JPH0645893U - Bearing structure of bicycle crankshaft - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To obtain a bearing structure for a bicycle crankshaft in which one screw body is fitted in the axle and the other screw body can be easily attached to the axle. . [Structure] A pair of left and right cylindrical bodies 20 and 2 which are internally mounted between the threaded cylindrical portions 17 and 18 and the axle 11 via bearing balls.
At least one outer peripheral wall of No. 1 is such that the axle rotates in the radial direction of the outer cylinder support member through the one screw body in a state where the one screw body 12, 13 is screwed to the outer cylinder support member 25. It is curved so that it can move.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bearing structure for a crankshaft for a bicycle when the left and right cranks to which the pedals of the bicycle are attached are attached to an axle (a shaft for attaching the left and right cranks).

[0002]

[Prior art]

 Conventionally, as an example of this kind, there is one as shown in FIG. Then, 1 is an axle for attaching the left and right cranks 2, 3. Reference numerals 4 and 4a denote a pair of left and right screw-engaged bodies (dust proof caps) fitted in both ends of the axle 1 in a penetrating state. Reference numeral 5 is a ball bearing installed between these screwed bodies 4 and 4a and the axle 1. Reference numeral 6 denotes an outer cylinder supporting member that is screwed to the left and right screw-engaged bodies 4 and 4a and for attaching the pipe or the frame 7.

However, in the above configuration, since the pair of left and right screw bodies 4 and 4a have the same form, when the one screw body 4a is fitted in the axle 1, the other screw body 4 is inserted. If the axle 1 and the outer cylinder support member 6 are not completely aligned with each other, it is not easy to attach the other screw body 4 to the axle 1. Therefore, when the left and right screw bodies are attached to the axle, for example, the left and right screw bodies 4, 4a must be attached to the axle 1 at the same time, which is a very troublesome attachment.

[0004]

[Problems to be solved by the device]

 In view of the above-mentioned conventional drawbacks, the present invention provides a bicycle crank-obtaining bearing structure in which one screw body is fitted into the axle and the other screw body can be easily attached to the axle. Especially.

[0005]

[Means for Solving the Problems]

 The bicycle crankshaft bearing structure of the present invention includes a pair of left and right screw-engagements that are fitted in both ends of the axle in a penetrating state, and bearing balls between the cylindrical portion of the screw-engagement body and the axle. A pair of left and right cylindrical bodies to be installed, a spacer for connecting these cylindrical bodies to a predetermined position, and a pipe or an outer cylinder for mounting the frame, which is internally equipped with this spacer and is screwed to the pair of screw bodies. And a support member, wherein at least one outer peripheral wall of the cylindrical body supports the outer cylinder via the one screw body when the one screw body is screwed to the outer cylinder support member. It is characterized in that it is curved so that it can rotate in the radial direction of the member.

[0006]

[Action]

 First, one screw body is fitted into one end of the axle in a penetrating state. In this case, the outer peripheral wall of the one cylindrical body and the inner peripheral wall of the threaded body are slidably fitted together. Next, the female screw at one end of the outer cylinder support member is screwed into the male screw portion of one screw body.

Thereafter, the center hole of the other threaded body fitted in the other end of the axle in a penetrating state is aligned with the axis of the outer cylinder supporting member, in other words, both the axle and the outer cylinder supporting member. The male screw portion of the other threaded body is screwed into the other female thread of the outer cylinder supporting member while rotating the axle slightly in the radial direction of the outer cylinder supporting member so that the shafts coincide with each other.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

In one embodiment shown in FIGS. 1 to 5, reference numeral 11 is an axle for mounting left and right cranks of a bicycle. Reference numerals 12 and 13 are a pair of left and right screwed bodies that are fitted in both ends of the axle 11 in a penetrating state. As shown in FIGS. 2 to 5, these threaded bodies 12 and 13 have a collar portion 15 having a central hole 14 and a male thread portion 16 extending from one side surface of each of the collar portions 15 to the outer peripheral wall. The inner peripheral wall of the cylindrical portion 18 of the one screw body 13 is formed into a spherical shape (curved section) as a whole.

