JPH08258779A - Hunger for bicycle - Google Patents

Abstract

PURPOSE: To provide a hanger for a bicycle which is so constituted as to a chain line is easily adjusted even when the boss part of a cotterless crank arm to fix a chain sprocket to a taper angle shaft at one end is a hanger lug to pivotally support a crank shaft fastened by a fastening nut. CONSTITUTION: The boss part 12 of a cotterless crank arm 11 to fix a chain sprocket 13 to a taper angle shaft 9 at one end is a hanger lug 2 disposed to the lower end of a frame 1 to pivotally support a crank shaft 4 fastened by means of a fastening nut 10. The outer peripheral cylinder 5 of a unit hanger 3 where a bearing consisting of a ball 6 and an outer peripheral cylinder 5 are brought into a unit and integrally disposed in the proper position of the crank shaft 4 is slidably fitted in the inner peripheral surface of the cylinder of the hunger lug 2, and the position in an axial direction of the unit hanger 3 based on the hunger lug 2 is adjustably fastened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanger lug which is arranged at the lower end of a frame and which supports a crank shaft of a pedal crank of a bicycle.

[0002]

2. Description of the Related Art Hitherto, various types of hanger lugs have been adopted for supporting a crankshaft of a pedal crank of a bicycle. One commonly used one is shown in FIG. 6, for example. Explaining this, the chain sprocket 43 is attached to the taper angle shaft 39 at one end.
The boss portion of the cotterless crank arm 41 to which is fixed is tightened by the tightening nut 40. On the other hand, a crank shaft 34 is pivotally supported by a hanger lug 32 arranged at the lower end of the frame 31. In order to pivotally support the crankshaft 34 on the hanger lug 32, a large number of balls 36 are held from the outside by a pair of annular projections 38 provided in the intermediate portion of the crankshaft 34 with grease or the like, and then the hanger The large number of balls 36 are pressed and mounted by the ball pressing bearings 37 that are screwed into the screw portions 44 screwed on the inner circumferences of both ends of the middle pipe (outer peripheral cylinder) 35 fixed to the inner circumference of the lug 32 by welding or the like. . However, the inner pipe 35 of the ball bearing 37
When a large number of balls 36 are pressed by screwing to form a bearing, depending on the degree of screwing of the ball pushing bearing 37, the bearing may be too loose and play, or may be too tight and the pedal may be heavy. It also became. Further, when the boss portion of the cotterless crank arm 41 to which the chain sprocket 43 is fixed is tightened with the tightening nut 40 on the taper angle shaft 39 formed at one end of the crank shaft 34, the tightening nut 40 is screwed. The degree of penetration of the boss portion of the cotterless crank arm 41 into the taper angle shaft 39 is not determined depending on the degree of fit, that is, the degree of tightening torque. That is, there is a possibility that the distance W between the center line m of the hanger lug 32 and the chain line 1 of the chain sprocket 43 may be misaligned and cannot be specified. In addition, it takes time and skill to hold the large number of balls 36 on the crankshaft 34 with grease or the like and press them with the ball bearings 37 to screw them together, and there is a risk that the balls 36 will be scattered during assembly. It was extremely difficult to handle.

In view of the above, a unit hanger has been proposed in which the ball 36 and the middle pipe 35 are unitized as a bearing and integrally arranged on the crankshaft 34 as shown in FIG. 1357). In the second conventional example, the ball 36 is housed and positioned in an annular groove 48 formed in an appropriate portion of the crankshaft 34.
An inner pipe (outer peripheral cylinder) 35 that receives these balls 36 is fitted to the outer periphery of the unit hanger 33 to integrally form the unit hanger 33.
It is what As a result, the hanger integrally formed with the crankshaft 34 is attached to the hanger lug 32 by the screw rings 47 screwed onto the inner circumferences of both ends of the hanger lug 32.
Be assembled into. The engaging protrusions 49 at the inner ends of the screw rings 47 are engaged with the corresponding engaging recesses of the outer peripheral tube 35 of the unit hanger 33, and the respective members are axially positioned. As a result, although various problems at the time of assembly as in the conventional example of FIG. 6 can be solved, the boss portion of the cotterless crank arm having the chain sprocket fixed is still tightened to the taper angle shaft 39 at one end of the crank shaft 34. No measures were taken to prevent the chain line from slipping when tightening with the attached nut. Moreover, the accuracy of the square hole on the crank arm side corresponding to the taper angle shaft 39 of the crank shaft is also required. In addition, the chain line may change depending on the combination of the crank arm 41 and the crank shaft 34. That is, when the crank arm 41 is changed, the crank shaft 34 also needs to be changed, which requires a large number of types of crank shafts, which is extremely uneconomical.

