Fitness bike and brake device thereof

Abstract

The present invention discloses an exercise bicycle and a brake device thereof. The present invention provides a brake device for an exercise bicycle comprising: a brake lever; a brake cable connected to the brake lever so as to be pulled by the brake lever; and a brake holder connected to the brake cable.

Description

Technology Field

[0001] The present invention relates to an exercise bicycle and a brake device thereof that can forcibly brake the flywheel even when power is not supplied or the exercise bicycle is not in use. Background Technology

[0002] Generally, exercise bikes are used as indoor exercise equipment to strengthen muscles. Exercise bikes allow users to exercise as the wheels rotate through the motion of pedaling. These exercise bikes can be classified into spinning bikes, which allow for spinning exercises, and indoor bikes, which rotate the wheels by pedaling in the forward direction like a regular bicycle.

[0003] Spinning bikes utilize a non-freewheel structure due to the nature of exercising by pedaling, while indoor bikes utilize a freewheel structure.

[0004] In the non-freewheel structure applied to spinning bikes, power is transmitted to the wheel and rotates in both forward and reverse directions when the pedals are rotated.

[0005] In addition, the freewheel structure applied to indoor bicycles transmits power to the wheel and causes it to rotate when the pedal is rotated in the forward direction. However, when the pedal is stopped or rotated in the reverse direction, power is not transmitted to the wheel, so the wheel does not rotate.

[0006] Korean Registered Patent Publication No. 2304923 (published September 24, 2021) discloses an indoor exercise bicycle including an electronic brake. In the indoor exercise bicycle, a lead screw and a brake shoe move as the brake motor drives the wheel to brake. However, this electronic brake device cannot brake the wheel when power is not supplied to the brake motor. Furthermore, even if an external force is applied to the wheel and it rotates when the indoor exercise bicycle is not in use, the wheel cannot be forcibly braked. Consequently, the wheel of the indoor exercise bicycle may rotate unintentionally, potentially causing injury to the user, infant, or pet.

[0007] In addition, Korean Published Patent Application No. 2007-0038634 (published April 11, 2007) discloses a bicycle-type exercise machine. The brake unit of the bicycle-type exercise machine is disclosed to have a configuration that controls the load applied to the wheel member and brakes the wheel member as an electromagnetic field is generated in an interfering fluid contained in a housing. However, this brake unit also cannot brake the wheel member when power is not supplied. Consequently, the wheel member of the bicycle-type exercise machine may rotate unintentionally, causing injury to the user, infant, or pet.

[0008] Therefore, technology to brake the wheels is required when power is not supplied to the bicycle or exercise equipment, or when the bicycle or exercise equipment is not in use. The problem to be solved

[0009] The present invention was devised to solve the aforementioned problems and aims to provide an exercise bicycle and a brake device therewith capable of forcibly braking the flywheel even when power is not supplied or the exercise bicycle is not in use.

[0010] The present invention aims to provide an exercise bicycle and a brake device thereof, wherein the flywheel can be quickly braked when a user pulls and rotates the brake lever during exercise.

[0011] The present invention aims to provide a bicycle capable of braking a flywheel by applying magnetic force and frictional force to the flywheel, and a brake device thereof.

[0012] The present invention aims to provide an exercise bicycle and a brake device thereof, wherein the braking time of the flywheel can be shortened and the braking force can be increased.

[0013] The present invention aims to provide an exercise bicycle and a brake device thereof that can improve braking responsiveness. means of solving the problem

[0014] To solve the above-mentioned problem, the present invention provides a brake device for an exercise bicycle comprising: a brake lever; a brake cable connected to the brake lever so as to be pulled by the brake lever; and a brake holder connected to the brake cable.

[0015] The above brake holder can brake the flywheel by applying magnetic force and frictional force to the flywheel.

[0016] The brake holder may include a magnet portion installed in the holder body portion to apply magnetic force to the flywheel; and a friction member installed in the holder body portion to apply frictional force to the flywheel.

[0017] The holder body may include: a holder head portion corresponding to the rim portion of the flywheel, on which the hinge portion is installed; and a pair of retainer portions extending from the bracket body portion to face both sides of the rim portion.

[0018] The friction member can be disposed in the holder head portion.

[0019] The above magnet part can be placed in each of a pair of retainer parts.

[0020] The above magnet part can be installed to protrude from the above retainer part.

[0021] The above magnet portion may include a first magnet portion disposed in a retainer portion on one side; and a second magnet portion disposed in a retainer portion on the other side.

[0022] The first magnet part and the second magnet part may have the same polarity.

[0023] The first magnet part and the second magnet part may have opposite polarities.

[0024] The hinge portion may include a hinge shaft portion that penetrates the holder body portion and is positioned perpendicular to the pulling direction of the brake cable; and a hinge supporter portion that supports both sides of the hinge shaft portion.

[0025] The present invention provides an exercise bicycle comprising: a flywheel axially coupled to a rotating shaft and rotating in a freewheel mode and a non-freewheel mode; a stator installed on the frame and applying magnetic force to the flywheel to adjust the rotational load of the flywheel; a brake cable connected to the brake lever to be pulled by the brake lever; and a brake holder connected to the brake cable and applying magnetic force and frictional force to the flywheel to brake the flywheel.

[0026] The flywheel may include: a clutch bearing portion interposed between the rotating shaft portion and the wheel body portion; a clutch hub coupled to the rotating shaft portion; and a clutch portion movable in the axial direction of the clutch hub and restraining the clutch hub or restraining the clutch hub and the wheel body portion.

[0027] The above flywheel may include a clutch drive unit connected to the clutch unit to move the clutch unit.

[0028] The clutch portion may include: a clutch gear portion formed in the wheel body portion and disposed in the axial direction of the clutch hub; and a clutch sleeve connected to the clutch drive portion to engage with the hub gear portion of the clutch hub or to engage with the hub gear portion and the clutch gear portion.

