A front drive shock absorber for a tricycle

Abstract

The application relates to the field of shock absorbers, and discloses a front-drive shock absorber for a tricycle, which comprises a fixed mounting frame, the inside of a sliding sleeve is provided with a synchronous transmission mechanism, and the synchronous transmission mechanism is used for improving the damping effect of the front wheel of the tricycle. When a cylinder barrel slides on the surface of a piston rod, a fixed push rod is driven to slide in the inside of a rectangular groove. When the tricycle continuously travels on a section of a road with large bumps, the side cylinder barrel is subjected to a large impact force, then drives the cylinder barrel on the other side to synchronously move, causes the pair of cylinder barrels to be subjected to a large impact, and simultaneously causes the situation of bottom contact, and the situation of damage occurs for a long time, and then causes the damping effect to be weakened. When the tricycle travels on a section of a road with small bumps, the fixed push rod can drive a movable stopper and a synchronous transmission rod to synchronously move, can cause the pair of cylinder barrels to synchronously move, fully avoids the situation that a single-side cylinder barrel is subjected to continuous impact, also causes the situation of weakening of the damping effect to occur, and can fully improve the damping effect of the shock absorber assembly.

Description

Technical Field

[0001] This invention relates to the field of shock absorber technology, specifically a front-wheel drive shock absorber for a three-wheeled vehicle. Background Technology

[0002] Front-wheel drive shock absorbers for tricycles, also known as tricycle front forks, are mainly used for shock absorption during tricycle operation. They prevent the front wheel from bouncing up and the driver's arms from going numb on bumpy roads, effectively improving the driver's handling and safety. However, existing technology still has the following drawbacks: When a tricycle is traveling on a bumpy road and is eccentrically loaded, the front wheel will be continuously impacted on one side, causing the shock absorber on that side to be continuously impacted. Over time, this will damage the shock absorber on that side and weaken the shock absorption effect of the front-wheel drive shock absorber. To avoid this situation, existing technology uses a synchronous linkage to connect the shock absorbers on both sides. When one side of the shock absorber is impacted by bumps, the synchronous linkage will transfer the impact generated on the impacted side to the other side of the shock absorber that is not directly impacted, thus distributing the impact force generated by traveling on bumpy roads and preventing the shock absorber on one side from being continuously impacted. However, while connecting the two shock absorbers together with a synchronizing rod can effectively improve the shock absorption effect of the tricycle when driving on bumpy roads, when driving on continuously bumpy roads, the synchronizing rod will force the other shock absorber to passively compress after one side of the wheel continuously bears the impact of the road. At this time, the other shock absorber will continuously generate ineffective reciprocating motion, resulting in both shock absorbers bearing alternating impact loads simultaneously. When the impact force increases instantaneously, both shock absorbers will approach their limit compression stroke simultaneously, which can easily lead to both shock absorbers hitting the bottom at the same time. This will aggravate the fatigue wear of the internal damping and sealing components of the shock absorber. Long-term driving will cause the shock absorption performance to deteriorate rapidly. Moreover, if the vehicle is under eccentric load conditions, the rigid connecting rod forces both shock absorbers to maintain the same compression stroke, and cannot adaptively adjust the compression amount according to the actual load on both sides, which will further weaken the shock absorption effect. In view of this, the present invention provides a front-wheel drive shock absorber for a three-wheeled vehicle. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a front-wheel drive shock absorber for tricycles. It solves the problem that in existing technologies, when shock absorbers on both sides of the wheel are connected by a synchronous linkage to distribute the impact load, if the vehicle is on a continuously bumpy road and is only loaded on one side, the side not subjected to alternating impact load will move ineffectively, ultimately weakening the shock absorption performance on both sides.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A front-wheel drive shock absorber for a tricycle includes a fixed mounting bracket, a pair of piston rods fixed below the fixed mounting bracket, a cylinder slidably sleeved on the outer side of the piston rods, a sliding sleeve housing above the cylinder housing, and a synchronous transmission mechanism inside the sliding sleeve housing for improving the shock absorption effect of the front wheel of the tricycle. The synchronous transmission mechanism includes a synchronous transmission rod. A fixed push rod is fixed to one side of the piston rod and can move up and down. A movable stop is provided on one side of the fixed push rod. The up and down movement of the cylinder can drive the fixed push rod to move inside the synchronous transmission rod, thereby driving the synchronous transmission rod to move upward synchronously, so that a pair of cylinders slide synchronously on the outside of the piston rod.

