CN111336193A - One-way transmission structure and solar protection devices - Google Patents
One-way transmission structure and solar protection devices Download PDFInfo
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- CN111336193A CN111336193A CN202010254371.8A CN202010254371A CN111336193A CN 111336193 A CN111336193 A CN 111336193A CN 202010254371 A CN202010254371 A CN 202010254371A CN 111336193 A CN111336193 A CN 111336193A
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- 229910052751 metal Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D41/00—Freewheels or freewheel clutches
- F16D41/12—Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like
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Abstract
The invention relates to the technical field of one-way transmission, and discloses a one-way transmission structure and a sun shading device. Wherein one-way transmission structure includes: the input piece is provided with a first push block and a second push block which are distributed at intervals; the output piece is arranged on the input piece; the shell is sleeved on the input member and the output member, and a friction surface is arranged in the shell; the transmission assembly comprises a first pawl, a second pawl and an elastic piece, one end of the elastic piece is abutted to the first pawl, the other end of the elastic piece is abutted to the second pawl, the extending directions of the first pawl and the second pawl are gradually arranged towards directions close to each other along the direction departing from the output piece, and under a natural state, the elastic piece is compressed, and the first pawl and the second pawl can be abutted to friction surfaces. The transmission assembly of the one-way transmission structure can enable the input part to transmit power to the output part along the first rotation direction or the second rotation direction, and the transmission assembly has larger locking force and higher reliability.
Description
Technical Field
The invention relates to the technical field of one-way transmission, in particular to a one-way transmission structure and a sun shading device.
Background
A tensioning system for retracting and releasing elastic force of a small gear box is commonly used in a sun-shading product, the external tension force of an elastic force arm needs to be overcome in the contraction process of the tensioning system, locking can be achieved at any position, the elastic force arm is prevented from loosening and popping, and therefore the tensioning system is required to be capable of transmitting an output piece in a transmission direction when power is transmitted from an input piece in a forward direction, and a self-locking function can be achieved when power is transmitted from the output piece in a reverse direction, namely the gear box is required to have a one-way transmission function.
At present, a commonly used tensioning system in the industry is a spring tensioning self-locking gear box, as shown in fig. 1, an input part is a driving shaft 1 ', an output part is a gear 4 ', the gear 4 ' is arranged on the driving shaft 1 ', the driving shaft 1 ' can rotate relative to the gear 4 ', two ends of a torsion spring 2 ' are both positioned in a gap between the driving shaft 1 ' and the gear 4 ', one end of the gear 4 ' close to the driving shaft 1 ' is provided with a limiting bump, and a locking sleeve 3 ' is sleeved on the driving shaft 1 '. Specifically, when the driving shaft 1 'rotates clockwise or counterclockwise, the torsion spring 2' rotates along with the driving shaft 1 'to abut against the limiting bump on the gear 4', so that the torsion spring 2 'contracts to be separated from the locking sleeve 3', and the power transmission from the driving shaft 1 'to the gear 4' is realized; when the gear 4 ' rotates clockwise or anticlockwise, the torsion spring 2 ' is unfolded to lock the locking sleeve 3 ', so that self-locking is realized. When the self-locking is realized only by adopting the tensioning self-locking gear box of the torsion spring 2 ', the problems of insufficient locking force, insufficient anti-vibration capability and the like exist, the tensioning torsion spring 2' is likely to be loosened and popped up in use, and the reliability of the product is low.
In the prior art, a part of sun-shading products are additionally provided with a locking device on the basis of using a spring to tension a self-locking gear box, and an elastic arm is directly locked when the products are retracted, so that the products are prevented from being loosened and popped up. The added locking device makes the structure of the product relatively complex, and the reliability of the sunshade product is reduced because the action of the locking structure may affect the realization of other functions on the product.
Disclosure of Invention
Based on the above, an object of the present invention is to provide a unidirectional transmission structure, which solves the problems of small locking force, weak anti-vibration capability and low reliability.
