JPS5925736Y2 - Seal structure in bicycle head - Google Patents

Description

[Detailed description of the invention] This invention is a seal structure in the bicycle head, specifically, a cone is attached to one of the head pipe and the front fork, a bowl is attached to the other, and the head pipe is freely rotatably supported by the front fork. This invention relates to a seal structure in a powerful head section.

Generally, a certain gap is provided between the cone and the bowl in the bicycle head to prevent the opposing surfaces from coming into contact with each other during relative rotation and to ensure smooth rotation. Since the gap is open outward, dust enters through this gap and adheres to the ball receiving surface between the conduit and the bowl and the ball interposed between the conduit and the bowl. There is a problem in that the transfer of the ball becomes poor and the bundle operation becomes difficult.

The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a seal structure that can prevent dust from entering through the gap while allowing smooth bundle operation. It is in the point of doing.

Accordingly, the present invention provides a seal structure for a bicycle head section, in which a cone is attached to one of the head pipe and the front fork, and a bowl is attached to the other, and the head pipe is rotatably supported by the front fork. A split ring-shaped seal having a width wider than the gap between the cone and the bowl and opposite side end surfaces is formed, and the seal is formed between the cone and the bowl. This is characterized in that the space between the two ends is covered, and the side end surfaces are brought into close contact with each other by means of a connecting means.

Embodiments of the present invention will be described below based on the drawings.

1 is a head pipe fixed to the front end of the pipe 2 and the lower pipe 3; 4 is a front fork whose upper part is inserted into the head pipe 1; 5 and 6 are balls attached at regular intervals on the outer circumference of the upper part of the front fork. Push and 7.8 are bowls attached to the upper and lower ends of the head pipe 1, and balls 9 and 10 are interposed between the bowls 7 and 8 and the balls 5 and 6, respectively, to hold the head pipe 1. A ring that is rotatably supported on the front fork 4 and has a width such that the gaps H, H formed between the cones 5, 6 and the bowls 7, 8 are wider than the gaps H, H. It is hidden by the shaped seals 11 and 12.

However, the lever seals 11.12 are formed by cutting a ring-shaped elastic material at one point in the circumferential direction in the radial direction and forming opposing side end surfaces 11a, 11a and 12a, 12.
The seal 11.
2 is formed to be larger than the outer diameter of the cones 5, 6 and the bowls 7, 8, and covers the outer periphery of the convexes 5, 6 and the bowls 7, 8, and the cut portion is connected by a coupling means. Side end surface 11 a
, 11 a, 12 a, and 12 a are brought into close contact with each other to hide the gaps H, H.

Said coupling means of this seal 11.12 include seal 11,
Annular locking grooves 11b, 12b are provided on the outer periphery of the ring 12, and a roughly C-shaped ring spring 13.14 is formed, and the ring spring 13.14 is fitted into the locking groove 11b, 12b. lateral end face 11a of seal 11.12.

11a, 12a, and 12a portions are pressed in the proximal direction, and the side end surfaces 11a, 11a, and 12a, 12a
It brings them into close contact.

Also, as this coupling means, the side end surface 11a as shown in FIG.
, 11a, 12a, and 12a, a locking piece 11C, 12C having a locking portion is provided protrudingly from one side of the side end surface 11a.
A recessed portion 11d that fits into the locking pieces 11C and 12C on the other of the 11a and 12a and 12a portions.

12 d is provided, and the recessed portion 1 of the locking pieces 11C and 12C is provided.
1d and 12d, the side end surfaces 11a, 1
1a, 12a, and 12a may be brought into close contact with each other, or an adhesive or an adhesive tape may be used (not shown).

Note that the seals 11 and 12 are the cones 5 and 6 and the bowl 7°8.
However, when the split end surfaces 11a, 11a and 12a, 12a are brought into close contact with each other by the coupling means, they are fixed to one of the cones 5, 6 and the bowls 7, 8. However, the rotation may be made free only with respect to the other side.

Further, in FIG. 1, 15 is a bundle post, and 16 is a pulling screw.

The present invention is constructed as described above, and includes the seal 11.
12 to the side end surfaces 11a, 11a and 12a, 12a
The balls 5, 6 and the bowls 7.8
The ring spring 13.14 is fitted into the outer periphery of the cones 5, 6 and the bowls 7, 8, and the ring spring 13.14 is fitted into the locking grooves 11b, 12b of the seal 11.12. and the side end surfaces 11 a, 11 a and 12 a, 12
a are brought into close contact with each other to hide the distance between the cones 5 and 6 and the bowls 7 and 8.

Therefore, even if dust tries to enter the interior through the gaps H, H, it can be prevented from entering.

The head shown in FIG. 1 has a front fork 4, a cone 5,
6, the bowls 7 and 8 are attached to the head pipe 1, but they may be attached in the opposite direction.

As described above, the present invention forms a diagonal ring-shaped seal having a width wider than the gap between the cone and the bowl, and has opposing side end surfaces, so that the cone and the bowl can be connected to each other. Since the spaces between the bowls are covered and the side end surfaces are brought into close contact with each other by the coupling means, it is possible to prevent dust from entering through the gaps, and at the same time, the cone and the bowl do not come into contact with each other during relative rotation. , the bundle operation can be carried out smoothly over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a perspective view of the seal, FIG. 3 is a perspective view of the ring spring, and FIG. 4 is a different embodiment of the seal. It is a perspective view showing an example. 1... Head pipe, 4... Front hawk, 5, 6... Ball pusher, 7, 8... Bowl,
11.12... Seal, 13, 14-...
One wheel is h...gap, 11 a, 11
a, 12a, 12a... side end surface.

Claims (1)

[Scope of utility model registration request] A sealing structure in a bicycle head section in which a cone is attached to one of a head pipe and a front fork, a bowl is attached to the other, and the head pipe is rotatably supported on the front fork, the cone and the bowl being forming a split ring-shaped seal having a width wider than the gap between them and having opposing side end surfaces, and covering the space between the cone and the bowl, A seal structure in a bicycle head section, characterized in that the side end surfaces are brought into close contact with each other by a coupling means.