JPH11267932A - Automatic assembling device of worm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously and automatically perform the assembling work of a worm to a worm wheel by providing a rotating force imparting means which makes contact with a rotor to impart a rotating force to a worm shaft. SOLUTION: When endless belts 24, 24 are elastically slid to the circumferential part of the rotor 6c of a rotor with worm 6 by the advance of pulley holders 15, 15, a rotating force is imparted to rotate the rotor with worm 6 in gearing direction within a worm shaft hole 3. When both teeth of a worm wheel 1 and the worm 6a are not interfered, the worm wheel 1 and the worm 6a are smoothly geared by the rotation of the rotor with worm 6, and the worm 6a is screwed into the worm shaft hole 3 and supported by bearing metals 4, 5, whereby the automatic assembling of the worm 6a to the worm wheel 1 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic worm assembling apparatus.

[0002]

2. Description of the Related Art When a worm is mounted on a gear housing on which a worm wheel is mounted, a method of assembling the worm by holding the worm shaft and forcibly rotating the worm to engage both teeth of the worm and the worm wheel. There is.

[0003]

However, in the above-mentioned method, since the phasing of both the worm and the worm wheel is not performed, when the worm is forcibly rotated, both teeth interfere with each other and the tooth surface is damaged. May occur. Further, if there is a difference in hardness between the worm and the worm wheel, the flaws generated on the tooth surface become more severe, and not only abnormal noise and vibration are generated, but also rotational force cannot be transmitted smoothly.

Therefore, conventionally, in order to prevent interference between the teeth of the worm and the worm wheel, when the gears are mounted on the gear housing, the phases of the worm teeth and the worm wheel are manually adjusted while adjusting the phases. , The workability was poor and inefficient. The present invention has been made in order to solve the above problems, and provides an automatic worm assembling apparatus that can automatically assemble a worm wheel by adjusting a rotational force applied to a worm shaft. It is intended to do so.

[0005]

According to the first aspect of the present invention, a worm wheel is mounted on a gear housing and is inserted into a worm shaft hole formed in the gear housing while rotating a worm shaft of a rotor. In an automatic worm assembling device, the worm shaft is meshed with the worm wheel and assembled to the gear housing.
A rotating force applying unit that applies a rotating force to the worm shaft in contact with the rotor, a rotating force generating unit that generates a rotating force to the rotating force applying unit, and adjusts a contact state with the rotor. The rotational force adjusting means for adjusting the rotational force applied by the rotational force applying means, and the rotational force generating means is driven to rotate forward until a predetermined slippage occurs between the rotor and the rotational force applying means. Assembly continuation means for continuing assembly by
When the predetermined slippage occurs between the rotor and the rotational force applying means, an assembly stopping means for stopping or reversely driving the rotational force generating means; and Means for releasing the contact state of the rotor by the means, changing the meshing of the teeth of the worm wheel and the worm shaft, and bringing the rotator into contact with the rotor again to return the rotating force applying means to the rotating force applying and returning means. An automatic assembling device for a worm is provided.

Further, in the present invention, the rotational force applying means applies the rotational force to the worm shaft by contacting the rotor from both sides in a direction orthogonal to the axial direction of the rotor. A worm automatic assembling device is provided.

[0007]

According to the first aspect of the invention, when the worm wheel and the worm shaft interfere with each other, the worm wheel and the worm shaft are forcibly assembled due to slippage generated between the rotor and the rotating force applying means. To prevent them from being
Further, when the rotational force generating means is stopped or reversely driven, the meshing state (interference state) between the worm wheel and the worm shaft is changed to reassemble the worm wheel and the worm shaft, which avoid damage to the tooth surface. It becomes possible to attach.

According to the second aspect of the present invention, the worm and the worm wheel are assembled while the rotor is transported (forwarded) in one direction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings, in which a rotor with a worm is mounted on a gear housing. FIG. 1 is a longitudinal sectional drawing showing the configuration of the present embodiment. The gear housing 2 on which the worm wheel 1 is mounted is fixed to a component transfer pallet or the like (not shown) with the axis of the worm shaft hole 3 being vertical.
Bearing metals 4 and 5 are fitted to the rear end and the entrance end of the worm shaft hole 3.

Reference numeral 6 denotes a worm-equipped rotor, which comprises a worm 6a, a worm shaft portion 6b, and a rotor 6c. Temporarily insert into hole 3. In this state, the gear housing 2 and the rotor 6 with worm may be transported to the assembly position A, or the rotor 6 with worm may be temporarily inserted at the assembly position A.

