JP2015071324A - Power-assisted bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power-assisted bicycle equipped with a lock mechanism capable of: performing a key operation smoothly without obstructing the pedaling; and preventing an unintended disengagement of a battery box.SOLUTION: In a power-assisted bicycle having a battery box 1 removably mounted between a standing pipe 10 and a rear wheel 15, a key insertion port 5A of a key 32 for locking/unlocking operations in a lock mechanism 4 to retain the battery box 1 in a bicycle body is arranged on the left-hand side in the vehicle width direction of the standing pipe 10 and upward, so that most a rider can ride and fall from the left-hand side of the bicycle body without changing the visual line before getting-on the bicycle and after getting-off the bicycle and can visually confirm the key insertion port 5A of the lock mechanism 4 easily and can be prepared for the key operations for opening and closing the battery box 1 at all times. The rider can insert the key 32 promptly downward along the standing pipe 10 into the key insertion port 5A which can be visually confirmed easily from the getting-off standing position.

Description

  The present invention relates to an electrically assisted bicycle in which a battery box is detachably mounted between a standing pipe and a rear wheel. In particular, the present invention relates to an improvement of a lock mechanism when a battery box is mounted on a vehicle body.

  Conventionally, in bicycles, driving force is obtained by pedal depression, but pedaling with a load even when traveling on an uphill road with pedal depression for a long time or even on a flat road It required a lot of effort, especially for the elderly or women and women. Therefore, in recent years, electric bicycles and electric assist bicycles that do not require much physical strength have become widespread. A battery box that houses a battery having a relatively large capacity that is used to supply power for bicycle power as main power or auxiliary power is frequently attached to and detached from the vehicle body for charging. With regard to the mounting of these battery boxes on the vehicle body, from the viewpoint of preventing theft and dropping, the battery box is configured to be equipped with a lock mechanism so that unintentional removal cannot be easily performed while being easy to attach and detach. .

  As a lock mechanism in such a battery box mounting mechanism, an electric bicycle as a first conventional example as described in Patent Document 1 has been proposed. Such a conventional electric bicycle will be described with reference to FIG. 8. An electric motor for driving wheels and a battery unit 111 as a driving power source for the electric motor are provided, and the battery unit 111 includes a standing pipe 102 and a rear wheel 105. A key unit 132 having a lock mechanism for detachably locking one end of the battery unit 111 is positioned in front of the standing pipe 102. It is provided as follows.

  With such a configuration, the key unit 132 that locks the battery unit 111 is positioned not between the upper part of the battery unit 111 but in front of the vertical pipe 102 while the battery unit 111 is disposed between the vertical pipe 102 and the rear wheel 105. Since it is arranged on the side, the minimum height of the saddle 107 can be made lower, the foot can be improved and a stable stop is possible, and the arrangement of the key unit 132 is forward. Therefore, there is an advantage that the on / off operation of the electric switch is easy even when boarding.

  Similarly, as a bicycle using auxiliary power, an electric assist bicycle as a second conventional example as described in Patent Document 2 below has been proposed. Such a conventional electrically assisted bicycle will be described with reference to FIG. 9. When a recess 57 b is provided in a protruding portion 57 a in the vicinity of a mounting frame (standing pipe) 52 a on the upper part of the rear battery case 57 and the key 38 is turned, The protruding portion of the lock key 55 fixed to the 52a via the bracket 56 is configured to be fitted into the concave portion 57b to prevent the battery case 57 from being removed.

  With such a configuration, the battery can be locked while the battery is mounted at the center of gravity of the bicycle, thereby preventing theft.

Japanese Patent Laid-Open No. 10-230881 (see abstracts, etc.) Japanese Patent Laid-Open No. 11-105759 (see paragraph [0030] etc.)