Therefore, as the one capable of adjusting the chain line, a one as shown in FIG. 8 has been proposed (Japanese Utility Model Publication No. 57-53747). This third conventional example is
Similar to the second prior art example, the outer peripheral cylinder 35 of the unit hanger 33 integrally arranged with the crankshaft 34 is provided with locking grooves 51A and 51B which are axially offset from each other. A tightening bolt 46 for tightening the unit hanger 33 to the hanger lug 32 is inserted and locked in the stop groove, for example, 51B, orthogonal to the axial direction. In this state, the crank arms 41 are positioned and fixed by the cotter pins 50 on both ends of the crank shaft 34. Thus, the distance W from the center line m of the hanger lug 32 of the chain line 1 of the chain sprocket 43 is determined.
Next, when it is desired to change the distance W from the center line m of the hanger lug 32 to the chain line 1 for matching with the multi-speed gear of the bicycle, the tightening bolt 46 is removed and the unit hanger 33 is used. The outer peripheral cylinder 35 is rotated by half and the locking groove 51A is positioned downward, so that the unit hanger 33 with respect to the hanger lug 32 is
Of the crankshaft 34 or by removing the crank arms 41 from both ends of the crankshaft 34 and replacing the left and right of the crankshaft 34 and the unit hanger 33 integrally provided with the crankshaft 34. The position of 33 is changed.
However, even in this conventional example, the crankshaft 34
The positioning of the crank arm 41 with respect to the is uniquely determined by the locking of the cotter pin 50, only a few kinds of chain lines can be changed, and fine adjustment and adjustment of the chain line are not possible. It was necessary to prepare the axis. Moreover, it is impossible to correct and adjust the deviation of the chain line due to manufacturing error.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention solves the above-mentioned problems of the prior art, and a crank in which a boss portion of a cotterless crank arm having a chain sprocket fixed to a taper angle shaft at one end is tightened by a tightening nut. (EN) Provided is a bicycle hanger capable of easily adjusting a chain line even with a hanger lug that supports a shaft.

[0006]

Therefore, according to the present invention, the boss portion of the cotterless crank arm having the chain sprocket fixed to the taper angle shaft at one end is attached to the lower end of the frame for pivotally supporting the crank shaft tightened by the tightening nut. A hanger lug to be arranged, wherein a bearing composed of a ball and an outer peripheral cylinder is unitized and integrally arranged on an inner peripheral surface of a cylinder of the hanger lug at an appropriate position of the crankshaft. By slidingly fitting the outer peripheral cylinder,
It is characterized in that the axial position of the unit hanger with respect to the hanger lug is tightened so as to be adjustable, and this is a means for solving the problem. Further, in the present invention, an axial split groove is formed in a lower portion of the hanger lug, and the unit hanger is secured by tightening screw cylinders and fastening bolts arranged at a plurality of positions facing each other across the split groove. The arranged crankshaft may be pivotally supported on a hanger lug, or an axial split groove may be formed in the lower part of the hanger lug, and separate tightening bands may be wound around the outer periphery of both ends of the hanger lug. However, the crankshaft having the unit hanger may be pivotally supported on the hanger lug by tightening a screw cylinder and tightening bolts provided at both ends of the tightening band. Further, in the present invention, the hanger lug is divided into upper and lower parts to form a flanged semi-cylindrical upper and lower hanger lugs, and the opposing flanges are respectively arranged with the unit hangers by tightening tightening bolts and nuts. The crankshaft may be supported on the hanger lug,
The crankshaft in which the unit hanger is disposed may be pivotally supported on the hanger lug by screwing a set screw that presses against the outer peripheral cylinder of the unit hanger at an appropriate position of the hanger lug.

