JPH0619112Y2 - Rotor support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a predetermined clearance between the substrate and the rotating wheel to facilitate the rotation of the rotating wheel at all times.
In addition, the present invention relates to a rotary wheel support device that can be easily assembled.

[Problems to be Solved by Conventional Techniques and Inventions] As is well known, a rotating wheel such as a gear train used in a timepiece or the like is supported by a pair of substrates, for example, a lower substrate and an upper substrate. Many.

Referring to FIG. 2 of this conventional technique, a bearing hole 1a is formed in a lower substrate 1, while a bearing hole 1a is formed in an upper substrate 2 arranged in parallel with the lower substrate 1. A bearing portion 3 having a corresponding bearing hole 3a is formed.

The upper end 5a and the lower end 5b of the shaft 5 provided on the rotating wheel 4 such as a gear are inserted into the bearing holes 1a and 3a, respectively, so that the rotating wheel 4 is supported. . In addition, between the bearing holes 1a and 3a and the upper end portion 5a and the lower end portion 5b of the shaft 5, friction is generated on the shaft 5 of the rotating wheel 4 so as not to force rotation. Gaps are formed.

However, when the support device for a rotating vehicle having such a structure is assembled on a line, for example, the lower end portion 5b of the shaft 5 is inserted into the bearing hole 1a of the lower substrate 1 which is conveyed by the conveying device.
When the shaft is inserted, the shaft 5 is tilted by the amount of the gap, and the engagement position between the insertion hole 3a of the upper substrate 2 and the upper end 5a of the shaft 5 to be placed next is displaced. Engagement is often difficult. In particular, when the shaft 5 is long, the displacement of the engagement position due to the inclination becomes large and the engagement becomes more difficult.

To deal with this, for example, the technique shown in FIG. 3 is generally implemented.

That is, the bearing hole 1a of the lower substrate 1 is eliminated and the bearing hole 1a
A pin 6 projecting toward the upper substrate 2 is provided in the portion where a was formed, while a pin hole 5c corresponding to this pin 6 is formed in the lower portion of the shaft 5. That is, in the rotating wheel 4, the pin 6 is inserted into the pin hole 5c formed in the lower portion of the shaft 5, while the upper end 5a of the shaft 5 is inserted.
Is rotatably supported by being inserted into the bearing hole 3a of the upper substrate 2.

Further, Japanese Utility Model Laid-Open No. 52-115250 discloses a synthetic resin timepiece substrate in which a central shaft (shaft) standing upright in the direction of the upper substrate is integrally formed with the lower substrate. That is, in the rotating wheel, the central axis (shaft) is inserted into the through hole formed in the center of the rotating wheel, while the upper end of the central axis protruding from the rotating wheel is inserted into the bearing hole of the upper substrate. It is rotatably supported by.

According to these techniques, the shaft 5 and the actual open shaft 5 shown in FIG.
The central axis (shaft) shown in the 2-115250 publication
Since the inclination is prevented, the engagement with the upper substrate is facilitated, the assembling workability can be dramatically improved, and a rotating wheel that stably rotates can be obtained.

However, if any load is applied to the upper substrate after the above-mentioned assembly, first, since the bearing hole 3a formed in the upper substrate 2 is a through hole in the support device for the rotating wheel of FIG. By moving to the substrate side, the clearance between the bearing portion 3 and the rotating wheel 4 cannot be secured, the bearing portion 3 and the rotating wheel 4 come into contact with each other, and the bearing portion 3 and the rotating wheel 4 are separated from each other. Or the frictional force applied between the rotating wheel 4 and the lower substrate 1 increases, and a squeaking noise is generated along with the rotation of the rotating wheel 4, or in the extreme case, the rotation of the rotating wheel 4 occurs. May become difficult.

On the other hand, also in the synthetic resin timepiece substrate shown in Japanese Utility Model Publication No. 52-115250, the bearing hole formed in the upper substrate is a through hole, so that the upper substrate is the same as the above-described bearing support device for the rotating wheel of FIG. It is not possible to reliably secure the clearance between the rotating wheel and friction occurs between the upper substrate and the rotating wheel, or between the rotating wheel and the car settling portion of the lower substrate,
A squeaking noise may be generated along with the rotation of the rotating wheel, or in the extreme case, it may be difficult to rotate the rotating wheel.

