JPH052843B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a means for fixing a tubular member such as a pipe and a power transmission means such as a gear.

(Prior art) When connecting a gear, pulley, sprocket, etc. to transmit torque to a pipe, the gear must be fixed so that it can rotate together with the pipe, and the gear must be fixed so that it can rotate with the pipe. It must be secured so that it does not move.

Conventionally, as such a fixing means, a means has been used in which a through hole is provided in the pipe and the gear, and a pin or the like is inserted into the through hole to fix the pipe or a set screw is used. This fixing means using pins or set screws has a limit in transmission torque, may cause deformation of the pipe, and requires alignment of the through holes when fastening. Particularly in recent years, automatic assembly has been attracting attention, and when connecting pipes and gears using robots, etc., special sensors and positioning means are required for positioning with means such as pins and set screws. This has become a hindrance.

(Purpose) The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a fixing means that makes it possible to easily connect a pipe and a gear without using pins, set screws, etc. .

Another object of the present invention is to provide a fixing means that allows pipes, gears, etc. to be easily fastened during automatic assembly.

(Structure) The object of the present invention is to provide a rotation prevention means for a hollow tubular member such as a pipe, a bendable piece that prevents a member to be fastened such as a gear from coming off toward the end, and a movement of the gear or the like toward the center. In addition to providing a contact portion that prevents
This can be achieved by fixing means in which a member to be fastened, such as a gear, is provided with a processed portion that engages with the rotation prevention means.

(Example) The present invention will be described in detail below based on examples.

FIG. 1 shows a first embodiment of the present invention. The gear 1 has a through hole 2 so that it can be attached to a pipe, and has a protrusion-like processed portion 3 on the inner peripheral surface of the through hole 2 (FIG. 1a). The pipe 4 has a bendable piece 5 at one end, and this piece 5 can be bent after the gear 1 is attached. In addition, a groove 6 is formed along the axial direction in the pipe 4, and the width of the groove 6 is approximately the same as or slightly larger than the processed portion 3 of the gear 1 to prevent only the gear 1 from rotating in the circumferential direction of the pipe 2. It is now possible to prevent this. The groove 6 is long enough to accommodate the gear 1, and has an abutting portion 7 to prevent the gear 1 from moving inward beyond a predetermined position (FIG. 1b).

Figure 1c shows a state in which such a gear and pipe are used and fixed together. The gear 1 is inserted into the pipe 4 so that the processed part 3 of the gear 1 engages with the groove part 6 of the pipe 4. After inserting the gear 1 until the processed part 3 of the gear 1 hits the contact part 7, the piece 5 is bent outward.
By keeping the distance between the bending position of the piece 5 and the contact portion 7 substantially the same as the width of the gear 1, the gear 1 does not move in the axial direction of the pipe 4. The gear 1 can also be fixed in the rotational direction by making the width of the groove 6 almost the same as or slightly larger than the width of the processed part 3, but the width of the groove 6 may be larger than the width of the processed part 3. . In this case, the gear moves in the rotational direction,
During power transmission, the machined part 3 of the gear comes into contact with the wall surface of the groove 6, and no movement beyond play occurs, and strict positioning is not required when attaching the gear to the pipe, which is particularly advantageous for automatic assembly. . If the end face of the processed part on the pipe side or the end face of the groove part on the gear side is cut off diagonally, installation becomes easier.

FIG. 2 shows a second embodiment. The pulley 8 has a through hole 9 and an end surface 10 opposite to the pipe side.
A groove-shaped processed portion 11 is provided in the groove. One end of this groove-shaped processed portion 11 reaches the through hole 9, and the depth of the processed portion 11 is made larger than the wall thickness of the pipe. A piece 13 is provided in the pipe 12 by making two cuts from the end surface, and protruding abutting portions 14, 14' are provided on the outer periphery of the pipe.
After inserting the pulley 8 into this pipe, the piece 13 is bent along the groove-shaped processed portion 11. When bending, the piece 13 is placed inside the groove-shaped processed portion. By doing this, the end face of the piece 13 can be used as a rotation prevention means, and by bending the piece 13, the pulley 8 does not come off the pipe and is moved inward by the abutting members 14, 14'. Not at all. Although the figure shows an example in which the piece 13 is provided by cutting, it may also be a protruding piece as shown in FIG. 1b. Further, although the abutting portions 14, 14' are shown as ring-shaped members, they may be block-shaped members, or may be pipe-processed with protrusions, or may be E-rings or the like.

