JPH0725201A - Spoke type wheel - Google Patents

Abstract

PURPOSE:To improve the strength of each spoke and reduce the weight of the whole of a spoke type wheel by reducing the dimension of a hub body, as to the spoke type wheel which is constituted so that spokes are laid between a hub body which is externally fitted in a turnable manner on an axle and a rim. CONSTITUTION:Each spoke 3 is constituted by providing an engagement head part 34 at one edge of a rectilinear shaft part, and on the other hub body 2, a bowl part 21 whose edge part is opened and is constituted so that a rolling bearing unit 5 is accommodated at both the edge parts is formed. Spoke holes 44 are penetration-formed on the bowl part 21, and the inner circumferential diameter at the opened edge of the bowl part 21 is set to the dimension for the insertion of the rectilinear spoke 3 to the spoke hole 24 from the inner peripheral side of the bowl part 21, and at the spoke hole formation part on the inner peripheral surface of the bowl part 21, a recessed part 26 for accommodating the engagement head part 34 between the outer periphery of the rolling bearing unit 5 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spoke type wheel such as a bicycle wheel.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventional spoke type bicycle wheel has a hub cylinder (20) at both ends of a hub body (2) which is rotatably fitted around an axle (4). Edges of the plate-shaped flange (F) (F) and the rim that project from the vicinity to the outer peripheral side
A large number of spokes (3) and (3) are stretched between (1) and (1).

The spoke (3) used for the bicycle wheel has a bending piece (30) at one end and a screw portion for screwing a nipple at the other end. At the time of assembling this bicycle wheel, a plurality of spoke holes (24) (2) formed through the peripheral edge of the flange (F) in a direction substantially parallel to the axis of the hub (2).
Insert these spokes (3) and (3) into (4), and with the posture where the bending piece (30) of each spoke (3) penetrates the spoke hole (24), rim the screw part with a nipple ( Screw it to the spoke hole of 1). As a result, the locking head (34) formed at the tip of the bending piece (30) engages with the spoke hole (24) in a retaining state, and each spoke (3) is attached to the flange (F) and the rim.
It will be installed between (1).

By the way, in this bicycle wheel, a hub cylinder is used.
The size of the flange (F) protruding from the (20) to the outer peripheral side depends on the number of spokes (3) and (3) connected to the flange (F), and the workability when assembling the spokes (3) and (3). It is set in accordance with the relationship with, and is relatively large in the above-mentioned conventional one. In this type of bicycle wheel, the fluctuation of the tension acting on each spoke (3) is repeated during its running, and the bending proximal end of the bending piece (30) is subjected to bending stress and shear stress due to this tension fluctuation. The fluctuation is repeated, and the fatigue fracture is likely to occur due to the repeated stress.

Therefore, in order to secure the wheel strength, the hub body is
It is necessary to reduce the stress acting on each one of the spokes (3) and (3) stretched between the (2) and the rim (1). Therefore, it is necessary to increase the number of attachments. From the flange
The diameter of (F) becomes larger. As a result, the hub body
(2) becomes large, and the number of spokes (3) and (3) increases, making it difficult to reduce the weight of the entire wheel.

[0006]

The present invention has been made in view of the above-mentioned problems, and it is "a hub body rotatably fitted on an axle (4).
In the spoke type wheel in which the spokes (3) and (3) are stretched between the (2) and the rim (1), the strength of each spoke (3) is improved and the hub body (2) is reduced in size. It is a technical subject to reduce the weight of the spoke type wheel as a whole.

[0007]

[Technical Means] The technical means of the present invention taken to solve the above technical problem is that "each spoke (3) is provided with a locking head (34) at one end of a linear shaft. The other hub body (2) has rolling bearing units (5) (5) at both ends.
To form an open-ended bowl (21) (21), and through which spoke holes (24) (24) are formed to penetrate the bowl (21) (21). ) Of the open end is set to a size such that the linear spokes (3) can be inserted from the inner peripheral side of the bowl portion (21) toward the spoke holes (24). ), The rolling bearing unit (5)
A recess (26) for accommodating the locking head (34) with the outer periphery of
Is formed ”.

[0008]

The above technical problems of the present invention operate as follows. In this case, when assembling the spokes (3) (3), each of the bowl parts (21) is placed in the spoke holes (24) (24) provided in the left and right bowl parts (21) (21) of the hub body (2). ), Insert the linear shaft of each spoke (3) that is tilted outward from the inside of the open end of the hub (2) from the direction perpendicular to the axis of the hub (2).
It is assumed that the locking head portion (34) is housed in the recessed portion (26). Then, after all the spokes (3) have been inserted, the rolling bearing unit (5) is housed in each bowl (21) from the outside, and after this, the end of each spoke (3) on the rim (1) side. Secure the part to the rim (1) with a nipple.