[0029] The above stator may be positioned opposite the circumference of the wheel body to apply magnetic force to the wheel body to regulate the rotational load. Effects of the invention

[0030] According to the present invention, since the flywheel is braked by pulling the brake lever, the flywheel can be manually and forcibly braked even when power is not supplied or when the exercise bicycle is not in use.

[0031] According to the present invention, since the brake lever is hinge-coupled to the casing or spacer so as to be rotatable, the user can quickly brake the flywheel by pulling the brake lever during exercise.

[0032] According to the present invention, since the brake holder brakes the flywheel by means of magnetic force and friction, the braking time can be shortened and the braking force can be increased.

[0033] According to the present invention, since the flywheel is braked by magnetic force even before the brake holder contacts the flywheel, the braking responsiveness (braking speed) of the flywheel can be significantly improved.

[0034] According to the present invention, since the magnet part is made of a permanent magnet, the flywheel can be forcibly braked even if no separate power is supplied to the magnet part.

[0035] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0036] FIG. 1 is a schematic perspective view illustrating an exercise bicycle according to the present invention. Figure 2 is a side view schematically illustrating the internal structure of the exercise bicycle of Figure 1. Figure 3 is an exploded perspective view schematically illustrating the internal structure of the exercise bicycle of Figure 1. FIG. 4 is an exploded perspective view schematically illustrating the flywheel and stator of the exercise bicycle of FIG. 3. FIG. 5 is a cross-sectional view illustrating the state in which the clutch sleeve in the flywheel of FIG. 4 engages with the clutch hub and is driven in freewheel mode. FIG. 6 is a perspective view illustrating the state in which the clutch sleeve of the flywheel of FIG. 5 engages with the clutch hub and is driven in freewheel mode. FIG. 7 is a cross-sectional view illustrating the state in which power is transmitted in the freewheel mode of FIG. 5. FIG. 8 is a cross-sectional view illustrating the state in which the clutch sleeve in the flywheel of FIG. 4 engages simultaneously with the clutch hub and the clutch gear portion to operate in a non-freewheel mode. FIG. 9 is a perspective view illustrating a state in which the clutch sleeve in the flywheel of FIG. 8 engages simultaneously with the clutch hub and the clutch gear portion to operate in a non-freewheel mode. FIG. 10 is a cross-sectional view illustrating the state in which power is transmitted in the non-freewheel mode of FIG. 8. FIG. 11 is a schematic side view illustrating a brake device for braking a flywheel of the present invention. FIG. 12 is an exploded perspective view schematically illustrating the brake device of the exercise bicycle of FIG. 11. FIG. 13 is a perspective view schematically illustrating a brake holder in the brake device of FIG. 11. FIG. 14 is a side view schematically illustrating the state in which the magnet part of the brake device of FIG. 12 applies magnetic force to the flywheel to decelerate the flywheel. FIG. 15 is a schematic side view illustrating the state in which a friction member applies frictional force to the flywheel to brake the flywheel in the brake device of FIG. 14. Specific details for implementing the invention

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0038] The present invention is not limited to the embodiments disclosed below, but can be modified and implemented in various different forms. The embodiments provided are merely intended to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. Accordingly, the present invention should be understood not to be limited to the embodiments disclosed below, but to include all modifications, equivalents, and substitutions that fall within the technical spirit and scope of the present invention, as well as substituting or adding the configuration of any one embodiment with the configuration of another embodiment.

[0039] The attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; rather, it should be understood that they include all modifications, equivalents, and substitutions that fall within the spirit and technical scope of the invention. In the drawings, components may be depicted as being exaggeratedly large or small in size or thickness for the sake of convenience of understanding, but the scope of protection of the invention should not be interpreted restrictively as a result thereof.

[0040] The terms used in this specification are used merely to describe specific embodiments or examples and are not intended to limit the invention. Furthermore, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "includes" or "consists of" in this specification are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this specification. That is, terms such as "includes" or "consists of" in this specification should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0041] Terms including 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 are used solely for the purpose of distinguishing one component from another.

[0042] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0043] When it is stated that one component is "above" or "below" another component, it should be understood that it is not only placed directly above the other component, but that another component may also exist in between.

[0044] 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.

[0045] Hereinafter, an exercise bicycle according to an embodiment of the present invention will be described.

[0046] FIG. 1 is a schematic perspective view illustrating an exercise bicycle according to the present invention, FIG. 2 is a schematic side view illustrating the internal structure of the exercise bicycle of FIG. 1, and FIG. 3 is an exploded perspective view illustrating the internal structure of the exercise bicycle of FIG. 1.

[0047] Referring to FIGS. 1 to 3, an exercise bicycle (1) according to an embodiment of the present invention includes a brake device (200) capable of physically forcibly braking a flywheel (150) without a separate power supply. The brake device (200) forcibly brakes the flywheel (150) when power is not supplied or when the exercise bicycle (1) is not in use.

[0048] An exercise bicycle (1) includes a frame portion (120). A base portion (113) is installed on the lower side of the frame portion (120) to support the frame portion (120). The base portion (113) may be formed in the shape of a plate connected to the lower side of the frame portion (120). This base portion (113) may be formed in various shapes.

[0049] The frame section (120) includes a first frame (121) that supports the drive shaft section (133) and a second frame (122) that supports the rotation shaft section (140). The first frame (121) and the second frame (122) are connected to each other to support the exercise bicycle (1). This frame section (120) can be formed in various structures depending on the load distribution and structure of the exercise bicycle (1).

