Chain wheel one-way ratchet wheel structure and carrying tool
By designing the unidirectional ratchet structure of the tooth plate, the central shaft structure is simplified, the processing cost and maintenance difficulty are reduced, and the convenient disassembly and maintenance of the mid-motor is realized, which solves the problems of complex structure and difficult maintenance of the middle-motor chassis.
Patent Information
- Application Number
- CN202422650277.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-31
AI Technical Summary
The existing mid-mounted motor has high structure cost, complex structure, and difficult installation and maintenance, especially inconvenient maintenance and replacement in case of failure of the mid-mounted motor.
A unidirectional ratchet structure of the unidirectional ratchet is designed, including a unidirectional ratchet, a unidirectional ratchet and a sleeve. Through the fixed connection between the unidirectional ratchet and the connection between the unidirectional ratchet and the sleeve, a unidirectional disk assembly is formed. The central shaft is connected to the inner hole of the sleeve to ensure that the rotation direction of the central shaft is consistent with the preset rotation direction of the unidirectional ratchet, and the constant operation of the transmission chain is achieved.
The central shaft structure is simplified, processing costs are reduced, assembly and maintenance are simplified, and the installation is provided outside the central motor for easy disassembly and repair, and the replacement is convenient, reducing the design difficulty of the central motor.
Smart Images
Figure CN223187619U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a one-way ratchet wheel structure of a toothed disc and a carrier, belonging to the technical field of mechanical transmission. Background Art
[0002] The crankset connection is a crucial component of a bicycle's transmission system, and its design directly impacts riding performance and comfort. The crankset connection, which includes the bottom bracket, crankarm, and crankset, is typically differentiated by its technology, build quality, weight, strength, and rigidity.
[0003] There are two types of cranksets: one-piece crankset and two-piece crankset. These two structures are the two main designs of bicycle crankset systems at present, and they differ in structure, performance and installation method.
[0004] An integrated chainring combines the chainring and crank into one integral component. There is no separate interface between the chainring and the crank. The integral component is installed on a specific central axis, and the one-way clutch structure is also set on the central axis.
[0005] A split chainring consists of a separate chainring and crank, which are bolted together or riveted together. A clutch mechanism is set between the crank and the chainring, allowing the chainring to rotate freely without driving the rear wheel when the rider is not pedaling.
[0006] The existing mid-mounted motor crankset has some drawbacks, mainly including the following aspects:
[0007] First, although the integrated crankset is lighter and more rigid, it has a higher manufacturing cost, which results in a higher price for electric-assisted bicycles equipped with an integrated crankset mid-mounted motor.
[0008] Second, the one-way clutch design of current integrated and split cranksets is relatively complex, which increases the difficulty of designing the crank and crankset of the mid-mounted motor. As a result, the installation and maintenance of the mid-mounted motor is more complicated than that of the front or rear motors, requiring more expertise and tools.
[0009] Third, since the mid-mounted motor is installed in the middle of the power-assisted bicycle and has a high degree of integration, once the chainring of the mid-mounted motor fails, it is difficult to repair and replace, and the cost is high.
[0010] In order to overcome some of the problems and disadvantages mentioned above, the existing one-way ratchet structure of the chainring was analyzed and improved, and a new one-way ratchet structure of the chainring was developed and designed, aiming to solve some practical problems such as high cost, complex structure, inconvenient installation, maintenance and replacement. Summary of the Invention
[0011] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a one-way ratchet structure of a crankset and a carrier, which can make the rotation direction of the central shaft and the crankset consistent, ensuring the constant running direction of the transmission chain. To achieve the above purpose, this utility model adopts the following technical solutions:
[0012] In a first aspect, the utility model provides a crankset one-way ratchet structure, comprising: a crankset, a one-way ratchet, a sleeve, and a central shaft; the crankset is engaged with a transmission chain; the outer shell of the one-way ratchet is fixedly connected to the inner hole of the crankset, and the inner hole of the one-way ratchet is connected to the outer circle of the sleeve; the crankset, the one-way ratchet, and the sleeve are assembled to form a one-way crankset assembly; the central shaft is connected to the inner hole of the sleeve;
[0013] When the rotation direction of the middle shaft is the same as the preset rotation direction of the one-way ratchet, the middle shaft drives the transmission chain through the one-way chainring assembly, and the middle shaft outputs driving force; when the rotation direction of the middle shaft is different from the preset rotation direction of the one-way ratchet, the middle shaft idles.
