As described above, according to the present invention, when all components are pressurized axially, the mating piece of the cover is filled into the housing cover to achieve assembly, thereby improving the bonding strength of the input part and the disengagement strength of the operating lever.

[0030] In addition, since no gaps are generated between the components due to the above assembly method, the axial movement of the operating lever is prevented.

[0031] In addition, for the same reason, the movement of the roller is prevented so that the roller will not tilt when the operation is released, thus preventing the roller from colliding with the cover and generating noise. Attached Figure Description

[0032] Figure 1 This is an exploded perspective view of a continuously variable braking device for a car seat based on existing technology.

[0033] Figure 2 yes Figure 1 A cross-sectional view of the assembly state.

[0034] Figure 3 (a) and Figure 3 (b) is a diagram illustrating the motion of the roller that causes collision noise during the release operation.

[0035] Figure 4 This is an exploded perspective view of a continuously variable braking device for a car seat according to the present invention.

[0036] Figure 5 yes Figure 4 A cross-sectional view of the assembly state.

[0037] Figure 6 Is as Figure 5 The bottom view shows the panel cover removed.

[0038] Figure 7 (a) and Figure 7 (b) is a diagram showing the combined structure of the plate cover and the shell cover.

[0039] Figure 8 This is a front perspective view of the continuously variable braking device according to the present invention.

[0040] Figure 9 This is a perspective view of the rear of the continuously variable braking device according to the present invention.

[0041] Figure 10 This is a perspective view of the unlocking component and the braking component as components of the present invention.

[0042] Figure 11 yes Figure 10Enlarged view of the unlocking protrusion and the two side rollers in contact with the unlocking protrusion.

[0043] Figure 12 This is a cross-sectional view of the assembly of the aforementioned unlocking protrusion and the housing.

[0044] Explanation of reference numerals in the attached figures

[0045] 10: Housing 16a: Guide protrusion

[0046] 20: Input component 30: Unlock component

[0047] 32: Unlock protrusion 32b: Circular groove

[0048] 32c: Guide groove; 40: Fixed component

[0049] 50: Gear components; 60: Braking components

[0050] 70: Plate cover; 71: Connecting piece

[0051] 72: Stuffing protrusion; 90: Shell cover

[0052] 92: Stopping platform; 92a: Stopping surface Detailed Implementation

[0053] This invention can be modified in many ways and can have many embodiments, with specific embodiments illustrated in the accompanying drawings for detailed description. However, this is not to limit the invention to the specific implementation, but should be understood to include all modifications, equivalents, and substitutions encompassed within the spirit and technical scope of the invention. For clarity and convenience, the thickness of lines and the dimensions of elements illustrated in the drawings may be exaggerated.

[0054] Furthermore, the terms used below are defined in consideration of the functionality of this invention and may vary depending on the user's or operator's intent or habits. Therefore, the definitions of these terms should be determined based on the entire contents of this specification.

[0055] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0056] like Figures 4 to 6 As shown, the continuously variable braking device for a car seat of the present invention includes a housing 10, an input component 20, an unlocking component 30, a fixing component 40, a gear component 50, a braking component 60, a plate cover 70, and a housing cover 90.

[0057] Based on the housing 10, the release operation part is composed of input component 20 and unlocking component 30 on one side, and the braking part is composed of fixing component 40, gear component 50, braking component 60, etc. on the other side.

[0058] The aforementioned release operation unit releases the locking state of the brake unit based on the user's operation of the lever (not shown). The aforementioned brake unit maintains the locking state against the user's weight and the seat upward movement unit, thereby keeping the seat height in the previously adjusted state.

[0059] The aforementioned cover 70 and housing cover 90 are the outermost components of the continuously variable brake device, and the components constituting the aforementioned release operation part and braking part are housed between them, preventing the components from detaching to the outside.

[0060] The input component 20 is a generally cylindrical component, and a mounting hole 21a is formed in the central boss 21, allowing the operating lever to be mounted by a fastening device such as a bolt. Locking portions 22 are formed protruding from opposite positions on the outer circumferential surface, so that after rotation by the operating lever, the lever returns to its initial position via a first spring 81.

[0061] The aforementioned unlocking component 30 is inserted inside the input component 20 and moves axially back and forth in conjunction with the rotation of the unlocking component 30. For this purpose, a trapezoidal sliding groove 31 is formed on the upper surface of the unlocking component 30, and correspondingly, a trapezoidal sliding protrusion 23 is formed on the inner side of the input component 20. In the assembled state, the sliding protrusion 23 is inserted into the sliding groove 31. Therefore, when the input component 20 rotates, the inclined surface of the sliding protrusion 23 and the inclined surface of the sliding groove 31 slide against each other, thereby causing the unlocking component 30 to compress the second spring 82 while moving forward toward the housing 10.

[0062] On the aforementioned unlocking component 30, a plurality of unlocking protrusions 32 are formed at certain intervals along the circumferential direction toward the housing 10.

[0063] A cylindrical central boss 11 is formed protruding from the front surface of the housing 10, and one end of the second spring 82 is inserted into the outer periphery of the central boss 11. In this state, the other end of the second spring 82 provides elastic support to the unlocking component 30.

[0064] The aforementioned first spring 81 consists of a pair, left and right. A spring groove 12 is formed along the circumferential direction on the outer contour of the front surface of the housing 10 for inserting and installing the first spring 81. The locking part 22 of the input component 20 is locked to the end of the first spring 81. Therefore, when the input component 20 is rotated by operating the lever, the first spring 81 is compressed. When the operating force of the lever is removed, the restoring force of the first spring 81 returns the input component 20 to the initial position.

[0065] The aforementioned fixed component 40, together with the gear component 50, forms the installation and operation space for the braking component 60.

[0066] The fixing member 40 is disposed close to the other side (rear surface) of the housing 10, and a wedge surface 41a and a release surface 41b are continuously and repeatedly formed on the inner circumferential surface 41 in the circumferential direction. The radius of the wedge surface 41a from the center of the inner circumferential surface 41 is relatively smaller than that of the release surface 41b, and the radius of the release surface 41b from the center of the inner circumferential surface 41 is relatively larger than that of the wedge surface 41a.

[0067] The gear component 50 forms a disc-shaped brake portion 52 on one side of the outer periphery of the shaft 51, and a pinion 53 is formed on one side of the brake portion 52. The pinion 53 meshes with a rack that is linked to the seat lifting unit.

[0068] One end of the shaft 51 of the gear component 50 is inserted into and mounted in the through hole of the central boss 11 of the housing 10 through the fixing member 40. At this time, the braking part 52 of the gear component 50 is located inside the through hole of the fixing member 40. Therefore, a space for mounting and operating the braking member 60 is formed between the inner peripheral surface 41 of the through hole of the fixing member 40 and the outer peripheral surface of the braking part 52 of the gear component 50.

[0069] Multiple braking components 60 are inserted and disposed in the installation and operation space of the aforementioned braking component 60. Each braking component 60 includes a spring 61 and rollers 62 disposed at both ends of the spring 61. The spring 61 is disposed at the center of the release surface 41b of the inner circumferential surface 41 of the fixing component 40, and rollers 62 are disposed at both ends of the spring 61 in contact with each other.

[0070] In the normal state where no passenger operating force is applied, the continuously variable braking device is in a locked state, and the rollers 62 on both sides are pushed by the springs 61 and clamped between the outer peripheral surface of the braking part 52 and the wedge surface 41a. As described above, since all rollers 62 are located on the wedge surface 41a and the braking part 52 is fixed, the gear component 50 is kept in a state where it cannot rotate.

[0071] The cover 70 is fitted snugly to the other side of the fixing member 40. The pinion 53 of the gear member 50 can protrude in the opposite direction through the through hole of the cover 70 and mesh with the rack, and the braking part 52 is locked in the periphery of the through hole of the cover 70. Therefore, the cover 70 prevents the gear member 50 and the braking part 60 from disengaging.

