An external reversing drive device for motorcycles

Abstract

This utility model relates to the technical field of motorcycle reversing devices, specifically an external reversing drive device for motorcycles. It includes a retaining block with a retaining groove on its inner side for engaging the rear wheel support arm; a chain drive assembly including a motor mounted on the outer side of the retaining block and an overrunning clutch positioned below the retaining block; the driving component of the overrunning clutch is sleeved on the motor shaft, and the driven component is connected to a sprocket, which engages with the vehicle chain for transmission. This reversing drive device is simple in structure, easy to install, and does not affect the normal function of the motorcycle. Reversing can be achieved simply by controlling the motor, providing the driver with a better driving experience.

Description

Technical Field

[0001] This utility model relates to the technical field of motorcycle reversing devices, and in particular to an external reversing drive device for motorcycles. Background Technology

[0002] Motorcycles are vehicles powered by gasoline engines and steered by the front wheel operated by handlebars. They are lightweight, agile, and fast, and are widely used for patrolling, passenger and freight transportation, as well as sports equipment. They are a convenient and fast means of transportation.

[0003] Existing heavy motorcycles do not have a reverse function, so the rider must manually operate them to reverse in order to complete a U-turn. This requires the rider to first dismount, then stand on one side of the motorcycle and push it backward. Because the motorcycle is heavy, a great deal of force is required for manual operation, and even a slight mistake can easily cause the motorcycle to tip over, resulting in personal injury.

[0004] Chinese invention patent CN112224332A discloses an external motorcycle reversing aid, comprising a housing, a power input shaft, a power output shaft, a spline shaft, a first driven internally staggered bevel gear, a second driven internally staggered bevel gear, an output bevel gear, a reversing fork, and a bidirectional clutch gear. The housing has a first circular hole at its upper end. The power input shaft is located within the first circular hole, with one end extending into the housing. The first bevel gear is located at the end of the power input shaft extending into the housing. The power output shaft is sleeved on the power input shaft and can rotate freely. One end of the power input shaft extends into the housing, and the second bevel gear is located at the end of the power input shaft extending into the housing. A second circular hole is located on the side of the housing, penetrating the housing. The spline shaft is located within the housing, with its central axis coinciding with the central axis of the second circular hole. A keyway is provided on the spline shaft. The output bevel gear is located at one end of the spline shaft, and the output bevel gear meshes with the second bevel gear. Although the text mentions that the gearbox does not need to be redesigned, according to its instruction manual, it requires connecting the rear countershaft of the engine and the end of the power input shaft outside the housing, meaning its power source is the motorcycle's engine. If the engine malfunctions, the device will not work, thus preventing it from assisting with reversing. Alternatively, because it acts as a transmission intermediary between the chain and the engine, requiring the chain to mesh with its sprockets, damage to it will render the motorcycle unable to move properly. Furthermore, installation on the motorcycle requires professional personnel.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this utility model is to overcome the problems of the prior art and provide an external reversing drive device for motorcycles to solve the technical problem that heavy motorcycles do not have a reversing function, while existing reversing devices rely on engine drive and have high installation requirements.

[0007] The above objectives are achieved through the following technical solutions: An external reversing drive device for a motorcycle includes...

[0008] The retaining block has a retaining groove on its inner side for engaging the rear wheel control arm. A chain drive assembly includes a motor disposed on the outer side of the clamping block and an overrunning clutch disposed below the clamping block; the driving component of the overrunning clutch is sleeved on the shaft of the motor, the driven component of the overrunning clutch is connected to a sprocket, and the sprocket engages with the vehicle chain for transmission.

[0009] Furthermore, the bottom surface of the clamping block is also provided with a curved arm, the top end of the curved arm is connected to the bottom surface of the clamping block, and the bottom end of the curved arm is provided with a roller assembly, which corresponds to the sprocket and can limit the bottom surface of the vehicle chain.

[0010] Furthermore, the crank arm is an arc-shaped support arm that partially surrounds the overrunning clutch, and the inner wall of the crank arm and the bottom surface of the holding block form an overrunning clutch holding cavity.

[0011] Furthermore, the bottom end of the crank arm is provided with an outwardly protruding boss, and the outer side of the boss is provided with a right-angle mounting position for the movable installation of the roller assembly.

[0012] Furthermore, the roller assembly includes a roller bracket that can be movably connected to the right-angle mounting position. The roller bracket has a first roller shaft and a second roller shaft symmetrically arranged on its left and right sides. The first roller shaft and the second roller shaft are respectively movably fitted with a first roller and a second roller.

[0013] Furthermore, a vertical waist-shaped groove is provided at the axial center of the roller bracket, and a locking screw hole is provided on the vertical side wall of the corresponding right-angle mounting position. The locking screw is screwed into the locking screw hole through the waist-shaped groove to fix the roller bracket to the crank arm.