[0005] Preferably, a cleaning ring is detachably connected inside the sliding sleeve for cleaning mud and dust on the piston rod surface, and a collection groove is provided on the outer side above the cleaning ring for collecting the scraped mud and sand.

[0006] Preferably, the synchronous transmission mechanism further includes a limiting slide rod fixedly connected to one side of the movable stop. A compression spring is provided at the connection between the limiting slide rod and the movable stop. The synchronous transmission rod has a sliding groove inside for the limiting slide rod to slide. After the limiting slide rod slides to its limit position inside the sliding groove, the movable stop no longer limits the movement of the fixed push rod, ensuring that a pair of cylinders can slide and absorb shock independently on the piston rod surface.

[0007] Preferably, a top spring is provided at one end of the limiting slide rod near the middle, the top spring is located inside the synchronous transmission rod, and the lower part of the movable stop and the contact part of the fixed push rod are both arc-shaped.

[0008] Preferably, a limit strip is provided at the contact point between the fixed push rod and the movable stop, and a limit groove is provided at the contact point between the movable stop and the limit strip. When the fixed push rod drives the limit strip to move upward, the limit strip will slide inside the limit groove.

[0009] Preferably, rectangular slots are provided on both sides of the synchronous transmission rod, and the fixed push rod slides inside the rectangular slots. The width of the limiting strip is smaller than the width of the limiting slot below the movable stop.

[0010] Preferably, in the initial state, both of the fixed push rods are in contact with the lower inner side of the rectangular groove. The width of the fixed push rod is the same as the width of the rectangular groove. The pair of fixed push rods are horizontally symmetrical when traveling on small bumpy road sections, and vertically staggered when traveling on continuously bumpy road sections.

[0011] Preferably, the upper part of the limiting slide rod is tapered, and the sliding groove inside the synchronous transmission rod has the same shape as the limiting slide rod, but the tapered part above the limiting slide rod retains a space for movement, and protective sleeves are provided at both ends of the synchronous transmission rod near the cylinder.

[0012] Preferably, a reinforcing plate is detachably connected to the lower part of the cylinder to enhance the stability between it and the front tire of the tricycle, and a dust cover is provided at the upper part of the cylinder where it slides in contact with the piston rod to isolate mud and dust.

[0013] Preferably, a nylon sleeve is provided inside the cylinder for sliding engagement with the piston rod and reducing sliding friction wear. An oil seal is also provided above the nylon sleeve to seal the internal space of the cylinder and prevent hydraulic oil from leaking out. The oil seal and the nylon sleeve are coaxially arranged inside the cylinder to protect the hydraulic oil inside the cylinder and prevent hydraulic oil leakage and external impurities from entering the cylinder. A protective sleeve is also provided inside the cylinder.

[0014] This invention provides a front-wheel drive shock absorber for a three-wheeled vehicle. It has the following beneficial effects: 1. This invention, by having the cylinder slide on the piston rod surface, drives the fixed push rod to slide inside the rectangular groove. This avoids the situation where, when a tricycle travels on a continuously bumpy road, the cylinder on one side experiences a large impact force, causing the cylinder on the other side to move synchronously, resulting in both cylinders being subjected to large impacts and bottoming out simultaneously. Over time, this can lead to damage and weaken the shock absorption effect. However, when traveling on a less bumpy road, the fixed push rod can drive the movable stop block and the synchronous transmission rod to move synchronously, allowing both cylinders to move synchronously. This effectively avoids the situation where one cylinder is subjected to continuous impact, which would also weaken the shock absorption effect, thus significantly improving the shock absorption effect of the shock absorber assembly.