[0050] A casing (110) is installed to cover the outer side of the frame section (120). The frame section (120), flywheel (150), brake device (200), etc. are installed inside the casing (110). Circular disc hole sections (111) are formed on both the left and right sides of the casing (110). A rotating disc (131) is installed in the disc hole sections (111). The rotating disc (131) is formed in the shape of a circular panel. The frame section (120) and the rotating disc (131) shield the frame section (120), flywheel (150), brake device (200), etc. from the outside. Accordingly, access by users, infants, and pets can be blocked, thereby eliminating the possibility of injury. In addition, it can prevent external foreign matter from adhering to the parts of the frame section (120), flywheel (150), and brake device (200). This casing (110) forms the exterior of the exercise bicycle (1).

[0051] The center of a rotating disk (131) is connected to both sides of the drive shaft (133). A pedal (130) is connected to the circumference of each rotating disk (131). The pedal (130) of one rotating disk (131) and the pedal (130) of the other rotating disk (131) are arranged to form an angle of 180° in the radial direction of the drive shaft (133). When a user steps on the pedal (130), the rotating disk (131) rotates around the drive shaft (133).

[0052] The drive shaft (133) is installed to penetrate the center of the drive wheel (135). The drive wheel (135) and the pulley (143) of the rotation shaft (140), which will be described later, are connected by a power transmission unit (137), such as a belt or chain. When a user steps on the pedal (130), the rotation disk (131) rotates, and as the rotation disk (131) rotates, the drive shaft (133), the drive wheel (135), and the rotation shaft (140) rotate. Since the rotation disk (131) shields the disk hole (111), it is possible to prevent the user or infants from being injured even when the rotation disk (131) is rotated by stepping on the pedal (130). In addition, the rotation disk (131) shields the drive shaft (133) and the drive wheel (135), so that the internal parts of the exercise bicycle (1) are not visible from the outside. Accordingly, it is possible to prevent infants or pets from putting a part of their body into the casing (110) or entering the casing (110).

[0053] A spacer section (123) extends upward from the front side of the casing (110). The spacer section (123) is supported by the frame section (120). A stem (123) is coupled to the spacer section (123). A display section (127) may be positioned on the upper side of the stem (123). The display section (127) can output exercise information such as the speed and rotational load of the exercise bicycle (1). The stem (123) may be height-adjustably coupled to the spacer section (123). A handle (126) is connected to the upper side of the stem (123).

[0054] A seat housing portion (124) is installed inside the casing (110). The seat housing portion (124) is installed to penetrate the interior of the casing (110). The seat housing portion (124) may be positioned at an angle in the vertical direction of the casing (110). The seat housing portion (124) is positioned between the drive shaft portion (133) and the rotation shaft portion (140). This seat housing portion (124) may be formed in the shape of a polygonal pipe or a circular pipe.

[0055] A seat post (128) is positioned inside the seat housing portion (124). A seat (129) is installed on the upper side of the seat post (128). The seat post (128) can be installed in a height-adjustable manner inside the seat housing portion (124). Of course, the seat post (128) can be fixed inside the seat housing portion (124). The cross-section of the seat post (128) can be formed in various ways depending on the shape of the seat housing portion (124).

[0056] Since the above-mentioned stem (123) is installed height-adjustably on the spacer (123) and the seat post (128) is installed height-adjustably on the seat housing (124), the height of the handle (126) and the seat (129) can be appropriately adjusted according to the user's height, physical condition, or exercise tendency.

[0057] Meanwhile, in the exercise bicycle (1) according to the present invention, the flywheel (150) may be positioned on the rear side or the front side relative to the drive shaft (133). Depending on the installation position of the flywheel (150), the shape of the frame (120) and the casing (110) is changed. In addition, the positions of the drive shaft (133) and the rotation shaft (140) are also changed.

[0058] FIG. 4 is an exploded perspective view schematically illustrating the flywheel and stator of the exercise bicycle of FIG. 3; FIG. 5 is a cross-sectional view illustrating the state in which the clutch sleeve of the flywheel of FIG. 4 is engaged with the clutch hub and is driven in freewheel mode; FIG. 6 is a perspective view illustrating the state in which the clutch sleeve of the flywheel of FIG. 5 is engaged with the clutch hub and is driven in freewheel mode; FIG. 7 is a cross-sectional view illustrating the state in which power is transmitted in freewheel mode of FIG. 5; FIG. 8 is a cross-sectional view illustrating the state in which the clutch sleeve of the flywheel of FIG. 4 is engaged simultaneously with the clutch hub and the clutch gear section and is driven in non-freewheel mode; FIG. 9 is a perspective view illustrating the state in which the clutch sleeve of the flywheel of FIG. 8 is engaged simultaneously with the clutch hub and the clutch gear section and is driven in non-freewheel mode; and FIG. 10 is a cross-sectional view illustrating the state in which power is transmitted in non-freewheel mode of FIG. 8.

[0059] Referring to FIGS. 4 through 10, the rotation shaft portion (140) is installed in the frame portion (120) to receive power from the pedal (130) and rotate. A shaft (141) is installed inside the rotation shaft portion (140). Both sides of the shaft (141) are connected to the fork portion (121) of the frame portion (120) so as not to rotate. The rotation shaft portion (140) is fitted to the outside of the shaft (141). The rotation shaft portion (140) is installed to be concentric with the shaft (141). A shaft bearing (142) is installed between the shaft (141) and the rotation shaft portion (140). A pulley portion (143) is formed in the rotation shaft portion (140) to connect a power transmission portion (137), such as a belt or chain. Accordingly, when the rotation shaft portion (140) is rotated by the power transmission portion (137), the shaft (141) does not rotate.

[0060] The flywheel (150) is axially coupled to the rotational shaft portion (140) and rotates in freewheel mode and non-freewheel mode. The rotational shaft portion (140) is coupled to the rotational center of the flywheel (150).