[0014] Furthermore, an adjustment screw hole is provided on the horizontal bottom wall of the right-angle mounting position, and the adjustment screw abuts against the bottom edge of the roller bracket through the adjustment screw hole.

[0015] Furthermore, the motor is a worm gear motor.

[0016] Furthermore, the motor also includes a protective housing.

[0017] Furthermore, the overrunning clutch is a bidirectional overrunning clutch.

[0018] This utility model provides an external reversing drive device for motorcycles that does not rely on the motorcycle's engine for power. It only needs to connect to the rear wheel control arm and ensure that the sprocket and chain are internally engaged. This reversing drive device is not only simple in structure and easy to install, but also does not affect the normal function of the motorcycle. Reversing is achieved solely by controlling the motor, providing the driver with a better driving experience. Attached Figure Description

[0019] Figure 1 This is a first-view structural diagram of an external reversing drive device for a motorcycle according to the present invention. Figure 2 This is a second-view structural diagram of an external reversing drive device for motorcycles according to the present invention; Figure 3 This is an exploded view of an external reversing drive device for a motorcycle according to the present invention. Figure 4 This is a schematic diagram of the assembly of the chain drive assembly and the clamping block in an external reversing drive device for motorcycles according to the present invention. Figure 5 This is a schematic diagram illustrating the engagement and lifting of an external reversing drive device for a motorcycle with the vehicle chain, as described in this utility model. Figure 6 This is a schematic diagram of a protective housing in an external reversing drive device for motorcycles according to the present invention; Figure 7 This is a schematic diagram of an external reversing drive device for motorcycles, as described in this utility model, applied to a motorcycle.

[0020] Illustration markings: 1-Card holding block, 101-Card holding slot; 2-Chain drive assembly, 201-Motor, 202-Shaft, 203-Overrunning clutch, 204-Driven component, 205-Sprocket; 3-Crank arm, 301-Boss, 302-Right angle mounting position, 303-Locking screw hole, 304-Adjusting screw hole; 4-Roller assembly, 401-Roller bracket, 402-First roller shaft, 403-Second roller shaft, 404-First roller, 405-Second roller, 406-Oval groove; 5-Overrunning clutch holding chamber; 6-Vehicle chain; 7- Rear wheel control arm; 8-Rear wheel axle; 9-Drive gear; 10 - Protective housing; 11-Cover plate; 12 - Rear wheel; 13 - Rear wheel gear. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] like Figures 1-4 As shown, this solution provides an external reversing drive device for motorcycles, comprising: The retaining block 1 has a retaining groove 101 on its inner side for retaining the rear wheel support arm 7. The chain drive assembly 2 includes a motor 201 disposed on the outer side of the clamping block 1 and an overrunning clutch 203 disposed below the clamping block 1; the driving component of the overrunning clutch 203 is sleeved on the shaft 202 of the motor 201, and the driven component 204 of the overrunning clutch 203 is connected to the sprocket 205, which meshes with the vehicle chain 6 for transmission.

[0023] Specifically, in this embodiment, the rear wheel support arm 7 is a support component used by the motorcycle to support the rear wheel axle 8, and is typically arranged laterally. The vehicle chain is the rear wheel drive component of the motorcycle, with one end connected to the engine drive gear 9 and the other end connected to the rear wheel gear 13 of the rear wheel hub.

[0024] like Figure 7 As shown, when the motorcycle is in normal operation, the motorcycle engine drives the drive gear 9 to rotate counterclockwise, which in turn drives the rear wheel gear 13 via the vehicle chain 6 to rotate the rear wheel 12 counterclockwise, thus propelling the vehicle forward. At this time, the driven part 204 of the overrunning clutch 203 is separated from the driving part, and the vehicle chain 6 only drives the driven part 204 to rotate counterclockwise, while the driving part and the motor 201 do not work.

[0025] When the motorcycle needs to reverse, the motor 201 is powered on, and the shaft 202 drives the driving component to rotate clockwise. At this time, the driving component and the driven component 204 of the overrunning clutch 203 are engaged, and the driven component 204 also rotates clockwise synchronously, thereby driving the sprocket 205 to drive the vehicle chain 6 meshing with it to rotate clockwise, so as to achieve the purpose of driving the motorcycle to reverse.

[0026] During the aforementioned control process, the driven member 204 of the overrunning clutch disengages from the driving member when rotating clockwise and engages with the driving member when rotating counterclockwise. The principle governing the engagement and disengagement between the driving member and the driven member 204 is common knowledge in the field of overrunning clutches and will not be elaborated upon here.

[0027] In this embodiment, the motor 201 is powered by connecting to the motorcycle battery, and the motor can be switched on and off via buttons. For ease of operation, the buttons can be located on the handlebars. Button control for power on / off is conventional technology in this field and will not be described further.