Also, in order to form a step portion such as a car settling portion parallel to the flat portion of the lower substrate on a small central axis molded integrally with the lower substrate, sagging due to the influence of gas contained in the resin, etc. Since it is necessary to set the area of the step to a large value in consideration of the above, when the step is formed, the diameter of the central axis (shaft) becomes thin and the strength is insufficient. The central axis (shaft) inserted in the upper board may be broken or bent so that a problem may occur between the upper board and the rotating wheel, or between the rotating wheel and the car rest part of the lower board. The squeaking noise may be generated along with the rotation of the rotating wheel, or the rotation of the rotating wheel may be difficult.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a support device for a rotating vehicle that prevents squeaking noises and rotation failures and is easy to assemble. Has an aim.

[Means and Actions for Solving the Problems] In order to achieve this object, a supporting device for a rotating wheel according to the present invention includes a lower substrate provided with a shaft for rotatably supporting the rotating wheel, and the lower substrate. A supporting device for a rotating wheel, comprising: an upper substrate that is opposed to and supports the tip of the shaft.
A tip end surface of a straight shaft that stands upright from the lower substrate to form a predetermined clearance between the rotating wheel and the upper substrate is in contact with a bottom surface of a bearing portion formed by a blind hole provided in the upper substrate. It is a thing.

With such a configuration, the tip end surface of the straight shaft disposed on the lower substrate is brought into contact with the bottom surface of the bearing portion formed by the blind hole provided on the upper substrate to be assembled, so that the bearing is always provided between the bearing portion and the rotating wheel. A predetermined clearance is formed.

Embodiments of the Invention Embodiments will be described below with reference to the drawings.

FIG. 1 is a side view of a bearing device according to a first embodiment of the present invention.

In this figure, reference numeral 11 is a lower substrate, 12 is an upper substrate, and these lower substrate 11 and upper substrate 12 are arranged in parallel with each other.

A straight shaft 13 projecting toward the upper substrate 12 is integrally formed on the lower substrate 11 so as to stand upright with respect to a plane portion of the lower substrate 11, while a portion of the upper substrate 12 corresponding to the straight shaft 13 is formed. For example, a protruding bearing portion 14 having a bearing hole 14a formed as a blind hole is integrally formed therewith.

A bottom surface 16 having a relief portion 16a is formed in the inner portion of the bearing hole 14a. Then, the tip end of the straight shaft 13 is inserted into the bearing hole 14a, and
The tip surface 13a of the straight shaft 13 is brought into contact with the bottom surface 16 so that the distance between the lower substrate 11 and the upper substrate 12 is kept constant. A gear 17 made of, for example, a synthetic resin, which is an example of a rotating wheel, is rotatably mounted on the exposed portion between the bearing portion 14 and the lower substrate 11. That is, the gear 17 is supported by inserting the straight shaft 13 into the hole 15 formed in the shaft center of the gear 17.

The gear 17 is composed of a relatively thin large gear 17a arranged on the bearing portion 14 side and a small gear 17b formed relatively long in the axial direction. The large gear 17a and the small gear 17b are , Are engaged with other gears (not shown).

The length of the gear 17 in the axial direction is shorter than the length of the exposed portion of the straight shaft 13, and is predetermined to eliminate a factor between the bearing portion 14 and the gear 17 that hinders the rotation of the rotating wheel. Clearance 18 is formed.

In addition, the lower end surface 17c of the small gear 17b is formed by the gear 1
Only the weight of 7 makes contact with the lower substrate 11. A predetermined clearance 17d is provided on the lower end surface 17c to reduce the frictional resistance by reducing the contact area with the lower substrate 11 so that the gear 17 can be rotated more easily. ing.

Next, the operation of the embodiment having the above configuration will be described.

First, a procedure for assembling the support device for the rotating wheel on the line will be described. The lower substrate 11 is transported by a transport device (not shown) or the like, and a large gear is attached to the straight shaft 13 formed on the lower substrate 11. The gear 17 in which 17a and the small gear 17b are integrally configured is dropped. Then, the gear 17 descends along the straight shaft 13,
The lower end surface 17c of the small gear 17b comes into contact with the flat surface portion of the lower substrate 11 to stop the lowering of the gear 17.