  However, in the electric bicycle of the first conventional example, as clearly understood in FIG. 8B, the key unit 132 for locking / unlocking the battery unit 111 is also used as a power switch. The lock key 138 overlaps with the flat part of the saddle 107 in plan view, loses sight of the key insertion slot to be inserted, and the operation must be performed by detouring the lower part of the saddle 107 and inserting a finger. It became. Further, in the electric assist bicycle according to the second conventional example, the battery case 57 is distributed and arranged on the front side of the frame 52a which is a standing pipe, which is advantageous as a countermeasure for the center of gravity of the bicycle, but the lock key 55 of the battery case 57 is used. Is still located at the lower rear part of the saddle, and like the first conventional example, it overlaps with the flat part of the saddle in plan view, losing sight of the key insertion slot to be inserted, and the operation of the saddle It had to be done by inserting a finger around the lower rear part, which was troublesome. In addition, when a rear carrier or a rear child seat is attached, the operation is more complicated.

  Therefore, in the present invention, the lock mechanism that solves the problems in the lock mechanism of the conventional electric assist bicycle and the like, does not interfere with pedaling, can smoothly operate keys, and can prevent inadvertent removal of the battery box. An object of the present invention is to provide an electric assist bicycle equipped with

  For this reason, the present invention operates locking / unlocking in a lock mechanism that locks the battery box by locking the battery box to the vehicle body in a battery-assisted bicycle that is detachably mounted between the standing pipe and the rear wheel. The key insertion opening of the key is arranged on the left side in the vehicle width direction of the upright pipe and upward. Further, the present invention is characterized in that the key insertion port is arranged in front of the rear end portion of the standing pipe. Further, the present invention is characterized in that the key cylinder into which the key is inserted is disposed substantially along the standing pipe. Further, the present invention provides the above-mentioned lock mechanism, and is configured to hold the locking position of the locking portion with respect to the battery box in the key unlocked state, and to lock the locking portion according to the removal operation of the battery box. Is characterized in that Further, the present invention provides a common key for the lock mechanism and a key for the rear circle lock that prevents the rear wheel of the rear portion of the standing pipe from rotating, and the key insertion / removal direction of the lock mechanism and the key for the rear circle lock. The insertion / removal direction is oriented in a direction substantially along the vehicle body surface, and these are used as means for solving the problems.

  According to the present invention, in the battery-assisted bicycle having the battery box detachably mounted between the standing pipe and the rear wheel, the battery box is locked to the vehicle body and locked. Since the key insertion port of the key for operating the locking / unlocking in the locking mechanism is arranged on the left side in the vehicle width direction of the standing pipe and upward, it gets on and off from the left side of the vehicle body because it is left-hand traffic. For most passengers, the key insertion slot in the lock mechanism can be easily seen without changing the passenger's line of sight before and after getting off, and ready for key operation for attaching and detaching the battery box at any time In addition, the key can be quickly inserted from above along the standing pipe into the key insertion slot that can be easily seen from the standing position of the passenger getting off the vehicle.

  In addition, when the key insertion port is a constituent requirement according to claim 2 and is disposed in front of the rear end portion of the vertical pipe, the saddle height is normally lowered to a substantially central portion in the longitudinal direction of the saddle. Since the key insertion port of the lock mechanism is arranged at least in front of the upper end of the standing pipe that is tilted backward, the flat part of the saddle that is positioned on the extension line of the standing pipe and gradually decreases forward is the key. It can be seen from above regardless of the vertical position of the saddle without overlapping with the insertion slot, and it is not necessary to bypass and insert the fingers under the saddle. A key can be inserted into the key insertion slot. Furthermore, when the key cylinder into which the key is inserted is disposed substantially along the vertical pipe, the key is smoothly inserted into the key insertion opening by a guide operation along the vertical pipe. In addition, the key cylinder in the locking mechanism does not protrude so much in the left-right direction of the vehicle body from the standing pipe, so there is no possibility of interfering with the inside of the leg when pedaling.

