Front shock absorber of a whole swing arm type three-wheel motorcycle

Abstract

The utility model provides a whole swing arm type three -wheel motorcycle front shock absorption relates to three -wheel motorcycle technical field, the utility model discloses front shock absorption includes fork, swing arm and shock absorber, wherein, fork is by upper link plate, lower link plate, fork axle and two fork pipes, with the forward direction of three -wheel motorcycle as front, and the fork pipe is bent to the back, is equipped with upper support ear on the fork pipe, swing arm is U type swing arm, and the open end faces forward and is provided, is equipped with front support ear and rear support ear on U type swing arm, and shock absorber is hinged between upper support ear and front support ear, and U type swing arm is hinged in the lower end of fork pipe through rear support ear. The utility model has solved at least three problems: first, the problem that the front wheel is prone to left and right swing and inclination is solved, second, the steering eccentricity L of front wheel is increased, the flexibility of front wheel turning and the stability of vehicle driving are improved, third, the manufacturing difficulty and manufacturing cost of fork pipe are reduced, and the shock absorption effect of front shock absorption is improved.

Description

Technical Field

[0001] This utility model is specifically a one-piece rocker arm type front shock absorber for three-wheeled motorcycles, which relates to the field of three-wheeled motorcycle technology. Background Technology

[0002] Currently, there are two main types of front shock absorbers used in three-wheeled motorcycles: linear shock absorbers and rocker arm shock absorbers (also known in the industry as Han's shock absorbers). Linear shock absorbers use the same structure as two-wheeled motorcycle shock absorbers, which suffers from structural inconsistencies and oil leaks, and are only suitable for lightly loaded three-wheeled motorcycles. Rocker arm shock absorbers mainly consist of a front fork, rocker arm, and shock absorber (for specific structure details, refer to patent CN201559773U). They are characterized by a reasonable structure, high load-bearing capacity, and good shock absorption, making them suitable for various types of three-wheeled motorcycles.

[0003] See attached document Figure 1 Currently, rocker-arm type front shock absorbers still have the following shortcomings: 1. The existing rocker arm type front shock absorber has two independent split rocker arms 4 on the left and right. When the three-wheeled motorcycle is in motion, the two split rocker arms 4 on the left and right will swing at different amplitudes due to vehicle bumps and turns, which can easily cause the front wheel 5 to sway and tilt from side to side.

[0004] 2. In the existing rocker arm type front shock absorber, the shock absorber 3 is located at the rear of the fork tube 1.3, resulting in a smaller steering eccentricity L from the center of the front wheel 5 to the axis of the fork shaft 1.5. This affects the turning agility of the front wheel 5 and the stability of the vehicle. To ensure the steering eccentricity L, the fork tube 1.3 needs to be bent forward twice, and the split rocker arm 4 also needs to be shortened. The two bends increase the manufacturing difficulty and cost of the fork tube 1.3, and the shortened arm length reduces the swing amplitude of the split rocker arm 4, affecting the overall shock absorption effect of the front shock absorber. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model discloses an integral rocker arm type front shock absorber for a three-wheeled motorcycle, adopting the following technical solution: An integral rocker arm type front shock absorber for a three-wheeled motorcycle includes a front fork, a rocker arm, and a shock absorber. The front fork consists of an upper connecting plate, a lower connecting plate, a front fork axle, and two front fork tubes. With the forward direction of the three-wheeled motorcycle as the front, the front fork tubes are bent backward and have an upper support lug. The rocker arm is a U-shaped rocker arm with its open end facing forward. A cast steel part is provided at the open end of the U-shaped rocker arm, and the cast steel part has a mounting hole for inserting the front wheel axle and a positioning boss for positioning the front wheel mounting position. The U-shaped rocker arm has a front support lug and a rear support lug. The shock absorber is hinged between the upper support lug and the front support lug. The U-shaped rocker arm is hinged to the lower end of the front fork tube through the rear support lug.