[0015] 2. This invention uses the upward movement of the synchronous transmission rod to drive the cleaning ring inside the sliding sleeve to clean the mud and dust adhering to the piston rod surface. Combined with the dust cover installed above the cylinder, this effectively improves the stability of the sliding contact between the cylinder and the piston rod, preventing jamming of the cylinder when sliding on the piston rod surface due to impurities. Furthermore, by installing a reinforcing plate below the cylinder to enhance tire installation stability, it ensures the stability of the impact force transmitted to the cylinder during driving on both small and continuous bumpy roads after tire installation. This allows the synchronous transmission mechanism to accurately sense changes in the cylinder's stress, thereby fully guaranteeing the shock absorption performance of the tricycle when driving on both small and continuous bumpy roads. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2This is a schematic diagram of the internal structure of the sliding sleeve of the present invention; Figure 3 This is an assembly diagram of the cleaning ring and piston rod of the present invention; Figure 4 This is a schematic diagram of the synchronous transmission mechanism of the present invention; Figure 5 This is a diagram showing the motion state of the fixed push rod moving upward and the movable stop moving inward according to the present invention. Figure 6 For the present invention Figure 4 Side view schematic diagram; Figure 7 This is a schematic diagram of the limiting strip and limiting groove of the present invention; Figure 8 This is an assembly drawing of the limiting strip and limiting groove of the present invention; Figure 9 For the present invention Figure 4 A magnified view of a section at point A in the middle; Figure 10 This is a schematic diagram of the internal structure of the cylinder of the present invention; Figure 11 This is an exploded view of the internal structure of the cylinder of the present invention.

[0017] The components include: 1. Fixed mounting bracket; 2. Piston rod; 3. Sliding sleeve; 4. Cylinder; 5. Reinforcing plate; 6. Synchronous transmission mechanism; 601. Synchronous transmission rod; 602. Fixed push rod; 603. Movable stop block; 604. Compression spring; 605. Limiting slide rod; 606. Top spring; 607. Sliding groove; 608. Rectangular groove; 609. Limiting strip; 610. Limiting groove; 7. Cleaning ring; 8. Protective sleeve; 9. Protective cylinder; 10. Oil seal; 11. Nylon sleeve; 12. Dust cover. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] Please see Figures 1 to 6 As shown, the present invention provides a front-wheel drive shock absorber for a tricycle, including a fixed mounting bracket 1, a pair of piston rods 2 fixed below the fixed mounting bracket 1, a cylinder 4 slidably sleeved on the outer side of the piston rods 2, a sliding sleeve 3 disposed above the cylinder 4, and a synchronous transmission mechanism 6 disposed inside the sliding sleeve 3, for improving the shock absorption effect of the front wheel of the tricycle. The synchronous transmission mechanism 6 includes a synchronous transmission rod 601. A fixed push rod 602, which is fixed to one side of the piston rod 2 and can move up and down, is provided on one side of the synchronous transmission rod 601. A movable stop 603 is provided on one side of the fixed push rod 602. The up and down movement of the cylinder 4 can drive the fixed push rod 602 to move inside the synchronous transmission rod 601, thereby driving the synchronous transmission rod 601 to move upward synchronously, so that a pair of cylinders 4 slide synchronously on the outside of the piston rod 2.