In this case, since the engaging head portion (34) is directly engaged with the relatively small bowl portion (21), the spokes
(3) The total number of (3) is reduced, but when a tensile force acts on each spoke spoke (3) during running, the shaft and the locking head (34) are linear. Therefore, only the tensile stress mainly acts on these boundaries, so that the tension that one spoke (3) can bear can be increased.

Therefore, even if the total number of spokes (3) and (3) is small, the wheel has sufficient wheel strength.

[0011]

[Effects] The present invention having the above-described structure has the following unique effects. Even if the diameter of the bowl portion (21) of the hub body (2) can be made relatively small and the total number of spokes (3) (3) is reduced,
Since the wheel has sufficient strength, it is possible to reduce the weight of the spoke wheel as a whole.

When assembling each spoke (3),
Since the locking head (34) is set in the recess (26) only by linearly inserting the linear shaft into the spoke hole (24), the base end of the bending piece (30) is set. The workability of assembling the spokes (3) is improved as compared with the conventional example in which the posture needs to be changed in the right angle direction when passing through the spoke holes (24).

[0013]

Embodiments of the present invention will be described below with reference to FIGS. [Embodiment 1] This embodiment 1 is, as shown in FIG.
The rolling bearing unit (5) interposed between the (4) and the bowl (21) (21) of the hub body (2) is fitted with the outer ring (51) and the axle which are tightly fitted in the bowl (21). A spoke type wheel for a bicycle, which is composed of an inner ring (52) tightly fitted to (4) and steel balls (B) and (B) sandwiched between them.

The axle (4) comprises a shaft main body (4a) having substantially the same length as the hub body (2) and a screw which is connected to both ends of the shaft main body (4a) and serves as a connecting portion with a frame or the like. It consists of the shaft parts (4b) and (4b). And, a certain range of both ends of the shaft main body part (4a) has a shaft part (42) for fitting a rolling bearing unit (5) described later.
The large diameter portions (41) and (41) are formed so as to project inside thereof.

The hub body (2) is composed of the shaft main body portion.
The hub body is set to (4a) with a diameter that allows it to be fitted with a margin.
Both ends of (2) are bowls with a curved outer circumference (21) (21)
Has become. The inner peripheral surface of the open end of each bowl portion (21) is an annular portion (2a) formed on the inner peripheral surface parallel to the axis of the hub body (2). The bearing unit (5) is fitted.

Further, the annular portion (2a) is a spoke (described later).
(3) A plurality of spoke holes (24) are formed at a predetermined pitch in the circumferential direction in the vicinity of the peripheral edge of the annular portion (2a), which serves as an engaging portion with (3).
(24) is formed penetratingly, and a substantially hemispherical recess (26) formed inside the spoke hole (24) has a locking head described later.
(34) is just accommodated. The spoke holes (24) are set to have a diameter slightly larger than the diameter of the shaft portion of the spoke (3) and smaller than the locking head portion (34).

In the spoke (3), a hemispherical locking head (34) is linearly connected to one end of a linear shaft portion, and a screw portion (35) is connected to the other end. It has been set up. Therefore, this spoke (3) has its shaft part
When inserted into the spoke holes (24) from the inner peripheral side of (2a), the locking head (34) is housed in the recessed portion (26), and the annular portion (2a).
It is engaged in a state that it does not come off, then the screw part (35) is
When the nipple (N) inserted into the spoke hole of the rim (1) is screwed, the tensioning of the spoke (3) is completed.

As the rolling bearing unit (5), a so-called ball bearing of a general type is adopted, and an outer ring (51) and an inner ring (52), and a plurality of steel balls (B) interposed therebetween. (B) consists of. The annular portion (2a) is set such that its axial length is set to a length capable of accommodating the outer ring (51) and has a predetermined fit in relation to the outer diameter of the outer ring (51). It is set to tolerance. The axial length of the shaft portion (42) is made to match that of the inner ring (52), and its diameter is set to a predetermined fitting tolerance in relation to the inner diameter of the inner ring (52). Has been done.

Therefore, when the rolling bearing unit (5) is pushed into the space between the annular portion (2a) and the shaft portion (42), the inner ring (52)
Comes into contact with the large diameter portion (41), and the rolling bearing unit (5) is mounted in a positioned state. When the rolling bearing units (5) and (5) are mounted, the hub body (2) is rotatable with respect to the axle (4) by the relative rotation of the outer ring (51) and the inner ring (52).

