CN212423372U - Clutch type chain wheel driving device - Google Patents
Clutch type chain wheel driving device Download PDFInfo
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- CN212423372U CN212423372U CN202021535243.2U CN202021535243U CN212423372U CN 212423372 U CN212423372 U CN 212423372U CN 202021535243 U CN202021535243 U CN 202021535243U CN 212423372 U CN212423372 U CN 212423372U
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- 210000001611 motor endplate Anatomy 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000004080 punching Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a clutch type chain wheel driving device, which comprises a wheel shaft, a side end disc, a chain wheel sleeve, an inner sleeve, an elastic washer and a shifting knob; the side end disc is provided with teeth, the inner sleeve is fixedly arranged on a wheel shaft, the elastic gasket is fixedly arranged on the inner end face of the inner sleeve, the shifting knob is movably sleeved on the wheel shaft and is arranged on the inner side of the elastic gasket, the chain wheel sleeve is arranged on the inner sleeve through a bearing, one end of the outer side of the chain wheel sleeve is provided with a chain wheel, one end of the inner side of the chain wheel sleeve is provided with a circle of cylinder, a guide channel matched with the shifting teeth of the shifting knob is arranged on the cylinder wall of the cylinder, and the shifting teeth of the shifting knob are positioned in the guide. When the bicycle is ridden forwards, the chain drives the chain wheel sleeve to operate forwards, the guide channel of the chain wheel sleeve can drive the shifting knob to rotate forwards, the protruding elastic sheet on the elastic gasket can drive the shifting knob to move towards the side end disc when the shifting knob rotates forwards, and therefore the shifting knob is meshed with teeth of the inner gear ring on the side end disc to drive the side end disc to rotate.
Description
Technical Field
The invention belongs to the technical field of electric bicycles and bicycles, and particularly relates to a clutch type chain wheel driving device.
Background
The rear wheel driving structure of the existing electric bicycle is that a motor wheel is installed on a rear wheel shaft, a threaded opening used for installing a flywheel (namely a chain wheel) is arranged on a motor end disc of the motor wheel, the flywheel is installed on the threaded opening through threads to be fixedly installed with the motor wheel, a circle of teeth are arranged on a flywheel outer ring, so that the flywheel outer ring is linked with a crank wheel disc through a chain, chain transmission is realized, and a ratchet pawl structure is adopted in the flywheel to guarantee the one-way transmission of riding, and the following problems exist in the flywheel driving structure:
1. the flywheel runs along with the motor wheel all the time, the working time of the flywheel is greatly prolonged, and the ratchet wheel and pawl structure in the flywheel is arranged to ensure the one-way transmission of riding, so that the ratchet wheel and pawl structure in the flywheel is easy to damage, and the service life of the flywheel is short.
2. After the flywheel is aged for long-time work, the condition of crank follow-up rotation easily occurs (when a motor wheel operates, the inner aging friction force of the flywheel is increased, the outer ring of the flywheel can be driven to rotate, then the outer ring of the flywheel drives a chain to rotate, and the chain drives the crank to follow-up rotation), the crank follow-up rotation can cause a power-assisted sensor of the vehicle to send a power-assisted signal to a controller, the controller mistakenly uses a power-assisted function for a client, the runaway is caused, and hidden dangers are brought to the safety of the client.
3. After the flywheel works and ages for a long time, when the motor wheel drives the flywheel to operate, large noise can be generated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a clutch type chain wheel driving device.