  Furthermore, in the lock mechanism according to claim 4, wherein the lock mechanism is configured to hold the lock position of the lock portion with respect to the battery box in the key unlocked state, and the battery box is removed. If the locking part is unlocked according to the above, as described above, the key unlocking operation for removing the battery box can be easily performed without changing the posture when getting off, etc. By the way, it is possible to effectively prevent the battery box from being unlocked before taking the posture for removing the battery box. In addition, the key in the lock mechanism and the key in the rear circle lock that prevents the rear wheel of the rear portion of the standing pipe from rotating are common, and the key release in the lock mechanism is a constituent element described in claim 5. When the insertion direction and the key removal insertion direction in the rear circle lock are oriented in a direction substantially along the vehicle body surface, the lock mechanism in the battery box and the rear circle lock can be operated with one key. The key insertion / removal direction is oriented in a direction substantially along the vehicle body surface, so that the insertion / removal of keys between the key insertion ports arranged close to each other can be performed in the same plane. It can be done quickly and smoothly with a minimum of

It is explanatory drawing which shows the attachment state of the lock mechanism in the electrically assisted bicycle of this invention. FIG. 2 illustrates a lock mechanism of a battery box employed in the electric assist bicycle of the present invention, and is a perspective view of a main part in a state where the battery box is being attached to the electric assist bicycle and a perspective view of a main part of the lock mechanism. It is a principal part perspective view of the standing pipe vicinity of the electrically assisted bicycle before mounting | wearing with a battery box. FIG. 6 is a perspective view of a main part in the vicinity of a standing pipe of the battery-assisted bicycle with the battery box mounted and a cross-sectional view in the vicinity of a locking part in the lock mechanism. It is a description perspective view of the base part in which a latching | locking part is accommodated. It is a perspective view explaining the related operation | movement of the to-be-restricted part of the base part in which the latching | locking part in an unlocked (unlocked) state and a locked state is accommodated, and the control part in a key cylinder. It is each cross-sectional view explaining the behavior of the base part which accommodated the latching | locking part in a key cylinder casing. It is explanatory drawing of the electric bicycle of the 1st prior art example disclosed by patent document 1. FIG. It is explanatory drawing of the electrically assisted bicycle of the 2nd prior art example disclosed by patent document 2. FIG.

  Hereinafter, an electrically assisted bicycle according to the present invention will be described with reference to the drawings. Note that the front, rear, left, right, up, and down directions described below are based on a direction in which the traveling direction of the bicycle is the front. As shown in FIG. 1, the electrically assisted bicycle according to the present invention is an electrically assisted bicycle in which a battery box 1 is detachably mounted between a standing pipe 10 and a rear wheel 15, and the battery box 1 is locked to a vehicle body. The key insertion port 5A of the key for operating locking / unlocking (unlocking) in the locking mechanism 4 to be locked is arranged on the left side in the vehicle width direction of the upright pipe 10 and upward. .

  FIG. 1 is an explanatory view showing an attachment state of the lock mechanism of the first embodiment in the electrically assisted bicycle of the present invention, and FIGS. 2 to 7 illustrate the battery box lock mechanism employed in the electrically assisted bicycle of the present invention. To do. As shown in FIG. 1, in the electrically assisted bicycle according to the present invention, a battery box 1 is detachably mounted between a standing pipe 10 and a rear wheel 15, and the battery box 1 is locked by being locked to a vehicle body. A key insertion opening 5A for a key for operating locking / unlocking in the mechanism 4 is arranged on the left side in the vehicle width direction of the upright pipe 10 and upward. Thus, for most passengers who get on and off from the left side of the vehicle body because of left-hand traffic, the key insertion port 5A in the lock mechanism 4 can be easily seen without changing the sight line of the passenger before and after getting on. The key insertion port 5A that can be easily seen from the stand-off position of the passenger and can be quickly prepared from above along the standing pipe 10 from the upper side. Key can be inserted.