[0014] In combination with the first aspect, optionally, a boss is provided in the middle of the outer shell of the one-way ratchet, and the inner hole of the chainring is fixedly connected to the boss by screws and nuts.
[0015] In combination with the first aspect, optionally, the distance between the left and right end surfaces of the outer shell of the one-way ratchet is greater than the distance between the left and right end surfaces of the chainring, and the chainring inner hole of the chainring is fixedly connected to the left end surface or the right end surface of the boss so that the chainring and the transmission chain are on the same plane.
[0016] In combination with the first aspect, optionally, the outer circle of the sleeve includes a top boss, the top boss is provided with an external thread, the ratchet inner hole of the one-way ratchet is an internal threaded hole, and the thread of the internal threaded hole matches the external thread for connecting the ratchet inner hole of the one-way ratchet and the outer circle of the sleeve.
[0017] In combination with the first aspect, optionally, the outer circle of the sleeve also includes a bottom step. When the ratchet inner hole of the one-way ratchet is connected to the outer circle of the sleeve, the bottom end face of the bottom step is tightly attached to the end face of the shoulder of the central axis, which is used to axially limit the one-way chainring assembly.
[0018] In combination with the first aspect, optionally, a first keyway is provided on the central shaft, a second keyway is provided in the inner hole of the sleeve, and the central shaft and the inner hole of the sleeve are connected by a key connecting the first keyway and the second keyway.
[0019] In combination with the first aspect, optionally, the sleeve and the ratchet inner hole of the one-way ratchet are integrated into a whole to form a one-way ratchet with a sleeve; a first keyway is provided on the central shaft, and a second keyway is provided in the inner hole of the one-way ratchet with a sleeve, and the central shaft and the one-way ratchet with a sleeve are connected by a key connecting the first keyway and the second keyway.
[0020] In combination with the first aspect, optionally, both ends of the central shaft are provided with a square prism-shaped body with an inclination angle, and the square prism-shaped body with an inclination angle is used to install a crank that drives the central shaft to rotate.
[0021] In the second aspect, the utility model provides a vehicle comprising a sprocket and the one-way ratchet structure of the chainring described in the first aspect, wherein the sprocket is engaged with a transmission chain. When the central axis of the one-way ratchet structure of the chainring outputs driving force, the chainring of the one-way ratchet structure of the chainring drives the sprocket to operate through the transmission chain.
[0022] In combination with the second aspect, optionally, the central axis of the one-way ratchet structure of the crankset is mounted on the vehicle via a bearing group.
[0023] Compared with the prior art, the beneficial effects achieved by the one-way ratchet structure of a crankset and a carrier provided by the embodiment of the present invention include:
[0024] The utility model provides a one-way ratchet structure of a toothed disc, comprising: a toothed disc, a one-way ratchet, a sleeve and a central shaft; the toothed disc is meshed with a transmission chain; the outer shell of the one-way ratchet is fixedly connected to the inner hole of the toothed disc, and the inner hole of the one-way ratchet is connected to the outer circle of the sleeve; the toothed disc, the one-way ratchet and the sleeve are assembled to form a one-way toothed disc assembly; the central shaft is connected to the inner hole of the sleeve; the toothed disc, the one-way ratchet and the sleeve are assembled to form a one-way toothed disc assembly. The chainring and one-way ratchet are integrated into one unit, which can simplify the structure of the bottom bracket, reduce processing and manufacturing costs, make the chainring and one-way ratchet structure more concise, and make assembly and maintenance more labor-saving. When the chainring and one-way ratchet structure is used on a mid-mounted motor, the chainring, one-way ratchet, and sleeve are arranged outside the mid-mounted motor, which reduces the design difficulty of the crank and chainring of the mid-mounted motor. The parts are arranged outside the mid-mounted motor for easy disassembly, and in the event of a fault, it is convenient to repair and replace without disassembling the entire mid-mounted motor.