[0021] Please see Figures 1 to 6 As shown, in the prior art, when the front wheel of a tricycle is shock-absorbing, a pair of piston rods 2 are fixed below the fixed mounting bracket 1, and a cylinder 4 is slidably sleeved on the outside of the piston rods 2. When encountering bumpy road sections, the cylinder 4 will be impacted and slide on the surface of the piston rods 2 to achieve the shock absorption effect. However, when the tricycle is driving on a road with continuous large bumps, if the front wheel is tilted on one side, the cylinder 4 on the side with the road depression will be subjected to a greater impact force than the cylinder 4 on the other side. If used for too long, it will cause damage to the shock absorber on one side and weaken the shock absorption effect of the front drive shock absorber. To avoid this situation, existing technology connects a pair of cylinders 4 with a synchronizing rod. When this happens, the impact force on the side with greater force is transferred to the other side. Although this can effectively reduce the occurrence of continuous bottoming out when one cylinder 4 slides on the piston rod 2 surface, both cylinders 4 will be subjected to the impact force at the same time. Over time, they are still prone to damage, and both will fail together. This method only reduces the bottoming out when the cylinder 4 slides on the piston rod 2 surface and extends the service life of each individual cylinder 4 when it slides on the piston rod 2 surface. It still cannot solve the problem of weakened shock absorption effect during continuous high-bump road driving. Therefore, to avoid the above situation, when the tricycle is traveling on a slightly bumpy road, the cylinder 4 will be subjected to a smaller impact, thus sliding a shorter distance on the outside of the piston rod 2. The movement of the cylinder 4 will drive the fixed push rod 602 to move synchronously. The movement of the fixed push rod 602 will push the movable stop 603 to move upward. Therefore, the movable stop 603 located inside the synchronous transmission rod 601 will drive the synchronous transmission rod 601 to move upward. The upward movement of the synchronous transmission rod 601 will drive the movable stop 603 and the fixed push rod 602 on the other side to move, so that a pair of cylinders 4 slide synchronously on the outside of a pair of piston rods 2. With the help of hydraulic oil, the front wheel shock absorption effect is achieved. When a tricycle travels on a continuous, bumpy road and one side of the cylinder 4 is subjected to a large impact, the cylinder 4 drives the fixed push rod 602 upward. At the moment of movement, the fixed push rod 602 will squeeze the movable stop 603 inside the synchronous transmission rod 601. At this time, the movable stop 603 no longer limits the fixed push rod 602, so the fixed push rod 602 will move upward inside the synchronous transmission rod 601 and perform idle running. At this time, the synchronous transmission rod 601 is no longer pushed upward by the movable stop 603, so the synchronous transmission rod 601 no longer drives the other side of the cylinder 4 to move upward synchronously. Only one side of the cylinder 4 slides a long distance on the surface of the piston rod 2, while the other side does not move too much. This can avoid the situation where both sides of the cylinder 4 slide synchronously on the surface of the piston rod 2 on a continuous, bumpy road and both cylinders 4 are subjected to a large impact at the same time, which will eventually lead to damage to both sides of the cylinder 4. It should be explained that on slightly bumpy roads, the pair of cylinders 4 slide synchronously on the surface of the piston rod 2, which can achieve a better shock absorption effect. On continuously bumpy roads, a single cylinder 4 slides on the surface of the piston rod 2, which can prevent the pair of cylinders 4 from bottoming out at the same time or bearing a large impact force. Compared with the existing technology, this can effectively improve the shock absorption effect and extend the service life of the cylinders 4 and piston rod 2, and reduce the occurrence of piston rod 2 bottoming out, whether driving on slightly bumpy roads or continuously bumpy roads.

[0022] In one specific embodiment, a cleaning ring 7 is detachably connected inside the sliding sleeve 3 for cleaning mud and dust on the surface of the piston rod 2. A collection groove is provided on the outer side above the cleaning ring 7 for collecting the scraped mud and sand.

[0023] Please see Figure 2 and Figure 3 As shown, when the tricycle is traveling on a small bumpy or flat road, the sliding distance of the cylinder 4 is relatively short. If it suddenly enters a large bumpy section from a small bumpy or flat road, the sliding distance of the cylinder 4 will suddenly increase. The mud and dust that usually adhere to the outside of the piston rod 2 will not be touched by the cylinder 4 when it moves a small distance normally. When the moving distance of the cylinder 4 increases, the dust that adheres to the outside of the piston rod 2 may enter the sliding position between the cylinder 4 and the piston rod 2, causing the cylinder 4 to get stuck during the subsequent long-term sliding process on the surface of the piston rod 2, thereby weakening the shock absorption effect. Therefore, to avoid the above situation, a detachable cleaning ring 7 is installed inside the sliding sleeve 3. When a pair of cylinders 4 slide a long distance on the upper surface of the piston rod 2, the cylinders 4 will drive the sliding sleeve 3 to slide upwards synchronously for a distance, so that the sliding sleeve 3 slides on the surface of the piston rod 2 before the cylinders 4. At this time, the cleaning ring 7 driven by the sliding sleeve 3 will slide on the surface of the piston rod 2 to clean the mud and dust in the areas that the cylinders 4 do not normally contact, thus preventing the cylinders 4 from sliding directly on the outside of the piston rod 2, which would cause the cylinders 4 to come into direct contact with a large amount of mud and dust, causing mud and dust to enter the inside of the cylinders 4, ultimately affecting the effect of the cylinders 4 sliding on the surface of the piston rod 2 and the shock absorption effect on the front wheel of the tricycle. It should be noted that when the sliding sleeve 3 is traveling on a slightly bumpy road, it will not move due to the upward movement of the synchronous transmission rod 601, because the movement distance of the synchronous transmission rod 601 is very short. Therefore, when the sliding sleeve 3 drives the cleaning ring 7 to move on the surface of the piston rod 2, it will initially come into contact with the dust adhering to the surface of the piston rod 2. Only when traveling on a continuously bumpy road will the cleaning ring 7 slide on the surface of the piston rod 2 along with the sliding sleeve 3, thereby cleaning the mud and sand on the surface of the piston rod 2 in advance. The cleaned mud and sand will be guided to the outside by the collection groove opened above the cleaning ring 7, preventing mud and sand from entering the interior of the cylinder 4, thus fully ensuring the sliding effect of the cylinder 4 on the surface of the piston rod 2, thereby improving the shock absorption effect.

