CN108032947B - Motorcycle - Google Patents

Abstract

The invention discloses a motorcycle, which comprises a frame, an engine and a guard bar, wherein the guard bar comprises a transverse guard tube, a first vertical guard tube and a second vertical guard tube, the middle part of the transverse guard tube is connected with a main tube, the lower end of the first vertical guard tube is connected with the lower end of the second vertical guard tube and both are connected with a hanging plate, the upper end of the first vertical guard tube and the upper end of the second vertical guard tube are connected with the transverse guard tube and form a relative closed space, two ends of the transverse guard tube respectively extend back to form two hanging parts relative to the first vertical guard tube and the second vertical guard tube, and the guard bar further comprises two balancers which are respectively connected with the two hanging parts. According to the motorcycle provided by the invention, the mass distribution of the guard bar is changed by adding the balancer, the natural frequency of the guard bar is reduced, the resonance point of the maximum excitation force of the engine is avoided, the resonance frequency is reduced, the corresponding excitation force of the engine is reduced, and the stress born by the joint of the transverse tube and the main tube is reduced, so that the possibility of damage of the guard bar is reduced.

Description

Motorcycle

Technical Field

The invention relates to the technical field of motorcycles, in particular to a motorcycle.

Background

The motorcycle is driven by gasoline engine, and the front wheel steering is controlled by the handle to steer two-wheel or three-wheel vehicle, so that it is light, flexible and quick to run, and can be extensively used for patrol, passenger and goods transportation, etc.

The motorcycle is generally provided with a protective bar which mainly plays a role in protection, the protective bar mainly comprises vertical pipes positioned on two sides of a motorcycle body and transverse pipes crossing the two vertical pipes, two ends of each transverse pipe extend beyond the vertical pipes, the lower parts of the vertical pipes are fixed with a suspension plate of an engine, the middle parts of the transverse pipes are fixed with a main pipe of the motorcycle frame, and the protective bar is easily excited to vibrate due to the influence of the running vibration of the engine, stress concentration is generated at the joint of the transverse pipes and the main pipe, and even the cracking of the fixing points of the transverse pipes and the main pipe is caused when the stress is serious.

Disclosure of Invention

Accordingly, it is necessary to provide a motorcycle capable of reducing stress at the joint between a cross pipe and a main pipe, in order to solve the problem that the stress concentration occurs at the joint between the cross pipe and the main pipe due to the vibration of the engine operation and the vibration of the guard bar is easily excited, and even the crack occurs at the joint between the cross pipe and the main pipe in severe cases.

The motorcycle comprises a frame, an engine and a guard bar, wherein the frame comprises a main pipe vertically arranged and a main beam transversely arranged, one end of the main beam is connected with the upper end of the main pipe, two side pipes are formed by branching the other end of the main beam, an accommodating space is formed between the main pipe and the main beam, the engine is accommodated in the accommodating space, the engine is connected with the main pipe through a hanging plate of the engine, the guard bar comprises a transverse guard pipe, a first vertical guard pipe and a second vertical guard pipe which are distributed on two sides of the transverse guard pipe, the middle part of the transverse guard pipe is connected with the main pipe, the lower end of the first vertical guard pipe is connected with the lower end of the second vertical guard pipe and is connected with the hanging plate, the upper end of the first vertical guard pipe is connected with the upper end of the second vertical guard pipe and forms a relative closed space between the transverse guard pipe, two ends of the transverse guard pipe are respectively opposite to the first vertical guard pipe and the second vertical guard pipe, two hanging parts are formed by hanging back to each other, and the two hanging parts are respectively connected with two hanging balancers.

In one embodiment, each balancer is disposed outside the tail of each suspending portion, and each balancer is coaxially disposed with each suspending portion.

In one embodiment, the guard bar further comprises two first connecting pieces, and the two balancers are fixedly connected to the outside of the tail parts of the two suspended parts through the two first connecting pieces respectively.

In one embodiment, each first connecting piece comprises a bolt, a first expansion pipe, a bushing, a second expansion pipe, a buffer piece and a fixing rod, wherein the fixing rod, the second expansion pipe and the bushing are respectively arranged in the hanging part from one end far away from the balancer to one end close to the balancer, the buffer piece is sleeved outside the fixing rod and is sealed between the buffer piece and the inner wall of the hanging part, the first expansion pipe is positioned in a groove of the balancer facing the tail part of the hanging part and is abutted to the bushing, and the bolts sequentially penetrate through the balancer, the first expansion pipe, the second expansion pipe and the fixing rod.

In one embodiment, part or all of each balancer is sleeved in the corresponding suspending part.

In one embodiment, the bumper further includes two decorative covers, each of which covers the tail of each of the hanging portions when the balancer is completely sleeved in the hanging portion, or covers the tail of each of the hanging portions when the balancer is partially sleeved in the hanging portion, and seals the portions of the balancer protruding from the tail of the hanging portion.

In one embodiment, the guard bar further comprises two second connecting pieces, and the two second connecting pieces are respectively arranged on the two decorative covers and the two balancers in a penetrating manner, so that the two balancers are respectively and fixedly connected to the two suspended parts.

In one embodiment, the length of each balancer extending into each suspending portion is smaller than or equal to the length of the corresponding suspending portion.

In one embodiment, the balancer is made of a metal material, and the balancer is welded and fixed with the inner wall of the suspended part.

In one embodiment, the motorcycle further comprises two first connecting plates and two second connecting plates, one ends of the two first connecting plates are respectively connected with the lower ends of the first vertical protection pipes and the lower ends of the second vertical protection pipes, the other ends of the two first connecting plates are connected with the hanging plates, one end of the second connecting plate is connected with the middle part of the transverse protection pipe, and the other end of the second connecting plate is connected with the main pipe.

According to the motorcycle provided by the invention, the mass distribution of the guard bar is changed by adding the balancer, the natural frequency of the guard bar is reduced, the resonance point of the maximum excitation force of the engine is avoided, the resonance frequency is reduced, the corresponding excitation force of the engine is reduced, and the stress born by the joint of the transverse tube and the main tube is reduced, so that the possibility of damage of the guard bar is reduced.

Drawings

FIG. 1 is an assembly view of a motorcycle provided by a first embodiment of the present invention;

FIG. 2 is a partial assembly view of the motorcycle provided in FIG. 1;

FIG. 3 is an exploded view of the guard bar of the motorcycle provided in FIG. 1;

FIG. 4 is a partial cross-sectional view of the guard bar provided in FIG. 3;

FIG. 5 is an assembly view of a motorcycle provided by a second embodiment of the present invention;

FIG. 6 is a partial assembly view of the motorcycle provided in FIG. 5;

FIG. 7 is an exploded view of the guard bar of the motorcycle provided in FIG. 5;

fig. 8 is a partial cross-sectional view of the guard bar provided in fig. 7.

Detailed Description

In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, a first embodiment of the present invention provides a motorcycle 100 including a guard bar 10, a frame 30, and an engine 40. The frame 30 comprises a main pipe 31 vertically arranged and a main beam 32 transversely arranged, one end of the main beam 32 is connected with the upper end of the main pipe 31, the other end of the main beam 32 is branched to form two side pipes 321, a containing space 50 is formed between the main pipe 31 and the main beam 32, the engine 40 is contained in the containing space 50, the engine 40 comprises a hanging plate 41, and the engine 40 is connected with the main pipe 31 through the hanging plate 41.

The guard bar 10 comprises a transverse guard tube 110, a first vertical guard tube 120 and a second vertical guard tube 130 which are distributed on two sides of the transverse guard tube 110, wherein the lower end of the first vertical guard tube 120 is connected with the lower end of the second vertical guard tube 130 (the lower end of the first vertical guard tube 120 and the lower end of the second vertical guard tube 130 can be directly connected or indirectly connected through other components), the upper end of the first vertical guard tube 120 and the upper end of the second vertical guard tube 130 are connected with the transverse guard tube 110, opposite closed spaces are formed between the upper end of the first vertical guard tube 120 and the upper end of the second vertical guard tube 130, two ends of the transverse guard tube 110 respectively extend back to the first vertical guard tube 120 and the second vertical guard tube 130 to form a suspension portion 111, a first suspension portion 1111 and a second suspension portion 1112 respectively, and the first suspension portion 1111 and the second suspension portion 1112 are symmetrically arranged in the center of the transverse guard tube 110. Specifically, the first vertical shield 120 is integrally formed with the second vertical shield 130. In other embodiments, the first vertical tube 120 and the second vertical tube 130 may be formed separately.

The middle part of the cross tube 110 is connected with the main tube 31 of the frame 30, and the lower ends of the first and second vertical tubes 120 and 130 are respectively connected with the suspension plate 41 of the engine 40, so that the bumper 10 is mainly restrained by the frame 30 and the engine 40.

The guard bar 10 has a natural frequency, also referred to as natural frequency (natural frequency). When the object is free to vibrate, the frequency of vibration is independent of the initial conditions and is only related to the inherent characteristics of the system (such as mass, shape, material, constraints, etc.).

Analysis shows that the first-order modal frequency of the guard bar 10 is 103.1Hz, and the vibration mode of the guard bar is expressed as left-right swing; the second-order modal frequency of the guard bar 10 is 142.48Hz, and the vibration mode of the guard bar is expressed as up-and-down swing; the fourth-order modal frequency of the guard bar 10 is 313.78Hz, and the vibration mode of the guard bar is expressed as left-right distortion; the five-order modal frequency of the guard bar 10 is 329.95Hz, and the vibration mode of the guard bar is similar to swinging up and down; since the first-order inertial force of the engine 40 is a force in the front-rear direction of the entire vehicle, which is not applied to the left-right and up-down directions of the guard bar 10, it is not necessary to balance the guard bar 10 at this time.

However, since the third-order modal frequency of the guard bar 10 is 161.34Hz and the vibration mode thereof is expressed as a front-rear butterfly-like swing, and the engine 40 is mounted on the rear surface of the guard bar 10, the first-order inertial force of the engine 40 is in the front-rear direction of the whole vehicle, and the first-order maximum excitation frequency of the engine 40 is about 160Hz, the resonance between the guard bar 10 and the engine 40 is caused by the fact that the third-order modal frequency of the guard bar 10 is close to the maximum excitation frequency of the engine 40, and the higher the excitation frequency of the engine 40 is, the larger the excitation force is, and the larger the stress is, at this time, the resonance frequency needs to be lowered.

The guard bar 10 further includes two balancers 140, and the two balancers 140 are respectively connected to the first suspension 1111 and the second suspension 1112. By adding the balancer 140 to change the mass distribution of the bumper 10, the natural frequency of the bumper 10 is reduced, the resonance point of the maximum excitation force of the engine 40 is avoided, the resonance frequency is reduced, the corresponding excitation force of the engine 40 is reduced, and the stress applied to the connection part of the transverse tube 110 and the main tube 31 is reduced, thereby reducing the possibility of damage to the bumper 10.

In this embodiment, the frame 30 further includes a support tube 33, the support tube 33 includes two first support tubes 331 located at two sides and two second support tubes 332 located at two sides, one ends of the two second support tubes 332 are respectively connected with the branching positions 322 of the main beam 32 branching into two side tubes 321, one ends of the two first support tubes 331 are respectively connected with one ends of the two side tubes 321 far away from the branching positions 322 of the main beam 32, and the other ends of the two first support tubes 331 are respectively connected with one ends of the two second support tubes 332 far away from the branching positions 322 of the main beam 32. The main pipe 31, the main beam 32, and the second support pipe 332 form the accommodation space 50.

Specifically, the bumper 10 further includes two first connection plates 150 and a second connection plate 160, one ends of the two first connection plates 150 are respectively connected with the lower end of the first vertical protection tube 120 and the lower end of the second vertical protection tube 130, the other ends of the two first connection plates 150 are both connected with the suspension plate 41 of the engine 40, that is, the first vertical protection tube 120 and the second vertical protection tube 130 are respectively connected and fixed with the suspension plate 41 of the engine 40 through the two first connection plates 150, one end of the second connection plate 160 is connected with the middle part of the horizontal protection tube 110, and the other end of the second connection plate 160 is connected with the main tube 31 of the frame 30, that is, the horizontal protection tube 110 is connected and fixed with the main tube 31 of the frame 30 through the second connection plate 160. In other embodiments, the first vertical tube 120 and the second vertical tube 130 may be fixed to the suspension plate 41 by being directly connected to the suspension plate 41 of the engine 40, and the lateral tube 110 may be fixed to the frame 30 by being directly connected to the main tube 31 of the frame 30.

In this embodiment, the transverse protecting tube 110, the first vertical protecting tube 120 and the second vertical protecting tube 130 are all bent tubes, and in other embodiments, the transverse protecting tube 110, the first vertical protecting tube 120 and the second vertical protecting tube 130 may be straight tubes.

Specifically, the length of the cross tube 110 (the distance between the tail of the first suspension portion 1111 and the tail of the second suspension portion 1112) may be 576.7mm-580mm, that is, the half length of the cross tube 110 is 288.35mm-290mm, and at this time, the length of the suspension portion 111 may be 68.75mm-70.5mm, and the lengths of the first vertical tube 120 and the second vertical tube 130 are matched with the length of the cross tube 110.

One end of each balancer 140 is connected to the outside of the tail parts of the first suspension portion 1111 and the second suspension portion 1112, and each balancer 140 is coaxially disposed with the first suspension portion 1111 and the second suspension portion 1112, that is, the balancers 140 are connected to the first suspension portion 1111 and the second suspension portion 1112 in an external manner, so as to maximally reduce the stress on the bumper 10, and at this time, the balancers 140 can also play a role of an appearance decorative cover.

Referring to fig. 3 and 4, the bumper 10 further includes two first connecting members 170, and the two balancers 140 are fixedly connected to the tail portions of the first suspension portion 1111 and the second suspension portion 1112 through the two first connecting members 170, respectively.

Specifically, the first connector 170 includes a bolt 171 and a first expansion tube 172, the first expansion tube 172 is accommodated in the suspending portion 111 and is fixed to the suspending portion 111, the bolt 171 is disposed through the balancer 140 and the first expansion tube 172 from an end of the balancer 140 away from the suspending portion 111, and the balancer 140 is fixedly connected to the suspending portion 111 through the combined action of the first expansion tube 172 and the bolt 171.

More specifically, the first connecting member 170 further includes a bushing 173, a buffer member 174, a fixing rod 175, and a second expansion tube 176, where the expansion tube 172 includes a first expansion tube 172 and a second expansion tube 176, the fixing rod 175, the second expansion tube 176, and the bushing 173 are respectively disposed in the suspending portion 111 from one end far from the balancer 140 to one end near the balancer 140, the buffer member 174 is sleeved outside the fixing rod 175 and seals between the fixing rod 175 and the suspending portion 111, the balancer 140 located by the first expansion tube 172 faces the recess 141 at the tail of the suspending portion 111 and abuts against the bushing 173, the bolt 171 sequentially passes through the balancer 140, the first expansion tube 172, the second expansion tube 176, and the fixing rod 175 from one end far from the suspending portion 111 of the balancer 140, and the balancer 140 is fixed at the tail of the suspending portion 111 through the first connecting member 170.

The balancer 140 is made of PP material. In other embodiments, the balancer 140 is made of a metal material, and the balancer 140 may be fixedly connected to the suspending portion 111 by welding.

In the present embodiment, the mass sum of each of the suspending portion 111, the first connection member 170, and the balancer 140 is 45g to 150g. When the balancer 140 is selected to be welded and fixed to the suspended portion 111, the sum of the weights of the balancer 140 and the suspended portion 111 may be set to 45g to 150g.

Specifically, when the mass sum is 110g, the frequency of the guard bar 10 is 111.91Hz corresponding to the mode of the front-back butterfly swing, and the maximum stress of the transverse guard tube 110 is 135.2MPa, which is far lower than the maximum stress (166.16 MPa) of the transverse guard tube 110 when the balancer 140 is not arranged; when the mass sum is 130g, the frequency of the guard bar 10 is 107.51Hz corresponding to the mode of the front-back butterfly-shaped swing, and the maximum stress of the transverse guard tube 110 is 129.17MPa which is far lower than the maximum stress (166.16 MPa) of the transverse guard tube 110 when the balancer 140 is not arranged; when the mass sum is 150g, the frequency of the guard bar 10 is 103.591Hz corresponding to the mode of the front-back butterfly swing, and the maximum stress of the transverse guard tube 110 is 125.36MPa, which is far lower than the maximum stress (166.16 MPa) of the transverse guard tube 110 when the balancer 140 is not arranged.

Referring to fig. 5 and 6, in a second embodiment of the present invention, a motorcycle 100 is provided, which includes a bumper 20, a frame 30 and an engine 40, wherein a middle portion of a cross tube 210 is connected to a main tube 31 of the frame 30, and lower ends of a first vertical tube 220 and a second vertical tube 230 are respectively connected to a suspension plate 41 of the engine 40, so that the bumper 20 is mainly constrained by the frame 30 and the engine 40.

Other structures of the guard bar 20 are the same as those of the above embodiment, and the difference is that all of the two balancers 240 are respectively located in the first suspension portion 2111 and the second suspension portion 2112, i.e. the balancers 240 are connected to the first suspension portion 2111 and the second suspension portion 2112 in a built-in manner. Specifically, all balancers 240 are accommodated in the suspended portion 211, so as not to increase the rigidity of the bumper 20, the length of each balancer 240 extending into the first suspended portion 2111 and the second suspended portion 2112 is less than or equal to the length of the first suspended portion 2111 and the second suspended portion 2112, that is, the balancers 240 extend from the tail portion of the suspended portion 211 to the connection portion of the suspended portion 211 and the first vertical tube 220 or the second vertical tube 230 at most.

The balancer 240 is made of a metal material, and the balancer 240 is fixed to the inner wall of the suspended portion 211 by welding. In other embodiments, the balancer 240 may be connected and fixed to the suspending portion 211 in a manner similar to an expansion pipe.

Further, referring to fig. 7 and 8, the guard bar 20 further includes a decorative cover 280, all the balancers 240 are accommodated in the suspending portion 211, and the decorative cover 280 is covered on the suspending portion 211 to close the suspending portion 211, so as to ensure an attractive appearance of the transverse guard tube 210. Specifically, the decorative cover 280 is made of PP material.

The guard bar 20 further includes two second connecting members 290, wherein the second connecting members 290 penetrate through the decorative cover 280 and the balancer 240 to fixedly connect the balancer 240 to the suspending portion 211. Specifically, the balancer 240 is internally provided with a threaded hole, the second connecting member 290 is a bolt, and the second connecting member 290 is threaded with the balancer 240 after penetrating through the decorative cover 280. More specifically, a circumferential groove 281 is disposed at one end of the decorative cover 280 near the suspended portion 211, the circumferential groove 281 divides the decorative cover 280 into an embedded portion 282 and an outer peripheral portion 283, the tail portion of the suspended portion 211 is disposed in the circumferential groove 281, the embedded portion 282 extends into the suspended portion 211, and the outer peripheral portion 283 surrounds the tail portion of the suspended portion 211.

In the present embodiment, the mass sum of each of the hanging portion 211, the decoration cover 280, the second connection member 290, and the balancer 140 is 45g to 150g. When the balancer 240 is selectively welded to the suspended portion, the sum of the weights of the balancer 240 and the suspended portion 211 may be 45g to 150g.

Specifically, when the mass sum is 110g, the frequency of the guard bar 20 is 128.72Hz corresponding to the mode of the front-back butterfly swing, and the maximum stress of the transverse guard tube 210 is 152.25MPa, which is lower than the maximum stress (166.16 MPa) of the transverse guard tube 210 when the balancer 240 is not arranged; when the mass sum is 130g, the frequency of the guard bar 20 is 124.25Hz corresponding to the mode of the front-back butterfly swing, and the maximum stress of the transverse guard tube 210 is 145.84MPa and is lower than the maximum stress (166.16 MPa) of the transverse guard tube 210 when the balancer 240 is not arranged; when the mass sum is 150g, the frequency of the guard bar 20 is 120.19Hz corresponding to the mode of the front-back butterfly swing, and the maximum stress of the transverse guard tube 210 is 143.3MPa, which is lower than the maximum stress (166.16 MPa) of the transverse guard tube 210 when the balancer 240 is not provided.