[0006] Further improvement of the technical solution: The main body of the U-shaped rocker arm is made of bent square steel tube. A constricted insertion part is integrally cast at the tail of the cast steel part. After the insertion part of the cast steel part is inserted into the square steel tube, it is welded to the square steel tube as a whole.

[0007] Further improved technical solution: The rear support lug includes a hinge seat and a pair of cast steel hinge plates welded to both sides of the square steel tube. The hinge seat is welded to the lower end of the front fork tube and clamped between the pair of cast steel hinge plates by bolts and nuts. The hinge seat consists of a seat body, a spherical bearing, a positioning sleeve, and a pair of nylon washers. A hinge hole is provided on the seat body, and the spherical bearing and the positioning sleeve are installed in the hinge hole. The pair of nylon washers are respectively provided on both sides of the spherical bearing and the seat body, used to position the spherical bearing and eliminate the axial gap between the seat body and the pair of cast steel hinge plates, and to play a wear-resistant role.

[0008] Further improve the technical solution: The front support lug is welded to the cast steel part, or cast integrally with the cast steel part.

[0009] Further improvement to the technical solution: The upper support lug is welded to the bent part of the front fork tube.

[0010] Further technical improvement: A U-shaped tube is installed between the two front fork tubes to strengthen the structural strength of the lower part of the two front fork tubes.

[0011] Further improvement to the technical solution: A front fender mounting bracket is installed at the lower part of the two front fork tubes.

[0012] After implementing the above technical solution, compared with the prior art, the present invention has the following beneficial effects: 1. The U-shaped rocker arm is an integral rocker arm with superior anti-torsional performance. Even if the front shock absorber is subjected to huge lateral forces, the two arms of the U-shaped rocker arm will only swing synchronously, solving the problem of left and right swaying and inconsistent swing amplitude that is easy to occur in split rocker arms, which in turn leads to the front wheel tilting.

[0013] 2. The steering offset L of the front wheels is increased, which improves the turning flexibility of the front wheels and the stability of the vehicle.

[0014] 3. It reduces the manufacturing difficulty and cost of the fork tube.

[0015] 4. The swing amplitude of the U-shaped rocker arm has been increased, which improves the overall shock absorption effect of the front shock absorber.

[0016] 5. The strength and machining accuracy of the U-shaped rocker arm are improved by welding castings.

[0017] 6. The unique cast hinge support structure improves the hinge strength of the rear support lugs. Attached Figure Description

[0018] Appendix Figure 1 The image shown is a front view of an existing rocker-arm type front shock absorber.

[0019] Appendix Figure 2 The diagram shown is a structural schematic of the front damping system from one perspective.

[0020] Appendix Figure 3 The diagram shown is a structural schematic of the front damper from another perspective.

[0021] Appendix Figure 4 The image shown is a front view of the front shock absorber.

[0022] Appendix Figure 5 The diagram shown is a schematic of the U-shaped rocker arm.

[0023] Appendix Figure 6 The diagram shown is a schematic of one implementation of the rear support ear.

[0024] Appendix Figure 7 The diagram shown is a schematic of another implementation of the rear support ear.

[0025] Appendix Figure 8 The diagram shows the structure of the U-shaped tube and the mounting bracket.

[0026] Attached Figure

[0027] 1. Front fork; 1.1. Upper connecting plate; 1.2. Lower connecting plate; 1.3. Front fork tube; 1.4. Upper lug; 1.5. Front fork axle; 1.6. U-tube; 1.7. Mounting bracket; 2. U-shaped rocker arm; 2.1. U-shaped square tube; 2.2. Cast steel parts; 2.21. Front wheel axle mounting hole; 2.22. Positioning boss; 2.23. Mounting boss; 2.3. Front support lug; 2.4. Rear support lug; 2.41. Cast steel hinge plate; 2.42. Powder metallurgy sleeve; 2.43. Seat; 2.44. Spherical plain bearing; 2.45. Positioning sleeve; 2.46. Bolt; 2.47. Nut; 2.48. Nylon washer; 3. Shock absorbers; 4. Split-type rocker arm; 5. Front wheels. Detailed Implementation