[0024] In one specific embodiment, the synchronous transmission mechanism 6 further includes a limiting slide rod 605 fixedly connected to one side of the movable stop 603. A compression spring 604 is provided at the connection between the limiting slide rod 605 and the movable stop 603. The synchronous transmission rod 601 has a sliding groove 607 for the limiting slide rod 605 to slide. After the limiting slide rod 605 slides to the limit position inside the sliding groove 607, the movable stop 603 no longer limits the movement of the fixed push rod 602, ensuring that a pair of cylinders 4 can slide and absorb shock on the surface of the piston rod 2 independently.

[0025] Please see Figures 3 to 6 As shown, when the tricycle is traveling on a continuously bumpy road, the cylinder 4 slides instantly on the outside of the piston rod 2, which will drive the fixed push rod 602 to move rapidly upward inside the synchronous transmission rod 601. The upward movement of the fixed push rod 602 will squeeze the movable stop 603 to move inside the synchronous transmission rod 601. After the movable stop 603 moves, it no longer limits the fixed push rod 602, which will allow the fixed push rod 602 to move inside the synchronous transmission rod 601 and no longer apply the squeezing force to the movable stop 603. This prevents the bumpy impact force on one cylinder 4 from being transmitted to the other cylinder 4, avoiding both cylinders 4 from being subjected to a large impact force, and effectively improving the service life of the two cylinders 4. It needs to be explained that when the movable stop 603 is pushed by the fixed push rod 602 and slides inside the synchronous transmission rod 601, the movement of the movable stop 603 will cause the limiting slide rod 605 to slide inside the sliding groove 607 opened inside the synchronous transmission rod 601, so that a pair of limiting slide rods 605 move synchronously from the outside to the inside, thereby isolating the impact force received by one cylinder 4 from being transmitted to the other cylinder 4. Moreover, when the fixed push rod 602 moves to the top of the movable stop 603 inside the synchronous transmission rod 601, the fixed push rod 602... 02 will always be pressed against the movable stop 603 to prevent it from resetting under the action of the compression spring 604, which would cause a large impact force to be transmitted. When the moving distance of the cylinder 4 is shortened, the cylinder 4 will drive the fixed push rod 602 to reset inside the synchronous transmission rod 601, while the movable stop 603 will reset under the action of the compression spring 604. This allows the impact force to be transmitted to the other cylinder 4 through the movable stop 603 and the synchronous transmission rod 601 in the case of driving on small bumpy roads, thus ensuring the shock absorption effect in the case of small bumpy roads.

[0026] In one specific embodiment, a top spring 606 is provided at one end of the limiting slide bar 605 near the middle. The top spring 606 is located inside the synchronous transmission rod 601. The lower part of the movable stop 603 and the contact part of the fixed push rod 602 are both arc-shaped.

[0027] Please see Figures 3 to 6 It should be explained that, in order to prevent the fixed push rod 602 from sliding upward instantaneously inside the synchronous transmission rod 601 and pushing the movable stop 603 to move inside the synchronous transmission rod 601, which would cause the limiting slide rod 605 to slide inside the sliding groove 607 and then collide inside the synchronous transmission rod 601, a compression spring 604 is provided on the outside of the limiting slide rod 605, and a pair of top springs 606 are provided at the contact point between the limiting slide rod 605 and the fixed mounting bracket 1. When the limiting slide rod 605 slides inside the sliding groove 607, the compression spring 604 and the top springs 606 can better buffer the instantaneous sliding of the limiting slide rod 605. Furthermore, in order to allow the fixed push rod 602 to slide smoothly upward inside the synchronous transmission rod 601 and to drive the movable stop 603 to operate stably inside the synchronous transmission rod 601, the contact parts of the fixed push rod 602 and the movable stop 603 are both arranged in an arc shape. When driving on a small bumpy road, the upward squeezing force of the fixed push rod 602 is insufficient to overcome the reverse action of the compression spring 604 and the top spring 606. Therefore, the movable stop 603 can be stably pushed to slide smoothly inside the synchronous transmission rod 601. On a large bumpy road, it will stably drive the limiting slide rod 605 to slide inside the sliding groove 607.