[0025] When the rotation direction of the middle shaft is the same as the preset rotation direction of the one-way ratchet, the middle shaft drives the transmission chain to operate through the one-way chainring assembly, and the middle shaft outputs driving force; when the rotation direction of the middle shaft is different from the preset rotation direction of the one-way ratchet, the middle shaft idles; when the one-way ratchet structure of the chainring is used, the rotation direction of the middle shaft is the same as the operation direction of the transmission chain, and when the crank does not provide driving force or the driving force provided is opposite to the rotation direction of the middle shaft, the transmission chain does not operate; the utility model can make the rotation direction of the middle shaft consistent with that of the chainring, thereby ensuring that the operation direction of the transmission chain is constant. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 A schematic diagram of the three-dimensional structure of a one-way ratchet structure of a crankset provided in Example 1 of the present utility model;
[0027] Figure 2 A schematic diagram showing a one-way ratchet structure of a crankset provided in Example 1 of the present invention, wherein the inner hole of the ratchet wheel and the outer circle of the sleeve are connected by threads;
[0028] Figure 3 This is a schematic structural diagram of a one-way ratchet structure of a crankset provided in Example 1 of the present invention, in which a sleeve and an inner hole of the ratchet of the one-way ratchet are integrated into one body.
[0029] In the picture:
[0030] 1. Middle shaft; 2. First bearing; 3. Key; 4. Second bearing; 5. Sleeve; 6. Screw; 7. Chainring; 8. Nut; 9. One-way ratchet. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0032] In the description of this utility model, it should be noted that the terms "upper / lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "set / mounted," "sleeved," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1
[0034] In this embodiment, the following is provided: Figure 1 The one-way ratchet structure of a crankset shown includes a central shaft 1 , a sleeve 5 , a crankset 7 and a one-way ratchet 9 .
[0035] The outer shell of the one-way ratchet is fixedly connected to the inner hole of the tooth plate of the tooth plate. The inner hole of the one-way ratchet is connected to the outer circle of the sleeve. The tooth plate, the one-way ratchet and the sleeve are assembled to form a one-way tooth plate assembly.
[0036] The middle shaft is connected to the inner hole of the sleeve, and the driving force is output through the sleeve. The toothed disc is engaged with the transmission chain, and the driving force of the toothed disc is output through the transmission chain.
[0037] When the rotation direction of the middle shaft is the same as the preset rotation direction of the one-way ratchet, the middle shaft drives the transmission chain to operate through the one-way chainring assembly, and the middle shaft outputs driving force.
[0038] When the rotation direction of the middle shaft is different from the preset rotation direction of the one-way ratchet, the middle shaft rotates idly and does not drive the transmission chain to operate.
[0039] like Figure 1 、 Figure 2 and Figure 3 As shown, a boss is provided in the middle of the outer shell of the one-way ratchet, and the inner hole of the tooth plate of the tooth plate is fixedly connected to the boss by screws 6 and nuts 8, thereby achieving the fixed connection between the outer shell of the one-way ratchet and the inner hole of the tooth plate of the tooth plate.
[0040] In this embodiment, the screws are hexagon socket screws.
[0041] like Figure 2 and Figure 3 As shown, the distance between the left and right end surfaces of the outer shell of the one-way ratchet is greater than the distance between the left and right end surfaces of the tooth plate. The tooth plate inner hole of the tooth plate is fixedly connected to the left end surface or the right end surface of the boss so that the plate and the transmission chain are on the same plane.
[0042] exist Figure 2 and Figure 3 In the embodiment shown, the inner hole of the crankset is fixedly connected to the left end surface of the boss.
[0043] exist Figure 2 In the illustrated embodiment, the outer circumference of the sleeve includes a top boss and a bottom step. The outer surface of the top boss is externally threaded, and the ratchet inner hole of the one-way ratchet is internally threaded. The threads of the internally threaded hole match the external threads, connecting the ratchet inner hole of the one-way ratchet to the outer circumference of the sleeve. When the ratchet inner hole of the one-way ratchet is connected to the outer circumference of the sleeve, the bottom end surface of the bottom step abuts against the end surface of the third shoulder of the central axle, thereby axially limiting the one-way crankset assembly.
[0044] exist Figure 2 In the embodiment shown, a first keyway is provided on the central shaft, and a second keyway is provided in the inner hole of the sleeve. The first keyway and the second keyway are connected by a key 3 to realize the connection between the central shaft and the inner hole of the sleeve. Figure 3 In the illustrated embodiment, the sleeve and the ratchet inner hole of the one-way ratchet are integrally formed, forming a sleeved one-way ratchet. When the sleeved one-way ratchet is mounted on the central axle, the left end face of the sleeved one-way ratchet abuts against the end face of the third shoulder of the central axle, thereby axially limiting the one-way crankset assembly.