The invention is realized by the following technical scheme:
a clutch type chain wheel driving device comprises a wheel shaft, a side end disc, a chain wheel sleeve, an inner sleeve, an elastic gasket and a shifting knob;
the side end disc is rotatably arranged on the wheel shaft, and teeth are arranged on the side end disc;
the inner sleeve is fixedly arranged on the wheel shaft, and the elastic washer is fixedly arranged on the inner end surface of the inner sleeve;
the shifting knob is movably sleeved on the wheel shaft and is arranged on the inner side of the elastic washer, shifting teeth are arranged on the shifting knob, and the shifting teeth of the shifting knob can be meshed with the teeth on the side end plate after the shifting knob moves towards the side end plate;
the chain wheel sleeve is arranged on the inner sleeve through a bearing, and one end of the outer side of the chain wheel sleeve is provided with a chain wheel which is used for being connected with a chain; one end of the inner side of the chain wheel sleeve is provided with a circle of cylinder, a guide channel matched with the shifting teeth of the shifting knob is arranged on the cylinder wall of the cylinder, and the shifting teeth of the shifting knob are positioned in the guide channel.
In the technical scheme, a circle of flange is further arranged on the wall of the chain wheel sleeve, an inner gear ring is arranged at the outer side end of the side end disc, the teeth are arranged on the inner wall of the inner gear ring, and the flange on the wall of the chain wheel sleeve is located on the outer end face of the inner gear ring on the side end disc and is in clearance fit with the outer end face of the inner gear ring to form a dynamic seal for allowing external dust to enter.
In the technical scheme, the outer end disc is arranged at the outer side ends of the chain wheel sleeve and the inner sleeve and is sleeved on the wheel shaft through threads and used for realizing the positioning of the outer sides of the chain wheel sleeve and the inner sleeve.
In the technical scheme, two mounting planes are milled on the wheel shaft along the axial direction of the wheel shaft and are symmetrically arranged; the inner sleeve and the elastic washer are sleeved on the axle shaft section with the mounting plane, and the inner diameter shape of the inner sleeve and the inner diameter shape of the elastic washer are matched with the shape of the axle shaft section, so that the rotational freedom degree of the inner sleeve and the elastic washer is limited; and an expanding ladder is arranged at the terminal part of the mounting plane of the wheel shaft and used for mounting and limiting the elastic washer.
In the technical scheme, a plurality of raised elastic pieces are distributed on the elastic gasket along the circumference of the elastic gasket, the raised elastic pieces are formed by cutting the elastic gasket body, and after the elastic gasket body is cut, hollows are formed on the elastic gasket, namely each raised elastic piece corresponds to one hollow.
In the technical scheme, the face, opposite to the elastic gasket, of the shifting knob is provided with the concave cavity corresponding to the position of the convex elastic sheet on the elastic gasket, when the convex elastic sheet of the elastic gasket is completely placed into the concave cavity of the shifting knob, the shifting knob is in a separation state with teeth of the inner gear ring, when the chain drives the chain wheel sleeve to rotate, the chain wheel sleeve further drives the shifting knob to rotate, and when the shifting knob rotates, the convex elastic sheet of the elastic gasket is separated from the concave cavity of the shifting knob, so that the convex elastic sheet can enable the shifting knob to move towards the direction of the motor end plate.
In the technical scheme, the inner end face of the inner sleeve is provided with the groove corresponding to the position of the convex elastic piece on the elastic gasket, so that when the convex elastic piece on the elastic gasket is pressed towards the direction of the inner sleeve, the convex elastic piece can enter the groove on the inner end face of the inner sleeve.
In the technical scheme, the teeth of the inner gear ring on the side end disc adopt one-way transmission teeth, each tooth comprises a first tooth surface and a second tooth surface, the included angle between the first tooth surface and the tooth root surface is smaller than or equal to 90 degrees, the included angle between the second tooth surface and the tooth root surface is larger than 120 degrees, when the poking teeth of the poking knob and the first tooth surfaces of the teeth of the inner gear ring act, the poking teeth can be meshed with the teeth of the inner gear ring, the poking knob can drive the inner gear ring to rotate, when the poking teeth of the poking knob and the second tooth surfaces of the teeth of the inner gear ring act, the second tooth surfaces cannot be meshed with the poking teeth, and the poking teeth of the poking knob can withdraw out of the teeth along the.
