JPH08169377A - Shaft support of bicycle frame - Google Patents

Abstract

PURPOSE: To sufficiently hold the strength and durability of a shaft support in the connection of a front frame and rear frame of a bicycle while eliminating any play in the shaft support. CONSTITUTION: In a bicycle frame having a shock absorber interposed between a front frame F and rear frame R of a bicycle, an intermediate pipe 14 is inserted into the inside of an intermediate lug 4 provided in the connection of the front and rear frames F, R, to provided a housing 14 for a rotary shaft. A split collar 16 provided in one portion of a cylinder with a longitudinally slitted groove is inserted through a bushing 15 into the housing 14. A bracket 6 is provided on both sides of the split collar 16 in the rear and front frames R, F so that a hole 6a of the bracket 6 is aligned with a hole 16b of the split collar 16, while caps 17 with a collar are inserted respectively into these holes 6a, 16b. A bolt 18 is inserted into a center hole 17a provided in the cap 17 with the collar and fastened with a nut 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft supporting device in a connecting portion when a bicycle frame is divided into a front frame and a rear frame and these are rotatably connected.

[0002]

2. Description of the Related Art As a conventional technique of this kind, for example, there is an elastic suspension device for a rear wheel of a motorcycle disclosed in Japanese Utility Model Publication No. 40-8009.

[0003]

The above-mentioned conventional device is
Since the housing of the shaft support device for the rotating part of the rear shaft suspension part is composed of a thin pipe that penetrates the hole near the rear end of the main pipe, when a twisting force is applied to the bicycle frame, , Because it receives a twisting force at the joint of the holes drilled on the left and right of the main pipe,
The torsional rigidity of the entire frame cannot fully utilize the torsional rigidity of the main pipe, and since the diameter of the housing is small, the bearing surface pressure in the housing also becomes high.

[0004]

In order to solve the above problems, in the present invention, a head pipe, an upper standing pipe, and a front frame composed of these connecting members are integrally formed, and a lower standing pipe is formed. A back frame including a back hawk and these connecting members is integrally formed, and the front frame and the rear frame are rotatably provided near the lower end of the upper standing pipe and the upper end of the lower standing pipe. In a bicycle frame in which a shock absorber is interposed between the front frame and the rear frame, the hollow cylindrical middle pipe is inserted into the inside of the middle lug provided in the connecting portion of the front frame and the rear frame. To form a housing for the rotating shaft, and insert a split collar with a vertical split groove at one location of the cylinder through a bush into the middle pipe of this housing, and insert the front frame of the rear frame. Brackets located on both sides of the split collar are provided at the connecting portion with the frame, the holes of the bracket and the split collar are concentric, and caps with flanges are fitted into the holes on the left and right sides of the bracket, respectively. A shaft supporting device for a bicycle frame is constructed by inserting a bolt through a central hole provided in the attached cap and fastening it with a nut.

Further, according to the present invention, a hollow cylindrical middle pipe is inserted into an inner lug provided at a connecting portion with the rear frame of the front frame to form a rotary shaft housing. A shaft cylinder having a bolt insertion hole in the center is inserted through a bush, and brackets located on both sides of the shaft cylinder are provided at the connecting portion of the rear frame with the front frame. The bracket hole and the shaft cylinder hole You may insert a bolt in and fasten with a nut.

Further, according to the present invention, a pie plug is provided at a connecting portion of the rear frame with the front frame to form a housing of a rotary shaft, and a vertical split groove is provided in one portion of the cylinder through a bush in the housing. Insert a collar and provide bifurcated brackets located on both sides of the split collar at the connecting part with the rear frame of the front frame, and caps with flanges on the left and right holes of the bracket and the split collar holes, respectively. May be fitted and inserted, a bolt may be inserted through a center hole provided in the cap with the collar, and the nut may be fastened.

Further, in the present invention, in the bicycle frame shaft support device of the above-mentioned first, second and third inventions,
An annular elastic body may be interposed between at least one side surface of the housing of the rotating shaft and the flange portion of the bush.

Further, in the present invention, in the bicycle frame shaft support device of the above-mentioned first, second and third inventions,
A dust cover having ribs protruding from the outer peripheral portion of the disc may be interposed between the flange portion of at least one of the bushes and the bracket.

[0009]

As described above, in the present invention, since the diameter and axial length of the housing of the rotary shaft provided at the connecting portion between the front frame and the rear frame can be made sufficiently large, the connecting member that can be accommodated in this housing can be provided. Since the surface pressure can be kept low and the torsional rigidity of the connecting portion can be increased, the present invention can increase the strength of the connecting portion between the front frame and the rear frame and obtain sufficient durability. be able to.

