JPH05296216A - Caulking structure of shaft - Google Patents

Abstract

PURPOSE:To provide uniform caulked joint even by manual work without using any special tool or metal mould by furnishing round holes drilled coaxially with a shaft and a caulked part shaft diameter of which is enlarged by press- fitting steel balls diameter of which is slightly larger than that of the round holes in caulking structure of the shaft. CONSTITUTION:In a planet gear type transmission gear 1, roud holes 13 are drilled on both ends of a planetary shaft 8, and steel balls 14 diameter of which is slightly larger than the diameter of the round holes 13 are pushed in the round holes 13 from their opening sides. By this steel ball pushing-in, the end part outer periphery of the planetary shaft 8 is deformed, bulged parts 16 are made and they bite into side walls 4a, 4b of a carrier and strongly caulked and jointed. Deformation at this time of caulked joint is carried out within or out of the limit of elasticity, it is impossible that the steel balls 14 escape from the round holes 13 because the inner diameter of the round holes 13 is smaller than that of the steel balls 14 and because of strong frictional force, and accordingly, permanent joint can be provided. Additionally, in the case when the round holes are lubricating oil passages, it is possible to omit a blind pig to block the end part of those passages.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking structure for connecting an end of a shaft to a shaft support.

[0002]

2. Description of the Related Art Conventionally, as means for inserting the end portion of a shaft into a shaft hole of a support and caulking and coupling it, a dish-shaped chamfered portion or two or more notched portions are provided at the end portion of the shaft, A structure is used in which the end face is pressed to be plastically deformed into a large diameter and press-fitted into the chamfered part or the cut part. For example, JP-A-62-1
In Japanese Patent No. 13946, both ends of a planetary shaft of a planetary gear device are pushed and expanded to fix the planetary shaft to a carrier.

However, when performing the crimping with a die,
An expensive mold must be prepared, and when caulking by hand, it is troublesome and it is difficult to obtain a caulking connection having the same strength.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to efficiently obtain a uniform caulking connection even by manual work without using a special tool or mold. By adopting this caulking connection, the secondary problem is to close the through hole such as the lubricating oil passage that penetrates the shaft.

[0005]

Means for Solving the Problems According to the means for solving the above problems in the present invention, a shaft hole penetrating the shaft support, a shaft inserted in the shaft hole, and a diameter of the shaft expanded and caulked in the shaft hole. In a caulking structure of a shaft including a caulking portion, a caulking structure in which a shaft is enlarged by press-fitting a round hole formed concentrically with the shaft and a steel ball having a diameter slightly larger than the round hole into the round hole. And a section.

[0006]

In the above means, the diameter of the shaft is expanded by the steel ball pushed into the round hole at the end of the shaft, and the inner surface or the opening of the shaft hole of the support is pressed to integrally combine the holes. Is blocked.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, 1 is a planetary gear type transmission, 2 is a sun gear provided on a central shaft 3, 4 is a carrier, and 4 is a carrier.
3 sets of planetary gears 5 and 6 of 2 sets are supported by the.
The planetary gears 5 and 6 are rotatably supported by planetary shafts 8 and 8 having the same diameter via needle bearings 7.
Are fixed by caulking to shaft holes 9, 9 provided in both side walls 4a, 4b of the shaft support or carrier 4.

A pipe shaft 10 is fixed to one side wall 4a of the carrier 4, a ring gear 12 is provided in a case 11 surrounding the carrier 4, and each gear is composed of a sun gear 2, planetary gears 5, 6 and a ring gear. It meshes in the order of 12. Therefore, by fixing one of the three elements of the central shaft 3, the tube shaft 10 and the case 11, the power transmission action is performed between the other two elements.

In order to fix the planet shaft 8 to the carrier 4, as shown in FIG. 3, round holes 13 are formed at both ends of the planet shaft 8.
A steel ball 1 having a diameter slightly larger than the diameter of the round hole 13
4 is pushed in from the opening side of the round hole 13. Due to this pushing, the outer periphery of the end of the planetary shaft 8 is deformed and a bulge 16 is generated,
The bulging portion 16 is embedded in the side walls 4a and 4b of the carrier so as to be strongly caulked. The deformation when this caulking is
It is performed within the elastic limit or outside the elastic limit.
Since the inner diameter of 3 is smaller than that of the steel ball 14 and the strong frictional force, it is impossible to escape from the round hole 13, and a permanent connection is made. As a precaution, the diameter of the round hole 13 may be reduced by caulking after the steel ball has been pressed.