[0028] In one specific embodiment, the part where the limiting strip 609 contacts the movable stop 603 is provided with the limiting strip 609, and the part where the movable stop 603 contacts the limiting strip 609 is provided with a limiting groove 610. When the fixed push rod 602 drives the limiting strip 609 to move upward, the limiting strip 609 will slide inside the limiting groove 610.

[0029] Please see Figures 7 to 9 As shown, when driving on a continuously bumpy road, the rapid upward movement of the fixed push rod 602 will cause the limiting strip 609 to slide inside the limiting groove 610 until the limiting strip 609 slides out of the limiting groove 610. At this time, the movable stop 603 will no longer limit the fixed push rod 602, so that the fixed push rod 602 can slide upward more smoothly inside the synchronous transmission rod 601, thereby improving the smoothness of the fixed push rod 602 disengaging from the movable stop 603. When driving on bumpy roads, the limiting strip 609 is always engaged inside the limiting groove 610, and the arc surface of the fixed push rod 602 and the movable stop 603 are always in contact. Therefore, when the cylinder 4 drives the fixed push rod 602 to move upward, it can stably drive the movable stop 603 and the synchronous transmission rod 601 to move upward, transferring the impact force on one side of the cylinder 4 to the other side of the cylinder 4, ensuring the shock absorption effect on bumpy roads.

[0030] In one specific embodiment, rectangular slots 608 are provided on both sides of the synchronous transmission rod 601, and the fixed push rod 602 slides inside the rectangular slots 608. The width of the limiting strip 609 is smaller than the width of the limiting slot 610 below the movable stop 603.

[0031] Please continue reading. Figures 7 to 9 It needs to be explained that, because the upper part of the sliding sleeve 3 is fully enclosed while the lower part is open, although it can effectively block mud and dust from the outside, it cannot stop the splashing from below. Therefore, to prevent the splashed mud and dust from entering the interior of the synchronous transmission rod 601 and affecting the sliding contact between the fixed push rod 602 and the movable stop 603, causing jamming during the sliding cooperation between the fixed push rod 602 and the movable stop 603, the width of the limiting strip 609 is set to be smaller than the width of the limiting groove 610. Even if mud and dust enter the contact area between the movable stop 603 and the fixed push rod 602, when the fixed push rod 602 drives the limiting strip 609 to slide inside the limiting groove 610, the dust will be squeezed out from the gap between the limiting strip 609 and the limiting groove 610. Figure 8 As shown; When the cylinder 4 drives the fixed push rod 602 to slide upward inside the synchronous transmission rod 601, the fixed push rod 602 will slide inside the rectangular grooves 608 opened on both sides of the synchronous transmission rod 601. On slightly bumpy roads, the fixed push rod 602 is always in a state limited by the movable stop 603, such as... Figure 4 As shown, when driving on a continuously bumpy road, the fixed push rod 602 will slide from one side of the movable stop 603 and limit one side of the movable stop 603, isolating the transmission of impact force, such as... Figure 5 As shown.

[0032] In one specific implementation, both of the fixed push rods 602 are initially attached to the lower inner side of the rectangular groove 608. The width of the fixed push rods 602 is the same as the width of the rectangular groove 608. The pair of fixed push rods 602 are horizontally symmetrical when traveling on small bumpy road sections, and vertically staggered when traveling on continuously bumpy road sections.

[0033] Please see Figures 4 to 6 As shown, regardless of whether the tricycle is traveling on a road with small bumps or continuous large bumps, the fixed push rod 602 is always in contact with the inner side of the rectangular groove 608, as... Figure 4 and Figure 5 As shown, on slightly bumpy sections, the fixed push rod 602 can push the movable stop 603 and the synchronous transmission rod 601 to move upwards synchronously. However, on heavily bumpy sections, the fixed push rod 602 disengages from the movable stop 603. After disengagement, the fixed push rod 602 moves upwards within the rectangular groove 608 in a free-stroke motion. At this time, the cylinder 4 will only slide on the surface of the piston rod 2 and will not drive the synchronous transmission rod 601 on the outside of the fixed push rod 602 to move. Only when the upper surface of the fixed push rod 602 is in contact with the inner side of the rectangular groove 608, as shown... Figure 5 As shown, at this time, the fixed push rod 602 will drive the synchronous transmission rod 601 to move upward as a whole. After the synchronous transmission rod 601 moves upward as a whole, the fixed push rod 602 on the other side will also be driven upward by the synchronous transmission rod 601, so that the two cylinders move upward synchronously one after the other. This avoids the first wave of the largest impact force from being transmitted from the cylinder 4 to the other cylinder 4. It can prevent the two cylinders 4 from moving synchronously while isolating the instantaneous transmission of impact force. When the fixed push rod 602 moves to the limit position, it will still drive the other cylinder 4 to move, so that the other cylinder 4 can distribute the impact force evenly. This avoids the cylinder 4 on the force-bearing side from hitting the bottom instantly, and can also distribute the impact force evenly, further ensuring the shock absorption effect and effectively improving its service life.