[0045] exist Figure 3 In the embodiment shown, a first keyway is provided on the central shaft, and a second keyway is provided in the inner hole of the one-way ratchet with a sleeve. The first keyway and the second keyway are connected by a key 3 to realize the connection between the central shaft and the one-way ratchet with a sleeve.
[0046] exist Figure 2 The embodiment shown and Figure 3 In the embodiment shown, the key is a flat key, and other keys such as splines can be used to connect the first keyway and the second keyway. There is one set of first keyway and second keyway, and multiple sets of first keyway and second keyway can be provided according to the use conditions.
[0047] This embodiment assembles the chainring, one-way ratchet and sleeve to form a one-way chainring assembly, combining the chainring and the one-way ratchet into a whole, which can simplify the structure of the middle shaft, reduce processing and manufacturing costs, make the chainring and one-way ratchet structure simpler, and make assembly and maintenance more labor-saving.
[0048] When the one-way ratchet structure of the chainring is used on a mid-mounted motor, the chainring, one-way ratchet, and sleeve are arranged on the outside of the mid-mounted motor, which reduces the difficulty of designing the crank and chainring of the mid-mounted motor; being arranged on the outside of the mid-mounted motor, it is easy to disassemble, and convenient to repair and replace in case of failure, without having to disassemble the entire mid-mounted motor.
[0049] like Figure 1 As shown, a square prism with an inclination angle is provided at both ends of the central axis, and the square prism with an inclination angle is used to install a crank that drives the central axis to rotate. The crank is connected to the pedal device, and the pedal device is connected to the crank to drive the central axis to rotate.
[0050] When the rotation direction of the middle shaft is the same as the preset rotation direction of the one-way ratchet, the middle shaft drives the transmission chain to operate through the one-way chainring assembly, and the middle shaft outputs driving force. This embodiment can ensure that the rotation direction of the middle shaft is the same as the operating direction of the transmission chain.
[0051] When the bottom bracket rotates in a direction different from the one-way ratchet's intended direction of rotation, the bottom bracket spins. The drive chain does not rotate when the cranks are not providing drive (the rider is not pedaling) or when the drive is in the opposite direction of the bottom bracket's rotation (the rider is pedaling in the opposite direction of the pedals).
[0052] like Figure 1 and Figure 2 As shown, a bearing group is connected to the middle shaft, and the bearing group is used to install the middle shaft of the one-way ratchet structure of the chainring on the operating tool.
[0053] In this embodiment, the bearing group includes a first bearing 2 and a second bearing 4, which are respectively mounted on the outer circles of the journals corresponding to the central shaft.
[0054] The middle shaft is provided with a first shoulder and a second shoulder, such as Figure 2 and Figure 3 As shown, the right end face of the inner ring of the first bearing is close to the left end face of the first shoulder, and the left end face of the inner ring of the second bearing is close to the right end face of the second shoulder, which is used to limit the middle shaft and prevent the middle shaft from moving due to the influence of the cranks on both sides.
[0055] This embodiment provides Figure 2 The assembly method of the one-way ratchet structure of a toothed disc shown in the figure has the following specific steps:
[0056] Step 1: Install the first bearing and the second bearing onto the corresponding journal outer circles on the central shaft respectively, so that the right end face of the inner ring of the first bearing is close to the left end face of the first shoulder, and the left end face of the inner ring of the second bearing is close to the right end face of the second shoulder.
[0057] Step 2: Install the inner hole of the chainring on the left end face / right end face of the middle part of the outer shell of the one-way ratchet, and connect and lock it with screws and nuts.
[0058] Step 3: Screw the sleeve into the internal threaded hole of the one-way ratchet so that the top end face of the top boss of the sleeve is in close contact with the end face of the ratchet inner hole of the one-way ratchet. At this point, the chainring, one-way ratchet and sleeve are assembled to form a one-way chainring assembly.
[0059] Step 4: Place the key into the first keyway on the center shaft.
[0060] Step 5: After the second keyway is aligned with the key, install the one-way chainring assembly onto the outer circle of the right side journal of the middle shaft and fit it tightly against the right end face of the third shoulder.
[0061] Step 6: Assembly Completed.
[0062] This embodiment can make the rotation directions of the middle shaft and the chainring consistent, ensuring that the running direction of the transmission chain is constant. Example 2
[0063] This embodiment provides a vehicle, including a sprocket and a one-way ratchet structure of a crankset provided in Example 1.