In the above technical solution, the side end disc is fixedly mounted on a side surface of a bicycle wheel.
In the above technical solution, the side end disc is a motor end disc of the electric bicycle.
The operation method of the clutch type electric bicycle chain wheel driving mechanism is as follows:
when a rider rides forward, when the chain drives the chain sleeve to rotate in the forward direction, the guide channel of the chain sleeve can drive the shifting knob to rotate in the forward direction, and when the shifting knob rotates in the forward direction, the raised elastic sheet on the elastic washer can drive the shifting knob to move towards the side end disc, so that the shifting knob is meshed with teeth of the inner gear ring on the side end disc, and the side end disc is driven to rotate;
when the rider stops riding, the bicycle body continues to move forwards, the side end disc rotates forwards along with the bicycle wheel, and the second tooth surface of the tooth of the annular gear of the side end disc can drive the shifting teeth of the shifting knob to retreat out of the tooth along the second tooth surface, so that the sprocket sleeve cannot be driven to rotate;
when the pedal is trampled backwards by a rider, the chain drives the chain wheel sleeve to run reversely, the guide channel of the chain wheel sleeve can drive the shifting knob to rotate reversely, the raised elastic sheet on the elastic washer can drive the shifting knob to move reversely to the side end disc when the shifting knob rotates reversely, however, when the shifting knob rotates reversely, the shifting teeth of the shifting knob are acted on the second tooth surfaces of the teeth of the inner gear ring of the side end disc, therefore, the shifting knob can not drive the reverse movement of the side end disc, but the second tooth surfaces of the teeth of the side end disc can make the shifting teeth of the shifting knob to retreat from the teeth along the second tooth surfaces, and the shifting knob compresses the raised elastic sheet on the elastic washer.
The invention has the advantages and beneficial effects that:
1. the chain wheel (chain wheel sleeve) of the invention has no risk of wire withdrawal and separation.
2. The chain wheel (namely the chain wheel sleeve) can be meshed with the motor wheel for transmission only in the forward riding state, so that the working time of the chain wheel is greatly reduced, and the service life of the chain wheel is prolonged; and the running noise of the chain wheel is reduced, and the follow-up rotation is avoided.
3. The chain wheel (namely the chain wheel sleeve) is not internally provided with the ratchet wheel and pawl mechanism, so that the working stability and the service life of the chain wheel are improved.
4, the chain wheel of the invention is directly installed on the wheel shaft, and compared with the traditional chain wheel which is installed on the threaded opening of the motor end disc, the inner diameter of the chain wheel is smaller, therefore, the size of the chain wheel is favorably reduced, and the design of the vehicle model is more beautiful.
Drawings
Fig. 1 is a perspective view of the clutch type sprocket driving apparatus of the present invention.
Fig. 2 is a cross-sectional view of the clutch sprocket drive of the present invention.
Fig. 3 is a schematic perspective view of the clutch type sprocket driving device of the present invention with the motor end disc removed.
Fig. 4 is a schematic view of an elastic gasket in the present invention.
Fig. 5 is a schematic view of the toggle button of the present invention.
Fig. 6 is a schematic view of the inner sleeve and axle mounting of the clutch sprocket drive of the present invention.
Fig. 7 is a schematic view of the combination of the inner sleeve, the axle, the toggle and the motor end disc of the clutch type sprocket driving device of the present invention.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.
Example one
Referring to the attached drawings, the clutch type chain wheel driving device comprises a wheel shaft 1, a motor end disc 2, a chain wheel sleeve 3, an inner sleeve 4, an elastic washer 5 and a poking knob 6.
The motor end disc 2 is rotatably arranged on the wheel shaft 1, the outer side end of the motor end disc is connected with an inner gear ring 2-1 through threads, and the inner wall of the inner gear ring is provided with a circle of teeth a, or the inner gear ring and the motor end disc can be of an integrated structure and do not need to be connected through threads.