Incidentally, in order to hold the above-mentioned rolling bearing unit (5) in the state where it is retained in the mounting portion, each screw shaft portion is held.
A tightening nut (6) is screwed onto (4b). The tightening nut (6) is composed of a nut portion (6a) and a flange portion (6b) which is continuously provided on the outer peripheral side of the inner end portion of the nut portion (6a). The diameter is set to be slightly smaller than the inner diameter of 51), and the outer diameter of the flange portion (6b) is set to substantially match the outer diameter of the outer ring (51).

On the outer peripheral portion of the inner end surface of the nut portion (6b), an annular convex portion (61) is provided along the outer peripheral edge of the nut portion (6b). Annular protrusion
The (61) is pressed against the inner ring (52). Further, since the flange portion (6b) is provided at a position slightly lower than the top surface of the annular convex portion (61), when the tightening nut (6) is completely screwed, the flange portion (6b) The space between the outer ring (51) and the inner ring (52) is closed with a slight gap between the outer ring (51) and the outer ring (51).

In the first embodiment, the spokes (3) and (3) are stretched radially from the hub body (2), and the penetration forming direction of the spoke holes (24) is an annular portion (2a). ), The screw part (35) must be aligned with the spoke hole of the rim (1) when the spoke (3) is inserted in the spoke hole (24). The inner peripheral side of the annular portion (2a) is slightly inclined outward.

Next, the actual condition of assembling and using the bicycle wheel will be described in detail below. When assembling the bicycle wheel described above, first, in the spoke holes (24) (24) arranged in the left and right annular parts (2a) of the hub body (2), the annular parts (2a)
Spokes (3) tilted outward from the inner circumference of the open end of the hub body (2) toward the outside of the annular part (2a) from the direction perpendicular to the axis of the hub body (2).
The linear shaft portion is inserted to bring the locking head portion (34) into the recessed portion (26). Then, after the insertion of all the spokes (3) is completed, the rolling bearing unit (5) is fitted into each annular portion (2a) from the outside. Further, thereafter, the threaded portion (35) of each spoke (3) is fixed to the rim (1) by the nipple (N), and the assembly of this wheel is completed.

In the case of this bicycle wheel, since the locking head portion (34) is directly engaged with the relatively small annular portion (2a), the total number of the spokes (3) and (3) is reduced. As described in the above-mentioned action section, each spoke is
Since only the tensile force mainly acts on each part of (3), the tension that one spoke (3) can bear can be increased. Therefore, even if the total number of the spokes (3) (3) is small, the wheel has sufficient wheel strength. [Embodiment 2] The above-mentioned Embodiment 1 is a rolling bearing unit.
(5) (5) is configured as a unit separate from the hub body (2) and the axle (4). In the second embodiment, as shown in FIG. 3, each rolling bearing unit ( The bearing on the inner peripheral side of 5) is connected to and integrated with a part of the axle (4).

In this case, each large diameter portion (4
A concave curved surface (41a) is formed at the outer end of (1), and an outer ring (51) tightly fitted in the annular portion (2a) has a substantially L-shaped cross section and the curved surface is formed. The surface facing the (41a) is formed to be a curved surface (51a). The radius of curvature of each cross section of these curved surfaces (41a) (51a) is set slightly larger than that of the steel ball (B), and these curved surfaces (41a) (51a)
Steel balls (B) and (B) are sandwiched between them.

At the time of assembling the rolling bearing unit (5) having the above-mentioned structure, with the hub body (2) fitted on the axle (4), the steel ball (B) is opened from the open end of each annular portion (2a). After fitting (B), the outer ring (51) is fitted in the annular portion (2a). At the time of this fitting, the inner end surface of the outer ring (51) is positioned by abutting against the step portion (21a) provided on the inner peripheral surface of (21), and
Since the distance from the edge of (21) to (21a) matches the axial length of the outer ring (51), the outer ring (51) is
When accommodated in (2a), these outer end surfaces become the same surface.

A dish-shaped reinforcing disk (C) is externally fitted by screw connection to a part of the outer peripheral surface of the annular portion (2a) from the outer end surface, whereby the outer ring (51) is annular. Department (2
It is retained in the inside of a) in a retaining state, and the strength of the annular portion (2a) against the radially outward force is improved. In the first and second embodiments described above, the spokes (3) may rotate together when the spokes (3) are assembled.
To prevent this, the configuration shown in FIGS. 4 and 5 can be adopted.