[0007]

By the means described above, the outer peripheral cylinder 5 of the unit hanger 3 in which the bearing composed of the ball 6 and the outer peripheral cylinder 5 is unitized and integrally disposed at an appropriate position of the crankshaft 4 is attached to the metal sheet 14. And the like, and is slidably fitted to the inner peripheral surface of the cylinder of the hanger lug 2. On the other hand, the chain sprocket 13 is attached to the taper angle shaft 9 at one end of the crank shaft 4.
Boss portion 12 of the cotterless crank arm 11 that fixes the
Is tightened by the tightening nut 10, and similarly the crank arm is tightened on the other end of the crankshaft 4. Depending on the degree of screwing of the tightening nut 10, that is, the tightening torque, the degree of penetration of the boss portion of the cotterless crank arm 11 into the tapered angular shaft 9, that is, the center line m of the hanger lug 2 and the chain of the chain sprocket 13. Although the distance W from the line 1 is not fixed, the cotterless crank arm 11 to which the chain sprocket 13 is fixed is tightened to the crankshaft 4 and the unit hanger 3
After sliding the hanger lug 2 axially, the hanger lug 2 is tightened by tightening the screw cylinders 17 and the tightening bolts 16 arranged at a plurality of positions that are opposed to each other across the axial split groove 15 of the hanger lug 2. The distance W between the center line m and the chain line 1 of the chain sprocket 13 can be adjusted to an appropriate value very easily. That is, a cotter pin insertion hole or the like is not required, and a relatively strong cotterless crank arm 11 that transmits a driving force and a unit hanger 3 that is easy to assemble by using a taper angle shaft are used. By simply preparing different types of crankshafts, fine and precise fine adjustment of the chain line is possible, and a simple combination has brought about remarkable effects not seen in conventional examples. . In addition, the cylindrical inner peripheral surface of the hanger lug 2 into which the outer peripheral cylinder 5 of the unit hanger 3 is slidably fitted can be easily manufactured without the need to engrave screws unlike the conventional one.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a bicycle hanger of the present invention. In the present invention, a large number of balls 6 are provided in annular grooves 8 and 8 formed at appropriate positions in the middle of the crankshaft 4. , 6 are housed, and a bearing composed of an outer peripheral cylinder 5 installed on the outer periphery of these balls 6, 6 is unitized and integrally disposed, and a unit hanger 3 is adopted. Reference numeral 7 indicates a seal. In this way, the unit hanger 3 in which the bearing is unitized and integrally arranged on the crankshaft 4 has its outer peripheral cylinder 5 mounted on the inner peripheral surface of the cylinder of the hanger lug 2 arranged at the lower end of the frame 1. The seat 14 and the like are slidably fitted together. Next, the boss portion 12 of the cotterless crank arm 11 having the chain sprocket 13 fixed to the taper angle shaft 9 at one end of the crankshaft 4 is tightened by the tightening nut 10, and the crank arm having no chain sprocket 13 at the other end is similar. To be tightened.

As shown in FIG. 2, a split groove 15 is formed in the lower portion of the hanger lug 2 in the axial direction, and a screw cylinder 17 and a tightening bolt 16 are provided at a plurality of positions across the split groove 15 and facing each other. And the screw cylinder 17 and the tightening bolt 16 are provided.
By tightening and, the crankshaft having the unit hanger is pivotally supported on the hanger lug. Thus, when there is a manufacturing error in the accuracy of the square hole on the crank arm 11 side corresponding to the taper angle shaft 39 of the crank shaft 4, or depending on the screwing degree of the tightening nut 10, that is, the tightening torque. The degree of penetration of the boss portion of the cotterless crank arm 11 into the taper angle shaft 9, that is, the distance W between the center line m of the hanger lug 2 and the chain line 1 of the chain sprocket 13 may not be determined. According to the invention, the unit hanger 3 is slid in the axial direction while the cotterless crank arm 11 to which the chain sprocket 13 is fixed is tightened to the crankshaft 4, and then the hanger lug 2 is moved.
Tighten the screw cylinder 17 and the tightening bolt 16 arranged at a plurality of positions that are opposed to each other across the axially divided groove 15 in the lower part of
Center line m of hanger lug 2 and chain sprocket 13
The distance W between the chain line 1 and the chain line 1 can be adjusted to an appropriate value very easily. That is, a cotter pin insertion hole or the like is not required, and a relatively strong cotterless crank arm 11 that transmits a driving force and a unit hanger 3 that is easy to assemble by using a taper angle shaft are used. By simply preparing different types of crankshafts, fine and precise fine adjustment of the chain line is possible, and a simple combination has brought about remarkable effects not seen in conventional examples. . Moreover, the cylindrical inner peripheral surface of the hanger lug 2 into which the outer peripheral cylinder 5 of the unit hanger 3 is slidably fitted can be easily manufactured without the need to engrave screws as in the conventional one.

FIG. 3 shows a second embodiment of the present invention.
In this embodiment, similar to the first embodiment, an axial dividing groove (not shown in FIG. 3) is formed in the lower portion of the hanger lug 2 and the outer periphery of both ends of the hanger lug 2 is formed. Separately tightening bands 18A, 18B are wound around the unit, and the unit hanger 3 is arranged by tightening the screw cylinders 17 and the tightening bolts 16 arranged at both ends of the tightening bands 18A, 18B. The crankshaft 4 is pivotally supported on the hanger lug 2, and in the present embodiment, the tightening bands 18A and 18B having the screw cylinder 17 and the tightening bolt 16 at both ends are adopted. It is not necessary to provide the screw cylinder 17 for tightening and tightening the unit hanger 3 and the tightening bolt 16 across the split groove of the hanger lug 2, and the structure of the hanger lug 2 is simplified.

FIG. 4 shows a third embodiment of the present invention.
In the present embodiment, the hanger lug 2 is divided into upper and lower parts instead of the axial dividing groove 16 provided in the lower part of the hanger lug 2 of the previous two examples, and the upper and lower half cylinders with the flanges 2A1, 2A2, 2B1 and 2B2 are arranged. The crankshaft 4 in which the unit hangers 3 are arranged by constituting the hanger lugs 2A, 2B, and tightening the opposing flanges 2A1, 2B1, 2A2, 2B2 with tightening bolts 16, 16 and nuts 17, 17, respectively. Is pivotally supported on the hanger lug 2. In the present embodiment, a pair of crank arms can be fastened and attached to both ends of the crank shaft 4 in advance. The unit hanger 3 of the above is applied from below the upper hanger lug 2A, and the lower hanger lug 2B is applied from below the unit hanger 3 so as to face the joint surface thereof. Flange 2A1 and 2B1 and 2A
The unit hangers 3 are axially supported on the hanger lugs 2 by tightening the fastening bolts 16 and 17 on 2 and 2B2.

FIG. 5 shows a fourth embodiment of the present invention.
In the present embodiment, the unit hanger 3 is pivotally supported on the hanger lug 2 by screwing a set screw 19 which is pressed against the outer peripheral cylinder 5 of the unit hanger 3 at an appropriate position of the hanger lug 2. In the embodiment, the hanger lug 2 into which the outer peripheral cylinder 5 of the unit hanger 3 is slidably fitted.
The inner peripheral surface of the cylinder is sized to fit the outer peripheral cylinder 5 of the unit hanger 3 through a metal sheet or the like without any excess or deficiency.
If necessary, a plurality of setscrews 19 that are screwed together may be screwed at appropriate positions to press the outer peripheral cylinder 5 of the unit hanger 3 under pressure, so that a split groove may be provided on the hanger lug 2. Since the split lug is not used, the configuration is simple.

Although the embodiments have been described above, the shape of the unit hanger, the shape of the hanger lug, the fixing shape of the chain sprocket and the crank arm, the shape and position of the split groove, and the metal sheet are within the scope of the present invention. With or without,
It goes without saying that the screw cylinder and the tightening bolt can be installed appropriately.

[0014]

As described above in detail, according to the present invention, the boss portion of the cotterless crank arm is attached to the taper angle shaft depending on the screwing degree of the tightening nut, that is, the tightening torque. Although the degree of penetration, that is, the distance between the center line of the hanger lug and the chain line of the chain sprocket is not fixed, slide the unit hanger in the axial direction while tightening the cotterless crank arm fixing the chain sprocket to the crankshaft. After moving it, tighten the screw cylinders and tightening bolts that are arranged at a plurality of opposing positions across the axial split groove in the lower part of the hanger lug to tighten the center line of the hanger lug and the chain line of the chain sprocket. The spacing between can be very easily adjusted to the proper one. In other words, a cotter pin insertion hole etc. is unnecessary, a relatively strong cotterless crank arm that transmits a large driving force by using a taper angle shaft, and a unit hanger that is easy to assemble are used. By simply preparing the crankshaft, fine adjustment of the chain line can be performed with high precision, and a simple combination brings about a remarkable effect not seen in the conventional example. Moreover, the cylindrical inner peripheral surface of the hanger lug into which the outer peripheral cylinder of the unit hanger is slidably fitted can be easily manufactured without the need to engrave screws unlike the conventional one.

Further, if a tightening band having a screw cylinder and a tightening bolt at both ends is adopted so that the unit hanger is tightened and tightened in the hanger lug, the screw cylinder and the tightening bolt are separated from each other by a split groove of the hanger lug. The structure of the hanger lug is simplified because there is no need to provide it across Furthermore, instead of the axial split groove, the hanger lug is divided into upper and lower parts to form a flanged semi-cylindrical upper and lower hanger lugs, and these opposing flanges are tightened by tightening bolts and nuts, respectively.
In the case where the unit hanger is pivotally supported by the hanger lug, it becomes possible to fasten and fasten a pair of crank arms to both ends of the crankshaft in advance. Furthermore, in the case where the unit hanger is pivotally supported on the hanger lug by screwing a set screw that presses against the outer peripheral cylinder of the unit hanger at an appropriate position of the hanger lug, after setting the proper chain line, the hanger lug is set. Since it is only necessary to screw a set screw which is arranged and screwed at an appropriate position into pressure contact with the outer peripheral tube of the unit hanger, a split groove is not provided in the hanger lug or a divided lug is provided, so that the configuration is simple. Becomes

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of a bicycle hanger of the present invention.

FIG. 2 is a partial cross-sectional view taken along arrow A of FIG.

FIG. 3 is a partial sectional view showing a second embodiment of the bicycle hanger of the present invention.

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

FIG. 5 is a partial sectional view showing a fourth embodiment of the bicycle hanger of the present invention.

FIG. 6 is a partial cross-sectional view showing a first conventional example of a bicycle hanger.

FIG. 7 is a cross-sectional view showing a second conventional example of a bicycle hanger.

FIG. 8 is a sectional view showing a third conventional example of a bicycle hanger.

[Explanation of symbols]

 1 frame 2 hanger lug 3 unit hanger 4 crankshaft 5 outer cylinder 6 ball 9 taper angle shaft 10 tightening nut 11 crank arm 12 boss 13 chain sprocket 15 split groove 16 tightening bolt 17 screw cylinder m chainline l hanger lug center line

Claims (5)

[Claims] 1. A hanger lug arranged at a lower end of a frame, which has a boss portion of a cotterless crank arm having a chain sprocket fixed to a taper angle shaft at one end, and which is provided at a lower end of a frame that pivotally supports the crank shaft tightened by a tightening nut. The outer peripheral cylinder of a unit hanger in which a bearing made up of a ball and an outer peripheral cylinder is unitarily arranged at an appropriate position of the crankshaft and integrally disposed on the inner peripheral surface of the cylinder of the hanger lug is slidably fitted. The bicycle hanger is characterized in that the axial position of the unit hanger with respect to the hanger lug is adjusted so as to be adjustable. 2. The unit hanger is formed by forming a split groove in the lower portion of the hanger lug in the axial direction and tightening screw bolts and tightening bolts arranged at a plurality of positions facing each other across the split groove. The bicycle hanger according to claim 1, wherein the provided crankshaft is pivotally supported on a hanger lug. 3. A split groove is formed in the lower part of the hanger lug in the axial direction, and separate tightening bands are wound around the outer circumferences of both ends of the hanger lug, and the tightening bands are arranged at both ends of the tightening band. The bicycle hanger according to claim 1, wherein the crankshaft, on which the unit hanger is disposed, is pivotally supported on a hanger lug by tightening a screw cylinder and a tightening bolt. 4. The crank in which the hanger lug is divided into upper and lower parts to form a flanged semi-cylindrical upper and lower hanger lugs, and the unit hangers are arranged by tightening tightening bolts and nuts on the opposing flanges, respectively. The shaft is rotatably supported by the hanger lug.
Bicycle hanger described in. 5. The crankshaft, on which the unit hanger is disposed, is pivotally supported on the hanger lug by screwing a set screw that presses against an outer peripheral cylinder of the unit hanger at an appropriate position of the hanger lug. The bicycle hanger according to claim 1.