[0061] The freewheel mode refers to an operating mode in which the flywheel (150) rotates when the rotating shaft (140) rotates in the forward direction, and the flywheel (150) does not rotate when the rotating shaft (140) rotates in the reverse direction. In the freewheel mode, when the rotating shaft (140) rotates in the reverse direction, the rotating shaft (140) idles on the flywheel (150).

[0062] The non-freewheel mode refers to an operating mode in which the flywheel (150) rotates in all cases where the rotating shaft (140) rotates in the forward direction or the reverse direction. In the non-freewheel mode, the rotating shaft (140) and the flywheel (150) are locked and rotate together.

[0063] The flywheel (150) includes a wheel body portion (151). The wheel body portion (151) is rotatably coupled to a rotation shaft portion (140). The wheel body portion (151) may be formed in the shape of a disc overall. The rotation shaft portion (140) passes through the center of the wheel body portion (151). A flange portion (152) may be formed around the periphery of the wheel body portion (151) to surround the stator (170), which will be described later. A rim portion (153) extending outward is formed in the flange portion (152). The rim portion (153) is formed in an annular shape along the circumferential direction of the flange portion (152). The wheel body portion (151) covers the outer side of the flywheel (150).

[0064] The clutch bearing portion (154) is interposed between the rotating shaft portion (140) and the wheel body portion (151). At this time, an annular seating groove (151a) in which the clutch bearing portion (154) is seated may be formed in the center of the wheel body portion (151). The seating groove (151a) is concentric with the rotating shaft portion (140) and the wheel body portion (151). The clutch bearing portion (154) is a one-way bearing that allows only one-way rotation of the rotating shaft portion (140). The clutch bearing portion (154) restrains the rotating shaft portion (140) and the wheel body portion (151) to rotate together when the rotating shaft portion (140) rotates in the forward direction, and when the rotating shaft portion (140) rotates in the reverse direction, only the rotating shaft portion (140) rotates and the wheel body portion (151) does not rotate. Accordingly, the clutch bearing portion (154) enables the freewheel mode of the flywheel (150) by rotating the flywheel (150) only when the rotating shaft portion (140) is rotated in the forward direction.

[0065] The clutch bearing portion (154) is formed with a structure in which a bearing (not shown) is interposed between an inner ring (not shown) and an outer ring (not shown). When the clutch bearing portion (154) rotates in one direction, the bearing restrains the inner ring and the outer ring, and when rotating in the other direction, the bearing releases the restraint between the inner ring and the outer ring. Various shapes of bearings, such as spherical shapes or circular rod shapes, can be applied. Various shapes of such clutch bearing portion (154) can be applied as long as the flywheel (150) rotates when the rotating shaft portion (140) rotates in the forward direction.

[0066] The clutch hub (155) is coupled to the rotating shaft portion (140). The clutch hub (155) is installed to be concentric with the rotating shaft portion (140). A hub gear portion (156) is formed on the circumference of the clutch hub (155). The hub gear portion (156) is an external gear formed along the outer surface of the clutch hub (155). The clutch hub (155) rotates together with the rotating shaft portion (140) around the rotating shaft portion (140), but is fixed to the rotating shaft portion (140) so as not to move in the axial direction of the rotating shaft portion (140). At this time, the rotating shaft portion (140) may be pressed into the center of the clutch hub (155) or gear-coupled to the center of the clutch hub (155). The clutch hub (155) may be formed in the shape of an annular disc.

[0067] The clutch unit (160) is positioned along the axial direction of the clutch hub (155) and is installed to restrain the hub gear unit (156) of the clutch hub (155) or to restrain the clutch hub (155) and the wheel body unit (151) simultaneously. When the clutch unit (160) restrains the clutch hub (155), power from the pedal (130) is transmitted to the rotating shaft unit (140), the clutch bearing unit (154), the clutch hub (155), and the clutch sleeve (163). However, power from the pedal (130) is not transmitted to the shift fork (166) and the clutch gear unit (162). Accordingly, the clutch bearing unit (155) is driven in a freewheel mode that restrains and rotates the flywheel (150) only when the rotating shaft unit (140) rotates in the forward direction.

[0068] Additionally, when the clutch unit (160) simultaneously restrains the clutch hub (155) and the wheel body unit (151), the power of the pedal (130) is transmitted to the rotating shaft unit (140), the clutch hub (155), the clutch bearing unit (155), the clutch sleeve (163), the clutch gear unit (162), and the wheel body unit (151). Accordingly, the device is driven in a non-freewheel mode that rotates the flywheel (150) when the rotating shaft unit (140) rotates in the forward and reverse directions.

[0069] The clutch portion (160) includes a clutch gear portion (162) and a clutch sleeve (163).

[0070] The clutch gear portion (162) is formed in the wheel body portion (151). At this time, the clutch gear portion (162) is formed to be concentric with the seating groove (151a) at the center of the wheel body portion (151). The clutch gear portion (162) and the hub gear portion (156) are arranged parallel to each other in the axial direction of the rotational shaft portion (140). The clutch gear portion (162) can be arranged on the same radius as the hub gear portion (156) with respect to the rotational shaft portion (140).

[0071] The clutch sleeve (163) is connected to a clutch drive unit (168) so as to engage with the hub gear unit (156) or engage with the hub gear unit (156) and the clutch gear unit (162). The clutch sleeve (163) is formed in an annular shape to be concentric with the clutch gear unit (162) and the hub gear unit (156). The inner surface of the clutch sleeve (163) includes a sleeve gear unit (164) formed in the shape of an internal gear to engage with the hub gear unit (156) and the clutch gear unit (162).

[0072] The sleeve gear portion (164) is moved along the axial direction of the rotational shaft portion (140) to engage only with the hub gear portion (156), or is moved along the axial direction of the rotational shaft portion (140) to engage simultaneously with the hub gear portion (156) and the clutch gear portion (162).

