JPH09263282A - Bicycle frame with shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bicycle with shock absorber which is compact and realizes a small sized as well as makes it possible to shoulder the body easily, in a terrain to allow no running. SOLUTION: This frame is composed to cushion and fluctuate a chain stay 7 and a back fork 6 to a front triangular frame 5 which consists of an upper pipe 2; a lower pipe 3; and a stand pipe 4; by a suspension unit 9. In this case, the suspension unit 9 is provided at the outer side of the front triangular frame 5, and at the upper side of the upper pipe 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle frame with a shock absorber for a cross-country competition or the like, in which a chain stay and a back hawk are configured to shock-swing with respect to a front triangular frame by a suspension unit.

[0002]

2. Description of the Related Art Conventionally, a bicycle equipped with a shock absorber, in which a chain stay and a back hawk of this kind are shock oscillated by a suspension unit with respect to a front triangular frame, is shown in, for example, FIG. There is one disclosed in Japanese Patent Laid-Open No. 7-10064. The first conventional example is a body frame 25 including an upper pipe 22, a lower pipe 23, and a standing pipe 24 arranged in a triangular shape rearward from a head pipe 21 that rotatably supports a fork of a front wheel 36, A push rod (back hawk) 26 and a swing arm (chain stay) 27, which support a rear wheel 37 that is buffer-oscillated by a rear cushion unit 29 which is a suspension unit including a coil spring and a buffer cylinder, are mounted on the vehicle body frame 25. The swing arm 27 has a front end portion pin-supported by the hanger portion 32, and an upper end portion of the push rod 26 is pinned to a link 28 supported by a pin 31 near the connecting portion between the upper pipe 22 and the standing pipe 24. It is connected 34. The rear cushion unit 29 is attached to a frame-side mounting bracket 30 provided on the lower portion of the upper pipe 22 via a unit-side mounting bracket 35 so that its position in the longitudinal direction can be adjusted and moved, and its rear end portion is connected to the link 28. A pin connection 33 is provided at the intermediate portion of.

Also, as a second conventional example, the one disclosed in JP-A-7-502950 as shown in FIG. 11 has been proposed. In this type, a lower arm (chain stay) 47 supported by a pin 56 near the lower end of the standing pipe 44 has a lower end of an upper arm (back hawk) 46 supporting an axle 58 of a rear wheel 57. Pin connection 55
The upper end of the upper arm 46 is connected to a shock absorber 49 composed of a coil spring or the like supported by a pin 57 near the upper end of the standing pipe 44.

[0004]

However, as in the case of the first conventional example, the rear cushion unit 29 is provided below the upper pipe 22, that is, the triangular body frame 25.
If the vehicle body is installed inside the vehicle, the rear cushion unit 29 becomes an obstacle when the vehicle body is carried on a terrain that cannot be traveled in a bicycle race such as a cross-country race, a camping place, or a cycling, and the triangular body frame is used. It was difficult to insert the shoulder of the human body inside 25 and carry the bicycle body up. Further, as in the case of the second conventional example, in the case where the shock absorber 49 made of a coil spring or the like is interposed at the upper end portion of the upper arm 46, the vehicle body is lifted up like in the case of the first conventional example. Although the inconvenience at the time has been resolved, the upper arm 46 is not installed because the shock absorber 49 is installed.
That is, a lot of space is required in the length direction of the back hawk, and it has been difficult to provide a bicycle with a shock absorber having a small and compact frame size.

Therefore, the present invention solves the above-mentioned problems of the prior art, makes it possible to easily carry the vehicle body up on a terrain where traveling is not possible, and has a shock absorber with a compact and small frame size. Provide a bicycle.

