JPH07237575A - Hanger part structure for bicycle - Google Patents

Abstract

PURPOSE:To attain simplification of assembly and ensuring of rotary condition by forming a corresponding slope in one side part of these hanger part and sleeve, and screwing the other side part thereof so that the corresponding slope comes into press contact, in the hanger part of a bicycle and the sleeve of a crankshaft unit mounted on this hanger part. CONSTITUTION:In a hanger part 10 of a bicycle, rugs 16a, 16b are formed in the right/left. Here in an internal peripheral surface in the one rug 16a, a tapered surface (slope) 31, decreased smaller in accordance with leading to the inside from the outside, is formed. In an internal peripheral surface in the other rug 16b, an internal thread 33, to which a crankshaft unit 34 is screwed, is engraved. Here in the crankshaft unit 34, a crankshaft 35 is supported by bearing to the inside of a sleeve 39 through balls 42 or the like and formed into a unit. In a peripheral surface in one end side of the sleeve 39, a tapered surface (slope) 44 with the angle agreeing with the tapered surface 31 of the rug 16a is formed. Further in the other side of the sleeve 39, an external thread 46 screwed to an internal thread 33 of the rug 16b is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle hanger portion structure in which a unitized crankshaft unit is mounted on a bicycle hanger portion.

[0002]

2. Description of the Related Art FIG. 1 shows a hanger portion of a bicycle. The hanger portion 10 is formed on a frame 12 of a bicycle 11,
A crank shaft 15 for fixing a gear crank 14 having a pedal 13 is rotatably inserted.

FIG. 2 shows a structure of a conventional hanger portion, wherein the hanger portion 10 is formed as a member different from the frame 12.
The hanger portion 10 is welded to the frame 12 and further
Female screws 17, 17 are engraved on the inner peripheral surfaces of the left and right lugs 16, 16 penetrating in the left-right direction.
7 is a male screw 1 engraved on the outer peripheral surface of the left and right ones 18, 18.
9 and 19 are screwed together, and the left and right ball contact portions 20 and 20 of the crankshaft 15 and the ball contact portions 2 of the left and right ones 18 and 18 are further connected.
The crankshaft 15 is supported by the left and right ones 18, 18 by interposing balls 22, 22 between the crankshaft 15 and the ones 21, 21. In the figure, numeral 23 is a hanger lock nut.

In the case of the hanger portion structure as described above, since the hanger portion 10 is fixed to the frame 12 by welding, the shapes (roundness) of the left and right lugs 16 and 16 and the core wire are heated by the welding. The left and right ones 18, 18 screwed to the left and right lugs 16, 16 are not screwed well, and even if the ones 18, 18 are screwed in, the core wires are left and right displaced, There is a problem that a smooth rotational tone of the bearing cannot be obtained.

Further, when assembling the crankshaft 15 to the hanger portion 10, it is necessary to screw the two left and right ones 18, 18 together, which is a troublesome work, and the left and right ones 18, 18 are also involved. If the circularity is deformed by quenching and the circularity becomes low, the bearing core of the crankshaft 15 is further deformed in combination with the deviation of the left and right lugs 16 and 16 and the core wire. There is a problem that the condition becomes worse.

[0006]

SUMMARY OF THE INVENTION The present invention does not affect the rotational tone of the crankshaft due to the deformation of the female screw due to the thermal deformation of the left and right lugs of the hanger portion. Since it is possible to eliminate one or both of the female threads for the crankshaft and the screwing work for mounting the crankshaft at one place, the crankshaft can be easily assembled and the workability is improved. An object of the present invention is to provide a bicycle hanger structure that does not impair the rotation of the crankshaft.

[0007]

According to a first aspect of the present invention, there is provided a bicycle hanger portion structure in which a crankshaft unit, which is formed by bearing a crankshaft in a sleeve, is mounted on a bicycle hanger portion. An inclined surface inclined in the axial direction is formed on the outer peripheral surface of the sleeve on one end side of the crankshaft unit, and an inner peripheral surface of the hanger portion corresponding to the inclined surface is formed on a corresponding inclined surface corresponding to the sleeve inclined surface. A bicycle hanger structure is characterized in that the other end side of the sleeve is screwed to a corresponding hanger part in a direction in which the mutual slopes are in pressure contact with each other.

According to a second aspect of the present invention, there is provided a bicycle hanger portion structure in which a crankshaft unit bearing a crankshaft in a sleeve is unitized to be mounted on a bicycle hanger portion. An outer peripheral surface of the sleeve on one end side is formed with an inclined surface which becomes smaller from the inner side to the outer side, and an inner peripheral surface of the hanger portion corresponding to the inclined surface is formed on a corresponding inclined surface corresponding to the sleeve inclined surface. It is characterized in that it has a structure of a bicycle hanger in which the end side is screwed to the corresponding hanger portion in the direction in which the mutual slopes are pressed against each other.