The third embodiment of the present invention provides a motorcycle, comprising a guard bar, a frame 30 and an engine 40, wherein the middle part of a transverse guard tube is connected with a main tube 31 of the frame 30, and the lower ends of a first vertical guard tube and a second vertical guard tube are respectively connected with a suspension plate of the engine, so that the guard bar is mainly constrained by the frame 30 and the engine 40.

Other structures of the guard bar are the same as those of the above embodiments, and are not described herein, but the difference is that a part of the balancer is accommodated in the suspending portion. Specifically, the balancer may be fixed to the inner wall of the suspended portion by welding, and the portion of the balancer exposed to the suspended portion may be used as an external decorative cover.

In other embodiments, the guard bar further comprises a decorative cover disposed at the tail of the suspended portion and closing a portion of the balancer protruding from the tail of the suspended portion.

The invention also provides the guard bar, which comprises two balancers, wherein the two balancers are respectively connected with the first suspension part and the second suspension part, the mass distribution of the guard bar is changed by adding the balancers, the natural frequency of the guard bar is reduced, the resonance point of the maximum excitation force of an engine is avoided, the resonance frequency is reduced, the corresponding excitation force of the engine is reduced, and the stress born by the joint of the transverse tube and the main tube is reduced, so that the possibility of damage of the guard bar is reduced.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. The motorcycle comprises a frame, an engine and a guard bar, wherein the frame comprises a main pipe vertically arranged and a main beam transversely arranged, one end of the main beam is connected with the upper end of the main pipe, two side pipes are formed by branching the other end of the main beam, an accommodating space is formed between the main pipe and the main beam, the engine is accommodated in the accommodating space, and the engine is connected with the main pipe through a hanging plate thereof.

2. The motorcycle of claim 1, wherein each balancer is disposed outside a tail portion of each of the suspended portions, and each balancer is disposed coaxially with each of the suspended portions.

3. The motorcycle of claim 2, wherein the guard bar further comprises two first connecting members, and the two balancers are fixedly connected to the outside of the tail portions of the two suspended portions through the two first connecting members, respectively.

4. A motorcycle according to claim 3, wherein each of the first connecting members comprises a bolt, a first expansion pipe, a bush, a second expansion pipe, a buffer member and a fixing rod, the second expansion pipe and the bush are respectively arranged in the suspending portion from one end far from the balancer to one end close to the balancer, the buffer member is sleeved outside the fixing rod and is sealed between the buffer member and the inner wall of the suspending portion, the first expansion pipe is arranged in a groove of the balancer facing the tail of the suspending portion and is abutted against the bush, and the bolts sequentially penetrate through the balancer, the first expansion pipe, the second expansion pipe and the fixing rod.

5. A motorcycle as claimed in claim 1 wherein part or all of each balancer is nested within the corresponding suspension portion.

6. The motorcycle of claim 5, wherein the guard bar further comprises two decorative covers, each of which covers the tail of each of the hanging parts when the balancer is entirely sleeved in the hanging parts, or covers the tail of the two hanging parts when the balancer is partially sleeved in the hanging parts, and closes the parts of the two balancer protruding the tail of the hanging parts.

7. The motorcycle of claim 6, wherein the guard bar further comprises two second connecting members, the two second connecting members respectively penetrating the two decorative covers and the two balancers to fixedly connect the two balancers to the two suspending portions, respectively.

8. The motorcycle of claim 5, wherein a length of each balancer extending into each of the suspended portions is equal to or less than a length of the corresponding suspended portion.

9. The motorcycle of claim 5, wherein the balancer is made of a metal material, and is welded and fixed to an inner wall of the suspended portion.

10. The motorcycle according to any one of claims 1 to 9, further comprising two first connecting plates and a second connecting plate, wherein one ends of the two first connecting plates are connected to the lower ends of the first upright tube and the second upright tube, respectively, the other ends of the two first connecting plates are connected to the suspension plate, one end of the second connecting plate is connected to the middle portion of the lateral tube, and the other end of the second connecting plate is connected to the main tube.