[0073] An annular shift fork (166) is coupled to the outer surface of the clutch sleeve (163). The shift fork (166) may be formed such that at least two unit shifts (not shown) surround the outer side of the clutch sleeve (163). At this time, an annular sleeve restraint portion (165) is formed along the circumferential direction of the clutch sleeve (163) on the outer surface of the clutch sleeve (163). An annular shift restraint portion (167) is formed on the inner surface of the shift fork (166) to be fitted into the sleeve restraint portion (165). The sleeve restraint portion (165) may be an annular restraint groove or a restraint projection. Additionally, the shift restraint portion (167) may be a locking groove or a locking projection that is fitted into the restraint groove or the restraint projection. The sleeve restraint portion (167) and the shift restraint portion (167) are restrained from each other in the axial direction, but rotate relatively freely in the circumferential direction of the rotational shaft portion (140). Accordingly, the shift fork (166) and the clutch sleeve (163) are restrained from each other so as to move together in the axial direction of the rotational shaft portion (140). However, the shift fork (166) does not rotate together with the clutch sleeve (163) when the clutch sleeve (163) rotates and remains in a stationary state.

[0074] The clutch drive unit (168) is connected to the clutch unit (160) to move the clutch unit (160). The clutch drive unit (168) is connected to the clutch sleeve (163) via a shift fork (166). The clutch drive unit (168) is fixed to the wheel body unit (151). The clutch drive unit (168) includes a motor unit (168a) and a ball screw unit (168b) connected to the drive shaft of the motor unit (168a). It goes without saying that various driving devices, such as a hydraulic cylinder, can be applied as the clutch drive unit (168) to move the clutch sleeve (163) in the axial direction of the rotation shaft unit (140).

[0075] The stator (170) is installed in the frame portion (120) to apply magnetic force to the flywheel (150) and to control the rotational load of the flywheel (150). The stator (170) is an electromagnet in which a coil (170b) is wound around an iron core (170a). As power is applied to the coil (170b), magnetic force is generated in the stator (170). The magnetic force strength of the stator (170) can be controlled by adjusting the current applied to the coil (170b) of the stator (170).

[0076] As the rotational load of the flywheel (150) (magnetic strength of the stator (170)) increases, the pedaling force of the pedal (130) increases, and as the rotational load of the flywheel (150) (magnetic strength of the stator (170)) decreases, the pedaling force of the pedal (130) decreases. Accordingly, the user's pedaling force can be adjusted by controlling the rotational load of the flywheel (150) by controlling the magnetic strength of the stator (170).

[0077] The stator (170) is fixed to the frame portion (120) so as not to rotate together with the flywheel (150). At this time, the stator (170) is fixed to the fixed cover (171), and the fixed cover (171) is fixed to the frame portion (120). The fixed cover (171) is positioned opposite the wheel body portion (151), and the stator (170) is positioned along the perimeter between the fixed cover (171) and the wheel body portion (151). The fixed cover (171) can be fixed to the frame portion (120) by fastening members (not shown), such as bolts or rivets. A rotating shaft portion (140) and a shaft (141) are installed to pass through the center of the fixed cover (171).

[0078] An annular wheel bearing portion (174) may be installed between the fixed cover (171) and the wheel body portion (151). At this time, an annular outer support rib (173) may be formed on the inner side of the stator (170) in the fixed cover (171). An annular inner support rib (157) may be formed annularly on the inner side of the outer support rib (173) in the wheel body portion (151). A wheel bearing portion (174) is interposed between the inner support rib (157) and the outer support rib. Accordingly, the wheel body portion (151) can rotate relative to the fixed cover (171). Furthermore, the fixed cover (171) and the stator (170) do not always rotate regardless of the rotation of the wheel body portion (151) in freewheel mode and non-freewheel mode.

[0079] The stator (170) may be positioned opposite the flywheel (150). The stator (170) and the flywheel (150) may face each other and have an overall circular disc shape. The stator (170) is arranged in an annular shape along the circumferential direction on the periphery of the fixed cover (171). At this time, the stator (170) may be positioned between the periphery of the fixed cover (171) and the periphery of the flywheel (150), that is, inside the outer surface of the periphery of the flywheel (150). Additionally, the stator (170) may be positioned outside the outer surface of the periphery of the flywheel (150). Furthermore, the stator (170) may be positioned concentrically with the rotational shaft (140). Additionally, the stator (170) may be positioned radially between the clutch portion (160) and the clutch hub (155). The stator (170) can be positioned at a certain distance in the axial direction of the rotation shaft portion (140) based on the radial direction of the clutch portion (160) and the clutch hub (155).

[0080] In this way, since the stator (170) is arranged annularly around the periphery of the fixed cover (171), the stator (170) can be formed as large as possible as the radius of the stator (170) is increased. Additionally, as the size of the stator (170) increases, the maximum magnetic force generated in the stator (170) can be increased, thereby increasing the adjustment range of the rotational load applied to the flywheel (150).

[0081] Additionally, when the stator (170) is positioned radially between the clutch portion (160) and the clutch hub (155), the installation thickness of the flywheel (150) and the stator (170) can be significantly reduced. Accordingly, the thickness of the flywheel (150) in the exercise bicycle (1) can be manufactured to be relatively thin, thereby narrowing the gap between the two pedals (130), and thus significantly improving the design freedom of the exercise bicycle (1).

[0082] FIG. 11 is a schematic side view illustrating a brake device for braking a flywheel according to the present invention, FIG. 12 is an exploded perspective view schematically illustrating a brake device of a bicycle according to FIG. 11, FIG. 13 is a schematic perspective view illustrating a brake holder of the brake device according to FIG. 11, FIG. 14 is a schematic side view illustrating a state in which a magnet part of the brake device according to FIG. 12 applies magnetic force to the flywheel to decelerate the flywheel, and FIG. 15 is a schematic side view illustrating a state in which a friction member of the brake device according to FIG. 14 applies frictional force to the flywheel to brake the flywheel.

