JPH037611Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a seal structure for a rotating member in a bicycle, and more particularly, to a seal structure for a rotating member in a bicycle.
The present invention relates to a sealing structure for a rotating member in a bicycle that seals a gap between opposing surfaces of a member and a second member.

Conventionally, various seal structures of this type have been known, but
As the simplest sealing structure, for example, an annular groove is provided on the opposing surface of the first member, and an annular sealing material having a narrow groove is fitted into this annular groove, and the sealing material is used to connect the second member with the annular groove. It seals the gap between the opposing surfaces.

However, in the case of a seal structure using this annular seal material, since the split groove is formed in the seal material to expand or reduce the diameter of the seal material and fit into the annular groove, cannot be sealed,
There is a problem that harmful substances such as rainwater and mud enter through the groove portion, and since the outer circumferential surface of the sealing material and the inner circumferential surface of the second member are opposed to each other for sealing, the sealing portion is The diameter is determined by the inner diameter of the second member, and if the second member has a large diameter, rotational resistance will increase due to contact with the sealing material, so it is necessary to make the gap between the sealing parts large enough to prevent contact. There was also the problem that a sufficient sealing effect could not be obtained even after twisting.

The present invention was devised in view of the above points, and the purpose is to provide a sealing structure for a rotating member of a bicycle that can reliably seal the rotating member with less increase in rotational resistance using the simplest sealing structure. be.

Therefore, the present invention supports a second member provided with a bearing hole having a rolling surface on the outer periphery of the first member having a rolling surface on the outer periphery of the first member through rolling elements so as to be relatively rotationally free, and also A sealing structure for a rotating member in a bicycle, wherein an annular sealing material is attached to a sealing portion between opposing surfaces between an open end portion and an axially outer side of the first member to seal a gap between the opposing surfaces. , a cap that hides the bearing hole and has a through hole in the center is attached to the end of the bearing hole of the second member, and an outer circumferential surface of the first member that is axially outward from the rolling surface. An annular groove is provided in the annular groove, and a plurality of sealing materials having split grooves are fitted into the annular groove such that the split grooves are in conflict with each other. It is characterized by being placed in contact with.

An embodiment of the sealing structure for the rotary member in the bicycle of the present invention will be described below based on a drawing in which the rotary member is assembled to a bicycle hub.

In FIGS. 1 and 10, the hub A includes a hub shaft 40 whose both ends are fixed to the bicycle frame, a ball pusher 41a having a rolling surface t1 on the outer periphery, and a bowl 41b having a rolling surface t2 on the inner periphery. A hub body 42 having a bearing hole g is rotatably supported through a bearing consisting of a bearing and a rolling element 41c, a ball pusher 41a of the bearing is screwed onto the hub shaft 40, and the bowl 41b is attached to the hub body 4.
2, and a cylindrical cap 43 that hides the bearing hole g and has a through hole in the center is fitted to the end of the bearing hole g of the hub body 42. The hub shaft 40 and the ball pusher 41a are fixed as the first member 1,
The hub body 42 is the second member 2, and the ball pusher 4 is the second member 2.
1a on the outer periphery of the first opposing surface 11, and the second member 2
The second opposing surfaces 21 are provided on the inner circumferential surface of the cap 43 fixed to the hub body 42, and a seal portion a is formed between these opposing surfaces 11 and 21.

The second member 2 is rotatably supported by the first member 1, and has an annular shape on the first opposing surface 11 axially outward from the rolling surface t1 of the ball pusher 41a constituting the first member 1. An annular sealing material 3 provided with a groove 12 and having a narrow groove 31 in the annular groove 12.
and the outer circumferential surface of this sealing material 3 is connected to the second
The first and second opposing surfaces 1 are slightly opposed to the second opposing surface 21 of the cap 43 fixed to the member 2.
This seals the gap in the seal portion a between 1 and 21.

The sealing material 3 is formed into an annular shape having an inner circumferential surface and an outer circumferential surface, and the dividing groove 31 is formed between the inner and outer circumferential surfaces.
The groove 31 allows the sealing material 3 to expand in diameter, and is mainly made of Diuracon or urethane rubber. Note that the material of this sealing material 3 is not particularly limited.

Thus, the annular groove 12 is connected to the sealing material 3.
The second opposing surface 21 is formed in a size that allows a plurality of sealants 3 to come into contact with each other, and the sealant 3 is placed in the annular groove 12. Multiple pieces are fitted, and these sealing materials 3
The grooves 31 of the sealing members 3 are closely arranged in parallel so as to conflict with each other, and the grooves 31 of each sealing member 3 are closed by the side surfaces of the adjacent sealing member 3.

Thus, if harmful substances such as rainwater or mud get on the outer part of the seal part a, this harmful substance can enter into the first groove 31a of the first sealing material 3a located on the outer side. , this first groove 31a
The inner opening part of the second sealing material 3 located on the inner side
b, so that even if the harmful substance enters the first dividing groove 31a, the harmful substance will not be able to enter the first dividing groove 31a.
It is possible to reliably prevent the intrusion from passing through a.

