Rear wheel suspension mechanism of motorcycle

Abstract

The utility model relates to the technical field of rear wheel suspensions of motorcycles, in particular to a rear wheel suspension mechanism of a motorcycle, which comprises a piston cylinder, a first tappet movably inserted at the bottom end of the piston cylinder, a first spring sleeved on a rod body of the first tappet, a first piston fixed at the top end of the first tappet, and a cylinder cover in threaded connection with the top end of the piston cylinder. A cavity is formed in the inner wall of the first tappet, a second tappet hole is formed in the surface of the first piston, a second tappet is fixed to the bottom end of the cylinder cover, and the second tappet is movably inserted into the second tappet hole; the motorcycle has the beneficial effects that the first spring and the second spring are arranged, when the motorcycle passes through a slight bumpy road section, the first spring with the small elasticity can filter small impact force, the riding comfort is guaranteed, when the motorcycle passes through a severe bumpy road section, the first spring and the second spring with the large elasticity act together, and therefore the motorcycle is prevented from falling off. Large impact force is filtered, and the effect of preventing topping is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motorcycle rear wheel suspensions, in particular to a motorcycle rear wheel suspension mechanism. Background Art

[0002] The motorcycle rear wheel suspension mechanism, also known as the rear suspension system, is a vital part of motorcycle design. It connects the frame and the rear wheel, and plays a role in bearing the pressure of the vehicle body, fixing the rear wheel and maintaining the stability of the vehicle body.

[0003] In the prior art, the rear wheel suspension mechanism of a motorcycle is usually composed of a piston cylinder, a tappet, a piston, a spring and a spring plate. The piston is slidably connected in the cylinder body of the piston cylinder. One end of the tappet extends into the piston cylinder and is fixed on the piston, and the other end extends from the piston cylinder and is fixed with a spring plate. The spring is sleeved on the rod body of the portion of the tappet extending out of the piston cylinder. One end of the spring abuts against the piston cylinder, and the other end abuts against the spring plate. When the rear wheel passes over a bumpy road, the vibration transmitted to the rear wheel by the road surface is filtered through the compression and extension of the spring, thereby reducing the vibration of the vehicle body, thereby protecting the vehicle body and making the rider ride more comfortably.

[0004] However, the motorcycle rear wheel suspension system in the prior art has only one spring. When the spring elasticity is too large, the vibration filtering effect will be very poor, thereby reducing the riding experience and the protection of the vehicle body. When the spring elasticity is too small, it is easy to cause the piston to hit the cylinder head of the piston cylinder, which is a topping phenomenon, resulting in a decrease in the life of the cylinder head. Utility Model Content

[0005] The purpose of the utility model is to provide a motorcycle rear wheel suspension mechanism to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a motorcycle rear wheel suspension mechanism, comprising: a piston cylinder, a first push rod movably inserted at the bottom end of the piston cylinder, a first spring sleeved on the rod body of the first push rod, a first piston fixed to the top end of the first push rod, a cylinder cover provided at the top end of the piston cylinder through a threaded connection, a cavity is formed on the inner wall of the first push rod, a second push rod hole is formed on the surface of the first piston, a second push rod is fixed to the bottom end of the cylinder cover, the second push rod is movably inserted in the second push rod hole, a second piston is fixed to the bottom end of the second push rod, the second piston is movably inserted in the cavity, and a second spring is fixed to the bottom end of the second piston.

[0007] Preferably, the top end of the first spring is fixed to the bottom end of the piston cylinder, the bottom end of the first spring is fixed with a bottom sleeve, the bottom sleeve is a cylindrical tube structure, and the bottom end of the first push rod is movably inserted in the bottom sleeve.

[0008] Preferably, the bottom end of the second spring is fixed on the inner wall of the slot of the cavity.

[0009] Preferably, a ring sleeve is fixedly mounted on the rod body of the first push rod.