Numerals 11 and 11 denote frames standing on both right and left sides of an assembling position A, respectively.
12 are fixed to face each other. And each piston rod 1
3 and 13 are protruded toward the assembly position. At the distal ends of the piston rods 13, 13, joints 14 for position adjustment,
The pulley holders 15, 15 are mounted via 14.
The pulley holders 15, 15 are provided with a pair of guide bars 16, 16, respectively, and guide the horizontal movement of the pulley holders 15, 15 by the linear motion guides 17, 17 of the frames 11, 11. With the above configuration, the torque adjusting means of the present invention is formed.

The pulley holders 15, 15 support the pulley drive shafts 21, 21 and the pulley driven shafts 22, 22 in a freely rotatable manner, and the pulleys 23 are respectively fitted to the lower ends of the protrusions. And a flexible endless belt 24 having an O-shaped cross section.
Between the pulleys 23, 23 (see FIG. 2). With the above configuration, the flexible rotational force applying means of the present invention is formed.

At this time, as shown in FIG. 2, the rotational force applying means comes into contact with the rotor 6c from both sides in a direction perpendicular to the axial direction of the rotor 6c, and applies a rotational force to the worm shaft portion 6b. . Reference numeral 31 denotes a support frame disposed above the mounting position A, on which a drive motor 32 is installed on the upper surface, and a gear 34 is fitted to an output shaft 33 thereof. Further, the support frame 31 rotatably supports the gear shafts 35, 35 at symmetrical positions on both left and right sides of the gear 34, and the gear shafts 35, 35
The gears 36, 36 which mesh with the gear 34 and are driven to rotate in opposite directions are fitted. Then, the lower end protrusions of the gear shafts 35, 35 and the upper end protrusions of the pulley drive shafts 21, 21 are connected by universal joints 37 with joint slides. With the above configuration, the torque generating means of the present invention is formed.

The automatic worm assembling apparatus according to the present embodiment has the above-described configuration, and its operation will be described below.
When the gear housing 2 is positioned at a predetermined mounting position A in a state where the worm 6a and the worm shaft 6b at the tip of the worm-equipped rotor 6 are temporarily inserted into the worm shaft hole 3,
Air cylinders 12, 12 fixed to frames 11, 11
Is driven, the piston rods 13 advance, and the pulley holders 15, 15 are guided by the linear motion guides 17, 17, and advance toward each other toward the assembly position A. On the other hand, the pulley drive shafts 21 and 21 of the pulley holders 15 and 15 have
The rotation of the drive motor 32 is transmitted through universal joints 37 with joint slides,
The flexible endless belts 24, 24 having an O-shaped cross section stretched between the belts 3, 23 run in opposite directions. When the pulley holders 15, 15 advance, the endless belts 24, 24 elastically slidably contact the outer peripheral portion of the rotor 6c of the worm-equipped rotor 6, a rotational force is applied to the worm-equipped rotor 6,
Is rotated in the meshing direction in the worm shaft hole 3. By adjusting the degree of advance of the pulley holders 15, 15, the running endless belts 24, 24 flex and the rotor 6
The contact angle θ with respect to the outer circumference of c changes, and the applied rotation is adjusted.

At this time, as shown in FIG. 3 (a), when the teeth of both the worm wheel 1 and the worm 6a do not interfere, the rotation of the worm-equipped rotor 6 causes the worm wheel 1 and the worm wheel 1 to rotate. The worm 6a smoothly meshes, and the worm 6a is screwed into the worm shaft hole 3, supported by the bearing metals 4 and 5, and the automatic assembly of the worm and the worm wheel is completed.

On the other hand, as shown in FIG. 3 (b), when both teeth interfere, the endless belt 2
4, 24 slide on the outer periphery of the rotor 6c and cannot rotate the rotor 6c. When this sliding state continues for a certain period of time, the drive motor 32 is stopped or rotated in the reverse direction, and the pulley holders 15, 15 are once retracted, and then the meshing of the teeth of the worm wheel 1 and the worm 6a is changed, and Pulley holder 15, 15
, The rotational force applying and returning means is constituted.

The worm wheel 1 and the worm 6a
Since the degree of interference between the two teeth varies, the contact angle θ between the endless belts 24, 24 slidingly contacting the outer periphery of the rotor 6c is adjusted, and when the degree of interference is large, a rotational force is applied. Also, the worm 6a is prevented from being forcibly rotated. This adjustment is performed by the piston rods 13, 1
3 for connecting pulley holder 3 with pulley holders 15, 15
This is performed by changing the lengths of the pulley holders 4 and 14 and adjusting the advance positions of the pulley holders 15 and 15.

Next, the features of this embodiment will be described. Since the flexible endless belts 24 are used as the rotating force applying means, there is no possibility that the rotor 6c around which the coil is wound is damaged. When the teeth of the worm 6a and the teeth of the worm wheel 1 greatly interfere with each other and the meshing becomes impossible,
By adjusting the contact angle θ so that the endless belts 24, 24 slide and exert the function of the torque limiter,
It is possible to prevent inconvenience such as causing a flaw on the tooth surface due to excessive engagement.

