JPH05319349A - Bowl-less hanger set for bicycle - Google Patents

Abstract

PURPOSE:To provide the ball-less hanger set for a bicycle, which can be lightened in weight, corrosion resistance and the abrasion resistance of which has been improved, and in which the oil supply is not required and a friction coefficient is reduced to obtain the soft and smooth rotation. CONSTITUTION:The outer peripheral surface of a ring-like body 2 for left side of a crankshaft made of ceramics is brought into shidable contact with the inner peripheral surface of a ring-like body 4 for a left bowl made of ceramics, and the outer peripheral surface of a ring-like body 3 for right side of the crankshaft made of ceramics is brought into slidable contact with the inner peripheral surface of a ring-like body 5 for a right bowl made of ceramics respectively to support a crankshaft 1 made of metal freely to turn. In comparison with the conventional hanger set for a bicycle, in which a steel ball is used for bearing and a right and a left bowls made of steel are used, a hanger set for a bicycle is lightened in weight at about 10-20%. Since a bearing part is made of ceramics, the corrosion resistance and the abrasion resistance are improved, and the oil supply is eliminated and the friction coefficient is reduced to obtain the soft and smooth rotation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballless hanger set for a bicycle.

[0002]

2. Description of the Related Art A conventional bicycle hanger set will be described with reference to FIG. 6. Reference numeral 11 is a steel crankshaft (cottered crankshaft), and the crankshaft 11 has a cotterless, single crank, in addition to a cottered one. Is also used. 1
3 is a steel hanger lug, 12 is a steel right bowl that is screwed into the right end of the hanger lug 13, 15 is a steel left bowl that is screwed into the left end of the hanger lug 3, 14 is a stop nut, and 16 is a ball bearing ( Steel ball), the ball bearing 16 is provided between the crankshaft 11 and the right bowl 12, and
The crankshaft 11 is rotatably supported by being interposed between the ball bearings of the crankshaft 11 and the left bowl 15.

The hanger set is the center of the bicycle drive unit, and when the pedal is turned, the crankshaft 11 rotates, and the rotation is transmitted to the rear wheel of the bicycle, so that the bicycle runs.

[0004]

In the conventional bicycle hanger set shown in FIG. 6, between the ball bearings of the steel crankshaft 11 and the steel right bowl 12, and the steel crankshaft 11
The ball bearing (steel ball) 16 is interposed between the ball bearings of the steel and the steel left bowl 15, and the crankshaft 11 is rotatably supported. Is made of steel, the weight of the hanger set is heavy, and the corrosion resistance and wear resistance are low. Further, there has been a problem that lubrication such as grease is required for the bearing portion, and if the lubrication is neglected, a friction noise is generated during rotation.

The present invention is proposed in view of the above problems, and the object thereof is to reduce the weight and improve the corrosion resistance and wear resistance. Another point is to provide a bicycle hanger set that does not require refueling, has a low coefficient of friction, and provides soft and smooth rotation.

[0006]

In order to achieve the above object, a bicycle hanger set of the present invention has a ceramic crankshaft left ring-shaped body on the left end side of a metal crankshaft and made of ceramics. Of the crankshaft on the right side of the metal crankshaft, fix the left ring made of ceramics inside the left bowl, and place the ring made of ceramics on the right bowl. Fix each inside the metal right bowl and slidably contact the crankshaft left side ring body and the crankshaft right side ring body with the left bowl ring body and the right bowl ring body. Thus, the crankshaft is rotatably supported.

[0007]

In the ballless hanger set for a bicycle of the present invention, as described above, the outer peripheral surface of the ceramic crankshaft left side ring-shaped body is set on the inner peripheral surface of the ceramic left bowl ring-shaped body. The metal crankshaft is rotatably supported by slidably contacting the outer peripheral surface of the shaft right ring with the inner surface of the ceramic right bowl ring, respectively. Compared to the conventional bicycle hanger set that uses steel balls for the left and right arms, the weight is reduced by about 10 to 20%. Moreover, since the bearing portion is made of ceramics, corrosion resistance and wear resistance are improved. Further, since the bearing portion is made of ceramics as described above, lubrication is unnecessary, the friction coefficient is reduced, and soft and smooth rotation is performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a bicycle ballless hanger set of the present invention will be described with reference to one embodiment shown in FIGS. 1 to 5. 1 is a steel crankshaft (cotterless crankshaft), and 2 is a ceramic crankshaft. Left side ring-shaped body, 3 is a ceramic crankshaft right side ring-shaped body, 4 is a ceramic left bowl ring-shaped body, 5 is a ceramic right bowl ring-shaped body, 6 is a steel left bowl, No. 7 is a steel right wing.