Another object of the present invention is to provide a sunshade device with improved reliability of the product.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a one-way transmission structure, comprising: the input part is provided with a first push block and a second push block which are distributed at intervals, and the first push block and the second push block extend along the axial direction of the input part; the output piece is arranged on the input piece; the shell is sleeved on the input member and the output member, and the inner side wall of the shell is provided with a friction surface; the transmission assembly comprises a first pawl, a second pawl and an elastic piece, one end of the elastic piece is abutted to the first pawl, the other end of the elastic piece is abutted to the second pawl, the extending directions of the first pawl and the second pawl are gradually arranged towards the directions close to each other along the direction departing from the output piece, the first pawl and the second pawl are sequentially distributed on the input piece along a first rotating direction, and in a natural state, the elastic piece is compressed and both the first pawl and the second pawl can be abutted to the friction surface; when the first push block of the input piece pushes the first pawl to be separated from the friction surface, the output piece and the transmission assembly can rotate along the first rotating direction of the friction force generated by the second pawl and the friction surface; when the second push block of the input piece pushes the second pawl to be separated from the friction surface, the output piece and the transmission assembly can rotate along a second rotation direction of the friction force generated by the first pawl and the friction surface; when the output member is driven to rotate along the first rotating direction, the first pawl abuts against the friction surface to enable the output member to be locked; when the output member is driven to rotate along the second rotating direction, the second pawl abuts against the friction surface to enable the output member to be locked.
As a preferred scheme of a unidirectional transmission structure, be equipped with on the output piece along the lug of self radial extension, when the input piece rotates along first direction of rotation the second ejector pad can with the lug butt is in order to promote the output piece rotates, when the input piece rotates along the second direction of rotation the first ejector pad can with the lug butt is in order to promote the output piece rotates.
As a preferred scheme of a one-way transmission structure, a through hole is formed in the output piece, the central axis of the through hole is perpendicular to the central axis of the output piece, and the elastic piece penetrates through the through hole.
As a preferred scheme of the one-way transmission structure, the elastic element is any one of a pressure spring, a torsion spring or a spring sheet.
As a preferable mode of the one-way transmission structure, a plurality of internal teeth are provided inside the housing, a plurality of internal teeth are provided along the inner circumference of the housing, and the surface of the internal teeth forms the friction surface.
As an one-way transmission structure's preferred scheme, be equipped with first mounting hole, second mounting hole on the output piece, with the first groove of dodging of first mounting hole intercommunication and with the second groove of dodging of second mounting hole intercommunication, the one end of first pawl install in the first mounting hole, the other end is to stretching out the first direction of dodging the groove is extended, the one end of second pawl install in the second mounting hole, the other end is to stretching out the second is dodged the direction in groove and is extended.
As a preferable scheme of the one-way transmission structure, the first pawl comprises a first rotating shaft and a first pawl body which are connected, the first rotating shaft is rotatably installed in the first installation hole, the second pawl comprises a second rotating shaft and a second pawl body which are connected, and the second rotating shaft is rotatably installed in the second installation hole.
As a preferred scheme of a one-way transmission structure, a first connecting hole is formed in the input piece, a connecting column is arranged on the output piece, and the connecting column is assembled in the first connecting hole in a clearance mode.
As a preferred scheme of a one-way transmission structure, a second connecting hole is formed in the output piece, the second connecting hole comprises a polygonal hole, and the second connecting hole is used for installing an input shaft of the gearbox.
The invention also discloses a sun-shading device which comprises the one-way transmission structure in any scheme.
The invention has the beneficial effects that: the transmission assembly of the one-way transmission structure can enable the input part to transmit power to the output part along the first rotation direction or the second rotation direction, and cannot realize the effect of transmitting the power from the output part to the input part.