If the rotational force applying and returning means causes interference between the two teeth, the driving motor 32
Is stopped or reversely rotated, and after the pulley holders 15, 15 are once retracted, the meshing of the teeth between the worm wheel 1 and the worm 6a is changed, and the pulley holders 15, 15 are advanced again. No need to work. Therefore, the assembling work of the worm 6a and the worm wheel 1 can be more reliably automated.

The rotating force applying means contacts the rotor 6c from both sides in a direction orthogonal to the axial direction of the rotor 6c and applies a rotating force to the worm shaft portion 6b. While conveying (feeding) in the direction, the worm 6a
And the worm wheel 1 can be assembled. Therefore, the configuration of the production line is simplified, and automation can be further promoted.

(Other Embodiment) FIG. 4 shows a second embodiment of the present invention.
In this embodiment, a rotating disk 44 made of an elastic material such as rubber is used as the rotating force applying means instead of the flexible endless belts 24. In this case, by adjusting the contact angle θ ′ of the rotating disks 44, 44 with the rotor 6c, the worm shaft 6
Adjust the rotational force applied to b.

Accordingly, the number of parts of the automatic worm assembling apparatus can be reduced and the configuration of the entire apparatus can be simplified.

[0023]

According to the present invention, the worm and the worm wheel are continuously and automatically assembled by the rotational force applied to the worm by the flexible rotational force applying means having the above-mentioned structure. Can be done. Further, the rotational force is adjusted by a rotational force adjusting means, and when the rotational force required to rotate the worm shaft due to interference of the teeth of both the worm and the worm wheel becomes excessive, the rotational force applying means adjusts the worm shaft. There is an excellent effect such that an unreasonable assembly can be prevented by causing a slip on the outside.

Further, by changing the meshing state (interference state) between the worm wheel and the worm shaft when the rotating force generating means is stopped or reversely driven, the worm wheel and the worm shaft can avoid damage to the tooth surface. Can be reassembled, eliminating the need to replace the worm wheel and worm shaft due to interference. Further, the contact state of the rotor by the rotational force applying means is released by the rotational force applying and returning means, and the meshing of the teeth between the worm wheel and the worm shaft is changed, and the rotational force is applied again by bringing the worm wheel into contact with the rotor. Since the means is restored, there is no need to perform these operations manually. Therefore, the assembling work of the worm 6a and the worm wheel 1 can be reliably automated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a configuration of an apparatus according to a first embodiment of the present invention.

FIG. 2 is an enlarged view cut along the line II-II in FIG. 1;

FIGS. 3A and 3B are explanatory diagrams showing the degree of interference between teeth of both a worm and a worm wheel.

FIG. 4 is a sectional view of another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Worm wheel, 2 ... Gear housing, 3 ... Worm shaft hole, 6 ... Rotor with worm, 6a ... Worm, 6
b: Worm shaft part, 6c: Rotor, 11, 11: Frame, 12, 12: Air cylinder, 14, 14: Joint, 15, 15: Pulley holder, 23: Pulley, 2
4, 24 endless belt, 31 support frame, 32 drive motor, 36, 36 gear, 37, 37 universal joint with slide.

Claims (2)

[Claims] A worm wheel is mounted on a gear housing, and a worm shaft of a rotor is inserted into a worm shaft hole formed in the gear housing while rotating, and the worm shaft is engaged with the worm wheel. An automatic assembling device for a worm to be assembled to a gear housing, comprising: a rotating force applying unit that applies a rotating force to the worm shaft by contacting the rotor; and a rotating force generating unit that generates a rotating force to the rotating force applying unit. Means, a rotational force adjusting means for adjusting a contact state with the rotor and adjusting a rotational force applied by the rotational force applying means, and a predetermined slippage between the rotor and the rotational force applying means. Until the rotation occurs, the rotation force generation means is driven to rotate forward to continue the assembly, and the predetermined slippage occurs between the rotor and the rotation force applying means. And an assembly stopping means for stopping or reversely driving the rotating force generating means; and releasing the contact state of the rotor by the rotating force applying means together with the assembly stopping means, so that the worm wheel and the worm A worm automatic assembling device, comprising: a rotational force applying / returning means for changing the meshing of a tooth with a shaft and bringing the rotating force applying means back into contact with the rotor again. 2. The automatic worm assembly according to claim 1, wherein the rotational force applying means contacts the rotor from both sides in a direction perpendicular to the axial direction of the rotor to apply a rotational force to the worm shaft. Attachment device.