Further, in the present invention, in the case where the split collar having the vertical split groove provided at one location of the cylinder is inserted in the housing, the outer diameter of the split collar is slightly larger than the inner diameter of the bush in the housing, By inserting the split collar into the bush in a compressed state, it is possible to reliably absorb the looseness of the connecting portion. If the position of the vertical dividing groove of the split collar is set on the side that is not subjected to the axial load, no adverse effect will be received.

In the present invention, if an annular elastic body such as an O-ring is interposed between the side surface of the housing of the rotary shaft and the flange portion of the bush, dust and water can be prevented from entering the housing. It is possible to absorb the looseness of the connecting portion.

Further, in the present invention, when a dust cover having a rib on the outer peripheral portion of the disk is provided between the flange portion of the bush provided in the housing and the bracket, the side surface of the bush and the dust cover are provided. The inner surfaces of the
In addition to preventing paint damage on the flange side of the bush,
The dust cover ribs that cover the sides of the housing
Dust and water can be prevented from entering.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, 1 (see FIGS. 1 and 2) is a bicycle frame head pipe, 2 is a main pipe, 3 is an upper standing pipe, 4 is a middle lug for connecting the main pipe 2 and the upper standing pipe 3, and F.
Is a front frame formed by integrally joining the head pipe 1, the main pipe 2, and the upper standing pipe 3.

Further, 5 is a lower vertical pipe, 6 is a bracket projecting from the upper end of the lower vertical pipe 5, 7 is a back hawk connected to the bracket 6, 8 is a rear pawl connected to the rear end of the back hawk 7, 9 Is a hanger connected to the lower end of the lower standing pipe 5, 10 is a chain stay provided between the hanger 9 and the rear pawl 8, R is the lower standing pipe 5, the back hawk 7,
It is a rear frame formed by integrally connecting with the chain stay 10.

Reference numeral 11 is a bracket projecting downward from the main pipe 2, 12 is a bracket projecting forward of the lower standing pipe 5, and 13 is a shock absorber interposed between the brackets 11 and 12.

1 to 5 show a first embodiment of the present invention. In this embodiment, a hollow is provided inside a middle lug 4 provided at a connecting portion with the rear frame R of the front frame F. A cylindrical middle pipe 14 is inserted to form a rotary shaft housing 14. Bushings 15 are inserted into the middle pipe 14 of the housing 14 on both left and right sides, respectively. The split collar 16 provided with the vertical split groove 16a is inserted. Further, plate-like brackets 6 located on both sides of the split collar 16 are provided at a connecting portion of the rear frame R with the front frame F, and the hole 6a of the bracket 6 and the hole 16b of the split collar 16 are concentric with each other. , The caps 17 with flanges are respectively inserted into the holes 6a, 16b on both the left and right sides, and the bolts 18 are inserted into the center holes 17a provided in the caps 17 with flanges and fastened with the nuts 19 to form a bicycle frame shaft support device. Configure.
20 is a washer.

6 and 7 show a modified example of the apparatus shown in FIG. 3, in which the same reference numerals as those used in the drawings denote the same elements. That is, FIG. 6 shows the cap 1 with a collar of FIG.
7 is replaced with a sunken cap 21 in which the protruding portion of the bolt 18 is hidden. Further, in FIG. 7, an O-ring 22 which is an annular elastic body is interposed between the side surface of the housing 14 and the flange portion 15a of the bush 15, and
Between the flange portion 15a of the bush 15 and the bracket 6, a dust cover 23 having a rib 23a protruding from the outer peripheral portion of the disk is provided.

8 to 10 show another embodiment of the present invention, in which the same reference numerals as those used in the drawings denote the same elements. In the present embodiment, the hollow cylindrical middle pipe 14 is inserted into the middle lug 4 provided at the connecting portion with the rear frame R of the front frame F to insert the housing 14 of the rotary shaft.
And a barrel 2 having a bolt insertion hole 24a at the center through a bush 15 in the middle pipe 14 of the housing 14.
4 are provided, and brackets 6 and 6 located on both sides of the shaft cylinder 24 are provided at a connecting portion of the rear frame R with the front frame F. The bracket 6 has a hole 6b and the shaft cylinder 24 has a hole 2b.
A bolt 18 is inserted through 4a and fastened with a nut 19.

FIG. 9 shows a modification in which a sinking washer 25 is used instead of the washer 20 of the apparatus of FIG. 8, and FIG. 10 shows the O-ring 22 described above in the apparatus of FIG.
The dust cover 23 is mounted, and other configurations are similar to those of the apparatus of FIG.

11 to 14 show another embodiment of the present invention, in which 1 (see FIGS. 11 and 12) is a head pipe of a bicycle frame, 2 is a main pipe, 3 is an upper standing pipe, and 26 is a pipe. Is a bifurcated bracket provided at the connecting portion between the main pipe 2 and the upper standing pipe 3, and F is formed by integrally joining the head pipe 1, the main pipe 2 and the upper standing pipe 3 together. It is the previous frame.

Reference numeral 5 is a lower standing pipe, 27 is a pie plug (housing) provided at the upper end of the lower standing pipe 5, 7 is a back hawk connected to the housing 27, and 8 is a rear pawl connected to the rear end of the back hawk 7. , 9 are hangers connected to the lower end of the lower standing pipe 5, 10 is a chain stay provided between the hanger 9 and the rear pawl 8, and R is a unit of the lower standing pipe 5, the back hawk 7, and the chain stay 10. It is a frame after being formed by bonding to.

Reference numeral 11 is a bracket projecting downward from the main pipe 2, 12 is a bracket projecting forward of the lower standing pipe 5, and 13 is a shock absorber interposed between the brackets 11 and 12.

In the present embodiment, a pie plug 27 is provided at the connecting portion of the rear frame R with the front frame F to form a housing 27 for the rotary shaft, and the cylinder 27 is inserted through the bush 15 in the housing 27 as described above. The split collar 16 provided with the vertical split groove 16a is inserted in one position, and the split collar 1 is connected to the front frame F and the rear frame R.
6 are provided with bifurcated brackets 26 located on both sides of the bracket 26, and the recessed caps 2 with flanges are provided in the holes 26a on the left and right sides of the bracket 26 and the holes 16b of the split collar 16, respectively.
8 into which the central hole 2 provided in the cap 28 with the collar is inserted.
A bolt 18 is inserted through 8a and fastened with a nut 19.

FIG. 14 shows a modification of FIG. 13, in which the above-mentioned annular elastic body O-ring 22 and dust cover 23 are attached to the apparatus of FIG. 14 device.

[0025]

As described above, in the present invention, the diameters and the axial lengths of the housings 14 and 27 of the rotary shafts provided at the connecting portion between the front frame F and the rear frame R can be made sufficiently large. Since the surface pressure of the connecting member housed in the housings 14, 27 can be kept low, and the torsional rigidity of this connecting portion can also be increased, the connecting portion between the front frame F and the rear frame R is according to the present invention. It is possible to obtain the effect that the strength can be increased and sufficient durability can be obtained.

Further, in the present invention, the housing 1
In the case where the split collar 16 having the vertical split groove 16a provided in one of the cylinders 4 and 27 is inserted, the outer diameter of the split collar 16 is slightly larger than the inner diameter of the bush 15 in the housings 14 and 27. By inserting the split collar 16 into the bush 15 in a compressed state, it is possible to reliably absorb the looseness of the connecting portion. If the position of the vertical dividing groove 16a of the split collar 16 is set on the side that is not subjected to the axial load, no adverse effect is given.

Further, in the present invention, if an annular elastic body 22 such as an O-ring is interposed between the side surfaces of the housings 14 and 27 of the rotary shaft and the flange portion 15a of the bush 15, the housings 14 and 27 can be inserted into the housings. It is possible to prevent dust and water from entering and also to absorb the play of the connecting portion.

Further, in the present invention, the housings 14 and 2 are
In the case where a dust cover 23 having a rib 23a protruding from the outer peripheral portion of the disk is interposed between the flange portion 15a of the bush 15 and the brackets 6 and 26 provided inside the bush 1,
The side surface of 5 and the inner surface of the dust cover 23 come into contact with each other to prevent damage to the coating on the flange side of the bush 15, and the ribs 23a of the dust cover 23 covering the side surfaces of the housings 14 and 27 prevent dust and water from entering. The effect is that it can be prevented.

[Brief description of drawings]

1 is a side view of a bicycle frame having a device of the present invention. FIG.

FIG. 2 is a side view of the disassembled state.

3 is a cross-sectional view showing a connecting portion between a front frame and a rear frame of FIG.

4 (a) is a front view showing a partial cross-section of the middle lug of FIG. 3, and FIG. 4 (b) is a side view thereof.

FIG. 5A is a front view of a split collar, and FIG.
FIG.