[0083] Referring to FIGS. 11 to 15, a brake device (200) is installed on the frame part (120) to physically force brake the flywheel (150). The brake device (200) can manually force brake the flywheel (150) even when power is not supplied or when the exercise bicycle (1) is not in use.

[0084] The brake device (200) includes a brake lever (210), a brake cable (220), and a brake holder (230).

[0085] The brake lever (210) is installed in the casing (110) or the spacer (123). The brake lever (210) can be placed in various positions where it is within reach of the user's hand while sitting on the seat (129). Additionally, the brake lever (210) can be placed in a position where the user can quickly visually check it. Accordingly, the user can quickly pull the brake lever (210) while exercising to forcibly brake the flywheel (150).

[0086] The brake lever (210) can be hinged to the casing (110) or the spacer (123) so as to be rotatable. Accordingly, when the user pulls and rotates the brake lever (210) during exercise, the flywheel (150) can be braked quickly.

[0087] A brake cable (220) is connected to a brake lever (210) so as to be pulled by the brake lever (210). A brake lever (210) is connected to one side of the brake cable (220), and a brake holder (230) is connected to the other side of the brake cable (220). At this time, when the brake lever (210) is rotated at a certain angle, the brake cable (220) can be connected to the brake holder (230) and the brake lever (210) so that the brake holder (230) rotates in proportion to the rotation angle of the brake lever (210). Additionally, the rotation angle of the brake holder (230) can be adjusted according to the angle at which the brake cable (220) is connected to the brake holder (230).

[0088] The brake cable (220) can be movably installed on the roller section (222). The roller section (222) can be installed in various positions and numbers depending on the location or structure of the internal parts of the casing (110). For example, the number or location of the roller section (222) can be varied so that the brake cable (220) avoids the drive wheel (135) or the power transmission section (137).

[0089] A return section (224) may be installed to restore the brake cable (220) to its original position when no external force from the brake lever (210) is applied to the brake cable (220). The return section (224) may be connected to any one of the brake holder section (230), the brake cable (220), and the brake lever (210). A compression spring is provided as the return section (224).

[0090] The brake holder (230) is connected to the brake cable (220) and applies magnetic force and frictional force to the flywheel (150) to brake the flywheel (150). When the brake lever (210) is installed on the front side of the casing (110) or on the spacer part (123), the brake holder (230) may be positioned on the front side of the flywheel (150). The rotational speed of the flywheel (150) is decelerated by magnetic force until the brake holder (230) is separated from the flywheel (150) and comes into contact with the flywheel (150). After the brake holder (230) comes into contact with the flywheel (150), the flywheel (150) is braked by frictional force and magnetic force. Accordingly, when the brake holder (230) moves the same distance to brake the flywheel (150), the braking time can be shortened. Additionally, the braking force of the brake holder (230) can be increased by the sum of the magnetic force and the frictional force. Furthermore, since the flywheel (150) is braked by magnetic force even before the brake holder (230) contacts the flywheel (150), the braking responsiveness (braking speed) of the flywheel (150) can be significantly improved.

[0091] The brake holder (230) includes a holder body part (231), a hinge part (234), a magnet part (237), and a friction member (238).

[0092] The holder body portion (231) is connected to the brake cable (220) and positioned to correspond to the flywheel (150). The holder body portion (231) is positioned on the front lower side of the flywheel (150). The holder body portion (231) may be positioned spaced apart from the outer surface of the flywheel (150).

[0093] A hinge portion (234) is installed on the holder body portion (231) so that the holder body portion (231) can rotate. A hinge portion (234) is installed on the second frame (122) of the frame portion (120) to rotatably support the holder body portion (231).

[0094] The magnet portion (237) is installed in the holder body portion (231) to apply magnetic force to the flywheel (150). The magnet portion (237) may be positioned opposite the circumference of the flywheel (150). A permanent magnet may be used as the magnet portion (237). Accordingly, magnetic force can be applied to the flywheel (150) even without supplying a separate power source to the magnet portion (237).

[0095] A friction member (238) is installed on the holder body (231) to apply frictional force to the flywheel (150). The friction member (238) applies frictional force to the periphery of the holder body (231).

[0096] When the holder body part (231) rotates downward around the hinge part (234), the magnet part (237) and the friction member (238) are separated from the flywheel (150). When the holder body part (231) rotates upward around the hinge part (234), the magnet part (237) faces the flywheel (150), and the friction member (238) is pressed against the flywheel (150) to apply frictional force.

[0097] The magnet part (237) reduces the rotational speed of the flywheel (150) by magnetic force until it comes into contact with the flywheel (150) while separated from the flywheel (150). After the friction member (238) comes into contact with the flywheel (150), the friction member (238) applies frictional force to the flywheel (150) and the magnet part (237) applies magnetic force to the flywheel (150). The braking force of the flywheel (150) is the sum of the magnetic force and the frictional force. Accordingly, the braking time of the flywheel (150) is shortened, and the braking force of the brake holder (230) can be increased. In addition, since the flywheel (150) is braked by magnetic force from before the magnet part (237) comes into contact with the flywheel (150), the braking responsiveness (braking response speed) of the flywheel (150) can be significantly improved.

[0098] The holder body part (231) includes a holder head part (232) and a pair of retainer parts (233).

[0099] The holder head portion (232) is rotatably installed on the hinge portion (234) and corresponds to the outer circumference of the rim portion (153) of the flywheel (150). The holder head portion (232) is positioned on the front lower side of the rim portion (153).

[0100] A pair of retainer portions (233) extend from the holder body portion (231) so as to face both sides of the rim portion (153). A pair of retainer portions (233) may be formed on both sides of the holder body portion (231) with the same size. The holder head portion (232) and the pair of retainer portions (233) are formed in an approximately "∩" structure.