[0010] Preferably, gasket grooves are provided on the surfaces of the first push rod, the first piston and the second piston. The gasket grooves are annular grooves with gaskets fixed in them. The ends of the three groups of gaskets extending out of the gasket grooves respectively abut against the bottom sleeve, the piston cylinder and the inner wall of the cavity.

[0011] Preferably, the elasticity of the first spring is smaller than the elasticity of the second spring.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The motorcycle rear wheel suspension mechanism proposed by the utility model is provided with two sets of springs, a first spring and a second spring. When the motorcycle passes through a slightly bumpy section, the first spring with smaller elasticity plays a filtering effect on smaller impact forces, thereby ensuring riding comfort. When the motorcycle passes through a violently bumpy section, the first spring and the second spring with larger elasticity work together to filter larger impact forces, thereby playing an effect of preventing topping. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 3 for Figure 2 A schematic diagram of the enlarged structure in the middle.

[0017] In the figure: piston cylinder 1, first tappet 2, bottom sleeve 3, first spring 4, first piston 5, cavity 6, second tappet hole 7, cylinder cover 8, second tappet 9, second piston 10, second spring 11, ring sleeve 12, gasket groove 13, gasket 14. DETAILED DESCRIPTION

[0018] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Embodiment 1

[0020] See also Figures 1 to 3 The utility model provides a technical solution: a motorcycle rear wheel suspension mechanism, comprising: a piston cylinder 1, a first push rod 2 is movably inserted at the bottom end of the piston cylinder 1, a first spring 4 is sleeved on the rod body of the first push rod 2, a first piston 5 is fixed to the top end of the first push rod 2, a cylinder cover 8 is provided at the top end of the piston cylinder 1 through a threaded connection, a cavity 6 is provided on the inner wall of the first push rod 2, a second push rod hole 7 is provided on the surface of the first piston 5, a second push rod 9 is fixed to the bottom end of the cylinder cover 8, the second push rod 9 is movably inserted in the second push rod hole 7, and the second push rod 9 is fixed to the bottom end of the cylinder cover 8. A second piston 10 is fixed to the bottom end of the rod 9, and the second piston 10 is movably inserted in the cavity 6. A second spring 11 is fixed to the bottom end of the second piston 10. The top end of the first spring 4 is fixed to the bottom end of the piston cylinder 1. A bottom sleeve 3 is fixed to the bottom end of the first spring 4. The bottom sleeve 3 is a cylindrical structure. The bottom end of the first push rod 2 is movably inserted in the bottom sleeve 3. The bottom end of the second spring 11 is fixed to the inner wall of the groove body of the cavity 6. A ring sleeve 12 is fixed on the rod body of the first push rod 2. The elasticity of the first spring 4 is less than the elasticity of the second spring 11.

[0021] In actual use, when the motorcycle passes through a slightly bumpy section, the impact force of the road on the wheel is transmitted to the bottom sleeve 3, causing the bottom sleeve 3 to move slightly. When the impact force is transmitted to the first spring 4 through the bottom sleeve 3, the first spring 4 is compressed under the action of the impact force. The elasticity of the first spring 4 causes the first spring 4 to generate a reaction force, which counteracts the impact force, so that the impact force is greatly weakened after being transmitted to the piston cylinder 1 through the first spring 4, so that the body installed on the top of the cylinder head 8 only bears a smaller impact force, ensuring riding comfort and protecting the body. At the same time, when the bottom sleeve 3 is moving slightly, the distance at which the first push rod 2 is inserted into the bottom sleeve 3 is constantly changing, and the elastic force brought by the rebound of the first spring 4 is offset by the direct friction between the bottom sleeve 3 and the first push rod 2, thereby maintaining the stability of the body; when the motorcycle passes through a violently bumpy section, the extremely strong impact force causes the bottom sleeve 3 to move upward significantly until the top of the bottom sleeve 3 hits the bottom end of the ring sleeve 12, thereby driving the first push rod 2 to the piston cylinder 1 The movement of the first push rod 2 makes the first piston 5 move in the same direction in the piston cylinder 1, and the length of the second push rod 9 inserted into the second push rod hole 7 is also increased accordingly and further makes the second piston 10 move to the depth of the cavity 6, which makes the second spring 11 compressed. The elastic force generated by the compression of the second spring 11 and the direct friction between the second piston 10 and the inner wall of the cavity 6, and the friction between the cavity 6 and the inner wall of the piston cylinder 1 all play a role in offsetting the impact force. On the one hand, the impact force is weakened after being transmitted to the cylinder head 8 and the vehicle body at the top of the cylinder head 8, and on the other hand, it also plays a role in preventing the first piston 5 from approaching the cylinder head 8, thereby avoiding the occurrence of topping. The rear wheel suspension mechanism of the motorcycle is provided with two groups of springs, the first spring 4 and the second spring 11. When the motorcycle passes through a slightly bumpy section, the first spring 4 with smaller elasticity filters the smaller impact force to ensure riding comfort. When the motorcycle passes through a violently bumpy section, the first spring 4 and the second spring 11 with larger elasticity work together to filter the larger impact force to prevent topping.

[0022] Embodiment 2

[0023] On the basis of Example 1, in order to increase the friction between the first push rod 2 and the bottom sleeve 3, between the piston cylinder 1 and the first piston 5, and between the cavity 6 and the second piston 10, gasket grooves 13 are provided on the surfaces of the first push rod 2, the first piston 5 and the second piston 10. The gasket groove 13 is an annular groove body, and a gasket 14 is fixed in the gasket groove 13. The ends of the three groups of gaskets 14 extending out of the gasket groove 13 respectively abut against the inner walls of the bottom sleeve 3, the piston cylinder 1 and the cavity 6.

[0024] A gasket groove 13 is provided on the surface of the first push rod 2, the first piston 5 and the second piston 10, and a gasket 14 is fixed in the gasket groove 13. One end of three groups of gaskets 14 extending out of the gasket groove 13 respectively abuts against the inner wall of the bottom sleeve 3, the piston cylinder 1 and the cavity 6. The gasket 14 is made of a rubber material with a relatively rough surface, so that the friction coefficient between the gasket 14 and the inner wall of the bottom sleeve 3, the piston cylinder 1 and the cavity 6 is relatively large, thereby increasing the friction between the first push rod 2 and the bottom sleeve 3, between the piston cylinder 1 and the first piston 5, and between the cavity 6 and the second piston 10.