FIG. 3 shows a third embodiment. The gear 15 has a protrusion-shaped first processed portion 16 and a groove-shaped second processed portion 17, and the pipe 18 has a bendable piece 19 and a groove 20. The piece 19 has a protrusion 2 as shown in Fig. 3c.
It may be 1. Insert the gear 15 so that the protruding first processed part 16 is along the groove 20 of the pipe, and
Fold 9 to complete fixing. In this way, the fixation becomes stronger.

Although FIGS. 1 to 3 show the case where the fastened member is fixed to the end of the pipe, it can be similarly carried out even when the fastened member is fixed to the inside of the pipe instead of the end.
FIG. 4 shows an example of fixation on the inside.

A bendable piece 23 is formed at a predetermined position of the pipe 22 by cutting. A through hole 24 for attaching an E-ring is formed at a position inside this piece 23, and an E-ring 25 is attached thereto. Instead of the E-ring 25, a ring-shaped or block-shaped member as shown in FIG. 2 may be fixedly provided. After inserting the pulley having the processed portion shown in FIG. 2, the piece 23 is bent to complete fixing. It is also possible to use a member to be fastened which has a groove in the pipe and has a processed portion as shown in FIG. 1 or 3. In this case, it is not necessary to use an E-ring by forming an abutting portion in the groove.

In the embodiments described above, power transmission members such as gears, pulleys, or sprockets have been described as fastened members, but they are not limited to these power transmission members, and the rotation or axial movement of the pipe may occur in the support member of the pipe. It can be used as a fixing means to prevent

The pipe only needs to have a wall thickness that allows the bendable piece to be bent, and a so-called thin-walled pipe is preferable. Processed parts of the members to be fastened, bendable pieces of the pipe, etc. can be processed on these members in advance. In addition, if the gear needs to be replaced due to wear or the like after it has been fixed, it can be removed by pulling up the piece.

(Effects of the Invention) As detailed above, the present invention provides a pipe with a rotation prevention means, a bendable piece, and a contact portion, and bends the piece by engaging with a processed portion provided on a member to be fastened. This type of fixing means allows the fastened members to be fixed without moving in the axial direction, and without the fastened members or pipes moving in the circumferential direction. This can be achieved by simply bending the piece after inserting the part into the pipe. This means that the fixing of the pipe and the members to be fastened, which has conventionally been difficult to assemble automatically, can be accomplished by simply bending the pipes by applying predetermined processing to each member in accordance with the present invention. This makes automatic assembly possible.

[Brief explanation of drawings]

Figure 1a, b, c, Figure 2a, b, c, Figure 3
Figures a, b, and c and Figure 4 are diagrams for explaining embodiments of the present invention, respectively. 1, 15... Gear, 2, 9, 24... Through hole, 3,
11, 16, 17...processing section, 4, 12, 18, 2
2... Pipe, 5, 13, 19, 23... Bendable piece, 6... Groove, 7, 14, 14'... Contact portion, 8...
Pulley, 25...E ring.

Claims (1)

[Claims] 1. A means for fixing a hollow tubular member and a fastened member having a through hole whose inner diameter is slightly larger than the outer diameter of the hollow tubular member, and which prevents rotation prevention means and the fastened member from coming off in the end direction. A hollow tubular member having a bendable piece for preventing movement and an abutment portion for preventing movement of the member to be fastened in the center direction, and a member to be fastened having a processed portion that engages with the rotation prevention means. A fixing means characterized by: