CN210364231U

CN210364231U - Rear bottom fork of motorcycle

Info

Publication number: CN210364231U
Application number: CN201921217546.7U
Authority: CN
Inventors: 李宁; 王伟
Original assignee: Jiangmen City Pengjiang District Xinkeda Machinery Co ltd
Current assignee: Jiangmen City Pengjiang District Xinkeda Machinery Co ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-04-21
Anticipated expiration: 2029-07-29

Abstract

The utility model discloses a motorcycle back chain stay, including chain stay left arm, chain stay right arm, connecting square pipe, the both ends of connecting square pipe respectively with chain stay left arm and chain stay right arm welding, the front end of chain stay left arm and chain stay right arm all is provided with the bearing frame, the bearing frame is provided with connecting bearing, the rear end of chain stay left arm and chain stay right arm all is provided with the U type groove that is used for installing the rear axle, the position of chain stay left arm and chain stay right arm directly over U type groove all is provided with the damping spring connecting seat. The utility model discloses a both ends of connecting square pipe weld with chain stay left arm and chain stay right arm respectively, can improve the joint strength between connecting square pipe and chain stay left arm, chain stay right arm to connecting square pipe self is square, can play the supporting role better, and dispersed stress, thereby reduce stress concentration's the condition, promote the structural strength of back chain stay greatly, avoid the fracture of back chain stay, let the security performance of back chain stay better.

Description

Rear bottom fork of motorcycle

Technical Field

The utility model relates to a motorcycle accessories technical field, in particular to motorcycle back chain stay.

Background

The rear wheel frame of the motorcycle, also called rear bottom fork, is one of the important parts of the motorcycle, belongs to the suspension device of the motorcycle, is used for installing the rear wheel and matching with the shockproof system, and the strength and the rigidity of the rear wheel frame have great influence on the driving safety performance of the motorcycle. The whole of the back chain stay of present motorcycle is H type double armed plane back chain stay, and its left arm and right arm are connected through two connecting plates at middle part and are formed, and wherein the upper and lower both sides of left arm and right arm are connected respectively to the connecting plate, but the structural strength of such connecting plate is lower, and under the state of atress, stress concentration appears easily in the connecting plate and the connecting position of left arm, right arm, can cause junction fatigue strength not enough and take place the cracked condition of back chain stay, and the security performance is not good enough.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide a structural strength is higher, the better motorcycle rear fork of security performance.

The utility model provides a motorcycle rear chain stay, including chain stay left arm, chain stay right arm, connecting square pipe's both ends respectively with chain stay left arm with chain stay right arm welding, chain stay left arm with the front end of chain stay right arm all is provided with the bearing frame, the bearing frame is provided with connection bearing, chain stay left arm with the rear end of chain stay right arm all is provided with the U type groove that is used for installing the rear axle, chain stay left arm with chain stay right arm is in the position directly over U type groove all is provided with the shock attenuation spring coupling seat.

Has the advantages that: the shape of the laminating of side's of connecting pipe both ends cutting into with chain stay left arm and chain stay right arm, then the both ends of side's of connecting pipe weld with chain stay left arm and chain stay right arm respectively, can let two ports of side's of connecting pipe well with the chain stay left arm like this, the laminating of chain stay right arm, and the welded gap is the frame type, can improve side's of connecting pipe and chain stay left arm, joint strength between the chain stay right arm, and side's of connecting pipe self is square, can play the supporting role better, dispersed stress, thereby reduce the condition of stress concentration, promote the structural strength of back chain stay greatly, avoid the fracture of back chain stay, let the security performance of back chain stay better.

As an improvement of the scheme, the bottom fork left arm and the bottom fork right arm are both square steel tubes, and the cross sectional areas of the bottom fork left arm and the bottom fork right arm are larger than the connecting square tubes.

As a further improvement of the scheme, the front ends of the bottom fork left arm and the bottom fork right arm are both provided with a conical section, and the front end of the conical section is connected with the bearing seat.

Further, the bearing frame is cylindric, the last side and the downside of toper section all with the outside of bearing frame is tangent.

