Four-bar linkage transmission structure and bicycle

Abstract

The utility model relates to the technical field of bicycles, and particularly discloses a four-connecting-rod transmission structure and a bicycle, the four-connecting-rod transmission structure realizes the flexibility of shock absorption through a four-connecting-rod structure consisting of a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, and the stability of the four-connecting-rod transmission structure is improved through a damping piece and a resetting piece; when the fourth connecting rod moves in one direction, the damping cylinder base rotates, viscous liquid in the oil groove flows from the first oil cavity to the second oil cavity through the oil hole and the third through hole, the flow speed is high, damping force is small, and therefore the fourth connecting rod can rapidly fall down to unload force; when the fourth connecting rod moves reversely under the action of the reset piece, the damping cylinder base rotates reversely, viscous liquid in the oil groove flows from the second oil cavity to the first oil cavity through the oil hole, the flow speed is low, damping force is large, and therefore the fourth connecting rod can be reset gently. According to the bicycle with the four-connecting-rod transmission structure, the riding experience of a user can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bicycle, especially the parts of bicycle. BACKGROUND

[0002] In order to improve the damping capacity, such devices as bicycles, electric bicycles and electric vehicles will be provided with spring damping structures at the front fork and rear wheel positions, the elastic force or damping force of the existing damping device is the same during compression and reset, which causes the bicycle to bounce up quickly and fall back quickly when running on a bumpy road, and the quick rising and falling mode cannot effectively unload the impact force generated by the road, so that the user's hands are subjected to a large impact force when riding, the bumping feeling is obvious, and the user experience is poor. SUMMARY

[0003] Therefore, the utility model provides a four-bar linkage transmission structure and bicycle for solving the technical problem of poor user experience caused by the same elastic force or damping force provided by the damping device in the prior art.

[0004] To achieve one or part or all of the above purposes or other purposes, the utility model provides a four-bar linkage transmission structure, comprising: a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a damping cylinder seat, a damping member and a reset member.

[0005] The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are sequentially hinged to form a four-bar linkage structure, the reset member is installed at any one hinged position of the four-bar linkage structure, and the first connecting rod is provided with a first connecting hole for hinging with the second connecting rod.

[0006] The damping cylinder seat is installed on the second connecting rod, an oil groove is arranged on the damping cylinder seat in the circumferential direction, the two ends of the oil groove are not communicated, the damping cylinder seat is arranged in the first connecting hole, and the inner wall of the first connecting hole seals the oil groove.

[0007] The damping member comprises a valve core and a baffle, the valve core is inserted into the oil groove from the outer wall of the first connecting rod, the valve core is connected with the first connecting rod, the valve core divides the oil groove into a first oil cavity and a second oil cavity, a first through hole, a second through hole and a third through hole are arranged on the valve core, the third through hole and the second through hole are distributed side by side and communicated, and the third through hole extends to the inner end wall of the first through hole in the axial direction.

[0008] An oil passing through hole for communicating the first through hole or the second through hole is arranged on the baffle, the baffle is arranged in the valve core, and the baffle has a first active position for plugging the first through hole and a second active position for plugging the second through hole.

[0009] When the baffle is in the first active position, the first oil cavity and the second oil cavity are communicated through the oil passing hole, the second through hole and the third through hole; when the baffle is in the second active position, the first oil cavity and the second oil cavity are communicated through the first through hole, the third through hole and the oil passing hole.

[0010] Preferably, further comprising an adjusting assembly, the adjusting assembly comprising a damping valve lock, the damping valve lock being inserted into the first oil cavity by the outer wall of the first connecting rod, and one end of the damping valve lock being connected with the first connecting rod, and the other end of the damping valve lock forming a flow-stopping part, the flow-stopping part being capable of being inserted into the first through hole, and the outer diameter of the flow-stopping part being smaller than the inner diameter of the first through hole.

[0011] Preferably, the flow-stopping part is a cone; the first through hole comprises a first stepped hole and a second stepped hole;

[0012] The second stepped hole is close to the second through hole, and the inner diameter of the second stepped hole is smaller than the inner diameter of the first stepped hole;

[0013] The maximum outer diameter of the cone is equal to or smaller than the inner diameter of the first stepped hole, and the outer diameter of the end of the damping valve lock inserted into the first oil cavity is between the inner diameter of the first stepped hole and the inner diameter of the second stepped hole.

[0014] Preferably, the adjusting assembly further comprises an adjusting cap, the outer wall of the first connecting rod is provided with a connecting boss, the connecting boss is provided with a threaded through hole which is threadedly connected with the damping valve lock, and the adjusting cap is rotatably installed on the connecting boss and fixedly connected with the damping valve lock, so that the damping valve lock is driven to reciprocate and the depth of the flow-stopping part inserted into the first through hole is controlled by rotating the adjusting cap.

[0015] Preferably, the adjusting assembly further comprises a locking knob, the outer wall of the connecting boss is provided with a first sealing groove and a limiting groove; the first sealing groove is provided with a first sealing ring, and the adjusting cap and the outer wall of the connecting boss are sealed by the first sealing ring; and the locking knob is inserted into the limiting groove after being detachably penetrated through the outer wall of the adjusting cap.

[0016] Preferably, the damping member further comprises a sealing cover;

[0017] The outer side wall of the first connecting rod is provided with a mounting hole;

[0018] The tail part of the valve core is provided with a second sealing groove, and the second sealing groove is provided with a second sealing ring; the head part of the valve core is placed in the oil groove through the mounting hole; the tail part of the valve core is sealed by the second sealing ring through the mounting hole, and is covered by the sealing cover.

[0019] Preferably, the second connecting rod comprises two symmetrically installed cover plates, the cover plates are provided with a first bearing seat and a second bearing seat which are spaced from each other, and the first bearing seat and the second bearing seat are both provided with bearings;

[0020] The first bearing seat is provided with a limiting key shaft, and the damping cylinder seat is provided with a first limiting hole for clamping the limiting key shaft;

[0021] The second bearing seat is connected with one end of the third connecting rod through a bearing.

[0022] Preferably, the outer wall of the damping cylinder seat is further provided with two third sealing grooves, which are symmetrically distributed on both sides of the oil groove, and a third sealing ring is arranged in each third sealing groove.

[0023] Preferably, the third connecting rod is provided with a connecting pipe, a plurality of bearings are arranged in the connecting pipe, one end of the fourth connecting rod is connected with the bearings, the other end of the fourth connecting rod is hingedly connected with the first connecting rod, the reset member is a torsion spring, the torsion spring is sleeved on the connecting pipe, one end of the torsion spring is clamped with the third connecting rod, and the other end of the torsion spring is clamped with the fourth connecting rod.

[0024] A bicycle comprises the four-bar linkage transmission structure, a frame and a front wheel.

[0025] The frame comprises a handlebar and a front fork connecting pipe connected with the handlebar, the first connecting rod extends to a connecting portion away from the first connecting hole, and the connecting portion is rotatably connected with the front fork connecting pipe.

[0026] The front wheel comprises a hub, a connecting key shaft, a transmission shaft and a locking rod, the hub is provided with an axially penetrating second limiting hole.

[0027] The third connecting rod is provided with an external connecting hole, the transmission rod is installed in the external connecting hole through a plurality of bearings, and the transmission shaft is provided with a transmission hole coaxially arranged.

[0028] The connecting key shaft is inserted into the second limiting hole of the hub, and the connecting key shaft is circumferentially fixed with the hub, the first end of the connecting key shaft is inserted into the transmission hole of the transmission shaft, and the connecting key shaft is circumferentially fixed with the transmission shaft.

[0029] The locking rod is screwed with the transmission shaft after penetrating through the connecting key shaft and the transmission hole, so as to limit the axial movement of the connecting key shaft.

[0030] The embodiment of the utility model has the following beneficial effects:

[0031] After the four-bar linkage transmission structure is adopted, the four-bar linkage transmission structure realizes flexibility of shock absorption through the four-bar linkage structure composed of the first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod, and improves stability of the structure through the damping member and the reset member; when the fourth connecting rod moves in one direction, the damping cylinder seat rotates, viscous liquid in the oil groove flows from the first oil cavity to the second oil cavity through the oil hole and the third through hole, the flow rate is relatively fast, the damping force is relatively small, so that the fourth connecting rod can quickly drop to unload force; when the fourth connecting rod moves reversely under the action of the reset member, the damping cylinder seat reversely rotates, the viscous liquid in the oil groove flows from the second oil cavity to the first oil cavity through the oil hole, the flow rate is relatively slow, the damping force is relatively large, so that the fourth connecting rod can be reset gently; the bicycle applying the four-bar linkage transmission structure has the advantages of quick drop shock absorption and gentle reset unloading, reduces bumping feeling of a user when riding the bicycle, and improves riding experience of the user. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Among them:

[0034] Figure 1 It is a whole structure schematic view of the four-bar linkage transmission structure in the present application;

[0035] Figure 2 It is an exploded view of the four-bar linkage transmission structure in the present application;

[0036] Figure 3 It is a partial sectional view of the four-bar linkage transmission structure in the present application;

[0037] Figure 4 It is an enlarged view of A part in Figure 3

[0038] Figure 5 It is a structure schematic view of the damping member in the present application;

[0039] Figure 6 It is a structure schematic view of the valve core in the present application;

[0040] Figure 7 It is a structure schematic view of the damping cylinder seat in the present application;

[0041] Figure 8 It is a partial structure schematic view of the first connecting rod in the present application;

[0042] ​Figure 9 It is the structure schematic view of the cover plate of the second connecting rod in the utility model;

[0043] Figure 10 It is the structure schematic view of the damping valve lock in the utility model;

[0044] Figure 11 It is the structure schematic view of the bicycle of the utility model for applying four connecting rod transmission structure;

[0045] Figure 12 It is the partial exploded view of the bicycle of the utility model for applying four connecting rod transmission structure;

[0046] Figure 13 It is the structure schematic view of the transmission shaft in the utility model. Figure 12

[0047] Figure 14 It is the structure schematic view of the transmission shaft in the utility model.

[0048] Reference signs:

[0049] 1 first connecting rod, 10 first connecting hole, 11 connecting boss, 110 limiting groove, 111 first sealing groove, 111a first sealing ring, 12 mounting hole, 13 connecting part,

[0050] 2 second connecting rod, 20 cover plate, 200 first bearing seat, 201 second bearing seat, 203 limiting key shaft,

[0051] 3 third connecting rod, 30 connecting pipe, 31 external connecting hole,

[0052] 4 fourth connecting rod,

[0053] 5 damping cylinder seat, 50 oil groove, 501 first oil cavity, 502 second oil cavity, 51 first limiting hole, 52 third sealing groove, 52a third sealing ring,

[0054] 6 damping piece, 60 valve core, 600 connecting cavity, 601 first through hole, 601a first stepped hole, 601b second stepped hole, 602 second through hole, 603 third through hole, 604 second sealing groove, 604a second sealing ring, 61 baffle, 610 oil passing hole, 62 sealing cover,

[0055] 7 reset piece,

[0056] 8 adjusting assembly, 80 damping valve lock, 800 intercepting part, 801 oil injection hole, 81 adjusting cap, 82 locking knob,

[0057] 9 frame, 90 front wheel, 900 hub, 900a second limiting hole, 901 connecting key shaft, 902 transmission shaft, 902a transmission hole, 903 locking rod, 91 handlebar, 92 front fork connecting pipe. ​DETAILED DESCRIPTION

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the present application is well suited to carry out the objects and advantages thereof and will be understood by practitioners of the art. The following detailed description is presented primarily for the purpose of enabling others to make and use the application.

[0059] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily referring to the same embodiment nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood that the embodiments described herein can be combined with one another.

[0060] For those skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely in conjunction with the drawings.

[0061] As shown in the accompanying Figures 1-14 The present application provides an embodiment.

[0062] The present application provides an embodiment.

[0063] The first connecting hole 10 is arranged on the first connecting hole 10, and the first connecting hole 10 is arranged on the first connecting hole 10.

[0064] The reset member 7 is installed at any one of the hinge joints of the four-bar linkage structure; the first connecting hole 10 is arranged on the first connecting hole 10.

[0065] The damping cylinder seat 5 is installed on the second connecting rod 2, and the damping cylinder seat 5 is provided with an oil groove 50 arranged along the circumference thereof; the two ends of the oil groove 50 are not communicated, and the damping cylinder seat 5 is arranged in the first connecting hole 10, and the inner wall of the first connecting hole 10 seals the oil groove 50.

[0066] The damping member 6 comprises a valve core 60 and a baffle 61; the valve core 60 is inserted into the oil groove 50 by the outer wall of the first connecting rod 1, and the valve core 60 is connected with the first connecting rod 1, the valve core 60 divides the oil groove 50 into a first oil cavity 501 and a second oil cavity 502, and the valve core 60 is provided with a first through hole 601, a second through hole 602 and a third through hole 603, the third through hole 603 is distributed side by side with the second through hole 602 and is communicated, and the third through hole 603 extends to the inner end wall of the first through hole 601 in the axial direction;

[0067] The baffle 61 is provided with an oil passing hole for communicating the first through hole 601 or the second through hole 602, the baffle 61 is arranged inside the valve core 60, and the baffle 61 has a first active position for plugging the first through hole 601 and a second active position for plugging the second through hole 602;

[0068] When the baffle 61 is located at the first active position, the first oil cavity 501 and the second oil cavity 502 are communicated through the oil passing hole 610, the second through hole 602 and the third through hole 603; when the baffle 61 is located at the second active position, the first oil cavity 501 and the second oil cavity 502 are communicated through the first through hole 601, the third through hole 603 and the oil passing hole 610.

[0069] In the embodiment, the first connecting rod 1 is hinged with one end of the second connecting rod 2 through the first connecting hole 10, the other end of the second connecting rod 2 is hinged with the third connecting rod 3, and the two ends of the fourth connecting rod 4 are hinged with the first connecting rod 1 and the third connecting rod 3 respectively, a four-connecting-rod transmission structure is formed by the first connecting rod 1, the second connecting rod 2, the third connecting rod 3 and the fourth connecting rod 4, a damping structure is formed by the damping cylinder seat 5 and the damping member 6 at the hinged position of the first connecting rod 1 and the second connecting rod 2, and the reset member 7 can be selected to be distributed at any hinged position of the four-connecting-rod transmission structure according to actual needs, and the embodiment is described by taking the hinged position of the third connecting rod 3 and the fourth connecting rod 4 as an example, in actual application, the third connecting rod 3 can be selected as a fixed rod, and the first connecting rod 1, the second connecting rod 2 and the fourth connecting rod 4 can be selected as swing rods, like Figure 3 When the fourth connecting rod 4 moves in the direction of the arrow, the forward damping force provided by the damping member 6 changes the speed of the fourth connecting rod 4 moving in this direction, and the reset member 7 provides the fourth connecting rod 4 with a force for returning movement, and the reverse damping force provided by the damping member 6 changes the speed of the fourth connecting rod 4 when resetting, when the four-connecting-rod transmission structure provided by the embodiment is applied to the front wheel 90 of a bicycle, the impact force generated by the front wheel 90 of the bicycle when subjected to external force collision is unloaded through the flexible swing of the four-connecting-rod transmission structure, and the shock absorption effect of the front wheel 90 of the bicycle is realized, the four-connecting-rod transmission structure has the advantages of flexible operation and rapid shock absorption, and by arranging the damping member 6 and the reset member 7 on the four-connecting-rod transmission structure, the shaking of the four-connecting-rod transmission structure is reduced, and the stability of the overall structure is improved, and the damping member 6 specifically provides different damping forces in the following ways:

[0070] When the valve core 60 moves in the oil groove 50, the viscous liquid therein flows clockwise or counterclockwise relative to the damping member 6. The viscous liquid has a large viscosity, and the flow time of the same volume of fluid is greatly affected by the cross-sectional area of the fluid when the movement distance is constant. Specifically, the flow of unit volume of viscous liquid from the first oil chamber 501 to the second oil chamber 502 takes a short time; conversely, the flow of unit volume of viscous liquid from the second oil chamber 502 to the first oil chamber 501 takes a long time. The cross-sectional area of the fluid can be controlled by the hole diameters of the first through hole 601, the second through hole 602, the third through hole 603, and the oil passage hole 610. Therefore:

[0071] The connecting cavity 600 is provided in the valve core 60 for sliding of the baffle 61, and the side of the connecting cavity 600 is open to facilitate insertion of the baffle 61 into the connecting cavity 600. The first through hole 601 and the second through hole 602 are respectively arranged on the opposite two side walls of the connecting cavity 600, the third through hole 603 is arranged side by side with the second through hole 602, and extends through the bottom wall of the connecting cavity 600 to the side wall provided with the first through hole 601 in the axial direction, that is, the third through hole 603 is arranged non-axially with the first through hole 601. In this embodiment, the hole diameters of the first through hole 601, the second through hole 602, and the third through hole 603 are all greater than the hole diameter of the oil passage hole 610. Based on this, when the viscous liquid flows from the second oil chamber 502 to the first oil chamber 501, the flowing viscous liquid drives the baffle 61 to slide to the first active position. At this time, the baffle 61 blocks the first through hole 601, and the fluid cross-sectional area of the viscous liquid from the second oil chamber 502 to the first oil chamber 501 is the area of the oil passage hole 610. Therefore, the flow speed of the viscous liquid from the second oil chamber 502 to the first oil chamber 501 is slow, and the flow time required is longer, that is, the damping force is larger. Conversely, when the viscous liquid flows from the first oil chamber 501 to the second oil chamber 502, the flowing viscous liquid drives the baffle 61 to slide to the second active position. At this time, the baffle 61 blocks the second through hole 602, and the viscous liquid first passes through the first through hole 601, and then passes through the third through hole 603 and the oil passage hole 610 to enter the second oil chamber 502. That is, the fluid cross-sectional area of the viscous liquid from the first oil chamber 501 to the second oil chamber 502 is the sum of the areas of the oil passage hole 610 and the third through hole 603. Therefore, the flow speed of the viscous liquid from the first oil chamber 501 to the second oil chamber 502 is fast, and the flow time required is shorter, that is, the damping force is smaller.

[0072] As shown in FIGS. 1 to 3, Figure 3 , FIGS. 4 to 6, Figure 4 and FIGS. 7 to 9, Figure 11As shown, taking the application of this four-bar linkage structure to the front fork of a bicycle front wheel 90 as an example, the third link 3 serves as a fixed link to connect the hub 900 of the front wheel 90. When the front wheel 90 is hit by an impact, the first link 1 will move along the path shown in the attached diagram. Figure 3 Moving in the direction of the arrow, the damping cylinder seat 5 rotates counterclockwise relative to the valve core 60. The viscous liquid in the oil groove 50 flows from the first oil chamber 501 to the second oil chamber 502. At this time, the baffle 61 slides to the second active position, where the fluid cross-sectional area is larger, allowing the viscous liquid to flow into the second oil chamber 502 at a faster flow rate, taking less time and with less damping force. This means the first connecting rod 1 can quickly fall in the direction of the arrow to relieve force. After the impact, under the action of the reset piece 7 installed on the third connecting rod 3 and the fourth connecting rod 4, the first connecting rod 1 resets in the opposite direction of the arrow. The damping cylinder seat 5 rotates clockwise relative to the valve core 60. At this time, the baffle 61 slides to the first active position, where the fluid cross-sectional area is smaller, allowing the viscous liquid to inject into the first oil chamber 501 at a slower flow rate, taking longer and with greater damping force. This means the first connecting rod 1 resets in a gentler manner, avoiding a large impact on the user's palm from rapid reset and improving the user's riding experience.

[0073] In summary, this four-bar linkage structure achieves shock absorption flexibility through the four-bar structure consisting of the first link 1, the second link 2, the third link 3, and the fourth link 4, and further improves the stability of the structure through the damping element 6 and the reset element 7. When the fourth link 4 moves in one direction, the damping cylinder seat 5 rotates, and the viscous liquid in the oil groove 50 flows from the first oil chamber 501 to the second oil chamber 502 through the oil hole 610 and the third through hole 603. The flow rate is relatively fast and the damping force is small, allowing the fourth link 4 to fall quickly to relieve the force. When the fourth link 4 moves in the opposite direction under the action of the reset element 7, the damping cylinder seat 5 rotates in the opposite direction, and the viscous liquid in the right groove flows from the second oil chamber 502 to the first oil chamber 501 through the oil hole 610. The flow rate is relatively slow and the damping force is large, allowing the fourth link 4 to reset smoothly.

[0074] See appendix Figure 2 Appendix Figure 4 and attached Figure 10The four-bar linkage transmission structure further comprises an adjusting assembly 8, the adjusting assembly 8 comprising a damping valve lock 80, the damping valve lock 80 being inserted into the first oil cavity 501 by an outer wall of the first connecting rod 1, and one end of the damping valve lock 80 being connected with the first connecting rod 1, and the other end of the damping valve lock 80 forming a flow-stopping part 800, the flow-stopping part 800 being capable of being inserted into the first through hole 601, and the outer diameter of the flow-stopping part 800 being smaller than the inner diameter of the first through hole 601. Specifically, the flow-stopping part 800 is a conical body; the first through hole 601 comprises a first stepped hole 601a and a second stepped hole 601b; the second stepped hole 601b is close to the second through hole 602, and the inner diameter of the second stepped hole 601b is smaller than the inner diameter of the first stepped hole 601a; the maximum outer diameter of the conical body is equal to or smaller than the inner diameter of the first stepped hole 601a, and the outer diameter of the end of the damping valve lock 80 inserted into the first oil cavity 501 is between the inner diameter of the first stepped hole 601a and the inner diameter of the second stepped hole 601b. The connection between the damping valve lock 80 and the first connecting rod 1 is an adjustable connection, by adjusting the position of the damping valve lock 80 on the first connecting rod 1, the depth of the flow-stopping part 800 inserted into the first through hole 601 is changed, and the effective fluid cross-sectional area of the first through hole 601 and the oil passing hole 610 is controlled. Specifically, when the end wall of the damping valve lock 80 provided with the flow-stopping part 800 abuts against the bottom wall of the first stepped hole 601a, the flow-stopping part 800 completely blocks the second stepped hole 601b, i.e. the viscous liquid cannot flow between the first oil cavity 501 and the second oil cavity 502, at this time, the four-bar linkage transmission structure does not have damping effect, and the user can select this mode according to actual needs. Correspondingly, when the flow-stopping part 800 is inserted into the second stepped hole 601b, and the baffle 61 is in the first active position, the tip of the flow-stopping part 800 is inserted into the oil passing hole 610 of the baffle 61, at this time, the fluid cross-sectional area is further reduced, the speed of the viscous liquid flowing from the second oil cavity 502 to the first oil cavity 501 is slower, and the damping force is greater, and the damping force of the four-bar linkage transmission structure can be adjusted according to the depth of the flow-stopping part 800 inserted into the second stepped hole 601b.

[0075] In order to facilitate the user to adjust the damping valve lock 80, control the depth of the intercepting part 800 in the first through hole 601, and further change the damping force of the four-bar linkage transmission structure, the adjusting assembly 8 further comprises an adjusting cap 81. The outer wall of the first connecting rod 1 is provided with a connecting boss 11. The connecting boss 11 is provided with a threaded through hole which is threadedly connected with the damping valve lock 80. The adjusting cap 81 is rotatably installed on the connecting boss 11, and the adjusting cap 81 is fixedly connected with the damping valve lock 80. The damping valve lock 80 is driven to reciprocate by rotating the adjusting cap 81, so as to control the depth of the intercepting part 800 inserted into the first through hole 601. Specifically, the damping valve lock 80 is provided with external threads which are connected with the threaded through hole, and the center position of the damping valve lock 80 is provided with a hexagonal special-shaped hole. The inside of the adjusting cap 81 is correspondingly provided with a hexagonal special-shaped column. The special-shaped column is inserted into the special-shaped hole of the damping valve lock 80, so that the adjusting cap 81 and the damping valve lock 80 are circumferentially fixed, so as to rotate the adjusting cap 81 to drive the damping valve lock 80 to rotate. The top of the adjusting cap 81 is further provided with an adjusting mark, so as to provide an adjusting reference for the user.

[0076] In order to further improve the stability and sealing performance of the four-bar linkage transmission structure, the adjusting assembly 8 further comprises a locking knob 82. The outer wall of the connecting boss 11 is provided with a first sealing groove 111 and a limiting groove 110. The first sealing groove 111 is provided with a first sealing ring 111a. The outer wall of the connecting boss 11 and the adjusting cap 81 are sealed by the first sealing ring 111a. The locking knob 82 is detachably inserted into the limiting groove 110 after penetrating through the outer wall of the adjusting cap 81. Specifically, the limiting groove 110 is an annular groove, so that the locking knob 82 can be quickly inserted into the limiting groove 110 to axially limit the adjusting cap 81, so as to avoid the adjusting cap 81 from being separated from the connecting boss 11. Meanwhile, the axial limitation of the damping valve lock 80 is further reinforced, so that the depth of the intercepting part 800 in the first through hole 601 is not easily changed, and the damping force which has been adjusted can be maintained for a long time. The first sealing ring 111a on the outer wall of the connecting boss 11 and the inner wall of the adjusting cap 81 are sealed, so that the viscous liquid in the oil groove 50 cannot leak through the gap between the damping valve lock 80 and the connecting boss 11, and the sealing effect of the oil groove 50 is effectively improved.

[0077] It should be further noted that the damping lock 80 is further provided with an axially extending oil injection hole 801. One end of the oil injection hole 801 is communicated with the special-shaped hole and is blocked by the special-shaped column on the adjusting cap 81. The other end of the oil injection hole 801 is provided in the side wall of the intercepting part 800 and is used to communicate with the oil groove 50. When it is necessary to supplement the viscous liquid in the oil groove 50, the adjusting cap 81 is removed, and the viscous liquid is supplemented into the oil groove 50 through the oil injection hole 801.

[0078] Referring to the drawings Figure 4 and the drawings Figure 8, the damping member 6 further comprises a sealing cover 62; the outer wall of the first connecting rod 1 is provided with a mounting hole 12; the tail of the valve core 60 is provided with a second sealing groove 604, and a second sealing ring 604a is arranged in the second sealing groove 604; the head of the valve core 60 is arranged in the oil groove 50 through the mounting hole 12; the tail of the valve core 60 is sealed with the second sealing ring 604a through the mounting hole 12, and is covered by the sealing cover 62; in the embodiment, the head of the valve core 60 is a square column structure, the tail of the valve core 60 is a cylindrical structure, the mounting hole 12 is correspondingly provided with a stepped square hole and a circular hole, the square head of the valve core 60 can avoid the valve core 60 rotating circumferentially on the mounting hole 12, and ensure that the first through hole 601 is always connected with the first oil cavity 501, the second through hole 602 and the third through hole 603 are always connected with the second oil cavity 502, the circular tail of the valve core 60 facilitates installation of the second sealing ring 604a, improves the sealing between the valve core 60 and the mounting hole 12, and ensures that the four connecting rod transmission structure does not leak oil during use; two threaded holes can be further arranged on the outer wall of the first connecting rod 1, and two through holes are correspondingly arranged on the sealing cover 62; after the sealing cover 62 covers the mounting hole 12, the sealing cover 62 and the outer wall of the first connecting rod 1 are fixedly connected through the screw and the threaded hole, so that the structural stability is improved; in addition, one side of the valve core 60 in contact with the bottom wall of the oil groove 50 is provided with an arc surface with the same curvature as the bottom wall of the oil groove 50, so that the damping cylinder seat 5 can rotate relative to the valve core 60, and the two arc surfaces can avoid the first oil cavity 501 and the second oil cavity 502 from flowing through the gap, so that the damping effect of the multiple through holes in the valve core 60 is not disturbed.

[0079] Referring to the drawings Figure 2 and the drawings Figure 9 , the second connecting rod 2 comprises two symmetrically arranged cover plates 20, the cover plates 20 are provided with a first bearing seat 200 and a second bearing seat 201 which are spaced from each other, and the first bearing seat 200 and the second bearing seat 201 are both provided with bearings; the first bearing seat 200 is provided with a limiting key shaft 203, and the damping cylinder seat 5 is provided with a first limiting hole 51 which is connected with the limiting key shaft 203; the second bearing seat 201 is connected with one end of the third connecting rod 3 through the bearing.

[0080] Specifically, in order to facilitate the assembly of the second connecting rod 2 and the first connecting rod 1, the second connecting rod 2 of the embodiment is composed of two mutually buckled cover plates 20. After assembling the bearing on the corresponding bearing seat of the cover plate 20, the two cover plates 20 with limiting key shafts 203 are inserted from both ends of the first connecting hole 10, so that the limiting key shafts 203 are inserted into the limiting holes of the damping cylinder seat 5, and finally fixed by locking screws. The cross sections of the limiting key shafts 203 and the first limiting holes 51 of the embodiment are quadrilaterals, and the circumferential fixation between the limiting key shafts 203 and the damping cylinder seat 5 is achieved by the way of different-shaped clamping, so that the damping cylinder seat 5 can rotate with the limiting key shafts 203. In other embodiments, the cross sections of the limiting key shafts 203 and the first limiting holes 51 can also be selected as D-shaped, hexagonal and other special shapes.

[0081] In order to further improve the sealing effect of the oil groove 50, the outer wall of the damping cylinder seat 5 is also provided with two third sealing grooves 52, which are symmetrically distributed on both sides of the oil groove 50. The third sealing groove 52 is provided with a third sealing ring 52a, and the outer wall of the damping cylinder seat 5 and the inner wall of the first connecting hole 10 are sealed by the third sealing ring 52a. By providing two third sealing rings 52a on the damping cylinder seat 5, the leakage of viscous liquid in the oil groove 50 through the gap between the damping cylinder seat 5 and the inner wall of the first connecting hole 10 is avoided.

[0082] Referring to the accompanying drawings Figure 2 and the accompanying drawings Figure 3 The third connecting rod 3 is provided with a connecting pipe 30, a plurality of bearings are arranged in the connecting pipe 30, and one end of the fourth connecting rod 4 is connected with the fourth connecting rod 4. The other end of the fourth connecting rod 4 is hinged with the first connecting rod 1. The reset member 7 is a torsion spring, the torsion spring is sleeved on the connecting pipe 30, one end of the torsion spring is clamped with the third connecting rod 3, and the other end of the torsion spring is clamped with the fourth connecting rod 4. Specifically, the fourth connecting rod 4 in the embodiment is composed in the same way as the cover plate 20 of the second connecting rod 2, so as to facilitate the connection of the two ends of the fourth connecting rod 4 with the first connecting rod 1 and the third connecting rod 3. Specifically, a through hole is arranged at a position away from the first connecting hole 10 of the first connecting rod 1, and the through hole is hinged with the fourth connecting rod 4 through a bearing. A connecting pipe 30 is arranged at an end of the third connecting rod 3 away from the second connecting rod 2, and the end of the fourth connecting rod 4 is hinged with the connecting pipe 30 through a bearing. In the embodiment, the reset member 7 is preferably a torsion spring, the torsion spring is sleeved on the connecting pipe 30, and both ends of the torsion spring are formed in a barb shape. The third connecting rod 3 and the fourth connecting rod 4 are both provided with stepped structures for clamping the barbs of the torsion spring.

[0083] Referring to the accompanying drawings Figure 11 to the accompanying drawings Figure 14The embodiment also provides a bicycle comprising the four-bar linkage transmission structure, a frame 9 and a front wheel 90; the frame 9 comprises a handlebar 91 and a front fork connecting pipe 92 connected to the handlebar 91; the first connecting hole 10 is extended to the connecting part 13; and the connecting part 13 is rotatably connected to the front fork connecting pipe 92.

[0084] The front wheel 90 comprises a hub 900, a connecting key shaft 901, a transmission shaft 902 and a locking rod 903; the hub 900 is provided with an axially-through second limiting hole 900a;

[0085] The third connecting rod 3 is provided with an external connecting hole 31; the transmission rod is installed in the external connecting hole 31 through a plurality of bearings; and the transmission shaft 902 is provided with a transmission hole 902a coaxially arranged;

[0086] The connecting key shaft 901 is inserted into the second limiting hole 900a of the hub 900; the connecting key shaft 901 is circumferentially fixed to the hub 900; the first end of the connecting key shaft 901 is inserted into the transmission hole 902a of the transmission shaft 902; and the connecting key shaft 901 is circumferentially fixed to the transmission shaft 902.

[0087] The locking rod 903 is screwed to the transmission shaft 902 after penetrating through the connecting key shaft 901 and the transmission hole 902a, so as to limit the axial movement of the connecting key shaft 901.

[0088] In the embodiment, the first connecting rod 1 is used as the front fork connected to the handlebar 91; specifically, the first connecting rod 1 is extended to form the connecting part 13; the connecting part 13 is rotatably connected to the front fork connecting pipe 92, that is, the connecting part 13 can be circumferentially rotated relative to the front fork connecting pipe 92, so as to facilitate the user to control the advancing direction of the front wheel 90 by controlling the handlebar 91; the third connecting rod 3 is used as the fixing rod; and the hub 900 of the front wheel 90 is connected to the external connecting hole 31 of the third connecting rod 3; specifically, the transmission rod with two bearings is installed on the external connecting hole 31; the hub 900 is connected to the transmission rod through the connecting key shaft 901; and the front wheel 90 can be rotated relative to the third connecting rod 3; in the embodiment, the cross sections of the connecting key shaft 901, the second limiting hole 900a and the transmission hole 902a are hexagonal, so as to improve the torque of the connecting key shaft 901 while achieving the circumferential fixation; the connecting relationship between the third connecting rod 3 and the front wheel 90 is hidden in the external connecting hole 31 and the hub 900 through the form of the connecting key shaft 901 and the transmission rod, so that the structure of the front wheel 90 of the bicycle is compact and the appearance is neat; and the transmission is fully sealed; the bicycle with the four-bar linkage transmission structure has the advantages of rapid falling shock absorption and gentle reset unloading, so as to reduce the bumping feeling of the user when riding the bicycle and improve the riding experience of the user.

[0089] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A four-bar linkage drive structure, characterized by, The application relates to a damping device for a four-bar linkage mechanism. The damping device comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a damping cylinder base, a damping part and a reset part. The first connecting rod, the second connecting rod, the third connecting rod and the fourth connecting rod are sequentially hinged to form a four-bar linkage structure; the reset part is installed at any hinged position of the four-bar linkage structure; the first connecting rod is provided with a first connecting hole for being hinged to the second connecting rod. The damping cylinder base is installed on the second connecting rod, the damping cylinder base is provided with an oil groove arranged along the circumference of the damping cylinder base, the two ends of the oil groove are not communicated, the damping cylinder base is arranged in the first connecting hole, and the inner wall of the first connecting hole seals the oil groove. The damping part comprises a valve core and a baffle; the valve core is inserted into the oil groove from the outer wall of the first connecting rod, the valve core is connected to the first connecting rod, the valve core divides the oil groove into a first oil cavity and a second oil cavity, the valve core is provided with a first through hole, a second through hole and a third through hole, the third through hole is distributed in parallel with the second through hole and is communicated with the second through hole, and the third through hole extends to the inner end wall of the first through hole along the axial direction. The baffle is provided with an oil passing hole for communicating the first through hole or the second through hole, the baffle is arranged in the valve core, and the baffle has a first active position for plugging the first through hole and a second active position for plugging the second through hole. When the baffle is located at the first active position, the first oil cavity and the second oil cavity are communicated through the oil passing hole, the second through hole and the third through hole; when the baffle is located at the second active position, the first oil cavity and the second oil cavity are communicated through the first through hole, the third through hole and the oil passing hole.

2. The four-bar linkage drive structure according to claim 1, characterized in that The damping device further comprises an adjusting assembly, the adjusting assembly comprises a damping valve lock, the damping valve lock is inserted into the first oil cavity from the outer wall of the first connecting rod, one end of the damping valve lock is connected to the first connecting rod, the other end of the damping valve lock forms a flow-stopping part, the flow-stopping part can be inserted into the first through hole, and the outer diameter of the flow-stopping part is smaller than the inner diameter of the first through hole.

3. The four-bar linkage drive structure according to claim 2, characterized in that The flow-stopping part is a conical body; the first through hole comprises a first stepped hole and a second stepped hole; The second stepped hole is close to the second through hole, and the inner diameter of the second stepped hole is smaller than the inner diameter of the first stepped hole; The maximum outer diameter of the conical body is equal to or smaller than the inner diameter of the first stepped hole, the outer diameter of the end of the damping valve lock inserted into the first oil cavity is between the inner diameter of the first stepped hole and the inner diameter of the second stepped hole.

4. The four-bar linkage drive structure according to claim 3, characterized in that The adjusting assembly further comprises an adjusting cap, the outer wall of the first connecting rod is provided with a connecting boss, the connecting boss is provided with a threaded through hole which is threadedly connected to the damping valve lock, the adjusting cap is rotatably arranged on the connecting boss, the adjusting cap is fixedly connected to the damping valve lock, the damping valve lock is driven to reciprocate by rotating the adjusting cap, and the depth of the flow-stopping part inserted into the first through hole is controlled.

5. The four-bar linkage drive structure according to claim 3, wherein The adjusting assembly further comprises a locking knob, the outer wall of the connecting boss is provided with a first sealing groove and a limiting groove; the first sealing groove is provided with a first sealing ring, the outer wall of the connecting boss and the adjusting cap are sealed by the first sealing ring; the locking knob is inserted into the limiting groove after being detachably penetrated through the outer wall of the adjusting cap.

6. The four-bar linkage drive structure of claim 1, wherein The damping part further comprises a sealing cover; The outer side wall of the first connecting rod is provided with a mounting hole. The tail of the valve core is provided with a second sealing groove, and a second sealing ring is arranged in the second sealing groove.

7. The four-bar linkage drive structure according to claim 6, wherein The second connecting rod comprises two symmetrically arranged cover plates, which are provided with a first bearing seat and a second bearing seat spaced from each other, and the first bearing seat and the second bearing seat are both provided with bearings; The first bearing seat is provided with a limiting key shaft, and the damping cylinder seat is provided with a first limiting hole for clamping the limiting key shaft; The second bearing seat is connected with one end of the third connecting rod through the bearing thereof.

8. The four-bar linkage drive structure according to claim 7, wherein The outer wall of the damping cylinder seat is further provided with two third sealing grooves, which are symmetrically arranged on both sides of the oil groove, and a third sealing ring is arranged in each third sealing groove.

9. The four-bar linkage drive structure of claim 1, wherein, The third connecting rod is provided with a connecting pipe, a plurality of bearings are arranged in the connecting pipe, and one end of the fourth connecting rod is connected with the fourth connecting rod, and the other end of the fourth connecting rod is hingedly connected with the first connecting rod.

10. Bicycle comprising a four-bar linkage transmission according to any one of claims 1-9, characterized in that, The vehicle further comprises a frame and a front wheel. The frame comprises a handlebar and a front fork connecting pipe connected to the handlebar, the first connecting rod extends in a direction away from the first connecting hole to form a connecting portion, and the connecting portion is rotatably connected to the front fork; The front wheel comprises a hub, a connecting key shaft, a transmission shaft and a locking rod, and the hub is provided with an axially penetrating second limiting hole; The third connecting rod is provided with an external connecting hole, the transmission shaft is mounted in the external connecting hole through a plurality of bearings, and the transmission shaft is provided with a transmission hole coaxially arranged thereon; The connecting key shaft is inserted into the second limiting hole of the hub, and the connecting key shaft and the hub are circumferentially fixed, the first end of the connecting key shaft is inserted into the transmission hole of the transmission shaft, and the connecting key shaft and the transmission shaft are circumferentially fixed; The locking rod penetrates through the connecting key shaft and the transmission hole and is threadedly connected with the transmission shaft to limit the axial movement of the connecting key shaft.

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