In this case, as shown in FIG. 4, the hemispherical base portion (34a) is provided on the side facing the annular portion (2a) of the locking head portion (34) of each spoke (3). It is composed of a pair of tongues (7) and (7) which project laterally from the base (34a) and are provided so as to be symmetrical to each other. Then, as shown in FIG. 5, the annular portion
An annular groove (26a) having a semicircular cross section that fits the cross section of the base portion (34a) is formed on the inner peripheral side of the vicinity of the open end of (2a), and the spoke holes (24) ( 24) is penetrated.

In this case, when the spokes (3) are inserted into the spoke holes (24) and the locking heads (34) are fitted and engaged in the grooves (26a), the tongue pieces (7) (7) is parallel to the groove (26a) at the center of the groove (26a). Then, even if the turning force acts on the spokes (3) in this state, the tongues (7) and (7) will be
Since it comes into contact with the central portion of the wall surface of 6a), the locking head (34) is not rotated any further. Therefore, when screwing the screw part (35) and the nipple (N), the spoke (3)
Does not rotate together.

Furthermore, in the above-mentioned first and second embodiments,
The spokes (3) (3) are stretched in the radial direction with respect to the hub body (2) .The spokes (3) (3) are stretched in the tangential direction of the bowl (21) and It may be a type in which adjacent spokes (3) and (3) are crossed (hereinafter, referred to as a traverse type).
In this case, as shown in FIGS. 6 and 7, the locking head (34) formed on the columnar body orthogonal to the linear shaft of the spoke (3).
And a recess having an arc-shaped cross section, which is provided on the inner peripheral side of the open end of the bowl (21) and in which the locking head (34) having the above-mentioned shape is exactly accommodated.
(27) can be engaged with each other, and a long hole as a spoke hole (24) that is substantially parallel to the peripheral edge can be formed in a substantially central portion of the recess (27). In addition, adjacent spoke holes (24) (24)
The shaft portions of the spokes (3) and (3) can be intersected with each other by alternately displacing the distance from the edge of the bowl portion (21) by the axial diameter of the spokes (3).

In this bicycle wheel, the spokes
(3) Since the tension type of (3) is a twilling type,
Even if a rotational driving force is applied to the hub body (2) while the wheels are grounded, the rotational driving force of the hub body (2) is effectively transmitted to the rim (1) side. In addition, although the above-mentioned embodiment is carried out on a spoke type wheel for a bicycle, it goes without saying that the present invention can be applied to a spoke type wheel other than a bicycle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a spoke wheel according to a conventional technique.

FIG. 2 is a sectional view showing a structure of a spoke type wheel according to the first embodiment of the present invention.

FIG. 3 is a sectional view of essential parts of a spoke type wheel according to a second embodiment.

[Fig. 4] Side view when the spokes (3) are prevented from co-rotating

FIG. 5 is an explanatory perspective view showing the engagement between the annular groove (26a) and the spokes (3).

FIG. 6 is an explanatory perspective view of a bowl portion (21) in the case of adopting a traverse type.

FIG. 7 is a sectional view of an essential part showing the engagement between the locking head (34) and the recess (27).

[Explanation of symbols]

 (1) ・ ・ ・ Rim (2) ・ ・ ・ Hub (3) ・ ・ ・ Spoke (4) ・ ・ ・ Axle (21) ・ ・ ・ Bowl (24) ・ ・ ・ Spoke hole (34)・ ・ ・ Locking head (26) ・ ・ ・ Recessed part (5) ・ ・ ・ Rolling bearing unit (51) ・ ・ ・ Outer ring (52) ・ ・ ・ Inner ring (6) ・ ・ ・ Tightening nut

Claims (2)

[Claims] 1. A hub body rotatably fitted onto an axle (4).
In the spoke type wheel in which the spokes (3) and (3) are stretched between the (2) and the rim (1), each spoke (3) has a locking head ( 34), and the other hub body (2) has rolling bearing units (5) at both ends.
An open-ended bowl (21) (21) is formed so as to accommodate (5), and spoke holes (24) (24) are formed through the bowl (21) (21) to form the bowl. The inner diameter of the open end of the portion (21) is such that the straight spokes (3) are from the inner peripheral side of the bowl portion (21) to the spoke holes (24).
The size of the rolling bearing unit is set so that it can be inserted toward the spoke hole forming part on the inner peripheral surface of the bowl part (21).
A recess for accommodating the locking head (34) with the outer periphery of (5)
Spoke wheels with (26). 2. An outer ring (51) in which the rolling bearing unit (5) is tightly fitted in the bowl (21) and an inner ring in which the rolling bearing unit (5) is tightly fitted on the axle (4).
(52) is provided, and a tightening nut (6) that is pressed against the inner ring (52) and closes the open end of the bowl (21) with a slight gap is screwed onto the axle (4). The spoke type wheel according to claim 1, wherein the spoke type wheel is used.