  Further, as shown in FIGS. 1B and 1C, the key insertion slot 5A is disposed in front of the rear end portion of the standing pipe 10 at the same height position (see also FIG. 4B). Accordingly, the key insertion port 5A of the lock mechanism 4 is located at least in front of the upper end of the rearwardly tilting vertical pipe 10 that is normally located at the substantially central portion in the front-rear direction of the saddle with the height of the saddle 9 being lowered most. Since it is arranged, the key insertion slot 5A can be seen from above without overlapping with the flat portion of the flat saddle 9 that gradually decreases forward, and there is no need to detour and insert the fingers below the saddle. The key can be smoothly inserted into the key insertion slot without any stress from above through the narrow part of the saddle. In FIG. 4B, as will be described later, the key insertion port 5A in the key cylinder (5) is located slightly ahead of the support shaft 22 of the base portion 7 in which the locking portion 3 in the lock mechanism 4 is accommodated (FIG. 2). See also FIG.

  Further, as shown in FIG. 3, the key cylinder 5 into which the key is inserted is disposed substantially along the standing pipe 10, and the key can be smoothly inserted into the key insertion opening 5A by the operation along the standing pipe 10. In addition, since the key cylinder 5 in the lock mechanism 4 does not protrude so much in the left-right direction of the vehicle body from the standing pipe 10, there is no possibility of interfering with the inside of the leg portion when the passenger is pedaling. Further, as will be described in detail later, the lock mechanism 4 is configured to hold the locking position of the locking portion 3 with respect to the battery box 1 in the key unlocked state, and to remove the battery box 1. Accordingly, the lock portion 3 can be unlocked according to the situation, and the key unlocking operation for removing the battery box 1 can be easily performed without changing the posture when getting off the vehicle. In many cases, the battery box 1 can be effectively prevented from being released before the battery box 1 is removed, so that the battery box 1 does not fall off due to illusion.

  Also, as shown in FIGS. 1B and 1C, the key 32 inserted into the insertion port 5A of the lock mechanism 4 and the key insertion of the rear circle lock 17 that prevents the rear wheel at the rear of the standing pipe 10 from rotating. The key 32 inserted into the opening 18A is shared, and the key insertion / removal direction in the lock mechanism 4 and the key insertion / removal direction in the rear circle lock 17 are oriented in a direction substantially along the vehicle body surface. The lock mechanism 4 and the rear circle lock 17 in the battery box 1 can be operated with one key 32, and the key insertion ports 5A and 18A are oriented in a direction substantially along the vehicle body surface. The key 32 can be inserted between the key insertion openings 5A and 18A arranged close to each other quickly and smoothly with minimum line-of-sight and hand movement within the same plane. That.

  FIG. 2A is a perspective view of a main part in a state where a battery box is being attached to the electrically assisted bicycle, and FIG. 2B is a perspective view of a main part of the lock mechanism in which a casing is omitted. FIG. 3 is a perspective view of the main part in the vicinity of the standing pipe of the electrically assisted bicycle before the battery box is mounted. Although not shown, a hub portion of the rear wheel 15 is pivotally supported at a joint portion between the lower end portion of the rear fork (seat stay) 16 of the vehicle body frame and the rear end portion of the chain stay 14. The hawk 16 is provided with a rear circle lock 17 that locks the rotation of the rear wheel 15 and includes a key cylinder 18. A pedal depression force detection mechanism and a pedal crank are provided at a joint portion between a lower end portion of a lower down tube that extends rearward and downward from a head pipe of the vehicle body frame and a lower end portion of a standing pipe (seat tube) 10 that supports a saddle 9 on the upper portion. The hanger part 11 to which the shaft or the like is assembled is joined by welding or the like.

  Between the rear part of the hanger part 11, that is, between the hanger part 11 and the front end part of the chain stay 14 that pivotally supports the rear wheel 15 at the rear end part, a bracket (not shown) is joined and arranged by welding or the like. A battery mounting portion 13 is fixed to the upper surface portion of the bracket. As shown in FIG. 2, the battery box 1 in which the battery is housed in the space between the rear part of the standing pipe 10 and the front part of the rear wheel 15 is an upper part of the battery mounting part 13. It is mounted in a standing position by a swinging motion centered on the. When the appropriate convex portion of the lower end portion of the battery box 1 is inserted into the groove 29 slightly left of the vehicle body on the upper surface of the battery mounting portion 13 in FIG. The power supply to the auxiliary power drive unit exposed to the unit and the connector terminals of the connection lines for various detection signals are connected in alignment with the connector terminals 30 arranged at corresponding positions on the upper surface of the battery mounting unit 13. become.