Next, the bearing portion 1 formed on the upper substrate 12 is formed on the upper end portion of the straight shaft 13 protruding from the gear 17.
No. 4 bearing hole 14a is engaged and the straight shaft 13
The position of the lower substrate 11 and the upper substrate 12 is determined by abutting the tip end surface 13a of the shaft 13 and the bottom surface 16 of the bearing portion 14, and the gear 17 is connected to the straight shaft 13
The small gear 17b is supported by the lower end surface 17c whose area is reduced.

At this time, the large gear 17a of the gear 17 and the bearing 1
While a predetermined clearance 18 is formed between the gear 17 and the gear 4, the gear 17 is only in contact with the flat surface portion of the lower substrate 11 with the contact area of the lower end surface 17c which is reduced. The friction between the gear 17 and the lower substrate 11 is small, and the gear 17 can easily rotate about the straight shaft 13.

Further, by assembling the support device for the rotating wheel as described above, even if some load is applied to the upper substrate 12, the bearing hole 1 of the bearing portion 14 formed in the upper substrate 12
Since 4a is a blind hole, the tip surface of the shaft and the bearing hole 14
The state in which the bottom surface 16 of a is in contact with the upper substrate 12 is held by the straight shaft 13 having a large diameter and high strength, and the upper substrate 12 and The clearance with the rotating car is always kept constant.

As described above, some load was applied to the upper substrate by assembling the support device for the rotating wheel by bringing the tip end surface of the straight shaft provided on the lower substrate into contact with the bottom surface of the bearing hole of the bearing portion formed on the upper substrate. Even in this case, since the upper substrate is held without moving to the lower substrate side, the clearance between the bearing portion and the rotating wheel is not narrowed, and a constant clearance is always maintained, so that the bearing portion and the rotating wheel are not separated from each other. It is possible to eliminate the squeaking noise and the defects of the rotating wheel due to the friction generated between them.

Also, by forming the shaft straight,
Since the strength of the shaft is increased and the gear can be prevented from being caught when the gear is inserted into the shaft, workability can be improved.

In addition, the bottom of the bearing hole is provided with a relief so that the shaft tip and the bottom of the bearing hole will be securely in contact with each other even if burrs occur around the tip of the integrally molded shaft. Since the contact is ensured, the life of the mold for molding the lower substrate can be extended.

It should be noted that, in the present embodiment, an example in which the gear, which is an example of the rotating wheel, is configured to be supported between the lower substrate and the upper substrate, or the bearing device according to the present invention should not be limited to this. Instead, for example, the rotating wheel may be supported between a pair of upright substrates.

In addition, although the example in which the bearing portion is formed so as to project from the upper substrate has been described in the present embodiment, the bearing portion may be formed by another structure such as being formed in the same plane as the plane of the plate. Is also possible.

Furthermore, the shaft may be formed in another structure such as being implanted in the lower substrate.

[Advantages of the Invention] As described above, in the support device for a rotating wheel according to the present invention, the generation of squeaking noise and the occurrence of rotation failure are prevented, and the assembling is facilitated.

[Brief description of drawings]

FIG. 1 is a side view of a bearing device showing a first embodiment of the present invention,
FIG. 2 is a side view of a bearing device according to a conventional technique, and FIG. 3 is a side view of a bearing device according to another conventional technique. 11 ... Lower substrate 12 ... Upper substrate 13 ... Shaft 13a ... Tip surface 14 ... Bearing part 16 ... Bottom surface 17 ... Rotating wheel (gear) 18 ... Clearance

Claims (1)

[Scope of utility model registration request] 1. A supporting device for a rotating wheel, comprising: a lower substrate provided with a shaft for rotatably supporting a rotating wheel; and an upper substrate opposite to the lower substrate for supporting a tip portion of the shaft. A tip end surface of a straight shaft that stands upright from the lower substrate to form a predetermined clearance between the rotating wheel and the upper substrate is in contact with a bottom surface of a bearing portion formed by a blind hole provided in the upper substrate. A supporting device for a rotating car, which is characterized in that