[0072] On the other hand, a housing cover 90 is provided on the front side of the input component 20. The housing cover 90 is a circular container component that is closed on one side, and the input component 20 is inserted from the open side.

[0073] A boss hole 91 is formed on the front of the housing cover 90 for inserting and mounting the central boss 21 of the input component 20. The central boss 21 is exposed to the outside of the housing cover 90 through the boss hole 91, thereby enabling the mounting of the operating lever.

[0074] The aforementioned cover plate 70 has a plurality of connecting pieces 71 that bend and extend toward the housing cover 90. For example... Figure 7 As shown in Figure a, two caulking protrusions 72, spaced apart by a predetermined interval, are formed at the end of the connecting piece 71.

[0075] Corresponding to the aforementioned plugging protrusions 72, a pair of locking platforms 92, the same number as the connecting pieces 71, are formed on the outer peripheral surface of the housing cover 90. These locking platforms 92 are spaced apart from each other by the width of the connecting pieces 71. On both sides of each pair of locking platforms 92, locking surfaces 92 with an inclined shape facing each other are formed.

[0076] like Figure 5 As shown, after the assembly of other components is completed, the cover 70 and the housing cover 90 are pressurized in a direction facing each other. In this state, the aforementioned filling protrusions 72 fill and open to both sides, thereby being locked onto the locking surface 92a of the locking platform 92 of the housing cover 90 (see...). Figure 7 (b)). The cover 70 is made of metal. The filling protrusion 72 is plastically deformed by filling and remains open to both sides, so that it is firmly and stably held in place by the locking surface 92a.

[0077] At this time, since the connecting piece 71 is inserted between the two locking platforms 92, relative movement in the circumferential direction between the plate cover 70 and the housing cover 90 can also be prevented. In addition, a protrusion 13 is also formed on the outer circumferential surface of the housing 10, so that the connecting piece 71 is locked in the circumferential direction, thereby making the housing 10, the plate cover 70 and the housing cover 90 firmly connected to each other without moving in the circumferential direction.

[0078] Figure 8 and Figure 9 The image shows a perspective view of the front and back of the continuously variable braking device assembled as described above.

[0079] On the housing 10, the fixing component 40, and the cover 70, a plurality of mounting portions 14, 42, and 73 protruding outward in the radial direction are formed at the same position. Each mounting portion 14, 42, and 73 has a bolt hole, and they are aligned with each other during assembly.

[0080] Therefore, mounting parts 14, 42, and 73 can be installed on the seat cushion frame using bolts.

[0081] The input component 20 is provided with a pair of stop protrusions 24, which are spaced equidistant from the central boss 21 in the radial direction. Each stop protrusion 24 is formed on opposite sides of the central boss 21.

[0082] The aforementioned housing cover 90 has a stop hole 93 for the insertion of the aforementioned stop protrusion 24. The stop hole 93 is formed as an arc with a predetermined length on the same circumference centered on the boss hole 91. Since the aforementioned stop protrusion 24 can only move inside the stop hole 93, the rotation angle of the input component 20 is limited to the length range in the circumferential direction of the stop hole 93. That is, the operating range of the operating lever is limited to a predetermined range, thereby preventing unnecessary over-operation of the operating lever, thereby enabling the forward and backward movement of the unlocking component 30 to be realized smoothly and stably.

[0083] On the other hand, such as Figure 10 and Figure 11 As shown, the unlocking protrusions 32 of the unlocking component 30 are formed in the same number as those of the braking component 60 and are located between the braking components 60.

[0084] The end of the unlocking member 30 is shaped such that it can be easily inserted between the rollers 62 of the braking members 60 on both sides, and the width becomes narrower as it approaches the end. That is, the two corners of the end are formed as inclined surfaces 32a.

[0085] In addition, a circular groove 32b is formed on the inclined surface 32a in a recessed direction toward the inward side of the inclined surface 32a. The circular groove 32b has a radius of curvature that is the same as or slightly larger than the radius of curvature of the outer peripheral surface of the roller 62.

