JPH0212151Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to the structure of a hawk bearing in a tricycle for children that is attached to the lower end of the hawk to support the crankshaft.

[Background Art] As shown in FIG. 7, in the conventional hawk bearing A' of a tricycle for children, the lower end of the hawk connecting part 1 that connects the lower end of the hawk has an axial direction perpendicular to the hawk connecting part 1. It was made of synthetic resin and was integrally provided with a facing bearing tube 2'. This hawk bearing
The bearing tube 2' of A' has a relatively long cylindrical shape in the axial direction, and has a bent portion 4 bent at approximately 90 degrees of the crankshaft 3.
could not be inserted into the bearing sleeve 2'.
Incidentally, a crank mount 5 having a U-shaped cross section is attached to one end of the first horizontal shaft 3a of the crankshaft 3 by welding in order to connect it to the front wheel.
Since the bent part 4 of the crankshaft 3 cannot be inserted into the bearing sleeve 2' of A', the bearing sleeve 2' is inserted into the first horizontal shaft 3a of the crankshaft 3 as shown in FIG. was welded to the first horizontal shaft 3a of the crankshaft 3. For this reason, when welding, special care must be taken to prevent thermal deformation of the synthetic resin hawk bearing A', which has the disadvantage of making it difficult to weld.Furthermore, the plating performed after welding the crank attachment 5 is also hawk-free. This had the disadvantage that it had to be done with bearing A' attached and it was difficult to plate.

[Purpose of the invention] The present invention was made in view of the above points, and the purpose of the present invention is to make it possible to insert the bearing sleeve even into the bent part of the crankshaft, and to make it possible to insert the bearing sleeve into the bent part of the crankshaft after welding the crank mount. To provide a hawk bearing for a tricycle for children, in which a bearing sleeve can be inserted into a crankshaft, and a crank attachment tool can be easily attached to the crankshaft by welding, and also can be easily plated.

[Disclosure of the invention] The hawk bearing of the tricycle for children of the invention includes a hawk connecting portion 1 connecting the lower end of the hawk 6, and a crankshaft 3.
It consists of a bearing sleeve 2 that supports the bearing by inserting it into the bearing sleeve 2, and the axial width of a part of the circumferential direction inside the bearing sleeve 2 is narrower than the other part. This solves the drawbacks of the example. In other words, by making the axial width of a part of the circumferential direction of the bearing sleeve 2 narrower than other parts, the bent portion 4 of the crankshaft 3 can be inserted into the bearing sleeve 2 even if the length thereof is relatively long. After the crank fitting 5 is attached to the crankshaft 3 by welding, the hawk bearing A can be attached to the crankshaft 3, and the crank fitting 5 can be easily attached and plated.

The present invention will be explained in detail below using examples.