[0006]

For this reason, the present invention is constructed such that the chain stay and the back hawk are buffered and swung by the suspension unit with respect to the front triangular frame composed of the upper pipe, the lower pipe and the vertical pipe. In the bicycle frame with a shock absorber, the suspension unit is installed outside the front triangular frame and above the upper pipe. Further, according to the present invention, the front end of the chain stay is pin-supported in the vicinity of a hanger pipe which is a connecting portion between the lower pipe and the standing pipe, and the suspension unit and the upper end of the back hawk are connected between the upper pipe and the standing pipe. It is characterized in that the pins are connected by a swinging link having a fulcrum near the portion. Further, the invention is characterized in that the front end of the chain stay is pin-connected to the vicinity of a hanger pipe which is a connecting part of a lower pipe and a standing pipe, and the suspension unit and an upper end of a back hawk are directly connected. To do. The present invention also provides
The rear end of the chain stay and the lower end of the back hawk are pin-connected. Further, the present invention is characterized in that the vicinity of the suspension unit installation portion of the upper pipe is bent downward, and these are means for solving the problems.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is an overall side view and a plan view of only a frame portion of a bicycle with a shock absorber of the present invention, and FIG. 2 is a back hawk and a chain stay, respectively. It is an arrow view and a B arrow view. As shown in FIG. 1, a front pipe 4 is arranged rearward from a head pipe 1 that rotatably supports a front wheel hawk (not shown), and includes an upper pipe 2, a lower pipe 3, and a vertical pipe 4 into which a saddle post is inserted. A triangular frame 5 is formed, and a front end of a chain stay 7 is supported by a pin 16 in the vicinity of a hanger pipe 12 which is a connecting portion between the lower pipe 3 and the standing pipe 4 with respect to the front triangular frame 5. Further, a lower end of a back hawk 6 having a rear pawl 18 for supporting a rear wheel shaft (not shown) at a lower end thereof is connected to a rear end of the chain stay 7 by a pin 15, and an upper end of the back hawk 6 is connected. The upper pipe 2 and the vertical pipe 4
In the vicinity of the connecting portion, in this embodiment, the swinging link 8 having a fulcrum 11 inside the connecting portion is connected by a pin 14. In order that the chain stay 7 and the back hawk 6 are buffered and oscillated with respect to the front triangular frame 5, a suspension unit 9 including an air cushion, an oil damper, a coil spring and the like is provided as the front triangular frame 5. The outer end of the upper pipe 2 and the upper end of the upper pipe 2 via the mounting bracket 10 or the like, one end of which is the pin 17
And the other end of the suspension unit 9 is connected to the swing link 8 by a pin 13. As shown in FIG. 1 (B), the swing link 8 is composed of a pair of plate-like members arranged on both sides of the standing pipe 4 with the standing pipe 4 interposed therebetween. The rear end of the chain stay 7 and the lower end of the back hawk 6 are connected by a pin 15 so that the vertical pipe 4, the swing link 8, the back hawk 6 and the chain stay 7 behave like a pantograph. However, the rear end of the chain stay 7 and the lower end of the back hawk 6 may be rigidly connected without using the pin 15.

FIG. 2A is a rear view of the back fork viewed from the direction of arrow A. The upper ends of a pair of left and right back forks 6 sandwiching a rear wheel (not shown) from both sides are pinned to the swing link 8. The state of being connected by 14 is shown.
Further, FIG. 2B is a bottom view of the chain stay viewed from the arrow B, and like the back hawk, the front ends of a pair of left and right chain stays 7 sandwiching rear wheels (not shown) from both sides are Pin 16 near the hanger pipe 12
The state connected by is shown.

With this configuration, when traveling on a bad road as a mountain bike or a bicycle for cross-country competition, the chain stay 7 and the back hawk 6 which support the rear wheels due to the shock and vibration from the bad road. And the front triangular frame 5 that supports the front wheels. The vibration is based on the relative swing, and the suspension unit 9 is effectively buffered and absorbed with the swing of the swing link 8 around the fulcrum 11. Improves comfort. At that time, since the side view shape of the swing link 8 is formed in a V shape,
By appropriately setting the lengths of the arms of the pin 13 and the pin 14 from the fulcrum 11, the shock and vibration from the back hawk 6 are transmitted to the suspension unit 9 in an appropriate direction and load ratio. You can Moreover, the suspension unit 9 is installed outside the front triangular frame 5 including the upper pipe 2, the lower pipe 3, and the standing pipe 4 and above the upper pipe 2, so that the suspension unit 9 is installed inside the front triangular frame 5. Since there are no obstacles, the shoulder can be easily inserted into the front triangular frame 5 even if the terrain in which the bicycle cannot be run is encountered, and the body can be easily carried up. be able to. Then, at that time, the swing link 8 for transmitting the vibration from the back hawk 6 to the suspension unit 9 is supported by the fulcrum 11 inside the connecting portion of the upper pipe 2 and the standing pipe 4, so that the swing link 8 The length of the arm between the fulcrum 11 and the pin 13 at 8 can be made sufficiently large, in other words, the suspension unit 9 installed at the upper part of the upper pipe 2 has a form along the upper pipe 2, It doesn't have to be bulky and is compact. Also, the upper end of the back hawk 6 and the vertical pipe 4
Unlike the conventional one, the suspension unit is not disposed between the and, and only the arm of the swing link 8 is positioned. Therefore, the swing link in which the position of the arm is variously changed is appropriately set. In addition to increasing the degree of freedom in design, the length of the back hawk 6 can be fully utilized. In other words, even if a wheel of a predetermined size is used, a compact bicycle can be provided by combining it with the relatively short back hawk 6 so that passengers and children of a small size can enjoy a bicycle with a shock absorber for cross-country use. It became possible.

FIG. 3 shows a second embodiment of the present invention. The shape of the front triangular frame 5, the chain stay 7, the back hawk 6 and the suspension unit 9 are related to the front triangular frame 5 in relation to the first embodiment. In the present embodiment, the fulcrum 11 of the swinging link 8 is located at the upper rear end of the upper pipe 2 which is the outer side in the vicinity of the connecting portion between the upper pipe 2 and the standing pipe 4. are doing. As a result, unlike the first embodiment, in the present embodiment, the length of the arm between the fulcrum 11 of the swing link 8 and the connection point of the suspension unit 9 with the pin 13 is slightly longer. However, there is no member inside the front triangular frame 5, and there is no risk of foreign matter coming into contact with the shoulder inserted into the front triangular frame 5 to carry the vehicle body.

FIG. 4 shows a third embodiment of the present invention. The chain stay 7, the back hawk 6, the suspension unit 9 and the swing link 8 are related to the front triangular frame 5 in the related construction of the second embodiment. However, the present embodiment is characterized in that the vicinity of the installation portion of the suspension unit 9 in the upper pipe 2 is bent downward to provide the inclined portion 2A.
The slanted portion 2A connects the suspension unit 9 to the pin 17
Mounting bracket 1 to be installed on top of the upper pipe 2 via
It is formed by inclining the rear part from about 0 in a substantially straight line downward, and due to the existence of the inclined part 2A, it fits well on the shoulder inserted in the front triangular frame 5 for carrying up the vehicle body and reduces fatigue. Not only is it possible to
Since the fulcrum 11 of the swing link 8 is located relatively downward, the fulcrum 11 is located outside the vicinity of the connecting portion between the upper pipe 2 and the vertical pipe 4, and any foreign matter exists in the front triangular frame 5. Nevertheless, the suspension unit 9 does not become bulky with respect to the upper pipe 2, and the surroundings of the suspension unit 9 can be made compact.

FIG. 5 shows a fourth embodiment of the present invention, and the basic structure of the present embodiment is almost the same as that of the third embodiment. In the present embodiment, what corresponds to the inclined portion 2A in the third embodiment is that the rear portion from the vicinity of the mounting bracket 10 that installs the suspension unit 9 on the upper portion of the upper pipe 2 via the pin 17 has a substantially arc shape. Inclining downward, the arc-shaped inclined portion 2B is formed so as to fit more to the shoulder. As a result, the present embodiment also exhibits the same operational effects as those of the third embodiment.

FIG. 6 shows a fifth embodiment of the present invention. In this embodiment, the fulcrum 11 of the swinging link 8 stands upright with the upper pipe 2 as in the first embodiment. The pipe 4 is arranged inside the vicinity of the connecting portion, and similarly to the third embodiment of FIG. 4, the vicinity of the installation portion of the suspension unit 9 in the upper pipe 2 is bent downward linearly to form an inclined portion. 2A. As a result, the length of the arm between the fulcrum 11 and the pin 13 of the oscillating link 8 is made sufficiently large, and the fulcrum 1 of the oscillating link 8 is provided.
1 is positioned relatively downward, and the suspension unit 9 installed on the upper portion of the upper pipe 2 is arranged along the linearly bent inclined portion 2A of the upper pipe 2,
The bulkiness around the suspension unit 9 is effectively reduced.