Further, the both ends rear side of connecting square pipe is provided with first strengthening rib and second strengthening rib respectively, first strengthening rib with the chain stay left arm is connected, the second strengthening rib with the chain stay right arm is connected.

Furthermore, the first reinforcing rib and the second reinforcing rib respectively comprise a middle supporting plate and two side plates, and the two side plates are respectively connected to two sides of the middle supporting plate.

Further, the lower side of the connecting square pipe is provided with a drum brake torsion bar seat.

Furthermore, the upper side surface of the bottom fork left arm or the bottom fork right arm is provided with a disc brake torque rod seat.

Drawings

The present invention will be further described with reference to the accompanying drawings and examples;

fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of another view angle of the first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first reinforcing rib according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second embodiment of the present invention;

fig. 5 is a schematic structural diagram of another view angle of the second embodiment of the present invention;

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 and 2, a rear bottom fork of a motorcycle comprises a left bottom fork arm 10, a right bottom fork arm 20 and a square connecting pipe 30, wherein two ends of the square connecting pipe 30 are respectively welded with the left bottom fork arm 10 and the right bottom fork arm 20, front ends of the left bottom fork arm 10 and the right bottom fork arm 20 are respectively provided with a bearing seat 11, the bearing seats 11 are provided with a connecting bearing 12, rear ends of the left bottom fork arm 10 and the right bottom fork arm 20 are respectively provided with a U-shaped groove 13 for mounting a rear wheel, and positions of the left bottom fork arm 10 and the right bottom fork arm 20 right above the U-shaped groove 13 are respectively provided with a damping spring connecting seat 40. The shape of the laminating of square connecting tube 30 both ends cutting one-tenth and chain stay left arm 10 and chain stay right arm 20, then square connecting tube 30's both ends weld with chain stay left arm 10 and chain stay right arm 20 respectively, can let square connecting tube 30's two ports well with chain stay left arm 10 like this, the laminating of chain stay right arm 20, and the welded gap is the frame type, can improve square connecting tube 30 and chain stay left arm 10, the joint strength between the chain stay right arm 20, and square connecting tube 30 self is square, can play the supporting role better, dispersed stress, thereby reduce the condition of stress concentration, promote the structural strength of back chain stay greatly, avoid the back chain stay fracture, let the security performance of back chain stay better. It should be noted that the U-shaped groove 13 is used for installing a rear axle, the rear axle can be directly installed on the rear fork from the rear opening of the U-shaped groove 13 for fixing, and the damping spring seat is located right above the U-shaped groove 13, so that the damping spring can better reduce the impact force caused by the rear axle, and better damp the motorcycle. The connecting bearing 12 is used for connecting a motorcycle frame, so that the rear bottom fork can be rotatably connected to the motorcycle frame to form a rear wheel frame system.

Preferably, the bottom fork left arm 10 and the bottom fork right arm 20 are both square steel pipes, and the cross-sectional area is larger than the connecting square pipe 30. The structural strength of chain stay left arm 10 and chain stay right arm 20 will be bigger like this, can let the welding of connecting square pipe 30 on chain stay left arm 10 and chain stay right arm 20 better moreover, promote holistic structural strength, let the bearing of back chain stay bigger.

Referring to fig. 1 and 2, preferably, the front ends of the bottom fork left arm 10 and the bottom fork right arm 20 are each provided with a tapered section 14, and the front end of the tapered section 14 is connected to the bearing seat 11. The cross-sectional area of the front ends of the bottom fork left arm 10 and the bottom fork right arm 20 can be reduced by the arrangement, and the welding of the bearing seat 11 is facilitated. Also, most preferably, the bearing support 11 is cylindrical, with both the upper and lower sides of the tapered section 14 tangent to the outside of the bearing support 11. The upper side and the lower side of the conical section 14 are connected with the outer side of the bearing seat 11, so that the bearing seat 11 is better stressed, the upper side and the lower side of the conical section 14 support the bearing seat 11 better, and the structural strength is improved.