[0028] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of this utility model and are not intended to limit the scope of protection of this utility model. It should be noted that in the description of this utility model, terms such as "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation and positional relationship, and therefore should not be construed as a limitation of this utility model. It should also be noted that in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] An integral rocker arm type front shock absorber for three-wheeled motorcycles relates to the field of three-wheeled motorcycle technology. The composition structure and working principle of this utility model are described in detail below.

[0030] See attached document Figure 2 and attached Figure 3 The front shock absorber of this utility model includes a front fork 1, a U-shaped rocker arm 2 and a shock absorber 3. The front fork 1 is mainly composed of an upper connecting plate 1.1, a lower connecting plate 1.2, a front fork shaft 1.5 and two front fork tubes 1.3.

[0031] To address the shortcomings of the prior art, with the forward direction of the three-wheeled motorcycle as the front, the lower parts of the two front fork tubes 1.3 are bent backward, and upper lugs 1.4 are welded to the bent parts of the front fork tubes 1.3. Furthermore, this front shock absorber does not use a split rocker arm, but rather a U-shaped integral rocker arm. The open end of the U-shaped rocker arm 2 faces forward, and a pair of front lugs 2.3 and a pair of rear lugs 2.4 are welded to the two straight arms of the U-shaped rocker arm 2. The shock absorber 3 is hinged between the upper lugs 1.4 and the front lugs 2.3, and the U-shaped rocker arm 2 is hinged to the lower end of the front fork tubes 1.3 via the rear lugs 2.4.

[0032] When a three-wheeled motorcycle is in motion, the existing rocker arm type front shock absorber must not only overcome the load-bearing capacity, but also the huge lateral forces exerted on the front wheel and front shock absorber by vehicle bumps and turns. These lateral forces cause the two separate rocker arms to swing at different amplitudes, easily leading to left-right swaying and tilting of the front wheel. Because the U-shaped rocker arm 2 used in this front shock absorber is an integral rocker arm, even under huge lateral forces, the two arms of the U-shaped rocker arm 2 will only swing up and down synchronously, in the same direction, and with the same amplitude, preventing the front wheel 5 from swaying or tilting.

[0033] See attached document Figure 4 Because the fork tube 1.3 bends backward, the shock absorber 3 is hinged to the front of the fork tube 1.3, allowing the front wheel 5 to be mounted on the open end of the U-shaped rocker arm 2. This increases the steering eccentricity L of the front wheel 5, which is beneficial to improving the turning flexibility of the front wheel 5 and the stability of the vehicle.

[0034] See attached document Figure 5 The main body of the U-shaped rocker arm 2 is formed by bending a square steel tube, and the front wheel is mounted on the open end of the U-shaped rocker arm 2 through the front wheel axle. If the front wheel axle mounting hole 2.21 is machined on the bent square steel tube, it is difficult to ensure the coaxiality and structural strength of the front wheel axle mounting hole 2.21, and it is also difficult to ensure the strength required to fix the front wheel.