The inner sleeve 4 is fixedly arranged on the wheel shaft 1, and the elastic washer 5 is fixedly arranged on the inner end surface of the inner sleeve (the inner end surface of the inner sleeve refers to one surface of the inner sleeve facing the motor end disc).
The shifting knob 6 is movably sleeved on the wheel shaft 1 and is installed on the inner side of the elastic washer 5 (the inner side of the elastic washer refers to the side, facing the motor end plate direction, of the elastic washer), two shifting teeth 6-1 are arranged on the shifting knob 6, and after the shifting knob 6 moves a certain distance to the motor end plate direction along the wheel shaft direction, the shifting teeth 6-1 of the shifting knob 6 can be meshed with teeth a of an inner gear ring of the motor end plate.
Further, an outer end disc 8 is arranged at the outer side end of the sprocket sleeve 3 and the inner sleeve 4, and the outer end disc is sleeved on the wheel shaft 1 through threads and used for realizing the outer side positioning of the sprocket sleeve 3 and the inner sleeve 4.
Further, the outer shaft section of the wheel shaft 1 is provided with threads for mounting the outer end disc 8, and the wheel shaft is milled with two mounting planes 1-1 along the axial direction thereof, and the two mounting planes are symmetrically arranged; the inner sleeve 4 and the elastic washer 5 are sleeved on a wheel axle section with the mounting plane, and the inner diameter shape of the inner sleeve 4 and the inner diameter shape of the elastic washer 5 are matched with the shape of the wheel axle section, so that the rotational freedom of the inner sleeve and the elastic washer is limited, and the inner sleeve and the elastic washer cannot rotate relative to a wheel axle; an expanding ladder 1-2 is arranged at the terminal part of the mounting plane of the wheel axle and is used for mounting and limiting the elastic washer 5, namely after the inner sleeve and the elastic washer are sleeved on the wheel axle section with the mounting plane, the outer end disc 8 is spirally mounted into the wheel axle, so that the elastic washer 5 tightly props against the expanding ladder 1-2, and the outer end disc 8 tightly props against the inner sleeve 4, thereby realizing the fixed mounting of the inner sleeve and the elastic washer with the wheel axle.
Further, referring to fig. 4, a plurality of protruding elastic pieces 5-1 are distributed on the elastic washer 5 along the circumference thereof, the protruding elastic pieces are formed by punching the elastic washer body, and after punching, hollowing is formed on the elastic washer, that is, each protruding elastic piece corresponds to one hollow.
Further, referring to fig. 5, a concave cavity 6-2 corresponding to the position of the protruding elastic sheet 5-1 on the elastic washer is arranged on the surface of the toggle 6 opposite to the elastic washer 5, when the protruding elastic sheet 5-1 of the elastic washer 5 is completely placed in the concave cavity 6-2 of the toggle 6, the toggle is in a separation state from the teeth a of the inner gear ring, when the chain drives the sprocket sleeve 3 to rotate, the sprocket sleeve 3 further drives the toggle 6 to rotate, and when the toggle 6 rotates, the protruding elastic sheet 5-1 of the elastic washer 5 is separated from the concave cavity 6-2 of the toggle 6, so that the protruding elastic sheet 5-1 can drive the toggle 6 to move towards the motor end plate.
Further, referring to figure 6, the inner end surface of the inner sleeve 4 is provided with recesses 4-1 corresponding in position to the raised resilient tabs on the resilient washer, so that the raised resilient tabs 5-1 on the resilient washer can enter the recesses 4-1 on the inner end surface of the inner sleeve when pressed towards the inner sleeve 4.