  A locked portion 2 is formed on the upper side surface of the battery box 1 mounted and mounted on the battery mounting portion 13 corresponding to the locking portion 3 such as a hook in the lock mechanism 4. As shown in FIG. 2B, the lock mechanism 4 includes a key cylinder 5 having a key insertion port 5A at its upper end, and a locking portion 3 such as a hook combined with the key cylinder 5 so that it can move linearly as shown by a hatched arrow. The base portion 7 is housed in the base portion 7 constituting the hook holder, and the base portion 7 is disposed so as to be swingable with respect to the support shaft 22 as indicated by a white arrow indicating the unlocking direction. As will be described in detail later, the base portion 7 is configured to be freely swingable by a restricting portion 6 based on a key operation of the key cylinder 5. The lock mechanism 4 is preferably installed at a corresponding position on the left side surface of the standing pipe 10 corresponding to the locked portion 2 of the battery box 1. This is because usually, in a bicycle that is a left-handed vehicle, a passenger stands on the left side of the vehicle body and operates the lock mechanism 4 or the like.

  FIG. 4A is a perspective view of the main part near the standing pipe of the battery-assisted bicycle with the battery box mounted, and FIG. 4B is a cross-sectional view of the vicinity of the locking part in the lock mechanism. In FIG. 4A, the casing of the key cylinder 5 is not shown. When the locked portion 2 in the battery box 1 presses the locking portion 3 that is a hook in the lock mechanism 4 as shown by the black arrows in FIGS. 2A and 2B, as shown in FIG. As the battery box 1 is mounted, the leading slope 31 of the locked portion 2 acts on the inclined surface 26 of the locking portion 3 of the locking mechanism 4 against the restoring force of the restoring spring 24 for linear movement. It is understood that after the locking portion 3 is retracted, the locked portion 2 of the battery box 1 is locked by the urging force of the locking portion 3 such as a hook in the lock mechanism 4 and the restoring spring 24.

  FIG. 5 is an explanatory perspective view of the base portion in which the locking portion is accommodated. As shown in FIG. 5 (A), the locking portion 3 composed of a hook or the like in the lock mechanism 4 is supported so as to be swingable around a support shaft 22 (see FIGS. 2, 6 and 7). It is accommodated in the hook accommodating part 19 in the base part 7 constituting the hook holder so as to be linearly movable as indicated by an arrow. The base portion 7 has a pair of arm portions 20, 20 extending substantially perpendicular to the moving direction of the locking portion 3 of the hook housing portion 19, and each support shaft hole 21 is drilled in the vicinity of these tips. Is done. As shown in FIG. 6, which will be described later, a support shaft 22 planted in the key cylinder casing 25 is inserted into each of the support shaft holes 21, and the base portion 7, that is, the locking portion 3 is inserted into the key cylinder casing 25. Is slidably arranged by the coil spring 23 so as to be restored. FIG. 5B is a view of the base portion 7 as viewed from below. FIG. 5C is a perspective view of a state in which the locking portion 3 is housed and assembled in the hook housing portion 19. In addition, on the upper surface of the hook housing part 19, a regulated part 8, which will be described later, is regulated to restrict the swinging movement of the base part 7.