Reference numerals 20 and 21 denote a pair of left and right cylindrical bodies that are respectively installed between the cylindrical portions 17 and 18 of the threaded bodies 12 and 13 and the axle 11 via bearing balls 19. On the inner peripheral surface of each of the cylindrical bodies 20 and 21, a peripheral groove for the bearing ball is formed at a portion from the outer end portion thereof, and a peripheral groove 22 for a spacer described below is formed at a portion from the inner end portion thereof. Has been done. However, at least one of the cylinders, in this embodiment, the outer peripheral wall of the cylinder 21 on the right side with reference to FIG. 3, is in a state in which one screw body 13 is screwed to the outer cylinder support member described later. The axle 11 is curved (cross-section curved) on a spherical surface so that the axle 11 can be rotated in the radial direction of an outer cylinder supporting member described later through the sliding relationship of the one screw body 13.

Reference numeral 23 is a cylindrical spacer that fixedly connects the left and right cylindrical bodies 20 and 21 at predetermined positions. Ring-shaped ribs 24 that fit into the circumferential grooves 22 of the cylindrical bodies 20 and 21 are provided around the outer peripheral walls at both ends of the spacer 23.

Reference numeral 25 denotes a pipe or an outer cylinder supporting member for mounting the frame 26, which is internally mounted with the spacer 23 and is screwed to the pair of left and right screw bodies 12 and 13. Female threaded portions 27 are formed on the inner peripheral walls of both ends of the outer cylinder support member 25, respectively.

In the above-mentioned structure, first, the one threaded body 13 is fitted into one end of the axle 11 in a penetrating state. In this case, as shown in FIG. 4, the outer peripheral wall of the one cylindrical body 21 and the inner peripheral wall of the threaded body 13 are slidably fitted together. Next, the female screw portion 27 of one end of the outer cylinder support member 25 is screwed into the male screw portion 16 of the one screw body 13. Thereafter, as shown in FIG. 5, the center hole 14 of the other threaded body 12 fitted in the other end of the axle 11 in a penetrating state is aligned with the center axis O of the outer cylinder supporting member 25. While rotating the axle 11 slightly in the radial direction of the outer cylinder support member 25 so that the axes O of both the axle 11 and the outer cylinder support member 25 coincide with each other, the male screw portion 16 of the other screw-engagement body 12 is moved to the outer cylinder. The other female screw portion 27 of the support member is screwed.

[0014]

EFFECTS OF THE INVENTION As is clear from the above description, the present invention has the following effects. (1) When one of the screw bodies is fitted in the axle, the other screw body can be easily attached to the axle. (2) Even if the pair of left and right screw bodies are not simultaneously screwed to the outer cylinder support member at the same time, if one screw body is screwed with the outer cylinder support member, one screw body serves as a stopper. Therefore, it suffices to rotate only the other threaded body. Therefore, the outer cylinder supporting member can be set at a predetermined position, and the work efficiency of assembly is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of the use state of the present invention.

FIG. 2 is an exploded perspective view of a part of the present invention.

FIG. 3 is a schematic cross-sectional view in a combined state based on line 3-3 in FIG.

FIG. 4 is a schematic explanatory view of a main part of the present invention.

FIG. 5 is an explanatory view of the combination of the present invention.

FIG. 6 is a schematic explanatory view showing a conventional example.

[Explanation of symbols]

 11 ... Axle, 12, 13 ... Threaded body, 14 ... Center hole, 17, 18 ... Cylindrical part, 19 ... Bearing ball, 20, 21 ... Cylindrical body, 23 ... Spacer, 25 ... Outer cylinder support member, O ... Central shaft .

Claims (2)

[Scope of utility model registration request] 1. A pair of left and right screw bodies that are fitted in both ends of an axle in a penetrating state, and a pair of left and right cylinder bodies that are installed between the cylinder portion of the screw body and the axle via bearing balls. At least one outer periphery of the cylindrical body is composed of a spacer for connecting these cylindrical bodies at predetermined positions, and a pipe or an outer cylinder supporting member for mounting the frame, which is internally fitted to the spacer and is screwed to the pair of threaded bodies. The wall is curved so that the axle can be rotated in the radial direction of the outer cylinder supporting member via the one screw body when the one screw body is screwed to the outer cylinder supporting member. The bearing structure of the crankshaft for bicycles. 2. The bicycle crankshaft according to claim 1, wherein the inner peripheral wall of one of the screw-engaged bodies which is in sliding contact with the cylindrical body whose outer peripheral wall is formed in a curved shape is also curved. Bearing structure.