Although two sealants 3 are mainly used as shown in FIGS. 1 and 4, three or more sealants 3 may be used as shown in FIG. 9, or two or more sealants 3 can be used as shown in FIG. They may be juxtaposed at more than one location, or a cap 43 may be provided with an annular groove 12 to support the sealing material 3 in combination as shown in FIG.

Furthermore, as shown in Figs. 1 and 4, each sealing material 3 is formed to have the same size, but as shown in Figs. 6 and 7, each sealing material 3 is formed to have a different inner or outer diameter. A stepped portion may be formed between the three. Furthermore, the inner peripheral surface and outer peripheral surface of the sealing material 3 are
An annular groove may be provided in the middle part of the circumferential surface.

The sealing structure for a rotating member of a bicycle according to the present invention may be attached to, for example, a bicycle pedal, a bicycle freewheel, a bicycle handle device, or a bicycle crank device, and the locations where it is used are not particularly limited. It's not something you can do.

In short, the first member 1 that rotates relative to the bicycle
Any location may be used as long as it is necessary to seal the seal portion a between the facing surfaces 11 and 21 of the second member 2 and the second member 2.

As described above, the present invention supports a first member having a rolling surface on its outer periphery and a second member provided with a bearing hole having a rolling surface on the outer periphery of the first member through rolling elements so as to be relatively rotationally free. A sealing structure for a rotating member of a bicycle, in which an annular sealing material is attached to a sealing portion between opposing surfaces between an open end of a hole and an axially outer side of the first member to seal a gap between the opposing surfaces. A cap that hides the bearing hole and has a through hole in the center is attached to the end of the bearing hole of the second member, and a cap that is axially outward from the rolling surface of the first member is attached. An annular groove is provided on the outer peripheral surface,
In this annular groove, multiple sealing materials with grooves are placed.
Since the split grooves fit with each other in a manner that contradicts each other, and the outer circumferential surface of the sealing material is brought into contact with the inner surface of the through hole of the cap, the bearing hole of the second member can be hidden by the cap, and the bearing hole can be hidden by the cap. Since sealing can be achieved at a small diameter portion between the inner surface of the through hole of the cap, which has a relatively small diameter, and the annular groove of the first member, the sealing effect can be improved without increasing rotational resistance.

Moreover, since the annular groove into which the sealing material is fitted is provided on the outer circumferential surface of the first member having a rolling surface on its outer periphery, which is axially outward from the rolling surface, cutting of the rolling surface is possible. Subsequently, the annular groove can be cut, and the annular groove is very easy to form.Furthermore, the cap can be easily molded with a molding die having a simple structure, so that the annular groove and the annular groove can be easily formed. Even though the structure is provided with a cap, it can be formed at low cost.

Furthermore, since the inner circumferential surface of the sealing material is fitted into the annular groove on the outer circumferential surface of the first member, and the outer circumferential surface is in contact with the inner surface of the through hole of the cap, rainwater, mud, etc. Even if it adheres to the outer periphery of the seal, it is possible to prevent this rainwater, etc. from directly invading inward along the first member, increasing the sealing effect. When the outer circumferential surface of the material is brought into contact with the inner surface of the through hole of the cap, after reducing the diameter of the sealing material and inserting the first member into the through hole of the cap, the restoring action of the sealing material brings it into contact with the inner surface of the through hole. Because you can
This makes sealing work very easy.

Furthermore, since the grooves of the sealing material are in conflict with each other, it is possible to reliably prevent rainwater etc. from passing through the grooves and intruding inward, thereby further improving the sealing effect.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing the main part of an embodiment of the seal structure for the rotating member in the bicycle of the present invention;
The figure is a longitudinal side view, Figure 3 is a perspective view of only the sealing material placed side by side, Figures 4 to 9 are explanatory diagrams showing the combination of sealing materials, and Figure 10 is assembled to a bicycle hub. FIG. 2 is a partially cutaway sectional view of an embodiment in a state where DESCRIPTION OF SYMBOLS 1... First member, 2... Second member, 43... Cap, 11, 21... Opposing surface, 12... Annular groove, 3... Annular sealing material, 31... Division groove, a...
Seal part.

Claims (1)

[Scope of utility model registration request] A second member provided with a bearing hole having a rolling surface is supported on the outer periphery of the first member having a rolling surface on the outer periphery via rolling elements, and the open end of the bearing hole and the second member are provided with a bearing hole having a rolling surface. A sealing structure for a rotating member in a bicycle, in which an annular sealing material is attached to a sealing portion between opposing surfaces of the second member in the axial direction to seal a gap between the opposing surfaces, At the end of the bearing hole, a cap is attached that hides the bearing hole and has a through hole in the center, and an annular groove is provided on the outer circumferential surface of the first member axially outward from the rolling surface. , a plurality of sealing materials having grooves are fitted into this annular groove such that the grooves are in conflict with each other, while the outer circumferential surface of the sealing material is
A sealing structure for a rotating member of a bicycle, characterized in that the sealing structure is in contact with the inner surface of the through hole of the cap.