According to a third aspect of the present invention, there is provided a bicycle hanger portion structure in which a crankshaft unit bearing a crankshaft in a sleeve is unitized to be mounted on a bicycle hanger portion. On the outer peripheral surface of the sleeve on one end side, a slope that becomes smaller from the outer side to the inner side is formed, and a male screw for fastening is engraved on the other end side of the sleeve, and a mounting female screw corresponding to this is engraved. In addition to installing the installed mounting nut, the outer peripheral surface of this mounting nut is formed with a slope that decreases from the outside to the inside, and the inner peripheral surface of the hanger part corresponding to the mounting nut corresponds to the slope of the mounting nut. It is characterized in that it is a bicycle hanger portion structure which is formed on an inclined surface, and the mounting nut is screwed to the male screw of the sleeve to fasten the mutual inclined surfaces.

The invention according to claim 4 of the present invention is characterized in that the slant surface of the sleeve is a bicycle hanger portion structure formed into a linear taper surface. According to a fifth aspect of the present invention, the slope of the sleeve has a hanger portion structure of a bicycle formed in a spherical surface.

[0011]

According to the first, second, fourth, or fifth aspect of the present invention, a sloped surface such as a tapered surface or a spherical surface formed on one end side of the sleeve of the crankshaft unit is fitted to the corresponding sloped surface of the hanger portion, The other end side of the sleeve is screwed to the corresponding hanger portion.

According to a third, fourth or fifth aspect of the present invention, a sloped surface such as a tapered surface or a spherical surface formed on the sleeve of the crankshaft unit is aligned with the corresponding sloped surface of the hanger portion, and the other end side of the sleeve is provided. The mounting nut is screwed by aligning the taper surface or the spherical slope formed on the outer peripheral surface of the mounting nut to be screwed with the corresponding slope of the hanger portion.

[0013]

According to the invention of claim 1 or 2 of the present invention, by forming an inclined surface on one end of the sleeve of the crankshaft unit, only one female thread is formed on the hanger portion for mounting the unit. It is sufficient to form a corresponding slope on the other side, which simplifies the processing of the hanger part, and even if the hanger part is thermally deformed due to welding to the frame, there is only one female thread. The other side is a slope even if the circularity of the unit is slightly different, and when a unitized crankshaft unit is installed, automatic centering is performed and the effect of thermal deformation of the hanger part is exerted on the crankshaft unit. The smooth rotation of the crankshaft can be directly attached to the hanger and maintained.

Further, the crankshaft unit can be mounted by aligning one slope of the sleeve with the corresponding slope of the hanger and screwing the other of the sleeve to the other of the hanger, so that the screwing work is done at one place. Assembly work becomes easy and easy,
Workability is improved. Further, by forming the above-mentioned inclined surface on the sleeve of the crankshaft unit as described above, it is possible to increase the diameter of the ball contact portion in the inclined surface side sleeve, and as a result, use a large diameter ball for the bearing. As a result, the bearing becomes strong and stable, and a good rotational tone can be obtained.

According to the third aspect of the present invention, it is not necessary to process the female thread on the hanger portion, and the hanger portion can be easily processed only on the slope. Further, according to the invention of claim 4 or 5, the above-mentioned effect can be obtained by forming the inclined surface into a tapered surface or a spherical surface.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The drawing shows one embodiment of the present invention, and in FIG. 3, the hanger portion 10 is the hanger portion 10 of the bicycle 11 shown in FIGS.
16b is formed.

On the inner peripheral surface of one of the lugs 16a,
Tapered surface (slope) 31 that decreases from the outside to the inside
Is formed. A female screw 33 is engraved on the inner peripheral surface of the other lug 16b, and a crankshaft unit 34, which will be described later, is screwed into the female screw 33.

The above crankshaft unit 34 is constructed as follows. That is, the crankshaft 35 has a ball contact portion 36 integrally formed on one side and a ring-shaped ball contact portion 37 screwed at a position spaced apart from this by a predetermined distance. A stop nut 38 for stopping the ball contact portion 37 is screwed to the outside of the contact portion 37 via a spring washer 32.