[0035] To ensure the coaxiality and structural strength of the front wheel axle mounting hole 2.21, the U-shaped rocker arm 2 is welded from a U-shaped square tube 2.1 and two cast steel parts 2.2. The cast steel parts 2.2 are produced using a casting process. The advantage of casting is that it allows for the casting of the required shapes onto the cast steel parts 2.2, such as the positioning boss 2.22 for locating the axial mounting position of the front wheel 5, the mounting boss 2.23 and threaded bottom hole for mounting the decorative panel, and the cast bottom hole for easy machining of the front wheel axle mounting hole 2.21. To facilitate the fixing of the hubcap, the hubcap positioning block (not shown in the figure) can also be integrally cast onto the cast steel part 2.2. A tapered insertion part is integrally cast at the tail of the cast steel part 2.2. Before welding, the insertion part is inserted into the opening of the U-shaped square tube 2.1 and then welded to the square steel tube, which increases the welding strength between the cast steel part 2.2 and the U-shaped square tube 2.1. The specific manufacturing process is as follows: After the cast steel part 2.2 is machined, the insertion parts of the two cast steel parts 2.2 are respectively inserted into the two openings of the U-shaped square tube 2.1, and then placed on the welding fixture to ensure the coaxiality and positional accuracy of the front wheel axle mounting hole 2.21. Finally, the cast steel part 2.2 and the U-shaped square tube 2.1 are welded together.

[0036] The front support lug 2.3 can be welded to the cast steel part 2.2 using a welding process, or it can be integrally cast onto the cast steel part 2.2 using a casting process. In this embodiment, the front support lug 2.3 is welded to the cast steel part 2.2, and the rear support lug 2.4 is welded to the rear part of the straight arm of the U-shaped square tube 2.1. Since the rear support lug 2.4 is a key component that ensures the U-shaped rocker arm 2 can swing flexibly up and down without swaying left and right, the rear support lug 2.4 does not adopt the U-shaped sheet metal structure of the front support lug 2.3, but instead adopts a unique cast hinge support and spherical bearing hinge structure.

[0037] See attached document Figure 6 The rear rocker arm 2.4 mainly consists of a hinge seat and a pair of cast steel hinge plates 2.41. The hinge seat is welded to the lower end of the front fork tube 1.3 and clamped between the pair of cast steel hinge plates 2.41 by bolts 2.46 and nuts 2.47. The pair of cast steel hinge plates 2.41 are welded to both sides of the straight arm section of the U-shaped square tube 2.1. Taking advantage of the casting process, flanges, product markings, and decorative panel mounting bosses 2.23 are cast onto the cast steel hinge plates 2.41. This design can significantly increase the support strength and additional functions of the hinge plates, avoid deformation and skewing of the hinge plates due to excessive force, and ensure that the U-shaped rocker arm 2 does not sway left and right during vehicle operation.

[0038] In one embodiment, the hinge seat comprises a seat body 2.43, a positioning sleeve 2.45, and a pair of L-shaped powder metallurgy sleeves 2.42. A hinge hole is provided on the seat body 2.43, and the positioning sleeve 2.45 and the pair of powder metallurgy sleeves 2.42 are installed within the hinge hole. The powder metallurgy sleeves have three functions: first, they eliminate the axial clearance between the hinge seat and the cast steel hinge plate 2.41, preventing axial movement of the hinge seat; second, they are a good wear-resistant material, effectively reducing wear on mating parts; and third, they have oil-impregnating properties and a large mating surface with the positioning sleeve 2.45, offering advantages such as good lubrication, high load-bearing capacity, and long service life.

[0039] See attached document Figure 7 In another embodiment, the hinge seat consists of a seat body 2.43, a spherical bearing 2.44, a positioning sleeve 2.45, and a pair of L-shaped nylon washers 2.48. The spherical bearing 2.44 and the positioning sleeve 2.45 are installed in the hinge hole, and the pair of nylon washers 2.48 are respectively installed on both sides of the spherical bearing 2.44 and the seat body 2.43. They are mainly used to eliminate the axial clearance between the hinge seat and the cast steel hinge plate 2.41, to prevent axial movement of the hinge seat, and to axially position the spherical bearing 2.44.