[0101] A friction member (238) is positioned on the inner side of the holder head portion (232). At this time, an inclined portion (232a) is formed on the inner side of the holder head portion (232), and a friction member (238) is installed at an angle on the inclined portion (232a). The friction member (238) can be attached to the inclined portion (232a) by an adhesive or fastened to the inclined portion (232a) by a fastening member. The friction member can be formed with a curvature identical to the curvature of the outer surface of the rim portion (153). The friction member (238) can be detachably installed on the inclined portion (232a). Accordingly, when the friction member (238) wears out, a new friction member (238) can be replaced on the inclined portion (232a).

[0102] The magnet portion (237) may be disposed on each of the pair of retainer portions (233). A fixing boss (233a) may be formed protrudingly on the inner side of the retainer portion (233) to fix the magnet portion (237). Accordingly, the pair of magnet portions (237) can apply magnetic force to both sides of the rim portion (153) to brake the flywheel (150).

[0103] The magnet portion (237) can be installed so as to protrude from the retainer portion (233). The magnet portion (237) can be formed in the shape of a cylinder, a polygonal column, or a flat plate. Since the magnet portion (237) is installed so as to protrude, the magnet portion (237) can be positioned closer to the rim portion (153) of the flywheel (150).

[0104] The magnet portion (237) may be installed so as to be embedded in the retainer portion (233). In this embedded type, the gap between the pair of retainer portions (233) is formed narrower than the structure in which the magnet portion (237) protrudes.

[0105] The magnet portion (237) may be pressed into the retainer portion (233) or fixed to the retainer portion (233) by an adhesive or a fixing structure. Additionally, the magnet portion (237) and the holder body portion (231) may be manufactured as a single unit by insert injection molding.

[0106] The magnet portion (237) may be formed by magnetizing the retainer portion (233). In this case, a part of the retainer portion (233) may be magnetized, or the entire retainer portion (233) may be magnetized. Additionally, the retainer portion (233) and the holder head portion (232) may be made entirely of a magnet material.

[0107] The magnet portion (237) may include a first magnet portion (237a) disposed on one side of the retainer portion (233) and a second magnet portion (237b) disposed on the other side of the retainer portion (233). The first magnet portion (237a) and the second magnet portion (237b) may have the same size and the same magnetic force. Additionally, the first magnet portion (237a) and the second magnet portion (237b) may be arranged facing each other or staggered from each other. When the first magnet portion (237a) and the second magnet portion (237b) apply the same magnetic force to the flywheel (150), it is possible to prevent the flywheel (150) from being twisted to one side by the magnetic force.

[0108] The first magnet part (237a) and the second magnet part (237b) may have the same polarity. Accordingly, the first magnet part (237a) and the second magnet part (237b) can brake the flywheel (150) by repulsion.

[0109] The first magnet part (237a) and the second magnet part (237b) may have opposite polarities. Accordingly, the first magnet part (237a) and the second magnet part (237b) can brake the flywheel (150) by means of attraction.

[0110] A portion of the first magnet part (237a) may have a positive electrode, and the remainder of the first magnet part (237a) may have a negative electrode. Additionally, a portion of the second magnet part (237b) may have a positive electrode, and the remainder of the second magnet part (237b) may have a negative electrode.

[0111] The hinge portion (234) includes a hinge shaft portion (235) and a hinge supporter portion (236).

[0112] The hinge shaft portion (235) penetrates the holder body portion (231) and is positioned perpendicular to the pulling direction of the brake cable (220). The hinge shaft portion (235) may be positioned parallel to the rotational shaft portion (140). The hinge support portion (236) supports both sides of the hinge shaft portion (235). The hinge support portion (236) is fastened to the frame portion (120). The hinge support portion (236) may be positioned perpendicularly to both sides of the holder head portion (232). This hinge portion (234) may be formed in various structures as long as it rotates the holder body portion (231) when the brake cable (220) is pulled.

[0113] When the brake cable (220) is pulled with the same force, the further the brake cable (220) is connected from the hinge shaft (235) in the holder body (231), the greater the pulling force of the brake cable (220).

[0114] When power is supplied to the above-mentioned exercise bicycle (1), the flywheel (150) can be braked by the magnetic force of the stator (170) when the brake lever (210) is manually operated. At this time, the magnetic force of the magnet part (237), the frictional force of the friction member (238), and the magnetic force of the stator (170) are applied to the flywheel (150) together, thereby allowing the flywheel (150) to be braked more quickly.

[0115] Additionally, when power is not supplied to the exercise bicycle (1), the flywheel (150) can be braked by manually operating the brake lever (210). At this time, the flywheel (150) can be braked as only the magnetic force of the magnet part (237) and the frictional force of the friction member (238) are applied to the flywheel (150).

[0116] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration according to the present invention were not explicitly described while describing the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized. Explanation of the symbols

[0117] 1: Exercise bike 110: Casing 111: Disc hole section 113: Base section 120: Frame section 121: First frame 122: 2nd Frame 123: Spacer 124: Seat housing 125: Stem 126: Handle 127: Display unit 128: Seat Post 129: Seat 130: Pedal 131: Rotating disc 133: Drive shaft section 135: Drive wheel 137: Power transmission unit 140: Rotating shaft unit 141: Shaft 142: Shaft bearing 143: Pulley 150: Flywheel 151: Wheel body part 151a: Seating groove 152: Flange section 153: Rim section 154: Clutch bearing section 155: Clutch hub 156: Hub gear section 157: Inner support rib 160: Clutch section 162: Clutch gear section 163: Clutch sleeve 164: Sleeve gear part 165: Sleeve restraint 166: Shift fork 167: Shift restraint unit 168: Clutch drive unit 0. 168a: Motor section 168b: Ball screw section 170: Stator 171: Fixed Cover 173: Outer support rib 174: Wheel bearing section 200: Brake device 210: Brake lever 220: Brake cable 222: Roller part 224: Restoration part 230: Brake holder 231: Holder body part 232: Holder head part 232a: Inclined section 233: Retainer section 233a: Fixed boss 234: Hinge part 235: Hinge shaft part 236: Hinge support part 237: Magnet section 237a: First magnet section 237b: Second magnet part 238: Friction member