The sun-shading device disclosed by the invention has the unidirectional transmission structure, so that the reliability of the sun-shading device is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic view of the prior art with a one-way transmission configuration of the present invention;
FIG. 2 is a schematic diagram of a one-way transmission configuration provided by an embodiment of the present invention;
FIG. 3 is a disassembled view of a one-way transmission configuration provided by an embodiment of the present invention;
FIG. 4 is a schematic view of a housing of a one-way transmission configuration provided by an embodiment of the present invention;
FIG. 5 is a schematic view of a unidirectional transmission structure provided in accordance with an embodiment of the present invention with the housing removed;
FIG. 6 is a schematic view of a first pawl provided in accordance with an embodiment of the present invention;
fig. 7 is a schematic diagram of an output element and a bump capable of mounting a spring piece according to another embodiment of the invention.
In the figure:
1', a driving shaft; 2', a torsion spring; 3', a locking sleeve; 4', a gear;
11. an input member; 1101. a first connection hole; 12. a first push block; 1201. a fifth bevel; 13. a second push block;
21. an output member; 2101. a first mounting hole; 2102. a second mounting hole; 2103. a first avoidance slot; 2104. a second avoidance slot; 2105. a second connection hole; 2106. a through groove; 22. a bump; 23. connecting columns;
3. a housing; 301. a friction surface;
4. a transmission assembly; 41. a first pawl; 4101. a third inclined plane; 4102. a fourth slope; 4103. a sixth slope; 411. a first rotating shaft; 412. a first pawl body; 42. a second pawl; 421. a second rotating shaft; 422. a second pawl body; 43. an elastic member.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a one-way transmission structure for a sun-shading device, as shown in fig. 2 to 5, the one-way transmission structure comprises an input member 11, an output member 21, a housing 3 and a transmission assembly 4, the input member 11 is provided with a first push block 12 and a second push block 13 which are distributed at intervals, the first push block 12 and the second push block 13 extend along the axial direction of the input member 11, the output member 21 is arranged on the input member 11 and can rotate relative to the input member 11, the housing 3 is sleeved on the input member 11 and the output member 21, and the inner side wall of the housing 3 is provided with a friction surface 301. The transmission assembly 4 comprises a first pawl 41, a second pawl 42 and an elastic member 43, one end of the elastic member 43 is abutted to the first pawl 41, the other end of the elastic member 43 is abutted to the second pawl 42, the extending directions of the first pawl 41 and the second pawl 42 are gradually arranged towards the approaching direction along the direction departing from the output member 21, the first pawl 41 and the second pawl 42 are sequentially distributed on the input member 11 along the first rotating direction of the input member 11 from the first push block 12 to the second push block 13, and in a natural state, the elastic member 43 is compressed, and the first pawl 41 and the second pawl 42 can be abutted to the friction surface 301.
It should be noted that, in the embodiment, the first push block 12 and the second push block 13 are integrally injection-molded on the input member 11, and the first push block 12 and the second push block 13 are both circular-ring push blocks, so that the connection strength between the first push block 12 and the input member 11 and the connection strength between the second push block 13 and the first push block 12 are increased, the probability that the first push block 12 or the second push block 13 falls off from the input member 11 due to the fact that the first push block 12 or the second push block 13 pushes the bump 22 too much is reduced, and the service life of the unidirectional transmission structure is prolonged.
Specifically, when the first pushing block 12 of the input member 11 pushes the first pawl 41 to disengage from the friction surface 301, the output member 21 and the transmission assembly 4 can rotate in a first rotation direction in which the second pawl 42 generates a friction force with the friction surface 301; when the second pushing block 13 of the input member 11 pushes the second pawl 42 to disengage from the friction surface 301, the output member 21 and the transmission assembly 4 can rotate in a second rotation direction in which the first pawl 41 generates a friction force with the friction surface 301; when the output member 21 is driven to rotate along the first rotation direction, the first pawl 41 is abutted to the friction surface 301 so that the output member 21 is locked; when the output member 21 is driven to rotate in the second rotational direction, the second pawls 42 abut against the frictional surfaces 301 to lock the output member 21. Therefore, the one-way transmission structure of the present embodiment can only realize the transmission of power from the input member 11 to the output member 21 through the transmission assembly 4 in the first rotation direction or the second rotation direction, but cannot realize the transmission of power from the output member 21 to the input member 11 through the transmission assembly 4.
In the present embodiment, the input member 11 is a driving disk, and the output member 21 is a driven disk. The first rotational direction is clockwise when the one-way transmission structure is placed as shown in fig. 5, i.e. the clockwise direction is the direction shown by the arrow in fig. 5, and the second rotational direction is counterclockwise when the one-way transmission structure is placed as shown in fig. 5, i.e. the counterclockwise direction is the opposite direction to the direction shown by the arrow in fig. 5.
The one-way transmission structure that this embodiment provided compares with the one-way transmission structure who is applicable to the motor that prior art exists, the structure is simpler, the cost is lower, mostly be applicable to low-speed moving application scene, drive assembly 4 can make input member 11 follow the transmission power of first direction of rotation or second direction of rotation to output 21, and can not realize the effect of output 21 to input member 11 transmission power, drive assembly 4 who comprises first pawl 41, second pawl 42 and elastic component 43 compares with the torsional spring that prior art adopted, the locking force of the drive assembly 4 that this embodiment provided is bigger, even this one-way transmission structure takes place to rock, can not take place relative rotation between input member 11 and the output 21 of this one-way transmission structure, the reliability of this one-way transmission structure has still been increased.
Specifically, the elastic member 43 is a pressure spring, and the pressure spring is always in a compressed state, so that one end of the pressure spring can always abut against the first pawl 41, and the other end of the pressure spring can always abut against the second pawl 42, and therefore the elastic member 43 is conveniently connected with the first pawl 41 and the second pawl 42. Of course, in other embodiments of the present invention, one end of the elastic member 43 may be connected to the first pawl 41, and the other end may be connected to the second pawl 42, which is set according to actual requirements.
Further, the output member 21 of the present embodiment is provided with a through hole (not shown in the drawings), a central axis of the through hole is perpendicular to a central axis of the output member 21, and the elastic member 43 is disposed through the through hole. Of course, in other embodiments of the present invention, the elastic element 43 may also be a torsion spring, a spring plate, or another elastic element 43 with elasticity, which is specifically selected according to actual needs. Specifically, when the elastic element 43 is an elastic piece (not shown in the figure), the elastic piece includes a first elastic piece, a second elastic piece, and a third elastic piece, the first elastic piece and the third elastic piece are respectively disposed at two opposite ends of the second elastic piece and extend toward each other, the first elastic piece and the third elastic piece are respectively located at the same side of the second elastic piece, at this time, as shown in fig. 7, the through hole on the input element 11 is a through slot 2106, the second elastic piece is disposed in the through slot 2106, the first elastic piece abuts against the first pawl 41 so that the first pawl 41 presses the first elastic piece, and the third elastic piece abuts against the second pawl 42 so that the second pawl 42 presses the second elastic piece.
In order to facilitate the installation of the elastic element 43, the output element 21 of the embodiment is provided with a first inclined surface (not shown in the drawings) and a second inclined surface (not shown in the drawings) which are connected in sequence, a joint of the first inclined surface and the second inclined surface is an inward-concave obtuse angle, two ends of the elastic element 43 respectively penetrate through the two second inclined surfaces, and the arrangement ensures the installation strength of the elastic element 43 on the output element 21 and prolongs the service life of the output element 21. Accordingly, as shown in fig. 5, the first pawl 41 is provided with a third inclined surface 4101 and a fourth inclined surface 4102 corresponding to the first inclined surface and the second inclined surface, respectively, so as to ensure that the first pawl 41 can be tightly attached to the output member 21 when the first pushing block 12 presses the first pawl 41. The same specific structure of the second pawl 42 is the same as that of the first pawl 41.
In order to facilitate the first pushing block 12 to push the first pawl 41, as shown in fig. 5, the first pushing block 12 is provided with a fifth inclined surface 1201, the fifth inclined surface 1201 extends toward the direction approaching the transmission assembly 4 in the direction of increasing the diameter of the input member 11, the first pawl 41 is provided with a sixth inclined surface 4103 corresponding to the fifth inclined surface 1201, when the first pushing block 12 pushes the first pawl 41, the fifth inclined surface 1201 gradually engages with the sixth inclined surface 4103 to push the first pawl 41 to move toward the direction compressing the elastic member 43, so that the first pawl 41 is separated from the friction surface 301. When the first push block 12 has the same pushing force on the first pawl 41, the pressure of the surface-to-surface contact mode is smaller than that of the line-to-line contact mode, the extrusion of the first push block 12 on the first pawl 41 is reduced, namely, the probability that the first pawl 41 is damaged due to the fact that the pushing force of the first push block 12 on the first pawl 41 is too large is reduced, and the service life of the first pawl 41 is prolonged. Accordingly, the specific structures of the second push block 13 and the second pawl 42 are the same as those of the first push block 12 and the first pawl 41, respectively.
Specifically, when the input member 11 rotates in the first rotation direction, the first pushing block 12 can push the first pawl 41 to move in a direction approaching to the second pawl 42, the elastic member 43 is compressed continuously, the first pawl 41 is disengaged from the friction surface 301 of the housing 3, and at this time, the input member 11 can drive the output member 21 and the transmission assembly 4 to rotate in the first rotation direction, and at this time, the second pawl 42 generates friction with the friction surface 301; when the input member 11 rotates in the second rotation direction, the first pushing block 12 can push the second pawl 42 to move toward the first pawl 41, the elastic member 43 is compressed continuously, the second pawl 42 disengages from the friction surface 301 of the housing 3, and the input member 11 can drive the output member 21 and the transmission assembly 4 to rotate in the second rotation direction, at this time, the first pawl 41 generates friction with the friction surface 301.
Further, as shown in fig. 3, the output member 21 of the present embodiment is provided with a first mounting hole 2101, a second mounting hole 2102, a first escape groove 2103 communicating with the first mounting hole 2101, and a second escape groove 2104 communicating with the second mounting hole 2102, wherein one end of the first pawl 41 is mounted in the first mounting hole 2101, and the other end extends in a direction protruding out of the first escape groove 2103, and one end of the second pawl 42 is mounted in the second mounting hole 2102, and the other end extends in a direction protruding out of the second escape groove 2104.
As shown in fig. 3, the first pawl 41 of the present embodiment includes a first rotating shaft 411 and a first pawl body 412 that are connected, the first rotating shaft 411 and the first pawl body 412 are integrally formed into the first pawl 41, the first rotating shaft 411 is rotatably installed in a first installation hole 2101, the second pawl 42 includes a second rotating shaft 421 and a second pawl body 422 that are connected, the second rotating shaft 421 is rotatably installed in a second installation hole 2102, and the second rotating shaft 421 and the second pawl body 422 are integrally formed into the second pawl 42. When the first pawl 41 and the second pawl 42 are attached to the input member 11, the first pawl 41 is inserted into the first mounting hole 2101 and the first escape groove 2103 along the central axis direction of the input member 11, and the second pawl 42 is inserted into the second mounting hole 2102 and the second escape groove 2104 along the central axis direction of the input member 11, so that the attachment is facilitated.
As shown in fig. 5, the lower side surface of the first pawl body 412 is spaced from the output member 21 to reduce the friction between the first pawl 41 and the output member 21 when the first pawl 41 rotates relative to the output member 21, so as to reduce the wear of the first pawl 41 and the output member 21, increase the smoothness of the rotation of the first pawl 41 relative to the output member 21, and prolong the service life of the one-way transmission structure, and similarly, the lower side surface of the second pawl body 422 is spaced from the output member 21 to reduce the wear of the second pawl 42 and the output member 21, so as to further prolong the service life of the one-way transmission structure.
As shown in fig. 3 and 4, the housing 3 of the present embodiment has a plurality of internal teeth provided inside, the plurality of internal teeth are provided along the inner circumferential direction of the housing 3, the friction surfaces 301 are formed on the surfaces of the internal teeth, the tooth grooves are formed on the friction surfaces 301, and both the first pawls 41 and the second pawls 42 can be brought into contact with the internal teeth in a natural state. A first corner is arranged on the first pawl 41, and the first pawl 41 at the first corner can be attached to the internal teeth so as to ensure that the first pawl 41 can be firmly abutted to the friction surface 301 when the output member 21 is rotated in the first rotating direction, and the phenomenon that the self-locking function of the one-way transmission structure is disabled because the first pawl 41 is separated from the friction surface 301 is prevented; the second pawl 42 is provided with a second corner, and the second pawl 42 at the second corner can be attached to the internal teeth, so that when the output member 21 is rotated in the second rotation direction, the second pawl 42 can be firmly abutted against the friction surface 301, and the phenomenon that the self-locking function of the one-way transmission structure is disabled due to the fact that the second pawl 42 is separated from the friction surface 301 is prevented. Of course, in other embodiments, the friction surface 301 is formed by other friction surfaces 301 formed by a plurality of protrusions, and the specific structure and shape of the protrusions are set according to the actual needs of the user.
Specifically, when the input member 11 rotates in the first rotation direction, the first push block 12 on the input member 11 pushes the first pawl 41, wherein a line connecting a rotation center of the first pawl 41 to a first corner of the friction surface 301 forms a first rotation radius R1, as shown in fig. 6, since an end surface of the first pawl 41 is perpendicular to the first rotation radius R1, the end surface of the top portion of the first pawl 41 rotates with the radius R1 to disengage from the tooth groove on the friction surface 301, and similarly, when the input member 11 rotates in the second rotation direction, the second pawl 42 disengages from the friction surface 302 in the same manner as the first pawl 41. When the output member 21 rotates in the first rotation direction, since a line connecting the rotation center of the output member 21 to the first corner forms a second rotation radius R2, as shown in fig. 5, since the end surface of the first pawl 41 is not perpendicular to the second rotation radius R2, the first pawl 41 is locked in the tooth socket and cannot be disengaged, and accordingly, when the output member 21 rotates in the second rotation direction, the second pawl 42 is locked on the friction surface 302 in the same principle as the first pawl 41.
As shown in fig. 3 and 5, the output member 21 of the present embodiment is further provided with a protrusion 22, and the protrusion 22 is integrally injection-molded on the output member 21 to increase the connection strength between the protrusion 22 and the output member 21, so that the probability that the protrusion 22 falls off from the output member 21 due to an excessive pushing force of the first pushing block 12 or the second pushing block 13 on the protrusion 22 is reduced, and the service life of the unidirectional transmission structure is prolonged. Specifically, the projection 22 extends in the radial direction of the input member 11, the projection 22 is spaced from the friction surface 301, the second push block 13 can abut against the projection 22 to push the output member 21 to rotate when the input member 11 rotates in the first rotation direction, and the first push block 12 can abut against the projection 22 to push the output member 21 to rotate when the input member 11 rotates in the second rotation direction.
Of course, in other embodiments of the present invention, the number of the protrusions 22 on the output member 21 may also be two, the two protrusions 22 are disposed on the output member 21 at intervals, the second pushing block 13 can abut against one of the protrusions 22 to push the output member 21 to rotate when the input member 11 rotates in the first rotation direction, and the first pushing block 12 can abut against the other protrusion 22 to push the output member 21 to rotate when the input member 11 rotates in the second rotation direction. Or, in other embodiments, the bumps 22 are not provided, when the input member 11 rotates in the first rotation direction, the first push block 12 can abut against the first pawl 41 to push the output member 21 to rotate, and when the input member 11 rotates in the second rotation direction, the second push block 13 can abut against the second pawl 42 to push the output member 21 to rotate, which is suitable for a scenario with a low rotation speed, and the number of the bumps 22 is specifically set according to actual needs.
In order to mount the output member 21 on the output member 21, as shown in fig. 3, a first connection hole 1101 is provided on the input member 11, a connection post 23 is provided on the output member 21, and the connection post 23 is clearance-fitted in the first connection hole 1101 so that the input member 11 can be driven relative to the output member 21. As shown in fig. 5, the output member 21 is provided with a second connection hole 2105, the second connection hole 2105 is a regular hexagonal hole, and the second connection hole 2105 is used for mounting an input shaft of the gearbox, so as to realize power transmission from the output member 21 to the input shaft of the gearbox. Of course, in other embodiments, the shape of the second connection hole 2105 may be other shapes as long as the output member 21 can transmit power to the gear box.
When the unidirectional transmission structure of the embodiment transmits power from the input member 11 to the output member 21, the specific process is as follows:
when the output member 21 is rotated without using an external force, the first pawls 41 and the second pawls 42 are in an open state under the action of the elastic member 43, and at this time, the first pawls 41 and the second pawls 42 respectively abut against the friction surface 301;
when the input member 11 is rotated clockwise as shown in fig. 5, the input member 11 rotates relative to the output member 21, the first push block 12 on the input member 11 pushes the first pawl 41 to be separated from the friction surface 301, the elastic member 43 is further compressed, the second pawl 42 is abutted with the friction surface 301, the second push block 13 is abutted with the bump 22 on the output member 21, the input member 11 is further rotated, the second push block 13 pushes the bump 22 to enable the output member 21 to rotate along with the input member 11, and at the moment, the second pawl 42 generates a friction force with the friction surface 301;
when the input member 11 is rotated in the opposite direction of the clockwise direction as shown in fig. 5, the input member 11 rotates relative to the output member 21, the second push block 13 on the input member 11 pushes the second pawl 42 to separate from the friction surface 301, the elastic member 43 is further compressed, the first pawl 41 abuts against the friction surface 301, the first push block 12 abuts against the bump 22 on the output member 21, the input member 11 is further rotated, the first push block 12 pushes the bump 22 to rotate the output member 21 along with the input member 11, and at this time, the first pawl 41 generates a friction force with the friction surface 301;
if the output member 21 is rotated clockwise as shown in fig. 5, the first pawl 41 abuts against the friction surface 301, so that the first pawl 41 cannot rotate relative to the housing 3, that is, the output member 21 itself cannot rotate, and the output member 21 and the input member 11 cannot rotate relative to each other; if the output member 21 is rotated in the reverse direction of the clockwise direction as shown in fig. 5, the second pawls 42 are in contact with the friction surfaces 301, so that the second pawls 42 cannot rotate relative to the housing 3, that is, the output member 21 itself cannot rotate, so that the output member 21 cannot rotate relative to the input member 11, that is, the power transmission from the output member 21 to the input member 11 cannot be achieved.
The housing 3, the input member 11 and the output member 21 of the embodiment are made of aluminum alloy materials, and the first pawls 41 and the second pawls 42 are made of metal materials such as steel, so that the rigidity of the first pawls 41 and the second pawls 42 is increased, the wear resistance is enhanced, and meanwhile, the one-way transmission structure is longer in service life and better in reliability. Of course, in other embodiments of the present invention, the housing 3, the input member 11, the output member 21, the first pawl 41 and the second pawl 42 may also be made of plastic, or other metal or non-metal materials, and the configuration is set according to actual requirements.
The one-way transmission structure of this embodiment's structure is comparatively simple, simple to operate, manufacturing cost are lower, the reliability is better, receive the influence of external vibrations less and life is longer.
The embodiment also provides a sun-shading device which comprises the one-way transmission structure.
The sunshade device provided by the embodiment has the unidirectional transmission structure, so that the reliability of the sunshade device is improved.
It is noted that reference throughout this specification to the description of "some embodiments," "other embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments are merely preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A one-way transmission structure, comprising:
the device comprises an input piece (11), wherein a first push block (12) and a second push block (13) which are distributed at intervals are arranged on the input piece (11), and the first push block (12) and the second push block (13) extend along the axial direction of the input piece (11);
an output member (21), the output member (21) being provided on the input member (11);
the shell (3) is sleeved on the input member (11) and the output member (21), and a friction surface (301) is arranged on the inner side wall of the shell (3);
a transmission assembly (4), the transmission assembly (4) comprising a first pawl (41), a second pawl (42) and an elastic member (43), one end of the elastic member (43) abuts against the first pawl (41) and the other end abuts against the second pawl (42), the extension directions of the first pawl (41) and the second pawl (42) are gradually arranged towards each other along the direction departing from the output member (21), and the first push block (12) to the second push block (13) along the first rotation direction of the input member (11), the first pawl (41) and the second pawl (42) are distributed on the input member (11) in sequence, in a natural state, the elastic member (43) is compressed, and both the first pawl (41) and the second pawl (42) can be abutted against the friction surface (301);
when the first pushing block (12) of the input member (11) pushes the first pawl (41) to disengage from the friction surface (301), the output member (21) and the transmission assembly (4) can rotate in the first rotation direction in which the second pawl (42) generates a friction force with the friction surface (301); when the second pushing block (13) of the input member (11) pushes the second pawl (42) to be separated from the friction surface (301), the output member (21) and the transmission assembly (4) can rotate along a second rotation direction of the first pawl (41) and the friction surface (301) to generate friction force;
when the output member (21) is driven to rotate along the first rotation direction, the first pawl (41) is abutted to the friction surface (301) so that the output member (21) is locked; when the output member (21) is rotationally driven in the second rotational direction, the second pawl (42) abuts against the frictional surface (301) to lock the output member (21).
2. A one-way transmission structure according to claim 1, wherein the output member (21) is provided with a projection (22) extending along a radial direction of the output member, the second push block (13) can abut against the projection (22) to push the output member (21) to rotate when the input member (11) rotates along the first rotation direction, and the first push block (12) can abut against the projection (22) to push the output member (21) to rotate when the input member (11) rotates along the second rotation direction.
3. The one-way transmission structure of claim 1, wherein a through hole is formed in the output member (21), the central axis of the through hole is perpendicular to the central axis of the output member (21), and the elastic member (43) penetrates through the through hole.
4. The structure of claim 1, wherein the elastic member (43) is any one of a compression spring, a torsion spring and a spring plate.
5. A one-way transmission according to claim 1, characterised in that the inside of the housing (3) is provided with a number of internal teeth, which are arranged circumferentially along the inside of the housing (3), the surfaces of which form the friction surfaces (301).
6. The one-way transmission structure according to claim 1, wherein the output member (21) is provided with a first mounting hole (2101), a second mounting hole (2102), a first avoidance groove (2103) communicated with the first mounting hole (2101), and a second avoidance groove (2104) communicated with the second mounting hole (2102), one end of the first pawl (41) is installed in the first mounting hole (2101), the other end extends in a direction of extending out of the first avoidance groove (2103), one end of the second pawl (42) is installed in the second mounting hole (2102), and the other end extends in a direction of extending out of the second avoidance groove (2104).
7. The structure of claim 6, wherein the first pawl (41) comprises a first rotating shaft (411) and a first pawl body (412) which are connected, the first rotating shaft (411) is rotatably mounted in the first mounting hole (2101), the second pawl (42) comprises a second rotating shaft (421) and a second pawl body (422) which are connected, and the second rotating shaft (421) is rotatably mounted in the second mounting hole (2102).
8. A unidirectional transmission structure according to claim 1, wherein a first connection hole (1101) is provided on the input member (11), a connection column (23) is provided on the output member (21), and the connection column (23) is clearance-fitted in the first connection hole (1101).
9. The structure of claim 1, wherein the output member (21) is provided with a second connecting hole (2105), the second connecting hole (2105) comprises a polygonal hole, and the second connecting hole (2105) is used for mounting an input shaft of a gear box.
10. A sun shading device comprising the one-way transmission structure according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010254371.8A CN111336193B (en) | 2020-04-02 | 2020-04-02 | Unidirectional transmission structure and sun-shading device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010254371.8A CN111336193B (en) | 2020-04-02 | 2020-04-02 | Unidirectional transmission structure and sun-shading device |
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| CN111336193B CN111336193B (en) | 2024-10-11 |
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| CN111336193B (en) | 2024-10-11 |
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