JPH0446718A - Automatic worm assembling device - Google Patents

Abstract

PURPOSE:To prevent unreasonable assembling by performing assembling work of worm and wormwheel automatically by the rotating force which is generated when a flexible rotating force providing means contacts a worm shaft resiliently and a rotating force adjusting means. CONSTITUTION:When a worm 6a is assembled in a wormwheel 1 which is mounted in a gear housing 2 in advance, a rotating force is transmitted to flexible rotating force providing means 21-24 by rotating force generating means 31-37. When the rotating force is given in the case that the rotating force providing means 21-24 contact the outer periphery of a worm shaft 6 in which a worm 6a at the tip is inserted in a worm shaft hole 3 of a gear housing 2, the worm 6a and wormwheel 1 are assembled automatically. At this time, the rotating force providing means 31-37 adjust the rotating force by rotating force adjusting means 11-17. That is, when the worm 6a interferes with the teeth of wormwheel 1 and rotating force becomes excessive, the rotating force providing means 31-37 slide on the outside of worm shaft, thereby preventing unreasonable assembling.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an automatic worm assembly device.

"Conventional technology" When assembling a worm into a gear housing equipped with a worm wheel, the worm shaft is held and forcibly rotated to mesh the teeth of both the worm and the worm wheel. There is.

"Problem to be Solved by the Invention" However, in the above method, the teeth of both the worm and the worm wheel are not aligned in phase, so if the worm is forcibly rotated, the teeth of both will interfere and cause damage to the tooth surface. may occur. In addition, if there is a hardness difference between the materials of the worm and the worm wheel, the scratches on the tooth surface will be even more severe, which will not only cause abnormal noise and vibration, but also prevent smooth transmission of rotational force. When installing it in the gear housing, you must manually assemble the worm and worm wheel, adjust the phase of the teeth on both the worm and worm wheel to avoid interference, and then screw in the worm. There are problems with poor workability and inefficiency.

The present invention has been made to solve the above problems, and includes adjusting the rotational force applied to the worm shaft.
It is an object of the present invention to provide an automatic worm assembling device that can automatically assemble a worm to a worm wheel.

"Means for Solving the Problems" As a specific means for achieving the above object, a worm wheel is attached to a gear housing, and the outer periphery of the worm shaft is supported by inserting the tip into a worm shaft hole formed in the gear housing. a flexible rotational force applying means that applies a rotational force by elastically contacting the rotational force, a rotational force generating means that generates a rotational force on the rotational force applying means, and adjusting the rotational force applied by the rotational force applying means. An automatic worm assembling device is provided, characterized in that it comprises a rotational force adjusting means.

"Function" The function of the automatic worm assembly device described above is as follows.

When assembling the worm to the worm wheel pre-installed in the gear housing, the rotational force is transmitted by the rotational force generating means to the flexible rotational force applying means, and the tip of the worm shaft is inserted and supported into the worm shaft hole of the gear housing. When the rotational force applying means makes elastic contact with the outer periphery and applies a rotational force, the worm shaft rotates and automatically assembles the worm and the worm wheel.At this time, the rotational force applied by the rotational force applying means is Adjustment is made by the adjusting means so that when the teeth of both the worm and the worm wheel interfere and the rotational force necessary to rotate the worm shaft becomes excessive, the rotational force applying means slips on the outside of the worm shaft. This prevents forced assembly of the worm and worm wheel.

``Example'' An example of the present invention will be described based on the attached drawings in the case of Mr. B who assembles a rotor with a worm to a gear housing. FIG. 1 is a longitudinal sectional front view showing the configuration of the device of this embodiment.

The gear housing 2 with the worm wheel 1 mounted thereon is fixed to a parts conveying pallet or the like (not shown) with the axis of the worm shaft hole 3 being perpendicular.

A bearing metal 4,
5 is fitted. 6 is a rotor with a worm,
Consisting of a worm 6a, a worm shaft portion 6b, and a rotor 6c, the worm shaft hole 3 of the gear housing 2 is inserted until the tip of the worm 6a contacts the teeth of the worm wheel 1.
Temporarily insert into.

The gear housing 2 and the rotor 6 with a worm may be transported to the position A for assembly in this state, or the rotor 6 with a worm may be temporarily inserted at the position A for assembly.

Reference numeral 1111 designates frames that are installed on both the left and right sides of position A, and air cylinders 1212 are fixed to each frame in a facing manner. Then, each piston rod 1313 is made to protrude toward the assembly position side. Pulley holders 15.15 are attached to the tips of the piston rods 13, 13 via joints 14.14 for position adjustment. Pulley holder 15.
15 are each provided with a pair of guide bars 16.16 to guide the horizontal movement of the pulley holder 15.15 by the linear guides 17.17 of the frame 11.11. The above configuration forms the rotational force adjusting means of the present invention.

The pulley holder 15.15 has a pulley drive shaft 21.21.
and pulley driven shafts 22, 22 are rotatably supported, and a pulley 23 is fitted to each of the protruding lower ends. Then, a flexible endless belt 24, 24 with an O-shaped cross section is attached to each pulley 2.
A hook is passed between 3 and 23 (see FIG. 2).The above structure forms the flexible rotational force applying means of the present invention.

Reference numeral 31 denotes a support frame disposed above the assembly point HA, on which a drive motor 32 is installed and its output shaft 3 is mounted.
3, fit the gear 34 into the gear 34. Furthermore, a gear shaft 35.35 is rotatably supported on the support frame 31 at symmetrical positions on both the left and right sides of the gear 34, and a gear 36 is meshed with the gear shaft 35.35 and driven to rotate in opposite directions. .3
6. A universal joint 37 with a joint slide is connected between the lower end protrusion of the gear shaft 35.35 and the upper end protrusion of the pulley drive shaft 21.21.
．． Connected by 37. The rotational force generating means of the present invention is formed by one arrangement.