Claims

Claim 1 A brake device for a bicycle, comprising: a brake lever installed in the casing or spacer portion of the bicycle; a brake cable connected to the brake lever so as to be pulled by the brake lever; and a brake holder connected to the brake cable and applying magnetic force and frictional force to the flywheel to brake the flywheel, wherein the flywheel comprises a wheel body portion rotatably coupled to the rotating shaft portion of the bicycle, a rim portion extending from the circumference portion of the wheel body portion, a clutch bearing portion interposed between the rotating shaft portion and the wheel body portion, a clutch hub coupled to the rotating shaft portion, a clutch portion movable in the axial direction of the clutch hub and restraining the clutch hub or restraining the clutch hub and the wheel body portion, and a clutch driving portion connected to the clutch portion to move the clutch portion, and wherein the brake holder applies magnetic force and frictional force to the rim portion. Claim 2 A brake device for an exercise bicycle according to claim 1, wherein the brake holder comprises: a holder body portion connected to the brake cable and positioned to correspond to the flywheel; a hinge portion installed on the holder body portion to allow the holder body portion to rotate; a magnet portion installed on the holder body portion to apply magnetic force to the rim portion; and a friction member installed on the holder body portion to apply frictional force to the rim portion. Claim 3 A brake device for an exercise bicycle according to claim 2, wherein the holder body part comprises: a holder head part corresponding to the rim part and having the hinge part installed thereon; and a pair of retainer parts extending from the holder head part so as to face both sides of the rim part. Claim 4 In paragraph 3, the friction member is a brake device for an exercise bicycle disposed in the holder head portion. Claim 5 A brake device for an exercise bicycle, wherein, in paragraph 3, the magnet portion is disposed in each of a pair of retainer portions. Claim 6 In paragraph 3, the brake device of an exercise bicycle, wherein the magnet portion is installed to protrude from the retainer portion. Claim 7 A brake device for an exercise bicycle, wherein, in paragraph 3, the magnet portion comprises: a first magnet portion disposed in a retainer portion on one side; and a second magnet portion disposed in a retainer portion on the other side. Claim 8 In claim 7, the brake device of a bicycle, wherein the first magnet part and the second magnet part have the same polarity. Claim 9 In claim 7, the brake device of a bicycle, wherein the first magnet part and the second magnet part have opposite polarities. Claim 10 A brake device for an exercise bicycle according to claim 2, wherein the hinge portion comprises: a hinge shaft portion penetrating the holder body portion and positioned perpendicular to the pulling direction of the brake cable; and a hinge supporter portion supporting both sides of the hinge shaft portion. Claim 11 A bicycle comprising: a frame portion supporting a rotating shaft portion and a spacer portion; a flywheel axially coupled to the rotating shaft portion and rotating in freewheel mode and non-freewheel mode; a stator installed on the frame portion and applying magnetic force to the flywheel to adjust the rotational load of the flywheel; a brake lever installed on a casing covering the frame portion or on the spacer portion; a brake cable connected to the brake lever to be pulled by the brake lever; and a brake holder connected to the brake cable and applying magnetic force and frictional force to the flywheel to brake the flywheel; wherein the flywheel comprises: a wheel body portion rotatably coupled to the rotating shaft portion; a clutch bearing portion interposed between the rotating shaft portion and the wheel body portion; a clutch hub coupled to the rotating shaft portion; a clutch portion movable in the axial direction of the clutch hub and restraining the clutch hub or restraining the clutch hub and the wheel body portion; and a clutch drive portion connected to the clutch portion to move the clutch portion. Claim 12 delete Claim 13 A bicycle according to claim 11, wherein the clutch portion comprises: a clutch gear portion formed in the wheel body portion and disposed in the axial direction of the clutch hub; and a clutch sleeve connected to the clutch drive portion so as to engage with the hub gear portion of the clutch hub or engage with the hub gear portion and the clutch gear portion. Claim 14 A bicycle according to claim 11, wherein the stator is positioned opposite the circumference of the wheel body to apply magnetic force to the wheel body to regulate the rotational load. Claim 15 In claim 11, the brake holder comprises: a holder body portion connected to the brake cable and positioned to correspond to the flywheel; a hinge portion installed in the holder body portion to allow the holder body portion to rotate; a magnet portion installed in the holder body portion to apply magnetic force to the flywheel; and a friction member installed in the holder body portion to apply frictional force to the flywheel; a bicycle for exercise. Claim 16 An exercise bicycle according to claim 15, wherein the flywheel further comprises a rim portion extending from the circumference of the wheel body portion; and the holder body portion comprises a holder head portion corresponding to the rim portion, on which the hinge portion is installed; and a pair of retainer portions extending from the holder head portion so as to face both sides of the rim portion. Claim 17 In claim 16, the friction member is disposed in the holder head portion, forming a bicycle. Claim 18 In Clause 16, the above-mentioned magnet portion is each disposed in a pair of retainer portions, forming an exercise bicycle. Claim 19 In claim 16, the above magnet part comprises: a first magnet part disposed in a retainer part on one side; and a second magnet part disposed in a retainer part on the other side; an exercise bicycle. Claim 20 In claim 19, the first magnet part and the second magnet part have the same polarity, a bicycle for motion. Claim 21 In claim 19, the first magnet part and the second magnet part have opposite polarities, forming a bicycle.

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