[0034] In one specific embodiment, the upper part of the limiting slide rod 605 is tapered, and the sliding groove 607 is opened inside the synchronous transmission rod 601 with the same shape as the limiting slide rod 605, but the tapered part above the limiting slide rod 605 retains a space for movement, and protective sleeves 8 are provided at both ends of the synchronous transmission rod 601 near the cylinder 4.

[0035] Please see Figures 4 to 6 It should be explained that, in order to ensure that the limiting slide rod 605 slides stably inside the sliding groove 607, and to ensure that the limiting slide rod 605 remains stably inside the synchronous transmission rod 601 when driving on bumpy roads, thereby improving the stability of the limiting slide rod 605, and fully isolating the impact force generated when the fixed push rod 602 slides instantaneously inside the rectangular groove 608, the cylinder 4 on the other side that is not subjected to impact force is protected. By setting protective sleeves 8 at both ends of the synchronous transmission rod 601 near the cylinder 4, the rigid connection between the synchronous transmission rod 601 and the cylinder 4 can be avoided, while the range of motion of the synchronous transmission rod 601 can be increased. Furthermore, it can prevent external dust and impurities from entering the sliding position of the cylinder 4 and the piston rod 2, as well as the contact position of the fixed push rod 602 and the movable stop 603.

[0036] Example 2:

[0037] In one specific embodiment, a reinforcing plate 5 is detachably connected to the lower part of the cylinder 4 to reinforce the stability between it and the front tire of the tricycle. A dust cover 12 is provided at the upper part of the cylinder 4 at the sliding contact position with the piston rod 2 to isolate mud and dust.

[0038] Please see Figure 1 , Figure 10 and Figure 11 As shown, in order to make the tire more stably installed under the cylinder 4, unlike the existing technology where the tire is directly installed, a reinforcing plate 5 is set under the cylinder 4, which can effectively improve the stability after the tire is installed. Furthermore, to prevent dust from adhering to the surface of the piston rod 2 from affecting the stability of the cylinder 4 sliding on its surface, a dust cover 12 is set above the cylinder 4, that is, below the cleaning ring 7 inside the sliding sleeve 3, which can further improve the effect of preventing mud and dust.

[0039] In one specific embodiment, a nylon sleeve 11 is provided inside the cylinder 4 for sliding engagement with the piston rod 2 to reduce sliding friction wear. An oil seal 10 is also provided above the nylon sleeve 11 to seal the internal space of the cylinder 4 and prevent hydraulic oil from leaking out. The oil seal 10 and the nylon sleeve 11 are coaxially arranged inside the cylinder 4 to protect the hydraulic oil inside the cylinder 4 and prevent hydraulic oil leakage and external impurities from entering the cylinder 4. A protective cylinder 9 is also provided inside the cylinder 4.

[0040] Please see Figure 10 and Figure 11 As shown, the oil seal 10 and nylon sleeve 11 can effectively prevent leakage of internal shock-absorbing hydraulic oil and effectively prevent external impurities from entering the cylinder 4 and affecting the cleanliness of the internal hydraulic oil, thus ensuring the shock absorption effect on the front wheel of the tricycle.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A front-wheel drive shock absorber for a tricycle, comprising a fixed mounting bracket (1), characterized in that, A pair of piston rods (2) are fixed below the fixed mounting bracket (1). A cylinder (4) is slidably sleeved on the outside of the piston rods (2). A sliding sleeve (3) is provided above the cylinder (4). A synchronous transmission mechanism (6) is provided inside the sliding sleeve (3) to improve the shock absorption effect of the front wheel of the tricycle. The synchronous transmission mechanism (6) includes a synchronous transmission rod (601). A fixed push rod (602) is fixed to one side of the piston rod (2) and can move up and down. A movable stop (603) is provided on one side of the fixed push rod (602). The cylinder (4) can move up and down to drive the fixed push rod (602) to move inside the synchronous transmission rod (601), thereby driving the synchronous transmission rod (601) to move upward synchronously, so that a pair of cylinders (4) slide synchronously on the outside of the piston rod (2).