The apparatus of this embodiment has the above-mentioned structure, and its operation will be explained below.

When the gear housing 2, in which the worm 6a at the tip of the rotor with worm 6 and the worm shaft portion 6b are temporarily inserted into the worm shaft hole 3, is positioned at a predetermined assembly position IA,
Air cylinder 12.12 fixed to frame 11.11
is driven, the piston rods 13, 13 advance, the pulley holders 15.15 are guided by the linear guides 17, 17, and the assembly moves forward toward position A. On the other hand, on the pulley drive shaft 21.21 of the pulley holder 15.15,
The rotation of the drive motor 32 is transmitted via a universal joint 37.37 with a joint slide, and the rotation of the drive motor 32 is transmitted to the pulley 2.
Flexible endless belts 24 and 24, each having an O-shaped cross section, run in opposite directions. As the pulley holder 15.15 advances, the endless belt 24.24 elastically slides into contact with the outer circumferential portion of the rotor 6C of the rotor 6 with a worm, and rotational force is applied to the rotor 6 with the worm.
is rotated in the meshing direction within the worm shaft hole 3. By adjusting the degree of advance of the pulley holder 15.15, the running endless belt 24.24 is bent and the rotor 6C
The contact angle θ with respect to the outer periphery changes, and the applied rotation is adjusted.

At this time, if the teeth of both the worm wheel 1 and the worm 6a do not interfere with each other as shown in FIG. The worm 6a is engaged, the worm 6a is screwed into the worm shaft hole 3, and is supported by the bearing metals 4 and 5, completing automatic assembly of the worm and the worm wheel.

On the other hand, as shown in FIG. 3(b), if both teeth are causing interference, the endless belt 24°24 will slip around the outer circumference of the rotor 6C, causing the rotor 6c to When this state of slipping, in which rotation is not possible, continues for a certain period of time, the drive motor 32 is stopped or driven to rotate in reverse, and the pulley holder 1515 is once retreated, and then
The meshing of the teeth between the worm wheel 1 and the worm 6a is changed, and the pulley holder 15.15 is advanced again.

The degree of interference between the teeth of both the worm wheel 1 and the worm 6a varies, so adjust the contact angle θ of the endless belt 24, 24 that slides on the outer periphery of the rotor 6C, and if the degree of interference is large, the rotation To prevent a worm 6a from being forcibly rotated even if force is applied. This adjustment is performed by changing the length of the joint 14.14 that connects the piston rod 1313 and the pulley holder 15.15 to adjust the advanced position of the pulley holder 15.15.

In the case of the above embodiment, since the flexible endless belts 24, 24 are used as the rotational force applying means, there is no risk of damaging the rotor 6C around which the coils are wound.
By adjusting the contact angle θ so that the endless belt 24, 24 slips and exerts the action of a torque limiter, when the teeth of the worm wheel 1 and the teeth of the worm wheel 1 interfere greatly and become unable to engage with each other. It is possible to prevent inconveniences such as damage to tooth surfaces due to forced engagement.

"Other Embodiments" FIG. 4 shows another embodiment of the present invention, in which the rotating force applying means is made of an elastic material such as rubber instead of the flexible endless belt 24, 24. Disks 44.44 can also be used. In this case as well, the applied rotational force can be adjusted by adjusting the contact angle θ' of the rotating disks 44, 44 with respect to the rotor 6c. In the above case, the number of parts can be reduced and the configuration of the entire device can be simplified.

"Effects of the Invention" The present invention has the above configuration, and the flexible rotational force applying means elastically contacts and applies the rotational force to the worm, thereby continuously and automatically assembling the worm and the worm wheel. can be done. The rotational force is adjusted by a rotational force adjustment means, and when the teeth of both the worm and the worm wheel interfere and the rotational force required to rotate the worm shaft becomes excessive, the rotational force applying means adjusts the rotational force of the worm shaft. It has excellent effects such as being able to prevent forced assembly by causing slippage on the outside.

[Brief explanation of drawings]

Attached drawings Fig. 1 is a longitudinal sectional front view showing the configuration of an apparatus according to an embodiment of the present invention, Fig. 2 is an enlarged view taken along the line ■-■ in Fig. 1, and Figs. 3 (a) and (b) are An explanatory diagram showing the degree of interference between the teeth of both the worm and the worm wheel, and FIG. 4 is a cross-sectional view of another embodiment. 111. Worm wheel, 290. gear housing, 31. , worm shaft hole, 691. Rotor with worm, 6a, Worm, 6b, Worm shaft, 6c, Rotor, 11 11. ,,Frame, 12゜12,,,Air cylinder, 14,14
．． ,, joint, 15,15. ,,pulley holder,
23. ,,Pulley, 24,24. ,,endless belt,
31., support frame, 32. ,, drive motor, 36,36. ,, Gears, 37. Universal joint with 37 joint slide. Diagram

Claims (1)

[Claims] A worm wheel is attached to the gear housing, and a flexible rotational force applying means elastically contacts and applies rotational force to the outer periphery of the worm shaft, the tip of which is inserted and supported in a worm shaft hole formed in the gear housing; An automatic worm assembling device comprising: a rotational force generating means for generating a rotational force in the rotational force applying means; and a rotational force adjusting means for adjusting the rotational force applied by the rotational force applying means.