  FIG. 6 is a perspective view for explaining the related operation between the restricted portion of the base portion in which the locking portion is accommodated in the unlocked (unlocked) state and the locked state and the restricting portion in the key cylinder. First, the locked state of the base part 7 in which the locking part 3 is accommodated will be described. Prior to that, the locking operation of the locking portion 3 with the mounting operation of the battery box 1 will be described with reference to FIGS. 7B and 7C. The locked portion 2 in the battery box 1 by the mounting operation of the battery box 1 will be described. The leading inclined surface 31 (FIG. 4B) contacts the inclined surface 26 of the locking portion 3, so that the locking portion 3 is brought into the restoring force of the restoring spring 24 in the hook housing portion 19 in the base portion 7. After pushing back against the state shown in FIG. 7B, the locking portion 3 returns to the same state as in FIG. 7C due to the restoring force of the restoring spring 24, and the locked portion in the battery box 1 is restored. 2 and the locking part 3 are engaged and locked.

  In the locked state of FIGS. 6 (C) and 6 (D), the restricting portion 6 below the key cylinder 5 is in the restricting position in the figure. At this time, as shown in FIG. 6C, the regulated portion 8 and the key cylinder in the base portion 7 that houses the locking portion 3 that is swingably combined with the key cylinder casing 25 by the support shaft 22. 5 is in a relationship of interference restriction. That is, the swinging operation of the base portion 7 is restricted by the restriction portion 6 below the key cylinder 5 being positioned on the swing locus of the restricted portion 8 formed on the upper surface of the hook housing portion 19. Next, when the key is inserted into the key cylinder 5 and rotated to perform the unlocking operation, the restricting portion 6 interlocked with the rotating operation of the key cylinder 5 (see FIG. 2B) is rotated and illustrated. 6 (B) is located at the non-restricted position. That is, the restricting portion 6 moves to the back of the drawing in FIG. 6C and retreats from the swinging locus of the restricted portion 8 in the base portion 7, so that the base portion 7 as shown in FIG. The locking portion 3 can swing in the unlocking direction (white arrow) against the restoring force of the restoring spring 23 constituted by a coil spring.

  FIG. 7 includes a cross-sectional view of the base portion 7 portion in which the locking portion 3 composed of a hook is accommodated, and is a view of the key cylinder side looking up from the cross-section, seeing the regulating portion 6 on the key cylinder side. Can do. 7B and 7C show the unlocked and locked state in a state where the swing of the base portion 7 is restricted and only the linear movement of the locking portion 3 is possible. By the unlocking operation of the key based on the key operation, the restricting portion 6 is retracted from the swing locus of the restricted portion 8 in the base portion 7. However, as it is, the base portion 7 does not start to swing due to the relatively large restoring force of the coil spring 23. Only when the battery box 1 is manually removed or unlocked, the locked portion 2 of the battery box 1 presses the surface of the locking mechanism 4 opposite to the inclined surface 26 of the locking portion 3 in the swinging direction. As a result, as shown in FIG. 7A, the locking portion 3, that is, the base portion 7 oscillates against the restoring force of the coil spring 23 around the support shaft 22. 7 is linearly retracted, and the locking portion 3 is detached from the locked portion 2 of the battery box 1, so that the battery box 1 can be removed for charging or the like. . Thus, the sliding direction by the linear movement in the base part 7 of the locking part 3 when the battery box 1 is mounted, and the sliding direction by the swinging of the locking part 3 and the base part 7 when the battery box 1 is removed. Therefore, each operation durability between the sliding portions is improved.

  Note that, as clearly shown in FIG. 7C, the inclined surface 26 of the locking portion 3 composed of a hook or the like preferably has an arc shape that coincides with the radius R centering on the support shaft 22. Configured. With this configuration, when the locking portion 3 swings in the key cylinder casing 25, an interference gap with the casing can be suppressed to a minimum, and the locking portion 3 can be removed from the key cylinder casing 25. Oscillation interference with the hook hole 28 for appearing and retracting can be minimized. That is, the opening area of the hook hole 28 can be minimized.