FIG. 7 shows a sixth embodiment of the present invention. In this embodiment, unlike the embodiments described so far, the fulcrum 11 of the swing link 8A is the upper pipe 2. The rocking link 8A is provided so as to penetrate the rear end portion of the upper pipe 2 near the connecting portion of the standing pipe 4.
Has a plate shape, and the fulcrum 1 in the swing link 8A is
A connecting portion by a pin 13 on the other end side facing 1 connects the suspension unit 9 and the back hawk 6.
The upper pipe 2, the lower pipe 3 and the vertical pipe 4 which form the front triangular frame 5 are all linear.
With such a structure, the swing link 8A having a simple structure can be adopted, and the position of the pin 13 in the swing link 8A can be pulled relatively downward, so that the upper pipe 2 can be easily attached to the upper pipe 2. With the installed suspension unit 9 along the upper pipe 2, the bulkiness around the suspension unit 9 can be reduced more effectively, and the feeling of foreign matter on the shoulder when carrying the vehicle body up can be eliminated.

FIG. 8 shows a seventh embodiment of the present invention. This embodiment is similar to that of the third embodiment of FIG. 4, and includes a chain stay 7, a back hawk 6, a suspension unit. 9 and the related configuration of the swing link 8B with respect to the front triangular frame 5, the shape of the upper pipe 2 having the inclined portion 2A, and the position of the fulcrum 11 of the swing link 8B are substantially the same as those in the third embodiment. However, in the present embodiment, the rocking link 8B has a simple shape of an isosceles triangle. As a result, in addition to the effects of the third embodiment, the structure of the swing link 8B can be simplified, and the arm length from the fulcrum 11 of the pin 13 to the fulcrum 11 of the pin 14 can be changed. The arm length can be made sufficiently larger to reduce the load on the suspension unit 9 due to the impact and vibration from the back hawk 6.

FIG. 9 shows an eighth embodiment of the present invention, which is characterized in that the suspension unit 9 and the upper end of the back hawk 6 are directly connected. In the present embodiment, the upper pipe 2 further has an inclined portion 2A in which the vicinity of the installation portion of the suspension unit 9 is linearly bent downward. As a result, the suspension unit 9 can be moved along the inclined portion 2A of the upper pipe 2 to reduce the bulkiness around the suspension unit 9, and the axial movement of the back hawk 6 can be received by the suspension unit 9 in a substantially straight line and buffered. It is possible and effective cushioning is possible even with a simpler structure.

Although the respective embodiments have been described above,
Within the scope of the present invention, the shapes of the upper pipe, the lower pipe and the vertical pipe, the shapes of the chain stay and the back hawk and the related configurations between them, and the related configurations for the front triangular frame, which form the front triangular frame,
It is needless to say that the related configuration of the swing link, the back hawk and the suspension unit, the installation form of the suspension unit and the swing link with respect to the front triangular frame, the cushioning form of the suspension unit, the shape of the swing link and the like can be appropriately adopted.

[0018]

As described above in detail, according to the present invention, when traveling on a bad road such as a mountain bike or a bicycle for cross-country competition, the shock and vibration from the bad road will cause the rear wheels to travel. The vibration is based on the relative swing between the supporting chain stay and back hawk and the front triangular frame that supports the front wheels, and the suspension unit effectively buffers and absorbs with the swing of the swing link around the fulcrum. The riding comfort is improved. At that time, the side view shape of the swing link is appropriately selected, and the length of each arm between the fulcrum of the swing link and the connecting portion of the suspension unit is appropriately set to set the back hawk. Can be configured to transmit the shock and vibration from the suspension unit to the suspension unit in an appropriate direction and load factor, and the suspension unit must be installed outside the front triangular frame and above the upper pipe. Therefore, since there is no obstacle inside the front triangular frame, even if the terrain where the bicycle cannot run is encountered, the shoulder can be easily inserted into the front triangular frame, You can easily carry the body up. Also, if the swing link that should transmit the vibration from the back hawk to the suspension unit is supported by the fulcrum inside the connecting portion of the upper pipe and the vertical pipe, the fulcrum of the swing link and the suspension unit are connected. The length of the arm between the upper pipe and the upper part can be made sufficiently large, in other words, the suspension unit installed on the upper part of the upper pipe can be made compact along with the upper pipe without being bulky. Become.