The above-mentioned crankshaft 35 bears in the sleeve 39, and for that purpose, ball-contact portions 40, 41 are formed in the sleeve 39 corresponding to the ball-contact portions 36, 37, respectively.
A ball 4 is placed between these ball contact portions 36, 37, 40, 41.
By interposing 2 ..., The crankshaft 35 is supported in the sleeve 39 to form a unit. In the figure, 43 and 43 are seals.

A taper surface (slope) 44 is formed on the outer peripheral surface of the sleeve 39 of the crankshaft unit 34 on one end side, the taper surface 44 becoming smaller from the outer side to the inner side. The taper surface 31 formed on the inner peripheral surface of is formed so that the inclination angle corresponds to that of the taper surface 44 of the sleeve 39 described above.

On the other end side of the sleeve 39,
A male screw 46 is formed on the inner peripheral surface of the other lug 16b of the hanger portion 10 described above and is screwed with the female screw 33. A lock nut 47 is screwed onto the male screw 46. In addition, spanner holes 49 that are evenly arranged on the circumference are formed on the end surface of the sleeve 39 on the tapered surface 44 side.

In order to assemble the crankshaft unit 34 configured as described above to the lugs 16a and 16b of the hanger portion 10, the side of the crankshaft unit 34 on which the male screw 46 is formed is closer to the other lug 16b than the lug 16a. , The male screw 46 is screwed into the female screw 33 of the other lug 16b, and is screwed into the spanner hole 49 by using an appropriate spanner. After that, the male screw 46 protruding from the other lug 16b
The lock nut 47 is screwed on.

When the crankshaft unit 34 is assembled in this way, since the taper surface 44 of the sleeve 39 and the taper surface 31 of the lug 16a have the same inclination angle, they are fixed by the wedge effect, and therefore screwed. The work of is only on the other side of the lug 16b, and the assembling work is easy and easy.

Further, the threading of the hanger portion 10 is performed at one location on the other lug 16b, and the processing of the tapered surface 31 on one side is easier than the threading, and as a result, the number of processing steps for the hanger portion 10 is reduced. At the same time, even if the hanger portion 10 is thermally deformed due to welding, the tapered surfaces 31 and 44 are aligned to perform automatic centering, and the crankshaft unit 34 is affected by the deformation of the hanger portion 10. And in combination with the unitization of the crankshaft 35,
Set the smooth rotation of the crankshaft 35 as it is,
It can also be maintained.

Further, when the tapered surface 44 is formed on one side of the sleeve 39 of the crankshaft unit 34, the inner ball contact portion 40 can be formed to have a large diameter, and as a result, the ball 42 of the bearing is large in diameter. Any of these can be used, and the bearing becomes strong and stable, and a good rotational tone of the crankshaft 35 can be obtained.

FIG. 4 shows another example. The components having the same functions as those described in FIG. 3 are designated by the same reference numerals and detailed description thereof will be omitted, but the crankshaft unit 34 will be omitted. 4 on the circumference of the tapered surface 44 of the sleeve 39 of
The ridges 50 for preventing rotation are formed at equal positions,
Corresponding to this, a concave groove 51 that engages with the ridge 50 is formed on the circumference of the tapered surface 31 of the lug 16a, and by engaging these, the rotation prevention of the sleeve 39 is positively configured. There is.

On the other hand, the other lug 16b of the hanger portion 10
The inner peripheral surface is formed with a female hole 52 without engraving a female screw, and is formed in such a size that the outer periphery of a flanged mounting nut 53 is inserted into the female hole 52. Reference numeral 54 in the figure is a spring washer.

In the case of such a construction, the protrusion 50 of the tapered surface 44 of the crankshaft unit 34 is engaged with the concave groove 51 of the tapered surface 31 of the lug 16a to prevent the rotation, and the crankshaft unit 34 is rotated from the other lug 16b. A mounting nut 53 with a collar is screwed to the male screw 46 of the unit 34 via a spring washer 54 to attach the crankshaft unit 34 to the other lug 16
Fix by pulling to side b.

According to the second embodiment, in addition to the effect of the embodiment shown in FIG. 3 described above, both lugs 1 of the hanger portion 10 are provided.
Since 6a and 16b have no female thread processing, the number of processing steps is further reduced.

FIG. 5 shows still another example, which is shown in FIG.
Although the taper surface 44 formed on the sleeve 39 is linear in the axial direction, it is formed on the spherical surface 55 in this embodiment.
Corresponding to this, the inner peripheral surface of the lug 16a is also formed into a spherical surface 56, which is the only difference from the embodiment of FIG. Therefore, other components having the same function are designated by the same reference numerals, and detailed description thereof will be omitted. Even with this configuration, it is possible to obtain the same effects as those of the embodiment shown in FIG.