Further, referring to fig. 7, the teeth a of the inner gear ring on the end disc of the motor adopt one-way transmission teeth, each tooth includes a first tooth surface and a second tooth surface, an included angle between the first tooth surface and the tooth root surface is less than or equal to 90 degrees, an included angle between the second tooth surface and the tooth root surface is greater than 120 degrees, when the dialing tooth of the dialing knob 6 and the first tooth surface of the teeth of the inner gear ring act, the dialing tooth can be engaged with the teeth of the inner gear ring, the dialing knob 6 can drive the inner gear ring to rotate, when the dialing tooth of the dialing knob 6 and the second tooth surface of the teeth of the inner gear ring act, the second tooth surface cannot be engaged with the dialing tooth, and the dialing tooth of the dialing knob 6 can withdraw from the tooth along the second tooth surface.
The operation method of the clutch type chain wheel driving device is as follows:
when riding passerby and riding forward, when chain drive sprocket sleeve 3 forward operation, sprocket sleeve 3's guide channel can drive to dial and turn round 6 forward rotations, dials and turns round protruding flexure strip on 5 when 6 rotate and can drive to dial and turn round 6 and to motor end plate direction motion, and then realizes dialling to turn round 6 and motor end plate 2 and go up the tooth a meshing of ring gear, driving motor end plate 2 rotates.
When the rider stops riding, the bicycle body continues to move forwards, the motor end disc 2 rotates forwards, and the second tooth surface of the teeth of the annular gear of the motor end disc 2 can enable the shifting teeth of the shifting knob 6 to retreat out of the teeth along the second tooth surface, so that the chain wheel sleeve 3 cannot be driven to rotate.
When a rider treads a pedal backwards, the chain drives the chain wheel sleeve to run reversely, the guide channel of the chain wheel sleeve 3 can drive the shifting knob 6 to rotate reversely, the raised elastic sheet on the elastic washer can drive the shifting knob 6 to move reversely towards the motor end disc when the shifting knob 6 rotates reversely, however, as the shifting teeth of the shifting knob 6 act on the second tooth surface of the teeth of the ring gear of the motor end disc 2 when the shifting knob 6 rotates reversely, the shifting knob 6 cannot drive the motor end disc to move reversely, but the second tooth surface of the teeth of the motor end disc can drive the shifting teeth of the shifting knob 6 to retreat out of the teeth along the second tooth surface, and meanwhile, the shifting knob 6 compresses the raised elastic sheet on the raised elastic washer (the raised elastic sheet enters the groove 4-1 of the inner end surface of the inner sleeve).
Example two
The embodiment is directed to electric bicycle, and this device also can be applied to bicycle technical field, and the difference with the embodiment one lies in: the motor end disc 2 in the first embodiment is replaced by a side end disc, the side end disc is installed on the side face of a bicycle wheel, the outer side end of the side end disc is also provided with an inner gear ring, the inner wall of the inner gear ring is also provided with a ring of teeth, and the rest of the structure and the working principle are the same as those of the first embodiment.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (10)
1. A clutch type sprocket drive device characterized in that: comprises a wheel shaft, a side end disc, a chain wheel sleeve, an inner sleeve, an elastic washer and a shifting knob;
the side end disc is rotatably arranged on the wheel shaft, and teeth are arranged on the side end disc;
the inner sleeve is fixedly arranged on the wheel shaft, and the elastic washer is fixedly arranged on the inner end surface of the inner sleeve;
the shifting knob is movably sleeved on the wheel shaft and is arranged on the inner side of the elastic washer, shifting teeth are arranged on the shifting knob, and the shifting teeth of the shifting knob can be meshed with the teeth on the side end plate after the shifting knob moves towards the side end plate;
the chain wheel sleeve is arranged on the inner sleeve through a bearing, and one end of the outer side of the chain wheel sleeve is provided with a chain wheel which is used for being connected with a chain; one end of the inner side of the chain wheel sleeve is provided with a circle of cylinder, a guide channel matched with the shifting teeth of the shifting knob is arranged on the cylinder wall of the cylinder, and the shifting teeth of the shifting knob are positioned in the guide channel.