  The embodiment of the present invention has been described above, but within the scope of the present invention, the mounting form of the lock mechanism to the standing pipe, the shape and form of the rear circle lock and its mounting site and mounting form, the battery box The shape (in addition to the box shape as in the illustrated embodiment, it may be a frame shape), the type, and the shape of the locked portion (the front of the locking portion on the front side of the locked portion when the battery box is mounted) If the locking portion can be properly locked, it can be formed in an appropriate shape in an appropriate part of the battery box), a battery box mounting form (as in the embodiment, the lower end of the battery box) In addition to a swinging configuration with the center of the swinging portion, a horizontal lateral movement mode to the lock mechanism (for example, one-touch mounting on the bottom of the battery box by lateral movement to the battery box mounting portion It is also possible to install by a lateral movement to a locking mechanism having a locked portion and a locking portion at the upper part of the battery box, in which case the connector terminal for wiring provided on the battery box mounting portion is horizontal. In addition, if it is possible to avoid interference with the seat stay by design, a mounting form from above the battery box is also considered. In this case, the engagement with the locked portion is the vertical engagement instead of the rocking engagement of the embodiment, and even in this case, the vertical swing of the base portion that houses the locking portion is restricted. The key cylinder in which the restricting portion is formed is preferably configured to face substantially the vertical direction as in the illustrated embodiment, but in some cases, the key cylinder and base portion as in the embodiment may be combined. If this is adopted as it is, it does not prevent the key cylinder from being arranged substantially in the horizontal direction), the shape and form of the restricting portion in the key cylinder and the forming portion, the shape and form of the restricted portion in the base portion, and Forming part, storage form in the base part of the locking part and its restoration form by the restoring spring, swinging form during the unlocking operation of the base part (in the embodiment, the coil spring is removed by the detaching action which is the unlocking action of the battery box) For example, a spring, a ball, and a group of protrusions are provided between an appropriate portion of the outer periphery of the base portion and an appropriate portion of the corresponding inner periphery of the key cylinder casing. A moderation mechanism based on the combination of the two is provided so that the battery box can be removed safely with a sense of moderation. Support mode in the key cylinder casing of the base portion via the support shaft (for example, the moderation mechanism may be formed between the support shaft and the support shaft hole), and the lock mechanism of this battery box is applied The type of the electric assist bicycle to be used can be appropriately adopted. In addition, the specifications described in the examples are merely examples in all respects and should not be interpreted in a limited manner.

  The battery box locking mechanism of the present invention is preferably applied to a locking mechanism when a battery for supplying power to an auxiliary power drive unit such as an electric assist bicycle is mounted on a vehicle body, but is limited to an electric assist bicycle. The present invention can also be applied as a lock mechanism for mounting a battery box as a power source in a battery-equipped vehicle such as a motorcycle or a transport vehicle requiring auxiliary power.

1 Battery Box 4 Locking Mechanism 5 Key Cylinder 5A Key Insertion Port 9 Saddle 10 Standing Pipe (Seat Tube)
13 Battery mounting part 14 Chain stay 15 Rear wheel 16 Rear fork (seat stay)
17 Rear circle lock 18 Key cylinder 18A Key slot 32 Key

Claims (5)

In an electrically assisted bicycle having a battery box detachably mounted between a vertical pipe and a rear wheel, a key insertion port for a key for operating locking / unlocking in a lock mechanism that locks the battery box by locking to the vehicle body The electrically assisted bicycle is arranged on the left side of the vertical pipe in the vehicle width direction and upward. The electrically assisted bicycle according to claim 1, wherein the key insertion port is disposed in front of a rear end portion of the standing pipe. The electrically assisted bicycle according to claim 1 or 2, wherein the key cylinder into which the key is inserted is disposed substantially along the standing pipe. The lock mechanism is configured to hold the locking position of the locking portion with respect to the battery box in the key unlocked state, and the locking portion is unlocked in accordance with the removal operation of the battery box. The electrically assisted bicycle according to any one of claims 1 to 3. The key in the lock mechanism and the key in the rear circle lock that prevents the rear wheel of the rear portion of the standing pipe from rotating are made common, and the key removal insertion direction in the lock mechanism and the key removal insertion direction in the rear circle lock The power-assisted bicycle according to any one of claims 1 to 4, wherein the power-assisted bicycle is oriented in a direction substantially along the vehicle body surface.

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