[0025] In actual use, when the motorcycle passes through a slightly bumpy road section, the impact force of the road on the wheel is transmitted to the bottom sleeve 3, causing the bottom sleeve 3 to move slightly. When the impact force is transmitted to the first spring 4 through the bottom sleeve 3, the first spring 4 is compressed under the impact force. The elasticity of the first spring 4 causes the first spring 4 to generate a reaction force, which offsets the impact force, so that the impact force is greatly weakened after being transmitted to the piston cylinder 1 through the first spring 4, so that the body installed on the top of the cylinder head 8 only bears a smaller impact force, ensuring riding comfort and protecting the body. At the same time, when the bottom sleeve 3 is moving slightly, the first push rod 2 is inserted into the bottom The distance in the bottom sleeve 3 changes continuously, and the elastic force brought by the rebound of the first spring 4 is offset by the direct friction between the bottom sleeve 3 and the first tappet 2, so as to maintain the stability of the motorcycle body; when the motorcycle passes through a violently bumpy road section, the extremely strong impact force causes the bottom sleeve 3 to move upward significantly, until the top end of the bottom sleeve 3 hits the bottom end of the ring sleeve 12, thereby driving the first tappet 2 to move deep into the piston cylinder 1, and the movement of the first tappet 2 causes the first piston 5 to move in the same direction in the piston cylinder 1, then the length of the second tappet 9 inserted into the second tappet hole 7 is also increased accordingly, and the second piston 10 is further moved to the depth of the cavity 6, which compresses the second spring 11, and the second spring 11 The elastic force generated by compression and the direct friction between the second piston 10 and the inner wall of the cavity 6, and the friction between the cavity 6 and the inner wall of the piston cylinder 1 all play a role in offsetting the impact force. On the one hand, the impact force is weakened after being transmitted to the cylinder head 8 and the vehicle body at the top of the cylinder head 8. On the other hand, it also plays a role in preventing the first piston 5 from approaching the cylinder head 8, thereby avoiding the occurrence of the topping phenomenon. The rear wheel suspension mechanism of the motorcycle is provided with two sets of springs, the first spring 4 and the second spring 11. When the motorcycle passes through a slightly bumpy section, the first spring 4 with smaller elasticity has a filtering effect on the smaller impact force to ensure riding comfort. When the motorcycle passes through a violently bumpy section, the first spring 4 and the larger spring 11 have a filtering effect on the smaller impact force to ensure riding comfort. The second spring 11 works together to filter the larger impact force and prevent topping; a gasket groove 13 is opened on the surface of the first push rod 2, the first piston 5 and the second piston 10, and a gasket 14 is fixed in the gasket groove 13, and one end of the three groups of gaskets 14 extending out of the gasket groove 13 respectively abuts against the inner wall of the bottom sleeve 3, the piston cylinder 1 and the cavity 6, and the gasket 14 is made of a rubber material with a relatively rough surface, so that the friction coefficient between the gasket 14 and the inner wall of the bottom sleeve 3, the piston cylinder 1 and the cavity 6 is relatively large, thereby increasing the friction between the first push rod 2 and the bottom sleeve 3, between the piston cylinder 1 and the first piston 5, and between the cavity 6 and the second piston 10.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A motorcycle rear wheel suspension mechanism, comprising: A piston cylinder (1), a first push rod (2) is movably inserted at the bottom end of the piston cylinder (1), a first spring (4) is sleeved on the rod body of the first push rod (2), a first piston (5) is fixed at the top end of the first push rod (2), and a cylinder cover (8) is provided at the top end of the piston cylinder (1) through a threaded connection, characterized in that: a cavity (6) is opened on the inner wall of the first push rod (2), a second push rod hole (7) is opened on the surface of the first piston (5), a second push rod (9) is fixed at the bottom end of the cylinder cover (8), the second push rod (9) is movably inserted in the second push rod hole (7), a second piston (10) is fixed at the bottom end of the second push rod (9), the second piston (10) is movably inserted in the cavity (6), and a second spring (11) is fixed at the bottom end of the second piston (10).

2. A motorcycle rear wheel suspension mechanism according to claim 1, characterized in that: The top end of the first spring (4) is fixed to the bottom end of the piston cylinder (1), and a bottom sleeve (3) is fixed to the bottom end of the first spring (4). The bottom sleeve (3) is a cylindrical structure, and the bottom end of the first push rod (2) is movably inserted into the bottom sleeve (3).

3. A motorcycle rear wheel suspension mechanism according to claim 2, characterized in that: The bottom end of the second spring (11) is fixed on the inner wall of the slot of the cavity (6).

4. A motorcycle rear wheel suspension mechanism according to claim 1, characterized in that: A ring sleeve (12) is sleeved and fixed on the rod body of the first push rod (2).

5. A motorcycle rear wheel suspension mechanism according to claim 1, characterized in that: Gasket grooves (13) are provided on the surfaces of the first push rod (2), the first piston (5) and the second piston (10). The gasket grooves (13) are annular grooves. Gaskets (14) are fixed in the gasket grooves (13). One end of the three groups of gaskets (14) extending out of the gasket grooves (13) respectively abuts against the inner wall of the bottom sleeve (3), the piston cylinder (1) and the cavity (6).

6. A motorcycle rear wheel suspension mechanism according to claim 1, characterized in that: The elasticity of the first spring (4) is smaller than the elasticity of the second spring (11).

Images