Further, the suspension unit is not arranged between the upper end of the back hawk and the vertical pipe unlike the conventional one, and only the arm of the swing link is positioned. A variety of swing links can be set appropriately, which not only increases the degree of freedom in design, but also maximizes the length of the back hawk. In other words, even if you use wheels of a certain size, you can provide a compact bicycle by combining it with a relatively short back hawk, so that passengers and children with a small build can enjoy a bicycle with a shock absorber for cross-country. Became. Further, if the rear portion is formed by inclining downward from the vicinity of the suspension unit installation portion of the upper pipe, it is possible to fit well to the shoulder inserted in the front triangular frame for carrying the vehicle body up and reduce fatigue. Not only that, the fulcrum of the swing link is located relatively downward, and the fulcrum is located outside the vicinity of the connecting portion between the upper pipe and the vertical pipe, so that no foreign matter is present in the front triangular frame. Nevertheless, the suspension unit does not become bulky with respect to the upper pipe, and the surroundings of the suspension unit can be made compact. Furthermore, if the suspension unit and the upper end of the back hawk are directly connected to each other, the axial movement of the back hawk can be almost straightly received by the suspension unit and buffered,
Effective cushioning is possible even with a simpler structure.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is an overall side view and a plan view of only a frame portion of a bicycle with a shock absorber.

FIG. 2 is a view showing the first embodiment of the present invention and is a view of a back hawk and a chain stay taken along arrows A and B, respectively.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a fifth embodiment of the present invention.

FIG. 7 is a diagram showing a sixth embodiment of the present invention.

FIG. 8 is a diagram showing a seventh embodiment of the present invention.

FIG. 9 is a diagram showing an eighth embodiment of the invention.

FIG. 10 is a diagram showing a first conventional example of a bicycle with a shock absorber.

FIG. 11 is a diagram showing a second conventional example of a bicycle with a shock absorber.

[Explanation of symbols]

 1 Head Pipe 2 Upper Pipe 2A, 2B Inclined Part 3 Lower Pipe 4 Standing Pipe 5 Front Triangular Frame 6 Back Hawk 7 Chain Stay 8 Swing Link 8A, 8B Swing Link 9 Suspension Unit 10 Mounting Bracket 11 Support Point 12 Hanger Pipe 13- 17 pin 18 rear nail

Claims (5)

[Claims] 1. A bicycle frame with a shock absorber, wherein a chain stay and a back hawk are configured to shock-oscillate by a suspension unit with respect to a front triangular frame composed of an upper pipe, a lower pipe, and a vertical pipe. The bicycle frame with a shock absorber according to claim 1, wherein the bicycle frame is installed outside the front triangular frame and above the upper pipe. 2. The front end of the chain stay is pin-supported in the vicinity of a hanger pipe which is a connecting portion between a lower pipe and a standing pipe, and the suspension unit and an upper end of a back hawk are connected between the upper pipe and the standing pipe. The bicycle frame with a shock absorber according to claim 1, wherein the bicycle frame is connected by a pin by a swinging link having a fulcrum near the portion. 3. The front end of the chain stay is pin-connected to the vicinity of a hanger pipe, which is a connecting portion between the lower pipe and the standing pipe, and the suspension unit is directly connected to the upper end of the back hawk. The bicycle frame with a shock absorber according to claim 1. 4. The bicycle frame with a shock absorber according to claim 2, wherein a rear end portion of the chain stay and a lower end portion of the back hawk are pin-connected. 5. The bicycle frame with a shock absorber according to claim 1, wherein the vicinity of the suspension unit installation portion of the upper pipe is bent downward.