In the above ballless hanger set for a bicycle, a ceramic crankshaft left ring-shaped body 2 is provided on the left end side of a steel crankshaft 1, and a ceramic crankshaft right ring-shaped body 3 is made of a steel crank. The shaft 1 is fixed to the right end side by adhesion or joining, and the ceramic left bowl ring 4 is placed in the steel left bowl 6 and the ceramic right bowl ring 5 is made in the steel right bowl. 7 are fixed to each other by adhesion or bonding, and the crankshaft left side ring-shaped body 2 and the crankshaft right side ring-shaped body 3 are fixed.
Is slidably contacted with the ring-shaped body 4 for the left bowl and the ring-shaped body 5 for the right bowl to rotatably support the crankshaft 1.

The ceramic ring-shaped bodies 2 to 5 are
For example, 80% alumina powder and 20% zirconia powder are mixed at a mixing ratio of cast molding and CIP (cold isostatic pressing) and then sintered at 1600 ° C.
The ceramic molded body is manufactured in consideration of shrinkage during polishing and polishing allowance. The surface roughness of the polishing process was 3 μm or less, and the clearance between the crankshaft 1 and the left and right frames 6, 7 was 30 μm or less.

2 and 3 show a ceramic ring-shaped body 2.
4 to 5 show a composite of a ceramic left bowl ring 4 and a steel left bowl 6, and a composite of a ceramic right bowl ring 5 and a steel right bowl 7. Shows the body. In the ballless hanger set for a bicycle of the present invention, the outer peripheral surface of the ceramic left-hand ring-shaped crankshaft 2 is provided on the inner peripheral surface of the left ceramic ring-shaped ring 4, and the right-hand ceramic crankshaft ring. Form 3
The outer peripheral surface of the metal ring is slidably brought into contact with the inner peripheral surface of the ceramic right bowl ring body 5, and the metal crankshaft 1 is rotatably supported. Compared to the conventional bicycle hanger set that uses each of the alligator made of steel, the weight is reduced by about 10 to 20%.

Further, since the bearing portion is made of ceramics, the corrosion resistance and wear resistance are improved. Further, since the bearing portion is made of ceramics as described above, lubrication is unnecessary, the friction coefficient is reduced, and soft and smooth rotation is performed. The present invention can be applied to other bearings, for example, bearings of headsets, bearings of front and rear wheel spindles, and the like.

[0013]

As described above, the ballless hanger set for a bicycle according to the present invention has the outer peripheral surface of the ceramic left crank ring-shaped body on the inner peripheral surface of the ceramic left bowl ring-shaped body. The outer peripheral surface of the ring-shaped body for the right side of the crankshaft is slidably brought into contact with the inner peripheral surface of the ring-shaped body 5 for the right bowl made of ceramics to rotatably support the metal crankshaft, 10-20% compared to the conventional bicycle hanger set that uses steel balls for bearings and steel ones for the left and right arms
It can be made lighter.

Further, since the bearing portion is made of ceramics, the corrosion resistance and wear resistance can be improved. Further, since the bearing portion is made of ceramics as described above, it is possible to eliminate the need for oil supply, reduce the friction coefficient, and obtain soft and smooth rotation.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a ballless hanger set for a bicycle according to the present invention.

FIG. 2 is a vertical cross-sectional side view showing a crankshaft left side ring-shaped body and a crankshaft right side ring-shaped body of the same hanger set.

FIG. 3 is a vertical cross-sectional side view showing a ring-shaped body for a left bowl and a ring-shaped body for a right bowl of the same hanger set.

FIG. 4 is a vertical cross-sectional side view showing a composite of the left bowl ring and the left bowl of the same hanger set.

FIG. 5 is a vertical cross-sectional side view showing a composite of the right bowl ring and the right bowl of the same hanger set.

FIG. 6 is a vertical sectional side view showing a conventional bicycle hanger set.

[Explanation of symbols]

 1 Metal Crank Shaft 2 Ceramics Crank Shaft Left Ring 3 Ceramics Crank Shaft Right Ring 4 Ceramics Left Hand Ring 5 Ceramics Right Hand Ring 6 Metal Left Hand 7 Metal Right bowl

Claims (1)

[Claims] 1. A ceramic crankshaft left ring-shaped body is fixed to the left end side of a metal crankshaft, and a ceramic crankshaft right ring-shaped body is fixed to the right end side of a metal crankshaft. , The ceramic left bowl ring is fixed in the metal left bowl, and the ceramic right bowl ring is fixed in the metal right bowl, and the crankshaft left ring and the crank are fixed. A ballless hanger for a bicycle, characterized in that the crankshaft is rotatably supported by slidably contacting the ring-shaped body for the shaft right side with the ring-shaped body for the left bowl and the ring-shaped body for the right bowl. set.