[0028] like Figure 3 As shown, in addition to further increasing the firmness of the retaining block 1 and the rear wheel support arm 7, in this embodiment, a cover plate 11 is also provided to limit the rear wheel support arm 7 after the retaining block 1 and the rear wheel support arm 7 are engaged. The cover plate 11 matches the retaining block 1, and the two are connected by screws. This assembly method is simple and easy.

[0029] In this embodiment, the bottom surface of the clamping block 1 is also provided with a crank arm 3. The top end of the crank arm 3 is connected to the bottom surface of the clamping block 1. The bottom end of the crank arm 3 is provided with a roller assembly 4. The roller assembly 4 corresponds to the sprocket 205 and can limit the bottom surface of the vehicle chain 6.

[0030] Specifically, after the external reversing drive unit is installed with the motorcycle's rear wheel control arm 7, its initial state is as follows: The sprocket 205 is located above the vehicle chain 6 and can engage with the vehicle chain 6; while the support roller assembly 4 is located below the vehicle chain 6, which realizes the limiting and lifting of the vehicle chain 6, and can ensure that the vehicle chain 6 is always engaged with the sprocket 205, avoiding the problem of the vehicle chain 6 disengaging from the sprocket 205 due to loosening.

[0031] The roller assembly 4 improves the stability between the device and the vehicle chain 6.

[0032] like Figure 3 and Figure 4 As shown, the crank arm 3 is an arc-shaped support arm that partially surrounds the overrunning clutch 203. The inner wall of the crank arm 3 and the bottom surface of the clamping block 1 form an overrunning clutch clamping cavity 5. This not only precisely confines the overrunning clutch 203 within the overrunning clutch clamping cavity 5, but also provides support and lifting for the bottom of the overrunning clutch 203, ensuring its operational stability.

[0033] The bottom end of the crank arm 3 is provided with an outwardly protruding boss 301, and the outer side of the boss 301 is provided with a right-angle mounting position 302 for the movable installation of the support roller assembly 4.

[0034] like Figure 1 and Figure 4 As shown, the roller assembly 4 includes a roller bracket 401 that can be movably connected to the right-angle mounting position 302. The roller bracket 401 has a first roller shaft 402 and a second roller shaft 403 symmetrically arranged on its left and right sides. A first roller 404 and a second roller 405 are respectively movably sleeved on the first roller shaft 402 and the second roller shaft 403.

[0035] In this embodiment, the first support roller 404, the second support roller 405, and the sprocket 205 form an isosceles triangle with the sprocket 205 as the vertex. The sprocket 205 can engage with the upper part of the vehicle chain 6 in this segment, while the first support roller 404 and the second support roller 405 can lift the vehicle chain 6 on both sides of the engagement point, so that the sprocket 205 can better act on the vehicle chain 6.

[0036] like Figure 5 As shown, a vertical waist-shaped groove 406 is provided at the axial center of the roller bracket 401, and a locking screw hole 303 is provided on the vertical side wall of the corresponding right-angle mounting position 302. The locking screw is screwed into the locking screw hole 303 through the waist-shaped groove 406 to fix the roller bracket 401 to the crank arm 3.

[0037] In this embodiment, the purpose of using a waist-shaped groove on the roller bracket 401 is to facilitate the adjustment of the distance between the roller assembly 4 and the sprocket 205, thereby making it suitable for more motorcycle sizes. Furthermore, it also allows for free adjustment of the tension between the device and the vehicle chain 6.

[0038] like Figure 4 As shown, an adjustment screw hole 304 is provided on the horizontal bottom wall of the right-angle mounting position 302. The adjustment screw abuts against the bottom edge of the roller bracket 401 through the adjustment screw hole 304. This structure provides stable support after further height adjustment of the roller bracket 401, and can prevent the roller bracket 401 from falling due to loosening of the locking screw at the waist groove 406 caused by long-term operation.

[0039] In this embodiment, the motor 201 is a worm gear motor. Specifically, the worm gear motor consists of a motor part and a worm gear reduction mechanism. It is a power device that integrates the worm gear reduction mechanism with the motor. With its unique transmission structure, it is widely used in low-speed, high-torque, and precision control scenarios.

[0040] Its working principle is as follows: When the worm rotates, it meshes with the worm wheel through the helical teeth, converting the high-speed, low-torque motor power into low-speed, high-torque output. Since the helix angle of the worm is usually smaller than the friction angle, the transmission has a self-locking property, that is, the worm wheel cannot reverse the worm, similar to a screw that cannot reverse itself after being screwed into a nut. This embodiment uses the self-locking property of its transmission to control the overrunning clutch.

[0041] like Figure 6 As shown, as an optimization of this embodiment, the motor 201 further includes a protective housing 10.