[0040] During assembly, a pair of nylon washers 2.48 are installed on both sides of the spherical plain bearing 2.44 and the seat 2.43, respectively. The positioning sleeve 2.45, spherical plain bearing 2.44, seat 2.43, and nylon washers 2.48 are clamped between a pair of cast steel hinge plates 2.41 by tightening bolts 2.46 and nuts 2.47. Because the cast steel hinge plates 2.41 have high rigidity, tightening bolts 2.46 alone is insufficient to cause significant deformation of the cast steel hinge plates 2.41, thus failing to clamp the positioning sleeve 2.45 and nylon washers 2.48. Therefore, the width dimensions of the positioning sleeve 2.45 and nylon washers 2.48 should be strictly controlled to avoid axial clearance or over-clamping between the hinge seat and the cast steel hinge plates 2.41.

[0041] See attached document Figure 8 To withstand the enormous lateral forces exerted on the fork tubes 1.3 by vehicle bumps and turns, a U-shaped tube 1.6 is welded between the two fork tubes 1.3. The U-shaped tube 1.6 can strengthen the structural strength of the lower part of the two fork tubes 1.3 and prevent the fork tubes 1.3 from deforming.

[0042] In addition, a pair of mounting brackets 1.7 are welded to the lower part of the two front fork tubes 1.3. The mounting brackets 1.7 are used to mount the front fenders.

[0043] It is worth noting that the content not described in detail in the above embodiments is prior art. It is also worth noting that any additions, subtractions, substitutions, and improvements made by those skilled in the art based on the structure and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A one-piece rocker arm type front shock absorber for a three-wheeled motorcycle, comprising a front fork, a rocker arm, and a shock absorber, wherein, The front fork consists of an upper connecting plate, a lower connecting plate, a front fork axle, and two front fork tubes. Its features include: with the forward direction of the three-wheeled motorcycle as the front, the front fork tubes bend backward, and an upper support lug is provided on the front fork tubes; the rocker arm is a U-shaped rocker arm with its open end facing forward, and a cast steel part is provided at the open end of the U-shaped rocker arm, with mounting holes for inserting the front wheel axle and a positioning boss for positioning the front wheel mounting position; the U-shaped rocker arm has a front support lug and a rear support lug, a shock absorber is hinged between the upper support lug and the front support lug, and the U-shaped rocker arm is hinged to the lower end of the front fork tube via the rear support lug.

2. The integral rocker arm type front shock absorber for a three-wheeled motorcycle as described in claim 1, characterized in that: The main body of the U-shaped rocker arm is made of bent square steel tube. A constricted insertion part is integrally cast at the tail of the cast steel part. After the insertion part of the cast steel part is inserted into the square steel tube, it is welded to the square steel tube as a whole.

3. The integral rocker arm type front shock absorber for a three-wheeled motorcycle as described in claim 2, characterized in that: The rear support lug includes a hinge seat and a pair of cast steel hinge plates welded to both sides of the square steel tube. The hinge seat is welded to the lower end of the fork tube and clamped between the pair of cast steel hinge plates by bolts and nuts. The hinge seat consists of a seat body, a spherical bearing, a positioning sleeve, and a pair of nylon washers. A hinge hole is provided on the seat body, and the spherical bearing and the positioning sleeve are installed in the hinge hole. The pair of nylon washers are respectively provided on both sides of the spherical bearing and the seat body, used to position the spherical bearing and eliminate the axial clearance between the hinge seat and the pair of cast steel hinge plates, and to provide wear resistance.

4. The integral rocker arm type front shock absorber for a three-wheeled motorcycle as described in claim 1, characterized in that: The front support lug is welded to the cast steel part or cast integrally with the cast steel part.

5. The integral rocker arm type front shock absorber for a three-wheeled motorcycle as described in claim 1, characterized in that: The upper support lug is welded to the bend of the fork tube.

6. The integral rocker arm type front shock absorber for a three-wheeled motorcycle as described in claim 1, characterized in that: A U-shaped tube is installed between the two fork tubes to strengthen the structural strength of the lower part of the two fork tubes.

7. The integral rocker arm type front shock absorber for a three-wheeled motorcycle as described in claim 1, characterized in that: Front fender mounting brackets are installed at the lower part of the two front fork tubes.

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