2. The front-wheel drive shock absorber for a tricycle according to claim 1, characterized in that, The sliding sleeve (3) is detachably connected to a cleaning ring (7) for cleaning mud and dust on the surface of the piston rod (2). A collection groove is provided on the outer side of the upper part of the cleaning ring (7) for collecting the scraped mud and sand.

3. A front-wheel drive shock absorber for a tricycle according to claim 1, characterized in that, The synchronous transmission mechanism (6) also includes a limiting slide rod (605) fixedly connected to one side of the movable stop (603). A compression spring (604) is provided at the connection between the limiting slide rod (605) and the movable stop (603). The synchronous transmission rod (601) has a sliding groove (607) for the limiting slide rod (605) to slide. After the limiting slide rod (605) slides to the limit position inside the sliding groove (607), the movable stop (603) no longer limits the movement of the fixed push rod (602), ensuring that a pair of cylinders (4) can slide and dampen on the surface of the piston rod (2) independently.

4. A front-wheel drive shock absorber for a tricycle according to claim 3, characterized in that, The limiting slide bar (605) is provided with a top spring (606) near the middle end. The top spring (606) is located inside the synchronous transmission rod (601). The lower part of the movable stop (603) and the contact part of the fixed push rod (602) are both arc-shaped.

5. A front-wheel drive shock absorber for a tricycle according to claim 4, characterized in that, The fixed push rod (602) is provided with a limit strip (609) at the contact point with the movable stop (603), and a limit groove (610) is provided at the contact point between the movable stop (603) and the limit strip (609). When the fixed push rod (602) drives the limit strip (609) to move upward, the limit strip (609) will slide inside the limit groove (610).

6. A front-wheel drive shock absorber for a tricycle according to claim 5, characterized in that, The synchronous transmission rod (601) has rectangular slots (608) on both sides, and the fixed push rod (602) slides inside the rectangular slots (608). The width of the limiting strip (609) is smaller than the width of the limiting slot (610) below the movable stop (603).

7. A front-wheel drive shock absorber for a tricycle according to claim 6, characterized in that, In the initial state, both of the fixed push rods (602) are in contact with the lower inner side of the rectangular groove (608). The width of the fixed push rod (602) is the same as the width of the rectangular groove (608). The pair of fixed push rods (602) are horizontally symmetrical when traveling on small bumpy road sections, and vertically staggered when traveling on continuous large bumpy road sections.

8. A front-wheel drive shock absorber for a tricycle according to claim 7, characterized in that, The upper part of the limiting slide bar (605) is tapered, and the sliding groove (607) is opened inside the synchronous transmission rod (601) with the same shape as the limiting slide bar (605), but the tapered part above the limiting slide bar (605) has a space for movement. Protective sleeves (8) are provided at both ends of the synchronous transmission rod (601) near the cylinder (4).

9. A front-wheel drive shock absorber for a tricycle according to claim 1, characterized in that, A reinforcing plate (5) is detachably connected to the lower part of the cylinder (4) to reinforce the stability between it and the front tire of the tricycle. A dust cover (12) is provided at the upper part of the cylinder (4) and the sliding contact position with the piston rod (2) to isolate mud and dust.

10. A front-wheel drive shock absorber for a tricycle according to claim 9, characterized in that, The cylinder (4) is provided with a nylon sleeve (11) for sliding cooperation with the piston rod (2) and reducing sliding friction wear. An oil seal (10) is also provided above the nylon sleeve (11) for sealing the internal space of the cylinder (4) and preventing hydraulic oil from leaking out. The oil seal (10) and the nylon sleeve (11) are coaxially arranged inside the cylinder (4) to protect the hydraulic oil inside the cylinder (4) and prevent hydraulic oil leakage and external impurities from entering the cylinder (4). A protective cylinder (9) is also provided inside the cylinder (4).

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