[0086] In addition, such as Figure 12 As shown, a straight guide groove 32c is formed on the outer surface of the unlocking protrusion 32 (the outer surface of the unlocking component 30 in the radial direction) along the direction of movement of the unlocking protrusion 32. Of course, the guide groove 32c can extend through the entire body of the unlocking component 30.

[0087] On the inner circumferential surface of the edge portion 16 of the main body of the housing 10, a straight guide protrusion 16a is formed, corresponding to the guide groove 32c, protruding along the axial direction of the housing 10.

[0088] In the assembled state, the aforementioned guide protrusion 16a is inserted into the guide groove 32c of the unlocking protrusion 32, thereby guiding the linear movement of the unlocking component 30.

[0089] exist Figure 12 In the figure, the unspecified reference numeral 15 is a protrusion hole 15 through which the aforementioned unlocking protrusion 32 passes. Through this protrusion hole 15, the unlocking protrusion 32 protrudes toward the back side of the housing 10, thereby enabling the operation of the braking component 60.

[0090] The effects of the continuously variable braking device according to the present invention will be explained below.

[0091] When a passenger operates the control lever, the input component 20 connected to the control lever rotates, and the unlocking component 30 moves toward the housing 10 by the action of the sliding protrusion 23 of the input component 20 and the sliding groove 31 of the unlocking component 30.

[0092] Therefore, when the unlocking protrusion 32 of the unlocking component 30 moves, the roller 62 is pushed and moves from the wedge surface 41a to the release surface 41b, thereby releasing the fixed state of the roller 62 on the gear component 50.

[0093] Therefore, passengers can adjust the seat height as needed. The seat cushion lifting gear component 50, used for adjusting seat height, remains in a free-rotating state.

[0094] Then, when the passenger completes the seat height adjustment and releases the operating lever, the unlocking component 30 and the input component 20 return to their original positions via the first spring 81 and the second spring 82. The operating lever installed on the input component 20 also returns to its original position. The roller 62 returns to the wedge surface 41a via the spring 61 and is inserted between the wedge surface 41a and the outer peripheral surface of the brake part 52, thereby fixing the gear component 50.

[0095] Therefore, the rack of the seat lifting unit that meshes with the pinion 53 of the gear component 50 is fixed, thereby converting the seat into a locked state where it cannot move up or down.

[0096] On the other hand, in the continuously variable braking device according to the present invention, the input component 20 is inserted into the inner side of the housing cover 90, and the housing cover 90 is restricted by the plate cover 70 by the connecting piece 71. Since the connecting piece 71 is provided at multiple positions along the outer periphery of the device to exert a strong bonding force, the detachment strength of the input component 20 is greatly improved, thereby reliably preventing the input component 20 from detaching. Therefore, axial detachment of the operating lever mounted on the input component 20 is reliably prevented.

[0097] Furthermore, after the components constituting the continuously variable braking device are stacked axially, the filling protrusion 72 at the end of the aforementioned connecting piece 71 is filled under pressure, so that even if there are errors in the size of the components, the tight fit between the components can be firmly maintained.

[0098] That is, the plugging protrusions 72, which are plastically deformed by plugging, keep the components of the device in a state of being pressurized on both sides of the axial direction, so that the components can still be kept in a tight fit even when the pressure applied during assembly is removed. Therefore, there is no axial clearance between the multiple components constituting the device, preventing the components from moving in the axial direction.

[0099] As described above, by employing a structure that eliminates gaps between components, the axial movement of the roller 62 installed inside the device is unaffected by the assembly state of other components, but only by the thickness tolerance of the fixed component 40. That is, since there is no tolerance accumulation caused by other components, the possibility of axial movement of the roller 62 is reduced. Therefore, in the initial stage of release, the tilt of the roller 62 is reduced, thereby reducing the collision noise between the roller 62 and the cover plate 70.

[0100] Furthermore, since a recessed circular groove 32b is formed on the inclined surface 32a of the aforementioned unlocking protrusion 32, the pushing amount at the corner of the roller 62 is reduced in the initial stage when the unlocking protrusion 32 begins to push the roller 62 in the circumferential direction. The circular groove 32b surrounds a part of the outer circumferential surface of the roller 62, thereby improving the posture stability of the roller 62 and further reducing the degree to which the roller 62 tilts in the compression direction of the spring 61.

[0101] Therefore, the impact of the roller 62 colliding with the cover plate 70 is further reduced, resulting in almost no collision noise.

[0102] On the other hand, in the unlocking component 30 described above, the unlocking protrusion 32 is inserted into the protrusion hole 15 of the housing 10 to guide its movement path. In addition, a guide groove 32c is formed on the outer surface of the unlocking protrusion 32, and a guide protrusion 16a formed on the edge portion 16 of the housing 10 is inserted into the guide groove 32c. Therefore, the unlocking protrusion 32 is prevented from moving in the circumferential direction or tilting relative to the movement direction of the guide protrusion 16a.

[0103] Therefore, the unlocking component 30 does not tilt in a radial direction relative to the central axis of the continuously variable braking device, but moves accurately along the axis, thus enabling smoother operation.

[0104] As described above, the present invention has been illustrated with reference to the embodiments shown in the accompanying drawings, but these are merely illustrative, and those skilled in the art should understand that various modifications and equivalent embodiments can be implemented as a result. Therefore, the true scope of protection of the present invention should be determined by the claims.

Claims

1. A stepless brake device for an automobile seat, an input member and an unlocking member are provided on one side of a housing, and a brake member, a fixing member, and a gear member are provided on the other side of the housing, a housing cover that surrounds the input member is provided on one side of the housing, a plate cover that prevents the brake member and the gear member from coming off is provided on the other side of the housing, a plurality of coupling pieces formed on the plate cover are coupled to the housing cover in a packed manner in a state where the housing cover and the plate cover are pressed in directions facing each other, the brake member includes a spring and rollers provided at both ends of the spring, the unlocking member has a plurality of unlocking protrusions formed in an axial direction around a main body of the unlocking member, both side corners of end portions of the unlocking protrusions are formed as inclined surfaces, and a circular groove recessed inward is formed in each inclined surface, the circular groove surrounds a portion of an outer peripheral surface of the roller.

2. The stepless brake device for an automobile seat according to claim 1, wherein a pair of packing protrusions is formed at end portions of the coupling pieces, a same number of pairs of locking steps as the coupling pieces are formed on an outer peripheral surface of the housing cover, locking surfaces are formed in an inclined manner on inner side portions of the pairs of locking steps on both sides, the coupling pieces are inserted between the pairs of locking steps on both sides, and the pair of packing protrusions are packed to the pairs of locking steps on both sides in a direction in which the pairs of locking steps are spread apart and are locked to corresponding locking surfaces.

3. The stepless brake device for an automobile seat according to claim 2, wherein a protruding portion is formed on an outer peripheral surface of the housing, and the coupling pieces are locked on the protruding portion in a circumferential direction.

4. The stepless brake device for an automobile seat according to claim 1, wherein a linear guide groove is formed on an outer side surface of the unlocking member in a direction of movement of the unlocking member, and a linear guide protrusion that is inserted into the guide groove is formed on an inner side surface of a rim portion of the housing.

5. The stepless brake device for an automobile seat according to claim 1, wherein a stop protrusion is formed on a front surface of the input member, an arc-shaped stop hole is formed on a front surface of the housing cover, and the stop protrusion is inserted into the stop hole, thereby limiting a range of rotation of the input member.

6. The stepless brake device for an automobile seat according to claim 1, wherein a wedge surface and a release surface are formed in a continuously repeated manner on an inner peripheral surface of the fixing member, the wedge surface is relatively short in distance from a center, and the release surface is longer in distance from the center than the wedge surface.

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