FIG. 6 shows still another example. In this embodiment, the outer peripheral surface of the flanged mounting nut 57 screwed to the sleeve 39 is also formed into a spherical surface 58, and the lug 1 corresponding to this is formed.
The point that the inner peripheral surface of 6b is also formed into a spherical surface 59 is different from the embodiment of FIG.

Therefore, other components having the same function are designated by the same reference numerals, and detailed description thereof will be omitted.

With this structure, one spherical surface 5 is formed.
Since the automatic centering of the crankshaft unit 34 can be easily performed by both 5, 56 and the other spherical surfaces 58, 59, the bearing of the crankshaft 35 does not get out of order, and a smooth rotational tone can be maintained. The other effects similar to those of the embodiment shown in FIG. 5 can be obtained.

FIG. 7 shows still another example. In this embodiment, the tapered surface 60 (a spherical surface is also possible) formed on one end side of the sleeve 39 of the crankshaft unit 34 becomes smaller from the inner side to the outer side. Corresponding to this, a corresponding tapered surface 61 is also formed inside the rug 16b. Note that other components having the same function are denoted by the same reference numerals as those in FIG. 3, and detailed description thereof is omitted. Even with this configuration, the same operational effect as that of FIG. 3 can be obtained.

In the embodiments shown in FIGS. 4, 5 and 6, the rotation preventing means is constituted by the engagement of the convex strip 50 and the concave groove 51. It is also possible to form 55 and 56 in a polygonal shape on the circumference and use this polygonal shape as a means for preventing rotation. Further, in FIG. 3 to FIG. 7, the slope can be configured to be left-right reversed.

[Brief description of drawings]

FIG. 1 is a partial side view of a bicycle.

FIG. 2 is a cross-sectional view showing a conventional hanger portion.

FIG. 3 is a sectional view showing a hanger portion according to the present invention.

FIG. 4 is a sectional view showing a hanger portion of another example.

FIG. 5 is a sectional view showing a hanger portion of another example.

FIG. 6 is a sectional view showing a hanger portion of another example.

FIG. 7 is a cross-sectional view showing a hanger portion of another example.

[Explanation of symbols]

 10 ... Hanger part 16a, 16b ... Ragg 31, 44, 60, 61 ... Tapered surface 33 ... Female screw 34 ... Crankshaft unit 35 ... Crankshaft 39 ... Sleeve 46 ... Male screw 55, 56, 58, 59 ... Spherical surface

Claims (5)

[Claims] 1. A bicycle hanger part structure for mounting a crankshaft unit united by bearing a crankshaft in a sleeve to a hanger part of a bicycle, wherein the outer peripheral surface of the sleeve on one end side of the crankshaft unit. , Forming an inclined surface inclined in the axial direction, forming an inner peripheral surface of the hanger portion corresponding to this to a corresponding inclined surface corresponding to the sleeve inclined surface, and the other end side of the sleeve to the corresponding hanger portion, A structure of a hanger portion of a bicycle screwed in a direction in which the mutual slopes are pressed against each other. 2. A bicycle hanger portion structure for mounting a crankshaft unit united by bearing a crankshaft in a sleeve to a bicycle hanger portion, wherein the sleeve outer peripheral surface on one end side of the crankshaft unit. , A slope that becomes smaller from the inner side to the outer side is formed, and the inner peripheral surface of the hanger portion corresponding to this is formed as a corresponding slope surface corresponding to the above-mentioned sleeve slope surface, and the other end side of the sleeve is formed at the corresponding hanger A hanger portion structure for a bicycle, in which the slopes are screwed to each other in a direction of being pressed against each other. 3. A bicycle hanger structure for mounting a crankshaft unit, which is unitized by bearing a crankshaft in a sleeve, to a bicycle hanger part, wherein the crankshaft unit has an outer peripheral surface on one end side thereof. , A slope that becomes smaller from the outer side to the inner side is formed, a male thread for fastening is engraved on the other end side of the sleeve, and a mounting nut engraved with a corresponding female thread is provided, and A slope that becomes smaller from the outside to the inside is formed on the outer peripheral surface of the mounting nut, and the inner peripheral surface of the hanger that corresponds to the mounting nut is formed on the corresponding slope that corresponds to the slope of the mounting nut. A bicycle hanger structure in which the male threads of the sleeve are screwed to fasten the mutual slopes. 4. The hanger structure for a bicycle according to claim 1, 2 or 3, wherein the sloped surface of the sleeve is a linear tapered surface. 5. The hanger structure for a bicycle according to claim 1, 2 or 3, wherein the inclined surface of the sleeve is formed into a spherical surface.