[0064] The sprocket is engaged with the transmission chain. When the middle shaft of the one-way ratchet structure of the toothed disc outputs driving force, the toothed disc of the one-way ratchet structure drives the sprocket to operate through the transmission chain.
[0065] The middle shaft of the one-way ratchet structure of the toothed disc is installed on the vehicle through a bearing group.
[0066] In this embodiment, if Figure 1 As shown, the bearing group includes a first bearing 2 and a second bearing 4, which are respectively installed on the outer circle of the shaft neck corresponding to the central shaft. The right end face of the inner ring of the first bearing is close to the left end face of the first shaft shoulder, and the left end face of the inner ring of the second bearing is close to the right end face of the second shaft shoulder, which is used to limit the central shaft and prevent the central shaft from moving due to the influence of the cranks on both sides.
[0067] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0068] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0069] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A one-way ratchet structure of a toothed disc, characterized in that: include: A chainring, a one-way ratchet, a sleeve, and a central shaft; the chainring is engaged with a transmission chain; the outer shell of the one-way ratchet is fixedly connected to the inner hole of the chainring, and the inner hole of the one-way ratchet is connected to the outer circle of the sleeve; the chainring, the one-way ratchet, and the sleeve are assembled to form a one-way chainring assembly; the central shaft is connected to the inner hole of the sleeve; When the rotation direction of the middle shaft is the same as the preset rotation direction of the one-way ratchet, the middle shaft drives the transmission chain through the one-way chainring assembly, and the middle shaft outputs driving force; when the rotation direction of the middle shaft is different from the preset rotation direction of the one-way ratchet, the middle shaft idles.
2. The one-way ratchet structure of the crankset according to claim 1, characterized in that: A boss is provided in the middle of the outer shell of the one-way ratchet, and the inner hole of the toothed disc of the toothed disc is fixedly connected to the boss through screws and nuts.
3. The one-way ratchet structure of the crankset according to claim 2, characterized in that: The distance between the left and right end surfaces of the outer shell of the one-way ratchet is greater than the distance between the left and right end surfaces of the chainring, and the chainring inner hole of the chainring is fixedly connected to the left end surface or the right end surface of the boss so that the chainring and the transmission chain are on the same plane.
4. The one-way ratchet structure of the crankset according to claim 1, characterized in that: The outer circle of the sleeve includes a top boss, and the top boss is provided with an external thread. The ratchet inner hole of the one-way ratchet is an internal threaded hole. The thread of the internal threaded hole matches the external thread and is used to connect the ratchet inner hole of the one-way ratchet and the outer circle of the sleeve.
5. The one-way ratchet structure of the crankset according to claim 4, characterized in that: The outer circle of the sleeve also includes a bottom step. When the ratchet inner hole of the one-way ratchet is connected to the outer circle of the sleeve, the bottom end face of the bottom step is tightly attached to the end face of the shoulder of the central shaft, which is used to axially limit the one-way chainring assembly.
6. The one-way ratchet structure of the crankset according to claim 4, characterized in that: The central shaft is provided with a first keyway, the sleeve inner hole of the sleeve is provided with a second keyway, and the central shaft and the sleeve inner hole of the sleeve are connected by a key connecting the first keyway and the second keyway.
7. The one-way ratchet structure of the crankset according to claim 1, characterized in that: The sleeve and the ratchet inner hole of the one-way ratchet are an integral whole, forming a one-way ratchet with a sleeve; a first keyway is provided on the central shaft, and a second keyway is provided in the inner hole of the one-way ratchet with a sleeve, and the central shaft and the one-way ratchet with a sleeve are connected by a key connecting the first keyway and the second keyway.
8. The one-way ratchet structure of the crankset according to claim 1, characterized in that: Two ends of the central shaft are provided with square prism bodies with an inclination angle, and the square prism bodies with an inclination angle are used to install cranks that drive the central shaft to rotate.
9. A vehicle, characterized in that: It comprises a sprocket and a one-way ratchet structure of a toothed disc as described in any one of claims 1 to 8, wherein the sprocket is engaged with a transmission chain, and when the central axis of the one-way ratchet structure of the toothed disc outputs a driving force, the toothed disc of the one-way ratchet structure drives the sprocket to operate through the transmission chain.
10. The vehicle according to claim 9, characterized in that The central shaft of the one-way ratchet structure of the crankset is installed on the vehicle through a bearing group.