As shown in FIG. 4, a handle 8 is provided at the upper front part of the infant tricycle 7, and a handle shaft 9 of the handle 8 is rotatably supported on the front part of a frame 10. A wheel cover 1 is attached to the lower end of the handle shaft 9.
1 is attached, and hawks 6 are hung from both sides of the wheel cover 11. A crankshaft 3 is rotatably supported at the lower end of the fork 6 via a fork bearing A of the present invention, and the crankshaft 3 is connected to a front wheel 12 disposed between the forks 6 on both sides. A saddle 13 is attached to the center of the frame 10.
Rear wheels 14 are rotatably mounted on both sides of the rear of the vehicle, and a basket 15 is mounted between the rear wheels 14 on both sides. The crankshaft 3 is bent approximately 90 degrees at two bent portions 4, and has two parallel first horizontal shafts 3a, second horizontal shafts 3b, and vertical shafts 3c. A crank fitting 5 having a U-shaped cross section is fixed to the end of the first horizontal shaft 3a of the crankshaft 3 by welding, and after the crank fitting 5 is fixed, it is plated together with the crank fitting 5. As shown in FIGS. 2a, b, and c, the hawk bearing A of the present invention consists of a hawk connecting portion 1 and a bearing sleeve 2, and the whole is integrally formed of synthetic resin. The hawk connection part 1 has a cylindrical shape with an open top, and has a mounting hole 2.
It has 4. The bearing sleeve 2 has a cylindrical shape, and its axial direction is perpendicular to the fork connection portion 1. Approximately two-thirds of the upper circumference of the bearing sleeve 2 is a long bearing portion 16 that is long in the axial direction, and a lower one-third of the circumference of the bearing sleeve 2 is a long bearing portion 16 that is long in the axial direction. is a short bearing portion 19 which is short and located at the center in the axial direction, and both sides of the short bearing portion 19 in the axial direction are formed into cutout portions 17 through which the bent portion 4 is inserted. Arc-shaped chamfers 23 are provided on both sides of the short bearing portion 19. Long bearing part 16
The inner surface of the tube is tapered so that the diameter increases from the center toward the ends. When attaching the hawk bearing A to the crankshaft 3, insert the second horizontal shaft 3b of the crankshaft 3 into the bearing sleeve 2, and insert the bent portion 4 on both sides of the short bearing portion 19 as shown in FIG. 2b. , the vertical shaft 3c is inserted into the bushing 2, the bent part 4 is inserted into the bushing 2, and the first horizontal shaft 3a is inserted into the bushing 2 as shown in FIG. do. The front wheel 12 has a tire 1 on the outer periphery of the wheel body 12a.
2b, and a wheel cap 12c is attached to both sides of the wheel body 12a. front wheel 1
A U-shaped mounting bracket 20 with a lip in cross section is attached to the axis of 2. A crankshaft 3 with a Hawk bearing A attached thereto is arranged on each side of the front wheel 12, and a crank fitting 5 is inserted into the fitting 20 to connect the first horizontal shaft 3a of the crankshaft 3 and the front wheel 12. be done. The hawk connection part 1 of the hawk bearing A is fitted onto the lower end of the hawk 6 as shown in FIG. 3, and fasteners such as bolts, nuts, rivets, etc. are inserted and connected. A pedal 2 is attached to the second horizontal axis 3b of the crankshaft 3.
2 is rotatably attached.

In addition, in the above embodiment, the two left and right crankshafts 3
However, as shown in FIG. 5, an integral crank body B in which the left and right crankshafts 3 are integrally connected may also be used.

Furthermore, in the above embodiment, the short bearing portion 19 having the notch portions 17 on both sides was provided at the bottom in the circumferential direction.
It may be provided at a portion other than the lower portion in the circumferential direction, for example, at the side portion or the upper portion. Further, as shown in FIGS. 6a, b, and c, they may be provided at two locations in the circumferential direction. Figure 6a,
The Hawk bearing A shown in b and c is a long bearing part 16 having a long axial length on both sides in the circumferential direction of the bearing tube 2, and a long bearing part 16 having a long axial length in the upper and lower parts of the circumferential direction. The short bearing part 19 is located at the center in the direction, and both sides of the short bearing part 19 in the axial direction are provided with cutout parts 17 for inserting the bent part 4.

[Effects of the invention] As stated above, in the present invention, the axial width of a part of the circumferential direction inside the bearing cylinder is made narrower than other parts.
Even if the length of the bearing sleeve in the axial direction is relatively long, it can be inserted through the bent part of the crankshaft bent at an approximately 90° angle in a part of the circumferential direction of the bearing sleeve 2 where the width in the axial direction is narrowed. It is possible to attach the crank mount to the crankshaft even after the crank mount is first welded to the crankshaft, and it is easy to attach the crank mount to the crankshaft by welding. It is also easy to process.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a crankshaft and a hawk bearing according to an embodiment of the present invention; FIGS.
The figure is a sectional view showing how the front wheel is attached as above, and Fig. 4 is a perspective view showing the entire tricycle for infants as above.
Fig. 5 is a schematic sectional view of another embodiment of the same as above, Fig. 6 a, b, and c are a front view, longitudinal sectional view, and plan view of another embodiment of the hawk bearing as described above, and Fig. 7 is a conventional example. FIG. 8 is a perspective view of a conventional hawk bearing attached to a crankshaft, in which 1 is a hawk connection and 2 is a bearing sleeve.

Claims (1)

[Scope of utility model registration request] An infant device consisting of a hawk connection part that connects the lower end of the hawk, and a bearing cylinder through which the crankshaft is inserted and supports the bearing, with the axial width of a circumferential part of the bearing cylinder being narrower than the other part. Hawk bearing for tricycle.