Next, the embodiment shown in FIG. 4 will be described. Figure 4
In the figure, 20 is a planetary gear type transmission having two transmission systems, 21 is a central shaft, and 22 is a spline thereof, to which a carrier 23 of a planetary gear is connected. Carrier 23
Is the center carrier body 24 and the carrier side plates 2 on both sides.
5, 26, and each of the carrier side plates 25, 26 has a plurality of arms 25a, 2a extending inwardly.
6a is provided so as to be bent, and the tip thereof is the carrier body 24.
Is welded to the outer peripheral surface of the to form a frame.

The carrier 24 has a shaft hole 27,
28 and 29 are bored, and a planetary shaft 32 in which two kinds of planetary gears 30 and 31 are rotatably fitted is inserted and supported. Therefore, the carrier 24 acts as a shaft support. A lubricating oil passage 33, which is concentric with the center line of the planetary shaft 32, is formed so as to penetrate therethrough.
3 is shunted to the teeth of the planetary gears 30 and 31 by an oil passage 34, and communicates with an oil supply passage 36 provided on the central shaft 21 by an oil passage 35.

In order to fix the planetary shaft 32 to the carrier 23, steel balls 37 having a diameter slightly larger than the diameter of the lubricating oil passage 33 are press-fitted from both sides of the lubricating oil passage 33, whereby the planetary shaft 32 is fixed. In the shaft holes 28 and 29, they are expanded in the same manner as shown in FIG. 3 and caulked to the carrier side plates 25 and 26. Since both ends of the lubricating oil passage 33 are closed by this caulking, it is not necessary to screw a blind plug as in the conventional case.

By forming the chamfered portions 38 and 39 in the openings on the outer side surfaces of the shaft holes 28 and 29, the steel balls 37 can be easily press-fitted and the carrier side plates 25 and 2 after coupling are formed.
The blocking action against the outward displacement of 6 is improved. Also,
Providing the radial notch improves the anti-rotation effect of the shaft.

The sun gears 42 and 43 provided on the tube shafts 40 and 41 mesh with the planetary gears 30 and 31 from the inside, and the ring gears 45 and 4 on the inner surface of the case 45 from the outside.
6 are in mesh. Therefore, for example, by fixing the central shaft 21 and driving the case 44, the transmission system passing through the ring gear 45, the planetary gear 30, and the sun gear 42 and the transmission system passing through the ring gear 46, the planetary gear 31, and the sun gear 43 operate. To do. At this time, the lubricating oil supplied from the hydraulic pressure source (not shown) flows into the lubricating oil passage 33 from the oil supply passage 36 and the oil passage 35, and flows out from the oil passage 34 to the meshing surfaces of the planetary gears 30 and 31 to generate teeth. Lubricate parts.

Although the fixing of the planetary shaft has been described above as an example, the present invention is not limited to this and can be used for fixing various shaft-like bodies.

[0016]

As described above, according to the present invention, when the shaft is fixed in the shaft hole of the shaft support, a steel ball having a slightly larger diameter is press-fitted into the round hole provided concentrically with the shaft. Since a caulking structure can be obtained, it is not necessary to use a special mold, and it is possible to quickly press-fit with an appropriate pressurizing tool, which has the effect of obtaining a strong joint structure between the shaft and the shaft support. When the hole is the lubricating oil passage, the end portion of the passage is closed so that the blind plug can be omitted.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

[Fig. 2] Front view of the same as above

[Fig. 3] Cross-sectional view of main parts

FIG. 4 is a vertical sectional view of another embodiment.

[Explanation of symbols]

 4a, 4b, 25, 26 Carrier side plate (shaft support) 9, 28, 29 Shaft hole 8, 32 Shaft 13, 33 Round hole 14, 37 Steel ball

Claims (1)

[Claims] 1. A caulking structure for a shaft, comprising: a shaft hole penetrating the shaft support; a shaft inserted into the shaft hole; and a caulking portion caulking in the shaft hole by expanding the diameter of the shaft. A caulking structure of a shaft, comprising a round hole bored concentrically with the shaft, and a caulking portion in which a steel ball having a diameter slightly larger than the round hole is press-fitted into the round hole to enlarge the shaft diameter. ..