Referring to fig. 1, preferably, the rear sides of both ends of the square connecting tube 30 are respectively provided with a first reinforcing rib 50 and a second reinforcing rib 60, the first reinforcing rib 50 is connected to the left bottom fork arm 10, and the second reinforcing rib 60 is connected to the right bottom fork arm 20. The first reinforcing rib 50 can strengthen the connection strength between the square connecting tube 30 and the bottom fork left arm 10, and the second reinforcing rib 60 can strengthen the connection strength between the square connecting tube 30 and the bottom fork right arm 20, so that the structural strength of the whole rear bottom fork is improved, and the bearing of the rear bottom fork is improved.

Referring to fig. 3, preferably, each of the first and second reinforcing

beads

50 and 60 includes a middle support plate 51 and two side plates 52, and the two side plates 52 are respectively connected to both sides of the middle support plate 51. Middle part fagging 51 links to each other with two curb plates 52, can let two curb plates 52 and middle part fagging 51 all can play the reinforcement effect of strengthening rib, can improve the joint strength between connection side pipe 30 both ends and chain stay left arm 10, chain stay right arm 20 to improve holistic structural strength. It should be noted that the first reinforcing rib 50 and the second reinforcing rib 60 are both formed by cutting a channel steel.

Referring to fig. 1 and 2, in some embodiments, in order to facilitate installation of the drum brake on the rear wheel axle, a drum brake torsion bar seat 70 is provided at the lower side of the connecting square pipe 30. When the motorcycle needs to be provided with the drum brake, a rear bottom fork with a drum brake torsion bar seat 70 is selected.

Referring to fig. 4 and 5, in some embodiments, in order to facilitate installation of the disc brake on the rear axle, the disc brake torsion bar seat 80 is disposed on the upper side surface of the bottom fork left arm 10 or the bottom fork right arm 20. When the motorcycle needs to be provided with the disc brake, the rear bottom fork with the disc brake torsion bar seat 80 is selected.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge range of those skilled in the art.

Claims

1. A motorcycle rear bottom fork is characterized in that: including chain stay left arm (10), chain stay right arm (20), connecting square pipe (30), the both ends of connecting square pipe (30) respectively with chain stay left arm (10) with chain stay right arm (20) welding, chain stay left arm (10) with the front end of chain stay right arm (20) all is provided with bearing frame (11), bearing frame (11) are provided with coupling bearing (12), chain stay left arm (10) with the rear end of chain stay right arm (20) all is provided with U type groove (13) that are used for installing the rear wheel axle, chain stay left arm (10) with chain stay right arm (20) are in the position directly over U type groove (13) all is provided with damping spring connecting seat (40).

2. A motorcycle rear fork as claimed in claim 1, wherein: the bottom fork left arm (10) and the bottom fork right arm (20) are both square steel pipes, and the cross-sectional area is larger than the connecting square pipe (30).

3. A motorcycle rear fork as claimed in claim 2, wherein: the front ends of the bottom fork left arm (10) and the bottom fork right arm (20) are both provided with a conical section (14), and the front end of the conical section (14) is connected with the bearing seat (11).

4. A motorcycle rear fork as claimed in claim 3, wherein: the bearing seat (11) is cylindrical, and the upper side face and the lower side face of the conical section (14) are tangent to the outer side of the bearing seat (11).

5. A motorcycle rear fork as claimed in claim 1, wherein: the rear sides of the two ends of the connecting square pipe (30) are respectively provided with a first reinforcing rib (50) and a second reinforcing rib (60), the first reinforcing rib (50) is connected with the bottom fork left arm (10), and the second reinforcing rib (60) is connected with the bottom fork right arm (20).

6. A motorcycle rear fork as claimed in claim 5, wherein: the first reinforcing rib (50) and the second reinforcing rib (60) respectively comprise a middle supporting plate (51) and two side plates (52), and the two side plates (52) are respectively connected to two sides of the middle supporting plate (51).

7. A motorcycle rear fork as claimed in any one of claims 1 to 6, wherein: and a drum brake torsion bar seat (70) is arranged on the lower side of the connecting square pipe (30).

8. A motorcycle rear fork as claimed in any one of claims 1 to 6, wherein: and a disc brake torque rod seat (80) is arranged on the upper side surface of the bottom fork left arm (10) or the bottom fork right arm (20).