[0042] Since this device is installed on the outside of the rear wheel support arm of the motorcycle, in order to ensure the stable operation of the motor is not affected by external interference, a protective housing 10 is provided on its outside in this embodiment.

[0043] In this embodiment, the overrunning clutch 203 is a two-way overrunning clutch, such as a wedge-type two-way overrunning clutch or a two-way overrunning clutch with a shift fork, wherein: A wedge-type bidirectional overrunning clutch consists of two independent clutch plates connected by a wedge mechanism. One clutch plate is fixed, while the other is movable, and the two are locked or disengaged by the wedge. When power needs to be transmitted in one direction, the wedge presses the two clutch plates together, forming a rigid connection to achieve power transmission; when it is necessary to switch directions, the wedge releases, the clutch plates disengage, and power transmission is interrupted, thus achieving instantaneous power conversion.

[0044] A bidirectional overrunning clutch with a shift fork typically consists of an outer ring, a star wheel, rollers, and a pawl. When the outer ring is the driving element, it can transmit motion and torque in both directions. When the pawl is the driving element, regardless of the direction of rotation, as long as the pawl's rotational speed exceeds that of the outer ring or the star wheel, the clutch disengages, and the pawl performs an overrunning motion. In its natural state, the outer ring can rotate freely clockwise and counterclockwise. When the shift fork is engaged, moving the fork forward causes the outer ring to rotate clockwise, and moving it backward causes the outer ring to rotate in the opposite direction.

[0045] Since the structure and working principle of the bidirectional overrunning clutch described above are common knowledge in the field of overrunning clutches, they will not be elaborated here.

[0046] This embodiment employs a combination design of a worm gear motor, a two-way overrunning clutch, and a sprocket. This allows the worm gear motor to directly drive the sprocket to rotate clockwise and counterclockwise, enabling forward and reverse movement. Furthermore, even when the worm gear motor is not operating, the vehicle can still move forward or be pushed backward by itself.

[0047] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An external reverse drive for a motorcycle, characterized in that, include: The retaining block (1) has a retaining groove (101) on its inner side for retaining the rear wheel support arm (7). The chain drive assembly (2) includes a motor (201) disposed on the outer side of the clamping block (1) and an overrunning clutch (203) disposed below the clamping block (1); the driving component of the overrunning clutch (203) is sleeved on the shaft (202) of the motor (201), and the driven component (204) of the overrunning clutch (203) is connected to the sprocket (205), and the sprocket (205) engages with the vehicle chain (6) for transmission.

2. A reverse drive unit for a motorcycle as claimed in claim 1, wherein, The bottom surface of the clamping block (1) is also provided with a crank arm (3), the top end of the crank arm (3) is connected to the bottom surface of the clamping block (1), and the bottom end of the crank arm (3) is provided with a roller assembly (4). The roller assembly (4) corresponds to the sprocket (205) and can limit the bottom surface of the vehicle chain (6).

3. A reverse drive unit for a motorcycle as claimed in claim 2, wherein, The crank arm (3) is an arc-shaped support arm that partially surrounds the overrunning clutch (203), and the inner wall of the crank arm (3) and the bottom surface of the holding block (1) form an overrunning clutch holding cavity (5).

4. A reverse drive device for a motorcycle according to claim 2 or 3, characterized in that, The bottom end of the crank arm (3) is provided with an outward protruding boss (301), and the outer side of the boss (301) is provided with a right-angle mounting position (302) for the movable installation of the roller assembly (4).

5. A reverse drive assembly for a motorcycle as defined in claim 4 wherein, The roller assembly (4) includes a roller bracket (401) that can be movably connected to the right-angle mounting position (302). The roller bracket (401) is symmetrically provided with a first roller shaft (402) and a second roller shaft (403) on its left and right sides. A first roller (404) and a second roller (405) are respectively movably sleeved on the first roller shaft (402) and the second roller shaft (403).

6. A reverse drive assembly for a motorcycle as defined in claim 5 wherein, The roller bracket (401) has a vertical waist-shaped groove (406) at its axial center position. The corresponding right-angle mounting position (302) has a locking screw hole (303) on its vertical side wall. The locking screw is screwed into the waist-shaped groove (406) and the locking screw hole (303) to fix the roller bracket (401) onto the crank arm (3).

7. A reverse drive unit for a motorcycle as claimed in claim 6, wherein An adjustment screw hole (304) is provided on the horizontal bottom wall of the right-angle mounting position (302), and the adjustment screw abuts against the bottom edge of the roller bracket (401) through the adjustment screw hole (304).

8. A reverse drive assembly for a motorcycle as defined in claim 7, wherein The motor (201) is a worm gear motor.

9. A reverse drive unit for a motorcycle as defined in claim 1, wherein The motor (201) also includes a protective housing (10).

10. A reverse drive unit for a motorcycle as defined in claim 1, wherein The overrunning clutch (203) is a two-way overrunning clutch.

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