2. The clutch sprocket drive apparatus as set forth in claim 1, wherein: the wall of the chain wheel sleeve is also provided with a circle of flange, an inner gear ring is arranged at the outer side end of the side end disc, the inner wall of the inner gear ring is provided with teeth, and the flange on the wall of the chain wheel sleeve is positioned on the outer end face of the inner gear ring on the side end disc and is in clearance fit with the outer end face of the inner gear ring to form dynamic seal.
3. The clutch sprocket drive apparatus as set forth in claim 1, wherein: and the outer end of each of the sprocket sleeve and the inner sleeve is provided with an outer end disc, and the outer end discs are sleeved on the wheel shaft through threads and used for realizing the positioning of the outer sides of the sprocket sleeve and the inner sleeve.
4. The clutch sprocket drive apparatus as set forth in claim 1, wherein: the wheel shaft is milled with two mounting planes along the axial direction, and the two mounting planes are symmetrically arranged; the inner sleeve and the elastic washer are sleeved on the axle section with the mounting plane, and the inner diameter shape of the inner sleeve and the inner diameter shape of the elastic washer are matched with the shape of the axle section; and an expanding ladder is arranged at the terminal part of the mounting plane of the wheel shaft and used for mounting and limiting the elastic washer.
5. The clutch sprocket drive apparatus as set forth in claim 1, wherein: a plurality of raised elastic pieces are distributed on the elastic washer along the circumference of the elastic washer, the raised elastic pieces are formed by punching the elastic washer body, and hollow parts are formed on the elastic washer after punching.
6. The clutch sprocket drive apparatus as set forth in claim 5, wherein: set up on dialling the one side relative with the elastic washer that turns round with the protruding flexure strip position on the elastic washer cavity that corresponds, when the protruding flexure strip of elastic washer was put into completely to dial when turning round the cavity, dial to turn round and be in with the detached state of tooth, rotate as chain drive sprocket sleeve, sprocket sleeve and then drive dial to turn round the rotation, when dialling to turn round the rotation, the protruding flexure strip of elastic washer breaks away from to dial the cavity of turning round, and then protruding flexure strip can make to dial to turn round and move to motor end plate direction.
7. The clutch sprocket drive apparatus as set forth in claim 6, wherein: the inner end surface of the inner sleeve is provided with a groove corresponding to the position of the convex elastic sheet on the elastic gasket, and when the convex elastic sheet on the elastic gasket is pressed towards the direction of the inner sleeve, the convex elastic sheet can enter the groove on the inner end surface of the inner sleeve.
8. The clutch sprocket drive apparatus as set forth in claim 1, wherein: the teeth on the side end disc adopt one-way transmission teeth.
9. The clutch sprocket drive apparatus as set forth in claim 1, wherein: the side end disc is fixedly mounted on the side surface of the bicycle wheel.
10. The clutch sprocket drive apparatus as set forth in claim 1, wherein: the side end disc is a motor end disc of the electric bicycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021535243.2U CN212423372U (en) | 2020-07-29 | 2020-07-29 | Clutch type chain wheel driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021535243.2U CN212423372U (en) | 2020-07-29 | 2020-07-29 | Clutch type chain wheel driving device |
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| Publication Number | Publication Date |
|---|---|
| CN212423372U true CN212423372U (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021535243.2U Expired - Fee Related CN212423372U (en) | 2020-07-29 | 2020-07-29 | Clutch type chain wheel driving device |
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| CN (1) | CN212423372U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111776128A (en) * | 2020-07-29 | 2020-10-16 | 天津美派电动科技有限公司 | Clutch type chain wheel driving device |
-
2020
- 2020-07-29 CN CN202021535243.2U patent/CN212423372U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111776128A (en) * | 2020-07-29 | 2020-10-16 | 天津美派电动科技有限公司 | Clutch type chain wheel driving device |
| CN111776128B (en) * | 2020-07-29 | 2024-04-30 | 天津美派电动科技有限公司 | Clutch type chain wheel driving device |
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Granted publication date: 20210129 |