FIG. 6 is a modification view of the same portion as FIG.

FIG. 7 is a diagram of another embodiment of the present invention.

FIG. 8 is a diagram of another embodiment of the present invention.

9 is a modification diagram of the same portion as FIG.

FIG. 10 is a diagram showing another embodiment of the present invention.

FIG. 11 is a side view of a bicycle frame having the device of the present invention.

FIG. 12 is a side view of the disassembled state.

13 is a cross-sectional view showing a connecting portion between the front frame and the rear frame of FIG.

FIG. 14 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

 1 Head Pipe 2 Main Pipe 3 Upper Vertical Pipe 4 Middle Lug F Front Frame 5 Lower Vertical Pipe 6 Bracket 7 Back Hawk 8 Rear Claw 9 Hanger 10 Chain Stay R Rear Frame 11, 12 Bracket 13 Shock Absorber 14 Housing (Medium Pipe) 15 Bush 15a Flange 16 Split collar 16a Vertical split groove 16b Hole 17 Collar cap 17a Center hole 18 Bolt 19 Nut 20 Washer 21 Cavity cap 22 O-ring (annular elastic body) 23 Dust cover 23a Rib 24 Shaft cylinder 24a Bolt insertion hole 25 Sunken washer 26 Bifurcated bracket 27 Housing (pie plug) 28 Cap with collar 28a Center hole

Claims (5)

[Claims] 1. A front frame composed of a head pipe, an upper standing pipe and their connecting members is integrally formed, and a lower standing pipe, a back hawk and a rear frame composed of these connecting members are integrally formed. The front frame and the rear frame are rotatably connected near the lower end of the upper pipe and the upper end of the lower pipe, and a shock absorber is interposed between the front frame and the rear frame. In the mounted bicycle frame, a hollow cylindrical middle pipe is inserted into a middle lug provided at a connecting portion with the rear frame of the front frame to form a housing of a rotating shaft, and a bush is inserted in the middle pipe of the housing. Insert a split collar with a vertical split groove in one of the cylinders, and install brackets located on both sides of the split collar at the connecting part of the rear frame with the front frame. Align the hole of this bracket with the hole of the split collar, insert caps with flanges into the holes on both the left and right sides, insert bolts into the center holes provided in the caps with flanges, and fasten with nuts. A bicycle frame shaft support device characterized by the above. 2. A head frame, an upper standing pipe, and a front frame composed of these connecting members are integrally formed, and a lower standing pipe, a back hawk, and a rear frame composed of these connecting members are integrally formed. The front frame and the rear frame are rotatably connected near the lower end of the upper pipe and the upper end of the lower pipe, and a shock absorber is interposed between the front frame and the rear frame. In the mounted bicycle frame, a hollow cylindrical middle pipe is inserted into a middle lug provided at a connecting portion with the rear frame of the front frame to form a housing of a rotating shaft, and a bush is inserted in the middle pipe of the housing. Shaft barrel with a bolt insertion hole in the center, insert brackets located on both sides of the barrel into the connecting part of the rear frame with the front frame, A shaft supporting device for a bicycle frame, wherein a bolt is inserted into the hole of the shaft and the hole of the shaft cylinder and fastened with a nut. 3. A head frame, an upper standing pipe, and a front frame composed of these connecting members are integrally formed, and a lower standing pipe, a back hawk, and a rear frame composed of these connecting members are integrally formed. The front frame and the rear frame are rotatably connected near the lower end of the upper pipe and the upper end of the lower pipe, and a shock absorber is interposed between the front frame and the rear frame. In the mounted bicycle frame, a pie plug is provided at the connecting portion of the rear frame with the front frame to form a housing for the rotating shaft, and a split collar having a vertical split groove at one cylinder is inserted into this housing through a bush. Then, the fork-shaped brackets located on both sides of the split collar are provided at the connecting portion with the rear frame of the front frame. A shaft support device for a bicycle frame, wherein caps with flanges are fitted and inserted into the respective holes of the split collars, and bolts are inserted into the center holes provided in the caps and fastened with nuts. 4. The bicycle frame shaft support device according to claim 1, wherein an annular elastic body is interposed between at least one side surface of the rotary shaft housing and the flange portion of the bush. Characteristic bicycle frame shaft support device. 5. The bicycle frame shaft support device according to claim 1, further comprising a dust cover having ribs protruding from an outer peripheral portion of the disc between the flange portion of at least one of the bushes and the bracket. A shaft support device for a bicycle frame, characterized by being interposed.